1 # SPDX-License-Identifier: GPL-2.0
6 select ACPI_GENERIC_GSI if ACPI
7 select ACPI_MCFG if ACPI
8 select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
9 select ARCH_BINFMT_ELF_STATE
10 select ARCH_ENABLE_MEMORY_HOTPLUG
11 select ARCH_ENABLE_MEMORY_HOTREMOVE
12 select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
13 select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
14 select ARCH_HAS_PTE_SPECIAL
15 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
16 select ARCH_INLINE_READ_LOCK if !PREEMPTION
17 select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION
18 select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION
19 select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION
20 select ARCH_INLINE_READ_UNLOCK if !PREEMPTION
21 select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION
22 select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION
23 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION
24 select ARCH_INLINE_WRITE_LOCK if !PREEMPTION
25 select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION
26 select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION
27 select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION
28 select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION
29 select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION
30 select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION
31 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION
32 select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION
33 select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION
34 select ARCH_INLINE_SPIN_LOCK if !PREEMPTION
35 select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION
36 select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION
37 select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION
38 select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION
39 select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION
40 select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION
41 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION
42 select ARCH_KEEP_MEMBLOCK
43 select ARCH_MIGHT_HAVE_PC_PARPORT
44 select ARCH_MIGHT_HAVE_PC_SERIO
45 select ARCH_SPARSEMEM_ENABLE
47 select ARCH_SUPPORTS_ACPI
48 select ARCH_SUPPORTS_ATOMIC_RMW
49 select ARCH_SUPPORTS_HUGETLBFS
50 select ARCH_SUPPORTS_NUMA_BALANCING
51 select ARCH_USE_BUILTIN_BSWAP
52 select ARCH_USE_CMPXCHG_LOCKREF
53 select ARCH_USE_QUEUED_RWLOCKS
54 select ARCH_USE_QUEUED_SPINLOCKS
55 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
56 select ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
57 select ARCH_WANT_LD_ORPHAN_WARN
58 select ARCH_WANTS_NO_INSTR
59 select BUILDTIME_TABLE_SORT
63 select GENERIC_CLOCKEVENTS
64 select GENERIC_CMOS_UPDATE
65 select GENERIC_CPU_AUTOPROBE
67 select GENERIC_GETTIMEOFDAY
68 select GENERIC_IOREMAP if !ARCH_IOREMAP
69 select GENERIC_IRQ_MULTI_HANDLER
70 select GENERIC_IRQ_PROBE
71 select GENERIC_IRQ_SHOW
72 select GENERIC_LIB_ASHLDI3
73 select GENERIC_LIB_ASHRDI3
74 select GENERIC_LIB_CMPDI2
75 select GENERIC_LIB_LSHRDI3
76 select GENERIC_LIB_UCMPDI2
77 select GENERIC_LIB_DEVMEM_IS_ALLOWED
78 select GENERIC_PCI_IOMAP
79 select GENERIC_SCHED_CLOCK
80 select GENERIC_SMP_IDLE_THREAD
81 select GENERIC_TIME_VSYSCALL
84 select HAVE_ARCH_AUDITSYSCALL
85 select HAVE_ARCH_MMAP_RND_BITS if MMU
86 select HAVE_ARCH_SECCOMP_FILTER
87 select HAVE_ARCH_TRACEHOOK
88 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
89 select HAVE_ASM_MODVERSIONS
90 select HAVE_CONTEXT_TRACKING_USER
91 select HAVE_C_RECORDMCOUNT
92 select HAVE_DEBUG_STACKOVERFLOW
