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_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS
155 select ARCH_USE_QUEUED_SPINLOCKS if PPC_QUEUED_SPINLOCKS
156 select ARCH_WANT_IPC_PARSE_VERSION
157 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
158 select ARCH_WANT_LD_ORPHAN_WARN
159 select ARCH_WEAK_RELEASE_ACQUIRE
161 select BUILDTIME_TABLE_SORT
162 select CLONE_BACKWARDS
163 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
164 select DMA_OPS if PPC64
165 select DMA_OPS_BYPASS if PPC64
166 select ARCH_HAS_DMA_MAP_DIRECT if PPC64 && PPC_PSERIES
167 select DYNAMIC_FTRACE if FUNCTION_TRACER
168 select EDAC_ATOMIC_SCRUB
170 select GENERIC_ATOMIC64 if PPC32
171 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
172 select GENERIC_CMOS_UPDATE
173 select GENERIC_CPU_AUTOPROBE
174 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
175 select GENERIC_EARLY_IOREMAP
176 select GENERIC_GETTIMEOFDAY
177 select GENERIC_IRQ_SHOW
178 select GENERIC_IRQ_SHOW_LEVEL
179 select GENERIC_PCI_IOMAP if PCI
180 select GENERIC_SMP_IDLE_THREAD
181 select GENERIC_STRNCPY_FROM_USER
182 select GENERIC_STRNLEN_USER
183 select GENERIC_TIME_VSYSCALL
184 select GENERIC_VDSO_TIME_NS
185 select HAVE_ARCH_AUDITSYSCALL
186 select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
187 select HAVE_ARCH_JUMP_LABEL
188 select HAVE_ARCH_JUMP_LABEL_RELATIVE
189 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
190 select HAVE_ARCH_KASAN_VMALLOC if PPC32 && PPC_PAGE_SHIFT <= 14
191 select HAVE_ARCH_KGDB
192 select HAVE_ARCH_KFENCE if PPC32
193 select HAVE_ARCH_MMAP_RND_BITS
194 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
195 select HAVE_ARCH_NVRAM_OPS
196 select HAVE_ARCH_SECCOMP_FILTER
197 select HAVE_ARCH_TRACEHOOK
198 select HAVE_ASM_MODVERSIONS
199 select HAVE_C_RECORDMCOUNT
200 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
201 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
202 select HAVE_CONTEXT_TRACKING if PPC64
203 select HAVE_DEBUG_KMEMLEAK
204 select HAVE_DEBUG_STACKOVERFLOW
205 select HAVE_DYNAMIC_FTRACE
206 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
208 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
210 select HAVE_FTRACE_MCOUNT_RECORD
211 select HAVE_FUNCTION_ERROR_INJECTION
212 select HAVE_FUNCTION_GRAPH_TRACER
213 select HAVE_FUNCTION_TRACER
214 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
215 select HAVE_GENERIC_VDSO
216 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
218 select HAVE_IOREMAP_PROT
219 select HAVE_IRQ_EXIT_ON_IRQ_STACK
220 select HAVE_KERNEL_GZIP
221 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
222 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
223 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
225 select HAVE_KPROBES_ON_FTRACE
226 select HAVE_KRETPROBES
227 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
228 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
229 select HAVE_MOD_ARCH_SPECIFIC
230 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
231 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC64 && PPC_BOOK3S && SMP
232 select HAVE_OPTPROBES
233 select HAVE_PERF_EVENTS
234 select HAVE_PERF_EVENTS_NMI if PPC64
235 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
236 select HAVE_PERF_REGS
237 select HAVE_PERF_USER_STACK_DUMP
238 select MMU_GATHER_RCU_TABLE_FREE
239 select MMU_GATHER_PAGE_SIZE
240 select HAVE_REGS_AND_STACK_ACCESS_API
241 select HAVE_RELIABLE_STACKTRACE
242 select HAVE_SOFTIRQ_ON_OWN_STACK
243 select HAVE_SYSCALL_TRACEPOINTS
244 select HAVE_VIRT_CPU_ACCOUNTING
245 select HAVE_IRQ_TIME_ACCOUNTING
247 select IOMMU_HELPER if PPC64
249 select IRQ_FORCED_THREADING
250 select MODULES_USE_ELF_RELA
251 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
252 select NEED_SG_DMA_LENGTH
254 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
255 select OF_EARLY_FLATTREE
256 select OLD_SIGACTION if PPC32
257 select OLD_SIGSUSPEND
258 select PCI_DOMAINS if PCI
259 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
260 select PCI_SYSCALL if PCI
261 select PPC_DAWR if PPC64
264 select SYSCTL_EXCEPTION_TRACE
265 select THREAD_INFO_IN_TASK
266 select VIRT_TO_BUS if !PPC64
268 # Please keep this list sorted alphabetically.
