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_PHYS_TO_DMA
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_MIGHT_HAVE_PC_PARPORT
43 select ARCH_MIGHT_HAVE_PC_SERIO
44 select ARCH_SPARSEMEM_ENABLE
45 select ARCH_SUPPORTS_ACPI
46 select ARCH_SUPPORTS_ATOMIC_RMW
47 select ARCH_SUPPORTS_HUGETLBFS
48 select ARCH_SUPPORTS_NUMA_BALANCING
49 select ARCH_USE_BUILTIN_BSWAP
50 select ARCH_USE_CMPXCHG_LOCKREF
51 select ARCH_USE_QUEUED_RWLOCKS
52 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
53 select ARCH_WANTS_NO_INSTR
54 select BUILDTIME_TABLE_SORT
57 select GENERIC_CLOCKEVENTS
58 select GENERIC_CMOS_UPDATE
59 select GENERIC_CPU_AUTOPROBE
61 select GENERIC_GETTIMEOFDAY
62 select GENERIC_IRQ_MULTI_HANDLER
63 select GENERIC_IRQ_PROBE
64 select GENERIC_IRQ_SHOW
65 select GENERIC_LIB_ASHLDI3
66 select GENERIC_LIB_ASHRDI3
67 select GENERIC_LIB_CMPDI2
68 select GENERIC_LIB_LSHRDI3
69 select GENERIC_LIB_UCMPDI2
70 select GENERIC_PCI_IOMAP
71 select GENERIC_SCHED_CLOCK
72 select GENERIC_SMP_IDLE_THREAD
73 select GENERIC_TIME_VSYSCALL
75 select HAVE_ARCH_AUDITSYSCALL
76 select HAVE_ARCH_MMAP_RND_BITS if MMU
77 select HAVE_ARCH_SECCOMP_FILTER
78 select HAVE_ARCH_TRACEHOOK
79 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
80 select HAVE_ASM_MODVERSIONS
81 select HAVE_CONTEXT_TRACKING
82 select HAVE_DEBUG_STACKOVERFLOW
83 select HAVE_DMA_CONTIGUOUS
84 select HAVE_EXIT_THREAD
86 select HAVE_GENERIC_VDSO
87 select HAVE_IOREMAP_PROT
88 select HAVE_IRQ_EXIT_ON_IRQ_STACK
89 select HAVE_IRQ_TIME_ACCOUNTING
90 select HAVE_MOD_ARCH_SPECIFIC
93 select HAVE_PERF_EVENTS
94 select HAVE_REGS_AND_STACK_ACCESS_API
96 select HAVE_SETUP_PER_CPU_AREA if NUMA
97 select HAVE_SYSCALL_TRACEPOINTS
99 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP
100 select IRQ_FORCED_THREADING
101 select IRQ_LOONGARCH_CPU
102 select MMU_GATHER_MERGE_VMAS if MMU
103 select MODULES_USE_ELF_RELA if MODULES
104 select NEED_PER_CPU_EMBED_FIRST_CHUNK
105 select NEED_PER_CPU_PAGE_FIRST_CHUNK
107 select OF_EARLY_FLATTREE
109 select PCI_DOMAINS_GENERIC
110 select PCI_ECAM if ACPI
112 select PCI_MSI_ARCH_FALLBACKS
113 select PERF_USE_VMALLOC
117 select SYSCTL_EXCEPTION_TRACE
119 select TRACE_IRQFLAGS_SUPPORT
120 select USE_PERCPU_NUMA_NODE_ID
133 config CPU_HAS_PREFETCH
137 config GENERIC_CALIBRATE_DELAY
143 config GENERIC_HWEIGHT
146 config L1_CACHE_SHIFT
150 config LOCKDEP_SUPPORT
154 # MACH_LOONGSON32 and MACH_LOONGSON64 are delibrately carried over from the
155 # MIPS Loongson code, to preserve Loongson-specific code paths in drivers that
156 # are shared between architectures, and specifically expecting the symbols.
157 config MACH_LOONGSON32
160 config MACH_LOONGSON64
166 config PAGE_SIZE_16KB
169 config PAGE_SIZE_64KB
172 config PGTABLE_2LEVEL
175 config PGTABLE_3LEVEL
178 config PGTABLE_4LEVEL
181 config PGTABLE_LEVELS
183 default 2 if PGTABLE_2LEVEL
184 default 3 if PGTABLE_3LEVEL
185 default 4 if PGTABLE_4LEVEL
187 config SCHED_OMIT_FRAME_POINTER
191 menu "Kernel type and options"
193 source "kernel/Kconfig.hz"
196 prompt "Page Table Layout"
197 default 16KB_2LEVEL if 32BIT
198 default 16KB_3LEVEL if 64BIT
200 Allows choosing the page table layout, which is a combination
201 of page size and page table levels. The size of virtual memory
202 address space are determined by the page table layout.
205 bool "4KB with 3 levels"
207 select PGTABLE_3LEVEL
209 This option selects 4KB page size with 3 level page tables, which
210 support a maximum of 39 bits of application virtual memory.
213 bool "4KB with 4 levels"
215 select PGTABLE_4LEVEL
217 This option selects 4KB page size with 4 level page tables, which
218 support a maximum of 48 bits of application virtual memory.
221 bool "16KB with 2 levels"
222 select PAGE_SIZE_16KB
223 select PGTABLE_2LEVEL
225 This option selects 16KB page size with 2 level page tables, which
226 support a maximum of 36 bits of application virtual memory.
