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
19 select ARCH_HAS_BINFMT_FLAT
20 select ARCH_HAS_DEBUG_VM_PGTABLE
21 select ARCH_HAS_DEBUG_VIRTUAL if MMU
22 select ARCH_HAS_DEBUG_WX
23 select ARCH_HAS_GCOV_PROFILE_ALL
24 select ARCH_HAS_GIGANTIC_PAGE
26 select ARCH_HAS_MMIOWB
27 select ARCH_HAS_PTE_SPECIAL
28 select ARCH_HAS_SET_DIRECT_MAP
29 select ARCH_HAS_SET_MEMORY
30 select ARCH_HAS_STRICT_KERNEL_RWX if MMU
31 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
32 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
33 select ARCH_SUPPORTS_HUGETLBFS if MMU
34 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
35 select ARCH_WANT_FRAME_POINTERS
36 select ARCH_WANT_HUGE_PMD_SHARE if 64BIT
37 select BINFMT_FLAT_NO_DATA_START_OFFSET if !MMU
38 select CLONE_BACKWARDS
39 select CLINT_TIMER if !MMU
42 select GENERIC_ARCH_TOPOLOGY if SMP
43 select GENERIC_ATOMIC64 if !64BIT
44 select GENERIC_EARLY_IOREMAP
45 select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO
46 select GENERIC_IOREMAP
47 select GENERIC_IRQ_MULTI_HANDLER
48 select GENERIC_IRQ_SHOW
49 select GENERIC_LIB_DEVMEM_IS_ALLOWED
50 select GENERIC_PCI_IOMAP
51 select GENERIC_PTDUMP if MMU
52 select GENERIC_SCHED_CLOCK
53 select GENERIC_SMP_IDLE_THREAD
54 select GENERIC_STRNCPY_FROM_USER if MMU
55 select GENERIC_STRNLEN_USER if MMU
56 select GENERIC_TIME_VSYSCALL if MMU && 64BIT
57 select HANDLE_DOMAIN_IRQ
58 select HAVE_ARCH_AUDITSYSCALL
59 select HAVE_ARCH_JUMP_LABEL
60 select HAVE_ARCH_JUMP_LABEL_RELATIVE
61 select HAVE_ARCH_KASAN if MMU && 64BIT
62 select HAVE_ARCH_KASAN_VMALLOC if MMU && 64BIT
64 select HAVE_ARCH_KGDB_QXFER_PKT
65 select HAVE_ARCH_MMAP_RND_BITS if MMU
66 select HAVE_ARCH_SECCOMP_FILTER
67 select HAVE_ARCH_TRACEHOOK
68 select HAVE_ASM_MODVERSIONS
69 select HAVE_CONTEXT_TRACKING
70 select HAVE_DEBUG_KMEMLEAK
71 select HAVE_DMA_CONTIGUOUS if MMU
72 select HAVE_EBPF_JIT if MMU
73 select HAVE_FUNCTION_ERROR_INJECTION
74 select HAVE_FUTEX_CMPXCHG if FUTEX
75 select HAVE_GCC_PLUGINS
76 select HAVE_GENERIC_VDSO if MMU && 64BIT
77 select HAVE_IRQ_TIME_ACCOUNTING
79 select HAVE_KPROBES_ON_FTRACE
80 select HAVE_KRETPROBES
82 select HAVE_PERF_EVENTS
84 select HAVE_PERF_USER_STACK_DUMP
85 select HAVE_REGS_AND_STACK_ACCESS_API
86 select HAVE_STACKPROTECTOR
87 select HAVE_SYSCALL_TRACEPOINTS
89 select MODULES_USE_ELF_RELA if MODULES
90 select MODULE_SECTIONS if MODULES
92 select OF_EARLY_FLATTREE
94 select PCI_DOMAINS_GENERIC if PCI
97 select RISCV_TIMER if RISCV_SBI
99 select SYSCTL_EXCEPTION_TRACE
100 select THREAD_INFO_IN_TASK
101 select UACCESS_MEMCPY if !MMU
103 config ARCH_MMAP_RND_BITS_MIN
107 # max bits determined by the following formula:
108 # VA_BITS - PAGE_SHIFT - 3
109 config ARCH_MMAP_RND_BITS_MAX
110 default 24 if 64BIT # SV39 based
113 # set if we run in machine mode, cleared if we run in supervisor mode
118 # set if we are running in S-mode and can use SBI calls
121 depends on !RISCV_M_MODE
125 bool "MMU-based Paged Memory Management Support"
128 Select if you want MMU-based virtualised addressing space
129 support by paged memory management. If unsure, say 'Y'.
147 default 0xC0000000 if 32BIT && MAXPHYSMEM_1GB
148 default 0x80000000 if 64BIT && !MMU
149 default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB
150 default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB
152 config ARCH_FLATMEM_ENABLE
155 config ARCH_SPARSEMEM_ENABLE
158 select SPARSEMEM_STATIC if 32BIT && SPARSEMEM
159 select SPARSEMEM_VMEMMAP_ENABLE if 64BIT
161 config ARCH_SELECT_MEMORY_MODEL
162 def_bool ARCH_SPARSEMEM_ENABLE
164 config ARCH_WANT_GENERAL_HUGETLB
167 config ARCH_SUPPORTS_UPROBES
170 config STACKTRACE_SUPPORT
173 config TRACE_IRQFLAGS_SUPPORT
179 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT
181 config GENERIC_BUG_RELATIVE_POINTERS
184 config GENERIC_CALIBRATE_DELAY
190 config GENERIC_HWEIGHT
193 config FIX_EARLYCON_MEM
196 config PGTABLE_LEVELS
201 config LOCKDEP_SUPPORT
204 source "arch/riscv/Kconfig.socs"
212 This selects the base ISA that this kernel will target and must match
218 select GENERIC_LIB_ASHLDI3
219 select GENERIC_LIB_ASHRDI3
220 select GENERIC_LIB_LSHRDI3
221 select GENERIC_LIB_UCMPDI2
227 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && GCC_VERSION >= 50000
228 select HAVE_DYNAMIC_FTRACE if MMU
229 select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE
230 select HAVE_FTRACE_MCOUNT_RECORD
231 select HAVE_FUNCTION_GRAPH_TRACER
232 select HAVE_FUNCTION_TRACER
233 select SWIOTLB if MMU
237 # We must be able to map all physical memory into the kernel, but the compiler
238 # is still a bit more efficient when generating code if it's setup in a manner
239 # such that it can only map 2GiB of memory.
