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
132 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
133 select ARCH_HAS_PTE_SPECIAL
134 select ARCH_HAS_MEMBARRIER_CALLBACKS
135 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
136 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION)
137 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
138 select ARCH_HAS_UACCESS_FLUSHCACHE
139 select ARCH_HAS_UACCESS_MCSAFE if PPC64
140 select ARCH_HAS_UBSAN_SANITIZE_ALL
141 select ARCH_HAVE_NMI_SAFE_CMPXCHG
142 select ARCH_KEEP_MEMBLOCK
143 select ARCH_MIGHT_HAVE_PC_PARPORT
144 select ARCH_MIGHT_HAVE_PC_SERIO
145 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
146 select ARCH_SUPPORTS_ATOMIC_RMW
147 select ARCH_USE_BUILTIN_BSWAP
148 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
149 select ARCH_WANT_IPC_PARSE_VERSION
150 select ARCH_WEAK_RELEASE_ACQUIRE
152 select BUILDTIME_EXTABLE_SORT
153 select CLONE_BACKWARDS
154 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
155 select DYNAMIC_FTRACE if FUNCTION_TRACER
156 select EDAC_ATOMIC_SCRUB
158 select GENERIC_ATOMIC64 if PPC32
159 select GENERIC_CLOCKEVENTS
160 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
161 select GENERIC_CMOS_UPDATE
162 select GENERIC_CPU_AUTOPROBE
163 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
164 select GENERIC_IRQ_SHOW
165 select GENERIC_IRQ_SHOW_LEVEL
166 select GENERIC_PCI_IOMAP if PCI
167 select GENERIC_SMP_IDLE_THREAD
168 select GENERIC_STRNCPY_FROM_USER
169 select GENERIC_STRNLEN_USER
170 select GENERIC_TIME_VSYSCALL
171 select HAVE_ARCH_AUDITSYSCALL
172 select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
173 select HAVE_ARCH_JUMP_LABEL
174 select HAVE_ARCH_KASAN if PPC32
175 select HAVE_ARCH_KGDB
176 select HAVE_ARCH_MMAP_RND_BITS
177 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
178 select HAVE_ARCH_NVRAM_OPS
179 select HAVE_ARCH_SECCOMP_FILTER
180 select HAVE_ARCH_TRACEHOOK
181 select HAVE_ASM_MODVERSIONS
182 select HAVE_C_RECORDMCOUNT
183 select HAVE_CBPF_JIT if !PPC64
184 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
185 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
186 select HAVE_CONTEXT_TRACKING if PPC64
187 select HAVE_COPY_THREAD_TLS
188 select HAVE_DEBUG_KMEMLEAK
189 select HAVE_DEBUG_STACKOVERFLOW
190 select HAVE_DYNAMIC_FTRACE
191 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
192 select HAVE_EBPF_JIT if PPC64
193 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
195 select HAVE_FTRACE_MCOUNT_RECORD
196 select HAVE_FUNCTION_ERROR_INJECTION
197 select HAVE_FUNCTION_GRAPH_TRACER
198 select HAVE_FUNCTION_TRACER
199 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
200 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
202 select HAVE_IOREMAP_PROT
203 select HAVE_IRQ_EXIT_ON_IRQ_STACK
204 select HAVE_KERNEL_GZIP
205 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
206 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
207 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
209 select HAVE_KPROBES_ON_FTRACE
210 select HAVE_KRETPROBES
211 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
212 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
213 select HAVE_MEMBLOCK_NODE_MAP
214 select HAVE_MOD_ARCH_SPECIFIC
215 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
216 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
218 select HAVE_OPTPROBES if PPC64
219 select HAVE_PERF_EVENTS
220 select HAVE_PERF_EVENTS_NMI if PPC64
221 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
222 select HAVE_PERF_REGS
223 select HAVE_PERF_USER_STACK_DUMP
224 select HAVE_RCU_TABLE_FREE if SMP
225 select HAVE_RCU_TABLE_NO_INVALIDATE if HAVE_RCU_TABLE_FREE
226 select HAVE_MMU_GATHER_PAGE_SIZE
227 select HAVE_REGS_AND_STACK_ACCESS_API
228 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
229 select HAVE_SYSCALL_TRACEPOINTS
230 select HAVE_VIRT_CPU_ACCOUNTING
231 select HAVE_IRQ_TIME_ACCOUNTING
233 select IOMMU_HELPER if PPC64
235 select IRQ_FORCED_THREADING
236 select MODULES_USE_ELF_RELA
237 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
238 select NEED_SG_DMA_LENGTH
240 select OF_EARLY_FLATTREE
241 select OLD_SIGACTION if PPC32
242 select OLD_SIGSUSPEND
243 select PCI_DOMAINS if PCI
244 select PCI_SYSCALL if PCI
245 select PPC_DAWR if PPC64
248 select SYSCTL_EXCEPTION_TRACE
249 select THREAD_INFO_IN_TASK
250 select VIRT_TO_BUS if !PPC64
252 # Please keep this list sorted alphabetically.
