arch/arm64/Kconfig

   1 config ARM64
   2         def_bool y
   3         select ACPI_REDUCED_HARDWARE_ONLY if ACPI
   4         select ARCH_BINFMT_ELF_RANDOMIZE_PIE
   5         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
   6         select ARCH_HAS_GCOV_PROFILE_ALL
   7         select ARCH_HAS_SG_CHAIN
   8         select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
   9         select ARCH_USE_CMPXCHG_LOCKREF
  10         select ARCH_SUPPORTS_ATOMIC_RMW
  11         select ARCH_WANT_OPTIONAL_GPIOLIB
  12         select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
  13         select ARCH_WANT_FRAME_POINTERS
  14         select ARM_AMBA
  15         select ARM_ARCH_TIMER
  16         select ARM_GIC
  17         select AUDIT_ARCH_COMPAT_GENERIC
  18         select ARM_GIC_V2M if PCI_MSI
  19         select ARM_GIC_V3
  20         select ARM_GIC_V3_ITS if PCI_MSI
  21         select BUILDTIME_EXTABLE_SORT
  22         select CLONE_BACKWARDS
  23         select COMMON_CLK
  24         select CPU_PM if (SUSPEND || CPU_IDLE)
  25         select DCACHE_WORD_ACCESS
  26         select GENERIC_ALLOCATOR
  27         select GENERIC_CLOCKEVENTS
  28         select GENERIC_CLOCKEVENTS_BROADCAST if SMP
  29         select GENERIC_CPU_AUTOPROBE
  30         select GENERIC_EARLY_IOREMAP
  31         select GENERIC_IRQ_PROBE
  32         select GENERIC_IRQ_SHOW
  33         select GENERIC_PCI_IOMAP
  34         select GENERIC_SCHED_CLOCK
  35         select GENERIC_SMP_IDLE_THREAD
  36         select GENERIC_STRNCPY_FROM_USER
  37         select GENERIC_STRNLEN_USER
  38         select GENERIC_TIME_VSYSCALL
  39         select HANDLE_DOMAIN_IRQ
  40         select HARDIRQS_SW_RESEND
  41         select HAVE_ALIGNED_STRUCT_PAGE if SLUB
  42         select HAVE_ARCH_AUDITSYSCALL
  43         select HAVE_ARCH_BITREVERSE
  44         select HAVE_ARCH_JUMP_LABEL
  45         select HAVE_ARCH_KGDB
  46         select HAVE_ARCH_SECCOMP_FILTER
  47         select HAVE_ARCH_TRACEHOOK
  48         select HAVE_BPF_JIT
  49         select HAVE_C_RECORDMCOUNT
  50         select HAVE_CC_STACKPROTECTOR
  51         select HAVE_CMPXCHG_DOUBLE
  52         select HAVE_DEBUG_BUGVERBOSE
  53         select HAVE_DEBUG_KMEMLEAK
  54         select HAVE_DMA_API_DEBUG
  55         select HAVE_DMA_ATTRS
  56         select HAVE_DMA_CONTIGUOUS
  57         select HAVE_DYNAMIC_FTRACE
  58         select HAVE_EFFICIENT_UNALIGNED_ACCESS
  59         select HAVE_FTRACE_MCOUNT_RECORD
  60         select HAVE_FUNCTION_TRACER
  61         select HAVE_FUNCTION_GRAPH_TRACER
  62         select HAVE_GENERIC_DMA_COHERENT
  63         select HAVE_HW_BREAKPOINT if PERF_EVENTS
  64         select HAVE_MEMBLOCK
  65         select HAVE_PATA_PLATFORM
  66         select HAVE_PERF_EVENTS
  67         select HAVE_PERF_REGS
  68         select HAVE_PERF_USER_STACK_DUMP
  69         select HAVE_RCU_TABLE_FREE
