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 GENERIC_LOCKBREAK
109 depends on SMP && PREEMPT
111 config GENERIC_HWEIGHT
119 # Please keep this list sorted alphabetically.
121 select ARCH_32BIT_OFF_T if PPC32
122 select ARCH_HAS_DEBUG_VIRTUAL
123 select ARCH_HAS_DEVMEM_IS_ALLOWED
124 select ARCH_HAS_ELF_RANDOMIZE
125 select ARCH_HAS_FORTIFY_SOURCE
126 select ARCH_HAS_GCOV_PROFILE_ALL
128 select ARCH_HAS_MMIOWB if PPC64
129 select ARCH_HAS_PHYS_TO_DMA
130 select ARCH_HAS_PMEM_API if PPC64
131 select ARCH_HAS_PTE_SPECIAL
132 select ARCH_HAS_MEMBARRIER_CALLBACKS
133 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC64
134 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION)
135 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
136 select ARCH_HAS_UACCESS_FLUSHCACHE if PPC64
137 select ARCH_HAS_UBSAN_SANITIZE_ALL
138 select ARCH_HAS_ZONE_DEVICE if PPC_BOOK3S_64
139 select ARCH_HAVE_NMI_SAFE_CMPXCHG
140 select ARCH_KEEP_MEMBLOCK
141 select ARCH_MIGHT_HAVE_PC_PARPORT
142 select ARCH_MIGHT_HAVE_PC_SERIO
143 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
144 select ARCH_SUPPORTS_ATOMIC_RMW
145 select ARCH_USE_BUILTIN_BSWAP
146 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
147 select ARCH_WANT_IPC_PARSE_VERSION
148 select ARCH_WEAK_RELEASE_ACQUIRE
150 select BUILDTIME_EXTABLE_SORT
151 select CLONE_BACKWARDS
152 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
153 select DYNAMIC_FTRACE if FUNCTION_TRACER
154 select EDAC_ATOMIC_SCRUB
156 select GENERIC_ATOMIC64 if PPC32
157 select GENERIC_CLOCKEVENTS
158 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
159 select GENERIC_CMOS_UPDATE
160 select GENERIC_CPU_AUTOPROBE
161 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
162 select GENERIC_IRQ_SHOW
163 select GENERIC_IRQ_SHOW_LEVEL
164 select GENERIC_PCI_IOMAP if PCI
165 select GENERIC_SMP_IDLE_THREAD
166 select GENERIC_STRNCPY_FROM_USER
167 select GENERIC_STRNLEN_USER
168 select GENERIC_TIME_VSYSCALL
169 select HAVE_ARCH_AUDITSYSCALL
170 select HAVE_ARCH_JUMP_LABEL
171 select HAVE_ARCH_KASAN if PPC32
172 select HAVE_ARCH_KGDB
173 select HAVE_ARCH_MMAP_RND_BITS
174 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
175 select HAVE_ARCH_NVRAM_OPS
176 select HAVE_ARCH_SECCOMP_FILTER
177 select HAVE_ARCH_TRACEHOOK
178 select HAVE_CBPF_JIT if !PPC64
179 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
180 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
181 select HAVE_CONTEXT_TRACKING if PPC64
182 select HAVE_DEBUG_KMEMLEAK
183 select HAVE_DEBUG_STACKOVERFLOW
184 select HAVE_DYNAMIC_FTRACE
185 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
186 select HAVE_EBPF_JIT if PPC64
187 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
188 select HAVE_FTRACE_MCOUNT_RECORD
189 select HAVE_FUNCTION_ERROR_INJECTION
190 select HAVE_FUNCTION_GRAPH_TRACER
191 select HAVE_FUNCTION_TRACER
192 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
193 select HAVE_GENERIC_GUP
194 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
196 select HAVE_IOREMAP_PROT
197 select HAVE_IRQ_EXIT_ON_IRQ_STACK
198 select HAVE_KERNEL_GZIP
199 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
201 select HAVE_KPROBES_ON_FTRACE
202 select HAVE_KRETPROBES
203 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
204 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
205 select HAVE_MEMBLOCK_NODE_MAP
206 select HAVE_MOD_ARCH_SPECIFIC
207 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
