| blob | a8ee573fe610bd5e2d8191b4dffb05e134a6d3c2 |
1 source "arch/powerpc/platforms/Kconfig.cputype"
3 config PPC32
4 bool
5 default y if !PPC64
7 config 32BIT
8 bool
9 default y if PPC32
11 config 64BIT
12 bool
13 default y if PPC64
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
21 config MMU
22 bool
23 default y
25 config HAVE_SETUP_PER_CPU_AREA
26 def_bool PPC64
28 config NEED_PER_CPU_EMBED_FIRST_CHUNK
29 def_bool PPC64
31 config NR_IRQS
32 int "Number of virtual interrupt numbers"
33 range 32 32768
34 default "512"
35 help
36 This defines the number of virtual interrupt numbers the kernel
37 can manage. Virtual interrupt numbers are what you see in
38 /proc/interrupts. If you configure your system to have too few,
39 drivers will fail to load or worse - handle with care.
41 config STACKTRACE_SUPPORT
42 bool
43 default y
45 config TRACE_IRQFLAGS_SUPPORT
46 bool
47 default y
49 config LOCKDEP_SUPPORT
50 bool
51 default y
53 config RWSEM_GENERIC_SPINLOCK
54 bool
56 config RWSEM_XCHGADD_ALGORITHM
57 bool
58 default y
60 config GENERIC_LOCKBREAK
61 bool
62 default y
63 depends on SMP && PREEMPT
65 config ARCH_HAS_ILOG2_U32
66 bool
67 default y
69 config ARCH_HAS_ILOG2_U64
70 bool
71 default y if 64BIT
73 config GENERIC_HWEIGHT
74 bool
75 default y
77 config ARCH_HAS_DMA_SET_COHERENT_MASK
78 bool
80 config PPC
81 bool
82 default y
83 select BUILDTIME_EXTABLE_SORT
84 select ARCH_MIGHT_HAVE_PC_PARPORT
85 select ARCH_MIGHT_HAVE_PC_SERIO
86 select BINFMT_ELF
87 select ARCH_HAS_ELF_RANDOMIZE
88 select OF
89 select OF_EARLY_FLATTREE
90 select OF_RESERVED_MEM
91 select HAVE_FTRACE_MCOUNT_RECORD
92 select HAVE_DYNAMIC_FTRACE
93 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
94 select HAVE_FUNCTION_TRACER
95 select HAVE_FUNCTION_GRAPH_TRACER
96 select SYSCTL_EXCEPTION_TRACE
97 select VIRT_TO_BUS if !PPC64
98 select HAVE_IDE
99 select HAVE_IOREMAP_PROT
100 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
101 select HAVE_KPROBES
102 select HAVE_ARCH_KGDB
103 select HAVE_KRETPROBES
104 select HAVE_ARCH_TRACEHOOK
105 select HAVE_MEMBLOCK
106 select HAVE_MEMBLOCK_NODE_MAP
107 select HAVE_DMA_API_DEBUG
108 select HAVE_OPROFILE
109 select HAVE_DEBUG_KMEMLEAK
110 select ARCH_HAS_SG_CHAIN
111 select GENERIC_ATOMIC64 if PPC32
112 select HAVE_PERF_EVENTS
113 select HAVE_PERF_REGS
114 select HAVE_PERF_USER_STACK_DUMP
115 select HAVE_REGS_AND_STACK_ACCESS_API
116 select HAVE_HW_BREAKPOINT if PERF_EVENTS && PPC_BOOK3S_64
117 select ARCH_WANT_IPC_PARSE_VERSION
118 select SPARSE_IRQ
119 select IRQ_DOMAIN
120 select GENERIC_IRQ_SHOW
121 select GENERIC_IRQ_SHOW_LEVEL
122 select IRQ_FORCED_THREADING
123 select HAVE_RCU_TABLE_FREE if SMP
124 select HAVE_SYSCALL_TRACEPOINTS
125 select HAVE_CBPF_JIT if !PPC64
126 select HAVE_EBPF_JIT if PPC64
127 select HAVE_ARCH_JUMP_LABEL
128 select ARCH_HAVE_NMI_SAFE_CMPXCHG
129 select ARCH_HAS_GCOV_PROFILE_ALL
130 select GENERIC_SMP_IDLE_THREAD
131 select GENERIC_CMOS_UPDATE
132 select GENERIC_TIME_VSYSCALL_OLD
133 select GENERIC_CLOCKEVENTS
134 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
135 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
136 select GENERIC_STRNCPY_FROM_USER
137 select GENERIC_STRNLEN_USER
138 select HAVE_MOD_ARCH_SPECIFIC
139 select MODULES_USE_ELF_RELA
140 select CLONE_BACKWARDS
141 select ARCH_USE_BUILTIN_BSWAP
142 select OLD_SIGSUSPEND
143 select OLD_SIGACTION if PPC32
