1 # SPDX-License-Identifier: GPL-2.0
2 source "arch/powerpc/platforms/Kconfig.cputype"
16 config ARCH_MMAP_RND_BITS_MAX
17 # On Book3S 64, the default virtual address space for 64-bit processes
18 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
19 # 32T of address space (2^45), which should ensure a reasonable gap
20 # between bottom-up and top-down allocations for applications that
21 # consume "normal" amounts of address space. Book3S 64 only supports 64K
23 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
24 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K)
26 # On all other 64-bit platforms (currently only Book3E), the virtual
27 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
28 # of address space (2^44). Only 4K page sizes are supported.
29 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K)
31 # For 32-bit, use the compat values, as they're the same.
32 default ARCH_MMAP_RND_COMPAT_BITS_MAX
34 config ARCH_MMAP_RND_BITS_MIN
35 # Allow randomisation to consume up to 1GB of address space (2^30).
36 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K)
37 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K)
39 # For 32-bit, use the compat values, as they're the same.
40 default ARCH_MMAP_RND_COMPAT_BITS_MIN
42 config ARCH_MMAP_RND_COMPAT_BITS_MAX
43 # Total virtual address space for 32-bit processes is 2^31 (2GB).
44 # Allow randomisation to consume up to 512MB of address space (2^29).
45 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K)
46 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K)
47 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K)
48 default 17 # 17 = 29 (512MB) - 12 (4K)
50 config ARCH_MMAP_RND_COMPAT_BITS_MIN
51 # Total virtual address space for 32-bit processes is 2^31 (2GB).
52 # Allow randomisation to consume up to 8MB of address space (2^23).
53 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K)
54 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K)
55 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K)
56 default 11 # 11 = 23 (8MB) - 12 (4K)
58 config HAVE_SETUP_PER_CPU_AREA
61 config NEED_PER_CPU_EMBED_FIRST_CHUNK
65 int "Number of virtual interrupt numbers"
69 This defines the number of virtual interrupt numbers the kernel
70 can manage. Virtual interrupt numbers are what you see in
71 /proc/interrupts. If you configure your system to have too few,
72 drivers will fail to load or worse - handle with care.
76 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
81 depends on HARDLOCKUP_DETECTOR
82 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
85 This is a placeholder when the powerpc hardlockup detector
86 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
87 seleted via the generic lockup detector menu which is why we
88 have no standalone config option for it here.
90 config STACKTRACE_SUPPORT
94 config TRACE_IRQFLAGS_SUPPORT
98 config LOCKDEP_SUPPORT
102 config GENERIC_LOCKBREAK
105 depends on SMP && PREEMPTION
107 config GENERIC_HWEIGHT
115 # Please keep this list sorted alphabetically.
117 select ARCH_32BIT_OFF_T if PPC32
118 select ARCH_HAS_DEBUG_VIRTUAL
119 select ARCH_HAS_DEVMEM_IS_ALLOWED
120 select ARCH_HAS_ELF_RANDOMIZE
121 select ARCH_HAS_FORTIFY_SOURCE
122 select ARCH_HAS_GCOV_PROFILE_ALL
124 select ARCH_HAS_HUGEPD if HUGETLB_PAGE
125 select ARCH_HAS_MMIOWB if PPC64
126 select ARCH_HAS_PHYS_TO_DMA
127 select ARCH_HAS_PMEM_API
128 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
129 select ARCH_HAS_PTE_SPECIAL
