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Linux/arch/powerpc/Kconfig

  1 source "arch/powerpc/platforms/Kconfig.cputype"
  2 
  3 config PPC32
  4         bool
  5         default y if !PPC64
  6 
  7 config 32BIT
  8         bool
  9         default y if PPC32
 10 
 11 config 64BIT
 12         bool
 13         default y if PPC64
 14 
 15 config ARCH_PHYS_ADDR_T_64BIT
 16        def_bool PPC64 || PHYS_64BIT
 17 
 18 config ARCH_DMA_ADDR_T_64BIT
 19         def_bool ARCH_PHYS_ADDR_T_64BIT
 20 
 21 config MMU
 22         bool
 23         default y
 24 
 25 config HAVE_SETUP_PER_CPU_AREA
 26         def_bool PPC64
 27 
 28 config NEED_PER_CPU_EMBED_FIRST_CHUNK
 29         def_bool PPC64
 30 
 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.
 40 
 41 config STACKTRACE_SUPPORT
 42         bool
 43         default y
 44 
 45 config TRACE_IRQFLAGS_SUPPORT
 46         bool
 47         default y
 48 
 49 config LOCKDEP_SUPPORT
 50         bool
 51         default y
 52 
 53 config RWSEM_GENERIC_SPINLOCK
 54         bool
 55 
 56 config RWSEM_XCHGADD_ALGORITHM
 57         bool
 58         default y
 59 
 60 config GENERIC_LOCKBREAK
 61         bool
 62         default y
 63         depends on SMP && PREEMPT
 64 
 65 config ARCH_HAS_ILOG2_U32
 66         bool
 67         default y
 68 
 69 config ARCH_HAS_ILOG2_U64
 70         bool
 71         default y if 64BIT
 72 
 73 config GENERIC_HWEIGHT
 74         bool
 75         default y
 76 
 77 config ARCH_HAS_DMA_SET_COHERENT_MASK
 78         bool
 79 
 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 
168 config GENERIC_CSUM
169         def_bool CPU_LITTLE_ENDIAN
170 
171 config EARLY_PRINTK
172         bool
173         default y
174 
175 config PANIC_TIMEOUT
176         int
177         default 180
178 
179 config COMPAT
180         bool
181         default y if PPC64
182         select COMPAT_BINFMT_ELF
183         select ARCH_WANT_OLD_COMPAT_IPC
184         select COMPAT_OLD_SIGACTION
185 
186 config SYSVIPC_COMPAT
187         bool
188         depends on COMPAT && SYSVIPC
189         default y
190 
191 # All PPC32s use generic nvram driver through ppc_md
192 config GENERIC_NVRAM
193         bool
194         default y if PPC32
195 
196 config SCHED_OMIT_FRAME_POINTER
197         bool
198         default y
199 
200 config ARCH_MAY_HAVE_PC_FDC
201         bool
202         default PCI
203 
204 config PPC_UDBG_16550
205         bool
206         default n
207 
208 config GENERIC_TBSYNC
209         bool
210         default y if PPC32 && SMP
211         default n
212 
213 config AUDIT_ARCH
214         bool
215         default y
216 
217 config GENERIC_BUG
218         bool
219         default y
220         depends on BUG
221 
222 config SYS_SUPPORTS_APM_EMULATION
223         default y if PMAC_APM_EMU
224         bool
225 
226 config EPAPR_BOOT
227         bool
228         help
229           Used to allow a board to specify it wants an ePAPR compliant wrapper.
230         default n
231 
232 config DEFAULT_UIMAGE
233         bool
234         help
235           Used to allow a board to specify it wants a uImage built by default
236         default n
237 
238 config ARCH_HIBERNATION_POSSIBLE
239         bool
240         default y
241 
242 config ARCH_SUSPEND_POSSIBLE
243         def_bool y
244         depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
245                    (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
246                    || 44x || 40x
247 
248 config PPC_DCR_NATIVE
249         bool
250         default n
251 
252 config PPC_DCR_MMIO
253         bool
254         default n
255 
256 config PPC_DCR
257         bool
258         depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
259         default y
260 
261 config PPC_OF_PLATFORM_PCI
262         bool
263         depends on PCI
264         depends on PPC64 # not supported on 32 bits yet
265         default n
266 
267 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
268         depends on PPC32 || PPC_STD_MMU_64
269         def_bool y
270 
271 config ARCH_SUPPORTS_UPROBES
272         def_bool y
273 
274 config PPC_ADV_DEBUG_REGS
275         bool
276         depends on 40x || BOOKE
277         default y
278 
279 config PPC_ADV_DEBUG_IACS
280         int
281         depends on PPC_ADV_DEBUG_REGS
282         default 4 if 44x
283         default 2
284 
285 config PPC_ADV_DEBUG_DACS
286         int
287         depends on PPC_ADV_DEBUG_REGS
288         default 2
289 
290 config PPC_ADV_DEBUG_DVCS