  70         select HAVE_SYSCALL_TRACEPOINTS
  71         select IRQ_DOMAIN
  72         select MODULES_USE_ELF_RELA
  73         select NO_BOOTMEM
  74         select OF
  75         select OF_EARLY_FLATTREE
  76         select OF_RESERVED_MEM
  77         select PERF_USE_VMALLOC
  78         select POWER_RESET
  79         select POWER_SUPPLY
  80         select RTC_LIB
  81         select SPARSE_IRQ
  82         select SYSCTL_EXCEPTION_TRACE
  83         select HAVE_CONTEXT_TRACKING
  84         help
  85           ARM 64-bit (AArch64) Linux support.
  86
  87 config 64BIT
  88         def_bool y
  89
  90 config ARCH_PHYS_ADDR_T_64BIT
  91         def_bool y
  92
  93 config MMU
  94         def_bool y
  95
  96 config NO_IOPORT_MAP
  97         def_bool y if !PCI
  98
  99 config STACKTRACE_SUPPORT
 100         def_bool y
 101
 102 config LOCKDEP_SUPPORT
 103         def_bool y
 104
 105 config TRACE_IRQFLAGS_SUPPORT
 106         def_bool y
 107
 108 config RWSEM_XCHGADD_ALGORITHM
 109         def_bool y
 110
 111 config GENERIC_HWEIGHT
 112         def_bool y
 113
 114 config GENERIC_CSUM
 115         def_bool y
 116
 117 config GENERIC_CALIBRATE_DELAY
 118         def_bool y
 119
 120 config ZONE_DMA
 121         def_bool y
 122
 123 config HAVE_GENERIC_RCU_GUP
 124         def_bool y
 125
 126 config ARCH_DMA_ADDR_T_64BIT
 127         def_bool y
 128
 129 config NEED_DMA_MAP_STATE
 130         def_bool y
 131
 132 config NEED_SG_DMA_LENGTH
 133         def_bool y
 134
 135 config SWIOTLB
 136         def_bool y
 137
 138 config IOMMU_HELPER
 139         def_bool SWIOTLB
 140
 141 config KERNEL_MODE_NEON
 142         def_bool y
 143
 144 config FIX_EARLYCON_MEM
 145         def_bool y
 146
 147 source "init/Kconfig"
 148
 149 source "kernel/Kconfig.freezer"
 150
 151 menu "Platform selection"
 152
 153 config ARCH_EXYNOS
 154         bool
 155         help
 156           This enables support for Samsung Exynos SoC family
 157
 158 config ARCH_EXYNOS7
 159         bool "ARMv8 based Samsung Exynos7"
 160         select ARCH_EXYNOS
 161         select COMMON_CLK_SAMSUNG
 162         select HAVE_S3C2410_WATCHDOG if WATCHDOG
 163         select HAVE_S3C_RTC if RTC_CLASS
 164         select PINCTRL
 165         select PINCTRL_EXYNOS
 166
 167         help
 168           This enables support for Samsung Exynos7 SoC family
 169
 170 config ARCH_FSL_LS2085A
 171         bool "Freescale LS2085A SOC"
 172         help
 173           This enables support for Freescale LS2085A SOC.
 174
 175 config ARCH_MEDIATEK
 176         bool "Mediatek MT65xx & MT81xx ARMv8 SoC"
 177         select ARM_GIC
 178         help
 179           Support for Mediatek MT65xx & MT81xx ARMv8 SoCs
 180
 181 config ARCH_SEATTLE
 182         bool "AMD Seattle SoC Family"
 183         help
 184           This enables support for AMD Seattle SOC Family
 185
 186 config ARCH_TEGRA
 187         bool "NVIDIA Tegra SoC Family"
