1 # SPDX-License-Identifier: GPL-2.0
6 select ACPI_GENERIC_GSI if ACPI
7 select ACPI_MCFG if ACPI
8 select ACPI_HOTPLUG_CPU if ACPI_PROCESSOR && HOTPLUG_CPU
9 select ACPI_PPTT if ACPI
10 select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
11 select ARCH_BINFMT_ELF_STATE
12 select ARCH_DISABLE_KASAN_INLINE
13 select ARCH_ENABLE_MEMORY_HOTPLUG
14 select ARCH_ENABLE_MEMORY_HOTREMOVE
15 select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE
16 select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
17 select ARCH_HAS_CPU_FINALIZE_INIT
18 select ARCH_HAS_CURRENT_STACK_POINTER
19 select ARCH_HAS_FORTIFY_SOURCE
21 select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
22 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
23 select ARCH_HAS_PTE_SPECIAL
24 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
25 select ARCH_INLINE_READ_LOCK if !PREEMPTION
26 select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION
27 select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION
28 select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION
29 select ARCH_INLINE_READ_UNLOCK if !PREEMPTION
30 select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION
31 select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION
32 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION
33 select ARCH_INLINE_WRITE_LOCK if !PREEMPTION
34 select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION
35 select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION
36 select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION
37 select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION
38 select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION
39 select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION
40 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION
41 select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION
42 select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION
43 select ARCH_INLINE_SPIN_LOCK if !PREEMPTION
44 select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION
45 select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION
46 select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION
47 select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION
48 select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION
49 select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION
50 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION
51 select ARCH_KEEP_MEMBLOCK
52 select ARCH_MIGHT_HAVE_PC_PARPORT
53 select ARCH_MIGHT_HAVE_PC_SERIO
54 select ARCH_SPARSEMEM_ENABLE
56 select ARCH_SUPPORTS_ACPI
57 select ARCH_SUPPORTS_ATOMIC_RMW
58 select ARCH_SUPPORTS_HUGETLBFS
59 select ARCH_SUPPORTS_LTO_CLANG
60 select ARCH_SUPPORTS_LTO_CLANG_THIN
61 select ARCH_SUPPORTS_NUMA_BALANCING
62 select ARCH_USE_BUILTIN_BSWAP
63 select ARCH_USE_CMPXCHG_LOCKREF
64 select ARCH_USE_QUEUED_RWLOCKS
65 select ARCH_USE_QUEUED_SPINLOCKS
66 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
67 select ARCH_WANT_LD_ORPHAN_WARN
68 select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
69 select ARCH_WANTS_NO_INSTR
70 select BUILDTIME_TABLE_SORT
74 select GENERIC_CLOCKEVENTS
75 select GENERIC_CMOS_UPDATE
76 select GENERIC_CPU_AUTOPROBE
77 select GENERIC_CPU_DEVICES
79 select GENERIC_GETTIMEOFDAY
80 select GENERIC_IOREMAP if !ARCH_IOREMAP
81 select GENERIC_IRQ_MULTI_HANDLER
82 select GENERIC_IRQ_PROBE
83 select GENERIC_IRQ_SHOW
84 select GENERIC_LIB_ASHLDI3