144 select HAVE_DEBUG_STACKOVERFLOW
145 select HAVE_IRQ_EXIT_ON_IRQ_STACK
146 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
147 select HAVE_ARCH_AUDITSYSCALL
148 select ARCH_SUPPORTS_ATOMIC_RMW
149 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
150 select NO_BOOTMEM
151 select HAVE_GENERIC_RCU_GUP
152 select HAVE_PERF_EVENTS_NMI if PPC64
153 select HAVE_NMI if PERF_EVENTS
154 select EDAC_SUPPORT
155 select EDAC_ATOMIC_SCRUB
156 select ARCH_HAS_DMA_SET_COHERENT_MASK
157 select ARCH_HAS_DEVMEM_IS_ALLOWED
158 select HAVE_ARCH_SECCOMP_FILTER
159 select ARCH_HAS_UBSAN_SANITIZE_ALL
160 select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
161 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
162 select GENERIC_CPU_AUTOPROBE
163 select HAVE_VIRT_CPU_ACCOUNTING
164 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE
165 select HAVE_ARCH_HARDENED_USERCOPY
166 select HAVE_KERNEL_GZIP
167 select HAVE_CC_STACKPROTECTOR
169 config GENERIC_CSUM
170 def_bool CPU_LITTLE_ENDIAN
172 config EARLY_PRINTK
173 bool
174 default y
176 config PANIC_TIMEOUT
177 int
178 default 180
180 config COMPAT
181 bool
182 default y if PPC64
183 select COMPAT_BINFMT_ELF
184 select ARCH_WANT_OLD_COMPAT_IPC
185 select COMPAT_OLD_SIGACTION
187 config SYSVIPC_COMPAT
188 bool
189 depends on COMPAT && SYSVIPC
190 default y
192 # All PPC32s use generic nvram driver through ppc_md
193 config GENERIC_NVRAM
194 bool
195 default y if PPC32
197 config SCHED_OMIT_FRAME_POINTER
198 bool
199 default y
201 config ARCH_MAY_HAVE_PC_FDC
202 bool
203 default PCI
205 config PPC_UDBG_16550
206 bool
207 default n
209 config GENERIC_TBSYNC
210 bool
211 default y if PPC32 && SMP
212 default n
214 config AUDIT_ARCH
215 bool
216 default y
218 config GENERIC_BUG
219 bool
220 default y
221 depends on BUG
223 config SYS_SUPPORTS_APM_EMULATION
224 default y if PMAC_APM_EMU
225 bool
227 config EPAPR_BOOT
228 bool
229 help
230 Used to allow a board to specify it wants an ePAPR compliant wrapper.
231 default n
233 config DEFAULT_UIMAGE
234 bool
235 help
236 Used to allow a board to specify it wants a uImage built by default
237 default n
239 config ARCH_HIBERNATION_POSSIBLE
240 bool
241 default y
243 config ARCH_SUSPEND_POSSIBLE
244 def_bool y
245 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
246 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
247 || 44x || 40x
249 config PPC_DCR_NATIVE
250 bool
251 default n
253 config PPC_DCR_MMIO
254 bool
255 default n
257 config PPC_DCR
258 bool
259 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
260 default y
262 config PPC_OF_PLATFORM_PCI
263 bool
264 depends on PCI
265 depends on PPC64 # not supported on 32 bits yet
266 default n
268 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
269 depends on PPC32 || PPC_STD_MMU_64
270 def_bool y
272 config ARCH_SUPPORTS_UPROBES
273 def_bool y
275 config PPC_ADV_DEBUG_REGS
276 bool
277 depends on 40x || BOOKE
278 default y
280 config PPC_ADV_DEBUG_IACS
281 int
282 depends on PPC_ADV_DEBUG_REGS
283 default 4 if 44x
284 default 2
286 config PPC_ADV_DEBUG_DACS
287 int
288 depends on PPC_ADV_DEBUG_REGS
289 default 2
291 config PPC_ADV_DEBUG_DVCS
292 int
293 depends on PPC_ADV_DEBUG_REGS
294 default 2 if 44x
295 default 0
297 config PPC_ADV_DEBUG_DAC_RANGE
298 bool
299 depends on PPC_ADV_DEBUG_REGS && 44x
300 default y
302 config PPC_EMULATE_SSTEP
303 bool
304 default y if KPROBES || UPROBES || XMON || HAVE_HW_BREAKPOINT