271 config PPC_BARRIER_NOSPEC
274 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
285 bool "Enable support for 32bit binaries"
287 default y if !CPU_LITTLE_ENDIAN
288 select ARCH_WANT_OLD_COMPAT_IPC
289 select COMPAT_OLD_SIGACTION
291 config SYSVIPC_COMPAT
293 depends on COMPAT && SYSVIPC
296 config SCHED_OMIT_FRAME_POINTER
300 config ARCH_MAY_HAVE_PC_FDC
304 config PPC_UDBG_16550
307 config GENERIC_TBSYNC
309 default y if PPC32 && SMP
320 config GENERIC_BUG_RELATIVE_POINTERS
322 depends on GENERIC_BUG
324 config SYS_SUPPORTS_APM_EMULATION
325 default y if PMAC_APM_EMU
331 Used to allow a board to specify it wants an ePAPR compliant wrapper.
333 config DEFAULT_UIMAGE
336 Used to allow a board to specify it wants a uImage built by default
338 config ARCH_HIBERNATION_POSSIBLE
342 config ARCH_SUSPEND_POSSIBLE
344 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
345 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
348 config ARCH_SUSPEND_NONZERO_CPU
350 depends on PPC_POWERNV || PPC_PSERIES
352 config PPC_DCR_NATIVE
360 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
363 config PPC_OF_PLATFORM_PCI
366 depends on PPC64 # not supported on 32 bits yet
368 config ARCH_SUPPORTS_UPROBES
371 config PPC_ADV_DEBUG_REGS
373 depends on 40x || BOOKE
376 config PPC_ADV_DEBUG_IACS
378 depends on PPC_ADV_DEBUG_REGS
382 config PPC_ADV_DEBUG_DACS
384 depends on PPC_ADV_DEBUG_REGS
387 config PPC_ADV_DEBUG_DVCS
389 depends on PPC_ADV_DEBUG_REGS
393 config PPC_ADV_DEBUG_DAC_RANGE
395 depends on PPC_ADV_DEBUG_REGS && 44x
403 default y if PPC_BOOK3E_64
405 config PGTABLE_LEVELS
410 source "arch/powerpc/sysdev/Kconfig"
411 source "arch/powerpc/platforms/Kconfig"
413 menu "Kernel options"
416 bool "High memory support"
420 source "kernel/Kconfig.hz"
422 config HUGETLB_PAGE_SIZE_VARIABLE
424 depends on HUGETLB_PAGE && PPC_BOOK3S_64
427 config MATH_EMULATION
428 bool "Math emulation"
429 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
432 Some PowerPC chips designed for embedded applications do not have
433 a floating-point unit and therefore do not implement the
434 floating-point instructions in the PowerPC instruction set. If you
435 say Y here, the kernel will include code to emulate a floating-point
436 unit, which will allow programs that use floating-point
439 This is also useful to emulate missing (optional) instructions
440 such as fsqrt on cores that do have an FPU but do not implement
441 them (such as Freescale BookE).
444 prompt "Math emulation options"
445 default MATH_EMULATION_FULL
446 depends on MATH_EMULATION
448 config MATH_EMULATION_FULL
449 bool "Emulate all the floating point instructions"
451 Select this option will enable the kernel to support to emulate
452 all the floating point instructions. If your SoC doesn't have
453 a FPU, you should select this.
