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
224 select IOMMU_HELPER if PPC64
226 select IRQ_FORCED_THREADING
227 select MODULES_USE_ELF_RELA
228 select NEED_SG_DMA_LENGTH
231 select OF_EARLY_FLATTREE
232 select OF_RESERVED_MEM
233 select OLD_SIGACTION if PPC32
234 select OLD_SIGSUSPEND
237 select SYSCTL_EXCEPTION_TRACE
238 select VIRT_TO_BUS if !PPC64
240 # Please keep this list sorted alphabetically.
257 select COMPAT_BINFMT_ELF
258 select ARCH_WANT_OLD_COMPAT_IPC
259 select COMPAT_OLD_SIGACTION
261 config SYSVIPC_COMPAT
263 depends on COMPAT && SYSVIPC
266 # All PPC32s use generic nvram driver through ppc_md
271 config SCHED_OMIT_FRAME_POINTER
275 config ARCH_MAY_HAVE_PC_FDC
279 config PPC_UDBG_16550
283 config GENERIC_TBSYNC
285 default y if PPC32 && SMP
297 config SYS_SUPPORTS_APM_EMULATION
298 default y if PMAC_APM_EMU
304 Used to allow a board to specify it wants an ePAPR compliant wrapper.
307 config DEFAULT_UIMAGE
310 Used to allow a board to specify it wants a uImage built by default
313 config ARCH_HIBERNATION_POSSIBLE
317 config ARCH_SUSPEND_POSSIBLE
319 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
320 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
323 config PPC_DCR_NATIVE
333 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
336 config PPC_OF_PLATFORM_PCI
339 depends on PPC64 # not supported on 32 bits yet
342 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
343 depends on PPC32 || PPC_BOOK3S_64
346 config ARCH_SUPPORTS_UPROBES
349 config PPC_ADV_DEBUG_REGS
351 depends on 40x || BOOKE
354 config PPC_ADV_DEBUG_IACS
356 depends on PPC_ADV_DEBUG_REGS
360 config PPC_ADV_DEBUG_DACS
362 depends on PPC_ADV_DEBUG_REGS
365 config PPC_ADV_DEBUG_DVCS
367 depends on PPC_ADV_DEBUG_REGS
371 config PPC_ADV_DEBUG_DAC_RANGE
373 depends on PPC_ADV_DEBUG_REGS && 44x
380 config PGTABLE_LEVELS
383 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
386 source "init/Kconfig"
388 source "kernel/Kconfig.freezer"
390 source "arch/powerpc/sysdev/Kconfig"
391 source "arch/powerpc/platforms/Kconfig"
393 menu "Kernel options"
396 bool "High memory support"
399 source kernel/Kconfig.hz
400 source kernel/Kconfig.preempt
401 source "fs/Kconfig.binfmt"
403 config HUGETLB_PAGE_SIZE_VARIABLE
405 depends on HUGETLB_PAGE
408 config MATH_EMULATION
409 bool "Math emulation"
410 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
412 Some PowerPC chips designed for embedded applications do not have
413 a floating-point unit and therefore do not implement the
414 floating-point instructions in the PowerPC instruction set. If you
415 say Y here, the kernel will include code to emulate a floating-point
416 unit, which will allow programs that use floating-point
419 This is also useful to emulate missing (optional) instructions
420 such as fsqrt on cores that do have an FPU but do not implement
421 them (such as Freescale BookE).
424 prompt "Math emulation options"
425 default MATH_EMULATION_FULL
426 depends on MATH_EMULATION
428 config MATH_EMULATION_FULL
429 bool "Emulate all the floating point instructions"
431 Select this option will enable the kernel to support to emulate
432 all the floating point instructions. If your SoC doesn't have
433 a FPU, you should select this.