208 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
210 select HAVE_OPTPROBES if PPC64
211 select HAVE_PERF_EVENTS
212 select HAVE_PERF_EVENTS_NMI if PPC64
213 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
214 select HAVE_PERF_REGS
215 select HAVE_PERF_USER_STACK_DUMP
216 select HAVE_RCU_TABLE_FREE if SMP
217 select HAVE_RCU_TABLE_NO_INVALIDATE if HAVE_RCU_TABLE_FREE
218 select HAVE_MMU_GATHER_PAGE_SIZE
219 select HAVE_REGS_AND_STACK_ACCESS_API
220 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && 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
232 select OF_EARLY_FLATTREE
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 THREAD_INFO_IN_TASK
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
262 select COMPAT_BINFMT_ELF
263 select ARCH_WANT_OLD_COMPAT_IPC
264 select COMPAT_OLD_SIGACTION
266 config SYSVIPC_COMPAT
268 depends on COMPAT && SYSVIPC
271 config SCHED_OMIT_FRAME_POINTER
275 config ARCH_MAY_HAVE_PC_FDC
279 config PPC_UDBG_16550
282 config GENERIC_TBSYNC
284 default y if PPC32 && SMP
295 config SYS_SUPPORTS_APM_EMULATION
296 default y if PMAC_APM_EMU
302 Used to allow a board to specify it wants an ePAPR compliant wrapper.
304 config DEFAULT_UIMAGE
307 Used to allow a board to specify it wants a uImage built by default
309 config ARCH_HIBERNATION_POSSIBLE
313 config ARCH_SUSPEND_POSSIBLE
315 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
316 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
319 config ARCH_SUSPEND_NONZERO_CPU
321 depends on PPC_POWERNV || PPC_PSERIES
323 config PPC_DCR_NATIVE
331 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
334 config PPC_OF_PLATFORM_PCI
337 depends on PPC64 # not supported on 32 bits yet
339 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
340 depends on PPC32 || PPC_BOOK3S_64
343 config ARCH_SUPPORTS_UPROBES
346 config PPC_ADV_DEBUG_REGS
348 depends on 40x || BOOKE
351 config PPC_ADV_DEBUG_IACS
353 depends on PPC_ADV_DEBUG_REGS
357 config PPC_ADV_DEBUG_DACS
359 depends on PPC_ADV_DEBUG_REGS
362 config PPC_ADV_DEBUG_DVCS
364 depends on PPC_ADV_DEBUG_REGS
368 config PPC_ADV_DEBUG_DAC_RANGE
370 depends on PPC_ADV_DEBUG_REGS && 44x
375 default y if PPC_BOOK3E_64
377 config PGTABLE_LEVELS
382 source "arch/powerpc/sysdev/Kconfig"
383 source "arch/powerpc/platforms/Kconfig"
385 menu "Kernel options"
388 bool "High memory support"
391 source "kernel/Kconfig.hz"
393 config HUGETLB_PAGE_SIZE_VARIABLE
395 depends on HUGETLB_PAGE && PPC_BOOK3S_64
398 config MATH_EMULATION
399 bool "Math emulation"
400 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
402 Some PowerPC chips designed for embedded applications do not have
403 a floating-point unit and therefore do not implement the
404 floating-point instructions in the PowerPC instruction set. If you
405 say Y here, the kernel will include code to emulate a floating-point
406 unit, which will allow programs that use floating-point
409 This is also useful to emulate missing (optional) instructions
410 such as fsqrt on cores that do have an FPU but do not implement
411 them (such as Freescale BookE).
414 prompt "Math emulation options"
415 default MATH_EMULATION_FULL
416 depends on MATH_EMULATION
418 config MATH_EMULATION_FULL
419 bool "Emulate all the floating point instructions"
421 Select this option will enable the kernel to support to emulate
422 all the floating point instructions. If your SoC doesn't have
423 a FPU, you should select this.
