Commit | Line | Data |
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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 | |
d4a451d5 CH |
15 | # even on 32-bit, physical (and DMA) addresses are > 32-bits |
16 | select PHYS_ADDR_T_64BIT | |
fbe934d6 PD |
17 | select OF |
18 | select OF_EARLY_FLATTREE | |
19 | select OF_IRQ | |
ad97f9df | 20 | select ARCH_HAS_BINFMT_FLAT |
fbe934d6 PD |
21 | select ARCH_WANT_FRAME_POINTERS |
22 | select CLONE_BACKWARDS | |
23 | select COMMON_CLK | |
24 | select GENERIC_CLOCKEVENTS | |
25 | select GENERIC_CPU_DEVICES | |
26 | select GENERIC_IRQ_SHOW | |
27 | select GENERIC_PCI_IOMAP | |
9b9afe4a | 28 | select GENERIC_SCHED_CLOCK |
fbe934d6 PD |
29 | select GENERIC_STRNCPY_FROM_USER |
30 | select GENERIC_STRNLEN_USER | |
31 | select GENERIC_SMP_IDLE_THREAD | |
09afac77 | 32 | select GENERIC_ATOMIC64 if !64BIT |
efe75c49 | 33 | select HAVE_ARCH_AUDITSYSCALL |
5ec9c4ff | 34 | select HAVE_MEMBLOCK_NODE_MAP |
fbe934d6 | 35 | select HAVE_DMA_CONTIGUOUS |
b90edb33 | 36 | select HAVE_FUTEX_CMPXCHG if FUTEX |
178e9fc4 | 37 | select HAVE_PERF_EVENTS |
5aeb1b36 | 38 | select HAVE_SYSCALL_TRACEPOINTS |
fbe934d6 | 39 | select IRQ_DOMAIN |
fbe934d6 PD |
40 | select SPARSE_IRQ |
41 | select SYSCTL_EXCEPTION_TRACE | |
42 | select HAVE_ARCH_TRACEHOOK | |
eb01d42a | 43 | select HAVE_PCI |
fbe934d6 | 44 | select MODULES_USE_ELF_RELA if MODULES |
2cffc956 | 45 | select MODULE_SECTIONS if MODULES |
fbe934d6 | 46 | select THREAD_INFO_IN_TASK |
2eac9c2d | 47 | select PCI_DOMAINS_GENERIC if PCI |
eb01d42a | 48 | select PCI_MSI if PCI |
fbe934d6 | 49 | select RISCV_TIMER |
cc6c9848 | 50 | select GENERIC_IRQ_MULTI_HANDLER |
3010a5ea | 51 | select ARCH_HAS_PTE_SPECIAL |
b012980d | 52 | select ARCH_HAS_MMIOWB |
2353ecc6 | 53 | select HAVE_EBPF_JIT if 64BIT |
91abaeaa | 54 | select EDAC_SUPPORT |
9e953cda AG |
55 | select ARCH_HAS_GIGANTIC_PAGE |
56 | select ARCH_WANT_HUGE_PMD_SHARE if 64BIT | |
fbe934d6 PD |
57 | |
58 | config MMU | |
59 | def_bool y | |
60 | ||
5ec9c4ff CH |
61 | config ZONE_DMA32 |
62 | bool | |
f1306f04 | 63 | default y if 64BIT |
5ec9c4ff | 64 | |
fbe934d6 PD |
65 | config PAGE_OFFSET |
66 | hex | |
67 | default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB | |
68 | default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB | |
69 | default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB | |
70 | ||
9e953cda AG |
71 | config ARCH_WANT_GENERAL_HUGETLB |
72 | def_bool y | |
73 | ||
74 | config SYS_SUPPORTS_HUGETLBFS | |
75 | def_bool y | |
76 | ||
fbe934d6 PD |
77 | config STACKTRACE_SUPPORT |
78 | def_bool y | |
79 | ||
10626c32 AK |
80 | config TRACE_IRQFLAGS_SUPPORT |
81 | def_bool y | |
82 | ||
fbe934d6 PD |
83 | config GENERIC_BUG |
84 | def_bool y | |
85 | depends on BUG | |
86 | select GENERIC_BUG_RELATIVE_POINTERS if 64BIT | |
87 | ||
88 | config GENERIC_BUG_RELATIVE_POINTERS | |
89 | bool | |
90 | ||
91 | config GENERIC_CALIBRATE_DELAY | |
92 | def_bool y | |
93 | ||
94 | config GENERIC_CSUM | |
95 | def_bool y | |
96 | ||
97 | config GENERIC_HWEIGHT | |
98 | def_bool y | |
99 | ||
f2c17aab AP |
100 | config FIX_EARLYCON_MEM |
101 | def_bool y | |
102 | ||
fbe934d6 PD |
103 | config PGTABLE_LEVELS |
104 | int | |
105 | default 3 if 64BIT | |
106 | default 2 | |
107 | ||
0cbb8a32 LO |
