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 ILLEGAL_POINTER_VALUE
94 default 0xdead000000000000
96 config LOCKDEP_SUPPORT
99 config TRACE_IRQFLAGS_SUPPORT
102 config RWSEM_XCHGADD_ALGORITHM
105 config GENERIC_HWEIGHT
111 config GENERIC_CALIBRATE_DELAY
117 config ARCH_DMA_ADDR_T_64BIT
120 config NEED_DMA_MAP_STATE
123 config NEED_SG_DMA_LENGTH
132 config KERNEL_MODE_NEON
135 config FIX_EARLYCON_MEM
138 source "init/Kconfig"
140 source "kernel/Kconfig.freezer"
142 menu "Platform selection"
147 select PINCTRL_RK3368
148 select ARCH_REQUIRE_GPIOLIB
150 source "arch/arm64/mach-rockchip/Kconfig"
153 bool "ARMv8 software model (Versatile Express)"
154 select ARCH_REQUIRE_GPIOLIB
155 select COMMON_CLK_VERSATILE
156 select POWER_RESET_VEXPRESS
157 select VEXPRESS_CONFIG
159 This enables support for the ARMv8 software model (Versatile
163 bool "AppliedMicro X-Gene SOC Family"
165 This enables support for AppliedMicro X-Gene SOC Family
176 menu "Kernel Features"
178 menu "ARM errata workarounds"
180 config ARM64_ERRATUM_845719
181 bool "Cortex-A53: 845719: a load might read incorrect data"
185 This option adds an alternative code sequence to work around ARM
186 erratum 845719 on Cortex-A53 parts up to r0p4.
188 When running a compat (AArch32) userspace on an affected Cortex-A53
189 part, a load at EL0 from a virtual address that matches the bottom 32
190 bits of the virtual address used by a recent load at (AArch64) EL1
191 might return incorrect data.
193 The workaround is to write the contextidr_el1 register on exception
194 return to a 32-bit task.
195 Please note that this does not necessarily enable the workaround,
196 as it depends on the alternative framework, which will only patch
197 the kernel if an affected CPU is detected.
204 config ARM64_64K_PAGES
205 bool "Enable 64KB pages support"
207 This feature enables 64KB pages support (4KB by default)
208 allowing only two levels of page tables and faster TLB
209 look-up. AArch32 emulation is not available when this feature
212 config CPU_BIG_ENDIAN
213 bool "Build big-endian kernel"
215 Say Y if you plan on running a kernel in big-endian mode.
218 bool "Symmetric Multi-Processing"
219 select USE_GENERIC_SMP_HELPERS
221 This enables support for systems with more than one CPU. If
222 you say N here, the kernel will run on single and
223 multiprocessor machines, but will use only one CPU of a
224 multiprocessor machine. If you say Y here, the kernel will run
225 on many, but not all, single processor machines. On a single
226 processor machine, the kernel will run faster if you say N
229 If you don't know what to do here, say N.
232 bool "Multi-core scheduler support"
235 Multi-core scheduler support improves the CPU scheduler's decision
236 making when dealing with multi-core CPU chips at a cost of slightly
237 increased overhead in some places. If unsure say N here.
240 bool "SMT scheduler support"
243 Improves the CPU scheduler's decision making when dealing with
244 MultiThreading at a cost of slightly increased overhead in some
245 places. If unsure say N here.
247 config DISABLE_CPU_SCHED_DOMAIN_BALANCE
248 bool "(EXPERIMENTAL) Disable CPU level scheduler load-balancing"
250 Disables scheduler load-balancing at CPU sched domain level.
253 bool "(EXPERIMENTAL) Heterogenous multiprocessor scheduling"
254 depends on DISABLE_CPU_SCHED_DOMAIN_BALANCE && SCHED_MC && FAIR_GROUP_SCHED && !SCHED_AUTOGROUP
256 Experimental scheduler optimizations for heterogeneous platforms.
257 Attempts to introspectively select task affinity to optimize power
258 and performance. Basic support for multiple (>2) cpu types is in place,
259 but it has only been tested with two types of cpus.
260 There is currently no support for migration of task groups, hence
261 !SCHED_AUTOGROUP. Furthermore, normal load-balancing must be disabled
262 between cpus of different type (DISABLE_CPU_SCHED_DOMAIN_BALANCE).
264 config SCHED_HMP_PRIO_FILTER
265 bool "(EXPERIMENTAL) Filter HMP migrations by task priority"
268 Enables task priority based HMP migration filter. Any task with
269 a NICE value above the threshold will always be on low-power cpus
270 with less compute capacity.
