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ec8f24b7 | 1 | # SPDX-License-Identifier: GPL-2.0-only |
fbe934d6 PD |
2 | # |
3 | # For a description of the syntax of this configuration file, | |
cd238eff | 4 | # see Documentation/kbuild/kconfig-language.rst. |
fbe934d6 PD |
5 | # |
6 | ||
c3e4ed01 CH |
7 | config 64BIT |
8 | bool | |
9 | ||
10 | config 32BIT | |
11 | bool | |
12 | ||
fbe934d6 PD |
13 | config RISCV |
14 | def_bool y | |
15 | select OF | |
16 | select OF_EARLY_FLATTREE | |
17 | select OF_IRQ | |
ad97f9df | 18 | select ARCH_HAS_BINFMT_FLAT |
fbe934d6 PD |
19 | select ARCH_WANT_FRAME_POINTERS |
20 | select CLONE_BACKWARDS | |
21 | select COMMON_CLK | |
22 | select GENERIC_CLOCKEVENTS | |
23 | select GENERIC_CPU_DEVICES | |
24 | select GENERIC_IRQ_SHOW | |
25 | select GENERIC_PCI_IOMAP | |
9b9afe4a | 26 | select GENERIC_SCHED_CLOCK |
6bd33e1e CH |
27 | select GENERIC_STRNCPY_FROM_USER if MMU |
28 | select GENERIC_STRNLEN_USER if MMU | |
fbe934d6 | 29 | select GENERIC_SMP_IDLE_THREAD |
09afac77 | 30 | select GENERIC_ATOMIC64 if !64BIT |
38af5782 | 31 | select GENERIC_IOREMAP |
efe75c49 | 32 | select HAVE_ARCH_AUDITSYSCALL |
5340627e | 33 | select HAVE_ARCH_SECCOMP_FILTER |
2ff2b7ec | 34 | select HAVE_ASM_MODVERSIONS |
5ec9c4ff | 35 | select HAVE_MEMBLOCK_NODE_MAP |
6bd33e1e | 36 | select HAVE_DMA_CONTIGUOUS if MMU |
b90edb33 | 37 | select HAVE_FUTEX_CMPXCHG if FUTEX |
178e9fc4 | 38 | select HAVE_PERF_EVENTS |
98a93b0b MH |
39 | select HAVE_PERF_REGS |
40 | select HAVE_PERF_USER_STACK_DUMP | |
5aeb1b36 | 41 | select HAVE_SYSCALL_TRACEPOINTS |
fbe934d6 | 42 | select IRQ_DOMAIN |
fbe934d6 PD |
43 | select SPARSE_IRQ |
44 | select SYSCTL_EXCEPTION_TRACE | |
45 | select HAVE_ARCH_TRACEHOOK | |
eb01d42a | 46 | select HAVE_PCI |
fbe934d6 | 47 | select MODULES_USE_ELF_RELA if MODULES |
2cffc956 | 48 | select MODULE_SECTIONS if MODULES |
fbe934d6 | 49 | select THREAD_INFO_IN_TASK |
2eac9c2d | 50 | select PCI_DOMAINS_GENERIC if PCI |
eb01d42a | 51 | select PCI_MSI if PCI |
fbe934d6 | 52 | select RISCV_TIMER |
6bd33e1e | 53 | select UACCESS_MEMCPY if !MMU |
cc6c9848 | 54 | select GENERIC_IRQ_MULTI_HANDLER |
03f11f03 | 55 | select GENERIC_ARCH_TOPOLOGY if SMP |
3010a5ea | 56 | select ARCH_HAS_PTE_SPECIAL |
b012980d | 57 | select ARCH_HAS_MMIOWB |
6435f773 | 58 | select ARCH_HAS_DEBUG_VIRTUAL |
2353ecc6 | 59 | select HAVE_EBPF_JIT if 64BIT |
91abaeaa | 60 | select EDAC_SUPPORT |
9e953cda AG |
61 | select ARCH_HAS_GIGANTIC_PAGE |
62 | select ARCH_WANT_HUGE_PMD_SHARE if 64BIT | |
d95f1a54 | 63 | select SPARSEMEM_STATIC if 32BIT |
54c95a11 | 64 | select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU |
6bd33e1e | 65 | select HAVE_ARCH_MMAP_RND_BITS if MMU |
0da310e8 | 66 | select ARCH_HAS_GCOV_PROFILE_ALL |
20bda4ed | 67 | select HAVE_COPY_THREAD_TLS |
8ad8b727 | 68 | select HAVE_ARCH_KASAN if MMU && 64BIT |
54c95a11 AG |
69 | |
70 | config ARCH_MMAP_RND_BITS_MIN | |
71 | default 18 if 64BIT | |
72 | default 8 | |
73 | ||
74 | # max bits determined by the following formula: | |
75 | # VA_BITS - PAGE_SHIFT - 3 | |
76 | config ARCH_MMAP_RND_BITS_MAX | |
77 | default 24 if 64BIT # SV39 based | |
78 | default 17 | |
fbe934d6 | 79 | |
a4c3733d CH |
80 | # set if we run in machine mode, cleared if we run in supervisor mode |
81 | config RISCV_M_MODE | |
