1 # SPDX-License-Identifier: GPL-2.0
5 select ACPI_GENERIC_GSI if ACPI
6 select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
7 select ARCH_BINFMT_ELF_STATE
8 select ARCH_ENABLE_MEMORY_HOTPLUG
9 select ARCH_ENABLE_MEMORY_HOTREMOVE
10 select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
11 select ARCH_HAS_PHYS_TO_DMA
12 select ARCH_HAS_PTE_SPECIAL
13 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
14 select ARCH_INLINE_READ_LOCK if !PREEMPTION
15 select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION
16 select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION
17 select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION
18 select ARCH_INLINE_READ_UNLOCK if !PREEMPTION
19 select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION
20 select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION
21 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION
22 select ARCH_INLINE_WRITE_LOCK if !PREEMPTION
23 select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION
24 select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION
25 select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION
26 select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION
27 select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION
28 select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION
29 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION
30 select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION
31 select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION
32 select ARCH_INLINE_SPIN_LOCK if !PREEMPTION
33 select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION
34 select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION
35 select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION
36 select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION
37 select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION
38 select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION
39 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION
40 select ARCH_MIGHT_HAVE_PC_PARPORT
41 select ARCH_MIGHT_HAVE_PC_SERIO
42 select ARCH_SPARSEMEM_ENABLE
43 select ARCH_SUPPORTS_ACPI
44 select ARCH_SUPPORTS_ATOMIC_RMW
45 select ARCH_SUPPORTS_HUGETLBFS
46 select ARCH_SUPPORTS_NUMA_BALANCING
47 select ARCH_USE_BUILTIN_BSWAP
48 select ARCH_USE_CMPXCHG_LOCKREF
49 select ARCH_USE_QUEUED_RWLOCKS
50 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
51 select ARCH_WANTS_NO_INSTR
52 select BUILDTIME_TABLE_SORT
54 select GENERIC_CLOCKEVENTS
55 select GENERIC_CMOS_UPDATE
56 select GENERIC_CPU_AUTOPROBE
58 select GENERIC_GETTIMEOFDAY
59 select GENERIC_IRQ_MULTI_HANDLER
60 select GENERIC_IRQ_PROBE
61 select GENERIC_IRQ_SHOW
62 select GENERIC_LIB_ASHLDI3
63 select GENERIC_LIB_ASHRDI3
64 select GENERIC_LIB_CMPDI2
65 select GENERIC_LIB_LSHRDI3
66 select GENERIC_LIB_UCMPDI2
67 select GENERIC_PCI_IOMAP
68 select GENERIC_SCHED_CLOCK
69 select GENERIC_SMP_IDLE_THREAD
70 select GENERIC_TIME_VSYSCALL
72 select HAVE_ARCH_AUDITSYSCALL
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
111 select MMU_GATHER_MERGE_VMAS if MMU
123 config CPU_HAS_PREFETCH
127 config GENERIC_CALIBRATE_DELAY
133 config GENERIC_HWEIGHT
136 config L1_CACHE_SHIFT
140 config LOCKDEP_SUPPORT
144 # MACH_LOONGSON32 and MACH_LOONGSON64 are delibrately carried over from the
145 # MIPS Loongson code, to preserve Loongson-specific code paths in drivers that
146 # are shared between architectures, and specifically expecting the symbols.
147 config MACH_LOONGSON32
150 config MACH_LOONGSON64
156 config PAGE_SIZE_16KB
159 config PAGE_SIZE_64KB
162 config PGTABLE_2LEVEL
165 config PGTABLE_3LEVEL
168 config PGTABLE_4LEVEL
171 config PGTABLE_LEVELS
173 default 2 if PGTABLE_2LEVEL
174 default 3 if PGTABLE_3LEVEL
175 default 4 if PGTABLE_4LEVEL
177 config SCHED_OMIT_FRAME_POINTER
181 menu "Kernel type and options"
183 source "kernel/Kconfig.hz"
186 prompt "Page Table Layout"
187 default 16KB_2LEVEL if 32BIT
188 default 16KB_3LEVEL if 64BIT
190 Allows choosing the page table layout, which is a combination
191 of page size and page table levels. The size of virtual memory
192 address space are determined by the page table layout.
195 bool "4KB with 3 levels"
197 select PGTABLE_3LEVEL
199 This option selects 4KB page size with 3 level page tables, which
200 support a maximum of 39 bits of application virtual memory.
203 bool "4KB with 4 levels"
205 select PGTABLE_4LEVEL
207 This option selects 4KB page size with 4 level page tables, which
208 support a maximum of 48 bits of application virtual memory.
211 bool "16KB with 2 levels"
212 select PAGE_SIZE_16KB
213 select PGTABLE_2LEVEL
215 This option selects 16KB page size with 2 level page tables, which
216 support a maximum of 36 bits of application virtual memory.
219 bool "16KB with 3 levels"
220 select PAGE_SIZE_16KB
221 select PGTABLE_3LEVEL
223 This option selects 16KB page size with 3 level page tables, which
224 support a maximum of 47 bits of application virtual memory.
227 bool "64KB with 2 levels"
228 select PAGE_SIZE_64KB
229 select PGTABLE_2LEVEL
231 This option selects 64KB page size with 2 level page tables, which
232 support a maximum of 42 bits of application virtual memory.
