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
65 int "Number of virtual interrupt numbers"
69 This defines the number of virtual interrupt numbers the kernel
70 can manage. Virtual interrupt numbers are what you see in
71 /proc/interrupts. If you configure your system to have too few,
72 drivers will fail to load or worse - handle with care.
76 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
81 depends on HARDLOCKUP_DETECTOR
82 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
85 This is a placeholder when the powerpc hardlockup detector
86 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
87 seleted via the generic lockup detector menu which is why we
88 have no standalone config option for it here.
90 config STACKTRACE_SUPPORT
94 config TRACE_IRQFLAGS_SUPPORT
98 config LOCKDEP_SUPPORT
102 config GENERIC_LOCKBREAK
105 depends on SMP && PREEMPTION
107 config GENERIC_HWEIGHT
115 # Please keep this list sorted alphabetically.
117 select ARCH_32BIT_OFF_T if PPC32
118 select ARCH_HAS_DEBUG_VIRTUAL
119 select ARCH_HAS_DEBUG_VM_PGTABLE
120 select ARCH_HAS_DEVMEM_IS_ALLOWED
121 select ARCH_HAS_ELF_RANDOMIZE
122 select ARCH_HAS_FORTIFY_SOURCE
123 select ARCH_HAS_GCOV_PROFILE_ALL
125 select ARCH_HAS_HUGEPD if HUGETLB_PAGE
126 select ARCH_HAS_MEMREMAP_COMPAT_ALIGN
127 select ARCH_HAS_MMIOWB if PPC64
128 select ARCH_HAS_PHYS_TO_DMA
129 select ARCH_HAS_PMEM_API
130 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
131 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
132 select ARCH_HAS_PTE_SPECIAL
133 select ARCH_HAS_MEMBARRIER_CALLBACKS
134 select ARCH_HAS_MEMBARRIER_SYNC_CORE
135 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
136 select ARCH_HAS_STRICT_KERNEL_RWX if (PPC32 && !HIBERNATION)
137 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
138 select ARCH_HAS_UACCESS_FLUSHCACHE
139 select ARCH_HAS_UACCESS_MCSAFE if PPC64
140 select ARCH_HAS_UBSAN_SANITIZE_ALL
141 select ARCH_HAVE_NMI_SAFE_CMPXCHG
142 select ARCH_KEEP_MEMBLOCK
143 select ARCH_MIGHT_HAVE_PC_PARPORT
144 select ARCH_MIGHT_HAVE_PC_SERIO
145 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
146 select ARCH_SUPPORTS_ATOMIC_RMW
147 select ARCH_USE_BUILTIN_BSWAP
148 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
149 select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS
150 select ARCH_USE_QUEUED_SPINLOCKS if PPC_QUEUED_SPINLOCKS
151 select ARCH_WANT_IPC_PARSE_VERSION
152 select ARCH_WEAK_RELEASE_ACQUIRE
154 select BUILDTIME_TABLE_SORT
155 select CLONE_BACKWARDS
156 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
157 select DMA_OPS if PPC64
158 select DMA_OPS_BYPASS if PPC64
159 select DYNAMIC_FTRACE if FUNCTION_TRACER
160 select EDAC_ATOMIC_SCRUB
162 select GENERIC_ATOMIC64 if PPC32
163 select GENERIC_CLOCKEVENTS
164 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
165 select GENERIC_CMOS_UPDATE
166 select GENERIC_CPU_AUTOPROBE
167 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
168 select GENERIC_EARLY_IOREMAP
169 select GENERIC_IRQ_SHOW
170 select GENERIC_IRQ_SHOW_LEVEL
171 select GENERIC_PCI_IOMAP if PCI
172 select GENERIC_SMP_IDLE_THREAD
173 select GENERIC_STRNCPY_FROM_USER
