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_MMAP_RND_BITS if MMU
95 select HAVE_ARCH_SECCOMP_FILTER
96 select HAVE_ARCH_TRACEHOOK
97 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
98 select HAVE_ASM_MODVERSIONS
99 select HAVE_CONTEXT_TRACKING_USER
100 select HAVE_C_RECORDMCOUNT
101 select HAVE_DEBUG_KMEMLEAK
102 select HAVE_DEBUG_STACKOVERFLOW
103 select HAVE_DMA_CONTIGUOUS
104 select HAVE_DYNAMIC_FTRACE
105 select HAVE_DYNAMIC_FTRACE_WITH_ARGS
106 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
107 select HAVE_DYNAMIC_FTRACE_WITH_REGS
109 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !ARCH_STRICT_ALIGN
110 select HAVE_EXIT_THREAD
112 select HAVE_FTRACE_MCOUNT_RECORD
113 select HAVE_FUNCTION_ARG_ACCESS_API
114 select HAVE_FUNCTION_ERROR_INJECTION
115 select HAVE_FUNCTION_GRAPH_RETVAL if HAVE_FUNCTION_GRAPH_TRACER
116 select HAVE_FUNCTION_GRAPH_TRACER
117 select HAVE_FUNCTION_TRACER
118 select HAVE_GENERIC_VDSO
119 select HAVE_HW_BREAKPOINT if PERF_EVENTS
120 select HAVE_IOREMAP_PROT
121 select HAVE_IRQ_EXIT_ON_IRQ_STACK
122 select HAVE_IRQ_TIME_ACCOUNTING
124 select HAVE_KPROBES_ON_FTRACE
125 select HAVE_KRETPROBES
126 select HAVE_MOD_ARCH_SPECIFIC
129 select HAVE_PERF_EVENTS
130 select HAVE_PERF_REGS
131 select HAVE_PERF_USER_STACK_DUMP
132 select HAVE_REGS_AND_STACK_ACCESS_API
135 select HAVE_SAMPLE_FTRACE_DIRECT
136 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
137 select HAVE_SETUP_PER_CPU_AREA if NUMA
138 select HAVE_STACKPROTECTOR
139 select HAVE_SYSCALL_TRACEPOINTS
141 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP
142 select IRQ_FORCED_THREADING
143 select IRQ_LOONGARCH_CPU
144 select LOCK_MM_AND_FIND_VMA
145 select MMU_GATHER_MERGE_VMAS if MMU
146 select MODULES_USE_ELF_RELA if MODULES
147 select NEED_PER_CPU_EMBED_FIRST_CHUNK
148 select NEED_PER_CPU_PAGE_FIRST_CHUNK
150 select OF_EARLY_FLATTREE
152 select PCI_DOMAINS_GENERIC
153 select PCI_ECAM if ACPI
155 select PCI_MSI_ARCH_FALLBACKS
157 select PERF_USE_VMALLOC
161 select SYSCTL_ARCH_UNALIGN_ALLOW
162 select SYSCTL_ARCH_UNALIGN_NO_WARN
163 select SYSCTL_EXCEPTION_TRACE
165 select TRACE_IRQFLAGS_SUPPORT
166 select USE_PERCPU_NUMA_NODE_ID
167 select USER_STACKTRACE_SUPPORT
180 config GENERIC_BUG_RELATIVE_POINTERS
182 depends on GENERIC_BUG
184 config GENERIC_CALIBRATE_DELAY
190 config GENERIC_HWEIGHT
193 config L1_CACHE_SHIFT
197 config LOCKDEP_SUPPORT
201 config STACKTRACE_SUPPORT
205 # MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the
206 # MIPS Loongson code, to preserve Loongson-specific code paths in drivers that
207 # are shared between architectures, and specifically expecting the symbols.