291         int
292         depends on PPC_ADV_DEBUG_REGS
293         default 2 if 44x
294         default 0
295 
296 config PPC_ADV_DEBUG_DAC_RANGE
297         bool
298         depends on PPC_ADV_DEBUG_REGS && 44x
299         default y
300 
301 config PPC_EMULATE_SSTEP
302         bool
303         default y if KPROBES || UPROBES || XMON || HAVE_HW_BREAKPOINT
304 
305 config ZONE_DMA32
306         bool
307         default y if PPC64
308 
309 config PGTABLE_LEVELS
310         int
311         default 2 if !PPC64
312         default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
313         default 4
314 
315 source "init/Kconfig"
316 
317 source "kernel/Kconfig.freezer"
318 
319 source "arch/powerpc/sysdev/Kconfig"
320 source "arch/powerpc/platforms/Kconfig"
321 
322 menu "Kernel options"
323 
324 config HIGHMEM
325         bool "High memory support"
326         depends on PPC32
327 
328 source kernel/Kconfig.hz
329 source kernel/Kconfig.preempt
330 source "fs/Kconfig.binfmt"
331 
332 config HUGETLB_PAGE_SIZE_VARIABLE
333         bool
334         depends on HUGETLB_PAGE
335         default y
336 
337 config MATH_EMULATION
338         bool "Math emulation"
339         depends on 4xx || 8xx || PPC_MPC832x || BOOKE
340         ---help---
341           Some PowerPC chips designed for embedded applications do not have
342           a floating-point unit and therefore do not implement the
343           floating-point instructions in the PowerPC instruction set.  If you
344           say Y here, the kernel will include code to emulate a floating-point
345           unit, which will allow programs that use floating-point
346           instructions to run.
347 
348           This is also useful to emulate missing (optional) instructions
349           such as fsqrt on cores that do have an FPU but do not implement
350           them (such as Freescale BookE).
351 
352 choice
353         prompt "Math emulation options"
354         default MATH_EMULATION_FULL
355         depends on MATH_EMULATION
356 
357 config  MATH_EMULATION_FULL
358         bool "Emulate all the floating point instructions"
359         ---help---
360           Select this option will enable the kernel to support to emulate
361           all the floating point instructions. If your SoC doesn't have
362           a FPU, you should select this.
363 
364 config MATH_EMULATION_HW_UNIMPLEMENTED
365         bool "Just emulate the FPU unimplemented instructions"
366         ---help---
367           Select this if you know there does have a hardware FPU on your
368           SoC, but some floating point instructions are not implemented by that.
369 
370 endchoice
371 
372 config PPC_TRANSACTIONAL_MEM
373        bool "Transactional Memory support for POWERPC"
374        depends on PPC_BOOK3S_64
375        depends on SMP
376        select ALTIVEC
377        select VSX
378        default n
379        ---help---
380          Support user-mode Transactional Memory on POWERPC.
381 
382 config DISABLE_MPROFILE_KERNEL
383         bool "Disable use of mprofile-kernel for kernel tracing"
384         depends on PPC64 && CPU_LITTLE_ENDIAN
385         default y
386         help
387           Selecting this options disables use of the mprofile-kernel ABI for
388           kernel tracing. That will cause options such as live patching
389           (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
390           be disabled also.
391 
392           If you have a toolchain which supports mprofile-kernel, then you can
393           enable this. Otherwise leave it disabled. If you're not sure, say
394           "N".
395 
396 config MPROFILE_KERNEL
397         depends on PPC64 && CPU_LITTLE_ENDIAN
398         def_bool !DISABLE_MPROFILE_KERNEL
399 
400 config USE_THIN_ARCHIVES
401         bool "Build the kernel using thin archives"
402         default n
403         select THIN_ARCHIVES
404         help
405           Build the kernel using thin archives.
406           If you're unsure say N.
407 
408 config IOMMU_HELPER
409         def_bool PPC64
410 
411 config SWIOTLB
412         bool "SWIOTLB support"
413         default n
414         select IOMMU_HELPER
415         ---help---
416           Support for IO bounce buffering for systems without an IOMMU.
417           This allows us to DMA to the full physical address space on
418           platforms where the size of a physical address is larger
419           than the bus address.  Not all platforms support this.
