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 (PPC32 && !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_WANT_IRQS_OFF_ACTIVATE_MM
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 $(cc-option,-mstack-protector-guard=tls) && PPC32
185 select HAVE_CONTEXT_TRACKING if PPC64
186 select HAVE_DEBUG_KMEMLEAK
187 select HAVE_DEBUG_STACKOVERFLOW
188 select HAVE_DYNAMIC_FTRACE
189 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
190 select HAVE_EBPF_JIT if PPC64
191 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
192 select HAVE_FTRACE_MCOUNT_RECORD
193 select HAVE_FUNCTION_GRAPH_TRACER
194 select HAVE_FUNCTION_TRACER
195 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
196 select HAVE_GENERIC_GUP
197 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
199 select HAVE_IOREMAP_PROT
200 select HAVE_IRQ_EXIT_ON_IRQ_STACK
201 select HAVE_KERNEL_GZIP
202 select HAVE_KERNEL_XZ if PPC_BOOK3S
204 select HAVE_KPROBES_ON_FTRACE
205 select HAVE_KRETPROBES
206 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
207 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
209 select HAVE_MEMBLOCK_NODE_MAP
210 select HAVE_MOD_ARCH_SPECIFIC
211 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
212 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC64 && PPC_BOOK3S && SMP
214 select HAVE_OPTPROBES if PPC64
215 select HAVE_PERF_EVENTS
216 select HAVE_PERF_EVENTS_NMI if PPC64
217 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
218 select HAVE_PERF_REGS
219 select HAVE_PERF_USER_STACK_DUMP
220 select HAVE_RCU_TABLE_FREE if SMP
221 select HAVE_REGS_AND_STACK_ACCESS_API
222 select HAVE_RELIABLE_STACKTRACE if PPC64 && CPU_LITTLE_ENDIAN
223 select HAVE_SYSCALL_TRACEPOINTS
224 select HAVE_VIRT_CPU_ACCOUNTING
225 select HAVE_IRQ_TIME_ACCOUNTING
227 select IOMMU_HELPER if PPC64
229 select IRQ_FORCED_THREADING
230 select MODULES_USE_ELF_RELA
231 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
232 select NEED_SG_DMA_LENGTH
235 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
236 select OF_EARLY_FLATTREE
237 select OF_RESERVED_MEM
238 select OLD_SIGACTION if PPC32
239 select OLD_SIGSUSPEND
242 select SYSCTL_EXCEPTION_TRACE
243 select VIRT_TO_BUS if !PPC64
245 # Please keep this list sorted alphabetically.
