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_HUGEPD if HUGETLB_PAGE
129 select ARCH_HAS_MMIOWB if PPC64
130 select ARCH_HAS_PHYS_TO_DMA
131 select ARCH_HAS_PMEM_API if PPC64
132 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
133 select ARCH_HAS_PTE_SPECIAL
134 select ARCH_HAS_MEMBARRIER_CALLBACKS
135 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC64
136 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION)
137 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
138 select ARCH_HAS_UACCESS_FLUSHCACHE if PPC64
139 select ARCH_HAS_UBSAN_SANITIZE_ALL
140 select ARCH_HAVE_NMI_SAFE_CMPXCHG
141 select ARCH_KEEP_MEMBLOCK
142 select ARCH_MIGHT_HAVE_PC_PARPORT
143 select ARCH_MIGHT_HAVE_PC_SERIO
144 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
145 select ARCH_SUPPORTS_ATOMIC_RMW
146 select ARCH_USE_BUILTIN_BSWAP
147 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
148 select ARCH_WANT_IPC_PARSE_VERSION
149 select ARCH_WEAK_RELEASE_ACQUIRE
151 select BUILDTIME_EXTABLE_SORT
152 select CLONE_BACKWARDS
153 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
154 select DYNAMIC_FTRACE if FUNCTION_TRACER
155 select EDAC_ATOMIC_SCRUB
157 select GENERIC_ATOMIC64 if PPC32
158 select GENERIC_CLOCKEVENTS
159 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
160 select GENERIC_CMOS_UPDATE
161 select GENERIC_CPU_AUTOPROBE
162 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
163 select GENERIC_IRQ_SHOW
164 select GENERIC_IRQ_SHOW_LEVEL
165 select GENERIC_PCI_IOMAP if PCI
166 select GENERIC_SMP_IDLE_THREAD
167 select GENERIC_STRNCPY_FROM_USER
168 select GENERIC_STRNLEN_USER
169 select GENERIC_TIME_VSYSCALL
170 select HAVE_ARCH_AUDITSYSCALL
171 select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
172 select HAVE_ARCH_JUMP_LABEL
173 select HAVE_ARCH_KASAN if PPC32
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_NVRAM_OPS
178 select HAVE_ARCH_SECCOMP_FILTER
179 select HAVE_ARCH_TRACEHOOK
180 select HAVE_C_RECORDMCOUNT
181 select HAVE_CBPF_JIT if !PPC64
182 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
183 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
184 select HAVE_CONTEXT_TRACKING if PPC64
185 select HAVE_DEBUG_KMEMLEAK
186 select HAVE_DEBUG_STACKOVERFLOW
187 select HAVE_DYNAMIC_FTRACE
188 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
189 select HAVE_EBPF_JIT if PPC64
190 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
192 select HAVE_FTRACE_MCOUNT_RECORD
193 select HAVE_FUNCTION_ERROR_INJECTION
194 select HAVE_FUNCTION_GRAPH_TRACER
195 select HAVE_FUNCTION_TRACER
196 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
197 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
199 select HAVE_IOREMAP_PROT
200 select HAVE_IRQ_EXIT_ON_IRQ_STACK
201 select HAVE_KERNEL_GZIP
202 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
203 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
204 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
206 select HAVE_KPROBES_ON_FTRACE
207 select HAVE_KRETPROBES
208 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
209 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
210 select HAVE_MEMBLOCK_NODE_MAP
211 select HAVE_MOD_ARCH_SPECIFIC
212 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
213 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
215 select HAVE_OPTPROBES if PPC64
216 select HAVE_PERF_EVENTS
217 select HAVE_PERF_EVENTS_NMI if PPC64
218 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
219 select HAVE_PERF_REGS
220 select HAVE_PERF_USER_STACK_DUMP
221 select HAVE_RCU_TABLE_FREE if SMP
222 select HAVE_RCU_TABLE_NO_INVALIDATE if HAVE_RCU_TABLE_FREE
223 select HAVE_MMU_GATHER_PAGE_SIZE
224 select HAVE_REGS_AND_STACK_ACCESS_API
225 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
226 select HAVE_SYSCALL_TRACEPOINTS
227 select HAVE_VIRT_CPU_ACCOUNTING
228 select HAVE_IRQ_TIME_ACCOUNTING
230 select IOMMU_HELPER if PPC64
232 select IRQ_FORCED_THREADING
233 select MODULES_USE_ELF_RELA
234 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
235 select NEED_SG_DMA_LENGTH
237 select OF_EARLY_FLATTREE
238 select OLD_SIGACTION if PPC32
239 select OLD_SIGSUSPEND
240 select PCI_DOMAINS if PCI
241 select PCI_SYSCALL if PCI
242 select PPC_DAWR if PPC64
245 select SYSCTL_EXCEPTION_TRACE
246 select THREAD_INFO_IN_TASK
247 select VIRT_TO_BUS if !PPC64
249 # Please keep this list sorted alphabetically.
