| # SPDX-License-Identifier: GPL-2.0 |
| source "arch/powerpc/platforms/Kconfig.cputype" |
| |
| config 32BIT |
| bool |
| default y if PPC32 |
| |
| config 64BIT |
| bool |
| default y if PPC64 |
| |
| config MMU |
| bool |
| default y |
| |
| config ARCH_MMAP_RND_BITS_MAX |
| # On Book3S 64, the default virtual address space for 64-bit processes |
| # is 2^47 (128TB). As a maximum, allow randomisation to consume up to |
| # 32T of address space (2^45), which should ensure a reasonable gap |
| # between bottom-up and top-down allocations for applications that |
| # consume "normal" amounts of address space. Book3S 64 only supports 64K |
| # and 4K page sizes. |
| default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K) |
| default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K) |
| # |
| # On all other 64-bit platforms (currently only Book3E), the virtual |
| # address space is 2^46 (64TB). Allow randomisation to consume up to 16T |
| # of address space (2^44). Only 4K page sizes are supported. |
| default 32 if 64BIT # 32 = 44 (16T) - 12 (4K) |
| # |
| # For 32-bit, use the compat values, as they're the same. |
| default ARCH_MMAP_RND_COMPAT_BITS_MAX |
| |
| config ARCH_MMAP_RND_BITS_MIN |
| # Allow randomisation to consume up to 1GB of address space (2^30). |
| default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K) |
| default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K) |
| # |
| # For 32-bit, use the compat values, as they're the same. |
| default ARCH_MMAP_RND_COMPAT_BITS_MIN |
| |
| config ARCH_MMAP_RND_COMPAT_BITS_MAX |
| # Total virtual address space for 32-bit processes is 2^31 (2GB). |
| # Allow randomisation to consume up to 512MB of address space (2^29). |
| default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K) |
| default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K) |
| default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K) |
| default 17 # 17 = 29 (512MB) - 12 (4K) |
| |
| config ARCH_MMAP_RND_COMPAT_BITS_MIN |
| # Total virtual address space for 32-bit processes is 2^31 (2GB). |
| # Allow randomisation to consume up to 8MB of address space (2^23). |
| default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K) |
| default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K) |
| default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K) |
| default 11 # 11 = 23 (8MB) - 12 (4K) |
| |
| config HAVE_SETUP_PER_CPU_AREA |
| def_bool PPC64 |
| |
| config NEED_PER_CPU_EMBED_FIRST_CHUNK |
| def_bool PPC64 |
| |
| config NR_IRQS |
| int "Number of virtual interrupt numbers" |
| range 32 32768 |
| default "512" |
| help |
| This defines the number of virtual interrupt numbers the kernel |
| can manage. Virtual interrupt numbers are what you see in |
| /proc/interrupts. If you configure your system to have too few, |
| drivers will fail to load or worse - handle with care. |
| |
| config NMI_IPI |
| bool |
| depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR) |
| default y |
| |
| config PPC_WATCHDOG |
| bool |
| depends on HARDLOCKUP_DETECTOR |
| depends on HAVE_HARDLOCKUP_DETECTOR_ARCH |
| default y |
| help |
| This is a placeholder when the powerpc hardlockup detector |
| watchdog is selected (arch/powerpc/kernel/watchdog.c). It is |
| seleted via the generic lockup detector menu which is why we |
| have no standalone config option for it here. |
| |
| config STACKTRACE_SUPPORT |
| bool |
| default y |
| |
| config TRACE_IRQFLAGS_SUPPORT |
| bool |
| default y |
| |
| config LOCKDEP_SUPPORT |
| bool |
| default y |
| |
| config GENERIC_LOCKBREAK |
| bool |
| default y |
| depends on SMP && PREEMPTION |
| |
| config GENERIC_HWEIGHT |
| bool |
| default y |
| |
| config PPC |
| bool |
| default y |
| # |
| # Please keep this list sorted alphabetically. |
| # |
| select ARCH_32BIT_OFF_T if PPC32 |
| select ARCH_HAS_DEBUG_VIRTUAL |
| select ARCH_HAS_DEBUG_VM_PGTABLE |
| select ARCH_HAS_DEVMEM_IS_ALLOWED |
| select ARCH_HAS_ELF_RANDOMIZE |
| select ARCH_HAS_FORTIFY_SOURCE |
| select ARCH_HAS_GCOV_PROFILE_ALL |
| select ARCH_HAS_KCOV |
| select ARCH_HAS_HUGEPD if HUGETLB_PAGE |
| select ARCH_HAS_MEMREMAP_COMPAT_ALIGN |
| select ARCH_HAS_MMIOWB if PPC64 |
| select ARCH_HAS_PHYS_TO_DMA |
| select ARCH_HAS_PMEM_API |
| select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE |
| select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64 |
| select ARCH_HAS_PTE_SPECIAL |
| select ARCH_HAS_MEMBARRIER_CALLBACKS |
| select ARCH_HAS_MEMBARRIER_SYNC_CORE |
| select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64 |
| select ARCH_HAS_STRICT_KERNEL_RWX if (PPC32 && !HIBERNATION) |
| select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST |
| select ARCH_HAS_UACCESS_FLUSHCACHE |
| select ARCH_HAS_UACCESS_MCSAFE if PPC64 |
| select ARCH_HAS_UBSAN_SANITIZE_ALL |
| select ARCH_HAVE_NMI_SAFE_CMPXCHG |
