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_ENABLE_MEMORY_HOTPLUG
12 select ARCH_ENABLE_MEMORY_HOTREMOVE
13 select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
14 select ARCH_HAS_CPU_FINALIZE_INIT
15 select ARCH_HAS_FORTIFY_SOURCE
16 select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
17 select ARCH_HAS_PTE_SPECIAL
18 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
19 select ARCH_INLINE_READ_LOCK if !PREEMPTION
20 select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION
21 select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION
22 select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION
23 select ARCH_INLINE_READ_UNLOCK if !PREEMPTION
24 select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION
25 select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION
26 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION
27 select ARCH_INLINE_WRITE_LOCK if !PREEMPTION
28 select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION
29 select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION
30 select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION
31 select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION
32 select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION
33 select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION
34 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION
35 select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION
36 select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION
37 select ARCH_INLINE_SPIN_LOCK if !PREEMPTION
38 select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION
39 select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION
40 select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION
41 select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION
42 select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION
43 select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION
44 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION
45 select ARCH_KEEP_MEMBLOCK
46 select ARCH_MIGHT_HAVE_PC_PARPORT
47 select ARCH_MIGHT_HAVE_PC_SERIO
48 select ARCH_SPARSEMEM_ENABLE
50 select ARCH_SUPPORTS_ACPI
51 select ARCH_SUPPORTS_ATOMIC_RMW
52 select ARCH_SUPPORTS_HUGETLBFS
53 select ARCH_SUPPORTS_LTO_CLANG
54 select ARCH_SUPPORTS_LTO_CLANG_THIN
55 select ARCH_SUPPORTS_NUMA_BALANCING
56 select ARCH_USE_BUILTIN_BSWAP
57 select ARCH_USE_CMPXCHG_LOCKREF
58 select ARCH_USE_QUEUED_RWLOCKS
59 select ARCH_USE_QUEUED_SPINLOCKS
60 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
61 select ARCH_WANT_LD_ORPHAN_WARN
62 select ARCH_WANT_OPTIMIZE_VMEMMAP
63 select ARCH_WANTS_NO_INSTR
64 select BUILDTIME_TABLE_SORT
68 select GENERIC_CLOCKEVENTS
69 select GENERIC_CMOS_UPDATE
70 select GENERIC_CPU_AUTOPROBE
72 select GENERIC_GETTIMEOFDAY
73 select GENERIC_IOREMAP if !ARCH_IOREMAP
74 select GENERIC_IRQ_MULTI_HANDLER
75 select GENERIC_IRQ_PROBE
76 select GENERIC_IRQ_SHOW
77 select GENERIC_LIB_ASHLDI3
78 select GENERIC_LIB_ASHRDI3
79 select GENERIC_LIB_CMPDI2
80 select GENERIC_LIB_LSHRDI3
81 select GENERIC_LIB_UCMPDI2
82 select GENERIC_LIB_DEVMEM_IS_ALLOWED
83 select GENERIC_PCI_IOMAP
84 select GENERIC_SCHED_CLOCK
85 select GENERIC_SMP_IDLE_THREAD
86 select GENERIC_TIME_VSYSCALL
87 select GENERIC_VDSO_TIME_NS
90 select HAVE_ARCH_AUDITSYSCALL
91 select HAVE_ARCH_JUMP_LABEL
92 select HAVE_ARCH_JUMP_LABEL_RELATIVE
93 select HAVE_ARCH_MMAP_RND_BITS if MMU
94 select HAVE_ARCH_SECCOMP_FILTER
95 select HAVE_ARCH_TRACEHOOK
96 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
97 select HAVE_ASM_MODVERSIONS
98 select HAVE_CONTEXT_TRACKING_USER
99 select HAVE_C_RECORDMCOUNT
100 select HAVE_DEBUG_KMEMLEAK
101 select HAVE_DEBUG_STACKOVERFLOW
102 select HAVE_DMA_CONTIGUOUS
103 select HAVE_DYNAMIC_FTRACE
104 select HAVE_DYNAMIC_FTRACE_WITH_ARGS
105 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
106 select HAVE_DYNAMIC_FTRACE_WITH_REGS
