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_DEBUG_VIRTUAL
132 select ARCH_HAS_DEVMEM_IS_ALLOWED
133 select ARCH_HAS_DMA_SET_COHERENT_MASK
134 select ARCH_HAS_ELF_RANDOMIZE
135 select ARCH_HAS_FORTIFY_SOURCE
136 select ARCH_HAS_GCOV_PROFILE_ALL
137 select ARCH_HAS_PHYS_TO_DMA
138 select ARCH_HAS_PMEM_API if PPC64
139 select ARCH_HAS_PTE_SPECIAL
140 select ARCH_HAS_MEMBARRIER_CALLBACKS
141 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC64
142 select ARCH_HAS_SG_CHAIN
143 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION)
144 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
145 select ARCH_HAS_UACCESS_FLUSHCACHE if PPC64
146 select ARCH_HAS_UBSAN_SANITIZE_ALL
147 select ARCH_HAS_ZONE_DEVICE if PPC_BOOK3S_64
148 select ARCH_HAVE_NMI_SAFE_CMPXCHG
149 select ARCH_MIGHT_HAVE_PC_PARPORT
150 select ARCH_MIGHT_HAVE_PC_SERIO
151 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
152 select ARCH_SUPPORTS_ATOMIC_RMW
153 select ARCH_USE_BUILTIN_BSWAP
154 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
155 select ARCH_WANT_IPC_PARSE_VERSION
156 select ARCH_WEAK_RELEASE_ACQUIRE
158 select BUILDTIME_EXTABLE_SORT
159 select CLONE_BACKWARDS
160 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
161 select DYNAMIC_FTRACE if FUNCTION_TRACER
162 select EDAC_ATOMIC_SCRUB
164 select GENERIC_ATOMIC64 if PPC32
165 select GENERIC_CLOCKEVENTS
166 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
167 select GENERIC_CMOS_UPDATE
168 select GENERIC_CPU_AUTOPROBE
169 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
170 select GENERIC_IRQ_SHOW
171 select GENERIC_IRQ_SHOW_LEVEL
172 select GENERIC_SMP_IDLE_THREAD
173 select GENERIC_STRNCPY_FROM_USER
174 select GENERIC_STRNLEN_USER
175 select GENERIC_TIME_VSYSCALL
176 select HAVE_ARCH_AUDITSYSCALL
177 select HAVE_ARCH_JUMP_LABEL
178 select HAVE_ARCH_KGDB
179 select HAVE_ARCH_MMAP_RND_BITS
180 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
181 select HAVE_ARCH_SECCOMP_FILTER
182 select HAVE_ARCH_TRACEHOOK
183 select HAVE_CBPF_JIT if !PPC64
184 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
185 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
186 select HAVE_CONTEXT_TRACKING if PPC64
187 select HAVE_DEBUG_KMEMLEAK
188 select HAVE_DEBUG_STACKOVERFLOW
189 select HAVE_DYNAMIC_FTRACE
190 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
191 select HAVE_EBPF_JIT if PPC64
192 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
193 select HAVE_FTRACE_MCOUNT_RECORD
194 select HAVE_FUNCTION_ERROR_INJECTION
195 select HAVE_FUNCTION_GRAPH_TRACER
196 select HAVE_FUNCTION_TRACER
197 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
198 select HAVE_GENERIC_GUP
199 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
201 select HAVE_IOREMAP_PROT
202 select HAVE_IRQ_EXIT_ON_IRQ_STACK
203 select HAVE_KERNEL_GZIP
204 select HAVE_KERNEL_XZ if PPC_BOOK3S
206 select HAVE_KPROBES_ON_FTRACE
207 select HAVE_KRETPROBES
208 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
209 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
210 select HAVE_MEMBLOCK_NODE_MAP
211 select HAVE_MOD_ARCH_SPECIFIC
212 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
213 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
215 select HAVE_OPTPROBES if PPC64
216 select HAVE_PERF_EVENTS
217 select HAVE_PERF_EVENTS_NMI if PPC64
218 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
219 select HAVE_PERF_REGS
220 select HAVE_PERF_USER_STACK_DUMP
221 select HAVE_RCU_TABLE_FREE if SMP
222 select HAVE_REGS_AND_STACK_ACCESS_API
223 select HAVE_RELIABLE_STACKTRACE if PPC64 && CPU_LITTLE_ENDIAN
224 select HAVE_SYSCALL_TRACEPOINTS
225 select HAVE_VIRT_CPU_ACCOUNTING
226 select HAVE_IRQ_TIME_ACCOUNTING
228 select IOMMU_HELPER if PPC64
230 select IRQ_FORCED_THREADING
231 select MODULES_USE_ELF_RELA
232 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
233 select NEED_SG_DMA_LENGTH
235 select OF_EARLY_FLATTREE
236 select OF_RESERVED_MEM
237 select OLD_SIGACTION if PPC32
238 select OLD_SIGSUSPEND
241 select SYSCTL_EXCEPTION_TRACE
242 select VIRT_TO_BUS if !PPC64
244 # Please keep this list sorted alphabetically.
