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_CLOCKEVENTS
23 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
24 select GENERIC_CPU_AUTOPROBE
25 select GENERIC_EARLY_IOREMAP
27 select GENERIC_IRQ_PROBE
28 select GENERIC_IRQ_SHOW
29 select GENERIC_SMP_IDLE_THREAD
30 select GENERIC_STRNCPY_FROM_USER
31 select GENERIC_STRNLEN_USER
32 select GENERIC_TIME_VSYSCALL
33 select HARDIRQS_SW_RESEND
34 select HAVE_ARCH_JUMP_LABEL
36 select HAVE_ARCH_AUDITSYSCALL
37 select HAVE_ARCH_SECCOMP_FILTER
38 select HAVE_ARCH_TRACEHOOK
39 select HAVE_C_RECORDMCOUNT
40 select HAVE_CC_STACKPROTECTOR
41 select HAVE_DEBUG_BUGVERBOSE
42 select HAVE_DEBUG_KMEMLEAK
43 select HAVE_DMA_API_DEBUG
45 select HAVE_DMA_CONTIGUOUS
46 select HAVE_DYNAMIC_FTRACE
47 select HAVE_EFFICIENT_UNALIGNED_ACCESS
48 select HAVE_FTRACE_MCOUNT_RECORD
49 select HAVE_FUNCTION_TRACER
50 select HAVE_FUNCTION_GRAPH_TRACER
51 select HAVE_GENERIC_DMA_COHERENT
52 select HAVE_GENERIC_HARDIRQS
53 select HAVE_HW_BREAKPOINT if PERF_EVENTS
55 select HAVE_PATA_PLATFORM
56 select HAVE_PERF_EVENTS
58 select HAVE_PERF_USER_STACK_DUMP
59 select HAVE_SYSCALL_TRACEPOINTS
61 select MODULES_USE_ELF_RELA
64 select OF_EARLY_FLATTREE
65 select OF_RESERVED_MEM
66 select PERF_USE_VMALLOC
71 select SYSCTL_EXCEPTION_TRACE
73 ARM 64-bit (AArch64) Linux support.
78 config ARCH_PHYS_ADDR_T_64BIT
87 config STACKTRACE_SUPPORT
90 config LOCKDEP_SUPPORT
93 config TRACE_IRQFLAGS_SUPPORT
96 config RWSEM_XCHGADD_ALGORITHM
99 config GENERIC_HWEIGHT
105 config GENERIC_CALIBRATE_DELAY
111 config ARCH_DMA_ADDR_T_64BIT
114 config NEED_DMA_MAP_STATE
117 config NEED_SG_DMA_LENGTH
126 config FIX_EARLYCON_MEM
129 source "init/Kconfig"
131 source "kernel/Kconfig.freezer"
133 menu "Platform selection"
136 bool "ARMv8 software model (Versatile Express)"
137 select ARCH_REQUIRE_GPIOLIB
138 select COMMON_CLK_VERSATILE
139 select POWER_RESET_VEXPRESS
140 select VEXPRESS_CONFIG
142 This enables support for the ARMv8 software model (Versatile
146 bool "AppliedMicro X-Gene SOC Family"
148 This enables support for AppliedMicro X-Gene SOC Family
159 menu "Kernel Features"
161 config ARM64_64K_PAGES
162 bool "Enable 64KB pages support"
164 This feature enables 64KB pages support (4KB by default)
165 allowing only two levels of page tables and faster TLB
166 look-up. AArch32 emulation is not available when this feature
169 config CPU_BIG_ENDIAN
170 bool "Build big-endian kernel"
172 Say Y if you plan on running a kernel in big-endian mode.
175 bool "Symmetric Multi-Processing"
176 select USE_GENERIC_SMP_HELPERS
178 This enables support for systems with more than one CPU. If
179 you say N here, the kernel will run on single and
180 multiprocessor machines, but will use only one CPU of a
181 multiprocessor machine. If you say Y here, the kernel will run
182 on many, but not all, single processor machines. On a single
183 processor machine, the kernel will run faster if you say N
186 If you don't know what to do here, say N.
189 bool "Multi-core scheduler support"
192 Multi-core scheduler support improves the CPU scheduler's decision
193 making when dealing with multi-core CPU chips at a cost of slightly
194 increased overhead in some places. If unsure say N here.
197 bool "SMT scheduler support"
200 Improves the CPU scheduler's decision making when dealing with
201 MultiThreading at a cost of slightly increased overhead in some
202 places. If unsure say N here.
204 config DISABLE_CPU_SCHED_DOMAIN_BALANCE
205 bool "(EXPERIMENTAL) Disable CPU level scheduler load-balancing"
207 Disables scheduler load-balancing at CPU sched domain level.
210 bool "(EXPERIMENTAL) Heterogenous multiprocessor scheduling"
211 depends on DISABLE_CPU_SCHED_DOMAIN_BALANCE && SCHED_MC && FAIR_GROUP_SCHED && !SCHED_AUTOGROUP
213 Experimental scheduler optimizations for heterogeneous platforms.
214 Attempts to introspectively select task affinity to optimize power
215 and performance. Basic support for multiple (>2) cpu types is in place,
216 but it has only been tested with two types of cpus.
