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_DEBUG_VM_PGTABLE
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_MEMREMAP_COMPAT_ALIGN
130 select ARCH_HAS_MMIOWB if PPC64
131 select ARCH_HAS_PHYS_TO_DMA
132 select ARCH_HAS_PMEM_API
133 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
134 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
135 select ARCH_HAS_PTE_SPECIAL
136 select ARCH_HAS_MEMBARRIER_CALLBACKS
137 select ARCH_HAS_MEMBARRIER_SYNC_CORE
138 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
139 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !HIBERNATION)
140 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
141 select ARCH_HAS_UACCESS_FLUSHCACHE
142 select ARCH_HAS_COPY_MC if PPC64
143 select ARCH_HAS_UBSAN_SANITIZE_ALL
144 select ARCH_HAVE_NMI_SAFE_CMPXCHG
145 select ARCH_KEEP_MEMBLOCK
146 select ARCH_MIGHT_HAVE_PC_PARPORT
147 select ARCH_MIGHT_HAVE_PC_SERIO
148 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
149 select ARCH_STACKWALK
150 select ARCH_SUPPORTS_ATOMIC_RMW
151 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC32 || PPC_BOOK3S_64
152 select ARCH_USE_BUILTIN_BSWAP
153 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
154 select ARCH_USE_MEMTEST
155 select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS
156 select ARCH_USE_QUEUED_SPINLOCKS if PPC_QUEUED_SPINLOCKS
157 select ARCH_WANT_IPC_PARSE_VERSION
158 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
159 select ARCH_WANT_LD_ORPHAN_WARN
160 select ARCH_WEAK_RELEASE_ACQUIRE
162 select BUILDTIME_TABLE_SORT
163 select CLONE_BACKWARDS
164 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
165 select DMA_OPS if PPC64
166 select DMA_OPS_BYPASS if PPC64
167 select ARCH_HAS_DMA_MAP_DIRECT if PPC64 && PPC_PSERIES
168 select DYNAMIC_FTRACE if FUNCTION_TRACER
169 select EDAC_ATOMIC_SCRUB
171 select GENERIC_ATOMIC64 if PPC32
172 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
173 select GENERIC_CMOS_UPDATE
174 select GENERIC_CPU_AUTOPROBE
175 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
176 select GENERIC_EARLY_IOREMAP
177 select GENERIC_GETTIMEOFDAY
178 select GENERIC_IRQ_SHOW
179 select GENERIC_IRQ_SHOW_LEVEL
180 select GENERIC_PCI_IOMAP if PCI
181 select GENERIC_SMP_IDLE_THREAD
182 select GENERIC_STRNCPY_FROM_USER
183 select GENERIC_STRNLEN_USER
184 select GENERIC_TIME_VSYSCALL
185 select GENERIC_VDSO_TIME_NS
186 select HAVE_ARCH_AUDITSYSCALL
187 select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
188 select HAVE_ARCH_JUMP_LABEL
189 select HAVE_ARCH_JUMP_LABEL_RELATIVE
190 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
191 select HAVE_ARCH_KASAN_VMALLOC if PPC32 && PPC_PAGE_SHIFT <= 14
192 select HAVE_ARCH_KGDB
193 select HAVE_ARCH_KFENCE if PPC32
194 select HAVE_ARCH_MMAP_RND_BITS
