tjh.dev / kernel
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kernel / arch / loongarch / Kconfig
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1# SPDX-License-Identifier: GPL-2.0 2config LOONGARCH 3 bool 4 default y 5 select ACPI 6 select ACPI_GENERIC_GSI if ACPI 7 select ACPI_MCFG if ACPI 8 select ACPI_HOTPLUG_CPU if ACPI_PROCESSOR && HOTPLUG_CPU 9 select ACPI_PPTT if ACPI 10 select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI 11 select ARCH_BINFMT_ELF_STATE 12 select ARCH_NEEDS_DEFER_KASAN 13 select ARCH_DISABLE_KASAN_INLINE 14 select ARCH_ENABLE_MEMORY_HOTPLUG 15 select ARCH_ENABLE_MEMORY_HOTREMOVE 16 select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE 17 select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI 18 select ARCH_HAS_CPU_FINALIZE_INIT 19 select ARCH_HAS_CURRENT_STACK_POINTER 20 select ARCH_HAS_DEBUG_VM_PGTABLE 21 select ARCH_HAS_FAST_MULTIPLIER 22 select ARCH_HAS_FORTIFY_SOURCE 23 select ARCH_HAS_KCOV 24 select ARCH_HAS_KERNEL_FPU_SUPPORT if CPU_HAS_FPU 25 select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS 26 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE 27 select ARCH_HAS_PREEMPT_LAZY 28 select ARCH_HAS_PTE_SPECIAL 29 select ARCH_HAS_SET_MEMORY 30 select ARCH_HAS_SET_DIRECT_MAP 31 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 32 select ARCH_HAS_UBSAN 33 select ARCH_HAS_VDSO_ARCH_DATA 34 select ARCH_INLINE_READ_LOCK if !PREEMPTION 35 select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION 36 select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION 37 select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION 38 select ARCH_INLINE_READ_UNLOCK if !PREEMPTION 39 select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION 40 select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION 41 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION 42 select ARCH_INLINE_WRITE_LOCK if !PREEMPTION 43 select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION 44 select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION 45 select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION 46 select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION 47 select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION 48 select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION 49 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION 50 select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION 51 select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION 52 select ARCH_INLINE_SPIN_LOCK if !PREEMPTION 53 select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION 54 select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION 55 select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION 56 select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION 57 select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION 58 select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION 59 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION 60 select ARCH_KEEP_MEMBLOCK 61 select ARCH_MIGHT_HAVE_PC_PARPORT 62 select ARCH_MIGHT_HAVE_PC_SERIO 63 select ARCH_SPARSEMEM_ENABLE 64 select ARCH_STACKWALK 65 select ARCH_SUPPORTS_ACPI 66 select ARCH_SUPPORTS_ATOMIC_RMW 67 select ARCH_SUPPORTS_HUGETLBFS 68 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 69 select ARCH_SUPPORTS_LTO_CLANG 70 select ARCH_SUPPORTS_LTO_CLANG_THIN 71 select ARCH_SUPPORTS_MSEAL_SYSTEM_MAPPINGS 72 select ARCH_SUPPORTS_NUMA_BALANCING 73 select ARCH_SUPPORTS_PER_VMA_LOCK 74 select ARCH_SUPPORTS_RT 75 select ARCH_SUPPORTS_SCHED_SMT