Merge patch series "riscv: Introduce compat-mode helpers & improve arch_get_mmap_end()"

[sfrench/cifs-2.6.git] / arch / riscv / 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 ACPI_GENERIC_GSI if ACPI
        select ACPI_REDUCED_HARDWARE_ONLY if ACPI
        select ARCH_DMA_DEFAULT_COHERENT
        select ARCH_ENABLE_HUGEPAGE_MIGRATION if HUGETLB_PAGE && MIGRATION
        select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
        select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE
        select ARCH_HAS_BINFMT_FLAT
        select ARCH_HAS_CURRENT_STACK_POINTER
        select ARCH_HAS_DEBUG_VIRTUAL if MMU
        select ARCH_HAS_DEBUG_VM_PGTABLE
        select ARCH_HAS_DEBUG_WX
        select ARCH_HAS_FORTIFY_SOURCE
        select ARCH_HAS_GCOV_PROFILE_ALL
        select ARCH_HAS_GIGANTIC_PAGE
        select ARCH_HAS_KCOV
        select ARCH_HAS_MEMBARRIER_CALLBACKS
        select ARCH_HAS_MEMBARRIER_SYNC_CORE
        select ARCH_HAS_MMIOWB
        select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
        select ARCH_HAS_PMEM_API
        select ARCH_HAS_PREPARE_SYNC_CORE_CMD
        select ARCH_HAS_PTE_SPECIAL
        select ARCH_HAS_SET_DIRECT_MAP if MMU
        select ARCH_HAS_SET_MEMORY if MMU
        select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL
        select ARCH_HAS_STRICT_MODULE_RWX if MMU && !XIP_KERNEL
        select ARCH_HAS_SYNC_CORE_BEFORE_USERMODE
        select ARCH_HAS_SYSCALL_WRAPPER
        select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
        select ARCH_HAS_UBSAN_SANITIZE_ALL
        select ARCH_HAS_VDSO_DATA
        select ARCH_KEEP_MEMBLOCK if ACPI
        select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
        select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
        select ARCH_STACKWALK
        select ARCH_SUPPORTS_ATOMIC_RMW
        select ARCH_SUPPORTS_CFI_CLANG
        select ARCH_SUPPORTS_DEBUG_PAGEALLOC if MMU
        select ARCH_SUPPORTS_HUGETLBFS if MMU
        # LLD >= 14: https://github.com/llvm/llvm-project/issues/50505
        select ARCH_SUPPORTS_LTO_CLANG if LLD_VERSION >= 140000
        select ARCH_SUPPORTS_LTO_CLANG_THIN if LLD_VERSION >= 140000
        select ARCH_SUPPORTS_PAGE_TABLE_CHECK if MMU
        select ARCH_SUPPORTS_PER_VMA_LOCK if MMU
        select ARCH_SUPPORTS_SHADOW_CALL_STACK if HAVE_SHADOW_CALL_STACK
        select ARCH_USE_MEMTEST
        select ARCH_USE_QUEUED_RWLOCKS
        select ARCH_USES_CFI_TRAPS if CFI_CLANG
        select ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH if SMP && MMU
        select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
        select ARCH_WANT_FRAME_POINTERS
        select ARCH_WANT_GENERAL_HUGETLB if !RISCV_ISA_SVNAPOT
        select ARCH_WANT_HUGE_PMD_SHARE if 64BIT
        select ARCH_WANT_LD_ORPHAN_WARN if !XIP_KERNEL
        select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
        select ARCH_WANTS_NO_INSTR
        select ARCH_WANTS_THP_SWAP if HAVE_ARCH_TRANSPARENT_HUGEPAGE
        select BINFMT_FLAT_NO_DATA_START_OFFSET if !MMU
        select BUILDTIME_TABLE_SORT if MMU
        select CLINT_TIMER if !MMU
        select CLONE_BACKWARDS
        select COMMON_CLK
        select CPU_PM if CPU_IDLE || HIBERNATION || SUSPEND
        select EDAC_SUPPORT
        select FRAME_POINTER if PERF_EVENTS || (FUNCTION_TRACER && !DYNAMIC_FTRACE)
        select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY if DYNAMIC_FTRACE
        select GENERIC_ARCH_TOPOLOGY
        select GENERIC_ATOMIC64 if !64BIT
        select GENERIC_CLOCKEVENTS_BROADCAST if SMP
        select GENERIC_CPU_DEVICES
        select GENERIC_EARLY_IOREMAP
        select GENERIC_ENTRY
        select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO
        select GENERIC_IDLE_POLL_SETUP
        select GENERIC_IOREMAP if MMU
