1 # SPDX-License-Identifier: GPL-2.0
5 select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
6 select ARCH_BINFMT_ELF_STATE
7 select ARCH_ENABLE_MEMORY_HOTPLUG
8 select ARCH_ENABLE_MEMORY_HOTREMOVE
9 select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
10 select ARCH_HAS_PHYS_TO_DMA
11 select ARCH_HAS_PTE_SPECIAL
12 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
13 select ARCH_INLINE_READ_LOCK if !PREEMPTION
14 select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION
15 select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION
16 select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION
17 select ARCH_INLINE_READ_UNLOCK if !PREEMPTION
18 select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION
19 select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION
20 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION
21 select ARCH_INLINE_WRITE_LOCK if !PREEMPTION
22 select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION
23 select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION
24 select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION
25 select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION
26 select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION
27 select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION
28 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION
29 select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION
30 select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION
31 select ARCH_INLINE_SPIN_LOCK if !PREEMPTION
32 select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION
33 select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION
34 select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION
35 select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION
36 select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION
37 select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION
38 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION
39 select ARCH_MIGHT_HAVE_PC_PARPORT
40 select ARCH_MIGHT_HAVE_PC_SERIO
41 select ARCH_SPARSEMEM_ENABLE
42 select ARCH_SUPPORTS_ACPI
43 select ARCH_SUPPORTS_ATOMIC_RMW
44 select ARCH_SUPPORTS_HUGETLBFS
45 select ARCH_SUPPORTS_NUMA_BALANCING
46 select ARCH_USE_BUILTIN_BSWAP
47 select ARCH_USE_CMPXCHG_LOCKREF
48 select ARCH_USE_QUEUED_RWLOCKS
49 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
50 select ARCH_WANTS_NO_INSTR
51 select BUILDTIME_TABLE_SORT
53 select GENERIC_CLOCKEVENTS
54 select GENERIC_CMOS_UPDATE
55 select GENERIC_CPU_AUTOPROBE
57 select GENERIC_GETTIMEOFDAY
58 select GENERIC_IRQ_MULTI_HANDLER
59 select GENERIC_IRQ_PROBE
60 select GENERIC_IRQ_SHOW
61 select GENERIC_LIB_ASHLDI3
62 select GENERIC_LIB_ASHRDI3
63 select GENERIC_LIB_CMPDI2
64 select GENERIC_LIB_LSHRDI3
65 select GENERIC_LIB_UCMPDI2
66 select GENERIC_PCI_IOMAP
67 select GENERIC_SCHED_CLOCK
68 select GENERIC_SMP_IDLE_THREAD
69 select GENERIC_TIME_VSYSCALL
71 select HAVE_ARCH_AUDITSYSCALL
72 select HAVE_ARCH_COMPILER_H
73 select HAVE_ARCH_MMAP_RND_BITS if MMU
74 select HAVE_ARCH_SECCOMP_FILTER
75 select HAVE_ARCH_TRACEHOOK
76 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
77 select HAVE_ASM_MODVERSIONS
78 select HAVE_CONTEXT_TRACKING
79 select HAVE_DEBUG_STACKOVERFLOW
80 select HAVE_DMA_CONTIGUOUS
81 select HAVE_EXIT_THREAD
83 select HAVE_GENERIC_VDSO
84 select HAVE_IOREMAP_PROT
85 select HAVE_IRQ_EXIT_ON_IRQ_STACK
86 select HAVE_IRQ_TIME_ACCOUNTING
87 select HAVE_MOD_ARCH_SPECIFIC
89 select HAVE_PERF_EVENTS
90 select HAVE_REGS_AND_STACK_ACCESS_API
92 select HAVE_SETUP_PER_CPU_AREA if NUMA
93 select HAVE_SYSCALL_TRACEPOINTS
95 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP
96 select IRQ_FORCED_THREADING
97 select IRQ_LOONGARCH_CPU
98 select MODULES_USE_ELF_RELA if MODULES
99 select NEED_PER_CPU_EMBED_FIRST_CHUNK
100 select NEED_PER_CPU_PAGE_FIRST_CHUNK
102 select OF_EARLY_FLATTREE
103 select PERF_USE_VMALLOC
106 select SYSCTL_EXCEPTION_TRACE
108 select TRACE_IRQFLAGS_SUPPORT
109 select USE_PERCPU_NUMA_NODE_ID
122 config CPU_HAS_PREFETCH
126 config GENERIC_CALIBRATE_DELAY
132 config GENERIC_HWEIGHT
135 config L1_CACHE_SHIFT
139 config LOCKDEP_SUPPORT
143 # MACH_LOONGSON32 and MACH_LOONGSON64 are delibrately carried over from the
144 # MIPS Loongson code, to preserve Loongson-specific code paths in drivers that
145 # are shared between architectures, and specifically expecting the symbols.
