arch/riscv/Kconfig - linux - Git at Google


            
            # SPDX-License-Identifier: GPL-2.0-only

            
            #

            
            # For a description of the syntax of this configuration file,

            
            # see Documentation/kbuild/kconfig-language.rst.

            
            #


            config 64BIT

            
            	bool


            config 32BIT

            
            	bool


            config RISCV

            
            	def_bool y

            
            	select ARCH_CLOCKSOURCE_INIT

            
            	select ARCH_SUPPORTS_ATOMIC_RMW

            
            	select ARCH_SUPPORTS_DEBUG_PAGEALLOC if MMU

            
            	select ARCH_STACKWALK

            
            	select ARCH_HAS_BINFMT_FLAT

            
            	select ARCH_HAS_DEBUG_VM_PGTABLE

            
            	select ARCH_HAS_DEBUG_VIRTUAL if MMU

            
            	select ARCH_HAS_DEBUG_WX

            
            	select ARCH_HAS_GCOV_PROFILE_ALL

            
            	select ARCH_HAS_GIGANTIC_PAGE

            
            	select ARCH_HAS_KCOV

            
            	select ARCH_HAS_MMIOWB

            
            	select ARCH_HAS_PTE_SPECIAL

            
            	select ARCH_HAS_SET_DIRECT_MAP

            
            	select ARCH_HAS_SET_MEMORY

            
            	select ARCH_HAS_STRICT_KERNEL_RWX if MMU

            
            	select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX

            
            	select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT

            
            	select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU

            
            	select ARCH_WANT_FRAME_POINTERS

            
            	select ARCH_WANT_HUGE_PMD_SHARE if 64BIT

            
            	select CLONE_BACKWARDS

            
            	select CLINT_TIMER if !MMU

            
            	select COMMON_CLK

            
            	select EDAC_SUPPORT

            
            	select GENERIC_ARCH_TOPOLOGY if SMP

            
            	select GENERIC_ATOMIC64 if !64BIT

            
            	select GENERIC_EARLY_IOREMAP

            
            	select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO

            
            	select GENERIC_IOREMAP

            
            	select GENERIC_IRQ_MULTI_HANDLER

            
            	select GENERIC_IRQ_SHOW

            
            	select GENERIC_LIB_DEVMEM_IS_ALLOWED

            
            	select GENERIC_PCI_IOMAP

            
            	select GENERIC_PTDUMP if MMU

            
            	select GENERIC_SCHED_CLOCK

            
            	select GENERIC_SMP_IDLE_THREAD

            
            	select GENERIC_STRNCPY_FROM_USER if MMU

            
            	select GENERIC_STRNLEN_USER if MMU

            
            	select GENERIC_TIME_VSYSCALL if MMU && 64BIT

            
            	select HANDLE_DOMAIN_IRQ

            
            	select HAVE_ARCH_AUDITSYSCALL

            
            	select HAVE_ARCH_JUMP_LABEL

            
            	select HAVE_ARCH_JUMP_LABEL_RELATIVE

            
            	select HAVE_ARCH_KASAN if MMU && 64BIT

            
            	select HAVE_ARCH_KASAN_VMALLOC if MMU && 64BIT

            
