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_ENABLE_MEMORY_HOTPLUG
122 select ARCH_ENABLE_MEMORY_HOTREMOVE
123 select ARCH_HAS_COPY_MC if PPC64
124 select ARCH_HAS_DEBUG_VIRTUAL
125 select ARCH_HAS_DEBUG_VM_PGTABLE
126 select ARCH_HAS_DEVMEM_IS_ALLOWED
127 select ARCH_HAS_DMA_MAP_DIRECT if PPC_PSERIES
128 select ARCH_HAS_ELF_RANDOMIZE
129 select ARCH_HAS_FORTIFY_SOURCE
130 select ARCH_HAS_GCOV_PROFILE_ALL
131 select ARCH_HAS_HUGEPD if HUGETLB_PAGE
133 select ARCH_HAS_MEMBARRIER_CALLBACKS
134 select ARCH_HAS_MEMBARRIER_SYNC_CORE
135 select ARCH_HAS_MEMREMAP_COMPAT_ALIGN
136 select ARCH_HAS_MMIOWB if PPC64
137 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
138 select ARCH_HAS_PHYS_TO_DMA
139 select ARCH_HAS_PMEM_API
140 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
141 select ARCH_HAS_PTE_SPECIAL
142 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
143 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !HIBERNATION)
144 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
145 select ARCH_HAS_UACCESS_FLUSHCACHE
146 select ARCH_HAS_UBSAN_SANITIZE_ALL
147 select ARCH_HAVE_NMI_SAFE_CMPXCHG
148 select ARCH_KEEP_MEMBLOCK
149 select ARCH_MIGHT_HAVE_PC_PARPORT
150 select ARCH_MIGHT_HAVE_PC_SERIO
151 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
152 select ARCH_STACKWALK
153 select ARCH_SUPPORTS_ATOMIC_RMW
154 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC32 || PPC_BOOK3S_64
155 select ARCH_USE_BUILTIN_BSWAP
156 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
157 select ARCH_USE_MEMTEST
158 select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS
159 select ARCH_USE_QUEUED_SPINLOCKS if PPC_QUEUED_SPINLOCKS
160 select ARCH_WANT_IPC_PARSE_VERSION
161 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
162 select ARCH_WANT_LD_ORPHAN_WARN
163 select ARCH_WEAK_RELEASE_ACQUIRE
165 select BUILDTIME_TABLE_SORT
166 select CLONE_BACKWARDS
167 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
168 select DMA_OPS_BYPASS if PPC64
169 select DMA_OPS if PPC64
170 select DYNAMIC_FTRACE if FUNCTION_TRACER
171 select EDAC_ATOMIC_SCRUB
173 select GENERIC_ATOMIC64 if PPC32
174 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
175 select GENERIC_CMOS_UPDATE
176 select GENERIC_CPU_AUTOPROBE
177 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
178 select GENERIC_EARLY_IOREMAP
179 select GENERIC_GETTIMEOFDAY
180 select GENERIC_IRQ_SHOW
181 select GENERIC_IRQ_SHOW_LEVEL
182 select GENERIC_PCI_IOMAP if PCI
183 select GENERIC_SMP_IDLE_THREAD
184 select GENERIC_STRNCPY_FROM_USER
185 select GENERIC_STRNLEN_USER
186 select GENERIC_TIME_VSYSCALL
187 select GENERIC_VDSO_TIME_NS
188 select HAVE_ARCH_AUDITSYSCALL
189 select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP
190 select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
191 select HAVE_ARCH_JUMP_LABEL
192 select HAVE_ARCH_JUMP_LABEL_RELATIVE
193 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
