path: root/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 ARM_HAS_SG_CHAIN
	select ARCH_WANT_FRAME_POINTERS
	select ARM_AMBA
	select ARM_ARCH_TIMER
	select AUDIT_ARCH_COMPAT_GENERIC
	select CLONE_BACKWARDS
	select COMMON_CLK
        select ARM_GIC
	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_JUMP_LABEL
	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_KGDB
	select HAVE_ARCH_TRACEHOOK
	select HAVE_C_RECORDMCOUNT
	select HAVE_CC_STACKPROTECTOR
	select HAVE_DEBUG_BUGVERBOSE
	select HAVE_DEBUG_KMEMLEAK
	select HAVE_DMA_ATTRS
	select HAVE_DMA_CONTIGUOUS
	select HAVE_DYNAMIC_FTRACE
	select HAVE_FTRACE_MCOUNT_RECORD
	select HAVE_FUNCTION_TRACER
	select HAVE_FUNCTION_GRAPH_TRACER
	select HAVE_GENERIC_DMA_COHERENT
	select HAVE_GENERIC_HARDIRQS
	select HAVE_HW_BREAKPOINT if PERF_EVENTS
	select HAVE_MEMBLOCK
	select HAVE_PERF_EVENTS
	select HAVE_SYSCALL_TRACEPOINTS
	select IRQ_DOMAIN
	select MODULES_USE_ELF_RELA
	select NO_BOOTMEM
	select OF
	select OF_EARLY_FLATTREE
	select OF_RESERVED_MEM
	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 ARM_HAS_SG_CHAIN
	def_bool y

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 STACKTRACE_SUPPORT
	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 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 ARCH_HAS_CPUFREQ
	bool
	help
	  Internal node to signify that the ARCH has CPUFREQ support
	  and that the relevant menu configurations are displayed for
	  it.

config GENERIC_HWEIGHT
	def_bool y

config GENERIC_CSUM
        def_bool y

config GENERIC_CALIBRATE_DELAY
	def_bool y

config ZONE_DMA
	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

config ARM_ERRATA_824069
	bool "ARM errata: Cache line might not be marked as clean after a CleanShared snoop"
	depends on SMP
	help
	  This option enables the workaround for erratum 824069
	  affecting Cortex-A53 MPCore with two or more processors (r0p0..r0p2).
	  If a Cortex-A53 processor is executing a store or PLDW instruction at the same time
	  as a processor in another cluster is executing a cache maintenance operation
	  to the same address, then this erratum might cause a clean cache line to be
	  incorrectly marked as dirty. This workaround replaces all cache clean opeartion
	  to clean & invalidate.

config ARM64_ERRATUM_845719
	bool "Cortex-A53: 845719: a load might read incorrect data"
	depends on COMPAT
	default y
	help
	  This option enables the workaround for erratum 845719.
	  When running a compat (AArch32) userspace on an affected Cortex-A53
	  part, a load at EL0 from a virtual address that matches the bottom 32
	  bits of the virtual address used by a recent load at (AArch64) EL1
	  might return incorrect data.

	  The workaround is to write the contextidr_el1 register on exception
	  return to a 32-bit task.
	  Please note that this does not necessarily enable the workaround,
	  as it depends on the alternative framework, which will only patch
	  the kernel if an affected CPU is detected.

	  If unsure, say Y.

config KERNEL_MODE_NEON
	def_bool y

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).

config ARCH_MT6735
	bool "MediaTek MT6735"
	select GENERIC_TIME
	select GENERIC_CLOCKEVENTS
	select ARCH_HAS_CPUFREQ
	select ARM_AMBA
	select CPU_V7
	select HAVE_SMP
	select NEED_MACH_MEMORY_H
	select IRQ_DOMAIN
	select GENERIC_SCHED_CLOCK
	select MTK_SYSTRACKER
	select MTK_SYS_CIRQ
	select MTK_EIC
	select ARMV7_COMPAT
        select ARMV7_COMPAT_CPUINFO
	select ARM64_ERRATUM_845719
	help
	  This enable support for MediaTek MT6735

config ARCH_MT6735M
	bool "MediaTek MT6735M"
	select GENERIC_TIME
	select GENERIC_CLOCKEVENTS
	select ARCH_HAS_CPUFREQ
	select ARM_AMBA
	select CPU_V7
	select HAVE_SMP
	select NEED_MACH_MEMORY_H
	select IRQ_DOMAIN
	select GENERIC_SCHED_CLOCK
	select MTK_SYSTRACKER
	select MTK_SYS_CIRQ
	select MTK_EIC
	select ARMV7_COMPAT
        select ARMV7_COMPAT_CPUINFO
	select ARM64_ERRATUM_845719
	help
	  This enable support for MediaTek MT6735M