| select ARCH_KEEP_MEMBLOCK |
| select ARCH_MIGHT_HAVE_PC_PARPORT |
| select ARCH_MIGHT_HAVE_PC_SERIO |
| select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX |
| select ARCH_SUPPORTS_ATOMIC_RMW |
| select ARCH_USE_BUILTIN_BSWAP |
| select ARCH_USE_CMPXCHG_LOCKREF if PPC64 |
| select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS |
| select ARCH_USE_QUEUED_SPINLOCKS if PPC_QUEUED_SPINLOCKS |
| select ARCH_WANT_IPC_PARSE_VERSION |
| select ARCH_WEAK_RELEASE_ACQUIRE |
| select BINFMT_ELF |
| select BUILDTIME_TABLE_SORT |
| select CLONE_BACKWARDS |
| select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN |
| select DMA_OPS if PPC64 |
| select DMA_OPS_BYPASS if PPC64 |
| select DYNAMIC_FTRACE if FUNCTION_TRACER |
| select EDAC_ATOMIC_SCRUB |
| select EDAC_SUPPORT |
| select GENERIC_ATOMIC64 if PPC32 |
| select GENERIC_CLOCKEVENTS |
| select GENERIC_CLOCKEVENTS_BROADCAST if SMP |
| select GENERIC_CMOS_UPDATE |
| select GENERIC_CPU_AUTOPROBE |
| select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC |
| select GENERIC_EARLY_IOREMAP |
| select GENERIC_IRQ_SHOW |
| select GENERIC_IRQ_SHOW_LEVEL |
| select GENERIC_PCI_IOMAP if PCI |
| select GENERIC_SMP_IDLE_THREAD |
| select GENERIC_STRNCPY_FROM_USER |
| select GENERIC_STRNLEN_USER |
| select GENERIC_TIME_VSYSCALL |
| select HAVE_ARCH_AUDITSYSCALL |
| select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU |
| select HAVE_ARCH_JUMP_LABEL |
| select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14 |
| select HAVE_ARCH_KASAN_VMALLOC if PPC32 && PPC_PAGE_SHIFT <= 14 |
| select HAVE_ARCH_KGDB |
| select HAVE_ARCH_MMAP_RND_BITS |
| select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT |
| select HAVE_ARCH_NVRAM_OPS |
| select HAVE_ARCH_SECCOMP_FILTER |
| select HAVE_ARCH_TRACEHOOK |
| select HAVE_ASM_MODVERSIONS |
| select HAVE_C_RECORDMCOUNT |
| select HAVE_CBPF_JIT if !PPC64 |
| select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13) |
| select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2) |
| select HAVE_CONTEXT_TRACKING if PPC64 |
| select HAVE_TIF_NOHZ if PPC64 |
| select HAVE_DEBUG_KMEMLEAK |
| select HAVE_DEBUG_STACKOVERFLOW |
| select HAVE_DYNAMIC_FTRACE |
| select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL |
| select HAVE_EBPF_JIT if PPC64 |
| select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU) |
| select HAVE_FAST_GUP |
| select HAVE_FTRACE_MCOUNT_RECORD |
| select HAVE_FUNCTION_ERROR_INJECTION |
| select HAVE_FUNCTION_GRAPH_TRACER |
| select HAVE_FUNCTION_TRACER |
| select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC |
| select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx) |
| select HAVE_IDE |
| select HAVE_IOREMAP_PROT |
| select HAVE_IRQ_EXIT_ON_IRQ_STACK |
| select HAVE_KERNEL_GZIP |
| select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE |
| select HAVE_KERNEL_LZO if DEFAULT_UIMAGE |
| select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x |
| select HAVE_KPROBES |
| select HAVE_KPROBES_ON_FTRACE |
| select HAVE_KRETPROBES |
| select HAVE_LD_DEAD_CODE_DATA_ELIMINATION |
| select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS |
| select HAVE_MOD_ARCH_SPECIFIC |
| select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S) |
| select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S) |
| select HAVE_OPROFILE |
| select HAVE_OPTPROBES if PPC64 |
| select HAVE_PERF_EVENTS |
| select HAVE_PERF_EVENTS_NMI if PPC64 |
| select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH |
| select HAVE_PERF_REGS |
| select HAVE_PERF_USER_STACK_DUMP |
| select MMU_GATHER_RCU_TABLE_FREE |
| select MMU_GATHER_PAGE_SIZE |
| select HAVE_REGS_AND_STACK_ACCESS_API |
| select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN |
| select HAVE_SYSCALL_TRACEPOINTS |
| select HAVE_VIRT_CPU_ACCOUNTING |
| select HAVE_IRQ_TIME_ACCOUNTING |
| select HAVE_RSEQ |
| select IOMMU_HELPER if PPC64 |
| select IRQ_DOMAIN |
| select IRQ_FORCED_THREADING |
| select MODULES_USE_ELF_RELA |
| select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE |
| select NEED_SG_DMA_LENGTH |
| select OF |
| select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE |
| select OF_EARLY_FLATTREE |
| select OLD_SIGACTION if PPC32 |
| select OLD_SIGSUSPEND |
| select PCI_DOMAINS if PCI |
| select PCI_SYSCALL if PCI |
| select PPC_DAWR if PPC64 |
| select RTC_LIB |
| select SPARSE_IRQ |
| select SYSCTL_EXCEPTION_TRACE |
| select THREAD_INFO_IN_TASK |
| select VIRT_TO_BUS if !PPC64 |
| # |
| # Please keep this list sorted alphabetically. |
| # |
| |
| config PPC_BARRIER_NOSPEC |
| bool |
| default y |
| depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E |
| |
| config EARLY_PRINTK |
| bool |
| default y |
| |
| config PANIC_TIMEOUT |
| int |
| default 180 |
| |
| config COMPAT |
| bool "Enable support for 32bit binaries" |
| depends on PPC64 |