 188         select ARCH_HAS_RESET_CONTROLLER
 189         select ARCH_REQUIRE_GPIOLIB
 190         select CLKDEV_LOOKUP
 191         select CLKSRC_MMIO
 192         select CLKSRC_OF
 193         select GENERIC_CLOCKEVENTS
 194         select HAVE_CLK
 195         select PINCTRL
 196         select RESET_CONTROLLER
 197         help
 198           This enables support for the NVIDIA Tegra SoC family.
 199
 200 config ARCH_TEGRA_132_SOC
 201         bool "NVIDIA Tegra132 SoC"
 202         depends on ARCH_TEGRA
 203         select PINCTRL_TEGRA124
 204         select USB_ULPI if USB_PHY
 205         select USB_ULPI_VIEWPORT if USB_PHY
 206         help
 207           Enable support for NVIDIA Tegra132 SoC, based on the Denver
 208           ARMv8 CPU.  The Tegra132 SoC is similar to the Tegra124 SoC,
 209           but contains an NVIDIA Denver CPU complex in place of
 210           Tegra124's "4+1" Cortex-A15 CPU complex.
 211
 212 config ARCH_THUNDER
 213         bool "Cavium Inc. Thunder SoC Family"
 214         help
 215           This enables support for Cavium's Thunder Family of SoCs.
 216
 217 config ARCH_VEXPRESS
 218         bool "ARMv8 software model (Versatile Express)"
 219         select ARCH_REQUIRE_GPIOLIB
 220         select COMMON_CLK_VERSATILE
 221         select POWER_RESET_VEXPRESS
 222         select VEXPRESS_CONFIG
 223         help
 224           This enables support for the ARMv8 software model (Versatile
 225           Express).
 226
 227 config ARCH_XGENE
 228         bool "AppliedMicro X-Gene SOC Family"
 229         help
 230           This enables support for AppliedMicro X-Gene SOC Family
 231
 232 endmenu
 233
 234 menu "Bus support"
 235
 236 config PCI
 237         bool "PCI support"
 238         help
 239           This feature enables support for PCI bus system. If you say Y
 240           here, the kernel will include drivers and infrastructure code
 241           to support PCI bus devices.
 242
 243 config PCI_DOMAINS
 244         def_bool PCI
 245
 246 config PCI_DOMAINS_GENERIC
 247         def_bool PCI
 248
 249 config PCI_SYSCALL
 250         def_bool PCI
 251
 252 source "drivers/pci/Kconfig"
 253 source "drivers/pci/pcie/Kconfig"
 254 source "drivers/pci/hotplug/Kconfig"
 255
 256 endmenu
 257
 258 menu "Kernel Features"
 259
 260 menu "ARM errata workarounds via the alternatives framework"
 261
 262 config ARM64_ERRATUM_826319
 263         bool "Cortex-A53: 826319: System might deadlock if a write cannot complete until read data is accepted"
 264         default y
 265         help
 266           This option adds an alternative code sequence to work around ARM
 267           erratum 826319 on Cortex-A53 parts up to r0p2 with an AMBA 4 ACE or
 268           AXI master interface and an L2 cache.
 269
 270           If a Cortex-A53 uses an AMBA AXI4 ACE interface to other processors
 271           and is unable to accept a certain write via this interface, it will
 272           not progress on read data presented on the read data channel and the
 273           system can deadlock.
 274
 275           The workaround promotes data cache clean instructions to
 276           data cache clean-and-invalidate.
 277           Please note that this does not necessarily enable the workaround,
 278           as it depends on the alternative framework, which will only patch
 279           the kernel if an affected CPU is detected.
 280
 281           If unsure, say Y.
 282
 283 config ARM64_ERRATUM_827319
 284         bool "Cortex-A53: 827319: Data cache clean instructions might cause overlapping transactions to the interconnect"
 285         default y
 286         help
 287           This option adds an alternative code sequence to work around ARM
 288           erratum 827319 on Cortex-A53 parts up to r0p2 with an AMBA 5 CHI
 289           master interface and an L2 cache.
