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_HAS_GCOV_PROFILE_ALL
10 select ARCH_WANT_OPTIONAL_GPIOLIB
11 select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
12 select ARCH_WANT_FRAME_POINTERS
17 select BUILDTIME_EXTABLE_SORT
18 select AUDIT_ARCH_COMPAT_GENERIC
19 select CLONE_BACKWARDS
21 select CPU_PM if (SUSPEND || CPU_IDLE)
22 select DCACHE_WORD_ACCESS
23 select GENERIC_ALLOCATOR
24 select GENERIC_CLOCKEVENTS
25 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
26 select GENERIC_CPU_AUTOPROBE
27 select GENERIC_EARLY_IOREMAP
29 select GENERIC_IRQ_PROBE
30 select GENERIC_IRQ_SHOW
31 select GENERIC_SMP_IDLE_THREAD
32 select GENERIC_STRNCPY_FROM_USER
33 select GENERIC_STRNLEN_USER
34 select GENERIC_TIME_VSYSCALL
35 select HARDIRQS_SW_RESEND
36 select HAVE_ARCH_JUMP_LABEL
38 select HAVE_ARCH_AUDITSYSCALL
39 select HAVE_ARCH_SECCOMP_FILTER
40 select HAVE_ARCH_TRACEHOOK
41 select HAVE_C_RECORDMCOUNT
42 select HAVE_CC_STACKPROTECTOR
43 select HAVE_DEBUG_BUGVERBOSE
44 select HAVE_DEBUG_KMEMLEAK
45 select HAVE_DMA_API_DEBUG
47 select HAVE_DMA_CONTIGUOUS
48 select HAVE_DYNAMIC_FTRACE
49 select HAVE_EFFICIENT_UNALIGNED_ACCESS
50 select HAVE_FTRACE_MCOUNT_RECORD
51 select HAVE_FUNCTION_TRACER
52 select HAVE_FUNCTION_GRAPH_TRACER
53 select HAVE_GENERIC_DMA_COHERENT
54 select HAVE_GENERIC_HARDIRQS
55 select HAVE_HW_BREAKPOINT if PERF_EVENTS
57 select HAVE_PATA_PLATFORM
58 select HAVE_PERF_EVENTS
60 select HAVE_PERF_USER_STACK_DUMP
61 select HAVE_SYSCALL_TRACEPOINTS
63 select MODULES_USE_ELF_RELA
66 select OF_EARLY_FLATTREE
67 select OF_RESERVED_MEM
68 select PERF_USE_VMALLOC
73 select SYSCTL_EXCEPTION_TRACE
75 ARM 64-bit (AArch64) Linux support.
80 config ARCH_PHYS_ADDR_T_64BIT
89 config STACKTRACE_SUPPORT
92 config LOCKDEP_SUPPORT
95 config TRACE_IRQFLAGS_SUPPORT
98 config RWSEM_XCHGADD_ALGORITHM
101 config GENERIC_HWEIGHT
107 config GENERIC_CALIBRATE_DELAY
113 config ARCH_DMA_ADDR_T_64BIT
116 config NEED_DMA_MAP_STATE
119 config NEED_SG_DMA_LENGTH
128 config FIX_EARLYCON_MEM
131 source "init/Kconfig"
133 source "kernel/Kconfig.freezer"
135 menu "Platform selection"
140 select PINCTRL_RK3368
141 select ARCH_REQUIRE_GPIOLIB
143 source "arch/arm64/mach-rockchip/Kconfig"
146 bool "ARMv8 software model (Versatile Express)"
147 select ARCH_REQUIRE_GPIOLIB
148 select COMMON_CLK_VERSATILE
149 select POWER_RESET_VEXPRESS
150 select VEXPRESS_CONFIG
152 This enables support for the ARMv8 software model (Versatile
156 bool "AppliedMicro X-Gene SOC Family"
158 This enables support for AppliedMicro X-Gene SOC Family
169 menu "Kernel Features"
171 menu "ARM errata workarounds"
173 config ARM64_ERRATUM_845719
174 bool "Cortex-A53: 845719: a load might read incorrect data"
178 This option adds an alternative code sequence to work around ARM
179 erratum 845719 on Cortex-A53 parts up to r0p4.
