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_FAST_MULTIPLIER 20 select ARCH_HAS_FORTIFY_SOURCE 21 select ARCH_HAS_KCOV 22 select ARCH_HAS_KERNEL_FPU_SUPPORT if CPU_HAS_FPU 23 select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS 24 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE 25 select ARCH_HAS_PTE_SPECIAL 26 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 27 select ARCH_INLINE_READ_LOCK if !PREEMPTION 28 select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION 29 select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION 30 select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION 31 select ARCH_INLINE_READ_UNLOCK if !PREEMPTION 32 select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION 33 select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION 34 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION 35 select ARCH_INLINE_WRITE_LOCK if !PREEMPTION 36 select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION 37 select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION 38 select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION 39 select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION 40 select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION 41 select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION 42 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION 43 select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION 44 select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION 45 select ARCH_INLINE_SPIN_LOCK if !PREEMPTION 46 select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION 47 select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION 48 select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION 49 select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION 50 select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION 51 select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION 52 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION 53 select ARCH_KEEP_MEMBLOCK 54 select ARCH_MIGHT_HAVE_PC_PARPORT 55 select ARCH_MIGHT_HAVE_PC_SERIO 56 select ARCH_SPARSEMEM_ENABLE 57 select ARCH_STACKWALK 58 select ARCH_SUPPORTS_ACPI 59 select ARCH_SUPPORTS_ATOMIC_RMW 60 select ARCH_SUPPORTS_HUGETLBFS 61 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 62 select ARCH_SUPPORTS_LTO_CLANG 63 select ARCH_SUPPORTS_LTO_CLANG_THIN 64 select ARCH_SUPPORTS_NUMA_BALANCING 65 select ARCH_USE_BUILTIN_BSWAP 66 select ARCH_USE_CMPXCHG_LOCKREF 67 select ARCH_USE_QUEUED_RWLOCKS 68 select ARCH_USE_QUEUED_SPINLOCKS 69 select ARCH_WANT_DEFAULT_BPF_JIT 70 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT 71 select ARCH_WANT_LD_ORPHAN_WARN 72 select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP 73 select ARCH_WANTS_NO_INSTR 74 select ARCH_WANTS_THP_SWAP if HAVE_ARCH_TRANSPARENT_HUGEPAGE 75 select BUILDTIME_TABLE_SORT 76 select COMMON_CLK 77 select CPU_PM 78 select EFI 79 select GENERIC_CLOCKEVENTS 80 select GENERIC_CMOS_UPDATE 81 select GENERIC_CPU_AUTOPROBE 82 select GENERIC_CPU_DEVICES 83 select GENERIC_ENTRY 84 select GENERIC_GETTIMEOFDAY 85 select GENERIC_IOREMAP if !ARCH_IOREMAP 86 select GENERIC_IRQ_MULTI_HANDLER 87 select GENERIC_IRQ_PROBE 88 select GENERIC_IRQ_SHOW 89 select GENERIC_LIB_ASHLDI3 90 select GENERIC_LIB_ASHRDI3 91 select GENERIC_LIB_CMPDI2 92 select GENERIC_LIB_LSHRDI3 93 select GENERIC_LIB_UCMPDI2 94 select GENERIC_LIB_DEVMEM_IS_ALLOWED 95 select GENERIC_PCI_IOMAP 96 select GENERIC_SCHED_CLOCK 97 select GENERIC_SMP_IDLE_THREAD 98 select GENERIC_TIME_VSYSCALL 99 select GENERIC_VDSO_TIME_NS 100 select GPIOLIB 101 select HAS_IOPORT 102 select HAVE_ARCH_AUDITSYSCALL 103 select HAVE_ARCH_JUMP_LABEL 104 select