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_ASM_MODVERSIONS
181 select HAVE_C_RECORDMCOUNT
182 select HAVE_CBPF_JIT if !PPC64
183 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
184 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
185 select HAVE_CONTEXT_TRACKING if PPC64
186 select HAVE_DEBUG_KMEMLEAK
187 select HAVE_DEBUG_STACKOVERFLOW
188 select HAVE_DYNAMIC_FTRACE
189 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
190 select HAVE_EBPF_JIT if PPC64
191 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
193 select HAVE_FTRACE_MCOUNT_RECORD
194 select HAVE_FUNCTION_ERROR_INJECTION
195 select HAVE_FUNCTION_GRAPH_TRACER
196 select HAVE_FUNCTION_TRACER
197 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
198 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
200 select HAVE_IOREMAP_PROT
201 select HAVE_IRQ_EXIT_ON_IRQ_STACK
202 select HAVE_KERNEL_GZIP
203 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
204 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
205 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
207 select HAVE_KPROBES_ON_FTRACE
208 select HAVE_KRETPROBES
209 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
210 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
211 select HAVE_MEMBLOCK_NODE_MAP
212 select HAVE_MOD_ARCH_SPECIFIC
213 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
214 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
216 select HAVE_OPTPROBES if PPC64
217 select HAVE_PERF_EVENTS
218 select HAVE_PERF_EVENTS_NMI if PPC64
219 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
220 select HAVE_PERF_REGS
221 select HAVE_PERF_USER_STACK_DUMP
222 select HAVE_RCU_TABLE_FREE if SMP
223 select HAVE_RCU_TABLE_NO_INVALIDATE if HAVE_RCU_TABLE_FREE
224 select HAVE_MMU_GATHER_PAGE_SIZE
225 select HAVE_REGS_AND_STACK_ACCESS_API
226 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
227 select HAVE_SYSCALL_TRACEPOINTS
228 select HAVE_VIRT_CPU_ACCOUNTING
229 select HAVE_IRQ_TIME_ACCOUNTING
231 select IOMMU_HELPER if PPC64
233 select IRQ_FORCED_THREADING
234 select MODULES_USE_ELF_RELA
235 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
236 select NEED_SG_DMA_LENGTH
238 select OF_EARLY_FLATTREE
239 select OLD_SIGACTION if PPC32
240 select OLD_SIGSUSPEND
241 select PCI_DOMAINS if PCI
242 select PCI_SYSCALL if PCI
243 select PPC_DAWR if PPC64
246 select SYSCTL_EXCEPTION_TRACE
247 select THREAD_INFO_IN_TASK
248 select VIRT_TO_BUS if !PPC64
250 # Please keep this list sorted alphabetically.
