[linux-2.6-block.git] / arch / arm64 / Kconfig

config ARM64
	def_bool y
	select ARCH_BINFMT_ELF_RANDOMIZE_PIE
	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
	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_IOMAP
	select GENERIC_IRQ_PROBE
	select GENERIC_IRQ_SHOW
	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_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_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 ARM_AMBA
	bool

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"

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 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"
Commit	Line	Data
	1	config ARM64
	2	def_bool y
	3	select ARCH_BINFMT_ELF_RANDOMIZE_PIE
	4	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
	5	select ARCH_HAS_SG_CHAIN
	6	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
	7	select ARCH_USE_CMPXCHG_LOCKREF
	8	select ARCH_SUPPORTS_ATOMIC_RMW
	9	select ARCH_WANT_OPTIONAL_GPIOLIB
	10	select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
	11	select ARCH_WANT_FRAME_POINTERS
	12	select ARM_AMBA
	13	select ARM_ARCH_TIMER
	14	select ARM_GIC
	15	select AUDIT_ARCH_COMPAT_GENERIC
	16	select ARM_GIC_V3
	17	select BUILDTIME_EXTABLE_SORT
	18	select CLONE_BACKWARDS
	19	select COMMON_CLK
	20	select CPU_PM if (SUSPEND \|\| CPU_IDLE)
