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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 WORD_SIZE
 16         int
 17         default 64 if PPC64
 18         default 32 if !PPC64
 19 
 20 config ARCH_PHYS_ADDR_T_64BIT
 21        def_bool PPC64 || PHYS_64BIT
 22 
 23 config ARCH_DMA_ADDR_T_64BIT
 24         def_bool ARCH_PHYS_ADDR_T_64BIT
 25 
 26 config MMU
 27         bool
 28         default y
 29 
 30 config HAVE_SETUP_PER_CPU_AREA
 31         def_bool PPC64
 32 
 33 config NEED_PER_CPU_EMBED_FIRST_CHUNK
 34         def_bool PPC64
 35 
 36 config NR_IRQS
 37         int "Number of virtual interrupt numbers"
 38         range 32 32768
 39         default "512"
 40         help
 41           This defines the number of virtual interrupt numbers the kernel
 42           can manage. Virtual interrupt numbers are what you see in
 43           /proc/interrupts. If you configure your system to have too few,
 44           drivers will fail to load or worse - handle with care.
 45 
 46 config STACKTRACE_SUPPORT
 47         bool
 48         default y
 49 
 50 config TRACE_IRQFLAGS_SUPPORT
 51         bool
 52         default y
 53 
 54 config LOCKDEP_SUPPORT
 55         bool
 56         default y
 57 
 58 config RWSEM_GENERIC_SPINLOCK
 59         bool
 60 
 61 config RWSEM_XCHGADD_ALGORITHM
 62         bool
 63         default y
 64 
 65 config GENERIC_LOCKBREAK
 66         bool
 67         default y
 68         depends on SMP && PREEMPT
 69 
 70 config ARCH_HAS_ILOG2_U32
 71         bool
 72         default y
 73 
 74 config ARCH_HAS_ILOG2_U64
 75         bool
 76         default y if 64BIT
 77 
 78 config GENERIC_HWEIGHT
 79         bool
 80         default y
 81 
 82 config ARCH_HAS_DMA_SET_COHERENT_MASK
 83         bool
 84 
 85 config PPC
 86         bool
 87         default y
 88         select ARCH_MIGHT_HAVE_PC_PARPORT
 89         select ARCH_MIGHT_HAVE_PC_SERIO
 90         select BINFMT_ELF
 91         select ARCH_HAS_ELF_RANDOMIZE
 92         select OF
 93         select OF_EARLY_FLATTREE
 94         select OF_RESERVED_MEM
 95         select HAVE_FTRACE_MCOUNT_RECORD
 96         select HAVE_DYNAMIC_FTRACE
 97         select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
 98         select HAVE_FUNCTION_TRACER
 99         select HAVE_FUNCTION_GRAPH_TRACER
100         select SYSCTL_EXCEPTION_TRACE
101         select VIRT_TO_BUS if !PPC64
102         select HAVE_IDE
103         select HAVE_IOREMAP_PROT
104         select HAVE_EFFICIENT_UNALIGNED_ACCESS if !CPU_LITTLE_ENDIAN
105         select HAVE_KPROBES
106         select HAVE_ARCH_KGDB
107         select HAVE_KRETPROBES
108         select HAVE_ARCH_TRACEHOOK
109         select HAVE_MEMBLOCK
110         select HAVE_MEMBLOCK_NODE_MAP
111         select HAVE_DMA_API_DEBUG
112         select HAVE_OPROFILE
113         select HAVE_DEBUG_KMEMLEAK
114         select ARCH_HAS_SG_CHAIN
115         select GENERIC_ATOMIC64 if PPC32
116         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
117         select HAVE_PERF_EVENTS
118         select HAVE_PERF_REGS
119         select HAVE_PERF_USER_STACK_DUMP
120         select HAVE_REGS_AND_STACK_ACCESS_API
121         select HAVE_HW_BREAKPOINT if PERF_EVENTS && PPC_BOOK3S_64
122         select ARCH_WANT_IPC_PARSE_VERSION
123         select SPARSE_IRQ
124         select IRQ_DOMAIN
125         select GENERIC_IRQ_SHOW
126         select GENERIC_IRQ_SHOW_LEVEL
127         select IRQ_FORCED_THREADING
128         select HAVE_RCU_TABLE_FREE if SMP
129         select HAVE_SYSCALL_TRACEPOINTS
