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 && PPC64
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 PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
184 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
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_ERROR_INJECTION
194 select HAVE_FUNCTION_GRAPH_TRACER
195 select HAVE_FUNCTION_TRACER
196 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
197 select HAVE_GENERIC_GUP
198 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
200 select HAVE_IOREMAP_PROT
201 select HAVE_IRQ_EXIT_ON_IRQ_STACK
202 select HAVE_KERNEL_GZIP
203 select HAVE_KERNEL_XZ if PPC_BOOK3S
205 select HAVE_KPROBES_ON_FTRACE
206 select HAVE_KRETPROBES
207 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
208 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)
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
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
290 config GENERIC_TBSYNC
292 default y if PPC32 && SMP
303 config SYS_SUPPORTS_APM_EMULATION
304 default y if PMAC_APM_EMU
310 Used to allow a board to specify it wants an ePAPR compliant wrapper.
312 config DEFAULT_UIMAGE
315 Used to allow a board to specify it wants a uImage built by default
317 config ARCH_HIBERNATION_POSSIBLE
321 config ARCH_SUSPEND_POSSIBLE
323 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
324 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
327 config PPC_DCR_NATIVE
335 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
338 config PPC_OF_PLATFORM_PCI
341 depends on PPC64 # not supported on 32 bits yet
343 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
344 depends on PPC32 || PPC_BOOK3S_64
347 config ARCH_SUPPORTS_UPROBES
350 config PPC_ADV_DEBUG_REGS
352 depends on 40x || BOOKE
355 config PPC_ADV_DEBUG_IACS
357 depends on PPC_ADV_DEBUG_REGS
361 config PPC_ADV_DEBUG_DACS
363 depends on PPC_ADV_DEBUG_REGS
366 config PPC_ADV_DEBUG_DVCS
368 depends on PPC_ADV_DEBUG_REGS
372 config PPC_ADV_DEBUG_DAC_RANGE
374 depends on PPC_ADV_DEBUG_REGS && 44x
381 config PGTABLE_LEVELS
384 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
387 source "arch/powerpc/sysdev/Kconfig"
388 source "arch/powerpc/platforms/Kconfig"
390 menu "Kernel options"
393 bool "High memory support"
396 source kernel/Kconfig.hz
398 config HUGETLB_PAGE_SIZE_VARIABLE
400 depends on HUGETLB_PAGE
403 config MATH_EMULATION
404 bool "Math emulation"
405 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
407 Some PowerPC chips designed for embedded applications do not have
408 a floating-point unit and therefore do not implement the
409 floating-point instructions in the PowerPC instruction set. If you
410 say Y here, the kernel will include code to emulate a floating-point
411 unit, which will allow programs that use floating-point
414 This is also useful to emulate missing (optional) instructions
415 such as fsqrt on cores that do have an FPU but do not implement
416 them (such as Freescale BookE).
419 prompt "Math emulation options"
420 default MATH_EMULATION_FULL
421 depends on MATH_EMULATION
423 config MATH_EMULATION_FULL
424 bool "Emulate all the floating point instructions"
426 Select this option will enable the kernel to support to emulate
427 all the floating point instructions. If your SoC doesn't have
428 a FPU, you should select this.
430 config MATH_EMULATION_HW_UNIMPLEMENTED
431 bool "Just emulate the FPU unimplemented instructions"
433 Select this if you know there does have a hardware FPU on your
434 SoC, but some floating point instructions are not implemented by that.
438 config PPC_TRANSACTIONAL_MEM
439 bool "Transactional Memory support for POWERPC"
440 depends on PPC_BOOK3S_64
445 Support user-mode Transactional Memory on POWERPC.
447 config LD_HEAD_STUB_CATCH
448 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
451 Very large kernels can cause linker branch stubs to be generated by
452 code in head_64.S, which moves the head text sections out of their
453 specified location. This option can work around the problem.
457 config MPROFILE_KERNEL
458 depends on PPC64 && CPU_LITTLE_ENDIAN
459 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
462 bool "Support for enabling/disabling CPUs"
463 depends on SMP && (PPC_PSERIES || \
464 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
466 Say Y here to be able to disable and re-enable individual
467 CPUs at runtime on SMP machines.
469 Say N if you are unsure.
471 config ARCH_CPU_PROBE_RELEASE
473 depends on HOTPLUG_CPU
475 config ARCH_ENABLE_MEMORY_HOTPLUG
478 config ARCH_HAS_WALK_MEMORY
481 config ARCH_ENABLE_MEMORY_HOTREMOVE
484 config PPC64_SUPPORTS_MEMORY_FAILURE
485 bool "Add support for memory hwpoison"
486 depends on PPC_BOOK3S_64
487 default "y" if PPC_POWERNV
488 select ARCH_SUPPORTS_MEMORY_FAILURE
491 bool "kexec system call"
492 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
495 kexec is a system call that implements the ability to shutdown your
496 current kernel, and to start another kernel. It is like a reboot
497 but it is independent of the system firmware. And like a reboot
498 you can start any kernel with it, not just Linux.