253 config PPC_BARRIER_NOSPEC
256 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
269 select COMPAT_BINFMT_ELF
270 select ARCH_WANT_OLD_COMPAT_IPC
271 select COMPAT_OLD_SIGACTION
273 config SYSVIPC_COMPAT
275 depends on COMPAT && SYSVIPC
278 config SCHED_OMIT_FRAME_POINTER
282 config ARCH_MAY_HAVE_PC_FDC
286 config PPC_UDBG_16550
289 config GENERIC_TBSYNC
291 default y if PPC32 && SMP
302 config SYS_SUPPORTS_APM_EMULATION
303 default y if PMAC_APM_EMU
309 Used to allow a board to specify it wants an ePAPR compliant wrapper.
311 config DEFAULT_UIMAGE
314 Used to allow a board to specify it wants a uImage built by default
316 config ARCH_HIBERNATION_POSSIBLE
320 config ARCH_SUSPEND_POSSIBLE
322 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
323 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
326 config ARCH_SUSPEND_NONZERO_CPU
328 depends on PPC_POWERNV || PPC_PSERIES
330 config PPC_DCR_NATIVE
338 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
341 config PPC_OF_PLATFORM_PCI
344 depends on PPC64 # not supported on 32 bits yet
346 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
347 depends on PPC32 || PPC_BOOK3S_64
350 config ARCH_SUPPORTS_UPROBES
353 config PPC_ADV_DEBUG_REGS
355 depends on 40x || BOOKE
358 config PPC_ADV_DEBUG_IACS
360 depends on PPC_ADV_DEBUG_REGS
364 config PPC_ADV_DEBUG_DACS
366 depends on PPC_ADV_DEBUG_REGS
369 config PPC_ADV_DEBUG_DVCS
371 depends on PPC_ADV_DEBUG_REGS
375 config PPC_ADV_DEBUG_DAC_RANGE
377 depends on PPC_ADV_DEBUG_REGS && 44x
385 default y if PPC_BOOK3E_64
387 config PGTABLE_LEVELS
392 source "arch/powerpc/sysdev/Kconfig"
393 source "arch/powerpc/platforms/Kconfig"
395 menu "Kernel options"
398 bool "High memory support"
401 source "kernel/Kconfig.hz"
403 config HUGETLB_PAGE_SIZE_VARIABLE
405 depends on HUGETLB_PAGE && PPC_BOOK3S_64
408 config MATH_EMULATION
409 bool "Math emulation"
410 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
412 Some PowerPC chips designed for embedded applications do not have
413 a floating-point unit and therefore do not implement the
414 floating-point instructions in the PowerPC instruction set. If you
415 say Y here, the kernel will include code to emulate a floating-point
416 unit, which will allow programs that use floating-point
419 This is also useful to emulate missing (optional) instructions
420 such as fsqrt on cores that do have an FPU but do not implement
421 them (such as Freescale BookE).
424 prompt "Math emulation options"
425 default MATH_EMULATION_FULL
426 depends on MATH_EMULATION
428 config MATH_EMULATION_FULL
429 bool "Emulate all the floating point instructions"
431 Select this option will enable the kernel to support to emulate
432 all the floating point instructions. If your SoC doesn't have
433 a FPU, you should select this.
435 config MATH_EMULATION_HW_UNIMPLEMENTED
436 bool "Just emulate the FPU unimplemented instructions"
438 Select this if you know there does have a hardware FPU on your
439 SoC, but some floating point instructions are not implemented by that.
443 config PPC_TRANSACTIONAL_MEM
444 bool "Transactional Memory support for POWERPC"
445 depends on PPC_BOOK3S_64
450 Support user-mode Transactional Memory on POWERPC.
452 config LD_HEAD_STUB_CATCH
453 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
456 Very large kernels can cause linker branch stubs to be generated by
457 code in head_64.S, which moves the head text sections out of their
458 specified location. This option can work around the problem.
462 config MPROFILE_KERNEL
463 depends on PPC64 && CPU_LITTLE_ENDIAN
464 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
467 bool "Support for enabling/disabling CPUs"
468 depends on SMP && (PPC_PSERIES || \
469 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
471 Say Y here to be able to disable and re-enable individual
472 CPUs at runtime on SMP machines.
474 Say N if you are unsure.
476 config ARCH_CPU_PROBE_RELEASE
478 depends on HOTPLUG_CPU
480 config ARCH_ENABLE_MEMORY_HOTPLUG
483 config ARCH_ENABLE_MEMORY_HOTREMOVE
486 config PPC64_SUPPORTS_MEMORY_FAILURE
487 bool "Add support for memory hwpoison"
488 depends on PPC_BOOK3S_64
489 default "y" if PPC_POWERNV
490 select ARCH_SUPPORTS_MEMORY_FAILURE
493 bool "kexec system call"
494 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
497 kexec is a system call that implements the ability to shutdown your
498 current kernel, and to start another kernel. It is like a reboot
499 but it is independent of the system firmware. And like a reboot
500 you can start any kernel with it, not just Linux.
502 The name comes from the similarity to the exec system call.
504 It is an ongoing process to be certain the hardware in a machine
505 is properly shutdown, so do not be surprised if this code does not
506 initially work for you. As of this writing the exact hardware
507 interface is strongly in flux, so no good recommendation can be
511 bool "kexec file based system call"
513 select HAVE_IMA_KEXEC
518 depends on CRYPTO_SHA256=y
520 This is a new version of the kexec system call. This call is
521 file based and takes in file descriptors as system call arguments
522 for kernel and initramfs as opposed to a list of segments as is the
523 case for the older kexec call.
525 config ARCH_HAS_KEXEC_PURGATORY
529 bool "Build a relocatable kernel"
530 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
531 select NONSTATIC_KERNEL
532 select MODULE_REL_CRCS if MODVERSIONS
534 This builds a kernel image that is capable of running at the
535 location the kernel is loaded at. For ppc32, there is no any
536 alignment restrictions, and this feature is a superset of
537 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
538 16k-aligned base address. The kernel is linked as a
539 position-independent executable (PIE) and contains dynamic relocations
540 which are processed early in the bootup process.
