1 # SPDX-License-Identifier: GPL-2.0
2 source "arch/powerpc/platforms/Kconfig.cputype"
20 config ARCH_MMAP_RND_BITS_MAX
21 # On Book3S 64, the default virtual address space for 64-bit processes
22 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
23 # 32T of address space (2^45), which should ensure a reasonable gap
24 # between bottom-up and top-down allocations for applications that
25 # consume "normal" amounts of address space. Book3S 64 only supports 64K
27 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
28 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K)
30 # On all other 64-bit platforms (currently only Book3E), the virtual
31 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
32 # of address space (2^44). Only 4K page sizes are supported.
33 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K)
35 # For 32-bit, use the compat values, as they're the same.
36 default ARCH_MMAP_RND_COMPAT_BITS_MAX
38 config ARCH_MMAP_RND_BITS_MIN
39 # Allow randomisation to consume up to 1GB of address space (2^30).
40 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K)
41 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K)
43 # For 32-bit, use the compat values, as they're the same.
44 default ARCH_MMAP_RND_COMPAT_BITS_MIN
46 config ARCH_MMAP_RND_COMPAT_BITS_MAX
47 # Total virtual address space for 32-bit processes is 2^31 (2GB).
48 # Allow randomisation to consume up to 512MB of address space (2^29).
49 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K)
50 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K)
51 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K)
52 default 17 # 17 = 29 (512MB) - 12 (4K)
54 config ARCH_MMAP_RND_COMPAT_BITS_MIN
55 # Total virtual address space for 32-bit processes is 2^31 (2GB).
56 # Allow randomisation to consume up to 8MB of address space (2^23).
57 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K)
58 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K)
59 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K)
60 default 11 # 11 = 23 (8MB) - 12 (4K)
62 config HAVE_SETUP_PER_CPU_AREA
65 config NEED_PER_CPU_EMBED_FIRST_CHUNK
69 int "Number of virtual interrupt numbers"
73 This defines the number of virtual interrupt numbers the kernel
74 can manage. Virtual interrupt numbers are what you see in
75 /proc/interrupts. If you configure your system to have too few,
76 drivers will fail to load or worse - handle with care.
80 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
85 depends on HARDLOCKUP_DETECTOR
86 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
89 This is a placeholder when the powerpc hardlockup detector
90 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
91 seleted via the generic lockup detector menu which is why we
92 have no standalone config option for it here.
94 config STACKTRACE_SUPPORT
98 config TRACE_IRQFLAGS_SUPPORT
102 config LOCKDEP_SUPPORT
106 config GENERIC_LOCKBREAK
109 depends on SMP && PREEMPT
111 config GENERIC_HWEIGHT
119 # Please keep this list sorted alphabetically.
121 select ARCH_32BIT_OFF_T if PPC32
122 select ARCH_HAS_DEBUG_VIRTUAL
123 select ARCH_HAS_DEVMEM_IS_ALLOWED
124 select ARCH_HAS_ELF_RANDOMIZE
125 select ARCH_HAS_FORTIFY_SOURCE
126 select ARCH_HAS_GCOV_PROFILE_ALL
128 select ARCH_HAS_MMIOWB if PPC64
129 select ARCH_HAS_PHYS_TO_DMA
130 select ARCH_HAS_PMEM_API if PPC64
131 select ARCH_HAS_PTE_SPECIAL
132 select ARCH_HAS_MEMBARRIER_CALLBACKS
133 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC64
134 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION)
135 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
136 select ARCH_HAS_UACCESS_FLUSHCACHE if PPC64
137 select ARCH_HAS_UBSAN_SANITIZE_ALL
