config ARM64 def_bool y select ARCH_BINFMT_ELF_RANDOMIZE_PIE select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE select ARCH_HAS_GCOV_PROFILE_ALL select ARCH_HAS_SG_CHAIN select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST select ARCH_USE_CMPXCHG_LOCKREF select ARCH_SUPPORTS_ATOMIC_RMW select ARCH_WANT_OPTIONAL_GPIOLIB select ARCH_WANT_COMPAT_IPC_PARSE_VERSION select ARCH_WANT_FRAME_POINTERS select ARM_AMBA select ARM_ARCH_TIMER select ARM_GIC select AUDIT_ARCH_COMPAT_GENERIC select ARM_GIC_V2M if PCI_MSI select ARM_GIC_V3 select ARM_GIC_V3_ITS if PCI_MSI select BUILDTIME_EXTABLE_SORT select CLONE_BACKWARDS select COMMON_CLK select CPU_PM if (SUSPEND || CPU_IDLE) select DCACHE_WORD_ACCESS select GENERIC_ALLOCATOR select GENERIC_CLOCKEVENTS select GENERIC_CLOCKEVENTS_BROADCAST if SMP select GENERIC_CPU_AUTOPROBE select GENERIC_EARLY_IOREMAP select GENERIC_IRQ_PROBE select GENERIC_IRQ_SHOW select GENERIC_PCI_IOMAP select GENERIC_SCHED_CLOCK select GENERIC_SMP_IDLE_THREAD select GENERIC_STRNCPY_FROM_USER select GENERIC_STRNLEN_USER select GENERIC_TIME_VSYSCALL select HANDLE_DOMAIN_IRQ select HARDIRQS_SW_RESEND select HAVE_ALIGNED_STRUCT_PAGE if SLUB select HAVE_ARCH_AUDITSYSCALL select HAVE_ARCH_BITREVERSE select HAVE_ARCH_JUMP_LABEL select HAVE_ARCH_KGDB select HAVE_ARCH_SECCOMP_FILTER select HAVE_ARCH_TRACEHOOK select HAVE_BPF_JIT select HAVE_C_RECORDMCOUNT select HAVE_CC_STACKPROTECTOR select HAVE_CMPXCHG_DOUBLE select HAVE_DEBUG_BUGVERBOSE select HAVE_DEBUG_KMEMLEAK select HAVE_DMA_API_DEBUG select HAVE_DMA_ATTRS select HAVE_DMA_CONTIGUOUS select HAVE_DYNAMIC_FTRACE select HAVE_EFFICIENT_UNALIGNED_ACCESS select HAVE_FTRACE_MCOUNT_RECORD select HAVE_FUNCTION_TRACER select HAVE_FUNCTION_GRAPH_TRACER select HAVE_GENERIC_DMA_COHERENT select HAVE_HW_BREAKPOINT if PERF_EVENTS select HAVE_MEMBLOCK select HAVE_PATA_PLATFORM select HAVE_PERF_EVENTS select HAVE_PERF_REGS select HAVE_PERF_USER_STACK_DUMP select HAVE_RCU_TABLE_FREE select HAVE_SYSCALL_TRACEPOINTS select IRQ_DOMAIN select MODULES_USE_ELF_RELA select NO_BOOTMEM select OF select OF_EARLY_FLATTREE select OF_RESERVED_MEM select PERF_USE_VMALLOC select POWER_RESET select POWER_SUPPLY select RTC_LIB select SPARSE_IRQ select SYSCTL_EXCEPTION_TRACE select HAVE_CONTEXT_TRACKING help ARM 64-bit (AArch64) Linux support. config 64BIT def_bool y config ARCH_PHYS_ADDR_T_64BIT def_bool y config MMU def_bool y config NO_IOPORT_MAP def_bool y if !PCI config STACKTRACE_SUPPORT def_bool y config LOCKDEP_SUPPORT def_bool y config TRACE_IRQFLAGS_SUPPORT def_bool y config RWSEM_XCHGADD_ALGORITHM def_bool y config GENERIC_HWEIGHT def_bool y config GENERIC_CSUM def_bool y config GENERIC_CALIBRATE_DELAY def_bool y config ZONE_DMA def_bool y config HAVE_GENERIC_RCU_GUP def_bool y config ARCH_DMA_ADDR_T_64BIT def_bool y config NEED_DMA_MAP_STATE def_bool y config NEED_SG_DMA_LENGTH def_bool y config SWIOTLB def_bool y config IOMMU_HELPER def_bool SWIOTLB config KERNEL_MODE_NEON def_bool y config FIX_EARLYCON_MEM def_bool y source "init/Kconfig" source "kernel/Kconfig.freezer" menu "Platform selection" config ARCH_SEATTLE bool "AMD Seattle SoC Family" help This enables support for AMD Seattle SOC Family config ARCH_THUNDER bool "Cavium Inc. Thunder SoC Family" help This enables support for Cavium's Thunder Family of SoCs. config ARCH_VEXPRESS bool "ARMv8 software model (Versatile Express)" select ARCH_REQUIRE_GPIOLIB select COMMON_CLK_VERSATILE select POWER_RESET_VEXPRESS select VEXPRESS_CONFIG help This enables support for the ARMv8 software model (Versatile Express). config ARCH_XGENE bool "AppliedMicro X-Gene SOC Family" help This enables support for AppliedMicro X-Gene SOC Family endmenu menu "Bus support" config PCI bool "PCI support" help This feature enables support for PCI bus system. If you say Y here, the kernel will include drivers and infrastructure code to support PCI bus devices. config PCI_DOMAINS def_bool PCI config PCI_DOMAINS_GENERIC def_bool PCI config PCI_SYSCALL def_bool PCI source "drivers/pci/Kconfig" source "drivers/pci/pcie/Kconfig" source "drivers/pci/hotplug/Kconfig" endmenu menu "Kernel Features" menu "ARM errata workarounds via the alternatives framework" config ARM64_ERRATUM_826319 bool "Cortex-A53: 826319: System might deadlock if a write cannot complete until read data