        select GENERIC_IRQ_IPI if SMP
        select GENERIC_IRQ_IPI_MUX if SMP
        select GENERIC_IRQ_MULTI_HANDLER
        select GENERIC_IRQ_SHOW
        select GENERIC_IRQ_SHOW_LEVEL
        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_TIME_VSYSCALL if MMU && 64BIT
        select GENERIC_VDSO_TIME_NS if HAVE_GENERIC_VDSO
        select HARDIRQS_SW_RESEND
        select HAS_IOPORT if MMU
        select HAVE_ARCH_AUDITSYSCALL
        select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP
        select HAVE_ARCH_HUGE_VMAP if MMU && 64BIT && !XIP_KERNEL
        select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
        select HAVE_ARCH_JUMP_LABEL_RELATIVE if !XIP_KERNEL
        select HAVE_ARCH_KASAN if MMU && 64BIT
        select HAVE_ARCH_KASAN_VMALLOC if MMU && 64BIT
        select HAVE_ARCH_KFENCE if MMU && 64BIT
        select HAVE_ARCH_KGDB if !XIP_KERNEL
        select HAVE_ARCH_KGDB_QXFER_PKT
        select HAVE_ARCH_MMAP_RND_BITS if MMU
        select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
        select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
        select HAVE_ARCH_SECCOMP_FILTER
        select HAVE_ARCH_THREAD_STRUCT_WHITELIST
        select HAVE_ARCH_TRACEHOOK
        select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT && MMU
        select HAVE_ARCH_USERFAULTFD_MINOR if 64BIT && USERFAULTFD
        select HAVE_ARCH_VMAP_STACK if MMU && 64BIT
        select HAVE_ASM_MODVERSIONS
        select HAVE_CONTEXT_TRACKING_USER
        select HAVE_DEBUG_KMEMLEAK
        select HAVE_DMA_CONTIGUOUS if MMU
        select HAVE_DYNAMIC_FTRACE if !XIP_KERNEL && MMU && (CLANG_SUPPORTS_DYNAMIC_FTRACE || GCC_SUPPORTS_DYNAMIC_FTRACE)
        select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
        select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE
        select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL
        select HAVE_FUNCTION_GRAPH_TRACER
        select HAVE_FUNCTION_GRAPH_RETVAL if HAVE_FUNCTION_GRAPH_TRACER
        select HAVE_FUNCTION_TRACER if !XIP_KERNEL && !PREEMPTION
        select HAVE_EBPF_JIT if MMU
        select HAVE_FAST_GUP if MMU
        select HAVE_FUNCTION_ARG_ACCESS_API
        select HAVE_FUNCTION_ERROR_INJECTION
        select HAVE_GCC_PLUGINS
        select HAVE_GENERIC_VDSO if MMU && 64BIT
        select HAVE_IRQ_TIME_ACCOUNTING
        select HAVE_KPROBES if !XIP_KERNEL
        select HAVE_KPROBES_ON_FTRACE if !XIP_KERNEL
        select HAVE_KRETPROBES if !XIP_KERNEL
        # https://github.com/ClangBuiltLinux/linux/issues/1881
        select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if !LD_IS_LLD
        select HAVE_MOVE_PMD
        select HAVE_MOVE_PUD
        select HAVE_PCI
        select HAVE_PERF_EVENTS
        select HAVE_PERF_REGS
        select HAVE_PERF_USER_STACK_DUMP
        select HAVE_POSIX_CPU_TIMERS_TASK_WORK
        select HAVE_PREEMPT_DYNAMIC_KEY if !XIP_KERNEL
        select HAVE_REGS_AND_STACK_ACCESS_API
        select HAVE_RETHOOK if !XIP_KERNEL
        select HAVE_RSEQ
        select HAVE_SAMPLE_FTRACE_DIRECT
        select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
        select HAVE_STACKPROTECTOR
        select HAVE_SYSCALL_TRACEPOINTS
        select HOTPLUG_CORE_SYNC_DEAD if HOTPLUG_CPU
        select IRQ_DOMAIN
        select IRQ_FORCED_THREADING
        select KASAN_VMALLOC if KASAN
        select LOCK_MM_AND_FIND_VMA
        select MMU_GATHER_RCU_TABLE_FREE if SMP && MMU
        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_ALTERNATIVE if !XIP_KERNEL
        select RISCV_INTC
        select RISCV_TIMER if RISCV_SBI
        select SIFIVE_PLIC
        select SPARSE_IRQ
        select SYSCTL_EXCEPTION_TRACE
        select THREAD_INFO_IN_TASK
        select TRACE_IRQFLAGS_SUPPORT
        select UACCESS_MEMCPY if !MMU
        select ZONE_DMA32 if 64BIT

