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_DISABLE_KASAN_INLINE
12 select ARCH_ENABLE_MEMORY_HOTPLUG
13 select ARCH_ENABLE_MEMORY_HOTREMOVE
14 select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
15 select ARCH_HAS_CPU_FINALIZE_INIT
16 select ARCH_HAS_FORTIFY_SOURCE
18 select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
19 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
20 select ARCH_HAS_PTE_SPECIAL
21 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
22 select ARCH_INLINE_READ_LOCK if !PREEMPTION
23 select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION
24 select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION
25 select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION
26 select ARCH_INLINE_READ_UNLOCK if !PREEMPTION
27 select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION
28 select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION
29 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION
30 select ARCH_INLINE_WRITE_LOCK if !PREEMPTION
31 select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION
32 select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION
33 select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION
34 select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION
35 select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION
36 select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION
37 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION
38 select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION
39 select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION
40 select ARCH_INLINE_SPIN_LOCK if !PREEMPTION
41 select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION
42 select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION
43 select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION
44 select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION
45 select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION
46 select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION
47 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION
48 select ARCH_KEEP_MEMBLOCK
49 select ARCH_MIGHT_HAVE_PC_PARPORT
50 select ARCH_MIGHT_HAVE_PC_SERIO
51 select ARCH_SPARSEMEM_ENABLE
53 select ARCH_SUPPORTS_ACPI
54 select ARCH_SUPPORTS_ATOMIC_RMW
55 select ARCH_SUPPORTS_HUGETLBFS
56 select ARCH_SUPPORTS_LTO_CLANG
57 select ARCH_SUPPORTS_LTO_CLANG_THIN
58 select ARCH_SUPPORTS_NUMA_BALANCING
59 select ARCH_USE_BUILTIN_BSWAP
60 select ARCH_USE_CMPXCHG_LOCKREF
61 select ARCH_USE_QUEUED_RWLOCKS
62 select ARCH_USE_QUEUED_SPINLOCKS
63 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
64 select ARCH_WANT_LD_ORPHAN_WARN
65 select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
66 select ARCH_WANTS_NO_INSTR
67 select BUILDTIME_TABLE_SORT
71 select GENERIC_CLOCKEVENTS
72 select GENERIC_CMOS_UPDATE
73 select GENERIC_CPU_AUTOPROBE
75 select GENERIC_GETTIMEOFDAY
76 select GENERIC_IOREMAP if !ARCH_IOREMAP
77 select GENERIC_IRQ_MULTI_HANDLER
78 select GENERIC_IRQ_PROBE
79 select GENERIC_IRQ_SHOW
80 select GENERIC_LIB_ASHLDI3
81 select GENERIC_LIB_ASHRDI3
82 select GENERIC_LIB_CMPDI2