542 One use is for the kexec on panic case where the recovery kernel
543 must live at a different physical address than the primary
546 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
547 it has been loaded at and the compile time physical addresses
548 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
549 setting can still be useful to bootwrappers that need to know the
550 load address of the kernel (eg. u-boot/mkimage).
552 config RELOCATABLE_TEST
553 bool "Test relocatable kernel"
554 depends on (PPC64 && RELOCATABLE)
556 This runs the relocatable kernel at the address it was initially
557 loaded at, which tends to be non-zero and therefore test the
561 bool "Build a dump capture kernel"
562 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
563 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
565 Build a kernel suitable for use as a dump capture kernel.
566 The same kernel binary can be used as production kernel and dump
570 bool "Firmware-assisted dump"
571 depends on PPC64 && PPC_RTAS
575 A robust mechanism to get reliable kernel crash dump with
576 assistance from firmware. This approach does not use kexec,
577 instead firmware assists in booting the capture kernel
578 while preserving memory contents. Firmware-assisted dump
579 is meant to be a kdump replacement offering robustness and
580 speed not possible without system firmware assistance.
585 bool "Distribute interrupts on all CPUs by default"
588 This option gives the kernel permission to distribute IRQs across
589 multiple CPUs. Saying N here will route all IRQs to the first
590 CPU. Generally saying Y is safe, although some problems have been
591 reported with SMP Power Macintoshes with this option enabled.
596 default y if SMP && PPC_PSERIES
602 depends on NEED_MULTIPLE_NODES
604 config USE_PERCPU_NUMA_NODE_ID
608 config HAVE_MEMORYLESS_NODES
612 config ARCH_SELECT_MEMORY_MODEL
616 config ARCH_FLATMEM_ENABLE
618 depends on (PPC64 && !NUMA) || PPC32
620 config ARCH_SPARSEMEM_ENABLE
623 select SPARSEMEM_VMEMMAP_ENABLE
625 config ARCH_SPARSEMEM_DEFAULT
627 depends on PPC_BOOK3S_64
629 config SYS_SUPPORTS_HUGETLBFS
632 config ILLEGAL_POINTER_VALUE
634 # This is roughly half way between the top of user space and the bottom
635 # of kernel space, which seems about as good as we can get.
636 default 0x5deadbeef0000000 if PPC64
639 config ARCH_MEMORY_PROBE
641 depends on MEMORY_HOTPLUG
643 # Some NUMA nodes have memory ranges that span
644 # other nodes. Even though a pfn is valid and
645 # between a node's start and end pfns, it may not
646 # reside on that node. See memmap_init_zone()
648 config NODES_SPAN_OTHER_NODES
650 depends on NEED_MULTIPLE_NODES
653 bool "Using standard binutils settings"
657 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
658 Note, that kernel will be able to run only those applications,
659 which had been compiled using binutils later than 2.17.50.0.3 with
660 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
661 the older binutils, you can patch them with a trivial patch, which
662 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
668 Select the kernel logical page size. Increasing the page size
669 will reduce software overhead at each page boundary, allow
670 hardware prefetch mechanisms to be more effective, and allow
671 larger dma transfers increasing IO efficiency and reducing
672 overhead. However the utilization of memory will increase.
673 For example, each cached file will using a multiple of the
674 page size to hold its contents and the difference between the
675 end of file and the end of page is wasted.
677 Some dedicated systems, such as software raid serving with
678 accelerated calculations, have shown significant increases.
680 If you configure a 64 bit kernel for 64k pages but the
681 processor does not support them, then the kernel will simulate
682 them with 4k pages, loading them on demand, but with the
683 reduced software overhead and larger internal fragmentation.
684 For the 32 bit kernel, a large page option will not be offered
685 unless it is supported by the configured processor.
687 If unsure, choose 4K_PAGES.
691 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
695 depends on 44x || PPC_8xx
699 depends on 44x || PPC_BOOK3S_64
700 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
702 config PPC_256K_PAGES
703 bool "256k page size"
704 depends on 44x && !STDBINUTILS
706 Make the page size 256k.
708 As the ELF standard only requires alignment to support page
709 sizes up to 64k, you will need to compile all of your user
710 space applications with a non-standard binutils settings
711 (see the STDBINUTILS description for details).
