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