Commit | Line | Data |
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fbe934d6 PD |
1 | # |
2 | # For a description of the syntax of this configuration file, | |
3 | # see Documentation/kbuild/kconfig-language.txt. | |
4 | # | |
5 | ||
c3e4ed01 CH |
6 | config 64BIT |
7 | bool | |
8 | ||
9 | config 32BIT | |
10 | bool | |
11 | ||
fbe934d6 PD |
12 | config RISCV |
13 | def_bool y | |
d4a451d5 CH |
14 | # even on 32-bit, physical (and DMA) addresses are > 32-bits |
15 | select PHYS_ADDR_T_64BIT | |
fbe934d6 PD |
16 | select OF |
17 | select OF_EARLY_FLATTREE | |
18 | select OF_IRQ | |
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 |
fbe934d6 PD |
27 | select GENERIC_STRNCPY_FROM_USER |
28 | select GENERIC_STRNLEN_USER | |
29 | select GENERIC_SMP_IDLE_THREAD | |
30 | select GENERIC_ATOMIC64 if !64BIT || !RISCV_ISA_A | |
efe75c49 | 31 | select HAVE_ARCH_AUDITSYSCALL |
5ec9c4ff | 32 | select HAVE_MEMBLOCK_NODE_MAP |
fbe934d6 | 33 | select HAVE_DMA_CONTIGUOUS |
b90edb33 | 34 | select HAVE_FUTEX_CMPXCHG if FUTEX |
fbe934d6 | 35 | select HAVE_GENERIC_DMA_COHERENT |
178e9fc4 | 36 | select HAVE_PERF_EVENTS |
5aeb1b36 | 37 | select HAVE_SYSCALL_TRACEPOINTS |
fbe934d6 | 38 | select IRQ_DOMAIN |
fbe934d6 PD |
39 | select RISCV_ISA_A if SMP |
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 |
fbe934d6 PD |
52 | |
53 | config MMU | |
54 | def_bool y | |
55 | ||
5ec9c4ff CH |
56 | config ZONE_DMA32 |
57 | bool | |
f1306f04 | 58 | default y if 64BIT |
5ec9c4ff | 59 | |
fbe934d6 PD |
60 | config PAGE_OFFSET |
61 | hex | |
62 | default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB | |
63 | default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB | |
64 | default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB | |
65 | ||
66 | config STACKTRACE_SUPPORT | |
67 | def_bool y | |
68 | ||
10626c32 AK |
69 | config TRACE_IRQFLAGS_SUPPORT |
70 | def_bool y | |
71 | ||
fbe934d6 PD |
72 | config RWSEM_GENERIC_SPINLOCK |
73 | def_bool y | |
74 | ||
75 | config GENERIC_BUG | |
76 | def_bool y | |
77 | depends on BUG | |
78 | select GENERIC_BUG_RELATIVE_POINTERS if 64BIT | |
79 | ||
80 | config GENERIC_BUG_RELATIVE_POINTERS | |
81 | bool | |
82 | ||
83 | config GENERIC_CALIBRATE_DELAY | |
84 | def_bool y | |
85 | ||
86 | config GENERIC_CSUM | |
87 | def_bool y | |
88 | ||
89 | config GENERIC_HWEIGHT | |
90 | def_bool y | |
91 | ||
92 | config PGTABLE_LEVELS | |
93 | int | |
94 | default 3 if 64BIT | |
95 | default 2 | |
96 | ||
97 | config HAVE_KPROBES | |
98 | def_bool n | |
99 | ||
fbe934d6 PD |
100 | menu "Platform type" |
101 | ||
102 | choice | |
103 | prompt "Base ISA" | |
104 | default ARCH_RV64I | |
105 | help | |
106 | This selects the base ISA that this kernel will traget and must match | |
107 | the target platform. | |
108 | ||
109 | config ARCH_RV32I | |
110 | bool "RV32I" | |
fbe934d6 | 111 | select 32BIT |
e3d59805 MR |
112 | select GENERIC_LIB_ASHLDI3 |
113 | select GENERIC_LIB_ASHRDI3 | |
114 | select GENERIC_LIB_LSHRDI3 | |
8f79125d | 115 | select GENERIC_LIB_UCMPDI2 |
fbe934d6 PD |
116 | |
117 | config ARCH_RV64I | |
118 | bool "RV64I" | |
fbe934d6 | 119 | select 64BIT |
ee592884 | 120 | select ARCH_SUPPORTS_INT128 if GCC_VERSION >= 50000 |
10626c32 AK |
121 | select HAVE_FUNCTION_TRACER |
122 | select HAVE_FUNCTION_GRAPH_TRACER | |
a1d2a6b4 | 123 | select HAVE_FTRACE_MCOUNT_RECORD |
c15ac4fd | 124 | select HAVE_DYNAMIC_FTRACE |
aea4c671 | 125 | select HAVE_DYNAMIC_FTRACE_WITH_REGS |
10314e09 | 126 | select SWIOTLB |
fbe934d6 PD |
127 | |
128 | endchoice | |
129 | ||
130 | # We must be able to map all physical memory into the kernel, but the compiler | |
131 | # is still a bit more efficient when generating code if it's setup in a manner | |
132 | # such that it can only map 2GiB of memory. | |
133 | choice | |
134 | prompt "Kernel Code Model" | |
135 | default CMODEL_MEDLOW if 32BIT | |
136 | default CMODEL_MEDANY if 64BIT | |
137 | ||
138 | config CMODEL_MEDLOW | |
139 | bool "medium low code model" | |
140 | config CMODEL_MEDANY | |
141 | bool "medium any code model" | |
142 | endchoice | |
143 | ||
ab1ef68e ZL |
144 | config MODULE_SECTIONS |
145 | bool | |
146 | select HAVE_MOD_ARCH_SPECIFIC | |
147 | ||
fbe934d6 PD |
148 | choice |
149 | prompt "Maximum Physical Memory" | |
150 | default MAXPHYSMEM_2GB if 32BIT | |
151 | default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW | |
152 | default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY | |
153 | ||
154 | config MAXPHYSMEM_2GB | |
155 | bool "2GiB" | |
156 | config MAXPHYSMEM_128GB | |
