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_CONTEXT_TRACKING if PPC64
184 select HAVE_DEBUG_KMEMLEAK
185 select HAVE_DEBUG_STACKOVERFLOW
186 select HAVE_DYNAMIC_FTRACE
187 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
188 select HAVE_EBPF_JIT if PPC64
189 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
190 select HAVE_FTRACE_MCOUNT_RECORD
191 select HAVE_FUNCTION_GRAPH_TRACER
192 select HAVE_FUNCTION_TRACER
193 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
194 select HAVE_GENERIC_GUP
195 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
197 select HAVE_IOREMAP_PROT
198 select HAVE_IRQ_EXIT_ON_IRQ_STACK
199 select HAVE_KERNEL_GZIP
200 select HAVE_KERNEL_XZ if PPC_BOOK3S
202 select HAVE_KPROBES_ON_FTRACE
203 select HAVE_KRETPROBES
204 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
205 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
207 select HAVE_MEMBLOCK_NODE_MAP
208 select HAVE_MOD_ARCH_SPECIFIC
209 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
210 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
212 select HAVE_OPTPROBES if PPC64
213 select HAVE_PERF_EVENTS
214 select HAVE_PERF_EVENTS_NMI if PPC64
215 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
216 select HAVE_PERF_REGS
217 select HAVE_PERF_USER_STACK_DUMP
218 select HAVE_RCU_TABLE_FREE if SMP
219 select HAVE_REGS_AND_STACK_ACCESS_API
220 select HAVE_RELIABLE_STACKTRACE if PPC64 && CPU_LITTLE_ENDIAN
221 select HAVE_SYSCALL_TRACEPOINTS
222 select HAVE_VIRT_CPU_ACCOUNTING
223 select HAVE_IRQ_TIME_ACCOUNTING
225 select IOMMU_HELPER if PPC64
227 select IRQ_FORCED_THREADING
228 select MODULES_USE_ELF_RELA
229 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
230 select NEED_SG_DMA_LENGTH
233 select OF_EARLY_FLATTREE
234 select OF_RESERVED_MEM
235 select OLD_SIGACTION if PPC32
236 select OLD_SIGSUSPEND
239 select SYSCTL_EXCEPTION_TRACE
240 select VIRT_TO_BUS if !PPC64
242 # Please keep this list sorted alphabetically.
245 config PPC_BARRIER_NOSPEC
248 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
264 select COMPAT_BINFMT_ELF
265 select ARCH_WANT_OLD_COMPAT_IPC
266 select COMPAT_OLD_SIGACTION
268 config SYSVIPC_COMPAT
270 depends on COMPAT && SYSVIPC
273 # All PPC32s use generic nvram driver through ppc_md
278 config SCHED_OMIT_FRAME_POINTER
282 config ARCH_MAY_HAVE_PC_FDC
286 config PPC_UDBG_16550
290 config GENERIC_TBSYNC
292 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.
314 config DEFAULT_UIMAGE
317 Used to allow a board to specify it wants a uImage built by default
320 config ARCH_HIBERNATION_POSSIBLE
324 config ARCH_SUSPEND_POSSIBLE
326 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
327 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
330 config PPC_DCR_NATIVE
340 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
343 config PPC_OF_PLATFORM_PCI
346 depends on PPC64 # not supported on 32 bits yet
349 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
350 depends on PPC32 || PPC_BOOK3S_64
353 config ARCH_SUPPORTS_UPROBES
356 config PPC_ADV_DEBUG_REGS
358 depends on 40x || BOOKE
361 config PPC_ADV_DEBUG_IACS
363 depends on PPC_ADV_DEBUG_REGS
367 config PPC_ADV_DEBUG_DACS
369 depends on PPC_ADV_DEBUG_REGS
372 config PPC_ADV_DEBUG_DVCS
374 depends on PPC_ADV_DEBUG_REGS
378 config PPC_ADV_DEBUG_DAC_RANGE
380 depends on PPC_ADV_DEBUG_REGS && 44x
387 config PGTABLE_LEVELS
390 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
393 source "arch/powerpc/sysdev/Kconfig"
394 source "arch/powerpc/platforms/Kconfig"
396 menu "Kernel options"
399 bool "High memory support"
402 source kernel/Kconfig.hz
404 config HUGETLB_PAGE_SIZE_VARIABLE
406 depends on HUGETLB_PAGE
409 config MATH_EMULATION
410 bool "Math emulation"
411 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
413 Some PowerPC chips designed for embedded applications do not have
414 a floating-point unit and therefore do not implement the
415 floating-point instructions in the PowerPC instruction set. If you
416 say Y here, the kernel will include code to emulate a floating-point
417 unit, which will allow programs that use floating-point
420 This is also useful to emulate missing (optional) instructions
421 such as fsqrt on cores that do have an FPU but do not implement
422 them (such as Freescale BookE).
