1 source "arch/powerpc/platforms/Kconfig.cputype"
15 config ARCH_PHYS_ADDR_T_64BIT
16 def_bool PPC64 || PHYS_64BIT
18 config ARCH_DMA_ADDR_T_64BIT
19 def_bool ARCH_PHYS_ADDR_T_64BIT
25 config ARCH_MMAP_RND_BITS_MAX
26 # On Book3S 64, the default virtual address space for 64-bit processes
27 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
28 # 32T of address space (2^45), which should ensure a reasonable gap
29 # between bottom-up and top-down allocations for applications that
30 # consume "normal" amounts of address space. Book3S 64 only supports 64K
32 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
33 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K)
35 # On all other 64-bit platforms (currently only Book3E), the virtual
36 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
37 # of address space (2^44). Only 4K page sizes are supported.
38 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K)
40 # For 32-bit, use the compat values, as they're the same.
41 default ARCH_MMAP_RND_COMPAT_BITS_MAX
43 config ARCH_MMAP_RND_BITS_MIN
44 # Allow randomisation to consume up to 1GB of address space (2^30).
45 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K)
46 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K)
48 # For 32-bit, use the compat values, as they're the same.
49 default ARCH_MMAP_RND_COMPAT_BITS_MIN
51 config ARCH_MMAP_RND_COMPAT_BITS_MAX
52 # Total virtual address space for 32-bit processes is 2^31 (2GB).
53 # Allow randomisation to consume up to 512MB of address space (2^29).
54 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K)
55 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K)
56 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K)
57 default 17 # 17 = 29 (512MB) - 12 (4K)
59 config ARCH_MMAP_RND_COMPAT_BITS_MIN
60 # Total virtual address space for 32-bit processes is 2^31 (2GB).
61 # Allow randomisation to consume up to 8MB of address space (2^23).
62 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K)
63 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K)
64 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K)
65 default 11 # 11 = 23 (8MB) - 12 (4K)
67 config HAVE_SETUP_PER_CPU_AREA
70 config NEED_PER_CPU_EMBED_FIRST_CHUNK
74 int "Number of virtual interrupt numbers"
78 This defines the number of virtual interrupt numbers the kernel
79 can manage. Virtual interrupt numbers are what you see in
80 /proc/interrupts. If you configure your system to have too few,
81 drivers will fail to load or worse - handle with care.
85 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
90 depends on HARDLOCKUP_DETECTOR
91 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
94 This is a placeholder when the powerpc hardlockup detector
95 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
96 seleted via the generic lockup detector menu which is why we
97 have no standalone config option for it here.
99 config STACKTRACE_SUPPORT
103 config TRACE_IRQFLAGS_SUPPORT
107 config LOCKDEP_SUPPORT
111 config RWSEM_GENERIC_SPINLOCK
114 config RWSEM_XCHGADD_ALGORITHM
118 config GENERIC_LOCKBREAK
121 depends on SMP && PREEMPT
123 config GENERIC_HWEIGHT
127 config ARCH_HAS_DMA_SET_COHERENT_MASK
134 # Please keep this list sorted alphabetically.