217 There is currently no support for migration of task groups, hence
218 !SCHED_AUTOGROUP. Furthermore, normal load-balancing must be disabled
219 between cpus of different type (DISABLE_CPU_SCHED_DOMAIN_BALANCE).
221 config SCHED_HMP_PRIO_FILTER
222 bool "(EXPERIMENTAL) Filter HMP migrations by task priority"
225 Enables task priority based HMP migration filter. Any task with
226 a NICE value above the threshold will always be on low-power cpus
227 with less compute capacity.
229 config SCHED_HMP_PRIO_FILTER_VAL
230 int "NICE priority threshold"
232 depends on SCHED_HMP_PRIO_FILTER
234 config HMP_FAST_CPU_MASK
235 string "HMP scheduler fast CPU mask"
238 Leave empty to use device tree information.
239 Specify the cpuids of the fast CPUs in the system as a list string,
240 e.g. cpuid 0+1 should be specified as 0-1.
242 config HMP_SLOW_CPU_MASK
243 string "HMP scheduler slow CPU mask"
246 Leave empty to use device tree information.
247 Specify the cpuids of the slow CPUs in the system as a list string,
248 e.g. cpuid 0+1 should be specified as 0-1.
250 config HMP_VARIABLE_SCALE
251 bool "Allows changing the load tracking scale through sysfs"
254 When turned on, this option exports the thresholds and load average
255 period value for the load tracking patches through sysfs.
256 The values can be modified to change the rate of load accumulation
257 and the thresholds used for HMP migration.
258 The load_avg_period_ms is the time in ms to reach a load average of
259 0.5 for an idle task of 0 load average ratio that start a busy loop.
260 The up_threshold and down_threshold is the value to go to a faster
261 CPU or to go back to a slower cpu.
262 The {up,down}_threshold are devided by 1024 before being compared
264 For examples, with load_avg_period_ms = 128 and up_threshold = 512,
265 a running task with a load of 0 will be migrated to a bigger CPU after
266 128ms, because after 128ms its load_avg_ratio is 0.5 and the real
268 This patch has the same behavior as changing the Y of the load
269 average computation to
270 (1002/1024)^(LOAD_AVG_PERIOD/load_avg_period_ms)
271 but it remove intermadiate overflows in computation.
273 config HMP_FREQUENCY_INVARIANT_SCALE
274 bool "(EXPERIMENTAL) Frequency-Invariant Tracked Load for HMP"
275 depends on HMP_VARIABLE_SCALE && CPU_FREQ
277 Scales the current load contribution in line with the frequency
278 of the CPU that the task was executed on.
279 In this version, we use a simple linear scale derived from the
280 maximum frequency reported by CPUFreq.
281 Restricting tracked load to be scaled by the CPU's frequency
282 represents the consumption of possible compute capacity
283 (rather than consumption of actual instantaneous capacity as
284 normal) and allows the HMP migration's simple threshold
285 migration strategy to interact more predictably with CPUFreq's
286 asynchronous compute capacity changes.
288 config SCHED_HMP_LITTLE_PACKING
289 bool "Small task packing for HMP"
293 Allows the HMP Scheduler to pack small tasks into CPUs in the
295 Controlled by two sysfs files in sys/kernel/hmp.
296 packing_enable: 1 to enable, 0 to disable packing. Default 1.
297 packing_limit: runqueue load ratio where a RQ is considered
298 to be full. Default is NICE_0_LOAD * 9/8.
301 int "Maximum number of CPUs (2-32)"
304 # These have to remain sorted largest to smallest
308 bool "Support for hot-pluggable CPUs"
311 Say Y here to experiment with turning CPUs off and on. CPUs
312 can be controlled through /sys/devices/system/cpu.
315 bool "Emulate SWP/SWPB instructions"
317 ARMv6 architecture deprecates use of the SWP/SWPB instructions. ARMv8
318 oblosetes the use of SWP/SWPB instructions. ARMv7 multiprocessing
319 extensions introduce the ability to disable these instructions,
320 triggering an undefined instruction exception when executed. Say Y
321 here to enable software emulation of these instructions for userspace
322 (not kernel) using LDREX/STREX. Also creates /proc/cpu/swp_emulation
325 In some older versions of glibc [<=2.8] SWP is used during futex
326 trylock() operations with the assumption that the code will not
327 be preempted. This invalid assumption may be more likely to fail
328 with SWP emulation enabled, leading to deadlock of the user
331 NOTE: when accessing uncached shared regions, LDREX/STREX rely
332 on an external transaction monitoring block called a global
333 monitor to maintain update atomicity. If your system does not
334 implement a global monitor, this option can cause programs that
335 perform SWP operations to uncached memory to deadlock.