455 config MATH_EMULATION_HW_UNIMPLEMENTED
456 bool "Just emulate the FPU unimplemented instructions"
458 Select this if you know there does have a hardware FPU on your
459 SoC, but some floating point instructions are not implemented by that.
463 config PPC_TRANSACTIONAL_MEM
464 bool "Transactional Memory support for POWERPC"
465 depends on PPC_BOOK3S_64
470 Support user-mode Transactional Memory on POWERPC.
473 bool "Ultravisor support"
474 depends on KVM_BOOK3S_HV_POSSIBLE
475 depends on DEVICE_PRIVATE
478 This option paravirtualizes the kernel to run in POWER platforms that
479 supports the Protected Execution Facility (PEF). On such platforms,
480 the ultravisor firmware runs at a privilege level above the
485 config LD_HEAD_STUB_CATCH
486 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
489 Very large kernels can cause linker branch stubs to be generated by
490 code in head_64.S, which moves the head text sections out of their
491 specified location. This option can work around the problem.
495 config MPROFILE_KERNEL
496 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
497 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
500 bool "Support for enabling/disabling CPUs"
501 depends on SMP && (PPC_PSERIES || \
502 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
504 Say Y here to be able to disable and re-enable individual
505 CPUs at runtime on SMP machines.
507 Say N if you are unsure.
509 config PPC_QUEUED_SPINLOCKS
510 bool "Queued spinlocks" if EXPERT
512 default PPC_BOOK3S_64
514 Say Y here to use queued spinlocks which give better scalability and
515 fairness on large SMP and NUMA systems without harming single threaded
518 config ARCH_CPU_PROBE_RELEASE
520 depends on HOTPLUG_CPU
522 config ARCH_ENABLE_MEMORY_HOTPLUG
525 config ARCH_ENABLE_MEMORY_HOTREMOVE
528 config PPC64_SUPPORTS_MEMORY_FAILURE
529 bool "Add support for memory hwpoison"
530 depends on PPC_BOOK3S_64
531 default "y" if PPC_POWERNV
532 select ARCH_SUPPORTS_MEMORY_FAILURE
535 bool "kexec system call"
536 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
539 kexec is a system call that implements the ability to shutdown your
540 current kernel, and to start another kernel. It is like a reboot
541 but it is independent of the system firmware. And like a reboot
542 you can start any kernel with it, not just Linux.
544 The name comes from the similarity to the exec system call.
546 It is an ongoing process to be certain the hardware in a machine
547 is properly shutdown, so do not be surprised if this code does not
548 initially work for you. As of this writing the exact hardware
549 interface is strongly in flux, so no good recommendation can be
553 bool "kexec file based system call"
555 select HAVE_IMA_KEXEC if IMA
560 depends on CRYPTO_SHA256=y
562 This is a new version of the kexec system call. This call is
563 file based and takes in file descriptors as system call arguments
564 for kernel and initramfs as opposed to a list of segments as is the
565 case for the older kexec call.
567 config ARCH_HAS_KEXEC_PURGATORY
571 bool "Build a relocatable kernel"
572 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
573 select NONSTATIC_KERNEL
574 select MODULE_REL_CRCS if MODVERSIONS
576 This builds a kernel image that is capable of running at the
577 location the kernel is loaded at. For ppc32, there is no any
578 alignment restrictions, and this feature is a superset of
579 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
580 16k-aligned base address. The kernel is linked as a
581 position-independent executable (PIE) and contains dynamic relocations
582 which are processed early in the bootup process.
584 One use is for the kexec on panic case where the recovery kernel
585 must live at a different physical address than the primary
588 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
589 it has been loaded at and the compile time physical addresses
590 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
591 setting can still be useful to bootwrappers that need to know the
592 load address of the kernel (eg. u-boot/mkimage).
594 config RANDOMIZE_BASE
595 bool "Randomize the address of the kernel image"
596 depends on (FSL_BOOKE && FLATMEM && PPC32)
597 depends on RELOCATABLE
599 Randomizes the virtual address at which the kernel image is
600 loaded, as a security feature that deters exploit attempts
601 relying on knowledge of the location of kernel internals.
605 config RELOCATABLE_TEST
606 bool "Test relocatable kernel"
607 depends on (PPC64 && RELOCATABLE)
609 This runs the relocatable kernel at the address it was initially
610 loaded at, which tends to be non-zero and therefore test the
614 bool "Build a dump capture kernel"
615 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
616 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
618 Build a kernel suitable for use as a dump capture kernel.
619 The same kernel binary can be used as production kernel and dump
623 bool "Firmware-assisted dump"
624 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
628 A robust mechanism to get reliable kernel crash dump with
629 assistance from firmware. This approach does not use kexec,
630 instead firmware assists in booting the capture kernel
631 while preserving memory contents. Firmware-assisted dump
632 is meant to be a kdump replacement offering robustness and
633 speed not possible without system firmware assistance.