157 | depends on 64BIT && CMODEL_MEDANY | |
158 | bool "128GiB" | |
159 | endchoice | |
160 | ||
161 | ||
162 | config SMP | |
163 | bool "Symmetric Multi-Processing" | |
164 | help | |
165 | This enables support for systems with more than one CPU. If | |
166 | you say N here, the kernel will run on single and | |
167 | multiprocessor machines, but will use only one CPU of a | |
168 | multiprocessor machine. If you say Y here, the kernel will run | |
169 | on many, but not all, single processor machines. On a single | |
170 | processor machine, the kernel will run faster if you say N | |
171 | here. | |
172 | ||
173 | If you don't know what to do here, say N. | |
174 | ||
175 | config NR_CPUS | |
176 | int "Maximum number of CPUs (2-32)" | |
177 | range 2 32 | |
178 | depends on SMP | |
179 | default "8" | |
180 | ||
fbe934d6 PD |
181 | choice |
182 | prompt "CPU Tuning" | |
183 | default TUNE_GENERIC | |
184 | ||
185 | config TUNE_GENERIC | |
186 | bool "generic" | |
187 | ||
188 | endchoice | |
189 | ||
190 | config RISCV_ISA_C | |
191 | bool "Emit compressed instructions when building Linux" | |
192 | default y | |
193 | help | |
194 | Adds "C" to the ISA subsets that the toolchain is allowed to emit | |
195 | when building Linux, which results in compressed instructions in the | |
196 | Linux binary. | |
197 | ||
198 | If you don't know what to do here, say Y. | |
199 | ||
200 | config RISCV_ISA_A | |
201 | def_bool y | |
202 | ||
178e9fc4 AK |
203 | menu "supported PMU type" |
204 | depends on PERF_EVENTS | |
205 | ||
206 | config RISCV_BASE_PMU | |
207 | bool "Base Performance Monitoring Unit" | |
208 | def_bool y | |
209 | help | |
210 | A base PMU that serves as a reference implementation and has limited | |
211 | feature of perf. It can run on any RISC-V machines so serves as the | |
212 | fallback, but this option can also be disable to reduce kernel size. | |
213 | ||
214 | endmenu | |
215 | ||
9671f706 AK |
216 | config FPU |
217 | bool "FPU support" | |
218 | default y | |
219 | help | |
220 | Say N here if you want to disable all floating-point related procedure | |
221 | in the kernel. | |
222 | ||
223 | If you don't know what to do here, say Y. | |
224 | ||
fbe934d6 PD |
225 | endmenu |
226 | ||
aef53f97 | 227 | menu "Kernel features" |
fbe934d6 | 228 | |
fbe934d6 PD |
229 | source "kernel/Kconfig.hz" |
230 | ||
231 | endmenu | |
232 | ||
aef53f97 NK |
233 | menu "Boot options" |
234 | ||
3aed8c43 NK |
235 | config CMDLINE |
236 | string "Built-in kernel command line" | |
aef53f97 | 237 | help |
3aed8c43 NK |
238 | For most platforms, the arguments for the kernel's command line |
239 | are provided at run-time, during boot. However, there are cases | |
240 | where either no arguments are being provided or the provided | |
241 | arguments are insufficient or even invalid. | |
aef53f97 | 242 | |
3aed8c43 NK |
243 | When that occurs, it is possible to define a built-in command |
244 | line here and choose how the kernel should use it later on. | |
aef53f97 | 245 | |
3aed8c43 NK |
246 | choice |
247 | prompt "Built-in command line usage" if CMDLINE != "" | |
248 | default CMDLINE_FALLBACK | |
249 | help | |
250 | Choose how the kernel will handle the provided built-in command | |
251 | line. | |
aef53f97 | 252 | |
3aed8c43 NK |
253 | config CMDLINE_FALLBACK |
254 | bool "Use bootloader kernel arguments if available" | |
aef53f97 | 255 | help |
3aed8c43 NK |
256 | Use the built-in command line as fallback in case we get nothing |
257 | during boot. This is the default behaviour. | |
258 | ||
259 | config CMDLINE_EXTEND | |
260 | bool "Extend bootloader kernel arguments" | |
261 | help | |
262 | The command-line arguments provided during boot will be | |
263 | appended to the built-in command line. This is useful in | |
264 | cases where the provided arguments are insufficient and | |
265 | you don't want to or cannot modify them. | |
266 | ||
aef53f97 NK |
267 | |
268 | config CMDLINE_FORCE | |
3aed8c43 | 269 | bool "Always use the default kernel command string" |
aef53f97 | 270 | help |
3aed8c43 NK |
271 | Always use the built-in command line, even if we get one during |
272 | boot. This is useful in case you need to override the provided | |
273 | command line on systems where you don't have or want control | |
274 | over it. | |
aef53f97 | 275 | |
3aed8c43 | 276 | endchoice |
aef53f97 NK |
277 | |
278 | endmenu | |
279 | ||
fbe934d6 PD |
280 | menu "Power management options" |
281 | ||
8636a1f9 | 282 | source "kernel/power/Kconfig" |
fbe934d6 PD |
283 | |
284 | endmenu |