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_SYSTEM_POWER_STATES_SUPPORT if ACPI 9 select ARCH_BINFMT_ELF_STATE 10 select ARCH_ENABLE_MEMORY_HOTPLUG 11 select ARCH_ENABLE_MEMORY_HOTREMOVE 12 select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI 13 select ARCH_HAS_CPU_FINALIZE_INIT 14 select ARCH_HAS_FORTIFY_SOURCE 15 select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS 16 select ARCH_HAS_PTE_SPECIAL 17 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 18 select ARCH_INLINE_READ_LOCK if !PREEMPTION 19 select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION 20 select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION 21 select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION 22 select ARCH_INLINE_READ_UNLOCK if !PREEMPTION 23 select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION 24 select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION 25 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION 26 select ARCH_INLINE_WRITE_LOCK if !PREEMPTION 27 select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION 28 select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION 29 select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION 30 select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION 31 select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION 32 select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION 33 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION 34 select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION 35 select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION 36 select ARCH_INLINE_SPIN_LOCK if !PREEMPTION 37 select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION 38 select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION 39 select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION 40 select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION 41 select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION 42 select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION 43 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION 44 select ARCH_KEEP_MEMBLOCK 45 select ARCH_MIGHT_HAVE_PC_PARPORT 46 select ARCH_MIGHT_HAVE_PC_SERIO 47 select ARCH_SPARSEMEM_ENABLE 48 select ARCH_STACKWALK 49 select ARCH_SUPPORTS_ACPI 50 select ARCH_SUPPORTS_ATOMIC_RMW 51 select ARCH_SUPPORTS_HUGETLBFS 52 select ARCH_SUPPORTS_NUMA_BALANCING 53 select ARCH_USE_BUILTIN_BSWAP 54 select ARCH_USE_CMPXCHG_LOCKREF 55 select ARCH_USE_QUEUED_RWLOCKS 56 select ARCH_USE_QUEUED_SPINLOCKS 57 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT 58 select ARCH_WANT_LD_ORPHAN_WARN 59 select ARCH_WANT_OPTIMIZE_VMEMMAP 60 select ARCH_WANTS_NO_INSTR 61 select BUILDTIME_TABLE_SORT 62 select COMMON_CLK 63 select CPU_PM 64 select EFI 65 select GENERIC_CLOCKEVENTS 66 select GENERIC_CMOS_UPDATE 67 select GENERIC_CPU_AUTOPROBE 68 select GENERIC_ENTRY 69 select GENERIC_GETTIMEOFDAY 70 select GENERIC_IOREMAP if !ARCH_IOREMAP 71 select GENERIC_IRQ_MULTI_HANDLER 72 select GENERIC_IRQ_PROBE 73 select GENERIC_IRQ_SHOW 74 select GENERIC_LIB_ASHLDI3 75 select GENERIC_LIB_ASHRDI3 76 select GENERIC_LIB_CMPDI2 77 select GENERIC_LIB_LSHRDI3 78 select GENERIC_LIB_UCMPDI2 79 select GENERIC_LIB_DEVMEM_IS_ALLOWED 80 select GENERIC_PCI_IOMAP 81 select GENERIC_SCHED_CLOCK 82 select GENERIC_SMP_IDLE_THREAD 83 select GENERIC_TIME_VSYSCALL 84 select GPIOLIB 85 select HAS_IOPORT 86 select HAVE_ARCH_AUDITSYSCALL 87 select HAVE_ARCH_MMAP_RND_BITS if MMU 88 select HAVE_ARCH_SECCOMP_FILTER 89 select HAVE_ARCH_TRACEHOOK 90 select HAVE_ARCH_TRANSPARENT_HUGEPAGE 91 select HAVE_ASM_MODVERSIONS 92 select HAVE_CONTEXT_TRACKING_USER 93 select HAVE_C_RECORDMCOUNT 94 select HAVE_DEBUG_STACKOVERFLOW 95 select HAVE_DMA_CONTIGUOUS 96 select HAVE_DYNAMIC_FTRACE 97 select HAVE_DYNAMIC_FTRACE_WITH_ARGS 98 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS 