xref: /openbmc/linux/arch/loongarch/Kconfig (revision 63186a89)
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_PPTT if ACPI
9	select ACPI_SYSTEM_POWER_STATES_SUPPORT	if ACPI
10	select ARCH_BINFMT_ELF_STATE
11	select ARCH_ENABLE_MEMORY_HOTPLUG
12	select ARCH_ENABLE_MEMORY_HOTREMOVE
13	select ARCH_HAS_ACPI_TABLE_UPGRADE	if ACPI
14	select ARCH_HAS_CPU_FINALIZE_INIT
15	select ARCH_HAS_FORTIFY_SOURCE
16	select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
17	select ARCH_HAS_PTE_SPECIAL
18	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
19	select ARCH_INLINE_READ_LOCK if !PREEMPTION
20	select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION
21	select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION
22	select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION
23	select ARCH_INLINE_READ_UNLOCK if !PREEMPTION
24	select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION
25	select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION
26	select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION
27	select ARCH_INLINE_WRITE_LOCK if !PREEMPTION
28	select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION
29	select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION
30	select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION
31	select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION
32	select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION
33	select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION
34	select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION
35	select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION
36	select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION
37	select ARCH_INLINE_SPIN_LOCK if !PREEMPTION
38	select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION
39	select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION
40	select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION
41	select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION
42	select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION
43	select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION
44	select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION
45	select ARCH_KEEP_MEMBLOCK
46	select ARCH_MIGHT_HAVE_PC_PARPORT
47	select ARCH_MIGHT_HAVE_PC_SERIO
48	select ARCH_SPARSEMEM_ENABLE
49	select ARCH_STACKWALK
50	select ARCH_SUPPORTS_ACPI
51	select ARCH_SUPPORTS_ATOMIC_RMW
52	select ARCH_SUPPORTS_HUGETLBFS
53	select ARCH_SUPPORTS_LTO_CLANG
54	select ARCH_SUPPORTS_LTO_CLANG_THIN
55	select ARCH_SUPPORTS_NUMA_BALANCING
56	select ARCH_USE_BUILTIN_BSWAP
57	select ARCH_USE_CMPXCHG_LOCKREF
58	select ARCH_USE_QUEUED_RWLOCKS
59	select ARCH_USE_QUEUED_SPINLOCKS
60	select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
61	select ARCH_WANT_LD_ORPHAN_WARN
62	select ARCH_WANT_OPTIMIZE_VMEMMAP
63	select ARCH_WANTS_NO_INSTR
64	select BUILDTIME_TABLE_SORT
65	select COMMON_CLK
66	select CPU_PM
67	select EFI
68	select GENERIC_CLOCKEVENTS
69	select GENERIC_CMOS_UPDATE
70	select GENERIC_CPU_AUTOPROBE
71	select GENERIC_ENTRY
72	select GENERIC_GETTIMEOFDAY
73	select GENERIC_IOREMAP if !ARCH_IOREMAP
74	select GENERIC_IRQ_MULTI_HANDLER
75	select GENERIC_IRQ_PROBE
76	select GENERIC_IRQ_SHOW
77	select GENERIC_LIB_ASHLDI3
78	select GENERIC_LIB_ASHRDI3
79	select GENERIC_LIB_CMPDI2
80	select GENERIC_LIB_LSHRDI3
81	select GENERIC_LIB_UCMPDI2
82	select GENERIC_LIB_DEVMEM_IS_ALLOWED
83	select GENERIC_PCI_IOMAP
84	select GENERIC_SCHED_CLOCK
