1 # SPDX-License-Identifier: GPL-2.0
2 source "arch/powerpc/platforms/Kconfig.cputype"
20 config ARCH_MMAP_RND_BITS_MAX
21 # On Book3S 64, the default virtual address space for 64-bit processes
22 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
23 # 32T of address space (2^45), which should ensure a reasonable gap
24 # between bottom-up and top-down allocations for applications that
25 # consume "normal" amounts of address space. Book3S 64 only supports 64K
27 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
28 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K)
30 # On all other 64-bit platforms (currently only Book3E), the virtual
31 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
32 # of address space (2^44). Only 4K page sizes are supported.
33 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K)
35 # For 32-bit, use the compat values, as they're the same.
36 default ARCH_MMAP_RND_COMPAT_BITS_MAX
38 config ARCH_MMAP_RND_BITS_MIN
39 # Allow randomisation to consume up to 1GB of address space (2^30).
40 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K)
41 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K)
43 # For 32-bit, use the compat values, as they're the same.
44 default ARCH_MMAP_RND_COMPAT_BITS_MIN
46 config ARCH_MMAP_RND_COMPAT_BITS_MAX
47 # Total virtual address space for 32-bit processes is 2^31 (2GB).
48 # Allow randomisation to consume up to 512MB of address space (2^29).
49 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K)
50 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K)
51 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K)
52 default 17 # 17 = 29 (512MB) - 12 (4K)
54 config ARCH_MMAP_RND_COMPAT_BITS_MIN
55 # Total virtual address space for 32-bit processes is 2^31 (2GB).
56 # Allow randomisation to consume up to 8MB of address space (2^23).
57 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K)
58 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K)
59 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K)
60 default 11 # 11 = 23 (8MB) - 12 (4K)
62 config HAVE_SETUP_PER_CPU_AREA
65 config NEED_PER_CPU_EMBED_FIRST_CHUNK
69 int "Number of virtual interrupt numbers"
73 This defines the number of virtual interrupt numbers the kernel
74 can manage. Virtual interrupt numbers are what you see in
75 /proc/interrupts. If you configure your system to have too few,
76 drivers will fail to load or worse - handle with care.
80 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
85 depends on HARDLOCKUP_DETECTOR
86 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
89 This is a placeholder when the powerpc hardlockup detector
90 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
91 seleted via the generic lockup detector menu which is why we
92 have no standalone config option for it here.
94 config STACKTRACE_SUPPORT
98 config TRACE_IRQFLAGS_SUPPORT
102 config LOCKDEP_SUPPORT
106 config GENERIC_LOCKBREAK
109 depends on SMP && PREEMPT
111 config GENERIC_HWEIGHT
119 # Please keep this list sorted alphabetically.
121 select ARCH_32BIT_OFF_T if PPC32
122 select ARCH_HAS_DEBUG_VIRTUAL
123 select ARCH_HAS_DEVMEM_IS_ALLOWED
124 select ARCH_HAS_ELF_RANDOMIZE
125 select ARCH_HAS_FORTIFY_SOURCE
126 select ARCH_HAS_GCOV_PROFILE_ALL
128 select ARCH_HAS_HUGEPD if HUGETLB_PAGE
129 select ARCH_HAS_MMIOWB if PPC64
130 select ARCH_HAS_PHYS_TO_DMA
131 select ARCH_HAS_PMEM_API
132 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
133 select ARCH_HAS_PTE_SPECIAL
134 select ARCH_HAS_MEMBARRIER_CALLBACKS
135 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
136 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !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_WANT_IPC_PARSE_VERSION
