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
126 # Please keep this list sorted alphabetically.
128 select ARCH_HAS_DEBUG_VIRTUAL
129 select ARCH_HAS_DEVMEM_IS_ALLOWED
130 select ARCH_HAS_ELF_RANDOMIZE
131 select ARCH_HAS_FORTIFY_SOURCE
132 select ARCH_HAS_GCOV_PROFILE_ALL
133 select ARCH_HAS_PHYS_TO_DMA
134 select ARCH_HAS_PMEM_API if PPC64
135 select ARCH_HAS_PTE_SPECIAL
136 select ARCH_HAS_MEMBARRIER_CALLBACKS
137 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC64
138 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION)
139 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
140 select ARCH_HAS_UACCESS_FLUSHCACHE if PPC64
141 select ARCH_HAS_UBSAN_SANITIZE_ALL
142 select ARCH_HAS_ZONE_DEVICE if PPC_BOOK3S_64
143 select ARCH_HAVE_NMI_SAFE_CMPXCHG
144 select ARCH_MIGHT_HAVE_PC_PARPORT
145 select ARCH_MIGHT_HAVE_PC_SERIO
146 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
147 select ARCH_SUPPORTS_ATOMIC_RMW
148 select ARCH_USE_BUILTIN_BSWAP
149 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
150 select ARCH_WANT_IPC_PARSE_VERSION
151 select ARCH_WEAK_RELEASE_ACQUIRE
153 select BUILDTIME_EXTABLE_SORT
154 select CLONE_BACKWARDS
155 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
156 select DYNAMIC_FTRACE if FUNCTION_TRACER
157 select EDAC_ATOMIC_SCRUB
159 select GENERIC_ATOMIC64 if PPC32
160 select GENERIC_CLOCKEVENTS
161 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
162 select GENERIC_CMOS_UPDATE
163 select GENERIC_CPU_AUTOPROBE
164 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
165 select GENERIC_IRQ_SHOW
166 select GENERIC_IRQ_SHOW_LEVEL
167 select GENERIC_PCI_IOMAP if PCI
168 select GENERIC_SMP_IDLE_THREAD
169 select GENERIC_STRNCPY_FROM_USER
170 select GENERIC_STRNLEN_USER
171 select GENERIC_TIME_VSYSCALL
172 select HAVE_ARCH_AUDITSYSCALL
173 select HAVE_ARCH_JUMP_LABEL
174 select HAVE_ARCH_KGDB
175 select HAVE_ARCH_MMAP_RND_BITS
176 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
177 select HAVE_ARCH_SECCOMP_FILTER
178 select HAVE_ARCH_TRACEHOOK
179 select HAVE_CBPF_JIT if !PPC64
180 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
181 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
182 select HAVE_CONTEXT_TRACKING if PPC64
183 select HAVE_DEBUG_KMEMLEAK
184 select HAVE_DEBUG_STACKOVERFLOW
185 select HAVE_DYNAMIC_FTRACE
186 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
187 select HAVE_EBPF_JIT if PPC64
188 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
189 select HAVE_FTRACE_MCOUNT_RECORD
190 select HAVE_FUNCTION_ERROR_INJECTION
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
206 select HAVE_MEMBLOCK_NODE_MAP
207 select HAVE_MOD_ARCH_SPECIFIC
208 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
209 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
211 select HAVE_OPTPROBES if PPC64
212 select HAVE_PERF_EVENTS
213 select HAVE_PERF_EVENTS_NMI if PPC64
214 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
215 select HAVE_PERF_REGS
216 select HAVE_PERF_USER_STACK_DUMP
217 select HAVE_RCU_TABLE_FREE if SMP
218 select HAVE_REGS_AND_STACK_ACCESS_API
219 select HAVE_RELIABLE_STACKTRACE if PPC64 && CPU_LITTLE_ENDIAN
220 select HAVE_SYSCALL_TRACEPOINTS
221 select HAVE_VIRT_CPU_ACCOUNTING
222 select HAVE_IRQ_TIME_ACCOUNTING
224 select IOMMU_HELPER if PPC64
226 select IRQ_FORCED_THREADING
227 select MODULES_USE_ELF_RELA
228 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
229 select NEED_SG_DMA_LENGTH
231 select OF_EARLY_FLATTREE
232 select OF_RESERVED_MEM
233 select OLD_SIGACTION if PPC32
234 select OLD_SIGSUSPEND
235 select PCI_DOMAINS if PCI
236 select PCI_SYSCALL if PCI
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
289 config GENERIC_TBSYNC
291 default y if PPC32 && SMP
302 config SYS_SUPPORTS_APM_EMULATION
303 default y if PMAC_APM_EMU
309 Used to allow a board to specify it wants an ePAPR compliant wrapper.
311 config DEFAULT_UIMAGE
314 Used to allow a board to specify it wants a uImage built by default