247 config PPC_BARRIER_NOSPEC
250 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
266 select COMPAT_BINFMT_ELF
267 select ARCH_WANT_OLD_COMPAT_IPC
268 select COMPAT_OLD_SIGACTION
270 config SYSVIPC_COMPAT
272 depends on COMPAT && SYSVIPC
275 # All PPC32s use generic nvram driver through ppc_md
280 config SCHED_OMIT_FRAME_POINTER
284 config ARCH_MAY_HAVE_PC_FDC
288 config PPC_UDBG_16550
291 config GENERIC_TBSYNC
293 default y if PPC32 && SMP
304 config SYS_SUPPORTS_APM_EMULATION
305 default y if PMAC_APM_EMU
311 Used to allow a board to specify it wants an ePAPR compliant wrapper.
313 config DEFAULT_UIMAGE
316 Used to allow a board to specify it wants a uImage built by default
318 config ARCH_HIBERNATION_POSSIBLE
322 config ARCH_SUSPEND_POSSIBLE
324 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
325 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
328 config PPC_DCR_NATIVE
336 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
339 config PPC_OF_PLATFORM_PCI
342 depends on PPC64 # not supported on 32 bits yet
344 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
345 depends on PPC32 || PPC_BOOK3S_64
348 config ARCH_SUPPORTS_UPROBES
351 config PPC_ADV_DEBUG_REGS
353 depends on 40x || BOOKE
356 config PPC_ADV_DEBUG_IACS
358 depends on PPC_ADV_DEBUG_REGS
362 config PPC_ADV_DEBUG_DACS
364 depends on PPC_ADV_DEBUG_REGS
367 config PPC_ADV_DEBUG_DVCS
369 depends on PPC_ADV_DEBUG_REGS
373 config PPC_ADV_DEBUG_DAC_RANGE
375 depends on PPC_ADV_DEBUG_REGS && 44x
380 default y if PPC_BOOK3E_64
382 config PGTABLE_LEVELS
385 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
388 source "arch/powerpc/sysdev/Kconfig"
389 source "arch/powerpc/platforms/Kconfig"
391 menu "Kernel options"
394 bool "High memory support"
397 source kernel/Kconfig.hz
399 config HUGETLB_PAGE_SIZE_VARIABLE
401 depends on HUGETLB_PAGE
404 config MATH_EMULATION
405 bool "Math emulation"
406 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
408 Some PowerPC chips designed for embedded applications do not have
409 a floating-point unit and therefore do not implement the
410 floating-point instructions in the PowerPC instruction set. If you
411 say Y here, the kernel will include code to emulate a floating-point
412 unit, which will allow programs that use floating-point
415 This is also useful to emulate missing (optional) instructions
416 such as fsqrt on cores that do have an FPU but do not implement
417 them (such as Freescale BookE).
