xref: /linux/arch/loongarch/Kconfig (revision 39879e3a41061e2fc8313d55bcdbed6f458ae75d)
1# SPDX-License-Identifier: GPL-2.0
2config LOONGARCH
3	bool
4	default y
5	select ACPI
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_DEBUG_VM_PGTABLE
20	select ARCH_HAS_FAST_MULTIPLIER
21	select ARCH_HAS_FORTIFY_SOURCE
22	select ARCH_HAS_KCOV
23	select ARCH_HAS_KERNEL_FPU_SUPPORT if CPU_HAS_FPU
24	select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
25	select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
26	select ARCH_HAS_PREEMPT_LAZY
27	select ARCH_HAS_PTE_SPECIAL
28	select ARCH_HAS_SET_MEMORY
29	select ARCH_HAS_SET_DIRECT_MAP
30	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
31	select ARCH_HAS_UBSAN
32	select ARCH_HAS_VDSO_ARCH_DATA
33	select ARCH_INLINE_READ_LOCK if !PREEMPTION
34	select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION
35	select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION
36	select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION
37	select ARCH_INLINE_READ_UNLOCK if !PREEMPTION
38	select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION
39	select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION
40	select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION
41	select ARCH_INLINE_WRITE_LOCK if !PREEMPTION
42	select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION
43	select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION
44	select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION
45	select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION
46	select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION
47	select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION
48	select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION
49	select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION
50	select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION
51	select ARCH_INLINE_SPIN_LOCK if !PREEMPTION
52	select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION
53	select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION
54	select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION
55	select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION
56	select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION
57	select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION
58	select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION
59	select ARCH_KEEP_MEMBLOCK
60	select ARCH_MIGHT_HAVE_PC_PARPORT
61	select ARCH_MIGHT_HAVE_PC_SERIO
62	select ARCH_SPARSEMEM_ENABLE
63	select ARCH_STACKWALK
64	select ARCH_SUPPORTS_ACPI
65	select ARCH_SUPPORTS_ATOMIC_RMW
66	select ARCH_SUPPORTS_HUGETLBFS
67	select ARCH_SUPPORTS_INT128 if CC_HAS_INT128
68	select ARCH_SUPPORTS_LTO_CLANG
69	select ARCH_SUPPORTS_LTO_CLANG_THIN
70	select ARCH_SUPPORTS_MSEAL_SYSTEM_MAPPINGS
71	select ARCH_SUPPORTS_NUMA_BALANCING
72	select ARCH_SUPPORTS_RT
73	select ARCH_USE_BUILTIN_BSWAP
74	select ARCH_USE_CMPXCHG_LOCKREF
75	select ARCH_USE_MEMTEST
76	select ARCH_USE_QUEUED_RWLOCKS
77	select ARCH_USE_QUEUED_SPINLOCKS
78	select ARCH_WANT_DEFAULT_BPF_JIT
79	select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
80	select ARCH_WANT_LD_ORPHAN_WARN
81	select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
82	select ARCH_WANTS_NO_INSTR
83	select ARCH_WANTS_THP_SWAP if HAVE_ARCH_TRANSPARENT_HUGEPAGE