108 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !ARCH_STRICT_ALIGN
109 select HAVE_EXIT_THREAD
111 select HAVE_FTRACE_MCOUNT_RECORD
112 select HAVE_FUNCTION_ARG_ACCESS_API
113 select HAVE_FUNCTION_ERROR_INJECTION
114 select HAVE_FUNCTION_GRAPH_TRACER
115 select HAVE_FUNCTION_TRACER
116 select HAVE_GENERIC_VDSO
117 select HAVE_HW_BREAKPOINT if PERF_EVENTS
118 select HAVE_IOREMAP_PROT
119 select HAVE_IRQ_EXIT_ON_IRQ_STACK
120 select HAVE_IRQ_TIME_ACCOUNTING
122 select HAVE_KPROBES_ON_FTRACE
123 select HAVE_KRETPROBES
124 select HAVE_MOD_ARCH_SPECIFIC
127 select HAVE_PERF_EVENTS
128 select HAVE_PERF_REGS
129 select HAVE_PERF_USER_STACK_DUMP
130 select HAVE_REGS_AND_STACK_ACCESS_API
133 select HAVE_SAMPLE_FTRACE_DIRECT
134 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
135 select HAVE_SETUP_PER_CPU_AREA if NUMA
136 select HAVE_STACKPROTECTOR
137 select HAVE_SYSCALL_TRACEPOINTS
139 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP
140 select IRQ_FORCED_THREADING
141 select IRQ_LOONGARCH_CPU
142 select LOCK_MM_AND_FIND_VMA
143 select MMU_GATHER_MERGE_VMAS if MMU
144 select MODULES_USE_ELF_RELA if MODULES
145 select NEED_PER_CPU_EMBED_FIRST_CHUNK
146 select NEED_PER_CPU_PAGE_FIRST_CHUNK
148 select OF_EARLY_FLATTREE
150 select PCI_DOMAINS_GENERIC
151 select PCI_ECAM if ACPI
153 select PCI_MSI_ARCH_FALLBACKS
155 select PERF_USE_VMALLOC
159 select SYSCTL_ARCH_UNALIGN_ALLOW
160 select SYSCTL_ARCH_UNALIGN_NO_WARN
161 select SYSCTL_EXCEPTION_TRACE
163 select TRACE_IRQFLAGS_SUPPORT
164 select USE_PERCPU_NUMA_NODE_ID
165 select USER_STACKTRACE_SUPPORT
178 config GENERIC_BUG_RELATIVE_POINTERS
180 depends on GENERIC_BUG
182 config GENERIC_CALIBRATE_DELAY
188 config GENERIC_HWEIGHT
191 config L1_CACHE_SHIFT
195 config LOCKDEP_SUPPORT
199 config STACKTRACE_SUPPORT
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.
206 config MACH_LOONGSON32
209 config MACH_LOONGSON64
212 config FIX_EARLYCON_MEM
218 config PAGE_SIZE_16KB
221 config PAGE_SIZE_64KB
224 config PGTABLE_2LEVEL
227 config PGTABLE_3LEVEL
230 config PGTABLE_4LEVEL
233 config PGTABLE_LEVELS
235 default 2 if PGTABLE_2LEVEL
236 default 3 if PGTABLE_3LEVEL
237 default 4 if PGTABLE_4LEVEL
239 config SCHED_OMIT_FRAME_POINTER
243 config AS_HAS_EXPLICIT_RELOCS
244 def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x))
246 config AS_HAS_FCSR_CLASS
247 def_bool $(as-instr,movfcsr2gr \$t0$(comma)\$fcsr0)
249 config AS_HAS_LSX_EXTENSION
250 def_bool $(as-instr,vld \$vr0$(comma)\$a0$(comma)0)
252 config AS_HAS_LASX_EXTENSION
253 def_bool $(as-instr,xvld \$xr0$(comma)\$a0$(comma)0)
255 menu "Kernel type and options"
257 source "kernel/Kconfig.hz"
260 prompt "Page Table Layout"
261 default 16KB_2LEVEL if 32BIT
262 default 16KB_3LEVEL if 64BIT
264 Allows choosing the page table layout, which is a combination
265 of page size and page table levels. The size of virtual memory
266 address space are determined by the page table layout.
269 bool "4KB with 3 levels"
271 select PGTABLE_3LEVEL
273 This option selects 4KB page size with 3 level page tables, which
274 support a maximum of 39 bits of application virtual memory.
277 bool "4KB with 4 levels"
279 select PGTABLE_4LEVEL
281 This option selects 4KB page size with 4 level page tables, which
282 support a maximum of 48 bits of application virtual memory.
285 bool "16KB with 2 levels"
286 select PAGE_SIZE_16KB
287 select PGTABLE_2LEVEL
289 This option selects 16KB page size with 2 level page tables, which
290 support a maximum of 36 bits of application virtual memory.
293 bool "16KB with 3 levels"
294 select PAGE_SIZE_16KB
295 select PGTABLE_3LEVEL
297 This option selects 16KB page size with 3 level page tables, which
298 support a maximum of 47 bits of application virtual memory.
301 bool "64KB with 2 levels"
302 select PAGE_SIZE_64KB
303 select PGTABLE_2LEVEL
305 This option selects 64KB page size with 2 level page tables, which
306 support a maximum of 42 bits of application virtual memory.
