Kconfig (17820B)
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_CURRENT_STACK_POINTER 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_FORTIFY_SOURCE 24 select ARCH_HAS_GCOV_PROFILE_ALL 25 select ARCH_HAS_GIGANTIC_PAGE 26 select ARCH_HAS_KCOV 27 select ARCH_HAS_MMIOWB 28 select ARCH_HAS_PTE_SPECIAL 29 select ARCH_HAS_SET_DIRECT_MAP if MMU 30 select ARCH_HAS_SET_MEMORY if MMU 31 select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL 32 select ARCH_HAS_STRICT_MODULE_RWX if MMU && !XIP_KERNEL 33 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 34 select ARCH_HAS_UBSAN_SANITIZE_ALL 35 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX 36 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT 37 select ARCH_STACKWALK 38 select ARCH_SUPPORTS_ATOMIC_RMW 39 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if MMU 40 select ARCH_SUPPORTS_HUGETLBFS if MMU 41 select ARCH_SUPPORTS_PAGE_TABLE_CHECK 42 select ARCH_USE_MEMTEST 43 select ARCH_USE_QUEUED_RWLOCKS 44 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU 45 select ARCH_WANT_FRAME_POINTERS 46 select ARCH_WANT_GENERAL_HUGETLB 47 select ARCH_WANT_HUGE_PMD_SHARE if 64BIT 48 select BINFMT_FLAT_NO_DATA_START_OFFSET if !MMU 49 select BUILDTIME_TABLE_SORT if MMU 50 select CLONE_BACKWARDS 51 select CLINT_TIMER if !MMU 52 select COMMON_CLK 53 select CPU_PM if CPU_IDLE 54 select EDAC_SUPPORT 55 select GENERIC_ARCH_TOPOLOGY if SMP 56 select GENERIC_ATOMIC64 if !64BIT 57 select GENERIC_CLOCKEVENTS_BROADCAST if SMP 58 select GENERIC_EARLY_IOREMAP 59 select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO 60 select GENERIC_IDLE_POLL_SETUP 61 select GENERIC_IOREMAP if MMU 62 select GENERIC_IRQ_MULTI_HANDLER 63 select GENERIC_IRQ_SHOW 64 select GENERIC_IRQ_SHOW_LEVEL 65 select GENERIC_LIB_DEVMEM_IS_ALLOWED 66 select GENERIC_PCI_IOMAP 67 select GENERIC_PTDUMP if MMU 68 select GENERIC_SCHED_CLOCK 69 select GENERIC_SMP_IDLE_THREAD 70 select GENERIC_TIME_VSYSCALL if MMU && 64BIT 71 select GENERIC_VDSO_TIME_NS if HAVE_GENERIC_VDSO 72 select HAVE_ARCH_AUDITSYSCALL 73 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL 74 select HAVE_ARCH_JUMP_LABEL_RELATIVE if !XIP_KERNEL 75 select HAVE_ARCH_KASAN if MMU && 64BIT 76 select HAVE_ARCH_KASAN_VMALLOC if MMU && 64BIT 77 select HAVE_ARCH_KFENCE if MMU && 64BIT 78 select HAVE_ARCH_KGDB if !XIP_KERNEL 79 select HAVE_ARCH_KGDB_QXFER_PKT 80 select HAVE_ARCH_MMAP_RND_BITS if MMU 81 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT 82 select HAVE_ARCH_SECCOMP_FILTER 83 select HAVE_ARCH_TRACEHOOK 84 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT && MMU 85 select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE 86 select HAVE_ARCH_THREAD_STRUCT_WHITELIST 87 select HAVE_ARCH_VMAP_STACK if MMU && 64BIT 88 select HAVE_ASM_MODVERSIONS 89 select HAVE_CONTEXT_TRACKING 90 select HAVE_DEBUG_KMEMLEAK 91 select HAVE_DMA_CONTIGUOUS if MMU 92 select HAVE_EBPF_JIT if MMU 93 select HAVE_FUNCTION_ERROR_INJECTION 94 select HAVE_GCC_PLUGINS 95 select HAVE_GENERIC_VDSO if MMU && 64BIT 96 select HAVE_IRQ_TIME_ACCOUNTING 97 select HAVE_KPROBES if !XIP_KERNEL 98 select HAVE_KPROBES_ON_FTRACE if !XIP_KERNEL 99 select HAVE_KRETPROBES if !XIP_KERNEL 100 select HAVE_MOVE_PMD 101 select HAVE_MOVE_PUD 102 select HAVE_PCI 103 select HAVE_PERF_EVENTS 104 select HAVE_PERF_REGS 105 select HAVE_PERF_USER_STACK_DUMP 106 select HAVE_REGS_AND_STACK_ACCESS_API 107 select HAVE_FUNCTION_ARG_ACCESS_API 108 select HAVE_STACKPROTECTOR 109 select HAVE_SYSCALL_TRACEPOINTS 110 select HAVE_RSEQ 111 select IRQ_DOMAIN 112 select IRQ_FORCED_THREADING 113 select MODULES_USE_ELF_RELA if MODULES 114 select MODULE_SECTIONS if MODULES 115 select OF 116 select OF_EARLY_FLATTREE 117 