arch/arm64/Kconfig - kernel/msm-4.9 - Gitiles

 config ARM64
 	def_bool y
 	select ARCH_BINFMT_ELF_RANDOMIZE_PIE
 	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_SG_CHAIN
 	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
 	select ARCH_USE_CMPXCHG_LOCKREF
 	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 ARM_GIC_V3
 	select BUILDTIME_EXTABLE_SORT
 	select CLONE_BACKWARDS
 	select COMMON_CLK
 	select CPU_PM if (SUSPEND || CPU_IDLE)
 	select DCACHE_WORD_ACCESS
 	select GENERIC_ALLOCATOR
 	select GENERIC_CLOCKEVENTS
 	select GENERIC_CLOCKEVENTS_BROADCAST if SMP
 	select GENERIC_CPU_AUTOPROBE
 	select GENERIC_EARLY_IOREMAP
 	select GENERIC_IRQ_PROBE
 	select GENERIC_IRQ_SHOW
 	select GENERIC_PCI_IOMAP
 	select GENERIC_SCHED_CLOCK
 	select GENERIC_SMP_IDLE_THREAD
 	select GENERIC_STRNCPY_FROM_USER
 	select GENERIC_STRNLEN_USER
 	select GENERIC_TIME_VSYSCALL
 	select HANDLE_DOMAIN_IRQ
 	select HARDIRQS_SW_RESEND
 	select HAVE_ALIGNED_STRUCT_PAGE if SLUB
 	select HAVE_ARCH_AUDITSYSCALL
 	select HAVE_ARCH_JUMP_LABEL
 	select HAVE_ARCH_KGDB
 	select HAVE_ARCH_SECCOMP_FILTER
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_BPF_JIT
 	select HAVE_C_RECORDMCOUNT
 	select HAVE_CC_STACKPROTECTOR
 	select HAVE_CMPXCHG_DOUBLE
 	select HAVE_DEBUG_BUGVERBOSE
 	select HAVE_DEBUG_KMEMLEAK
 	select HAVE_DMA_API_DEBUG
 	select HAVE_DMA_ATTRS
 	select HAVE_DMA_CONTIGUOUS
 	select HAVE_DYNAMIC_FTRACE
 	select HAVE_EFFICIENT_UNALIGNED_ACCESS
 	select HAVE_FTRACE_MCOUNT_RECORD
 	select HAVE_FUNCTION_TRACER
 	select HAVE_FUNCTION_GRAPH_TRACER
 	select HAVE_GENERIC_DMA_COHERENT
 	select HAVE_HW_BREAKPOINT if PERF_EVENTS
 	select HAVE_MEMBLOCK
 	select HAVE_PATA_PLATFORM
 	select HAVE_PERF_EVENTS
 	select HAVE_PERF_REGS
 	select HAVE_PERF_USER_STACK_DUMP
 	select HAVE_RCU_TABLE_FREE
 	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
 	select HAVE_CONTEXT_TRACKING
 	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_MAP
 	def_bool y if !PCI

 config STACKTRACE_SUPPORT
 	def_bool y

 config LOCKDEP_SUPPORT
 	def_bool y

 config TRACE_IRQFLAGS_SUPPORT
 	def_bool y

 config RWSEM_XCHGADD_ALGORITHM
 	def_bool y

 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 HAVE_GENERIC_RCU_GUP
 	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 KERNEL_MODE_NEON
 	def_bool y

 config FIX_EARLYCON_MEM
 	def_bool y

 source "init/Kconfig"

 source "kernel/Kconfig.freezer"

 menu "Platform selection"

 config ARCH_SEATTLE
 	bool "AMD Seattle SoC Family"
 	help
 	  This enables support for AMD Seattle SOC Family

 config ARCH_THUNDER
 	bool "Cavium Inc. Thunder SoC Family"
 	help
 	  This enables support for Cavium's Thunder Family of SoCs.

