1 # SPDX-License-Identifier: GPL-2.0
2 source "arch/powerpc/platforms/Kconfig.cputype"
20 config ARCH_MMAP_RND_BITS_MAX
21 # On Book3S 64, the default virtual address space for 64-bit processes
22 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
23 # 32T of address space (2^45), which should ensure a reasonable gap
24 # between bottom-up and top-down allocations for applications that
25 # consume "normal" amounts of address space. Book3S 64 only supports 64K
27 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
28 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K)
30 # On all other 64-bit platforms (currently only Book3E), the virtual
31 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
32 # of address space (2^44). Only 4K page sizes are supported.
33 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K)
35 # For 32-bit, use the compat values, as they're the same.
36 default ARCH_MMAP_RND_COMPAT_BITS_MAX
38 config ARCH_MMAP_RND_BITS_MIN
39 # Allow randomisation to consume up to 1GB of address space (2^30).
40 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K)
41 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K)
43 # For 32-bit, use the compat values, as they're the same.
44 default ARCH_MMAP_RND_COMPAT_BITS_MIN
46 config ARCH_MMAP_RND_COMPAT_BITS_MAX
47 # Total virtual address space for 32-bit processes is 2^31 (2GB).
48 # Allow randomisation to consume up to 512MB of address space (2^29).
49 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K)
50 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K)
51 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K)
52 default 17 # 17 = 29 (512MB) - 12 (4K)
54 config ARCH_MMAP_RND_COMPAT_BITS_MIN
55 # Total virtual address space for 32-bit processes is 2^31 (2GB).
56 # Allow randomisation to consume up to 8MB of address space (2^23).
57 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K)
58 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K)
59 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K)
60 default 11 # 11 = 23 (8MB) - 12 (4K)
62 config HAVE_SETUP_PER_CPU_AREA
65 config NEED_PER_CPU_EMBED_FIRST_CHUNK
69 int "Number of virtual interrupt numbers"
73 This defines the number of virtual interrupt numbers the kernel
74 can manage. Virtual interrupt numbers are what you see in
75 /proc/interrupts. If you configure your system to have too few,
76 drivers will fail to load or worse - handle with care.
80 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
85 depends on HARDLOCKUP_DETECTOR
86 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
89 This is a placeholder when the powerpc hardlockup detector
90 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
91 seleted via the generic lockup detector menu which is why we
92 have no standalone config option for it here.
94 config STACKTRACE_SUPPORT
98 config TRACE_IRQFLAGS_SUPPORT
102 config LOCKDEP_SUPPORT
106 config RWSEM_GENERIC_SPINLOCK
109 config RWSEM_XCHGADD_ALGORITHM
113 config GENERIC_LOCKBREAK
116 depends on SMP && PREEMPT
118 config GENERIC_HWEIGHT
122 config ARCH_HAS_DMA_SET_COHERENT_MASK
129 # Please keep this list sorted alphabetically.
131 select ARCH_HAS_DEVMEM_IS_ALLOWED
132 select ARCH_HAS_DMA_SET_COHERENT_MASK
133 select ARCH_HAS_ELF_RANDOMIZE
134 select ARCH_HAS_FORTIFY_SOURCE
135 select ARCH_HAS_GCOV_PROFILE_ALL
136 select ARCH_HAS_PHYS_TO_DMA
137 select ARCH_HAS_PMEM_API if PPC64
138 select ARCH_HAS_PTE_SPECIAL
139 select ARCH_HAS_MEMBARRIER_CALLBACKS
140 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE
141 select ARCH_HAS_SG_CHAIN
142 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION)
143 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
144 select ARCH_HAS_UACCESS_FLUSHCACHE if PPC64
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_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
151 select ARCH_SUPPORTS_ATOMIC_RMW
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 DYNAMIC_FTRACE if FUNCTION_TRACER
161 select EDAC_ATOMIC_SCRUB
163 select GENERIC_ATOMIC64 if PPC32
164 select GENERIC_CLOCKEVENTS
165 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
166 select GENERIC_CMOS_UPDATE
167 select GENERIC_CPU_AUTOPROBE