248 config PPC_BARRIER_NOSPEC
251 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
267 select COMPAT_BINFMT_ELF
268 select ARCH_WANT_OLD_COMPAT_IPC
269 select COMPAT_OLD_SIGACTION
271 config SYSVIPC_COMPAT
273 depends on COMPAT && SYSVIPC
276 # All PPC32s use generic nvram driver through ppc_md
281 config SCHED_OMIT_FRAME_POINTER
285 config ARCH_MAY_HAVE_PC_FDC
289 config PPC_UDBG_16550
293 config GENERIC_TBSYNC
295 default y if PPC32 && SMP
307 config SYS_SUPPORTS_APM_EMULATION
308 default y if PMAC_APM_EMU
314 Used to allow a board to specify it wants an ePAPR compliant wrapper.
317 config DEFAULT_UIMAGE
320 Used to allow a board to specify it wants a uImage built by default
323 config ARCH_HIBERNATION_POSSIBLE
327 config ARCH_SUSPEND_POSSIBLE
329 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
330 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
333 config PPC_DCR_NATIVE
343 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
346 config PPC_OF_PLATFORM_PCI
349 depends on PPC64 # not supported on 32 bits yet
352 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
353 depends on PPC32 || PPC_BOOK3S_64
356 config ARCH_SUPPORTS_UPROBES
359 config PPC_ADV_DEBUG_REGS
361 depends on 40x || BOOKE
364 config PPC_ADV_DEBUG_IACS
366 depends on PPC_ADV_DEBUG_REGS
370 config PPC_ADV_DEBUG_DACS
372 depends on PPC_ADV_DEBUG_REGS
375 config PPC_ADV_DEBUG_DVCS
377 depends on PPC_ADV_DEBUG_REGS
381 config PPC_ADV_DEBUG_DAC_RANGE
383 depends on PPC_ADV_DEBUG_REGS && 44x
390 config PGTABLE_LEVELS
393 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
396 source "arch/powerpc/sysdev/Kconfig"
397 source "arch/powerpc/platforms/Kconfig"
399 menu "Kernel options"
402 bool "High memory support"
405 source kernel/Kconfig.hz
407 config HUGETLB_PAGE_SIZE_VARIABLE
409 depends on HUGETLB_PAGE
412 config MATH_EMULATION
413 bool "Math emulation"
414 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
416 Some PowerPC chips designed for embedded applications do not have
417 a floating-point unit and therefore do not implement the
418 floating-point instructions in the PowerPC instruction set. If you
419 say Y here, the kernel will include code to emulate a floating-point
420 unit, which will allow programs that use floating-point
423 This is also useful to emulate missing (optional) instructions
424 such as fsqrt on cores that do have an FPU but do not implement
425 them (such as Freescale BookE).
428 prompt "Math emulation options"
429 default MATH_EMULATION_FULL
430 depends on MATH_EMULATION
432 config MATH_EMULATION_FULL
433 bool "Emulate all the floating point instructions"
435 Select this option will enable the kernel to support to emulate
436 all the floating point instructions. If your SoC doesn't have
437 a FPU, you should select this.
439 config MATH_EMULATION_HW_UNIMPLEMENTED
440 bool "Just emulate the FPU unimplemented instructions"
442 Select this if you know there does have a hardware FPU on your
443 SoC, but some floating point instructions are not implemented by that.
447 config PPC_TRANSACTIONAL_MEM
448 bool "Transactional Memory support for POWERPC"
449 depends on PPC_BOOK3S_64
455 Support user-mode Transactional Memory on POWERPC.
457 config LD_HEAD_STUB_CATCH
458 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
462 Very large kernels can cause linker branch stubs to be generated by
463 code in head_64.S, which moves the head text sections out of their
464 specified location. This option can work around the problem.
468 config MPROFILE_KERNEL
469 depends on PPC64 && CPU_LITTLE_ENDIAN
470 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
473 bool "Support for enabling/disabling CPUs"
474 depends on SMP && (PPC_PSERIES || \
475 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
477 Say Y here to be able to disable and re-enable individual
478 CPUs at runtime on SMP machines.
480 Say N if you are unsure.
482 config ARCH_CPU_PROBE_RELEASE
484 depends on HOTPLUG_CPU
486 config ARCH_ENABLE_MEMORY_HOTPLUG
489 config ARCH_HAS_WALK_MEMORY
492 config ARCH_ENABLE_MEMORY_HOTREMOVE
495 config PPC64_SUPPORTS_MEMORY_FAILURE
496 bool "Add support for memory hwpoison"
497 depends on PPC_BOOK3S_64
498 default "y" if PPC_POWERNV
499 select ARCH_SUPPORTS_MEMORY_FAILURE
502 bool "kexec system call"
503 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
506 kexec is a system call that implements the ability to shutdown your
507 current kernel, and to start another kernel. It is like a reboot
508 but it is independent of the system firmware. And like a reboot
509 you can start any kernel with it, not just Linux.
511 The name comes from the similarity to the exec system call.
513 It is an ongoing process to be certain the hardware in a machine
514 is properly shutdown, so do not be surprised if this code does not
515 initially work for you. As of this writing the exact hardware
516 interface is strongly in flux, so no good recommendation can be
520 bool "kexec file based system call"
522 select HAVE_IMA_KEXEC
526 depends on CRYPTO_SHA256=y
528 This is a new version of the kexec system call. This call is
529 file based and takes in file descriptors as system call arguments
530 for kernel and initramfs as opposed to a list of segments as is the
531 case for the older kexec call.
533 config ARCH_HAS_KEXEC_PURGATORY
537 bool "Build a relocatable kernel"
538 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
539 select NONSTATIC_KERNEL
540 select MODULE_REL_CRCS if MODVERSIONS
542 This builds a kernel image that is capable of running at the
543 location the kernel is loaded at. For ppc32, there is no any
544 alignment restrictions, and this feature is a superset of
545 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
546 16k-aligned base address. The kernel is linked as a
547 position-independent executable (PIE) and contains dynamic relocations
548 which are processed early in the bootup process.