 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_XGENE
 	bool "AppliedMicro X-Gene SOC Family"
 	help
 	  This enables support for AppliedMicro X-Gene SOC Family

 endmenu

 menu "Bus support"

 config PCI
 	bool "PCI support"
 	help
 	  This feature enables support for PCI bus system. If you say Y
 	  here, the kernel will include drivers and infrastructure code
 	  to support PCI bus devices.

 config PCI_DOMAINS
 	def_bool PCI

 config PCI_DOMAINS_GENERIC
 	def_bool PCI

 config PCI_SYSCALL
 	def_bool PCI

 source "drivers/pci/Kconfig"
 source "drivers/pci/pcie/Kconfig"
 source "drivers/pci/hotplug/Kconfig"

 endmenu

 menu "Kernel Features"

 menu "ARM errata workarounds via the alternatives framework"

 config ARM64_ERRATUM_826319
 	bool "Cortex-A53: 826319: System might deadlock if a write cannot complete until read data is accepted"
 	default y
 	help
 	  This option adds an alternative code sequence to work around ARM
 	  erratum 826319 on Cortex-A53 parts up to r0p2 with an AMBA 4 ACE or
 	  AXI master interface and an L2 cache.

 	  If a Cortex-A53 uses an AMBA AXI4 ACE interface to other processors
 	  and is unable to accept a certain write via this interface, it will
 	  not progress on read data presented on the read data channel and the
 	  system can deadlock.

 	  The workaround promotes data cache clean instructions to
 	  data cache clean-and-invalidate.
 	  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 ARM64_ERRATUM_827319
 	bool "Cortex-A53: 827319: Data cache clean instructions might cause overlapping transactions to the interconnect"
 	default y
 	help
 	  This option adds an alternative code sequence to work around ARM
 	  erratum 827319 on Cortex-A53 parts up to r0p2 with an AMBA 5 CHI
 	  master interface and an L2 cache.

 	  Under certain conditions this erratum can cause a clean line eviction
 	  to occur at the same time as another transaction to the same address
 	  on the AMBA 5 CHI interface, which can cause data corruption if the
 	  interconnect reorders the two transactions.

 	  The workaround promotes data cache clean instructions to
 	  data cache clean-and-invalidate.
 	  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 ARM64_ERRATUM_824069
 	bool "Cortex-A53: 824069: Cache line might not be marked as clean after a CleanShared snoop"
 	default y
 	help
 	  This option adds an alternative code sequence to work around ARM
 	  erratum 824069 on Cortex-A53 parts up to r0p2 when it is connected
 	  to a coherent interconnect.

 	  If a Cortex-A53 processor is executing a store or prefetch for
 	  write 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.

 	  The workaround promotes data cache clean instructions to
 	  data cache clean-and-invalidate.
 	  Please note that this option 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 ARM64_ERRATUM_819472
 	bool "Cortex-A53: 819472: Store exclusive instructions might cause data corruption"
 	default y
 	help
 	  This option adds an alternative code sequence to work around ARM
 	  erratum 819472 on Cortex-A53 parts up to r0p1 with an L2 cache
 	  present when it is connected to a coherent interconnect.

 	  If the processor is executing a load and store exclusive sequence 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 data corruption.

 	  The workaround promotes data cache clean instructions to
 	  data cache clean-and-invalidate.
 	  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 ARM64_ERRATUM_832075
 	bool "Cortex-A57: 832075: possible deadlock on mixing exclusive memory accesses with device loads"
 	default y
 	help
 	  This option adds an alternative code sequence to work around ARM
 	  erratum 832075 on Cortex-A57 parts up to r1p2.

 	  Affected Cortex-A57 parts might deadlock when exclusive load/store
 	  instructions to Write-Back memory are mixed with Device loads.

 	  The workaround is to promote device loads to use Load-Acquire
 	  semantics.
 	  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.

 endmenu


 choice
 	prompt "Page size"
 	default ARM64_4K_PAGES
 	help
 	  Page size (translation granule) configuration.

 config ARM64_4K_PAGES
 	bool "4KB"
 	help
 	  This feature enables 4KB pages support.

 config ARM64_64K_PAGES
 	bool "64KB"
 	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.

 endchoice

 choice
 	prompt "Virtual address space size"
 	default ARM64_VA_BITS_39 if ARM64_4K_PAGES
 	default ARM64_VA_BITS_42 if ARM64_64K_PAGES
 	help
 	  Allows choosing one of multiple possible virtual address
 	  space sizes. The level of translation table is determined by
 	  a combination of page size and virtual address space size.