168 select GENERIC_CPU_VULNERABILITIES if PPC_BOOK3S_64
169 select GENERIC_IRQ_SHOW
170 select GENERIC_IRQ_SHOW_LEVEL
171 select GENERIC_SMP_IDLE_THREAD
172 select GENERIC_STRNCPY_FROM_USER
173 select GENERIC_STRNLEN_USER
174 select GENERIC_TIME_VSYSCALL
175 select HAVE_ARCH_AUDITSYSCALL
176 select HAVE_ARCH_JUMP_LABEL
177 select HAVE_ARCH_KGDB
178 select HAVE_ARCH_MMAP_RND_BITS
179 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
180 select HAVE_ARCH_SECCOMP_FILTER
181 select HAVE_ARCH_TRACEHOOK
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_DYNAMIC_FTRACE
187 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
188 select HAVE_EBPF_JIT if PPC64
189 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
190 select HAVE_FTRACE_MCOUNT_RECORD
191 select HAVE_FUNCTION_GRAPH_TRACER
192 select HAVE_FUNCTION_TRACER
193 select HAVE_GCC_PLUGINS
194 select HAVE_GENERIC_GUP
195 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
197 select HAVE_IOREMAP_PROT
198 select HAVE_IRQ_EXIT_ON_IRQ_STACK
199 select HAVE_KERNEL_GZIP
201 select HAVE_KPROBES_ON_FTRACE
202 select HAVE_KRETPROBES
203 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
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_RELIABLE_STACKTRACE if PPC64 && CPU_LITTLE_ENDIAN
220 select HAVE_SYSCALL_TRACEPOINTS
221 select HAVE_VIRT_CPU_ACCOUNTING
222 select HAVE_IRQ_TIME_ACCOUNTING
223 select IOMMU_HELPER if PPC64
225 select IRQ_FORCED_THREADING
226 select MODULES_USE_ELF_RELA
227 select NEED_SG_DMA_LENGTH
230 select OF_EARLY_FLATTREE
231 select OF_RESERVED_MEM
232 select OLD_SIGACTION if PPC32
233 select OLD_SIGSUSPEND
236 select SYSCTL_EXCEPTION_TRACE
237 select VIRT_TO_BUS if !PPC64
239 # Please keep this list sorted alphabetically.
256 select COMPAT_BINFMT_ELF
257 select ARCH_WANT_OLD_COMPAT_IPC
258 select COMPAT_OLD_SIGACTION
260 config SYSVIPC_COMPAT
262 depends on COMPAT && SYSVIPC
265 # All PPC32s use generic nvram driver through ppc_md
270 config SCHED_OMIT_FRAME_POINTER
274 config ARCH_MAY_HAVE_PC_FDC
278 config PPC_UDBG_16550
282 config GENERIC_TBSYNC
284 default y if PPC32 && SMP
296 config SYS_SUPPORTS_APM_EMULATION
297 default y if PMAC_APM_EMU
303 Used to allow a board to specify it wants an ePAPR compliant wrapper.
306 config DEFAULT_UIMAGE
309 Used to allow a board to specify it wants a uImage built by default
312 config ARCH_HIBERNATION_POSSIBLE
316 config ARCH_SUSPEND_POSSIBLE
318 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
319 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
322 config PPC_DCR_NATIVE
332 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
335 config PPC_OF_PLATFORM_PCI
338 depends on PPC64 # not supported on 32 bits yet
341 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
342 depends on PPC32 || PPC_BOOK3S_64
345 config ARCH_SUPPORTS_UPROBES
348 config PPC_ADV_DEBUG_REGS
350 depends on 40x || BOOKE
353 config PPC_ADV_DEBUG_IACS
355 depends on PPC_ADV_DEBUG_REGS
359 config PPC_ADV_DEBUG_DACS
361 depends on PPC_ADV_DEBUG_REGS
364 config PPC_ADV_DEBUG_DVCS
366 depends on PPC_ADV_DEBUG_REGS
370 config PPC_ADV_DEBUG_DAC_RANGE
372 depends on PPC_ADV_DEBUG_REGS && 44x
379 config PGTABLE_LEVELS
382 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
385 source "init/Kconfig"
387 source "kernel/Kconfig.freezer"
389 source "arch/powerpc/sysdev/Kconfig"
390 source "arch/powerpc/platforms/Kconfig"
392 menu "Kernel options"
395 bool "High memory support"
398 source kernel/Kconfig.hz
399 source kernel/Kconfig.preempt
400 source "fs/Kconfig.binfmt"
402 config HUGETLB_PAGE_SIZE_VARIABLE
404 depends on HUGETLB_PAGE
407 config MATH_EMULATION
408 bool "Math emulation"
409 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
411 Some PowerPC chips designed for embedded applications do not have
412 a floating-point unit and therefore do not implement the
413 floating-point instructions in the PowerPC instruction set. If you
414 say Y here, the kernel will include code to emulate a floating-point
415 unit, which will allow programs that use floating-point
418 This is also useful to emulate missing (optional) instructions
419 such as fsqrt on cores that do have an FPU but do not implement
420 them (such as Freescale BookE).