            	select HAVE_ARCH_KGDB

            
            	select HAVE_ARCH_KGDB_QXFER_PKT

            
            	select HAVE_ARCH_MMAP_RND_BITS if MMU

            
            	select HAVE_ARCH_SECCOMP_FILTER

            
            	select HAVE_ARCH_TRACEHOOK

            
            	select HAVE_ASM_MODVERSIONS

            
            	select HAVE_CONTEXT_TRACKING

            
            	select HAVE_DEBUG_KMEMLEAK

            
            	select HAVE_DMA_CONTIGUOUS if MMU

            
            	select HAVE_EBPF_JIT if MMU

            
            	select HAVE_FUNCTION_ERROR_INJECTION

            
            	select HAVE_FUTEX_CMPXCHG if FUTEX

            
            	select HAVE_GCC_PLUGINS

            
            	select HAVE_GENERIC_VDSO if MMU && 64BIT

            
            	select HAVE_IRQ_TIME_ACCOUNTING

            
            	select HAVE_KPROBES

            
            	select HAVE_KPROBES_ON_FTRACE

            
            	select HAVE_KRETPROBES

            
            	select HAVE_PCI

            
            	select HAVE_PERF_EVENTS

            
            	select HAVE_PERF_REGS

            
            	select HAVE_PERF_USER_STACK_DUMP

            
            	select HAVE_REGS_AND_STACK_ACCESS_API

            
            	select HAVE_STACKPROTECTOR

            
            	select HAVE_SYSCALL_TRACEPOINTS

            
            	select IRQ_DOMAIN

            
            	select MODULES_USE_ELF_RELA if MODULES

            
            	select MODULE_SECTIONS if MODULES

            
            	select OF

            
            	select OF_EARLY_FLATTREE

            
            	select OF_IRQ

            
            	select PCI_DOMAINS_GENERIC if PCI

            
            	select PCI_MSI if PCI

            
            	select RISCV_INTC

            
            	select RISCV_TIMER if RISCV_SBI

            
            	select SPARSEMEM_STATIC if 32BIT

            
            	select SPARSE_IRQ

            
            	select SYSCTL_EXCEPTION_TRACE

            
            	select THREAD_INFO_IN_TASK

            
            	select UACCESS_MEMCPY if !MMU


            config ARCH_MMAP_RND_BITS_MIN

            
            	default 18 if 64BIT

            
            	default 8


            # max bits determined by the following formula:

            
            #  VA_BITS - PAGE_SHIFT - 3

            
            config ARCH_MMAP_RND_BITS_MAX

            
            	default 24 if 64BIT # SV39 based

            
            	default 17


            # set if we run in machine mode, cleared if we run in supervisor mode

            
            config RISCV_M_MODE

            
            	bool

            
            	default !MMU


            # set if we are running in S-mode and can use SBI calls

            
            config RISCV_SBI

            
            	bool

            
            	depends on !RISCV_M_MODE

            
            	default y


            config MMU

            
            	bool "MMU-based Paged Memory Management Support"

            
            	default y

            
            	help

            
            	  Select if you want MMU-based virtualised addressing space

            
            	  support by paged memory management. If unsure, say 'Y'.