306 config ZONE_DMA32
307 bool
308 default y if PPC64
310 config PGTABLE_LEVELS
311 int
312 default 2 if !PPC64
313 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
314 default 4
316 source "init/Kconfig"
318 source "kernel/Kconfig.freezer"
320 source "arch/powerpc/sysdev/Kconfig"
321 source "arch/powerpc/platforms/Kconfig"
323 menu "Kernel options"
325 config HIGHMEM
326 bool "High memory support"
327 depends on PPC32
329 source kernel/Kconfig.hz
330 source kernel/Kconfig.preempt
331 source "fs/Kconfig.binfmt"
333 config HUGETLB_PAGE_SIZE_VARIABLE
334 bool
335 depends on HUGETLB_PAGE
336 default y
338 config MATH_EMULATION
339 bool "Math emulation"
340 depends on 4xx || 8xx || PPC_MPC832x || BOOKE
341 ---help---
342 Some PowerPC chips designed for embedded applications do not have
343 a floating-point unit and therefore do not implement the
344 floating-point instructions in the PowerPC instruction set. If you
345 say Y here, the kernel will include code to emulate a floating-point
346 unit, which will allow programs that use floating-point
347 instructions to run.
349 This is also useful to emulate missing (optional) instructions
350 such as fsqrt on cores that do have an FPU but do not implement
351 them (such as Freescale BookE).
353 choice
354 prompt "Math emulation options"
355 default MATH_EMULATION_FULL
356 depends on MATH_EMULATION
358 config MATH_EMULATION_FULL
359 bool "Emulate all the floating point instructions"
360 ---help---
361 Select this option will enable the kernel to support to emulate
362 all the floating point instructions. If your SoC doesn't have
363 a FPU, you should select this.
365 config MATH_EMULATION_HW_UNIMPLEMENTED
366 bool "Just emulate the FPU unimplemented instructions"
367 ---help---
368 Select this if you know there does have a hardware FPU on your
369 SoC, but some floating point instructions are not implemented by that.
371 endchoice
373 config PPC_TRANSACTIONAL_MEM
374 bool "Transactional Memory support for POWERPC"
375 depends on PPC_BOOK3S_64
376 depends on SMP
377 select ALTIVEC
378 select VSX
379 default n
380 ---help---
381 Support user-mode Transactional Memory on POWERPC.
383 config DISABLE_MPROFILE_KERNEL
384 bool "Disable use of mprofile-kernel for kernel tracing"
385 depends on PPC64 && CPU_LITTLE_ENDIAN
386 default y
387 help
388 Selecting this options disables use of the mprofile-kernel ABI for
389 kernel tracing. That will cause options such as live patching
390 (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
391 be disabled also.
393 If you have a toolchain which supports mprofile-kernel, then you can
394 enable this. Otherwise leave it disabled. If you're not sure, say
395 "N".
397 config MPROFILE_KERNEL
398 depends on PPC64 && CPU_LITTLE_ENDIAN
399 def_bool !DISABLE_MPROFILE_KERNEL
401 config USE_THIN_ARCHIVES
402 bool "Build the kernel using thin archives"
403 default n
404 select THIN_ARCHIVES
405 help
406 Build the kernel using thin archives.
407 If you're unsure say N.
409 config IOMMU_HELPER
410 def_bool PPC64
412 config SWIOTLB
413 bool "SWIOTLB support"
414 default n
415 select IOMMU_HELPER
416 ---help---
417 Support for IO bounce buffering for systems without an IOMMU.
418 This allows us to DMA to the full physical address space on
419 platforms where the size of a physical address is larger
420 than the bus address. Not all platforms support this.