select OF_IRQ 118 select PCI_DOMAINS_GENERIC if PCI 119 select PCI_MSI if PCI 120 select RISCV_INTC 121 select RISCV_TIMER if RISCV_SBI 122 select SPARSE_IRQ 123 select SYSCTL_EXCEPTION_TRACE 124 select THREAD_INFO_IN_TASK 125 select TRACE_IRQFLAGS_SUPPORT 126 select UACCESS_MEMCPY if !MMU 127 select ZONE_DMA32 if 64BIT 128 129config ARCH_MMAP_RND_BITS_MIN 130 default 18 if 64BIT 131 default 8 132 133config ARCH_MMAP_RND_COMPAT_BITS_MIN 134 default 8 135 136# max bits determined by the following formula: 137# VA_BITS - PAGE_SHIFT - 3 138config ARCH_MMAP_RND_BITS_MAX 139 default 24 if 64BIT # SV39 based 140 default 17 141 142config ARCH_MMAP_RND_COMPAT_BITS_MAX 143 default 17 144 145# set if we run in machine mode, cleared if we run in supervisor mode 146config RISCV_M_MODE 147 bool 148 default !MMU 149 150# set if we are running in S-mode and can use SBI calls 151config RISCV_SBI 152 bool 153 depends on !RISCV_M_MODE 154 default y 155 156config MMU 157 bool "MMU-based Paged Memory Management Support" 158 default y 159 help 160 Select if you want MMU-based virtualised addressing space 161 support by paged memory management. If unsure, say 'Y'. 162 163config PAGE_OFFSET 164 hex 165 default 0xC0000000 if 32BIT 166 default 0x80000000 if 64BIT && !MMU 167 default 0xff60000000000000 if 64BIT 168 169config KASAN_SHADOW_OFFSET 170 hex 171 depends on KASAN_GENERIC 172 default 0xdfffffff00000000 if 64BIT 173 default 0xffffffff if 32BIT 174 175config ARCH_FLATMEM_ENABLE 176 def_bool !NUMA 177 178config ARCH_SPARSEMEM_ENABLE 179 def_bool y 180 depends on MMU 181 select SPARSEMEM_STATIC if 32BIT && SPARSEMEM 182 select SPARSEMEM_VMEMMAP_ENABLE if 64BIT 183 184config ARCH_SELECT_MEMORY_MODEL 185 def_bool ARCH_SPARSEMEM_ENABLE 186 187config ARCH_SUPPORTS_UPROBES 188 def_bool y 189 190config STACKTRACE_SUPPORT 191 def_bool y 192 193config GENERIC_BUG 194 def_bool y 195 depends on BUG 196 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT 197 198config GENERIC_BUG_RELATIVE_POINTERS 199 bool 200 201config GENERIC_CALIBRATE_DELAY 202 def_bool y 203 204config GENERIC_CSUM 205 def_bool y 206 207config GENERIC_HWEIGHT 208 def_bool y 209 210config FIX_EARLYCON_MEM 211 def_bool MMU 212 213config PGTABLE_LEVELS 214 int 215 default 5 if 64BIT 216 default 2 217 218config LOCKDEP_SUPPORT 219 def_bool y 220 221source "arch/riscv/Kconfig.socs" 222source "arch/riscv/Kconfig.erratas" 223 224menu "Platform type" 225 226choice 227 prompt "Base ISA" 228 default ARCH_RV64I 229 help 230 This selects the base ISA that this kernel will target and must match 231 the target platform. 232 233config ARCH_RV32I 234 bool "RV32I" 235 select 32BIT 236 select GENERIC_LIB_ASHLDI3 237 select GENERIC_LIB_ASHRDI3 238 select GENERIC_LIB_LSHRDI3 239 select GENERIC_LIB_UCMPDI2 240 select MMU 241 242config ARCH_RV64I 243 bool "RV64I" 244 select 64BIT 245 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 246 select HAVE_DYNAMIC_FTRACE if !XIP_KERNEL && MMU && $(cc-option,-fpatchable-function-entry=8) 247 select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE 248 select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL 249 select HAVE_FUNCTION_GRAPH_TRACER 250 select HAVE_FUNCTION_TRACER if !XIP_KERNEL 251 select SWIOTLB if MMU 252 253endchoice 254 255# We must be able to map all physical memory into the kernel, but the compiler 256# is still a bit more efficient when generating code if it's setup in a manner 257# such that it can only map 2GiB of memory. 