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 seleted via the generic lockup detector menu which is why we
91 have no standalone config option for it here.
93 config STACKTRACE_SUPPORT
97 config TRACE_IRQFLAGS_SUPPORT
101 config LOCKDEP_SUPPORT
105 config GENERIC_LOCKBREAK
108 depends on SMP && PREEMPTION
110 config GENERIC_HWEIGHT
118 # Please keep this list sorted alphabetically.
120 select ARCH_32BIT_OFF_T if PPC32
121 select ARCH_HAS_DEBUG_VIRTUAL
122 select ARCH_HAS_DEVMEM_IS_ALLOWED
123 select ARCH_HAS_ELF_RANDOMIZE
124 select ARCH_HAS_FORTIFY_SOURCE
125 select ARCH_HAS_GCOV_PROFILE_ALL
127 select ARCH_HAS_HUGEPD if HUGETLB_PAGE
128 select ARCH_HAS_MEMREMAP_COMPAT_ALIGN
129 select ARCH_HAS_MMIOWB if PPC64
130 select ARCH_HAS_PHYS_TO_DMA
131 select ARCH_HAS_PMEM_API
132 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
133 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
134 select ARCH_HAS_PTE_SPECIAL
135 select ARCH_HAS_MEMBARRIER_CALLBACKS
136 select ARCH_HAS_MEMBARRIER_SYNC_CORE
137 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
138 select ARCH_HAS_STRICT_KERNEL_RWX if (PPC32 && !HIBERNATION)
139 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
140 select ARCH_HAS_UACCESS_FLUSHCACHE
141 select ARCH_HAS_COPY_MC if PPC64
142 select ARCH_HAS_UBSAN_SANITIZE_ALL
143 select ARCH_HAVE_NMI_SAFE_CMPXCHG
144 select ARCH_KEEP_MEMBLOCK
145 select ARCH_MIGHT_HAVE_PC_PARPORT
146 select ARCH_MIGHT_HAVE_PC_SERIO
147 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
148 select ARCH_SUPPORTS_ATOMIC_RMW
149 select ARCH_USE_BUILTIN_BSWAP
150 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
151 select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS
152 select ARCH_USE_QUEUED_SPINLOCKS if PPC_QUEUED_SPINLOCKS
153 select ARCH_WANT_IPC_PARSE_VERSION
154 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
155 select ARCH_WANT_LD_ORPHAN_WARN
156 select ARCH_WEAK_RELEASE_ACQUIRE
158 select BUILDTIME_TABLE_SORT
159 select CLONE_BACKWARDS
160 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
161 select DMA_OPS if PPC64
162 select DMA_OPS_BYPASS if PPC64
163 select DYNAMIC_FTRACE if FUNCTION_TRACER
164 select EDAC_ATOMIC_SCRUB
166 select GENERIC_ATOMIC64 if PPC32
167 select GENERIC_CLOCKEVENTS
168 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
169 select GENERIC_CMOS_UPDATE
170 select GENERIC_CPU_AUTOPROBE
171 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
172 select GENERIC_EARLY_IOREMAP
173 select GENERIC_IRQ_SHOW
174 select GENERIC_IRQ_SHOW_LEVEL
175 select GENERIC_PCI_IOMAP if PCI
176 select GENERIC_SMP_IDLE_THREAD
177 select GENERIC_STRNCPY_FROM_USER
178 select GENERIC_STRNLEN_USER
179 select GENERIC_TIME_VSYSCALL
180 select HAVE_ARCH_AUDITSYSCALL
181 select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
182 select HAVE_ARCH_JUMP_LABEL
183 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