84	select BUILDTIME_TABLE_SORT
85	select COMMON_CLK
86	select CPU_PM
87	select EDAC_SUPPORT
88	select EFI
89	select GENERIC_CLOCKEVENTS
90	select GENERIC_CMOS_UPDATE
91	select GENERIC_CPU_AUTOPROBE
92	select GENERIC_CPU_DEVICES
93	select GENERIC_CPU_VULNERABILITIES
94	select GENERIC_ENTRY
95	select GENERIC_GETTIMEOFDAY
96	select GENERIC_IOREMAP if !ARCH_IOREMAP
97	select GENERIC_IRQ_MATRIX_ALLOCATOR
98	select GENERIC_IRQ_MULTI_HANDLER
99	select GENERIC_IRQ_PROBE
100	select GENERIC_IRQ_SHOW
101	select GENERIC_LIB_ASHLDI3
102	select GENERIC_LIB_ASHRDI3
103	select GENERIC_LIB_CMPDI2
104	select GENERIC_LIB_LSHRDI3
105	select GENERIC_LIB_UCMPDI2
106	select GENERIC_LIB_DEVMEM_IS_ALLOWED
107	select GENERIC_PCI_IOMAP
108	select GENERIC_SCHED_CLOCK
109	select GENERIC_SMP_IDLE_THREAD
110	select GENERIC_TIME_VSYSCALL
111	select GENERIC_VDSO_DATA_STORE
112	select GENERIC_VDSO_TIME_NS
113	select GPIOLIB
114	select HAS_IOPORT
115	select HAVE_ARCH_AUDITSYSCALL
116	select HAVE_ARCH_JUMP_LABEL
117	select HAVE_ARCH_JUMP_LABEL_RELATIVE
118	select HAVE_ARCH_KASAN
119	select HAVE_ARCH_KFENCE
120	select HAVE_ARCH_KGDB if PERF_EVENTS
121	select HAVE_ARCH_KSTACK_ERASE
122	select HAVE_ARCH_MMAP_RND_BITS if MMU
123	select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
124	select HAVE_ARCH_SECCOMP
125	select HAVE_ARCH_SECCOMP_FILTER
126	select HAVE_ARCH_TRACEHOOK
127	select HAVE_ARCH_TRANSPARENT_HUGEPAGE
128	select HAVE_ARCH_USERFAULTFD_MINOR if USERFAULTFD
129	select HAVE_ASM_MODVERSIONS
130	select HAVE_CONTEXT_TRACKING_USER
131	select HAVE_C_RECORDMCOUNT
132	select HAVE_DEBUG_KMEMLEAK
133	select HAVE_DEBUG_STACKOVERFLOW
134	select HAVE_DMA_CONTIGUOUS
135	select HAVE_DYNAMIC_FTRACE
136	select HAVE_DYNAMIC_FTRACE_WITH_ARGS
137	select HAVE_FTRACE_REGS_HAVING_PT_REGS
138	select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
139	select HAVE_DYNAMIC_FTRACE_WITH_REGS
140	select HAVE_EBPF_JIT
141	select HAVE_EFFICIENT_UNALIGNED_ACCESS if !ARCH_STRICT_ALIGN
142	select HAVE_EXIT_THREAD
143	select HAVE_GUP_FAST
144	select HAVE_FTRACE_GRAPH_FUNC
145	select HAVE_FUNCTION_ARG_ACCESS_API
146	select HAVE_FUNCTION_ERROR_INJECTION
147	select HAVE_FUNCTION_GRAPH_FREGS
148	select HAVE_FUNCTION_GRAPH_TRACER
149	select HAVE_FUNCTION_TRACER
150	select HAVE_GCC_PLUGINS
151	select HAVE_GENERIC_VDSO
152	select HAVE_HW_BREAKPOINT if PERF_EVENTS
153	select HAVE_IOREMAP_PROT
154	select HAVE_IRQ_EXIT_ON_IRQ_STACK
155	select HAVE_IRQ_TIME_ACCOUNTING
156	select HAVE_KPROBES
157	select HAVE_KPROBES_ON_FTRACE
158	select HAVE_KRETPROBES
159	select HAVE_LIVEPATCH
160	select HAVE_MOD_ARCH_SPECIFIC
161	select HAVE_NMI
162	select HAVE_OBJTOOL if AS_HAS_EXPLICIT_RELOCS && AS_HAS_THIN_ADD_SUB
163	select HAVE_PCI
164	select HAVE_PERF_EVENTS
165	select HAVE_PERF_REGS
166	select HAVE_PERF_USER_STACK_DUMP
167	select HAVE_POSIX_CPU_TIMERS_TASK_WORK
168	select HAVE_PREEMPT_DYNAMIC_KEY
169	select HAVE_REGS_AND_STACK_ACCESS_API
170	select HAVE_RELIABLE_STACKTRACE if UNWINDER_ORC
171	select HAVE_RETHOOK
172	select HAVE_RSEQ
173	select HAVE_RUST
174	select HAVE_SAMPLE_FTRACE_DIRECT
175	select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
176	select HAVE_SETUP_PER_CPU_AREA if NUMA
177	select HAVE_STACK_VALIDATION if HAVE_OBJTOOL
178	select HAVE_STACKPROTECTOR
179	select HAVE_SYSCALL_TRACEPOINTS
180	select HAVE_TIF_NOHZ