435 config MATH_EMULATION_HW_UNIMPLEMENTED
436 bool "Just emulate the FPU unimplemented instructions"
438 Select this if you know there does have a hardware FPU on your
439 SoC, but some floating point instructions are not implemented by that.
443 config PPC_TRANSACTIONAL_MEM
444 bool "Transactional Memory support for POWERPC"
445 depends on PPC_BOOK3S_64
451 Support user-mode Transactional Memory on POWERPC.
453 config LD_HEAD_STUB_CATCH
454 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
458 Very large kernels can cause linker branch stubs to be generated by
459 code in head_64.S, which moves the head text sections out of their
460 specified location. This option can work around the problem.
464 config DISABLE_MPROFILE_KERNEL
465 bool "Disable use of mprofile-kernel for kernel tracing"
466 depends on PPC64 && CPU_LITTLE_ENDIAN
469 Selecting this options disables use of the mprofile-kernel ABI for
470 kernel tracing. That will cause options such as live patching
471 (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
474 If you have a toolchain which supports mprofile-kernel, then you can
475 disable this. Otherwise leave it enabled. If you're not sure, say
478 config MPROFILE_KERNEL
479 depends on PPC64 && CPU_LITTLE_ENDIAN
480 def_bool !DISABLE_MPROFILE_KERNEL
483 bool "Support for enabling/disabling CPUs"
484 depends on SMP && (PPC_PSERIES || \
485 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
487 Say Y here to be able to disable and re-enable individual
488 CPUs at runtime on SMP machines.
490 Say N if you are unsure.
492 config ARCH_CPU_PROBE_RELEASE
494 depends on HOTPLUG_CPU
496 config ARCH_ENABLE_MEMORY_HOTPLUG
499 config ARCH_HAS_WALK_MEMORY
502 config ARCH_ENABLE_MEMORY_HOTREMOVE
505 config PPC64_SUPPORTS_MEMORY_FAILURE
506 bool "Add support for memory hwpoison"
507 depends on PPC_BOOK3S_64
508 default "y" if PPC_POWERNV
509 select ARCH_SUPPORTS_MEMORY_FAILURE
512 bool "kexec system call"
513 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
516 kexec is a system call that implements the ability to shutdown your
517 current kernel, and to start another kernel. It is like a reboot
518 but it is independent of the system firmware. And like a reboot
519 you can start any kernel with it, not just Linux.
521 The name comes from the similarity to the exec system call.
523 It is an ongoing process to be certain the hardware in a machine
524 is properly shutdown, so do not be surprised if this code does not
525 initially work for you. As of this writing the exact hardware
526 interface is strongly in flux, so no good recommendation can be
530 bool "kexec file based system call"
532 select HAVE_IMA_KEXEC
536 depends on CRYPTO_SHA256=y
538 This is a new version of the kexec system call. This call is
539 file based and takes in file descriptors as system call arguments
540 for kernel and initramfs as opposed to a list of segments as is the
541 case for the older kexec call.
543 config ARCH_HAS_KEXEC_PURGATORY
547 bool "Build a relocatable kernel"
548 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
549 select NONSTATIC_KERNEL
550 select MODULE_REL_CRCS if MODVERSIONS
552 This builds a kernel image that is capable of running at the
553 location the kernel is loaded at. For ppc32, there is no any
554 alignment restrictions, and this feature is a superset of
555 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
556 16k-aligned base address. The kernel is linked as a
557 position-independent executable (PIE) and contains dynamic relocations
558 which are processed early in the bootup process.
560 One use is for the kexec on panic case where the recovery kernel
561 must live at a different physical address than the primary
564 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
565 it has been loaded at and the compile time physical addresses
566 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
567 setting can still be useful to bootwrappers that need to know the
568 load address of the kernel (eg. u-boot/mkimage).
570 config RELOCATABLE_TEST
571 bool "Test relocatable kernel"
572 depends on (PPC64 && RELOCATABLE)
575 This runs the relocatable kernel at the address it was initially
576 loaded at, which tends to be non-zero and therefore test the
580 bool "Build a dump capture kernel"
581 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
582 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
584 Build a kernel suitable for use as a dump capture kernel.
585 The same kernel binary can be used as production kernel and dump
589 bool "Firmware-assisted dump"
590 depends on PPC64 && PPC_RTAS
594 A robust mechanism to get reliable kernel crash dump with
595 assistance from firmware. This approach does not use kexec,
596 instead firmware assists in booting the capture kernel
597 while preserving memory contents. Firmware-assisted dump
598 is meant to be a kdump replacement offering robustness and
599 speed not possible without system firmware assistance.