194 select HAVE_ARCH_KASAN_VMALLOC if PPC32 && PPC_PAGE_SHIFT <= 14
195 select HAVE_ARCH_KFENCE if PPC32
196 select HAVE_ARCH_KGDB
197 select HAVE_ARCH_MMAP_RND_BITS
198 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
199 select HAVE_ARCH_NVRAM_OPS
200 select HAVE_ARCH_SECCOMP_FILTER
201 select HAVE_ARCH_TRACEHOOK
202 select HAVE_ASM_MODVERSIONS
203 select HAVE_CONTEXT_TRACKING if PPC64
204 select HAVE_C_RECORDMCOUNT
205 select HAVE_DEBUG_KMEMLEAK
206 select HAVE_DEBUG_STACKOVERFLOW
207 select HAVE_DYNAMIC_FTRACE
208 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
210 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
212 select HAVE_FTRACE_MCOUNT_RECORD
213 select HAVE_FUNCTION_ERROR_INJECTION
214 select HAVE_FUNCTION_GRAPH_TRACER
215 select HAVE_FUNCTION_TRACER
216 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
217 select HAVE_GENERIC_VDSO
218 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC_BOOK3S_64 && SMP
219 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
220 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
222 select HAVE_IOREMAP_PROT
223 select HAVE_IRQ_EXIT_ON_IRQ_STACK
224 select HAVE_IRQ_TIME_ACCOUNTING
225 select HAVE_KERNEL_GZIP
226 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
227 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
228 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
230 select HAVE_KPROBES_ON_FTRACE
231 select HAVE_KRETPROBES
232 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
233 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
234 select HAVE_MOD_ARCH_SPECIFIC
235 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
236 select HAVE_OPTPROBES
237 select HAVE_PERF_EVENTS
238 select HAVE_PERF_EVENTS_NMI if PPC64
239 select HAVE_PERF_REGS
240 select HAVE_PERF_USER_STACK_DUMP
241 select HAVE_REGS_AND_STACK_ACCESS_API
242 select HAVE_RELIABLE_STACKTRACE
244 select HAVE_SOFTIRQ_ON_OWN_STACK
245 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
246 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
247 select HAVE_SYSCALL_TRACEPOINTS
248 select HAVE_VIRT_CPU_ACCOUNTING
249 select HUGETLB_PAGE_SIZE_VARIABLE if PPC_BOOK3S_64 && HUGETLB_PAGE
250 select IOMMU_HELPER if PPC64
252 select IRQ_FORCED_THREADING
253 select MMU_GATHER_PAGE_SIZE
254 select MMU_GATHER_RCU_TABLE_FREE
255 select MODULES_USE_ELF_RELA
256 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
257 select NEED_SG_DMA_LENGTH
259 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
260 select OF_EARLY_FLATTREE
261 select OLD_SIGACTION if PPC32
262 select OLD_SIGSUSPEND
263 select PCI_DOMAINS if PCI
264 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
265 select PCI_SYSCALL if PCI
266 select PPC_DAWR if PPC64
269 select SYSCTL_EXCEPTION_TRACE
270 select THREAD_INFO_IN_TASK
271 select VIRT_TO_BUS if !PPC64
273 # Please keep this list sorted alphabetically.
276 config PPC_BARRIER_NOSPEC
279 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
290 bool "Enable support for 32bit binaries"
