arch/arm64/Kconfig

   1 config ARM64
   2         def_bool y
   3         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
   4         select ARCH_SUPPORTS_ATOMIC_RMW
   5         select ARCH_WANT_OPTIONAL_GPIOLIB
   6         select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
   7         select ARM_HAS_SG_CHAIN
   8         select ARCH_WANT_FRAME_POINTERS
   9         select ARM_AMBA
  10         select ARM_ARCH_TIMER
  11         select AUDIT_ARCH_COMPAT_GENERIC
  12         select CLONE_BACKWARDS
  13         select COMMON_CLK
  14         select ARM_GIC
  15         select GENERIC_CLOCKEVENTS
  16         select GENERIC_CLOCKEVENTS_BROADCAST if SMP
  17         select GENERIC_CPU_AUTOPROBE
  18         select GENERIC_IOMAP
  19         select GENERIC_IRQ_PROBE
  20         select GENERIC_IRQ_SHOW
  21         select GENERIC_SMP_IDLE_THREAD
  22         select GENERIC_TIME_VSYSCALL
  23         select HARDIRQS_SW_RESEND
  24         select HAVE_ARCH_JUMP_LABEL
  25         select HAVE_ARCH_AUDITSYSCALL
  26         select HAVE_ARCH_SECCOMP_FILTER
  27         select HAVE_ARCH_KGDB
  28         select HAVE_ARCH_TRACEHOOK
  29         select HAVE_C_RECORDMCOUNT
  30         select HAVE_DEBUG_BUGVERBOSE
  31         select HAVE_DEBUG_KMEMLEAK
  32         select HAVE_DMA_API_DEBUG
  33         select HAVE_DMA_ATTRS
  34         select HAVE_DYNAMIC_FTRACE
  35         select HAVE_FTRACE_MCOUNT_RECORD
  36         select HAVE_FUNCTION_TRACER
  37         select HAVE_FUNCTION_GRAPH_TRACER
  38         select HAVE_GENERIC_DMA_COHERENT
  39         select HAVE_GENERIC_HARDIRQS
  40         select HAVE_HW_BREAKPOINT if PERF_EVENTS
  41         select HAVE_MEMBLOCK
  42         select HAVE_PERF_EVENTS
  43         select HAVE_SYSCALL_TRACEPOINTS
  44         select IRQ_DOMAIN
  45         select MODULES_USE_ELF_RELA
  46         select NO_BOOTMEM
  47         select OF
  48         select OF_EARLY_FLATTREE
  49         select OF_RESERVED_MEM
  50         select PERF_USE_VMALLOC
  51         select POWER_RESET
  52         select POWER_SUPPLY
  53         select RTC_LIB
  54         select SPARSE_IRQ
  55         select SYSCTL_EXCEPTION_TRACE
  56         help
  57           ARM 64-bit (AArch64) Linux support.
  58
  59 config ARM_HAS_SG_CHAIN
  60         def_bool y
  61
  62 config 64BIT
  63         def_bool y
  64
  65 config ARCH_PHYS_ADDR_T_64BIT
  66         def_bool y
  67
  68 config MMU
  69         def_bool y
  70
  71 config NO_IOPORT
  72         def_bool y
  73
  74 config STACKTRACE_SUPPORT
  75         def_bool y
  76
  77 config ILLEGAL_POINTER_VALUE
  78         hex
  79         default 0xdead000000000000
  80
  81 config LOCKDEP_SUPPORT
  82         def_bool y
  83
  84 config TRACE_IRQFLAGS_SUPPORT
  85         def_bool y
  86
  87 config GENERIC_LOCKBREAK
  88         def_bool y
  89         depends on SMP && PREEMPT
  90
  91 config RWSEM_GENERIC_SPINLOCK
  92         def_bool y
  93
  94 config ARCH_HAS_CPUFREQ
  95         bool
  96         help
  97           Internal node to signify that the ARCH has CPUFREQ support
  98           and that the relevant menu configurations are displayed for
  99           it.
