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_DEVMAP 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_USE_BUILTIN_BSWAP 75 select ARCH_USE_CMPXCHG_LOCKREF 76 select ARCH_USE_MEMTEST 77 select ARCH_USE_QUEUED_RWLOCKS 78 select ARCH_USE_QUEUED_SPINLOCKS 79 select ARCH_WANT_DEFAULT_BPF_JIT 80 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT 81 select ARCH_WANT_LD_ORPHAN_WARN 82 select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP 83 select ARCH_WANTS_NO_INSTR 84 select ARCH_WANTS_THP_SWAP if HAVE_ARCH_TRANSPARENT_HUGEPAGE 85 select BUILDTIME_TABLE_SORT 86 select COMMON_CLK 87 select CPU_PM 88 select EDAC_SUPPORT 89 select EFI 90 select GENERIC_CLOCKEVENTS 91 select GENERIC_CMOS_UPDATE 92 select GENERIC_CPU_AUTOPROBE 93 select GENERIC_CPU_DEVICES 94 select GENERIC_CPU_VULNERABILITIES 95 select GENERIC_ENTRY 96 select GENERIC_GETTIMEOFDAY 97 select GENERIC_IOREMAP if !ARCH_IOREMAP 98 select GENERIC_IRQ_MATRIX_ALLOCATOR 99 select GENERIC_IRQ_MULTI_HANDLER 100 select GENERIC_IRQ_PROBE 101 select GENERIC_IRQ_SHOW 102 select GENERIC_LIB_ASHLDI3 103 select GENERIC_LIB_ASHRDI3 104 select GENERIC_LIB_CMPDI2 105 select GENERIC_LIB_LSHRDI3 106 select GENERIC_LIB_UCMPDI2 107 select GENERIC_LIB_DEVMEM_IS_ALLOWED 108 select GENERIC_PCI_IOMAP 109 select GENERIC_SCHED_CLOCK 110 select GENERIC_SMP_IDLE_THREAD 111 select GENERIC_TIME_VSYSCALL 112 select GENERIC_VDSO_DATA_STORE 113 select GENERIC_VDSO_TIME_NS 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_GUP_FAST 145 select HAVE_FTRACE_GRAPH_FUNC 146 select HAVE_FTRACE_MCOUNT_RECORD 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 303menu "Kernel type and options" 304 305source "kernel/Kconfig.hz" 306 307choice 308 prompt "Page Table Layout" 309 default 16KB_2LEVEL if 32BIT 310 default 16KB_3LEVEL if 64BIT 311 help 312 Allows choosing the page table layout, which is a combination 313 of page size and page table levels. The size of virtual memory 314 address space are determined by the page table layout. 315 316config 4KB_3LEVEL 317 bool "4KB with 3 levels" 318 select HAVE_PAGE_SIZE_4KB 319 select PGTABLE_3LEVEL 320 help 321 This option selects 4KB page size with 3 level page tables, which 322 support a maximum of 39 bits of application virtual memory. 323 324config 4KB_4LEVEL 325 bool "4KB with 4 levels" 326 select HAVE_PAGE_SIZE_4KB 327 select PGTABLE_4LEVEL 328 help 329 This option selects 4KB page size with 4 level page tables, which 330 support a maximum of 48 bits of application virtual memory. 331 332config 16KB_2LEVEL 333 bool "16KB with 2 levels" 334 select HAVE_PAGE_SIZE_16KB 335 select PGTABLE_2LEVEL 336 help 337 This option selects 16KB page size with 2 level page tables, which 338 support a maximum of 36 bits of application virtual memory. 339 340config 16KB_3LEVEL 341 bool "16KB with 3 levels" 342 select HAVE_PAGE_SIZE_16KB 343 select PGTABLE_3LEVEL 344 help 345 This option selects 16KB page size with 3 level page tables, which 346 support a maximum of 47 bits of application virtual memory. 347 348config 64KB_2LEVEL 349 bool "64KB with 2 levels" 350 select HAVE_PAGE_SIZE_64KB 351 select PGTABLE_2LEVEL 352 help 353 This option selects 64KB page size with 2 level page tables, which 354 support a maximum of 42 bits of application virtual memory. 355 356config 64KB_3LEVEL 357 bool "64KB with 3 levels" 358 select HAVE_PAGE_SIZE_64KB 359 select PGTABLE_3LEVEL 360 help 361 This option selects 64KB page size with 3 level page tables, which 362 support a maximum of 55 bits of application virtual memory. 363 364endchoice 365 366config CMDLINE 367 string "Built-in kernel command line" 368 help 369 For most platforms, the arguments for the kernel's command line 370 are provided at run-time, during boot. However, there are cases 371 where either no arguments are being provided or the provided 372 arguments are insufficient or even invalid. 