| default y if !CPU_LITTLE_ENDIAN |
| select COMPAT_BINFMT_ELF |
| select ARCH_WANT_OLD_COMPAT_IPC |
| select COMPAT_OLD_SIGACTION |
| |
| config SYSVIPC_COMPAT |
| bool |
| depends on COMPAT && SYSVIPC |
| default y |
| |
| config SCHED_OMIT_FRAME_POINTER |
| bool |
| default y |
| |
| config ARCH_MAY_HAVE_PC_FDC |
| bool |
| default PCI |
| |
| config PPC_UDBG_16550 |
| bool |
| |
| config GENERIC_TBSYNC |
| bool |
| default y if PPC32 && SMP |
| |
| config AUDIT_ARCH |
| bool |
| default y |
| |
| config GENERIC_BUG |
| bool |
| default y |
| depends on BUG |
| |
| config SYS_SUPPORTS_APM_EMULATION |
| default y if PMAC_APM_EMU |
| bool |
| |
| config EPAPR_BOOT |
| bool |
| help |
| Used to allow a board to specify it wants an ePAPR compliant wrapper. |
| |
| config DEFAULT_UIMAGE |
| bool |
| help |
| Used to allow a board to specify it wants a uImage built by default |
| |
| config ARCH_HIBERNATION_POSSIBLE |
| bool |
| default y |
| |
| config ARCH_SUSPEND_POSSIBLE |
| def_bool y |
| depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \ |
| (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \ |
| || 44x || 40x |
| |
| config ARCH_SUSPEND_NONZERO_CPU |
| def_bool y |
| depends on PPC_POWERNV || PPC_PSERIES |
| |
| config PPC_DCR_NATIVE |
| bool |
| |
| config PPC_DCR_MMIO |
| bool |
| |
| config PPC_DCR |
| bool |
| depends on PPC_DCR_NATIVE || PPC_DCR_MMIO |
| default y |
| |
| config PPC_OF_PLATFORM_PCI |
| bool |
| depends on PCI |
| depends on PPC64 # not supported on 32 bits yet |
| |
| config ARCH_SUPPORTS_DEBUG_PAGEALLOC |
| depends on PPC32 || PPC_BOOK3S_64 |
| def_bool y |
| |
| config ARCH_SUPPORTS_UPROBES |
| def_bool y |
| |
| config PPC_ADV_DEBUG_REGS |
| bool |
| depends on 40x || BOOKE |
| default y |
| |
| config PPC_ADV_DEBUG_IACS |
| int |
| depends on PPC_ADV_DEBUG_REGS |
| default 4 if 44x |
| default 2 |
| |
| config PPC_ADV_DEBUG_DACS |
| int |
| depends on PPC_ADV_DEBUG_REGS |
| default 2 |
| |
| config PPC_ADV_DEBUG_DVCS |
| int |
| depends on PPC_ADV_DEBUG_REGS |
| default 2 if 44x |
| default 0 |
| |
| config PPC_ADV_DEBUG_DAC_RANGE |
| bool |
| depends on PPC_ADV_DEBUG_REGS && 44x |
| default y |
| |
| config PPC_DAWR |
| bool |
| |
| config ZONE_DMA |
| bool |
| default y if PPC_BOOK3E_64 |
| |
| config PGTABLE_LEVELS |
| int |
| default 2 if !PPC64 |
| default 4 |
| |
| source "arch/powerpc/sysdev/Kconfig" |
| source "arch/powerpc/platforms/Kconfig" |
| |
| menu "Kernel options" |
| |
| config HIGHMEM |
| bool "High memory support" |
| depends on PPC32 |
| |
| source "kernel/Kconfig.hz" |
| |
| config HUGETLB_PAGE_SIZE_VARIABLE |
| bool |
| depends on HUGETLB_PAGE && PPC_BOOK3S_64 |
| default y |
| |
| config MATH_EMULATION |
| bool "Math emulation" |
| depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE |
| help |
| Some PowerPC chips designed for embedded applications do not have |
| a floating-point unit and therefore do not implement the |
| floating-point instructions in the PowerPC instruction set. If you |
| say Y here, the kernel will include code to emulate a floating-point |
| unit, which will allow programs that use floating-point |
| instructions to run. |
| |
| This is also useful to emulate missing (optional) instructions |
| such as fsqrt on cores that do have an FPU but do not implement |
| them (such as Freescale BookE). |
| |
| choice |
| prompt "Math emulation options" |
| default MATH_EMULATION_FULL |
| depends on MATH_EMULATION |
| |
| config MATH_EMULATION_FULL |
| bool "Emulate all the floating point instructions" |
| help |
| Select this option will enable the kernel to support to emulate |
| all the floating point instructions. If your SoC doesn't have |
| a FPU, you should select this. |
| |
| config MATH_EMULATION_HW_UNIMPLEMENTED |
| bool "Just emulate the FPU unimplemented instructions" |
| help |
| Select this if you know there does have a hardware FPU on your |
| SoC, but some floating point instructions are not implemented by that. |
| |
| endchoice |
| |
| config PPC_TRANSACTIONAL_MEM |
| bool "Transactional Memory support for POWERPC" |
| depends on PPC_BOOK3S_64 |
| depends on SMP |
| select ALTIVEC |
| select VSX |
| help |
| Support user-mode Transactional Memory on POWERPC. |
| |
| config PPC_UV |
| bool "Ultravisor support" |
| depends on KVM_BOOK3S_HV_POSSIBLE |
| depends on DEVICE_PRIVATE |
| default n |
| help |
| This option paravirtualizes the kernel to run in POWER platforms that |
| supports the Protected Execution Facility (PEF). On such platforms, |
| the ultravisor firmware runs at a privilege level above the |
| hypervisor. |
| |
| If unsure, say "N". |
| |
| config LD_HEAD_STUB_CATCH |
| bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT |
| depends on PPC64 |
| help |
| Very large kernels can cause linker branch stubs to be generated by |
