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 select ARCH_CLOCKSOURCE_INIT 16 select ARCH_SUPPORTS_ATOMIC_RMW 17 select ARCH_HAS_BINFMT_FLAT 18 select ARCH_HAS_DEBUG_VM_PGTABLE 19 select ARCH_HAS_DEBUG_VIRTUAL if MMU 20 select ARCH_HAS_DEBUG_WX 21 select ARCH_HAS_GCOV_PROFILE_ALL 22 select ARCH_HAS_GIGANTIC_PAGE 23 select ARCH_HAS_KCOV 24 select ARCH_HAS_MMIOWB 25 select ARCH_HAS_PTE_SPECIAL 26 select ARCH_HAS_SET_DIRECT_MAP 27 select ARCH_HAS_SET_MEMORY 28 select ARCH_HAS_STRICT_KERNEL_RWX if MMU 29 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX 30 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT 31 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU 32 select ARCH_WANT_FRAME_POINTERS 33 select ARCH_WANT_HUGE_PMD_SHARE if 64BIT 34 select CLONE_BACKWARDS 35 select CLINT_TIMER if !MMU 36 select COMMON_CLK 37 select EDAC_SUPPORT 38 select GENERIC_ARCH_TOPOLOGY if SMP 39 select GENERIC_ATOMIC64 if !64BIT 40 select GENERIC_CLOCKEVENTS 41 select GENERIC_EARLY_IOREMAP 42 select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO 43 select GENERIC_IOREMAP 44 select GENERIC_IRQ_MULTI_HANDLER 45 select GENERIC_IRQ_SHOW 46 select GENERIC_PCI_IOMAP 47 select GENERIC_PTDUMP if MMU 48 select GENERIC_SCHED_CLOCK 49 select GENERIC_SMP_IDLE_THREAD 50 select GENERIC_STRNCPY_FROM_USER if MMU 51 select GENERIC_STRNLEN_USER if MMU 52 select GENERIC_TIME_VSYSCALL if MMU && 64BIT 53 select HANDLE_DOMAIN_IRQ 54 select HAVE_ARCH_AUDITSYSCALL 55 select HAVE_ARCH_JUMP_LABEL 56 select HAVE_ARCH_JUMP_LABEL_RELATIVE 57 select HAVE_ARCH_KASAN if MMU && 64BIT 58 select HAVE_ARCH_KGDB 59 select HAVE_ARCH_KGDB_QXFER_PKT 60 select HAVE_ARCH_MMAP_RND_BITS if MMU 61 select HAVE_ARCH_SECCOMP_FILTER 62 select HAVE_ARCH_TRACEHOOK 63 select HAVE_ASM_MODVERSIONS 64 select HAVE_CONTEXT_TRACKING 65 select HAVE_DEBUG_KMEMLEAK 66 select HAVE_DMA_CONTIGUOUS if MMU 67 select HAVE_EBPF_JIT if MMU 68 select HAVE_FUTEX_CMPXCHG if FUTEX 69 select HAVE_GCC_PLUGINS 70 select HAVE_GENERIC_VDSO if MMU && 64BIT 71 select HAVE_PCI 72 select HAVE_PERF_EVENTS 73 select HAVE_PERF_REGS 74 select HAVE_PERF_USER_STACK_DUMP 75 select HAVE_STACKPROTECTOR 76 select HAVE_SYSCALL_TRACEPOINTS 77 select IRQ_DOMAIN 78 select MODULES_USE_ELF_RELA if MODULES 79 select MODULE_SECTIONS if MODULES 80 select OF 81 select OF_EARLY_FLATTREE 82 select OF_IRQ 83 select PCI_DOMAINS_GENERIC if PCI 84 select PCI_MSI if PCI 85 select RISCV_INTC 86 select RISCV_TIMER if RISCV_SBI 87 select SPARSE_IRQ 88 select SYSCTL_EXCEPTION_TRACE 89 select THREAD_INFO_IN_TASK 90 select UACCESS_MEMCPY if !MMU 91 92config ARCH_MMAP_RND_BITS_MIN 93 default 18 if 64BIT 94 default 8 95 96# max bits determined by the following formula: 97# VA_BITS - PAGE_SHIFT - 3 98config ARCH_MMAP_RND_BITS_MAX 99 default 24 if 64BIT # SV39 based 100 default 17 101 102# set if we run in machine mode, cleared if we run in supervisor mode 103config RISCV_M_MODE 104 bool 105 default !MMU 106 107# set if we are running in S-mode and can use SBI calls 108config RISCV_SBI 109 bool 110 depends on !RISCV_M_MODE 111 default y 112 113config MMU 114 bool "MMU-based Paged Memory Management Support" 115 default y 116 help 117 Select if you want MMU-based virtualised addressing space 118 support by paged memory management. If unsure, say 'Y'. 