423 prompt "Math emulation options"
424 default MATH_EMULATION_FULL
425 depends on MATH_EMULATION
427 config MATH_EMULATION_FULL
428 bool "Emulate all the floating point instructions"
430 Select this option will enable the kernel to support to emulate
431 all the floating point instructions. If your SoC doesn't have
432 a FPU, you should select this.
434 config MATH_EMULATION_HW_UNIMPLEMENTED
435 bool "Just emulate the FPU unimplemented instructions"
437 Select this if you know there does have a hardware FPU on your
438 SoC, but some floating point instructions are not implemented by that.
442 config PPC_TRANSACTIONAL_MEM
443 bool "Transactional Memory support for POWERPC"
444 depends on PPC_BOOK3S_64
450 Support user-mode Transactional Memory on POWERPC.
452 config LD_HEAD_STUB_CATCH
453 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
457 Very large kernels can cause linker branch stubs to be generated by
458 code in head_64.S, which moves the head text sections out of their
459 specified location. This option can work around the problem.
463 config DISABLE_MPROFILE_KERNEL
464 bool "Disable use of mprofile-kernel for kernel tracing"
465 depends on PPC64 && CPU_LITTLE_ENDIAN
468 Selecting this options disables use of the mprofile-kernel ABI for
469 kernel tracing. That will cause options such as live patching
470 (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
473 If you have a toolchain which supports mprofile-kernel, then you can
474 disable this. Otherwise leave it enabled. If you're not sure, say
477 config MPROFILE_KERNEL
478 depends on PPC64 && CPU_LITTLE_ENDIAN
479 def_bool !DISABLE_MPROFILE_KERNEL
482 bool "Support for enabling/disabling CPUs"
483 depends on SMP && (PPC_PSERIES || \
484 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
486 Say Y here to be able to disable and re-enable individual
487 CPUs at runtime on SMP machines.
489 Say N if you are unsure.
491 config ARCH_CPU_PROBE_RELEASE
493 depends on HOTPLUG_CPU
495 config ARCH_ENABLE_MEMORY_HOTPLUG
498 config ARCH_HAS_WALK_MEMORY
501 config ARCH_ENABLE_MEMORY_HOTREMOVE
504 config PPC64_SUPPORTS_MEMORY_FAILURE
505 bool "Add support for memory hwpoison"
506 depends on PPC_BOOK3S_64
507 default "y" if PPC_POWERNV
508 select ARCH_SUPPORTS_MEMORY_FAILURE
511 bool "kexec system call"
512 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
515 kexec is a system call that implements the ability to shutdown your
516 current kernel, and to start another kernel. It is like a reboot
517 but it is independent of the system firmware. And like a reboot
518 you can start any kernel with it, not just Linux.
520 The name comes from the similarity to the exec system call.
522 It is an ongoing process to be certain the hardware in a machine
523 is properly shutdown, so do not be surprised if this code does not
524 initially work for you. As of this writing the exact hardware
525 interface is strongly in flux, so no good recommendation can be
529 bool "kexec file based system call"
531 select HAVE_IMA_KEXEC
535 depends on CRYPTO_SHA256=y
537 This is a new version of the kexec system call. This call is
538 file based and takes in file descriptors as system call arguments
539 for kernel and initramfs as opposed to a list of segments as is the
540 case for the older kexec call.
542 config ARCH_HAS_KEXEC_PURGATORY
546 bool "Build a relocatable kernel"
547 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
548 select NONSTATIC_KERNEL
549 select MODULE_REL_CRCS if MODVERSIONS
551 This builds a kernel image that is capable of running at the
552 location the kernel is loaded at. For ppc32, there is no any
553 alignment restrictions, and this feature is a superset of
554 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
555 16k-aligned base address. The kernel is linked as a
556 position-independent executable (PIE) and contains dynamic relocations
557 which are processed early in the bootup process.