| code in head_64.S, which moves the head text sections out of their |
| specified location. This option can work around the problem. |
| |
| If unsure, say "N". |
| |
| config MPROFILE_KERNEL |
| depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER |
| def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__) |
| |
| config HOTPLUG_CPU |
| bool "Support for enabling/disabling CPUs" |
| depends on SMP && (PPC_PSERIES || \ |
| PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE) |
| help |
| Say Y here to be able to disable and re-enable individual |
| CPUs at runtime on SMP machines. |
| |
| Say N if you are unsure. |
| |
| config PPC_QUEUED_SPINLOCKS |
| bool "Queued spinlocks" |
| depends on SMP |
| help |
| Say Y here to use queued spinlocks which give better scalability and |
| fairness on large SMP and NUMA systems without harming single threaded |
| performance. |
| |
| This option is currently experimental, the code is more complex and |
| less tested so it defaults to "N" for the moment. |
| |
| If unsure, say "N". |
| |
| config ARCH_CPU_PROBE_RELEASE |
| def_bool y |
| depends on HOTPLUG_CPU |
| |
| config ARCH_ENABLE_MEMORY_HOTPLUG |
| def_bool y |
| |
| config ARCH_ENABLE_MEMORY_HOTREMOVE |
| def_bool y |
| |
| config PPC64_SUPPORTS_MEMORY_FAILURE |
| bool "Add support for memory hwpoison" |
| depends on PPC_BOOK3S_64 |
| default "y" if PPC_POWERNV |
| select ARCH_SUPPORTS_MEMORY_FAILURE |
| |
| config KEXEC |
| bool "kexec system call" |
| depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E |
| 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. |
| |
| It is an ongoing process to be certain the hardware in a machine |
| is properly shutdown, so do not be surprised if this code does not |
| initially work for you. As of this writing the exact hardware |
| interface is strongly in flux, so no good recommendation can be |
| made. |
| |
| config KEXEC_FILE |
| bool "kexec file based system call" |
| select KEXEC_CORE |
| select HAVE_IMA_KEXEC |
| select BUILD_BIN2C |
| select KEXEC_ELF |
| depends on PPC64 |
| depends on CRYPTO=y |
| depends on CRYPTO_SHA256=y |
| help |
| This is a new version of the kexec system call. This call is |
| file based and takes in file descriptors as system call arguments |
| for kernel and initramfs as opposed to a list of segments as is the |
| case for the older kexec call. |
| |
| config ARCH_HAS_KEXEC_PURGATORY |
| def_bool KEXEC_FILE |
| |
| config RELOCATABLE |
| bool "Build a relocatable kernel" |
| depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE)) |
| select NONSTATIC_KERNEL |
| select MODULE_REL_CRCS if MODVERSIONS |
| help |
| This builds a kernel image that is capable of running at the |
| location the kernel is loaded at. For ppc32, there is no any |
| alignment restrictions, and this feature is a superset of |
| DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use |
| 16k-aligned base address. The kernel is linked as a |
| position-independent executable (PIE) and contains dynamic relocations |
| which are processed early in the bootup process. |
| |
| One use is for the kexec on panic case where the recovery kernel |
| must live at a different physical address than the primary |
| kernel. |
| |
| Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address |
| it has been loaded at and the compile time physical addresses |
| CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START |
| setting can still be useful to bootwrappers that need to know the |
| load address of the kernel (eg. u-boot/mkimage). |
| |
| config RANDOMIZE_BASE |
| bool "Randomize the address of the kernel image" |
| depends on (FSL_BOOKE && FLATMEM && PPC32) |
| depends on RELOCATABLE |
| help |
| Randomizes the 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. |
| |
| If unsure, say Y. |
| |
| config RELOCATABLE_TEST |
| bool "Test relocatable kernel" |
| depends on (PPC64 && RELOCATABLE) |
| help |
| This runs the relocatable kernel at the address it was initially |
| loaded at, which tends to be non-zero and therefore test the |
| relocation code. |
| |
| config CRASH_DUMP |
| bool "Build a dump capture kernel" |
| depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP) |
| select RELOCATABLE if PPC64 || 44x || FSL_BOOKE |
| help |
| Build a kernel suitable for use as a dump capture kernel. |
| The same kernel binary can be used as production kernel and dump |
| capture kernel. |
| |
| config FA_DUMP |
| bool "Firmware-assisted dump" |
| depends on PPC64 && (PPC_RTAS || PPC_POWERNV) |
| select CRASH_CORE |
| select CRASH_DUMP |
| help |
| A robust mechanism to get reliable kernel crash dump with |
| assistance from firmware. This approach does not use kexec, |
| instead firmware assists in booting the capture kernel |
| while preserving memory contents. Firmware-assisted dump |
| is meant to be a kdump replacement offering robustness and |
