1 # SPDX-License-Identifier: GPL-2.0-only
3 # For a description of the syntax of this configuration file,
4 # see Documentation/kbuild/kconfig-language.rst.
15 select ARCH_CLOCKSOURCE_INIT
16 select ARCH_SUPPORTS_ATOMIC_RMW
17 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if MMU
18 select ARCH_HAS_BINFMT_FLAT
19 select ARCH_HAS_DEBUG_VM_PGTABLE
20 select ARCH_HAS_DEBUG_VIRTUAL if MMU
21 select ARCH_HAS_DEBUG_WX
22 select ARCH_HAS_GCOV_PROFILE_ALL
23 select ARCH_HAS_GIGANTIC_PAGE
25 select ARCH_HAS_MMIOWB
26 select ARCH_HAS_PTE_SPECIAL
27 select ARCH_HAS_SET_DIRECT_MAP
28 select ARCH_HAS_SET_MEMORY
29 select ARCH_HAS_STRICT_KERNEL_RWX if MMU
30 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
31 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
32 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
33 select ARCH_WANT_FRAME_POINTERS
34 select ARCH_WANT_HUGE_PMD_SHARE if 64BIT
35 select CLONE_BACKWARDS
36 select CLINT_TIMER if !MMU
39 select GENERIC_ARCH_TOPOLOGY if SMP
40 select GENERIC_ATOMIC64 if !64BIT
41 select GENERIC_CLOCKEVENTS
42 select GENERIC_EARLY_IOREMAP
43 select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO
44 select GENERIC_IOREMAP
45 select GENERIC_IRQ_MULTI_HANDLER
46 select GENERIC_IRQ_SHOW
47 select GENERIC_PCI_IOMAP
48 select GENERIC_PTDUMP if MMU
49 select GENERIC_SCHED_CLOCK
50 select GENERIC_SMP_IDLE_THREAD
51 select GENERIC_STRNCPY_FROM_USER if MMU
52 select GENERIC_STRNLEN_USER if MMU
53 select GENERIC_TIME_VSYSCALL if MMU && 64BIT
54 select HANDLE_DOMAIN_IRQ
55 select HAVE_ARCH_AUDITSYSCALL
56 select HAVE_ARCH_JUMP_LABEL
57 select HAVE_ARCH_JUMP_LABEL_RELATIVE
58 select HAVE_ARCH_KASAN if MMU && 64BIT
60 select HAVE_ARCH_KGDB_QXFER_PKT
61 select HAVE_ARCH_MMAP_RND_BITS if MMU
62 select HAVE_ARCH_SECCOMP_FILTER
63 select HAVE_ARCH_TRACEHOOK
64 select HAVE_ASM_MODVERSIONS
65 select HAVE_CONTEXT_TRACKING
66 select HAVE_DEBUG_KMEMLEAK
67 select HAVE_DMA_CONTIGUOUS if MMU
68 select HAVE_EBPF_JIT if MMU
69 select HAVE_FUTEX_CMPXCHG if FUTEX
70 select HAVE_GCC_PLUGINS
71 select HAVE_GENERIC_VDSO if MMU && 64BIT
73 select HAVE_PERF_EVENTS
75 select HAVE_PERF_USER_STACK_DUMP
76 select HAVE_STACKPROTECTOR
77 select HAVE_SYSCALL_TRACEPOINTS
79 select MODULES_USE_ELF_RELA if MODULES
80 select MODULE_SECTIONS if MODULES
82 select OF_EARLY_FLATTREE
84 select PCI_DOMAINS_GENERIC if PCI
87 select RISCV_TIMER if RISCV_SBI
88 select SPARSEMEM_STATIC if 32BIT
90 select SYSCTL_EXCEPTION_TRACE
91 select THREAD_INFO_IN_TASK
92 select UACCESS_MEMCPY if !MMU
94 config ARCH_MMAP_RND_BITS_MIN
98 # max bits determined by the following formula:
99 # VA_BITS - PAGE_SHIFT - 3
100 config ARCH_MMAP_RND_BITS_MAX
101 default 24 if 64BIT # SV39 based
104 # set if we run in machine mode, cleared if we run in supervisor mode
109 # set if we are running in S-mode and can use SBI calls
112 depends on !RISCV_M_MODE
116 bool "MMU-based Paged Memory Management Support"
119 Select if you want MMU-based virtualised addressing space
120 support by paged memory management. If unsure, say 'Y'.
