# SPDX-License-Identifier: GPL-2.0 config LOONGARCH bool default y select ACPI select ACPI_GENERIC_GSI if ACPI select ACPI_MCFG if ACPI select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI select ARCH_BINFMT_ELF_STATE select ARCH_ENABLE_MEMORY_HOTPLUG select ARCH_ENABLE_MEMORY_HOTREMOVE select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI select ARCH_HAS_CPU_FINALIZE_INIT select ARCH_HAS_FORTIFY_SOURCE select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS select ARCH_HAS_PTE_SPECIAL select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST select ARCH_INLINE_READ_LOCK if !PREEMPTION select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION select ARCH_INLINE_READ_UNLOCK if !PREEMPTION select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION select ARCH_INLINE_WRITE_LOCK if !PREEMPTION select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION select ARCH_INLINE_SPIN_LOCK if !PREEMPTION select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION select ARCH_KEEP_MEMBLOCK select ARCH_MIGHT_HAVE_PC_PARPORT select ARCH_MIGHT_HAVE_PC_SERIO select ARCH_SPARSEMEM_ENABLE select ARCH_STACKWALK select ARCH_SUPPORTS_ACPI select ARCH_SUPPORTS_ATOMIC_RMW select ARCH_SUPPORTS_HUGETLBFS select ARCH_SUPPORTS_NUMA_BALANCING select ARCH_USE_BUILTIN_BSWAP select ARCH_USE_CMPXCHG_LOCKREF select ARCH_USE_QUEUED_RWLOCKS select ARCH_USE_QUEUED_SPINLOCKS select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT select ARCH_WANT_LD_ORPHAN_WARN select ARCH_WANT_OPTIMIZE_VMEMMAP select ARCH_WANTS_NO_INSTR select BUILDTIME_TABLE_SORT select COMMON_CLK select CPU_PM select EFI select GENERIC_CLOCKEVENTS select GENERIC_CMOS_UPDATE select GENERIC_CPU_AUTOPROBE select GENERIC_ENTRY select GENERIC_GETTIMEOFDAY select GENERIC_IOREMAP if !ARCH_IOREMAP select GENERIC_IRQ_MULTI_HANDLER select GENERIC_IRQ_PROBE select GENERIC_IRQ_SHOW select GENERIC_LIB_ASHLDI3 select GENERIC_LIB_ASHRDI3 select GENERIC_LIB_CMPDI2 select GENERIC_LIB_LSHRDI3 select GENERIC_LIB_UCMPDI2 select GENERIC_LIB_DEVMEM_IS_ALLOWED select GENERIC_PCI_IOMAP select GENERIC_SCHED_CLOCK select GENERIC_SMP_IDLE_THREAD select GENERIC_TIME_VSYSCALL select GPIOLIB select HAS_IOPORT select HAVE_ARCH_AUDITSYSCALL select HAVE_ARCH_MMAP_RND_BITS if MMU select HAVE_ARCH_SECCOMP_FILTER select HAVE_ARCH_TRACEHOOK select HAVE_ARCH_TRANSPARENT_HUGEPAGE select HAVE_ASM_MODVERSIONS select HAVE_CONTEXT_TRACKING_USER select HAVE_C_RECORDMCOUNT select HAVE_DEBUG_STACKOVERFLOW select HAVE_DMA_CONTIGUOUS select HAVE_DYNAMIC_FTRACE select HAVE_DYNAMIC_FTRACE_WITH_ARGS select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS select HAVE_DYNAMIC_FTRACE_WITH_REGS select HAVE_EBPF_JIT select HAVE_EFFICIENT_UNALIGNED_ACCESS if !ARCH_STRICT_ALIGN select HAVE_EXIT_THREAD select HAVE_FAST_GUP select HAVE_FTRACE_MCOUNT_RECORD select HAVE_FUNCTION_ARG_ACCESS_API select HAVE_FUNCTION_ERROR_INJECTION select HAVE_FUNCTION_GRAPH_TRACER select HAVE_FUNCTION_TRACER select HAVE_GENERIC_VDSO select HAVE_HW_BREAKPOINT if PERF_EVENTS select HAVE_IOREMAP_PROT select HAVE_IRQ_EXIT_ON_IRQ_STACK select HAVE_IRQ_TIME_ACCOUNTING select HAVE_KPROBES select HAVE_KPROBES_ON_FTRACE select HAVE_KRETPROBES select HAVE_MOD_ARCH_SPECIFIC select HAVE_NMI select HAVE_PCI select HAVE_PERF_EVENTS select HAVE_PERF_REGS select HAVE_PERF_USER_STACK_DUMP select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_RSEQ select HAVE_SAMPLE_FTRACE_DIRECT select HAVE_SAMPLE_FTRACE_DIRECT_MULTI select HAVE_SETUP_PER_CPU_AREA if NUMA select HAVE_STACKPROTECTOR select HAVE_SYSCALL_TRACEPOINTS select HAVE_TIF_NOHZ select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP select IRQ_FORCED_THREADING select IRQ_LOONGARCH_CPU select LOCK_MM_AND_FIND_VMA select MMU_GATHER_MERGE_VMAS if MMU select MODULES_USE_ELF_RELA if MODULES select NEED_PER_CPU_EMBED_FIRST_CHUNK select NEED_PER_CPU_PAGE_FIRST_CHUNK select OF select