config CLANG_SUPPORTS_DYNAMIC_FTRACE
        def_bool CC_IS_CLANG
        # https://github.com/llvm/llvm-project/commit/6ab8927931851bb42b2c93a00801dc499d7d9b1e
        depends on CLANG_VERSION >= 130000
        # https://github.com/ClangBuiltLinux/linux/issues/1817
        depends on AS_IS_GNU || (AS_IS_LLVM && (LD_IS_LLD || LD_VERSION >= 23600))

config GCC_SUPPORTS_DYNAMIC_FTRACE
        def_bool CC_IS_GCC
        depends on $(cc-option,-fpatchable-function-entry=8)

config HAVE_SHADOW_CALL_STACK
        def_bool $(cc-option,-fsanitize=shadow-call-stack)
        # https://github.com/riscv-non-isa/riscv-elf-psabi-doc/commit/a484e843e6eeb51f0cb7b8819e50da6d2444d769
        depends on $(ld-option,--no-relax-gp)

config RISCV_USE_LINKER_RELAXATION
        def_bool y
        # https://github.com/llvm/llvm-project/commit/6611d58f5bbcbec77262d392e2923e1d680f6985
        depends on !LD_IS_LLD || LLD_VERSION >= 150000

# https://github.com/llvm/llvm-project/commit/bbc0f99f3bc96f1db16f649fc21dd18e5b0918f6
config ARCH_HAS_BROKEN_DWARF5
        def_bool y
        depends on RISCV_USE_LINKER_RELAXATION
        # https://github.com/llvm/llvm-project/commit/1df5ea29b43690b6622db2cad7b745607ca4de6a
        depends on AS_IS_LLVM && AS_VERSION < 180000
        # https://github.com/llvm/llvm-project/commit/7ffabb61a5569444b5ac9322e22e5471cc5e4a77
        depends on LD_IS_LLD && LLD_VERSION < 180000

config ARCH_MMAP_RND_BITS_MIN
        default 18 if 64BIT
        default 8

config ARCH_MMAP_RND_COMPAT_BITS_MIN
        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

config ARCH_MMAP_RND_COMPAT_BITS_MAX
        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 PAGE_OFFSET
        hex
        default 0xC0000000 if 32BIT && MMU
        default 0x80000000 if !MMU
        default 0xff60000000000000 if 64BIT

config KASAN_SHADOW_OFFSET
        hex
        depends on KASAN_GENERIC
        default 0xdfffffff00000000 if 64BIT
        default 0xffffffff if 32BIT

config ARCH_FLATMEM_ENABLE
        def_bool !NUMA

config ARCH_SPARSEMEM_ENABLE
        def_bool y
        depends on MMU
        select SPARSEMEM_STATIC if 32BIT && SPARSEMEM
        select SPARSEMEM_VMEMMAP_ENABLE if 64BIT

config ARCH_SELECT_MEMORY_MODEL
        def_bool ARCH_SPARSEMEM_ENABLE

config ARCH_SUPPORTS_UPROBES
        def_bool y

config STACKTRACE_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 5 if 64BIT
        default 2

config LOCKDEP_SUPPORT
        def_bool y

config RISCV_DMA_NONCOHERENT
        bool
        select ARCH_HAS_DMA_PREP_COHERENT
        select ARCH_HAS_SETUP_DMA_OPS
        select ARCH_HAS_SYNC_DMA_FOR_CPU
        select ARCH_HAS_SYNC_DMA_FOR_DEVICE
        select DMA_BOUNCE_UNALIGNED_KMALLOC if SWIOTLB

config RISCV_NONSTANDARD_CACHE_OPS
        bool
        help
          This enables function pointer support for non-standard noncoherent
          systems to handle cache management.

