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_LD_ORPHAN_WARN
57 select ARCH_WANTS_NO_INSTR
58 select BUILDTIME_TABLE_SORT
61 select GENERIC_CLOCKEVENTS
62 select GENERIC_CMOS_UPDATE
63 select GENERIC_CPU_AUTOPROBE
65 select GENERIC_GETTIMEOFDAY
66 select GENERIC_IOREMAP if !ARCH_IOREMAP
67 select GENERIC_IRQ_MULTI_HANDLER
68 select GENERIC_IRQ_PROBE
69 select GENERIC_IRQ_SHOW
70 select GENERIC_LIB_ASHLDI3
71 select GENERIC_LIB_ASHRDI3
72 select GENERIC_LIB_CMPDI2
73 select GENERIC_LIB_LSHRDI3
74 select GENERIC_LIB_UCMPDI2
75 select GENERIC_LIB_DEVMEM_IS_ALLOWED
76 select GENERIC_PCI_IOMAP
77 select GENERIC_SCHED_CLOCK
78 select GENERIC_SMP_IDLE_THREAD
79 select GENERIC_TIME_VSYSCALL
81 select HAVE_ARCH_AUDITSYSCALL
82 select HAVE_ARCH_MMAP_RND_BITS if MMU
83 select HAVE_ARCH_SECCOMP_FILTER
84 select HAVE_ARCH_TRACEHOOK
85 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
86 select HAVE_ASM_MODVERSIONS
87 select HAVE_CONTEXT_TRACKING_USER
88 select HAVE_DEBUG_STACKOVERFLOW
89 select HAVE_DMA_CONTIGUOUS
91 select HAVE_EXIT_THREAD
93 select HAVE_GENERIC_VDSO
94 select HAVE_IOREMAP_PROT
95 select HAVE_IRQ_EXIT_ON_IRQ_STACK
96 select HAVE_IRQ_TIME_ACCOUNTING
97 select HAVE_MOD_ARCH_SPECIFIC
100 select HAVE_PERF_EVENTS
101 select HAVE_PERF_REGS
102 select HAVE_PERF_USER_STACK_DUMP
103 select HAVE_REGS_AND_STACK_ACCESS_API
105 select HAVE_SETUP_PER_CPU_AREA if NUMA
106 select HAVE_SYSCALL_TRACEPOINTS
108 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP
109 select IRQ_FORCED_THREADING
110 select IRQ_LOONGARCH_CPU
111 select MMU_GATHER_MERGE_VMAS if MMU
112 select MODULES_USE_ELF_RELA if MODULES
113 select NEED_PER_CPU_EMBED_FIRST_CHUNK
114 select NEED_PER_CPU_PAGE_FIRST_CHUNK
116 select PCI_DOMAINS_GENERIC
117 select PCI_ECAM if ACPI
119 select PCI_MSI_ARCH_FALLBACKS
121 select PERF_USE_VMALLOC
125 select SYSCTL_EXCEPTION_TRACE
127 select TRACE_IRQFLAGS_SUPPORT
128 select USE_PERCPU_NUMA_NODE_ID
129 select USER_STACKTRACE_SUPPORT
142 config CPU_HAS_PREFETCH
150 config GENERIC_BUG_RELATIVE_POINTERS
152 depends on GENERIC_BUG
154 config GENERIC_CALIBRATE_DELAY
160 config GENERIC_HWEIGHT
163 config L1_CACHE_SHIFT
167 config LOCKDEP_SUPPORT
171 config STACKTRACE_SUPPORT
175 # MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the
176 # MIPS Loongson code, to preserve Loongson-specific code paths in drivers that
177 # are shared between architectures, and specifically expecting the symbols.
