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"
136 select PINCTRL_RK3368
137 select ARCH_REQUIRE_GPIOLIB
139 source "arch/arm64/mach-rockchip/Kconfig"
142 bool "ARMv8 software model (Versatile Express)"
143 select ARCH_REQUIRE_GPIOLIB
144 select COMMON_CLK_VERSATILE
145 select POWER_RESET_VEXPRESS
146 select VEXPRESS_CONFIG
148 This enables support for the ARMv8 software model (Versatile
152 bool "AppliedMicro X-Gene SOC Family"
154 This enables support for AppliedMicro X-Gene SOC Family
165 menu "Kernel Features"
167 config ARM64_64K_PAGES
168 bool "Enable 64KB pages support"
170 This feature enables 64KB pages support (4KB by default)
171 allowing only two levels of page tables and faster TLB
172 look-up. AArch32 emulation is not available when this feature
175 config CPU_BIG_ENDIAN
176 bool "Build big-endian kernel"
178 Say Y if you plan on running a kernel in big-endian mode.
181 bool "Symmetric Multi-Processing"
182 select USE_GENERIC_SMP_HELPERS
184 This enables support for systems with more than one CPU. If
185 you say N here, the kernel will run on single and
186 multiprocessor machines, but will use only one CPU of a
187 multiprocessor machine. If you say Y here, the kernel will run
188 on many, but not all, single processor machines. On a single
189 processor machine, the kernel will run faster if you say N
192 If you don't know what to do here, say N.
195 bool "Multi-core scheduler support"
198 Multi-core scheduler support improves the CPU scheduler's decision
199 making when dealing with multi-core CPU chips at a cost of slightly
200 increased overhead in some places. If unsure say N here.
203 bool "SMT scheduler support"
206 Improves the CPU scheduler's decision making when dealing with
207 MultiThreading at a cost of slightly increased overhead in some
208 places. If unsure say N here.
210 config DISABLE_CPU_SCHED_DOMAIN_BALANCE
211 bool "(EXPERIMENTAL) Disable CPU level scheduler load-balancing"
213 Disables scheduler load-balancing at CPU sched domain level.
216 bool "(EXPERIMENTAL) Heterogenous multiprocessor scheduling"
217 depends on DISABLE_CPU_SCHED_DOMAIN_BALANCE && SCHED_MC && FAIR_GROUP_SCHED && !SCHED_AUTOGROUP
219 Experimental scheduler optimizations for heterogeneous platforms.
220 Attempts to introspectively select task affinity to optimize power
221 and performance. Basic support for multiple (>2) cpu types is in place,
222 but it has only been tested with two types of cpus.
223 There is currently no support for migration of task groups, hence
224 !SCHED_AUTOGROUP. Furthermore, normal load-balancing must be disabled
225 between cpus of different type (DISABLE_CPU_SCHED_DOMAIN_BALANCE).
227 config SCHED_HMP_PRIO_FILTER
228 bool "(EXPERIMENTAL) Filter HMP migrations by task priority"
231 Enables task priority based HMP migration filter. Any task with
232 a NICE value above the threshold will always be on low-power cpus
233 with less compute capacity.
235 config SCHED_HMP_PRIO_FILTER_VAL
236 int "NICE priority threshold"
238 depends on SCHED_HMP_PRIO_FILTER
240 config HMP_FAST_CPU_MASK
241 string "HMP scheduler fast CPU mask"
244 Leave empty to use device tree information.
245 Specify the cpuids of the fast CPUs in the system as a list string,
246 e.g. cpuid 0+1 should be specified as 0-1.
248 config HMP_SLOW_CPU_MASK
249 string "HMP scheduler slow CPU mask"
252 Leave empty to use device tree information.
253 Specify the cpuids of the slow CPUs in the system as a list string,
254 e.g. cpuid 0+1 should be specified as 0-1.
256 config HMP_VARIABLE_SCALE
257 bool "Allows changing the load tracking scale through sysfs"
260 When turned on, this option exports the thresholds and load average
261 period value for the load tracking patches through sysfs.
262 The values can be modified to change the rate of load accumulation
263 and the thresholds used for HMP migration.
264 The load_avg_period_ms is the time in ms to reach a load average of
265 0.5 for an idle task of 0 load average ratio that start a busy loop.
