| 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 | # |
| 6 | |
| 7 | config 64BIT |
| 8 | bool |
| 9 | |
| 10 | config 32BIT |
| 11 | bool |
| 12 | |
| 13 | config RISCV |
| 14 | def_bool y |
| 15 | # even on 32-bit, physical (and DMA) addresses are > 32-bits |
| 16 | select PHYS_ADDR_T_64BIT |
| 17 | select OF |
| 18 | select OF_EARLY_FLATTREE |
| 19 | select OF_IRQ |
| 20 | select ARCH_HAS_BINFMT_FLAT |
| 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 |
| 28 | select GENERIC_SCHED_CLOCK |
| 29 | select GENERIC_STRNCPY_FROM_USER |
| 30 | select GENERIC_STRNLEN_USER |
| 31 | select GENERIC_SMP_IDLE_THREAD |
| 32 | select GENERIC_ATOMIC64 if !64BIT |
| 33 | select HAVE_ARCH_AUDITSYSCALL |
| 34 | select HAVE_MEMBLOCK_NODE_MAP |
| 35 | select HAVE_DMA_CONTIGUOUS |
| 36 | select HAVE_FUTEX_CMPXCHG if FUTEX |
| 37 | select HAVE_PERF_EVENTS |
| 38 | select HAVE_PERF_REGS |
| 39 | select HAVE_PERF_USER_STACK_DUMP |
| 40 | select HAVE_SYSCALL_TRACEPOINTS |
| 41 | select IRQ_DOMAIN |
| 42 | select SPARSE_IRQ |
| 43 | select SYSCTL_EXCEPTION_TRACE |
| 44 | select HAVE_ARCH_TRACEHOOK |
| 45 | select HAVE_PCI |
| 46 | select MODULES_USE_ELF_RELA if MODULES |
| 47 | select MODULE_SECTIONS if MODULES |
| 48 | select THREAD_INFO_IN_TASK |
| 49 | select PCI_DOMAINS_GENERIC if PCI |
| 50 | select PCI_MSI if PCI |
| 51 | select RISCV_TIMER |
| 52 | select GENERIC_IRQ_MULTI_HANDLER |
| 53 | select GENERIC_ARCH_TOPOLOGY if SMP |
| 54 | select ARCH_HAS_PTE_SPECIAL |
| 55 | select ARCH_HAS_MMIOWB |
| 56 | select HAVE_EBPF_JIT if 64BIT |
| 57 | select EDAC_SUPPORT |
| 58 | select ARCH_HAS_GIGANTIC_PAGE |
| 59 | select ARCH_WANT_HUGE_PMD_SHARE if 64BIT |
| 60 | select SPARSEMEM_STATIC if 32BIT |
| 61 | |
| 62 | config MMU |
| 63 | def_bool y |
| 64 | |
| 65 | config ZONE_DMA32 |
| 66 | bool |
| 67 | default y if 64BIT |
| 68 | |
| 69 | config VA_BITS |
| 70 | int |
| 71 | default 32 if 32BIT |
| 72 | default 39 if 64BIT |
| 73 | |
| 74 | config PA_BITS |
| 75 | int |
| 76 | default 34 if 32BIT |
| 77 | default 56 if 64BIT |
| 78 | |
| 79 | config PAGE_OFFSET |
| 80 | hex |
| 81 | default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB |
| 82 | default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB |
| 83 | default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB |
| 84 | |
| 85 | config ARCH_FLATMEM_ENABLE |
| 86 | def_bool y |
| 87 | |
| 88 | config ARCH_SPARSEMEM_ENABLE |
| 89 | def_bool y |
| 90 | select SPARSEMEM_VMEMMAP_ENABLE |
| 91 | |
| 92 | config ARCH_SELECT_MEMORY_MODEL |
| 93 | def_bool ARCH_SPARSEMEM_ENABLE |
| 94 | |
| 95 | config ARCH_WANT_GENERAL_HUGETLB |
| 96 | def_bool y |
| 97 | |
| 98 | config SYS_SUPPORTS_HUGETLBFS |
| 99 | def_bool y |
| 100 | |
| 101 | config STACKTRACE_SUPPORT |
| 102 | def_bool y |
| 103 | |
| 104 | config TRACE_IRQFLAGS_SUPPORT |
| 105 | def_bool y |
| 106 | |
| 107 | config GENERIC_BUG |
| 108 | def_bool y |
| 109 | depends on BUG |
| 110 | select GENERIC_BUG_RELATIVE_POINTERS if 64BIT |
| 111 | |
| 112 | config GENERIC_BUG_RELATIVE_POINTERS |
| 113 | bool |
| 114 | |
| 115 | config GENERIC_CALIBRATE_DELAY |
| 116 | def_bool y |
| 117 | |
| 118 | config GENERIC_CSUM |
| 119 | def_bool y |