420 
421 config HOTPLUG_CPU
422         bool "Support for enabling/disabling CPUs"
423         depends on SMP && (PPC_PSERIES || \
424         PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
425         ---help---
426           Say Y here to be able to disable and re-enable individual
427           CPUs at runtime on SMP machines.
428 
429           Say N if you are unsure.
430 
431 config ARCH_CPU_PROBE_RELEASE
432         def_bool y
433         depends on HOTPLUG_CPU
434 
435 config ARCH_ENABLE_MEMORY_HOTPLUG
436         def_bool y
437 
438 config ARCH_HAS_WALK_MEMORY
439         def_bool y
440 
441 config ARCH_ENABLE_MEMORY_HOTREMOVE
442         def_bool y
443 
444 config PPC64_SUPPORTS_MEMORY_FAILURE
445         bool "Add support for memory hwpoison"
446         depends on PPC_BOOK3S_64
447         default "y" if PPC_POWERNV
448         select ARCH_SUPPORTS_MEMORY_FAILURE
449 
450 config KEXEC
451         bool "kexec system call"
452         depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
453         select KEXEC_CORE
454         help
455           kexec is a system call that implements the ability to shutdown your
456           current kernel, and to start another kernel.  It is like a reboot
457           but it is independent of the system firmware.   And like a reboot
458           you can start any kernel with it, not just Linux.
459 
460           The name comes from the similarity to the exec system call.
461 
462           It is an ongoing process to be certain the hardware in a machine
463           is properly shutdown, so do not be surprised if this code does not
464           initially work for you.  As of this writing the exact hardware
465           interface is strongly in flux, so no good recommendation can be
466           made.
467 
468 config KEXEC_FILE
469         bool "kexec file based system call"
470         select KEXEC_CORE
471         select HAVE_IMA_KEXEC
472         select BUILD_BIN2C
473         depends on PPC64
474         depends on CRYPTO=y
475         depends on CRYPTO_SHA256=y
476         help
477           This is a new version of the kexec system call. This call is
478           file based and takes in file descriptors as system call arguments
479           for kernel and initramfs as opposed to a list of segments as is the
480           case for the older kexec call.
481 
482 config RELOCATABLE
483         bool "Build a relocatable kernel"
484         depends on (PPC64 && !COMPILE_TEST) || (FLATMEM && (44x || FSL_BOOKE))
485         select NONSTATIC_KERNEL
486         select MODULE_REL_CRCS if MODVERSIONS
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.
495 
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.
499 
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).
505 
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.
514 
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.
523 
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.
534 
535           If unsure, say "N"
536 
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.
545 
546 config NUMA
547         bool "NUMA support"
548         depends on PPC64
549         default y if SMP && PPC_PSERIES
550 
551 config NODES_SHIFT
552         int
553         default "8" if PPC64
554         default "4"
555         depends on NEED_MULTIPLE_NODES
556 
557 config USE_PERCPU_NUMA_NODE_ID
558         def_bool y
559         depends on NUMA
560 
561 config HAVE_MEMORYLESS_NODES
562         def_bool y
563         depends on NUMA
564 
565 config ARCH_SELECT_MEMORY_MODEL
566         def_bool y
567         depends on PPC64
568 
569 config ARCH_FLATMEM_ENABLE
570         def_bool y
571         depends on (PPC64 && !NUMA) || PPC32
572 
573 config ARCH_SPARSEMEM_ENABLE
574         def_bool y
575         depends on PPC64
576         select SPARSEMEM_VMEMMAP_ENABLE
577 
578 config ARCH_SPARSEMEM_DEFAULT
579         def_bool y
580         depends on (SMP && PPC_PSERIES) || PPC_PS3
581 
582 config SYS_SUPPORTS_HUGETLBFS
583         bool
584 
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
591 
592 source "mm/Kconfig"
593 
594 config ARCH_MEMORY_PROBE
595         def_bool y
596         depends on MEMORY_HOTPLUG
597 
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
606 
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.
618 
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.
631 
632           Some dedicated systems, such as software raid serving with
633           accelerated calculations, have shown significant increases.
634 
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.
641 
642           If unsure, choose 4K_PAGES.
643 
644 config PPC_4K_PAGES
645         bool "4k page size"
646         select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
647 
648 config PPC_16K_PAGES
649         bool "16k page size"
650         depends on 44x || PPC_8xx
651 
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
656 
657 config PPC_256K_PAGES
658         bool "256k page size"
659         depends on 44x && !STDBINUTILS
660         help
661           Make the page size 256k.
662 
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).
667 
668           Say N unless you know what you are doing.
669 
670 endchoice
671 
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.
693 
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.
696 
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.
700 
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.
708 
709 config PPC_COPRO_BASE
710         bool
711         default n
712 
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.
720 
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.
728 
729 config CMDLINE_BOOL
730         bool "Default bootloader kernel arguments"
731 
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.
741 
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.
750 
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.