604 bool "Distribute interrupts on all CPUs by default"
607 This option gives the kernel permission to distribute IRQs across
608 multiple CPUs. Saying N here will route all IRQs to the first
609 CPU. Generally saying Y is safe, although some problems have been
610 reported with SMP Power Macintoshes with this option enabled.
615 default y if SMP && PPC_PSERIES
621 depends on NEED_MULTIPLE_NODES
623 config USE_PERCPU_NUMA_NODE_ID
627 config HAVE_MEMORYLESS_NODES
631 config ARCH_SELECT_MEMORY_MODEL
635 config ARCH_FLATMEM_ENABLE
637 depends on (PPC64 && !NUMA) || PPC32
639 config ARCH_SPARSEMEM_ENABLE
642 select SPARSEMEM_VMEMMAP_ENABLE
644 config ARCH_SPARSEMEM_DEFAULT
646 depends on PPC_BOOK3S_64
648 config SYS_SUPPORTS_HUGETLBFS
651 config ILLEGAL_POINTER_VALUE
653 # This is roughly half way between the top of user space and the bottom
654 # of kernel space, which seems about as good as we can get.
655 default 0x5deadbeef0000000 if PPC64
660 config ARCH_MEMORY_PROBE
662 depends on MEMORY_HOTPLUG
664 # Some NUMA nodes have memory ranges that span
665 # other nodes. Even though a pfn is valid and
666 # between a node's start and end pfns, it may not
667 # reside on that node. See memmap_init_zone()
669 config NODES_SPAN_OTHER_NODES
671 depends on NEED_MULTIPLE_NODES
674 bool "Using standard binutils settings"
678 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
679 Note, that kernel will be able to run only those applications,
680 which had been compiled using binutils later than 2.17.50.0.3 with
681 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
682 the older binutils, you can patch them with a trivial patch, which
683 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
689 Select the kernel logical page size. Increasing the page size
690 will reduce software overhead at each page boundary, allow
691 hardware prefetch mechanisms to be more effective, and allow
692 larger dma transfers increasing IO efficiency and reducing
693 overhead. However the utilization of memory will increase.
694 For example, each cached file will using a multiple of the
695 page size to hold its contents and the difference between the
696 end of file and the end of page is wasted.
698 Some dedicated systems, such as software raid serving with
699 accelerated calculations, have shown significant increases.
701 If you configure a 64 bit kernel for 64k pages but the
702 processor does not support them, then the kernel will simulate
703 them with 4k pages, loading them on demand, but with the
704 reduced software overhead and larger internal fragmentation.
705 For the 32 bit kernel, a large page option will not be offered
706 unless it is supported by the configured processor.
708 If unsure, choose 4K_PAGES.
712 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
716 depends on 44x || PPC_8xx
720 depends on !PPC_FSL_BOOK3E && (44x || PPC_BOOK3S_64 || PPC_BOOK3E_64)
721 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
723 config PPC_256K_PAGES
724 bool "256k page size"
725 depends on 44x && !STDBINUTILS
727 Make the page size 256k.
729 As the ELF standard only requires alignment to support page
730 sizes up to 64k, you will need to compile all of your user
731 space applications with a non-standard binutils settings
732 (see the STDBINUTILS description for details).
734 Say N unless you know what you are doing.
739 int "Thread shift" if EXPERT
741 default "15" if PPC_256K_PAGES
742 default "14" if PPC64
745 Used to define the stack size. The default is almost always what you
746 want. Only change this if you know what you are doing.