241 prompt "Kernel Code Model"
242 default CMODEL_MEDLOW if 32BIT
243 default CMODEL_MEDANY if 64BIT
246 bool "medium low code model"
248 bool "medium any code model"
251 config MODULE_SECTIONS
253 select HAVE_MOD_ARCH_SPECIFIC
256 prompt "Maximum Physical Memory"
257 default MAXPHYSMEM_1GB if 32BIT
258 default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW
259 default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY
261 config MAXPHYSMEM_1GB
264 config MAXPHYSMEM_2GB
265 depends on 64BIT && CMODEL_MEDLOW
267 config MAXPHYSMEM_128GB
268 depends on 64BIT && CMODEL_MEDANY
274 bool "Symmetric Multi-Processing"
276 This enables support for systems with more than one CPU. If
277 you say N here, the kernel will run on single and
278 multiprocessor machines, but will use only one CPU of a
279 multiprocessor machine. If you say Y here, the kernel will run
280 on many, but not all, single processor machines. On a single
281 processor machine, the kernel will run faster if you say N
284 If you don't know what to do here, say N.
287 int "Maximum number of CPUs (2-32)"
293 bool "Support for hot-pluggable CPUs"
295 select GENERIC_IRQ_MIGRATION
298 Say Y here to experiment with turning CPUs off and on. CPUs
299 can be controlled through /sys/devices/system/cpu.
301 Say N if you want to disable CPU hotplug.
312 # Common NUMA Features
314 bool "NUMA Memory Allocation and Scheduler Support"
315 depends on SMP && MMU
316 select GENERIC_ARCH_NUMA
318 select ARCH_SUPPORTS_NUMA_BALANCING
320 Enable NUMA (Non-Uniform Memory Access) support.
322 The kernel will try to allocate memory used by a CPU on the
323 local memory of the CPU and add some more NUMA awareness to the kernel.
326 int "Maximum NUMA Nodes (as a power of 2)"
329 depends on NEED_MULTIPLE_NODES
331 Specify the maximum number of NUMA Nodes available on the target
332 system. Increases memory reserved to accommodate various tables.
334 config USE_PERCPU_NUMA_NODE_ID
338 config NEED_PER_CPU_EMBED_FIRST_CHUNK
343 bool "Emit compressed instructions when building Linux"
346 Adds "C" to the ISA subsets that the toolchain is allowed to emit
347 when building Linux, which results in compressed instructions in the
350 If you don't know what to do here, say Y.
352 menu "supported PMU type"
353 depends on PERF_EVENTS
355 config RISCV_BASE_PMU
356 bool "Base Performance Monitoring Unit"
359 A base PMU that serves as a reference implementation and has limited
360 feature of perf. It can run on any RISC-V machines so serves as the
361 fallback, but this option can also be disable to reduce kernel size.
369 Say N here if you want to disable all floating-point related procedure
372 If you don't know what to do here, say Y.
376 menu "Kernel features"
378 source "kernel/Kconfig.hz"
381 bool "SBI v0.1 support"
385 This config allows kernel to use SBI v0.1 APIs. This will be
386 deprecated in future once legacy M-mode software are no longer in use.
392 string "Built-in kernel command line"
394 For most platforms, the arguments for the kernel's command line
395 are provided at run-time, during boot. However, there are cases
396 where either no arguments are being provided or the provided
397 arguments are insufficient or even invalid.
399 When that occurs, it is possible to define a built-in command
400 line here and choose how the kernel should use it later on.
403 prompt "Built-in command line usage" if CMDLINE != ""
404 default CMDLINE_FALLBACK
406 Choose how the kernel will handle the provided built-in command
409 config CMDLINE_FALLBACK
410 bool "Use bootloader kernel arguments if available"
412 Use the built-in command line as fallback in case we get nothing
413 during boot. This is the default behaviour.
415 config CMDLINE_EXTEND
416 bool "Extend bootloader kernel arguments"
418 The command-line arguments provided during boot will be
419 appended to the built-in command line. This is useful in
420 cases where the provided arguments are insufficient and
421 you don't want to or cannot modify them.
425 bool "Always use the default kernel command string"
427 Always use the built-in command line, even if we get one during
428 boot. This is useful in case you need to override the provided
429 command line on systems where you don't have or want control
438 bool "UEFI runtime support"
442 select EFI_PARAMS_FROM_FDT
444 select EFI_GENERIC_STUB
445 select EFI_RUNTIME_WRAPPERS
450 This option provides support for runtime services provided
451 by UEFI firmware (such as non-volatile variables, realtime
452 clock, and platform reset). A UEFI stub is also provided to
453 allow the kernel to be booted as an EFI application. This
454 is only useful on systems that have UEFI firmware.
456 config CC_HAVE_STACKPROTECTOR_TLS
457 def_bool $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=tp -mstack-protector-guard-offset=0)
459 config STACKPROTECTOR_PER_TASK
461 depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS
469 menu "Power management options"
471 source "kernel/power/Kconfig"
475 source "drivers/firmware/Kconfig"