235 bool "64KB with 3 levels"
236 select PAGE_SIZE_64KB
237 select PGTABLE_3LEVEL
239 This option selects 64KB page size with 3 level page tables, which
240 support a maximum of 55 bits of application virtual memory.
245 string "Built-in kernel command line"
247 For most platforms, the arguments for the kernel's command line
248 are provided at run-time, during boot. However, there are cases
249 where either no arguments are being provided or the provided
250 arguments are insufficient or even invalid.
252 When that occurs, it is possible to define a built-in command
253 line here and choose how the kernel should use it later on.
256 prompt "Kernel command line type"
257 default CMDLINE_BOOTLOADER
259 Choose how the kernel will handle the provided built-in command
262 config CMDLINE_BOOTLOADER
263 bool "Use bootloader kernel arguments if available"
265 Prefer the command-line passed by the boot loader if available.
266 Use the built-in command line as fallback in case we get nothing
267 during boot. This is the default behaviour.
269 config CMDLINE_EXTEND
270 bool "Use built-in to extend bootloader kernel arguments"
272 The command-line arguments provided during boot will be
273 appended to the built-in command line. This is useful in
274 cases where the provided arguments are insufficient and
275 you don't want to or cannot modify them.
278 bool "Always use the built-in kernel command string"
280 Always use the built-in command line, even if we get one during
281 boot. This is useful in case you need to override the provided
282 command line on systems where you don't have or want control
288 bool "Enable DMI scanning"
289 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
292 This enables SMBIOS/DMI feature for systems, and scanning of
293 DMI to identify machine quirks.
296 bool "EFI runtime service support"
298 select EFI_PARAMS_FROM_FDT
299 select EFI_RUNTIME_WRAPPERS
301 This enables the kernel to use EFI runtime services that are
302 available (such as the EFI variable services).
305 bool "Multi-Processing support"
307 This enables support for systems with more than one CPU. If you have
308 a system with only one CPU, say N. If you have a system with more
311 If you say N here, the kernel will run on uni- and multiprocessor
312 machines, but will use only one CPU of a multiprocessor machine. If
313 you say Y here, the kernel will run on many, but not all,
314 uniprocessor machines. On a uniprocessor machine, the kernel
315 will run faster if you say N here.
317 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>.
319 If you don't know what to do here, say N.
322 bool "Support for hot-pluggable CPUs"
324 select GENERIC_IRQ_MIGRATION
326 Say Y here to allow turning CPUs off and on. CPUs can be
327 controlled through /sys/devices/system/cpu.
328 (Note: power management support will enable this option
329 automatically on SMP systems. )
330 Say N if you want to disable CPU hotplug.
333 int "Maximum number of CPUs (2-256)"
338 This allows you to specify the maximum number of CPUs which this
344 select ACPI_NUMA if ACPI
346 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access)
347 support. This option improves performance on systems with more
348 than one NUMA node; on single node systems it is generally better
349 to leave it disabled.
356 config FORCE_MAX_ZONEORDER
357 int "Maximum zone order"
358 range 14 64 if PAGE_SIZE_64KB
359 default "14" if PAGE_SIZE_64KB
360 range 12 64 if PAGE_SIZE_16KB
361 default "12" if PAGE_SIZE_16KB
365 The kernel memory allocator divides physically contiguous memory
366 blocks into "zones", where each zone is a power of two number of
367 pages. This option selects the largest power of two that the kernel
368 keeps in the memory allocator. If you need to allocate very large
369 blocks of physically contiguous memory, then you may need to
372 This config option is actually maximum order plus one. For example,
373 a value of 11 means that the largest free memory block is 2^10 pages.
375 The page size is not necessarily 4KB. Keep this in mind
376 when choosing a value for this option.
379 bool "Enable seccomp to safely compute untrusted bytecode"
383 This kernel feature is useful for number crunching applications
384 that may need to compute untrusted bytecode during their
385 execution. By using pipes or other transports made available to
386 the process as file descriptors supporting the read/write
387 syscalls, it's possible to isolate those applications in
388 their own address space using seccomp. Once seccomp is
389 enabled via /proc/<pid>/seccomp, it cannot be disabled
390 and the task is only allowed to execute a few safe syscalls
391 defined by each seccomp mode.
393 If unsure, say Y. Only embedded should say N here.
397 config ARCH_SELECT_MEMORY_MODEL
400 config ARCH_FLATMEM_ENABLE
404 config ARCH_SPARSEMEM_ENABLE
407 Say Y to support efficient handling of sparse physical memory,
408 for architectures which are either NUMA (Non-Uniform Memory Access)
409 or have huge holes in the physical address space for other reasons.
410 See <file:Documentation/vm/numa.rst> for more.
412 config ARCH_ENABLE_THP_MIGRATION
414 depends on TRANSPARENT_HUGEPAGE
416 config ARCH_MEMORY_PROBE
418 depends on MEMORY_HOTPLUG
424 config ARCH_MMAP_RND_BITS_MIN
427 config ARCH_MMAP_RND_BITS_MAX
430 menu "Power management options"
432 source "drivers/acpi/Kconfig"
436 source "drivers/firmware/Kconfig"