258choice 259 prompt "Kernel Code Model" 260 default CMODEL_MEDLOW if 32BIT 261 default CMODEL_MEDANY if 64BIT 262 263 config CMODEL_MEDLOW 264 bool "medium low code model" 265 config CMODEL_MEDANY 266 bool "medium any code model" 267endchoice 268 269config MODULE_SECTIONS 270 bool 271 select HAVE_MOD_ARCH_SPECIFIC 272 273config SMP 274 bool "Symmetric Multi-Processing" 275 help 276 This enables support for systems with more than one CPU. If 277 you say N here, the kernel will run on single and 278 multiprocessor machines, but will use only one CPU of a 279 multiprocessor machine. If you say Y here, the kernel will run 280 on many, but not all, single processor machines. On a single 281 processor machine, the kernel will run faster if you say N 282 here. 283 284 If you don't know what to do here, say N. 285 286config NR_CPUS 287 int "Maximum number of CPUs (2-32)" 288 range 2 32 289 depends on SMP 290 default "8" 291 292config HOTPLUG_CPU 293 bool "Support for hot-pluggable CPUs" 294 depends on SMP 295 select GENERIC_IRQ_MIGRATION 296 help 297 298 Say Y here to experiment with turning CPUs off and on. CPUs 299 can be controlled through /sys/devices/system/cpu. 300 301 Say N if you want to disable CPU hotplug. 302 303choice 304 prompt "CPU Tuning" 305 default TUNE_GENERIC 306 307config TUNE_GENERIC 308 bool "generic" 309 310endchoice 311 312# Common NUMA Features 313config NUMA 314 bool "NUMA Memory Allocation and Scheduler Support" 315 depends on SMP && MMU 316 select GENERIC_ARCH_NUMA 317 select OF_NUMA 318 select ARCH_SUPPORTS_NUMA_BALANCING 319 select USE_PERCPU_NUMA_NODE_ID 320 select NEED_PER_CPU_EMBED_FIRST_CHUNK 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 NUMA 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 RISCV_ALTERNATIVE 337 bool 338 depends on !XIP_KERNEL 339 help 340 This Kconfig allows the kernel to automatically patch the 341 errata required by the execution platform at run time. The 342 code patching is performed once in the boot stages. It means 343 that the overhead from this mechanism is just taken once. 344 345config RISCV_ALTERNATIVE_EARLY 346 bool 347 depends on RISCV_ALTERNATIVE 348 help 349 Allows early patching of the kernel for special errata 350 351config RISCV_ISA_C 352 bool "Emit compressed instructions when building Linux" 353 default y 354 help 355 Adds "C" to the ISA subsets that the toolchain is allowed to emit 356 when building Linux, which results in compressed instructions in the 357 Linux binary. 358 359 If you don't know what to do here, say Y. 360 361config RISCV_ISA_SVPBMT 362 bool "SVPBMT extension support" 363 depends on 64BIT && MMU 364 select RISCV_ALTERNATIVE 365 default y 366 help 367 Adds support to dynamically detect the presence of the SVPBMT 368 ISA-extension (Supervisor-mode: page-based memory types) and 369 enable its usage. 370 371 The memory type for a page contains a combination of attributes 372 that indicate the cacheability, idempotency, and ordering 373 properties for access to that page. 374 375 The SVPBMT extension is only available on 64Bit cpus. 376 377 If you don't know what to do here, say Y. 378 379config FPU 380 bool "FPU support" 381 default y 382 help 383 Say N here if you want to disable all floating-point related procedure 384 in the kernel. 385 386 If you don't know what to do here, say Y. 387 388endmenu 389 390menu "Kernel features" 391 392source "kernel/Kconfig.hz" 393 394config RISCV_SBI_V01 395 bool "SBI v0.1 support" 396 depends on RISCV_SBI 397 help 398 This config allows kernel to use SBI v0.1 APIs. This will be 399 deprecated in future once legacy M-mode software are no longer in use. 400 401config RISCV_BOOT_SPINWAIT 402 bool "Spinwait booting method" 403 depends on SMP 404 default y if RISCV_SBI_V01 || RISCV_M_MODE 405 help 406 This enables support for booting Linux via spinwait method. In the 407 spinwait method, all cores randomly jump to Linux. One of the cores 408 gets chosen