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_HAS_ACPI_TABLE_UPGRADE if ACPI
16 select ARCH_HAS_CPU_FINALIZE_INIT
17 select ARCH_HAS_FORTIFY_SOURCE
19 select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
20 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
21 select ARCH_HAS_PTE_SPECIAL
22 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
23 select ARCH_INLINE_READ_LOCK if !PREEMPTION
24 select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION
25 select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION
26 select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION
27 select ARCH_INLINE_READ_UNLOCK if !PREEMPTION
28 select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION
29 select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION
30 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION
31 select ARCH_INLINE_WRITE_LOCK if !PREEMPTION
32 select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION
33 select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION
34 select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION
35 select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION
36 select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION
37 select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION
38 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION
39 select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION
40 select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION
41 select ARCH_INLINE_SPIN_LOCK if !PREEMPTION
42 select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION
43 select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION
44 select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION
45 select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION
46 select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION
47 select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION
48 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION
49 select ARCH_KEEP_MEMBLOCK
50 select ARCH_MIGHT_HAVE_PC_PARPORT
51 select ARCH_MIGHT_HAVE_PC_SERIO
52 select ARCH_SPARSEMEM_ENABLE
54 select ARCH_SUPPORTS_ACPI
55 select ARCH_SUPPORTS_ATOMIC_RMW
56 select ARCH_SUPPORTS_HUGETLBFS
57 select ARCH_SUPPORTS_LTO_CLANG
58 select ARCH_SUPPORTS_LTO_CLANG_THIN
59 select ARCH_SUPPORTS_NUMA_BALANCING
60 select ARCH_USE_BUILTIN_BSWAP
61 select ARCH_USE_CMPXCHG_LOCKREF
62 select ARCH_USE_QUEUED_RWLOCKS
63 select ARCH_USE_QUEUED_SPINLOCKS
64 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
65 select ARCH_WANT_LD_ORPHAN_WARN
66 select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
67 select ARCH_WANTS_NO_INSTR
68 select BUILDTIME_TABLE_SORT
72 select GENERIC_CLOCKEVENTS
73 select GENERIC_CMOS_UPDATE
74 select GENERIC_CPU_AUTOPROBE
75 select GENERIC_CPU_DEVICES
77 select GENERIC_GETTIMEOFDAY
78 select GENERIC_IOREMAP if !ARCH_IOREMAP
79 select GENERIC_IRQ_MULTI_HANDLER
80 select GENERIC_IRQ_PROBE
81 select GENERIC_IRQ_SHOW
82 select GENERIC_LIB_ASHLDI3
83 select GENERIC_LIB_ASHRDI3
84 select GENERIC_LIB_CMPDI2
85 select GENERIC_LIB_LSHRDI3
