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_GENERAL_HUGETLB 44 select ARCH_WANT_HUGE_PMD_SHARE if 64BIT 45 select BINFMT_FLAT_NO_DATA_START_OFFSET if !MMU 46 select BUILDTIME_TABLE_SORT if MMU 47 select CLONE_BACKWARDS 48 select CLINT_TIMER if !MMU 49 select COMMON_CLK 50 select EDAC_SUPPORT 51 select GENERIC_ARCH_TOPOLOGY if SMP 52 select GENERIC_ATOMIC64 if !64BIT 53 select GENERIC_CLOCKEVENTS_BROADCAST if SMP 54 select GENERIC_EARLY_IOREMAP 55 select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO 56 select GENERIC_IDLE_POLL_SETUP 57 select GENERIC_IOREMAP if MMU 58 select GENERIC_IRQ_MULTI_HANDLER 59 select GENERIC_IRQ_SHOW 60 select GENERIC_IRQ_SHOW_LEVEL 61 select GENERIC_LIB_DEVMEM_IS_ALLOWED 62 select GENERIC_PCI_IOMAP 63 select GENERIC_PTDUMP if MMU 64 select GENERIC_SCHED_CLOCK 65 select GENERIC_SMP_IDLE_THREAD 66 select GENERIC_TIME_VSYSCALL if MMU && 64BIT 67 select GENERIC_VDSO_TIME_NS if HAVE_GENERIC_VDSO 68 select HAVE_ARCH_AUDITSYSCALL 69 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL 70 select HAVE_ARCH_JUMP_LABEL_RELATIVE if !XIP_KERNEL 71 select HAVE_ARCH_KASAN if MMU && 64BIT 72 select HAVE_ARCH_KASAN_VMALLOC if MMU && 64BIT 73 select HAVE_ARCH_KFENCE if MMU && 64BIT 74 select HAVE_ARCH_KGDB if !XIP_KERNEL 75 select HAVE_ARCH_KGDB_QXFER_PKT 76 select HAVE_ARCH_MMAP_RND_BITS if MMU 77 select HAVE_ARCH_SECCOMP_FILTER 78 select HAVE_ARCH_TRACEHOOK 79 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT && MMU 80 select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE 81 select HAVE_ARCH_THREAD_STRUCT_WHITELIST 82 select HAVE_ARCH_VMAP_STACK if MMU && 64BIT 83 select HAVE_ASM_MODVERSIONS 84 select HAVE_CONTEXT_TRACKING 85 select HAVE_DEBUG_KMEMLEAK 86 select HAVE_DMA_CONTIGUOUS if MMU 87 select HAVE_EBPF_JIT if MMU 88 select HAVE_FUNCTION_ERROR_INJECTION 89 select HAVE_GCC_PLUGINS 90 select HAVE_GENERIC_VDSO if MMU && 64BIT 91 select HAVE_IRQ_TIME_ACCOUNTING 92 select HAVE_KPROBES if !XIP_KERNEL 93 select HAVE_KPROBES_ON_FTRACE if !XIP_KERNEL 94 select HAVE_KRETPROBES if !XIP_KERNEL 95 select HAVE_MOVE_PMD 96 select HAVE_MOVE_PUD 97 select HAVE_PCI 98 select HAVE_PERF_EVENTS 99 select HAVE_PERF_REGS 100 select HAVE_PERF_USER_STACK_DUMP 101 select HAVE_REGS_AND_STACK_ACCESS_API 102 select HAVE_FUNCTION_ARG_ACCESS_API 103 select HAVE_STACKPROTECTOR 104 select HAVE_SYSCALL_TRACEPOINTS 105 select IRQ_DOMAIN 106 select IRQ_FORCED_THREADING 107 select MODULES_USE_ELF_RELA if MODULES 108 select MODULE_SECTIONS if MODULES 109 select OF 110 select OF_EARLY_FLATTREE 111 select OF_IRQ 112 select PCI_DOMAINS_GENERIC if PCI 113 select PCI_MSI if PCI 114 select RISCV_INTC 115 select RISCV_TIMER if RISCV_SBI 116 select SPARSE_IRQ 117 select SYSCTL_EXCEPTION_TRACE 118 select THREAD_INFO_IN_TASK 119 select TRACE_IRQFLAGS_SUPPORT 120 select UACCESS_MEMCPY if !MMU 121 select ZONE_DMA32 if 64BIT 122 123config ARCH_MMAP_RND_BITS_MIN 124 default 18 if 64BIT 125 default 8 126 127# max bits determined by the following formula: 128# VA_BITS - PAGE_SHIFT - 3 129config ARCH_MMAP_RND_BITS_MAX 130 default 24 if 64BIT # SV39 based 131 default 17 132 133# set if we run in machine mode, cleared if we run in supervisor mode 134config RISCV_M_MODE 135 bool 136 default !MMU 137 138# set if we are running in S-mode and can use SBI calls 139config RISCV_SBI 140 bool 141 depends on !RISCV_M_MODE 142 default y 143 144config MMU 145 bool "MMU-based Paged Memory Management Support" 146 default y 147 help 148 Select if you want MMU-based virtualised addressing space 149 support by paged memory management. If unsure, say 'Y'. 