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_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
49 select ARCH_SUPPORTS_ACPI
50 select ARCH_SUPPORTS_ATOMIC_RMW
51 select ARCH_SUPPORTS_HUGETLBFS
52 select ARCH_SUPPORTS_LTO_CLANG
53 select ARCH_SUPPORTS_LTO_CLANG_THIN
54 select ARCH_SUPPORTS_NUMA_BALANCING
55 select ARCH_USE_BUILTIN_BSWAP
56 select ARCH_USE_CMPXCHG_LOCKREF
57 select ARCH_USE_QUEUED_RWLOCKS
58 select ARCH_USE_QUEUED_SPINLOCKS
59 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
60 select ARCH_WANT_LD_ORPHAN_WARN
61 select ARCH_WANT_OPTIMIZE_VMEMMAP
62 select ARCH_WANTS_NO_INSTR
63 select BUILDTIME_TABLE_SORT
67 select GENERIC_CLOCKEVENTS
68 select GENERIC_CMOS_UPDATE
69 select GENERIC_CPU_AUTOPROBE
71 select GENERIC_GETTIMEOFDAY
72 select GENERIC_IOREMAP if !ARCH_IOREMAP
73 select GENERIC_IRQ_MULTI_HANDLER
74 select GENERIC_IRQ_PROBE
75 select GENERIC_IRQ_SHOW
76 select GENERIC_LIB_ASHLDI3
77 select GENERIC_LIB_ASHRDI3
78 select GENERIC_LIB_CMPDI2
79 select GENERIC_LIB_LSHRDI3
80 select GENERIC_LIB_UCMPDI2
81 select GENERIC_LIB_DEVMEM_IS_ALLOWED
82 select GENERIC_PCI_IOMAP
83 select GENERIC_SCHED_CLOCK
84 select GENERIC_SMP_IDLE_THREAD
85 select GENERIC_TIME_VSYSCALL
86 select GENERIC_VDSO_TIME_NS
89 select HAVE_ARCH_AUDITSYSCALL
90 select HAVE_ARCH_MMAP_RND_BITS if MMU
91 select HAVE_ARCH_SECCOMP_FILTER
92 select HAVE_ARCH_TRACEHOOK
93 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
94 select HAVE_ASM_MODVERSIONS
95 select HAVE_CONTEXT_TRACKING_USER
96 select HAVE_C_RECORDMCOUNT
97 select HAVE_DEBUG_STACKOVERFLOW
98 select HAVE_DMA_CONTIGUOUS
99 select HAVE_DYNAMIC_FTRACE
100 select HAVE_DYNAMIC_FTRACE_WITH_ARGS
101 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
102 select HAVE_DYNAMIC_FTRACE_WITH_REGS
104 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !ARCH_STRICT_ALIGN
105 select HAVE_EXIT_THREAD
107 select HAVE_FTRACE_MCOUNT_RECORD
108 select HAVE_FUNCTION_ARG_ACCESS_API
109 select HAVE_FUNCTION_ERROR_INJECTION
110 select HAVE_FUNCTION_GRAPH_TRACER
111 select HAVE_FUNCTION_TRACER
112 select HAVE_GENERIC_VDSO
113 select HAVE_HW_BREAKPOINT if PERF_EVENTS
114 select HAVE_IOREMAP_PROT
115 select HAVE_IRQ_EXIT_ON_IRQ_STACK
116 select HAVE_IRQ_TIME_ACCOUNTING
118 select HAVE_KPROBES_ON_FTRACE
119 select HAVE_KRETPROBES
120 select HAVE_MOD_ARCH_SPECIFIC
123 select HAVE_PERF_EVENTS
124 select HAVE_PERF_REGS
125 select HAVE_PERF_USER_STACK_DUMP
126 select HAVE_REGS_AND_STACK_ACCESS_API
128 select HAVE_SAMPLE_FTRACE_DIRECT
129 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
130 select HAVE_SETUP_PER_CPU_AREA if NUMA
131 select HAVE_STACKPROTECTOR
132 select HAVE_SYSCALL_TRACEPOINTS
134 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP
135 select IRQ_FORCED_THREADING
136 select IRQ_LOONGARCH_CPU
137 select MMU_GATHER_MERGE_VMAS if MMU
138 select MODULES_USE_ELF_RELA if MODULES
139 select NEED_PER_CPU_EMBED_FIRST_CHUNK
140 select NEED_PER_CPU_PAGE_FIRST_CHUNK
142 select OF_EARLY_FLATTREE
144 select PCI_DOMAINS_GENERIC
145 select PCI_ECAM if ACPI
147 select PCI_MSI_ARCH_FALLBACKS
149 select PERF_USE_VMALLOC
153 select SYSCTL_ARCH_UNALIGN_ALLOW
154 select SYSCTL_ARCH_UNALIGN_NO_WARN
155 select SYSCTL_EXCEPTION_TRACE
157 select TRACE_IRQFLAGS_SUPPORT
158 select USE_PERCPU_NUMA_NODE_ID
159 select USER_STACKTRACE_SUPPORT
172 config GENERIC_BUG_RELATIVE_POINTERS
174 depends on GENERIC_BUG
176 config GENERIC_CALIBRATE_DELAY
182 config GENERIC_HWEIGHT
185 config L1_CACHE_SHIFT
189 config LOCKDEP_SUPPORT
193 config STACKTRACE_SUPPORT
197 # MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the
198 # MIPS Loongson code, to preserve Loongson-specific code paths in drivers that
199 # are shared between architectures, and specifically expecting the symbols.