425 prompt "Math emulation options"
426 default MATH_EMULATION_FULL
427 depends on MATH_EMULATION
429 config MATH_EMULATION_FULL
430 bool "Emulate all the floating point instructions"
432 Select this option will enable the kernel to support to emulate
433 all the floating point instructions. If your SoC doesn't have
434 a FPU, you should select this.
436 config MATH_EMULATION_HW_UNIMPLEMENTED
437 bool "Just emulate the FPU unimplemented instructions"
439 Select this if you know there does have a hardware FPU on your
440 SoC, but some floating point instructions are not implemented by that.
444 config PPC_TRANSACTIONAL_MEM
445 bool "Transactional Memory support for POWERPC"
446 depends on PPC_BOOK3S_64
452 Support user-mode Transactional Memory on POWERPC.
454 config LD_HEAD_STUB_CATCH
455 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
459 Very large kernels can cause linker branch stubs to be generated by
460 code in head_64.S, which moves the head text sections out of their
461 specified location. This option can work around the problem.
465 config MPROFILE_KERNEL
466 depends on PPC64 && CPU_LITTLE_ENDIAN
467 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
470 bool "Support for enabling/disabling CPUs"
471 depends on SMP && (PPC_PSERIES || \
472 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
474 Say Y here to be able to disable and re-enable individual
475 CPUs at runtime on SMP machines.
477 Say N if you are unsure.
479 config ARCH_CPU_PROBE_RELEASE
481 depends on HOTPLUG_CPU
483 config ARCH_ENABLE_MEMORY_HOTPLUG
486 config ARCH_HAS_WALK_MEMORY
489 config ARCH_ENABLE_MEMORY_HOTREMOVE
492 config PPC64_SUPPORTS_MEMORY_FAILURE
493 bool "Add support for memory hwpoison"
494 depends on PPC_BOOK3S_64
495 default "y" if PPC_POWERNV
496 select ARCH_SUPPORTS_MEMORY_FAILURE
499 bool "kexec system call"
500 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
503 kexec is a system call that implements the ability to shutdown your
504 current kernel, and to start another kernel. It is like a reboot
505 but it is independent of the system firmware. And like a reboot
506 you can start any kernel with it, not just Linux.
508 The name comes from the similarity to the exec system call.
510 It is an ongoing process to be certain the hardware in a machine
511 is properly shutdown, so do not be surprised if this code does not
512 initially work for you. As of this writing the exact hardware
513 interface is strongly in flux, so no good recommendation can be
517 bool "kexec file based system call"
519 select HAVE_IMA_KEXEC
523 depends on CRYPTO_SHA256=y
525 This is a new version of the kexec system call. This call is
526 file based and takes in file descriptors as system call arguments
527 for kernel and initramfs as opposed to a list of segments as is the
528 case for the older kexec call.
530 config ARCH_HAS_KEXEC_PURGATORY
534 bool "Build a relocatable kernel"
535 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
536 select NONSTATIC_KERNEL
537 select MODULE_REL_CRCS if MODVERSIONS
539 This builds a kernel image that is capable of running at the
540 location the kernel is loaded at. For ppc32, there is no any
541 alignment restrictions, and this feature is a superset of
542 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
543 16k-aligned base address. The kernel is linked as a
544 position-independent executable (PIE) and contains dynamic relocations
545 which are processed early in the bootup process.