178 config MACH_LOONGSON32
181 config MACH_LOONGSON64
184 config FIX_EARLYCON_MEM
190 config PAGE_SIZE_16KB
193 config PAGE_SIZE_64KB
196 config PGTABLE_2LEVEL
199 config PGTABLE_3LEVEL
202 config PGTABLE_4LEVEL
205 config PGTABLE_LEVELS
207 default 2 if PGTABLE_2LEVEL
208 default 3 if PGTABLE_3LEVEL
209 default 4 if PGTABLE_4LEVEL
211 config SCHED_OMIT_FRAME_POINTER
215 config AS_HAS_EXPLICIT_RELOCS
216 def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x))
218 menu "Kernel type and options"
220 source "kernel/Kconfig.hz"
223 prompt "Page Table Layout"
224 default 16KB_2LEVEL if 32BIT
225 default 16KB_3LEVEL if 64BIT
227 Allows choosing the page table layout, which is a combination
228 of page size and page table levels. The size of virtual memory
229 address space are determined by the page table layout.
232 bool "4KB with 3 levels"
234 select PGTABLE_3LEVEL
236 This option selects 4KB page size with 3 level page tables, which
237 support a maximum of 39 bits of application virtual memory.
240 bool "4KB with 4 levels"
242 select PGTABLE_4LEVEL
244 This option selects 4KB page size with 4 level page tables, which
245 support a maximum of 48 bits of application virtual memory.
248 bool "16KB with 2 levels"
249 select PAGE_SIZE_16KB
250 select PGTABLE_2LEVEL
252 This option selects 16KB page size with 2 level page tables, which
253 support a maximum of 36 bits of application virtual memory.
256 bool "16KB with 3 levels"
257 select PAGE_SIZE_16KB
258 select PGTABLE_3LEVEL
260 This option selects 16KB page size with 3 level page tables, which
261 support a maximum of 47 bits of application virtual memory.
264 bool "64KB with 2 levels"
265 select PAGE_SIZE_64KB
266 select PGTABLE_2LEVEL
268 This option selects 64KB page size with 2 level page tables, which
269 support a maximum of 42 bits of application virtual memory.
272 bool "64KB with 3 levels"
273 select PAGE_SIZE_64KB
274 select PGTABLE_3LEVEL
276 This option selects 64KB page size with 3 level page tables, which
277 support a maximum of 55 bits of application virtual memory.
282 string "Built-in kernel command line"
284 For most platforms, the arguments for the kernel's command line
285 are provided at run-time, during boot. However, there are cases
286 where either no arguments are being provided or the provided
287 arguments are insufficient or even invalid.
289 When that occurs, it is possible to define a built-in command
290 line here and choose how the kernel should use it later on.
293 prompt "Kernel command line type"
294 default CMDLINE_BOOTLOADER
296 Choose how the kernel will handle the provided built-in command
299 config CMDLINE_BOOTLOADER
300 bool "Use bootloader kernel arguments if available"
302 Prefer the command-line passed by the boot loader if available.
303 Use the built-in command line as fallback in case we get nothing
304 during boot. This is the default behaviour.
306 config CMDLINE_EXTEND
307 bool "Use built-in to extend bootloader kernel arguments"
309 The command-line arguments provided during boot will be
310 appended to the built-in command line. This is useful in
311 cases where the provided arguments are insufficient and
312 you don't want to or cannot modify them.
315 bool "Always use the built-in kernel command string"
317 Always use the built-in command line, even if we get one during
318 boot. This is useful in case you need to override the provided
319 command line on systems where you don't have or want control
325 bool "Enable DMI scanning"
326 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
329 This enables SMBIOS/DMI feature for systems, and scanning of
330 DMI to identify machine quirks.
333 bool "EFI runtime service support"
335 select EFI_RUNTIME_WRAPPERS
337 This enables the kernel to use EFI runtime services that are
338 available (such as the EFI variable services).
341 bool "EFI boot stub support"
344 select EFI_GENERIC_STUB
346 This kernel feature allows the kernel to be loaded directly by
347 EFI firmware without the use of a bootloader.
350 bool "Multi-Processing support"
352 This enables support for systems with more than one CPU. If you have
353 a system with only one CPU, say N. If you have a system with more
356 If you say N here, the kernel will run on uni- and multiprocessor
357 machines, but will use only one CPU of a multiprocessor machine. If
358 you say Y here, the kernel will run on many, but not all,
359 uniprocessor machines. On a uniprocessor machine, the kernel
360 will run faster if you say N here.
362 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>.