is accepted" default y help This option adds an alternative code sequence to work around ARM erratum 826319 on Cortex-A53 parts up to r0p2 with an AMBA 4 ACE or AXI master interface and an L2 cache. If a Cortex-A53 uses an AMBA AXI4 ACE interface to other processors and is unable to accept a certain write via this interface, it will not progress on read data presented on the read data channel and the system can deadlock. The workaround promotes data cache clean instructions to data cache clean-and-invalidate. Please note that this does not necessarily enable the workaround, as it depends on the alternative framework, which will only patch the kernel if an affected CPU is detected. If unsure, say Y. config ARM64_ERRATUM_827319 bool "Cortex-A53: 827319: Data cache clean instructions might cause overlapping transactions to the interconnect" default y help This option adds an alternative code sequence to work around ARM erratum 827319 on Cortex-A53 parts up to r0p2 with an AMBA 5 CHI master interface and an L2 cache. Under certain conditions this erratum can cause a clean line eviction to occur at the same time as another transaction to the same address on the AMBA 5 CHI interface, which can cause data corruption if the interconnect reorders the two transactions. The workaround promotes data cache clean instructions to data cache clean-and-invalidate. Please note that this does not necessarily enable the workaround, as it depends on the alternative framework, which will only patch the kernel if an affected CPU is detected. If unsure, say Y. config ARM64_ERRATUM_824069 bool "Cortex-A53: 824069: Cache line might not be marked as clean after a CleanShared snoop" default y help This option adds an alternative code sequence to work around ARM erratum 824069 on Cortex-A53 parts up to r0p2 when it is connected to a coherent interconnect. If a Cortex-A53 processor is executing a store or prefetch for write instruction at the same time as a processor in another cluster is executing a cache maintenance operation to the same address, then this erratum might cause a clean cache line to be incorrectly marked as dirty. The workaround promotes data cache clean instructions to data cache clean-and-invalidate. Please note that this option does not necessarily enable the workaround, as it depends on the alternative framework, which will only patch the kernel if an affected CPU is detected. If unsure, say Y. config ARM64_ERRATUM_819472 bool "Cortex-A53: 819472: Store exclusive instructions might cause data corruption" default y help This option adds an alternative code sequence to work around ARM erratum 819472 on Cortex-A53 parts up to r0p1 with an L2 cache present when it is connected to a coherent interconnect. If the processor is executing a load and store exclusive sequence at the same time as a processor in another cluster is executing a cache maintenance operation to the same address, then this erratum might cause data corruption. The workaround promotes data cache clean instructions to data cache clean-and-invalidate. Please note that this does not necessarily enable the workaround, as it depends on the alternative framework, which will only patch the kernel if an affected CPU is detected. If unsure, say Y. config ARM64_ERRATUM_832075 bool "Cortex-A57: 832075: possible deadlock on mixing exclusive memory accesses with device loads" default y help This option adds an alternative code sequence to work around ARM erratum 832075 on Cortex-A57 parts up to r1p2. Affected Cortex-A57 parts might deadlock when exclusive load/store instructions to Write-Back memory are mixed with Device loads. The workaround is to promote device loads to use Load-Acquire semantics. Please note that this does not necessarily enable the workaround, as it depends on the alternative framework, which will only patch the kernel if an affected CPU is detected. If unsure, say Y. endmenu choice prompt "Page size" default ARM64_4K_PAGES help Page size (translation granule) configuration. config ARM64_4K_PAGES bool "4KB" help This feature enables 4KB pages support. config ARM64_64K_PAGES bool "64KB" help This feature enables 64KB pages support (4KB by default) allowing only two levels of page tables and faster TLB look-up. AArch32 emulation is not available when this feature is enabled. endchoice