 290
 291           Under certain conditions this erratum can cause a clean line eviction
 292           to occur at the same time as another transaction to the same address
 293           on the AMBA 5 CHI interface, which can cause data corruption if the
 294           interconnect reorders the two transactions.
 295
 296           The workaround promotes data cache clean instructions to
 297           data cache clean-and-invalidate.
 298           Please note that this does not necessarily enable the workaround,
 299           as it depends on the alternative framework, which will only patch
 300           the kernel if an affected CPU is detected.
 301
 302           If unsure, say Y.
 303
 304 config ARM64_ERRATUM_824069
 305         bool "Cortex-A53: 824069: Cache line might not be marked as clean after a CleanShared snoop"
 306         default y
 307         help
 308           This option adds an alternative code sequence to work around ARM
 309           erratum 824069 on Cortex-A53 parts up to r0p2 when it is connected
 310           to a coherent interconnect.
 311
 312           If a Cortex-A53 processor is executing a store or prefetch for
 313           write instruction at the same time as a processor in another
 314           cluster is executing a cache maintenance operation to the same
 315           address, then this erratum might cause a clean cache line to be
 316           incorrectly marked as dirty.
 317
 318           The workaround promotes data cache clean instructions to
 319           data cache clean-and-invalidate.
 320           Please note that this option does not necessarily enable the
 321           workaround, as it depends on the alternative framework, which will
 322           only patch the kernel if an affected CPU is detected.
 323
 324           If unsure, say Y.
 325
 326 config ARM64_ERRATUM_819472
 327         bool "Cortex-A53: 819472: Store exclusive instructions might cause data corruption"
 328         default y
 329         help
 330           This option adds an alternative code sequence to work around ARM
 331           erratum 819472 on Cortex-A53 parts up to r0p1 with an L2 cache
 332           present when it is connected to a coherent interconnect.
 333
 334           If the processor is executing a load and store exclusive sequence at
 335           the same time as a processor in another cluster is executing a cache
 336           maintenance operation to the same address, then this erratum might
 337           cause data corruption.
 338
 339           The workaround promotes data cache clean instructions to
 340           data cache clean-and-invalidate.
 341           Please note that this does not necessarily enable the workaround,
 342           as it depends on the alternative framework, which will only patch
 343           the kernel if an affected CPU is detected.
 344
 345           If unsure, say Y.
 346
 347 config ARM64_ERRATUM_832075
 348         bool "Cortex-A57: 832075: possible deadlock on mixing exclusive memory accesses with device loads"
 349         default y
 350         help
 351           This option adds an alternative code sequence to work around ARM
 352           erratum 832075 on Cortex-A57 parts up to r1p2.
 353
 354           Affected Cortex-A57 parts might deadlock when exclusive load/store
 355           instructions to Write-Back memory are mixed with Device loads.
 356
 357           The workaround is to promote device loads to use Load-Acquire
 358           semantics.
 359           Please note that this does not necessarily enable the workaround,
 360           as it depends on the alternative framework, which will only patch
 361           the kernel if an affected CPU is detected.
 362
 363           If unsure, say Y.
 364
 365 endmenu
 366
 367
 368 choice
 369         prompt "Page size"
 370         default ARM64_4K_PAGES
 371         help
 372           Page size (translation granule) configuration.
 373
 374 config ARM64_4K_PAGES
 375         bool "4KB"
 376         help
 377           This feature enables 4KB pages support.
 378
 379 config ARM64_64K_PAGES
 380         bool "64KB"
 381         help
 382           This feature enables 64KB pages support (4KB by default)
 383           allowing only two levels of page tables and faster TLB
 384           look-up. AArch32 emulation is not available when this feature
 385           is enabled.
 386
 387 endchoice
 388
 389 choice
 390         prompt "Virtual address space size"
 391         default ARM64_VA_BITS_39 if ARM64_4K_PAGES
 392         default ARM64_VA_BITS_42 if ARM64_64K_PAGES
 393         help
 394           Allows choosing one of multiple possible virtual address
 395           space sizes. The level of translation table is determined by
 396           a combination of page size and virtual address space size.