85 select GENERIC_LIB_ASHRDI3
86 select GENERIC_LIB_CMPDI2
87 select GENERIC_LIB_LSHRDI3
88 select GENERIC_LIB_UCMPDI2
89 select GENERIC_LIB_DEVMEM_IS_ALLOWED
90 select GENERIC_PCI_IOMAP
91 select GENERIC_SCHED_CLOCK
92 select GENERIC_SMP_IDLE_THREAD
93 select GENERIC_TIME_VSYSCALL
94 select GENERIC_VDSO_TIME_NS
97 select HAVE_ARCH_AUDITSYSCALL
98 select HAVE_ARCH_JUMP_LABEL
99 select HAVE_ARCH_JUMP_LABEL_RELATIVE
100 select HAVE_ARCH_KASAN
101 select HAVE_ARCH_KFENCE
102 select HAVE_ARCH_KGDB if PERF_EVENTS
103 select HAVE_ARCH_MMAP_RND_BITS if MMU
104 select HAVE_ARCH_SECCOMP
105 select HAVE_ARCH_SECCOMP_FILTER
106 select HAVE_ARCH_TRACEHOOK
107 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
108 select HAVE_ARCH_USERFAULTFD_MINOR if USERFAULTFD
109 select HAVE_ASM_MODVERSIONS
110 select HAVE_CONTEXT_TRACKING_USER
111 select HAVE_C_RECORDMCOUNT
112 select HAVE_DEBUG_KMEMLEAK
113 select HAVE_DEBUG_STACKOVERFLOW
114 select HAVE_DMA_CONTIGUOUS
115 select HAVE_DYNAMIC_FTRACE
116 select HAVE_DYNAMIC_FTRACE_WITH_ARGS
117 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
118 select HAVE_DYNAMIC_FTRACE_WITH_REGS
120 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !ARCH_STRICT_ALIGN
121 select HAVE_EXIT_THREAD
123 select HAVE_FTRACE_MCOUNT_RECORD
124 select HAVE_FUNCTION_ARG_ACCESS_API
125 select HAVE_FUNCTION_ERROR_INJECTION
126 select HAVE_FUNCTION_GRAPH_RETVAL if HAVE_FUNCTION_GRAPH_TRACER
127 select HAVE_FUNCTION_GRAPH_TRACER
128 select HAVE_FUNCTION_TRACER
129 select HAVE_GCC_PLUGINS
130 select HAVE_GENERIC_VDSO
131 select HAVE_HW_BREAKPOINT if PERF_EVENTS
132 select HAVE_IOREMAP_PROT
133 select HAVE_IRQ_EXIT_ON_IRQ_STACK
134 select HAVE_IRQ_TIME_ACCOUNTING
136 select HAVE_KPROBES_ON_FTRACE
137 select HAVE_KRETPROBES
139 select HAVE_LIVEPATCH
140 select HAVE_MOD_ARCH_SPECIFIC
142 select HAVE_OBJTOOL if AS_HAS_EXPLICIT_RELOCS
144 select HAVE_PERF_EVENTS
145 select HAVE_PERF_REGS
146 select HAVE_PERF_USER_STACK_DUMP
147 select HAVE_PREEMPT_DYNAMIC_KEY
148 select HAVE_REGS_AND_STACK_ACCESS_API
149 select HAVE_RELIABLE_STACKTRACE if UNWINDER_ORC
153 select HAVE_SAMPLE_FTRACE_DIRECT
154 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
155 select HAVE_SETUP_PER_CPU_AREA if NUMA
156 select HAVE_STACK_VALIDATION if HAVE_OBJTOOL
157 select HAVE_STACKPROTECTOR
158 select HAVE_SYSCALL_TRACEPOINTS
160 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP
161 select IRQ_FORCED_THREADING
162 select IRQ_LOONGARCH_CPU
163 select LOCK_MM_AND_FIND_VMA
164 select MMU_GATHER_MERGE_VMAS if MMU
165 select MODULES_USE_ELF_RELA if MODULES
166 select NEED_PER_CPU_EMBED_FIRST_CHUNK
167 select NEED_PER_CPU_PAGE_FIRST_CHUNK
169 select OF_EARLY_FLATTREE
171 select PCI_DOMAINS_GENERIC
172 select PCI_ECAM if ACPI
174 select PCI_MSI_ARCH_FALLBACKS
176 select PERF_USE_VMALLOC
180 select SYSCTL_ARCH_UNALIGN_ALLOW
181 select SYSCTL_ARCH_UNALIGN_NO_WARN
182 select SYSCTL_EXCEPTION_TRACE
184 select TRACE_IRQFLAGS_SUPPORT
185 select USE_PERCPU_NUMA_NODE_ID
186 select USER_STACKTRACE_SUPPORT
199 config GENERIC_BUG_RELATIVE_POINTERS
201 depends on GENERIC_BUG
203 config GENERIC_CALIBRATE_DELAY
209 config GENERIC_HWEIGHT
212 config L1_CACHE_SHIFT
216 config LOCKDEP_SUPPORT
220 config STACKTRACE_SUPPORT
224 # MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the
225 # MIPS Loongson code, to preserve Loongson-specific code paths in drivers that
226 # are shared between architectures, and specifically expecting the symbols.