559 One use is for the kexec on panic case where the recovery kernel
560 must live at a different physical address than the primary
563 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
564 it has been loaded at and the compile time physical addresses
565 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
566 setting can still be useful to bootwrappers that need to know the
567 load address of the kernel (eg. u-boot/mkimage).
569 config RELOCATABLE_TEST
570 bool "Test relocatable kernel"
571 depends on (PPC64 && RELOCATABLE)
574 This runs the relocatable kernel at the address it was initially
575 loaded at, which tends to be non-zero and therefore test the
579 bool "Build a dump capture kernel"
580 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
581 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
583 Build a kernel suitable for use as a dump capture kernel.
584 The same kernel binary can be used as production kernel and dump
588 bool "Firmware-assisted dump"
589 depends on PPC64 && PPC_RTAS
593 A robust mechanism to get reliable kernel crash dump with
594 assistance from firmware. This approach does not use kexec,
595 instead firmware assists in booting the capture kernel
596 while preserving memory contents. Firmware-assisted dump
597 is meant to be a kdump replacement offering robustness and
598 speed not possible without system firmware assistance.
603 bool "Distribute interrupts on all CPUs by default"
606 This option gives the kernel permission to distribute IRQs across
607 multiple CPUs. Saying N here will route all IRQs to the first
608 CPU. Generally saying Y is safe, although some problems have been
609 reported with SMP Power Macintoshes with this option enabled.
614 default y if SMP && PPC_PSERIES
620 depends on NEED_MULTIPLE_NODES
622 config USE_PERCPU_NUMA_NODE_ID
626 config HAVE_MEMORYLESS_NODES
630 config ARCH_SELECT_MEMORY_MODEL
634 config ARCH_FLATMEM_ENABLE
636 depends on (PPC64 && !NUMA) || PPC32
638 config ARCH_SPARSEMEM_ENABLE
641 select SPARSEMEM_VMEMMAP_ENABLE
643 config ARCH_SPARSEMEM_DEFAULT
645 depends on PPC_BOOK3S_64
647 config SYS_SUPPORTS_HUGETLBFS
650 config ILLEGAL_POINTER_VALUE
652 # This is roughly half way between the top of user space and the bottom
653 # of kernel space, which seems about as good as we can get.
654 default 0x5deadbeef0000000 if PPC64
659 config ARCH_MEMORY_PROBE
661 depends on MEMORY_HOTPLUG
663 # Some NUMA nodes have memory ranges that span
664 # other nodes. Even though a pfn is valid and
665 # between a node's start and end pfns, it may not
666 # reside on that node. See memmap_init_zone()
668 config NODES_SPAN_OTHER_NODES
670 depends on NEED_MULTIPLE_NODES
673 bool "Using standard binutils settings"
677 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
678 Note, that kernel will be able to run only those applications,
679 which had been compiled using binutils later than 2.17.50.0.3 with
680 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
681 the older binutils, you can patch them with a trivial patch, which
682 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
688 Select the kernel logical page size. Increasing the page size
689 will reduce software overhead at each page boundary, allow
690 hardware prefetch mechanisms to be more effective, and allow
691 larger dma transfers increasing IO efficiency and reducing
692 overhead. However the utilization of memory will increase.
693 For example, each cached file will using a multiple of the
694 page size to hold its contents and the difference between the
695 end of file and the end of page is wasted.
697 Some dedicated systems, such as software raid serving with
698 accelerated calculations, have shown significant increases.
700 If you configure a 64 bit kernel for 64k pages but the
701 processor does not support them, then the kernel will simulate
702 them with 4k pages, loading them on demand, but with the
703 reduced software overhead and larger internal fragmentation.
704 For the 32 bit kernel, a large page option will not be offered
705 unless it is supported by the configured processor.
707 If unsure, choose 4K_PAGES.
711 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
715 depends on 44x || PPC_8xx
719 depends on !PPC_FSL_BOOK3E && (44x || PPC_BOOK3S_64 || PPC_BOOK3E_64)
720 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
722 config PPC_256K_PAGES
723 bool "256k page size"
724 depends on 44x && !STDBINUTILS
726 Make the page size 256k.
728 As the ELF standard only requires alignment to support page
729 sizes up to 64k, you will need to compile all of your user
730 space applications with a non-standard binutils settings
731 (see the STDBINUTILS description for details).