| speed not possible without system firmware assistance. |
| |
| If unsure, say "y". Only special kernels like petitboot may |
| need to say "N" here. |
| |
| config PRESERVE_FA_DUMP |
| bool "Preserve Firmware-assisted dump" |
| depends on PPC64 && PPC_POWERNV && !FA_DUMP |
| help |
| On a kernel with FA_DUMP disabled, this option helps to preserve |
| crash data from a previously crash'ed kernel. Useful when the next |
| memory preserving kernel boot would process this crash data. |
| Petitboot kernel is the typical usecase for this option. |
| |
| config OPAL_CORE |
| bool "Export OPAL memory as /sys/firmware/opal/core" |
| depends on PPC64 && PPC_POWERNV |
| help |
| This option uses the MPIPL support in firmware to provide an |
| ELF core of OPAL memory after a crash. The ELF core is exported |
| as /sys/firmware/opal/core file which is helpful in debugging |
| OPAL crashes using GDB. |
| |
| config IRQ_ALL_CPUS |
| bool "Distribute interrupts on all CPUs by default" |
| depends on SMP |
| help |
| This option gives the kernel permission to distribute IRQs across |
| multiple CPUs. Saying N here will route all IRQs to the first |
| CPU. Generally saying Y is safe, although some problems have been |
| reported with SMP Power Macintoshes with this option enabled. |
| |
| config NUMA |
| bool "NUMA support" |
| depends on PPC64 |
| default y if SMP && PPC_PSERIES |
| |
| config NODES_SHIFT |
| int |
| default "8" if PPC64 |
| default "4" |
| depends on NEED_MULTIPLE_NODES |
| |
| config USE_PERCPU_NUMA_NODE_ID |
| def_bool y |
| depends on NUMA |
| |
| config HAVE_MEMORYLESS_NODES |
| def_bool y |
| depends on NUMA |
| |
| config ARCH_SELECT_MEMORY_MODEL |
| def_bool y |
| depends on PPC64 |
| |
| config ARCH_FLATMEM_ENABLE |
| def_bool y |
| depends on (PPC64 && !NUMA) || PPC32 |
| |
| config ARCH_SPARSEMEM_ENABLE |
| def_bool y |
| depends on PPC64 |
| select SPARSEMEM_VMEMMAP_ENABLE |
| |
| config ARCH_SPARSEMEM_DEFAULT |
| def_bool y |
| depends on PPC_BOOK3S_64 |
| |
| config SYS_SUPPORTS_HUGETLBFS |
| bool |
| |
| config ILLEGAL_POINTER_VALUE |
| hex |
| # This is roughly half way between the top of user space and the bottom |
| # of kernel space, which seems about as good as we can get. |
| default 0x5deadbeef0000000 if PPC64 |
| default 0 |
| |
| config ARCH_MEMORY_PROBE |
| def_bool y |
| depends on MEMORY_HOTPLUG |
| |
| config STDBINUTILS |
| bool "Using standard binutils settings" |
| depends on 44x |
| default y |
| help |
| Turning this option off allows you to select 256KB PAGE_SIZE on 44x. |
| Note, that kernel will be able to run only those applications, |
| which had been compiled using binutils later than 2.17.50.0.3 with |
| '-zmax-page-size' set to 256K (the default is 64K). Or, if using |
| the older binutils, you can patch them with a trivial patch, which |
| changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000. |
| |
| choice |
| prompt "Page size" |
| default PPC_4K_PAGES |
| help |
| Select the kernel logical page size. Increasing the page size |
| will reduce software overhead at each page boundary, allow |
| hardware prefetch mechanisms to be more effective, and allow |
| larger dma transfers increasing IO efficiency and reducing |
| overhead. However the utilization of memory will increase. |
| For example, each cached file will using a multiple of the |
| page size to hold its contents and the difference between the |
| end of file and the end of page is wasted. |
| |
| Some dedicated systems, such as software raid serving with |
| accelerated calculations, have shown significant increases. |
| |
| If you configure a 64 bit kernel for 64k pages but the |
| processor does not support them, then the kernel will simulate |
| them with 4k pages, loading them on demand, but with the |
| reduced software overhead and larger internal fragmentation. |
| For the 32 bit kernel, a large page option will not be offered |
| unless it is supported by the configured processor. |
| |
| If unsure, choose 4K_PAGES. |
| |
| config PPC_4K_PAGES |
| bool "4k page size" |
| select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 |
| |
| config PPC_16K_PAGES |
| bool "16k page size" |
| depends on 44x || PPC_8xx |
| |
| config PPC_64K_PAGES |
| bool "64k page size" |
| depends on 44x || PPC_BOOK3S_64 |
| select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 |
| |
| config PPC_256K_PAGES |
| bool "256k page size" |
| depends on 44x && !STDBINUTILS |
| help |
| Make the page size 256k. |
| |
| As the ELF standard only requires alignment to support page |
| sizes up to 64k, you will need to compile all of your user |
| space applications with a non-standard binutils settings |
| (see the STDBINUTILS description for details). |
| |
| Say N unless you know what you are doing. |
| |
| endchoice |
| |
| config PPC_PAGE_SHIFT |
| int |