 397
 398 config ARM64_VA_BITS_39
 399         bool "39-bit"
 400         depends on ARM64_4K_PAGES
 401
 402 config ARM64_VA_BITS_42
 403         bool "42-bit"
 404         depends on ARM64_64K_PAGES
 405
 406 config ARM64_VA_BITS_48
 407         bool "48-bit"
 408
 409 endchoice
 410
 411 config ARM64_VA_BITS
 412         int
 413         default 39 if ARM64_VA_BITS_39
 414         default 42 if ARM64_VA_BITS_42
 415         default 48 if ARM64_VA_BITS_48
 416
 417 config ARM64_PGTABLE_LEVELS
 418         int
 419         default 2 if ARM64_64K_PAGES && ARM64_VA_BITS_42
 420         default 3 if ARM64_64K_PAGES && ARM64_VA_BITS_48
 421         default 3 if ARM64_4K_PAGES && ARM64_VA_BITS_39
 422         default 4 if ARM64_4K_PAGES && ARM64_VA_BITS_48
 423
 424 config CPU_BIG_ENDIAN
 425        bool "Build big-endian kernel"
 426        help
 427          Say Y if you plan on running a kernel in big-endian mode.
 428
 429 config SMP
 430         bool "Symmetric Multi-Processing"
 431         help
 432           This enables support for systems with more than one CPU.  If
 433           you say N here, the kernel will run on single and
 434           multiprocessor machines, but will use only one CPU of a
 435           multiprocessor machine. If you say Y here, the kernel will run
 436           on many, but not all, single processor machines. On a single
 437           processor machine, the kernel will run faster if you say N
 438           here.
 439
 440           If you don't know what to do here, say N.
 441
 442 config SCHED_MC
 443         bool "Multi-core scheduler support"
 444         depends on SMP
 445         help
 446           Multi-core scheduler support improves the CPU scheduler's decision
 447           making when dealing with multi-core CPU chips at a cost of slightly
 448           increased overhead in some places. If unsure say N here.
 449
 450 config SCHED_SMT
 451         bool "SMT scheduler support"
 452         depends on SMP
 453         help
 454           Improves the CPU scheduler's decision making when dealing with
 455           MultiThreading at a cost of slightly increased overhead in some
 456           places. If unsure say N here.
 457
 458 config NR_CPUS
 459         int "Maximum number of CPUs (2-64)"
 460         range 2 64
 461         depends on SMP
 462         # These have to remain sorted largest to smallest
 463         default "64"
 464
 465 config HOTPLUG_CPU
 466         bool "Support for hot-pluggable CPUs"
 467         depends on SMP
 468         help
 469           Say Y here to experiment with turning CPUs off and on.  CPUs
 470           can be controlled through /sys/devices/system/cpu.
 471
 472 source kernel/Kconfig.preempt
 473
 474 config HZ
 475         int
 476         default 100
 477
 478 config ARCH_HAS_HOLES_MEMORYMODEL
 479         def_bool y if SPARSEMEM
 480
 481 config ARCH_SPARSEMEM_ENABLE
 482         def_bool y
 483         select SPARSEMEM_VMEMMAP_ENABLE
 484
 485 config ARCH_SPARSEMEM_DEFAULT
 486         def_bool ARCH_SPARSEMEM_ENABLE
 487
 488 config ARCH_SELECT_MEMORY_MODEL
 489         def_bool ARCH_SPARSEMEM_ENABLE
 490
 491 config HAVE_ARCH_PFN_VALID
 492         def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
 493
 494 config HW_PERF_EVENTS
 495         bool "Enable hardware performance counter support for perf events"
 496         depends on PERF_EVENTS
 497         default y
 498         help
 499           Enable hardware performance counter support for perf events. If
 500           disabled, perf events will use software events only.