OF_EARLY_FLATTREE select PCI select PCI_DOMAINS_GENERIC select PCI_ECAM if ACPI select PCI_LOONGSON select PCI_MSI_ARCH_FALLBACKS select PCI_QUIRKS select PERF_USE_VMALLOC select RTC_LIB select SMP select SPARSE_IRQ select SYSCTL_ARCH_UNALIGN_ALLOW select SYSCTL_ARCH_UNALIGN_NO_WARN select SYSCTL_EXCEPTION_TRACE select SWIOTLB select TRACE_IRQFLAGS_SUPPORT select USE_PERCPU_NUMA_NODE_ID select USER_STACKTRACE_SUPPORT select ZONE_DMA32 config 32BIT bool config 64BIT def_bool y config CPU_HAS_FPU bool default y config CPU_HAS_PREFETCH bool default y config GENERIC_BUG def_bool y depends on BUG config GENERIC_BUG_RELATIVE_POINTERS def_bool y depends on GENERIC_BUG config GENERIC_CALIBRATE_DELAY def_bool y config GENERIC_CSUM def_bool y config GENERIC_HWEIGHT def_bool y config L1_CACHE_SHIFT int default "6" config LOCKDEP_SUPPORT bool default y config STACKTRACE_SUPPORT bool default y # MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the # MIPS Loongson code, to preserve Loongson-specific code paths in drivers that # are shared between architectures, and specifically expecting the symbols. config MACH_LOONGSON32 def_bool 32BIT config MACH_LOONGSON64 def_bool 64BIT config FIX_EARLYCON_MEM def_bool y config PAGE_SIZE_4KB bool config PAGE_SIZE_16KB bool config PAGE_SIZE_64KB bool config PGTABLE_2LEVEL bool config PGTABLE_3LEVEL bool config PGTABLE_4LEVEL bool config PGTABLE_LEVELS int default 2 if PGTABLE_2LEVEL default 3 if PGTABLE_3LEVEL default 4 if PGTABLE_4LEVEL config SCHED_OMIT_FRAME_POINTER bool default y config AS_HAS_EXPLICIT_RELOCS def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x)) menu "Kernel type and options" source "kernel/Kconfig.hz" choice prompt "Page Table Layout" default 16KB_2LEVEL if 32BIT default 16KB_3LEVEL if 64BIT help Allows choosing the page table layout, which is a combination of page size and page table levels. The size of virtual memory address space are determined by the page table layout. config 4KB_3LEVEL bool "4KB with 3 levels" select PAGE_SIZE_4KB select PGTABLE_3LEVEL help This option selects 4KB page size with 3 level page tables, which support a maximum of 39 bits of application virtual memory. config 4KB_4LEVEL bool "4KB with 4 levels" select PAGE_SIZE_4KB select PGTABLE_4LEVEL help This option selects 4KB page size with 4 level page tables, which support a maximum of 48 bits of application virtual memory. config 16KB_2LEVEL bool "16KB with 2 levels" select PAGE_SIZE_16KB select PGTABLE_2LEVEL help This option selects 16KB page size with 2 level page tables, which support a maximum of 36 bits of application virtual memory. config 16KB_3LEVEL bool "16KB with 3 levels" select PAGE_SIZE_16KB select PGTABLE_3LEVEL help This option selects 16KB page size with 3 level page tables, which support a maximum of 47 bits of application virtual memory. config 64KB_2LEVEL bool "64KB with 2 levels" select PAGE_SIZE_64KB select PGTABLE_2LEVEL help This option selects 64KB page size with 2 level page tables, which support a maximum of 42 bits of application virtual memory. config 64KB_3LEVEL bool "64KB with 3 levels" select PAGE_SIZE_64KB select PGTABLE_3LEVEL help This option selects 64KB page size with 3 level page tables, which support a maximum of 55 bits of application virtual memory. endchoice config CMDLINE string "Built-in kernel command line" help For most platforms, the arguments for the kernel's command line are provided at run-time, during boot. However, there are cases where either no arguments are being provided or the provided arguments are insufficient or even invalid. When that occurs, it is possible to define a built-in command line here and choose how the kernel should use it later on. choice prompt "Kernel command line type" default CMDLINE_BOOTLOADER help Choose how the kernel will handle the provided built-in command line. config CMDLINE_BOOTLOADER bool "Use bootloader kernel arguments