420 prompt "Math emulation options"
421 default MATH_EMULATION_FULL
422 depends on MATH_EMULATION
424 config MATH_EMULATION_FULL
425 bool "Emulate all the floating point instructions"
427 Select this option will enable the kernel to support to emulate
428 all the floating point instructions. If your SoC doesn't have
429 a FPU, you should select this.
431 config MATH_EMULATION_HW_UNIMPLEMENTED
432 bool "Just emulate the FPU unimplemented instructions"
434 Select this if you know there does have a hardware FPU on your
435 SoC, but some floating point instructions are not implemented by that.
439 config PPC_TRANSACTIONAL_MEM
440 bool "Transactional Memory support for POWERPC"
441 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
452 Very large kernels can cause linker branch stubs to be generated by
453 code in head_64.S, which moves the head text sections out of their
454 specified location. This option can work around the problem.
458 config MPROFILE_KERNEL
459 depends on PPC64 && CPU_LITTLE_ENDIAN
460 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
463 bool "Support for enabling/disabling CPUs"
464 depends on SMP && (PPC_PSERIES || \
465 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
467 Say Y here to be able to disable and re-enable individual
468 CPUs at runtime on SMP machines.
470 Say N if you are unsure.
472 config ARCH_CPU_PROBE_RELEASE
474 depends on HOTPLUG_CPU
476 config ARCH_ENABLE_MEMORY_HOTPLUG
479 config ARCH_HAS_WALK_MEMORY
482 config ARCH_ENABLE_MEMORY_HOTREMOVE
485 config PPC64_SUPPORTS_MEMORY_FAILURE
486 bool "Add support for memory hwpoison"
487 depends on PPC_BOOK3S_64
488 default "y" if PPC_POWERNV
489 select ARCH_SUPPORTS_MEMORY_FAILURE
492 bool "kexec system call"
493 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
496 kexec is a system call that implements the ability to shutdown your
497 current kernel, and to start another kernel. It is like a reboot
498 but it is independent of the system firmware. And like a reboot
499 you can start any kernel with it, not just Linux.
501 The name comes from the similarity to the exec system call.
503 It is an ongoing process to be certain the hardware in a machine
504 is properly shutdown, so do not be surprised if this code does not
505 initially work for you. As of this writing the exact hardware
506 interface is strongly in flux, so no good recommendation can be
510 bool "kexec file based system call"
512 select HAVE_IMA_KEXEC
516 depends on CRYPTO_SHA256=y
518 This is a new version of the kexec system call. This call is
519 file based and takes in file descriptors as system call arguments
520 for kernel and initramfs as opposed to a list of segments as is the
521 case for the older kexec call.
523 config ARCH_HAS_KEXEC_PURGATORY
527 bool "Build a relocatable kernel"
528 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
529 select NONSTATIC_KERNEL
530 select MODULE_REL_CRCS if MODVERSIONS
532 This builds a kernel image that is capable of running at the
533 location the kernel is loaded at. For ppc32, there is no any
534 alignment restrictions, and this feature is a superset of
535 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
536 16k-aligned base address. The kernel is linked as a
537 position-independent executable (PIE) and contains dynamic relocations
538 which are processed early in the bootup process.
540 One use is for the kexec on panic case where the recovery kernel
541 must live at a different physical address than the primary
544 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
545 it has been loaded at and the compile time physical addresses
546 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
547 setting can still be useful to bootwrappers that need to know the
548 load address of the kernel (eg. u-boot/mkimage).
550 config RELOCATABLE_TEST
551 bool "Test relocatable kernel"
552 depends on (PPC64 && RELOCATABLE)
554 This runs the relocatable kernel at the address it was initially
555 loaded at, which tends to be non-zero and therefore test the
559 bool "Build a dump capture kernel"
560 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
561 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
563 Build a kernel suitable for use as a dump capture kernel.
564 The same kernel binary can be used as production kernel and dump
568 bool "Firmware-assisted dump"
569 depends on PPC64 && PPC_RTAS
573 A robust mechanism to get reliable kernel crash dump with
574 assistance from firmware. This approach does not use kexec,
575 instead firmware assists in booting the capture kernel
576 while preserving memory contents. Firmware-assisted dump
577 is meant to be a kdump replacement offering robustness and
578 speed not possible without system firmware assistance.