83 select GENERIC_LIB_LSHRDI3
84 select GENERIC_LIB_UCMPDI2
85 select GENERIC_LIB_DEVMEM_IS_ALLOWED
86 select GENERIC_PCI_IOMAP
87 select GENERIC_SCHED_CLOCK
88 select GENERIC_SMP_IDLE_THREAD
89 select GENERIC_TIME_VSYSCALL
90 select GENERIC_VDSO_TIME_NS
93 select HAVE_ARCH_AUDITSYSCALL
94 select HAVE_ARCH_JUMP_LABEL
95 select HAVE_ARCH_JUMP_LABEL_RELATIVE
96 select HAVE_ARCH_KASAN
97 select HAVE_ARCH_KFENCE
98 select HAVE_ARCH_KGDB if PERF_EVENTS
99 select HAVE_ARCH_MMAP_RND_BITS if MMU
100 select HAVE_ARCH_SECCOMP_FILTER
101 select HAVE_ARCH_TRACEHOOK
102 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
103 select HAVE_ASM_MODVERSIONS
104 select HAVE_CONTEXT_TRACKING_USER
105 select HAVE_C_RECORDMCOUNT
106 select HAVE_DEBUG_KMEMLEAK
107 select HAVE_DEBUG_STACKOVERFLOW
108 select HAVE_DMA_CONTIGUOUS
109 select HAVE_DYNAMIC_FTRACE
110 select HAVE_DYNAMIC_FTRACE_WITH_ARGS
111 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
112 select HAVE_DYNAMIC_FTRACE_WITH_REGS
114 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !ARCH_STRICT_ALIGN
115 select HAVE_EXIT_THREAD
117 select HAVE_FTRACE_MCOUNT_RECORD
118 select HAVE_FUNCTION_ARG_ACCESS_API
119 select HAVE_FUNCTION_ERROR_INJECTION
120 select HAVE_FUNCTION_GRAPH_RETVAL if HAVE_FUNCTION_GRAPH_TRACER
121 select HAVE_FUNCTION_GRAPH_TRACER
122 select HAVE_FUNCTION_TRACER
123 select HAVE_GCC_PLUGINS
124 select HAVE_GENERIC_VDSO
125 select HAVE_HW_BREAKPOINT if PERF_EVENTS
126 select HAVE_IOREMAP_PROT
127 select HAVE_IRQ_EXIT_ON_IRQ_STACK
128 select HAVE_IRQ_TIME_ACCOUNTING
130 select HAVE_KPROBES_ON_FTRACE
131 select HAVE_KRETPROBES
132 select HAVE_MOD_ARCH_SPECIFIC
135 select HAVE_PERF_EVENTS
136 select HAVE_PERF_REGS
137 select HAVE_PERF_USER_STACK_DUMP
138 select HAVE_PREEMPT_DYNAMIC_KEY
139 select HAVE_REGS_AND_STACK_ACCESS_API
142 select HAVE_SAMPLE_FTRACE_DIRECT
143 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
144 select HAVE_SETUP_PER_CPU_AREA if NUMA
145 select HAVE_STACKPROTECTOR
146 select HAVE_SYSCALL_TRACEPOINTS
148 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP
149 select IRQ_FORCED_THREADING
150 select IRQ_LOONGARCH_CPU
151 select LOCK_MM_AND_FIND_VMA
152 select MMU_GATHER_MERGE_VMAS if MMU
153 select MODULES_USE_ELF_RELA if MODULES
154 select NEED_PER_CPU_EMBED_FIRST_CHUNK
155 select NEED_PER_CPU_PAGE_FIRST_CHUNK
157 select OF_EARLY_FLATTREE
159 select PCI_DOMAINS_GENERIC
160 select PCI_ECAM if ACPI
162 select PCI_MSI_ARCH_FALLBACKS
164 select PERF_USE_VMALLOC
168 select SYSCTL_ARCH_UNALIGN_ALLOW
169 select SYSCTL_ARCH_UNALIGN_NO_WARN
170 select SYSCTL_EXCEPTION_TRACE
172 select TRACE_IRQFLAGS_SUPPORT
173 select USE_PERCPU_NUMA_NODE_ID
174 select USER_STACKTRACE_SUPPORT
187 config GENERIC_BUG_RELATIVE_POINTERS
189 depends on GENERIC_BUG
191 config GENERIC_CALIBRATE_DELAY
197 config GENERIC_HWEIGHT
200 config L1_CACHE_SHIFT
204 config LOCKDEP_SUPPORT
208 config STACKTRACE_SUPPORT
212 # MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the
213 # MIPS Loongson code, to preserve Loongson-specific code paths in drivers that
214 # are shared between architectures, and specifically expecting the symbols.