255 config PPC_BARRIER_NOSPEC
258 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
271 select COMPAT_BINFMT_ELF
272 select ARCH_WANT_OLD_COMPAT_IPC
273 select COMPAT_OLD_SIGACTION
275 config SYSVIPC_COMPAT
277 depends on COMPAT && SYSVIPC
280 config SCHED_OMIT_FRAME_POINTER
284 config ARCH_MAY_HAVE_PC_FDC
288 config PPC_UDBG_16550
291 config GENERIC_TBSYNC
293 default y if PPC32 && SMP
304 config SYS_SUPPORTS_APM_EMULATION
305 default y if PMAC_APM_EMU
311 Used to allow a board to specify it wants an ePAPR compliant wrapper.
313 config DEFAULT_UIMAGE
316 Used to allow a board to specify it wants a uImage built by default
318 config ARCH_HIBERNATION_POSSIBLE
322 config ARCH_SUSPEND_POSSIBLE
324 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
325 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
328 config ARCH_SUSPEND_NONZERO_CPU
330 depends on PPC_POWERNV || PPC_PSERIES
332 config PPC_DCR_NATIVE
340 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
343 config PPC_OF_PLATFORM_PCI
346 depends on PPC64 # not supported on 32 bits yet
348 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
349 depends on PPC32 || PPC_BOOK3S_64
352 config ARCH_SUPPORTS_UPROBES
355 config PPC_ADV_DEBUG_REGS
357 depends on 40x || BOOKE
360 config PPC_ADV_DEBUG_IACS
362 depends on PPC_ADV_DEBUG_REGS
366 config PPC_ADV_DEBUG_DACS
368 depends on PPC_ADV_DEBUG_REGS
371 config PPC_ADV_DEBUG_DVCS
373 depends on PPC_ADV_DEBUG_REGS
377 config PPC_ADV_DEBUG_DAC_RANGE
379 depends on PPC_ADV_DEBUG_REGS && 44x
387 default y if PPC_BOOK3E_64
389 config PGTABLE_LEVELS
394 source "arch/powerpc/sysdev/Kconfig"
395 source "arch/powerpc/platforms/Kconfig"
397 menu "Kernel options"
400 bool "High memory support"
403 source "kernel/Kconfig.hz"
405 config HUGETLB_PAGE_SIZE_VARIABLE
407 depends on HUGETLB_PAGE && PPC_BOOK3S_64
410 config MATH_EMULATION
411 bool "Math emulation"
412 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
414 Some PowerPC chips designed for embedded applications do not have
415 a floating-point unit and therefore do not implement the
416 floating-point instructions in the PowerPC instruction set. If you
417 say Y here, the kernel will include code to emulate a floating-point
418 unit, which will allow programs that use floating-point
421 This is also useful to emulate missing (optional) instructions
422 such as fsqrt on cores that do have an FPU but do not implement
423 them (such as Freescale BookE).
426 prompt "Math emulation options"
427 default MATH_EMULATION_FULL
428 depends on MATH_EMULATION
430 config MATH_EMULATION_FULL
431 bool "Emulate all the floating point instructions"
433 Select this option will enable the kernel to support to emulate
434 all the floating point instructions. If your SoC doesn't have
435 a FPU, you should select this.
