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
17 select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
18 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
19 select ARCH_HAS_PTE_SPECIAL
20 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
21 select ARCH_INLINE_READ_LOCK if !PREEMPTION
22 select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION
23 select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION
24 select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION
25 select ARCH_INLINE_READ_UNLOCK if !PREEMPTION
26 select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION
27 select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION
28 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION
29 select ARCH_INLINE_WRITE_LOCK if !PREEMPTION
30 select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION
31 select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION
32 select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION
33 select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION
34 select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION
35 select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION
36 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION
37 select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION
38 select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION
39 select ARCH_INLINE_SPIN_LOCK if !PREEMPTION
40 select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION
41 select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION
42 select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION
43 select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION
44 select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION
45 select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION
46 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION
47 select ARCH_KEEP_MEMBLOCK
48 select ARCH_MIGHT_HAVE_PC_PARPORT
49 select ARCH_MIGHT_HAVE_PC_SERIO
50 select ARCH_SPARSEMEM_ENABLE
52 select ARCH_SUPPORTS_ACPI
53 select ARCH_SUPPORTS_ATOMIC_RMW
54 select ARCH_SUPPORTS_HUGETLBFS
55 select ARCH_SUPPORTS_LTO_CLANG
56 select ARCH_SUPPORTS_LTO_CLANG_THIN
57 select ARCH_SUPPORTS_NUMA_BALANCING
58 select ARCH_USE_BUILTIN_BSWAP
59 select ARCH_USE_CMPXCHG_LOCKREF
60 select ARCH_USE_QUEUED_RWLOCKS
61 select ARCH_USE_QUEUED_SPINLOCKS
62 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
63 select ARCH_WANT_LD_ORPHAN_WARN
64 select ARCH_WANT_OPTIMIZE_VMEMMAP
65 select ARCH_WANTS_NO_INSTR
66 select BUILDTIME_TABLE_SORT
70 select GENERIC_CLOCKEVENTS
71 select GENERIC_CMOS_UPDATE
72 select GENERIC_CPU_AUTOPROBE
74 select GENERIC_GETTIMEOFDAY
75 select GENERIC_IOREMAP if !ARCH_IOREMAP
76 select GENERIC_IRQ_MULTI_HANDLER
77 select GENERIC_IRQ_PROBE
78 select GENERIC_IRQ_SHOW
79 select GENERIC_LIB_ASHLDI3
80 select GENERIC_LIB_ASHRDI3
81 select GENERIC_LIB_CMPDI2
82 select GENERIC_LIB_LSHRDI3
83 select GENERIC_LIB_UCMPDI2
84 select GENERIC_LIB_DEVMEM_IS_ALLOWED
