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_ENABLE_HUGEPAGE_MIGRATION if HUGETLB_PAGE && MIGRATION 17 select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2 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_FORTIFY_SOURCE 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 if MMU 29 select ARCH_HAS_SET_MEMORY if MMU 30 select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL 31 select ARCH_HAS_STRICT_MODULE_RWX if MMU && !XIP_KERNEL 32 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 33 select ARCH_HAS_UBSAN_SANITIZE_ALL 34 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX 35 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT 36 select ARCH_STACKWALK 37 select ARCH_SUPPORTS_ATOMIC_RMW 38 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if MMU 39 select ARCH_SUPPORTS_HUGETLBFS if MMU 40 select ARCH_USE_MEMTEST 41 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU 42 select ARCH_WANT_FRAME_POINTERS 43 select ARCH_WANT_HUGE_PMD_SHARE if 64BIT 44 select BINFMT_FLAT_NO_DATA_START_OFFSET if !MMU 45 select BUILDTIME_TABLE_SORT if MMU 46 select CLONE_BACKWARDS 47 select CLINT_TIMER if !MMU 48 select COMMON_CLK 49 select EDAC_SUPPORT 50 select GENERIC_ARCH_TOPOLOGY if SMP 51 select GENERIC_ATOMIC64 if !64BIT 52 select GENERIC_CLOCKEVENTS_BROADCAST if SMP 53 select GENERIC_EARLY_IOREMAP 54 select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO 55 select GENERIC_IDLE_POLL_SETUP 56 select GENERIC_IOREMAP if MMU 57 select GENERIC_IRQ_MULTI_HANDLER 58 select GENERIC_IRQ_SHOW 59 select GENERIC_IRQ_SHOW_LEVEL 60 select GENERIC_LIB_DEVMEM_IS_ALLOWED 61 select GENERIC_PCI_IOMAP 62 select GENERIC_PTDUMP if MMU 63 select GENERIC_SCHED_CLOCK 64 select GENERIC_SMP_IDLE_THREAD 65 select GENERIC_TIME_VSYSCALL if MMU && 64BIT 66 select GENERIC_VDSO_TIME_NS if HAVE_GENERIC_VDSO 67 select HAVE_ARCH_AUDITSYSCALL 68 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL 69 select HAVE_ARCH_JUMP_LABEL_RELATIVE if !XIP_KERNEL 70 select HAVE_ARCH_KASAN if MMU && 64BIT 71 select HAVE_ARCH_KASAN_VMALLOC if MMU && 64BIT 72 select HAVE_ARCH_KFENCE if MMU && 64BIT 73 select HAVE_ARCH_KGDB if !XIP_KERNEL 74 select HAVE_ARCH_KGDB_QXFER_PKT 75 select HAVE_ARCH_MMAP_RND_BITS if MMU 76 select HAVE_ARCH_SECCOMP_FILTER 77 select HAVE_ARCH_TRACEHOOK 78 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT && MMU 79 select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE 80 select HAVE_ARCH_THREAD_STRUCT_WHITELIST 81 select HAVE_ARCH_VMAP_STACK if MMU && 64BIT 82 select HAVE_ASM_MODVERSIONS 83 select HAVE_CONTEXT_TRACKING 84 select HAVE_DEBUG_KMEMLEAK 85 select HAVE_DMA_CONTIGUOUS if MMU 86 select HAVE_EBPF_JIT if MMU 87 select HAVE_FUNCTION_ERROR_INJECTION 88 select HAVE_GCC_PLUGINS 89 select HAVE_GENERIC_VDSO if MMU && 64BIT 90 select HAVE_IRQ_TIME_ACCOUNTING 91 select HAVE_KPROBES if !XIP_KERNEL 92 select HAVE_KPROBES_ON_FTRACE if !XIP_KERNEL 93 select HAVE_KRETPROBES if !XIP_KERNEL 94 select HAVE_MOVE_PMD 95 select HAVE_MOVE_PUD 96 select HAVE_PCI 97 select HAVE_PERF_EVENTS 98 select HAVE_PERF_REGS 99 select HAVE_PERF_USER_STACK_DUMP 100 select HAVE_REGS_AND_STACK_ACCESS_API 101 select HAVE_FUNCTION_ARG_ACCESS_API 102 select HAVE_STACKPROTECTOR 103 select HAVE_SYSCALL_TRACEPOINTS 104 select IRQ_DOMAIN 105 select IRQ_FORCED_THREADING 106 select MODULES_USE_ELF_RELA if MODULES 107 select MODULE_SECTIONS if MODULES 108 select OF 109 select OF_EARLY_FLATTREE 110 select OF_IRQ 111 select PCI_DOMAINS_GENERIC if PCI 112 select PCI_MSI if PCI 113 select RISCV_INTC 114 select RISCV_TIMER if RISCV_SBI 115 select SPARSE_IRQ 116 select SYSCTL_EXCEPTION_TRACE 117 select THREAD_INFO_IN_TASK 118 select TRACE_IRQFLAGS_SUPPORT 119 select UACCESS_MEMCPY if !MMU 120 select ZONE_DMA32 if 64BIT 121 122config ARCH_MMAP_RND_BITS_MIN 123 default 18 if 64BIT 124 default 8 125 126# max bits determined by the following formula: 127# VA_BITS - PAGE_SHIFT - 3 128config ARCH_MMAP_RND_BITS_MAX 129 default 24 if 64BIT # SV39 based 130 default 17 131 132# set if we run in machine mode, cleared if we run in supervisor mode 133config RISCV_M_MODE 134 bool 135 default !MMU 136 137# set if we are running in S-mode and can use SBI calls 138config RISCV_SBI 139 bool 140 depends on !RISCV_M_MODE 141 default y 142 143config MMU 144 bool "MMU-based Paged Memory Management Support" 145 default y 146 help 147 Select if you want MMU-based virtualised addressing space 148 support by paged memory management. If unsure, say 'Y'. 