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_DEVMEM_IS_ALLOWED
120 select ARCH_HAS_ELF_RANDOMIZE
121 select ARCH_HAS_FORTIFY_SOURCE
122 select ARCH_HAS_GCOV_PROFILE_ALL
124 select ARCH_HAS_HUGEPD if HUGETLB_PAGE
125 select ARCH_HAS_MEMREMAP_COMPAT_ALIGN
126 select ARCH_HAS_MMIOWB if PPC64
127 select ARCH_HAS_PHYS_TO_DMA
128 select ARCH_HAS_PMEM_API
129 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
130 select ARCH_HAS_PTE_SPECIAL
131 select ARCH_HAS_MEMBARRIER_CALLBACKS
132 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
133 select ARCH_HAS_STRICT_KERNEL_RWX if (PPC32 && !HIBERNATION)
134 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
135 select ARCH_HAS_UACCESS_FLUSHCACHE
136 select ARCH_HAS_UACCESS_MCSAFE if PPC64
137 select ARCH_HAS_UBSAN_SANITIZE_ALL
138 select ARCH_HAVE_NMI_SAFE_CMPXCHG
139 select ARCH_KEEP_MEMBLOCK
140 select ARCH_MIGHT_HAVE_PC_PARPORT
141 select ARCH_MIGHT_HAVE_PC_SERIO
142 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
143 select ARCH_SUPPORTS_ATOMIC_RMW
144 select ARCH_USE_BUILTIN_BSWAP
145 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
146 select ARCH_WANT_IPC_PARSE_VERSION
147 select ARCH_WEAK_RELEASE_ACQUIRE
149 select BUILDTIME_TABLE_SORT
150 select CLONE_BACKWARDS
151 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
152 select DYNAMIC_FTRACE if FUNCTION_TRACER
153 select EDAC_ATOMIC_SCRUB
155 select GENERIC_ATOMIC64 if PPC32
156 select GENERIC_CLOCKEVENTS
157 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
158 select GENERIC_CMOS_UPDATE
159 select GENERIC_CPU_AUTOPROBE
160 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
161 select GENERIC_EARLY_IOREMAP
162 select GENERIC_IRQ_SHOW
163 select GENERIC_IRQ_SHOW_LEVEL
164 select GENERIC_PCI_IOMAP if PCI
165 select GENERIC_SMP_IDLE_THREAD
166 select GENERIC_STRNCPY_FROM_USER
167 select GENERIC_STRNLEN_USER
168 select GENERIC_TIME_VSYSCALL
169 select HAVE_ARCH_AUDITSYSCALL
170 select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
171 select HAVE_ARCH_JUMP_LABEL
172 select HAVE_ARCH_KASAN if PPC32
173 select HAVE_ARCH_KASAN_VMALLOC if PPC32
174 select HAVE_ARCH_KGDB
175 select HAVE_ARCH_MMAP_RND_BITS
176 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
177 select HAVE_ARCH_NVRAM_OPS
178 select HAVE_ARCH_SECCOMP_FILTER
179 select HAVE_ARCH_TRACEHOOK
180 select HAVE_ASM_MODVERSIONS
181 select HAVE_C_RECORDMCOUNT
182 select HAVE_CBPF_JIT if !PPC64
183 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
184 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
185 select HAVE_CONTEXT_TRACKING if PPC64
186 select HAVE_TIF_NOHZ if PPC64
187 select HAVE_COPY_THREAD_TLS
188 select HAVE_DEBUG_KMEMLEAK
189 select HAVE_DEBUG_STACKOVERFLOW
190 select HAVE_DYNAMIC_FTRACE
191 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
192 select HAVE_EBPF_JIT if PPC64
193 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
195 select HAVE_FTRACE_MCOUNT_RECORD
196 select HAVE_FUNCTION_ERROR_INJECTION
197 select HAVE_FUNCTION_GRAPH_TRACER
198 select HAVE_FUNCTION_TRACER
199 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
200 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
202 select HAVE_IOREMAP_PROT
203 select HAVE_IRQ_EXIT_ON_IRQ_STACK
204 select HAVE_KERNEL_GZIP
205 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
206 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
207 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
209 select HAVE_KPROBES_ON_FTRACE
210 select HAVE_KRETPROBES
211 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
212 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
213 select HAVE_MEMBLOCK_NODE_MAP
214 select HAVE_MOD_ARCH_SPECIFIC
