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 DYNAMIC_FTRACE if FUNCTION_TRACER
158 select EDAC_ATOMIC_SCRUB
160 select GENERIC_ATOMIC64 if PPC32
161 select GENERIC_CLOCKEVENTS
162 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
163 select GENERIC_CMOS_UPDATE
164 select GENERIC_CPU_AUTOPROBE
165 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
166 select GENERIC_EARLY_IOREMAP
167 select GENERIC_IRQ_SHOW
168 select GENERIC_IRQ_SHOW_LEVEL
169 select GENERIC_PCI_IOMAP if PCI
170 select GENERIC_SMP_IDLE_THREAD
171 select GENERIC_STRNCPY_FROM_USER
172 select GENERIC_STRNLEN_USER
173 select GENERIC_TIME_VSYSCALL
174 select HAVE_ARCH_AUDITSYSCALL
175 select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
176 select HAVE_ARCH_JUMP_LABEL
177 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
178 select HAVE_ARCH_KASAN_VMALLOC if PPC32 && PPC_PAGE_SHIFT <= 14
179 select HAVE_ARCH_KGDB
180 select HAVE_ARCH_MMAP_RND_BITS
181 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
182 select HAVE_ARCH_NVRAM_OPS
183 select HAVE_ARCH_SECCOMP_FILTER
184 select HAVE_ARCH_TRACEHOOK
185 select HAVE_ASM_MODVERSIONS
186 select HAVE_C_RECORDMCOUNT
187 select HAVE_CBPF_JIT if !PPC64
188 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
189 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
190 select HAVE_CONTEXT_TRACKING if PPC64
191 select HAVE_TIF_NOHZ if PPC64
192 select HAVE_COPY_THREAD_TLS
193 select HAVE_DEBUG_KMEMLEAK
194 select HAVE_DEBUG_STACKOVERFLOW
195 select HAVE_DYNAMIC_FTRACE
196 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
197 select HAVE_EBPF_JIT if PPC64
198 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
200 select HAVE_FTRACE_MCOUNT_RECORD
201 select HAVE_FUNCTION_ERROR_INJECTION
202 select HAVE_FUNCTION_GRAPH_TRACER
203 select HAVE_FUNCTION_TRACER
204 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
205 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
207 select HAVE_IOREMAP_PROT
208 select HAVE_IRQ_EXIT_ON_IRQ_STACK
209 select HAVE_KERNEL_GZIP
210 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
211 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
212 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
214 select HAVE_KPROBES_ON_FTRACE
215 select HAVE_KRETPROBES
216 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
217 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
218 select HAVE_MOD_ARCH_SPECIFIC
219 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
220 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
222 select HAVE_OPTPROBES if PPC64
223 select HAVE_PERF_EVENTS
224 select HAVE_PERF_EVENTS_NMI if PPC64
225 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
226 select HAVE_PERF_REGS
227 select HAVE_PERF_USER_STACK_DUMP
228 select MMU_GATHER_RCU_TABLE_FREE
229 select MMU_GATHER_PAGE_SIZE
230 select HAVE_REGS_AND_STACK_ACCESS_API
231 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
232 select HAVE_SYSCALL_TRACEPOINTS
233 select HAVE_VIRT_CPU_ACCOUNTING
234 select HAVE_IRQ_TIME_ACCOUNTING
236 select IOMMU_HELPER if PPC64
238 select IRQ_FORCED_THREADING
239 select MODULES_USE_ELF_RELA
240 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
241 select NEED_SG_DMA_LENGTH
243 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
244 select OF_EARLY_FLATTREE
245 select OLD_SIGACTION if PPC32
246 select OLD_SIGSUSPEND
247 select PCI_DOMAINS if PCI
248 select PCI_SYSCALL if PCI
249 select PPC_DAWR if PPC64
252 select SYSCTL_EXCEPTION_TRACE
253 select THREAD_INFO_IN_TASK
254 select VIRT_TO_BUS if !PPC64
256 # Please keep this list sorted alphabetically.
