blob: b0142e01002e3dd4fc3299f23da6ce2e6aaa3997 [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001# SPDX-License-Identifier: GPL-2.0
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +01002# Select 32 or 64 bit
3config 64BIT
Masahiro Yamada104daea2018-05-28 18:21:40 +09004 bool "64-bit kernel" if "$(ARCH)" = "x86"
5 default "$(ARCH)" != "i386"
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09006 help
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +01007 Say yes to build a 64-bit kernel - formerly known as x86_64
8 Say no to build a 32-bit kernel - formerly known as i386
9
10config X86_32
Jan Beulich3120e252012-09-10 12:41:45 +010011 def_bool y
12 depends on !64BIT
Ingo Molnar341c7872016-11-15 10:04:55 +010013 # Options that are inherently 32-bit kernel only:
14 select ARCH_WANT_IPC_PARSE_VERSION
15 select CLKSRC_I8253
16 select CLONE_BACKWARDS
Thomas Gleixner157e1182020-11-03 10:27:20 +010017 select GENERIC_VDSO_32
Thomas Gleixner117ed452019-04-14 18:00:08 +020018 select HAVE_DEBUG_STACKOVERFLOW
Thomas Gleixner157e1182020-11-03 10:27:20 +010019 select KMAP_LOCAL
Ingo Molnar341c7872016-11-15 10:04:55 +010020 select MODULES_USE_ELF_REL
21 select OLD_SIGACTION
Brian Gerst2ca408d2020-11-30 17:30:59 -050022 select ARCH_SPLIT_ARG64
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +010023
24config X86_64
Jan Beulich3120e252012-09-10 12:41:45 +010025 def_bool y
26 depends on 64BIT
Ingo Molnard94e0682016-11-15 10:11:57 +010027 # Options that are inherently 64-bit kernel only:
Alexandre Ghiti4eb07162019-05-13 17:19:04 -070028 select ARCH_HAS_GIGANTIC_PAGE
Ard Biesheuvelc12d3362019-11-08 13:22:27 +010029 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128
Ingo Molnard94e0682016-11-15 10:11:57 +010030 select ARCH_USE_CMPXCHG_LOCKREF
31 select HAVE_ARCH_SOFT_DIRTY
32 select MODULES_USE_ELF_RELA
Christoph Hellwigf616ab52018-05-09 06:53:49 +020033 select NEED_DMA_MAP_STATE
Christoph Hellwig09230cb2018-04-24 09:00:54 +020034 select SWIOTLB
Al Viro7facdc42020-06-13 23:03:25 -040035 select ARCH_HAS_ELFCORE_COMPAT
Kefeng Wang63703f32021-06-30 18:52:20 -070036 select ZONE_DMA32
Sam Ravnborg1032c0b2007-11-06 21:35:08 +010037
Steven Rostedt (VMware)518049d2019-05-10 12:05:46 -040038config FORCE_DYNAMIC_FTRACE
39 def_bool y
40 depends on X86_32
41 depends on FUNCTION_TRACER
42 select DYNAMIC_FTRACE
43 help
44 We keep the static function tracing (!DYNAMIC_FTRACE) around
45 in order to test the non static function tracing in the
46 generic code, as other architectures still use it. But we
47 only need to keep it around for x86_64. No need to keep it
48 for x86_32. For x86_32, force DYNAMIC_FTRACE.
Ingo Molnard94e0682016-11-15 10:11:57 +010049#
50# Arch settings
51#
52# ( Note that options that are marked 'if X86_64' could in principle be
53# ported to 32-bit as well. )
54#
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010055config X86
Harvey Harrison3c2362e2008-01-30 13:31:03 +010056 def_bool y
Ingo Molnarc763ea22016-11-15 10:26:39 +010057 #
58 # Note: keep this list sorted alphabetically
59 #
Ingo Molnar6471b822015-06-03 10:00:13 +020060 select ACPI_LEGACY_TABLES_LOOKUP if ACPI
61 select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
Yury Norov942fa982018-05-16 11:18:49 +030062 select ARCH_32BIT_OFF_T if X86_32
Thomas Gleixner2a21ad52018-09-17 14:45:35 +020063 select ARCH_CLOCKSOURCE_INIT
Masami Hiramatsu1f6d3a82021-10-25 20:41:52 +090064 select ARCH_CORRECT_STACKTRACE_ON_KRETPROBE
Anshuman Khandual1e866972021-05-04 18:38:21 -070065 select ARCH_ENABLE_HUGEPAGE_MIGRATION if X86_64 && HUGETLB_PAGE && MIGRATION
David Hildenbrand5c11f00b2021-11-05 13:44:39 -070066 select ARCH_ENABLE_MEMORY_HOTPLUG if X86_64
Anshuman Khandual91024b32021-05-04 18:38:17 -070067 select ARCH_ENABLE_MEMORY_HOTREMOVE if MEMORY_HOTPLUG
Anshuman Khandualcebc7742021-06-30 18:51:58 -070068 select ARCH_ENABLE_SPLIT_PMD_PTLOCK if (PGTABLE_LEVELS > 2) && (X86_64 || X86_PAE)
Anshuman Khandual1e866972021-05-04 18:38:21 -070069 select ARCH_ENABLE_THP_MIGRATION if X86_64 && TRANSPARENT_HUGEPAGE
Ingo Molnarc763ea22016-11-15 10:26:39 +010070 select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
Anshuman Khandualc2280be2021-05-04 18:38:09 -070071 select ARCH_HAS_CACHE_LINE_SIZE
Kees Cook2792d842022-02-16 12:05:28 -080072 select ARCH_HAS_CURRENT_STACK_POINTER
Laura Abbottfa5b6ec2017-01-10 13:35:40 -080073 select ARCH_HAS_DEBUG_VIRTUAL
Anshuman Khandual399145f2020-06-04 16:47:15 -070074 select ARCH_HAS_DEBUG_VM_PGTABLE if !X86_PAE
Dan Williams21266be2015-11-19 18:19:29 -080075 select ARCH_HAS_DEVMEM_IS_ALLOWED
Douglas Andersonb1a57bb2020-05-07 13:08:42 -070076 select ARCH_HAS_EARLY_DEBUG if KGDB
Ingo Molnar6471b822015-06-03 10:00:13 +020077 select ARCH_HAS_ELF_RANDOMIZE
Linus Torvalds72d93102014-09-13 11:14:53 -070078 select ARCH_HAS_FAST_MULTIPLIER
Dave Hansen316d0972018-04-20 15:20:28 -070079 select ARCH_HAS_FILTER_PGPROT
Daniel Micay6974f0c2017-07-12 14:36:10 -070080 select ARCH_HAS_FORTIFY_SOURCE
Riku Voipio957e3fa2014-12-12 16:57:44 -080081 select ARCH_HAS_GCOV_PROFILE_ALL
Marco Elverbece04b2022-01-19 18:10:31 -080082 select ARCH_HAS_KCOV if X86_64
Thiago Jung Bauermann0c9c1d52019-08-06 01:49:14 -030083 select ARCH_HAS_MEM_ENCRYPT
Mathieu Desnoyers10bcc802018-01-29 15:20:18 -050084 select ARCH_HAS_MEMBARRIER_SYNC_CORE
Daniel Borkmann0ebeea82020-05-15 12:11:16 +020085 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
Ingo Molnarc763ea22016-11-15 10:26:39 +010086 select ARCH_HAS_PMEM_API if X86_64
Robin Murphy17596732019-07-16 16:30:47 -070087 select ARCH_HAS_PTE_DEVMAP if X86_64
Laurent Dufour3010a5e2018-06-07 17:06:08 -070088 select ARCH_HAS_PTE_SPECIAL
Dan Williams0aed55a2017-05-29 12:22:50 -070089 select ARCH_HAS_UACCESS_FLUSHCACHE if X86_64
Dan Williamsec6347b2020-10-05 20:40:16 -070090 select ARCH_HAS_COPY_MC if X86_64
Daniel Borkmannd2852a22017-02-21 16:09:33 +010091 select ARCH_HAS_SET_MEMORY
Rick Edgecombed253ca02019-04-25 17:11:34 -070092 select ARCH_HAS_SET_DIRECT_MAP
Laura Abbottad21fc42017-02-06 16:31:57 -080093 select ARCH_HAS_STRICT_KERNEL_RWX
94 select ARCH_HAS_STRICT_MODULE_RWX
Mathieu Desnoyersac1ab122018-01-29 15:20:16 -050095 select ARCH_HAS_SYNC_CORE_BEFORE_USERMODE
Brian Gerst25c619e52020-03-13 15:51:42 -040096 select ARCH_HAS_SYSCALL_WRAPPER
Andrey Ryabininc6d30852016-01-20 15:00:55 -080097 select ARCH_HAS_UBSAN_SANITIZE_ALL
Zong Li7e01ccb2020-06-03 16:03:58 -070098 select ARCH_HAS_DEBUG_WX
Kefeng Wang63703f32021-06-30 18:52:20 -070099 select ARCH_HAS_ZONE_DMA_SET if EXPERT
Ingo Molnar6471b822015-06-03 10:00:13 +0200100 select ARCH_HAVE_NMI_SAFE_CMPXCHG
101 select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI
Mark Salter77fbbc82013-10-07 22:18:07 -0400102 select ARCH_MIGHT_HAVE_PC_PARPORT
Mark Salter5e2c18c2014-01-01 11:34:16 -0800103 select ARCH_MIGHT_HAVE_PC_SERIO
Thomas Gleixner3599fe12019-04-25 11:45:22 +0200104 select ARCH_STACKWALK
Arnd Bergmann2c870e62018-07-24 11:48:45 +0200105 select ARCH_SUPPORTS_ACPI
Ingo Molnar6471b822015-06-03 10:00:13 +0200106 select ARCH_SUPPORTS_ATOMIC_RMW
Mike Rapoport5d6ad662020-12-14 19:10:30 -0800107 select ARCH_SUPPORTS_DEBUG_PAGEALLOC
Pasha Tatashind283d422022-01-14 14:06:41 -0800108 select ARCH_SUPPORTS_PAGE_TABLE_CHECK if X86_64
Ingo Molnar6471b822015-06-03 10:00:13 +0200109 select ARCH_SUPPORTS_NUMA_BALANCING if X86_64
Thomas Gleixner14df3262020-11-18 20:48:41 +0100110 select ARCH_SUPPORTS_KMAP_LOCAL_FORCE_MAP if NR_CPUS <= 4096
Nathan Chancellor583bfd42021-04-29 16:26:12 -0700111 select ARCH_SUPPORTS_LTO_CLANG
112 select ARCH_SUPPORTS_LTO_CLANG_THIN
Ingo Molnar6471b822015-06-03 10:00:13 +0200113 select ARCH_USE_BUILTIN_BSWAP
Anshuman Khandualdce44562021-04-29 22:55:15 -0700114 select ARCH_USE_MEMTEST
Ingo Molnar6471b822015-06-03 10:00:13 +0200115 select ARCH_USE_QUEUED_RWLOCKS
116 select ARCH_USE_QUEUED_SPINLOCKS
Mark Brown2ce0d7f2020-04-16 19:24:02 +0100117 select ARCH_USE_SYM_ANNOTATIONS
Andy Lutomirskice4a4e562017-05-28 10:00:14 -0700118 select ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
Daniel Borkmann81c22042019-12-09 16:08:03 +0100119 select ARCH_WANT_DEFAULT_BPF_JIT if X86_64
Ingo Molnarc763ea22016-11-15 10:26:39 +0100120 select ARCH_WANTS_DYNAMIC_TASK_STRUCT
Nick Desaulniers51c2ee62021-06-21 16:18:22 -0700121 select ARCH_WANTS_NO_INSTR
Anshuman Khandual07431502022-03-22 14:45:15 -0700122 select ARCH_WANT_GENERAL_HUGETLB
Alexandre Ghiti3876d4a2019-06-27 15:00:11 -0700123 select ARCH_WANT_HUGE_PMD_SHARE
Nathan Chancellor59612b22020-11-19 13:46:56 -0700124 select ARCH_WANT_LD_ORPHAN_WARN
Huang Ying38d8b4e2017-07-06 15:37:18 -0700125 select ARCH_WANTS_THP_SWAP if X86_64
Balbir Singhb5f06f62021-04-26 21:42:30 +0200126 select ARCH_HAS_PARANOID_L1D_FLUSH
Shile Zhang10916702019-12-04 08:46:31 +0800127 select BUILDTIME_TABLE_SORT
Ingo Molnar6471b822015-06-03 10:00:13 +0200128 select CLKEVT_I8253
Ingo Molnar6471b822015-06-03 10:00:13 +0200129 select CLOCKSOURCE_VALIDATE_LAST_CYCLE
130 select CLOCKSOURCE_WATCHDOG
Ingo Molnar6471b822015-06-03 10:00:13 +0200131 select DCACHE_WORD_ACCESS
Thomas Gleixner3aac3eb2021-10-21 15:55:06 -0700132 select DYNAMIC_SIGFRAME
Linus Torvalds45471cd2015-06-24 19:52:06 -0700133 select EDAC_ATOMIC_SCRUB
134 select EDAC_SUPPORT
Ingo Molnar6471b822015-06-03 10:00:13 +0200135 select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC)
136 select GENERIC_CLOCKEVENTS_MIN_ADJUST
137 select GENERIC_CMOS_UPDATE
138 select GENERIC_CPU_AUTOPROBE
Thomas Gleixner61dc0f52018-01-07 22:48:01 +0100139 select GENERIC_CPU_VULNERABILITIES
Ingo Molnar6471b822015-06-03 10:00:13 +0200140 select GENERIC_EARLY_IOREMAP
Thomas Gleixner27d6b4d2020-07-23 00:00:04 +0200141 select GENERIC_ENTRY
Ingo Molnar6471b822015-06-03 10:00:13 +0200142 select GENERIC_IOMAP
Thomas Gleixnerc7d6c9d2017-06-20 01:37:46 +0200143 select GENERIC_IRQ_EFFECTIVE_AFF_MASK if SMP
Thomas Gleixner0fa115d2017-09-13 23:29:38 +0200144 select GENERIC_IRQ_MATRIX_ALLOCATOR if X86_LOCAL_APIC
Thomas Gleixnerad7a9292017-06-20 01:37:33 +0200145 select GENERIC_IRQ_MIGRATION if SMP
Ingo Molnar6471b822015-06-03 10:00:13 +0200146 select GENERIC_IRQ_PROBE
Thomas Gleixnerc201c912017-10-17 09:54:59 +0200147 select GENERIC_IRQ_RESERVATION_MODE
Ingo Molnar6471b822015-06-03 10:00:13 +0200148 select GENERIC_IRQ_SHOW
149 select GENERIC_PENDING_IRQ if SMP
Steven Price2ae27132020-02-03 17:36:24 -0800150 select GENERIC_PTDUMP
Ingo Molnar6471b822015-06-03 10:00:13 +0200151 select GENERIC_SMP_IDLE_THREAD
Ingo Molnar6471b822015-06-03 10:00:13 +0200152 select GENERIC_TIME_VSYSCALL
Vincenzo Frascino7ac87072019-06-21 10:52:49 +0100153 select GENERIC_GETTIMEOFDAY
Dmitry Safonov550a77a2019-11-12 01:27:11 +0000154 select GENERIC_VDSO_TIME_NS
Christoph Hellwig39656e82019-07-11 20:56:49 -0700155 select GUP_GET_PTE_LOW_HIGH if X86_PAE
Hans de Goede17e58882020-01-23 22:02:42 +0100156 select HARDIRQS_SW_RESEND
Thomas Gleixner7edaeb62017-08-15 09:50:13 +0200157 select HARDLOCKUP_CHECK_TIMESTAMP if X86_64
Ingo Molnar6471b822015-06-03 10:00:13 +0200158 select HAVE_ACPI_APEI if ACPI
159 select HAVE_ACPI_APEI_NMI if ACPI
160 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
Ingo Molnar6471b822015-06-03 10:00:13 +0200161 select HAVE_ARCH_AUDITSYSCALL
162 select HAVE_ARCH_HUGE_VMAP if X86_64 || X86_PAE
Song Liueed1fce2022-03-02 09:51:25 -0800163 select HAVE_ARCH_HUGE_VMALLOC if X86_64
Ingo Molnar6471b822015-06-03 10:00:13 +0200164 select HAVE_ARCH_JUMP_LABEL
Ard Biesheuvelb34006c2018-09-18 23:51:41 -0700165 select HAVE_ARCH_JUMP_LABEL_RELATIVE
Andrey Ryabinind17a1d92017-11-15 17:36:35 -0800166 select HAVE_ARCH_KASAN if X86_64
Daniel Axtens0609ae02019-11-30 17:55:00 -0800167 select HAVE_ARCH_KASAN_VMALLOC if X86_64
Alexander Potapenko1dc0da62021-02-25 17:18:57 -0800168 select HAVE_ARCH_KFENCE
Ingo Molnar6471b822015-06-03 10:00:13 +0200169 select HAVE_ARCH_KGDB
Daniel Cashman9e08f572016-01-14 15:20:06 -0800170 select HAVE_ARCH_MMAP_RND_BITS if MMU
171 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if MMU && COMPAT
Dmitry Safonov1b028f72017-03-06 17:17:19 +0300172 select HAVE_ARCH_COMPAT_MMAP_BASES if MMU && COMPAT
Ard Biesheuvel271ca782018-08-21 21:56:00 -0700173 select HAVE_ARCH_PREL32_RELOCATIONS
Ingo Molnar6471b822015-06-03 10:00:13 +0200174 select HAVE_ARCH_SECCOMP_FILTER
Kees Cookf7d83c12017-08-16 13:26:03 -0700175 select HAVE_ARCH_THREAD_STRUCT_WHITELIST
Alexander Popovafaef012018-08-17 01:16:58 +0300176 select HAVE_ARCH_STACKLEAK
Ingo Molnar6471b822015-06-03 10:00:13 +0200177 select HAVE_ARCH_TRACEHOOK
178 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
Matthew Wilcoxa00cc7d2017-02-24 14:57:02 -0800179 select HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD if X86_64
Peter Xub64d8d12020-04-20 18:13:45 -0700180 select HAVE_ARCH_USERFAULTFD_WP if X86_64 && USERFAULTFD
Axel Rasmussen7677f7f2021-05-04 18:35:36 -0700181 select HAVE_ARCH_USERFAULTFD_MINOR if X86_64 && USERFAULTFD
Andy Lutomirskie37e43a2016-08-11 02:35:23 -0700182 select HAVE_ARCH_VMAP_STACK if X86_64
Kees Cookfe950f62021-04-01 16:23:45 -0700183 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
Ingo Molnarc763ea22016-11-15 10:26:39 +0100184 select HAVE_ARCH_WITHIN_STACK_FRAMES
Masahiro Yamada2ff2b7e2019-08-19 14:54:20 +0900185 select HAVE_ASM_MODVERSIONS
Ingo Molnar6471b822015-06-03 10:00:13 +0200186 select HAVE_CMPXCHG_DOUBLE
187 select HAVE_CMPXCHG_LOCAL
188 select HAVE_CONTEXT_TRACKING if X86_64
Frederic Weisbeckerd1f250e2020-11-17 16:16:37 +0100189 select HAVE_CONTEXT_TRACKING_OFFSTACK if HAVE_CONTEXT_TRACKING
Ingo Molnar6471b822015-06-03 10:00:13 +0200190 select HAVE_C_RECORDMCOUNT
Sami Tolvanen6dafca92020-08-06 15:15:02 -0700191 select HAVE_OBJTOOL_MCOUNT if STACK_VALIDATION
Steven Rostedt (Google)4ed308c2022-01-25 09:19:10 -0500192 select HAVE_BUILDTIME_MCOUNT_SORT
Ingo Molnar6471b822015-06-03 10:00:13 +0200193 select HAVE_DEBUG_KMEMLEAK
Akinobu Mita9c5a3622014-06-04 16:06:50 -0700194 select HAVE_DMA_CONTIGUOUS
Steven Rostedt677aa9f2008-05-17 00:01:36 -0400195 select HAVE_DYNAMIC_FTRACE
Masami Hiramatsu06aeaae2012-09-28 17:15:17 +0900196 select HAVE_DYNAMIC_FTRACE_WITH_REGS
Steven Rostedt (VMware)02a474c2020-10-27 10:55:55 -0400197 select HAVE_DYNAMIC_FTRACE_WITH_ARGS if X86_64
Steven Rostedt (VMware)562955f2019-11-08 13:11:39 -0500198 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
Heiko Carstensc316eb42021-10-12 15:38:01 +0200199 select HAVE_SAMPLE_FTRACE_DIRECT if X86_64
Heiko Carstens503e4512021-11-15 20:56:13 +0100200 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI if X86_64
Wang YanQing03f57812018-05-03 14:10:43 +0800201 select HAVE_EBPF_JIT
Johannes Berg58340a02008-07-25 01:45:33 -0700202 select HAVE_EFFICIENT_UNALIGNED_ACCESS
Christoph Hellwig6630a8e2018-11-15 20:05:37 +0100203 select HAVE_EISA
Jiri Slaby5f56a5d2016-05-20 17:00:16 -0700204 select HAVE_EXIT_THREAD
Christoph Hellwig67a929e2019-07-11 20:57:14 -0700205 select HAVE_FAST_GUP
Steven Rostedt (VMware)644e0e82017-03-23 10:33:52 -0400206 select HAVE_FENTRY if X86_64 || DYNAMIC_FTRACE
Ingo Molnar6471b822015-06-03 10:00:13 +0200207 select HAVE_FTRACE_MCOUNT_RECORD
Steven Rostedt (VMware)4a30e4c2021-10-20 23:35:55 -0400208 select HAVE_FUNCTION_GRAPH_TRACER if X86_32 || (X86_64 && DYNAMIC_FTRACE)
Ingo Molnar6471b822015-06-03 10:00:13 +0200209 select HAVE_FUNCTION_TRACER
Emese Revfy6b90bd42016-05-24 00:09:38 +0200210 select HAVE_GCC_PLUGINS
K.Prasad0067f122009-06-01 23:43:57 +0530211 select HAVE_HW_BREAKPOINT
Ingo Molnar6471b822015-06-03 10:00:13 +0200212 select HAVE_IOREMAP_PROT
Thomas Gleixner624db9e2021-02-10 00:40:51 +0100213 select HAVE_IRQ_EXIT_ON_IRQ_STACK if X86_64
Ingo Molnar6471b822015-06-03 10:00:13 +0200214 select HAVE_IRQ_TIME_ACCOUNTING
215 select HAVE_KERNEL_BZIP2
216 select HAVE_KERNEL_GZIP
217 select HAVE_KERNEL_LZ4
218 select HAVE_KERNEL_LZMA
219 select HAVE_KERNEL_LZO
220 select HAVE_KERNEL_XZ
Nick Terrellfb46d052020-07-30 12:08:39 -0700221 select HAVE_KERNEL_ZSTD
Ingo Molnar6471b822015-06-03 10:00:13 +0200222 select HAVE_KPROBES
223 select HAVE_KPROBES_ON_FTRACE
Masami Hiramatsu540adea2018-01-13 02:55:03 +0900224 select HAVE_FUNCTION_ERROR_INJECTION
Ingo Molnar6471b822015-06-03 10:00:13 +0200225 select HAVE_KRETPROBES
Masami Hiramatsuf3a112c2022-03-26 11:27:17 +0900226 select HAVE_RETHOOK
Ingo Molnar6471b822015-06-03 10:00:13 +0200227 select HAVE_KVM
228 select HAVE_LIVEPATCH if X86_64
Frederic Weisbecker01027522010-04-11 18:55:56 +0200229 select HAVE_MIXED_BREAKPOINTS_REGS