82 | bool | |
6bd33e1e | 83 | default !MMU |
a4c3733d | 84 | |
eded8bc6 DLM |
85 | # set if we are running in S-mode and can use SBI calls |
86 | config RISCV_SBI | |
87 | bool | |
88 | depends on !RISCV_M_MODE | |
89 | default y | |
90 | ||
fbe934d6 | 91 | config MMU |
6bd33e1e CH |
92 | bool "MMU-based Paged Memory Management Support" |
93 | default y | |
94 | help | |
95 | Select if you want MMU-based virtualised addressing space | |
96 | support by paged memory management. If unsure, say 'Y'. | |
fbe934d6 | 97 | |
5ec9c4ff CH |
98 | config ZONE_DMA32 |
99 | bool | |
f1306f04 | 100 | default y if 64BIT |
5ec9c4ff | 101 | |
d95f1a54 LG |
102 | config VA_BITS |
103 | int | |
104 | default 32 if 32BIT | |
105 | default 39 if 64BIT | |
106 | ||
107 | config PA_BITS | |
108 | int | |
109 | default 34 if 32BIT | |
110 | default 56 if 64BIT | |
111 | ||
fbe934d6 PD |
112 | config PAGE_OFFSET |
113 | hex | |
114 | default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB | |
6bd33e1e | 115 | default 0x80000000 if 64BIT && !MMU |
fbe934d6 PD |
116 | default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB |
117 | default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB | |
118 | ||
d95f1a54 LG |
119 | config ARCH_FLATMEM_ENABLE |
120 | def_bool y | |
121 | ||
122 | config ARCH_SPARSEMEM_ENABLE | |
123 | def_bool y | |
aa273420 | 124 | depends on MMU |
d95f1a54 LG |
125 | select SPARSEMEM_VMEMMAP_ENABLE |
126 | ||
127 | config ARCH_SELECT_MEMORY_MODEL | |
128 | def_bool ARCH_SPARSEMEM_ENABLE | |
129 | ||
9e953cda AG |
130 | config ARCH_WANT_GENERAL_HUGETLB |
131 | def_bool y | |
132 | ||
133 | config SYS_SUPPORTS_HUGETLBFS | |
134 | def_bool y | |
135 | ||
fbe934d6 PD |
136 | config STACKTRACE_SUPPORT |
137 | def_bool y | |
138 | ||
10626c32 AK |
139 | config TRACE_IRQFLAGS_SUPPORT |
140 | def_bool y | |
141 | ||
fbe934d6 PD |
142 | config GENERIC_BUG |
143 | def_bool y | |
144 | depends on BUG | |
145 | select GENERIC_BUG_RELATIVE_POINTERS if 64BIT | |
146 | ||
147 | config GENERIC_BUG_RELATIVE_POINTERS | |
148 | bool | |
149 | ||
150 | config GENERIC_CALIBRATE_DELAY | |
151 | def_bool y | |
152 | ||
153 | config GENERIC_CSUM | |
154 | def_bool y | |
155 | ||
156 | config GENERIC_HWEIGHT | |
157 | def_bool y | |
158 | ||
f2c17aab | 159 | config FIX_EARLYCON_MEM |
0312a3d4 | 160 | def_bool MMU |
f2c17aab | 161 | |
fbe934d6 PD |
162 | config PGTABLE_LEVELS |
163 | int | |
164 | default 3 if 64BIT | |
165 | default 2 | |
166 | ||
0cbb8a32 LO |
167 | source "arch/riscv/Kconfig.socs" |
168 | ||
fbe934d6 PD |
169 | menu "Platform type" |
170 | ||
171 | choice | |
172 | prompt "Base ISA" | |
173 | default ARCH_RV64I | |
174 | help | |
86cca81a | 175 | This selects the base ISA that this kernel will target and must match |
fbe934d6 PD |
176 | the target platform. |
177 | ||
178 | config ARCH_RV32I | |
179 | bool "RV32I" | |
fbe934d6 | 180 | select 32BIT |
e3d59805 MR |
181 | select GENERIC_LIB_ASHLDI3 |
182 | select GENERIC_LIB_ASHRDI3 | |
183 | select GENERIC_LIB_LSHRDI3 | |
8f79125d | 184 | select GENERIC_LIB_UCMPDI2 |
6bd33e1e | 185 | select MMU |
fbe934d6 PD |
186 | |
187 | config ARCH_RV64I | |
188 | bool "RV64I" | |
fbe934d6 | 189 | select 64BIT |
c12d3362 | 190 | select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && GCC_VERSION >= 50000 |
