3 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
5 select ARCH_USE_CMPXCHG_LOCKREF
7 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
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
16 select BUILDTIME_EXTABLE_SORT
17 select AUDIT_ARCH_COMPAT_GENERIC
18 select CLONE_BACKWARDS
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
28 select GENERIC_IRQ_PROBE
29 select GENERIC_IRQ_SHOW
30 select GENERIC_SMP_IDLE_THREAD
31 select GENERIC_STRNCPY_FROM_USER
32 select GENERIC_STRNLEN_USER
33 select GENERIC_TIME_VSYSCALL
34 select HARDIRQS_SW_RESEND
35 select HAVE_ARCH_JUMP_LABEL
37 select HAVE_ARCH_AUDITSYSCALL
38 select HAVE_ARCH_SECCOMP_FILTER
39 select HAVE_ARCH_TRACEHOOK
40 select HAVE_C_RECORDMCOUNT
41 select HAVE_CC_STACKPROTECTOR
42 select HAVE_DEBUG_BUGVERBOSE
43 select HAVE_DEBUG_KMEMLEAK
44 select HAVE_DMA_API_DEBUG
46 select HAVE_DMA_CONTIGUOUS
47 select HAVE_DYNAMIC_FTRACE
48 select HAVE_EFFICIENT_UNALIGNED_ACCESS
49 select HAVE_FTRACE_MCOUNT_RECORD
50 select HAVE_FUNCTION_TRACER
51 select HAVE_FUNCTION_GRAPH_TRACER
52 select HAVE_GENERIC_DMA_COHERENT
53 select HAVE_GENERIC_HARDIRQS
54 select HAVE_HW_BREAKPOINT if PERF_EVENTS
56 select HAVE_PATA_PLATFORM
57 select HAVE_PERF_EVENTS
59 select HAVE_PERF_USER_STACK_DUMP
60 select HAVE_SYSCALL_TRACEPOINTS
62 select MODULES_USE_ELF_RELA
65 select OF_EARLY_FLATTREE
66 select OF_RESERVED_MEM
67 select PERF_USE_VMALLOC
72 select SYSCTL_EXCEPTION_TRACE
74 ARM 64-bit (AArch64) Linux support.
79 config ARCH_PHYS_ADDR_T_64BIT
88 config STACKTRACE_SUPPORT
91 config LOCKDEP_SUPPORT
94 config TRACE_IRQFLAGS_SUPPORT
97 config RWSEM_XCHGADD_ALGORITHM
100 config GENERIC_HWEIGHT
106 config GENERIC_CALIBRATE_DELAY
112 config ARCH_DMA_ADDR_T_64BIT
115 config NEED_DMA_MAP_STATE
118 config NEED_SG_DMA_LENGTH
127 config FIX_EARLYCON_MEM
130 source "init/Kconfig"
132 source "kernel/Kconfig.freezer"
134 menu "Platform selection"
137 bool "ARMv8 software model (Versatile Express)"
138 select ARCH_REQUIRE_GPIOLIB
139 select COMMON_CLK_VERSATILE
140 select POWER_RESET_VEXPRESS
141 select VEXPRESS_CONFIG
143 This enables support for the ARMv8 software model (Versatile
147 bool "AppliedMicro X-Gene SOC Family"
149 This enables support for AppliedMicro X-Gene SOC Family
160 menu "Kernel Features"
162 config ARM64_64K_PAGES
163 bool "Enable 64KB pages support"
165 This feature enables 64KB pages support (4KB by default)
166 allowing only two levels of page tables and faster TLB
167 look-up. AArch32 emulation is not available when this feature
170 config CPU_BIG_ENDIAN
171 bool "Build big-endian kernel"
173 Say Y if you plan on running a kernel in big-endian mode.
176 bool "Symmetric Multi-Processing"
177 select USE_GENERIC_SMP_HELPERS
179 This enables support for systems with more than one CPU. If
180 you say N here, the kernel will run on single and
181 multiprocessor machines, but will use only one CPU of a
182 multiprocessor machine. If you say Y here, the kernel will run
183 on many, but not all, single processor machines. On a single
184 processor machine, the kernel will run faster if you say N
187 If you don't know what to do here, say N.
190 bool "Multi-core scheduler support"
193 Multi-core scheduler support improves the CPU scheduler's decision
194 making when dealing with multi-core CPU chips at a cost of slightly
195 increased overhead in some places. If unsure say N here.