174 select GENERIC_STRNLEN_USER
175 select GENERIC_TIME_VSYSCALL
176 select HAVE_ARCH_AUDITSYSCALL
177 select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
178 select HAVE_ARCH_JUMP_LABEL
179 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
180 select HAVE_ARCH_KASAN_VMALLOC if PPC32 && PPC_PAGE_SHIFT <= 14
181 select HAVE_ARCH_KGDB
182 select HAVE_ARCH_MMAP_RND_BITS
183 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
184 select HAVE_ARCH_NVRAM_OPS
185 select HAVE_ARCH_SECCOMP_FILTER
186 select HAVE_ARCH_TRACEHOOK
187 select HAVE_ASM_MODVERSIONS
188 select HAVE_C_RECORDMCOUNT
189 select HAVE_CBPF_JIT if !PPC64
190 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
191 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
192 select HAVE_CONTEXT_TRACKING if PPC64
193 select HAVE_TIF_NOHZ if PPC64
194 select HAVE_DEBUG_KMEMLEAK
195 select HAVE_DEBUG_STACKOVERFLOW
196 select HAVE_DYNAMIC_FTRACE
197 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
198 select HAVE_EBPF_JIT if PPC64
199 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
201 select HAVE_FTRACE_MCOUNT_RECORD
202 select HAVE_FUNCTION_ERROR_INJECTION
203 select HAVE_FUNCTION_GRAPH_TRACER
204 select HAVE_FUNCTION_TRACER
205 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
206 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
208 select HAVE_IOREMAP_PROT
209 select HAVE_IRQ_EXIT_ON_IRQ_STACK
210 select HAVE_KERNEL_GZIP
211 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
212 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
213 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
215 select HAVE_KPROBES_ON_FTRACE
216 select HAVE_KRETPROBES
217 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
218 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
219 select HAVE_MOD_ARCH_SPECIFIC
220 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
221 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
223 select HAVE_OPTPROBES if PPC64
224 select HAVE_PERF_EVENTS
225 select HAVE_PERF_EVENTS_NMI if PPC64
226 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
227 select HAVE_PERF_REGS
228 select HAVE_PERF_USER_STACK_DUMP
229 select MMU_GATHER_RCU_TABLE_FREE
230 select MMU_GATHER_PAGE_SIZE
231 select HAVE_REGS_AND_STACK_ACCESS_API
232 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
233 select HAVE_SYSCALL_TRACEPOINTS
234 select HAVE_VIRT_CPU_ACCOUNTING
235 select HAVE_IRQ_TIME_ACCOUNTING
237 select IOMMU_HELPER if PPC64
239 select IRQ_FORCED_THREADING
240 select MODULES_USE_ELF_RELA
241 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
242 select NEED_SG_DMA_LENGTH
244 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
245 select OF_EARLY_FLATTREE
246 select OLD_SIGACTION if PPC32
247 select OLD_SIGSUSPEND
248 select PCI_DOMAINS if PCI
249 select PCI_SYSCALL if PCI
250 select PPC_DAWR if PPC64
253 select SYSCTL_EXCEPTION_TRACE
254 select THREAD_INFO_IN_TASK
255 select VIRT_TO_BUS if !PPC64
257 # Please keep this list sorted alphabetically.
260 config PPC_BARRIER_NOSPEC
263 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
274 bool "Enable support for 32bit binaries"
