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
60 select GENERIC_CLOCKEVENTS
61 select GENERIC_CMOS_UPDATE
62 select GENERIC_CPU_AUTOPROBE
64 select GENERIC_GETTIMEOFDAY
65 select GENERIC_IOREMAP if !ARCH_IOREMAP
66 select GENERIC_IRQ_MULTI_HANDLER
67 select GENERIC_IRQ_PROBE
68 select GENERIC_IRQ_SHOW
69 select GENERIC_LIB_ASHLDI3
70 select GENERIC_LIB_ASHRDI3
71 select GENERIC_LIB_CMPDI2
72 select GENERIC_LIB_LSHRDI3
73 select GENERIC_LIB_UCMPDI2
74 select GENERIC_LIB_DEVMEM_IS_ALLOWED
75 select GENERIC_PCI_IOMAP
76 select GENERIC_SCHED_CLOCK
77 select GENERIC_SMP_IDLE_THREAD
78 select GENERIC_TIME_VSYSCALL
80 select HAVE_ARCH_AUDITSYSCALL
81 select HAVE_ARCH_MMAP_RND_BITS if MMU
82 select HAVE_ARCH_SECCOMP_FILTER
83 select HAVE_ARCH_TRACEHOOK
84 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
85 select HAVE_ASM_MODVERSIONS
86 select HAVE_CONTEXT_TRACKING_USER
87 select HAVE_DEBUG_STACKOVERFLOW
88 select HAVE_DMA_CONTIGUOUS
90 select HAVE_EXIT_THREAD
92 select HAVE_GENERIC_VDSO
93 select HAVE_IOREMAP_PROT
94 select HAVE_IRQ_EXIT_ON_IRQ_STACK
95 select HAVE_IRQ_TIME_ACCOUNTING
96 select HAVE_MOD_ARCH_SPECIFIC
99 select HAVE_PERF_EVENTS
100 select HAVE_PERF_REGS
101 select HAVE_PERF_USER_STACK_DUMP
102 select HAVE_REGS_AND_STACK_ACCESS_API
104 select HAVE_SETUP_PER_CPU_AREA if NUMA
105 select HAVE_SYSCALL_TRACEPOINTS
107 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP
108 select IRQ_FORCED_THREADING
109 select IRQ_LOONGARCH_CPU
110 select MMU_GATHER_MERGE_VMAS if MMU
111 select MODULES_USE_ELF_RELA if MODULES
112 select NEED_PER_CPU_EMBED_FIRST_CHUNK
113 select NEED_PER_CPU_PAGE_FIRST_CHUNK
115 select OF_EARLY_FLATTREE
117 select PCI_DOMAINS_GENERIC
118 select PCI_ECAM if ACPI
120 select PCI_MSI_ARCH_FALLBACKS
122 select PERF_USE_VMALLOC
126 select SYSCTL_ARCH_UNALIGN_ALLOW
127 select SYSCTL_ARCH_UNALIGN_NO_WARN
128 select SYSCTL_EXCEPTION_TRACE
130 select TRACE_IRQFLAGS_SUPPORT
131 select USE_PERCPU_NUMA_NODE_ID
132 select USER_STACKTRACE_SUPPORT
145 config CPU_HAS_PREFETCH
153 config GENERIC_BUG_RELATIVE_POINTERS
155 depends on GENERIC_BUG
157 config GENERIC_CALIBRATE_DELAY
163 config GENERIC_HWEIGHT
166 config L1_CACHE_SHIFT
170 config LOCKDEP_SUPPORT
174 config STACKTRACE_SUPPORT
178 # MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the
179 # MIPS Loongson code, to preserve Loongson-specific code paths in drivers that
180 # are shared between architectures, and specifically expecting the symbols.
