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Linux/arch/arm64/Kconfig

  1 config ARM64
  2         def_bool y
  3         select ARCH_BINFMT_ELF_RANDOMIZE_PIE
  4         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
  5         select ARCH_HAS_GCOV_PROFILE_ALL
  6         select ARCH_HAS_SG_CHAIN
  7         select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
  8         select ARCH_USE_CMPXCHG_LOCKREF
  9         select ARCH_SUPPORTS_ATOMIC_RMW
 10         select ARCH_WANT_OPTIONAL_GPIOLIB
 11         select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
 12         select ARCH_WANT_FRAME_POINTERS
 13         select ARM_AMBA
 14         select ARM_ARCH_TIMER
 15         select ARM_GIC
 16         select AUDIT_ARCH_COMPAT_GENERIC
 17         select ARM_GIC_V2M if PCI_MSI
 18         select ARM_GIC_V3
 19         select ARM_GIC_V3_ITS if PCI_MSI
 20         select BUILDTIME_EXTABLE_SORT
 21         select CLONE_BACKWARDS
 22         select COMMON_CLK
 23         select CPU_PM if (SUSPEND || CPU_IDLE)
 24         select DCACHE_WORD_ACCESS
 25         select GENERIC_ALLOCATOR
 26         select GENERIC_CLOCKEVENTS
 27         select GENERIC_CLOCKEVENTS_BROADCAST if SMP
 28         select GENERIC_CPU_AUTOPROBE
 29         select GENERIC_EARLY_IOREMAP
 30         select GENERIC_IRQ_PROBE
 31         select GENERIC_IRQ_SHOW
 32         select GENERIC_PCI_IOMAP
 33         select GENERIC_SCHED_CLOCK
 34         select GENERIC_SMP_IDLE_THREAD
 35         select GENERIC_STRNCPY_FROM_USER
 36         select GENERIC_STRNLEN_USER
 37         select GENERIC_TIME_VSYSCALL
 38         select HANDLE_DOMAIN_IRQ
 39         select HARDIRQS_SW_RESEND
 40         select HAVE_ALIGNED_STRUCT_PAGE if SLUB
 41         select HAVE_ARCH_AUDITSYSCALL
 42         select HAVE_ARCH_JUMP_LABEL
 43         select HAVE_ARCH_KGDB
 44         select HAVE_ARCH_SECCOMP_FILTER
 45         select HAVE_ARCH_TRACEHOOK
 46         select HAVE_BPF_JIT
 47         select HAVE_C_RECORDMCOUNT
 48         select HAVE_CC_STACKPROTECTOR
 49         select HAVE_CMPXCHG_DOUBLE
 50         select HAVE_DEBUG_BUGVERBOSE
 51         select HAVE_DEBUG_KMEMLEAK
 52         select HAVE_DMA_API_DEBUG
 53         select HAVE_DMA_ATTRS
 54         select HAVE_DMA_CONTIGUOUS
 55         select HAVE_DYNAMIC_FTRACE
 56         select HAVE_EFFICIENT_UNALIGNED_ACCESS
 57         select HAVE_FTRACE_MCOUNT_RECORD
 58         select HAVE_FUNCTION_TRACER
 59         select HAVE_FUNCTION_GRAPH_TRACER
 60         select HAVE_GENERIC_DMA_COHERENT
 61         select HAVE_HW_BREAKPOINT if PERF_EVENTS
 62         select HAVE_MEMBLOCK
 63         select HAVE_PATA_PLATFORM
 64         select HAVE_PERF_EVENTS
 65         select HAVE_PERF_REGS
 66         select HAVE_PERF_USER_STACK_DUMP
 67         select HAVE_RCU_TABLE_FREE
 68         select HAVE_SYSCALL_TRACEPOINTS
 69         select IRQ_DOMAIN
 70         select MODULES_USE_ELF_RELA
 71         select NO_BOOTMEM
 72         select OF
 73         select OF_EARLY_FLATTREE
 74         select OF_RESERVED_MEM
 75         select PERF_USE_VMALLOC
 76         select POWER_RESET
 77         select POWER_SUPPLY
 78         select RTC_LIB
 79         select SPARSE_IRQ
 80         select SYSCTL_EXCEPTION_TRACE
 81         select HAVE_CONTEXT_TRACKING
 82         help
 83           ARM 64-bit (AArch64) Linux support.
 84 
 85 config 64BIT
 86         def_bool y
 87 
 88 config ARCH_PHYS_ADDR_T_64BIT
 89         def_bool y
 90 
 91 config MMU
 92         def_bool y
 93 
 94 config NO_IOPORT_MAP
 95         def_bool y if !PCI
 96 
 97 config STACKTRACE_SUPPORT
 98         def_bool y
 99 
100 config LOCKDEP_SUPPORT
101         def_bool y
102 
103 config TRACE_IRQFLAGS_SUPPORT
104         def_bool y
105 
106 config RWSEM_XCHGADD_ALGORITHM
107         def_bool y
108 
109 config GENERIC_HWEIGHT
110         def_bool y
111 
112 config GENERIC_CSUM
113         def_bool y
114 
115 config GENERIC_CALIBRATE_DELAY
116         def_bool y
117 
118 config ZONE_DMA
119         def_bool y
