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_MEMBARRIER_CALLBACKS
139 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE
140 select ARCH_HAS_SG_CHAIN
141 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION)
142 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
143 select ARCH_HAS_UACCESS_FLUSHCACHE if PPC64
144 select ARCH_HAS_UBSAN_SANITIZE_ALL
145 select ARCH_HAS_ZONE_DEVICE if PPC_BOOK3S_64
146 select ARCH_HAVE_NMI_SAFE_CMPXCHG
147 select ARCH_MIGHT_HAVE_PC_PARPORT
148 select ARCH_MIGHT_HAVE_PC_SERIO
149 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
150 select ARCH_SUPPORTS_ATOMIC_RMW
151 select ARCH_USE_BUILTIN_BSWAP
152 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
153 select ARCH_WANT_IPC_PARSE_VERSION
154 select ARCH_WEAK_RELEASE_ACQUIRE
156 select BUILDTIME_EXTABLE_SORT
157 select CLONE_BACKWARDS
158 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
159 select EDAC_ATOMIC_SCRUB
161 select GENERIC_ATOMIC64 if PPC32
162 select GENERIC_CLOCKEVENTS
163 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
164 select GENERIC_CMOS_UPDATE
165 select GENERIC_CPU_AUTOPROBE
166 select GENERIC_CPU_VULNERABILITIES if PPC_BOOK3S_64
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 HAVE_CBPF_JIT if !PPC64
181 select HAVE_CONTEXT_TRACKING if PPC64
182 select HAVE_DEBUG_KMEMLEAK
183 select HAVE_DEBUG_STACKOVERFLOW
184 select HAVE_DYNAMIC_FTRACE
185 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
186 select HAVE_EBPF_JIT if PPC64
187 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
188 select HAVE_FTRACE_MCOUNT_RECORD
189 select HAVE_FUNCTION_GRAPH_TRACER
190 select HAVE_FUNCTION_TRACER
191 select HAVE_GCC_PLUGINS
192 select HAVE_GENERIC_GUP
193 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
195 select HAVE_IOREMAP_PROT
196 select HAVE_IRQ_EXIT_ON_IRQ_STACK
197 select HAVE_KERNEL_GZIP
199 select HAVE_KPROBES_ON_FTRACE
200 select HAVE_KRETPROBES
201 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
202 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
204 select HAVE_MEMBLOCK_NODE_MAP
205 select HAVE_MOD_ARCH_SPECIFIC
206 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
207 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
209 select HAVE_OPTPROBES if PPC64
210 select HAVE_PERF_EVENTS
211 select HAVE_PERF_EVENTS_NMI if PPC64
212 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
213 select HAVE_PERF_REGS
214 select HAVE_PERF_USER_STACK_DUMP
215 select HAVE_RCU_TABLE_FREE if SMP
216 select HAVE_REGS_AND_STACK_ACCESS_API
217 select HAVE_SYSCALL_TRACEPOINTS
218 select HAVE_VIRT_CPU_ACCOUNTING
219 select HAVE_IRQ_TIME_ACCOUNTING
220 select IOMMU_HELPER if PPC64
222 select IRQ_FORCED_THREADING
223 select MODULES_USE_ELF_RELA
224 select NEED_SG_DMA_LENGTH
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_BOOK3S_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
478 bool "Support for enabling/disabling CPUs"
479 depends on SMP && (PPC_PSERIES || \
480 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
482 Say Y here to be able to disable and re-enable individual
483 CPUs at runtime on SMP machines.
485 Say N if you are unsure.
487 config ARCH_CPU_PROBE_RELEASE
489 depends on HOTPLUG_CPU
491 config ARCH_ENABLE_MEMORY_HOTPLUG
494 config ARCH_HAS_WALK_MEMORY
497 config ARCH_ENABLE_MEMORY_HOTREMOVE
500 config PPC64_SUPPORTS_MEMORY_FAILURE
501 bool "Add support for memory hwpoison"
502 depends on PPC_BOOK3S_64
503 default "y" if PPC_POWERNV
504 select ARCH_SUPPORTS_MEMORY_FAILURE
507 bool "kexec system call"
508 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
511 kexec is a system call that implements the ability to shutdown your
512 current kernel, and to start another kernel. It is like a reboot
513 but it is independent of the system firmware. And like a reboot
514 you can start any kernel with it, not just Linux.
