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_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
171 select HAVE_ARCH_JUMP_LABEL
172 select HAVE_ARCH_KASAN if PPC32
173 select HAVE_ARCH_KGDB
174 select HAVE_ARCH_MMAP_RND_BITS
175 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
176 select HAVE_ARCH_NVRAM_OPS
177 select HAVE_ARCH_SECCOMP_FILTER
178 select HAVE_ARCH_TRACEHOOK
179 select HAVE_C_RECORDMCOUNT
180 select HAVE_CBPF_JIT if !PPC64
181 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
182 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
183 select HAVE_CONTEXT_TRACKING if PPC64
184 select HAVE_DEBUG_KMEMLEAK
185 select HAVE_DEBUG_STACKOVERFLOW
186 select HAVE_DYNAMIC_FTRACE
187 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
188 select HAVE_EBPF_JIT if PPC64
189 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
190 select HAVE_FTRACE_MCOUNT_RECORD
191 select HAVE_FUNCTION_ERROR_INJECTION
192 select HAVE_FUNCTION_GRAPH_TRACER
193 select HAVE_FUNCTION_TRACER
194 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
195 select HAVE_GENERIC_GUP
196 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
198 select HAVE_IOREMAP_PROT
199 select HAVE_IRQ_EXIT_ON_IRQ_STACK
200 select HAVE_KERNEL_GZIP
201 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
203 select HAVE_KPROBES_ON_FTRACE
204 select HAVE_KRETPROBES
205 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
206 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
207 select HAVE_MEMBLOCK_NODE_MAP
208 select HAVE_MOD_ARCH_SPECIFIC
209 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
210 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
212 select HAVE_OPTPROBES if PPC64
213 select HAVE_PERF_EVENTS
214 select HAVE_PERF_EVENTS_NMI if PPC64
215 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
216 select HAVE_PERF_REGS
217 select HAVE_PERF_USER_STACK_DUMP
218 select HAVE_RCU_TABLE_FREE if SMP
219 select HAVE_RCU_TABLE_NO_INVALIDATE if HAVE_RCU_TABLE_FREE
220 select HAVE_MMU_GATHER_PAGE_SIZE
221 select HAVE_REGS_AND_STACK_ACCESS_API
222 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && 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 OLD_SIGACTION if PPC32
236 select OLD_SIGSUSPEND
237 select PCI_DOMAINS if PCI
238 select PCI_SYSCALL if PCI
239 select PPC_DAWR if PPC64
242 select SYSCTL_EXCEPTION_TRACE
243 select THREAD_INFO_IN_TASK
244 select VIRT_TO_BUS if !PPC64
246 # Please keep this list sorted alphabetically.
249 config PPC_BARRIER_NOSPEC
252 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 config SCHED_OMIT_FRAME_POINTER
278 config ARCH_MAY_HAVE_PC_FDC
282 config PPC_UDBG_16550
285 config GENERIC_TBSYNC
287 default y if PPC32 && SMP
298 config SYS_SUPPORTS_APM_EMULATION
299 default y if PMAC_APM_EMU
305 Used to allow a board to specify it wants an ePAPR compliant wrapper.
307 config DEFAULT_UIMAGE
310 Used to allow a board to specify it wants a uImage built by default
312 config ARCH_HIBERNATION_POSSIBLE
316 config ARCH_SUSPEND_POSSIBLE
318 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
319 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
322 config ARCH_SUSPEND_NONZERO_CPU
324 depends on PPC_POWERNV || 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
381 default y if PPC_BOOK3E_64
383 config PGTABLE_LEVELS
388 source "arch/powerpc/sysdev/Kconfig"
389 source "arch/powerpc/platforms/Kconfig"
391 menu "Kernel options"
394 bool "High memory support"
397 source "kernel/Kconfig.hz"
399 config HUGETLB_PAGE_SIZE_VARIABLE
401 depends on HUGETLB_PAGE && PPC_BOOK3S_64
404 config MATH_EMULATION
405 bool "Math emulation"
406 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
408 Some PowerPC chips designed for embedded applications do not have
409 a floating-point unit and therefore do not implement the
410 floating-point instructions in the PowerPC instruction set. If you
411 say Y here, the kernel will include code to emulate a floating-point
412 unit, which will allow programs that use floating-point
415 This is also useful to emulate missing (optional) instructions
416 such as fsqrt on cores that do have an FPU but do not implement
417 them (such as Freescale BookE).