259 config PPC_BARRIER_NOSPEC
262 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
273 bool "Enable support for 32bit binaries"
275 default y if !CPU_LITTLE_ENDIAN
276 select COMPAT_BINFMT_ELF
277 select ARCH_WANT_OLD_COMPAT_IPC
278 select COMPAT_OLD_SIGACTION
280 config SYSVIPC_COMPAT
282 depends on COMPAT && SYSVIPC
285 config SCHED_OMIT_FRAME_POINTER
289 config ARCH_MAY_HAVE_PC_FDC
293 config PPC_UDBG_16550
296 config GENERIC_TBSYNC
298 default y if PPC32 && SMP
309 config SYS_SUPPORTS_APM_EMULATION
310 default y if PMAC_APM_EMU
316 Used to allow a board to specify it wants an ePAPR compliant wrapper.
318 config DEFAULT_UIMAGE
321 Used to allow a board to specify it wants a uImage built by default
323 config ARCH_HIBERNATION_POSSIBLE
327 config ARCH_SUSPEND_POSSIBLE
329 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
330 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
333 config ARCH_SUSPEND_NONZERO_CPU
335 depends on PPC_POWERNV || PPC_PSERIES
337 config PPC_DCR_NATIVE
345 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
348 config PPC_OF_PLATFORM_PCI
351 depends on PPC64 # not supported on 32 bits yet
353 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
354 depends on PPC32 || PPC_BOOK3S_64
357 config ARCH_SUPPORTS_UPROBES
360 config PPC_ADV_DEBUG_REGS
362 depends on 40x || BOOKE
365 config PPC_ADV_DEBUG_IACS
367 depends on PPC_ADV_DEBUG_REGS
371 config PPC_ADV_DEBUG_DACS
373 depends on PPC_ADV_DEBUG_REGS
376 config PPC_ADV_DEBUG_DVCS
378 depends on PPC_ADV_DEBUG_REGS
382 config PPC_ADV_DEBUG_DAC_RANGE
384 depends on PPC_ADV_DEBUG_REGS && 44x
392 default y if PPC_BOOK3E_64
394 config PGTABLE_LEVELS
399 source "arch/powerpc/sysdev/Kconfig"
400 source "arch/powerpc/platforms/Kconfig"
402 menu "Kernel options"
405 bool "High memory support"
408 source "kernel/Kconfig.hz"
410 config HUGETLB_PAGE_SIZE_VARIABLE
412 depends on HUGETLB_PAGE && PPC_BOOK3S_64
415 config MATH_EMULATION
416 bool "Math emulation"
417 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
419 Some PowerPC chips designed for embedded applications do not have
420 a floating-point unit and therefore do not implement the
421 floating-point instructions in the PowerPC instruction set. If you
422 say Y here, the kernel will include code to emulate a floating-point
423 unit, which will allow programs that use floating-point
426 This is also useful to emulate missing (optional) instructions
427 such as fsqrt on cores that do have an FPU but do not implement
428 them (such as Freescale BookE).
431 prompt "Math emulation options"
432 default MATH_EMULATION_FULL
433 depends on MATH_EMULATION
435 config MATH_EMULATION_FULL
436 bool "Emulate all the floating point instructions"
438 Select this option will enable the kernel to support to emulate
439 all the floating point instructions. If your SoC doesn't have
440 a FPU, you should select this.
442 config MATH_EMULATION_HW_UNIMPLEMENTED
443 bool "Just emulate the FPU unimplemented instructions"
445 Select this if you know there does have a hardware FPU on your
446 SoC, but some floating point instructions are not implemented by that.
450 config PPC_TRANSACTIONAL_MEM
451 bool "Transactional Memory support for POWERPC"
452 depends on PPC_BOOK3S_64
457 Support user-mode Transactional Memory on POWERPC.
460 bool "Ultravisor support"
461 depends on KVM_BOOK3S_HV_POSSIBLE
462 depends on DEVICE_PRIVATE
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 && FUNCTION_TRACER
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 PPC_QUEUED_SPINLOCKS
497 bool "Queued spinlocks"
500 Say Y here to use queued spinlocks which give better scalability and
501 fairness on large SMP and NUMA systems without harming single threaded
504 This option is currently experimental, the code is more complex and
505 less tested so it defaults to "N" for the moment.