373 374 When that occurs, it is possible to define a built-in command 375 line here and choose how the kernel should use it later on. 376 377choice 378 prompt "Kernel command line type" 379 default CMDLINE_BOOTLOADER 380 help 381 Choose how the kernel will handle the provided built-in command 382 line. 383 384config CMDLINE_BOOTLOADER 385 bool "Use bootloader kernel arguments if available" 386 help 387 Prefer the command-line passed by the boot loader if available. 388 Use the built-in command line as fallback in case we get nothing 389 during boot. This is the default behaviour. 390 391config CMDLINE_EXTEND 392 bool "Use built-in to extend bootloader kernel arguments" 393 help 394 The built-in command line will be appended to the command- 395 line arguments provided during boot. This is useful in 396 cases where the provided arguments are insufficient and 397 you don't want to or cannot modify them. 398 399config CMDLINE_FORCE 400 bool "Always use the built-in kernel command string" 401 help 402 Always use the built-in command line, even if we get one during 403 boot. This is useful in case you need to override the provided 404 command line on systems where you don't have or want control 405 over it. 406 407endchoice 408 409config BUILTIN_DTB 410 bool "Enable built-in dtb in kernel" 411 depends on OF 412 select GENERIC_BUILTIN_DTB 413 help 414 Some existing systems do not provide a canonical device tree to 415 the kernel at boot time. Let's provide a device tree table in the 416 kernel, keyed by the dts filename, containing the relevant DTBs. 417 418 Built-in DTBs are generic enough and can be used as references. 419 420config BUILTIN_DTB_NAME 421 string "Source file for built-in dtb" 422 depends on BUILTIN_DTB 423 help 424 Base name (without suffix, relative to arch/loongarch/boot/dts/) 425 for the DTS file that will be used to produce the DTB linked into 426 the kernel. 427 428config DMI 429 bool "Enable DMI scanning" 430 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK 431 default y 432 help 433 This enables SMBIOS/DMI feature for systems, and scanning of 434 DMI to identify machine quirks. 435 436config EFI 437 bool "EFI runtime service support" 438 select UCS2_STRING 439 select EFI_RUNTIME_WRAPPERS 440 help 441 This enables the kernel to use EFI runtime services that are 442 available (such as the EFI variable services). 443 444config EFI_STUB 445 bool "EFI boot stub support" 446 default y 447 depends on EFI 448 select EFI_GENERIC_STUB 449 help 450 This kernel feature allows the kernel to be loaded directly by 451 EFI firmware without the use of a bootloader. 452 453config SCHED_SMT 454 bool "SMT scheduler support" 455 depends on SMP 456 default y 457 help 458 Improves scheduler's performance when there are multiple 459 threads in one physical core. 460 461config SCHED_MC 462 bool "Multi-core scheduler support" 463 depends on SMP 464 default y 465 help 466 Multi-core scheduler support improves the CPU scheduler's decision 467 making when dealing with multi-core CPU chips at a cost of slightly 468 increased overhead in some places. 469 470config SMP 471 bool "Multi-Processing support" 472 help 473 This enables support for systems with more than one CPU. If you have 474 a system with only one CPU, say N. If you have a system with more 475 than one CPU, say Y. 476 477 If you say N here, the kernel will run on uni- and multiprocessor 478 machines, but will use only one CPU of a multiprocessor machine. If 479 you say Y here, the kernel will run on many, but not all, 480 uniprocessor machines. On a uniprocessor machine, the kernel 481 will run faster if you say N here. 482 483 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>. 484 485 If you don't know what to do here, say N. 486 487config HOTPLUG_CPU 488 bool "Support for hot-pluggable CPUs" 489 depends on SMP 490 select GENERIC_IRQ_MIGRATION 491 help 492 Say Y here to allow turning CPUs off and on. CPUs can be 493 controlled through /sys/devices/system/cpu. 494 (Note: power management support will enable this option 495 automatically on SMP systems. ) 496 Say N if you want to disable CPU hotplug. 497 498config NR_CPUS 499 int "Maximum number of CPUs (2-2048)" 500 range 2 2048 501 default "2048" 502 depends on SMP 503 help 504 This allows you to specify the maximum number of CPUs which this 505 kernel will support. 