733 Say N unless you know what you are doing.
738 int "Thread shift" if EXPERT
740 default "15" if PPC_256K_PAGES
741 default "14" if PPC64
744 Used to define the stack size. The default is almost always what you
745 want. Only change this if you know what you are doing.
747 config FORCE_MAX_ZONEORDER
748 int "Maximum zone order"
749 range 8 9 if PPC64 && PPC_64K_PAGES
750 default "9" if PPC64 && PPC_64K_PAGES
751 range 13 13 if PPC64 && !PPC_64K_PAGES
752 default "13" if PPC64 && !PPC_64K_PAGES
753 range 9 64 if PPC32 && PPC_16K_PAGES
754 default "9" if PPC32 && PPC_16K_PAGES
755 range 7 64 if PPC32 && PPC_64K_PAGES
756 default "7" if PPC32 && PPC_64K_PAGES
757 range 5 64 if PPC32 && PPC_256K_PAGES
758 default "5" if PPC32 && PPC_256K_PAGES
762 The kernel memory allocator divides physically contiguous memory
763 blocks into "zones", where each zone is a power of two number of
764 pages. This option selects the largest power of two that the kernel
765 keeps in the memory allocator. If you need to allocate very large
766 blocks of physically contiguous memory, then you may need to
769 This config option is actually maximum order plus one. For example,
770 a value of 11 means that the largest free memory block is 2^10 pages.
772 The page size is not necessarily 4KB. For example, on 64-bit
773 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
774 this in mind when choosing a value for this option.
776 config PPC_SUBPAGE_PROT
777 bool "Support setting protections for 4k subpages"
778 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
780 This option adds support for a system call to allow user programs
781 to set access permissions (read/write, readonly, or no access)
782 on the 4k subpages of each 64k page.
784 config PPC_COPRO_BASE
789 bool "SMT (Hyperthreading) scheduler support"
790 depends on PPC64 && SMP
792 SMT scheduler support improves the CPU scheduler's decision making
793 when dealing with POWER5 cpus at a cost of slightly increased
794 overhead in some places. If unsure say N here.
796 config PPC_DENORMALISATION
797 bool "PowerPC denormalisation exception handling"
798 depends on PPC_BOOK3S_64
799 default "y" if PPC_POWERNV
801 Add support for handling denormalisation of single precision
802 values. Useful for bare metal only. If unsure say Y here.
805 bool "Default bootloader kernel arguments"
808 string "Initial kernel command string"
809 depends on CMDLINE_BOOL
810 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
812 On some platforms, there is currently no way for the boot loader to
813 pass arguments to the kernel. For these platforms, you can supply
814 some command-line options at build time by entering them here. In
815 most cases you will need to specify the root device here.
818 bool "Always use the default kernel command string"
819 depends on CMDLINE_BOOL
821 Always use the default kernel command string, even if the boot
822 loader passes other arguments to the kernel.
823 This is useful if you cannot or don't want to change the
824 command-line options your boot loader passes to the kernel.
827 string "Additional default image types"
829 List additional targets to be built by the bootwrapper here (separated
830 by spaces). This is useful for targets that depend of device tree
831 files in the .dts directory.
833 Targets in this list will be build as part of the default build
834 target, or when the user does a 'make zImage' or a
835 'make zImage.initrd'.
837 If unsure, leave blank
839 config ARCH_WANTS_FREEZER_CONTROL
843 source kernel/power/Kconfig
846 bool "Enable seccomp to safely compute untrusted bytecode"
850 This kernel feature is useful for number crunching applications
851 that may need to compute untrusted bytecode during their
852 execution. By using pipes or other transports made available to
853 the process as file descriptors supporting the read/write
854 syscalls, it's possible to isolate those applications in
855 their own address space using seccomp. Once seccomp is
856 enabled via /proc/<pid>/seccomp, it cannot be disabled
857 and the task is only allowed to execute a few safe syscalls
858 defined by each seccomp mode.