130 select ARCH_HAS_MEMBARRIER_CALLBACKS
131 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
132 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !HIBERNATION)
133 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
134 select ARCH_HAS_UACCESS_FLUSHCACHE
135 select ARCH_HAS_UACCESS_MCSAFE if PPC64
136 select ARCH_HAS_UBSAN_SANITIZE_ALL
137 select ARCH_HAVE_NMI_SAFE_CMPXCHG
138 select ARCH_KEEP_MEMBLOCK
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_TABLE_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_EARLY_IOREMAP
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_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
170 select HAVE_ARCH_JUMP_LABEL
171 select HAVE_ARCH_KASAN if PPC32
172 select HAVE_ARCH_KASAN_VMALLOC if PPC32
173 select HAVE_ARCH_KGDB
174 select HAVE_ARCH_MMAP_RND_BITS
175 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
176 select HAVE_ARCH_NVRAM_OPS
177 select HAVE_ARCH_SECCOMP_FILTER
178 select HAVE_ARCH_TRACEHOOK
179 select HAVE_ASM_MODVERSIONS
180 select HAVE_C_RECORDMCOUNT
181 select HAVE_CBPF_JIT if !PPC64
182 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
183 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
184 select HAVE_CONTEXT_TRACKING if PPC64
185 select HAVE_TIF_NOHZ if PPC64
186 select HAVE_COPY_THREAD_TLS
187 select HAVE_DEBUG_KMEMLEAK
188 select HAVE_DEBUG_STACKOVERFLOW
189 select HAVE_DYNAMIC_FTRACE
190 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
191 select HAVE_EBPF_JIT if PPC64
192 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
194 select HAVE_FTRACE_MCOUNT_RECORD
195 select HAVE_FUNCTION_ERROR_INJECTION
196 select HAVE_FUNCTION_GRAPH_TRACER
197 select HAVE_FUNCTION_TRACER
198 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
199 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
201 select HAVE_IOREMAP_PROT
202 select HAVE_IRQ_EXIT_ON_IRQ_STACK
203 select HAVE_KERNEL_GZIP
204 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
205 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
206 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
208 select HAVE_KPROBES_ON_FTRACE
209 select HAVE_KRETPROBES
210 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
211 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
212 select HAVE_MEMBLOCK_NODE_MAP
213 select HAVE_MOD_ARCH_SPECIFIC
214 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
215 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
217 select HAVE_OPTPROBES if PPC64
218 select HAVE_PERF_EVENTS
219 select HAVE_PERF_EVENTS_NMI if PPC64
220 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
221 select HAVE_PERF_REGS
222 select HAVE_PERF_USER_STACK_DUMP
223 select MMU_GATHER_RCU_TABLE_FREE
224 select MMU_GATHER_PAGE_SIZE
225 select HAVE_REGS_AND_STACK_ACCESS_API
226 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
227 select HAVE_SYSCALL_TRACEPOINTS
228 select HAVE_VIRT_CPU_ACCOUNTING
229 select HAVE_IRQ_TIME_ACCOUNTING
231 select IOMMU_HELPER if PPC64
233 select IRQ_FORCED_THREADING
234 select MODULES_USE_ELF_RELA
235 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
236 select NEED_SG_DMA_LENGTH
238 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
239 select OF_EARLY_FLATTREE
240 select OLD_SIGACTION if PPC32
241 select OLD_SIGSUSPEND
242 select PCI_DOMAINS if PCI
243 select PCI_SYSCALL if PCI
244 select PPC_DAWR if PPC64
247 select SYSCTL_EXCEPTION_TRACE
248 select THREAD_INFO_IN_TASK
249 select VIRT_TO_BUS if !PPC64
251 # Please keep this list sorted alphabetically.
