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_KGDB if PERF_EVENTS
96 select HAVE_ARCH_MMAP_RND_BITS if MMU
97 select HAVE_ARCH_SECCOMP_FILTER
98 select HAVE_ARCH_TRACEHOOK
99 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
100 select HAVE_ASM_MODVERSIONS
101 select HAVE_CONTEXT_TRACKING_USER
102 select HAVE_C_RECORDMCOUNT
103 select HAVE_DEBUG_KMEMLEAK
104 select HAVE_DEBUG_STACKOVERFLOW
105 select HAVE_DMA_CONTIGUOUS
106 select HAVE_DYNAMIC_FTRACE
107 select HAVE_DYNAMIC_FTRACE_WITH_ARGS
108 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
109 select HAVE_DYNAMIC_FTRACE_WITH_REGS
111 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !ARCH_STRICT_ALIGN
112 select HAVE_EXIT_THREAD
114 select HAVE_FTRACE_MCOUNT_RECORD
115 select HAVE_FUNCTION_ARG_ACCESS_API
116 select HAVE_FUNCTION_ERROR_INJECTION
117 select HAVE_FUNCTION_GRAPH_RETVAL if HAVE_FUNCTION_GRAPH_TRACER
118 select HAVE_FUNCTION_GRAPH_TRACER
119 select HAVE_FUNCTION_TRACER
120 select HAVE_GCC_PLUGINS
121 select HAVE_GENERIC_VDSO
122 select HAVE_HW_BREAKPOINT if PERF_EVENTS
123 select HAVE_IOREMAP_PROT
124 select HAVE_IRQ_EXIT_ON_IRQ_STACK
125 select HAVE_IRQ_TIME_ACCOUNTING
127 select HAVE_KPROBES_ON_FTRACE
128 select HAVE_KRETPROBES
129 select HAVE_MOD_ARCH_SPECIFIC
132 select HAVE_PERF_EVENTS
133 select HAVE_PERF_REGS
134 select HAVE_PERF_USER_STACK_DUMP
135 select HAVE_REGS_AND_STACK_ACCESS_API
138 select HAVE_SAMPLE_FTRACE_DIRECT
139 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
140 select HAVE_SETUP_PER_CPU_AREA if NUMA
141 select HAVE_STACKPROTECTOR
142 select HAVE_SYSCALL_TRACEPOINTS
144 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP
145 select IRQ_FORCED_THREADING
146 select IRQ_LOONGARCH_CPU
147 select LOCK_MM_AND_FIND_VMA
148 select MMU_GATHER_MERGE_VMAS if MMU
149 select MODULES_USE_ELF_RELA if MODULES
150 select NEED_PER_CPU_EMBED_FIRST_CHUNK
151 select NEED_PER_CPU_PAGE_FIRST_CHUNK
153 select OF_EARLY_FLATTREE
155 select PCI_DOMAINS_GENERIC
156 select PCI_ECAM if ACPI
158 select PCI_MSI_ARCH_FALLBACKS
160 select PERF_USE_VMALLOC
164 select SYSCTL_ARCH_UNALIGN_ALLOW
165 select SYSCTL_ARCH_UNALIGN_NO_WARN
166 select SYSCTL_EXCEPTION_TRACE
168 select TRACE_IRQFLAGS_SUPPORT
169 select USE_PERCPU_NUMA_NODE_ID
170 select USER_STACKTRACE_SUPPORT
183 config GENERIC_BUG_RELATIVE_POINTERS
185 depends on GENERIC_BUG
187 config GENERIC_CALIBRATE_DELAY
193 config GENERIC_HWEIGHT
196 config L1_CACHE_SHIFT
200 config LOCKDEP_SUPPORT
204 config STACKTRACE_SUPPORT
208 # MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the
209 # MIPS Loongson code, to preserve Loongson-specific code paths in drivers that
210 # are shared between architectures, and specifically expecting the symbols.