509 config ARCH_CPU_PROBE_RELEASE
511 depends on HOTPLUG_CPU
513 config ARCH_ENABLE_MEMORY_HOTPLUG
516 config ARCH_ENABLE_MEMORY_HOTREMOVE
519 config PPC64_SUPPORTS_MEMORY_FAILURE
520 bool "Add support for memory hwpoison"
521 depends on PPC_BOOK3S_64
522 default "y" if PPC_POWERNV
523 select ARCH_SUPPORTS_MEMORY_FAILURE
526 bool "kexec system call"
527 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
530 kexec is a system call that implements the ability to shutdown your
531 current kernel, and to start another kernel. It is like a reboot
532 but it is independent of the system firmware. And like a reboot
533 you can start any kernel with it, not just Linux.
535 The name comes from the similarity to the exec system call.
537 It is an ongoing process to be certain the hardware in a machine
538 is properly shutdown, so do not be surprised if this code does not
539 initially work for you. As of this writing the exact hardware
540 interface is strongly in flux, so no good recommendation can be
544 bool "kexec file based system call"
546 select HAVE_IMA_KEXEC
551 depends on CRYPTO_SHA256=y
553 This is a new version of the kexec system call. This call is
554 file based and takes in file descriptors as system call arguments
555 for kernel and initramfs as opposed to a list of segments as is the
556 case for the older kexec call.
558 config ARCH_HAS_KEXEC_PURGATORY
562 bool "Build a relocatable kernel"
563 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
564 select NONSTATIC_KERNEL
565 select MODULE_REL_CRCS if MODVERSIONS
567 This builds a kernel image that is capable of running at the
568 location the kernel is loaded at. For ppc32, there is no any
569 alignment restrictions, and this feature is a superset of
570 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
571 16k-aligned base address. The kernel is linked as a
572 position-independent executable (PIE) and contains dynamic relocations
573 which are processed early in the bootup process.
575 One use is for the kexec on panic case where the recovery kernel
576 must live at a different physical address than the primary
579 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
580 it has been loaded at and the compile time physical addresses
581 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
582 setting can still be useful to bootwrappers that need to know the
583 load address of the kernel (eg. u-boot/mkimage).
585 config RANDOMIZE_BASE
586 bool "Randomize the address of the kernel image"
587 depends on (FSL_BOOKE && FLATMEM && PPC32)
588 depends on RELOCATABLE
590 Randomizes the virtual address at which the kernel image is
591 loaded, as a security feature that deters exploit attempts
592 relying on knowledge of the location of kernel internals.
596 config RELOCATABLE_TEST
597 bool "Test relocatable kernel"
598 depends on (PPC64 && RELOCATABLE)
600 This runs the relocatable kernel at the address it was initially
601 loaded at, which tends to be non-zero and therefore test the
605 bool "Build a dump capture kernel"
606 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
607 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
609 Build a kernel suitable for use as a dump capture kernel.
610 The same kernel binary can be used as production kernel and dump
614 bool "Firmware-assisted dump"
615 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
619 A robust mechanism to get reliable kernel crash dump with
620 assistance from firmware. This approach does not use kexec,
621 instead firmware assists in booting the capture kernel
622 while preserving memory contents. Firmware-assisted dump
623 is meant to be a kdump replacement offering robustness and
624 speed not possible without system firmware assistance.
626 If unsure, say "y". Only special kernels like petitboot may
627 need to say "N" here.
629 config PRESERVE_FA_DUMP
630 bool "Preserve Firmware-assisted dump"
631 depends on PPC64 && PPC_POWERNV && !FA_DUMP
633 On a kernel with FA_DUMP disabled, this option helps to preserve
634 crash data from a previously crash'ed kernel. Useful when the next
635 memory preserving kernel boot would process this crash data.