748 config FORCE_MAX_ZONEORDER
749 int "Maximum zone order"
750 range 8 9 if PPC64 && PPC_64K_PAGES
751 default "9" if PPC64 && PPC_64K_PAGES
752 range 13 13 if PPC64 && !PPC_64K_PAGES
753 default "13" if PPC64 && !PPC_64K_PAGES
754 range 9 64 if PPC32 && PPC_16K_PAGES
755 default "9" if PPC32 && PPC_16K_PAGES
756 range 7 64 if PPC32 && PPC_64K_PAGES
757 default "7" if PPC32 && PPC_64K_PAGES
758 range 5 64 if PPC32 && PPC_256K_PAGES
759 default "5" if PPC32 && PPC_256K_PAGES
763 The kernel memory allocator divides physically contiguous memory
764 blocks into "zones", where each zone is a power of two number of
765 pages. This option selects the largest power of two that the kernel
766 keeps in the memory allocator. If you need to allocate very large
767 blocks of physically contiguous memory, then you may need to
770 This config option is actually maximum order plus one. For example,
771 a value of 11 means that the largest free memory block is 2^10 pages.
773 The page size is not necessarily 4KB. For example, on 64-bit
774 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
775 this in mind when choosing a value for this option.
777 config PPC_SUBPAGE_PROT
778 bool "Support setting protections for 4k subpages"
779 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
781 This option adds support for a system call to allow user programs
782 to set access permissions (read/write, readonly, or no access)
783 on the 4k subpages of each 64k page.
785 config PPC_COPRO_BASE
790 bool "SMT (Hyperthreading) scheduler support"
791 depends on PPC64 && SMP
793 SMT scheduler support improves the CPU scheduler's decision making
794 when dealing with POWER5 cpus at a cost of slightly increased
795 overhead in some places. If unsure say N here.
797 config PPC_DENORMALISATION
798 bool "PowerPC denormalisation exception handling"
799 depends on PPC_BOOK3S_64
800 default "y" if PPC_POWERNV
802 Add support for handling denormalisation of single precision
803 values. Useful for bare metal only. If unsure say Y here.
806 bool "Default bootloader kernel arguments"
809 string "Initial kernel command string"
810 depends on CMDLINE_BOOL
811 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
813 On some platforms, there is currently no way for the boot loader to
814 pass arguments to the kernel. For these platforms, you can supply
815 some command-line options at build time by entering them here. In
816 most cases you will need to specify the root device here.
819 bool "Always use the default kernel command string"
820 depends on CMDLINE_BOOL
822 Always use the default kernel command string, even if the boot
823 loader passes other arguments to the kernel.
824 This is useful if you cannot or don't want to change the
825 command-line options your boot loader passes to the kernel.
828 string "Additional default image types"
830 List additional targets to be built by the bootwrapper here (separated
831 by spaces). This is useful for targets that depend of device tree
832 files in the .dts directory.
834 Targets in this list will be build as part of the default build
835 target, or when the user does a 'make zImage' or a
836 'make zImage.initrd'.
838 If unsure, leave blank
840 config ARCH_WANTS_FREEZER_CONTROL
844 source kernel/power/Kconfig
847 bool "Enable seccomp to safely compute untrusted bytecode"
851 This kernel feature is useful for number crunching applications
852 that may need to compute untrusted bytecode during their
853 execution. By using pipes or other transports made available to
854 the process as file descriptors supporting the read/write
855 syscalls, it's possible to isolate those applications in
856 their own address space using seccomp. Once seccomp is
857 enabled via /proc/<pid>/seccomp, it cannot be disabled
858 and the task is only allowed to execute a few safe syscalls
859 defined by each seccomp mode.
861 If unsure, say Y. Only embedded should say N here.
864 prompt "PowerPC Memory Protection Keys"
866 depends on PPC_BOOK3S_64
867 select ARCH_USES_HIGH_VMA_FLAGS
868 select ARCH_HAS_PKEYS
870 Memory Protection Keys provides a mechanism for enforcing
871 page-based protections, but without requiring modification of the
872 page tables when an application changes protection domains.
874 For details, see Documentation/vm/protection-keys.rst
887 bool "Support for ISA-bus hardware"
891 Find out whether you have ISA slots on your motherboard. ISA is the
892 name of a bus system, i.e. the way the CPU talks to the other stuff
893 inside your box. If you have an Apple machine, say N here; if you
894 have an IBM RS/6000 or pSeries machine, say Y. If you have an
895 embedded board, consult your board documentation.
