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 if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
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 "arch/powerpc/sysdev/Kconfig"
387 source "arch/powerpc/platforms/Kconfig"
389 menu "Kernel options"
392 bool "High memory support"
395 source kernel/Kconfig.hz
396 source kernel/Kconfig.preempt
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 MPROFILE_KERNEL
460 depends on PPC64 && CPU_LITTLE_ENDIAN
461 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
464 bool "Support for enabling/disabling CPUs"
465 depends on SMP && (PPC_PSERIES || \
466 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
468 Say Y here to be able to disable and re-enable individual
469 CPUs at runtime on SMP machines.
471 Say N if you are unsure.
473 config ARCH_CPU_PROBE_RELEASE
475 depends on HOTPLUG_CPU
477 config ARCH_ENABLE_MEMORY_HOTPLUG
480 config ARCH_HAS_WALK_MEMORY
483 config ARCH_ENABLE_MEMORY_HOTREMOVE
486 config PPC64_SUPPORTS_MEMORY_FAILURE
487 bool "Add support for memory hwpoison"
488 depends on PPC_BOOK3S_64
489 default "y" if PPC_POWERNV
490 select ARCH_SUPPORTS_MEMORY_FAILURE
493 bool "kexec system call"
494 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
497 kexec is a system call that implements the ability to shutdown your
498 current kernel, and to start another kernel. It is like a reboot
499 but it is independent of the system firmware. And like a reboot
500 you can start any kernel with it, not just Linux.
502 The name comes from the similarity to the exec system call.
504 It is an ongoing process to be certain the hardware in a machine
505 is properly shutdown, so do not be surprised if this code does not
506 initially work for you. As of this writing the exact hardware
507 interface is strongly in flux, so no good recommendation can be
511 bool "kexec file based system call"
513 select HAVE_IMA_KEXEC
517 depends on CRYPTO_SHA256=y
519 This is a new version of the kexec system call. This call is
520 file based and takes in file descriptors as system call arguments
521 for kernel and initramfs as opposed to a list of segments as is the
522 case for the older kexec call.
524 config ARCH_HAS_KEXEC_PURGATORY
528 bool "Build a relocatable kernel"
529 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
530 select NONSTATIC_KERNEL
531 select MODULE_REL_CRCS if MODVERSIONS
533 This builds a kernel image that is capable of running at the
534 location the kernel is loaded at. For ppc32, there is no any
535 alignment restrictions, and this feature is a superset of
536 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
537 16k-aligned base address. The kernel is linked as a
538 position-independent executable (PIE) and contains dynamic relocations
539 which are processed early in the bootup process.
541 One use is for the kexec on panic case where the recovery kernel
542 must live at a different physical address than the primary
545 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
546 it has been loaded at and the compile time physical addresses
547 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
548 setting can still be useful to bootwrappers that need to know the
549 load address of the kernel (eg. u-boot/mkimage).
551 config RELOCATABLE_TEST
552 bool "Test relocatable kernel"
553 depends on (PPC64 && RELOCATABLE)
556 This runs the relocatable kernel at the address it was initially
557 loaded at, which tends to be non-zero and therefore test the
561 bool "Build a dump capture kernel"
562 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
563 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
565 Build a kernel suitable for use as a dump capture kernel.
566 The same kernel binary can be used as production kernel and dump
570 bool "Firmware-assisted dump"
571 depends on PPC64 && PPC_RTAS
575 A robust mechanism to get reliable kernel crash dump with
576 assistance from firmware. This approach does not use kexec,
577 instead firmware assists in booting the capture kernel
578 while preserving memory contents. Firmware-assisted dump
579 is meant to be a kdump replacement offering robustness and
580 speed not possible without system firmware assistance.
585 bool "Distribute interrupts on all CPUs by default"
588 This option gives the kernel permission to distribute IRQs across
589 multiple CPUs. Saying N here will route all IRQs to the first
590 CPU. Generally saying Y is safe, although some problems have been
591 reported with SMP Power Macintoshes with this option enabled.
