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_SECCOMP_FILTER 82 select HAVE_ARCH_TRACEHOOK 83 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT && MMU 84 select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE 85 select HAVE_ARCH_THREAD_STRUCT_WHITELIST 86 select HAVE_ARCH_VMAP_STACK if MMU && 64BIT 87 select HAVE_ASM_MODVERSIONS 88 select HAVE_CONTEXT_TRACKING 89 select HAVE_DEBUG_KMEMLEAK 90 select HAVE_DMA_CONTIGUOUS if MMU 91 select HAVE_EBPF_JIT if MMU 92 select HAVE_FUNCTION_ERROR_INJECTION 93 select HAVE_GCC_PLUGINS 94 select HAVE_GENERIC_VDSO if MMU && 64BIT 95 select HAVE_IRQ_TIME_ACCOUNTING 96 select HAVE_KPROBES if !XIP_KERNEL 97 select HAVE_KPROBES_ON_FTRACE if !XIP_KERNEL 98 select HAVE_KRETPROBES if !XIP_KERNEL 99 select HAVE_MOVE_PMD 100 select HAVE_MOVE_PUD 101 select HAVE_PCI 102 select HAVE_PERF_EVENTS 103 select HAVE_PERF_REGS 104 select HAVE_PERF_USER_STACK_DUMP 105 select HAVE_REGS_AND_STACK_ACCESS_API 106 select HAVE_FUNCTION_ARG_ACCESS_API 107 select HAVE_STACKPROTECTOR 108 select HAVE_SYSCALL_TRACEPOINTS 109 select HAVE_RSEQ 110 select IRQ_DOMAIN 111 select IRQ_FORCED_THREADING 112 select MODULES_USE_ELF_RELA if MODULES 113 select MODULE_SECTIONS if MODULES 114 select OF 115 select OF_EARLY_FLATTREE 116 select OF_IRQ 117 select PCI_DOMAINS_GENERIC if PCI 118 select PCI_MSI if PCI 119 select RISCV_INTC 120 select RISCV_TIMER if RISCV_SBI 121 select SPARSE_IRQ 122 select SYSCTL_EXCEPTION_TRACE 123 select THREAD_INFO_IN_TASK 124 select TRACE_IRQFLAGS_SUPPORT 125 select UACCESS_MEMCPY if !MMU 126 select ZONE_DMA32 if 64BIT 127 128config ARCH_MMAP_RND_BITS_MIN 129 default 18 if 64BIT 130 default 8 131 132# max bits determined by the following formula: 133# VA_BITS - PAGE_SHIFT - 3 134config ARCH_MMAP_RND_BITS_MAX 135 default 24 if 64BIT # SV39 based 136 default 17 137 138# set if we run in machine mode, cleared if we run in supervisor mode 139config RISCV_M_MODE 140 bool 141 default !MMU 142 143# set if we are running in S-mode and can use SBI calls 144config RISCV_SBI 145 bool 146 depends on !RISCV_M_MODE 147 default y 148 149config MMU 150 bool "MMU-based Paged Memory Management Support" 151 default y 152 help 153 Select if you want MMU-based virtualised addressing space 154 support by paged memory management. If unsure, say 'Y'. 155 156config PAGE_OFFSET 157 hex 158 default 0xC0000000 if 32BIT 159 default 0x80000000 if 64BIT && !MMU 160 default 0xff60000000000000 if 64BIT 161 162config KASAN_SHADOW_OFFSET 163 hex 164 depends on KASAN_GENERIC 165 default 0xdfffffff00000000 if 64BIT 166 default 0xffffffff if 32BIT 167 168config ARCH_FLATMEM_ENABLE 169 def_bool !NUMA 170 171config ARCH_SPARSEMEM_ENABLE 172 def_bool y 173 depends on MMU 174 select SPARSEMEM_STATIC if 32BIT && SPARSEMEM 175 select SPARSEMEM_VMEMMAP_ENABLE if 64BIT 176 177config ARCH_SELECT_MEMORY_MODEL 178 def_bool ARCH_SPARSEMEM_ENABLE 179 180config ARCH_SUPPORTS_UPROBES 181 def_bool y 182 183config STACKTRACE_SUPPORT 184 def_bool y 185 186config GENERIC_BUG 187 def_bool y 188 depends on BUG 189 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT 190 191config GENERIC_BUG_RELATIVE_POINTERS 192 bool 193 194config GENERIC_CALIBRATE_DELAY 195 def_bool y 196 197config GENERIC_CSUM 198 def_bool y 199 200config GENERIC_HWEIGHT 201 def_bool y 202 203config FIX_EARLYCON_MEM 204 def_bool MMU 205 206config PGTABLE_LEVELS 207 int 208 default 5 if 64BIT 209 default 2 210 211config LOCKDEP_SUPPORT 212 def_bool y 213 214source "arch/riscv/Kconfig.socs" 215source "arch/riscv/Kconfig.erratas" 216 217menu "Platform type" 218 219choice 220 prompt "Base ISA" 221 default ARCH_RV64I 222 help 223 This selects the base ISA that this kernel will target and must match 224 the target platform. 