arch/arm64/Kconfig

   1 config ARM64
   2         def_bool y
   3         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
   4         select ARCH_USE_CMPXCHG_LOCKREF
   5         select ARCH_WANT_OPTIONAL_GPIOLIB
   6         select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
   7         select ARCH_WANT_FRAME_POINTERS
   8         select ARM_AMBA
   9         select ARM_ARCH_TIMER
  10         select ARM_GIC
  11         select BUILDTIME_EXTABLE_SORT
  12         select CLONE_BACKWARDS
  13         select COMMON_CLK
  14         select GENERIC_CLOCKEVENTS
  15         select GENERIC_IOMAP
  16         select GENERIC_IRQ_PROBE
  17         select GENERIC_IRQ_SHOW
  18         select GENERIC_SMP_IDLE_THREAD
  19         select GENERIC_TIME_VSYSCALL
  20         select HARDIRQS_SW_RESEND
  21         select HAVE_ARCH_TRACEHOOK
  22         select HAVE_DEBUG_BUGVERBOSE
  23         select HAVE_DEBUG_KMEMLEAK
  24         select HAVE_DMA_API_DEBUG
  25         select HAVE_DMA_ATTRS
  26         select HAVE_GENERIC_DMA_COHERENT
  27         select HAVE_HW_BREAKPOINT if PERF_EVENTS
  28         select HAVE_MEMBLOCK
  29         select HAVE_PERF_EVENTS
  30         select IRQ_DOMAIN
  31         select MODULES_USE_ELF_RELA
  32         select NO_BOOTMEM
  33         select OF
  34         select OF_EARLY_FLATTREE
  35         select PERF_USE_VMALLOC
  36         select POWER_RESET
  37         select POWER_SUPPLY
  38         select RTC_LIB
  39         select SPARSE_IRQ
  40         select SYSCTL_EXCEPTION_TRACE
  41         help
  42           ARM 64-bit (AArch64) Linux support.
  43
  44 config 64BIT
  45         def_bool y
  46
  47 config ARCH_PHYS_ADDR_T_64BIT
  48         def_bool y
  49
  50 config MMU
  51         def_bool y
  52
  53 config NO_IOPORT
  54         def_bool y
  55
  56 config STACKTRACE_SUPPORT
  57         def_bool y
  58
  59 config LOCKDEP_SUPPORT
  60         def_bool y
  61
  62 config TRACE_IRQFLAGS_SUPPORT
  63         def_bool y
  64
  65 config RWSEM_GENERIC_SPINLOCK
  66         def_bool y
  67
  68 config GENERIC_HWEIGHT
  69         def_bool y
  70
  71 config GENERIC_CSUM
  72         def_bool y
  73
  74 config GENERIC_CALIBRATE_DELAY
  75         def_bool y
  76
  77 config ZONE_DMA32
  78         def_bool y
  79
  80 config ARCH_DMA_ADDR_T_64BIT
  81         def_bool y
  82
  83 config NEED_DMA_MAP_STATE
  84         def_bool y
  85
  86 config NEED_SG_DMA_LENGTH
  87         def_bool y
  88
  89 config SWIOTLB
  90         def_bool y
  91
  92 config IOMMU_HELPER
  93         def_bool SWIOTLB
  94
  95 config KERNEL_MODE_NEON
  96         def_bool y
  97
  98 source "init/Kconfig"
  99
 100 source "kernel/Kconfig.freezer"
 101
 102 menu "Platform selection"
 103
 104 config ARCH_VEXPRESS
 105         bool "ARMv8 software model (Versatile Express)"
 106         select ARCH_REQUIRE_GPIOLIB
 107         select COMMON_CLK_VERSATILE
 108         select POWER_RESET_VEXPRESS
 109         select VEXPRESS_CONFIG
 110         help
 111           This enables support for the ARMv8 software model (Versatile
 112           Express).
 113
 114 config ARCH_XGENE
 115         bool "AppliedMicro X-Gene SOC Family"
 116         help
 117           This enables support for AppliedMicro X-Gene SOC Family
 118
 119 endmenu
 120
 121 menu "Bus support"
 122
 123 config ARM_AMBA
 124         bool
 125
 126 endmenu
 127
 128 menu "Kernel Features"
 129
 130 config ARM64_64K_PAGES
 131         bool "Enable 64KB pages support"
 132         help
 133           This feature enables 64KB pages support (4KB by default)
 134           allowing only two levels of page tables and faster TLB
 135           look-up. AArch32 emulation is not available when this feature
 136           is enabled.