HAVE_ARCH_JUMP_LABEL_RELATIVE 105 select HAVE_ARCH_KASAN 106 select HAVE_ARCH_KFENCE 107 select HAVE_ARCH_KGDB if PERF_EVENTS 108 select HAVE_ARCH_MMAP_RND_BITS if MMU 109 select HAVE_ARCH_SECCOMP 110 select HAVE_ARCH_SECCOMP_FILTER 111 select HAVE_ARCH_TRACEHOOK 112 select HAVE_ARCH_TRANSPARENT_HUGEPAGE 113 select HAVE_ARCH_USERFAULTFD_MINOR if USERFAULTFD 114 select HAVE_ASM_MODVERSIONS 115 select HAVE_CONTEXT_TRACKING_USER 116 select HAVE_C_RECORDMCOUNT 117 select HAVE_DEBUG_KMEMLEAK 118 select HAVE_DEBUG_STACKOVERFLOW 119 select HAVE_DMA_CONTIGUOUS 120 select HAVE_DYNAMIC_FTRACE 121 select HAVE_DYNAMIC_FTRACE_WITH_ARGS 122 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS 123 select HAVE_DYNAMIC_FTRACE_WITH_REGS 124 select HAVE_EBPF_JIT 125 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !ARCH_STRICT_ALIGN 126 select HAVE_EXIT_THREAD 127 select HAVE_GUP_FAST 128 select HAVE_FTRACE_MCOUNT_RECORD 129 select HAVE_FUNCTION_ARG_ACCESS_API 130 select HAVE_FUNCTION_ERROR_INJECTION 131 select HAVE_FUNCTION_GRAPH_RETVAL if HAVE_FUNCTION_GRAPH_TRACER 132 select HAVE_FUNCTION_GRAPH_TRACER 133 select HAVE_FUNCTION_TRACER 134 select HAVE_GCC_PLUGINS 135 select HAVE_GENERIC_VDSO 136 select HAVE_HW_BREAKPOINT if PERF_EVENTS 137 select HAVE_IOREMAP_PROT 138 select HAVE_IRQ_EXIT_ON_IRQ_STACK 139 select HAVE_IRQ_TIME_ACCOUNTING 140 select HAVE_KPROBES 141 select HAVE_KPROBES_ON_FTRACE 142 select HAVE_KRETPROBES 143 select HAVE_LIVEPATCH 144 select HAVE_MOD_ARCH_SPECIFIC 145 select HAVE_NMI 146 select HAVE_OBJTOOL if AS_HAS_EXPLICIT_RELOCS 147 select HAVE_PCI 148 select HAVE_PERF_EVENTS 149 select HAVE_PERF_REGS 150 select HAVE_PERF_USER_STACK_DUMP 151 select HAVE_PREEMPT_DYNAMIC_KEY 152 select HAVE_REGS_AND_STACK_ACCESS_API 153 select HAVE_RELIABLE_STACKTRACE if UNWINDER_ORC 154 select HAVE_RETHOOK 155 select HAVE_RSEQ 156 select HAVE_RUST 157 select HAVE_SAMPLE_FTRACE_DIRECT 158 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI 159 select HAVE_SETUP_PER_CPU_AREA if NUMA 160 select HAVE_STACK_VALIDATION if HAVE_OBJTOOL 161 select HAVE_STACKPROTECTOR 162 select HAVE_SYSCALL_TRACEPOINTS 163 select HAVE_TIF_NOHZ 164 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP 165 select IRQ_FORCED_THREADING 166 select IRQ_LOONGARCH_CPU 167 select LOCK_MM_AND_FIND_VMA 168 select MMU_GATHER_MERGE_VMAS if MMU 169 select MODULES_USE_ELF_RELA if MODULES 170 select NEED_PER_CPU_EMBED_FIRST_CHUNK 171 select NEED_PER_CPU_PAGE_FIRST_CHUNK 172 select OF 173 select OF_EARLY_FLATTREE 174 select PCI 175 select PCI_DOMAINS_GENERIC 176 select PCI_ECAM if ACPI 177 select PCI_LOONGSON 178 select PCI_MSI_ARCH_FALLBACKS 179 select PCI_QUIRKS 180 select PERF_USE_VMALLOC 181 select RTC_LIB 182 select SPARSE_IRQ 183 select SYSCTL_ARCH_UNALIGN_ALLOW 184 select SYSCTL_ARCH_UNALIGN_NO_WARN 185 select SYSCTL_EXCEPTION_TRACE 186 select SWIOTLB 187 select TRACE_IRQFLAGS_SUPPORT 188 select USE_PERCPU_NUMA_NODE_ID 189 select USER_STACKTRACE_SUPPORT 190 select ZONE_DMA32 191 192config 32BIT 193 bool 194 195config 64BIT 196 def_bool y 197 198config GENERIC_BUG 199 def_bool y 200 depends on BUG 201 202config GENERIC_BUG_RELATIVE_POINTERS 203 def_bool y 204 depends on GENERIC_BUG 205 206config GENERIC_CALIBRATE_DELAY 207 def_bool y 208 209config GENERIC_CSUM 210 def_bool y 211 212config GENERIC_HWEIGHT 213 def_bool y 214 215config L1_CACHE_SHIFT 216 int 217 default "6" 218 219config LOCKDEP_SUPPORT 220 bool 221 default y 222 223config STACKTRACE_SUPPORT 224 bool 225 default y 226 227# MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the 228# MIPS Loongson code, to preserve Loongson-specific code paths in drivers that 229# are shared between architectures, and specifically expecting the symbols. 