136 select ARCH_HAS_DEVMEM_IS_ALLOWED
137 select ARCH_HAS_DMA_SET_COHERENT_MASK
138 select ARCH_HAS_ELF_RANDOMIZE
139 select ARCH_HAS_FORTIFY_SOURCE
140 select ARCH_HAS_GCOV_PROFILE_ALL
141 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE
142 select ARCH_HAS_SG_CHAIN
143 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
144 select ARCH_HAS_UBSAN_SANITIZE_ALL
145 select ARCH_HAS_ZONE_DEVICE if PPC_BOOK3S_64
146 select ARCH_HAVE_NMI_SAFE_CMPXCHG
147 select ARCH_MIGHT_HAVE_PC_PARPORT
148 select ARCH_MIGHT_HAVE_PC_SERIO
149 select ARCH_SUPPORTS_ATOMIC_RMW
150 select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
151 select ARCH_USE_BUILTIN_BSWAP
152 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
153 select ARCH_WANT_IPC_PARSE_VERSION
154 select ARCH_WEAK_RELEASE_ACQUIRE
156 select BUILDTIME_EXTABLE_SORT
157 select CLONE_BACKWARDS
158 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
159 select EDAC_ATOMIC_SCRUB
161 select GENERIC_ATOMIC64 if PPC32
162 select GENERIC_CLOCKEVENTS
163 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
164 select GENERIC_CMOS_UPDATE
165 select GENERIC_CPU_AUTOPROBE
166 select GENERIC_IRQ_SHOW
167 select GENERIC_IRQ_SHOW_LEVEL
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_JUMP_LABEL
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_SECCOMP_FILTER
178 select HAVE_ARCH_TRACEHOOK
179 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION)
180 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
181 select HAVE_CBPF_JIT if !PPC64
182 select HAVE_CONTEXT_TRACKING if PPC64
183 select HAVE_DEBUG_KMEMLEAK
184 select HAVE_DEBUG_STACKOVERFLOW
185 select HAVE_DMA_API_DEBUG
186 select HAVE_DYNAMIC_FTRACE
187 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
188 select HAVE_EBPF_JIT if PPC64
189 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
190 select HAVE_FTRACE_MCOUNT_RECORD
191 select HAVE_FUNCTION_GRAPH_TRACER
192 select HAVE_FUNCTION_TRACER
193 select HAVE_GCC_PLUGINS
194 select HAVE_GENERIC_GUP
195 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
197 select HAVE_IOREMAP_PROT
198 select HAVE_IRQ_EXIT_ON_IRQ_STACK
199 select HAVE_KERNEL_GZIP
201 select HAVE_KPROBES_ON_FTRACE
202 select HAVE_KRETPROBES
203 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
205 select HAVE_MEMBLOCK_NODE_MAP
206 select HAVE_MOD_ARCH_SPECIFIC
207 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
208 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
210 select HAVE_OPTPROBES if PPC64
211 select HAVE_PERF_EVENTS
212 select HAVE_PERF_EVENTS_NMI if PPC64
213 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
214 select HAVE_PERF_REGS
215 select HAVE_PERF_USER_STACK_DUMP
216 select HAVE_RCU_TABLE_FREE if SMP
217 select HAVE_REGS_AND_STACK_ACCESS_API
218 select HAVE_SYSCALL_TRACEPOINTS
219 select HAVE_VIRT_CPU_ACCOUNTING
220 select HAVE_IRQ_TIME_ACCOUNTING
222 select IRQ_FORCED_THREADING
223 select MODULES_USE_ELF_RELA
226 select OF_EARLY_FLATTREE
227 select OF_RESERVED_MEM
228 select OLD_SIGACTION if PPC32
229 select OLD_SIGSUSPEND
231 select SYSCTL_EXCEPTION_TRACE
232 select VIRT_TO_BUS if !PPC64
234 # Please keep this list sorted alphabetically.