if SMP 76 select ARCH_SUPPORTS_SCHED_MC if SMP 77 select ARCH_USE_BUILTIN_BSWAP 78 select ARCH_USE_CMPXCHG_LOCKREF 79 select ARCH_USE_MEMTEST 80 select ARCH_USE_QUEUED_RWLOCKS 81 select ARCH_USE_QUEUED_SPINLOCKS 82 select ARCH_WANT_DEFAULT_BPF_JIT 83 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT 84 select ARCH_WANT_LD_ORPHAN_WARN 85 select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP 86 select ARCH_WANTS_NO_INSTR 87 select ARCH_WANTS_THP_SWAP if HAVE_ARCH_TRANSPARENT_HUGEPAGE 88 select BUILDTIME_TABLE_SORT 89 select COMMON_CLK 90 select CPU_PM 91 select EDAC_SUPPORT 92 select EFI 93 select GENERIC_CLOCKEVENTS 94 select GENERIC_CMOS_UPDATE 95 select GENERIC_CPU_AUTOPROBE 96 select GENERIC_CPU_DEVICES 97 select GENERIC_CPU_VULNERABILITIES 98 select GENERIC_ENTRY 99 select GENERIC_GETTIMEOFDAY 100 select GENERIC_IOREMAP if !ARCH_IOREMAP 101 select GENERIC_IRQ_MATRIX_ALLOCATOR 102 select GENERIC_IRQ_MULTI_HANDLER 103 select GENERIC_IRQ_PROBE 104 select GENERIC_IRQ_SHOW 105 select GENERIC_LIB_ASHLDI3 106 select GENERIC_LIB_ASHRDI3 107 select GENERIC_LIB_CMPDI2 108 select GENERIC_LIB_LSHRDI3 109 select GENERIC_LIB_UCMPDI2 110 select GENERIC_LIB_DEVMEM_IS_ALLOWED 111 select GENERIC_PCI_IOMAP 112 select GENERIC_SCHED_CLOCK 113 select GENERIC_SMP_IDLE_THREAD 114 select GENERIC_TIME_VSYSCALL 115 select GPIOLIB 116 select HAS_IOPORT 117 select HAVE_ARCH_AUDITSYSCALL 118 select HAVE_ARCH_BITREVERSE 119 select HAVE_ARCH_JUMP_LABEL 120 select HAVE_ARCH_JUMP_LABEL_RELATIVE 121 select HAVE_ARCH_KASAN 122 select HAVE_ARCH_KFENCE 123 select HAVE_ARCH_KGDB if PERF_EVENTS 124 select HAVE_ARCH_KSTACK_ERASE 125 select HAVE_ARCH_MMAP_RND_BITS if MMU 126 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET 127 select HAVE_ARCH_SECCOMP 128 select HAVE_ARCH_SECCOMP_FILTER 129 select HAVE_ARCH_TRACEHOOK 130 select HAVE_ARCH_TRANSPARENT_HUGEPAGE 131 select HAVE_ARCH_USERFAULTFD_MINOR if USERFAULTFD 132 select HAVE_ASM_MODVERSIONS 133 select HAVE_CONTEXT_TRACKING_USER 134 select HAVE_C_RECORDMCOUNT 135 select HAVE_DEBUG_KMEMLEAK 136 select HAVE_DEBUG_STACKOVERFLOW 137 select HAVE_DMA_CONTIGUOUS 138 select HAVE_DYNAMIC_FTRACE 139 select HAVE_DYNAMIC_FTRACE_WITH_ARGS 140 select HAVE_FTRACE_REGS_HAVING_PT_REGS 141 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS 142 select HAVE_DYNAMIC_FTRACE_WITH_REGS 143 select HAVE_EBPF_JIT 144 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !ARCH_STRICT_ALIGN 145 select HAVE_EXIT_THREAD 146 select HAVE_GENERIC_TIF_BITS 147 select HAVE_GUP_FAST 148 select HAVE_FTRACE_GRAPH_FUNC 149 select HAVE_FUNCTION_ARG_ACCESS_API 150 select HAVE_FUNCTION_ERROR_INJECTION 151 select HAVE_FUNCTION_GRAPH_FREGS 152 select HAVE_FUNCTION_GRAPH_TRACER 153 select HAVE_FUNCTION_TRACER 154 select HAVE_GCC_PLUGINS 155 select HAVE_GENERIC_VDSO 156 select HAVE_HW_BREAKPOINT if PERF_EVENTS 157 select HAVE_IOREMAP_PROT 158 select HAVE_IRQ_EXIT_ON_IRQ_STACK 159 select HAVE_IRQ_TIME_ACCOUNTING 160 select HAVE_KPROBES 161 select HAVE_KPROBES_ON_FTRACE 162 select HAVE_KRETPROBES 163 select HAVE_LIVEPATCH 164 select HAVE_MOD_ARCH_SPECIFIC 165 select HAVE_NMI 166 select HAVE_OBJTOOL if AS_HAS_EXPLICIT_RELOCS && AS_HAS_THIN_ADD_SUB 167 select HAVE_PCI 168 select HAVE_PERF_EVENTS 169 select HAVE_PERF_REGS 170 select HAVE_PERF_USER_STACK_DUMP 171 select HAVE_POSIX_CPU_TIMERS_TASK_WORK 172 select HAVE_PREEMPT_DYNAMIC_KEY 173 select HAVE_REGS_AND_STACK_ACCESS_API 174 select HAVE_RELIABLE_STACKTRACE if UNWINDER_ORC 175 select HAVE_RETHOOK 176 select HAVE_RSEQ 177 select HAVE_RUST 178 select HAVE_SAMPLE_FTRACE_DIRECT 