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
64 config NEED_PER_CPU_PAGE_FIRST_CHUNK
68 int "Number of virtual interrupt numbers"
72 This defines the number of virtual interrupt numbers the kernel
73 can manage. Virtual interrupt numbers are what you see in
74 /proc/interrupts. If you configure your system to have too few,
75 drivers will fail to load or worse - handle with care.
79 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
84 depends on HARDLOCKUP_DETECTOR
85 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
88 This is a placeholder when the powerpc hardlockup detector
89 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
90 selected via the generic lockup detector menu which is why we
91 have no standalone config option for it here.
93 config STACKTRACE_SUPPORT
97 config TRACE_IRQFLAGS_SUPPORT
101 config LOCKDEP_SUPPORT
105 config GENERIC_LOCKBREAK
108 depends on SMP && PREEMPTION
110 config GENERIC_HWEIGHT
118 # Please keep this list sorted alphabetically.
120 select ARCH_32BIT_OFF_T if PPC32
121 select ARCH_HAS_DEBUG_VIRTUAL
122 select ARCH_HAS_DEVMEM_IS_ALLOWED
123 select ARCH_HAS_ELF_RANDOMIZE
124 select ARCH_HAS_FORTIFY_SOURCE
125 select ARCH_HAS_GCOV_PROFILE_ALL
127 select ARCH_HAS_HUGEPD if HUGETLB_PAGE
128 select ARCH_HAS_MEMREMAP_COMPAT_ALIGN
129 select ARCH_HAS_MMIOWB if PPC64
130 select ARCH_HAS_PHYS_TO_DMA
131 select ARCH_HAS_PMEM_API
132 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
133 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
134 select ARCH_HAS_PTE_SPECIAL
135 select ARCH_HAS_MEMBARRIER_CALLBACKS
136 select ARCH_HAS_MEMBARRIER_SYNC_CORE
137 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
138 select ARCH_HAS_STRICT_KERNEL_RWX if (PPC32 && !HIBERNATION)
139 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
140 select ARCH_HAS_UACCESS_FLUSHCACHE
141 select ARCH_HAS_COPY_MC if PPC64
142 select ARCH_HAS_UBSAN_SANITIZE_ALL
143 select ARCH_HAVE_NMI_SAFE_CMPXCHG
144 select ARCH_KEEP_MEMBLOCK
145 select ARCH_MIGHT_HAVE_PC_PARPORT
146 select ARCH_MIGHT_HAVE_PC_SERIO
147 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
148 select ARCH_SUPPORTS_ATOMIC_RMW
149 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC32 || PPC_BOOK3S_64
150 select ARCH_USE_BUILTIN_BSWAP
151 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
152 select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS
153 select ARCH_USE_QUEUED_SPINLOCKS if PPC_QUEUED_SPINLOCKS
154 select ARCH_WANT_IPC_PARSE_VERSION
155 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
156 select ARCH_WANT_LD_ORPHAN_WARN
157 select ARCH_WEAK_RELEASE_ACQUIRE
159 select BUILDTIME_TABLE_SORT
160 select CLONE_BACKWARDS
161 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
162 select DMA_OPS if PPC64
163 select DMA_OPS_BYPASS if PPC64
164 select DYNAMIC_FTRACE if FUNCTION_TRACER
165 select EDAC_ATOMIC_SCRUB
167 select GENERIC_ATOMIC64 if PPC32
168 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
169 select GENERIC_CMOS_UPDATE
170 select GENERIC_CPU_AUTOPROBE
171 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
172 select GENERIC_EARLY_IOREMAP
173 select GENERIC_IRQ_SHOW
174 select GENERIC_IRQ_SHOW_LEVEL
175 select GENERIC_PCI_IOMAP if PCI
176 select GENERIC_SMP_IDLE_THREAD
