1 # SPDX-License-Identifier: GPL-2.0
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_PTE_SPECIAL
14 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
15 select ARCH_INLINE_READ_LOCK if !PREEMPTION
16 select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION
17 select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION
18 select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION
19 select ARCH_INLINE_READ_UNLOCK if !PREEMPTION
20 select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION
21 select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION
22 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION
23 select ARCH_INLINE_WRITE_LOCK if !PREEMPTION
24 select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION
25 select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION
26 select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION
27 select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION
28 select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION
29 select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION
30 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION
31 select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION
32 select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION
33 select ARCH_INLINE_SPIN_LOCK if !PREEMPTION
34 select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION
35 select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION
36 select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION
37 select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION
38 select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION
39 select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION
40 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION
41 select ARCH_KEEP_MEMBLOCK
42 select ARCH_MIGHT_HAVE_PC_PARPORT
43 select ARCH_MIGHT_HAVE_PC_SERIO
44 select ARCH_SPARSEMEM_ENABLE
46 select ARCH_SUPPORTS_ACPI
47 select ARCH_SUPPORTS_ATOMIC_RMW
48 select ARCH_SUPPORTS_HUGETLBFS
49 select ARCH_SUPPORTS_NUMA_BALANCING
50 select ARCH_USE_BUILTIN_BSWAP
51 select ARCH_USE_CMPXCHG_LOCKREF
52 select ARCH_USE_QUEUED_RWLOCKS
53 select ARCH_USE_QUEUED_SPINLOCKS
54 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
55 select ARCH_WANT_LD_ORPHAN_WARN
56 select ARCH_WANTS_NO_INSTR
57 select BUILDTIME_TABLE_SORT
61 select GENERIC_CLOCKEVENTS
62 select GENERIC_CMOS_UPDATE
63 select GENERIC_CPU_AUTOPROBE
65 select GENERIC_GETTIMEOFDAY
66 select GENERIC_IOREMAP if !ARCH_IOREMAP
67 select GENERIC_IRQ_MULTI_HANDLER
68 select GENERIC_IRQ_PROBE
69 select GENERIC_IRQ_SHOW
70 select GENERIC_LIB_ASHLDI3
71 select GENERIC_LIB_ASHRDI3
72 select GENERIC_LIB_CMPDI2
73 select GENERIC_LIB_LSHRDI3
74 select GENERIC_LIB_UCMPDI2
75 select GENERIC_LIB_DEVMEM_IS_ALLOWED
76 select GENERIC_PCI_IOMAP
77 select GENERIC_SCHED_CLOCK
78 select GENERIC_SMP_IDLE_THREAD
79 select GENERIC_TIME_VSYSCALL
81 select HAVE_ARCH_AUDITSYSCALL
82 select HAVE_ARCH_MMAP_RND_BITS if MMU
83 select HAVE_ARCH_SECCOMP_FILTER
84 select HAVE_ARCH_TRACEHOOK
85 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
86 select HAVE_ASM_MODVERSIONS
87 select HAVE_CONTEXT_TRACKING_USER
88 select HAVE_C_RECORDMCOUNT
89 select HAVE_DEBUG_STACKOVERFLOW
90 select HAVE_DMA_CONTIGUOUS
92 select HAVE_EXIT_THREAD
94 select HAVE_FTRACE_MCOUNT_RECORD
95 select HAVE_FUNCTION_GRAPH_TRACER
96 select HAVE_FUNCTION_TRACER
97 select HAVE_GENERIC_VDSO
98 select HAVE_IOREMAP_PROT
99 select HAVE_IRQ_EXIT_ON_IRQ_STACK
100 select HAVE_IRQ_TIME_ACCOUNTING
101 select HAVE_MOD_ARCH_SPECIFIC
104 select HAVE_PERF_EVENTS
105 select HAVE_PERF_REGS
106 select HAVE_PERF_USER_STACK_DUMP
107 select HAVE_REGS_AND_STACK_ACCESS_API
109 select HAVE_SETUP_PER_CPU_AREA if NUMA
110 select HAVE_STACKPROTECTOR
111 select HAVE_SYSCALL_TRACEPOINTS
113 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP
114 select IRQ_FORCED_THREADING
115 select IRQ_LOONGARCH_CPU
116 select MMU_GATHER_MERGE_VMAS if MMU
117 select MODULES_USE_ELF_RELA if MODULES
118 select NEED_PER_CPU_EMBED_FIRST_CHUNK
119 select NEED_PER_CPU_PAGE_FIRST_CHUNK
121 select OF_EARLY_FLATTREE
123 select PCI_DOMAINS_GENERIC
124 select PCI_ECAM if ACPI
126 select PCI_MSI_ARCH_FALLBACKS
128 select PERF_USE_VMALLOC
132 select SYSCTL_ARCH_UNALIGN_ALLOW
133 select SYSCTL_ARCH_UNALIGN_NO_WARN
134 select SYSCTL_EXCEPTION_TRACE
136 select TRACE_IRQFLAGS_SUPPORT
137 select USE_PERCPU_NUMA_NODE_ID
138 select USER_STACKTRACE_SUPPORT
151 config CPU_HAS_PREFETCH
159 config GENERIC_BUG_RELATIVE_POINTERS
161 depends on GENERIC_BUG
163 config GENERIC_CALIBRATE_DELAY
169 config GENERIC_HWEIGHT
172 config L1_CACHE_SHIFT
176 config LOCKDEP_SUPPORT
180 config STACKTRACE_SUPPORT
184 # MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the
185 # MIPS Loongson code, to preserve Loongson-specific code paths in drivers that
186 # are shared between architectures, and specifically expecting the symbols.
