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