via lottery and all other keep spinning on a percpu 409 variable. This method cannot support CPU hotplug and sparse hartid 410 scheme. It should be only enabled for M-mode Linux or platforms relying 411 on older firmware without SBI HSM extension. All other platforms should 412 rely on ordered booting via SBI HSM extension which gets chosen 413 dynamically at runtime if the firmware supports it. 414 415 Since spinwait is incompatible with sparse hart IDs, it requires 416 NR_CPUS be large enough to contain the physical hart ID of the first 417 hart to enter Linux. 418 419 If unsure what to do here, say N. 420 421config KEXEC 422 bool "Kexec system call" 423 select KEXEC_CORE 424 select HOTPLUG_CPU if SMP 425 depends on MMU 426 help 427 kexec is a system call that implements the ability to shutdown your 428 current kernel, and to start another kernel. It is like a reboot 429 but it is independent of the system firmware. And like a reboot 430 you can start any kernel with it, not just Linux. 431 432 The name comes from the similarity to the exec system call. 433 434config KEXEC_FILE 435 bool "kexec file based systmem call" 436 select KEXEC_CORE 437 select KEXEC_ELF 438 select HAVE_IMA_KEXEC if IMA 439 depends on 64BIT 440 help 441 This is new version of kexec system call. This system call is 442 file based and takes file descriptors as system call argument 443 for kernel and initramfs as opposed to list of segments as 444 accepted by previous system call. 445 446 If you don't know what to do here, say Y. 447 448config ARCH_HAS_KEXEC_PURGATORY 449 def_bool KEXEC_FILE 450 select BUILD_BIN2C 451 depends on CRYPTO=y 452 depends on CRYPTO_SHA256=y 453 454config CRASH_DUMP 455 bool "Build kdump crash kernel" 456 help 457 Generate crash dump after being started by kexec. This should 458 be normally only set in special crash dump kernels which are 459 loaded in the main kernel with kexec-tools into a specially 460 reserved region and then later executed after a crash by 461 kdump/kexec. 462 463 For more details see Documentation/admin-guide/kdump/kdump.rst 464 465config COMPAT 466 bool "Kernel support for 32-bit U-mode" 467 default 64BIT 468 depends on 64BIT && MMU 469 help 470 This option enables support for a 32-bit U-mode running under a 64-bit 471 kernel at S-mode. riscv32-specific components such as system calls, 472 the user helper functions (vdso), signal rt_frame functions and the 473 ptrace interface are handled appropriately by the kernel. 474 475 If you want to execute 32-bit userspace applications, say Y. 476 477endmenu 478 479menu "Boot options" 480 481config CMDLINE 482 string "Built-in kernel command line" 483 help 484 For most platforms, the arguments for the kernel's command line 485 are provided at run-time, during boot. However, there are cases 486 where either no arguments are being provided or the provided 487 arguments are insufficient or even invalid. 488 489 When that occurs, it is possible to define a built-in command 490 line here and choose how the kernel should use it later on. 491 492choice 493 prompt "Built-in command line usage" if CMDLINE != "" 494 default CMDLINE_FALLBACK 495 help 496 Choose how the kernel will handle the provided built-in command 497 line. 498 499config CMDLINE_FALLBACK 500 bool "Use bootloader kernel arguments if available" 501 help 502 Use the built-in command line as fallback in case we get nothing 503 during boot. This is the default behaviour. 