550 One use is for the kexec on panic case where the recovery kernel
551 must live at a different physical address than the primary
554 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
555 it has been loaded at and the compile time physical addresses
556 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
557 setting can still be useful to bootwrappers that need to know the
558 load address of the kernel (eg. u-boot/mkimage).
560 config RELOCATABLE_TEST
561 bool "Test relocatable kernel"
562 depends on (PPC64 && RELOCATABLE)
565 This runs the relocatable kernel at the address it was initially
566 loaded at, which tends to be non-zero and therefore test the
570 bool "Build a dump capture kernel"
571 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
572 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
574 Build a kernel suitable for use as a dump capture kernel.
575 The same kernel binary can be used as production kernel and dump
579 bool "Firmware-assisted dump"
580 depends on PPC64 && PPC_RTAS
584 A robust mechanism to get reliable kernel crash dump with
585 assistance from firmware. This approach does not use kexec,
586 instead firmware assists in booting the capture kernel
587 while preserving memory contents. Firmware-assisted dump
588 is meant to be a kdump replacement offering robustness and
589 speed not possible without system firmware assistance.
594 bool "Distribute interrupts on all CPUs by default"
597 This option gives the kernel permission to distribute IRQs across
598 multiple CPUs. Saying N here will route all IRQs to the first
599 CPU. Generally saying Y is safe, although some problems have been
600 reported with SMP Power Macintoshes with this option enabled.
605 default y if SMP && PPC_PSERIES
611 depends on NEED_MULTIPLE_NODES
613 config USE_PERCPU_NUMA_NODE_ID
617 config HAVE_MEMORYLESS_NODES
621 config ARCH_SELECT_MEMORY_MODEL
625 config ARCH_FLATMEM_ENABLE
627 depends on (PPC64 && !NUMA) || PPC32
629 config ARCH_SPARSEMEM_ENABLE
632 select SPARSEMEM_VMEMMAP_ENABLE
634 config ARCH_SPARSEMEM_DEFAULT
636 depends on PPC_BOOK3S_64
638 config SYS_SUPPORTS_HUGETLBFS
641 config ILLEGAL_POINTER_VALUE
643 # This is roughly half way between the top of user space and the bottom
644 # of kernel space, which seems about as good as we can get.
645 default 0x5deadbeef0000000 if PPC64
648 config ARCH_MEMORY_PROBE
650 depends on MEMORY_HOTPLUG
652 # Some NUMA nodes have memory ranges that span
653 # other nodes. Even though a pfn is valid and
654 # between a node's start and end pfns, it may not
655 # reside on that node. See memmap_init_zone()
657 config NODES_SPAN_OTHER_NODES
659 depends on NEED_MULTIPLE_NODES
662 bool "Using standard binutils settings"
666 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
667 Note, that kernel will be able to run only those applications,
668 which had been compiled using binutils later than 2.17.50.0.3 with
669 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
670 the older binutils, you can patch them with a trivial patch, which
671 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
677 Select the kernel logical page size. Increasing the page size
678 will reduce software overhead at each page boundary, allow
679 hardware prefetch mechanisms to be more effective, and allow
680 larger dma transfers increasing IO efficiency and reducing
681 overhead. However the utilization of memory will increase.
682 For example, each cached file will using a multiple of the
683 page size to hold its contents and the difference between the
684 end of file and the end of page is wasted.
686 Some dedicated systems, such as software raid serving with
687 accelerated calculations, have shown significant increases.
689 If you configure a 64 bit kernel for 64k pages but the
690 processor does not support them, then the kernel will simulate
691 them with 4k pages, loading them on demand, but with the
692 reduced software overhead and larger internal fragmentation.
693 For the 32 bit kernel, a large page option will not be offered
694 unless it is supported by the configured processor.
696 If unsure, choose 4K_PAGES.
700 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
704 depends on 44x || PPC_8xx
708 depends on !PPC_FSL_BOOK3E && (44x || PPC_BOOK3S_64 || PPC_BOOK3E_64)
709 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
711 config PPC_256K_PAGES
712 bool "256k page size"
713 depends on 44x && !STDBINUTILS && !PPC_47x
715 Make the page size 256k.
717 As the ELF standard only requires alignment to support page
718 sizes up to 64k, you will need to compile all of your user
719 space applications with a non-standard binutils settings
720 (see the STDBINUTILS description for details).