86 select GENERIC_LIB_UCMPDI2
87 select GENERIC_LIB_DEVMEM_IS_ALLOWED
88 select GENERIC_PCI_IOMAP
89 select GENERIC_SCHED_CLOCK
90 select GENERIC_SMP_IDLE_THREAD
91 select GENERIC_TIME_VSYSCALL
92 select GENERIC_VDSO_TIME_NS
95 select HAVE_ARCH_AUDITSYSCALL
96 select HAVE_ARCH_JUMP_LABEL
97 select HAVE_ARCH_JUMP_LABEL_RELATIVE
98 select HAVE_ARCH_KASAN
99 select HAVE_ARCH_KFENCE
100 select HAVE_ARCH_KGDB if PERF_EVENTS
101 select HAVE_ARCH_MMAP_RND_BITS if MMU
102 select HAVE_ARCH_SECCOMP_FILTER
103 select HAVE_ARCH_TRACEHOOK
104 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
105 select HAVE_ASM_MODVERSIONS
106 select HAVE_CONTEXT_TRACKING_USER
107 select HAVE_C_RECORDMCOUNT
108 select HAVE_DEBUG_KMEMLEAK
109 select HAVE_DEBUG_STACKOVERFLOW
110 select HAVE_DMA_CONTIGUOUS
111 select HAVE_DYNAMIC_FTRACE
112 select HAVE_DYNAMIC_FTRACE_WITH_ARGS
113 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
114 select HAVE_DYNAMIC_FTRACE_WITH_REGS
116 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !ARCH_STRICT_ALIGN
117 select HAVE_EXIT_THREAD
119 select HAVE_FTRACE_MCOUNT_RECORD
120 select HAVE_FUNCTION_ARG_ACCESS_API
121 select HAVE_FUNCTION_ERROR_INJECTION
122 select HAVE_FUNCTION_GRAPH_RETVAL if HAVE_FUNCTION_GRAPH_TRACER
123 select HAVE_FUNCTION_GRAPH_TRACER
124 select HAVE_FUNCTION_TRACER
125 select HAVE_GCC_PLUGINS
126 select HAVE_GENERIC_VDSO
127 select HAVE_HW_BREAKPOINT if PERF_EVENTS
128 select HAVE_IOREMAP_PROT
129 select HAVE_IRQ_EXIT_ON_IRQ_STACK
130 select HAVE_IRQ_TIME_ACCOUNTING
132 select HAVE_KPROBES_ON_FTRACE
133 select HAVE_KRETPROBES
135 select HAVE_MOD_ARCH_SPECIFIC
138 select HAVE_PERF_EVENTS
139 select HAVE_PERF_REGS
140 select HAVE_PERF_USER_STACK_DUMP
141 select HAVE_PREEMPT_DYNAMIC_KEY
142 select HAVE_REGS_AND_STACK_ACCESS_API
146 select HAVE_SAMPLE_FTRACE_DIRECT
147 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
148 select HAVE_SETUP_PER_CPU_AREA if NUMA
149 select HAVE_STACKPROTECTOR
150 select HAVE_SYSCALL_TRACEPOINTS
152 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP
153 select IRQ_FORCED_THREADING
154 select IRQ_LOONGARCH_CPU
155 select LOCK_MM_AND_FIND_VMA
156 select MMU_GATHER_MERGE_VMAS if MMU
157 select MODULES_USE_ELF_RELA if MODULES
158 select NEED_PER_CPU_EMBED_FIRST_CHUNK
159 select NEED_PER_CPU_PAGE_FIRST_CHUNK
161 select OF_EARLY_FLATTREE
163 select PCI_DOMAINS_GENERIC
164 select PCI_ECAM if ACPI
166 select PCI_MSI_ARCH_FALLBACKS
168 select PERF_USE_VMALLOC
172 select SYSCTL_ARCH_UNALIGN_ALLOW
173 select SYSCTL_ARCH_UNALIGN_NO_WARN
174 select SYSCTL_EXCEPTION_TRACE
176 select TRACE_IRQFLAGS_SUPPORT
177 select USE_PERCPU_NUMA_NODE_ID
178 select USER_STACKTRACE_SUPPORT
191 config GENERIC_BUG_RELATIVE_POINTERS
193 depends on GENERIC_BUG
195 config GENERIC_CALIBRATE_DELAY
201 config GENERIC_HWEIGHT
204 config L1_CACHE_SHIFT
208 config LOCKDEP_SUPPORT
212 config STACKTRACE_SUPPORT
216 # MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the
217 # MIPS Loongson code, to preserve Loongson-specific code paths in drivers that
218 # are shared between architectures, and specifically expecting the symbols.
