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_CRC32 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_DEVMAP 29 select ARCH_HAS_PTE_SPECIAL 30 select ARCH_HAS_SET_MEMORY 31 select ARCH_HAS_SET_DIRECT_MAP 32 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 33 select ARCH_HAS_UBSAN 34 select ARCH_HAS_VDSO_ARCH_DATA 35 select ARCH_INLINE_READ_LOCK if !PREEMPTION 36 select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION 37 select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION 38 select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION 39 select ARCH_INLINE_READ_UNLOCK if !PREEMPTION 40 select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION 41 select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION 42 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION 43 select ARCH_INLINE_WRITE_LOCK if !PREEMPTION 44 select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION 45 select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION 46 select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION 47 select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION 48 select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION 49 select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION 50 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION 51 select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION 52 select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION 53 select ARCH_INLINE_SPIN_LOCK if !PREEMPTION 54 select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION 55 select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION 56 select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION 57 select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION 58 select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION 59 select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION 60 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION 61 select ARCH_KEEP_MEMBLOCK 62 select ARCH_MIGHT_HAVE_PC_PARPORT 63 select ARCH_MIGHT_HAVE_PC_SERIO 64 select ARCH_SPARSEMEM_ENABLE 65 select ARCH_STACKWALK 66 select ARCH_SUPPORTS_ACPI 67 select ARCH_SUPPORTS_ATOMIC_RMW 68 select ARCH_SUPPORTS_HUGETLBFS 69 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 70 select ARCH_SUPPORTS_LTO_CLANG 71 select ARCH_SUPPORTS_LTO_CLANG_THIN 72 select ARCH_SUPPORTS_MSEAL_SYSTEM_MAPPINGS 73 select ARCH_SUPPORTS_NUMA_BALANCING 74 select ARCH_SUPPORTS_RT 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 GENERIC_VDSO_DATA_STORE 114 select GENERIC_VDSO_TIME_NS 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_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_STACKLEAK 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_GUP_FAST 146 select HAVE_FTRACE_GRAPH_FUNC 147 select HAVE_FTRACE_MCOUNT_RECORD 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 304menu "Kernel type and options" 305 306source "kernel/Kconfig.hz" 307 308choice 309 prompt "Page Table Layout" 310 default 16KB_2LEVEL if 32BIT 311 default 16KB_3LEVEL if 64BIT 312 help 313 Allows choosing the page table layout, which is a combination 314 of page size and page table levels. The size of virtual memory 315 address space are determined by the page table layout. 316 317config 4KB_3LEVEL 318 bool "4KB with 3 levels" 319 select HAVE_PAGE_SIZE_4KB 320 select PGTABLE_3LEVEL 321 help 322 This option selects 4KB page size with 3 level page tables, which 323 support a maximum of 39 bits of application virtual memory. 324 325config 4KB_4LEVEL 326 bool "4KB with 4 levels" 327 select HAVE_PAGE_SIZE_4KB 328 select PGTABLE_4LEVEL 329 help 330 This option selects 4KB page size with 4 level page tables, which 331 support a maximum of 48 bits of application virtual memory. 332 333config 16KB_2LEVEL 334 bool "16KB with 2 levels" 335 select HAVE_PAGE_SIZE_16KB 336 select PGTABLE_2LEVEL 337 help 338 This option selects 16KB page size with 2 level page tables, which 339 support a maximum of 36 bits of application virtual memory. 340 341config 16KB_3LEVEL 342 bool "16KB with 3 levels" 343 select HAVE_PAGE_SIZE_16KB 344 select PGTABLE_3LEVEL 345 help 346 This option selects 16KB page size with 3 level page tables, which 347 support a maximum of 47 bits of application virtual memory. 