# SPDX-License-Identifier: GPL-2.0-only
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#
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# For a description of the syntax of this configuration file,
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# see Documentation/kbuild/kconfig-language.rst.
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#
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config 64BIT
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bool
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config 32BIT
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bool
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config RISCV
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def_bool y
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select ARCH_CLOCKSOURCE_INIT
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select ARCH_SUPPORTS_ATOMIC_RMW
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select ARCH_HAS_BINFMT_FLAT
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select ARCH_HAS_DEBUG_VM_PGTABLE
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select ARCH_HAS_DEBUG_VIRTUAL if MMU
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select ARCH_HAS_DEBUG_WX
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select ARCH_HAS_GCOV_PROFILE_ALL
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select ARCH_HAS_GIGANTIC_PAGE
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select ARCH_HAS_KCOV
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select ARCH_HAS_MMIOWB
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select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
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select ARCH_HAS_PTE_SPECIAL
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select ARCH_HAS_SET_DIRECT_MAP
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select ARCH_HAS_SET_MEMORY
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select ARCH_HAS_STRICT_KERNEL_RWX if MMU
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select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
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select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
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select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
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select ARCH_WANT_FRAME_POINTERS
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select ARCH_WANT_HUGE_PMD_SHARE if 64BIT
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select CLONE_BACKWARDS
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select CLINT_TIMER if !MMU
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select COMMON_CLK
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select EDAC_SUPPORT
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select GENERIC_ARCH_TOPOLOGY
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select GENERIC_ATOMIC64 if !64BIT
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select GENERIC_CLOCKEVENTS
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select GENERIC_EARLY_IOREMAP
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select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO
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select GENERIC_IOREMAP
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select GENERIC_IRQ_MULTI_HANDLER
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select GENERIC_IRQ_SHOW
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select GENERIC_PCI_IOMAP
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select GENERIC_PTDUMP if MMU
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select GENERIC_SCHED_CLOCK
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select GENERIC_SMP_IDLE_THREAD
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select GENERIC_STRNCPY_FROM_USER if MMU
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select GENERIC_STRNLEN_USER if MMU
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select GENERIC_TIME_VSYSCALL if MMU && 64BIT
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select HANDLE_DOMAIN_IRQ
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select HAVE_ARCH_AUDITSYSCALL
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select HAVE_ARCH_JUMP_LABEL
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select HAVE_ARCH_JUMP_LABEL_RELATIVE
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select HAVE_ARCH_KASAN if MMU && 64BIT
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select HAVE_ARCH_KGDB
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select HAVE_ARCH_KGDB_QXFER_PKT
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select HAVE_ARCH_MMAP_RND_BITS if MMU
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select HAVE_ARCH_SECCOMP_FILTER
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select HAVE_ARCH_TRACEHOOK
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select HAVE_ASM_MODVERSIONS
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select HAVE_CONTEXT_TRACKING
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select HAVE_DEBUG_KMEMLEAK
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select HAVE_DMA_CONTIGUOUS if MMU
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select HAVE_EBPF_JIT if MMU
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select HAVE_FUTEX_CMPXCHG if FUTEX
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select HAVE_GCC_PLUGINS
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select HAVE_GENERIC_VDSO if MMU && 64BIT
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select HAVE_PCI
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select HAVE_PERF_EVENTS
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select HAVE_PERF_REGS
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select HAVE_PERF_USER_STACK_DUMP
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select HAVE_STACKPROTECTOR
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select HAVE_SYSCALL_TRACEPOINTS
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select IRQ_DOMAIN
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select MODULES_USE_ELF_RELA if MODULES
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select MODULE_SECTIONS if MODULES
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select OF
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select OF_EARLY_FLATTREE
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select OF_IRQ
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select PCI_DOMAINS_GENERIC if PCI
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select PCI_MSI if PCI
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select RISCV_INTC
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select RISCV_TIMER if RISCV_SBI
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select SPARSE_IRQ
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select SYSCTL_EXCEPTION_TRACE
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select THREAD_INFO_IN_TASK
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select UACCESS_MEMCPY if !MMU
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config ARCH_MMAP_RND_BITS_MIN
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default 18 if 64BIT
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default 8
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# max bits determined by the following formula:
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# VA_BITS - PAGE_SHIFT - 3
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config ARCH_MMAP_RND_BITS_MAX
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default 24 if 64BIT # SV39 based
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default 17
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# set if we run in machine mode, cleared if we run in supervisor mode
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config RISCV_M_MODE
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bool
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default !MMU
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# set if we are running in S-mode and can use SBI calls
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config RISCV_SBI
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bool
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depends on !RISCV_M_MODE
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default y
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config MMU
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bool "MMU-based Paged Memory Management Support"
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default y
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help
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Select if you want MMU-based virtualised addressing space
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support by paged memory management. If unsure, say 'Y'.
