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
133 select HAVE_MOD_ARCH_SPECIFIC
136 select HAVE_PERF_EVENTS
137 select HAVE_PERF_REGS
138 select HAVE_PERF_USER_STACK_DUMP
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 config AS_HAS_LVZ_EXTENSION
268 def_bool $(as-instr,hvcl 0)
270 menu "Kernel type and options"
272 source "kernel/Kconfig.hz"
275 prompt "Page Table Layout"
276 default 16KB_2LEVEL if 32BIT
277 default 16KB_3LEVEL if 64BIT
279 Allows choosing the page table layout, which is a combination
280 of page size and page table levels. The size of virtual memory
281 address space are determined by the page table layout.
284 bool "4KB with 3 levels"
286 select PGTABLE_3LEVEL
288 This option selects 4KB page size with 3 level page tables, which
289 support a maximum of 39 bits of application virtual memory.
292 bool "4KB with 4 levels"
294 select PGTABLE_4LEVEL
296 This option selects 4KB page size with 4 level page tables, which
297 support a maximum of 48 bits of application virtual memory.
300 bool "16KB with 2 levels"
301 select PAGE_SIZE_16KB
302 select PGTABLE_2LEVEL
304 This option selects 16KB page size with 2 level page tables, which
305 support a maximum of 36 bits of application virtual memory.
308 bool "16KB with 3 levels"
309 select PAGE_SIZE_16KB
310 select PGTABLE_3LEVEL
312 This option selects 16KB page size with 3 level page tables, which
313 support a maximum of 47 bits of application virtual memory.
316 bool "64KB with 2 levels"
317 select PAGE_SIZE_64KB
318 select PGTABLE_2LEVEL
320 This option selects 64KB page size with 2 level page tables, which
321 support a maximum of 42 bits of application virtual memory.
324 bool "64KB with 3 levels"
325 select PAGE_SIZE_64KB
326 select PGTABLE_3LEVEL
328 This option selects 64KB page size with 3 level page tables, which
329 support a maximum of 55 bits of application virtual memory.
334 string "Built-in kernel command line"
336 For most platforms, the arguments for the kernel's command line
337 are provided at run-time, during boot. However, there are cases
338 where either no arguments are being provided or the provided
339 arguments are insufficient or even invalid.
341 When that occurs, it is possible to define a built-in command
342 line here and choose how the kernel should use it later on.
345 prompt "Kernel command line type"
346 default CMDLINE_BOOTLOADER
348 Choose how the kernel will handle the provided built-in command
351 config CMDLINE_BOOTLOADER
352 bool "Use bootloader kernel arguments if available"
354 Prefer the command-line passed by the boot loader if available.
355 Use the built-in command line as fallback in case we get nothing
356 during boot. This is the default behaviour.
358 config CMDLINE_EXTEND
359 bool "Use built-in to extend bootloader kernel arguments"
361 The command-line arguments provided during boot will be
362 appended to the built-in command line. This is useful in
363 cases where the provided arguments are insufficient and
364 you don't want to or cannot modify them.
367 bool "Always use the built-in kernel command string"
369 Always use the built-in command line, even if we get one during
370 boot. This is useful in case you need to override the provided
371 command line on systems where you don't have or want control
377 bool "Enable DMI scanning"
378 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
381 This enables SMBIOS/DMI feature for systems, and scanning of
382 DMI to identify machine quirks.
385 bool "EFI runtime service support"
387 select EFI_RUNTIME_WRAPPERS
389 This enables the kernel to use EFI runtime services that are
390 available (such as the EFI variable services).
393 bool "EFI boot stub support"
396 select EFI_GENERIC_STUB
398 This kernel feature allows the kernel to be loaded directly by
399 EFI firmware without the use of a bootloader.
402 bool "SMT scheduler support"
405 Improves scheduler's performance when there are multiple
406 threads in one physical core.
409 bool "Multi-Processing support"
411 This enables support for systems with more than one CPU. If you have
412 a system with only one CPU, say N. If you have a system with more
415 If you say N here, the kernel will run on uni- and multiprocessor
416 machines, but will use only one CPU of a multiprocessor machine. If
417 you say Y here, the kernel will run on many, but not all,
418 uniprocessor machines. On a uniprocessor machine, the kernel
419 will run faster if you say N here.
421 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>.
423 If you don't know what to do here, say N.
426 bool "Support for hot-pluggable CPUs"
428 select GENERIC_IRQ_MIGRATION
430 Say Y here to allow turning CPUs off and on. CPUs can be
431 controlled through /sys/devices/system/cpu.
432 (Note: power management support will enable this option
433 automatically on SMP systems. )
434 Say N if you want to disable CPU hotplug.
437 int "Maximum number of CPUs (2-256)"
442 This allows you to specify the maximum number of CPUs which this
448 select ACPI_NUMA if ACPI
450 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access)
451 support. This option improves performance on systems with more
452 than one NUMA node; on single node systems it is generally better
453 to leave it disabled.
460 config ARCH_FORCE_MAX_ORDER
461 int "Maximum zone order"
462 default "13" if PAGE_SIZE_64KB
463 default "11" if PAGE_SIZE_16KB
466 The kernel memory allocator divides physically contiguous memory
467 blocks into "zones", where each zone is a power of two number of
468 pages. This option selects the largest power of two that the kernel
469 keeps in the memory allocator. If you need to allocate very large
470 blocks of physically contiguous memory, then you may need to
473 The page size is not necessarily 4KB. Keep this in mind
474 when choosing a value for this option.
