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 65 select HAVE_ARCH_JUMP_LABEL_RELATIVE 66 select HAVE_ARCH_KASAN if MMU && 64BIT 67 select HAVE_ARCH_KASAN_VMALLOC if MMU && 64BIT 68 select HAVE_ARCH_KGDB 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 84 select HAVE_KPROBES_ON_FTRACE 85 select HAVE_KRETPROBES 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 108config ARCH_MMAP_RND_BITS_MIN 109 default 18 if 64BIT 110 default 8 111 112# max bits determined by the following formula: 113# VA_BITS - PAGE_SHIFT - 3 114config ARCH_MMAP_RND_BITS_MAX 115 default 24 if 64BIT # SV39 based 116 default 17 117 118# set if we run in machine mode, cleared if we run in supervisor mode 119config RISCV_M_MODE 120 bool 121 default !MMU 122 123# set if we are running in S-mode and can use SBI calls 124config RISCV_SBI 125 bool 126 depends on !RISCV_M_MODE 127 default y 128 129config MMU 130 bool "MMU-based Paged Memory Management Support" 131 default y 132 help 133 Select if you want MMU-based virtualised addressing space 134 support by paged memory management. If unsure, say 'Y'. 135 136config ZONE_DMA32 137 bool 138 default y if 64BIT 139 140config VA_BITS 141 int 142 default 32 if 32BIT 143 default 39 if 64BIT 144 145config PA_BITS 146 int 147 default 34 if 32BIT 148 default 56 if 64BIT 149 150config PAGE_OFFSET 151 hex 152 default 0xC0000000 if 32BIT && MAXPHYSMEM_1GB 153 default 0x80000000 if 64BIT && !MMU 154 default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB 155 default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB 156 157config ARCH_FLATMEM_ENABLE 158 def_bool !NUMA 159 160config ARCH_SPARSEMEM_ENABLE 161 def_bool y 162 depends on MMU 163 select SPARSEMEM_STATIC if 32BIT && SPARSEMEM 164 select SPARSEMEM_VMEMMAP_ENABLE if 64BIT 165 166config ARCH_SELECT_MEMORY_MODEL 167 def_bool ARCH_SPARSEMEM_ENABLE 168 169config ARCH_WANT_GENERAL_HUGETLB 170 def_bool y 171 172config ARCH_SUPPORTS_UPROBES 173 def_bool y 174 175config STACKTRACE_SUPPORT 176 def_bool y 177 178config TRACE_IRQFLAGS_SUPPORT 179 def_bool y 180 181config GENERIC_BUG 182 def_bool y 183 depends on BUG 184 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT 185 186config GENERIC_BUG_RELATIVE_POINTERS 187 bool 188 189config GENERIC_CALIBRATE_DELAY 190 def_bool y 191 192config GENERIC_CSUM 193 def_bool y 194 195config GENERIC_HWEIGHT 196 def_bool y 197 198config FIX_EARLYCON_MEM 199 def_bool MMU 200 201config PGTABLE_LEVELS 202 int 203 default 3 if 64BIT 204 default 2 205 206config LOCKDEP_SUPPORT 207 def_bool y 208 209source "arch/riscv/Kconfig.socs" 210source "arch/riscv/Kconfig.erratas" 211 212menu "Platform type" 213 214choice 215 prompt "Base ISA" 216 default ARCH_RV64I 217 help 218 This selects the base ISA that this kernel will target and must match 219 the target platform. 220 221config ARCH_RV32I 222 bool "RV32I" 223 select 32BIT 224 select GENERIC_LIB_ASHLDI3 225 select GENERIC_LIB_ASHRDI3 226 select GENERIC_LIB_LSHRDI3 227 select GENERIC_LIB_UCMPDI2 228 select MMU 229 230config ARCH_RV64I 231 bool "RV64I" 232 select 64BIT 233 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && GCC_VERSION >= 50000 234 select HAVE_DYNAMIC_FTRACE if MMU && $(cc-option,-fpatchable-function-entry=8) 235 select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE 236 select HAVE_FTRACE_MCOUNT_RECORD 237 select HAVE_FUNCTION_GRAPH_TRACER 238 select HAVE_FUNCTION_TRACER 239 select SWIOTLB if MMU 240 241endchoice 242 243# We must be able to map all physical memory into the kernel, but the compiler 244# is still a bit more efficient when generating code if it's setup in a manner 245# such that it can only map 2GiB of memory. 246choice 247 prompt "Kernel Code Model" 248 default CMODEL_MEDLOW if 32BIT 249 default CMODEL_MEDANY if 64BIT 250 251 config CMODEL_MEDLOW 252 bool "medium low code model" 253 config CMODEL_MEDANY 254 bool "medium any code model" 255endchoice 256 257config MODULE_SECTIONS 258 bool 259 select HAVE_MOD_ARCH_SPECIFIC 260 261choice 262 prompt "Maximum Physical Memory" 263 default MAXPHYSMEM_1GB if 32BIT 264 default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW 265 default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY 266 267 config MAXPHYSMEM_1GB 268 depends on 32BIT 269 bool "1GiB" 270 config MAXPHYSMEM_2GB 271 depends on 64BIT && CMODEL_MEDLOW 272 bool "2GiB" 273 config MAXPHYSMEM_128GB 274 depends on 64BIT && CMODEL_MEDANY 