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_NMI_SAFE_THIS_CPU_OPS
14 select ARCH_HAS_PTE_SPECIAL
15 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
16 select ARCH_INLINE_READ_LOCK if !PREEMPTION
17 select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION
18 select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION
19 select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION
20 select ARCH_INLINE_READ_UNLOCK if !PREEMPTION
21 select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION
22 select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION
23 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION
24 select ARCH_INLINE_WRITE_LOCK if !PREEMPTION
25 select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION
26 select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION
27 select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION
28 select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION
29 select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION
30 select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION
31 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION
32 select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION
33 select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION
34 select ARCH_INLINE_SPIN_LOCK if !PREEMPTION
35 select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION
36 select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION
37 select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION
38 select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION
39 select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION
40 select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION
41 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION
42 select ARCH_KEEP_MEMBLOCK
43 select ARCH_MIGHT_HAVE_PC_PARPORT
44 select ARCH_MIGHT_HAVE_PC_SERIO
45 select ARCH_SPARSEMEM_ENABLE
47 select ARCH_SUPPORTS_ACPI
48 select ARCH_SUPPORTS_ATOMIC_RMW
49 select ARCH_SUPPORTS_HUGETLBFS
50 select ARCH_SUPPORTS_NUMA_BALANCING
51 select ARCH_USE_BUILTIN_BSWAP
52 select ARCH_USE_CMPXCHG_LOCKREF
53 select ARCH_USE_QUEUED_RWLOCKS
54 select ARCH_USE_QUEUED_SPINLOCKS
55 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
56 select ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
57 select ARCH_WANT_LD_ORPHAN_WARN
58 select ARCH_WANTS_NO_INSTR
59 select BUILDTIME_TABLE_SORT
63 select GENERIC_CLOCKEVENTS
64 select GENERIC_CMOS_UPDATE
65 select GENERIC_CPU_AUTOPROBE
67 select GENERIC_GETTIMEOFDAY
68 select GENERIC_IOREMAP if !ARCH_IOREMAP
69 select GENERIC_IRQ_MULTI_HANDLER
70 select GENERIC_IRQ_PROBE
71 select GENERIC_IRQ_SHOW
72 select GENERIC_LIB_ASHLDI3
73 select GENERIC_LIB_ASHRDI3
74 select GENERIC_LIB_CMPDI2
75 select GENERIC_LIB_LSHRDI3
76 select GENERIC_LIB_UCMPDI2
77 select GENERIC_LIB_DEVMEM_IS_ALLOWED
78 select GENERIC_PCI_IOMAP
79 select GENERIC_SCHED_CLOCK
80 select GENERIC_SMP_IDLE_THREAD
81 select GENERIC_TIME_VSYSCALL
83 select HAVE_ARCH_AUDITSYSCALL
84 select HAVE_ARCH_MMAP_RND_BITS if MMU
85 select HAVE_ARCH_SECCOMP_FILTER
86 select HAVE_ARCH_TRACEHOOK
87 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
88 select HAVE_ASM_MODVERSIONS
89 select HAVE_CONTEXT_TRACKING_USER
90 select HAVE_C_RECORDMCOUNT
91 select HAVE_DEBUG_STACKOVERFLOW
92 select HAVE_DMA_CONTIGUOUS
93 select HAVE_DYNAMIC_FTRACE
94 select HAVE_DYNAMIC_FTRACE_WITH_ARGS
95 select HAVE_DYNAMIC_FTRACE_WITH_REGS
97 select HAVE_EXIT_THREAD
99 select HAVE_FTRACE_MCOUNT_RECORD
100 select HAVE_FUNCTION_GRAPH_TRACER
101 select HAVE_FUNCTION_TRACER
102 select HAVE_GENERIC_VDSO
103 select HAVE_IOREMAP_PROT
104 select HAVE_IRQ_EXIT_ON_IRQ_STACK
105 select HAVE_IRQ_TIME_ACCOUNTING
106 select HAVE_MOD_ARCH_SPECIFIC
109 select HAVE_PERF_EVENTS
110 select HAVE_PERF_REGS
111 select HAVE_PERF_USER_STACK_DUMP
112 select HAVE_REGS_AND_STACK_ACCESS_API
114 select HAVE_SETUP_PER_CPU_AREA if NUMA
115 select HAVE_STACKPROTECTOR
116 select HAVE_SYSCALL_TRACEPOINTS
118 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP
119 select IRQ_FORCED_THREADING
120 select IRQ_LOONGARCH_CPU
121 select MMU_GATHER_MERGE_VMAS if MMU
122 select MODULES_USE_ELF_RELA if MODULES
123 select NEED_PER_CPU_EMBED_FIRST_CHUNK
124 select NEED_PER_CPU_PAGE_FIRST_CHUNK
126 select OF_EARLY_FLATTREE
128 select PCI_DOMAINS_GENERIC
129 select PCI_ECAM if ACPI
131 select PCI_MSI_ARCH_FALLBACKS
133 select PERF_USE_VMALLOC
137 select SYSCTL_ARCH_UNALIGN_ALLOW
138 select SYSCTL_ARCH_UNALIGN_NO_WARN
139 select SYSCTL_EXCEPTION_TRACE
141 select TRACE_IRQFLAGS_SUPPORT
142 select USE_PERCPU_NUMA_NODE_ID
143 select USER_STACKTRACE_SUPPORT
156 config CPU_HAS_PREFETCH
164 config GENERIC_BUG_RELATIVE_POINTERS
166 depends on GENERIC_BUG
168 config GENERIC_CALIBRATE_DELAY
174 config GENERIC_HWEIGHT
177 config L1_CACHE_SHIFT
181 config LOCKDEP_SUPPORT
185 config STACKTRACE_SUPPORT
189 # MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the
190 # MIPS Loongson code, to preserve Loongson-specific code paths in drivers that
191 # are shared between architectures, and specifically expecting the symbols.