215 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
216 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
218 select HAVE_OPTPROBES if PPC64
219 select HAVE_PERF_EVENTS
220 select HAVE_PERF_EVENTS_NMI if PPC64
221 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
222 select HAVE_PERF_REGS
223 select HAVE_PERF_USER_STACK_DUMP
224 select MMU_GATHER_RCU_TABLE_FREE
225 select MMU_GATHER_PAGE_SIZE
226 select HAVE_REGS_AND_STACK_ACCESS_API
227 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
228 select HAVE_SYSCALL_TRACEPOINTS
229 select HAVE_VIRT_CPU_ACCOUNTING
230 select HAVE_IRQ_TIME_ACCOUNTING
232 select IOMMU_HELPER if PPC64
234 select IRQ_FORCED_THREADING
235 select MODULES_USE_ELF_RELA
236 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
237 select NEED_SG_DMA_LENGTH
239 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
240 select OF_EARLY_FLATTREE
241 select OLD_SIGACTION if PPC32
242 select OLD_SIGSUSPEND
243 select PCI_DOMAINS if PCI
244 select PCI_SYSCALL if PCI
245 select PPC_DAWR if PPC64
248 select SYSCTL_EXCEPTION_TRACE
249 select THREAD_INFO_IN_TASK
250 select VIRT_TO_BUS if !PPC64
252 # Please keep this list sorted alphabetically.
255 config PPC_BARRIER_NOSPEC
258 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
269 bool "Enable support for 32bit binaries"
271 default y if !CPU_LITTLE_ENDIAN
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
458 depends on DEVICE_PRIVATE
461 This option paravirtualizes the kernel to run in POWER platforms that
462 supports the Protected Execution Facility (PEF). On such platforms,
463 the ultravisor firmware runs at a privilege level above the
468 config LD_HEAD_STUB_CATCH
469 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
472 Very large kernels can cause linker branch stubs to be generated by
473 code in head_64.S, which moves the head text sections out of their
474 specified location. This option can work around the problem.
478 config MPROFILE_KERNEL
479 depends on PPC64 && CPU_LITTLE_ENDIAN
480 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
483 bool "Support for enabling/disabling CPUs"
484 depends on SMP && (PPC_PSERIES || \
485 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
487 Say Y here to be able to disable and re-enable individual
488 CPUs at runtime on SMP machines.
490 Say N if you are unsure.
492 config ARCH_CPU_PROBE_RELEASE
494 depends on HOTPLUG_CPU
496 config ARCH_ENABLE_MEMORY_HOTPLUG
499 config ARCH_ENABLE_MEMORY_HOTREMOVE
502 config PPC64_SUPPORTS_MEMORY_FAILURE
503 bool "Add support for memory hwpoison"
504 depends on PPC_BOOK3S_64
505 default "y" if PPC_POWERNV
506 select ARCH_SUPPORTS_MEMORY_FAILURE
509 bool "kexec system call"
510 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
513 kexec is a system call that implements the ability to shutdown your
514 current kernel, and to start another kernel. It is like a reboot
515 but it is independent of the system firmware. And like a reboot
516 you can start any kernel with it, not just Linux.
518 The name comes from the similarity to the exec system call.
520 It is an ongoing process to be certain the hardware in a machine
521 is properly shutdown, so do not be surprised if this code does not
522 initially work for you. As of this writing the exact hardware
523 interface is strongly in flux, so no good recommendation can be
527 bool "kexec file based system call"
529 select HAVE_IMA_KEXEC
534 depends on CRYPTO_SHA256=y
536 This is a new version of the kexec system call. This call is
537 file based and takes in file descriptors as system call arguments
538 for kernel and initramfs as opposed to a list of segments as is the
539 case for the older kexec call.