227 config MACH_LOONGSON32
230 config MACH_LOONGSON64
233 config FIX_EARLYCON_MEM
239 config PAGE_SIZE_16KB
242 config PAGE_SIZE_64KB
245 config PGTABLE_2LEVEL
248 config PGTABLE_3LEVEL
251 config PGTABLE_4LEVEL
254 config PGTABLE_LEVELS
256 default 2 if PGTABLE_2LEVEL
257 default 3 if PGTABLE_3LEVEL
258 default 4 if PGTABLE_4LEVEL
260 config SCHED_OMIT_FRAME_POINTER
264 config AS_HAS_EXPLICIT_RELOCS
265 def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x))
267 config AS_HAS_FCSR_CLASS
268 def_bool $(as-instr,movfcsr2gr \$t0$(comma)\$fcsr0)
270 config AS_HAS_LSX_EXTENSION
271 def_bool $(as-instr,vld \$vr0$(comma)\$a0$(comma)0)
273 config AS_HAS_LASX_EXTENSION
274 def_bool $(as-instr,xvld \$xr0$(comma)\$a0$(comma)0)
276 config AS_HAS_LBT_EXTENSION
277 def_bool $(as-instr,movscr2gr \$a0$(comma)\$scr0)
279 config AS_HAS_LVZ_EXTENSION
280 def_bool $(as-instr,hvcl 0)
282 menu "Kernel type and options"
284 source "kernel/Kconfig.hz"
287 prompt "Page Table Layout"
288 default 16KB_2LEVEL if 32BIT
289 default 16KB_3LEVEL if 64BIT
291 Allows choosing the page table layout, which is a combination
292 of page size and page table levels. The size of virtual memory
293 address space are determined by the page table layout.
296 bool "4KB with 3 levels"
298 select PGTABLE_3LEVEL
300 This option selects 4KB page size with 3 level page tables, which
301 support a maximum of 39 bits of application virtual memory.
304 bool "4KB with 4 levels"
306 select PGTABLE_4LEVEL
308 This option selects 4KB page size with 4 level page tables, which
309 support a maximum of 48 bits of application virtual memory.
312 bool "16KB with 2 levels"
313 select PAGE_SIZE_16KB
314 select PGTABLE_2LEVEL
316 This option selects 16KB page size with 2 level page tables, which
317 support a maximum of 36 bits of application virtual memory.
320 bool "16KB with 3 levels"
321 select PAGE_SIZE_16KB
322 select PGTABLE_3LEVEL
324 This option selects 16KB page size with 3 level page tables, which
325 support a maximum of 47 bits of application virtual memory.
328 bool "64KB with 2 levels"
329 select PAGE_SIZE_64KB
330 select PGTABLE_2LEVEL
332 This option selects 64KB page size with 2 level page tables, which
333 support a maximum of 42 bits of application virtual memory.
336 bool "64KB with 3 levels"
337 select PAGE_SIZE_64KB
338 select PGTABLE_3LEVEL
340 This option selects 64KB page size with 3 level page tables, which
341 support a maximum of 55 bits of application virtual memory.
346 string "Built-in kernel command line"
348 For most platforms, the arguments for the kernel's command line
349 are provided at run-time, during boot. However, there are cases
350 where either no arguments are being provided or the provided
351 arguments are insufficient or even invalid.
353 When that occurs, it is possible to define a built-in command
354 line here and choose how the kernel should use it later on.
357 prompt "Kernel command line type"
358 default CMDLINE_BOOTLOADER
360 Choose how the kernel will handle the provided built-in command
363 config CMDLINE_BOOTLOADER
364 bool "Use bootloader kernel arguments if available"
366 Prefer the command-line passed by the boot loader if available.
367 Use the built-in command line as fallback in case we get nothing
368 during boot. This is the default behaviour.
370 config CMDLINE_EXTEND
371 bool "Use built-in to extend bootloader kernel arguments"
373 The command-line arguments provided during boot will be
374 appended to the built-in command line. This is useful in
375 cases where the provided arguments are insufficient and
376 you don't want to or cannot modify them.