208 config MACH_LOONGSON32
211 config MACH_LOONGSON64
214 config FIX_EARLYCON_MEM
220 config PAGE_SIZE_16KB
223 config PAGE_SIZE_64KB
226 config PGTABLE_2LEVEL
229 config PGTABLE_3LEVEL
232 config PGTABLE_4LEVEL
235 config PGTABLE_LEVELS
237 default 2 if PGTABLE_2LEVEL
238 default 3 if PGTABLE_3LEVEL
239 default 4 if PGTABLE_4LEVEL
241 config SCHED_OMIT_FRAME_POINTER
245 config AS_HAS_EXPLICIT_RELOCS
246 def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x))
248 config AS_HAS_FCSR_CLASS
249 def_bool $(as-instr,movfcsr2gr \$t0$(comma)\$fcsr0)
251 config AS_HAS_LSX_EXTENSION
252 def_bool $(as-instr,vld \$vr0$(comma)\$a0$(comma)0)
254 config AS_HAS_LASX_EXTENSION
255 def_bool $(as-instr,xvld \$xr0$(comma)\$a0$(comma)0)
257 config AS_HAS_LBT_EXTENSION
258 def_bool $(as-instr,movscr2gr \$a0$(comma)\$scr0)
260 menu "Kernel type and options"
262 source "kernel/Kconfig.hz"
265 prompt "Page Table Layout"
266 default 16KB_2LEVEL if 32BIT
267 default 16KB_3LEVEL if 64BIT
269 Allows choosing the page table layout, which is a combination
270 of page size and page table levels. The size of virtual memory
271 address space are determined by the page table layout.
274 bool "4KB with 3 levels"
276 select PGTABLE_3LEVEL
278 This option selects 4KB page size with 3 level page tables, which
279 support a maximum of 39 bits of application virtual memory.
282 bool "4KB with 4 levels"
284 select PGTABLE_4LEVEL
286 This option selects 4KB page size with 4 level page tables, which
287 support a maximum of 48 bits of application virtual memory.
290 bool "16KB with 2 levels"
291 select PAGE_SIZE_16KB
292 select PGTABLE_2LEVEL
294 This option selects 16KB page size with 2 level page tables, which
295 support a maximum of 36 bits of application virtual memory.
298 bool "16KB with 3 levels"
299 select PAGE_SIZE_16KB
300 select PGTABLE_3LEVEL
302 This option selects 16KB page size with 3 level page tables, which
303 support a maximum of 47 bits of application virtual memory.
306 bool "64KB with 2 levels"
307 select PAGE_SIZE_64KB
308 select PGTABLE_2LEVEL
310 This option selects 64KB page size with 2 level page tables, which
311 support a maximum of 42 bits of application virtual memory.
314 bool "64KB with 3 levels"
315 select PAGE_SIZE_64KB
316 select PGTABLE_3LEVEL
318 This option selects 64KB page size with 3 level page tables, which
319 support a maximum of 55 bits of application virtual memory.
324 string "Built-in kernel command line"
326 For most platforms, the arguments for the kernel's command line
327 are provided at run-time, during boot. However, there are cases
328 where either no arguments are being provided or the provided
329 arguments are insufficient or even invalid.
331 When that occurs, it is possible to define a built-in command
332 line here and choose how the kernel should use it later on.
335 prompt "Kernel command line type"
336 default CMDLINE_BOOTLOADER
338 Choose how the kernel will handle the provided built-in command
341 config CMDLINE_BOOTLOADER
342 bool "Use bootloader kernel arguments if available"
344 Prefer the command-line passed by the boot loader if available.
345 Use the built-in command line as fallback in case we get nothing
346 during boot. This is the default behaviour.
348 config CMDLINE_EXTEND
349 bool "Use built-in to extend bootloader kernel arguments"
351 The command-line arguments provided during boot will be
352 appended to the built-in command line. This is useful in
353 cases where the provided arguments are insufficient and
354 you don't want to or cannot modify them.
357 bool "Always use the built-in kernel command string"
359 Always use the built-in command line, even if we get one during
360 boot. This is useful in case you need to override the provided
361 command line on systems where you don't have or want control
367 bool "Enable DMI scanning"
368 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
371 This enables SMBIOS/DMI feature for systems, and scanning of
372 DMI to identify machine quirks.
375 bool "EFI runtime service support"
377 select EFI_RUNTIME_WRAPPERS
379 This enables the kernel to use EFI runtime services that are
380 available (such as the EFI variable services).