146 config MACH_LOONGSON32
149 config MACH_LOONGSON64
155 config PAGE_SIZE_16KB
158 config PAGE_SIZE_64KB
161 config PGTABLE_2LEVEL
164 config PGTABLE_3LEVEL
167 config PGTABLE_4LEVEL
170 config PGTABLE_LEVELS
172 default 2 if PGTABLE_2LEVEL
173 default 3 if PGTABLE_3LEVEL
174 default 4 if PGTABLE_4LEVEL
176 config SCHED_OMIT_FRAME_POINTER
180 menu "Kernel type and options"
182 source "kernel/Kconfig.hz"
185 prompt "Page Table Layout"
186 default 16KB_2LEVEL if 32BIT
187 default 16KB_3LEVEL if 64BIT
189 Allows choosing the page table layout, which is a combination
190 of page size and page table levels. The size of virtual memory
191 address space are determined by the page table layout.
194 bool "4KB with 3 levels"
196 select PGTABLE_3LEVEL
198 This option selects 4KB page size with 3 level page tables, which
199 support a maximum of 39 bits of application virtual memory.
202 bool "4KB with 4 levels"
204 select PGTABLE_4LEVEL
206 This option selects 4KB page size with 4 level page tables, which
207 support a maximum of 48 bits of application virtual memory.
210 bool "16KB with 2 levels"
211 select PAGE_SIZE_16KB
212 select PGTABLE_2LEVEL
214 This option selects 16KB page size with 2 level page tables, which
215 support a maximum of 36 bits of application virtual memory.
218 bool "16KB with 3 levels"
219 select PAGE_SIZE_16KB
220 select PGTABLE_3LEVEL
222 This option selects 16KB page size with 3 level page tables, which
223 support a maximum of 47 bits of application virtual memory.
226 bool "64KB with 2 levels"
227 select PAGE_SIZE_64KB
228 select PGTABLE_2LEVEL
230 This option selects 64KB page size with 2 level page tables, which
231 support a maximum of 42 bits of application virtual memory.
234 bool "64KB with 3 levels"
235 select PAGE_SIZE_64KB
236 select PGTABLE_3LEVEL
238 This option selects 64KB page size with 3 level page tables, which
239 support a maximum of 55 bits of application virtual memory.
244 string "Built-in kernel command line"
246 For most platforms, the arguments for the kernel's command line
247 are provided at run-time, during boot. However, there are cases
248 where either no arguments are being provided or the provided
249 arguments are insufficient or even invalid.
251 When that occurs, it is possible to define a built-in command
252 line here and choose how the kernel should use it later on.
255 prompt "Kernel command line type"
256 default CMDLINE_BOOTLOADER
258 Choose how the kernel will handle the provided built-in command
261 config CMDLINE_BOOTLOADER
262 bool "Use bootloader kernel arguments if available"
264 Prefer the command-line passed by the boot loader if available.
265 Use the built-in command line as fallback in case we get nothing
266 during boot. This is the default behaviour.
268 config CMDLINE_EXTEND
269 bool "Use built-in to extend bootloader kernel arguments"
271 The command-line arguments provided during boot will be
272 appended to the built-in command line. This is useful in
273 cases where the provided arguments are insufficient and
274 you don't want to or cannot modify them.