184 select HAVE_ARCH_KASAN_VMALLOC if PPC32 && PPC_PAGE_SHIFT <= 14
185 select HAVE_ARCH_KGDB
186 select HAVE_ARCH_MMAP_RND_BITS
187 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
188 select HAVE_ARCH_NVRAM_OPS
189 select HAVE_ARCH_SECCOMP_FILTER
190 select HAVE_ARCH_TRACEHOOK
191 select HAVE_ASM_MODVERSIONS
192 select HAVE_C_RECORDMCOUNT
193 select HAVE_CBPF_JIT if !PPC64
194 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
195 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
196 select HAVE_CONTEXT_TRACKING if PPC64
197 select HAVE_TIF_NOHZ if PPC64
198 select HAVE_DEBUG_KMEMLEAK
199 select HAVE_DEBUG_STACKOVERFLOW
200 select HAVE_DYNAMIC_FTRACE
201 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
202 select HAVE_EBPF_JIT if PPC64
203 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
205 select HAVE_FTRACE_MCOUNT_RECORD
206 select HAVE_FUNCTION_ERROR_INJECTION
207 select HAVE_FUNCTION_GRAPH_TRACER
208 select HAVE_FUNCTION_TRACER
209 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
210 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
212 select HAVE_IOREMAP_PROT
213 select HAVE_IRQ_EXIT_ON_IRQ_STACK
214 select HAVE_KERNEL_GZIP
215 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
216 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
217 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
219 select HAVE_KPROBES_ON_FTRACE
220 select HAVE_KRETPROBES
221 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
222 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
223 select HAVE_MOD_ARCH_SPECIFIC
224 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
225 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
227 select HAVE_OPTPROBES if PPC64
228 select HAVE_PERF_EVENTS
229 select HAVE_PERF_EVENTS_NMI if PPC64
230 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
231 select HAVE_PERF_REGS
232 select HAVE_PERF_USER_STACK_DUMP
233 select MMU_GATHER_RCU_TABLE_FREE
234 select MMU_GATHER_PAGE_SIZE
235 select HAVE_REGS_AND_STACK_ACCESS_API
236 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
237 select HAVE_SYSCALL_TRACEPOINTS
238 select HAVE_VIRT_CPU_ACCOUNTING
239 select HAVE_IRQ_TIME_ACCOUNTING
241 select IOMMU_HELPER if PPC64
243 select IRQ_FORCED_THREADING
244 select MODULES_USE_ELF_RELA
245 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
246 select NEED_SG_DMA_LENGTH
248 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
249 select OF_EARLY_FLATTREE
250 select OLD_SIGACTION if PPC32
251 select OLD_SIGSUSPEND
252 select PCI_DOMAINS if PCI
253 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
254 select PCI_SYSCALL if PCI
255 select PPC_DAWR if PPC64
258 select SYSCTL_EXCEPTION_TRACE
259 select THREAD_INFO_IN_TASK
260 select VIRT_TO_BUS if !PPC64
262 # Please keep this list sorted alphabetically.
265 config PPC_BARRIER_NOSPEC
268 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
279 bool "Enable support for 32bit binaries"
