| # Select 32 or 64 bit |
| config 64BIT |
| bool "64-bit kernel" if ARCH = "x86" |
| default ARCH != "i386" |
| ---help--- |
| Say yes to build a 64-bit kernel - formerly known as x86_64 |
| Say no to build a 32-bit kernel - formerly known as i386 |
| |
| config X86_32 |
| def_bool y |
| depends on !64BIT |
| select CLKSRC_I8253 |
| select HAVE_UID16 |
| |
| config X86_64 |
| def_bool y |
| depends on 64BIT |
| select X86_DEV_DMA_OPS |
| select ARCH_USE_CMPXCHG_LOCKREF |
| |
| ### Arch settings |
| config X86 |
| def_bool y |
| select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS |
| select ARCH_MIGHT_HAVE_PC_PARPORT |
| select HAVE_AOUT if X86_32 |
| select HAVE_UNSTABLE_SCHED_CLOCK |
| select ARCH_SUPPORTS_NUMA_BALANCING |
| select ARCH_SUPPORTS_INT128 if X86_64 |
| select ARCH_WANTS_PROT_NUMA_PROT_NONE |
| select HAVE_IDE |
| select HAVE_OPROFILE |
| select HAVE_PCSPKR_PLATFORM |
| select HAVE_PERF_EVENTS |
| select HAVE_IOREMAP_PROT |
| select HAVE_KPROBES |
| select HAVE_MEMBLOCK |
| select HAVE_MEMBLOCK_NODE_MAP |
| select ARCH_DISCARD_MEMBLOCK |
| select ARCH_WANT_OPTIONAL_GPIOLIB |
| select ARCH_WANT_FRAME_POINTERS |
| select HAVE_DMA_ATTRS |
| select HAVE_DMA_CONTIGUOUS if !SWIOTLB |
| select HAVE_KRETPROBES |
| select HAVE_OPTPROBES |
| select HAVE_KPROBES_ON_FTRACE |
| select HAVE_FTRACE_MCOUNT_RECORD |
| select HAVE_FENTRY if X86_64 |
| select HAVE_C_RECORDMCOUNT |
| select HAVE_DYNAMIC_FTRACE |
| select HAVE_DYNAMIC_FTRACE_WITH_REGS |
| select HAVE_FUNCTION_TRACER |
| select HAVE_FUNCTION_GRAPH_TRACER |
| select HAVE_FUNCTION_GRAPH_FP_TEST |
| select HAVE_FUNCTION_TRACE_MCOUNT_TEST |
| select HAVE_SYSCALL_TRACEPOINTS |
| select SYSCTL_EXCEPTION_TRACE |
| select HAVE_KVM |
| select HAVE_ARCH_KGDB |
| select HAVE_ARCH_TRACEHOOK |
| select HAVE_GENERIC_DMA_COHERENT if X86_32 |
| select HAVE_EFFICIENT_UNALIGNED_ACCESS |
| select USER_STACKTRACE_SUPPORT |
| select HAVE_REGS_AND_STACK_ACCESS_API |
| select HAVE_DMA_API_DEBUG |
| select HAVE_KERNEL_GZIP |
| select HAVE_KERNEL_BZIP2 |
| select HAVE_KERNEL_LZMA |
| select HAVE_KERNEL_XZ |
| select HAVE_KERNEL_LZO |
| select HAVE_KERNEL_LZ4 |
| select HAVE_HW_BREAKPOINT |
| select HAVE_MIXED_BREAKPOINTS_REGS |
| select PERF_EVENTS |
| select HAVE_PERF_EVENTS_NMI |
| select HAVE_PERF_REGS |
| select HAVE_PERF_USER_STACK_DUMP |
| select HAVE_DEBUG_KMEMLEAK |
| select ANON_INODES |
| select HAVE_ALIGNED_STRUCT_PAGE if SLUB |
| select HAVE_CMPXCHG_LOCAL |
| select HAVE_CMPXCHG_DOUBLE |
| select HAVE_ARCH_KMEMCHECK |
| select HAVE_USER_RETURN_NOTIFIER |
| select ARCH_BINFMT_ELF_RANDOMIZE_PIE |
| select HAVE_ARCH_JUMP_LABEL |
| select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE |
| select SPARSE_IRQ |
| select GENERIC_FIND_FIRST_BIT |
| select GENERIC_IRQ_PROBE |
| select GENERIC_PENDING_IRQ if SMP |
| select GENERIC_IRQ_SHOW |
| select GENERIC_CLOCKEVENTS_MIN_ADJUST |
| select IRQ_FORCED_THREADING |
| select HAVE_BPF_JIT if X86_64 |
| select HAVE_ARCH_TRANSPARENT_HUGEPAGE |
| select CLKEVT_I8253 |
| select ARCH_HAVE_NMI_SAFE_CMPXCHG |
| select GENERIC_IOMAP |
| select DCACHE_WORD_ACCESS |
| select GENERIC_SMP_IDLE_THREAD |
| select ARCH_WANT_IPC_PARSE_VERSION if X86_32 |
| select HAVE_ARCH_SECCOMP_FILTER |
| select BUILDTIME_EXTABLE_SORT |
| select GENERIC_CMOS_UPDATE |
| select HAVE_ARCH_SOFT_DIRTY |
| select CLOCKSOURCE_WATCHDOG |
| select GENERIC_CLOCKEVENTS |
| select ARCH_CLOCKSOURCE_DATA if X86_64 |
| select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC) |
| select GENERIC_TIME_VSYSCALL if X86_64 |
| select KTIME_SCALAR if X86_32 |
| select GENERIC_STRNCPY_FROM_USER |
| select GENERIC_STRNLEN_USER |
| select HAVE_CONTEXT_TRACKING if X86_64 |
| select HAVE_IRQ_TIME_ACCOUNTING |
| select VIRT_TO_BUS |
| select MODULES_USE_ELF_REL if X86_32 |
| select MODULES_USE_ELF_RELA if X86_64 |
| select CLONE_BACKWARDS if X86_32 |
| select ARCH_USE_BUILTIN_BSWAP |
| select OLD_SIGSUSPEND3 if X86_32 || IA32_EMULATION |
| select OLD_SIGACTION if X86_32 |
| select COMPAT_OLD_SIGACTION if IA32_EMULATION |
| select RTC_LIB |
| select HAVE_DEBUG_STACKOVERFLOW |
| select HAVE_IRQ_EXIT_ON_IRQ_STACK if X86_64 |
| select HAVE_CC_STACKPROTECTOR |
| |
| config INSTRUCTION_DECODER |
| def_bool y |
| depends on KPROBES || PERF_EVENTS || UPROBES |
| |
| config OUTPUT_FORMAT |
| string |
| default "elf32-i386" if X86_32 |
| default "elf64-x86-64" if X86_64 |
| |
| config ARCH_DEFCONFIG |
| string |
| default "arch/x86/configs/i386_defconfig" if X86_32 |
| default "arch/x86/configs/x86_64_defconfig" if X86_64 |
| |
| config LOCKDEP_SUPPORT |
| def_bool y |
| |
| config STACKTRACE_SUPPORT |
| def_bool y |
| |
| config HAVE_LATENCYTOP_SUPPORT |
| def_bool y |
| |
| config MMU |
| def_bool y |
| |
| config SBUS |
| bool |
| |
| config NEED_DMA_MAP_STATE |
| def_bool y |
| depends on X86_64 || INTEL_IOMMU || DMA_API_DEBUG |
| |
| config NEED_SG_DMA_LENGTH |
| def_bool y |
| |
| config GENERIC_ISA_DMA |
| def_bool y |
| depends on ISA_DMA_API |
| |
| config GENERIC_BUG |
| def_bool y |
| depends on BUG |
| select GENERIC_BUG_RELATIVE_POINTERS if X86_64 |
| |
| config GENERIC_BUG_RELATIVE_POINTERS |
| bool |
| |
| config GENERIC_HWEIGHT |
| def_bool y |
| |
| config ARCH_MAY_HAVE_PC_FDC |
| def_bool y |
| depends on ISA_DMA_API |
| |
| config RWSEM_XCHGADD_ALGORITHM |
| def_bool y |
| |
| config GENERIC_CALIBRATE_DELAY |
| def_bool y |
| |
| config ARCH_HAS_CPU_RELAX |
| def_bool y |
| |
| config ARCH_HAS_CACHE_LINE_SIZE |
| def_bool y |
| |
| config ARCH_HAS_CPU_AUTOPROBE |
| def_bool y |
| |
| config HAVE_SETUP_PER_CPU_AREA |
| def_bool y |
| |
| config NEED_PER_CPU_EMBED_FIRST_CHUNK |
| def_bool y |
| |
| config NEED_PER_CPU_PAGE_FIRST_CHUNK |
| def_bool y |
| |
| config ARCH_HIBERNATION_POSSIBLE |
| def_bool y |
| |
| config ARCH_SUSPEND_POSSIBLE |
| def_bool y |
| |
| config ARCH_WANT_HUGE_PMD_SHARE |
| def_bool y |
| |
| config ARCH_WANT_GENERAL_HUGETLB |
| def_bool y |
| |
| config ZONE_DMA32 |
| bool |
| default X86_64 |
| |
| config AUDIT_ARCH |
| bool |
| default X86_64 |
| |
| config ARCH_SUPPORTS_OPTIMIZED_INLINING |
| def_bool y |
| |
| config ARCH_SUPPORTS_DEBUG_PAGEALLOC |
| def_bool y |
| |
| config HAVE_INTEL_TXT |
| def_bool y |
| depends on INTEL_IOMMU && ACPI |
| |
| config X86_32_SMP |
| def_bool y |
| depends on X86_32 && SMP |
| |
| config X86_64_SMP |
| def_bool y |
| depends on X86_64 && SMP |
| |
| config X86_HT |
| def_bool y |
| depends on SMP |
| |
| config X86_32_LAZY_GS |
| def_bool y |
| depends on X86_32 && !CC_STACKPROTECTOR |
| |
| config ARCH_HWEIGHT_CFLAGS |
| string |
| default "-fcall-saved-ecx -fcall-saved-edx" if X86_32 |
| default "-fcall-saved-rdi -fcall-saved-rsi -fcall-saved-rdx -fcall-saved-rcx -fcall-saved-r8 -fcall-saved-r9 -fcall-saved-r10 -fcall-saved-r11" if X86_64 |
| |
| config ARCH_SUPPORTS_UPROBES |
| def_bool y |
| |
| source "init/Kconfig" |
| source "kernel/Kconfig.freezer" |
| |
| menu "Processor type and features" |
| |
| config ZONE_DMA |
| bool "DMA memory allocation support" if EXPERT |
| default y |
| help |
| DMA memory allocation support allows devices with less than 32-bit |
| addressing to allocate within the first 16MB of address space. |
| Disable if no such devices will be used. |
| |
| If unsure, say Y. |
| |
| config SMP |
| bool "Symmetric multi-processing support" |
| ---help--- |
| This enables support for systems with more than one CPU. If you have |
| a system with only one CPU, like most personal computers, say N. If |
| you have a system with more than one CPU, say Y. |
| |
| If you say N here, the kernel will run on single and multiprocessor |
| machines, but will use only one CPU of a multiprocessor machine. If |
| you say Y here, the kernel will run on many, but not all, |
| singleprocessor machines. On a singleprocessor machine, the kernel |
| will run faster if you say N here. |
| |
| Note that if you say Y here and choose architecture "586" or |
| "Pentium" under "Processor family", the kernel will not work on 486 |
| architectures. Similarly, multiprocessor kernels for the "PPro" |
| architecture may not work on all Pentium based boards. |
| |
| People using multiprocessor machines who say Y here should also say |
| Y to "Enhanced Real Time Clock Support", below. The "Advanced Power |
| Management" code will be disabled if you say Y here. |
| |
| See also <file:Documentation/x86/i386/IO-APIC.txt>, |
| <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at |
| <http://www.tldp.org/docs.html#howto>. |
| |
| If you don't know what to do here, say N. |
| |
| config X86_X2APIC |
| bool "Support x2apic" |
| depends on X86_LOCAL_APIC && X86_64 && IRQ_REMAP |
| ---help--- |
| This enables x2apic support on CPUs that have this feature. |
| |
| This allows 32-bit apic IDs (so it can support very large systems), |
| and accesses the local apic via MSRs not via mmio. |
| |
| If you don't know what to do here, say N. |
| |
| config X86_MPPARSE |
| bool "Enable MPS table" if ACPI || SFI |
| default y |
| depends on X86_LOCAL_APIC |
| ---help--- |
| For old smp systems that do not have proper acpi support. Newer systems |
| (esp with 64bit cpus) with acpi support, MADT and DSDT will override it |
| |
| config X86_BIGSMP |
| bool "Support for big SMP systems with more than 8 CPUs" |
| depends on X86_32 && SMP |
| ---help--- |
| This option is needed for the systems that have more than 8 CPUs |
| |
| config GOLDFISH |
| def_bool y |
| depends on X86_GOLDFISH |
| |
| if X86_32 |
| config X86_EXTENDED_PLATFORM |
| bool "Support for extended (non-PC) x86 platforms" |
| default y |
| ---help--- |
| If you disable this option then the kernel will only support |
| standard PC platforms. (which covers the vast majority of |
| systems out there.) |
| |
| If you enable this option then you'll be able to select support |
| for the following (non-PC) 32 bit x86 platforms: |
| Goldfish (Android emulator) |
| AMD Elan |
| NUMAQ (IBM/Sequent) |
| RDC R-321x SoC |
| SGI 320/540 (Visual Workstation) |
| STA2X11-based (e.g. Northville) |
| Summit/EXA (IBM x440) |
| Unisys ES7000 IA32 series |
| Moorestown MID devices |
| |
| If you have one of these systems, or if you want to build a |
| generic distribution kernel, say Y here - otherwise say N. |
| endif |
| |
| if X86_64 |
| config X86_EXTENDED_PLATFORM |
| bool "Support for extended (non-PC) x86 platforms" |
| default y |
| ---help--- |
| If you disable this option then the kernel will only support |
| standard PC platforms. (which covers the vast majority of |
| systems out there.) |
| |
| If you enable this option then you'll be able to select support |