Josh Poimboeufee9f8fc2017-07-24 18:36:57 -0500230 select HAVE_MOD_ARCH_SPECIFIC
Joel Fernandes (Google)9f132f72019-01-03 15:28:41 -0800231 select HAVE_MOVE_PMD
Kalesh Singhbe37c982020-12-14 19:07:40 -0800232 select HAVE_MOVE_PUD
Petr Mladek42a0bb32016-05-20 17:00:33 -0700233 select HAVE_NMI
Ingo Molnar6471b822015-06-03 10:00:13 +0200234 select HAVE_OPTPROBES
235 select HAVE_PCSPKR_PLATFORM
236 select HAVE_PERF_EVENTS
Frederic Weisbeckerc01d4322010-05-15 22:57:48 +0200237 select HAVE_PERF_EVENTS_NMI
Nicholas Piggin92e5aae2017-08-18 15:15:51 -0700238 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI
Christoph Hellwigeb01d422018-11-15 20:05:32 +0100239 select HAVE_PCI
Jiri Olsac5e63192012-08-07 15:20:36 +0200240 select HAVE_PERF_REGS
Jiri Olsac5ebced2012-08-07 15:20:40 +0200241 select HAVE_PERF_USER_STACK_DUMP
Peter Zijlstraff2e6d722020-02-03 17:37:02 -0800242 select MMU_GATHER_RCU_TABLE_FREE if PARAVIRT
Thomas Gleixner00998082020-07-30 12:14:07 +0200243 select HAVE_POSIX_CPU_TIMERS_TASK_WORK
Ingo Molnar6471b822015-06-03 10:00:13 +0200244 select HAVE_REGS_AND_STACK_ACCESS_API
Jiri Slaby6415b382018-05-18 08:47:13 +0200245 select HAVE_RELIABLE_STACKTRACE if X86_64 && (UNWINDER_FRAME_POINTER || UNWINDER_ORC) && STACK_VALIDATION
Masami Hiramatsu3c88ee194c2018-04-25 21:20:57 +0900246 select HAVE_FUNCTION_ARG_ACCESS_API
Kefeng Wang7ecd19c2022-01-19 18:07:41 -0800247 select HAVE_SETUP_PER_CPU_AREA
Thomas Gleixnercd1a41c2021-02-10 00:40:52 +0100248 select HAVE_SOFTIRQ_ON_OWN_STACK
Masahiro Yamadad148eac2018-06-14 19:36:45 +0900249 select HAVE_STACKPROTECTOR if CC_HAS_SANE_STACKPROTECTOR
Ingo Molnarc763ea22016-11-15 10:26:39 +0100250 select HAVE_STACK_VALIDATION if X86_64
Josh Poimboeufe6d6c072020-08-18 15:57:44 +0200251 select HAVE_STATIC_CALL
Josh Poimboeuf1e7e4782020-08-18 15:57:45 +0200252 select HAVE_STATIC_CALL_INLINE if HAVE_STACK_VALIDATION
Mark Rutland99cf983c2022-02-14 16:52:14 +0000253 select HAVE_PREEMPT_DYNAMIC_CALL
Mathieu Desnoyersd6761b82018-06-02 08:43:58 -0400254 select HAVE_RSEQ
Ingo Molnar6471b822015-06-03 10:00:13 +0200255 select HAVE_SYSCALL_TRACEPOINTS
Ingo Molnar6471b822015-06-03 10:00:13 +0200256 select HAVE_UNSTABLE_SCHED_CLOCK
Avi Kivity7c68af62009-09-19 09:40:22 +0300257 select HAVE_USER_RETURN_NOTIFIER
Vincenzo Frascino7ac87072019-06-21 10:52:49 +0100258 select HAVE_GENERIC_VDSO
Thomas Gleixner05736e42018-05-29 17:48:27 +0200259 select HOTPLUG_SMT if SMP
Thomas Gleixnerc01858082011-02-07 02:24:08 +0100260 select IRQ_FORCED_THREADING
Kefeng Wang7ecd19c2022-01-19 18:07:41 -0800261 select NEED_PER_CPU_EMBED_FIRST_CHUNK
262 select NEED_PER_CPU_PAGE_FIRST_CHUNK
Christoph Hellwig86596f02018-04-05 09:44:52 +0200263 select NEED_SG_DMA_LENGTH
Christoph Hellwig2eac9c22018-11-15 20:05:33 +0100264 select PCI_DOMAINS if PCI
Sinan Kaya625210c2019-01-21 23:19:58 +0000265 select PCI_LOCKLESS_CONFIG if PCI
Ingo Molnar6471b822015-06-03 10:00:13 +0200266 select PERF_EVENTS
Prarit Bhargava3195ef52013-02-14 12:02:54 -0500267 select RTC_LIB
Arnd Bergmannd6faca42016-06-01 16:46:23 +0200268 select RTC_MC146818_LIB
Ingo Molnar6471b822015-06-03 10:00:13 +0200269 select SPARSE_IRQ
Pranith Kumar83fe27e2014-12-05 11:24:45 -0500270 select SRCU
Josh Poimboeuf1e7e4782020-08-18 15:57:45 +0200271 select STACK_VALIDATION if HAVE_STACK_VALIDATION && (HAVE_STATIC_CALL_INLINE || RETPOLINE)
Ingo Molnar6471b822015-06-03 10:00:13 +0200272 select SYSCTL_EXCEPTION_TRACE
Andy Lutomirski15f4eae2016-09-13 14:29:25 -0700273 select THREAD_INFO_IN_TASK
Masahiro Yamada4aae6832021-07-31 14:22:32 +0900274 select TRACE_IRQFLAGS_SUPPORT
Ingo Molnar6471b822015-06-03 10:00:13 +0200275 select USER_STACKTRACE_SUPPORT
276 select VIRT_TO_BUS
Ingo Molnar3b02a052020-04-13 09:44:39 +0200277 select HAVE_ARCH_KCSAN if X86_64
Ingo Molnar6471b822015-06-03 10:00:13 +0200278 select X86_FEATURE_NAMES if PROC_FS
Aubrey Li0c608da2019-06-06 09:22:35 +0800279 select PROC_PID_ARCH_STATUS if PROC_FS
Jarkko Sakkinen50468e42021-11-16 18:21:16 +0200280 select HAVE_ARCH_NODE_DEV_GROUP if X86_SGX
Nayna Jain9e2b4be2020-03-08 20:57:51 -0400281 imply IMA_SECURE_AND_OR_TRUSTED_BOOT if EFI
Balbir Singh7d8330a2008-02-10 12:46:28 +0530282
Ingo Molnarba7e4d12009-06-06 13:58:12 +0200283config INSTRUCTION_DECODER
Jan Beulich3120e252012-09-10 12:41:45 +0100284 def_bool y
285 depends on KPROBES || PERF_EVENTS || UPROBES
Ingo Molnarba7e4d12009-06-06 13:58:12 +0200286
Linus Torvalds51b26ad2009-04-26 10:12:47 -0700287config OUTPUT_FORMAT
288 string
289 default "elf32-i386" if X86_32
290 default "elf64-x86-64" if X86_64
291
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100292config LOCKDEP_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100293 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100294
295config STACKTRACE_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100296 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100297
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100298config MMU
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100299 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100300
Daniel Cashman9e08f572016-01-14 15:20:06 -0800301config ARCH_MMAP_RND_BITS_MIN
302 default 28 if 64BIT
303 default 8
304
305config ARCH_MMAP_RND_BITS_MAX
306 default 32 if 64BIT
307 default 16
308
309config ARCH_MMAP_RND_COMPAT_BITS_MIN
310 default 8
311
312config ARCH_MMAP_RND_COMPAT_BITS_MAX
313 default 16
314
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100315config SBUS
316 bool
317
318config GENERIC_ISA_DMA
Jan Beulich3120e252012-09-10 12:41:45 +0100319 def_bool y
320 depends on ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100321
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100322config GENERIC_BUG
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100323 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100324 depends on BUG
Jan Beulichb93a5312008-12-16 11:40:27 +0000325 select GENERIC_BUG_RELATIVE_POINTERS if X86_64
326
327config GENERIC_BUG_RELATIVE_POINTERS
328 bool
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100329
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100330config ARCH_MAY_HAVE_PC_FDC
Jan Beulich3120e252012-09-10 12:41:45 +0100331 def_bool y
332 depends on ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100333
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100334config GENERIC_CALIBRATE_DELAY
335 def_bool y
336
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800337config ARCH_HAS_CPU_RELAX
338 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100339
Johannes Berg801e4062007-12-08 02:12:39 +0100340config ARCH_HIBERNATION_POSSIBLE
341 def_bool y
Johannes Berg801e4062007-12-08 02:12:39 +0100342
Andy Shevchenkod7109fe2021-08-26 18:03:17 +0300343config ARCH_NR_GPIO
344 int
345 default 1024 if X86_64
346 default 512
347
Johannes Bergf4cb5702007-12-08 02:14:00 +0100348config ARCH_SUSPEND_POSSIBLE
349 def_bool y
Johannes Bergf4cb5702007-12-08 02:14:00 +0100350
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100351config AUDIT_ARCH
Jan Beuliche0fd24a2015-02-05 15:39:34 +0000352 def_bool y if X86_64
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100353
Andrey Ryabinind6f2d752015-07-02 12:09:38 +0300354config KASAN_SHADOW_OFFSET
355 hex
356 depends on KASAN
357 default 0xdffffc0000000000
358
Shane Wang69575d32009-09-01 18:25:07 -0700359config HAVE_INTEL_TXT
360 def_bool y
Kees Cook6ea30382012-10-02 11:16:47 -0700361 depends on INTEL_IOMMU && ACPI
Shane Wang69575d32009-09-01 18:25:07 -0700362
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100363config X86_32_SMP
364 def_bool y
365 depends on X86_32 && SMP
366
367config X86_64_SMP
368 def_bool y
369 depends on X86_64 && SMP
370
Srikar Dronamraju2b144492012-02-09 14:56:42 +0530371config ARCH_SUPPORTS_UPROBES
372 def_bool y
373
Rob Herringd20642f2014-04-18 17:19:54 -0500374config FIX_EARLYCON_MEM
375 def_bool y
376
Kirill A. Shutemov94d49eb2018-05-18 14:30:28 +0300377config DYNAMIC_PHYSICAL_MASK
378 bool
379
Kirill A. Shutemov98233362015-04-14 15:46:14 -0700380config PGTABLE_LEVELS
381 int
Kirill A. Shutemov77ef56e2017-07-17 01:59:54 +0300382 default 5 if X86_5LEVEL
Kirill A. Shutemov98233362015-04-14 15:46:14 -0700383 default 4 if X86_64
384 default 3 if X86_PAE
385 default 2
386
Masahiro Yamada2a61f472018-05-28 18:22:00 +0900387config CC_HAS_SANE_STACKPROTECTOR
388 bool
389 default $(success,$(srctree)/scripts/gcc-x86_64-has-stack-protector.sh $(CC)) if 64BIT
390 default $(success,$(srctree)/scripts/gcc-x86_32-has-stack-protector.sh $(CC))
391 help
392 We have to make sure stack protector is unconditionally disabled if
Andy Lutomirski3fb0fdb2021-02-13 11:19:44 -0800393 the compiler produces broken code or if it does not let us control
394 the segment on 32-bit kernels.
Masahiro Yamada2a61f472018-05-28 18:22:00 +0900395
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100396menu "Processor type and features"
397
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100398config SMP
399 bool "Symmetric multi-processing support"
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900400 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100401 This enables support for systems with more than one CPU. If you have
Robert Graffham4a474152014-01-23 15:55:29 -0800402 a system with only one CPU, say N. If you have a system with more
403 than one CPU, say Y.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100404
Robert Graffham4a474152014-01-23 15:55:29 -0800405 If you say N here, the kernel will run on uni- and multiprocessor
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100406 machines, but will use only one CPU of a multiprocessor machine. If
407 you say Y here, the kernel will run on many, but not all,
Robert Graffham4a474152014-01-23 15:55:29 -0800408 uniprocessor machines. On a uniprocessor machine, the kernel
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100409 will run faster if you say N here.
410
411 Note that if you say Y here and choose architecture "586" or
412 "Pentium" under "Processor family", the kernel will not work on 486
413 architectures. Similarly, multiprocessor kernels for the "PPro"
414 architecture may not work on all Pentium based boards.
415
416 People using multiprocessor machines who say Y here should also say
417 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
418 Management" code will be disabled if you say Y here.
419
Mauro Carvalho Chehabcb1aaeb2019-06-07 15:54:32 -0300420 See also <file:Documentation/x86/i386/IO-APIC.rst>,
Mauro Carvalho Chehab4f4cfa62019-06-27 14:56:51 -0300421 <file:Documentation/admin-guide/lockup-watchdogs.rst> and the SMP-HOWTO available at
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100422 <http://www.tldp.org/docs.html#howto>.
423
424 If you don't know what to do here, say N.
425
Josh Triplett9def39be2013-10-30 08:09:45 -0700426config X86_FEATURE_NAMES
427 bool "Processor feature human-readable names" if EMBEDDED
428 default y
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900429 help
Josh Triplett9def39be2013-10-30 08:09:45 -0700430 This option compiles in a table of x86 feature bits and corresponding
431 names. This is required to support /proc/cpuinfo and a few kernel
432 messages. You can disable this to save space, at the expense of
433 making those few kernel messages show numeric feature bits instead.
434
435 If in doubt, say Y.
436
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800437config X86_X2APIC
438 bool "Support x2apic"
Jan Kiszka19e3d602015-05-04 17:58:01 +0200439 depends on X86_LOCAL_APIC && X86_64 && (IRQ_REMAP || HYPERVISOR_GUEST)
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900440 help
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800441 This enables x2apic support on CPUs that have this feature.
442
443 This allows 32-bit apic IDs (so it can support very large systems),
444 and accesses the local apic via MSRs not via mmio.
445
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800446 If you don't know what to do here, say N.
447
Yinghai Lu6695c852008-06-19 12:13:09 -0700448config X86_MPPARSE
Andy Shevchenko4590d982021-02-11 15:40:02 +0200449 bool "Enable MPS table" if ACPI
Jan Beulich7a527682008-10-30 10:38:24 +0000450 default y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200451 depends on X86_LOCAL_APIC
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900452 help
Yinghai Lu6695c852008-06-19 12:13:09 -0700453 For old smp systems that do not have proper acpi support. Newer systems
454 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
Yinghai Lu6695c852008-06-19 12:13:09 -0700455
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000456config GOLDFISH
Krzysztof Kozlowskib03b0162019-11-21 04:21:09 +0100457 def_bool y
458 depends on X86_GOLDFISH
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000459
David Woodhouse76b04382018-01-11 21:46:25 +0000460config RETPOLINE
461 bool "Avoid speculative indirect branches in kernel"
462 default y
463 help
464 Compile kernel with the retpoline compiler options to guard against
465 kernel-to-user data leaks by avoiding speculative indirect
466 branches. Requires a compiler with -mindirect-branch=thunk-extern
467 support for full protection. The kernel may run slower.
468
Peter Zijlstrae463a092021-12-04 14:43:44 +0100469config CC_HAS_SLS
470 def_bool $(cc-option,-mharden-sls=all)
471
472config SLS
473 bool "Mitigate Straight-Line-Speculation"
474 depends on CC_HAS_SLS && X86_64
475 default n
476 help
477 Compile the kernel with straight-line-speculation options to guard
478 against straight line speculation. The kernel image might be slightly
479 larger.
480
Johannes Weinere6d42932019-01-29 17:44:36 -0500481config X86_CPU_RESCTRL
482 bool "x86 CPU resource control support"
Babu Moger6fe07ce2018-11-21 20:28:39 +0000483 depends on X86 && (CPU_SUP_INTEL || CPU_SUP_AMD)
Thomas Gleixner59fe5a72016-11-15 15:17:12 +0100484 select KERNFS
Chen Yue79f15a2020-01-15 17:28:51 +0800485 select PROC_CPU_RESCTRL if PROC_FS
Fenghua Yu78e99b42016-10-22 06:19:53 -0700486 help
Johannes Weinere6d42932019-01-29 17:44:36 -0500487 Enable x86 CPU resource control support.
Babu Moger6fe07ce2018-11-21 20:28:39 +0000488
489 Provide support for the allocation and monitoring of system resources
490 usage by the CPU.
491
492 Intel calls this Intel Resource Director Technology
493 (Intel(R) RDT). More information about RDT can be found in the
494 Intel x86 Architecture Software Developer Manual.
495
496 AMD calls this AMD Platform Quality of Service (AMD QoS).
497 More information about AMD QoS can be found in the AMD64 Technology
498 Platform Quality of Service Extensions manual.
Fenghua Yu78e99b42016-10-22 06:19:53 -0700499
500 Say N if unsure.
501
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800502if X86_32
Randy Dunlapa0d0bb42018-02-09 16:51:03 -0800503config X86_BIGSMP
504 bool "Support for big SMP systems with more than 8 CPUs"
505 depends on SMP
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900506 help
Randy Dunlape133f6e2019-12-03 16:06:47 -0800507 This option is needed for the systems that have more than 8 CPUs.
Randy Dunlapa0d0bb42018-02-09 16:51:03 -0800508
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800509config X86_EXTENDED_PLATFORM
510 bool "Support for extended (non-PC) x86 platforms"
511 default y
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900512 help
Ingo Molnar06ac8342009-01-27 18:11:43 +0100513 If you disable this option then the kernel will only support
514 standard PC platforms. (which covers the vast majority of
515 systems out there.)
516
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800517 If you enable this option then you'll be able to select support
518 for the following (non-PC) 32 bit x86 platforms:
Ben Hutchingscb7b8022013-06-24 01:05:25 +0100519 Goldfish (Android emulator)
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800520 AMD Elan
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800521 RDC R-321x SoC
522 SGI 320/540 (Visual Workstation)
Alessandro Rubini83125a32012-04-04 19:40:21 +0200523 STA2X11-based (e.g. Northville)
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200524 Moorestown MID devices
Ingo Molnar06ac8342009-01-27 18:11:43 +0100525
526 If you have one of these systems, or if you want to build a
527 generic distribution kernel, say Y here - otherwise say N.