422 config HOTPLUG_CPU
423 bool "Support for enabling/disabling CPUs"
424 depends on SMP && (PPC_PSERIES || \
425 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
426 ---help---
427 Say Y here to be able to disable and re-enable individual
428 CPUs at runtime on SMP machines.
430 Say N if you are unsure.
432 config ARCH_CPU_PROBE_RELEASE
433 def_bool y
434 depends on HOTPLUG_CPU
436 config ARCH_ENABLE_MEMORY_HOTPLUG
437 def_bool y
439 config ARCH_HAS_WALK_MEMORY
440 def_bool y
442 config ARCH_ENABLE_MEMORY_HOTREMOVE
443 def_bool y
445 config PPC64_SUPPORTS_MEMORY_FAILURE
446 bool "Add support for memory hwpoison"
447 depends on PPC_BOOK3S_64
448 default "y" if PPC_POWERNV
449 select ARCH_SUPPORTS_MEMORY_FAILURE
451 config KEXEC
452 bool "kexec system call"
453 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
454 select KEXEC_CORE
455 help
456 kexec is a system call that implements the ability to shutdown your
457 current kernel, and to start another kernel. It is like a reboot
458 but it is independent of the system firmware. And like a reboot
459 you can start any kernel with it, not just Linux.
461 The name comes from the similarity to the exec system call.
463 It is an ongoing process to be certain the hardware in a machine
464 is properly shutdown, so do not be surprised if this code does not
465 initially work for you. As of this writing the exact hardware
466 interface is strongly in flux, so no good recommendation can be
467 made.
469 config KEXEC_FILE
470 bool "kexec file based system call"
471 select KEXEC_CORE
472 select HAVE_IMA_KEXEC
473 select BUILD_BIN2C
474 depends on PPC64
475 depends on CRYPTO=y
476 depends on CRYPTO_SHA256=y
477 help
478 This is a new version of the kexec system call. This call is
479 file based and takes in file descriptors as system call arguments
480 for kernel and initramfs as opposed to a list of segments as is the
481 case for the older kexec call.
483 config RELOCATABLE
484 bool "Build a relocatable kernel"
485 depends on (PPC64 && !COMPILE_TEST) || (FLATMEM && (44x || FSL_BOOKE))
486 select NONSTATIC_KERNEL
487 help
488 This builds a kernel image that is capable of running at the
489 location the kernel is loaded at. For ppc32, there is no any
490 alignment restrictions, and this feature is a superset of
491 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
492 16k-aligned base address. The kernel is linked as a
493 position-independent executable (PIE) and contains dynamic relocations
494 which are processed early in the bootup process.
496 One use is for the kexec on panic case where the recovery kernel
497 must live at a different physical address than the primary
498 kernel.
500 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
501 it has been loaded at and the compile time physical addresses
502 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
503 setting can still be useful to bootwrappers that need to know the
504 load address of the kernel (eg. u-boot/mkimage).
506 config RELOCATABLE_TEST
507 bool "Test relocatable kernel"
508 depends on (PPC64 && RELOCATABLE)
509 default n
510 help
511 This runs the relocatable kernel at the address it was initially
512 loaded at, which tends to be non-zero and therefore test the
513 relocation code.
515 config CRASH_DUMP
516 bool "Build a kdump crash kernel"
517 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
518 select RELOCATABLE if (PPC64 && !COMPILE_TEST) || 44x || FSL_BOOKE
519 help
520 Build a kernel suitable for use as a kdump capture kernel.
521 The same kernel binary can be used as production kernel and dump
522 capture kernel.
524 config FA_DUMP
525 bool "Firmware-assisted dump"
526 depends on PPC64 && PPC_RTAS && CRASH_DUMP && KEXEC_CORE
527 help
528 A robust mechanism to get reliable kernel crash dump with
529 assistance from firmware. This approach does not use kexec,
530 instead firmware assists in booting the kdump kernel
531 while preserving memory contents. Firmware-assisted dump
532 is meant to be a kdump replacement offering robustness and
533 speed not possible without system firmware assistance.
535 If unsure, say "N"
537 config IRQ_ALL_CPUS
538 bool "Distribute interrupts on all CPUs by default"
539 depends on SMP
540 help
541 This option gives the kernel permission to distribute IRQs across
542 multiple CPUs. Saying N here will route all IRQs to the first
543 CPU. Generally saying Y is safe, although some problems have been
544 reported with SMP Power Macintoshes with this option enabled.