425 config MATH_EMULATION_HW_UNIMPLEMENTED
426 bool "Just emulate the FPU unimplemented instructions"
428 Select this if you know there does have a hardware FPU on your
429 SoC, but some floating point instructions are not implemented by that.
433 config PPC_TRANSACTIONAL_MEM
434 bool "Transactional Memory support for POWERPC"
435 depends on PPC_BOOK3S_64
440 Support user-mode Transactional Memory on POWERPC.
442 config LD_HEAD_STUB_CATCH
443 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
446 Very large kernels can cause linker branch stubs to be generated by
447 code in head_64.S, which moves the head text sections out of their
448 specified location. This option can work around the problem.
452 config MPROFILE_KERNEL
453 depends on PPC64 && CPU_LITTLE_ENDIAN
454 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
457 bool "Support for enabling/disabling CPUs"
458 depends on SMP && (PPC_PSERIES || \
459 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
461 Say Y here to be able to disable and re-enable individual
462 CPUs at runtime on SMP machines.
464 Say N if you are unsure.
466 config ARCH_CPU_PROBE_RELEASE
468 depends on HOTPLUG_CPU
470 config ARCH_ENABLE_MEMORY_HOTPLUG
473 config ARCH_ENABLE_MEMORY_HOTREMOVE
476 config PPC64_SUPPORTS_MEMORY_FAILURE
477 bool "Add support for memory hwpoison"
478 depends on PPC_BOOK3S_64
479 default "y" if PPC_POWERNV
480 select ARCH_SUPPORTS_MEMORY_FAILURE
483 bool "kexec system call"
484 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
487 kexec is a system call that implements the ability to shutdown your
488 current kernel, and to start another kernel. It is like a reboot
489 but it is independent of the system firmware. And like a reboot
490 you can start any kernel with it, not just Linux.
492 The name comes from the similarity to the exec system call.
494 It is an ongoing process to be certain the hardware in a machine
495 is properly shutdown, so do not be surprised if this code does not
496 initially work for you. As of this writing the exact hardware
497 interface is strongly in flux, so no good recommendation can be
501 bool "kexec file based system call"
503 select HAVE_IMA_KEXEC
507 depends on CRYPTO_SHA256=y
509 This is a new version of the kexec system call. This call is
510 file based and takes in file descriptors as system call arguments
511 for kernel and initramfs as opposed to a list of segments as is the
512 case for the older kexec call.
514 config ARCH_HAS_KEXEC_PURGATORY
518 bool "Build a relocatable kernel"
519 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
520 select NONSTATIC_KERNEL
521 select MODULE_REL_CRCS if MODVERSIONS
523 This builds a kernel image that is capable of running at the
524 location the kernel is loaded at. For ppc32, there is no any
525 alignment restrictions, and this feature is a superset of
526 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
527 16k-aligned base address. The kernel is linked as a
528 position-independent executable (PIE) and contains dynamic relocations
529 which are processed early in the bootup process.
531 One use is for the kexec on panic case where the recovery kernel
532 must live at a different physical address than the primary
535 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
536 it has been loaded at and the compile time physical addresses
537 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
538 setting can still be useful to bootwrappers that need to know the
539 load address of the kernel (eg. u-boot/mkimage).
541 config RELOCATABLE_TEST
542 bool "Test relocatable kernel"
543 depends on (PPC64 && RELOCATABLE)
545 This runs the relocatable kernel at the address it was initially
546 loaded at, which tends to be non-zero and therefore test the
550 bool "Build a dump capture kernel"
551 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
552 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
554 Build a kernel suitable for use as a dump capture kernel.
555 The same kernel binary can be used as production kernel and dump
559 bool "Firmware-assisted dump"
560 depends on PPC64 && PPC_RTAS
564 A robust mechanism to get reliable kernel crash dump with
565 assistance from firmware. This approach does not use kexec,
566 instead firmware assists in booting the capture kernel
567 while preserving memory contents. Firmware-assisted dump
568 is meant to be a kdump replacement offering robustness and
569 speed not possible without system firmware assistance.
