1# SPDX-License-Identifier: GPL-2.0 2config LOONGARCH 3 bool 4 default y 5 select ACPI 6 select ACPI_GENERIC_GSI if ACPI 7 select ACPI_MCFG if ACPI 8 select ACPI_HOTPLUG_CPU if ACPI_PROCESSOR && HOTPLUG_CPU 9 select ACPI_PPTT if ACPI 10 select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI 11 select ARCH_BINFMT_ELF_STATE 12 select ARCH_DISABLE_KASAN_INLINE 13 select ARCH_ENABLE_MEMORY_HOTPLUG 14 select ARCH_ENABLE_MEMORY_HOTREMOVE 15 select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE 16 select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI 17 select ARCH_HAS_CPU_FINALIZE_INIT 18 select ARCH_HAS_CURRENT_STACK_POINTER 19 select ARCH_HAS_DEBUG_VM_PGTABLE 20 select ARCH_HAS_FAST_MULTIPLIER 21 select ARCH_HAS_FORTIFY_SOURCE 22 select ARCH_HAS_KCOV 23 select ARCH_HAS_KERNEL_FPU_SUPPORT if CPU_HAS_FPU 24 select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS 25 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE 26 select ARCH_HAS_PREEMPT_LAZY 27 select ARCH_HAS_PTE_SPECIAL 28 select ARCH_HAS_SET_MEMORY 29 select ARCH_HAS_SET_DIRECT_MAP 30 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 31 select ARCH_HAS_UBSAN 32 select ARCH_HAS_VDSO_ARCH_DATA 33 select ARCH_INLINE_READ_LOCK if !PREEMPTION 34 select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION 35 select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION 36 select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION 37 select ARCH_INLINE_READ_UNLOCK if !PREEMPTION 38 select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION 39 select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION 40 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION 41 select ARCH_INLINE_WRITE_LOCK if !PREEMPTION 42 select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION 43 select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION 44 select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION 45 select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION 46 select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION 47 select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION 48 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION 49 select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION 50 select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION 51 select ARCH_INLINE_SPIN_LOCK if !PREEMPTION 52 select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION 53 select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION 54 select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION 55 select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION 56 select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION 57 select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION 58 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION 59 select ARCH_KEEP_MEMBLOCK 60 select ARCH_MIGHT_HAVE_PC_PARPORT 61 select ARCH_MIGHT_HAVE_PC_SERIO 62 select ARCH_SPARSEMEM_ENABLE 63 select ARCH_STACKWALK 64 select ARCH_SUPPORTS_ACPI 65 select ARCH_SUPPORTS_ATOMIC_RMW 66 select ARCH_SUPPORTS_HUGETLBFS 67 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 68 select ARCH_SUPPORTS_LTO_CLANG 69 select ARCH_SUPPORTS_LTO_CLANG_THIN 70 select ARCH_SUPPORTS_MSEAL_SYSTEM_MAPPINGS 71 select ARCH_SUPPORTS_NUMA_BALANCING 72 select ARCH_SUPPORTS_RT 73 select ARCH_USE_BUILTIN_BSWAP 74 select ARCH_USE_CMPXCHG_LOCKREF 75 select ARCH_USE_MEMTEST 76 select ARCH_USE_QUEUED_RWLOCKS 77 select ARCH_USE_QUEUED_SPINLOCKS 78 select ARCH_WANT_DEFAULT_BPF_JIT 79 