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 PCI_DOMAINS_GENERIC
116 select PCI_ECAM if ACPI
118 select PCI_MSI_ARCH_FALLBACKS
120 select PERF_USE_VMALLOC
124 select SYSCTL_EXCEPTION_TRACE
126 select TRACE_IRQFLAGS_SUPPORT
127 select USE_PERCPU_NUMA_NODE_ID
128 select USER_STACKTRACE_SUPPORT
141 config CPU_HAS_PREFETCH
149 config GENERIC_BUG_RELATIVE_POINTERS
151 depends on GENERIC_BUG
153 config GENERIC_CALIBRATE_DELAY
159 config GENERIC_HWEIGHT
162 config L1_CACHE_SHIFT
166 config LOCKDEP_SUPPORT
170 config STACKTRACE_SUPPORT
174 # MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the
175 # MIPS Loongson code, to preserve Loongson-specific code paths in drivers that
176 # are shared between architectures, and specifically expecting the symbols.
177 config MACH_LOONGSON32
180 config MACH_LOONGSON64
183 config FIX_EARLYCON_MEM
189 config PAGE_SIZE_16KB
192 config PAGE_SIZE_64KB
195 config PGTABLE_2LEVEL
198 config PGTABLE_3LEVEL
201 config PGTABLE_4LEVEL
204 config PGTABLE_LEVELS
206 default 2 if PGTABLE_2LEVEL
207 default 3 if PGTABLE_3LEVEL
208 default 4 if PGTABLE_4LEVEL
210 config SCHED_OMIT_FRAME_POINTER
214 config AS_HAS_EXPLICIT_RELOCS
215 def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x))
217 menu "Kernel type and options"
219 source "kernel/Kconfig.hz"
222 prompt "Page Table Layout"
223 default 16KB_2LEVEL if 32BIT
224 default 16KB_3LEVEL if 64BIT
226 Allows choosing the page table layout, which is a combination
227 of page size and page table levels. The size of virtual memory
228 address space are determined by the page table layout.
231 bool "4KB with 3 levels"
233 select PGTABLE_3LEVEL
235 This option selects 4KB page size with 3 level page tables, which
236 support a maximum of 39 bits of application virtual memory.
239 bool "4KB with 4 levels"
241 select PGTABLE_4LEVEL
243 This option selects 4KB page size with 4 level page tables, which
244 support a maximum of 48 bits of application virtual memory.
247 bool "16KB with 2 levels"
248 select PAGE_SIZE_16KB
249 select PGTABLE_2LEVEL
251 This option selects 16KB page size with 2 level page tables, which
252 support a maximum of 36 bits of application virtual memory.
255 bool "16KB with 3 levels"
256 select PAGE_SIZE_16KB
257 select PGTABLE_3LEVEL
259 This option selects 16KB page size with 3 level page tables, which
260 support a maximum of 47 bits of application virtual memory.
263 bool "64KB with 2 levels"
264 select PAGE_SIZE_64KB
265 select PGTABLE_2LEVEL
267 This option selects 64KB page size with 2 level page tables, which
268 support a maximum of 42 bits of application virtual memory.
271 bool "64KB with 3 levels"
272 select PAGE_SIZE_64KB
273 select PGTABLE_3LEVEL
275 This option selects 64KB page size with 3 level page tables, which
276 support a maximum of 55 bits of application virtual memory.
281 string "Built-in kernel command line"
283 For most platforms, the arguments for the kernel's command line
284 are provided at run-time, during boot. However, there are cases
285 where either no arguments are being provided or the provided
286 arguments are insufficient or even invalid.
288 When that occurs, it is possible to define a built-in command
289 line here and choose how the kernel should use it later on.
292 prompt "Kernel command line type"
293 default CMDLINE_BOOTLOADER
295 Choose how the kernel will handle the provided built-in command
298 config CMDLINE_BOOTLOADER
299 bool "Use bootloader kernel arguments if available"
301 Prefer the command-line passed by the boot loader if available.
302 Use the built-in command line as fallback in case we get nothing
303 during boot. This is the default behaviour.
305 config CMDLINE_EXTEND
306 bool "Use built-in to extend bootloader kernel arguments"
308 The command-line arguments provided during boot will be
309 appended to the built-in command line. This is useful in
310 cases where the provided arguments are insufficient and
311 you don't want to or cannot modify them.
314 bool "Always use the built-in kernel command string"
316 Always use the built-in command line, even if we get one during
317 boot. This is useful in case you need to override the provided
318 command line on systems where you don't have or want control
324 bool "Enable DMI scanning"
325 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
328 This enables SMBIOS/DMI feature for systems, and scanning of
329 DMI to identify machine quirks.
332 bool "EFI runtime service support"
334 select EFI_RUNTIME_WRAPPERS
336 This enables the kernel to use EFI runtime services that are
337 available (such as the EFI variable services).
