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
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_LIB_DEVMEM_IS_ALLOWED
48 select GENERIC_PCI_IOMAP
49 select GENERIC_PTDUMP if MMU
50 select GENERIC_SCHED_CLOCK
51 select GENERIC_SMP_IDLE_THREAD
52 select GENERIC_STRNCPY_FROM_USER if MMU
53 select GENERIC_STRNLEN_USER if MMU
54 select GENERIC_TIME_VSYSCALL if MMU && 64BIT
55 select HANDLE_DOMAIN_IRQ
56 select HAVE_ARCH_AUDITSYSCALL
57 select HAVE_ARCH_JUMP_LABEL
58 select HAVE_ARCH_JUMP_LABEL_RELATIVE
59 select HAVE_ARCH_KASAN if MMU && 64BIT
61 select HAVE_ARCH_KGDB_QXFER_PKT
62 select HAVE_ARCH_MMAP_RND_BITS if MMU
63 select HAVE_ARCH_SECCOMP_FILTER
64 select HAVE_ARCH_TRACEHOOK
65 select HAVE_ASM_MODVERSIONS
66 select HAVE_CONTEXT_TRACKING
67 select HAVE_DEBUG_KMEMLEAK
68 select HAVE_DMA_CONTIGUOUS if MMU
69 select HAVE_EBPF_JIT if MMU
70 select HAVE_FUTEX_CMPXCHG if FUTEX
71 select HAVE_GCC_PLUGINS
72 select HAVE_GENERIC_VDSO if MMU && 64BIT
73 select HAVE_IRQ_TIME_ACCOUNTING
75 select HAVE_PERF_EVENTS
77 select HAVE_PERF_USER_STACK_DUMP
78 select HAVE_STACKPROTECTOR
79 select HAVE_SYSCALL_TRACEPOINTS
81 select MODULES_USE_ELF_RELA if MODULES
82 select MODULE_SECTIONS if MODULES
84 select OF_EARLY_FLATTREE
86 select PCI_DOMAINS_GENERIC if PCI
89 select RISCV_TIMER if RISCV_SBI
90 select SPARSEMEM_STATIC if 32BIT
92 select SYSCTL_EXCEPTION_TRACE
93 select THREAD_INFO_IN_TASK
94 select UACCESS_MEMCPY if !MMU
96 config ARCH_MMAP_RND_BITS_MIN
100 # max bits determined by the following formula:
101 # VA_BITS - PAGE_SHIFT - 3
102 config ARCH_MMAP_RND_BITS_MAX
103 default 24 if 64BIT # SV39 based
106 # set if we run in machine mode, cleared if we run in supervisor mode
111 # set if we are running in S-mode and can use SBI calls
114 depends on !RISCV_M_MODE
118 bool "MMU-based Paged Memory Management Support"
121 Select if you want MMU-based virtualised addressing space
122 support by paged memory management. If unsure, say 'Y'.
140 default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB
141 default 0x80000000 if 64BIT && !MMU
142 default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB
143 default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB
145 config ARCH_FLATMEM_ENABLE
148 config ARCH_SPARSEMEM_ENABLE
151 select SPARSEMEM_VMEMMAP_ENABLE
153 config ARCH_SELECT_MEMORY_MODEL
154 def_bool ARCH_SPARSEMEM_ENABLE
156 config ARCH_WANT_GENERAL_HUGETLB
159 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
162 config SYS_SUPPORTS_HUGETLBFS
166 config STACKTRACE_SUPPORT
169 config TRACE_IRQFLAGS_SUPPORT
175 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT
177 config GENERIC_BUG_RELATIVE_POINTERS
180 config GENERIC_CALIBRATE_DELAY
186 config GENERIC_HWEIGHT
189 config FIX_EARLYCON_MEM
192 config PGTABLE_LEVELS
197 config LOCKDEP_SUPPORT
200 source "arch/riscv/Kconfig.socs"
208 This selects the base ISA that this kernel will target and must match
214 select GENERIC_LIB_ASHLDI3
215 select GENERIC_LIB_ASHRDI3
216 select GENERIC_LIB_LSHRDI3
217 select GENERIC_LIB_UCMPDI2
223 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && GCC_VERSION >= 50000
224 select HAVE_DYNAMIC_FTRACE if MMU
225 select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE
226 select HAVE_FTRACE_MCOUNT_RECORD
227 select HAVE_FUNCTION_GRAPH_TRACER
228 select HAVE_FUNCTION_TRACER
229 select SWIOTLB if MMU
233 # We must be able to map all physical memory into the kernel, but the compiler
234 # is still a bit more efficient when generating code if it's setup in a manner
235 # such that it can only map 2GiB of memory.