120 
121 config HAVE_GENERIC_RCU_GUP
122         def_bool y
123 
124 config ARCH_DMA_ADDR_T_64BIT
125         def_bool y
126 
127 config NEED_DMA_MAP_STATE
128         def_bool y
129 
130 config NEED_SG_DMA_LENGTH
131         def_bool y
132 
133 config SWIOTLB
134         def_bool y
135 
136 config IOMMU_HELPER
137         def_bool SWIOTLB
138 
139 config KERNEL_MODE_NEON
140         def_bool y
141 
142 config FIX_EARLYCON_MEM
143         def_bool y
144 
145 source "init/Kconfig"
146 
147 source "kernel/Kconfig.freezer"
148 
149 menu "Platform selection"
150 
151 config ARCH_SEATTLE
152         bool "AMD Seattle SoC Family"
153         help
154           This enables support for AMD Seattle SOC Family
155 
156 config ARCH_THUNDER
157         bool "Cavium Inc. Thunder SoC Family"
158         help
159           This enables support for Cavium's Thunder Family of SoCs.
160 
161 config ARCH_VEXPRESS
162         bool "ARMv8 software model (Versatile Express)"
163         select ARCH_REQUIRE_GPIOLIB
164         select COMMON_CLK_VERSATILE
165         select POWER_RESET_VEXPRESS
166         select VEXPRESS_CONFIG
167         help
168           This enables support for the ARMv8 software model (Versatile
169           Express).
170 
171 config ARCH_XGENE
172         bool "AppliedMicro X-Gene SOC Family"
173         help
174           This enables support for AppliedMicro X-Gene SOC Family
175 
176 endmenu
177 
178 menu "Bus support"
179 
180 config PCI
181         bool "PCI support"
182         help
183           This feature enables support for PCI bus system. If you say Y
184           here, the kernel will include drivers and infrastructure code
185           to support PCI bus devices.
186 
187 config PCI_DOMAINS
188         def_bool PCI
189 
190 config PCI_DOMAINS_GENERIC
191         def_bool PCI
192 
193 config PCI_SYSCALL
194         def_bool PCI
195 
196 source "drivers/pci/Kconfig"
197 source "drivers/pci/pcie/Kconfig"
198 source "drivers/pci/hotplug/Kconfig"
199 
200 endmenu
201 
202 menu "Kernel Features"
203 
204 menu "ARM errata workarounds via the alternatives framework"
205 
206 config ARM64_ERRATUM_826319
207         bool "Cortex-A53: 826319: System might deadlock if a write cannot complete until read data is accepted"
208         default y
209         help
210           This option adds an alternative code sequence to work around ARM
211           erratum 826319 on Cortex-A53 parts up to r0p2 with an AMBA 4 ACE or
212           AXI master interface and an L2 cache.
213 
214           If a Cortex-A53 uses an AMBA AXI4 ACE interface to other processors
215           and is unable to accept a certain write via this interface, it will
216           not progress on read data presented on the read data channel and the
217           system can deadlock.
218 
219           The workaround promotes data cache clean instructions to
220           data cache clean-and-invalidate.
221           Please note that this does not necessarily enable the workaround,
222           as it depends on the alternative framework, which will only patch
223           the kernel if an affected CPU is detected.
224 
225           If unsure, say Y.
226 
227 config ARM64_ERRATUM_827319
228         bool "Cortex-A53: 827319: Data cache clean instructions might cause overlapping transactions to the interconnect"
229         default y
230         help
231           This option adds an alternative code sequence to work around ARM
232           erratum 827319 on Cortex-A53 parts up to r0p2 with an AMBA 5 CHI
233           master interface and an L2 cache.
234 
235           Under certain conditions this erratum can cause a clean line eviction
236           to occur at the same time as another transaction to the same address
237           on the AMBA 5 CHI interface, which can cause data corruption if the
238           interconnect reorders the two transactions.
239 
240           The workaround promotes data cache clean instructions to
241           data cache clean-and-invalidate.