179 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI 180 select HAVE_SETUP_PER_CPU_AREA if NUMA 181 select HAVE_STACK_VALIDATION if HAVE_OBJTOOL 182 select HAVE_STACKPROTECTOR 183 select HAVE_SYSCALL_TRACEPOINTS 184 select HAVE_TIF_NOHZ 185 select HAVE_VIRT_CPU_ACCOUNTING_GEN 186 select IRQ_FORCED_THREADING 187 select IRQ_LOONGARCH_CPU 188 select LOCK_MM_AND_FIND_VMA 189 select MMU_GATHER_MERGE_VMAS if MMU 190 select MODULES_USE_ELF_RELA if MODULES 191 select NEED_PER_CPU_EMBED_FIRST_CHUNK 192 select NEED_PER_CPU_PAGE_FIRST_CHUNK 193 select NUMA_MEMBLKS if NUMA 194 select OF 195 select OF_EARLY_FLATTREE 196 select PCI 197 select PCI_DOMAINS_GENERIC 198 select PCI_ECAM if ACPI 199 select PCI_LOONGSON 200 select PCI_MSI_ARCH_FALLBACKS 201 select PCI_QUIRKS 202 select PERF_USE_VMALLOC 203 select RTC_LIB 204 select SPARSE_IRQ 205 select SYSCTL_ARCH_UNALIGN_ALLOW 206 select SYSCTL_ARCH_UNALIGN_NO_WARN 207 select SYSCTL_EXCEPTION_TRACE 208 select SWIOTLB 209 select TRACE_IRQFLAGS_SUPPORT 210 select USE_PERCPU_NUMA_NODE_ID 211 select USER_STACKTRACE_SUPPORT 212 select VDSO_GETRANDOM 213 select ZONE_DMA32 214 215config 32BIT 216 bool 217 218config 64BIT 219 def_bool y 220 221config GENERIC_BUG 222 def_bool y 223 depends on BUG 224 225config GENERIC_BUG_RELATIVE_POINTERS 226 def_bool y 227 depends on GENERIC_BUG 228 229config GENERIC_CALIBRATE_DELAY 230 def_bool y 231 232config GENERIC_CSUM 233 def_bool y 234 235config GENERIC_HWEIGHT 236 def_bool y 237 238config L1_CACHE_SHIFT 239 int 240 default "6" 241 242config LOCKDEP_SUPPORT 243 bool 244 default y 245 246config STACKTRACE_SUPPORT 247 bool 248 default y 249 250# MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the 251# MIPS Loongson code, to preserve Loongson-specific code paths in drivers that 252# are shared between architectures, and specifically expecting the symbols. 253config MACH_LOONGSON32 254 def_bool 32BIT 255 256config MACH_LOONGSON64 257 def_bool 64BIT 258 259config FIX_EARLYCON_MEM 260 def_bool !ARCH_IOREMAP 261 262config PGTABLE_2LEVEL 263 bool 264 265config PGTABLE_3LEVEL 266 bool 267 268config PGTABLE_4LEVEL 269 bool 270 271config PGTABLE_LEVELS 272 int 273 default 2 if PGTABLE_2LEVEL 274 default 3 if PGTABLE_3LEVEL 275 default 4 if PGTABLE_4LEVEL 276 277config SCHED_OMIT_FRAME_POINTER 278 bool 279 default y 280 281config AS_HAS_EXPLICIT_RELOCS 282 def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x)) 283 284config AS_HAS_FCSR_CLASS 285 def_bool $(as-instr,movfcsr2gr \$t0$(comma)\$fcsr0) 286 287config AS_HAS_THIN_ADD_SUB 288 def_bool $(cc-option,-Wa$(comma)-mthin-add-sub) || AS_IS_LLVM 289 290config AS_HAS_LSX_EXTENSION 291 def_bool $(as-instr,vld \$vr0$(comma)\$a0$(comma)0) 292 293config AS_HAS_LASX_EXTENSION 294 def_bool $(as-instr,xvld \$xr0$(comma)\$a0$(comma)0) 295 296config AS_HAS_LBT_EXTENSION 297 def_bool $(as-instr,movscr2gr \$a0$(comma)\$scr0) 298 299config AS_HAS_LVZ_EXTENSION 300 def_bool $(as-instr,hvcl 0) 301 302config CC_HAS_ANNOTATE_TABLEJUMP 303 def_bool $(cc-option,-mannotate-tablejump) 304 305config RUSTC_HAS_ANNOTATE_TABLEJUMP 306 depends on RUST 307 def_bool $(rustc-option,-Cllvm-args=--loongarch-annotate-tablejump) 308 309menu "Kernel type and options" 310 311source "kernel/Kconfig.hz" 312 313choice 314 prompt "Page Table Layout" 315 default 16KB_2LEVEL if 32BIT 316 default 16KB_3LEVEL if 64BIT 317 help 318 Allows choosing the page table layout, which is a combination 319 of page size and page table levels. The size of virtual memory 320 address space are determined by the page table layout. 