230config MACH_LOONGSON32 231 def_bool 32BIT 232 233config MACH_LOONGSON64 234 def_bool 64BIT 235 236config FIX_EARLYCON_MEM 237 def_bool y 238 239config PGTABLE_2LEVEL 240 bool 241 242config PGTABLE_3LEVEL 243 bool 244 245config PGTABLE_4LEVEL 246 bool 247 248config PGTABLE_LEVELS 249 int 250 default 2 if PGTABLE_2LEVEL 251 default 3 if PGTABLE_3LEVEL 252 default 4 if PGTABLE_4LEVEL 253 254config SCHED_OMIT_FRAME_POINTER 255 bool 256 default y 257 258config AS_HAS_EXPLICIT_RELOCS 259 def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x)) 260 261config AS_HAS_FCSR_CLASS 262 def_bool $(as-instr,movfcsr2gr \$t0$(comma)\$fcsr0) 263 264config AS_HAS_LSX_EXTENSION 265 def_bool $(as-instr,vld \$vr0$(comma)\$a0$(comma)0) 266 267config AS_HAS_LASX_EXTENSION 268 def_bool $(as-instr,xvld \$xr0$(comma)\$a0$(comma)0) 269 270config AS_HAS_LBT_EXTENSION 271 def_bool $(as-instr,movscr2gr \$a0$(comma)\$scr0) 272 273config AS_HAS_LVZ_EXTENSION 274 def_bool $(as-instr,hvcl 0) 275 276menu "Kernel type and options" 277 278source "kernel/Kconfig.hz" 279 280choice 281 prompt "Page Table Layout" 282 default 16KB_2LEVEL if 32BIT 283 default 16KB_3LEVEL if 64BIT 284 help 285 Allows choosing the page table layout, which is a combination 286 of page size and page table levels. The size of virtual memory 287 address space are determined by the page table layout. 288 289config 4KB_3LEVEL 290 bool "4KB with 3 levels" 291 select HAVE_PAGE_SIZE_4KB 292 select PGTABLE_3LEVEL 293 help 294 This option selects 4KB page size with 3 level page tables, which 295 support a maximum of 39 bits of application virtual memory. 296 297config 4KB_4LEVEL 298 bool "4KB with 4 levels" 299 select HAVE_PAGE_SIZE_4KB 300 select PGTABLE_4LEVEL 301 help 302 This option selects 4KB page size with 4 level page tables, which 303 support a maximum of 48 bits of application virtual memory. 304 305config 16KB_2LEVEL 306 bool "16KB with 2 levels" 307 select HAVE_PAGE_SIZE_16KB 308 select PGTABLE_2LEVEL 309 help 310 This option selects 16KB page size with 2 level page tables, which 311 support a maximum of 36 bits of application virtual memory. 312 313config 16KB_3LEVEL 314 bool "16KB with 3 levels" 315 select HAVE_PAGE_SIZE_16KB 316 select PGTABLE_3LEVEL 317 help 318 This option selects 16KB page size with 3 level page tables, which 319 support a maximum of 47 bits of application virtual memory. 320 321config 64KB_2LEVEL 322 bool "64KB with 2 levels" 323 select HAVE_PAGE_SIZE_64KB 324 select PGTABLE_2LEVEL 325 help 326 This option selects 64KB page size with 2 level page tables, which 327 support a maximum of 42 bits of application virtual memory. 328 329config 64KB_3LEVEL 330 bool "64KB with 3 levels" 331 select HAVE_PAGE_SIZE_64KB 332 select PGTABLE_3LEVEL 333 help 334 This option selects 64KB page size with 3 level page tables, which 335 support a maximum of 55 bits of application virtual memory. 336 337endchoice 338 339config CMDLINE 340 string "Built-in kernel command line" 341 help 342 For most platforms, the arguments for the kernel's command line 343 are provided at run-time, during boot. However, there are cases 344 where either no arguments are being provided or the provided 345 arguments are insufficient or even invalid. 346 347 When that occurs, it is possible to define a built-in command 348 line here and choose how the kernel should use it later on. 349 350choice 351 prompt "Kernel command line type" 352 default CMDLINE_BOOTLOADER 353 help 354 Choose how the kernel will handle the provided built-in command 355 line. 356 357config CMDLINE_BOOTLOADER 358 bool "Use bootloader kernel arguments if available" 359 help 360 Prefer the command-line passed by the boot loader if available. 