281 default y if !CPU_LITTLE_ENDIAN
282 select COMPAT_BINFMT_ELF
283 select ARCH_WANT_OLD_COMPAT_IPC
284 select COMPAT_OLD_SIGACTION
286 config SYSVIPC_COMPAT
288 depends on COMPAT && SYSVIPC
291 config SCHED_OMIT_FRAME_POINTER
295 config ARCH_MAY_HAVE_PC_FDC
299 config PPC_UDBG_16550
302 config GENERIC_TBSYNC
304 default y if PPC32 && SMP
315 config SYS_SUPPORTS_APM_EMULATION
316 default y if PMAC_APM_EMU
322 Used to allow a board to specify it wants an ePAPR compliant wrapper.
324 config DEFAULT_UIMAGE
327 Used to allow a board to specify it wants a uImage built by default
329 config ARCH_HIBERNATION_POSSIBLE
333 config ARCH_SUSPEND_POSSIBLE
335 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
336 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
339 config ARCH_SUSPEND_NONZERO_CPU
341 depends on PPC_POWERNV || PPC_PSERIES
343 config PPC_DCR_NATIVE
351 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
354 config PPC_OF_PLATFORM_PCI
357 depends on PPC64 # not supported on 32 bits yet
359 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
360 depends on PPC32 || PPC_BOOK3S_64
363 config ARCH_SUPPORTS_UPROBES
366 config PPC_ADV_DEBUG_REGS
368 depends on 40x || BOOKE
371 config PPC_ADV_DEBUG_IACS
373 depends on PPC_ADV_DEBUG_REGS
377 config PPC_ADV_DEBUG_DACS
379 depends on PPC_ADV_DEBUG_REGS
382 config PPC_ADV_DEBUG_DVCS
384 depends on PPC_ADV_DEBUG_REGS
388 config PPC_ADV_DEBUG_DAC_RANGE
390 depends on PPC_ADV_DEBUG_REGS && 44x
398 default y if PPC_BOOK3E_64
400 config PGTABLE_LEVELS
405 source "arch/powerpc/sysdev/Kconfig"
406 source "arch/powerpc/platforms/Kconfig"
408 menu "Kernel options"
411 bool "High memory support"
414 source "kernel/Kconfig.hz"
416 config HUGETLB_PAGE_SIZE_VARIABLE
418 depends on HUGETLB_PAGE && PPC_BOOK3S_64
421 config MATH_EMULATION
422 bool "Math emulation"
423 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
425 Some PowerPC chips designed for embedded applications do not have
426 a floating-point unit and therefore do not implement the
427 floating-point instructions in the PowerPC instruction set. If you
428 say Y here, the kernel will include code to emulate a floating-point
429 unit, which will allow programs that use floating-point
432 This is also useful to emulate missing (optional) instructions
433 such as fsqrt on cores that do have an FPU but do not implement
434 them (such as Freescale BookE).
437 prompt "Math emulation options"
438 default MATH_EMULATION_FULL
439 depends on MATH_EMULATION
441 config MATH_EMULATION_FULL
442 bool "Emulate all the floating point instructions"
444 Select this option will enable the kernel to support to emulate
445 all the floating point instructions. If your SoC doesn't have
446 a FPU, you should select this.
448 config MATH_EMULATION_HW_UNIMPLEMENTED
449 bool "Just emulate the FPU unimplemented instructions"
451 Select this if you know there does have a hardware FPU on your
452 SoC, but some floating point instructions are not implemented by that.
456 config PPC_TRANSACTIONAL_MEM
457 bool "Transactional Memory support for POWERPC"
458 depends on PPC_BOOK3S_64
463 Support user-mode Transactional Memory on POWERPC.
466 bool "Ultravisor support"
467 depends on KVM_BOOK3S_HV_POSSIBLE
468 depends on DEVICE_PRIVATE
471 This option paravirtualizes the kernel to run in POWER platforms that
472 supports the Protected Execution Facility (PEF). On such platforms,
473 the ultravisor firmware runs at a privilege level above the
478 config LD_HEAD_STUB_CATCH
479 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
482 Very large kernels can cause linker branch stubs to be generated by
483 code in head_64.S, which moves the head text sections out of their
484 specified location. This option can work around the problem.
488 config MPROFILE_KERNEL
489 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
490 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
493 bool "Support for enabling/disabling CPUs"
494 depends on SMP && (PPC_PSERIES || \
495 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
497 Say Y here to be able to disable and re-enable individual
498 CPUs at runtime on SMP machines.
500 Say N if you are unsure.
502 config PPC_QUEUED_SPINLOCKS
503 bool "Queued spinlocks"
506 Say Y here to use queued spinlocks which give better scalability and
507 fairness on large SMP and NUMA systems without harming single threaded
510 This option is currently experimental, the code is more complex and
511 less tested so it defaults to "N" for the moment.