477 bool "Enable LoongArch DMW-based ioremap()"
479 We use generic TLB-based ioremap() by default since it has page
480 protection support. However, you can enable LoongArch DMW-based
481 ioremap() for better performance.
483 config ARCH_WRITECOMBINE
484 bool "Enable WriteCombine (WUC) for ioremap()"
486 LoongArch maintains cache coherency in hardware, but when paired
487 with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which
488 is similar to WriteCombine) is out of the scope of cache coherency
489 machanism for PCIe devices (this is a PCIe protocol violation, which
490 may be fixed in newer chipsets).
492 This means WUC can only used for write-only memory regions now, so
493 this option is disabled by default, making WUC silently fallback to
494 SUC for ioremap(). You can enable this option if the kernel is ensured
495 to run on hardware without this bug.
497 You can override this setting via writecombine=on/off boot parameter.
499 config ARCH_STRICT_ALIGN
500 bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT
503 Not all LoongArch cores support h/w unaligned access, we can use
504 -mstrict-align build parameter to prevent unaligned accesses.
506 CPUs with h/w unaligned access support:
507 Loongson-2K2000/2K3000/3A5000/3C5000/3D5000.
509 CPUs without h/w unaligned access support:
510 Loongson-2K500/2K1000.
512 This option is enabled by default to make the kernel be able to run
513 on all LoongArch systems. But you can disable it manually if you want
514 to run kernel only on systems with h/w unaligned access support in
515 order to optimise for performance.
522 bool "Support for the Loongson SIMD Extension"
523 depends on AS_HAS_LSX_EXTENSION
525 Loongson SIMD Extension (LSX) introduces 128 bit wide vector registers
526 and a set of SIMD instructions to operate on them. When this option
527 is enabled the kernel will support allocating & switching LSX
528 vector register contexts. If you know that your kernel will only be
529 running on CPUs which do not support LSX or that your userland will
530 not be making use of it then you may wish to say N here to reduce
531 the size & complexity of your kernel.
536 bool "Support for the Loongson Advanced SIMD Extension"
537 depends on CPU_HAS_LSX
538 depends on AS_HAS_LASX_EXTENSION
540 Loongson Advanced SIMD Extension (LASX) introduces 256 bit wide vector
541 registers and a set of SIMD instructions to operate on them. When this
542 option is enabled the kernel will support allocating & switching LASX
543 vector register contexts. If you know that your kernel will only be
544 running on CPUs which do not support LASX or that your userland will
545 not be making use of it then you may wish to say N here to reduce
546 the size & complexity of your kernel.
551 bool "Support for the Loongson Binary Translation Extension"
552 depends on AS_HAS_LBT_EXTENSION
554 Loongson Binary Translation (LBT) introduces 4 scratch registers (SCR0
555 to SCR3), x86/ARM eflags (eflags) and x87 fpu stack pointer (ftop).
556 Enabling this option allows the kernel to allocate and switch registers
559 If you want to use this feature, such as the Loongson Architecture
560 Translator (LAT), say Y.
562 config CPU_HAS_PREFETCH
566 config ARCH_SUPPORTS_KEXEC
569 config ARCH_SUPPORTS_CRASH_DUMP
572 config ARCH_SELECTS_CRASH_DUMP
574 depends on CRASH_DUMP
578 bool "Relocatable kernel"
580 This builds the kernel as a Position Independent Executable (PIE),
581 which retains all relocation metadata required, so as to relocate
582 the kernel binary at runtime to a different virtual address from
585 config RANDOMIZE_BASE
586 bool "Randomize the address of the kernel (KASLR)"
587 depends on RELOCATABLE
589 Randomizes the physical and virtual address at which the
590 kernel image is loaded, as a security feature that
591 deters exploit attempts relying on knowledge of the location
594 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET.
598 config RANDOMIZE_BASE_MAX_OFFSET
599 hex "Maximum KASLR offset" if EXPERT
600 depends on RANDOMIZE_BASE
604 When KASLR is active, this provides the maximum offset that will
605 be applied to the kernel image. It should be set according to the
606 amount of physical RAM available in the target system.
608 This is limited by the size of the lower address memory, 256MB.
611 bool "Enable seccomp to safely compute untrusted bytecode"
615 This kernel feature is useful for number crunching applications
616 that may need to compute untrusted bytecode during their
617 execution. By using pipes or other transports made available to
618 the process as file descriptors supporting the read/write
619 syscalls, it's possible to isolate those applications in
620 their own address space using seccomp. Once seccomp is
621 enabled via /proc/<pid>/seccomp, it cannot be disabled
622 and the task is only allowed to execute a few safe syscalls
623 defined by each seccomp mode.
625 If unsure, say Y. Only embedded should say N here.
629 config ARCH_SELECT_MEMORY_MODEL
632 config ARCH_FLATMEM_ENABLE
636 config ARCH_SPARSEMEM_ENABLE
638 select SPARSEMEM_VMEMMAP_ENABLE
640 Say Y to support efficient handling of sparse physical memory,
641 for architectures which are either NUMA (Non-Uniform Memory Access)
642 or have huge holes in the physical address space for other reasons.
643 See <file:Documentation/mm/numa.rst> for more.
645 config ARCH_ENABLE_THP_MIGRATION
647 depends on TRANSPARENT_HUGEPAGE
649 config ARCH_MEMORY_PROBE
651 depends on MEMORY_HOTPLUG
657 config ARCH_MMAP_RND_BITS_MIN
660 config ARCH_MMAP_RND_BITS_MAX
663 config ARCH_SUPPORTS_UPROBES
666 config KASAN_SHADOW_OFFSET
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"
684 source "arch/loongarch/kvm/Kconfig"