181	select HAVE_VIRT_CPU_ACCOUNTING_GEN
182	select IRQ_FORCED_THREADING
183	select IRQ_LOONGARCH_CPU
184	select LOCK_MM_AND_FIND_VMA
185	select MMU_GATHER_MERGE_VMAS if MMU
186	select MODULES_USE_ELF_RELA if MODULES
187	select NEED_PER_CPU_EMBED_FIRST_CHUNK
188	select NEED_PER_CPU_PAGE_FIRST_CHUNK
189	select NUMA_MEMBLKS if NUMA
190	select OF
191	select OF_EARLY_FLATTREE
192	select PCI
193	select PCI_DOMAINS_GENERIC
194	select PCI_ECAM if ACPI
195	select PCI_LOONGSON
196	select PCI_MSI_ARCH_FALLBACKS
197	select PCI_QUIRKS
198	select PERF_USE_VMALLOC
199	select RTC_LIB
200	select SPARSE_IRQ
201	select SYSCTL_ARCH_UNALIGN_ALLOW
202	select SYSCTL_ARCH_UNALIGN_NO_WARN
203	select SYSCTL_EXCEPTION_TRACE
204	select SWIOTLB
205	select TRACE_IRQFLAGS_SUPPORT
206	select USE_PERCPU_NUMA_NODE_ID
207	select USER_STACKTRACE_SUPPORT
208	select VDSO_GETRANDOM
209	select ZONE_DMA32
210
211config 32BIT
212	bool
213
214config 64BIT
215	def_bool y
216
217config GENERIC_BUG
218	def_bool y
219	depends on BUG
220
221config GENERIC_BUG_RELATIVE_POINTERS
222	def_bool y
223	depends on GENERIC_BUG
224
225config GENERIC_CALIBRATE_DELAY
226	def_bool y
227
228config GENERIC_CSUM
229	def_bool y
230
231config GENERIC_HWEIGHT
232	def_bool y
233
234config L1_CACHE_SHIFT
235	int
236	default "6"
237
238config LOCKDEP_SUPPORT
239	bool
240	default y
241
242config STACKTRACE_SUPPORT
243	bool
244	default y
245
246# MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the
247# MIPS Loongson code, to preserve Loongson-specific code paths in drivers that
248# are shared between architectures, and specifically expecting the symbols.
249config MACH_LOONGSON32
250	def_bool 32BIT
251
252config MACH_LOONGSON64
253	def_bool 64BIT
254
255config FIX_EARLYCON_MEM
256	def_bool !ARCH_IOREMAP
257
258config PGTABLE_2LEVEL
259	bool
260
261config PGTABLE_3LEVEL
262	bool
263
264config PGTABLE_4LEVEL
265	bool
266
267config PGTABLE_LEVELS
268	int
269	default 2 if PGTABLE_2LEVEL
270	default 3 if PGTABLE_3LEVEL
271	default 4 if PGTABLE_4LEVEL
272
273config SCHED_OMIT_FRAME_POINTER
274	bool
275	default y
276
277config AS_HAS_EXPLICIT_RELOCS
278	def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x))
279
280config AS_HAS_FCSR_CLASS
281	def_bool $(as-instr,movfcsr2gr \$t0$(comma)\$fcsr0)
282
283config AS_HAS_THIN_ADD_SUB
284	def_bool $(cc-option,-Wa$(comma)-mthin-add-sub) || AS_IS_LLVM
285
286config AS_HAS_LSX_EXTENSION
287	def_bool $(as-instr,vld \$vr0$(comma)\$a0$(comma)0)
288
289config AS_HAS_LASX_EXTENSION
290	def_bool $(as-instr,xvld \$xr0$(comma)\$a0$(comma)0)
291
292config AS_HAS_LBT_EXTENSION
293	def_bool $(as-instr,movscr2gr \$a0$(comma)\$scr0)
294
295config AS_HAS_LVZ_EXTENSION
296	def_bool $(as-instr,hvcl 0)
297
298config CC_HAS_ANNOTATE_TABLEJUMP
299	def_bool $(cc-option,-mannotate-tablejump)
300
301config RUSTC_HAS_ANNOTATE_TABLEJUMP
302	depends on RUST
303	def_bool $(rustc-option,-Cllvm-args=--loongarch-annotate-tablejump)
304
305menu "Kernel type and options"
306
307source "kernel/Kconfig.hz"
308
309choice
310	prompt "Page Table Layout"
311	default 16KB_2LEVEL if 32BIT
312	default 16KB_3LEVEL if 64BIT
313	help
314	  Allows choosing the page table layout, which is a combination
315	  of page size and page table levels. The size of virtual memory
316	  address space are determined by the page table layout.