138 select ARCH_HAS_ZONE_DEVICE if PPC_BOOK3S_64
139 select ARCH_HAVE_NMI_SAFE_CMPXCHG
140 select ARCH_MIGHT_HAVE_PC_PARPORT
141 select ARCH_MIGHT_HAVE_PC_SERIO
142 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
143 select ARCH_SUPPORTS_ATOMIC_RMW
144 select ARCH_USE_BUILTIN_BSWAP
145 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
146 select ARCH_WANT_IPC_PARSE_VERSION
147 select ARCH_WEAK_RELEASE_ACQUIRE
149 select BUILDTIME_EXTABLE_SORT
150 select CLONE_BACKWARDS
151 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
152 select DYNAMIC_FTRACE if FUNCTION_TRACER
153 select EDAC_ATOMIC_SCRUB
155 select GENERIC_ATOMIC64 if PPC32
156 select GENERIC_CLOCKEVENTS
157 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
158 select GENERIC_CMOS_UPDATE
159 select GENERIC_CPU_AUTOPROBE
160 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
161 select GENERIC_IRQ_SHOW
162 select GENERIC_IRQ_SHOW_LEVEL
163 select GENERIC_PCI_IOMAP if PCI
164 select GENERIC_SMP_IDLE_THREAD
165 select GENERIC_STRNCPY_FROM_USER
166 select GENERIC_STRNLEN_USER
167 select GENERIC_TIME_VSYSCALL
168 select HAVE_ARCH_AUDITSYSCALL
169 select HAVE_ARCH_JUMP_LABEL
170 select HAVE_ARCH_KASAN if PPC32
171 select HAVE_ARCH_KGDB
172 select HAVE_ARCH_MMAP_RND_BITS
173 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
174 select HAVE_ARCH_NVRAM_OPS
175 select HAVE_ARCH_SECCOMP_FILTER
176 select HAVE_ARCH_TRACEHOOK
177 select HAVE_CBPF_JIT if !PPC64
178 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
179 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
180 select HAVE_CONTEXT_TRACKING if PPC64
181 select HAVE_DEBUG_KMEMLEAK
182 select HAVE_DEBUG_STACKOVERFLOW
183 select HAVE_DYNAMIC_FTRACE
184 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
185 select HAVE_EBPF_JIT if PPC64
186 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
187 select HAVE_FTRACE_MCOUNT_RECORD
188 select HAVE_FUNCTION_ERROR_INJECTION
189 select HAVE_FUNCTION_GRAPH_TRACER
190 select HAVE_FUNCTION_TRACER
191 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
192 select HAVE_GENERIC_GUP
193 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
195 select HAVE_IOREMAP_PROT
196 select HAVE_IRQ_EXIT_ON_IRQ_STACK
197 select HAVE_KERNEL_GZIP
198 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
200 select HAVE_KPROBES_ON_FTRACE
201 select HAVE_KRETPROBES
202 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
203 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
204 select HAVE_MEMBLOCK_NODE_MAP
205 select HAVE_MOD_ARCH_SPECIFIC
206 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
207 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
209 select HAVE_OPTPROBES if PPC64
210 select HAVE_PERF_EVENTS
211 select HAVE_PERF_EVENTS_NMI if PPC64
212 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
213 select HAVE_PERF_REGS
214 select HAVE_PERF_USER_STACK_DUMP
215 select HAVE_RCU_TABLE_FREE if SMP
216 select HAVE_RCU_TABLE_NO_INVALIDATE if HAVE_RCU_TABLE_FREE
217 select HAVE_MMU_GATHER_PAGE_SIZE
218 select HAVE_REGS_AND_STACK_ACCESS_API
219 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
220 select HAVE_SYSCALL_TRACEPOINTS
221 select HAVE_VIRT_CPU_ACCOUNTING
222 select HAVE_IRQ_TIME_ACCOUNTING
224 select IOMMU_HELPER if PPC64
226 select IRQ_FORCED_THREADING
227 select MODULES_USE_ELF_RELA
228 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
229 select NEED_SG_DMA_LENGTH
231 select OF_EARLY_FLATTREE
232 select OLD_SIGACTION if PPC32
233 select OLD_SIGSUSPEND
234 select PCI_DOMAINS if PCI
235 select PCI_SYSCALL if PCI
238 select SYSCTL_EXCEPTION_TRACE
239 select THREAD_INFO_IN_TASK
240 select VIRT_TO_BUS if !PPC64
242 # Please keep this list sorted alphabetically.