85	select GENERIC_SMP_IDLE_THREAD
86	select GENERIC_TIME_VSYSCALL
87	select GENERIC_VDSO_TIME_NS
88	select GPIOLIB
89	select HAS_IOPORT
90	select HAVE_ARCH_AUDITSYSCALL
91	select HAVE_ARCH_JUMP_LABEL
92	select HAVE_ARCH_JUMP_LABEL_RELATIVE
93	select HAVE_ARCH_MMAP_RND_BITS if MMU
94	select HAVE_ARCH_SECCOMP_FILTER
95	select HAVE_ARCH_TRACEHOOK
96	select HAVE_ARCH_TRANSPARENT_HUGEPAGE
97	select HAVE_ASM_MODVERSIONS
98	select HAVE_CONTEXT_TRACKING_USER
99	select HAVE_C_RECORDMCOUNT
100	select HAVE_DEBUG_KMEMLEAK
101	select HAVE_DEBUG_STACKOVERFLOW
102	select HAVE_DMA_CONTIGUOUS
103	select HAVE_DYNAMIC_FTRACE
104	select HAVE_DYNAMIC_FTRACE_WITH_ARGS
105	select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
106	select HAVE_DYNAMIC_FTRACE_WITH_REGS
107	select HAVE_EBPF_JIT
108	select HAVE_EFFICIENT_UNALIGNED_ACCESS if !ARCH_STRICT_ALIGN
109	select HAVE_EXIT_THREAD
110	select HAVE_FAST_GUP
111	select HAVE_FTRACE_MCOUNT_RECORD
112	select HAVE_FUNCTION_ARG_ACCESS_API
113	select HAVE_FUNCTION_ERROR_INJECTION
114	select HAVE_FUNCTION_GRAPH_RETVAL if HAVE_FUNCTION_GRAPH_TRACER
115	select HAVE_FUNCTION_GRAPH_TRACER
116	select HAVE_FUNCTION_TRACER
117	select HAVE_GENERIC_VDSO
118	select HAVE_HW_BREAKPOINT if PERF_EVENTS
119	select HAVE_IOREMAP_PROT
120	select HAVE_IRQ_EXIT_ON_IRQ_STACK
121	select HAVE_IRQ_TIME_ACCOUNTING
122	select HAVE_KPROBES
123	select HAVE_KPROBES_ON_FTRACE
124	select HAVE_KRETPROBES
125	select HAVE_MOD_ARCH_SPECIFIC
126	select HAVE_NMI
127	select HAVE_PCI
128	select HAVE_PERF_EVENTS
129	select HAVE_PERF_REGS
130	select HAVE_PERF_USER_STACK_DUMP
131	select HAVE_REGS_AND_STACK_ACCESS_API
132	select HAVE_RETHOOK
133	select HAVE_RSEQ
134	select HAVE_SAMPLE_FTRACE_DIRECT
135	select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
136	select HAVE_SETUP_PER_CPU_AREA if NUMA
137	select HAVE_STACKPROTECTOR
138	select HAVE_SYSCALL_TRACEPOINTS
139	select HAVE_TIF_NOHZ
140	select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP
141	select IRQ_FORCED_THREADING
142	select IRQ_LOONGARCH_CPU
143	select LOCK_MM_AND_FIND_VMA
144	select MMU_GATHER_MERGE_VMAS if MMU
145	select MODULES_USE_ELF_RELA if MODULES
146	select NEED_PER_CPU_EMBED_FIRST_CHUNK
147	select NEED_PER_CPU_PAGE_FIRST_CHUNK
148	select OF
149	select OF_EARLY_FLATTREE
150	select PCI
151	select PCI_DOMAINS_GENERIC
152	select PCI_ECAM if ACPI
153	select PCI_LOONGSON
154	select PCI_MSI_ARCH_FALLBACKS
155	select PCI_QUIRKS
156	select PERF_USE_VMALLOC
157	select RTC_LIB
158	select SMP
159	select SPARSE_IRQ
160	select SYSCTL_ARCH_UNALIGN_ALLOW
161	select SYSCTL_ARCH_UNALIGN_NO_WARN
162	select SYSCTL_EXCEPTION_TRACE
163	select SWIOTLB
164	select TRACE_IRQFLAGS_SUPPORT
165	select USE_PERCPU_NUMA_NODE_ID
166	select USER_STACKTRACE_SUPPORT
167	select ZONE_DMA32
168
169config 32BIT
170	bool
171
172config 64BIT
173	def_bool y
174
175config GENERIC_BUG
176	def_bool y
177	depends on BUG
178
179config GENERIC_BUG_RELATIVE_POINTERS
180	def_bool y
181	depends on GENERIC_BUG
182
183config GENERIC_CALIBRATE_DELAY
184	def_bool y
185
186config GENERIC_CSUM
187	def_bool y
188
189config GENERIC_HWEIGHT
190	def_bool y
191
192config L1_CACHE_SHIFT
193	int
194	default "6"
195
196config LOCKDEP_SUPPORT
197	bool
198	default y
199
200config STACKTRACE_SUPPORT
201	bool
202	default y
203
204# MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the
205# MIPS Loongson code, to preserve Loongson-specific code paths in drivers that
206# are shared between architectures, and specifically expecting the symbols.