 100
 101 config GENERIC_HWEIGHT
 102         def_bool y
 103
 104 config GENERIC_CSUM
 105         def_bool y
 106
 107 config GENERIC_CALIBRATE_DELAY
 108         def_bool y
 109
 110 config ZONE_DMA
 111         def_bool y
 112
 113 config ARCH_DMA_ADDR_T_64BIT
 114         def_bool y
 115
 116 config NEED_DMA_MAP_STATE
 117         def_bool y
 118
 119 config NEED_SG_DMA_LENGTH
 120         def_bool y
 121
 122 config SWIOTLB
 123         def_bool y
 124
 125 config IOMMU_HELPER
 126         def_bool SWIOTLB
 127
 128 config ARM_ERRATA_824069
 129         bool "ARM errata: Cache line might not be marked as clean after a CleanShared snoop"
 130         depends on SMP
 131         help
 132           This option enables the workaround for erratum 824069
 133           affecting Cortex-A53 MPCore with two or more processors (r0p0..r0p2).
 134           If a Cortex-A53 processor is executing a store or PLDW instruction at the same time
 135           as a processor in another cluster is executing a cache maintenance operation
 136           to the same address, then this erratum might cause a clean cache line to be
 137           incorrectly marked as dirty. This workaround replaces all cache clean opeartion
 138           to clean & invalidate.
 139
 140 config KERNEL_MODE_NEON
 141         def_bool y
 142
 143 source "init/Kconfig"
 144
 145 source "kernel/Kconfig.freezer"
 146
 147 menu "Platform selection"
 148
 149 config ARCH_VEXPRESS
 150         bool "ARMv8 software model (Versatile Express)"
 151         select ARCH_REQUIRE_GPIOLIB
 152         select COMMON_CLK_VERSATILE
 153         select POWER_RESET_VEXPRESS
 154         select VEXPRESS_CONFIG
 155         help
 156           This enables support for the ARMv8 software model (Versatile
 157           Express).
 158
 159 config ARCH_MT6735
 160         bool "MediaTek MT6735"
 161         select GENERIC_TIME
 162         select GENERIC_CLOCKEVENTS
 163         select ARCH_HAS_CPUFREQ
 164         select ARM_AMBA
 165         select CPU_V7
 166         select HAVE_SMP
 167         select NEED_MACH_MEMORY_H
 168         select IRQ_DOMAIN
 169         select IRQ_DOMAIN_DEBUG
 170         select GENERIC_SCHED_CLOCK
 171         select MTK_SYSTRACKER
 172         select ARMV7_COMPAT
 173         select ARMV7_COMPAT_CPUINFO
 174         help
 175           This enable support for MediaTek MT6735
 176
 177 config ARCH_MT6735M
 178         bool "MediaTek MT6735M"
 179         select GENERIC_TIME
 180         select GENERIC_CLOCKEVENTS
 181         select ARCH_HAS_CPUFREQ
 182         select ARM_AMBA
 183         select CPU_V7
 184         select HAVE_SMP
 185         select NEED_MACH_MEMORY_H
 186         select IRQ_DOMAIN
 187         select IRQ_DOMAIN_DEBUG
 188         select GENERIC_SCHED_CLOCK
 189         select MTK_SYSTRACKER
 190         select ARMV7_COMPAT
 191         select ARMV7_COMPAT_CPUINFO
 192         help
 193           This enable support for MediaTek MT6735M
 194
 195 config ARCH_MT6753
 196         bool "MediaTek MT6735M"
 197         select GENERIC_TIME
 198         select GENERIC_CLOCKEVENTS
 199         select ARCH_HAS_CPUFREQ
 200         select ARM_AMBA
 201         select CPU_V7
 202         select HAVE_SMP
 203         select NEED_MACH_MEMORY_H
 204         select IRQ_DOMAIN
 205         select IRQ_DOMAIN_DEBUG
 206         select GENERIC_SCHED_CLOCK
 207         select MTK_SYSTRACKER
 208         select ARMV7_COMPAT
 209         select ARMV7_COMPAT_CPUINFO
 210         help
 211           This enable support for MediaTek MT6753
 212
 213 config ARCH_MT6752