309 bool "64KB with 3 levels"
310 select PAGE_SIZE_64KB
311 select PGTABLE_3LEVEL
313 This option selects 64KB page size with 3 level page tables, which
314 support a maximum of 55 bits of application virtual memory.
319 string "Built-in kernel command line"
321 For most platforms, the arguments for the kernel's command line
322 are provided at run-time, during boot. However, there are cases
323 where either no arguments are being provided or the provided
324 arguments are insufficient or even invalid.
326 When that occurs, it is possible to define a built-in command
327 line here and choose how the kernel should use it later on.
330 prompt "Kernel command line type"
331 default CMDLINE_BOOTLOADER
333 Choose how the kernel will handle the provided built-in command
336 config CMDLINE_BOOTLOADER
337 bool "Use bootloader kernel arguments if available"
339 Prefer the command-line passed by the boot loader if available.
340 Use the built-in command line as fallback in case we get nothing
341 during boot. This is the default behaviour.
343 config CMDLINE_EXTEND
344 bool "Use built-in to extend bootloader kernel arguments"
346 The command-line arguments provided during boot will be
347 appended to the built-in command line. This is useful in
348 cases where the provided arguments are insufficient and
349 you don't want to or cannot modify them.
352 bool "Always use the built-in kernel command string"
354 Always use the built-in command line, even if we get one during
355 boot. This is useful in case you need to override the provided
356 command line on systems where you don't have or want control
362 bool "Enable DMI scanning"
363 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
366 This enables SMBIOS/DMI feature for systems, and scanning of
367 DMI to identify machine quirks.
370 bool "EFI runtime service support"
372 select EFI_RUNTIME_WRAPPERS
374 This enables the kernel to use EFI runtime services that are
375 available (such as the EFI variable services).
378 bool "EFI boot stub support"
381 select EFI_GENERIC_STUB
383 This kernel feature allows the kernel to be loaded directly by
384 EFI firmware without the use of a bootloader.
387 bool "SMT scheduler support"
390 Improves scheduler's performance when there are multiple
391 threads in one physical core.
394 bool "Multi-Processing support"
396 This enables support for systems with more than one CPU. If you have
397 a system with only one CPU, say N. If you have a system with more
400 If you say N here, the kernel will run on uni- and multiprocessor
401 machines, but will use only one CPU of a multiprocessor machine. If
402 you say Y here, the kernel will run on many, but not all,
403 uniprocessor machines. On a uniprocessor machine, the kernel
404 will run faster if you say N here.
406 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>.
408 If you don't know what to do here, say N.
411 bool "Support for hot-pluggable CPUs"
413 select GENERIC_IRQ_MIGRATION
415 Say Y here to allow turning CPUs off and on. CPUs can be
416 controlled through /sys/devices/system/cpu.
417 (Note: power management support will enable this option
418 automatically on SMP systems. )
419 Say N if you want to disable CPU hotplug.
422 int "Maximum number of CPUs (2-256)"
427 This allows you to specify the maximum number of CPUs which this
433 select ACPI_NUMA if ACPI
435 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access)
436 support. This option improves performance on systems with more
437 than one NUMA node; on single node systems it is generally better
438 to leave it disabled.
445 config ARCH_FORCE_MAX_ORDER
446 int "Maximum zone order"
447 default "13" if PAGE_SIZE_64KB
448 default "11" if PAGE_SIZE_16KB
451 The kernel memory allocator divides physically contiguous memory
452 blocks into "zones", where each zone is a power of two number of
453 pages. This option selects the largest power of two that the kernel
454 keeps in the memory allocator. If you need to allocate very large
455 blocks of physically contiguous memory, then you may need to
458 The page size is not necessarily 4KB. Keep this in mind
459 when choosing a value for this option.
462 bool "Enable LoongArch DMW-based ioremap()"
464 We use generic TLB-based ioremap() by default since it has page
465 protection support. However, you can enable LoongArch DMW-based
466 ioremap() for better performance.
468 config ARCH_WRITECOMBINE
469 bool "Enable WriteCombine (WUC) for ioremap()"
471 LoongArch maintains cache coherency in hardware, but when paired
472 with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which
473 is similar to WriteCombine) is out of the scope of cache coherency
474 machanism for PCIe devices (this is a PCIe protocol violation, which
475 may be fixed in newer chipsets).
477 This means WUC can only used for write-only memory regions now, so
478 this option is disabled by default, making WUC silently fallback to
479 SUC for ioremap(). You can enable this option if the kernel is ensured
480 to run on hardware without this bug.
482 You can override this setting via writecombine=on/off boot parameter.
484 config ARCH_STRICT_ALIGN
485 bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT
488 Not all LoongArch cores support h/w unaligned access, we can use
489 -mstrict-align build parameter to prevent unaligned accesses.