574 bool "Distribute interrupts on all CPUs by default"
577 This option gives the kernel permission to distribute IRQs across
578 multiple CPUs. Saying N here will route all IRQs to the first
579 CPU. Generally saying Y is safe, although some problems have been
580 reported with SMP Power Macintoshes with this option enabled.
585 default y if SMP && PPC_PSERIES
591 depends on NEED_MULTIPLE_NODES
593 config USE_PERCPU_NUMA_NODE_ID
597 config HAVE_MEMORYLESS_NODES
601 config ARCH_SELECT_MEMORY_MODEL
605 config ARCH_FLATMEM_ENABLE
607 depends on (PPC64 && !NUMA) || PPC32
609 config ARCH_SPARSEMEM_ENABLE
612 select SPARSEMEM_VMEMMAP_ENABLE
614 config ARCH_SPARSEMEM_DEFAULT
616 depends on PPC_BOOK3S_64
618 config SYS_SUPPORTS_HUGETLBFS
621 config ILLEGAL_POINTER_VALUE
623 # This is roughly half way between the top of user space and the bottom
624 # of kernel space, which seems about as good as we can get.
625 default 0x5deadbeef0000000 if PPC64
628 config ARCH_MEMORY_PROBE
630 depends on MEMORY_HOTPLUG
632 # Some NUMA nodes have memory ranges that span
633 # other nodes. Even though a pfn is valid and
634 # between a node's start and end pfns, it may not
635 # reside on that node. See memmap_init_zone()
637 config NODES_SPAN_OTHER_NODES
639 depends on NEED_MULTIPLE_NODES
642 bool "Using standard binutils settings"
646 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
647 Note, that kernel will be able to run only those applications,
648 which had been compiled using binutils later than 2.17.50.0.3 with
649 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
650 the older binutils, you can patch them with a trivial patch, which
651 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
657 Select the kernel logical page size. Increasing the page size
658 will reduce software overhead at each page boundary, allow
659 hardware prefetch mechanisms to be more effective, and allow
660 larger dma transfers increasing IO efficiency and reducing
661 overhead. However the utilization of memory will increase.
662 For example, each cached file will using a multiple of the
663 page size to hold its contents and the difference between the
664 end of file and the end of page is wasted.
666 Some dedicated systems, such as software raid serving with
667 accelerated calculations, have shown significant increases.
669 If you configure a 64 bit kernel for 64k pages but the
670 processor does not support them, then the kernel will simulate
671 them with 4k pages, loading them on demand, but with the
672 reduced software overhead and larger internal fragmentation.
673 For the 32 bit kernel, a large page option will not be offered
674 unless it is supported by the configured processor.
676 If unsure, choose 4K_PAGES.
680 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
684 depends on 44x || PPC_8xx
688 depends on 44x || PPC_BOOK3S_64
689 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
691 config PPC_256K_PAGES
692 bool "256k page size"
693 depends on 44x && !STDBINUTILS
695 Make the page size 256k.
697 As the ELF standard only requires alignment to support page
698 sizes up to 64k, you will need to compile all of your user
699 space applications with a non-standard binutils settings
700 (see the STDBINUTILS description for details).
702 Say N unless you know what you are doing.
706 config PPC_PAGE_SHIFT
708 default 18 if PPC_256K_PAGES
709 default 16 if PPC_64K_PAGES
710 default 14 if PPC_16K_PAGES
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 ETEXT_SHIFT_BOOL
724 bool "Set custom etext alignment" if STRICT_KERNEL_RWX && \
725 (PPC_BOOK3S_32 || PPC_8xx)
726 depends on ADVANCED_OPTIONS
728 This option allows you to set the kernel end of text alignment. When
729 RAM is mapped by blocks, the alignment needs to fit the size and
730 number of possible blocks. The default should be OK for most configs.