149 150config VA_BITS 151 int 152 default 32 if 32BIT 153 default 39 if 64BIT 154 155config PA_BITS 156 int 157 default 34 if 32BIT 158 default 56 if 64BIT 159 160config PAGE_OFFSET 161 hex 162 default 0xC0000000 if 32BIT && MAXPHYSMEM_1GB 163 default 0x80000000 if 64BIT && !MMU 164 default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB 165 default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB 166 167config KASAN_SHADOW_OFFSET 168 hex 169 depends on KASAN_GENERIC 170 default 0xdfffffc800000000 if 64BIT 171 default 0xffffffff if 32BIT 172 173config ARCH_FLATMEM_ENABLE 174 def_bool !NUMA 175 176config ARCH_SPARSEMEM_ENABLE 177 def_bool y 178 depends on MMU 179 select SPARSEMEM_STATIC if 32BIT && SPARSEMEM 180 select SPARSEMEM_VMEMMAP_ENABLE if 64BIT 181 182config ARCH_SELECT_MEMORY_MODEL 183 def_bool ARCH_SPARSEMEM_ENABLE 184 185config ARCH_WANT_GENERAL_HUGETLB 186 def_bool y 187 188config ARCH_SUPPORTS_UPROBES 189 def_bool y 190 191config STACKTRACE_SUPPORT 192 def_bool y 193 194config GENERIC_BUG 195 def_bool y 196 depends on BUG 197 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT 198 199config GENERIC_BUG_RELATIVE_POINTERS 200 bool 201 202config GENERIC_CALIBRATE_DELAY 203 def_bool y 204 205config GENERIC_CSUM 206 def_bool y 207 208config GENERIC_HWEIGHT 209 def_bool y 210 211config FIX_EARLYCON_MEM 212 def_bool MMU 213 214config PGTABLE_LEVELS 215 int 216 default 3 if 64BIT 217 default 2 218 219config LOCKDEP_SUPPORT 220 def_bool y 221 222source "arch/riscv/Kconfig.socs" 223source "arch/riscv/Kconfig.erratas" 224 225menu "Platform type" 226 227choice 228 prompt "Base ISA" 229 default ARCH_RV64I 230 help 231 This selects the base ISA that this kernel will target and must match 232 the target platform. 233 234config ARCH_RV32I 235 bool "RV32I" 236 select 32BIT 237 select GENERIC_LIB_ASHLDI3 238 select GENERIC_LIB_ASHRDI3 239 select GENERIC_LIB_LSHRDI3 240 select GENERIC_LIB_UCMPDI2 241 select MMU 242 243config ARCH_RV64I 244 bool "RV64I" 245 select 64BIT 246 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 247 select HAVE_DYNAMIC_FTRACE if !XIP_KERNEL && MMU && $(cc-option,-fpatchable-function-entry=8) 248 select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE 249 select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL 250 select HAVE_FUNCTION_GRAPH_TRACER 251 select HAVE_FUNCTION_TRACER if !XIP_KERNEL 252 select SWIOTLB if MMU 253 254endchoice 255 256# We must be able to map all physical memory into the kernel, but the compiler 257# is still a bit more efficient when generating code if it's setup in a manner 258# such that it can only map 2GiB of memory. 259choice 260 prompt "Kernel Code Model" 261 default CMODEL_MEDLOW if 32BIT 262 default CMODEL_MEDANY if 64BIT 263 264 config CMODEL_MEDLOW 265 bool "medium low code model" 266 config CMODEL_MEDANY 267 bool "medium any code model" 268endchoice 269 270config MODULE_SECTIONS 271 bool 272 select HAVE_MOD_ARCH_SPECIFIC 273 274choice 275 prompt "Maximum Physical Memory" 276 default MAXPHYSMEM_1GB if 32BIT 277 default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW 278 default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY 279 280 config MAXPHYSMEM_1GB 281 depends on 32BIT 282 bool "1GiB" 283 config MAXPHYSMEM_2GB 284 depends on 64BIT 285 bool "2GiB" 286 config MAXPHYSMEM_128GB 287 depends on 64BIT && CMODEL_MEDANY 288 bool "128GiB" 289endchoice 290 291 292config SMP 293 bool "Symmetric Multi-Processing" 294 help 295 This enables support for systems with more than one CPU. If 296 you say N here, the kernel will run on single and 297 multiprocessor machines, but will use only one CPU of a 298 multiprocessor machine. If you say Y here, the kernel will run 299 on many, but not all, single processor machines. On a single 300 processor machine, the kernel will run faster if you say N 301 here. 302 303 If you don't know what to do here, say N. 304 305config NR_CPUS 306 int "Maximum number of CPUs (2-32)" 307 range 2 32 308 depends on SMP 309 default "8" 310 311config HOTPLUG_CPU 312 bool "Support for hot-pluggable CPUs" 313 depends on SMP 314 select GENERIC_IRQ_MIGRATION 315 help 316 317 Say Y here to experiment with turning CPUs off and on. CPUs 318 can be controlled through /sys/devices/system/cpu. 319 320 Say N if you want to disable CPU hotplug. 