245 config PPC_BARRIER_NOSPEC
248 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
261 select COMPAT_BINFMT_ELF
262 select ARCH_WANT_OLD_COMPAT_IPC
263 select COMPAT_OLD_SIGACTION
265 config SYSVIPC_COMPAT
267 depends on COMPAT && SYSVIPC
270 config SCHED_OMIT_FRAME_POINTER
274 config ARCH_MAY_HAVE_PC_FDC
278 config PPC_UDBG_16550
281 config GENERIC_TBSYNC
283 default y if PPC32 && SMP
294 config SYS_SUPPORTS_APM_EMULATION
295 default y if PMAC_APM_EMU
301 Used to allow a board to specify it wants an ePAPR compliant wrapper.
303 config DEFAULT_UIMAGE
306 Used to allow a board to specify it wants a uImage built by default
308 config ARCH_HIBERNATION_POSSIBLE
312 config ARCH_SUSPEND_POSSIBLE
314 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
315 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
318 config ARCH_SUSPEND_NONZERO_CPU
320 depends on PPC_POWERNV || PPC_PSERIES
322 config PPC_DCR_NATIVE
330 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
333 config PPC_OF_PLATFORM_PCI
336 depends on PPC64 # not supported on 32 bits yet
338 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
339 depends on PPC32 || PPC_BOOK3S_64
342 config ARCH_SUPPORTS_UPROBES
345 config PPC_ADV_DEBUG_REGS
347 depends on 40x || BOOKE
350 config PPC_ADV_DEBUG_IACS
352 depends on PPC_ADV_DEBUG_REGS
356 config PPC_ADV_DEBUG_DACS
358 depends on PPC_ADV_DEBUG_REGS
361 config PPC_ADV_DEBUG_DVCS
363 depends on PPC_ADV_DEBUG_REGS
367 config PPC_ADV_DEBUG_DAC_RANGE
369 depends on PPC_ADV_DEBUG_REGS && 44x
374 default y if PPC_BOOK3E_64
376 config PGTABLE_LEVELS
381 source "arch/powerpc/sysdev/Kconfig"
382 source "arch/powerpc/platforms/Kconfig"
384 menu "Kernel options"
387 bool "High memory support"
390 source "kernel/Kconfig.hz"
392 config HUGETLB_PAGE_SIZE_VARIABLE
394 depends on HUGETLB_PAGE && PPC_BOOK3S_64
397 config MATH_EMULATION
398 bool "Math emulation"
399 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
401 Some PowerPC chips designed for embedded applications do not have
402 a floating-point unit and therefore do not implement the
403 floating-point instructions in the PowerPC instruction set. If you
404 say Y here, the kernel will include code to emulate a floating-point
405 unit, which will allow programs that use floating-point
408 This is also useful to emulate missing (optional) instructions
409 such as fsqrt on cores that do have an FPU but do not implement
410 them (such as Freescale BookE).
413 prompt "Math emulation options"
414 default MATH_EMULATION_FULL
415 depends on MATH_EMULATION
417 config MATH_EMULATION_FULL
418 bool "Emulate all the floating point instructions"
420 Select this option will enable the kernel to support to emulate
421 all the floating point instructions. If your SoC doesn't have
422 a FPU, you should select this.
424 config MATH_EMULATION_HW_UNIMPLEMENTED
425 bool "Just emulate the FPU unimplemented instructions"
427 Select this if you know there does have a hardware FPU on your
428 SoC, but some floating point instructions are not implemented by that.
432 config PPC_TRANSACTIONAL_MEM
433 bool "Transactional Memory support for POWERPC"
434 depends on PPC_BOOK3S_64
439 Support user-mode Transactional Memory on POWERPC.
441 config LD_HEAD_STUB_CATCH
442 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
445 Very large kernels can cause linker branch stubs to be generated by
446 code in head_64.S, which moves the head text sections out of their
447 specified location. This option can work around the problem.