722 Say N unless you know what you are doing.
727 int "Thread shift" if EXPERT
729 default "15" if PPC_256K_PAGES
730 default "14" if PPC64
733 Used to define the stack size. The default is almost always what you
734 want. Only change this if you know what you are doing.
736 config FORCE_MAX_ZONEORDER
737 int "Maximum zone order"
738 range 8 9 if PPC64 && PPC_64K_PAGES
739 default "9" if PPC64 && PPC_64K_PAGES
740 range 13 13 if PPC64 && !PPC_64K_PAGES
741 default "13" if PPC64 && !PPC_64K_PAGES
742 range 9 64 if PPC32 && PPC_16K_PAGES
743 default "9" if PPC32 && PPC_16K_PAGES
744 range 7 64 if PPC32 && PPC_64K_PAGES
745 default "7" if PPC32 && PPC_64K_PAGES
746 range 5 64 if PPC32 && PPC_256K_PAGES
747 default "5" if PPC32 && PPC_256K_PAGES
751 The kernel memory allocator divides physically contiguous memory
752 blocks into "zones", where each zone is a power of two number of
753 pages. This option selects the largest power of two that the kernel
754 keeps in the memory allocator. If you need to allocate very large
755 blocks of physically contiguous memory, then you may need to
758 This config option is actually maximum order plus one. For example,
759 a value of 11 means that the largest free memory block is 2^10 pages.
761 The page size is not necessarily 4KB. For example, on 64-bit
762 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
763 this in mind when choosing a value for this option.
765 config PPC_SUBPAGE_PROT
766 bool "Support setting protections for 4k subpages"
767 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
769 This option adds support for a system call to allow user programs
770 to set access permissions (read/write, readonly, or no access)
771 on the 4k subpages of each 64k page.
773 config PPC_COPRO_BASE
778 bool "SMT (Hyperthreading) scheduler support"
779 depends on PPC64 && SMP
781 SMT scheduler support improves the CPU scheduler's decision making
782 when dealing with POWER5 cpus at a cost of slightly increased
783 overhead in some places. If unsure say N here.
785 config PPC_DENORMALISATION
786 bool "PowerPC denormalisation exception handling"
787 depends on PPC_BOOK3S_64
788 default "y" if PPC_POWERNV
790 Add support for handling denormalisation of single precision
791 values. Useful for bare metal only. If unsure say Y here.
794 bool "Default bootloader kernel arguments"
797 string "Initial kernel command string"
798 depends on CMDLINE_BOOL
799 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
801 On some platforms, there is currently no way for the boot loader to
802 pass arguments to the kernel. For these platforms, you can supply
803 some command-line options at build time by entering them here. In
804 most cases you will need to specify the root device here.
807 bool "Always use the default kernel command string"
808 depends on CMDLINE_BOOL
810 Always use the default kernel command string, even if the boot
811 loader passes other arguments to the kernel.
812 This is useful if you cannot or don't want to change the
813 command-line options your boot loader passes to the kernel.
816 string "Additional default image types"
818 List additional targets to be built by the bootwrapper here (separated
819 by spaces). This is useful for targets that depend of device tree
820 files in the .dts directory.
822 Targets in this list will be build as part of the default build
823 target, or when the user does a 'make zImage' or a
824 'make zImage.initrd'.
826 If unsure, leave blank
828 config ARCH_WANTS_FREEZER_CONTROL
832 source kernel/power/Kconfig
835 bool "Enable seccomp to safely compute untrusted bytecode"
839 This kernel feature is useful for number crunching applications
840 that may need to compute untrusted bytecode during their
841 execution. By using pipes or other transports made available to
842 the process as file descriptors supporting the read/write
843 syscalls, it's possible to isolate those applications in
844 their own address space using seccomp. Once seccomp is
845 enabled via /proc/<pid>/seccomp, it cannot be disabled
846 and the task is only allowed to execute a few safe syscalls
847 defined by each seccomp mode.