272 config SCHED_HMP_PRIO_FILTER_VAL
273 int "NICE priority threshold"
275 depends on SCHED_HMP_PRIO_FILTER
277 config HMP_FAST_CPU_MASK
278 string "HMP scheduler fast CPU mask"
281 Leave empty to use device tree information.
282 Specify the cpuids of the fast CPUs in the system as a list string,
283 e.g. cpuid 0+1 should be specified as 0-1.
285 config HMP_SLOW_CPU_MASK
286 string "HMP scheduler slow CPU mask"
289 Leave empty to use device tree information.
290 Specify the cpuids of the slow CPUs in the system as a list string,
291 e.g. cpuid 0+1 should be specified as 0-1.
293 config HMP_VARIABLE_SCALE
294 bool "Allows changing the load tracking scale through sysfs"
297 When turned on, this option exports the thresholds and load average
298 period value for the load tracking patches through sysfs.
299 The values can be modified to change the rate of load accumulation
300 and the thresholds used for HMP migration.
301 The load_avg_period_ms is the time in ms to reach a load average of
302 0.5 for an idle task of 0 load average ratio that start a busy loop.
303 The up_threshold and down_threshold is the value to go to a faster
304 CPU or to go back to a slower cpu.
305 The {up,down}_threshold are devided by 1024 before being compared
307 For examples, with load_avg_period_ms = 128 and up_threshold = 512,
308 a running task with a load of 0 will be migrated to a bigger CPU after
309 128ms, because after 128ms its load_avg_ratio is 0.5 and the real
311 This patch has the same behavior as changing the Y of the load
312 average computation to
313 (1002/1024)^(LOAD_AVG_PERIOD/load_avg_period_ms)
314 but it remove intermadiate overflows in computation.
316 config HMP_FREQUENCY_INVARIANT_SCALE
317 bool "(EXPERIMENTAL) Frequency-Invariant Tracked Load for HMP"
318 depends on HMP_VARIABLE_SCALE && CPU_FREQ
320 Scales the current load contribution in line with the frequency
321 of the CPU that the task was executed on.
322 In this version, we use a simple linear scale derived from the
323 maximum frequency reported by CPUFreq.
324 Restricting tracked load to be scaled by the CPU's frequency
325 represents the consumption of possible compute capacity
326 (rather than consumption of actual instantaneous capacity as
327 normal) and allows the HMP migration's simple threshold
328 migration strategy to interact more predictably with CPUFreq's
329 asynchronous compute capacity changes.
331 config SCHED_HMP_LITTLE_PACKING
332 bool "Small task packing for HMP"
336 Allows the HMP Scheduler to pack small tasks into CPUs in the
338 Controlled by two sysfs files in sys/kernel/hmp.
339 packing_enable: 1 to enable, 0 to disable packing. Default 1.
340 packing_limit: runqueue load ratio where a RQ is considered
341 to be full. Default is NICE_0_LOAD * 9/8.
344 int "Maximum number of CPUs (2-32)"
347 # These have to remain sorted largest to smallest
351 bool "Support for hot-pluggable CPUs"
354 Say Y here to experiment with turning CPUs off and on. CPUs
355 can be controlled through /sys/devices/system/cpu.
358 bool "Emulate SWP/SWPB instructions"
360 ARMv6 architecture deprecates use of the SWP/SWPB instructions. ARMv8
361 oblosetes the use of SWP/SWPB instructions. ARMv7 multiprocessing
362 extensions introduce the ability to disable these instructions,
363 triggering an undefined instruction exception when executed. Say Y
364 here to enable software emulation of these instructions for userspace
365 (not kernel) using LDREX/STREX. Also creates /proc/cpu/swp_emulation
368 In some older versions of glibc [<=2.8] SWP is used during futex
369 trylock() operations with the assumption that the code will not
370 be preempted. This invalid assumption may be more likely to fail
371 with SWP emulation enabled, leading to deadlock of the user
374 NOTE: when accessing uncached shared regions, LDREX/STREX rely
375 on an external transaction monitoring block called a global
376 monitor to maintain update atomicity. If your system does not
377 implement a global monitor, this option can cause programs that
378 perform SWP operations to uncached memory to deadlock.
382 source kernel/Kconfig.preempt
388 config ARCH_HAS_HOLES_MEMORYMODEL
389 def_bool y if SPARSEMEM
391 config ARCH_SPARSEMEM_ENABLE
393 select SPARSEMEM_VMEMMAP_ENABLE
395 config ARCH_SPARSEMEM_DEFAULT
396 def_bool ARCH_SPARSEMEM_ENABLE
398 config ARCH_SELECT_MEMORY_MODEL
399 def_bool ARCH_SPARSEMEM_ENABLE
401 config HAVE_ARCH_PFN_VALID
402 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
404 config HW_PERF_EVENTS
405 bool "Enable hardware performance counter support for perf events"
406 depends on PERF_EVENTS
409 Enable hardware performance counter support for perf events. If
410 disabled, perf events will use software events only.
