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_BARRIER_NOSPEC
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_STACKPROTECTOR if $(cc-option,-mstack-protector-guard=tls)
184 select HAVE_CONTEXT_TRACKING if PPC64
185 select HAVE_DEBUG_KMEMLEAK
186 select HAVE_DEBUG_STACKOVERFLOW
187 select HAVE_DYNAMIC_FTRACE
188 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
189 select HAVE_EBPF_JIT if PPC64
190 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
191 select HAVE_FTRACE_MCOUNT_RECORD
192 select HAVE_FUNCTION_GRAPH_TRACER
193 select HAVE_FUNCTION_TRACER
194 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
195 select HAVE_GENERIC_GUP
196 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
198 select HAVE_IOREMAP_PROT
199 select HAVE_IRQ_EXIT_ON_IRQ_STACK
200 select HAVE_KERNEL_GZIP
201 select HAVE_KERNEL_XZ if PPC_BOOK3S
203 select HAVE_KPROBES_ON_FTRACE
204 select HAVE_KRETPROBES
205 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
206 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
208 select HAVE_MEMBLOCK_NODE_MAP
209 select HAVE_MOD_ARCH_SPECIFIC
210 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
211 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
213 select HAVE_OPTPROBES if PPC64
214 select HAVE_PERF_EVENTS
215 select HAVE_PERF_EVENTS_NMI if PPC64
216 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
217 select HAVE_PERF_REGS
218 select HAVE_PERF_USER_STACK_DUMP
219 select HAVE_RCU_TABLE_FREE if SMP
220 select HAVE_REGS_AND_STACK_ACCESS_API
221 select HAVE_RELIABLE_STACKTRACE if PPC64 && CPU_LITTLE_ENDIAN
222 select HAVE_SYSCALL_TRACEPOINTS
223 select HAVE_VIRT_CPU_ACCOUNTING
224 select HAVE_IRQ_TIME_ACCOUNTING
226 select IOMMU_HELPER if PPC64
228 select IRQ_FORCED_THREADING
229 select MODULES_USE_ELF_RELA
230 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
231 select NEED_SG_DMA_LENGTH
234 select OF_EARLY_FLATTREE
235 select OF_RESERVED_MEM
236 select OLD_SIGACTION if PPC32
237 select OLD_SIGSUSPEND
240 select SYSCTL_EXCEPTION_TRACE
241 select VIRT_TO_BUS if !PPC64
243 # Please keep this list sorted alphabetically.