 214         bool "MediaTek MT6752"
 215         select GENERIC_TIME
 216         select GENERIC_CLOCKEVENTS
 217         select ARCH_HAS_CPUFREQ
 218         select ARM_AMBA
 219         select CPU_V7
 220         select HAVE_SMP
 221         select NEED_MACH_MEMORY_H
 222         select IRQ_DOMAIN
 223         select IRQ_DOMAIN_DEBUG
 224         select GENERIC_SCHED_CLOCK
 225         select MTK_SYSTRACKER
 226         select MTK_L2C_SHARE
 227         select ARCH_REQUIRE_GPIOLIB
 228         select MTK_ETM
 229         select MTK_EIC
 230         select ARMV7_COMPAT
 231         select ARMV7_COMPAT_CPUINFO
 232         help
 233           This enable support for MediaTek MT6752
 234
 235 config ARCH_MT6795
 236         bool "MediaTek MT6795"
 237         select GENERIC_TIME
 238         select GENERIC_CLOCKEVENTS
 239         select ARCH_HAS_CPUFREQ
 240         select ARM_AMBA
 241         select CPU_V7
 242         select HAVE_SMP
 243         select NEED_MACH_MEMORY_H
 244         select FIQ_GLUE
 245         select IRQ_DOMAIN
 246         select IRQ_DOMAIN_DEBUG
 247         select GENERIC_SCHED_CLOCK
 248         select ARCH_REQUIRE_GPIOLIB
 249         select MTK_CIRQ
 250         select MTK_CPU_STRESS
 251         select MTK_SYSTRACKER
 252         select MTK_LASTPC
 253         select ARMV7_COMPAT
 254         select ARMV7_COMPAT_CPUINFO
 255         help
 256           This enable support for MediaTek MT6795
 257 endmenu
 258
 259 source "drivers/misc/mediatek/mach/Kconfig"
 260
 261 menu "Bus support"
 262
 263 config ARM_AMBA
 264         bool
 265
 266 endmenu
 267
 268 menu "Kernel Features"
 269
 270 config ARM64_64K_PAGES
 271         bool "Enable 64KB pages support"
 272         help
 273           This feature enables 64KB pages support (4KB by default)
 274           allowing only two levels of page tables and faster TLB
 275           look-up. AArch32 emulation is not available when this feature
 276           is enabled.
 277
 278 config SMP
 279         bool "Symmetric Multi-Processing"
 280         select USE_GENERIC_SMP_HELPERS
 281         help
 282           This enables support for systems with more than one CPU.  If
 283           you say N here, the kernel will run on single and
 284           multiprocessor machines, but will use only one CPU of a
 285           multiprocessor machine. If you say Y here, the kernel will run
 286           on many, but not all, single processor machines. On a single
 287           processor machine, the kernel will run faster if you say N
 288           here.
 289
 290           If you don't know what to do here, say N.
 291
 292 config ARM_CPU_TOPOLOGY
 293         bool "Support CPU topology definition"
 294         depends on SMP
 295         default y
 296         help
 297           Support CPU topology definition, based on configuration
 298           provided by the firmware.
 299
 300 config SCHED_MC
 301         bool "Multi-core scheduler support"
 302         depends on ARM_CPU_TOPOLOGY
 303         help
 304           Multi-core scheduler support improves the CPU scheduler's decision
 305           making when dealing with multi-core CPU chips at a cost of slightly
 306           increased overhead in some places. If unsure say N here.
 307
 308 config SCHED_SMT
 309         bool "SMT scheduler support"
 310         depends on ARM_CPU_TOPOLOGY
 311         help
 312           Improves the CPU scheduler's decision making when dealing with
 313           MultiThreading at a cost of slightly increased overhead in some
 314           places. If unsure say N here.