361 Use the built-in command line as fallback in case we get nothing 362 during boot. This is the default behaviour. 363 364config CMDLINE_EXTEND 365 bool "Use built-in to extend bootloader kernel arguments" 366 help 367 The command-line arguments provided during boot will be 368 appended to the built-in command line. This is useful in 369 cases where the provided arguments are insufficient and 370 you don't want to or cannot modify them. 371 372config CMDLINE_FORCE 373 bool "Always use the built-in kernel command string" 374 help 375 Always use the built-in command line, even if we get one during 376 boot. This is useful in case you need to override the provided 377 command line on systems where you don't have or want control 378 over it. 379 380endchoice 381 382config BUILTIN_DTB 383 bool "Enable built-in dtb in kernel" 384 depends on OF 385 help 386 Some existing systems do not provide a canonical device tree to 387 the kernel at boot time. Let's provide a device tree table in the 388 kernel, keyed by the dts filename, containing the relevant DTBs. 389 390 Built-in DTBs are generic enough and can be used as references. 391 392config BUILTIN_DTB_NAME 393 string "Source file for built-in dtb" 394 depends on BUILTIN_DTB 395 help 396 Base name (without suffix, relative to arch/loongarch/boot/dts/) 397 for the DTS file that will be used to produce the DTB linked into 398 the kernel. 399 400config DMI 401 bool "Enable DMI scanning" 402 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK 403 default y 404 help 405 This enables SMBIOS/DMI feature for systems, and scanning of 406 DMI to identify machine quirks. 407 408config EFI 409 bool "EFI runtime service support" 410 select UCS2_STRING 411 select EFI_RUNTIME_WRAPPERS 412 help 413 This enables the kernel to use EFI runtime services that are 414 available (such as the EFI variable services). 415 416config EFI_STUB 417 bool "EFI boot stub support" 418 default y 419 depends on EFI 420 select EFI_GENERIC_STUB 421 help 422 This kernel feature allows the kernel to be loaded directly by 423 EFI firmware without the use of a bootloader. 424 425config SCHED_SMT 426 bool "SMT scheduler support" 427 depends on SMP 428 default y 429 help 430 Improves scheduler's performance when there are multiple 431 threads in one physical core. 432 433config SMP 434 bool "Multi-Processing support" 435 help 436 This enables support for systems with more than one CPU. If you have 437 a system with only one CPU, say N. If you have a system with more 438 than one CPU, say Y. 439 440 If you say N here, the kernel will run on uni- and multiprocessor 441 machines, but will use only one CPU of a multiprocessor machine. If 442 you say Y here, the kernel will run on many, but not all, 443 uniprocessor machines. On a uniprocessor machine, the kernel 444 will run faster if you say N here. 445 446 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>. 447 448 If you don't know what to do here, say N. 449 450config HOTPLUG_CPU 451 bool "Support for hot-pluggable CPUs" 452 depends on SMP 453 select GENERIC_IRQ_MIGRATION 454 help 455 Say Y here to allow turning CPUs off and on. CPUs can be 456 controlled through /sys/devices/system/cpu. 457 (Note: power management support will enable this option 458 automatically on SMP systems. ) 459 Say N if you want to disable CPU hotplug. 460 461config NR_CPUS 462 int "Maximum number of CPUs (2-256)" 463 range 2 256 464 depends on SMP 465 default "64" 466 help 467 This allows you to specify the maximum number of CPUs which this 468 kernel will support. 