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_HAS_BINFMT_FLAT 18 select ARCH_HAS_DEBUG_VM_PGTABLE 19 select ARCH_HAS_DEBUG_VIRTUAL if MMU 20 select ARCH_HAS_DEBUG_WX 21 select ARCH_HAS_FORTIFY_SOURCE 22 select ARCH_HAS_GCOV_PROFILE_ALL 23 select ARCH_HAS_GIGANTIC_PAGE 24 select ARCH_HAS_KCOV 25 select ARCH_HAS_MMIOWB 26 select ARCH_HAS_PTE_SPECIAL 27 select ARCH_HAS_SET_DIRECT_MAP if MMU 28 select ARCH_HAS_SET_MEMORY if MMU 29 select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL 30 select ARCH_HAS_STRICT_MODULE_RWX if MMU && !XIP_KERNEL 31 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 32 select ARCH_HAS_UBSAN_SANITIZE_ALL 33 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX 34 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT 35 select ARCH_STACKWALK 36 select ARCH_SUPPORTS_ATOMIC_RMW 37 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if MMU 38 select ARCH_SUPPORTS_HUGETLBFS if MMU 39 select ARCH_USE_MEMTEST 40 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU 41 select ARCH_WANT_FRAME_POINTERS 42 select ARCH_WANT_HUGE_PMD_SHARE if 64BIT 43 select BINFMT_FLAT_NO_DATA_START_OFFSET if !MMU 44 select BUILDTIME_TABLE_SORT if MMU 45 select CLONE_BACKWARDS 46 select CLINT_TIMER if !MMU 47 select COMMON_CLK 48 select EDAC_SUPPORT 49 select GENERIC_ARCH_TOPOLOGY if SMP 50 select GENERIC_ATOMIC64 if !64BIT 51 select GENERIC_CLOCKEVENTS_BROADCAST if SMP 52 select GENERIC_EARLY_IOREMAP 53 select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO 54 select GENERIC_IDLE_POLL_SETUP 55 select GENERIC_IOREMAP if MMU 56 select GENERIC_IRQ_MULTI_HANDLER 57 select GENERIC_IRQ_SHOW 58 select GENERIC_IRQ_SHOW_LEVEL 59 select GENERIC_LIB_DEVMEM_IS_ALLOWED 60 select GENERIC_PCI_IOMAP 61 select GENERIC_PTDUMP if MMU 62 select GENERIC_SCHED_CLOCK 63 select GENERIC_SMP_IDLE_THREAD 64 select GENERIC_TIME_VSYSCALL if MMU && 64BIT 65 select HAVE_ARCH_AUDITSYSCALL 66 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL 67 select HAVE_ARCH_JUMP_LABEL_RELATIVE if !XIP_KERNEL 68 select HAVE_ARCH_KASAN if MMU && 64BIT 69 select HAVE_ARCH_KASAN_VMALLOC if MMU && 64BIT 70 select HAVE_ARCH_KFENCE if MMU && 64BIT 71 select HAVE_ARCH_KGDB if !XIP_KERNEL 72 select HAVE_ARCH_KGDB_QXFER_PKT 73 select HAVE_ARCH_MMAP_RND_BITS if MMU 74 select HAVE_ARCH_SECCOMP_FILTER 75 select HAVE_ARCH_TRACEHOOK 76 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT && MMU 77 select HAVE_ARCH_THREAD_STRUCT_WHITELIST 78 select HAVE_ARCH_VMAP_STACK if MMU && 64BIT 79 select HAVE_ASM_MODVERSIONS 80 select HAVE_CONTEXT_TRACKING 81 select HAVE_DEBUG_KMEMLEAK 82 select HAVE_DMA_CONTIGUOUS if MMU 83 select HAVE_EBPF_JIT if MMU 84 select HAVE_FUNCTION_ERROR_INJECTION 85 select HAVE_FUTEX_CMPXCHG if FUTEX 86 select HAVE_GCC_PLUGINS 87 select HAVE_GENERIC_VDSO if MMU && 64BIT 88 select HAVE_IRQ_TIME_ACCOUNTING 89 select HAVE_KPROBES if !XIP_KERNEL 90 select HAVE_KPROBES_ON_FTRACE if !XIP_KERNEL 91 select HAVE_KRETPROBES if !XIP_KERNEL 92 select HAVE_MOVE_PMD 93 select HAVE_MOVE_PUD 94 select HAVE_PCI 95 select HAVE_PERF_EVENTS 96 select HAVE_PERF_REGS 97 select HAVE_PERF_USER_STACK_DUMP 98 select HAVE_REGS_AND_STACK_ACCESS_API 99 select HAVE_FUNCTION_ARG_ACCESS_API 100 select HAVE_STACKPROTECTOR 101 select HAVE_SYSCALL_TRACEPOINTS 102 select IRQ_DOMAIN 103 select IRQ_FORCED_THREADING 104 select