| for the following (non-PC) 64 bit x86 platforms: |
| Numascale NumaChip |
| ScaleMP vSMP |
| SGI Ultraviolet |
| |
| If you have one of these systems, or if you want to build a |
| generic distribution kernel, say Y here - otherwise say N. |
| endif |
| # This is an alphabetically sorted list of 64 bit extended platforms |
| # Please maintain the alphabetic order if and when there are additions |
| config X86_NUMACHIP |
| bool "Numascale NumaChip" |
| depends on X86_64 |
| depends on X86_EXTENDED_PLATFORM |
| depends on NUMA |
| depends on SMP |
| depends on X86_X2APIC |
| depends on PCI_MMCONFIG |
| ---help--- |
| Adds support for Numascale NumaChip large-SMP systems. Needed to |
| enable more than ~168 cores. |
| If you don't have one of these, you should say N here. |
| |
| config X86_VSMP |
| bool "ScaleMP vSMP" |
| select HYPERVISOR_GUEST |
| select PARAVIRT |
| depends on X86_64 && PCI |
| depends on X86_EXTENDED_PLATFORM |
| depends on SMP |
| ---help--- |
| Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is |
| supposed to run on these EM64T-based machines. Only choose this option |
| if you have one of these machines. |
| |
| config X86_UV |
| bool "SGI Ultraviolet" |
| depends on X86_64 |
| depends on X86_EXTENDED_PLATFORM |
| depends on NUMA |
| depends on X86_X2APIC |
| ---help--- |
| This option is needed in order to support SGI Ultraviolet systems. |
| If you don't have one of these, you should say N here. |
| |
| # Following is an alphabetically sorted list of 32 bit extended platforms |
| # Please maintain the alphabetic order if and when there are additions |
| |
| config X86_GOLDFISH |
| bool "Goldfish (Virtual Platform)" |
| depends on X86_32 |
| depends on X86_EXTENDED_PLATFORM |
| ---help--- |
| Enable support for the Goldfish virtual platform used primarily |
| for Android development. Unless you are building for the Android |
| Goldfish emulator say N here. |
| |
| config X86_INTEL_CE |
| bool "CE4100 TV platform" |
| depends on PCI |
| depends on PCI_GODIRECT |
| depends on X86_32 |
| depends on X86_EXTENDED_PLATFORM |
| select X86_REBOOTFIXUPS |
| select OF |
| select OF_EARLY_FLATTREE |
| select IRQ_DOMAIN |
| ---help--- |
| Select for the Intel CE media processor (CE4100) SOC. |
| This option compiles in support for the CE4100 SOC for settop |
| boxes and media devices. |
| |
| config X86_INTEL_MID |
| bool "Intel MID platform support" |
| depends on X86_32 |
| depends on X86_EXTENDED_PLATFORM |
| depends on PCI |
| depends on PCI_GOANY |
| depends on X86_IO_APIC |
| select SFI |
| select I2C |
| select DW_APB_TIMER |
| select APB_TIMER |
| select INTEL_SCU_IPC |
| select MFD_INTEL_MSIC |
| ---help--- |
| Select to build a kernel capable of supporting Intel MID (Mobile |
| Internet Device) platform systems which do not have the PCI legacy |
| interfaces. If you are building for a PC class system say N here. |
| |
| Intel MID platforms are based on an Intel processor and chipset which |
| consume less power than most of the x86 derivatives. |
| |
| config X86_INTEL_LPSS |
| bool "Intel Low Power Subsystem Support" |
| depends on ACPI |
| select COMMON_CLK |
| select PINCTRL |
| ---help--- |
| Select to build support for Intel Low Power Subsystem such as |
| found on Intel Lynxpoint PCH. Selecting this option enables |
| things like clock tree (common clock framework) and pincontrol |
| which are needed by the LPSS peripheral drivers. |
| |
| config X86_RDC321X |
| bool "RDC R-321x SoC" |
| depends on X86_32 |
| depends on X86_EXTENDED_PLATFORM |
| select M486 |
| select X86_REBOOTFIXUPS |
| ---help--- |
| This option is needed for RDC R-321x system-on-chip, also known |
| as R-8610-(G). |
| If you don't have one of these chips, you should say N here. |
| |
| config X86_32_NON_STANDARD |
| bool "Support non-standard 32-bit SMP architectures" |
| depends on X86_32 && SMP |
| depends on X86_EXTENDED_PLATFORM |
| ---help--- |
| This option compiles in the NUMAQ, Summit, bigsmp, ES7000, |
| STA2X11, default subarchitectures. It is intended for a generic |
| binary kernel. If you select them all, kernel will probe it |
| one by one and will fallback to default. |
| |
| # Alphabetically sorted list of Non standard 32 bit platforms |
| |
| config X86_NUMAQ |
| bool "NUMAQ (IBM/Sequent)" |
| depends on X86_32_NON_STANDARD |
| depends on PCI |
| select NUMA |
| select X86_MPPARSE |
| ---help--- |
| This option is used for getting Linux to run on a NUMAQ (IBM/Sequent) |
| NUMA multiquad box. This changes the way that processors are |
| bootstrapped, and uses Clustered Logical APIC addressing mode instead |
| of Flat Logical. You will need a new lynxer.elf file to flash your |
| firmware with - send email to <Martin.Bligh@us.ibm.com>. |
| |
| config X86_SUPPORTS_MEMORY_FAILURE |
| def_bool y |
| # MCE code calls memory_failure(): |
| depends on X86_MCE |
| # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags: |
| depends on !X86_NUMAQ |
| # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH: |
| depends on X86_64 || !SPARSEMEM |
| select ARCH_SUPPORTS_MEMORY_FAILURE |
| |
| config X86_VISWS |
| bool "SGI 320/540 (Visual Workstation)" |
| depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT |
| depends on X86_32_NON_STANDARD |
| ---help--- |
| The SGI Visual Workstation series is an IA32-based workstation |
| based on SGI systems chips with some legacy PC hardware attached. |
| |
| Say Y here to create a kernel to run on the SGI 320 or 540. |
| |
| A kernel compiled for the Visual Workstation will run on general |
| PCs as well. See <file:Documentation/sgi-visws.txt> for details. |
| |
| config STA2X11 |
| bool "STA2X11 Companion Chip Support" |
| depends on X86_32_NON_STANDARD && PCI |
| select X86_DEV_DMA_OPS |
| select X86_DMA_REMAP |
| select SWIOTLB |
| select MFD_STA2X11 |
| select ARCH_REQUIRE_GPIOLIB |
| default n |
| ---help--- |
| This adds support for boards based on the STA2X11 IO-Hub, |
| a.k.a. "ConneXt". The chip is used in place of the standard |
| PC chipset, so all "standard" peripherals are missing. If this |
| option is selected the kernel will still be able to boot on |
| standard PC machines. |
| |
| config X86_SUMMIT |
| bool "Summit/EXA (IBM x440)" |
| depends on X86_32_NON_STANDARD |
| ---help--- |
| This option is needed for IBM systems that use the Summit/EXA chipset. |
| In particular, it is needed for the x440. |
| |
| config X86_ES7000 |
| bool "Unisys ES7000 IA32 series" |
| depends on X86_32_NON_STANDARD && X86_BIGSMP |
| ---help--- |
| Support for Unisys ES7000 systems. Say 'Y' here if this kernel is |
| supposed to run on an IA32-based Unisys ES7000 system. |
| |
| config X86_32_IRIS |
| tristate "Eurobraille/Iris poweroff module" |
| depends on X86_32 |
| ---help--- |
| The Iris machines from EuroBraille do not have APM or ACPI support |
| to shut themselves down properly. A special I/O sequence is |
| needed to do so, which is what this module does at |
| kernel shutdown. |
| |
| This is only for Iris machines from EuroBraille. |
| |
| If unused, say N. |
| |
| config SCHED_OMIT_FRAME_POINTER |
| def_bool y |
| prompt "Single-depth WCHAN output" |
| depends on X86 |
| ---help--- |
| Calculate simpler /proc/<PID>/wchan values. If this option |
| is disabled then wchan values will recurse back to the |
| caller function. This provides more accurate wchan values, |
| at the expense of slightly more scheduling overhead. |
| |
| If in doubt, say "Y". |
| |
| menuconfig HYPERVISOR_GUEST |
| bool "Linux guest support" |
| ---help--- |
| Say Y here to enable options for running Linux under various hyper- |
| visors. This option enables basic hypervisor detection and platform |
| setup. |
| |
| If you say N, all options in this submenu will be skipped and |
| disabled, and Linux guest support won't be built in. |
| |
| if HYPERVISOR_GUEST |
| |
| config PARAVIRT |
| bool "Enable paravirtualization code" |
| ---help--- |
| This changes the kernel so it can modify itself when it is run |
| under a hypervisor, potentially improving performance significantly |
| over full virtualization. However, when run without a hypervisor |
| the kernel is theoretically slower and slightly larger. |
| |
| config PARAVIRT_DEBUG |
| bool "paravirt-ops debugging" |
| depends on PARAVIRT && DEBUG_KERNEL |
| ---help--- |
| Enable to debug paravirt_ops internals. Specifically, BUG if |
| a paravirt_op is missing when it is called. |
| |
| config PARAVIRT_SPINLOCKS |
| bool "Paravirtualization layer for spinlocks" |
| depends on PARAVIRT && SMP |
| select UNINLINE_SPIN_UNLOCK |
| ---help--- |
| Paravirtualized spinlocks allow a pvops backend to replace the |
| spinlock implementation with something virtualization-friendly |
| (for example, block the virtual CPU rather than spinning). |
| |
| It has a minimal impact on native kernels and gives a nice performance |
| benefit on paravirtualized KVM / Xen kernels. |
| |
| If you are unsure how to answer this question, answer Y. |
| |
| source "arch/x86/xen/Kconfig" |
| |
| config KVM_GUEST |
| bool "KVM Guest support (including kvmclock)" |
| depends on PARAVIRT |
| select PARAVIRT_CLOCK |
| default y |
| ---help--- |
| This option enables various optimizations for running under the KVM |
| hypervisor. It includes a paravirtualized clock, so that instead |
| of relying on a PIT (or probably other) emulation by the |
| underlying device model, the host provides the guest with |
| timing infrastructure such as time of day, and system time |
| |
| config KVM_DEBUG_FS |
| bool "Enable debug information for KVM Guests in debugfs" |
| depends on KVM_GUEST && DEBUG_FS |
| default n |
| ---help--- |
| This option enables collection of various statistics for KVM guest. |
| Statistics are displayed in debugfs filesystem. Enabling this option |
| may incur significant overhead. |
| |
| source "arch/x86/lguest/Kconfig" |
| |
| config PARAVIRT_TIME_ACCOUNTING |
| bool "Paravirtual steal time accounting" |
| depends on PARAVIRT |
| default n |
| ---help--- |
| Select this option to enable fine granularity task steal time |
| accounting. Time spent executing other tasks in parallel with |
| the current vCPU is discounted from the vCPU power. To account for |
| that, there can be a small performance impact. |
| |
| If in doubt, say N here. |
| |
| config PARAVIRT_CLOCK |
| bool |
| |
| endif #HYPERVISOR_GUEST |
| |
| config NO_BOOTMEM |
| def_bool y |
| |
| config MEMTEST |
| bool "Memtest" |
| ---help--- |
| This option adds a kernel parameter 'memtest', which allows memtest |
| to be set. |
| memtest=0, mean disabled; -- default |
| memtest=1, mean do 1 test pattern; |