200 config MACH_LOONGSON32
203 config MACH_LOONGSON64
206 config FIX_EARLYCON_MEM
212 config PAGE_SIZE_16KB
215 config PAGE_SIZE_64KB
218 config PGTABLE_2LEVEL
221 config PGTABLE_3LEVEL
224 config PGTABLE_4LEVEL
227 config PGTABLE_LEVELS
229 default 2 if PGTABLE_2LEVEL
230 default 3 if PGTABLE_3LEVEL
231 default 4 if PGTABLE_4LEVEL
233 config SCHED_OMIT_FRAME_POINTER
237 config AS_HAS_EXPLICIT_RELOCS
238 def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x))
240 config AS_HAS_FCSR_CLASS
241 def_bool $(as-instr,movfcsr2gr \$t0$(comma)\$fcsr0)
243 config AS_HAS_LSX_EXTENSION
244 def_bool $(as-instr,vld \$vr0$(comma)\$a0$(comma)0)
246 config AS_HAS_LASX_EXTENSION
247 def_bool $(as-instr,xvld \$xr0$(comma)\$a0$(comma)0)
249 menu "Kernel type and options"
251 source "kernel/Kconfig.hz"
254 prompt "Page Table Layout"
255 default 16KB_2LEVEL if 32BIT
256 default 16KB_3LEVEL if 64BIT
258 Allows choosing the page table layout, which is a combination
259 of page size and page table levels. The size of virtual memory
260 address space are determined by the page table layout.
263 bool "4KB with 3 levels"
265 select PGTABLE_3LEVEL
267 This option selects 4KB page size with 3 level page tables, which
268 support a maximum of 39 bits of application virtual memory.
271 bool "4KB with 4 levels"
273 select PGTABLE_4LEVEL
275 This option selects 4KB page size with 4 level page tables, which
276 support a maximum of 48 bits of application virtual memory.
279 bool "16KB with 2 levels"
280 select PAGE_SIZE_16KB
281 select PGTABLE_2LEVEL
283 This option selects 16KB page size with 2 level page tables, which
284 support a maximum of 36 bits of application virtual memory.
287 bool "16KB with 3 levels"
288 select PAGE_SIZE_16KB
289 select PGTABLE_3LEVEL
291 This option selects 16KB page size with 3 level page tables, which
292 support a maximum of 47 bits of application virtual memory.
295 bool "64KB with 2 levels"
296 select PAGE_SIZE_64KB
297 select PGTABLE_2LEVEL
299 This option selects 64KB page size with 2 level page tables, which
300 support a maximum of 42 bits of application virtual memory.
303 bool "64KB with 3 levels"
304 select PAGE_SIZE_64KB
305 select PGTABLE_3LEVEL
307 This option selects 64KB page size with 3 level page tables, which
308 support a maximum of 55 bits of application virtual memory.
313 string "Built-in kernel command line"
315 For most platforms, the arguments for the kernel's command line
316 are provided at run-time, during boot. However, there are cases
317 where either no arguments are being provided or the provided
318 arguments are insufficient or even invalid.
320 When that occurs, it is possible to define a built-in command
321 line here and choose how the kernel should use it later on.