215 config MACH_LOONGSON32
218 config MACH_LOONGSON64
221 config FIX_EARLYCON_MEM
227 config PAGE_SIZE_16KB
230 config PAGE_SIZE_64KB
233 config PGTABLE_2LEVEL
236 config PGTABLE_3LEVEL
239 config PGTABLE_4LEVEL
242 config PGTABLE_LEVELS
244 default 2 if PGTABLE_2LEVEL
245 default 3 if PGTABLE_3LEVEL
246 default 4 if PGTABLE_4LEVEL
248 config SCHED_OMIT_FRAME_POINTER
252 config AS_HAS_EXPLICIT_RELOCS
253 def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x))
255 config AS_HAS_FCSR_CLASS
256 def_bool $(as-instr,movfcsr2gr \$t0$(comma)\$fcsr0)
258 config AS_HAS_LSX_EXTENSION
259 def_bool $(as-instr,vld \$vr0$(comma)\$a0$(comma)0)
261 config AS_HAS_LASX_EXTENSION
262 def_bool $(as-instr,xvld \$xr0$(comma)\$a0$(comma)0)
264 config AS_HAS_LBT_EXTENSION
265 def_bool $(as-instr,movscr2gr \$a0$(comma)\$scr0)
267 menu "Kernel type and options"
269 source "kernel/Kconfig.hz"
272 prompt "Page Table Layout"
273 default 16KB_2LEVEL if 32BIT
274 default 16KB_3LEVEL if 64BIT
276 Allows choosing the page table layout, which is a combination
277 of page size and page table levels. The size of virtual memory
278 address space are determined by the page table layout.
281 bool "4KB with 3 levels"
283 select PGTABLE_3LEVEL
285 This option selects 4KB page size with 3 level page tables, which
286 support a maximum of 39 bits of application virtual memory.
289 bool "4KB with 4 levels"
291 select PGTABLE_4LEVEL
293 This option selects 4KB page size with 4 level page tables, which
294 support a maximum of 48 bits of application virtual memory.
297 bool "16KB with 2 levels"
298 select PAGE_SIZE_16KB
299 select PGTABLE_2LEVEL
301 This option selects 16KB page size with 2 level page tables, which
302 support a maximum of 36 bits of application virtual memory.
305 bool "16KB with 3 levels"
306 select PAGE_SIZE_16KB
307 select PGTABLE_3LEVEL
309 This option selects 16KB page size with 3 level page tables, which
310 support a maximum of 47 bits of application virtual memory.
313 bool "64KB with 2 levels"
314 select PAGE_SIZE_64KB
315 select PGTABLE_2LEVEL
317 This option selects 64KB page size with 2 level page tables, which
318 support a maximum of 42 bits of application virtual memory.
321 bool "64KB with 3 levels"
322 select PAGE_SIZE_64KB
323 select PGTABLE_3LEVEL
325 This option selects 64KB page size with 3 level page tables, which
326 support a maximum of 55 bits of application virtual memory.
331 string "Built-in kernel command line"
333 For most platforms, the arguments for the kernel's command line
334 are provided at run-time, during boot. However, there are cases
335 where either no arguments are being provided or the provided
336 arguments are insufficient or even invalid.
338 When that occurs, it is possible to define a built-in command
339 line here and choose how the kernel should use it later on.
342 prompt "Kernel command line type"
343 default CMDLINE_BOOTLOADER
345 Choose how the kernel will handle the provided built-in command
348 config CMDLINE_BOOTLOADER
349 bool "Use bootloader kernel arguments if available"
351 Prefer the command-line passed by the boot loader if available.
352 Use the built-in command line as fallback in case we get nothing
353 during boot. This is the default behaviour.
355 config CMDLINE_EXTEND
356 bool "Use built-in to extend bootloader kernel arguments"
358 The command-line arguments provided during boot will be
359 appended to the built-in command line. This is useful in
360 cases where the provided arguments are insufficient and
361 you don't want to or cannot modify them.
364 bool "Always use the built-in kernel command string"
366 Always use the built-in command line, even if we get one during
367 boot. This is useful in case you need to override the provided
368 command line on systems where you don't have or want control
374 bool "Enable DMI scanning"
375 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
378 This enables SMBIOS/DMI feature for systems, and scanning of
379 DMI to identify machine quirks.
382 bool "EFI runtime service support"
384 select EFI_RUNTIME_WRAPPERS
386 This enables the kernel to use EFI runtime services that are
387 available (such as the EFI variable services).