276 default y if !CPU_LITTLE_ENDIAN
277 select COMPAT_BINFMT_ELF
278 select ARCH_WANT_OLD_COMPAT_IPC
279 select COMPAT_OLD_SIGACTION
281 config SYSVIPC_COMPAT
283 depends on COMPAT && SYSVIPC
286 config SCHED_OMIT_FRAME_POINTER
290 config ARCH_MAY_HAVE_PC_FDC
294 config PPC_UDBG_16550
297 config GENERIC_TBSYNC
299 default y if PPC32 && SMP
310 config SYS_SUPPORTS_APM_EMULATION
311 default y if PMAC_APM_EMU
317 Used to allow a board to specify it wants an ePAPR compliant wrapper.
319 config DEFAULT_UIMAGE
322 Used to allow a board to specify it wants a uImage built by default
324 config ARCH_HIBERNATION_POSSIBLE
328 config ARCH_SUSPEND_POSSIBLE
330 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
331 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
334 config ARCH_SUSPEND_NONZERO_CPU
336 depends on PPC_POWERNV || PPC_PSERIES
338 config PPC_DCR_NATIVE
346 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
349 config PPC_OF_PLATFORM_PCI
352 depends on PPC64 # not supported on 32 bits yet
354 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
355 depends on PPC32 || PPC_BOOK3S_64
358 config ARCH_SUPPORTS_UPROBES
361 config PPC_ADV_DEBUG_REGS
363 depends on 40x || BOOKE
366 config PPC_ADV_DEBUG_IACS
368 depends on PPC_ADV_DEBUG_REGS
372 config PPC_ADV_DEBUG_DACS
374 depends on PPC_ADV_DEBUG_REGS
377 config PPC_ADV_DEBUG_DVCS
379 depends on PPC_ADV_DEBUG_REGS
383 config PPC_ADV_DEBUG_DAC_RANGE
385 depends on PPC_ADV_DEBUG_REGS && 44x
393 default y if PPC_BOOK3E_64
395 config PGTABLE_LEVELS
400 source "arch/powerpc/sysdev/Kconfig"
401 source "arch/powerpc/platforms/Kconfig"
403 menu "Kernel options"
406 bool "High memory support"
409 source "kernel/Kconfig.hz"
411 config HUGETLB_PAGE_SIZE_VARIABLE
413 depends on HUGETLB_PAGE && PPC_BOOK3S_64
416 config MATH_EMULATION
417 bool "Math emulation"
418 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
420 Some PowerPC chips designed for embedded applications do not have
421 a floating-point unit and therefore do not implement the
422 floating-point instructions in the PowerPC instruction set. If you
423 say Y here, the kernel will include code to emulate a floating-point
424 unit, which will allow programs that use floating-point
427 This is also useful to emulate missing (optional) instructions
428 such as fsqrt on cores that do have an FPU but do not implement
429 them (such as Freescale BookE).
432 prompt "Math emulation options"
433 default MATH_EMULATION_FULL
434 depends on MATH_EMULATION
436 config MATH_EMULATION_FULL
437 bool "Emulate all the floating point instructions"
439 Select this option will enable the kernel to support to emulate
440 all the floating point instructions. If your SoC doesn't have
441 a FPU, you should select this.
443 config MATH_EMULATION_HW_UNIMPLEMENTED
444 bool "Just emulate the FPU unimplemented instructions"
446 Select this if you know there does have a hardware FPU on your
447 SoC, but some floating point instructions are not implemented by that.
451 config PPC_TRANSACTIONAL_MEM
452 bool "Transactional Memory support for POWERPC"
453 depends on PPC_BOOK3S_64
458 Support user-mode Transactional Memory on POWERPC.
461 bool "Ultravisor support"
462 depends on KVM_BOOK3S_HV_POSSIBLE
463 depends on DEVICE_PRIVATE
466 This option paravirtualizes the kernel to run in POWER platforms that
467 supports the Protected Execution Facility (PEF). On such platforms,
468 the ultravisor firmware runs at a privilege level above the
473 config LD_HEAD_STUB_CATCH
474 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
477 Very large kernels can cause linker branch stubs to be generated by
478 code in head_64.S, which moves the head text sections out of their
479 specified location. This option can work around the problem.
