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_SPECIAL
133 select ARCH_HAS_MEMBARRIER_CALLBACKS
134 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC64
135 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION)
136 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
137 select ARCH_HAS_UACCESS_FLUSHCACHE if PPC64
138 select ARCH_HAS_UBSAN_SANITIZE_ALL
139 select ARCH_HAS_ZONE_DEVICE if PPC_BOOK3S_64
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_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_CBPF_JIT if !PPC64
180 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
181 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
182 select HAVE_CONTEXT_TRACKING if PPC64
183 select HAVE_DEBUG_KMEMLEAK
184 select HAVE_DEBUG_STACKOVERFLOW
185 select HAVE_DYNAMIC_FTRACE
186 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
187 select HAVE_EBPF_JIT if PPC64
188 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
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_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
197 select HAVE_IOREMAP_PROT
198 select HAVE_IRQ_EXIT_ON_IRQ_STACK
199 select HAVE_KERNEL_GZIP
200 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
202 select HAVE_KPROBES_ON_FTRACE
203 select HAVE_KRETPROBES
204 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
205 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
206 select HAVE_MEMBLOCK_NODE_MAP
207 select HAVE_MOD_ARCH_SPECIFIC
208 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
209 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
211 select HAVE_OPTPROBES if PPC64
212 select HAVE_PERF_EVENTS
213 select HAVE_PERF_EVENTS_NMI if PPC64
214 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
215 select HAVE_PERF_REGS
216 select HAVE_PERF_USER_STACK_DUMP
217 select HAVE_RCU_TABLE_FREE if SMP
218 select HAVE_RCU_TABLE_NO_INVALIDATE if HAVE_RCU_TABLE_FREE
219 select HAVE_MMU_GATHER_PAGE_SIZE
220 select HAVE_REGS_AND_STACK_ACCESS_API
221 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
222 select HAVE_SYSCALL_TRACEPOINTS
223 select HAVE_VIRT_CPU_ACCOUNTING
224 select HAVE_IRQ_TIME_ACCOUNTING
226 select IOMMU_HELPER if PPC64
228 select IRQ_FORCED_THREADING
229 select MODULES_USE_ELF_RELA
230 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
231 select NEED_SG_DMA_LENGTH
233 select OF_EARLY_FLATTREE
234 select OLD_SIGACTION if PPC32
235 select OLD_SIGSUSPEND
236 select PCI_DOMAINS if PCI
237 select PCI_SYSCALL if PCI
240 select SYSCTL_EXCEPTION_TRACE
241 select THREAD_INFO_IN_TASK
242 select VIRT_TO_BUS if !PPC64
244 # Please keep this list sorted alphabetically.