192 config MACH_LOONGSON32
195 config MACH_LOONGSON64
198 config FIX_EARLYCON_MEM
204 config PAGE_SIZE_16KB
207 config PAGE_SIZE_64KB
210 config PGTABLE_2LEVEL
213 config PGTABLE_3LEVEL
216 config PGTABLE_4LEVEL
219 config PGTABLE_LEVELS
221 default 2 if PGTABLE_2LEVEL
222 default 3 if PGTABLE_3LEVEL
223 default 4 if PGTABLE_4LEVEL
225 config SCHED_OMIT_FRAME_POINTER
229 config AS_HAS_EXPLICIT_RELOCS
230 def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x))
232 menu "Kernel type and options"
234 source "kernel/Kconfig.hz"
237 prompt "Page Table Layout"
238 default 16KB_2LEVEL if 32BIT
239 default 16KB_3LEVEL if 64BIT
241 Allows choosing the page table layout, which is a combination
242 of page size and page table levels. The size of virtual memory
243 address space are determined by the page table layout.
246 bool "4KB with 3 levels"
248 select PGTABLE_3LEVEL
250 This option selects 4KB page size with 3 level page tables, which
251 support a maximum of 39 bits of application virtual memory.
254 bool "4KB with 4 levels"
256 select PGTABLE_4LEVEL
258 This option selects 4KB page size with 4 level page tables, which
259 support a maximum of 48 bits of application virtual memory.
262 bool "16KB with 2 levels"
263 select PAGE_SIZE_16KB
264 select PGTABLE_2LEVEL
266 This option selects 16KB page size with 2 level page tables, which
267 support a maximum of 36 bits of application virtual memory.
270 bool "16KB with 3 levels"
271 select PAGE_SIZE_16KB
272 select PGTABLE_3LEVEL
274 This option selects 16KB page size with 3 level page tables, which
275 support a maximum of 47 bits of application virtual memory.
278 bool "64KB with 2 levels"
279 select PAGE_SIZE_64KB
280 select PGTABLE_2LEVEL
282 This option selects 64KB page size with 2 level page tables, which
283 support a maximum of 42 bits of application virtual memory.
286 bool "64KB with 3 levels"
287 select PAGE_SIZE_64KB
288 select PGTABLE_3LEVEL
290 This option selects 64KB page size with 3 level page tables, which
291 support a maximum of 55 bits of application virtual memory.
296 string "Built-in kernel command line"
298 For most platforms, the arguments for the kernel's command line
299 are provided at run-time, during boot. However, there are cases
300 where either no arguments are being provided or the provided
301 arguments are insufficient or even invalid.
303 When that occurs, it is possible to define a built-in command
304 line here and choose how the kernel should use it later on.
307 prompt "Kernel command line type"
308 default CMDLINE_BOOTLOADER
310 Choose how the kernel will handle the provided built-in command
313 config CMDLINE_BOOTLOADER
314 bool "Use bootloader kernel arguments if available"
316 Prefer the command-line passed by the boot loader if available.
317 Use the built-in command line as fallback in case we get nothing
318 during boot. This is the default behaviour.
320 config CMDLINE_EXTEND
321 bool "Use built-in to extend bootloader kernel arguments"
323 The command-line arguments provided during boot will be
324 appended to the built-in command line. This is useful in
325 cases where the provided arguments are insufficient and
326 you don't want to or cannot modify them.
329 bool "Always use the built-in kernel command string"
331 Always use the built-in command line, even if we get one during
332 boot. This is useful in case you need to override the provided
333 command line on systems where you don't have or want control
339 bool "Enable DMI scanning"
340 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
343 This enables SMBIOS/DMI feature for systems, and scanning of
344 DMI to identify machine quirks.
347 bool "EFI runtime service support"
349 select EFI_RUNTIME_WRAPPERS
351 This enables the kernel to use EFI runtime services that are
352 available (such as the EFI variable services).