119 120config ZONE_DMA32 121 bool 122 default y if 64BIT 123 124config VA_BITS 125 int 126 default 32 if 32BIT 127 default 39 if 64BIT 128 129config PA_BITS 130 int 131 default 34 if 32BIT 132 default 56 if 64BIT 133 134config PAGE_OFFSET 135 hex 136 default 0xC0000000 if 32BIT && MAXPHYSMEM_1GB 137 default 0x80000000 if 64BIT && !MMU 138 default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB 139 default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB 140 141config KASAN_SHADOW_OFFSET 142 hex 143 depends on KASAN_GENERIC 144 default 0xdfffffc800000000 if 64BIT 145 default 0xffffffff if 32BIT 146 147config ARCH_FLATMEM_ENABLE 148 def_bool y 149 150config ARCH_SPARSEMEM_ENABLE 151 def_bool y 152 depends on MMU 153 select SPARSEMEM_STATIC if 32BIT && SPARSEMEM 154 select SPARSEMEM_VMEMMAP_ENABLE if 64BIT 155 156config ARCH_SELECT_MEMORY_MODEL 157 def_bool ARCH_SPARSEMEM_ENABLE 158 159config ARCH_WANT_GENERAL_HUGETLB 160 def_bool y 161 162config ARCH_SUPPORTS_DEBUG_PAGEALLOC 163 def_bool y 164 165config SYS_SUPPORTS_HUGETLBFS 166 depends on MMU 167 def_bool y 168 169config STACKTRACE_SUPPORT 170 def_bool y 171 172config TRACE_IRQFLAGS_SUPPORT 173 def_bool y 174 175config GENERIC_BUG 176 def_bool y 177 depends on BUG 178 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT 179 180config GENERIC_BUG_RELATIVE_POINTERS 181 bool 182 183config GENERIC_CALIBRATE_DELAY 184 def_bool y 185 186config GENERIC_CSUM 187 def_bool y 188 189config GENERIC_HWEIGHT 190 def_bool y 191 192config FIX_EARLYCON_MEM 193 def_bool MMU 194 195config PGTABLE_LEVELS 196 int 197 default 3 if 64BIT 198 default 2 199 200config LOCKDEP_SUPPORT 201 def_bool y 202 203source "arch/riscv/Kconfig.socs" 204 205menu "Platform type" 206 207choice 208 prompt "Base ISA" 209 default ARCH_RV64I 210 help 211 This selects the base ISA that this kernel will target and must match 212 the target platform. 213 214config ARCH_RV32I 215 bool "RV32I" 216 select 32BIT 217 select GENERIC_LIB_ASHLDI3 218 select GENERIC_LIB_ASHRDI3 219 select GENERIC_LIB_LSHRDI3 220 select GENERIC_LIB_UCMPDI2 221 select MMU 222 223config ARCH_RV64I 224 bool "RV64I" 225 select 64BIT 226 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && GCC_VERSION >= 50000 227 select HAVE_DYNAMIC_FTRACE if MMU 228 select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE 229 select HAVE_FTRACE_MCOUNT_RECORD 230 select HAVE_FUNCTION_GRAPH_TRACER 231 select HAVE_FUNCTION_TRACER 232 select SWIOTLB if MMU 233 234endchoice 235 236# We must be able to map all physical memory into the kernel, but the compiler 237# is still a bit more efficient when generating code if it's setup in a manner 238# such that it can only map 2GiB of memory. 239choice 240 prompt "Kernel Code Model" 241 default CMODEL_MEDLOW if 32BIT 242 default CMODEL_MEDANY if 64BIT 243 244 config CMODEL_MEDLOW 245 bool "medium low code model" 246 config CMODEL_MEDANY 247 bool "medium any code model" 248endchoice 249 250config MODULE_SECTIONS 251 bool 252 select HAVE_MOD_ARCH_SPECIFIC 253 254choice 255 prompt "Maximum Physical Memory" 256 default MAXPHYSMEM_1GB if 32BIT 257 default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW 258 default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY 259 260 config MAXPHYSMEM_1GB 261 depends on 32BIT 262 bool "1GiB" 263 config MAXPHYSMEM_2GB 264 depends on 64BIT && CMODEL_MEDLOW 265 bool "2GiB" 266 config MAXPHYSMEM_128GB 267 depends on 64BIT && CMODEL_MEDANY 268 bool "128GiB" 269endchoice 270 271 272config SMP 273 bool "Symmetric Multi-Processing" 274 help 275 This enables support for systems with more than one CPU. If 276 you say N here, the kernel will run on single and 277 multiprocessor machines, but will use only one CPU of a 278 multiprocessor machine. If you say Y here, the kernel will run 279 on many, but not all, single processor machines. On a single 280 processor machine, the kernel will run faster if you say N 281 here. 282 283 If you don't know what to do here, say N. 284 285config NR_CPUS 286 int "Maximum number of CPUs (2-32)" 287 range 2 32 288 depends on SMP 289 default "8" 290 291config HOTPLUG_CPU 292 bool "Support for hot-pluggable CPUs" 293 depends on SMP 294 select GENERIC_IRQ_MIGRATION 295 help 296 297 Say Y here to experiment with turning CPUs off and on. CPUs 298 can be controlled through /sys/devices/system/cpu. 299 300 Say N if you want to disable CPU hotplug. 