277 bool "Always use the built-in kernel command string"
279 Always use the built-in command line, even if we get one during
280 boot. This is useful in case you need to override the provided
281 command line on systems where you don't have or want control
287 bool "Enable DMI scanning"
288 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
291 This enables SMBIOS/DMI feature for systems, and scanning of
292 DMI to identify machine quirks.
295 bool "EFI runtime service support"
297 select EFI_PARAMS_FROM_FDT
298 select EFI_RUNTIME_WRAPPERS
300 This enables the kernel to use EFI runtime services that are
301 available (such as the EFI variable services).
304 bool "Multi-Processing support"
306 This enables support for systems with more than one CPU. If you have
307 a system with only one CPU, say N. If you have a system with more
310 If you say N here, the kernel will run on uni- and multiprocessor
311 machines, but will use only one CPU of a multiprocessor machine. If
312 you say Y here, the kernel will run on many, but not all,
313 uniprocessor machines. On a uniprocessor machine, the kernel
314 will run faster if you say N here.
316 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>.
318 If you don't know what to do here, say N.
321 bool "Support for hot-pluggable CPUs"
323 select GENERIC_IRQ_MIGRATION
325 Say Y here to allow turning CPUs off and on. CPUs can be
326 controlled through /sys/devices/system/cpu.
327 (Note: power management support will enable this option
328 automatically on SMP systems. )
329 Say N if you want to disable CPU hotplug.
332 int "Maximum number of CPUs (2-256)"
337 This allows you to specify the maximum number of CPUs which this
343 select ACPI_NUMA if ACPI
345 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access)
346 support. This option improves performance on systems with more
347 than one NUMA node; on single node systems it is generally better
348 to leave it disabled.
355 config FORCE_MAX_ZONEORDER
356 int "Maximum zone order"
357 range 14 64 if PAGE_SIZE_64KB
358 default "14" if PAGE_SIZE_64KB
359 range 12 64 if PAGE_SIZE_16KB
360 default "12" if PAGE_SIZE_16KB
364 The kernel memory allocator divides physically contiguous memory
365 blocks into "zones", where each zone is a power of two number of
366 pages. This option selects the largest power of two that the kernel
367 keeps in the memory allocator. If you need to allocate very large
368 blocks of physically contiguous memory, then you may need to
371 This config option is actually maximum order plus one. For example,
372 a value of 11 means that the largest free memory block is 2^10 pages.
374 The page size is not necessarily 4KB. Keep this in mind
375 when choosing a value for this option.
378 bool "Enable seccomp to safely compute untrusted bytecode"
382 This kernel feature is useful for number crunching applications
383 that may need to compute untrusted bytecode during their
384 execution. By using pipes or other transports made available to
385 the process as file descriptors supporting the read/write
386 syscalls, it's possible to isolate those applications in
387 their own address space using seccomp. Once seccomp is
388 enabled via /proc/<pid>/seccomp, it cannot be disabled
389 and the task is only allowed to execute a few safe syscalls
390 defined by each seccomp mode.
392 If unsure, say Y. Only embedded should say N here.
396 config ARCH_SELECT_MEMORY_MODEL
399 config ARCH_FLATMEM_ENABLE
403 config ARCH_SPARSEMEM_ENABLE
406 Say Y to support efficient handling of sparse physical memory,
407 for architectures which are either NUMA (Non-Uniform Memory Access)
408 or have huge holes in the physical address space for other reasons.
409 See <file:Documentation/vm/numa.rst> for more.
411 config ARCH_ENABLE_THP_MIGRATION
413 depends on TRANSPARENT_HUGEPAGE
415 config ARCH_MEMORY_PROBE
417 depends on MEMORY_HOTPLUG
423 config ARCH_MMAP_RND_BITS_MIN
426 config ARCH_MMAP_RND_BITS_MAX
429 menu "Power management options"
431 source "drivers/acpi/Kconfig"
435 source "drivers/firmware/Kconfig"