| ... |
| memtest=4, mean do 4 test patterns. |
| If you are unsure how to answer this question, answer N. |
| |
| config X86_SUMMIT_NUMA |
| def_bool y |
| depends on X86_32 && NUMA && X86_32_NON_STANDARD |
| |
| config X86_CYCLONE_TIMER |
| def_bool y |
| depends on X86_SUMMIT |
| |
| source "arch/x86/Kconfig.cpu" |
| |
| config HPET_TIMER |
| def_bool X86_64 |
| prompt "HPET Timer Support" if X86_32 |
| ---help--- |
| Use the IA-PC HPET (High Precision Event Timer) to manage |
| time in preference to the PIT and RTC, if a HPET is |
| present. |
| HPET is the next generation timer replacing legacy 8254s. |
| The HPET provides a stable time base on SMP |
| systems, unlike the TSC, but it is more expensive to access, |
| as it is off-chip. You can find the HPET spec at |
| <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>. |
| |
| You can safely choose Y here. However, HPET will only be |
| activated if the platform and the BIOS support this feature. |
| Otherwise the 8254 will be used for timing services. |
| |
| Choose N to continue using the legacy 8254 timer. |
| |
| config HPET_EMULATE_RTC |
| def_bool y |
| depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y) |
| |
| config APB_TIMER |
| def_bool y if X86_INTEL_MID |
| prompt "Intel MID APB Timer Support" if X86_INTEL_MID |
| select DW_APB_TIMER |
| depends on X86_INTEL_MID && SFI |
| help |
| APB timer is the replacement for 8254, HPET on X86 MID platforms. |
| The APBT provides a stable time base on SMP |
| systems, unlike the TSC, but it is more expensive to access, |
| as it is off-chip. APB timers are always running regardless of CPU |
| C states, they are used as per CPU clockevent device when possible. |
| |
| # Mark as expert because too many people got it wrong. |
| # The code disables itself when not needed. |
| config DMI |
| default y |
| select DMI_SCAN_MACHINE_NON_EFI_FALLBACK |
| bool "Enable DMI scanning" if EXPERT |
| ---help--- |
| Enabled scanning of DMI to identify machine quirks. Say Y |
| here unless you have verified that your setup is not |
| affected by entries in the DMI blacklist. Required by PNP |
| BIOS code. |
| |
| config GART_IOMMU |
| bool "Old AMD GART IOMMU support" |
| select SWIOTLB |
| depends on X86_64 && PCI && AMD_NB |
| ---help--- |
| Provides a driver for older AMD Athlon64/Opteron/Turion/Sempron |
| GART based hardware IOMMUs. |
| |
| The GART supports full DMA access for devices with 32-bit access |
| limitations, on systems with more than 3 GB. This is usually needed |
| for USB, sound, many IDE/SATA chipsets and some other devices. |
| |
| Newer systems typically have a modern AMD IOMMU, supported via |
| the CONFIG_AMD_IOMMU=y config option. |
| |
| In normal configurations this driver is only active when needed: |
| there's more than 3 GB of memory and the system contains a |
| 32-bit limited device. |
| |
| If unsure, say Y. |
| |
| config CALGARY_IOMMU |
| bool "IBM Calgary IOMMU support" |
| select SWIOTLB |
| depends on X86_64 && PCI |
| ---help--- |
| Support for hardware IOMMUs in IBM's xSeries x366 and x460 |
| systems. Needed to run systems with more than 3GB of memory |
| properly with 32-bit PCI devices that do not support DAC |
| (Double Address Cycle). Calgary also supports bus level |
| isolation, where all DMAs pass through the IOMMU. This |
| prevents them from going anywhere except their intended |
| destination. This catches hard-to-find kernel bugs and |
| mis-behaving drivers and devices that do not use the DMA-API |
| properly to set up their DMA buffers. The IOMMU can be |
| turned off at boot time with the iommu=off parameter. |
| Normally the kernel will make the right choice by itself. |
| If unsure, say Y. |
| |
| config CALGARY_IOMMU_ENABLED_BY_DEFAULT |
| def_bool y |
| prompt "Should Calgary be enabled by default?" |
| depends on CALGARY_IOMMU |
| ---help--- |
| Should Calgary be enabled by default? if you choose 'y', Calgary |
| will be used (if it exists). If you choose 'n', Calgary will not be |
| used even if it exists. If you choose 'n' and would like to use |
| Calgary anyway, pass 'iommu=calgary' on the kernel command line. |
| If unsure, say Y. |
| |
| # need this always selected by IOMMU for the VIA workaround |
| config SWIOTLB |
| def_bool y if X86_64 |
| ---help--- |
| Support for software bounce buffers used on x86-64 systems |
| which don't have a hardware IOMMU. Using this PCI devices |
| which can only access 32-bits of memory can be used on systems |
| with more than 3 GB of memory. |
| If unsure, say Y. |
| |
| config IOMMU_HELPER |
| def_bool y |
| depends on CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU |
| |
| config MAXSMP |
| bool "Enable Maximum number of SMP Processors and NUMA Nodes" |
| depends on X86_64 && SMP && DEBUG_KERNEL |
| select CPUMASK_OFFSTACK |
| ---help--- |
| Enable maximum number of CPUS and NUMA Nodes for this architecture. |
| If unsure, say N. |
| |
| config NR_CPUS |
| int "Maximum number of CPUs" if SMP && !MAXSMP |
| range 2 8 if SMP && X86_32 && !X86_BIGSMP |
| range 2 512 if SMP && !MAXSMP && !CPUMASK_OFFSTACK |
| range 2 8192 if SMP && !MAXSMP && CPUMASK_OFFSTACK && X86_64 |
| default "1" if !SMP |
| default "8192" if MAXSMP |
| default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000) |
| default "8" if SMP |
| ---help--- |
| This allows you to specify the maximum number of CPUs which this |
| kernel will support. If CPUMASK_OFFSTACK is enabled, the maximum |
| supported value is 4096, otherwise the maximum value is 512. The |
| minimum value which makes sense is 2. |
| |
| This is purely to save memory - each supported CPU adds |
| approximately eight kilobytes to the kernel image. |
| |
| config SCHED_SMT |
| bool "SMT (Hyperthreading) scheduler support" |
| depends on X86_HT |
| ---help--- |
| SMT scheduler support improves the CPU scheduler's decision making |
| when dealing with Intel Pentium 4 chips with HyperThreading at a |
| cost of slightly increased overhead in some places. If unsure say |
| N here. |
| |
| config SCHED_MC |
| def_bool y |
| prompt "Multi-core scheduler support" |
| depends on X86_HT |
| ---help--- |
| Multi-core scheduler support improves the CPU scheduler's decision |
| making when dealing with multi-core CPU chips at a cost of slightly |
| increased overhead in some places. If unsure say N here. |
| |
| source "kernel/Kconfig.preempt" |
| |
| config X86_UP_APIC |
| bool "Local APIC support on uniprocessors" |
| depends on X86_32 && !SMP && !X86_32_NON_STANDARD && !PCI_MSI |
| ---help--- |
| A local APIC (Advanced Programmable Interrupt Controller) is an |
| integrated interrupt controller in the CPU. If you have a single-CPU |
| system which has a processor with a local APIC, you can say Y here to |
| enable and use it. If you say Y here even though your machine doesn't |
| have a local APIC, then the kernel will still run with no slowdown at |
| all. The local APIC supports CPU-generated self-interrupts (timer, |
| performance counters), and the NMI watchdog which detects hard |
| lockups. |
| |
| config X86_UP_IOAPIC |
| bool "IO-APIC support on uniprocessors" |
| depends on X86_UP_APIC |
| ---help--- |
| An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an |
| SMP-capable replacement for PC-style interrupt controllers. Most |
| SMP systems and many recent uniprocessor systems have one. |
| |
| If you have a single-CPU system with an IO-APIC, you can say Y here |
| to use it. If you say Y here even though your machine doesn't have |
| an IO-APIC, then the kernel will still run with no slowdown at all. |
| |
| config X86_LOCAL_APIC |
| def_bool y |
| depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC || PCI_MSI |
| |
| config X86_IO_APIC |
| def_bool y |
| depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_IOAPIC || PCI_MSI |
| |
| config X86_VISWS_APIC |
| def_bool y |
| depends on X86_32 && X86_VISWS |
| |
| config X86_REROUTE_FOR_BROKEN_BOOT_IRQS |
| bool "Reroute for broken boot IRQs" |
| depends on X86_IO_APIC |
| ---help--- |
| This option enables a workaround that fixes a source of |
| spurious interrupts. This is recommended when threaded |
| interrupt handling is used on systems where the generation of |
| superfluous "boot interrupts" cannot be disabled. |
| |
| Some chipsets generate a legacy INTx "boot IRQ" when the IRQ |
| entry in the chipset's IO-APIC is masked (as, e.g. the RT |
| kernel does during interrupt handling). On chipsets where this |
| boot IRQ generation cannot be disabled, this workaround keeps |
| the original IRQ line masked so that only the equivalent "boot |
| IRQ" is delivered to the CPUs. The workaround also tells the |
| kernel to set up the IRQ handler on the boot IRQ line. In this |
| way only one interrupt is delivered to the kernel. Otherwise |
| the spurious second interrupt may cause the kernel to bring |
| down (vital) interrupt lines. |
| |
| Only affects "broken" chipsets. Interrupt sharing may be |
| increased on these systems. |
| |
| config X86_MCE |
| bool "Machine Check / overheating reporting" |
| default y |
| ---help--- |
| Machine Check support allows the processor to notify the |
| kernel if it detects a problem (e.g. overheating, data corruption). |
| The action the kernel takes depends on the severity of the problem, |
| ranging from warning messages to halting the machine. |
| |
| config X86_MCE_INTEL |
| def_bool y |
| prompt "Intel MCE features" |
| depends on X86_MCE && X86_LOCAL_APIC |
| ---help--- |
| Additional support for intel specific MCE features such as |
| the thermal monitor. |
| |
| config X86_MCE_AMD |
| def_bool y |
| prompt "AMD MCE features" |
| depends on X86_MCE && X86_LOCAL_APIC |
| ---help--- |
| Additional support for AMD specific MCE features such as |
| the DRAM Error Threshold. |
| |
| config X86_ANCIENT_MCE |
| bool "Support for old Pentium 5 / WinChip machine checks" |
| depends on X86_32 && X86_MCE |
| ---help--- |
| Include support for machine check handling on old Pentium 5 or WinChip |
| systems. These typically need to be enabled explicitly on the command |
| line. |
| |
| config X86_MCE_THRESHOLD |
| depends on X86_MCE_AMD || X86_MCE_INTEL |
| def_bool y |
| |
| config X86_MCE_INJECT |
| depends on X86_MCE |
| tristate "Machine check injector support" |
| ---help--- |
| Provide support for injecting machine checks for testing purposes. |
| If you don't know what a machine check is and you don't do kernel |
| QA it is safe to say n. |
| |
| config X86_THERMAL_VECTOR |
| def_bool y |
| depends on X86_MCE_INTEL |
| |
| config VM86 |
| bool "Enable VM86 support" if EXPERT |