150 select ARCH_WEAK_RELEASE_ACQUIRE
152 select BUILDTIME_EXTABLE_SORT
153 select CLONE_BACKWARDS
154 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
155 select DYNAMIC_FTRACE if FUNCTION_TRACER
156 select EDAC_ATOMIC_SCRUB
158 select GENERIC_ATOMIC64 if PPC32
159 select GENERIC_CLOCKEVENTS
160 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
161 select GENERIC_CMOS_UPDATE
162 select GENERIC_CPU_AUTOPROBE
163 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
164 select GENERIC_EARLY_IOREMAP
165 select GENERIC_IRQ_SHOW
166 select GENERIC_IRQ_SHOW_LEVEL
167 select GENERIC_PCI_IOMAP if PCI
168 select GENERIC_SMP_IDLE_THREAD
169 select GENERIC_STRNCPY_FROM_USER
170 select GENERIC_STRNLEN_USER
171 select GENERIC_TIME_VSYSCALL
172 select HAVE_ARCH_AUDITSYSCALL
173 select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
174 select HAVE_ARCH_JUMP_LABEL
175 select HAVE_ARCH_KASAN if PPC32
176 select HAVE_ARCH_KGDB
177 select HAVE_ARCH_MMAP_RND_BITS
178 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
179 select HAVE_ARCH_NVRAM_OPS
180 select HAVE_ARCH_SECCOMP_FILTER
181 select HAVE_ARCH_TRACEHOOK
182 select HAVE_ASM_MODVERSIONS
183 select HAVE_C_RECORDMCOUNT
184 select HAVE_CBPF_JIT if !PPC64
185 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
186 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
187 select HAVE_CONTEXT_TRACKING if PPC64
188 select HAVE_COPY_THREAD_TLS
189 select HAVE_DEBUG_KMEMLEAK
190 select HAVE_DEBUG_STACKOVERFLOW
191 select HAVE_DYNAMIC_FTRACE
192 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
193 select HAVE_EBPF_JIT if PPC64
194 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
196 select HAVE_FTRACE_MCOUNT_RECORD
197 select HAVE_FUNCTION_ERROR_INJECTION
198 select HAVE_FUNCTION_GRAPH_TRACER
199 select HAVE_FUNCTION_TRACER
200 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
201 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
203 select HAVE_IOREMAP_PROT
204 select HAVE_IRQ_EXIT_ON_IRQ_STACK
205 select HAVE_KERNEL_GZIP
206 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
207 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
208 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
210 select HAVE_KPROBES_ON_FTRACE
211 select HAVE_KRETPROBES
212 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
213 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
214 select HAVE_MEMBLOCK_NODE_MAP
215 select HAVE_MOD_ARCH_SPECIFIC
216 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
217 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
219 select HAVE_OPTPROBES if PPC64
220 select HAVE_PERF_EVENTS
221 select HAVE_PERF_EVENTS_NMI if PPC64
222 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
223 select HAVE_PERF_REGS
224 select HAVE_PERF_USER_STACK_DUMP
225 select HAVE_RCU_TABLE_FREE if SMP
226 select HAVE_RCU_TABLE_NO_INVALIDATE if HAVE_RCU_TABLE_FREE
227 select HAVE_MMU_GATHER_PAGE_SIZE
228 select HAVE_REGS_AND_STACK_ACCESS_API
229 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
230 select HAVE_SYSCALL_TRACEPOINTS
231 select HAVE_VIRT_CPU_ACCOUNTING
232 select HAVE_IRQ_TIME_ACCOUNTING
234 select IOMMU_HELPER if PPC64
236 select IRQ_FORCED_THREADING
237 select MODULES_USE_ELF_RELA
238 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
239 select NEED_SG_DMA_LENGTH
241 select OF_EARLY_FLATTREE
242 select OLD_SIGACTION if PPC32
243 select OLD_SIGSUSPEND
244 select PCI_DOMAINS if PCI
245 select PCI_SYSCALL if PCI
246 select PPC_DAWR if PPC64
249 select SYSCTL_EXCEPTION_TRACE
250 select THREAD_INFO_IN_TASK
251 select VIRT_TO_BUS if !PPC64
253 # Please keep this list sorted alphabetically.