316 config ARCH_HIBERNATION_POSSIBLE
320 config ARCH_SUSPEND_POSSIBLE
322 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
323 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
326 config PPC_DCR_NATIVE
334 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
337 config PPC_OF_PLATFORM_PCI
340 depends on PPC64 # not supported on 32 bits yet
342 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
343 depends on PPC32 || PPC_BOOK3S_64
346 config ARCH_SUPPORTS_UPROBES
349 config PPC_ADV_DEBUG_REGS
351 depends on 40x || BOOKE
354 config PPC_ADV_DEBUG_IACS
356 depends on PPC_ADV_DEBUG_REGS
360 config PPC_ADV_DEBUG_DACS
362 depends on PPC_ADV_DEBUG_REGS
365 config PPC_ADV_DEBUG_DVCS
367 depends on PPC_ADV_DEBUG_REGS
371 config PPC_ADV_DEBUG_DAC_RANGE
373 depends on PPC_ADV_DEBUG_REGS && 44x
378 default y if PPC_BOOK3E_64
380 config PGTABLE_LEVELS
383 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
386 source "arch/powerpc/sysdev/Kconfig"
387 source "arch/powerpc/platforms/Kconfig"
389 menu "Kernel options"
392 bool "High memory support"
395 source "kernel/Kconfig.hz"
397 config HUGETLB_PAGE_SIZE_VARIABLE
399 depends on HUGETLB_PAGE
402 config MATH_EMULATION
403 bool "Math emulation"
404 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
406 Some PowerPC chips designed for embedded applications do not have
407 a floating-point unit and therefore do not implement the
408 floating-point instructions in the PowerPC instruction set. If you
409 say Y here, the kernel will include code to emulate a floating-point
410 unit, which will allow programs that use floating-point
413 This is also useful to emulate missing (optional) instructions
414 such as fsqrt on cores that do have an FPU but do not implement
415 them (such as Freescale BookE).
418 prompt "Math emulation options"
419 default MATH_EMULATION_FULL
420 depends on MATH_EMULATION
422 config MATH_EMULATION_FULL
423 bool "Emulate all the floating point instructions"
425 Select this option will enable the kernel to support to emulate
426 all the floating point instructions. If your SoC doesn't have
427 a FPU, you should select this.
429 config MATH_EMULATION_HW_UNIMPLEMENTED
430 bool "Just emulate the FPU unimplemented instructions"
432 Select this if you know there does have a hardware FPU on your
433 SoC, but some floating point instructions are not implemented by that.
437 config PPC_TRANSACTIONAL_MEM
438 bool "Transactional Memory support for POWERPC"
439 depends on PPC_BOOK3S_64
444 Support user-mode Transactional Memory on POWERPC.
446 config LD_HEAD_STUB_CATCH
447 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
450 Very large kernels can cause linker branch stubs to be generated by
451 code in head_64.S, which moves the head text sections out of their
452 specified location. This option can work around the problem.
456 config MPROFILE_KERNEL
457 depends on PPC64 && CPU_LITTLE_ENDIAN
458 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
461 bool "Support for enabling/disabling CPUs"
462 depends on SMP && (PPC_PSERIES || \
463 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
465 Say Y here to be able to disable and re-enable individual
466 CPUs at runtime on SMP machines.
468 Say N if you are unsure.
470 config ARCH_CPU_PROBE_RELEASE
472 depends on HOTPLUG_CPU
474 config ARCH_ENABLE_MEMORY_HOTPLUG
477 config ARCH_HAS_WALK_MEMORY
480 config ARCH_ENABLE_MEMORY_HOTREMOVE
483 config PPC64_SUPPORTS_MEMORY_FAILURE
484 bool "Add support for memory hwpoison"
485 depends on PPC_BOOK3S_64
486 default "y" if PPC_POWERNV
487 select ARCH_SUPPORTS_MEMORY_FAILURE
490 bool "kexec system call"
491 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
494 kexec is a system call that implements the ability to shutdown your
495 current kernel, and to start another kernel. It is like a reboot
496 but it is independent of the system firmware. And like a reboot
497 you can start any kernel with it, not just Linux.
