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_WEAK_RELEASE_ACQUIRE
157 select BUILDTIME_TABLE_SORT
158 select CLONE_BACKWARDS
159 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
160 select DMA_OPS if PPC64
161 select DMA_OPS_BYPASS if PPC64
162 select DYNAMIC_FTRACE if FUNCTION_TRACER
163 select EDAC_ATOMIC_SCRUB
165 select GENERIC_ATOMIC64 if PPC32
166 select GENERIC_CLOCKEVENTS
167 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
168 select GENERIC_CMOS_UPDATE
169 select GENERIC_CPU_AUTOPROBE
170 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
171 select GENERIC_EARLY_IOREMAP
172 select GENERIC_IRQ_SHOW
173 select GENERIC_IRQ_SHOW_LEVEL
174 select GENERIC_PCI_IOMAP if PCI
175 select GENERIC_SMP_IDLE_THREAD
176 select GENERIC_STRNCPY_FROM_USER
177 select GENERIC_STRNLEN_USER
178 select GENERIC_TIME_VSYSCALL
179 select HAVE_ARCH_AUDITSYSCALL
180 select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
181 select HAVE_ARCH_JUMP_LABEL
182 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
183 select HAVE_ARCH_KASAN_VMALLOC if PPC32 && PPC_PAGE_SHIFT <= 14
184 select HAVE_ARCH_KGDB
185 select HAVE_ARCH_MMAP_RND_BITS
186 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
187 select HAVE_ARCH_NVRAM_OPS
188 select HAVE_ARCH_SECCOMP_FILTER
189 select HAVE_ARCH_TRACEHOOK
190 select HAVE_ASM_MODVERSIONS
191 select HAVE_C_RECORDMCOUNT
192 select HAVE_CBPF_JIT if !PPC64
193 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
194 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
195 select HAVE_CONTEXT_TRACKING if PPC64
196 select HAVE_TIF_NOHZ if PPC64
197 select HAVE_DEBUG_KMEMLEAK
198 select HAVE_DEBUG_STACKOVERFLOW
199 select HAVE_DYNAMIC_FTRACE
200 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
201 select HAVE_EBPF_JIT if PPC64
202 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
204 select HAVE_FTRACE_MCOUNT_RECORD
205 select HAVE_FUNCTION_ERROR_INJECTION
206 select HAVE_FUNCTION_GRAPH_TRACER
207 select HAVE_FUNCTION_TRACER
208 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
209 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
211 select HAVE_IOREMAP_PROT
212 select HAVE_IRQ_EXIT_ON_IRQ_STACK
213 select HAVE_KERNEL_GZIP
214 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
215 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
216 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
218 select HAVE_KPROBES_ON_FTRACE
219 select HAVE_KRETPROBES
220 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
221 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
222 select HAVE_MOD_ARCH_SPECIFIC
223 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
224 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
226 select HAVE_OPTPROBES if PPC64
227 select HAVE_PERF_EVENTS
228 select HAVE_PERF_EVENTS_NMI if PPC64
229 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
230 select HAVE_PERF_REGS
231 select HAVE_PERF_USER_STACK_DUMP
232 select MMU_GATHER_RCU_TABLE_FREE
233 select MMU_GATHER_PAGE_SIZE
234 select HAVE_REGS_AND_STACK_ACCESS_API
235 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
236 select HAVE_SYSCALL_TRACEPOINTS
237 select HAVE_VIRT_CPU_ACCOUNTING
238 select HAVE_IRQ_TIME_ACCOUNTING
240 select IOMMU_HELPER if PPC64
242 select IRQ_FORCED_THREADING
243 select MODULES_USE_ELF_RELA
244 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
245 select NEED_SG_DMA_LENGTH
247 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
248 select OF_EARLY_FLATTREE
249 select OLD_SIGACTION if PPC32
250 select OLD_SIGSUSPEND
251 select PCI_DOMAINS if PCI
252 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
253 select PCI_SYSCALL if PCI
254 select PPC_DAWR if PPC64
257 select SYSCTL_EXCEPTION_TRACE
258 select THREAD_INFO_IN_TASK
259 select VIRT_TO_BUS if !PPC64
261 # Please keep this list sorted alphabetically.