93 select HAVE_DMA_CONTIGUOUS
94 select HAVE_DYNAMIC_FTRACE
95 select HAVE_DYNAMIC_FTRACE_WITH_ARGS
96 select HAVE_DYNAMIC_FTRACE_WITH_REGS
98 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !ARCH_STRICT_ALIGN
99 select HAVE_EXIT_THREAD
101 select HAVE_FTRACE_MCOUNT_RECORD
102 select HAVE_FUNCTION_ARG_ACCESS_API
103 select HAVE_FUNCTION_GRAPH_TRACER
104 select HAVE_FUNCTION_TRACER
105 select HAVE_GENERIC_VDSO
106 select HAVE_HW_BREAKPOINT if PERF_EVENTS
107 select HAVE_IOREMAP_PROT
108 select HAVE_IRQ_EXIT_ON_IRQ_STACK
109 select HAVE_IRQ_TIME_ACCOUNTING
111 select HAVE_KPROBES_ON_FTRACE
112 select HAVE_KRETPROBES
113 select HAVE_MOD_ARCH_SPECIFIC
116 select HAVE_PERF_EVENTS
117 select HAVE_PERF_REGS
118 select HAVE_PERF_USER_STACK_DUMP
119 select HAVE_REGS_AND_STACK_ACCESS_API
121 select HAVE_SETUP_PER_CPU_AREA if NUMA
122 select HAVE_STACKPROTECTOR
123 select HAVE_SYSCALL_TRACEPOINTS
125 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP
126 select IRQ_FORCED_THREADING
127 select IRQ_LOONGARCH_CPU
128 select MMU_GATHER_MERGE_VMAS if MMU
129 select MODULES_USE_ELF_RELA if MODULES
130 select NEED_PER_CPU_EMBED_FIRST_CHUNK
131 select NEED_PER_CPU_PAGE_FIRST_CHUNK
133 select OF_EARLY_FLATTREE
135 select PCI_DOMAINS_GENERIC
136 select PCI_ECAM if ACPI
138 select PCI_MSI_ARCH_FALLBACKS
140 select PERF_USE_VMALLOC
144 select SYSCTL_ARCH_UNALIGN_ALLOW
145 select SYSCTL_ARCH_UNALIGN_NO_WARN
146 select SYSCTL_EXCEPTION_TRACE
148 select TRACE_IRQFLAGS_SUPPORT
149 select USE_PERCPU_NUMA_NODE_ID
150 select USER_STACKTRACE_SUPPORT
163 config CPU_HAS_PREFETCH
171 config GENERIC_BUG_RELATIVE_POINTERS
173 depends on GENERIC_BUG
175 config GENERIC_CALIBRATE_DELAY
181 config GENERIC_HWEIGHT
184 config L1_CACHE_SHIFT
188 config LOCKDEP_SUPPORT
192 config STACKTRACE_SUPPORT
196 # MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the
197 # MIPS Loongson code, to preserve Loongson-specific code paths in drivers that
198 # are shared between architectures, and specifically expecting the symbols.
199 config MACH_LOONGSON32
202 config MACH_LOONGSON64
205 config FIX_EARLYCON_MEM
211 config PAGE_SIZE_16KB
214 config PAGE_SIZE_64KB
217 config PGTABLE_2LEVEL
220 config PGTABLE_3LEVEL
223 config PGTABLE_4LEVEL
226 config PGTABLE_LEVELS
228 default 2 if PGTABLE_2LEVEL
229 default 3 if PGTABLE_3LEVEL
230 default 4 if PGTABLE_4LEVEL
232 config SCHED_OMIT_FRAME_POINTER
236 config AS_HAS_EXPLICIT_RELOCS
237 def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x))
239 menu "Kernel type and options"
241 source "kernel/Kconfig.hz"
244 prompt "Page Table Layout"
245 default 16KB_2LEVEL if 32BIT
246 default 16KB_3LEVEL if 64BIT
248 Allows choosing the page table layout, which is a combination
249 of page size and page table levels. The size of virtual memory
250 address space are determined by the page table layout.
253 bool "4KB with 3 levels"
255 select PGTABLE_3LEVEL
257 This option selects 4KB page size with 3 level page tables, which
258 support a maximum of 39 bits of application virtual memory.
261 bool "4KB with 4 levels"
263 select PGTABLE_4LEVEL
265 This option selects 4KB page size with 4 level page tables, which
266 support a maximum of 48 bits of application virtual memory.
269 bool "16KB with 2 levels"
270 select PAGE_SIZE_16KB
271 select PGTABLE_2LEVEL
273 This option selects 16KB page size with 2 level page tables, which
274 support a maximum of 36 bits of application virtual memory.
277 bool "16KB with 3 levels"
278 select PAGE_SIZE_16KB
279 select PGTABLE_3LEVEL
281 This option selects 16KB page size with 3 level page tables, which
282 support a maximum of 47 bits of application virtual memory.
