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_PHYS_TO_DMA
129 select ARCH_HAS_PMEM_API if PPC64
130 select ARCH_HAS_PTE_SPECIAL
131 select ARCH_HAS_MEMBARRIER_CALLBACKS
132 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC64
133 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION)
134 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
135 select ARCH_HAS_UACCESS_FLUSHCACHE if PPC64
136 select ARCH_HAS_UBSAN_SANITIZE_ALL
137 select ARCH_HAS_ZONE_DEVICE if PPC_BOOK3S_64
138 select ARCH_HAVE_NMI_SAFE_CMPXCHG
139 select ARCH_MIGHT_HAVE_PC_PARPORT
140 select ARCH_MIGHT_HAVE_PC_SERIO
141 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
142 select ARCH_SUPPORTS_ATOMIC_RMW
143 select ARCH_USE_BUILTIN_BSWAP
144 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
145 select ARCH_WANT_IPC_PARSE_VERSION
146 select ARCH_WEAK_RELEASE_ACQUIRE
148 select BUILDTIME_EXTABLE_SORT
149 select CLONE_BACKWARDS
150 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
151 select DYNAMIC_FTRACE if FUNCTION_TRACER
152 select EDAC_ATOMIC_SCRUB
154 select GENERIC_ATOMIC64 if PPC32
155 select GENERIC_CLOCKEVENTS
156 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
157 select GENERIC_CMOS_UPDATE
158 select GENERIC_CPU_AUTOPROBE
159 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
160 select GENERIC_IRQ_SHOW
161 select GENERIC_IRQ_SHOW_LEVEL
162 select GENERIC_PCI_IOMAP if PCI
163 select GENERIC_SMP_IDLE_THREAD
164 select GENERIC_STRNCPY_FROM_USER
165 select GENERIC_STRNLEN_USER
166 select GENERIC_TIME_VSYSCALL
167 select HAVE_ARCH_AUDITSYSCALL
168 select HAVE_ARCH_JUMP_LABEL
169 select HAVE_ARCH_KGDB
170 select HAVE_ARCH_MMAP_RND_BITS
171 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
172 select HAVE_ARCH_NVRAM_OPS
173 select HAVE_ARCH_SECCOMP_FILTER
174 select HAVE_ARCH_TRACEHOOK
175 select HAVE_CBPF_JIT if !PPC64
176 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
177 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
178 select HAVE_CONTEXT_TRACKING if PPC64
179 select HAVE_DEBUG_KMEMLEAK
180 select HAVE_DEBUG_STACKOVERFLOW
181 select HAVE_DYNAMIC_FTRACE
182 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
183 select HAVE_EBPF_JIT if PPC64
184 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
185 select HAVE_FTRACE_MCOUNT_RECORD
186 select HAVE_FUNCTION_ERROR_INJECTION
187 select HAVE_FUNCTION_GRAPH_TRACER
188 select HAVE_FUNCTION_TRACER
189 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
190 select HAVE_GENERIC_GUP
191 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
193 select HAVE_IOREMAP_PROT
194 select HAVE_IRQ_EXIT_ON_IRQ_STACK
195 select HAVE_KERNEL_GZIP
196 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
198 select HAVE_KPROBES_ON_FTRACE
199 select HAVE_KRETPROBES
200 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
201 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
202 select HAVE_MEMBLOCK_NODE_MAP
203 select HAVE_MOD_ARCH_SPECIFIC
204 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
205 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
207 select HAVE_OPTPROBES if PPC64
208 select HAVE_PERF_EVENTS
209 select HAVE_PERF_EVENTS_NMI if PPC64
210 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
211 select HAVE_PERF_REGS
212 select HAVE_PERF_USER_STACK_DUMP
213 select HAVE_RCU_TABLE_FREE if SMP
214 select HAVE_RCU_TABLE_NO_INVALIDATE if HAVE_RCU_TABLE_FREE
215 select HAVE_MMU_GATHER_PAGE_SIZE
216 select HAVE_REGS_AND_STACK_ACCESS_API
217 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
218 select HAVE_SYSCALL_TRACEPOINTS
219 select HAVE_VIRT_CPU_ACCOUNTING
220 select HAVE_IRQ_TIME_ACCOUNTING
222 select IOMMU_HELPER if PPC64
224 select IRQ_FORCED_THREADING
225 select MODULES_USE_ELF_RELA
226 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
227 select NEED_SG_DMA_LENGTH
229 select OF_EARLY_FLATTREE
230 select OLD_SIGACTION if PPC32
231 select OLD_SIGSUSPEND
232 select PCI_DOMAINS if PCI
233 select PCI_SYSCALL if PCI
236 select SYSCTL_EXCEPTION_TRACE
237 select THREAD_INFO_IN_TASK
238 select VIRT_TO_BUS if !PPC64
240 # Please keep this list sorted alphabetically.