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT 80 select ARCH_WANT_LD_ORPHAN_WARN 81 select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP 82 select ARCH_WANTS_NO_INSTR 83 select ARCH_WANTS_THP_SWAP if HAVE_ARCH_TRANSPARENT_HUGEPAGE 84 select BUILDTIME_TABLE_SORT 85 select COMMON_CLK 86 select CPU_PM 87 select EDAC_SUPPORT 88 select EFI 89 select GENERIC_CLOCKEVENTS 90 select GENERIC_CMOS_UPDATE 91 select GENERIC_CPU_AUTOPROBE 92 select GENERIC_CPU_DEVICES 93 select GENERIC_CPU_VULNERABILITIES 94 select GENERIC_ENTRY 95 select GENERIC_GETTIMEOFDAY 96 select GENERIC_IOREMAP if !ARCH_IOREMAP 97 select GENERIC_IRQ_MATRIX_ALLOCATOR 98 select GENERIC_IRQ_MULTI_HANDLER 99 select GENERIC_IRQ_PROBE 100 select GENERIC_IRQ_SHOW 101 select GENERIC_LIB_ASHLDI3 102 select GENERIC_LIB_ASHRDI3 103 select GENERIC_LIB_CMPDI2 104 select GENERIC_LIB_LSHRDI3 105 select GENERIC_LIB_UCMPDI2 106 select GENERIC_LIB_DEVMEM_IS_ALLOWED 107 select GENERIC_PCI_IOMAP 108 select GENERIC_SCHED_CLOCK 109 select GENERIC_SMP_IDLE_THREAD 110 select GENERIC_TIME_VSYSCALL 111 select GENERIC_VDSO_DATA_STORE 112 select GENERIC_VDSO_TIME_NS 113 select GPIOLIB 114 select HAS_IOPORT 115 select HAVE_ARCH_AUDITSYSCALL 116 select HAVE_ARCH_JUMP_LABEL 117 select HAVE_ARCH_JUMP_LABEL_RELATIVE 118 select HAVE_ARCH_KASAN 119 select HAVE_ARCH_KFENCE 120 select HAVE_ARCH_KGDB if PERF_EVENTS 121 select HAVE_ARCH_KSTACK_ERASE 122 select HAVE_ARCH_MMAP_RND_BITS if MMU 123 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET 124 select HAVE_ARCH_SECCOMP 125 select HAVE_ARCH_SECCOMP_FILTER 126 select HAVE_ARCH_TRACEHOOK 127 select HAVE_ARCH_TRANSPARENT_HUGEPAGE 128 select HAVE_ARCH_USERFAULTFD_MINOR if USERFAULTFD 129 select HAVE_ASM_MODVERSIONS 130 select HAVE_CONTEXT_TRACKING_USER 131 select HAVE_C_RECORDMCOUNT 132 select HAVE_DEBUG_KMEMLEAK 133 select HAVE_DEBUG_STACKOVERFLOW 134 select HAVE_DMA_CONTIGUOUS 135 select HAVE_DYNAMIC_FTRACE 136 select HAVE_DYNAMIC_FTRACE_WITH_ARGS 137 select HAVE_FTRACE_REGS_HAVING_PT_REGS 138 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS 139 select HAVE_DYNAMIC_FTRACE_WITH_REGS 140 select HAVE_EBPF_JIT 141 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !ARCH_STRICT_ALIGN 142 select HAVE_EXIT_THREAD 143 select HAVE_GUP_FAST 144 select HAVE_FTRACE_GRAPH_FUNC 145 select HAVE_FUNCTION_ARG_ACCESS_API 146 select HAVE_FUNCTION_ERROR_INJECTION 147 select HAVE_FUNCTION_GRAPH_FREGS 148 select HAVE_FUNCTION_GRAPH_TRACER 149 select HAVE_FUNCTION_TRACER 150 select HAVE_GCC_PLUGINS 151 select HAVE_GENERIC_VDSO 152 select HAVE_HW_BREAKPOINT if PERF_EVENTS 153 select HAVE_IOREMAP_PROT 154 select HAVE_IRQ_EXIT_ON_IRQ_STACK 155 select HAVE_IRQ_TIME_ACCOUNTING 156 select HAVE_KPROBES 157 select HAVE_KPROBES_ON_FTRACE 158 select HAVE_KRETPROBES 159 select HAVE_LIVEPATCH 160 select HAVE_MOD_ARCH_SPECIFIC 161 select HAVE_NMI 162 select HAVE_OBJTOOL if AS_HAS_EXPLICIT_RELOCS && AS_HAS_THIN_ADD_SUB 163 select HAVE_PCI 164 select HAVE_PERF_EVENTS 165 select HAVE_PERF_REGS 166 select HAVE_PERF_USER_STACK_DUMP 167 select HAVE_POSIX_CPU_TIMERS_TASK_WORK 168 select HAVE_PREEMPT_DYNAMIC_KEY 169 select HAVE_REGS_AND_STACK_ACCESS_API 170 select HAVE_RELIABLE_STACKTRACE if UNWINDER_ORC 171 select HAVE_RETHOOK 172 select HAVE_RSEQ 173 select HAVE_RUST 174 select HAVE_SAMPLE_FTRACE_DIRECT 175 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI 176 select HAVE_SETUP_PER_CPU_AREA if NUMA 177 select HAVE_STACK_VALIDATION if HAVE_OBJTOOL 178 select HAVE_STACKPROTECTOR 179 select HAVE_SYSCALL_TRACEPOINTS 180 select