256 config PPC_BARRIER_NOSPEC
259 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
272 select COMPAT_BINFMT_ELF
273 select ARCH_WANT_OLD_COMPAT_IPC
274 select COMPAT_OLD_SIGACTION
276 config SYSVIPC_COMPAT
278 depends on COMPAT && SYSVIPC
281 config SCHED_OMIT_FRAME_POINTER
285 config ARCH_MAY_HAVE_PC_FDC
289 config PPC_UDBG_16550
292 config GENERIC_TBSYNC
294 default y if PPC32 && SMP
305 config SYS_SUPPORTS_APM_EMULATION
306 default y if PMAC_APM_EMU
312 Used to allow a board to specify it wants an ePAPR compliant wrapper.
314 config DEFAULT_UIMAGE
317 Used to allow a board to specify it wants a uImage built by default
319 config ARCH_HIBERNATION_POSSIBLE
323 config ARCH_SUSPEND_POSSIBLE
325 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
326 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
329 config ARCH_SUSPEND_NONZERO_CPU
331 depends on PPC_POWERNV || PPC_PSERIES
333 config PPC_DCR_NATIVE
341 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
344 config PPC_OF_PLATFORM_PCI
347 depends on PPC64 # not supported on 32 bits yet
349 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
350 depends on PPC32 || PPC_BOOK3S_64
353 config ARCH_SUPPORTS_UPROBES
356 config PPC_ADV_DEBUG_REGS
358 depends on 40x || BOOKE
361 config PPC_ADV_DEBUG_IACS
363 depends on PPC_ADV_DEBUG_REGS
367 config PPC_ADV_DEBUG_DACS
369 depends on PPC_ADV_DEBUG_REGS
372 config PPC_ADV_DEBUG_DVCS
374 depends on PPC_ADV_DEBUG_REGS
378 config PPC_ADV_DEBUG_DAC_RANGE
380 depends on PPC_ADV_DEBUG_REGS && 44x
388 default y if PPC_BOOK3E_64
390 config PGTABLE_LEVELS
395 source "arch/powerpc/sysdev/Kconfig"
396 source "arch/powerpc/platforms/Kconfig"
398 menu "Kernel options"
401 bool "High memory support"
404 source "kernel/Kconfig.hz"
406 config HUGETLB_PAGE_SIZE_VARIABLE
408 depends on HUGETLB_PAGE && PPC_BOOK3S_64
411 config MATH_EMULATION
412 bool "Math emulation"
413 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
415 Some PowerPC chips designed for embedded applications do not have
416 a floating-point unit and therefore do not implement the
417 floating-point instructions in the PowerPC instruction set. If you
418 say Y here, the kernel will include code to emulate a floating-point
419 unit, which will allow programs that use floating-point
422 This is also useful to emulate missing (optional) instructions
423 such as fsqrt on cores that do have an FPU but do not implement
424 them (such as Freescale BookE).
427 prompt "Math emulation options"
428 default MATH_EMULATION_FULL
429 depends on MATH_EMULATION
431 config MATH_EMULATION_FULL
432 bool "Emulate all the floating point instructions"
434 Select this option will enable the kernel to support to emulate
435 all the floating point instructions. If your SoC doesn't have
436 a FPU, you should select this.
438 config MATH_EMULATION_HW_UNIMPLEMENTED
439 bool "Just emulate the FPU unimplemented instructions"
441 Select this if you know there does have a hardware FPU on your
442 SoC, but some floating point instructions are not implemented by that.
446 config PPC_TRANSACTIONAL_MEM
447 bool "Transactional Memory support for POWERPC"
448 depends on PPC_BOOK3S_64
453 Support user-mode Transactional Memory on POWERPC.
456 bool "Ultravisor support"
457 depends on KVM_BOOK3S_HV_POSSIBLE
459 select DEV_PAGEMAP_OPS
460 select DEVICE_PRIVATE
461 select MEMORY_HOTPLUG
462 select MEMORY_HOTREMOVE
465 This option paravirtualizes the kernel to run in POWER platforms that
466 supports the Protected Execution Facility (PEF). On such platforms,
467 the ultravisor firmware runs at a privilege level above the
472 config LD_HEAD_STUB_CATCH
473 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
476 Very large kernels can cause linker branch stubs to be generated by
477 code in head_64.S, which moves the head text sections out of their
478 specified location. This option can work around the problem.