207config MACH_LOONGSON32
208	def_bool 32BIT
209
210config MACH_LOONGSON64
211	def_bool 64BIT
212
213config FIX_EARLYCON_MEM
214	def_bool y
215
216config PAGE_SIZE_4KB
217	bool
218
219config PAGE_SIZE_16KB
220	bool
221
222config PAGE_SIZE_64KB
223	bool
224
225config PGTABLE_2LEVEL
226	bool
227
228config PGTABLE_3LEVEL
229	bool
230
231config PGTABLE_4LEVEL
232	bool
233
234config PGTABLE_LEVELS
235	int
236	default 2 if PGTABLE_2LEVEL
237	default 3 if PGTABLE_3LEVEL
238	default 4 if PGTABLE_4LEVEL
239
240config SCHED_OMIT_FRAME_POINTER
241	bool
242	default y
243
244config AS_HAS_EXPLICIT_RELOCS
245	def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x))
246
247config AS_HAS_FCSR_CLASS
248	def_bool $(as-instr,movfcsr2gr \$t0$(comma)\$fcsr0)
249
250config AS_HAS_LSX_EXTENSION
251	def_bool $(as-instr,vld \$vr0$(comma)\$a0$(comma)0)
252
253config AS_HAS_LASX_EXTENSION
254	def_bool $(as-instr,xvld \$xr0$(comma)\$a0$(comma)0)
255
256menu "Kernel type and options"
257
258source "kernel/Kconfig.hz"
259
260choice
261	prompt "Page Table Layout"
262	default 16KB_2LEVEL if 32BIT
263	default 16KB_3LEVEL if 64BIT
264	help
265	  Allows choosing the page table layout, which is a combination
266	  of page size and page table levels. The size of virtual memory
267	  address space are determined by the page table layout.
268
269config 4KB_3LEVEL
270	bool "4KB with 3 levels"
271	select PAGE_SIZE_4KB
272	select PGTABLE_3LEVEL
273	help
274	  This option selects 4KB page size with 3 level page tables, which
275	  support a maximum of 39 bits of application virtual memory.
276
277config 4KB_4LEVEL
278	bool "4KB with 4 levels"
279	select PAGE_SIZE_4KB
280	select PGTABLE_4LEVEL
281	help
282	  This option selects 4KB page size with 4 level page tables, which
283	  support a maximum of 48 bits of application virtual memory.
284
285config 16KB_2LEVEL
286	bool "16KB with 2 levels"
287	select PAGE_SIZE_16KB
288	select PGTABLE_2LEVEL
289	help
290	  This option selects 16KB page size with 2 level page tables, which
291	  support a maximum of 36 bits of application virtual memory.
292
293config 16KB_3LEVEL
294	bool "16KB with 3 levels"
295	select PAGE_SIZE_16KB
296	select PGTABLE_3LEVEL
297	help
298	  This option selects 16KB page size with 3 level page tables, which
299	  support a maximum of 47 bits of application virtual memory.
300
301config 64KB_2LEVEL
302	bool "64KB with 2 levels"
303	select PAGE_SIZE_64KB
304	select PGTABLE_2LEVEL
305	help
306	  This option selects 64KB page size with 2 level page tables, which
307	  support a maximum of 42 bits of application virtual memory.