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config ZONE_DMA32
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bool
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default y if 64BIT
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config VA_BITS
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int
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default 32 if 32BIT
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default 39 if 64BIT
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config PA_BITS
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int
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default 34 if 32BIT
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default 56 if 64BIT
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config PAGE_OFFSET
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hex
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default 0xC0000000 if 32BIT && MAXPHYSMEM_1GB
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default 0x80000000 if 64BIT && !MMU
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default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB
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default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB
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config KASAN_SHADOW_OFFSET
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hex
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depends on KASAN_GENERIC
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default 0xdfffffc800000000 if 64BIT
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default 0xffffffff if 32BIT
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config ARCH_FLATMEM_ENABLE
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def_bool y
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config ARCH_SPARSEMEM_ENABLE
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def_bool y
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depends on MMU
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select SPARSEMEM_STATIC if 32BIT && SPARSEMEM
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select SPARSEMEM_VMEMMAP_ENABLE if 64BIT
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config ARCH_SELECT_MEMORY_MODEL
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def_bool ARCH_SPARSEMEM_ENABLE
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config ARCH_WANT_GENERAL_HUGETLB
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def_bool y
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config ARCH_SUPPORTS_DEBUG_PAGEALLOC
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def_bool y
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config SYS_SUPPORTS_HUGETLBFS
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depends on MMU
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def_bool y
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config STACKTRACE_SUPPORT
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def_bool y
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config TRACE_IRQFLAGS_SUPPORT
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def_bool y
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config GENERIC_BUG
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def_bool y
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depends on BUG
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select GENERIC_BUG_RELATIVE_POINTERS if 64BIT
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config GENERIC_BUG_RELATIVE_POINTERS
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bool
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config GENERIC_CALIBRATE_DELAY
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def_bool y
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config GENERIC_CSUM
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def_bool y
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config GENERIC_HWEIGHT
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def_bool y
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config FIX_EARLYCON_MEM
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def_bool MMU
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config PGTABLE_LEVELS
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int
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default 3 if 64BIT
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default 2
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config LOCKDEP_SUPPORT
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def_bool y
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source "arch/riscv/Kconfig.socs"
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menu "Platform type"
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choice
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prompt "Base ISA"
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default ARCH_RV64I
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help
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This selects the base ISA that this kernel will target and must match
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the target platform.
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config ARCH_RV32I
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bool "RV32I"
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select 32BIT
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select GENERIC_LIB_ASHLDI3
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select GENERIC_LIB_ASHRDI3
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select GENERIC_LIB_LSHRDI3
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select GENERIC_LIB_UCMPDI2
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select MMU
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config ARCH_RV64I
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bool "RV64I"
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select 64BIT
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select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && GCC_VERSION >= 50000
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select HAVE_DYNAMIC_FTRACE if MMU
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select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE
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select HAVE_FTRACE_MCOUNT_RECORD
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select HAVE_FUNCTION_GRAPH_TRACER
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select HAVE_FUNCTION_TRACER
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select SWIOTLB if MMU
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endchoice
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# We must be able to map all physical memory into the kernel, but the compiler
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# is still a bit more efficient when generating code if it's setup in a manner
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# such that it can only map 2GiB of memory.
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choice
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prompt "Kernel Code Model"
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default CMODEL_MEDLOW if 32BIT
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default CMODEL_MEDANY if 64BIT
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config CMODEL_MEDLOW
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bool "medium low code model"
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config CMODEL_MEDANY
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bool "medium any code model"
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endchoice
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config MODULE_SECTIONS
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bool
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select HAVE_MOD_ARCH_SPECIFIC
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choice
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prompt "Maximum Physical Memory"
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default MAXPHYSMEM_1GB if 32BIT
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default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW
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default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY
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config MAXPHYSMEM_1GB
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depends on 32BIT
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bool "1GiB"
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config MAXPHYSMEM_2GB
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depends on 64BIT && CMODEL_MEDLOW
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bool "2GiB"
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config MAXPHYSMEM_128GB
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depends on 64BIT && CMODEL_MEDANY
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bool "128GiB"
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endchoice
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config SMP
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bool "Symmetric Multi-Processing"
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help
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This enables support for systems with more than one CPU. If
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you say N here, the kernel will run on single and
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multiprocessor machines, but will use only one CPU of a
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multiprocessor machine. If you say Y here, the kernel will run
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on many, but not all, single processor machines. On a single
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processor machine, the kernel will run faster if you say N
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here.
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If you don't know what to do here, say N.