choice prompt "Virtual address space size" default ARM64_VA_BITS_39 if ARM64_4K_PAGES default ARM64_VA_BITS_42 if ARM64_64K_PAGES help Allows choosing one of multiple possible virtual address space sizes. The level of translation table is determined by a combination of page size and virtual address space size. config ARM64_VA_BITS_39 bool "39-bit" depends on ARM64_4K_PAGES config ARM64_VA_BITS_42 bool "42-bit" depends on ARM64_64K_PAGES config ARM64_VA_BITS_48 bool "48-bit" endchoice config ARM64_VA_BITS int default 39 if ARM64_VA_BITS_39 default 42 if ARM64_VA_BITS_42 default 48 if ARM64_VA_BITS_48 config ARM64_PGTABLE_LEVELS int default 2 if ARM64_64K_PAGES && ARM64_VA_BITS_42 default 3 if ARM64_64K_PAGES && ARM64_VA_BITS_48 default 3 if ARM64_4K_PAGES && ARM64_VA_BITS_39 default 4 if ARM64_4K_PAGES && ARM64_VA_BITS_48 config CPU_BIG_ENDIAN bool "Build big-endian kernel" help Say Y if you plan on running a kernel in big-endian mode. config SMP bool "Symmetric Multi-Processing" help This enables support for systems with more than one CPU. If you say N here, the kernel will run on single and multiprocessor machines, but will use only one CPU of a multiprocessor machine. If you say Y here, the kernel will run on many, but not all, single processor machines. On a single processor machine, the kernel will run faster if you say N here. If you don't know what to do here, say N. config SCHED_MC bool "Multi-core scheduler support" depends on SMP help Multi-core scheduler support improves the CPU scheduler's decision making when dealing with multi-core CPU chips at a cost of slightly increased overhead in some places. If unsure say N here. config SCHED_SMT bool "SMT scheduler support" depends on SMP help Improves the CPU scheduler's decision making when dealing with MultiThreading at a cost of slightly increased overhead in some places. If unsure say N here. config NR_CPUS int "Maximum number of CPUs (2-64)" range 2 64 depends on SMP # These have to remain sorted largest to smallest default "64" config HOTPLUG_CPU bool "Support for hot-pluggable CPUs" depends on SMP help Say Y here to experiment with turning CPUs off and on. CPUs can be controlled through /sys/devices/system/cpu. source kernel/Kconfig.preempt config HZ int default 100 config ARCH_HAS_HOLES_MEMORYMODEL def_bool y if SPARSEMEM config ARCH_SPARSEMEM_ENABLE def_bool y select SPARSEMEM_VMEMMAP_ENABLE config ARCH_SPARSEMEM_DEFAULT def_bool ARCH_SPARSEMEM_ENABLE config ARCH_SELECT_MEMORY_MODEL def_bool ARCH_SPARSEMEM_ENABLE config HAVE_ARCH_PFN_VALID def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM config HW_PERF_EVENTS bool "Enable hardware performance counter support for perf events" depends on PERF_EVENTS default y help Enable hardware performance counter support for perf events. If disabled, perf events will use software events only. config SYS_SUPPORTS_HUGETLBFS def_bool y config ARCH_WANT_GENERAL_HUGETLB def_bool y config ARCH_WANT_HUGE_PMD_SHARE def_bool y if !ARM64_64K_PAGES config HAVE_ARCH_TRANSPARENT_HUGEPAGE def_bool y config ARCH_HAS_CACHE_LINE_SIZE def_bool y source "mm/Kconfig" config SECCOMP bool "Enable seccomp to safely compute untrusted bytecode" ---help--- This kernel feature is useful for number crunching applications that may need to compute untrusted bytecode during their execution. By using pipes or other transports made available to the process as file descriptors supporting the read/write syscalls, it's possible to isolate those applications in their own address space using seccomp. Once seccomp is enabled via prctl(PR_SET_SECCOMP), it cannot be disabled and the task is only allowed to execute a few safe syscalls defined by each seccomp mode. config XEN_DOM0 def_bool y depends on XEN config XEN bool "Xen guest support on ARM64" depends on ARM64 && OF select SWIOTLB_XEN help Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64. config FORCE_MAX_ZONEORDER int default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE) default "11" menuconfig ARMV8_DEPRECATED bool "Emulate deprecated/obsolete ARMv8 instructions" depends on COMPAT help Legacy software support may require certain instructions that have been deprecated or obsoleted in the architecture. Enable this config to enable selective emulation of these features. If unsure, say Y if ARMV8_DEPRECATED config