| default 18 if PPC_256K_PAGES |
| default 16 if PPC_64K_PAGES |
| default 14 if PPC_16K_PAGES |
| default 12 |
| |
| config THREAD_SHIFT |
| int "Thread shift" if EXPERT |
| range 13 15 |
| default "15" if PPC_256K_PAGES |
| default "14" if PPC64 |
| default "14" if KASAN |
| default "13" |
| help |
| Used to define the stack size. The default is almost always what you |
| want. Only change this if you know what you are doing. |
| |
| config DATA_SHIFT_BOOL |
| bool "Set custom data alignment" |
| depends on ADVANCED_OPTIONS |
| depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC |
| depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && \ |
| (!PIN_TLB_TEXT || !STRICT_KERNEL_RWX)) |
| help |
| This option allows you to set the kernel data alignment. When |
| RAM is mapped by blocks, the alignment needs to fit the size and |
| number of possible blocks. The default should be OK for most configs. |
| |
| Say N here unless you know what you are doing. |
| |
| config DATA_SHIFT |
| int "Data shift" if DATA_SHIFT_BOOL |
| default 24 if STRICT_KERNEL_RWX && PPC64 |
| range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_BOOK3S_32 |
| range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_8xx |
| default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32 |
| default 18 if DEBUG_PAGEALLOC && PPC_BOOK3S_32 |
| default 23 if STRICT_KERNEL_RWX && PPC_8xx |
| default 23 if DEBUG_PAGEALLOC && PPC_8xx && PIN_TLB_DATA |
| default 19 if DEBUG_PAGEALLOC && PPC_8xx |
| default PPC_PAGE_SHIFT |
| help |
| On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO. |
| Smaller is the alignment, greater is the number of necessary DBATs. |
| |
| On 8xx, large pages (512kb or 8M) are used to map kernel linear |
| memory. Aligning to 8M reduces TLB misses as only 8M pages are used |
| in that case. If PIN_TLB is selected, it must be aligned to 8M as |
| 8M pages will be pinned. |
| |
| config FORCE_MAX_ZONEORDER |
| int "Maximum zone order" |
| range 8 9 if PPC64 && PPC_64K_PAGES |
| default "9" if PPC64 && PPC_64K_PAGES |
| range 13 13 if PPC64 && !PPC_64K_PAGES |
| default "13" if PPC64 && !PPC_64K_PAGES |
| range 9 64 if PPC32 && PPC_16K_PAGES |
| default "9" if PPC32 && PPC_16K_PAGES |
| range 7 64 if PPC32 && PPC_64K_PAGES |
| default "7" if PPC32 && PPC_64K_PAGES |
| range 5 64 if PPC32 && PPC_256K_PAGES |
| default "5" if PPC32 && PPC_256K_PAGES |
| range 11 64 |
| default "11" |
| 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. |
| |
| This config option is actually maximum order plus one. For example, |
| a value of 11 means that the largest free memory block is 2^10 pages. |
| |
| The page size is not necessarily 4KB. For example, on 64-bit |
| systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep |
| this in mind when choosing a value for this option. |
| |
| config PPC_SUBPAGE_PROT |
| bool "Support setting protections for 4k subpages (subpage_prot syscall)" |
| default n |
| depends on PPC_BOOK3S_64 && PPC_64K_PAGES |
| help |
| This option adds support for system call to allow user programs |
| to set access permissions (read/write, readonly, or no access) |
| on the 4k subpages of each 64k page. |
| |
| If unsure, say N here. |
| |
| config PPC_COPRO_BASE |
| bool |
| |
| config SCHED_SMT |
| bool "SMT (Hyperthreading) scheduler support" |
| depends on PPC64 && SMP |
| help |
| SMT scheduler support improves the CPU scheduler's decision making |
| when dealing with POWER5 cpus at a cost of slightly increased |
| overhead in some places. If unsure say N here. |
| |
| config PPC_DENORMALISATION |
| bool "PowerPC denormalisation exception handling" |
| depends on PPC_BOOK3S_64 |
| default "y" if PPC_POWERNV |
| help |
| Add support for handling denormalisation of single precision |
| values. Useful for bare metal only. If unsure say Y here. |
| |
| config CMDLINE |
| string "Initial kernel command string" |
| default "" |
| help |
| On some platforms, there is currently no way for the boot loader to |
| pass arguments to the kernel. For these platforms, you can supply |
| some command-line options at build time by entering them here. In |
| most cases you will need to specify the root device here. |
| |
| choice |
| prompt "Kernel command line type" if CMDLINE != "" |
| default CMDLINE_FROM_BOOTLOADER |
| |
| config CMDLINE_FROM_BOOTLOADER |
| bool "Use bootloader kernel arguments if available" |
| help |
| Uses the command-line options passed by the boot loader. If |
| the boot loader doesn't provide any, the default kernel command |
| string provided in CMDLINE will be used. |
| |
| config CMDLINE_EXTEND |
| bool "Extend bootloader kernel arguments" |
| help |
| The command-line arguments provided by the boot loader will be |
| appended to the default kernel command string. |
| |
| 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. |
| |
| endchoice |