MODULES_USE_ELF_RELA if MODULES 105 select MODULE_SECTIONS if MODULES 106 select OF 107 select OF_EARLY_FLATTREE 108 select OF_IRQ 109 select PCI_DOMAINS_GENERIC if PCI 110 select PCI_MSI if PCI 111 select RISCV_INTC 112 select RISCV_TIMER if RISCV_SBI 113 select SPARSE_IRQ 114 select SYSCTL_EXCEPTION_TRACE 115 select THREAD_INFO_IN_TASK 116 select TRACE_IRQFLAGS_SUPPORT 117 select UACCESS_MEMCPY if !MMU 118 select ZONE_DMA32 if 64BIT 119 120config ARCH_MMAP_RND_BITS_MIN 121 default 18 if 64BIT 122 default 8 123 124# max bits determined by the following formula: 125# VA_BITS - PAGE_SHIFT - 3 126config ARCH_MMAP_RND_BITS_MAX 127 default 24 if 64BIT # SV39 based 128 default 17 129 130# set if we run in machine mode, cleared if we run in supervisor mode 131config RISCV_M_MODE 132 bool 133 default !MMU 134 135# set if we are running in S-mode and can use SBI calls 136config RISCV_SBI 137 bool 138 depends on !RISCV_M_MODE 139 default y 140 141config MMU 142 bool "MMU-based Paged Memory Management Support" 143 default y 144 help 145 Select if you want MMU-based virtualised addressing space 146 support by paged memory management. If unsure, say 'Y'. 147 148config VA_BITS 149 int 150 default 32 if 32BIT 151 default 39 if 64BIT 152 153config PA_BITS 154 int 155 default 34 if 32BIT 156 default 56 if 64BIT 157 158config PAGE_OFFSET 159 hex 160 default 0xC0000000 if 32BIT && MAXPHYSMEM_1GB 161 default 0x80000000 if 64BIT && !MMU 162 default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB 163 default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB 164 165config KASAN_SHADOW_OFFSET 166 hex 167 depends on KASAN_GENERIC 168 default 0xdfffffc800000000 if 64BIT 169 default 0xffffffff if 32BIT 170 171config ARCH_FLATMEM_ENABLE 172 def_bool !NUMA 173 174config ARCH_SPARSEMEM_ENABLE 175 def_bool y 176 depends on MMU 177 select SPARSEMEM_STATIC if 32BIT && SPARSEMEM 178 select SPARSEMEM_VMEMMAP_ENABLE if 64BIT 179 180config ARCH_SELECT_MEMORY_MODEL 181 def_bool ARCH_SPARSEMEM_ENABLE 182 183config ARCH_WANT_GENERAL_HUGETLB 184 def_bool y 185 186config ARCH_SUPPORTS_UPROBES 187 def_bool y 188 189config STACKTRACE_SUPPORT 190 def_bool y 191 192config GENERIC_BUG 193 def_bool y 194 depends on BUG 195 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT 196 197config GENERIC_BUG_RELATIVE_POINTERS 198 bool 199 200config GENERIC_CALIBRATE_DELAY 201 def_bool y 202 203config GENERIC_CSUM 204 def_bool y 205 206config GENERIC_HWEIGHT 207 def_bool y 208 209config FIX_EARLYCON_MEM 210 def_bool MMU 211 212config PGTABLE_LEVELS 213 int 214 default 3 if 64BIT 215 default 2 216 217config LOCKDEP_SUPPORT 218 def_bool y 219 220source "arch/riscv/Kconfig.socs" 221source "arch/riscv/Kconfig.erratas" 222 223menu "Platform type" 224 225choice 226 prompt "Base ISA" 227 default ARCH_RV64I 228 help 229 This selects the base ISA that this kernel will target and must match 230 the target platform. 