181 config MACH_LOONGSON32
184 config MACH_LOONGSON64
187 config FIX_EARLYCON_MEM
193 config PAGE_SIZE_16KB
196 config PAGE_SIZE_64KB
199 config PGTABLE_2LEVEL
202 config PGTABLE_3LEVEL
205 config PGTABLE_4LEVEL
208 config PGTABLE_LEVELS
210 default 2 if PGTABLE_2LEVEL
211 default 3 if PGTABLE_3LEVEL
212 default 4 if PGTABLE_4LEVEL
214 config SCHED_OMIT_FRAME_POINTER
218 config AS_HAS_EXPLICIT_RELOCS
219 def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x))
221 menu "Kernel type and options"
223 source "kernel/Kconfig.hz"
226 prompt "Page Table Layout"
227 default 16KB_2LEVEL if 32BIT
228 default 16KB_3LEVEL if 64BIT
230 Allows choosing the page table layout, which is a combination
231 of page size and page table levels. The size of virtual memory
232 address space are determined by the page table layout.
235 bool "4KB with 3 levels"
237 select PGTABLE_3LEVEL
239 This option selects 4KB page size with 3 level page tables, which
240 support a maximum of 39 bits of application virtual memory.
243 bool "4KB with 4 levels"
245 select PGTABLE_4LEVEL
247 This option selects 4KB page size with 4 level page tables, which
248 support a maximum of 48 bits of application virtual memory.
251 bool "16KB with 2 levels"
252 select PAGE_SIZE_16KB
253 select PGTABLE_2LEVEL
255 This option selects 16KB page size with 2 level page tables, which
256 support a maximum of 36 bits of application virtual memory.
259 bool "16KB with 3 levels"
260 select PAGE_SIZE_16KB
261 select PGTABLE_3LEVEL
263 This option selects 16KB page size with 3 level page tables, which
264 support a maximum of 47 bits of application virtual memory.
267 bool "64KB with 2 levels"
268 select PAGE_SIZE_64KB
269 select PGTABLE_2LEVEL
271 This option selects 64KB page size with 2 level page tables, which
272 support a maximum of 42 bits of application virtual memory.
275 bool "64KB with 3 levels"
276 select PAGE_SIZE_64KB
277 select PGTABLE_3LEVEL
279 This option selects 64KB page size with 3 level page tables, which
280 support a maximum of 55 bits of application virtual memory.
285 string "Built-in kernel command line"
287 For most platforms, the arguments for the kernel's command line
288 are provided at run-time, during boot. However, there are cases
289 where either no arguments are being provided or the provided
290 arguments are insufficient or even invalid.
292 When that occurs, it is possible to define a built-in command
293 line here and choose how the kernel should use it later on.
296 prompt "Kernel command line type"
297 default CMDLINE_BOOTLOADER
299 Choose how the kernel will handle the provided built-in command
302 config CMDLINE_BOOTLOADER
303 bool "Use bootloader kernel arguments if available"
305 Prefer the command-line passed by the boot loader if available.
306 Use the built-in command line as fallback in case we get nothing
307 during boot. This is the default behaviour.
309 config CMDLINE_EXTEND
310 bool "Use built-in to extend bootloader kernel arguments"
312 The command-line arguments provided during boot will be
313 appended to the built-in command line. This is useful in
314 cases where the provided arguments are insufficient and
315 you don't want to or cannot modify them.
318 bool "Always use the built-in kernel command string"
320 Always use the built-in command line, even if we get one during
321 boot. This is useful in case you need to override the provided
322 command line on systems where you don't have or want control
328 bool "Enable DMI scanning"
329 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
332 This enables SMBIOS/DMI feature for systems, and scanning of
333 DMI to identify machine quirks.
336 bool "EFI runtime service support"
338 select EFI_RUNTIME_WRAPPERS
340 This enables the kernel to use EFI runtime services that are
341 available (such as the EFI variable services).
344 bool "EFI boot stub support"
347 select EFI_GENERIC_STUB
349 This kernel feature allows the kernel to be loaded directly by
350 EFI firmware without the use of a bootloader.
353 bool "Multi-Processing support"
355 This enables support for systems with more than one CPU. If you have
356 a system with only one CPU, say N. If you have a system with more
359 If you say N here, the kernel will run on uni- and multiprocessor
360 machines, but will use only one CPU of a multiprocessor machine. If
361 you say Y here, the kernel will run on many, but not all,
362 uniprocessor machines. On a uniprocessor machine, the kernel
363 will run faster if you say N here.
365 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>.