596 default y if SMP && PPC_PSERIES
602 depends on NEED_MULTIPLE_NODES
604 config USE_PERCPU_NUMA_NODE_ID
608 config HAVE_MEMORYLESS_NODES
612 config ARCH_SELECT_MEMORY_MODEL
616 config ARCH_FLATMEM_ENABLE
618 depends on (PPC64 && !NUMA) || PPC32
620 config ARCH_SPARSEMEM_ENABLE
623 select SPARSEMEM_VMEMMAP_ENABLE
625 config ARCH_SPARSEMEM_DEFAULT
627 depends on PPC_BOOK3S_64
629 config SYS_SUPPORTS_HUGETLBFS
632 config ILLEGAL_POINTER_VALUE
634 # This is roughly half way between the top of user space and the bottom
635 # of kernel space, which seems about as good as we can get.
636 default 0x5deadbeef0000000 if PPC64
639 config ARCH_MEMORY_PROBE
641 depends on MEMORY_HOTPLUG
643 # Some NUMA nodes have memory ranges that span
644 # other nodes. Even though a pfn is valid and
645 # between a node's start and end pfns, it may not
646 # reside on that node. See memmap_init_zone()
648 config NODES_SPAN_OTHER_NODES
650 depends on NEED_MULTIPLE_NODES
653 bool "Using standard binutils settings"
657 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
658 Note, that kernel will be able to run only those applications,
659 which had been compiled using binutils later than 2.17.50.0.3 with
660 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
661 the older binutils, you can patch them with a trivial patch, which
662 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
668 Select the kernel logical page size. Increasing the page size
669 will reduce software overhead at each page boundary, allow
670 hardware prefetch mechanisms to be more effective, and allow
671 larger dma transfers increasing IO efficiency and reducing
672 overhead. However the utilization of memory will increase.
673 For example, each cached file will using a multiple of the
674 page size to hold its contents and the difference between the
675 end of file and the end of page is wasted.
677 Some dedicated systems, such as software raid serving with
678 accelerated calculations, have shown significant increases.
680 If you configure a 64 bit kernel for 64k pages but the
681 processor does not support them, then the kernel will simulate
682 them with 4k pages, loading them on demand, but with the
683 reduced software overhead and larger internal fragmentation.
684 For the 32 bit kernel, a large page option will not be offered
685 unless it is supported by the configured processor.
687 If unsure, choose 4K_PAGES.
691 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
695 depends on 44x || PPC_8xx
699 depends on !PPC_FSL_BOOK3E && (44x || PPC_BOOK3S_64 || PPC_BOOK3E_64)
700 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
702 config PPC_256K_PAGES
703 bool "256k page size"
704 depends on 44x && !STDBINUTILS
706 Make the page size 256k.
708 As the ELF standard only requires alignment to support page
709 sizes up to 64k, you will need to compile all of your user
710 space applications with a non-standard binutils settings
711 (see the STDBINUTILS description for details).
713 Say N unless you know what you are doing.
718 int "Thread shift" if EXPERT
720 default "15" if PPC_256K_PAGES
721 default "14" if PPC64
724 Used to define the stack size. The default is almost always what you
725 want. Only change this if you know what you are doing.