251 select COMPAT_BINFMT_ELF
252 select ARCH_WANT_OLD_COMPAT_IPC
253 select COMPAT_OLD_SIGACTION
255 config SYSVIPC_COMPAT
257 depends on COMPAT && SYSVIPC
260 # All PPC32s use generic nvram driver through ppc_md
265 config SCHED_OMIT_FRAME_POINTER
269 config ARCH_MAY_HAVE_PC_FDC
273 config PPC_UDBG_16550
277 config GENERIC_TBSYNC
279 default y if PPC32 && SMP
291 config SYS_SUPPORTS_APM_EMULATION
292 default y if PMAC_APM_EMU
298 Used to allow a board to specify it wants an ePAPR compliant wrapper.
301 config DEFAULT_UIMAGE
304 Used to allow a board to specify it wants a uImage built by default
307 config ARCH_HIBERNATION_POSSIBLE
311 config ARCH_SUSPEND_POSSIBLE
313 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
314 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
317 config PPC_DCR_NATIVE
327 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
330 config PPC_OF_PLATFORM_PCI
333 depends on PPC64 # not supported on 32 bits yet
336 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
337 depends on PPC32 || PPC_STD_MMU_64
340 config ARCH_SUPPORTS_UPROBES
343 config PPC_ADV_DEBUG_REGS
345 depends on 40x || BOOKE
348 config PPC_ADV_DEBUG_IACS
350 depends on PPC_ADV_DEBUG_REGS
354 config PPC_ADV_DEBUG_DACS
356 depends on PPC_ADV_DEBUG_REGS
359 config PPC_ADV_DEBUG_DVCS
361 depends on PPC_ADV_DEBUG_REGS
365 config PPC_ADV_DEBUG_DAC_RANGE
367 depends on PPC_ADV_DEBUG_REGS && 44x
374 config PGTABLE_LEVELS
377 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
380 source "init/Kconfig"
382 source "kernel/Kconfig.freezer"
384 source "arch/powerpc/sysdev/Kconfig"
385 source "arch/powerpc/platforms/Kconfig"
387 menu "Kernel options"
390 bool "High memory support"
393 source kernel/Kconfig.hz
394 source kernel/Kconfig.preempt
395 source "fs/Kconfig.binfmt"
397 config HUGETLB_PAGE_SIZE_VARIABLE
399 depends on HUGETLB_PAGE
402 config MATH_EMULATION
403 bool "Math emulation"
404 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
406 Some PowerPC chips designed for embedded applications do not have
407 a floating-point unit and therefore do not implement the
408 floating-point instructions in the PowerPC instruction set. If you
409 say Y here, the kernel will include code to emulate a floating-point
410 unit, which will allow programs that use floating-point
413 This is also useful to emulate missing (optional) instructions
414 such as fsqrt on cores that do have an FPU but do not implement
415 them (such as Freescale BookE).
418 prompt "Math emulation options"
419 default MATH_EMULATION_FULL
420 depends on MATH_EMULATION
422 config MATH_EMULATION_FULL
423 bool "Emulate all the floating point instructions"
425 Select this option will enable the kernel to support to emulate
426 all the floating point instructions. If your SoC doesn't have
427 a FPU, you should select this.
429 config MATH_EMULATION_HW_UNIMPLEMENTED
430 bool "Just emulate the FPU unimplemented instructions"
432 Select this if you know there does have a hardware FPU on your
433 SoC, but some floating point instructions are not implemented by that.
437 config PPC_TRANSACTIONAL_MEM
438 bool "Transactional Memory support for POWERPC"
439 depends on PPC_BOOK3S_64
445 Support user-mode Transactional Memory on POWERPC.
447 config LD_HEAD_STUB_CATCH
448 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
452 Very large kernels can cause linker branch stubs to be generated by
453 code in head_64.S, which moves the head text sections out of their
454 specified location. This option can work around the problem.
458 config DISABLE_MPROFILE_KERNEL
459 bool "Disable use of mprofile-kernel for kernel tracing"
460 depends on PPC64 && CPU_LITTLE_ENDIAN
463 Selecting this options disables use of the mprofile-kernel ABI for
464 kernel tracing. That will cause options such as live patching
465 (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
468 If you have a toolchain which supports mprofile-kernel, then you can
469 disable this. Otherwise leave it enabled. If you're not sure, say
472 config MPROFILE_KERNEL
473 depends on PPC64 && CPU_LITTLE_ENDIAN
474 def_bool !DISABLE_MPROFILE_KERNEL
480 bool "SWIOTLB support"
484 Support for IO bounce buffering for systems without an IOMMU.
485 This allows us to DMA to the full physical address space on
486 platforms where the size of a physical address is larger
487 than the bus address. Not all platforms support this.
490 bool "Support for enabling/disabling CPUs"
491 depends on SMP && (PPC_PSERIES || \
492 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
494 Say Y here to be able to disable and re-enable individual
495 CPUs at runtime on SMP machines.
497 Say N if you are unsure.
499 config ARCH_CPU_PROBE_RELEASE
501 depends on HOTPLUG_CPU
503 config ARCH_ENABLE_MEMORY_HOTPLUG
506 config ARCH_HAS_WALK_MEMORY
509 config ARCH_ENABLE_MEMORY_HOTREMOVE
512 config PPC64_SUPPORTS_MEMORY_FAILURE
513 bool "Add support for memory hwpoison"
514 depends on PPC_BOOK3S_64
515 default "y" if PPC_POWERNV
516 select ARCH_SUPPORTS_MEMORY_FAILURE
519 bool "kexec system call"
520 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
523 kexec is a system call that implements the ability to shutdown your
524 current kernel, and to start another kernel. It is like a reboot
525 but it is independent of the system firmware. And like a reboot
526 you can start any kernel with it, not just Linux.
528 The name comes from the similarity to the exec system call.
530 It is an ongoing process to be certain the hardware in a machine
531 is properly shutdown, so do not be surprised if this code does not
532 initially work for you. As of this writing the exact hardware
533 interface is strongly in flux, so no good recommendation can be
537 bool "kexec file based system call"
539 select HAVE_IMA_KEXEC
543 depends on CRYPTO_SHA256=y
545 This is a new version of the kexec system call. This call is
546 file based and takes in file descriptors as system call arguments
547 for kernel and initramfs as opposed to a list of segments as is the
548 case for the older kexec call.
