3 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
4 select ARCH_WANT_OPTIONAL_GPIOLIB
5 select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
6 select ARCH_WANT_FRAME_POINTERS
10 select CLONE_BACKWARDS
12 select GENERIC_CLOCKEVENTS
13 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
14 select GENERIC_CPU_AUTOPROBE
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
26 select HAVE_GENERIC_DMA_COHERENT
27 select HAVE_GENERIC_HARDIRQS
28 select HAVE_HW_BREAKPOINT if PERF_EVENTS
30 select HAVE_PERF_EVENTS
32 select MODULES_USE_ELF_RELA
35 select OF_EARLY_FLATTREE
36 select PERF_USE_VMALLOC
41 select SYSCTL_EXCEPTION_TRACE
43 ARM 64-bit (AArch64) Linux support.
48 config ARCH_PHYS_ADDR_T_64BIT
57 config STACKTRACE_SUPPORT
60 config LOCKDEP_SUPPORT
63 config TRACE_IRQFLAGS_SUPPORT
66 config GENERIC_LOCKBREAK
68 depends on SMP && PREEMPT
70 config RWSEM_GENERIC_SPINLOCK
73 config GENERIC_HWEIGHT
79 config GENERIC_CALIBRATE_DELAY
85 config ARCH_DMA_ADDR_T_64BIT
88 config NEED_DMA_MAP_STATE
91 config NEED_SG_DMA_LENGTH
100 source "init/Kconfig"
102 source "kernel/Kconfig.freezer"
104 menu "Platform selection"
107 bool "ARMv8 software model (Versatile Express)"
108 select ARCH_REQUIRE_GPIOLIB
109 select COMMON_CLK_VERSATILE
110 select POWER_RESET_VEXPRESS
111 select VEXPRESS_CONFIG
113 This enables support for the ARMv8 software model (Versatile
125 menu "Kernel Features"
127 config ARM64_64K_PAGES
128 bool "Enable 64KB pages support"
130 This feature enables 64KB pages support (4KB by default)
131 allowing only two levels of page tables and faster TLB
132 look-up. AArch32 emulation is not available when this feature
136 bool "Symmetric Multi-Processing"
137 select USE_GENERIC_SMP_HELPERS
139 This enables support for systems with more than one CPU. If
140 you say N here, the kernel will run on single and
141 multiprocessor machines, but will use only one CPU of a
142 multiprocessor machine. If you say Y here, the kernel will run
143 on many, but not all, single processor machines. On a single
144 processor machine, the kernel will run faster if you say N
147 If you don't know what to do here, say N.
150 int "Maximum number of CPUs (2-32)"
156 bool "Emulate SWP/SWPB instructions"
158 ARMv6 architecture deprecates use of the SWP/SWPB instructions. ARMv8
159 oblosetes the use of SWP/SWPB instructions. ARMv7 multiprocessing
160 extensions introduce the ability to disable these instructions,
161 triggering an undefined instruction exception when executed. Say Y
162 here to enable software emulation of these instructions for userspace
163 (not kernel) using LDREX/STREX. Also creates /proc/cpu/swp_emulation
166 In some older versions of glibc [<=2.8] SWP is used during futex
167 trylock() operations with the assumption that the code will not
168 be preempted. This invalid assumption may be more likely to fail
169 with SWP emulation enabled, leading to deadlock of the user
172 NOTE: when accessing uncached shared regions, LDREX/STREX rely
173 on an external transaction monitoring block called a global
174 monitor to maintain update atomicity. If your system does not
175 implement a global monitor, this option can cause programs that
176 perform SWP operations to uncached memory to deadlock.
180 source kernel/Kconfig.preempt
186 config ARCH_HAS_HOLES_MEMORYMODEL
187 def_bool y if SPARSEMEM
189 config ARCH_SPARSEMEM_ENABLE
191 select SPARSEMEM_VMEMMAP_ENABLE
193 config ARCH_SPARSEMEM_DEFAULT
194 def_bool ARCH_SPARSEMEM_ENABLE
196 config ARCH_SELECT_MEMORY_MODEL
197 def_bool ARCH_SPARSEMEM_ENABLE
199 config HAVE_ARCH_PFN_VALID
200 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
202 config HW_PERF_EVENTS
203 bool "Enable hardware performance counter support for perf events"
204 depends on PERF_EVENTS
207 Enable hardware performance counter support for perf events. If
208 disabled, perf events will use software events only.
211 bool "Kernel support for ARMv7 applications"
215 This option enables features that allow that ran on an ARMv7 or older
216 processor to continue functioning.
218 If you want to execute ARMv7 applications, say Y
221 config ARMV7_COMPAT_CP15_BARRIER
222 bool "Allow applications to use the CP15 barrier operations"
223 depends on ARMV7_COMPAT
226 This option allows applications to use deprecated CP15 barrier
227 instructions. This is useful because this was the only way to create
228 a barrier on older ARM processors.
230 If you want to execute ARMv7 applications, say Y
239 string "Default kernel command string"
242 Provide a set of default command-line options at build time by
243 entering them here. As a minimum, you should specify the the
244 root device (e.g. root=/dev/nfs).
247 prompt "Kernel command line type" if CMDLINE != ""
248 default CMDLINE_FROM_BOOTLOADER
250 config CMDLINE_FROM_BOOTLOADER
251 bool "Use bootloader kernel arguments if available"
253 Uses the command-line options passed by the boot loader. If
254 the boot loader doesn't provide any, the default kernel command
255 string provided in CMDLINE will be used.
257 config CMDLINE_EXTEND
258 bool "Extend bootloader kernel arguments"
260 The command-line arguments provided by the boot loader will be
261 appended to the default kernel command string.
264 bool "Always use the default kernel command string"
266 Always use the default kernel command string, even if the boot
267 loader passes other arguments to the kernel.
268 This is useful if you cannot or don't want to change the
269 command-line options your boot loader passes to the kernel.
272 config BUILD_ARM64_APPENDED_DTB_IMAGE
273 bool "Build a concatenated Image.gz/dtb by default"
276 Enabling this option will cause a concatenated Image.gz and list of
277 DTBs to be built by default (instead of a standalone Image.gz.)
278 The image will built in arch/arm64/boot/Image.gz-dtb
280 config BUILD_ARM64_APPENDED_DTB_IMAGE_NAMES
281 string "Default dtb names"
282 depends on BUILD_ARM64_APPENDED_DTB_IMAGE
284 Space separated list of names of dtbs to append when
285 building a concatenated Image.gz-dtb.
289 menu "Userspace binary formats"
291 source "fs/Kconfig.binfmt"
294 bool "Kernel support for 32-bit EL0"
295 depends on !ARM64_64K_PAGES
296 select COMPAT_BINFMT_ELF
298 select OLD_SIGSUSPEND3
299 select COMPAT_OLD_SIGACTION
301 This option enables support for a 32-bit EL0 running under a 64-bit
302 kernel at EL1. AArch32-specific components such as system calls,
303 the user helper functions, VFP support and the ptrace interface are
304 handled appropriately by the kernel.
306 If you want to execute 32-bit userspace applications, say Y.
308 config SYSVIPC_COMPAT
310 depends on COMPAT && SYSVIPC
316 source "drivers/Kconfig"
320 source "arch/arm64/Kconfig.debug"
322 source "security/Kconfig"
324 source "crypto/Kconfig"
326 source "arch/arm64/crypto/Kconfig"