583 bool "Distribute interrupts on all CPUs by default"
586 This option gives the kernel permission to distribute IRQs across
587 multiple CPUs. Saying N here will route all IRQs to the first
588 CPU. Generally saying Y is safe, although some problems have been
589 reported with SMP Power Macintoshes with this option enabled.
594 default y if SMP && PPC_PSERIES
600 depends on NEED_MULTIPLE_NODES
602 config USE_PERCPU_NUMA_NODE_ID
606 config HAVE_MEMORYLESS_NODES
610 config ARCH_SELECT_MEMORY_MODEL
614 config ARCH_FLATMEM_ENABLE
616 depends on (PPC64 && !NUMA) || PPC32
618 config ARCH_SPARSEMEM_ENABLE
621 select SPARSEMEM_VMEMMAP_ENABLE
623 config ARCH_SPARSEMEM_DEFAULT
625 depends on PPC_BOOK3S_64
627 config SYS_SUPPORTS_HUGETLBFS
630 config ILLEGAL_POINTER_VALUE
632 # This is roughly half way between the top of user space and the bottom
633 # of kernel space, which seems about as good as we can get.
634 default 0x5deadbeef0000000 if PPC64
637 config ARCH_MEMORY_PROBE
639 depends on MEMORY_HOTPLUG
641 # Some NUMA nodes have memory ranges that span
642 # other nodes. Even though a pfn is valid and
643 # between a node's start and end pfns, it may not
644 # reside on that node. See memmap_init_zone()
646 config NODES_SPAN_OTHER_NODES
648 depends on NEED_MULTIPLE_NODES
651 bool "Using standard binutils settings"
655 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
656 Note, that kernel will be able to run only those applications,
657 which had been compiled using binutils later than 2.17.50.0.3 with
658 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
659 the older binutils, you can patch them with a trivial patch, which
660 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
666 Select the kernel logical page size. Increasing the page size
667 will reduce software overhead at each page boundary, allow
668 hardware prefetch mechanisms to be more effective, and allow
669 larger dma transfers increasing IO efficiency and reducing
670 overhead. However the utilization of memory will increase.
671 For example, each cached file will using a multiple of the
672 page size to hold its contents and the difference between the
673 end of file and the end of page is wasted.
675 Some dedicated systems, such as software raid serving with
676 accelerated calculations, have shown significant increases.
678 If you configure a 64 bit kernel for 64k pages but the
679 processor does not support them, then the kernel will simulate
680 them with 4k pages, loading them on demand, but with the
681 reduced software overhead and larger internal fragmentation.
682 For the 32 bit kernel, a large page option will not be offered
683 unless it is supported by the configured processor.
685 If unsure, choose 4K_PAGES.
689 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
693 depends on 44x || PPC_8xx
697 depends on !PPC_FSL_BOOK3E && (44x || PPC_BOOK3S_64 || PPC_BOOK3E_64)
698 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
700 config PPC_256K_PAGES
701 bool "256k page size"
702 depends on 44x && !STDBINUTILS
704 Make the page size 256k.
706 As the ELF standard only requires alignment to support page
707 sizes up to 64k, you will need to compile all of your user
708 space applications with a non-standard binutils settings
709 (see the STDBINUTILS description for details).
711 Say N unless you know what you are doing.
716 int "Thread shift" if EXPERT
718 default "15" if PPC_256K_PAGES
719 default "14" if PPC64
722 Used to define the stack size. The default is almost always what you
723 want. Only change this if you know what you are doing.
