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