10626c32 AK |
191 | select HAVE_FUNCTION_TRACER |
192 | select HAVE_FUNCTION_GRAPH_TRACER | |
a1d2a6b4 | 193 | select HAVE_FTRACE_MCOUNT_RECORD |
6bd33e1e CH |
194 | select HAVE_DYNAMIC_FTRACE if MMU |
195 | select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE | |
196 | select SWIOTLB if MMU | |
fbe934d6 PD |
197 | |
198 | endchoice | |
199 | ||
200 | # We must be able to map all physical memory into the kernel, but the compiler | |
201 | # is still a bit more efficient when generating code if it's setup in a manner | |
202 | # such that it can only map 2GiB of memory. | |
203 | choice | |
204 | prompt "Kernel Code Model" | |
205 | default CMODEL_MEDLOW if 32BIT | |
206 | default CMODEL_MEDANY if 64BIT | |
207 | ||
208 | config CMODEL_MEDLOW | |
209 | bool "medium low code model" | |
210 | config CMODEL_MEDANY | |
211 | bool "medium any code model" | |
212 | endchoice | |
213 | ||
ab1ef68e ZL |
214 | config MODULE_SECTIONS |
215 | bool | |
216 | select HAVE_MOD_ARCH_SPECIFIC | |
217 | ||
fbe934d6 PD |
218 | choice |
219 | prompt "Maximum Physical Memory" | |
220 | default MAXPHYSMEM_2GB if 32BIT | |
221 | default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW | |
222 | default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY | |
223 | ||
224 | config MAXPHYSMEM_2GB | |
225 | bool "2GiB" | |
226 | config MAXPHYSMEM_128GB | |
227 | depends on 64BIT && CMODEL_MEDANY | |
228 | bool "128GiB" | |
229 | endchoice | |
230 | ||
231 | ||
232 | config SMP | |
233 | bool "Symmetric Multi-Processing" | |
234 | help | |
235 | This enables support for systems with more than one CPU. If | |
236 | you say N here, the kernel will run on single and | |
237 | multiprocessor machines, but will use only one CPU of a | |
238 | multiprocessor machine. If you say Y here, the kernel will run | |
239 | on many, but not all, single processor machines. On a single | |
240 | processor machine, the kernel will run faster if you say N | |
241 | here. | |
242 | ||
243 | If you don't know what to do here, say N. | |
244 | ||
245 | config NR_CPUS | |
246 | int "Maximum number of CPUs (2-32)" | |
247 | range 2 32 | |
248 | depends on SMP | |
249 | default "8" | |
250 | ||
fbe934d6 PD |
251 | choice |
252 | prompt "CPU Tuning" | |
253 | default TUNE_GENERIC | |
254 | ||
255 | config TUNE_GENERIC | |
256 | bool "generic" | |
257 | ||
258 | endchoice | |
259 | ||
260 | config RISCV_ISA_C | |
261 | bool "Emit compressed instructions when building Linux" | |
262 | default y | |
263 | help | |
264 | Adds "C" to the ISA subsets that the toolchain is allowed to emit | |
265 | when building Linux, which results in compressed instructions in the | |
266 | Linux binary. | |
267 | ||
268 | If you don't know what to do here, say Y. | |
269 | ||
178e9fc4 AK |
270 | menu "supported PMU type" |
271 | depends on PERF_EVENTS | |
272 | ||
273 | config RISCV_BASE_PMU | |
274 | bool "Base Performance Monitoring Unit" | |
275 | def_bool y | |
276 | help | |
277 | A base PMU that serves as a reference implementation and has limited | |
278 | feature of perf. It can run on any RISC-V machines so serves as the | |
279 | fallback, but this option can also be disable to reduce kernel size. | |
280 | ||
281 | endmenu | |
282 | ||
9671f706 AK |
283 | config FPU |
284 | bool "FPU support" | |