483 config MPROFILE_KERNEL
484 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
485 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
488 bool "Support for enabling/disabling CPUs"
489 depends on SMP && (PPC_PSERIES || \
490 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
492 Say Y here to be able to disable and re-enable individual
493 CPUs at runtime on SMP machines.
495 Say N if you are unsure.
497 config PPC_QUEUED_SPINLOCKS
498 bool "Queued spinlocks"
501 Say Y here to use queued spinlocks which give better scalability and
502 fairness on large SMP and NUMA systems without harming single threaded
505 This option is currently experimental, the code is more complex and
506 less tested so it defaults to "N" for the moment.
510 config ARCH_CPU_PROBE_RELEASE
512 depends on HOTPLUG_CPU
514 config ARCH_ENABLE_MEMORY_HOTPLUG
517 config ARCH_ENABLE_MEMORY_HOTREMOVE
520 config PPC64_SUPPORTS_MEMORY_FAILURE
521 bool "Add support for memory hwpoison"
522 depends on PPC_BOOK3S_64
523 default "y" if PPC_POWERNV
524 select ARCH_SUPPORTS_MEMORY_FAILURE
527 bool "kexec system call"
528 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
531 kexec is a system call that implements the ability to shutdown your
532 current kernel, and to start another kernel. It is like a reboot
533 but it is independent of the system firmware. And like a reboot
534 you can start any kernel with it, not just Linux.
536 The name comes from the similarity to the exec system call.
538 It is an ongoing process to be certain the hardware in a machine
539 is properly shutdown, so do not be surprised if this code does not
540 initially work for you. As of this writing the exact hardware
541 interface is strongly in flux, so no good recommendation can be
545 bool "kexec file based system call"
547 select HAVE_IMA_KEXEC
552 depends on CRYPTO_SHA256=y
554 This is a new version of the kexec system call. This call is
555 file based and takes in file descriptors as system call arguments
556 for kernel and initramfs as opposed to a list of segments as is the
557 case for the older kexec call.
559 config ARCH_HAS_KEXEC_PURGATORY
563 bool "Build a relocatable kernel"
564 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
565 select NONSTATIC_KERNEL
566 select MODULE_REL_CRCS if MODVERSIONS
568 This builds a kernel image that is capable of running at the
569 location the kernel is loaded at. For ppc32, there is no any
570 alignment restrictions, and this feature is a superset of
571 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
572 16k-aligned base address. The kernel is linked as a
573 position-independent executable (PIE) and contains dynamic relocations
574 which are processed early in the bootup process.
576 One use is for the kexec on panic case where the recovery kernel
577 must live at a different physical address than the primary
580 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
581 it has been loaded at and the compile time physical addresses
582 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
583 setting can still be useful to bootwrappers that need to know the
584 load address of the kernel (eg. u-boot/mkimage).
586 config RANDOMIZE_BASE
587 bool "Randomize the address of the kernel image"
588 depends on (FSL_BOOKE && FLATMEM && PPC32)
589 depends on RELOCATABLE
591 Randomizes the virtual address at which the kernel image is
592 loaded, as a security feature that deters exploit attempts
593 relying on knowledge of the location of kernel internals.
597 config RELOCATABLE_TEST
598 bool "Test relocatable kernel"
599 depends on (PPC64 && RELOCATABLE)
601 This runs the relocatable kernel at the address it was initially
602 loaded at, which tends to be non-zero and therefore test the
606 bool "Build a dump capture kernel"
607 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
608 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
610 Build a kernel suitable for use as a dump capture kernel.
611 The same kernel binary can be used as production kernel and dump
615 bool "Firmware-assisted dump"
616 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
620 A robust mechanism to get reliable kernel crash dump with
621 assistance from firmware. This approach does not use kexec,
622 instead firmware assists in booting the capture kernel
623 while preserving memory contents. Firmware-assisted dump
624 is meant to be a kdump replacement offering robustness and
625 speed not possible without system firmware assistance.
627 If unsure, say "y". Only special kernels like petitboot may
628 need to say "N" here.