108 | source "arch/riscv/Kconfig.socs" |
109 | ||
fbe934d6 PD |
110 | menu "Platform type" |
111 | ||
112 | choice | |
113 | prompt "Base ISA" | |
114 | default ARCH_RV64I | |
115 | help | |
86cca81a | 116 | This selects the base ISA that this kernel will target and must match |
fbe934d6 PD |
117 | the target platform. |
118 | ||
119 | config ARCH_RV32I | |
120 | bool "RV32I" | |
fbe934d6 | 121 | select 32BIT |
e3d59805 MR |
122 | select GENERIC_LIB_ASHLDI3 |
123 | select GENERIC_LIB_ASHRDI3 | |
124 | select GENERIC_LIB_LSHRDI3 | |
8f79125d | 125 | select GENERIC_LIB_UCMPDI2 |
fbe934d6 PD |
126 | |
127 | config ARCH_RV64I | |
128 | bool "RV64I" | |
fbe934d6 | 129 | select 64BIT |
ee592884 | 130 | select ARCH_SUPPORTS_INT128 if GCC_VERSION >= 50000 |
10626c32 AK |
131 | select HAVE_FUNCTION_TRACER |
132 | select HAVE_FUNCTION_GRAPH_TRACER | |
a1d2a6b4 | 133 | select HAVE_FTRACE_MCOUNT_RECORD |
c15ac4fd | 134 | select HAVE_DYNAMIC_FTRACE |
aea4c671 | 135 | select HAVE_DYNAMIC_FTRACE_WITH_REGS |
10314e09 | 136 | select SWIOTLB |
fbe934d6 PD |
137 | |
138 | endchoice | |
139 | ||
140 | # We must be able to map all physical memory into the kernel, but the compiler | |
141 | # is still a bit more efficient when generating code if it's setup in a manner | |
142 | # such that it can only map 2GiB of memory. | |
143 | choice | |
144 | prompt "Kernel Code Model" | |
145 | default CMODEL_MEDLOW if 32BIT | |
146 | default CMODEL_MEDANY if 64BIT | |
147 | ||
148 | config CMODEL_MEDLOW | |
149 | bool "medium low code model" | |
150 | config CMODEL_MEDANY | |
151 | bool "medium any code model" | |
152 | endchoice | |
153 | ||
ab1ef68e ZL |
154 | config MODULE_SECTIONS |
155 | bool | |
156 | select HAVE_MOD_ARCH_SPECIFIC | |
157 | ||
fbe934d6 PD |
158 | choice |
159 | prompt "Maximum Physical Memory" | |
160 | default MAXPHYSMEM_2GB if 32BIT | |
161 | default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW | |
162 | default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY | |
163 | ||
164 | config MAXPHYSMEM_2GB | |
165 | bool "2GiB" | |
166 | config MAXPHYSMEM_128GB | |
167 | depends on 64BIT && CMODEL_MEDANY | |
168 | bool "128GiB" | |
169 | endchoice | |
170 | ||
171 | ||
172 | config SMP | |
173 | bool "Symmetric Multi-Processing" | |
174 | help | |
175 | This enables support for systems with more than one CPU. If | |
176 | you say N here, the kernel will run on single and | |
177 | multiprocessor machines, but will use only one CPU of a | |
178 | multiprocessor machine. If you say Y here, the kernel will run | |
179 | on many, but not all, single processor machines. On a single | |
180 | processor machine, the kernel will run faster if you say N | |
181 | here. | |
182 | ||
183 | If you don't know what to do here, say N. | |
184 | ||
185 | config NR_CPUS | |
186 | int "Maximum number of CPUs (2-32)" | |
187 | range 2 32 | |
188 | depends on SMP | |
189 | default "8" | |
190 | ||
fbe934d6 PD |
191 | choice |
192 | prompt "CPU Tuning" | |
193 | default TUNE_GENERIC | |
194 | ||
195 | config TUNE_GENERIC | |
196 | bool "generic" | |
197 | ||
198 | endchoice | |
199 | ||
200 | config RISCV_ISA_C | |
201 | bool "Emit compressed instructions when building Linux" | |
202 | default y | |
203 | help | |
204 | Adds "C" to the ISA subsets that the toolchain is allowed to emit | |