506 507config NUMA 508 bool "NUMA Support" 509 select SMP 510 help 511 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access) 512 support. This option improves performance on systems with more 513 than one NUMA node; on single node systems it is generally better 514 to leave it disabled. 515 516config NODES_SHIFT 517 int 518 default "6" 519 depends on NUMA 520 521config ARCH_FORCE_MAX_ORDER 522 int "Maximum zone order" 523 default "13" if PAGE_SIZE_64KB 524 default "11" if PAGE_SIZE_16KB 525 default "10" 526 help 527 The kernel memory allocator divides physically contiguous memory 528 blocks into "zones", where each zone is a power of two number of 529 pages. This option selects the largest power of two that the kernel 530 keeps in the memory allocator. If you need to allocate very large 531 blocks of physically contiguous memory, then you may need to 532 increase this value. 533 534 The page size is not necessarily 4KB. Keep this in mind 535 when choosing a value for this option. 536 537config ARCH_IOREMAP 538 bool "Enable LoongArch DMW-based ioremap()" 539 help 540 We use generic TLB-based ioremap() by default since it has page 541 protection support. However, you can enable LoongArch DMW-based 542 ioremap() for better performance. 543 544config ARCH_WRITECOMBINE 545 bool "Enable WriteCombine (WUC) for ioremap()" 546 help 547 LoongArch maintains cache coherency in hardware, but when paired 548 with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which 549 is similar to WriteCombine) is out of the scope of cache coherency 550 machanism for PCIe devices (this is a PCIe protocol violation, which 551 may be fixed in newer chipsets). 552 553 This means WUC can only used for write-only memory regions now, so 554 this option is disabled by default, making WUC silently fallback to 555 SUC for ioremap(). You can enable this option if the kernel is ensured 556 to run on hardware without this bug. 557 558 You can override this setting via writecombine=on/off boot parameter. 559 560config ARCH_STRICT_ALIGN 561 bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT 562 default y 563 help 564 Not all LoongArch cores support h/w unaligned access, we can use 565 -mstrict-align build parameter to prevent unaligned accesses. 566 567 CPUs with h/w unaligned access support: 568 Loongson-2K2000/2K3000/3A5000/3C5000/3D5000. 569 570 CPUs without h/w unaligned access support: 571 Loongson-2K500/2K1000. 572 573 This option is enabled by default to make the kernel be able to run 574 on all LoongArch systems. But you can disable it manually if you want 575 to run kernel only on systems with h/w unaligned access support in 576 order to optimise for performance. 577 578config CPU_HAS_FPU 579 bool 580 default y 581 582config CPU_HAS_LSX 583 bool "Support for the Loongson SIMD Extension" 584 depends on AS_HAS_LSX_EXTENSION 585 help 586 Loongson SIMD Extension (LSX) introduces 128 bit wide vector registers 587 and a set of SIMD instructions to operate on them. When this option 588 is enabled the kernel will support allocating & switching LSX 589 vector register contexts. If you know that your kernel will only be 590 running on CPUs which do not support LSX or that your userland will 591 not be making use of it then you may wish to say N here to reduce 592 the size & complexity of your kernel. 593 594 If unsure, say Y. 595 596config CPU_HAS_LASX 597 bool "Support for the Loongson Advanced SIMD Extension" 598 depends on CPU_HAS_LSX 599 depends on AS_HAS_LASX_EXTENSION 600 help 601 Loongson Advanced SIMD Extension (LASX) introduces 256 bit wide vector 602 registers and a set of SIMD instructions to operate on them. When this 603 option is enabled the kernel will support allocating & switching LASX 604 vector register contexts. If you know that your kernel will only be 605 running on CPUs which do not support LASX or that your userland will 606 not be making use of it then you may wish to say N here to reduce 607 the size & complexity of your kernel. 