635 If unsure, say "y". Only special kernels like petitboot may
636 need to say "N" here.
638 config PRESERVE_FA_DUMP
639 bool "Preserve Firmware-assisted dump"
640 depends on PPC64 && PPC_POWERNV && !FA_DUMP
642 On a kernel with FA_DUMP disabled, this option helps to preserve
643 crash data from a previously crash'ed kernel. Useful when the next
644 memory preserving kernel boot would process this crash data.
645 Petitboot kernel is the typical usecase for this option.
648 bool "Export OPAL memory as /sys/firmware/opal/core"
649 depends on PPC64 && PPC_POWERNV
651 This option uses the MPIPL support in firmware to provide an
652 ELF core of OPAL memory after a crash. The ELF core is exported
653 as /sys/firmware/opal/core file which is helpful in debugging
654 OPAL crashes using GDB.
657 bool "Distribute interrupts on all CPUs by default"
660 This option gives the kernel permission to distribute IRQs across
661 multiple CPUs. Saying N here will route all IRQs to the first
662 CPU. Generally saying Y is safe, although some problems have been
663 reported with SMP Power Macintoshes with this option enabled.
666 bool "NUMA Memory Allocation and Scheduler Support"
667 depends on PPC64 && SMP
668 default y if PPC_PSERIES || PPC_POWERNV
670 Enable NUMA (Non-Uniform Memory Access) support.
672 The kernel will try to allocate memory used by a CPU on the
673 local memory controller of the CPU and add some more
674 NUMA awareness to the kernel.
680 depends on NEED_MULTIPLE_NODES
682 config USE_PERCPU_NUMA_NODE_ID
686 config HAVE_MEMORYLESS_NODES
690 config ARCH_SELECT_MEMORY_MODEL
694 config ARCH_FLATMEM_ENABLE
696 depends on (PPC64 && !NUMA) || PPC32
698 config ARCH_SPARSEMEM_ENABLE
701 select SPARSEMEM_VMEMMAP_ENABLE
703 config ARCH_SPARSEMEM_DEFAULT
705 depends on PPC_BOOK3S_64
707 config SYS_SUPPORTS_HUGETLBFS
710 config ILLEGAL_POINTER_VALUE
712 # This is roughly half way between the top of user space and the bottom
713 # of kernel space, which seems about as good as we can get.
714 default 0x5deadbeef0000000 if PPC64
717 config ARCH_MEMORY_PROBE
719 depends on MEMORY_HOTPLUG
725 Select the kernel logical page size. Increasing the page size
726 will reduce software overhead at each page boundary, allow
727 hardware prefetch mechanisms to be more effective, and allow
728 larger dma transfers increasing IO efficiency and reducing
729 overhead. However the utilization of memory will increase.
730 For example, each cached file will using a multiple of the
731 page size to hold its contents and the difference between the
732 end of file and the end of page is wasted.
734 Some dedicated systems, such as software raid serving with
735 accelerated calculations, have shown significant increases.
737 If you configure a 64 bit kernel for 64k pages but the
738 processor does not support them, then the kernel will simulate
739 them with 4k pages, loading them on demand, but with the
740 reduced software overhead and larger internal fragmentation.
741 For the 32 bit kernel, a large page option will not be offered
742 unless it is supported by the configured processor.
744 If unsure, choose 4K_PAGES.
748 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
752 depends on 44x || PPC_8xx
756 depends on 44x || PPC_BOOK3S_64
757 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
759 config PPC_256K_PAGES
760 bool "256k page size (Requires non-standard binutils settings)"
761 depends on 44x && !PPC_47x
763 Make the page size 256k.
765 The kernel will only be able to run applications that have been
766 compiled with '-zmax-page-size' set to 256K (the default is 64K) using
767 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
768 definition from 0x10000 to 0x40000 in older versions.