231 232config ARCH_RV32I 233 bool "RV32I" 234 select 32BIT 235 select GENERIC_LIB_ASHLDI3 236 select GENERIC_LIB_ASHRDI3 237 select GENERIC_LIB_LSHRDI3 238 select GENERIC_LIB_UCMPDI2 239 select MMU 240 241config ARCH_RV64I 242 bool "RV64I" 243 select 64BIT 244 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 245 select HAVE_DYNAMIC_FTRACE if !XIP_KERNEL && MMU && $(cc-option,-fpatchable-function-entry=8) 246 select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE 247 select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL 248 select HAVE_FUNCTION_GRAPH_TRACER 249 select HAVE_FUNCTION_TRACER if !XIP_KERNEL 250 select SWIOTLB if MMU 251 252endchoice 253 254# We must be able to map all physical memory into the kernel, but the compiler 255# is still a bit more efficient when generating code if it's setup in a manner 256# such that it can only map 2GiB of memory. 257choice 258 prompt "Kernel Code Model" 259 default CMODEL_MEDLOW if 32BIT 260 default CMODEL_MEDANY if 64BIT 261 262 config CMODEL_MEDLOW 263 bool "medium low code model" 264 config CMODEL_MEDANY 265 bool "medium any code model" 266endchoice 267 268config MODULE_SECTIONS 269 bool 270 select HAVE_MOD_ARCH_SPECIFIC 271 272choice 273 prompt "Maximum Physical Memory" 274 default MAXPHYSMEM_1GB if 32BIT 275 default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW 276 default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY 277 278 config MAXPHYSMEM_1GB 279 depends on 32BIT 280 bool "1GiB" 281 config MAXPHYSMEM_2GB 282 depends on 64BIT && CMODEL_MEDLOW 283 bool "2GiB" 284 config MAXPHYSMEM_128GB 285 depends on 64BIT && CMODEL_MEDANY 286 bool "128GiB" 287endchoice 288 289 290config SMP 291 bool "Symmetric Multi-Processing" 292 help 293 This enables support for systems with more than one CPU. If 294 you say N here, the kernel will run on single and 295 multiprocessor machines, but will use only one CPU of a 296 multiprocessor machine. If you say Y here, the kernel will run 297 on many, but not all, single processor machines. On a single 298 processor machine, the kernel will run faster if you say N 299 here. 300 301 If you don't know what to do here, say N. 302 303config NR_CPUS 304 int "Maximum number of CPUs (2-32)" 305 range 2 32 306 depends on SMP 307 default "8" 308 309config HOTPLUG_CPU 310 bool "Support for hot-pluggable CPUs" 311 depends on SMP 312 select GENERIC_IRQ_MIGRATION 313 help 314 315 Say Y here to experiment with turning CPUs off and on. CPUs 316 can be controlled through /sys/devices/system/cpu. 317 318 Say N if you want to disable CPU hotplug. 319 320choice 321 prompt "CPU Tuning" 322 default TUNE_GENERIC 323 324config TUNE_GENERIC 325 bool "generic" 326 327endchoice 328 329# Common NUMA Features 330config NUMA 331 bool "NUMA Memory Allocation and Scheduler Support" 332 depends on SMP && MMU 333 select GENERIC_ARCH_NUMA 334 select OF_NUMA 335 select ARCH_SUPPORTS_NUMA_BALANCING 336 help 337 Enable NUMA (Non-Uniform Memory Access) support. 338 339 The kernel will try to allocate memory used by a CPU on the 340 local memory of the CPU and add some more NUMA awareness to the kernel. 341 342config NODES_SHIFT 343 int "Maximum NUMA Nodes (as a power of 2)" 344 range 1 10 345 default "2" 346 depends on NUMA 347 help 348 Specify the maximum number of NUMA Nodes available on the target 349 system. Increases memory reserved to accommodate various tables. 350 351config USE_PERCPU_NUMA_NODE_ID 352 def_bool y 353 depends on NUMA 354 355config NEED_PER_CPU_EMBED_FIRST_CHUNK 356 def_bool y 357 depends on NUMA 358 359config RISCV_ISA_C 360 bool "Emit compressed instructions when building Linux" 361 default y 362 help 363 Adds "C" to the ISA subsets that the toolchain is allowed to emit 364 when building Linux, which results in compressed instructions in the 365 Linux binary. 