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 config ARM64_64K_PAGES
172 bool "Enable 64KB pages support"
174 This feature enables 64KB pages support (4KB by default)
175 allowing only two levels of page tables and faster TLB
176 look-up. AArch32 emulation is not available when this feature
179 config CPU_BIG_ENDIAN
180 bool "Build big-endian kernel"
182 Say Y if you plan on running a kernel in big-endian mode.
185 bool "Symmetric Multi-Processing"
186 select USE_GENERIC_SMP_HELPERS
188 This enables support for systems with more than one CPU. If
189 you say N here, the kernel will run on single and
190 multiprocessor machines, but will use only one CPU of a
191 multiprocessor machine. If you say Y here, the kernel will run
192 on many, but not all, single processor machines. On a single
193 processor machine, the kernel will run faster if you say N
196 If you don't know what to do here, say N.
199 bool "Multi-core scheduler support"
202 Multi-core scheduler support improves the CPU scheduler's decision
203 making when dealing with multi-core CPU chips at a cost of slightly
204 increased overhead in some places. If unsure say N here.
207 bool "SMT scheduler support"
210 Improves the CPU scheduler's decision making when dealing with
211 MultiThreading at a cost of slightly increased overhead in some
212 places. If unsure say N here.
214 config DISABLE_CPU_SCHED_DOMAIN_BALANCE
215 bool "(EXPERIMENTAL) Disable CPU level scheduler load-balancing"
217 Disables scheduler load-balancing at CPU sched domain level.
220 bool "(EXPERIMENTAL) Heterogenous multiprocessor scheduling"
221 depends on DISABLE_CPU_SCHED_DOMAIN_BALANCE && SCHED_MC && FAIR_GROUP_SCHED && !SCHED_AUTOGROUP
223 Experimental scheduler optimizations for heterogeneous platforms.
224 Attempts to introspectively select task affinity to optimize power
225 and performance. Basic support for multiple (>2) cpu types is in place,
226 but it has only been tested with two types of cpus.
227 There is currently no support for migration of task groups, hence
228 !SCHED_AUTOGROUP. Furthermore, normal load-balancing must be disabled
229 between cpus of different type (DISABLE_CPU_SCHED_DOMAIN_BALANCE).
231 config SCHED_HMP_PRIO_FILTER
232 bool "(EXPERIMENTAL) Filter HMP migrations by task priority"
235 Enables task priority based HMP migration filter. Any task with
236 a NICE value above the threshold will always be on low-power cpus
237 with less compute capacity.
239 config SCHED_HMP_PRIO_FILTER_VAL
240 int "NICE priority threshold"
242 depends on SCHED_HMP_PRIO_FILTER
244 config HMP_FAST_CPU_MASK
245 string "HMP scheduler fast CPU mask"
248 Leave empty to use device tree information.
249 Specify the cpuids of the fast CPUs in the system as a list string,
250 e.g. cpuid 0+1 should be specified as 0-1.
252 config HMP_SLOW_CPU_MASK
253 string "HMP scheduler slow CPU mask"
256 Leave empty to use device tree information.
257 Specify the cpuids of the slow CPUs in the system as a list string,
258 e.g. cpuid 0+1 should be specified as 0-1.
260 config HMP_VARIABLE_SCALE
261 bool "Allows changing the load tracking scale through sysfs"
264 When turned on, this option exports the thresholds and load average
265 period value for the load tracking patches through sysfs.
266 The values can be modified to change the rate of load accumulation
267 and the thresholds used for HMP migration.
268 The load_avg_period_ms is the time in ms to reach a load average of
269 0.5 for an idle task of 0 load average ratio that start a busy loop.
270 The up_threshold and down_threshold is the value to go to a faster
271 CPU or to go back to a slower cpu.
272 The {up,down}_threshold are devided by 1024 before being compared
274 For examples, with load_avg_period_ms = 128 and up_threshold = 512,
275 a running task with a load of 0 will be migrated to a bigger CPU after
276 128ms, because after 128ms its load_avg_ratio is 0.5 and the real
278 This patch has the same behavior as changing the Y of the load
279 average computation to
280 (1002/1024)^(LOAD_AVG_PERIOD/load_avg_period_ms)
281 but it remove intermadiate overflows in computation.
