1 # SPDX-License-Identifier: GPL-2.0
2 source "arch/powerpc/platforms/Kconfig.cputype"
16 config ARCH_PHYS_ADDR_T_64BIT
17 def_bool PPC64 || PHYS_64BIT
19 config ARCH_DMA_ADDR_T_64BIT
20 def_bool ARCH_PHYS_ADDR_T_64BIT
26 config ARCH_MMAP_RND_BITS_MAX
27 # On Book3S 64, the default virtual address space for 64-bit processes
28 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
29 # 32T of address space (2^45), which should ensure a reasonable gap
30 # between bottom-up and top-down allocations for applications that
31 # consume "normal" amounts of address space. Book3S 64 only supports 64K
33 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
34 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K)
36 # On all other 64-bit platforms (currently only Book3E), the virtual
37 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
38 # of address space (2^44). Only 4K page sizes are supported.
39 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K)
41 # For 32-bit, use the compat values, as they're the same.
42 default ARCH_MMAP_RND_COMPAT_BITS_MAX
44 config ARCH_MMAP_RND_BITS_MIN
45 # Allow randomisation to consume up to 1GB of address space (2^30).
46 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K)
47 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K)
49 # For 32-bit, use the compat values, as they're the same.
50 default ARCH_MMAP_RND_COMPAT_BITS_MIN
52 config ARCH_MMAP_RND_COMPAT_BITS_MAX
53 # Total virtual address space for 32-bit processes is 2^31 (2GB).
54 # Allow randomisation to consume up to 512MB of address space (2^29).
55 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K)
56 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K)
57 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K)
58 default 17 # 17 = 29 (512MB) - 12 (4K)
60 config ARCH_MMAP_RND_COMPAT_BITS_MIN
61 # Total virtual address space for 32-bit processes is 2^31 (2GB).
62 # Allow randomisation to consume up to 8MB of address space (2^23).
63 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K)
64 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K)
65 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K)
66 default 11 # 11 = 23 (8MB) - 12 (4K)
68 config HAVE_SETUP_PER_CPU_AREA
71 config NEED_PER_CPU_EMBED_FIRST_CHUNK
75 int "Number of virtual interrupt numbers"
79 This defines the number of virtual interrupt numbers the kernel
80 can manage. Virtual interrupt numbers are what you see in
81 /proc/interrupts. If you configure your system to have too few,
82 drivers will fail to load or worse - handle with care.
86 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
91 depends on HARDLOCKUP_DETECTOR
92 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
95 This is a placeholder when the powerpc hardlockup detector
96 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
97 seleted via the generic lockup detector menu which is why we
98 have no standalone config option for it here.
100 config STACKTRACE_SUPPORT
104 config TRACE_IRQFLAGS_SUPPORT
108 config LOCKDEP_SUPPORT
112 config RWSEM_GENERIC_SPINLOCK
115 config RWSEM_XCHGADD_ALGORITHM
119 config GENERIC_LOCKBREAK
122 depends on SMP && PREEMPT
124 config GENERIC_HWEIGHT
128 config ARCH_HAS_DMA_SET_COHERENT_MASK
135 # Please keep this list sorted alphabetically.