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config NR_CPUS
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int "Maximum number of CPUs (2-32)"
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range 2 32
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depends on SMP
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default "8"
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config HOTPLUG_CPU
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bool "Support for hot-pluggable CPUs"
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depends on SMP
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select GENERIC_IRQ_MIGRATION
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help
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Say Y here to experiment with turning CPUs off and on. CPUs
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can be controlled through /sys/devices/system/cpu.
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Say N if you want to disable CPU hotplug.
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choice
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prompt "CPU Tuning"
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default TUNE_GENERIC
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config TUNE_GENERIC
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bool "generic"
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endchoice
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config RISCV_ISA_C
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bool "Emit compressed instructions when building Linux"
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default y
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help
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Adds "C" to the ISA subsets that the toolchain is allowed to emit
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when building Linux, which results in compressed instructions in the
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Linux binary.
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If you don't know what to do here, say Y.
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menu "supported PMU type"
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depends on PERF_EVENTS
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config RISCV_BASE_PMU
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bool "Base Performance Monitoring Unit"
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def_bool y
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help
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A base PMU that serves as a reference implementation and has limited
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feature of perf. It can run on any RISC-V machines so serves as the
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fallback, but this option can also be disable to reduce kernel size.
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endmenu
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config TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI
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def_bool y
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# https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=aed44286efa8ae8717a77d94b51ac3614e2ca6dc
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depends on AS_IS_GNU && AS_VERSION >= 23800
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help
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Newer binutils versions default to ISA spec version 20191213 which
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moves some instructions from the I extension to the Zicsr and Zifencei
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extensions.
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config TOOLCHAIN_NEEDS_OLD_ISA_SPEC
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def_bool y
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depends on TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI
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# https://github.com/llvm/llvm-project/commit/22e199e6afb1263c943c0c0d4498694e15bf8a16
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depends on CC_IS_CLANG && CLANG_VERSION < 170000
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help
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Certain versions of clang do not support zicsr and zifencei via -march
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but newer versions of binutils require it for the reasons noted in the
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help text of CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI. This
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option causes an older ISA spec compatible with these older versions
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of clang to be passed to GAS, which has the same result as passing zicsr
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and zifencei to -march.
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config FPU
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bool "FPU support"
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default y
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help
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Say N here if you want to disable all floating-point related procedure
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in the kernel.
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If you don't know what to do here, say Y.
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endmenu
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menu "Kernel features"
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source "kernel/Kconfig.hz"
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config RISCV_SBI_V01
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bool "SBI v0.1 support"
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default y
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depends on RISCV_SBI
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help
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This config allows kernel to use SBI v0.1 APIs. This will be
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deprecated in future once legacy M-mode software are no longer in use.
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endmenu
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menu "Boot options"
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config CMDLINE
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string "Built-in kernel command line"
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help
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For most platforms, the arguments for the kernel's command line
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are provided at run-time, during boot. However, there are cases
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where either no arguments are being provided or the provided
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arguments are insufficient or even invalid.
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When that occurs, it is possible to define a built-in command
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line here and choose how the kernel should use it later on.
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choice
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prompt "Built-in command line usage" if CMDLINE != ""
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default CMDLINE_FALLBACK
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help
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Choose how the kernel will handle the provided built-in command
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line.
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config CMDLINE_FALLBACK
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bool "Use bootloader kernel arguments if available"
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help
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Use the built-in command line as fallback in case we get nothing
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during boot. This is the default behaviour.
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config CMDLINE_EXTEND
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bool "Extend bootloader kernel arguments"
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help
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The command-line arguments provided during boot will be
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appended to the built-in command line. This is useful in
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cases where the provided arguments are insufficient and
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you don't want to or cannot modify them.
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config CMDLINE_FORCE
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bool "Always use the default kernel command string"
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help
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Always use the built-in command line, even if we get one during
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boot. This is useful in case you need to override the provided
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command line on systems where you don't have or want control
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over it.
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endchoice
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config EFI_STUB
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bool
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config EFI
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bool "UEFI runtime support"
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depends on OF
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select LIBFDT
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select UCS2_STRING
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select EFI_PARAMS_FROM_FDT
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select EFI_STUB
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select EFI_GENERIC_STUB
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select EFI_RUNTIME_WRAPPERS
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select RISCV_ISA_C
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depends on MMU
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default y
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help
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This option provides support for runtime services provided
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by UEFI firmware (such as non-volatile variables, realtime
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clock, and platform reset). A UEFI stub is also provided to
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allow the kernel to be booted as an EFI application. This
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is only useful on systems that have UEFI firmware.
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endmenu
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config BUILTIN_DTB
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def_bool n
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depends on RISCV_M_MODE
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depends on OF
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menu "Power management options"
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source "kernel/power/Kconfig"
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endmenu
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source "drivers/firmware/Kconfig"
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