849 If unsure, say Y. Only embedded should say N here.
852 prompt "PowerPC Memory Protection Keys"
854 depends on PPC_BOOK3S_64
855 select ARCH_USES_HIGH_VMA_FLAGS
856 select ARCH_HAS_PKEYS
858 Memory Protection Keys provides a mechanism for enforcing
859 page-based protections, but without requiring modification of the
860 page tables when an application changes protection domains.
862 For details, see Documentation/vm/protection-keys.rst
875 bool "Support for ISA-bus hardware"
879 Find out whether you have ISA slots on your motherboard. ISA is the
880 name of a bus system, i.e. the way the CPU talks to the other stuff
881 inside your box. If you have an Apple machine, say N here; if you
882 have an IBM RS/6000 or pSeries machine, say Y. If you have an
883 embedded board, consult your board documentation.
889 config GENERIC_ISA_DMA
891 depends on ISA_DMA_API
894 config PPC_INDIRECT_PCI
897 default y if 40x || 44x
911 select PPC_INDIRECT_PCI
917 depends on SUSPEND && (PPC_85xx || PPC_86xx)
919 Freescale MPC85xx/MPC86xx power management controller support
920 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
925 depends on SUSPEND && (44x || 40x)
927 PPC4xx Clock Power Management (CPM) support (suspend/resume).
928 It also enables support for two different idle states (idle-wait
935 bool "Freescale Local Bus support"
937 Enables reporting of errors from the Freescale local bus
938 controller. Also contains some common code used by
939 drivers for specific local bus peripherals.
943 depends on PPC_83xx || QUICC_ENGINE || CPM2
945 Freescale General-purpose Timers support
947 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
951 # Platforms that what PCI turned unconditionally just do select PCI
952 # in their config node. Platforms that want to choose at config
953 # time should select PPC_PCI_CHOICE
954 config PPC_PCI_CHOICE
958 bool "PCI support" if PPC_PCI_CHOICE
959 default y if !40x && !CPM2 && !PPC_8xx && !PPC_83xx \
960 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
961 default PCI_QSPAN if PPC_8xx
962 select GENERIC_PCI_IOMAP
964 Find out whether your system includes a PCI bus. PCI is the name of
965 a bus system, i.e. the way the CPU talks to the other stuff inside
966 your box. If you say Y here, the kernel will include drivers and
967 infrastructure code to support PCI bus devices.
980 Say Y here if you have a system based on a Motorola 8xx-series
981 embedded processor with a QSPAN PCI interface, otherwise say N.
985 depends on PCI && 8260
986 select PPC_INDIRECT_PCI
989 source "drivers/pci/Kconfig"
991 source "drivers/pcmcia/Kconfig"
998 tristate "RapidIO support"
999 depends on HAS_RAPIDIO || PCI
1001 If you say Y here, the kernel will include drivers and
1002 infrastructure code to support RapidIO interconnect devices.
1005 bool "Freescale Embedded SRIO Controller support"
1006 depends on RAPIDIO = y && HAS_RAPIDIO
1009 Include support for RapidIO controller on Freescale embedded
1010 processors (MPC8548, MPC8641, etc).
1012 source "drivers/rapidio/Kconfig"
1014 config PPC_RTAS_FILTER
1015 bool "Enable filtering of RTAS syscalls"
1019 The RTAS syscall API has security issues that could be used to
1020 compromise system integrity. This option enforces restrictions on the
1021 RTAS calls and arguments passed by userspace programs to mitigate
1024 Say Y unless you know what you are doing and the filter is causing
1029 config NONSTATIC_KERNEL
1033 menu "Advanced setup"
1036 config ADVANCED_OPTIONS
1037 bool "Prompt for advanced kernel configuration options"
1039 This option will enable prompting for a variety of advanced kernel
1040 configuration options. These options can cause the kernel to not
1041 work if they are set incorrectly, but can be used to optimize certain
1042 aspects of kernel memory management.
1044 Unless you know what you are doing, say N here.
1046 comment "Default settings for advanced configuration options are used"
1047 depends on !ADVANCED_OPTIONS
1049 config LOWMEM_SIZE_BOOL
1050 bool "Set maximum low memory"
1051 depends on ADVANCED_OPTIONS
1053 This option allows you to set the maximum amount of memory which
1054 will be used as "low memory", that is, memory which the kernel can
1055 access directly, without having to set up a kernel virtual mapping.
