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_CURRENT_STACK_POINTER 20 select ARCH_HAS_DEBUG_VM_PGTABLE 21 select ARCH_HAS_DEBUG_VIRTUAL if MMU 22 select ARCH_HAS_DEBUG_WX 23 select ARCH_HAS_FORTIFY_SOURCE 24 select ARCH_HAS_GCOV_PROFILE_ALL 25 select ARCH_HAS_GIGANTIC_PAGE 26 select ARCH_HAS_KCOV 27 select ARCH_HAS_MMIOWB 28 select ARCH_HAS_PTE_SPECIAL 29 select ARCH_HAS_SET_DIRECT_MAP if MMU 30 select ARCH_HAS_SET_MEMORY if MMU 31 select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL 32 select ARCH_HAS_STRICT_MODULE_RWX if MMU && !XIP_KERNEL 33 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 34 select ARCH_HAS_UBSAN_SANITIZE_ALL 35 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX 36 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT 37 select ARCH_STACKWALK 38 select ARCH_SUPPORTS_ATOMIC_RMW 39 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if MMU 40 select ARCH_SUPPORTS_HUGETLBFS if MMU 41 select ARCH_USE_MEMTEST 42 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU 43 select ARCH_WANT_FRAME_POINTERS 44 select ARCH_WANT_GENERAL_HUGETLB 45 select ARCH_WANT_HUGE_PMD_SHARE if 64BIT 46 select BINFMT_FLAT_NO_DATA_START_OFFSET if !MMU 47 select BUILDTIME_TABLE_SORT if MMU 48 select CLONE_BACKWARDS 49 select CLINT_TIMER if !MMU 50 select COMMON_CLK 51 select CPU_PM if CPU_IDLE 52 select EDAC_SUPPORT 53 select GENERIC_ARCH_TOPOLOGY if SMP 54 select GENERIC_ATOMIC64 if !64BIT 55 select GENERIC_CLOCKEVENTS_BROADCAST if SMP 56 select GENERIC_EARLY_IOREMAP 57 select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO 58 select GENERIC_IDLE_POLL_SETUP 59 select GENERIC_IOREMAP if MMU 60 select GENERIC_IRQ_MULTI_HANDLER 61 select GENERIC_IRQ_SHOW 62 select GENERIC_IRQ_SHOW_LEVEL 63 select GENERIC_LIB_DEVMEM_IS_ALLOWED 64 select GENERIC_PCI_IOMAP 65 select GENERIC_PTDUMP if MMU 66 select GENERIC_SCHED_CLOCK 67 select GENERIC_SMP_IDLE_THREAD 68 select GENERIC_TIME_VSYSCALL if MMU && 64BIT 69 select GENERIC_VDSO_TIME_NS if HAVE_GENERIC_VDSO 70 select HAVE_ARCH_AUDITSYSCALL 71 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL 72 select HAVE_ARCH_JUMP_LABEL_RELATIVE if !XIP_KERNEL 73 select HAVE_ARCH_KASAN if MMU && 64BIT 74 select HAVE_ARCH_KASAN_VMALLOC if MMU && 64BIT 75 select HAVE_ARCH_KFENCE if MMU && 64BIT 76 select HAVE_ARCH_KGDB if !XIP_KERNEL 77 select HAVE_ARCH_KGDB_QXFER_PKT 78 select HAVE_ARCH_MMAP_RND_BITS if MMU 79 select HAVE_ARCH_SECCOMP_FILTER 80 select HAVE_ARCH_TRACEHOOK 81 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT && MMU 82 select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE 83 select HAVE_ARCH_THREAD_STRUCT_WHITELIST 84 select HAVE_ARCH_VMAP_STACK if MMU && 64BIT 85 select HAVE_ASM_MODVERSIONS 86 select HAVE_CONTEXT_TRACKING 87 select HAVE_DEBUG_KMEMLEAK 88 select HAVE_DMA_CONTIGUOUS if MMU 89 select HAVE_EBPF_JIT if MMU 90 select HAVE_FUNCTION_ERROR_INJECTION 91 select HAVE_GCC_PLUGINS 92 select HAVE_GENERIC_VDSO if MMU && 64BIT 93 select HAVE_IRQ_TIME_ACCOUNTING 94 select HAVE_KPROBES if !XIP_KERNEL 95 select HAVE_KPROBES_ON_FTRACE if !XIP_KERNEL 96 select HAVE_KRETPROBES if !XIP_KERNEL 97 select HAVE_MOVE_PMD 98 select HAVE_MOVE_PUD 99 select HAVE_PCI 100 select HAVE_PERF_EVENTS 101 select HAVE_PERF_REGS 102 select HAVE_PERF_USER_STACK_DUMP 103 select HAVE_REGS_AND_STACK_ACCESS_API 104 select HAVE_FUNCTION_ARG_ACCESS_API 105 select HAVE_STACKPROTECTOR 106 select HAVE_SYSCALL_TRACEPOINTS 107 select HAVE_RSEQ 108 select IRQ_DOMAIN 109 select IRQ_FORCED_THREADING 110 select MODULES_USE_ELF_RELA if MODULES 111 select MODULE_SECTIONS if MODULES 112 select OF 113 select OF_EARLY_FLATTREE 114 select OF_IRQ 115 select PCI_DOMAINS_GENERIC if PCI 116 select PCI_MSI if PCI 117 select RISCV_INTC 118 select RISCV_TIMER if RISCV_SBI 119 select SPARSE_IRQ 120 select SYSCTL_EXCEPTION_TRACE 121 select THREAD_INFO_IN_TASK 122 select TRACE_IRQFLAGS_SUPPORT 123 select UACCESS_MEMCPY if !MMU 124 select ZONE_DMA32 if 64BIT 125 126config ARCH_MMAP_RND_BITS_MIN 127 default 18 if 64BIT 128 default 8 129 130# max bits determined by the following formula: 131# VA_BITS - PAGE_SHIFT - 3 132config ARCH_MMAP_RND_BITS_MAX 133 default 24 if 64BIT # SV39 based 134 default 17 135 136# set if we run in machine mode, cleared if we run in supervisor mode 137config RISCV_M_MODE 138 bool 139 default !MMU 140 141# set if we are running in S-mode and can use SBI calls 142config RISCV_SBI 143 bool 144 depends on !RISCV_M_MODE 145 default y 146 147config MMU 148 bool "MMU-based Paged Memory Management Support" 149 default y 150 help 151 Select if you want MMU-based virtualised addressing space 152 support by paged memory management. If unsure, say 'Y'. 