 315
 316 config DISABLE_CPU_SCHED_DOMAIN_BALANCE
 317         bool "(EXPERIMENTAL) Disable CPU level scheduler load-balancing"
 318         help
 319           Disables scheduler load-balancing at CPU sched domain level.
 320
 321 config SCHED_HMP
 322         bool "(EXPERIMENTAL) Heterogenous multiprocessor scheduling"
 323         depends on DISABLE_CPU_SCHED_DOMAIN_BALANCE && SCHED_MC && FAIR_GROUP_SCHED && !SCHED_AUTOGROUP
 324         help
 325           Experimental scheduler optimizations for heterogeneous platforms.
 326           Attempts to introspectively select task affinity to optimize power
 327           and performance. Basic support for multiple (>2) cpu types is in place,
 328           but it has only been tested with two types of cpus.
 329           There is currently no support for migration of task groups, hence
 330           !SCHED_AUTOGROUP. Furthermore, normal load-balancing must be disabled
 331           between cpus of different type (DISABLE_CPU_SCHED_DOMAIN_BALANCE).
 332
 333 config SCHED_HMP_PRIO_FILTER
 334         bool "(EXPERIMENTAL) Filter HMP migrations by task priority"
 335         depends on SCHED_HMP
 336         help
 337           Enables task priority based HMP migration filter. Any task with
 338           a NICE value above the threshold will always be on low-power cpus
 339           with less compute capacity.
 340
 341 config SCHED_HMP_PRIO_FILTER_VAL
 342         int "NICE priority threshold"
 343         default 5
 344         depends on SCHED_HMP_PRIO_FILTER
 345
 346 config HMP_FAST_CPU_MASK
 347         string "HMP scheduler fast CPU mask"
 348         depends on SCHED_HMP
 349         help
 350           Leave empty to use device tree information.
 351           Specify the cpuids of the fast CPUs in the system as a list string,
 352           e.g. cpuid 0+1 should be specified as 0-1.
 353
 354 config HMP_SLOW_CPU_MASK
 355         string "HMP scheduler slow CPU mask"
 356         depends on SCHED_HMP
 357         help
 358           Leave empty to use device tree information.
 359           Specify the cpuids of the slow CPUs in the system as a list string,
 360           e.g. cpuid 0+1 should be specified as 0-1.
 361
 362 config HMP_VARIABLE_SCALE
 363         bool "Allows changing the load tracking scale through sysfs"
 364         depends on SCHED_HMP
 365         help
 366           When turned on, this option exports the thresholds and load average
 367           period value for the load tracking patches through sysfs.
 368           The values can be modified to change the rate of load accumulation
 369           and the thresholds used for HMP migration.
 370           The load_avg_period_ms is the time in ms to reach a load average of
 371           0.5 for an idle task of 0 load average ratio that start a busy loop.
 372           The up_threshold and down_threshold is the value to go to a faster
 373           CPU or to go back to a slower cpu.
 374           The {up,down}_threshold are devided by 1024 before being compared
 375           to the load average.
 376           For examples, with load_avg_period_ms = 128 and up_threshold = 512,
 377           a running task with a load of 0 will be migrated to a bigger CPU after
 378           128ms, because after 128ms its load_avg_ratio is 0.5 and the real
 379           up_threshold is 0.5.
 380           This patch has the same behavior as changing the Y of the load
 381           average computation to
 382                 (1002/1024)^(LOAD_AVG_PERIOD/load_avg_period_ms)
 383           but it remove intermadiate overflows in computation.
 384
 385 config MET_SCHED_HMP
 386         bool "(EXPERIMENTAL) MET SCHED HMP Info"
 387         depends on SCHED_HMP_ENHANCEMENT
 388         depends on HMP_TRACER
 389         help
 390           MET SCHED HMP Info
 391
 392 config HMP_FREQUENCY_INVARIANT_SCALE
 393         bool "(EXPERIMENTAL) Frequency-Invariant Tracked Load for HMP"
 394         depends on HMP_VARIABLE_SCALE && CPU_FREQ
 395         depends on !ARCH_SCALE_INVARIANT_CPU_CAPACITY
 396         help
 397           Scales the current load contribution in line with the frequency
 398           of the CPU that the task was executed on.
 399           In this version, we use a simple linear scale derived from the
 400           maximum frequency reported by CPUFreq.