254 config PPC_BARRIER_NOSPEC
257 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
270 select COMPAT_BINFMT_ELF
271 select ARCH_WANT_OLD_COMPAT_IPC
272 select COMPAT_OLD_SIGACTION
274 config SYSVIPC_COMPAT
276 depends on COMPAT && SYSVIPC
279 config SCHED_OMIT_FRAME_POINTER
283 config ARCH_MAY_HAVE_PC_FDC
287 config PPC_UDBG_16550
290 config GENERIC_TBSYNC
292 default y if PPC32 && SMP
303 config SYS_SUPPORTS_APM_EMULATION
304 default y if PMAC_APM_EMU
310 Used to allow a board to specify it wants an ePAPR compliant wrapper.
312 config DEFAULT_UIMAGE
315 Used to allow a board to specify it wants a uImage built by default
317 config ARCH_HIBERNATION_POSSIBLE
321 config ARCH_SUSPEND_POSSIBLE
323 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
324 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
327 config ARCH_SUSPEND_NONZERO_CPU
329 depends on PPC_POWERNV || PPC_PSERIES
331 config PPC_DCR_NATIVE
339 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
342 config PPC_OF_PLATFORM_PCI
345 depends on PPC64 # not supported on 32 bits yet
347 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
348 depends on PPC32 || PPC_BOOK3S_64
351 config ARCH_SUPPORTS_UPROBES
354 config PPC_ADV_DEBUG_REGS
356 depends on 40x || BOOKE
359 config PPC_ADV_DEBUG_IACS
361 depends on PPC_ADV_DEBUG_REGS
365 config PPC_ADV_DEBUG_DACS
367 depends on PPC_ADV_DEBUG_REGS
370 config PPC_ADV_DEBUG_DVCS
372 depends on PPC_ADV_DEBUG_REGS
376 config PPC_ADV_DEBUG_DAC_RANGE
378 depends on PPC_ADV_DEBUG_REGS && 44x
386 default y if PPC_BOOK3E_64
388 config PGTABLE_LEVELS
393 source "arch/powerpc/sysdev/Kconfig"
394 source "arch/powerpc/platforms/Kconfig"
396 menu "Kernel options"
399 bool "High memory support"
402 source "kernel/Kconfig.hz"
404 config HUGETLB_PAGE_SIZE_VARIABLE
406 depends on HUGETLB_PAGE && PPC_BOOK3S_64
409 config MATH_EMULATION
410 bool "Math emulation"
411 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
413 Some PowerPC chips designed for embedded applications do not have
414 a floating-point unit and therefore do not implement the
415 floating-point instructions in the PowerPC instruction set. If you
416 say Y here, the kernel will include code to emulate a floating-point
417 unit, which will allow programs that use floating-point
420 This is also useful to emulate missing (optional) instructions
421 such as fsqrt on cores that do have an FPU but do not implement
422 them (such as Freescale BookE).
425 prompt "Math emulation options"
426 default MATH_EMULATION_FULL
427 depends on MATH_EMULATION
429 config MATH_EMULATION_FULL
430 bool "Emulate all the floating point instructions"
432 Select this option will enable the kernel to support to emulate
433 all the floating point instructions. If your SoC doesn't have
434 a FPU, you should select this.
436 config MATH_EMULATION_HW_UNIMPLEMENTED
437 bool "Just emulate the FPU unimplemented instructions"
439 Select this if you know there does have a hardware FPU on your
440 SoC, but some floating point instructions are not implemented by that.
444 config PPC_TRANSACTIONAL_MEM
445 bool "Transactional Memory support for POWERPC"
446 depends on PPC_BOOK3S_64
451 Support user-mode Transactional Memory on POWERPC.
454 bool "Ultravisor support"
455 depends on KVM_BOOK3S_HV_POSSIBLE
456 depends on DEVICE_PRIVATE
459 This option paravirtualizes the kernel to run in POWER platforms that
460 supports the Protected Execution Facility (PEF). On such platforms,
461 the ultravisor firmware runs at a privilege level above the
466 config LD_HEAD_STUB_CATCH
467 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
470 Very large kernels can cause linker branch stubs to be generated by
471 code in head_64.S, which moves the head text sections out of their
472 specified location. This option can work around the problem.
476 config MPROFILE_KERNEL
477 depends on PPC64 && CPU_LITTLE_ENDIAN
478 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
481 bool "Support for enabling/disabling CPUs"
482 depends on SMP && (PPC_PSERIES || \
483 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
485 Say Y here to be able to disable and re-enable individual
486 CPUs at runtime on SMP machines.
488 Say N if you are unsure.
490 config ARCH_CPU_PROBE_RELEASE
492 depends on HOTPLUG_CPU
494 config ARCH_ENABLE_MEMORY_HOTPLUG
497 config ARCH_ENABLE_MEMORY_HOTREMOVE
500 config PPC64_SUPPORTS_MEMORY_FAILURE
501 bool "Add support for memory hwpoison"
502 depends on PPC_BOOK3S_64
503 default "y" if PPC_POWERNV
504 select ARCH_SUPPORTS_MEMORY_FAILURE
507 bool "kexec system call"
508 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
511 kexec is a system call that implements the ability to shutdown your
512 current kernel, and to start another kernel. It is like a reboot
513 but it is independent of the system firmware. And like a reboot
514 you can start any kernel with it, not just Linux.