211 config MACH_LOONGSON32
214 config MACH_LOONGSON64
217 config FIX_EARLYCON_MEM
223 config PAGE_SIZE_16KB
226 config PAGE_SIZE_64KB
229 config PGTABLE_2LEVEL
232 config PGTABLE_3LEVEL
235 config PGTABLE_4LEVEL
238 config PGTABLE_LEVELS
240 default 2 if PGTABLE_2LEVEL
241 default 3 if PGTABLE_3LEVEL
242 default 4 if PGTABLE_4LEVEL
244 config SCHED_OMIT_FRAME_POINTER
248 config AS_HAS_EXPLICIT_RELOCS
249 def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x))
251 config AS_HAS_FCSR_CLASS
252 def_bool $(as-instr,movfcsr2gr \$t0$(comma)\$fcsr0)
254 config AS_HAS_LSX_EXTENSION
255 def_bool $(as-instr,vld \$vr0$(comma)\$a0$(comma)0)
257 config AS_HAS_LASX_EXTENSION
258 def_bool $(as-instr,xvld \$xr0$(comma)\$a0$(comma)0)
260 config AS_HAS_LBT_EXTENSION
261 def_bool $(as-instr,movscr2gr \$a0$(comma)\$scr0)
263 menu "Kernel type and options"
265 source "kernel/Kconfig.hz"
268 prompt "Page Table Layout"
269 default 16KB_2LEVEL if 32BIT
270 default 16KB_3LEVEL if 64BIT
272 Allows choosing the page table layout, which is a combination
273 of page size and page table levels. The size of virtual memory
274 address space are determined by the page table layout.
277 bool "4KB with 3 levels"
279 select PGTABLE_3LEVEL
281 This option selects 4KB page size with 3 level page tables, which
282 support a maximum of 39 bits of application virtual memory.
285 bool "4KB with 4 levels"
287 select PGTABLE_4LEVEL
289 This option selects 4KB page size with 4 level page tables, which
290 support a maximum of 48 bits of application virtual memory.
293 bool "16KB with 2 levels"
294 select PAGE_SIZE_16KB
295 select PGTABLE_2LEVEL
297 This option selects 16KB page size with 2 level page tables, which
298 support a maximum of 36 bits of application virtual memory.
301 bool "16KB with 3 levels"
302 select PAGE_SIZE_16KB
303 select PGTABLE_3LEVEL
305 This option selects 16KB page size with 3 level page tables, which
306 support a maximum of 47 bits of application virtual memory.
309 bool "64KB with 2 levels"
310 select PAGE_SIZE_64KB
311 select PGTABLE_2LEVEL
313 This option selects 64KB page size with 2 level page tables, which
314 support a maximum of 42 bits of application virtual memory.
317 bool "64KB with 3 levels"
318 select PAGE_SIZE_64KB
319 select PGTABLE_3LEVEL
321 This option selects 64KB page size with 3 level page tables, which
322 support a maximum of 55 bits of application virtual memory.
327 string "Built-in kernel command line"
329 For most platforms, the arguments for the kernel's command line
330 are provided at run-time, during boot. However, there are cases
331 where either no arguments are being provided or the provided
332 arguments are insufficient or even invalid.
334 When that occurs, it is possible to define a built-in command
335 line here and choose how the kernel should use it later on.
338 prompt "Kernel command line type"
339 default CMDLINE_BOOTLOADER
341 Choose how the kernel will handle the provided built-in command
344 config CMDLINE_BOOTLOADER
345 bool "Use bootloader kernel arguments if available"
347 Prefer the command-line passed by the boot loader if available.
348 Use the built-in command line as fallback in case we get nothing
349 during boot. This is the default behaviour.
351 config CMDLINE_EXTEND
352 bool "Use built-in to extend bootloader kernel arguments"
354 The command-line arguments provided during boot will be
355 appended to the built-in command line. This is useful in
356 cases where the provided arguments are insufficient and
357 you don't want to or cannot modify them.
360 bool "Always use the built-in kernel command string"
362 Always use the built-in command line, even if we get one during
363 boot. This is useful in case you need to override the provided
364 command line on systems where you don't have or want control
370 bool "Enable DMI scanning"
371 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
374 This enables SMBIOS/DMI feature for systems, and scanning of
375 DMI to identify machine quirks.
378 bool "EFI runtime service support"
380 select EFI_RUNTIME_WRAPPERS
382 This enables the kernel to use EFI runtime services that are
383 available (such as the EFI variable services).
