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_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
57 select ARCH_WANT_LD_ORPHAN_WARN
58 select ARCH_WANTS_NO_INSTR
59 select BUILDTIME_TABLE_SORT
62 select GENERIC_CLOCKEVENTS
63 select GENERIC_CMOS_UPDATE
64 select GENERIC_CPU_AUTOPROBE
66 select GENERIC_GETTIMEOFDAY
67 select GENERIC_IOREMAP if !ARCH_IOREMAP
68 select GENERIC_IRQ_MULTI_HANDLER
69 select GENERIC_IRQ_PROBE
70 select GENERIC_IRQ_SHOW
71 select GENERIC_LIB_ASHLDI3
72 select GENERIC_LIB_ASHRDI3
73 select GENERIC_LIB_CMPDI2
74 select GENERIC_LIB_LSHRDI3
75 select GENERIC_LIB_UCMPDI2
76 select GENERIC_LIB_DEVMEM_IS_ALLOWED
77 select GENERIC_PCI_IOMAP
78 select GENERIC_SCHED_CLOCK
79 select GENERIC_SMP_IDLE_THREAD
80 select GENERIC_TIME_VSYSCALL
82 select HAVE_ARCH_AUDITSYSCALL
83 select HAVE_ARCH_MMAP_RND_BITS if MMU
84 select HAVE_ARCH_SECCOMP_FILTER
85 select HAVE_ARCH_TRACEHOOK
86 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
87 select HAVE_ASM_MODVERSIONS
88 select HAVE_CONTEXT_TRACKING_USER
89 select HAVE_DEBUG_STACKOVERFLOW
90 select HAVE_DMA_CONTIGUOUS
92 select HAVE_EXIT_THREAD
94 select HAVE_GENERIC_VDSO
95 select HAVE_IOREMAP_PROT
96 select HAVE_IRQ_EXIT_ON_IRQ_STACK
97 select HAVE_IRQ_TIME_ACCOUNTING
98 select HAVE_MOD_ARCH_SPECIFIC
101 select HAVE_PERF_EVENTS
102 select HAVE_PERF_REGS
103 select HAVE_PERF_USER_STACK_DUMP
104 select HAVE_REGS_AND_STACK_ACCESS_API
106 select HAVE_SETUP_PER_CPU_AREA if NUMA
107 select HAVE_SYSCALL_TRACEPOINTS
109 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP
110 select IRQ_FORCED_THREADING
111 select IRQ_LOONGARCH_CPU
112 select MMU_GATHER_MERGE_VMAS if MMU
113 select MODULES_USE_ELF_RELA if MODULES
114 select NEED_PER_CPU_EMBED_FIRST_CHUNK
115 select NEED_PER_CPU_PAGE_FIRST_CHUNK
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_EXCEPTION_TRACE
128 select TRACE_IRQFLAGS_SUPPORT
129 select USE_PERCPU_NUMA_NODE_ID
130 select USER_STACKTRACE_SUPPORT
143 config CPU_HAS_PREFETCH
151 config GENERIC_BUG_RELATIVE_POINTERS
153 depends on GENERIC_BUG
155 config GENERIC_CALIBRATE_DELAY
161 config GENERIC_HWEIGHT
164 config L1_CACHE_SHIFT
168 config LOCKDEP_SUPPORT
172 config STACKTRACE_SUPPORT
176 # MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the
177 # MIPS Loongson code, to preserve Loongson-specific code paths in drivers that
178 # are shared between architectures, and specifically expecting the symbols.
179 config MACH_LOONGSON32
182 config MACH_LOONGSON64
185 config FIX_EARLYCON_MEM
191 config PAGE_SIZE_16KB
194 config PAGE_SIZE_64KB
197 config PGTABLE_2LEVEL
200 config PGTABLE_3LEVEL
203 config PGTABLE_4LEVEL
206 config PGTABLE_LEVELS
208 default 2 if PGTABLE_2LEVEL
209 default 3 if PGTABLE_3LEVEL
210 default 4 if PGTABLE_4LEVEL
212 config SCHED_OMIT_FRAME_POINTER
216 config AS_HAS_EXPLICIT_RELOCS
217 def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x))
219 menu "Kernel type and options"
221 source "kernel/Kconfig.hz"
224 prompt "Page Table Layout"
225 default 16KB_2LEVEL if 32BIT
226 default 16KB_3LEVEL if 64BIT
228 Allows choosing the page table layout, which is a combination
229 of page size and page table levels. The size of virtual memory
230 address space are determined by the page table layout.