150 151config PAGE_OFFSET 152 hex 153 default 0xC0000000 if 32BIT 154 default 0x80000000 if 64BIT && !MMU 155 default 0xffffaf8000000000 if 64BIT 156 157config KASAN_SHADOW_OFFSET 158 hex 159 depends on KASAN_GENERIC 160 default 0xdfffffff00000000 if 64BIT 161 default 0xffffffff if 32BIT 162 163config ARCH_FLATMEM_ENABLE 164 def_bool !NUMA 165 166config ARCH_SPARSEMEM_ENABLE 167 def_bool y 168 depends on MMU 169 select SPARSEMEM_STATIC if 32BIT && SPARSEMEM 170 select SPARSEMEM_VMEMMAP_ENABLE if 64BIT 171 172config ARCH_SELECT_MEMORY_MODEL 173 def_bool ARCH_SPARSEMEM_ENABLE 174 175config ARCH_SUPPORTS_UPROBES 176 def_bool y 177 178config STACKTRACE_SUPPORT 179 def_bool y 180 181config GENERIC_BUG 182 def_bool y 183 depends on BUG 184 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT 185 186config GENERIC_BUG_RELATIVE_POINTERS 187 bool 188 189config GENERIC_CALIBRATE_DELAY 190 def_bool y 191 192config GENERIC_CSUM 193 def_bool y 194 195config GENERIC_HWEIGHT 196 def_bool y 197 198config FIX_EARLYCON_MEM 199 def_bool MMU 200 201config PGTABLE_LEVELS 202 int 203 default 4 if 64BIT 204 default 2 205 206config LOCKDEP_SUPPORT 207 def_bool y 208 209source "arch/riscv/Kconfig.socs" 210source "arch/riscv/Kconfig.erratas" 211 212menu "Platform type" 213 214choice 215 prompt "Base ISA" 216 default ARCH_RV64I 217 help 218 This selects the base ISA that this kernel will target and must match 219 the target platform. 220 221config ARCH_RV32I 222 bool "RV32I" 223 select 32BIT 224 select GENERIC_LIB_ASHLDI3 225 select GENERIC_LIB_ASHRDI3 226 select GENERIC_LIB_LSHRDI3 227 select GENERIC_LIB_UCMPDI2 228 select MMU 229 230config ARCH_RV64I 231 bool "RV64I" 232 select 64BIT 233 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 234 select HAVE_DYNAMIC_FTRACE if !XIP_KERNEL && MMU && $(cc-option,-fpatchable-function-entry=8) 235 select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE 236 select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL 237 select HAVE_FUNCTION_GRAPH_TRACER 238 select HAVE_FUNCTION_TRACER if !XIP_KERNEL 239 select SWIOTLB if MMU 240 241endchoice 242 243# We must be able to map all physical memory into the kernel, but the compiler 244# is still a bit more efficient when generating code if it's setup in a manner 245# such that it can only map 2GiB of memory. 246choice 247 prompt "Kernel Code Model" 248 default CMODEL_MEDLOW if 32BIT 249 default CMODEL_MEDANY if 64BIT 250 251 config CMODEL_MEDLOW 252 bool "medium low code model" 253 config CMODEL_MEDANY 254 bool "medium any code model" 255endchoice 256 257config MODULE_SECTIONS 258 bool 259 select HAVE_MOD_ARCH_SPECIFIC 260 261config SMP 262 bool "Symmetric Multi-Processing" 263 help 264 This enables support for systems with more than one CPU. If 265 you say N here, the kernel will run on single and 266 multiprocessor machines, but will use only one CPU of a 267 multiprocessor machine. If you say Y here, the kernel will run 268 on many, but not all, single processor machines. On a single 269 processor machine, the kernel will run faster if you say N 270 here. 271 272 If you don't know what to do here, say N. 273 274config NR_CPUS 275 int "Maximum number of CPUs (2-32)" 276 range 2 32 277 depends on SMP 278 default "8" 279 280config HOTPLUG_CPU 281 bool "Support for hot-pluggable CPUs" 282 depends on SMP 283 select GENERIC_IRQ_MIGRATION 284 help 285 286 Say Y here to experiment with turning CPUs off and on. CPUs 287 can be controlled through /sys/devices/system/cpu. 288 289 Say N if you want to disable CPU hotplug. 290 291choice 292 prompt "CPU Tuning" 293 default TUNE_GENERIC 294 295config TUNE_GENERIC 296 bool "generic" 297 298endchoice 299 300# Common NUMA Features 301config NUMA 302 bool "NUMA Memory Allocation and Scheduler Support" 303 depends on SMP && MMU 304 select GENERIC_ARCH_NUMA 305 select OF_NUMA 306 select ARCH_SUPPORTS_NUMA_BALANCING 307 select USE_PERCPU_NUMA_NODE_ID 308 select NEED_PER_CPU_EMBED_FIRST_CHUNK 309 help 310 Enable NUMA (Non-Uniform Memory Access) support. 311 312 The kernel will try to allocate memory used by a CPU on the 313 local memory of the CPU and add some more NUMA awareness to the kernel. 