138 default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB
139 default 0x80000000 if 64BIT && !MMU
140 default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB
141 default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB
143 config ARCH_FLATMEM_ENABLE
146 config ARCH_SPARSEMEM_ENABLE
149 select SPARSEMEM_VMEMMAP_ENABLE
151 config ARCH_SELECT_MEMORY_MODEL
152 def_bool ARCH_SPARSEMEM_ENABLE
154 config ARCH_WANT_GENERAL_HUGETLB
157 config SYS_SUPPORTS_HUGETLBFS
161 config STACKTRACE_SUPPORT
164 config TRACE_IRQFLAGS_SUPPORT
170 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT
172 config GENERIC_BUG_RELATIVE_POINTERS
175 config GENERIC_CALIBRATE_DELAY
181 config GENERIC_HWEIGHT
184 config FIX_EARLYCON_MEM
187 config PGTABLE_LEVELS
192 config LOCKDEP_SUPPORT
195 source "arch/riscv/Kconfig.socs"
203 This selects the base ISA that this kernel will target and must match
209 select GENERIC_LIB_ASHLDI3
210 select GENERIC_LIB_ASHRDI3
211 select GENERIC_LIB_LSHRDI3
212 select GENERIC_LIB_UCMPDI2
218 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && GCC_VERSION >= 50000
219 select HAVE_DYNAMIC_FTRACE if MMU
220 select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE
221 select HAVE_FTRACE_MCOUNT_RECORD
222 select HAVE_FUNCTION_GRAPH_TRACER
223 select HAVE_FUNCTION_TRACER
224 select SWIOTLB if MMU
228 # We must be able to map all physical memory into the kernel, but the compiler
229 # is still a bit more efficient when generating code if it's setup in a manner
230 # such that it can only map 2GiB of memory.
232 prompt "Kernel Code Model"
233 default CMODEL_MEDLOW if 32BIT
234 default CMODEL_MEDANY if 64BIT
237 bool "medium low code model"
239 bool "medium any code model"
242 config MODULE_SECTIONS
244 select HAVE_MOD_ARCH_SPECIFIC
247 prompt "Maximum Physical Memory"
248 default MAXPHYSMEM_2GB if 32BIT
249 default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW
250 default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY
252 config MAXPHYSMEM_2GB
254 config MAXPHYSMEM_128GB
255 depends on 64BIT && CMODEL_MEDANY
261 bool "Symmetric Multi-Processing"
263 This enables support for systems with more than one CPU. If
264 you say N here, the kernel will run on single and
265 multiprocessor machines, but will use only one CPU of a
266 multiprocessor machine. If you say Y here, the kernel will run
267 on many, but not all, single processor machines. On a single
268 processor machine, the kernel will run faster if you say N
271 If you don't know what to do here, say N.
274 int "Maximum number of CPUs (2-32)"
280 bool "Support for hot-pluggable CPUs"
282 select GENERIC_IRQ_MIGRATION
285 Say Y here to experiment with turning CPUs off and on. CPUs
286 can be controlled through /sys/devices/system/cpu.
288 Say N if you want to disable CPU hotplug.
300 bool "Emit compressed instructions when building Linux"
303 Adds "C" to the ISA subsets that the toolchain is allowed to emit
304 when building Linux, which results in compressed instructions in the
307 If you don't know what to do here, say Y.
309 menu "supported PMU type"
310 depends on PERF_EVENTS
312 config RISCV_BASE_PMU
313 bool "Base Performance Monitoring Unit"
316 A base PMU that serves as a reference implementation and has limited
317 feature of perf. It can run on any RISC-V machines so serves as the
318 fallback, but this option can also be disable to reduce kernel size.
326 Say N here if you want to disable all floating-point related procedure
329 If you don't know what to do here, say Y.
333 menu "Kernel features"
335 source "kernel/Kconfig.hz"
338 bool "SBI v0.1 support"
342 This config allows kernel to use SBI v0.1 APIs. This will be
343 deprecated in future once legacy M-mode software are no longer in use.
349 string "Built-in kernel command line"
351 For most platforms, the arguments for the kernel's command line
352 are provided at run-time, during boot. However, there are cases
353 where either no arguments are being provided or the provided
354 arguments are insufficient or even invalid.
356 When that occurs, it is possible to define a built-in command
357 line here and choose how the kernel should use it later on.
360 prompt "Built-in command line usage" if CMDLINE != ""
361 default CMDLINE_FALLBACK
363 Choose how the kernel will handle the provided built-in command
366 config CMDLINE_FALLBACK
367 bool "Use bootloader kernel arguments if available"
369 Use the built-in command line as fallback in case we get nothing
370 during boot. This is the default behaviour.
372 config CMDLINE_EXTEND
373 bool "Extend bootloader kernel arguments"
375 The command-line arguments provided during boot will be
376 appended to the built-in command line. This is useful in
377 cases where the provided arguments are insufficient and
378 you don't want to or cannot modify them.
382 bool "Always use the default kernel command string"
384 Always use the built-in command line, even if we get one during
385 boot. This is useful in case you need to override the provided
386 command line on systems where you don't have or want control
395 bool "UEFI runtime support"
399 select EFI_PARAMS_FROM_FDT
401 select EFI_GENERIC_STUB
402 select EFI_RUNTIME_WRAPPERS
407 This option provides support for runtime services provided
408 by UEFI firmware (such as non-volatile variables, realtime
409 clock, and platform reset). A UEFI stub is also provided to
410 allow the kernel to be booted as an EFI application. This
411 is only useful on systems that have UEFI firmware.
417 depends on RISCV_M_MODE
420 menu "Power management options"
422 source "kernel/power/Kconfig"
426 source "drivers/firmware/Kconfig"