153 154config PAGE_OFFSET 155 hex 156 default 0xC0000000 if 32BIT 157 default 0x80000000 if 64BIT && !MMU 158 default 0xff60000000000000 if 64BIT 159 160config KASAN_SHADOW_OFFSET 161 hex 162 depends on KASAN_GENERIC 163 default 0xdfffffff00000000 if 64BIT 164 default 0xffffffff if 32BIT 165 166config ARCH_FLATMEM_ENABLE 167 def_bool !NUMA 168 169config ARCH_SPARSEMEM_ENABLE 170 def_bool y 171 depends on MMU 172 select SPARSEMEM_STATIC if 32BIT && SPARSEMEM 173 select SPARSEMEM_VMEMMAP_ENABLE if 64BIT 174 175config ARCH_SELECT_MEMORY_MODEL 176 def_bool ARCH_SPARSEMEM_ENABLE 177 178config ARCH_SUPPORTS_UPROBES 179 def_bool y 180 181config STACKTRACE_SUPPORT 182 def_bool y 183 184config GENERIC_BUG 185 def_bool y 186 depends on BUG 187 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT 188 189config GENERIC_BUG_RELATIVE_POINTERS 190 bool 191 192config GENERIC_CALIBRATE_DELAY 193 def_bool y 194 195config GENERIC_CSUM 196 def_bool y 197 198config GENERIC_HWEIGHT 199 def_bool y 200 201config FIX_EARLYCON_MEM 202 def_bool MMU 203 204config PGTABLE_LEVELS 205 int 206 default 5 if 64BIT 207 default 2 208 209config LOCKDEP_SUPPORT 210 def_bool y 211 212source "arch/riscv/Kconfig.socs" 213source "arch/riscv/Kconfig.erratas" 214 215menu "Platform type" 216 217choice 218 prompt "Base ISA" 219 default ARCH_RV64I 220 help 221 This selects the base ISA that this kernel will target and must match 222 the target platform. 223 224config ARCH_RV32I 225 bool "RV32I" 226 select 32BIT 227 select GENERIC_LIB_ASHLDI3 228 select GENERIC_LIB_ASHRDI3 229 select GENERIC_LIB_LSHRDI3 230 select GENERIC_LIB_UCMPDI2 231 select MMU 232 233config ARCH_RV64I 234 bool "RV64I" 235 select 64BIT 236 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 237 select HAVE_DYNAMIC_FTRACE if !XIP_KERNEL && MMU && $(cc-option,-fpatchable-function-entry=8) 238 select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE 239 select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL 240 select HAVE_FUNCTION_GRAPH_TRACER 241 select HAVE_FUNCTION_TRACER if !XIP_KERNEL 242 select SWIOTLB if MMU 243 244endchoice 245 246# We must be able to map all physical memory into the kernel, but the compiler 247# is still a bit more efficient when generating code if it's setup in a manner 248# such that it can only map 2GiB of memory. 249choice 250 prompt "Kernel Code Model" 251 default CMODEL_MEDLOW if 32BIT 252 default CMODEL_MEDANY if 64BIT 253 254 config CMODEL_MEDLOW 255 bool "medium low code model" 256 config CMODEL_MEDANY 257 bool "medium any code model" 258endchoice 259 260config MODULE_SECTIONS 261 bool 262 select HAVE_MOD_ARCH_SPECIFIC 263 264config SMP 265 bool "Symmetric Multi-Processing" 266 help 267 This enables support for systems with more than one CPU. If 268 you say N here, the kernel will run on single and 269 multiprocessor machines, but will use only one CPU of a 270 multiprocessor machine. If you say Y here, the kernel will run 271 on many, but not all, single processor machines. On a single 272 processor machine, the kernel will run faster if you say N 273 here. 274 275 If you don't know what to do here, say N. 276 277config NR_CPUS 278 int "Maximum number of CPUs (2-32)" 279 range 2 32 280 depends on SMP 281 default "8" 282 283config HOTPLUG_CPU 284 bool "Support for hot-pluggable CPUs" 285 depends on SMP 286 select GENERIC_IRQ_MIGRATION 287 help 288 289 Say Y here to experiment with turning CPUs off and on. CPUs 290 can be controlled through /sys/devices/system/cpu. 291 292 Say N if you want to disable CPU hotplug. 