246 config PPC_BARRIER_NOSPEC
249 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
265 select COMPAT_BINFMT_ELF
266 select ARCH_WANT_OLD_COMPAT_IPC
267 select COMPAT_OLD_SIGACTION
269 config SYSVIPC_COMPAT
271 depends on COMPAT && SYSVIPC
274 # All PPC32s use generic nvram driver through ppc_md
279 config SCHED_OMIT_FRAME_POINTER
283 config ARCH_MAY_HAVE_PC_FDC
287 config PPC_UDBG_16550
291 config GENERIC_TBSYNC
293 default y if PPC32 && SMP
305 config SYS_SUPPORTS_APM_EMULATION
306 default y if PMAC_APM_EMU
312 Used to allow a board to specify it wants an ePAPR compliant wrapper.
315 config DEFAULT_UIMAGE
318 Used to allow a board to specify it wants a uImage built by default
321 config ARCH_HIBERNATION_POSSIBLE
325 config ARCH_SUSPEND_POSSIBLE
327 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
328 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
331 config PPC_DCR_NATIVE
341 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
344 config PPC_OF_PLATFORM_PCI
347 depends on PPC64 # not supported on 32 bits yet
350 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
351 depends on PPC32 || PPC_BOOK3S_64
354 config ARCH_SUPPORTS_UPROBES
357 config PPC_ADV_DEBUG_REGS
359 depends on 40x || BOOKE
362 config PPC_ADV_DEBUG_IACS
364 depends on PPC_ADV_DEBUG_REGS
368 config PPC_ADV_DEBUG_DACS
370 depends on PPC_ADV_DEBUG_REGS
373 config PPC_ADV_DEBUG_DVCS
375 depends on PPC_ADV_DEBUG_REGS
379 config PPC_ADV_DEBUG_DAC_RANGE
381 depends on PPC_ADV_DEBUG_REGS && 44x
388 config PGTABLE_LEVELS
391 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
394 source "arch/powerpc/sysdev/Kconfig"
395 source "arch/powerpc/platforms/Kconfig"
397 menu "Kernel options"
400 bool "High memory support"
403 source kernel/Kconfig.hz
405 config HUGETLB_PAGE_SIZE_VARIABLE
407 depends on HUGETLB_PAGE
410 config MATH_EMULATION
411 bool "Math emulation"
412 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
414 Some PowerPC chips designed for embedded applications do not have
415 a floating-point unit and therefore do not implement the
416 floating-point instructions in the PowerPC instruction set. If you
417 say Y here, the kernel will include code to emulate a floating-point
418 unit, which will allow programs that use floating-point
421 This is also useful to emulate missing (optional) instructions
422 such as fsqrt on cores that do have an FPU but do not implement
423 them (such as Freescale BookE).
426 prompt "Math emulation options"
427 default MATH_EMULATION_FULL
428 depends on MATH_EMULATION
430 config MATH_EMULATION_FULL
431 bool "Emulate all the floating point instructions"
433 Select this option will enable the kernel to support to emulate
434 all the floating point instructions. If your SoC doesn't have
435 a FPU, you should select this.
437 config MATH_EMULATION_HW_UNIMPLEMENTED
438 bool "Just emulate the FPU unimplemented instructions"
440 Select this if you know there does have a hardware FPU on your
441 SoC, but some floating point instructions are not implemented by that.
445 config PPC_TRANSACTIONAL_MEM
446 bool "Transactional Memory support for POWERPC"
447 depends on PPC_BOOK3S_64
453 Support user-mode Transactional Memory on POWERPC.
455 config LD_HEAD_STUB_CATCH
456 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
460 Very large kernels can cause linker branch stubs to be generated by
461 code in head_64.S, which moves the head text sections out of their
462 specified location. This option can work around the problem.
466 config MPROFILE_KERNEL
467 depends on PPC64 && CPU_LITTLE_ENDIAN
468 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
471 bool "Support for enabling/disabling CPUs"
472 depends on SMP && (PPC_PSERIES || \
473 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
475 Say Y here to be able to disable and re-enable individual
476 CPUs at runtime on SMP machines.
478 Say N if you are unsure.
480 config ARCH_CPU_PROBE_RELEASE
482 depends on HOTPLUG_CPU
484 config ARCH_ENABLE_MEMORY_HOTPLUG
487 config ARCH_HAS_WALK_MEMORY
490 config ARCH_ENABLE_MEMORY_HOTREMOVE
493 config PPC64_SUPPORTS_MEMORY_FAILURE
494 bool "Add support for memory hwpoison"
495 depends on PPC_BOOK3S_64
496 default "y" if PPC_POWERNV
497 select ARCH_SUPPORTS_MEMORY_FAILURE
500 bool "kexec system call"
501 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
504 kexec is a system call that implements the ability to shutdown your
505 current kernel, and to start another kernel. It is like a reboot
506 but it is independent of the system firmware. And like a reboot
507 you can start any kernel with it, not just Linux.
509 The name comes from the similarity to the exec system call.
511 It is an ongoing process to be certain the hardware in a machine
512 is properly shutdown, so do not be surprised if this code does not
513 initially work for you. As of this writing the exact hardware
514 interface is strongly in flux, so no good recommendation can be
518 bool "kexec file based system call"
520 select HAVE_IMA_KEXEC
524 depends on CRYPTO_SHA256=y
526 This is a new version of the kexec system call. This call is
527 file based and takes in file descriptors as system call arguments
528 for kernel and initramfs as opposed to a list of segments as is the
529 case for the older kexec call.
531 config ARCH_HAS_KEXEC_PURGATORY
535 bool "Build a relocatable kernel"
536 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
537 select NONSTATIC_KERNEL
538 select MODULE_REL_CRCS if MODVERSIONS
540 This builds a kernel image that is capable of running at the
541 location the kernel is loaded at. For ppc32, there is no any
542 alignment restrictions, and this feature is a superset of
543 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
544 16k-aligned base address. The kernel is linked as a
545 position-independent executable (PIE) and contains dynamic relocations
546 which are processed early in the bootup process.