317
318config 4KB_3LEVEL
319	bool "4KB with 3 levels"
320	select HAVE_PAGE_SIZE_4KB
321	select PGTABLE_3LEVEL
322	help
323	  This option selects 4KB page size with 3 level page tables, which
324	  support a maximum of 39 bits of application virtual memory.
325
326config 4KB_4LEVEL
327	bool "4KB with 4 levels"
328	select HAVE_PAGE_SIZE_4KB
329	select PGTABLE_4LEVEL
330	help
331	  This option selects 4KB page size with 4 level page tables, which
332	  support a maximum of 48 bits of application virtual memory.
333
334config 16KB_2LEVEL
335	bool "16KB with 2 levels"
336	select HAVE_PAGE_SIZE_16KB
337	select PGTABLE_2LEVEL
338	help
339	  This option selects 16KB page size with 2 level page tables, which
340	  support a maximum of 36 bits of application virtual memory.
341
342config 16KB_3LEVEL
343	bool "16KB with 3 levels"
344	select HAVE_PAGE_SIZE_16KB
345	select PGTABLE_3LEVEL
346	help
347	  This option selects 16KB page size with 3 level page tables, which
348	  support a maximum of 47 bits of application virtual memory.
349
350config 64KB_2LEVEL
351	bool "64KB with 2 levels"
352	select HAVE_PAGE_SIZE_64KB
353	select PGTABLE_2LEVEL
354	help
355	  This option selects 64KB page size with 2 level page tables, which
356	  support a maximum of 42 bits of application virtual memory.
357
358config 64KB_3LEVEL
359	bool "64KB with 3 levels"
360	select HAVE_PAGE_SIZE_64KB
361	select PGTABLE_3LEVEL
362	help
363	  This option selects 64KB page size with 3 level page tables, which
364	  support a maximum of 55 bits of application virtual memory.
365
366endchoice
367
368config CMDLINE
369	string "Built-in kernel command line"
370	help
371	  For most platforms, the arguments for the kernel's command line
372	  are provided at run-time, during boot. However, there are cases
373	  where either no arguments are being provided or the provided
374	  arguments are insufficient or even invalid.
375
376	  When that occurs, it is possible to define a built-in command
377	  line here and choose how the kernel should use it later on.
378
379choice
380	prompt "Kernel command line type"
381	default CMDLINE_BOOTLOADER
382	help
383	  Choose how the kernel will handle the provided built-in command
384	  line.
385
386config CMDLINE_BOOTLOADER
387	bool "Use bootloader kernel arguments if available"
388	help
389	  Prefer the command-line passed by the boot loader if available.
390	  Use the built-in command line as fallback in case we get nothing
391	  during boot. This is the default behaviour.
392
393config CMDLINE_EXTEND
394	bool "Use built-in to extend bootloader kernel arguments"
395	help
396	  The built-in command line will be appended to the command-
397	  line arguments provided during boot. This is useful in
398	  cases where the provided arguments are insufficient and
399	  you don't want to or cannot modify them.