772 config PPC_PAGE_SHIFT
774 default 18 if PPC_256K_PAGES
775 default 16 if PPC_64K_PAGES
776 default 14 if PPC_16K_PAGES
780 int "Thread shift" if EXPERT
782 default "15" if PPC_256K_PAGES
783 default "14" if PPC64
784 default "14" if KASAN
787 Used to define the stack size. The default is almost always what you
788 want. Only change this if you know what you are doing.
790 config DATA_SHIFT_BOOL
791 bool "Set custom data alignment"
792 depends on ADVANCED_OPTIONS
793 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE
794 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX)
796 This option allows you to set the kernel data alignment. When
797 RAM is mapped by blocks, the alignment needs to fit the size and
798 number of possible blocks. The default should be OK for most configs.
800 Say N here unless you know what you are doing.
803 int "Data shift" if DATA_SHIFT_BOOL
804 default 24 if STRICT_KERNEL_RWX && PPC64
805 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
806 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
807 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
808 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
809 default 23 if STRICT_KERNEL_RWX && PPC_8xx
810 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA
811 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
812 default PPC_PAGE_SHIFT
814 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
815 Smaller is the alignment, greater is the number of necessary DBATs.
817 On 8xx, large pages (512kb or 8M) are used to map kernel linear
818 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
819 in that case. If PIN_TLB is selected, it must be aligned to 8M as
820 8M pages will be pinned.
822 config FORCE_MAX_ZONEORDER
823 int "Maximum zone order"
824 range 8 9 if PPC64 && PPC_64K_PAGES
825 default "9" if PPC64 && PPC_64K_PAGES
826 range 13 13 if PPC64 && !PPC_64K_PAGES
827 default "13" if PPC64 && !PPC_64K_PAGES
828 range 9 64 if PPC32 && PPC_16K_PAGES
829 default "9" if PPC32 && PPC_16K_PAGES
830 range 7 64 if PPC32 && PPC_64K_PAGES
831 default "7" if PPC32 && PPC_64K_PAGES
832 range 5 64 if PPC32 && PPC_256K_PAGES
833 default "5" if PPC32 && PPC_256K_PAGES
837 The kernel memory allocator divides physically contiguous memory
838 blocks into "zones", where each zone is a power of two number of
839 pages. This option selects the largest power of two that the kernel
840 keeps in the memory allocator. If you need to allocate very large
841 blocks of physically contiguous memory, then you may need to
844 This config option is actually maximum order plus one. For example,
845 a value of 11 means that the largest free memory block is 2^10 pages.
847 The page size is not necessarily 4KB. For example, on 64-bit
848 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
849 this in mind when choosing a value for this option.
851 config PPC_SUBPAGE_PROT
852 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
854 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
856 This option adds support for system call to allow user programs
857 to set access permissions (read/write, readonly, or no access)
858 on the 4k subpages of each 64k page.
860 If unsure, say N here.
862 config PPC_PROT_SAO_LPAR
863 bool "Support PROT_SAO mappings in LPARs"
864 depends on PPC_BOOK3S_64
866 This option adds support for PROT_SAO mappings from userspace
867 inside LPARs on supported CPUs.
869 This may cause issues when performing guest migration from
870 a CPU that supports SAO to one that does not.
872 If unsure, say N here.
874 config PPC_COPRO_BASE
878 bool "SMT (Hyperthreading) scheduler support"
879 depends on PPC64 && SMP
881 SMT scheduler support improves the CPU scheduler's decision making
882 when dealing with POWER5 cpus at a cost of slightly increased
883 overhead in some places. If unsure say N here.
885 config PPC_DENORMALISATION
886 bool "PowerPC denormalisation exception handling"
887 depends on PPC_BOOK3S_64
888 default "y" if PPC_POWERNV
890 Add support for handling denormalisation of single precision
891 values. Useful for bare metal only. If unsure say Y here.
894 string "Initial kernel command string"
897 On some platforms, there is currently no way for the boot loader to
898 pass arguments to the kernel. For these platforms, you can supply
899 some command-line options at build time by entering them here. In
900 most cases you will need to specify the root device here.
903 prompt "Kernel command line type" if CMDLINE != ""
904 default CMDLINE_FROM_BOOTLOADER
906 config CMDLINE_FROM_BOOTLOADER
907 bool "Use bootloader kernel arguments if available"
909 Uses the command-line options passed by the boot loader. If
910 the boot loader doesn't provide any, the default kernel command
911 string provided in CMDLINE will be used.
