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 PAGE_OFFSET 151 hex 152 default 0xC0000000 if 32BIT 153 default 0x80000000 if 64BIT && !MMU 154 default 0xffffaf8000000000 if 64BIT 155 156config KASAN_SHADOW_OFFSET 157 hex 158 depends on KASAN_GENERIC 159 default 0xdfffffff00000000 if 64BIT 160 default 0xffffffff if 32BIT 161 162config ARCH_FLATMEM_ENABLE 163 def_bool !NUMA 164 165config ARCH_SPARSEMEM_ENABLE 166 def_bool y 167 depends on MMU 168 select SPARSEMEM_STATIC if 32BIT && SPARSEMEM 169 select SPARSEMEM_VMEMMAP_ENABLE if 64BIT 170 171config ARCH_SELECT_MEMORY_MODEL 172 def_bool ARCH_SPARSEMEM_ENABLE 173 174config ARCH_WANT_GENERAL_HUGETLB 175 def_bool y 176 177config ARCH_SUPPORTS_UPROBES 178 def_bool y 179 180config STACKTRACE_SUPPORT 181 def_bool y 182 183config GENERIC_BUG 184 def_bool y 185 depends on BUG 186 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT 187 188config GENERIC_BUG_RELATIVE_POINTERS 189 bool 190 191config GENERIC_CALIBRATE_DELAY 192 def_bool y 193 194config GENERIC_CSUM 195 def_bool y 196 197config GENERIC_HWEIGHT 198 def_bool y 199 200config FIX_EARLYCON_MEM 201 def_bool MMU 202 203config PGTABLE_LEVELS 204 int 205 default 4 if 64BIT 206 default 2 207 208config LOCKDEP_SUPPORT 209 def_bool y 210 211source "arch/riscv/Kconfig.socs" 212source "arch/riscv/Kconfig.erratas" 213 214menu "Platform type" 215 216choice 217 prompt "Base ISA" 218 default ARCH_RV64I 219 help 220 This selects the base ISA that this kernel will target and must match 221 the target platform. 222 223config ARCH_RV32I 224 bool "RV32I" 225 select 32BIT 226 select GENERIC_LIB_ASHLDI3 227 select GENERIC_LIB_ASHRDI3 228 select GENERIC_LIB_LSHRDI3 229 select GENERIC_LIB_UCMPDI2 230 select MMU 231 232config ARCH_RV64I 233 bool "RV64I" 234 select 64BIT 235 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 236 select HAVE_DYNAMIC_FTRACE if !XIP_KERNEL && MMU && $(cc-option,-fpatchable-function-entry=8) 237 select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE 238 select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL 239 select HAVE_FUNCTION_GRAPH_TRACER 240 select HAVE_FUNCTION_TRACER if !XIP_KERNEL 241 select SWIOTLB if MMU 242 243endchoice 244 245# We must be able to map all physical memory into the kernel, but the compiler 246# is still a bit more efficient when generating code if it's setup in a manner 247# such that it can only map 2GiB of memory. 248choice 249 prompt "Kernel Code Model" 250 default CMODEL_MEDLOW if 32BIT 251 default CMODEL_MEDANY if 64BIT 252 253 config CMODEL_MEDLOW 254 bool "medium low code model" 255 config CMODEL_MEDANY 256 bool "medium any code model" 257endchoice 258 259config MODULE_SECTIONS 260 bool 261 select HAVE_MOD_ARCH_SPECIFIC 262 263config SMP 264 bool "Symmetric Multi-Processing" 265 help 266 This enables support for systems with more than one CPU. If 267 you say N here, the kernel will run on single and 268 multiprocessor machines, but will use only one CPU of a 269 multiprocessor machine. If you say Y here, the kernel will run 270 on many, but not all, single processor machines. On a single 271 processor machine, the kernel will run faster if you say N 272 here. 273 274 If you don't know what to do here, say N. 275 276config NR_CPUS 277 int "Maximum number of CPUs (2-32)" 278 range 2 32 279 depends on SMP 280 default "8" 281 282config HOTPLUG_CPU 283 bool "Support for hot-pluggable CPUs" 284 depends on SMP 285 select GENERIC_IRQ_MIGRATION 286 help 287 288 Say Y here to experiment with turning CPUs off and on. CPUs 289 can be controlled through /sys/devices/system/cpu. 290 291 Say N if you want to disable CPU hotplug. 292 293choice 294 prompt "CPU Tuning" 295 default TUNE_GENERIC 296 297config TUNE_GENERIC 298 bool "generic" 299 300endchoice 301 302# Common NUMA Features 303config NUMA 304 bool "NUMA Memory Allocation and Scheduler Support" 305 depends on SMP && MMU 306 select GENERIC_ARCH_NUMA 307 select OF_NUMA 308 select ARCH_SUPPORTS_NUMA_BALANCING 309 select USE_PERCPU_NUMA_NODE_ID 310 select NEED_PER_CPU_EMBED_FIRST_CHUNK 311 help 312 Enable NUMA (Non-Uniform Memory Access) support. 