283 config HMP_FREQUENCY_INVARIANT_SCALE
284 bool "(EXPERIMENTAL) Frequency-Invariant Tracked Load for HMP"
285 depends on HMP_VARIABLE_SCALE && CPU_FREQ
287 Scales the current load contribution in line with the frequency
288 of the CPU that the task was executed on.
289 In this version, we use a simple linear scale derived from the
290 maximum frequency reported by CPUFreq.
291 Restricting tracked load to be scaled by the CPU's frequency
292 represents the consumption of possible compute capacity
293 (rather than consumption of actual instantaneous capacity as
294 normal) and allows the HMP migration's simple threshold
295 migration strategy to interact more predictably with CPUFreq's
296 asynchronous compute capacity changes.
298 config SCHED_HMP_LITTLE_PACKING
299 bool "Small task packing for HMP"
303 Allows the HMP Scheduler to pack small tasks into CPUs in the
305 Controlled by two sysfs files in sys/kernel/hmp.
306 packing_enable: 1 to enable, 0 to disable packing. Default 1.
307 packing_limit: runqueue load ratio where a RQ is considered
308 to be full. Default is NICE_0_LOAD * 9/8.
311 int "Maximum number of CPUs (2-32)"
314 # These have to remain sorted largest to smallest
318 bool "Support for hot-pluggable CPUs"
321 Say Y here to experiment with turning CPUs off and on. CPUs
322 can be controlled through /sys/devices/system/cpu.
325 bool "Emulate SWP/SWPB instructions"
327 ARMv6 architecture deprecates use of the SWP/SWPB instructions. ARMv8
328 oblosetes the use of SWP/SWPB instructions. ARMv7 multiprocessing
329 extensions introduce the ability to disable these instructions,
330 triggering an undefined instruction exception when executed. Say Y
331 here to enable software emulation of these instructions for userspace
332 (not kernel) using LDREX/STREX. Also creates /proc/cpu/swp_emulation
335 In some older versions of glibc [<=2.8] SWP is used during futex
336 trylock() operations with the assumption that the code will not
337 be preempted. This invalid assumption may be more likely to fail
338 with SWP emulation enabled, leading to deadlock of the user
341 NOTE: when accessing uncached shared regions, LDREX/STREX rely
342 on an external transaction monitoring block called a global
343 monitor to maintain update atomicity. If your system does not
344 implement a global monitor, this option can cause programs that
345 perform SWP operations to uncached memory to deadlock.
349 source kernel/Kconfig.preempt
355 config ARCH_HAS_HOLES_MEMORYMODEL
356 def_bool y if SPARSEMEM
358 config ARCH_SPARSEMEM_ENABLE
360 select SPARSEMEM_VMEMMAP_ENABLE
362 config ARCH_SPARSEMEM_DEFAULT
363 def_bool ARCH_SPARSEMEM_ENABLE
365 config ARCH_SELECT_MEMORY_MODEL
366 def_bool ARCH_SPARSEMEM_ENABLE
368 config HAVE_ARCH_PFN_VALID
369 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
371 config HW_PERF_EVENTS
372 bool "Enable hardware performance counter support for perf events"
373 depends on PERF_EVENTS
376 Enable hardware performance counter support for perf events. If
377 disabled, perf events will use software events only.
379 config SYS_SUPPORTS_HUGETLBFS
382 config ARCH_WANT_GENERAL_HUGETLB
385 config ARCH_WANT_HUGE_PMD_SHARE
386 def_bool y if !ARM64_64K_PAGES
388 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
392 bool "Kernel support for ARMv7 applications"
396 This option enables features that allow that ran on an ARMv7 or older
397 processor to continue functioning.