225 226config ARCH_RV32I 227 bool "RV32I" 228 select 32BIT 229 select GENERIC_LIB_ASHLDI3 230 select GENERIC_LIB_ASHRDI3 231 select GENERIC_LIB_LSHRDI3 232 select GENERIC_LIB_UCMPDI2 233 select MMU 234 235config ARCH_RV64I 236 bool "RV64I" 237 select 64BIT 238 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 239 select HAVE_DYNAMIC_FTRACE if !XIP_KERNEL && MMU && $(cc-option,-fpatchable-function-entry=8) 240 select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE 241 select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL 242 select HAVE_FUNCTION_GRAPH_TRACER 243 select HAVE_FUNCTION_TRACER if !XIP_KERNEL 244 select SWIOTLB if MMU 245 246endchoice 247 248# We must be able to map all physical memory into the kernel, but the compiler 249# is still a bit more efficient when generating code if it's setup in a manner 250# such that it can only map 2GiB of memory. 251choice 252 prompt "Kernel Code Model" 253 default CMODEL_MEDLOW if 32BIT 254 default CMODEL_MEDANY if 64BIT 255 256 config CMODEL_MEDLOW 257 bool "medium low code model" 258 config CMODEL_MEDANY 259 bool "medium any code model" 260endchoice 261 262config MODULE_SECTIONS 263 bool 264 select HAVE_MOD_ARCH_SPECIFIC 265 266config SMP 267 bool "Symmetric Multi-Processing" 268 help 269 This enables support for systems with more than one CPU. If 270 you say N here, the kernel will run on single and 271 multiprocessor machines, but will use only one CPU of a 272 multiprocessor machine. If you say Y here, the kernel will run 273 on many, but not all, single processor machines. On a single 274 processor machine, the kernel will run faster if you say N 275 here. 276 277 If you don't know what to do here, say N. 278 279config NR_CPUS 280 int "Maximum number of CPUs (2-32)" 281 range 2 32 282 depends on SMP 283 default "8" 284 285config HOTPLUG_CPU 286 bool "Support for hot-pluggable CPUs" 287 depends on SMP 288 select GENERIC_IRQ_MIGRATION 289 help 290 291 Say Y here to experiment with turning CPUs off and on. CPUs 292 can be controlled through /sys/devices/system/cpu. 293 294 Say N if you want to disable CPU hotplug. 295 296choice 297 prompt "CPU Tuning" 298 default TUNE_GENERIC 299 300config TUNE_GENERIC 301 bool "generic" 302 303endchoice 304 305# Common NUMA Features 306config NUMA 307 bool "NUMA Memory Allocation and Scheduler Support" 308 depends on SMP && MMU 309 select GENERIC_ARCH_NUMA 310 select OF_NUMA 311 select ARCH_SUPPORTS_NUMA_BALANCING 312 select USE_PERCPU_NUMA_NODE_ID 313 select NEED_PER_CPU_EMBED_FIRST_CHUNK 314 help 315 Enable NUMA (Non-Uniform Memory Access) support. 316 317 The kernel will try to allocate memory used by a CPU on the 318 local memory of the CPU and add some more NUMA awareness to the kernel. 319 320config NODES_SHIFT 321 int "Maximum NUMA Nodes (as a power of 2)" 322 range 1 10 323 default "2" 324 depends on NUMA 325 help 326 Specify the maximum number of NUMA Nodes available on the target 327 system. Increases memory reserved to accommodate various tables. 328 329config RISCV_ISA_C 330 bool "Emit compressed instructions when building Linux" 331 default y 332 help 333 Adds "C" to the ISA subsets that the toolchain is allowed to emit 334 when building Linux, which results in compressed instructions in the 335 Linux binary. 