547 One use is for the kexec on panic case where the recovery kernel
548 must live at a different physical address than the primary
551 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
552 it has been loaded at and the compile time physical addresses
553 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
554 setting can still be useful to bootwrappers that need to know the
555 load address of the kernel (eg. u-boot/mkimage).
557 config RELOCATABLE_TEST
558 bool "Test relocatable kernel"
559 depends on (PPC64 && RELOCATABLE)
562 This runs the relocatable kernel at the address it was initially
563 loaded at, which tends to be non-zero and therefore test the
567 bool "Build a dump capture kernel"
568 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
569 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
571 Build a kernel suitable for use as a dump capture kernel.
572 The same kernel binary can be used as production kernel and dump
576 bool "Firmware-assisted dump"
577 depends on PPC64 && PPC_RTAS
581 A robust mechanism to get reliable kernel crash dump with
582 assistance from firmware. This approach does not use kexec,
583 instead firmware assists in booting the capture kernel
584 while preserving memory contents. Firmware-assisted dump
585 is meant to be a kdump replacement offering robustness and
586 speed not possible without system firmware assistance.
591 bool "Distribute interrupts on all CPUs by default"
594 This option gives the kernel permission to distribute IRQs across
595 multiple CPUs. Saying N here will route all IRQs to the first
596 CPU. Generally saying Y is safe, although some problems have been
597 reported with SMP Power Macintoshes with this option enabled.
602 default y if SMP && PPC_PSERIES
608 depends on NEED_MULTIPLE_NODES
610 config USE_PERCPU_NUMA_NODE_ID
614 config HAVE_MEMORYLESS_NODES
618 config ARCH_SELECT_MEMORY_MODEL
622 config ARCH_FLATMEM_ENABLE
624 depends on (PPC64 && !NUMA) || PPC32
626 config ARCH_SPARSEMEM_ENABLE
629 select SPARSEMEM_VMEMMAP_ENABLE
631 config ARCH_SPARSEMEM_DEFAULT
633 depends on PPC_BOOK3S_64
635 config SYS_SUPPORTS_HUGETLBFS
638 config ILLEGAL_POINTER_VALUE
640 # This is roughly half way between the top of user space and the bottom
641 # of kernel space, which seems about as good as we can get.
642 default 0x5deadbeef0000000 if PPC64
645 config ARCH_MEMORY_PROBE
647 depends on MEMORY_HOTPLUG
649 # Some NUMA nodes have memory ranges that span
650 # other nodes. Even though a pfn is valid and
651 # between a node's start and end pfns, it may not
652 # reside on that node. See memmap_init_zone()
654 config NODES_SPAN_OTHER_NODES
656 depends on NEED_MULTIPLE_NODES
659 bool "Using standard binutils settings"
663 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
664 Note, that kernel will be able to run only those applications,
665 which had been compiled using binutils later than 2.17.50.0.3 with
666 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
667 the older binutils, you can patch them with a trivial patch, which
668 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
674 Select the kernel logical page size. Increasing the page size
675 will reduce software overhead at each page boundary, allow
676 hardware prefetch mechanisms to be more effective, and allow
677 larger dma transfers increasing IO efficiency and reducing
678 overhead. However the utilization of memory will increase.
679 For example, each cached file will using a multiple of the
680 page size to hold its contents and the difference between the
681 end of file and the end of page is wasted.
683 Some dedicated systems, such as software raid serving with
684 accelerated calculations, have shown significant increases.
686 If you configure a 64 bit kernel for 64k pages but the
687 processor does not support them, then the kernel will simulate
688 them with 4k pages, loading them on demand, but with the
689 reduced software overhead and larger internal fragmentation.
690 For the 32 bit kernel, a large page option will not be offered
691 unless it is supported by the configured processor.
693 If unsure, choose 4K_PAGES.
697 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
701 depends on 44x || PPC_8xx
705 depends on !PPC_FSL_BOOK3E && (44x || PPC_BOOK3S_64 || PPC_BOOK3E_64)
706 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
708 config PPC_256K_PAGES
709 bool "256k page size"
710 depends on 44x && !STDBINUTILS
712 Make the page size 256k.
714 As the ELF standard only requires alignment to support page
715 sizes up to 64k, you will need to compile all of your user
716 space applications with a non-standard binutils settings
717 (see the STDBINUTILS description for details).