config AS_HAS_INSN
        def_bool $(as-instr,.insn r 51$(comma) 0$(comma) 0$(comma) t0$(comma) t0$(comma) zero)

config AS_HAS_OPTION_ARCH
        # https://reviews.llvm.org/D123515
        def_bool y
        depends on $(as-instr, .option arch$(comma) +m)

source "arch/riscv/Kconfig.socs"
source "arch/riscv/Kconfig.errata"

menu "Platform type"

config NONPORTABLE
        bool "Allow configurations that result in non-portable kernels"
        help
          RISC-V kernel binaries are compatible between all known systems
          whenever possible, but there are some use cases that can only be
          satisfied by configurations that result in kernel binaries that are
          not portable between systems.

          Selecting N does not guarantee kernels will be portable to all known
          systems.  Selecting any of the options guarded by NONPORTABLE will
          result in kernel binaries that are unlikely to be portable between
          systems.

          If unsure, say N.

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"
        depends on NONPORTABLE
        select 32BIT
        select GENERIC_LIB_ASHLDI3
        select GENERIC_LIB_ASHRDI3
        select GENERIC_LIB_LSHRDI3
        select GENERIC_LIB_UCMPDI2

config ARCH_RV64I
        bool "RV64I"
        select 64BIT
        select ARCH_SUPPORTS_INT128 if CC_HAS_INT128
        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

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 SCHED_MC
        bool "Multi-core scheduler support"
        depends on SMP
        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.

config NR_CPUS
        int "Maximum number of CPUs (2-512)"
        depends on SMP
        range 2 512 if !RISCV_SBI_V01
        range 2 32 if RISCV_SBI_V01 && 32BIT
        range 2 64 if RISCV_SBI_V01 && 64BIT
        default "32" if 32BIT
        default "64" if 64BIT

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 && MMU
        select ARCH_SUPPORTS_NUMA_BALANCING
        select GENERIC_ARCH_NUMA
        select HAVE_SETUP_PER_CPU_AREA
        select NEED_PER_CPU_EMBED_FIRST_CHUNK
        select NEED_PER_CPU_PAGE_FIRST_CHUNK
        select OF_NUMA
        select USE_PERCPU_NUMA_NODE_ID
        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 NUMA
        help
          Specify the maximum number of NUMA Nodes available on the target
          system.  Increases memory reserved to accommodate various tables.

config RISCV_ALTERNATIVE
        bool
        depends on !XIP_KERNEL
        help
          This Kconfig allows the kernel to automatically patch the
          erratum or cpufeature required by the execution platform at run
          time. The code patching overhead is minimal, as it's only done
          once at boot and once on each module load.

config RISCV_ALTERNATIVE_EARLY
        bool
        depends on RISCV_ALTERNATIVE
        help
          Allows early patching of the kernel for special errata

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.

config RISCV_ISA_SVNAPOT
        bool "Svnapot extension support for supervisor mode NAPOT pages"
        depends on 64BIT && MMU
        depends on RISCV_ALTERNATIVE
        default y
        help
          Allow kernel to detect the Svnapot ISA-extension dynamically at boot
          time and enable its usage.

          The Svnapot extension is used to mark contiguous PTEs as a range
          of contiguous virtual-to-physical translations for a naturally
          aligned power-of-2 (NAPOT) granularity larger than the base 4KB page
          size. When HUGETLBFS is also selected this option unconditionally
          allocates some memory for each NAPOT page size supported by the kernel.
          When optimizing for low memory consumption and for platforms without
          the Svnapot extension, it may be better to say N here.

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

config RISCV_ISA_SVPBMT
        bool "Svpbmt extension support for supervisor mode page-based memory types"
        depends on 64BIT && MMU
        depends on RISCV_ALTERNATIVE
        default y
        help
           Adds support to dynamically detect the presence of the Svpbmt
           ISA-extension (Supervisor-mode: page-based memory types) and
           enable its usage.