195 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
196 select HAVE_ARCH_NVRAM_OPS
197 select HAVE_ARCH_SECCOMP_FILTER
198 select HAVE_ARCH_TRACEHOOK
199 select HAVE_ASM_MODVERSIONS
200 select HAVE_C_RECORDMCOUNT
201 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
202 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
203 select HAVE_CONTEXT_TRACKING if PPC64
204 select HAVE_DEBUG_KMEMLEAK
205 select HAVE_DEBUG_STACKOVERFLOW
206 select HAVE_DYNAMIC_FTRACE
207 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
209 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
211 select HAVE_FTRACE_MCOUNT_RECORD
212 select HAVE_FUNCTION_ERROR_INJECTION
213 select HAVE_FUNCTION_GRAPH_TRACER
214 select HAVE_FUNCTION_TRACER
215 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
216 select HAVE_GENERIC_VDSO
217 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
219 select HAVE_IOREMAP_PROT
220 select HAVE_IRQ_EXIT_ON_IRQ_STACK
221 select HAVE_KERNEL_GZIP
222 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
223 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
224 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
226 select HAVE_KPROBES_ON_FTRACE
227 select HAVE_KRETPROBES
228 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
229 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
230 select HAVE_MOD_ARCH_SPECIFIC
231 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
232 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC64 && PPC_BOOK3S && SMP
233 select HAVE_OPTPROBES
234 select HAVE_PERF_EVENTS
235 select HAVE_PERF_EVENTS_NMI if PPC64
236 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
237 select HAVE_PERF_REGS
238 select HAVE_PERF_USER_STACK_DUMP
239 select MMU_GATHER_RCU_TABLE_FREE
240 select MMU_GATHER_PAGE_SIZE
241 select HAVE_REGS_AND_STACK_ACCESS_API
242 select HAVE_RELIABLE_STACKTRACE
243 select HAVE_SOFTIRQ_ON_OWN_STACK
244 select HAVE_SYSCALL_TRACEPOINTS
245 select HAVE_VIRT_CPU_ACCOUNTING
246 select HAVE_IRQ_TIME_ACCOUNTING
248 select IOMMU_HELPER if PPC64
250 select IRQ_FORCED_THREADING
251 select MODULES_USE_ELF_RELA
252 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
253 select NEED_SG_DMA_LENGTH
255 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
256 select OF_EARLY_FLATTREE
257 select OLD_SIGACTION if PPC32
258 select OLD_SIGSUSPEND
259 select PCI_DOMAINS if PCI
260 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
261 select PCI_SYSCALL if PCI
262 select PPC_DAWR if PPC64
265 select SYSCTL_EXCEPTION_TRACE
266 select THREAD_INFO_IN_TASK
267 select VIRT_TO_BUS if !PPC64
269 # Please keep this list sorted alphabetically.
272 config PPC_BARRIER_NOSPEC
275 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
286 bool "Enable support for 32bit binaries"