| |
| config EXTRA_TARGETS |
| string "Additional default image types" |
| help |
| List additional targets to be built by the bootwrapper here (separated |
| by spaces). This is useful for targets that depend of device tree |
| files in the .dts directory. |
| |
| Targets in this list will be build as part of the default build |
| target, or when the user does a 'make zImage' or a |
| 'make zImage.initrd'. |
| |
| If unsure, leave blank |
| |
| config ARCH_WANTS_FREEZER_CONTROL |
| def_bool y |
| depends on ADB_PMU |
| |
| source "kernel/power/Kconfig" |
| |
| 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/<pid>/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. |
| |
| config PPC_MEM_KEYS |
| prompt "PowerPC Memory Protection Keys" |
| def_bool y |
| depends on PPC_BOOK3S_64 |
| select ARCH_USES_HIGH_VMA_FLAGS |
| select ARCH_HAS_PKEYS |
| help |
| Memory Protection Keys provides a mechanism for enforcing |
| page-based protections, but without requiring modification of the |
| page tables when an application changes protection domains. |
| |
| For details, see Documentation/core-api/protection-keys.rst |
| |
| If unsure, say y. |
| |
| config PPC_SECURE_BOOT |
| prompt "Enable secure boot support" |
| bool |
| depends on PPC_POWERNV |
| depends on IMA_ARCH_POLICY |
| imply IMA_SECURE_AND_OR_TRUSTED_BOOT |
| help |
| Systems with firmware secure boot enabled need to define security |
| policies to extend secure boot to the OS. This config allows a user |
| to enable OS secure boot on systems that have firmware support for |
| it. If in doubt say N. |
| |
| config PPC_SECVAR_SYSFS |
| bool "Enable sysfs interface for POWER secure variables" |
| default y |
| depends on PPC_SECURE_BOOT |
| depends on SYSFS |
| help |
| POWER secure variables are managed and controlled by firmware. |
| These variables are exposed to userspace via sysfs to enable |
| read/write operations on these variables. Say Y if you have |
| secure boot enabled and want to expose variables to userspace. |
| |
| endmenu |
| |
| config ISA_DMA_API |
| bool |
| default PCI |
| |
| menu "Bus options" |
| |
| config ISA |
| bool "Support for ISA-bus hardware" |
| depends on PPC_CHRP |
| select PPC_I8259 |
| help |
| Find out whether you have ISA slots on your motherboard. ISA is the |
| name of a bus system, i.e. the way the CPU talks to the other stuff |
| inside your box. If you have an Apple machine, say N here; if you |
| have an IBM RS/6000 or pSeries machine, say Y. If you have an |
| embedded board, consult your board documentation. |
| |
| config GENERIC_ISA_DMA |
| bool |
| depends on ISA_DMA_API |
| default y |
| |
| config PPC_INDIRECT_PCI |
| bool |
| depends on PCI |
| default y if 40x || 44x |
| |
| config SBUS |
| bool |
| |
| config FSL_SOC |
| bool |
| |
| config FSL_PCI |
| bool |
| select ARCH_HAS_DMA_SET_MASK |
| select PPC_INDIRECT_PCI |
| select PCI_QUIRKS |
| |
| config FSL_PMC |
| bool |
| default y |
| depends on SUSPEND && (PPC_85xx || PPC_86xx) |
| help |
| Freescale MPC85xx/MPC86xx power management controller support |
| (suspend/resume). For MPC83xx see platforms/83xx/suspend.c |
| |
| config PPC4xx_CPM |
| bool |
| default y |
| depends on SUSPEND && (44x || 40x) |
| help |
| PPC4xx Clock Power Management (CPM) support (suspend/resume). |
| It also enables support for two different idle states (idle-wait |
| and idle-doze). |
| |
| config 4xx_SOC |
| bool |
| |
| config FSL_LBC |
| bool "Freescale Local Bus support" |
| help |
| Enables reporting of errors from the Freescale local bus |
| controller. Also contains some common code used by |
| drivers for specific local bus peripherals. |
| |
| config FSL_GTM |
| bool |
| depends on PPC_83xx || QUICC_ENGINE || CPM2 |
| help |
| Freescale General-purpose Timers support |
| |
| config PCI_8260 |
| bool |
| depends on PCI && 8260 |
| select PPC_INDIRECT_PCI |
| default y |
| |
| config FSL_RIO |
| bool "Freescale Embedded SRIO Controller support" |
| depends on RAPIDIO = y && HAVE_RAPIDIO |
| default "n" |
| help |
| Include support for RapidIO controller on Freescale embedded |
| processors (MPC8548, MPC8641, etc). |
| |
| endmenu |
| |
| config NONSTATIC_KERNEL |
| bool |
| |
| menu "Advanced setup" |
| depends on PPC32 |
| |
| config ADVANCED_OPTIONS |
| bool "Prompt for advanced kernel configuration options" |
| help |
| This option will enable prompting for a variety of advanced kernel |
| configuration options. These options can cause the kernel to not |
| work if they are set incorrectly, but can be used to optimize certain |
| aspects of kernel memory management. |
| |
| Unless you know what you are doing, say N here. |
| |
| comment "Default settings for advanced configuration options are used" |
| depends on !ADVANCED_OPTIONS |
| |
| config LOWMEM_SIZE_BOOL |
| bool "Set maximum low memory" |
| depends on ADVANCED_OPTIONS |