243 config PPC_BARRIER_NOSPEC
246 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
259 select COMPAT_BINFMT_ELF
260 select ARCH_WANT_OLD_COMPAT_IPC
261 select COMPAT_OLD_SIGACTION
263 config SYSVIPC_COMPAT
265 depends on COMPAT && SYSVIPC
268 config SCHED_OMIT_FRAME_POINTER
272 config ARCH_MAY_HAVE_PC_FDC
276 config PPC_UDBG_16550
279 config GENERIC_TBSYNC
281 default y if PPC32 && SMP
292 config SYS_SUPPORTS_APM_EMULATION
293 default y if PMAC_APM_EMU
299 Used to allow a board to specify it wants an ePAPR compliant wrapper.
301 config DEFAULT_UIMAGE
304 Used to allow a board to specify it wants a uImage built by default
306 config ARCH_HIBERNATION_POSSIBLE
310 config ARCH_SUSPEND_POSSIBLE
312 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
313 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
316 config ARCH_SUSPEND_NONZERO_CPU
318 depends on PPC_POWERNV || PPC_PSERIES
320 config PPC_DCR_NATIVE
328 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
331 config PPC_OF_PLATFORM_PCI
334 depends on PPC64 # not supported on 32 bits yet
336 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
337 depends on PPC32 || PPC_BOOK3S_64
340 config ARCH_SUPPORTS_UPROBES
343 config PPC_ADV_DEBUG_REGS
345 depends on 40x || BOOKE
348 config PPC_ADV_DEBUG_IACS
350 depends on PPC_ADV_DEBUG_REGS
354 config PPC_ADV_DEBUG_DACS
356 depends on PPC_ADV_DEBUG_REGS
359 config PPC_ADV_DEBUG_DVCS
361 depends on PPC_ADV_DEBUG_REGS
365 config PPC_ADV_DEBUG_DAC_RANGE
367 depends on PPC_ADV_DEBUG_REGS && 44x
372 default y if PPC_BOOK3E_64
374 config PGTABLE_LEVELS
377 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
380 source "arch/powerpc/sysdev/Kconfig"
381 source "arch/powerpc/platforms/Kconfig"
383 menu "Kernel options"
386 bool "High memory support"
389 source "kernel/Kconfig.hz"
391 config HUGETLB_PAGE_SIZE_VARIABLE
393 depends on HUGETLB_PAGE
396 config MATH_EMULATION
397 bool "Math emulation"
398 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
400 Some PowerPC chips designed for embedded applications do not have
401 a floating-point unit and therefore do not implement the
402 floating-point instructions in the PowerPC instruction set. If you
403 say Y here, the kernel will include code to emulate a floating-point
404 unit, which will allow programs that use floating-point
407 This is also useful to emulate missing (optional) instructions
408 such as fsqrt on cores that do have an FPU but do not implement
409 them (such as Freescale BookE).
412 prompt "Math emulation options"
413 default MATH_EMULATION_FULL
414 depends on MATH_EMULATION
416 config MATH_EMULATION_FULL
417 bool "Emulate all the floating point instructions"
419 Select this option will enable the kernel to support to emulate
420 all the floating point instructions. If your SoC doesn't have
421 a FPU, you should select this.