321 322choice 323 prompt "CPU Tuning" 324 default TUNE_GENERIC 325 326config TUNE_GENERIC 327 bool "generic" 328 329endchoice 330 331# Common NUMA Features 332config NUMA 333 bool "NUMA Memory Allocation and Scheduler Support" 334 depends on SMP && MMU 335 select GENERIC_ARCH_NUMA 336 select OF_NUMA 337 select ARCH_SUPPORTS_NUMA_BALANCING 338 help 339 Enable NUMA (Non-Uniform Memory Access) support. 340 341 The kernel will try to allocate memory used by a CPU on the 342 local memory of the CPU and add some more NUMA awareness to the kernel. 343 344config NODES_SHIFT 345 int "Maximum NUMA Nodes (as a power of 2)" 346 range 1 10 347 default "2" 348 depends on NUMA 349 help 350 Specify the maximum number of NUMA Nodes available on the target 351 system. Increases memory reserved to accommodate various tables. 352 353config USE_PERCPU_NUMA_NODE_ID 354 def_bool y 355 depends on NUMA 356 357config NEED_PER_CPU_EMBED_FIRST_CHUNK 358 def_bool y 359 depends on NUMA 360 361config RISCV_ISA_C 362 bool "Emit compressed instructions when building Linux" 363 default y 364 help 365 Adds "C" to the ISA subsets that the toolchain is allowed to emit 366 when building Linux, which results in compressed instructions in the 367 Linux binary. 368 369 If you don't know what to do here, say Y. 370 371menu "supported PMU type" 372 depends on PERF_EVENTS 373 374config RISCV_BASE_PMU 375 bool "Base Performance Monitoring Unit" 376 def_bool y 377 help 378 A base PMU that serves as a reference implementation and has limited 379 feature of perf. It can run on any RISC-V machines so serves as the 380 fallback, but this option can also be disable to reduce kernel size. 381 382endmenu 383 384config FPU 385 bool "FPU support" 386 default y 387 help 388 Say N here if you want to disable all floating-point related procedure 389 in the kernel. 390 391 If you don't know what to do here, say Y. 392 393endmenu 394 395menu "Kernel features" 396 397source "kernel/Kconfig.hz" 398 399config RISCV_SBI_V01 400 bool "SBI v0.1 support" 401 default y 402 depends on RISCV_SBI 403 help 404 This config allows kernel to use SBI v0.1 APIs. This will be 405 deprecated in future once legacy M-mode software are no longer in use. 406 407config KEXEC 408 bool "Kexec system call" 409 select KEXEC_CORE 410 select HOTPLUG_CPU if SMP 411 depends on MMU 412 help 413 kexec is a system call that implements the ability to shutdown your 414 current kernel, and to start another kernel. It is like a reboot 415 but it is independent of the system firmware. And like a reboot 416 you can start any kernel with it, not just Linux. 417 418 The name comes from the similarity to the exec system call. 419 420config CRASH_DUMP 421 bool "Build kdump crash kernel" 422 help 423 Generate crash dump after being started by kexec. This should 424 be normally only set in special crash dump kernels which are 425 loaded in the main kernel with kexec-tools into a specially 426 reserved region and then later executed after a crash by 427 kdump/kexec. 428 429 For more details see Documentation/admin-guide/kdump/kdump.rst 430 431endmenu 432 433menu "Boot options" 434 435config CMDLINE 436 string "Built-in kernel command line" 437 help 438 For most platforms, the arguments for the kernel's command line 439 are provided at run-time, during boot. However, there are cases 440 where either no arguments are being provided or the provided 441 arguments are insufficient or even invalid. 442 443 When that occurs, it is possible to define a built-in command 444 line here and choose how the kernel should use it later on. 445 446choice 447 prompt "Built-in command line usage" if CMDLINE != "" 448 default CMDLINE_FALLBACK 449 help 450 Choose how the kernel will handle the provided built-in command 451 line. 452 453config CMDLINE_FALLBACK 454 bool "Use bootloader kernel arguments if available" 455 help 456 Use the built-in command line as fallback in case we get nothing 457 during boot. This is the default behaviour. 