            config ZONE_DMA32

            
            	bool

            
            	default y if 64BIT


            config VA_BITS

            
            	int

            
            	default 32 if 32BIT

            
            	default 39 if 64BIT


            config PA_BITS

            
            	int

            
            	default 34 if 32BIT

            
            	default 56 if 64BIT


            config PAGE_OFFSET

            
            	hex

            
            	default 0xC0000000 if 32BIT && MAXPHYSMEM_1GB

            
            	default 0x80000000 if 64BIT && !MMU

            
            	default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB

            
            	default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB


            config ARCH_FLATMEM_ENABLE

            
            	def_bool !NUMA


            config ARCH_SPARSEMEM_ENABLE

            
            	def_bool y

            
            	depends on MMU

            
            	select SPARSEMEM_VMEMMAP_ENABLE


            config ARCH_SELECT_MEMORY_MODEL

            
            	def_bool ARCH_SPARSEMEM_ENABLE


            config ARCH_WANT_GENERAL_HUGETLB

            
            	def_bool y


            config ARCH_SUPPORTS_UPROBES

            
            	def_bool y


            config SYS_SUPPORTS_HUGETLBFS

            
            	depends on MMU

            
            	def_bool y


            config STACKTRACE_SUPPORT

            
            	def_bool y


            config TRACE_IRQFLAGS_SUPPORT

            
            	def_bool y


            config GENERIC_BUG

            
            	def_bool y

            
            	depends on BUG

            
            	select GENERIC_BUG_RELATIVE_POINTERS if 64BIT


            config GENERIC_BUG_RELATIVE_POINTERS

            
            	bool


            config GENERIC_CALIBRATE_DELAY

            
            	def_bool y


            config GENERIC_CSUM

            
            	def_bool y


            config GENERIC_HWEIGHT

            
            	def_bool y


            config FIX_EARLYCON_MEM

            
            	def_bool MMU


            config PGTABLE_LEVELS

            
            	int

            
            	default 3 if 64BIT

            
            	default 2


            config LOCKDEP_SUPPORT

            
            	def_bool y


            source "arch/riscv/Kconfig.socs"


            menu "Platform type"


            choice

            
            	prompt "Base ISA"

            
            	default ARCH_RV64I

            
            	help

            
            	  This selects the base ISA that this kernel will target and must match

            
            	  the target platform.


            config ARCH_RV32I

            
            	bool "RV32I"

            
            	select 32BIT

            
            	select GENERIC_LIB_ASHLDI3

            
            	select GENERIC_LIB_ASHRDI3

            
            	select GENERIC_LIB_LSHRDI3

            
            	select GENERIC_LIB_UCMPDI2

            
            	select MMU


            config ARCH_RV64I

            
            	bool "RV64I"

            
            	select 64BIT

            
            	select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && GCC_VERSION >= 50000

            
            	select HAVE_DYNAMIC_FTRACE if MMU

            
            	select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE

            
            	select HAVE_FTRACE_MCOUNT_RECORD

            
            	select HAVE_FUNCTION_GRAPH_TRACER

            
            	select HAVE_FUNCTION_TRACER

            
            	select SWIOTLB if MMU


            endchoice


            # We must be able to map all physical memory into the kernel, but the compiler

            
            # is still a bit more efficient when generating code if it's setup in a manner

            
            # such that it can only map 2GiB of memory.

            
            choice

            
            	prompt "Kernel Code Model"

            
            	default CMODEL_MEDLOW if 32BIT

            
            	default CMODEL_MEDANY if 64BIT


            	config CMODEL_MEDLOW

            
            		bool "medium low code model"

            
            	config CMODEL_MEDANY

            
            		bool "medium any code model"

            
            endchoice


            config MODULE_SECTIONS

            
            	bool

            
            	select HAVE_MOD_ARCH_SPECIFIC


            choice

            
            	prompt "Maximum Physical Memory"

            
            	default MAXPHYSMEM_1GB if 32BIT

            
            	default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW

            
            	default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY


            	config MAXPHYSMEM_1GB

            
            		depends on 32BIT

            
            		bool "1GiB"

            
            	config MAXPHYSMEM_2GB

            
            		depends on 64BIT && CMODEL_MEDLOW

            
            		bool "2GiB"

            
            	config MAXPHYSMEM_128GB

            
            		depends on 64BIT && CMODEL_MEDANY

            
            		bool "128GiB"

            
            endchoice


            config SMP

            
            	bool "Symmetric Multi-Processing"

            
            	help

            
            	  This enables support for systems with more than one CPU.  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, single processor machines. On a single

            
            	  processor machine, the kernel will run faster if you say N

            
            	  here.


            	  If you don't know what to do here, say N.


            config NR_CPUS

            
            	int "Maximum number of CPUs (2-32)"

            
            	range 2 32

            
            	depends on SMP

            
            	default "8"


            config HOTPLUG_CPU

            
            	bool "Support for hot-pluggable CPUs"

            
            	depends on SMP

            
            	select GENERIC_IRQ_MIGRATION

            
            	help


            	  Say Y here to experiment with turning CPUs off and on.  CPUs

            
            	  can be controlled through /sys/devices/system/cpu.