266 The up_threshold and down_threshold is the value to go to a faster
267 CPU or to go back to a slower cpu.
268 The {up,down}_threshold are devided by 1024 before being compared
270 For examples, with load_avg_period_ms = 128 and up_threshold = 512,
271 a running task with a load of 0 will be migrated to a bigger CPU after
272 128ms, because after 128ms its load_avg_ratio is 0.5 and the real
274 This patch has the same behavior as changing the Y of the load
275 average computation to
276 (1002/1024)^(LOAD_AVG_PERIOD/load_avg_period_ms)
277 but it remove intermadiate overflows in computation.
279 config HMP_FREQUENCY_INVARIANT_SCALE
280 bool "(EXPERIMENTAL) Frequency-Invariant Tracked Load for HMP"
281 depends on HMP_VARIABLE_SCALE && CPU_FREQ
283 Scales the current load contribution in line with the frequency
284 of the CPU that the task was executed on.
285 In this version, we use a simple linear scale derived from the
286 maximum frequency reported by CPUFreq.
287 Restricting tracked load to be scaled by the CPU's frequency
288 represents the consumption of possible compute capacity
289 (rather than consumption of actual instantaneous capacity as
290 normal) and allows the HMP migration's simple threshold
291 migration strategy to interact more predictably with CPUFreq's
292 asynchronous compute capacity changes.
294 config SCHED_HMP_LITTLE_PACKING
295 bool "Small task packing for HMP"
299 Allows the HMP Scheduler to pack small tasks into CPUs in the
301 Controlled by two sysfs files in sys/kernel/hmp.
302 packing_enable: 1 to enable, 0 to disable packing. Default 1.
303 packing_limit: runqueue load ratio where a RQ is considered
304 to be full. Default is NICE_0_LOAD * 9/8.
307 int "Maximum number of CPUs (2-32)"
310 # These have to remain sorted largest to smallest
314 bool "Support for hot-pluggable CPUs"
317 Say Y here to experiment with turning CPUs off and on. CPUs
318 can be controlled through /sys/devices/system/cpu.
321 bool "Emulate SWP/SWPB instructions"
323 ARMv6 architecture deprecates use of the SWP/SWPB instructions. ARMv8
324 oblosetes the use of SWP/SWPB instructions. ARMv7 multiprocessing
325 extensions introduce the ability to disable these instructions,
326 triggering an undefined instruction exception when executed. Say Y
327 here to enable software emulation of these instructions for userspace
328 (not kernel) using LDREX/STREX. Also creates /proc/cpu/swp_emulation
331 In some older versions of glibc [<=2.8] SWP is used during futex
332 trylock() operations with the assumption that the code will not
333 be preempted. This invalid assumption may be more likely to fail
334 with SWP emulation enabled, leading to deadlock of the user
337 NOTE: when accessing uncached shared regions, LDREX/STREX rely
338 on an external transaction monitoring block called a global
339 monitor to maintain update atomicity. If your system does not
340 implement a global monitor, this option can cause programs that
341 perform SWP operations to uncached memory to deadlock.
345 source kernel/Kconfig.preempt
351 config ARCH_HAS_HOLES_MEMORYMODEL
352 def_bool y if SPARSEMEM
354 config ARCH_SPARSEMEM_ENABLE
356 select SPARSEMEM_VMEMMAP_ENABLE
358 config ARCH_SPARSEMEM_DEFAULT
359 def_bool ARCH_SPARSEMEM_ENABLE
361 config ARCH_SELECT_MEMORY_MODEL
362 def_bool ARCH_SPARSEMEM_ENABLE
364 config HAVE_ARCH_PFN_VALID
365 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
367 config HW_PERF_EVENTS
368 bool "Enable hardware performance counter support for perf events"
369 depends on PERF_EVENTS
372 Enable hardware performance counter support for perf events. If
373 disabled, perf events will use software events only.
375 config SYS_SUPPORTS_HUGETLBFS
378 config ARCH_WANT_GENERAL_HUGETLB
381 config ARCH_WANT_HUGE_PMD_SHARE
382 def_bool y if !ARM64_64K_PAGES
384 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
388 bool "Kernel support for ARMv7 applications"
392 This option enables features that allow that ran on an ARMv7 or older
393 processor to continue functioning.