99 select HAVE_DYNAMIC_FTRACE_WITH_REGS 100 select HAVE_EBPF_JIT 101 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !ARCH_STRICT_ALIGN 102 select HAVE_EXIT_THREAD 103 select HAVE_FAST_GUP 104 select HAVE_FTRACE_MCOUNT_RECORD 105 select HAVE_FUNCTION_ARG_ACCESS_API 106 select HAVE_FUNCTION_ERROR_INJECTION 107 select HAVE_FUNCTION_GRAPH_TRACER 108 select HAVE_FUNCTION_TRACER 109 select HAVE_GENERIC_VDSO 110 select HAVE_HW_BREAKPOINT if PERF_EVENTS 111 select HAVE_IOREMAP_PROT 112 select HAVE_IRQ_EXIT_ON_IRQ_STACK 113 select HAVE_IRQ_TIME_ACCOUNTING 114 select HAVE_KPROBES 115 select HAVE_KPROBES_ON_FTRACE 116 select HAVE_KRETPROBES 117 select HAVE_MOD_ARCH_SPECIFIC 118 select HAVE_NMI 119 select HAVE_PCI 120 select HAVE_PERF_EVENTS 121 select HAVE_PERF_REGS 122 select HAVE_PERF_USER_STACK_DUMP 123 select HAVE_REGS_AND_STACK_ACCESS_API 124 select HAVE_RSEQ 125 select HAVE_SAMPLE_FTRACE_DIRECT 126 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI 127 select HAVE_SETUP_PER_CPU_AREA if NUMA 128 select HAVE_STACKPROTECTOR 129 select HAVE_SYSCALL_TRACEPOINTS 130 select HAVE_TIF_NOHZ 131 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP 132 select IRQ_FORCED_THREADING 133 select IRQ_LOONGARCH_CPU 134 select LOCK_MM_AND_FIND_VMA 135 select MMU_GATHER_MERGE_VMAS if MMU 136 select MODULES_USE_ELF_RELA if MODULES 137 select NEED_PER_CPU_EMBED_FIRST_CHUNK 138 select NEED_PER_CPU_PAGE_FIRST_CHUNK 139 select OF 140 select OF_EARLY_FLATTREE 141 select PCI 142 select PCI_DOMAINS_GENERIC 143 select PCI_ECAM if ACPI 144 select PCI_LOONGSON 145 select PCI_MSI_ARCH_FALLBACKS 146 select PCI_QUIRKS 147 select PERF_USE_VMALLOC 148 select RTC_LIB 149 select SMP 150 select SPARSE_IRQ 151 select SYSCTL_ARCH_UNALIGN_ALLOW 152 select SYSCTL_ARCH_UNALIGN_NO_WARN 153 select SYSCTL_EXCEPTION_TRACE 154 select SWIOTLB 155 select TRACE_IRQFLAGS_SUPPORT 156 select USE_PERCPU_NUMA_NODE_ID 157 select USER_STACKTRACE_SUPPORT 158 select ZONE_DMA32 159 160config 32BIT 161 bool 162 163config 64BIT 164 def_bool y 165 166config CPU_HAS_FPU 167 bool 168 default y 169 170config CPU_HAS_PREFETCH 171 bool 172 default y 173 174config GENERIC_BUG 175 def_bool y 176 depends on BUG 177 178config GENERIC_BUG_RELATIVE_POINTERS 179 def_bool y 180 depends on GENERIC_BUG 181 182config GENERIC_CALIBRATE_DELAY 183 def_bool y 184 185config GENERIC_CSUM 186 def_bool y 187 188config GENERIC_HWEIGHT 189 def_bool y 190 191config L1_CACHE_SHIFT 192 int 193 default "6" 194 195config LOCKDEP_SUPPORT 196 bool 197 default y 198 199config STACKTRACE_SUPPORT 200 bool 201 default y 202 203# MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the 204# MIPS Loongson code, to preserve Loongson-specific code paths in drivers that 205# are shared between architectures, and specifically expecting the symbols. 206config MACH_LOONGSON32 207 def_bool 32BIT 208 209config MACH_LOONGSON64 210 def_bool 64BIT 211 212config FIX_EARLYCON_MEM 213 def_bool y 214 215config PAGE_SIZE_4KB 216 bool 217 218config PAGE_SIZE_16KB 219 bool 220 221config PAGE_SIZE_64KB 222 bool 223 224config PGTABLE_2LEVEL 225 bool 226 227config PGTABLE_3LEVEL 228 bool 229 230config PGTABLE_4LEVEL 231 bool 232 233config PGTABLE_LEVELS 234 int 235 default 2 if PGTABLE_2LEVEL 236 default 3 if PGTABLE_3LEVEL 237 default 4 if PGTABLE_4LEVEL 238 239config SCHED_OMIT_FRAME_POINTER 240 bool 241 default y 242 243config AS_HAS_EXPLICIT_RELOCS 244 def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x)) 245 246menu "Kernel type and options" 247 248source "kernel/Kconfig.hz" 249 250choice 251 prompt "Page Table Layout" 252 default 16KB_2LEVEL if 32BIT 253 default 16KB_3LEVEL if 64BIT 254 help 255 Allows choosing the page table layout, which is a combination 256 of page size and page table levels. The size of virtual memory 257 address space are determined by the page table layout. 