252 config PPC_BARRIER_NOSPEC
255 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
268 select COMPAT_BINFMT_ELF
269 select ARCH_WANT_OLD_COMPAT_IPC
270 select COMPAT_OLD_SIGACTION
272 config SYSVIPC_COMPAT
274 depends on COMPAT && SYSVIPC
277 config SCHED_OMIT_FRAME_POINTER
281 config ARCH_MAY_HAVE_PC_FDC
285 config PPC_UDBG_16550
288 config GENERIC_TBSYNC
290 default y if PPC32 && SMP
301 config SYS_SUPPORTS_APM_EMULATION
302 default y if PMAC_APM_EMU
308 Used to allow a board to specify it wants an ePAPR compliant wrapper.
310 config DEFAULT_UIMAGE
313 Used to allow a board to specify it wants a uImage built by default
315 config ARCH_HIBERNATION_POSSIBLE
319 config ARCH_SUSPEND_POSSIBLE
321 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
322 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
325 config ARCH_SUSPEND_NONZERO_CPU
327 depends on PPC_POWERNV || PPC_PSERIES
329 config PPC_DCR_NATIVE
337 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
340 config PPC_OF_PLATFORM_PCI
343 depends on PPC64 # not supported on 32 bits yet
345 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
346 depends on PPC32 || PPC_BOOK3S_64
349 config ARCH_SUPPORTS_UPROBES
352 config PPC_ADV_DEBUG_REGS
354 depends on 40x || BOOKE
357 config PPC_ADV_DEBUG_IACS
359 depends on PPC_ADV_DEBUG_REGS
363 config PPC_ADV_DEBUG_DACS
365 depends on PPC_ADV_DEBUG_REGS
368 config PPC_ADV_DEBUG_DVCS
370 depends on PPC_ADV_DEBUG_REGS
374 config PPC_ADV_DEBUG_DAC_RANGE
376 depends on PPC_ADV_DEBUG_REGS && 44x
384 default y if PPC_BOOK3E_64
386 config PGTABLE_LEVELS
391 source "arch/powerpc/sysdev/Kconfig"
392 source "arch/powerpc/platforms/Kconfig"
394 menu "Kernel options"
397 bool "High memory support"
400 source "kernel/Kconfig.hz"
402 config HUGETLB_PAGE_SIZE_VARIABLE
404 depends on HUGETLB_PAGE && PPC_BOOK3S_64
407 config MATH_EMULATION
408 bool "Math emulation"
409 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
411 Some PowerPC chips designed for embedded applications do not have
412 a floating-point unit and therefore do not implement the
413 floating-point instructions in the PowerPC instruction set. If you
414 say Y here, the kernel will include code to emulate a floating-point
415 unit, which will allow programs that use floating-point
418 This is also useful to emulate missing (optional) instructions
419 such as fsqrt on cores that do have an FPU but do not implement
420 them (such as Freescale BookE).
423 prompt "Math emulation options"
424 default MATH_EMULATION_FULL
425 depends on MATH_EMULATION
427 config MATH_EMULATION_FULL
428 bool "Emulate all the floating point instructions"
430 Select this option will enable the kernel to support to emulate
431 all the floating point instructions. If your SoC doesn't have
432 a FPU, you should select this.