383 bool "EFI boot stub support"
386 select EFI_GENERIC_STUB
388 This kernel feature allows the kernel to be loaded directly by
389 EFI firmware without the use of a bootloader.
392 bool "SMT scheduler support"
395 Improves scheduler's performance when there are multiple
396 threads in one physical core.
399 bool "Multi-Processing support"
401 This enables support for systems with more than one CPU. If you have
402 a system with only one CPU, say N. If you have a system with more
405 If you say N here, the kernel will run on uni- and multiprocessor
406 machines, but will use only one CPU of a multiprocessor machine. If
407 you say Y here, the kernel will run on many, but not all,
408 uniprocessor machines. On a uniprocessor machine, the kernel
409 will run faster if you say N here.
411 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>.
413 If you don't know what to do here, say N.
416 bool "Support for hot-pluggable CPUs"
418 select GENERIC_IRQ_MIGRATION
420 Say Y here to allow turning CPUs off and on. CPUs can be
421 controlled through /sys/devices/system/cpu.
422 (Note: power management support will enable this option
423 automatically on SMP systems. )
424 Say N if you want to disable CPU hotplug.
427 int "Maximum number of CPUs (2-256)"
432 This allows you to specify the maximum number of CPUs which this
438 select ACPI_NUMA if ACPI
440 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access)
441 support. This option improves performance on systems with more
442 than one NUMA node; on single node systems it is generally better
443 to leave it disabled.
450 config ARCH_FORCE_MAX_ORDER
451 int "Maximum zone order"
452 default "13" if PAGE_SIZE_64KB
453 default "11" if PAGE_SIZE_16KB
456 The kernel memory allocator divides physically contiguous memory
457 blocks into "zones", where each zone is a power of two number of
458 pages. This option selects the largest power of two that the kernel
459 keeps in the memory allocator. If you need to allocate very large
460 blocks of physically contiguous memory, then you may need to
463 The page size is not necessarily 4KB. Keep this in mind
464 when choosing a value for this option.
467 bool "Enable LoongArch DMW-based ioremap()"
469 We use generic TLB-based ioremap() by default since it has page
470 protection support. However, you can enable LoongArch DMW-based
471 ioremap() for better performance.
473 config ARCH_WRITECOMBINE
474 bool "Enable WriteCombine (WUC) for ioremap()"
476 LoongArch maintains cache coherency in hardware, but when paired
477 with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which
478 is similar to WriteCombine) is out of the scope of cache coherency
479 machanism for PCIe devices (this is a PCIe protocol violation, which
480 may be fixed in newer chipsets).
482 This means WUC can only used for write-only memory regions now, so
483 this option is disabled by default, making WUC silently fallback to
484 SUC for ioremap(). You can enable this option if the kernel is ensured
485 to run on hardware without this bug.
487 You can override this setting via writecombine=on/off boot parameter.
489 config ARCH_STRICT_ALIGN
490 bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT
493 Not all LoongArch cores support h/w unaligned access, we can use
494 -mstrict-align build parameter to prevent unaligned accesses.
496 CPUs with h/w unaligned access support:
497 Loongson-2K2000/2K3000/3A5000/3C5000/3D5000.
499 CPUs without h/w unaligned access support:
500 Loongson-2K500/2K1000.
502 This option is enabled by default to make the kernel be able to run
503 on all LoongArch systems. But you can disable it manually if you want
504 to run kernel only on systems with h/w unaligned access support in
505 order to optimise for performance.
512 bool "Support for the Loongson SIMD Extension"
513 depends on AS_HAS_LSX_EXTENSION
515 Loongson SIMD Extension (LSX) introduces 128 bit wide vector registers
516 and a set of SIMD instructions to operate on them. When this option
517 is enabled the kernel will support allocating & switching LSX
518 vector register contexts. If you know that your kernel will only be
519 running on CPUs which do not support LSX or that your userland will
520 not be making use of it then you may wish to say N here to reduce
521 the size & complexity of your kernel.