324 prompt "Kernel command line type"
325 default CMDLINE_BOOTLOADER
327 Choose how the kernel will handle the provided built-in command
330 config CMDLINE_BOOTLOADER
331 bool "Use bootloader kernel arguments if available"
333 Prefer the command-line passed by the boot loader if available.
334 Use the built-in command line as fallback in case we get nothing
335 during boot. This is the default behaviour.
337 config CMDLINE_EXTEND
338 bool "Use built-in to extend bootloader kernel arguments"
340 The command-line arguments provided during boot will be
341 appended to the built-in command line. This is useful in
342 cases where the provided arguments are insufficient and
343 you don't want to or cannot modify them.
346 bool "Always use the built-in kernel command string"
348 Always use the built-in command line, even if we get one during
349 boot. This is useful in case you need to override the provided
350 command line on systems where you don't have or want control
356 bool "Enable DMI scanning"
357 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
360 This enables SMBIOS/DMI feature for systems, and scanning of
361 DMI to identify machine quirks.
364 bool "EFI runtime service support"
366 select EFI_RUNTIME_WRAPPERS
368 This enables the kernel to use EFI runtime services that are
369 available (such as the EFI variable services).
372 bool "EFI boot stub support"
375 select EFI_GENERIC_STUB
377 This kernel feature allows the kernel to be loaded directly by
378 EFI firmware without the use of a bootloader.
381 bool "SMT scheduler support"
384 Improves scheduler's performance when there are multiple
385 threads in one physical core.
388 bool "Multi-Processing support"
390 This enables support for systems with more than one CPU. If you have
391 a system with only one CPU, say N. If you have a system with more
394 If you say N here, the kernel will run on uni- and multiprocessor
395 machines, but will use only one CPU of a multiprocessor machine. If
396 you say Y here, the kernel will run on many, but not all,
397 uniprocessor machines. On a uniprocessor machine, the kernel
398 will run faster if you say N here.
400 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>.
402 If you don't know what to do here, say N.
405 bool "Support for hot-pluggable CPUs"
407 select GENERIC_IRQ_MIGRATION
409 Say Y here to allow turning CPUs off and on. CPUs can be
410 controlled through /sys/devices/system/cpu.
411 (Note: power management support will enable this option
412 automatically on SMP systems. )
413 Say N if you want to disable CPU hotplug.
416 int "Maximum number of CPUs (2-256)"
421 This allows you to specify the maximum number of CPUs which this
427 select ACPI_NUMA if ACPI
429 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access)
430 support. This option improves performance on systems with more
431 than one NUMA node; on single node systems it is generally better
432 to leave it disabled.
439 config ARCH_FORCE_MAX_ORDER
440 int "Maximum zone order"
441 default "13" if PAGE_SIZE_64KB
442 default "11" if PAGE_SIZE_16KB
445 The kernel memory allocator divides physically contiguous memory
446 blocks into "zones", where each zone is a power of two number of
447 pages. This option selects the largest power of two that the kernel
448 keeps in the memory allocator. If you need to allocate very large
449 blocks of physically contiguous memory, then you may need to
452 The page size is not necessarily 4KB. Keep this in mind
453 when choosing a value for this option.
456 bool "Enable LoongArch DMW-based ioremap()"
458 We use generic TLB-based ioremap() by default since it has page
459 protection support. However, you can enable LoongArch DMW-based
460 ioremap() for better performance.
462 config ARCH_WRITECOMBINE
463 bool "Enable WriteCombine (WUC) for ioremap()"
465 LoongArch maintains cache coherency in hardware, but when paired
466 with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which
467 is similar to WriteCombine) is out of the scope of cache coherency
468 machanism for PCIe devices (this is a PCIe protocol violation, which
469 may be fixed in newer chipsets).
471 This means WUC can only used for write-only memory regions now, so
472 this option is disabled by default, making WUC silently fallback to
473 SUC for ioremap(). You can enable this option if the kernel is ensured
474 to run on hardware without this bug.
476 You can override this setting via writecombine=on/off boot parameter.
478 config ARCH_STRICT_ALIGN
479 bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT
482 Not all LoongArch cores support h/w unaligned access, we can use
483 -mstrict-align build parameter to prevent unaligned accesses.
485 CPUs with h/w unaligned access support:
486 Loongson-2K2000/2K3000/3A5000/3C5000/3D5000.
488 CPUs without h/w unaligned access support:
489 Loongson-2K500/2K1000.
491 This option is enabled by default to make the kernel be able to run
492 on all LoongArch systems. But you can disable it manually if you want
493 to run kernel only on systems with h/w unaligned access support in
494 order to optimise for performance.