242           Please note that this does not necessarily enable the workaround,
243           as it depends on the alternative framework, which will only patch
244           the kernel if an affected CPU is detected.
245 
246           If unsure, say Y.
247 
248 config ARM64_ERRATUM_824069
249         bool "Cortex-A53: 824069: Cache line might not be marked as clean after a CleanShared snoop"
250         default y
251         help
252           This option adds an alternative code sequence to work around ARM
253           erratum 824069 on Cortex-A53 parts up to r0p2 when it is connected
254           to a coherent interconnect.
255 
256           If a Cortex-A53 processor is executing a store or prefetch for
257           write instruction at the same time as a processor in another
258           cluster is executing a cache maintenance operation to the same
259           address, then this erratum might cause a clean cache line to be
260           incorrectly marked as dirty.
261 
262           The workaround promotes data cache clean instructions to
263           data cache clean-and-invalidate.
264           Please note that this option does not necessarily enable the
265           workaround, as it depends on the alternative framework, which will
266           only patch the kernel if an affected CPU is detected.
267 
268           If unsure, say Y.
269 
270 config ARM64_ERRATUM_819472
271         bool "Cortex-A53: 819472: Store exclusive instructions might cause data corruption"
272         default y
273         help
274           This option adds an alternative code sequence to work around ARM
275           erratum 819472 on Cortex-A53 parts up to r0p1 with an L2 cache
276           present when it is connected to a coherent interconnect.
277 
278           If the processor is executing a load and store exclusive sequence at
279           the same time as a processor in another cluster is executing a cache
280           maintenance operation to the same address, then this erratum might
281           cause data corruption.
282 
283           The workaround promotes data cache clean instructions to
284           data cache clean-and-invalidate.
285           Please note that this does not necessarily enable the workaround,
286           as it depends on the alternative framework, which will only patch
287           the kernel if an affected CPU is detected.
288 
289           If unsure, say Y.
290 
291 config ARM64_ERRATUM_832075
292         bool "Cortex-A57: 832075: possible deadlock on mixing exclusive memory accesses with device loads"
293         default y
294         help
295           This option adds an alternative code sequence to work around ARM
296           erratum 832075 on Cortex-A57 parts up to r1p2.
297 
298           Affected Cortex-A57 parts might deadlock when exclusive load/store
299           instructions to Write-Back memory are mixed with Device loads.
300 
301           The workaround is to promote device loads to use Load-Acquire
302           semantics.
303           Please note that this does not necessarily enable the workaround,
304           as it depends on the alternative framework, which will only patch
305           the kernel if an affected CPU is detected.
306 
307           If unsure, say Y.
308 
309 endmenu
310 
311 
312 choice
313         prompt "Page size"
314         default ARM64_4K_PAGES
315         help
316           Page size (translation granule) configuration.
317 
318 config ARM64_4K_PAGES
319         bool "4KB"
320         help
321           This feature enables 4KB pages support.
322 
323 config ARM64_64K_PAGES
324         bool "64KB"
325         help
326           This feature enables 64KB pages support (4KB by default)
327           allowing only two levels of page tables and faster TLB
328           look-up. AArch32 emulation is not available when this feature
329           is enabled.
330 
331 endchoice
332 
333 choice
334         prompt "Virtual address space size"
335         default ARM64_VA_BITS_39 if ARM64_4K_PAGES
336         default ARM64_VA_BITS_42 if ARM64_64K_PAGES
337         help
338           Allows choosing one of multiple possible virtual address
339           space sizes. The level of translation table is determined by
340           a combination of page size and virtual address space size.
341 
342 config ARM64_VA_BITS_39
343         bool "39-bit"
344         depends on ARM64_4K_PAGES
345 
346 config ARM64_VA_BITS_42
347         bool "42-bit"
348         depends on ARM64_64K_PAGES
349 
350 config ARM64_VA_BITS_48
351         bool "48-bit"
352         depends on !ARM_SMMU
353 
354 endchoice
355 
356 config ARM64_VA_BITS
357         int
358         default 39 if ARM64_VA_BITS_39
359         default 42 if ARM64_VA_BITS_42
360         default 48 if ARM64_VA_BITS_48
361 
362 config ARM64_PGTABLE_LEVELS
363         int
364         default 2 if ARM64_64K_PAGES && ARM64_VA_BITS_42
365         default 3 if ARM64_64K_PAGES && ARM64_VA_BITS_48
366         default 3 if ARM64_4K_PAGES && ARM64_VA_BITS_39
367         default 4 if ARM64_4K_PAGES && ARM64_VA_BITS_48
368 
369 config CPU_BIG_ENDIAN
370        bool "Build big-endian kernel"
371        help
372          Say Y if you plan on running a kernel in big-endian mode.
373 
374 config SMP
375         bool "Symmetric Multi-Processing"
376         help
377           This enables support for systems with more than one CPU.  If
378           you say N here, the kernel will run on single and
379           multiprocessor machines, but will use only one CPU of a
380           multiprocessor machine. If you say Y here, the kernel will run
381           on many, but not all, single processor machines. On a single
382           processor machine, the kernel will run faster if you say N
383           here.