355 bool "EFI boot stub support"
358 select EFI_GENERIC_STUB
360 This kernel feature allows the kernel to be loaded directly by
361 EFI firmware without the use of a bootloader.
364 bool "Multi-Processing support"
366 This enables support for systems with more than one CPU. If you have
367 a system with only one CPU, say N. If you have a system with more
370 If you say N here, the kernel will run on uni- and multiprocessor
371 machines, but will use only one CPU of a multiprocessor machine. If
372 you say Y here, the kernel will run on many, but not all,
373 uniprocessor machines. On a uniprocessor machine, the kernel
374 will run faster if you say N here.
376 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>.
378 If you don't know what to do here, say N.
381 bool "Support for hot-pluggable CPUs"
383 select GENERIC_IRQ_MIGRATION
385 Say Y here to allow turning CPUs off and on. CPUs can be
386 controlled through /sys/devices/system/cpu.
387 (Note: power management support will enable this option
388 automatically on SMP systems. )
389 Say N if you want to disable CPU hotplug.
392 int "Maximum number of CPUs (2-256)"
397 This allows you to specify the maximum number of CPUs which this
403 select ACPI_NUMA if ACPI
405 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access)
406 support. This option improves performance on systems with more
407 than one NUMA node; on single node systems it is generally better
408 to leave it disabled.
415 config ARCH_FORCE_MAX_ORDER
416 int "Maximum zone order"
417 range 14 64 if PAGE_SIZE_64KB
418 default "14" if PAGE_SIZE_64KB
419 range 12 64 if PAGE_SIZE_16KB
420 default "12" if PAGE_SIZE_16KB
424 The kernel memory allocator divides physically contiguous memory
425 blocks into "zones", where each zone is a power of two number of
426 pages. This option selects the largest power of two that the kernel
427 keeps in the memory allocator. If you need to allocate very large
428 blocks of physically contiguous memory, then you may need to
431 This config option is actually maximum order plus one. For example,
432 a value of 11 means that the largest free memory block is 2^10 pages.
434 The page size is not necessarily 4KB. Keep this in mind
435 when choosing a value for this option.
438 bool "Enable LoongArch DMW-based ioremap()"
440 We use generic TLB-based ioremap() by default since it has page
441 protection support. However, you can enable LoongArch DMW-based
442 ioremap() for better performance.
445 bool "Kexec system call"
448 kexec is a system call that implements the ability to shutdown your
449 current kernel, and to start another kernel. It is like a reboot
450 but it is independent of the system firmware. And like a reboot
451 you can start any kernel with it, not just Linux.
453 The name comes from the similarity to the exec system call.
456 bool "Build kdump crash kernel"
458 Generate crash dump after being started by kexec. This should
459 be normally only set in special crash dump kernels which are
460 loaded in the main kernel with kexec-tools into a specially
461 reserved region and then later executed after a crash by
464 For more details see Documentation/admin-guide/kdump/kdump.rst
466 config PHYSICAL_START
467 hex "Physical address where the kernel is loaded"
468 default "0x90000000a0000000"
469 depends on CRASH_DUMP
471 This gives the XKPRANGE address where the kernel is loaded.
472 If you plan to use kernel for capturing the crash dump change
473 this value to start of the reserved region (the "X" value as
474 specified in the "crashkernel=YM@XM" command line boot parameter
475 passed to the panic-ed kernel).
478 bool "Enable seccomp to safely compute untrusted bytecode"
482 This kernel feature is useful for number crunching applications
483 that may need to compute untrusted bytecode during their
484 execution. By using pipes or other transports made available to
485 the process as file descriptors supporting the read/write
486 syscalls, it's possible to isolate those applications in
487 their own address space using seccomp. Once seccomp is
488 enabled via /proc/<pid>/seccomp, it cannot be disabled
489 and the task is only allowed to execute a few safe syscalls
490 defined by each seccomp mode.
492 If unsure, say Y. Only embedded should say N here.
496 config ARCH_SELECT_MEMORY_MODEL
499 config ARCH_FLATMEM_ENABLE
503 config ARCH_SPARSEMEM_ENABLE
505 select SPARSEMEM_VMEMMAP_ENABLE
507 Say Y to support efficient handling of sparse physical memory,
508 for architectures which are either NUMA (Non-Uniform Memory Access)
509 or have huge holes in the physical address space for other reasons.
510 See <file:Documentation/mm/numa.rst> for more.
512 config ARCH_ENABLE_THP_MIGRATION
514 depends on TRANSPARENT_HUGEPAGE
516 config ARCH_MEMORY_PROBE
518 depends on MEMORY_HOTPLUG
524 config ARCH_MMAP_RND_BITS_MIN
527 config ARCH_MMAP_RND_BITS_MAX
530 menu "Power management options"
532 config ARCH_SUSPEND_POSSIBLE
535 config ARCH_HIBERNATION_POSSIBLE
538 source "kernel/power/Kconfig"
539 source "drivers/acpi/Kconfig"
543 source "drivers/firmware/Kconfig"