3 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
4 select ARCH_USE_CMPXCHG_LOCKREF
6 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
7 select ARCH_SUPPORTS_ATOMIC_RMW
8 select ARCH_WANT_OPTIONAL_GPIOLIB
9 select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
10 select ARCH_WANT_FRAME_POINTERS
15 select BUILDTIME_EXTABLE_SORT
16 select AUDIT_ARCH_COMPAT_GENERIC
17 select CLONE_BACKWARDS
19 select CPU_PM if (SUSPEND || CPU_IDLE)
20 select DCACHE_WORD_ACCESS
21 select GENERIC_CLOCKEVENTS
22 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
23 select GENERIC_CPU_AUTOPROBE
24 select GENERIC_EARLY_IOREMAP
26 select GENERIC_IRQ_PROBE
27 select GENERIC_IRQ_SHOW
28 select GENERIC_SMP_IDLE_THREAD
29 select GENERIC_STRNCPY_FROM_USER
30 select GENERIC_STRNLEN_USER
31 select GENERIC_TIME_VSYSCALL
32 select HARDIRQS_SW_RESEND
33 select HAVE_ARCH_JUMP_LABEL
35 select HAVE_ARCH_AUDITSYSCALL
36 select HAVE_ARCH_SECCOMP_FILTER
37 select HAVE_ARCH_TRACEHOOK
38 select HAVE_C_RECORDMCOUNT
39 select HAVE_DEBUG_BUGVERBOSE
40 select HAVE_DEBUG_KMEMLEAK
41 select HAVE_DMA_API_DEBUG
43 select HAVE_DMA_CONTIGUOUS
44 select HAVE_DYNAMIC_FTRACE
45 select HAVE_EFFICIENT_UNALIGNED_ACCESS
46 select HAVE_FTRACE_MCOUNT_RECORD
47 select HAVE_FUNCTION_TRACER
48 select HAVE_FUNCTION_GRAPH_TRACER
49 select HAVE_GENERIC_DMA_COHERENT
50 select HAVE_GENERIC_HARDIRQS
51 select HAVE_HW_BREAKPOINT if PERF_EVENTS
53 select HAVE_PATA_PLATFORM
54 select HAVE_PERF_EVENTS
56 select HAVE_PERF_USER_STACK_DUMP
57 select HAVE_SYSCALL_TRACEPOINTS
59 select MODULES_USE_ELF_RELA
62 select OF_EARLY_FLATTREE
63 select OF_RESERVED_MEM
64 select PERF_USE_VMALLOC
69 select SYSCTL_EXCEPTION_TRACE
71 ARM 64-bit (AArch64) Linux support.
76 config ARCH_PHYS_ADDR_T_64BIT
85 config STACKTRACE_SUPPORT
88 config LOCKDEP_SUPPORT
91 config TRACE_IRQFLAGS_SUPPORT
94 config RWSEM_XCHGADD_ALGORITHM
97 config GENERIC_HWEIGHT
103 config GENERIC_CALIBRATE_DELAY
109 config ARCH_DMA_ADDR_T_64BIT
112 config NEED_DMA_MAP_STATE
115 config NEED_SG_DMA_LENGTH
124 config FIX_EARLYCON_MEM
127 source "init/Kconfig"
129 source "kernel/Kconfig.freezer"
131 menu "Platform selection"
134 bool "ARMv8 software model (Versatile Express)"
135 select ARCH_REQUIRE_GPIOLIB
136 select COMMON_CLK_VERSATILE
137 select POWER_RESET_VEXPRESS
138 select VEXPRESS_CONFIG
140 This enables support for the ARMv8 software model (Versatile
144 bool "AppliedMicro X-Gene SOC Family"
146 This enables support for AppliedMicro X-Gene SOC Family
157 menu "Kernel Features"
159 config ARM64_64K_PAGES
160 bool "Enable 64KB pages support"
162 This feature enables 64KB pages support (4KB by default)
163 allowing only two levels of page tables and faster TLB
164 look-up. AArch32 emulation is not available when this feature
167 config CPU_BIG_ENDIAN
168 bool "Build big-endian kernel"