423 config MATH_EMULATION_HW_UNIMPLEMENTED
424 bool "Just emulate the FPU unimplemented instructions"
426 Select this if you know there does have a hardware FPU on your
427 SoC, but some floating point instructions are not implemented by that.
431 config PPC_TRANSACTIONAL_MEM
432 bool "Transactional Memory support for POWERPC"
433 depends on PPC_BOOK3S_64
438 Support user-mode Transactional Memory on POWERPC.
440 config LD_HEAD_STUB_CATCH
441 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
444 Very large kernels can cause linker branch stubs to be generated by
445 code in head_64.S, which moves the head text sections out of their
446 specified location. This option can work around the problem.
450 config MPROFILE_KERNEL
451 depends on PPC64 && CPU_LITTLE_ENDIAN
452 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
455 bool "Support for enabling/disabling CPUs"
456 depends on SMP && (PPC_PSERIES || \
457 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
459 Say Y here to be able to disable and re-enable individual
460 CPUs at runtime on SMP machines.
462 Say N if you are unsure.
464 config ARCH_CPU_PROBE_RELEASE
466 depends on HOTPLUG_CPU
468 config ARCH_ENABLE_MEMORY_HOTPLUG
471 config ARCH_ENABLE_MEMORY_HOTREMOVE
474 config PPC64_SUPPORTS_MEMORY_FAILURE
475 bool "Add support for memory hwpoison"
476 depends on PPC_BOOK3S_64
477 default "y" if PPC_POWERNV
478 select ARCH_SUPPORTS_MEMORY_FAILURE
481 bool "kexec system call"
482 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
485 kexec is a system call that implements the ability to shutdown your
486 current kernel, and to start another kernel. It is like a reboot
487 but it is independent of the system firmware. And like a reboot
488 you can start any kernel with it, not just Linux.
490 The name comes from the similarity to the exec system call.
492 It is an ongoing process to be certain the hardware in a machine
493 is properly shutdown, so do not be surprised if this code does not
494 initially work for you. As of this writing the exact hardware
495 interface is strongly in flux, so no good recommendation can be
499 bool "kexec file based system call"
501 select HAVE_IMA_KEXEC
505 depends on CRYPTO_SHA256=y
507 This is a new version of the kexec system call. This call is
508 file based and takes in file descriptors as system call arguments
509 for kernel and initramfs as opposed to a list of segments as is the
510 case for the older kexec call.
512 config ARCH_HAS_KEXEC_PURGATORY
516 bool "Build a relocatable kernel"
517 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
518 select NONSTATIC_KERNEL
519 select MODULE_REL_CRCS if MODVERSIONS
521 This builds a kernel image that is capable of running at the
522 location the kernel is loaded at. For ppc32, there is no any
523 alignment restrictions, and this feature is a superset of
524 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
525 16k-aligned base address. The kernel is linked as a
526 position-independent executable (PIE) and contains dynamic relocations
527 which are processed early in the bootup process.
529 One use is for the kexec on panic case where the recovery kernel
530 must live at a different physical address than the primary
533 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
534 it has been loaded at and the compile time physical addresses
535 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
536 setting can still be useful to bootwrappers that need to know the
537 load address of the kernel (eg. u-boot/mkimage).
539 config RELOCATABLE_TEST
540 bool "Test relocatable kernel"
541 depends on (PPC64 && RELOCATABLE)
543 This runs the relocatable kernel at the address it was initially
544 loaded at, which tends to be non-zero and therefore test the
548 bool "Build a dump capture kernel"
549 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
550 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
552 Build a kernel suitable for use as a dump capture kernel.
553 The same kernel binary can be used as production kernel and dump
557 bool "Firmware-assisted dump"
558 depends on PPC64 && PPC_RTAS
562 A robust mechanism to get reliable kernel crash dump with
563 assistance from firmware. This approach does not use kexec,
564 instead firmware assists in booting the capture kernel
565 while preserving memory contents. Firmware-assisted dump
566 is meant to be a kdump replacement offering robustness and
567 speed not possible without system firmware assistance.