499 The name comes from the similarity to the exec system call.
501 It is an ongoing process to be certain the hardware in a machine
502 is properly shutdown, so do not be surprised if this code does not
503 initially work for you. As of this writing the exact hardware
504 interface is strongly in flux, so no good recommendation can be
508 bool "kexec file based system call"
510 select HAVE_IMA_KEXEC
514 depends on CRYPTO_SHA256=y
516 This is a new version of the kexec system call. This call is
517 file based and takes in file descriptors as system call arguments
518 for kernel and initramfs as opposed to a list of segments as is the
519 case for the older kexec call.
521 config ARCH_HAS_KEXEC_PURGATORY
525 bool "Build a relocatable kernel"
526 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
527 select NONSTATIC_KERNEL
528 select MODULE_REL_CRCS if MODVERSIONS
530 This builds a kernel image that is capable of running at the
531 location the kernel is loaded at. For ppc32, there is no any
532 alignment restrictions, and this feature is a superset of
533 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
534 16k-aligned base address. The kernel is linked as a
535 position-independent executable (PIE) and contains dynamic relocations
536 which are processed early in the bootup process.
538 One use is for the kexec on panic case where the recovery kernel
539 must live at a different physical address than the primary
542 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
543 it has been loaded at and the compile time physical addresses
544 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
545 setting can still be useful to bootwrappers that need to know the
546 load address of the kernel (eg. u-boot/mkimage).
548 config RELOCATABLE_TEST
549 bool "Test relocatable kernel"
550 depends on (PPC64 && RELOCATABLE)
552 This runs the relocatable kernel at the address it was initially
553 loaded at, which tends to be non-zero and therefore test the
557 bool "Build a dump capture kernel"
558 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
559 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
561 Build a kernel suitable for use as a dump capture kernel.
562 The same kernel binary can be used as production kernel and dump
566 bool "Firmware-assisted dump"
567 depends on PPC64 && PPC_RTAS
571 A robust mechanism to get reliable kernel crash dump with
572 assistance from firmware. This approach does not use kexec,
573 instead firmware assists in booting the capture kernel
574 while preserving memory contents. Firmware-assisted dump
575 is meant to be a kdump replacement offering robustness and
576 speed not possible without system firmware assistance.
581 bool "Distribute interrupts on all CPUs by default"
584 This option gives the kernel permission to distribute IRQs across
585 multiple CPUs. Saying N here will route all IRQs to the first
586 CPU. Generally saying Y is safe, although some problems have been
587 reported with SMP Power Macintoshes with this option enabled.
592 default y if SMP && PPC_PSERIES
598 depends on NEED_MULTIPLE_NODES
600 config USE_PERCPU_NUMA_NODE_ID
604 config HAVE_MEMORYLESS_NODES
608 config ARCH_SELECT_MEMORY_MODEL
612 config ARCH_FLATMEM_ENABLE
614 depends on (PPC64 && !NUMA) || PPC32
616 config ARCH_SPARSEMEM_ENABLE
619 select SPARSEMEM_VMEMMAP_ENABLE
621 config ARCH_SPARSEMEM_DEFAULT
623 depends on PPC_BOOK3S_64
625 config SYS_SUPPORTS_HUGETLBFS
628 config ILLEGAL_POINTER_VALUE
630 # This is roughly half way between the top of user space and the bottom
631 # of kernel space, which seems about as good as we can get.