264 config PPC_BARRIER_NOSPEC
267 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
278 bool "Enable support for 32bit binaries"
280 default y if !CPU_LITTLE_ENDIAN
281 select COMPAT_BINFMT_ELF
282 select ARCH_WANT_OLD_COMPAT_IPC
283 select COMPAT_OLD_SIGACTION
285 config SYSVIPC_COMPAT
287 depends on COMPAT && SYSVIPC
290 config SCHED_OMIT_FRAME_POINTER
294 config ARCH_MAY_HAVE_PC_FDC
298 config PPC_UDBG_16550
301 config GENERIC_TBSYNC
303 default y if PPC32 && SMP
314 config SYS_SUPPORTS_APM_EMULATION
315 default y if PMAC_APM_EMU
321 Used to allow a board to specify it wants an ePAPR compliant wrapper.
323 config DEFAULT_UIMAGE
326 Used to allow a board to specify it wants a uImage built by default
328 config ARCH_HIBERNATION_POSSIBLE
332 config ARCH_SUSPEND_POSSIBLE
334 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
335 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
338 config ARCH_SUSPEND_NONZERO_CPU
340 depends on PPC_POWERNV || PPC_PSERIES
342 config PPC_DCR_NATIVE
350 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
353 config PPC_OF_PLATFORM_PCI
356 depends on PPC64 # not supported on 32 bits yet
358 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
359 depends on PPC32 || PPC_BOOK3S_64
362 config ARCH_SUPPORTS_UPROBES
365 config PPC_ADV_DEBUG_REGS
367 depends on 40x || BOOKE
370 config PPC_ADV_DEBUG_IACS
372 depends on PPC_ADV_DEBUG_REGS
376 config PPC_ADV_DEBUG_DACS
378 depends on PPC_ADV_DEBUG_REGS
381 config PPC_ADV_DEBUG_DVCS
383 depends on PPC_ADV_DEBUG_REGS
387 config PPC_ADV_DEBUG_DAC_RANGE
389 depends on PPC_ADV_DEBUG_REGS && 44x
397 default y if PPC_BOOK3E_64
399 config PGTABLE_LEVELS
404 source "arch/powerpc/sysdev/Kconfig"
405 source "arch/powerpc/platforms/Kconfig"
407 menu "Kernel options"
410 bool "High memory support"
413 source "kernel/Kconfig.hz"
415 config HUGETLB_PAGE_SIZE_VARIABLE
417 depends on HUGETLB_PAGE && PPC_BOOK3S_64
420 config MATH_EMULATION
421 bool "Math emulation"
422 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
424 Some PowerPC chips designed for embedded applications do not have
425 a floating-point unit and therefore do not implement the
426 floating-point instructions in the PowerPC instruction set. If you
427 say Y here, the kernel will include code to emulate a floating-point
428 unit, which will allow programs that use floating-point
431 This is also useful to emulate missing (optional) instructions
432 such as fsqrt on cores that do have an FPU but do not implement
433 them (such as Freescale BookE).
436 prompt "Math emulation options"
437 default MATH_EMULATION_FULL
438 depends on MATH_EMULATION
440 config MATH_EMULATION_FULL
441 bool "Emulate all the floating point instructions"
443 Select this option will enable the kernel to support to emulate
444 all the floating point instructions. If your SoC doesn't have
445 a FPU, you should select this.
447 config MATH_EMULATION_HW_UNIMPLEMENTED
448 bool "Just emulate the FPU unimplemented instructions"
450 Select this if you know there does have a hardware FPU on your
451 SoC, but some floating point instructions are not implemented by that.
455 config PPC_TRANSACTIONAL_MEM
456 bool "Transactional Memory support for POWERPC"
457 depends on PPC_BOOK3S_64
462 Support user-mode Transactional Memory on POWERPC.
465 bool "Ultravisor support"
466 depends on KVM_BOOK3S_HV_POSSIBLE
467 depends on DEVICE_PRIVATE
470 This option paravirtualizes the kernel to run in POWER platforms that
471 supports the Protected Execution Facility (PEF). On such platforms,
472 the ultravisor firmware runs at a privilege level above the
477 config LD_HEAD_STUB_CATCH
478 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
481 Very large kernels can cause linker branch stubs to be generated by
482 code in head_64.S, which moves the head text sections out of their
483 specified location. This option can work around the problem.