420 prompt "Math emulation options"
421 default MATH_EMULATION_FULL
422 depends on MATH_EMULATION
424 config MATH_EMULATION_FULL
425 bool "Emulate all the floating point instructions"
427 Select this option will enable the kernel to support to emulate
428 all the floating point instructions. If your SoC doesn't have
429 a FPU, you should select this.
431 config MATH_EMULATION_HW_UNIMPLEMENTED
432 bool "Just emulate the FPU unimplemented instructions"
434 Select this if you know there does have a hardware FPU on your
435 SoC, but some floating point instructions are not implemented by that.
439 config PPC_TRANSACTIONAL_MEM
440 bool "Transactional Memory support for POWERPC"
441 depends on PPC_BOOK3S_64
446 Support user-mode Transactional Memory on POWERPC.
448 config LD_HEAD_STUB_CATCH
449 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
452 Very large kernels can cause linker branch stubs to be generated by
453 code in head_64.S, which moves the head text sections out of their
454 specified location. This option can work around the problem.
458 config MPROFILE_KERNEL
459 depends on PPC64 && CPU_LITTLE_ENDIAN
460 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
463 bool "Support for enabling/disabling CPUs"
464 depends on SMP && (PPC_PSERIES || \
465 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
467 Say Y here to be able to disable and re-enable individual
468 CPUs at runtime on SMP machines.
470 Say N if you are unsure.
472 config ARCH_CPU_PROBE_RELEASE
474 depends on HOTPLUG_CPU
476 config ARCH_ENABLE_MEMORY_HOTPLUG
479 config ARCH_ENABLE_MEMORY_HOTREMOVE
482 config PPC64_SUPPORTS_MEMORY_FAILURE
483 bool "Add support for memory hwpoison"
484 depends on PPC_BOOK3S_64
485 default "y" if PPC_POWERNV
486 select ARCH_SUPPORTS_MEMORY_FAILURE
489 bool "kexec system call"
490 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
493 kexec is a system call that implements the ability to shutdown your
494 current kernel, and to start another kernel. It is like a reboot
495 but it is independent of the system firmware. And like a reboot
496 you can start any kernel with it, not just Linux.
498 The name comes from the similarity to the exec system call.
500 It is an ongoing process to be certain the hardware in a machine
501 is properly shutdown, so do not be surprised if this code does not
502 initially work for you. As of this writing the exact hardware
503 interface is strongly in flux, so no good recommendation can be
507 bool "kexec file based system call"
509 select HAVE_IMA_KEXEC
513 depends on CRYPTO_SHA256=y
515 This is a new version of the kexec system call. This call is
516 file based and takes in file descriptors as system call arguments
517 for kernel and initramfs as opposed to a list of segments as is the
518 case for the older kexec call.
520 config ARCH_HAS_KEXEC_PURGATORY
524 bool "Build a relocatable kernel"
525 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
526 select NONSTATIC_KERNEL
527 select MODULE_REL_CRCS if MODVERSIONS
529 This builds a kernel image that is capable of running at the
530 location the kernel is loaded at. For ppc32, there is no any
531 alignment restrictions, and this feature is a superset of
532 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
533 16k-aligned base address. The kernel is linked as a
534 position-independent executable (PIE) and contains dynamic relocations
535 which are processed early in the bootup process.
537 One use is for the kexec on panic case where the recovery kernel
538 must live at a different physical address than the primary
541 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
542 it has been loaded at and the compile time physical addresses
543 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
544 setting can still be useful to bootwrappers that need to know the
545 load address of the kernel (eg. u-boot/mkimage).
547 config RELOCATABLE_TEST
548 bool "Test relocatable kernel"
549 depends on (PPC64 && RELOCATABLE)
551 This runs the relocatable kernel at the address it was initially
552 loaded at, which tends to be non-zero and therefore test the
556 bool "Build a dump capture kernel"
557 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
558 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
560 Build a kernel suitable for use as a dump capture kernel.
561 The same kernel binary can be used as production kernel and dump
565 bool "Firmware-assisted dump"
566 depends on PPC64 && PPC_RTAS
570 A robust mechanism to get reliable kernel crash dump with
571 assistance from firmware. This approach does not use kexec,
572 instead firmware assists in booting the capture kernel
573 while preserving memory contents. Firmware-assisted dump
574 is meant to be a kdump replacement offering robustness and
575 speed not possible without system firmware assistance.