| help |
| This option allows you to set the maximum amount of memory which |
| will be used as "low memory", that is, memory which the kernel can |
| access directly, without having to set up a kernel virtual mapping. |
| This can be useful in optimizing the layout of kernel virtual |
| memory. |
| |
| Say N here unless you know what you are doing. |
| |
| config LOWMEM_SIZE |
| hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL |
| default "0x30000000" |
| |
| config LOWMEM_CAM_NUM_BOOL |
| bool "Set number of CAMs to use to map low memory" |
| depends on ADVANCED_OPTIONS && FSL_BOOKE |
| help |
| This option allows you to set the maximum number of CAM slots that |
| will be used to map low memory. There are a limited number of slots |
| available and even more limited number that will fit in the L1 MMU. |
| However, using more entries will allow mapping more low memory. This |
| can be useful in optimizing the layout of kernel virtual memory. |
| |
| Say N here unless you know what you are doing. |
| |
| config LOWMEM_CAM_NUM |
| depends on FSL_BOOKE |
| int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL |
| default 3 |
| |
| config DYNAMIC_MEMSTART |
| bool "Enable page aligned dynamic load address for kernel" |
| depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x) |
| select NONSTATIC_KERNEL |
| help |
| This option enables the kernel to be loaded at any page aligned |
| physical address. The kernel creates a mapping from KERNELBASE to |
| the address where the kernel is loaded. The page size here implies |
| the TLB page size of the mapping for kernel on the particular platform. |
| Please refer to the init code for finding the TLB page size. |
| |
| DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE |
| kernel image, where the only restriction is the page aligned kernel |
| load address. When this option is enabled, the compile time physical |
| address CONFIG_PHYSICAL_START is ignored. |
| |
| This option is overridden by CONFIG_RELOCATABLE |
| |
| config PAGE_OFFSET_BOOL |
| bool "Set custom page offset address" |
| depends on ADVANCED_OPTIONS |
| help |
| This option allows you to set the kernel virtual address at which |
| the kernel will map low memory. This can be useful in optimizing |
| the virtual memory layout of the system. |
| |
| Say N here unless you know what you are doing. |
| |
| config PAGE_OFFSET |
| hex "Virtual address of memory base" if PAGE_OFFSET_BOOL |
| default "0xc0000000" |
| |
| config KERNEL_START_BOOL |
| bool "Set custom kernel base address" |
| depends on ADVANCED_OPTIONS |
| help |
| This option allows you to set the kernel virtual address at which |
| the kernel will be loaded. Normally this should match PAGE_OFFSET |
| however there are times (like kdump) that one might not want them |
| to be the same. |
| |
| Say N here unless you know what you are doing. |
| |
| config KERNEL_START |
| hex "Virtual address of kernel base" if KERNEL_START_BOOL |
| default PAGE_OFFSET if PAGE_OFFSET_BOOL |
| default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL |
| default "0xc0000000" |
| |
| config PHYSICAL_START_BOOL |
| bool "Set physical address where the kernel is loaded" |
| depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE |
| help |
| This gives the physical address where the kernel is loaded. |
| |
| Say N here unless you know what you are doing. |
| |
| config PHYSICAL_START |
| hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL |
| default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL |
| default "0x00000000" |
| |
| config PHYSICAL_ALIGN |
| hex |
| default "0x04000000" if FSL_BOOKE |
| help |
| This value puts the alignment restrictions on physical address |
| where kernel is loaded and run from. Kernel is compiled for an |
| address which meets above alignment restriction. |
| |
| config TASK_SIZE_BOOL |
| bool "Set custom user task size" |
| depends on ADVANCED_OPTIONS |
| help |
| This option allows you to set the amount of virtual address space |
| allocated to user tasks. This can be useful in optimizing the |
| virtual memory layout of the system. |
| |
| Say N here unless you know what you are doing. |
| |
| config TASK_SIZE |
| hex "Size of user task space" if TASK_SIZE_BOOL |
| default "0x80000000" if PPC_8xx |
| default "0xb0000000" if PPC_BOOK3S_32 && STRICT_KERNEL_RWX |
| default "0xc0000000" |
| endmenu |
| |
| if PPC64 |
| # This value must have zeroes in the bottom 60 bits otherwise lots will break |
| config PAGE_OFFSET |
| hex |
| default "0xc000000000000000" |
| config KERNEL_START |
| hex |
| default "0xc000000000000000" |
| config PHYSICAL_START |
| hex |
| default "0x00000000" |
| endif |
| |
| config ARCH_RANDOM |
| def_bool n |
| |
| config PPC_LIB_RHEAP |
| bool |
| |
| source "arch/powerpc/kvm/Kconfig" |
| |
| source "kernel/livepatch/Kconfig" |