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800528endif
Ingo Molnar06ac8342009-01-27 18:11:43 +0100529
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800530if X86_64
531config X86_EXTENDED_PLATFORM
532 bool "Support for extended (non-PC) x86 platforms"
533 default y
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900534 help
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800535 If you disable this option then the kernel will only support
536 standard PC platforms. (which covers the vast majority of
537 systems out there.)
538
539 If you enable this option then you'll be able to select support
540 for the following (non-PC) 64 bit x86 platforms:
Steffen Persvold44b111b52011-12-06 00:07:26 +0800541 Numascale NumaChip
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800542 ScaleMP vSMP
543 SGI Ultraviolet
544
545 If you have one of these systems, or if you want to build a
546 generic distribution kernel, say Y here - otherwise say N.
547endif
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800548# This is an alphabetically sorted list of 64 bit extended platforms
549# Please maintain the alphabetic order if and when there are additions
Steffen Persvold44b111b52011-12-06 00:07:26 +0800550config X86_NUMACHIP
551 bool "Numascale NumaChip"
552 depends on X86_64
553 depends on X86_EXTENDED_PLATFORM
554 depends on NUMA
555 depends on SMP
556 depends on X86_X2APIC
Daniel J Bluemanf9726bf2012-12-07 14:24:32 -0700557 depends on PCI_MMCONFIG
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900558 help
Steffen Persvold44b111b52011-12-06 00:07:26 +0800559 Adds support for Numascale NumaChip large-SMP systems. Needed to
560 enable more than ~168 cores.
561 If you don't have one of these, you should say N here.
Nick Piggin03b48632009-01-20 04:36:04 +0100562
Ingo Molnar6a485652009-01-27 18:29:13 +0100563config X86_VSMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800564 bool "ScaleMP vSMP"
Borislav Petkov6276a072013-03-04 21:20:21 +0100565 select HYPERVISOR_GUEST
Ingo Molnar6a485652009-01-27 18:29:13 +0100566 select PARAVIRT
567 depends on X86_64 && PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800568 depends on X86_EXTENDED_PLATFORM
Shai Fultheimead91d42012-04-16 10:39:35 +0300569 depends on SMP
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900570 help
Ingo Molnar6a485652009-01-27 18:29:13 +0100571 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
572 supposed to run on these EM64T-based machines. Only choose this option
573 if you have one of these machines.
574
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800575config X86_UV
576 bool "SGI Ultraviolet"
577 depends on X86_64
578 depends on X86_EXTENDED_PLATFORM
Jack Steiner54c28d22009-04-03 15:39:42 -0500579 depends on NUMA
Andrew Morton1ecb4ae2016-02-11 16:13:20 -0800580 depends on EFI
Ingo Molnarc2209ea2021-04-20 09:47:42 +0200581 depends on KEXEC_CORE
Suresh Siddha9d6c26e2009-04-20 13:02:31 -0700582 depends on X86_X2APIC
Ingo Molnar1222e562015-05-06 06:23:59 +0200583 depends on PCI
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900584 help
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800585 This option is needed in order to support SGI Ultraviolet systems.
586 If you don't have one of these, you should say N here.
587
588# Following is an alphabetically sorted list of 32 bit extended platforms
589# Please maintain the alphabetic order if and when there are additions
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100590
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000591config X86_GOLDFISH
Krzysztof Kozlowskib03b0162019-11-21 04:21:09 +0100592 bool "Goldfish (Virtual Platform)"
593 depends on X86_EXTENDED_PLATFORM
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900594 help
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000595 Enable support for the Goldfish virtual platform used primarily
596 for Android development. Unless you are building for the Android
597 Goldfish emulator say N here.
598
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800599config X86_INTEL_CE
600 bool "CE4100 TV platform"
601 depends on PCI
602 depends on PCI_GODIRECT
Jiang Liu6084a6e2014-06-09 16:19:46 +0800603 depends on X86_IO_APIC
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800604 depends on X86_32
605 depends on X86_EXTENDED_PLATFORM
Dirk Brandewie37bc9f52010-11-09 12:08:08 -0800606 select X86_REBOOTFIXUPS
Sebastian Andrzej Siewiorda6b7372011-02-22 21:07:37 +0100607 select OF
608 select OF_EARLY_FLATTREE
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900609 help
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800610 Select for the Intel CE media processor (CE4100) SOC.
611 This option compiles in support for the CE4100 SOC for settop
612 boxes and media devices.
613
David Cohen4cb9b002013-12-16 17:37:26 -0800614config X86_INTEL_MID
Alan Cox43605ef2011-07-12 17:49:29 +0100615 bool "Intel MID platform support"
Alan Cox43605ef2011-07-12 17:49:29 +0100616 depends on X86_EXTENDED_PLATFORM
David Cohenedc6bc72014-01-21 10:41:39 -0800617 depends on X86_PLATFORM_DEVICES
Alan Cox1ea7c672011-11-10 13:29:14 +0000618 depends on PCI
Andy Shevchenko3fda5bb2016-01-15 22:11:07 +0200619 depends on X86_64 || (PCI_GOANY && X86_32)
Alan Cox1ea7c672011-11-10 13:29:14 +0000620 depends on X86_IO_APIC
David Cohen4cb9b002013-12-16 17:37:26 -0800621 select I2C
Alan Cox7c9c3a12011-12-29 14:43:16 +0000622 select DW_APB_TIMER
Mika Westerberg54b34aa2020-04-16 11:15:33 +0300623 select INTEL_SCU_PCI
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900624 help
David Cohen4cb9b002013-12-16 17:37:26 -0800625 Select to build a kernel capable of supporting Intel MID (Mobile
626 Internet Device) platform systems which do not have the PCI legacy
627 interfaces. If you are building for a PC class system say N here.
Alan Cox1ea7c672011-11-10 13:29:14 +0000628
David Cohen4cb9b002013-12-16 17:37:26 -0800629 Intel MID platforms are based on an Intel processor and chipset which
630 consume less power than most of the x86 derivatives.
Alan Cox43605ef2011-07-12 17:49:29 +0100631
Bryan O'Donoghue8bbc2a12015-01-30 16:29:39 +0000632config X86_INTEL_QUARK
633 bool "Intel Quark platform support"
634 depends on X86_32
635 depends on X86_EXTENDED_PLATFORM
636 depends on X86_PLATFORM_DEVICES
637 depends on X86_TSC
638 depends on PCI
639 depends on PCI_GOANY
640 depends on X86_IO_APIC
641 select IOSF_MBI
642 select INTEL_IMR
Andy Shevchenko9ab6eb52015-03-05 17:24:04 +0200643 select COMMON_CLK
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900644 help
Bryan O'Donoghue8bbc2a12015-01-30 16:29:39 +0000645 Select to include support for Quark X1000 SoC.
646 Say Y here if you have a Quark based system such as the Arduino
647 compatible Intel Galileo.
648
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000649config X86_INTEL_LPSS
650 bool "Intel Low Power Subsystem Support"
Sinan Kaya5962dd22019-01-02 18:10:37 +0000651 depends on X86 && ACPI && PCI
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000652 select COMMON_CLK
Mathias Nyman0f531432013-09-13 17:02:29 +0300653 select PINCTRL
Andy Shevchenkoeebb3e82015-12-12 02:45:06 +0100654 select IOSF_MBI
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900655 help
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000656 Select to build support for Intel Low Power Subsystem such as
657 found on Intel Lynxpoint PCH. Selecting this option enables
Mathias Nyman0f531432013-09-13 17:02:29 +0300658 things like clock tree (common clock framework) and pincontrol
659 which are needed by the LPSS peripheral drivers.
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000660
Ken Xue92082a82015-02-06 08:27:51 +0800661config X86_AMD_PLATFORM_DEVICE
662 bool "AMD ACPI2Platform devices support"
663 depends on ACPI
664 select COMMON_CLK
665 select PINCTRL
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900666 help
Ken Xue92082a82015-02-06 08:27:51 +0800667 Select to interpret AMD specific ACPI device to platform device
668 such as I2C, UART, GPIO found on AMD Carrizo and later chipsets.
669 I2C and UART depend on COMMON_CLK to set clock. GPIO driver is
670 implemented under PINCTRL subsystem.
671
David E. Boxced3ce72014-09-17 22:13:50 -0700672config IOSF_MBI
673 tristate "Intel SoC IOSF Sideband support for SoC platforms"
674 depends on PCI
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900675 help
David E. Boxced3ce72014-09-17 22:13:50 -0700676 This option enables sideband register access support for Intel SoC
677 platforms. On these platforms the IOSF sideband is used in lieu of
678 MSR's for some register accesses, mostly but not limited to thermal
679 and power. Drivers may query the availability of this device to
680 determine if they need the sideband in order to work on these
681 platforms. The sideband is available on the following SoC products.
682 This list is not meant to be exclusive.
683 - BayTrail
684 - Braswell
685 - Quark
686
687 You should say Y if you are running a kernel on one of these SoC's.
688
David E. Boxed2226b2014-09-17 22:13:51 -0700689config IOSF_MBI_DEBUG
690 bool "Enable IOSF sideband access through debugfs"
691 depends on IOSF_MBI && DEBUG_FS
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900692 help
David E. Boxed2226b2014-09-17 22:13:51 -0700693 Select this option to expose the IOSF sideband access registers (MCR,
694 MDR, MCRX) through debugfs to write and read register information from
695 different units on the SoC. This is most useful for obtaining device
696 state information for debug and analysis. As this is a general access
697 mechanism, users of this option would have specific knowledge of the
698 device they want to access.
699
700 If you don't require the option or are in doubt, say N.
701
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800702config X86_RDC321X
703 bool "RDC R-321x SoC"
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100704 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800705 depends on X86_EXTENDED_PLATFORM
706 select M486
707 select X86_REBOOTFIXUPS
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900708 help
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800709 This option is needed for RDC R-321x system-on-chip, also known
710 as R-8610-(G).
711 If you don't have one of these chips, you should say N here.
712
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100713config X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100714 bool "Support non-standard 32-bit SMP architectures"
715 depends on X86_32 && SMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800716 depends on X86_EXTENDED_PLATFORM
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900717 help
H. Peter Anvinb5660ba2014-02-25 12:14:06 -0800718 This option compiles in the bigsmp and STA2X11 default
719 subarchitectures. It is intended for a generic binary
720 kernel. If you select them all, kernel will probe it one by
721 one and will fallback to default.
Yinghai Lud49c4282008-06-08 18:31:54 -0700722
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800723# Alphabetically sorted list of Non standard 32 bit platforms
Yinghai Lud49c4282008-06-08 18:31:54 -0700724
Linus Torvaldsd949f362009-09-26 09:35:07 -0700725config X86_SUPPORTS_MEMORY_FAILURE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100726 def_bool y
Linus Torvaldsd949f362009-09-26 09:35:07 -0700727 # MCE code calls memory_failure():
728 depends on X86_MCE
729 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
Linus Torvaldsd949f362009-09-26 09:35:07 -0700730 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
731 depends on X86_64 || !SPARSEMEM
732 select ARCH_SUPPORTS_MEMORY_FAILURE
Linus Torvaldsd949f362009-09-26 09:35:07 -0700733
Alessandro Rubini83125a32012-04-04 19:40:21 +0200734config STA2X11
735 bool "STA2X11 Companion Chip Support"
736 depends on X86_32_NON_STANDARD && PCI
Alessandro Rubini83125a32012-04-04 19:40:21 +0200737 select SWIOTLB
738 select MFD_STA2X11
Linus Walleij01450712016-06-02 14:20:18 +0200739 select GPIOLIB
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900740 help
Alessandro Rubini83125a32012-04-04 19:40:21 +0200741 This adds support for boards based on the STA2X11 IO-Hub,
742 a.k.a. "ConneXt". The chip is used in place of the standard
743 PC chipset, so all "standard" peripherals are missing. If this
744 option is selected the kernel will still be able to boot on
745 standard PC machines.
746
Shérab82148d12010-09-25 06:06:57 +0200747config X86_32_IRIS
748 tristate "Eurobraille/Iris poweroff module"
749 depends on X86_32
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900750 help
Shérab82148d12010-09-25 06:06:57 +0200751 The Iris machines from EuroBraille do not have APM or ACPI support
752 to shut themselves down properly. A special I/O sequence is
753 needed to do so, which is what this module does at
754 kernel shutdown.
755
756 This is only for Iris machines from EuroBraille.
757
758 If unused, say N.
759
Ingo Molnarae1e9132008-11-11 09:05:16 +0100760config SCHED_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100761 def_bool y
762 prompt "Single-depth WCHAN output"
Ken Chena87d0912008-11-06 11:10:49 -0800763 depends on X86
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900764 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100765 Calculate simpler /proc/<PID>/wchan values. If this option
766 is disabled then wchan values will recurse back to the
767 caller function. This provides more accurate wchan values,
768 at the expense of slightly more scheduling overhead.
769
770 If in doubt, say "Y".
771
Borislav Petkov6276a072013-03-04 21:20:21 +0100772menuconfig HYPERVISOR_GUEST
773 bool "Linux guest support"
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900774 help
Borislav Petkov6276a072013-03-04 21:20:21 +0100775 Say Y here to enable options for running Linux under various hyper-
776 visors. This option enables basic hypervisor detection and platform
777 setup.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100778
Borislav Petkov6276a072013-03-04 21:20:21 +0100779 If you say N, all options in this submenu will be skipped and
780 disabled, and Linux guest support won't be built in.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100781
Borislav Petkov6276a072013-03-04 21:20:21 +0100782if HYPERVISOR_GUEST
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100783
Eduardo Pereira Habkoste61bd94a2008-01-30 13:33:32 +0100784config PARAVIRT
785 bool "Enable paravirtualization code"
Juergen Grossa0e2bf72021-03-11 15:23:09 +0100786 depends on HAVE_STATIC_CALL
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900787 help
Eduardo Pereira Habkoste61bd94a2008-01-30 13:33:32 +0100788 This changes the kernel so it can modify itself when it is run
789 under a hypervisor, potentially improving performance significantly
790 over full virtualization. However, when run without a hypervisor
791 the kernel is theoretically slower and slightly larger.
792
Juergen Grossc00a2802018-08-28 09:40:21 +0200793config PARAVIRT_XXL
794 bool
795
Borislav Petkov6276a072013-03-04 21:20:21 +0100796config PARAVIRT_DEBUG
797 bool "paravirt-ops debugging"
798 depends on PARAVIRT && DEBUG_KERNEL
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900799 help
Borislav Petkov6276a072013-03-04 21:20:21 +0100800 Enable to debug paravirt_ops internals. Specifically, BUG if
801 a paravirt_op is missing when it is called.
802
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700803config PARAVIRT_SPINLOCKS
804 bool "Paravirtualization layer for spinlocks"
Kees Cook6ea30382012-10-02 11:16:47 -0700805 depends on PARAVIRT && SMP
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900806 help
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700807 Paravirtualized spinlocks allow a pvops backend to replace the
808 spinlock implementation with something virtualization-friendly
809 (for example, block the virtual CPU rather than spinning).
810
Raghavendra K T4c4e4f62013-10-21 21:35:08 +0530811 It has a minimal impact on native kernels and gives a nice performance
812 benefit on paravirtualized KVM / Xen kernels.
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700813
Raghavendra K T4c4e4f62013-10-21 21:35:08 +0530814 If you are unsure how to answer this question, answer Y.
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700815
Zhao Yakuiecca25022019-04-30 11:45:23 +0800816config X86_HV_CALLBACK_VECTOR
817 def_bool n
818
Borislav Petkov6276a072013-03-04 21:20:21 +0100819source "arch/x86/xen/Kconfig"
820
821config KVM_GUEST
822 bool "KVM Guest support (including kvmclock)"
823 depends on PARAVIRT
824 select PARAVIRT_CLOCK
Marcelo Tosattia1c44232019-07-03 20:51:29 -0300825 select ARCH_CPUIDLE_HALTPOLL
Vitaly Kuznetsovb1d40572020-05-25 16:41:23 +0200826 select X86_HV_CALLBACK_VECTOR
Borislav Petkov6276a072013-03-04 21:20:21 +0100827 default y
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900828 help
Borislav Petkov6276a072013-03-04 21:20:21 +0100829 This option enables various optimizations for running under the KVM
830 hypervisor. It includes a paravirtualized clock, so that instead
831 of relying on a PIT (or probably other) emulation by the
832 underlying device model, the host provides the guest with
833 timing infrastructure such as time of day, and system time
834
Marcelo Tosattia1c44232019-07-03 20:51:29 -0300835config ARCH_CPUIDLE_HALTPOLL
Krzysztof Kozlowskib03b0162019-11-21 04:21:09 +0100836 def_bool n
837 prompt "Disable host haltpoll when loading haltpoll driver"
838 help
Marcelo Tosattia1c44232019-07-03 20:51:29 -0300839 If virtualized under KVM, disable host haltpoll.
840
Maran Wilson77336072018-12-10 11:07:28 -0800841config PVH
842 bool "Support for running PVH guests"
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900843 help
Maran Wilson77336072018-12-10 11:07:28 -0800844 This option enables the PVH entry point for guest virtual machines
845 as specified in the x86/HVM direct boot ABI.
846
Borislav Petkov6276a072013-03-04 21:20:21 +0100847config PARAVIRT_TIME_ACCOUNTING
848 bool "Paravirtual steal time accounting"
849 depends on PARAVIRT
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900850 help
Borislav Petkov6276a072013-03-04 21:20:21 +0100851 Select this option to enable fine granularity task steal time
852 accounting. Time spent executing other tasks in parallel with
853 the current vCPU is discounted from the vCPU power. To account for
854 that, there can be a small performance impact.
855
856 If in doubt, say N here.
857
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200858config PARAVIRT_CLOCK
859 bool
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200860
Jan Kiszka4a362602017-11-27 09:11:46 +0100861config JAILHOUSE_GUEST
862 bool "Jailhouse non-root cell support"
Arnd Bergmannabde5872018-01-15 16:51:20 +0100863 depends on X86_64 && PCI
Jan Kiszka87e65d02017-11-27 09:11:48 +0100864 select X86_PM_TIMER
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900865 help
Jan Kiszka4a362602017-11-27 09:11:46 +0100866 This option allows to run Linux as guest in a Jailhouse non-root
867 cell. You can leave this option disabled if you only want to start
868 Jailhouse and run Linux afterwards in the root cell.
869
Zhao Yakuiec7972c2019-04-30 11:45:24 +0800870config ACRN_GUEST
871 bool "ACRN Guest support"
872 depends on X86_64
Zhao Yakui498ad392019-04-30 11:45:25 +0800873 select X86_HV_CALLBACK_VECTOR
Zhao Yakuiec7972c2019-04-30 11:45:24 +0800874 help
875 This option allows to run Linux as guest in the ACRN hypervisor. ACRN is
876 a flexible, lightweight reference open-source hypervisor, built with
877 real-time and safety-criticality in mind. It is built for embedded
878 IOT with small footprint and real-time features. More details can be
879 found in https://projectacrn.org/.
880
Borislav Petkov6276a072013-03-04 21:20:21 +0100881endif #HYPERVISOR_GUEST
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400882
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100883source "arch/x86/Kconfig.cpu"
884
885config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100886 def_bool X86_64
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100887 prompt "HPET Timer Support" if X86_32
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900888 help
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100889 Use the IA-PC HPET (High Precision Event Timer) to manage
890 time in preference to the PIT and RTC, if a HPET is
891 present.
892 HPET is the next generation timer replacing legacy 8254s.
893 The HPET provides a stable time base on SMP
894 systems, unlike the TSC, but it is more expensive to access,
Michael S. Tsirkin4e7f9df2016-02-11 01:05:01 +0200895 as it is off-chip. The interface used is documented
896 in the HPET spec, revision 1.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100897
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100898 You can safely choose Y here. However, HPET will only be
899 activated if the platform and the BIOS support this feature.
900 Otherwise the 8254 will be used for timing services.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100901
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100902 Choose N to continue using the legacy 8254 timer.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100903
904config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100905 def_bool y
Anand K Mistry3228e1d2021-02-04 18:32:32 +1100906 depends on HPET_TIMER && (RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100907
David Rientjes6a108a12011-01-20 14:44:16 -0800908# Mark as expert because too many people got it wrong.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100909# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700910config DMI
911 default y
Ard Biesheuvelcf074402014-01-23 15:54:39 -0800912 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
David Rientjes6a108a12011-01-20 14:44:16 -0800913 bool "Enable DMI scanning" if EXPERT
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900914 help
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700915 Enabled scanning of DMI to identify machine quirks. Say Y
916 here unless you have verified that your setup is not
917 affected by entries in the DMI blacklist. Required by PNP
918 BIOS code.
919
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100920config GART_IOMMU
Andi Kleen38901f12013-10-04 14:37:56 -0700921 bool "Old AMD GART IOMMU support"
Christoph Hellwig2f9237d2020-07-08 09:30:00 +0200922 select DMA_OPS
Christoph Hellwiga4ce5a42018-04-03 15:47:59 +0200923 select IOMMU_HELPER
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100924 select SWIOTLB
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +0200925 depends on X86_64 && PCI && AMD_NB
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900926 help
Ingo Molnarced3c422013-10-06 11:45:20 +0200927 Provides a driver for older AMD Athlon64/Opteron/Turion/Sempron
928 GART based hardware IOMMUs.
929
930 The GART supports full DMA access for devices with 32-bit access
931 limitations, on systems with more than 3 GB. This is usually needed
932 for USB, sound, many IDE/SATA chipsets and some other devices.