516 The name comes from the similarity to the exec system call.
518 It is an ongoing process to be certain the hardware in a machine
519 is properly shutdown, so do not be surprised if this code does not
520 initially work for you. As of this writing the exact hardware
521 interface is strongly in flux, so no good recommendation can be
525 bool "kexec file based system call"
527 select HAVE_IMA_KEXEC
532 depends on CRYPTO_SHA256=y
534 This is a new version of the kexec system call. This call is
535 file based and takes in file descriptors as system call arguments
536 for kernel and initramfs as opposed to a list of segments as is the
537 case for the older kexec call.
539 config ARCH_HAS_KEXEC_PURGATORY
543 bool "Build a relocatable kernel"
544 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
545 select NONSTATIC_KERNEL
546 select MODULE_REL_CRCS if MODVERSIONS
548 This builds a kernel image that is capable of running at the
549 location the kernel is loaded at. For ppc32, there is no any
550 alignment restrictions, and this feature is a superset of
551 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
552 16k-aligned base address. The kernel is linked as a
553 position-independent executable (PIE) and contains dynamic relocations
554 which are processed early in the bootup process.
556 One use is for the kexec on panic case where the recovery kernel
557 must live at a different physical address than the primary
560 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
561 it has been loaded at and the compile time physical addresses
562 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
563 setting can still be useful to bootwrappers that need to know the
564 load address of the kernel (eg. u-boot/mkimage).
566 config RANDOMIZE_BASE
567 bool "Randomize the address of the kernel image"
568 depends on (FSL_BOOKE && FLATMEM && PPC32)
569 depends on RELOCATABLE
571 Randomizes the virtual address at which the kernel image is
572 loaded, as a security feature that deters exploit attempts
573 relying on knowledge of the location of kernel internals.
577 config RELOCATABLE_TEST
578 bool "Test relocatable kernel"
579 depends on (PPC64 && RELOCATABLE)
581 This runs the relocatable kernel at the address it was initially
582 loaded at, which tends to be non-zero and therefore test the
586 bool "Build a dump capture kernel"
587 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
588 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
590 Build a kernel suitable for use as a dump capture kernel.
591 The same kernel binary can be used as production kernel and dump
595 bool "Firmware-assisted dump"
596 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
600 A robust mechanism to get reliable kernel crash dump with
601 assistance from firmware. This approach does not use kexec,
602 instead firmware assists in booting the capture kernel
603 while preserving memory contents. Firmware-assisted dump
604 is meant to be a kdump replacement offering robustness and
605 speed not possible without system firmware assistance.
607 If unsure, say "y". Only special kernels like petitboot may
608 need to say "N" here.
610 config PRESERVE_FA_DUMP
611 bool "Preserve Firmware-assisted dump"
612 depends on PPC64 && PPC_POWERNV && !FA_DUMP
614 On a kernel with FA_DUMP disabled, this option helps to preserve
615 crash data from a previously crash'ed kernel. Useful when the next
616 memory preserving kernel boot would process this crash data.
617 Petitboot kernel is the typical usecase for this option.
620 bool "Export OPAL memory as /sys/firmware/opal/core"
621 depends on PPC64 && PPC_POWERNV
623 This option uses the MPIPL support in firmware to provide an
624 ELF core of OPAL memory after a crash. The ELF core is exported
625 as /sys/firmware/opal/core file which is helpful in debugging
626 OPAL crashes using GDB.
629 bool "Distribute interrupts on all CPUs by default"
632 This option gives the kernel permission to distribute IRQs across
633 multiple CPUs. Saying N here will route all IRQs to the first
634 CPU. Generally saying Y is safe, although some problems have been
635 reported with SMP Power Macintoshes with this option enabled.