 config ARM64_VA_BITS_39
 	bool "39-bit"
 	depends on ARM64_4K_PAGES

 config ARM64_VA_BITS_42
 	bool "42-bit"
 	depends on ARM64_64K_PAGES

 config ARM64_VA_BITS_48
 	bool "48-bit"
 	depends on !ARM_SMMU

 endchoice

 config ARM64_VA_BITS
 	int
 	default 39 if ARM64_VA_BITS_39
 	default 42 if ARM64_VA_BITS_42
 	default 48 if ARM64_VA_BITS_48

 config ARM64_PGTABLE_LEVELS
 	int
 	default 2 if ARM64_64K_PAGES && ARM64_VA_BITS_42
 	default 3 if ARM64_64K_PAGES && ARM64_VA_BITS_48
 	default 3 if ARM64_4K_PAGES && ARM64_VA_BITS_39
 	default 4 if ARM64_4K_PAGES && ARM64_VA_BITS_48

 config CPU_BIG_ENDIAN
        bool "Build big-endian kernel"
        help
          Say Y if you plan on running a kernel in big-endian mode.

 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 SCHED_MC
 	bool "Multi-core scheduler support"
 	depends on SMP
 	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 SMP
 	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 NR_CPUS
 	int "Maximum number of CPUs (2-64)"
 	range 2 64
 	depends on SMP
 	# These have to remain sorted largest to smallest
 	default "64"

 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

 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 SYS_SUPPORTS_HUGETLBFS
 	def_bool y

 config ARCH_WANT_GENERAL_HUGETLB
 	def_bool y

 config ARCH_WANT_HUGE_PMD_SHARE
 	def_bool y if !ARM64_64K_PAGES

 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
 	def_bool y

 config ARCH_HAS_CACHE_LINE_SIZE
 	def_bool 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.

 config XEN_DOM0
 	def_bool y
 	depends on XEN

 config XEN
 	bool "Xen guest support on ARM64"
 	depends on ARM64 && OF
 	select SWIOTLB_XEN
 	help
 	  Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64.

 config FORCE_MAX_ZONEORDER
 	int
 	default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
 	default "11"

 menuconfig ARMV8_DEPRECATED
 	bool "Emulate deprecated/obsolete ARMv8 instructions"
 	depends on COMPAT
 	help
 	  Legacy software support may require certain instructions
 	  that have been deprecated or obsoleted in the architecture.

 	  Enable this config to enable selective emulation of these
 	  features.

 	  If unsure, say Y

 if ARMV8_DEPRECATED

 config SWP_EMULATION
 	bool "Emulate SWP/SWPB instructions"
 	help
 	  ARMv8 obsoletes the use of A32 SWP/SWPB instructions such that
 	  they are always undefined. Say Y here to enable software
 	  emulation of these instructions for userspace using LDXR/STXR.

 	  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, LDXR/STXR 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 CP15_BARRIER_EMULATION
 	bool "Emulate CP15 Barrier instructions"
 	help
 	  The CP15 barrier instructions - CP15ISB, CP15DSB, and
 	  CP15DMB - are deprecated in ARMv8 (and ARMv7). It is
 	  strongly recommended to use the ISB, DSB, and DMB
 	  instructions instead.

 	  Say Y here to enable software emulation of these
 	  instructions for AArch32 userspace code. When this option is
 	  enabled, CP15 barrier usage is traced which can help
 	  identify software that needs updating.

 	  If unsure, say Y

 endif

 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).

 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.

 config EFI_STUB
 	bool

 config EFI
 	bool "UEFI runtime support"
 	depends on OF && !CPU_BIG_ENDIAN
 	select LIBFDT
 	select UCS2_STRING
 	select EFI_PARAMS_FROM_FDT
 	select EFI_RUNTIME_WRAPPERS
 	select EFI_STUB
 	select EFI_ARMSTUB
 	default y
 	help
 	  This option provides support for runtime services provided
 	  by UEFI firmware (such as non-volatile variables, realtime
           clock, and platform reset). A UEFI stub is also provided to
 	  allow the kernel to be booted as an EFI application. This
 	  is only useful on systems that have UEFI firmware.

 config DMI
 	bool "Enable support for SMBIOS (DMI) tables"
 	depends on EFI
 	default y
 	help
 	  This enables SMBIOS/DMI feature for systems.

 	  This option is only useful on systems that have UEFI firmware.
 	  However, even with this option, the resultant kernel should
 	  continue to boot on existing non-UEFI platforms.