170 Say Y if you plan on running a kernel in big-endian mode.
173 bool "Symmetric Multi-Processing"
174 select USE_GENERIC_SMP_HELPERS
176 This enables support for systems with more than one CPU. If
177 you say N here, the kernel will run on single and
178 multiprocessor machines, but will use only one CPU of a
179 multiprocessor machine. If you say Y here, the kernel will run
180 on many, but not all, single processor machines. On a single
181 processor machine, the kernel will run faster if you say N
184 If you don't know what to do here, say N.
187 bool "Multi-core scheduler support"
190 Multi-core scheduler support improves the CPU scheduler's decision
191 making when dealing with multi-core CPU chips at a cost of slightly
192 increased overhead in some places. If unsure say N here.
195 bool "SMT scheduler support"
198 Improves the CPU scheduler's decision making when dealing with
199 MultiThreading at a cost of slightly increased overhead in some
200 places. If unsure say N here.
202 config DISABLE_CPU_SCHED_DOMAIN_BALANCE
203 bool "(EXPERIMENTAL) Disable CPU level scheduler load-balancing"
205 Disables scheduler load-balancing at CPU sched domain level.
208 bool "(EXPERIMENTAL) Heterogenous multiprocessor scheduling"
209 depends on DISABLE_CPU_SCHED_DOMAIN_BALANCE && SCHED_MC && FAIR_GROUP_SCHED && !SCHED_AUTOGROUP
211 Experimental scheduler optimizations for heterogeneous platforms.
212 Attempts to introspectively select task affinity to optimize power
213 and performance. Basic support for multiple (>2) cpu types is in place,
214 but it has only been tested with two types of cpus.
215 There is currently no support for migration of task groups, hence
216 !SCHED_AUTOGROUP. Furthermore, normal load-balancing must be disabled
217 between cpus of different type (DISABLE_CPU_SCHED_DOMAIN_BALANCE).
219 config SCHED_HMP_PRIO_FILTER
220 bool "(EXPERIMENTAL) Filter HMP migrations by task priority"
223 Enables task priority based HMP migration filter. Any task with
224 a NICE value above the threshold will always be on low-power cpus
225 with less compute capacity.
227 config SCHED_HMP_PRIO_FILTER_VAL
228 int "NICE priority threshold"
230 depends on SCHED_HMP_PRIO_FILTER
232 config HMP_FAST_CPU_MASK
233 string "HMP scheduler fast CPU mask"
236 Leave empty to use device tree information.
237 Specify the cpuids of the fast CPUs in the system as a list string,
238 e.g. cpuid 0+1 should be specified as 0-1.
240 config HMP_SLOW_CPU_MASK
241 string "HMP scheduler slow CPU mask"
244 Leave empty to use device tree information.
245 Specify the cpuids of the slow CPUs in the system as a list string,
246 e.g. cpuid 0+1 should be specified as 0-1.
248 config HMP_VARIABLE_SCALE
249 bool "Allows changing the load tracking scale through sysfs"
252 When turned on, this option exports the thresholds and load average
253 period value for the load tracking patches through sysfs.
254 The values can be modified to change the rate of load accumulation
255 and the thresholds used for HMP migration.
256 The load_avg_period_ms is the time in ms to reach a load average of
257 0.5 for an idle task of 0 load average ratio that start a busy loop.
258 The up_threshold and down_threshold is the value to go to a faster
259 CPU or to go back to a slower cpu.
260 The {up,down}_threshold are devided by 1024 before being compared
262 For examples, with load_avg_period_ms = 128 and up_threshold = 512,
263 a running task with a load of 0 will be migrated to a bigger CPU after
264 128ms, because after 128ms its load_avg_ratio is 0.5 and the real
266 This patch has the same behavior as changing the Y of the load
267 average computation to
268 (1002/1024)^(LOAD_AVG_PERIOD/load_avg_period_ms)
269 but it remove intermadiate overflows in computation.