572 bool "Distribute interrupts on all CPUs by default"
575 This option gives the kernel permission to distribute IRQs across
576 multiple CPUs. Saying N here will route all IRQs to the first
577 CPU. Generally saying Y is safe, although some problems have been
578 reported with SMP Power Macintoshes with this option enabled.
583 default y if SMP && PPC_PSERIES
589 depends on NEED_MULTIPLE_NODES
591 config USE_PERCPU_NUMA_NODE_ID
595 config HAVE_MEMORYLESS_NODES
599 config ARCH_SELECT_MEMORY_MODEL
603 config ARCH_FLATMEM_ENABLE
605 depends on (PPC64 && !NUMA) || PPC32
607 config ARCH_SPARSEMEM_ENABLE
610 select SPARSEMEM_VMEMMAP_ENABLE
612 config ARCH_SPARSEMEM_DEFAULT
614 depends on PPC_BOOK3S_64
616 config SYS_SUPPORTS_HUGETLBFS
619 config ILLEGAL_POINTER_VALUE
621 # This is roughly half way between the top of user space and the bottom
622 # of kernel space, which seems about as good as we can get.
623 default 0x5deadbeef0000000 if PPC64
626 config ARCH_MEMORY_PROBE
628 depends on MEMORY_HOTPLUG
630 # Some NUMA nodes have memory ranges that span
631 # other nodes. Even though a pfn is valid and
632 # between a node's start and end pfns, it may not
633 # reside on that node. See memmap_init_zone()
635 config NODES_SPAN_OTHER_NODES
637 depends on NEED_MULTIPLE_NODES
640 bool "Using standard binutils settings"
644 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
645 Note, that kernel will be able to run only those applications,
646 which had been compiled using binutils later than 2.17.50.0.3 with
647 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
648 the older binutils, you can patch them with a trivial patch, which
649 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
655 Select the kernel logical page size. Increasing the page size
656 will reduce software overhead at each page boundary, allow
657 hardware prefetch mechanisms to be more effective, and allow
658 larger dma transfers increasing IO efficiency and reducing
659 overhead. However the utilization of memory will increase.
660 For example, each cached file will using a multiple of the
661 page size to hold its contents and the difference between the
662 end of file and the end of page is wasted.
664 Some dedicated systems, such as software raid serving with
665 accelerated calculations, have shown significant increases.
667 If you configure a 64 bit kernel for 64k pages but the
668 processor does not support them, then the kernel will simulate
669 them with 4k pages, loading them on demand, but with the
670 reduced software overhead and larger internal fragmentation.
671 For the 32 bit kernel, a large page option will not be offered
672 unless it is supported by the configured processor.
674 If unsure, choose 4K_PAGES.
678 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
682 depends on 44x || PPC_8xx
686 depends on 44x || PPC_BOOK3S_64
687 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
689 config PPC_256K_PAGES
690 bool "256k page size"
691 depends on 44x && !STDBINUTILS
693 Make the page size 256k.
695 As the ELF standard only requires alignment to support page
696 sizes up to 64k, you will need to compile all of your user
697 space applications with a non-standard binutils settings
698 (see the STDBINUTILS description for details).
700 Say N unless you know what you are doing.
704 config PPC_PAGE_SHIFT
706 default 18 if PPC_256K_PAGES
707 default 16 if PPC_64K_PAGES
708 default 14 if PPC_16K_PAGES
712 int "Thread shift" if EXPERT
714 default "15" if PPC_256K_PAGES
715 default "14" if PPC64
718 Used to define the stack size. The default is almost always what you
719 want. Only change this if you know what you are doing.
721 config ETEXT_SHIFT_BOOL
722 bool "Set custom etext alignment" if STRICT_KERNEL_RWX && \
723 (PPC_BOOK3S_32 || PPC_8xx)
724 depends on ADVANCED_OPTIONS
726 This option allows you to set the kernel end of text alignment. When
727 RAM is mapped by blocks, the alignment needs to fit the size and
728 number of possible blocks. The default should be OK for most configs.