515 config ARCH_CPU_PROBE_RELEASE
517 depends on HOTPLUG_CPU
519 config ARCH_ENABLE_MEMORY_HOTPLUG
522 config ARCH_ENABLE_MEMORY_HOTREMOVE
525 config PPC64_SUPPORTS_MEMORY_FAILURE
526 bool "Add support for memory hwpoison"
527 depends on PPC_BOOK3S_64
528 default "y" if PPC_POWERNV
529 select ARCH_SUPPORTS_MEMORY_FAILURE
532 bool "kexec system call"
533 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
536 kexec is a system call that implements the ability to shutdown your
537 current kernel, and to start another kernel. It is like a reboot
538 but it is independent of the system firmware. And like a reboot
539 you can start any kernel with it, not just Linux.
541 The name comes from the similarity to the exec system call.
543 It is an ongoing process to be certain the hardware in a machine
544 is properly shutdown, so do not be surprised if this code does not
545 initially work for you. As of this writing the exact hardware
546 interface is strongly in flux, so no good recommendation can be
550 bool "kexec file based system call"
552 select HAVE_IMA_KEXEC
557 depends on CRYPTO_SHA256=y
559 This is a new version of the kexec system call. This call is
560 file based and takes in file descriptors as system call arguments
561 for kernel and initramfs as opposed to a list of segments as is the
562 case for the older kexec call.
564 config ARCH_HAS_KEXEC_PURGATORY
568 bool "Build a relocatable kernel"
569 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
570 select NONSTATIC_KERNEL
571 select MODULE_REL_CRCS if MODVERSIONS
573 This builds a kernel image that is capable of running at the
574 location the kernel is loaded at. For ppc32, there is no any
575 alignment restrictions, and this feature is a superset of
576 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
577 16k-aligned base address. The kernel is linked as a
578 position-independent executable (PIE) and contains dynamic relocations
579 which are processed early in the bootup process.
581 One use is for the kexec on panic case where the recovery kernel
582 must live at a different physical address than the primary
585 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
586 it has been loaded at and the compile time physical addresses
587 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
588 setting can still be useful to bootwrappers that need to know the
589 load address of the kernel (eg. u-boot/mkimage).
591 config RANDOMIZE_BASE
592 bool "Randomize the address of the kernel image"
593 depends on (FSL_BOOKE && FLATMEM && PPC32)
594 depends on RELOCATABLE
596 Randomizes the virtual address at which the kernel image is
597 loaded, as a security feature that deters exploit attempts
598 relying on knowledge of the location of kernel internals.
602 config RELOCATABLE_TEST
603 bool "Test relocatable kernel"
604 depends on (PPC64 && RELOCATABLE)
606 This runs the relocatable kernel at the address it was initially
607 loaded at, which tends to be non-zero and therefore test the
611 bool "Build a dump capture kernel"
612 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
613 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
615 Build a kernel suitable for use as a dump capture kernel.
616 The same kernel binary can be used as production kernel and dump
620 bool "Firmware-assisted dump"
621 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
625 A robust mechanism to get reliable kernel crash dump with
626 assistance from firmware. This approach does not use kexec,
627 instead firmware assists in booting the capture kernel
628 while preserving memory contents. Firmware-assisted dump
629 is meant to be a kdump replacement offering robustness and
630 speed not possible without system firmware assistance.
632 If unsure, say "y". Only special kernels like petitboot may
633 need to say "N" here.
635 config PRESERVE_FA_DUMP
636 bool "Preserve Firmware-assisted dump"
637 depends on PPC64 && PPC_POWERNV && !FA_DUMP
639 On a kernel with FA_DUMP disabled, this option helps to preserve
640 crash data from a previously crash'ed kernel. Useful when the next
641 memory preserving kernel boot would process this crash data.
642 Petitboot kernel is the typical usecase for this option.
645 bool "Export OPAL memory as /sys/firmware/opal/core"
646 depends on PPC64 && PPC_POWERNV
648 This option uses the MPIPL support in firmware to provide an
649 ELF core of OPAL memory after a crash. The ELF core is exported
650 as /sys/firmware/opal/core file which is helpful in debugging
651 OPAL crashes using GDB.
654 bool "Distribute interrupts on all CPUs by default"
657 This option gives the kernel permission to distribute IRQs across
658 multiple CPUs. Saying N here will route all IRQs to the first
659 CPU. Generally saying Y is safe, although some problems have been
660 reported with SMP Power Macintoshes with this option enabled.