| default y |
| depends on X86_32 |
| ---help--- |
| This option is required by programs like DOSEMU to run 16-bit legacy |
| code on X86 processors. It also may be needed by software like |
| XFree86 to initialize some video cards via BIOS. Disabling this |
| option saves about 6k. |
| |
| config TOSHIBA |
| tristate "Toshiba Laptop support" |
| depends on X86_32 |
| ---help--- |
| This adds a driver to safely access the System Management Mode of |
| the CPU on Toshiba portables with a genuine Toshiba BIOS. It does |
| not work on models with a Phoenix BIOS. The System Management Mode |
| is used to set the BIOS and power saving options on Toshiba portables. |
| |
| For information on utilities to make use of this driver see the |
| Toshiba Linux utilities web site at: |
| <http://www.buzzard.org.uk/toshiba/>. |
| |
| Say Y if you intend to run this kernel on a Toshiba portable. |
| Say N otherwise. |
| |
| config I8K |
| tristate "Dell laptop support" |
| select HWMON |
| ---help--- |
| This adds a driver to safely access the System Management Mode |
| of the CPU on the Dell Inspiron 8000. The System Management Mode |
| is used to read cpu temperature and cooling fan status and to |
| control the fans on the I8K portables. |
| |
| This driver has been tested only on the Inspiron 8000 but it may |
| also work with other Dell laptops. You can force loading on other |
| models by passing the parameter `force=1' to the module. Use at |
| your own risk. |
| |
| For information on utilities to make use of this driver see the |
| I8K Linux utilities web site at: |
| <http://people.debian.org/~dz/i8k/> |
| |
| Say Y if you intend to run this kernel on a Dell Inspiron 8000. |
| Say N otherwise. |
| |
| config X86_REBOOTFIXUPS |
| bool "Enable X86 board specific fixups for reboot" |
| depends on X86_32 |
| ---help--- |
| This enables chipset and/or board specific fixups to be done |
| in order to get reboot to work correctly. This is only needed on |
| some combinations of hardware and BIOS. The symptom, for which |
| this config is intended, is when reboot ends with a stalled/hung |
| system. |
| |
| Currently, the only fixup is for the Geode machines using |
| CS5530A and CS5536 chipsets and the RDC R-321x SoC. |
| |
| Say Y if you want to enable the fixup. Currently, it's safe to |
| enable this option even if you don't need it. |
| Say N otherwise. |
| |
| config MICROCODE |
| tristate "CPU microcode loading support" |
| depends on CPU_SUP_AMD || CPU_SUP_INTEL |
| select FW_LOADER |
| ---help--- |
| |
| If you say Y here, you will be able to update the microcode on |
| certain Intel and AMD processors. The Intel support is for the |
| IA32 family, e.g. Pentium Pro, Pentium II, Pentium III, Pentium 4, |
| Xeon etc. The AMD support is for families 0x10 and later. You will |
| obviously need the actual microcode binary data itself which is not |
| shipped with the Linux kernel. |
| |
| This option selects the general module only, you need to select |
| at least one vendor specific module as well. |
| |
| To compile this driver as a module, choose M here: the module |
| will be called microcode. |
| |
| config MICROCODE_INTEL |
| bool "Intel microcode loading support" |
| depends on MICROCODE |
| default MICROCODE |
| select FW_LOADER |
| ---help--- |
| This options enables microcode patch loading support for Intel |
| processors. |
| |
| For latest news and information on obtaining all the required |
| Intel ingredients for this driver, check: |
| <http://www.urbanmyth.org/microcode/>. |
| |
| config MICROCODE_AMD |
| bool "AMD microcode loading support" |
| depends on MICROCODE |
| select FW_LOADER |
| ---help--- |
| If you select this option, microcode patch loading support for AMD |
| processors will be enabled. |
| |
| config MICROCODE_OLD_INTERFACE |
| def_bool y |
| depends on MICROCODE |
| |
| config MICROCODE_INTEL_EARLY |
| def_bool n |
| |
| config MICROCODE_AMD_EARLY |
| def_bool n |
| |
| config MICROCODE_EARLY |
| bool "Early load microcode" |
| depends on MICROCODE=y && BLK_DEV_INITRD |
| select MICROCODE_INTEL_EARLY if MICROCODE_INTEL |
| select MICROCODE_AMD_EARLY if MICROCODE_AMD |
| default y |
| help |
| This option provides functionality to read additional microcode data |
| at the beginning of initrd image. The data tells kernel to load |
| microcode to CPU's as early as possible. No functional change if no |
| microcode data is glued to the initrd, therefore it's safe to say Y. |
| |
| config X86_MSR |
| tristate "/dev/cpu/*/msr - Model-specific register support" |
| ---help--- |
| This device gives privileged processes access to the x86 |
| Model-Specific Registers (MSRs). It is a character device with |
| major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr. |
| MSR accesses are directed to a specific CPU on multi-processor |
| systems. |
| |
| config X86_CPUID |
| tristate "/dev/cpu/*/cpuid - CPU information support" |
| ---help--- |
| This device gives processes access to the x86 CPUID instruction to |
| be executed on a specific processor. It is a character device |
| with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to |
| /dev/cpu/31/cpuid. |
| |
| choice |
| prompt "High Memory Support" |
| default HIGHMEM64G if X86_NUMAQ |
| default HIGHMEM4G |
| depends on X86_32 |
| |
| config NOHIGHMEM |
| bool "off" |
| depends on !X86_NUMAQ |
| ---help--- |
| Linux can use up to 64 Gigabytes of physical memory on x86 systems. |
| However, the address space of 32-bit x86 processors is only 4 |
| Gigabytes large. That means that, if you have a large amount of |
| physical memory, not all of it can be "permanently mapped" by the |
| kernel. The physical memory that's not permanently mapped is called |
| "high memory". |
| |
| If you are compiling a kernel which will never run on a machine with |
| more than 1 Gigabyte total physical RAM, answer "off" here (default |
| choice and suitable for most users). This will result in a "3GB/1GB" |
| split: 3GB are mapped so that each process sees a 3GB virtual memory |
| space and the remaining part of the 4GB virtual memory space is used |
| by the kernel to permanently map as much physical memory as |
| possible. |
| |
| If the machine has between 1 and 4 Gigabytes physical RAM, then |
| answer "4GB" here. |
| |
| If more than 4 Gigabytes is used then answer "64GB" here. This |
| selection turns Intel PAE (Physical Address Extension) mode on. |
| PAE implements 3-level paging on IA32 processors. PAE is fully |
| supported by Linux, PAE mode is implemented on all recent Intel |
| processors (Pentium Pro and better). NOTE: If you say "64GB" here, |
| then the kernel will not boot on CPUs that don't support PAE! |
| |
| The actual amount of total physical memory will either be |
| auto detected or can be forced by using a kernel command line option |
| such as "mem=256M". (Try "man bootparam" or see the documentation of |
| your boot loader (lilo or loadlin) about how to pass options to the |
| kernel at boot time.) |
| |
| If unsure, say "off". |
| |
| config HIGHMEM4G |
| bool "4GB" |
| depends on !X86_NUMAQ |
| ---help--- |
| Select this if you have a 32-bit processor and between 1 and 4 |
| gigabytes of physical RAM. |
| |
| config HIGHMEM64G |
| bool "64GB" |
| depends on !M486 |
| select X86_PAE |
| ---help--- |
| Select this if you have a 32-bit processor and more than 4 |
| gigabytes of physical RAM. |
| |
| endchoice |
| |
| choice |
| prompt "Memory split" if EXPERT |
| default VMSPLIT_3G |
| depends on X86_32 |
| ---help--- |
| Select the desired split between kernel and user memory. |
| |
| If the address range available to the kernel is less than the |
| physical memory installed, the remaining memory will be available |
| as "high memory". Accessing high memory is a little more costly |
| than low memory, as it needs to be mapped into the kernel first. |
| Note that increasing the kernel address space limits the range |
| available to user programs, making the address space there |
| tighter. Selecting anything other than the default 3G/1G split |
| will also likely make your kernel incompatible with binary-only |
| kernel modules. |
| |
| If you are not absolutely sure what you are doing, leave this |
| option alone! |
| |
| config VMSPLIT_3G |
| bool "3G/1G user/kernel split" |
| config VMSPLIT_3G_OPT |
| depends on !X86_PAE |
| bool "3G/1G user/kernel split (for full 1G low memory)" |
| config VMSPLIT_2G |
| bool "2G/2G user/kernel split" |
| config VMSPLIT_2G_OPT |
| depends on !X86_PAE |
| bool "2G/2G user/kernel split (for full 2G low memory)" |
| config VMSPLIT_1G |
| bool "1G/3G user/kernel split" |
| endchoice |
| |
| config PAGE_OFFSET |
| hex |
| default 0xB0000000 if VMSPLIT_3G_OPT |
| default 0x80000000 if VMSPLIT_2G |
| default 0x78000000 if VMSPLIT_2G_OPT |
| default 0x40000000 if VMSPLIT_1G |
| default 0xC0000000 |
| depends on X86_32 |
| |
| config HIGHMEM |
| def_bool y |
| depends on X86_32 && (HIGHMEM64G || HIGHMEM4G) |
| |
| config X86_PAE |
| bool "PAE (Physical Address Extension) Support" |
| depends on X86_32 && !HIGHMEM4G |
| ---help--- |
| PAE is required for NX support, and furthermore enables |
| larger swapspace support for non-overcommit purposes. It |
| has the cost of more pagetable lookup overhead, and also |
| consumes more pagetable space per process. |
| |
| config ARCH_PHYS_ADDR_T_64BIT |
| def_bool y |
| depends on X86_64 || X86_PAE |
| |
| config ARCH_DMA_ADDR_T_64BIT |
| def_bool y |
| depends on X86_64 || HIGHMEM64G |
| |
| config DIRECT_GBPAGES |
| bool "Enable 1GB pages for kernel pagetables" if EXPERT |
| default y |
| depends on X86_64 |
| ---help--- |
| Allow the kernel linear mapping to use 1GB pages on CPUs that |
| support it. This can improve the kernel's performance a tiny bit by |
| reducing TLB pressure. If in doubt, say "Y". |
| |
| # Common NUMA Features |
| config NUMA |
| bool "Numa Memory Allocation and Scheduler Support" |
| depends on SMP |
| depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI)) |
| default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP) |
| ---help--- |
| Enable NUMA (Non Uniform Memory Access) support. |
| |
| The kernel will try to allocate memory used by a CPU on the |
| local memory controller of the CPU and add some more |
| NUMA awareness to the kernel. |
| |
| For 64-bit this is recommended if the system is Intel Core i7 |
| (or later), AMD Opteron, or EM64T NUMA. |
| |
| For 32-bit this is only needed on (rare) 32-bit-only platforms |
| that support NUMA topologies, such as NUMAQ / Summit, or if you |
| boot a 32-bit kernel on a 64-bit NUMA platform. |
| |