933
934 Newer systems typically have a modern AMD IOMMU, supported via
935 the CONFIG_AMD_IOMMU=y config option.
936
937 In normal configurations this driver is only active when needed:
938 there's more than 3 GB of memory and the system contains a
939 32-bit limited device.
940
941 If unsure, say Y.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100942
Mike Travis1184dc22008-05-12 21:21:12 +0200943config MAXSMP
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200944 bool "Enable Maximum number of SMP Processors and NUMA Nodes"
Kees Cook6ea30382012-10-02 11:16:47 -0700945 depends on X86_64 && SMP && DEBUG_KERNEL
Mike Travis36f51012008-12-16 17:33:51 -0800946 select CPUMASK_OFFSTACK
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900947 help
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200948 Enable maximum number of CPUS and NUMA Nodes for this architecture.
Mike Travis1184dc22008-05-12 21:21:12 +0200949 If unsure, say N.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100950
Ingo Molnaraec64872018-02-10 12:36:29 +0100951#
952# The maximum number of CPUs supported:
953#
954# The main config value is NR_CPUS, which defaults to NR_CPUS_DEFAULT,
955# and which can be configured interactively in the
956# [NR_CPUS_RANGE_BEGIN ... NR_CPUS_RANGE_END] range.
957#
958# The ranges are different on 32-bit and 64-bit kernels, depending on
959# hardware capabilities and scalability features of the kernel.
960#
961# ( If MAXSMP is enabled we just use the highest possible value and disable
962# interactive configuration. )
963#
964
965config NR_CPUS_RANGE_BEGIN
966 int
967 default NR_CPUS_RANGE_END if MAXSMP
968 default 1 if !SMP
969 default 2
970
971config NR_CPUS_RANGE_END
Randy Dunlapa0d0bb42018-02-09 16:51:03 -0800972 int
973 depends on X86_32
Ingo Molnaraec64872018-02-10 12:36:29 +0100974 default 64 if SMP && X86_BIGSMP
975 default 8 if SMP && !X86_BIGSMP
976 default 1 if !SMP
Randy Dunlapa0d0bb42018-02-09 16:51:03 -0800977
Ingo Molnaraec64872018-02-10 12:36:29 +0100978config NR_CPUS_RANGE_END
Randy Dunlapa0d0bb42018-02-09 16:51:03 -0800979 int
980 depends on X86_64
Scott Wood1edae1a2019-10-12 02:00:54 -0500981 default 8192 if SMP && CPUMASK_OFFSTACK
982 default 512 if SMP && !CPUMASK_OFFSTACK
Ingo Molnaraec64872018-02-10 12:36:29 +0100983 default 1 if !SMP
Randy Dunlapa0d0bb42018-02-09 16:51:03 -0800984
Ingo Molnaraec64872018-02-10 12:36:29 +0100985config NR_CPUS_DEFAULT
Randy Dunlapa0d0bb42018-02-09 16:51:03 -0800986 int
987 depends on X86_32
Ingo Molnaraec64872018-02-10 12:36:29 +0100988 default 32 if X86_BIGSMP
989 default 8 if SMP
990 default 1 if !SMP
Randy Dunlapa0d0bb42018-02-09 16:51:03 -0800991
Ingo Molnaraec64872018-02-10 12:36:29 +0100992config NR_CPUS_DEFAULT
Randy Dunlapa0d0bb42018-02-09 16:51:03 -0800993 int
994 depends on X86_64
Ingo Molnaraec64872018-02-10 12:36:29 +0100995 default 8192 if MAXSMP
996 default 64 if SMP
997 default 1 if !SMP
Randy Dunlapa0d0bb42018-02-09 16:51:03 -0800998
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100999config NR_CPUS
Mike Travis36f51012008-12-16 17:33:51 -08001000 int "Maximum number of CPUs" if SMP && !MAXSMP
Ingo Molnaraec64872018-02-10 12:36:29 +01001001 range NR_CPUS_RANGE_BEGIN NR_CPUS_RANGE_END
1002 default NR_CPUS_DEFAULT
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001003 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001004 This allows you to specify the maximum number of CPUs which this
Josh Boyerbb61ccc2013-11-05 09:37:29 -05001005 kernel will support. If CPUMASK_OFFSTACK is enabled, the maximum
Kirill A. Shutemovcad14bb2015-05-08 13:25:26 +03001006 supported value is 8192, otherwise the maximum value is 512. The
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001007 minimum value which makes sense is 2.
1008
Ingo Molnaraec64872018-02-10 12:36:29 +01001009 This is purely to save memory: each supported CPU adds about 8KB
1010 to the kernel image.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001011
Tim Chen66558b72021-09-24 20:51:04 +12001012config SCHED_CLUSTER
1013 bool "Cluster scheduler support"
1014 depends on SMP
1015 default y
1016 help
1017 Cluster scheduler support improves the CPU scheduler's decision
1018 making when dealing with machines that have clusters of CPUs.
1019 Cluster usually means a couple of CPUs which are placed closely
1020 by sharing mid-level caches, last-level cache tags or internal
1021 busses.
1022
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001023config SCHED_SMT
Thomas Gleixnerdbe73362018-11-25 19:33:37 +01001024 def_bool y if SMP
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001025
1026config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001027 def_bool y
1028 prompt "Multi-core scheduler support"
Borislav Petkovc8e56d22015-06-04 18:55:25 +02001029 depends on SMP
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001030 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001031 Multi-core scheduler support improves the CPU scheduler's decision
1032 making when dealing with multi-core CPU chips at a cost of slightly
1033 increased overhead in some places. If unsure say N here.
1034
Tim Chende966cf2016-11-29 10:43:27 -08001035config SCHED_MC_PRIO
1036 bool "CPU core priorities scheduler support"
Ingo Molnar0a21fc12016-11-30 08:33:54 +01001037 depends on SCHED_MC && CPU_SUP_INTEL
1038 select X86_INTEL_PSTATE
1039 select CPU_FREQ
Tim Chende966cf2016-11-29 10:43:27 -08001040 default y
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001041 help
Ingo Molnar0a21fc12016-11-30 08:33:54 +01001042 Intel Turbo Boost Max Technology 3.0 enabled CPUs have a
1043 core ordering determined at manufacturing time, which allows
1044 certain cores to reach higher turbo frequencies (when running
1045 single threaded workloads) than others.
Tim Chende966cf2016-11-29 10:43:27 -08001046
Ingo Molnar0a21fc12016-11-30 08:33:54 +01001047 Enabling this kernel feature teaches the scheduler about
1048 the TBM3 (aka ITMT) priority order of the CPU cores and adjusts the
1049 scheduler's CPU selection logic accordingly, so that higher
1050 overall system performance can be achieved.
Tim Chende966cf2016-11-29 10:43:27 -08001051
Ingo Molnar0a21fc12016-11-30 08:33:54 +01001052 This feature will have no effect on CPUs without this feature.
Tim Chende966cf2016-11-29 10:43:27 -08001053
Ingo Molnar0a21fc12016-11-30 08:33:54 +01001054 If unsure say Y here.
Tim Chen5e76b2a2016-11-22 12:23:55 -08001055
Thomas Gleixner30b8b002015-01-15 21:22:39 +00001056config UP_LATE_INIT
Krzysztof Kozlowskib03b0162019-11-21 04:21:09 +01001057 def_bool y
1058 depends on !SMP && X86_LOCAL_APIC
Thomas Gleixner30b8b002015-01-15 21:22:39 +00001059
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001060config X86_UP_APIC
Jan Beulich50849ee2015-02-05 15:31:56 +00001061 bool "Local APIC support on uniprocessors" if !PCI_MSI
1062 default PCI_MSI
Bryan O'Donoghue38a1dfd2015-01-22 22:58:49 +00001063 depends on X86_32 && !SMP && !X86_32_NON_STANDARD
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001064 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001065 A local APIC (Advanced Programmable Interrupt Controller) is an
1066 integrated interrupt controller in the CPU. If you have a single-CPU
1067 system which has a processor with a local APIC, you can say Y here to
1068 enable and use it. If you say Y here even though your machine doesn't
1069 have a local APIC, then the kernel will still run with no slowdown at
1070 all. The local APIC supports CPU-generated self-interrupts (timer,
1071 performance counters), and the NMI watchdog which detects hard
1072 lockups.
1073
1074config X86_UP_IOAPIC
1075 bool "IO-APIC support on uniprocessors"
1076 depends on X86_UP_APIC
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001077 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001078 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
1079 SMP-capable replacement for PC-style interrupt controllers. Most
1080 SMP systems and many recent uniprocessor systems have one.
1081
1082 If you have a single-CPU system with an IO-APIC, you can say Y here
1083 to use it. If you say Y here even though your machine doesn't have
1084 an IO-APIC, then the kernel will still run with no slowdown at all.
1085
1086config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001087 def_bool y
Thomas Petazzoni0dbc6072013-10-03 11:59:14 +02001088 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC || PCI_MSI
Jiang Liub5dc8e62015-04-13 14:11:24 +08001089 select IRQ_DOMAIN_HIERARCHY
Jiang Liu52f518a2015-04-13 14:11:35 +08001090 select PCI_MSI_IRQ_DOMAIN if PCI_MSI
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001091
1092config X86_IO_APIC
Jan Beulichb1da1e72015-02-05 15:35:21 +00001093 def_bool y
1094 depends on X86_LOCAL_APIC || X86_UP_IOAPIC
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001095
Stefan Assmann41b9eb22008-07-15 13:48:55 +02001096config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
1097 bool "Reroute for broken boot IRQs"
Stefan Assmann41b9eb22008-07-15 13:48:55 +02001098 depends on X86_IO_APIC
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001099 help
Stefan Assmann41b9eb22008-07-15 13:48:55 +02001100 This option enables a workaround that fixes a source of
1101 spurious interrupts. This is recommended when threaded
1102 interrupt handling is used on systems where the generation of
1103 superfluous "boot interrupts" cannot be disabled.
1104
1105 Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
1106 entry in the chipset's IO-APIC is masked (as, e.g. the RT
1107 kernel does during interrupt handling). On chipsets where this
1108 boot IRQ generation cannot be disabled, this workaround keeps
1109 the original IRQ line masked so that only the equivalent "boot
1110 IRQ" is delivered to the CPUs. The workaround also tells the
1111 kernel to set up the IRQ handler on the boot IRQ line. In this
1112 way only one interrupt is delivered to the kernel. Otherwise
1113 the spurious second interrupt may cause the kernel to bring
1114 down (vital) interrupt lines.
1115
1116 Only affects "broken" chipsets. Interrupt sharing may be
1117 increased on these systems.
1118
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001119config X86_MCE
Andi Kleenbab9bc62009-07-09 00:31:38 +02001120 bool "Machine Check / overheating reporting"
Chen, Gong648ed942015-08-12 18:29:34 +02001121 select GENERIC_ALLOCATOR
Borislav Petkove57dbaf2011-09-13 15:23:21 +02001122 default y
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001123 help
Andi Kleenbab9bc62009-07-09 00:31:38 +02001124 Machine Check support allows the processor to notify the
1125 kernel if it detects a problem (e.g. overheating, data corruption).
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001126 The action the kernel takes depends on the severity of the problem,
Andi Kleenbab9bc62009-07-09 00:31:38 +02001127 ranging from warning messages to halting the machine.
Andi Kleen4efc0672009-04-28 19:07:31 +02001128
Tony Luck5de97c92017-03-27 11:33:03 +02001129config X86_MCELOG_LEGACY
1130 bool "Support for deprecated /dev/mcelog character device"
1131 depends on X86_MCE
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001132 help
Tony Luck5de97c92017-03-27 11:33:03 +02001133 Enable support for /dev/mcelog which is needed by the old mcelog
1134 userspace logging daemon. Consider switching to the new generation
1135 rasdaemon solution.
1136
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001137config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001138 def_bool y
1139 prompt "Intel MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +02001140 depends on X86_MCE && X86_LOCAL_APIC
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001141 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001142 Additional support for intel specific MCE features such as
1143 the thermal monitor.
1144
1145config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001146 def_bool y
1147 prompt "AMD MCE features"
Yazen Ghannamf5382de2016-11-17 17:57:27 -05001148 depends on X86_MCE && X86_LOCAL_APIC && AMD_NB
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001149 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001150 Additional support for AMD specific MCE features such as
1151 the DRAM Error Threshold.
1152
Andi Kleen4efc0672009-04-28 19:07:31 +02001153config X86_ANCIENT_MCE
Jan Beulich6fc108a2010-04-21 15:23:44 +01001154 bool "Support for old Pentium 5 / WinChip machine checks"
Andi Kleenc31d9632009-07-09 00:31:37 +02001155 depends on X86_32 && X86_MCE
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001156 help
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +09001157 Include support for machine check handling on old Pentium 5 or WinChip
Masanari Iida5065a702013-11-30 21:38:43 +09001158 systems. These typically need to be enabled explicitly on the command
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +09001159 line.
Andi Kleen4efc0672009-04-28 19:07:31 +02001160
Andi Kleenb2762682009-02-12 13:49:31 +01001161config X86_MCE_THRESHOLD
1162 depends on X86_MCE_AMD || X86_MCE_INTEL
Jan Beulich6fc108a2010-04-21 15:23:44 +01001163 def_bool y
Andi Kleenb2762682009-02-12 13:49:31 +01001164
Andi Kleenea149b32009-04-29 19:31:00 +02001165config X86_MCE_INJECT
Borislav Petkovbc8e80d2017-06-13 18:28:30 +02001166 depends on X86_MCE && X86_LOCAL_APIC && DEBUG_FS
Andi Kleenea149b32009-04-29 19:31:00 +02001167 tristate "Machine check injector support"
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001168 help
Andi Kleenea149b32009-04-29 19:31:00 +02001169 Provide support for injecting machine checks for testing purposes.
1170 If you don't know what a machine check is and you don't do kernel
1171 QA it is safe to say n.
1172
Peter Zijlstra07dc9002016-03-29 14:30:35 +02001173source "arch/x86/events/Kconfig"
Kan Liange633c65a2016-03-20 01:33:36 -07001174
Andy Lutomirski5aef51c2015-07-10 08:34:23 -07001175config X86_LEGACY_VM86
Ingo Molnar1e642812015-09-05 08:58:10 +02001176 bool "Legacy VM86 support"
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001177 depends on X86_32
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001178 help
Andy Lutomirski5aef51c2015-07-10 08:34:23 -07001179 This option allows user programs to put the CPU into V8086
1180 mode, which is an 80286-era approximation of 16-bit real mode.
1181
1182 Some very old versions of X and/or vbetool require this option
1183 for user mode setting. Similarly, DOSEMU will use it if
1184 available to accelerate real mode DOS programs. However, any
1185 recent version of DOSEMU, X, or vbetool should be fully
1186 functional even without kernel VM86 support, as they will all
Ingo Molnar1e642812015-09-05 08:58:10 +02001187 fall back to software emulation. Nevertheless, if you are using
1188 a 16-bit DOS program where 16-bit performance matters, vm86
1189 mode might be faster than emulation and you might want to
1190 enable this option.
Andy Lutomirski5aef51c2015-07-10 08:34:23 -07001191
Ingo Molnar1e642812015-09-05 08:58:10 +02001192 Note that any app that works on a 64-bit kernel is unlikely to
1193 need this option, as 64-bit kernels don't, and can't, support
1194 V8086 mode. This option is also unrelated to 16-bit protected
1195 mode and is not needed to run most 16-bit programs under Wine.
Andy Lutomirski5aef51c2015-07-10 08:34:23 -07001196
Ingo Molnar1e642812015-09-05 08:58:10 +02001197 Enabling this option increases the complexity of the kernel
1198 and slows down exception handling a tiny bit.
Andy Lutomirski5aef51c2015-07-10 08:34:23 -07001199
Ingo Molnar1e642812015-09-05 08:58:10 +02001200 If unsure, say N here.
Andy Lutomirski5aef51c2015-07-10 08:34:23 -07001201
1202config VM86
Krzysztof Kozlowskib03b0162019-11-21 04:21:09 +01001203 bool
1204 default X86_LEGACY_VM86
H. Peter Anvin34273f42014-05-04 10:36:22 -07001205
1206config X86_16BIT
1207 bool "Enable support for 16-bit segments" if EXPERT
1208 default y
Andy Lutomirskia5b9e5a2015-07-30 14:31:34 -07001209 depends on MODIFY_LDT_SYSCALL
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001210 help
H. Peter Anvin34273f42014-05-04 10:36:22 -07001211 This option is required by programs like Wine to run 16-bit
1212 protected mode legacy code on x86 processors. Disabling
1213 this option saves about 300 bytes on i386, or around 6K text
1214 plus 16K runtime memory on x86-64,
1215
1216config X86_ESPFIX32
1217 def_bool y
1218 depends on X86_16BIT && X86_32
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001219
H. Peter Anvin197725d2014-05-04 10:00:49 -07001220config X86_ESPFIX64
1221 def_bool y
H. Peter Anvin34273f42014-05-04 10:36:22 -07001222 depends on X86_16BIT && X86_64
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001223
Andy Lutomirski1ad83c82014-10-29 14:33:47 -07001224config X86_VSYSCALL_EMULATION
Krzysztof Kozlowskib03b0162019-11-21 04:21:09 +01001225 bool "Enable vsyscall emulation" if EXPERT
1226 default y
1227 depends on X86_64
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001228 help
Andy Lutomirski1ad83c82014-10-29 14:33:47 -07001229 This enables emulation of the legacy vsyscall page. Disabling
1230 it is roughly equivalent to booting with vsyscall=none, except
1231 that it will also disable the helpful warning if a program
1232 tries to use a vsyscall. With this option set to N, offending
1233 programs will just segfault, citing addresses of the form
1234 0xffffffffff600?00.
1235
1236 This option is required by many programs built before 2013, and
1237 care should be used even with newer programs if set to N.
1238
1239 Disabling this option saves about 7K of kernel size and
1240 possibly 4K of additional runtime pagetable memory.
1241
Thomas Gleixner111e7b12019-11-12 21:40:33 +01001242config X86_IOPL_IOPERM
1243 bool "IOPERM and IOPL Emulation"
Thomas Gleixnera24ca992019-11-11 23:03:29 +01001244 default y
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001245 help
Thomas Gleixner111e7b12019-11-12 21:40:33 +01001246 This enables the ioperm() and iopl() syscalls which are necessary
1247 for legacy applications.
1248
Thomas Gleixnerc8137ac2019-11-11 23:03:28 +01001249 Legacy IOPL support is an overbroad mechanism which allows user
1250 space aside of accessing all 65536 I/O ports also to disable
1251 interrupts. To gain this access the caller needs CAP_SYS_RAWIO
1252 capabilities and permission from potentially active security
1253 modules.
1254
1255 The emulation restricts the functionality of the syscall to
1256 only allowing the full range I/O port access, but prevents the
Thomas Gleixnera24ca992019-11-11 23:03:29 +01001257 ability to disable interrupts from user space which would be
1258 granted if the hardware IOPL mechanism would be used.
Thomas Gleixnerc8137ac2019-11-11 23:03:28 +01001259
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001260config TOSHIBA
1261 tristate "Toshiba Laptop support"
1262 depends on X86_32
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001263 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001264 This adds a driver to safely access the System Management Mode of
1265 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
1266 not work on models with a Phoenix BIOS. The System Management Mode
1267 is used to set the BIOS and power saving options on Toshiba portables.
1268
1269 For information on utilities to make use of this driver see the
1270 Toshiba Linux utilities web site at:
1271 <http://www.buzzard.org.uk/toshiba/>.
1272
1273 Say Y if you intend to run this kernel on a Toshiba portable.
1274 Say N otherwise.
1275
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001276config X86_REBOOTFIXUPS
Jan Beulich9ba16082008-10-15 22:01:38 -07001277 bool "Enable X86 board specific fixups for reboot"
1278 depends on X86_32
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001279 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001280 This enables chipset and/or board specific fixups to be done
1281 in order to get reboot to work correctly. This is only needed on
1282 some combinations of hardware and BIOS. The symptom, for which
1283 this config is intended, is when reboot ends with a stalled/hung
1284 system.