229 bool "16KB with 3 levels"
230 select PAGE_SIZE_16KB
231 select PGTABLE_3LEVEL
233 This option selects 16KB page size with 3 level page tables, which
234 support a maximum of 47 bits of application virtual memory.
237 bool "64KB with 2 levels"
238 select PAGE_SIZE_64KB
239 select PGTABLE_2LEVEL
241 This option selects 64KB page size with 2 level page tables, which
242 support a maximum of 42 bits of application virtual memory.
245 bool "64KB with 3 levels"
246 select PAGE_SIZE_64KB
247 select PGTABLE_3LEVEL
249 This option selects 64KB page size with 3 level page tables, which
250 support a maximum of 55 bits of application virtual memory.
255 string "Built-in kernel command line"
257 For most platforms, the arguments for the kernel's command line
258 are provided at run-time, during boot. However, there are cases
259 where either no arguments are being provided or the provided
260 arguments are insufficient or even invalid.
262 When that occurs, it is possible to define a built-in command
263 line here and choose how the kernel should use it later on.
266 prompt "Kernel command line type"
267 default CMDLINE_BOOTLOADER
269 Choose how the kernel will handle the provided built-in command
272 config CMDLINE_BOOTLOADER
273 bool "Use bootloader kernel arguments if available"
275 Prefer the command-line passed by the boot loader if available.
276 Use the built-in command line as fallback in case we get nothing
277 during boot. This is the default behaviour.
279 config CMDLINE_EXTEND
280 bool "Use built-in to extend bootloader kernel arguments"
282 The command-line arguments provided during boot will be
283 appended to the built-in command line. This is useful in
284 cases where the provided arguments are insufficient and
285 you don't want to or cannot modify them.
288 bool "Always use the built-in kernel command string"
290 Always use the built-in command line, even if we get one during
291 boot. This is useful in case you need to override the provided
292 command line on systems where you don't have or want control
298 bool "Enable DMI scanning"
299 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
302 This enables SMBIOS/DMI feature for systems, and scanning of
303 DMI to identify machine quirks.
306 bool "EFI runtime service support"
308 select EFI_PARAMS_FROM_FDT
309 select EFI_RUNTIME_WRAPPERS
311 This enables the kernel to use EFI runtime services that are
312 available (such as the EFI variable services).
315 bool "Multi-Processing support"
317 This enables support for systems with more than one CPU. If you have
318 a system with only one CPU, say N. If you have a system with more
321 If you say N here, the kernel will run on uni- and multiprocessor
322 machines, but will use only one CPU of a multiprocessor machine. If
323 you say Y here, the kernel will run on many, but not all,
324 uniprocessor machines. On a uniprocessor machine, the kernel
325 will run faster if you say N here.
327 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>.
329 If you don't know what to do here, say N.
332 bool "Support for hot-pluggable CPUs"
334 select GENERIC_IRQ_MIGRATION
336 Say Y here to allow turning CPUs off and on. CPUs can be
337 controlled through /sys/devices/system/cpu.
338 (Note: power management support will enable this option
339 automatically on SMP systems. )
340 Say N if you want to disable CPU hotplug.
343 int "Maximum number of CPUs (2-256)"
348 This allows you to specify the maximum number of CPUs which this
354 select ACPI_NUMA if ACPI
356 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access)
357 support. This option improves performance on systems with more
358 than one NUMA node; on single node systems it is generally better
359 to leave it disabled.
366 config FORCE_MAX_ZONEORDER
367 int "Maximum zone order"
368 range 14 64 if PAGE_SIZE_64KB
369 default "14" if PAGE_SIZE_64KB
370 range 12 64 if PAGE_SIZE_16KB
371 default "12" if PAGE_SIZE_16KB
375 The kernel memory allocator divides physically contiguous memory
376 blocks into "zones", where each zone is a power of two number of
377 pages. This option selects the largest power of two that the kernel
378 keeps in the memory allocator. If you need to allocate very large
379 blocks of physically contiguous memory, then you may need to
382 This config option is actually maximum order plus one. For example,
383 a value of 11 means that the largest free memory block is 2^10 pages.
385 The page size is not necessarily 4KB. Keep this in mind
386 when choosing a value for this option.
389 bool "Enable seccomp to safely compute untrusted bytecode"
393 This kernel feature is useful for number crunching applications
394 that may need to compute untrusted bytecode during their
395 execution. By using pipes or other transports made available to
396 the process as file descriptors supporting the read/write
397 syscalls, it's possible to isolate those applications in
398 their own address space using seccomp. Once seccomp is
399 enabled via /proc/<pid>/seccomp, it cannot be disabled
400 and the task is only allowed to execute a few safe syscalls
401 defined by each seccomp mode.
403 If unsure, say Y. Only embedded should say N here.
407 config ARCH_SELECT_MEMORY_MODEL
410 config ARCH_FLATMEM_ENABLE
414 config ARCH_SPARSEMEM_ENABLE
417 Say Y to support efficient handling of sparse physical memory,
418 for architectures which are either NUMA (Non-Uniform Memory Access)
419 or have huge holes in the physical address space for other reasons.
420 See <file:Documentation/vm/numa.rst> for more.
422 config ARCH_ENABLE_THP_MIGRATION
424 depends on TRANSPARENT_HUGEPAGE
426 config ARCH_MEMORY_PROBE
428 depends on MEMORY_HOTPLUG
434 config ARCH_MMAP_RND_BITS_MIN
437 config ARCH_MMAP_RND_BITS_MAX
440 menu "Power management options"
442 source "drivers/acpi/Kconfig"
446 source "drivers/firmware/Kconfig"