292 default y if !CPU_LITTLE_ENDIAN
293 select ARCH_WANT_OLD_COMPAT_IPC
294 select COMPAT_OLD_SIGACTION
296 config SYSVIPC_COMPAT
298 depends on COMPAT && SYSVIPC
301 config SCHED_OMIT_FRAME_POINTER
305 config ARCH_MAY_HAVE_PC_FDC
309 config PPC_UDBG_16550
312 config GENERIC_TBSYNC
314 default y if PPC32 && SMP
325 config GENERIC_BUG_RELATIVE_POINTERS
327 depends on GENERIC_BUG
329 config SYS_SUPPORTS_APM_EMULATION
330 default y if PMAC_APM_EMU
336 Used to allow a board to specify it wants an ePAPR compliant wrapper.
338 config DEFAULT_UIMAGE
341 Used to allow a board to specify it wants a uImage built by default
343 config ARCH_HIBERNATION_POSSIBLE
347 config ARCH_SUSPEND_POSSIBLE
349 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
350 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
353 config ARCH_SUSPEND_NONZERO_CPU
355 depends on PPC_POWERNV || PPC_PSERIES
357 config PPC_DCR_NATIVE
365 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
368 config PPC_OF_PLATFORM_PCI
371 depends on PPC64 # not supported on 32 bits yet
373 config ARCH_SUPPORTS_UPROBES
376 config PPC_ADV_DEBUG_REGS
378 depends on 40x || BOOKE
381 config PPC_ADV_DEBUG_IACS
383 depends on PPC_ADV_DEBUG_REGS
387 config PPC_ADV_DEBUG_DACS
389 depends on PPC_ADV_DEBUG_REGS
392 config PPC_ADV_DEBUG_DVCS
394 depends on PPC_ADV_DEBUG_REGS
398 config PPC_ADV_DEBUG_DAC_RANGE
400 depends on PPC_ADV_DEBUG_REGS && 44x
408 default y if PPC_BOOK3E_64
410 config PGTABLE_LEVELS
415 source "arch/powerpc/sysdev/Kconfig"
416 source "arch/powerpc/platforms/Kconfig"
418 menu "Kernel options"
421 bool "High memory support"
425 source "kernel/Kconfig.hz"
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 PPC64_SUPPORTS_MEMORY_FAILURE
523 bool "Add support for memory hwpoison"
524 depends on PPC_BOOK3S_64
525 default "y" if PPC_POWERNV
526 select ARCH_SUPPORTS_MEMORY_FAILURE
529 bool "kexec system call"
530 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
533 kexec is a system call that implements the ability to shutdown your
534 current kernel, and to start another kernel. It is like a reboot
535 but it is independent of the system firmware. And like a reboot
536 you can start any kernel with it, not just Linux.
538 The name comes from the similarity to the exec system call.
540 It is an ongoing process to be certain the hardware in a machine
541 is properly shutdown, so do not be surprised if this code does not
542 initially work for you. As of this writing the exact hardware
543 interface is strongly in flux, so no good recommendation can be
547 bool "kexec file based system call"
549 select HAVE_IMA_KEXEC if IMA
554 depends on CRYPTO_SHA256=y
556 This is a new version of the kexec system call. This call is
557 file based and takes in file descriptors as system call arguments
558 for kernel and initramfs as opposed to a list of segments as is the
559 case for the older kexec call.
561 config ARCH_HAS_KEXEC_PURGATORY
565 bool "Build a relocatable kernel"
566 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
567 select NONSTATIC_KERNEL
568 select MODULE_REL_CRCS if MODVERSIONS
570 This builds a kernel image that is capable of running at the
571 location the kernel is loaded at. For ppc32, there is no any
572 alignment restrictions, and this feature is a superset of
573 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
574 16k-aligned base address. The kernel is linked as a
575 position-independent executable (PIE) and contains dynamic relocations
576 which are processed early in the bootup process.
578 One use is for the kexec on panic case where the recovery kernel
579 must live at a different physical address than the primary
582 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
583 it has been loaded at and the compile time physical addresses
584 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
585 setting can still be useful to bootwrappers that need to know the
586 load address of the kernel (eg. u-boot/mkimage).
588 config RANDOMIZE_BASE
589 bool "Randomize the address of the kernel image"
590 depends on (FSL_BOOKE && FLATMEM && PPC32)
591 depends on RELOCATABLE
593 Randomizes the virtual address at which the kernel image is
594 loaded, as a security feature that deters exploit attempts
595 relying on knowledge of the location of kernel internals.
599 config RELOCATABLE_TEST
600 bool "Test relocatable kernel"
601 depends on (PPC64 && RELOCATABLE)
603 This runs the relocatable kernel at the address it was initially
604 loaded at, which tends to be non-zero and therefore test the
608 bool "Build a dump capture kernel"
609 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
610 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
612 Build a kernel suitable for use as a dump capture kernel.
613 The same kernel binary can be used as production kernel and dump
617 bool "Firmware-assisted dump"
618 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
622 A robust mechanism to get reliable kernel crash dump with
623 assistance from firmware. This approach does not use kexec,
624 instead firmware assists in booting the capture kernel
625 while preserving memory contents. Firmware-assisted dump
626 is meant to be a kdump replacement offering robustness and
627 speed not possible without system firmware assistance.
629 If unsure, say "y". Only special kernels like petitboot may
630 need to say "N" here.