725 config FORCE_MAX_ZONEORDER
726 int "Maximum zone order"
727 range 8 9 if PPC64 && PPC_64K_PAGES
728 default "9" if PPC64 && PPC_64K_PAGES
729 range 13 13 if PPC64 && !PPC_64K_PAGES
730 default "13" if PPC64 && !PPC_64K_PAGES
731 range 9 64 if PPC32 && PPC_16K_PAGES
732 default "9" if PPC32 && PPC_16K_PAGES
733 range 7 64 if PPC32 && PPC_64K_PAGES
734 default "7" if PPC32 && PPC_64K_PAGES
735 range 5 64 if PPC32 && PPC_256K_PAGES
736 default "5" if PPC32 && PPC_256K_PAGES
740 The kernel memory allocator divides physically contiguous memory
741 blocks into "zones", where each zone is a power of two number of
742 pages. This option selects the largest power of two that the kernel
743 keeps in the memory allocator. If you need to allocate very large
744 blocks of physically contiguous memory, then you may need to
747 This config option is actually maximum order plus one. For example,
748 a value of 11 means that the largest free memory block is 2^10 pages.
750 The page size is not necessarily 4KB. For example, on 64-bit
751 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
752 this in mind when choosing a value for this option.
754 config PPC_SUBPAGE_PROT
755 bool "Support setting protections for 4k subpages"
756 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
758 This option adds support for a system call to allow user programs
759 to set access permissions (read/write, readonly, or no access)
760 on the 4k subpages of each 64k page.
762 config PPC_COPRO_BASE
766 bool "SMT (Hyperthreading) scheduler support"
767 depends on PPC64 && SMP
769 SMT scheduler support improves the CPU scheduler's decision making
770 when dealing with POWER5 cpus at a cost of slightly increased
771 overhead in some places. If unsure say N here.
773 config PPC_DENORMALISATION
774 bool "PowerPC denormalisation exception handling"
775 depends on PPC_BOOK3S_64
776 default "y" if PPC_POWERNV
778 Add support for handling denormalisation of single precision
779 values. Useful for bare metal only. If unsure say Y here.
782 bool "Default bootloader kernel arguments"
785 string "Initial kernel command string"
786 depends on CMDLINE_BOOL
787 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
789 On some platforms, there is currently no way for the boot loader to
790 pass arguments to the kernel. For these platforms, you can supply
791 some command-line options at build time by entering them here. In
792 most cases you will need to specify the root device here.
795 bool "Always use the default kernel command string"
796 depends on CMDLINE_BOOL
798 Always use the default kernel command string, even if the boot
799 loader passes other arguments to the kernel.
800 This is useful if you cannot or don't want to change the
801 command-line options your boot loader passes to the kernel.
804 string "Additional default image types"
806 List additional targets to be built by the bootwrapper here (separated
807 by spaces). This is useful for targets that depend of device tree
808 files in the .dts directory.
810 Targets in this list will be build as part of the default build
811 target, or when the user does a 'make zImage' or a
812 'make zImage.initrd'.
814 If unsure, leave blank
816 config ARCH_WANTS_FREEZER_CONTROL
820 source kernel/power/Kconfig
823 bool "Enable seccomp to safely compute untrusted bytecode"
827 This kernel feature is useful for number crunching applications
828 that may need to compute untrusted bytecode during their
829 execution. By using pipes or other transports made available to
830 the process as file descriptors supporting the read/write
831 syscalls, it's possible to isolate those applications in
832 their own address space using seccomp. Once seccomp is
833 enabled via /proc/<pid>/seccomp, it cannot be disabled
834 and the task is only allowed to execute a few safe syscalls
835 defined by each seccomp mode.
837 If unsure, say Y. Only embedded should say N here.
840 prompt "PowerPC Memory Protection Keys"
842 depends on PPC_BOOK3S_64
843 select ARCH_USES_HIGH_VMA_FLAGS
844 select ARCH_HAS_PKEYS
846 Memory Protection Keys provides a mechanism for enforcing
847 page-based protections, but without requiring modification of the
848 page tables when an application changes protection domains.
