# 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_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_HAS_STRICT_MODULE_RWX if MMU select ARCH_HAS_DMA_PREP_COHERENT select ARCH_HAS_SYNC_DMA_FOR_CPU select ARCH_HAS_SYNC_DMA_FOR_DEVICE select ARCH_HAS_DMA_WRITE_COMBINE select ARCH_HAS_DMA_MMAP_PGPROT 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 CPU_PM if (SUSPEND || CPU_IDLE) select COMPAT_BINFMT_ELF if BINFMT_ELF && COMPAT select EDAC_SUPPORT select DMA_DIRECT_REMAP select GENERIC_ALLOCATOR select GENERIC_ARCH_TOPOLOGY if SMP select GENERIC_ATOMIC64 if !64BIT select GENERIC_CLOCKEVENTS 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_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_KGDB 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_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_FUTEX_CMPXCHG if FUTEX select HAVE_GCC_PLUGINS select HAVE_FUNCTION_ERROR_INJECTION select HAVE_EFFICIENT_UNALIGNED_ACCESS select HAVE_GENERIC_VDSO if MMU && 64BIT 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 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 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 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 KASAN_SHADOW_OFFSET hex depends on KASAN_GENERIC default 0xdfffffc800000000 if 64BIT default 0xffffffff if 32BIT config FORCE_MAX_ZONEORDER int "Maximum zone order" default 13 help The kernel memory allocator divides physically contiguous memory blocks into "zones", where each zone is a power of two number of pages. This option selects the largest power of two that the kernel keeps in the memory allocator. If you need to allocate very large blocks of physically contiguous memory, then you may need to increase this value. This config option is actually maximum order plus one. For example, a value of 13 means that the largest free memory block is 2^12 pages. config ARCH_FLATMEM_ENABLE def_bool y 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_WANT_GENERAL_HUGETLB def_bool y config ARCH_SUPPORTS_DEBUG_PAGEALLOC 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 RISCV_SWIOTLB 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 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 NO_SFENCE_VMA bool "Replace sfence.vma with CSR_SMCIR operation" config RISCV_SWIOTLB bool "Enable SWIOTLB" depends on MMU default y menu "supported PMU type" depends on PERF_EVENTS config RISCV_BASE_PMU bool "Base Performance Monitoring Unit" def_bool n 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. config VECTOR bool "VECTOR support" default n choice VECTOR_VERSION prompt "Vector Version" depends on VECTOR default VECTOR_1_0 config VECTOR_1_0 bool "VECTOR 1.0 support" help Say N here if you want to disable all vector 1.0 related procedure in the kernel. If you don't know what to do here, say Y. config VECTOR_0_7 bool "VECTOR 0.7 support" help Say N here if you want to disable all vector 0.7 related procedure in the kernel. If you don't know what to do here, say Y. endchoice config VLEN_256 bool "VECTOR VLEN 256" depends on VECTOR default n config VECTOR_EMU bool "VECTOR e64 emulate for c906 v1" depends on VECTOR default n config THEAD_ISA bool "T-HEAD extension ISA in AFLAGS with -march=_xtheadc" default n 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. config KEXEC bool "Kexec system call" select KEXEC_CORE select HOTPLUG_CPU if SMP depends on MMU default y help kexec is a system call that implements the ability to shutdown your current kernel, and to start another kernel. It is like a reboot but it is independent of the system firmware. And like a reboot you can start any kernel with it, not just Linux. The name comes from the similarity to the exec system call. config CRASH_DUMP bool "Build kdump crash kernel" default y help Generate crash dump after being started by kexec. This should be normally only set in special crash dump kernels which are loaded in the main kernel with kexec-tools into a specially reserved region and then later executed after a crash by kdump/kexec. For more details see Documentation/admin-guide/kdump/kdump.rst config COMPAT bool "Kernel support for 32-bit U-mode" 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 SYSVIPC_COMPAT def_bool y depends on COMPAT && SYSVIPC 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. endmenu config BUILTIN_DTB def_bool n depends on RISCV_M_MODE depends on OF menu "Power management options" source "drivers/cpuidle/Kconfig" source "drivers/cpufreq/Kconfig" source "kernel/power/Kconfig" config ARCH_SUSPEND_POSSIBLE def_bool y endmenu source "arch/riscv/kvm/Kconfig" source "drivers/firmware/Kconfig"