348 349config 64KB_2LEVEL 350 bool "64KB with 2 levels" 351 select HAVE_PAGE_SIZE_64KB 352 select PGTABLE_2LEVEL 353 help 354 This option selects 64KB page size with 2 level page tables, which 355 support a maximum of 42 bits of application virtual memory. 356 357config 64KB_3LEVEL 358 bool "64KB with 3 levels" 359 select HAVE_PAGE_SIZE_64KB 360 select PGTABLE_3LEVEL 361 help 362 This option selects 64KB page size with 3 level page tables, which 363 support a maximum of 55 bits of application virtual memory. 364 365endchoice 366 367config CMDLINE 368 string "Built-in kernel command line" 369 help 370 For most platforms, the arguments for the kernel's command line 371 are provided at run-time, during boot. However, there are cases 372 where either no arguments are being provided or the provided 373 arguments are insufficient or even invalid. 374 375 When that occurs, it is possible to define a built-in command 376 line here and choose how the kernel should use it later on. 377 378choice 379 prompt "Kernel command line type" 380 default CMDLINE_BOOTLOADER 381 help 382 Choose how the kernel will handle the provided built-in command 383 line. 384 385config CMDLINE_BOOTLOADER 386 bool "Use bootloader kernel arguments if available" 387 help 388 Prefer the command-line passed by the boot loader if available. 389 Use the built-in command line as fallback in case we get nothing 390 during boot. This is the default behaviour. 391 392config CMDLINE_EXTEND 393 bool "Use built-in to extend bootloader kernel arguments" 394 help 395 The built-in command line will be appended to the command- 396 line arguments provided during boot. This is useful in 397 cases where the provided arguments are insufficient and 398 you don't want to or cannot modify them. 399 400config CMDLINE_FORCE 401 bool "Always use the built-in kernel command string" 402 help 403 Always use the built-in command line, even if we get one during 404 boot. This is useful in case you need to override the provided 405 command line on systems where you don't have or want control 406 over it. 407 408endchoice 409 410config BUILTIN_DTB 411 bool "Enable built-in dtb in kernel" 412 depends on OF 413 select GENERIC_BUILTIN_DTB 414 help 415 Some existing systems do not provide a canonical device tree to 416 the kernel at boot time. Let's provide a device tree table in the 417 kernel, keyed by the dts filename, containing the relevant DTBs. 418 419 Built-in DTBs are generic enough and can be used as references. 420 421config BUILTIN_DTB_NAME 422 string "Source file for built-in dtb" 423 depends on BUILTIN_DTB 424 help 425 Base name (without suffix, relative to arch/loongarch/boot/dts/) 426 for the DTS file that will be used to produce the DTB linked into 427 the kernel. 428 429config DMI 430 bool "Enable DMI scanning" 431 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK 432 default y 433 help 434 This enables SMBIOS/DMI feature for systems, and scanning of 435 DMI to identify machine quirks. 436 437config EFI 438 bool "EFI runtime service support" 439 select UCS2_STRING 440 select EFI_RUNTIME_WRAPPERS 441 help 442 This enables the kernel to use EFI runtime services that are 443 available (such as the EFI variable services). 444 445config EFI_STUB 446 bool "EFI boot stub support" 447 default y 448 depends on EFI 449 select EFI_GENERIC_STUB 450 help 451 This kernel feature allows the kernel to be loaded directly by 452 EFI firmware without the use of a bootloader. 453 454config SCHED_SMT 455 bool "SMT scheduler support" 456 depends on SMP 457 default y 458 help 459 Improves scheduler's performance when there are multiple 460 threads in one physical core. 461 462config SCHED_MC 463 bool "Multi-core scheduler support" 464 depends on SMP 465 default y 466 help 467 Multi-core scheduler support improves the CPU scheduler's decision 468 making when dealing with multi-core CPU chips at a cost of slightly 469 increased overhead in some places. 470 471config SMP 472 bool "Multi-Processing support" 473 help 474 This enables support for systems with more than one CPU. If you have 475 a system with only one CPU, say N. If you have a system with more 476 than one CPU, say Y. 477 478 If you say N here, the kernel will run on uni- and multiprocessor 479 machines, but will use only one CPU of a multiprocessor machine. If 480 you say Y here, the kernel will run on many, but not all, 481 uniprocessor machines. On a uniprocessor machine, the kernel 482 will run faster if you say N here. 483 484 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>. 