285 bool "64KB with 2 levels"
286 select PAGE_SIZE_64KB
287 select PGTABLE_2LEVEL
289 This option selects 64KB page size with 2 level page tables, which
290 support a maximum of 42 bits of application virtual memory.
293 bool "64KB with 3 levels"
294 select PAGE_SIZE_64KB
295 select PGTABLE_3LEVEL
297 This option selects 64KB page size with 3 level page tables, which
298 support a maximum of 55 bits of application virtual memory.
303 string "Built-in kernel command line"
305 For most platforms, the arguments for the kernel's command line
306 are provided at run-time, during boot. However, there are cases
307 where either no arguments are being provided or the provided
308 arguments are insufficient or even invalid.
310 When that occurs, it is possible to define a built-in command
311 line here and choose how the kernel should use it later on.
314 prompt "Kernel command line type"
315 default CMDLINE_BOOTLOADER
317 Choose how the kernel will handle the provided built-in command
320 config CMDLINE_BOOTLOADER
321 bool "Use bootloader kernel arguments if available"
323 Prefer the command-line passed by the boot loader if available.
324 Use the built-in command line as fallback in case we get nothing
325 during boot. This is the default behaviour.
327 config CMDLINE_EXTEND
328 bool "Use built-in to extend bootloader kernel arguments"
330 The command-line arguments provided during boot will be
331 appended to the built-in command line. This is useful in
332 cases where the provided arguments are insufficient and
333 you don't want to or cannot modify them.
336 bool "Always use the built-in kernel command string"
338 Always use the built-in command line, even if we get one during
339 boot. This is useful in case you need to override the provided
340 command line on systems where you don't have or want control
346 bool "Enable DMI scanning"
347 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
350 This enables SMBIOS/DMI feature for systems, and scanning of
351 DMI to identify machine quirks.
354 bool "EFI runtime service support"
356 select EFI_RUNTIME_WRAPPERS
358 This enables the kernel to use EFI runtime services that are
359 available (such as the EFI variable services).
362 bool "EFI boot stub support"
365 select EFI_GENERIC_STUB
367 This kernel feature allows the kernel to be loaded directly by
368 EFI firmware without the use of a bootloader.
371 bool "Multi-Processing support"
373 This enables support for systems with more than one CPU. If you have
374 a system with only one CPU, say N. If you have a system with more
377 If you say N here, the kernel will run on uni- and multiprocessor
378 machines, but will use only one CPU of a multiprocessor machine. If
379 you say Y here, the kernel will run on many, but not all,
380 uniprocessor machines. On a uniprocessor machine, the kernel
381 will run faster if you say N here.
383 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>.
385 If you don't know what to do here, say N.
388 bool "Support for hot-pluggable CPUs"
390 select GENERIC_IRQ_MIGRATION
392 Say Y here to allow turning CPUs off and on. CPUs can be
393 controlled through /sys/devices/system/cpu.
394 (Note: power management support will enable this option
395 automatically on SMP systems. )
396 Say N if you want to disable CPU hotplug.
399 int "Maximum number of CPUs (2-256)"
404 This allows you to specify the maximum number of CPUs which this
410 select ACPI_NUMA if ACPI
412 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access)
413 support. This option improves performance on systems with more
414 than one NUMA node; on single node systems it is generally better
415 to leave it disabled.
422 config ARCH_FORCE_MAX_ORDER
423 int "Maximum zone order"
424 range 14 64 if PAGE_SIZE_64KB
425 default "14" if PAGE_SIZE_64KB
426 range 12 64 if PAGE_SIZE_16KB
427 default "12" if PAGE_SIZE_16KB
431 The kernel memory allocator divides physically contiguous memory
432 blocks into "zones", where each zone is a power of two number of
433 pages. This option selects the largest power of two that the kernel
434 keeps in the memory allocator. If you need to allocate very large
435 blocks of physically contiguous memory, then you may need to
438 This config option is actually maximum order plus one. For example,
439 a value of 11 means that the largest free memory block is 2^10 pages.
441 The page size is not necessarily 4KB. Keep this in mind
442 when choosing a value for this option.
445 bool "Enable LoongArch DMW-based ioremap()"
447 We use generic TLB-based ioremap() by default since it has page
448 protection support. However, you can enable LoongArch DMW-based
449 ioremap() for better performance.