181 When running a compat (AArch32) userspace on an affected Cortex-A53
182 part, a load at EL0 from a virtual address that matches the bottom 32
183 bits of the virtual address used by a recent load at (AArch64) EL1
184 might return incorrect data.
186 The workaround is to write the contextidr_el1 register on exception
187 return to a 32-bit task.
188 Please note that this does not necessarily enable the workaround,
189 as it depends on the alternative framework, which will only patch
190 the kernel if an affected CPU is detected.
197 config ARM64_64K_PAGES
198 bool "Enable 64KB pages support"
200 This feature enables 64KB pages support (4KB by default)
201 allowing only two levels of page tables and faster TLB
202 look-up. AArch32 emulation is not available when this feature
205 config CPU_BIG_ENDIAN
206 bool "Build big-endian kernel"
208 Say Y if you plan on running a kernel in big-endian mode.
211 bool "Symmetric Multi-Processing"
212 select USE_GENERIC_SMP_HELPERS
214 This enables support for systems with more than one CPU. If
215 you say N here, the kernel will run on single and
216 multiprocessor machines, but will use only one CPU of a
217 multiprocessor machine. If you say Y here, the kernel will run
218 on many, but not all, single processor machines. On a single
219 processor machine, the kernel will run faster if you say N
222 If you don't know what to do here, say N.
225 bool "Multi-core scheduler support"
228 Multi-core scheduler support improves the CPU scheduler's decision
229 making when dealing with multi-core CPU chips at a cost of slightly
230 increased overhead in some places. If unsure say N here.
233 bool "SMT scheduler support"
236 Improves the CPU scheduler's decision making when dealing with
237 MultiThreading at a cost of slightly increased overhead in some
238 places. If unsure say N here.
240 config DISABLE_CPU_SCHED_DOMAIN_BALANCE
241 bool "(EXPERIMENTAL) Disable CPU level scheduler load-balancing"
243 Disables scheduler load-balancing at CPU sched domain level.
246 bool "(EXPERIMENTAL) Heterogenous multiprocessor scheduling"
247 depends on DISABLE_CPU_SCHED_DOMAIN_BALANCE && SCHED_MC && FAIR_GROUP_SCHED && !SCHED_AUTOGROUP
249 Experimental scheduler optimizations for heterogeneous platforms.
250 Attempts to introspectively select task affinity to optimize power
251 and performance. Basic support for multiple (>2) cpu types is in place,
252 but it has only been tested with two types of cpus.
253 There is currently no support for migration of task groups, hence
254 !SCHED_AUTOGROUP. Furthermore, normal load-balancing must be disabled
255 between cpus of different type (DISABLE_CPU_SCHED_DOMAIN_BALANCE).
257 config SCHED_HMP_PRIO_FILTER
258 bool "(EXPERIMENTAL) Filter HMP migrations by task priority"
261 Enables task priority based HMP migration filter. Any task with
262 a NICE value above the threshold will always be on low-power cpus
263 with less compute capacity.
265 config SCHED_HMP_PRIO_FILTER_VAL
266 int "NICE priority threshold"
268 depends on SCHED_HMP_PRIO_FILTER
270 config HMP_FAST_CPU_MASK
271 string "HMP scheduler fast CPU mask"
274 Leave empty to use device tree information.
275 Specify the cpuids of the fast CPUs in the system as a list string,
276 e.g. cpuid 0+1 should be specified as 0-1.
278 config HMP_SLOW_CPU_MASK
279 string "HMP scheduler slow CPU mask"
282 Leave empty to use device tree information.
283 Specify the cpuids of the slow CPUs in the system as a list string,
284 e.g. cpuid 0+1 should be specified as 0-1.
286 config HMP_VARIABLE_SCALE
287 bool "Allows changing the load tracking scale through sysfs"
290 When turned on, this option exports the thresholds and load average
291 period value for the load tracking patches through sysfs.
292 The values can be modified to change the rate of load accumulation
293 and the thresholds used for HMP migration.
294 The load_avg_period_ms is the time in ms to reach a load average of
295 0.5 for an idle task of 0 load average ratio that start a busy loop.