451 config MPROFILE_KERNEL
452 depends on PPC64 && CPU_LITTLE_ENDIAN
453 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
456 bool "Support for enabling/disabling CPUs"
457 depends on SMP && (PPC_PSERIES || \
458 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
460 Say Y here to be able to disable and re-enable individual
461 CPUs at runtime on SMP machines.
463 Say N if you are unsure.
465 config ARCH_CPU_PROBE_RELEASE
467 depends on HOTPLUG_CPU
469 config ARCH_ENABLE_MEMORY_HOTPLUG
472 config ARCH_ENABLE_MEMORY_HOTREMOVE
475 config PPC64_SUPPORTS_MEMORY_FAILURE
476 bool "Add support for memory hwpoison"
477 depends on PPC_BOOK3S_64
478 default "y" if PPC_POWERNV
479 select ARCH_SUPPORTS_MEMORY_FAILURE
482 bool "kexec system call"
483 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
486 kexec is a system call that implements the ability to shutdown your
487 current kernel, and to start another kernel. It is like a reboot
488 but it is independent of the system firmware. And like a reboot
489 you can start any kernel with it, not just Linux.
491 The name comes from the similarity to the exec system call.
493 It is an ongoing process to be certain the hardware in a machine
494 is properly shutdown, so do not be surprised if this code does not
495 initially work for you. As of this writing the exact hardware
496 interface is strongly in flux, so no good recommendation can be
500 bool "kexec file based system call"
502 select HAVE_IMA_KEXEC
506 depends on CRYPTO_SHA256=y
508 This is a new version of the kexec system call. This call is
509 file based and takes in file descriptors as system call arguments
510 for kernel and initramfs as opposed to a list of segments as is the
511 case for the older kexec call.
513 config ARCH_HAS_KEXEC_PURGATORY
517 bool "Build a relocatable kernel"
518 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
519 select NONSTATIC_KERNEL
520 select MODULE_REL_CRCS if MODVERSIONS
522 This builds a kernel image that is capable of running at the
523 location the kernel is loaded at. For ppc32, there is no any
524 alignment restrictions, and this feature is a superset of
525 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
526 16k-aligned base address. The kernel is linked as a
527 position-independent executable (PIE) and contains dynamic relocations
528 which are processed early in the bootup process.
530 One use is for the kexec on panic case where the recovery kernel
531 must live at a different physical address than the primary
534 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
535 it has been loaded at and the compile time physical addresses
536 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
537 setting can still be useful to bootwrappers that need to know the
538 load address of the kernel (eg. u-boot/mkimage).
540 config RELOCATABLE_TEST
541 bool "Test relocatable kernel"
542 depends on (PPC64 && RELOCATABLE)
544 This runs the relocatable kernel at the address it was initially
545 loaded at, which tends to be non-zero and therefore test the
549 bool "Build a dump capture kernel"
550 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
551 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
553 Build a kernel suitable for use as a dump capture kernel.
554 The same kernel binary can be used as production kernel and dump
558 bool "Firmware-assisted dump"
559 depends on PPC64 && PPC_RTAS
563 A robust mechanism to get reliable kernel crash dump with
564 assistance from firmware. This approach does not use kexec,
565 instead firmware assists in booting the capture kernel
566 while preserving memory contents. Firmware-assisted dump
567 is meant to be a kdump replacement offering robustness and
568 speed not possible without system firmware assistance.
573 bool "Distribute interrupts on all CPUs by default"
576 This option gives the kernel permission to distribute IRQs across
577 multiple CPUs. Saying N here will route all IRQs to the first
578 CPU. Generally saying Y is safe, although some problems have been
579 reported with SMP Power Macintoshes with this option enabled.