580 bool "Distribute interrupts on all CPUs by default"
583 This option gives the kernel permission to distribute IRQs across
584 multiple CPUs. Saying N here will route all IRQs to the first
585 CPU. Generally saying Y is safe, although some problems have been
586 reported with SMP Power Macintoshes with this option enabled.
591 default y if SMP && PPC_PSERIES
597 depends on NEED_MULTIPLE_NODES
599 config USE_PERCPU_NUMA_NODE_ID
603 config HAVE_MEMORYLESS_NODES
607 config ARCH_SELECT_MEMORY_MODEL
611 config ARCH_FLATMEM_ENABLE
613 depends on (PPC64 && !NUMA) || PPC32
615 config ARCH_SPARSEMEM_ENABLE
618 select SPARSEMEM_VMEMMAP_ENABLE
620 config ARCH_SPARSEMEM_DEFAULT
622 depends on PPC_BOOK3S_64
624 config SYS_SUPPORTS_HUGETLBFS
627 config ILLEGAL_POINTER_VALUE
629 # This is roughly half way between the top of user space and the bottom
630 # of kernel space, which seems about as good as we can get.
631 default 0x5deadbeef0000000 if PPC64
634 config ARCH_MEMORY_PROBE
636 depends on MEMORY_HOTPLUG
638 # Some NUMA nodes have memory ranges that span
639 # other nodes. Even though a pfn is valid and
640 # between a node's start and end pfns, it may not
641 # reside on that node. See memmap_init_zone()
643 config NODES_SPAN_OTHER_NODES
645 depends on NEED_MULTIPLE_NODES
648 bool "Using standard binutils settings"
652 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
653 Note, that kernel will be able to run only those applications,
654 which had been compiled using binutils later than 2.17.50.0.3 with
655 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
656 the older binutils, you can patch them with a trivial patch, which
657 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
663 Select the kernel logical page size. Increasing the page size
664 will reduce software overhead at each page boundary, allow
665 hardware prefetch mechanisms to be more effective, and allow
666 larger dma transfers increasing IO efficiency and reducing
667 overhead. However the utilization of memory will increase.
668 For example, each cached file will using a multiple of the
669 page size to hold its contents and the difference between the
670 end of file and the end of page is wasted.
672 Some dedicated systems, such as software raid serving with
673 accelerated calculations, have shown significant increases.
675 If you configure a 64 bit kernel for 64k pages but the
676 processor does not support them, then the kernel will simulate
677 them with 4k pages, loading them on demand, but with the
678 reduced software overhead and larger internal fragmentation.
679 For the 32 bit kernel, a large page option will not be offered
680 unless it is supported by the configured processor.
682 If unsure, choose 4K_PAGES.
686 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
690 depends on 44x || PPC_8xx
694 depends on 44x || PPC_BOOK3S_64
695 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
697 config PPC_256K_PAGES
698 bool "256k page size"
699 depends on 44x && !STDBINUTILS
701 Make the page size 256k.
703 As the ELF standard only requires alignment to support page
704 sizes up to 64k, you will need to compile all of your user
705 space applications with a non-standard binutils settings
706 (see the STDBINUTILS description for details).
708 Say N unless you know what you are doing.
712 config PPC_PAGE_SHIFT
714 default 18 if PPC_256K_PAGES
715 default 16 if PPC_64K_PAGES
716 default 14 if PPC_16K_PAGES
720 int "Thread shift" if EXPERT
722 default "15" if PPC_256K_PAGES
723 default "14" if PPC64
726 Used to define the stack size. The default is almost always what you
727 want. Only change this if you know what you are doing.