130         select HAVE_CBPF_JIT if !PPC64
131         select HAVE_EBPF_JIT if PPC64
132         select HAVE_ARCH_JUMP_LABEL
133         select ARCH_HAVE_NMI_SAFE_CMPXCHG
134         select ARCH_HAS_GCOV_PROFILE_ALL
135         select GENERIC_SMP_IDLE_THREAD
136         select GENERIC_CMOS_UPDATE
137         select GENERIC_TIME_VSYSCALL_OLD
138         select GENERIC_CLOCKEVENTS
139         select GENERIC_CLOCKEVENTS_BROADCAST if SMP
140         select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
141         select GENERIC_STRNCPY_FROM_USER
142         select GENERIC_STRNLEN_USER
143         select HAVE_MOD_ARCH_SPECIFIC
144         select MODULES_USE_ELF_RELA
145         select CLONE_BACKWARDS
146         select ARCH_USE_BUILTIN_BSWAP
147         select OLD_SIGSUSPEND
148         select OLD_SIGACTION if PPC32
149         select HAVE_DEBUG_STACKOVERFLOW
150         select HAVE_IRQ_EXIT_ON_IRQ_STACK
151         select ARCH_USE_CMPXCHG_LOCKREF if PPC64
152         select HAVE_ARCH_AUDITSYSCALL
153         select ARCH_SUPPORTS_ATOMIC_RMW
154         select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
155         select NO_BOOTMEM
156         select HAVE_GENERIC_RCU_GUP
157         select HAVE_PERF_EVENTS_NMI if PPC64
158         select HAVE_NMI if PERF_EVENTS
159         select EDAC_SUPPORT
160         select EDAC_ATOMIC_SCRUB
161         select ARCH_HAS_DMA_SET_COHERENT_MASK
162         select ARCH_HAS_DEVMEM_IS_ALLOWED
163         select HAVE_ARCH_SECCOMP_FILTER
164         select ARCH_HAS_UBSAN_SANITIZE_ALL
165         select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
166         select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
167         select GENERIC_CPU_AUTOPROBE
168         select HAVE_VIRT_CPU_ACCOUNTING
169         select HAVE_ARCH_HARDENED_USERCOPY
170 
171 config GENERIC_CSUM
172         def_bool CPU_LITTLE_ENDIAN
173 
174 config EARLY_PRINTK
175         bool
176         default y
177 
178 config PANIC_TIMEOUT
179         int
180         default 180
181 
182 config COMPAT
183         bool
184         default y if PPC64
185         select COMPAT_BINFMT_ELF
186         select ARCH_WANT_OLD_COMPAT_IPC
187         select COMPAT_OLD_SIGACTION
188 
189 config SYSVIPC_COMPAT
190         bool
191         depends on COMPAT && SYSVIPC
192         default y
193 
194 # All PPC32s use generic nvram driver through ppc_md
195 config GENERIC_NVRAM
196         bool
197         default y if PPC32
198 
199 config SCHED_OMIT_FRAME_POINTER
200         bool
201         default y
202 
203 config ARCH_MAY_HAVE_PC_FDC
204         bool
205         default PCI
206 
207 config PPC_UDBG_16550
208         bool
209         default n
210 
211 config GENERIC_TBSYNC
212         bool
213         default y if PPC32 && SMP
214         default n
215 
216 config AUDIT_ARCH
217         bool
218         default y
219 
220 config GENERIC_BUG
221         bool
222         default y
223         depends on BUG
224 
225 config SYS_SUPPORTS_APM_EMULATION
226         default y if PMAC_APM_EMU
227         bool
228 
229 config EPAPR_BOOT
230         bool
231         help
232           Used to allow a board to specify it wants an ePAPR compliant wrapper.
233         default n
234 
235 config DEFAULT_UIMAGE
236         bool
237         help
238           Used to allow a board to specify it wants a uImage built by default
239         default n
240 
241 config ARCH_HIBERNATION_POSSIBLE
242         bool
243         default y
244 
245 config ARCH_SUSPEND_POSSIBLE
246         def_bool y