632 config PRESERVE_FA_DUMP
633 bool "Preserve Firmware-assisted dump"
634 depends on PPC64 && PPC_POWERNV && !FA_DUMP
636 On a kernel with FA_DUMP disabled, this option helps to preserve
637 crash data from a previously crash'ed kernel. Useful when the next
638 memory preserving kernel boot would process this crash data.
639 Petitboot kernel is the typical usecase for this option.
642 bool "Export OPAL memory as /sys/firmware/opal/core"
643 depends on PPC64 && PPC_POWERNV
645 This option uses the MPIPL support in firmware to provide an
646 ELF core of OPAL memory after a crash. The ELF core is exported
647 as /sys/firmware/opal/core file which is helpful in debugging
648 OPAL crashes using GDB.
651 bool "Distribute interrupts on all CPUs by default"
654 This option gives the kernel permission to distribute IRQs across
655 multiple CPUs. Saying N here will route all IRQs to the first
656 CPU. Generally saying Y is safe, although some problems have been
657 reported with SMP Power Macintoshes with this option enabled.
660 bool "NUMA Memory Allocation and Scheduler Support"
661 depends on PPC64 && SMP
662 default y if PPC_PSERIES || PPC_POWERNV
664 Enable NUMA (Non-Uniform Memory Access) support.
666 The kernel will try to allocate memory used by a CPU on the
667 local memory controller of the CPU and add some more
668 NUMA awareness to the kernel.
674 depends on NEED_MULTIPLE_NODES
676 config USE_PERCPU_NUMA_NODE_ID
680 config HAVE_MEMORYLESS_NODES
684 config ARCH_SELECT_MEMORY_MODEL
688 config ARCH_FLATMEM_ENABLE
690 depends on (PPC64 && !NUMA) || PPC32
692 config ARCH_SPARSEMEM_ENABLE
695 select SPARSEMEM_VMEMMAP_ENABLE
697 config ARCH_SPARSEMEM_DEFAULT
699 depends on PPC_BOOK3S_64
701 config ILLEGAL_POINTER_VALUE
703 # This is roughly half way between the top of user space and the bottom
704 # of kernel space, which seems about as good as we can get.
705 default 0x5deadbeef0000000 if PPC64
708 config ARCH_MEMORY_PROBE
710 depends on MEMORY_HOTPLUG
716 Select the kernel logical page size. Increasing the page size
717 will reduce software overhead at each page boundary, allow
718 hardware prefetch mechanisms to be more effective, and allow
719 larger dma transfers increasing IO efficiency and reducing
720 overhead. However the utilization of memory will increase.
721 For example, each cached file will using a multiple of the
722 page size to hold its contents and the difference between the
723 end of file and the end of page is wasted.
725 Some dedicated systems, such as software raid serving with
726 accelerated calculations, have shown significant increases.
728 If you configure a 64 bit kernel for 64k pages but the
729 processor does not support them, then the kernel will simulate
730 them with 4k pages, loading them on demand, but with the
731 reduced software overhead and larger internal fragmentation.
732 For the 32 bit kernel, a large page option will not be offered
733 unless it is supported by the configured processor.
735 If unsure, choose 4K_PAGES.
739 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
743 depends on 44x || PPC_8xx
747 depends on 44x || PPC_BOOK3S_64
748 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
750 config PPC_256K_PAGES
751 bool "256k page size (Requires non-standard binutils settings)"
752 depends on 44x && !PPC_47x
754 Make the page size 256k.
756 The kernel will only be able to run applications that have been
757 compiled with '-zmax-page-size' set to 256K (the default is 64K) using
758 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
759 definition from 0x10000 to 0x40000 in older versions.
763 config PPC_PAGE_SHIFT
765 default 18 if PPC_256K_PAGES
766 default 16 if PPC_64K_PAGES
767 default 14 if PPC_16K_PAGES
771 int "Thread shift" if EXPERT
773 default "15" if PPC_256K_PAGES
774 default "14" if PPC64
775 default "14" if KASAN
778 Used to define the stack size. The default is almost always what you
779 want. Only change this if you know what you are doing.