285 | default y | |
286 | help | |
287 | Say N here if you want to disable all floating-point related procedure | |
288 | in the kernel. | |
289 | ||
290 | If you don't know what to do here, say Y. | |
291 | ||
fbe934d6 PD |
292 | endmenu |
293 | ||
aef53f97 | 294 | menu "Kernel features" |
fbe934d6 | 295 | |
fbe934d6 PD |
296 | source "kernel/Kconfig.hz" |
297 | ||
5340627e DA |
298 | config SECCOMP |
299 | bool "Enable seccomp to safely compute untrusted bytecode" | |
300 | help | |
301 | This kernel feature is useful for number crunching applications | |
302 | that may need to compute untrusted bytecode during their | |
303 | execution. By using pipes or other transports made available to | |
304 | the process as file descriptors supporting the read/write | |
305 | syscalls, it's possible to isolate those applications in | |
306 | their own address space using seccomp. Once seccomp is | |
307 | enabled via prctl(PR_SET_SECCOMP), it cannot be disabled | |
308 | and the task is only allowed to execute a few safe syscalls | |
309 | defined by each seccomp mode. | |
310 | ||
fbe934d6 PD |
311 | endmenu |
312 | ||
aef53f97 NK |
313 | menu "Boot options" |
314 | ||
3aed8c43 NK |
315 | config CMDLINE |
316 | string "Built-in kernel command line" | |
aef53f97 | 317 | help |
3aed8c43 NK |
318 | For most platforms, the arguments for the kernel's command line |
319 | are provided at run-time, during boot. However, there are cases | |
320 | where either no arguments are being provided or the provided | |
321 | arguments are insufficient or even invalid. | |
aef53f97 | 322 | |
3aed8c43 NK |
323 | When that occurs, it is possible to define a built-in command |
324 | line here and choose how the kernel should use it later on. | |
aef53f97 | 325 | |
3aed8c43 NK |
326 | choice |
327 | prompt "Built-in command line usage" if CMDLINE != "" | |
328 | default CMDLINE_FALLBACK | |
329 | help | |
330 | Choose how the kernel will handle the provided built-in command | |
331 | line. | |
aef53f97 | 332 | |
3aed8c43 NK |
333 | config CMDLINE_FALLBACK |
334 | bool "Use bootloader kernel arguments if available" | |
aef53f97 | 335 | help |
3aed8c43 NK |
336 | Use the built-in command line as fallback in case we get nothing |
337 | during boot. This is the default behaviour. | |
338 | ||
339 | config CMDLINE_EXTEND | |
340 | bool "Extend bootloader kernel arguments" | |
341 | help | |
342 | The command-line arguments provided during boot will be | |
343 | appended to the built-in command line. This is useful in | |
344 | cases where the provided arguments are insufficient and | |
345 | you don't want to or cannot modify them. | |
346 | ||
aef53f97 NK |
347 | |
348 | config CMDLINE_FORCE | |
3aed8c43 | 349 | bool "Always use the default kernel command string" |
aef53f97 | 350 | help |
3aed8c43 NK |
351 | Always use the built-in command line, even if we get one during |
352 | boot. This is useful in case you need to override the provided | |
353 | command line on systems where you don't have or want control | |
354 | over it. | |
aef53f97 | 355 | |
3aed8c43 | 356 | endchoice |
aef53f97 NK |
357 | |
358 | endmenu | |
359 | ||
fbe934d6 PD |
360 | menu "Power management options" |
361 | ||
8636a1f9 | 362 | source "kernel/power/Kconfig" |
fbe934d6 PD |
363 | |
364 | endmenu |