219 config MACH_LOONGSON32
222 config MACH_LOONGSON64
225 config FIX_EARLYCON_MEM
231 config PAGE_SIZE_16KB
234 config PAGE_SIZE_64KB
237 config PGTABLE_2LEVEL
240 config PGTABLE_3LEVEL
243 config PGTABLE_4LEVEL
246 config PGTABLE_LEVELS
248 default 2 if PGTABLE_2LEVEL
249 default 3 if PGTABLE_3LEVEL
250 default 4 if PGTABLE_4LEVEL
252 config SCHED_OMIT_FRAME_POINTER
256 config AS_HAS_EXPLICIT_RELOCS
257 def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x))
259 config AS_HAS_FCSR_CLASS
260 def_bool $(as-instr,movfcsr2gr \$t0$(comma)\$fcsr0)
262 config AS_HAS_LSX_EXTENSION
263 def_bool $(as-instr,vld \$vr0$(comma)\$a0$(comma)0)
265 config AS_HAS_LASX_EXTENSION
266 def_bool $(as-instr,xvld \$xr0$(comma)\$a0$(comma)0)
268 config AS_HAS_LBT_EXTENSION
269 def_bool $(as-instr,movscr2gr \$a0$(comma)\$scr0)
271 config AS_HAS_LVZ_EXTENSION
272 def_bool $(as-instr,hvcl 0)
274 menu "Kernel type and options"
276 source "kernel/Kconfig.hz"
279 prompt "Page Table Layout"
280 default 16KB_2LEVEL if 32BIT
281 default 16KB_3LEVEL if 64BIT
283 Allows choosing the page table layout, which is a combination
284 of page size and page table levels. The size of virtual memory
285 address space are determined by the page table layout.
288 bool "4KB with 3 levels"
290 select PGTABLE_3LEVEL
292 This option selects 4KB page size with 3 level page tables, which
293 support a maximum of 39 bits of application virtual memory.
296 bool "4KB with 4 levels"
298 select PGTABLE_4LEVEL
300 This option selects 4KB page size with 4 level page tables, which
301 support a maximum of 48 bits of application virtual memory.
304 bool "16KB with 2 levels"
305 select PAGE_SIZE_16KB
306 select PGTABLE_2LEVEL
308 This option selects 16KB page size with 2 level page tables, which
309 support a maximum of 36 bits of application virtual memory.
312 bool "16KB with 3 levels"
313 select PAGE_SIZE_16KB
314 select PGTABLE_3LEVEL
316 This option selects 16KB page size with 3 level page tables, which
317 support a maximum of 47 bits of application virtual memory.
320 bool "64KB with 2 levels"
321 select PAGE_SIZE_64KB
322 select PGTABLE_2LEVEL
324 This option selects 64KB page size with 2 level page tables, which
325 support a maximum of 42 bits of application virtual memory.
328 bool "64KB with 3 levels"
329 select PAGE_SIZE_64KB
330 select PGTABLE_3LEVEL
332 This option selects 64KB page size with 3 level page tables, which
333 support a maximum of 55 bits of application virtual memory.
338 string "Built-in kernel command line"
340 For most platforms, the arguments for the kernel's command line
341 are provided at run-time, during boot. However, there are cases
342 where either no arguments are being provided or the provided
343 arguments are insufficient or even invalid.
345 When that occurs, it is possible to define a built-in command
346 line here and choose how the kernel should use it later on.
349 prompt "Kernel command line type"
350 default CMDLINE_BOOTLOADER
352 Choose how the kernel will handle the provided built-in command
355 config CMDLINE_BOOTLOADER
356 bool "Use bootloader kernel arguments if available"
358 Prefer the command-line passed by the boot loader if available.
359 Use the built-in command line as fallback in case we get nothing
360 during boot. This is the default behaviour.
362 config CMDLINE_EXTEND
363 bool "Use built-in to extend bootloader kernel arguments"
365 The command-line arguments provided during boot will be
366 appended to the built-in command line. This is useful in
367 cases where the provided arguments are insufficient and
368 you don't want to or cannot modify them.
371 bool "Always use the built-in kernel command string"
373 Always use the built-in command line, even if we get one during
374 boot. This is useful in case you need to override the provided
375 command line on systems where you don't have or want control
381 bool "Enable built-in dtb in kernel"
384 Some existing systems do not provide a canonical device tree to
385 the kernel at boot time. Let's provide a device tree table in the
386 kernel, keyed by the dts filename, containing the relevant DTBs.
388 Built-in DTBs are generic enough and can be used as references.
390 config BUILTIN_DTB_NAME
391 string "Source file for built-in dtb"
392 depends on BUILTIN_DTB
394 Base name (without suffix, relative to arch/loongarch/boot/dts/)
395 for the DTS file that will be used to produce the DTB linked into
399 bool "Enable DMI scanning"
400 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
403 This enables SMBIOS/DMI feature for systems, and scanning of
404 DMI to identify machine quirks.
407 bool "EFI runtime service support"
409 select EFI_RUNTIME_WRAPPERS
411 This enables the kernel to use EFI runtime services that are
412 available (such as the EFI variable services).