321 322config 4KB_3LEVEL 323 bool "4KB with 3 levels" 324 select HAVE_PAGE_SIZE_4KB 325 select PGTABLE_3LEVEL 326 help 327 This option selects 4KB page size with 3 level page tables, which 328 support a maximum of 39 bits of application virtual memory. 329 330config 4KB_4LEVEL 331 bool "4KB with 4 levels" 332 select HAVE_PAGE_SIZE_4KB 333 select PGTABLE_4LEVEL 334 help 335 This option selects 4KB page size with 4 level page tables, which 336 support a maximum of 48 bits of application virtual memory. 337 338config 16KB_2LEVEL 339 bool "16KB with 2 levels" 340 select HAVE_PAGE_SIZE_16KB 341 select PGTABLE_2LEVEL 342 help 343 This option selects 16KB page size with 2 level page tables, which 344 support a maximum of 36 bits of application virtual memory. 345 346config 16KB_3LEVEL 347 bool "16KB with 3 levels" 348 select HAVE_PAGE_SIZE_16KB 349 select PGTABLE_3LEVEL 350 help 351 This option selects 16KB page size with 3 level page tables, which 352 support a maximum of 47 bits of application virtual memory. 353 354config 64KB_2LEVEL 355 bool "64KB with 2 levels" 356 select HAVE_PAGE_SIZE_64KB 357 select PGTABLE_2LEVEL 358 help 359 This option selects 64KB page size with 2 level page tables, which 360 support a maximum of 42 bits of application virtual memory. 361 362config 64KB_3LEVEL 363 bool "64KB with 3 levels" 364 select HAVE_PAGE_SIZE_64KB 365 select PGTABLE_3LEVEL 366 help 367 This option selects 64KB page size with 3 level page tables, which 368 support a maximum of 55 bits of application virtual memory. 369 370endchoice 371 372config CMDLINE 373 string "Built-in kernel command line" 374 help 375 For most platforms, the arguments for the kernel's command line 376 are provided at run-time, during boot. However, there are cases 377 where either no arguments are being provided or the provided 378 arguments are insufficient or even invalid. 379 380 When that occurs, it is possible to define a built-in command 381 line here and choose how the kernel should use it later on. 382 383choice 384 prompt "Kernel command line type" 385 default CMDLINE_BOOTLOADER 386 help 387 Choose how the kernel will handle the provided built-in command 388 line. 389 390config CMDLINE_BOOTLOADER 391 bool "Use bootloader kernel arguments if available" 392 help 393 Prefer the command-line passed by the boot loader if available. 394 Use the built-in command line as fallback in case we get nothing 395 during boot. This is the default behaviour. 396 397config CMDLINE_EXTEND 398 bool "Use built-in to extend bootloader kernel arguments" 399 help 400 The built-in command line will be appended to the command- 401 line arguments provided during boot. This is useful in 402 cases where the provided arguments are insufficient and 403 you don't want to or cannot modify them. 404 405config CMDLINE_FORCE 406 bool "Always use the built-in kernel command string" 407 help 408 Always use the built-in command line, even if we get one during 409 boot. This is useful in case you need to override the provided 410 command line on systems where you don't have or want control 411 over it. 412 413endchoice 414 415config BUILTIN_DTB 416 bool "Enable built-in dtb in kernel" 417 depends on OF 418 select GENERIC_BUILTIN_DTB 419 help 420 Some existing systems do not provide a canonical device tree to 421 the kernel at boot time. Let's provide a device tree table in the 422 kernel, keyed by the dts filename, containing the relevant DTBs. 423 424 Built-in DTBs are generic enough and can be used as references. 