 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
 	def_bool y

 config ARM64_CPU_SUSPEND
 	def_bool PM_SLEEP

 endmenu

 menu "CPU Power Management"

 source "drivers/cpuidle/Kconfig"

 source "drivers/cpufreq/Kconfig"

 endmenu

 source "net/Kconfig"

 source "drivers/Kconfig"

 source "drivers/firmware/Kconfig"

 source "fs/Kconfig"

 source "arch/arm64/kvm/Kconfig"

 source "arch/arm64/Kconfig.debug"

 source "security/Kconfig"

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

 source "lib/Kconfig"
	config ARM64
	def_bool y
	select ARCH_BINFMT_ELF_RANDOMIZE_PIE
	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
	select ARCH_HAS_GCOV_PROFILE_ALL
	select ARCH_HAS_SG_CHAIN
	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
	select ARCH_USE_CMPXCHG_LOCKREF
	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 ARM_GIC_V3
	select BUILDTIME_EXTABLE_SORT
	select CLONE_BACKWARDS
	select COMMON_CLK
	select CPU_PM if (SUSPEND \|\| CPU_IDLE)
	select DCACHE_WORD_ACCESS
	select GENERIC_ALLOCATOR
	select GENERIC_CLOCKEVENTS
	select GENERIC_CLOCKEVENTS_BROADCAST if SMP
	select GENERIC_CPU_AUTOPROBE
	select GENERIC_EARLY_IOREMAP
	select GENERIC_IRQ_PROBE
	select GENERIC_IRQ_SHOW
	select GENERIC_PCI_IOMAP
	select GENERIC_SCHED_CLOCK
	select GENERIC_SMP_IDLE_THREAD
	select GENERIC_STRNCPY_FROM_USER
	select GENERIC_STRNLEN_USER
	select GENERIC_TIME_VSYSCALL
	select HANDLE_DOMAIN_IRQ
	select HARDIRQS_SW_RESEND
	select HAVE_ALIGNED_STRUCT_PAGE if SLUB
	select HAVE_ARCH_AUDITSYSCALL
	select HAVE_ARCH_JUMP_LABEL
	select HAVE_ARCH_KGDB
	select HAVE_ARCH_SECCOMP_FILTER
	select HAVE_ARCH_TRACEHOOK
	select HAVE_BPF_JIT
	select HAVE_C_RECORDMCOUNT
	select HAVE_CC_STACKPROTECTOR
	select HAVE_CMPXCHG_DOUBLE
	select HAVE_DEBUG_BUGVERBOSE
	select HAVE_DEBUG_KMEMLEAK
	select HAVE_DMA_API_DEBUG
	select HAVE_DMA_ATTRS
	select HAVE_DMA_CONTIGUOUS
	select HAVE_DYNAMIC_FTRACE
	select HAVE_EFFICIENT_UNALIGNED_ACCESS
	select HAVE_FTRACE_MCOUNT_RECORD
	select HAVE_FUNCTION_TRACER
	select HAVE_FUNCTION_GRAPH_TRACER
	select HAVE_GENERIC_DMA_COHERENT
	select HAVE_HW_BREAKPOINT if PERF_EVENTS
	select HAVE_MEMBLOCK
	select HAVE_PATA_PLATFORM
	select HAVE_PERF_EVENTS
	select HAVE_PERF_REGS
	select HAVE_PERF_USER_STACK_DUMP
	select HAVE_RCU_TABLE_FREE
	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
	select HAVE_CONTEXT_TRACKING
	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_MAP
	def_bool y if !PCI

	config STACKTRACE_SUPPORT
	def_bool y

	config LOCKDEP_SUPPORT
	def_bool y

	config TRACE_IRQFLAGS_SUPPORT
	def_bool y

	config RWSEM_XCHGADD_ALGORITHM
	def_bool y

	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 HAVE_GENERIC_RCU_GUP
	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 KERNEL_MODE_NEON
	def_bool y

	config FIX_EARLYCON_MEM
	def_bool y

	source "init/Kconfig"

	source "kernel/Kconfig.freezer"

	menu "Platform selection"

	config ARCH_SEATTLE
	bool "AMD Seattle SoC Family"
	help
	This enables support for AMD Seattle SOC Family

	config ARCH_THUNDER
	bool "Cavium Inc. Thunder SoC Family"
	help
	This enables support for Cavium's Thunder Family of SoCs.