258 259config 4KB_3LEVEL 260 bool "4KB with 3 levels" 261 select PAGE_SIZE_4KB 262 select PGTABLE_3LEVEL 263 help 264 This option selects 4KB page size with 3 level page tables, which 265 support a maximum of 39 bits of application virtual memory. 266 267config 4KB_4LEVEL 268 bool "4KB with 4 levels" 269 select PAGE_SIZE_4KB 270 select PGTABLE_4LEVEL 271 help 272 This option selects 4KB page size with 4 level page tables, which 273 support a maximum of 48 bits of application virtual memory. 274 275config 16KB_2LEVEL 276 bool "16KB with 2 levels" 277 select PAGE_SIZE_16KB 278 select PGTABLE_2LEVEL 279 help 280 This option selects 16KB page size with 2 level page tables, which 281 support a maximum of 36 bits of application virtual memory. 282 283config 16KB_3LEVEL 284 bool "16KB with 3 levels" 285 select PAGE_SIZE_16KB 286 select PGTABLE_3LEVEL 287 help 288 This option selects 16KB page size with 3 level page tables, which 289 support a maximum of 47 bits of application virtual memory. 290 291config 64KB_2LEVEL 292 bool "64KB with 2 levels" 293 select PAGE_SIZE_64KB 294 select PGTABLE_2LEVEL 295 help 296 This option selects 64KB page size with 2 level page tables, which 297 support a maximum of 42 bits of application virtual memory. 298 299config 64KB_3LEVEL 300 bool "64KB with 3 levels" 301 select PAGE_SIZE_64KB 302 select PGTABLE_3LEVEL 303 help 304 This option selects 64KB page size with 3 level page tables, which 305 support a maximum of 55 bits of application virtual memory. 306 307endchoice 308 309config CMDLINE 310 string "Built-in kernel command line" 311 help 312 For most platforms, the arguments for the kernel's command line 313 are provided at run-time, during boot. However, there are cases 314 where either no arguments are being provided or the provided 315 arguments are insufficient or even invalid. 316 317 When that occurs, it is possible to define a built-in command 318 line here and choose how the kernel should use it later on. 319 320choice 321 prompt "Kernel command line type" 322 default CMDLINE_BOOTLOADER 323 help 324 Choose how the kernel will handle the provided built-in command 325 line. 326 327config CMDLINE_BOOTLOADER 328 bool "Use bootloader kernel arguments if available" 329 help 330 Prefer the command-line passed by the boot loader if available. 331 Use the built-in command line as fallback in case we get nothing 332 during boot. This is the default behaviour. 333 334config CMDLINE_EXTEND 335 bool "Use built-in to extend bootloader kernel arguments" 336 help 337 The command-line arguments provided during boot will be 338 appended to the built-in command line. This is useful in 339 cases where the provided arguments are insufficient and 340 you don't want to or cannot modify them. 341 342config CMDLINE_FORCE 343 bool "Always use the built-in kernel command string" 344 help 345 Always use the built-in command line, even if we get one during 346 boot. This is useful in case you need to override the provided 347 command line on systems where you don't have or want control 348 over it. 349 350endchoice 351 352config DMI 353 bool "Enable DMI scanning" 354 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK 355 default y 356 help 357 This enables SMBIOS/DMI feature for systems, and scanning of 358 DMI to identify machine quirks. 359 360config EFI 361 bool "EFI runtime service support" 362 select UCS2_STRING 363 select EFI_RUNTIME_WRAPPERS 364 help 365 This enables the kernel to use EFI runtime services that are 366 available (such as the EFI variable services). 367 368config EFI_STUB 369 bool "EFI boot stub support" 370 default y 371 depends on EFI 372 select EFI_GENERIC_STUB 373 help 374 This kernel feature allows the kernel to be loaded directly by 375 EFI firmware without the use of a bootloader. 