85 select GENERIC_PCI_IOMAP
86 select GENERIC_SCHED_CLOCK
87 select GENERIC_SMP_IDLE_THREAD
88 select GENERIC_TIME_VSYSCALL
89 select GENERIC_VDSO_TIME_NS
92 select HAVE_ARCH_AUDITSYSCALL
93 select HAVE_ARCH_JUMP_LABEL
94 select HAVE_ARCH_JUMP_LABEL_RELATIVE
95 select HAVE_ARCH_KFENCE
96 select HAVE_ARCH_KGDB if PERF_EVENTS
97 select HAVE_ARCH_MMAP_RND_BITS if MMU
98 select HAVE_ARCH_SECCOMP_FILTER
99 select HAVE_ARCH_TRACEHOOK
100 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
101 select HAVE_ASM_MODVERSIONS
102 select HAVE_CONTEXT_TRACKING_USER
103 select HAVE_C_RECORDMCOUNT
104 select HAVE_DEBUG_KMEMLEAK
105 select HAVE_DEBUG_STACKOVERFLOW
106 select HAVE_DMA_CONTIGUOUS
107 select HAVE_DYNAMIC_FTRACE
108 select HAVE_DYNAMIC_FTRACE_WITH_ARGS
109 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
110 select HAVE_DYNAMIC_FTRACE_WITH_REGS
112 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !ARCH_STRICT_ALIGN
113 select HAVE_EXIT_THREAD
115 select HAVE_FTRACE_MCOUNT_RECORD
116 select HAVE_FUNCTION_ARG_ACCESS_API
117 select HAVE_FUNCTION_ERROR_INJECTION
118 select HAVE_FUNCTION_GRAPH_RETVAL if HAVE_FUNCTION_GRAPH_TRACER
119 select HAVE_FUNCTION_GRAPH_TRACER
120 select HAVE_FUNCTION_TRACER
121 select HAVE_GCC_PLUGINS
122 select HAVE_GENERIC_VDSO
123 select HAVE_HW_BREAKPOINT if PERF_EVENTS
124 select HAVE_IOREMAP_PROT
125 select HAVE_IRQ_EXIT_ON_IRQ_STACK
126 select HAVE_IRQ_TIME_ACCOUNTING
128 select HAVE_KPROBES_ON_FTRACE
129 select HAVE_KRETPROBES
130 select HAVE_MOD_ARCH_SPECIFIC
133 select HAVE_PERF_EVENTS
134 select HAVE_PERF_REGS
135 select HAVE_PERF_USER_STACK_DUMP
136 select HAVE_REGS_AND_STACK_ACCESS_API
139 select HAVE_SAMPLE_FTRACE_DIRECT
140 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
141 select HAVE_SETUP_PER_CPU_AREA if NUMA
142 select HAVE_STACKPROTECTOR
143 select HAVE_SYSCALL_TRACEPOINTS
145 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP
146 select IRQ_FORCED_THREADING
147 select IRQ_LOONGARCH_CPU
148 select LOCK_MM_AND_FIND_VMA
149 select MMU_GATHER_MERGE_VMAS if MMU
150 select MODULES_USE_ELF_RELA if MODULES
151 select NEED_PER_CPU_EMBED_FIRST_CHUNK
152 select NEED_PER_CPU_PAGE_FIRST_CHUNK
154 select OF_EARLY_FLATTREE
156 select PCI_DOMAINS_GENERIC
157 select PCI_ECAM if ACPI
159 select PCI_MSI_ARCH_FALLBACKS
161 select PERF_USE_VMALLOC
165 select SYSCTL_ARCH_UNALIGN_ALLOW
166 select SYSCTL_ARCH_UNALIGN_NO_WARN
167 select SYSCTL_EXCEPTION_TRACE
169 select TRACE_IRQFLAGS_SUPPORT
170 select USE_PERCPU_NUMA_NODE_ID
171 select USER_STACKTRACE_SUPPORT
184 config GENERIC_BUG_RELATIVE_POINTERS
186 depends on GENERIC_BUG
188 config GENERIC_CALIBRATE_DELAY
194 config GENERIC_HWEIGHT
197 config L1_CACHE_SHIFT
201 config LOCKDEP_SUPPORT
205 config STACKTRACE_SUPPORT
209 # MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the
210 # MIPS Loongson code, to preserve Loongson-specific code paths in drivers that
211 # are shared between architectures, and specifically expecting the symbols.