137 select ARCH_HAS_DEVMEM_IS_ALLOWED
138 select ARCH_HAS_DMA_SET_COHERENT_MASK
139 select ARCH_HAS_ELF_RANDOMIZE
140 select ARCH_HAS_FORTIFY_SOURCE
141 select ARCH_HAS_GCOV_PROFILE_ALL
142 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE
143 select ARCH_HAS_SG_CHAIN
144 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
145 select ARCH_HAS_UBSAN_SANITIZE_ALL
146 select ARCH_HAS_ZONE_DEVICE if PPC_BOOK3S_64
147 select ARCH_HAVE_NMI_SAFE_CMPXCHG
148 select ARCH_MIGHT_HAVE_PC_PARPORT
149 select ARCH_MIGHT_HAVE_PC_SERIO
150 select ARCH_SUPPORTS_ATOMIC_RMW
151 select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
152 select ARCH_USE_BUILTIN_BSWAP
153 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
154 select ARCH_WANT_IPC_PARSE_VERSION
155 select ARCH_WEAK_RELEASE_ACQUIRE
157 select BUILDTIME_EXTABLE_SORT
158 select CLONE_BACKWARDS
159 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
160 select EDAC_ATOMIC_SCRUB
162 select GENERIC_ATOMIC64 if PPC32
163 select GENERIC_CLOCKEVENTS
164 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
165 select GENERIC_CMOS_UPDATE
166 select GENERIC_CPU_AUTOPROBE
167 select GENERIC_IRQ_SHOW
168 select GENERIC_IRQ_SHOW_LEVEL
169 select GENERIC_SMP_IDLE_THREAD
170 select GENERIC_STRNCPY_FROM_USER
171 select GENERIC_STRNLEN_USER
172 select GENERIC_TIME_VSYSCALL
173 select HAVE_ARCH_AUDITSYSCALL
174 select HAVE_ARCH_JUMP_LABEL
175 select HAVE_ARCH_KGDB
176 select HAVE_ARCH_MMAP_RND_BITS
177 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
178 select HAVE_ARCH_SECCOMP_FILTER
179 select HAVE_ARCH_TRACEHOOK
180 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION)
181 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
182 select HAVE_CBPF_JIT if !PPC64
183 select HAVE_CONTEXT_TRACKING if PPC64
184 select HAVE_DEBUG_KMEMLEAK
185 select HAVE_DEBUG_STACKOVERFLOW
186 select HAVE_DMA_API_DEBUG
187 select HAVE_DYNAMIC_FTRACE
188 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
189 select HAVE_EBPF_JIT if PPC64
190 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
191 select HAVE_FTRACE_MCOUNT_RECORD
192 select HAVE_FUNCTION_GRAPH_TRACER
193 select HAVE_FUNCTION_TRACER
194 select HAVE_GCC_PLUGINS
195 select HAVE_GENERIC_GUP
196 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
198 select HAVE_IOREMAP_PROT
199 select HAVE_IRQ_EXIT_ON_IRQ_STACK
200 select HAVE_KERNEL_GZIP
202 select HAVE_KPROBES_ON_FTRACE
203 select HAVE_KRETPROBES
204 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
206 select HAVE_MEMBLOCK_NODE_MAP
207 select HAVE_MOD_ARCH_SPECIFIC
208 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
209 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
211 select HAVE_OPTPROBES if PPC64
212 select HAVE_PERF_EVENTS
213 select HAVE_PERF_EVENTS_NMI if PPC64
214 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
215 select HAVE_PERF_REGS
216 select HAVE_PERF_USER_STACK_DUMP
217 select HAVE_RCU_TABLE_FREE if SMP
218 select HAVE_REGS_AND_STACK_ACCESS_API
219 select HAVE_SYSCALL_TRACEPOINTS
220 select HAVE_VIRT_CPU_ACCOUNTING
221 select HAVE_IRQ_TIME_ACCOUNTING
223 select IRQ_FORCED_THREADING
224 select MODULES_USE_ELF_RELA
227 select OF_EARLY_FLATTREE
228 select OF_RESERVED_MEM
229 select OLD_SIGACTION if PPC32
230 select OLD_SIGSUSPEND
232 select SYSCTL_EXCEPTION_TRACE
233 select VIRT_TO_BUS if !PPC64
235 # Please keep this list sorted alphabetically.