296 The up_threshold and down_threshold is the value to go to a faster
297 CPU or to go back to a slower cpu.
298 The {up,down}_threshold are devided by 1024 before being compared
300 For examples, with load_avg_period_ms = 128 and up_threshold = 512,
301 a running task with a load of 0 will be migrated to a bigger CPU after
302 128ms, because after 128ms its load_avg_ratio is 0.5 and the real
304 This patch has the same behavior as changing the Y of the load
305 average computation to
306 (1002/1024)^(LOAD_AVG_PERIOD/load_avg_period_ms)
307 but it remove intermadiate overflows in computation.
309 config HMP_FREQUENCY_INVARIANT_SCALE
310 bool "(EXPERIMENTAL) Frequency-Invariant Tracked Load for HMP"
311 depends on HMP_VARIABLE_SCALE && CPU_FREQ
313 Scales the current load contribution in line with the frequency
314 of the CPU that the task was executed on.
315 In this version, we use a simple linear scale derived from the
316 maximum frequency reported by CPUFreq.
317 Restricting tracked load to be scaled by the CPU's frequency
318 represents the consumption of possible compute capacity
319 (rather than consumption of actual instantaneous capacity as
320 normal) and allows the HMP migration's simple threshold
321 migration strategy to interact more predictably with CPUFreq's
322 asynchronous compute capacity changes.
324 config SCHED_HMP_LITTLE_PACKING
325 bool "Small task packing for HMP"
329 Allows the HMP Scheduler to pack small tasks into CPUs in the
331 Controlled by two sysfs files in sys/kernel/hmp.
332 packing_enable: 1 to enable, 0 to disable packing. Default 1.
333 packing_limit: runqueue load ratio where a RQ is considered
334 to be full. Default is NICE_0_LOAD * 9/8.
337 int "Maximum number of CPUs (2-32)"
340 # These have to remain sorted largest to smallest
344 bool "Support for hot-pluggable CPUs"
347 Say Y here to experiment with turning CPUs off and on. CPUs
348 can be controlled through /sys/devices/system/cpu.
351 bool "Emulate SWP/SWPB instructions"
353 ARMv6 architecture deprecates use of the SWP/SWPB instructions. ARMv8
354 oblosetes the use of SWP/SWPB instructions. ARMv7 multiprocessing
355 extensions introduce the ability to disable these instructions,
356 triggering an undefined instruction exception when executed. Say Y
357 here to enable software emulation of these instructions for userspace
358 (not kernel) using LDREX/STREX. Also creates /proc/cpu/swp_emulation
361 In some older versions of glibc [<=2.8] SWP is used during futex
362 trylock() operations with the assumption that the code will not
363 be preempted. This invalid assumption may be more likely to fail
364 with SWP emulation enabled, leading to deadlock of the user
367 NOTE: when accessing uncached shared regions, LDREX/STREX rely
368 on an external transaction monitoring block called a global
369 monitor to maintain update atomicity. If your system does not
370 implement a global monitor, this option can cause programs that
371 perform SWP operations to uncached memory to deadlock.
375 source kernel/Kconfig.preempt
381 config ARCH_HAS_HOLES_MEMORYMODEL
382 def_bool y if SPARSEMEM
384 config ARCH_SPARSEMEM_ENABLE
386 select SPARSEMEM_VMEMMAP_ENABLE
388 config ARCH_SPARSEMEM_DEFAULT
389 def_bool ARCH_SPARSEMEM_ENABLE
391 config ARCH_SELECT_MEMORY_MODEL
392 def_bool ARCH_SPARSEMEM_ENABLE
394 config HAVE_ARCH_PFN_VALID
395 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
397 config HW_PERF_EVENTS
398 bool "Enable hardware performance counter support for perf events"
399 depends on PERF_EVENTS
402 Enable hardware performance counter support for perf events. If
403 disabled, perf events will use software events only.
405 config SYS_SUPPORTS_HUGETLBFS
408 config ARCH_WANT_GENERAL_HUGETLB
411 config ARCH_WANT_HUGE_PMD_SHARE
412 def_bool y if !ARM64_64K_PAGES
414 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
418 bool "Kernel support for ARMv7 applications"
422 This option enables features that allow that ran on an ARMv7 or older
423 processor to continue functioning.