379 bool "Always use the built-in kernel command string"
381 Always use the built-in command line, even if we get one during
382 boot. This is useful in case you need to override the provided
383 command line on systems where you don't have or want control
389 bool "Enable built-in dtb in kernel"
392 Some existing systems do not provide a canonical device tree to
393 the kernel at boot time. Let's provide a device tree table in the
394 kernel, keyed by the dts filename, containing the relevant DTBs.
396 Built-in DTBs are generic enough and can be used as references.
398 config BUILTIN_DTB_NAME
399 string "Source file for built-in dtb"
400 depends on BUILTIN_DTB
402 Base name (without suffix, relative to arch/loongarch/boot/dts/)
403 for the DTS file that will be used to produce the DTB linked into
407 bool "Enable DMI scanning"
408 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
411 This enables SMBIOS/DMI feature for systems, and scanning of
412 DMI to identify machine quirks.
415 bool "EFI runtime service support"
417 select EFI_RUNTIME_WRAPPERS
419 This enables the kernel to use EFI runtime services that are
420 available (such as the EFI variable services).
423 bool "EFI boot stub support"
426 select EFI_GENERIC_STUB
428 This kernel feature allows the kernel to be loaded directly by
429 EFI firmware without the use of a bootloader.
432 bool "SMT scheduler support"
435 Improves scheduler's performance when there are multiple
436 threads in one physical core.
439 bool "Multi-Processing support"
441 This enables support for systems with more than one CPU. If you have
442 a system with only one CPU, say N. If you have a system with more
445 If you say N here, the kernel will run on uni- and multiprocessor
446 machines, but will use only one CPU of a multiprocessor machine. If
447 you say Y here, the kernel will run on many, but not all,
448 uniprocessor machines. On a uniprocessor machine, the kernel
449 will run faster if you say N here.
451 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>.
453 If you don't know what to do here, say N.
456 bool "Support for hot-pluggable CPUs"
458 select GENERIC_IRQ_MIGRATION
460 Say Y here to allow turning CPUs off and on. CPUs can be
461 controlled through /sys/devices/system/cpu.
462 (Note: power management support will enable this option
463 automatically on SMP systems. )
464 Say N if you want to disable CPU hotplug.
467 int "Maximum number of CPUs (2-256)"
472 This allows you to specify the maximum number of CPUs which this
478 select ACPI_NUMA if ACPI
480 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access)
481 support. This option improves performance on systems with more
482 than one NUMA node; on single node systems it is generally better
483 to leave it disabled.
490 config ARCH_FORCE_MAX_ORDER
491 int "Maximum zone order"
492 default "13" if PAGE_SIZE_64KB
493 default "11" if PAGE_SIZE_16KB
496 The kernel memory allocator divides physically contiguous memory
497 blocks into "zones", where each zone is a power of two number of
498 pages. This option selects the largest power of two that the kernel
499 keeps in the memory allocator. If you need to allocate very large
500 blocks of physically contiguous memory, then you may need to
503 The page size is not necessarily 4KB. Keep this in mind
504 when choosing a value for this option.
507 bool "Enable LoongArch DMW-based ioremap()"
509 We use generic TLB-based ioremap() by default since it has page
510 protection support. However, you can enable LoongArch DMW-based
511 ioremap() for better performance.
513 config ARCH_WRITECOMBINE
514 bool "Enable WriteCombine (WUC) for ioremap()"
516 LoongArch maintains cache coherency in hardware, but when paired
517 with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which
518 is similar to WriteCombine) is out of the scope of cache coherency
519 machanism for PCIe devices (this is a PCIe protocol violation, which
520 may be fixed in newer chipsets).
522 This means WUC can only used for write-only memory regions now, so
523 this option is disabled by default, making WUC silently fallback to
524 SUC for ioremap(). You can enable this option if the kernel is ensured
525 to run on hardware without this bug.
527 You can override this setting via writecombine=on/off boot parameter.
529 config ARCH_STRICT_ALIGN
530 bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT
533 Not all LoongArch cores support h/w unaligned access, we can use
534 -mstrict-align build parameter to prevent unaligned accesses.