730 Say N here unless you know what you are doing.
733 int "_etext shift" if ETEXT_SHIFT_BOOL
734 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
735 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
736 default 17 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
737 default 19 if STRICT_KERNEL_RWX && PPC_8xx
738 default PPC_PAGE_SHIFT
740 On Book3S 32 (603+), IBATs are used to map kernel text.
741 Smaller is the alignment, greater is the number of necessary IBATs.
743 On 8xx, large pages (512kb or 8M) are used to map kernel linear
744 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
747 config DATA_SHIFT_BOOL
748 bool "Set custom data alignment" if STRICT_KERNEL_RWX && \
749 (PPC_BOOK3S_32 || PPC_8xx)
750 depends on ADVANCED_OPTIONS
752 This option allows you to set the kernel data alignment. When
753 RAM is mapped by blocks, the alignment needs to fit the size and
754 number of possible blocks. The default should be OK for most configs.
756 Say N here unless you know what you are doing.
759 int "Data shift" if DATA_SHIFT_BOOL
760 default 24 if STRICT_KERNEL_RWX && PPC64
761 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
762 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
763 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
764 default 23 if STRICT_KERNEL_RWX && PPC_8xx
765 default PPC_PAGE_SHIFT
767 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
768 Smaller is the alignment, greater is the number of necessary DBATs.
770 On 8xx, large pages (512kb or 8M) are used to map kernel linear
771 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
774 config FORCE_MAX_ZONEORDER
775 int "Maximum zone order"
776 range 8 9 if PPC64 && PPC_64K_PAGES
777 default "9" if PPC64 && PPC_64K_PAGES
778 range 13 13 if PPC64 && !PPC_64K_PAGES
779 default "13" if PPC64 && !PPC_64K_PAGES
780 range 9 64 if PPC32 && PPC_16K_PAGES
781 default "9" if PPC32 && PPC_16K_PAGES
782 range 7 64 if PPC32 && PPC_64K_PAGES
783 default "7" if PPC32 && PPC_64K_PAGES
784 range 5 64 if PPC32 && PPC_256K_PAGES
785 default "5" if PPC32 && PPC_256K_PAGES
789 The kernel memory allocator divides physically contiguous memory
790 blocks into "zones", where each zone is a power of two number of
791 pages. This option selects the largest power of two that the kernel
792 keeps in the memory allocator. If you need to allocate very large
793 blocks of physically contiguous memory, then you may need to
796 This config option is actually maximum order plus one. For example,
797 a value of 11 means that the largest free memory block is 2^10 pages.
799 The page size is not necessarily 4KB. For example, on 64-bit
800 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
801 this in mind when choosing a value for this option.
803 config PPC_SUBPAGE_PROT
804 bool "Support setting protections for 4k subpages"
805 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
807 This option adds support for a system call to allow user programs
808 to set access permissions (read/write, readonly, or no access)
809 on the 4k subpages of each 64k page.
811 config PPC_COPRO_BASE
815 bool "SMT (Hyperthreading) scheduler support"
816 depends on PPC64 && SMP
818 SMT scheduler support improves the CPU scheduler's decision making
819 when dealing with POWER5 cpus at a cost of slightly increased
820 overhead in some places. If unsure say N here.
822 config PPC_DENORMALISATION
823 bool "PowerPC denormalisation exception handling"
824 depends on PPC_BOOK3S_64
825 default "y" if PPC_POWERNV
827 Add support for handling denormalisation of single precision
828 values. Useful for bare metal only. If unsure say Y here.
831 bool "Default bootloader kernel arguments"
834 string "Initial kernel command string"
835 depends on CMDLINE_BOOL
836 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
838 On some platforms, there is currently no way for the boot loader to
839 pass arguments to the kernel. For these platforms, you can supply
840 some command-line options at build time by entering them here. In
841 most cases you will need to specify the root device here.
844 bool "Always use the default kernel command string"
845 depends on CMDLINE_BOOL
847 Always use the default kernel command string, even if the boot
848 loader passes other arguments to the kernel.
849 This is useful if you cannot or don't want to change the
850 command-line options your boot loader passes to the kernel.
853 string "Additional default image types"
855 List additional targets to be built by the bootwrapper here (separated
856 by spaces). This is useful for targets that depend of device tree
857 files in the .dts directory.