313 314 The kernel will try to allocate memory used by a CPU on the 315 local memory of the CPU and add some more NUMA awareness to the kernel. 316 317config NODES_SHIFT 318 int "Maximum NUMA Nodes (as a power of 2)" 319 range 1 10 320 default "2" 321 depends on NUMA 322 help 323 Specify the maximum number of NUMA Nodes available on the target 324 system. Increases memory reserved to accommodate various tables. 325 326config RISCV_ISA_C 327 bool "Emit compressed instructions when building Linux" 328 default y 329 help 330 Adds "C" to the ISA subsets that the toolchain is allowed to emit 331 when building Linux, which results in compressed instructions in the 332 Linux binary. 333 334 If you don't know what to do here, say Y. 335 336menu "supported PMU type" 337 depends on PERF_EVENTS 338 339config RISCV_BASE_PMU 340 bool "Base Performance Monitoring Unit" 341 def_bool y 342 help 343 A base PMU that serves as a reference implementation and has limited 344 feature of perf. It can run on any RISC-V machines so serves as the 345 fallback, but this option can also be disable to reduce kernel size. 346 347endmenu 348 349config FPU 350 bool "FPU support" 351 default y 352 help 353 Say N here if you want to disable all floating-point related procedure 354 in the kernel. 355 356 If you don't know what to do here, say Y. 357 358endmenu 359 360menu "Kernel features" 361 362source "kernel/Kconfig.hz" 363 364config RISCV_SBI_V01 365 bool "SBI v0.1 support" 366 depends on RISCV_SBI 367 help 368 This config allows kernel to use SBI v0.1 APIs. This will be 369 deprecated in future once legacy M-mode software are no longer in use. 370 371config RISCV_BOOT_SPINWAIT 372 bool "Spinwait booting method" 373 depends on SMP 374 default y 375 help 376 This enables support for booting Linux via spinwait method. In the 377 spinwait method, all cores randomly jump to Linux. One of the cores 378 gets chosen via lottery and all other keep spinning on a percpu 379 variable. This method cannot support CPU hotplug and sparse hartid 380 scheme. It should be only enabled for M-mode Linux or platforms relying 381 on older firmware without SBI HSM extension. All other platforms should 382 rely on ordered booting via SBI HSM extension which gets chosen 383 dynamically at runtime if the firmware supports it. 384 385config KEXEC 386 bool "Kexec system call" 387 select KEXEC_CORE 388 select HOTPLUG_CPU if SMP 389 depends on MMU 390 help 391 kexec is a system call that implements the ability to shutdown your 392 current kernel, and to start another kernel. It is like a reboot 393 but it is independent of the system firmware. And like a reboot 394 you can start any kernel with it, not just Linux. 395 396 The name comes from the similarity to the exec system call. 397 398config CRASH_DUMP 399 bool "Build kdump crash kernel" 400 help 401 Generate crash dump after being started by kexec. This should 402 be normally only set in special crash dump kernels which are 403 loaded in the main kernel with kexec-tools into a specially 404 reserved region and then later executed after a crash by 405 kdump/kexec. 406 407 For more details see Documentation/admin-guide/kdump/kdump.rst 408 409endmenu 410 411menu "Boot options" 412 413config CMDLINE 414 string "Built-in kernel command line" 415 help 416 For most platforms, the arguments for the kernel's command line 417 are provided at run-time, during boot. However, there are cases 418 where either no arguments are being provided or the provided 419 arguments are insufficient or even invalid. 420 421 When that occurs, it is possible to define a built-in command 422 line here and choose how the kernel should use it later on. 423 424choice 425 prompt "Built-in command line usage" if CMDLINE != "" 426 default CMDLINE_FALLBACK 427 help 428 Choose how the kernel will handle the provided built-in command 429 line. 430 431config CMDLINE_FALLBACK 432 bool "Use bootloader kernel arguments if available" 433 help 434 Use the built-in command line as fallback in case we get nothing 435 during boot. This is the default behaviour. 