	21	select DCACHE_WORD_ACCESS
	22	select GENERIC_ALLOCATOR
	23	select GENERIC_CLOCKEVENTS
	24	select GENERIC_CLOCKEVENTS_BROADCAST if SMP
	25	select GENERIC_CPU_AUTOPROBE
	26	select GENERIC_EARLY_IOREMAP
	27	select GENERIC_IOMAP
	28	select GENERIC_IRQ_PROBE
	29	select GENERIC_IRQ_SHOW
	30	select GENERIC_SCHED_CLOCK
	31	select GENERIC_SMP_IDLE_THREAD
	32	select GENERIC_STRNCPY_FROM_USER
	33	select GENERIC_STRNLEN_USER
	34	select GENERIC_TIME_VSYSCALL
	35	select HANDLE_DOMAIN_IRQ
	36	select HARDIRQS_SW_RESEND
	37	select HAVE_ALIGNED_STRUCT_PAGE if SLUB
	38	select HAVE_ARCH_AUDITSYSCALL
	39	select HAVE_ARCH_JUMP_LABEL
	40	select HAVE_ARCH_KGDB
	41	select HAVE_ARCH_TRACEHOOK
	42	select HAVE_BPF_JIT
	43	select HAVE_C_RECORDMCOUNT
	44	select HAVE_CC_STACKPROTECTOR
	45	select HAVE_CMPXCHG_DOUBLE
	46	select HAVE_DEBUG_BUGVERBOSE
	47	select HAVE_DEBUG_KMEMLEAK
	48	select HAVE_DMA_API_DEBUG
	49	select HAVE_DMA_ATTRS
	50	select HAVE_DMA_CONTIGUOUS
	51	select HAVE_DYNAMIC_FTRACE
	52	select HAVE_EFFICIENT_UNALIGNED_ACCESS
	53	select HAVE_FTRACE_MCOUNT_RECORD
	54	select HAVE_FUNCTION_TRACER
	55	select HAVE_FUNCTION_GRAPH_TRACER
	56	select HAVE_GENERIC_DMA_COHERENT
	57	select HAVE_HW_BREAKPOINT if PERF_EVENTS
	58	select HAVE_MEMBLOCK
	59	select HAVE_PATA_PLATFORM
	60	select HAVE_PERF_EVENTS
	61	select HAVE_PERF_REGS
	62	select HAVE_PERF_USER_STACK_DUMP
	63	select HAVE_RCU_TABLE_FREE
	64	select HAVE_SYSCALL_TRACEPOINTS
	65	select IRQ_DOMAIN
	66	select MODULES_USE_ELF_RELA
	67	select NO_BOOTMEM
	68	select OF
	69	select OF_EARLY_FLATTREE
	70	select OF_RESERVED_MEM
	71	select PERF_USE_VMALLOC
	72	select POWER_RESET
	73	select POWER_SUPPLY
	74	select RTC_LIB
	75	select SPARSE_IRQ
	76	select SYSCTL_EXCEPTION_TRACE
	77	select HAVE_CONTEXT_TRACKING
	78	help
	79	ARM 64-bit (AArch64) Linux support.
	80
	81	config 64BIT
	82	def_bool y
	83
	84	config ARCH_PHYS_ADDR_T_64BIT
	85	def_bool y
	86
	87	config MMU
	88	def_bool y
	89
	90	config NO_IOPORT_MAP
	91	def_bool y if !PCI
	92
	93	config STACKTRACE_SUPPORT
	94	def_bool y
	95
	96	config LOCKDEP_SUPPORT
	97	def_bool y
	98
	99	config TRACE_IRQFLAGS_SUPPORT
	100	def_bool y
	101
	102	config RWSEM_XCHGADD_ALGORITHM
	103	def_bool y
	104
	105	config GENERIC_HWEIGHT
	106	def_bool y
	107
	108	config GENERIC_CSUM
	109	def_bool y
	110
	111	config GENERIC_CALIBRATE_DELAY
	112	def_bool y
	113
	114	config ZONE_DMA
	115	def_bool y
	116
	117	config HAVE_GENERIC_RCU_GUP
	118	def_bool y
	119
	120	config ARCH_DMA_ADDR_T_64BIT
	121	def_bool y
	122
	123	config NEED_DMA_MAP_STATE
	124	def_bool y
	125
	126	config NEED_SG_DMA_LENGTH
	127	def_bool y
	128
	129	config SWIOTLB
	130	def_bool y
	131
	132	config IOMMU_HELPER
	133	def_bool SWIOTLB
	134
	135	config KERNEL_MODE_NEON
	136	def_bool y
	137
	138	config FIX_EARLYCON_MEM
	139	def_bool y
	140
	141	source "init/Kconfig"
	142
	143	source "kernel/Kconfig.freezer"
	144
	145	menu "Platform selection"
	146
	147	config ARCH_THUNDER
	148	bool "Cavium Inc. Thunder SoC Family"
	149	help
	150	This enables support for Cavium's Thunder Family of SoCs.
	151
	152	config ARCH_VEXPRESS
	153	bool "ARMv8 software model (Versatile Express)"
	154	select ARCH_REQUIRE_GPIOLIB
	155	select COMMON_CLK_VERSATILE
	156	select POWER_RESET_VEXPRESS
	157	select VEXPRESS_CONFIG
	158	help
	159	This enables support for the ARMv8 software model (Versatile
	160	Express).
	161
	162	config ARCH_XGENE
	163	bool "AppliedMicro X-Gene SOC Family"
	164	help
	165	This enables support for AppliedMicro X-Gene SOC Family
	166
	167	endmenu
	168
	169	menu "Bus support"
	170
	171	config ARM_AMBA
	172	bool
	173
	174	config PCI
	175	bool "PCI support"
	176	help
	177	This feature enables support for PCI bus system. If you say Y
	178	here, the kernel will include drivers and infrastructure code
	179	to support PCI bus devices.
	180
	181	config PCI_DOMAINS
	182	def_bool PCI
	183
	184	config PCI_DOMAINS_GENERIC
	185	def_bool PCI
	186
	187	config PCI_SYSCALL
	188	def_bool PCI
	189
	190	source "drivers/pci/Kconfig"
	191	source "drivers/pci/pcie/Kconfig"
	192	source "drivers/pci/hotplug/Kconfig"
	193
	194	endmenu
	195
	196	menu "Kernel Features"
	197
	198	choice
	199	prompt "Page size"
	200	default ARM64_4K_PAGES
	201	help
	202	Page size (translation granule) configuration.
	203
	204	config ARM64_4K_PAGES
	205	bool "4KB"
	206	help
	207	This feature enables 4KB pages support.
	208
	209	config ARM64_64K_PAGES
	210	bool "64KB"
	211	help
	212	This feature enables 64KB pages support (4KB by default)
	213	allowing only two levels of page tables and faster TLB
	214	look-up. AArch32 emulation is not available when this feature
	215	is enabled.
	216
	217	endchoice
	218
	219	choice
	220	prompt "Virtual address space size"
	221	default ARM64_VA_BITS_39 if ARM64_4K_PAGES
	222	default ARM64_VA_BITS_42 if ARM64_64K_PAGES
	223	help
	224	Allows choosing one of multiple possible virtual address
	225	space sizes. The level of translation table is determined by
	226	a combination of page size and virtual address space size.
	227
	228	config ARM64_VA_BITS_39
	229	bool "39-bit"
	230	depends on ARM64_4K_PAGES
	231
	232	config ARM64_VA_BITS_42
	233	bool "42-bit"
	234	depends on ARM64_64K_PAGES
	235
	236	config ARM64_VA_BITS_48
	237	bool "48-bit"
	238	depends on !ARM_SMMU
	239
	240	endchoice
	241
	242	config ARM64_VA_BITS
	243	int
	244	default 39 if ARM64_VA_BITS_39
	245	default 42 if ARM64_VA_BITS_42
	246	default 48 if ARM64_VA_BITS_48
	247
	248	config ARM64_PGTABLE_LEVELS
	249	int
	250	default 2 if ARM64_64K_PAGES && ARM64_VA_BITS_42
	251	default 3 if ARM64_64K_PAGES && ARM64_VA_BITS_48
	252	default 3 if ARM64_4K_PAGES && ARM64_VA_BITS_39
	253	default 4 if ARM64_4K_PAGES && ARM64_VA_BITS_48
	254
	255	config CPU_BIG_ENDIAN
	256	bool "Build big-endian kernel"