308
309config 64KB_3LEVEL
310	bool "64KB with 3 levels"
311	select PAGE_SIZE_64KB
312	select PGTABLE_3LEVEL
313	help
314	  This option selects 64KB page size with 3 level page tables, which
315	  support a maximum of 55 bits of application virtual memory.
316
317endchoice
318
319config CMDLINE
320	string "Built-in kernel command line"
321	help
322	  For most platforms, the arguments for the kernel's command line
323	  are provided at run-time, during boot. However, there are cases
324	  where either no arguments are being provided or the provided
325	  arguments are insufficient or even invalid.
326
327	  When that occurs, it is possible to define a built-in command
328	  line here and choose how the kernel should use it later on.
329
330choice
331	prompt "Kernel command line type"
332	default CMDLINE_BOOTLOADER
333	help
334	  Choose how the kernel will handle the provided built-in command
335	  line.
336
337config CMDLINE_BOOTLOADER
338	bool "Use bootloader kernel arguments if available"
339	help
340	  Prefer the command-line passed by the boot loader if available.
341	  Use the built-in command line as fallback in case we get nothing
342	  during boot. This is the default behaviour.
343
344config CMDLINE_EXTEND
345	bool "Use built-in to extend bootloader kernel arguments"
346	help
347	  The command-line arguments provided during boot will be
348	  appended to the built-in command line. This is useful in
349	  cases where the provided arguments are insufficient and
350	  you don't want to or cannot modify them.
351
352config CMDLINE_FORCE
353	bool "Always use the built-in kernel command string"
354	help
355	  Always use the built-in command line, even if we get one during
356	  boot. This is useful in case you need to override the provided
357	  command line on systems where you don't have or want control
358	  over it.
359
360endchoice
361
362config DMI
363	bool "Enable DMI scanning"
364	select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
365	default y
366	help
367	  This enables SMBIOS/DMI feature for systems, and scanning of
368	  DMI to identify machine quirks.
369
370config EFI
371	bool "EFI runtime service support"
372	select UCS2_STRING
373	select EFI_RUNTIME_WRAPPERS
374	help
375	  This enables the kernel to use EFI runtime services that are
376	  available (such as the EFI variable services).
377
378config EFI_STUB
379	bool "EFI boot stub support"
380	default y
381	depends on EFI
382	select EFI_GENERIC_STUB
383	help
384	  This kernel feature allows the kernel to be loaded directly by
385	  EFI firmware without the use of a bootloader.
386
387config SCHED_SMT
388	bool "SMT scheduler support"
389	default y
390	help
391	  Improves scheduler's performance when there are multiple
392	  threads in one physical core.
393
394config SMP
395	bool "Multi-Processing support"
396	help
397	  This enables support for systems with more than one CPU. If you have
398	  a system with only one CPU, say N. If you have a system with more
399	  than one CPU, say Y.
400
401	  If you say N here, the kernel will run on uni- and multiprocessor
402	  machines, but will use only one CPU of a multiprocessor machine. If
403	  you say Y here, the kernel will run on many, but not all,
404	  uniprocessor machines. On a uniprocessor machine, the kernel
405	  will run faster if you say N here.
406
407	  See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>.
408
409	  If you don't know what to do here, say N.
410
411config HOTPLUG_CPU
412	bool "Support for hot-pluggable CPUs"
413	depends on SMP
414	select GENERIC_IRQ_MIGRATION
415	help
416	  Say Y here to allow turning CPUs off and on. CPUs can be
417	  controlled through /sys/devices/system/cpu.
418	  (Note: power management support will enable this option
419	    automatically on SMP systems. )
420	  Say N if you want to disable CPU hotplug.
421
422config NR_CPUS
423	int "Maximum number of CPUs (2-256)"
424	range 2 256
425	depends on SMP
426	default "64"
427	help
428	  This allows you to specify the maximum number of CPUs which this
429	  kernel will support.
430
431config NUMA
432	bool "NUMA Support"
433	select SMP
434	select ACPI_NUMA if ACPI
435	help
436	  Say Y to compile the kernel with NUMA (Non-Uniform Memory Access)
437	  support.  This option improves performance on systems with more
438	  than one NUMA node; on single node systems it is generally better
439	  to leave it disabled.