288 default y if !CPU_LITTLE_ENDIAN
289 select ARCH_WANT_OLD_COMPAT_IPC
290 select COMPAT_OLD_SIGACTION
292 config SYSVIPC_COMPAT
294 depends on COMPAT && SYSVIPC
297 config SCHED_OMIT_FRAME_POINTER
301 config ARCH_MAY_HAVE_PC_FDC
305 config PPC_UDBG_16550
308 config GENERIC_TBSYNC
310 default y if PPC32 && SMP
321 config GENERIC_BUG_RELATIVE_POINTERS
323 depends on GENERIC_BUG
325 config SYS_SUPPORTS_APM_EMULATION
326 default y if PMAC_APM_EMU
332 Used to allow a board to specify it wants an ePAPR compliant wrapper.
334 config DEFAULT_UIMAGE
337 Used to allow a board to specify it wants a uImage built by default
339 config ARCH_HIBERNATION_POSSIBLE
343 config ARCH_SUSPEND_POSSIBLE
345 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
346 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
349 config ARCH_SUSPEND_NONZERO_CPU
351 depends on PPC_POWERNV || PPC_PSERIES
353 config PPC_DCR_NATIVE
361 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
364 config PPC_OF_PLATFORM_PCI
367 depends on PPC64 # not supported on 32 bits yet
369 config ARCH_SUPPORTS_UPROBES
372 config PPC_ADV_DEBUG_REGS
374 depends on 40x || BOOKE
377 config PPC_ADV_DEBUG_IACS
379 depends on PPC_ADV_DEBUG_REGS
383 config PPC_ADV_DEBUG_DACS
385 depends on PPC_ADV_DEBUG_REGS
388 config PPC_ADV_DEBUG_DVCS
390 depends on PPC_ADV_DEBUG_REGS
394 config PPC_ADV_DEBUG_DAC_RANGE
396 depends on PPC_ADV_DEBUG_REGS && 44x
404 default y if PPC_BOOK3E_64
406 config PGTABLE_LEVELS
411 source "arch/powerpc/sysdev/Kconfig"
412 source "arch/powerpc/platforms/Kconfig"
414 menu "Kernel options"
417 bool "High memory support"
421 source "kernel/Kconfig.hz"
423 config HUGETLB_PAGE_SIZE_VARIABLE
425 depends on HUGETLB_PAGE && PPC_BOOK3S_64
428 config MATH_EMULATION
429 bool "Math emulation"
430 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
433 Some PowerPC chips designed for embedded applications do not have
434 a floating-point unit and therefore do not implement the
435 floating-point instructions in the PowerPC instruction set. If you
436 say Y here, the kernel will include code to emulate a floating-point
437 unit, which will allow programs that use floating-point
440 This is also useful to emulate missing (optional) instructions
441 such as fsqrt on cores that do have an FPU but do not implement
442 them (such as Freescale BookE).
445 prompt "Math emulation options"
446 default MATH_EMULATION_FULL
447 depends on MATH_EMULATION
449 config MATH_EMULATION_FULL
450 bool "Emulate all the floating point instructions"
452 Select this option will enable the kernel to support to emulate
453 all the floating point instructions. If your SoC doesn't have
454 a FPU, you should select this.
456 config MATH_EMULATION_HW_UNIMPLEMENTED
457 bool "Just emulate the FPU unimplemented instructions"
459 Select this if you know there does have a hardware FPU on your
460 SoC, but some floating point instructions are not implemented by that.
464 config PPC_TRANSACTIONAL_MEM
465 bool "Transactional Memory support for POWERPC"
466 depends on PPC_BOOK3S_64
471 Support user-mode Transactional Memory on POWERPC.
474 bool "Ultravisor support"
475 depends on KVM_BOOK3S_HV_POSSIBLE
476 depends on DEVICE_PRIVATE
479 This option paravirtualizes the kernel to run in POWER platforms that
480 supports the Protected Execution Facility (PEF). On such platforms,
481 the ultravisor firmware runs at a privilege level above the
486 config LD_HEAD_STUB_CATCH
487 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
490 Very large kernels can cause linker branch stubs to be generated by
491 code in head_64.S, which moves the head text sections out of their
492 specified location. This option can work around the problem.
496 config MPROFILE_KERNEL
497 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
498 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
501 bool "Support for enabling/disabling CPUs"
502 depends on SMP && (PPC_PSERIES || \
503 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
505 Say Y here to be able to disable and re-enable individual
506 CPUs at runtime on SMP machines.
508 Say N if you are unsure.
510 config PPC_QUEUED_SPINLOCKS
511 bool "Queued spinlocks" if EXPERT
513 default PPC_BOOK3S_64
515 Say Y here to use queued spinlocks which give better scalability and
516 fairness on large SMP and NUMA systems without harming single threaded
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 if IMA
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
726 Select the kernel logical page size. Increasing the page size
727 will reduce software overhead at each page boundary, allow
728 hardware prefetch mechanisms to be more effective, and allow
729 larger dma transfers increasing IO efficiency and reducing
730 overhead. However the utilization of memory will increase.
731 For example, each cached file will using a multiple of the
732 page size to hold its contents and the difference between the
733 end of file and the end of page is wasted.
735 Some dedicated systems, such as software raid serving with
736 accelerated calculations, have shown significant increases.
738 If you configure a 64 bit kernel for 64k pages but the
739 processor does not support them, then the kernel will simulate
740 them with 4k pages, loading them on demand, but with the
741 reduced software overhead and larger internal fragmentation.