665 default y if SMP && PPC_PSERIES
671 depends on NEED_MULTIPLE_NODES
673 config USE_PERCPU_NUMA_NODE_ID
677 config HAVE_MEMORYLESS_NODES
681 config ARCH_SELECT_MEMORY_MODEL
685 config ARCH_FLATMEM_ENABLE
687 depends on (PPC64 && !NUMA) || PPC32
689 config ARCH_SPARSEMEM_ENABLE
692 select SPARSEMEM_VMEMMAP_ENABLE
694 config ARCH_SPARSEMEM_DEFAULT
696 depends on PPC_BOOK3S_64
698 config SYS_SUPPORTS_HUGETLBFS
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
713 bool "Using standard binutils settings"
717 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
718 Note, that kernel will be able to run only those applications,
719 which had been compiled using binutils later than 2.17.50.0.3 with
720 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
721 the older binutils, you can patch them with a trivial patch, which
722 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
728 Select the kernel logical page size. Increasing the page size
729 will reduce software overhead at each page boundary, allow
730 hardware prefetch mechanisms to be more effective, and allow
731 larger dma transfers increasing IO efficiency and reducing
732 overhead. However the utilization of memory will increase.
733 For example, each cached file will using a multiple of the
734 page size to hold its contents and the difference between the
735 end of file and the end of page is wasted.
737 Some dedicated systems, such as software raid serving with
738 accelerated calculations, have shown significant increases.
740 If you configure a 64 bit kernel for 64k pages but the
741 processor does not support them, then the kernel will simulate
742 them with 4k pages, loading them on demand, but with the
743 reduced software overhead and larger internal fragmentation.
744 For the 32 bit kernel, a large page option will not be offered
745 unless it is supported by the configured processor.
747 If unsure, choose 4K_PAGES.
751 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
755 depends on 44x || PPC_8xx
759 depends on 44x || PPC_BOOK3S_64
760 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
762 config PPC_256K_PAGES
763 bool "256k page size"
764 depends on 44x && !STDBINUTILS
766 Make the page size 256k.
768 As the ELF standard only requires alignment to support page
769 sizes up to 64k, you will need to compile all of your user
770 space applications with a non-standard binutils settings
771 (see the STDBINUTILS description for details).
773 Say N unless you know what you are doing.
777 config PPC_PAGE_SHIFT
779 default 18 if PPC_256K_PAGES
780 default 16 if PPC_64K_PAGES
781 default 14 if PPC_16K_PAGES
785 int "Thread shift" if EXPERT
787 default "15" if PPC_256K_PAGES
788 default "14" if PPC64
789 default "14" if KASAN
792 Used to define the stack size. The default is almost always what you
793 want. Only change this if you know what you are doing.
795 config DATA_SHIFT_BOOL
796 bool "Set custom data alignment"
797 depends on ADVANCED_OPTIONS
798 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC
799 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && \
800 (!PIN_TLB_TEXT || !STRICT_KERNEL_RWX))
802 This option allows you to set the kernel data alignment. When
803 RAM is mapped by blocks, the alignment needs to fit the size and
804 number of possible blocks. The default should be OK for most configs.
806 Say N here unless you know what you are doing.
809 int "Data shift" if DATA_SHIFT_BOOL
810 default 24 if STRICT_KERNEL_RWX && PPC64
811 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_BOOK3S_32
812 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_8xx
813 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
814 default 18 if DEBUG_PAGEALLOC && PPC_BOOK3S_32
815 default 23 if STRICT_KERNEL_RWX && PPC_8xx
816 default 23 if DEBUG_PAGEALLOC && PPC_8xx && PIN_TLB_DATA
817 default 19 if DEBUG_PAGEALLOC && PPC_8xx
818 default PPC_PAGE_SHIFT
820 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
821 Smaller is the alignment, greater is the number of necessary DBATs.
823 On 8xx, large pages (512kb or 8M) are used to map kernel linear
824 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
825 in that case. If PIN_TLB is selected, it must be aligned to 8M as
826 8M pages will be pinned.