            	  Say N if you want to disable CPU hotplug.


            choice

            
            	prompt "CPU Tuning"

            
            	default TUNE_GENERIC


            config TUNE_GENERIC

            
            	bool "generic"


            endchoice


            # Common NUMA Features

            
            config NUMA

            
            	bool "NUMA Memory Allocation and Scheduler Support"

            
            	depends on SMP

            
            	select GENERIC_ARCH_NUMA

            
            	select OF_NUMA

            
            	select ARCH_SUPPORTS_NUMA_BALANCING

            
            	help

            
            	  Enable NUMA (Non-Uniform Memory Access) support.


            	  The kernel will try to allocate memory used by a CPU on the

            
            	  local memory of the CPU and add some more NUMA awareness to the kernel.


            config NODES_SHIFT

            
            	int "Maximum NUMA Nodes (as a power of 2)"

            
            	range 1 10

            
            	default "2"

            
            	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 USE_PERCPU_NUMA_NODE_ID

            
            	def_bool y

            
            	depends on NUMA


            config NEED_PER_CPU_EMBED_FIRST_CHUNK

            
            	def_bool y

            
            	depends on NUMA


            config RISCV_ISA_C

            
            	bool "Emit compressed instructions when building Linux"

            
            	default y

            
            	help

            
            	   Adds "C" to the ISA subsets that the toolchain is allowed to emit

            
            	   when building Linux, which results in compressed instructions in the

            
            	   Linux binary.


            	   If you don't know what to do here, say Y.


            menu "supported PMU type"

            
            	depends on PERF_EVENTS


            config RISCV_BASE_PMU

            
            	bool "Base Performance Monitoring Unit"

            
            	def_bool y

            
            	help

            
            	  A base PMU that serves as a reference implementation and has limited

            
            	  feature of perf.  It can run on any RISC-V machines so serves as the

            
            	  fallback, but this option can also be disable to reduce kernel size.


            endmenu


            config FPU

            
            	bool "FPU support"

            
            	default y

            
            	help

            
            	  Say N here if you want to disable all floating-point related procedure

            
            	  in the kernel.


            	  If you don't know what to do here, say Y.


            endmenu


            menu "Kernel features"


            source "kernel/Kconfig.hz"


            config RISCV_SBI_V01

            
            	bool "SBI v0.1 support"

            
            	default y

            
            	depends on RISCV_SBI

            
            	help

            
            	  This config allows kernel to use SBI v0.1 APIs. This will be

            
            	  deprecated in future once legacy M-mode software are no longer in use.

            
            endmenu


            menu "Boot options"


            config CMDLINE

            
            	string "Built-in kernel command line"

            
            	help

            
            	  For most platforms, the arguments for the kernel's command line

            
            	  are provided at run-time, during boot. However, there are cases

            
            	  where either no arguments are being provided or the provided

            
            	  arguments are insufficient or even invalid.


            	  When that occurs, it is possible to define a built-in command

            
            	  line here and choose how the kernel should use it later on.


            choice

            
            	prompt "Built-in command line usage" if CMDLINE != ""

            
            	default CMDLINE_FALLBACK

            
            	help

            
            	  Choose how the kernel will handle the provided built-in command

            
            	  line.


            config CMDLINE_FALLBACK

            
            	bool "Use bootloader kernel arguments if available"

            
            	help

            
            	  Use the built-in command line as fallback in case we get nothing

            
            	  during boot. This is the default behaviour.


            config CMDLINE_EXTEND

            
            	bool "Extend bootloader kernel arguments"

            
            	help

            
            	  The command-line arguments provided during boot will be

            
            	  appended to the built-in command line. This is useful in

            
            	  cases where the provided arguments are insufficient and

            
            	  you don't want to or cannot modify them.


            config CMDLINE_FORCE

            
            	bool "Always use the default kernel command string"

            
            	help

            
            	  Always use the built-in command line, even if we get one during

            
            	  boot. This is useful in case you need to override the provided

            
            	  command line on systems where you don't have or want control

            
            	  over it.