640 default y if SMP && PPC_PSERIES
646 depends on NEED_MULTIPLE_NODES
648 config USE_PERCPU_NUMA_NODE_ID
652 config HAVE_MEMORYLESS_NODES
656 config ARCH_SELECT_MEMORY_MODEL
660 config ARCH_FLATMEM_ENABLE
662 depends on (PPC64 && !NUMA) || PPC32
664 config ARCH_SPARSEMEM_ENABLE
667 select SPARSEMEM_VMEMMAP_ENABLE
669 config ARCH_SPARSEMEM_DEFAULT
671 depends on PPC_BOOK3S_64
673 config SYS_SUPPORTS_HUGETLBFS
676 config ILLEGAL_POINTER_VALUE
678 # This is roughly half way between the top of user space and the bottom
679 # of kernel space, which seems about as good as we can get.
680 default 0x5deadbeef0000000 if PPC64
683 config ARCH_MEMORY_PROBE
685 depends on MEMORY_HOTPLUG
687 # Some NUMA nodes have memory ranges that span
688 # other nodes. Even though a pfn is valid and
689 # between a node's start and end pfns, it may not
690 # reside on that node. See memmap_init_zone()
692 config NODES_SPAN_OTHER_NODES
694 depends on NEED_MULTIPLE_NODES
697 bool "Using standard binutils settings"
701 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
702 Note, that kernel will be able to run only those applications,
703 which had been compiled using binutils later than 2.17.50.0.3 with
704 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
705 the older binutils, you can patch them with a trivial patch, which
706 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
712 Select the kernel logical page size. Increasing the page size
713 will reduce software overhead at each page boundary, allow
714 hardware prefetch mechanisms to be more effective, and allow
715 larger dma transfers increasing IO efficiency and reducing
716 overhead. However the utilization of memory will increase.
717 For example, each cached file will using a multiple of the
718 page size to hold its contents and the difference between the
719 end of file and the end of page is wasted.
721 Some dedicated systems, such as software raid serving with
722 accelerated calculations, have shown significant increases.
724 If you configure a 64 bit kernel for 64k pages but the
725 processor does not support them, then the kernel will simulate
726 them with 4k pages, loading them on demand, but with the
727 reduced software overhead and larger internal fragmentation.
728 For the 32 bit kernel, a large page option will not be offered
729 unless it is supported by the configured processor.
731 If unsure, choose 4K_PAGES.
735 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
739 depends on 44x || PPC_8xx
743 depends on 44x || PPC_BOOK3S_64
744 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
746 config PPC_256K_PAGES
747 bool "256k page size"
748 depends on 44x && !STDBINUTILS
750 Make the page size 256k.
752 As the ELF standard only requires alignment to support page
753 sizes up to 64k, you will need to compile all of your user
754 space applications with a non-standard binutils settings
755 (see the STDBINUTILS description for details).
757 Say N unless you know what you are doing.
761 config PPC_PAGE_SHIFT
763 default 18 if PPC_256K_PAGES
764 default 16 if PPC_64K_PAGES
765 default 14 if PPC_16K_PAGES
769 int "Thread shift" if EXPERT
771 default "15" if PPC_256K_PAGES
772 default "14" if PPC64
775 Used to define the stack size. The default is almost always what you
776 want. Only change this if you know what you are doing.
778 config ETEXT_SHIFT_BOOL
779 bool "Set custom etext alignment" if STRICT_KERNEL_RWX && \
780 (PPC_BOOK3S_32 || PPC_8xx)
781 depends on ADVANCED_OPTIONS
783 This option allows you to set the kernel end of text alignment. When
784 RAM is mapped by blocks, the alignment needs to fit the size and
785 number of possible blocks. The default should be OK for most configs.
787 Say N here unless you know what you are doing.
790 int "_etext shift" if ETEXT_SHIFT_BOOL
791 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
792 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
793 default 17 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
794 default 19 if STRICT_KERNEL_RWX && PPC_8xx
795 default PPC_PAGE_SHIFT
797 On Book3S 32 (603+), IBATs are used to map kernel text.
798 Smaller is the alignment, greater is the number of necessary IBATs.
800 On 8xx, large pages (512kb or 8M) are used to map kernel linear
801 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
804 config DATA_SHIFT_BOOL
805 bool "Set custom data alignment" if STRICT_KERNEL_RWX && \
806 (PPC_BOOK3S_32 || PPC_8xx)
807 depends on ADVANCED_OPTIONS
809 This option allows you to set the kernel data alignment. When
810 RAM is mapped by blocks, the alignment needs to fit the size and
811 number of possible blocks. The default should be OK for most configs.