	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_XGENE
	bool "AppliedMicro X-Gene SOC Family"
	help
	This enables support for AppliedMicro X-Gene SOC Family

	endmenu

	menu "Bus support"

	config PCI
	bool "PCI support"
	help
	This feature enables support for PCI bus system. If you say Y
	here, the kernel will include drivers and infrastructure code
	to support PCI bus devices.

	config PCI_DOMAINS
	def_bool PCI

	config PCI_DOMAINS_GENERIC
	def_bool PCI

	config PCI_SYSCALL
	def_bool PCI

	source "drivers/pci/Kconfig"
	source "drivers/pci/pcie/Kconfig"
	source "drivers/pci/hotplug/Kconfig"

	endmenu

	menu "Kernel Features"

	menu "ARM errata workarounds via the alternatives framework"

	config ARM64_ERRATUM_826319
	bool "Cortex-A53: 826319: System might deadlock if a write cannot complete until read data is accepted"
	default y
	help
	This option adds an alternative code sequence to work around ARM
	erratum 826319 on Cortex-A53 parts up to r0p2 with an AMBA 4 ACE or
	AXI master interface and an L2 cache.

	If a Cortex-A53 uses an AMBA AXI4 ACE interface to other processors
	and is unable to accept a certain write via this interface, it will
	not progress on read data presented on the read data channel and the
	system can deadlock.

	The workaround promotes data cache clean instructions to
	data cache clean-and-invalidate.
	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 ARM64_ERRATUM_827319
	bool "Cortex-A53: 827319: Data cache clean instructions might cause overlapping transactions to the interconnect"
	default y
	help
	This option adds an alternative code sequence to work around ARM
	erratum 827319 on Cortex-A53 parts up to r0p2 with an AMBA 5 CHI
	master interface and an L2 cache.

	Under certain conditions this erratum can cause a clean line eviction
	to occur at the same time as another transaction to the same address
	on the AMBA 5 CHI interface, which can cause data corruption if the
	interconnect reorders the two transactions.

	The workaround promotes data cache clean instructions to
	data cache clean-and-invalidate.
	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 ARM64_ERRATUM_824069
	bool "Cortex-A53: 824069: Cache line might not be marked as clean after a CleanShared snoop"
	default y
	help
	This option adds an alternative code sequence to work around ARM
	erratum 824069 on Cortex-A53 parts up to r0p2 when it is connected
	to a coherent interconnect.

	If a Cortex-A53 processor is executing a store or prefetch for
	write 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.

	The workaround promotes data cache clean instructions to
	data cache clean-and-invalidate.
	Please note that this option 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 ARM64_ERRATUM_819472
	bool "Cortex-A53: 819472: Store exclusive instructions might cause data corruption"
	default y
	help
	This option adds an alternative code sequence to work around ARM
	erratum 819472 on Cortex-A53 parts up to r0p1 with an L2 cache
	present when it is connected to a coherent interconnect.

	If the processor is executing a load and store exclusive sequence 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 data corruption.

	The workaround promotes data cache clean instructions to
	data cache clean-and-invalidate.
	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 ARM64_ERRATUM_832075
	bool "Cortex-A57: 832075: possible deadlock on mixing exclusive memory accesses with device loads"
	default y
	help
	This option adds an alternative code sequence to work around ARM
	erratum 832075 on Cortex-A57 parts up to r1p2.

	Affected Cortex-A57 parts might deadlock when exclusive load/store
	instructions to Write-Back memory are mixed with Device loads.

	The workaround is to promote device loads to use Load-Acquire
	semantics.
	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.

	endmenu


	choice
	prompt "Page size"
	default ARM64_4K_PAGES
	help
	Page size (translation granule) configuration.

	config ARM64_4K_PAGES
	bool "4KB"
	help
	This feature enables 4KB pages support.

	config ARM64_64K_PAGES
	bool "64KB"
	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.

	endchoice

	choice
	prompt "Virtual address space size"
	default ARM64_VA_BITS_39 if ARM64_4K_PAGES
	default ARM64_VA_BITS_42 if ARM64_64K_PAGES
	help
	Allows choosing one of multiple possible virtual address
	space sizes. The level of translation table is determined by
	a combination of page size and virtual address space size.

	config ARM64_VA_BITS_39
	bool "39-bit"
	depends on ARM64_4K_PAGES

	config ARM64_VA_BITS_42
	bool "42-bit"
	depends on ARM64_64K_PAGES

	config ARM64_VA_BITS_48
	bool "48-bit"
	depends on !ARM_SMMU

	endchoice

	config ARM64_VA_BITS
	int
	default 39 if ARM64_VA_BITS_39
	default 42 if ARM64_VA_BITS_42
	default 48 if ARM64_VA_BITS_48

	config ARM64_PGTABLE_LEVELS
	int
	default 2 if ARM64_64K_PAGES && ARM64_VA_BITS_42
	default 3 if ARM64_64K_PAGES && ARM64_VA_BITS_48
	default 3 if ARM64_4K_PAGES && ARM64_VA_BITS_39
	default 4 if ARM64_4K_PAGES && ARM64_VA_BITS_48

	config CPU_BIG_ENDIAN
	bool "Build big-endian kernel"
	help
	Say Y if you plan on running a kernel in big-endian mode.