913 config CMDLINE_EXTEND
914 bool "Extend bootloader kernel arguments"
916 The command-line arguments provided by the boot loader will be
917 appended to the default kernel command string.
920 bool "Always use the default kernel command string"
922 Always use the default kernel command string, even if the boot
923 loader passes other arguments to the kernel.
924 This is useful if you cannot or don't want to change the
925 command-line options your boot loader passes to the kernel.
930 string "Additional default image types"
932 List additional targets to be built by the bootwrapper here (separated
933 by spaces). This is useful for targets that depend of device tree
934 files in the .dts directory.
936 Targets in this list will be build as part of the default build
937 target, or when the user does a 'make zImage' or a
938 'make zImage.initrd'.
940 If unsure, leave blank
942 config ARCH_WANTS_FREEZER_CONTROL
946 source "kernel/power/Kconfig"
949 prompt "PowerPC Memory Protection Keys"
951 depends on PPC_BOOK3S_64
952 select ARCH_USES_HIGH_VMA_FLAGS
953 select ARCH_HAS_PKEYS
955 Memory Protection Keys provides a mechanism for enforcing
956 page-based protections, but without requiring modification of the
957 page tables when an application changes protection domains.
959 For details, see Documentation/core-api/protection-keys.rst
963 config PPC_SECURE_BOOT
964 prompt "Enable secure boot support"
966 depends on PPC_POWERNV || PPC_PSERIES
967 depends on IMA_ARCH_POLICY
968 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
970 Systems with firmware secure boot enabled need to define security
971 policies to extend secure boot to the OS. This config allows a user
972 to enable OS secure boot on systems that have firmware support for
973 it. If in doubt say N.
975 config PPC_SECVAR_SYSFS
976 bool "Enable sysfs interface for POWER secure variables"
978 depends on PPC_SECURE_BOOT
981 POWER secure variables are managed and controlled by firmware.
982 These variables are exposed to userspace via sysfs to enable
983 read/write operations on these variables. Say Y if you have
984 secure boot enabled and want to expose variables to userspace.
986 config PPC_RTAS_FILTER
987 bool "Enable filtering of RTAS syscalls"
991 The RTAS syscall API has security issues that could be used to
992 compromise system integrity. This option enforces restrictions on the
993 RTAS calls and arguments passed by userspace programs to mitigate
996 Say Y unless you know what you are doing and the filter is causing
1008 bool "Support for ISA-bus hardware"
1012 Find out whether you have ISA slots on your motherboard. ISA is the
1013 name of a bus system, i.e. the way the CPU talks to the other stuff
1014 inside your box. If you have an Apple machine, say N here; if you
1015 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1016 embedded board, consult your board documentation.
1018 config GENERIC_ISA_DMA
1020 depends on ISA_DMA_API
1023 config PPC_INDIRECT_PCI
1026 default y if 40x || 44x
1036 select ARCH_HAS_DMA_SET_MASK
1037 select PPC_INDIRECT_PCI
1043 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1045 Freescale MPC85xx/MPC86xx power management controller support
1046 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1051 depends on SUSPEND && (44x || 40x)
1053 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1054 It also enables support for two different idle states (idle-wait
1061 bool "Freescale Local Bus support"
1063 Enables reporting of errors from the Freescale local bus
1064 controller. Also contains some common code used by
1065 drivers for specific local bus peripherals.
1069 depends on PPC_83xx || QUICC_ENGINE || CPM2
1071 Freescale General-purpose Timers support
1075 depends on PCI && 8260
1076 select PPC_INDIRECT_PCI
1080 bool "Freescale Embedded SRIO Controller support"
1081 depends on RAPIDIO = y && HAVE_RAPIDIO
1084 Include support for RapidIO controller on Freescale embedded
1085 processors (MPC8548, MPC8641, etc).
1089 config NONSTATIC_KERNEL
1092 menu "Advanced setup"
1095 config ADVANCED_OPTIONS
1096 bool "Prompt for advanced kernel configuration options"
1098 This option will enable prompting for a variety of advanced kernel
1099 configuration options. These options can cause the kernel to not
1100 work if they are set incorrectly, but can be used to optimize certain
1101 aspects of kernel memory management.