412 config SYS_SUPPORTS_HUGETLBFS
415 config ARCH_WANT_GENERAL_HUGETLB
418 config ARCH_WANT_HUGE_PMD_SHARE
419 def_bool y if !ARM64_64K_PAGES
421 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
425 bool "Kernel support for ARMv7 applications"
429 This option enables features that allow that ran on an ARMv7 or older
430 processor to continue functioning.
432 If you want to execute ARMv7 applications, say Y
434 config ARMV7_COMPAT_CPUINFO
435 bool "Report backwards compatible cpu features in /proc/cpuinfo"
436 depends on ARMV7_COMPAT
439 This option makes /proc/cpuinfo list CPU features that an ARMv7 or
440 earlier kernel would report, but are not optional on an ARMv8 or later
443 If you want to execute ARMv7 applications, say Y
447 config FORCE_MAX_ZONEORDER
449 default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
453 bool "Enable seccomp to safely compute untrusted bytecode"
455 This kernel feature is useful for number crunching applications
456 that may need to compute untrusted bytecode during their
457 execution. By using pipes or other transports made available to
458 the process as file descriptors supporting the read/write
459 syscalls, it's possible to isolate those applications in
460 their own address space using seccomp. Once seccomp is
461 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
462 and the task is only allowed to execute a few safe syscalls
463 defined by each seccomp mode.
470 string "Default kernel command string"
473 Provide a set of default command-line options at build time by
474 entering them here. As a minimum, you should specify the the
475 root device (e.g. root=/dev/nfs).
478 prompt "Kernel command line type" if CMDLINE != ""
479 default CMDLINE_FROM_BOOTLOADER
481 config CMDLINE_FROM_BOOTLOADER
482 bool "Use bootloader kernel arguments if available"
484 Uses the command-line options passed by the boot loader. If
485 the boot loader doesn't provide any, the default kernel command
486 string provided in CMDLINE will be used.
488 config CMDLINE_EXTEND
489 bool "Extend bootloader kernel arguments"
491 The command-line arguments provided by the boot loader will be
492 appended to the default kernel command string.
495 bool "Always use the default kernel command string"
497 Always use the default kernel command string, even if the boot
498 loader passes other arguments to the kernel.
499 This is useful if you cannot or don't want to change the
500 command-line options your boot loader passes to the kernel.
503 config BUILD_ARM64_APPENDED_DTB_IMAGE
504 bool "Build a concatenated Image.gz/dtb by default"
507 Enabling this option will cause a concatenated Image.gz and list of
508 DTBs to be built by default (instead of a standalone Image.gz.)
509 The image will built in arch/arm64/boot/Image.gz-dtb
511 config BUILD_ARM64_APPENDED_DTB_IMAGE_NAMES
512 string "Default dtb names"
513 depends on BUILD_ARM64_APPENDED_DTB_IMAGE
515 Space separated list of names of dtbs to append when
516 building a concatenated Image.gz-dtb.
519 bool "UEFI runtime support"
520 depends on OF && !CPU_BIG_ENDIAN
523 select EFI_PARAMS_FROM_FDT
526 This option provides support for runtime services provided
527 by UEFI firmware (such as non-volatile variables, realtime
528 clock, and platform reset). A UEFI stub is also provided to
529 allow the kernel to be booted as an EFI application. This
530 is only useful on systems that have UEFI firmware.
534 menu "Userspace binary formats"
536 source "fs/Kconfig.binfmt"
539 bool "Kernel support for 32-bit EL0"
540 depends on !ARM64_64K_PAGES
541 select COMPAT_BINFMT_ELF
543 select OLD_SIGSUSPEND3
544 select COMPAT_OLD_SIGACTION
546 This option enables support for a 32-bit EL0 running under a 64-bit
547 kernel at EL1. AArch32-specific components such as system calls,
548 the user helper functions, VFP support and the ptrace interface are
549 handled appropriately by the kernel.
551 If you want to execute 32-bit userspace applications, say Y.
553 config SYSVIPC_COMPAT
555 depends on COMPAT && SYSVIPC
559 menu "Power management options"
561 source "kernel/power/Kconfig"
563 source "drivers/cpufreq/Kconfig"
564 config ARCH_SUSPEND_POSSIBLE
567 config ARM64_CPU_SUSPEND
572 menu "CPU Power Management"
574 source "drivers/cpuidle/Kconfig"
576 source "drivers/cpuquiet/Kconfig"
582 source "drivers/Kconfig"
584 source "drivers/firmware/Kconfig"
588 source "arch/arm64/kvm/Kconfig"
590 source "arch/arm64/Kconfig.debug"
592 source "security/Kconfig"
594 source "crypto/Kconfig"
596 source "arch/arm64/crypto/Kconfig"