541 config ARCH_HAS_KEXEC_PURGATORY
545 bool "Build a relocatable kernel"
546 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
547 select NONSTATIC_KERNEL
548 select MODULE_REL_CRCS if MODVERSIONS
550 This builds a kernel image that is capable of running at the
551 location the kernel is loaded at. For ppc32, there is no any
552 alignment restrictions, and this feature is a superset of
553 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
554 16k-aligned base address. The kernel is linked as a
555 position-independent executable (PIE) and contains dynamic relocations
556 which are processed early in the bootup process.
558 One use is for the kexec on panic case where the recovery kernel
559 must live at a different physical address than the primary
562 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
563 it has been loaded at and the compile time physical addresses
564 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
565 setting can still be useful to bootwrappers that need to know the
566 load address of the kernel (eg. u-boot/mkimage).
568 config RANDOMIZE_BASE
569 bool "Randomize the address of the kernel image"
570 depends on (FSL_BOOKE && FLATMEM && PPC32)
571 depends on RELOCATABLE
573 Randomizes the virtual address at which the kernel image is
574 loaded, as a security feature that deters exploit attempts
575 relying on knowledge of the location of kernel internals.
579 config RELOCATABLE_TEST
580 bool "Test relocatable kernel"
581 depends on (PPC64 && RELOCATABLE)
583 This runs the relocatable kernel at the address it was initially
584 loaded at, which tends to be non-zero and therefore test the
588 bool "Build a dump capture kernel"
589 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
590 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
592 Build a kernel suitable for use as a dump capture kernel.
593 The same kernel binary can be used as production kernel and dump
597 bool "Firmware-assisted dump"
598 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
602 A robust mechanism to get reliable kernel crash dump with
603 assistance from firmware. This approach does not use kexec,
604 instead firmware assists in booting the capture kernel
605 while preserving memory contents. Firmware-assisted dump
606 is meant to be a kdump replacement offering robustness and
607 speed not possible without system firmware assistance.
609 If unsure, say "y". Only special kernels like petitboot may
610 need to say "N" here.
612 config PRESERVE_FA_DUMP
613 bool "Preserve Firmware-assisted dump"
614 depends on PPC64 && PPC_POWERNV && !FA_DUMP
616 On a kernel with FA_DUMP disabled, this option helps to preserve
617 crash data from a previously crash'ed kernel. Useful when the next
618 memory preserving kernel boot would process this crash data.
619 Petitboot kernel is the typical usecase for this option.
622 bool "Export OPAL memory as /sys/firmware/opal/core"
623 depends on PPC64 && PPC_POWERNV
625 This option uses the MPIPL support in firmware to provide an
626 ELF core of OPAL memory after a crash. The ELF core is exported
627 as /sys/firmware/opal/core file which is helpful in debugging
628 OPAL crashes using GDB.
631 bool "Distribute interrupts on all CPUs by default"
634 This option gives the kernel permission to distribute IRQs across
635 multiple CPUs. Saying N here will route all IRQs to the first
636 CPU. Generally saying Y is safe, although some problems have been
637 reported with SMP Power Macintoshes with this option enabled.
642 default y if SMP && PPC_PSERIES
648 depends on NEED_MULTIPLE_NODES
650 config USE_PERCPU_NUMA_NODE_ID
654 config HAVE_MEMORYLESS_NODES
658 config ARCH_SELECT_MEMORY_MODEL
662 config ARCH_FLATMEM_ENABLE
664 depends on (PPC64 && !NUMA) || PPC32
666 config ARCH_SPARSEMEM_ENABLE
669 select SPARSEMEM_VMEMMAP_ENABLE
671 config ARCH_SPARSEMEM_DEFAULT
673 depends on PPC_BOOK3S_64
675 config SYS_SUPPORTS_HUGETLBFS
678 config ILLEGAL_POINTER_VALUE
680 # This is roughly half way between the top of user space and the bottom
681 # of kernel space, which seems about as good as we can get.
