1 # SPDX-License-Identifier: GPL-2.0
6 select ACPI_GENERIC_GSI if ACPI
7 select ACPI_MCFG if ACPI
8 select ACPI_PPTT if ACPI
9 select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
10 select ARCH_BINFMT_ELF_STATE
11 select ARCH_DISABLE_KASAN_INLINE
12 select ARCH_ENABLE_MEMORY_HOTPLUG
13 select ARCH_ENABLE_MEMORY_HOTREMOVE
14 select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
15 select ARCH_HAS_CPU_FINALIZE_INIT
16 select ARCH_HAS_FORTIFY_SOURCE
18 select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
19 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
20 select ARCH_HAS_PTE_SPECIAL
21 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
22 select ARCH_INLINE_READ_LOCK if !PREEMPTION
23 select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION
24 select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION
25 select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION
26 select ARCH_INLINE_READ_UNLOCK if !PREEMPTION
27 select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION
28 select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION
29 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION
30 select ARCH_INLINE_WRITE_LOCK if !PREEMPTION
31 select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION
32 select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION
33 select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION
34 select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION
35 select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION
36 select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION
37 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION
38 select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION
39 select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION
40 select ARCH_INLINE_SPIN_LOCK if !PREEMPTION
41 select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION
42 select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION
43 select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION
44 select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION
45 select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION
46 select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION
47 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION
48 select ARCH_KEEP_MEMBLOCK
49 select ARCH_MIGHT_HAVE_PC_PARPORT
50 select ARCH_MIGHT_HAVE_PC_SERIO
51 select ARCH_SPARSEMEM_ENABLE
53 select ARCH_SUPPORTS_ACPI
54 select ARCH_SUPPORTS_ATOMIC_RMW
55 select ARCH_SUPPORTS_HUGETLBFS
56 select ARCH_SUPPORTS_LTO_CLANG
57 select ARCH_SUPPORTS_LTO_CLANG_THIN
58 select ARCH_SUPPORTS_NUMA_BALANCING
59 select ARCH_USE_BUILTIN_BSWAP
60 select ARCH_USE_CMPXCHG_LOCKREF
61 select ARCH_USE_QUEUED_RWLOCKS
62 select ARCH_USE_QUEUED_SPINLOCKS
63 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
64 select ARCH_WANT_LD_ORPHAN_WARN
65 select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
66 select ARCH_WANTS_NO_INSTR
67 select BUILDTIME_TABLE_SORT
71 select GENERIC_CLOCKEVENTS
72 select GENERIC_CMOS_UPDATE
73 select GENERIC_CPU_AUTOPROBE
75 select GENERIC_GETTIMEOFDAY
76 select GENERIC_IOREMAP if !ARCH_IOREMAP
77 select GENERIC_IRQ_MULTI_HANDLER
78 select GENERIC_IRQ_PROBE
79 select GENERIC_IRQ_SHOW