781 config DATA_SHIFT_BOOL
782 bool "Set custom data alignment"
783 depends on ADVANCED_OPTIONS
784 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE
785 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX)
787 This option allows you to set the kernel data alignment. When
788 RAM is mapped by blocks, the alignment needs to fit the size and
789 number of possible blocks. The default should be OK for most configs.
791 Say N here unless you know what you are doing.
794 int "Data shift" if DATA_SHIFT_BOOL
795 default 24 if STRICT_KERNEL_RWX && PPC64
796 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
797 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
798 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
799 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
800 default 23 if STRICT_KERNEL_RWX && PPC_8xx
801 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA
802 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
803 default PPC_PAGE_SHIFT
805 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
806 Smaller is the alignment, greater is the number of necessary DBATs.
808 On 8xx, large pages (512kb or 8M) are used to map kernel linear
809 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
810 in that case. If PIN_TLB is selected, it must be aligned to 8M as
811 8M pages will be pinned.
813 config FORCE_MAX_ZONEORDER
814 int "Maximum zone order"
815 range 8 9 if PPC64 && PPC_64K_PAGES
816 default "9" if PPC64 && PPC_64K_PAGES
817 range 13 13 if PPC64 && !PPC_64K_PAGES
818 default "13" if PPC64 && !PPC_64K_PAGES
819 range 9 64 if PPC32 && PPC_16K_PAGES
820 default "9" if PPC32 && PPC_16K_PAGES
821 range 7 64 if PPC32 && PPC_64K_PAGES
822 default "7" if PPC32 && PPC_64K_PAGES
823 range 5 64 if PPC32 && PPC_256K_PAGES
824 default "5" if PPC32 && PPC_256K_PAGES
828 The kernel memory allocator divides physically contiguous memory
829 blocks into "zones", where each zone is a power of two number of
830 pages. This option selects the largest power of two that the kernel
831 keeps in the memory allocator. If you need to allocate very large
832 blocks of physically contiguous memory, then you may need to
835 This config option is actually maximum order plus one. For example,
836 a value of 11 means that the largest free memory block is 2^10 pages.
838 The page size is not necessarily 4KB. For example, on 64-bit
839 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
840 this in mind when choosing a value for this option.
842 config PPC_SUBPAGE_PROT
843 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
845 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
847 This option adds support for system call to allow user programs
848 to set access permissions (read/write, readonly, or no access)
849 on the 4k subpages of each 64k page.
851 If unsure, say N here.
853 config PPC_PROT_SAO_LPAR
854 bool "Support PROT_SAO mappings in LPARs"
855 depends on PPC_BOOK3S_64
857 This option adds support for PROT_SAO mappings from userspace
858 inside LPARs on supported CPUs.
860 This may cause issues when performing guest migration from
861 a CPU that supports SAO to one that does not.
863 If unsure, say N here.
865 config PPC_COPRO_BASE
869 bool "SMT (Hyperthreading) scheduler support"
870 depends on PPC64 && SMP
872 SMT scheduler support improves the CPU scheduler's decision making
873 when dealing with POWER5 cpus at a cost of slightly increased
874 overhead in some places. If unsure say N here.
876 config PPC_DENORMALISATION
877 bool "PowerPC denormalisation exception handling"
878 depends on PPC_BOOK3S_64
879 default "y" if PPC_POWERNV
881 Add support for handling denormalisation of single precision
882 values. Useful for bare metal only. If unsure say Y here.
885 string "Initial kernel command string"
888 On some platforms, there is currently no way for the boot loader to
889 pass arguments to the kernel. For these platforms, you can supply
890 some command-line options at build time by entering them here. In
891 most cases you will need to specify the root device here.
894 prompt "Kernel command line type" if CMDLINE != ""
895 default CMDLINE_FROM_BOOTLOADER
897 config CMDLINE_FROM_BOOTLOADER
898 bool "Use bootloader kernel arguments if available"
900 Uses the command-line options passed by the boot loader. If
901 the boot loader doesn't provide any, the default kernel command
902 string provided in CMDLINE will be used.
904 config CMDLINE_EXTEND
905 bool "Extend bootloader kernel arguments"
907 The command-line arguments provided by the boot loader will be
908 appended to the default kernel command string.