177 select GENERIC_STRNCPY_FROM_USER
178 select GENERIC_STRNLEN_USER
179 select GENERIC_TIME_VSYSCALL
180 select GENERIC_GETTIMEOFDAY
181 select HAVE_ARCH_AUDITSYSCALL
182 select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
183 select HAVE_ARCH_JUMP_LABEL
184 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
185 select HAVE_ARCH_KASAN_VMALLOC if PPC32 && PPC_PAGE_SHIFT <= 14
186 select HAVE_ARCH_KGDB
187 select HAVE_ARCH_MMAP_RND_BITS
188 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
189 select HAVE_ARCH_NVRAM_OPS
190 select HAVE_ARCH_SECCOMP_FILTER
191 select HAVE_ARCH_TRACEHOOK
192 select HAVE_ASM_MODVERSIONS
193 select HAVE_C_RECORDMCOUNT
194 select HAVE_CBPF_JIT if !PPC64
195 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
196 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
197 select HAVE_CONTEXT_TRACKING if PPC64
198 select HAVE_TIF_NOHZ if PPC64
199 select HAVE_DEBUG_KMEMLEAK
200 select HAVE_DEBUG_STACKOVERFLOW
201 select HAVE_DYNAMIC_FTRACE
202 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
203 select HAVE_EBPF_JIT if PPC64
204 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
206 select HAVE_FTRACE_MCOUNT_RECORD
207 select HAVE_FUNCTION_ERROR_INJECTION
208 select HAVE_FUNCTION_GRAPH_TRACER
209 select HAVE_FUNCTION_TRACER
210 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
211 select HAVE_GENERIC_VDSO
212 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
214 select HAVE_IOREMAP_PROT
215 select HAVE_IRQ_EXIT_ON_IRQ_STACK
216 select HAVE_KERNEL_GZIP
217 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
218 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
219 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
221 select HAVE_KPROBES_ON_FTRACE
222 select HAVE_KRETPROBES
223 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
224 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
225 select HAVE_MOD_ARCH_SPECIFIC
226 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
227 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
229 select HAVE_OPTPROBES if PPC64
230 select HAVE_PERF_EVENTS
231 select HAVE_PERF_EVENTS_NMI if PPC64
232 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
233 select HAVE_PERF_REGS
234 select HAVE_PERF_USER_STACK_DUMP
235 select MMU_GATHER_RCU_TABLE_FREE
236 select MMU_GATHER_PAGE_SIZE
237 select HAVE_REGS_AND_STACK_ACCESS_API
238 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
239 select HAVE_SYSCALL_TRACEPOINTS
240 select HAVE_VIRT_CPU_ACCOUNTING
241 select HAVE_IRQ_TIME_ACCOUNTING
243 select IOMMU_HELPER if PPC64
245 select IRQ_FORCED_THREADING
246 select MODULES_USE_ELF_RELA
247 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
248 select NEED_SG_DMA_LENGTH
250 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
251 select OF_EARLY_FLATTREE
252 select OLD_SIGACTION if PPC32
253 select OLD_SIGSUSPEND
254 select PCI_DOMAINS if PCI
255 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
256 select PCI_SYSCALL if PCI
257 select PPC_DAWR if PPC64
260 select SYSCTL_EXCEPTION_TRACE
261 select THREAD_INFO_IN_TASK
262 select VIRT_TO_BUS if !PPC64
264 # Please keep this list sorted alphabetically.
267 config PPC_BARRIER_NOSPEC
270 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
281 bool "Enable support for 32bit binaries"