336 337 If you don't know what to do here, say Y. 338 339config FPU 340 bool "FPU support" 341 default y 342 help 343 Say N here if you want to disable all floating-point related procedure 344 in the kernel. 345 346 If you don't know what to do here, say Y. 347 348endmenu 349 350menu "Kernel features" 351 352source "kernel/Kconfig.hz" 353 354config RISCV_SBI_V01 355 bool "SBI v0.1 support" 356 depends on RISCV_SBI 357 help 358 This config allows kernel to use SBI v0.1 APIs. This will be 359 deprecated in future once legacy M-mode software are no longer in use. 360 361config RISCV_BOOT_SPINWAIT 362 bool "Spinwait booting method" 363 depends on SMP 364 default y 365 help 366 This enables support for booting Linux via spinwait method. In the 367 spinwait method, all cores randomly jump to Linux. One of the cores 368 gets chosen via lottery and all other keep spinning on a percpu 369 variable. This method cannot support CPU hotplug and sparse hartid 370 scheme. It should be only enabled for M-mode Linux or platforms relying 371 on older firmware without SBI HSM extension. All other platforms should 372 rely on ordered booting via SBI HSM extension which gets chosen 373 dynamically at runtime if the firmware supports it. 374 375config KEXEC 376 bool "Kexec system call" 377 select KEXEC_CORE 378 select HOTPLUG_CPU if SMP 379 depends on MMU 380 help 381 kexec is a system call that implements the ability to shutdown your 382 current kernel, and to start another kernel. It is like a reboot 383 but it is independent of the system firmware. And like a reboot 384 you can start any kernel with it, not just Linux. 385 386 The name comes from the similarity to the exec system call. 387 388config CRASH_DUMP 389 bool "Build kdump crash kernel" 390 help 391 Generate crash dump after being started by kexec. This should 392 be normally only set in special crash dump kernels which are 393 loaded in the main kernel with kexec-tools into a specially 394 reserved region and then later executed after a crash by 395 kdump/kexec. 396 397 For more details see Documentation/admin-guide/kdump/kdump.rst 398 399endmenu 400 401menu "Boot options" 402 403config CMDLINE 404 string "Built-in kernel command line" 405 help 406 For most platforms, the arguments for the kernel's command line 407 are provided at run-time, during boot. However, there are cases 408 where either no arguments are being provided or the provided 409 arguments are insufficient or even invalid. 410 411 When that occurs, it is possible to define a built-in command 412 line here and choose how the kernel should use it later on. 413 414choice 415 prompt "Built-in command line usage" if CMDLINE != "" 416 default CMDLINE_FALLBACK 417 help 418 Choose how the kernel will handle the provided built-in command 419 line. 420 421config CMDLINE_FALLBACK 422 bool "Use bootloader kernel arguments if available" 423 help 424 Use the built-in command line as fallback in case we get nothing 425 during boot. This is the default behaviour. 