729 config ETEXT_SHIFT_BOOL
730 bool "Set custom etext alignment" if STRICT_KERNEL_RWX && \
731 (PPC_BOOK3S_32 || PPC_8xx)
732 depends on ADVANCED_OPTIONS
734 This option allows you to set the kernel end of text alignment. When
735 RAM is mapped by blocks, the alignment needs to fit the size and
736 number of possible blocks. The default should be OK for most configs.
738 Say N here unless you know what you are doing.
741 int "_etext shift" if ETEXT_SHIFT_BOOL
742 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
743 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
744 default 17 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
745 default 19 if STRICT_KERNEL_RWX && PPC_8xx
746 default PPC_PAGE_SHIFT
748 On Book3S 32 (603+), IBATs are used to map kernel text.
749 Smaller is the alignment, greater is the number of necessary IBATs.
751 On 8xx, large pages (512kb or 8M) are used to map kernel linear
752 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
755 config DATA_SHIFT_BOOL
756 bool "Set custom data alignment" if STRICT_KERNEL_RWX && \
757 (PPC_BOOK3S_32 || PPC_8xx)
758 depends on ADVANCED_OPTIONS
760 This option allows you to set the kernel data alignment. When
761 RAM is mapped by blocks, the alignment needs to fit the size and
762 number of possible blocks. The default should be OK for most configs.
764 Say N here unless you know what you are doing.
767 int "Data shift" if DATA_SHIFT_BOOL
768 default 24 if STRICT_KERNEL_RWX && PPC64
769 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
770 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
771 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
772 default 23 if STRICT_KERNEL_RWX && PPC_8xx
773 default PPC_PAGE_SHIFT
775 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
776 Smaller is the alignment, greater is the number of necessary DBATs.
778 On 8xx, large pages (512kb or 8M) are used to map kernel linear
779 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
782 config FORCE_MAX_ZONEORDER
783 int "Maximum zone order"
784 range 8 9 if PPC64 && PPC_64K_PAGES
785 default "9" if PPC64 && PPC_64K_PAGES
786 range 13 13 if PPC64 && !PPC_64K_PAGES
787 default "13" if PPC64 && !PPC_64K_PAGES
788 range 9 64 if PPC32 && PPC_16K_PAGES
789 default "9" if PPC32 && PPC_16K_PAGES
790 range 7 64 if PPC32 && PPC_64K_PAGES
791 default "7" if PPC32 && PPC_64K_PAGES
792 range 5 64 if PPC32 && PPC_256K_PAGES
793 default "5" if PPC32 && PPC_256K_PAGES
797 The kernel memory allocator divides physically contiguous memory
798 blocks into "zones", where each zone is a power of two number of
799 pages. This option selects the largest power of two that the kernel
800 keeps in the memory allocator. If you need to allocate very large
801 blocks of physically contiguous memory, then you may need to
804 This config option is actually maximum order plus one. For example,
805 a value of 11 means that the largest free memory block is 2^10 pages.
807 The page size is not necessarily 4KB. For example, on 64-bit
808 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
809 this in mind when choosing a value for this option.
811 config PPC_SUBPAGE_PROT
812 bool "Support setting protections for 4k subpages"
813 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
815 This option adds support for a system call to allow user programs
816 to set access permissions (read/write, readonly, or no access)
817 on the 4k subpages of each 64k page.
819 config PPC_COPRO_BASE
823 bool "SMT (Hyperthreading) scheduler support"
824 depends on PPC64 && SMP
826 SMT scheduler support improves the CPU scheduler's decision making
827 when dealing with POWER5 cpus at a cost of slightly increased
828 overhead in some places. If unsure say N here.
830 config PPC_DENORMALISATION
831 bool "PowerPC denormalisation exception handling"
832 depends on PPC_BOOK3S_64
833 default "y" if PPC_POWERNV
835 Add support for handling denormalisation of single precision
836 values. Useful for bare metal only. If unsure say Y here.
839 bool "Default bootloader kernel arguments"
842 string "Initial kernel command string" if CMDLINE_BOOL
843 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" if CMDLINE_BOOL
846 On some platforms, there is currently no way for the boot loader to
847 pass arguments to the kernel. For these platforms, you can supply
848 some command-line options at build time by entering them here. In
849 most cases you will need to specify the root device here.
852 bool "Always use the default kernel command string"
853 depends on CMDLINE_BOOL
855 Always use the default kernel command string, even if the boot
856 loader passes other arguments to the kernel.