548 One use is for the kexec on panic case where the recovery kernel
549 must live at a different physical address than the primary
552 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
553 it has been loaded at and the compile time physical addresses
554 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
555 setting can still be useful to bootwrappers that need to know the
556 load address of the kernel (eg. u-boot/mkimage).
558 config RELOCATABLE_TEST
559 bool "Test relocatable kernel"
560 depends on (PPC64 && RELOCATABLE)
563 This runs the relocatable kernel at the address it was initially
564 loaded at, which tends to be non-zero and therefore test the
568 bool "Build a dump capture kernel"
569 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
570 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
572 Build a kernel suitable for use as a dump capture kernel.
573 The same kernel binary can be used as production kernel and dump
577 bool "Firmware-assisted dump"
578 depends on PPC64 && PPC_RTAS
582 A robust mechanism to get reliable kernel crash dump with
583 assistance from firmware. This approach does not use kexec,
584 instead firmware assists in booting the capture kernel
585 while preserving memory contents. Firmware-assisted dump
586 is meant to be a kdump replacement offering robustness and
587 speed not possible without system firmware assistance.
592 bool "Distribute interrupts on all CPUs by default"
595 This option gives the kernel permission to distribute IRQs across
596 multiple CPUs. Saying N here will route all IRQs to the first
597 CPU. Generally saying Y is safe, although some problems have been
598 reported with SMP Power Macintoshes with this option enabled.
603 default y if SMP && PPC_PSERIES
609 depends on NEED_MULTIPLE_NODES
611 config USE_PERCPU_NUMA_NODE_ID
615 config HAVE_MEMORYLESS_NODES
619 config ARCH_SELECT_MEMORY_MODEL
623 config ARCH_FLATMEM_ENABLE
625 depends on (PPC64 && !NUMA) || PPC32
627 config ARCH_SPARSEMEM_ENABLE
630 select SPARSEMEM_VMEMMAP_ENABLE
632 config ARCH_SPARSEMEM_DEFAULT
634 depends on PPC_BOOK3S_64
636 config SYS_SUPPORTS_HUGETLBFS
639 config ILLEGAL_POINTER_VALUE
641 # This is roughly half way between the top of user space and the bottom
642 # of kernel space, which seems about as good as we can get.
643 default 0x5deadbeef0000000 if PPC64
646 config ARCH_MEMORY_PROBE
648 depends on MEMORY_HOTPLUG
650 # Some NUMA nodes have memory ranges that span
651 # other nodes. Even though a pfn is valid and
652 # between a node's start and end pfns, it may not
653 # reside on that node. See memmap_init_zone()
655 config NODES_SPAN_OTHER_NODES
657 depends on NEED_MULTIPLE_NODES
660 bool "Using standard binutils settings"
664 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
665 Note, that kernel will be able to run only those applications,
666 which had been compiled using binutils later than 2.17.50.0.3 with
667 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
668 the older binutils, you can patch them with a trivial patch, which
669 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
675 Select the kernel logical page size. Increasing the page size
676 will reduce software overhead at each page boundary, allow
677 hardware prefetch mechanisms to be more effective, and allow
678 larger dma transfers increasing IO efficiency and reducing
679 overhead. However the utilization of memory will increase.
680 For example, each cached file will using a multiple of the
681 page size to hold its contents and the difference between the
682 end of file and the end of page is wasted.
684 Some dedicated systems, such as software raid serving with
685 accelerated calculations, have shown significant increases.
687 If you configure a 64 bit kernel for 64k pages but the
688 processor does not support them, then the kernel will simulate
689 them with 4k pages, loading them on demand, but with the
690 reduced software overhead and larger internal fragmentation.
691 For the 32 bit kernel, a large page option will not be offered
692 unless it is supported by the configured processor.