80 select GENERIC_LIB_ASHLDI3
81 select GENERIC_LIB_ASHRDI3
82 select GENERIC_LIB_CMPDI2
83 select GENERIC_LIB_LSHRDI3
84 select GENERIC_LIB_UCMPDI2
85 select GENERIC_LIB_DEVMEM_IS_ALLOWED
86 select GENERIC_PCI_IOMAP
87 select GENERIC_SCHED_CLOCK
88 select GENERIC_SMP_IDLE_THREAD
89 select GENERIC_TIME_VSYSCALL
90 select GENERIC_VDSO_TIME_NS
93 select HAVE_ARCH_AUDITSYSCALL
94 select HAVE_ARCH_JUMP_LABEL
95 select HAVE_ARCH_JUMP_LABEL_RELATIVE
96 select HAVE_ARCH_KASAN
97 select HAVE_ARCH_KFENCE
98 select HAVE_ARCH_KGDB if PERF_EVENTS
99 select HAVE_ARCH_MMAP_RND_BITS if MMU
100 select HAVE_ARCH_SECCOMP_FILTER
101 select HAVE_ARCH_TRACEHOOK
102 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
103 select HAVE_ASM_MODVERSIONS
104 select HAVE_CONTEXT_TRACKING_USER
105 select HAVE_C_RECORDMCOUNT
106 select HAVE_DEBUG_KMEMLEAK
107 select HAVE_DEBUG_STACKOVERFLOW
108 select HAVE_DMA_CONTIGUOUS
109 select HAVE_DYNAMIC_FTRACE
110 select HAVE_DYNAMIC_FTRACE_WITH_ARGS
111 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
112 select HAVE_DYNAMIC_FTRACE_WITH_REGS
114 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !ARCH_STRICT_ALIGN
115 select HAVE_EXIT_THREAD
117 select HAVE_FTRACE_MCOUNT_RECORD
118 select HAVE_FUNCTION_ARG_ACCESS_API
119 select HAVE_FUNCTION_ERROR_INJECTION
120 select HAVE_FUNCTION_GRAPH_RETVAL if HAVE_FUNCTION_GRAPH_TRACER
121 select HAVE_FUNCTION_GRAPH_TRACER
122 select HAVE_FUNCTION_TRACER
123 select HAVE_GCC_PLUGINS
124 select HAVE_GENERIC_VDSO
125 select HAVE_HW_BREAKPOINT if PERF_EVENTS
126 select HAVE_IOREMAP_PROT
127 select HAVE_IRQ_EXIT_ON_IRQ_STACK
128 select HAVE_IRQ_TIME_ACCOUNTING
130 select HAVE_KPROBES_ON_FTRACE
131 select HAVE_KRETPROBES
133 select HAVE_MOD_ARCH_SPECIFIC
136 select HAVE_PERF_EVENTS
137 select HAVE_PERF_REGS
138 select HAVE_PERF_USER_STACK_DUMP
139 select HAVE_PREEMPT_DYNAMIC_KEY
140 select HAVE_REGS_AND_STACK_ACCESS_API
143 select HAVE_SAMPLE_FTRACE_DIRECT
144 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
145 select HAVE_SETUP_PER_CPU_AREA if NUMA
146 select HAVE_STACKPROTECTOR
147 select HAVE_SYSCALL_TRACEPOINTS
149 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP
150 select IRQ_FORCED_THREADING
151 select IRQ_LOONGARCH_CPU
152 select LOCK_MM_AND_FIND_VMA
153 select MMU_GATHER_MERGE_VMAS if MMU
154 select MODULES_USE_ELF_RELA if MODULES
155 select NEED_PER_CPU_EMBED_FIRST_CHUNK
156 select NEED_PER_CPU_PAGE_FIRST_CHUNK
158 select OF_EARLY_FLATTREE
160 select PCI_DOMAINS_GENERIC
161 select PCI_ECAM if ACPI
163 select PCI_MSI_ARCH_FALLBACKS
165 select PERF_USE_VMALLOC
169 select SYSCTL_ARCH_UNALIGN_ALLOW
170 select SYSCTL_ARCH_UNALIGN_NO_WARN
171 select SYSCTL_EXCEPTION_TRACE
173 select TRACE_IRQFLAGS_SUPPORT
174 select USE_PERCPU_NUMA_NODE_ID
175 select USER_STACKTRACE_SUPPORT
188 config GENERIC_BUG_RELATIVE_POINTERS
190 depends on GENERIC_BUG
192 config GENERIC_CALIBRATE_DELAY
198 config GENERIC_HWEIGHT
201 config L1_CACHE_SHIFT
205 config LOCKDEP_SUPPORT
209 config STACKTRACE_SUPPORT
213 # MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the
214 # MIPS Loongson code, to preserve Loongson-specific code paths in drivers that
215 # are shared between architectures, and specifically expecting the symbols.