850 For details, see Documentation/vm/protection-keys.rst
863 bool "Support for ISA-bus hardware"
867 Find out whether you have ISA slots on your motherboard. ISA is the
868 name of a bus system, i.e. the way the CPU talks to the other stuff
869 inside your box. If you have an Apple machine, say N here; if you
870 have an IBM RS/6000 or pSeries machine, say Y. If you have an
871 embedded board, consult your board documentation.
873 config GENERIC_ISA_DMA
875 depends on ISA_DMA_API
878 config PPC_INDIRECT_PCI
881 default y if 40x || 44x
894 select PPC_INDIRECT_PCI
900 depends on SUSPEND && (PPC_85xx || PPC_86xx)
902 Freescale MPC85xx/MPC86xx power management controller support
903 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
908 depends on SUSPEND && (44x || 40x)
910 PPC4xx Clock Power Management (CPM) support (suspend/resume).
911 It also enables support for two different idle states (idle-wait
918 bool "Freescale Local Bus support"
920 Enables reporting of errors from the Freescale local bus
921 controller. Also contains some common code used by
922 drivers for specific local bus peripherals.
926 depends on PPC_83xx || QUICC_ENGINE || CPM2
928 Freescale General-purpose Timers support
930 # Platforms that what PCI turned unconditionally just do select PCI
931 # in their config node. Platforms that want to choose at config
932 # time should select PPC_PCI_CHOICE
933 config PPC_PCI_CHOICE
937 bool "PCI support" if PPC_PCI_CHOICE
938 default y if !40x && !CPM2 && !PPC_8xx && !PPC_83xx \
939 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
940 select GENERIC_PCI_IOMAP
942 Find out whether your system includes a PCI bus. PCI is the name of
943 a bus system, i.e. the way the CPU talks to the other stuff inside
944 your box. If you say Y here, the kernel will include drivers and
945 infrastructure code to support PCI bus devices.
955 depends on PCI && 8260
956 select PPC_INDIRECT_PCI
959 source "drivers/pci/Kconfig"
961 source "drivers/pcmcia/Kconfig"
967 tristate "RapidIO support"
968 depends on HAS_RAPIDIO || PCI
970 If you say Y here, the kernel will include drivers and
971 infrastructure code to support RapidIO interconnect devices.
974 bool "Freescale Embedded SRIO Controller support"
975 depends on RAPIDIO = y && HAS_RAPIDIO
978 Include support for RapidIO controller on Freescale embedded
979 processors (MPC8548, MPC8641, etc).
981 source "drivers/rapidio/Kconfig"
985 config NONSTATIC_KERNEL
988 menu "Advanced setup"
991 config ADVANCED_OPTIONS
992 bool "Prompt for advanced kernel configuration options"
994 This option will enable prompting for a variety of advanced kernel
995 configuration options. These options can cause the kernel to not
996 work if they are set incorrectly, but can be used to optimize certain
997 aspects of kernel memory management.
999 Unless you know what you are doing, say N here.
1001 comment "Default settings for advanced configuration options are used"
1002 depends on !ADVANCED_OPTIONS
1004 config LOWMEM_SIZE_BOOL
1005 bool "Set maximum low memory"
1006 depends on ADVANCED_OPTIONS
1008 This option allows you to set the maximum amount of memory which
1009 will be used as "low memory", that is, memory which the kernel can
1010 access directly, without having to set up a kernel virtual mapping.
1011 This can be useful in optimizing the layout of kernel virtual
1014 Say N here unless you know what you are doing.
1017 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1018 default "0x30000000"
1020 config LOWMEM_CAM_NUM_BOOL
1021 bool "Set number of CAMs to use to map low memory"
1022 depends on ADVANCED_OPTIONS && FSL_BOOKE
1024 This option allows you to set the maximum number of CAM slots that
1025 will be used to map low memory. There are a limited number of slots
1026 available and even more limited number that will fit in the L1 MMU.
