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_SUPPORTS_ATOMIC_RMW 17 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if MMU 18 select ARCH_STACKWALK 19 select ARCH_HAS_BINFMT_FLAT 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 30 select ARCH_HAS_SET_MEMORY 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_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX 35 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT 36 select ARCH_SUPPORTS_HUGETLBFS if MMU 37 select ARCH_USE_MEMTEST 38 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU 39 select ARCH_WANT_FRAME_POINTERS 40 select ARCH_WANT_HUGE_PMD_SHARE if 64BIT 41 select BINFMT_FLAT_NO_DATA_START_OFFSET if !MMU 42 select CLONE_BACKWARDS 43 select CLINT_TIMER if !MMU 44 select COMMON_CLK 45 select EDAC_SUPPORT 46 select GENERIC_ARCH_TOPOLOGY if SMP 47 select GENERIC_ATOMIC64 if !64BIT 48 select GENERIC_CLOCKEVENTS_BROADCAST if SMP 49 select GENERIC_EARLY_IOREMAP 50 select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO 51 select GENERIC_IOREMAP 52 select GENERIC_IRQ_MULTI_HANDLER 53 select GENERIC_IRQ_SHOW 54 select GENERIC_LIB_DEVMEM_IS_ALLOWED 55 select GENERIC_PCI_IOMAP 56 select GENERIC_PTDUMP if MMU 57 select GENERIC_SCHED_CLOCK 58 select GENERIC_SMP_IDLE_THREAD 59 select GENERIC_STRNCPY_FROM_USER if MMU 60 select GENERIC_STRNLEN_USER if MMU 61 select GENERIC_TIME_VSYSCALL if MMU && 64BIT 62 select HANDLE_DOMAIN_IRQ 63 select HAVE_ARCH_AUDITSYSCALL 64 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL 65 select HAVE_ARCH_JUMP_LABEL_RELATIVE if !XIP_KERNEL 66 select HAVE_ARCH_KASAN if MMU && 64BIT 67 select HAVE_ARCH_KASAN_VMALLOC if MMU && 64BIT 68 select HAVE_ARCH_KGDB if !XIP_KERNEL 69 select HAVE_ARCH_KGDB_QXFER_PKT 70 select HAVE_ARCH_MMAP_RND_BITS if MMU 71 select HAVE_ARCH_SECCOMP_FILTER 72 select HAVE_ARCH_TRACEHOOK 73 select HAVE_ASM_MODVERSIONS 74 select HAVE_CONTEXT_TRACKING 75 select HAVE_DEBUG_KMEMLEAK 76 select HAVE_DMA_CONTIGUOUS if MMU 77 select HAVE_EBPF_JIT if MMU 78 select HAVE_FUNCTION_ERROR_INJECTION 79 select HAVE_FUTEX_CMPXCHG if FUTEX 80 select HAVE_GCC_PLUGINS 81 select HAVE_GENERIC_VDSO if MMU && 64BIT 82 select HAVE_IRQ_TIME_ACCOUNTING 83 select HAVE_KPROBES if !XIP_KERNEL 84 select HAVE_KPROBES_ON_FTRACE if !XIP_KERNEL 85 select HAVE_KRETPROBES if !XIP_KERNEL 86 select HAVE_PCI 87 select HAVE_PERF_EVENTS 88 select HAVE_PERF_REGS 89 select HAVE_PERF_USER_STACK_DUMP 90 select HAVE_REGS_AND_STACK_ACCESS_API 91 select HAVE_STACKPROTECTOR 92 select HAVE_SYSCALL_TRACEPOINTS 93 select IRQ_DOMAIN 94 select MODULES_USE_ELF_RELA if MODULES 95 select MODULE_SECTIONS if MODULES 96 select OF 97 select OF_EARLY_FLATTREE 98 select OF_IRQ 99 select PCI_DOMAINS_GENERIC if PCI 100 select PCI_MSI if PCI 101 select RISCV_INTC 102 select RISCV_TIMER if RISCV_SBI 103 select SPARSE_IRQ 104 select SYSCTL_EXCEPTION_TRACE 105 select THREAD_INFO_IN_TASK 106 select UACCESS_MEMCPY if !MMU 107 select ZONE_DMA32 if 64BIT 108 109config ARCH_MMAP_RND_BITS_MIN 110 default 18 if 64BIT 111 default 8 112 113# max bits determined by the following formula: 114# VA_BITS - PAGE_SHIFT - 3 115config ARCH_MMAP_RND_BITS_MAX 116 default 24 if 64BIT # SV39 based 117 default 17 118 119# set if we run in machine mode, cleared if we run in supervisor mode 120config RISCV_M_MODE 121 bool 122 default !MMU 123 124# set if we are running in S-mode and can use SBI calls 125config RISCV_SBI 126 bool 127 depends on !RISCV_M_MODE 128 default y 129 130config MMU 131 bool "MMU-based Paged Memory Management Support" 132 default y 133 help 134 Select if you want MMU-based virtualised addressing space 135 support by paged memory management. If unsure, say 'Y'. 