247 config PPC_BARRIER_NOSPEC
250 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
263 select COMPAT_BINFMT_ELF
264 select ARCH_WANT_OLD_COMPAT_IPC
265 select COMPAT_OLD_SIGACTION
267 config SYSVIPC_COMPAT
269 depends on COMPAT && SYSVIPC
272 config SCHED_OMIT_FRAME_POINTER
276 config ARCH_MAY_HAVE_PC_FDC
280 config PPC_UDBG_16550
283 config GENERIC_TBSYNC
285 default y if PPC32 && SMP
296 config SYS_SUPPORTS_APM_EMULATION
297 default y if PMAC_APM_EMU
303 Used to allow a board to specify it wants an ePAPR compliant wrapper.
305 config DEFAULT_UIMAGE
308 Used to allow a board to specify it wants a uImage built by default
310 config ARCH_HIBERNATION_POSSIBLE
314 config ARCH_SUSPEND_POSSIBLE
316 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
317 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
320 config ARCH_SUSPEND_NONZERO_CPU
322 depends on PPC_POWERNV || PPC_PSERIES
324 config PPC_DCR_NATIVE
332 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
335 config PPC_OF_PLATFORM_PCI
338 depends on PPC64 # not supported on 32 bits yet
340 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
341 depends on PPC32 || PPC_BOOK3S_64
344 config ARCH_SUPPORTS_UPROBES
347 config PPC_ADV_DEBUG_REGS
349 depends on 40x || BOOKE
352 config PPC_ADV_DEBUG_IACS
354 depends on PPC_ADV_DEBUG_REGS
358 config PPC_ADV_DEBUG_DACS
360 depends on PPC_ADV_DEBUG_REGS
363 config PPC_ADV_DEBUG_DVCS
365 depends on PPC_ADV_DEBUG_REGS
369 config PPC_ADV_DEBUG_DAC_RANGE
371 depends on PPC_ADV_DEBUG_REGS && 44x
376 default y if PPC_BOOK3E_64
378 config PGTABLE_LEVELS
383 source "arch/powerpc/sysdev/Kconfig"
384 source "arch/powerpc/platforms/Kconfig"
386 menu "Kernel options"
389 bool "High memory support"
392 source "kernel/Kconfig.hz"
394 config HUGETLB_PAGE_SIZE_VARIABLE
396 depends on HUGETLB_PAGE && PPC_BOOK3S_64
399 config MATH_EMULATION
400 bool "Math emulation"
401 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
403 Some PowerPC chips designed for embedded applications do not have
404 a floating-point unit and therefore do not implement the
405 floating-point instructions in the PowerPC instruction set. If you
406 say Y here, the kernel will include code to emulate a floating-point
407 unit, which will allow programs that use floating-point
410 This is also useful to emulate missing (optional) instructions
411 such as fsqrt on cores that do have an FPU but do not implement
412 them (such as Freescale BookE).
415 prompt "Math emulation options"
416 default MATH_EMULATION_FULL
417 depends on MATH_EMULATION
419 config MATH_EMULATION_FULL
420 bool "Emulate all the floating point instructions"
422 Select this option will enable the kernel to support to emulate
423 all the floating point instructions. If your SoC doesn't have
424 a FPU, you should select this.
426 config MATH_EMULATION_HW_UNIMPLEMENTED
427 bool "Just emulate the FPU unimplemented instructions"
429 Select this if you know there does have a hardware FPU on your
430 SoC, but some floating point instructions are not implemented by that.
434 config PPC_TRANSACTIONAL_MEM
435 bool "Transactional Memory support for POWERPC"
436 depends on PPC_BOOK3S_64
441 Support user-mode Transactional Memory on POWERPC.
443 config LD_HEAD_STUB_CATCH
444 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
447 Very large kernels can cause linker branch stubs to be generated by
448 code in head_64.S, which moves the head text sections out of their
449 specified location. This option can work around the problem.
453 config MPROFILE_KERNEL
454 depends on PPC64 && CPU_LITTLE_ENDIAN
455 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
458 bool "Support for enabling/disabling CPUs"
459 depends on SMP && (PPC_PSERIES || \
460 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
462 Say Y here to be able to disable and re-enable individual
463 CPUs at runtime on SMP machines.
465 Say N if you are unsure.
467 config ARCH_CPU_PROBE_RELEASE
469 depends on HOTPLUG_CPU
471 config ARCH_ENABLE_MEMORY_HOTPLUG
474 config ARCH_ENABLE_MEMORY_HOTREMOVE
477 config PPC64_SUPPORTS_MEMORY_FAILURE
478 bool "Add support for memory hwpoison"
479 depends on PPC_BOOK3S_64
480 default "y" if PPC_POWERNV
481 select ARCH_SUPPORTS_MEMORY_FAILURE
484 bool "kexec system call"
485 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
488 kexec is a system call that implements the ability to shutdown your
489 current kernel, and to start another kernel. It is like a reboot
490 but it is independent of the system firmware. And like a reboot
491 you can start any kernel with it, not just Linux.
493 The name comes from the similarity to the exec system call.
495 It is an ongoing process to be certain the hardware in a machine
496 is properly shutdown, so do not be surprised if this code does not
497 initially work for you. As of this writing the exact hardware
498 interface is strongly in flux, so no good recommendation can be
502 bool "kexec file based system call"
504 select HAVE_IMA_KEXEC
508 depends on CRYPTO_SHA256=y
510 This is a new version of the kexec system call. This call is
511 file based and takes in file descriptors as system call arguments
512 for kernel and initramfs as opposed to a list of segments as is the
513 case for the older kexec call.
515 config ARCH_HAS_KEXEC_PURGATORY
519 bool "Build a relocatable kernel"
520 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
521 select NONSTATIC_KERNEL
522 select MODULE_REL_CRCS if MODVERSIONS
524 This builds a kernel image that is capable of running at the
525 location the kernel is loaded at. For ppc32, there is no any
526 alignment restrictions, and this feature is a superset of
527 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
528 16k-aligned base address. The kernel is linked as a
529 position-independent executable (PIE) and contains dynamic relocations
530 which are processed early in the bootup process.