252 select COMPAT_BINFMT_ELF
253 select ARCH_WANT_OLD_COMPAT_IPC
254 select COMPAT_OLD_SIGACTION
256 config SYSVIPC_COMPAT
258 depends on COMPAT && SYSVIPC
261 # All PPC32s use generic nvram driver through ppc_md
266 config SCHED_OMIT_FRAME_POINTER
270 config ARCH_MAY_HAVE_PC_FDC
274 config PPC_UDBG_16550
278 config GENERIC_TBSYNC
280 default y if PPC32 && SMP
292 config SYS_SUPPORTS_APM_EMULATION
293 default y if PMAC_APM_EMU
299 Used to allow a board to specify it wants an ePAPR compliant wrapper.
302 config DEFAULT_UIMAGE
305 Used to allow a board to specify it wants a uImage built by default
308 config ARCH_HIBERNATION_POSSIBLE
312 config ARCH_SUSPEND_POSSIBLE
314 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
315 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
318 config PPC_DCR_NATIVE
328 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
331 config PPC_OF_PLATFORM_PCI
334 depends on PPC64 # not supported on 32 bits yet
337 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
338 depends on PPC32 || PPC_STD_MMU_64
341 config ARCH_SUPPORTS_UPROBES
344 config PPC_ADV_DEBUG_REGS
346 depends on 40x || BOOKE
349 config PPC_ADV_DEBUG_IACS
351 depends on PPC_ADV_DEBUG_REGS
355 config PPC_ADV_DEBUG_DACS
357 depends on PPC_ADV_DEBUG_REGS
360 config PPC_ADV_DEBUG_DVCS
362 depends on PPC_ADV_DEBUG_REGS
366 config PPC_ADV_DEBUG_DAC_RANGE
368 depends on PPC_ADV_DEBUG_REGS && 44x
375 config PGTABLE_LEVELS
378 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
381 source "init/Kconfig"
383 source "kernel/Kconfig.freezer"
385 source "arch/powerpc/sysdev/Kconfig"
386 source "arch/powerpc/platforms/Kconfig"
388 menu "Kernel options"
391 bool "High memory support"
394 source kernel/Kconfig.hz
395 source kernel/Kconfig.preempt
396 source "fs/Kconfig.binfmt"
398 config HUGETLB_PAGE_SIZE_VARIABLE
400 depends on HUGETLB_PAGE
403 config MATH_EMULATION
404 bool "Math emulation"
405 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
407 Some PowerPC chips designed for embedded applications do not have
408 a floating-point unit and therefore do not implement the
409 floating-point instructions in the PowerPC instruction set. If you
410 say Y here, the kernel will include code to emulate a floating-point
411 unit, which will allow programs that use floating-point
414 This is also useful to emulate missing (optional) instructions
415 such as fsqrt on cores that do have an FPU but do not implement
416 them (such as Freescale BookE).
419 prompt "Math emulation options"
420 default MATH_EMULATION_FULL
421 depends on MATH_EMULATION
423 config MATH_EMULATION_FULL
424 bool "Emulate all the floating point instructions"
426 Select this option will enable the kernel to support to emulate
427 all the floating point instructions. If your SoC doesn't have
428 a FPU, you should select this.
430 config MATH_EMULATION_HW_UNIMPLEMENTED
431 bool "Just emulate the FPU unimplemented instructions"
433 Select this if you know there does have a hardware FPU on your
434 SoC, but some floating point instructions are not implemented by that.
438 config PPC_TRANSACTIONAL_MEM
439 bool "Transactional Memory support for POWERPC"
440 depends on PPC_BOOK3S_64
446 Support user-mode Transactional Memory on POWERPC.
448 config LD_HEAD_STUB_CATCH
449 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
453 Very large kernels can cause linker branch stubs to be generated by
454 code in head_64.S, which moves the head text sections out of their
455 specified location. This option can work around the problem.