440
441config NODES_SHIFT
442	int
443	default "6"
444	depends on NUMA
445
446config ARCH_FORCE_MAX_ORDER
447	int "Maximum zone order"
448	default "13" if PAGE_SIZE_64KB
449	default "11" if PAGE_SIZE_16KB
450	default "10"
451	help
452	  The kernel memory allocator divides physically contiguous memory
453	  blocks into "zones", where each zone is a power of two number of
454	  pages.  This option selects the largest power of two that the kernel
455	  keeps in the memory allocator.  If you need to allocate very large
456	  blocks of physically contiguous memory, then you may need to
457	  increase this value.
458
459	  The page size is not necessarily 4KB.  Keep this in mind
460	  when choosing a value for this option.
461
462config ARCH_IOREMAP
463	bool "Enable LoongArch DMW-based ioremap()"
464	help
465	  We use generic TLB-based ioremap() by default since it has page
466	  protection support. However, you can enable LoongArch DMW-based
467	  ioremap() for better performance.
468
469config ARCH_WRITECOMBINE
470	bool "Enable WriteCombine (WUC) for ioremap()"
471	help
472	  LoongArch maintains cache coherency in hardware, but when paired
473	  with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which
474	  is similar to WriteCombine) is out of the scope of cache coherency
475	  machanism for PCIe devices (this is a PCIe protocol violation, which
476	  may be fixed in newer chipsets).
477
478	  This means WUC can only used for write-only memory regions now, so
479	  this option is disabled by default, making WUC silently fallback to
480	  SUC for ioremap(). You can enable this option if the kernel is ensured
481	  to run on hardware without this bug.
482
483	  You can override this setting via writecombine=on/off boot parameter.
484
485config ARCH_STRICT_ALIGN
486	bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT
487	default y
488	help
489	  Not all LoongArch cores support h/w unaligned access, we can use
490	  -mstrict-align build parameter to prevent unaligned accesses.
491
492	  CPUs with h/w unaligned access support:
493	  Loongson-2K2000/2K3000/3A5000/3C5000/3D5000.
494
495	  CPUs without h/w unaligned access support:
496	  Loongson-2K500/2K1000.
497
498	  This option is enabled by default to make the kernel be able to run
499	  on all LoongArch systems. But you can disable it manually if you want
500	  to run kernel only on systems with h/w unaligned access support in
501	  order to optimise for performance.
502
503config CPU_HAS_FPU
504	bool
505	default y
506
507config CPU_HAS_LSX
508	bool "Support for the Loongson SIMD Extension"
509	depends on AS_HAS_LSX_EXTENSION
510	help
511	  Loongson SIMD Extension (LSX) introduces 128 bit wide vector registers
512	  and a set of SIMD instructions to operate on them. When this option
513	  is enabled the kernel will support allocating & switching LSX
514	  vector register contexts. If you know that your kernel will only be
515	  running on CPUs which do not support LSX or that your userland will
516	  not be making use of it then you may wish to say N here to reduce
517	  the size & complexity of your kernel.
518
519	  If unsure, say Y.
520
521config CPU_HAS_LASX
522	bool "Support for the Loongson Advanced SIMD Extension"
523	depends on CPU_HAS_LSX
524	depends on AS_HAS_LASX_EXTENSION
525	help
526	  Loongson Advanced SIMD Extension (LASX) introduces 256 bit wide vector
527	  registers and a set of SIMD instructions to operate on them. When this
528	  option is enabled the kernel will support allocating & switching LASX
529	  vector register contexts. If you know that your kernel will only be
530	  running on CPUs which do not support LASX or that your userland will
531	  not be making use of it then you may wish to say N here to reduce
532	  the size & complexity of your kernel.