727 config FORCE_MAX_ZONEORDER
728 int "Maximum zone order"
729 range 8 9 if PPC64 && PPC_64K_PAGES
730 default "9" if PPC64 && PPC_64K_PAGES
731 range 13 13 if PPC64 && !PPC_64K_PAGES
732 default "13" if PPC64 && !PPC_64K_PAGES
733 range 9 64 if PPC32 && PPC_16K_PAGES
734 default "9" if PPC32 && PPC_16K_PAGES
735 range 7 64 if PPC32 && PPC_64K_PAGES
736 default "7" if PPC32 && PPC_64K_PAGES
737 range 5 64 if PPC32 && PPC_256K_PAGES
738 default "5" if PPC32 && PPC_256K_PAGES
742 The kernel memory allocator divides physically contiguous memory
743 blocks into "zones", where each zone is a power of two number of
744 pages. This option selects the largest power of two that the kernel
745 keeps in the memory allocator. If you need to allocate very large
746 blocks of physically contiguous memory, then you may need to
749 This config option is actually maximum order plus one. For example,
750 a value of 11 means that the largest free memory block is 2^10 pages.
752 The page size is not necessarily 4KB. For example, on 64-bit
753 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
754 this in mind when choosing a value for this option.
756 config PPC_SUBPAGE_PROT
757 bool "Support setting protections for 4k subpages"
758 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
760 This option adds support for a system call to allow user programs
761 to set access permissions (read/write, readonly, or no access)
762 on the 4k subpages of each 64k page.
764 config PPC_COPRO_BASE
769 bool "SMT (Hyperthreading) scheduler support"
770 depends on PPC64 && SMP
772 SMT scheduler support improves the CPU scheduler's decision making
773 when dealing with POWER5 cpus at a cost of slightly increased
774 overhead in some places. If unsure say N here.
776 config PPC_DENORMALISATION
777 bool "PowerPC denormalisation exception handling"
778 depends on PPC_BOOK3S_64
779 default "y" if PPC_POWERNV
781 Add support for handling denormalisation of single precision
782 values. Useful for bare metal only. If unsure say Y here.
785 bool "Default bootloader kernel arguments"
788 string "Initial kernel command string"
789 depends on CMDLINE_BOOL
790 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
792 On some platforms, there is currently no way for the boot loader to
793 pass arguments to the kernel. For these platforms, you can supply
794 some command-line options at build time by entering them here. In
795 most cases you will need to specify the root device here.
798 bool "Always use the default kernel command string"
799 depends on CMDLINE_BOOL
801 Always use the default kernel command string, even if the boot
802 loader passes other arguments to the kernel.
803 This is useful if you cannot or don't want to change the
804 command-line options your boot loader passes to the kernel.
807 string "Additional default image types"
809 List additional targets to be built by the bootwrapper here (separated
810 by spaces). This is useful for targets that depend of device tree
811 files in the .dts directory.
813 Targets in this list will be build as part of the default build
814 target, or when the user does a 'make zImage' or a
815 'make zImage.initrd'.
817 If unsure, leave blank
819 config ARCH_WANTS_FREEZER_CONTROL
823 source kernel/power/Kconfig
826 bool "Enable seccomp to safely compute untrusted bytecode"
830 This kernel feature is useful for number crunching applications
831 that may need to compute untrusted bytecode during their
832 execution. By using pipes or other transports made available to
833 the process as file descriptors supporting the read/write
834 syscalls, it's possible to isolate those applications in
835 their own address space using seccomp. Once seccomp is
836 enabled via /proc/<pid>/seccomp, it cannot be disabled
837 and the task is only allowed to execute a few safe syscalls
838 defined by each seccomp mode.
840 If unsure, say Y. Only embedded should say N here.
843 prompt "PowerPC Memory Protection Keys"
845 depends on PPC_BOOK3S_64
846 select ARCH_USES_HIGH_VMA_FLAGS
847 select ARCH_HAS_PKEYS
849 Memory Protection Keys provides a mechanism for enforcing
850 page-based protections, but without requiring modification of the
851 page tables when an application changes protection domains.
853 For details, see Documentation/vm/protection-keys.rst
866 bool "Support for ISA-bus hardware"
870 Find out whether you have ISA slots on your motherboard. ISA is the
871 name of a bus system, i.e. the way the CPU talks to the other stuff
872 inside your box. If you have an Apple machine, say N here; if you
873 have an IBM RS/6000 or pSeries machine, say Y. If you have an
874 embedded board, consult your board documentation.