459 config DISABLE_MPROFILE_KERNEL
460 bool "Disable use of mprofile-kernel for kernel tracing"
461 depends on PPC64 && CPU_LITTLE_ENDIAN
464 Selecting this options disables use of the mprofile-kernel ABI for
465 kernel tracing. That will cause options such as live patching
466 (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
469 If you have a toolchain which supports mprofile-kernel, then you can
470 disable this. Otherwise leave it enabled. If you're not sure, say
473 config MPROFILE_KERNEL
474 depends on PPC64 && CPU_LITTLE_ENDIAN
475 def_bool !DISABLE_MPROFILE_KERNEL
481 bool "SWIOTLB support"
485 Support for IO bounce buffering for systems without an IOMMU.
486 This allows us to DMA to the full physical address space on
487 platforms where the size of a physical address is larger
488 than the bus address. Not all platforms support this.
491 bool "Support for enabling/disabling CPUs"
492 depends on SMP && (PPC_PSERIES || \
493 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
495 Say Y here to be able to disable and re-enable individual
496 CPUs at runtime on SMP machines.
498 Say N if you are unsure.
500 config ARCH_CPU_PROBE_RELEASE
502 depends on HOTPLUG_CPU
504 config ARCH_ENABLE_MEMORY_HOTPLUG
507 config ARCH_HAS_WALK_MEMORY
510 config ARCH_ENABLE_MEMORY_HOTREMOVE
513 config PPC64_SUPPORTS_MEMORY_FAILURE
514 bool "Add support for memory hwpoison"
515 depends on PPC_BOOK3S_64
516 default "y" if PPC_POWERNV
517 select ARCH_SUPPORTS_MEMORY_FAILURE
520 bool "kexec system call"
521 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
524 kexec is a system call that implements the ability to shutdown your
525 current kernel, and to start another kernel. It is like a reboot
526 but it is independent of the system firmware. And like a reboot
527 you can start any kernel with it, not just Linux.
529 The name comes from the similarity to the exec system call.
531 It is an ongoing process to be certain the hardware in a machine
532 is properly shutdown, so do not be surprised if this code does not
533 initially work for you. As of this writing the exact hardware
534 interface is strongly in flux, so no good recommendation can be
538 bool "kexec file based system call"
540 select HAVE_IMA_KEXEC
544 depends on CRYPTO_SHA256=y
546 This is a new version of the kexec system call. This call is
547 file based and takes in file descriptors as system call arguments
548 for kernel and initramfs as opposed to a list of segments as is the
549 case for the older kexec call.
552 bool "Build a relocatable kernel"
553 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
554 select NONSTATIC_KERNEL
555 select MODULE_REL_CRCS if MODVERSIONS
557 This builds a kernel image that is capable of running at the
558 location the kernel is loaded at. For ppc32, there is no any
559 alignment restrictions, and this feature is a superset of
560 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
561 16k-aligned base address. The kernel is linked as a
562 position-independent executable (PIE) and contains dynamic relocations
563 which are processed early in the bootup process.
565 One use is for the kexec on panic case where the recovery kernel
566 must live at a different physical address than the primary
569 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
570 it has been loaded at and the compile time physical addresses
571 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
572 setting can still be useful to bootwrappers that need to know the
573 load address of the kernel (eg. u-boot/mkimage).
575 config RELOCATABLE_TEST
576 bool "Test relocatable kernel"
577 depends on (PPC64 && RELOCATABLE)
580 This runs the relocatable kernel at the address it was initially
581 loaded at, which tends to be non-zero and therefore test the
585 bool "Build a dump capture kernel"
586 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
587 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
589 Build a kernel suitable for use as a dump capture kernel.
590 The same kernel binary can be used as production kernel and dump
594 bool "Firmware-assisted dump"
595 depends on PPC64 && PPC_RTAS
599 A robust mechanism to get reliable kernel crash dump with
600 assistance from firmware. This approach does not use kexec,
601 instead firmware assists in booting the capture kernel
602 while preserving memory contents. Firmware-assisted dump
603 is meant to be a kdump replacement offering robustness and
604 speed not possible without system firmware assistance.