HAVE_TIF_NOHZ 181 select HAVE_VIRT_CPU_ACCOUNTING_GEN 182 select IRQ_FORCED_THREADING 183 select IRQ_LOONGARCH_CPU 184 select LOCK_MM_AND_FIND_VMA 185 select MMU_GATHER_MERGE_VMAS if MMU 186 select MODULES_USE_ELF_RELA if MODULES 187 select NEED_PER_CPU_EMBED_FIRST_CHUNK 188 select NEED_PER_CPU_PAGE_FIRST_CHUNK 189 select NUMA_MEMBLKS if NUMA 190 select OF 191 select OF_EARLY_FLATTREE 192 select PCI 193 select PCI_DOMAINS_GENERIC 194 select PCI_ECAM if ACPI 195 select PCI_LOONGSON 196 select PCI_MSI_ARCH_FALLBACKS 197 select PCI_QUIRKS 198 select PERF_USE_VMALLOC 199 select RTC_LIB 200 select SPARSE_IRQ 201 select SYSCTL_ARCH_UNALIGN_ALLOW 202 select SYSCTL_ARCH_UNALIGN_NO_WARN 203 select SYSCTL_EXCEPTION_TRACE 204 select SWIOTLB 205 select TRACE_IRQFLAGS_SUPPORT 206 select USE_PERCPU_NUMA_NODE_ID 207 select USER_STACKTRACE_SUPPORT 208 select VDSO_GETRANDOM 209 select ZONE_DMA32 210 211config 32BIT 212 bool 213 214config 64BIT 215 def_bool y 216 217config GENERIC_BUG 218 def_bool y 219 depends on BUG 220 221config GENERIC_BUG_RELATIVE_POINTERS 222 def_bool y 223 depends on GENERIC_BUG 224 225config GENERIC_CALIBRATE_DELAY 226 def_bool y 227 228config GENERIC_CSUM 229 def_bool y 230 231config GENERIC_HWEIGHT 232 def_bool y 233 234config L1_CACHE_SHIFT 235 int 236 default "6" 237 238config LOCKDEP_SUPPORT 239 bool 240 default y 241 242config STACKTRACE_SUPPORT 243 bool 244 default y 245 246# MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the 247# MIPS Loongson code, to preserve Loongson-specific code paths in drivers that 248# are shared between architectures, and specifically expecting the symbols. 249config MACH_LOONGSON32 250 def_bool 32BIT 251 252config MACH_LOONGSON64 253 def_bool 64BIT 254 255config FIX_EARLYCON_MEM 256 def_bool !ARCH_IOREMAP 257 258config PGTABLE_2LEVEL 259 bool 260 261config PGTABLE_3LEVEL 262 bool 263 264config PGTABLE_4LEVEL 265 bool 266 267config PGTABLE_LEVELS 268 int 269 default 2 if PGTABLE_2LEVEL 270 default 3 if PGTABLE_3LEVEL 271 default 4 if PGTABLE_4LEVEL 272 273config SCHED_OMIT_FRAME_POINTER 274 bool 275 default y 276 277config AS_HAS_EXPLICIT_RELOCS 278 def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x)) 279 280config AS_HAS_FCSR_CLASS 281 def_bool $(as-instr,movfcsr2gr \$t0$(comma)\$fcsr0) 282 283config AS_HAS_THIN_ADD_SUB 284 def_bool $(cc-option,-Wa$(comma)-mthin-add-sub) || AS_IS_LLVM 285 286config AS_HAS_LSX_EXTENSION 287 def_bool $(as-instr,vld \$vr0$(comma)\$a0$(comma)0) 288 289config AS_HAS_LASX_EXTENSION 290 def_bool $(as-instr,xvld \$xr0$(comma)\$a0$(comma)0) 291 292config AS_HAS_LBT_EXTENSION 293 def_bool $(as-instr,movscr2gr \$a0$(comma)\$scr0) 294 295config AS_HAS_LVZ_EXTENSION 296 def_bool $(as-instr,hvcl 0) 297 298config CC_HAS_ANNOTATE_TABLEJUMP 299 def_bool $(cc-option,-mannotate-tablejump) 300 301config RUSTC_HAS_ANNOTATE_TABLEJUMP 302 depends on RUST 303 def_bool $(rustc-option,-Cllvm-args=--loongarch-annotate-tablejump) 304 305menu "Kernel type and options" 306 307source "kernel/Kconfig.hz" 308 309choice 310 prompt "Page Table Layout" 311 default 16KB_2LEVEL if 32BIT 312 default 16KB_3LEVEL if 64BIT 313 help 314 Allows choosing the page table layout, which is a combination 315 of page size and page table levels. The size of virtual memory 316 address space are determined by the page table layout. 317 318config 4KB_3LEVEL 319 bool "4KB with 3 levels" 320 select HAVE_PAGE_SIZE_4KB 321 select PGTABLE_3LEVEL 322 help 323 This option selects 4KB page size with 3 level page tables, which 324 support a maximum of 39 bits of application virtual memory. 