458 459config CMDLINE_EXTEND 460 bool "Extend bootloader kernel arguments" 461 help 462 The command-line arguments provided during boot will be 463 appended to the built-in command line. This is useful in 464 cases where the provided arguments are insufficient and 465 you don't want to or cannot modify them. 466 467 468config CMDLINE_FORCE 469 bool "Always use the default kernel command string" 470 help 471 Always use the built-in command line, even if we get one during 472 boot. This is useful in case you need to override the provided 473 command line on systems where you don't have or want control 474 over it. 475 476endchoice 477 478config EFI_STUB 479 bool 480 481config EFI 482 bool "UEFI runtime support" 483 depends on OF && !XIP_KERNEL 484 select LIBFDT 485 select UCS2_STRING 486 select EFI_PARAMS_FROM_FDT 487 select EFI_STUB 488 select EFI_GENERIC_STUB 489 select EFI_RUNTIME_WRAPPERS 490 select RISCV_ISA_C 491 depends on MMU 492 default y 493 help 494 This option provides support for runtime services provided 495 by UEFI firmware (such as non-volatile variables, realtime 496 clock, and platform reset). A UEFI stub is also provided to 497 allow the kernel to be booted as an EFI application. This 498 is only useful on systems that have UEFI firmware. 499 500config CC_HAVE_STACKPROTECTOR_TLS 501 def_bool $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=tp -mstack-protector-guard-offset=0) 502 503config STACKPROTECTOR_PER_TASK 504 def_bool y 505 depends on !GCC_PLUGIN_RANDSTRUCT 506 depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS 507 508config PHYS_RAM_BASE_FIXED 509 bool "Explicitly specified physical RAM address" 510 default n 511 512config PHYS_RAM_BASE 513 hex "Platform Physical RAM address" 514 depends on PHYS_RAM_BASE_FIXED 515 default "0x80000000" 516 help 517 This is the physical address of RAM in the system. It has to be 518 explicitly specified to run early relocations of read-write data 519 from flash to RAM. 520 521config XIP_KERNEL 522 bool "Kernel Execute-In-Place from ROM" 523 depends on MMU && SPARSEMEM 524 # This prevents XIP from being enabled by all{yes,mod}config, which 525 # fail to build since XIP doesn't support large kernels. 526 depends on !COMPILE_TEST 527 select PHYS_RAM_BASE_FIXED 528 help 529 Execute-In-Place allows the kernel to run from non-volatile storage 530 directly addressable by the CPU, such as NOR flash. This saves RAM 531 space since the text section of the kernel is not loaded from flash 532 to RAM. Read-write sections, such as the data section and stack, 533 are still copied to RAM. The XIP kernel is not compressed since 534 it has to run directly from flash, so it will take more space to 535 store it. The flash address used to link the kernel object files, 536 and for storing it, is configuration dependent. Therefore, if you 537 say Y here, you must know the proper physical address where to 538 store the kernel image depending on your own flash memory usage. 539 540 Also note that the make target becomes "make xipImage" rather than 541 "make zImage" or "make Image". The final kernel binary to put in 542 ROM memory will be arch/riscv/boot/xipImage. 543 544 SPARSEMEM is required because the kernel text and rodata that are 545 flash resident are not backed by memmap, then any attempt to get 546 a struct page on those regions will trigger a fault. 547 548 If unsure, say N. 549 550config XIP_PHYS_ADDR 551 hex "XIP Kernel Physical Location" 552 depends on XIP_KERNEL 553 default "0x21000000" 554 help 555 This is the physical address in your flash memory the kernel will 556 be linked for and stored to. This address is dependent on your 557 own flash usage. 558 559endmenu 560 561config BUILTIN_DTB 562 bool 563 depends on OF 564 default y if XIP_KERNEL 565 566menu "Power management options" 567 568source "kernel/power/Kconfig" 569 570endmenu 571 572source "arch/riscv/kvm/Kconfig" 573