| blob | 4b12af79321e36f3126b7d123bbb919d3f0b603a |
1 # SPDX-License-Identifier: GPL-2.0-only
2 #
3 # For a description of the syntax of this configuration file,
4 # see Documentation/kbuild/kconfig-language.rst.
5 #
7 config 64BIT
8 bool
10 config 32BIT
11 bool
13 config RISCV
14 def_bool y
15 select ARCH_CLOCKSOURCE_INIT
16 select ARCH_SUPPORTS_ATOMIC_RMW
17 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if MMU
18 select ARCH_STACKWALK
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
25 select ARCH_HAS_KCOV
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_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
34 select ARCH_WANT_FRAME_POINTERS
35 select ARCH_WANT_HUGE_PMD_SHARE if 64BIT
36 select CLONE_BACKWARDS
37 select CLINT_TIMER if !MMU
38 select COMMON_CLK
39 select EDAC_SUPPORT
40 select GENERIC_ARCH_TOPOLOGY if SMP
41 select GENERIC_ATOMIC64 if !64BIT
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
60 select HAVE_ARCH_KGDB
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
74 select HAVE_PCI
75 select HAVE_PERF_EVENTS
76 select HAVE_PERF_REGS
77 select HAVE_PERF_USER_STACK_DUMP
78 select HAVE_STACKPROTECTOR
79 select HAVE_SYSCALL_TRACEPOINTS
80 select IRQ_DOMAIN
81 select MODULES_USE_ELF_RELA if MODULES
82 select MODULE_SECTIONS if MODULES
83 select OF
84 select OF_EARLY_FLATTREE
85 select OF_IRQ
86 select PCI_DOMAINS_GENERIC if PCI
87 select PCI_MSI if PCI
88 select RISCV_INTC
89 select RISCV_TIMER if RISCV_SBI
90 select SPARSEMEM_STATIC if 32BIT
91 select SPARSE_IRQ
92 select SYSCTL_EXCEPTION_TRACE
93 select THREAD_INFO_IN_TASK
94 select UACCESS_MEMCPY if !MMU
95 select HANDLE_DOMAIN_IRQ # FIXME: should go in Kconfigs.soc !!!
97 config ARCH_MMAP_RND_BITS_MIN
98 default 18 if 64BIT
99 default 8
101 # max bits determined by the following formula:
102 # VA_BITS - PAGE_SHIFT - 3
103 config ARCH_MMAP_RND_BITS_MAX
104 default 24 if 64BIT # SV39 based
105 default 17
107 # set if we run in machine mode, cleared if we run in supervisor mode
108 config RISCV_M_MODE
109 bool
110 default !MMU
112 # set if we are running in S-mode and can use SBI calls
113 config RISCV_SBI
114 bool
115 depends on !RISCV_M_MODE
116 default y
118 config MMU
119 bool "MMU-based Paged Memory Management Support"
120 default y
121 help
122 Select if you want MMU-based virtualised addressing space
123 support by paged memory management. If unsure, say 'Y'.
125 config ZONE_DMA32
126 bool
127 default y if 64BIT
129 config VA_BITS
130 int
131 default 32 if 32BIT
132 default 39 if 64BIT
134 config PA_BITS
135 int
136 default 34 if 32BIT
137 default 56 if 64BIT
139 config PAGE_OFFSET
140 hex
141 default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB
142 default 0x80000000 if 64BIT && !MMU
143 default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB
144 default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB
146 config ARCH_FLATMEM_ENABLE
147 def_bool y
149 config ARCH_SPARSEMEM_ENABLE
150 def_bool y
151 depends on MMU
152 select SPARSEMEM_VMEMMAP_ENABLE
154 config ARCH_SELECT_MEMORY_MODEL
155 def_bool ARCH_SPARSEMEM_ENABLE
157 config ARCH_WANT_GENERAL_HUGETLB
158 def_bool y
160 config SYS_SUPPORTS_HUGETLBFS
161 depends on MMU
162 def_bool y
164 config STACKTRACE_SUPPORT
165 def_bool y
167 config TRACE_IRQFLAGS_SUPPORT
168 def_bool y
170 config GENERIC_BUG
171 def_bool y
172 depends on BUG
173 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT
175 config GENERIC_BUG_RELATIVE_POINTERS
176 bool
178 config GENERIC_CALIBRATE_DELAY
179 def_bool y
181 config GENERIC_CSUM
182 def_bool y
184 config GENERIC_HWEIGHT
185 def_bool y
187 config FIX_EARLYCON_MEM
188 def_bool MMU
190 config PGTABLE_LEVELS
191 int
192 default 3 if 64BIT
193 default 2
195 config LOCKDEP_SUPPORT
196 def_bool y
198 source "arch/riscv/Kconfig.socs"
200 menu "Platform type"
202 choice
203 prompt "Base ISA"
204 default ARCH_RV64I
205 help
206 This selects the base ISA that this kernel will target and must match
207 the target platform.
209 config ARCH_RV32I
210 bool "RV32I"
211 select 32BIT
212 select GENERIC_LIB_ASHLDI3
213 select GENERIC_LIB_ASHRDI3
214 select GENERIC_LIB_LSHRDI3
215 select GENERIC_LIB_UCMPDI2
216 select MMU
218 config ARCH_RV64I
219 bool "RV64I"
220 select 64BIT
221 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && GCC_VERSION >= 50000
222 select HAVE_DYNAMIC_FTRACE if MMU
223 select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE
224 select HAVE_FTRACE_MCOUNT_RECORD
225 select HAVE_FUNCTION_GRAPH_TRACER
226 select HAVE_FUNCTION_TRACER
227 select SWIOTLB if MMU
229 endchoice
231 # We must be able to map all physical memory into the kernel, but the compiler
232 # is still a bit more efficient when generating code if it's setup in a manner
233 # such that it can only map 2GiB of memory.