485 486 If you don't know what to do here, say N. 487 488config HOTPLUG_CPU 489 bool "Support for hot-pluggable CPUs" 490 depends on SMP 491 select GENERIC_IRQ_MIGRATION 492 help 493 Say Y here to allow turning CPUs off and on. CPUs can be 494 controlled through /sys/devices/system/cpu. 495 (Note: power management support will enable this option 496 automatically on SMP systems. ) 497 Say N if you want to disable CPU hotplug. 498 499config NR_CPUS 500 int "Maximum number of CPUs (2-2048)" 501 range 2 2048 502 default "2048" 503 depends on SMP 504 help 505 This allows you to specify the maximum number of CPUs which this 506 kernel will support. 507 508config NUMA 509 bool "NUMA Support" 510 select SMP 511 help 512 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access) 513 support. This option improves performance on systems with more 514 than one NUMA node; on single node systems it is generally better 515 to leave it disabled. 516 517config NODES_SHIFT 518 int 519 default "6" 520 depends on NUMA 521 522config ARCH_FORCE_MAX_ORDER 523 int "Maximum zone order" 524 default "13" if PAGE_SIZE_64KB 525 default "11" if PAGE_SIZE_16KB 526 default "10" 527 help 528 The kernel memory allocator divides physically contiguous memory 529 blocks into "zones", where each zone is a power of two number of 530 pages. This option selects the largest power of two that the kernel 531 keeps in the memory allocator. If you need to allocate very large 532 blocks of physically contiguous memory, then you may need to 533 increase this value. 534 535 The page size is not necessarily 4KB. Keep this in mind 536 when choosing a value for this option. 537 538config ARCH_IOREMAP 539 bool "Enable LoongArch DMW-based ioremap()" 540 help 541 We use generic TLB-based ioremap() by default since it has page 542 protection support. However, you can enable LoongArch DMW-based 543 ioremap() for better performance. 544 545config ARCH_WRITECOMBINE 546 bool "Enable WriteCombine (WUC) for ioremap()" 547 help 548 LoongArch maintains cache coherency in hardware, but when paired 549 with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which 550 is similar to WriteCombine) is out of the scope of cache coherency 551 machanism for PCIe devices (this is a PCIe protocol violation, which 552 may be fixed in newer chipsets). 553 554 This means WUC can only used for write-only memory regions now, so 555 this option is disabled by default, making WUC silently fallback to 556 SUC for ioremap(). You can enable this option if the kernel is ensured 557 to run on hardware without this bug. 558 559 You can override this setting via writecombine=on/off boot parameter. 560 561config ARCH_STRICT_ALIGN 562 bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT 563 default y 564 help 565 Not all LoongArch cores support h/w unaligned access, we can use 566 -mstrict-align build parameter to prevent unaligned accesses. 567 568 CPUs with h/w unaligned access support: 569 Loongson-2K2000/2K3000/3A5000/3C5000/3D5000. 570 571 CPUs without h/w unaligned access support: 572 Loongson-2K500/2K1000. 573 574 This option is enabled by default to make the kernel be able to run 575 on all LoongArch systems. But you can disable it manually if you want 576 to run kernel only on systems with h/w unaligned access support in 577 order to optimise for performance. 578 579config CPU_HAS_FPU 580 bool 581 default y 582 583config CPU_HAS_LSX 584 bool "Support for the Loongson SIMD Extension" 585 depends on AS_HAS_LSX_EXTENSION 586 help 587 Loongson SIMD Extension (LSX) introduces 128 bit wide vector registers 588 and a set of SIMD instructions to operate on them. When this option 589 is enabled the kernel will support allocating & switching LSX 590 vector register contexts. If you know that your kernel will only be 591 running on CPUs which do not support LSX or that your userland will 592 not be making use of it then you may wish to say N here to reduce 593 the size & complexity of your kernel. 594 595 If unsure, say Y. 596 597config CPU_HAS_LASX 598 bool "Support for the Loongson Advanced SIMD Extension" 599 depends on CPU_HAS_LSX 600 depends on AS_HAS_LASX_EXTENSION 601 help 602 Loongson Advanced SIMD Extension (LASX) introduces 256 bit wide vector 603 registers and a set of SIMD instructions to operate on them. When this 604 option is enabled the kernel will support allocating & switching LASX 605 vector register contexts. If you know that your kernel will only be 606 running on CPUs which do not support LASX or that your userland will 607 not be making use of it then you may wish to say N here to reduce 608 the size & complexity of your kernel. 