| 120 | |
| 121 | config GENERIC_HWEIGHT |
| 122 | def_bool y |
| 123 | |
| 124 | config FIX_EARLYCON_MEM |
| 125 | def_bool y |
| 126 | |
| 127 | config PGTABLE_LEVELS |
| 128 | int |
| 129 | default 3 if 64BIT |
| 130 | default 2 |
| 131 | |
| 132 | source "arch/riscv/Kconfig.socs" |
| 133 | |
| 134 | menu "Platform type" |
| 135 | |
| 136 | choice |
| 137 | prompt "Base ISA" |
| 138 | default ARCH_RV64I |
| 139 | help |
| 140 | This selects the base ISA that this kernel will target and must match |
| 141 | the target platform. |
| 142 | |
| 143 | config ARCH_RV32I |
| 144 | bool "RV32I" |
| 145 | select 32BIT |
| 146 | select GENERIC_LIB_ASHLDI3 |
| 147 | select GENERIC_LIB_ASHRDI3 |
| 148 | select GENERIC_LIB_LSHRDI3 |
| 149 | select GENERIC_LIB_UCMPDI2 |
| 150 | |
| 151 | config ARCH_RV64I |
| 152 | bool "RV64I" |
| 153 | select 64BIT |
| 154 | select ARCH_SUPPORTS_INT128 if GCC_VERSION >= 50000 |
| 155 | select HAVE_FUNCTION_TRACER |
| 156 | select HAVE_FUNCTION_GRAPH_TRACER |
| 157 | select HAVE_FTRACE_MCOUNT_RECORD |
| 158 | select HAVE_DYNAMIC_FTRACE |
| 159 | select HAVE_DYNAMIC_FTRACE_WITH_REGS |
| 160 | select SWIOTLB |
| 161 | |
| 162 | endchoice |
| 163 | |
| 164 | # We must be able to map all physical memory into the kernel, but the compiler |
| 165 | # is still a bit more efficient when generating code if it's setup in a manner |
| 166 | # such that it can only map 2GiB of memory. |
| 167 | choice |
| 168 | prompt "Kernel Code Model" |
| 169 | default CMODEL_MEDLOW if 32BIT |
| 170 | default CMODEL_MEDANY if 64BIT |
| 171 | |
| 172 | config CMODEL_MEDLOW |
| 173 | bool "medium low code model" |
| 174 | config CMODEL_MEDANY |
| 175 | bool "medium any code model" |
| 176 | endchoice |
| 177 | |
| 178 | config MODULE_SECTIONS |
| 179 | bool |
| 180 | select HAVE_MOD_ARCH_SPECIFIC |
| 181 | |
| 182 | choice |
| 183 | prompt "Maximum Physical Memory" |
| 184 | default MAXPHYSMEM_2GB if 32BIT |
| 185 | default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW |
| 186 | default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY |
| 187 | |
| 188 | config MAXPHYSMEM_2GB |
| 189 | bool "2GiB" |
| 190 | config MAXPHYSMEM_128GB |
| 191 | depends on 64BIT && CMODEL_MEDANY |
| 192 | bool "128GiB" |
| 193 | endchoice |
| 194 | |
| 195 | |
| 196 | config SMP |
| 197 | bool "Symmetric Multi-Processing" |
| 198 | help |
| 199 | This enables support for systems with more than one CPU. If |
| 200 | you say N here, the kernel will run on single and |
| 201 | multiprocessor machines, but will use only one CPU of a |
| 202 | multiprocessor machine. If you say Y here, the kernel will run |
| 203 | on many, but not all, single processor machines. On a single |
| 204 | processor machine, the kernel will run faster if you say N |
| 205 | here. |
| 206 | |
| 207 | If you don't know what to do here, say N. |
| 208 | |
| 209 | config NR_CPUS |
| 210 | int "Maximum number of CPUs (2-32)" |
| 211 | range 2 32 |
| 212 | depends on SMP |
| 213 | default "8" |
| 214 | |
| 215 | choice |
| 216 | prompt "CPU Tuning" |
| 217 | default TUNE_GENERIC |
| 218 | |
| 219 | config TUNE_GENERIC |
| 220 | bool "generic" |
| 221 | |
| 222 | endchoice |
| 223 | |