487 config MPROFILE_KERNEL
488 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
489 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
492 bool "Support for enabling/disabling CPUs"
493 depends on SMP && (PPC_PSERIES || \
494 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
496 Say Y here to be able to disable and re-enable individual
497 CPUs at runtime on SMP machines.
499 Say N if you are unsure.
501 config PPC_QUEUED_SPINLOCKS
502 bool "Queued spinlocks"
505 Say Y here to use queued spinlocks which give better scalability and
506 fairness on large SMP and NUMA systems without harming single threaded
509 This option is currently experimental, the code is more complex and
510 less tested so it defaults to "N" for the moment.
514 config ARCH_CPU_PROBE_RELEASE
516 depends on HOTPLUG_CPU
518 config ARCH_ENABLE_MEMORY_HOTPLUG
521 config ARCH_ENABLE_MEMORY_HOTREMOVE
524 config PPC64_SUPPORTS_MEMORY_FAILURE
525 bool "Add support for memory hwpoison"
526 depends on PPC_BOOK3S_64
527 default "y" if PPC_POWERNV
528 select ARCH_SUPPORTS_MEMORY_FAILURE
531 bool "kexec system call"
532 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
535 kexec is a system call that implements the ability to shutdown your
536 current kernel, and to start another kernel. It is like a reboot
537 but it is independent of the system firmware. And like a reboot
538 you can start any kernel with it, not just Linux.
540 The name comes from the similarity to the exec system call.
542 It is an ongoing process to be certain the hardware in a machine
543 is properly shutdown, so do not be surprised if this code does not
544 initially work for you. As of this writing the exact hardware
545 interface is strongly in flux, so no good recommendation can be
549 bool "kexec file based system call"
551 select HAVE_IMA_KEXEC
556 depends on CRYPTO_SHA256=y
558 This is a new version of the kexec system call. This call is
559 file based and takes in file descriptors as system call arguments
560 for kernel and initramfs as opposed to a list of segments as is the
561 case for the older kexec call.
563 config ARCH_HAS_KEXEC_PURGATORY
567 bool "Build a relocatable kernel"
568 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
569 select NONSTATIC_KERNEL
570 select MODULE_REL_CRCS if MODVERSIONS
572 This builds a kernel image that is capable of running at the
573 location the kernel is loaded at. For ppc32, there is no any
574 alignment restrictions, and this feature is a superset of
575 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
576 16k-aligned base address. The kernel is linked as a
577 position-independent executable (PIE) and contains dynamic relocations
578 which are processed early in the bootup process.
580 One use is for the kexec on panic case where the recovery kernel
581 must live at a different physical address than the primary
584 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
585 it has been loaded at and the compile time physical addresses
586 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
587 setting can still be useful to bootwrappers that need to know the
588 load address of the kernel (eg. u-boot/mkimage).
590 config RANDOMIZE_BASE
591 bool "Randomize the address of the kernel image"
592 depends on (FSL_BOOKE && FLATMEM && PPC32)
593 depends on RELOCATABLE
595 Randomizes the virtual address at which the kernel image is
596 loaded, as a security feature that deters exploit attempts
597 relying on knowledge of the location of kernel internals.
601 config RELOCATABLE_TEST
602 bool "Test relocatable kernel"
603 depends on (PPC64 && RELOCATABLE)
605 This runs the relocatable kernel at the address it was initially
606 loaded at, which tends to be non-zero and therefore test the
610 bool "Build a dump capture kernel"
611 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
612 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
614 Build a kernel suitable for use as a dump capture kernel.
615 The same kernel binary can be used as production kernel and dump
619 bool "Firmware-assisted dump"
620 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
624 A robust mechanism to get reliable kernel crash dump with
625 assistance from firmware. This approach does not use kexec,
626 instead firmware assists in booting the capture kernel
627 while preserving memory contents. Firmware-assisted dump
628 is meant to be a kdump replacement offering robustness and
629 speed not possible without system firmware assistance.
631 If unsure, say "y". Only special kernels like petitboot may
632 need to say "N" here.