1027 However, using more entries will allow mapping more low memory. This
1028 can be useful in optimizing the layout of kernel virtual memory.
1030 Say N here unless you know what you are doing.
1032 config LOWMEM_CAM_NUM
1033 depends on FSL_BOOKE
1034 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1037 config DYNAMIC_MEMSTART
1038 bool "Enable page aligned dynamic load address for kernel"
1039 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1040 select NONSTATIC_KERNEL
1042 This option enables the kernel to be loaded at any page aligned
1043 physical address. The kernel creates a mapping from KERNELBASE to
1044 the address where the kernel is loaded. The page size here implies
1045 the TLB page size of the mapping for kernel on the particular platform.
1046 Please refer to the init code for finding the TLB page size.
1048 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1049 kernel image, where the only restriction is the page aligned kernel
1050 load address. When this option is enabled, the compile time physical
1051 address CONFIG_PHYSICAL_START is ignored.
1053 This option is overridden by CONFIG_RELOCATABLE
1055 config PAGE_OFFSET_BOOL
1056 bool "Set custom page offset address"
1057 depends on ADVANCED_OPTIONS
1059 This option allows you to set the kernel virtual address at which
1060 the kernel will map low memory. This can be useful in optimizing
1061 the virtual memory layout of the system.
1063 Say N here unless you know what you are doing.
1066 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1067 default "0xc0000000"
1069 config KERNEL_START_BOOL
1070 bool "Set custom kernel base address"
1071 depends on ADVANCED_OPTIONS
1073 This option allows you to set the kernel virtual address at which
1074 the kernel will be loaded. Normally this should match PAGE_OFFSET
1075 however there are times (like kdump) that one might not want them
1078 Say N here unless you know what you are doing.
1081 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1082 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1083 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1084 default "0xc0000000"
1086 config PHYSICAL_START_BOOL
1087 bool "Set physical address where the kernel is loaded"
1088 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1090 This gives the physical address where the kernel is loaded.
1092 Say N here unless you know what you are doing.
1094 config PHYSICAL_START
1095 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1096 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1097 default "0x00000000"
1099 config PHYSICAL_ALIGN
1101 default "0x04000000" if FSL_BOOKE
1103 This value puts the alignment restrictions on physical address
1104 where kernel is loaded and run from. Kernel is compiled for an
1105 address which meets above alignment restriction.
1107 config TASK_SIZE_BOOL
1108 bool "Set custom user task size"
1109 depends on ADVANCED_OPTIONS
1111 This option allows you to set the amount of virtual address space
1112 allocated to user tasks. This can be useful in optimizing the
1113 virtual memory layout of the system.
1115 Say N here unless you know what you are doing.
1118 hex "Size of user task space" if TASK_SIZE_BOOL
1119 default "0x80000000" if PPC_8xx
1120 default "0xc0000000"
1122 config CONSISTENT_SIZE_BOOL
1123 bool "Set custom consistent memory pool size"
1124 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1126 This option allows you to set the size of the
1127 consistent memory pool. This pool of virtual memory
1128 is used to make consistent memory allocations.
1130 config CONSISTENT_SIZE
1131 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1132 default "0x00200000" if NOT_COHERENT_CACHE
1135 bool "Pinned Kernel TLBs (860 ONLY)"
1136 depends on ADVANCED_OPTIONS && PPC_8xx && \
1137 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1140 bool "Pinned TLB for DATA"
1145 bool "Pinned TLB for IMMR"
1146 depends on PIN_TLB || PPC_EARLY_DEBUG_CPM
1150 bool "Pinned TLB for TEXT"
1156 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1159 default "0xc000000000000000"
1162 default "0xc000000000000000"
1163 config PHYSICAL_START
1165 default "0x00000000"
1171 config PPC_LIB_RHEAP
1174 source "arch/powerpc/kvm/Kconfig"
1176 source "kernel/livepatch/Kconfig"