425 426config BUILTIN_DTB_NAME 427 string "Source file for built-in dtb" 428 depends on BUILTIN_DTB 429 help 430 Base name (without suffix, relative to arch/loongarch/boot/dts/) 431 for the DTS file that will be used to produce the DTB linked into 432 the kernel. 433 434config DMI 435 bool "Enable DMI scanning" 436 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK 437 default y 438 help 439 This enables SMBIOS/DMI feature for systems, and scanning of 440 DMI to identify machine quirks. 441 442config EFI 443 bool "EFI runtime service support" 444 select UCS2_STRING 445 select EFI_RUNTIME_WRAPPERS 446 help 447 This enables the kernel to use EFI runtime services that are 448 available (such as the EFI variable services). 449 450config EFI_STUB 451 bool "EFI boot stub support" 452 default y 453 depends on EFI 454 select EFI_GENERIC_STUB 455 help 456 This kernel feature allows the kernel to be loaded directly by 457 EFI firmware without the use of a bootloader. 458 459config SMP 460 bool "Multi-Processing support" 461 help 462 This enables support for systems with more than one CPU. If you have 463 a system with only one CPU, say N. If you have a system with more 464 than one CPU, say Y. 465 466 If you say N here, the kernel will run on uni- and multiprocessor 467 machines, but will use only one CPU of a multiprocessor machine. If 468 you say Y here, the kernel will run on many, but not all, 469 uniprocessor machines. On a uniprocessor machine, the kernel 470 will run faster if you say N here. 471 472 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>. 473 474 If you don't know what to do here, say N. 475 476config HOTPLUG_CPU 477 bool "Support for hot-pluggable CPUs" 478 depends on SMP 479 select GENERIC_IRQ_MIGRATION 480 help 481 Say Y here to allow turning CPUs off and on. CPUs can be 482 controlled through /sys/devices/system/cpu. 483 (Note: power management support will enable this option 484 automatically on SMP systems. ) 485 Say N if you want to disable CPU hotplug. 486 487config NR_CPUS 488 int "Maximum number of CPUs (2-2048)" 489 range 2 2048 490 default "2048" 491 depends on SMP 492 help 493 This allows you to specify the maximum number of CPUs which this 494 kernel will support. 495 496config NUMA 497 bool "NUMA Support" 498 select SMP 499 help 500 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access) 501 support. This option improves performance on systems with more 502 than one NUMA node; on single node systems it is generally better 503 to leave it disabled. 504 505config NODES_SHIFT 506 int 507 default "6" 508 depends on NUMA 509 510config ARCH_FORCE_MAX_ORDER 511 int "Maximum zone order" 512 default "13" if PAGE_SIZE_64KB 513 default "11" if PAGE_SIZE_16KB 514 default "10" 515 help 516 The kernel memory allocator divides physically contiguous memory 517 blocks into "zones", where each zone is a power of two number of 518 pages. This option selects the largest power of two that the kernel 519 keeps in the memory allocator. If you need to allocate very large 520 blocks of physically contiguous memory, then you may need to 521 increase this value. 522 523 The page size is not necessarily 4KB. Keep this in mind 524 when choosing a value for this option. 525 526config ARCH_IOREMAP 527 bool "Enable LoongArch DMW-based ioremap()" 528 help 529 We use generic TLB-based ioremap() by default since it has page 530 protection support. However, you can enable LoongArch DMW-based 531 ioremap() for better performance. 