546 config NUMA
547 bool "NUMA support"
548 depends on PPC64
549 default y if SMP && PPC_PSERIES
551 config NODES_SHIFT
552 int
553 default "8" if PPC64
554 default "4"
555 depends on NEED_MULTIPLE_NODES
557 config USE_PERCPU_NUMA_NODE_ID
558 def_bool y
559 depends on NUMA
561 config HAVE_MEMORYLESS_NODES
562 def_bool y
563 depends on NUMA
565 config ARCH_SELECT_MEMORY_MODEL
566 def_bool y
567 depends on PPC64
569 config ARCH_FLATMEM_ENABLE
570 def_bool y
571 depends on (PPC64 && !NUMA) || PPC32
573 config ARCH_SPARSEMEM_ENABLE
574 def_bool y
575 depends on PPC64
576 select SPARSEMEM_VMEMMAP_ENABLE
578 config ARCH_SPARSEMEM_DEFAULT
579 def_bool y
580 depends on (SMP && PPC_PSERIES) || PPC_PS3
582 config SYS_SUPPORTS_HUGETLBFS
583 bool
585 config ILLEGAL_POINTER_VALUE
586 hex
587 # This is roughly half way between the top of user space and the bottom
588 # of kernel space, which seems about as good as we can get.
589 default 0x5deadbeef0000000 if PPC64
590 default 0
592 source "mm/Kconfig"
594 config ARCH_MEMORY_PROBE
595 def_bool y
596 depends on MEMORY_HOTPLUG
598 # Some NUMA nodes have memory ranges that span
599 # other nodes. Even though a pfn is valid and
600 # between a node's start and end pfns, it may not
601 # reside on that node. See memmap_init_zone()
602 # for details.
603 config NODES_SPAN_OTHER_NODES
604 def_bool y
605 depends on NEED_MULTIPLE_NODES
607 config STDBINUTILS
608 bool "Using standard binutils settings"
609 depends on 44x
610 default y
611 help
612 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
613 Note, that kernel will be able to run only those applications,
614 which had been compiled using binutils later than 2.17.50.0.3 with
615 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
616 the older binutils, you can patch them with a trivial patch, which
617 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
619 choice
620 prompt "Page size"
621 default PPC_4K_PAGES
622 help
623 Select the kernel logical page size. Increasing the page size
624 will reduce software overhead at each page boundary, allow
625 hardware prefetch mechanisms to be more effective, and allow
626 larger dma transfers increasing IO efficiency and reducing
627 overhead. However the utilization of memory will increase.
628 For example, each cached file will using a multiple of the
629 page size to hold its contents and the difference between the
630 end of file and the end of page is wasted.
632 Some dedicated systems, such as software raid serving with
633 accelerated calculations, have shown significant increases.
635 If you configure a 64 bit kernel for 64k pages but the
636 processor does not support them, then the kernel will simulate
637 them with 4k pages, loading them on demand, but with the
638 reduced software overhead and larger internal fragmentation.
639 For the 32 bit kernel, a large page option will not be offered
640 unless it is supported by the configured processor.
642 If unsure, choose 4K_PAGES.
644 config PPC_4K_PAGES
645 bool "4k page size"
646 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
648 config PPC_16K_PAGES
649 bool "16k page size"
650 depends on 44x || PPC_8xx
652 config PPC_64K_PAGES
653 bool "64k page size"
654 depends on !PPC_FSL_BOOK3E && (44x || PPC_STD_MMU_64 || PPC_BOOK3E_64)
655 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
657 config PPC_256K_PAGES
658 bool "256k page size"
659 depends on 44x && !STDBINUTILS
660 help
661 Make the page size 256k.
663 As the ELF standard only requires alignment to support page
664 sizes up to 64k, you will need to compile all of your user
665 space applications with a non-standard binutils settings
666 (see the STDBINUTILS description for details).
668 Say N unless you know what you are doing.
670 endchoice
672 config FORCE_MAX_ZONEORDER
673 int "Maximum zone order"
674 range 8 9 if PPC64 && PPC_64K_PAGES
675 default "9" if PPC64 && PPC_64K_PAGES
676 range 13 13 if PPC64 && !PPC_64K_PAGES
677 default "13" if PPC64 && !PPC_64K_PAGES
678 range 9 64 if PPC32 && PPC_16K_PAGES
679 default "9" if PPC32 && PPC_16K_PAGES
680 range 7 64 if PPC32 && PPC_64K_PAGES
681 default "7" if PPC32 && PPC_64K_PAGES
682 range 5 64 if PPC32 && PPC_256K_PAGES
683 default "5" if PPC32 && PPC_256K_PAGES
684 range 11 64
685 default "11"
686 help
687 The kernel memory allocator divides physically contiguous memory
688 blocks into "zones", where each zone is a power of two number of
689 pages. This option selects the largest power of two that the kernel
690 keeps in the memory allocator. If you need to allocate very large
691 blocks of physically contiguous memory, then you may need to
692 increase this value.