757 
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'.
761 
762           If unsure, leave blank
763 
764 config ARCH_WANTS_FREEZER_CONTROL
765         def_bool y
766         depends on ADB_PMU
767 
768 source kernel/power/Kconfig
769 
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.
784 
785           If unsure, say Y. Only embedded should say N here.
786 
787 endmenu
788 
789 config ISA_DMA_API
790         bool
791         default PCI
792 
793 menu "Bus options"
794 
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.
805 
806 config ZONE_DMA
807         bool
808         default y
809 
810 config NEED_DMA_MAP_STATE
811         def_bool (PPC64 || NOT_COHERENT_CACHE)
812 
813 config NEED_SG_DMA_LENGTH
814         def_bool y
815 
816 config GENERIC_ISA_DMA
817         bool
818         depends on ISA_DMA_API
819         default y
820 
821 config PPC_INDIRECT_PCI
822         bool
823         depends on PCI
824         default y if 40x || 44x
825         default n
826 
827 config EISA
828         bool
829 
830 config SBUS
831         bool
832 
833 config FSL_SOC
834         bool
835 
836 config FSL_PCI
837         bool
838         select PPC_INDIRECT_PCI
839         select PCI_QUIRKS
840 
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
848 
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).
857 
858 config 4xx_SOC
859         bool
860 
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.
867 
868 config FSL_GTM
869         bool
870         depends on PPC_83xx || QUICC_ENGINE || CPM2
871         help
872           Freescale General-purpose Timers support
873 
874 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
875 config MCA
876         bool
877 
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
883 
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.
895 
896 config PCI_DOMAINS
897         def_bool PCI
898 
899 config PCI_SYSCALL
900         def_bool PCI
901 
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.
909 
910 config PCI_8260
911         bool
912         depends on PCI && 8260
913         select PPC_INDIRECT_PCI
914         default y
915 
916 source "drivers/pci/Kconfig"
917 
918 source "drivers/pcmcia/Kconfig"
919 
920 config HAS_RAPIDIO
921         bool
922         default n
923 
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.
930 
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).
938 
939 source "drivers/rapidio/Kconfig"
940 
941 endmenu
942 
943 config NONSTATIC_KERNEL
944         bool
945         default n
946 
947 menu "Advanced setup"
948         depends on PPC32
949 
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.
957 
958           Unless you know what you are doing, say N here.
959 
960 comment "Default settings for advanced configuration options are used"
961         depends on !ADVANCED_OPTIONS
962 
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.
972 
973           Say N here unless you know what you are doing.
974 
975 config LOWMEM_SIZE
976         hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
977         default "0x30000000"
978 
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.
988 
989           Say N here unless you know what you are doing.
990 
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
995 
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.
1006 
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.
1011 
1012           This option is overridden by CONFIG_RELOCATABLE
1013 
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.
1021 
1022           Say N here unless you know what you are doing.
1023 
1024 config PAGE_OFFSET
1025         hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1026         default "0xc0000000"
1027 
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.
1036 
1037           Say N here unless you know what you are doing.
1038 
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"
1044 
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.
1050 
1051           Say N here unless you know what you are doing.
1052 
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"
1057 
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.
1065 
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.
1073 
1074           Say N here unless you know what you are doing.
1075 
1076 config TASK_SIZE
1077         hex "Size of user task space" if TASK_SIZE_BOOL
1078         default "0x80000000" if PPC_8xx
1079         default "0xc0000000"
1080 
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.
1088 
1089 config CONSISTENT_SIZE
1090         hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1091         default "0x00200000" if NOT_COHERENT_CACHE
1092 
1093 config PIN_TLB
1094         bool "Pinned Kernel TLBs (860 ONLY)"
1095         depends on ADVANCED_OPTIONS && 8xx
1096 
1097 config PIN_TLB_IMMR
1098         bool "Pinned TLB for IMMR"
1099         depends on PIN_TLB
1100         default y
1101 endmenu
1102 
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
1115 
1116 config  ARCH_RANDOM
1117         def_bool n
1118 
1119 source "net/Kconfig"
1120 
1121 source "drivers/Kconfig"
1122 
1123 source "fs/Kconfig"
1124 
1125 source "lib/Kconfig"
1126 
1127 source "arch/powerpc/Kconfig.debug"
1128 
1129 source "security/Kconfig"
1130 
1131 config KEYS_COMPAT
1132         bool
1133         depends on COMPAT && KEYS
1134         default y
1135 
1136 source "crypto/Kconfig"
1137 
1138 config PPC_LIB_RHEAP
1139         bool
1140 
1141 source "arch/powerpc/kvm/Kconfig"
1142 
1143 source "kernel/livepatch/Kconfig"

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