719 Say N unless you know what you are doing.
724 int "Thread shift" if EXPERT
726 default "15" if PPC_256K_PAGES
727 default "14" if PPC64
730 Used to define the stack size. The default is almost always what you
731 want. Only change this if you know what you are doing.
733 config FORCE_MAX_ZONEORDER
734 int "Maximum zone order"
735 range 8 9 if PPC64 && PPC_64K_PAGES
736 default "9" if PPC64 && PPC_64K_PAGES
737 range 13 13 if PPC64 && !PPC_64K_PAGES
738 default "13" if PPC64 && !PPC_64K_PAGES
739 range 9 64 if PPC32 && PPC_16K_PAGES
740 default "9" if PPC32 && PPC_16K_PAGES
741 range 7 64 if PPC32 && PPC_64K_PAGES
742 default "7" if PPC32 && PPC_64K_PAGES
743 range 5 64 if PPC32 && PPC_256K_PAGES
744 default "5" if PPC32 && PPC_256K_PAGES
748 The kernel memory allocator divides physically contiguous memory
749 blocks into "zones", where each zone is a power of two number of
750 pages. This option selects the largest power of two that the kernel
751 keeps in the memory allocator. If you need to allocate very large
752 blocks of physically contiguous memory, then you may need to
755 This config option is actually maximum order plus one. For example,
756 a value of 11 means that the largest free memory block is 2^10 pages.
758 The page size is not necessarily 4KB. For example, on 64-bit
759 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
760 this in mind when choosing a value for this option.
762 config PPC_SUBPAGE_PROT
763 bool "Support setting protections for 4k subpages"
764 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
766 This option adds support for a system call to allow user programs
767 to set access permissions (read/write, readonly, or no access)
768 on the 4k subpages of each 64k page.
770 config PPC_COPRO_BASE
775 bool "SMT (Hyperthreading) scheduler support"
776 depends on PPC64 && SMP
778 SMT scheduler support improves the CPU scheduler's decision making
779 when dealing with POWER5 cpus at a cost of slightly increased
780 overhead in some places. If unsure say N here.
782 config PPC_DENORMALISATION
783 bool "PowerPC denormalisation exception handling"
784 depends on PPC_BOOK3S_64
785 default "y" if PPC_POWERNV
787 Add support for handling denormalisation of single precision
788 values. Useful for bare metal only. If unsure say Y here.
791 bool "Default bootloader kernel arguments"
794 string "Initial kernel command string"
795 depends on CMDLINE_BOOL
796 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
798 On some platforms, there is currently no way for the boot loader to
799 pass arguments to the kernel. For these platforms, you can supply
800 some command-line options at build time by entering them here. In
801 most cases you will need to specify the root device here.
804 bool "Always use the default kernel command string"
805 depends on CMDLINE_BOOL
807 Always use the default kernel command string, even if the boot
808 loader passes other arguments to the kernel.
809 This is useful if you cannot or don't want to change the
810 command-line options your boot loader passes to the kernel.
813 string "Additional default image types"
815 List additional targets to be built by the bootwrapper here (separated
816 by spaces). This is useful for targets that depend of device tree
817 files in the .dts directory.
819 Targets in this list will be build as part of the default build
820 target, or when the user does a 'make zImage' or a
821 'make zImage.initrd'.
823 If unsure, leave blank
825 config ARCH_WANTS_FREEZER_CONTROL
829 source kernel/power/Kconfig
832 bool "Enable seccomp to safely compute untrusted bytecode"
836 This kernel feature is useful for number crunching applications
837 that may need to compute untrusted bytecode during their
838 execution. By using pipes or other transports made available to
839 the process as file descriptors supporting the read/write
840 syscalls, it's possible to isolate those applications in
841 their own address space using seccomp. Once seccomp is
842 enabled via /proc/<pid>/seccomp, it cannot be disabled
843 and the task is only allowed to execute a few safe syscalls
844 defined by each seccomp mode.