            endchoice


            config EFI_STUB

            
            	bool


            config EFI

            
            	bool "UEFI runtime support"

            
            	depends on OF

            
            	select LIBFDT

            
            	select UCS2_STRING

            
            	select EFI_PARAMS_FROM_FDT

            
            	select EFI_STUB

            
            	select EFI_GENERIC_STUB

            
            	select EFI_RUNTIME_WRAPPERS

            
            	select RISCV_ISA_C

            
            	depends on MMU

            
            	default y

            
            	help

            
            	  This option provides support for runtime services provided

            
            	  by UEFI firmware (such as non-volatile variables, realtime

            
            	  clock, and platform reset). A UEFI stub is also provided to

            
            	  allow the kernel to be booted as an EFI application. This

            
            	  is only useful on systems that have UEFI firmware.


            config CC_HAVE_STACKPROTECTOR_TLS

            
            	def_bool $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=tp -mstack-protector-guard-offset=0)


            config STACKPROTECTOR_PER_TASK

            
            	def_bool y

            
            	depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS


            endmenu


            config BUILTIN_DTB

            
            	def_bool n

            
            	depends on OF


            menu "Power management options"


            source "kernel/power/Kconfig"


            endmenu


            source "drivers/firmware/Kconfig"
	# SPDX-License-Identifier: GPL-2.0-only
	#
	# For a description of the syntax of this configuration file,
	# see Documentation/kbuild/kconfig-language.rst.
	#

	config 64BIT
	bool

	config 32BIT
	bool

	config RISCV
	def_bool y
	select ARCH_CLOCKSOURCE_INIT
	select ARCH_SUPPORTS_ATOMIC_RMW
	select ARCH_SUPPORTS_DEBUG_PAGEALLOC if MMU
	select ARCH_STACKWALK
	select ARCH_HAS_BINFMT_FLAT
	select ARCH_HAS_DEBUG_VM_PGTABLE
	select ARCH_HAS_DEBUG_VIRTUAL if MMU
	select ARCH_HAS_DEBUG_WX
	select ARCH_HAS_GCOV_PROFILE_ALL
	select ARCH_HAS_GIGANTIC_PAGE
	select ARCH_HAS_KCOV
	select ARCH_HAS_MMIOWB
	select ARCH_HAS_PTE_SPECIAL
	select ARCH_HAS_SET_DIRECT_MAP
	select ARCH_HAS_SET_MEMORY
	select ARCH_HAS_STRICT_KERNEL_RWX if MMU
	select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
	select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
	select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
	select ARCH_WANT_FRAME_POINTERS
	select ARCH_WANT_HUGE_PMD_SHARE if 64BIT
	select CLONE_BACKWARDS
	select CLINT_TIMER if !MMU
	select COMMON_CLK
	select EDAC_SUPPORT
	select GENERIC_ARCH_TOPOLOGY if SMP
	select GENERIC_ATOMIC64 if !64BIT
	select GENERIC_EARLY_IOREMAP
	select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO
	select GENERIC_IOREMAP
	select GENERIC_IRQ_MULTI_HANDLER
	select GENERIC_IRQ_SHOW
	select GENERIC_LIB_DEVMEM_IS_ALLOWED
	select GENERIC_PCI_IOMAP
	select GENERIC_PTDUMP if MMU
	select GENERIC_SCHED_CLOCK
	select GENERIC_SMP_IDLE_THREAD
	select GENERIC_STRNCPY_FROM_USER if MMU
	select GENERIC_STRNLEN_USER if MMU
	select GENERIC_TIME_VSYSCALL if MMU && 64BIT
	select HANDLE_DOMAIN_IRQ
	select HAVE_ARCH_AUDITSYSCALL
	select HAVE_ARCH_JUMP_LABEL
	select HAVE_ARCH_JUMP_LABEL_RELATIVE
	select HAVE_ARCH_KASAN if MMU && 64BIT
	select HAVE_ARCH_KASAN_VMALLOC if MMU && 64BIT
	select HAVE_ARCH_KGDB
	select HAVE_ARCH_KGDB_QXFER_PKT
	select HAVE_ARCH_MMAP_RND_BITS if MMU
	select HAVE_ARCH_SECCOMP_FILTER
	select HAVE_ARCH_TRACEHOOK
	select HAVE_ASM_MODVERSIONS
	select HAVE_CONTEXT_TRACKING
	select HAVE_DEBUG_KMEMLEAK
	select HAVE_DMA_CONTIGUOUS if MMU
	select HAVE_EBPF_JIT if MMU
	select HAVE_FUNCTION_ERROR_INJECTION
	select HAVE_FUTEX_CMPXCHG if FUTEX
	select HAVE_GCC_PLUGINS
	select HAVE_GENERIC_VDSO if MMU && 64BIT
	select HAVE_IRQ_TIME_ACCOUNTING
	select HAVE_KPROBES
	select HAVE_KPROBES_ON_FTRACE
	select HAVE_KRETPROBES
	select HAVE_PCI
	select HAVE_PERF_EVENTS
	select HAVE_PERF_REGS
	select HAVE_PERF_USER_STACK_DUMP
	select HAVE_REGS_AND_STACK_ACCESS_API
	select HAVE_STACKPROTECTOR
	select HAVE_SYSCALL_TRACEPOINTS
	select IRQ_DOMAIN
	select MODULES_USE_ELF_RELA if MODULES
	select MODULE_SECTIONS if MODULES
	select OF
	select OF_EARLY_FLATTREE
	select OF_IRQ
	select PCI_DOMAINS_GENERIC if PCI
	select PCI_MSI if PCI
	select RISCV_INTC
	select RISCV_TIMER if RISCV_SBI
	select SPARSEMEM_STATIC if 32BIT
	select SPARSE_IRQ
	select SYSCTL_EXCEPTION_TRACE
	select THREAD_INFO_IN_TASK
	select UACCESS_MEMCPY if !MMU