1056 This can be useful in optimizing the layout of kernel virtual
1059 Say N here unless you know what you are doing.
1062 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1063 default "0x30000000"
1065 config LOWMEM_CAM_NUM_BOOL
1066 bool "Set number of CAMs to use to map low memory"
1067 depends on ADVANCED_OPTIONS && FSL_BOOKE
1069 This option allows you to set the maximum number of CAM slots that
1070 will be used to map low memory. There are a limited number of slots
1071 available and even more limited number that will fit in the L1 MMU.
1072 However, using more entries will allow mapping more low memory. This
1073 can be useful in optimizing the layout of kernel virtual memory.
1075 Say N here unless you know what you are doing.
1077 config LOWMEM_CAM_NUM
1078 depends on FSL_BOOKE
1079 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1082 config DYNAMIC_MEMSTART
1083 bool "Enable page aligned dynamic load address for kernel"
1084 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1085 select NONSTATIC_KERNEL
1087 This option enables the kernel to be loaded at any page aligned
1088 physical address. The kernel creates a mapping from KERNELBASE to
1089 the address where the kernel is loaded. The page size here implies
1090 the TLB page size of the mapping for kernel on the particular platform.
1091 Please refer to the init code for finding the TLB page size.
1093 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1094 kernel image, where the only restriction is the page aligned kernel
1095 load address. When this option is enabled, the compile time physical
1096 address CONFIG_PHYSICAL_START is ignored.
1098 This option is overridden by CONFIG_RELOCATABLE
1100 config PAGE_OFFSET_BOOL
1101 bool "Set custom page offset address"
1102 depends on ADVANCED_OPTIONS
1104 This option allows you to set the kernel virtual address at which
1105 the kernel will map low memory. This can be useful in optimizing
1106 the virtual memory layout of the system.
1108 Say N here unless you know what you are doing.
1111 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1112 default "0xc0000000"
1114 config KERNEL_START_BOOL
1115 bool "Set custom kernel base address"
1116 depends on ADVANCED_OPTIONS
1118 This option allows you to set the kernel virtual address at which
1119 the kernel will be loaded. Normally this should match PAGE_OFFSET
1120 however there are times (like kdump) that one might not want them
1123 Say N here unless you know what you are doing.
1126 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1127 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1128 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1129 default "0xc0000000"
1131 config PHYSICAL_START_BOOL
1132 bool "Set physical address where the kernel is loaded"
1133 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1135 This gives the physical address where the kernel is loaded.
1137 Say N here unless you know what you are doing.
1139 config PHYSICAL_START
1140 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1141 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1142 default "0x00000000"
1144 config PHYSICAL_ALIGN
1146 default "0x04000000" if FSL_BOOKE
1148 This value puts the alignment restrictions on physical address
1149 where kernel is loaded and run from. Kernel is compiled for an
1150 address which meets above alignment restriction.
1152 config TASK_SIZE_BOOL
1153 bool "Set custom user task size"
1154 depends on ADVANCED_OPTIONS
1156 This option allows you to set the amount of virtual address space
1157 allocated to user tasks. This can be useful in optimizing the
1158 virtual memory layout of the system.
1160 Say N here unless you know what you are doing.
1163 hex "Size of user task space" if TASK_SIZE_BOOL
1164 default "0x80000000" if PPC_8xx
1165 default "0xc0000000"
1167 config CONSISTENT_SIZE_BOOL
1168 bool "Set custom consistent memory pool size"
1169 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1171 This option allows you to set the size of the
1172 consistent memory pool. This pool of virtual memory
1173 is used to make consistent memory allocations.
1175 config CONSISTENT_SIZE
1176 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1177 default "0x00200000" if NOT_COHERENT_CACHE
1180 bool "Pinned Kernel TLBs (860 ONLY)"
1181 depends on ADVANCED_OPTIONS && PPC_8xx && \
1182 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1185 bool "Pinned TLB for DATA"
1190 bool "Pinned TLB for IMMR"
1195 bool "Pinned TLB for TEXT"
1201 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1204 default "0xc000000000000000"
1207 default "0xc000000000000000"
1208 config PHYSICAL_START
1210 default "0x00000000"
1216 config PPC_LIB_RHEAP
1219 source "arch/powerpc/kvm/Kconfig"
1221 source "kernel/livepatch/Kconfig"