 401           Restricting tracked load to be scaled by the CPU's frequency
 402           represents the consumption of possible compute capacity
 403           (rather than consumption of actual instantaneous capacity as
 404           normal) and allows the HMP migration's simple threshold
 405           migration strategy to interact more predictably with CPUFreq's
 406           asynchronous compute capacity changes.
 407
 408 config SCHED_HMP_ENHANCEMENT
 409         bool "(EXPERIMENTAL) HMP Ennhancement"
 410         depends on SCHED_HMP
 411         help
 412           HMP Ennhancement
 413
 414 config HMP_TRACER
 415         bool "(EXPERIMENTAL) Profile HMP scheduler"
 416         depends on SCHED_HMP_ENHANCEMENT
 417         help
 418           Profile HMP scheduler
 419
 420 config HMP_DYNAMIC_THRESHOLD
 421         bool "(EXPERIMENTAL) Dynamically adjust task migration threshold"
 422         depends on SCHED_HMP_ENHANCEMENT
 423         help
 424           Dynamically adjust task migration threshold according to current system load
 425
 426 config HMP_GLOBAL_BALANCE
 427         bool "(EXPERIMENTAL) Enhance HMP global load balance"
 428         depends on SCHED_HMP_ENHANCEMENT
 429         help
 430           Enhance HMP global load balance
 431
 432 config HMP_TASK_ASSIGNMENT
 433         bool "(EXPERIMENTAL) Enhance HMP task assignment"
 434         depends on SCHED_HMP_ENHANCEMENT
 435         help
 436           Enhance HMP task assignment
 437
 438 config HMP_DISCARD_CFS_SELECTION_RESULT
 439         bool "(EXPERIMENTAL) Discard CFS runqueue selection result"
 440         depends on SCHED_HMP_ENHANCEMENT && HMP_TASK_ASSIGNMENT
 441         help
 442           Discard CFS runqueue selection result even if only one cluster exists
 443
 444 config HMP_PACK_SMALL_TASK
 445         bool "(EXPERIMENTAL) Packing Small Tasks"
 446         depends on SCHED_HMP_ENHANCEMENT
 447         help
 448                 This option enables Packing Small Tasks
 449
 450 config HMP_PACK_BUDDY_INFO
 451         bool "(EXPERIMENTAL) Packing Small Tasks Buddy Information Log"
 452         depends on SCHED_HMP_ENHANCEMENT && HMP_PACK_SMALL_TASK
 453         help
 454                 This option enables Packing Small Tasks Buddy Information Log
 455
 456 config HMP_LAZY_BALANCE
 457         bool "(EXPERIMENTAL) Lazy Balance"
 458         depends on SCHED_HMP_ENHANCEMENT && HMP_PACK_SMALL_TASK
 459         help
 460                 This option enables Lazy Balance
 461
 462 config HMP_POWER_AWARE_CONTROLLER
 463         bool "(EXPERIMENTAL) Power-aware Scheduler for b.L MP Controller"
 464         depends on SCHED_HMP_ENHANCEMENT && HMP_PACK_SMALL_TASK && HMP_LAZY_BALANCE
 465         help
 466                 Power-aware scheduler for b.L MP controller and status interface
 467
 468 config HEVTASK_INTERFACE
 469         bool "task status interface"
 470         help
 471           The option provide an interface to show task status
 472
 473 config ARCH_SCALE_INVARIANT_CPU_CAPACITY
 474         bool "(EXPERIMENTAL) Scale-Invariant CPU Compute Capacity Recording"
 475         depends on CPU_FREQ
 476         help
 477             Provides a new measure of maximum and instantaneous CPU compute
 478             capacity, derived from a table of relative compute performance
 479             for each core type present in the system. The table is an
 480             estimate and specific core performance may be different for
 481             any particular workload. The measure includes the relative
 482             performance and a linear scale of current to maximum frequency
 483             such that at maximum frequency (as expressed in the DTB) the
 484             reported compute capacity will be equal to the estimated
 485             performance from the table. Values range between 0 and 1023 where
 486             1023 is the highest capacity available in the system.