694 This config option is actually maximum order plus one. For example,
695 a value of 11 means that the largest free memory block is 2^10 pages.
697 The page size is not necessarily 4KB. For example, on 64-bit
698 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
699 this in mind when choosing a value for this option.
701 config PPC_SUBPAGE_PROT
702 bool "Support setting protections for 4k subpages"
703 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
704 help
705 This option adds support for a system call to allow user programs
706 to set access permissions (read/write, readonly, or no access)
707 on the 4k subpages of each 64k page.
709 config PPC_COPRO_BASE
710 bool
711 default n
713 config SCHED_SMT
714 bool "SMT (Hyperthreading) scheduler support"
715 depends on PPC64 && SMP
716 help
717 SMT scheduler support improves the CPU scheduler's decision making
718 when dealing with POWER5 cpus at a cost of slightly increased
719 overhead in some places. If unsure say N here.
721 config PPC_DENORMALISATION
722 bool "PowerPC denormalisation exception handling"
723 depends on PPC_BOOK3S_64
724 default "y" if PPC_POWERNV
725 ---help---
726 Add support for handling denormalisation of single precision
727 values. Useful for bare metal only. If unsure say Y here.
729 config CMDLINE_BOOL
730 bool "Default bootloader kernel arguments"
732 config CMDLINE
733 string "Initial kernel command string"
734 depends on CMDLINE_BOOL
735 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
736 help
737 On some platforms, there is currently no way for the boot loader to
738 pass arguments to the kernel. For these platforms, you can supply
739 some command-line options at build time by entering them here. In
740 most cases you will need to specify the root device here.
742 config CMDLINE_FORCE
743 bool "Always use the default kernel command string"
744 depends on CMDLINE_BOOL
745 help
746 Always use the default kernel command string, even if the boot
747 loader passes other arguments to the kernel.
748 This is useful if you cannot or don't want to change the
749 command-line options your boot loader passes to the kernel.
751 config EXTRA_TARGETS
752 string "Additional default image types"
753 help
754 List additional targets to be built by the bootwrapper here (separated
755 by spaces). This is useful for targets that depend of device tree
756 files in the .dts directory.
758 Targets in this list will be build as part of the default build
759 target, or when the user does a 'make zImage' or a
760 'make zImage.initrd'.
762 If unsure, leave blank
764 config ARCH_WANTS_FREEZER_CONTROL
765 def_bool y
766 depends on ADB_PMU
768 source kernel/power/Kconfig
770 config SECCOMP
771 bool "Enable seccomp to safely compute untrusted bytecode"
772 depends on PROC_FS
773 default y
774 help
775 This kernel feature is useful for number crunching applications
776 that may need to compute untrusted bytecode during their
777 execution. By using pipes or other transports made available to
778 the process as file descriptors supporting the read/write
779 syscalls, it's possible to isolate those applications in
780 their own address space using seccomp. Once seccomp is
781 enabled via /proc/<pid>/seccomp, it cannot be disabled
782 and the task is only allowed to execute a few safe syscalls
783 defined by each seccomp mode.
785 If unsure, say Y. Only embedded should say N here.
787 endmenu
789 config ISA_DMA_API
790 bool
791 default PCI
793 menu "Bus options"
795 config ISA
796 bool "Support for ISA-bus hardware"
797 depends on PPC_CHRP
798 select PPC_I8259
799 help
800 Find out whether you have ISA slots on your motherboard. ISA is the
801 name of a bus system, i.e. the way the CPU talks to the other stuff
802 inside your box. If you have an Apple machine, say N here; if you
803 have an IBM RS/6000 or pSeries machine, say Y. If you have an
804 embedded board, consult your board documentation.
806 config ZONE_DMA
807 bool
808 default y
810 config NEED_DMA_MAP_STATE
811 def_bool (PPC64 || NOT_COHERENT_CACHE)
813 config NEED_SG_DMA_LENGTH
814 def_bool y
816 config GENERIC_ISA_DMA
817 bool
818 depends on ISA_DMA_API
819 default y
821 config PPC_INDIRECT_PCI
822 bool
823 depends on PCI
824 default y if 40x || 44x
825 default n
827 config EISA
828 bool
830 config SBUS
831 bool
833 config FSL_SOC
834 bool
836 config FSL_PCI
837 bool
838 select PPC_INDIRECT_PCI
839 select PCI_QUIRKS
841 config FSL_PMC
842 bool
843 default y
844 depends on SUSPEND && (PPC_85xx || PPC_86xx)
845 help
846 Freescale MPC85xx/MPC86xx power management controller support
847 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
849 config PPC4xx_CPM
850 bool
851 default y
852 depends on SUSPEND && (44x || 40x)
853 help
854 PPC4xx Clock Power Management (CPM) support (suspend/resume).
855 It also enables support for two different idle states (idle-wait
856 and idle-doze).