713 Say N unless you know what you are doing.
717 config PPC_PAGE_SHIFT
719 default 18 if PPC_256K_PAGES
720 default 16 if PPC_64K_PAGES
721 default 14 if PPC_16K_PAGES
725 int "Thread shift" if EXPERT
727 default "15" if PPC_256K_PAGES
728 default "14" if PPC64
731 Used to define the stack size. The default is almost always what you
732 want. Only change this if you know what you are doing.
734 config ETEXT_SHIFT_BOOL
735 bool "Set custom etext alignment" if STRICT_KERNEL_RWX && \
736 (PPC_BOOK3S_32 || PPC_8xx)
737 depends on ADVANCED_OPTIONS
739 This option allows you to set the kernel end of text alignment. When
740 RAM is mapped by blocks, the alignment needs to fit the size and
741 number of possible blocks. The default should be OK for most configs.
743 Say N here unless you know what you are doing.
746 int "_etext shift" if ETEXT_SHIFT_BOOL
747 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
748 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
749 default 17 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
750 default 19 if STRICT_KERNEL_RWX && PPC_8xx
751 default PPC_PAGE_SHIFT
753 On Book3S 32 (603+), IBATs are used to map kernel text.
754 Smaller is the alignment, greater is the number of necessary IBATs.
756 On 8xx, large pages (512kb or 8M) are used to map kernel linear
757 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
760 config DATA_SHIFT_BOOL
761 bool "Set custom data alignment" if STRICT_KERNEL_RWX && \
762 (PPC_BOOK3S_32 || PPC_8xx)
763 depends on ADVANCED_OPTIONS
765 This option allows you to set the kernel data alignment. When
766 RAM is mapped by blocks, the alignment needs to fit the size and
767 number of possible blocks. The default should be OK for most configs.
769 Say N here unless you know what you are doing.
772 int "Data shift" if DATA_SHIFT_BOOL
773 default 24 if STRICT_KERNEL_RWX && PPC64
774 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
775 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
776 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
777 default 23 if STRICT_KERNEL_RWX && PPC_8xx
778 default PPC_PAGE_SHIFT
780 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
781 Smaller is the alignment, greater is the number of necessary DBATs.
783 On 8xx, large pages (512kb or 8M) are used to map kernel linear
784 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
787 config FORCE_MAX_ZONEORDER
788 int "Maximum zone order"
789 range 8 9 if PPC64 && PPC_64K_PAGES
790 default "9" if PPC64 && PPC_64K_PAGES
791 range 13 13 if PPC64 && !PPC_64K_PAGES
792 default "13" if PPC64 && !PPC_64K_PAGES
793 range 9 64 if PPC32 && PPC_16K_PAGES
794 default "9" if PPC32 && PPC_16K_PAGES
795 range 7 64 if PPC32 && PPC_64K_PAGES
796 default "7" if PPC32 && PPC_64K_PAGES
797 range 5 64 if PPC32 && PPC_256K_PAGES
798 default "5" if PPC32 && PPC_256K_PAGES
802 The kernel memory allocator divides physically contiguous memory
803 blocks into "zones", where each zone is a power of two number of
804 pages. This option selects the largest power of two that the kernel
805 keeps in the memory allocator. If you need to allocate very large
806 blocks of physically contiguous memory, then you may need to
809 This config option is actually maximum order plus one. For example,
810 a value of 11 means that the largest free memory block is 2^10 pages.
812 The page size is not necessarily 4KB. For example, on 64-bit
813 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
814 this in mind when choosing a value for this option.
816 config PPC_SUBPAGE_PROT
817 bool "Support setting protections for 4k subpages"
818 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
820 This option adds support for a system call to allow user programs
821 to set access permissions (read/write, readonly, or no access)
822 on the 4k subpages of each 64k page.
824 config PPC_COPRO_BASE
828 bool "SMT (Hyperthreading) scheduler support"
829 depends on PPC64 && SMP
831 SMT scheduler support improves the CPU scheduler's decision making
832 when dealing with POWER5 cpus at a cost of slightly increased
833 overhead in some places. If unsure say N here.
835 config PPC_DENORMALISATION
836 bool "PowerPC denormalisation exception handling"
837 depends on PPC_BOOK3S_64
838 default "y" if PPC_POWERNV
840 Add support for handling denormalisation of single precision
841 values. Useful for bare metal only. If unsure say Y here.