187 config MACH_LOONGSON32
190 config MACH_LOONGSON64
193 config FIX_EARLYCON_MEM
199 config PAGE_SIZE_16KB
202 config PAGE_SIZE_64KB
205 config PGTABLE_2LEVEL
208 config PGTABLE_3LEVEL
211 config PGTABLE_4LEVEL
214 config PGTABLE_LEVELS
216 default 2 if PGTABLE_2LEVEL
217 default 3 if PGTABLE_3LEVEL
218 default 4 if PGTABLE_4LEVEL
220 config SCHED_OMIT_FRAME_POINTER
224 config AS_HAS_EXPLICIT_RELOCS
225 def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x))
227 menu "Kernel type and options"
229 source "kernel/Kconfig.hz"
232 prompt "Page Table Layout"
233 default 16KB_2LEVEL if 32BIT
234 default 16KB_3LEVEL if 64BIT
236 Allows choosing the page table layout, which is a combination
237 of page size and page table levels. The size of virtual memory
238 address space are determined by the page table layout.
241 bool "4KB with 3 levels"
243 select PGTABLE_3LEVEL
245 This option selects 4KB page size with 3 level page tables, which
246 support a maximum of 39 bits of application virtual memory.
249 bool "4KB with 4 levels"
251 select PGTABLE_4LEVEL
253 This option selects 4KB page size with 4 level page tables, which
254 support a maximum of 48 bits of application virtual memory.
257 bool "16KB with 2 levels"
258 select PAGE_SIZE_16KB
259 select PGTABLE_2LEVEL
261 This option selects 16KB page size with 2 level page tables, which
262 support a maximum of 36 bits of application virtual memory.
265 bool "16KB with 3 levels"
266 select PAGE_SIZE_16KB
267 select PGTABLE_3LEVEL
269 This option selects 16KB page size with 3 level page tables, which
270 support a maximum of 47 bits of application virtual memory.
273 bool "64KB with 2 levels"
274 select PAGE_SIZE_64KB
275 select PGTABLE_2LEVEL
277 This option selects 64KB page size with 2 level page tables, which
278 support a maximum of 42 bits of application virtual memory.
281 bool "64KB with 3 levels"
282 select PAGE_SIZE_64KB
283 select PGTABLE_3LEVEL
285 This option selects 64KB page size with 3 level page tables, which
286 support a maximum of 55 bits of application virtual memory.
291 string "Built-in kernel command line"
293 For most platforms, the arguments for the kernel's command line
294 are provided at run-time, during boot. However, there are cases
295 where either no arguments are being provided or the provided
296 arguments are insufficient or even invalid.
298 When that occurs, it is possible to define a built-in command
299 line here and choose how the kernel should use it later on.
302 prompt "Kernel command line type"
303 default CMDLINE_BOOTLOADER
305 Choose how the kernel will handle the provided built-in command
308 config CMDLINE_BOOTLOADER
309 bool "Use bootloader kernel arguments if available"
311 Prefer the command-line passed by the boot loader if available.
312 Use the built-in command line as fallback in case we get nothing
313 during boot. This is the default behaviour.
315 config CMDLINE_EXTEND
316 bool "Use built-in to extend bootloader kernel arguments"
318 The command-line arguments provided during boot will be
319 appended to the built-in command line. This is useful in
320 cases where the provided arguments are insufficient and
321 you don't want to or cannot modify them.
324 bool "Always use the built-in kernel command string"
326 Always use the built-in command line, even if we get one during
327 boot. This is useful in case you need to override the provided
328 command line on systems where you don't have or want control
334 bool "Enable DMI scanning"
335 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
338 This enables SMBIOS/DMI feature for systems, and scanning of
339 DMI to identify machine quirks.
342 bool "EFI runtime service support"
344 select EFI_RUNTIME_WRAPPERS
346 This enables the kernel to use EFI runtime services that are
347 available (such as the EFI variable services).