636 Petitboot kernel is the typical usecase for this option.
639 bool "Export OPAL memory as /sys/firmware/opal/core"
640 depends on PPC64 && PPC_POWERNV
642 This option uses the MPIPL support in firmware to provide an
643 ELF core of OPAL memory after a crash. The ELF core is exported
644 as /sys/firmware/opal/core file which is helpful in debugging
645 OPAL crashes using GDB.
648 bool "Distribute interrupts on all CPUs by default"
651 This option gives the kernel permission to distribute IRQs across
652 multiple CPUs. Saying N here will route all IRQs to the first
653 CPU. Generally saying Y is safe, although some problems have been
654 reported with SMP Power Macintoshes with this option enabled.
659 default y if SMP && PPC_PSERIES
665 depends on NEED_MULTIPLE_NODES
667 config USE_PERCPU_NUMA_NODE_ID
671 config HAVE_MEMORYLESS_NODES
675 config ARCH_SELECT_MEMORY_MODEL
679 config ARCH_FLATMEM_ENABLE
681 depends on (PPC64 && !NUMA) || PPC32
683 config ARCH_SPARSEMEM_ENABLE
686 select SPARSEMEM_VMEMMAP_ENABLE
688 config ARCH_SPARSEMEM_DEFAULT
690 depends on PPC_BOOK3S_64
692 config SYS_SUPPORTS_HUGETLBFS
695 config ILLEGAL_POINTER_VALUE
697 # This is roughly half way between the top of user space and the bottom
698 # of kernel space, which seems about as good as we can get.
699 default 0x5deadbeef0000000 if PPC64
702 config ARCH_MEMORY_PROBE
704 depends on MEMORY_HOTPLUG
707 bool "Using standard binutils settings"
711 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
712 Note, that kernel will be able to run only those applications,
713 which had been compiled using binutils later than 2.17.50.0.3 with
714 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
715 the older binutils, you can patch them with a trivial patch, which
716 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
722 Select the kernel logical page size. Increasing the page size
723 will reduce software overhead at each page boundary, allow
724 hardware prefetch mechanisms to be more effective, and allow
725 larger dma transfers increasing IO efficiency and reducing
726 overhead. However the utilization of memory will increase.
727 For example, each cached file will using a multiple of the
728 page size to hold its contents and the difference between the
729 end of file and the end of page is wasted.
731 Some dedicated systems, such as software raid serving with
732 accelerated calculations, have shown significant increases.
734 If you configure a 64 bit kernel for 64k pages but the
735 processor does not support them, then the kernel will simulate
736 them with 4k pages, loading them on demand, but with the
737 reduced software overhead and larger internal fragmentation.
738 For the 32 bit kernel, a large page option will not be offered
739 unless it is supported by the configured processor.
741 If unsure, choose 4K_PAGES.
745 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
749 depends on 44x || PPC_8xx
753 depends on 44x || PPC_BOOK3S_64
754 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
756 config PPC_256K_PAGES
757 bool "256k page size"
758 depends on 44x && !STDBINUTILS
760 Make the page size 256k.
762 As the ELF standard only requires alignment to support page
763 sizes up to 64k, you will need to compile all of your user
764 space applications with a non-standard binutils settings
765 (see the STDBINUTILS description for details).
767 Say N unless you know what you are doing.
771 config PPC_PAGE_SHIFT
773 default 18 if PPC_256K_PAGES
774 default 16 if PPC_64K_PAGES
775 default 14 if PPC_16K_PAGES
779 int "Thread shift" if EXPERT
781 default "15" if PPC_256K_PAGES
782 default "14" if PPC64
783 default "14" if KASAN
786 Used to define the stack size. The default is almost always what you
787 want. Only change this if you know what you are doing.
789 config DATA_SHIFT_BOOL
790 bool "Set custom data alignment"
791 depends on ADVANCED_OPTIONS
792 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC
793 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && \
794 (!PIN_TLB_TEXT || !STRICT_KERNEL_RWX))
796 This option allows you to set the kernel data alignment. When
797 RAM is mapped by blocks, the alignment needs to fit the size and
798 number of possible blocks. The default should be OK for most configs.