271 config HMP_FREQUENCY_INVARIANT_SCALE
272 bool "(EXPERIMENTAL) Frequency-Invariant Tracked Load for HMP"
273 depends on HMP_VARIABLE_SCALE && CPU_FREQ
275 Scales the current load contribution in line with the frequency
276 of the CPU that the task was executed on.
277 In this version, we use a simple linear scale derived from the
278 maximum frequency reported by CPUFreq.
279 Restricting tracked load to be scaled by the CPU's frequency
280 represents the consumption of possible compute capacity
281 (rather than consumption of actual instantaneous capacity as
282 normal) and allows the HMP migration's simple threshold
283 migration strategy to interact more predictably with CPUFreq's
284 asynchronous compute capacity changes.
286 config SCHED_HMP_LITTLE_PACKING
287 bool "Small task packing for HMP"
291 Allows the HMP Scheduler to pack small tasks into CPUs in the
293 Controlled by two sysfs files in sys/kernel/hmp.
294 packing_enable: 1 to enable, 0 to disable packing. Default 1.
295 packing_limit: runqueue load ratio where a RQ is considered
296 to be full. Default is NICE_0_LOAD * 9/8.
299 int "Maximum number of CPUs (2-32)"
302 # These have to remain sorted largest to smallest
306 bool "Support for hot-pluggable CPUs"
309 Say Y here to experiment with turning CPUs off and on. CPUs
310 can be controlled through /sys/devices/system/cpu.
313 bool "Emulate SWP/SWPB instructions"
315 ARMv6 architecture deprecates use of the SWP/SWPB instructions. ARMv8
316 oblosetes the use of SWP/SWPB instructions. ARMv7 multiprocessing
317 extensions introduce the ability to disable these instructions,
318 triggering an undefined instruction exception when executed. Say Y
319 here to enable software emulation of these instructions for userspace
320 (not kernel) using LDREX/STREX. Also creates /proc/cpu/swp_emulation
323 In some older versions of glibc [<=2.8] SWP is used during futex
324 trylock() operations with the assumption that the code will not
325 be preempted. This invalid assumption may be more likely to fail
326 with SWP emulation enabled, leading to deadlock of the user
329 NOTE: when accessing uncached shared regions, LDREX/STREX rely
330 on an external transaction monitoring block called a global
331 monitor to maintain update atomicity. If your system does not
332 implement a global monitor, this option can cause programs that
333 perform SWP operations to uncached memory to deadlock.
337 source kernel/Kconfig.preempt
343 config ARCH_HAS_HOLES_MEMORYMODEL
344 def_bool y if SPARSEMEM
346 config ARCH_SPARSEMEM_ENABLE
348 select SPARSEMEM_VMEMMAP_ENABLE
350 config ARCH_SPARSEMEM_DEFAULT
351 def_bool ARCH_SPARSEMEM_ENABLE
353 config ARCH_SELECT_MEMORY_MODEL
354 def_bool ARCH_SPARSEMEM_ENABLE
356 config HAVE_ARCH_PFN_VALID
357 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
359 config HW_PERF_EVENTS
360 bool "Enable hardware performance counter support for perf events"
361 depends on PERF_EVENTS
364 Enable hardware performance counter support for perf events. If
365 disabled, perf events will use software events only.
367 config SYS_SUPPORTS_HUGETLBFS
370 config ARCH_WANT_GENERAL_HUGETLB
373 config ARCH_WANT_HUGE_PMD_SHARE
374 def_bool y if !ARM64_64K_PAGES
376 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
380 bool "Kernel support for ARMv7 applications"
384 This option enables features that allow that ran on an ARMv7 or older
385 processor to continue functioning.