609 610 If unsure, say Y. 611 612config CPU_HAS_LBT 613 bool "Support for the Loongson Binary Translation Extension" 614 depends on AS_HAS_LBT_EXTENSION 615 help 616 Loongson Binary Translation (LBT) introduces 4 scratch registers (SCR0 617 to SCR3), x86/ARM eflags (eflags) and x87 fpu stack pointer (ftop). 618 Enabling this option allows the kernel to allocate and switch registers 619 specific to LBT. 620 621 If you want to use this feature, such as the Loongson Architecture 622 Translator (LAT), say Y. 623 624config CPU_HAS_PREFETCH 625 bool 626 default y 627 628config ARCH_SUPPORTS_KEXEC 629 def_bool y 630 631config ARCH_SUPPORTS_CRASH_DUMP 632 def_bool y 633 634config ARCH_DEFAULT_CRASH_DUMP 635 def_bool y 636 637config ARCH_SELECTS_CRASH_DUMP 638 def_bool y 639 depends on CRASH_DUMP 640 select RELOCATABLE 641 642config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION 643 def_bool CRASH_RESERVE 644 645config RELOCATABLE 646 bool "Relocatable kernel" 647 select ARCH_HAS_RELR 648 help 649 This builds the kernel as a Position Independent Executable (PIE), 650 which retains all relocation metadata required, so as to relocate 651 the kernel binary at runtime to a different virtual address from 652 its link address. 653 654config RANDOMIZE_BASE 655 bool "Randomize the address of the kernel (KASLR)" 656 depends on RELOCATABLE 657 help 658 Randomizes the physical and virtual address at which the 659 kernel image is loaded, as a security feature that 660 deters exploit attempts relying on knowledge of the location 661 of kernel internals. 662 663 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET. 664 665 If unsure, say N. 666 667config RANDOMIZE_BASE_MAX_OFFSET 668 hex "Maximum KASLR offset" if EXPERT 669 depends on RANDOMIZE_BASE 670 range 0x0 0x10000000 671 default "0x01000000" 672 help 673 When KASLR is active, this provides the maximum offset that will 674 be applied to the kernel image. It should be set according to the 675 amount of physical RAM available in the target system. 676 677 This is limited by the size of the lower address memory, 256MB. 678 679source "kernel/livepatch/Kconfig" 680 681config PARAVIRT 682 bool "Enable paravirtualization code" 683 depends on AS_HAS_LVZ_EXTENSION 684 help 685 This changes the kernel so it can modify itself when it is run 686 under a hypervisor, potentially improving performance significantly 687 over full virtualization. However, when run without a hypervisor 688 the kernel is theoretically slower and slightly larger. 689 690config PARAVIRT_TIME_ACCOUNTING 691 bool "Paravirtual steal time accounting" 692 depends on PARAVIRT 693 help 694 Select this option to enable fine granularity task steal time 695 accounting. Time spent executing other tasks in parallel with 696 the current vCPU is discounted from the vCPU power. To account for 697 that, there can be a small performance impact. 698 699 If in doubt, say N here. 700 701endmenu 702 703config ARCH_SELECT_MEMORY_MODEL 704 def_bool y 705 706config ARCH_FLATMEM_ENABLE 707 def_bool y 708 depends on !NUMA 709 710config ARCH_SPARSEMEM_ENABLE 711 def_bool y 712 select SPARSEMEM_VMEMMAP_ENABLE 713 help 714 Say Y to support efficient handling of sparse physical memory, 715 for architectures which are either NUMA (Non-Uniform Memory Access) 716 or have huge holes in the physical address space for other reasons. 717 See <file:Documentation/mm/numa.rst> for more. 718 719config ARCH_MEMORY_PROBE 720 def_bool y 721 depends on MEMORY_HOTPLUG 722 723config MMU 724 bool 725 default y 726 727config ARCH_MMAP_RND_BITS_MIN 728 default 12 729 730config ARCH_MMAP_RND_BITS_MAX 731 default 18 732 733config ARCH_SUPPORTS_UPROBES 734 def_bool y 735 736config KASAN_SHADOW_OFFSET 737 hex 738 default 0x0 739 depends on KASAN 740 741menu "Power management options" 742 743config ARCH_SUSPEND_POSSIBLE 744 def_bool y 745 746config ARCH_HIBERNATION_POSSIBLE 747 def_bool y 748 749source "kernel/power/Kconfig" 750source "drivers/acpi/Kconfig" 751source "drivers/cpufreq/Kconfig" 752 753endmenu 754 755source "arch/loongarch/kvm/Kconfig" 756