| Otherwise, you should say N. |
| |
| comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI" |
| depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI) |
| |
| config AMD_NUMA |
| def_bool y |
| prompt "Old style AMD Opteron NUMA detection" |
| depends on X86_64 && NUMA && PCI |
| ---help--- |
| Enable AMD NUMA node topology detection. You should say Y here if |
| you have a multi processor AMD system. This uses an old method to |
| read the NUMA configuration directly from the builtin Northbridge |
| of Opteron. It is recommended to use X86_64_ACPI_NUMA instead, |
| which also takes priority if both are compiled in. |
| |
| config X86_64_ACPI_NUMA |
| def_bool y |
| prompt "ACPI NUMA detection" |
| depends on X86_64 && NUMA && ACPI && PCI |
| select ACPI_NUMA |
| ---help--- |
| Enable ACPI SRAT based node topology detection. |
| |
| # Some NUMA nodes have memory ranges that span |
| # other nodes. Even though a pfn is valid and |
| # between a node's start and end pfns, it may not |
| # reside on that node. See memmap_init_zone() |
| # for details. |
| config NODES_SPAN_OTHER_NODES |
| def_bool y |
| depends on X86_64_ACPI_NUMA |
| |
| config NUMA_EMU |
| bool "NUMA emulation" |
| depends on NUMA |
| ---help--- |
| Enable NUMA emulation. A flat machine will be split |
| into virtual nodes when booted with "numa=fake=N", where N is the |
| number of nodes. This is only useful for debugging. |
| |
| config NODES_SHIFT |
| int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP |
| range 1 10 |
| default "10" if MAXSMP |
| default "6" if X86_64 |
| default "4" if X86_NUMAQ |
| default "3" |
| depends on NEED_MULTIPLE_NODES |
| ---help--- |
| Specify the maximum number of NUMA Nodes available on the target |
| system. Increases memory reserved to accommodate various tables. |
| |
| config ARCH_HAVE_MEMORY_PRESENT |
| def_bool y |
| depends on X86_32 && DISCONTIGMEM |
| |
| config NEED_NODE_MEMMAP_SIZE |
| def_bool y |
| depends on X86_32 && (DISCONTIGMEM || SPARSEMEM) |
| |
| config ARCH_FLATMEM_ENABLE |
| def_bool y |
| depends on X86_32 && !NUMA |
| |
| config ARCH_DISCONTIGMEM_ENABLE |
| def_bool y |
| depends on NUMA && X86_32 |
| |
| config ARCH_DISCONTIGMEM_DEFAULT |
| def_bool y |
| depends on NUMA && X86_32 |
| |
| config ARCH_SPARSEMEM_ENABLE |
| def_bool y |
| depends on X86_64 || NUMA || X86_32 || X86_32_NON_STANDARD |
| select SPARSEMEM_STATIC if X86_32 |
| select SPARSEMEM_VMEMMAP_ENABLE if X86_64 |
| |
| config ARCH_SPARSEMEM_DEFAULT |
| def_bool y |
| depends on X86_64 |
| |
| config ARCH_SELECT_MEMORY_MODEL |
| def_bool y |
| depends on ARCH_SPARSEMEM_ENABLE |
| |
| config ARCH_MEMORY_PROBE |
| bool "Enable sysfs memory/probe interface" |
| depends on X86_64 && MEMORY_HOTPLUG |
| help |
| This option enables a sysfs memory/probe interface for testing. |
| See Documentation/memory-hotplug.txt for more information. |
| If you are unsure how to answer this question, answer N. |
| |
| config ARCH_PROC_KCORE_TEXT |
| def_bool y |
| depends on X86_64 && PROC_KCORE |
| |
| config ILLEGAL_POINTER_VALUE |
| hex |
| default 0 if X86_32 |
| default 0xdead000000000000 if X86_64 |
| |
| source "mm/Kconfig" |
| |
| config HIGHPTE |
| bool "Allocate 3rd-level pagetables from highmem" |
| depends on HIGHMEM |
| ---help--- |
| The VM uses one page table entry for each page of physical memory. |
| For systems with a lot of RAM, this can be wasteful of precious |
| low memory. Setting this option will put user-space page table |
| entries in high memory. |
| |
| config X86_CHECK_BIOS_CORRUPTION |
| bool "Check for low memory corruption" |
| ---help--- |
| Periodically check for memory corruption in low memory, which |
| is suspected to be caused by BIOS. Even when enabled in the |
| configuration, it is disabled at runtime. Enable it by |
| setting "memory_corruption_check=1" on the kernel command |
| line. By default it scans the low 64k of memory every 60 |
| seconds; see the memory_corruption_check_size and |
| memory_corruption_check_period parameters in |
| Documentation/kernel-parameters.txt to adjust this. |
| |
| When enabled with the default parameters, this option has |
| almost no overhead, as it reserves a relatively small amount |
| of memory and scans it infrequently. It both detects corruption |
| and prevents it from affecting the running system. |
| |
| It is, however, intended as a diagnostic tool; if repeatable |
| BIOS-originated corruption always affects the same memory, |
| you can use memmap= to prevent the kernel from using that |
| memory. |
| |
| config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK |
| bool "Set the default setting of memory_corruption_check" |
| depends on X86_CHECK_BIOS_CORRUPTION |
| default y |
| ---help--- |
| Set whether the default state of memory_corruption_check is |
| on or off. |
| |
| config X86_RESERVE_LOW |
| int "Amount of low memory, in kilobytes, to reserve for the BIOS" |
| default 64 |
| range 4 640 |
| ---help--- |
| Specify the amount of low memory to reserve for the BIOS. |
| |
| The first page contains BIOS data structures that the kernel |
| must not use, so that page must always be reserved. |
| |
| By default we reserve the first 64K of physical RAM, as a |
| number of BIOSes are known to corrupt that memory range |
| during events such as suspend/resume or monitor cable |
| insertion, so it must not be used by the kernel. |
| |
| You can set this to 4 if you are absolutely sure that you |
| trust the BIOS to get all its memory reservations and usages |
| right. If you know your BIOS have problems beyond the |
| default 64K area, you can set this to 640 to avoid using the |
| entire low memory range. |
| |
| If you have doubts about the BIOS (e.g. suspend/resume does |
| not work or there's kernel crashes after certain hardware |
| hotplug events) then you might want to enable |
| X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check |
| typical corruption patterns. |
| |
| Leave this to the default value of 64 if you are unsure. |
| |
| config MATH_EMULATION |
| bool |
| prompt "Math emulation" if X86_32 |
| ---help--- |
| Linux can emulate a math coprocessor (used for floating point |
| operations) if you don't have one. 486DX and Pentium processors have |
| a math coprocessor built in, 486SX and 386 do not, unless you added |
| a 487DX or 387, respectively. (The messages during boot time can |
| give you some hints here ["man dmesg"].) Everyone needs either a |
| coprocessor or this emulation. |
| |
| If you don't have a math coprocessor, you need to say Y here; if you |
| say Y here even though you have a coprocessor, the coprocessor will |
| be used nevertheless. (This behavior can be changed with the kernel |
| command line option "no387", which comes handy if your coprocessor |
| is broken. Try "man bootparam" or see the documentation of your boot |
| loader (lilo or loadlin) about how to pass options to the kernel at |
| boot time.) This means that it is a good idea to say Y here if you |
| intend to use this kernel on different machines. |
| |
| More information about the internals of the Linux math coprocessor |
| emulation can be found in <file:arch/x86/math-emu/README>. |
| |
| If you are not sure, say Y; apart from resulting in a 66 KB bigger |
| kernel, it won't hurt. |
| |
| config MTRR |
| def_bool y |
| prompt "MTRR (Memory Type Range Register) support" if EXPERT |
| ---help--- |
| On Intel P6 family processors (Pentium Pro, Pentium II and later) |
| the Memory Type Range Registers (MTRRs) may be used to control |
| processor access to memory ranges. This is most useful if you have |
| a video (VGA) card on a PCI or AGP bus. Enabling write-combining |
| allows bus write transfers to be combined into a larger transfer |
| before bursting over the PCI/AGP bus. This can increase performance |
| of image write operations 2.5 times or more. Saying Y here creates a |
| /proc/mtrr file which may be used to manipulate your processor's |
| MTRRs. Typically the X server should use this. |
| |
| This code has a reasonably generic interface so that similar |
| control registers on other processors can be easily supported |
| as well: |
| |
| The Cyrix 6x86, 6x86MX and M II processors have Address Range |
| Registers (ARRs) which provide a similar functionality to MTRRs. For |
| these, the ARRs are used to emulate the MTRRs. |
| The AMD K6-2 (stepping 8 and above) and K6-3 processors have two |
| MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing |
| write-combining. All of these processors are supported by this code |
| and it makes sense to say Y here if you have one of them. |
| |
| Saying Y here also fixes a problem with buggy SMP BIOSes which only |
| set the MTRRs for the boot CPU and not for the secondary CPUs. This |
| can lead to all sorts of problems, so it's good to say Y here. |
| |
| You can safely say Y even if your machine doesn't have MTRRs, you'll |
| just add about 9 KB to your kernel. |
| |
| See <file:Documentation/x86/mtrr.txt> for more information. |
| |
| config MTRR_SANITIZER |
| def_bool y |
| prompt "MTRR cleanup support" |
| depends on MTRR |
| ---help--- |
| Convert MTRR layout from continuous to discrete, so X drivers can |
| add writeback entries. |
| |
| Can be disabled with disable_mtrr_cleanup on the kernel command line. |
| The largest mtrr entry size for a continuous block can be set with |
| mtrr_chunk_size. |
| |
| If unsure, say Y. |
| |
| config MTRR_SANITIZER_ENABLE_DEFAULT |
| int "MTRR cleanup enable value (0-1)" |
| range 0 1 |
| default "0" |
| depends on MTRR_SANITIZER |
| ---help--- |
| Enable mtrr cleanup default value |
| |
| config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT |
| int "MTRR cleanup spare reg num (0-7)" |
| range 0 7 |
| default "1" |
| depends on MTRR_SANITIZER |
| ---help--- |
| mtrr cleanup spare entries default, it can be changed via |
| mtrr_spare_reg_nr=N on the kernel command line. |
| |
| config X86_PAT |
| def_bool y |
| prompt "x86 PAT support" if EXPERT |
| depends on MTRR |
| ---help--- |
| Use PAT attributes to setup page level cache control. |
| |
| PATs are the modern equivalents of MTRRs and are much more |
| flexible than MTRRs. |
| |
| Say N here if you see bootup problems (boot crash, boot hang, |
| spontaneous reboots) or a non-working video driver. |
| |
| If unsure, say Y. |
| |
| config ARCH_USES_PG_UNCACHED |
| def_bool y |
| depends on X86_PAT |
| |
| config ARCH_RANDOM |
| def_bool y |
| prompt "x86 architectural random number generator" if EXPERT |
| ---help--- |
| Enable the x86 architectural RDRAND instruction |