584 default y if SMP && PPC_PSERIES
590 depends on NEED_MULTIPLE_NODES
592 config USE_PERCPU_NUMA_NODE_ID
596 config HAVE_MEMORYLESS_NODES
600 config ARCH_SELECT_MEMORY_MODEL
604 config ARCH_FLATMEM_ENABLE
606 depends on (PPC64 && !NUMA) || PPC32
608 config ARCH_SPARSEMEM_ENABLE
611 select SPARSEMEM_VMEMMAP_ENABLE
613 config ARCH_SPARSEMEM_DEFAULT
615 depends on PPC_BOOK3S_64
617 config SYS_SUPPORTS_HUGETLBFS
620 config ILLEGAL_POINTER_VALUE
622 # This is roughly half way between the top of user space and the bottom
623 # of kernel space, which seems about as good as we can get.
624 default 0x5deadbeef0000000 if PPC64
627 config ARCH_MEMORY_PROBE
629 depends on MEMORY_HOTPLUG
631 # Some NUMA nodes have memory ranges that span
632 # other nodes. Even though a pfn is valid and
633 # between a node's start and end pfns, it may not
634 # reside on that node. See memmap_init_zone()
636 config NODES_SPAN_OTHER_NODES
638 depends on NEED_MULTIPLE_NODES
641 bool "Using standard binutils settings"
645 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
646 Note, that kernel will be able to run only those applications,
647 which had been compiled using binutils later than 2.17.50.0.3 with
648 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
649 the older binutils, you can patch them with a trivial patch, which
650 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
656 Select the kernel logical page size. Increasing the page size
657 will reduce software overhead at each page boundary, allow
658 hardware prefetch mechanisms to be more effective, and allow
659 larger dma transfers increasing IO efficiency and reducing
660 overhead. However the utilization of memory will increase.
661 For example, each cached file will using a multiple of the
662 page size to hold its contents and the difference between the
663 end of file and the end of page is wasted.
665 Some dedicated systems, such as software raid serving with
666 accelerated calculations, have shown significant increases.
668 If you configure a 64 bit kernel for 64k pages but the
669 processor does not support them, then the kernel will simulate
670 them with 4k pages, loading them on demand, but with the
671 reduced software overhead and larger internal fragmentation.
672 For the 32 bit kernel, a large page option will not be offered
673 unless it is supported by the configured processor.
675 If unsure, choose 4K_PAGES.
679 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
683 depends on 44x || PPC_8xx
687 depends on 44x || PPC_BOOK3S_64
688 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
690 config PPC_256K_PAGES
691 bool "256k page size"
692 depends on 44x && !STDBINUTILS
694 Make the page size 256k.
696 As the ELF standard only requires alignment to support page
697 sizes up to 64k, you will need to compile all of your user
698 space applications with a non-standard binutils settings
699 (see the STDBINUTILS description for details).
701 Say N unless you know what you are doing.
705 config PPC_PAGE_SHIFT
707 default 18 if PPC_256K_PAGES
708 default 16 if PPC_64K_PAGES
709 default 14 if PPC_16K_PAGES
713 int "Thread shift" if EXPERT
715 default "15" if PPC_256K_PAGES
716 default "14" if PPC64
719 Used to define the stack size. The default is almost always what you
720 want. Only change this if you know what you are doing.
722 config ETEXT_SHIFT_BOOL
723 bool "Set custom etext alignment" if STRICT_KERNEL_RWX && \
724 (PPC_BOOK3S_32 || PPC_8xx)
725 depends on ADVANCED_OPTIONS
727 This option allows you to set the kernel end of text alignment. When
728 RAM is mapped by blocks, the alignment needs to fit the size and
729 number of possible blocks. The default should be OK for most configs.
731 Say N here unless you know what you are doing.
734 int "_etext shift" if ETEXT_SHIFT_BOOL
735 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
736 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
737 default 17 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
738 default 19 if STRICT_KERNEL_RWX && PPC_8xx
739 default PPC_PAGE_SHIFT
741 On Book3S 32 (603+), IBATs are used to map kernel text.
742 Smaller is the alignment, greater is the number of necessary IBATs.
744 On 8xx, large pages (512kb or 8M) are used to map kernel linear
745 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
748 config DATA_SHIFT_BOOL
749 bool "Set custom data alignment" if STRICT_KERNEL_RWX && \
750 (PPC_BOOK3S_32 || PPC_8xx)
751 depends on ADVANCED_OPTIONS
753 This option allows you to set the kernel data alignment. When
754 RAM is mapped by blocks, the alignment needs to fit the size and
755 number of possible blocks. The default should be OK for most configs.