911 bool "Always use the default kernel command string"
913 Always use the default kernel command string, even if the boot
914 loader passes other arguments to the kernel.
915 This is useful if you cannot or don't want to change the
916 command-line options your boot loader passes to the kernel.
921 string "Additional default image types"
923 List additional targets to be built by the bootwrapper here (separated
924 by spaces). This is useful for targets that depend of device tree
925 files in the .dts directory.
927 Targets in this list will be build as part of the default build
928 target, or when the user does a 'make zImage' or a
929 'make zImage.initrd'.
931 If unsure, leave blank
933 config ARCH_WANTS_FREEZER_CONTROL
937 source "kernel/power/Kconfig"
940 prompt "PowerPC Memory Protection Keys"
942 depends on PPC_BOOK3S_64
943 select ARCH_USES_HIGH_VMA_FLAGS
944 select ARCH_HAS_PKEYS
946 Memory Protection Keys provides a mechanism for enforcing
947 page-based protections, but without requiring modification of the
948 page tables when an application changes protection domains.
950 For details, see Documentation/core-api/protection-keys.rst
954 config PPC_SECURE_BOOT
955 prompt "Enable secure boot support"
957 depends on PPC_POWERNV || PPC_PSERIES
958 depends on IMA_ARCH_POLICY
959 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
961 Systems with firmware secure boot enabled need to define security
962 policies to extend secure boot to the OS. This config allows a user
963 to enable OS secure boot on systems that have firmware support for
964 it. If in doubt say N.
966 config PPC_SECVAR_SYSFS
967 bool "Enable sysfs interface for POWER secure variables"
969 depends on PPC_SECURE_BOOT
972 POWER secure variables are managed and controlled by firmware.
973 These variables are exposed to userspace via sysfs to enable
974 read/write operations on these variables. Say Y if you have
975 secure boot enabled and want to expose variables to userspace.
977 config PPC_RTAS_FILTER
978 bool "Enable filtering of RTAS syscalls"
982 The RTAS syscall API has security issues that could be used to
983 compromise system integrity. This option enforces restrictions on the
984 RTAS calls and arguments passed by userspace programs to mitigate
987 Say Y unless you know what you are doing and the filter is causing
999 bool "Support for ISA-bus hardware"
1003 Find out whether you have ISA slots on your motherboard. ISA is the
1004 name of a bus system, i.e. the way the CPU talks to the other stuff
1005 inside your box. If you have an Apple machine, say N here; if you
1006 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1007 embedded board, consult your board documentation.
1009 config GENERIC_ISA_DMA
1011 depends on ISA_DMA_API
1014 config PPC_INDIRECT_PCI
1017 default y if 40x || 44x
1027 select ARCH_HAS_DMA_SET_MASK
1028 select PPC_INDIRECT_PCI
1034 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1036 Freescale MPC85xx/MPC86xx power management controller support
1037 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1042 depends on SUSPEND && (44x || 40x)
1044 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1045 It also enables support for two different idle states (idle-wait
1052 bool "Freescale Local Bus support"
1054 Enables reporting of errors from the Freescale local bus
1055 controller. Also contains some common code used by
1056 drivers for specific local bus peripherals.
1060 depends on PPC_83xx || QUICC_ENGINE || CPM2
1062 Freescale General-purpose Timers support
1066 depends on PCI && 8260
1067 select PPC_INDIRECT_PCI
1071 bool "Freescale Embedded SRIO Controller support"
1072 depends on RAPIDIO = y && HAVE_RAPIDIO
1075 Include support for RapidIO controller on Freescale embedded
1076 processors (MPC8548, MPC8641, etc).
1080 config NONSTATIC_KERNEL
1083 menu "Advanced setup"
1086 config ADVANCED_OPTIONS
1087 bool "Prompt for advanced kernel configuration options"
1089 This option will enable prompting for a variety of advanced kernel
1090 configuration options. These options can cause the kernel to not
1091 work if they are set incorrectly, but can be used to optimize certain
1092 aspects of kernel memory management.