SWP_EMULATION bool "Emulate SWP/SWPB instructions" help ARMv8 obsoletes the use of A32 SWP/SWPB instructions such that they are always undefined. Say Y here to enable software emulation of these instructions for userspace using LDXR/STXR. In some older versions of glibc [<=2.8] SWP is used during futex trylock() operations with the assumption that the code will not be preempted. This invalid assumption may be more likely to fail with SWP emulation enabled, leading to deadlock of the user application. NOTE: when accessing uncached shared regions, LDXR/STXR rely on an external transaction monitoring block called a global monitor to maintain update atomicity. If your system does not implement a global monitor, this option can cause programs that perform SWP operations to uncached memory to deadlock. If unsure, say Y config CP15_BARRIER_EMULATION bool "Emulate CP15 Barrier instructions" help The CP15 barrier instructions - CP15ISB, CP15DSB, and CP15DMB - are deprecated in ARMv8 (and ARMv7). It is strongly recommended to use the ISB, DSB, and DMB instructions instead. Say Y here to enable software emulation of these instructions for AArch32 userspace code. When this option is enabled, CP15 barrier usage is traced which can help identify software that needs updating. If unsure, say Y config SETEND_EMULATION bool "Emulate SETEND instruction" help The SETEND instruction alters the data-endianness of the AArch32 EL0, and is deprecated in ARMv8. Say Y here to enable software emulation of the instruction for AArch32 userspace code. Note: All the cpus on the system must have mixed endian support at EL0 for this feature to be enabled. If a new CPU - which doesn't support mixed endian - is hotplugged in after this feature has been enabled, there could be unexpected results in the applications. If unsure, say Y endif endmenu menu "Boot options" config CMDLINE string "Default kernel command string" default "" help Provide a set of default command-line options at build time by entering them here. As a minimum, you should specify the the root device (e.g. root=/dev/nfs). config CMDLINE_FORCE bool "Always use the default kernel command string" help Always use the default kernel command string, even if the boot loader passes other arguments to the kernel. This is useful if you cannot or don't want to change the command-line options your boot loader passes to the kernel. config EFI_STUB bool config EFI bool "UEFI runtime support" depends on OF && !CPU_BIG_ENDIAN select LIBFDT select UCS2_STRING select EFI_PARAMS_FROM_FDT select EFI_RUNTIME_WRAPPERS select EFI_STUB select EFI_ARMSTUB default y help This option provides support for runtime services provided by UEFI firmware (such as non-volatile variables, realtime clock, and platform reset). A UEFI stub is also provided to allow the kernel to be booted as an EFI application. This is only useful on systems that have UEFI firmware. config DMI bool "Enable support for SMBIOS (DMI) tables" depends on EFI default y help This enables SMBIOS/DMI feature for systems. This option is only useful on systems that have UEFI firmware. However, even with this option, the resultant kernel should continue to boot on existing non-UEFI platforms. endmenu menu "Userspace binary formats" source "fs/Kconfig.binfmt" config COMPAT bool "Kernel support for 32-bit EL0" depends on !ARM64_64K_PAGES select COMPAT_BINFMT_ELF select HAVE_UID16 select OLD_SIGSUSPEND3 select COMPAT_OLD_SIGACTION help This option enables support for a 32-bit EL0 running under a 64-bit kernel at EL1. AArch32-specific components such as system calls, the user helper functions, VFP support and the ptrace interface are handled appropriately by the kernel. If you want to execute 32-bit userspace applications, say Y. config SYSVIPC_COMPAT def_bool y depends on COMPAT && SYSVIPC endmenu menu "Power management options" source "kernel/power/Kconfig" config ARCH_SUSPEND_POSSIBLE def_bool y endmenu menu "CPU Power Management" source "drivers/cpuidle/Kconfig" source "drivers/cpufreq/Kconfig" endmenu source "net/Kconfig" source "drivers/Kconfig" source "drivers/firmware/Kconfig" source "fs/Kconfig" source "arch/arm64/kvm/Kconfig" source "arch/arm64/Kconfig.debug" source "security/Kconfig" source "crypto/Kconfig" if CRYPTO source "arch/arm64/crypto/Kconfig" endif source "lib/Kconfig"