216 config MACH_LOONGSON32
219 config MACH_LOONGSON64
222 config FIX_EARLYCON_MEM
228 config PAGE_SIZE_16KB
231 config PAGE_SIZE_64KB
234 config PGTABLE_2LEVEL
237 config PGTABLE_3LEVEL
240 config PGTABLE_4LEVEL
243 config PGTABLE_LEVELS
245 default 2 if PGTABLE_2LEVEL
246 default 3 if PGTABLE_3LEVEL
247 default 4 if PGTABLE_4LEVEL
249 config SCHED_OMIT_FRAME_POINTER
253 config AS_HAS_EXPLICIT_RELOCS
254 def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x))
256 config AS_HAS_FCSR_CLASS
257 def_bool $(as-instr,movfcsr2gr \$t0$(comma)\$fcsr0)
259 config AS_HAS_LSX_EXTENSION
260 def_bool $(as-instr,vld \$vr0$(comma)\$a0$(comma)0)
262 config AS_HAS_LASX_EXTENSION
263 def_bool $(as-instr,xvld \$xr0$(comma)\$a0$(comma)0)
265 config AS_HAS_LBT_EXTENSION
266 def_bool $(as-instr,movscr2gr \$a0$(comma)\$scr0)
268 config AS_HAS_LVZ_EXTENSION
269 def_bool $(as-instr,hvcl 0)
271 menu "Kernel type and options"
273 source "kernel/Kconfig.hz"
276 prompt "Page Table Layout"
277 default 16KB_2LEVEL if 32BIT
278 default 16KB_3LEVEL if 64BIT
280 Allows choosing the page table layout, which is a combination
281 of page size and page table levels. The size of virtual memory
282 address space are determined by the page table layout.
285 bool "4KB with 3 levels"
287 select PGTABLE_3LEVEL
289 This option selects 4KB page size with 3 level page tables, which
290 support a maximum of 39 bits of application virtual memory.
293 bool "4KB with 4 levels"
295 select PGTABLE_4LEVEL
297 This option selects 4KB page size with 4 level page tables, which
298 support a maximum of 48 bits of application virtual memory.
301 bool "16KB with 2 levels"
302 select PAGE_SIZE_16KB
303 select PGTABLE_2LEVEL
305 This option selects 16KB page size with 2 level page tables, which
306 support a maximum of 36 bits of application virtual memory.
309 bool "16KB with 3 levels"
310 select PAGE_SIZE_16KB
311 select PGTABLE_3LEVEL
313 This option selects 16KB page size with 3 level page tables, which
314 support a maximum of 47 bits of application virtual memory.
317 bool "64KB with 2 levels"
318 select PAGE_SIZE_64KB
319 select PGTABLE_2LEVEL
321 This option selects 64KB page size with 2 level page tables, which
322 support a maximum of 42 bits of application virtual memory.
325 bool "64KB with 3 levels"
326 select PAGE_SIZE_64KB
327 select PGTABLE_3LEVEL
329 This option selects 64KB page size with 3 level page tables, which
330 support a maximum of 55 bits of application virtual memory.
335 string "Built-in kernel command line"
337 For most platforms, the arguments for the kernel's command line
338 are provided at run-time, during boot. However, there are cases
339 where either no arguments are being provided or the provided
340 arguments are insufficient or even invalid.
342 When that occurs, it is possible to define a built-in command
343 line here and choose how the kernel should use it later on.
346 prompt "Kernel command line type"
347 default CMDLINE_BOOTLOADER
349 Choose how the kernel will handle the provided built-in command
352 config CMDLINE_BOOTLOADER
353 bool "Use bootloader kernel arguments if available"
355 Prefer the command-line passed by the boot loader if available.
356 Use the built-in command line as fallback in case we get nothing
357 during boot. This is the default behaviour.
359 config CMDLINE_EXTEND
360 bool "Use built-in to extend bootloader kernel arguments"
362 The command-line arguments provided during boot will be
363 appended to the built-in command line. This is useful in
364 cases where the provided arguments are insufficient and
365 you don't want to or cannot modify them.
368 bool "Always use the built-in kernel command string"
370 Always use the built-in command line, even if we get one during
371 boot. This is useful in case you need to override the provided
372 command line on systems where you don't have or want control
378 bool "Enable DMI scanning"
379 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
382 This enables SMBIOS/DMI feature for systems, and scanning of
383 DMI to identify machine quirks.
386 bool "EFI runtime service support"
388 select EFI_RUNTIME_WRAPPERS
390 This enables the kernel to use EFI runtime services that are
391 available (such as the EFI variable services).