500 The name comes from the similarity to the exec system call.
502 It is an ongoing process to be certain the hardware in a machine
503 is properly shutdown, so do not be surprised if this code does not
504 initially work for you. As of this writing the exact hardware
505 interface is strongly in flux, so no good recommendation can be
509 bool "kexec file based system call"
511 select HAVE_IMA_KEXEC
515 depends on CRYPTO_SHA256=y
517 This is a new version of the kexec system call. This call is
518 file based and takes in file descriptors as system call arguments
519 for kernel and initramfs as opposed to a list of segments as is the
520 case for the older kexec call.
522 config ARCH_HAS_KEXEC_PURGATORY
526 bool "Build a relocatable kernel"
527 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
528 select NONSTATIC_KERNEL
529 select MODULE_REL_CRCS if MODVERSIONS
531 This builds a kernel image that is capable of running at the
532 location the kernel is loaded at. For ppc32, there is no any
533 alignment restrictions, and this feature is a superset of
534 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
535 16k-aligned base address. The kernel is linked as a
536 position-independent executable (PIE) and contains dynamic relocations
537 which are processed early in the bootup process.
539 One use is for the kexec on panic case where the recovery kernel
540 must live at a different physical address than the primary
543 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
544 it has been loaded at and the compile time physical addresses
545 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
546 setting can still be useful to bootwrappers that need to know the
547 load address of the kernel (eg. u-boot/mkimage).
549 config RELOCATABLE_TEST
550 bool "Test relocatable kernel"
551 depends on (PPC64 && RELOCATABLE)
553 This runs the relocatable kernel at the address it was initially
554 loaded at, which tends to be non-zero and therefore test the
558 bool "Build a dump capture kernel"
559 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
560 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
562 Build a kernel suitable for use as a dump capture kernel.
563 The same kernel binary can be used as production kernel and dump
567 bool "Firmware-assisted dump"
568 depends on PPC64 && PPC_RTAS
572 A robust mechanism to get reliable kernel crash dump with
573 assistance from firmware. This approach does not use kexec,
574 instead firmware assists in booting the capture kernel
575 while preserving memory contents. Firmware-assisted dump
576 is meant to be a kdump replacement offering robustness and
577 speed not possible without system firmware assistance.
582 bool "Distribute interrupts on all CPUs by default"
585 This option gives the kernel permission to distribute IRQs across
586 multiple CPUs. Saying N here will route all IRQs to the first
587 CPU. Generally saying Y is safe, although some problems have been
588 reported with SMP Power Macintoshes with this option enabled.
593 default y if SMP && PPC_PSERIES
599 depends on NEED_MULTIPLE_NODES
601 config USE_PERCPU_NUMA_NODE_ID
605 config HAVE_MEMORYLESS_NODES
609 config ARCH_SELECT_MEMORY_MODEL
613 config ARCH_FLATMEM_ENABLE
615 depends on (PPC64 && !NUMA) || PPC32
617 config ARCH_SPARSEMEM_ENABLE
620 select SPARSEMEM_VMEMMAP_ENABLE
622 config ARCH_SPARSEMEM_DEFAULT
624 depends on PPC_BOOK3S_64
626 config SYS_SUPPORTS_HUGETLBFS
629 config ILLEGAL_POINTER_VALUE
631 # This is roughly half way between the top of user space and the bottom
632 # of kernel space, which seems about as good as we can get.
633 default 0x5deadbeef0000000 if PPC64
636 config ARCH_MEMORY_PROBE
638 depends on MEMORY_HOTPLUG
640 # Some NUMA nodes have memory ranges that span
641 # other nodes. Even though a pfn is valid and
642 # between a node's start and end pfns, it may not
643 # reside on that node. See memmap_init_zone()
645 config NODES_SPAN_OTHER_NODES
647 depends on NEED_MULTIPLE_NODES
650 bool "Using standard binutils settings"
654 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
655 Note, that kernel will be able to run only those applications,
656 which had been compiled using binutils later than 2.17.50.0.3 with
657 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
658 the older binutils, you can patch them with a trivial patch, which
659 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
665 Select the kernel logical page size. Increasing the page size
666 will reduce software overhead at each page boundary, allow
667 hardware prefetch mechanisms to be more effective, and allow
668 larger dma transfers increasing IO efficiency and reducing
669 overhead. However the utilization of memory will increase.