516 The name comes from the similarity to the exec system call.
518 It is an ongoing process to be certain the hardware in a machine
519 is properly shutdown, so do not be surprised if this code does not
520 initially work for you. As of this writing the exact hardware
521 interface is strongly in flux, so no good recommendation can be
525 bool "kexec file based system call"
527 select HAVE_IMA_KEXEC
531 depends on CRYPTO_SHA256=y
533 This is a new version of the kexec system call. This call is
534 file based and takes in file descriptors as system call arguments
535 for kernel and initramfs as opposed to a list of segments as is the
536 case for the older kexec call.
538 config ARCH_HAS_KEXEC_PURGATORY
542 bool "Build a relocatable kernel"
543 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
544 select NONSTATIC_KERNEL
545 select MODULE_REL_CRCS if MODVERSIONS
547 This builds a kernel image that is capable of running at the
548 location the kernel is loaded at. For ppc32, there is no any
549 alignment restrictions, and this feature is a superset of
550 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
551 16k-aligned base address. The kernel is linked as a
552 position-independent executable (PIE) and contains dynamic relocations
553 which are processed early in the bootup process.
555 One use is for the kexec on panic case where the recovery kernel
556 must live at a different physical address than the primary
559 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
560 it has been loaded at and the compile time physical addresses
561 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
562 setting can still be useful to bootwrappers that need to know the
563 load address of the kernel (eg. u-boot/mkimage).
565 config RELOCATABLE_TEST
566 bool "Test relocatable kernel"
567 depends on (PPC64 && RELOCATABLE)
570 This runs the relocatable kernel at the address it was initially
571 loaded at, which tends to be non-zero and therefore test the
575 bool "Build a dump capture kernel"
576 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
577 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
579 Build a kernel suitable for use as a dump capture kernel.
580 The same kernel binary can be used as production kernel and dump
584 bool "Firmware-assisted dump"
585 depends on PPC64 && PPC_RTAS
589 A robust mechanism to get reliable kernel crash dump with
590 assistance from firmware. This approach does not use kexec,
591 instead firmware assists in booting the capture kernel
592 while preserving memory contents. Firmware-assisted dump
593 is meant to be a kdump replacement offering robustness and
594 speed not possible without system firmware assistance.
599 bool "Distribute interrupts on all CPUs by default"
602 This option gives the kernel permission to distribute IRQs across
603 multiple CPUs. Saying N here will route all IRQs to the first
604 CPU. Generally saying Y is safe, although some problems have been
605 reported with SMP Power Macintoshes with this option enabled.
610 default y if SMP && PPC_PSERIES
616 depends on NEED_MULTIPLE_NODES
618 config USE_PERCPU_NUMA_NODE_ID
622 config HAVE_MEMORYLESS_NODES
626 config ARCH_SELECT_MEMORY_MODEL
630 config ARCH_FLATMEM_ENABLE
632 depends on (PPC64 && !NUMA) || PPC32
634 config ARCH_SPARSEMEM_ENABLE
637 select SPARSEMEM_VMEMMAP_ENABLE
639 config ARCH_SPARSEMEM_DEFAULT
641 depends on PPC_BOOK3S_64
643 config SYS_SUPPORTS_HUGETLBFS
646 config ILLEGAL_POINTER_VALUE
648 # This is roughly half way between the top of user space and the bottom
649 # of kernel space, which seems about as good as we can get.
650 default 0x5deadbeef0000000 if PPC64
655 config ARCH_MEMORY_PROBE
657 depends on MEMORY_HOTPLUG
659 # Some NUMA nodes have memory ranges that span
660 # other nodes. Even though a pfn is valid and
661 # between a node's start and end pfns, it may not
662 # reside on that node. See memmap_init_zone()
664 config NODES_SPAN_OTHER_NODES
666 depends on NEED_MULTIPLE_NODES
669 bool "Using standard binutils settings"
673 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
674 Note, that kernel will be able to run only those applications,
675 which had been compiled using binutils later than 2.17.50.0.3 with
676 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
677 the older binutils, you can patch them with a trivial patch, which
678 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
684 Select the kernel logical page size. Increasing the page size
685 will reduce software overhead at each page boundary, allow
686 hardware prefetch mechanisms to be more effective, and allow
687 larger dma transfers increasing IO efficiency and reducing
688 overhead. However the utilization of memory will increase.
689 For example, each cached file will using a multiple of the
690 page size to hold its contents and the difference between the
691 end of file and the end of page is wasted.
693 Some dedicated systems, such as software raid serving with
694 accelerated calculations, have shown significant increases.