| (Intel Bull Mountain technology) to generate random numbers. |
| If supported, this is a high bandwidth, cryptographically |
| secure hardware random number generator. |
| |
| config X86_SMAP |
| def_bool y |
| prompt "Supervisor Mode Access Prevention" if EXPERT |
| ---help--- |
| Supervisor Mode Access Prevention (SMAP) is a security |
| feature in newer Intel processors. There is a small |
| performance cost if this enabled and turned on; there is |
| also a small increase in the kernel size if this is enabled. |
| |
| If unsure, say Y. |
| |
| config EFI |
| bool "EFI runtime service support" |
| depends on ACPI |
| select UCS2_STRING |
| ---help--- |
| This enables the kernel to use EFI runtime services that are |
| available (such as the EFI variable services). |
| |
| This option is only useful on systems that have EFI firmware. |
| In addition, you should use the latest ELILO loader available |
| at <http://elilo.sourceforge.net> in order to take advantage |
| of EFI runtime services. However, even with this option, the |
| resultant kernel should continue to boot on existing non-EFI |
| platforms. |
| |
| config EFI_STUB |
| bool "EFI stub support" |
| depends on EFI |
| ---help--- |
| This kernel feature allows a bzImage to be loaded directly |
| by EFI firmware without the use of a bootloader. |
| |
| See Documentation/efi-stub.txt for more information. |
| |
| config SECCOMP |
| def_bool y |
| prompt "Enable seccomp to safely compute untrusted bytecode" |
| ---help--- |
| This kernel feature is useful for number crunching applications |
| that may need to compute untrusted bytecode during their |
| execution. By using pipes or other transports made available to |
| the process as file descriptors supporting the read/write |
| syscalls, it's possible to isolate those applications in |
| their own address space using seccomp. Once seccomp is |
| enabled via prctl(PR_SET_SECCOMP), it cannot be disabled |
| and the task is only allowed to execute a few safe syscalls |
| defined by each seccomp mode. |
| |
| If unsure, say Y. Only embedded should say N here. |
| |
| source kernel/Kconfig.hz |
| |
| config KEXEC |
| bool "kexec system call" |
| ---help--- |
| kexec is a system call that implements the ability to shutdown your |
| current kernel, and to start another kernel. It is like a reboot |
| but it is independent of the system firmware. And like a reboot |
| you can start any kernel with it, not just Linux. |
| |
| The name comes from the similarity to the exec system call. |
| |
| It is an ongoing process to be certain the hardware in a machine |
| is properly shutdown, so do not be surprised if this code does not |
| initially work for you. As of this writing the exact hardware |
| interface is strongly in flux, so no good recommendation can be |
| made. |
| |
| config CRASH_DUMP |
| bool "kernel crash dumps" |
| depends on X86_64 || (X86_32 && HIGHMEM) |
| ---help--- |
| Generate crash dump after being started by kexec. |
| This should be normally only set in special crash dump kernels |
| which are loaded in the main kernel with kexec-tools into |
| a specially reserved region and then later executed after |
| a crash by kdump/kexec. The crash dump kernel must be compiled |
| to a memory address not used by the main kernel or BIOS using |
| PHYSICAL_START, or it must be built as a relocatable image |
| (CONFIG_RELOCATABLE=y). |
| For more details see Documentation/kdump/kdump.txt |
| |
| config KEXEC_JUMP |
| bool "kexec jump" |
| depends on KEXEC && HIBERNATION |
| ---help--- |
| Jump between original kernel and kexeced kernel and invoke |
| code in physical address mode via KEXEC |
| |
| config PHYSICAL_START |
| hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP) |
| default "0x1000000" |
| ---help--- |
| This gives the physical address where the kernel is loaded. |
| |
| If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then |
| bzImage will decompress itself to above physical address and |
| run from there. Otherwise, bzImage will run from the address where |
| it has been loaded by the boot loader and will ignore above physical |
| address. |
| |
| In normal kdump cases one does not have to set/change this option |
| as now bzImage can be compiled as a completely relocatable image |
| (CONFIG_RELOCATABLE=y) and be used to load and run from a different |
| address. This option is mainly useful for the folks who don't want |
| to use a bzImage for capturing the crash dump and want to use a |
| vmlinux instead. vmlinux is not relocatable hence a kernel needs |
| to be specifically compiled to run from a specific memory area |
| (normally a reserved region) and this option comes handy. |
| |
| So if you are using bzImage for capturing the crash dump, |
| leave the value here unchanged to 0x1000000 and set |
| CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux |
| for capturing the crash dump change this value to start of |
| the reserved region. In other words, it can be set based on |
| the "X" value as specified in the "crashkernel=YM@XM" |
| command line boot parameter passed to the panic-ed |
| kernel. Please take a look at Documentation/kdump/kdump.txt |
| for more details about crash dumps. |
| |
| Usage of bzImage for capturing the crash dump is recommended as |
| one does not have to build two kernels. Same kernel can be used |
| as production kernel and capture kernel. Above option should have |
| gone away after relocatable bzImage support is introduced. But it |
| is present because there are users out there who continue to use |
| vmlinux for dump capture. This option should go away down the |
| line. |
| |
| Don't change this unless you know what you are doing. |
| |
| config RELOCATABLE |
| bool "Build a relocatable kernel" |
| default y |
| ---help--- |
| This builds a kernel image that retains relocation information |
| so it can be loaded someplace besides the default 1MB. |
| The relocations tend to make the kernel binary about 10% larger, |
| but are discarded at runtime. |
| |
| One use is for the kexec on panic case where the recovery kernel |
| must live at a different physical address than the primary |
| kernel. |
| |
| Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address |
| it has been loaded at and the compile time physical address |
| (CONFIG_PHYSICAL_START) is used as the minimum location. |
| |
| config RANDOMIZE_BASE |
| bool "Randomize the address of the kernel image" |
| depends on RELOCATABLE |
| depends on !HIBERNATION |
| default n |
| ---help--- |
| Randomizes the physical and virtual address at which the |
| kernel image is decompressed, as a security feature that |
| deters exploit attempts relying on knowledge of the location |
| of kernel internals. |
| |
| Entropy is generated using the RDRAND instruction if it is |
| supported. If RDTSC is supported, it is used as well. If |
| neither RDRAND nor RDTSC are supported, then randomness is |
| read from the i8254 timer. |
| |
| The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET, |
| and aligned according to PHYSICAL_ALIGN. Since the kernel is |
| built using 2GiB addressing, and PHYSICAL_ALGIN must be at a |
| minimum of 2MiB, only 10 bits of entropy is theoretically |
| possible. At best, due to page table layouts, 64-bit can use |
| 9 bits of entropy and 32-bit uses 8 bits. |
| |
| If unsure, say N. |
| |
| config RANDOMIZE_BASE_MAX_OFFSET |
| hex "Maximum kASLR offset allowed" if EXPERT |
| depends on RANDOMIZE_BASE |
| range 0x0 0x20000000 if X86_32 |
| default "0x20000000" if X86_32 |
| range 0x0 0x40000000 if X86_64 |
| default "0x40000000" if X86_64 |
| ---help--- |
| The lesser of RANDOMIZE_BASE_MAX_OFFSET and available physical |
| memory is used to determine the maximal offset in bytes that will |
| be applied to the kernel when kernel Address Space Layout |
| Randomization (kASLR) is active. This must be a multiple of |
| PHYSICAL_ALIGN. |
| |
| On 32-bit this is limited to 512MiB by page table layouts. The |
| default is 512MiB. |
| |
| On 64-bit this is limited by how the kernel fixmap page table is |
| positioned, so this cannot be larger than 1GiB currently. Without |
| RANDOMIZE_BASE, there is a 512MiB to 1.5GiB split between kernel |
| and modules. When RANDOMIZE_BASE_MAX_OFFSET is above 512MiB, the |
| modules area will shrink to compensate, up to the current maximum |
| 1GiB to 1GiB split. The default is 1GiB. |
| |
| If unsure, leave at the default value. |
| |
| # Relocation on x86 needs some additional build support |
| config X86_NEED_RELOCS |
| def_bool y |
| depends on RANDOMIZE_BASE || (X86_32 && RELOCATABLE) |
| |
| config PHYSICAL_ALIGN |
| hex "Alignment value to which kernel should be aligned" |
| default "0x200000" |
| range 0x2000 0x1000000 if X86_32 |
| range 0x200000 0x1000000 if X86_64 |
| ---help--- |
| This value puts the alignment restrictions on physical address |
| where kernel is loaded and run from. Kernel is compiled for an |
| address which meets above alignment restriction. |
| |
| If bootloader loads the kernel at a non-aligned address and |
| CONFIG_RELOCATABLE is set, kernel will move itself to nearest |
| address aligned to above value and run from there. |
| |
| If bootloader loads the kernel at a non-aligned address and |
| CONFIG_RELOCATABLE is not set, kernel will ignore the run time |
| load address and decompress itself to the address it has been |
| compiled for and run from there. The address for which kernel is |
| compiled already meets above alignment restrictions. Hence the |
| end result is that kernel runs from a physical address meeting |
| above alignment restrictions. |
| |
| On 32-bit this value must be a multiple of 0x2000. On 64-bit |
| this value must be a multiple of 0x200000. |
| |
| Don't change this unless you know what you are doing. |
| |
| config HOTPLUG_CPU |
| bool "Support for hot-pluggable CPUs" |
| depends on SMP |
| ---help--- |
| Say Y here to allow turning CPUs off and on. CPUs can be |
| controlled through /sys/devices/system/cpu. |
| ( Note: power management support will enable this option |
| automatically on SMP systems. ) |
| Say N if you want to disable CPU hotplug. |
| |
| config BOOTPARAM_HOTPLUG_CPU0 |
| bool "Set default setting of cpu0_hotpluggable" |
| default n |
| depends on HOTPLUG_CPU |
| ---help--- |
| Set whether default state of cpu0_hotpluggable is on or off. |
| |
| Say Y here to enable CPU0 hotplug by default. If this switch |
| is turned on, there is no need to give cpu0_hotplug kernel |
| parameter and the CPU0 hotplug feature is enabled by default. |
| |
| Please note: there are two known CPU0 dependencies if you want |