813 Say N here unless you know what you are doing.
816 int "Data shift" if DATA_SHIFT_BOOL
817 default 24 if STRICT_KERNEL_RWX && PPC64
818 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
819 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
820 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
821 default 23 if STRICT_KERNEL_RWX && PPC_8xx
822 default PPC_PAGE_SHIFT
824 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
825 Smaller is the alignment, greater is the number of necessary DBATs.
827 On 8xx, large pages (512kb or 8M) are used to map kernel linear
828 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
831 config FORCE_MAX_ZONEORDER
832 int "Maximum zone order"
833 range 8 9 if PPC64 && PPC_64K_PAGES
834 default "9" if PPC64 && PPC_64K_PAGES
835 range 13 13 if PPC64 && !PPC_64K_PAGES
836 default "13" if PPC64 && !PPC_64K_PAGES
837 range 9 64 if PPC32 && PPC_16K_PAGES
838 default "9" if PPC32 && PPC_16K_PAGES
839 range 7 64 if PPC32 && PPC_64K_PAGES
840 default "7" if PPC32 && PPC_64K_PAGES
841 range 5 64 if PPC32 && PPC_256K_PAGES
842 default "5" if PPC32 && PPC_256K_PAGES
846 The kernel memory allocator divides physically contiguous memory
847 blocks into "zones", where each zone is a power of two number of
848 pages. This option selects the largest power of two that the kernel
849 keeps in the memory allocator. If you need to allocate very large
850 blocks of physically contiguous memory, then you may need to
853 This config option is actually maximum order plus one. For example,
854 a value of 11 means that the largest free memory block is 2^10 pages.
856 The page size is not necessarily 4KB. For example, on 64-bit
857 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
858 this in mind when choosing a value for this option.
860 config PPC_SUBPAGE_PROT
861 bool "Support setting protections for 4k subpages"
862 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
864 This option adds support for a system call to allow user programs
865 to set access permissions (read/write, readonly, or no access)
866 on the 4k subpages of each 64k page.
868 config PPC_COPRO_BASE
872 bool "SMT (Hyperthreading) scheduler support"
873 depends on PPC64 && SMP
875 SMT scheduler support improves the CPU scheduler's decision making
876 when dealing with POWER5 cpus at a cost of slightly increased
877 overhead in some places. If unsure say N here.
879 config PPC_DENORMALISATION
880 bool "PowerPC denormalisation exception handling"
881 depends on PPC_BOOK3S_64
882 default "y" if PPC_POWERNV
884 Add support for handling denormalisation of single precision
885 values. Useful for bare metal only. If unsure say Y here.
888 bool "Default bootloader kernel arguments"
891 string "Initial kernel command string" if CMDLINE_BOOL
892 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" if CMDLINE_BOOL
895 On some platforms, there is currently no way for the boot loader to
896 pass arguments to the kernel. For these platforms, you can supply
897 some command-line options at build time by entering them here. In
898 most cases you will need to specify the root device here.
901 prompt "Kernel command line type" if CMDLINE != ""
902 default CMDLINE_FROM_BOOTLOADER
904 config CMDLINE_FROM_BOOTLOADER
905 bool "Use bootloader kernel arguments if available"
907 Uses the command-line options passed by the boot loader. If
908 the boot loader doesn't provide any, the default kernel command
909 string provided in CMDLINE will be used.
911 config CMDLINE_EXTEND
912 bool "Extend bootloader kernel arguments"
914 The command-line arguments provided by the boot loader will be
915 appended to the default kernel command string.
918 bool "Always use the default kernel command string"
920 Always use the default kernel command string, even if the boot
921 loader passes other arguments to the kernel.
922 This is useful if you cannot or don't want to change the
923 command-line options your boot loader passes to the kernel.
928 string "Additional default image types"
930 List additional targets to be built by the bootwrapper here (separated
931 by spaces). This is useful for targets that depend of device tree
932 files in the .dts directory.
