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 7config 64BIT 8 bool 9 10config 32BIT 11 bool 12 13config 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 62config MMU 63 def_bool y 64 65config ZONE_DMA32 66 bool 67 default y if 64BIT 68 69config VA_BITS 70 int 71 default 32 if 32BIT 72 default 39 if 64BIT 73 74config PA_BITS 75 int 76 default 34 if 32BIT 77 default 56 if 64BIT 78 79config 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 85config ARCH_FLATMEM_ENABLE 86 def_bool y 87 88config ARCH_SPARSEMEM_ENABLE 89 def_bool y 90 select SPARSEMEM_VMEMMAP_ENABLE 91 92config ARCH_SELECT_MEMORY_MODEL 93 def_bool ARCH_SPARSEMEM_ENABLE 94 95config ARCH_WANT_GENERAL_HUGETLB 96 def_bool y 97 98config SYS_SUPPORTS_HUGETLBFS 99 def_bool y 100 101config STACKTRACE_SUPPORT 102 def_bool y 103 104config TRACE_IRQFLAGS_SUPPORT 105 def_bool y 106 107config GENERIC_BUG 108 def_bool y 109 depends on BUG 110 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT 111 112config GENERIC_BUG_RELATIVE_POINTERS 113 bool 114 115config GENERIC_CALIBRATE_DELAY 116 def_bool y 117 118config GENERIC_CSUM 119 def_bool y 120 121config GENERIC_HWEIGHT 122 def_bool y 123 124config FIX_EARLYCON_MEM 125 def_bool y 126 127config PGTABLE_LEVELS 128 int 129 default 3 if 64BIT 130 default 2 131 132source "arch/riscv/Kconfig.socs" 133 134menu "Platform type" 135 136choice 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 143config 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 151config 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 162endchoice 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. 167choice 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" 176endchoice 177 178config MODULE_SECTIONS 179 bool 180 select HAVE_MOD_ARCH_SPECIFIC 181 182choice 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" 193endchoice 194 195 196config 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 209config NR_CPUS 210 int "Maximum number of CPUs (2-32)" 211 range 2 32 212 depends on SMP 213 default "8" 214 215choice 216 prompt "CPU Tuning" 217 default TUNE_GENERIC 218 219config TUNE_GENERIC 220 bool "generic" 221 222endchoice 223 224config 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 234menu "supported PMU type" 235 depends on PERF_EVENTS 236 237config 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 245endmenu 246 247config 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 256endmenu 257 258menu "Kernel features" 259 260source "kernel/Kconfig.hz" 261 262endmenu 263 264menu "Boot options" 265 266config 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 277choice 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 284config 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 290config 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 299config 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 307endchoice 308 309endmenu 310 311menu "Power management options" 312 313source "kernel/power/Kconfig" 314 315endmenu 316