1 # SPDX-License-Identifier: GPL-2.0
6 select ACPI_GENERIC_GSI if ACPI
7 select ACPI_MCFG if ACPI
8 select ACPI_PPTT if ACPI
9 select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
10 select ARCH_BINFMT_ELF_STATE
11 select ARCH_ENABLE_MEMORY_HOTPLUG
12 select ARCH_ENABLE_MEMORY_HOTREMOVE
13 select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
14 select ARCH_HAS_CPU_FINALIZE_INIT
15 select ARCH_HAS_FORTIFY_SOURCE
16 select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
17 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
18 select ARCH_HAS_PTE_SPECIAL
19 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
20 select ARCH_INLINE_READ_LOCK if !PREEMPTION
21 select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION
22 select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION
23 select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION
24 select ARCH_INLINE_READ_UNLOCK if !PREEMPTION
25 select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION
26 select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION
27 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION
28 select ARCH_INLINE_WRITE_LOCK if !PREEMPTION
29 select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION
30 select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION
31 select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION
32 select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION
33 select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION
34 select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION
35 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION
36 select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION
37 select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION
38 select ARCH_INLINE_SPIN_LOCK if !PREEMPTION
39 select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION
40 select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION
41 select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION
42 select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION
43 select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION
44 select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION
45 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION
46 select ARCH_KEEP_MEMBLOCK
47 select ARCH_MIGHT_HAVE_PC_PARPORT
48 select ARCH_MIGHT_HAVE_PC_SERIO
49 select ARCH_SPARSEMEM_ENABLE
51 select ARCH_SUPPORTS_ACPI
52 select ARCH_SUPPORTS_ATOMIC_RMW
53 select ARCH_SUPPORTS_HUGETLBFS
54 select ARCH_SUPPORTS_LTO_CLANG
55 select ARCH_SUPPORTS_LTO_CLANG_THIN
56 select ARCH_SUPPORTS_NUMA_BALANCING
57 select ARCH_USE_BUILTIN_BSWAP
58 select ARCH_USE_CMPXCHG_LOCKREF
59 select ARCH_USE_QUEUED_RWLOCKS
60 select ARCH_USE_QUEUED_SPINLOCKS
61 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
62 select ARCH_WANT_LD_ORPHAN_WARN
63 select ARCH_WANT_OPTIMIZE_VMEMMAP
64 select ARCH_WANTS_NO_INSTR
65 select BUILDTIME_TABLE_SORT
69 select GENERIC_CLOCKEVENTS
70 select GENERIC_CMOS_UPDATE
71 select GENERIC_CPU_AUTOPROBE
73 select GENERIC_GETTIMEOFDAY
74 select GENERIC_IOREMAP if !ARCH_IOREMAP
75 select GENERIC_IRQ_MULTI_HANDLER
76 select GENERIC_IRQ_PROBE