632 default 0x5deadbeef0000000 if PPC64
635 config ARCH_MEMORY_PROBE
637 depends on MEMORY_HOTPLUG
639 # Some NUMA nodes have memory ranges that span
640 # other nodes. Even though a pfn is valid and
641 # between a node's start and end pfns, it may not
642 # reside on that node. See memmap_init_zone()
644 config NODES_SPAN_OTHER_NODES
646 depends on NEED_MULTIPLE_NODES
649 bool "Using standard binutils settings"
653 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
654 Note, that kernel will be able to run only those applications,
655 which had been compiled using binutils later than 2.17.50.0.3 with
656 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
657 the older binutils, you can patch them with a trivial patch, which
658 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
664 Select the kernel logical page size. Increasing the page size
665 will reduce software overhead at each page boundary, allow
666 hardware prefetch mechanisms to be more effective, and allow
667 larger dma transfers increasing IO efficiency and reducing
668 overhead. However the utilization of memory will increase.
669 For example, each cached file will using a multiple of the
670 page size to hold its contents and the difference between the
671 end of file and the end of page is wasted.
673 Some dedicated systems, such as software raid serving with
674 accelerated calculations, have shown significant increases.
676 If you configure a 64 bit kernel for 64k pages but the
677 processor does not support them, then the kernel will simulate
678 them with 4k pages, loading them on demand, but with the
679 reduced software overhead and larger internal fragmentation.
680 For the 32 bit kernel, a large page option will not be offered
681 unless it is supported by the configured processor.
683 If unsure, choose 4K_PAGES.
687 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
691 depends on 44x || PPC_8xx
695 depends on !PPC_FSL_BOOK3E && (44x || PPC_BOOK3S_64 || PPC_BOOK3E_64)
696 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
698 config PPC_256K_PAGES
699 bool "256k page size"
700 depends on 44x && !STDBINUTILS
702 Make the page size 256k.
704 As the ELF standard only requires alignment to support page
705 sizes up to 64k, you will need to compile all of your user
706 space applications with a non-standard binutils settings
707 (see the STDBINUTILS description for details).
709 Say N unless you know what you are doing.
714 int "Thread shift" if EXPERT
716 default "15" if PPC_256K_PAGES
717 default "14" if PPC64
720 Used to define the stack size. The default is almost always what you
721 want. Only change this if you know what you are doing.
723 config FORCE_MAX_ZONEORDER
724 int "Maximum zone order"
725 range 8 9 if PPC64 && PPC_64K_PAGES
726 default "9" if PPC64 && PPC_64K_PAGES
727 range 13 13 if PPC64 && !PPC_64K_PAGES
728 default "13" if PPC64 && !PPC_64K_PAGES
729 range 9 64 if PPC32 && PPC_16K_PAGES
730 default "9" if PPC32 && PPC_16K_PAGES
731 range 7 64 if PPC32 && PPC_64K_PAGES
732 default "7" if PPC32 && PPC_64K_PAGES
733 range 5 64 if PPC32 && PPC_256K_PAGES
734 default "5" if PPC32 && PPC_256K_PAGES
738 The kernel memory allocator divides physically contiguous memory
739 blocks into "zones", where each zone is a power of two number of
740 pages. This option selects the largest power of two that the kernel
741 keeps in the memory allocator. If you need to allocate very large
742 blocks of physically contiguous memory, then you may need to
745 This config option is actually maximum order plus one. For example,
746 a value of 11 means that the largest free memory block is 2^10 pages.
748 The page size is not necessarily 4KB. For example, on 64-bit
749 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
750 this in mind when choosing a value for this option.
752 config PPC_SUBPAGE_PROT
753 bool "Support setting protections for 4k subpages"
754 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
756 This option adds support for a system call to allow user programs
757 to set access permissions (read/write, readonly, or no access)
758 on the 4k subpages of each 64k page.
760 config PPC_COPRO_BASE
764 bool "SMT (Hyperthreading) scheduler support"
765 depends on PPC64 && SMP
767 SMT scheduler support improves the CPU scheduler's decision making
768 when dealing with POWER5 cpus at a cost of slightly increased
769 overhead in some places. If unsure say N here.
771 config PPC_DENORMALISATION
772 bool "PowerPC denormalisation exception handling"
773 depends on PPC_BOOK3S_64
774 default "y" if PPC_POWERNV
776 Add support for handling denormalisation of single precision
777 values. Useful for bare metal only. If unsure say Y here.
780 bool "Default bootloader kernel arguments"
783 string "Initial kernel command string"
784 depends on CMDLINE_BOOL
785 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
787 On some platforms, there is currently no way for the boot loader to
788 pass arguments to the kernel. For these platforms, you can supply
789 some command-line options at build time by entering them here. In
790 most cases you will need to specify the root device here.