237 prompt "Kernel Code Model"
238 default CMODEL_MEDLOW if 32BIT
239 default CMODEL_MEDANY if 64BIT
242 bool "medium low code model"
244 bool "medium any code model"
247 config MODULE_SECTIONS
249 select HAVE_MOD_ARCH_SPECIFIC
252 prompt "Maximum Physical Memory"
253 default MAXPHYSMEM_2GB if 32BIT
254 default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW
255 default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY
257 config MAXPHYSMEM_2GB
259 config MAXPHYSMEM_128GB
260 depends on 64BIT && CMODEL_MEDANY
266 bool "Symmetric Multi-Processing"
268 This enables support for systems with more than one CPU. If
269 you say N here, the kernel will run on single and
270 multiprocessor machines, but will use only one CPU of a
271 multiprocessor machine. If you say Y here, the kernel will run
272 on many, but not all, single processor machines. On a single
273 processor machine, the kernel will run faster if you say N
276 If you don't know what to do here, say N.
279 int "Maximum number of CPUs (2-32)"
285 bool "Support for hot-pluggable CPUs"
287 select GENERIC_IRQ_MIGRATION
290 Say Y here to experiment with turning CPUs off and on. CPUs
291 can be controlled through /sys/devices/system/cpu.
293 Say N if you want to disable CPU hotplug.
305 bool "Emit compressed instructions when building Linux"
308 Adds "C" to the ISA subsets that the toolchain is allowed to emit
309 when building Linux, which results in compressed instructions in the
312 If you don't know what to do here, say Y.
314 menu "supported PMU type"
315 depends on PERF_EVENTS
317 config RISCV_BASE_PMU
318 bool "Base Performance Monitoring Unit"
321 A base PMU that serves as a reference implementation and has limited
322 feature of perf. It can run on any RISC-V machines so serves as the
323 fallback, but this option can also be disable to reduce kernel size.
331 Say N here if you want to disable all floating-point related procedure
334 If you don't know what to do here, say Y.
338 menu "Kernel features"
340 source "kernel/Kconfig.hz"
343 bool "SBI v0.1 support"
347 This config allows kernel to use SBI v0.1 APIs. This will be
348 deprecated in future once legacy M-mode software are no longer in use.
354 string "Built-in kernel command line"
356 For most platforms, the arguments for the kernel's command line
357 are provided at run-time, during boot. However, there are cases
358 where either no arguments are being provided or the provided
359 arguments are insufficient or even invalid.
361 When that occurs, it is possible to define a built-in command
362 line here and choose how the kernel should use it later on.
365 prompt "Built-in command line usage" if CMDLINE != ""
366 default CMDLINE_FALLBACK
368 Choose how the kernel will handle the provided built-in command
371 config CMDLINE_FALLBACK
372 bool "Use bootloader kernel arguments if available"
374 Use the built-in command line as fallback in case we get nothing
375 during boot. This is the default behaviour.
377 config CMDLINE_EXTEND
378 bool "Extend bootloader kernel arguments"
380 The command-line arguments provided during boot will be
381 appended to the built-in command line. This is useful in
382 cases where the provided arguments are insufficient and
383 you don't want to or cannot modify them.
387 bool "Always use the default kernel command string"
389 Always use the built-in command line, even if we get one during
390 boot. This is useful in case you need to override the provided
391 command line on systems where you don't have or want control
400 bool "UEFI runtime support"
404 select EFI_PARAMS_FROM_FDT
406 select EFI_GENERIC_STUB
407 select EFI_RUNTIME_WRAPPERS
412 This option provides support for runtime services provided
413 by UEFI firmware (such as non-volatile variables, realtime
414 clock, and platform reset). A UEFI stub is also provided to
415 allow the kernel to be booted as an EFI application. This
416 is only useful on systems that have UEFI firmware.
422 depends on RISCV_M_MODE
425 menu "Power management options"
427 source "kernel/power/Kconfig"
431 source "drivers/firmware/Kconfig"