350 bool "EFI boot stub support"
353 select EFI_GENERIC_STUB
355 This kernel feature allows the kernel to be loaded directly by
356 EFI firmware without the use of a bootloader.
359 bool "Multi-Processing support"
361 This enables support for systems with more than one CPU. If you have
362 a system with only one CPU, say N. If you have a system with more
365 If you say N here, the kernel will run on uni- and multiprocessor
366 machines, but will use only one CPU of a multiprocessor machine. If
367 you say Y here, the kernel will run on many, but not all,
368 uniprocessor machines. On a uniprocessor machine, the kernel
369 will run faster if you say N here.
371 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>.
373 If you don't know what to do here, say N.
376 bool "Support for hot-pluggable CPUs"
378 select GENERIC_IRQ_MIGRATION
380 Say Y here to allow turning CPUs off and on. CPUs can be
381 controlled through /sys/devices/system/cpu.
382 (Note: power management support will enable this option
383 automatically on SMP systems. )
384 Say N if you want to disable CPU hotplug.
387 int "Maximum number of CPUs (2-256)"
392 This allows you to specify the maximum number of CPUs which this
398 select ACPI_NUMA if ACPI
400 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access)
401 support. This option improves performance on systems with more
402 than one NUMA node; on single node systems it is generally better
403 to leave it disabled.
410 config ARCH_FORCE_MAX_ORDER
411 int "Maximum zone order"
412 range 14 64 if PAGE_SIZE_64KB
413 default "14" if PAGE_SIZE_64KB
414 range 12 64 if PAGE_SIZE_16KB
415 default "12" if PAGE_SIZE_16KB
419 The kernel memory allocator divides physically contiguous memory
420 blocks into "zones", where each zone is a power of two number of
421 pages. This option selects the largest power of two that the kernel
422 keeps in the memory allocator. If you need to allocate very large
423 blocks of physically contiguous memory, then you may need to
426 This config option is actually maximum order plus one. For example,
427 a value of 11 means that the largest free memory block is 2^10 pages.
429 The page size is not necessarily 4KB. Keep this in mind
430 when choosing a value for this option.
433 bool "Enable LoongArch DMW-based ioremap()"
435 We use generic TLB-based ioremap() by default since it has page
436 protection support. However, you can enable LoongArch DMW-based
437 ioremap() for better performance.
440 bool "Kexec system call"
443 kexec is a system call that implements the ability to shutdown your
444 current kernel, and to start another kernel. It is like a reboot
445 but it is independent of the system firmware. And like a reboot
446 you can start any kernel with it, not just Linux.
448 The name comes from the similarity to the exec system call.
451 bool "Build kdump crash kernel"
453 Generate crash dump after being started by kexec. This should
454 be normally only set in special crash dump kernels which are
455 loaded in the main kernel with kexec-tools into a specially
456 reserved region and then later executed after a crash by
459 For more details see Documentation/admin-guide/kdump/kdump.rst
461 config PHYSICAL_START
462 hex "Physical address where the kernel is loaded"
463 default "0x90000000a0000000"
464 depends on CRASH_DUMP
466 This gives the XKPRANGE address where the kernel is loaded.
467 If you plan to use kernel for capturing the crash dump change
468 this value to start of the reserved region (the "X" value as
469 specified in the "crashkernel=YM@XM" command line boot parameter
470 passed to the panic-ed kernel).
473 bool "Enable seccomp to safely compute untrusted bytecode"
477 This kernel feature is useful for number crunching applications
478 that may need to compute untrusted bytecode during their
479 execution. By using pipes or other transports made available to
480 the process as file descriptors supporting the read/write
481 syscalls, it's possible to isolate those applications in
482 their own address space using seccomp. Once seccomp is
483 enabled via /proc/<pid>/seccomp, it cannot be disabled
484 and the task is only allowed to execute a few safe syscalls
485 defined by each seccomp mode.
487 If unsure, say Y. Only embedded should say N here.
491 config ARCH_SELECT_MEMORY_MODEL
494 config ARCH_FLATMEM_ENABLE
498 config ARCH_SPARSEMEM_ENABLE
501 Say Y to support efficient handling of sparse physical memory,
502 for architectures which are either NUMA (Non-Uniform Memory Access)
503 or have huge holes in the physical address space for other reasons.
504 See <file:Documentation/mm/numa.rst> for more.
506 config ARCH_ENABLE_THP_MIGRATION
508 depends on TRANSPARENT_HUGEPAGE
510 config ARCH_MEMORY_PROBE
512 depends on MEMORY_HOTPLUG
518 config ARCH_MMAP_RND_BITS_MIN
521 config ARCH_MMAP_RND_BITS_MAX
524 menu "Power management options"
526 config ARCH_SUSPEND_POSSIBLE
529 config ARCH_HIBERNATION_POSSIBLE
532 source "kernel/power/Kconfig"
533 source "drivers/acpi/Kconfig"
537 source "drivers/firmware/Kconfig"