283 default y if !CPU_LITTLE_ENDIAN
284 select COMPAT_BINFMT_ELF
285 select ARCH_WANT_OLD_COMPAT_IPC
286 select COMPAT_OLD_SIGACTION
288 config SYSVIPC_COMPAT
290 depends on COMPAT && SYSVIPC
293 config SCHED_OMIT_FRAME_POINTER
297 config ARCH_MAY_HAVE_PC_FDC
301 config PPC_UDBG_16550
304 config GENERIC_TBSYNC
306 default y if PPC32 && SMP
317 config GENERIC_BUG_RELATIVE_POINTERS
319 depends on GENERIC_BUG
321 config SYS_SUPPORTS_APM_EMULATION
322 default y if PMAC_APM_EMU
328 Used to allow a board to specify it wants an ePAPR compliant wrapper.
330 config DEFAULT_UIMAGE
333 Used to allow a board to specify it wants a uImage built by default
335 config ARCH_HIBERNATION_POSSIBLE
339 config ARCH_SUSPEND_POSSIBLE
341 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
342 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
345 config ARCH_SUSPEND_NONZERO_CPU
347 depends on PPC_POWERNV || PPC_PSERIES
349 config PPC_DCR_NATIVE
357 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
360 config PPC_OF_PLATFORM_PCI
363 depends on PPC64 # not supported on 32 bits yet
365 config ARCH_SUPPORTS_UPROBES
368 config PPC_ADV_DEBUG_REGS
370 depends on 40x || BOOKE
373 config PPC_ADV_DEBUG_IACS
375 depends on PPC_ADV_DEBUG_REGS
379 config PPC_ADV_DEBUG_DACS
381 depends on PPC_ADV_DEBUG_REGS
384 config PPC_ADV_DEBUG_DVCS
386 depends on PPC_ADV_DEBUG_REGS
390 config PPC_ADV_DEBUG_DAC_RANGE
392 depends on PPC_ADV_DEBUG_REGS && 44x
400 default y if PPC_BOOK3E_64
402 config PGTABLE_LEVELS
407 source "arch/powerpc/sysdev/Kconfig"
408 source "arch/powerpc/platforms/Kconfig"
410 menu "Kernel options"
413 bool "High memory support"
417 source "kernel/Kconfig.hz"
419 config HUGETLB_PAGE_SIZE_VARIABLE
421 depends on HUGETLB_PAGE && PPC_BOOK3S_64
424 config MATH_EMULATION
425 bool "Math emulation"
426 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
429 Some PowerPC chips designed for embedded applications do not have
430 a floating-point unit and therefore do not implement the
431 floating-point instructions in the PowerPC instruction set. If you
432 say Y here, the kernel will include code to emulate a floating-point
433 unit, which will allow programs that use floating-point
436 This is also useful to emulate missing (optional) instructions
437 such as fsqrt on cores that do have an FPU but do not implement
438 them (such as Freescale BookE).
441 prompt "Math emulation options"
442 default MATH_EMULATION_FULL
443 depends on MATH_EMULATION
445 config MATH_EMULATION_FULL
446 bool "Emulate all the floating point instructions"
448 Select this option will enable the kernel to support to emulate
449 all the floating point instructions. If your SoC doesn't have
450 a FPU, you should select this.
452 config MATH_EMULATION_HW_UNIMPLEMENTED
453 bool "Just emulate the FPU unimplemented instructions"
455 Select this if you know there does have a hardware FPU on your
456 SoC, but some floating point instructions are not implemented by that.
460 config PPC_TRANSACTIONAL_MEM
461 bool "Transactional Memory support for POWERPC"
462 depends on PPC_BOOK3S_64
467 Support user-mode Transactional Memory on POWERPC.
470 bool "Ultravisor support"
471 depends on KVM_BOOK3S_HV_POSSIBLE
472 depends on DEVICE_PRIVATE
475 This option paravirtualizes the kernel to run in POWER platforms that
476 supports the Protected Execution Facility (PEF). On such platforms,
477 the ultravisor firmware runs at a privilege level above the
482 config LD_HEAD_STUB_CATCH
483 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
486 Very large kernels can cause linker branch stubs to be generated by
487 code in head_64.S, which moves the head text sections out of their
488 specified location. This option can work around the problem.
492 config MPROFILE_KERNEL
493 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
494 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
497 bool "Support for enabling/disabling CPUs"
498 depends on SMP && (PPC_PSERIES || \
499 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
501 Say Y here to be able to disable and re-enable individual
502 CPUs at runtime on SMP machines.
504 Say N if you are unsure.
506 config PPC_QUEUED_SPINLOCKS
507 bool "Queued spinlocks"
510 Say Y here to use queued spinlocks which give better scalability and
511 fairness on large SMP and NUMA systems without harming single threaded
514 This option is currently experimental, the code is more complex and
515 less tested so it defaults to "N" for the moment.