247         depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
248                    (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
249                    || 44x || 40x
250 
251 config PPC_DCR_NATIVE
252         bool
253         default n
254 
255 config PPC_DCR_MMIO
256         bool
257         default n
258 
259 config PPC_DCR
260         bool
261         depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
262         default y
263 
264 config PPC_OF_PLATFORM_PCI
265         bool
266         depends on PCI
267         depends on PPC64 # not supported on 32 bits yet
268         default n
269 
270 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
271         depends on PPC32 || PPC_STD_MMU_64
272         def_bool y
273 
274 config ARCH_SUPPORTS_UPROBES
275         def_bool y
276 
277 config PPC_ADV_DEBUG_REGS
278         bool
279         depends on 40x || BOOKE
280         default y
281 
282 config PPC_ADV_DEBUG_IACS
283         int
284         depends on PPC_ADV_DEBUG_REGS
285         default 4 if 44x
286         default 2
287 
288 config PPC_ADV_DEBUG_DACS
289         int
290         depends on PPC_ADV_DEBUG_REGS
291         default 2
292 
293 config PPC_ADV_DEBUG_DVCS
294         int
295         depends on PPC_ADV_DEBUG_REGS
296         default 2 if 44x
297         default 0
298 
299 config PPC_ADV_DEBUG_DAC_RANGE
300         bool
301         depends on PPC_ADV_DEBUG_REGS && 44x
302         default y
303 
304 config PPC_EMULATE_SSTEP
305         bool
306         default y if KPROBES || UPROBES || XMON || HAVE_HW_BREAKPOINT
307 
308 config ZONE_DMA32
309         bool
310         default y if PPC64
311 
312 config PGTABLE_LEVELS
313         int
314         default 2 if !PPC64
315         default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
316         default 4
317 
318 source "init/Kconfig"
319 
320 source "kernel/Kconfig.freezer"
321 
322 source "arch/powerpc/sysdev/Kconfig"
323 source "arch/powerpc/platforms/Kconfig"
324 
325 menu "Kernel options"
326 
327 config HIGHMEM
328         bool "High memory support"
329         depends on PPC32
330 
331 source kernel/Kconfig.hz
332 source kernel/Kconfig.preempt
333 source "fs/Kconfig.binfmt"
334 
335 config HUGETLB_PAGE_SIZE_VARIABLE
336         bool
337         depends on HUGETLB_PAGE
338         default y
339 
340 config MATH_EMULATION
341         bool "Math emulation"
342         depends on 4xx || 8xx || PPC_MPC832x || BOOKE
343         ---help---
344           Some PowerPC chips designed for embedded applications do not have
345           a floating-point unit and therefore do not implement the
346           floating-point instructions in the PowerPC instruction set.  If you
347           say Y here, the kernel will include code to emulate a floating-point
348           unit, which will allow programs that use floating-point
349           instructions to run.
350 
351           This is also useful to emulate missing (optional) instructions
352           such as fsqrt on cores that do have an FPU but do not implement
353           them (such as Freescale BookE).
354 
355 choice
356         prompt "Math emulation options"
357         default MATH_EMULATION_FULL
358         depends on MATH_EMULATION
359 
360 config  MATH_EMULATION_FULL
361         bool "Emulate all the floating point instructions"
362         ---help---
363           Select this option will enable the kernel to support to emulate
364           all the floating point instructions. If your SoC doesn't have
365           a FPU, you should select this.
