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_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
132 select HAVE_MOD_ARCH_SPECIFIC
135 select HAVE_PERF_EVENTS
136 select HAVE_PERF_REGS
137 select HAVE_PERF_USER_STACK_DUMP
138 select HAVE_REGS_AND_STACK_ACCESS_API
141 select HAVE_SAMPLE_FTRACE_DIRECT
142 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
143 select HAVE_SETUP_PER_CPU_AREA if NUMA
144 select HAVE_STACKPROTECTOR
145 select HAVE_SYSCALL_TRACEPOINTS
147 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP
148 select IRQ_FORCED_THREADING
149 select IRQ_LOONGARCH_CPU
150 select LOCK_MM_AND_FIND_VMA
151 select MMU_GATHER_MERGE_VMAS if MMU
152 select MODULES_USE_ELF_RELA if MODULES
153 select NEED_PER_CPU_EMBED_FIRST_CHUNK
154 select NEED_PER_CPU_PAGE_FIRST_CHUNK
156 select OF_EARLY_FLATTREE
158 select PCI_DOMAINS_GENERIC
159 select PCI_ECAM if ACPI
161 select PCI_MSI_ARCH_FALLBACKS
163 select PERF_USE_VMALLOC
167 select SYSCTL_ARCH_UNALIGN_ALLOW
168 select SYSCTL_ARCH_UNALIGN_NO_WARN
169 select SYSCTL_EXCEPTION_TRACE
171 select TRACE_IRQFLAGS_SUPPORT
172 select USE_PERCPU_NUMA_NODE_ID
173 select USER_STACKTRACE_SUPPORT
186 config GENERIC_BUG_RELATIVE_POINTERS
188 depends on GENERIC_BUG
190 config GENERIC_CALIBRATE_DELAY
196 config GENERIC_HWEIGHT
199 config L1_CACHE_SHIFT
203 config LOCKDEP_SUPPORT
207 config STACKTRACE_SUPPORT
211 # MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the
212 # MIPS Loongson code, to preserve Loongson-specific code paths in drivers that
213 # are shared between architectures, and specifically expecting the symbols.
214 config MACH_LOONGSON32
217 config MACH_LOONGSON64
220 config FIX_EARLYCON_MEM
226 config PAGE_SIZE_16KB
229 config PAGE_SIZE_64KB
232 config PGTABLE_2LEVEL
235 config PGTABLE_3LEVEL
238 config PGTABLE_4LEVEL
241 config PGTABLE_LEVELS
243 default 2 if PGTABLE_2LEVEL
244 default 3 if PGTABLE_3LEVEL
245 default 4 if PGTABLE_4LEVEL
247 config SCHED_OMIT_FRAME_POINTER
251 config AS_HAS_EXPLICIT_RELOCS
252 def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x))
254 config AS_HAS_FCSR_CLASS
255 def_bool $(as-instr,movfcsr2gr \$t0$(comma)\$fcsr0)
257 config AS_HAS_LSX_EXTENSION
258 def_bool $(as-instr,vld \$vr0$(comma)\$a0$(comma)0)
260 config AS_HAS_LASX_EXTENSION
261 def_bool $(as-instr,xvld \$xr0$(comma)\$a0$(comma)0)
263 config AS_HAS_LBT_EXTENSION
264 def_bool $(as-instr,movscr2gr \$a0$(comma)\$scr0)
266 menu "Kernel type and options"
268 source "kernel/Kconfig.hz"
271 prompt "Page Table Layout"
272 default 16KB_2LEVEL if 32BIT
273 default 16KB_3LEVEL if 64BIT
275 Allows choosing the page table layout, which is a combination
276 of page size and page table levels. The size of virtual memory
277 address space are determined by the page table layout.
280 bool "4KB with 3 levels"
282 select PGTABLE_3LEVEL
284 This option selects 4KB page size with 3 level page tables, which
285 support a maximum of 39 bits of application virtual memory.
288 bool "4KB with 4 levels"
290 select PGTABLE_4LEVEL
292 This option selects 4KB page size with 4 level page tables, which
293 support a maximum of 48 bits of application virtual memory.
296 bool "16KB with 2 levels"
297 select PAGE_SIZE_16KB
298 select PGTABLE_2LEVEL
300 This option selects 16KB page size with 2 level page tables, which
301 support a maximum of 36 bits of application virtual memory.
304 bool "16KB with 3 levels"
305 select PAGE_SIZE_16KB
306 select PGTABLE_3LEVEL
308 This option selects 16KB page size with 3 level page tables, which
309 support a maximum of 47 bits of application virtual memory.
312 bool "64KB with 2 levels"
313 select PAGE_SIZE_64KB
314 select PGTABLE_2LEVEL
316 This option selects 64KB page size with 2 level page tables, which
317 support a maximum of 42 bits of application virtual memory.
320 bool "64KB with 3 levels"
321 select PAGE_SIZE_64KB
322 select PGTABLE_3LEVEL
324 This option selects 64KB page size with 3 level page tables, which
325 support a maximum of 55 bits of application virtual memory.