532 One use is for the kexec on panic case where the recovery kernel
533 must live at a different physical address than the primary
536 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
537 it has been loaded at and the compile time physical addresses
538 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
539 setting can still be useful to bootwrappers that need to know the
540 load address of the kernel (eg. u-boot/mkimage).
542 config RELOCATABLE_TEST
543 bool "Test relocatable kernel"
544 depends on (PPC64 && RELOCATABLE)
546 This runs the relocatable kernel at the address it was initially
547 loaded at, which tends to be non-zero and therefore test the
551 bool "Build a dump capture kernel"
552 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
553 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
555 Build a kernel suitable for use as a dump capture kernel.
556 The same kernel binary can be used as production kernel and dump
560 bool "Firmware-assisted dump"
561 depends on PPC64 && PPC_RTAS
565 A robust mechanism to get reliable kernel crash dump with
566 assistance from firmware. This approach does not use kexec,
567 instead firmware assists in booting the capture kernel
568 while preserving memory contents. Firmware-assisted dump
569 is meant to be a kdump replacement offering robustness and
570 speed not possible without system firmware assistance.
575 bool "Distribute interrupts on all CPUs by default"
578 This option gives the kernel permission to distribute IRQs across
579 multiple CPUs. Saying N here will route all IRQs to the first
580 CPU. Generally saying Y is safe, although some problems have been
581 reported with SMP Power Macintoshes with this option enabled.
586 default y if SMP && PPC_PSERIES
592 depends on NEED_MULTIPLE_NODES
594 config USE_PERCPU_NUMA_NODE_ID
598 config HAVE_MEMORYLESS_NODES
602 config ARCH_SELECT_MEMORY_MODEL
606 config ARCH_FLATMEM_ENABLE
608 depends on (PPC64 && !NUMA) || PPC32
610 config ARCH_SPARSEMEM_ENABLE
613 select SPARSEMEM_VMEMMAP_ENABLE
615 config ARCH_SPARSEMEM_DEFAULT
617 depends on PPC_BOOK3S_64
619 config SYS_SUPPORTS_HUGETLBFS
622 config ILLEGAL_POINTER_VALUE
624 # This is roughly half way between the top of user space and the bottom
625 # of kernel space, which seems about as good as we can get.
626 default 0x5deadbeef0000000 if PPC64
629 config ARCH_MEMORY_PROBE
631 depends on MEMORY_HOTPLUG
633 # Some NUMA nodes have memory ranges that span
634 # other nodes. Even though a pfn is valid and
635 # between a node's start and end pfns, it may not
636 # reside on that node. See memmap_init_zone()
638 config NODES_SPAN_OTHER_NODES
640 depends on NEED_MULTIPLE_NODES
643 bool "Using standard binutils settings"
647 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
648 Note, that kernel will be able to run only those applications,
649 which had been compiled using binutils later than 2.17.50.0.3 with
650 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
651 the older binutils, you can patch them with a trivial patch, which
652 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
658 Select the kernel logical page size. Increasing the page size
659 will reduce software overhead at each page boundary, allow
660 hardware prefetch mechanisms to be more effective, and allow
661 larger dma transfers increasing IO efficiency and reducing
662 overhead. However the utilization of memory will increase.
663 For example, each cached file will using a multiple of the
664 page size to hold its contents and the difference between the
665 end of file and the end of page is wasted.
667 Some dedicated systems, such as software raid serving with
668 accelerated calculations, have shown significant increases.
670 If you configure a 64 bit kernel for 64k pages but the
671 processor does not support them, then the kernel will simulate
672 them with 4k pages, loading them on demand, but with the
673 reduced software overhead and larger internal fragmentation.
674 For the 32 bit kernel, a large page option will not be offered
675 unless it is supported by the configured processor.
677 If unsure, choose 4K_PAGES.
681 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
685 depends on 44x || PPC_8xx
689 depends on 44x || PPC_BOOK3S_64
690 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
692 config PPC_256K_PAGES
693 bool "256k page size"
694 depends on 44x && !STDBINUTILS
696 Make the page size 256k.
698 As the ELF standard only requires alignment to support page
699 sizes up to 64k, you will need to compile all of your user
700 space applications with a non-standard binutils settings
701 (see the STDBINUTILS description for details).