519 config ARCH_CPU_PROBE_RELEASE
521 depends on HOTPLUG_CPU
523 config ARCH_ENABLE_MEMORY_HOTPLUG
526 config ARCH_ENABLE_MEMORY_HOTREMOVE
529 config PPC64_SUPPORTS_MEMORY_FAILURE
530 bool "Add support for memory hwpoison"
531 depends on PPC_BOOK3S_64
532 default "y" if PPC_POWERNV
533 select ARCH_SUPPORTS_MEMORY_FAILURE
536 bool "kexec system call"
537 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
540 kexec is a system call that implements the ability to shutdown your
541 current kernel, and to start another kernel. It is like a reboot
542 but it is independent of the system firmware. And like a reboot
543 you can start any kernel with it, not just Linux.
545 The name comes from the similarity to the exec system call.
547 It is an ongoing process to be certain the hardware in a machine
548 is properly shutdown, so do not be surprised if this code does not
549 initially work for you. As of this writing the exact hardware
550 interface is strongly in flux, so no good recommendation can be
554 bool "kexec file based system call"
556 select HAVE_IMA_KEXEC
561 depends on CRYPTO_SHA256=y
563 This is a new version of the kexec system call. This call is
564 file based and takes in file descriptors as system call arguments
565 for kernel and initramfs as opposed to a list of segments as is the
566 case for the older kexec call.
568 config ARCH_HAS_KEXEC_PURGATORY
572 bool "Build a relocatable kernel"
573 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
574 select NONSTATIC_KERNEL
575 select MODULE_REL_CRCS if MODVERSIONS
577 This builds a kernel image that is capable of running at the
578 location the kernel is loaded at. For ppc32, there is no any
579 alignment restrictions, and this feature is a superset of
580 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
581 16k-aligned base address. The kernel is linked as a
582 position-independent executable (PIE) and contains dynamic relocations
583 which are processed early in the bootup process.
585 One use is for the kexec on panic case where the recovery kernel
586 must live at a different physical address than the primary
589 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
590 it has been loaded at and the compile time physical addresses
591 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
592 setting can still be useful to bootwrappers that need to know the
593 load address of the kernel (eg. u-boot/mkimage).
595 config RANDOMIZE_BASE
596 bool "Randomize the address of the kernel image"
597 depends on (FSL_BOOKE && FLATMEM && PPC32)
598 depends on RELOCATABLE
600 Randomizes the virtual address at which the kernel image is
601 loaded, as a security feature that deters exploit attempts
602 relying on knowledge of the location of kernel internals.
606 config RELOCATABLE_TEST
607 bool "Test relocatable kernel"
608 depends on (PPC64 && RELOCATABLE)
610 This runs the relocatable kernel at the address it was initially
611 loaded at, which tends to be non-zero and therefore test the
615 bool "Build a dump capture kernel"
616 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
617 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
619 Build a kernel suitable for use as a dump capture kernel.
620 The same kernel binary can be used as production kernel and dump
624 bool "Firmware-assisted dump"
625 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
629 A robust mechanism to get reliable kernel crash dump with
630 assistance from firmware. This approach does not use kexec,
631 instead firmware assists in booting the capture kernel
632 while preserving memory contents. Firmware-assisted dump
633 is meant to be a kdump replacement offering robustness and
634 speed not possible without system firmware assistance.
636 If unsure, say "y". Only special kernels like petitboot may
637 need to say "N" here.
639 config PRESERVE_FA_DUMP
640 bool "Preserve Firmware-assisted dump"
641 depends on PPC64 && PPC_POWERNV && !FA_DUMP
643 On a kernel with FA_DUMP disabled, this option helps to preserve
644 crash data from a previously crash'ed kernel. Useful when the next
645 memory preserving kernel boot would process this crash data.