384 
385           If you don't know what to do here, say N.
386 
387 config SCHED_MC
388         bool "Multi-core scheduler support"
389         depends on SMP
390         help
391           Multi-core scheduler support improves the CPU scheduler's decision
392           making when dealing with multi-core CPU chips at a cost of slightly
393           increased overhead in some places. If unsure say N here.
394 
395 config SCHED_SMT
396         bool "SMT scheduler support"
397         depends on SMP
398         help
399           Improves the CPU scheduler's decision making when dealing with
400           MultiThreading at a cost of slightly increased overhead in some
401           places. If unsure say N here.
402 
403 config NR_CPUS
404         int "Maximum number of CPUs (2-64)"
405         range 2 64
406         depends on SMP
407         # These have to remain sorted largest to smallest
408         default "64"
409 
410 config HOTPLUG_CPU
411         bool "Support for hot-pluggable CPUs"
412         depends on SMP
413         help
414           Say Y here to experiment with turning CPUs off and on.  CPUs
415           can be controlled through /sys/devices/system/cpu.
416 
417 source kernel/Kconfig.preempt
418 
419 config HZ
420         int
421         default 100
422 
423 config ARCH_HAS_HOLES_MEMORYMODEL
424         def_bool y if SPARSEMEM
425 
426 config ARCH_SPARSEMEM_ENABLE
427         def_bool y
428         select SPARSEMEM_VMEMMAP_ENABLE
429 
430 config ARCH_SPARSEMEM_DEFAULT
431         def_bool ARCH_SPARSEMEM_ENABLE
432 
433 config ARCH_SELECT_MEMORY_MODEL
434         def_bool ARCH_SPARSEMEM_ENABLE
435 
436 config HAVE_ARCH_PFN_VALID
437         def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
438 
439 config HW_PERF_EVENTS
440         bool "Enable hardware performance counter support for perf events"
441         depends on PERF_EVENTS
442         default y
443         help
444           Enable hardware performance counter support for perf events. If
445           disabled, perf events will use software events only.
446 
447 config SYS_SUPPORTS_HUGETLBFS
448         def_bool y
449 
450 config ARCH_WANT_GENERAL_HUGETLB
451         def_bool y
452 
453 config ARCH_WANT_HUGE_PMD_SHARE
454         def_bool y if !ARM64_64K_PAGES
455 
456 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
457         def_bool y
458 
459 config ARCH_HAS_CACHE_LINE_SIZE
460         def_bool y
461 
462 source "mm/Kconfig"
463 
464 config SECCOMP
465         bool "Enable seccomp to safely compute untrusted bytecode"
466         ---help---
467           This kernel feature is useful for number crunching applications
468           that may need to compute untrusted bytecode during their
469           execution. By using pipes or other transports made available to
470           the process as file descriptors supporting the read/write
471           syscalls, it's possible to isolate those applications in
472           their own address space using seccomp. Once seccomp is
473           enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
474           and the task is only allowed to execute a few safe syscalls
475           defined by each seccomp mode.
476 
477 config XEN_DOM0
478         def_bool y
479         depends on XEN
480 
481 config XEN
482         bool "Xen guest support on ARM64"
483         depends on ARM64 && OF
484         select SWIOTLB_XEN
485         help
486           Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64.
487 
488 config FORCE_MAX_ZONEORDER
489         int
490         default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
491         default "11"
492 
493 menuconfig ARMV8_DEPRECATED
494         bool "Emulate deprecated/obsolete ARMv8 instructions"
495         depends on COMPAT
496         help
497           Legacy software support may require certain instructions
498           that have been deprecated or obsoleted in the architecture.
499 
500           Enable this config to enable selective emulation of these
501           features.
502 
503           If unsure, say Y
504 
505 if ARMV8_DEPRECATED
506 
507 config SWP_EMULATION
508         bool "Emulate SWP/SWPB instructions"
509         help
510           ARMv8 obsoletes the use of A32 SWP/SWPB instructions such that
511           they are always undefined. Say Y here to enable software
512           emulation of these instructions for userspace using LDXR/STXR.