630 config PRESERVE_FA_DUMP
631 bool "Preserve Firmware-assisted dump"
632 depends on PPC64 && PPC_POWERNV && !FA_DUMP
634 On a kernel with FA_DUMP disabled, this option helps to preserve
635 crash data from a previously crash'ed kernel. Useful when the next
636 memory preserving kernel boot would process this crash data.
637 Petitboot kernel is the typical usecase for this option.
640 bool "Export OPAL memory as /sys/firmware/opal/core"
641 depends on PPC64 && PPC_POWERNV
643 This option uses the MPIPL support in firmware to provide an
644 ELF core of OPAL memory after a crash. The ELF core is exported
645 as /sys/firmware/opal/core file which is helpful in debugging
646 OPAL crashes using GDB.
649 bool "Distribute interrupts on all CPUs by default"
652 This option gives the kernel permission to distribute IRQs across
653 multiple CPUs. Saying N here will route all IRQs to the first
654 CPU. Generally saying Y is safe, although some problems have been
655 reported with SMP Power Macintoshes with this option enabled.
660 default y if SMP && PPC_PSERIES
666 depends on NEED_MULTIPLE_NODES
668 config USE_PERCPU_NUMA_NODE_ID
672 config HAVE_MEMORYLESS_NODES
676 config ARCH_SELECT_MEMORY_MODEL
680 config ARCH_FLATMEM_ENABLE
682 depends on (PPC64 && !NUMA) || PPC32
684 config ARCH_SPARSEMEM_ENABLE
687 select SPARSEMEM_VMEMMAP_ENABLE
689 config ARCH_SPARSEMEM_DEFAULT
691 depends on PPC_BOOK3S_64
693 config SYS_SUPPORTS_HUGETLBFS
696 config ILLEGAL_POINTER_VALUE
698 # This is roughly half way between the top of user space and the bottom
699 # of kernel space, which seems about as good as we can get.
700 default 0x5deadbeef0000000 if PPC64
703 config ARCH_MEMORY_PROBE
705 depends on MEMORY_HOTPLUG
708 bool "Using standard binutils settings"
712 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
713 Note, that kernel will be able to run only those applications,
714 which had been compiled using binutils later than 2.17.50.0.3 with
715 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
716 the older binutils, you can patch them with a trivial patch, which
717 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
723 Select the kernel logical page size. Increasing the page size
724 will reduce software overhead at each page boundary, allow
725 hardware prefetch mechanisms to be more effective, and allow
726 larger dma transfers increasing IO efficiency and reducing
727 overhead. However the utilization of memory will increase.
728 For example, each cached file will using a multiple of the
729 page size to hold its contents and the difference between the
730 end of file and the end of page is wasted.
732 Some dedicated systems, such as software raid serving with
733 accelerated calculations, have shown significant increases.
735 If you configure a 64 bit kernel for 64k pages but the
736 processor does not support them, then the kernel will simulate
737 them with 4k pages, loading them on demand, but with the
738 reduced software overhead and larger internal fragmentation.
739 For the 32 bit kernel, a large page option will not be offered
740 unless it is supported by the configured processor.
742 If unsure, choose 4K_PAGES.
746 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
750 depends on 44x || PPC_8xx
754 depends on 44x || PPC_BOOK3S_64
755 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
757 config PPC_256K_PAGES
758 bool "256k page size"
759 depends on 44x && !STDBINUTILS
761 Make the page size 256k.
763 As the ELF standard only requires alignment to support page
764 sizes up to 64k, you will need to compile all of your user
765 space applications with a non-standard binutils settings
766 (see the STDBINUTILS description for details).
768 Say N unless you know what you are doing.
772 config PPC_PAGE_SHIFT
774 default 18 if PPC_256K_PAGES
775 default 16 if PPC_64K_PAGES
776 default 14 if PPC_16K_PAGES
780 int "Thread shift" if EXPERT
782 default "15" if PPC_256K_PAGES
783 default "14" if PPC64
784 default "14" if KASAN
787 Used to define the stack size. The default is almost always what you
788 want. Only change this if you know what you are doing.