275 bool "128GiB" 276endchoice 277 278 279config SMP 280 bool "Symmetric Multi-Processing" 281 help 282 This enables support for systems with more than one CPU. If 283 you say N here, the kernel will run on single and 284 multiprocessor machines, but will use only one CPU of a 285 multiprocessor machine. If you say Y here, the kernel will run 286 on many, but not all, single processor machines. On a single 287 processor machine, the kernel will run faster if you say N 288 here. 289 290 If you don't know what to do here, say N. 291 292config NR_CPUS 293 int "Maximum number of CPUs (2-32)" 294 range 2 32 295 depends on SMP 296 default "8" 297 298config HOTPLUG_CPU 299 bool "Support for hot-pluggable CPUs" 300 depends on SMP 301 select GENERIC_IRQ_MIGRATION 302 help 303 304 Say Y here to experiment with turning CPUs off and on. CPUs 305 can be controlled through /sys/devices/system/cpu. 306 307 Say N if you want to disable CPU hotplug. 308 309choice 310 prompt "CPU Tuning" 311 default TUNE_GENERIC 312 313config TUNE_GENERIC 314 bool "generic" 315 316endchoice 317 318# Common NUMA Features 319config NUMA 320 bool "NUMA Memory Allocation and Scheduler Support" 321 depends on SMP && MMU 322 select GENERIC_ARCH_NUMA 323 select OF_NUMA 324 select ARCH_SUPPORTS_NUMA_BALANCING 325 help 326 Enable NUMA (Non-Uniform Memory Access) support. 327 328 The kernel will try to allocate memory used by a CPU on the 329 local memory of the CPU and add some more NUMA awareness to the kernel. 330 331config NODES_SHIFT 332 int "Maximum NUMA Nodes (as a power of 2)" 333 range 1 10 334 default "2" 335 depends on NEED_MULTIPLE_NODES 336 help 337 Specify the maximum number of NUMA Nodes available on the target 338 system. Increases memory reserved to accommodate various tables. 339 340config USE_PERCPU_NUMA_NODE_ID 341 def_bool y 342 depends on NUMA 343 344config NEED_PER_CPU_EMBED_FIRST_CHUNK 345 def_bool y 346 depends on NUMA 347 348config RISCV_ISA_C 349 bool "Emit compressed instructions when building Linux" 350 default y 351 help 352 Adds "C" to the ISA subsets that the toolchain is allowed to emit 353 when building Linux, which results in compressed instructions in the 354 Linux binary. 355 356 If you don't know what to do here, say Y. 357 358menu "supported PMU type" 359 depends on PERF_EVENTS 360 361config RISCV_BASE_PMU 362 bool "Base Performance Monitoring Unit" 363 def_bool y 364 help 365 A base PMU that serves as a reference implementation and has limited 366 feature of perf. It can run on any RISC-V machines so serves as the 367 fallback, but this option can also be disable to reduce kernel size. 368 369endmenu 370 371config FPU 372 bool "FPU support" 373 default y 374 help 375 Say N here if you want to disable all floating-point related procedure 376 in the kernel. 377 378 If you don't know what to do here, say Y. 379 380endmenu 381 382menu "Kernel features" 383 384source "kernel/Kconfig.hz" 385 386config RISCV_SBI_V01 387 bool "SBI v0.1 support" 388 default y 389 depends on RISCV_SBI 390 help 391 This config allows kernel to use SBI v0.1 APIs. This will be 392 deprecated in future once legacy M-mode software are no longer in use. 393 394config KEXEC 395 bool "Kexec system call" 396 select KEXEC_CORE 397 select HOTPLUG_CPU if SMP 398 depends on MMU 399 help 400 kexec is a system call that implements the ability to shutdown your 401 current kernel, and to start another kernel. It is like a reboot 402 but it is independent of the system firmware. And like a reboot 403 you can start any kernel with it, not just Linux. 404 405 The name comes from the similarity to the exec system call. 406 407config CRASH_DUMP 408 bool "Build kdump crash kernel" 409 help 410 Generate crash dump after being started by kexec. This should 411 be normally only set in special crash dump kernels which are 412 loaded in the main kernel with kexec-tools into a specially 413 reserved region and then later executed after a crash by 414 kdump/kexec. 415 416 For more details see Documentation/admin-guide/kdump/kdump.rst 417 418endmenu 419 420menu "Boot options" 421 422config CMDLINE 423 string "Built-in kernel command line" 424 help 425 For most platforms, the arguments for the kernel's command line 426 are provided at run-time, during boot. However, there are cases 427 where either no arguments are being provided or the provided 428 arguments are insufficient or even invalid. 