367 If you don't know what to do here, say N.
370 bool "Support for hot-pluggable CPUs"
372 select GENERIC_IRQ_MIGRATION
374 Say Y here to allow turning CPUs off and on. CPUs can be
375 controlled through /sys/devices/system/cpu.
376 (Note: power management support will enable this option
377 automatically on SMP systems. )
378 Say N if you want to disable CPU hotplug.
381 int "Maximum number of CPUs (2-256)"
386 This allows you to specify the maximum number of CPUs which this
392 select ACPI_NUMA if ACPI
394 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access)
395 support. This option improves performance on systems with more
396 than one NUMA node; on single node systems it is generally better
397 to leave it disabled.
404 config ARCH_FORCE_MAX_ORDER
405 int "Maximum zone order"
406 range 14 64 if PAGE_SIZE_64KB
407 default "14" if PAGE_SIZE_64KB
408 range 12 64 if PAGE_SIZE_16KB
409 default "12" if PAGE_SIZE_16KB
413 The kernel memory allocator divides physically contiguous memory
414 blocks into "zones", where each zone is a power of two number of
415 pages. This option selects the largest power of two that the kernel
416 keeps in the memory allocator. If you need to allocate very large
417 blocks of physically contiguous memory, then you may need to
420 This config option is actually maximum order plus one. For example,
421 a value of 11 means that the largest free memory block is 2^10 pages.
423 The page size is not necessarily 4KB. Keep this in mind
424 when choosing a value for this option.
427 bool "Enable LoongArch DMW-based ioremap()"
429 We use generic TLB-based ioremap() by default since it has page
430 protection support. However, you can enable LoongArch DMW-based
431 ioremap() for better performance.
434 bool "Kexec system call"
437 kexec is a system call that implements the ability to shutdown your
438 current kernel, and to start another kernel. It is like a reboot
439 but it is independent of the system firmware. And like a reboot
440 you can start any kernel with it, not just Linux.
442 The name comes from the similarity to the exec system call.
445 bool "Build kdump crash kernel"
447 Generate crash dump after being started by kexec. This should
448 be normally only set in special crash dump kernels which are
449 loaded in the main kernel with kexec-tools into a specially
450 reserved region and then later executed after a crash by
453 For more details see Documentation/admin-guide/kdump/kdump.rst
455 config PHYSICAL_START
456 hex "Physical address where the kernel is loaded"
457 default "0x90000000a0000000"
458 depends on CRASH_DUMP
460 This gives the XKPRANGE address where the kernel is loaded.
461 If you plan to use kernel for capturing the crash dump change
462 this value to start of the reserved region (the "X" value as
463 specified in the "crashkernel=YM@XM" command line boot parameter
464 passed to the panic-ed kernel).
467 bool "Enable seccomp to safely compute untrusted bytecode"
471 This kernel feature is useful for number crunching applications
472 that may need to compute untrusted bytecode during their
473 execution. By using pipes or other transports made available to
474 the process as file descriptors supporting the read/write
475 syscalls, it's possible to isolate those applications in
476 their own address space using seccomp. Once seccomp is
477 enabled via /proc/<pid>/seccomp, it cannot be disabled
478 and the task is only allowed to execute a few safe syscalls
479 defined by each seccomp mode.
481 If unsure, say Y. Only embedded should say N here.
485 config ARCH_SELECT_MEMORY_MODEL
488 config ARCH_FLATMEM_ENABLE
492 config ARCH_SPARSEMEM_ENABLE
495 Say Y to support efficient handling of sparse physical memory,
496 for architectures which are either NUMA (Non-Uniform Memory Access)
497 or have huge holes in the physical address space for other reasons.
498 See <file:Documentation/mm/numa.rst> for more.
500 config ARCH_ENABLE_THP_MIGRATION
502 depends on TRANSPARENT_HUGEPAGE
504 config ARCH_MEMORY_PROBE
506 depends on MEMORY_HOTPLUG
512 config ARCH_MMAP_RND_BITS_MIN
515 config ARCH_MMAP_RND_BITS_MAX
518 menu "Power management options"
520 source "drivers/acpi/Kconfig"
524 source "drivers/firmware/Kconfig"