858 config 4xx_SOC
859 bool
861 config FSL_LBC
862 bool "Freescale Local Bus support"
863 help
864 Enables reporting of errors from the Freescale local bus
865 controller. Also contains some common code used by
866 drivers for specific local bus peripherals.
868 config FSL_GTM
869 bool
870 depends on PPC_83xx || QUICC_ENGINE || CPM2
871 help
872 Freescale General-purpose Timers support
874 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
875 config MCA
876 bool
878 # Platforms that what PCI turned unconditionally just do select PCI
879 # in their config node. Platforms that want to choose at config
880 # time should select PPC_PCI_CHOICE
881 config PPC_PCI_CHOICE
882 bool
884 config PCI
885 bool "PCI support" if PPC_PCI_CHOICE
886 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
887 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
888 default PCI_QSPAN if !4xx && !CPM2 && 8xx
889 select GENERIC_PCI_IOMAP
890 help
891 Find out whether your system includes a PCI bus. PCI is the name of
892 a bus system, i.e. the way the CPU talks to the other stuff inside
893 your box. If you say Y here, the kernel will include drivers and
894 infrastructure code to support PCI bus devices.
896 config PCI_DOMAINS
897 def_bool PCI
899 config PCI_SYSCALL
900 def_bool PCI
902 config PCI_QSPAN
903 bool "QSpan PCI"
904 depends on !4xx && !CPM2 && 8xx
905 select PPC_I8259
906 help
907 Say Y here if you have a system based on a Motorola 8xx-series
908 embedded processor with a QSPAN PCI interface, otherwise say N.
910 config PCI_8260
911 bool
912 depends on PCI && 8260
913 select PPC_INDIRECT_PCI
914 default y
916 source "drivers/pci/Kconfig"
918 source "drivers/pcmcia/Kconfig"
920 config HAS_RAPIDIO
921 bool
922 default n
924 config RAPIDIO
925 tristate "RapidIO support"
926 depends on HAS_RAPIDIO || PCI
927 help
928 If you say Y here, the kernel will include drivers and
929 infrastructure code to support RapidIO interconnect devices.
931 config FSL_RIO
932 bool "Freescale Embedded SRIO Controller support"
933 depends on RAPIDIO = y && HAS_RAPIDIO
934 default "n"
935 ---help---
936 Include support for RapidIO controller on Freescale embedded
937 processors (MPC8548, MPC8641, etc).
939 source "drivers/rapidio/Kconfig"
941 endmenu
943 config NONSTATIC_KERNEL
944 bool
945 default n
947 menu "Advanced setup"
948 depends on PPC32
950 config ADVANCED_OPTIONS
951 bool "Prompt for advanced kernel configuration options"
952 help
953 This option will enable prompting for a variety of advanced kernel
954 configuration options. These options can cause the kernel to not
955 work if they are set incorrectly, but can be used to optimize certain
956 aspects of kernel memory management.
958 Unless you know what you are doing, say N here.
960 comment "Default settings for advanced configuration options are used"
961 depends on !ADVANCED_OPTIONS
963 config LOWMEM_SIZE_BOOL
964 bool "Set maximum low memory"
965 depends on ADVANCED_OPTIONS
966 help
967 This option allows you to set the maximum amount of memory which
968 will be used as "low memory", that is, memory which the kernel can
969 access directly, without having to set up a kernel virtual mapping.
970 This can be useful in optimizing the layout of kernel virtual
971 memory.
973 Say N here unless you know what you are doing.
975 config LOWMEM_SIZE
976 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
977 default "0x30000000"
979 config LOWMEM_CAM_NUM_BOOL
980 bool "Set number of CAMs to use to map low memory"
981 depends on ADVANCED_OPTIONS && FSL_BOOKE
982 help
983 This option allows you to set the maximum number of CAM slots that
984 will be used to map low memory. There are a limited number of slots
985 available and even more limited number that will fit in the L1 MMU.
986 However, using more entries will allow mapping more low memory. This
987 can be useful in optimizing the layout of kernel virtual memory.