434 config MATH_EMULATION_HW_UNIMPLEMENTED
435 bool "Just emulate the FPU unimplemented instructions"
437 Select this if you know there does have a hardware FPU on your
438 SoC, but some floating point instructions are not implemented by that.
442 config PPC_TRANSACTIONAL_MEM
443 bool "Transactional Memory support for POWERPC"
444 depends on PPC_BOOK3S_64
449 Support user-mode Transactional Memory on POWERPC.
451 config LD_HEAD_STUB_CATCH
452 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
455 Very large kernels can cause linker branch stubs to be generated by
456 code in head_64.S, which moves the head text sections out of their
457 specified location. This option can work around the problem.
461 config MPROFILE_KERNEL
462 depends on PPC64 && CPU_LITTLE_ENDIAN
463 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
466 bool "Support for enabling/disabling CPUs"
467 depends on SMP && (PPC_PSERIES || \
468 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
470 Say Y here to be able to disable and re-enable individual
471 CPUs at runtime on SMP machines.
473 Say N if you are unsure.
475 config ARCH_CPU_PROBE_RELEASE
477 depends on HOTPLUG_CPU
479 config ARCH_ENABLE_MEMORY_HOTPLUG
482 config ARCH_ENABLE_MEMORY_HOTREMOVE
485 config PPC64_SUPPORTS_MEMORY_FAILURE
486 bool "Add support for memory hwpoison"
487 depends on PPC_BOOK3S_64
488 default "y" if PPC_POWERNV
489 select ARCH_SUPPORTS_MEMORY_FAILURE
492 bool "kexec system call"
493 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
496 kexec is a system call that implements the ability to shutdown your
497 current kernel, and to start another kernel. It is like a reboot
498 but it is independent of the system firmware. And like a reboot
499 you can start any kernel with it, not just Linux.
501 The name comes from the similarity to the exec system call.
503 It is an ongoing process to be certain the hardware in a machine
504 is properly shutdown, so do not be surprised if this code does not
505 initially work for you. As of this writing the exact hardware
506 interface is strongly in flux, so no good recommendation can be
510 bool "kexec file based system call"
512 select HAVE_IMA_KEXEC
516 depends on CRYPTO_SHA256=y
518 This is a new version of the kexec system call. This call is
519 file based and takes in file descriptors as system call arguments
520 for kernel and initramfs as opposed to a list of segments as is the
521 case for the older kexec call.
523 config ARCH_HAS_KEXEC_PURGATORY
527 bool "Build a relocatable kernel"
528 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
529 select NONSTATIC_KERNEL
530 select MODULE_REL_CRCS if MODVERSIONS
532 This builds a kernel image that is capable of running at the
533 location the kernel is loaded at. For ppc32, there is no any
534 alignment restrictions, and this feature is a superset of
535 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
536 16k-aligned base address. The kernel is linked as a
537 position-independent executable (PIE) and contains dynamic relocations
538 which are processed early in the bootup process.
540 One use is for the kexec on panic case where the recovery kernel
541 must live at a different physical address than the primary
544 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
545 it has been loaded at and the compile time physical addresses
546 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
547 setting can still be useful to bootwrappers that need to know the
548 load address of the kernel (eg. u-boot/mkimage).
550 config RELOCATABLE_TEST
551 bool "Test relocatable kernel"
552 depends on (PPC64 && RELOCATABLE)
554 This runs the relocatable kernel at the address it was initially
555 loaded at, which tends to be non-zero and therefore test the
559 bool "Build a dump capture kernel"
560 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
561 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
563 Build a kernel suitable for use as a dump capture kernel.
564 The same kernel binary can be used as production kernel and dump
568 bool "Firmware-assisted dump"
569 depends on PPC64 && PPC_RTAS
573 A robust mechanism to get reliable kernel crash dump with
574 assistance from firmware. This approach does not use kexec,
575 instead firmware assists in booting the capture kernel
576 while preserving memory contents. Firmware-assisted dump
577 is meant to be a kdump replacement offering robustness and
578 speed not possible without system firmware assistance.