400
401config CMDLINE_FORCE
402	bool "Always use the built-in kernel command string"
403	help
404	  Always use the built-in command line, even if we get one during
405	  boot. This is useful in case you need to override the provided
406	  command line on systems where you don't have or want control
407	  over it.
408
409endchoice
410
411config BUILTIN_DTB
412	bool "Enable built-in dtb in kernel"
413	depends on OF
414	select GENERIC_BUILTIN_DTB
415	help
416	  Some existing systems do not provide a canonical device tree to
417	  the kernel at boot time. Let's provide a device tree table in the
418	  kernel, keyed by the dts filename, containing the relevant DTBs.
419
420	  Built-in DTBs are generic enough and can be used as references.
421
422config BUILTIN_DTB_NAME
423	string "Source file for built-in dtb"
424	depends on BUILTIN_DTB
425	help
426	  Base name (without suffix, relative to arch/loongarch/boot/dts/)
427	  for the DTS file that will be used to produce the DTB linked into
428	  the kernel.
429
430config DMI
431	bool "Enable DMI scanning"
432	select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
433	default y
434	help
435	  This enables SMBIOS/DMI feature for systems, and scanning of
436	  DMI to identify machine quirks.
437
438config EFI
439	bool "EFI runtime service support"
440	select UCS2_STRING
441	select EFI_RUNTIME_WRAPPERS
442	help
443	  This enables the kernel to use EFI runtime services that are
444	  available (such as the EFI variable services).
445
446config EFI_STUB
447	bool "EFI boot stub support"
448	default y
449	depends on EFI
450	select EFI_GENERIC_STUB
451	help
452	  This kernel feature allows the kernel to be loaded directly by
453	  EFI firmware without the use of a bootloader.
454
455config SCHED_SMT
456	bool "SMT scheduler support"
457	depends on SMP
458	default y
459	help
460	  Improves scheduler's performance when there are multiple
461	  threads in one physical core.
462
463config SCHED_MC
464	bool "Multi-core scheduler support"
465	depends on SMP
466	default y
467	help
468	  Multi-core scheduler support improves the CPU scheduler's decision
469	  making when dealing with multi-core CPU chips at a cost of slightly
470	  increased overhead in some places.
471
472config SMP
473	bool "Multi-Processing support"
474	help
475	  This enables support for systems with more than one CPU. If you have
476	  a system with only one CPU, say N. If you have a system with more
477	  than one CPU, say Y.
478
479	  If you say N here, the kernel will run on uni- and multiprocessor
480	  machines, but will use only one CPU of a multiprocessor machine. If
481	  you say Y here, the kernel will run on many, but not all,
482	  uniprocessor machines. On a uniprocessor machine, the kernel
483	  will run faster if you say N here.
484
485	  See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>.
486
487	  If you don't know what to do here, say N.
488
489config HOTPLUG_CPU
490	bool "Support for hot-pluggable CPUs"
491	depends on SMP
492	select GENERIC_IRQ_MIGRATION
493	help
494	  Say Y here to allow turning CPUs off and on. CPUs can be
495	  controlled through /sys/devices/system/cpu.
496	  (Note: power management support will enable this option
497	    automatically on SMP systems. )
498	  Say N if you want to disable CPU hotplug.
499
500config NR_CPUS
501	int "Maximum number of CPUs (2-2048)"
502	range 2 2048
503	default "2048"
504	depends on SMP
505	help
506	  This allows you to specify the maximum number of CPUs which this
507	  kernel will support.
508
509config NUMA
510	bool "NUMA Support"
511	select SMP
512	help
513	  Say Y to compile the kernel with NUMA (Non-Uniform Memory Access)
514	  support.  This option improves performance on systems with more
515	  than one NUMA node; on single node systems it is generally better
516	  to leave it disabled.
517
518config NODES_SHIFT
519	int
520	default "6"
521	depends on NUMA
522
523config ARCH_FORCE_MAX_ORDER
524	int "Maximum zone order"
525	default "13" if PAGE_SIZE_64KB
526	default "11" if PAGE_SIZE_16KB
527	default "10"
528	help
529	  The kernel memory allocator divides physically contiguous memory
530	  blocks into "zones", where each zone is a power of two number of
531	  pages.  This option selects the largest power of two that the kernel
532	  keeps in the memory allocator.  If you need to allocate very large
533	  blocks of physically contiguous memory, then you may need to
534	  increase this value.
