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_STACKWALK 19 select ARCH_HAS_BINFMT_FLAT 20 select ARCH_HAS_DEBUG_VM_PGTABLE 21 select ARCH_HAS_DEBUG_VIRTUAL if MMU 22 select ARCH_HAS_DEBUG_WX 23 select ARCH_HAS_GCOV_PROFILE_ALL 24 select ARCH_HAS_GIGANTIC_PAGE 25 select ARCH_HAS_KCOV 26 select ARCH_HAS_MMIOWB 27 select ARCH_HAS_PTE_SPECIAL 28 select ARCH_HAS_SET_DIRECT_MAP 29 select ARCH_HAS_SET_MEMORY 30 select ARCH_HAS_STRICT_KERNEL_RWX if MMU 31 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX 32 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT 33 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU 34 select ARCH_WANT_FRAME_POINTERS 35 select ARCH_WANT_HUGE_PMD_SHARE if 64BIT 36 select CLONE_BACKWARDS 37 select CLINT_TIMER if !MMU 38 select COMMON_CLK 39 select EDAC_SUPPORT 40 select GENERIC_ARCH_TOPOLOGY if SMP 41 select GENERIC_ATOMIC64 if !64BIT 42 select GENERIC_EARLY_IOREMAP 43 select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO 44 select GENERIC_IOREMAP 45 select GENERIC_IRQ_MULTI_HANDLER 46 select GENERIC_IRQ_SHOW 47 select GENERIC_LIB_DEVMEM_IS_ALLOWED 48 select GENERIC_PCI_IOMAP 49 select GENERIC_PTDUMP if MMU 50 select GENERIC_SCHED_CLOCK 51 select GENERIC_SMP_IDLE_THREAD 52 select GENERIC_STRNCPY_FROM_USER if MMU 53 select GENERIC_STRNLEN_USER if MMU 54 select GENERIC_TIME_VSYSCALL if MMU && 64BIT 55 select HANDLE_DOMAIN_IRQ 56 select HAVE_ARCH_AUDITSYSCALL 57 select HAVE_ARCH_JUMP_LABEL 58 select HAVE_ARCH_JUMP_LABEL_RELATIVE 59 select HAVE_ARCH_KASAN if MMU && 64BIT 60 select HAVE_ARCH_KASAN_VMALLOC if MMU && 64BIT 61 select HAVE_ARCH_KGDB 62 select HAVE_ARCH_KGDB_QXFER_PKT 63 select HAVE_ARCH_MMAP_RND_BITS if MMU 64 select HAVE_ARCH_SECCOMP_FILTER 65 select HAVE_ARCH_TRACEHOOK 66 select HAVE_ASM_MODVERSIONS 67 select HAVE_CONTEXT_TRACKING 68 select HAVE_DEBUG_KMEMLEAK 69 select HAVE_DMA_CONTIGUOUS if MMU 70 select HAVE_EBPF_JIT if MMU 71 select HAVE_FUNCTION_ERROR_INJECTION 72 select HAVE_FUTEX_CMPXCHG if FUTEX 73 select HAVE_GCC_PLUGINS 74 select HAVE_GENERIC_VDSO if MMU && 64BIT 75 select HAVE_IRQ_TIME_ACCOUNTING 76 select HAVE_KPROBES 77 select HAVE_KPROBES_ON_FTRACE 78 select HAVE_KRETPROBES 79 select HAVE_PCI 80 select HAVE_PERF_EVENTS 81 select HAVE_PERF_REGS 82 select HAVE_PERF_USER_STACK_DUMP 83 select HAVE_REGS_AND_STACK_ACCESS_API 84 select HAVE_STACKPROTECTOR 85 select HAVE_SYSCALL_TRACEPOINTS 86 select IRQ_DOMAIN 87 select MODULES_USE_ELF_RELA if MODULES 88 select MODULE_SECTIONS if MODULES 89 select OF 90 select OF_EARLY_FLATTREE 91 select OF_IRQ 92 select PCI_DOMAINS_GENERIC if PCI 93 select PCI_MSI if PCI 94 select RISCV_INTC 95 select RISCV_TIMER if RISCV_SBI 96 select SPARSE_IRQ 97 select SYSCTL_EXCEPTION_TRACE 98 select THREAD_INFO_IN_TASK 99 select UACCESS_MEMCPY if !MMU 100 101config ARCH_MMAP_RND_BITS_MIN 102 default 18 if 64BIT 103 default 8 104 105# max bits determined by the following formula: 106# VA_BITS - PAGE_SHIFT - 3 107config ARCH_MMAP_RND_BITS_MAX 108 default 24 if 64BIT # SV39 based 109 default 17 110 111# set if we run in machine mode, cleared if we run in supervisor mode 112config RISCV_M_MODE 113 bool 114 default !MMU 115 116# set if we are running in S-mode and can use SBI calls 117config RISCV_SBI 118 bool 119 depends on !RISCV_M_MODE 120 default y 121 122config MMU 123 bool "MMU-based Paged Memory Management Support" 124 default y 125 help 126 Select if you want MMU-based virtualised addressing space 127 support by paged memory management. If unsure, say 'Y'. 128 129config ZONE_DMA32 130 bool 131 default y if 64BIT 132 133config VA_BITS 134 int 135 default 32 if 32BIT 136 default 39 if 64BIT 137 138config PA_BITS 139 int 140 default 34 if 32BIT 141 default 56 if 64BIT 142 143config PAGE_OFFSET 144 hex 145 default 0xC0000000 if 32BIT && MAXPHYSMEM_1GB 146 default 0x80000000 if 64BIT && !MMU 147 default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB 148 default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB 149 150config ARCH_FLATMEM_ENABLE 151 def_bool !NUMA 152 153config ARCH_SPARSEMEM_ENABLE 154 def_bool y 155 depends on MMU 156 select SPARSEMEM_STATIC if 32BIT && SPARSEMEM 157 select SPARSEMEM_VMEMMAP_ENABLE if 64BIT 158 159config