437 config MATH_EMULATION_HW_UNIMPLEMENTED
438 bool "Just emulate the FPU unimplemented instructions"
440 Select this if you know there does have a hardware FPU on your
441 SoC, but some floating point instructions are not implemented by that.
445 config PPC_TRANSACTIONAL_MEM
446 bool "Transactional Memory support for POWERPC"
447 depends on PPC_BOOK3S_64
452 Support user-mode Transactional Memory on POWERPC.
454 config LD_HEAD_STUB_CATCH
455 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
458 Very large kernels can cause linker branch stubs to be generated by
459 code in head_64.S, which moves the head text sections out of their
460 specified location. This option can work around the problem.
464 config MPROFILE_KERNEL
465 depends on PPC64 && CPU_LITTLE_ENDIAN
466 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
469 bool "Support for enabling/disabling CPUs"
470 depends on SMP && (PPC_PSERIES || \
471 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
473 Say Y here to be able to disable and re-enable individual
474 CPUs at runtime on SMP machines.
476 Say N if you are unsure.
478 config ARCH_CPU_PROBE_RELEASE
480 depends on HOTPLUG_CPU
482 config ARCH_ENABLE_MEMORY_HOTPLUG
485 config ARCH_ENABLE_MEMORY_HOTREMOVE
488 config PPC64_SUPPORTS_MEMORY_FAILURE
489 bool "Add support for memory hwpoison"
490 depends on PPC_BOOK3S_64
491 default "y" if PPC_POWERNV
492 select ARCH_SUPPORTS_MEMORY_FAILURE
495 bool "kexec system call"
496 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
499 kexec is a system call that implements the ability to shutdown your
500 current kernel, and to start another kernel. It is like a reboot
501 but it is independent of the system firmware. And like a reboot
502 you can start any kernel with it, not just Linux.
504 The name comes from the similarity to the exec system call.
506 It is an ongoing process to be certain the hardware in a machine
507 is properly shutdown, so do not be surprised if this code does not
508 initially work for you. As of this writing the exact hardware
509 interface is strongly in flux, so no good recommendation can be
513 bool "kexec file based system call"
515 select HAVE_IMA_KEXEC
520 depends on CRYPTO_SHA256=y
522 This is a new version of the kexec system call. This call is
523 file based and takes in file descriptors as system call arguments
524 for kernel and initramfs as opposed to a list of segments as is the
525 case for the older kexec call.
527 config ARCH_HAS_KEXEC_PURGATORY
531 bool "Build a relocatable kernel"
532 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
533 select NONSTATIC_KERNEL
534 select MODULE_REL_CRCS if MODVERSIONS
536 This builds a kernel image that is capable of running at the
537 location the kernel is loaded at. For ppc32, there is no any
538 alignment restrictions, and this feature is a superset of
539 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
540 16k-aligned base address. The kernel is linked as a
541 position-independent executable (PIE) and contains dynamic relocations
542 which are processed early in the bootup process.
544 One use is for the kexec on panic case where the recovery kernel
545 must live at a different physical address than the primary
548 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
549 it has been loaded at and the compile time physical addresses
550 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
551 setting can still be useful to bootwrappers that need to know the
552 load address of the kernel (eg. u-boot/mkimage).
554 config RELOCATABLE_TEST
555 bool "Test relocatable kernel"
556 depends on (PPC64 && RELOCATABLE)
558 This runs the relocatable kernel at the address it was initially
559 loaded at, which tends to be non-zero and therefore test the
563 bool "Build a dump capture kernel"
564 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
565 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
567 Build a kernel suitable for use as a dump capture kernel.
568 The same kernel binary can be used as production kernel and dump
572 bool "Firmware-assisted dump"
573 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
577 A robust mechanism to get reliable kernel crash dump with
578 assistance from firmware. This approach does not use kexec,
579 instead firmware assists in booting the capture kernel
580 while preserving memory contents. Firmware-assisted dump
581 is meant to be a kdump replacement offering robustness and
582 speed not possible without system firmware assistance.
584 If unsure, say "y". Only special kernels like petitboot may
585 need to say "N" here.