| to enable the CPU0 hotplug feature either by this switch or by |
| cpu0_hotplug kernel parameter. |
| |
| First, resume from hibernate or suspend always starts from CPU0. |
| So hibernate and suspend are prevented if CPU0 is offline. |
| |
| Second dependency is PIC interrupts always go to CPU0. CPU0 can not |
| offline if any interrupt can not migrate out of CPU0. There may |
| be other CPU0 dependencies. |
| |
| Please make sure the dependencies are under your control before |
| you enable this feature. |
| |
| Say N if you don't want to enable CPU0 hotplug feature by default. |
| You still can enable the CPU0 hotplug feature at boot by kernel |
| parameter cpu0_hotplug. |
| |
| config DEBUG_HOTPLUG_CPU0 |
| def_bool n |
| prompt "Debug CPU0 hotplug" |
| depends on HOTPLUG_CPU |
| ---help--- |
| Enabling this option offlines CPU0 (if CPU0 can be offlined) as |
| soon as possible and boots up userspace with CPU0 offlined. User |
| can online CPU0 back after boot time. |
| |
| To debug CPU0 hotplug, you need to enable CPU0 offline/online |
| feature by either turning on CONFIG_BOOTPARAM_HOTPLUG_CPU0 during |
| compilation or giving cpu0_hotplug kernel parameter at boot. |
| |
| If unsure, say N. |
| |
| config COMPAT_VDSO |
| def_bool y |
| prompt "Compat VDSO support" |
| depends on X86_32 || IA32_EMULATION |
| ---help--- |
| Map the 32-bit VDSO to the predictable old-style address too. |
| |
| Say N here if you are running a sufficiently recent glibc |
| version (2.3.3 or later), to remove the high-mapped |
| VDSO mapping and to exclusively use the randomized VDSO. |
| |
| If unsure, say Y. |
| |
| config CMDLINE_BOOL |
| bool "Built-in kernel command line" |
| ---help--- |
| Allow for specifying boot arguments to the kernel at |
| build time. On some systems (e.g. embedded ones), it is |
| necessary or convenient to provide some or all of the |
| kernel boot arguments with the kernel itself (that is, |
| to not rely on the boot loader to provide them.) |
| |
| To compile command line arguments into the kernel, |
| set this option to 'Y', then fill in the |
| the boot arguments in CONFIG_CMDLINE. |
| |
| Systems with fully functional boot loaders (i.e. non-embedded) |
| should leave this option set to 'N'. |
| |
| config CMDLINE |
| string "Built-in kernel command string" |
| depends on CMDLINE_BOOL |
| default "" |
| ---help--- |
| Enter arguments here that should be compiled into the kernel |
| image and used at boot time. If the boot loader provides a |
| command line at boot time, it is appended to this string to |
| form the full kernel command line, when the system boots. |
| |
| However, you can use the CONFIG_CMDLINE_OVERRIDE option to |
| change this behavior. |
| |
| In most cases, the command line (whether built-in or provided |
| by the boot loader) should specify the device for the root |
| file system. |
| |
| config CMDLINE_OVERRIDE |
| bool "Built-in command line overrides boot loader arguments" |
| depends on CMDLINE_BOOL |
| ---help--- |
| Set this option to 'Y' to have the kernel ignore the boot loader |
| command line, and use ONLY the built-in command line. |
| |
| This is used to work around broken boot loaders. This should |
| be set to 'N' under normal conditions. |
| |
| endmenu |
| |
| config ARCH_ENABLE_MEMORY_HOTPLUG |
| def_bool y |
| depends on X86_64 || (X86_32 && HIGHMEM) |
| |
| config ARCH_ENABLE_MEMORY_HOTREMOVE |
| def_bool y |
| depends on MEMORY_HOTPLUG |
| |
| config USE_PERCPU_NUMA_NODE_ID |
| def_bool y |
| depends on NUMA |
| |
| config ARCH_ENABLE_SPLIT_PMD_PTLOCK |
| def_bool y |
| depends on X86_64 || X86_PAE |
| |
| menu "Power management and ACPI options" |
| |
| config ARCH_HIBERNATION_HEADER |
| def_bool y |
| depends on X86_64 && HIBERNATION |
| |
| source "kernel/power/Kconfig" |
| |
| source "drivers/acpi/Kconfig" |
| |
| source "drivers/sfi/Kconfig" |
| |
| config X86_APM_BOOT |
| def_bool y |
| depends on APM |
| |
| menuconfig APM |
| tristate "APM (Advanced Power Management) BIOS support" |
| depends on X86_32 && PM_SLEEP |
| ---help--- |
| APM is a BIOS specification for saving power using several different |
| techniques. This is mostly useful for battery powered laptops with |
| APM compliant BIOSes. If you say Y here, the system time will be |
| reset after a RESUME operation, the /proc/apm device will provide |
| battery status information, and user-space programs will receive |
| notification of APM "events" (e.g. battery status change). |
| |
| If you select "Y" here, you can disable actual use of the APM |
| BIOS by passing the "apm=off" option to the kernel at boot time. |
| |
| Note that the APM support is almost completely disabled for |
| machines with more than one CPU. |
| |
| In order to use APM, you will need supporting software. For location |
| and more information, read <file:Documentation/power/apm-acpi.txt> |
| and the Battery Powered Linux mini-HOWTO, available from |
| <http://www.tldp.org/docs.html#howto>. |
| |
| This driver does not spin down disk drives (see the hdparm(8) |
| manpage ("man 8 hdparm") for that), and it doesn't turn off |
| VESA-compliant "green" monitors. |
| |
| This driver does not support the TI 4000M TravelMate and the ACER |
| 486/DX4/75 because they don't have compliant BIOSes. Many "green" |
| desktop machines also don't have compliant BIOSes, and this driver |
| may cause those machines to panic during the boot phase. |
| |
| Generally, if you don't have a battery in your machine, there isn't |
| much point in using this driver and you should say N. If you get |
| random kernel OOPSes or reboots that don't seem to be related to |
| anything, try disabling/enabling this option (or disabling/enabling |
| APM in your BIOS). |
| |
| Some other things you should try when experiencing seemingly random, |
| "weird" problems: |
| |
| 1) make sure that you have enough swap space and that it is |
| enabled. |
| 2) pass the "no-hlt" option to the kernel |
| 3) switch on floating point emulation in the kernel and pass |
| the "no387" option to the kernel |
| 4) pass the "floppy=nodma" option to the kernel |
| 5) pass the "mem=4M" option to the kernel (thereby disabling |
| all but the first 4 MB of RAM) |
| 6) make sure that the CPU is not over clocked. |
| 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/> |
| 8) disable the cache from your BIOS settings |
| 9) install a fan for the video card or exchange video RAM |
| 10) install a better fan for the CPU |
| 11) exchange RAM chips |
| 12) exchange the motherboard. |
| |
| To compile this driver as a module, choose M here: the |
| module will be called apm. |
| |
| if APM |
| |
| config APM_IGNORE_USER_SUSPEND |
| bool "Ignore USER SUSPEND" |
| ---help--- |
| This option will ignore USER SUSPEND requests. On machines with a |
| compliant APM BIOS, you want to say N. However, on the NEC Versa M |
| series notebooks, it is necessary to say Y because of a BIOS bug. |
| |
| config APM_DO_ENABLE |
| bool "Enable PM at boot time" |
| ---help--- |
| Enable APM features at boot time. From page 36 of the APM BIOS |
| specification: "When disabled, the APM BIOS does not automatically |
| power manage devices, enter the Standby State, enter the Suspend |
| State, or take power saving steps in response to CPU Idle calls." |
| This driver will make CPU Idle calls when Linux is idle (unless this |
| feature is turned off -- see "Do CPU IDLE calls", below). This |
| should always save battery power, but more complicated APM features |
| will be dependent on your BIOS implementation. You may need to turn |
| this option off if your computer hangs at boot time when using APM |
| support, or if it beeps continuously instead of suspending. Turn |
| this off if you have a NEC UltraLite Versa 33/C or a Toshiba |
| T400CDT. This is off by default since most machines do fine without |
| this feature. |
| |
| config APM_CPU_IDLE |
| depends on CPU_IDLE |
| bool "Make CPU Idle calls when idle" |
| ---help--- |
| Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop. |
| On some machines, this can activate improved power savings, such as |
| a slowed CPU clock rate, when the machine is idle. These idle calls |
| are made after the idle loop has run for some length of time (e.g., |
| 333 mS). On some machines, this will cause a hang at boot time or |
| whenever the CPU becomes idle. (On machines with more than one CPU, |
| this option does nothing.) |
| |
| config APM_DISPLAY_BLANK |
| bool "Enable console blanking using APM" |
| ---help--- |
| Enable console blanking using the APM. Some laptops can use this to |
| turn off the LCD backlight when the screen blanker of the Linux |
| virtual console blanks the screen. Note that this is only used by |
| the virtual console screen blanker, and won't turn off the backlight |
| when using the X Window system. This also doesn't have anything to |
| do with your VESA-compliant power-saving monitor. Further, this |
| option doesn't work for all laptops -- it might not turn off your |
| backlight at all, or it might print a lot of errors to the console, |
| especially if you are using gpm. |
| |
| config APM_ALLOW_INTS |
| bool "Allow interrupts during APM BIOS calls" |
| ---help--- |
| Normally we disable external interrupts while we are making calls to |
| the APM BIOS as a measure to lessen the effects of a badly behaving |
| BIOS implementation. The BIOS should reenable interrupts if it |
| needs to. Unfortunately, some BIOSes do not -- especially those in |
| many of the newer IBM Thinkpads. If you experience hangs when you |
| suspend, try setting this to Y. Otherwise, say N. |
| |
| endif # APM |
| |
| source "drivers/cpufreq/Kconfig" |
| |
| source "drivers/cpuidle/Kconfig" |
| |
| source "drivers/idle/Kconfig" |
| |
| endmenu |
| |
| |
| menu "Bus options (PCI etc.)" |
| |
| config PCI |
| bool "PCI support" |
| default y |
| ---help--- |
| Find out whether you have a PCI motherboard. PCI is the name of a |
| bus system, i.e. the way the CPU talks to the other stuff inside |
| your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or |
| VESA. If you have PCI, say Y, otherwise N. |
| |
| choice |
| prompt "PCI access mode" |
| depends on X86_32 && PCI |
| default PCI_GOANY |
| ---help--- |
| On PCI systems, the BIOS can be used to detect the PCI devices and |
| determine their configuration. However, some old PCI motherboards |
| have BIOS bugs and may crash if this is done. Also, some embedded |
| PCI-based systems don't have any BIOS at all. Linux can also try to |
| detect the PCI hardware directly without using the BIOS. |