366 
367 config MATH_EMULATION_HW_UNIMPLEMENTED
368         bool "Just emulate the FPU unimplemented instructions"
369         ---help---
370           Select this if you know there does have a hardware FPU on your
371           SoC, but some floating point instructions are not implemented by that.
372 
373 endchoice
374 
375 config PPC_TRANSACTIONAL_MEM
376        bool "Transactional Memory support for POWERPC"
377        depends on PPC_BOOK3S_64
378        depends on SMP
379        select ALTIVEC
380        select VSX
381        default n
382        ---help---
383          Support user-mode Transactional Memory on POWERPC.
384 
385 config DISABLE_MPROFILE_KERNEL
386         bool "Disable use of mprofile-kernel for kernel tracing"
387         depends on PPC64 && CPU_LITTLE_ENDIAN
388         default y
389         help
390           Selecting this options disables use of the mprofile-kernel ABI for
391           kernel tracing. That will cause options such as live patching
392           (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
393           be disabled also.
394 
395           If you have a toolchain which supports mprofile-kernel, then you can
396           enable this. Otherwise leave it disabled. If you're not sure, say
397           "N".
398 
399 config MPROFILE_KERNEL
400         depends on PPC64 && CPU_LITTLE_ENDIAN
401         def_bool !DISABLE_MPROFILE_KERNEL
402 
403 config IOMMU_HELPER
404         def_bool PPC64
405 
406 config SWIOTLB
407         bool "SWIOTLB support"
408         default n
409         select IOMMU_HELPER
410         ---help---
411           Support for IO bounce buffering for systems without an IOMMU.
412           This allows us to DMA to the full physical address space on
413           platforms where the size of a physical address is larger
414           than the bus address.  Not all platforms support this.
415 
416 config HOTPLUG_CPU
417         bool "Support for enabling/disabling CPUs"
418         depends on SMP && (PPC_PSERIES || \
419         PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
420         ---help---
421           Say Y here to be able to disable and re-enable individual
422           CPUs at runtime on SMP machines.
423 
424           Say N if you are unsure.
425 
426 config ARCH_CPU_PROBE_RELEASE
427         def_bool y
428         depends on HOTPLUG_CPU
429 
430 config ARCH_ENABLE_MEMORY_HOTPLUG
431         def_bool y
432 
433 config ARCH_HAS_WALK_MEMORY
434         def_bool y
435 
436 config ARCH_ENABLE_MEMORY_HOTREMOVE
437         def_bool y
438 
439 config PPC64_SUPPORTS_MEMORY_FAILURE
440         bool "Add support for memory hwpoison"
441         depends on PPC_BOOK3S_64
442         default "y" if PPC_POWERNV
443         select ARCH_SUPPORTS_MEMORY_FAILURE
444 
445 config KEXEC
446         bool "kexec system call"
447         depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
448         select KEXEC_CORE
449         help
450           kexec is a system call that implements the ability to shutdown your
451           current kernel, and to start another kernel.  It is like a reboot
452           but it is independent of the system firmware.   And like a reboot
453           you can start any kernel with it, not just Linux.
454 
455           The name comes from the similarity to the exec system call.
456 
457           It is an ongoing process to be certain the hardware in a machine
458           is properly shutdown, so do not be surprised if this code does not
459           initially work for you.  As of this writing the exact hardware
460           interface is strongly in flux, so no good recommendation can be
461           made.
462 
463 config RELOCATABLE
464         bool "Build a relocatable kernel"
465         depends on (PPC64 && !COMPILE_TEST) || (FLATMEM && (44x || FSL_BOOKE))
466         select NONSTATIC_KERNEL
467         help
468           This builds a kernel image that is capable of running at the
469           location the kernel is loaded at. For ppc32, there is no any
470           alignment restrictions, and this feature is a superset of
471           DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
472           16k-aligned base address. The kernel is linked as a
473           position-independent executable (PIE) and contains dynamic relocations
474           which are processed early in the bootup process.
475 
476           One use is for the kexec on panic case where the recovery kernel
477           must live at a different physical address than the primary
478           kernel.
479 
480           Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
481           it has been loaded at and the compile time physical addresses
482           CONFIG_PHYSICAL_START is ignored.  However CONFIG_PHYSICAL_START
483           setting can still be useful to bootwrappers that need to know the
484           load address of the kernel (eg. u-boot/mkimage).
