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_SCHED_CLOCK
  19         select GENERIC_SMP_IDLE_THREAD
  20         select GENERIC_TIME_VSYSCALL
  21         select HARDIRQS_SW_RESEND
  22         select HAVE_ARCH_TRACEHOOK
  23         select HAVE_DEBUG_BUGVERBOSE
  24         select HAVE_DEBUG_KMEMLEAK
  25         select HAVE_DMA_API_DEBUG
  26         select HAVE_DMA_ATTRS
  27         select HAVE_GENERIC_DMA_COHERENT
  28         select HAVE_HW_BREAKPOINT if PERF_EVENTS
  29         select HAVE_MEMBLOCK
  30         select HAVE_PERF_EVENTS
  31         select IRQ_DOMAIN
  32         select MODULES_USE_ELF_RELA
  33         select NO_BOOTMEM
  34         select OF
  35         select OF_EARLY_FLATTREE
  36         select PERF_USE_VMALLOC
  37         select POWER_RESET
  38         select POWER_SUPPLY
  39         select RTC_LIB
  40         select SPARSE_IRQ
  41         select SYSCTL_EXCEPTION_TRACE
  42         help
  43           ARM 64-bit (AArch64) Linux support.
  44
  45 config 64BIT
  46         def_bool y
  47
  48 config ARCH_PHYS_ADDR_T_64BIT
  49         def_bool y
  50
  51 config MMU
  52         def_bool y
  53
  54 config NO_IOPORT
  55         def_bool y
  56
  57 config STACKTRACE_SUPPORT
  58         def_bool y
  59
  60 config LOCKDEP_SUPPORT
  61         def_bool y
  62
  63 config TRACE_IRQFLAGS_SUPPORT
  64         def_bool y
  65
  66 config RWSEM_GENERIC_SPINLOCK
  67         def_bool y
  68
  69 config GENERIC_HWEIGHT
  70         def_bool y
  71
  72 config GENERIC_CSUM
  73         def_bool y
  74
  75 config GENERIC_CALIBRATE_DELAY
  76         def_bool y
  77
  78 config ZONE_DMA32
  79         def_bool y
  80
  81 config ARCH_DMA_ADDR_T_64BIT
  82         def_bool y
  83
  84 config NEED_DMA_MAP_STATE
  85         def_bool y
  86
  87 config NEED_SG_DMA_LENGTH
  88         def_bool y
  89
  90 config SWIOTLB
  91         def_bool y
  92
  93 config IOMMU_HELPER
  94         def_bool SWIOTLB
  95
  96 config KERNEL_MODE_NEON
  97         def_bool y
  98
  99 source "init/Kconfig"
 100
 101 source "kernel/Kconfig.freezer"
 102
 103 menu "Platform selection"
 104
 105 config ARCH_VEXPRESS
 106         bool "ARMv8 software model (Versatile Express)"
 107         select ARCH_REQUIRE_GPIOLIB
 108         select COMMON_CLK_VERSATILE
 109         select POWER_RESET_VEXPRESS
 110         select VEXPRESS_CONFIG
 111         help
 112           This enables support for the ARMv8 software model (Versatile
 113           Express).
 114
 115 config ARCH_XGENE
 116         bool "AppliedMicro X-Gene SOC Family"
 117         help
 118           This enables support for AppliedMicro X-Gene SOC Family
 119
 120 endmenu
 121
 122 menu "Bus support"
 123
 124 config ARM_AMBA
 125         bool
 126
 127 endmenu
 128
 129 menu "Kernel Features"
 130
 131 config ARM64_64K_PAGES
 132         bool "Enable 64KB pages support"
 133         help
 134           This feature enables 64KB pages support (4KB by default)
 135           allowing only two levels of page tables and faster TLB
 136           look-up. AArch32 emulation is not available when this feature
 137           is enabled.
 138
 139 config CPU_BIG_ENDIAN
 140        bool "Build big-endian kernel"
 141        help
 142          Say Y if you plan on running a kernel in big-endian mode.
 143
 144 config SMP
 145         bool "Symmetric Multi-Processing"
 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         select SWIOTLB_XEN
 224         help
 225           Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64.
 226
 227 config FORCE_MAX_ZONEORDER
 228         int
 229         default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
 230         default "11"
 231
 232 endmenu
 233
 234 menu "Boot options"
 235
 236 config CMDLINE
 237         string "Default kernel command string"
 238         default ""
 239         help
 240           Provide a set of default command-line options at build time by
 241           entering them here. As a minimum, you should specify the the
 242           root device (e.g. root=/dev/nfs).
 243
 244 config CMDLINE_FORCE
 245         bool "Always use the default kernel command string"
 246         help
 247           Always use the default kernel command string, even if the boot
 248           loader passes other arguments to the kernel.
 249           This is useful if you cannot or don't want to change the
 250           command-line options your boot loader passes to the kernel.
 251
 252 endmenu
 253
 254 menu "Userspace binary formats"
 255
 256 source "fs/Kconfig.binfmt"
 257
 258 config COMPAT
 259         bool "Kernel support for 32-bit EL0"
 260         depends on !ARM64_64K_PAGES
 261         select COMPAT_BINFMT_ELF
 262         select HAVE_UID16
 263         select OLD_SIGSUSPEND3
 264         select COMPAT_OLD_SIGACTION
 265         help
 266           This option enables support for a 32-bit EL0 running under a 64-bit
 267           kernel at EL1. AArch32-specific components such as system calls,
 268           the user helper functions, VFP support and the ptrace interface are
 269           handled appropriately by the kernel.
 270
 271           If you want to execute 32-bit userspace applications, say Y.
 272
 273 config SYSVIPC_COMPAT
 274         def_bool y
 275         depends on COMPAT && SYSVIPC
 276
 277 endmenu
 278
 279 source "net/Kconfig"
 280
 281 source "drivers/Kconfig"
 282
 283 source "fs/Kconfig"
 284
 285 source "arch/arm64/kvm/Kconfig"
 286
 287 source "arch/arm64/Kconfig.debug"
 288
 289 source "security/Kconfig"
 290
 291 source "crypto/Kconfig"
 292
 293 source "lib/Kconfig"