364 If you don't know what to do here, say N.
367 bool "Support for hot-pluggable CPUs"
369 select GENERIC_IRQ_MIGRATION
371 Say Y here to allow turning CPUs off and on. CPUs can be
372 controlled through /sys/devices/system/cpu.
373 (Note: power management support will enable this option
374 automatically on SMP systems. )
375 Say N if you want to disable CPU hotplug.
378 int "Maximum number of CPUs (2-256)"
383 This allows you to specify the maximum number of CPUs which this
389 select ACPI_NUMA if ACPI
391 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access)
392 support. This option improves performance on systems with more
393 than one NUMA node; on single node systems it is generally better
394 to leave it disabled.
401 config ARCH_FORCE_MAX_ORDER
402 int "Maximum zone order"
403 range 14 64 if PAGE_SIZE_64KB
404 default "14" if PAGE_SIZE_64KB
405 range 12 64 if PAGE_SIZE_16KB
406 default "12" if PAGE_SIZE_16KB
410 The kernel memory allocator divides physically contiguous memory
411 blocks into "zones", where each zone is a power of two number of
412 pages. This option selects the largest power of two that the kernel
413 keeps in the memory allocator. If you need to allocate very large
414 blocks of physically contiguous memory, then you may need to
417 This config option is actually maximum order plus one. For example,
418 a value of 11 means that the largest free memory block is 2^10 pages.
420 The page size is not necessarily 4KB. Keep this in mind
421 when choosing a value for this option.
424 bool "Enable LoongArch DMW-based ioremap()"
426 We use generic TLB-based ioremap() by default since it has page
427 protection support. However, you can enable LoongArch DMW-based
428 ioremap() for better performance.
431 bool "Kexec system call"
434 kexec is a system call that implements the ability to shutdown your
435 current kernel, and to start another kernel. It is like a reboot
436 but it is independent of the system firmware. And like a reboot
437 you can start any kernel with it, not just Linux.
439 The name comes from the similarity to the exec system call.
442 bool "Build kdump crash kernel"
444 Generate crash dump after being started by kexec. This should
445 be normally only set in special crash dump kernels which are
446 loaded in the main kernel with kexec-tools into a specially
447 reserved region and then later executed after a crash by
450 For more details see Documentation/admin-guide/kdump/kdump.rst
452 config PHYSICAL_START
453 hex "Physical address where the kernel is loaded"
454 default "0x90000000a0000000"
455 depends on CRASH_DUMP
457 This gives the XKPRANGE address where the kernel is loaded.
458 If you plan to use kernel for capturing the crash dump change
459 this value to start of the reserved region (the "X" value as
460 specified in the "crashkernel=YM@XM" command line boot parameter
461 passed to the panic-ed kernel).
464 bool "Enable seccomp to safely compute untrusted bytecode"
468 This kernel feature is useful for number crunching applications
469 that may need to compute untrusted bytecode during their
470 execution. By using pipes or other transports made available to
471 the process as file descriptors supporting the read/write
472 syscalls, it's possible to isolate those applications in
473 their own address space using seccomp. Once seccomp is
474 enabled via /proc/<pid>/seccomp, it cannot be disabled
475 and the task is only allowed to execute a few safe syscalls
476 defined by each seccomp mode.
478 If unsure, say Y. Only embedded should say N here.
482 config ARCH_SELECT_MEMORY_MODEL
485 config ARCH_FLATMEM_ENABLE
489 config ARCH_SPARSEMEM_ENABLE
492 Say Y to support efficient handling of sparse physical memory,
493 for architectures which are either NUMA (Non-Uniform Memory Access)
494 or have huge holes in the physical address space for other reasons.
495 See <file:Documentation/mm/numa.rst> for more.
497 config ARCH_ENABLE_THP_MIGRATION
499 depends on TRANSPARENT_HUGEPAGE
501 config ARCH_MEMORY_PROBE
503 depends on MEMORY_HOTPLUG
509 config ARCH_MMAP_RND_BITS_MIN
512 config ARCH_MMAP_RND_BITS_MAX
515 menu "Power management options"
517 source "drivers/acpi/Kconfig"
521 source "drivers/firmware/Kconfig"