395 If you want to execute ARMv7 applications, say Y
397 config ARMV7_COMPAT_CPUINFO
398 bool "Report backwards compatible cpu features in /proc/cpuinfo"
399 depends on ARMV7_COMPAT
402 This option makes /proc/cpuinfo list CPU features that an ARMv7 or
403 earlier kernel would report, but are not optional on an ARMv8 or later
406 If you want to execute ARMv7 applications, say Y
410 config FORCE_MAX_ZONEORDER
412 default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
416 bool "Enable seccomp to safely compute untrusted bytecode"
418 This kernel feature is useful for number crunching applications
419 that may need to compute untrusted bytecode during their
420 execution. By using pipes or other transports made available to
421 the process as file descriptors supporting the read/write
422 syscalls, it's possible to isolate those applications in
423 their own address space using seccomp. Once seccomp is
424 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
425 and the task is only allowed to execute a few safe syscalls
426 defined by each seccomp mode.
433 string "Default kernel command string"
436 Provide a set of default command-line options at build time by
437 entering them here. As a minimum, you should specify the the
438 root device (e.g. root=/dev/nfs).
441 prompt "Kernel command line type" if CMDLINE != ""
442 default CMDLINE_FROM_BOOTLOADER
444 config CMDLINE_FROM_BOOTLOADER
445 bool "Use bootloader kernel arguments if available"
447 Uses the command-line options passed by the boot loader. If
448 the boot loader doesn't provide any, the default kernel command
449 string provided in CMDLINE will be used.
451 config CMDLINE_EXTEND
452 bool "Extend bootloader kernel arguments"
454 The command-line arguments provided by the boot loader will be
455 appended to the default kernel command string.
458 bool "Always use the default kernel command string"
460 Always use the default kernel command string, even if the boot
461 loader passes other arguments to the kernel.
462 This is useful if you cannot or don't want to change the
463 command-line options your boot loader passes to the kernel.
466 config BUILD_ARM64_APPENDED_DTB_IMAGE
467 bool "Build a concatenated Image.gz/dtb by default"
470 Enabling this option will cause a concatenated Image.gz and list of
471 DTBs to be built by default (instead of a standalone Image.gz.)
472 The image will built in arch/arm64/boot/Image.gz-dtb
474 config BUILD_ARM64_APPENDED_DTB_IMAGE_NAMES
475 string "Default dtb names"
476 depends on BUILD_ARM64_APPENDED_DTB_IMAGE
478 Space separated list of names of dtbs to append when
479 building a concatenated Image.gz-dtb.
482 bool "UEFI runtime support"
483 depends on OF && !CPU_BIG_ENDIAN
486 select EFI_PARAMS_FROM_FDT
489 This option provides support for runtime services provided
490 by UEFI firmware (such as non-volatile variables, realtime
491 clock, and platform reset). A UEFI stub is also provided to
492 allow the kernel to be booted as an EFI application. This
493 is only useful on systems that have UEFI firmware.
497 menu "Userspace binary formats"
499 source "fs/Kconfig.binfmt"
502 bool "Kernel support for 32-bit EL0"
503 depends on !ARM64_64K_PAGES
504 select COMPAT_BINFMT_ELF
506 select OLD_SIGSUSPEND3
507 select COMPAT_OLD_SIGACTION
509 This option enables support for a 32-bit EL0 running under a 64-bit
510 kernel at EL1. AArch32-specific components such as system calls,
511 the user helper functions, VFP support and the ptrace interface are
512 handled appropriately by the kernel.
514 If you want to execute 32-bit userspace applications, say Y.
516 config SYSVIPC_COMPAT
518 depends on COMPAT && SYSVIPC
522 menu "Power management options"
524 source "kernel/power/Kconfig"
526 source "drivers/cpufreq/Kconfig"
527 config ARCH_SUSPEND_POSSIBLE
530 config ARM64_CPU_SUSPEND
535 menu "CPU Power Management"
537 source "drivers/cpuidle/Kconfig"
543 source "drivers/Kconfig"
545 source "drivers/firmware/Kconfig"
549 source "arch/arm64/kvm/Kconfig"
551 source "arch/arm64/Kconfig.debug"
553 source "security/Kconfig"
555 source "crypto/Kconfig"
557 source "arch/arm64/crypto/Kconfig"