609 bool "Distribute interrupts on all CPUs by default"
612 This option gives the kernel permission to distribute IRQs across
613 multiple CPUs. Saying N here will route all IRQs to the first
614 CPU. Generally saying Y is safe, although some problems have been
615 reported with SMP Power Macintoshes with this option enabled.
620 default y if SMP && PPC_PSERIES
626 depends on NEED_MULTIPLE_NODES
628 config USE_PERCPU_NUMA_NODE_ID
632 config HAVE_MEMORYLESS_NODES
636 config ARCH_SELECT_MEMORY_MODEL
640 config ARCH_FLATMEM_ENABLE
642 depends on (PPC64 && !NUMA) || PPC32
644 config ARCH_SPARSEMEM_ENABLE
647 select SPARSEMEM_VMEMMAP_ENABLE
649 config ARCH_SPARSEMEM_DEFAULT
651 depends on PPC_BOOK3S_64
653 config SYS_SUPPORTS_HUGETLBFS
656 config ILLEGAL_POINTER_VALUE
658 # This is roughly half way between the top of user space and the bottom
659 # of kernel space, which seems about as good as we can get.
660 default 0x5deadbeef0000000 if PPC64
665 config ARCH_MEMORY_PROBE
667 depends on MEMORY_HOTPLUG
669 # Some NUMA nodes have memory ranges that span
670 # other nodes. Even though a pfn is valid and
671 # between a node's start and end pfns, it may not
672 # reside on that node. See memmap_init_zone()
674 config NODES_SPAN_OTHER_NODES
676 depends on NEED_MULTIPLE_NODES
679 bool "Using standard binutils settings"
683 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
684 Note, that kernel will be able to run only those applications,
685 which had been compiled using binutils later than 2.17.50.0.3 with
686 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
687 the older binutils, you can patch them with a trivial patch, which
688 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
694 Select the kernel logical page size. Increasing the page size
695 will reduce software overhead at each page boundary, allow
696 hardware prefetch mechanisms to be more effective, and allow
697 larger dma transfers increasing IO efficiency and reducing
698 overhead. However the utilization of memory will increase.
699 For example, each cached file will using a multiple of the
700 page size to hold its contents and the difference between the
701 end of file and the end of page is wasted.
703 Some dedicated systems, such as software raid serving with
704 accelerated calculations, have shown significant increases.
706 If you configure a 64 bit kernel for 64k pages but the
707 processor does not support them, then the kernel will simulate
708 them with 4k pages, loading them on demand, but with the
709 reduced software overhead and larger internal fragmentation.
710 For the 32 bit kernel, a large page option will not be offered
711 unless it is supported by the configured processor.
713 If unsure, choose 4K_PAGES.
717 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
721 depends on 44x || PPC_8xx
725 depends on !PPC_FSL_BOOK3E && (44x || PPC_STD_MMU_64 || PPC_BOOK3E_64)
726 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
728 config PPC_256K_PAGES
729 bool "256k page size"
730 depends on 44x && !STDBINUTILS
732 Make the page size 256k.
734 As the ELF standard only requires alignment to support page
735 sizes up to 64k, you will need to compile all of your user
736 space applications with a non-standard binutils settings
737 (see the STDBINUTILS description for details).
739 Say N unless you know what you are doing.
744 int "Thread shift" if EXPERT
746 default "15" if PPC_256K_PAGES
747 default "14" if PPC64
750 Used to define the stack size. The default is almost always what you
751 want. Only change this if you know what you are doing.