857 This is useful if you cannot or don't want to change the
858 command-line options your boot loader passes to the kernel.
861 string "Additional default image types"
863 List additional targets to be built by the bootwrapper here (separated
864 by spaces). This is useful for targets that depend of device tree
865 files in the .dts directory.
867 Targets in this list will be build as part of the default build
868 target, or when the user does a 'make zImage' or a
869 'make zImage.initrd'.
871 If unsure, leave blank
873 config ARCH_WANTS_FREEZER_CONTROL
877 source "kernel/power/Kconfig"
880 bool "Enable seccomp to safely compute untrusted bytecode"
884 This kernel feature is useful for number crunching applications
885 that may need to compute untrusted bytecode during their
886 execution. By using pipes or other transports made available to
887 the process as file descriptors supporting the read/write
888 syscalls, it's possible to isolate those applications in
889 their own address space using seccomp. Once seccomp is
890 enabled via /proc/<pid>/seccomp, it cannot be disabled
891 and the task is only allowed to execute a few safe syscalls
892 defined by each seccomp mode.
894 If unsure, say Y. Only embedded should say N here.
897 prompt "PowerPC Memory Protection Keys"
899 depends on PPC_BOOK3S_64
900 select ARCH_USES_HIGH_VMA_FLAGS
901 select ARCH_HAS_PKEYS
903 Memory Protection Keys provides a mechanism for enforcing
904 page-based protections, but without requiring modification of the
905 page tables when an application changes protection domains.
907 For details, see Documentation/vm/protection-keys.rst
920 bool "Support for ISA-bus hardware"
924 Find out whether you have ISA slots on your motherboard. ISA is the
925 name of a bus system, i.e. the way the CPU talks to the other stuff
926 inside your box. If you have an Apple machine, say N here; if you
927 have an IBM RS/6000 or pSeries machine, say Y. If you have an
928 embedded board, consult your board documentation.
930 config GENERIC_ISA_DMA
932 depends on ISA_DMA_API
935 config PPC_INDIRECT_PCI
938 default y if 40x || 44x
948 select ARCH_HAS_DMA_SET_MASK
949 select PPC_INDIRECT_PCI
955 depends on SUSPEND && (PPC_85xx || PPC_86xx)
957 Freescale MPC85xx/MPC86xx power management controller support
958 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
963 depends on SUSPEND && (44x || 40x)
965 PPC4xx Clock Power Management (CPM) support (suspend/resume).
966 It also enables support for two different idle states (idle-wait
973 bool "Freescale Local Bus support"
975 Enables reporting of errors from the Freescale local bus
976 controller. Also contains some common code used by
977 drivers for specific local bus peripherals.
981 depends on PPC_83xx || QUICC_ENGINE || CPM2
983 Freescale General-purpose Timers support
987 depends on PCI && 8260
988 select PPC_INDIRECT_PCI
992 bool "Freescale Embedded SRIO Controller support"
993 depends on RAPIDIO = y && HAVE_RAPIDIO
996 Include support for RapidIO controller on Freescale embedded
997 processors (MPC8548, MPC8641, etc).
1001 config NONSTATIC_KERNEL
1004 menu "Advanced setup"
1007 config ADVANCED_OPTIONS
1008 bool "Prompt for advanced kernel configuration options"
1010 This option will enable prompting for a variety of advanced kernel
1011 configuration options. These options can cause the kernel to not
1012 work if they are set incorrectly, but can be used to optimize certain
1013 aspects of kernel memory management.
1015 Unless you know what you are doing, say N here.
1017 comment "Default settings for advanced configuration options are used"
1018 depends on !ADVANCED_OPTIONS
1020 config LOWMEM_SIZE_BOOL
1021 bool "Set maximum low memory"
1022 depends on ADVANCED_OPTIONS
1024 This option allows you to set the maximum amount of memory which
1025 will be used as "low memory", that is, memory which the kernel can
1026 access directly, without having to set up a kernel virtual mapping.