 487
 488 config NR_CPUS
 489         int "Maximum number of CPUs (2-32)"
 490         range 2 32
 491         depends on SMP
 492         default "4"
 493
 494 config SWP_EMULATE
 495         bool "Emulate SWP/SWPB instructions"
 496         help
 497           ARMv6 architecture deprecates use of the SWP/SWPB instructions. ARMv8
 498           oblosetes the use of SWP/SWPB instructions. ARMv7 multiprocessing
 499           extensions introduce the ability to disable these instructions,
 500           triggering an undefined instruction exception when executed. Say Y
 501           here to enable software emulation of these instructions for userspace
 502           (not kernel) using LDREX/STREX. Also creates /proc/cpu/swp_emulation
 503           for statistics.
 504
 505           In some older versions of glibc [<=2.8] SWP is used during futex
 506           trylock() operations with the assumption that the code will not
 507           be preempted. This invalid assumption may be more likely to fail
 508           with SWP emulation enabled, leading to deadlock of the user
 509           application.
 510
 511           NOTE: when accessing uncached shared regions, LDREX/STREX rely
 512           on an external transaction monitoring block called a global
 513           monitor to maintain update atomicity. If your system does not
 514           implement a global monitor, this option can cause programs that
 515           perform SWP operations to uncached memory to deadlock.
 516
 517           If unsure, say Y.
 518
 519 config HOTPLUG_CPU
 520         bool "Support for hot-pluggable CPUs"
 521         depends on SMP
 522         help
 523           Say Y here to experiment with turning CPUs off and on.  CPUs
 524           can be controlled through /sys/devices/system/cpu.
 525
 526 source kernel/Kconfig.preempt
 527
 528 config HZ
 529         int
 530         default 100
 531
 532 config ARCH_HAS_HOLES_MEMORYMODEL
 533         def_bool y if SPARSEMEM
 534
 535 config ARCH_SPARSEMEM_ENABLE
 536         def_bool y
 537         select SPARSEMEM_VMEMMAP_ENABLE
 538
 539 config ARCH_SPARSEMEM_DEFAULT
 540         def_bool ARCH_SPARSEMEM_ENABLE
 541
 542 config ARCH_SELECT_MEMORY_MODEL
 543         def_bool ARCH_SPARSEMEM_ENABLE
 544
 545 config HAVE_ARCH_PFN_VALID
 546         def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
 547
 548 config HW_PERF_EVENTS
 549         bool "Enable hardware performance counter support for perf events"
 550         depends on PERF_EVENTS
 551         default y
 552         help
 553           Enable hardware performance counter support for perf events. If
 554           disabled, perf events will use software events only.
 555
 556 config ARMV7_COMPAT
 557         bool "Kernel support for ARMv7 applications"
 558         depends on COMPAT
 559         select SWP_EMULATE
 560         help
 561          This option enables features that allow that ran on an ARMv7 or older
 562          processor to continue functioning.
 563
 564          If you want to execute ARMv7 applications, say Y
 565
 566 config ARMV7_COMPAT_CPUINFO
 567         bool "Report backwards compatible cpu features in /proc/cpuinfo"
 568         depends on ARMV7_COMPAT
 569         default y
 570         help
 571          This option makes /proc/cpuinfo list CPU features that an ARMv7 or
 572          earlier kernel would report, but are not optional on an ARMv8 or later
 573          processor.
 574
 575          If you want to execute ARMv7 applications, say Y
 576
 577 source "mm/Kconfig"
 578
 579 config SECCOMP
 580         bool "Enable seccomp to safely compute untrusted bytecode"
 581         ---help---
 582           This kernel feature is useful for number crunching applications
 583           that may need to compute untrusted bytecode during their
 584           execution. By using pipes or other transports made available to
 585           the process as file descriptors supporting the read/write
 586           syscalls, it's possible to isolate those applications in
 587           their own address space using seccomp. Once seccomp is
 588           enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
 589           and the task is only allowed to execute a few safe syscalls
 590           defined by each seccomp mode.
