| # 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_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 COMMON_CLK |
| select EDAC_SUPPORT |
| select GENERIC_ARCH_TOPOLOGY if SMP |
| select GENERIC_ATOMIC64 if !64BIT |
| select GENERIC_CLOCKEVENTS |
| 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_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_GENERIC_VDSO if MMU && 64BIT |
| select HAVE_PCI |
| select HAVE_PERF_EVENTS |
| select HAVE_PERF_REGS |
| select HAVE_PERF_USER_STACK_DUMP |
| 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 |
| select SPARSEMEM_STATIC if 32BIT |
| select SPARSE_IRQ |
| select SYSCTL_EXCEPTION_TRACE |
| select THREAD_INFO_IN_TASK |
| |
| 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_2GB |
| default 0x80000000 if 64BIT && !MMU |
| default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB |
| default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB |
| |
| config ARCH_FLATMEM_ENABLE |
| def_bool y |
| |
| 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_DEBUG_PAGEALLOC |
| 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_2GB if 32BIT |
| default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW |
| default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY |
| |
| config MAXPHYSMEM_2GB |
| 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. |
| |
| 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 SECCOMP |
| bool "Enable seccomp to safely compute untrusted bytecode" |
| help |
| This kernel feature is useful for number crunching applications |
| that may need to compute untrusted bytecode during their |
| execution. By using pipes or other transports made available to |
| the process as file descriptors supporting the read/write |
| syscalls, it's possible to isolate those applications in |
| their own address space using seccomp. Once seccomp is |
| enabled via prctl(PR_SET_SECCOMP), it cannot be disabled |
| and the task is only allowed to execute a few safe syscalls |
| defined by each seccomp mode. |
| |
| 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 |
| |
| endmenu |
| |
| config BUILTIN_DTB |
| def_bool n |
| depends on RISCV_M_MODE |
| depends on OF |
| |
| menu "Power management options" |
| |
| source "kernel/power/Kconfig" |
| |
| endmenu |