325 326config 4KB_4LEVEL 327 bool "4KB with 4 levels" 328 select HAVE_PAGE_SIZE_4KB 329 select PGTABLE_4LEVEL 330 help 331 This option selects 4KB page size with 4 level page tables, which 332 support a maximum of 48 bits of application virtual memory. 333 334config 16KB_2LEVEL 335 bool "16KB with 2 levels" 336 select HAVE_PAGE_SIZE_16KB 337 select PGTABLE_2LEVEL 338 help 339 This option selects 16KB page size with 2 level page tables, which 340 support a maximum of 36 bits of application virtual memory. 341 342config 16KB_3LEVEL 343 bool "16KB with 3 levels" 344 select HAVE_PAGE_SIZE_16KB 345 select PGTABLE_3LEVEL 346 help 347 This option selects 16KB page size with 3 level page tables, which 348 support a maximum of 47 bits of application virtual memory. 349 350config 64KB_2LEVEL 351 bool "64KB with 2 levels" 352 select HAVE_PAGE_SIZE_64KB 353 select PGTABLE_2LEVEL 354 help 355 This option selects 64KB page size with 2 level page tables, which 356 support a maximum of 42 bits of application virtual memory. 357 358config 64KB_3LEVEL 359 bool "64KB with 3 levels" 360 select HAVE_PAGE_SIZE_64KB 361 select PGTABLE_3LEVEL 362 help 363 This option selects 64KB page size with 3 level page tables, which 364 support a maximum of 55 bits of application virtual memory. 365 366endchoice 367 368config CMDLINE 369 string "Built-in kernel command line" 370 help 371 For most platforms, the arguments for the kernel's command line 372 are provided at run-time, during boot. However, there are cases 373 where either no arguments are being provided or the provided 374 arguments are insufficient or even invalid. 375 376 When that occurs, it is possible to define a built-in command 377 line here and choose how the kernel should use it later on. 378 379choice 380 prompt "Kernel command line type" 381 default CMDLINE_BOOTLOADER 382 help 383 Choose how the kernel will handle the provided built-in command 384 line. 385 386config CMDLINE_BOOTLOADER 387 bool "Use bootloader kernel arguments if available" 388 help 389 Prefer the command-line passed by the boot loader if available. 390 Use the built-in command line as fallback in case we get nothing 391 during boot. This is the default behaviour. 392 393config CMDLINE_EXTEND 394 bool "Use built-in to extend bootloader kernel arguments" 395 help 396 The built-in command line will be appended to the command- 397 line arguments provided during boot. This is useful in 398 cases where the provided arguments are insufficient and 399 you don't want to or cannot modify them. 400 401config CMDLINE_FORCE 402 bool "Always use the built-in kernel command string" 403 help 404 Always use the built-in command line, even if we get one during 405 boot. This is useful in case you need to override the provided 406 command line on systems where you don't have or want control 407 over it. 408 409endchoice 410 411config BUILTIN_DTB 412 bool "Enable built-in dtb in kernel" 413 depends on OF 414 select GENERIC_BUILTIN_DTB 415 help 416 Some existing systems do not provide a canonical device tree to 417 the kernel at boot time. Let's provide a device tree table in the 418 kernel, keyed by the dts filename, containing the relevant DTBs. 419 420 Built-in DTBs are generic enough and can be used as references. 421 422config BUILTIN_DTB_NAME 423 string "Source file for built-in dtb" 424 depends on BUILTIN_DTB 425 help 426 Base name (without suffix, relative to arch/loongarch/boot/dts/) 427 for the DTS file that will be used to produce the DTB linked into 428 the kernel. 