634 config PRESERVE_FA_DUMP
635 bool "Preserve Firmware-assisted dump"
636 depends on PPC64 && PPC_POWERNV && !FA_DUMP
638 On a kernel with FA_DUMP disabled, this option helps to preserve
639 crash data from a previously crash'ed kernel. Useful when the next
640 memory preserving kernel boot would process this crash data.
641 Petitboot kernel is the typical usecase for this option.
644 bool "Export OPAL memory as /sys/firmware/opal/core"
645 depends on PPC64 && PPC_POWERNV
647 This option uses the MPIPL support in firmware to provide an
648 ELF core of OPAL memory after a crash. The ELF core is exported
649 as /sys/firmware/opal/core file which is helpful in debugging
650 OPAL crashes using GDB.
653 bool "Distribute interrupts on all CPUs by default"
656 This option gives the kernel permission to distribute IRQs across
657 multiple CPUs. Saying N here will route all IRQs to the first
658 CPU. Generally saying Y is safe, although some problems have been
659 reported with SMP Power Macintoshes with this option enabled.
664 default y if SMP && PPC_PSERIES
670 depends on NEED_MULTIPLE_NODES
672 config USE_PERCPU_NUMA_NODE_ID
676 config HAVE_MEMORYLESS_NODES
680 config ARCH_SELECT_MEMORY_MODEL
684 config ARCH_FLATMEM_ENABLE
686 depends on (PPC64 && !NUMA) || PPC32
688 config ARCH_SPARSEMEM_ENABLE
691 select SPARSEMEM_VMEMMAP_ENABLE
693 config ARCH_SPARSEMEM_DEFAULT
695 depends on PPC_BOOK3S_64
697 config SYS_SUPPORTS_HUGETLBFS
700 config ILLEGAL_POINTER_VALUE
702 # This is roughly half way between the top of user space and the bottom
703 # of kernel space, which seems about as good as we can get.
704 default 0x5deadbeef0000000 if PPC64
707 config ARCH_MEMORY_PROBE
709 depends on MEMORY_HOTPLUG
712 bool "Using standard binutils settings"
716 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
717 Note, that kernel will be able to run only those applications,
718 which had been compiled using binutils later than 2.17.50.0.3 with
719 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
720 the older binutils, you can patch them with a trivial patch, which
721 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
727 Select the kernel logical page size. Increasing the page size
728 will reduce software overhead at each page boundary, allow
729 hardware prefetch mechanisms to be more effective, and allow
730 larger dma transfers increasing IO efficiency and reducing
731 overhead. However the utilization of memory will increase.
732 For example, each cached file will using a multiple of the
733 page size to hold its contents and the difference between the
734 end of file and the end of page is wasted.
736 Some dedicated systems, such as software raid serving with
737 accelerated calculations, have shown significant increases.
739 If you configure a 64 bit kernel for 64k pages but the
740 processor does not support them, then the kernel will simulate
741 them with 4k pages, loading them on demand, but with the
742 reduced software overhead and larger internal fragmentation.
743 For the 32 bit kernel, a large page option will not be offered
744 unless it is supported by the configured processor.
746 If unsure, choose 4K_PAGES.
750 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
754 depends on 44x || PPC_8xx
758 depends on 44x || PPC_BOOK3S_64
759 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
761 config PPC_256K_PAGES
762 bool "256k page size"
763 depends on 44x && !STDBINUTILS
765 Make the page size 256k.
767 As the ELF standard only requires alignment to support page
768 sizes up to 64k, you will need to compile all of your user
769 space applications with a non-standard binutils settings
770 (see the STDBINUTILS description for details).
772 Say N unless you know what you are doing.
776 config PPC_PAGE_SHIFT
778 default 18 if PPC_256K_PAGES
779 default 16 if PPC_64K_PAGES
780 default 14 if PPC_16K_PAGES
784 int "Thread shift" if EXPERT
786 default "15" if PPC_256K_PAGES
787 default "14" if PPC64
788 default "14" if KASAN
791 Used to define the stack size. The default is almost always what you
792 want. Only change this if you know what you are doing.