451 config ARCH_WRITECOMBINE
452 bool "Enable WriteCombine (WUC) for ioremap()"
454 LoongArch maintains cache coherency in hardware, but when paired
455 with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which
456 is similar to WriteCombine) is out of the scope of cache coherency
457 machanism for PCIe devices (this is a PCIe protocol violation, which
458 may be fixed in newer chipsets).
460 This means WUC can only used for write-only memory regions now, so
461 this option is disabled by default, making WUC silently fallback to
462 SUC for ioremap(). You can enable this option if the kernel is ensured
463 to run on hardware without this bug.
465 You can override this setting via writecombine=on/off boot parameter.
467 config ARCH_STRICT_ALIGN
468 bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT
471 Not all LoongArch cores support h/w unaligned access, we can use
472 -mstrict-align build parameter to prevent unaligned accesses.
474 CPUs with h/w unaligned access support:
475 Loongson-2K2000/2K3000/3A5000/3C5000/3D5000.
477 CPUs without h/w unaligned access support:
478 Loongson-2K500/2K1000.
480 This option is enabled by default to make the kernel be able to run
481 on all LoongArch systems. But you can disable it manually if you want
482 to run kernel only on systems with h/w unaligned access support in
483 order to optimise for performance.
486 bool "Kexec system call"
489 kexec is a system call that implements the ability to shutdown your
490 current kernel, and to start another kernel. It is like a reboot
491 but it is independent of the system firmware. And like a reboot
492 you can start any kernel with it, not just Linux.
494 The name comes from the similarity to the exec system call.
497 bool "Build kdump crash kernel"
500 Generate crash dump after being started by kexec. This should
501 be normally only set in special crash dump kernels which are
502 loaded in the main kernel with kexec-tools into a specially
503 reserved region and then later executed after a crash by
506 For more details see Documentation/admin-guide/kdump/kdump.rst
509 bool "Relocatable kernel"
511 This builds the kernel as a Position Independent Executable (PIE),
512 which retains all relocation metadata required, so as to relocate
513 the kernel binary at runtime to a different virtual address from
516 config RANDOMIZE_BASE
517 bool "Randomize the address of the kernel (KASLR)"
518 depends on RELOCATABLE
520 Randomizes the physical and virtual address at which the
521 kernel image is loaded, as a security feature that
522 deters exploit attempts relying on knowledge of the location
525 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET.
529 config RANDOMIZE_BASE_MAX_OFFSET
530 hex "Maximum KASLR offset" if EXPERT
531 depends on RANDOMIZE_BASE
535 When KASLR is active, this provides the maximum offset that will
536 be applied to the kernel image. It should be set according to the
537 amount of physical RAM available in the target system.
539 This is limited by the size of the lower address memory, 256MB.
542 bool "Enable seccomp to safely compute untrusted bytecode"
546 This kernel feature is useful for number crunching applications
547 that may need to compute untrusted bytecode during their
548 execution. By using pipes or other transports made available to
549 the process as file descriptors supporting the read/write
550 syscalls, it's possible to isolate those applications in
551 their own address space using seccomp. Once seccomp is
552 enabled via /proc/<pid>/seccomp, it cannot be disabled
553 and the task is only allowed to execute a few safe syscalls
554 defined by each seccomp mode.
556 If unsure, say Y. Only embedded should say N here.
560 config ARCH_SELECT_MEMORY_MODEL
563 config ARCH_FLATMEM_ENABLE
567 config ARCH_SPARSEMEM_ENABLE
569 select SPARSEMEM_VMEMMAP_ENABLE
571 Say Y to support efficient handling of sparse physical memory,
572 for architectures which are either NUMA (Non-Uniform Memory Access)
573 or have huge holes in the physical address space for other reasons.
574 See <file:Documentation/mm/numa.rst> for more.
576 config ARCH_ENABLE_THP_MIGRATION
578 depends on TRANSPARENT_HUGEPAGE
580 config ARCH_MEMORY_PROBE
582 depends on MEMORY_HOTPLUG
588 config ARCH_MMAP_RND_BITS_MIN
591 config ARCH_MMAP_RND_BITS_MAX
594 menu "Power management options"
596 config ARCH_SUSPEND_POSSIBLE
599 config ARCH_HIBERNATION_POSSIBLE
602 source "kernel/power/Kconfig"
603 source "drivers/acpi/Kconfig"
607 source "drivers/firmware/Kconfig"