682 default 0x5deadbeef0000000 if PPC64
685 config ARCH_MEMORY_PROBE
687 depends on MEMORY_HOTPLUG
689 # Some NUMA nodes have memory ranges that span
690 # other nodes. Even though a pfn is valid and
691 # between a node's start and end pfns, it may not
692 # reside on that node. See memmap_init_zone()
694 config NODES_SPAN_OTHER_NODES
696 depends on NEED_MULTIPLE_NODES
699 bool "Using standard binutils settings"
703 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
704 Note, that kernel will be able to run only those applications,
705 which had been compiled using binutils later than 2.17.50.0.3 with
706 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
707 the older binutils, you can patch them with a trivial patch, which
708 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
714 Select the kernel logical page size. Increasing the page size
715 will reduce software overhead at each page boundary, allow
716 hardware prefetch mechanisms to be more effective, and allow
717 larger dma transfers increasing IO efficiency and reducing
718 overhead. However the utilization of memory will increase.
719 For example, each cached file will using a multiple of the
720 page size to hold its contents and the difference between the
721 end of file and the end of page is wasted.
723 Some dedicated systems, such as software raid serving with
724 accelerated calculations, have shown significant increases.
726 If you configure a 64 bit kernel for 64k pages but the
727 processor does not support them, then the kernel will simulate
728 them with 4k pages, loading them on demand, but with the
729 reduced software overhead and larger internal fragmentation.
730 For the 32 bit kernel, a large page option will not be offered
731 unless it is supported by the configured processor.
733 If unsure, choose 4K_PAGES.
737 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
741 depends on 44x || PPC_8xx
745 depends on 44x || PPC_BOOK3S_64
746 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
748 config PPC_256K_PAGES
749 bool "256k page size"
750 depends on 44x && !STDBINUTILS
752 Make the page size 256k.
754 As the ELF standard only requires alignment to support page
755 sizes up to 64k, you will need to compile all of your user
756 space applications with a non-standard binutils settings
757 (see the STDBINUTILS description for details).
759 Say N unless you know what you are doing.
763 config PPC_PAGE_SHIFT
765 default 18 if PPC_256K_PAGES
766 default 16 if PPC_64K_PAGES
767 default 14 if PPC_16K_PAGES
771 int "Thread shift" if EXPERT
773 default "15" if PPC_256K_PAGES
774 default "14" if PPC64
777 Used to define the stack size. The default is almost always what you
778 want. Only change this if you know what you are doing.
780 config ETEXT_SHIFT_BOOL
781 bool "Set custom etext alignment" if STRICT_KERNEL_RWX && \
782 (PPC_BOOK3S_32 || PPC_8xx)
783 depends on ADVANCED_OPTIONS
785 This option allows you to set the kernel end of text alignment. When
786 RAM is mapped by blocks, the alignment needs to fit the size and
787 number of possible blocks. The default should be OK for most configs.
789 Say N here unless you know what you are doing.
792 int "_etext shift" if ETEXT_SHIFT_BOOL
793 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
794 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
795 default 17 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
796 default 19 if STRICT_KERNEL_RWX && PPC_8xx
797 default PPC_PAGE_SHIFT
799 On Book3S 32 (603+), IBATs are used to map kernel text.
800 Smaller is the alignment, greater is the number of necessary IBATs.
802 On 8xx, large pages (512kb or 8M) are used to map kernel linear
803 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
806 config DATA_SHIFT_BOOL
807 bool "Set custom data alignment" if STRICT_KERNEL_RWX && \
808 (PPC_BOOK3S_32 || PPC_8xx)
809 depends on ADVANCED_OPTIONS
811 This option allows you to set the kernel data alignment. When
812 RAM is mapped by blocks, the alignment needs to fit the size and
813 number of possible blocks. The default should be OK for most configs.