	257	help
	258	Say Y if you plan on running a kernel in big-endian mode.
	259
	260	config SMP
	261	bool "Symmetric Multi-Processing"
	262	help
	263	This enables support for systems with more than one CPU. If
	264	you say N here, the kernel will run on single and
	265	multiprocessor machines, but will use only one CPU of a
	266	multiprocessor machine. If you say Y here, the kernel will run
	267	on many, but not all, single processor machines. On a single
	268	processor machine, the kernel will run faster if you say N
	269	here.
	270
	271	If you don't know what to do here, say N.
	272
	273	config SCHED_MC
	274	bool "Multi-core scheduler support"
	275	depends on SMP
	276	help
	277	Multi-core scheduler support improves the CPU scheduler's decision
	278	making when dealing with multi-core CPU chips at a cost of slightly
	279	increased overhead in some places. If unsure say N here.
	280
	281	config SCHED_SMT
	282	bool "SMT scheduler support"
	283	depends on SMP
	284	help
	285	Improves the CPU scheduler's decision making when dealing with
	286	MultiThreading at a cost of slightly increased overhead in some
	287	places. If unsure say N here.
	288
	289	config NR_CPUS
	290	int "Maximum number of CPUs (2-64)"
	291	range 2 64
	292	depends on SMP
	293	# These have to remain sorted largest to smallest
	294	default "64"
	295
	296	config HOTPLUG_CPU
	297	bool "Support for hot-pluggable CPUs"
	298	depends on SMP
	299	help
	300	Say Y here to experiment with turning CPUs off and on. CPUs
	301	can be controlled through /sys/devices/system/cpu.
	302
	303	source kernel/Kconfig.preempt
	304
	305	config HZ
	306	int
	307	default 100
	308
	309	config ARCH_HAS_HOLES_MEMORYMODEL
	310	def_bool y if SPARSEMEM
	311
	312	config ARCH_SPARSEMEM_ENABLE
	313	def_bool y
	314	select SPARSEMEM_VMEMMAP_ENABLE
	315
	316	config ARCH_SPARSEMEM_DEFAULT
	317	def_bool ARCH_SPARSEMEM_ENABLE
	318
	319	config ARCH_SELECT_MEMORY_MODEL
	320	def_bool ARCH_SPARSEMEM_ENABLE
	321
	322	config HAVE_ARCH_PFN_VALID
	323	def_bool ARCH_HAS_HOLES_MEMORYMODEL \|\| !SPARSEMEM
	324
	325	config HW_PERF_EVENTS
	326	bool "Enable hardware performance counter support for perf events"
	327	depends on PERF_EVENTS
	328	default y
	329	help
	330	Enable hardware performance counter support for perf events. If
	331	disabled, perf events will use software events only.
	332
	333	config SYS_SUPPORTS_HUGETLBFS
	334	def_bool y
	335
	336	config ARCH_WANT_GENERAL_HUGETLB
	337	def_bool y
	338
	339	config ARCH_WANT_HUGE_PMD_SHARE
	340	def_bool y if !ARM64_64K_PAGES
	341
	342	config HAVE_ARCH_TRANSPARENT_HUGEPAGE
	343	def_bool y
	344
	345	config ARCH_HAS_CACHE_LINE_SIZE
	346	def_bool y
	347
	348	source "mm/Kconfig"
	349
	350	config XEN_DOM0
	351	def_bool y
	352	depends on XEN
	353
	354	config XEN
	355	bool "Xen guest support on ARM64"
	356	depends on ARM64 && OF
	357	select SWIOTLB_XEN
	358	help
	359	Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64.
	360
	361	config FORCE_MAX_ZONEORDER
	362	int
	363	default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
	364	default "11"
	365
	366	menuconfig ARMV8_DEPRECATED
	367	bool "Emulate deprecated/obsolete ARMv8 instructions"
	368	depends on COMPAT
	369	help
	370	Legacy software support may require certain instructions
	371	that have been deprecated or obsoleted in the architecture.
	372
	373	Enable this config to enable selective emulation of these
	374	features.
	375
	376	If unsure, say Y
	377
	378	if ARMV8_DEPRECATED
	379
	380	config SWP_EMULATION
	381	bool "Emulate SWP/SWPB instructions"
	382	help
	383	ARMv8 obsoletes the use of A32 SWP/SWPB instructions such that
	384	they are always undefined. Say Y here to enable software
	385	emulation of these instructions for userspace using LDXR/STXR.
	386
	387	In some older versions of glibc [<=2.8] SWP is used during futex
	388	trylock() operations with the assumption that the code will not
	389	be preempted. This invalid assumption may be more likely to fail
	390	with SWP emulation enabled, leading to deadlock of the user
	391	application.