880 config NEED_DMA_MAP_STATE
881 def_bool (PPC64 || NOT_COHERENT_CACHE)
883 config GENERIC_ISA_DMA
885 depends on ISA_DMA_API
888 config PPC_INDIRECT_PCI
891 default y if 40x || 44x
905 select PPC_INDIRECT_PCI
911 depends on SUSPEND && (PPC_85xx || PPC_86xx)
913 Freescale MPC85xx/MPC86xx power management controller support
914 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
919 depends on SUSPEND && (44x || 40x)
921 PPC4xx Clock Power Management (CPM) support (suspend/resume).
922 It also enables support for two different idle states (idle-wait
929 bool "Freescale Local Bus support"
931 Enables reporting of errors from the Freescale local bus
932 controller. Also contains some common code used by
933 drivers for specific local bus peripherals.
937 depends on PPC_83xx || QUICC_ENGINE || CPM2
939 Freescale General-purpose Timers support
941 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
945 # Platforms that what PCI turned unconditionally just do select PCI
946 # in their config node. Platforms that want to choose at config
947 # time should select PPC_PCI_CHOICE
948 config PPC_PCI_CHOICE
952 bool "PCI support" if PPC_PCI_CHOICE
953 default y if !40x && !CPM2 && !PPC_8xx && !PPC_83xx \
954 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
955 default PCI_QSPAN if PPC_8xx
956 select GENERIC_PCI_IOMAP
958 Find out whether your system includes a PCI bus. PCI is the name of
959 a bus system, i.e. the way the CPU talks to the other stuff inside
960 your box. If you say Y here, the kernel will include drivers and
961 infrastructure code to support PCI bus devices.
974 Say Y here if you have a system based on a Motorola 8xx-series
975 embedded processor with a QSPAN PCI interface, otherwise say N.
979 depends on PCI && 8260
980 select PPC_INDIRECT_PCI
983 source "drivers/pci/Kconfig"
985 source "drivers/pcmcia/Kconfig"
992 tristate "RapidIO support"
993 depends on HAS_RAPIDIO || PCI
995 If you say Y here, the kernel will include drivers and
996 infrastructure code to support RapidIO interconnect devices.
999 bool "Freescale Embedded SRIO Controller support"
1000 depends on RAPIDIO = y && HAS_RAPIDIO
1003 Include support for RapidIO controller on Freescale embedded
1004 processors (MPC8548, MPC8641, etc).
1006 source "drivers/rapidio/Kconfig"
1010 config NONSTATIC_KERNEL
1014 menu "Advanced setup"
1017 config ADVANCED_OPTIONS
1018 bool "Prompt for advanced kernel configuration options"
1020 This option will enable prompting for a variety of advanced kernel
1021 configuration options. These options can cause the kernel to not
1022 work if they are set incorrectly, but can be used to optimize certain
1023 aspects of kernel memory management.
1025 Unless you know what you are doing, say N here.
1027 comment "Default settings for advanced configuration options are used"
1028 depends on !ADVANCED_OPTIONS
1030 config LOWMEM_SIZE_BOOL
1031 bool "Set maximum low memory"
1032 depends on ADVANCED_OPTIONS
1034 This option allows you to set the maximum amount of memory which
1035 will be used as "low memory", that is, memory which the kernel can
1036 access directly, without having to set up a kernel virtual mapping.
1037 This can be useful in optimizing the layout of kernel virtual
1040 Say N here unless you know what you are doing.
1043 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1044 default "0x30000000"
1046 config LOWMEM_CAM_NUM_BOOL
1047 bool "Set number of CAMs to use to map low memory"
1048 depends on ADVANCED_OPTIONS && FSL_BOOKE
1050 This option allows you to set the maximum number of CAM slots that
1051 will be used to map low memory. There are a limited number of slots
1052 available and even more limited number that will fit in the L1 MMU.