| |
| With this option, you can specify how Linux should detect the |
| PCI devices. If you choose "BIOS", the BIOS will be used, |
| if you choose "Direct", the BIOS won't be used, and if you |
| choose "MMConfig", then PCI Express MMCONFIG will be used. |
| If you choose "Any", the kernel will try MMCONFIG, then the |
| direct access method and falls back to the BIOS if that doesn't |
| work. If unsure, go with the default, which is "Any". |
| |
| config PCI_GOBIOS |
| bool "BIOS" |
| |
| config PCI_GOMMCONFIG |
| bool "MMConfig" |
| |
| config PCI_GODIRECT |
| bool "Direct" |
| |
| config PCI_GOOLPC |
| bool "OLPC XO-1" |
| depends on OLPC |
| |
| config PCI_GOANY |
| bool "Any" |
| |
| endchoice |
| |
| config PCI_BIOS |
| def_bool y |
| depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY) |
| |
| # x86-64 doesn't support PCI BIOS access from long mode so always go direct. |
| config PCI_DIRECT |
| def_bool y |
| depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG)) |
| |
| config PCI_MMCONFIG |
| def_bool y |
| depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY) |
| |
| config PCI_OLPC |
| def_bool y |
| depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY) |
| |
| config PCI_XEN |
| def_bool y |
| depends on PCI && XEN |
| select SWIOTLB_XEN |
| |
| config PCI_DOMAINS |
| def_bool y |
| depends on PCI |
| |
| config PCI_MMCONFIG |
| bool "Support mmconfig PCI config space access" |
| depends on X86_64 && PCI && ACPI |
| |
| config PCI_CNB20LE_QUIRK |
| bool "Read CNB20LE Host Bridge Windows" if EXPERT |
| depends on PCI |
| help |
| Read the PCI windows out of the CNB20LE host bridge. This allows |
| PCI hotplug to work on systems with the CNB20LE chipset which do |
| not have ACPI. |
| |
| There's no public spec for this chipset, and this functionality |
| is known to be incomplete. |
| |
| You should say N unless you know you need this. |
| |
| source "drivers/pci/pcie/Kconfig" |
| |
| source "drivers/pci/Kconfig" |
| |
| # x86_64 have no ISA slots, but can have ISA-style DMA. |
| config ISA_DMA_API |
| bool "ISA-style DMA support" if (X86_64 && EXPERT) |
| default y |
| help |
| Enables ISA-style DMA support for devices requiring such controllers. |
| If unsure, say Y. |
| |
| if X86_32 |
| |
| config ISA |
| bool "ISA support" |
| ---help--- |
| Find out whether you have ISA slots on your motherboard. ISA is the |
| name of a bus system, i.e. the way the CPU talks to the other stuff |
| inside your box. Other bus systems are PCI, EISA, MicroChannel |
| (MCA) or VESA. ISA is an older system, now being displaced by PCI; |
| newer boards don't support it. If you have ISA, say Y, otherwise N. |
| |
| config EISA |
| bool "EISA support" |
| depends on ISA |
| ---help--- |
| The Extended Industry Standard Architecture (EISA) bus was |
| developed as an open alternative to the IBM MicroChannel bus. |
| |
| The EISA bus provided some of the features of the IBM MicroChannel |
| bus while maintaining backward compatibility with cards made for |
| the older ISA bus. The EISA bus saw limited use between 1988 and |
| 1995 when it was made obsolete by the PCI bus. |
| |
| Say Y here if you are building a kernel for an EISA-based machine. |
| |
| Otherwise, say N. |
| |
| source "drivers/eisa/Kconfig" |
| |
| config SCx200 |
| tristate "NatSemi SCx200 support" |
| ---help--- |
| This provides basic support for National Semiconductor's |
| (now AMD's) Geode processors. The driver probes for the |
| PCI-IDs of several on-chip devices, so its a good dependency |
| for other scx200_* drivers. |
| |
| If compiled as a module, the driver is named scx200. |
| |
| config SCx200HR_TIMER |
| tristate "NatSemi SCx200 27MHz High-Resolution Timer Support" |
| depends on SCx200 |
| default y |
| ---help--- |
| This driver provides a clocksource built upon the on-chip |
| 27MHz high-resolution timer. Its also a workaround for |
| NSC Geode SC-1100's buggy TSC, which loses time when the |
| processor goes idle (as is done by the scheduler). The |
| other workaround is idle=poll boot option. |
| |
| config OLPC |
| bool "One Laptop Per Child support" |
| depends on !X86_PAE |
| select GPIOLIB |
| select OF |
| select OF_PROMTREE |
| select IRQ_DOMAIN |
| ---help--- |
| Add support for detecting the unique features of the OLPC |
| XO hardware. |
| |
| config OLPC_XO1_PM |
| bool "OLPC XO-1 Power Management" |
| depends on OLPC && MFD_CS5535 && PM_SLEEP |
| select MFD_CORE |
| ---help--- |
| Add support for poweroff and suspend of the OLPC XO-1 laptop. |
| |
| config OLPC_XO1_RTC |
| bool "OLPC XO-1 Real Time Clock" |
| depends on OLPC_XO1_PM && RTC_DRV_CMOS |
| ---help--- |
| Add support for the XO-1 real time clock, which can be used as a |
| programmable wakeup source. |
| |
| config OLPC_XO1_SCI |
| bool "OLPC XO-1 SCI extras" |
| depends on OLPC && OLPC_XO1_PM |
| depends on INPUT=y |
| select POWER_SUPPLY |
| select GPIO_CS5535 |
| select MFD_CORE |
| ---help--- |
| Add support for SCI-based features of the OLPC XO-1 laptop: |
| - EC-driven system wakeups |
| - Power button |
| - Ebook switch |
| - Lid switch |
| - AC adapter status updates |
| - Battery status updates |
| |
| config OLPC_XO15_SCI |
| bool "OLPC XO-1.5 SCI extras" |
| depends on OLPC && ACPI |
| select POWER_SUPPLY |
| ---help--- |
| Add support for SCI-based features of the OLPC XO-1.5 laptop: |
| - EC-driven system wakeups |
| - AC adapter status updates |
| - Battery status updates |
| |
| config ALIX |
| bool "PCEngines ALIX System Support (LED setup)" |
| select GPIOLIB |
| ---help--- |
| This option enables system support for the PCEngines ALIX. |
| At present this just sets up LEDs for GPIO control on |
| ALIX2/3/6 boards. However, other system specific setup should |
| get added here. |
| |
| Note: You must still enable the drivers for GPIO and LED support |
| (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs |
| |
| Note: You have to set alix.force=1 for boards with Award BIOS. |
| |
| config NET5501 |
| bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)" |
| select GPIOLIB |
| ---help--- |
| This option enables system support for the Soekris Engineering net5501. |
| |
| config GEOS |
| bool "Traverse Technologies GEOS System Support (LEDS, GPIO, etc)" |
| select GPIOLIB |
| depends on DMI |
| ---help--- |
| This option enables system support for the Traverse Technologies GEOS. |
| |
| config TS5500 |
| bool "Technologic Systems TS-5500 platform support" |
| depends on MELAN |
| select CHECK_SIGNATURE |
| select NEW_LEDS |
| select LEDS_CLASS |
| ---help--- |
| This option enables system support for the Technologic Systems TS-5500. |
| |
| endif # X86_32 |
| |
| config AMD_NB |
| def_bool y |
| depends on CPU_SUP_AMD && PCI |
| |
| source "drivers/pcmcia/Kconfig" |
| |
| source "drivers/pci/hotplug/Kconfig" |
| |
| config RAPIDIO |
| tristate "RapidIO support" |
| depends on PCI |
| default n |
| help |
| If enabled this option will include drivers and the core |
| infrastructure code to support RapidIO interconnect devices. |
| |
| source "drivers/rapidio/Kconfig" |
| |
| config X86_SYSFB |
| bool "Mark VGA/VBE/EFI FB as generic system framebuffer" |
| help |
| Firmwares often provide initial graphics framebuffers so the BIOS, |
| bootloader or kernel can show basic video-output during boot for |
| user-guidance and debugging. Historically, x86 used the VESA BIOS |
| Extensions and EFI-framebuffers for this, which are mostly limited |
| to x86. |
| This option, if enabled, marks VGA/VBE/EFI framebuffers as generic |
| framebuffers so the new generic system-framebuffer drivers can be |
| used on x86. If the framebuffer is not compatible with the generic |
| modes, it is adverticed as fallback platform framebuffer so legacy |
| drivers like efifb, vesafb and uvesafb can pick it up. |
| If this option is not selected, all system framebuffers are always |
| marked as fallback platform framebuffers as usual. |
| |
| Note: Legacy fbdev drivers, including vesafb, efifb, uvesafb, will |
| not be able to pick up generic system framebuffers if this option |
| is selected. You are highly encouraged to enable simplefb as |
| replacement if you select this option. simplefb can correctly deal |
| with generic system framebuffers. But you should still keep vesafb |
| and others enabled as fallback if a system framebuffer is |
| incompatible with simplefb. |
| |
| If unsure, say Y. |
| |
| endmenu |
| |
| |
| menu "Executable file formats / Emulations" |
| |
| source "fs/Kconfig.binfmt" |
| |
| config IA32_EMULATION |
| bool "IA32 Emulation" |
| depends on X86_64 |
| select BINFMT_ELF |
| select COMPAT_BINFMT_ELF |
| select HAVE_UID16 |
| ---help--- |
| Include code to run legacy 32-bit programs under a |
| 64-bit kernel. You should likely turn this on, unless you're |
| 100% sure that you don't have any 32-bit programs left. |
| |
| config IA32_AOUT |
| tristate "IA32 a.out support" |
| depends on IA32_EMULATION |
| ---help--- |
| Support old a.out binaries in the 32bit emulation. |
| |
| config X86_X32 |
| bool "x32 ABI for 64-bit mode" |
| depends on X86_64 && IA32_EMULATION |
| ---help--- |
| Include code to run binaries for the x32 native 32-bit ABI |
| for 64-bit processors. An x32 process gets access to the |
| full 64-bit register file and wide data path while leaving |
| pointers at 32 bits for smaller memory footprint. |
| |
| You will need a recent binutils (2.22 or later) with |
| elf32_x86_64 support enabled to compile a kernel with this |
| option set. |
| |
| config COMPAT |
| def_bool y |
| depends on IA32_EMULATION || X86_X32 |
| select ARCH_WANT_OLD_COMPAT_IPC |
| |
| if COMPAT |
| config COMPAT_FOR_U64_ALIGNMENT |
| def_bool y |
| |
| config SYSVIPC_COMPAT |
| def_bool y |
| depends on SYSVIPC |
| |
| config KEYS_COMPAT |
| def_bool y |
| depends on KEYS |
| endif |
| |
| endmenu |
| |
| |
| config HAVE_ATOMIC_IOMAP |
| def_bool y |
| depends on X86_32 |
| |
| config X86_DEV_DMA_OPS |
| bool |
| depends on X86_64 || STA2X11 |
| |
| config X86_DMA_REMAP |
| bool |
| depends on STA2X11 |
| |
| config IOSF_MBI |
| bool |
| depends on PCI |
| ---help--- |
| To be selected by modules requiring access to the Intel OnChip System |
| Fabric (IOSF) Sideband MailBox Interface (MBI). For MBI platforms |
| enumerable by PCI. |
| |
| source "net/Kconfig" |
| |
| source "drivers/Kconfig" |
| |
| source "drivers/firmware/Kconfig" |
| |
| source "fs/Kconfig" |
| |
| source "arch/x86/Kconfig.debug" |
| |
| source "security/Kconfig" |
| |
| source "crypto/Kconfig" |
| |
| source "arch/x86/kvm/Kconfig" |
| |
| source "lib/Kconfig" |
