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_HAS_BINFMT_FLAT
18 select ARCH_HAS_DEBUG_VM_PGTABLE
19 select ARCH_HAS_DEBUG_VIRTUAL if MMU
20 select ARCH_HAS_DEBUG_WX
21 select ARCH_HAS_GCOV_PROFILE_ALL
22 select ARCH_HAS_GIGANTIC_PAGE
24 select ARCH_HAS_MMIOWB
25 select ARCH_HAS_PTE_SPECIAL
26 select ARCH_HAS_SET_DIRECT_MAP
27 select ARCH_HAS_SET_MEMORY
28 select ARCH_HAS_STRICT_KERNEL_RWX if MMU
29 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
30 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
31 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
32 select ARCH_WANT_FRAME_POINTERS
33 select ARCH_WANT_HUGE_PMD_SHARE if 64BIT
34 select CLONE_BACKWARDS
35 select CLINT_TIMER if !MMU
38 select GENERIC_ARCH_TOPOLOGY if SMP
39 select GENERIC_ATOMIC64 if !64BIT
40 select GENERIC_CLOCKEVENTS
41 select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO
42 select GENERIC_IOREMAP
43 select GENERIC_IRQ_MULTI_HANDLER
44 select GENERIC_IRQ_SHOW
45 select GENERIC_PCI_IOMAP
46 select GENERIC_PTDUMP if MMU
47 select GENERIC_SCHED_CLOCK
48 select GENERIC_SMP_IDLE_THREAD
49 select GENERIC_STRNCPY_FROM_USER if MMU
50 select GENERIC_STRNLEN_USER if MMU
51 select GENERIC_TIME_VSYSCALL if MMU && 64BIT
52 select HANDLE_DOMAIN_IRQ
53 select HAVE_ARCH_AUDITSYSCALL
54 select HAVE_ARCH_JUMP_LABEL
55 select HAVE_ARCH_JUMP_LABEL_RELATIVE
56 select HAVE_ARCH_KASAN if MMU && 64BIT
58 select HAVE_ARCH_KGDB_QXFER_PKT
59 select HAVE_ARCH_MMAP_RND_BITS if MMU
60 select HAVE_ARCH_SECCOMP_FILTER
61 select HAVE_ARCH_TRACEHOOK
62 select HAVE_ASM_MODVERSIONS
63 select HAVE_CONTEXT_TRACKING
64 select HAVE_DEBUG_KMEMLEAK
65 select HAVE_DMA_CONTIGUOUS if MMU
66 select HAVE_EBPF_JIT if MMU
67 select HAVE_FUTEX_CMPXCHG if FUTEX
68 select HAVE_GCC_PLUGINS
69 select HAVE_GENERIC_VDSO if MMU && 64BIT
71 select HAVE_PERF_EVENTS
73 select HAVE_PERF_USER_STACK_DUMP
74 select HAVE_STACKPROTECTOR
75 select HAVE_SYSCALL_TRACEPOINTS
77 select MODULES_USE_ELF_RELA if MODULES
78 select MODULE_SECTIONS if MODULES
80 select OF_EARLY_FLATTREE
82 select PCI_DOMAINS_GENERIC if PCI
85 select RISCV_TIMER if RISCV_SBI
86 select SPARSEMEM_STATIC if 32BIT
88 select SYSCTL_EXCEPTION_TRACE
89 select THREAD_INFO_IN_TASK
91 config ARCH_MMAP_RND_BITS_MIN
95 # max bits determined by the following formula:
96 # VA_BITS - PAGE_SHIFT - 3
97 config ARCH_MMAP_RND_BITS_MAX
98 default 24 if 64BIT # SV39 based
101 # set if we run in machine mode, cleared if we run in supervisor mode
106 # set if we are running in S-mode and can use SBI calls
109 depends on !RISCV_M_MODE
113 bool "MMU-based Paged Memory Management Support"
116 Select if you want MMU-based virtualised addressing space
117 support by paged memory management. If unsure, say 'Y'.
135 default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB
136 default 0x80000000 if 64BIT && !MMU
137 default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB
138 default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB
140 config ARCH_FLATMEM_ENABLE
143 config ARCH_SPARSEMEM_ENABLE
146 select SPARSEMEM_VMEMMAP_ENABLE
148 config ARCH_SELECT_MEMORY_MODEL
149 def_bool ARCH_SPARSEMEM_ENABLE
151 config ARCH_WANT_GENERAL_HUGETLB
154 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
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 "Enable seccomp to safely compute untrusted bytecode"
340 This kernel feature is useful for number crunching applications
341 that may need to compute untrusted bytecode during their
342 execution. By using pipes or other transports made available to
343 the process as file descriptors supporting the read/write
344 syscalls, it's possible to isolate those applications in
345 their own address space using seccomp. Once seccomp is
346 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
347 and the task is only allowed to execute a few safe syscalls
348 defined by each seccomp mode.
351 bool "SBI v0.1 support"
355 This config allows kernel to use SBI v0.1 APIs. This will be
356 deprecated in future once legacy M-mode software are no longer in use.
362 string "Built-in kernel command line"
364 For most platforms, the arguments for the kernel's command line
365 are provided at run-time, during boot. However, there are cases
366 where either no arguments are being provided or the provided
367 arguments are insufficient or even invalid.
369 When that occurs, it is possible to define a built-in command
370 line here and choose how the kernel should use it later on.
373 prompt "Built-in command line usage" if CMDLINE != ""
374 default CMDLINE_FALLBACK
376 Choose how the kernel will handle the provided built-in command
379 config CMDLINE_FALLBACK
380 bool "Use bootloader kernel arguments if available"
382 Use the built-in command line as fallback in case we get nothing
383 during boot. This is the default behaviour.
385 config CMDLINE_EXTEND
386 bool "Extend bootloader kernel arguments"
388 The command-line arguments provided during boot will be
389 appended to the built-in command line. This is useful in
390 cases where the provided arguments are insufficient and
391 you don't want to or cannot modify them.
395 bool "Always use the default kernel command string"
397 Always use the built-in command line, even if we get one during
398 boot. This is useful in case you need to override the provided
399 command line on systems where you don't have or want control
408 depends on RISCV_M_MODE
411 menu "Power management options"
413 source "kernel/power/Kconfig"