config ARCH_MT6753
	bool "MediaTek MT6735M"
	select GENERIC_TIME
	select GENERIC_CLOCKEVENTS
	select ARCH_HAS_CPUFREQ
	select ARM_AMBA
	select CPU_V7
	select HAVE_SMP
	select NEED_MACH_MEMORY_H
	select IRQ_DOMAIN
	select GENERIC_SCHED_CLOCK
	select MTK_SYSTRACKER
	select MTK_SYS_CIRQ
	select MTK_EIC
	select ARMV7_COMPAT
        select ARMV7_COMPAT_CPUINFO
	select ARM64_ERRATUM_845719
	help
	  This enable support for MediaTek MT6753

config ARCH_MT6752
	bool "MediaTek MT6752"
	select GENERIC_TIME
	select GENERIC_CLOCKEVENTS
	select ARCH_HAS_CPUFREQ
	select ARM_AMBA
	select CPU_V7
	select HAVE_SMP
	select NEED_MACH_MEMORY_H
	select IRQ_DOMAIN
	select GENERIC_SCHED_CLOCK
	select MTK_SYSTRACKER
	select MTK_L2C_SHARE
	select ARCH_REQUIRE_GPIOLIB
	select MTK_ETM
	select MTK_EIC
	select ARMV7_COMPAT
        select ARMV7_COMPAT_CPUINFO
	select ARM_ERRATA_824069
	help
	  This enable support for MediaTek MT6752

config ARCH_MT8163
	bool "MediaTek MT8163"
	select GENERIC_TIME
	select GENERIC_CLOCKEVENTS
	select ARCH_HAS_CPUFREQ
	select ARM_AMBA
	select CPU_V7
	select HAVE_SMP
	select NEED_MACH_MEMORY_H
	select IRQ_DOMAIN
	select IRQ_DOMAIN_DEBUG
	select GENERIC_SCHED_CLOCK
	select MTK_SYSTRACKER
	select MTK_L2C_SHARE
	select ARCH_REQUIRE_GPIOLIB
	select MTK_ETM
	select MTK_EIC
	select ARMV7_COMPAT
        select ARMV7_COMPAT_CPUINFO
	select ARM_ERRATA_824069
	help
	  This enable support for MediaTek MT8163

config ARCH_MT6795
	bool "MediaTek MT6795"
	select GENERIC_TIME
	select GENERIC_CLOCKEVENTS
	select ARCH_HAS_CPUFREQ
	select ARM_AMBA
	select CPU_V7
	select HAVE_SMP
	select NEED_MACH_MEMORY_H
	select FIQ_GLUE
	select IRQ_DOMAIN
	select GENERIC_SCHED_CLOCK
	select ARCH_REQUIRE_GPIOLIB
	select MTK_SYS_CIRQ
	select MTK_CPU_STRESS
	select MTK_SYSTRACKER
	select MTK_LASTPC
	select MTK_EIC
	select MTK_ETM
	select ARMV7_COMPAT
        select ARMV7_COMPAT_CPUINFO
        select MD32_SUPPORT
	select ARM_ERRATA_824069
	help
	  This enable support for MediaTek MT6795
endmenu

source "drivers/misc/mediatek/mach/Kconfig"

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"
	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 ARM_CPU_TOPOLOGY
	bool "Support CPU topology definition"
	depends on SMP
	default y
	help
	  Support CPU topology definition, based on configuration
	  provided by the firmware.

config SCHED_MC
	bool "Multi-core scheduler support"
	depends on ARM_CPU_TOPOLOGY
	help
	  Multi-core scheduler support improves the CPU scheduler's decision
	  making when dealing with multi-core CPU chips at a cost of slightly
	  increased overhead in some places. If unsure say N here.

config SCHED_SMT
	bool "SMT scheduler support"
	depends on ARM_CPU_TOPOLOGY
	help
	  Improves the CPU scheduler's decision making when dealing with
	  MultiThreading at a cost of slightly increased overhead in some
	  places. If unsure say N here.

config DISABLE_CPU_SCHED_DOMAIN_BALANCE
	bool "(EXPERIMENTAL) Disable CPU level scheduler load-balancing"
	help
	  Disables scheduler load-balancing at CPU sched domain level.