1285
1286 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +01001287 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001288
1289 Say Y if you want to enable the fixup. Currently, it's safe to
1290 enable this option even if you don't need it.
1291 Say N otherwise.
1292
1293config MICROCODE
Borislav Petkov9a2bc332015-10-20 11:54:44 +02001294 bool "CPU microcode loading support"
1295 default y
Borislav Petkov80030e32013-10-13 18:36:29 +02001296 depends on CPU_SUP_AMD || CPU_SUP_INTEL
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001297 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001298 If you say Y here, you will be able to update the microcode on
Borislav Petkov5f9c01a2016-02-03 12:33:29 +01001299 Intel and AMD processors. The Intel support is for the IA32 family,
1300 e.g. Pentium Pro, Pentium II, Pentium III, Pentium 4, Xeon etc. The
1301 AMD support is for families 0x10 and later. You will obviously need
1302 the actual microcode binary data itself which is not shipped with
1303 the Linux kernel.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001304
Borislav Petkov5f9c01a2016-02-03 12:33:29 +01001305 The preferred method to load microcode from a detached initrd is described
Mauro Carvalho Chehabcb1aaeb2019-06-07 15:54:32 -03001306 in Documentation/x86/microcode.rst. For that you need to enable
Borislav Petkov5f9c01a2016-02-03 12:33:29 +01001307 CONFIG_BLK_DEV_INITRD in order for the loader to be able to scan the
1308 initrd for microcode blobs.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001309
Benjamin Gilbertc508c462018-01-23 18:06:32 -08001310 In addition, you can build the microcode into the kernel. For that you
1311 need to add the vendor-supplied microcode to the CONFIG_EXTRA_FIRMWARE
1312 config option.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001313
Peter Oruba8d86f392008-07-28 18:44:21 +02001314config MICROCODE_INTEL
Borislav Petkove43f6e62012-08-01 19:17:01 +02001315 bool "Intel microcode loading support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001316 depends on MICROCODE
1317 default MICROCODE
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001318 help
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001319 This options enables microcode patch loading support for Intel
1320 processors.
Peter Oruba8d86f392008-07-28 18:44:21 +02001321
Alanb8989db2014-01-20 18:01:56 +00001322 For the current Intel microcode data package go to
1323 <https://downloadcenter.intel.com> and search for
1324 'Linux Processor Microcode Data File'.
Peter Oruba8d86f392008-07-28 18:44:21 +02001325
Peter Oruba80cc9f12008-07-28 18:44:22 +02001326config MICROCODE_AMD
Borislav Petkove43f6e62012-08-01 19:17:01 +02001327 bool "AMD microcode loading support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001328 depends on MICROCODE
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001329 help
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001330 If you select this option, microcode patch loading support for AMD
1331 processors will be enabled.
Peter Oruba80cc9f12008-07-28 18:44:22 +02001332
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001333config MICROCODE_OLD_INTERFACE
Borislav Petkovc02f48e2019-04-05 06:28:11 +02001334 bool "Ancient loading interface (DEPRECATED)"
1335 default n
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001336 depends on MICROCODE
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001337 help
Borislav Petkovc02f48e2019-04-05 06:28:11 +02001338 DO NOT USE THIS! This is the ancient /dev/cpu/microcode interface
1339 which was used by userspace tools like iucode_tool and microcode.ctl.
1340 It is inadequate because it runs too late to be able to properly
1341 load microcode on a machine and it needs special tools. Instead, you
1342 should've switched to the early loading method with the initrd or
Mauro Carvalho Chehabcb1aaeb2019-06-07 15:54:32 -03001343 builtin microcode by now: Documentation/x86/microcode.rst
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001344
1345config X86_MSR
1346 tristate "/dev/cpu/*/msr - Model-specific register support"
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001347 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001348 This device gives privileged processes access to the x86
1349 Model-Specific Registers (MSRs). It is a character device with
1350 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
1351 MSR accesses are directed to a specific CPU on multi-processor
1352 systems.
1353
1354config X86_CPUID
1355 tristate "/dev/cpu/*/cpuid - CPU information support"
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001356 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001357 This device gives processes access to the x86 CPUID instruction to
1358 be executed on a specific processor. It is a character device
1359 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
1360 /dev/cpu/31/cpuid.
1361
1362choice
1363 prompt "High Memory Support"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001364 default HIGHMEM4G
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001365 depends on X86_32
1366
1367config NOHIGHMEM
1368 bool "off"
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001369 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001370 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
1371 However, the address space of 32-bit x86 processors is only 4
1372 Gigabytes large. That means that, if you have a large amount of
1373 physical memory, not all of it can be "permanently mapped" by the
1374 kernel. The physical memory that's not permanently mapped is called
1375 "high memory".
1376
1377 If you are compiling a kernel which will never run on a machine with
1378 more than 1 Gigabyte total physical RAM, answer "off" here (default
1379 choice and suitable for most users). This will result in a "3GB/1GB"
1380 split: 3GB are mapped so that each process sees a 3GB virtual memory
1381 space and the remaining part of the 4GB virtual memory space is used
1382 by the kernel to permanently map as much physical memory as
1383 possible.
1384
1385 If the machine has between 1 and 4 Gigabytes physical RAM, then
1386 answer "4GB" here.
1387
1388 If more than 4 Gigabytes is used then answer "64GB" here. This
1389 selection turns Intel PAE (Physical Address Extension) mode on.
1390 PAE implements 3-level paging on IA32 processors. PAE is fully
1391 supported by Linux, PAE mode is implemented on all recent Intel
1392 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
1393 then the kernel will not boot on CPUs that don't support PAE!
1394
1395 The actual amount of total physical memory will either be
1396 auto detected or can be forced by using a kernel command line option
1397 such as "mem=256M". (Try "man bootparam" or see the documentation of
1398 your boot loader (lilo or loadlin) about how to pass options to the
1399 kernel at boot time.)
1400
1401 If unsure, say "off".
1402
1403config HIGHMEM4G
1404 bool "4GB"
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001405 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001406 Select this if you have a 32-bit processor and between 1 and 4
1407 gigabytes of physical RAM.
1408
1409config HIGHMEM64G
1410 bool "64GB"
Lukas Bulwahn225bac22021-08-03 13:35:25 +02001411 depends on !M486SX && !M486 && !M586 && !M586TSC && !M586MMX && !MGEODE_LX && !MGEODEGX1 && !MCYRIXIII && !MELAN && !MWINCHIPC6 && !MWINCHIP3D && !MK6
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001412 select X86_PAE
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001413 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001414 Select this if you have a 32-bit processor and more than 4
1415 gigabytes of physical RAM.
1416
1417endchoice
1418
1419choice
David Rientjes6a108a12011-01-20 14:44:16 -08001420 prompt "Memory split" if EXPERT
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001421 default VMSPLIT_3G
1422 depends on X86_32
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001423 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001424 Select the desired split between kernel and user memory.
1425
1426 If the address range available to the kernel is less than the
1427 physical memory installed, the remaining memory will be available
1428 as "high memory". Accessing high memory is a little more costly
1429 than low memory, as it needs to be mapped into the kernel first.
1430 Note that increasing the kernel address space limits the range
1431 available to user programs, making the address space there
1432 tighter. Selecting anything other than the default 3G/1G split
1433 will also likely make your kernel incompatible with binary-only
1434 kernel modules.
1435
1436 If you are not absolutely sure what you are doing, leave this
1437 option alone!
1438
1439 config VMSPLIT_3G
1440 bool "3G/1G user/kernel split"
1441 config VMSPLIT_3G_OPT
1442 depends on !X86_PAE
1443 bool "3G/1G user/kernel split (for full 1G low memory)"
1444 config VMSPLIT_2G
1445 bool "2G/2G user/kernel split"
1446 config VMSPLIT_2G_OPT
1447 depends on !X86_PAE
1448 bool "2G/2G user/kernel split (for full 2G low memory)"
1449 config VMSPLIT_1G
1450 bool "1G/3G user/kernel split"
1451endchoice
1452
1453config PAGE_OFFSET
1454 hex
1455 default 0xB0000000 if VMSPLIT_3G_OPT
1456 default 0x80000000 if VMSPLIT_2G
1457 default 0x78000000 if VMSPLIT_2G_OPT
1458 default 0x40000000 if VMSPLIT_1G
1459 default 0xC0000000
1460 depends on X86_32
1461
1462config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001463 def_bool y
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001464 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001465
1466config X86_PAE
Jan Beulich9ba16082008-10-15 22:01:38 -07001467 bool "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001468 depends on X86_32 && !HIGHMEM4G
Christoph Hellwigd4a451d2018-04-03 16:24:20 +02001469 select PHYS_ADDR_T_64BIT
Christian Melki9d99c712015-10-05 17:31:33 +02001470 select SWIOTLB
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001471 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001472 PAE is required for NX support, and furthermore enables
1473 larger swapspace support for non-overcommit purposes. It
1474 has the cost of more pagetable lookup overhead, and also
1475 consumes more pagetable space per process.
1476
Kirill A. Shutemov77ef56e2017-07-17 01:59:54 +03001477config X86_5LEVEL
1478 bool "Enable 5-level page tables support"
Kirill A. Shutemov18ec1ea2019-09-13 12:54:52 +03001479 default y
Kirill A. Shutemoveedb92a2018-02-14 14:16:50 +03001480 select DYNAMIC_MEMORY_LAYOUT
Kirill A. Shutemov162434e2018-02-14 14:16:54 +03001481 select SPARSEMEM_VMEMMAP
Kirill A. Shutemov77ef56e2017-07-17 01:59:54 +03001482 depends on X86_64
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001483 help
Kirill A. Shutemov77ef56e2017-07-17 01:59:54 +03001484 5-level paging enables access to larger address space:
1485 upto 128 PiB of virtual address space and 4 PiB of
1486 physical address space.
1487
1488 It will be supported by future Intel CPUs.
1489
Kirill A. Shutemov6657fca2018-02-14 21:25:42 +03001490 A kernel with the option enabled can be booted on machines that
1491 support 4- or 5-level paging.
Kirill A. Shutemov77ef56e2017-07-17 01:59:54 +03001492
Mauro Carvalho Chehabcb1aaeb2019-06-07 15:54:32 -03001493 See Documentation/x86/x86_64/5level-paging.rst for more
Kirill A. Shutemov77ef56e2017-07-17 01:59:54 +03001494 information.
1495
1496 Say N if unsure.
1497
Ingo Molnar10971ab2015-03-05 08:18:23 +01001498config X86_DIRECT_GBPAGES
Luis R. Rodrigueze5008ab2015-03-04 17:24:12 -08001499 def_bool y
Vlastimil Babka2e1da132019-08-07 15:02:58 +02001500 depends on X86_64
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001501 help
Ingo Molnar10971ab2015-03-05 08:18:23 +01001502 Certain kernel features effectively disable kernel
1503 linear 1 GB mappings (even if the CPU otherwise
1504 supports them), so don't confuse the user by printing
1505 that we have them enabled.
Nick Piggin9e899812008-10-22 12:33:16 +02001506
Thomas Gleixner5c280cf2018-09-17 16:29:12 +02001507config X86_CPA_STATISTICS
1508 bool "Enable statistic for Change Page Attribute"
1509 depends on DEBUG_FS
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001510 help
Ingo Molnarb75baaf2019-11-20 15:57:04 +01001511 Expose statistics about the Change Page Attribute mechanism, which
Colin Ian Kinga9432452019-04-16 11:57:51 +01001512 helps to determine the effectiveness of preserving large and huge
Thomas Gleixner5c280cf2018-09-17 16:29:12 +02001513 page mappings when mapping protections are changed.
1514
Kirill A. Shutemov20f07a02021-12-06 16:55:05 +03001515config X86_MEM_ENCRYPT
1516 select ARCH_HAS_FORCE_DMA_UNENCRYPTED
1517 select DYNAMIC_PHYSICAL_MASK
1518 select ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
1519 def_bool n
1520
Tom Lendacky7744ccd2017-07-17 16:10:03 -05001521config AMD_MEM_ENCRYPT
1522 bool "AMD Secure Memory Encryption (SME) support"
1523 depends on X86_64 && CPU_SUP_AMD
David Rientjes82fef0a2020-04-14 17:05:01 -07001524 select DMA_COHERENT_POOL
Ard Biesheuvelce9084b2019-02-02 10:41:17 +01001525 select ARCH_USE_MEMREMAP_PROT
Joerg Roedel597cfe482020-09-07 15:15:24 +02001526 select INSTRUCTION_DECODER
Tom Lendackyaa5a4612021-09-08 17:58:34 -05001527 select ARCH_HAS_CC_PLATFORM
Kirill A. Shutemov20f07a02021-12-06 16:55:05 +03001528 select X86_MEM_ENCRYPT
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001529 help
Tom Lendacky7744ccd2017-07-17 16:10:03 -05001530 Say yes to enable support for the encryption of system memory.
1531 This requires an AMD processor that supports Secure Memory
1532 Encryption (SME).
1533
1534config AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT
1535 bool "Activate AMD Secure Memory Encryption (SME) by default"
Tom Lendacky7744ccd2017-07-17 16:10:03 -05001536 depends on AMD_MEM_ENCRYPT
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001537 help
Tom Lendacky7744ccd2017-07-17 16:10:03 -05001538 Say yes to have system memory encrypted by default if running on
1539 an AMD processor that supports Secure Memory Encryption (SME).
1540
1541 If set to Y, then the encryption of system memory can be
1542 deactivated with the mem_encrypt=off command line option.
1543
1544 If set to N, then the encryption of system memory can be
1545 activated with the mem_encrypt=on command line option.
1546
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001547# Common NUMA Features
1548config NUMA
Randy Dunlape133f6e2019-12-03 16:06:47 -08001549 bool "NUMA Memory Allocation and Scheduler Support"
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001550 depends on SMP
H. Peter Anvinb5660ba2014-02-25 12:14:06 -08001551 depends on X86_64 || (X86_32 && HIGHMEM64G && X86_BIGSMP)
1552 default y if X86_BIGSMP
Kefeng Wang7ecd19c2022-01-19 18:07:41 -08001553 select USE_PERCPU_NUMA_NODE_ID
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001554 help
Randy Dunlape133f6e2019-12-03 16:06:47 -08001555 Enable NUMA (Non-Uniform Memory Access) support.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001556
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001557 The kernel will try to allocate memory used by a CPU on the
1558 local memory controller of the CPU and add some more
1559 NUMA awareness to the kernel.
1560
Ingo Molnarc280ea52008-11-08 13:29:45 +01001561 For 64-bit this is recommended if the system is Intel Core i7
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001562 (or later), AMD Opteron, or EM64T NUMA.
1563
H. Peter Anvinb5660ba2014-02-25 12:14:06 -08001564 For 32-bit this is only needed if you boot a 32-bit
David Rientjes7cf6c942014-02-11 18:11:13 -08001565 kernel on a 64-bit NUMA platform.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001566
1567 Otherwise, you should say N.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001568
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001569config AMD_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001570 def_bool y
1571 prompt "Old style AMD Opteron NUMA detection"
Tejun Heo5da0ef92011-07-11 10:34:32 +02001572 depends on X86_64 && NUMA && PCI
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001573 help
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001574 Enable AMD NUMA node topology detection. You should say Y here if
1575 you have a multi processor AMD system. This uses an old method to
1576 read the NUMA configuration directly from the builtin Northbridge
1577 of Opteron. It is recommended to use X86_64_ACPI_NUMA instead,
1578 which also takes priority if both are compiled in.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001579
1580config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001581 def_bool y
1582 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001583 depends on X86_64 && NUMA && ACPI && PCI
1584 select ACPI_NUMA
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001585 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001586 Enable ACPI SRAT based node topology detection.
1587
1588config NUMA_EMU
1589 bool "NUMA emulation"
Tejun Heo1b7e03e2011-05-02 17:24:48 +02001590 depends on NUMA
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001591 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001592 Enable NUMA emulation. A flat machine will be split
1593 into virtual nodes when booted with "numa=fake=N", where N is the
1594 number of nodes. This is only useful for debugging.
1595
1596config NODES_SHIFT
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001597 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
David Rientjes51591e32010-03-25 15:39:27 -07001598 range 1 10
1599 default "10" if MAXSMP
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001600 default "6" if X86_64
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001601 default "3"
Mike Rapoporta9ee6cf2021-06-28 19:43:01 -07001602 depends on NUMA
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001603 help
Mike Travis1184dc22008-05-12 21:21:12 +02001604 Specify the maximum number of NUMA Nodes available on the target
Matt LaPlante692105b2009-01-26 11:12:25 +01001605 system. Increases memory reserved to accommodate various tables.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001606
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001607config ARCH_FLATMEM_ENABLE
1608 def_bool y
Tejun Heo3b166512011-04-01 11:15:12 +02001609 depends on X86_32 && !NUMA
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001610
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001611config ARCH_SPARSEMEM_ENABLE
1612 def_bool y
Kees Cook6ea30382012-10-02 11:16:47 -07001613 depends on X86_64 || NUMA || X86_32 || X86_32_NON_STANDARD
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001614 select SPARSEMEM_STATIC if X86_32
1615 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1616
Tejun Heo3b166512011-04-01 11:15:12 +02001617config ARCH_SPARSEMEM_DEFAULT
Mike Rapoport6ad57f72019-04-24 16:24:11 +03001618 def_bool X86_64 || (NUMA && X86_32)
Tejun Heo3b166512011-04-01 11:15:12 +02001619
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001620config ARCH_SELECT_MEMORY_MODEL
1621 def_bool y
David Hildenbrand4eda2bc2021-09-29 16:43:21 +02001622 depends on ARCH_SPARSEMEM_ENABLE && ARCH_FLATMEM_ENABLE
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001623
1624config ARCH_MEMORY_PROBE
Toshi Kania0842b72013-07-19 11:47:48 -06001625 bool "Enable sysfs memory/probe interface"
David Hildenbrand5c11f00b2021-11-05 13:44:39 -07001626 depends on MEMORY_HOTPLUG
Toshi Kania0842b72013-07-19 11:47:48 -06001627 help
1628 This option enables a sysfs memory/probe interface for testing.
Mauro Carvalho Chehabcb1aaeb2019-06-07 15:54:32 -03001629 See Documentation/admin-guide/mm/memory-hotplug.rst for more information.
Toshi Kania0842b72013-07-19 11:47:48 -06001630 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001631
Tejun Heo3b166512011-04-01 11:15:12 +02001632config ARCH_PROC_KCORE_TEXT
1633 def_bool y
1634 depends on X86_64 && PROC_KCORE
1635
Avi Kivitya29815a2010-01-10 16:28:09 +02001636config ILLEGAL_POINTER_VALUE
Krzysztof Kozlowskib03b0162019-11-21 04:21:09 +01001637 hex
1638 default 0 if X86_32
1639 default 0xdead000000000000 if X86_64
Avi Kivitya29815a2010-01-10 16:28:09 +02001640
Dan Williams7a678322015-08-19 00:34:34 -04001641config X86_PMEM_LEGACY_DEVICE
1642 bool
1643
Christoph Hellwigec776ef2015-04-01 09:12:18 +02001644config X86_PMEM_LEGACY
Dan Williams7a678322015-08-19 00:34:34 -04001645 tristate "Support non-standard NVDIMMs and ADR protected memory"
Dan Williams9f53f9f2015-06-09 15:33:45 -04001646 depends on PHYS_ADDR_T_64BIT
1647 depends on BLK_DEV
Dan Williams7a678322015-08-19 00:34:34 -04001648 select X86_PMEM_LEGACY_DEVICE
Dan Williams7b27a862020-02-16 12:01:16 -08001649 select NUMA_KEEP_MEMINFO if NUMA
Dan Williams9f53f9f2015-06-09 15:33:45 -04001650 select LIBNVDIMM
Christoph Hellwigec776ef2015-04-01 09:12:18 +02001651 help
1652 Treat memory marked using the non-standard e820 type of 12 as used
1653 by the Intel Sandy Bridge-EP reference BIOS as protected memory.
1654 The kernel will offer these regions to the 'pmem' driver so
1655 they can be used for persistent storage.
1656
1657 Say Y if unsure.
1658
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001659config HIGHPTE
1660 bool "Allocate 3rd-level pagetables from highmem"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001661 depends on HIGHMEM
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001662 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001663 The VM uses one page table entry for each page of physical memory.
1664 For systems with a lot of RAM, this can be wasteful of precious
1665 low memory. Setting this option will put user-space page table
1666 entries in high memory.