934 Targets in this list will be build as part of the default build
935 target, or when the user does a 'make zImage' or a
936 'make zImage.initrd'.
938 If unsure, leave blank
940 config ARCH_WANTS_FREEZER_CONTROL
944 source "kernel/power/Kconfig"
947 bool "Enable seccomp to safely compute untrusted bytecode"
951 This kernel feature is useful for number crunching applications
952 that may need to compute untrusted bytecode during their
953 execution. By using pipes or other transports made available to
954 the process as file descriptors supporting the read/write
955 syscalls, it's possible to isolate those applications in
956 their own address space using seccomp. Once seccomp is
957 enabled via /proc/<pid>/seccomp, it cannot be disabled
958 and the task is only allowed to execute a few safe syscalls
959 defined by each seccomp mode.
961 If unsure, say Y. Only embedded should say N here.
964 prompt "PowerPC Memory Protection Keys"
966 depends on PPC_BOOK3S_64
967 select ARCH_USES_HIGH_VMA_FLAGS
968 select ARCH_HAS_PKEYS
970 Memory Protection Keys provides a mechanism for enforcing
971 page-based protections, but without requiring modification of the
972 page tables when an application changes protection domains.
974 For details, see Documentation/core-api/protection-keys.rst
978 config PPC_SECURE_BOOT
979 prompt "Enable secure boot support"
981 depends on PPC_POWERNV
982 depends on IMA_ARCH_POLICY
984 Systems with firmware secure boot enabled need to define security
985 policies to extend secure boot to the OS. This config allows a user
986 to enable OS secure boot on systems that have firmware support for
987 it. If in doubt say N.
989 config PPC_SECVAR_SYSFS
990 bool "Enable sysfs interface for POWER secure variables"
992 depends on PPC_SECURE_BOOT
995 POWER secure variables are managed and controlled by firmware.
996 These variables are exposed to userspace via sysfs to enable
997 read/write operations on these variables. Say Y if you have
998 secure boot enabled and want to expose variables to userspace.
1009 bool "Support for ISA-bus hardware"
1013 Find out whether you have ISA slots on your motherboard. ISA is the
1014 name of a bus system, i.e. the way the CPU talks to the other stuff
1015 inside your box. If you have an Apple machine, say N here; if you
1016 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1017 embedded board, consult your board documentation.
1019 config GENERIC_ISA_DMA
1021 depends on ISA_DMA_API
1024 config PPC_INDIRECT_PCI
1027 default y if 40x || 44x
1037 select ARCH_HAS_DMA_SET_MASK
1038 select PPC_INDIRECT_PCI
1044 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1046 Freescale MPC85xx/MPC86xx power management controller support
1047 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1052 depends on SUSPEND && (44x || 40x)
1054 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1055 It also enables support for two different idle states (idle-wait
1062 bool "Freescale Local Bus support"
1064 Enables reporting of errors from the Freescale local bus
1065 controller. Also contains some common code used by
1066 drivers for specific local bus peripherals.
1070 depends on PPC_83xx || QUICC_ENGINE || CPM2
1072 Freescale General-purpose Timers support
1076 depends on PCI && 8260
1077 select PPC_INDIRECT_PCI
1081 bool "Freescale Embedded SRIO Controller support"
1082 depends on RAPIDIO = y && HAVE_RAPIDIO
1085 Include support for RapidIO controller on Freescale embedded
1086 processors (MPC8548, MPC8641, etc).
1090 config NONSTATIC_KERNEL
1093 menu "Advanced setup"
1096 config ADVANCED_OPTIONS
1097 bool "Prompt for advanced kernel configuration options"
1099 This option will enable prompting for a variety of advanced kernel
1100 configuration options. These options can cause the kernel to not
1101 work if they are set incorrectly, but can be used to optimize certain
1102 aspects of kernel memory management.
1104 Unless you know what you are doing, say N here.
1106 comment "Default settings for advanced configuration options are used"
1107 depends on !ADVANCED_OPTIONS
1109 config LOWMEM_SIZE_BOOL
1110 bool "Set maximum low memory"
1111 depends on ADVANCED_OPTIONS
1113 This option allows you to set the maximum amount of memory which
1114 will be used as "low memory", that is, memory which the kernel can
1115 access directly, without having to set up a kernel virtual mapping.