815 Say N here unless you know what you are doing.
818 int "Data shift" if DATA_SHIFT_BOOL
819 default 24 if STRICT_KERNEL_RWX && PPC64
820 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
821 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
822 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
823 default 23 if STRICT_KERNEL_RWX && PPC_8xx
824 default PPC_PAGE_SHIFT
826 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
827 Smaller is the alignment, greater is the number of necessary DBATs.
829 On 8xx, large pages (512kb or 8M) are used to map kernel linear
830 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
833 config FORCE_MAX_ZONEORDER
834 int "Maximum zone order"
835 range 8 9 if PPC64 && PPC_64K_PAGES
836 default "9" if PPC64 && PPC_64K_PAGES
837 range 13 13 if PPC64 && !PPC_64K_PAGES
838 default "13" if PPC64 && !PPC_64K_PAGES
839 range 9 64 if PPC32 && PPC_16K_PAGES
840 default "9" if PPC32 && PPC_16K_PAGES
841 range 7 64 if PPC32 && PPC_64K_PAGES
842 default "7" if PPC32 && PPC_64K_PAGES
843 range 5 64 if PPC32 && PPC_256K_PAGES
844 default "5" if PPC32 && PPC_256K_PAGES
848 The kernel memory allocator divides physically contiguous memory
849 blocks into "zones", where each zone is a power of two number of
850 pages. This option selects the largest power of two that the kernel
851 keeps in the memory allocator. If you need to allocate very large
852 blocks of physically contiguous memory, then you may need to
855 This config option is actually maximum order plus one. For example,
856 a value of 11 means that the largest free memory block is 2^10 pages.
858 The page size is not necessarily 4KB. For example, on 64-bit
859 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
860 this in mind when choosing a value for this option.
862 config PPC_SUBPAGE_PROT
863 bool "Support setting protections for 4k subpages"
864 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
866 This option adds support for a system call to allow user programs
867 to set access permissions (read/write, readonly, or no access)
868 on the 4k subpages of each 64k page.
870 config PPC_COPRO_BASE
874 bool "SMT (Hyperthreading) scheduler support"
875 depends on PPC64 && SMP
877 SMT scheduler support improves the CPU scheduler's decision making
878 when dealing with POWER5 cpus at a cost of slightly increased
879 overhead in some places. If unsure say N here.
881 config PPC_DENORMALISATION
882 bool "PowerPC denormalisation exception handling"
883 depends on PPC_BOOK3S_64
884 default "y" if PPC_POWERNV
886 Add support for handling denormalisation of single precision
887 values. Useful for bare metal only. If unsure say Y here.
890 bool "Default bootloader kernel arguments"
893 string "Initial kernel command string" if CMDLINE_BOOL
894 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" if CMDLINE_BOOL
897 On some platforms, there is currently no way for the boot loader to
898 pass arguments to the kernel. For these platforms, you can supply
899 some command-line options at build time by entering them here. In
900 most cases you will need to specify the root device here.
903 prompt "Kernel command line type" if CMDLINE != ""
904 default CMDLINE_FROM_BOOTLOADER
906 config CMDLINE_FROM_BOOTLOADER
907 bool "Use bootloader kernel arguments if available"
909 Uses the command-line options passed by the boot loader. If
910 the boot loader doesn't provide any, the default kernel command
911 string provided in CMDLINE will be used.
913 config CMDLINE_EXTEND
914 bool "Extend bootloader kernel arguments"
916 The command-line arguments provided by the boot loader will be
917 appended to the default kernel command string.
920 bool "Always use the default kernel command string"
922 Always use the default kernel command string, even if the boot
923 loader passes other arguments to the kernel.
924 This is useful if you cannot or don't want to change the
925 command-line options your boot loader passes to the kernel.
930 string "Additional default image types"
932 List additional targets to be built by the bootwrapper here (separated
933 by spaces). This is useful for targets that depend of device tree
934 files in the .dts directory.
936 Targets in this list will be build as part of the default build
937 target, or when the user does a 'make zImage' or a
938 'make zImage.initrd'.
