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Diffstat (limited to 'arch/powerpc/Kconfig')
| -rw-r--r-- | arch/powerpc/Kconfig | 1254 |
1 files changed, 1254 insertions, 0 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig new file mode 100644 index 000000000..78dd6be8b --- /dev/null +++ b/arch/powerpc/Kconfig @@ -0,0 +1,1254 @@ +# 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 y if PPC64 + +config NEED_PER_CPU_PAGE_FIRST_CHUNK + def_bool y if 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_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_COPY_MC 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_WANT_IRQS_OFF_ACTIVATE_MM + select ARCH_WANT_LD_ORPHAN_WARN + 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 && SMP + 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_MSI_ARCH_FALLBACKS if PCI_MSI + 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 && !PPC_47x + 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 "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_PROT_SAO_LPAR + bool "Support PROT_SAO mappings in LPARs" + depends on PPC_BOOK3S_64 + help + This option adds support for PROT_SAO mappings from userspace + inside LPARs on supported CPUs. + + This may cause issues when performing guest migration from + a CPU that supports SAO to one that does not. + + 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 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 || PPC_PSERIES + 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. + +config PPC_RTAS_FILTER + bool "Enable filtering of RTAS syscalls" + default y + depends on PPC_RTAS + help + The RTAS syscall API has security issues that could be used to + compromise system integrity. This option enforces restrictions on the + RTAS calls and arguments passed by userspace programs to mitigate + these issues. + + Say Y unless you know what you are doing and the filter is causing + problems for you. + +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" |