136 137config VA_BITS 138 int 139 default 32 if 32BIT 140 default 39 if 64BIT 141 142config PA_BITS 143 int 144 default 34 if 32BIT 145 default 56 if 64BIT 146 147config PAGE_OFFSET 148 hex 149 default 0xC0000000 if 32BIT && MAXPHYSMEM_1GB 150 default 0x80000000 if 64BIT && !MMU 151 default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB 152 default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB 153 154config ARCH_FLATMEM_ENABLE 155 def_bool !NUMA 156 157config ARCH_SPARSEMEM_ENABLE 158 def_bool y 159 depends on MMU 160 select SPARSEMEM_STATIC if 32BIT && SPARSEMEM 161 select SPARSEMEM_VMEMMAP_ENABLE if 64BIT 162 163config ARCH_SELECT_MEMORY_MODEL 164 def_bool ARCH_SPARSEMEM_ENABLE 165 166config ARCH_WANT_GENERAL_HUGETLB 167 def_bool y 168 169config ARCH_SUPPORTS_UPROBES 170 def_bool y 171 172config STACKTRACE_SUPPORT 173 def_bool y 174 175config TRACE_IRQFLAGS_SUPPORT 176 def_bool y 177 178config GENERIC_BUG 179 def_bool y 180 depends on BUG 181 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT 182 183config GENERIC_BUG_RELATIVE_POINTERS 184 bool 185 186config GENERIC_CALIBRATE_DELAY 187 def_bool y 188 189config GENERIC_CSUM 190 def_bool y 191 192config GENERIC_HWEIGHT 193 def_bool y 194 195config FIX_EARLYCON_MEM 196 def_bool MMU 197 198config PGTABLE_LEVELS 199 int 200 default 3 if 64BIT 201 default 2 202 203config LOCKDEP_SUPPORT 204 def_bool y 205 206source "arch/riscv/Kconfig.socs" 207source "arch/riscv/Kconfig.erratas" 208 209menu "Platform type" 210 211choice 212 prompt "Base ISA" 213 default ARCH_RV64I 214 help 215 This selects the base ISA that this kernel will target and must match 216 the target platform. 217 218config ARCH_RV32I 219 bool "RV32I" 220 select 32BIT 221 select GENERIC_LIB_ASHLDI3 222 select GENERIC_LIB_ASHRDI3 223 select GENERIC_LIB_LSHRDI3 224 select GENERIC_LIB_UCMPDI2 225 select MMU 226 227config ARCH_RV64I 228 bool "RV64I" 229 select 64BIT 230 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && GCC_VERSION >= 50000 231 select HAVE_DYNAMIC_FTRACE if !XIP_KERNEL && MMU && $(cc-option,-fpatchable-function-entry=8) 232 select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE 233 select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL 234 select HAVE_FUNCTION_GRAPH_TRACER 235 select HAVE_FUNCTION_TRACER if !XIP_KERNEL 236 select SWIOTLB if MMU 237 238endchoice 239 240# We must be able to map all physical memory into the kernel, but the compiler 241# is still a bit more efficient when generating code if it's setup in a manner 242# such that it can only map 2GiB of memory. 243choice 244 prompt "Kernel Code Model" 245 default CMODEL_MEDLOW if 32BIT 246 default CMODEL_MEDANY if 64BIT 247 248 config CMODEL_MEDLOW 249 bool "medium low code model" 250 config CMODEL_MEDANY 251 bool "medium any code model" 252endchoice 253 254config MODULE_SECTIONS 255 bool 256 select HAVE_MOD_ARCH_SPECIFIC 257 258choice 259 prompt "Maximum Physical Memory" 260 default MAXPHYSMEM_1GB if 32BIT 261 default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW 262 default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY 263 264 config MAXPHYSMEM_1GB 265 depends on 32BIT 266 bool "1GiB" 267 config MAXPHYSMEM_2GB 268 depends on 64BIT && CMODEL_MEDLOW 269 bool "2GiB" 270 config MAXPHYSMEM_128GB 271 depends on 64BIT && CMODEL_MEDANY 272 bool "128GiB" 273endchoice 274 275 276config SMP 277 bool "Symmetric Multi-Processing" 278 help 279 This enables support for systems with more than one CPU. If 280 you say N here, the kernel will run on single and 281 multiprocessor machines, but will use only one CPU of a 282 multiprocessor machine. If you say Y here, the kernel will run 283 on many, but not all, single processor machines. On a single 284 processor machine, the kernel will run faster if you say N 285 here. 286 287 If you don't know what to do here, say N. 288 289config NR_CPUS 290 int "Maximum number of CPUs (2-32)" 291 range 2 32 292 depends on SMP 293 default "8" 294 295config HOTPLUG_CPU 296 bool "Support for hot-pluggable CPUs" 297 depends on SMP 298 select GENERIC_IRQ_MIGRATION 299 help 300 301 Say Y here to experiment with turning CPUs off and on. CPUs 302 can be controlled through /sys/devices/system/cpu. 303 304 Say N if you want to disable CPU hotplug. 