860 If unsure, say Y. Only embedded should say N here.
863 prompt "PowerPC Memory Protection Keys"
865 depends on PPC_BOOK3S_64
866 select ARCH_USES_HIGH_VMA_FLAGS
867 select ARCH_HAS_PKEYS
869 Memory Protection Keys provides a mechanism for enforcing
870 page-based protections, but without requiring modification of the
871 page tables when an application changes protection domains.
873 For details, see Documentation/vm/protection-keys.rst
886 bool "Support for ISA-bus hardware"
890 Find out whether you have ISA slots on your motherboard. ISA is the
891 name of a bus system, i.e. the way the CPU talks to the other stuff
892 inside your box. If you have an Apple machine, say N here; if you
893 have an IBM RS/6000 or pSeries machine, say Y. If you have an
894 embedded board, consult your board documentation.
900 config NEED_DMA_MAP_STATE
901 def_bool (PPC64 || NOT_COHERENT_CACHE)
903 config GENERIC_ISA_DMA
905 depends on ISA_DMA_API
908 config PPC_INDIRECT_PCI
911 default y if 40x || 44x
925 select PPC_INDIRECT_PCI
931 depends on SUSPEND && (PPC_85xx || PPC_86xx)
933 Freescale MPC85xx/MPC86xx power management controller support
934 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
939 depends on SUSPEND && (44x || 40x)
941 PPC4xx Clock Power Management (CPM) support (suspend/resume).
942 It also enables support for two different idle states (idle-wait
949 bool "Freescale Local Bus support"
951 Enables reporting of errors from the Freescale local bus
952 controller. Also contains some common code used by
953 drivers for specific local bus peripherals.
957 depends on PPC_83xx || QUICC_ENGINE || CPM2
959 Freescale General-purpose Timers support
961 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
965 # Platforms that what PCI turned unconditionally just do select PCI
966 # in their config node. Platforms that want to choose at config
967 # time should select PPC_PCI_CHOICE
968 config PPC_PCI_CHOICE
972 bool "PCI support" if PPC_PCI_CHOICE
973 default y if !40x && !CPM2 && !PPC_8xx && !PPC_83xx \
974 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
975 default PCI_QSPAN if PPC_8xx
976 select GENERIC_PCI_IOMAP
978 Find out whether your system includes a PCI bus. PCI is the name of
979 a bus system, i.e. the way the CPU talks to the other stuff inside
980 your box. If you say Y here, the kernel will include drivers and
981 infrastructure code to support PCI bus devices.
994 Say Y here if you have a system based on a Motorola 8xx-series
995 embedded processor with a QSPAN PCI interface, otherwise say N.
999 depends on PCI && 8260
1000 select PPC_INDIRECT_PCI
1003 source "drivers/pci/Kconfig"
1005 source "drivers/pcmcia/Kconfig"
1012 tristate "RapidIO support"
1013 depends on HAS_RAPIDIO || PCI
1015 If you say Y here, the kernel will include drivers and
1016 infrastructure code to support RapidIO interconnect devices.
1019 bool "Freescale Embedded SRIO Controller support"
1020 depends on RAPIDIO = y && HAS_RAPIDIO
1023 Include support for RapidIO controller on Freescale embedded
1024 processors (MPC8548, MPC8641, etc).
1026 source "drivers/rapidio/Kconfig"
1030 config NONSTATIC_KERNEL
1034 menu "Advanced setup"
1037 config ADVANCED_OPTIONS
1038 bool "Prompt for advanced kernel configuration options"
1040 This option will enable prompting for a variety of advanced kernel
1041 configuration options. These options can cause the kernel to not
1042 work if they are set incorrectly, but can be used to optimize certain
1043 aspects of kernel memory management.
1045 Unless you know what you are doing, say N here.
1047 comment "Default settings for advanced configuration options are used"
1048 depends on !ADVANCED_OPTIONS
1050 config LOWMEM_SIZE_BOOL
1051 bool "Set maximum low memory"
1052 depends on ADVANCED_OPTIONS
1054 This option allows you to set the maximum amount of memory which
1055 will be used as "low memory", that is, memory which the kernel can
1056 access directly, without having to set up a kernel virtual mapping.
1057 This can be useful in optimizing the layout of kernel virtual
1060 Say N here unless you know what you are doing.
1063 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1064 default "0x30000000"
1066 config LOWMEM_CAM_NUM_BOOL
1067 bool "Set number of CAMs to use to map low memory"
1068 depends on ADVANCED_OPTIONS && FSL_BOOKE
1070 This option allows you to set the maximum number of CAM slots that
1071 will be used to map low memory. There are a limited number of slots
1072 available and even more limited number that will fit in the L1 MMU.