793 bool "Always use the default kernel command string"
794 depends on CMDLINE_BOOL
796 Always use the default kernel command string, even if the boot
797 loader passes other arguments to the kernel.
798 This is useful if you cannot or don't want to change the
799 command-line options your boot loader passes to the kernel.
802 string "Additional default image types"
804 List additional targets to be built by the bootwrapper here (separated
805 by spaces). This is useful for targets that depend of device tree
806 files in the .dts directory.
808 Targets in this list will be build as part of the default build
809 target, or when the user does a 'make zImage' or a
810 'make zImage.initrd'.
812 If unsure, leave blank
814 config ARCH_WANTS_FREEZER_CONTROL
818 source "kernel/power/Kconfig"
821 bool "Enable seccomp to safely compute untrusted bytecode"
825 This kernel feature is useful for number crunching applications
826 that may need to compute untrusted bytecode during their
827 execution. By using pipes or other transports made available to
828 the process as file descriptors supporting the read/write
829 syscalls, it's possible to isolate those applications in
830 their own address space using seccomp. Once seccomp is
831 enabled via /proc/<pid>/seccomp, it cannot be disabled
832 and the task is only allowed to execute a few safe syscalls
833 defined by each seccomp mode.
835 If unsure, say Y. Only embedded should say N here.
838 prompt "PowerPC Memory Protection Keys"
840 depends on PPC_BOOK3S_64
841 select ARCH_USES_HIGH_VMA_FLAGS
842 select ARCH_HAS_PKEYS
844 Memory Protection Keys provides a mechanism for enforcing
845 page-based protections, but without requiring modification of the
846 page tables when an application changes protection domains.
848 For details, see Documentation/vm/protection-keys.rst
861 bool "Support for ISA-bus hardware"
865 Find out whether you have ISA slots on your motherboard. ISA is the
866 name of a bus system, i.e. the way the CPU talks to the other stuff
867 inside your box. If you have an Apple machine, say N here; if you
868 have an IBM RS/6000 or pSeries machine, say Y. If you have an
869 embedded board, consult your board documentation.
871 config GENERIC_ISA_DMA
873 depends on ISA_DMA_API
876 config PPC_INDIRECT_PCI
879 default y if 40x || 44x
889 select ARCH_HAS_DMA_SET_MASK
890 select PPC_INDIRECT_PCI
896 depends on SUSPEND && (PPC_85xx || PPC_86xx)
898 Freescale MPC85xx/MPC86xx power management controller support
899 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
904 depends on SUSPEND && (44x || 40x)
906 PPC4xx Clock Power Management (CPM) support (suspend/resume).
907 It also enables support for two different idle states (idle-wait
914 bool "Freescale Local Bus support"
916 Enables reporting of errors from the Freescale local bus
917 controller. Also contains some common code used by
918 drivers for specific local bus peripherals.
922 depends on PPC_83xx || QUICC_ENGINE || CPM2
924 Freescale General-purpose Timers support
928 depends on PCI && 8260
929 select PPC_INDIRECT_PCI
933 bool "Freescale Embedded SRIO Controller support"
934 depends on RAPIDIO = y && HAVE_RAPIDIO
937 Include support for RapidIO controller on Freescale embedded
938 processors (MPC8548, MPC8641, etc).
942 config NONSTATIC_KERNEL
945 menu "Advanced setup"
948 config ADVANCED_OPTIONS
949 bool "Prompt for advanced kernel configuration options"
951 This option will enable prompting for a variety of advanced kernel
952 configuration options. These options can cause the kernel to not
953 work if they are set incorrectly, but can be used to optimize certain
954 aspects of kernel memory management.
956 Unless you know what you are doing, say N here.
958 comment "Default settings for advanced configuration options are used"
959 depends on !ADVANCED_OPTIONS
961 config LOWMEM_SIZE_BOOL
962 bool "Set maximum low memory"
963 depends on ADVANCED_OPTIONS
965 This option allows you to set the maximum amount of memory which
966 will be used as "low memory", that is, memory which the kernel can
967 access directly, without having to set up a kernel virtual mapping.