694 If unsure, choose 4K_PAGES.
698 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
702 depends on 44x || PPC_8xx
706 depends on !PPC_FSL_BOOK3E && (44x || PPC_BOOK3S_64 || PPC_BOOK3E_64)
707 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
709 config PPC_256K_PAGES
710 bool "256k page size"
711 depends on 44x && !STDBINUTILS
713 Make the page size 256k.
715 As the ELF standard only requires alignment to support page
716 sizes up to 64k, you will need to compile all of your user
717 space applications with a non-standard binutils settings
718 (see the STDBINUTILS description for details).
720 Say N unless you know what you are doing.
725 int "Thread shift" if EXPERT
727 default "15" if PPC_256K_PAGES
728 default "14" if PPC64
731 Used to define the stack size. The default is almost always what you
732 want. Only change this if you know what you are doing.
734 config FORCE_MAX_ZONEORDER
735 int "Maximum zone order"
736 range 8 9 if PPC64 && PPC_64K_PAGES
737 default "9" if PPC64 && PPC_64K_PAGES
738 range 13 13 if PPC64 && !PPC_64K_PAGES
739 default "13" if PPC64 && !PPC_64K_PAGES
740 range 9 64 if PPC32 && PPC_16K_PAGES
741 default "9" if PPC32 && PPC_16K_PAGES
742 range 7 64 if PPC32 && PPC_64K_PAGES
743 default "7" if PPC32 && PPC_64K_PAGES
744 range 5 64 if PPC32 && PPC_256K_PAGES
745 default "5" if PPC32 && PPC_256K_PAGES
749 The kernel memory allocator divides physically contiguous memory
750 blocks into "zones", where each zone is a power of two number of
751 pages. This option selects the largest power of two that the kernel
752 keeps in the memory allocator. If you need to allocate very large
753 blocks of physically contiguous memory, then you may need to
756 This config option is actually maximum order plus one. For example,
757 a value of 11 means that the largest free memory block is 2^10 pages.
759 The page size is not necessarily 4KB. For example, on 64-bit
760 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
761 this in mind when choosing a value for this option.
763 config PPC_SUBPAGE_PROT
764 bool "Support setting protections for 4k subpages"
765 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
767 This option adds support for a system call to allow user programs
768 to set access permissions (read/write, readonly, or no access)
769 on the 4k subpages of each 64k page.
771 config PPC_COPRO_BASE
776 bool "SMT (Hyperthreading) scheduler support"
777 depends on PPC64 && SMP
779 SMT scheduler support improves the CPU scheduler's decision making
780 when dealing with POWER5 cpus at a cost of slightly increased
781 overhead in some places. If unsure say N here.
783 config PPC_DENORMALISATION
784 bool "PowerPC denormalisation exception handling"
785 depends on PPC_BOOK3S_64
786 default "y" if PPC_POWERNV
788 Add support for handling denormalisation of single precision
789 values. Useful for bare metal only. If unsure say Y here.
792 bool "Default bootloader kernel arguments"
795 string "Initial kernel command string"
796 depends on CMDLINE_BOOL
797 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
799 On some platforms, there is currently no way for the boot loader to
800 pass arguments to the kernel. For these platforms, you can supply
801 some command-line options at build time by entering them here. In
802 most cases you will need to specify the root device here.
805 bool "Always use the default kernel command string"
806 depends on CMDLINE_BOOL
808 Always use the default kernel command string, even if the boot
809 loader passes other arguments to the kernel.
810 This is useful if you cannot or don't want to change the
811 command-line options your boot loader passes to the kernel.
814 string "Additional default image types"
816 List additional targets to be built by the bootwrapper here (separated
817 by spaces). This is useful for targets that depend of device tree
818 files in the .dts directory.
820 Targets in this list will be build as part of the default build
821 target, or when the user does a 'make zImage' or a
822 'make zImage.initrd'.
824 If unsure, leave blank
826 config ARCH_WANTS_FREEZER_CONTROL
830 source kernel/power/Kconfig
833 bool "Enable seccomp to safely compute untrusted bytecode"
837 This kernel feature is useful for number crunching applications
838 that may need to compute untrusted bytecode during their
839 execution. By using pipes or other transports made available to
840 the process as file descriptors supporting the read/write
841 syscalls, it's possible to isolate those applications in
842 their own address space using seccomp. Once seccomp is
843 enabled via /proc/<pid>/seccomp, it cannot be disabled
844 and the task is only allowed to execute a few safe syscalls
845 defined by each seccomp mode.