1667
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001668config X86_CHECK_BIOS_CORRUPTION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001669 bool "Check for low memory corruption"
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001670 help
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001671 Periodically check for memory corruption in low memory, which
1672 is suspected to be caused by BIOS. Even when enabled in the
1673 configuration, it is disabled at runtime. Enable it by
1674 setting "memory_corruption_check=1" on the kernel command
1675 line. By default it scans the low 64k of memory every 60
1676 seconds; see the memory_corruption_check_size and
1677 memory_corruption_check_period parameters in
Mauro Carvalho Chehab8c27ceff32016-10-18 10:12:27 -02001678 Documentation/admin-guide/kernel-parameters.rst to adjust this.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001679
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001680 When enabled with the default parameters, this option has
1681 almost no overhead, as it reserves a relatively small amount
1682 of memory and scans it infrequently. It both detects corruption
1683 and prevents it from affecting the running system.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001684
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001685 It is, however, intended as a diagnostic tool; if repeatable
1686 BIOS-originated corruption always affects the same memory,
1687 you can use memmap= to prevent the kernel from using that
1688 memory.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001689
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001690config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001691 bool "Set the default setting of memory_corruption_check"
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001692 depends on X86_CHECK_BIOS_CORRUPTION
1693 default y
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001694 help
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001695 Set whether the default state of memory_corruption_check is
1696 on or off.
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001697
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001698config MATH_EMULATION
1699 bool
Andy Lutomirskia5b9e5a2015-07-30 14:31:34 -07001700 depends on MODIFY_LDT_SYSCALL
Arnd Bergmann87d60212019-10-01 16:23:35 +02001701 prompt "Math emulation" if X86_32 && (M486SX || MELAN)
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001702 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001703 Linux can emulate a math coprocessor (used for floating point
1704 operations) if you don't have one. 486DX and Pentium processors have
1705 a math coprocessor built in, 486SX and 386 do not, unless you added
1706 a 487DX or 387, respectively. (The messages during boot time can
1707 give you some hints here ["man dmesg"].) Everyone needs either a
1708 coprocessor or this emulation.
1709
1710 If you don't have a math coprocessor, you need to say Y here; if you
1711 say Y here even though you have a coprocessor, the coprocessor will
1712 be used nevertheless. (This behavior can be changed with the kernel
1713 command line option "no387", which comes handy if your coprocessor
1714 is broken. Try "man bootparam" or see the documentation of your boot
1715 loader (lilo or loadlin) about how to pass options to the kernel at
1716 boot time.) This means that it is a good idea to say Y here if you
1717 intend to use this kernel on different machines.
1718
1719 More information about the internals of the Linux math coprocessor
1720 emulation can be found in <file:arch/x86/math-emu/README>.
1721
1722 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1723 kernel, it won't hurt.
1724
1725config MTRR
Jan Beulich6fc108a2010-04-21 15:23:44 +01001726 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001727 prompt "MTRR (Memory Type Range Register) support" if EXPERT
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001728 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001729 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1730 the Memory Type Range Registers (MTRRs) may be used to control
1731 processor access to memory ranges. This is most useful if you have
1732 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1733 allows bus write transfers to be combined into a larger transfer
1734 before bursting over the PCI/AGP bus. This can increase performance
1735 of image write operations 2.5 times or more. Saying Y here creates a
1736 /proc/mtrr file which may be used to manipulate your processor's
1737 MTRRs. Typically the X server should use this.
1738
1739 This code has a reasonably generic interface so that similar
1740 control registers on other processors can be easily supported
1741 as well:
1742
1743 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1744 Registers (ARRs) which provide a similar functionality to MTRRs. For
1745 these, the ARRs are used to emulate the MTRRs.
1746 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1747 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1748 write-combining. All of these processors are supported by this code
1749 and it makes sense to say Y here if you have one of them.
1750
1751 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1752 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1753 can lead to all sorts of problems, so it's good to say Y here.
1754
1755 You can safely say Y even if your machine doesn't have MTRRs, you'll
1756 just add about 9 KB to your kernel.
1757
Mauro Carvalho Chehabcb1aaeb2019-06-07 15:54:32 -03001758 See <file:Documentation/x86/mtrr.rst> for more information.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001759
Yinghai Lu95ffa242008-04-29 03:52:33 -07001760config MTRR_SANITIZER
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001761 def_bool y
Yinghai Lu95ffa242008-04-29 03:52:33 -07001762 prompt "MTRR cleanup support"
1763 depends on MTRR
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001764 help
Thomas Gleixneraba37282008-07-15 14:48:48 +02001765 Convert MTRR layout from continuous to discrete, so X drivers can
1766 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001767
Thomas Gleixneraba37282008-07-15 14:48:48 +02001768 Can be disabled with disable_mtrr_cleanup on the kernel command line.
Matt LaPlante692105b2009-01-26 11:12:25 +01001769 The largest mtrr entry size for a continuous block can be set with
Thomas Gleixneraba37282008-07-15 14:48:48 +02001770 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001771
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001772 If unsure, say Y.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001773
1774config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001775 int "MTRR cleanup enable value (0-1)"
1776 range 0 1
1777 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001778 depends on MTRR_SANITIZER
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001779 help
Yinghai Luf5098d62008-04-29 20:25:58 -07001780 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001781
Yinghai Lu12031a62008-05-02 02:40:22 -07001782config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1783 int "MTRR cleanup spare reg num (0-7)"
1784 range 0 7
1785 default "1"
1786 depends on MTRR_SANITIZER
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001787 help
Yinghai Lu12031a62008-05-02 02:40:22 -07001788 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001789 mtrr_spare_reg_nr=N on the kernel command line.
Yinghai Lu12031a62008-05-02 02:40:22 -07001790
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001791config X86_PAT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001792 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001793 prompt "x86 PAT support" if EXPERT
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001794 depends on MTRR
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001795 help
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001796 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001797
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001798 PATs are the modern equivalents of MTRRs and are much more
1799 flexible than MTRRs.
1800
1801 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001802 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001803
1804 If unsure, say Y.
1805
Venkatesh Pallipadi46cf98c2009-07-10 09:57:37 -07001806config ARCH_USES_PG_UNCACHED
1807 def_bool y
1808 depends on X86_PAT
1809
H. Peter Anvin628c6242011-07-31 13:59:29 -07001810config ARCH_RANDOM
1811 def_bool y
1812 prompt "x86 architectural random number generator" if EXPERT
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001813 help
H. Peter Anvin628c6242011-07-31 13:59:29 -07001814 Enable the x86 architectural RDRAND instruction
1815 (Intel Bull Mountain technology) to generate random numbers.
1816 If supported, this is a high bandwidth, cryptographically
1817 secure hardware random number generator.
1818
H. Peter Anvin51ae4a22012-09-21 12:43:10 -07001819config X86_SMAP
1820 def_bool y
1821 prompt "Supervisor Mode Access Prevention" if EXPERT
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001822 help
H. Peter Anvin51ae4a22012-09-21 12:43:10 -07001823 Supervisor Mode Access Prevention (SMAP) is a security
1824 feature in newer Intel processors. There is a small
1825 performance cost if this enabled and turned on; there is
1826 also a small increase in the kernel size if this is enabled.
1827
1828 If unsure, say Y.
1829
Babu Mogerb9718802019-11-05 21:25:32 +00001830config X86_UMIP
Ricardo Neri796ebc82017-11-13 22:29:42 -08001831 def_bool y
Babu Mogerb9718802019-11-05 21:25:32 +00001832 prompt "User Mode Instruction Prevention" if EXPERT
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001833 help
Babu Mogerb9718802019-11-05 21:25:32 +00001834 User Mode Instruction Prevention (UMIP) is a security feature in
1835 some x86 processors. If enabled, a general protection fault is
1836 issued if the SGDT, SLDT, SIDT, SMSW or STR instructions are
1837 executed in user mode. These instructions unnecessarily expose
1838 information about the hardware state.
Ricardo Neri796ebc82017-11-13 22:29:42 -08001839
1840 The vast majority of applications do not use these instructions.
1841 For the very few that do, software emulation is provided in
1842 specific cases in protected and virtual-8086 modes. Emulated
1843 results are dummy.
Ricardo Neriaa35f892017-11-05 18:27:54 -08001844
Peter Zijlstra156ff4a2022-03-08 16:30:17 +01001845config CC_HAS_IBT
1846 # GCC >= 9 and binutils >= 2.29
1847 # Retpoline check to work around https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93654
1848 # Clang/LLVM >= 14
Nathan Chancellor262448f2022-03-18 16:07:46 -07001849 # https://github.com/llvm/llvm-project/commit/e0b89df2e0f0130881bf6c39bf31d7f6aac00e0f
1850 # https://github.com/llvm/llvm-project/commit/dfcf69770bc522b9e411c66454934a37c1f35332
Peter Zijlstra156ff4a2022-03-08 16:30:17 +01001851 def_bool ((CC_IS_GCC && $(cc-option, -fcf-protection=branch -mindirect-branch-register)) || \
Nathan Chancellor262448f2022-03-18 16:07:46 -07001852 (CC_IS_CLANG && CLANG_VERSION >= 140000)) && \
Peter Zijlstra156ff4a2022-03-08 16:30:17 +01001853 $(as-instr,endbr64)
1854
1855config X86_KERNEL_IBT
1856 prompt "Indirect Branch Tracking"
1857 bool
Peter Zijlstraed53a0d2022-03-08 16:30:56 +01001858 depends on X86_64 && CC_HAS_IBT && STACK_VALIDATION
Nathan Chancellorf6a2c2b2022-03-18 16:07:47 -07001859 # https://github.com/llvm/llvm-project/commit/9d7001eba9c4cb311e03cd8cdc231f9e579f2d0f
1860 depends on !LD_IS_LLD || LLD_VERSION >= 140000
Peter Zijlstra156ff4a2022-03-08 16:30:17 +01001861 help
1862 Build the kernel with support for Indirect Branch Tracking, a
1863 hardware support course-grain forward-edge Control Flow Integrity
1864 protection. It enforces that all indirect calls must land on
1865 an ENDBR instruction, as such, the compiler will instrument the
1866 code with them to make this happen.
1867
Peter Zijlstraed53a0d2022-03-08 16:30:56 +01001868 In addition to building the kernel with IBT, seal all functions that
1869 are not indirect call targets, avoiding them ever becomming one.
1870
1871 This requires LTO like objtool runs and will slow down the build. It
1872 does significantly reduce the number of ENDBR instructions in the
1873 kernel image.
1874
Dave Hansen35e97792016-02-12 13:02:00 -08001875config X86_INTEL_MEMORY_PROTECTION_KEYS
Babu Moger38f3e772020-05-28 11:08:23 -05001876 prompt "Memory Protection Keys"
Dave Hansen35e97792016-02-12 13:02:00 -08001877 def_bool y
Dave Hansen284244a2016-02-12 13:02:28 -08001878 # Note: only available in 64-bit mode
Babu Moger38f3e772020-05-28 11:08:23 -05001879 depends on X86_64 && (CPU_SUP_INTEL || CPU_SUP_AMD)
Ingo Molnar52c8e602016-11-15 10:15:03 +01001880 select ARCH_USES_HIGH_VMA_FLAGS
1881 select ARCH_HAS_PKEYS
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001882 help
Dave Hansen284244a2016-02-12 13:02:28 -08001883 Memory Protection Keys provides a mechanism for enforcing
1884 page-based protections, but without requiring modification of the
1885 page tables when an application changes protection domains.
1886
Mauro Carvalho Chehab1eecbcd2019-06-07 15:54:31 -03001887 For details, see Documentation/core-api/protection-keys.rst
Dave Hansen284244a2016-02-12 13:02:28 -08001888
1889 If unsure, say y.
Dave Hansen35e97792016-02-12 13:02:00 -08001890
Michal Hockodb616172019-10-23 12:35:50 +02001891choice
1892 prompt "TSX enable mode"
1893 depends on CPU_SUP_INTEL
1894 default X86_INTEL_TSX_MODE_OFF
1895 help
1896 Intel's TSX (Transactional Synchronization Extensions) feature
1897 allows to optimize locking protocols through lock elision which
1898 can lead to a noticeable performance boost.
1899
1900 On the other hand it has been shown that TSX can be exploited
1901 to form side channel attacks (e.g. TAA) and chances are there
1902 will be more of those attacks discovered in the future.
1903
1904 Therefore TSX is not enabled by default (aka tsx=off). An admin
1905 might override this decision by tsx=on the command line parameter.
1906 Even with TSX enabled, the kernel will attempt to enable the best
1907 possible TAA mitigation setting depending on the microcode available
1908 for the particular machine.
1909
1910 This option allows to set the default tsx mode between tsx=on, =off
1911 and =auto. See Documentation/admin-guide/kernel-parameters.txt for more
1912 details.
1913
1914 Say off if not sure, auto if TSX is in use but it should be used on safe
1915 platforms or on if TSX is in use and the security aspect of tsx is not
1916 relevant.
1917
1918config X86_INTEL_TSX_MODE_OFF
1919 bool "off"
1920 help
1921 TSX is disabled if possible - equals to tsx=off command line parameter.
1922
1923config X86_INTEL_TSX_MODE_ON
1924 bool "on"
1925 help
1926 TSX is always enabled on TSX capable HW - equals the tsx=on command
1927 line parameter.
1928
1929config X86_INTEL_TSX_MODE_AUTO
1930 bool "auto"
1931 help
1932 TSX is enabled on TSX capable HW that is believed to be safe against
1933 side channel attacks- equals the tsx=auto command line parameter.
1934endchoice
1935
Sean Christophersone7e05452020-11-13 00:01:16 +02001936config X86_SGX
1937 bool "Software Guard eXtensions (SGX)"
1938 depends on X86_64 && CPU_SUP_INTEL
1939 depends on CRYPTO=y
1940 depends on CRYPTO_SHA256=y
1941 select SRCU
1942 select MMU_NOTIFIER
Jarkko Sakkinen901ddbb2021-03-18 01:53:31 +02001943 select NUMA_KEEP_MEMINFO if NUMA
Tony Luck40e0e782021-10-26 15:00:45 -07001944 select XARRAY_MULTI
Sean Christophersone7e05452020-11-13 00:01:16 +02001945 help
1946 Intel(R) Software Guard eXtensions (SGX) is a set of CPU instructions
1947 that can be used by applications to set aside private regions of code
1948 and data, referred to as enclaves. An enclave's private memory can
1949 only be accessed by code running within the enclave. Accesses from
1950 outside the enclave, including other enclaves, are disallowed by
1951 hardware.
1952
1953 If unsure, say N.
1954
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001955config EFI
Jan Beulich9ba16082008-10-15 22:01:38 -07001956 bool "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001957 depends on ACPI
Sergey Vlasovf6ce5002013-04-16 18:31:08 +04001958 select UCS2_STRING
Ard Biesheuvel022ee6c2014-06-26 12:09:05 +02001959 select EFI_RUNTIME_WRAPPERS
Tom Lendacky1ff2fc02021-10-20 13:02:11 -05001960 select ARCH_USE_MEMREMAP_PROT
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001961 help
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001962 This enables the kernel to use EFI runtime services that are
1963 available (such as the EFI variable services).
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001964
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001965 This option is only useful on systems that have EFI firmware.
1966 In addition, you should use the latest ELILO loader available
1967 at <http://elilo.sourceforge.net> in order to take advantage
1968 of EFI runtime services. However, even with this option, the
1969 resultant kernel should continue to boot on existing non-EFI
1970 platforms.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001971
Matt Fleming291f3632011-12-12 21:27:52 +00001972config EFI_STUB
Ard Biesheuvel8f24f8c2019-12-24 16:10:12 +01001973 bool "EFI stub support"
Peter Zijlstrac6dbd3e2021-11-15 17:46:39 +01001974 depends on EFI
Ard Biesheuvel8f24f8c2019-12-24 16:10:12 +01001975 depends on $(cc-option,-mabi=ms) || X86_32
1976 select RELOCATABLE
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001977 help
Ard Biesheuvel8f24f8c2019-12-24 16:10:12 +01001978 This kernel feature allows a bzImage to be loaded directly
Matt Fleming291f3632011-12-12 21:27:52 +00001979 by EFI firmware without the use of a bootloader.
1980
Mauro Carvalho Chehab4f4cfa62019-06-27 14:56:51 -03001981 See Documentation/admin-guide/efi-stub.rst for more information.
Matt Fleming0c759662012-03-16 12:03:13 +00001982
Matt Fleming7d453ee2014-01-10 18:52:06 +00001983config EFI_MIXED
1984 bool "EFI mixed-mode support"
1985 depends on EFI_STUB && X86_64
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09001986 help
Matt Fleming7d453ee2014-01-10 18:52:06 +00001987 Enabling this feature allows a 64-bit kernel to be booted
1988 on a 32-bit firmware, provided that your CPU supports 64-bit
1989 mode.
1990
1991 Note that it is not possible to boot a mixed-mode enabled
1992 kernel via the EFI boot stub - a bootloader that supports
1993 the EFI handover protocol must be used.
1994
1995 If unsure, say N.
1996
Masahiro Yamada8636a1f2018-12-11 20:01:04 +09001997source "kernel/Kconfig.hz"
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001998
1999config KEXEC
2000 bool "kexec system call"
Dave Young2965faa2015-09-09 15:38:55 -07002001 select KEXEC_CORE
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002002 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002003 kexec is a system call that implements the ability to shutdown your
2004 current kernel, and to start another kernel. It is like a reboot
2005 but it is independent of the system firmware. And like a reboot
2006 you can start any kernel with it, not just Linux.
2007
2008 The name comes from the similarity to the exec system call.
2009
2010 It is an ongoing process to be certain the hardware in a machine
2011 is properly shutdown, so do not be surprised if this code does not
Geert Uytterhoevenbf220692013-08-20 21:38:03 +02002012 initially work for you. As of this writing the exact hardware
2013 interface is strongly in flux, so no good recommendation can be
2014 made.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002015
Vivek Goyal74ca3172014-08-29 15:18:46 -07002016config KEXEC_FILE
2017 bool "kexec file based system call"
Dave Young2965faa2015-09-09 15:38:55 -07002018 select KEXEC_CORE
Vivek Goyal74ca3172014-08-29 15:18:46 -07002019 select BUILD_BIN2C
Vivek Goyal74ca3172014-08-29 15:18:46 -07002020 depends on X86_64
2021 depends on CRYPTO=y
2022 depends on CRYPTO_SHA256=y
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002023 help
Vivek Goyal74ca3172014-08-29 15:18:46 -07002024 This is new version of kexec system call. This system call is
2025 file based and takes file descriptors as system call argument
2026 for kernel and initramfs as opposed to list of segments as
2027 accepted by previous system call.
2028
AKASHI Takahirob799a092018-04-13 15:35:45 -07002029config ARCH_HAS_KEXEC_PURGATORY
2030 def_bool KEXEC_FILE
2031
Jiri Bohac99d5cadf2019-08-19 17:17:44 -07002032config KEXEC_SIG
Vivek Goyal8e7d8382014-08-08 14:26:13 -07002033 bool "Verify kernel signature during kexec_file_load() syscall"
Vivek Goyal74ca3172014-08-29 15:18:46 -07002034 depends on KEXEC_FILE
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002035 help
Jiri Bohac99d5cadf2019-08-19 17:17:44 -07002036
2037 This option makes the kexec_file_load() syscall check for a valid
2038 signature of the kernel image. The image can still be loaded without
2039 a valid signature unless you also enable KEXEC_SIG_FORCE, though if
2040 there's a signature that we can check, then it must be valid.
2041
2042 In addition to this option, you need to enable signature
2043 verification for the corresponding kernel image type being
2044 loaded in order for this to work.
2045
2046config KEXEC_SIG_FORCE
2047 bool "Require a valid signature in kexec_file_load() syscall"
2048 depends on KEXEC_SIG
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002049 help
Vivek Goyal8e7d8382014-08-08 14:26:13 -07002050 This option makes kernel signature verification mandatory for
Borislav Petkovd8eb8942015-03-13 14:04:37 +01002051 the kexec_file_load() syscall.
Vivek Goyal8e7d8382014-08-08 14:26:13 -07002052
Vivek Goyal8e7d8382014-08-08 14:26:13 -07002053config KEXEC_BZIMAGE_VERIFY_SIG
2054 bool "Enable bzImage signature verification support"
Jiri Bohac99d5cadf2019-08-19 17:17:44 -07002055 depends on KEXEC_SIG
Vivek Goyal8e7d8382014-08-08 14:26:13 -07002056 depends on SIGNED_PE_FILE_VERIFICATION
2057 select SYSTEM_TRUSTED_KEYRING
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002058 help
Vivek Goyal8e7d8382014-08-08 14:26:13 -07002059 Enable bzImage signature verification support.
2060
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002061config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02002062 bool "kernel crash dumps"
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002063 depends on X86_64 || (X86_32 && HIGHMEM)
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002064 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002065 Generate crash dump after being started by kexec.
2066 This should be normally only set in special crash dump kernels
2067 which are loaded in the main kernel with kexec-tools into
2068 a specially reserved region and then later executed after
2069 a crash by kdump/kexec. The crash dump kernel must be compiled
2070 to a memory address not used by the main kernel or BIOS using
2071 PHYSICAL_START, or it must be built as a relocatable image
2072 (CONFIG_RELOCATABLE=y).