583 bool "Distribute interrupts on all CPUs by default"
586 This option gives the kernel permission to distribute IRQs across
587 multiple CPUs. Saying N here will route all IRQs to the first
588 CPU. Generally saying Y is safe, although some problems have been
589 reported with SMP Power Macintoshes with this option enabled.
594 default y if SMP && PPC_PSERIES
600 depends on NEED_MULTIPLE_NODES
602 config USE_PERCPU_NUMA_NODE_ID
606 config HAVE_MEMORYLESS_NODES
610 config ARCH_SELECT_MEMORY_MODEL
614 config ARCH_FLATMEM_ENABLE
616 depends on (PPC64 && !NUMA) || PPC32
618 config ARCH_SPARSEMEM_ENABLE
621 select SPARSEMEM_VMEMMAP_ENABLE
623 config ARCH_SPARSEMEM_DEFAULT
625 depends on PPC_BOOK3S_64
627 config SYS_SUPPORTS_HUGETLBFS
630 config ILLEGAL_POINTER_VALUE
632 # This is roughly half way between the top of user space and the bottom
633 # of kernel space, which seems about as good as we can get.
634 default 0x5deadbeef0000000 if PPC64
637 config ARCH_MEMORY_PROBE
639 depends on MEMORY_HOTPLUG
641 # Some NUMA nodes have memory ranges that span
642 # other nodes. Even though a pfn is valid and
643 # between a node's start and end pfns, it may not
644 # reside on that node. See memmap_init_zone()
646 config NODES_SPAN_OTHER_NODES
648 depends on NEED_MULTIPLE_NODES
651 bool "Using standard binutils settings"
655 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
656 Note, that kernel will be able to run only those applications,
657 which had been compiled using binutils later than 2.17.50.0.3 with
658 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
659 the older binutils, you can patch them with a trivial patch, which
660 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
666 Select the kernel logical page size. Increasing the page size
667 will reduce software overhead at each page boundary, allow
668 hardware prefetch mechanisms to be more effective, and allow
669 larger dma transfers increasing IO efficiency and reducing
670 overhead. However the utilization of memory will increase.
671 For example, each cached file will using a multiple of the
672 page size to hold its contents and the difference between the
673 end of file and the end of page is wasted.
675 Some dedicated systems, such as software raid serving with
676 accelerated calculations, have shown significant increases.
678 If you configure a 64 bit kernel for 64k pages but the
679 processor does not support them, then the kernel will simulate
680 them with 4k pages, loading them on demand, but with the
681 reduced software overhead and larger internal fragmentation.
682 For the 32 bit kernel, a large page option will not be offered
683 unless it is supported by the configured processor.
685 If unsure, choose 4K_PAGES.
689 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
693 depends on 44x || PPC_8xx
697 depends on 44x || PPC_BOOK3S_64
698 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
700 config PPC_256K_PAGES
701 bool "256k page size"
702 depends on 44x && !STDBINUTILS
704 Make the page size 256k.
706 As the ELF standard only requires alignment to support page
707 sizes up to 64k, you will need to compile all of your user
708 space applications with a non-standard binutils settings
709 (see the STDBINUTILS description for details).
711 Say N unless you know what you are doing.
715 config PPC_PAGE_SHIFT
717 default 18 if PPC_256K_PAGES
718 default 16 if PPC_64K_PAGES
719 default 14 if PPC_16K_PAGES
723 int "Thread shift" if EXPERT
725 default "15" if PPC_256K_PAGES
726 default "14" if PPC64
729 Used to define the stack size. The default is almost always what you
730 want. Only change this if you know what you are doing.
732 config ETEXT_SHIFT_BOOL
733 bool "Set custom etext alignment" if STRICT_KERNEL_RWX && \
734 (PPC_BOOK3S_32 || PPC_8xx)
735 depends on ADVANCED_OPTIONS
737 This option allows you to set the kernel end of text alignment. When
738 RAM is mapped by blocks, the alignment needs to fit the size and
739 number of possible blocks. The default should be OK for most configs.