753 config FORCE_MAX_ZONEORDER
754 int "Maximum zone order"
755 range 8 9 if PPC64 && PPC_64K_PAGES
756 default "9" if PPC64 && PPC_64K_PAGES
757 range 13 13 if PPC64 && !PPC_64K_PAGES
758 default "13" if PPC64 && !PPC_64K_PAGES
759 range 9 64 if PPC32 && PPC_16K_PAGES
760 default "9" if PPC32 && PPC_16K_PAGES
761 range 7 64 if PPC32 && PPC_64K_PAGES
762 default "7" if PPC32 && PPC_64K_PAGES
763 range 5 64 if PPC32 && PPC_256K_PAGES
764 default "5" if PPC32 && PPC_256K_PAGES
768 The kernel memory allocator divides physically contiguous memory
769 blocks into "zones", where each zone is a power of two number of
770 pages. This option selects the largest power of two that the kernel
771 keeps in the memory allocator. If you need to allocate very large
772 blocks of physically contiguous memory, then you may need to
775 This config option is actually maximum order plus one. For example,
776 a value of 11 means that the largest free memory block is 2^10 pages.
778 The page size is not necessarily 4KB. For example, on 64-bit
779 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
780 this in mind when choosing a value for this option.
782 config PPC_SUBPAGE_PROT
783 bool "Support setting protections for 4k subpages"
784 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
786 This option adds support for a system call to allow user programs
787 to set access permissions (read/write, readonly, or no access)
788 on the 4k subpages of each 64k page.
790 config PPC_COPRO_BASE
795 bool "SMT (Hyperthreading) scheduler support"
796 depends on PPC64 && SMP
798 SMT scheduler support improves the CPU scheduler's decision making
799 when dealing with POWER5 cpus at a cost of slightly increased
800 overhead in some places. If unsure say N here.
802 config PPC_DENORMALISATION
803 bool "PowerPC denormalisation exception handling"
804 depends on PPC_BOOK3S_64
805 default "y" if PPC_POWERNV
807 Add support for handling denormalisation of single precision
808 values. Useful for bare metal only. If unsure say Y here.
811 bool "Default bootloader kernel arguments"
814 string "Initial kernel command string"
815 depends on CMDLINE_BOOL
816 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
818 On some platforms, there is currently no way for the boot loader to
819 pass arguments to the kernel. For these platforms, you can supply
820 some command-line options at build time by entering them here. In
821 most cases you will need to specify the root device here.
824 bool "Always use the default kernel command string"
825 depends on CMDLINE_BOOL
827 Always use the default kernel command string, even if the boot
828 loader passes other arguments to the kernel.
829 This is useful if you cannot or don't want to change the
830 command-line options your boot loader passes to the kernel.
833 string "Additional default image types"
835 List additional targets to be built by the bootwrapper here (separated
836 by spaces). This is useful for targets that depend of device tree
837 files in the .dts directory.
839 Targets in this list will be build as part of the default build
840 target, or when the user does a 'make zImage' or a
841 'make zImage.initrd'.
843 If unsure, leave blank
845 config ARCH_WANTS_FREEZER_CONTROL
849 source kernel/power/Kconfig
852 bool "Enable seccomp to safely compute untrusted bytecode"
856 This kernel feature is useful for number crunching applications
857 that may need to compute untrusted bytecode during their
858 execution. By using pipes or other transports made available to
859 the process as file descriptors supporting the read/write
860 syscalls, it's possible to isolate those applications in
861 their own address space using seccomp. Once seccomp is
862 enabled via /proc/<pid>/seccomp, it cannot be disabled
863 and the task is only allowed to execute a few safe syscalls
864 defined by each seccomp mode.
866 If unsure, say Y. Only embedded should say N here.
877 bool "Support for ISA-bus hardware"
881 Find out whether you have ISA slots on your motherboard. ISA is the
882 name of a bus system, i.e. the way the CPU talks to the other stuff
883 inside your box. If you have an Apple machine, say N here; if you
884 have an IBM RS/6000 or pSeries machine, say Y. If you have an
885 embedded board, consult your board documentation.