532 533config ARCH_WRITECOMBINE 534 bool "Enable WriteCombine (WUC) for ioremap()" 535 help 536 LoongArch maintains cache coherency in hardware, but when paired 537 with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which 538 is similar to WriteCombine) is out of the scope of cache coherency 539 machanism for PCIe devices (this is a PCIe protocol violation, which 540 may be fixed in newer chipsets). 541 542 This means WUC can only used for write-only memory regions now, so 543 this option is disabled by default, making WUC silently fallback to 544 SUC for ioremap(). You can enable this option if the kernel is ensured 545 to run on hardware without this bug. 546 547 You can override this setting via writecombine=on/off boot parameter. 548 549config ARCH_STRICT_ALIGN 550 bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT 551 default y 552 help 553 Not all LoongArch cores support h/w unaligned access, we can use 554 -mstrict-align build parameter to prevent unaligned accesses. 555 556 CPUs with h/w unaligned access support: 557 Loongson-2K2000/2K3000 and all of Loongson-3 series processors 558 based on LoongArch. 559 560 CPUs without h/w unaligned access support: 561 Loongson-2K0300/2K0500/2K1000. 562 563 If you want to make sure whether to support unaligned memory access 564 on your hardware, please read the bit 20 (UAL) of CPUCFG1 register. 565 566 This option is enabled by default to make the kernel be able to run 567 on all LoongArch systems. But you can disable it manually if you want 568 to run kernel only on systems with h/w unaligned access support in 569 order to optimise for performance. 570 571config CPU_HAS_AMO 572 bool 573 default 64BIT 574 575config CPU_HAS_FPU 576 bool 577 default y 578 579config CPU_HAS_LSX 580 bool "Support for the Loongson SIMD Extension" 581 depends on AS_HAS_LSX_EXTENSION 582 help 583 Loongson SIMD Extension (LSX) introduces 128 bit wide vector registers 584 and a set of SIMD instructions to operate on them. When this option 585 is enabled the kernel will support allocating & switching LSX 586 vector register contexts. If you know that your kernel will only be 587 running on CPUs which do not support LSX or that your userland will 588 not be making use of it then you may wish to say N here to reduce 589 the size & complexity of your kernel. 590 591 If unsure, say Y. 592 593config CPU_HAS_LASX 594 bool "Support for the Loongson Advanced SIMD Extension" 595 depends on CPU_HAS_LSX 596 depends on AS_HAS_LASX_EXTENSION 597 help 598 Loongson Advanced SIMD Extension (LASX) introduces 256 bit wide vector 599 registers and a set of SIMD instructions to operate on them. When this 600 option is enabled the kernel will support allocating & switching LASX 601 vector register contexts. If you know that your kernel will only be 602 running on CPUs which do not support LASX or that your userland will 603 not be making use of it then you may wish to say N here to reduce 604 the size & complexity of your kernel. 605 606 If unsure, say Y. 607 608config CPU_HAS_LBT 609 bool "Support for the Loongson Binary Translation Extension" 610 depends on AS_HAS_LBT_EXTENSION 611 help 612 Loongson Binary Translation (LBT) introduces 4 scratch registers (SCR0 613 to SCR3), x86/ARM eflags (eflags) and x87 fpu stack pointer (ftop). 