513 
514           In some older versions of glibc [<=2.8] SWP is used during futex
515           trylock() operations with the assumption that the code will not
516           be preempted. This invalid assumption may be more likely to fail
517           with SWP emulation enabled, leading to deadlock of the user
518           application.
519 
520           NOTE: when accessing uncached shared regions, LDXR/STXR rely
521           on an external transaction monitoring block called a global
522           monitor to maintain update atomicity. If your system does not
523           implement a global monitor, this option can cause programs that
524           perform SWP operations to uncached memory to deadlock.
525 
526           If unsure, say Y
527 
528 config CP15_BARRIER_EMULATION
529         bool "Emulate CP15 Barrier instructions"
530         help
531           The CP15 barrier instructions - CP15ISB, CP15DSB, and
532           CP15DMB - are deprecated in ARMv8 (and ARMv7). It is
533           strongly recommended to use the ISB, DSB, and DMB
534           instructions instead.
535 
536           Say Y here to enable software emulation of these
537           instructions for AArch32 userspace code. When this option is
538           enabled, CP15 barrier usage is traced which can help
539           identify software that needs updating.
540 
541           If unsure, say Y
542 
543 endif
544 
545 endmenu
546 
547 menu "Boot options"
548 
549 config CMDLINE
550         string "Default kernel command string"
551         default ""
552         help
553           Provide a set of default command-line options at build time by
554           entering them here. As a minimum, you should specify the the
555           root device (e.g. root=/dev/nfs).
556 
557 config CMDLINE_FORCE
558         bool "Always use the default kernel command string"
559         help
560           Always use the default kernel command string, even if the boot
561           loader passes other arguments to the kernel.
562           This is useful if you cannot or don't want to change the
563           command-line options your boot loader passes to the kernel.
564 
565 config EFI_STUB
566         bool
567 
568 config EFI
569         bool "UEFI runtime support"
570         depends on OF && !CPU_BIG_ENDIAN
571         select LIBFDT
572         select UCS2_STRING
573         select EFI_PARAMS_FROM_FDT
574         select EFI_RUNTIME_WRAPPERS
575         select EFI_STUB
576         select EFI_ARMSTUB
577         default y
578         help
579           This option provides support for runtime services provided
580           by UEFI firmware (such as non-volatile variables, realtime
581           clock, and platform reset). A UEFI stub is also provided to
582           allow the kernel to be booted as an EFI application. This
583           is only useful on systems that have UEFI firmware.
584 
585 config DMI
586         bool "Enable support for SMBIOS (DMI) tables"
587         depends on EFI
588         default y
589         help
590           This enables SMBIOS/DMI feature for systems.
591 
592           This option is only useful on systems that have UEFI firmware.
593           However, even with this option, the resultant kernel should
594           continue to boot on existing non-UEFI platforms.
595 
596 endmenu
597 
598 menu "Userspace binary formats"
599 
600 source "fs/Kconfig.binfmt"
601 
602 config COMPAT
603         bool "Kernel support for 32-bit EL0"
604         depends on !ARM64_64K_PAGES
605         select COMPAT_BINFMT_ELF
606         select HAVE_UID16
607         select OLD_SIGSUSPEND3
608         select COMPAT_OLD_SIGACTION
609         help
610           This option enables support for a 32-bit EL0 running under a 64-bit
611           kernel at EL1. AArch32-specific components such as system calls,
612           the user helper functions, VFP support and the ptrace interface are
613           handled appropriately by the kernel.
614 
615           If you want to execute 32-bit userspace applications, say Y.
616 
617 config SYSVIPC_COMPAT
618         def_bool y
619         depends on COMPAT && SYSVIPC
620 
621 endmenu
622 
623 menu "Power management options"
624 
625 source "kernel/power/Kconfig"
626 
627 config ARCH_SUSPEND_POSSIBLE
628         def_bool y
629 
630 config ARM64_CPU_SUSPEND
631         def_bool PM_SLEEP
632 
633 endmenu
634 
635 menu "CPU Power Management"
636 
637 source "drivers/cpuidle/Kconfig"
638 
639 source "drivers/cpufreq/Kconfig"
640 
641 endmenu
642 
643 source "net/Kconfig"
644 
645 source "drivers/Kconfig"
646 
647 source "drivers/firmware/Kconfig"
648 
649 source "fs/Kconfig"
650 
651 source "arch/arm64/kvm/Kconfig"
652 
653 source "arch/arm64/Kconfig.debug"
654 
655 source "security/Kconfig"
656 
657 source "crypto/Kconfig"
658 if CRYPTO
659 source "arch/arm64/crypto/Kconfig"
660 endif
661 
662 source "lib/Kconfig"

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