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_ASM_MODVERSIONS 35 select HAVE_MEMBLOCK_NODE_MAP 36 select HAVE_DMA_CONTIGUOUS 37 select HAVE_FUTEX_CMPXCHG if FUTEX 38 select HAVE_PERF_EVENTS 39 select HAVE_PERF_REGS 40 select HAVE_PERF_USER_STACK_DUMP 41 select HAVE_SYSCALL_TRACEPOINTS 42 select IRQ_DOMAIN 43 select SPARSE_IRQ 44 select SYSCTL_EXCEPTION_TRACE 45 select HAVE_ARCH_TRACEHOOK 46 select HAVE_PCI 47 select MODULES_USE_ELF_RELA if MODULES 48 select MODULE_SECTIONS if MODULES 49 select THREAD_INFO_IN_TASK 50 select PCI_DOMAINS_GENERIC if PCI 51 select PCI_MSI if PCI 52 select RISCV_TIMER 53 select GENERIC_IRQ_MULTI_HANDLER 54 select GENERIC_ARCH_TOPOLOGY if SMP 55 select ARCH_HAS_PTE_SPECIAL 56 select ARCH_HAS_MMIOWB 57 select HAVE_EBPF_JIT if 64BIT 58 select EDAC_SUPPORT 59 select ARCH_HAS_GIGANTIC_PAGE 60 select ARCH_WANT_HUGE_PMD_SHARE if 64BIT 61 select SPARSEMEM_STATIC if 32BIT 62 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU 63 select HAVE_ARCH_MMAP_RND_BITS 64 65config ARCH_MMAP_RND_BITS_MIN 66 default 18 if 64BIT 67 default 8 68 69# max bits determined by the following formula: 70# VA_BITS - PAGE_SHIFT - 3 71config ARCH_MMAP_RND_BITS_MAX 72 default 24 if 64BIT # SV39 based 73 default 17 74 75config MMU 76 def_bool y 77 78config ZONE_DMA32 79 bool 80 default y if 64BIT 81 82config VA_BITS 83 int 84 default 32 if 32BIT 85 default 39 if 64BIT 86 87config PA_BITS 88 int 89 default 34 if 32BIT 90 default 56 if 64BIT 91 92config PAGE_OFFSET 93 hex 94 default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB 95 default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB 96 default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB 97 98config ARCH_FLATMEM_ENABLE 99 def_bool y 100 101config ARCH_SPARSEMEM_ENABLE 102 def_bool y 103 select SPARSEMEM_VMEMMAP_ENABLE 104 105config ARCH_SELECT_MEMORY_MODEL 106 def_bool ARCH_SPARSEMEM_ENABLE 107 108config ARCH_WANT_GENERAL_HUGETLB 109 def_bool y 110 111config SYS_SUPPORTS_HUGETLBFS 112 def_bool y 113 114config STACKTRACE_SUPPORT 115 def_bool y 116 117config TRACE_IRQFLAGS_SUPPORT 118 def_bool y 119 120config GENERIC_BUG 121 def_bool y 122 depends on BUG 123 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT 124 125config GENERIC_BUG_RELATIVE_POINTERS 126 bool 127 128config GENERIC_CALIBRATE_DELAY 129 def_bool y 130 131config GENERIC_CSUM 132 def_bool y 133 134config GENERIC_HWEIGHT 135 def_bool y 136 137config FIX_EARLYCON_MEM 138 def_bool y 139 140config PGTABLE_LEVELS 141 int 142 default 3 if 64BIT 143 default 2 144 145source "arch/riscv/Kconfig.socs" 146 147menu "Platform type" 148 149choice 150 prompt "Base ISA" 151 default ARCH_RV64I 152 help 153 This selects the base ISA that this kernel will target and must match 154 the target platform. 155 156config ARCH_RV32I 157 bool "RV32I" 158 select 32BIT 159 select GENERIC_LIB_ASHLDI3 160 select GENERIC_LIB_ASHRDI3 161 select GENERIC_LIB_LSHRDI3 162 select GENERIC_LIB_UCMPDI2 163 164config ARCH_RV64I 165 bool "RV64I" 166 select 64BIT 167 select ARCH_SUPPORTS_INT128 if GCC_VERSION >= 50000 168 select HAVE_FUNCTION_TRACER 169 select HAVE_FUNCTION_GRAPH_TRACER 170 select HAVE_FTRACE_MCOUNT_RECORD 171 select HAVE_DYNAMIC_FTRACE 172 select HAVE_DYNAMIC_FTRACE_WITH_REGS 173 select SWIOTLB 174 175endchoice 176 177# We must be able to map all physical memory into the kernel, but the compiler 178# is still a bit more efficient when generating code if it's setup in a manner 179# such that it can only map 2GiB of memory. 