429 430config DMI 431 bool "Enable DMI scanning" 432 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK 433 default y 434 help 435 This enables SMBIOS/DMI feature for systems, and scanning of 436 DMI to identify machine quirks. 437 438config EFI 439 bool "EFI runtime service support" 440 select UCS2_STRING 441 select EFI_RUNTIME_WRAPPERS 442 help 443 This enables the kernel to use EFI runtime services that are 444 available (such as the EFI variable services). 445 446config EFI_STUB 447 bool "EFI boot stub support" 448 default y 449 depends on EFI 450 select EFI_GENERIC_STUB 451 help 452 This kernel feature allows the kernel to be loaded directly by 453 EFI firmware without the use of a bootloader. 454 455config SCHED_SMT 456 bool "SMT scheduler support" 457 depends on SMP 458 default y 459 help 460 Improves scheduler's performance when there are multiple 461 threads in one physical core. 462 463config SCHED_MC 464 bool "Multi-core scheduler support" 465 depends on SMP 466 default y 467 help 468 Multi-core scheduler support improves the CPU scheduler's decision 469 making when dealing with multi-core CPU chips at a cost of slightly 470 increased overhead in some places. 471 472config SMP 473 bool "Multi-Processing support" 474 help 475 This enables support for systems with more than one CPU. If you have 476 a system with only one CPU, say N. If you have a system with more 477 than one CPU, say Y. 478 479 If you say N here, the kernel will run on uni- and multiprocessor 480 machines, but will use only one CPU of a multiprocessor machine. If 481 you say Y here, the kernel will run on many, but not all, 482 uniprocessor machines. On a uniprocessor machine, the kernel 483 will run faster if you say N here. 484 485 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>. 486 487 If you don't know what to do here, say N. 488 489config HOTPLUG_CPU 490 bool "Support for hot-pluggable CPUs" 491 depends on SMP 492 select GENERIC_IRQ_MIGRATION 493 help 494 Say Y here to allow turning CPUs off and on. CPUs can be 495 controlled through /sys/devices/system/cpu. 496 (Note: power management support will enable this option 497 automatically on SMP systems. ) 498 Say N if you want to disable CPU hotplug. 499 500config NR_CPUS 501 int "Maximum number of CPUs (2-2048)" 502 range 2 2048 503 default "2048" 504 depends on SMP 505 help 506 This allows you to specify the maximum number of CPUs which this 507 kernel will support. 508 509config NUMA 510 bool "NUMA Support" 511 select SMP 512 help 513 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access) 514 support. This option improves performance on systems with more 515 than one NUMA node; on single node systems it is generally better 516 to leave it disabled. 517 518config NODES_SHIFT 519 int 520 default "6" 521 depends on NUMA 522 523config ARCH_FORCE_MAX_ORDER 524 int "Maximum zone order" 525 default "13" if PAGE_SIZE_64KB 526 default "11" if PAGE_SIZE_16KB 527 default "10" 528 help 529 The kernel memory allocator divides physically contiguous memory 530 blocks into "zones", where each zone is a power of two number of 531 pages. This option selects the largest power of two that the kernel 532 keeps in the memory allocator. If you need to allocate very large 533 blocks of physically contiguous memory, then you may need to 534 increase this value. 535 536 The page size is not necessarily 4KB. Keep this in mind 537 when choosing a value for this option. 