linux/arch/arm64/Kconfig
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   1config ARM64
   2        def_bool y
   3        select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
   4        select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
   5        select GENERIC_CLOCKEVENTS
   6        select GENERIC_HARDIRQS_NO_DEPRECATED
   7        select GENERIC_IOMAP
   8        select GENERIC_IRQ_PROBE
   9        select GENERIC_IRQ_SHOW
  10        select GENERIC_SMP_IDLE_THREAD
  11        select GENERIC_TIME_VSYSCALL
  12        select HARDIRQS_SW_RESEND
  13        select HAVE_ARCH_TRACEHOOK
  14        select HAVE_DEBUG_BUGVERBOSE
  15        select HAVE_DEBUG_KMEMLEAK
  16        select HAVE_DMA_API_DEBUG
  17        select HAVE_DMA_ATTRS
  18        select HAVE_GENERIC_DMA_COHERENT
  19        select HAVE_GENERIC_HARDIRQS
  20        select HAVE_HW_BREAKPOINT if PERF_EVENTS
  21        select HAVE_IRQ_WORK
  22        select HAVE_MEMBLOCK
  23        select HAVE_PERF_EVENTS
  24        select HAVE_SPARSE_IRQ
  25        select IRQ_DOMAIN
  26        select MODULES_USE_ELF_RELA
  27        select NO_BOOTMEM
  28        select OF
  29        select OF_EARLY_FLATTREE
  30        select PERF_USE_VMALLOC
  31        select RTC_LIB
  32        select SPARSE_IRQ
  33        select SYSCTL_EXCEPTION_TRACE
  34        help
  35          ARM 64-bit (AArch64) Linux support.
  36
  37config 64BIT
  38        def_bool y
  39
  40config ARCH_PHYS_ADDR_T_64BIT
  41        def_bool y
  42
  43config MMU
  44        def_bool y
  45
  46config NO_IOPORT
  47        def_bool y
  48
  49config STACKTRACE_SUPPORT
  50        def_bool y
  51
  52config LOCKDEP_SUPPORT
  53        def_bool y
  54
  55config TRACE_IRQFLAGS_SUPPORT
  56        def_bool y
  57
  58config GENERIC_LOCKBREAK
  59        def_bool y
  60        depends on SMP && PREEMPT
  61
  62config RWSEM_GENERIC_SPINLOCK
  63        def_bool y
  64
  65config GENERIC_HWEIGHT
  66        def_bool y
  67
  68config GENERIC_CSUM
  69        def_bool y
  70
  71config GENERIC_CALIBRATE_DELAY
  72        def_bool y
  73
  74config ZONE_DMA32
  75        def_bool y
  76
  77config ARCH_DMA_ADDR_T_64BIT
  78        def_bool y
  79
  80config NEED_DMA_MAP_STATE
  81        def_bool y
  82
  83config NEED_SG_DMA_LENGTH
  84        def_bool y
  85
  86config SWIOTLB
  87        def_bool y
  88
  89config IOMMU_HELPER
  90        def_bool SWIOTLB
  91
  92source "init/Kconfig"
  93
  94source "kernel/Kconfig.freezer"
  95
  96menu "System Type"
  97
  98endmenu
  99
 100menu "Bus support"
 101
 102config ARM_AMBA
 103        bool
 104
 105endmenu
 106
 107menu "Kernel Features"
 108
 109source "kernel/time/Kconfig"
 110
 111config ARM64_64K_PAGES
 112        bool "Enable 64KB pages support"
 113        help
 114          This feature enables 64KB pages support (4KB by default)
 115          allowing only two levels of page tables and faster TLB
 116          look-up. AArch32 emulation is not available when this feature
 117          is enabled.
 118
 119config SMP
 120        bool "Symmetric Multi-Processing"
 121        select USE_GENERIC_SMP_HELPERS
 122        help
 123          This enables support for systems with more than one CPU.  If
 124          you say N here, the kernel will run on single and
 125          multiprocessor machines, but will use only one CPU of a
 126          multiprocessor machine. If you say Y here, the kernel will run
 127          on many, but not all, single processor machines. On a single
 128          processor machine, the kernel will run faster if you say N
 129          here.
 130
 131          If you don't know what to do here, say N.
 132
 133config NR_CPUS
 134        int "Maximum number of CPUs (2-32)"
 135        range 2 32
 136        depends on SMP
 137        default "4"
 138
 139source kernel/Kconfig.preempt
 140
 141config HZ
 142        int
 143        default 100
 144
 145config ARCH_HAS_HOLES_MEMORYMODEL
 146        def_bool y if SPARSEMEM
 147
 148config ARCH_SPARSEMEM_ENABLE
 149        def_bool y
 150        select SPARSEMEM_VMEMMAP_ENABLE
 151
 152config ARCH_SPARSEMEM_DEFAULT
 153        def_bool ARCH_SPARSEMEM_ENABLE
 154
 155config ARCH_SELECT_MEMORY_MODEL
 156        def_bool ARCH_SPARSEMEM_ENABLE
 157
 158config HAVE_ARCH_PFN_VALID
 159        def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
 160
 161config HW_PERF_EVENTS
 162        bool "Enable hardware performance counter support for perf events"
 163        depends on PERF_EVENTS
 164        default y
 165        help
 166          Enable hardware performance counter support for perf events. If
 167          disabled, perf events will use software events only.
 168
 169source "mm/Kconfig"
 170
 171endmenu
 172
 173menu "Boot options"
 174
 175config CMDLINE
 176        string "Default kernel command string"
 177        default ""
 178        help
 179          Provide a set of default command-line options at build time by
 180          entering them here. As a minimum, you should specify the the
 181          root device (e.g. root=/dev/nfs).
 182
 183config CMDLINE_FORCE
 184        bool "Always use the default kernel command string"
 185        help
 186          Always use the default kernel command string, even if the boot
 187          loader passes other arguments to the kernel.
 188          This is useful if you cannot or don't want to change the
 189          command-line options your boot loader passes to the kernel.
 190
 191endmenu
 192
 193menu "Userspace binary formats"
 194
 195source "fs/Kconfig.binfmt"
 196
 197config COMPAT
 198        bool "Kernel support for 32-bit EL0"
 199        depends on !ARM64_64K_PAGES
 200        select COMPAT_BINFMT_ELF
 201        select HAVE_UID16
 202        help
 203          This option enables support for a 32-bit EL0 running under a 64-bit
 204          kernel at EL1. AArch32-specific components such as system calls,
 205          the user helper functions, VFP support and the ptrace interface are
 206          handled appropriately by the kernel.
 207
 208          If you want to execute 32-bit userspace applications, say Y.
 209
 210config SYSVIPC_COMPAT
 211        def_bool y
 212        depends on COMPAT && SYSVIPC
 213
 214endmenu
 215
 216source "net/Kconfig"
 217
 218source "drivers/Kconfig"
 219
 220source "fs/Kconfig"
 221
 222source "arch/arm64/Kconfig.debug"
 223
 224source "security/Kconfig"
 225
 226source "crypto/Kconfig"
 227
 228source "lib/Kconfig"
 229
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