314 315config NODES_SHIFT 316 int "Maximum NUMA Nodes (as a power of 2)" 317 range 1 10 318 default "2" 319 depends on NUMA 320 help 321 Specify the maximum number of NUMA Nodes available on the target 322 system. Increases memory reserved to accommodate various tables. 323 324config RISCV_ISA_C 325 bool "Emit compressed instructions when building Linux" 326 default y 327 help 328 Adds "C" to the ISA subsets that the toolchain is allowed to emit 329 when building Linux, which results in compressed instructions in the 330 Linux binary. 331 332 If you don't know what to do here, say Y. 333 334menu "supported PMU type" 335 depends on PERF_EVENTS 336 337config RISCV_BASE_PMU 338 bool "Base Performance Monitoring Unit" 339 def_bool y 340 help 341 A base PMU that serves as a reference implementation and has limited 342 feature of perf. It can run on any RISC-V machines so serves as the 343 fallback, but this option can also be disable to reduce kernel size. 344 345endmenu 346 347config FPU 348 bool "FPU support" 349 default y 350 help 351 Say N here if you want to disable all floating-point related procedure 352 in the kernel. 353 354 If you don't know what to do here, say Y. 355 356endmenu 357 358menu "Kernel features" 359 360source "kernel/Kconfig.hz" 361 362config RISCV_SBI_V01 363 bool "SBI v0.1 support" 364 depends on RISCV_SBI 365 help 366 This config allows kernel to use SBI v0.1 APIs. This will be 367 deprecated in future once legacy M-mode software are no longer in use. 368 369config RISCV_BOOT_SPINWAIT 370 bool "Spinwait booting method" 371 depends on SMP 372 default y 373 help 374 This enables support for booting Linux via spinwait method. In the 375 spinwait method, all cores randomly jump to Linux. One of the cores 376 gets chosen via lottery and all other keep spinning on a percpu 377 variable. This method cannot support CPU hotplug and sparse hartid 378 scheme. It should be only enabled for M-mode Linux or platforms relying 379 on older firmware without SBI HSM extension. All other platforms should 380 rely on ordered booting via SBI HSM extension which gets chosen 381 dynamically at runtime if the firmware supports it. 382 383config KEXEC 384 bool "Kexec system call" 385 select KEXEC_CORE 386 select HOTPLUG_CPU if SMP 387 depends on MMU 388 help 389 kexec is a system call that implements the ability to shutdown your 390 current kernel, and to start another kernel. It is like a reboot 391 but it is independent of the system firmware. And like a reboot 392 you can start any kernel with it, not just Linux. 393 394 The name comes from the similarity to the exec system call. 395 396config CRASH_DUMP 397 bool "Build kdump crash kernel" 398 help 399 Generate crash dump after being started by kexec. This should 400 be normally only set in special crash dump kernels which are 401 loaded in the main kernel with kexec-tools into a specially 402 reserved region and then later executed after a crash by 403 kdump/kexec. 404 405 For more details see Documentation/admin-guide/kdump/kdump.rst 406 407endmenu 408 409menu "Boot options" 410 411config CMDLINE 412 string "Built-in kernel command line" 413 help 414 For most platforms, the arguments for the kernel's command line 415 are provided at run-time, during boot. However, there are cases 416 where either no arguments are being provided or the provided 417 arguments are insufficient or even invalid. 418 419 When that occurs, it is possible to define a built-in command 420 line here and choose how the kernel should use it later on. 421 422choice 423 prompt "Built-in command line usage" if CMDLINE != "" 424 default CMDLINE_FALLBACK 425 help 426 Choose how the kernel will handle the provided built-in command 427 line. 428 429config CMDLINE_FALLBACK 430 bool "Use bootloader kernel arguments if available" 431 help 432 Use the built-in command line as fallback in case we get nothing 433 during boot. This is the default behaviour. 