646 Petitboot kernel is the typical usecase for this option.
649 bool "Export OPAL memory as /sys/firmware/opal/core"
650 depends on PPC64 && PPC_POWERNV
652 This option uses the MPIPL support in firmware to provide an
653 ELF core of OPAL memory after a crash. The ELF core is exported
654 as /sys/firmware/opal/core file which is helpful in debugging
655 OPAL crashes using GDB.
658 bool "Distribute interrupts on all CPUs by default"
661 This option gives the kernel permission to distribute IRQs across
662 multiple CPUs. Saying N here will route all IRQs to the first
663 CPU. Generally saying Y is safe, although some problems have been
664 reported with SMP Power Macintoshes with this option enabled.
667 bool "NUMA Memory Allocation and Scheduler Support"
668 depends on PPC64 && SMP
669 default y if PPC_PSERIES || PPC_POWERNV
671 Enable NUMA (Non-Uniform Memory Access) support.
673 The kernel will try to allocate memory used by a CPU on the
674 local memory controller of the CPU and add some more
675 NUMA awareness to the kernel.
681 depends on NEED_MULTIPLE_NODES
683 config USE_PERCPU_NUMA_NODE_ID
687 config HAVE_MEMORYLESS_NODES
691 config ARCH_SELECT_MEMORY_MODEL
695 config ARCH_FLATMEM_ENABLE
697 depends on (PPC64 && !NUMA) || PPC32
699 config ARCH_SPARSEMEM_ENABLE
702 select SPARSEMEM_VMEMMAP_ENABLE
704 config ARCH_SPARSEMEM_DEFAULT
706 depends on PPC_BOOK3S_64
708 config SYS_SUPPORTS_HUGETLBFS
711 config ILLEGAL_POINTER_VALUE
713 # This is roughly half way between the top of user space and the bottom
714 # of kernel space, which seems about as good as we can get.
715 default 0x5deadbeef0000000 if PPC64
718 config ARCH_MEMORY_PROBE
720 depends on MEMORY_HOTPLUG
723 bool "Using standard binutils settings"
727 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
728 Note, that kernel will be able to run only those applications,
729 which had been compiled using binutils later than 2.17.50.0.3 with
730 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
731 the older binutils, you can patch them with a trivial patch, which
732 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
738 Select the kernel logical page size. Increasing the page size
739 will reduce software overhead at each page boundary, allow
740 hardware prefetch mechanisms to be more effective, and allow
741 larger dma transfers increasing IO efficiency and reducing
742 overhead. However the utilization of memory will increase.
743 For example, each cached file will using a multiple of the
744 page size to hold its contents and the difference between the
745 end of file and the end of page is wasted.
747 Some dedicated systems, such as software raid serving with
748 accelerated calculations, have shown significant increases.
750 If you configure a 64 bit kernel for 64k pages but the
751 processor does not support them, then the kernel will simulate
752 them with 4k pages, loading them on demand, but with the
753 reduced software overhead and larger internal fragmentation.
754 For the 32 bit kernel, a large page option will not be offered
755 unless it is supported by the configured processor.
757 If unsure, choose 4K_PAGES.
761 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
765 depends on 44x || PPC_8xx
769 depends on 44x || PPC_BOOK3S_64
770 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
772 config PPC_256K_PAGES
773 bool "256k page size"
774 depends on 44x && !STDBINUTILS
776 Make the page size 256k.
778 As the ELF standard only requires alignment to support page
779 sizes up to 64k, you will need to compile all of your user
780 space applications with a non-standard binutils settings
781 (see the STDBINUTILS description for details).
783 Say N unless you know what you are doing.
787 config PPC_PAGE_SHIFT
789 default 18 if PPC_256K_PAGES
790 default 16 if PPC_64K_PAGES
791 default 14 if PPC_16K_PAGES
795 int "Thread shift" if EXPERT
797 default "15" if PPC_256K_PAGES
798 default "14" if PPC64
799 default "14" if KASAN
802 Used to define the stack size. The default is almost always what you
803 want. Only change this if you know what you are doing.
