|  | config ARM64 | 
|  | def_bool y | 
|  | select ACPI_GENERIC_GSI if ACPI | 
|  | select ACPI_REDUCED_HARDWARE_ONLY if ACPI | 
|  | select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE | 
|  | select ARCH_HAS_ELF_RANDOMIZE | 
|  | 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_IRQ_SHOW_LEVEL | 
|  | 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 ILLEGAL_POINTER_VALUE | 
|  | hex | 
|  | default 0xdead000000000000 | 
|  |  | 
|  | 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 | 
|  |  | 
|  | config 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 | 
|  |  | 
|  | source "init/Kconfig" | 
|  |  | 
|  | source "kernel/Kconfig.freezer" | 
|  |  | 
|  | menu "Platform selection" | 
|  |  | 
|  | config ARCH_EXYNOS | 
|  | bool | 
|  | help | 
|  | This enables support for Samsung Exynos SoC family | 
|  |  | 
|  | config ARCH_EXYNOS7 | 
|  | bool "ARMv8 based Samsung Exynos7" | 
|  | select ARCH_EXYNOS | 
|  | select COMMON_CLK_SAMSUNG | 
|  | select HAVE_S3C2410_WATCHDOG if WATCHDOG | 
|  | select HAVE_S3C_RTC if RTC_CLASS | 
|  | select PINCTRL | 
|  | select PINCTRL_EXYNOS | 
|  |  | 
|  | help | 
|  | This enables support for Samsung Exynos7 SoC family | 
|  |  | 
|  | config ARCH_FSL_LS2085A | 
|  | bool "Freescale LS2085A SOC" | 
|  | help | 
|  | This enables support for Freescale LS2085A SOC. | 
|  |  | 
|  | config ARCH_MEDIATEK | 
|  | bool "Mediatek MT65xx & MT81xx ARMv8 SoC" | 
|  | select ARM_GIC | 
|  | select PINCTRL | 
|  | help | 
|  | Support for Mediatek MT65xx & MT81xx ARMv8 SoCs | 
|  |  | 
|  | config ARCH_QCOM | 
|  | bool "Qualcomm Platforms" | 
|  | select PINCTRL | 
|  | help | 
|  | This enables support for the ARMv8 based Qualcomm chipsets. | 
|  |  | 
|  | config ARCH_SEATTLE | 
|  | bool "AMD Seattle SoC Family" | 
|  | help | 
|  | This enables support for AMD Seattle SOC Family | 
|  |  | 
|  | config ARCH_TEGRA | 
|  | bool "NVIDIA Tegra SoC Family" | 
|  | select ARCH_HAS_RESET_CONTROLLER | 
|  | select ARCH_REQUIRE_GPIOLIB | 
|  | select CLKDEV_LOOKUP | 
|  | select CLKSRC_MMIO | 
|  | select CLKSRC_OF | 
|  | select GENERIC_CLOCKEVENTS | 
|  | select HAVE_CLK | 
|  | select PINCTRL | 
|  | select RESET_CONTROLLER | 
|  | help | 
|  | This enables support for the NVIDIA Tegra SoC family. | 
|  |  | 
|  | config ARCH_TEGRA_132_SOC | 
|  | bool "NVIDIA Tegra132 SoC" | 
|  | depends on ARCH_TEGRA | 
|  | select PINCTRL_TEGRA124 | 
|  | select USB_ULPI if USB_PHY | 
|  | select USB_ULPI_VIEWPORT if USB_PHY | 
|  | help | 
|  | Enable support for NVIDIA Tegra132 SoC, based on the Denver | 
|  | ARMv8 CPU.  The Tegra132 SoC is similar to the Tegra124 SoC, | 
|  | but contains an NVIDIA Denver CPU complex in place of | 
|  | Tegra124's "4+1" Cortex-A15 CPU complex. | 
|  |  | 
|  | config ARCH_SPRD | 
|  | bool "Spreadtrum SoC platform" | 
|  | help | 
|  | Support for Spreadtrum ARM based SoCs | 
|  |  | 
|  | 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 | 
|  |  | 
|  | config ARCH_ZYNQMP | 
|  | bool "Xilinx ZynqMP Family" | 
|  | help | 
|  | This enables support for Xilinx ZynqMP 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. | 
|  |  | 
|  | config ARM64_ERRATUM_845719 | 
|  | bool "Cortex-A53: 845719: a load might read incorrect data" | 
|  | depends on COMPAT | 
|  | default y | 
|  | help | 
|  | This option adds an alternative code sequence to work around ARM | 
|  | erratum 845719 on Cortex-A53 parts up to r0p4. | 
|  |  | 
|  | When running a compat (AArch32) userspace on an affected Cortex-A53 | 
|  | part, a load at EL0 from a virtual address that matches the bottom 32 | 
|  | bits of the virtual address used by a recent load at (AArch64) EL1 | 
|  | might return incorrect data. | 
|  |  | 
|  | The workaround is to write the contextidr_el1 register on exception | 
|  | return to a 32-bit task. | 
|  | 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_843419 | 
|  | bool "Cortex-A53: 843419: A load or store might access an incorrect address" | 
|  | depends on MODULES | 
|  | default y | 
|  | help | 
|  | This option builds kernel modules using the large memory model in | 
|  | order to avoid the use of the ADRP instruction, which can cause | 
|  | a subsequent memory access to use an incorrect address on Cortex-A53 | 
|  | parts up to r0p4. | 
|  |  | 
|  | Note that the kernel itself must be linked with a version of ld | 
|  | which fixes potentially affected ADRP instructions through the | 
|  | use of veneers. | 
|  |  | 
|  | 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 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 (2-4096)" | 
|  | range 2 4096 | 
|  | 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 UP_LATE_INIT | 
|  | def_bool y | 
|  | depends on !SMP | 
|  |  | 
|  | 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 || EXPERT | 
|  | 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 also enabled CONFIG_ARM64_64K_PAGES, please be aware that you | 
|  | will only be able to execute AArch32 binaries that were compiled with | 
|  | 64k aligned segments. | 
|  |  | 
|  | 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 "drivers/acpi/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" |