434 435config CMDLINE_EXTEND 436 bool "Extend bootloader kernel arguments" 437 help 438 The command-line arguments provided during boot will be 439 appended to the built-in command line. This is useful in 440 cases where the provided arguments are insufficient and 441 you don't want to or cannot modify them. 442 443 444config CMDLINE_FORCE 445 bool "Always use the default kernel command string" 446 help 447 Always use the built-in command line, even if we get one during 448 boot. This is useful in case you need to override the provided 449 command line on systems where you don't have or want control 450 over it. 451 452endchoice 453 454config EFI_STUB 455 bool 456 457config EFI 458 bool "UEFI runtime support" 459 depends on OF && !XIP_KERNEL 460 select LIBFDT 461 select UCS2_STRING 462 select EFI_PARAMS_FROM_FDT 463 select EFI_STUB 464 select EFI_GENERIC_STUB 465 select EFI_RUNTIME_WRAPPERS 466 select RISCV_ISA_C 467 depends on MMU 468 default y 469 help 470 This option provides support for runtime services provided 471 by UEFI firmware (such as non-volatile variables, realtime 472 clock, and platform reset). A UEFI stub is also provided to 473 allow the kernel to be booted as an EFI application. This 474 is only useful on systems that have UEFI firmware. 475 476config CC_HAVE_STACKPROTECTOR_TLS 477 def_bool $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=tp -mstack-protector-guard-offset=0) 478 479config STACKPROTECTOR_PER_TASK 480 def_bool y 481 depends on !GCC_PLUGIN_RANDSTRUCT 482 depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS 483 484config PHYS_RAM_BASE_FIXED 485 bool "Explicitly specified physical RAM address" 486 default n 487 488config PHYS_RAM_BASE 489 hex "Platform Physical RAM address" 490 depends on PHYS_RAM_BASE_FIXED 491 default "0x80000000" 492 help 493 This is the physical address of RAM in the system. It has to be 494 explicitly specified to run early relocations of read-write data 495 from flash to RAM. 496 497config XIP_KERNEL 498 bool "Kernel Execute-In-Place from ROM" 499 depends on MMU && SPARSEMEM 500 # This prevents XIP from being enabled by all{yes,mod}config, which 501 # fail to build since XIP doesn't support large kernels. 502 depends on !COMPILE_TEST 503 select PHYS_RAM_BASE_FIXED 504 help 505 Execute-In-Place allows the kernel to run from non-volatile storage 506 directly addressable by the CPU, such as NOR flash. This saves RAM 507 space since the text section of the kernel is not loaded from flash 508 to RAM. Read-write sections, such as the data section and stack, 509 are still copied to RAM. The XIP kernel is not compressed since 510 it has to run directly from flash, so it will take more space to 511 store it. The flash address used to link the kernel object files, 512 and for storing it, is configuration dependent. Therefore, if you 513 say Y here, you must know the proper physical address where to 514 store the kernel image depending on your own flash memory usage. 515 516 Also note that the make target becomes "make xipImage" rather than 517 "make zImage" or "make Image". The final kernel binary to put in 518 ROM memory will be arch/riscv/boot/xipImage. 519 520 SPARSEMEM is required because the kernel text and rodata that are 521 flash resident are not backed by memmap, then any attempt to get 522 a struct page on those regions will trigger a fault. 523 524 If unsure, say N. 525 526config XIP_PHYS_ADDR 527 hex "XIP Kernel Physical Location" 528 depends on XIP_KERNEL 529 default "0x21000000" 530 help 531 This is the physical address in your flash memory the kernel will 532 be linked for and stored to. This address is dependent on your 533 own flash usage. 534 535endmenu 536 537config BUILTIN_DTB 538 bool 539 depends on OF 540 default y if XIP_KERNEL 541 542menu "Power management options" 543 544source "kernel/power/Kconfig" 545 546endmenu 547 548source "arch/riscv/kvm/Kconfig" 549