 137
 138 config CPU_BIG_ENDIAN
 139        bool "Build big-endian kernel"
 140        help
 141          Say Y if you plan on running a kernel in big-endian mode.
 142
 143 config SMP
 144         bool "Symmetric Multi-Processing"
 145         select USE_GENERIC_SMP_HELPERS
 146         help
 147           This enables support for systems with more than one CPU.  If
 148           you say N here, the kernel will run on single and
 149           multiprocessor machines, but will use only one CPU of a
 150           multiprocessor machine. If you say Y here, the kernel will run
 151           on many, but not all, single processor machines. On a single
 152           processor machine, the kernel will run faster if you say N
 153           here.
 154
 155           If you don't know what to do here, say N.
 156
 157 config NR_CPUS
 158         int "Maximum number of CPUs (2-32)"
 159         range 2 32
 160         depends on SMP
 161         # These have to remain sorted largest to smallest
 162         default "8" if ARCH_XGENE
 163         default "4"
 164
 165 config HOTPLUG_CPU
 166         bool "Support for hot-pluggable CPUs"
 167         depends on SMP
 168         help
 169           Say Y here to experiment with turning CPUs off and on.  CPUs
 170           can be controlled through /sys/devices/system/cpu.
 171
 172 source kernel/Kconfig.preempt
 173
 174 config HZ
 175         int
 176         default 100
 177
 178 config ARCH_HAS_HOLES_MEMORYMODEL
 179         def_bool y if SPARSEMEM
 180
 181 config ARCH_SPARSEMEM_ENABLE
 182         def_bool y
 183         select SPARSEMEM_VMEMMAP_ENABLE
 184
 185 config ARCH_SPARSEMEM_DEFAULT
 186         def_bool ARCH_SPARSEMEM_ENABLE
 187
 188 config ARCH_SELECT_MEMORY_MODEL
 189         def_bool ARCH_SPARSEMEM_ENABLE
 190
 191 config HAVE_ARCH_PFN_VALID
 192         def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
 193
 194 config HW_PERF_EVENTS
 195         bool "Enable hardware performance counter support for perf events"
 196         depends on PERF_EVENTS
 197         default y
 198         help
 199           Enable hardware performance counter support for perf events. If
 200           disabled, perf events will use software events only.
 201
 202 config SYS_SUPPORTS_HUGETLBFS
 203         def_bool y
 204
 205 config ARCH_WANT_GENERAL_HUGETLB
 206         def_bool y
 207
 208 config ARCH_WANT_HUGE_PMD_SHARE
 209         def_bool y if !ARM64_64K_PAGES
 210
 211 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
 212         def_bool y
 213
 214 source "mm/Kconfig"
 215
 216 config XEN_DOM0
 217         def_bool y
 218         depends on XEN
 219
 220 config XEN
 221         bool "Xen guest support on ARM64 (EXPERIMENTAL)"
 222         depends on ARM64 && OF
 223         help
 224           Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64.
 225
 226 config FORCE_MAX_ZONEORDER
 227         int
 228         default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
 229         default "11"
 230
 231 endmenu
 232
 233 menu "Boot options"
 234
 235 config CMDLINE
 236         string "Default kernel command string"
 237         default ""
 238         help
 239           Provide a set of default command-line options at build time by
 240           entering them here. As a minimum, you should specify the the
 241           root device (e.g. root=/dev/nfs).
 242
 243 config CMDLINE_FORCE
 244         bool "Always use the default kernel command string"
 245         help
 246           Always use the default kernel command string, even if the boot
 247           loader passes other arguments to the kernel.
 248           This is useful if you cannot or don't want to change the
 249           command-line options your boot loader passes to the kernel.
 250
 251 endmenu
 252
 253 menu "Userspace binary formats"
 254
 255 source "fs/Kconfig.binfmt"
 256
 257 config COMPAT
 258         bool "Kernel support for 32-bit EL0"
 259         depends on !ARM64_64K_PAGES
 260         select COMPAT_BINFMT_ELF
 261         select HAVE_UID16
 262         select OLD_SIGSUSPEND3
 263         select COMPAT_OLD_SIGACTION
 264         help
 265           This option enables support for a 32-bit EL0 running under a 64-bit
 266           kernel at EL1. AArch32-specific components such as system calls,
 267           the user helper functions, VFP support and the ptrace interface are
 268           handled appropriately by the kernel.
 269
 270           If you want to execute 32-bit userspace applications, say Y.
 271
 272 config SYSVIPC_COMPAT
 273         def_bool y
 274         depends on COMPAT && SYSVIPC
 275
 276 endmenu
 277
 278 source "net/Kconfig"
 279
 280 source "drivers/Kconfig"
 281
 282 source "fs/Kconfig"
 283
 284 source "arch/arm64/kvm/Kconfig"
 285
 286 source "arch/arm64/Kconfig.debug"
 287
 288 source "security/Kconfig"
 289
 290 source "crypto/Kconfig"
 291
 292 source "lib/Kconfig"