732 Say N here unless you know what you are doing.
735 int "_etext shift" if ETEXT_SHIFT_BOOL
736 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
737 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
738 default 17 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
739 default 19 if STRICT_KERNEL_RWX && PPC_8xx
740 default PPC_PAGE_SHIFT
742 On Book3S 32 (603+), IBATs are used to map kernel text.
743 Smaller is the alignment, greater is the number of necessary IBATs.
745 On 8xx, large pages (512kb or 8M) are used to map kernel linear
746 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
749 config DATA_SHIFT_BOOL
750 bool "Set custom data alignment" if STRICT_KERNEL_RWX && \
751 (PPC_BOOK3S_32 || PPC_8xx)
752 depends on ADVANCED_OPTIONS
754 This option allows you to set the kernel data alignment. When
755 RAM is mapped by blocks, the alignment needs to fit the size and
756 number of possible blocks. The default should be OK for most configs.
758 Say N here unless you know what you are doing.
761 int "Data shift" if DATA_SHIFT_BOOL
762 default 24 if STRICT_KERNEL_RWX && PPC64
763 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
764 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
765 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
766 default 23 if STRICT_KERNEL_RWX && PPC_8xx
767 default PPC_PAGE_SHIFT
769 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
770 Smaller is the alignment, greater is the number of necessary DBATs.
772 On 8xx, large pages (512kb or 8M) are used to map kernel linear
773 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
776 config FORCE_MAX_ZONEORDER
777 int "Maximum zone order"
778 range 8 9 if PPC64 && PPC_64K_PAGES
779 default "9" if PPC64 && PPC_64K_PAGES
780 range 13 13 if PPC64 && !PPC_64K_PAGES
781 default "13" if PPC64 && !PPC_64K_PAGES
782 range 9 64 if PPC32 && PPC_16K_PAGES
783 default "9" if PPC32 && PPC_16K_PAGES
784 range 7 64 if PPC32 && PPC_64K_PAGES
785 default "7" if PPC32 && PPC_64K_PAGES
786 range 5 64 if PPC32 && PPC_256K_PAGES
787 default "5" if PPC32 && PPC_256K_PAGES
791 The kernel memory allocator divides physically contiguous memory
792 blocks into "zones", where each zone is a power of two number of
793 pages. This option selects the largest power of two that the kernel
794 keeps in the memory allocator. If you need to allocate very large
795 blocks of physically contiguous memory, then you may need to
798 This config option is actually maximum order plus one. For example,
799 a value of 11 means that the largest free memory block is 2^10 pages.
801 The page size is not necessarily 4KB. For example, on 64-bit
802 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
803 this in mind when choosing a value for this option.
805 config PPC_SUBPAGE_PROT
806 bool "Support setting protections for 4k subpages"
807 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
809 This option adds support for a system call to allow user programs
810 to set access permissions (read/write, readonly, or no access)
811 on the 4k subpages of each 64k page.
813 config PPC_COPRO_BASE
817 bool "SMT (Hyperthreading) scheduler support"
818 depends on PPC64 && SMP
820 SMT scheduler support improves the CPU scheduler's decision making
821 when dealing with POWER5 cpus at a cost of slightly increased
822 overhead in some places. If unsure say N here.
824 config PPC_DENORMALISATION
825 bool "PowerPC denormalisation exception handling"
826 depends on PPC_BOOK3S_64
827 default "y" if PPC_POWERNV
829 Add support for handling denormalisation of single precision
830 values. Useful for bare metal only. If unsure say Y here.
833 bool "Default bootloader kernel arguments"
836 string "Initial kernel command string" if CMDLINE_BOOL
837 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" if CMDLINE_BOOL
840 On some platforms, there is currently no way for the boot loader to
841 pass arguments to the kernel. For these platforms, you can supply
842 some command-line options at build time by entering them here. In
843 most cases you will need to specify the root device here.
846 bool "Always use the default kernel command string"
847 depends on CMDLINE_BOOL
849 Always use the default kernel command string, even if the boot
850 loader passes other arguments to the kernel.
851 This is useful if you cannot or don't want to change the
852 command-line options your boot loader passes to the kernel.
855 string "Additional default image types"
857 List additional targets to be built by the bootwrapper here (separated
858 by spaces). This is useful for targets that depend of device tree
859 files in the .dts directory.