703 Say N unless you know what you are doing.
707 config PPC_PAGE_SHIFT
709 default 18 if PPC_256K_PAGES
710 default 16 if PPC_64K_PAGES
711 default 14 if PPC_16K_PAGES
715 int "Thread shift" if EXPERT
717 default "15" if PPC_256K_PAGES
718 default "14" if PPC64
721 Used to define the stack size. The default is almost always what you
722 want. Only change this if you know what you are doing.
724 config ETEXT_SHIFT_BOOL
725 bool "Set custom etext alignment" if STRICT_KERNEL_RWX && \
726 (PPC_BOOK3S_32 || PPC_8xx)
727 depends on ADVANCED_OPTIONS
729 This option allows you to set the kernel end of text alignment. When
730 RAM is mapped by blocks, the alignment needs to fit the size and
731 number of possible blocks. The default should be OK for most configs.
733 Say N here unless you know what you are doing.
736 int "_etext shift" if ETEXT_SHIFT_BOOL
737 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
738 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
739 default 17 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
740 default 19 if STRICT_KERNEL_RWX && PPC_8xx
741 default PPC_PAGE_SHIFT
743 On Book3S 32 (603+), IBATs are used to map kernel text.
744 Smaller is the alignment, greater is the number of necessary IBATs.
746 On 8xx, large pages (512kb or 8M) are used to map kernel linear
747 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
750 config DATA_SHIFT_BOOL
751 bool "Set custom data alignment" if STRICT_KERNEL_RWX && \
752 (PPC_BOOK3S_32 || PPC_8xx)
753 depends on ADVANCED_OPTIONS
755 This option allows you to set the kernel data alignment. When
756 RAM is mapped by blocks, the alignment needs to fit the size and
757 number of possible blocks. The default should be OK for most configs.
759 Say N here unless you know what you are doing.
762 int "Data shift" if DATA_SHIFT_BOOL
763 default 24 if STRICT_KERNEL_RWX && PPC64
764 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
765 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
766 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
767 default 23 if STRICT_KERNEL_RWX && PPC_8xx
768 default PPC_PAGE_SHIFT
770 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
771 Smaller is the alignment, greater is the number of necessary DBATs.
773 On 8xx, large pages (512kb or 8M) are used to map kernel linear
774 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
777 config FORCE_MAX_ZONEORDER
778 int "Maximum zone order"
779 range 8 9 if PPC64 && PPC_64K_PAGES
780 default "9" if PPC64 && PPC_64K_PAGES
781 range 13 13 if PPC64 && !PPC_64K_PAGES
782 default "13" if PPC64 && !PPC_64K_PAGES
783 range 9 64 if PPC32 && PPC_16K_PAGES
784 default "9" if PPC32 && PPC_16K_PAGES
785 range 7 64 if PPC32 && PPC_64K_PAGES
786 default "7" if PPC32 && PPC_64K_PAGES
787 range 5 64 if PPC32 && PPC_256K_PAGES
788 default "5" if PPC32 && PPC_256K_PAGES
792 The kernel memory allocator divides physically contiguous memory
793 blocks into "zones", where each zone is a power of two number of
794 pages. This option selects the largest power of two that the kernel
795 keeps in the memory allocator. If you need to allocate very large
796 blocks of physically contiguous memory, then you may need to
799 This config option is actually maximum order plus one. For example,
800 a value of 11 means that the largest free memory block is 2^10 pages.
802 The page size is not necessarily 4KB. For example, on 64-bit
803 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
804 this in mind when choosing a value for this option.
806 config PPC_SUBPAGE_PROT
807 bool "Support setting protections for 4k subpages"
808 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
810 This option adds support for a system call to allow user programs
811 to set access permissions (read/write, readonly, or no access)
812 on the 4k subpages of each 64k page.
814 config PPC_COPRO_BASE
818 bool "SMT (Hyperthreading) scheduler support"
819 depends on PPC64 && SMP
821 SMT scheduler support improves the CPU scheduler's decision making
822 when dealing with POWER5 cpus at a cost of slightly increased
823 overhead in some places. If unsure say N here.
825 config PPC_DENORMALISATION
826 bool "PowerPC denormalisation exception handling"
827 depends on PPC_BOOK3S_64
828 default "y" if PPC_POWERNV
830 Add support for handling denormalisation of single precision
831 values. Useful for bare metal only. If unsure say Y here.