790 config DATA_SHIFT_BOOL
791 bool "Set custom data alignment"
792 depends on ADVANCED_OPTIONS
793 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC
794 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && \
795 (!PIN_TLB_TEXT || !STRICT_KERNEL_RWX))
797 This option allows you to set the kernel data alignment. When
798 RAM is mapped by blocks, the alignment needs to fit the size and
799 number of possible blocks. The default should be OK for most configs.
801 Say N here unless you know what you are doing.
804 int "Data shift" if DATA_SHIFT_BOOL
805 default 24 if STRICT_KERNEL_RWX && PPC64
806 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_BOOK3S_32
807 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_8xx
808 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
809 default 18 if DEBUG_PAGEALLOC && PPC_BOOK3S_32
810 default 23 if STRICT_KERNEL_RWX && PPC_8xx
811 default 23 if DEBUG_PAGEALLOC && PPC_8xx && PIN_TLB_DATA
812 default 19 if DEBUG_PAGEALLOC && PPC_8xx
813 default PPC_PAGE_SHIFT
815 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
816 Smaller is the alignment, greater is the number of necessary DBATs.
818 On 8xx, large pages (512kb or 8M) are used to map kernel linear
819 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
820 in that case. If PIN_TLB is selected, it must be aligned to 8M as
821 8M pages will be pinned.
823 config FORCE_MAX_ZONEORDER
824 int "Maximum zone order"
825 range 8 9 if PPC64 && PPC_64K_PAGES
826 default "9" if PPC64 && PPC_64K_PAGES
827 range 13 13 if PPC64 && !PPC_64K_PAGES
828 default "13" if PPC64 && !PPC_64K_PAGES
829 range 9 64 if PPC32 && PPC_16K_PAGES
830 default "9" if PPC32 && PPC_16K_PAGES
831 range 7 64 if PPC32 && PPC_64K_PAGES
832 default "7" if PPC32 && PPC_64K_PAGES
833 range 5 64 if PPC32 && PPC_256K_PAGES
834 default "5" if PPC32 && PPC_256K_PAGES
838 The kernel memory allocator divides physically contiguous memory
839 blocks into "zones", where each zone is a power of two number of
840 pages. This option selects the largest power of two that the kernel
841 keeps in the memory allocator. If you need to allocate very large
842 blocks of physically contiguous memory, then you may need to
845 This config option is actually maximum order plus one. For example,
846 a value of 11 means that the largest free memory block is 2^10 pages.
848 The page size is not necessarily 4KB. For example, on 64-bit
849 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
850 this in mind when choosing a value for this option.
852 config PPC_SUBPAGE_PROT
853 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
855 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
857 This option adds support for system call to allow user programs
858 to set access permissions (read/write, readonly, or no access)
859 on the 4k subpages of each 64k page.
861 If unsure, say N here.
863 config PPC_COPRO_BASE
867 bool "SMT (Hyperthreading) scheduler support"
868 depends on PPC64 && SMP
870 SMT scheduler support improves the CPU scheduler's decision making
871 when dealing with POWER5 cpus at a cost of slightly increased
872 overhead in some places. If unsure say N here.
874 config PPC_DENORMALISATION
875 bool "PowerPC denormalisation exception handling"
876 depends on PPC_BOOK3S_64
877 default "y" if PPC_POWERNV
879 Add support for handling denormalisation of single precision
880 values. Useful for bare metal only. If unsure say Y here.
883 string "Initial kernel command string"
886 On some platforms, there is currently no way for the boot loader to
887 pass arguments to the kernel. For these platforms, you can supply
888 some command-line options at build time by entering them here. In
889 most cases you will need to specify the root device here.