940 If unsure, leave blank
942 config ARCH_WANTS_FREEZER_CONTROL
946 source "kernel/power/Kconfig"
949 bool "Enable seccomp to safely compute untrusted bytecode"
953 This kernel feature is useful for number crunching applications
954 that may need to compute untrusted bytecode during their
955 execution. By using pipes or other transports made available to
956 the process as file descriptors supporting the read/write
957 syscalls, it's possible to isolate those applications in
958 their own address space using seccomp. Once seccomp is
959 enabled via /proc/<pid>/seccomp, it cannot be disabled
960 and the task is only allowed to execute a few safe syscalls
961 defined by each seccomp mode.
963 If unsure, say Y. Only embedded should say N here.
966 prompt "PowerPC Memory Protection Keys"
968 depends on PPC_BOOK3S_64
969 select ARCH_USES_HIGH_VMA_FLAGS
970 select ARCH_HAS_PKEYS
972 Memory Protection Keys provides a mechanism for enforcing
973 page-based protections, but without requiring modification of the
974 page tables when an application changes protection domains.
976 For details, see Documentation/core-api/protection-keys.rst
980 config PPC_SECURE_BOOT
981 prompt "Enable secure boot support"
983 depends on PPC_POWERNV
984 depends on IMA_ARCH_POLICY
985 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
987 Systems with firmware secure boot enabled need to define security
988 policies to extend secure boot to the OS. This config allows a user
989 to enable OS secure boot on systems that have firmware support for
990 it. If in doubt say N.
992 config PPC_SECVAR_SYSFS
993 bool "Enable sysfs interface for POWER secure variables"
995 depends on PPC_SECURE_BOOT
998 POWER secure variables are managed and controlled by firmware.
999 These variables are exposed to userspace via sysfs to enable
1000 read/write operations on these variables. Say Y if you have
1001 secure boot enabled and want to expose variables to userspace.
1012 bool "Support for ISA-bus hardware"
1016 Find out whether you have ISA slots on your motherboard. ISA is the
1017 name of a bus system, i.e. the way the CPU talks to the other stuff
1018 inside your box. If you have an Apple machine, say N here; if you
1019 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1020 embedded board, consult your board documentation.
1022 config GENERIC_ISA_DMA
1024 depends on ISA_DMA_API
1027 config PPC_INDIRECT_PCI
1030 default y if 40x || 44x
1040 select ARCH_HAS_DMA_SET_MASK
1041 select PPC_INDIRECT_PCI
1047 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1049 Freescale MPC85xx/MPC86xx power management controller support
1050 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1055 depends on SUSPEND && (44x || 40x)
1057 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1058 It also enables support for two different idle states (idle-wait
1065 bool "Freescale Local Bus support"
1067 Enables reporting of errors from the Freescale local bus
1068 controller. Also contains some common code used by
1069 drivers for specific local bus peripherals.
1073 depends on PPC_83xx || QUICC_ENGINE || CPM2
1075 Freescale General-purpose Timers support
1079 depends on PCI && 8260
1080 select PPC_INDIRECT_PCI
1084 bool "Freescale Embedded SRIO Controller support"
1085 depends on RAPIDIO = y && HAVE_RAPIDIO
1088 Include support for RapidIO controller on Freescale embedded
1089 processors (MPC8548, MPC8641, etc).
1093 config NONSTATIC_KERNEL
1096 menu "Advanced setup"
1099 config ADVANCED_OPTIONS
1100 bool "Prompt for advanced kernel configuration options"
1102 This option will enable prompting for a variety of advanced kernel
1103 configuration options. These options can cause the kernel to not
1104 work if they are set incorrectly, but can be used to optimize certain
1105 aspects of kernel memory management.
1107 Unless you know what you are doing, say N here.
1109 comment "Default settings for advanced configuration options are used"
1110 depends on !ADVANCED_OPTIONS
1112 config LOWMEM_SIZE_BOOL
1113 bool "Set maximum low memory"
1114 depends on ADVANCED_OPTIONS
1116 This option allows you to set the maximum amount of memory which
1117 will be used as "low memory", that is, memory which the kernel can
1118 access directly, without having to set up a kernel virtual mapping.