805 config DATA_SHIFT_BOOL
806 bool "Set custom data alignment"
807 depends on ADVANCED_OPTIONS
808 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC
809 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX)
811 This option allows you to set the kernel data alignment. When
812 RAM is mapped by blocks, the alignment needs to fit the size and
813 number of possible blocks. The default should be OK for most configs.
815 Say N here unless you know what you are doing.
818 int "Data shift" if DATA_SHIFT_BOOL
819 default 24 if STRICT_KERNEL_RWX && PPC64
820 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_BOOK3S_32
821 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_8xx
822 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
823 default 18 if DEBUG_PAGEALLOC && PPC_BOOK3S_32
824 default 23 if STRICT_KERNEL_RWX && PPC_8xx
825 default 23 if DEBUG_PAGEALLOC && PPC_8xx && PIN_TLB_DATA
826 default 19 if DEBUG_PAGEALLOC && PPC_8xx
827 default PPC_PAGE_SHIFT
829 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
830 Smaller is the alignment, greater is the number of necessary DBATs.
832 On 8xx, large pages (512kb or 8M) are used to map kernel linear
833 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
834 in that case. If PIN_TLB is selected, it must be aligned to 8M as
835 8M pages will be pinned.
837 config FORCE_MAX_ZONEORDER
838 int "Maximum zone order"
839 range 8 9 if PPC64 && PPC_64K_PAGES
840 default "9" if PPC64 && PPC_64K_PAGES
841 range 13 13 if PPC64 && !PPC_64K_PAGES
842 default "13" if PPC64 && !PPC_64K_PAGES
843 range 9 64 if PPC32 && PPC_16K_PAGES
844 default "9" if PPC32 && PPC_16K_PAGES
845 range 7 64 if PPC32 && PPC_64K_PAGES
846 default "7" if PPC32 && PPC_64K_PAGES
847 range 5 64 if PPC32 && PPC_256K_PAGES
848 default "5" if PPC32 && PPC_256K_PAGES
852 The kernel memory allocator divides physically contiguous memory
853 blocks into "zones", where each zone is a power of two number of
854 pages. This option selects the largest power of two that the kernel
855 keeps in the memory allocator. If you need to allocate very large
856 blocks of physically contiguous memory, then you may need to
859 This config option is actually maximum order plus one. For example,
860 a value of 11 means that the largest free memory block is 2^10 pages.
862 The page size is not necessarily 4KB. For example, on 64-bit
863 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
864 this in mind when choosing a value for this option.
866 config PPC_SUBPAGE_PROT
867 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
869 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
871 This option adds support for system call to allow user programs
872 to set access permissions (read/write, readonly, or no access)
873 on the 4k subpages of each 64k page.
875 If unsure, say N here.
877 config PPC_PROT_SAO_LPAR
878 bool "Support PROT_SAO mappings in LPARs"
879 depends on PPC_BOOK3S_64
881 This option adds support for PROT_SAO mappings from userspace
882 inside LPARs on supported CPUs.
884 This may cause issues when performing guest migration from
885 a CPU that supports SAO to one that does not.
887 If unsure, say N here.
889 config PPC_COPRO_BASE
893 bool "SMT (Hyperthreading) scheduler support"
894 depends on PPC64 && SMP
896 SMT scheduler support improves the CPU scheduler's decision making
897 when dealing with POWER5 cpus at a cost of slightly increased
898 overhead in some places. If unsure say N here.
900 config PPC_DENORMALISATION
901 bool "PowerPC denormalisation exception handling"
902 depends on PPC_BOOK3S_64
903 default "y" if PPC_POWERNV
905 Add support for handling denormalisation of single precision
906 values. Useful for bare metal only. If unsure say Y here.
909 string "Initial kernel command string"
912 On some platforms, there is currently no way for the boot loader to
913 pass arguments to the kernel. For these platforms, you can supply
914 some command-line options at build time by entering them here. In
915 most cases you will need to specify the root device here.
918 prompt "Kernel command line type" if CMDLINE != ""
919 default CMDLINE_FROM_BOOTLOADER
921 config CMDLINE_FROM_BOOTLOADER
922 bool "Use bootloader kernel arguments if available"
924 Uses the command-line options passed by the boot loader. If
925 the boot loader doesn't provide any, the default kernel command
926 string provided in CMDLINE will be used.