198 bool "SMT scheduler support"
201 Improves the CPU scheduler's decision making when dealing with
202 MultiThreading at a cost of slightly increased overhead in some
203 places. If unsure say N here.
205 config DISABLE_CPU_SCHED_DOMAIN_BALANCE
206 bool "(EXPERIMENTAL) Disable CPU level scheduler load-balancing"
208 Disables scheduler load-balancing at CPU sched domain level.
211 bool "(EXPERIMENTAL) Heterogenous multiprocessor scheduling"
212 depends on DISABLE_CPU_SCHED_DOMAIN_BALANCE && SCHED_MC && FAIR_GROUP_SCHED && !SCHED_AUTOGROUP
214 Experimental scheduler optimizations for heterogeneous platforms.
215 Attempts to introspectively select task affinity to optimize power
216 and performance. Basic support for multiple (>2) cpu types is in place,
217 but it has only been tested with two types of cpus.
218 There is currently no support for migration of task groups, hence
219 !SCHED_AUTOGROUP. Furthermore, normal load-balancing must be disabled
220 between cpus of different type (DISABLE_CPU_SCHED_DOMAIN_BALANCE).
222 config SCHED_HMP_PRIO_FILTER
223 bool "(EXPERIMENTAL) Filter HMP migrations by task priority"
226 Enables task priority based HMP migration filter. Any task with
227 a NICE value above the threshold will always be on low-power cpus
228 with less compute capacity.
230 config SCHED_HMP_PRIO_FILTER_VAL
231 int "NICE priority threshold"
233 depends on SCHED_HMP_PRIO_FILTER
235 config HMP_FAST_CPU_MASK
236 string "HMP scheduler fast CPU mask"
239 Leave empty to use device tree information.
240 Specify the cpuids of the fast CPUs in the system as a list string,
241 e.g. cpuid 0+1 should be specified as 0-1.
243 config HMP_SLOW_CPU_MASK
244 string "HMP scheduler slow CPU mask"
247 Leave empty to use device tree information.
248 Specify the cpuids of the slow CPUs in the system as a list string,
249 e.g. cpuid 0+1 should be specified as 0-1.
251 config HMP_VARIABLE_SCALE
252 bool "Allows changing the load tracking scale through sysfs"
255 When turned on, this option exports the thresholds and load average
256 period value for the load tracking patches through sysfs.
257 The values can be modified to change the rate of load accumulation
258 and the thresholds used for HMP migration.
259 The load_avg_period_ms is the time in ms to reach a load average of
260 0.5 for an idle task of 0 load average ratio that start a busy loop.
261 The up_threshold and down_threshold is the value to go to a faster
262 CPU or to go back to a slower cpu.
263 The {up,down}_threshold are devided by 1024 before being compared
265 For examples, with load_avg_period_ms = 128 and up_threshold = 512,
266 a running task with a load of 0 will be migrated to a bigger CPU after
267 128ms, because after 128ms its load_avg_ratio is 0.5 and the real
269 This patch has the same behavior as changing the Y of the load
270 average computation to
271 (1002/1024)^(LOAD_AVG_PERIOD/load_avg_period_ms)
272 but it remove intermadiate overflows in computation.
274 config HMP_FREQUENCY_INVARIANT_SCALE
275 bool "(EXPERIMENTAL) Frequency-Invariant Tracked Load for HMP"
276 depends on HMP_VARIABLE_SCALE && CPU_FREQ
278 Scales the current load contribution in line with the frequency
279 of the CPU that the task was executed on.