	config ARCH_MMAP_RND_BITS_MIN
	default 18 if 64BIT
	default 8

	# max bits determined by the following formula:
	# VA_BITS - PAGE_SHIFT - 3
	config ARCH_MMAP_RND_BITS_MAX
	default 24 if 64BIT # SV39 based
	default 17

	# set if we run in machine mode, cleared if we run in supervisor mode
	config RISCV_M_MODE
	bool
	default !MMU

	# set if we are running in S-mode and can use SBI calls
	config RISCV_SBI
	bool
	depends on !RISCV_M_MODE
	default y

	config MMU
	bool "MMU-based Paged Memory Management Support"
	default y
	help
	Select if you want MMU-based virtualised addressing space
	support by paged memory management. If unsure, say 'Y'.

	config ZONE_DMA32
	bool
	default y if 64BIT

	config VA_BITS
	int
	default 32 if 32BIT
	default 39 if 64BIT

	config PA_BITS
	int
	default 34 if 32BIT
	default 56 if 64BIT

	config PAGE_OFFSET
	hex
	default 0xC0000000 if 32BIT && MAXPHYSMEM_1GB
	default 0x80000000 if 64BIT && !MMU
	default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB
	default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB

	config ARCH_FLATMEM_ENABLE
	def_bool !NUMA

	config ARCH_SPARSEMEM_ENABLE
	def_bool y
	depends on MMU
	select SPARSEMEM_VMEMMAP_ENABLE

	config ARCH_SELECT_MEMORY_MODEL
	def_bool ARCH_SPARSEMEM_ENABLE

	config ARCH_WANT_GENERAL_HUGETLB
	def_bool y

	config ARCH_SUPPORTS_UPROBES
	def_bool y

	config SYS_SUPPORTS_HUGETLBFS
	depends on MMU
	def_bool y

	config STACKTRACE_SUPPORT
	def_bool y

	config TRACE_IRQFLAGS_SUPPORT
	def_bool y

	config GENERIC_BUG
	def_bool y
	depends on BUG
	select GENERIC_BUG_RELATIVE_POINTERS if 64BIT