429 430 When that occurs, it is possible to define a built-in command 431 line here and choose how the kernel should use it later on. 432 433choice 434 prompt "Built-in command line usage" if CMDLINE != "" 435 default CMDLINE_FALLBACK 436 help 437 Choose how the kernel will handle the provided built-in command 438 line. 439 440config CMDLINE_FALLBACK 441 bool "Use bootloader kernel arguments if available" 442 help 443 Use the built-in command line as fallback in case we get nothing 444 during boot. This is the default behaviour. 445 446config CMDLINE_EXTEND 447 bool "Extend bootloader kernel arguments" 448 help 449 The command-line arguments provided during boot will be 450 appended to the built-in command line. This is useful in 451 cases where the provided arguments are insufficient and 452 you don't want to or cannot modify them. 453 454 455config CMDLINE_FORCE 456 bool "Always use the default kernel command string" 457 help 458 Always use the built-in command line, even if we get one during 459 boot. This is useful in case you need to override the provided 460 command line on systems where you don't have or want control 461 over it. 462 463endchoice 464 465config EFI_STUB 466 bool 467 468config EFI 469 bool "UEFI runtime support" 470 depends on OF && !XIP_KERNEL 471 select LIBFDT 472 select UCS2_STRING 473 select EFI_PARAMS_FROM_FDT 474 select EFI_STUB 475 select EFI_GENERIC_STUB 476 select EFI_RUNTIME_WRAPPERS 477 select RISCV_ISA_C 478 depends on MMU 479 default y 480 help 481 This option provides support for runtime services provided 482 by UEFI firmware (such as non-volatile variables, realtime 483 clock, and platform reset). A UEFI stub is also provided to 484 allow the kernel to be booted as an EFI application. This 485 is only useful on systems that have UEFI firmware. 486 487config CC_HAVE_STACKPROTECTOR_TLS 488 def_bool $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=tp -mstack-protector-guard-offset=0) 489 490config STACKPROTECTOR_PER_TASK 491 def_bool y 492 depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS 493 494config PHYS_RAM_BASE_FIXED 495 bool "Explicitly specified physical RAM address" 496 default n 497 498config PHYS_RAM_BASE 499 hex "Platform Physical RAM address" 500 depends on PHYS_RAM_BASE_FIXED 501 default "0x80000000" 502 help 503 This is the physical address of RAM in the system. It has to be 504 explicitly specified to run early relocations of read-write data 505 from flash to RAM. 506 507config XIP_KERNEL 508 bool "Kernel Execute-In-Place from ROM" 509 depends on MMU && SPARSEMEM 510 # This prevents XIP from being enabled by all{yes,mod}config, which 511 # fail to build since XIP doesn't support large kernels. 512 depends on !COMPILE_TEST 513 select PHYS_RAM_BASE_FIXED 514 help 515 Execute-In-Place allows the kernel to run from non-volatile storage 516 directly addressable by the CPU, such as NOR flash. This saves RAM 517 space since the text section of the kernel is not loaded from flash 518 to RAM. Read-write sections, such as the data section and stack, 519 are still copied to RAM. The XIP kernel is not compressed since 520 it has to run directly from flash, so it will take more space to 521 store it. The flash address used to link the kernel object files, 522 and for storing it, is configuration dependent. Therefore, if you 523 say Y here, you must know the proper physical address where to 524 store the kernel image depending on your own flash memory usage. 525 526 Also note that the make target becomes "make xipImage" rather than 527 "make zImage" or "make Image". The final kernel binary to put in 528 ROM memory will be arch/riscv/boot/xipImage. 529 530 SPARSEMEM is required because the kernel text and rodata that are 531 flash resident are not backed by memmap, then any attempt to get 532 a struct page on those regions will trigger a fault. 533 534 If unsure, say N. 535 536config XIP_PHYS_ADDR 537 hex "XIP Kernel Physical Location" 538 depends on XIP_KERNEL 539 default "0x21000000" 540 help 541 This is the physical address in your flash memory the kernel will 542 be linked for and stored to. This address is dependent on your 543 own flash usage. 544 545endmenu 546 547config BUILTIN_DTB 548 bool 549 depends on OF 550 default y if XIP_KERNEL 551 552menu "Power management options" 553 554source "kernel/power/Kconfig" 555 556endmenu 557 558source "drivers/firmware/Kconfig" 559