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_FUTEX_CMPXCHG if FUTEX 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 VA_BITS 152 int 153 default 32 if 32BIT 154 default 39 if 64BIT 155 156config PA_BITS 157 int 158 default 34 if 32BIT 159 default 56 if 64BIT 160 161config PAGE_OFFSET 162 hex 163 default 0xC0000000 if 32BIT && MAXPHYSMEM_1GB 164 default 0x80000000 if 64BIT && !MMU 165 default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB 166 default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB 167 168config KASAN_SHADOW_OFFSET 169 hex 170 depends on KASAN_GENERIC 171 default 0xdfffffc800000000 if 64BIT 172 default 0xffffffff if 32BIT 173 174config ARCH_FLATMEM_ENABLE 175 def_bool !NUMA 176 177config ARCH_SPARSEMEM_ENABLE 178 def_bool y 179 depends on MMU 180 select SPARSEMEM_STATIC if 32BIT && SPARSEMEM 181 select SPARSEMEM_VMEMMAP_ENABLE if 64BIT 182 183config ARCH_SELECT_MEMORY_MODEL 184 def_bool ARCH_SPARSEMEM_ENABLE 185 186config ARCH_WANT_GENERAL_HUGETLB 187 def_bool y 188 189config ARCH_SUPPORTS_UPROBES 190 def_bool y 191 192config STACKTRACE_SUPPORT 193 def_bool y 194 195config GENERIC_BUG 196 def_bool y 197 depends on BUG 198 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT 199 200config GENERIC_BUG_RELATIVE_POINTERS 201 bool 202 203config GENERIC_CALIBRATE_DELAY 204 def_bool y 205 206config GENERIC_CSUM 207 def_bool y 208 209config GENERIC_HWEIGHT 210 def_bool y 211 212config FIX_EARLYCON_MEM 213 def_bool MMU 214 215config PGTABLE_LEVELS 216 int 217 default 3 if 64BIT 218 default 2 219 220config LOCKDEP_SUPPORT 221 def_bool y 222 223source "arch/riscv/Kconfig.socs" 224source "arch/riscv/Kconfig.erratas" 225 226menu "Platform type" 227 228choice 229 prompt "Base ISA" 230 default ARCH_RV64I 231 help 232 This selects the base ISA that this kernel will target and must match 233 the target platform. 234 235config ARCH_RV32I 236 bool "RV32I" 237 select 32BIT 238 select GENERIC_LIB_ASHLDI3 239 select GENERIC_LIB_ASHRDI3 240 select GENERIC_LIB_LSHRDI3 241 select GENERIC_LIB_UCMPDI2 242 select MMU 243 244config ARCH_RV64I 245 bool "RV64I" 246 select 64BIT 247 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 248 select HAVE_DYNAMIC_FTRACE if !XIP_KERNEL && MMU && $(cc-option,-fpatchable-function-entry=8) 249 select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE 250 select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL 251 select HAVE_FUNCTION_GRAPH_TRACER 252 select HAVE_FUNCTION_TRACER if !XIP_KERNEL 253 select SWIOTLB if MMU 254 255endchoice 256 257# We must be able to map all physical memory into the kernel, but the compiler 258# is still a bit more efficient when generating code if it's setup in a manner 259# such that it can only map 2GiB of memory. 260choice 261 prompt "Kernel Code Model" 262 default CMODEL_MEDLOW if 32BIT 263 default CMODEL_MEDANY if 64BIT 264 265 config CMODEL_MEDLOW 266 bool "medium low code model" 267 config CMODEL_MEDANY 268 bool "medium any code model" 269endchoice 270 271config MODULE_SECTIONS 272 bool 273 select HAVE_MOD_ARCH_SPECIFIC 274 275choice 276 prompt "Maximum Physical Memory" 277 default MAXPHYSMEM_1GB if 32BIT 278 default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW 279 default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY 280 281 config MAXPHYSMEM_1GB 282 depends on 32BIT 283 bool "1GiB" 284 config MAXPHYSMEM_2GB 285 depends on 64BIT 286 bool "2GiB" 287 config MAXPHYSMEM_128GB 288 depends on 64BIT && CMODEL_MEDANY 289 bool "128GiB" 290endchoice 291 292 293config SMP 294 bool "Symmetric Multi-Processing" 295 help 296 This enables support for systems with more than one CPU. If 297 you say N here, the kernel will run on single and 298 multiprocessor machines, but will use only one CPU of a 299 multiprocessor machine. If you say Y here, the kernel will run 300 on many, but not all, single processor machines. On a single 301 processor machine, the kernel will run faster if you say N 302 here. 303 304 If you don't know what to do here, say N. 305 306config NR_CPUS 307 int "Maximum number of CPUs (2-32)" 308 range 2 32 309 depends on SMP 310 default "8" 311 312config HOTPLUG_CPU 313 bool "Support for hot-pluggable CPUs" 314 depends on SMP 315 select GENERIC_IRQ_MIGRATION 316 help 317 318 Say Y here to experiment with turning CPUs off and on. CPUs 319 can be controlled through /sys/devices/system/cpu. 320 321 Say N if you want to disable CPU hotplug. 