	config GENERIC_BUG_RELATIVE_POINTERS
	bool

	config GENERIC_CALIBRATE_DELAY
	def_bool y

	config GENERIC_CSUM
	def_bool y

	config GENERIC_HWEIGHT
	def_bool y

	config FIX_EARLYCON_MEM
	def_bool MMU

	config PGTABLE_LEVELS
	int
	default 3 if 64BIT
	default 2

	config LOCKDEP_SUPPORT
	def_bool y

	source "arch/riscv/Kconfig.socs"

	menu "Platform type"

	choice
	prompt "Base ISA"
	default ARCH_RV64I
	help
	This selects the base ISA that this kernel will target and must match
	the target platform.

	config ARCH_RV32I
	bool "RV32I"
	select 32BIT
	select GENERIC_LIB_ASHLDI3
	select GENERIC_LIB_ASHRDI3
	select GENERIC_LIB_LSHRDI3
	select GENERIC_LIB_UCMPDI2
	select MMU

	config ARCH_RV64I
	bool "RV64I"
	select 64BIT
	select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && GCC_VERSION >= 50000
	select HAVE_DYNAMIC_FTRACE if MMU
	select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE
	select HAVE_FTRACE_MCOUNT_RECORD
	select HAVE_FUNCTION_GRAPH_TRACER
	select HAVE_FUNCTION_TRACER
	select SWIOTLB if MMU

	endchoice

	# We must be able to map all physical memory into the kernel, but the compiler
	# is still a bit more efficient when generating code if it's setup in a manner
	# such that it can only map 2GiB of memory.
	choice
	prompt "Kernel Code Model"
	default CMODEL_MEDLOW if 32BIT
	default CMODEL_MEDANY if 64BIT

	config CMODEL_MEDLOW
	bool "medium low code model"
	config CMODEL_MEDANY
	bool "medium any code model"
	endchoice

	config MODULE_SECTIONS
	bool
	select HAVE_MOD_ARCH_SPECIFIC

	choice
	prompt "Maximum Physical Memory"
	default MAXPHYSMEM_1GB if 32BIT
	default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW
	default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY

	config MAXPHYSMEM_1GB
	depends on 32BIT
	bool "1GiB"
	config MAXPHYSMEM_2GB
	depends on 64BIT && CMODEL_MEDLOW
	bool "2GiB"
	config MAXPHYSMEM_128GB
	depends on 64BIT && CMODEL_MEDANY
	bool "128GiB"
	endchoice


	config SMP
	bool "Symmetric Multi-Processing"
	help
	This enables support for systems with more than one CPU. 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, single processor machines. On a single
	processor machine, the kernel will run faster if you say N
	here.

	If you don't know what to do here, say N.

	config NR_CPUS
	int "Maximum number of CPUs (2-32)"
	range 2 32
	depends on SMP
	default "8"

	config HOTPLUG_CPU
	bool "Support for hot-pluggable CPUs"
	depends on SMP
	select GENERIC_IRQ_MIGRATION
	help

	Say Y here to experiment with turning CPUs off and on. CPUs
	can be controlled through /sys/devices/system/cpu.

	Say N if you want to disable CPU hotplug.

	choice
	prompt "CPU Tuning"
	default TUNE_GENERIC

	config TUNE_GENERIC
	bool "generic"

	endchoice

	# Common NUMA Features
	config NUMA
	bool "NUMA Memory Allocation and Scheduler Support"
	depends on SMP
	select GENERIC_ARCH_NUMA
	select OF_NUMA
	select ARCH_SUPPORTS_NUMA_BALANCING
	help
	Enable NUMA (Non-Uniform Memory Access) support.