436 437config CMDLINE_EXTEND 438 bool "Extend bootloader kernel arguments" 439 help 440 The command-line arguments provided during boot will be 441 appended to the built-in command line. This is useful in 442 cases where the provided arguments are insufficient and 443 you don't want to or cannot modify them. 444 445 446config CMDLINE_FORCE 447 bool "Always use the default kernel command string" 448 help 449 Always use the built-in command line, even if we get one during 450 boot. This is useful in case you need to override the provided 451 command line on systems where you don't have or want control 452 over it. 453 454endchoice 455 456config EFI_STUB 457 bool 458 459config EFI 460 bool "UEFI runtime support" 461 depends on OF && !XIP_KERNEL 462 select LIBFDT 463 select UCS2_STRING 464 select EFI_PARAMS_FROM_FDT 465 select EFI_STUB 466 select EFI_GENERIC_STUB 467 select EFI_RUNTIME_WRAPPERS 468 select RISCV_ISA_C 469 depends on MMU 470 default y 471 help 472 This option provides support for runtime services provided 473 by UEFI firmware (such as non-volatile variables, realtime 474 clock, and platform reset). A UEFI stub is also provided to 475 allow the kernel to be booted as an EFI application. This 476 is only useful on systems that have UEFI firmware. 477 478config CC_HAVE_STACKPROTECTOR_TLS 479 def_bool $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=tp -mstack-protector-guard-offset=0) 480 481config STACKPROTECTOR_PER_TASK 482 def_bool y 483 depends on !GCC_PLUGIN_RANDSTRUCT 484 depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS 485 486config PHYS_RAM_BASE_FIXED 487 bool "Explicitly specified physical RAM address" 488 default n 489 490config PHYS_RAM_BASE 491 hex "Platform Physical RAM address" 492 depends on PHYS_RAM_BASE_FIXED 493 default "0x80000000" 494 help 495 This is the physical address of RAM in the system. It has to be 496 explicitly specified to run early relocations of read-write data 497 from flash to RAM. 498 499config XIP_KERNEL 500 bool "Kernel Execute-In-Place from ROM" 501 depends on MMU && SPARSEMEM 502 # This prevents XIP from being enabled by all{yes,mod}config, which 503 # fail to build since XIP doesn't support large kernels. 504 depends on !COMPILE_TEST 505 select PHYS_RAM_BASE_FIXED 506 help 507 Execute-In-Place allows the kernel to run from non-volatile storage 508 directly addressable by the CPU, such as NOR flash. This saves RAM 509 space since the text section of the kernel is not loaded from flash 510 to RAM. Read-write sections, such as the data section and stack, 511 are still copied to RAM. The XIP kernel is not compressed since 512 it has to run directly from flash, so it will take more space to 513 store it. The flash address used to link the kernel object files, 514 and for storing it, is configuration dependent. Therefore, if you 515 say Y here, you must know the proper physical address where to 516 store the kernel image depending on your own flash memory usage. 517 518 Also note that the make target becomes "make xipImage" rather than 519 "make zImage" or "make Image". The final kernel binary to put in 520 ROM memory will be arch/riscv/boot/xipImage. 521 522 SPARSEMEM is required because the kernel text and rodata that are 523 flash resident are not backed by memmap, then any attempt to get 524 a struct page on those regions will trigger a fault. 525 526 If unsure, say N. 527 528config XIP_PHYS_ADDR 529 hex "XIP Kernel Physical Location" 530 depends on XIP_KERNEL 531 default "0x21000000" 532 help 533 This is the physical address in your flash memory the kernel will 534 be linked for and stored to. This address is dependent on your 535 own flash usage. 536 537endmenu 538 539config BUILTIN_DTB 540 bool 541 depends on OF 542 default y if XIP_KERNEL 543 544menu "Power management options" 545 546source "kernel/power/Kconfig" 547 548endmenu 549 550source "arch/riscv/kvm/Kconfig" 551