399 If you want to execute ARMv7 applications, say Y
401 config ARMV7_COMPAT_CPUINFO
402 bool "Report backwards compatible cpu features in /proc/cpuinfo"
403 depends on ARMV7_COMPAT
406 This option makes /proc/cpuinfo list CPU features that an ARMv7 or
407 earlier kernel would report, but are not optional on an ARMv8 or later
410 If you want to execute ARMv7 applications, say Y
414 config FORCE_MAX_ZONEORDER
416 default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
420 bool "Enable seccomp to safely compute untrusted bytecode"
422 This kernel feature is useful for number crunching applications
423 that may need to compute untrusted bytecode during their
424 execution. By using pipes or other transports made available to
425 the process as file descriptors supporting the read/write
426 syscalls, it's possible to isolate those applications in
427 their own address space using seccomp. Once seccomp is
428 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
429 and the task is only allowed to execute a few safe syscalls
430 defined by each seccomp mode.
437 string "Default kernel command string"
440 Provide a set of default command-line options at build time by
441 entering them here. As a minimum, you should specify the the
442 root device (e.g. root=/dev/nfs).
445 prompt "Kernel command line type" if CMDLINE != ""
446 default CMDLINE_FROM_BOOTLOADER
448 config CMDLINE_FROM_BOOTLOADER
449 bool "Use bootloader kernel arguments if available"
451 Uses the command-line options passed by the boot loader. If
452 the boot loader doesn't provide any, the default kernel command
453 string provided in CMDLINE will be used.
455 config CMDLINE_EXTEND
456 bool "Extend bootloader kernel arguments"
458 The command-line arguments provided by the boot loader will be
459 appended to the default kernel command string.
462 bool "Always use the default kernel command string"
464 Always use the default kernel command string, even if the boot
465 loader passes other arguments to the kernel.
466 This is useful if you cannot or don't want to change the
467 command-line options your boot loader passes to the kernel.
470 config BUILD_ARM64_APPENDED_DTB_IMAGE
471 bool "Build a concatenated Image.gz/dtb by default"
474 Enabling this option will cause a concatenated Image.gz and list of
475 DTBs to be built by default (instead of a standalone Image.gz.)
476 The image will built in arch/arm64/boot/Image.gz-dtb
478 config BUILD_ARM64_APPENDED_DTB_IMAGE_NAMES
479 string "Default dtb names"
480 depends on BUILD_ARM64_APPENDED_DTB_IMAGE
482 Space separated list of names of dtbs to append when
483 building a concatenated Image.gz-dtb.
486 bool "UEFI runtime support"
487 depends on OF && !CPU_BIG_ENDIAN
490 select EFI_PARAMS_FROM_FDT
493 This option provides support for runtime services provided
494 by UEFI firmware (such as non-volatile variables, realtime
495 clock, and platform reset). A UEFI stub is also provided to
496 allow the kernel to be booted as an EFI application. This
497 is only useful on systems that have UEFI firmware.
501 menu "Userspace binary formats"
503 source "fs/Kconfig.binfmt"
506 bool "Kernel support for 32-bit EL0"
507 depends on !ARM64_64K_PAGES
508 select COMPAT_BINFMT_ELF
510 select OLD_SIGSUSPEND3
511 select COMPAT_OLD_SIGACTION
513 This option enables support for a 32-bit EL0 running under a 64-bit
514 kernel at EL1. AArch32-specific components such as system calls,
515 the user helper functions, VFP support and the ptrace interface are
516 handled appropriately by the kernel.
518 If you want to execute 32-bit userspace applications, say Y.
520 config SYSVIPC_COMPAT
522 depends on COMPAT && SYSVIPC
526 menu "Power management options"
528 source "kernel/power/Kconfig"
530 source "drivers/cpufreq/Kconfig"
531 config ARCH_SUSPEND_POSSIBLE
534 config ARM64_CPU_SUSPEND
539 menu "CPU Power Management"
541 source "drivers/cpuidle/Kconfig"
543 source "drivers/cpuquiet/Kconfig"
549 source "drivers/Kconfig"
551 source "drivers/firmware/Kconfig"
555 source "arch/arm64/kvm/Kconfig"
557 source "arch/arm64/Kconfig.debug"
559 source "security/Kconfig"
561 source "crypto/Kconfig"
563 source "arch/arm64/crypto/Kconfig"