Mauro Carvalho Chehab330d4812019-06-13 15:21:39 -03002073 For more details see Documentation/admin-guide/kdump/kdump.rst
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002074
Huang Ying3ab83522008-07-25 19:45:07 -07002075config KEXEC_JUMP
Kees Cook6ea30382012-10-02 11:16:47 -07002076 bool "kexec jump"
Huang Yingfee7b0d2009-03-10 10:57:16 +08002077 depends on KEXEC && HIBERNATION
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002078 help
Huang Ying89081d12008-07-25 19:45:10 -07002079 Jump between original kernel and kexeced kernel and invoke
2080 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07002081
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002082config PHYSICAL_START
David Rientjes6a108a12011-01-20 14:44:16 -08002083 hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
H. Peter Anvinceefccc2009-05-11 16:12:16 -07002084 default "0x1000000"
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002085 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002086 This gives the physical address where the kernel is loaded.
2087
2088 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
2089 bzImage will decompress itself to above physical address and
2090 run from there. Otherwise, bzImage will run from the address where
2091 it has been loaded by the boot loader and will ignore above physical
2092 address.
2093
2094 In normal kdump cases one does not have to set/change this option
2095 as now bzImage can be compiled as a completely relocatable image
2096 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
2097 address. This option is mainly useful for the folks who don't want
2098 to use a bzImage for capturing the crash dump and want to use a
2099 vmlinux instead. vmlinux is not relocatable hence a kernel needs
2100 to be specifically compiled to run from a specific memory area
2101 (normally a reserved region) and this option comes handy.
2102
H. Peter Anvinceefccc2009-05-11 16:12:16 -07002103 So if you are using bzImage for capturing the crash dump,
2104 leave the value here unchanged to 0x1000000 and set
2105 CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
2106 for capturing the crash dump change this value to start of
2107 the reserved region. In other words, it can be set based on
2108 the "X" value as specified in the "crashkernel=YM@XM"
2109 command line boot parameter passed to the panic-ed
Mauro Carvalho Chehab330d4812019-06-13 15:21:39 -03002110 kernel. Please take a look at Documentation/admin-guide/kdump/kdump.rst
H. Peter Anvinceefccc2009-05-11 16:12:16 -07002111 for more details about crash dumps.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002112
2113 Usage of bzImage for capturing the crash dump is recommended as
2114 one does not have to build two kernels. Same kernel can be used
2115 as production kernel and capture kernel. Above option should have
2116 gone away after relocatable bzImage support is introduced. But it
2117 is present because there are users out there who continue to use
2118 vmlinux for dump capture. This option should go away down the
2119 line.
2120
2121 Don't change this unless you know what you are doing.
2122
2123config RELOCATABLE
H. Peter Anvin26717802009-05-07 14:19:34 -07002124 bool "Build a relocatable kernel"
2125 default y
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002126 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002127 This builds a kernel image that retains relocation information
2128 so it can be loaded someplace besides the default 1MB.
2129 The relocations tend to make the kernel binary about 10% larger,
2130 but are discarded at runtime.
2131
2132 One use is for the kexec on panic case where the recovery kernel
2133 must live at a different physical address than the primary
2134 kernel.
2135
2136 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
2137 it has been loaded at and the compile time physical address
Kees Cook8ab38202013-10-10 17:18:14 -07002138 (CONFIG_PHYSICAL_START) is used as the minimum location.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002139
Kees Cook8ab38202013-10-10 17:18:14 -07002140config RANDOMIZE_BASE
Baoquan Hee8581e32016-04-20 13:55:43 -07002141 bool "Randomize the address of the kernel image (KASLR)"
Kees Cook8ab38202013-10-10 17:18:14 -07002142 depends on RELOCATABLE
Ingo Molnar6807c842017-04-18 11:08:12 +02002143 default y
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002144 help
Baoquan Hee8581e32016-04-20 13:55:43 -07002145 In support of Kernel Address Space Layout Randomization (KASLR),
2146 this randomizes the physical address at which the kernel image
2147 is decompressed and the virtual address where the kernel
2148 image is mapped, as a security feature that deters exploit
2149 attempts relying on knowledge of the location of kernel
2150 code internals.
Kees Cook8ab38202013-10-10 17:18:14 -07002151
Kees Cooked9f0072016-05-25 15:45:33 -07002152 On 64-bit, the kernel physical and virtual addresses are
2153 randomized separately. The physical address will be anywhere
2154 between 16MB and the top of physical memory (up to 64TB). The
2155 virtual address will be randomized from 16MB up to 1GB (9 bits
2156 of entropy). Note that this also reduces the memory space
2157 available to kernel modules from 1.5GB to 1GB.
2158
2159 On 32-bit, the kernel physical and virtual addresses are
2160 randomized together. They will be randomized from 16MB up to
2161 512MB (8 bits of entropy).
Kees Cook8ab38202013-10-10 17:18:14 -07002162
Baoquan Hee8581e32016-04-20 13:55:43 -07002163 Entropy is generated using the RDRAND instruction if it is
2164 supported. If RDTSC is supported, its value is mixed into
2165 the entropy pool as well. If neither RDRAND nor RDTSC are
Kees Cooked9f0072016-05-25 15:45:33 -07002166 supported, then entropy is read from the i8254 timer. The
2167 usable entropy is limited by the kernel being built using
2168 2GB addressing, and that PHYSICAL_ALIGN must be at a
2169 minimum of 2MB. As a result, only 10 bits of entropy are
2170 theoretically possible, but the implementations are further
2171 limited due to memory layouts.
Kees Cookda2b6fb2013-12-10 12:27:45 -08002172
Ingo Molnar6807c842017-04-18 11:08:12 +02002173 If unsure, say Y.
Kees Cook8ab38202013-10-10 17:18:14 -07002174
2175# Relocation on x86 needs some additional build support
H. Peter Anvin845adf72009-05-05 21:20:51 -07002176config X86_NEED_RELOCS
2177 def_bool y
Kees Cook8ab38202013-10-10 17:18:14 -07002178 depends on RANDOMIZE_BASE || (X86_32 && RELOCATABLE)
H. Peter Anvin845adf72009-05-05 21:20:51 -07002179
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002180config PHYSICAL_ALIGN
Kees Cooka0215062013-07-08 09:15:17 -07002181 hex "Alignment value to which kernel should be aligned"
Kees Cook8ab38202013-10-10 17:18:14 -07002182 default "0x200000"
Kees Cooka0215062013-07-08 09:15:17 -07002183 range 0x2000 0x1000000 if X86_32
2184 range 0x200000 0x1000000 if X86_64
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002185 help
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002186 This value puts the alignment restrictions on physical address
2187 where kernel is loaded and run from. Kernel is compiled for an
2188 address which meets above alignment restriction.
2189
2190 If bootloader loads the kernel at a non-aligned address and
2191 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
2192 address aligned to above value and run from there.
2193
2194 If bootloader loads the kernel at a non-aligned address and
2195 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
2196 load address and decompress itself to the address it has been
2197 compiled for and run from there. The address for which kernel is
2198 compiled already meets above alignment restrictions. Hence the
2199 end result is that kernel runs from a physical address meeting
2200 above alignment restrictions.
2201
Kees Cooka0215062013-07-08 09:15:17 -07002202 On 32-bit this value must be a multiple of 0x2000. On 64-bit
2203 this value must be a multiple of 0x200000.
2204
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002205 Don't change this unless you know what you are doing.
2206
Kirill A. Shutemoveedb92a2018-02-14 14:16:50 +03002207config DYNAMIC_MEMORY_LAYOUT
2208 bool
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002209 help
Kirill A. Shutemoveedb92a2018-02-14 14:16:50 +03002210 This option makes base addresses of vmalloc and vmemmap as well as
2211 __PAGE_OFFSET movable during boot.
2212
Thomas Garnier0483e1f2016-06-21 17:47:02 -07002213config RANDOMIZE_MEMORY
2214 bool "Randomize the kernel memory sections"
2215 depends on X86_64
2216 depends on RANDOMIZE_BASE
Kirill A. Shutemoveedb92a2018-02-14 14:16:50 +03002217 select DYNAMIC_MEMORY_LAYOUT
Thomas Garnier0483e1f2016-06-21 17:47:02 -07002218 default RANDOMIZE_BASE
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002219 help
Thomas Garnier0483e1f2016-06-21 17:47:02 -07002220 Randomizes the base virtual address of kernel memory sections
2221 (physical memory mapping, vmalloc & vmemmap). This security feature
2222 makes exploits relying on predictable memory locations less reliable.
2223
2224 The order of allocations remains unchanged. Entropy is generated in
2225 the same way as RANDOMIZE_BASE. Current implementation in the optimal
2226 configuration have in average 30,000 different possible virtual
2227 addresses for each memory section.
2228
Ingo Molnar6807c842017-04-18 11:08:12 +02002229 If unsure, say Y.
Thomas Garnier0483e1f2016-06-21 17:47:02 -07002230
Thomas Garnier90397a42016-06-21 17:47:06 -07002231config RANDOMIZE_MEMORY_PHYSICAL_PADDING
2232 hex "Physical memory mapping padding" if EXPERT
2233 depends on RANDOMIZE_MEMORY
2234 default "0xa" if MEMORY_HOTPLUG
2235 default "0x0"
2236 range 0x1 0x40 if MEMORY_HOTPLUG
2237 range 0x0 0x40
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002238 help
Thomas Garnier90397a42016-06-21 17:47:06 -07002239 Define the padding in terabytes added to the existing physical
2240 memory size during kernel memory randomization. It is useful
2241 for memory hotplug support but reduces the entropy available for
2242 address randomization.
2243
2244 If unsure, leave at the default value.
2245
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002246config HOTPLUG_CPU
Thomas Gleixnerbebd0242019-03-26 17:36:06 +01002247 def_bool y
Stephen Rothwell40b31362013-05-21 13:49:35 +10002248 depends on SMP
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002249
Fenghua Yu80aa1df2012-11-13 11:32:39 -08002250config BOOTPARAM_HOTPLUG_CPU0
2251 bool "Set default setting of cpu0_hotpluggable"
Kees Cook2c922cd2013-01-22 13:01:19 -08002252 depends on HOTPLUG_CPU
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002253 help
Fenghua Yu80aa1df2012-11-13 11:32:39 -08002254 Set whether default state of cpu0_hotpluggable is on or off.
2255
2256 Say Y here to enable CPU0 hotplug by default. If this switch
2257 is turned on, there is no need to give cpu0_hotplug kernel
2258 parameter and the CPU0 hotplug feature is enabled by default.
2259
2260 Please note: there are two known CPU0 dependencies if you want
2261 to enable the CPU0 hotplug feature either by this switch or by
2262 cpu0_hotplug kernel parameter.
2263
2264 First, resume from hibernate or suspend always starts from CPU0.
2265 So hibernate and suspend are prevented if CPU0 is offline.
2266
2267 Second dependency is PIC interrupts always go to CPU0. CPU0 can not
2268 offline if any interrupt can not migrate out of CPU0. There may
2269 be other CPU0 dependencies.
2270
2271 Please make sure the dependencies are under your control before
2272 you enable this feature.
2273
2274 Say N if you don't want to enable CPU0 hotplug feature by default.
2275 You still can enable the CPU0 hotplug feature at boot by kernel
2276 parameter cpu0_hotplug.
2277
Fenghua Yua71c8bc2012-11-13 11:32:51 -08002278config DEBUG_HOTPLUG_CPU0
2279 def_bool n
2280 prompt "Debug CPU0 hotplug"
Kees Cook2c922cd2013-01-22 13:01:19 -08002281 depends on HOTPLUG_CPU
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002282 help
Fenghua Yua71c8bc2012-11-13 11:32:51 -08002283 Enabling this option offlines CPU0 (if CPU0 can be offlined) as
2284 soon as possible and boots up userspace with CPU0 offlined. User
2285 can online CPU0 back after boot time.
2286
2287 To debug CPU0 hotplug, you need to enable CPU0 offline/online
2288 feature by either turning on CONFIG_BOOTPARAM_HOTPLUG_CPU0 during
2289 compilation or giving cpu0_hotplug kernel parameter at boot.
2290
2291 If unsure, say N.
2292
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002293config COMPAT_VDSO
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07002294 def_bool n
2295 prompt "Disable the 32-bit vDSO (needed for glibc 2.3.3)"
Ingo Molnar953fee12016-11-15 10:22:52 +01002296 depends on COMPAT_32
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002297 help
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07002298 Certain buggy versions of glibc will crash if they are
2299 presented with a 32-bit vDSO that is not mapped at the address
2300 indicated in its segment table.
Randy Dunlape84446d2009-11-10 15:46:52 -08002301
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07002302 The bug was introduced by f866314b89d56845f55e6f365e18b31ec978ec3a
2303 and fixed by 3b3ddb4f7db98ec9e912ccdf54d35df4aa30e04a and
2304 49ad572a70b8aeb91e57483a11dd1b77e31c4468. Glibc 2.3.3 is
2305 the only released version with the bug, but OpenSUSE 9
2306 contains a buggy "glibc 2.3.2".
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002307
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07002308 The symptom of the bug is that everything crashes on startup, saying:
2309 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
2310
2311 Saying Y here changes the default value of the vdso32 boot
2312 option from 1 to 0, which turns off the 32-bit vDSO entirely.
2313 This works around the glibc bug but hurts performance.
2314
2315 If unsure, say N: if you are compiling your own kernel, you
2316 are unlikely to be using a buggy version of glibc.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002317
Kees Cook3dc33bd2015-08-12 17:55:19 -07002318choice
2319 prompt "vsyscall table for legacy applications"
2320 depends on X86_64
Andy Lutomirski625b7b72019-06-26 21:45:07 -07002321 default LEGACY_VSYSCALL_XONLY
Kees Cook3dc33bd2015-08-12 17:55:19 -07002322 help
2323 Legacy user code that does not know how to find the vDSO expects
2324 to be able to issue three syscalls by calling fixed addresses in
2325 kernel space. Since this location is not randomized with ASLR,
2326 it can be used to assist security vulnerability exploitation.
2327
2328 This setting can be changed at boot time via the kernel command
Andy Lutomirskibd49e162019-06-26 21:45:03 -07002329 line parameter vsyscall=[emulate|xonly|none].
Kees Cook3dc33bd2015-08-12 17:55:19 -07002330
2331 On a system with recent enough glibc (2.14 or newer) and no
2332 static binaries, you can say None without a performance penalty
2333 to improve security.
2334
Andy Lutomirskibd49e162019-06-26 21:45:03 -07002335 If unsure, select "Emulate execution only".
Kees Cook3dc33bd2015-08-12 17:55:19 -07002336
Kees Cook3dc33bd2015-08-12 17:55:19 -07002337 config LEGACY_VSYSCALL_EMULATE
Andy Lutomirskibd49e162019-06-26 21:45:03 -07002338 bool "Full emulation"
Kees Cook3dc33bd2015-08-12 17:55:19 -07002339 help
Andy Lutomirskibd49e162019-06-26 21:45:03 -07002340 The kernel traps and emulates calls into the fixed vsyscall
2341 address mapping. This makes the mapping non-executable, but
2342 it still contains readable known contents, which could be
2343 used in certain rare security vulnerability exploits. This
2344 configuration is recommended when using legacy userspace
2345 that still uses vsyscalls along with legacy binary
2346 instrumentation tools that require code to be readable.
2347
2348 An example of this type of legacy userspace is running
2349 Pin on an old binary that still uses vsyscalls.
2350
2351 config LEGACY_VSYSCALL_XONLY
2352 bool "Emulate execution only"
2353 help
2354 The kernel traps and emulates calls into the fixed vsyscall
2355 address mapping and does not allow reads. This
2356 configuration is recommended when userspace might use the
2357 legacy vsyscall area but support for legacy binary
2358 instrumentation of legacy code is not needed. It mitigates
2359 certain uses of the vsyscall area as an ASLR-bypassing
2360 buffer.
Kees Cook3dc33bd2015-08-12 17:55:19 -07002361
2362 config LEGACY_VSYSCALL_NONE
2363 bool "None"
2364 help
2365 There will be no vsyscall mapping at all. This will
2366 eliminate any risk of ASLR bypass due to the vsyscall
2367 fixed address mapping. Attempts to use the vsyscalls
2368 will be reported to dmesg, so that either old or
2369 malicious userspace programs can be identified.
2370
2371endchoice
2372
Tim Bird516cbf32008-08-12 12:52:36 -07002373config CMDLINE_BOOL
2374 bool "Built-in kernel command line"
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002375 help
Tim Bird516cbf32008-08-12 12:52:36 -07002376 Allow for specifying boot arguments to the kernel at
2377 build time. On some systems (e.g. embedded ones), it is
2378 necessary or convenient to provide some or all of the
2379 kernel boot arguments with the kernel itself (that is,
2380 to not rely on the boot loader to provide them.)
2381
2382 To compile command line arguments into the kernel,
2383 set this option to 'Y', then fill in the
Sébastien Hinderer69711ca2015-07-08 00:02:01 +02002384 boot arguments in CONFIG_CMDLINE.
Tim Bird516cbf32008-08-12 12:52:36 -07002385
2386 Systems with fully functional boot loaders (i.e. non-embedded)
2387 should leave this option set to 'N'.
2388
2389config CMDLINE
2390 string "Built-in kernel command string"
2391 depends on CMDLINE_BOOL
2392 default ""
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002393 help
Tim Bird516cbf32008-08-12 12:52:36 -07002394 Enter arguments here that should be compiled into the kernel
2395 image and used at boot time. If the boot loader provides a
2396 command line at boot time, it is appended to this string to
2397 form the full kernel command line, when the system boots.
2398
2399 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
2400 change this behavior.
2401
2402 In most cases, the command line (whether built-in or provided
2403 by the boot loader) should specify the device for the root
2404 file system.
2405
2406config CMDLINE_OVERRIDE
2407 bool "Built-in command line overrides boot loader arguments"
Anders Roxell645e6462020-01-24 12:46:15 +01002408 depends on CMDLINE_BOOL && CMDLINE != ""
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002409 help
Tim Bird516cbf32008-08-12 12:52:36 -07002410 Set this option to 'Y' to have the kernel ignore the boot loader
2411 command line, and use ONLY the built-in command line.
2412
2413 This is used to work around broken boot loaders. This should
2414 be set to 'N' under normal conditions.
2415
Andy Lutomirskia5b9e5a2015-07-30 14:31:34 -07002416config MODIFY_LDT_SYSCALL
2417 bool "Enable the LDT (local descriptor table)" if EXPERT
2418 default y
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002419 help
Andy Lutomirskia5b9e5a2015-07-30 14:31:34 -07002420 Linux can allow user programs to install a per-process x86
2421 Local Descriptor Table (LDT) using the modify_ldt(2) system
2422 call. This is required to run 16-bit or segmented code such as
2423 DOSEMU or some Wine programs. It is also used by some very old
2424 threading libraries.
2425
2426 Enabling this feature adds a small amount of overhead to
2427 context switches and increases the low-level kernel attack
2428 surface. Disabling it removes the modify_ldt(2) system call.
2429
2430 Saying 'N' here may make sense for embedded or server kernels.
2431
Thomas Gleixner3aac3eb2021-10-21 15:55:06 -07002432config STRICT_SIGALTSTACK_SIZE
2433 bool "Enforce strict size checking for sigaltstack"
2434 depends on DYNAMIC_SIGFRAME
2435 help
2436 For historical reasons MINSIGSTKSZ is a constant which became
2437 already too small with AVX512 support. Add a mechanism to
2438 enforce strict checking of the sigaltstack size against the
2439 real size of the FPU frame. This option enables the check
2440 by default. It can also be controlled via the kernel command
2441 line option 'strict_sas_size' independent of this config
2442 switch. Enabling it might break existing applications which
2443 allocate a too small sigaltstack but 'work' because they
2444 never get a signal delivered.
2445
2446 Say 'N' unless you want to really enforce this check.
2447
Seth Jenningsb700e7f2014-12-16 11:58:19 -06002448source "kernel/livepatch/Kconfig"
2449
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002450endmenu
2451
Michal Hocko3072e412017-09-08 16:11:39 -07002452config ARCH_HAS_ADD_PAGES
2453 def_bool y
David Hildenbrand5c11f00b2021-11-05 13:44:39 -07002454 depends on ARCH_ENABLE_MEMORY_HOTPLUG
Michal Hocko3072e412017-09-08 16:11:39 -07002455
Oscar Salvadorf91ef222021-05-04 18:39:51 -07002456config ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
2457 def_bool y
2458
Bjorn Helgaasda85f862008-11-05 13:37:27 -06002459menu "Power management and ACPI options"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002460
2461config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002462 def_bool y
Zhimin Gu44556532018-09-21 14:27:29 +08002463 depends on HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002464
2465source "kernel/power/Kconfig"
2466
2467source "drivers/acpi/Kconfig"
2468
Andi Kleena6b68072008-01-30 13:32:49 +01002469config X86_APM_BOOT
Jan Beulich6fc108a2010-04-21 15:23:44 +01002470 def_bool y
Paul Bolle282e5aa2011-11-17 11:41:31 +01002471 depends on APM
Andi Kleena6b68072008-01-30 13:32:49 +01002472
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002473menuconfig APM
2474 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002475 depends on X86_32 && PM_SLEEP
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002476 help
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002477 APM is a BIOS specification for saving power using several different
2478 techniques. This is mostly useful for battery powered laptops with
2479 APM compliant BIOSes. If you say Y here, the system time will be
2480 reset after a RESUME operation, the /proc/apm device will provide
2481 battery status information, and user-space programs will receive
2482 notification of APM "events" (e.g. battery status change).