741 Say N here unless you know what you are doing.
744 int "_etext shift" if ETEXT_SHIFT_BOOL
745 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
746 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
747 default 17 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
748 default 19 if STRICT_KERNEL_RWX && PPC_8xx
749 default PPC_PAGE_SHIFT
751 On Book3S 32 (603+), IBATs are used to map kernel text.
752 Smaller is the alignment, greater is the number of necessary IBATs.
754 On 8xx, large pages (512kb or 8M) are used to map kernel linear
755 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
758 config DATA_SHIFT_BOOL
759 bool "Set custom data alignment" if STRICT_KERNEL_RWX && \
760 (PPC_BOOK3S_32 || PPC_8xx)
761 depends on ADVANCED_OPTIONS
763 This option allows you to set the kernel data alignment. When
764 RAM is mapped by blocks, the alignment needs to fit the size and
765 number of possible blocks. The default should be OK for most configs.
767 Say N here unless you know what you are doing.
770 int "Data shift" if DATA_SHIFT_BOOL
771 default 24 if STRICT_KERNEL_RWX && PPC64
772 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
773 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
774 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
775 default 23 if STRICT_KERNEL_RWX && PPC_8xx
776 default PPC_PAGE_SHIFT
778 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
779 Smaller is the alignment, greater is the number of necessary DBATs.
781 On 8xx, large pages (512kb or 8M) are used to map kernel linear
782 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
785 config FORCE_MAX_ZONEORDER
786 int "Maximum zone order"
787 range 8 9 if PPC64 && PPC_64K_PAGES
788 default "9" if PPC64 && PPC_64K_PAGES
789 range 13 13 if PPC64 && !PPC_64K_PAGES
790 default "13" if PPC64 && !PPC_64K_PAGES
791 range 9 64 if PPC32 && PPC_16K_PAGES
792 default "9" if PPC32 && PPC_16K_PAGES
793 range 7 64 if PPC32 && PPC_64K_PAGES
794 default "7" if PPC32 && PPC_64K_PAGES
795 range 5 64 if PPC32 && PPC_256K_PAGES
796 default "5" if PPC32 && PPC_256K_PAGES
800 The kernel memory allocator divides physically contiguous memory
801 blocks into "zones", where each zone is a power of two number of
802 pages. This option selects the largest power of two that the kernel
803 keeps in the memory allocator. If you need to allocate very large
804 blocks of physically contiguous memory, then you may need to
807 This config option is actually maximum order plus one. For example,
808 a value of 11 means that the largest free memory block is 2^10 pages.
810 The page size is not necessarily 4KB. For example, on 64-bit
811 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
812 this in mind when choosing a value for this option.
814 config PPC_SUBPAGE_PROT
815 bool "Support setting protections for 4k subpages"
816 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
818 This option adds support for a system call to allow user programs
819 to set access permissions (read/write, readonly, or no access)
820 on the 4k subpages of each 64k page.
822 config PPC_COPRO_BASE
826 bool "SMT (Hyperthreading) scheduler support"
827 depends on PPC64 && SMP
829 SMT scheduler support improves the CPU scheduler's decision making
830 when dealing with POWER5 cpus at a cost of slightly increased
831 overhead in some places. If unsure say N here.
833 config PPC_DENORMALISATION
834 bool "PowerPC denormalisation exception handling"
835 depends on PPC_BOOK3S_64
836 default "y" if PPC_POWERNV
838 Add support for handling denormalisation of single precision
839 values. Useful for bare metal only. If unsure say Y here.
842 bool "Default bootloader kernel arguments"
845 string "Initial kernel command string" if CMDLINE_BOOL
846 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" if CMDLINE_BOOL
849 On some platforms, there is currently no way for the boot loader to
850 pass arguments to the kernel. For these platforms, you can supply
851 some command-line options at build time by entering them here. In
852 most cases you will need to specify the root device here.
855 bool "Always use the default kernel command string"
856 depends on CMDLINE_BOOL
858 Always use the default kernel command string, even if the boot
859 loader passes other arguments to the kernel.
860 This is useful if you cannot or don't want to change the
861 command-line options your boot loader passes to the kernel.