305 306choice 307 prompt "CPU Tuning" 308 default TUNE_GENERIC 309 310config TUNE_GENERIC 311 bool "generic" 312 313endchoice 314 315# Common NUMA Features 316config NUMA 317 bool "NUMA Memory Allocation and Scheduler Support" 318 depends on SMP && MMU 319 select GENERIC_ARCH_NUMA 320 select OF_NUMA 321 select ARCH_SUPPORTS_NUMA_BALANCING 322 help 323 Enable NUMA (Non-Uniform Memory Access) support. 324 325 The kernel will try to allocate memory used by a CPU on the 326 local memory of the CPU and add some more NUMA awareness to the kernel. 327 328config NODES_SHIFT 329 int "Maximum NUMA Nodes (as a power of 2)" 330 range 1 10 331 default "2" 332 depends on NUMA 333 help 334 Specify the maximum number of NUMA Nodes available on the target 335 system. Increases memory reserved to accommodate various tables. 336 337config USE_PERCPU_NUMA_NODE_ID 338 def_bool y 339 depends on NUMA 340 341config NEED_PER_CPU_EMBED_FIRST_CHUNK 342 def_bool y 343 depends on NUMA 344 345config RISCV_ISA_C 346 bool "Emit compressed instructions when building Linux" 347 default y 348 help 349 Adds "C" to the ISA subsets that the toolchain is allowed to emit 350 when building Linux, which results in compressed instructions in the 351 Linux binary. 352 353 If you don't know what to do here, say Y. 354 355menu "supported PMU type" 356 depends on PERF_EVENTS 357 358config RISCV_BASE_PMU 359 bool "Base Performance Monitoring Unit" 360 def_bool y 361 help 362 A base PMU that serves as a reference implementation and has limited 363 feature of perf. It can run on any RISC-V machines so serves as the 364 fallback, but this option can also be disable to reduce kernel size. 365 366endmenu 367 368config FPU 369 bool "FPU support" 370 default y 371 help 372 Say N here if you want to disable all floating-point related procedure 373 in the kernel. 374 375 If you don't know what to do here, say Y. 376 377endmenu 378 379menu "Kernel features" 380 381source "kernel/Kconfig.hz" 382 383config RISCV_SBI_V01 384 bool "SBI v0.1 support" 385 default y 386 depends on RISCV_SBI 387 help 388 This config allows kernel to use SBI v0.1 APIs. This will be 389 deprecated in future once legacy M-mode software are no longer in use. 390 391config KEXEC 392 bool "Kexec system call" 393 select KEXEC_CORE 394 select HOTPLUG_CPU if SMP 395 depends on MMU 396 help 397 kexec is a system call that implements the ability to shutdown your 398 current kernel, and to start another kernel. It is like a reboot 399 but it is independent of the system firmware. And like a reboot 400 you can start any kernel with it, not just Linux. 401 402 The name comes from the similarity to the exec system call. 403 404config CRASH_DUMP 405 bool "Build kdump crash kernel" 406 help 407 Generate crash dump after being started by kexec. This should 408 be normally only set in special crash dump kernels which are 409 loaded in the main kernel with kexec-tools into a specially 410 reserved region and then later executed after a crash by 411 kdump/kexec. 412 413 For more details see Documentation/admin-guide/kdump/kdump.rst 414 415endmenu 416 417menu "Boot options" 418 419config CMDLINE 420 string "Built-in kernel command line" 421 help 422 For most platforms, the arguments for the kernel's command line 423 are provided at run-time, during boot. However, there are cases 424 where either no arguments are being provided or the provided 425 arguments are insufficient or even invalid. 426 427 When that occurs, it is possible to define a built-in command 428 line here and choose how the kernel should use it later on. 429 430choice 431 prompt "Built-in command line usage" if CMDLINE != "" 432 default CMDLINE_FALLBACK 433 help 434 Choose how the kernel will handle the provided built-in command 435 line. 436 437config CMDLINE_FALLBACK 438 bool "Use bootloader kernel arguments if available" 439 help 440 Use the built-in command line as fallback in case we get nothing 441 during boot. This is the default behaviour. 