670 For example, each cached file will using a multiple of the
671 page size to hold its contents and the difference between the
672 end of file and the end of page is wasted.
674 Some dedicated systems, such as software raid serving with
675 accelerated calculations, have shown significant increases.
677 If you configure a 64 bit kernel for 64k pages but the
678 processor does not support them, then the kernel will simulate
679 them with 4k pages, loading them on demand, but with the
680 reduced software overhead and larger internal fragmentation.
681 For the 32 bit kernel, a large page option will not be offered
682 unless it is supported by the configured processor.
684 If unsure, choose 4K_PAGES.
688 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
692 depends on 44x || PPC_8xx
696 depends on !PPC_FSL_BOOK3E && (44x || PPC_BOOK3S_64 || PPC_BOOK3E_64)
697 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
699 config PPC_256K_PAGES
700 bool "256k page size"
701 depends on 44x && !STDBINUTILS
703 Make the page size 256k.
705 As the ELF standard only requires alignment to support page
706 sizes up to 64k, you will need to compile all of your user
707 space applications with a non-standard binutils settings
708 (see the STDBINUTILS description for details).
710 Say N unless you know what you are doing.
715 int "Thread shift" if EXPERT
717 default "15" if PPC_256K_PAGES
718 default "14" if PPC64
721 Used to define the stack size. The default is almost always what you
722 want. Only change this if you know what you are doing.
724 config FORCE_MAX_ZONEORDER
725 int "Maximum zone order"
726 range 8 9 if PPC64 && PPC_64K_PAGES
727 default "9" if PPC64 && PPC_64K_PAGES
728 range 13 13 if PPC64 && !PPC_64K_PAGES
729 default "13" if PPC64 && !PPC_64K_PAGES
730 range 9 64 if PPC32 && PPC_16K_PAGES
731 default "9" if PPC32 && PPC_16K_PAGES
732 range 7 64 if PPC32 && PPC_64K_PAGES
733 default "7" if PPC32 && PPC_64K_PAGES
734 range 5 64 if PPC32 && PPC_256K_PAGES
735 default "5" if PPC32 && PPC_256K_PAGES
739 The kernel memory allocator divides physically contiguous memory
740 blocks into "zones", where each zone is a power of two number of
741 pages. This option selects the largest power of two that the kernel
742 keeps in the memory allocator. If you need to allocate very large
743 blocks of physically contiguous memory, then you may need to
746 This config option is actually maximum order plus one. For example,
747 a value of 11 means that the largest free memory block is 2^10 pages.
749 The page size is not necessarily 4KB. For example, on 64-bit
750 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
751 this in mind when choosing a value for this option.
753 config PPC_SUBPAGE_PROT
754 bool "Support setting protections for 4k subpages"
755 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
757 This option adds support for a system call to allow user programs
758 to set access permissions (read/write, readonly, or no access)
759 on the 4k subpages of each 64k page.
761 config PPC_COPRO_BASE
765 bool "SMT (Hyperthreading) scheduler support"
766 depends on PPC64 && SMP
768 SMT scheduler support improves the CPU scheduler's decision making
769 when dealing with POWER5 cpus at a cost of slightly increased
770 overhead in some places. If unsure say N here.
772 config PPC_DENORMALISATION
773 bool "PowerPC denormalisation exception handling"
774 depends on PPC_BOOK3S_64
775 default "y" if PPC_POWERNV
777 Add support for handling denormalisation of single precision
778 values. Useful for bare metal only. If unsure say Y here.
781 bool "Default bootloader kernel arguments"
784 string "Initial kernel command string"
785 depends on CMDLINE_BOOL
786 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
788 On some platforms, there is currently no way for the boot loader to
789 pass arguments to the kernel. For these platforms, you can supply
790 some command-line options at build time by entering them here. In
791 most cases you will need to specify the root device here.
794 bool "Always use the default kernel command string"
795 depends on CMDLINE_BOOL
797 Always use the default kernel command string, even if the boot
798 loader passes other arguments to the kernel.
799 This is useful if you cannot or don't want to change the
800 command-line options your boot loader passes to the kernel.