212 config MACH_LOONGSON32
215 config MACH_LOONGSON64
218 config FIX_EARLYCON_MEM
224 config PAGE_SIZE_16KB
227 config PAGE_SIZE_64KB
230 config PGTABLE_2LEVEL
233 config PGTABLE_3LEVEL
236 config PGTABLE_4LEVEL
239 config PGTABLE_LEVELS
241 default 2 if PGTABLE_2LEVEL
242 default 3 if PGTABLE_3LEVEL
243 default 4 if PGTABLE_4LEVEL
245 config SCHED_OMIT_FRAME_POINTER
249 config AS_HAS_EXPLICIT_RELOCS
250 def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x))
252 config AS_HAS_FCSR_CLASS
253 def_bool $(as-instr,movfcsr2gr \$t0$(comma)\$fcsr0)
255 config AS_HAS_LSX_EXTENSION
256 def_bool $(as-instr,vld \$vr0$(comma)\$a0$(comma)0)
258 config AS_HAS_LASX_EXTENSION
259 def_bool $(as-instr,xvld \$xr0$(comma)\$a0$(comma)0)
261 config AS_HAS_LBT_EXTENSION
262 def_bool $(as-instr,movscr2gr \$a0$(comma)\$scr0)
264 menu "Kernel type and options"
266 source "kernel/Kconfig.hz"
269 prompt "Page Table Layout"
270 default 16KB_2LEVEL if 32BIT
271 default 16KB_3LEVEL if 64BIT
273 Allows choosing the page table layout, which is a combination
274 of page size and page table levels. The size of virtual memory
275 address space are determined by the page table layout.
278 bool "4KB with 3 levels"
280 select PGTABLE_3LEVEL
282 This option selects 4KB page size with 3 level page tables, which
283 support a maximum of 39 bits of application virtual memory.
286 bool "4KB with 4 levels"
288 select PGTABLE_4LEVEL
290 This option selects 4KB page size with 4 level page tables, which
291 support a maximum of 48 bits of application virtual memory.
294 bool "16KB with 2 levels"
295 select PAGE_SIZE_16KB
296 select PGTABLE_2LEVEL
298 This option selects 16KB page size with 2 level page tables, which
299 support a maximum of 36 bits of application virtual memory.
302 bool "16KB with 3 levels"
303 select PAGE_SIZE_16KB
304 select PGTABLE_3LEVEL
306 This option selects 16KB page size with 3 level page tables, which
307 support a maximum of 47 bits of application virtual memory.
310 bool "64KB with 2 levels"
311 select PAGE_SIZE_64KB
312 select PGTABLE_2LEVEL
314 This option selects 64KB page size with 2 level page tables, which
315 support a maximum of 42 bits of application virtual memory.
318 bool "64KB with 3 levels"
319 select PAGE_SIZE_64KB
320 select PGTABLE_3LEVEL
322 This option selects 64KB page size with 3 level page tables, which
323 support a maximum of 55 bits of application virtual memory.
328 string "Built-in kernel command line"
330 For most platforms, the arguments for the kernel's command line
331 are provided at run-time, during boot. However, there are cases
332 where either no arguments are being provided or the provided
333 arguments are insufficient or even invalid.
335 When that occurs, it is possible to define a built-in command
336 line here and choose how the kernel should use it later on.
339 prompt "Kernel command line type"
340 default CMDLINE_BOOTLOADER
342 Choose how the kernel will handle the provided built-in command
345 config CMDLINE_BOOTLOADER
346 bool "Use bootloader kernel arguments if available"
348 Prefer the command-line passed by the boot loader if available.
349 Use the built-in command line as fallback in case we get nothing
350 during boot. This is the default behaviour.
352 config CMDLINE_EXTEND
353 bool "Use built-in to extend bootloader kernel arguments"
355 The command-line arguments provided during boot will be
356 appended to the built-in command line. This is useful in
357 cases where the provided arguments are insufficient and
358 you don't want to or cannot modify them.
361 bool "Always use the built-in kernel command string"
363 Always use the built-in command line, even if we get one during
364 boot. This is useful in case you need to override the provided
365 command line on systems where you don't have or want control
371 bool "Enable DMI scanning"
372 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
375 This enables SMBIOS/DMI feature for systems, and scanning of
376 DMI to identify machine quirks.
379 bool "EFI runtime service support"
381 select EFI_RUNTIME_WRAPPERS
383 This enables the kernel to use EFI runtime services that are
384 available (such as the EFI variable services).
387 bool "EFI boot stub support"
390 select EFI_GENERIC_STUB
392 This kernel feature allows the kernel to be loaded directly by
393 EFI firmware without the use of a bootloader.
396 bool "SMT scheduler support"
399 Improves scheduler's performance when there are multiple
400 threads in one physical core.