608 609 If unsure, say Y. 610 611config CPU_HAS_LBT 612 bool "Support for the Loongson Binary Translation Extension" 613 depends on AS_HAS_LBT_EXTENSION 614 help 615 Loongson Binary Translation (LBT) introduces 4 scratch registers (SCR0 616 to SCR3), x86/ARM eflags (eflags) and x87 fpu stack pointer (ftop). 617 Enabling this option allows the kernel to allocate and switch registers 618 specific to LBT. 619 620 If you want to use this feature, such as the Loongson Architecture 621 Translator (LAT), say Y. 622 623config CPU_HAS_PREFETCH 624 bool 625 default y 626 627config ARCH_SUPPORTS_KEXEC 628 def_bool y 629 630config ARCH_SUPPORTS_CRASH_DUMP 631 def_bool y 632 633config ARCH_DEFAULT_CRASH_DUMP 634 def_bool y 635 636config ARCH_SELECTS_CRASH_DUMP 637 def_bool y 638 depends on CRASH_DUMP 639 select RELOCATABLE 640 641config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION 642 def_bool CRASH_RESERVE 643 644config RELOCATABLE 645 bool "Relocatable kernel" 646 select ARCH_HAS_RELR 647 help 648 This builds the kernel as a Position Independent Executable (PIE), 649 which retains all relocation metadata required, so as to relocate 650 the kernel binary at runtime to a different virtual address from 651 its link address. 652 653config RANDOMIZE_BASE 654 bool "Randomize the address of the kernel (KASLR)" 655 depends on RELOCATABLE 656 help 657 Randomizes the physical and virtual address at which the 658 kernel image is loaded, as a security feature that 659 deters exploit attempts relying on knowledge of the location 660 of kernel internals. 661 662 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET. 663 664 If unsure, say N. 665 666config RANDOMIZE_BASE_MAX_OFFSET 667 hex "Maximum KASLR offset" if EXPERT 668 depends on RANDOMIZE_BASE 669 range 0x0 0x10000000 670 default "0x01000000" 671 help 672 When KASLR is active, this provides the maximum offset that will 673 be applied to the kernel image. It should be set according to the 674 amount of physical RAM available in the target system. 675 676 This is limited by the size of the lower address memory, 256MB. 677 678source "kernel/livepatch/Kconfig" 679 680config PARAVIRT 681 bool "Enable paravirtualization code" 682 depends on AS_HAS_LVZ_EXTENSION 683 help 684 This changes the kernel so it can modify itself when it is run 685 under a hypervisor, potentially improving performance significantly 686 over full virtualization. However, when run without a hypervisor 687 the kernel is theoretically slower and slightly larger. 688 689config PARAVIRT_TIME_ACCOUNTING 690 bool "Paravirtual steal time accounting" 691 depends on PARAVIRT 692 help 693 Select this option to enable fine granularity task steal time 694 accounting. Time spent executing other tasks in parallel with 695 the current vCPU is discounted from the vCPU power. To account for 696 that, there can be a small performance impact. 697 698 If in doubt, say N here. 699 700endmenu 701 702config ARCH_SELECT_MEMORY_MODEL 703 def_bool y 704 705config ARCH_FLATMEM_ENABLE 706 def_bool y 707 depends on !NUMA 708 709config ARCH_SPARSEMEM_ENABLE 710 def_bool y 711 select SPARSEMEM_VMEMMAP_ENABLE 712 help 713 Say Y to support efficient handling of sparse physical memory, 714 for architectures which are either NUMA (Non-Uniform Memory Access) 715 or have huge holes in the physical address space for other reasons. 716 See <file:Documentation/mm/numa.rst> for more. 717 718config ARCH_MEMORY_PROBE 719 def_bool y 720 depends on MEMORY_HOTPLUG 721 722config MMU 723 bool 724 default y 725 726config ARCH_MMAP_RND_BITS_MIN 727 default 12 728 729config ARCH_MMAP_RND_BITS_MAX 730 default 18 731 732config ARCH_SUPPORTS_UPROBES 733 def_bool y 734 735config KASAN_SHADOW_OFFSET 736 hex 737 default 0x0 738 depends on KASAN 739 740menu "Power management options" 741 742config ARCH_SUSPEND_POSSIBLE 743 def_bool y 744 745config ARCH_HIBERNATION_POSSIBLE 746 def_bool y 747 748source "kernel/power/Kconfig" 749source "drivers/acpi/Kconfig" 750source "drivers/cpufreq/Kconfig" 751 752endmenu 753 754source "arch/loongarch/kvm/Kconfig" 755