366 367 If you don't know what to do here, say Y. 368 369menu "supported PMU type" 370 depends on PERF_EVENTS 371 372config RISCV_BASE_PMU 373 bool "Base Performance Monitoring Unit" 374 def_bool y 375 help 376 A base PMU that serves as a reference implementation and has limited 377 feature of perf. It can run on any RISC-V machines so serves as the 378 fallback, but this option can also be disable to reduce kernel size. 379 380endmenu 381 382config FPU 383 bool "FPU support" 384 default y 385 help 386 Say N here if you want to disable all floating-point related procedure 387 in the kernel. 388 389 If you don't know what to do here, say Y. 390 391endmenu 392 393menu "Kernel features" 394 395source "kernel/Kconfig.hz" 396 397config RISCV_SBI_V01 398 bool "SBI v0.1 support" 399 default y 400 depends on RISCV_SBI 401 help 402 This config allows kernel to use SBI v0.1 APIs. This will be 403 deprecated in future once legacy M-mode software are no longer in use. 404 405config KEXEC 406 bool "Kexec system call" 407 select KEXEC_CORE 408 select HOTPLUG_CPU if SMP 409 depends on MMU 410 help 411 kexec is a system call that implements the ability to shutdown your 412 current kernel, and to start another kernel. It is like a reboot 413 but it is independent of the system firmware. And like a reboot 414 you can start any kernel with it, not just Linux. 415 416 The name comes from the similarity to the exec system call. 417 418config CRASH_DUMP 419 bool "Build kdump crash kernel" 420 help 421 Generate crash dump after being started by kexec. This should 422 be normally only set in special crash dump kernels which are 423 loaded in the main kernel with kexec-tools into a specially 424 reserved region and then later executed after a crash by 425 kdump/kexec. 426 427 For more details see Documentation/admin-guide/kdump/kdump.rst 428 429endmenu 430 431menu "Boot options" 432 433config CMDLINE 434 string "Built-in kernel command line" 435 help 436 For most platforms, the arguments for the kernel's command line 437 are provided at run-time, during boot. However, there are cases 438 where either no arguments are being provided or the provided 439 arguments are insufficient or even invalid. 440 441 When that occurs, it is possible to define a built-in command 442 line here and choose how the kernel should use it later on. 443 444choice 445 prompt "Built-in command line usage" if CMDLINE != "" 446 default CMDLINE_FALLBACK 447 help 448 Choose how the kernel will handle the provided built-in command 449 line. 450 451config CMDLINE_FALLBACK 452 bool "Use bootloader kernel arguments if available" 453 help 454 Use the built-in command line as fallback in case we get nothing 455 during boot. This is the default behaviour. 456 457config CMDLINE_EXTEND 458 bool "Extend bootloader kernel arguments" 459 help 460 The command-line arguments provided during boot will be 461 appended to the built-in command line. This is useful in 462 cases where the provided arguments are insufficient and 463 you don't want to or cannot modify them. 464 465 466config CMDLINE_FORCE 467 bool "Always use the default kernel command string" 468 help 469 Always use the built-in command line, even if we get one during 470 boot. This is useful in case you need to override the provided 471 command line on