ARCH_SELECT_MEMORY_MODEL 160 def_bool ARCH_SPARSEMEM_ENABLE 161 162config ARCH_WANT_GENERAL_HUGETLB 163 def_bool y 164 165config ARCH_SUPPORTS_UPROBES 166 def_bool y 167 168config SYS_SUPPORTS_HUGETLBFS 169 depends on MMU 170 def_bool y 171 172config STACKTRACE_SUPPORT 173 def_bool y 174 175config TRACE_IRQFLAGS_SUPPORT 176 def_bool y 177 178config GENERIC_BUG 179 def_bool y 180 depends on BUG 181 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT 182 183config GENERIC_BUG_RELATIVE_POINTERS 184 bool 185 186config GENERIC_CALIBRATE_DELAY 187 def_bool y 188 189config GENERIC_CSUM 190 def_bool y 191 192config GENERIC_HWEIGHT 193 def_bool y 194 195config FIX_EARLYCON_MEM 196 def_bool MMU 197 198config PGTABLE_LEVELS 199 int 200 default 3 if 64BIT 201 default 2 202 203config LOCKDEP_SUPPORT 204 def_bool y 205 206source "arch/riscv/Kconfig.socs" 207 208menu "Platform type" 209 210choice 211 prompt "Base ISA" 212 default ARCH_RV64I 213 help 214 This selects the base ISA that this kernel will target and must match 215 the target platform. 216 217config ARCH_RV32I 218 bool "RV32I" 219 select 32BIT 220 select GENERIC_LIB_ASHLDI3 221 select GENERIC_LIB_ASHRDI3 222 select GENERIC_LIB_LSHRDI3 223 select GENERIC_LIB_UCMPDI2 224 select MMU 225 226config ARCH_RV64I 227 bool "RV64I" 228 select 64BIT 229 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && GCC_VERSION >= 50000 230 select HAVE_DYNAMIC_FTRACE if MMU 231 select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE 232 select HAVE_FTRACE_MCOUNT_RECORD 233 select HAVE_FUNCTION_GRAPH_TRACER 234 select HAVE_FUNCTION_TRACER 235 select SWIOTLB if MMU 236 237endchoice 238 239# We must be able to map all physical memory into the kernel, but the compiler 240# is still a bit more efficient when generating code if it's setup in a manner 241# such that it can only map 2GiB of memory. 242choice 243 prompt "Kernel Code Model" 244 default CMODEL_MEDLOW if 32BIT 245 default CMODEL_MEDANY if 64BIT 246 247 config CMODEL_MEDLOW 248 bool "medium low code model" 249 config CMODEL_MEDANY 250 bool "medium any code model" 251endchoice 252 253config MODULE_SECTIONS 254 bool 255 select HAVE_MOD_ARCH_SPECIFIC 256 257choice 258 prompt "Maximum Physical Memory" 259 default MAXPHYSMEM_1GB if 32BIT 260 default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW 261 default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY 262 263 config MAXPHYSMEM_1GB 264 depends on 32BIT 265 bool "1GiB" 266 config MAXPHYSMEM_2GB 267 depends on 64BIT && CMODEL_MEDLOW 268 bool "2GiB" 269 config MAXPHYSMEM_128GB 270 depends on 64BIT && CMODEL_MEDANY 271 bool "128GiB" 272endchoice 273 274 275config SMP 276 bool "Symmetric Multi-Processing" 277 help 278 This enables support for systems with more than one CPU. If 279 you say N here, the kernel will run on single and 280 multiprocessor machines, but will use only one CPU of a 281 multiprocessor machine. If you say Y here, the kernel will run 282 on many, but not all, single processor machines. On a single 283 processor machine, the kernel will run faster if you say N 284 here. 285 286 If you don't know what to do here, say N. 287 288config NR_CPUS 289 int "Maximum number of CPUs (2-32)" 290 range 2 32 291 depends on SMP 292 default "8" 293 294config HOTPLUG_CPU 295 bool "Support for hot-pluggable CPUs" 296 depends on SMP 297 select GENERIC_IRQ_MIGRATION 298 help 299 300 Say Y here to experiment with turning CPUs off and on. CPUs 301 can be controlled through /sys/devices/system/cpu. 302 303 Say N if you want to disable CPU hotplug. 304 305choice 306 prompt "CPU Tuning" 307 default TUNE_GENERIC 308 309config TUNE_GENERIC 310 bool "generic" 311 312endchoice 313 314# Common NUMA Features 315config NUMA 316 bool "NUMA Memory Allocation and Scheduler Support" 317 depends on SMP && MMU 318 select GENERIC_ARCH_NUMA 319 select OF_NUMA 320 select ARCH_SUPPORTS_NUMA_BALANCING 321 help 322 Enable NUMA (Non-Uniform Memory Access) support. 323 324 The kernel will try to allocate memory used by a CPU on the 325 local memory of the CPU and add some more NUMA awareness to the kernel. 