828 config FORCE_MAX_ZONEORDER
829 int "Maximum zone order"
830 range 8 9 if PPC64 && PPC_64K_PAGES
831 default "9" if PPC64 && PPC_64K_PAGES
832 range 13 13 if PPC64 && !PPC_64K_PAGES
833 default "13" if PPC64 && !PPC_64K_PAGES
834 range 9 64 if PPC32 && PPC_16K_PAGES
835 default "9" if PPC32 && PPC_16K_PAGES
836 range 7 64 if PPC32 && PPC_64K_PAGES
837 default "7" if PPC32 && PPC_64K_PAGES
838 range 5 64 if PPC32 && PPC_256K_PAGES
839 default "5" if PPC32 && PPC_256K_PAGES
843 The kernel memory allocator divides physically contiguous memory
844 blocks into "zones", where each zone is a power of two number of
845 pages. This option selects the largest power of two that the kernel
846 keeps in the memory allocator. If you need to allocate very large
847 blocks of physically contiguous memory, then you may need to
850 This config option is actually maximum order plus one. For example,
851 a value of 11 means that the largest free memory block is 2^10 pages.
853 The page size is not necessarily 4KB. For example, on 64-bit
854 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
855 this in mind when choosing a value for this option.
857 config PPC_SUBPAGE_PROT
858 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
860 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
862 This option adds support for system call to allow user programs
863 to set access permissions (read/write, readonly, or no access)
864 on the 4k subpages of each 64k page.
866 If unsure, say N here.
868 config PPC_PROT_SAO_LPAR
869 bool "Support PROT_SAO mappings in LPARs"
870 depends on PPC_BOOK3S_64
872 This option adds support for PROT_SAO mappings from userspace
873 inside LPARs on supported CPUs.
875 This may cause issues when performing guest migration from
876 a CPU that supports SAO to one that does not.
878 If unsure, say N here.
880 config PPC_COPRO_BASE
884 bool "SMT (Hyperthreading) scheduler support"
885 depends on PPC64 && SMP
887 SMT scheduler support improves the CPU scheduler's decision making
888 when dealing with POWER5 cpus at a cost of slightly increased
889 overhead in some places. If unsure say N here.
891 config PPC_DENORMALISATION
892 bool "PowerPC denormalisation exception handling"
893 depends on PPC_BOOK3S_64
894 default "y" if PPC_POWERNV
896 Add support for handling denormalisation of single precision
897 values. Useful for bare metal only. If unsure say Y here.
900 string "Initial kernel command string"
903 On some platforms, there is currently no way for the boot loader to
904 pass arguments to the kernel. For these platforms, you can supply
905 some command-line options at build time by entering them here. In
906 most cases you will need to specify the root device here.
909 prompt "Kernel command line type" if CMDLINE != ""
910 default CMDLINE_FROM_BOOTLOADER
912 config CMDLINE_FROM_BOOTLOADER
913 bool "Use bootloader kernel arguments if available"
915 Uses the command-line options passed by the boot loader. If
916 the boot loader doesn't provide any, the default kernel command
917 string provided in CMDLINE will be used.
919 config CMDLINE_EXTEND
920 bool "Extend bootloader kernel arguments"
922 The command-line arguments provided by the boot loader will be
923 appended to the default kernel command string.
926 bool "Always use the default kernel command string"
928 Always use the default kernel command string, even if the boot
929 loader passes other arguments to the kernel.
930 This is useful if you cannot or don't want to change the
931 command-line options your boot loader passes to the kernel.
936 string "Additional default image types"
938 List additional targets to be built by the bootwrapper here (separated
939 by spaces). This is useful for targets that depend of device tree
940 files in the .dts directory.