           The memory type for a page contains a combination of attributes
           that indicate the cacheability, idempotency, and ordering
           properties for access to that page.

           The Svpbmt extension is only available on 64-bit cpus.

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

config TOOLCHAIN_HAS_V
        bool
        default y
        depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64iv)
        depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32iv)
        depends on LLD_VERSION >= 140000 || LD_VERSION >= 23800
        depends on AS_HAS_OPTION_ARCH

config RISCV_ISA_V
        bool "VECTOR extension support"
        depends on TOOLCHAIN_HAS_V
        depends on FPU
        select DYNAMIC_SIGFRAME
        default y
        help
          Say N here if you want to disable all vector related procedure
          in the kernel.

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

config RISCV_ISA_V_DEFAULT_ENABLE
        bool "Enable userspace Vector by default"
        depends on RISCV_ISA_V
        default y
        help
          Say Y here if you want to enable Vector in userspace by default.
          Otherwise, userspace has to make explicit prctl() call to enable
          Vector, or enable it via the sysctl interface.

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

config RISCV_ISA_V_UCOPY_THRESHOLD
        int "Threshold size for vectorized user copies"
        depends on RISCV_ISA_V
        default 768
        help
          Prefer using vectorized copy_to_user()/copy_from_user() when the
          workload size exceeds this value.

config RISCV_ISA_V_PREEMPTIVE
        bool "Run kernel-mode Vector with kernel preemption"
        depends on PREEMPTION
        depends on RISCV_ISA_V
        default y
        help
          Usually, in-kernel SIMD routines are run with preemption disabled.
          Functions which envoke long running SIMD thus must yield core's
          vector unit to prevent blocking other tasks for too long.

          This config allows kernel to run SIMD without explicitly disable
          preemption. Enabling this config will result in higher memory
          consumption due to the allocation of per-task's kernel Vector context.

config TOOLCHAIN_HAS_ZBB
        bool
        default y
        depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zbb)
        depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zbb)
        depends on LLD_VERSION >= 150000 || LD_VERSION >= 23900
        depends on AS_HAS_OPTION_ARCH

# This symbol indicates that the toolchain supports all v1.0 vector crypto
# extensions, including Zvk*, Zvbb, and Zvbc.  LLVM added all of these at once.
# binutils added all except Zvkb, then added Zvkb.  So we just check for Zvkb.
config TOOLCHAIN_HAS_VECTOR_CRYPTO
        def_bool $(as-instr, .option arch$(comma) +v$(comma) +zvkb)
        depends on AS_HAS_OPTION_ARCH

config RISCV_ISA_ZBB
        bool "Zbb extension support for bit manipulation instructions"
        depends on TOOLCHAIN_HAS_ZBB
        depends on MMU
        depends on RISCV_ALTERNATIVE
        default y
        help
           Adds support to dynamically detect the presence of the ZBB
           extension (basic bit manipulation) and enable its usage.

           The Zbb extension provides instructions to accelerate a number
           of bit-specific operations (count bit population, sign extending,
           bitrotation, etc).

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

config RISCV_ISA_ZICBOM
        bool "Zicbom extension support for non-coherent DMA operation"
        depends on MMU
        depends on RISCV_ALTERNATIVE
        default y
        select RISCV_DMA_NONCOHERENT
        select DMA_DIRECT_REMAP
        help
           Adds support to dynamically detect the presence of the ZICBOM
           extension (Cache Block Management Operations) and enable its
           usage.

           The Zicbom extension can be used to handle for example
           non-coherent DMA support on devices that need it.

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

config RISCV_ISA_ZICBOZ
        bool "Zicboz extension support for faster zeroing of memory"
        depends on MMU
        depends on RISCV_ALTERNATIVE
        default y
        help
           Enable the use of the Zicboz extension (cbo.zero instruction)
           when available.

           The Zicboz extension is used for faster zeroing of memory.