403 bool "Multi-Processing support"
405 This enables support for systems with more than one CPU. If you have
406 a system with only one CPU, say N. If you have a system with more
409 If you say N here, the kernel will run on uni- and multiprocessor
410 machines, but will use only one CPU of a multiprocessor machine. If
411 you say Y here, the kernel will run on many, but not all,
412 uniprocessor machines. On a uniprocessor machine, the kernel
413 will run faster if you say N here.
415 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>.
417 If you don't know what to do here, say N.
420 bool "Support for hot-pluggable CPUs"
422 select GENERIC_IRQ_MIGRATION
424 Say Y here to allow turning CPUs off and on. CPUs can be
425 controlled through /sys/devices/system/cpu.
426 (Note: power management support will enable this option
427 automatically on SMP systems. )
428 Say N if you want to disable CPU hotplug.
431 int "Maximum number of CPUs (2-256)"
436 This allows you to specify the maximum number of CPUs which this
442 select ACPI_NUMA if ACPI
444 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access)
445 support. This option improves performance on systems with more
446 than one NUMA node; on single node systems it is generally better
447 to leave it disabled.
454 config ARCH_FORCE_MAX_ORDER
455 int "Maximum zone order"
456 default "13" if PAGE_SIZE_64KB
457 default "11" if PAGE_SIZE_16KB
460 The kernel memory allocator divides physically contiguous memory
461 blocks into "zones", where each zone is a power of two number of
462 pages. This option selects the largest power of two that the kernel
463 keeps in the memory allocator. If you need to allocate very large
464 blocks of physically contiguous memory, then you may need to
467 The page size is not necessarily 4KB. Keep this in mind
468 when choosing a value for this option.
471 bool "Enable LoongArch DMW-based ioremap()"
473 We use generic TLB-based ioremap() by default since it has page
474 protection support. However, you can enable LoongArch DMW-based
475 ioremap() for better performance.
477 config ARCH_WRITECOMBINE
478 bool "Enable WriteCombine (WUC) for ioremap()"
480 LoongArch maintains cache coherency in hardware, but when paired
481 with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which
482 is similar to WriteCombine) is out of the scope of cache coherency
483 machanism for PCIe devices (this is a PCIe protocol violation, which
484 may be fixed in newer chipsets).
486 This means WUC can only used for write-only memory regions now, so
487 this option is disabled by default, making WUC silently fallback to
488 SUC for ioremap(). You can enable this option if the kernel is ensured
489 to run on hardware without this bug.
491 You can override this setting via writecombine=on/off boot parameter.
493 config ARCH_STRICT_ALIGN
494 bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT
497 Not all LoongArch cores support h/w unaligned access, we can use
498 -mstrict-align build parameter to prevent unaligned accesses.
500 CPUs with h/w unaligned access support:
501 Loongson-2K2000/2K3000/3A5000/3C5000/3D5000.
503 CPUs without h/w unaligned access support:
504 Loongson-2K500/2K1000.
506 This option is enabled by default to make the kernel be able to run
507 on all LoongArch systems. But you can disable it manually if you want
508 to run kernel only on systems with h/w unaligned access support in
509 order to optimise for performance.
516 bool "Support for the Loongson SIMD Extension"
517 depends on AS_HAS_LSX_EXTENSION
519 Loongson SIMD Extension (LSX) introduces 128 bit wide vector registers
520 and a set of SIMD instructions to operate on them. When this option
521 is enabled the kernel will support allocating & switching LSX
522 vector register contexts. If you know that your kernel will only be
523 running on CPUs which do not support LSX or that your userland will
524 not be making use of it then you may wish to say N here to reduce
525 the size & complexity of your kernel.