if available" help Prefer the command-line passed by the boot loader if available. Use the built-in command line as fallback in case we get nothing during boot. This is the default behaviour. config CMDLINE_EXTEND bool "Use built-in to extend bootloader kernel arguments" help The command-line arguments provided during boot will be appended to the built-in command line. This is useful in cases where the provided arguments are insufficient and you don't want to or cannot modify them. config CMDLINE_FORCE bool "Always use the built-in kernel command string" help Always use the built-in command line, even if we get one during boot. This is useful in case you need to override the provided command line on systems where you don't have or want control over it. endchoice config DMI bool "Enable DMI scanning" select DMI_SCAN_MACHINE_NON_EFI_FALLBACK default y help This enables SMBIOS/DMI feature for systems, and scanning of DMI to identify machine quirks. config EFI bool "EFI runtime service support" select UCS2_STRING select EFI_RUNTIME_WRAPPERS help This enables the kernel to use EFI runtime services that are available (such as the EFI variable services). config EFI_STUB bool "EFI boot stub support" default y depends on EFI select EFI_GENERIC_STUB help This kernel feature allows the kernel to be loaded directly by EFI firmware without the use of a bootloader. config SMP bool "Multi-Processing support" help This enables support for systems with more than one CPU. If you have a system with only one CPU, say N. If you have a system with more than one CPU, say Y. If you say N here, the kernel will run on uni- 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, uniprocessor machines. On a uniprocessor machine, the kernel will run faster if you say N here. See also the SMP-HOWTO available at . If you don't know what to do here, say N. config HOTPLUG_CPU bool "Support for hot-pluggable CPUs" depends on SMP select GENERIC_IRQ_MIGRATION help Say Y here to allow turning CPUs off and on. CPUs can be controlled through /sys/devices/system/cpu. (Note: power management support will enable this option automatically on SMP systems. ) Say N if you want to disable CPU hotplug. config NR_CPUS int "Maximum number of CPUs (2-256)" range 2 256 depends on SMP default "64" help This allows you to specify the maximum number of CPUs which this kernel will support. config NUMA bool "NUMA Support" select SMP select ACPI_NUMA if ACPI help Say Y to compile the kernel with NUMA (Non-Uniform Memory Access) support. This option improves performance on systems with more than one NUMA node; on single node systems it is generally better to leave it disabled. config NODES_SHIFT int default "6" depends on NUMA config ARCH_FORCE_MAX_ORDER int "Maximum zone order" default "13" if PAGE_SIZE_64KB default "11" if PAGE_SIZE_16KB default "10" help The kernel memory allocator divides physically contiguous memory blocks into "zones", where each zone is a power of two number of pages. This option selects the largest power of two that the kernel keeps in the memory allocator. If you need to allocate very large blocks of physically contiguous memory, then you may need to increase this value. The page size is not necessarily 4KB. Keep this in mind when choosing a value for this option. config ARCH_IOREMAP bool "Enable LoongArch DMW-based ioremap()" help We use generic TLB-based ioremap() by default since it has page protection support. However, you can enable LoongArch DMW-based ioremap() for better performance. config ARCH_WRITECOMBINE bool "Enable WriteCombine (WUC) for ioremap()" help LoongArch maintains cache coherency in hardware, but when paired with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which is similar to WriteCombine) is out of the scope of cache coherency machanism for PCIe devices (this is a PCIe protocol violation, which may be fixed in newer chipsets). This