330 string "Built-in kernel command line"
332 For most platforms, the arguments for the kernel's command line
333 are provided at run-time, during boot. However, there are cases
334 where either no arguments are being provided or the provided
335 arguments are insufficient or even invalid.
337 When that occurs, it is possible to define a built-in command
338 line here and choose how the kernel should use it later on.
341 prompt "Kernel command line type"
342 default CMDLINE_BOOTLOADER
344 Choose how the kernel will handle the provided built-in command
347 config CMDLINE_BOOTLOADER
348 bool "Use bootloader kernel arguments if available"
350 Prefer the command-line passed by the boot loader if available.
351 Use the built-in command line as fallback in case we get nothing
352 during boot. This is the default behaviour.
354 config CMDLINE_EXTEND
355 bool "Use built-in to extend bootloader kernel arguments"
357 The command-line arguments provided during boot will be
358 appended to the built-in command line. This is useful in
359 cases where the provided arguments are insufficient and
360 you don't want to or cannot modify them.
363 bool "Always use the built-in kernel command string"
365 Always use the built-in command line, even if we get one during
366 boot. This is useful in case you need to override the provided
367 command line on systems where you don't have or want control
373 bool "Enable DMI scanning"
374 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
377 This enables SMBIOS/DMI feature for systems, and scanning of
378 DMI to identify machine quirks.
381 bool "EFI runtime service support"
383 select EFI_RUNTIME_WRAPPERS
385 This enables the kernel to use EFI runtime services that are
386 available (such as the EFI variable services).
389 bool "EFI boot stub support"
392 select EFI_GENERIC_STUB
394 This kernel feature allows the kernel to be loaded directly by
395 EFI firmware without the use of a bootloader.
398 bool "SMT scheduler support"
401 Improves scheduler's performance when there are multiple
402 threads in one physical core.
405 bool "Multi-Processing support"
407 This enables support for systems with more than one CPU. If you have
408 a system with only one CPU, say N. If you have a system with more
411 If you say N here, the kernel will run on uni- and multiprocessor
412 machines, but will use only one CPU of a multiprocessor machine. If
413 you say Y here, the kernel will run on many, but not all,
414 uniprocessor machines. On a uniprocessor machine, the kernel
415 will run faster if you say N here.
417 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>.
419 If you don't know what to do here, say N.
422 bool "Support for hot-pluggable CPUs"
424 select GENERIC_IRQ_MIGRATION
426 Say Y here to allow turning CPUs off and on. CPUs can be
427 controlled through /sys/devices/system/cpu.
428 (Note: power management support will enable this option
429 automatically on SMP systems. )
430 Say N if you want to disable CPU hotplug.
433 int "Maximum number of CPUs (2-256)"
438 This allows you to specify the maximum number of CPUs which this
444 select ACPI_NUMA if ACPI
446 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access)
447 support. This option improves performance on systems with more
448 than one NUMA node; on single node systems it is generally better
449 to leave it disabled.
456 config ARCH_FORCE_MAX_ORDER
457 int "Maximum zone order"
458 default "13" if PAGE_SIZE_64KB
459 default "11" if PAGE_SIZE_16KB
462 The kernel memory allocator divides physically contiguous memory
463 blocks into "zones", where each zone is a power of two number of
464 pages. This option selects the largest power of two that the kernel
465 keeps in the memory allocator. If you need to allocate very large
466 blocks of physically contiguous memory, then you may need to
469 The page size is not necessarily 4KB. Keep this in mind
470 when choosing a value for this option.
473 bool "Enable LoongArch DMW-based ioremap()"
475 We use generic TLB-based ioremap() by default since it has page
476 protection support. However, you can enable LoongArch DMW-based
477 ioremap() for better performance.
479 config ARCH_WRITECOMBINE
480 bool "Enable WriteCombine (WUC) for ioremap()"
482 LoongArch maintains cache coherency in hardware, but when paired
483 with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which
484 is similar to WriteCombine) is out of the scope of cache coherency
485 machanism for PCIe devices (this is a PCIe protocol violation, which
486 may be fixed in newer chipsets).
488 This means WUC can only used for write-only memory regions now, so
489 this option is disabled by default, making WUC silently fallback to
490 SUC for ioremap(). You can enable this option if the kernel is ensured
491 to run on hardware without this bug.
493 You can override this setting via writecombine=on/off boot parameter.
495 config ARCH_STRICT_ALIGN
496 bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT
499 Not all LoongArch cores support h/w unaligned access, we can use
500 -mstrict-align build parameter to prevent unaligned accesses.
502 CPUs with h/w unaligned access support:
503 Loongson-2K2000/2K3000/3A5000/3C5000/3D5000.
505 CPUs without h/w unaligned access support:
506 Loongson-2K500/2K1000.
508 This option is enabled by default to make the kernel be able to run
509 on all LoongArch systems. But you can disable it manually if you want
510 to run kernel only on systems with h/w unaligned access support in
511 order to optimise for performance.