587 config PRESERVE_FA_DUMP
588 bool "Preserve Firmware-assisted dump"
589 depends on PPC64 && PPC_POWERNV && !FA_DUMP
591 On a kernel with FA_DUMP disabled, this option helps to preserve
592 crash data from a previously crash'ed kernel. Useful when the next
593 memory preserving kernel boot would process this crash data.
594 Petitboot kernel is the typical usecase for this option.
597 bool "Export OPAL memory as /sys/firmware/opal/core"
598 depends on PPC64 && PPC_POWERNV
600 This option uses the MPIPL support in firmware to provide an
601 ELF core of OPAL memory after a crash. The ELF core is exported
602 as /sys/firmware/opal/core file which is helpful in debugging
603 OPAL crashes using GDB.
606 bool "Distribute interrupts on all CPUs by default"
609 This option gives the kernel permission to distribute IRQs across
610 multiple CPUs. Saying N here will route all IRQs to the first
611 CPU. Generally saying Y is safe, although some problems have been
612 reported with SMP Power Macintoshes with this option enabled.
617 default y if SMP && PPC_PSERIES
623 depends on NEED_MULTIPLE_NODES
625 config USE_PERCPU_NUMA_NODE_ID
629 config HAVE_MEMORYLESS_NODES
633 config ARCH_SELECT_MEMORY_MODEL
637 config ARCH_FLATMEM_ENABLE
639 depends on (PPC64 && !NUMA) || PPC32
641 config ARCH_SPARSEMEM_ENABLE
644 select SPARSEMEM_VMEMMAP_ENABLE
646 config ARCH_SPARSEMEM_DEFAULT
648 depends on PPC_BOOK3S_64
650 config SYS_SUPPORTS_HUGETLBFS
653 config ILLEGAL_POINTER_VALUE
655 # This is roughly half way between the top of user space and the bottom
656 # of kernel space, which seems about as good as we can get.
657 default 0x5deadbeef0000000 if PPC64
660 config ARCH_MEMORY_PROBE
662 depends on MEMORY_HOTPLUG
664 # Some NUMA nodes have memory ranges that span
665 # other nodes. Even though a pfn is valid and
666 # between a node's start and end pfns, it may not
667 # reside on that node. See memmap_init_zone()
669 config NODES_SPAN_OTHER_NODES
671 depends on NEED_MULTIPLE_NODES
674 bool "Using standard binutils settings"
678 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
679 Note, that kernel will be able to run only those applications,
680 which had been compiled using binutils later than 2.17.50.0.3 with
681 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
682 the older binutils, you can patch them with a trivial patch, which
683 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
689 Select the kernel logical page size. Increasing the page size
690 will reduce software overhead at each page boundary, allow
691 hardware prefetch mechanisms to be more effective, and allow
692 larger dma transfers increasing IO efficiency and reducing
693 overhead. However the utilization of memory will increase.
694 For example, each cached file will using a multiple of the
695 page size to hold its contents and the difference between the
696 end of file and the end of page is wasted.
698 Some dedicated systems, such as software raid serving with
699 accelerated calculations, have shown significant increases.
701 If you configure a 64 bit kernel for 64k pages but the
702 processor does not support them, then the kernel will simulate
703 them with 4k pages, loading them on demand, but with the
704 reduced software overhead and larger internal fragmentation.
705 For the 32 bit kernel, a large page option will not be offered
706 unless it is supported by the configured processor.
708 If unsure, choose 4K_PAGES.
712 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
716 depends on 44x || PPC_8xx
720 depends on 44x || PPC_BOOK3S_64
721 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
723 config PPC_256K_PAGES
724 bool "256k page size"
725 depends on 44x && !STDBINUTILS
727 Make the page size 256k.
729 As the ELF standard only requires alignment to support page
730 sizes up to 64k, you will need to compile all of your user
731 space applications with a non-standard binutils settings
732 (see the STDBINUTILS description for details).
734 Say N unless you know what you are doing.
738 config PPC_PAGE_SHIFT
740 default 18 if PPC_256K_PAGES
741 default 16 if PPC_64K_PAGES
742 default 14 if PPC_16K_PAGES
746 int "Thread shift" if EXPERT
748 default "15" if PPC_256K_PAGES
749 default "14" if PPC64
752 Used to define the stack size. The default is almost always what you
753 want. Only change this if you know what you are doing.