482 config MPROFILE_KERNEL
483 depends on PPC64 && CPU_LITTLE_ENDIAN
484 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
487 bool "Support for enabling/disabling CPUs"
488 depends on SMP && (PPC_PSERIES || \
489 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
491 Say Y here to be able to disable and re-enable individual
492 CPUs at runtime on SMP machines.
494 Say N if you are unsure.
496 config ARCH_CPU_PROBE_RELEASE
498 depends on HOTPLUG_CPU
500 config ARCH_ENABLE_MEMORY_HOTPLUG
503 config ARCH_ENABLE_MEMORY_HOTREMOVE
506 config PPC64_SUPPORTS_MEMORY_FAILURE
507 bool "Add support for memory hwpoison"
508 depends on PPC_BOOK3S_64
509 default "y" if PPC_POWERNV
510 select ARCH_SUPPORTS_MEMORY_FAILURE
513 bool "kexec system call"
514 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
517 kexec is a system call that implements the ability to shutdown your
518 current kernel, and to start another kernel. It is like a reboot
519 but it is independent of the system firmware. And like a reboot
520 you can start any kernel with it, not just Linux.
522 The name comes from the similarity to the exec system call.
524 It is an ongoing process to be certain the hardware in a machine
525 is properly shutdown, so do not be surprised if this code does not
526 initially work for you. As of this writing the exact hardware
527 interface is strongly in flux, so no good recommendation can be
531 bool "kexec file based system call"
533 select HAVE_IMA_KEXEC
538 depends on CRYPTO_SHA256=y
540 This is a new version of the kexec system call. This call is
541 file based and takes in file descriptors as system call arguments
542 for kernel and initramfs as opposed to a list of segments as is the
543 case for the older kexec call.
545 config ARCH_HAS_KEXEC_PURGATORY
549 bool "Build a relocatable kernel"
550 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
551 select NONSTATIC_KERNEL
552 select MODULE_REL_CRCS if MODVERSIONS
554 This builds a kernel image that is capable of running at the
555 location the kernel is loaded at. For ppc32, there is no any
556 alignment restrictions, and this feature is a superset of
557 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
558 16k-aligned base address. The kernel is linked as a
559 position-independent executable (PIE) and contains dynamic relocations
560 which are processed early in the bootup process.
562 One use is for the kexec on panic case where the recovery kernel
563 must live at a different physical address than the primary
566 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
567 it has been loaded at and the compile time physical addresses
568 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
569 setting can still be useful to bootwrappers that need to know the
570 load address of the kernel (eg. u-boot/mkimage).
572 config RANDOMIZE_BASE
573 bool "Randomize the address of the kernel image"
574 depends on (FSL_BOOKE && FLATMEM && PPC32)
575 depends on RELOCATABLE
577 Randomizes the virtual address at which the kernel image is
578 loaded, as a security feature that deters exploit attempts
579 relying on knowledge of the location of kernel internals.
583 config RELOCATABLE_TEST
584 bool "Test relocatable kernel"
585 depends on (PPC64 && RELOCATABLE)
587 This runs the relocatable kernel at the address it was initially
588 loaded at, which tends to be non-zero and therefore test the
592 bool "Build a dump capture kernel"
593 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
594 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
596 Build a kernel suitable for use as a dump capture kernel.
597 The same kernel binary can be used as production kernel and dump
601 bool "Firmware-assisted dump"
602 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
606 A robust mechanism to get reliable kernel crash dump with
607 assistance from firmware. This approach does not use kexec,
608 instead firmware assists in booting the capture kernel
609 while preserving memory contents. Firmware-assisted dump
610 is meant to be a kdump replacement offering robustness and
611 speed not possible without system firmware assistance.
613 If unsure, say "y". Only special kernels like petitboot may
614 need to say "N" here.
616 config PRESERVE_FA_DUMP
617 bool "Preserve Firmware-assisted dump"
618 depends on PPC64 && PPC_POWERNV && !FA_DUMP
620 On a kernel with FA_DUMP disabled, this option helps to preserve
621 crash data from a previously crash'ed kernel. Useful when the next
622 memory preserving kernel boot would process this crash data.
623 Petitboot kernel is the typical usecase for this option.
626 bool "Export OPAL memory as /sys/firmware/opal/core"
627 depends on PPC64 && PPC_POWERNV
629 This option uses the MPIPL support in firmware to provide an
630 ELF core of OPAL memory after a crash. The ELF core is exported
631 as /sys/firmware/opal/core file which is helpful in debugging
632 OPAL crashes using GDB.
635 bool "Distribute interrupts on all CPUs by default"
638 This option gives the kernel permission to distribute IRQs across
639 multiple CPUs. Saying N here will route all IRQs to the first
640 CPU. Generally saying Y is safe, although some problems have been
641 reported with SMP Power Macintoshes with this option enabled.