491 CPUs with h/w unaligned access support:
492 Loongson-2K2000/2K3000/3A5000/3C5000/3D5000.
494 CPUs without h/w unaligned access support:
495 Loongson-2K500/2K1000.
497 This option is enabled by default to make the kernel be able to run
498 on all LoongArch systems. But you can disable it manually if you want
499 to run kernel only on systems with h/w unaligned access support in
500 order to optimise for performance.
507 bool "Support for the Loongson SIMD Extension"
508 depends on AS_HAS_LSX_EXTENSION
510 Loongson SIMD Extension (LSX) introduces 128 bit wide vector registers
511 and a set of SIMD instructions to operate on them. When this option
512 is enabled the kernel will support allocating & switching LSX
513 vector register contexts. If you know that your kernel will only be
514 running on CPUs which do not support LSX or that your userland will
515 not be making use of it then you may wish to say N here to reduce
516 the size & complexity of your kernel.
521 bool "Support for the Loongson Advanced SIMD Extension"
522 depends on CPU_HAS_LSX
523 depends on AS_HAS_LASX_EXTENSION
525 Loongson Advanced SIMD Extension (LASX) introduces 256 bit wide vector
526 registers and a set of SIMD instructions to operate on them. When this
527 option is enabled the kernel will support allocating & switching LASX
528 vector register contexts. If you know that your kernel will only be
529 running on CPUs which do not support LASX or that your userland will
530 not be making use of it then you may wish to say N here to reduce
531 the size & complexity of your kernel.
535 config CPU_HAS_PREFETCH
540 bool "Kexec system call"
543 kexec is a system call that implements the ability to shutdown your
544 current kernel, and to start another kernel. It is like a reboot
545 but it is independent of the system firmware. And like a reboot
546 you can start any kernel with it, not just Linux.
548 The name comes from the similarity to the exec system call.
551 bool "Build kdump crash kernel"
554 Generate crash dump after being started by kexec. This should
555 be normally only set in special crash dump kernels which are
556 loaded in the main kernel with kexec-tools into a specially
557 reserved region and then later executed after a crash by
560 For more details see Documentation/admin-guide/kdump/kdump.rst
563 bool "Relocatable kernel"
565 This builds the kernel as a Position Independent Executable (PIE),
566 which retains all relocation metadata required, so as to relocate
567 the kernel binary at runtime to a different virtual address from
570 config RANDOMIZE_BASE
571 bool "Randomize the address of the kernel (KASLR)"
572 depends on RELOCATABLE
574 Randomizes the physical and virtual address at which the
575 kernel image is loaded, as a security feature that
576 deters exploit attempts relying on knowledge of the location
579 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET.
583 config RANDOMIZE_BASE_MAX_OFFSET
584 hex "Maximum KASLR offset" if EXPERT
585 depends on RANDOMIZE_BASE
589 When KASLR is active, this provides the maximum offset that will
590 be applied to the kernel image. It should be set according to the
591 amount of physical RAM available in the target system.
593 This is limited by the size of the lower address memory, 256MB.
596 bool "Enable seccomp to safely compute untrusted bytecode"
600 This kernel feature is useful for number crunching applications
601 that may need to compute untrusted bytecode during their
602 execution. By using pipes or other transports made available to
603 the process as file descriptors supporting the read/write
604 syscalls, it's possible to isolate those applications in
605 their own address space using seccomp. Once seccomp is
606 enabled via /proc/<pid>/seccomp, it cannot be disabled
607 and the task is only allowed to execute a few safe syscalls
608 defined by each seccomp mode.
610 If unsure, say Y. Only embedded should say N here.
614 config ARCH_SELECT_MEMORY_MODEL
617 config ARCH_FLATMEM_ENABLE
621 config ARCH_SPARSEMEM_ENABLE
623 select SPARSEMEM_VMEMMAP_ENABLE
625 Say Y to support efficient handling of sparse physical memory,
626 for architectures which are either NUMA (Non-Uniform Memory Access)
627 or have huge holes in the physical address space for other reasons.
628 See <file:Documentation/mm/numa.rst> for more.
630 config ARCH_ENABLE_THP_MIGRATION
632 depends on TRANSPARENT_HUGEPAGE
634 config ARCH_MEMORY_PROBE
636 depends on MEMORY_HOTPLUG
642 config ARCH_MMAP_RND_BITS_MIN
645 config ARCH_MMAP_RND_BITS_MAX
648 config ARCH_SUPPORTS_UPROBES
651 menu "Power management options"
653 config ARCH_SUSPEND_POSSIBLE
656 config ARCH_HIBERNATION_POSSIBLE
659 source "kernel/power/Kconfig"
660 source "drivers/acpi/Kconfig"
664 source "drivers/firmware/Kconfig"