551 bool "Build a relocatable kernel"
552 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
553 select NONSTATIC_KERNEL
554 select MODULE_REL_CRCS if MODVERSIONS
556 This builds a kernel image that is capable of running at the
557 location the kernel is loaded at. For ppc32, there is no any
558 alignment restrictions, and this feature is a superset of
559 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
560 16k-aligned base address. The kernel is linked as a
561 position-independent executable (PIE) and contains dynamic relocations
562 which are processed early in the bootup process.
564 One use is for the kexec on panic case where the recovery kernel
565 must live at a different physical address than the primary
568 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
569 it has been loaded at and the compile time physical addresses
570 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
571 setting can still be useful to bootwrappers that need to know the
572 load address of the kernel (eg. u-boot/mkimage).
574 config RELOCATABLE_TEST
575 bool "Test relocatable kernel"
576 depends on (PPC64 && RELOCATABLE)
579 This runs the relocatable kernel at the address it was initially
580 loaded at, which tends to be non-zero and therefore test the
584 bool "Build a dump capture kernel"
585 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
586 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
588 Build a kernel suitable for use as a dump capture kernel.
589 The same kernel binary can be used as production kernel and dump
593 bool "Firmware-assisted dump"
594 depends on PPC64 && PPC_RTAS
598 A robust mechanism to get reliable kernel crash dump with
599 assistance from firmware. This approach does not use kexec,
600 instead firmware assists in booting the capture kernel
601 while preserving memory contents. Firmware-assisted dump
602 is meant to be a kdump replacement offering robustness and
603 speed not possible without system firmware assistance.
608 bool "Distribute interrupts on all CPUs by default"
611 This option gives the kernel permission to distribute IRQs across
612 multiple CPUs. Saying N here will route all IRQs to the first
613 CPU. Generally saying Y is safe, although some problems have been
614 reported with SMP Power Macintoshes with this option enabled.
619 default y if SMP && PPC_PSERIES
625 depends on NEED_MULTIPLE_NODES
627 config USE_PERCPU_NUMA_NODE_ID
631 config HAVE_MEMORYLESS_NODES
635 config ARCH_SELECT_MEMORY_MODEL
639 config ARCH_FLATMEM_ENABLE
641 depends on (PPC64 && !NUMA) || PPC32
643 config ARCH_SPARSEMEM_ENABLE
646 select SPARSEMEM_VMEMMAP_ENABLE
648 config ARCH_SPARSEMEM_DEFAULT
650 depends on PPC_BOOK3S_64
652 config SYS_SUPPORTS_HUGETLBFS
655 config ILLEGAL_POINTER_VALUE
657 # This is roughly half way between the top of user space and the bottom
658 # of kernel space, which seems about as good as we can get.
659 default 0x5deadbeef0000000 if PPC64
664 config ARCH_MEMORY_PROBE
666 depends on MEMORY_HOTPLUG
668 # Some NUMA nodes have memory ranges that span
669 # other nodes. Even though a pfn is valid and
670 # between a node's start and end pfns, it may not
671 # reside on that node. See memmap_init_zone()
673 config NODES_SPAN_OTHER_NODES
675 depends on NEED_MULTIPLE_NODES
678 bool "Using standard binutils settings"
682 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
683 Note, that kernel will be able to run only those applications,
684 which had been compiled using binutils later than 2.17.50.0.3 with
685 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
686 the older binutils, you can patch them with a trivial patch, which
687 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
693 Select the kernel logical page size. Increasing the page size
694 will reduce software overhead at each page boundary, allow
695 hardware prefetch mechanisms to be more effective, and allow
696 larger dma transfers increasing IO efficiency and reducing
697 overhead. However the utilization of memory will increase.
698 For example, each cached file will using a multiple of the
699 page size to hold its contents and the difference between the
700 end of file and the end of page is wasted.
702 Some dedicated systems, such as software raid serving with
703 accelerated calculations, have shown significant increases.
705 If you configure a 64 bit kernel for 64k pages but the
706 processor does not support them, then the kernel will simulate
707 them with 4k pages, loading them on demand, but with the
708 reduced software overhead and larger internal fragmentation.