1116 This can be useful in optimizing the layout of kernel virtual
1119 Say N here unless you know what you are doing.
1122 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1123 default "0x30000000"
1125 config LOWMEM_CAM_NUM_BOOL
1126 bool "Set number of CAMs to use to map low memory"
1127 depends on ADVANCED_OPTIONS && FSL_BOOKE
1129 This option allows you to set the maximum number of CAM slots that
1130 will be used to map low memory. There are a limited number of slots
1131 available and even more limited number that will fit in the L1 MMU.
1132 However, using more entries will allow mapping more low memory. This
1133 can be useful in optimizing the layout of kernel virtual memory.
1135 Say N here unless you know what you are doing.
1137 config LOWMEM_CAM_NUM
1138 depends on FSL_BOOKE
1139 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1142 config DYNAMIC_MEMSTART
1143 bool "Enable page aligned dynamic load address for kernel"
1144 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1145 select NONSTATIC_KERNEL
1147 This option enables the kernel to be loaded at any page aligned
1148 physical address. The kernel creates a mapping from KERNELBASE to
1149 the address where the kernel is loaded. The page size here implies
1150 the TLB page size of the mapping for kernel on the particular platform.
1151 Please refer to the init code for finding the TLB page size.
1153 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1154 kernel image, where the only restriction is the page aligned kernel
1155 load address. When this option is enabled, the compile time physical
1156 address CONFIG_PHYSICAL_START is ignored.
1158 This option is overridden by CONFIG_RELOCATABLE
1160 config PAGE_OFFSET_BOOL
1161 bool "Set custom page offset address"
1162 depends on ADVANCED_OPTIONS
1164 This option allows you to set the kernel virtual address at which
1165 the kernel will map low memory. This can be useful in optimizing
1166 the virtual memory layout of the system.
1168 Say N here unless you know what you are doing.
1171 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1172 default "0xc0000000"
1174 config KERNEL_START_BOOL
1175 bool "Set custom kernel base address"
1176 depends on ADVANCED_OPTIONS
1178 This option allows you to set the kernel virtual address at which
1179 the kernel will be loaded. Normally this should match PAGE_OFFSET
1180 however there are times (like kdump) that one might not want them
1183 Say N here unless you know what you are doing.
1186 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1187 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1188 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1189 default "0xc0000000"
1191 config PHYSICAL_START_BOOL
1192 bool "Set physical address where the kernel is loaded"
1193 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1195 This gives the physical address where the kernel is loaded.
1197 Say N here unless you know what you are doing.
1199 config PHYSICAL_START
1200 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1201 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1202 default "0x00000000"
1204 config PHYSICAL_ALIGN
1206 default "0x04000000" if FSL_BOOKE
1208 This value puts the alignment restrictions on physical address
1209 where kernel is loaded and run from. Kernel is compiled for an
1210 address which meets above alignment restriction.
1212 config TASK_SIZE_BOOL
1213 bool "Set custom user task size"
1214 depends on ADVANCED_OPTIONS
1216 This option allows you to set the amount of virtual address space
1217 allocated to user tasks. This can be useful in optimizing the
1218 virtual memory layout of the system.
1220 Say N here unless you know what you are doing.
1223 hex "Size of user task space" if TASK_SIZE_BOOL
1224 default "0x80000000" if PPC_8xx
1225 default "0xc0000000"
1228 bool "Pinned Kernel TLBs (860 ONLY)"
1229 depends on ADVANCED_OPTIONS && PPC_8xx && \
1230 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1233 bool "Pinned TLB for DATA"
1238 bool "Pinned TLB for IMMR"
1239 depends on PIN_TLB || PPC_EARLY_DEBUG_CPM
1243 bool "Pinned TLB for TEXT"
1249 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1252 default "0xc000000000000000"
1255 default "0xc000000000000000"
1256 config PHYSICAL_START
1258 default "0x00000000"
1264 config PPC_LIB_RHEAP
1267 source "arch/powerpc/kvm/Kconfig"
1269 source "kernel/livepatch/Kconfig"