442 443config CMDLINE_EXTEND 444 bool "Extend bootloader kernel arguments" 445 help 446 The command-line arguments provided during boot will be 447 appended to the built-in command line. This is useful in 448 cases where the provided arguments are insufficient and 449 you don't want to or cannot modify them. 450 451 452config CMDLINE_FORCE 453 bool "Always use the default kernel command string" 454 help 455 Always use the built-in command line, even if we get one during 456 boot. This is useful in case you need to override the provided 457 command line on systems where you don't have or want control 458 over it. 459 460endchoice 461 462config EFI_STUB 463 bool 464 465config EFI 466 bool "UEFI runtime support" 467 depends on OF && !XIP_KERNEL 468 select LIBFDT 469 select UCS2_STRING 470 select EFI_PARAMS_FROM_FDT 471 select EFI_STUB 472 select EFI_GENERIC_STUB 473 select EFI_RUNTIME_WRAPPERS 474 select RISCV_ISA_C 475 depends on MMU 476 default y 477 help 478 This option provides support for runtime services provided 479 by UEFI firmware (such as non-volatile variables, realtime 480 clock, and platform reset). A UEFI stub is also provided to 481 allow the kernel to be booted as an EFI application. This 482 is only useful on systems that have UEFI firmware. 483 484config CC_HAVE_STACKPROTECTOR_TLS 485 def_bool $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=tp -mstack-protector-guard-offset=0) 486 487config STACKPROTECTOR_PER_TASK 488 def_bool y 489 depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS 490 491config PHYS_RAM_BASE_FIXED 492 bool "Explicitly specified physical RAM address" 493 default n 494 495config PHYS_RAM_BASE 496 hex "Platform Physical RAM address" 497 depends on PHYS_RAM_BASE_FIXED 498 default "0x80000000" 499 help 500 This is the physical address of RAM in the system. It has to be 501 explicitly specified to run early relocations of read-write data 502 from flash to RAM. 503 504config XIP_KERNEL 505 bool "Kernel Execute-In-Place from ROM" 506 depends on MMU && SPARSEMEM 507 # This prevents XIP from being enabled by all{yes,mod}config, which 508 # fail to build since XIP doesn't support large kernels. 509 depends on !COMPILE_TEST 510 select PHYS_RAM_BASE_FIXED 511 help 512 Execute-In-Place allows the kernel to run from non-volatile storage 513 directly addressable by the CPU, such as NOR flash. This saves RAM 514 space since the text section of the kernel is not loaded from flash 515 to RAM. Read-write sections, such as the data section and stack, 516 are still copied to RAM. The XIP kernel is not compressed since 517 it has to run directly from flash, so it will take more space to 518 store it. The flash address used to link the kernel object files, 519 and for storing it, is configuration dependent. Therefore, if you 520 say Y here, you must know the proper physical address where to 521 store the kernel image depending on your own flash memory usage. 522 523 Also note that the make target becomes "make xipImage" rather than 524 "make zImage" or "make Image". The final kernel binary to put in 525 ROM memory will be arch/riscv/boot/xipImage. 526 527 SPARSEMEM is required because the kernel text and rodata that are 528 flash resident are not backed by memmap, then any attempt to get 529 a struct page on those regions will trigger a fault. 530 531 If unsure, say N. 532 533config XIP_PHYS_ADDR 534 hex "XIP Kernel Physical Location" 535 depends on XIP_KERNEL 536 default "0x21000000" 537 help 538 This is the physical address in your flash memory the kernel will 539 be linked for and stored to. This address is dependent on your 540 own flash usage. 541 542endmenu 543 544config BUILTIN_DTB 545 bool 546 depends on OF 547 default y if XIP_KERNEL 548 549menu "Power management options" 550 551source "kernel/power/Kconfig" 552 553endmenu 554 555source "drivers/firmware/Kconfig" 556