415 bool "EFI boot stub support"
418 select EFI_GENERIC_STUB
420 This kernel feature allows the kernel to be loaded directly by
421 EFI firmware without the use of a bootloader.
424 bool "SMT scheduler support"
427 Improves scheduler's performance when there are multiple
428 threads in one physical core.
431 bool "Multi-Processing support"
433 This enables support for systems with more than one CPU. If you have
434 a system with only one CPU, say N. If you have a system with more
437 If you say N here, the kernel will run on uni- and multiprocessor
438 machines, but will use only one CPU of a multiprocessor machine. If
439 you say Y here, the kernel will run on many, but not all,
440 uniprocessor machines. On a uniprocessor machine, the kernel
441 will run faster if you say N here.
443 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>.
445 If you don't know what to do here, say N.
448 bool "Support for hot-pluggable CPUs"
450 select GENERIC_IRQ_MIGRATION
452 Say Y here to allow turning CPUs off and on. CPUs can be
453 controlled through /sys/devices/system/cpu.
454 (Note: power management support will enable this option
455 automatically on SMP systems. )
456 Say N if you want to disable CPU hotplug.
459 int "Maximum number of CPUs (2-256)"
464 This allows you to specify the maximum number of CPUs which this
470 select ACPI_NUMA if ACPI
472 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access)
473 support. This option improves performance on systems with more
474 than one NUMA node; on single node systems it is generally better
475 to leave it disabled.
482 config ARCH_FORCE_MAX_ORDER
483 int "Maximum zone order"
484 default "13" if PAGE_SIZE_64KB
485 default "11" if PAGE_SIZE_16KB
488 The kernel memory allocator divides physically contiguous memory
489 blocks into "zones", where each zone is a power of two number of
490 pages. This option selects the largest power of two that the kernel
491 keeps in the memory allocator. If you need to allocate very large
492 blocks of physically contiguous memory, then you may need to
495 The page size is not necessarily 4KB. Keep this in mind
496 when choosing a value for this option.
499 bool "Enable LoongArch DMW-based ioremap()"
501 We use generic TLB-based ioremap() by default since it has page
502 protection support. However, you can enable LoongArch DMW-based
503 ioremap() for better performance.
505 config ARCH_WRITECOMBINE
506 bool "Enable WriteCombine (WUC) for ioremap()"
508 LoongArch maintains cache coherency in hardware, but when paired
509 with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which
510 is similar to WriteCombine) is out of the scope of cache coherency
511 machanism for PCIe devices (this is a PCIe protocol violation, which
512 may be fixed in newer chipsets).
514 This means WUC can only used for write-only memory regions now, so
515 this option is disabled by default, making WUC silently fallback to
516 SUC for ioremap(). You can enable this option if the kernel is ensured
517 to run on hardware without this bug.
519 You can override this setting via writecombine=on/off boot parameter.
521 config ARCH_STRICT_ALIGN
522 bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT
525 Not all LoongArch cores support h/w unaligned access, we can use
526 -mstrict-align build parameter to prevent unaligned accesses.
528 CPUs with h/w unaligned access support:
529 Loongson-2K2000/2K3000/3A5000/3C5000/3D5000.
531 CPUs without h/w unaligned access support:
532 Loongson-2K500/2K1000.
534 This option is enabled by default to make the kernel be able to run
535 on all LoongArch systems. But you can disable it manually if you want
536 to run kernel only on systems with h/w unaligned access support in
537 order to optimise for performance.
544 bool "Support for the Loongson SIMD Extension"
545 depends on AS_HAS_LSX_EXTENSION
547 Loongson SIMD Extension (LSX) introduces 128 bit wide vector registers
548 and a set of SIMD instructions to operate on them. When this option
549 is enabled the kernel will support allocating & switching LSX
550 vector register contexts. If you know that your kernel will only be
551 running on CPUs which do not support LSX or that your userland will
552 not be making use of it then you may wish to say N here to reduce
553 the size & complexity of your kernel.