77 select GENERIC_IRQ_SHOW
78 select GENERIC_LIB_ASHLDI3
79 select GENERIC_LIB_ASHRDI3
80 select GENERIC_LIB_CMPDI2
81 select GENERIC_LIB_LSHRDI3
82 select GENERIC_LIB_UCMPDI2
83 select GENERIC_LIB_DEVMEM_IS_ALLOWED
84 select GENERIC_PCI_IOMAP
85 select GENERIC_SCHED_CLOCK
86 select GENERIC_SMP_IDLE_THREAD
87 select GENERIC_TIME_VSYSCALL
88 select GENERIC_VDSO_TIME_NS
91 select HAVE_ARCH_AUDITSYSCALL
92 select HAVE_ARCH_JUMP_LABEL
93 select HAVE_ARCH_JUMP_LABEL_RELATIVE
94 select HAVE_ARCH_KGDB if PERF_EVENTS
95 select HAVE_ARCH_MMAP_RND_BITS if MMU
96 select HAVE_ARCH_SECCOMP_FILTER
97 select HAVE_ARCH_TRACEHOOK
98 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
99 select HAVE_ASM_MODVERSIONS
100 select HAVE_CONTEXT_TRACKING_USER
101 select HAVE_C_RECORDMCOUNT
102 select HAVE_DEBUG_KMEMLEAK
103 select HAVE_DEBUG_STACKOVERFLOW
104 select HAVE_DMA_CONTIGUOUS
105 select HAVE_DYNAMIC_FTRACE
106 select HAVE_DYNAMIC_FTRACE_WITH_ARGS
107 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
108 select HAVE_DYNAMIC_FTRACE_WITH_REGS
110 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !ARCH_STRICT_ALIGN
111 select HAVE_EXIT_THREAD
113 select HAVE_FTRACE_MCOUNT_RECORD
114 select HAVE_FUNCTION_ARG_ACCESS_API
115 select HAVE_FUNCTION_ERROR_INJECTION
116 select HAVE_FUNCTION_GRAPH_RETVAL if HAVE_FUNCTION_GRAPH_TRACER
117 select HAVE_FUNCTION_GRAPH_TRACER
118 select HAVE_FUNCTION_TRACER
119 select HAVE_GENERIC_VDSO
120 select HAVE_HW_BREAKPOINT if PERF_EVENTS
121 select HAVE_IOREMAP_PROT
122 select HAVE_IRQ_EXIT_ON_IRQ_STACK
123 select HAVE_IRQ_TIME_ACCOUNTING
125 select HAVE_KPROBES_ON_FTRACE
126 select HAVE_KRETPROBES
127 select HAVE_MOD_ARCH_SPECIFIC
130 select HAVE_PERF_EVENTS
131 select HAVE_PERF_REGS
132 select HAVE_PERF_USER_STACK_DUMP
133 select HAVE_REGS_AND_STACK_ACCESS_API
136 select HAVE_SAMPLE_FTRACE_DIRECT
137 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
138 select HAVE_SETUP_PER_CPU_AREA if NUMA
139 select HAVE_STACKPROTECTOR
140 select HAVE_SYSCALL_TRACEPOINTS
142 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP
143 select IRQ_FORCED_THREADING
144 select IRQ_LOONGARCH_CPU
145 select LOCK_MM_AND_FIND_VMA
146 select MMU_GATHER_MERGE_VMAS if MMU
147 select MODULES_USE_ELF_RELA if MODULES
148 select NEED_PER_CPU_EMBED_FIRST_CHUNK
149 select NEED_PER_CPU_PAGE_FIRST_CHUNK
151 select OF_EARLY_FLATTREE
153 select PCI_DOMAINS_GENERIC
154 select PCI_ECAM if ACPI
156 select PCI_MSI_ARCH_FALLBACKS
158 select PERF_USE_VMALLOC
162 select SYSCTL_ARCH_UNALIGN_ALLOW
163 select SYSCTL_ARCH_UNALIGN_NO_WARN
164 select SYSCTL_EXCEPTION_TRACE
166 select TRACE_IRQFLAGS_SUPPORT
167 select USE_PERCPU_NUMA_NODE_ID
168 select USER_STACKTRACE_SUPPORT
181 config GENERIC_BUG_RELATIVE_POINTERS
183 depends on GENERIC_BUG
185 config GENERIC_CALIBRATE_DELAY
191 config GENERIC_HWEIGHT
194 config L1_CACHE_SHIFT
198 config LOCKDEP_SUPPORT
202 config STACKTRACE_SUPPORT
206 # MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the
207 # MIPS Loongson code, to preserve Loongson-specific code paths in drivers that
208 # are shared between architectures, and specifically expecting the symbols.