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

config TOOLCHAIN_HAS_ZIHINTPAUSE
        bool
        default y
        depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zihintpause)
        depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zihintpause)
        depends on LLD_VERSION >= 150000 || LD_VERSION >= 23600

config TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI
        def_bool y
        # https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=aed44286efa8ae8717a77d94b51ac3614e2ca6dc
        # https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=98416dbb0a62579d4a7a4a76bab51b5b52fec2cd
        depends on AS_IS_GNU && AS_VERSION >= 23600
        help
          Binutils-2.38 and GCC-12.1.0 bumped the default ISA spec to the newer
          20191213 version, which moves some instructions from the I extension to
          the Zicsr and Zifencei extensions. This requires explicitly specifying
          Zicsr and Zifencei when binutils >= 2.38 or GCC >= 12.1.0. Zicsr
          and Zifencei are supported in binutils from version 2.36 onwards.
          To make life easier, and avoid forcing toolchains that default to a
          newer ISA spec to version 2.2, relax the check to binutils >= 2.36.
          For clang < 17 or GCC < 11.3.0, for which this is not possible or need
          special treatment, this is dealt with in TOOLCHAIN_NEEDS_OLD_ISA_SPEC.

config TOOLCHAIN_NEEDS_OLD_ISA_SPEC
        def_bool y
        depends on TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI
        # https://github.com/llvm/llvm-project/commit/22e199e6afb1263c943c0c0d4498694e15bf8a16
        # https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=d29f5d6ab513c52fd872f532c492e35ae9fd6671
        depends on (CC_IS_CLANG && CLANG_VERSION < 170000) || (CC_IS_GCC && GCC_VERSION < 110300)
        help
          Certain versions of clang and GCC do not support zicsr and zifencei via
          -march. This option causes an older ISA spec compatible with these older
          versions of clang and GCC to be passed to GAS, which has the same result
          as passing zicsr and zifencei to -march.

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.

config IRQ_STACKS
        bool "Independent irq & softirq stacks" if EXPERT
        default y
        select HAVE_IRQ_EXIT_ON_IRQ_STACK
        select HAVE_SOFTIRQ_ON_OWN_STACK
        help
          Add independent irq & softirq stacks for percpu to prevent kernel stack
          overflows. We may save some memory footprint by disabling IRQ_STACKS.

config THREAD_SIZE_ORDER
        int "Kernel stack size (in power-of-two numbers of page size)" if VMAP_STACK && EXPERT
        range 0 4
        default 1 if 32BIT && !KASAN
        default 3 if 64BIT && KASAN
        default 2
        help
          Specify the Pages of thread stack size (from 4KB to 64KB), which also
          affects irq stack size, which is equal to thread stack size.

config RISCV_MISALIGNED
        bool
        select SYSCTL_ARCH_UNALIGN_ALLOW
        help
          Embed support for emulating misaligned loads and stores.

choice
        prompt "Unaligned Accesses Support"
        default RISCV_PROBE_UNALIGNED_ACCESS
        help
          This determines the level of support for unaligned accesses. This
          information is used by the kernel to perform optimizations. It is also
          exposed to user space via the hwprobe syscall. The hardware will be
          probed at boot by default.

config RISCV_PROBE_UNALIGNED_ACCESS
        bool "Probe for hardware unaligned access support"
        select RISCV_MISALIGNED
        help
          During boot, the kernel will run a series of tests to determine the
          speed of unaligned accesses. This probing will dynamically determine
          the speed of unaligned accesses on the underlying system. If unaligned
          memory accesses trap into the kernel as they are not supported by the
          system, the kernel will emulate the unaligned accesses to preserve the
          UABI.

config RISCV_EMULATED_UNALIGNED_ACCESS
        bool "Emulate unaligned access where system support is missing"
        select RISCV_MISALIGNED
        help
          If unaligned memory accesses trap into the kernel as they are not
          supported by the system, the kernel will emulate the unaligned
          accesses to preserve the UABI. When the underlying system does support
          unaligned accesses, the unaligned accesses are assumed to be slow.

config RISCV_SLOW_UNALIGNED_ACCESS
        bool "Assume the system supports slow unaligned memory accesses"
        depends on NONPORTABLE
        help
          Assume that the system supports slow unaligned memory accesses. The
          kernel and userspace programs may not be able to run at all on systems
          that do not support unaligned memory accesses.

