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