757 Say N here unless you know what you are doing.
760 int "Data shift" if DATA_SHIFT_BOOL
761 default 24 if STRICT_KERNEL_RWX && PPC64
762 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
763 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
764 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
765 default 23 if STRICT_KERNEL_RWX && PPC_8xx
766 default PPC_PAGE_SHIFT
768 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
769 Smaller is the alignment, greater is the number of necessary DBATs.
771 On 8xx, large pages (512kb or 8M) are used to map kernel linear
772 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
775 config FORCE_MAX_ZONEORDER
776 int "Maximum zone order"
777 range 8 9 if PPC64 && PPC_64K_PAGES
778 default "9" if PPC64 && PPC_64K_PAGES
779 range 13 13 if PPC64 && !PPC_64K_PAGES
780 default "13" if PPC64 && !PPC_64K_PAGES
781 range 9 64 if PPC32 && PPC_16K_PAGES
782 default "9" if PPC32 && PPC_16K_PAGES
783 range 7 64 if PPC32 && PPC_64K_PAGES
784 default "7" if PPC32 && PPC_64K_PAGES
785 range 5 64 if PPC32 && PPC_256K_PAGES
786 default "5" if PPC32 && PPC_256K_PAGES
790 The kernel memory allocator divides physically contiguous memory
791 blocks into "zones", where each zone is a power of two number of
792 pages. This option selects the largest power of two that the kernel
793 keeps in the memory allocator. If you need to allocate very large
794 blocks of physically contiguous memory, then you may need to
797 This config option is actually maximum order plus one. For example,
798 a value of 11 means that the largest free memory block is 2^10 pages.
800 The page size is not necessarily 4KB. For example, on 64-bit
801 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
802 this in mind when choosing a value for this option.
804 config PPC_SUBPAGE_PROT
805 bool "Support setting protections for 4k subpages"
806 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
808 This option adds support for a system call to allow user programs
809 to set access permissions (read/write, readonly, or no access)
810 on the 4k subpages of each 64k page.
812 config PPC_COPRO_BASE
816 bool "SMT (Hyperthreading) scheduler support"
817 depends on PPC64 && SMP
819 SMT scheduler support improves the CPU scheduler's decision making
820 when dealing with POWER5 cpus at a cost of slightly increased
821 overhead in some places. If unsure say N here.
823 config PPC_DENORMALISATION
824 bool "PowerPC denormalisation exception handling"
825 depends on PPC_BOOK3S_64
826 default "y" if PPC_POWERNV
828 Add support for handling denormalisation of single precision
829 values. Useful for bare metal only. If unsure say Y here.
832 bool "Default bootloader kernel arguments"
835 string "Initial kernel command string" if CMDLINE_BOOL
836 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" if CMDLINE_BOOL
839 On some platforms, there is currently no way for the boot loader to
840 pass arguments to the kernel. For these platforms, you can supply
841 some command-line options at build time by entering them here. In
842 most cases you will need to specify the root device here.
845 bool "Always use the default kernel command string"
846 depends on CMDLINE_BOOL
848 Always use the default kernel command string, even if the boot
849 loader passes other arguments to the kernel.
850 This is useful if you cannot or don't want to change the
851 command-line options your boot loader passes to the kernel.
854 string "Additional default image types"
856 List additional targets to be built by the bootwrapper here (separated
857 by spaces). This is useful for targets that depend of device tree
858 files in the .dts directory.
860 Targets in this list will be build as part of the default build
861 target, or when the user does a 'make zImage' or a
862 'make zImage.initrd'.