646 default y if SMP && PPC_PSERIES
652 depends on NEED_MULTIPLE_NODES
654 config USE_PERCPU_NUMA_NODE_ID
658 config HAVE_MEMORYLESS_NODES
662 config ARCH_SELECT_MEMORY_MODEL
666 config ARCH_FLATMEM_ENABLE
668 depends on (PPC64 && !NUMA) || PPC32
670 config ARCH_SPARSEMEM_ENABLE
673 select SPARSEMEM_VMEMMAP_ENABLE
675 config ARCH_SPARSEMEM_DEFAULT
677 depends on PPC_BOOK3S_64
679 config SYS_SUPPORTS_HUGETLBFS
682 config ILLEGAL_POINTER_VALUE
684 # This is roughly half way between the top of user space and the bottom
685 # of kernel space, which seems about as good as we can get.
686 default 0x5deadbeef0000000 if PPC64
689 config ARCH_MEMORY_PROBE
691 depends on MEMORY_HOTPLUG
693 # Some NUMA nodes have memory ranges that span
694 # other nodes. Even though a pfn is valid and
695 # between a node's start and end pfns, it may not
696 # reside on that node. See memmap_init_zone()
698 config NODES_SPAN_OTHER_NODES
700 depends on NEED_MULTIPLE_NODES
703 bool "Using standard binutils settings"
707 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
708 Note, that kernel will be able to run only those applications,
709 which had been compiled using binutils later than 2.17.50.0.3 with
710 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
711 the older binutils, you can patch them with a trivial patch, which
712 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
718 Select the kernel logical page size. Increasing the page size
719 will reduce software overhead at each page boundary, allow
720 hardware prefetch mechanisms to be more effective, and allow
721 larger dma transfers increasing IO efficiency and reducing
722 overhead. However the utilization of memory will increase.
723 For example, each cached file will using a multiple of the
724 page size to hold its contents and the difference between the
725 end of file and the end of page is wasted.
727 Some dedicated systems, such as software raid serving with
728 accelerated calculations, have shown significant increases.
730 If you configure a 64 bit kernel for 64k pages but the
731 processor does not support them, then the kernel will simulate
732 them with 4k pages, loading them on demand, but with the
733 reduced software overhead and larger internal fragmentation.
734 For the 32 bit kernel, a large page option will not be offered
735 unless it is supported by the configured processor.
737 If unsure, choose 4K_PAGES.
741 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
745 depends on 44x || PPC_8xx
749 depends on 44x || PPC_BOOK3S_64
750 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
752 config PPC_256K_PAGES
753 bool "256k page size"
754 depends on 44x && !STDBINUTILS
756 Make the page size 256k.
758 As the ELF standard only requires alignment to support page
759 sizes up to 64k, you will need to compile all of your user
760 space applications with a non-standard binutils settings
761 (see the STDBINUTILS description for details).
763 Say N unless you know what you are doing.
767 config PPC_PAGE_SHIFT
769 default 18 if PPC_256K_PAGES
770 default 16 if PPC_64K_PAGES
771 default 14 if PPC_16K_PAGES
775 int "Thread shift" if EXPERT
777 default "15" if PPC_256K_PAGES
778 default "14" if PPC64
781 Used to define the stack size. The default is almost always what you
782 want. Only change this if you know what you are doing.
784 config ETEXT_SHIFT_BOOL
785 bool "Set custom etext alignment" if STRICT_KERNEL_RWX && \
786 (PPC_BOOK3S_32 || PPC_8xx)
787 depends on ADVANCED_OPTIONS
789 This option allows you to set the kernel end of text alignment. When
790 RAM is mapped by blocks, the alignment needs to fit the size and
791 number of possible blocks. The default should be OK for most configs.
793 Say N here unless you know what you are doing.
796 int "_etext shift" if ETEXT_SHIFT_BOOL
797 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
798 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
799 default 17 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
800 default 19 if STRICT_KERNEL_RWX && PPC_8xx
801 default PPC_PAGE_SHIFT
803 On Book3S 32 (603+), IBATs are used to map kernel text.
804 Smaller is the alignment, greater is the number of necessary IBATs.
806 On 8xx, large pages (512kb or 8M) are used to map kernel linear
807 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
810 config DATA_SHIFT_BOOL
811 bool "Set custom data alignment" if STRICT_KERNEL_RWX && \
812 (PPC_BOOK3S_32 || PPC_8xx)
813 depends on ADVANCED_OPTIONS
815 This option allows you to set the kernel data alignment. When
816 RAM is mapped by blocks, the alignment needs to fit the size and
817 number of possible blocks. The default should be OK for most configs.