485 
486 config CRASH_DUMP
487         bool "Build a kdump crash kernel"
488         depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
489         select RELOCATABLE if (PPC64 && !COMPILE_TEST) || 44x || FSL_BOOKE
490         help
491           Build a kernel suitable for use as a kdump capture kernel.
492           The same kernel binary can be used as production kernel and dump
493           capture kernel.
494 
495 config FA_DUMP
496         bool "Firmware-assisted dump"
497         depends on PPC64 && PPC_RTAS && CRASH_DUMP && KEXEC
498         help
499           A robust mechanism to get reliable kernel crash dump with
500           assistance from firmware. This approach does not use kexec,
501           instead firmware assists in booting the kdump kernel
502           while preserving memory contents. Firmware-assisted dump
503           is meant to be a kdump replacement offering robustness and
504           speed not possible without system firmware assistance.
505 
506           If unsure, say "N"
507 
508 config IRQ_ALL_CPUS
509         bool "Distribute interrupts on all CPUs by default"
510         depends on SMP
511         help
512           This option gives the kernel permission to distribute IRQs across
513           multiple CPUs.  Saying N here will route all IRQs to the first
514           CPU.  Generally saying Y is safe, although some problems have been
515           reported with SMP Power Macintoshes with this option enabled.
516 
517 config NUMA
518         bool "NUMA support"
519         depends on PPC64
520         default y if SMP && PPC_PSERIES
521 
522 config NODES_SHIFT
523         int
524         default "8" if PPC64
525         default "4"
526         depends on NEED_MULTIPLE_NODES
527 
528 config USE_PERCPU_NUMA_NODE_ID
529         def_bool y
530         depends on NUMA
531 
532 config HAVE_MEMORYLESS_NODES
533         def_bool y
534         depends on NUMA
535 
536 config ARCH_SELECT_MEMORY_MODEL
537         def_bool y
538         depends on PPC64
539 
540 config ARCH_FLATMEM_ENABLE
541         def_bool y
542         depends on (PPC64 && !NUMA) || PPC32
543 
544 config ARCH_SPARSEMEM_ENABLE
545         def_bool y
546         depends on PPC64
547         select SPARSEMEM_VMEMMAP_ENABLE
548 
549 config ARCH_SPARSEMEM_DEFAULT
550         def_bool y
551         depends on (SMP && PPC_PSERIES) || PPC_PS3
552 
553 config SYS_SUPPORTS_HUGETLBFS
554         bool
555 
556 source "mm/Kconfig"
557 
558 config ARCH_MEMORY_PROBE
559         def_bool y
560         depends on MEMORY_HOTPLUG
561 
562 # Some NUMA nodes have memory ranges that span
563 # other nodes.  Even though a pfn is valid and
564 # between a node's start and end pfns, it may not
565 # reside on that node.  See memmap_init_zone()
566 # for details.
567 config NODES_SPAN_OTHER_NODES
568         def_bool y
569         depends on NEED_MULTIPLE_NODES
570 
571 config STDBINUTILS
572         bool "Using standard binutils settings"
573         depends on 44x
574         default y
575         help
576           Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
577           Note, that kernel will be able to run only those applications,
578           which had been compiled using binutils later than 2.17.50.0.3 with
579           '-zmax-page-size' set to 256K (the default is 64K). Or, if using
580           the older binutils, you can patch them with a trivial patch, which
581           changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
582 
583 choice
584         prompt "Page size"
585         default PPC_4K_PAGES
586         help
587           Select the kernel logical page size. Increasing the page size
588           will reduce software overhead at each page boundary, allow
589           hardware prefetch mechanisms to be more effective, and allow
590           larger dma transfers increasing IO efficiency and reducing
591           overhead. However the utilization of memory will increase.
592           For example, each cached file will using a multiple of the
593           page size to hold its contents and the difference between the
594           end of file and the end of page is wasted.
595 
596           Some dedicated systems, such as software raid serving with
597           accelerated calculations, have shown significant increases.