config RISCV_EFFICIENT_UNALIGNED_ACCESS
        bool "Assume the system supports fast unaligned memory accesses"
        depends on NONPORTABLE
        select DCACHE_WORD_ACCESS if MMU
        select HAVE_EFFICIENT_UNALIGNED_ACCESS
        help
          Assume that the system supports fast unaligned memory accesses. When
          enabled, this option improves the performance of the kernel on such
          systems. However, the kernel and userspace programs will run much more
          slowly, or will not be able to run at all, on systems that do not
          support efficient unaligned memory accesses.

endchoice

endmenu # "Platform type"

menu "Kernel features"

source "kernel/Kconfig.hz"

config RISCV_SBI_V01
        bool "SBI v0.1 support"
        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.

config RISCV_BOOT_SPINWAIT
        bool "Spinwait booting method"
        depends on SMP
        default y if RISCV_SBI_V01 || RISCV_M_MODE
        help
          This enables support for booting Linux via spinwait method. In the
          spinwait method, all cores randomly jump to Linux. One of the cores
          gets chosen via lottery and all other keep spinning on a percpu
          variable. This method cannot support CPU hotplug and sparse hartid
          scheme. It should be only enabled for M-mode Linux or platforms relying
          on older firmware without SBI HSM extension. All other platforms should
          rely on ordered booting via SBI HSM extension which gets chosen
          dynamically at runtime if the firmware supports it.

          Since spinwait is incompatible with sparse hart IDs, it requires
          NR_CPUS be large enough to contain the physical hart ID of the first
          hart to enter Linux.

          If unsure what to do here, say N.

config ARCH_SUPPORTS_KEXEC
        def_bool y

config ARCH_SELECTS_KEXEC
        def_bool y
        depends on KEXEC
        select HOTPLUG_CPU if SMP

config ARCH_SUPPORTS_KEXEC_FILE
        def_bool 64BIT

config ARCH_SELECTS_KEXEC_FILE
        def_bool y
        depends on KEXEC_FILE
        select HAVE_IMA_KEXEC if IMA
        select KEXEC_ELF

config ARCH_SUPPORTS_KEXEC_PURGATORY
        def_bool ARCH_SUPPORTS_KEXEC_FILE

config ARCH_SUPPORTS_CRASH_DUMP
        def_bool y

config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
        def_bool CRASH_CORE

config COMPAT
        bool "Kernel support for 32-bit U-mode"
        default 64BIT
        depends on 64BIT && MMU
        help
          This option enables support for a 32-bit U-mode running under a 64-bit
          kernel at S-mode. riscv32-specific components such as system calls,
          the user helper functions (vdso), signal rt_frame functions and the
          ptrace interface are handled appropriately by the kernel.

          If you want to execute 32-bit userspace applications, say Y.

config PARAVIRT
        bool "Enable paravirtualization code"
        depends on RISCV_SBI
        help
          This changes the kernel so it can modify itself when it is run
          under a hypervisor, potentially improving performance significantly
          over full virtualization.

config PARAVIRT_TIME_ACCOUNTING
        bool "Paravirtual steal time accounting"
        depends on PARAVIRT
        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 RELOCATABLE
        bool "Build a relocatable kernel"
        depends on MMU && 64BIT && !XIP_KERNEL
        help
          This builds a kernel as a Position Independent Executable (PIE),
          which retains all relocation metadata required to relocate the
          kernel binary at runtime to a different virtual address than the
          address it was linked at.
          Since RISCV uses the RELA relocation format, this requires a
          relocation pass at runtime even if the kernel is loaded at the
          same address it was linked at.

          If unsure, say N.

config RANDOMIZE_BASE
        bool "Randomize the address of the kernel image"
        select RELOCATABLE
        depends on MMU && 64BIT && !XIP_KERNEL
        help
          Randomizes the virtual address at which the kernel image is
          loaded, as a security feature that deters exploit attempts
          relying on knowledge of the location of kernel internals.

          It is the bootloader's job to provide entropy, by passing a
          random u64 value in /chosen/kaslr-seed at kernel entry.