794 config DATA_SHIFT_BOOL
795 bool "Set custom data alignment"
796 depends on ADVANCED_OPTIONS
797 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC
798 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && \
799 (!PIN_TLB_TEXT || !STRICT_KERNEL_RWX))
801 This option allows you to set the kernel data alignment. When
802 RAM is mapped by blocks, the alignment needs to fit the size and
803 number of possible blocks. The default should be OK for most configs.
805 Say N here unless you know what you are doing.
808 int "Data shift" if DATA_SHIFT_BOOL
809 default 24 if STRICT_KERNEL_RWX && PPC64
810 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_BOOK3S_32
811 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_8xx
812 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
813 default 18 if DEBUG_PAGEALLOC && PPC_BOOK3S_32
814 default 23 if STRICT_KERNEL_RWX && PPC_8xx
815 default 23 if DEBUG_PAGEALLOC && PPC_8xx && PIN_TLB_DATA
816 default 19 if DEBUG_PAGEALLOC && PPC_8xx
817 default PPC_PAGE_SHIFT
819 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
820 Smaller is the alignment, greater is the number of necessary DBATs.
822 On 8xx, large pages (512kb or 8M) are used to map kernel linear
823 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
824 in that case. If PIN_TLB is selected, it must be aligned to 8M as
825 8M pages will be pinned.
827 config FORCE_MAX_ZONEORDER
828 int "Maximum zone order"
829 range 8 9 if PPC64 && PPC_64K_PAGES
830 default "9" if PPC64 && PPC_64K_PAGES
831 range 13 13 if PPC64 && !PPC_64K_PAGES
832 default "13" if PPC64 && !PPC_64K_PAGES
833 range 9 64 if PPC32 && PPC_16K_PAGES
834 default "9" if PPC32 && PPC_16K_PAGES
835 range 7 64 if PPC32 && PPC_64K_PAGES
836 default "7" if PPC32 && PPC_64K_PAGES
837 range 5 64 if PPC32 && PPC_256K_PAGES
838 default "5" if PPC32 && PPC_256K_PAGES
842 The kernel memory allocator divides physically contiguous memory
843 blocks into "zones", where each zone is a power of two number of
844 pages. This option selects the largest power of two that the kernel
845 keeps in the memory allocator. If you need to allocate very large
846 blocks of physically contiguous memory, then you may need to
849 This config option is actually maximum order plus one. For example,
850 a value of 11 means that the largest free memory block is 2^10 pages.
852 The page size is not necessarily 4KB. For example, on 64-bit
853 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
854 this in mind when choosing a value for this option.
856 config PPC_SUBPAGE_PROT
857 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
859 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
861 This option adds support for system call to allow user programs
862 to set access permissions (read/write, readonly, or no access)
863 on the 4k subpages of each 64k page.
865 If unsure, say N here.
867 config PPC_PROT_SAO_LPAR
868 bool "Support PROT_SAO mappings in LPARs"
869 depends on PPC_BOOK3S_64
871 This option adds support for PROT_SAO mappings from userspace
872 inside LPARs on supported CPUs.
874 This may cause issues when performing guest migration from
875 a CPU that supports SAO to one that does not.
877 If unsure, say N here.
879 config PPC_COPRO_BASE
883 bool "SMT (Hyperthreading) scheduler support"
884 depends on PPC64 && SMP
886 SMT scheduler support improves the CPU scheduler's decision making
887 when dealing with POWER5 cpus at a cost of slightly increased
888 overhead in some places. If unsure say N here.
890 config PPC_DENORMALISATION
891 bool "PowerPC denormalisation exception handling"
892 depends on PPC_BOOK3S_64
893 default "y" if PPC_POWERNV
895 Add support for handling denormalisation of single precision
896 values. Useful for bare metal only. If unsure say Y here.
899 string "Initial kernel command string"
902 On some platforms, there is currently no way for the boot loader to
903 pass arguments to the kernel. For these platforms, you can supply
904 some command-line options at build time by entering them here. In
905 most cases you will need to specify the root device here.
908 prompt "Kernel command line type" if CMDLINE != ""
909 default CMDLINE_FROM_BOOTLOADER
911 config CMDLINE_FROM_BOOTLOADER
912 bool "Use bootloader kernel arguments if available"
914 Uses the command-line options passed by the boot loader. If
915 the boot loader doesn't provide any, the default kernel command
916 string provided in CMDLINE will be used.