989 Say N here unless you know what you are doing.
991 config LOWMEM_CAM_NUM
992 depends on FSL_BOOKE
993 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
994 default 3
996 config DYNAMIC_MEMSTART
997 bool "Enable page aligned dynamic load address for kernel"
998 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
999 select NONSTATIC_KERNEL
1000 help
1001 This option enables the kernel to be loaded at any page aligned
1002 physical address. The kernel creates a mapping from KERNELBASE to
1003 the address where the kernel is loaded. The page size here implies
1004 the TLB page size of the mapping for kernel on the particular platform.
1005 Please refer to the init code for finding the TLB page size.
1007 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1008 kernel image, where the only restriction is the page aligned kernel
1009 load address. When this option is enabled, the compile time physical
1010 address CONFIG_PHYSICAL_START is ignored.
1012 This option is overridden by CONFIG_RELOCATABLE
1014 config PAGE_OFFSET_BOOL
1015 bool "Set custom page offset address"
1016 depends on ADVANCED_OPTIONS
1017 help
1018 This option allows you to set the kernel virtual address at which
1019 the kernel will map low memory. This can be useful in optimizing
1020 the virtual memory layout of the system.
1022 Say N here unless you know what you are doing.
1024 config PAGE_OFFSET
1025 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1026 default "0xc0000000"
1028 config KERNEL_START_BOOL
1029 bool "Set custom kernel base address"
1030 depends on ADVANCED_OPTIONS
1031 help
1032 This option allows you to set the kernel virtual address at which
1033 the kernel will be loaded. Normally this should match PAGE_OFFSET
1034 however there are times (like kdump) that one might not want them
1035 to be the same.
1037 Say N here unless you know what you are doing.
1039 config KERNEL_START
1040 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1041 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1042 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1043 default "0xc0000000"
1045 config PHYSICAL_START_BOOL
1046 bool "Set physical address where the kernel is loaded"
1047 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1048 help
1049 This gives the physical address where the kernel is loaded.
1051 Say N here unless you know what you are doing.
1053 config PHYSICAL_START
1054 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1055 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1056 default "0x00000000"
1058 config PHYSICAL_ALIGN
1059 hex
1060 default "0x04000000" if FSL_BOOKE
1061 help
1062 This value puts the alignment restrictions on physical address
1063 where kernel is loaded and run from. Kernel is compiled for an
1064 address which meets above alignment restriction.
1066 config TASK_SIZE_BOOL
1067 bool "Set custom user task size"
1068 depends on ADVANCED_OPTIONS
1069 help
1070 This option allows you to set the amount of virtual address space
1071 allocated to user tasks. This can be useful in optimizing the
1072 virtual memory layout of the system.
1074 Say N here unless you know what you are doing.
1076 config TASK_SIZE
1077 hex "Size of user task space" if TASK_SIZE_BOOL
1078 default "0x80000000" if PPC_8xx
1079 default "0xc0000000"
1081 config CONSISTENT_SIZE_BOOL
1082 bool "Set custom consistent memory pool size"
1083 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1084 help
1085 This option allows you to set the size of the
1086 consistent memory pool. This pool of virtual memory
1087 is used to make consistent memory allocations.
1089 config CONSISTENT_SIZE
1090 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1091 default "0x00200000" if NOT_COHERENT_CACHE
1093 config PIN_TLB
1094 bool "Pinned Kernel TLBs (860 ONLY)"
1095 depends on ADVANCED_OPTIONS && 8xx
1097 config PIN_TLB_IMMR
1098 bool "Pinned TLB for IMMR"
1099 depends on PIN_TLB
1100 default y
1101 endmenu
1103 if PPC64
1104 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1105 config PAGE_OFFSET
1106 hex
1107 default "0xc000000000000000"
1108 config KERNEL_START
1109 hex
1110 default "0xc000000000000000"
1111 config PHYSICAL_START
1112 hex
1113 default "0x00000000"
1114 endif
1116 config ARCH_RANDOM
1117 def_bool n
1119 source "net/Kconfig"
1121 source "drivers/Kconfig"
1123 source "fs/Kconfig"
1125 source "lib/Kconfig"
1127 source "arch/powerpc/Kconfig.debug"
1129 source "security/Kconfig"
1131 config KEYS_COMPAT
1132 bool
1133 depends on COMPAT && KEYS
1134 default y
1136 source "crypto/Kconfig"
1138 config PPC_LIB_RHEAP
1139 bool
1141 source "arch/powerpc/kvm/Kconfig"
1143 source "kernel/livepatch/Kconfig"