942 Targets in this list will be build as part of the default build
943 target, or when the user does a 'make zImage' or a
944 'make zImage.initrd'.
946 If unsure, leave blank
948 config ARCH_WANTS_FREEZER_CONTROL
952 source "kernel/power/Kconfig"
955 prompt "PowerPC Memory Protection Keys"
957 depends on PPC_BOOK3S_64
958 select ARCH_USES_HIGH_VMA_FLAGS
959 select ARCH_HAS_PKEYS
961 Memory Protection Keys provides a mechanism for enforcing
962 page-based protections, but without requiring modification of the
963 page tables when an application changes protection domains.
965 For details, see Documentation/core-api/protection-keys.rst
969 config PPC_SECURE_BOOT
970 prompt "Enable secure boot support"
972 depends on PPC_POWERNV || PPC_PSERIES
973 depends on IMA_ARCH_POLICY
974 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
976 Systems with firmware secure boot enabled need to define security
977 policies to extend secure boot to the OS. This config allows a user
978 to enable OS secure boot on systems that have firmware support for
979 it. If in doubt say N.
981 config PPC_SECVAR_SYSFS
982 bool "Enable sysfs interface for POWER secure variables"
984 depends on PPC_SECURE_BOOT
987 POWER secure variables are managed and controlled by firmware.
988 These variables are exposed to userspace via sysfs to enable
989 read/write operations on these variables. Say Y if you have
990 secure boot enabled and want to expose variables to userspace.
992 config PPC_RTAS_FILTER
993 bool "Enable filtering of RTAS syscalls"
997 The RTAS syscall API has security issues that could be used to
998 compromise system integrity. This option enforces restrictions on the
999 RTAS calls and arguments passed by userspace programs to mitigate
1002 Say Y unless you know what you are doing and the filter is causing
1014 bool "Support for ISA-bus hardware"
1018 Find out whether you have ISA slots on your motherboard. ISA is the
1019 name of a bus system, i.e. the way the CPU talks to the other stuff
1020 inside your box. If you have an Apple machine, say N here; if you
1021 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1022 embedded board, consult your board documentation.
1024 config GENERIC_ISA_DMA
1026 depends on ISA_DMA_API
1029 config PPC_INDIRECT_PCI
1032 default y if 40x || 44x
1042 select ARCH_HAS_DMA_SET_MASK
1043 select PPC_INDIRECT_PCI
1049 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1051 Freescale MPC85xx/MPC86xx power management controller support
1052 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1057 depends on SUSPEND && (44x || 40x)
1059 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1060 It also enables support for two different idle states (idle-wait
1067 bool "Freescale Local Bus support"
1069 Enables reporting of errors from the Freescale local bus
1070 controller. Also contains some common code used by
1071 drivers for specific local bus peripherals.
1075 depends on PPC_83xx || QUICC_ENGINE || CPM2
1077 Freescale General-purpose Timers support
1081 depends on PCI && 8260
1082 select PPC_INDIRECT_PCI
1086 bool "Freescale Embedded SRIO Controller support"
1087 depends on RAPIDIO = y && HAVE_RAPIDIO
1090 Include support for RapidIO controller on Freescale embedded
1091 processors (MPC8548, MPC8641, etc).
1095 config NONSTATIC_KERNEL
1098 menu "Advanced setup"
1101 config ADVANCED_OPTIONS
1102 bool "Prompt for advanced kernel configuration options"
1104 This option will enable prompting for a variety of advanced kernel
1105 configuration options. These options can cause the kernel to not
1106 work if they are set incorrectly, but can be used to optimize certain
1107 aspects of kernel memory management.
1109 Unless you know what you are doing, say N here.
1111 comment "Default settings for advanced configuration options are used"
1112 depends on !ADVANCED_OPTIONS
1114 config LOWMEM_SIZE_BOOL
1115 bool "Set maximum low memory"
1116 depends on ADVANCED_OPTIONS
1118 This option allows you to set the maximum amount of memory which
1119 will be used as "low memory", that is, memory which the kernel can
1120 access directly, without having to set up a kernel virtual mapping.