803 string "Additional default image types"
805 List additional targets to be built by the bootwrapper here (separated
806 by spaces). This is useful for targets that depend of device tree
807 files in the .dts directory.
809 Targets in this list will be build as part of the default build
810 target, or when the user does a 'make zImage' or a
811 'make zImage.initrd'.
813 If unsure, leave blank
815 config ARCH_WANTS_FREEZER_CONTROL
819 source kernel/power/Kconfig
822 bool "Enable seccomp to safely compute untrusted bytecode"
826 This kernel feature is useful for number crunching applications
827 that may need to compute untrusted bytecode during their
828 execution. By using pipes or other transports made available to
829 the process as file descriptors supporting the read/write
830 syscalls, it's possible to isolate those applications in
831 their own address space using seccomp. Once seccomp is
832 enabled via /proc/<pid>/seccomp, it cannot be disabled
833 and the task is only allowed to execute a few safe syscalls
834 defined by each seccomp mode.
836 If unsure, say Y. Only embedded should say N here.
839 prompt "PowerPC Memory Protection Keys"
841 depends on PPC_BOOK3S_64
842 select ARCH_USES_HIGH_VMA_FLAGS
843 select ARCH_HAS_PKEYS
845 Memory Protection Keys provides a mechanism for enforcing
846 page-based protections, but without requiring modification of the
847 page tables when an application changes protection domains.
849 For details, see Documentation/vm/protection-keys.rst
862 bool "Support for ISA-bus hardware"
866 Find out whether you have ISA slots on your motherboard. ISA is the
867 name of a bus system, i.e. the way the CPU talks to the other stuff
868 inside your box. If you have an Apple machine, say N here; if you
869 have an IBM RS/6000 or pSeries machine, say Y. If you have an
870 embedded board, consult your board documentation.
876 config GENERIC_ISA_DMA
878 depends on ISA_DMA_API
881 config PPC_INDIRECT_PCI
884 default y if 40x || 44x
897 select PPC_INDIRECT_PCI
903 depends on SUSPEND && (PPC_85xx || PPC_86xx)
905 Freescale MPC85xx/MPC86xx power management controller support
906 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
911 depends on SUSPEND && (44x || 40x)
913 PPC4xx Clock Power Management (CPM) support (suspend/resume).
914 It also enables support for two different idle states (idle-wait
921 bool "Freescale Local Bus support"
923 Enables reporting of errors from the Freescale local bus
924 controller. Also contains some common code used by
925 drivers for specific local bus peripherals.
929 depends on PPC_83xx || QUICC_ENGINE || CPM2
931 Freescale General-purpose Timers support
933 # Platforms that what PCI turned unconditionally just do select PCI
934 # in their config node. Platforms that want to choose at config
935 # time should select PPC_PCI_CHOICE
936 config PPC_PCI_CHOICE
940 bool "PCI support" if PPC_PCI_CHOICE
941 default y if !40x && !CPM2 && !PPC_8xx && !PPC_83xx \
942 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
943 select GENERIC_PCI_IOMAP
945 Find out whether your system includes a PCI bus. PCI is the name of
946 a bus system, i.e. the way the CPU talks to the other stuff inside
947 your box. If you say Y here, the kernel will include drivers and
948 infrastructure code to support PCI bus devices.
958 depends on PCI && 8260
959 select PPC_INDIRECT_PCI
962 source "drivers/pci/Kconfig"
964 source "drivers/pcmcia/Kconfig"
970 tristate "RapidIO support"
971 depends on HAS_RAPIDIO || PCI
973 If you say Y here, the kernel will include drivers and
974 infrastructure code to support RapidIO interconnect devices.
977 bool "Freescale Embedded SRIO Controller support"
978 depends on RAPIDIO = y && HAS_RAPIDIO
981 Include support for RapidIO controller on Freescale embedded
982 processors (MPC8548, MPC8641, etc).
984 source "drivers/rapidio/Kconfig"
988 config NONSTATIC_KERNEL
991 menu "Advanced setup"
994 config ADVANCED_OPTIONS
995 bool "Prompt for advanced kernel configuration options"
997 This option will enable prompting for a variety of advanced kernel
998 configuration options. These options can cause the kernel to not
999 work if they are set incorrectly, but can be used to optimize certain
1000 aspects of kernel memory management.
1002 Unless you know what you are doing, say N here.
1004 comment "Default settings for advanced configuration options are used"
1005 depends on !ADVANCED_OPTIONS
1007 config LOWMEM_SIZE_BOOL
1008 bool "Set maximum low memory"
1009 depends on ADVANCED_OPTIONS
1011 This option allows you to set the maximum amount of memory which
1012 will be used as "low memory", that is, memory which the kernel can
1013 access directly, without having to set up a kernel virtual mapping.