386 bool "EFI boot stub support"
389 select EFI_GENERIC_STUB
391 This kernel feature allows the kernel to be loaded directly by
392 EFI firmware without the use of a bootloader.
395 bool "SMT scheduler support"
398 Improves scheduler's performance when there are multiple
399 threads in one physical core.
402 bool "Multi-Processing support"
404 This enables support for systems with more than one CPU. If you have
405 a system with only one CPU, say N. If you have a system with more
408 If you say N here, the kernel will run on uni- and multiprocessor
409 machines, but will use only one CPU of a multiprocessor machine. If
410 you say Y here, the kernel will run on many, but not all,
411 uniprocessor machines. On a uniprocessor machine, the kernel
412 will run faster if you say N here.
414 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>.
416 If you don't know what to do here, say N.
419 bool "Support for hot-pluggable CPUs"
421 select GENERIC_IRQ_MIGRATION
423 Say Y here to allow turning CPUs off and on. CPUs can be
424 controlled through /sys/devices/system/cpu.
425 (Note: power management support will enable this option
426 automatically on SMP systems. )
427 Say N if you want to disable CPU hotplug.
430 int "Maximum number of CPUs (2-256)"
435 This allows you to specify the maximum number of CPUs which this
441 select ACPI_NUMA if ACPI
443 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access)
444 support. This option improves performance on systems with more
445 than one NUMA node; on single node systems it is generally better
446 to leave it disabled.
453 config ARCH_FORCE_MAX_ORDER
454 int "Maximum zone order"
455 default "13" if PAGE_SIZE_64KB
456 default "11" if PAGE_SIZE_16KB
459 The kernel memory allocator divides physically contiguous memory
460 blocks into "zones", where each zone is a power of two number of
461 pages. This option selects the largest power of two that the kernel
462 keeps in the memory allocator. If you need to allocate very large
463 blocks of physically contiguous memory, then you may need to
466 The page size is not necessarily 4KB. Keep this in mind
467 when choosing a value for this option.
470 bool "Enable LoongArch DMW-based ioremap()"
472 We use generic TLB-based ioremap() by default since it has page
473 protection support. However, you can enable LoongArch DMW-based
474 ioremap() for better performance.
476 config ARCH_WRITECOMBINE
477 bool "Enable WriteCombine (WUC) for ioremap()"
479 LoongArch maintains cache coherency in hardware, but when paired
480 with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which
481 is similar to WriteCombine) is out of the scope of cache coherency
482 machanism for PCIe devices (this is a PCIe protocol violation, which
483 may be fixed in newer chipsets).
485 This means WUC can only used for write-only memory regions now, so
486 this option is disabled by default, making WUC silently fallback to
487 SUC for ioremap(). You can enable this option if the kernel is ensured
488 to run on hardware without this bug.
490 You can override this setting via writecombine=on/off boot parameter.
492 config ARCH_STRICT_ALIGN
493 bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT
496 Not all LoongArch cores support h/w unaligned access, we can use
497 -mstrict-align build parameter to prevent unaligned accesses.
499 CPUs with h/w unaligned access support:
500 Loongson-2K2000/2K3000/3A5000/3C5000/3D5000.
502 CPUs without h/w unaligned access support:
503 Loongson-2K500/2K1000.
505 This option is enabled by default to make the kernel be able to run
506 on all LoongArch systems. But you can disable it manually if you want
507 to run kernel only on systems with h/w unaligned access support in
508 order to optimise for performance.
515 bool "Support for the Loongson SIMD Extension"
516 depends on AS_HAS_LSX_EXTENSION
518 Loongson SIMD Extension (LSX) introduces 128 bit wide vector registers
519 and a set of SIMD instructions to operate on them. When this option
520 is enabled the kernel will support allocating & switching LSX
521 vector register contexts. If you know that your kernel will only be
522 running on CPUs which do not support LSX or that your userland will
523 not be making use of it then you may wish to say N here to reduce
524 the size & complexity of your kernel.