 501
 502 config SYS_SUPPORTS_HUGETLBFS
 503         def_bool y
 504
 505 config ARCH_WANT_GENERAL_HUGETLB
 506         def_bool y
 507
 508 config ARCH_WANT_HUGE_PMD_SHARE
 509         def_bool y if !ARM64_64K_PAGES
 510
 511 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
 512         def_bool y
 513
 514 config ARCH_HAS_CACHE_LINE_SIZE
 515         def_bool y
 516
 517 source "mm/Kconfig"
 518
 519 config SECCOMP
 520         bool "Enable seccomp to safely compute untrusted bytecode"
 521         ---help---
 522           This kernel feature is useful for number crunching applications
 523           that may need to compute untrusted bytecode during their
 524           execution. By using pipes or other transports made available to
 525           the process as file descriptors supporting the read/write
 526           syscalls, it's possible to isolate those applications in
 527           their own address space using seccomp. Once seccomp is
 528           enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
 529           and the task is only allowed to execute a few safe syscalls
 530           defined by each seccomp mode.
 531
 532 config XEN_DOM0
 533         def_bool y
 534         depends on XEN
 535
 536 config XEN
 537         bool "Xen guest support on ARM64"
 538         depends on ARM64 && OF
 539         select SWIOTLB_XEN
 540         help
 541           Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64.
 542
 543 config FORCE_MAX_ZONEORDER
 544         int
 545         default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
 546         default "11"
 547
 548 menuconfig ARMV8_DEPRECATED
 549         bool "Emulate deprecated/obsolete ARMv8 instructions"
 550         depends on COMPAT
 551         help
 552           Legacy software support may require certain instructions
 553           that have been deprecated or obsoleted in the architecture.
 554
 555           Enable this config to enable selective emulation of these
 556           features.
 557
 558           If unsure, say Y
 559
 560 if ARMV8_DEPRECATED
 561
 562 config SWP_EMULATION
 563         bool "Emulate SWP/SWPB instructions"
 564         help
 565           ARMv8 obsoletes the use of A32 SWP/SWPB instructions such that
 566           they are always undefined. Say Y here to enable software
 567           emulation of these instructions for userspace using LDXR/STXR.
 568
 569           In some older versions of glibc [<=2.8] SWP is used during futex
 570           trylock() operations with the assumption that the code will not
 571           be preempted. This invalid assumption may be more likely to fail
 572           with SWP emulation enabled, leading to deadlock of the user
 573           application.
 574
 575           NOTE: when accessing uncached shared regions, LDXR/STXR rely
 576           on an external transaction monitoring block called a global
 577           monitor to maintain update atomicity. If your system does not
 578           implement a global monitor, this option can cause programs that
 579           perform SWP operations to uncached memory to deadlock.
 580
 581           If unsure, say Y
 582
 583 config CP15_BARRIER_EMULATION
 584         bool "Emulate CP15 Barrier instructions"
 585         help
 586           The CP15 barrier instructions - CP15ISB, CP15DSB, and
 587           CP15DMB - are deprecated in ARMv8 (and ARMv7). It is
 588           strongly recommended to use the ISB, DSB, and DMB
 589           instructions instead.
 590
 591           Say Y here to enable software emulation of these
 592           instructions for AArch32 userspace code. When this option is
 593           enabled, CP15 barrier usage is traced which can help
 594           identify software that needs updating.
 595
 596           If unsure, say Y
 597
 598 config SETEND_EMULATION
 599         bool "Emulate SETEND instruction"
 600         help
 601           The SETEND instruction alters the data-endianness of the
 602           AArch32 EL0, and is deprecated in ARMv8.
 603
 604           Say Y here to enable software emulation of the instruction
 605           for AArch32 userspace code.