390 bool "EFI boot stub support"
393 select EFI_GENERIC_STUB
395 This kernel feature allows the kernel to be loaded directly by
396 EFI firmware without the use of a bootloader.
399 bool "SMT scheduler support"
402 Improves scheduler's performance when there are multiple
403 threads in one physical core.
406 bool "Multi-Processing support"
408 This enables support for systems with more than one CPU. If you have
409 a system with only one CPU, say N. If you have a system with more
412 If you say N here, the kernel will run on uni- and multiprocessor
413 machines, but will use only one CPU of a multiprocessor machine. If
414 you say Y here, the kernel will run on many, but not all,
415 uniprocessor machines. On a uniprocessor machine, the kernel
416 will run faster if you say N here.
418 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>.
420 If you don't know what to do here, say N.
423 bool "Support for hot-pluggable CPUs"
425 select GENERIC_IRQ_MIGRATION
427 Say Y here to allow turning CPUs off and on. CPUs can be
428 controlled through /sys/devices/system/cpu.
429 (Note: power management support will enable this option
430 automatically on SMP systems. )
431 Say N if you want to disable CPU hotplug.
434 int "Maximum number of CPUs (2-256)"
439 This allows you to specify the maximum number of CPUs which this
445 select ACPI_NUMA if ACPI
447 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access)
448 support. This option improves performance on systems with more
449 than one NUMA node; on single node systems it is generally better
450 to leave it disabled.
457 config ARCH_FORCE_MAX_ORDER
458 int "Maximum zone order"
459 default "13" if PAGE_SIZE_64KB
460 default "11" if PAGE_SIZE_16KB
463 The kernel memory allocator divides physically contiguous memory
464 blocks into "zones", where each zone is a power of two number of
465 pages. This option selects the largest power of two that the kernel
466 keeps in the memory allocator. If you need to allocate very large
467 blocks of physically contiguous memory, then you may need to
470 The page size is not necessarily 4KB. Keep this in mind
471 when choosing a value for this option.
474 bool "Enable LoongArch DMW-based ioremap()"
476 We use generic TLB-based ioremap() by default since it has page
477 protection support. However, you can enable LoongArch DMW-based
478 ioremap() for better performance.
480 config ARCH_WRITECOMBINE
481 bool "Enable WriteCombine (WUC) for ioremap()"
483 LoongArch maintains cache coherency in hardware, but when paired
484 with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which
485 is similar to WriteCombine) is out of the scope of cache coherency
486 machanism for PCIe devices (this is a PCIe protocol violation, which
487 may be fixed in newer chipsets).
489 This means WUC can only used for write-only memory regions now, so
490 this option is disabled by default, making WUC silently fallback to
491 SUC for ioremap(). You can enable this option if the kernel is ensured
492 to run on hardware without this bug.
494 You can override this setting via writecombine=on/off boot parameter.
496 config ARCH_STRICT_ALIGN
497 bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT
500 Not all LoongArch cores support h/w unaligned access, we can use
501 -mstrict-align build parameter to prevent unaligned accesses.
503 CPUs with h/w unaligned access support:
504 Loongson-2K2000/2K3000/3A5000/3C5000/3D5000.
506 CPUs without h/w unaligned access support:
507 Loongson-2K500/2K1000.
509 This option is enabled by default to make the kernel be able to run
510 on all LoongArch systems. But you can disable it manually if you want
511 to run kernel only on systems with h/w unaligned access support in
512 order to optimise for performance.
519 bool "Support for the Loongson SIMD Extension"
520 depends on AS_HAS_LSX_EXTENSION
522 Loongson SIMD Extension (LSX) introduces 128 bit wide vector registers
523 and a set of SIMD instructions to operate on them. When this option
524 is enabled the kernel will support allocating & switching LSX
525 vector register contexts. If you know that your kernel will only be
526 running on CPUs which do not support LSX or that your userland will
527 not be making use of it then you may wish to say N here to reduce
528 the size & complexity of your kernel.