859 Targets in this list will be build as part of the default build
860 target, or when the user does a 'make zImage' or a
861 'make zImage.initrd'.
863 If unsure, leave blank
865 config ARCH_WANTS_FREEZER_CONTROL
869 source "kernel/power/Kconfig"
872 bool "Enable seccomp to safely compute untrusted bytecode"
876 This kernel feature is useful for number crunching applications
877 that may need to compute untrusted bytecode during their
878 execution. By using pipes or other transports made available to
879 the process as file descriptors supporting the read/write
880 syscalls, it's possible to isolate those applications in
881 their own address space using seccomp. Once seccomp is
882 enabled via /proc/<pid>/seccomp, it cannot be disabled
883 and the task is only allowed to execute a few safe syscalls
884 defined by each seccomp mode.
886 If unsure, say Y. Only embedded should say N here.
889 prompt "PowerPC Memory Protection Keys"
891 depends on PPC_BOOK3S_64
892 select ARCH_USES_HIGH_VMA_FLAGS
893 select ARCH_HAS_PKEYS
895 Memory Protection Keys provides a mechanism for enforcing
896 page-based protections, but without requiring modification of the
897 page tables when an application changes protection domains.
899 For details, see Documentation/vm/protection-keys.rst
912 bool "Support for ISA-bus hardware"
916 Find out whether you have ISA slots on your motherboard. ISA is the
917 name of a bus system, i.e. the way the CPU talks to the other stuff
918 inside your box. If you have an Apple machine, say N here; if you
919 have an IBM RS/6000 or pSeries machine, say Y. If you have an
920 embedded board, consult your board documentation.
922 config GENERIC_ISA_DMA
924 depends on ISA_DMA_API
927 config PPC_INDIRECT_PCI
930 default y if 40x || 44x
940 select ARCH_HAS_DMA_SET_MASK
941 select PPC_INDIRECT_PCI
947 depends on SUSPEND && (PPC_85xx || PPC_86xx)
949 Freescale MPC85xx/MPC86xx power management controller support
950 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
955 depends on SUSPEND && (44x || 40x)
957 PPC4xx Clock Power Management (CPM) support (suspend/resume).
958 It also enables support for two different idle states (idle-wait
965 bool "Freescale Local Bus support"
967 Enables reporting of errors from the Freescale local bus
968 controller. Also contains some common code used by
969 drivers for specific local bus peripherals.
973 depends on PPC_83xx || QUICC_ENGINE || CPM2
975 Freescale General-purpose Timers support
979 depends on PCI && 8260
980 select PPC_INDIRECT_PCI
984 bool "Freescale Embedded SRIO Controller support"
985 depends on RAPIDIO = y && HAVE_RAPIDIO
988 Include support for RapidIO controller on Freescale embedded
989 processors (MPC8548, MPC8641, etc).
993 config NONSTATIC_KERNEL
996 menu "Advanced setup"
999 config ADVANCED_OPTIONS
1000 bool "Prompt for advanced kernel configuration options"
1002 This option will enable prompting for a variety of advanced kernel
1003 configuration options. These options can cause the kernel to not
1004 work if they are set incorrectly, but can be used to optimize certain
1005 aspects of kernel memory management.
1007 Unless you know what you are doing, say N here.
1009 comment "Default settings for advanced configuration options are used"
1010 depends on !ADVANCED_OPTIONS
1012 config LOWMEM_SIZE_BOOL
1013 bool "Set maximum low memory"
1014 depends on ADVANCED_OPTIONS
1016 This option allows you to set the maximum amount of memory which
1017 will be used as "low memory", that is, memory which the kernel can
1018 access directly, without having to set up a kernel virtual mapping.
1019 This can be useful in optimizing the layout of kernel virtual
1022 Say N here unless you know what you are doing.
1025 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1026 default "0x30000000"
1028 config LOWMEM_CAM_NUM_BOOL
1029 bool "Set number of CAMs to use to map low memory"
1030 depends on ADVANCED_OPTIONS && FSL_BOOKE
1032 This option allows you to set the maximum number of CAM slots that
1033 will be used to map low memory. There are a limited number of slots
1034 available and even more limited number that will fit in the L1 MMU.