209 config MACH_LOONGSON32
212 config MACH_LOONGSON64
215 config FIX_EARLYCON_MEM
221 config PAGE_SIZE_16KB
224 config PAGE_SIZE_64KB
227 config PGTABLE_2LEVEL
230 config PGTABLE_3LEVEL
233 config PGTABLE_4LEVEL
236 config PGTABLE_LEVELS
238 default 2 if PGTABLE_2LEVEL
239 default 3 if PGTABLE_3LEVEL
240 default 4 if PGTABLE_4LEVEL
242 config SCHED_OMIT_FRAME_POINTER
246 config AS_HAS_EXPLICIT_RELOCS
247 def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x))
249 config AS_HAS_FCSR_CLASS
250 def_bool $(as-instr,movfcsr2gr \$t0$(comma)\$fcsr0)
252 config AS_HAS_LSX_EXTENSION
253 def_bool $(as-instr,vld \$vr0$(comma)\$a0$(comma)0)
255 config AS_HAS_LASX_EXTENSION
256 def_bool $(as-instr,xvld \$xr0$(comma)\$a0$(comma)0)
258 config AS_HAS_LBT_EXTENSION
259 def_bool $(as-instr,movscr2gr \$a0$(comma)\$scr0)
261 menu "Kernel type and options"
263 source "kernel/Kconfig.hz"
266 prompt "Page Table Layout"
267 default 16KB_2LEVEL if 32BIT
268 default 16KB_3LEVEL if 64BIT
270 Allows choosing the page table layout, which is a combination
271 of page size and page table levels. The size of virtual memory
272 address space are determined by the page table layout.
275 bool "4KB with 3 levels"
277 select PGTABLE_3LEVEL
279 This option selects 4KB page size with 3 level page tables, which
280 support a maximum of 39 bits of application virtual memory.
283 bool "4KB with 4 levels"
285 select PGTABLE_4LEVEL
287 This option selects 4KB page size with 4 level page tables, which
288 support a maximum of 48 bits of application virtual memory.
291 bool "16KB with 2 levels"
292 select PAGE_SIZE_16KB
293 select PGTABLE_2LEVEL
295 This option selects 16KB page size with 2 level page tables, which
296 support a maximum of 36 bits of application virtual memory.
299 bool "16KB with 3 levels"
300 select PAGE_SIZE_16KB
301 select PGTABLE_3LEVEL
303 This option selects 16KB page size with 3 level page tables, which
304 support a maximum of 47 bits of application virtual memory.
307 bool "64KB with 2 levels"
308 select PAGE_SIZE_64KB
309 select PGTABLE_2LEVEL
311 This option selects 64KB page size with 2 level page tables, which
312 support a maximum of 42 bits of application virtual memory.
315 bool "64KB with 3 levels"
316 select PAGE_SIZE_64KB
317 select PGTABLE_3LEVEL
319 This option selects 64KB page size with 3 level page tables, which
320 support a maximum of 55 bits of application virtual memory.
325 string "Built-in kernel command line"
327 For most platforms, the arguments for the kernel's command line
328 are provided at run-time, during boot. However, there are cases
329 where either no arguments are being provided or the provided
330 arguments are insufficient or even invalid.
332 When that occurs, it is possible to define a built-in command
333 line here and choose how the kernel should use it later on.
336 prompt "Kernel command line type"
337 default CMDLINE_BOOTLOADER
339 Choose how the kernel will handle the provided built-in command
342 config CMDLINE_BOOTLOADER
343 bool "Use bootloader kernel arguments if available"
345 Prefer the command-line passed by the boot loader if available.
346 Use the built-in command line as fallback in case we get nothing
347 during boot. This is the default behaviour.
349 config CMDLINE_EXTEND
350 bool "Use built-in to extend bootloader kernel arguments"
352 The command-line arguments provided during boot will be
353 appended to the built-in command line. This is useful in
354 cases where the provided arguments are insufficient and
355 you don't want to or cannot modify them.
358 bool "Always use the built-in kernel command string"
360 Always use the built-in command line, even if we get one during
361 boot. This is useful in case you need to override the provided
362 command line on systems where you don't have or want control
368 bool "Enable DMI scanning"
369 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
372 This enables SMBIOS/DMI feature for systems, and scanning of
373 DMI to identify machine quirks.
376 bool "EFI runtime service support"
378 select EFI_RUNTIME_WRAPPERS
380 This enables the kernel to use EFI runtime services that are
381 available (such as the EFI variable services).
