arch/arm64/Kconfig

config ARM64
	def_bool y
	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
	select ARCH_SUPPORTS_ATOMIC_RMW
	select ARCH_WANT_OPTIONAL_GPIOLIB
	select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
	select ARCH_WANT_FRAME_POINTERS
	select ARM_AMBA
	select ARM_ARCH_TIMER
	select ARM_GIC
	select AUDIT_ARCH_COMPAT_GENERIC
	select CLONE_BACKWARDS
	select COMMON_CLK
	select GENERIC_CLOCKEVENTS
	select GENERIC_CLOCKEVENTS_BROADCAST if SMP
	select GENERIC_CPU_AUTOPROBE
	select GENERIC_IOMAP
	select GENERIC_IRQ_PROBE
	select GENERIC_IRQ_SHOW
	select GENERIC_SMP_IDLE_THREAD
	select GENERIC_TIME_VSYSCALL
	select HARDIRQS_SW_RESEND
	select HAVE_ARCH_AUDITSYSCALL
	select HAVE_ARCH_MMAP_RND_BITS
	select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
	select HAVE_ARCH_SECCOMP_FILTER
	select HAVE_ARCH_TRACEHOOK
	select HAVE_DEBUG_BUGVERBOSE
	select HAVE_DEBUG_KMEMLEAK
	select HAVE_DMA_API_DEBUG
	select HAVE_DMA_ATTRS
	select HAVE_GENERIC_DMA_COHERENT
	select HAVE_GENERIC_HARDIRQS
	select HAVE_HW_BREAKPOINT if PERF_EVENTS
	select HAVE_MEMBLOCK
	select HAVE_PERF_EVENTS
	select IRQ_DOMAIN
	select MODULES_USE_ELF_RELA
	select NO_BOOTMEM
	select OF
	select OF_EARLY_FLATTREE
	select PERF_USE_VMALLOC
	select POWER_RESET
	select POWER_SUPPLY
	select RTC_LIB
	select SPARSE_IRQ
	select SYSCTL_EXCEPTION_TRACE
	help
	  ARM 64-bit (AArch64) Linux support.

config 64BIT
	def_bool y

config ARCH_PHYS_ADDR_T_64BIT
	def_bool y

config MMU
	def_bool y

config NO_IOPORT
	def_bool y

config ARCH_MMAP_RND_BITS_MIN
       default 14 if ARM64_64K_PAGES
       default 18

# max bits determined by the following formula:
#  VA_BITS - PAGE_SHIFT - 3
#  VA_BITS is always 39
config ARCH_MMAP_RND_BITS_MAX
       default 20 if ARM64_64K_PAGES
       default 24

config ARCH_MMAP_RND_COMPAT_BITS_MIN
       default 11

config ARCH_MMAP_RND_COMPAT_BITS_MAX
       default 16

config ILLEGAL_POINTER_VALUE
	hex
	default 0xdead000000000000

config STACKTRACE_SUPPORT
	def_bool y

config ILLEGAL_POINTER_VALUE
	hex
	default 0xdead000000000000

config LOCKDEP_SUPPORT
	def_bool y

config TRACE_IRQFLAGS_SUPPORT
	def_bool y

config GENERIC_LOCKBREAK
	def_bool y
	depends on SMP && PREEMPT

config RWSEM_GENERIC_SPINLOCK
	def_bool y

config GENERIC_HWEIGHT
	def_bool y

config GENERIC_CSUM
        def_bool y

config GENERIC_CALIBRATE_DELAY
	def_bool y

config ZONE_DMA32
	def_bool y

config ARCH_DMA_ADDR_T_64BIT
	def_bool y

config NEED_DMA_MAP_STATE
	def_bool y

config NEED_SG_DMA_LENGTH
	def_bool y

config SWIOTLB
	def_bool y

config IOMMU_HELPER
	def_bool SWIOTLB

source "init/Kconfig"

source "kernel/Kconfig.freezer"

menu "Platform selection"

config ARCH_VEXPRESS
	bool "ARMv8 software model (Versatile Express)"
	select ARCH_REQUIRE_GPIOLIB
	select COMMON_CLK_VERSATILE
	select POWER_RESET_VEXPRESS
	select VEXPRESS_CONFIG
	help
	  This enables support for the ARMv8 software model (Versatile
	  Express).

endmenu

menu "Bus support"

config ARM_AMBA
	bool

endmenu

menu "Kernel Features"

config ARM64_64K_PAGES
	bool "Enable 64KB pages support"
	help
	  This feature enables 64KB pages support (4KB by default)
	  allowing only two levels of page tables and faster TLB
	  look-up. AArch32 emulation is not available when this feature
	  is enabled.

config SMP
	bool "Symmetric Multi-Processing"
	select USE_GENERIC_SMP_HELPERS
	help
	  This enables support for systems with more than one CPU.  If
	  you say N here, the kernel will run on single and
	  multiprocessor machines, but will use only one CPU of a
	  multiprocessor machine. If you say Y here, the kernel will run
	  on many, but not all, single processor machines. On a single
	  processor machine, the kernel will run faster if you say N
	  here.