376 377config SMP 378 bool "Multi-Processing support" 379 help 380 This enables support for systems with more than one CPU. If you have 381 a system with only one CPU, say N. If you have a system with more 382 than one CPU, say Y. 383 384 If you say N here, the kernel will run on uni- and multiprocessor 385 machines, but will use only one CPU of a multiprocessor machine. If 386 you say Y here, the kernel will run on many, but not all, 387 uniprocessor machines. On a uniprocessor machine, the kernel 388 will run faster if you say N here. 389 390 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>. 391 392 If you don't know what to do here, say N. 393 394config HOTPLUG_CPU 395 bool "Support for hot-pluggable CPUs" 396 depends on SMP 397 select GENERIC_IRQ_MIGRATION 398 help 399 Say Y here to allow turning CPUs off and on. CPUs can be 400 controlled through /sys/devices/system/cpu. 401 (Note: power management support will enable this option 402 automatically on SMP systems. ) 403 Say N if you want to disable CPU hotplug. 404 405config NR_CPUS 406 int "Maximum number of CPUs (2-256)" 407 range 2 256 408 depends on SMP 409 default "64" 410 help 411 This allows you to specify the maximum number of CPUs which this 412 kernel will support. 413 414config NUMA 415 bool "NUMA Support" 416 select SMP 417 select ACPI_NUMA if ACPI 418 help 419 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access) 420 support. This option improves performance on systems with more 421 than one NUMA node; on single node systems it is generally better 422 to leave it disabled. 423 424config NODES_SHIFT 425 int 426 default "6" 427 depends on NUMA 428 429config ARCH_FORCE_MAX_ORDER 430 int "Maximum zone order" 431 default "13" if PAGE_SIZE_64KB 432 default "11" if PAGE_SIZE_16KB 433 default "10" 434 help 435 The kernel memory allocator divides physically contiguous memory 436 blocks into "zones", where each zone is a power of two number of 437 pages. This option selects the largest power of two that the kernel 438 keeps in the memory allocator. If you need to allocate very large 439 blocks of physically contiguous memory, then you may need to 440 increase this value. 441 442 The page size is not necessarily 4KB. Keep this in mind 443 when choosing a value for this option. 444 445config ARCH_IOREMAP 446 bool "Enable LoongArch DMW-based ioremap()" 447 help 448 We use generic TLB-based ioremap() by default since it has page 449 protection support. However, you can enable LoongArch DMW-based 450 ioremap() for better performance. 451 452config ARCH_WRITECOMBINE 453 bool "Enable WriteCombine (WUC) for ioremap()" 454 help 455 LoongArch maintains cache coherency in hardware, but when paired 456 with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which 457 is similar to WriteCombine) is out of the scope of cache coherency 458 machanism for PCIe devices (this is a PCIe protocol violation, which 459 may be fixed in newer chipsets). 460 461 This means WUC can only used for write-only memory regions now, so 462 this option is disabled by default, making WUC silently fallback to 463 SUC for ioremap(). You can enable this option if the kernel is ensured 464 to run on hardware without this bug. 465 466 You can override this setting via writecombine=on/off boot parameter. 467 468config ARCH_STRICT_ALIGN 469 bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT 470 default y 471 help 472 Not all LoongArch cores support h/w unaligned access, we can use 473 -mstrict-align build parameter to prevent unaligned accesses. 474 475 CPUs with h/w unaligned access support: 476 Loongson-2K2000/2K3000/3A5000/3C5000/3D5000. 477 478 CPUs without h/w unaligned access support: 479 Loongson-2K500/2K1000. 480 481 This option is enabled by default to make the kernel be able to run 482 on all LoongArch systems. But you can disable it manually if you want 483 to run kernel only on systems with h/w unaligned access support in 484 order to optimise for performance. 