846 If unsure, say Y. Only embedded should say N here.
849 prompt "PowerPC Memory Protection Keys"
851 depends on PPC_BOOK3S_64
852 select ARCH_USES_HIGH_VMA_FLAGS
853 select ARCH_HAS_PKEYS
855 Memory Protection Keys provides a mechanism for enforcing
856 page-based protections, but without requiring modification of the
857 page tables when an application changes protection domains.
859 For details, see Documentation/vm/protection-keys.rst
872 bool "Support for ISA-bus hardware"
876 Find out whether you have ISA slots on your motherboard. ISA is the
877 name of a bus system, i.e. the way the CPU talks to the other stuff
878 inside your box. If you have an Apple machine, say N here; if you
879 have an IBM RS/6000 or pSeries machine, say Y. If you have an
880 embedded board, consult your board documentation.
886 config GENERIC_ISA_DMA
888 depends on ISA_DMA_API
891 config PPC_INDIRECT_PCI
894 default y if 40x || 44x
908 select PPC_INDIRECT_PCI
914 depends on SUSPEND && (PPC_85xx || PPC_86xx)
916 Freescale MPC85xx/MPC86xx power management controller support
917 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
922 depends on SUSPEND && (44x || 40x)
924 PPC4xx Clock Power Management (CPM) support (suspend/resume).
925 It also enables support for two different idle states (idle-wait
932 bool "Freescale Local Bus support"
934 Enables reporting of errors from the Freescale local bus
935 controller. Also contains some common code used by
936 drivers for specific local bus peripherals.
940 depends on PPC_83xx || QUICC_ENGINE || CPM2
942 Freescale General-purpose Timers support
944 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
948 # Platforms that what PCI turned unconditionally just do select PCI
949 # in their config node. Platforms that want to choose at config
950 # time should select PPC_PCI_CHOICE
951 config PPC_PCI_CHOICE
955 bool "PCI support" if PPC_PCI_CHOICE
956 default y if !40x && !CPM2 && !PPC_8xx && !PPC_83xx \
957 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
958 default PCI_QSPAN if PPC_8xx
959 select GENERIC_PCI_IOMAP
961 Find out whether your system includes a PCI bus. PCI is the name of
962 a bus system, i.e. the way the CPU talks to the other stuff inside
963 your box. If you say Y here, the kernel will include drivers and
964 infrastructure code to support PCI bus devices.
977 Say Y here if you have a system based on a Motorola 8xx-series
978 embedded processor with a QSPAN PCI interface, otherwise say N.
982 depends on PCI && 8260
983 select PPC_INDIRECT_PCI
986 source "drivers/pci/Kconfig"
988 source "drivers/pcmcia/Kconfig"
995 tristate "RapidIO support"
996 depends on HAS_RAPIDIO || PCI
998 If you say Y here, the kernel will include drivers and
999 infrastructure code to support RapidIO interconnect devices.
1002 bool "Freescale Embedded SRIO Controller support"
1003 depends on RAPIDIO = y && HAS_RAPIDIO
1006 Include support for RapidIO controller on Freescale embedded
1007 processors (MPC8548, MPC8641, etc).
1009 source "drivers/rapidio/Kconfig"
1013 config NONSTATIC_KERNEL
1017 menu "Advanced setup"
1020 config ADVANCED_OPTIONS
1021 bool "Prompt for advanced kernel configuration options"
1023 This option will enable prompting for a variety of advanced kernel
1024 configuration options. These options can cause the kernel to not
1025 work if they are set incorrectly, but can be used to optimize certain
1026 aspects of kernel memory management.
1028 Unless you know what you are doing, say N here.
1030 comment "Default settings for advanced configuration options are used"
1031 depends on !ADVANCED_OPTIONS
1033 config LOWMEM_SIZE_BOOL
1034 bool "Set maximum low memory"
1035 depends on ADVANCED_OPTIONS
1037 This option allows you to set the maximum amount of memory which
1038 will be used as "low memory", that is, memory which the kernel can
1039 access directly, without having to set up a kernel virtual mapping.