755 config ETEXT_SHIFT_BOOL
756 bool "Set custom etext alignment" if STRICT_KERNEL_RWX && \
757 (PPC_BOOK3S_32 || PPC_8xx)
758 depends on ADVANCED_OPTIONS
760 This option allows you to set the kernel end of text alignment. When
761 RAM is mapped by blocks, the alignment needs to fit the size and
762 number of possible blocks. The default should be OK for most configs.
764 Say N here unless you know what you are doing.
767 int "_etext shift" if ETEXT_SHIFT_BOOL
768 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
769 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
770 default 17 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
771 default 19 if STRICT_KERNEL_RWX && PPC_8xx
772 default PPC_PAGE_SHIFT
774 On Book3S 32 (603+), IBATs are used to map kernel text.
775 Smaller is the alignment, greater is the number of necessary IBATs.
777 On 8xx, large pages (512kb or 8M) are used to map kernel linear
778 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
781 config DATA_SHIFT_BOOL
782 bool "Set custom data alignment" if STRICT_KERNEL_RWX && \
783 (PPC_BOOK3S_32 || PPC_8xx)
784 depends on ADVANCED_OPTIONS
786 This option allows you to set the kernel data alignment. When
787 RAM is mapped by blocks, the alignment needs to fit the size and
788 number of possible blocks. The default should be OK for most configs.
790 Say N here unless you know what you are doing.
793 int "Data shift" if DATA_SHIFT_BOOL
794 default 24 if STRICT_KERNEL_RWX && PPC64
795 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
796 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
797 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
798 default 23 if STRICT_KERNEL_RWX && PPC_8xx
799 default PPC_PAGE_SHIFT
801 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
802 Smaller is the alignment, greater is the number of necessary DBATs.
804 On 8xx, large pages (512kb or 8M) are used to map kernel linear
805 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
808 config FORCE_MAX_ZONEORDER
809 int "Maximum zone order"
810 range 8 9 if PPC64 && PPC_64K_PAGES
811 default "9" if PPC64 && PPC_64K_PAGES
812 range 13 13 if PPC64 && !PPC_64K_PAGES
813 default "13" if PPC64 && !PPC_64K_PAGES
814 range 9 64 if PPC32 && PPC_16K_PAGES
815 default "9" if PPC32 && PPC_16K_PAGES
816 range 7 64 if PPC32 && PPC_64K_PAGES
817 default "7" if PPC32 && PPC_64K_PAGES
818 range 5 64 if PPC32 && PPC_256K_PAGES
819 default "5" if PPC32 && PPC_256K_PAGES
823 The kernel memory allocator divides physically contiguous memory
824 blocks into "zones", where each zone is a power of two number of
825 pages. This option selects the largest power of two that the kernel
826 keeps in the memory allocator. If you need to allocate very large
827 blocks of physically contiguous memory, then you may need to
830 This config option is actually maximum order plus one. For example,
831 a value of 11 means that the largest free memory block is 2^10 pages.
833 The page size is not necessarily 4KB. For example, on 64-bit
834 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
835 this in mind when choosing a value for this option.
837 config PPC_SUBPAGE_PROT
838 bool "Support setting protections for 4k subpages"
839 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
841 This option adds support for a system call to allow user programs
842 to set access permissions (read/write, readonly, or no access)
843 on the 4k subpages of each 64k page.
845 config PPC_COPRO_BASE
849 bool "SMT (Hyperthreading) scheduler support"
850 depends on PPC64 && SMP
852 SMT scheduler support improves the CPU scheduler's decision making
853 when dealing with POWER5 cpus at a cost of slightly increased
854 overhead in some places. If unsure say N here.
856 config PPC_DENORMALISATION
857 bool "PowerPC denormalisation exception handling"
858 depends on PPC_BOOK3S_64
859 default "y" if PPC_POWERNV
861 Add support for handling denormalisation of single precision
862 values. Useful for bare metal only. If unsure say Y here.
865 bool "Default bootloader kernel arguments"
868 string "Initial kernel command string" if CMDLINE_BOOL
869 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" if CMDLINE_BOOL
872 On some platforms, there is currently no way for the boot loader to
873 pass arguments to the kernel. For these platforms, you can supply
874 some command-line options at build time by entering them here. In
875 most cases you will need to specify the root device here.