384 bool "EFI boot stub support"
387 select EFI_GENERIC_STUB
389 This kernel feature allows the kernel to be loaded directly by
390 EFI firmware without the use of a bootloader.
393 bool "SMT scheduler support"
396 Improves scheduler's performance when there are multiple
397 threads in one physical core.
400 bool "Multi-Processing support"
402 This enables support for systems with more than one CPU. If you have
403 a system with only one CPU, say N. If you have a system with more
406 If you say N here, the kernel will run on uni- and multiprocessor
407 machines, but will use only one CPU of a multiprocessor machine. If
408 you say Y here, the kernel will run on many, but not all,
409 uniprocessor machines. On a uniprocessor machine, the kernel
410 will run faster if you say N here.
412 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>.
414 If you don't know what to do here, say N.
417 bool "Support for hot-pluggable CPUs"
419 select GENERIC_IRQ_MIGRATION
421 Say Y here to allow turning CPUs off and on. CPUs can be
422 controlled through /sys/devices/system/cpu.
423 (Note: power management support will enable this option
424 automatically on SMP systems. )
425 Say N if you want to disable CPU hotplug.
428 int "Maximum number of CPUs (2-256)"
433 This allows you to specify the maximum number of CPUs which this
439 select ACPI_NUMA if ACPI
441 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access)
442 support. This option improves performance on systems with more
443 than one NUMA node; on single node systems it is generally better
444 to leave it disabled.
451 config ARCH_FORCE_MAX_ORDER
452 int "Maximum zone order"
453 default "13" if PAGE_SIZE_64KB
454 default "11" if PAGE_SIZE_16KB
457 The kernel memory allocator divides physically contiguous memory
458 blocks into "zones", where each zone is a power of two number of
459 pages. This option selects the largest power of two that the kernel
460 keeps in the memory allocator. If you need to allocate very large
461 blocks of physically contiguous memory, then you may need to
464 The page size is not necessarily 4KB. Keep this in mind
465 when choosing a value for this option.
468 bool "Enable LoongArch DMW-based ioremap()"
470 We use generic TLB-based ioremap() by default since it has page
471 protection support. However, you can enable LoongArch DMW-based
472 ioremap() for better performance.
474 config ARCH_WRITECOMBINE
475 bool "Enable WriteCombine (WUC) for ioremap()"
477 LoongArch maintains cache coherency in hardware, but when paired
478 with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which
479 is similar to WriteCombine) is out of the scope of cache coherency
480 machanism for PCIe devices (this is a PCIe protocol violation, which
481 may be fixed in newer chipsets).
483 This means WUC can only used for write-only memory regions now, so
484 this option is disabled by default, making WUC silently fallback to
485 SUC for ioremap(). You can enable this option if the kernel is ensured
486 to run on hardware without this bug.
488 You can override this setting via writecombine=on/off boot parameter.
490 config ARCH_STRICT_ALIGN
491 bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT
494 Not all LoongArch cores support h/w unaligned access, we can use
495 -mstrict-align build parameter to prevent unaligned accesses.
497 CPUs with h/w unaligned access support:
498 Loongson-2K2000/2K3000/3A5000/3C5000/3D5000.
500 CPUs without h/w unaligned access support:
501 Loongson-2K500/2K1000.
503 This option is enabled by default to make the kernel be able to run
504 on all LoongArch systems. But you can disable it manually if you want
505 to run kernel only on systems with h/w unaligned access support in
506 order to optimise for performance.
513 bool "Support for the Loongson SIMD Extension"
514 depends on AS_HAS_LSX_EXTENSION
516 Loongson SIMD Extension (LSX) introduces 128 bit wide vector registers
517 and a set of SIMD instructions to operate on them. When this option
518 is enabled the kernel will support allocating & switching LSX
519 vector register contexts. If you know that your kernel will only be
520 running on CPUs which do not support LSX or that your userland will
521 not be making use of it then you may wish to say N here to reduce
522 the size & complexity of your kernel.