526 bool "Support for the Loongson Advanced SIMD Extension"
527 depends on CPU_HAS_LSX
528 depends on AS_HAS_LASX_EXTENSION
530 Loongson Advanced SIMD Extension (LASX) introduces 256 bit wide vector
531 registers and a set of SIMD instructions to operate on them. When this
532 option is enabled the kernel will support allocating & switching LASX
533 vector register contexts. If you know that your kernel will only be
534 running on CPUs which do not support LASX or that your userland will
535 not be making use of it then you may wish to say N here to reduce
536 the size & complexity of your kernel.
541 bool "Support for the Loongson Binary Translation Extension"
542 depends on AS_HAS_LBT_EXTENSION
544 Loongson Binary Translation (LBT) introduces 4 scratch registers (SCR0
545 to SCR3), x86/ARM eflags (eflags) and x87 fpu stack pointer (ftop).
546 Enabling this option allows the kernel to allocate and switch registers
549 If you want to use this feature, such as the Loongson Architecture
550 Translator (LAT), say Y.
552 config CPU_HAS_PREFETCH
557 bool "Kexec system call"
560 kexec is a system call that implements the ability to shutdown your
561 current kernel, and to start another kernel. It is like a reboot
562 but it is independent of the system firmware. And like a reboot
563 you can start any kernel with it, not just Linux.
565 The name comes from the similarity to the exec system call.
568 bool "Build kdump crash kernel"
571 Generate crash dump after being started by kexec. This should
572 be normally only set in special crash dump kernels which are
573 loaded in the main kernel with kexec-tools into a specially
574 reserved region and then later executed after a crash by
577 For more details see Documentation/admin-guide/kdump/kdump.rst
580 bool "Relocatable kernel"
582 This builds the kernel as a Position Independent Executable (PIE),
583 which retains all relocation metadata required, so as to relocate
584 the kernel binary at runtime to a different virtual address from
587 config RANDOMIZE_BASE
588 bool "Randomize the address of the kernel (KASLR)"
589 depends on RELOCATABLE
591 Randomizes the physical and virtual address at which the
592 kernel image is loaded, as a security feature that
593 deters exploit attempts relying on knowledge of the location
596 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET.
600 config RANDOMIZE_BASE_MAX_OFFSET
601 hex "Maximum KASLR offset" if EXPERT
602 depends on RANDOMIZE_BASE
606 When KASLR is active, this provides the maximum offset that will
607 be applied to the kernel image. It should be set according to the
608 amount of physical RAM available in the target system.
610 This is limited by the size of the lower address memory, 256MB.
613 bool "Enable seccomp to safely compute untrusted bytecode"
617 This kernel feature is useful for number crunching applications
618 that may need to compute untrusted bytecode during their
619 execution. By using pipes or other transports made available to
620 the process as file descriptors supporting the read/write
621 syscalls, it's possible to isolate those applications in
622 their own address space using seccomp. Once seccomp is
623 enabled via /proc/<pid>/seccomp, it cannot be disabled
624 and the task is only allowed to execute a few safe syscalls
625 defined by each seccomp mode.
627 If unsure, say Y. Only embedded should say N here.
631 config ARCH_SELECT_MEMORY_MODEL
634 config ARCH_FLATMEM_ENABLE
638 config ARCH_SPARSEMEM_ENABLE
640 select SPARSEMEM_VMEMMAP_ENABLE
642 Say Y to support efficient handling of sparse physical memory,
643 for architectures which are either NUMA (Non-Uniform Memory Access)
644 or have huge holes in the physical address space for other reasons.
645 See <file:Documentation/mm/numa.rst> for more.
647 config ARCH_ENABLE_THP_MIGRATION
649 depends on TRANSPARENT_HUGEPAGE
651 config ARCH_MEMORY_PROBE
653 depends on MEMORY_HOTPLUG
659 config ARCH_MMAP_RND_BITS_MIN
662 config ARCH_MMAP_RND_BITS_MAX
665 config ARCH_SUPPORTS_UPROBES
668 menu "Power management options"
670 config ARCH_SUSPEND_POSSIBLE
673 config ARCH_HIBERNATION_POSSIBLE
676 source "kernel/power/Kconfig"
677 source "drivers/acpi/Kconfig"