535
536	  The page size is not necessarily 4KB.  Keep this in mind
537	  when choosing a value for this option.
538
539config ARCH_IOREMAP
540	bool "Enable LoongArch DMW-based ioremap()"
541	help
542	  We use generic TLB-based ioremap() by default since it has page
543	  protection support. However, you can enable LoongArch DMW-based
544	  ioremap() for better performance.
545
546config ARCH_WRITECOMBINE
547	bool "Enable WriteCombine (WUC) for ioremap()"
548	help
549	  LoongArch maintains cache coherency in hardware, but when paired
550	  with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which
551	  is similar to WriteCombine) is out of the scope of cache coherency
552	  machanism for PCIe devices (this is a PCIe protocol violation, which
553	  may be fixed in newer chipsets).
554
555	  This means WUC can only used for write-only memory regions now, so
556	  this option is disabled by default, making WUC silently fallback to
557	  SUC for ioremap(). You can enable this option if the kernel is ensured
558	  to run on hardware without this bug.
559
560	  You can override this setting via writecombine=on/off boot parameter.
561
562config ARCH_STRICT_ALIGN
563	bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT
564	default y
565	help
566	  Not all LoongArch cores support h/w unaligned access, we can use
567	  -mstrict-align build parameter to prevent unaligned accesses.
568
569	  CPUs with h/w unaligned access support:
570	  Loongson-2K2000/2K3000 and all of Loongson-3 series processors
571	  based on LoongArch.
572
573	  CPUs without h/w unaligned access support:
574	  Loongson-2K0300/2K0500/2K1000.
575
576	  If you want to make sure whether to support unaligned memory access
577	  on your hardware, please read the bit 20 (UAL) of CPUCFG1 register.
578
579	  This option is enabled by default to make the kernel be able to run
580	  on all LoongArch systems. But you can disable it manually if you want
581	  to run kernel only on systems with h/w unaligned access support in
582	  order to optimise for performance.
583
584config CPU_HAS_FPU
585	bool
586	default y
587
588config CPU_HAS_LSX
589	bool "Support for the Loongson SIMD Extension"
590	depends on AS_HAS_LSX_EXTENSION
591	help
592	  Loongson SIMD Extension (LSX) introduces 128 bit wide vector registers
593	  and a set of SIMD instructions to operate on them. When this option
594	  is enabled the kernel will support allocating & switching LSX
595	  vector register contexts. If you know that your kernel will only be
596	  running on CPUs which do not support LSX or that your userland will
597	  not be making use of it then you may wish to say N here to reduce
598	  the size & complexity of your kernel.
599
600	  If unsure, say Y.
601
602config CPU_HAS_LASX
603	bool "Support for the Loongson Advanced SIMD Extension"
604	depends on CPU_HAS_LSX
605	depends on AS_HAS_LASX_EXTENSION
606	help
607	  Loongson Advanced SIMD Extension (LASX) introduces 256 bit wide vector
608	  registers and a set of SIMD instructions to operate on them. When this
609	  option is enabled the kernel will support allocating & switching LASX
610	  vector register contexts. If you know that your kernel will only be
611	  running on CPUs which do not support LASX or that your userland will
612	  not be making use of it then you may wish to say N here to reduce
613	  the size & complexity of your kernel.
614
615	  If unsure, say Y.
616
617config CPU_HAS_LBT
618	bool "Support for the Loongson Binary Translation Extension"
619	depends on AS_HAS_LBT_EXTENSION
620	help
621	  Loongson Binary Translation (LBT) introduces 4 scratch registers (SCR0
622	  to SCR3), x86/ARM eflags (eflags) and x87 fpu stack pointer (ftop).
623	  Enabling this option allows the kernel to allocate and switch registers
624	  specific to LBT.