1119 This can be useful in optimizing the layout of kernel virtual
1122 Say N here unless you know what you are doing.
1125 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1126 default "0x30000000"
1128 config LOWMEM_CAM_NUM_BOOL
1129 bool "Set number of CAMs to use to map low memory"
1130 depends on ADVANCED_OPTIONS && FSL_BOOKE
1132 This option allows you to set the maximum number of CAM slots that
1133 will be used to map low memory. There are a limited number of slots
1134 available and even more limited number that will fit in the L1 MMU.
1135 However, using more entries will allow mapping more low memory. This
1136 can be useful in optimizing the layout of kernel virtual memory.
1138 Say N here unless you know what you are doing.
1140 config LOWMEM_CAM_NUM
1141 depends on FSL_BOOKE
1142 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1145 config DYNAMIC_MEMSTART
1146 bool "Enable page aligned dynamic load address for kernel"
1147 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1148 select NONSTATIC_KERNEL
1150 This option enables the kernel to be loaded at any page aligned
1151 physical address. The kernel creates a mapping from KERNELBASE to
1152 the address where the kernel is loaded. The page size here implies
1153 the TLB page size of the mapping for kernel on the particular platform.
1154 Please refer to the init code for finding the TLB page size.
1156 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1157 kernel image, where the only restriction is the page aligned kernel
1158 load address. When this option is enabled, the compile time physical
1159 address CONFIG_PHYSICAL_START is ignored.
1161 This option is overridden by CONFIG_RELOCATABLE
1163 config PAGE_OFFSET_BOOL
1164 bool "Set custom page offset address"
1165 depends on ADVANCED_OPTIONS
1167 This option allows you to set the kernel virtual address at which
1168 the kernel will map low memory. This can be useful in optimizing
1169 the virtual memory layout of the system.
1171 Say N here unless you know what you are doing.
1174 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1175 default "0xc0000000"
1177 config KERNEL_START_BOOL
1178 bool "Set custom kernel base address"
1179 depends on ADVANCED_OPTIONS
1181 This option allows you to set the kernel virtual address at which
1182 the kernel will be loaded. Normally this should match PAGE_OFFSET
1183 however there are times (like kdump) that one might not want them
1186 Say N here unless you know what you are doing.
1189 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1190 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1191 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1192 default "0xc0000000"
1194 config PHYSICAL_START_BOOL
1195 bool "Set physical address where the kernel is loaded"
1196 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1198 This gives the physical address where the kernel is loaded.
1200 Say N here unless you know what you are doing.
1202 config PHYSICAL_START
1203 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1204 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1205 default "0x00000000"
1207 config PHYSICAL_ALIGN
1209 default "0x04000000" if FSL_BOOKE
1211 This value puts the alignment restrictions on physical address
1212 where kernel is loaded and run from. Kernel is compiled for an
1213 address which meets above alignment restriction.
1215 config TASK_SIZE_BOOL
1216 bool "Set custom user task size"
1217 depends on ADVANCED_OPTIONS
1219 This option allows you to set the amount of virtual address space
1220 allocated to user tasks. This can be useful in optimizing the
1221 virtual memory layout of the system.
1223 Say N here unless you know what you are doing.
1226 hex "Size of user task space" if TASK_SIZE_BOOL
1227 default "0x80000000" if PPC_8xx
1228 default "0xc0000000"
1231 bool "Pinned Kernel TLBs (860 ONLY)"
1232 depends on ADVANCED_OPTIONS && PPC_8xx && \
1233 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1236 bool "Pinned TLB for DATA"
1241 bool "Pinned TLB for IMMR"
1242 depends on PIN_TLB || PPC_EARLY_DEBUG_CPM
1246 bool "Pinned TLB for TEXT"
1252 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1255 default "0xc000000000000000"
1258 default "0xc000000000000000"
1259 config PHYSICAL_START
1261 default "0x00000000"
1267 config PPC_LIB_RHEAP
1270 source "arch/powerpc/kvm/Kconfig"
1272 source "kernel/livepatch/Kconfig"