394 bool "EFI boot stub support"
397 select EFI_GENERIC_STUB
399 This kernel feature allows the kernel to be loaded directly by
400 EFI firmware without the use of a bootloader.
403 bool "SMT scheduler support"
406 Improves scheduler's performance when there are multiple
407 threads in one physical core.
410 bool "Multi-Processing support"
412 This enables support for systems with more than one CPU. If you have
413 a system with only one CPU, say N. If you have a system with more
416 If you say N here, the kernel will run on uni- and multiprocessor
417 machines, but will use only one CPU of a multiprocessor machine. If
418 you say Y here, the kernel will run on many, but not all,
419 uniprocessor machines. On a uniprocessor machine, the kernel
420 will run faster if you say N here.
422 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>.
424 If you don't know what to do here, say N.
427 bool "Support for hot-pluggable CPUs"
429 select GENERIC_IRQ_MIGRATION
431 Say Y here to allow turning CPUs off and on. CPUs can be
432 controlled through /sys/devices/system/cpu.
433 (Note: power management support will enable this option
434 automatically on SMP systems. )
435 Say N if you want to disable CPU hotplug.
438 int "Maximum number of CPUs (2-256)"
443 This allows you to specify the maximum number of CPUs which this
449 select ACPI_NUMA if ACPI
451 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access)
452 support. This option improves performance on systems with more
453 than one NUMA node; on single node systems it is generally better
454 to leave it disabled.
461 config ARCH_FORCE_MAX_ORDER
462 int "Maximum zone order"
463 default "13" if PAGE_SIZE_64KB
464 default "11" if PAGE_SIZE_16KB
467 The kernel memory allocator divides physically contiguous memory
468 blocks into "zones", where each zone is a power of two number of
469 pages. This option selects the largest power of two that the kernel
470 keeps in the memory allocator. If you need to allocate very large
471 blocks of physically contiguous memory, then you may need to
474 The page size is not necessarily 4KB. Keep this in mind
475 when choosing a value for this option.
478 bool "Enable LoongArch DMW-based ioremap()"
480 We use generic TLB-based ioremap() by default since it has page
481 protection support. However, you can enable LoongArch DMW-based
482 ioremap() for better performance.
484 config ARCH_WRITECOMBINE
485 bool "Enable WriteCombine (WUC) for ioremap()"
487 LoongArch maintains cache coherency in hardware, but when paired
488 with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which
489 is similar to WriteCombine) is out of the scope of cache coherency
490 machanism for PCIe devices (this is a PCIe protocol violation, which
491 may be fixed in newer chipsets).
493 This means WUC can only used for write-only memory regions now, so
494 this option is disabled by default, making WUC silently fallback to
495 SUC for ioremap(). You can enable this option if the kernel is ensured
496 to run on hardware without this bug.
498 You can override this setting via writecombine=on/off boot parameter.
500 config ARCH_STRICT_ALIGN
501 bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT
504 Not all LoongArch cores support h/w unaligned access, we can use
505 -mstrict-align build parameter to prevent unaligned accesses.
507 CPUs with h/w unaligned access support:
508 Loongson-2K2000/2K3000/3A5000/3C5000/3D5000.
510 CPUs without h/w unaligned access support:
511 Loongson-2K500/2K1000.
513 This option is enabled by default to make the kernel be able to run
514 on all LoongArch systems. But you can disable it manually if you want
515 to run kernel only on systems with h/w unaligned access support in
516 order to optimise for performance.
523 bool "Support for the Loongson SIMD Extension"
524 depends on AS_HAS_LSX_EXTENSION
526 Loongson SIMD Extension (LSX) introduces 128 bit wide vector registers
527 and a set of SIMD instructions to operate on them. When this option
528 is enabled the kernel will support allocating & switching LSX
529 vector register contexts. If you know that your kernel will only be
530 running on CPUs which do not support LSX or that your userland will
531 not be making use of it then you may wish to say N here to reduce
532 the size & complexity of your kernel.