709 For the 32 bit kernel, a large page option will not be offered
710 unless it is supported by the configured processor.
712 If unsure, choose 4K_PAGES.
716 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
720 depends on 44x || PPC_8xx
724 depends on !PPC_FSL_BOOK3E && (44x || PPC_STD_MMU_64 || PPC_BOOK3E_64)
725 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
727 config PPC_256K_PAGES
728 bool "256k page size"
729 depends on 44x && !STDBINUTILS
731 Make the page size 256k.
733 As the ELF standard only requires alignment to support page
734 sizes up to 64k, you will need to compile all of your user
735 space applications with a non-standard binutils settings
736 (see the STDBINUTILS description for details).
738 Say N unless you know what you are doing.
743 int "Thread shift" if EXPERT
745 default "15" if PPC_256K_PAGES
746 default "14" if PPC64
749 Used to define the stack size. The default is almost always what you
750 want. Only change this if you know what you are doing.
752 config FORCE_MAX_ZONEORDER
753 int "Maximum zone order"
754 range 8 9 if PPC64 && PPC_64K_PAGES
755 default "9" if PPC64 && PPC_64K_PAGES
756 range 13 13 if PPC64 && !PPC_64K_PAGES
757 default "13" if PPC64 && !PPC_64K_PAGES
758 range 9 64 if PPC32 && PPC_16K_PAGES
759 default "9" if PPC32 && PPC_16K_PAGES
760 range 7 64 if PPC32 && PPC_64K_PAGES
761 default "7" if PPC32 && PPC_64K_PAGES
762 range 5 64 if PPC32 && PPC_256K_PAGES
763 default "5" if PPC32 && PPC_256K_PAGES
767 The kernel memory allocator divides physically contiguous memory
768 blocks into "zones", where each zone is a power of two number of
769 pages. This option selects the largest power of two that the kernel
770 keeps in the memory allocator. If you need to allocate very large
771 blocks of physically contiguous memory, then you may need to
774 This config option is actually maximum order plus one. For example,
775 a value of 11 means that the largest free memory block is 2^10 pages.
777 The page size is not necessarily 4KB. For example, on 64-bit
778 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
779 this in mind when choosing a value for this option.
781 config PPC_SUBPAGE_PROT
782 bool "Support setting protections for 4k subpages"
783 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
785 This option adds support for a system call to allow user programs
786 to set access permissions (read/write, readonly, or no access)
787 on the 4k subpages of each 64k page.
789 config PPC_COPRO_BASE
794 bool "SMT (Hyperthreading) scheduler support"
795 depends on PPC64 && SMP
797 SMT scheduler support improves the CPU scheduler's decision making
798 when dealing with POWER5 cpus at a cost of slightly increased
799 overhead in some places. If unsure say N here.
801 config PPC_DENORMALISATION
802 bool "PowerPC denormalisation exception handling"
803 depends on PPC_BOOK3S_64
804 default "y" if PPC_POWERNV
806 Add support for handling denormalisation of single precision
807 values. Useful for bare metal only. If unsure say Y here.
810 bool "Default bootloader kernel arguments"
813 string "Initial kernel command string"
814 depends on CMDLINE_BOOL
815 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
817 On some platforms, there is currently no way for the boot loader to
818 pass arguments to the kernel. For these platforms, you can supply
819 some command-line options at build time by entering them here. In
820 most cases you will need to specify the root device here.
823 bool "Always use the default kernel command string"
824 depends on CMDLINE_BOOL
826 Always use the default kernel command string, even if the boot
827 loader passes other arguments to the kernel.
828 This is useful if you cannot or don't want to change the
829 command-line options your boot loader passes to the kernel.
832 string "Additional default image types"
834 List additional targets to be built by the bootwrapper here (separated
835 by spaces). This is useful for targets that depend of device tree
836 files in the .dts directory.
838 Targets in this list will be build as part of the default build
839 target, or when the user does a 'make zImage' or a
840 'make zImage.initrd'.
842 If unsure, leave blank
844 config ARCH_WANTS_FREEZER_CONTROL
848 source kernel/power/Kconfig
851 bool "Enable seccomp to safely compute untrusted bytecode"
855 This kernel feature is useful for number crunching applications
856 that may need to compute untrusted bytecode during their
857 execution. By using pipes or other transports made available to
858 the process as file descriptors supporting the read/write
859 syscalls, it's possible to isolate those applications in
860 their own address space using seccomp. Once seccomp is
861 enabled via /proc/<pid>/seccomp, it cannot be disabled
862 and the task is only allowed to execute a few safe syscalls
863 defined by each seccomp mode.