systems where you don't have or want control 472 over it. 473 474endchoice 475 476config EFI_STUB 477 bool 478 479config EFI 480 bool "UEFI runtime support" 481 depends on OF && !XIP_KERNEL 482 select LIBFDT 483 select UCS2_STRING 484 select EFI_PARAMS_FROM_FDT 485 select EFI_STUB 486 select EFI_GENERIC_STUB 487 select EFI_RUNTIME_WRAPPERS 488 select RISCV_ISA_C 489 depends on MMU 490 default y 491 help 492 This option provides support for runtime services provided 493 by UEFI firmware (such as non-volatile variables, realtime 494 clock, and platform reset). A UEFI stub is also provided to 495 allow the kernel to be booted as an EFI application. This 496 is only useful on systems that have UEFI firmware. 497 498config CC_HAVE_STACKPROTECTOR_TLS 499 def_bool $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=tp -mstack-protector-guard-offset=0) 500 501config STACKPROTECTOR_PER_TASK 502 def_bool y 503 depends on !GCC_PLUGIN_RANDSTRUCT 504 depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS 505 506config PHYS_RAM_BASE_FIXED 507 bool "Explicitly specified physical RAM address" 508 default n 509 510config PHYS_RAM_BASE 511 hex "Platform Physical RAM address" 512 depends on PHYS_RAM_BASE_FIXED 513 default "0x80000000" 514 help 515 This is the physical address of RAM in the system. It has to be 516 explicitly specified to run early relocations of read-write data 517 from flash to RAM. 518 519config XIP_KERNEL 520 bool "Kernel Execute-In-Place from ROM" 521 depends on MMU && SPARSEMEM 522 # This prevents XIP from being enabled by all{yes,mod}config, which 523 # fail to build since XIP doesn't support large kernels. 524 depends on !COMPILE_TEST 525 select PHYS_RAM_BASE_FIXED 526 help 527 Execute-In-Place allows the kernel to run from non-volatile storage 528 directly addressable by the CPU, such as NOR flash. This saves RAM 529 space since the text section of the kernel is not loaded from flash 530 to RAM. Read-write sections, such as the data section and stack, 531 are still copied to RAM. The XIP kernel is not compressed since 532 it has to run directly from flash, so it will take more space to 533 store it. The flash address used to link the kernel object files, 534 and for storing it, is configuration dependent. Therefore, if you 535 say Y here, you must know the proper physical address where to 536 store the kernel image depending on your own flash memory usage. 537 538 Also note that the make target becomes "make xipImage" rather than 539 "make zImage" or "make Image". The final kernel binary to put in 540 ROM memory will be arch/riscv/boot/xipImage. 541 542 SPARSEMEM is required because the kernel text and rodata that are 543 flash resident are not backed by memmap, then any attempt to get 544 a struct page on those regions will trigger a fault. 545 546 If unsure, say N. 547 548config XIP_PHYS_ADDR 549 hex "XIP Kernel Physical Location" 550 depends on XIP_KERNEL 551 default "0x21000000" 552 help 553 This is the physical address in your flash memory the kernel will 554 be linked for and stored to. This address is dependent on your 555 own flash usage. 556 557endmenu 558 559config BUILTIN_DTB 560 bool 561 depends on OF 562 default y if XIP_KERNEL 563 564menu "Power management options" 565 566source "kernel/power/Kconfig" 567 568endmenu 569 570source "arch/riscv/kvm/Kconfig" 571