233 bool "4KB with 3 levels"
235 select PGTABLE_3LEVEL
237 This option selects 4KB page size with 3 level page tables, which
238 support a maximum of 39 bits of application virtual memory.
241 bool "4KB with 4 levels"
243 select PGTABLE_4LEVEL
245 This option selects 4KB page size with 4 level page tables, which
246 support a maximum of 48 bits of application virtual memory.
249 bool "16KB with 2 levels"
250 select PAGE_SIZE_16KB
251 select PGTABLE_2LEVEL
253 This option selects 16KB page size with 2 level page tables, which
254 support a maximum of 36 bits of application virtual memory.
257 bool "16KB with 3 levels"
258 select PAGE_SIZE_16KB
259 select PGTABLE_3LEVEL
261 This option selects 16KB page size with 3 level page tables, which
262 support a maximum of 47 bits of application virtual memory.
265 bool "64KB with 2 levels"
266 select PAGE_SIZE_64KB
267 select PGTABLE_2LEVEL
269 This option selects 64KB page size with 2 level page tables, which
270 support a maximum of 42 bits of application virtual memory.
273 bool "64KB with 3 levels"
274 select PAGE_SIZE_64KB
275 select PGTABLE_3LEVEL
277 This option selects 64KB page size with 3 level page tables, which
278 support a maximum of 55 bits of application virtual memory.
283 string "Built-in kernel command line"
285 For most platforms, the arguments for the kernel's command line
286 are provided at run-time, during boot. However, there are cases
287 where either no arguments are being provided or the provided
288 arguments are insufficient or even invalid.
290 When that occurs, it is possible to define a built-in command
291 line here and choose how the kernel should use it later on.
294 prompt "Kernel command line type"
295 default CMDLINE_BOOTLOADER
297 Choose how the kernel will handle the provided built-in command
300 config CMDLINE_BOOTLOADER
301 bool "Use bootloader kernel arguments if available"
303 Prefer the command-line passed by the boot loader if available.
304 Use the built-in command line as fallback in case we get nothing
305 during boot. This is the default behaviour.
307 config CMDLINE_EXTEND
308 bool "Use built-in to extend bootloader kernel arguments"
310 The command-line arguments provided during boot will be
311 appended to the built-in command line. This is useful in
312 cases where the provided arguments are insufficient and
313 you don't want to or cannot modify them.
316 bool "Always use the built-in kernel command string"
318 Always use the built-in command line, even if we get one during
319 boot. This is useful in case you need to override the provided
320 command line on systems where you don't have or want control
326 bool "Enable DMI scanning"
327 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
330 This enables SMBIOS/DMI feature for systems, and scanning of
331 DMI to identify machine quirks.
334 bool "EFI runtime service support"
336 select EFI_RUNTIME_WRAPPERS
338 This enables the kernel to use EFI runtime services that are
339 available (such as the EFI variable services).
342 bool "EFI boot stub support"
345 select EFI_GENERIC_STUB
347 This kernel feature allows the kernel to be loaded directly by
348 EFI firmware without the use of a bootloader.
351 bool "Multi-Processing support"
353 This enables support for systems with more than one CPU. If you have
354 a system with only one CPU, say N. If you have a system with more
357 If you say N here, the kernel will run on uni- and multiprocessor
358 machines, but will use only one CPU of a multiprocessor machine. If
359 you say Y here, the kernel will run on many, but not all,
360 uniprocessor machines. On a uniprocessor machine, the kernel
361 will run faster if you say N here.
363 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>.
365 If you don't know what to do here, say N.
368 bool "Support for hot-pluggable CPUs"
370 select GENERIC_IRQ_MIGRATION
372 Say Y here to allow turning CPUs off and on. CPUs can be
373 controlled through /sys/devices/system/cpu.