864 If unsure, leave blank
866 config ARCH_WANTS_FREEZER_CONTROL
870 source "kernel/power/Kconfig"
873 bool "Enable seccomp to safely compute untrusted bytecode"
877 This kernel feature is useful for number crunching applications
878 that may need to compute untrusted bytecode during their
879 execution. By using pipes or other transports made available to
880 the process as file descriptors supporting the read/write
881 syscalls, it's possible to isolate those applications in
882 their own address space using seccomp. Once seccomp is
883 enabled via /proc/<pid>/seccomp, it cannot be disabled
884 and the task is only allowed to execute a few safe syscalls
885 defined by each seccomp mode.
887 If unsure, say Y. Only embedded should say N here.
890 prompt "PowerPC Memory Protection Keys"
892 depends on PPC_BOOK3S_64
893 select ARCH_USES_HIGH_VMA_FLAGS
894 select ARCH_HAS_PKEYS
896 Memory Protection Keys provides a mechanism for enforcing
897 page-based protections, but without requiring modification of the
898 page tables when an application changes protection domains.
900 For details, see Documentation/vm/protection-keys.rst
913 bool "Support for ISA-bus hardware"
917 Find out whether you have ISA slots on your motherboard. ISA is the
918 name of a bus system, i.e. the way the CPU talks to the other stuff
919 inside your box. If you have an Apple machine, say N here; if you
920 have an IBM RS/6000 or pSeries machine, say Y. If you have an
921 embedded board, consult your board documentation.
923 config GENERIC_ISA_DMA
925 depends on ISA_DMA_API
928 config PPC_INDIRECT_PCI
931 default y if 40x || 44x
941 select ARCH_HAS_DMA_SET_MASK
942 select PPC_INDIRECT_PCI
948 depends on SUSPEND && (PPC_85xx || PPC_86xx)
950 Freescale MPC85xx/MPC86xx power management controller support
951 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
956 depends on SUSPEND && (44x || 40x)
958 PPC4xx Clock Power Management (CPM) support (suspend/resume).
959 It also enables support for two different idle states (idle-wait
966 bool "Freescale Local Bus support"
968 Enables reporting of errors from the Freescale local bus
969 controller. Also contains some common code used by
970 drivers for specific local bus peripherals.
974 depends on PPC_83xx || QUICC_ENGINE || CPM2
976 Freescale General-purpose Timers support
980 depends on PCI && 8260
981 select PPC_INDIRECT_PCI
985 bool "Freescale Embedded SRIO Controller support"
986 depends on RAPIDIO = y && HAVE_RAPIDIO
989 Include support for RapidIO controller on Freescale embedded
990 processors (MPC8548, MPC8641, etc).
994 config NONSTATIC_KERNEL
997 menu "Advanced setup"
1000 config ADVANCED_OPTIONS
1001 bool "Prompt for advanced kernel configuration options"
1003 This option will enable prompting for a variety of advanced kernel
1004 configuration options. These options can cause the kernel to not
1005 work if they are set incorrectly, but can be used to optimize certain
1006 aspects of kernel memory management.
1008 Unless you know what you are doing, say N here.
1010 comment "Default settings for advanced configuration options are used"
1011 depends on !ADVANCED_OPTIONS
1013 config LOWMEM_SIZE_BOOL
1014 bool "Set maximum low memory"
1015 depends on ADVANCED_OPTIONS
1017 This option allows you to set the maximum amount of memory which
1018 will be used as "low memory", that is, memory which the kernel can
1019 access directly, without having to set up a kernel virtual mapping.
1020 This can be useful in optimizing the layout of kernel virtual
1023 Say N here unless you know what you are doing.
1026 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1027 default "0x30000000"
1029 config LOWMEM_CAM_NUM_BOOL
1030 bool "Set number of CAMs to use to map low memory"
1031 depends on ADVANCED_OPTIONS && FSL_BOOKE
1033 This option allows you to set the maximum number of CAM slots that
1034 will be used to map low memory. There are a limited number of slots
1035 available and even more limited number that will fit in the L1 MMU.