1027 This can be useful in optimizing the layout of kernel virtual
1030 Say N here unless you know what you are doing.
1033 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1034 default "0x30000000"
1036 config LOWMEM_CAM_NUM_BOOL
1037 bool "Set number of CAMs to use to map low memory"
1038 depends on ADVANCED_OPTIONS && FSL_BOOKE
1040 This option allows you to set the maximum number of CAM slots that
1041 will be used to map low memory. There are a limited number of slots
1042 available and even more limited number that will fit in the L1 MMU.
1043 However, using more entries will allow mapping more low memory. This
1044 can be useful in optimizing the layout of kernel virtual memory.
1046 Say N here unless you know what you are doing.
1048 config LOWMEM_CAM_NUM
1049 depends on FSL_BOOKE
1050 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1053 config DYNAMIC_MEMSTART
1054 bool "Enable page aligned dynamic load address for kernel"
1055 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1056 select NONSTATIC_KERNEL
1058 This option enables the kernel to be loaded at any page aligned
1059 physical address. The kernel creates a mapping from KERNELBASE to
1060 the address where the kernel is loaded. The page size here implies
1061 the TLB page size of the mapping for kernel on the particular platform.
1062 Please refer to the init code for finding the TLB page size.
1064 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1065 kernel image, where the only restriction is the page aligned kernel
1066 load address. When this option is enabled, the compile time physical
1067 address CONFIG_PHYSICAL_START is ignored.
1069 This option is overridden by CONFIG_RELOCATABLE
1071 config PAGE_OFFSET_BOOL
1072 bool "Set custom page offset address"
1073 depends on ADVANCED_OPTIONS
1075 This option allows you to set the kernel virtual address at which
1076 the kernel will map low memory. This can be useful in optimizing
1077 the virtual memory layout of the system.
1079 Say N here unless you know what you are doing.
1082 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1083 default "0xc0000000"
1085 config KERNEL_START_BOOL
1086 bool "Set custom kernel base address"
1087 depends on ADVANCED_OPTIONS
1089 This option allows you to set the kernel virtual address at which
1090 the kernel will be loaded. Normally this should match PAGE_OFFSET
1091 however there are times (like kdump) that one might not want them
1094 Say N here unless you know what you are doing.
1097 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1098 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1099 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1100 default "0xc0000000"
1102 config PHYSICAL_START_BOOL
1103 bool "Set physical address where the kernel is loaded"
1104 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1106 This gives the physical address where the kernel is loaded.
1108 Say N here unless you know what you are doing.
1110 config PHYSICAL_START
1111 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1112 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1113 default "0x00000000"
1115 config PHYSICAL_ALIGN
1117 default "0x04000000" if FSL_BOOKE
1119 This value puts the alignment restrictions on physical address
1120 where kernel is loaded and run from. Kernel is compiled for an
1121 address which meets above alignment restriction.
1123 config TASK_SIZE_BOOL
1124 bool "Set custom user task size"
1125 depends on ADVANCED_OPTIONS
1127 This option allows you to set the amount of virtual address space
1128 allocated to user tasks. This can be useful in optimizing the
1129 virtual memory layout of the system.
1131 Say N here unless you know what you are doing.
1134 hex "Size of user task space" if TASK_SIZE_BOOL
1135 default "0x80000000" if PPC_8xx
1136 default "0xc0000000"
1138 config CONSISTENT_SIZE_BOOL
1139 bool "Set custom consistent memory pool size"
1140 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1142 This option allows you to set the size of the
1143 consistent memory pool. This pool of virtual memory
1144 is used to make consistent memory allocations.
1146 config CONSISTENT_SIZE
1147 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1148 default "0x00200000" if NOT_COHERENT_CACHE
1151 bool "Pinned Kernel TLBs (860 ONLY)"
1152 depends on ADVANCED_OPTIONS && PPC_8xx && \
1153 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1156 bool "Pinned TLB for DATA"
1161 bool "Pinned TLB for IMMR"
1162 depends on PIN_TLB || PPC_EARLY_DEBUG_CPM
1166 bool "Pinned TLB for TEXT"
1172 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1175 default "0xc000000000000000"
1178 default "0xc000000000000000"
1179 config PHYSICAL_START
1181 default "0x00000000"
1187 config PPC_LIB_RHEAP
1190 source "arch/powerpc/kvm/Kconfig"
1192 source "kernel/livepatch/Kconfig"