280 In this version, we use a simple linear scale derived from the
281 maximum frequency reported by CPUFreq.
282 Restricting tracked load to be scaled by the CPU's frequency
283 represents the consumption of possible compute capacity
284 (rather than consumption of actual instantaneous capacity as
285 normal) and allows the HMP migration's simple threshold
286 migration strategy to interact more predictably with CPUFreq's
287 asynchronous compute capacity changes.
289 config SCHED_HMP_LITTLE_PACKING
290 bool "Small task packing for HMP"
294 Allows the HMP Scheduler to pack small tasks into CPUs in the
296 Controlled by two sysfs files in sys/kernel/hmp.
297 packing_enable: 1 to enable, 0 to disable packing. Default 1.
298 packing_limit: runqueue load ratio where a RQ is considered
299 to be full. Default is NICE_0_LOAD * 9/8.
302 int "Maximum number of CPUs (2-32)"
305 # These have to remain sorted largest to smallest
309 bool "Support for hot-pluggable CPUs"
312 Say Y here to experiment with turning CPUs off and on. CPUs
313 can be controlled through /sys/devices/system/cpu.
316 bool "Emulate SWP/SWPB instructions"
318 ARMv6 architecture deprecates use of the SWP/SWPB instructions. ARMv8
319 oblosetes the use of SWP/SWPB instructions. ARMv7 multiprocessing
320 extensions introduce the ability to disable these instructions,
321 triggering an undefined instruction exception when executed. Say Y
322 here to enable software emulation of these instructions for userspace
323 (not kernel) using LDREX/STREX. Also creates /proc/cpu/swp_emulation
326 In some older versions of glibc [<=2.8] SWP is used during futex
327 trylock() operations with the assumption that the code will not
328 be preempted. This invalid assumption may be more likely to fail
329 with SWP emulation enabled, leading to deadlock of the user
332 NOTE: when accessing uncached shared regions, LDREX/STREX rely
333 on an external transaction monitoring block called a global
334 monitor to maintain update atomicity. If your system does not
335 implement a global monitor, this option can cause programs that
336 perform SWP operations to uncached memory to deadlock.
340 source kernel/Kconfig.preempt
346 config ARCH_HAS_HOLES_MEMORYMODEL
347 def_bool y if SPARSEMEM
349 config ARCH_SPARSEMEM_ENABLE
351 select SPARSEMEM_VMEMMAP_ENABLE
353 config ARCH_SPARSEMEM_DEFAULT
354 def_bool ARCH_SPARSEMEM_ENABLE
356 config ARCH_SELECT_MEMORY_MODEL
357 def_bool ARCH_SPARSEMEM_ENABLE
359 config HAVE_ARCH_PFN_VALID
360 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
362 config HW_PERF_EVENTS
363 bool "Enable hardware performance counter support for perf events"
364 depends on PERF_EVENTS
367 Enable hardware performance counter support for perf events. If
368 disabled, perf events will use software events only.
370 config SYS_SUPPORTS_HUGETLBFS
373 config ARCH_WANT_GENERAL_HUGETLB
376 config ARCH_WANT_HUGE_PMD_SHARE
377 def_bool y if !ARM64_64K_PAGES
379 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
383 bool "Kernel support for ARMv7 applications"
387 This option enables features that allow that ran on an ARMv7 or older
388 processor to continue functioning.