	392
	393	NOTE: when accessing uncached shared regions, LDXR/STXR rely
	394	on an external transaction monitoring block called a global
	395	monitor to maintain update atomicity. If your system does not
	396	implement a global monitor, this option can cause programs that
	397	perform SWP operations to uncached memory to deadlock.
	398
	399	If unsure, say Y
	400
	401	config CP15_BARRIER_EMULATION
	402	bool "Emulate CP15 Barrier instructions"
	403	help
	404	The CP15 barrier instructions - CP15ISB, CP15DSB, and
	405	CP15DMB - are deprecated in ARMv8 (and ARMv7). It is
	406	strongly recommended to use the ISB, DSB, and DMB
	407	instructions instead.
	408
	409	Say Y here to enable software emulation of these
	410	instructions for AArch32 userspace code. When this option is
	411	enabled, CP15 barrier usage is traced which can help
	412	identify software that needs updating.
	413
	414	If unsure, say Y
	415
	416	endif
	417
	418	endmenu
	419
	420	menu "Boot options"
	421
	422	config CMDLINE
	423	string "Default kernel command string"
	424	default ""
	425	help
	426	Provide a set of default command-line options at build time by
	427	entering them here. As a minimum, you should specify the the
	428	root device (e.g. root=/dev/nfs).
	429
	430	config CMDLINE_FORCE
	431	bool "Always use the default kernel command string"
	432	help
	433	Always use the default kernel command string, even if the boot
	434	loader passes other arguments to the kernel.
	435	This is useful if you cannot or don't want to change the
	436	command-line options your boot loader passes to the kernel.
	437
	438	config EFI_STUB
	439	bool
	440
	441	config EFI
	442	bool "UEFI runtime support"
	443	depends on OF && !CPU_BIG_ENDIAN
	444	select LIBFDT
	445	select UCS2_STRING
	446	select EFI_PARAMS_FROM_FDT
	447	select EFI_RUNTIME_WRAPPERS
	448	select EFI_STUB
	449	select EFI_ARMSTUB
	450	default y
	451	help
	452	This option provides support for runtime services provided
	453	by UEFI firmware (such as non-volatile variables, realtime
	454	clock, and platform reset). A UEFI stub is also provided to
	455	allow the kernel to be booted as an EFI application. This
	456	is only useful on systems that have UEFI firmware.
	457
	458	config DMI
	459	bool "Enable support for SMBIOS (DMI) tables"
	460	depends on EFI
	461	default y
	462	help
	463	This enables SMBIOS/DMI feature for systems.
	464
	465	This option is only useful on systems that have UEFI firmware.
	466	However, even with this option, the resultant kernel should
	467	continue to boot on existing non-UEFI platforms.
	468
	469	endmenu
	470
	471	menu "Userspace binary formats"
	472
	473	source "fs/Kconfig.binfmt"
	474
	475	config COMPAT
	476	bool "Kernel support for 32-bit EL0"
	477	depends on !ARM64_64K_PAGES
	478	select COMPAT_BINFMT_ELF
	479	select HAVE_UID16
	480	select OLD_SIGSUSPEND3
	481	select COMPAT_OLD_SIGACTION
	482	help
	483	This option enables support for a 32-bit EL0 running under a 64-bit
	484	kernel at EL1. AArch32-specific components such as system calls,
	485	the user helper functions, VFP support and the ptrace interface are
	486	handled appropriately by the kernel.
	487
	488	If you want to execute 32-bit userspace applications, say Y.
	489
	490	config SYSVIPC_COMPAT
	491	def_bool y
	492	depends on COMPAT && SYSVIPC
	493
	494	endmenu
	495
	496	menu "Power management options"
	497
	498	source "kernel/power/Kconfig"
	499
	500	config ARCH_SUSPEND_POSSIBLE
	501	def_bool y
	502
	503	config ARM64_CPU_SUSPEND
	504	def_bool PM_SLEEP
	505
	506	endmenu
	507
	508	menu "CPU Power Management"
	509
	510	source "drivers/cpuidle/Kconfig"
	511
	512	source "drivers/cpufreq/Kconfig"
	513
	514	endmenu
	515
	516	source "net/Kconfig"
	517
	518	source "drivers/Kconfig"
	519
	520	source "drivers/firmware/Kconfig"
	521
	522	source "fs/Kconfig"
	523
	524	source "arch/arm64/kvm/Kconfig"
	525
	526	source "arch/arm64/Kconfig.debug"
	527
	528	source "security/Kconfig"
	529
	530	source "crypto/Kconfig"
	531	if CRYPTO
	532	source "arch/arm64/crypto/Kconfig"
	533	endif
	534
	535	source "lib/Kconfig"