425 If you want to execute ARMv7 applications, say Y
427 config ARMV7_COMPAT_CPUINFO
428 bool "Report backwards compatible cpu features in /proc/cpuinfo"
429 depends on ARMV7_COMPAT
432 This option makes /proc/cpuinfo list CPU features that an ARMv7 or
433 earlier kernel would report, but are not optional on an ARMv8 or later
436 If you want to execute ARMv7 applications, say Y
440 config FORCE_MAX_ZONEORDER
442 default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
446 bool "Enable seccomp to safely compute untrusted bytecode"
448 This kernel feature is useful for number crunching applications
449 that may need to compute untrusted bytecode during their
450 execution. By using pipes or other transports made available to
451 the process as file descriptors supporting the read/write
452 syscalls, it's possible to isolate those applications in
453 their own address space using seccomp. Once seccomp is
454 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
455 and the task is only allowed to execute a few safe syscalls
456 defined by each seccomp mode.
463 string "Default kernel command string"
466 Provide a set of default command-line options at build time by
467 entering them here. As a minimum, you should specify the the
468 root device (e.g. root=/dev/nfs).
471 prompt "Kernel command line type" if CMDLINE != ""
472 default CMDLINE_FROM_BOOTLOADER
474 config CMDLINE_FROM_BOOTLOADER
475 bool "Use bootloader kernel arguments if available"
477 Uses the command-line options passed by the boot loader. If
478 the boot loader doesn't provide any, the default kernel command
479 string provided in CMDLINE will be used.
481 config CMDLINE_EXTEND
482 bool "Extend bootloader kernel arguments"
484 The command-line arguments provided by the boot loader will be
485 appended to the default kernel command string.
488 bool "Always use the default kernel command string"
490 Always use the default kernel command string, even if the boot
491 loader passes other arguments to the kernel.
492 This is useful if you cannot or don't want to change the
493 command-line options your boot loader passes to the kernel.
496 config BUILD_ARM64_APPENDED_DTB_IMAGE
497 bool "Build a concatenated Image.gz/dtb by default"
500 Enabling this option will cause a concatenated Image.gz and list of
501 DTBs to be built by default (instead of a standalone Image.gz.)
502 The image will built in arch/arm64/boot/Image.gz-dtb
504 config BUILD_ARM64_APPENDED_DTB_IMAGE_NAMES
505 string "Default dtb names"
506 depends on BUILD_ARM64_APPENDED_DTB_IMAGE
508 Space separated list of names of dtbs to append when
509 building a concatenated Image.gz-dtb.
512 bool "UEFI runtime support"
513 depends on OF && !CPU_BIG_ENDIAN
516 select EFI_PARAMS_FROM_FDT
519 This option provides support for runtime services provided
520 by UEFI firmware (such as non-volatile variables, realtime
521 clock, and platform reset). A UEFI stub is also provided to
522 allow the kernel to be booted as an EFI application. This
523 is only useful on systems that have UEFI firmware.
527 menu "Userspace binary formats"
529 source "fs/Kconfig.binfmt"
532 bool "Kernel support for 32-bit EL0"
533 depends on !ARM64_64K_PAGES
534 select COMPAT_BINFMT_ELF
536 select OLD_SIGSUSPEND3
537 select COMPAT_OLD_SIGACTION
539 This option enables support for a 32-bit EL0 running under a 64-bit
540 kernel at EL1. AArch32-specific components such as system calls,
541 the user helper functions, VFP support and the ptrace interface are
542 handled appropriately by the kernel.
544 If you want to execute 32-bit userspace applications, say Y.
546 config SYSVIPC_COMPAT
548 depends on COMPAT && SYSVIPC
552 menu "Power management options"
554 source "kernel/power/Kconfig"
556 source "drivers/cpufreq/Kconfig"
557 config ARCH_SUSPEND_POSSIBLE
560 config ARM64_CPU_SUSPEND
565 menu "CPU Power Management"
567 source "drivers/cpuidle/Kconfig"
569 source "drivers/cpuquiet/Kconfig"
575 source "drivers/Kconfig"
577 source "drivers/firmware/Kconfig"
581 source "arch/arm64/kvm/Kconfig"
583 source "arch/arm64/Kconfig.debug"
585 source "security/Kconfig"
587 source "crypto/Kconfig"
589 source "arch/arm64/crypto/Kconfig"