322 323choice 324 prompt "CPU Tuning" 325 default TUNE_GENERIC 326 327config TUNE_GENERIC 328 bool "generic" 329 330endchoice 331 332# Common NUMA Features 333config NUMA 334 bool "NUMA Memory Allocation and Scheduler Support" 335 depends on SMP && MMU 336 select GENERIC_ARCH_NUMA 337 select OF_NUMA 338 select ARCH_SUPPORTS_NUMA_BALANCING 339 help 340 Enable NUMA (Non-Uniform Memory Access) support. 341 342 The kernel will try to allocate memory used by a CPU on the 343 local memory of the CPU and add some more NUMA awareness to the kernel. 344 345config NODES_SHIFT 346 int "Maximum NUMA Nodes (as a power of 2)" 347 range 1 10 348 default "2" 349 depends on NUMA 350 help 351 Specify the maximum number of NUMA Nodes available on the target 352 system. Increases memory reserved to accommodate various tables. 353 354config USE_PERCPU_NUMA_NODE_ID 355 def_bool y 356 depends on NUMA 357 358config NEED_PER_CPU_EMBED_FIRST_CHUNK 359 def_bool y 360 depends on NUMA 361 362config RISCV_ISA_C 363 bool "Emit compressed instructions when building Linux" 364 default y 365 help 366 Adds "C" to the ISA subsets that the toolchain is allowed to emit 367 when building Linux, which results in compressed instructions in the 368 Linux binary. 369 370 If you don't know what to do here, say Y. 371 372menu "supported PMU type" 373 depends on PERF_EVENTS 374 375config RISCV_BASE_PMU 376 bool "Base Performance Monitoring Unit" 377 def_bool y 378 help 379 A base PMU that serves as a reference implementation and has limited 380 feature of perf. It can run on any RISC-V machines so serves as the 381 fallback, but this option can also be disable to reduce kernel size. 382 383endmenu 384 385config FPU 386 bool "FPU support" 387 default y 388 help 389 Say N here if you want to disable all floating-point related procedure 390 in the kernel. 391 392 If you don't know what to do here, say Y. 393 394endmenu 395 396menu "Kernel features" 397 398source "kernel/Kconfig.hz" 399 400config RISCV_SBI_V01 401 bool "SBI v0.1 support" 402 default y 403 depends on RISCV_SBI 404 help 405 This config allows kernel to use SBI v0.1 APIs. This will be 406 deprecated in future once legacy M-mode software are no longer in use. 407 408config KEXEC 409 bool "Kexec system call" 410 select KEXEC_CORE 411 select HOTPLUG_CPU if SMP 412 depends on MMU 413 help 414 kexec is a system call that implements the ability to shutdown your 415 current kernel, and to start another kernel. It is like a reboot 416 but it is independent of the system firmware. And like a reboot 417 you can start any kernel with it, not just Linux. 418 419 The name comes from the similarity to the exec system call. 420 421config CRASH_DUMP 422 bool "Build kdump crash kernel" 423 help 424 Generate crash dump after being started by kexec. This should 425 be normally only set in special crash dump kernels which are 426 loaded in the main kernel with kexec-tools into a specially 427 reserved region and then later executed after a crash by 428 kdump/kexec. 429 430 For more details see Documentation/admin-guide/kdump/kdump.rst 431 432endmenu 433 434menu "Boot options" 435 436config CMDLINE 437 string "Built-in kernel command line" 438 help 439 For most platforms, the arguments for the kernel's command line 440 are provided at run-time, during boot. However, there are cases 441 where either no arguments are being provided or the provided 442 arguments are insufficient or even invalid. 443 444 When that occurs, it is possible to define a built-in command 445 line here and choose how the kernel should use it later on. 446 447choice 448 prompt "Built-in command line usage" if CMDLINE != "" 449 default CMDLINE_FALLBACK 450 help 451 Choose how the kernel will handle the provided built-in command 452 line. 453 454config CMDLINE_FALLBACK 455 bool "Use bootloader kernel arguments if available" 456 help 457 Use the built-in command line as fallback in case we get nothing 458 during boot. This is the default behaviour. 