1036 However, using more entries will allow mapping more low memory. This
1037 can be useful in optimizing the layout of kernel virtual memory.
1039 Say N here unless you know what you are doing.
1041 config LOWMEM_CAM_NUM
1042 depends on FSL_BOOKE
1043 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1046 config DYNAMIC_MEMSTART
1047 bool "Enable page aligned dynamic load address for kernel"
1048 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1049 select NONSTATIC_KERNEL
1051 This option enables the kernel to be loaded at any page aligned
1052 physical address. The kernel creates a mapping from KERNELBASE to
1053 the address where the kernel is loaded. The page size here implies
1054 the TLB page size of the mapping for kernel on the particular platform.
1055 Please refer to the init code for finding the TLB page size.
1057 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1058 kernel image, where the only restriction is the page aligned kernel
1059 load address. When this option is enabled, the compile time physical
1060 address CONFIG_PHYSICAL_START is ignored.
1062 This option is overridden by CONFIG_RELOCATABLE
1064 config PAGE_OFFSET_BOOL
1065 bool "Set custom page offset address"
1066 depends on ADVANCED_OPTIONS
1068 This option allows you to set the kernel virtual address at which
1069 the kernel will map low memory. This can be useful in optimizing
1070 the virtual memory layout of the system.
1072 Say N here unless you know what you are doing.
1075 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1076 default "0xc0000000"
1078 config KERNEL_START_BOOL
1079 bool "Set custom kernel base address"
1080 depends on ADVANCED_OPTIONS
1082 This option allows you to set the kernel virtual address at which
1083 the kernel will be loaded. Normally this should match PAGE_OFFSET
1084 however there are times (like kdump) that one might not want them
1087 Say N here unless you know what you are doing.
1090 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1091 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1092 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1093 default "0xc0000000"
1095 config PHYSICAL_START_BOOL
1096 bool "Set physical address where the kernel is loaded"
1097 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1099 This gives the physical address where the kernel is loaded.
1101 Say N here unless you know what you are doing.
1103 config PHYSICAL_START
1104 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1105 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1106 default "0x00000000"
1108 config PHYSICAL_ALIGN
1110 default "0x04000000" if FSL_BOOKE
1112 This value puts the alignment restrictions on physical address
1113 where kernel is loaded and run from. Kernel is compiled for an
1114 address which meets above alignment restriction.
1116 config TASK_SIZE_BOOL
1117 bool "Set custom user task size"
1118 depends on ADVANCED_OPTIONS
1120 This option allows you to set the amount of virtual address space
1121 allocated to user tasks. This can be useful in optimizing the
1122 virtual memory layout of the system.
1124 Say N here unless you know what you are doing.
1127 hex "Size of user task space" if TASK_SIZE_BOOL
1128 default "0x80000000" if PPC_8xx
1129 default "0xc0000000"
1131 config CONSISTENT_SIZE_BOOL
1132 bool "Set custom consistent memory pool size"
1133 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1135 This option allows you to set the size of the
1136 consistent memory pool. This pool of virtual memory
1137 is used to make consistent memory allocations.
1139 config CONSISTENT_SIZE
1140 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1141 default "0x00200000" if NOT_COHERENT_CACHE
1144 bool "Pinned Kernel TLBs (860 ONLY)"
1145 depends on ADVANCED_OPTIONS && PPC_8xx && \
1146 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1149 bool "Pinned TLB for DATA"
1154 bool "Pinned TLB for IMMR"
1155 depends on PIN_TLB || PPC_EARLY_DEBUG_CPM
1159 bool "Pinned TLB for TEXT"
1165 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1168 default "0xc000000000000000"
1171 default "0xc000000000000000"
1172 config PHYSICAL_START
1174 default "0x00000000"
1180 config PPC_LIB_RHEAP
1183 source "arch/powerpc/kvm/Kconfig"
1185 source "kernel/livepatch/Kconfig"