518 bool "Support for the Loongson SIMD Extension"
519 depends on AS_HAS_LSX_EXTENSION
521 Loongson SIMD Extension (LSX) introduces 128 bit wide vector registers
522 and a set of SIMD instructions to operate on them. When this option
523 is enabled the kernel will support allocating & switching LSX
524 vector register contexts. If you know that your kernel will only be
525 running on CPUs which do not support LSX or that your userland will
526 not be making use of it then you may wish to say N here to reduce
527 the size & complexity of your kernel.
532 bool "Support for the Loongson Advanced SIMD Extension"
533 depends on CPU_HAS_LSX
534 depends on AS_HAS_LASX_EXTENSION
536 Loongson Advanced SIMD Extension (LASX) introduces 256 bit wide vector
537 registers and a set of SIMD instructions to operate on them. When this
538 option is enabled the kernel will support allocating & switching LASX
539 vector register contexts. If you know that your kernel will only be
540 running on CPUs which do not support LASX or that your userland will
541 not be making use of it then you may wish to say N here to reduce
542 the size & complexity of your kernel.
547 bool "Support for the Loongson Binary Translation Extension"
548 depends on AS_HAS_LBT_EXTENSION
550 Loongson Binary Translation (LBT) introduces 4 scratch registers (SCR0
551 to SCR3), x86/ARM eflags (eflags) and x87 fpu stack pointer (ftop).
552 Enabling this option allows the kernel to allocate and switch registers
555 If you want to use this feature, such as the Loongson Architecture
556 Translator (LAT), say Y.
558 config CPU_HAS_PREFETCH
563 bool "Kexec system call"
566 kexec is a system call that implements the ability to shutdown your
567 current kernel, and to start another kernel. It is like a reboot
568 but it is independent of the system firmware. And like a reboot
569 you can start any kernel with it, not just Linux.
571 The name comes from the similarity to the exec system call.
574 bool "Build kdump crash kernel"
577 Generate crash dump after being started by kexec. This should
578 be normally only set in special crash dump kernels which are
579 loaded in the main kernel with kexec-tools into a specially
580 reserved region and then later executed after a crash by
583 For more details see Documentation/admin-guide/kdump/kdump.rst
586 bool "Relocatable kernel"
588 This builds the kernel as a Position Independent Executable (PIE),
589 which retains all relocation metadata required, so as to relocate
590 the kernel binary at runtime to a different virtual address from
593 config RANDOMIZE_BASE
594 bool "Randomize the address of the kernel (KASLR)"
595 depends on RELOCATABLE
597 Randomizes the physical and virtual address at which the
598 kernel image is loaded, as a security feature that
599 deters exploit attempts relying on knowledge of the location
602 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET.
606 config RANDOMIZE_BASE_MAX_OFFSET
607 hex "Maximum KASLR offset" if EXPERT
608 depends on RANDOMIZE_BASE
612 When KASLR is active, this provides the maximum offset that will
613 be applied to the kernel image. It should be set according to the
614 amount of physical RAM available in the target system.
616 This is limited by the size of the lower address memory, 256MB.
619 bool "Enable seccomp to safely compute untrusted bytecode"
623 This kernel feature is useful for number crunching applications
624 that may need to compute untrusted bytecode during their
625 execution. By using pipes or other transports made available to
626 the process as file descriptors supporting the read/write
627 syscalls, it's possible to isolate those applications in
628 their own address space using seccomp. Once seccomp is
629 enabled via /proc/<pid>/seccomp, it cannot be disabled
630 and the task is only allowed to execute a few safe syscalls
631 defined by each seccomp mode.
633 If unsure, say Y. Only embedded should say N here.
637 config ARCH_SELECT_MEMORY_MODEL
640 config ARCH_FLATMEM_ENABLE
644 config ARCH_SPARSEMEM_ENABLE
646 select SPARSEMEM_VMEMMAP_ENABLE
648 Say Y to support efficient handling of sparse physical memory,
649 for architectures which are either NUMA (Non-Uniform Memory Access)
650 or have huge holes in the physical address space for other reasons.
651 See <file:Documentation/mm/numa.rst> for more.
653 config ARCH_ENABLE_THP_MIGRATION
655 depends on TRANSPARENT_HUGEPAGE
657 config ARCH_MEMORY_PROBE
659 depends on MEMORY_HOTPLUG
665 config ARCH_MMAP_RND_BITS_MIN
668 config ARCH_MMAP_RND_BITS_MAX
671 config ARCH_SUPPORTS_UPROBES
674 config KASAN_SHADOW_OFFSET
679 menu "Power management options"
681 config ARCH_SUSPEND_POSSIBLE
684 config ARCH_HIBERNATION_POSSIBLE
687 source "kernel/power/Kconfig"
688 source "drivers/acpi/Kconfig"