340 bool "EFI boot stub support"
343 select EFI_GENERIC_STUB
345 This kernel feature allows the kernel to be loaded directly by
346 EFI firmware without the use of a bootloader.
349 bool "Multi-Processing support"
351 This enables support for systems with more than one CPU. If you have
352 a system with only one CPU, say N. If you have a system with more
355 If you say N here, the kernel will run on uni- and multiprocessor
356 machines, but will use only one CPU of a multiprocessor machine. If
357 you say Y here, the kernel will run on many, but not all,
358 uniprocessor machines. On a uniprocessor machine, the kernel
359 will run faster if you say N here.
361 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>.
363 If you don't know what to do here, say N.
366 bool "Support for hot-pluggable CPUs"
368 select GENERIC_IRQ_MIGRATION
370 Say Y here to allow turning CPUs off and on. CPUs can be
371 controlled through /sys/devices/system/cpu.
372 (Note: power management support will enable this option
373 automatically on SMP systems. )
374 Say N if you want to disable CPU hotplug.
377 int "Maximum number of CPUs (2-256)"
382 This allows you to specify the maximum number of CPUs which this
388 select ACPI_NUMA if ACPI
390 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access)
391 support. This option improves performance on systems with more
392 than one NUMA node; on single node systems it is generally better
393 to leave it disabled.
400 config ARCH_FORCE_MAX_ORDER
401 int "Maximum zone order"
402 range 14 64 if PAGE_SIZE_64KB
403 default "14" if PAGE_SIZE_64KB
404 range 12 64 if PAGE_SIZE_16KB
405 default "12" if PAGE_SIZE_16KB
409 The kernel memory allocator divides physically contiguous memory
410 blocks into "zones", where each zone is a power of two number of
411 pages. This option selects the largest power of two that the kernel
412 keeps in the memory allocator. If you need to allocate very large
413 blocks of physically contiguous memory, then you may need to
416 This config option is actually maximum order plus one. For example,
417 a value of 11 means that the largest free memory block is 2^10 pages.
419 The page size is not necessarily 4KB. Keep this in mind
420 when choosing a value for this option.
423 bool "Enable LoongArch DMW-based ioremap()"
425 We use generic TLB-based ioremap() by default since it has page
426 protection support. However, you can enable LoongArch DMW-based
427 ioremap() for better performance.
430 bool "Kexec system call"
433 kexec is a system call that implements the ability to shutdown your
434 current kernel, and to start another kernel. It is like a reboot
435 but it is independent of the system firmware. And like a reboot
436 you can start any kernel with it, not just Linux.
438 The name comes from the similarity to the exec system call.
441 bool "Build kdump crash kernel"
443 Generate crash dump after being started by kexec. This should
444 be normally only set in special crash dump kernels which are
445 loaded in the main kernel with kexec-tools into a specially
446 reserved region and then later executed after a crash by
449 For more details see Documentation/admin-guide/kdump/kdump.rst
451 config PHYSICAL_START
452 hex "Physical address where the kernel is loaded"
453 default "0x90000000a0000000"
454 depends on CRASH_DUMP
456 This gives the XKPRANGE address where the kernel is loaded.
457 If you plan to use kernel for capturing the crash dump change
458 this value to start of the reserved region (the "X" value as
459 specified in the "crashkernel=YM@XM" command line boot parameter
460 passed to the panic-ed kernel).
463 bool "Enable seccomp to safely compute untrusted bytecode"
467 This kernel feature is useful for number crunching applications
468 that may need to compute untrusted bytecode during their
469 execution. By using pipes or other transports made available to
470 the process as file descriptors supporting the read/write
471 syscalls, it's possible to isolate those applications in
472 their own address space using seccomp. Once seccomp is
473 enabled via /proc/<pid>/seccomp, it cannot be disabled
474 and the task is only allowed to execute a few safe syscalls
475 defined by each seccomp mode.
477 If unsure, say Y. Only embedded should say N here.
481 config ARCH_SELECT_MEMORY_MODEL
484 config ARCH_FLATMEM_ENABLE
488 config ARCH_SPARSEMEM_ENABLE
491 Say Y to support efficient handling of sparse physical memory,
492 for architectures which are either NUMA (Non-Uniform Memory Access)
493 or have huge holes in the physical address space for other reasons.
494 See <file:Documentation/mm/numa.rst> for more.
496 config ARCH_ENABLE_THP_MIGRATION
498 depends on TRANSPARENT_HUGEPAGE
500 config ARCH_MEMORY_PROBE
502 depends on MEMORY_HOTPLUG
508 config ARCH_MMAP_RND_BITS_MIN
511 config ARCH_MMAP_RND_BITS_MAX
514 menu "Power management options"
516 source "drivers/acpi/Kconfig"
520 source "drivers/firmware/Kconfig"