537 bool "Support for the Loongson Advanced SIMD Extension"
538 depends on CPU_HAS_LSX
539 depends on AS_HAS_LASX_EXTENSION
541 Loongson Advanced SIMD Extension (LASX) introduces 256 bit wide vector
542 registers and a set of SIMD instructions to operate on them. When this
543 option is enabled the kernel will support allocating & switching LASX
544 vector register contexts. If you know that your kernel will only be
545 running on CPUs which do not support LASX or that your userland will
546 not be making use of it then you may wish to say N here to reduce
547 the size & complexity of your kernel.
552 bool "Support for the Loongson Binary Translation Extension"
553 depends on AS_HAS_LBT_EXTENSION
555 Loongson Binary Translation (LBT) introduces 4 scratch registers (SCR0
556 to SCR3), x86/ARM eflags (eflags) and x87 fpu stack pointer (ftop).
557 Enabling this option allows the kernel to allocate and switch registers
560 If you want to use this feature, such as the Loongson Architecture
561 Translator (LAT), say Y.
563 config CPU_HAS_PREFETCH
567 config ARCH_SUPPORTS_KEXEC
570 config ARCH_SUPPORTS_CRASH_DUMP
573 config ARCH_SELECTS_CRASH_DUMP
575 depends on CRASH_DUMP
579 bool "Relocatable kernel"
581 This builds the kernel as a Position Independent Executable (PIE),
582 which retains all relocation metadata required, so as to relocate
583 the kernel binary at runtime to a different virtual address from
586 config RANDOMIZE_BASE
587 bool "Randomize the address of the kernel (KASLR)"
588 depends on RELOCATABLE
590 Randomizes the physical and virtual address at which the
591 kernel image is loaded, as a security feature that
592 deters exploit attempts relying on knowledge of the location
595 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET.
599 config RANDOMIZE_BASE_MAX_OFFSET
600 hex "Maximum KASLR offset" if EXPERT
601 depends on RANDOMIZE_BASE
605 When KASLR is active, this provides the maximum offset that will
606 be applied to the kernel image. It should be set according to the
607 amount of physical RAM available in the target system.
609 This is limited by the size of the lower address memory, 256MB.
612 bool "Enable seccomp to safely compute untrusted bytecode"
616 This kernel feature is useful for number crunching applications
617 that may need to compute untrusted bytecode during their
618 execution. By using pipes or other transports made available to
619 the process as file descriptors supporting the read/write
620 syscalls, it's possible to isolate those applications in
621 their own address space using seccomp. Once seccomp is
622 enabled via /proc/<pid>/seccomp, it cannot be disabled
623 and the task is only allowed to execute a few safe syscalls
624 defined by each seccomp mode.
626 If unsure, say Y. Only embedded should say N here.
630 config ARCH_SELECT_MEMORY_MODEL
633 config ARCH_FLATMEM_ENABLE
637 config ARCH_SPARSEMEM_ENABLE
639 select SPARSEMEM_VMEMMAP_ENABLE
641 Say Y to support efficient handling of sparse physical memory,
642 for architectures which are either NUMA (Non-Uniform Memory Access)
643 or have huge holes in the physical address space for other reasons.
644 See <file:Documentation/mm/numa.rst> for more.
646 config ARCH_ENABLE_THP_MIGRATION
648 depends on TRANSPARENT_HUGEPAGE
650 config ARCH_MEMORY_PROBE
652 depends on MEMORY_HOTPLUG
658 config ARCH_MMAP_RND_BITS_MIN
661 config ARCH_MMAP_RND_BITS_MAX
664 config ARCH_SUPPORTS_UPROBES
667 config KASAN_SHADOW_OFFSET
672 menu "Power management options"
674 config ARCH_SUSPEND_POSSIBLE
677 config ARCH_HIBERNATION_POSSIBLE
680 source "kernel/power/Kconfig"
681 source "drivers/acpi/Kconfig"
685 source "arch/loongarch/kvm/Kconfig"