          When booting via the UEFI stub, it will invoke the firmware's
          EFI_RNG_PROTOCOL implementation (if available) to supply entropy
          to the kernel proper. In addition, it will randomise the physical
          location of the kernel Image as well.

          If unsure, say N.

endmenu # "Kernel features"

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 && !XIP_KERNEL
        depends on MMU
        default y
        select ARCH_SUPPORTS_ACPI if 64BIT
        select EFI_GENERIC_STUB
        select EFI_PARAMS_FROM_FDT
        select EFI_RUNTIME_WRAPPERS
        select EFI_STUB
        select LIBFDT
        select RISCV_ISA_C
        select UCS2_STRING
        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 !RANDSTRUCT
        depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS

config PHYS_RAM_BASE_FIXED
        bool "Explicitly specified physical RAM address"
        depends on NONPORTABLE
        default n

config PHYS_RAM_BASE
        hex "Platform Physical RAM address"
        depends on PHYS_RAM_BASE_FIXED
        default "0x80000000"
        help
          This is the physical address of RAM in the system. It has to be
          explicitly specified to run early relocations of read-write data
          from flash to RAM.

config XIP_KERNEL
        bool "Kernel Execute-In-Place from ROM"
        depends on MMU && SPARSEMEM && NONPORTABLE
        # This prevents XIP from being enabled by all{yes,mod}config, which
        # fail to build since XIP doesn't support large kernels.
        depends on !COMPILE_TEST
        select PHYS_RAM_BASE_FIXED
        help
          Execute-In-Place allows the kernel to run from non-volatile storage
          directly addressable by the CPU, such as NOR flash. This saves RAM
          space since the text section of the kernel is not loaded from flash
          to RAM.  Read-write sections, such as the data section and stack,
          are still copied to RAM.  The XIP kernel is not compressed since
          it has to run directly from flash, so it will take more space to
          store it.  The flash address used to link the kernel object files,
          and for storing it, is configuration dependent. Therefore, if you
          say Y here, you must know the proper physical address where to
          store the kernel image depending on your own flash memory usage.

          Also note that the make target becomes "make xipImage" rather than
          "make zImage" or "make Image".  The final kernel binary to put in
          ROM memory will be arch/riscv/boot/xipImage.

          SPARSEMEM is required because the kernel text and rodata that are
          flash resident are not backed by memmap, then any attempt to get
          a struct page on those regions will trigger a fault.

          If unsure, say N.

config XIP_PHYS_ADDR
        hex "XIP Kernel Physical Location"
        depends on XIP_KERNEL
        default "0x21000000"
        help
          This is the physical address in your flash memory the kernel will
          be linked for and stored to.  This address is dependent on your
          own flash usage.

config RISCV_ISA_FALLBACK
        bool "Permit falling back to parsing riscv,isa for extension support by default"
        default y
        help
          Parsing the "riscv,isa" devicetree property has been deprecated and
          replaced by a list of explicitly defined strings. For compatibility
          with existing platforms, the kernel will fall back to parsing the
          "riscv,isa" property if the replacements are not found.

          Selecting N here will result in a kernel that does not use the
          fallback, unless the commandline "riscv_isa_fallback" parameter is
          present.

          Please see the dt-binding, located at
          Documentation/devicetree/bindings/riscv/extensions.yaml for details
          on the replacement properties, "riscv,isa-base" and
          "riscv,isa-extensions".

config BUILTIN_DTB
        bool "Built-in device tree"
        depends on OF && NONPORTABLE
        default y if XIP_KERNEL

endmenu # "Boot options"

config PORTABLE
        bool
        default !NONPORTABLE
        select EFI
        select MMU
        select OF

config ARCH_PROC_KCORE_TEXT
        def_bool y

menu "Power management options"

source "kernel/power/Kconfig"

config ARCH_HIBERNATION_POSSIBLE
        def_bool y

config ARCH_HIBERNATION_HEADER
        def_bool HIBERNATION

config ARCH_SUSPEND_POSSIBLE
        def_bool y

endmenu # "Power management options"

menu "CPU Power Management"

source "drivers/cpuidle/Kconfig"

source "drivers/cpufreq/Kconfig"

endmenu # "CPU Power Management"

source "arch/riscv/kvm/Kconfig"

source "drivers/acpi/Kconfig"