339 source kernel/Kconfig.preempt
345 config ARCH_HAS_HOLES_MEMORYMODEL
346 def_bool y if SPARSEMEM
348 config ARCH_SPARSEMEM_ENABLE
350 select SPARSEMEM_VMEMMAP_ENABLE
352 config ARCH_SPARSEMEM_DEFAULT
353 def_bool ARCH_SPARSEMEM_ENABLE
355 config ARCH_SELECT_MEMORY_MODEL
356 def_bool ARCH_SPARSEMEM_ENABLE
358 config HAVE_ARCH_PFN_VALID
359 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
361 config HW_PERF_EVENTS
362 bool "Enable hardware performance counter support for perf events"
363 depends on PERF_EVENTS
366 Enable hardware performance counter support for perf events. If
367 disabled, perf events will use software events only.
369 config SYS_SUPPORTS_HUGETLBFS
372 config ARCH_WANT_GENERAL_HUGETLB
375 config ARCH_WANT_HUGE_PMD_SHARE
376 def_bool y if !ARM64_64K_PAGES
378 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
382 bool "Kernel support for ARMv7 applications"
386 This option enables features that allow that ran on an ARMv7 or older
387 processor to continue functioning.
389 If you want to execute ARMv7 applications, say Y
391 config ARMV7_COMPAT_CPUINFO
392 bool "Report backwards compatible cpu features in /proc/cpuinfo"
393 depends on ARMV7_COMPAT
396 This option makes /proc/cpuinfo list CPU features that an ARMv7 or
397 earlier kernel would report, but are not optional on an ARMv8 or later
400 If you want to execute ARMv7 applications, say Y
404 config FORCE_MAX_ZONEORDER
406 default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
410 bool "Enable seccomp to safely compute untrusted bytecode"
412 This kernel feature is useful for number crunching applications
413 that may need to compute untrusted bytecode during their
414 execution. By using pipes or other transports made available to
415 the process as file descriptors supporting the read/write
416 syscalls, it's possible to isolate those applications in
417 their own address space using seccomp. Once seccomp is
418 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
419 and the task is only allowed to execute a few safe syscalls
420 defined by each seccomp mode.
427 string "Default kernel command string"
430 Provide a set of default command-line options at build time by
431 entering them here. As a minimum, you should specify the the
432 root device (e.g. root=/dev/nfs).
435 prompt "Kernel command line type" if CMDLINE != ""
436 default CMDLINE_FROM_BOOTLOADER
438 config CMDLINE_FROM_BOOTLOADER
439 bool "Use bootloader kernel arguments if available"
441 Uses the command-line options passed by the boot loader. If
442 the boot loader doesn't provide any, the default kernel command
443 string provided in CMDLINE will be used.
445 config CMDLINE_EXTEND
446 bool "Extend bootloader kernel arguments"
448 The command-line arguments provided by the boot loader will be
449 appended to the default kernel command string.
452 bool "Always use the default kernel command string"
454 Always use the default kernel command string, even if the boot
455 loader passes other arguments to the kernel.
456 This is useful if you cannot or don't want to change the
457 command-line options your boot loader passes to the kernel.
460 config BUILD_ARM64_APPENDED_DTB_IMAGE
461 bool "Build a concatenated Image.gz/dtb by default"
464 Enabling this option will cause a concatenated Image.gz and list of
465 DTBs to be built by default (instead of a standalone Image.gz.)
466 The image will built in arch/arm64/boot/Image.gz-dtb
468 config BUILD_ARM64_APPENDED_DTB_IMAGE_NAMES
469 string "Default dtb names"
470 depends on BUILD_ARM64_APPENDED_DTB_IMAGE
472 Space separated list of names of dtbs to append when
473 building a concatenated Image.gz-dtb.
476 bool "UEFI runtime support"
477 depends on OF && !CPU_BIG_ENDIAN
480 select EFI_PARAMS_FROM_FDT
483 This option provides support for runtime services provided
484 by UEFI firmware (such as non-volatile variables, realtime
485 clock, and platform reset). A UEFI stub is also provided to
486 allow the kernel to be booted as an EFI application. This
487 is only useful on systems that have UEFI firmware.
491 menu "Userspace binary formats"
493 source "fs/Kconfig.binfmt"
496 bool "Kernel support for 32-bit EL0"
497 depends on !ARM64_64K_PAGES
498 select COMPAT_BINFMT_ELF
500 select OLD_SIGSUSPEND3
501 select COMPAT_OLD_SIGACTION
503 This option enables support for a 32-bit EL0 running under a 64-bit
504 kernel at EL1. AArch32-specific components such as system calls,
505 the user helper functions, VFP support and the ptrace interface are
506 handled appropriately by the kernel.
508 If you want to execute 32-bit userspace applications, say Y.
510 config SYSVIPC_COMPAT
512 depends on COMPAT && SYSVIPC
516 menu "Power management options"
518 source "kernel/power/Kconfig"
520 source "drivers/cpufreq/Kconfig"
521 config ARCH_SUSPEND_POSSIBLE
524 config ARM64_CPU_SUSPEND
529 menu "CPU Power Management"
531 source "drivers/cpuidle/Kconfig"
537 source "drivers/Kconfig"
539 source "drivers/firmware/Kconfig"
543 source "arch/arm64/kvm/Kconfig"
545 source "arch/arm64/Kconfig.debug"
547 source "security/Kconfig"
549 source "crypto/Kconfig"
551 source "arch/arm64/crypto/Kconfig"