864 string "Additional default image types"
866 List additional targets to be built by the bootwrapper here (separated
867 by spaces). This is useful for targets that depend of device tree
868 files in the .dts directory.
870 Targets in this list will be build as part of the default build
871 target, or when the user does a 'make zImage' or a
872 'make zImage.initrd'.
874 If unsure, leave blank
876 config ARCH_WANTS_FREEZER_CONTROL
880 source "kernel/power/Kconfig"
883 bool "Enable seccomp to safely compute untrusted bytecode"
887 This kernel feature is useful for number crunching applications
888 that may need to compute untrusted bytecode during their
889 execution. By using pipes or other transports made available to
890 the process as file descriptors supporting the read/write
891 syscalls, it's possible to isolate those applications in
892 their own address space using seccomp. Once seccomp is
893 enabled via /proc/<pid>/seccomp, it cannot be disabled
894 and the task is only allowed to execute a few safe syscalls
895 defined by each seccomp mode.
897 If unsure, say Y. Only embedded should say N here.
900 prompt "PowerPC Memory Protection Keys"
902 depends on PPC_BOOK3S_64
903 select ARCH_USES_HIGH_VMA_FLAGS
904 select ARCH_HAS_PKEYS
906 Memory Protection Keys provides a mechanism for enforcing
907 page-based protections, but without requiring modification of the
908 page tables when an application changes protection domains.
910 For details, see Documentation/core-api/protection-keys.rst
923 bool "Support for ISA-bus hardware"
927 Find out whether you have ISA slots on your motherboard. ISA is the
928 name of a bus system, i.e. the way the CPU talks to the other stuff
929 inside your box. If you have an Apple machine, say N here; if you
930 have an IBM RS/6000 or pSeries machine, say Y. If you have an
931 embedded board, consult your board documentation.
933 config GENERIC_ISA_DMA
935 depends on ISA_DMA_API
938 config PPC_INDIRECT_PCI
941 default y if 40x || 44x
951 select ARCH_HAS_DMA_SET_MASK
952 select PPC_INDIRECT_PCI
958 depends on SUSPEND && (PPC_85xx || PPC_86xx)
960 Freescale MPC85xx/MPC86xx power management controller support
961 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
966 depends on SUSPEND && (44x || 40x)
968 PPC4xx Clock Power Management (CPM) support (suspend/resume).
969 It also enables support for two different idle states (idle-wait
976 bool "Freescale Local Bus support"
978 Enables reporting of errors from the Freescale local bus
979 controller. Also contains some common code used by
980 drivers for specific local bus peripherals.
984 depends on PPC_83xx || QUICC_ENGINE || CPM2
986 Freescale General-purpose Timers support
990 depends on PCI && 8260
991 select PPC_INDIRECT_PCI
995 bool "Freescale Embedded SRIO Controller support"
996 depends on RAPIDIO = y && HAVE_RAPIDIO
999 Include support for RapidIO controller on Freescale embedded
1000 processors (MPC8548, MPC8641, etc).
1004 config NONSTATIC_KERNEL
1007 menu "Advanced setup"
1010 config ADVANCED_OPTIONS
1011 bool "Prompt for advanced kernel configuration options"
1013 This option will enable prompting for a variety of advanced kernel
1014 configuration options. These options can cause the kernel to not
1015 work if they are set incorrectly, but can be used to optimize certain
1016 aspects of kernel memory management.
1018 Unless you know what you are doing, say N here.
1020 comment "Default settings for advanced configuration options are used"
1021 depends on !ADVANCED_OPTIONS
1023 config LOWMEM_SIZE_BOOL
1024 bool "Set maximum low memory"
1025 depends on ADVANCED_OPTIONS
1027 This option allows you to set the maximum amount of memory which
1028 will be used as "low memory", that is, memory which the kernel can
1029 access directly, without having to set up a kernel virtual mapping.
1030 This can be useful in optimizing the layout of kernel virtual
1033 Say N here unless you know what you are doing.
1036 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1037 default "0x30000000"
1039 config LOWMEM_CAM_NUM_BOOL
1040 bool "Set number of CAMs to use to map low memory"
1041 depends on ADVANCED_OPTIONS && FSL_BOOKE
1043 This option allows you to set the maximum number of CAM slots that
1044 will be used to map low memory. There are a limited number of slots
1045 available and even more limited number that will fit in the L1 MMU.