819 Say N here unless you know what you are doing.
822 int "Data shift" if DATA_SHIFT_BOOL
823 default 24 if STRICT_KERNEL_RWX && PPC64
824 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
825 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
826 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
827 default 23 if STRICT_KERNEL_RWX && PPC_8xx
828 default PPC_PAGE_SHIFT
830 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
831 Smaller is the alignment, greater is the number of necessary DBATs.
833 On 8xx, large pages (512kb or 8M) are used to map kernel linear
834 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
837 config FORCE_MAX_ZONEORDER
838 int "Maximum zone order"
839 range 8 9 if PPC64 && PPC_64K_PAGES
840 default "9" if PPC64 && PPC_64K_PAGES
841 range 13 13 if PPC64 && !PPC_64K_PAGES
842 default "13" if PPC64 && !PPC_64K_PAGES
843 range 9 64 if PPC32 && PPC_16K_PAGES
844 default "9" if PPC32 && PPC_16K_PAGES
845 range 7 64 if PPC32 && PPC_64K_PAGES
846 default "7" if PPC32 && PPC_64K_PAGES
847 range 5 64 if PPC32 && PPC_256K_PAGES
848 default "5" if PPC32 && PPC_256K_PAGES
852 The kernel memory allocator divides physically contiguous memory
853 blocks into "zones", where each zone is a power of two number of
854 pages. This option selects the largest power of two that the kernel
855 keeps in the memory allocator. If you need to allocate very large
856 blocks of physically contiguous memory, then you may need to
859 This config option is actually maximum order plus one. For example,
860 a value of 11 means that the largest free memory block is 2^10 pages.
862 The page size is not necessarily 4KB. For example, on 64-bit
863 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
864 this in mind when choosing a value for this option.
866 config PPC_SUBPAGE_PROT
867 bool "Support setting protections for 4k subpages"
868 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
870 This option adds support for a system call to allow user programs
871 to set access permissions (read/write, readonly, or no access)
872 on the 4k subpages of each 64k page.
874 config PPC_COPRO_BASE
878 bool "SMT (Hyperthreading) scheduler support"
879 depends on PPC64 && SMP
881 SMT scheduler support improves the CPU scheduler's decision making
882 when dealing with POWER5 cpus at a cost of slightly increased
883 overhead in some places. If unsure say N here.
885 config PPC_DENORMALISATION
886 bool "PowerPC denormalisation exception handling"
887 depends on PPC_BOOK3S_64
888 default "y" if PPC_POWERNV
890 Add support for handling denormalisation of single precision
891 values. Useful for bare metal only. If unsure say Y here.
894 bool "Default bootloader kernel arguments"
897 string "Initial kernel command string" if CMDLINE_BOOL
898 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" if CMDLINE_BOOL
901 On some platforms, there is currently no way for the boot loader to
902 pass arguments to the kernel. For these platforms, you can supply
903 some command-line options at build time by entering them here. In
904 most cases you will need to specify the root device here.
907 prompt "Kernel command line type" if CMDLINE != ""
908 default CMDLINE_FROM_BOOTLOADER
910 config CMDLINE_FROM_BOOTLOADER
911 bool "Use bootloader kernel arguments if available"
913 Uses the command-line options passed by the boot loader. If
914 the boot loader doesn't provide any, the default kernel command
915 string provided in CMDLINE will be used.
917 config CMDLINE_EXTEND
918 bool "Extend bootloader kernel arguments"
920 The command-line arguments provided by the boot loader will be
921 appended to the default kernel command string.
924 bool "Always use the default kernel command string"
926 Always use the default kernel command string, even if the boot
927 loader passes other arguments to the kernel.
928 This is useful if you cannot or don't want to change the
929 command-line options your boot loader passes to the kernel.