891 config NEED_DMA_MAP_STATE
892 def_bool (PPC64 || NOT_COHERENT_CACHE)
894 config NEED_SG_DMA_LENGTH
897 config GENERIC_ISA_DMA
899 depends on ISA_DMA_API
902 config PPC_INDIRECT_PCI
905 default y if 40x || 44x
919 select PPC_INDIRECT_PCI
925 depends on SUSPEND && (PPC_85xx || PPC_86xx)
927 Freescale MPC85xx/MPC86xx power management controller support
928 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
933 depends on SUSPEND && (44x || 40x)
935 PPC4xx Clock Power Management (CPM) support (suspend/resume).
936 It also enables support for two different idle states (idle-wait
943 bool "Freescale Local Bus support"
945 Enables reporting of errors from the Freescale local bus
946 controller. Also contains some common code used by
947 drivers for specific local bus peripherals.
951 depends on PPC_83xx || QUICC_ENGINE || CPM2
953 Freescale General-purpose Timers support
955 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
959 # Platforms that what PCI turned unconditionally just do select PCI
960 # in their config node. Platforms that want to choose at config
961 # time should select PPC_PCI_CHOICE
962 config PPC_PCI_CHOICE
966 bool "PCI support" if PPC_PCI_CHOICE
967 default y if !40x && !CPM2 && !PPC_8xx && !PPC_83xx \
968 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
969 default PCI_QSPAN if PPC_8xx
970 select GENERIC_PCI_IOMAP
972 Find out whether your system includes a PCI bus. PCI is the name of
973 a bus system, i.e. the way the CPU talks to the other stuff inside
974 your box. If you say Y here, the kernel will include drivers and
975 infrastructure code to support PCI bus devices.
988 Say Y here if you have a system based on a Motorola 8xx-series
989 embedded processor with a QSPAN PCI interface, otherwise say N.
993 depends on PCI && 8260
994 select PPC_INDIRECT_PCI
997 source "drivers/pci/Kconfig"
999 source "drivers/pcmcia/Kconfig"
1006 tristate "RapidIO support"
1007 depends on HAS_RAPIDIO || PCI
1009 If you say Y here, the kernel will include drivers and
1010 infrastructure code to support RapidIO interconnect devices.
1013 bool "Freescale Embedded SRIO Controller support"
1014 depends on RAPIDIO = y && HAS_RAPIDIO
1017 Include support for RapidIO controller on Freescale embedded
1018 processors (MPC8548, MPC8641, etc).
1020 source "drivers/rapidio/Kconfig"
1024 config NONSTATIC_KERNEL
1028 menu "Advanced setup"
1031 config ADVANCED_OPTIONS
1032 bool "Prompt for advanced kernel configuration options"
1034 This option will enable prompting for a variety of advanced kernel
1035 configuration options. These options can cause the kernel to not
1036 work if they are set incorrectly, but can be used to optimize certain
1037 aspects of kernel memory management.
1039 Unless you know what you are doing, say N here.
1041 comment "Default settings for advanced configuration options are used"
1042 depends on !ADVANCED_OPTIONS
1044 config LOWMEM_SIZE_BOOL
1045 bool "Set maximum low memory"
1046 depends on ADVANCED_OPTIONS
1048 This option allows you to set the maximum amount of memory which
1049 will be used as "low memory", that is, memory which the kernel can
1050 access directly, without having to set up a kernel virtual mapping.
1051 This can be useful in optimizing the layout of kernel virtual
1054 Say N here unless you know what you are doing.
1057 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1058 default "0x30000000"
1060 config LOWMEM_CAM_NUM_BOOL
1061 bool "Set number of CAMs to use to map low memory"
1062 depends on ADVANCED_OPTIONS && FSL_BOOKE
1064 This option allows you to set the maximum number of CAM slots that
1065 will be used to map low memory. There are a limited number of slots
1066 available and even more limited number that will fit in the L1 MMU.
1067 However, using more entries will allow mapping more low memory. This
1068 can be useful in optimizing the layout of kernel virtual memory.