234 choice
235 prompt "Kernel Code Model"
236 default CMODEL_MEDLOW if 32BIT
237 default CMODEL_MEDANY if 64BIT
239 config CMODEL_MEDLOW
240 bool "medium low code model"
241 config CMODEL_MEDANY
242 bool "medium any code model"
243 endchoice
245 config MODULE_SECTIONS
246 bool
247 select HAVE_MOD_ARCH_SPECIFIC
249 choice
250 prompt "Maximum Physical Memory"
251 default MAXPHYSMEM_2GB if 32BIT
252 default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW
253 default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY
255 config MAXPHYSMEM_2GB
256 bool "2GiB"
257 config MAXPHYSMEM_128GB
258 depends on 64BIT && CMODEL_MEDANY
259 bool "128GiB"
260 endchoice
263 config SMP
264 bool "Symmetric Multi-Processing"
265 help
266 This enables support for systems with more than one CPU. If
267 you say N here, the kernel will run on single and
268 multiprocessor machines, but will use only one CPU of a
269 multiprocessor machine. If you say Y here, the kernel will run
270 on many, but not all, single processor machines. On a single
271 processor machine, the kernel will run faster if you say N
272 here.
274 If you don't know what to do here, say N.
276 config NR_CPUS
277 int "Maximum number of CPUs (2-32)"
278 range 2 32
279 depends on SMP
280 default "8"
282 config HOTPLUG_CPU
283 bool "Support for hot-pluggable CPUs"
284 depends on SMP
285 select GENERIC_IRQ_MIGRATION
286 help
288 Say Y here to experiment with turning CPUs off and on. CPUs
289 can be controlled through /sys/devices/system/cpu.
291 Say N if you want to disable CPU hotplug.
293 choice
294 prompt "CPU Tuning"
295 default TUNE_GENERIC
297 config TUNE_GENERIC
298 bool "generic"
300 endchoice
302 config RISCV_ISA_C
303 bool "Emit compressed instructions when building Linux"
304 default y
305 help
306 Adds "C" to the ISA subsets that the toolchain is allowed to emit
307 when building Linux, which results in compressed instructions in the
308 Linux binary.
310 If you don't know what to do here, say Y.
312 menu "supported PMU type"
313 depends on PERF_EVENTS
315 config RISCV_BASE_PMU
316 bool "Base Performance Monitoring Unit"
317 def_bool y
318 help
319 A base PMU that serves as a reference implementation and has limited
320 feature of perf. It can run on any RISC-V machines so serves as the
321 fallback, but this option can also be disable to reduce kernel size.
323 endmenu
325 config FPU
326 bool "FPU support"
327 default y
328 help
329 Say N here if you want to disable all floating-point related procedure
330 in the kernel.
332 If you don't know what to do here, say Y.
334 endmenu
336 menu "Kernel features"
338 source "kernel/Kconfig.hz"
340 config RISCV_SBI_V01
341 bool "SBI v0.1 support"
342 default y
343 depends on RISCV_SBI
344 help
345 This config allows kernel to use SBI v0.1 APIs. This will be
346 deprecated in future once legacy M-mode software are no longer in use.
347 endmenu
349 menu "Boot options"
351 config CMDLINE
352 string "Built-in kernel command line"
353 help
354 For most platforms, the arguments for the kernel's command line
355 are provided at run-time, during boot. However, there are cases
356 where either no arguments are being provided or the provided
357 arguments are insufficient or even invalid.
359 When that occurs, it is possible to define a built-in command
360 line here and choose how the kernel should use it later on.
362 choice
363 prompt "Built-in command line usage" if CMDLINE != ""
364 default CMDLINE_FALLBACK
365 help
366 Choose how the kernel will handle the provided built-in command
367 line.
369 config CMDLINE_FALLBACK
370 bool "Use bootloader kernel arguments if available"
371 help
372 Use the built-in command line as fallback in case we get nothing
373 during boot. This is the default behaviour.
375 config CMDLINE_EXTEND
376 bool "Extend bootloader kernel arguments"
377 help
378 The command-line arguments provided during boot will be
379 appended to the built-in command line. This is useful in
380 cases where the provided arguments are insufficient and
381 you don't want to or cannot modify them.
384 config CMDLINE_FORCE
385 bool "Always use the default kernel command string"
386 help
387 Always use the built-in command line, even if we get one during
388 boot. This is useful in case you need to override the provided
389 command line on systems where you don't have or want control
390 over it.
392 endchoice
394 config EFI_STUB
395 bool
397 config EFI
398 bool "UEFI runtime support"
399 depends on OF
400 select LIBFDT
401 select UCS2_STRING
402 select EFI_PARAMS_FROM_FDT
403 select EFI_STUB
404 select EFI_GENERIC_STUB
405 select EFI_RUNTIME_WRAPPERS
406 select RISCV_ISA_C
407 depends on MMU
408 default y
409 help
410 This option provides support for runtime services provided
411 by UEFI firmware (such as non-volatile variables, realtime
412 clock, and platform reset). A UEFI stub is also provided to
413 allow the kernel to be booted as an EFI application. This
414 is only useful on systems that have UEFI firmware.
416 endmenu
418 config BUILTIN_DTB
419 def_bool n
420 depends on RISCV_M_MODE
421 depends on OF
423 menu "Power management options"
425 source "kernel/power/Kconfig"
427 endmenu
429 source "drivers/firmware/Kconfig"