878 bool "Always use the default kernel command string"
879 depends on CMDLINE_BOOL
881 Always use the default kernel command string, even if the boot
882 loader passes other arguments to the kernel.
883 This is useful if you cannot or don't want to change the
884 command-line options your boot loader passes to the kernel.
887 string "Additional default image types"
889 List additional targets to be built by the bootwrapper here (separated
890 by spaces). This is useful for targets that depend of device tree
891 files in the .dts directory.
893 Targets in this list will be build as part of the default build
894 target, or when the user does a 'make zImage' or a
895 'make zImage.initrd'.
897 If unsure, leave blank
899 config ARCH_WANTS_FREEZER_CONTROL
903 source "kernel/power/Kconfig"
906 bool "Enable seccomp to safely compute untrusted bytecode"
910 This kernel feature is useful for number crunching applications
911 that may need to compute untrusted bytecode during their
912 execution. By using pipes or other transports made available to
913 the process as file descriptors supporting the read/write
914 syscalls, it's possible to isolate those applications in
915 their own address space using seccomp. Once seccomp is
916 enabled via /proc/<pid>/seccomp, it cannot be disabled
917 and the task is only allowed to execute a few safe syscalls
918 defined by each seccomp mode.
920 If unsure, say Y. Only embedded should say N here.
923 prompt "PowerPC Memory Protection Keys"
925 depends on PPC_BOOK3S_64
926 select ARCH_USES_HIGH_VMA_FLAGS
927 select ARCH_HAS_PKEYS
929 Memory Protection Keys provides a mechanism for enforcing
930 page-based protections, but without requiring modification of the
931 page tables when an application changes protection domains.
933 For details, see Documentation/core-api/protection-keys.rst
946 bool "Support for ISA-bus hardware"
950 Find out whether you have ISA slots on your motherboard. ISA is the
951 name of a bus system, i.e. the way the CPU talks to the other stuff
952 inside your box. If you have an Apple machine, say N here; if you
953 have an IBM RS/6000 or pSeries machine, say Y. If you have an
954 embedded board, consult your board documentation.
956 config GENERIC_ISA_DMA
958 depends on ISA_DMA_API
961 config PPC_INDIRECT_PCI
964 default y if 40x || 44x
974 select ARCH_HAS_DMA_SET_MASK
975 select PPC_INDIRECT_PCI
981 depends on SUSPEND && (PPC_85xx || PPC_86xx)
983 Freescale MPC85xx/MPC86xx power management controller support
984 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
989 depends on SUSPEND && (44x || 40x)
991 PPC4xx Clock Power Management (CPM) support (suspend/resume).
992 It also enables support for two different idle states (idle-wait
999 bool "Freescale Local Bus support"
1001 Enables reporting of errors from the Freescale local bus
1002 controller. Also contains some common code used by
1003 drivers for specific local bus peripherals.
1007 depends on PPC_83xx || QUICC_ENGINE || CPM2
1009 Freescale General-purpose Timers support
1013 depends on PCI && 8260
1014 select PPC_INDIRECT_PCI
1018 bool "Freescale Embedded SRIO Controller support"
1019 depends on RAPIDIO = y && HAVE_RAPIDIO
1022 Include support for RapidIO controller on Freescale embedded
1023 processors (MPC8548, MPC8641, etc).
1027 config NONSTATIC_KERNEL
1030 menu "Advanced setup"
1033 config ADVANCED_OPTIONS
1034 bool "Prompt for advanced kernel configuration options"
1036 This option will enable prompting for a variety of advanced kernel
1037 configuration options. These options can cause the kernel to not
1038 work if they are set incorrectly, but can be used to optimize certain
1039 aspects of kernel memory management.
1041 Unless you know what you are doing, say N here.
1043 comment "Default settings for advanced configuration options are used"
1044 depends on !ADVANCED_OPTIONS
1046 config LOWMEM_SIZE_BOOL
1047 bool "Set maximum low memory"
1048 depends on ADVANCED_OPTIONS
1050 This option allows you to set the maximum amount of memory which
1051 will be used as "low memory", that is, memory which the kernel can
1052 access directly, without having to set up a kernel virtual mapping.