536 CPUs with h/w unaligned access support:
537 Loongson-2K2000/2K3000/3A5000/3C5000/3D5000.
539 CPUs without h/w unaligned access support:
540 Loongson-2K500/2K1000.
542 This option is enabled by default to make the kernel be able to run
543 on all LoongArch systems. But you can disable it manually if you want
544 to run kernel only on systems with h/w unaligned access support in
545 order to optimise for performance.
552 bool "Support for the Loongson SIMD Extension"
553 depends on AS_HAS_LSX_EXTENSION
555 Loongson SIMD Extension (LSX) introduces 128 bit wide vector registers
556 and a set of SIMD instructions to operate on them. When this option
557 is enabled the kernel will support allocating & switching LSX
558 vector register contexts. If you know that your kernel will only be
559 running on CPUs which do not support LSX or that your userland will
560 not be making use of it then you may wish to say N here to reduce
561 the size & complexity of your kernel.
566 bool "Support for the Loongson Advanced SIMD Extension"
567 depends on CPU_HAS_LSX
568 depends on AS_HAS_LASX_EXTENSION
570 Loongson Advanced SIMD Extension (LASX) introduces 256 bit wide vector
571 registers and a set of SIMD instructions to operate on them. When this
572 option is enabled the kernel will support allocating & switching LASX
573 vector register contexts. If you know that your kernel will only be
574 running on CPUs which do not support LASX or that your userland will
575 not be making use of it then you may wish to say N here to reduce
576 the size & complexity of your kernel.
581 bool "Support for the Loongson Binary Translation Extension"
582 depends on AS_HAS_LBT_EXTENSION
584 Loongson Binary Translation (LBT) introduces 4 scratch registers (SCR0
585 to SCR3), x86/ARM eflags (eflags) and x87 fpu stack pointer (ftop).
586 Enabling this option allows the kernel to allocate and switch registers
589 If you want to use this feature, such as the Loongson Architecture
590 Translator (LAT), say Y.
592 config CPU_HAS_PREFETCH
596 config ARCH_SUPPORTS_KEXEC
599 config ARCH_SUPPORTS_CRASH_DUMP
602 config ARCH_SELECTS_CRASH_DUMP
604 depends on CRASH_DUMP
607 config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
611 bool "Relocatable kernel"
613 This builds the kernel as a Position Independent Executable (PIE),
614 which retains all relocation metadata required, so as to relocate
615 the kernel binary at runtime to a different virtual address from
618 config RANDOMIZE_BASE
619 bool "Randomize the address of the kernel (KASLR)"
620 depends on RELOCATABLE
622 Randomizes the physical and virtual address at which the
623 kernel image is loaded, as a security feature that
624 deters exploit attempts relying on knowledge of the location
627 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET.
631 config RANDOMIZE_BASE_MAX_OFFSET
632 hex "Maximum KASLR offset" if EXPERT
633 depends on RANDOMIZE_BASE
637 When KASLR is active, this provides the maximum offset that will
638 be applied to the kernel image. It should be set according to the
639 amount of physical RAM available in the target system.
641 This is limited by the size of the lower address memory, 256MB.
643 source "kernel/livepatch/Kconfig"
647 config ARCH_SELECT_MEMORY_MODEL
650 config ARCH_FLATMEM_ENABLE
654 config ARCH_SPARSEMEM_ENABLE
656 select SPARSEMEM_VMEMMAP_ENABLE
658 Say Y to support efficient handling of sparse physical memory,
659 for architectures which are either NUMA (Non-Uniform Memory Access)
660 or have huge holes in the physical address space for other reasons.
661 See <file:Documentation/mm/numa.rst> for more.
663 config ARCH_MEMORY_PROBE
665 depends on MEMORY_HOTPLUG
671 config ARCH_MMAP_RND_BITS_MIN
674 config ARCH_MMAP_RND_BITS_MAX
677 config ARCH_SUPPORTS_UPROBES
680 config KASAN_SHADOW_OFFSET
685 menu "Power management options"
687 config ARCH_SUSPEND_POSSIBLE
690 config ARCH_HIBERNATION_POSSIBLE
693 source "kernel/power/Kconfig"
694 source "drivers/acpi/Kconfig"
698 source "arch/loongarch/kvm/Kconfig"