390 If you want to execute ARMv7 applications, say Y
392 config ARMV7_COMPAT_CPUINFO
393 bool "Report backwards compatible cpu features in /proc/cpuinfo"
394 depends on ARMV7_COMPAT
397 This option makes /proc/cpuinfo list CPU features that an ARMv7 or
398 earlier kernel would report, but are not optional on an ARMv8 or later
401 If you want to execute ARMv7 applications, say Y
405 config FORCE_MAX_ZONEORDER
407 default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
411 bool "Enable seccomp to safely compute untrusted bytecode"
413 This kernel feature is useful for number crunching applications
414 that may need to compute untrusted bytecode during their
415 execution. By using pipes or other transports made available to
416 the process as file descriptors supporting the read/write
417 syscalls, it's possible to isolate those applications in
418 their own address space using seccomp. Once seccomp is
419 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
420 and the task is only allowed to execute a few safe syscalls
421 defined by each seccomp mode.
428 string "Default kernel command string"
431 Provide a set of default command-line options at build time by
432 entering them here. As a minimum, you should specify the the
433 root device (e.g. root=/dev/nfs).
436 prompt "Kernel command line type" if CMDLINE != ""
437 default CMDLINE_FROM_BOOTLOADER
439 config CMDLINE_FROM_BOOTLOADER
440 bool "Use bootloader kernel arguments if available"
442 Uses the command-line options passed by the boot loader. If
443 the boot loader doesn't provide any, the default kernel command
444 string provided in CMDLINE will be used.
446 config CMDLINE_EXTEND
447 bool "Extend bootloader kernel arguments"
449 The command-line arguments provided by the boot loader will be
450 appended to the default kernel command string.
453 bool "Always use the default kernel command string"
455 Always use the default kernel command string, even if the boot
456 loader passes other arguments to the kernel.
457 This is useful if you cannot or don't want to change the
458 command-line options your boot loader passes to the kernel.
461 config BUILD_ARM64_APPENDED_DTB_IMAGE
462 bool "Build a concatenated Image.gz/dtb by default"
465 Enabling this option will cause a concatenated Image.gz and list of
466 DTBs to be built by default (instead of a standalone Image.gz.)
467 The image will built in arch/arm64/boot/Image.gz-dtb
469 config BUILD_ARM64_APPENDED_DTB_IMAGE_NAMES
470 string "Default dtb names"
471 depends on BUILD_ARM64_APPENDED_DTB_IMAGE
473 Space separated list of names of dtbs to append when
474 building a concatenated Image.gz-dtb.
477 bool "UEFI runtime support"
478 depends on OF && !CPU_BIG_ENDIAN
481 select EFI_PARAMS_FROM_FDT
484 This option provides support for runtime services provided
485 by UEFI firmware (such as non-volatile variables, realtime
486 clock, and platform reset). A UEFI stub is also provided to
487 allow the kernel to be booted as an EFI application. This
488 is only useful on systems that have UEFI firmware.
492 menu "Userspace binary formats"
494 source "fs/Kconfig.binfmt"
497 bool "Kernel support for 32-bit EL0"
498 depends on !ARM64_64K_PAGES
499 select COMPAT_BINFMT_ELF
501 select OLD_SIGSUSPEND3
502 select COMPAT_OLD_SIGACTION
504 This option enables support for a 32-bit EL0 running under a 64-bit
505 kernel at EL1. AArch32-specific components such as system calls,
506 the user helper functions, VFP support and the ptrace interface are
507 handled appropriately by the kernel.
509 If you want to execute 32-bit userspace applications, say Y.
511 config SYSVIPC_COMPAT
513 depends on COMPAT && SYSVIPC
517 menu "Power management options"
519 source "kernel/power/Kconfig"
521 source "drivers/cpufreq/Kconfig"
522 config ARCH_SUSPEND_POSSIBLE
525 config ARM64_CPU_SUSPEND
530 menu "CPU Power Management"
532 source "drivers/cpuidle/Kconfig"
538 source "drivers/Kconfig"
540 source "drivers/firmware/Kconfig"
544 source "arch/arm64/kvm/Kconfig"
546 source "arch/arm64/Kconfig.debug"
548 source "security/Kconfig"
550 source "crypto/Kconfig"
552 source "arch/arm64/crypto/Kconfig"