901 config NEED_DMA_MAP_STATE
902 def_bool (PPC64 || NOT_COHERENT_CACHE)
904 config GENERIC_ISA_DMA
906 depends on ISA_DMA_API
909 config PPC_INDIRECT_PCI
912 default y if 40x || 44x
926 select PPC_INDIRECT_PCI
932 depends on SUSPEND && (PPC_85xx || PPC_86xx)
934 Freescale MPC85xx/MPC86xx power management controller support
935 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
940 depends on SUSPEND && (44x || 40x)
942 PPC4xx Clock Power Management (CPM) support (suspend/resume).
943 It also enables support for two different idle states (idle-wait
950 bool "Freescale Local Bus support"
952 Enables reporting of errors from the Freescale local bus
953 controller. Also contains some common code used by
954 drivers for specific local bus peripherals.
958 depends on PPC_83xx || QUICC_ENGINE || CPM2
960 Freescale General-purpose Timers support
962 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
966 # Platforms that what PCI turned unconditionally just do select PCI
967 # in their config node. Platforms that want to choose at config
968 # time should select PPC_PCI_CHOICE
969 config PPC_PCI_CHOICE
973 bool "PCI support" if PPC_PCI_CHOICE
974 default y if !40x && !CPM2 && !PPC_8xx && !PPC_83xx \
975 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
976 default PCI_QSPAN if PPC_8xx
977 select GENERIC_PCI_IOMAP
979 Find out whether your system includes a PCI bus. PCI is the name of
980 a bus system, i.e. the way the CPU talks to the other stuff inside
981 your box. If you say Y here, the kernel will include drivers and
982 infrastructure code to support PCI bus devices.
995 Say Y here if you have a system based on a Motorola 8xx-series
996 embedded processor with a QSPAN PCI interface, otherwise say N.
1000 depends on PCI && 8260
1001 select PPC_INDIRECT_PCI
1004 source "drivers/pci/Kconfig"
1006 source "drivers/pcmcia/Kconfig"
1013 tristate "RapidIO support"
1014 depends on HAS_RAPIDIO || PCI
1016 If you say Y here, the kernel will include drivers and
1017 infrastructure code to support RapidIO interconnect devices.
1020 bool "Freescale Embedded SRIO Controller support"
1021 depends on RAPIDIO = y && HAS_RAPIDIO
1024 Include support for RapidIO controller on Freescale embedded
1025 processors (MPC8548, MPC8641, etc).
1027 source "drivers/rapidio/Kconfig"
1031 config NONSTATIC_KERNEL
1035 menu "Advanced setup"
1038 config ADVANCED_OPTIONS
1039 bool "Prompt for advanced kernel configuration options"
1041 This option will enable prompting for a variety of advanced kernel
1042 configuration options. These options can cause the kernel to not
1043 work if they are set incorrectly, but can be used to optimize certain
1044 aspects of kernel memory management.
1046 Unless you know what you are doing, say N here.
1048 comment "Default settings for advanced configuration options are used"
1049 depends on !ADVANCED_OPTIONS
1051 config LOWMEM_SIZE_BOOL
1052 bool "Set maximum low memory"
1053 depends on ADVANCED_OPTIONS
1055 This option allows you to set the maximum amount of memory which
1056 will be used as "low memory", that is, memory which the kernel can
1057 access directly, without having to set up a kernel virtual mapping.
1058 This can be useful in optimizing the layout of kernel virtual
1061 Say N here unless you know what you are doing.
1064 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1065 default "0x30000000"
1067 config LOWMEM_CAM_NUM_BOOL
1068 bool "Set number of CAMs to use to map low memory"
1069 depends on ADVANCED_OPTIONS && FSL_BOOKE
1071 This option allows you to set the maximum number of CAM slots that
1072 will be used to map low memory. There are a limited number of slots
1073 available and even more limited number that will fit in the L1 MMU.