1053 However, using more entries will allow mapping more low memory. This
1054 can be useful in optimizing the layout of kernel virtual memory.
1056 Say N here unless you know what you are doing.
1058 config LOWMEM_CAM_NUM
1059 depends on FSL_BOOKE
1060 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1063 config DYNAMIC_MEMSTART
1064 bool "Enable page aligned dynamic load address for kernel"
1065 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1066 select NONSTATIC_KERNEL
1068 This option enables the kernel to be loaded at any page aligned
1069 physical address. The kernel creates a mapping from KERNELBASE to
1070 the address where the kernel is loaded. The page size here implies
1071 the TLB page size of the mapping for kernel on the particular platform.
1072 Please refer to the init code for finding the TLB page size.
1074 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1075 kernel image, where the only restriction is the page aligned kernel
1076 load address. When this option is enabled, the compile time physical
1077 address CONFIG_PHYSICAL_START is ignored.
1079 This option is overridden by CONFIG_RELOCATABLE
1081 config PAGE_OFFSET_BOOL
1082 bool "Set custom page offset address"
1083 depends on ADVANCED_OPTIONS
1085 This option allows you to set the kernel virtual address at which
1086 the kernel will map low memory. This can be useful in optimizing
1087 the virtual memory layout of the system.
1089 Say N here unless you know what you are doing.
1092 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1093 default "0xc0000000"
1095 config KERNEL_START_BOOL
1096 bool "Set custom kernel base address"
1097 depends on ADVANCED_OPTIONS
1099 This option allows you to set the kernel virtual address at which
1100 the kernel will be loaded. Normally this should match PAGE_OFFSET
1101 however there are times (like kdump) that one might not want them
1104 Say N here unless you know what you are doing.
1107 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1108 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1109 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1110 default "0xc0000000"
1112 config PHYSICAL_START_BOOL
1113 bool "Set physical address where the kernel is loaded"
1114 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1116 This gives the physical address where the kernel is loaded.
1118 Say N here unless you know what you are doing.
1120 config PHYSICAL_START
1121 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1122 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1123 default "0x00000000"
1125 config PHYSICAL_ALIGN
1127 default "0x04000000" if FSL_BOOKE
1129 This value puts the alignment restrictions on physical address
1130 where kernel is loaded and run from. Kernel is compiled for an
1131 address which meets above alignment restriction.
1133 config TASK_SIZE_BOOL
1134 bool "Set custom user task size"
1135 depends on ADVANCED_OPTIONS
1137 This option allows you to set the amount of virtual address space
1138 allocated to user tasks. This can be useful in optimizing the
1139 virtual memory layout of the system.
1141 Say N here unless you know what you are doing.
1144 hex "Size of user task space" if TASK_SIZE_BOOL
1145 default "0x80000000" if PPC_8xx
1146 default "0xc0000000"
1148 config CONSISTENT_SIZE_BOOL
1149 bool "Set custom consistent memory pool size"
1150 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1152 This option allows you to set the size of the
1153 consistent memory pool. This pool of virtual memory
1154 is used to make consistent memory allocations.
1156 config CONSISTENT_SIZE
1157 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1158 default "0x00200000" if NOT_COHERENT_CACHE
1161 bool "Pinned Kernel TLBs (860 ONLY)"
1162 depends on ADVANCED_OPTIONS && PPC_8xx && \
1163 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1166 bool "Pinned TLB for DATA"
1171 bool "Pinned TLB for IMMR"
1176 bool "Pinned TLB for TEXT"
1182 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1185 default "0xc000000000000000"
1188 default "0xc000000000000000"
1189 config PHYSICAL_START
1191 default "0x00000000"
1197 config PPC_LIB_RHEAP
1200 source "arch/powerpc/kvm/Kconfig"
1202 source "kernel/livepatch/Kconfig"