625
626	  If you want to use this feature, such as the Loongson Architecture
627	  Translator (LAT), say Y.
628
629config CPU_HAS_PREFETCH
630	bool
631	default y
632
633config ARCH_SUPPORTS_KEXEC
634	def_bool y
635
636config ARCH_SUPPORTS_CRASH_DUMP
637	def_bool y
638
639config ARCH_DEFAULT_CRASH_DUMP
640	def_bool y
641
642config ARCH_SELECTS_CRASH_DUMP
643	def_bool y
644	depends on CRASH_DUMP
645	select RELOCATABLE
646
647config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
648	def_bool CRASH_RESERVE
649
650config RELOCATABLE
651	bool "Relocatable kernel"
652	select ARCH_HAS_RELR
653	help
654	  This builds the kernel as a Position Independent Executable (PIE),
655	  which retains all relocation metadata required, so as to relocate
656	  the kernel binary at runtime to a different virtual address from
657	  its link address.
658
659config RANDOMIZE_BASE
660	bool "Randomize the address of the kernel (KASLR)"
661	depends on RELOCATABLE
662	help
663	   Randomizes the physical and virtual address at which the
664	   kernel image is loaded, as a security feature that
665	   deters exploit attempts relying on knowledge of the location
666	   of kernel internals.
667
668	   The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET.
669
670	   If unsure, say N.
671
672config RANDOMIZE_BASE_MAX_OFFSET
673	hex "Maximum KASLR offset" if EXPERT
674	depends on RANDOMIZE_BASE
675	range 0x0 0x10000000
676	default "0x01000000"
677	help
678	  When KASLR is active, this provides the maximum offset that will
679	  be applied to the kernel image. It should be set according to the
680	  amount of physical RAM available in the target system.
681
682	  This is limited by the size of the lower address memory, 256MB.
683
684source "kernel/livepatch/Kconfig"
685
686config PARAVIRT
687	bool "Enable paravirtualization code"
688	depends on AS_HAS_LVZ_EXTENSION
689	help
690	  This changes the kernel so it can modify itself when it is run
691	  under a hypervisor, potentially improving performance significantly
692	  over full virtualization.  However, when run without a hypervisor
693	  the kernel is theoretically slower and slightly larger.
694
695config PARAVIRT_TIME_ACCOUNTING
696	bool "Paravirtual steal time accounting"
697	depends on PARAVIRT
698	help
699	  Select this option to enable fine granularity task steal time
700	  accounting. Time spent executing other tasks in parallel with
701	  the current vCPU is discounted from the vCPU power. To account for
702	  that, there can be a small performance impact.
703
704	  If in doubt, say N here.
705
706endmenu
707
708config ARCH_SELECT_MEMORY_MODEL
709	def_bool y
710
711config ARCH_FLATMEM_ENABLE
712	def_bool y
713	depends on !NUMA
714
715config ARCH_SPARSEMEM_ENABLE
716	def_bool y
717	select SPARSEMEM_VMEMMAP_ENABLE
718	help
719	  Say Y to support efficient handling of sparse physical memory,
720	  for architectures which are either NUMA (Non-Uniform Memory Access)
721	  or have huge holes in the physical address space for other reasons.
722	  See <file:Documentation/mm/numa.rst> for more.
723
724config ARCH_MEMORY_PROBE
725	def_bool y
726	depends on MEMORY_HOTPLUG
727
728config MMU
729	bool
730	default y
731
732config ARCH_MMAP_RND_BITS_MIN
733	default 12
734
735config ARCH_MMAP_RND_BITS_MAX
736	default 18
737
738config ARCH_SUPPORTS_UPROBES
739	def_bool y
740
741config KASAN_SHADOW_OFFSET
742	hex
743	default 0x0
744	depends on KASAN
745
746menu "Power management options"
747
748config ARCH_SUSPEND_POSSIBLE
749	def_bool y
750
751config ARCH_HIBERNATION_POSSIBLE
752	def_bool y
753
754source "kernel/power/Kconfig"
755source "drivers/acpi/Kconfig"
756source "drivers/cpufreq/Kconfig"
757
758endmenu
759
760source "arch/loongarch/kvm/Kconfig"
761