| 224 | config RISCV_ISA_C |
| 225 | bool "Emit compressed instructions when building Linux" |
| 226 | default y |
| 227 | help |
| 228 | Adds "C" to the ISA subsets that the toolchain is allowed to emit |
| 229 | when building Linux, which results in compressed instructions in the |
| 230 | Linux binary. |
| 231 | |
| 232 | If you don't know what to do here, say Y. |
| 233 | |
| 234 | menu "supported PMU type" |
| 235 | depends on PERF_EVENTS |
| 236 | |
| 237 | config RISCV_BASE_PMU |
| 238 | bool "Base Performance Monitoring Unit" |
| 239 | def_bool y |
| 240 | help |
| 241 | A base PMU that serves as a reference implementation and has limited |
| 242 | feature of perf. It can run on any RISC-V machines so serves as the |
| 243 | fallback, but this option can also be disable to reduce kernel size. |
| 244 | |
| 245 | endmenu |
| 246 | |
| 247 | config FPU |
| 248 | bool "FPU support" |
| 249 | default y |
| 250 | help |
| 251 | Say N here if you want to disable all floating-point related procedure |
| 252 | in the kernel. |
| 253 | |
| 254 | If you don't know what to do here, say Y. |
| 255 | |
| 256 | endmenu |
| 257 | |
| 258 | menu "Kernel features" |
| 259 | |
| 260 | source "kernel/Kconfig.hz" |
| 261 | |
| 262 | endmenu |
| 263 | |
| 264 | menu "Boot options" |
| 265 | |
| 266 | config CMDLINE |
| 267 | string "Built-in kernel command line" |
| 268 | help |
| 269 | For most platforms, the arguments for the kernel's command line |
| 270 | are provided at run-time, during boot. However, there are cases |
| 271 | where either no arguments are being provided or the provided |
| 272 | arguments are insufficient or even invalid. |
| 273 | |
| 274 | When that occurs, it is possible to define a built-in command |
| 275 | line here and choose how the kernel should use it later on. |
| 276 | |
| 277 | choice |
| 278 | prompt "Built-in command line usage" if CMDLINE != "" |
| 279 | default CMDLINE_FALLBACK |
| 280 | help |
| 281 | Choose how the kernel will handle the provided built-in command |
| 282 | line. |
| 283 | |
| 284 | config CMDLINE_FALLBACK |
| 285 | bool "Use bootloader kernel arguments if available" |
| 286 | help |
| 287 | Use the built-in command line as fallback in case we get nothing |
| 288 | during boot. This is the default behaviour. |
| 289 | |
| 290 | config CMDLINE_EXTEND |
| 291 | bool "Extend bootloader kernel arguments" |
| 292 | help |
| 293 | The command-line arguments provided during boot will be |
| 294 | appended to the built-in command line. This is useful in |
| 295 | cases where the provided arguments are insufficient and |
| 296 | you don't want to or cannot modify them. |
| 297 | |
| 298 | |
| 299 | config CMDLINE_FORCE |
| 300 | bool "Always use the default kernel command string" |
| 301 | help |
| 302 | Always use the built-in command line, even if we get one during |
| 303 | boot. This is useful in case you need to override the provided |
| 304 | command line on systems where you don't have or want control |
| 305 | over it. |
| 306 | |
| 307 | endchoice |
| 308 | |
| 309 | endmenu |
| 310 | |
| 311 | menu "Power management options" |
| 312 | |
| 313 | source "kernel/power/Kconfig" |
| 314 | |
| 315 | endmenu |