847 If unsure, say Y. Only embedded should say N here.
850 prompt "PowerPC Memory Protection Keys"
852 depends on PPC_BOOK3S_64
853 select ARCH_USES_HIGH_VMA_FLAGS
854 select ARCH_HAS_PKEYS
856 Memory Protection Keys provides a mechanism for enforcing
857 page-based protections, but without requiring modification of the
858 page tables when an application changes protection domains.
860 For details, see Documentation/vm/protection-keys.rst
873 bool "Support for ISA-bus hardware"
877 Find out whether you have ISA slots on your motherboard. ISA is the
878 name of a bus system, i.e. the way the CPU talks to the other stuff
879 inside your box. If you have an Apple machine, say N here; if you
880 have an IBM RS/6000 or pSeries machine, say Y. If you have an
881 embedded board, consult your board documentation.
887 config GENERIC_ISA_DMA
889 depends on ISA_DMA_API
892 config PPC_INDIRECT_PCI
895 default y if 40x || 44x
909 select PPC_INDIRECT_PCI
915 depends on SUSPEND && (PPC_85xx || PPC_86xx)
917 Freescale MPC85xx/MPC86xx power management controller support
918 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
923 depends on SUSPEND && (44x || 40x)
925 PPC4xx Clock Power Management (CPM) support (suspend/resume).
926 It also enables support for two different idle states (idle-wait
933 bool "Freescale Local Bus support"
935 Enables reporting of errors from the Freescale local bus
936 controller. Also contains some common code used by
937 drivers for specific local bus peripherals.
941 depends on PPC_83xx || QUICC_ENGINE || CPM2
943 Freescale General-purpose Timers support
945 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
949 # Platforms that what PCI turned unconditionally just do select PCI
950 # in their config node. Platforms that want to choose at config
951 # time should select PPC_PCI_CHOICE
952 config PPC_PCI_CHOICE
956 bool "PCI support" if PPC_PCI_CHOICE
957 default y if !40x && !CPM2 && !PPC_8xx && !PPC_83xx \
958 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
959 default PCI_QSPAN if PPC_8xx
960 select GENERIC_PCI_IOMAP
962 Find out whether your system includes a PCI bus. PCI is the name of
963 a bus system, i.e. the way the CPU talks to the other stuff inside
964 your box. If you say Y here, the kernel will include drivers and
965 infrastructure code to support PCI bus devices.
978 Say Y here if you have a system based on a Motorola 8xx-series
979 embedded processor with a QSPAN PCI interface, otherwise say N.
983 depends on PCI && 8260
984 select PPC_INDIRECT_PCI
987 source "drivers/pci/Kconfig"
989 source "drivers/pcmcia/Kconfig"
996 tristate "RapidIO support"
997 depends on HAS_RAPIDIO || PCI
999 If you say Y here, the kernel will include drivers and
1000 infrastructure code to support RapidIO interconnect devices.
1003 bool "Freescale Embedded SRIO Controller support"
1004 depends on RAPIDIO = y && HAS_RAPIDIO
1007 Include support for RapidIO controller on Freescale embedded
1008 processors (MPC8548, MPC8641, etc).
1010 source "drivers/rapidio/Kconfig"
1014 config NONSTATIC_KERNEL
1018 menu "Advanced setup"
1021 config ADVANCED_OPTIONS
1022 bool "Prompt for advanced kernel configuration options"
1024 This option will enable prompting for a variety of advanced kernel
1025 configuration options. These options can cause the kernel to not
1026 work if they are set incorrectly, but can be used to optimize certain
1027 aspects of kernel memory management.
1029 Unless you know what you are doing, say N here.
1031 comment "Default settings for advanced configuration options are used"
1032 depends on !ADVANCED_OPTIONS
1034 config LOWMEM_SIZE_BOOL
1035 bool "Set maximum low memory"
1036 depends on ADVANCED_OPTIONS
1038 This option allows you to set the maximum amount of memory which
1039 will be used as "low memory", that is, memory which the kernel can
1040 access directly, without having to set up a kernel virtual mapping.