696 If you configure a 64 bit kernel for 64k pages but the
697 processor does not support them, then the kernel will simulate
698 them with 4k pages, loading them on demand, but with the
699 reduced software overhead and larger internal fragmentation.
700 For the 32 bit kernel, a large page option will not be offered
701 unless it is supported by the configured processor.
703 If unsure, choose 4K_PAGES.
707 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
711 depends on 44x || PPC_8xx
715 depends on !PPC_FSL_BOOK3E && (44x || PPC_BOOK3S_64 || PPC_BOOK3E_64)
716 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
718 config PPC_256K_PAGES
719 bool "256k page size"
720 depends on 44x && !STDBINUTILS
722 Make the page size 256k.
724 As the ELF standard only requires alignment to support page
725 sizes up to 64k, you will need to compile all of your user
726 space applications with a non-standard binutils settings
727 (see the STDBINUTILS description for details).
729 Say N unless you know what you are doing.
734 int "Thread shift" if EXPERT
736 default "15" if PPC_256K_PAGES
737 default "14" if PPC64
740 Used to define the stack size. The default is almost always what you
741 want. Only change this if you know what you are doing.
743 config FORCE_MAX_ZONEORDER
744 int "Maximum zone order"
745 range 8 9 if PPC64 && PPC_64K_PAGES
746 default "9" if PPC64 && PPC_64K_PAGES
747 range 13 13 if PPC64 && !PPC_64K_PAGES
748 default "13" if PPC64 && !PPC_64K_PAGES
749 range 9 64 if PPC32 && PPC_16K_PAGES
750 default "9" if PPC32 && PPC_16K_PAGES
751 range 7 64 if PPC32 && PPC_64K_PAGES
752 default "7" if PPC32 && PPC_64K_PAGES
753 range 5 64 if PPC32 && PPC_256K_PAGES
754 default "5" if PPC32 && PPC_256K_PAGES
758 The kernel memory allocator divides physically contiguous memory
759 blocks into "zones", where each zone is a power of two number of
760 pages. This option selects the largest power of two that the kernel
761 keeps in the memory allocator. If you need to allocate very large
762 blocks of physically contiguous memory, then you may need to
765 This config option is actually maximum order plus one. For example,
766 a value of 11 means that the largest free memory block is 2^10 pages.
768 The page size is not necessarily 4KB. For example, on 64-bit
769 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
770 this in mind when choosing a value for this option.
772 config PPC_SUBPAGE_PROT
773 bool "Support setting protections for 4k subpages"
774 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
776 This option adds support for a system call to allow user programs
777 to set access permissions (read/write, readonly, or no access)
778 on the 4k subpages of each 64k page.
780 config PPC_COPRO_BASE
785 bool "SMT (Hyperthreading) scheduler support"
786 depends on PPC64 && SMP
788 SMT scheduler support improves the CPU scheduler's decision making
789 when dealing with POWER5 cpus at a cost of slightly increased
790 overhead in some places. If unsure say N here.
792 config PPC_DENORMALISATION
793 bool "PowerPC denormalisation exception handling"
794 depends on PPC_BOOK3S_64
795 default "y" if PPC_POWERNV
797 Add support for handling denormalisation of single precision
798 values. Useful for bare metal only. If unsure say Y here.
801 bool "Default bootloader kernel arguments"
804 string "Initial kernel command string"
805 depends on CMDLINE_BOOL
806 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
808 On some platforms, there is currently no way for the boot loader to
809 pass arguments to the kernel. For these platforms, you can supply
810 some command-line options at build time by entering them here. In
811 most cases you will need to specify the root device here.
814 bool "Always use the default kernel command string"
815 depends on CMDLINE_BOOL
817 Always use the default kernel command string, even if the boot
818 loader passes other arguments to the kernel.
819 This is useful if you cannot or don't want to change the
820 command-line options your boot loader passes to the kernel.
823 string "Additional default image types"
825 List additional targets to be built by the bootwrapper here (separated
826 by spaces). This is useful for targets that depend of device tree
827 files in the .dts directory.
829 Targets in this list will be build as part of the default build
830 target, or when the user does a 'make zImage' or a
831 'make zImage.initrd'.
833 If unsure, leave blank
835 config ARCH_WANTS_FREEZER_CONTROL
839 source kernel/power/Kconfig
842 bool "Enable seccomp to safely compute untrusted bytecode"
846 This kernel feature is useful for number crunching applications
847 that may need to compute untrusted bytecode during their
848 execution. By using pipes or other transports made available to
849 the process as file descriptors supporting the read/write
850 syscalls, it's possible to isolate those applications in
851 their own address space using seccomp. Once seccomp is
852 enabled via /proc/<pid>/seccomp, it cannot be disabled
853 and the task is only allowed to execute a few safe syscalls
854 defined by each seccomp mode.