844 bool "Default bootloader kernel arguments"
847 string "Initial kernel command string" if CMDLINE_BOOL
848 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" if CMDLINE_BOOL
851 On some platforms, there is currently no way for the boot loader to
852 pass arguments to the kernel. For these platforms, you can supply
853 some command-line options at build time by entering them here. In
854 most cases you will need to specify the root device here.
857 bool "Always use the default kernel command string"
858 depends on CMDLINE_BOOL
860 Always use the default kernel command string, even if the boot
861 loader passes other arguments to the kernel.
862 This is useful if you cannot or don't want to change the
863 command-line options your boot loader passes to the kernel.
866 string "Additional default image types"
868 List additional targets to be built by the bootwrapper here (separated
869 by spaces). This is useful for targets that depend of device tree
870 files in the .dts directory.
872 Targets in this list will be build as part of the default build
873 target, or when the user does a 'make zImage' or a
874 'make zImage.initrd'.
876 If unsure, leave blank
878 config ARCH_WANTS_FREEZER_CONTROL
882 source "kernel/power/Kconfig"
885 bool "Enable seccomp to safely compute untrusted bytecode"
889 This kernel feature is useful for number crunching applications
890 that may need to compute untrusted bytecode during their
891 execution. By using pipes or other transports made available to
892 the process as file descriptors supporting the read/write
893 syscalls, it's possible to isolate those applications in
894 their own address space using seccomp. Once seccomp is
895 enabled via /proc/<pid>/seccomp, it cannot be disabled
896 and the task is only allowed to execute a few safe syscalls
897 defined by each seccomp mode.
899 If unsure, say Y. Only embedded should say N here.
902 prompt "PowerPC Memory Protection Keys"
904 depends on PPC_BOOK3S_64
905 select ARCH_USES_HIGH_VMA_FLAGS
906 select ARCH_HAS_PKEYS
908 Memory Protection Keys provides a mechanism for enforcing
909 page-based protections, but without requiring modification of the
910 page tables when an application changes protection domains.
912 For details, see Documentation/core-api/protection-keys.rst
925 bool "Support for ISA-bus hardware"
929 Find out whether you have ISA slots on your motherboard. ISA is the
930 name of a bus system, i.e. the way the CPU talks to the other stuff
931 inside your box. If you have an Apple machine, say N here; if you
932 have an IBM RS/6000 or pSeries machine, say Y. If you have an
933 embedded board, consult your board documentation.
935 config GENERIC_ISA_DMA
937 depends on ISA_DMA_API
940 config PPC_INDIRECT_PCI
943 default y if 40x || 44x
953 select ARCH_HAS_DMA_SET_MASK
954 select PPC_INDIRECT_PCI
960 depends on SUSPEND && (PPC_85xx || PPC_86xx)
962 Freescale MPC85xx/MPC86xx power management controller support
963 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
968 depends on SUSPEND && (44x || 40x)
970 PPC4xx Clock Power Management (CPM) support (suspend/resume).
971 It also enables support for two different idle states (idle-wait
978 bool "Freescale Local Bus support"
980 Enables reporting of errors from the Freescale local bus
981 controller. Also contains some common code used by
982 drivers for specific local bus peripherals.
986 depends on PPC_83xx || QUICC_ENGINE || CPM2
988 Freescale General-purpose Timers support
992 depends on PCI && 8260
993 select PPC_INDIRECT_PCI
997 bool "Freescale Embedded SRIO Controller support"
998 depends on RAPIDIO = y && HAVE_RAPIDIO
1001 Include support for RapidIO controller on Freescale embedded
1002 processors (MPC8548, MPC8641, etc).
1006 config NONSTATIC_KERNEL
1009 menu "Advanced setup"
1012 config ADVANCED_OPTIONS
1013 bool "Prompt for advanced kernel configuration options"
1015 This option will enable prompting for a variety of advanced kernel
1016 configuration options. These options can cause the kernel to not
1017 work if they are set incorrectly, but can be used to optimize certain
1018 aspects of kernel memory management.
1020 Unless you know what you are doing, say N here.
1022 comment "Default settings for advanced configuration options are used"
1023 depends on !ADVANCED_OPTIONS
1025 config LOWMEM_SIZE_BOOL
1026 bool "Set maximum low memory"
1027 depends on ADVANCED_OPTIONS
1029 This option allows you to set the maximum amount of memory which
1030 will be used as "low memory", that is, memory which the kernel can
1031 access directly, without having to set up a kernel virtual mapping.