529 bool "Support for the Loongson Advanced SIMD Extension"
530 depends on CPU_HAS_LSX
531 depends on AS_HAS_LASX_EXTENSION
533 Loongson Advanced SIMD Extension (LASX) introduces 256 bit wide vector
534 registers and a set of SIMD instructions to operate on them. When this
535 option is enabled the kernel will support allocating & switching LASX
536 vector register contexts. If you know that your kernel will only be
537 running on CPUs which do not support LASX or that your userland will
538 not be making use of it then you may wish to say N here to reduce
539 the size & complexity of your kernel.
544 bool "Support for the Loongson Binary Translation Extension"
545 depends on AS_HAS_LBT_EXTENSION
547 Loongson Binary Translation (LBT) introduces 4 scratch registers (SCR0
548 to SCR3), x86/ARM eflags (eflags) and x87 fpu stack pointer (ftop).
549 Enabling this option allows the kernel to allocate and switch registers
552 If you want to use this feature, such as the Loongson Architecture
553 Translator (LAT), say Y.
555 config CPU_HAS_PREFETCH
560 bool "Kexec system call"
563 kexec is a system call that implements the ability to shutdown your
564 current kernel, and to start another kernel. It is like a reboot
565 but it is independent of the system firmware. And like a reboot
566 you can start any kernel with it, not just Linux.
568 The name comes from the similarity to the exec system call.
571 bool "Build kdump crash kernel"
574 Generate crash dump after being started by kexec. This should
575 be normally only set in special crash dump kernels which are
576 loaded in the main kernel with kexec-tools into a specially
577 reserved region and then later executed after a crash by
580 For more details see Documentation/admin-guide/kdump/kdump.rst
583 bool "Relocatable kernel"
585 This builds the kernel as a Position Independent Executable (PIE),
586 which retains all relocation metadata required, so as to relocate
587 the kernel binary at runtime to a different virtual address from
590 config RANDOMIZE_BASE
591 bool "Randomize the address of the kernel (KASLR)"
592 depends on RELOCATABLE
594 Randomizes the physical and virtual address at which the
595 kernel image is loaded, as a security feature that
596 deters exploit attempts relying on knowledge of the location
599 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET.
603 config RANDOMIZE_BASE_MAX_OFFSET
604 hex "Maximum KASLR offset" if EXPERT
605 depends on RANDOMIZE_BASE
609 When KASLR is active, this provides the maximum offset that will
610 be applied to the kernel image. It should be set according to the
611 amount of physical RAM available in the target system.
613 This is limited by the size of the lower address memory, 256MB.
616 bool "Enable seccomp to safely compute untrusted bytecode"
620 This kernel feature is useful for number crunching applications
621 that may need to compute untrusted bytecode during their
622 execution. By using pipes or other transports made available to
623 the process as file descriptors supporting the read/write
624 syscalls, it's possible to isolate those applications in
625 their own address space using seccomp. Once seccomp is
626 enabled via /proc/<pid>/seccomp, it cannot be disabled
627 and the task is only allowed to execute a few safe syscalls
628 defined by each seccomp mode.
630 If unsure, say Y. Only embedded should say N here.
634 config ARCH_SELECT_MEMORY_MODEL
637 config ARCH_FLATMEM_ENABLE
641 config ARCH_SPARSEMEM_ENABLE
643 select SPARSEMEM_VMEMMAP_ENABLE
645 Say Y to support efficient handling of sparse physical memory,
646 for architectures which are either NUMA (Non-Uniform Memory Access)
647 or have huge holes in the physical address space for other reasons.
648 See <file:Documentation/mm/numa.rst> for more.
650 config ARCH_ENABLE_THP_MIGRATION
652 depends on TRANSPARENT_HUGEPAGE
654 config ARCH_MEMORY_PROBE
656 depends on MEMORY_HOTPLUG
662 config ARCH_MMAP_RND_BITS_MIN
665 config ARCH_MMAP_RND_BITS_MAX
668 config ARCH_SUPPORTS_UPROBES
671 menu "Power management options"
673 config ARCH_SUSPEND_POSSIBLE
676 config ARCH_HIBERNATION_POSSIBLE
679 source "kernel/power/Kconfig"
680 source "drivers/acpi/Kconfig"