892 prompt "Kernel command line type" if CMDLINE != ""
893 default CMDLINE_FROM_BOOTLOADER
895 config CMDLINE_FROM_BOOTLOADER
896 bool "Use bootloader kernel arguments if available"
898 Uses the command-line options passed by the boot loader. If
899 the boot loader doesn't provide any, the default kernel command
900 string provided in CMDLINE will be used.
902 config CMDLINE_EXTEND
903 bool "Extend bootloader kernel arguments"
905 The command-line arguments provided by the boot loader will be
906 appended to the default kernel command string.
909 bool "Always use the default kernel command string"
911 Always use the default kernel command string, even if the boot
912 loader passes other arguments to the kernel.
913 This is useful if you cannot or don't want to change the
914 command-line options your boot loader passes to the kernel.
919 string "Additional default image types"
921 List additional targets to be built by the bootwrapper here (separated
922 by spaces). This is useful for targets that depend of device tree
923 files in the .dts directory.
925 Targets in this list will be build as part of the default build
926 target, or when the user does a 'make zImage' or a
927 'make zImage.initrd'.
929 If unsure, leave blank
931 config ARCH_WANTS_FREEZER_CONTROL
935 source "kernel/power/Kconfig"
938 bool "Enable seccomp to safely compute untrusted bytecode"
942 This kernel feature is useful for number crunching applications
943 that may need to compute untrusted bytecode during their
944 execution. By using pipes or other transports made available to
945 the process as file descriptors supporting the read/write
946 syscalls, it's possible to isolate those applications in
947 their own address space using seccomp. Once seccomp is
948 enabled via /proc/<pid>/seccomp, it cannot be disabled
949 and the task is only allowed to execute a few safe syscalls
950 defined by each seccomp mode.
952 If unsure, say Y. Only embedded should say N here.
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
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.
1001 bool "Support for ISA-bus hardware"
1005 Find out whether you have ISA slots on your motherboard. ISA is the
1006 name of a bus system, i.e. the way the CPU talks to the other stuff
1007 inside your box. If you have an Apple machine, say N here; if you
1008 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1009 embedded board, consult your board documentation.
1011 config GENERIC_ISA_DMA
1013 depends on ISA_DMA_API
1016 config PPC_INDIRECT_PCI
1019 default y if 40x || 44x
1029 select ARCH_HAS_DMA_SET_MASK
1030 select PPC_INDIRECT_PCI
1036 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1038 Freescale MPC85xx/MPC86xx power management controller support
1039 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1044 depends on SUSPEND && (44x || 40x)
1046 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1047 It also enables support for two different idle states (idle-wait
1054 bool "Freescale Local Bus support"
1056 Enables reporting of errors from the Freescale local bus
1057 controller. Also contains some common code used by
1058 drivers for specific local bus peripherals.
1062 depends on PPC_83xx || QUICC_ENGINE || CPM2
1064 Freescale General-purpose Timers support
1068 depends on PCI && 8260
1069 select PPC_INDIRECT_PCI
1073 bool "Freescale Embedded SRIO Controller support"
1074 depends on RAPIDIO = y && HAVE_RAPIDIO
1077 Include support for RapidIO controller on Freescale embedded
1078 processors (MPC8548, MPC8641, etc).
1082 config NONSTATIC_KERNEL
1085 menu "Advanced setup"
1088 config ADVANCED_OPTIONS
1089 bool "Prompt for advanced kernel configuration options"
1091 This option will enable prompting for a variety of advanced kernel
1092 configuration options. These options can cause the kernel to not
1093 work if they are set incorrectly, but can be used to optimize certain
1094 aspects of kernel memory management.
1096 Unless you know what you are doing, say N here.
1098 comment "Default settings for advanced configuration options are used"
1099 depends on !ADVANCED_OPTIONS
1101 config LOWMEM_SIZE_BOOL
1102 bool "Set maximum low memory"
1103 depends on ADVANCED_OPTIONS
1105 This option allows you to set the maximum amount of memory which
1106 will be used as "low memory", that is, memory which the kernel can
1107 access directly, without having to set up a kernel virtual mapping.