614 Enabling this option allows the kernel to allocate and switch registers 615 specific to LBT. 616 617 If you want to use this feature, such as the Loongson Architecture 618 Translator (LAT), say Y. 619 620config CPU_HAS_PREFETCH 621 bool 622 default y 623 624config ARCH_SUPPORTS_KEXEC 625 def_bool y 626 627config ARCH_SUPPORTS_KEXEC_FILE 628 def_bool 64BIT 629 630config ARCH_SELECTS_KEXEC_FILE 631 def_bool 64BIT 632 depends on KEXEC_FILE 633 select KEXEC_ELF 634 select RELOCATABLE 635 select HAVE_IMA_KEXEC if IMA 636 637config ARCH_SUPPORTS_CRASH_DUMP 638 def_bool y 639 640config ARCH_DEFAULT_CRASH_DUMP 641 def_bool y 642 643config ARCH_SELECTS_CRASH_DUMP 644 def_bool y 645 depends on CRASH_DUMP 646 select RELOCATABLE 647 648config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION 649 def_bool CRASH_RESERVE 650 651config RELOCATABLE 652 bool "Relocatable kernel" 653 select ARCH_HAS_RELR 654 help 655 This builds the kernel as a Position Independent Executable (PIE), 656 which retains all relocation metadata required, so as to relocate 657 the kernel binary at runtime to a different virtual address from 658 its link address. 659 660config RANDOMIZE_BASE 661 bool "Randomize the address of the kernel (KASLR)" 662 depends on RELOCATABLE 663 help 664 Randomizes the physical and virtual address at which the 665 kernel image is loaded, as a security feature that 666 deters exploit attempts relying on knowledge of the location 667 of kernel internals. 668 669 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET. 670 671 If unsure, say N. 672 673config RANDOMIZE_BASE_MAX_OFFSET 674 hex "Maximum KASLR offset" if EXPERT 675 depends on RANDOMIZE_BASE 676 range 0x0 0x10000000 677 default "0x01000000" 678 help 679 When KASLR is active, this provides the maximum offset that will 680 be applied to the kernel image. It should be set according to the 681 amount of physical RAM available in the target system. 682 683 This is limited by the size of the lower address memory, 256MB. 684 685source "kernel/livepatch/Kconfig" 686 687config PARAVIRT 688 bool "Enable paravirtualization code" 689 depends on AS_HAS_LVZ_EXTENSION 690 help 691 This changes the kernel so it can modify itself when it is run 692 under a hypervisor, potentially improving performance significantly 693 over full virtualization. However, when run without a hypervisor 694 the kernel is theoretically slower and slightly larger. 695 696config PARAVIRT_TIME_ACCOUNTING 697 bool "Paravirtual steal time accounting" 698 depends on PARAVIRT 699 help 700 Select this option to enable fine granularity task steal time 701 accounting. Time spent executing other tasks in parallel with 702 the current vCPU is discounted from the vCPU power. To account for 703 that, there can be a small performance impact. 704 705 If in doubt, say N here. 706 707endmenu 708 709config ARCH_SELECT_MEMORY_MODEL 710 def_bool y 711 712config ARCH_FLATMEM_ENABLE 713 def_bool y 714 depends on !NUMA 715 716config ARCH_SPARSEMEM_ENABLE 717 def_bool y 718 select SPARSEMEM_VMEMMAP_ENABLE 719 help 720 Say Y to support efficient handling of sparse physical memory, 721 for architectures which are either NUMA (Non-Uniform Memory Access) 722 or have huge holes in the physical address space for other reasons. 723 See <file:Documentation/mm/numa.rst> for more. 724 725config ARCH_MEMORY_PROBE 726 def_bool y 727 depends on MEMORY_HOTPLUG 728 729config MMU 730 bool 731 default y 732 733config ARCH_MMAP_RND_BITS_MIN 734 default 12 735 736config ARCH_MMAP_RND_BITS_MAX 737 default 18 738 739config ARCH_SUPPORTS_UPROBES 740 def_bool y 741 742config KASAN_SHADOW_OFFSET 743 hex 744 default 0x0 745 depends on KASAN 746 747menu "Power management options" 748 749config ARCH_SUSPEND_POSSIBLE 750 def_bool y 751 752config ARCH_HIBERNATION_POSSIBLE 753 def_bool y 754 755source "kernel/power/Kconfig" 756source "drivers/acpi/Kconfig" 757source "drivers/cpufreq/Kconfig" 758 759endmenu 760 761source "arch/loongarch/kvm/Kconfig"