205 | when building Linux, which results in compressed instructions in the | |
206 | Linux binary. | |
207 | ||
208 | If you don't know what to do here, say Y. | |
209 | ||
178e9fc4 AK |
210 | menu "supported PMU type" |
211 | depends on PERF_EVENTS | |
212 | ||
213 | config RISCV_BASE_PMU | |
214 | bool "Base Performance Monitoring Unit" | |
215 | def_bool y | |
216 | help | |
217 | A base PMU that serves as a reference implementation and has limited | |
218 | feature of perf. It can run on any RISC-V machines so serves as the | |
219 | fallback, but this option can also be disable to reduce kernel size. | |
220 | ||
221 | endmenu | |
222 | ||
9671f706 AK |
223 | config FPU |
224 | bool "FPU support" | |
225 | default y | |
226 | help | |
227 | Say N here if you want to disable all floating-point related procedure | |
228 | in the kernel. | |
229 | ||
230 | If you don't know what to do here, say Y. | |
231 | ||
fbe934d6 PD |
232 | endmenu |
233 | ||
aef53f97 | 234 | menu "Kernel features" |
fbe934d6 | 235 | |
fbe934d6 PD |
236 | source "kernel/Kconfig.hz" |
237 | ||
238 | endmenu | |
239 | ||
aef53f97 NK |
240 | menu "Boot options" |
241 | ||
3aed8c43 NK |
242 | config CMDLINE |
243 | string "Built-in kernel command line" | |
aef53f97 | 244 | help |
3aed8c43 NK |
245 | For most platforms, the arguments for the kernel's command line |
246 | are provided at run-time, during boot. However, there are cases | |
247 | where either no arguments are being provided or the provided | |
248 | arguments are insufficient or even invalid. | |
aef53f97 | 249 | |
3aed8c43 NK |
250 | When that occurs, it is possible to define a built-in command |
251 | line here and choose how the kernel should use it later on. | |
aef53f97 | 252 | |
3aed8c43 NK |
253 | choice |
254 | prompt "Built-in command line usage" if CMDLINE != "" | |
255 | default CMDLINE_FALLBACK | |
256 | help | |
257 | Choose how the kernel will handle the provided built-in command | |
258 | line. | |
aef53f97 | 259 | |
3aed8c43 NK |
260 | config CMDLINE_FALLBACK |
261 | bool "Use bootloader kernel arguments if available" | |
aef53f97 | 262 | help |
3aed8c43 NK |
263 | Use the built-in command line as fallback in case we get nothing |
264 | during boot. This is the default behaviour. | |
265 | ||
266 | config CMDLINE_EXTEND | |
267 | bool "Extend bootloader kernel arguments" | |
268 | help | |
269 | The command-line arguments provided during boot will be | |
270 | appended to the built-in command line. This is useful in | |
271 | cases where the provided arguments are insufficient and | |
272 | you don't want to or cannot modify them. | |
273 | ||
aef53f97 NK |
274 | |
275 | config CMDLINE_FORCE | |
3aed8c43 | 276 | bool "Always use the default kernel command string" |
aef53f97 | 277 | help |
3aed8c43 NK |
278 | Always use the built-in command line, even if we get one during |
279 | boot. This is useful in case you need to override the provided | |
280 | command line on systems where you don't have or want control | |
281 | over it. | |
aef53f97 | 282 | |
3aed8c43 | 283 | endchoice |
aef53f97 NK |
284 | |
285 | endmenu | |
286 | ||
fbe934d6 PD |
287 | menu "Power management options" |
288 | ||
8636a1f9 | 289 | source "kernel/power/Kconfig" |
fbe934d6 PD |
290 | |
291 | endmenu |