504 505config CMDLINE_EXTEND 506 bool "Extend bootloader kernel arguments" 507 help 508 The command-line arguments provided during boot will be 509 appended to the built-in command line. This is useful in 510 cases where the provided arguments are insufficient and 511 you don't want to or cannot modify them. 512 513 514config CMDLINE_FORCE 515 bool "Always use the default kernel command string" 516 help 517 Always use the built-in command line, even if we get one during 518 boot. This is useful in case you need to override the provided 519 command line on systems where you don't have or want control 520 over it. 521 522endchoice 523 524config EFI_STUB 525 bool 526 527config EFI 528 bool "UEFI runtime support" 529 depends on OF && !XIP_KERNEL 530 select LIBFDT 531 select UCS2_STRING 532 select EFI_PARAMS_FROM_FDT 533 select EFI_STUB 534 select EFI_GENERIC_STUB 535 select EFI_RUNTIME_WRAPPERS 536 select RISCV_ISA_C 537 depends on MMU 538 default y 539 help 540 This option provides support for runtime services provided 541 by UEFI firmware (such as non-volatile variables, realtime 542 clock, and platform reset). A UEFI stub is also provided to 543 allow the kernel to be booted as an EFI application. This 544 is only useful on systems that have UEFI firmware. 545 546config CC_HAVE_STACKPROTECTOR_TLS 547 def_bool $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=tp -mstack-protector-guard-offset=0) 548 549config STACKPROTECTOR_PER_TASK 550 def_bool y 551 depends on !RANDSTRUCT 552 depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS 553 554config PHYS_RAM_BASE_FIXED 555 bool "Explicitly specified physical RAM address" 556 default n 557 558config PHYS_RAM_BASE 559 hex "Platform Physical RAM address" 560 depends on PHYS_RAM_BASE_FIXED 561 default "0x80000000" 562 help 563 This is the physical address of RAM in the system. It has to be 564 explicitly specified to run early relocations of read-write data 565 from flash to RAM. 566 567config XIP_KERNEL 568 bool "Kernel Execute-In-Place from ROM" 569 depends on MMU && SPARSEMEM 570 # This prevents XIP from being enabled by all{yes,mod}config, which 571 # fail to build since XIP doesn't support large kernels. 572 depends on !COMPILE_TEST 573 select PHYS_RAM_BASE_FIXED 574 help 575 Execute-In-Place allows the kernel to run from non-volatile storage 576 directly addressable by the CPU, such as NOR flash. This saves RAM 577 space since the text section of the kernel is not loaded from flash 578 to RAM. Read-write sections, such as the data section and stack, 579 are still copied to RAM. The XIP kernel is not compressed since 580 it has to run directly from flash, so it will take more space to 581 store it. The flash address used to link the kernel object files, 582 and for storing it, is configuration dependent. Therefore, if you 583 say Y here, you must know the proper physical address where to 584 store the kernel image depending on your own flash memory usage. 585 586 Also note that the make target becomes "make xipImage" rather than 587 "make zImage" or "make Image". The final kernel binary to put in 588 ROM memory will be arch/riscv/boot/xipImage. 589 590 SPARSEMEM is required because the kernel text and rodata that are 591 flash resident are not backed by memmap, then any attempt to get 592 a struct page on those regions will trigger a fault. 593 594 If unsure, say N. 595 596config XIP_PHYS_ADDR 597 hex "XIP Kernel Physical Location" 598 depends on XIP_KERNEL 599 default "0x21000000" 600 help 601 This is the physical address in your flash memory the kernel will 602 be linked for and stored to. This address is dependent on your 603 own flash usage. 604 605endmenu 606 607config BUILTIN_DTB 608 bool 609 depends on OF 610 default y if XIP_KERNEL 611 612menu "Power management options" 613 614source "kernel/power/Kconfig" 615 616endmenu 617 618menu "CPU Power Management" 619 620source "drivers/cpuidle/Kconfig" 621 622endmenu 623 624source "arch/riscv/kvm/Kconfig"