1032 This can be useful in optimizing the layout of kernel virtual
1035 Say N here unless you know what you are doing.
1038 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1039 default "0x30000000"
1041 config LOWMEM_CAM_NUM_BOOL
1042 bool "Set number of CAMs to use to map low memory"
1043 depends on ADVANCED_OPTIONS && FSL_BOOKE
1045 This option allows you to set the maximum number of CAM slots that
1046 will be used to map low memory. There are a limited number of slots
1047 available and even more limited number that will fit in the L1 MMU.
1048 However, using more entries will allow mapping more low memory. This
1049 can be useful in optimizing the layout of kernel virtual memory.
1051 Say N here unless you know what you are doing.
1053 config LOWMEM_CAM_NUM
1054 depends on FSL_BOOKE
1055 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1058 config DYNAMIC_MEMSTART
1059 bool "Enable page aligned dynamic load address for kernel"
1060 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1061 select NONSTATIC_KERNEL
1063 This option enables the kernel to be loaded at any page aligned
1064 physical address. The kernel creates a mapping from KERNELBASE to
1065 the address where the kernel is loaded. The page size here implies
1066 the TLB page size of the mapping for kernel on the particular platform.
1067 Please refer to the init code for finding the TLB page size.
1069 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1070 kernel image, where the only restriction is the page aligned kernel
1071 load address. When this option is enabled, the compile time physical
1072 address CONFIG_PHYSICAL_START is ignored.
1074 This option is overridden by CONFIG_RELOCATABLE
1076 config PAGE_OFFSET_BOOL
1077 bool "Set custom page offset address"
1078 depends on ADVANCED_OPTIONS
1080 This option allows you to set the kernel virtual address at which
1081 the kernel will map low memory. This can be useful in optimizing
1082 the virtual memory layout of the system.
1084 Say N here unless you know what you are doing.
1087 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1088 default "0xc0000000"
1090 config KERNEL_START_BOOL
1091 bool "Set custom kernel base address"
1092 depends on ADVANCED_OPTIONS
1094 This option allows you to set the kernel virtual address at which
1095 the kernel will be loaded. Normally this should match PAGE_OFFSET
1096 however there are times (like kdump) that one might not want them
1099 Say N here unless you know what you are doing.
1102 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1103 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1104 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1105 default "0xc0000000"
1107 config PHYSICAL_START_BOOL
1108 bool "Set physical address where the kernel is loaded"
1109 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1111 This gives the physical address where the kernel is loaded.
1113 Say N here unless you know what you are doing.
1115 config PHYSICAL_START
1116 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1117 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1118 default "0x00000000"
1120 config PHYSICAL_ALIGN
1122 default "0x04000000" if FSL_BOOKE
1124 This value puts the alignment restrictions on physical address
1125 where kernel is loaded and run from. Kernel is compiled for an
1126 address which meets above alignment restriction.
1128 config TASK_SIZE_BOOL
1129 bool "Set custom user task size"
1130 depends on ADVANCED_OPTIONS
1132 This option allows you to set the amount of virtual address space
1133 allocated to user tasks. This can be useful in optimizing the
1134 virtual memory layout of the system.
1136 Say N here unless you know what you are doing.
1139 hex "Size of user task space" if TASK_SIZE_BOOL
1140 default "0x80000000" if PPC_8xx
1141 default "0xc0000000"
1143 config CONSISTENT_SIZE_BOOL
1144 bool "Set custom consistent memory pool size"
1145 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1147 This option allows you to set the size of the
1148 consistent memory pool. This pool of virtual memory
1149 is used to make consistent memory allocations.
1151 config CONSISTENT_SIZE
1152 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1153 default "0x00200000" if NOT_COHERENT_CACHE
1156 bool "Pinned Kernel TLBs (860 ONLY)"
1157 depends on ADVANCED_OPTIONS && PPC_8xx && \
1158 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1161 bool "Pinned TLB for DATA"
1166 bool "Pinned TLB for IMMR"
1167 depends on PIN_TLB || PPC_EARLY_DEBUG_CPM
1171 bool "Pinned TLB for TEXT"
1177 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1180 default "0xc000000000000000"
1183 default "0xc000000000000000"
1184 config PHYSICAL_START
1186 default "0x00000000"
1192 config PPC_LIB_RHEAP
1195 source "arch/powerpc/kvm/Kconfig"
1197 source "kernel/livepatch/Kconfig"