865 If unsure, say Y. Only embedded should say N here.
876 bool "Support for ISA-bus hardware"
880 Find out whether you have ISA slots on your motherboard. ISA is the
881 name of a bus system, i.e. the way the CPU talks to the other stuff
882 inside your box. If you have an Apple machine, say N here; if you
883 have an IBM RS/6000 or pSeries machine, say Y. If you have an
884 embedded board, consult your board documentation.
890 config NEED_DMA_MAP_STATE
891 def_bool (PPC64 || NOT_COHERENT_CACHE)
893 config NEED_SG_DMA_LENGTH
896 config GENERIC_ISA_DMA
898 depends on ISA_DMA_API
901 config PPC_INDIRECT_PCI
904 default y if 40x || 44x
918 select PPC_INDIRECT_PCI
924 depends on SUSPEND && (PPC_85xx || PPC_86xx)
926 Freescale MPC85xx/MPC86xx power management controller support
927 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
932 depends on SUSPEND && (44x || 40x)
934 PPC4xx Clock Power Management (CPM) support (suspend/resume).
935 It also enables support for two different idle states (idle-wait
942 bool "Freescale Local Bus support"
944 Enables reporting of errors from the Freescale local bus
945 controller. Also contains some common code used by
946 drivers for specific local bus peripherals.
950 depends on PPC_83xx || QUICC_ENGINE || CPM2
952 Freescale General-purpose Timers support
954 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
958 # Platforms that what PCI turned unconditionally just do select PCI
959 # in their config node. Platforms that want to choose at config
960 # time should select PPC_PCI_CHOICE
961 config PPC_PCI_CHOICE
965 bool "PCI support" if PPC_PCI_CHOICE
966 default y if !40x && !CPM2 && !PPC_8xx && !PPC_83xx \
967 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
968 default PCI_QSPAN if PPC_8xx
969 select GENERIC_PCI_IOMAP
971 Find out whether your system includes a PCI bus. PCI is the name of
972 a bus system, i.e. the way the CPU talks to the other stuff inside
973 your box. If you say Y here, the kernel will include drivers and
974 infrastructure code to support PCI bus devices.
987 Say Y here if you have a system based on a Motorola 8xx-series
988 embedded processor with a QSPAN PCI interface, otherwise say N.
992 depends on PCI && 8260
993 select PPC_INDIRECT_PCI
996 source "drivers/pci/Kconfig"
998 source "drivers/pcmcia/Kconfig"
1005 tristate "RapidIO support"
1006 depends on HAS_RAPIDIO || PCI
1008 If you say Y here, the kernel will include drivers and
1009 infrastructure code to support RapidIO interconnect devices.
1012 bool "Freescale Embedded SRIO Controller support"
1013 depends on RAPIDIO = y && HAS_RAPIDIO
1016 Include support for RapidIO controller on Freescale embedded
1017 processors (MPC8548, MPC8641, etc).
1019 source "drivers/rapidio/Kconfig"
1023 config NONSTATIC_KERNEL
1027 menu "Advanced setup"
1030 config ADVANCED_OPTIONS
1031 bool "Prompt for advanced kernel configuration options"
1033 This option will enable prompting for a variety of advanced kernel
1034 configuration options. These options can cause the kernel to not
1035 work if they are set incorrectly, but can be used to optimize certain
1036 aspects of kernel memory management.
1038 Unless you know what you are doing, say N here.
1040 comment "Default settings for advanced configuration options are used"
1041 depends on !ADVANCED_OPTIONS
1043 config LOWMEM_SIZE_BOOL
1044 bool "Set maximum low memory"
1045 depends on ADVANCED_OPTIONS
1047 This option allows you to set the maximum amount of memory which
1048 will be used as "low memory", that is, memory which the kernel can
1049 access directly, without having to set up a kernel virtual mapping.
1050 This can be useful in optimizing the layout of kernel virtual
1053 Say N here unless you know what you are doing.
1056 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1057 default "0x30000000"
1059 config LOWMEM_CAM_NUM_BOOL
1060 bool "Set number of CAMs to use to map low memory"
1061 depends on ADVANCED_OPTIONS && FSL_BOOKE
1063 This option allows you to set the maximum number of CAM slots that
1064 will be used to map low memory. There are a limited number of slots
1065 available and even more limited number that will fit in the L1 MMU.