 591
 592
 593 endmenu
 594
 595 menu "Boot options"
 596
 597 config CMDLINE
 598         string "Default kernel command string"
 599         default ""
 600         help
 601           Provide a set of default command-line options at build time by
 602           entering them here. As a minimum, you should specify the the
 603           root device (e.g. root=/dev/nfs).
 604
 605 choice
 606         prompt "Kernel command line type" if CMDLINE != ""
 607         default CMDLINE_FROM_BOOTLOADER
 608
 609 config CMDLINE_FROM_BOOTLOADER
 610         bool "Use bootloader kernel arguments if available"
 611         help
 612           Uses the command-line options passed by the boot loader. If
 613           the boot loader doesn't provide any, the default kernel command
 614           string provided in CMDLINE will be used.
 615
 616 config CMDLINE_EXTEND
 617         bool "Extend bootloader kernel arguments"
 618         help
 619           The command-line arguments provided by the boot loader will be
 620           appended to the default kernel command string.
 621
 622 config CMDLINE_FORCE
 623         bool "Always use the default kernel command string"
 624         help
 625           Always use the default kernel command string, even if the boot
 626           loader passes other arguments to the kernel.
 627           This is useful if you cannot or don't want to change the
 628           command-line options your boot loader passes to the kernel.
 629 endchoice
 630
 631 config BUILD_ARM64_APPENDED_DTB_IMAGE
 632         bool "Build a concatenated Image.gz/dtb by default"
 633         depends on OF
 634         help
 635           Enabling this option will cause a concatenated Image.gz and list of
 636           DTBs to be built by default (instead of a standalone Image.gz.)
 637           The image will built in arch/arm64/boot/Image.gz-dtb
 638
 639 config BUILD_ARM64_APPENDED_DTB_IMAGE_NAMES
 640         string "Default dtb names"
 641         depends on BUILD_ARM64_APPENDED_DTB_IMAGE
 642         help
 643           Space separated list of names of dtbs to append when
 644           building a concatenated Image.gz-dtb.
 645
 646 endmenu
 647
 648 menu "CPU Power Management"
 649
 650 if ARCH_HAS_CPUFREQ
 651 source "drivers/cpufreq/Kconfig"
 652 endif
 653
 654 endmenu
 655
 656 menu "Userspace binary formats"
 657
 658 source "fs/Kconfig.binfmt"
 659
 660 config COMPAT
 661         bool "Kernel support for 32-bit EL0"
 662         depends on !ARM64_64K_PAGES
 663         select COMPAT_BINFMT_ELF
 664         select HAVE_UID16
 665         select OLD_SIGSUSPEND3
 666         select COMPAT_OLD_SIGACTION
 667         help
 668           This option enables support for a 32-bit EL0 running under a 64-bit
 669           kernel at EL1. AArch32-specific components such as system calls,
 670           the user helper functions, VFP support and the ptrace interface are
 671           handled appropriately by the kernel.
 672
 673           If you want to execute 32-bit userspace applications, say Y.
 674
 675 config SYSVIPC_COMPAT
 676         def_bool y
 677         depends on COMPAT && SYSVIPC
 678
 679 endmenu
 680
 681 menu "Power management options"
 682
 683 source "kernel/power/Kconfig"
 684
 685 config ARCH_SUSPEND_POSSIBLE
 686        depends on !ARCH_S5PC100
 687        depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \
 688                CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK || ARM64
 689        def_bool y
 690
 691 config ARM64_CPU_SUSPEND
 692        def_bool PM_SLEEP
 693
 694 config ARCH_HIBERNATION_POSSIBLE
 695         bool
 696         depends on MMU
 697         default y if ARCH_SUSPEND_POSSIBLE
 698
 699 endmenu
 700
 701 source "net/Kconfig"
 702
 703 source "drivers/Kconfig"
 704
 705 source "fs/Kconfig"
 706
 707 source "arch/arm64/Kconfig.debug"
 708
 709 source "security/Kconfig"
 710
 711 source "crypto/Kconfig"
 712 if CRYPTO
 713 source "arch/arm64/crypto/Kconfig"
 714 endif
 715
 716 source "lib/Kconfig"
 717