293 294choice 295 prompt "CPU Tuning" 296 default TUNE_GENERIC 297 298config TUNE_GENERIC 299 bool "generic" 300 301endchoice 302 303# Common NUMA Features 304config NUMA 305 bool "NUMA Memory Allocation and Scheduler Support" 306 depends on SMP && MMU 307 select GENERIC_ARCH_NUMA 308 select OF_NUMA 309 select ARCH_SUPPORTS_NUMA_BALANCING 310 select USE_PERCPU_NUMA_NODE_ID 311 select NEED_PER_CPU_EMBED_FIRST_CHUNK 312 help 313 Enable NUMA (Non-Uniform Memory Access) support. 314 315 The kernel will try to allocate memory used by a CPU on the 316 local memory of the CPU and add some more NUMA awareness to the kernel. 317 318config NODES_SHIFT 319 int "Maximum NUMA Nodes (as a power of 2)" 320 range 1 10 321 default "2" 322 depends on NUMA 323 help 324 Specify the maximum number of NUMA Nodes available on the target 325 system. Increases memory reserved to accommodate various tables. 326 327config RISCV_ISA_C 328 bool "Emit compressed instructions when building Linux" 329 default y 330 help 331 Adds "C" to the ISA subsets that the toolchain is allowed to emit 332 when building Linux, which results in compressed instructions in the 333 Linux binary. 334 335 If you don't know what to do here, say Y. 336 337config FPU 338 bool "FPU support" 339 default y 340 help 341 Say N here if you want to disable all floating-point related procedure 342 in the kernel. 343 344 If you don't know what to do here, say Y. 345 346endmenu 347 348menu "Kernel features" 349 350source "kernel/Kconfig.hz" 351 352config RISCV_SBI_V01 353 bool "SBI v0.1 support" 354 depends on RISCV_SBI 355 help 356 This config allows kernel to use SBI v0.1 APIs. This will be 357 deprecated in future once legacy M-mode software are no longer in use. 358 359config RISCV_BOOT_SPINWAIT 360 bool "Spinwait booting method" 361 depends on SMP 362 default y 363 help 364 This enables support for booting Linux via spinwait method. In the 365 spinwait method, all cores randomly jump to Linux. One of the cores 366 gets chosen via lottery and all other keep spinning on a percpu 367 variable. This method cannot support CPU hotplug and sparse hartid 368 scheme. It should be only enabled for M-mode Linux or platforms relying 369 on older firmware without SBI HSM extension. All other platforms should 370 rely on ordered booting via SBI HSM extension which gets chosen 371 dynamically at runtime if the firmware supports it. 372 373config KEXEC 374 bool "Kexec system call" 375 select KEXEC_CORE 376 select HOTPLUG_CPU if SMP 377 depends on MMU 378 help 379 kexec is a system call that implements the ability to shutdown your 380 current kernel, and to start another kernel. It is like a reboot 381 but it is independent of the system firmware. And like a reboot 382 you can start any kernel with it, not just Linux. 383 384 The name comes from the similarity to the exec system call. 385 386config CRASH_DUMP 387 bool "Build kdump crash kernel" 388 help 389 Generate crash dump after being started by kexec. This should 390 be normally only set in special crash dump kernels which are 391 loaded in the main kernel with kexec-tools into a specially 392 reserved region and then later executed after a crash by 393 kdump/kexec. 394 395 For more details see Documentation/admin-guide/kdump/kdump.rst 396 397endmenu 398 399menu "Boot options" 400 401config CMDLINE 402 string "Built-in kernel command line" 403 help 404 For most platforms, the arguments for the kernel's command line 405 are provided at run-time, during boot. However, there are cases 406 where either no arguments are being provided or the provided 407 arguments are insufficient or even invalid. 408 409 When that occurs, it is possible to define a built-in command 410 line here and choose how the kernel should use it later on. 411 412choice 413 prompt "Built-in command line usage" if CMDLINE != "" 414 default CMDLINE_FALLBACK 415 help 416 Choose how the kernel will handle the provided built-in command 417 line. 418 419config CMDLINE_FALLBACK 420 bool "Use bootloader kernel arguments if available" 421 help 422 Use the built-in command line as fallback in case we get nothing 423 during boot. This is the default behaviour. 