856 If unsure, say Y. Only embedded should say N here.
859 prompt "PowerPC Memory Protection Keys"
861 depends on PPC_BOOK3S_64
862 select ARCH_USES_HIGH_VMA_FLAGS
863 select ARCH_HAS_PKEYS
865 Memory Protection Keys provides a mechanism for enforcing
866 page-based protections, but without requiring modification of the
867 page tables when an application changes protection domains.
869 For details, see Documentation/vm/protection-keys.rst
882 bool "Support for ISA-bus hardware"
886 Find out whether you have ISA slots on your motherboard. ISA is the
887 name of a bus system, i.e. the way the CPU talks to the other stuff
888 inside your box. If you have an Apple machine, say N here; if you
889 have an IBM RS/6000 or pSeries machine, say Y. If you have an
890 embedded board, consult your board documentation.
896 config NEED_DMA_MAP_STATE
897 def_bool (PPC64 || NOT_COHERENT_CACHE)
899 config GENERIC_ISA_DMA
901 depends on ISA_DMA_API
904 config PPC_INDIRECT_PCI
907 default y if 40x || 44x
921 select PPC_INDIRECT_PCI
927 depends on SUSPEND && (PPC_85xx || PPC_86xx)
929 Freescale MPC85xx/MPC86xx power management controller support
930 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
935 depends on SUSPEND && (44x || 40x)
937 PPC4xx Clock Power Management (CPM) support (suspend/resume).
938 It also enables support for two different idle states (idle-wait
945 bool "Freescale Local Bus support"
947 Enables reporting of errors from the Freescale local bus
948 controller. Also contains some common code used by
949 drivers for specific local bus peripherals.
953 depends on PPC_83xx || QUICC_ENGINE || CPM2
955 Freescale General-purpose Timers support
957 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
961 # Platforms that what PCI turned unconditionally just do select PCI
962 # in their config node. Platforms that want to choose at config
963 # time should select PPC_PCI_CHOICE
964 config PPC_PCI_CHOICE
968 bool "PCI support" if PPC_PCI_CHOICE
969 default y if !40x && !CPM2 && !PPC_8xx && !PPC_83xx \
970 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
971 default PCI_QSPAN if PPC_8xx
972 select GENERIC_PCI_IOMAP
974 Find out whether your system includes a PCI bus. PCI is the name of
975 a bus system, i.e. the way the CPU talks to the other stuff inside
976 your box. If you say Y here, the kernel will include drivers and
977 infrastructure code to support PCI bus devices.
990 Say Y here if you have a system based on a Motorola 8xx-series
991 embedded processor with a QSPAN PCI interface, otherwise say N.
995 depends on PCI && 8260
996 select PPC_INDIRECT_PCI
999 source "drivers/pci/Kconfig"
1001 source "drivers/pcmcia/Kconfig"
1008 tristate "RapidIO support"
1009 depends on HAS_RAPIDIO || PCI
1011 If you say Y here, the kernel will include drivers and
1012 infrastructure code to support RapidIO interconnect devices.
1015 bool "Freescale Embedded SRIO Controller support"
1016 depends on RAPIDIO = y && HAS_RAPIDIO
1019 Include support for RapidIO controller on Freescale embedded
1020 processors (MPC8548, MPC8641, etc).
1022 source "drivers/rapidio/Kconfig"
1026 config NONSTATIC_KERNEL
1030 menu "Advanced setup"
1033 config ADVANCED_OPTIONS
1034 bool "Prompt for advanced kernel configuration options"
1036 This option will enable prompting for a variety of advanced kernel
1037 configuration options. These options can cause the kernel to not
1038 work if they are set incorrectly, but can be used to optimize certain
1039 aspects of kernel memory management.
1041 Unless you know what you are doing, say N here.
1043 comment "Default settings for advanced configuration options are used"
1044 depends on !ADVANCED_OPTIONS
1046 config LOWMEM_SIZE_BOOL
1047 bool "Set maximum low memory"
1048 depends on ADVANCED_OPTIONS
1050 This option allows you to set the maximum amount of memory which
1051 will be used as "low memory", that is, memory which the kernel can
1052 access directly, without having to set up a kernel virtual mapping.