1121 This can be useful in optimizing the layout of kernel virtual
1124 Say N here unless you know what you are doing.
1127 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1128 default "0x30000000"
1130 config LOWMEM_CAM_NUM_BOOL
1131 bool "Set number of CAMs to use to map low memory"
1132 depends on ADVANCED_OPTIONS && FSL_BOOKE
1134 This option allows you to set the maximum number of CAM slots that
1135 will be used to map low memory. There are a limited number of slots
1136 available and even more limited number that will fit in the L1 MMU.
1137 However, using more entries will allow mapping more low memory. This
1138 can be useful in optimizing the layout of kernel virtual memory.
1140 Say N here unless you know what you are doing.
1142 config LOWMEM_CAM_NUM
1143 depends on FSL_BOOKE
1144 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1147 config DYNAMIC_MEMSTART
1148 bool "Enable page aligned dynamic load address for kernel"
1149 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1150 select NONSTATIC_KERNEL
1152 This option enables the kernel to be loaded at any page aligned
1153 physical address. The kernel creates a mapping from KERNELBASE to
1154 the address where the kernel is loaded. The page size here implies
1155 the TLB page size of the mapping for kernel on the particular platform.
1156 Please refer to the init code for finding the TLB page size.
1158 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1159 kernel image, where the only restriction is the page aligned kernel
1160 load address. When this option is enabled, the compile time physical
1161 address CONFIG_PHYSICAL_START is ignored.
1163 This option is overridden by CONFIG_RELOCATABLE
1165 config PAGE_OFFSET_BOOL
1166 bool "Set custom page offset address"
1167 depends on ADVANCED_OPTIONS
1169 This option allows you to set the kernel virtual address at which
1170 the kernel will map low memory. This can be useful in optimizing
1171 the virtual memory layout of the system.
1173 Say N here unless you know what you are doing.
1176 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1177 default "0xc0000000"
1179 config KERNEL_START_BOOL
1180 bool "Set custom kernel base address"
1181 depends on ADVANCED_OPTIONS
1183 This option allows you to set the kernel virtual address at which
1184 the kernel will be loaded. Normally this should match PAGE_OFFSET
1185 however there are times (like kdump) that one might not want them
1188 Say N here unless you know what you are doing.
1191 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1192 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1193 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1194 default "0xc0000000"
1196 config PHYSICAL_START_BOOL
1197 bool "Set physical address where the kernel is loaded"
1198 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1200 This gives the physical address where the kernel is loaded.
1202 Say N here unless you know what you are doing.
1204 config PHYSICAL_START
1205 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1206 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1207 default "0x00000000"
1209 config PHYSICAL_ALIGN
1211 default "0x04000000" if FSL_BOOKE
1213 This value puts the alignment restrictions on physical address
1214 where kernel is loaded and run from. Kernel is compiled for an
1215 address which meets above alignment restriction.
1217 config TASK_SIZE_BOOL
1218 bool "Set custom user task size"
1219 depends on ADVANCED_OPTIONS
1221 This option allows you to set the amount of virtual address space
1222 allocated to user tasks. This can be useful in optimizing the
1223 virtual memory layout of the system.
1225 Say N here unless you know what you are doing.
1228 hex "Size of user task space" if TASK_SIZE_BOOL
1229 default "0x80000000" if PPC_8xx
1230 default "0xb0000000" if PPC_BOOK3S_32 && STRICT_KERNEL_RWX
1231 default "0xc0000000"
1235 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1238 default "0xc000000000000000"
1241 default "0xc000000000000000"
1242 config PHYSICAL_START
1244 default "0x00000000"
1250 config PPC_LIB_RHEAP
1253 source "arch/powerpc/kvm/Kconfig"
1255 source "kernel/livepatch/Kconfig"