533
534	  If unsure, say Y.
535
536config CPU_HAS_PREFETCH
537	bool
538	default y
539
540config KEXEC
541	bool "Kexec system call"
542	select KEXEC_CORE
543	help
544	  kexec is a system call that implements the ability to shutdown your
545	  current kernel, and to start another kernel.  It is like a reboot
546	  but it is independent of the system firmware.   And like a reboot
547	  you can start any kernel with it, not just Linux.
548
549	  The name comes from the similarity to the exec system call.
550
551config CRASH_DUMP
552	bool "Build kdump crash kernel"
553	select RELOCATABLE
554	help
555	  Generate crash dump after being started by kexec. This should
556	  be normally only set in special crash dump kernels which are
557	  loaded in the main kernel with kexec-tools into a specially
558	  reserved region and then later executed after a crash by
559	  kdump/kexec.
560
561	  For more details see Documentation/admin-guide/kdump/kdump.rst
562
563config RELOCATABLE
564	bool "Relocatable kernel"
565	help
566	  This builds the kernel as a Position Independent Executable (PIE),
567	  which retains all relocation metadata required, so as to relocate
568	  the kernel binary at runtime to a different virtual address from
569	  its link address.
570
571config RANDOMIZE_BASE
572	bool "Randomize the address of the kernel (KASLR)"
573	depends on RELOCATABLE
574	help
575	   Randomizes the physical and virtual address at which the
576	   kernel image is loaded, as a security feature that
577	   deters exploit attempts relying on knowledge of the location
578	   of kernel internals.
579
580	   The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET.
581
582	   If unsure, say N.
583
584config RANDOMIZE_BASE_MAX_OFFSET
585	hex "Maximum KASLR offset" if EXPERT
586	depends on RANDOMIZE_BASE
587	range 0x0 0x10000000
588	default "0x01000000"
589	help
590	  When KASLR is active, this provides the maximum offset that will
591	  be applied to the kernel image. It should be set according to the
592	  amount of physical RAM available in the target system.
593
594	  This is limited by the size of the lower address memory, 256MB.
595
596config SECCOMP
597	bool "Enable seccomp to safely compute untrusted bytecode"
598	depends on PROC_FS
599	default y
600	help
601	  This kernel feature is useful for number crunching applications
602	  that may need to compute untrusted bytecode during their
603	  execution. By using pipes or other transports made available to
604	  the process as file descriptors supporting the read/write
605	  syscalls, it's possible to isolate those applications in
606	  their own address space using seccomp. Once seccomp is
607	  enabled via /proc/<pid>/seccomp, it cannot be disabled
608	  and the task is only allowed to execute a few safe syscalls
609	  defined by each seccomp mode.
610
611	  If unsure, say Y. Only embedded should say N here.
612
613endmenu
614
615config ARCH_SELECT_MEMORY_MODEL
616	def_bool y
617
618config ARCH_FLATMEM_ENABLE
619	def_bool y
620	depends on !NUMA
621
622config ARCH_SPARSEMEM_ENABLE
623	def_bool y
624	select SPARSEMEM_VMEMMAP_ENABLE
625	help
626	  Say Y to support efficient handling of sparse physical memory,
627	  for architectures which are either NUMA (Non-Uniform Memory Access)
628	  or have huge holes in the physical address space for other reasons.
629	  See <file:Documentation/mm/numa.rst> for more.
630
631config ARCH_ENABLE_THP_MIGRATION
632	def_bool y
633	depends on TRANSPARENT_HUGEPAGE
634
635config ARCH_MEMORY_PROBE
636	def_bool y
637	depends on MEMORY_HOTPLUG
638
639config MMU
640	bool
641	default y
642
643config ARCH_MMAP_RND_BITS_MIN
644	default 12
645
646config ARCH_MMAP_RND_BITS_MAX
647	default 18
648
649config ARCH_SUPPORTS_UPROBES
650	def_bool y
651
652menu "Power management options"
653
654config ARCH_SUSPEND_POSSIBLE
655	def_bool y
656
657config ARCH_HIBERNATION_POSSIBLE
658	def_bool y
659
660source "kernel/power/Kconfig"
661source "drivers/acpi/Kconfig"
662
663endmenu
664
665source "drivers/firmware/Kconfig"
666