934 string "Additional default image types"
936 List additional targets to be built by the bootwrapper here (separated
937 by spaces). This is useful for targets that depend of device tree
938 files in the .dts directory.
940 Targets in this list will be build as part of the default build
941 target, or when the user does a 'make zImage' or a
942 'make zImage.initrd'.
944 If unsure, leave blank
946 config ARCH_WANTS_FREEZER_CONTROL
950 source "kernel/power/Kconfig"
953 bool "Enable seccomp to safely compute untrusted bytecode"
957 This kernel feature is useful for number crunching applications
958 that may need to compute untrusted bytecode during their
959 execution. By using pipes or other transports made available to
960 the process as file descriptors supporting the read/write
961 syscalls, it's possible to isolate those applications in
962 their own address space using seccomp. Once seccomp is
963 enabled via /proc/<pid>/seccomp, it cannot be disabled
964 and the task is only allowed to execute a few safe syscalls
965 defined by each seccomp mode.
967 If unsure, say Y. Only embedded should say N here.
970 prompt "PowerPC Memory Protection Keys"
972 depends on PPC_BOOK3S_64
973 select ARCH_USES_HIGH_VMA_FLAGS
974 select ARCH_HAS_PKEYS
976 Memory Protection Keys provides a mechanism for enforcing
977 page-based protections, but without requiring modification of the
978 page tables when an application changes protection domains.
980 For details, see Documentation/core-api/protection-keys.rst
984 config PPC_SECURE_BOOT
985 prompt "Enable secure boot support"
987 depends on PPC_POWERNV
988 depends on IMA_ARCH_POLICY
990 Systems with firmware secure boot enabled need to define security
991 policies to extend secure boot to the OS. This config allows a user
992 to enable OS secure boot on systems that have firmware support for
993 it. If in doubt say N.
995 config PPC_SECVAR_SYSFS
996 bool "Enable sysfs interface for POWER secure variables"
998 depends on PPC_SECURE_BOOT
1001 POWER secure variables are managed and controlled by firmware.
1002 These variables are exposed to userspace via sysfs to enable
1003 read/write operations on these variables. Say Y if you have
1004 secure boot enabled and want to expose variables to userspace.
1015 bool "Support for ISA-bus hardware"
1019 Find out whether you have ISA slots on your motherboard. ISA is the
1020 name of a bus system, i.e. the way the CPU talks to the other stuff
1021 inside your box. If you have an Apple machine, say N here; if you
1022 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1023 embedded board, consult your board documentation.
1025 config GENERIC_ISA_DMA
1027 depends on ISA_DMA_API
1030 config PPC_INDIRECT_PCI
1033 default y if 40x || 44x
1043 select ARCH_HAS_DMA_SET_MASK
1044 select PPC_INDIRECT_PCI
1050 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1052 Freescale MPC85xx/MPC86xx power management controller support
1053 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1058 depends on SUSPEND && (44x || 40x)
1060 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1061 It also enables support for two different idle states (idle-wait
1068 bool "Freescale Local Bus support"
1070 Enables reporting of errors from the Freescale local bus
1071 controller. Also contains some common code used by
1072 drivers for specific local bus peripherals.
1076 depends on PPC_83xx || QUICC_ENGINE || CPM2
1078 Freescale General-purpose Timers support
1082 depends on PCI && 8260
1083 select PPC_INDIRECT_PCI
1087 bool "Freescale Embedded SRIO Controller support"
1088 depends on RAPIDIO = y && HAVE_RAPIDIO
1091 Include support for RapidIO controller on Freescale embedded
1092 processors (MPC8548, MPC8641, etc).
1096 config NONSTATIC_KERNEL
1099 menu "Advanced setup"
1102 config ADVANCED_OPTIONS
1103 bool "Prompt for advanced kernel configuration options"
1105 This option will enable prompting for a variety of advanced kernel
1106 configuration options. These options can cause the kernel to not
1107 work if they are set incorrectly, but can be used to optimize certain
1108 aspects of kernel memory management.
1110 Unless you know what you are doing, say N here.
1112 comment "Default settings for advanced configuration options are used"
1113 depends on !ADVANCED_OPTIONS
1115 config LOWMEM_SIZE_BOOL
1116 bool "Set maximum low memory"
1117 depends on ADVANCED_OPTIONS
1119 This option allows you to set the maximum amount of memory which
1120 will be used as "low memory", that is, memory which the kernel can
1121 access directly, without having to set up a kernel virtual mapping.