800 Say N here unless you know what you are doing.
803 int "Data shift" if DATA_SHIFT_BOOL
804 default 24 if STRICT_KERNEL_RWX && PPC64
805 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_BOOK3S_32
806 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_8xx
807 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
808 default 18 if DEBUG_PAGEALLOC && PPC_BOOK3S_32
809 default 23 if STRICT_KERNEL_RWX && PPC_8xx
810 default 23 if DEBUG_PAGEALLOC && PPC_8xx && PIN_TLB_DATA
811 default 19 if DEBUG_PAGEALLOC && PPC_8xx
812 default PPC_PAGE_SHIFT
814 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
815 Smaller is the alignment, greater is the number of necessary DBATs.
817 On 8xx, large pages (512kb or 8M) are used to map kernel linear
818 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
819 in that case. If PIN_TLB is selected, it must be aligned to 8M as
820 8M pages will be pinned.
822 config FORCE_MAX_ZONEORDER
823 int "Maximum zone order"
824 range 8 9 if PPC64 && PPC_64K_PAGES
825 default "9" if PPC64 && PPC_64K_PAGES
826 range 13 13 if PPC64 && !PPC_64K_PAGES
827 default "13" if PPC64 && !PPC_64K_PAGES
828 range 9 64 if PPC32 && PPC_16K_PAGES
829 default "9" if PPC32 && PPC_16K_PAGES
830 range 7 64 if PPC32 && PPC_64K_PAGES
831 default "7" if PPC32 && PPC_64K_PAGES
832 range 5 64 if PPC32 && PPC_256K_PAGES
833 default "5" if PPC32 && PPC_256K_PAGES
837 The kernel memory allocator divides physically contiguous memory
838 blocks into "zones", where each zone is a power of two number of
839 pages. This option selects the largest power of two that the kernel
840 keeps in the memory allocator. If you need to allocate very large
841 blocks of physically contiguous memory, then you may need to
844 This config option is actually maximum order plus one. For example,
845 a value of 11 means that the largest free memory block is 2^10 pages.
847 The page size is not necessarily 4KB. For example, on 64-bit
848 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
849 this in mind when choosing a value for this option.
851 config PPC_SUBPAGE_PROT
852 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
854 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
856 This option adds support for system call to allow user programs
857 to set access permissions (read/write, readonly, or no access)
858 on the 4k subpages of each 64k page.
860 If unsure, say N here.
862 config PPC_COPRO_BASE
866 bool "SMT (Hyperthreading) scheduler support"
867 depends on PPC64 && SMP
869 SMT scheduler support improves the CPU scheduler's decision making
870 when dealing with POWER5 cpus at a cost of slightly increased
871 overhead in some places. If unsure say N here.
873 config PPC_DENORMALISATION
874 bool "PowerPC denormalisation exception handling"
875 depends on PPC_BOOK3S_64
876 default "y" if PPC_POWERNV
878 Add support for handling denormalisation of single precision
879 values. Useful for bare metal only. If unsure say Y here.
882 string "Initial kernel command string"
885 On some platforms, there is currently no way for the boot loader to
886 pass arguments to the kernel. For these platforms, you can supply
887 some command-line options at build time by entering them here. In
888 most cases you will need to specify the root device here.
891 prompt "Kernel command line type" if CMDLINE != ""
892 default CMDLINE_FROM_BOOTLOADER
894 config CMDLINE_FROM_BOOTLOADER
895 bool "Use bootloader kernel arguments if available"
897 Uses the command-line options passed by the boot loader. If
898 the boot loader doesn't provide any, the default kernel command
899 string provided in CMDLINE will be used.
901 config CMDLINE_EXTEND
902 bool "Extend bootloader kernel arguments"
904 The command-line arguments provided by the boot loader will be
905 appended to the default kernel command string.
908 bool "Always use the default kernel command string"
910 Always use the default kernel command string, even if the boot
911 loader passes other arguments to the kernel.
912 This is useful if you cannot or don't want to change the
913 command-line options your boot loader passes to the kernel.