918 config CMDLINE_EXTEND
919 bool "Extend bootloader kernel arguments"
921 The command-line arguments provided by the boot loader will be
922 appended to the default kernel command string.
925 bool "Always use the default kernel command string"
927 Always use the default kernel command string, even if the boot
928 loader passes other arguments to the kernel.
929 This is useful if you cannot or don't want to change the
930 command-line options your boot loader passes to the kernel.
935 string "Additional default image types"
937 List additional targets to be built by the bootwrapper here (separated
938 by spaces). This is useful for targets that depend of device tree
939 files in the .dts directory.
941 Targets in this list will be build as part of the default build
942 target, or when the user does a 'make zImage' or a
943 'make zImage.initrd'.
945 If unsure, leave blank
947 config ARCH_WANTS_FREEZER_CONTROL
951 source "kernel/power/Kconfig"
954 prompt "PowerPC Memory Protection Keys"
956 depends on PPC_BOOK3S_64
957 select ARCH_USES_HIGH_VMA_FLAGS
958 select ARCH_HAS_PKEYS
960 Memory Protection Keys provides a mechanism for enforcing
961 page-based protections, but without requiring modification of the
962 page tables when an application changes protection domains.
964 For details, see Documentation/core-api/protection-keys.rst
968 config PPC_SECURE_BOOT
969 prompt "Enable secure boot support"
971 depends on PPC_POWERNV || PPC_PSERIES
972 depends on IMA_ARCH_POLICY
973 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
975 Systems with firmware secure boot enabled need to define security
976 policies to extend secure boot to the OS. This config allows a user
977 to enable OS secure boot on systems that have firmware support for
978 it. If in doubt say N.
980 config PPC_SECVAR_SYSFS
981 bool "Enable sysfs interface for POWER secure variables"
983 depends on PPC_SECURE_BOOT
986 POWER secure variables are managed and controlled by firmware.
987 These variables are exposed to userspace via sysfs to enable
988 read/write operations on these variables. Say Y if you have
989 secure boot enabled and want to expose variables to userspace.
991 config PPC_RTAS_FILTER
992 bool "Enable filtering of RTAS syscalls"
996 The RTAS syscall API has security issues that could be used to
997 compromise system integrity. This option enforces restrictions on the
998 RTAS calls and arguments passed by userspace programs to mitigate
1001 Say Y unless you know what you are doing and the filter is causing
1013 bool "Support for ISA-bus hardware"
1017 Find out whether you have ISA slots on your motherboard. ISA is the
1018 name of a bus system, i.e. the way the CPU talks to the other stuff
1019 inside your box. If you have an Apple machine, say N here; if you
1020 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1021 embedded board, consult your board documentation.
1023 config GENERIC_ISA_DMA
1025 depends on ISA_DMA_API
1028 config PPC_INDIRECT_PCI
1031 default y if 40x || 44x
1041 select ARCH_HAS_DMA_SET_MASK
1042 select PPC_INDIRECT_PCI
1048 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1050 Freescale MPC85xx/MPC86xx power management controller support
1051 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1056 depends on SUSPEND && (44x || 40x)
1058 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1059 It also enables support for two different idle states (idle-wait
1066 bool "Freescale Local Bus support"
1068 Enables reporting of errors from the Freescale local bus
1069 controller. Also contains some common code used by
1070 drivers for specific local bus peripherals.
1074 depends on PPC_83xx || QUICC_ENGINE || CPM2
1076 Freescale General-purpose Timers support
1080 depends on PCI && 8260
1081 select PPC_INDIRECT_PCI
1085 bool "Freescale Embedded SRIO Controller support"
1086 depends on RAPIDIO = y && HAVE_RAPIDIO
1089 Include support for RapidIO controller on Freescale embedded
1090 processors (MPC8548, MPC8641, etc).
1094 config NONSTATIC_KERNEL
1097 menu "Advanced setup"
1100 config ADVANCED_OPTIONS
1101 bool "Prompt for advanced kernel configuration options"
1103 This option will enable prompting for a variety of advanced kernel
1104 configuration options. These options can cause the kernel to not
1105 work if they are set incorrectly, but can be used to optimize certain
1106 aspects of kernel memory management.