861 Targets in this list will be build as part of the default build
862 target, or when the user does a 'make zImage' or a
863 'make zImage.initrd'.
865 If unsure, leave blank
867 config ARCH_WANTS_FREEZER_CONTROL
871 source "kernel/power/Kconfig"
874 bool "Enable seccomp to safely compute untrusted bytecode"
878 This kernel feature is useful for number crunching applications
879 that may need to compute untrusted bytecode during their
880 execution. By using pipes or other transports made available to
881 the process as file descriptors supporting the read/write
882 syscalls, it's possible to isolate those applications in
883 their own address space using seccomp. Once seccomp is
884 enabled via /proc/<pid>/seccomp, it cannot be disabled
885 and the task is only allowed to execute a few safe syscalls
886 defined by each seccomp mode.
888 If unsure, say Y. Only embedded should say N here.
891 prompt "PowerPC Memory Protection Keys"
893 depends on PPC_BOOK3S_64
894 select ARCH_USES_HIGH_VMA_FLAGS
895 select ARCH_HAS_PKEYS
897 Memory Protection Keys provides a mechanism for enforcing
898 page-based protections, but without requiring modification of the
899 page tables when an application changes protection domains.
901 For details, see Documentation/vm/protection-keys.rst
914 bool "Support for ISA-bus hardware"
918 Find out whether you have ISA slots on your motherboard. ISA is the
919 name of a bus system, i.e. the way the CPU talks to the other stuff
920 inside your box. If you have an Apple machine, say N here; if you
921 have an IBM RS/6000 or pSeries machine, say Y. If you have an
922 embedded board, consult your board documentation.
924 config GENERIC_ISA_DMA
926 depends on ISA_DMA_API
929 config PPC_INDIRECT_PCI
932 default y if 40x || 44x
942 select ARCH_HAS_DMA_SET_MASK
943 select PPC_INDIRECT_PCI
949 depends on SUSPEND && (PPC_85xx || PPC_86xx)
951 Freescale MPC85xx/MPC86xx power management controller support
952 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
957 depends on SUSPEND && (44x || 40x)
959 PPC4xx Clock Power Management (CPM) support (suspend/resume).
960 It also enables support for two different idle states (idle-wait
967 bool "Freescale Local Bus support"
969 Enables reporting of errors from the Freescale local bus
970 controller. Also contains some common code used by
971 drivers for specific local bus peripherals.
975 depends on PPC_83xx || QUICC_ENGINE || CPM2
977 Freescale General-purpose Timers support
981 depends on PCI && 8260
982 select PPC_INDIRECT_PCI
986 bool "Freescale Embedded SRIO Controller support"
987 depends on RAPIDIO = y && HAVE_RAPIDIO
990 Include support for RapidIO controller on Freescale embedded
991 processors (MPC8548, MPC8641, etc).
995 config NONSTATIC_KERNEL
998 menu "Advanced setup"
1001 config ADVANCED_OPTIONS
1002 bool "Prompt for advanced kernel configuration options"
1004 This option will enable prompting for a variety of advanced kernel
1005 configuration options. These options can cause the kernel to not
1006 work if they are set incorrectly, but can be used to optimize certain
1007 aspects of kernel memory management.
1009 Unless you know what you are doing, say N here.
1011 comment "Default settings for advanced configuration options are used"
1012 depends on !ADVANCED_OPTIONS
1014 config LOWMEM_SIZE_BOOL
1015 bool "Set maximum low memory"
1016 depends on ADVANCED_OPTIONS
1018 This option allows you to set the maximum amount of memory which
1019 will be used as "low memory", that is, memory which the kernel can
1020 access directly, without having to set up a kernel virtual mapping.
1021 This can be useful in optimizing the layout of kernel virtual
1024 Say N here unless you know what you are doing.
1027 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1028 default "0x30000000"
1030 config LOWMEM_CAM_NUM_BOOL
1031 bool "Set number of CAMs to use to map low memory"
1032 depends on ADVANCED_OPTIONS && FSL_BOOKE
1034 This option allows you to set the maximum number of CAM slots that
1035 will be used to map low memory. There are a limited number of slots
1036 available and even more limited number that will fit in the L1 MMU.