538 539config ARCH_IOREMAP 540 bool "Enable LoongArch DMW-based ioremap()" 541 help 542 We use generic TLB-based ioremap() by default since it has page 543 protection support. However, you can enable LoongArch DMW-based 544 ioremap() for better performance. 545 546config ARCH_WRITECOMBINE 547 bool "Enable WriteCombine (WUC) for ioremap()" 548 help 549 LoongArch maintains cache coherency in hardware, but when paired 550 with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which 551 is similar to WriteCombine) is out of the scope of cache coherency 552 machanism for PCIe devices (this is a PCIe protocol violation, which 553 may be fixed in newer chipsets). 554 555 This means WUC can only used for write-only memory regions now, so 556 this option is disabled by default, making WUC silently fallback to 557 SUC for ioremap(). You can enable this option if the kernel is ensured 558 to run on hardware without this bug. 559 560 You can override this setting via writecombine=on/off boot parameter. 561 562config ARCH_STRICT_ALIGN 563 bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT 564 default y 565 help 566 Not all LoongArch cores support h/w unaligned access, we can use 567 -mstrict-align build parameter to prevent unaligned accesses. 568 569 CPUs with h/w unaligned access support: 570 Loongson-2K2000/2K3000 and all of Loongson-3 series processors 571 based on LoongArch. 572 573 CPUs without h/w unaligned access support: 574 Loongson-2K0300/2K0500/2K1000. 575 576 If you want to make sure whether to support unaligned memory access 577 on your hardware, please read the bit 20 (UAL) of CPUCFG1 register. 578 579 This option is enabled by default to make the kernel be able to run 580 on all LoongArch systems. But you can disable it manually if you want 581 to run kernel only on systems with h/w unaligned access support in 582 order to optimise for performance. 583 584config CPU_HAS_FPU 585 bool 586 default y 587 588config CPU_HAS_LSX 589 bool "Support for the Loongson SIMD Extension" 590 depends on AS_HAS_LSX_EXTENSION 591 help 592 Loongson SIMD Extension (LSX) introduces 128 bit wide vector registers 593 and a set of SIMD instructions to operate on them. When this option 594 is enabled the kernel will support allocating & switching LSX 595 vector register contexts. If you know that your kernel will only be 596 running on CPUs which do not support LSX 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_LASX 603 bool "Support for the Loongson Advanced SIMD Extension" 604 depends on CPU_HAS_LSX 605 depends on AS_HAS_LASX_EXTENSION 606 help 607 Loongson Advanced SIMD Extension (LASX) introduces 256 bit wide vector 608 registers and a set of SIMD instructions to operate on them. When this 609 option is enabled the kernel will support allocating & switching LASX 610 vector register contexts. If you know that your kernel will only be 611 running on CPUs which do not support LASX or that your userland will 612 not be making use of it then you may wish to say N here to reduce 613 the size & complexity of your kernel. 614 615 If unsure, say Y. 616 617config CPU_HAS_LBT 618 bool "Support for the Loongson Binary Translation Extension" 619 depends on AS_HAS_LBT_EXTENSION 620 help 621 Loongson Binary Translation (LBT) introduces 4 scratch registers (SCR0 622 to SCR3), x86/ARM eflags (eflags) and x87 fpu stack pointer (ftop). 