means WUC can only used for write-only memory regions now, so this option is disabled by default, making WUC silently fallback to SUC for ioremap(). You can enable this option if the kernel is ensured to run on hardware without this bug. You can override this setting via writecombine=on/off boot parameter. config ARCH_STRICT_ALIGN bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT default y help Not all LoongArch cores support h/w unaligned access, we can use -mstrict-align build parameter to prevent unaligned accesses. CPUs with h/w unaligned access support: Loongson-2K2000/2K3000/3A5000/3C5000/3D5000. CPUs without h/w unaligned access support: Loongson-2K500/2K1000. This option is enabled by default to make the kernel be able to run on all LoongArch systems. But you can disable it manually if you want to run kernel only on systems with h/w unaligned access support in order to optimise for performance. config KEXEC bool "Kexec system call" select KEXEC_CORE help kexec is a system call that implements the ability to shutdown your current kernel, and to start another kernel. It is like a reboot but it is independent of the system firmware. And like a reboot you can start any kernel with it, not just Linux. The name comes from the similarity to the exec system call. config CRASH_DUMP bool "Build kdump crash kernel" select RELOCATABLE help Generate crash dump after being started by kexec. This should be normally only set in special crash dump kernels which are loaded in the main kernel with kexec-tools into a specially reserved region and then later executed after a crash by kdump/kexec. For more details see Documentation/admin-guide/kdump/kdump.rst config RELOCATABLE bool "Relocatable kernel" help This builds the kernel as a Position Independent Executable (PIE), which retains all relocation metadata required, so as to relocate the kernel binary at runtime to a different virtual address from its link address. config RANDOMIZE_BASE bool "Randomize the address of the kernel (KASLR)" depends on RELOCATABLE help Randomizes the physical and virtual address at which the kernel image is loaded, as a security feature that deters exploit attempts relying on knowledge of the location of kernel internals. The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET. If unsure, say N. config RANDOMIZE_BASE_MAX_OFFSET hex "Maximum KASLR offset" if EXPERT depends on RANDOMIZE_BASE range 0x0 0x10000000 default "0x01000000" help When KASLR is active, this provides the maximum offset that will be applied to the kernel image. It should be set according to the amount of physical RAM available in the target system. This is limited by the size of the lower address memory, 256MB. config SECCOMP bool "Enable seccomp to safely compute untrusted bytecode" depends on PROC_FS default y 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 /proc//seccomp, it cannot be disabled and the task is only allowed to execute a few safe syscalls defined by each seccomp mode. If unsure, say Y. Only embedded should say N here. endmenu config ARCH_SELECT_MEMORY_MODEL def_bool y config ARCH_FLATMEM_ENABLE def_bool y depends on !NUMA config ARCH_SPARSEMEM_ENABLE def_bool y select SPARSEMEM_VMEMMAP_ENABLE help Say Y to support efficient handling of sparse physical memory, for architectures which are either NUMA (Non-Uniform Memory Access) or have huge holes in the physical address space for other reasons. See for more. config ARCH_ENABLE_THP_MIGRATION def_bool y depends on TRANSPARENT_HUGEPAGE config ARCH_MEMORY_PROBE def_bool y depends on MEMORY_HOTPLUG config MMU bool default y config ARCH_MMAP_RND_BITS_MIN default 12 config ARCH_MMAP_RND_BITS_MAX default 18 menu "Power management options" config ARCH_SUSPEND_POSSIBLE def_bool y config ARCH_HIBERNATION_POSSIBLE def_bool y source "kernel/power/Kconfig" source "drivers/acpi/Kconfig" endmenu source "drivers/firmware/Kconfig"