326 327config NODES_SHIFT 328 int "Maximum NUMA Nodes (as a power of 2)" 329 range 1 10 330 default "2" 331 depends on NEED_MULTIPLE_NODES 332 help 333 Specify the maximum number of NUMA Nodes available on the target 334 system. Increases memory reserved to accommodate various tables. 335 336config USE_PERCPU_NUMA_NODE_ID 337 def_bool y 338 depends on NUMA 339 340config NEED_PER_CPU_EMBED_FIRST_CHUNK 341 def_bool y 342 depends on NUMA 343 344config RISCV_ISA_C 345 bool "Emit compressed instructions when building Linux" 346 default y 347 help 348 Adds "C" to the ISA subsets that the toolchain is allowed to emit 349 when building Linux, which results in compressed instructions in the 350 Linux binary. 351 352 If you don't know what to do here, say Y. 353 354menu "supported PMU type" 355 depends on PERF_EVENTS 356 357config RISCV_BASE_PMU 358 bool "Base Performance Monitoring Unit" 359 def_bool y 360 help 361 A base PMU that serves as a reference implementation and has limited 362 feature of perf. It can run on any RISC-V machines so serves as the 363 fallback, but this option can also be disable to reduce kernel size. 364 365endmenu 366 367config FPU 368 bool "FPU support" 369 default y 370 help 371 Say N here if you want to disable all floating-point related procedure 372 in the kernel. 373 374 If you don't know what to do here, say Y. 375 376endmenu 377 378menu "Kernel features" 379 380source "kernel/Kconfig.hz" 381 382config RISCV_SBI_V01 383 bool "SBI v0.1 support" 384 default y 385 depends on RISCV_SBI 386 help 387 This config allows kernel to use SBI v0.1 APIs. This will be 388 deprecated in future once legacy M-mode software are no longer in use. 389endmenu 390 391menu "Boot options" 392 393config CMDLINE 394 string "Built-in kernel command line" 395 help 396 For most platforms, the arguments for the kernel's command line 397 are provided at run-time, during boot. However, there are cases 398 where either no arguments are being provided or the provided 399 arguments are insufficient or even invalid. 400 401 When that occurs, it is possible to define a built-in command 402 line here and choose how the kernel should use it later on. 403 404choice 405 prompt "Built-in command line usage" if CMDLINE != "" 406 default CMDLINE_FALLBACK 407 help 408 Choose how the kernel will handle the provided built-in command 409 line. 410 411config CMDLINE_FALLBACK 412 bool "Use bootloader kernel arguments if available" 413 help 414 Use the built-in command line as fallback in case we get nothing 415 during boot. This is the default behaviour. 416 417config CMDLINE_EXTEND 418 bool "Extend bootloader kernel arguments" 419 help 420 The command-line arguments provided during boot will be 421 appended to the built-in command line. This is useful in 422 cases where the provided arguments are insufficient and 423 you don't want to or cannot modify them. 424 425 426config CMDLINE_FORCE 427 bool "Always use the default kernel command string" 428 help 429 Always use the built-in command line, even if we get one during 430 boot. This is useful in case you need to override the provided 431 command line on systems where you don't have or want control 432 over it. 433 434endchoice 435 436config EFI_STUB 437 bool 438 439config EFI 440 bool "UEFI runtime support" 441 depends on OF 442 select LIBFDT 443 select UCS2_STRING 444 select EFI_PARAMS_FROM_FDT 445 select EFI_STUB 446 select EFI_GENERIC_STUB 447 select EFI_RUNTIME_WRAPPERS 448 select RISCV_ISA_C 449 depends on MMU 450 default y 451 help 452 This option provides support for runtime services provided 453 by UEFI firmware (such as non-volatile variables, realtime 454 clock, and platform reset). A UEFI stub is also provided to 455 allow the kernel to be booted as an EFI application. This 456 is only useful on systems that have UEFI firmware. 457 458config CC_HAVE_STACKPROTECTOR_TLS 459 def_bool $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=tp -mstack-protector-guard-offset=0) 460 461config STACKPROTECTOR_PER_TASK 462 def_bool y 463 depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS 464 465endmenu 466 467config BUILTIN_DTB 468 def_bool n 469 depends on OF 470 471menu "Power management options" 472 473source "kernel/power/Kconfig" 474 475endmenu 476 477source "drivers/firmware/Kconfig" 478