1041 This can be useful in optimizing the layout of kernel virtual
1044 Say N here unless you know what you are doing.
1047 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1048 default "0x30000000"
1050 config LOWMEM_CAM_NUM_BOOL
1051 bool "Set number of CAMs to use to map low memory"
1052 depends on ADVANCED_OPTIONS && FSL_BOOKE
1054 This option allows you to set the maximum number of CAM slots that
1055 will be used to map low memory. There are a limited number of slots
1056 available and even more limited number that will fit in the L1 MMU.
1057 However, using more entries will allow mapping more low memory. This
1058 can be useful in optimizing the layout of kernel virtual memory.
1060 Say N here unless you know what you are doing.
1062 config LOWMEM_CAM_NUM
1063 depends on FSL_BOOKE
1064 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1067 config DYNAMIC_MEMSTART
1068 bool "Enable page aligned dynamic load address for kernel"
1069 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1070 select NONSTATIC_KERNEL
1072 This option enables the kernel to be loaded at any page aligned
1073 physical address. The kernel creates a mapping from KERNELBASE to
1074 the address where the kernel is loaded. The page size here implies
1075 the TLB page size of the mapping for kernel on the particular platform.
1076 Please refer to the init code for finding the TLB page size.
1078 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1079 kernel image, where the only restriction is the page aligned kernel
1080 load address. When this option is enabled, the compile time physical
1081 address CONFIG_PHYSICAL_START is ignored.
1083 This option is overridden by CONFIG_RELOCATABLE
1085 config PAGE_OFFSET_BOOL
1086 bool "Set custom page offset address"
1087 depends on ADVANCED_OPTIONS
1089 This option allows you to set the kernel virtual address at which
1090 the kernel will map low memory. This can be useful in optimizing
1091 the virtual memory layout of the system.
1093 Say N here unless you know what you are doing.
1096 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1097 default "0xc0000000"
1099 config KERNEL_START_BOOL
1100 bool "Set custom kernel base address"
1101 depends on ADVANCED_OPTIONS
1103 This option allows you to set the kernel virtual address at which
1104 the kernel will be loaded. Normally this should match PAGE_OFFSET
1105 however there are times (like kdump) that one might not want them
1108 Say N here unless you know what you are doing.
1111 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1112 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1113 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1114 default "0xc0000000"
1116 config PHYSICAL_START_BOOL
1117 bool "Set physical address where the kernel is loaded"
1118 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1120 This gives the physical address where the kernel is loaded.
1122 Say N here unless you know what you are doing.
1124 config PHYSICAL_START
1125 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1126 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1127 default "0x00000000"
1129 config PHYSICAL_ALIGN
1131 default "0x04000000" if FSL_BOOKE
1133 This value puts the alignment restrictions on physical address
1134 where kernel is loaded and run from. Kernel is compiled for an
1135 address which meets above alignment restriction.
1137 config TASK_SIZE_BOOL
1138 bool "Set custom user task size"
1139 depends on ADVANCED_OPTIONS
1141 This option allows you to set the amount of virtual address space
1142 allocated to user tasks. This can be useful in optimizing the
1143 virtual memory layout of the system.
1145 Say N here unless you know what you are doing.
1148 hex "Size of user task space" if TASK_SIZE_BOOL
1149 default "0x80000000" if PPC_8xx
1150 default "0xc0000000"
1152 config CONSISTENT_SIZE_BOOL
1153 bool "Set custom consistent memory pool size"
1154 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1156 This option allows you to set the size of the
1157 consistent memory pool. This pool of virtual memory
1158 is used to make consistent memory allocations.
1160 config CONSISTENT_SIZE
1161 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1162 default "0x00200000" if NOT_COHERENT_CACHE
1165 bool "Pinned Kernel TLBs (860 ONLY)"
1166 depends on ADVANCED_OPTIONS && PPC_8xx && \
1167 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1170 bool "Pinned TLB for DATA"
1175 bool "Pinned TLB for IMMR"
1180 bool "Pinned TLB for TEXT"
1186 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1189 default "0xc000000000000000"
1192 default "0xc000000000000000"
1193 config PHYSICAL_START
1195 default "0x00000000"
1201 config PPC_LIB_RHEAP
1204 source "arch/powerpc/kvm/Kconfig"
1206 source "kernel/livepatch/Kconfig"