459 460config CMDLINE_EXTEND 461 bool "Extend bootloader kernel arguments" 462 help 463 The command-line arguments provided during boot will be 464 appended to the built-in command line. This is useful in 465 cases where the provided arguments are insufficient and 466 you don't want to or cannot modify them. 467 468 469config CMDLINE_FORCE 470 bool "Always use the default kernel command string" 471 help 472 Always use the built-in command line, even if we get one during 473 boot. This is useful in case you need to override the provided 474 command line on systems where you don't have or want control 475 over it. 476 477endchoice 478 479config EFI_STUB 480 bool 481 482config EFI 483 bool "UEFI runtime support" 484 depends on OF && !XIP_KERNEL 485 select LIBFDT 486 select UCS2_STRING 487 select EFI_PARAMS_FROM_FDT 488 select EFI_STUB 489 select EFI_GENERIC_STUB 490 select EFI_RUNTIME_WRAPPERS 491 select RISCV_ISA_C 492 depends on MMU 493 default y 494 help 495 This option provides support for runtime services provided 496 by UEFI firmware (such as non-volatile variables, realtime 497 clock, and platform reset). A UEFI stub is also provided to 498 allow the kernel to be booted as an EFI application. This 499 is only useful on systems that have UEFI firmware. 500 501config CC_HAVE_STACKPROTECTOR_TLS 502 def_bool $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=tp -mstack-protector-guard-offset=0) 503 504config STACKPROTECTOR_PER_TASK 505 def_bool y 506 depends on !GCC_PLUGIN_RANDSTRUCT 507 depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS 508 509config PHYS_RAM_BASE_FIXED 510 bool "Explicitly specified physical RAM address" 511 default n 512 513config PHYS_RAM_BASE 514 hex "Platform Physical RAM address" 515 depends on PHYS_RAM_BASE_FIXED 516 default "0x80000000" 517 help 518 This is the physical address of RAM in the system. It has to be 519 explicitly specified to run early relocations of read-write data 520 from flash to RAM. 521 522config XIP_KERNEL 523 bool "Kernel Execute-In-Place from ROM" 524 depends on MMU && SPARSEMEM 525 # This prevents XIP from being enabled by all{yes,mod}config, which 526 # fail to build since XIP doesn't support large kernels. 527 depends on !COMPILE_TEST 528 select PHYS_RAM_BASE_FIXED 529 help 530 Execute-In-Place allows the kernel to run from non-volatile storage 531 directly addressable by the CPU, such as NOR flash. This saves RAM 532 space since the text section of the kernel is not loaded from flash 533 to RAM. Read-write sections, such as the data section and stack, 534 are still copied to RAM. The XIP kernel is not compressed since 535 it has to run directly from flash, so it will take more space to 536 store it. The flash address used to link the kernel object files, 537 and for storing it, is configuration dependent. Therefore, if you 538 say Y here, you must know the proper physical address where to 539 store the kernel image depending on your own flash memory usage. 540 541 Also note that the make target becomes "make xipImage" rather than 542 "make zImage" or "make Image". The final kernel binary to put in 543 ROM memory will be arch/riscv/boot/xipImage. 544 545 SPARSEMEM is required because the kernel text and rodata that are 546 flash resident are not backed by memmap, then any attempt to get 547 a struct page on those regions will trigger a fault. 548 549 If unsure, say N. 550 551config XIP_PHYS_ADDR 552 hex "XIP Kernel Physical Location" 553 depends on XIP_KERNEL 554 default "0x21000000" 555 help 556 This is the physical address in your flash memory the kernel will 557 be linked for and stored to. This address is dependent on your 558 own flash usage. 559 560endmenu 561 562config BUILTIN_DTB 563 bool 564 depends on OF 565 default y if XIP_KERNEL 566 567menu "Power management options" 568 569source "kernel/power/Kconfig" 570 571endmenu 572 573source "arch/riscv/kvm/Kconfig" 574