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