180choice 181 prompt "Kernel Code Model" 182 default CMODEL_MEDLOW if 32BIT 183 default CMODEL_MEDANY if 64BIT 184 185 config CMODEL_MEDLOW 186 bool "medium low code model" 187 config CMODEL_MEDANY 188 bool "medium any code model" 189endchoice 190 191config MODULE_SECTIONS 192 bool 193 select HAVE_MOD_ARCH_SPECIFIC 194 195choice 196 prompt "Maximum Physical Memory" 197 default MAXPHYSMEM_2GB if 32BIT 198 default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW 199 default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY 200 201 config MAXPHYSMEM_2GB 202 bool "2GiB" 203 config MAXPHYSMEM_128GB 204 depends on 64BIT && CMODEL_MEDANY 205 bool "128GiB" 206endchoice 207 208 209config SMP 210 bool "Symmetric Multi-Processing" 211 help 212 This enables support for systems with more than one CPU. If 213 you say N here, the kernel will run on single and 214 multiprocessor machines, but will use only one CPU of a 215 multiprocessor machine. If you say Y here, the kernel will run 216 on many, but not all, single processor machines. On a single 217 processor machine, the kernel will run faster if you say N 218 here. 219 220 If you don't know what to do here, say N. 221 222config NR_CPUS 223 int "Maximum number of CPUs (2-32)" 224 range 2 32 225 depends on SMP 226 default "8" 227 228choice 229 prompt "CPU Tuning" 230 default TUNE_GENERIC 231 232config TUNE_GENERIC 233 bool "generic" 234 235endchoice 236 237config RISCV_ISA_C 238 bool "Emit compressed instructions when building Linux" 239 default y 240 help 241 Adds "C" to the ISA subsets that the toolchain is allowed to emit 242 when building Linux, which results in compressed instructions in the 243 Linux binary. 244 245 If you don't know what to do here, say Y. 246 247menu "supported PMU type" 248 depends on PERF_EVENTS 249 250config RISCV_BASE_PMU 251 bool "Base Performance Monitoring Unit" 252 def_bool y 253 help 254 A base PMU that serves as a reference implementation and has limited 255 feature of perf. It can run on any RISC-V machines so serves as the 256 fallback, but this option can also be disable to reduce kernel size. 257 258endmenu 259 260config FPU 261 bool "FPU support" 262 default y 263 help 264 Say N here if you want to disable all floating-point related procedure 265 in the kernel. 266 267 If you don't know what to do here, say Y. 268 269endmenu 270 271menu "Kernel features" 272 273source "kernel/Kconfig.hz" 274 275endmenu 276 277menu "Boot options" 278 279config CMDLINE 280 string "Built-in kernel command line" 281 help 282 For most platforms, the arguments for the kernel's command line 283 are provided at run-time, during boot. However, there are cases 284 where either no arguments are being provided or the provided 285 arguments are insufficient or even invalid. 286 287 When that occurs, it is possible to define a built-in command 288 line here and choose how the kernel should use it later on. 289 290choice 291 prompt "Built-in command line usage" if CMDLINE != "" 292 default CMDLINE_FALLBACK 293 help 294 Choose how the kernel will handle the provided built-in command 295 line. 296 297config CMDLINE_FALLBACK 298 bool "Use bootloader kernel arguments if available" 299 help 300 Use the built-in command line as fallback in case we get nothing 301 during boot. This is the default behaviour. 302 303config CMDLINE_EXTEND 304 bool "Extend bootloader kernel arguments" 305 help 306 The command-line arguments provided during boot will be 307 appended to the built-in command line. This is useful in 308 cases where the provided arguments are insufficient and 309 you don't want to or cannot modify them. 310 311 312config CMDLINE_FORCE 313 bool "Always use the default kernel command string" 314 help 315 Always use the built-in command line, even if we get one during 316 boot. This is useful in case you need to override the provided 317 command line on systems where you don't have or want control 318 over it. 319 320endchoice 321 322endmenu 323 324menu "Power management options" 325 326source "kernel/power/Kconfig" 327 328endmenu 329