527 bool "Support for the Loongson Advanced SIMD Extension"
528 depends on CPU_HAS_LSX
529 depends on AS_HAS_LASX_EXTENSION
531 Loongson Advanced SIMD Extension (LASX) introduces 256 bit wide vector
532 registers and a set of SIMD instructions to operate on them. When this
533 option is enabled the kernel will support allocating & switching LASX
534 vector register contexts. If you know that your kernel will only be
535 running on CPUs which do not support LASX or that your userland will
536 not be making use of it then you may wish to say N here to reduce
537 the size & complexity of your kernel.
542 bool "Support for the Loongson Binary Translation Extension"
543 depends on AS_HAS_LBT_EXTENSION
545 Loongson Binary Translation (LBT) introduces 4 scratch registers (SCR0
546 to SCR3), x86/ARM eflags (eflags) and x87 fpu stack pointer (ftop).
547 Enabling this option allows the kernel to allocate and switch registers
550 If you want to use this feature, such as the Loongson Architecture
551 Translator (LAT), say Y.
553 config CPU_HAS_PREFETCH
558 bool "Kexec system call"
561 kexec is a system call that implements the ability to shutdown your
562 current kernel, and to start another kernel. It is like a reboot
563 but it is independent of the system firmware. And like a reboot
564 you can start any kernel with it, not just Linux.
566 The name comes from the similarity to the exec system call.
569 bool "Build kdump crash kernel"
572 Generate crash dump after being started by kexec. This should
573 be normally only set in special crash dump kernels which are
574 loaded in the main kernel with kexec-tools into a specially
575 reserved region and then later executed after a crash by
578 For more details see Documentation/admin-guide/kdump/kdump.rst
581 bool "Relocatable kernel"
583 This builds the kernel as a Position Independent Executable (PIE),
584 which retains all relocation metadata required, so as to relocate
585 the kernel binary at runtime to a different virtual address from
588 config RANDOMIZE_BASE
589 bool "Randomize the address of the kernel (KASLR)"
590 depends on RELOCATABLE
592 Randomizes the physical and virtual address at which the
593 kernel image is loaded, as a security feature that
594 deters exploit attempts relying on knowledge of the location
597 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET.
601 config RANDOMIZE_BASE_MAX_OFFSET
602 hex "Maximum KASLR offset" if EXPERT
603 depends on RANDOMIZE_BASE
607 When KASLR is active, this provides the maximum offset that will
608 be applied to the kernel image. It should be set according to the
609 amount of physical RAM available in the target system.
611 This is limited by the size of the lower address memory, 256MB.
614 bool "Enable seccomp to safely compute untrusted bytecode"
618 This kernel feature is useful for number crunching applications
619 that may need to compute untrusted bytecode during their
620 execution. By using pipes or other transports made available to
621 the process as file descriptors supporting the read/write
622 syscalls, it's possible to isolate those applications in
623 their own address space using seccomp. Once seccomp is
624 enabled via /proc/<pid>/seccomp, it cannot be disabled
625 and the task is only allowed to execute a few safe syscalls
626 defined by each seccomp mode.
628 If unsure, say Y. Only embedded should say N here.
632 config ARCH_SELECT_MEMORY_MODEL
635 config ARCH_FLATMEM_ENABLE
639 config ARCH_SPARSEMEM_ENABLE
641 select SPARSEMEM_VMEMMAP_ENABLE
643 Say Y to support efficient handling of sparse physical memory,
644 for architectures which are either NUMA (Non-Uniform Memory Access)
645 or have huge holes in the physical address space for other reasons.
646 See <file:Documentation/mm/numa.rst> for more.
648 config ARCH_ENABLE_THP_MIGRATION
650 depends on TRANSPARENT_HUGEPAGE
652 config ARCH_MEMORY_PROBE
654 depends on MEMORY_HOTPLUG
660 config ARCH_MMAP_RND_BITS_MIN
663 config ARCH_MMAP_RND_BITS_MAX
666 config ARCH_SUPPORTS_UPROBES
669 menu "Power management options"
671 config ARCH_SUSPEND_POSSIBLE
674 config ARCH_HIBERNATION_POSSIBLE
677 source "kernel/power/Kconfig"
678 source "drivers/acpi/Kconfig"