968 This can be useful in optimizing the layout of kernel virtual
971 Say N here unless you know what you are doing.
974 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
977 config LOWMEM_CAM_NUM_BOOL
978 bool "Set number of CAMs to use to map low memory"
979 depends on ADVANCED_OPTIONS && FSL_BOOKE
981 This option allows you to set the maximum number of CAM slots that
982 will be used to map low memory. There are a limited number of slots
983 available and even more limited number that will fit in the L1 MMU.
984 However, using more entries will allow mapping more low memory. This
985 can be useful in optimizing the layout of kernel virtual memory.
987 Say N here unless you know what you are doing.
989 config LOWMEM_CAM_NUM
991 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
994 config DYNAMIC_MEMSTART
995 bool "Enable page aligned dynamic load address for kernel"
996 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
997 select NONSTATIC_KERNEL
999 This option enables the kernel to be loaded at any page aligned
1000 physical address. The kernel creates a mapping from KERNELBASE to
1001 the address where the kernel is loaded. The page size here implies
1002 the TLB page size of the mapping for kernel on the particular platform.
1003 Please refer to the init code for finding the TLB page size.
1005 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1006 kernel image, where the only restriction is the page aligned kernel
1007 load address. When this option is enabled, the compile time physical
1008 address CONFIG_PHYSICAL_START is ignored.
1010 This option is overridden by CONFIG_RELOCATABLE
1012 config PAGE_OFFSET_BOOL
1013 bool "Set custom page offset address"
1014 depends on ADVANCED_OPTIONS
1016 This option allows you to set the kernel virtual address at which
1017 the kernel will map low memory. This can be useful in optimizing
1018 the virtual memory layout of the system.
1020 Say N here unless you know what you are doing.
1023 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1024 default "0xc0000000"
1026 config KERNEL_START_BOOL
1027 bool "Set custom kernel base address"
1028 depends on ADVANCED_OPTIONS
1030 This option allows you to set the kernel virtual address at which
1031 the kernel will be loaded. Normally this should match PAGE_OFFSET
1032 however there are times (like kdump) that one might not want them
1035 Say N here unless you know what you are doing.
1038 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1039 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1040 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1041 default "0xc0000000"
1043 config PHYSICAL_START_BOOL
1044 bool "Set physical address where the kernel is loaded"
1045 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1047 This gives the physical address where the kernel is loaded.
1049 Say N here unless you know what you are doing.
1051 config PHYSICAL_START
1052 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1053 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1054 default "0x00000000"
1056 config PHYSICAL_ALIGN
1058 default "0x04000000" if FSL_BOOKE
1060 This value puts the alignment restrictions on physical address
1061 where kernel is loaded and run from. Kernel is compiled for an
1062 address which meets above alignment restriction.
1064 config TASK_SIZE_BOOL
1065 bool "Set custom user task size"
1066 depends on ADVANCED_OPTIONS
1068 This option allows you to set the amount of virtual address space
1069 allocated to user tasks. This can be useful in optimizing the
1070 virtual memory layout of the system.
1072 Say N here unless you know what you are doing.
1075 hex "Size of user task space" if TASK_SIZE_BOOL
1076 default "0x80000000" if PPC_8xx
1077 default "0xc0000000"
1079 config CONSISTENT_SIZE_BOOL
1080 bool "Set custom consistent memory pool size"
1081 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1083 This option allows you to set the size of the
1084 consistent memory pool. This pool of virtual memory
1085 is used to make consistent memory allocations.
1087 config CONSISTENT_SIZE
1088 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1089 default "0x00200000" if NOT_COHERENT_CACHE
1092 bool "Pinned Kernel TLBs (860 ONLY)"
1093 depends on ADVANCED_OPTIONS && PPC_8xx && \
1094 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1097 bool "Pinned TLB for DATA"
1102 bool "Pinned TLB for IMMR"
1103 depends on PIN_TLB || PPC_EARLY_DEBUG_CPM
1107 bool "Pinned TLB for TEXT"
1113 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1116 default "0xc000000000000000"
1119 default "0xc000000000000000"
1120 config PHYSICAL_START
1122 default "0x00000000"
1128 config PPC_LIB_RHEAP
1131 source "arch/powerpc/kvm/Kconfig"
1133 source "kernel/livepatch/Kconfig"