1122 This can be useful in optimizing the layout of kernel virtual
1125 Say N here unless you know what you are doing.
1128 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1129 default "0x30000000"
1131 config LOWMEM_CAM_NUM_BOOL
1132 bool "Set number of CAMs to use to map low memory"
1133 depends on ADVANCED_OPTIONS && FSL_BOOKE
1135 This option allows you to set the maximum number of CAM slots that
1136 will be used to map low memory. There are a limited number of slots
1137 available and even more limited number that will fit in the L1 MMU.
1138 However, using more entries will allow mapping more low memory. This
1139 can be useful in optimizing the layout of kernel virtual memory.
1141 Say N here unless you know what you are doing.
1143 config LOWMEM_CAM_NUM
1144 depends on FSL_BOOKE
1145 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1148 config DYNAMIC_MEMSTART
1149 bool "Enable page aligned dynamic load address for kernel"
1150 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1151 select NONSTATIC_KERNEL
1153 This option enables the kernel to be loaded at any page aligned
1154 physical address. The kernel creates a mapping from KERNELBASE to
1155 the address where the kernel is loaded. The page size here implies
1156 the TLB page size of the mapping for kernel on the particular platform.
1157 Please refer to the init code for finding the TLB page size.
1159 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1160 kernel image, where the only restriction is the page aligned kernel
1161 load address. When this option is enabled, the compile time physical
1162 address CONFIG_PHYSICAL_START is ignored.
1164 This option is overridden by CONFIG_RELOCATABLE
1166 config PAGE_OFFSET_BOOL
1167 bool "Set custom page offset address"
1168 depends on ADVANCED_OPTIONS
1170 This option allows you to set the kernel virtual address at which
1171 the kernel will map low memory. This can be useful in optimizing
1172 the virtual memory layout of the system.
1174 Say N here unless you know what you are doing.
1177 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1178 default "0xc0000000"
1180 config KERNEL_START_BOOL
1181 bool "Set custom kernel base address"
1182 depends on ADVANCED_OPTIONS
1184 This option allows you to set the kernel virtual address at which
1185 the kernel will be loaded. Normally this should match PAGE_OFFSET
1186 however there are times (like kdump) that one might not want them
1189 Say N here unless you know what you are doing.
1192 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1193 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1194 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1195 default "0xc0000000"
1197 config PHYSICAL_START_BOOL
1198 bool "Set physical address where the kernel is loaded"
1199 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1201 This gives the physical address where the kernel is loaded.
1203 Say N here unless you know what you are doing.
1205 config PHYSICAL_START
1206 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1207 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1208 default "0x00000000"
1210 config PHYSICAL_ALIGN
1212 default "0x04000000" if FSL_BOOKE
1214 This value puts the alignment restrictions on physical address
1215 where kernel is loaded and run from. Kernel is compiled for an
1216 address which meets above alignment restriction.
1218 config TASK_SIZE_BOOL
1219 bool "Set custom user task size"
1220 depends on ADVANCED_OPTIONS
1222 This option allows you to set the amount of virtual address space
1223 allocated to user tasks. This can be useful in optimizing the
1224 virtual memory layout of the system.
1226 Say N here unless you know what you are doing.
1229 hex "Size of user task space" if TASK_SIZE_BOOL
1230 default "0x80000000" if PPC_8xx
1231 default "0xc0000000"
1234 bool "Pinned Kernel TLBs (860 ONLY)"
1235 depends on ADVANCED_OPTIONS && PPC_8xx && \
1236 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1239 bool "Pinned TLB for DATA"
1244 bool "Pinned TLB for IMMR"
1245 depends on PIN_TLB || PPC_EARLY_DEBUG_CPM
1249 bool "Pinned TLB for TEXT"
1255 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1258 default "0xc000000000000000"
1261 default "0xc000000000000000"
1262 config PHYSICAL_START
1264 default "0x00000000"
1270 config PPC_LIB_RHEAP
1273 source "arch/powerpc/kvm/Kconfig"
1275 source "kernel/livepatch/Kconfig"