	  If you don't know what to do here, say N.

config NR_CPUS
	int "Maximum number of CPUs (2-32)"
	range 2 32
	depends on SMP
	default "4"

config SWP_EMULATE
	bool "Emulate SWP/SWPB instructions"
	help
	  ARMv6 architecture deprecates use of the SWP/SWPB instructions. ARMv8
	  oblosetes the use of SWP/SWPB instructions. ARMv7 multiprocessing
	  extensions introduce the ability to disable these instructions,
	  triggering an undefined instruction exception when executed. Say Y
	  here to enable software emulation of these instructions for userspace
	  (not kernel) using LDREX/STREX. Also creates /proc/cpu/swp_emulation
	  for statistics.

	  In some older versions of glibc [<=2.8] SWP is used during futex
	  trylock() operations with the assumption that the code will not
	  be preempted. This invalid assumption may be more likely to fail
	  with SWP emulation enabled, leading to deadlock of the user
	  application.

	  NOTE: when accessing uncached shared regions, LDREX/STREX rely
	  on an external transaction monitoring block called a global
	  monitor to maintain update atomicity. If your system does not
	  implement a global monitor, this option can cause programs that
	  perform SWP operations to uncached memory to deadlock.

	  If unsure, say Y.

source kernel/Kconfig.preempt

config HZ
	int
	default 100

config ARCH_HAS_HOLES_MEMORYMODEL
	def_bool y if SPARSEMEM

config ARCH_SPARSEMEM_ENABLE
	def_bool y
	select SPARSEMEM_VMEMMAP_ENABLE

config ARCH_SPARSEMEM_DEFAULT
	def_bool ARCH_SPARSEMEM_ENABLE

config ARCH_SELECT_MEMORY_MODEL
	def_bool ARCH_SPARSEMEM_ENABLE

config HAVE_ARCH_PFN_VALID
	def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM

config HW_PERF_EVENTS
	bool "Enable hardware performance counter support for perf events"
	depends on PERF_EVENTS
	default y
	help
	  Enable hardware performance counter support for perf events. If
	  disabled, perf events will use software events only.

config ARMV7_COMPAT
	bool "Kernel support for ARMv7 applications"
	depends on COMPAT
	select SWP_EMULATE
	help
	 This option enables features that allow that ran on an ARMv7 or older
	 processor to continue functioning.

	 If you want to execute ARMv7 applications, say Y


source "mm/Kconfig"

config SECCOMP
	bool "Enable seccomp to safely compute untrusted bytecode"
	---help---
	  This kernel feature is useful for number crunching applications
	  that may need to compute untrusted bytecode during their
	  execution. By using pipes or other transports made available to
	  the process as file descriptors supporting the read/write
	  syscalls, it's possible to isolate those applications in
	  their own address space using seccomp. Once seccomp is
	  enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
	  and the task is only allowed to execute a few safe syscalls
	  defined by each seccomp mode.


endmenu

menu "Boot options"

config CMDLINE
	string "Default kernel command string"
	default ""
	help
	  Provide a set of default command-line options at build time by
	  entering them here. As a minimum, you should specify the the
	  root device (e.g. root=/dev/nfs).

choice
	prompt "Kernel command line type" if CMDLINE != ""
	default CMDLINE_FROM_BOOTLOADER

config CMDLINE_FROM_BOOTLOADER
	bool "Use bootloader kernel arguments if available"
	help
	  Uses the command-line options passed by the boot loader. If
	  the boot loader doesn't provide any, the default kernel command
	  string provided in CMDLINE will be used.

config CMDLINE_EXTEND
	bool "Extend bootloader kernel arguments"
	help
	  The command-line arguments provided by the boot loader will be
	  appended to the default kernel command string.

config CMDLINE_FORCE
	bool "Always use the default kernel command string"
	help
	  Always use the default kernel command string, even if the boot
	  loader passes other arguments to the kernel.
	  This is useful if you cannot or don't want to change the
	  command-line options your boot loader passes to the kernel.
endchoice

config BUILD_ARM64_APPENDED_DTB_IMAGE
	bool "Build a concatenated Image.gz/dtb by default"
	depends on OF
	help
	  Enabling this option will cause a concatenated Image.gz and list of
	  DTBs to be built by default (instead of a standalone Image.gz.)
	  The image will built in arch/arm64/boot/Image.gz-dtb

config BUILD_ARM64_APPENDED_DTB_IMAGE_NAMES
	string "Default dtb names"
	depends on BUILD_ARM64_APPENDED_DTB_IMAGE
	help
	  Space separated list of names of dtbs to append when
	  building a concatenated Image.gz-dtb.

endmenu

menu "Userspace binary formats"

source "fs/Kconfig.binfmt"

config COMPAT
	bool "Kernel support for 32-bit EL0"
	depends on !ARM64_64K_PAGES
	select COMPAT_BINFMT_ELF
	select HAVE_UID16
	select OLD_SIGSUSPEND3
	select COMPAT_OLD_SIGACTION
	help
	  This option enables support for a 32-bit EL0 running under a 64-bit
	  kernel at EL1. AArch32-specific components such as system calls,
	  the user helper functions, VFP support and the ptrace interface are
	  handled appropriately by the kernel.

	  If you want to execute 32-bit userspace applications, say Y.

config SYSVIPC_COMPAT
	def_bool y
	depends on COMPAT && SYSVIPC

endmenu

source "net/Kconfig"

source "drivers/Kconfig"

source "fs/Kconfig"

source "arch/arm64/Kconfig.debug"

source "security/Kconfig"

source "crypto/Kconfig"
if CRYPTO
source "arch/arm64/crypto/Kconfig"
endif

source "lib/Kconfig"