834 bool "Default bootloader kernel arguments"
837 string "Initial kernel command string" if CMDLINE_BOOL
838 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" if CMDLINE_BOOL
841 On some platforms, there is currently no way for the boot loader to
842 pass arguments to the kernel. For these platforms, you can supply
843 some command-line options at build time by entering them here. In
844 most cases you will need to specify the root device here.
847 bool "Always use the default kernel command string"
848 depends on CMDLINE_BOOL
850 Always use the default kernel command string, even if the boot
851 loader passes other arguments to the kernel.
852 This is useful if you cannot or don't want to change the
853 command-line options your boot loader passes to the kernel.
856 string "Additional default image types"
858 List additional targets to be built by the bootwrapper here (separated
859 by spaces). This is useful for targets that depend of device tree
860 files in the .dts directory.
862 Targets in this list will be build as part of the default build
863 target, or when the user does a 'make zImage' or a
864 'make zImage.initrd'.
866 If unsure, leave blank
868 config ARCH_WANTS_FREEZER_CONTROL
872 source "kernel/power/Kconfig"
875 bool "Enable seccomp to safely compute untrusted bytecode"
879 This kernel feature is useful for number crunching applications
880 that may need to compute untrusted bytecode during their
881 execution. By using pipes or other transports made available to
882 the process as file descriptors supporting the read/write
883 syscalls, it's possible to isolate those applications in
884 their own address space using seccomp. Once seccomp is
885 enabled via /proc/<pid>/seccomp, it cannot be disabled
886 and the task is only allowed to execute a few safe syscalls
887 defined by each seccomp mode.
889 If unsure, say Y. Only embedded should say N here.
892 prompt "PowerPC Memory Protection Keys"
894 depends on PPC_BOOK3S_64
895 select ARCH_USES_HIGH_VMA_FLAGS
896 select ARCH_HAS_PKEYS
898 Memory Protection Keys provides a mechanism for enforcing
899 page-based protections, but without requiring modification of the
900 page tables when an application changes protection domains.
902 For details, see Documentation/core-api/protection-keys.rst
915 bool "Support for ISA-bus hardware"
919 Find out whether you have ISA slots on your motherboard. ISA is the
920 name of a bus system, i.e. the way the CPU talks to the other stuff
921 inside your box. If you have an Apple machine, say N here; if you
922 have an IBM RS/6000 or pSeries machine, say Y. If you have an
923 embedded board, consult your board documentation.
925 config GENERIC_ISA_DMA
927 depends on ISA_DMA_API
930 config PPC_INDIRECT_PCI
933 default y if 40x || 44x
943 select ARCH_HAS_DMA_SET_MASK
944 select PPC_INDIRECT_PCI
950 depends on SUSPEND && (PPC_85xx || PPC_86xx)
952 Freescale MPC85xx/MPC86xx power management controller support
953 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
958 depends on SUSPEND && (44x || 40x)
960 PPC4xx Clock Power Management (CPM) support (suspend/resume).
961 It also enables support for two different idle states (idle-wait
968 bool "Freescale Local Bus support"
970 Enables reporting of errors from the Freescale local bus
971 controller. Also contains some common code used by
972 drivers for specific local bus peripherals.
976 depends on PPC_83xx || QUICC_ENGINE || CPM2
978 Freescale General-purpose Timers support
982 depends on PCI && 8260
983 select PPC_INDIRECT_PCI
987 bool "Freescale Embedded SRIO Controller support"
988 depends on RAPIDIO = y && HAVE_RAPIDIO
991 Include support for RapidIO controller on Freescale embedded
992 processors (MPC8548, MPC8641, etc).
996 config NONSTATIC_KERNEL
999 menu "Advanced setup"
1002 config ADVANCED_OPTIONS
1003 bool "Prompt for advanced kernel configuration options"
1005 This option will enable prompting for a variety of advanced kernel
1006 configuration options. These options can cause the kernel to not
1007 work if they are set incorrectly, but can be used to optimize certain
1008 aspects of kernel memory management.
1010 Unless you know what you are doing, say N here.
1012 comment "Default settings for advanced configuration options are used"
1013 depends on !ADVANCED_OPTIONS
1015 config LOWMEM_SIZE_BOOL
1016 bool "Set maximum low memory"
1017 depends on ADVANCED_OPTIONS
1019 This option allows you to set the maximum amount of memory which
1020 will be used as "low memory", that is, memory which the kernel can
1021 access directly, without having to set up a kernel virtual mapping.