469 470config NUMA 471 bool "NUMA Support" 472 select SMP 473 select ACPI_NUMA if ACPI 474 help 475 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access) 476 support. This option improves performance on systems with more 477 than one NUMA node; on single node systems it is generally better 478 to leave it disabled. 479 480config NODES_SHIFT 481 int 482 default "6" 483 depends on NUMA 484 485config ARCH_FORCE_MAX_ORDER 486 int "Maximum zone order" 487 default "13" if PAGE_SIZE_64KB 488 default "11" if PAGE_SIZE_16KB 489 default "10" 490 help 491 The kernel memory allocator divides physically contiguous memory 492 blocks into "zones", where each zone is a power of two number of 493 pages. This option selects the largest power of two that the kernel 494 keeps in the memory allocator. If you need to allocate very large 495 blocks of physically contiguous memory, then you may need to 496 increase this value. 497 498 The page size is not necessarily 4KB. Keep this in mind 499 when choosing a value for this option. 500 501config ARCH_IOREMAP 502 bool "Enable LoongArch DMW-based ioremap()" 503 help 504 We use generic TLB-based ioremap() by default since it has page 505 protection support. However, you can enable LoongArch DMW-based 506 ioremap() for better performance. 507 508config ARCH_WRITECOMBINE 509 bool "Enable WriteCombine (WUC) for ioremap()" 510 help 511 LoongArch maintains cache coherency in hardware, but when paired 512 with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which 513 is similar to WriteCombine) is out of the scope of cache coherency 514 machanism for PCIe devices (this is a PCIe protocol violation, which 515 may be fixed in newer chipsets). 516 517 This means WUC can only used for write-only memory regions now, so 518 this option is disabled by default, making WUC silently fallback to 519 SUC for ioremap(). You can enable this option if the kernel is ensured 520 to run on hardware without this bug. 521 522 You can override this setting via writecombine=on/off boot parameter. 523 524config ARCH_STRICT_ALIGN 525 bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT 526 default y 527 help 528 Not all LoongArch cores support h/w unaligned access, we can use 529 -mstrict-align build parameter to prevent unaligned accesses. 530 531 CPUs with h/w unaligned access support: 532 Loongson-2K2000/2K3000/3A5000/3C5000/3D5000. 533 534 CPUs without h/w unaligned access support: 535 Loongson-2K500/2K1000. 536 537 This option is enabled by default to make the kernel be able to run 538 on all LoongArch systems. But you can disable it manually if you want 539 to run kernel only on systems with h/w unaligned access support in 540 order to optimise for performance. 541 542config CPU_HAS_FPU 543 bool 544 default y 545 546config CPU_HAS_LSX 547 bool "Support for the Loongson SIMD Extension" 548 depends on AS_HAS_LSX_EXTENSION 549 help 550 Loongson SIMD Extension (LSX) introduces 128 bit wide vector registers 551 and a set of SIMD instructions to operate on them. When this option 552 is enabled the kernel will support allocating & switching LSX 553 vector register contexts. If you know that your kernel will only be 554 running on CPUs which do not support LSX or that your userland will 555 not be making use of it then you may wish to say N here to reduce 556 the size & complexity of your kernel. 557 558 If unsure, say Y. 559 560config CPU_HAS_LASX 561 bool "Support for the Loongson Advanced SIMD Extension" 562 depends on CPU_HAS_LSX 563 depends on AS_HAS_LASX_EXTENSION 564 help 565 Loongson Advanced SIMD Extension (LASX) introduces 256 bit wide vector 566 registers and a set of SIMD instructions to operate on them. When this 567 option is enabled the kernel will support allocating & switching LASX 568 vector register contexts. If you know that your kernel will only be 569 running on CPUs which do not support LASX or that your userland will 570 not be making use of it then you may wish to say N here to reduce 571 the size & complexity of your kernel. 