533 bool "Support for the Loongson Advanced SIMD Extension"
534 depends on CPU_HAS_LSX
535 depends on AS_HAS_LASX_EXTENSION
537 Loongson Advanced SIMD Extension (LASX) introduces 256 bit wide vector
538 registers and a set of SIMD instructions to operate on them. When this
539 option is enabled the kernel will support allocating & switching LASX
540 vector register contexts. If you know that your kernel will only be
541 running on CPUs which do not support LASX or that your userland will
542 not be making use of it then you may wish to say N here to reduce
543 the size & complexity of your kernel.
548 bool "Support for the Loongson Binary Translation Extension"
549 depends on AS_HAS_LBT_EXTENSION
551 Loongson Binary Translation (LBT) introduces 4 scratch registers (SCR0
552 to SCR3), x86/ARM eflags (eflags) and x87 fpu stack pointer (ftop).
553 Enabling this option allows the kernel to allocate and switch registers
556 If you want to use this feature, such as the Loongson Architecture
557 Translator (LAT), say Y.
559 config CPU_HAS_PREFETCH
563 config ARCH_SUPPORTS_KEXEC
566 config ARCH_SUPPORTS_CRASH_DUMP
569 config ARCH_SELECTS_CRASH_DUMP
571 depends on CRASH_DUMP
575 bool "Relocatable kernel"
577 This builds the kernel as a Position Independent Executable (PIE),
578 which retains all relocation metadata required, so as to relocate
579 the kernel binary at runtime to a different virtual address from
582 config RANDOMIZE_BASE
583 bool "Randomize the address of the kernel (KASLR)"
584 depends on RELOCATABLE
586 Randomizes the physical and virtual address at which the
587 kernel image is loaded, as a security feature that
588 deters exploit attempts relying on knowledge of the location
591 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET.
595 config RANDOMIZE_BASE_MAX_OFFSET
596 hex "Maximum KASLR offset" if EXPERT
597 depends on RANDOMIZE_BASE
601 When KASLR is active, this provides the maximum offset that will
602 be applied to the kernel image. It should be set according to the
603 amount of physical RAM available in the target system.
605 This is limited by the size of the lower address memory, 256MB.
608 bool "Enable seccomp to safely compute untrusted bytecode"
612 This kernel feature is useful for number crunching applications
613 that may need to compute untrusted bytecode during their
614 execution. By using pipes or other transports made available to
615 the process as file descriptors supporting the read/write
616 syscalls, it's possible to isolate those applications in
617 their own address space using seccomp. Once seccomp is
618 enabled via /proc/<pid>/seccomp, it cannot be disabled
619 and the task is only allowed to execute a few safe syscalls
620 defined by each seccomp mode.
622 If unsure, say Y. Only embedded should say N here.
626 config ARCH_SELECT_MEMORY_MODEL
629 config ARCH_FLATMEM_ENABLE
633 config ARCH_SPARSEMEM_ENABLE
635 select SPARSEMEM_VMEMMAP_ENABLE
637 Say Y to support efficient handling of sparse physical memory,
638 for architectures which are either NUMA (Non-Uniform Memory Access)
639 or have huge holes in the physical address space for other reasons.
640 See <file:Documentation/mm/numa.rst> for more.
642 config ARCH_ENABLE_THP_MIGRATION
644 depends on TRANSPARENT_HUGEPAGE
646 config ARCH_MEMORY_PROBE
648 depends on MEMORY_HOTPLUG
654 config ARCH_MMAP_RND_BITS_MIN
657 config ARCH_MMAP_RND_BITS_MAX
660 config ARCH_SUPPORTS_UPROBES
663 config KASAN_SHADOW_OFFSET
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"