1022 This can be useful in optimizing the layout of kernel virtual
1025 Say N here unless you know what you are doing.
1028 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1029 default "0x30000000"
1031 config LOWMEM_CAM_NUM_BOOL
1032 bool "Set number of CAMs to use to map low memory"
1033 depends on ADVANCED_OPTIONS && FSL_BOOKE
1035 This option allows you to set the maximum number of CAM slots that
1036 will be used to map low memory. There are a limited number of slots
1037 available and even more limited number that will fit in the L1 MMU.
1038 However, using more entries will allow mapping more low memory. This
1039 can be useful in optimizing the layout of kernel virtual memory.
1041 Say N here unless you know what you are doing.
1043 config LOWMEM_CAM_NUM
1044 depends on FSL_BOOKE
1045 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1048 config DYNAMIC_MEMSTART
1049 bool "Enable page aligned dynamic load address for kernel"
1050 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1051 select NONSTATIC_KERNEL
1053 This option enables the kernel to be loaded at any page aligned
1054 physical address. The kernel creates a mapping from KERNELBASE to
1055 the address where the kernel is loaded. The page size here implies
1056 the TLB page size of the mapping for kernel on the particular platform.
1057 Please refer to the init code for finding the TLB page size.
1059 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1060 kernel image, where the only restriction is the page aligned kernel
1061 load address. When this option is enabled, the compile time physical
1062 address CONFIG_PHYSICAL_START is ignored.
1064 This option is overridden by CONFIG_RELOCATABLE
1066 config PAGE_OFFSET_BOOL
1067 bool "Set custom page offset address"
1068 depends on ADVANCED_OPTIONS
1070 This option allows you to set the kernel virtual address at which
1071 the kernel will map low memory. This can be useful in optimizing
1072 the virtual memory layout of the system.
1074 Say N here unless you know what you are doing.
1077 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1078 default "0xc0000000"
1080 config KERNEL_START_BOOL
1081 bool "Set custom kernel base address"
1082 depends on ADVANCED_OPTIONS
1084 This option allows you to set the kernel virtual address at which
1085 the kernel will be loaded. Normally this should match PAGE_OFFSET
1086 however there are times (like kdump) that one might not want them
1089 Say N here unless you know what you are doing.
1092 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1093 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1094 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1095 default "0xc0000000"
1097 config PHYSICAL_START_BOOL
1098 bool "Set physical address where the kernel is loaded"
1099 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1101 This gives the physical address where the kernel is loaded.
1103 Say N here unless you know what you are doing.
1105 config PHYSICAL_START
1106 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1107 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1108 default "0x00000000"
1110 config PHYSICAL_ALIGN
1112 default "0x04000000" if FSL_BOOKE
1114 This value puts the alignment restrictions on physical address
1115 where kernel is loaded and run from. Kernel is compiled for an
1116 address which meets above alignment restriction.
1118 config TASK_SIZE_BOOL
1119 bool "Set custom user task size"
1120 depends on ADVANCED_OPTIONS
1122 This option allows you to set the amount of virtual address space
1123 allocated to user tasks. This can be useful in optimizing the
1124 virtual memory layout of the system.
1126 Say N here unless you know what you are doing.
1129 hex "Size of user task space" if TASK_SIZE_BOOL
1130 default "0x80000000" if PPC_8xx
1131 default "0xc0000000"
1133 config CONSISTENT_SIZE_BOOL
1134 bool "Set custom consistent memory pool size"
1135 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1137 This option allows you to set the size of the
1138 consistent memory pool. This pool of virtual memory
1139 is used to make consistent memory allocations.
1141 config CONSISTENT_SIZE
1142 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1143 default "0x00200000" if NOT_COHERENT_CACHE
1146 bool "Pinned Kernel TLBs (860 ONLY)"
1147 depends on ADVANCED_OPTIONS && PPC_8xx && \
1148 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1151 bool "Pinned TLB for DATA"
1156 bool "Pinned TLB for IMMR"
1157 depends on PIN_TLB || PPC_EARLY_DEBUG_CPM
1161 bool "Pinned TLB for TEXT"
1167 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1170 default "0xc000000000000000"
1173 default "0xc000000000000000"
1174 config PHYSICAL_START
1176 default "0x00000000"
1182 config PPC_LIB_RHEAP
1185 source "arch/powerpc/kvm/Kconfig"
1187 source "kernel/livepatch/Kconfig"