928 config CMDLINE_EXTEND
929 bool "Extend bootloader kernel arguments"
931 The command-line arguments provided by the boot loader will be
932 appended to the default kernel command string.
935 bool "Always use the default kernel command string"
937 Always use the default kernel command string, even if the boot
938 loader passes other arguments to the kernel.
939 This is useful if you cannot or don't want to change the
940 command-line options your boot loader passes to the kernel.
945 string "Additional default image types"
947 List additional targets to be built by the bootwrapper here (separated
948 by spaces). This is useful for targets that depend of device tree
949 files in the .dts directory.
951 Targets in this list will be build as part of the default build
952 target, or when the user does a 'make zImage' or a
953 'make zImage.initrd'.
955 If unsure, leave blank
957 config ARCH_WANTS_FREEZER_CONTROL
961 source "kernel/power/Kconfig"
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 || PPC_PSERIES
982 depends on IMA_ARCH_POLICY
983 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
985 Systems with firmware secure boot enabled need to define security
986 policies to extend secure boot to the OS. This config allows a user
987 to enable OS secure boot on systems that have firmware support for
988 it. If in doubt say N.
990 config PPC_SECVAR_SYSFS
991 bool "Enable sysfs interface for POWER secure variables"
993 depends on PPC_SECURE_BOOT
996 POWER secure variables are managed and controlled by firmware.
997 These variables are exposed to userspace via sysfs to enable
998 read/write operations on these variables. Say Y if you have
999 secure boot enabled and want to expose variables to userspace.
1001 config PPC_RTAS_FILTER
1002 bool "Enable filtering of RTAS syscalls"
1006 The RTAS syscall API has security issues that could be used to
1007 compromise system integrity. This option enforces restrictions on the
1008 RTAS calls and arguments passed by userspace programs to mitigate
1011 Say Y unless you know what you are doing and the filter is causing
1023 bool "Support for ISA-bus hardware"
1027 Find out whether you have ISA slots on your motherboard. ISA is the
1028 name of a bus system, i.e. the way the CPU talks to the other stuff
1029 inside your box. If you have an Apple machine, say N here; if you
1030 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1031 embedded board, consult your board documentation.
1033 config GENERIC_ISA_DMA
1035 depends on ISA_DMA_API
1038 config PPC_INDIRECT_PCI
1041 default y if 40x || 44x
1051 select ARCH_HAS_DMA_SET_MASK
1052 select PPC_INDIRECT_PCI
1058 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1060 Freescale MPC85xx/MPC86xx power management controller support
1061 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1066 depends on SUSPEND && (44x || 40x)
1068 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1069 It also enables support for two different idle states (idle-wait
1076 bool "Freescale Local Bus support"
1078 Enables reporting of errors from the Freescale local bus
1079 controller. Also contains some common code used by
1080 drivers for specific local bus peripherals.
1084 depends on PPC_83xx || QUICC_ENGINE || CPM2
1086 Freescale General-purpose Timers support
1090 depends on PCI && 8260
1091 select PPC_INDIRECT_PCI
1095 bool "Freescale Embedded SRIO Controller support"
1096 depends on RAPIDIO = y && HAVE_RAPIDIO
1099 Include support for RapidIO controller on Freescale embedded
1100 processors (MPC8548, MPC8641, etc).
1104 config NONSTATIC_KERNEL
1107 menu "Advanced setup"
1110 config ADVANCED_OPTIONS
1111 bool "Prompt for advanced kernel configuration options"
1113 This option will enable prompting for a variety of advanced kernel
1114 configuration options. These options can cause the kernel to not
1115 work if they are set incorrectly, but can be used to optimize certain
1116 aspects of kernel memory management.