301 302choice 303 prompt "CPU Tuning" 304 default TUNE_GENERIC 305 306config TUNE_GENERIC 307 bool "generic" 308 309endchoice 310 311config RISCV_ISA_C 312 bool "Emit compressed instructions when building Linux" 313 default y 314 help 315 Adds "C" to the ISA subsets that the toolchain is allowed to emit 316 when building Linux, which results in compressed instructions in the 317 Linux binary. 318 319 If you don't know what to do here, say Y. 320 321menu "supported PMU type" 322 depends on PERF_EVENTS 323 324config RISCV_BASE_PMU 325 bool "Base Performance Monitoring Unit" 326 def_bool y 327 help 328 A base PMU that serves as a reference implementation and has limited 329 feature of perf. It can run on any RISC-V machines so serves as the 330 fallback, but this option can also be disable to reduce kernel size. 331 332endmenu 333 334config FPU 335 bool "FPU support" 336 default y 337 help 338 Say N here if you want to disable all floating-point related procedure 339 in the kernel. 340 341 If you don't know what to do here, say Y. 342 343endmenu 344 345menu "Kernel features" 346 347source "kernel/Kconfig.hz" 348 349config RISCV_SBI_V01 350 bool "SBI v0.1 support" 351 default y 352 depends on RISCV_SBI 353 help 354 This config allows kernel to use SBI v0.1 APIs. This will be 355 deprecated in future once legacy M-mode software are no longer in use. 356endmenu 357 358menu "Boot options" 359 360config CMDLINE 361 string "Built-in kernel command line" 362 help 363 For most platforms, the arguments for the kernel's command line 364 are provided at run-time, during boot. However, there are cases 365 where either no arguments are being provided or the provided 366 arguments are insufficient or even invalid. 367 368 When that occurs, it is possible to define a built-in command 369 line here and choose how the kernel should use it later on. 370 371choice 372 prompt "Built-in command line usage" if CMDLINE != "" 373 default CMDLINE_FALLBACK 374 help 375 Choose how the kernel will handle the provided built-in command 376 line. 377 378config CMDLINE_FALLBACK 379 bool "Use bootloader kernel arguments if available" 380 help 381 Use the built-in command line as fallback in case we get nothing 382 during boot. This is the default behaviour. 383 384config CMDLINE_EXTEND 385 bool "Extend bootloader kernel arguments" 386 help 387 The command-line arguments provided during boot will be 388 appended to the built-in command line. This is useful in 389 cases where the provided arguments are insufficient and 390 you don't want to or cannot modify them. 391 392 393config CMDLINE_FORCE 394 bool "Always use the default kernel command string" 395 help 396 Always use the built-in command line, even if we get one during 397 boot. This is useful in case you need to override the provided 398 command line on systems where you don't have or want control 399 over it. 400 401endchoice 402 403config EFI_STUB 404 bool 405 406config EFI 407 bool "UEFI runtime support" 408 depends on OF 409 select LIBFDT 410 select UCS2_STRING 411 select EFI_PARAMS_FROM_FDT 412 select EFI_STUB 413 select EFI_GENERIC_STUB 414 select EFI_RUNTIME_WRAPPERS 415 select RISCV_ISA_C 416 depends on MMU 417 default y 418 help 419 This option provides support for runtime services provided 420 by UEFI firmware (such as non-volatile variables, realtime 421 clock, and platform reset). A UEFI stub is also provided to 422 allow the kernel to be booted as an EFI application. This 423 is only useful on systems that have UEFI firmware. 424 425endmenu 426 427config BUILTIN_DTB 428 def_bool n 429 depends on RISCV_M_MODE 430 depends on OF 431 432menu "Power management options" 433 434source "kernel/power/Kconfig" 435 436endmenu 437 438source "drivers/firmware/Kconfig" 439