1053 This can be useful in optimizing the layout of kernel virtual
1056 Say N here unless you know what you are doing.
1059 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1060 default "0x30000000"
1062 config LOWMEM_CAM_NUM_BOOL
1063 bool "Set number of CAMs to use to map low memory"
1064 depends on ADVANCED_OPTIONS && FSL_BOOKE
1066 This option allows you to set the maximum number of CAM slots that
1067 will be used to map low memory. There are a limited number of slots
1068 available and even more limited number that will fit in the L1 MMU.
1069 However, using more entries will allow mapping more low memory. This
1070 can be useful in optimizing the layout of kernel virtual memory.
1072 Say N here unless you know what you are doing.
1074 config LOWMEM_CAM_NUM
1075 depends on FSL_BOOKE
1076 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1079 config DYNAMIC_MEMSTART
1080 bool "Enable page aligned dynamic load address for kernel"
1081 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1082 select NONSTATIC_KERNEL
1084 This option enables the kernel to be loaded at any page aligned
1085 physical address. The kernel creates a mapping from KERNELBASE to
1086 the address where the kernel is loaded. The page size here implies
1087 the TLB page size of the mapping for kernel on the particular platform.
1088 Please refer to the init code for finding the TLB page size.
1090 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1091 kernel image, where the only restriction is the page aligned kernel
1092 load address. When this option is enabled, the compile time physical
1093 address CONFIG_PHYSICAL_START is ignored.
1095 This option is overridden by CONFIG_RELOCATABLE
1097 config PAGE_OFFSET_BOOL
1098 bool "Set custom page offset address"
1099 depends on ADVANCED_OPTIONS
1101 This option allows you to set the kernel virtual address at which
1102 the kernel will map low memory. This can be useful in optimizing
1103 the virtual memory layout of the system.
1105 Say N here unless you know what you are doing.
1108 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1109 default "0xc0000000"
1111 config KERNEL_START_BOOL
1112 bool "Set custom kernel base address"
1113 depends on ADVANCED_OPTIONS
1115 This option allows you to set the kernel virtual address at which
1116 the kernel will be loaded. Normally this should match PAGE_OFFSET
1117 however there are times (like kdump) that one might not want them
1120 Say N here unless you know what you are doing.
1123 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1124 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1125 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1126 default "0xc0000000"
1128 config PHYSICAL_START_BOOL
1129 bool "Set physical address where the kernel is loaded"
1130 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1132 This gives the physical address where the kernel is loaded.
1134 Say N here unless you know what you are doing.
1136 config PHYSICAL_START
1137 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1138 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1139 default "0x00000000"
1141 config PHYSICAL_ALIGN
1143 default "0x04000000" if FSL_BOOKE
1145 This value puts the alignment restrictions on physical address
1146 where kernel is loaded and run from. Kernel is compiled for an
1147 address which meets above alignment restriction.
1149 config TASK_SIZE_BOOL
1150 bool "Set custom user task size"
1151 depends on ADVANCED_OPTIONS
1153 This option allows you to set the amount of virtual address space
1154 allocated to user tasks. This can be useful in optimizing the
1155 virtual memory layout of the system.
1157 Say N here unless you know what you are doing.
1160 hex "Size of user task space" if TASK_SIZE_BOOL
1161 default "0x80000000" if PPC_8xx
1162 default "0xc0000000"
1165 bool "Pinned Kernel TLBs (860 ONLY)"
1166 depends on ADVANCED_OPTIONS && PPC_8xx && \
1167 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1170 bool "Pinned TLB for DATA"
1175 bool "Pinned TLB for IMMR"
1176 depends on PIN_TLB || PPC_EARLY_DEBUG_CPM
1180 bool "Pinned TLB for TEXT"
1186 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1189 default "0xc000000000000000"
1192 default "0xc000000000000000"
1193 config PHYSICAL_START
1195 default "0x00000000"
1201 config PPC_LIB_RHEAP
1204 source "arch/powerpc/kvm/Kconfig"
1206 source "kernel/livepatch/Kconfig"