1035 However, using more entries will allow mapping more low memory. This
1036 can be useful in optimizing the layout of kernel virtual memory.
1038 Say N here unless you know what you are doing.
1040 config LOWMEM_CAM_NUM
1041 depends on FSL_BOOKE
1042 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1045 config DYNAMIC_MEMSTART
1046 bool "Enable page aligned dynamic load address for kernel"
1047 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1048 select NONSTATIC_KERNEL
1050 This option enables the kernel to be loaded at any page aligned
1051 physical address. The kernel creates a mapping from KERNELBASE to
1052 the address where the kernel is loaded. The page size here implies
1053 the TLB page size of the mapping for kernel on the particular platform.
1054 Please refer to the init code for finding the TLB page size.
1056 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1057 kernel image, where the only restriction is the page aligned kernel
1058 load address. When this option is enabled, the compile time physical
1059 address CONFIG_PHYSICAL_START is ignored.
1061 This option is overridden by CONFIG_RELOCATABLE
1063 config PAGE_OFFSET_BOOL
1064 bool "Set custom page offset address"
1065 depends on ADVANCED_OPTIONS
1067 This option allows you to set the kernel virtual address at which
1068 the kernel will map low memory. This can be useful in optimizing
1069 the virtual memory layout of the system.
1071 Say N here unless you know what you are doing.
1074 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1075 default "0xc0000000"
1077 config KERNEL_START_BOOL
1078 bool "Set custom kernel base address"
1079 depends on ADVANCED_OPTIONS
1081 This option allows you to set the kernel virtual address at which
1082 the kernel will be loaded. Normally this should match PAGE_OFFSET
1083 however there are times (like kdump) that one might not want them
1086 Say N here unless you know what you are doing.
1089 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1090 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1091 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1092 default "0xc0000000"
1094 config PHYSICAL_START_BOOL
1095 bool "Set physical address where the kernel is loaded"
1096 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1098 This gives the physical address where the kernel is loaded.
1100 Say N here unless you know what you are doing.
1102 config PHYSICAL_START
1103 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1104 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1105 default "0x00000000"
1107 config PHYSICAL_ALIGN
1109 default "0x04000000" if FSL_BOOKE
1111 This value puts the alignment restrictions on physical address
1112 where kernel is loaded and run from. Kernel is compiled for an
1113 address which meets above alignment restriction.
1115 config TASK_SIZE_BOOL
1116 bool "Set custom user task size"
1117 depends on ADVANCED_OPTIONS
1119 This option allows you to set the amount of virtual address space
1120 allocated to user tasks. This can be useful in optimizing the
1121 virtual memory layout of the system.
1123 Say N here unless you know what you are doing.
1126 hex "Size of user task space" if TASK_SIZE_BOOL
1127 default "0x80000000" if PPC_8xx
1128 default "0xc0000000"
1130 config CONSISTENT_SIZE_BOOL
1131 bool "Set custom consistent memory pool size"
1132 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1134 This option allows you to set the size of the
1135 consistent memory pool. This pool of virtual memory
1136 is used to make consistent memory allocations.
1138 config CONSISTENT_SIZE
1139 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1140 default "0x00200000" if NOT_COHERENT_CACHE
1143 bool "Pinned Kernel TLBs (860 ONLY)"
1144 depends on ADVANCED_OPTIONS && PPC_8xx && \
1145 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1148 bool "Pinned TLB for DATA"
1153 bool "Pinned TLB for IMMR"
1154 depends on PIN_TLB || PPC_EARLY_DEBUG_CPM
1158 bool "Pinned TLB for TEXT"
1164 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1167 default "0xc000000000000000"
1170 default "0xc000000000000000"
1171 config PHYSICAL_START
1173 default "0x00000000"
1179 config PPC_LIB_RHEAP
1182 source "arch/powerpc/kvm/Kconfig"
1184 source "kernel/livepatch/Kconfig"