623 Enabling this option allows the kernel to allocate and switch registers 624 specific to LBT. 625 626 If you want to use this feature, such as the Loongson Architecture 627 Translator (LAT), say Y. 628 629config CPU_HAS_PREFETCH 630 bool 631 default y 632 633config ARCH_SUPPORTS_KEXEC 634 def_bool y 635 636config ARCH_SUPPORTS_CRASH_DUMP 637 def_bool y 638 639config ARCH_DEFAULT_CRASH_DUMP 640 def_bool y 641 642config ARCH_SELECTS_CRASH_DUMP 643 def_bool y 644 depends on CRASH_DUMP 645 select RELOCATABLE 646 647config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION 648 def_bool CRASH_RESERVE 649 650config RELOCATABLE 651 bool "Relocatable kernel" 652 select ARCH_HAS_RELR 653 help 654 This builds the kernel as a Position Independent Executable (PIE), 655 which retains all relocation metadata required, so as to relocate 656 the kernel binary at runtime to a different virtual address from 657 its link address. 658 659config RANDOMIZE_BASE 660 bool "Randomize the address of the kernel (KASLR)" 661 depends on RELOCATABLE 662 help 663 Randomizes the physical and virtual address at which the 664 kernel image is loaded, as a security feature that 665 deters exploit attempts relying on knowledge of the location 666 of kernel internals. 667 668 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET. 669 670 If unsure, say N. 671 672config RANDOMIZE_BASE_MAX_OFFSET 673 hex "Maximum KASLR offset" if EXPERT 674 depends on RANDOMIZE_BASE 675 range 0x0 0x10000000 676 default "0x01000000" 677 help 678 When KASLR is active, this provides the maximum offset that will 679 be applied to the kernel image. It should be set according to the 680 amount of physical RAM available in the target system. 681 682 This is limited by the size of the lower address memory, 256MB. 683 684source "kernel/livepatch/Kconfig" 685 686config PARAVIRT 687 bool "Enable paravirtualization code" 688 depends on AS_HAS_LVZ_EXTENSION 689 help 690 This changes the kernel so it can modify itself when it is run 691 under a hypervisor, potentially improving performance significantly 692 over full virtualization. However, when run without a hypervisor 693 the kernel is theoretically slower and slightly larger. 694 695config PARAVIRT_TIME_ACCOUNTING 696 bool "Paravirtual steal time accounting" 697 depends on PARAVIRT 698 help 699 Select this option to enable fine granularity task steal time 700 accounting. Time spent executing other tasks in parallel with 701 the current vCPU is discounted from the vCPU power. To account for 702 that, there can be a small performance impact. 703 704 If in doubt, say N here. 705 706endmenu 707 708config ARCH_SELECT_MEMORY_MODEL 709 def_bool y 710 711config ARCH_FLATMEM_ENABLE 712 def_bool y 713 depends on !NUMA 714 715config ARCH_SPARSEMEM_ENABLE 716 def_bool y 717 select SPARSEMEM_VMEMMAP_ENABLE 718 help 719 Say Y to support efficient handling of sparse physical memory, 720 for architectures which are either NUMA (Non-Uniform Memory Access) 721 or have huge holes in the physical address space for other reasons. 722 See <file:Documentation/mm/numa.rst> for more. 723 724config ARCH_MEMORY_PROBE 725 def_bool y 726 depends on MEMORY_HOTPLUG 727 728config MMU 729 bool 730 default y 731 732config ARCH_MMAP_RND_BITS_MIN 733 default 12 734 735config ARCH_MMAP_RND_BITS_MAX 736 default 18 737 738config ARCH_SUPPORTS_UPROBES 739 def_bool y 740 741config KASAN_SHADOW_OFFSET 742 hex 743 default 0x0 744 depends on KASAN 745 746menu "Power management options" 747 748config ARCH_SUSPEND_POSSIBLE 749 def_bool y 750 751config ARCH_HIBERNATION_POSSIBLE 752 def_bool y 753 754source "kernel/power/Kconfig" 755source "drivers/acpi/Kconfig" 756source "drivers/cpufreq/Kconfig" 757 758endmenu 759 760source "arch/loongarch/kvm/Kconfig" 761