572 573 If unsure, say Y. 574 575config CPU_HAS_LBT 576 bool "Support for the Loongson Binary Translation Extension" 577 depends on AS_HAS_LBT_EXTENSION 578 help 579 Loongson Binary Translation (LBT) introduces 4 scratch registers (SCR0 580 to SCR3), x86/ARM eflags (eflags) and x87 fpu stack pointer (ftop). 581 Enabling this option allows the kernel to allocate and switch registers 582 specific to LBT. 583 584 If you want to use this feature, such as the Loongson Architecture 585 Translator (LAT), say Y. 586 587config CPU_HAS_PREFETCH 588 bool 589 default y 590 591config ARCH_SUPPORTS_KEXEC 592 def_bool y 593 594config ARCH_SUPPORTS_CRASH_DUMP 595 def_bool y 596 597config ARCH_SELECTS_CRASH_DUMP 598 def_bool y 599 depends on CRASH_DUMP 600 select RELOCATABLE 601 602config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION 603 def_bool CRASH_RESERVE 604 605config RELOCATABLE 606 bool "Relocatable kernel" 607 help 608 This builds the kernel as a Position Independent Executable (PIE), 609 which retains all relocation metadata required, so as to relocate 610 the kernel binary at runtime to a different virtual address from 611 its link address. 612 613config RANDOMIZE_BASE 614 bool "Randomize the address of the kernel (KASLR)" 615 depends on RELOCATABLE 616 help 617 Randomizes the physical and virtual address at which the 618 kernel image is loaded, as a security feature that 619 deters exploit attempts relying on knowledge of the location 620 of kernel internals. 621 622 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET. 623 624 If unsure, say N. 625 626config RANDOMIZE_BASE_MAX_OFFSET 627 hex "Maximum KASLR offset" if EXPERT 628 depends on RANDOMIZE_BASE 629 range 0x0 0x10000000 630 default "0x01000000" 631 help 632 When KASLR is active, this provides the maximum offset that will 633 be applied to the kernel image. It should be set according to the 634 amount of physical RAM available in the target system. 635 636 This is limited by the size of the lower address memory, 256MB. 637 638source "kernel/livepatch/Kconfig" 639 640config PARAVIRT 641 bool "Enable paravirtualization code" 642 depends on AS_HAS_LVZ_EXTENSION 643 help 644 This changes the kernel so it can modify itself when it is run 645 under a hypervisor, potentially improving performance significantly 646 over full virtualization. However, when run without a hypervisor 647 the kernel is theoretically slower and slightly larger. 648 649endmenu 650 651config ARCH_SELECT_MEMORY_MODEL 652 def_bool y 653 654config ARCH_FLATMEM_ENABLE 655 def_bool y 656 depends on !NUMA 657 658config ARCH_SPARSEMEM_ENABLE 659 def_bool y 660 select SPARSEMEM_VMEMMAP_ENABLE 661 help 662 Say Y to support efficient handling of sparse physical memory, 663 for architectures which are either NUMA (Non-Uniform Memory Access) 664 or have huge holes in the physical address space for other reasons. 665 See <file:Documentation/mm/numa.rst> for more. 666 667config ARCH_MEMORY_PROBE 668 def_bool y 669 depends on MEMORY_HOTPLUG 670 671config MMU 672 bool 673 default y 674 675config ARCH_MMAP_RND_BITS_MIN 676 default 12 677 678config ARCH_MMAP_RND_BITS_MAX 679 default 18 680 681config ARCH_SUPPORTS_UPROBES 682 def_bool y 683 684config KASAN_SHADOW_OFFSET 685 hex 686 default 0x0 687 depends on KASAN 688 689menu "Power management options" 690 691config ARCH_SUSPEND_POSSIBLE 692 def_bool y 693 694config ARCH_HIBERNATION_POSSIBLE 695 def_bool y 696 697source "kernel/power/Kconfig" 698source "drivers/acpi/Kconfig" 699 700endmenu 701 702source "arch/loongarch/kvm/Kconfig" 703