1066 However, using more entries will allow mapping more low memory. This
1067 can be useful in optimizing the layout of kernel virtual memory.
1069 Say N here unless you know what you are doing.
1071 config LOWMEM_CAM_NUM
1072 depends on FSL_BOOKE
1073 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1076 config DYNAMIC_MEMSTART
1077 bool "Enable page aligned dynamic load address for kernel"
1078 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1079 select NONSTATIC_KERNEL
1081 This option enables the kernel to be loaded at any page aligned
1082 physical address. The kernel creates a mapping from KERNELBASE to
1083 the address where the kernel is loaded. The page size here implies
1084 the TLB page size of the mapping for kernel on the particular platform.
1085 Please refer to the init code for finding the TLB page size.
1087 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1088 kernel image, where the only restriction is the page aligned kernel
1089 load address. When this option is enabled, the compile time physical
1090 address CONFIG_PHYSICAL_START is ignored.
1092 This option is overridden by CONFIG_RELOCATABLE
1094 config PAGE_OFFSET_BOOL
1095 bool "Set custom page offset address"
1096 depends on ADVANCED_OPTIONS
1098 This option allows you to set the kernel virtual address at which
1099 the kernel will map low memory. This can be useful in optimizing
1100 the virtual memory layout of the system.
1102 Say N here unless you know what you are doing.
1105 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1106 default "0xc0000000"
1108 config KERNEL_START_BOOL
1109 bool "Set custom kernel base address"
1110 depends on ADVANCED_OPTIONS
1112 This option allows you to set the kernel virtual address at which
1113 the kernel will be loaded. Normally this should match PAGE_OFFSET
1114 however there are times (like kdump) that one might not want them
1117 Say N here unless you know what you are doing.
1120 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1121 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1122 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1123 default "0xc0000000"
1125 config PHYSICAL_START_BOOL
1126 bool "Set physical address where the kernel is loaded"
1127 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1129 This gives the physical address where the kernel is loaded.
1131 Say N here unless you know what you are doing.
1133 config PHYSICAL_START
1134 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1135 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1136 default "0x00000000"
1138 config PHYSICAL_ALIGN
1140 default "0x04000000" if FSL_BOOKE
1142 This value puts the alignment restrictions on physical address
1143 where kernel is loaded and run from. Kernel is compiled for an
1144 address which meets above alignment restriction.
1146 config TASK_SIZE_BOOL
1147 bool "Set custom user task size"
1148 depends on ADVANCED_OPTIONS
1150 This option allows you to set the amount of virtual address space
1151 allocated to user tasks. This can be useful in optimizing the
1152 virtual memory layout of the system.
1154 Say N here unless you know what you are doing.
1157 hex "Size of user task space" if TASK_SIZE_BOOL
1158 default "0x80000000" if PPC_8xx
1159 default "0xc0000000"
1161 config CONSISTENT_SIZE_BOOL
1162 bool "Set custom consistent memory pool size"
1163 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1165 This option allows you to set the size of the
1166 consistent memory pool. This pool of virtual memory
1167 is used to make consistent memory allocations.
1169 config CONSISTENT_SIZE
1170 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1171 default "0x00200000" if NOT_COHERENT_CACHE
1174 bool "Pinned Kernel TLBs (860 ONLY)"
1175 depends on ADVANCED_OPTIONS && PPC_8xx && \
1176 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1179 bool "Pinned TLB for DATA"
1184 bool "Pinned TLB for IMMR"
1189 bool "Pinned TLB for TEXT"
1195 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1198 default "0xc000000000000000"
1201 default "0xc000000000000000"
1202 config PHYSICAL_START
1204 default "0x00000000"
1210 source "net/Kconfig"
1212 source "drivers/Kconfig"
1216 source "lib/Kconfig"
1218 source "arch/powerpc/Kconfig.debug"
1220 source "security/Kconfig"
1222 source "crypto/Kconfig"
1224 config PPC_LIB_RHEAP
1227 source "arch/powerpc/kvm/Kconfig"
1229 source "kernel/livepatch/Kconfig"
projects / mirror_ubuntu-bionic-kernel.git / blob