1108 Unless you know what you are doing, say N here.
1110 comment "Default settings for advanced configuration options are used"
1111 depends on !ADVANCED_OPTIONS
1113 config LOWMEM_SIZE_BOOL
1114 bool "Set maximum low memory"
1115 depends on ADVANCED_OPTIONS
1117 This option allows you to set the maximum amount of memory which
1118 will be used as "low memory", that is, memory which the kernel can
1119 access directly, without having to set up a kernel virtual mapping.
1120 This can be useful in optimizing the layout of kernel virtual
1123 Say N here unless you know what you are doing.
1126 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1127 default "0x30000000"
1129 config LOWMEM_CAM_NUM_BOOL
1130 bool "Set number of CAMs to use to map low memory"
1131 depends on ADVANCED_OPTIONS && FSL_BOOKE
1133 This option allows you to set the maximum number of CAM slots that
1134 will be used to map low memory. There are a limited number of slots
1135 available and even more limited number that will fit in the L1 MMU.
1136 However, using more entries will allow mapping more low memory. This
1137 can be useful in optimizing the layout of kernel virtual memory.
1139 Say N here unless you know what you are doing.
1141 config LOWMEM_CAM_NUM
1142 depends on FSL_BOOKE
1143 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1146 config DYNAMIC_MEMSTART
1147 bool "Enable page aligned dynamic load address for kernel"
1148 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1149 select NONSTATIC_KERNEL
1151 This option enables the kernel to be loaded at any page aligned
1152 physical address. The kernel creates a mapping from KERNELBASE to
1153 the address where the kernel is loaded. The page size here implies
1154 the TLB page size of the mapping for kernel on the particular platform.
1155 Please refer to the init code for finding the TLB page size.
1157 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1158 kernel image, where the only restriction is the page aligned kernel
1159 load address. When this option is enabled, the compile time physical
1160 address CONFIG_PHYSICAL_START is ignored.
1162 This option is overridden by CONFIG_RELOCATABLE
1164 config PAGE_OFFSET_BOOL
1165 bool "Set custom page offset address"
1166 depends on ADVANCED_OPTIONS
1168 This option allows you to set the kernel virtual address at which
1169 the kernel will map low memory. This can be useful in optimizing
1170 the virtual memory layout of the system.
1172 Say N here unless you know what you are doing.
1175 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1176 default "0xc0000000"
1178 config KERNEL_START_BOOL
1179 bool "Set custom kernel base address"
1180 depends on ADVANCED_OPTIONS
1182 This option allows you to set the kernel virtual address at which
1183 the kernel will be loaded. Normally this should match PAGE_OFFSET
1184 however there are times (like kdump) that one might not want them
1187 Say N here unless you know what you are doing.
1190 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1191 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1192 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1193 default "0xc0000000"
1195 config PHYSICAL_START_BOOL
1196 bool "Set physical address where the kernel is loaded"
1197 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1199 This gives the physical address where the kernel is loaded.
1201 Say N here unless you know what you are doing.
1203 config PHYSICAL_START
1204 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1205 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1206 default "0x00000000"
1208 config PHYSICAL_ALIGN
1210 default "0x04000000" if FSL_BOOKE
1212 This value puts the alignment restrictions on physical address
1213 where kernel is loaded and run from. Kernel is compiled for an
1214 address which meets above alignment restriction.
1216 config TASK_SIZE_BOOL
1217 bool "Set custom user task size"
1218 depends on ADVANCED_OPTIONS
1220 This option allows you to set the amount of virtual address space
1221 allocated to user tasks. This can be useful in optimizing the
1222 virtual memory layout of the system.
1224 Say N here unless you know what you are doing.
1227 hex "Size of user task space" if TASK_SIZE_BOOL
1228 default "0x80000000" if PPC_8xx
1229 default "0xb0000000" if PPC_BOOK3S_32 && STRICT_KERNEL_RWX
1230 default "0xc0000000"
1234 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1237 default "0xc000000000000000"
1240 default "0xc000000000000000"
1241 config PHYSICAL_START
1243 default "0x00000000"
1249 config PPC_LIB_RHEAP
1252 source "arch/powerpc/kvm/Kconfig"
1254 source "kernel/livepatch/Kconfig"