1070 Say N here unless you know what you are doing.
1072 config LOWMEM_CAM_NUM
1073 depends on FSL_BOOKE
1074 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1077 config DYNAMIC_MEMSTART
1078 bool "Enable page aligned dynamic load address for kernel"
1079 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1080 select NONSTATIC_KERNEL
1082 This option enables the kernel to be loaded at any page aligned
1083 physical address. The kernel creates a mapping from KERNELBASE to
1084 the address where the kernel is loaded. The page size here implies
1085 the TLB page size of the mapping for kernel on the particular platform.
1086 Please refer to the init code for finding the TLB page size.
1088 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1089 kernel image, where the only restriction is the page aligned kernel
1090 load address. When this option is enabled, the compile time physical
1091 address CONFIG_PHYSICAL_START is ignored.
1093 This option is overridden by CONFIG_RELOCATABLE
1095 config PAGE_OFFSET_BOOL
1096 bool "Set custom page offset address"
1097 depends on ADVANCED_OPTIONS
1099 This option allows you to set the kernel virtual address at which
1100 the kernel will map low memory. This can be useful in optimizing
1101 the virtual memory layout of the system.
1103 Say N here unless you know what you are doing.
1106 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1107 default "0xc0000000"
1109 config KERNEL_START_BOOL
1110 bool "Set custom kernel base address"
1111 depends on ADVANCED_OPTIONS
1113 This option allows you to set the kernel virtual address at which
1114 the kernel will be loaded. Normally this should match PAGE_OFFSET
1115 however there are times (like kdump) that one might not want them
1118 Say N here unless you know what you are doing.
1121 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1122 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1123 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1124 default "0xc0000000"
1126 config PHYSICAL_START_BOOL
1127 bool "Set physical address where the kernel is loaded"
1128 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1130 This gives the physical address where the kernel is loaded.
1132 Say N here unless you know what you are doing.
1134 config PHYSICAL_START
1135 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1136 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1137 default "0x00000000"
1139 config PHYSICAL_ALIGN
1141 default "0x04000000" if FSL_BOOKE
1143 This value puts the alignment restrictions on physical address
1144 where kernel is loaded and run from. Kernel is compiled for an
1145 address which meets above alignment restriction.
1147 config TASK_SIZE_BOOL
1148 bool "Set custom user task size"
1149 depends on ADVANCED_OPTIONS
1151 This option allows you to set the amount of virtual address space
1152 allocated to user tasks. This can be useful in optimizing the
1153 virtual memory layout of the system.
1155 Say N here unless you know what you are doing.
1158 hex "Size of user task space" if TASK_SIZE_BOOL
1159 default "0x80000000" if PPC_8xx
1160 default "0xc0000000"
1162 config CONSISTENT_SIZE_BOOL
1163 bool "Set custom consistent memory pool size"
1164 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1166 This option allows you to set the size of the
1167 consistent memory pool. This pool of virtual memory
1168 is used to make consistent memory allocations.
1170 config CONSISTENT_SIZE
1171 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1172 default "0x00200000" if NOT_COHERENT_CACHE
1175 bool "Pinned Kernel TLBs (860 ONLY)"
1176 depends on ADVANCED_OPTIONS && PPC_8xx && \
1177 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1180 bool "Pinned TLB for DATA"
1185 bool "Pinned TLB for IMMR"
1190 bool "Pinned TLB for TEXT"
1196 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1199 default "0xc000000000000000"
1202 default "0xc000000000000000"
1203 config PHYSICAL_START
1205 default "0x00000000"
1211 source "net/Kconfig"
1213 source "drivers/Kconfig"
1217 source "lib/Kconfig"
1219 source "arch/powerpc/Kconfig.debug"
1221 source "security/Kconfig"
1223 source "crypto/Kconfig"
1225 config PPC_LIB_RHEAP
1228 source "arch/powerpc/kvm/Kconfig"
1230 source "kernel/livepatch/Kconfig"