387 If you want to execute ARMv7 applications, say Y
389 config ARMV7_COMPAT_CPUINFO
390 bool "Report backwards compatible cpu features in /proc/cpuinfo"
391 depends on ARMV7_COMPAT
394 This option makes /proc/cpuinfo list CPU features that an ARMv7 or
395 earlier kernel would report, but are not optional on an ARMv8 or later
398 If you want to execute ARMv7 applications, say Y
402 config FORCE_MAX_ZONEORDER
404 default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
408 bool "Enable seccomp to safely compute untrusted bytecode"
410 This kernel feature is useful for number crunching applications
411 that may need to compute untrusted bytecode during their
412 execution. By using pipes or other transports made available to
413 the process as file descriptors supporting the read/write
414 syscalls, it's possible to isolate those applications in
415 their own address space using seccomp. Once seccomp is
416 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
417 and the task is only allowed to execute a few safe syscalls
418 defined by each seccomp mode.
425 string "Default kernel command string"
428 Provide a set of default command-line options at build time by
429 entering them here. As a minimum, you should specify the the
430 root device (e.g. root=/dev/nfs).
433 prompt "Kernel command line type" if CMDLINE != ""
434 default CMDLINE_FROM_BOOTLOADER
436 config CMDLINE_FROM_BOOTLOADER
437 bool "Use bootloader kernel arguments if available"
439 Uses the command-line options passed by the boot loader. If
440 the boot loader doesn't provide any, the default kernel command
441 string provided in CMDLINE will be used.
443 config CMDLINE_EXTEND
444 bool "Extend bootloader kernel arguments"
446 The command-line arguments provided by the boot loader will be
447 appended to the default kernel command string.
450 bool "Always use the default kernel command string"
452 Always use the default kernel command string, even if the boot
453 loader passes other arguments to the kernel.
454 This is useful if you cannot or don't want to change the
455 command-line options your boot loader passes to the kernel.
458 config BUILD_ARM64_APPENDED_DTB_IMAGE
459 bool "Build a concatenated Image.gz/dtb by default"
462 Enabling this option will cause a concatenated Image.gz and list of
463 DTBs to be built by default (instead of a standalone Image.gz.)
464 The image will built in arch/arm64/boot/Image.gz-dtb
466 config BUILD_ARM64_APPENDED_DTB_IMAGE_NAMES
467 string "Default dtb names"
468 depends on BUILD_ARM64_APPENDED_DTB_IMAGE
470 Space separated list of names of dtbs to append when
471 building a concatenated Image.gz-dtb.
474 bool "UEFI runtime support"
475 depends on OF && !CPU_BIG_ENDIAN
478 select EFI_PARAMS_FROM_FDT
481 This option provides support for runtime services provided
482 by UEFI firmware (such as non-volatile variables, realtime
483 clock, and platform reset). A UEFI stub is also provided to
484 allow the kernel to be booted as an EFI application. This
485 is only useful on systems that have UEFI firmware.
489 menu "Userspace binary formats"
491 source "fs/Kconfig.binfmt"
494 bool "Kernel support for 32-bit EL0"
495 depends on !ARM64_64K_PAGES
496 select COMPAT_BINFMT_ELF
498 select OLD_SIGSUSPEND3
499 select COMPAT_OLD_SIGACTION
501 This option enables support for a 32-bit EL0 running under a 64-bit
502 kernel at EL1. AArch32-specific components such as system calls,
503 the user helper functions, VFP support and the ptrace interface are
504 handled appropriately by the kernel.
506 If you want to execute 32-bit userspace applications, say Y.
508 config SYSVIPC_COMPAT
510 depends on COMPAT && SYSVIPC
514 menu "Power management options"
516 source "kernel/power/Kconfig"
518 source "drivers/cpufreq/Kconfig"
519 config ARCH_SUSPEND_POSSIBLE
522 config ARM64_CPU_SUSPEND
527 menu "CPU Power Management"
529 source "drivers/cpuidle/Kconfig"
535 source "drivers/Kconfig"
537 source "drivers/firmware/Kconfig"
541 source "arch/arm64/kvm/Kconfig"
543 source "arch/arm64/Kconfig.debug"
545 source "security/Kconfig"
547 source "crypto/Kconfig"
549 source "arch/arm64/crypto/Kconfig"