1053 This can be useful in optimizing the layout of kernel virtual
1056 Say N here unless you know what you are doing.
1059 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1060 default "0x30000000"
1062 config LOWMEM_CAM_NUM_BOOL
1063 bool "Set number of CAMs to use to map low memory"
1064 depends on ADVANCED_OPTIONS && FSL_BOOKE
1066 This option allows you to set the maximum number of CAM slots that
1067 will be used to map low memory. There are a limited number of slots
1068 available and even more limited number that will fit in the L1 MMU.
1069 However, using more entries will allow mapping more low memory. This
1070 can be useful in optimizing the layout of kernel virtual memory.
1072 Say N here unless you know what you are doing.
1074 config LOWMEM_CAM_NUM
1075 depends on FSL_BOOKE
1076 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1079 config DYNAMIC_MEMSTART
1080 bool "Enable page aligned dynamic load address for kernel"
1081 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1082 select NONSTATIC_KERNEL
1084 This option enables the kernel to be loaded at any page aligned
1085 physical address. The kernel creates a mapping from KERNELBASE to
1086 the address where the kernel is loaded. The page size here implies
1087 the TLB page size of the mapping for kernel on the particular platform.
1088 Please refer to the init code for finding the TLB page size.
1090 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1091 kernel image, where the only restriction is the page aligned kernel
1092 load address. When this option is enabled, the compile time physical
1093 address CONFIG_PHYSICAL_START is ignored.
1095 This option is overridden by CONFIG_RELOCATABLE
1097 config PAGE_OFFSET_BOOL
1098 bool "Set custom page offset address"
1099 depends on ADVANCED_OPTIONS
1101 This option allows you to set the kernel virtual address at which
1102 the kernel will map low memory. This can be useful in optimizing
1103 the virtual memory layout of the system.
1105 Say N here unless you know what you are doing.
1108 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1109 default "0xc0000000"
1111 config KERNEL_START_BOOL
1112 bool "Set custom kernel base address"
1113 depends on ADVANCED_OPTIONS
1115 This option allows you to set the kernel virtual address at which
1116 the kernel will be loaded. Normally this should match PAGE_OFFSET
1117 however there are times (like kdump) that one might not want them
1120 Say N here unless you know what you are doing.
1123 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1124 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1125 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1126 default "0xc0000000"
1128 config PHYSICAL_START_BOOL
1129 bool "Set physical address where the kernel is loaded"
1130 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1132 This gives the physical address where the kernel is loaded.
1134 Say N here unless you know what you are doing.
1136 config PHYSICAL_START
1137 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1138 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1139 default "0x00000000"
1141 config PHYSICAL_ALIGN
1143 default "0x04000000" if FSL_BOOKE
1145 This value puts the alignment restrictions on physical address
1146 where kernel is loaded and run from. Kernel is compiled for an
1147 address which meets above alignment restriction.
1149 config TASK_SIZE_BOOL
1150 bool "Set custom user task size"
1151 depends on ADVANCED_OPTIONS
1153 This option allows you to set the amount of virtual address space
1154 allocated to user tasks. This can be useful in optimizing the
1155 virtual memory layout of the system.
1157 Say N here unless you know what you are doing.
1160 hex "Size of user task space" if TASK_SIZE_BOOL
1161 default "0x80000000" if PPC_8xx
1162 default "0xc0000000"
1164 config CONSISTENT_SIZE_BOOL
1165 bool "Set custom consistent memory pool size"
1166 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1168 This option allows you to set the size of the
1169 consistent memory pool. This pool of virtual memory
1170 is used to make consistent memory allocations.
1172 config CONSISTENT_SIZE
1173 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1174 default "0x00200000" if NOT_COHERENT_CACHE
1177 bool "Pinned Kernel TLBs (860 ONLY)"
1178 depends on ADVANCED_OPTIONS && PPC_8xx && \
1179 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1182 bool "Pinned TLB for DATA"
1187 bool "Pinned TLB for IMMR"
1192 bool "Pinned TLB for TEXT"
1198 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1201 default "0xc000000000000000"
1204 default "0xc000000000000000"
1205 config PHYSICAL_START
1207 default "0x00000000"
1213 source "net/Kconfig"
1215 source "drivers/Kconfig"
1219 source "lib/Kconfig"
1221 source "arch/powerpc/Kconfig.debug"
1223 source "security/Kconfig"
1225 source "crypto/Kconfig"
1227 config PPC_LIB_RHEAP
1230 source "arch/powerpc/kvm/Kconfig"
1232 source "kernel/livepatch/Kconfig"