	The kernel will try to allocate memory used by a CPU on the
	local memory of the CPU and add some more NUMA awareness to the kernel.

	config NODES_SHIFT
	int "Maximum NUMA Nodes (as a power of 2)"
	range 1 10
	default "2"
	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 USE_PERCPU_NUMA_NODE_ID
	def_bool y
	depends on NUMA

	config NEED_PER_CPU_EMBED_FIRST_CHUNK
	def_bool y
	depends on NUMA

	config RISCV_ISA_C
	bool "Emit compressed instructions when building Linux"
	default y
	help
	Adds "C" to the ISA subsets that the toolchain is allowed to emit
	when building Linux, which results in compressed instructions in the
	Linux binary.

	If you don't know what to do here, say Y.

	menu "supported PMU type"
	depends on PERF_EVENTS

	config RISCV_BASE_PMU
	bool "Base Performance Monitoring Unit"
	def_bool y
	help
	A base PMU that serves as a reference implementation and has limited
	feature of perf. It can run on any RISC-V machines so serves as the
	fallback, but this option can also be disable to reduce kernel size.

	endmenu

	config FPU
	bool "FPU support"
	default y
	help
	Say N here if you want to disable all floating-point related procedure
	in the kernel.

	If you don't know what to do here, say Y.

	endmenu

	menu "Kernel features"

	source "kernel/Kconfig.hz"

	config RISCV_SBI_V01
	bool "SBI v0.1 support"
	default y
	depends on RISCV_SBI
	help
	This config allows kernel to use SBI v0.1 APIs. This will be
	deprecated in future once legacy M-mode software are no longer in use.
	endmenu

	menu "Boot options"

	config CMDLINE
	string "Built-in kernel command line"
	help
	For most platforms, the arguments for the kernel's command line
	are provided at run-time, during boot. However, there are cases
	where either no arguments are being provided or the provided
	arguments are insufficient or even invalid.

	When that occurs, it is possible to define a built-in command
	line here and choose how the kernel should use it later on.

	choice
	prompt "Built-in command line usage" if CMDLINE != ""
	default CMDLINE_FALLBACK
	help
	Choose how the kernel will handle the provided built-in command
	line.

	config CMDLINE_FALLBACK
	bool "Use bootloader kernel arguments if available"
	help
	Use the built-in command line as fallback in case we get nothing
	during boot. This is the default behaviour.

	config CMDLINE_EXTEND
	bool "Extend bootloader kernel arguments"
	help
	The command-line arguments provided during boot will be
	appended to the built-in command line. This is useful in
	cases where the provided arguments are insufficient and
	you don't want to or cannot modify them.


	config CMDLINE_FORCE
	bool "Always use the default kernel command string"
	help
	Always use the built-in command line, even if we get one during
	boot. This is useful in case you need to override the provided
	command line on systems where you don't have or want control
	over it.

	endchoice

	config EFI_STUB
	bool

	config EFI
	bool "UEFI runtime support"
	depends on OF
	select LIBFDT
	select UCS2_STRING
	select EFI_PARAMS_FROM_FDT
	select EFI_STUB
	select EFI_GENERIC_STUB
	select EFI_RUNTIME_WRAPPERS
	select RISCV_ISA_C
	depends on MMU
	default y
	help
	This option provides support for runtime services provided
	by UEFI firmware (such as non-volatile variables, realtime
	clock, and platform reset). A UEFI stub is also provided to
	allow the kernel to be booted as an EFI application. This
	is only useful on systems that have UEFI firmware.

	config CC_HAVE_STACKPROTECTOR_TLS
	def_bool $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=tp -mstack-protector-guard-offset=0)

	config STACKPROTECTOR_PER_TASK
	def_bool y
	depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS

	endmenu

	config BUILTIN_DTB
	def_bool n
	depends on OF

	menu "Power management options"

	source "kernel/power/Kconfig"

	endmenu

	source "drivers/firmware/Kconfig"