1037 However, using more entries will allow mapping more low memory. This
1038 can be useful in optimizing the layout of kernel virtual memory.
1040 Say N here unless you know what you are doing.
1042 config LOWMEM_CAM_NUM
1043 depends on FSL_BOOKE
1044 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1047 config DYNAMIC_MEMSTART
1048 bool "Enable page aligned dynamic load address for kernel"
1049 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1050 select NONSTATIC_KERNEL
1052 This option enables the kernel to be loaded at any page aligned
1053 physical address. The kernel creates a mapping from KERNELBASE to
1054 the address where the kernel is loaded. The page size here implies
1055 the TLB page size of the mapping for kernel on the particular platform.
1056 Please refer to the init code for finding the TLB page size.
1058 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1059 kernel image, where the only restriction is the page aligned kernel
1060 load address. When this option is enabled, the compile time physical
1061 address CONFIG_PHYSICAL_START is ignored.
1063 This option is overridden by CONFIG_RELOCATABLE
1065 config PAGE_OFFSET_BOOL
1066 bool "Set custom page offset address"
1067 depends on ADVANCED_OPTIONS
1069 This option allows you to set the kernel virtual address at which
1070 the kernel will map low memory. This can be useful in optimizing
1071 the virtual memory layout of the system.
1073 Say N here unless you know what you are doing.
1076 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1077 default "0xc0000000"
1079 config KERNEL_START_BOOL
1080 bool "Set custom kernel base address"
1081 depends on ADVANCED_OPTIONS
1083 This option allows you to set the kernel virtual address at which
1084 the kernel will be loaded. Normally this should match PAGE_OFFSET
1085 however there are times (like kdump) that one might not want them
1088 Say N here unless you know what you are doing.
1091 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1092 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1093 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1094 default "0xc0000000"
1096 config PHYSICAL_START_BOOL
1097 bool "Set physical address where the kernel is loaded"
1098 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1100 This gives the physical address where the kernel is loaded.
1102 Say N here unless you know what you are doing.
1104 config PHYSICAL_START
1105 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1106 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1107 default "0x00000000"
1109 config PHYSICAL_ALIGN
1111 default "0x04000000" if FSL_BOOKE
1113 This value puts the alignment restrictions on physical address
1114 where kernel is loaded and run from. Kernel is compiled for an
1115 address which meets above alignment restriction.
1117 config TASK_SIZE_BOOL
1118 bool "Set custom user task size"
1119 depends on ADVANCED_OPTIONS
1121 This option allows you to set the amount of virtual address space
1122 allocated to user tasks. This can be useful in optimizing the
1123 virtual memory layout of the system.
1125 Say N here unless you know what you are doing.
1128 hex "Size of user task space" if TASK_SIZE_BOOL
1129 default "0x80000000" if PPC_8xx
1130 default "0xc0000000"
1132 config CONSISTENT_SIZE_BOOL
1133 bool "Set custom consistent memory pool size"
1134 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1136 This option allows you to set the size of the
1137 consistent memory pool. This pool of virtual memory
1138 is used to make consistent memory allocations.
1140 config CONSISTENT_SIZE
1141 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1142 default "0x00200000" if NOT_COHERENT_CACHE
1145 bool "Pinned Kernel TLBs (860 ONLY)"
1146 depends on ADVANCED_OPTIONS && PPC_8xx && \
1147 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1150 bool "Pinned TLB for DATA"
1155 bool "Pinned TLB for IMMR"
1156 depends on PIN_TLB || PPC_EARLY_DEBUG_CPM
1160 bool "Pinned TLB for TEXT"
1166 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1169 default "0xc000000000000000"
1172 default "0xc000000000000000"
1173 config PHYSICAL_START
1175 default "0x00000000"
1181 config PPC_LIB_RHEAP
1184 source "arch/powerpc/kvm/Kconfig"
1186 source "kernel/livepatch/Kconfig"