374 (Note: power management support will enable this option
375 automatically on SMP systems. )
376 Say N if you want to disable CPU hotplug.
379 int "Maximum number of CPUs (2-256)"
384 This allows you to specify the maximum number of CPUs which this
390 select ACPI_NUMA if ACPI
392 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access)
393 support. This option improves performance on systems with more
394 than one NUMA node; on single node systems it is generally better
395 to leave it disabled.
402 config ARCH_FORCE_MAX_ORDER
403 int "Maximum zone order"
404 range 14 64 if PAGE_SIZE_64KB
405 default "14" if PAGE_SIZE_64KB
406 range 12 64 if PAGE_SIZE_16KB
407 default "12" if PAGE_SIZE_16KB
411 The kernel memory allocator divides physically contiguous memory
412 blocks into "zones", where each zone is a power of two number of
413 pages. This option selects the largest power of two that the kernel
414 keeps in the memory allocator. If you need to allocate very large
415 blocks of physically contiguous memory, then you may need to
418 This config option is actually maximum order plus one. For example,
419 a value of 11 means that the largest free memory block is 2^10 pages.
421 The page size is not necessarily 4KB. Keep this in mind
422 when choosing a value for this option.
425 bool "Enable LoongArch DMW-based ioremap()"
427 We use generic TLB-based ioremap() by default since it has page
428 protection support. However, you can enable LoongArch DMW-based
429 ioremap() for better performance.
432 bool "Kexec system call"
435 kexec is a system call that implements the ability to shutdown your
436 current kernel, and to start another kernel. It is like a reboot
437 but it is independent of the system firmware. And like a reboot
438 you can start any kernel with it, not just Linux.
440 The name comes from the similarity to the exec system call.
443 bool "Build kdump crash kernel"
445 Generate crash dump after being started by kexec. This should
446 be normally only set in special crash dump kernels which are
447 loaded in the main kernel with kexec-tools into a specially
448 reserved region and then later executed after a crash by
451 For more details see Documentation/admin-guide/kdump/kdump.rst
453 config PHYSICAL_START
454 hex "Physical address where the kernel is loaded"
455 default "0x90000000a0000000"
456 depends on CRASH_DUMP
458 This gives the XKPRANGE address where the kernel is loaded.
459 If you plan to use kernel for capturing the crash dump change
460 this value to start of the reserved region (the "X" value as
461 specified in the "crashkernel=YM@XM" command line boot parameter
462 passed to the panic-ed kernel).
465 bool "Enable seccomp to safely compute untrusted bytecode"
469 This kernel feature is useful for number crunching applications
470 that may need to compute untrusted bytecode during their
471 execution. By using pipes or other transports made available to
472 the process as file descriptors supporting the read/write
473 syscalls, it's possible to isolate those applications in
474 their own address space using seccomp. Once seccomp is
475 enabled via /proc/<pid>/seccomp, it cannot be disabled
476 and the task is only allowed to execute a few safe syscalls
477 defined by each seccomp mode.
479 If unsure, say Y. Only embedded should say N here.
483 config ARCH_SELECT_MEMORY_MODEL
486 config ARCH_FLATMEM_ENABLE
490 config ARCH_SPARSEMEM_ENABLE
492 select SPARSEMEM_VMEMMAP_ENABLE
494 Say Y to support efficient handling of sparse physical memory,
495 for architectures which are either NUMA (Non-Uniform Memory Access)
496 or have huge holes in the physical address space for other reasons.
497 See <file:Documentation/mm/numa.rst> for more.
499 config ARCH_ENABLE_THP_MIGRATION
501 depends on TRANSPARENT_HUGEPAGE
503 config ARCH_MEMORY_PROBE
505 depends on MEMORY_HOTPLUG
511 config ARCH_MMAP_RND_BITS_MIN
514 config ARCH_MMAP_RND_BITS_MAX
517 menu "Power management options"
519 source "drivers/acpi/Kconfig"
523 source "drivers/firmware/Kconfig"