2483
2484 If you select "Y" here, you can disable actual use of the APM
2485 BIOS by passing the "apm=off" option to the kernel at boot time.
2486
2487 Note that the APM support is almost completely disabled for
2488 machines with more than one CPU.
2489
2490 In order to use APM, you will need supporting software. For location
Mauro Carvalho Chehab151f4e22019-06-13 07:10:36 -03002491 and more information, read <file:Documentation/power/apm-acpi.rst>
Michael Witten2dc98fd2011-07-08 21:11:16 +00002492 and the Battery Powered Linux mini-HOWTO, available from
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002493 <http://www.tldp.org/docs.html#howto>.
2494
2495 This driver does not spin down disk drives (see the hdparm(8)
2496 manpage ("man 8 hdparm") for that), and it doesn't turn off
2497 VESA-compliant "green" monitors.
2498
2499 This driver does not support the TI 4000M TravelMate and the ACER
2500 486/DX4/75 because they don't have compliant BIOSes. Many "green"
2501 desktop machines also don't have compliant BIOSes, and this driver
2502 may cause those machines to panic during the boot phase.
2503
2504 Generally, if you don't have a battery in your machine, there isn't
2505 much point in using this driver and you should say N. If you get
2506 random kernel OOPSes or reboots that don't seem to be related to
2507 anything, try disabling/enabling this option (or disabling/enabling
2508 APM in your BIOS).
2509
2510 Some other things you should try when experiencing seemingly random,
2511 "weird" problems:
2512
2513 1) make sure that you have enough swap space and that it is
2514 enabled.
2515 2) pass the "no-hlt" option to the kernel
2516 3) switch on floating point emulation in the kernel and pass
2517 the "no387" option to the kernel
2518 4) pass the "floppy=nodma" option to the kernel
2519 5) pass the "mem=4M" option to the kernel (thereby disabling
2520 all but the first 4 MB of RAM)
2521 6) make sure that the CPU is not over clocked.
2522 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
2523 8) disable the cache from your BIOS settings
2524 9) install a fan for the video card or exchange video RAM
2525 10) install a better fan for the CPU
2526 11) exchange RAM chips
2527 12) exchange the motherboard.
2528
2529 To compile this driver as a module, choose M here: the
2530 module will be called apm.
2531
2532if APM
2533
2534config APM_IGNORE_USER_SUSPEND
2535 bool "Ignore USER SUSPEND"
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002536 help
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002537 This option will ignore USER SUSPEND requests. On machines with a
2538 compliant APM BIOS, you want to say N. However, on the NEC Versa M
2539 series notebooks, it is necessary to say Y because of a BIOS bug.
2540
2541config APM_DO_ENABLE
2542 bool "Enable PM at boot time"
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002543 help
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002544 Enable APM features at boot time. From page 36 of the APM BIOS
2545 specification: "When disabled, the APM BIOS does not automatically
2546 power manage devices, enter the Standby State, enter the Suspend
2547 State, or take power saving steps in response to CPU Idle calls."
2548 This driver will make CPU Idle calls when Linux is idle (unless this
2549 feature is turned off -- see "Do CPU IDLE calls", below). This
2550 should always save battery power, but more complicated APM features
2551 will be dependent on your BIOS implementation. You may need to turn
2552 this option off if your computer hangs at boot time when using APM
2553 support, or if it beeps continuously instead of suspending. Turn
2554 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
2555 T400CDT. This is off by default since most machines do fine without
2556 this feature.
2557
2558config APM_CPU_IDLE
Len Browndd8af072013-02-09 21:10:04 -05002559 depends on CPU_IDLE
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002560 bool "Make CPU Idle calls when idle"
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002561 help
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002562 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
2563 On some machines, this can activate improved power savings, such as
2564 a slowed CPU clock rate, when the machine is idle. These idle calls
2565 are made after the idle loop has run for some length of time (e.g.,
2566 333 mS). On some machines, this will cause a hang at boot time or
2567 whenever the CPU becomes idle. (On machines with more than one CPU,
2568 this option does nothing.)
2569
2570config APM_DISPLAY_BLANK
2571 bool "Enable console blanking using APM"
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002572 help
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002573 Enable console blanking using the APM. Some laptops can use this to
2574 turn off the LCD backlight when the screen blanker of the Linux
2575 virtual console blanks the screen. Note that this is only used by
2576 the virtual console screen blanker, and won't turn off the backlight
2577 when using the X Window system. This also doesn't have anything to
2578 do with your VESA-compliant power-saving monitor. Further, this
2579 option doesn't work for all laptops -- it might not turn off your
2580 backlight at all, or it might print a lot of errors to the console,
2581 especially if you are using gpm.
2582
2583config APM_ALLOW_INTS
2584 bool "Allow interrupts during APM BIOS calls"
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002585 help
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002586 Normally we disable external interrupts while we are making calls to
2587 the APM BIOS as a measure to lessen the effects of a badly behaving
2588 BIOS implementation. The BIOS should reenable interrupts if it
2589 needs to. Unfortunately, some BIOSes do not -- especially those in
2590 many of the newer IBM Thinkpads. If you experience hangs when you
2591 suspend, try setting this to Y. Otherwise, say N.
2592
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002593endif # APM
2594
Dave Jonesbb0a56e2011-05-19 18:51:07 -04002595source "drivers/cpufreq/Kconfig"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002596
2597source "drivers/cpuidle/Kconfig"
2598
Andy Henroid27471fd2008-10-09 11:45:22 -07002599source "drivers/idle/Kconfig"
2600
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002601endmenu
2602
2603
2604menu "Bus options (PCI etc.)"
2605
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002606choice
2607 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002608 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002609 default PCI_GOANY
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002610 help
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002611 On PCI systems, the BIOS can be used to detect the PCI devices and
2612 determine their configuration. However, some old PCI motherboards
2613 have BIOS bugs and may crash if this is done. Also, some embedded
2614 PCI-based systems don't have any BIOS at all. Linux can also try to
2615 detect the PCI hardware directly without using the BIOS.
2616
2617 With this option, you can specify how Linux should detect the
2618 PCI devices. If you choose "BIOS", the BIOS will be used,
2619 if you choose "Direct", the BIOS won't be used, and if you
2620 choose "MMConfig", then PCI Express MMCONFIG will be used.
2621 If you choose "Any", the kernel will try MMCONFIG, then the
2622 direct access method and falls back to the BIOS if that doesn't
2623 work. If unsure, go with the default, which is "Any".
2624
2625config PCI_GOBIOS
2626 bool "BIOS"
2627
2628config PCI_GOMMCONFIG
2629 bool "MMConfig"
2630
2631config PCI_GODIRECT
2632 bool "Direct"
2633
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002634config PCI_GOOLPC
Daniel Drake76fb6572010-09-23 17:28:04 +01002635 bool "OLPC XO-1"
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002636 depends on OLPC
2637
Andres Salomon2bdd1b02008-06-05 14:14:41 -07002638config PCI_GOANY
2639 bool "Any"
2640
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002641endchoice
2642
2643config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002644 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002645 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002646
2647# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
2648config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002649 def_bool y
Shaohua Li0aba4962011-05-27 14:59:39 +08002650 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002651
2652config PCI_MMCONFIG
Jan Kiszkab45c9f32018-03-07 08:39:16 +01002653 bool "Support mmconfig PCI config space access" if X86_64
2654 default y
Andy Shevchenko4590d982021-02-11 15:40:02 +02002655 depends on PCI && (ACPI || JAILHOUSE_GUEST)
Jan Kiszkab45c9f32018-03-07 08:39:16 +01002656 depends on X86_64 || (PCI_GOANY || PCI_GOMMCONFIG)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002657
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002658config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07002659 def_bool y
2660 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002661
Alex Nixonb5401a92010-03-18 16:31:34 -04002662config PCI_XEN
2663 def_bool y
2664 depends on PCI && XEN
Alex Nixonb5401a92010-03-18 16:31:34 -04002665
Jan Kiszka8364e1f2018-03-07 08:39:17 +01002666config MMCONF_FAM10H
2667 def_bool y
2668 depends on X86_64 && PCI_MMCONFIG && ACPI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002669
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07002670config PCI_CNB20LE_QUIRK
David Rientjes6a108a12011-01-20 14:44:16 -08002671 bool "Read CNB20LE Host Bridge Windows" if EXPERT
Kees Cook6ea30382012-10-02 11:16:47 -07002672 depends on PCI
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07002673 help
2674 Read the PCI windows out of the CNB20LE host bridge. This allows
2675 PCI hotplug to work on systems with the CNB20LE chipset which do
2676 not have ACPI.
2677
Bjorn Helgaas64a5fed2011-01-06 10:12:30 -07002678 There's no public spec for this chipset, and this functionality
2679 is known to be incomplete.
2680
2681 You should say N unless you know you need this.
2682
William Breathitt Gray3a495512016-05-27 18:08:27 -04002683config ISA_BUS
William Breathitt Gray17a2a122017-12-29 15:14:46 -05002684 bool "ISA bus support on modern systems" if EXPERT
William Breathitt Gray3a495512016-05-27 18:08:27 -04002685 help
William Breathitt Gray17a2a122017-12-29 15:14:46 -05002686 Expose ISA bus device drivers and options available for selection and
2687 configuration. Enable this option if your target machine has an ISA
2688 bus. ISA is an older system, displaced by PCI and newer bus
2689 architectures -- if your target machine is modern, it probably does
2690 not have an ISA bus.
William Breathitt Gray3a495512016-05-27 18:08:27 -04002691
2692 If unsure, say N.
2693
David Rientjes1c00f012011-03-22 16:34:59 -07002694# x86_64 have no ISA slots, but can have ISA-style DMA.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002695config ISA_DMA_API
David Rientjes1c00f012011-03-22 16:34:59 -07002696 bool "ISA-style DMA support" if (X86_64 && EXPERT)
2697 default y
2698 help
2699 Enables ISA-style DMA support for devices requiring such controllers.
2700 If unsure, say Y.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002701
Linus Torvalds51e68d02016-05-21 10:25:19 -07002702if X86_32
2703
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002704config ISA
2705 bool "ISA support"
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002706 help
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002707 Find out whether you have ISA slots on your motherboard. ISA is the
2708 name of a bus system, i.e. the way the CPU talks to the other stuff
2709 inside your box. Other bus systems are PCI, EISA, MicroChannel
2710 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
2711 newer boards don't support it. If you have ISA, say Y, otherwise N.
2712
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002713config SCx200
2714 tristate "NatSemi SCx200 support"
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002715 help
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002716 This provides basic support for National Semiconductor's
2717 (now AMD's) Geode processors. The driver probes for the
2718 PCI-IDs of several on-chip devices, so its a good dependency
2719 for other scx200_* drivers.
2720
2721 If compiled as a module, the driver is named scx200.
2722
2723config SCx200HR_TIMER
2724 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
John Stultz592913e2010-07-13 17:56:20 -07002725 depends on SCx200
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002726 default y
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002727 help
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002728 This driver provides a clocksource built upon the on-chip
2729 27MHz high-resolution timer. Its also a workaround for
2730 NSC Geode SC-1100's buggy TSC, which loses time when the
2731 processor goes idle (as is done by the scheduler). The
2732 other workaround is idle=poll boot option.
2733
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002734config OLPC
2735 bool "One Laptop Per Child support"
Thomas Gleixner54008972011-02-23 09:50:15 +01002736 depends on !X86_PAE
Andres Salomon3c554942009-12-14 18:00:36 -08002737 select GPIOLIB
Thomas Gleixnerdc3119e702011-02-23 10:08:31 +01002738 select OF
Daniel Drake45bb1672011-03-13 15:10:17 +00002739 select OF_PROMTREE
Grant Likelyb4e51852011-12-16 15:50:17 -07002740 select IRQ_DOMAIN
Lubomir Rintel0c3d9312019-05-13 09:56:37 +02002741 select OLPC_EC
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002742 help
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002743 Add support for detecting the unique features of the OLPC
2744 XO hardware.
2745
Daniel Drakea3128582011-06-25 17:34:10 +01002746config OLPC_XO1_PM
2747 bool "OLPC XO-1 Power Management"
Borislav Petkovfa112cf2018-10-05 15:13:07 +02002748 depends on OLPC && MFD_CS5535=y && PM_SLEEP
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002749 help
Daniel Drake97c4cb72011-06-25 17:34:11 +01002750 Add support for poweroff and suspend of the OLPC XO-1 laptop.
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002751
Daniel Drakecfee9592011-06-25 17:34:17 +01002752config OLPC_XO1_RTC
2753 bool "OLPC XO-1 Real Time Clock"
2754 depends on OLPC_XO1_PM && RTC_DRV_CMOS
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002755 help
Daniel Drakecfee9592011-06-25 17:34:17 +01002756 Add support for the XO-1 real time clock, which can be used as a
2757 programmable wakeup source.
2758
Daniel Drake7feda8e92011-06-25 17:34:12 +01002759config OLPC_XO1_SCI
2760 bool "OLPC XO-1 SCI extras"
Arnd Bergmann92e830f2018-04-04 14:44:54 +02002761 depends on OLPC && OLPC_XO1_PM && GPIO_CS5535=y
Randy Dunlaped8e47f2012-12-18 12:22:17 -08002762 depends on INPUT=y
Daniel Draked8d01a62011-07-24 18:33:21 +01002763 select POWER_SUPPLY
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002764 help
Daniel Drake7feda8e92011-06-25 17:34:12 +01002765 Add support for SCI-based features of the OLPC XO-1 laptop:
Daniel Drake7bc74b32011-06-25 17:34:14 +01002766 - EC-driven system wakeups
Daniel Drake7feda8e92011-06-25 17:34:12 +01002767 - Power button
Daniel Drake7bc74b32011-06-25 17:34:14 +01002768 - Ebook switch
Daniel Drake2cf2bae2011-06-25 17:34:15 +01002769 - Lid switch
Daniel Drakee1040ac2011-06-25 17:34:16 +01002770 - AC adapter status updates
2771 - Battery status updates
Daniel Drake7feda8e92011-06-25 17:34:12 +01002772
Daniel Drakea0f30f52011-06-25 17:34:18 +01002773config OLPC_XO15_SCI
2774 bool "OLPC XO-1.5 SCI extras"
Daniel Draked8d01a62011-07-24 18:33:21 +01002775 depends on OLPC && ACPI
2776 select POWER_SUPPLY
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002777 help
Daniel Drakea0f30f52011-06-25 17:34:18 +01002778 Add support for SCI-based features of the OLPC XO-1.5 laptop:
2779 - EC-driven system wakeups
2780 - AC adapter status updates
2781 - Battery status updates
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002782
Ed Wildgoosed4f3e352011-09-20 14:00:12 -07002783config ALIX
2784 bool "PCEngines ALIX System Support (LED setup)"
2785 select GPIOLIB
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002786 help
Ed Wildgoosed4f3e352011-09-20 14:00:12 -07002787 This option enables system support for the PCEngines ALIX.
2788 At present this just sets up LEDs for GPIO control on
2789 ALIX2/3/6 boards. However, other system specific setup should
2790 get added here.
2791
2792 Note: You must still enable the drivers for GPIO and LED support
2793 (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs
2794
2795 Note: You have to set alix.force=1 for boards with Award BIOS.
2796
Philip Prindevilleda4e3302012-03-05 15:05:15 -08002797config NET5501
2798 bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)"
2799 select GPIOLIB
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002800 help
Philip Prindevilleda4e3302012-03-05 15:05:15 -08002801 This option enables system support for the Soekris Engineering net5501.
2802
Philip A. Prindeville31970592012-01-14 01:45:39 -07002803config GEOS
2804 bool "Traverse Technologies GEOS System Support (LEDS, GPIO, etc)"
2805 select GPIOLIB
2806 depends on DMI
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002807 help
Philip A. Prindeville31970592012-01-14 01:45:39 -07002808 This option enables system support for the Traverse Technologies GEOS.
2809
Vivien Didelot7d029122013-01-04 16:18:14 -05002810config TS5500
2811 bool "Technologic Systems TS-5500 platform support"
2812 depends on MELAN
2813 select CHECK_SIGNATURE
2814 select NEW_LEDS
2815 select LEDS_CLASS
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002816 help
Vivien Didelot7d029122013-01-04 16:18:14 -05002817 This option enables system support for the Technologic Systems TS-5500.
2818
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002819endif # X86_32
2820
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +02002821config AMD_NB
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002822 def_bool y
Borislav Petkov0e152cd2010-03-12 15:43:03 +01002823 depends on CPU_SUP_AMD && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002824
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002825endmenu
2826
2827
Christoph Hellwig15724972018-07-31 13:39:30 +02002828menu "Binary Emulations"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002829
2830config IA32_EMULATION
2831 bool "IA32 Emulation"
2832 depends on X86_64
Ingo Molnar39f88912016-11-15 10:22:52 +01002833 select ARCH_WANT_OLD_COMPAT_IPC
Randy Dunlapd1603992013-06-18 12:33:40 -07002834 select BINFMT_ELF
Ingo Molnar39f88912016-11-15 10:22:52 +01002835 select COMPAT_OLD_SIGACTION
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002836 help
H. J. Lu5fd92e62012-02-19 10:40:03 -08002837 Include code to run legacy 32-bit programs under a
2838 64-bit kernel. You should likely turn this on, unless you're
2839 100% sure that you don't have any 32-bit programs left.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002840
2841config IA32_AOUT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002842 tristate "IA32 a.out support"
2843 depends on IA32_EMULATION
Borislav Petkoveac61652019-03-05 15:47:51 +01002844 depends on BROKEN
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002845 help
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002846 Support old a.out binaries in the 32bit emulation.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002847
Masahiro Yamada83a44a42022-03-14 12:48:41 -07002848config X86_X32_ABI
Kees Cook6ea30382012-10-02 11:16:47 -07002849 bool "x32 ABI for 64-bit mode"
Brian Gerst9b540502015-06-22 07:55:21 -04002850 depends on X86_64
Nathan Chancelloraaeed6e2022-03-14 12:48:42 -07002851 # llvm-objcopy does not convert x86_64 .note.gnu.property or
2852 # compressed debug sections to x86_x32 properly:
2853 # https://github.com/ClangBuiltLinux/linux/issues/514
2854 # https://github.com/ClangBuiltLinux/linux/issues/1141
2855 depends on $(success,$(OBJCOPY) --version | head -n1 | grep -qv llvm)
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +09002856 help
H. J. Lu5fd92e62012-02-19 10:40:03 -08002857 Include code to run binaries for the x32 native 32-bit ABI
2858 for 64-bit processors. An x32 process gets access to the
2859 full 64-bit register file and wide data path while leaving
2860 pointers at 32 bits for smaller memory footprint.
2861
Ingo Molnar953fee12016-11-15 10:22:52 +01002862config COMPAT_32
2863 def_bool y
2864 depends on IA32_EMULATION || X86_32
2865 select HAVE_UID16
2866 select OLD_SIGSUSPEND3
2867
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002868config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002869 def_bool y
Masahiro Yamada83a44a42022-03-14 12:48:41 -07002870 depends on IA32_EMULATION || X86_X32_ABI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002871
Jan Beulich3120e252012-09-10 12:41:45 +01002872if COMPAT
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002873config COMPAT_FOR_U64_ALIGNMENT
Jan Beulich3120e252012-09-10 12:41:45 +01002874 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002875
2876config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002877 def_bool y
Jan Beulich3120e252012-09-10 12:41:45 +01002878 depends on SYSVIPC
Jan Beulich3120e252012-09-10 12:41:45 +01002879endif
David Howellsee009e4a02011-03-07 15:06:20 +00002880
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002881endmenu
2882
2883
Keith Packarde5beae12008-11-03 18:21:45 +01002884config HAVE_ATOMIC_IOMAP
2885 def_bool y
2886 depends on X86_32
2887
Avi Kivityedf88412007-12-16 11:02:48 +02002888source "arch/x86/kvm/Kconfig"
Jason A. Donenfeld5e8ebd82020-03-26 17:00:58 +09002889
2890source "arch/x86/Kconfig.assembler"