1074 However, using more entries will allow mapping more low memory. This
1075 can be useful in optimizing the layout of kernel virtual memory.
1077 Say N here unless you know what you are doing.
1079 config LOWMEM_CAM_NUM
1080 depends on FSL_BOOKE
1081 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1084 config DYNAMIC_MEMSTART
1085 bool "Enable page aligned dynamic load address for kernel"
1086 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1087 select NONSTATIC_KERNEL
1089 This option enables the kernel to be loaded at any page aligned
1090 physical address. The kernel creates a mapping from KERNELBASE to
1091 the address where the kernel is loaded. The page size here implies
1092 the TLB page size of the mapping for kernel on the particular platform.
1093 Please refer to the init code for finding the TLB page size.
1095 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1096 kernel image, where the only restriction is the page aligned kernel
1097 load address. When this option is enabled, the compile time physical
1098 address CONFIG_PHYSICAL_START is ignored.
1100 This option is overridden by CONFIG_RELOCATABLE
1102 config PAGE_OFFSET_BOOL
1103 bool "Set custom page offset address"
1104 depends on ADVANCED_OPTIONS
1106 This option allows you to set the kernel virtual address at which
1107 the kernel will map low memory. This can be useful in optimizing
1108 the virtual memory layout of the system.
1110 Say N here unless you know what you are doing.
1113 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1114 default "0xc0000000"
1116 config KERNEL_START_BOOL
1117 bool "Set custom kernel base address"
1118 depends on ADVANCED_OPTIONS
1120 This option allows you to set the kernel virtual address at which
1121 the kernel will be loaded. Normally this should match PAGE_OFFSET
1122 however there are times (like kdump) that one might not want them
1125 Say N here unless you know what you are doing.
1128 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1129 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1130 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1131 default "0xc0000000"
1133 config PHYSICAL_START_BOOL
1134 bool "Set physical address where the kernel is loaded"
1135 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1137 This gives the physical address where the kernel is loaded.
1139 Say N here unless you know what you are doing.
1141 config PHYSICAL_START
1142 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1143 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1144 default "0x00000000"
1146 config PHYSICAL_ALIGN
1148 default "0x04000000" if FSL_BOOKE
1150 This value puts the alignment restrictions on physical address
1151 where kernel is loaded and run from. Kernel is compiled for an
1152 address which meets above alignment restriction.
1154 config TASK_SIZE_BOOL
1155 bool "Set custom user task size"
1156 depends on ADVANCED_OPTIONS
1158 This option allows you to set the amount of virtual address space
1159 allocated to user tasks. This can be useful in optimizing the
1160 virtual memory layout of the system.
1162 Say N here unless you know what you are doing.
1165 hex "Size of user task space" if TASK_SIZE_BOOL
1166 default "0x80000000" if PPC_8xx
1167 default "0xc0000000"
1169 config CONSISTENT_SIZE_BOOL
1170 bool "Set custom consistent memory pool size"
1171 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1173 This option allows you to set the size of the
1174 consistent memory pool. This pool of virtual memory
1175 is used to make consistent memory allocations.
1177 config CONSISTENT_SIZE
1178 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1179 default "0x00200000" if NOT_COHERENT_CACHE
1182 bool "Pinned Kernel TLBs (860 ONLY)"
1183 depends on ADVANCED_OPTIONS && PPC_8xx && \
1184 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1187 bool "Pinned TLB for DATA"
1192 bool "Pinned TLB for IMMR"
1197 bool "Pinned TLB for TEXT"
1203 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1206 default "0xc000000000000000"
1209 default "0xc000000000000000"
1210 config PHYSICAL_START
1212 default "0x00000000"
1218 source "net/Kconfig"
1220 source "drivers/Kconfig"
1224 source "lib/Kconfig"
1226 source "arch/powerpc/Kconfig.debug"
1228 source "security/Kconfig"
1230 source "crypto/Kconfig"
1232 config PPC_LIB_RHEAP
1235 source "arch/powerpc/kvm/Kconfig"
1237 source "kernel/livepatch/Kconfig"