742 For the 32 bit kernel, a large page option will not be offered
743 unless it is supported by the configured processor.
745 If unsure, choose 4K_PAGES.
749 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
753 depends on 44x || PPC_8xx
757 depends on 44x || PPC_BOOK3S_64
758 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
760 config PPC_256K_PAGES
761 bool "256k page size (Requires non-standard binutils settings)"
762 depends on 44x && !PPC_47x
764 Make the page size 256k.
766 The kernel will only be able to run applications that have been
767 compiled with '-zmax-page-size' set to 256K (the default is 64K) using
768 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
769 definition from 0x10000 to 0x40000 in older versions.
773 config PPC_PAGE_SHIFT
775 default 18 if PPC_256K_PAGES
776 default 16 if PPC_64K_PAGES
777 default 14 if PPC_16K_PAGES
781 int "Thread shift" if EXPERT
783 default "15" if PPC_256K_PAGES
784 default "14" if PPC64
785 default "14" if KASAN
788 Used to define the stack size. The default is almost always what you
789 want. Only change this if you know what you are doing.
791 config DATA_SHIFT_BOOL
792 bool "Set custom data alignment"
793 depends on ADVANCED_OPTIONS
794 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE
795 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX)
797 This option allows you to set the kernel data alignment. When
798 RAM is mapped by blocks, the alignment needs to fit the size and
799 number of possible blocks. The default should be OK for most configs.
801 Say N here unless you know what you are doing.
804 int "Data shift" if DATA_SHIFT_BOOL
805 default 24 if STRICT_KERNEL_RWX && PPC64
806 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
807 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
808 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
809 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
810 default 23 if STRICT_KERNEL_RWX && PPC_8xx
811 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA
812 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
813 default PPC_PAGE_SHIFT
815 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
816 Smaller is the alignment, greater is the number of necessary DBATs.
818 On 8xx, large pages (512kb or 8M) are used to map kernel linear
819 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
820 in that case. If PIN_TLB is selected, it must be aligned to 8M as
821 8M pages will be pinned.
823 config FORCE_MAX_ZONEORDER
824 int "Maximum zone order"
825 range 8 9 if PPC64 && PPC_64K_PAGES
826 default "9" if PPC64 && PPC_64K_PAGES
827 range 13 13 if PPC64 && !PPC_64K_PAGES
828 default "13" if PPC64 && !PPC_64K_PAGES
829 range 9 64 if PPC32 && PPC_16K_PAGES
830 default "9" if PPC32 && PPC_16K_PAGES
831 range 7 64 if PPC32 && PPC_64K_PAGES
832 default "7" if PPC32 && PPC_64K_PAGES
833 range 5 64 if PPC32 && PPC_256K_PAGES
834 default "5" if PPC32 && PPC_256K_PAGES
838 The kernel memory allocator divides physically contiguous memory
839 blocks into "zones", where each zone is a power of two number of
840 pages. This option selects the largest power of two that the kernel
841 keeps in the memory allocator. If you need to allocate very large
842 blocks of physically contiguous memory, then you may need to
845 This config option is actually maximum order plus one. For example,
846 a value of 11 means that the largest free memory block is 2^10 pages.
848 The page size is not necessarily 4KB. For example, on 64-bit
849 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
850 this in mind when choosing a value for this option.
852 config PPC_SUBPAGE_PROT
853 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
855 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
857 This option adds support for system call to allow user programs
858 to set access permissions (read/write, readonly, or no access)
859 on the 4k subpages of each 64k page.
861 If unsure, say N here.
863 config PPC_PROT_SAO_LPAR
864 bool "Support PROT_SAO mappings in LPARs"
865 depends on PPC_BOOK3S_64
867 This option adds support for PROT_SAO mappings from userspace
868 inside LPARs on supported CPUs.
870 This may cause issues when performing guest migration from
871 a CPU that supports SAO to one that does not.