1103 Unless you know what you are doing, say N here.
1105 comment "Default settings for advanced configuration options are used"
1106 depends on !ADVANCED_OPTIONS
1108 config LOWMEM_SIZE_BOOL
1109 bool "Set maximum low memory"
1110 depends on ADVANCED_OPTIONS
1112 This option allows you to set the maximum amount of memory which
1113 will be used as "low memory", that is, memory which the kernel can
1114 access directly, without having to set up a kernel virtual mapping.
1115 This can be useful in optimizing the layout of kernel virtual
1118 Say N here unless you know what you are doing.
1121 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1122 default "0x30000000"
1124 config LOWMEM_CAM_NUM_BOOL
1125 bool "Set number of CAMs to use to map low memory"
1126 depends on ADVANCED_OPTIONS && FSL_BOOKE
1128 This option allows you to set the maximum number of CAM slots that
1129 will be used to map low memory. There are a limited number of slots
1130 available and even more limited number that will fit in the L1 MMU.
1131 However, using more entries will allow mapping more low memory. This
1132 can be useful in optimizing the layout of kernel virtual memory.
1134 Say N here unless you know what you are doing.
1136 config LOWMEM_CAM_NUM
1137 depends on FSL_BOOKE
1138 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1141 config DYNAMIC_MEMSTART
1142 bool "Enable page aligned dynamic load address for kernel"
1143 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1144 select NONSTATIC_KERNEL
1146 This option enables the kernel to be loaded at any page aligned
1147 physical address. The kernel creates a mapping from KERNELBASE to
1148 the address where the kernel is loaded. The page size here implies
1149 the TLB page size of the mapping for kernel on the particular platform.
1150 Please refer to the init code for finding the TLB page size.
1152 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1153 kernel image, where the only restriction is the page aligned kernel
1154 load address. When this option is enabled, the compile time physical
1155 address CONFIG_PHYSICAL_START is ignored.
1157 This option is overridden by CONFIG_RELOCATABLE
1159 config PAGE_OFFSET_BOOL
1160 bool "Set custom page offset address"
1161 depends on ADVANCED_OPTIONS
1163 This option allows you to set the kernel virtual address at which
1164 the kernel will map low memory. This can be useful in optimizing
1165 the virtual memory layout of the system.
1167 Say N here unless you know what you are doing.
1170 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1171 default "0xc0000000"
1173 config KERNEL_START_BOOL
1174 bool "Set custom kernel base address"
1175 depends on ADVANCED_OPTIONS
1177 This option allows you to set the kernel virtual address at which
1178 the kernel will be loaded. Normally this should match PAGE_OFFSET
1179 however there are times (like kdump) that one might not want them
1182 Say N here unless you know what you are doing.
1185 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1186 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1187 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1188 default "0xc0000000"
1190 config PHYSICAL_START_BOOL
1191 bool "Set physical address where the kernel is loaded"
1192 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1194 This gives the physical address where the kernel is loaded.
1196 Say N here unless you know what you are doing.
1198 config PHYSICAL_START
1199 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1200 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1201 default "0x00000000"
1203 config PHYSICAL_ALIGN
1205 default "0x04000000" if FSL_BOOKE
1207 This value puts the alignment restrictions on physical address
1208 where kernel is loaded and run from. Kernel is compiled for an
1209 address which meets above alignment restriction.
1211 config TASK_SIZE_BOOL
1212 bool "Set custom user task size"
1213 depends on ADVANCED_OPTIONS
1215 This option allows you to set the amount of virtual address space
1216 allocated to user tasks. This can be useful in optimizing the
1217 virtual memory layout of the system.
1219 Say N here unless you know what you are doing.
1222 hex "Size of user task space" if TASK_SIZE_BOOL
1223 default "0x80000000" if PPC_8xx
1224 default "0xb0000000" if PPC_BOOK3S_32
1225 default "0xc0000000"
1229 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1232 default "0xc000000000000000"
1235 default "0xc000000000000000"
1236 config PHYSICAL_START
1238 default "0x00000000"
1244 config PPC_LIB_RHEAP
1247 source "arch/powerpc/kvm/Kconfig"
1249 source "kernel/livepatch/Kconfig"