1046 However, using more entries will allow mapping more low memory. This
1047 can be useful in optimizing the layout of kernel virtual memory.
1049 Say N here unless you know what you are doing.
1051 config LOWMEM_CAM_NUM
1052 depends on FSL_BOOKE
1053 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1056 config DYNAMIC_MEMSTART
1057 bool "Enable page aligned dynamic load address for kernel"
1058 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1059 select NONSTATIC_KERNEL
1061 This option enables the kernel to be loaded at any page aligned
1062 physical address. The kernel creates a mapping from KERNELBASE to
1063 the address where the kernel is loaded. The page size here implies
1064 the TLB page size of the mapping for kernel on the particular platform.
1065 Please refer to the init code for finding the TLB page size.
1067 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1068 kernel image, where the only restriction is the page aligned kernel
1069 load address. When this option is enabled, the compile time physical
1070 address CONFIG_PHYSICAL_START is ignored.
1072 This option is overridden by CONFIG_RELOCATABLE
1074 config PAGE_OFFSET_BOOL
1075 bool "Set custom page offset address"
1076 depends on ADVANCED_OPTIONS
1078 This option allows you to set the kernel virtual address at which
1079 the kernel will map low memory. This can be useful in optimizing
1080 the virtual memory layout of the system.
1082 Say N here unless you know what you are doing.
1085 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1086 default "0xc0000000"
1088 config KERNEL_START_BOOL
1089 bool "Set custom kernel base address"
1090 depends on ADVANCED_OPTIONS
1092 This option allows you to set the kernel virtual address at which
1093 the kernel will be loaded. Normally this should match PAGE_OFFSET
1094 however there are times (like kdump) that one might not want them
1097 Say N here unless you know what you are doing.
1100 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1101 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1102 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1103 default "0xc0000000"
1105 config PHYSICAL_START_BOOL
1106 bool "Set physical address where the kernel is loaded"
1107 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1109 This gives the physical address where the kernel is loaded.
1111 Say N here unless you know what you are doing.
1113 config PHYSICAL_START
1114 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1115 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1116 default "0x00000000"
1118 config PHYSICAL_ALIGN
1120 default "0x04000000" if FSL_BOOKE
1122 This value puts the alignment restrictions on physical address
1123 where kernel is loaded and run from. Kernel is compiled for an
1124 address which meets above alignment restriction.
1126 config TASK_SIZE_BOOL
1127 bool "Set custom user task size"
1128 depends on ADVANCED_OPTIONS
1130 This option allows you to set the amount of virtual address space
1131 allocated to user tasks. This can be useful in optimizing the
1132 virtual memory layout of the system.
1134 Say N here unless you know what you are doing.
1137 hex "Size of user task space" if TASK_SIZE_BOOL
1138 default "0x80000000" if PPC_8xx
1139 default "0xc0000000"
1141 config CONSISTENT_SIZE_BOOL
1142 bool "Set custom consistent memory pool size"
1143 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1145 This option allows you to set the size of the
1146 consistent memory pool. This pool of virtual memory
1147 is used to make consistent memory allocations.
1149 config CONSISTENT_SIZE
1150 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1151 default "0x00200000" if NOT_COHERENT_CACHE
1154 bool "Pinned Kernel TLBs (860 ONLY)"
1155 depends on ADVANCED_OPTIONS && PPC_8xx && \
1156 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1159 bool "Pinned TLB for DATA"
1164 bool "Pinned TLB for IMMR"
1165 depends on PIN_TLB || PPC_EARLY_DEBUG_CPM
1169 bool "Pinned TLB for TEXT"
1175 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1178 default "0xc000000000000000"
1181 default "0xc000000000000000"
1182 config PHYSICAL_START
1184 default "0x00000000"
1190 config PPC_LIB_RHEAP
1193 source "arch/powerpc/kvm/Kconfig"
1195 source "kernel/livepatch/Kconfig"