873 If unsure, say N here.
875 config PPC_COPRO_BASE
879 bool "SMT (Hyperthreading) scheduler support"
880 depends on PPC64 && SMP
882 SMT scheduler support improves the CPU scheduler's decision making
883 when dealing with POWER5 cpus at a cost of slightly increased
884 overhead in some places. If unsure say N here.
886 config PPC_DENORMALISATION
887 bool "PowerPC denormalisation exception handling"
888 depends on PPC_BOOK3S_64
889 default "y" if PPC_POWERNV
891 Add support for handling denormalisation of single precision
892 values. Useful for bare metal only. If unsure say Y here.
895 string "Initial kernel command string"
898 On some platforms, there is currently no way for the boot loader to
899 pass arguments to the kernel. For these platforms, you can supply
900 some command-line options at build time by entering them here. In
901 most cases you will need to specify the root device here.
904 prompt "Kernel command line type" if CMDLINE != ""
905 default CMDLINE_FROM_BOOTLOADER
907 config CMDLINE_FROM_BOOTLOADER
908 bool "Use bootloader kernel arguments if available"
910 Uses the command-line options passed by the boot loader. If
911 the boot loader doesn't provide any, the default kernel command
912 string provided in CMDLINE will be used.
914 config CMDLINE_EXTEND
915 bool "Extend bootloader kernel arguments"
917 The command-line arguments provided by the boot loader will be
918 appended to the default kernel command string.
921 bool "Always use the default kernel command string"
923 Always use the default kernel command string, even if the boot
924 loader passes other arguments to the kernel.
925 This is useful if you cannot or don't want to change the
926 command-line options your boot loader passes to the kernel.
931 string "Additional default image types"
933 List additional targets to be built by the bootwrapper here (separated
934 by spaces). This is useful for targets that depend of device tree
935 files in the .dts directory.
937 Targets in this list will be build as part of the default build
938 target, or when the user does a 'make zImage' or a
939 'make zImage.initrd'.
941 If unsure, leave blank
943 config ARCH_WANTS_FREEZER_CONTROL
947 source "kernel/power/Kconfig"
950 prompt "PowerPC Memory Protection Keys"
952 depends on PPC_BOOK3S_64
953 select ARCH_USES_HIGH_VMA_FLAGS
954 select ARCH_HAS_PKEYS
956 Memory Protection Keys provides a mechanism for enforcing
957 page-based protections, but without requiring modification of the
958 page tables when an application changes protection domains.
960 For details, see Documentation/core-api/protection-keys.rst
964 config PPC_SECURE_BOOT
965 prompt "Enable secure boot support"
967 depends on PPC_POWERNV || PPC_PSERIES
968 depends on IMA_ARCH_POLICY
969 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
971 Systems with firmware secure boot enabled need to define security
972 policies to extend secure boot to the OS. This config allows a user
973 to enable OS secure boot on systems that have firmware support for
974 it. If in doubt say N.
976 config PPC_SECVAR_SYSFS
977 bool "Enable sysfs interface for POWER secure variables"
979 depends on PPC_SECURE_BOOT
982 POWER secure variables are managed and controlled by firmware.
983 These variables are exposed to userspace via sysfs to enable
984 read/write operations on these variables. Say Y if you have
985 secure boot enabled and want to expose variables to userspace.
987 config PPC_RTAS_FILTER
988 bool "Enable filtering of RTAS syscalls"
992 The RTAS syscall API has security issues that could be used to
993 compromise system integrity. This option enforces restrictions on the
994 RTAS calls and arguments passed by userspace programs to mitigate
997 Say Y unless you know what you are doing and the filter is causing
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 "0xb0000000" if PPC_BOOK3S_32
1226 default "0xc0000000"
1230 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1233 default "0xc000000000000000"
1236 default "0xc000000000000000"
1237 config PHYSICAL_START
1239 default "0x00000000"
1245 config PPC_LIB_RHEAP
1248 source "arch/powerpc/kvm/Kconfig"
1250 source "kernel/livepatch/Kconfig"