1118 Unless you know what you are doing, say N here.
1120 comment "Default settings for advanced configuration options are used"
1121 depends on !ADVANCED_OPTIONS
1123 config LOWMEM_SIZE_BOOL
1124 bool "Set maximum low memory"
1125 depends on ADVANCED_OPTIONS
1127 This option allows you to set the maximum amount of memory which
1128 will be used as "low memory", that is, memory which the kernel can
1129 access directly, without having to set up a kernel virtual mapping.
1130 This can be useful in optimizing the layout of kernel virtual
1133 Say N here unless you know what you are doing.
1136 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1137 default "0x30000000"
1139 config LOWMEM_CAM_NUM_BOOL
1140 bool "Set number of CAMs to use to map low memory"
1141 depends on ADVANCED_OPTIONS && FSL_BOOKE
1143 This option allows you to set the maximum number of CAM slots that
1144 will be used to map low memory. There are a limited number of slots
1145 available and even more limited number that will fit in the L1 MMU.
1146 However, using more entries will allow mapping more low memory. This
1147 can be useful in optimizing the layout of kernel virtual memory.
1149 Say N here unless you know what you are doing.
1151 config LOWMEM_CAM_NUM
1152 depends on FSL_BOOKE
1153 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1156 config DYNAMIC_MEMSTART
1157 bool "Enable page aligned dynamic load address for kernel"
1158 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1159 select NONSTATIC_KERNEL
1161 This option enables the kernel to be loaded at any page aligned
1162 physical address. The kernel creates a mapping from KERNELBASE to
1163 the address where the kernel is loaded. The page size here implies
1164 the TLB page size of the mapping for kernel on the particular platform.
1165 Please refer to the init code for finding the TLB page size.
1167 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1168 kernel image, where the only restriction is the page aligned kernel
1169 load address. When this option is enabled, the compile time physical
1170 address CONFIG_PHYSICAL_START is ignored.
1172 This option is overridden by CONFIG_RELOCATABLE
1174 config PAGE_OFFSET_BOOL
1175 bool "Set custom page offset address"
1176 depends on ADVANCED_OPTIONS
1178 This option allows you to set the kernel virtual address at which
1179 the kernel will map low memory. This can be useful in optimizing
1180 the virtual memory layout of the system.
1182 Say N here unless you know what you are doing.
1185 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1186 default "0xc0000000"
1188 config KERNEL_START_BOOL
1189 bool "Set custom kernel base address"
1190 depends on ADVANCED_OPTIONS
1192 This option allows you to set the kernel virtual address at which
1193 the kernel will be loaded. Normally this should match PAGE_OFFSET
1194 however there are times (like kdump) that one might not want them
1197 Say N here unless you know what you are doing.
1200 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1201 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1202 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1203 default "0xc0000000"
1205 config PHYSICAL_START_BOOL
1206 bool "Set physical address where the kernel is loaded"
1207 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1209 This gives the physical address where the kernel is loaded.
1211 Say N here unless you know what you are doing.
1213 config PHYSICAL_START
1214 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1215 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1216 default "0x00000000"
1218 config PHYSICAL_ALIGN
1220 default "0x04000000" if FSL_BOOKE
1222 This value puts the alignment restrictions on physical address
1223 where kernel is loaded and run from. Kernel is compiled for an
1224 address which meets above alignment restriction.
1226 config TASK_SIZE_BOOL
1227 bool "Set custom user task size"
1228 depends on ADVANCED_OPTIONS
1230 This option allows you to set the amount of virtual address space
1231 allocated to user tasks. This can be useful in optimizing the
1232 virtual memory layout of the system.
1234 Say N here unless you know what you are doing.
1237 hex "Size of user task space" if TASK_SIZE_BOOL
1238 default "0x80000000" if PPC_8xx
1239 default "0xb0000000" if PPC_BOOK3S_32 && STRICT_KERNEL_RWX
1240 default "0xc0000000"
1244 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1247 default "0xc000000000000000"
1250 default "0xc000000000000000"
1251 config PHYSICAL_START
1253 default "0x00000000"
1259 config PPC_LIB_RHEAP
1262 source "arch/powerpc/kvm/Kconfig"
1264 source "kernel/livepatch/Kconfig"