530 bool "Support for the Loongson Advanced SIMD Extension"
531 depends on CPU_HAS_LSX
532 depends on AS_HAS_LASX_EXTENSION
534 Loongson Advanced SIMD Extension (LASX) introduces 256 bit wide vector
535 registers and a set of SIMD instructions to operate on them. When this
536 option is enabled the kernel will support allocating & switching LASX
537 vector register contexts. If you know that your kernel will only be
538 running on CPUs which do not support LASX or that your userland will
539 not be making use of it then you may wish to say N here to reduce
540 the size & complexity of your kernel.
545 bool "Support for the Loongson Binary Translation Extension"
546 depends on AS_HAS_LBT_EXTENSION
548 Loongson Binary Translation (LBT) introduces 4 scratch registers (SCR0
549 to SCR3), x86/ARM eflags (eflags) and x87 fpu stack pointer (ftop).
550 Enabling this option allows the kernel to allocate and switch registers
553 If you want to use this feature, such as the Loongson Architecture
554 Translator (LAT), say Y.
556 config CPU_HAS_PREFETCH
561 bool "Kexec system call"
564 kexec is a system call that implements the ability to shutdown your
565 current kernel, and to start another kernel. It is like a reboot
566 but it is independent of the system firmware. And like a reboot
567 you can start any kernel with it, not just Linux.
569 The name comes from the similarity to the exec system call.
572 bool "Build kdump crash kernel"
575 Generate crash dump after being started by kexec. This should
576 be normally only set in special crash dump kernels which are
577 loaded in the main kernel with kexec-tools into a specially
578 reserved region and then later executed after a crash by
581 For more details see Documentation/admin-guide/kdump/kdump.rst
584 bool "Relocatable kernel"
586 This builds the kernel as a Position Independent Executable (PIE),
587 which retains all relocation metadata required, so as to relocate
588 the kernel binary at runtime to a different virtual address from
591 config RANDOMIZE_BASE
592 bool "Randomize the address of the kernel (KASLR)"
593 depends on RELOCATABLE
595 Randomizes the physical and virtual address at which the
596 kernel image is loaded, as a security feature that
597 deters exploit attempts relying on knowledge of the location
600 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET.
604 config RANDOMIZE_BASE_MAX_OFFSET
605 hex "Maximum KASLR offset" if EXPERT
606 depends on RANDOMIZE_BASE
610 When KASLR is active, this provides the maximum offset that will
611 be applied to the kernel image. It should be set according to the
612 amount of physical RAM available in the target system.
614 This is limited by the size of the lower address memory, 256MB.
617 bool "Enable seccomp to safely compute untrusted bytecode"
621 This kernel feature is useful for number crunching applications
622 that may need to compute untrusted bytecode during their
623 execution. By using pipes or other transports made available to
624 the process as file descriptors supporting the read/write
625 syscalls, it's possible to isolate those applications in
626 their own address space using seccomp. Once seccomp is
627 enabled via /proc/<pid>/seccomp, it cannot be disabled
628 and the task is only allowed to execute a few safe syscalls
629 defined by each seccomp mode.
631 If unsure, say Y. Only embedded should say N here.
635 config ARCH_SELECT_MEMORY_MODEL
638 config ARCH_FLATMEM_ENABLE
642 config ARCH_SPARSEMEM_ENABLE
644 select SPARSEMEM_VMEMMAP_ENABLE
646 Say Y to support efficient handling of sparse physical memory,
647 for architectures which are either NUMA (Non-Uniform Memory Access)
648 or have huge holes in the physical address space for other reasons.
649 See <file:Documentation/mm/numa.rst> for more.
651 config ARCH_ENABLE_THP_MIGRATION
653 depends on TRANSPARENT_HUGEPAGE
655 config ARCH_MEMORY_PROBE
657 depends on MEMORY_HOTPLUG
663 config ARCH_MMAP_RND_BITS_MIN
666 config ARCH_MMAP_RND_BITS_MAX
669 config ARCH_SUPPORTS_UPROBES
672 menu "Power management options"
674 config ARCH_SUSPEND_POSSIBLE
677 config ARCH_HIBERNATION_POSSIBLE
680 source "kernel/power/Kconfig"
681 source "drivers/acpi/Kconfig"