	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 SCHED_MC
	bool "Multi-core scheduler support"
	depends on SMP
	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 SMP
	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 NR_CPUS
	int "Maximum number of CPUs (2-64)"
	range 2 64
	depends on SMP
	# These have to remain sorted largest to smallest
	default "64"

	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

	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 SYS_SUPPORTS_HUGETLBFS
	def_bool y

	config ARCH_WANT_GENERAL_HUGETLB
	def_bool y

	config ARCH_WANT_HUGE_PMD_SHARE
	def_bool y if !ARM64_64K_PAGES

	config HAVE_ARCH_TRANSPARENT_HUGEPAGE
	def_bool y

	config ARCH_HAS_CACHE_LINE_SIZE
	def_bool 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.

	config XEN_DOM0
	def_bool y
	depends on XEN

	config XEN
	bool "Xen guest support on ARM64"
	depends on ARM64 && OF
	select SWIOTLB_XEN
	help
	Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64.

	config FORCE_MAX_ZONEORDER
	int
	default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
	default "11"

	menuconfig ARMV8_DEPRECATED
	bool "Emulate deprecated/obsolete ARMv8 instructions"
	depends on COMPAT
	help
	Legacy software support may require certain instructions
	that have been deprecated or obsoleted in the architecture.

	Enable this config to enable selective emulation of these
	features.

	If unsure, say Y

	if ARMV8_DEPRECATED

	config SWP_EMULATION
	bool "Emulate SWP/SWPB instructions"
	help
	ARMv8 obsoletes the use of A32 SWP/SWPB instructions such that
	they are always undefined. Say Y here to enable software
	emulation of these instructions for userspace using LDXR/STXR.

	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, LDXR/STXR 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 CP15_BARRIER_EMULATION
	bool "Emulate CP15 Barrier instructions"
	help
	The CP15 barrier instructions - CP15ISB, CP15DSB, and
	CP15DMB - are deprecated in ARMv8 (and ARMv7). It is
	strongly recommended to use the ISB, DSB, and DMB
	instructions instead.

	Say Y here to enable software emulation of these
	instructions for AArch32 userspace code. When this option is
	enabled, CP15 barrier usage is traced which can help
	identify software that needs updating.

	If unsure, say Y

	endif

	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).

	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.

	config EFI_STUB
	bool

	config EFI
	bool "UEFI runtime support"
	depends on OF && !CPU_BIG_ENDIAN
	select LIBFDT
	select UCS2_STRING
	select EFI_PARAMS_FROM_FDT
	select EFI_RUNTIME_WRAPPERS
	select EFI_STUB
	select EFI_ARMSTUB
	default y
	help
	This option provides support for runtime services provided
	by UEFI firmware (such as non-volatile variables, realtime
	clock, and platform reset). A UEFI stub is also provided to
	allow the kernel to be booted as an EFI application. This
	is only useful on systems that have UEFI firmware.

	config DMI
	bool "Enable support for SMBIOS (DMI) tables"
	depends on EFI
	default y
	help
	This enables SMBIOS/DMI feature for systems.

	This option is only useful on systems that have UEFI firmware.
	However, even with this option, the resultant kernel should
	continue to boot on existing non-UEFI platforms.

	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
	def_bool y

	config ARM64_CPU_SUSPEND
	def_bool PM_SLEEP

	endmenu

	menu "CPU Power Management"

	source "drivers/cpuidle/Kconfig"

	source "drivers/cpufreq/Kconfig"

	endmenu

	source "net/Kconfig"

	source "drivers/Kconfig"

	source "drivers/firmware/Kconfig"

	source "fs/Kconfig"

	source "arch/arm64/kvm/Kconfig"

	source "arch/arm64/Kconfig.debug"

	source "security/Kconfig"

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

	source "lib/Kconfig"