485 486config KEXEC 487 bool "Kexec system call" 488 select KEXEC_CORE 489 help 490 kexec is a system call that implements the ability to shutdown your 491 current kernel, and to start another kernel. It is like a reboot 492 but it is independent of the system firmware. And like a reboot 493 you can start any kernel with it, not just Linux. 494 495 The name comes from the similarity to the exec system call. 496 497config CRASH_DUMP 498 bool "Build kdump crash kernel" 499 select RELOCATABLE 500 help 501 Generate crash dump after being started by kexec. This should 502 be normally only set in special crash dump kernels which are 503 loaded in the main kernel with kexec-tools into a specially 504 reserved region and then later executed after a crash by 505 kdump/kexec. 506 507 For more details see Documentation/admin-guide/kdump/kdump.rst 508 509config RELOCATABLE 510 bool "Relocatable kernel" 511 help 512 This builds the kernel as a Position Independent Executable (PIE), 513 which retains all relocation metadata required, so as to relocate 514 the kernel binary at runtime to a different virtual address from 515 its link address. 516 517config RANDOMIZE_BASE 518 bool "Randomize the address of the kernel (KASLR)" 519 depends on RELOCATABLE 520 help 521 Randomizes the physical and virtual address at which the 522 kernel image is loaded, as a security feature that 523 deters exploit attempts relying on knowledge of the location 524 of kernel internals. 525 526 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET. 527 528 If unsure, say N. 529 530config RANDOMIZE_BASE_MAX_OFFSET 531 hex "Maximum KASLR offset" if EXPERT 532 depends on RANDOMIZE_BASE 533 range 0x0 0x10000000 534 default "0x01000000" 535 help 536 When KASLR is active, this provides the maximum offset that will 537 be applied to the kernel image. It should be set according to the 538 amount of physical RAM available in the target system. 539 540 This is limited by the size of the lower address memory, 256MB. 541 542config SECCOMP 543 bool "Enable seccomp to safely compute untrusted bytecode" 544 depends on PROC_FS 545 default y 546 help 547 This kernel feature is useful for number crunching applications 548 that may need to compute untrusted bytecode during their 549 execution. By using pipes or other transports made available to 550 the process as file descriptors supporting the read/write 551 syscalls, it's possible to isolate those applications in 552 their own address space using seccomp. Once seccomp is 553 enabled via /proc/<pid>/seccomp, it cannot be disabled 554 and the task is only allowed to execute a few safe syscalls 555 defined by each seccomp mode. 556 557 If unsure, say Y. Only embedded should say N here. 558 559endmenu 560 561config ARCH_SELECT_MEMORY_MODEL 562 def_bool y 563 564config ARCH_FLATMEM_ENABLE 565 def_bool y 566 depends on !NUMA 567 568config ARCH_SPARSEMEM_ENABLE 569 def_bool y 570 select SPARSEMEM_VMEMMAP_ENABLE 571 help 572 Say Y to support efficient handling of sparse physical memory, 573 for architectures which are either NUMA (Non-Uniform Memory Access) 574 or have huge holes in the physical address space for other reasons. 575 See <file:Documentation/mm/numa.rst> for more. 576 577config ARCH_ENABLE_THP_MIGRATION 578 def_bool y 579 depends on TRANSPARENT_HUGEPAGE 580 581config ARCH_MEMORY_PROBE 582 def_bool y 583 depends on MEMORY_HOTPLUG 584 585config MMU 586 bool 587 default y 588 589config ARCH_MMAP_RND_BITS_MIN 590 default 12 591 592config ARCH_MMAP_RND_BITS_MAX 593 default 18 594 595menu "Power management options" 596 597config ARCH_SUSPEND_POSSIBLE 598 def_bool y 599 600config ARCH_HIBERNATION_POSSIBLE 601 def_bool y 602 603source "kernel/power/Kconfig" 604source "drivers/acpi/Kconfig" 605 606endmenu 607 608source "drivers/firmware/Kconfig" 609