1108 This can be useful in optimizing the layout of kernel virtual
1111 Say N here unless you know what you are doing.
1114 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1115 default "0x30000000"
1117 config LOWMEM_CAM_NUM_BOOL
1118 bool "Set number of CAMs to use to map low memory"
1119 depends on ADVANCED_OPTIONS && FSL_BOOKE
1121 This option allows you to set the maximum number of CAM slots that
1122 will be used to map low memory. There are a limited number of slots
1123 available and even more limited number that will fit in the L1 MMU.
1124 However, using more entries will allow mapping more low memory. This
1125 can be useful in optimizing the layout of kernel virtual memory.
1127 Say N here unless you know what you are doing.
1129 config LOWMEM_CAM_NUM
1130 depends on FSL_BOOKE
1131 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1134 config DYNAMIC_MEMSTART
1135 bool "Enable page aligned dynamic load address for kernel"
1136 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1137 select NONSTATIC_KERNEL
1139 This option enables the kernel to be loaded at any page aligned
1140 physical address. The kernel creates a mapping from KERNELBASE to
1141 the address where the kernel is loaded. The page size here implies
1142 the TLB page size of the mapping for kernel on the particular platform.
1143 Please refer to the init code for finding the TLB page size.
1145 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1146 kernel image, where the only restriction is the page aligned kernel
1147 load address. When this option is enabled, the compile time physical
1148 address CONFIG_PHYSICAL_START is ignored.
1150 This option is overridden by CONFIG_RELOCATABLE
1152 config PAGE_OFFSET_BOOL
1153 bool "Set custom page offset address"
1154 depends on ADVANCED_OPTIONS
1156 This option allows you to set the kernel virtual address at which
1157 the kernel will map low memory. This can be useful in optimizing
1158 the virtual memory layout of the system.
1160 Say N here unless you know what you are doing.
1163 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1164 default "0xc0000000"
1166 config KERNEL_START_BOOL
1167 bool "Set custom kernel base address"
1168 depends on ADVANCED_OPTIONS
1170 This option allows you to set the kernel virtual address at which
1171 the kernel will be loaded. Normally this should match PAGE_OFFSET
1172 however there are times (like kdump) that one might not want them
1175 Say N here unless you know what you are doing.
1178 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1179 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1180 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1181 default "0xc0000000"
1183 config PHYSICAL_START_BOOL
1184 bool "Set physical address where the kernel is loaded"
1185 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1187 This gives the physical address where the kernel is loaded.
1189 Say N here unless you know what you are doing.
1191 config PHYSICAL_START
1192 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1193 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1194 default "0x00000000"
1196 config PHYSICAL_ALIGN
1198 default "0x04000000" if FSL_BOOKE
1200 This value puts the alignment restrictions on physical address
1201 where kernel is loaded and run from. Kernel is compiled for an
1202 address which meets above alignment restriction.
1204 config TASK_SIZE_BOOL
1205 bool "Set custom user task size"
1206 depends on ADVANCED_OPTIONS
1208 This option allows you to set the amount of virtual address space
1209 allocated to user tasks. This can be useful in optimizing the
1210 virtual memory layout of the system.
1212 Say N here unless you know what you are doing.
1215 hex "Size of user task space" if TASK_SIZE_BOOL
1216 default "0x80000000" if PPC_8xx
1217 default "0xb0000000" if PPC_BOOK3S_32 && STRICT_KERNEL_RWX
1218 default "0xc0000000"
1222 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1225 default "0xc000000000000000"
1228 default "0xc000000000000000"
1229 config PHYSICAL_START
1231 default "0x00000000"
1237 config PPC_LIB_RHEAP
1240 source "arch/powerpc/kvm/Kconfig"
1242 source "kernel/livepatch/Kconfig"