1073 However, using more entries will allow mapping more low memory. This
1074 can be useful in optimizing the layout of kernel virtual memory.
1076 Say N here unless you know what you are doing.
1078 config LOWMEM_CAM_NUM
1079 depends on FSL_BOOKE
1080 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1083 config DYNAMIC_MEMSTART
1084 bool "Enable page aligned dynamic load address for kernel"
1085 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1086 select NONSTATIC_KERNEL
1088 This option enables the kernel to be loaded at any page aligned
1089 physical address. The kernel creates a mapping from KERNELBASE to
1090 the address where the kernel is loaded. The page size here implies
1091 the TLB page size of the mapping for kernel on the particular platform.
1092 Please refer to the init code for finding the TLB page size.
1094 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1095 kernel image, where the only restriction is the page aligned kernel
1096 load address. When this option is enabled, the compile time physical
1097 address CONFIG_PHYSICAL_START is ignored.
1099 This option is overridden by CONFIG_RELOCATABLE
1101 config PAGE_OFFSET_BOOL
1102 bool "Set custom page offset address"
1103 depends on ADVANCED_OPTIONS
1105 This option allows you to set the kernel virtual address at which
1106 the kernel will map low memory. This can be useful in optimizing
1107 the virtual memory layout of the system.
1109 Say N here unless you know what you are doing.
1112 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1113 default "0xc0000000"
1115 config KERNEL_START_BOOL
1116 bool "Set custom kernel base address"
1117 depends on ADVANCED_OPTIONS
1119 This option allows you to set the kernel virtual address at which
1120 the kernel will be loaded. Normally this should match PAGE_OFFSET
1121 however there are times (like kdump) that one might not want them
1124 Say N here unless you know what you are doing.
1127 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1128 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1129 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1130 default "0xc0000000"
1132 config PHYSICAL_START_BOOL
1133 bool "Set physical address where the kernel is loaded"
1134 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1136 This gives the physical address where the kernel is loaded.
1138 Say N here unless you know what you are doing.
1140 config PHYSICAL_START
1141 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1142 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1143 default "0x00000000"
1145 config PHYSICAL_ALIGN
1147 default "0x04000000" if FSL_BOOKE
1149 This value puts the alignment restrictions on physical address
1150 where kernel is loaded and run from. Kernel is compiled for an
1151 address which meets above alignment restriction.
1153 config TASK_SIZE_BOOL
1154 bool "Set custom user task size"
1155 depends on ADVANCED_OPTIONS
1157 This option allows you to set the amount of virtual address space
1158 allocated to user tasks. This can be useful in optimizing the
1159 virtual memory layout of the system.
1161 Say N here unless you know what you are doing.
1164 hex "Size of user task space" if TASK_SIZE_BOOL
1165 default "0x80000000" if PPC_8xx
1166 default "0xc0000000"
1168 config CONSISTENT_SIZE_BOOL
1169 bool "Set custom consistent memory pool size"
1170 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1172 This option allows you to set the size of the
1173 consistent memory pool. This pool of virtual memory
1174 is used to make consistent memory allocations.
1176 config CONSISTENT_SIZE
1177 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1178 default "0x00200000" if NOT_COHERENT_CACHE
1181 bool "Pinned Kernel TLBs (860 ONLY)"
1182 depends on ADVANCED_OPTIONS && PPC_8xx && \
1183 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1186 bool "Pinned TLB for DATA"
1191 bool "Pinned TLB for IMMR"
1196 bool "Pinned TLB for TEXT"
1202 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1205 default "0xc000000000000000"
1208 default "0xc000000000000000"
1209 config PHYSICAL_START
1211 default "0x00000000"
1217 source "net/Kconfig"
1219 source "drivers/Kconfig"
1223 source "lib/Kconfig"
1225 source "arch/powerpc/Kconfig.debug"
1227 source "security/Kconfig"
1229 source "crypto/Kconfig"
1231 config PPC_LIB_RHEAP
1234 source "arch/powerpc/kvm/Kconfig"
1236 source "kernel/livepatch/Kconfig"