424 425config CMDLINE_EXTEND 426 bool "Extend bootloader kernel arguments" 427 help 428 The command-line arguments provided during boot will be 429 appended to the built-in command line. This is useful in 430 cases where the provided arguments are insufficient and 431 you don't want to or cannot modify them. 432 433 434config CMDLINE_FORCE 435 bool "Always use the default kernel command string" 436 help 437 Always use the built-in command line, even if we get one during 438 boot. This is useful in case you need to override the provided 439 command line on systems where you don't have or want control 440 over it. 441 442endchoice 443 444config EFI_STUB 445 bool 446 447config EFI 448 bool "UEFI runtime support" 449 depends on OF && !XIP_KERNEL 450 select LIBFDT 451 select UCS2_STRING 452 select EFI_PARAMS_FROM_FDT 453 select EFI_STUB 454 select EFI_GENERIC_STUB 455 select EFI_RUNTIME_WRAPPERS 456 select RISCV_ISA_C 457 depends on MMU 458 default y 459 help 460 This option provides support for runtime services provided 461 by UEFI firmware (such as non-volatile variables, realtime 462 clock, and platform reset). A UEFI stub is also provided to 463 allow the kernel to be booted as an EFI application. This 464 is only useful on systems that have UEFI firmware. 465 466config CC_HAVE_STACKPROTECTOR_TLS 467 def_bool $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=tp -mstack-protector-guard-offset=0) 468 469config STACKPROTECTOR_PER_TASK 470 def_bool y 471 depends on !GCC_PLUGIN_RANDSTRUCT 472 depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS 473 474config PHYS_RAM_BASE_FIXED 475 bool "Explicitly specified physical RAM address" 476 default n 477 478config PHYS_RAM_BASE 479 hex "Platform Physical RAM address" 480 depends on PHYS_RAM_BASE_FIXED 481 default "0x80000000" 482 help 483 This is the physical address of RAM in the system. It has to be 484 explicitly specified to run early relocations of read-write data 485 from flash to RAM. 486 487config XIP_KERNEL 488 bool "Kernel Execute-In-Place from ROM" 489 depends on MMU && SPARSEMEM 490 # This prevents XIP from being enabled by all{yes,mod}config, which 491 # fail to build since XIP doesn't support large kernels. 492 depends on !COMPILE_TEST 493 select PHYS_RAM_BASE_FIXED 494 help 495 Execute-In-Place allows the kernel to run from non-volatile storage 496 directly addressable by the CPU, such as NOR flash. This saves RAM 497 space since the text section of the kernel is not loaded from flash 498 to RAM. Read-write sections, such as the data section and stack, 499 are still copied to RAM. The XIP kernel is not compressed since 500 it has to run directly from flash, so it will take more space to 501 store it. The flash address used to link the kernel object files, 502 and for storing it, is configuration dependent. Therefore, if you 503 say Y here, you must know the proper physical address where to 504 store the kernel image depending on your own flash memory usage. 505 506 Also note that the make target becomes "make xipImage" rather than 507 "make zImage" or "make Image". The final kernel binary to put in 508 ROM memory will be arch/riscv/boot/xipImage. 509 510 SPARSEMEM is required because the kernel text and rodata that are 511 flash resident are not backed by memmap, then any attempt to get 512 a struct page on those regions will trigger a fault. 513 514 If unsure, say N. 515 516config XIP_PHYS_ADDR 517 hex "XIP Kernel Physical Location" 518 depends on XIP_KERNEL 519 default "0x21000000" 520 help 521 This is the physical address in your flash memory the kernel will 522 be linked for and stored to. This address is dependent on your 523 own flash usage. 524 525endmenu 526 527config BUILTIN_DTB 528 bool 529 depends on OF 530 default y if XIP_KERNEL 531 532menu "Power management options" 533 534source "kernel/power/Kconfig" 535 536endmenu 537 538menu "CPU Power Management" 539 540source "drivers/cpuidle/Kconfig" 541 542endmenu 543 544source "arch/riscv/kvm/Kconfig" 545