config SCHED_HMP
	bool "(EXPERIMENTAL) Heterogenous multiprocessor scheduling"
	depends on DISABLE_CPU_SCHED_DOMAIN_BALANCE && SCHED_MC && FAIR_GROUP_SCHED && !SCHED_AUTOGROUP
	help
	  Experimental scheduler optimizations for heterogeneous platforms.
	  Attempts to introspectively select task affinity to optimize power
	  and performance. Basic support for multiple (>2) cpu types is in place,
	  but it has only been tested with two types of cpus.
	  There is currently no support for migration of task groups, hence
	  !SCHED_AUTOGROUP. Furthermore, normal load-balancing must be disabled
	  between cpus of different type (DISABLE_CPU_SCHED_DOMAIN_BALANCE).

config SCHED_HMP_PRIO_FILTER
	bool "(EXPERIMENTAL) Filter HMP migrations by task priority"
	depends on SCHED_HMP
	help
	  Enables task priority based HMP migration filter. Any task with
	  a NICE value above the threshold will always be on low-power cpus
	  with less compute capacity.

config SCHED_HMP_PRIO_FILTER_VAL
	int "NICE priority threshold"
	default 5
	depends on SCHED_HMP_PRIO_FILTER

config HMP_FAST_CPU_MASK
	string "HMP scheduler fast CPU mask"
	depends on SCHED_HMP
	help
          Leave empty to use device tree information.
	  Specify the cpuids of the fast CPUs in the system as a list string,
	  e.g. cpuid 0+1 should be specified as 0-1.

config HMP_SLOW_CPU_MASK
	string "HMP scheduler slow CPU mask"
	depends on SCHED_HMP
	help
	  Leave empty to use device tree information.
	  Specify the cpuids of the slow CPUs in the system as a list string,
	  e.g. cpuid 0+1 should be specified as 0-1.

config HMP_VARIABLE_SCALE
	bool "Allows changing the load tracking scale through sysfs"
	depends on SCHED_HMP
	help
	  When turned on, this option exports the thresholds and load average
	  period value for the load tracking patches through sysfs.
	  The values can be modified to change the rate of load accumulation
	  and the thresholds used for HMP migration.
	  The load_avg_period_ms is the time in ms to reach a load average of
	  0.5 for an idle task of 0 load average ratio that start a busy loop.
	  The up_threshold and down_threshold is the value to go to a faster
	  CPU or to go back to a slower cpu.
	  The {up,down}_threshold are devided by 1024 before being compared
	  to the load average.
	  For examples, with load_avg_period_ms = 128 and up_threshold = 512,
	  a running task with a load of 0 will be migrated to a bigger CPU after
	  128ms, because after 128ms its load_avg_ratio is 0.5 and the real
	  up_threshold is 0.5.
	  This patch has the same behavior as changing the Y of the load
	  average computation to
	        (1002/1024)^(LOAD_AVG_PERIOD/load_avg_period_ms)
	  but it remove intermadiate overflows in computation.

config MET_SCHED_HMP
	bool "(EXPERIMENTAL) MET SCHED HMP Info"
	depends on SCHED_HMP_ENHANCEMENT
	depends on HMP_TRACER
	help
	  MET SCHED HMP Info

config HMP_FREQUENCY_INVARIANT_SCALE
	bool "(EXPERIMENTAL) Frequency-Invariant Tracked Load for HMP"
	depends on HMP_VARIABLE_SCALE && CPU_FREQ
	depends on !ARCH_SCALE_INVARIANT_CPU_CAPACITY
	help
	  Scales the current load contribution in line with the frequency
	  of the CPU that the task was executed on.
	  In this version, we use a simple linear scale derived from the
	  maximum frequency reported by CPUFreq.
	  Restricting tracked load to be scaled by the CPU's frequency
	  represents the consumption of possible compute capacity
	  (rather than consumption of actual instantaneous capacity as
	  normal) and allows the HMP migration's simple threshold
	  migration strategy to interact more predictably with CPUFreq's
	  asynchronous compute capacity changes.

config SCHED_HMP_ENHANCEMENT
	bool "(EXPERIMENTAL) HMP Ennhancement"
	depends on SCHED_HMP
	help
	  HMP Ennhancement

config HMP_TRACER
	bool "(EXPERIMENTAL) Profile HMP scheduler"
	depends on SCHED_HMP_ENHANCEMENT
	help
	  Profile HMP scheduler

config HMP_DYNAMIC_THRESHOLD
	bool "(EXPERIMENTAL) Dynamically adjust task migration threshold"
	depends on SCHED_HMP_ENHANCEMENT
	help
	  Dynamically adjust task migration threshold according to current system load

config HMP_GLOBAL_BALANCE
	bool "(EXPERIMENTAL) Enhance HMP global load balance"
	depends on SCHED_HMP_ENHANCEMENT
	help
	  Enhance HMP global load balance