1040 This can be useful in optimizing the layout of kernel virtual
1043 Say N here unless you know what you are doing.
1046 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1047 default "0x30000000"
1049 config LOWMEM_CAM_NUM_BOOL
1050 bool "Set number of CAMs to use to map low memory"
1051 depends on ADVANCED_OPTIONS && FSL_BOOKE
1053 This option allows you to set the maximum number of CAM slots that
1054 will be used to map low memory. There are a limited number of slots
1055 available and even more limited number that will fit in the L1 MMU.
1056 However, using more entries will allow mapping more low memory. This
1057 can be useful in optimizing the layout of kernel virtual memory.
1059 Say N here unless you know what you are doing.
1061 config LOWMEM_CAM_NUM
1062 depends on FSL_BOOKE
1063 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1066 config DYNAMIC_MEMSTART
1067 bool "Enable page aligned dynamic load address for kernel"
1068 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1069 select NONSTATIC_KERNEL
1071 This option enables the kernel to be loaded at any page aligned
1072 physical address. The kernel creates a mapping from KERNELBASE to
1073 the address where the kernel is loaded. The page size here implies
1074 the TLB page size of the mapping for kernel on the particular platform.
1075 Please refer to the init code for finding the TLB page size.
1077 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1078 kernel image, where the only restriction is the page aligned kernel
1079 load address. When this option is enabled, the compile time physical
1080 address CONFIG_PHYSICAL_START is ignored.
1082 This option is overridden by CONFIG_RELOCATABLE
1084 config PAGE_OFFSET_BOOL
1085 bool "Set custom page offset address"
1086 depends on ADVANCED_OPTIONS
1088 This option allows you to set the kernel virtual address at which
1089 the kernel will map low memory. This can be useful in optimizing
1090 the virtual memory layout of the system.
1092 Say N here unless you know what you are doing.
1095 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1096 default "0xc0000000"
1098 config KERNEL_START_BOOL
1099 bool "Set custom kernel base address"
1100 depends on ADVANCED_OPTIONS
1102 This option allows you to set the kernel virtual address at which
1103 the kernel will be loaded. Normally this should match PAGE_OFFSET
1104 however there are times (like kdump) that one might not want them
1107 Say N here unless you know what you are doing.
1110 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1111 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1112 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1113 default "0xc0000000"
1115 config PHYSICAL_START_BOOL
1116 bool "Set physical address where the kernel is loaded"
1117 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1119 This gives the physical address where the kernel is loaded.
1121 Say N here unless you know what you are doing.
1123 config PHYSICAL_START
1124 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1125 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1126 default "0x00000000"
1128 config PHYSICAL_ALIGN
1130 default "0x04000000" if FSL_BOOKE
1132 This value puts the alignment restrictions on physical address
1133 where kernel is loaded and run from. Kernel is compiled for an
1134 address which meets above alignment restriction.
1136 config TASK_SIZE_BOOL
1137 bool "Set custom user task size"
1138 depends on ADVANCED_OPTIONS
1140 This option allows you to set the amount of virtual address space
1141 allocated to user tasks. This can be useful in optimizing the
1142 virtual memory layout of the system.
1144 Say N here unless you know what you are doing.
1147 hex "Size of user task space" if TASK_SIZE_BOOL
1148 default "0x80000000" if PPC_8xx
1149 default "0xc0000000"
1151 config CONSISTENT_SIZE_BOOL
1152 bool "Set custom consistent memory pool size"
1153 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1155 This option allows you to set the size of the
1156 consistent memory pool. This pool of virtual memory
1157 is used to make consistent memory allocations.
1159 config CONSISTENT_SIZE
1160 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1161 default "0x00200000" if NOT_COHERENT_CACHE
1164 bool "Pinned Kernel TLBs (860 ONLY)"
1165 depends on ADVANCED_OPTIONS && PPC_8xx && \
1166 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1169 bool "Pinned TLB for DATA"
1174 bool "Pinned TLB for IMMR"
1179 bool "Pinned TLB for TEXT"
1185 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1188 default "0xc000000000000000"
1191 default "0xc000000000000000"
1192 config PHYSICAL_START
1194 default "0x00000000"
1200 config PPC_LIB_RHEAP
1203 source "arch/powerpc/kvm/Kconfig"
1205 source "kernel/livepatch/Kconfig"