918 string "Additional default image types"
920 List additional targets to be built by the bootwrapper here (separated
921 by spaces). This is useful for targets that depend of device tree
922 files in the .dts directory.
924 Targets in this list will be build as part of the default build
925 target, or when the user does a 'make zImage' or a
926 'make zImage.initrd'.
928 If unsure, leave blank
930 config ARCH_WANTS_FREEZER_CONTROL
934 source "kernel/power/Kconfig"
937 bool "Enable seccomp to safely compute untrusted bytecode"
941 This kernel feature is useful for number crunching applications
942 that may need to compute untrusted bytecode during their
943 execution. By using pipes or other transports made available to
944 the process as file descriptors supporting the read/write
945 syscalls, it's possible to isolate those applications in
946 their own address space using seccomp. Once seccomp is
947 enabled via /proc/<pid>/seccomp, it cannot be disabled
948 and the task is only allowed to execute a few safe syscalls
949 defined by each seccomp mode.
951 If unsure, say Y. Only embedded should say N here.
954 prompt "PowerPC Memory Protection Keys"
956 depends on PPC_BOOK3S_64
957 select ARCH_USES_HIGH_VMA_FLAGS
958 select ARCH_HAS_PKEYS
960 Memory Protection Keys provides a mechanism for enforcing
961 page-based protections, but without requiring modification of the
962 page tables when an application changes protection domains.
964 For details, see Documentation/core-api/protection-keys.rst
968 config PPC_SECURE_BOOT
969 prompt "Enable secure boot support"
971 depends on PPC_POWERNV
972 depends on IMA_ARCH_POLICY
973 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
975 Systems with firmware secure boot enabled need to define security
976 policies to extend secure boot to the OS. This config allows a user
977 to enable OS secure boot on systems that have firmware support for
978 it. If in doubt say N.
980 config PPC_SECVAR_SYSFS
981 bool "Enable sysfs interface for POWER secure variables"
983 depends on PPC_SECURE_BOOT
986 POWER secure variables are managed and controlled by firmware.
987 These variables are exposed to userspace via sysfs to enable
988 read/write operations on these variables. Say Y if you have
989 secure boot enabled and want to expose variables to userspace.
1000 bool "Support for ISA-bus hardware"
1004 Find out whether you have ISA slots on your motherboard. ISA is the
1005 name of a bus system, i.e. the way the CPU talks to the other stuff
1006 inside your box. If you have an Apple machine, say N here; if you
1007 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1008 embedded board, consult your board documentation.
1010 config GENERIC_ISA_DMA
1012 depends on ISA_DMA_API
1015 config PPC_INDIRECT_PCI
1018 default y if 40x || 44x
1028 select ARCH_HAS_DMA_SET_MASK
1029 select PPC_INDIRECT_PCI
1035 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1037 Freescale MPC85xx/MPC86xx power management controller support
1038 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1043 depends on SUSPEND && (44x || 40x)
1045 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1046 It also enables support for two different idle states (idle-wait
1053 bool "Freescale Local Bus support"
1055 Enables reporting of errors from the Freescale local bus
1056 controller. Also contains some common code used by
1057 drivers for specific local bus peripherals.
1061 depends on PPC_83xx || QUICC_ENGINE || CPM2
1063 Freescale General-purpose Timers support
1067 depends on PCI && 8260
1068 select PPC_INDIRECT_PCI
1072 bool "Freescale Embedded SRIO Controller support"
1073 depends on RAPIDIO = y && HAVE_RAPIDIO
1076 Include support for RapidIO controller on Freescale embedded
1077 processors (MPC8548, MPC8641, etc).
1081 config NONSTATIC_KERNEL
1084 menu "Advanced setup"
1087 config ADVANCED_OPTIONS
1088 bool "Prompt for advanced kernel configuration options"
1090 This option will enable prompting for a variety of advanced kernel
1091 configuration options. These options can cause the kernel to not
1092 work if they are set incorrectly, but can be used to optimize certain
1093 aspects of kernel memory management.