501 bool "Support for the Loongson SIMD Extension"
502 depends on AS_HAS_LSX_EXTENSION
504 Loongson SIMD Extension (LSX) introduces 128 bit wide vector registers
505 and a set of SIMD instructions to operate on them. When this option
506 is enabled the kernel will support allocating & switching LSX
507 vector register contexts. If you know that your kernel will only be
508 running on CPUs which do not support LSX or that your userland will
509 not be making use of it then you may wish to say N here to reduce
510 the size & complexity of your kernel.
515 bool "Support for the Loongson Advanced SIMD Extension"
516 depends on CPU_HAS_LSX
517 depends on AS_HAS_LASX_EXTENSION
519 Loongson Advanced SIMD Extension (LASX) introduces 256 bit wide vector
520 registers and a set of SIMD instructions to operate on them. When this
521 option is enabled the kernel will support allocating & switching LASX
522 vector register contexts. If you know that your kernel will only be
523 running on CPUs which do not support LASX or that your userland will
524 not be making use of it then you may wish to say N here to reduce
525 the size & complexity of your kernel.
529 config CPU_HAS_PREFETCH
534 bool "Kexec system call"
537 kexec is a system call that implements the ability to shutdown your
538 current kernel, and to start another kernel. It is like a reboot
539 but it is independent of the system firmware. And like a reboot
540 you can start any kernel with it, not just Linux.
542 The name comes from the similarity to the exec system call.
545 bool "Build kdump crash kernel"
548 Generate crash dump after being started by kexec. This should
549 be normally only set in special crash dump kernels which are
550 loaded in the main kernel with kexec-tools into a specially
551 reserved region and then later executed after a crash by
554 For more details see Documentation/admin-guide/kdump/kdump.rst
557 bool "Relocatable kernel"
559 This builds the kernel as a Position Independent Executable (PIE),
560 which retains all relocation metadata required, so as to relocate
561 the kernel binary at runtime to a different virtual address from
564 config RANDOMIZE_BASE
565 bool "Randomize the address of the kernel (KASLR)"
566 depends on RELOCATABLE
568 Randomizes the physical and virtual address at which the
569 kernel image is loaded, as a security feature that
570 deters exploit attempts relying on knowledge of the location
573 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET.
577 config RANDOMIZE_BASE_MAX_OFFSET
578 hex "Maximum KASLR offset" if EXPERT
579 depends on RANDOMIZE_BASE
583 When KASLR is active, this provides the maximum offset that will
584 be applied to the kernel image. It should be set according to the
585 amount of physical RAM available in the target system.
587 This is limited by the size of the lower address memory, 256MB.
590 bool "Enable seccomp to safely compute untrusted bytecode"
594 This kernel feature is useful for number crunching applications
595 that may need to compute untrusted bytecode during their
596 execution. By using pipes or other transports made available to
597 the process as file descriptors supporting the read/write
598 syscalls, it's possible to isolate those applications in
599 their own address space using seccomp. Once seccomp is
600 enabled via /proc/<pid>/seccomp, it cannot be disabled
601 and the task is only allowed to execute a few safe syscalls
602 defined by each seccomp mode.
604 If unsure, say Y. Only embedded should say N here.
608 config ARCH_SELECT_MEMORY_MODEL
611 config ARCH_FLATMEM_ENABLE
615 config ARCH_SPARSEMEM_ENABLE
617 select SPARSEMEM_VMEMMAP_ENABLE
619 Say Y to support efficient handling of sparse physical memory,
620 for architectures which are either NUMA (Non-Uniform Memory Access)
621 or have huge holes in the physical address space for other reasons.
622 See <file:Documentation/mm/numa.rst> for more.
624 config ARCH_ENABLE_THP_MIGRATION
626 depends on TRANSPARENT_HUGEPAGE
628 config ARCH_MEMORY_PROBE
630 depends on MEMORY_HOTPLUG
636 config ARCH_MMAP_RND_BITS_MIN
639 config ARCH_MMAP_RND_BITS_MAX
642 menu "Power management options"
644 config ARCH_SUSPEND_POSSIBLE
647 config ARCH_HIBERNATION_POSSIBLE
650 source "kernel/power/Kconfig"
651 source "drivers/acpi/Kconfig"
655 source "drivers/firmware/Kconfig"