426 427config CMDLINE_EXTEND 428 bool "Extend bootloader kernel arguments" 429 help 430 The command-line arguments provided during boot will be 431 appended to the built-in command line. This is useful in 432 cases where the provided arguments are insufficient and 433 you don't want to or cannot modify them. 434 435 436config CMDLINE_FORCE 437 bool "Always use the default kernel command string" 438 help 439 Always use the built-in command line, even if we get one during 440 boot. This is useful in case you need to override the provided 441 command line on systems where you don't have or want control 442 over it. 443 444endchoice 445 446config EFI_STUB 447 bool 448 449config EFI 450 bool "UEFI runtime support" 451 depends on OF && !XIP_KERNEL 452 select LIBFDT 453 select UCS2_STRING 454 select EFI_PARAMS_FROM_FDT 455 select EFI_STUB 456 select EFI_GENERIC_STUB 457 select EFI_RUNTIME_WRAPPERS 458 select RISCV_ISA_C 459 depends on MMU 460 default y 461 help 462 This option provides support for runtime services provided 463 by UEFI firmware (such as non-volatile variables, realtime 464 clock, and platform reset). A UEFI stub is also provided to 465 allow the kernel to be booted as an EFI application. This 466 is only useful on systems that have UEFI firmware. 467 468config CC_HAVE_STACKPROTECTOR_TLS 469 def_bool $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=tp -mstack-protector-guard-offset=0) 470 471config STACKPROTECTOR_PER_TASK 472 def_bool y 473 depends on !RANDSTRUCT 474 depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS 475 476config PHYS_RAM_BASE_FIXED 477 bool "Explicitly specified physical RAM address" 478 default n 479 480config PHYS_RAM_BASE 481 hex "Platform Physical RAM address" 482 depends on PHYS_RAM_BASE_FIXED 483 default "0x80000000" 484 help 485 This is the physical address of RAM in the system. It has to be 486 explicitly specified to run early relocations of read-write data 487 from flash to RAM. 488 489config XIP_KERNEL 490 bool "Kernel Execute-In-Place from ROM" 491 depends on MMU && SPARSEMEM 492 # This prevents XIP from being enabled by all{yes,mod}config, which 493 # fail to build since XIP doesn't support large kernels. 494 depends on !COMPILE_TEST 495 select PHYS_RAM_BASE_FIXED 496 help 497 Execute-In-Place allows the kernel to run from non-volatile storage 498 directly addressable by the CPU, such as NOR flash. This saves RAM 499 space since the text section of the kernel is not loaded from flash 500 to RAM. Read-write sections, such as the data section and stack, 501 are still copied to RAM. The XIP kernel is not compressed since 502 it has to run directly from flash, so it will take more space to 503 store it. The flash address used to link the kernel object files, 504 and for storing it, is configuration dependent. Therefore, if you 505 say Y here, you must know the proper physical address where to 506 store the kernel image depending on your own flash memory usage. 507 508 Also note that the make target becomes "make xipImage" rather than 509 "make zImage" or "make Image". The final kernel binary to put in 510 ROM memory will be arch/riscv/boot/xipImage. 511 512 SPARSEMEM is required because the kernel text and rodata that are 513 flash resident are not backed by memmap, then any attempt to get 514 a struct page on those regions will trigger a fault. 515 516 If unsure, say N. 517 518config XIP_PHYS_ADDR 519 hex "XIP Kernel Physical Location" 520 depends on XIP_KERNEL 521 default "0x21000000" 522 help 523 This is the physical address in your flash memory the kernel will 524 be linked for and stored to. This address is dependent on your 525 own flash usage. 526 527endmenu 528 529config BUILTIN_DTB 530 bool 531 depends on OF 532 default y if XIP_KERNEL 533 534menu "Power management options" 535 536source "kernel/power/Kconfig" 537 538endmenu 539 540menu "CPU Power Management" 541 542source "drivers/cpuidle/Kconfig" 543 544endmenu 545 546source "arch/riscv/kvm/Kconfig" 547