config HMP_TASK_ASSIGNMENT
	bool "(EXPERIMENTAL) Enhance HMP task assignment"
	depends on SCHED_HMP_ENHANCEMENT
	help
	  Enhance HMP task assignment

config HMP_DISCARD_CFS_SELECTION_RESULT
	bool "(EXPERIMENTAL) Discard CFS runqueue selection result"
	depends on SCHED_HMP_ENHANCEMENT && HMP_TASK_ASSIGNMENT
	help
	  Discard CFS runqueue selection result even if only one cluster exists

config HMP_PACK_SMALL_TASK
	bool "(EXPERIMENTAL) Packing Small Tasks"
	depends on SCHED_HMP_ENHANCEMENT
	help
		This option enables Packing Small Tasks

config HMP_PACK_BUDDY_INFO
	bool "(EXPERIMENTAL) Packing Small Tasks Buddy Information Log"
	depends on SCHED_HMP_ENHANCEMENT && HMP_PACK_SMALL_TASK
	help
		This option enables Packing Small Tasks Buddy Information Log

config HMP_LAZY_BALANCE
	bool "(EXPERIMENTAL) Lazy Balance"
	depends on SCHED_HMP_ENHANCEMENT && HMP_PACK_SMALL_TASK
	help
		This option enables Lazy Balance

config HMP_POWER_AWARE_CONTROLLER
	bool "(EXPERIMENTAL) Power-aware Scheduler for b.L MP Controller"
	depends on SCHED_HMP_ENHANCEMENT && HMP_PACK_SMALL_TASK && HMP_LAZY_BALANCE
	help
		Power-aware scheduler for b.L MP controller and status interface

config HEVTASK_INTERFACE
	bool "task status interface"
	help
	  The option provide an interface to show task status

config ARCH_SCALE_INVARIANT_CPU_CAPACITY
	bool "(EXPERIMENTAL) Scale-Invariant CPU Compute Capacity Recording"
	depends on CPU_FREQ
	help
	    Provides a new measure of maximum and instantaneous CPU compute
	    capacity, derived from a table of relative compute performance
	    for each core type present in the system. The table is an
	    estimate and specific core performance may be different for
	    any particular workload. The measure includes the relative
	    performance and a linear scale of current to maximum frequency
	    such that at maximum frequency (as expressed in the DTB) the
	    reported compute capacity will be equal to the estimated
	    performance from the table. Values range between 0 and 1023 where
	    1023 is the highest capacity available in the system.

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.

config HOTPLUG_CPU
	bool "Support for hot-pluggable CPUs"
	depends on SMP
	help
	  Say Y here to experiment with turning CPUs off and on.  CPUs
	  can be controlled through /sys/devices/system/cpu.

source kernel/Kconfig.preempt

source kernel/Kconfig.hz

config ARCH_HAS_HOLES_MEMORYMODEL
	def_bool y if SPARSEMEM

config ARCH_SPARSEMEM_ENABLE
	def_bool y if !MTK_GMO_RAM_OPTIMIZE
	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

config ARMV7_COMPAT_CPUINFO
	bool "Report backwards compatible cpu features in /proc/cpuinfo"
	depends on ARMV7_COMPAT
	default y
	help
	 This option makes /proc/cpuinfo list CPU features that an ARMv7 or
	 earlier kernel would report, but are not optional on an ARMv8 or later
	 processor.

	 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 "CPU Power Management"

if ARCH_HAS_CPUFREQ
source "drivers/cpufreq/Kconfig"
endif

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

menu "Power management options"

source "kernel/power/Kconfig"

config ARCH_SUSPEND_POSSIBLE
       depends on !ARCH_S5PC100
       depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \
               CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK || ARM64
       def_bool y

config ARM64_CPU_SUSPEND
       def_bool PM_SLEEP

config ARCH_HIBERNATION_POSSIBLE
        bool
        depends on MMU
        default y if ARCH_SUSPEND_POSSIBLE

endmenu

menu "Expermimental Security Enhancements"

config KUSER_HELPERS_SELECTIVE_DISABLE
	bool "Disable KUSER_HELPERS selectively"
	depends on ARM64
	help
	  Kuser_Helpers is a set of functions in the vector page at a fixed address that
	  are used to support applications compiled for legacy ARM <7.  These functions
	  being at a fixed address creates an ASLR bypass.

	  Do not enable this feature unless you know what you are doing, this is
	  experimental, and will break any application that uses the Kuser_Helpers or
	  registers a signal handler and uses the kernel trampolines.

	  If unsure, say N.

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"