1095 Unless you know what you are doing, say N here.
1097 comment "Default settings for advanced configuration options are used"
1098 depends on !ADVANCED_OPTIONS
1100 config LOWMEM_SIZE_BOOL
1101 bool "Set maximum low memory"
1102 depends on ADVANCED_OPTIONS
1104 This option allows you to set the maximum amount of memory which
1105 will be used as "low memory", that is, memory which the kernel can
1106 access directly, without having to set up a kernel virtual mapping.
1107 This can be useful in optimizing the layout of kernel virtual
1110 Say N here unless you know what you are doing.
1113 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1114 default "0x30000000"
1116 config LOWMEM_CAM_NUM_BOOL
1117 bool "Set number of CAMs to use to map low memory"
1118 depends on ADVANCED_OPTIONS && FSL_BOOKE
1120 This option allows you to set the maximum number of CAM slots that
1121 will be used to map low memory. There are a limited number of slots
1122 available and even more limited number that will fit in the L1 MMU.
1123 However, using more entries will allow mapping more low memory. This
1124 can be useful in optimizing the layout of kernel virtual memory.
1126 Say N here unless you know what you are doing.
1128 config LOWMEM_CAM_NUM
1129 depends on FSL_BOOKE
1130 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1133 config DYNAMIC_MEMSTART
1134 bool "Enable page aligned dynamic load address for kernel"
1135 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1136 select NONSTATIC_KERNEL
1138 This option enables the kernel to be loaded at any page aligned
1139 physical address. The kernel creates a mapping from KERNELBASE to
1140 the address where the kernel is loaded. The page size here implies
1141 the TLB page size of the mapping for kernel on the particular platform.
1142 Please refer to the init code for finding the TLB page size.
1144 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1145 kernel image, where the only restriction is the page aligned kernel
1146 load address. When this option is enabled, the compile time physical
1147 address CONFIG_PHYSICAL_START is ignored.
1149 This option is overridden by CONFIG_RELOCATABLE
1151 config PAGE_OFFSET_BOOL
1152 bool "Set custom page offset address"
1153 depends on ADVANCED_OPTIONS
1155 This option allows you to set the kernel virtual address at which
1156 the kernel will map low memory. This can be useful in optimizing
1157 the virtual memory layout of the system.
1159 Say N here unless you know what you are doing.
1162 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1163 default "0xc0000000"
1165 config KERNEL_START_BOOL
1166 bool "Set custom kernel base address"
1167 depends on ADVANCED_OPTIONS
1169 This option allows you to set the kernel virtual address at which
1170 the kernel will be loaded. Normally this should match PAGE_OFFSET
1171 however there are times (like kdump) that one might not want them
1174 Say N here unless you know what you are doing.
1177 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1178 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1179 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1180 default "0xc0000000"
1182 config PHYSICAL_START_BOOL
1183 bool "Set physical address where the kernel is loaded"
1184 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1186 This gives the physical address where the kernel is loaded.
1188 Say N here unless you know what you are doing.
1190 config PHYSICAL_START
1191 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1192 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1193 default "0x00000000"
1195 config PHYSICAL_ALIGN
1197 default "0x04000000" if FSL_BOOKE
1199 This value puts the alignment restrictions on physical address
1200 where kernel is loaded and run from. Kernel is compiled for an
1201 address which meets above alignment restriction.
1203 config TASK_SIZE_BOOL
1204 bool "Set custom user task size"
1205 depends on ADVANCED_OPTIONS
1207 This option allows you to set the amount of virtual address space
1208 allocated to user tasks. This can be useful in optimizing the
1209 virtual memory layout of the system.
1211 Say N here unless you know what you are doing.
1214 hex "Size of user task space" if TASK_SIZE_BOOL
1215 default "0x80000000" if PPC_8xx
1216 default "0xc0000000"
1220 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1223 default "0xc000000000000000"
1226 default "0xc000000000000000"
1227 config PHYSICAL_START
1229 default "0x00000000"
1235 config PPC_LIB_RHEAP
1238 source "arch/powerpc/kvm/Kconfig"
1240 source "kernel/livepatch/Kconfig"