1094 Unless you know what you are doing, say N here.
1096 comment "Default settings for advanced configuration options are used"
1097 depends on !ADVANCED_OPTIONS
1099 config LOWMEM_SIZE_BOOL
1100 bool "Set maximum low memory"
1101 depends on ADVANCED_OPTIONS
1103 This option allows you to set the maximum amount of memory which
1104 will be used as "low memory", that is, memory which the kernel can
1105 access directly, without having to set up a kernel virtual mapping.
1106 This can be useful in optimizing the layout of kernel virtual
1109 Say N here unless you know what you are doing.
1112 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1113 default "0x30000000"
1115 config LOWMEM_CAM_NUM_BOOL
1116 bool "Set number of CAMs to use to map low memory"
1117 depends on ADVANCED_OPTIONS && FSL_BOOKE
1119 This option allows you to set the maximum number of CAM slots that
1120 will be used to map low memory. There are a limited number of slots
1121 available and even more limited number that will fit in the L1 MMU.
1122 However, using more entries will allow mapping more low memory. This
1123 can be useful in optimizing the layout of kernel virtual memory.
1125 Say N here unless you know what you are doing.
1127 config LOWMEM_CAM_NUM
1128 depends on FSL_BOOKE
1129 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1132 config DYNAMIC_MEMSTART
1133 bool "Enable page aligned dynamic load address for kernel"
1134 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1135 select NONSTATIC_KERNEL
1137 This option enables the kernel to be loaded at any page aligned
1138 physical address. The kernel creates a mapping from KERNELBASE to
1139 the address where the kernel is loaded. The page size here implies
1140 the TLB page size of the mapping for kernel on the particular platform.
1141 Please refer to the init code for finding the TLB page size.
1143 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1144 kernel image, where the only restriction is the page aligned kernel
1145 load address. When this option is enabled, the compile time physical
1146 address CONFIG_PHYSICAL_START is ignored.
1148 This option is overridden by CONFIG_RELOCATABLE
1150 config PAGE_OFFSET_BOOL
1151 bool "Set custom page offset address"
1152 depends on ADVANCED_OPTIONS
1154 This option allows you to set the kernel virtual address at which
1155 the kernel will map low memory. This can be useful in optimizing
1156 the virtual memory layout of the system.
1158 Say N here unless you know what you are doing.
1161 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1162 default "0xc0000000"
1164 config KERNEL_START_BOOL
1165 bool "Set custom kernel base address"
1166 depends on ADVANCED_OPTIONS
1168 This option allows you to set the kernel virtual address at which
1169 the kernel will be loaded. Normally this should match PAGE_OFFSET
1170 however there are times (like kdump) that one might not want them
1173 Say N here unless you know what you are doing.
1176 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1177 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1178 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1179 default "0xc0000000"
1181 config PHYSICAL_START_BOOL
1182 bool "Set physical address where the kernel is loaded"
1183 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1185 This gives the physical address where the kernel is loaded.
1187 Say N here unless you know what you are doing.
1189 config PHYSICAL_START
1190 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1191 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1192 default "0x00000000"
1194 config PHYSICAL_ALIGN
1196 default "0x04000000" if FSL_BOOKE
1198 This value puts the alignment restrictions on physical address
1199 where kernel is loaded and run from. Kernel is compiled for an
1200 address which meets above alignment restriction.
1202 config TASK_SIZE_BOOL
1203 bool "Set custom user task size"
1204 depends on ADVANCED_OPTIONS
1206 This option allows you to set the amount of virtual address space
1207 allocated to user tasks. This can be useful in optimizing the
1208 virtual memory layout of the system.
1210 Say N here unless you know what you are doing.
1213 hex "Size of user task space" if TASK_SIZE_BOOL
1214 default "0x80000000" if PPC_8xx
1215 default "0xb0000000" if PPC_BOOK3S_32
1216 default "0xc0000000"
1220 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1223 default "0xc000000000000000"
1226 default "0xc000000000000000"
1227 config PHYSICAL_START
1229 default "0x00000000"
1235 config PPC_LIB_RHEAP
1238 source "arch/powerpc/kvm/Kconfig"
1240 source "kernel/livepatch/Kconfig"