1014 This can be useful in optimizing the layout of kernel virtual
1017 Say N here unless you know what you are doing.
1020 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1021 default "0x30000000"
1023 config LOWMEM_CAM_NUM_BOOL
1024 bool "Set number of CAMs to use to map low memory"
1025 depends on ADVANCED_OPTIONS && FSL_BOOKE
1027 This option allows you to set the maximum number of CAM slots that
1028 will be used to map low memory. There are a limited number of slots
1029 available and even more limited number that will fit in the L1 MMU.
1030 However, using more entries will allow mapping more low memory. This
1031 can be useful in optimizing the layout of kernel virtual memory.
1033 Say N here unless you know what you are doing.
1035 config LOWMEM_CAM_NUM
1036 depends on FSL_BOOKE
1037 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1040 config DYNAMIC_MEMSTART
1041 bool "Enable page aligned dynamic load address for kernel"
1042 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1043 select NONSTATIC_KERNEL
1045 This option enables the kernel to be loaded at any page aligned
1046 physical address. The kernel creates a mapping from KERNELBASE to
1047 the address where the kernel is loaded. The page size here implies
1048 the TLB page size of the mapping for kernel on the particular platform.
1049 Please refer to the init code for finding the TLB page size.
1051 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1052 kernel image, where the only restriction is the page aligned kernel
1053 load address. When this option is enabled, the compile time physical
1054 address CONFIG_PHYSICAL_START is ignored.
1056 This option is overridden by CONFIG_RELOCATABLE
1058 config PAGE_OFFSET_BOOL
1059 bool "Set custom page offset address"
1060 depends on ADVANCED_OPTIONS
1062 This option allows you to set the kernel virtual address at which
1063 the kernel will map low memory. This can be useful in optimizing
1064 the virtual memory layout of the system.
1066 Say N here unless you know what you are doing.
1069 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1070 default "0xc0000000"
1072 config KERNEL_START_BOOL
1073 bool "Set custom kernel base address"
1074 depends on ADVANCED_OPTIONS
1076 This option allows you to set the kernel virtual address at which
1077 the kernel will be loaded. Normally this should match PAGE_OFFSET
1078 however there are times (like kdump) that one might not want them
1081 Say N here unless you know what you are doing.
1084 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1085 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1086 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1087 default "0xc0000000"
1089 config PHYSICAL_START_BOOL
1090 bool "Set physical address where the kernel is loaded"
1091 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1093 This gives the physical address where the kernel is loaded.
1095 Say N here unless you know what you are doing.
1097 config PHYSICAL_START
1098 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1099 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1100 default "0x00000000"
1102 config PHYSICAL_ALIGN
1104 default "0x04000000" if FSL_BOOKE
1106 This value puts the alignment restrictions on physical address
1107 where kernel is loaded and run from. Kernel is compiled for an
1108 address which meets above alignment restriction.
1110 config TASK_SIZE_BOOL
1111 bool "Set custom user task size"
1112 depends on ADVANCED_OPTIONS
1114 This option allows you to set the amount of virtual address space
1115 allocated to user tasks. This can be useful in optimizing the
1116 virtual memory layout of the system.
1118 Say N here unless you know what you are doing.
1121 hex "Size of user task space" if TASK_SIZE_BOOL
1122 default "0x80000000" if PPC_8xx
1123 default "0xc0000000"
1125 config CONSISTENT_SIZE_BOOL
1126 bool "Set custom consistent memory pool size"
1127 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1129 This option allows you to set the size of the
1130 consistent memory pool. This pool of virtual memory
1131 is used to make consistent memory allocations.
1133 config CONSISTENT_SIZE
1134 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1135 default "0x00200000" if NOT_COHERENT_CACHE
1138 bool "Pinned Kernel TLBs (860 ONLY)"
1139 depends on ADVANCED_OPTIONS && PPC_8xx && \
1140 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1143 bool "Pinned TLB for DATA"
1148 bool "Pinned TLB for IMMR"
1153 bool "Pinned TLB for TEXT"
1159 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1162 default "0xc000000000000000"
1165 default "0xc000000000000000"
1166 config PHYSICAL_START
1168 default "0x00000000"
1174 config PPC_LIB_RHEAP
1177 source "arch/powerpc/kvm/Kconfig"
1179 source "kernel/livepatch/Kconfig"