558 bool "Support for the Loongson Advanced SIMD Extension"
559 depends on CPU_HAS_LSX
560 depends on AS_HAS_LASX_EXTENSION
562 Loongson Advanced SIMD Extension (LASX) introduces 256 bit wide vector
563 registers and a set of SIMD instructions to operate on them. When this
564 option is enabled the kernel will support allocating & switching LASX
565 vector register contexts. If you know that your kernel will only be
566 running on CPUs which do not support LASX or that your userland will
567 not be making use of it then you may wish to say N here to reduce
568 the size & complexity of your kernel.
573 bool "Support for the Loongson Binary Translation Extension"
574 depends on AS_HAS_LBT_EXTENSION
576 Loongson Binary Translation (LBT) introduces 4 scratch registers (SCR0
577 to SCR3), x86/ARM eflags (eflags) and x87 fpu stack pointer (ftop).
578 Enabling this option allows the kernel to allocate and switch registers
581 If you want to use this feature, such as the Loongson Architecture
582 Translator (LAT), say Y.
584 config CPU_HAS_PREFETCH
588 config ARCH_SUPPORTS_KEXEC
591 config ARCH_SUPPORTS_CRASH_DUMP
594 config ARCH_SELECTS_CRASH_DUMP
596 depends on CRASH_DUMP
599 config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
603 bool "Relocatable kernel"
605 This builds the kernel as a Position Independent Executable (PIE),
606 which retains all relocation metadata required, so as to relocate
607 the kernel binary at runtime to a different virtual address from
610 config RANDOMIZE_BASE
611 bool "Randomize the address of the kernel (KASLR)"
612 depends on RELOCATABLE
614 Randomizes the physical and virtual address at which the
615 kernel image is loaded, as a security feature that
616 deters exploit attempts relying on knowledge of the location
619 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET.
623 config RANDOMIZE_BASE_MAX_OFFSET
624 hex "Maximum KASLR offset" if EXPERT
625 depends on RANDOMIZE_BASE
629 When KASLR is active, this provides the maximum offset that will
630 be applied to the kernel image. It should be set according to the
631 amount of physical RAM available in the target system.
633 This is limited by the size of the lower address memory, 256MB.
636 bool "Enable seccomp to safely compute untrusted bytecode"
640 This kernel feature is useful for number crunching applications
641 that may need to compute untrusted bytecode during their
642 execution. By using pipes or other transports made available to
643 the process as file descriptors supporting the read/write
644 syscalls, it's possible to isolate those applications in
645 their own address space using seccomp. Once seccomp is
646 enabled via /proc/<pid>/seccomp, it cannot be disabled
647 and the task is only allowed to execute a few safe syscalls
648 defined by each seccomp mode.
650 If unsure, say Y. Only embedded should say N here.
654 config ARCH_SELECT_MEMORY_MODEL
657 config ARCH_FLATMEM_ENABLE
661 config ARCH_SPARSEMEM_ENABLE
663 select SPARSEMEM_VMEMMAP_ENABLE
665 Say Y to support efficient handling of sparse physical memory,
666 for architectures which are either NUMA (Non-Uniform Memory Access)
667 or have huge holes in the physical address space for other reasons.
668 See <file:Documentation/mm/numa.rst> for more.
670 config ARCH_ENABLE_THP_MIGRATION
672 depends on TRANSPARENT_HUGEPAGE
674 config ARCH_MEMORY_PROBE
676 depends on MEMORY_HOTPLUG
682 config ARCH_MMAP_RND_BITS_MIN
685 config ARCH_MMAP_RND_BITS_MAX
688 config ARCH_SUPPORTS_UPROBES
691 config KASAN_SHADOW_OFFSET
696 menu "Power management options"
698 config ARCH_SUSPEND_POSSIBLE
701 config ARCH_HIBERNATION_POSSIBLE
704 source "kernel/power/Kconfig"
705 source "drivers/acpi/Kconfig"
709 source "arch/loongarch/kvm/Kconfig"