 606
 607           Note: All the cpus on the system must have mixed endian support at EL0
 608           for this feature to be enabled. If a new CPU - which doesn't support mixed
 609           endian - is hotplugged in after this feature has been enabled, there could
 610           be unexpected results in the applications.
 611
 612           If unsure, say Y
 613 endif
 614
 615 endmenu
 616
 617 menu "Boot options"
 618
 619 config CMDLINE
 620         string "Default kernel command string"
 621         default ""
 622         help
 623           Provide a set of default command-line options at build time by
 624           entering them here. As a minimum, you should specify the the
 625           root device (e.g. root=/dev/nfs).
 626
 627 config CMDLINE_FORCE
 628         bool "Always use the default kernel command string"
 629         help
 630           Always use the default kernel command string, even if the boot
 631           loader passes other arguments to the kernel.
 632           This is useful if you cannot or don't want to change the
 633           command-line options your boot loader passes to the kernel.
 634
 635 config EFI_STUB
 636         bool
 637
 638 config EFI
 639         bool "UEFI runtime support"
 640         depends on OF && !CPU_BIG_ENDIAN
 641         select LIBFDT
 642         select UCS2_STRING
 643         select EFI_PARAMS_FROM_FDT
 644         select EFI_RUNTIME_WRAPPERS
 645         select EFI_STUB
 646         select EFI_ARMSTUB
 647         default y
 648         help
 649           This option provides support for runtime services provided
 650           by UEFI firmware (such as non-volatile variables, realtime
 651           clock, and platform reset). A UEFI stub is also provided to
 652           allow the kernel to be booted as an EFI application. This
 653           is only useful on systems that have UEFI firmware.
 654
 655 config DMI
 656         bool "Enable support for SMBIOS (DMI) tables"
 657         depends on EFI
 658         default y
 659         help
 660           This enables SMBIOS/DMI feature for systems.
 661
 662           This option is only useful on systems that have UEFI firmware.
 663           However, even with this option, the resultant kernel should
 664           continue to boot on existing non-UEFI platforms.
 665
 666 endmenu
 667
 668 menu "Userspace binary formats"
 669
 670 source "fs/Kconfig.binfmt"
 671
 672 config COMPAT
 673         bool "Kernel support for 32-bit EL0"
 674         depends on !ARM64_64K_PAGES
 675         select COMPAT_BINFMT_ELF
 676         select HAVE_UID16
 677         select OLD_SIGSUSPEND3
 678         select COMPAT_OLD_SIGACTION
 679         help
 680           This option enables support for a 32-bit EL0 running under a 64-bit
 681           kernel at EL1. AArch32-specific components such as system calls,
 682           the user helper functions, VFP support and the ptrace interface are
 683           handled appropriately by the kernel.
 684
 685           If you want to execute 32-bit userspace applications, say Y.
 686
 687 config SYSVIPC_COMPAT
 688         def_bool y
 689         depends on COMPAT && SYSVIPC
 690
 691 endmenu
 692
 693 menu "Power management options"
 694
 695 source "kernel/power/Kconfig"
 696
 697 config ARCH_SUSPEND_POSSIBLE
 698         def_bool y
 699
 700 endmenu
 701
 702 menu "CPU Power Management"
 703
 704 source "drivers/cpuidle/Kconfig"
 705
 706 source "drivers/cpufreq/Kconfig"
 707
 708 endmenu
 709
 710 source "net/Kconfig"
 711
 712 source "drivers/Kconfig"
 713
 714 source "drivers/firmware/Kconfig"
 715
 716 source "fs/Kconfig"
 717
 718 source "arch/arm64/kvm/Kconfig"
 719
 720 source "arch/arm64/Kconfig.debug"
 721
 722 source "security/Kconfig"
 723
 724 source "crypto/Kconfig"
 725 if CRYPTO
 726 source "arch/arm64/crypto/Kconfig"
 727 endif
 728
 729 source "lib/Kconfig"