598 
599           If you configure a 64 bit kernel for 64k pages but the
600           processor does not support them, then the kernel will simulate
601           them with 4k pages, loading them on demand, but with the
602           reduced software overhead and larger internal fragmentation.
603           For the 32 bit kernel, a large page option will not be offered
604           unless it is supported by the configured processor.
605 
606           If unsure, choose 4K_PAGES.
607 
608 config PPC_4K_PAGES
609         bool "4k page size"
610         select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
611 
612 config PPC_16K_PAGES
613         bool "16k page size"
614         depends on 44x || PPC_8xx
615 
616 config PPC_64K_PAGES
617         bool "64k page size"
618         depends on !PPC_FSL_BOOK3E && (44x || PPC_STD_MMU_64 || PPC_BOOK3E_64)
619         select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
620 
621 config PPC_256K_PAGES
622         bool "256k page size"
623         depends on 44x && !STDBINUTILS
624         help
625           Make the page size 256k.
626 
627           As the ELF standard only requires alignment to support page
628           sizes up to 64k, you will need to compile all of your user
629           space applications with a non-standard binutils settings
630           (see the STDBINUTILS description for details).
631 
632           Say N unless you know what you are doing.
633 
634 endchoice
635 
636 config FORCE_MAX_ZONEORDER
637         int "Maximum zone order"
638         range 8 9 if PPC64 && PPC_64K_PAGES
639         default "9" if PPC64 && PPC_64K_PAGES
640         range 9 13 if PPC64 && !PPC_64K_PAGES
641         default "13" if PPC64 && !PPC_64K_PAGES
642         range 9 64 if PPC32 && PPC_16K_PAGES
643         default "9" if PPC32 && PPC_16K_PAGES
644         range 7 64 if PPC32 && PPC_64K_PAGES
645         default "7" if PPC32 && PPC_64K_PAGES
646         range 5 64 if PPC32 && PPC_256K_PAGES
647         default "5" if PPC32 && PPC_256K_PAGES
648         range 11 64
649         default "11"
650         help
651           The kernel memory allocator divides physically contiguous memory
652           blocks into "zones", where each zone is a power of two number of
653           pages.  This option selects the largest power of two that the kernel
654           keeps in the memory allocator.  If you need to allocate very large
655           blocks of physically contiguous memory, then you may need to
656           increase this value.
657 
658           This config option is actually maximum order plus one. For example,
659           a value of 11 means that the largest free memory block is 2^10 pages.
660 
661           The page size is not necessarily 4KB.  For example, on 64-bit
662           systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES.  Keep
663           this in mind when choosing a value for this option.
664 
665 config PPC_SUBPAGE_PROT
666         bool "Support setting protections for 4k subpages"
667         depends on PPC_STD_MMU_64 && PPC_64K_PAGES
668         help
669           This option adds support for a system call to allow user programs
670           to set access permissions (read/write, readonly, or no access)
671           on the 4k subpages of each 64k page.
672 
673 config PPC_COPRO_BASE
674         bool
675         default n
676 
677 config SCHED_SMT
678         bool "SMT (Hyperthreading) scheduler support"
679         depends on PPC64 && SMP
680         help
681           SMT scheduler support improves the CPU scheduler's decision making
682           when dealing with POWER5 cpus at a cost of slightly increased
683           overhead in some places. If unsure say N here.
684 
685 config PPC_DENORMALISATION
686         bool "PowerPC denormalisation exception handling"
687         depends on PPC_BOOK3S_64
688         default "y" if PPC_POWERNV
689         ---help---
690           Add support for handling denormalisation of single precision
691           values.  Useful for bare metal only.  If unsure say Y here.
692 
693 config CMDLINE_BOOL
694         bool "Default bootloader kernel arguments"
695 
696 config CMDLINE
697         string "Initial kernel command string"
698         depends on CMDLINE_BOOL
699         default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
700         help
701           On some platforms, there is currently no way for the boot loader to
702           pass arguments to the kernel. For these platforms, you can supply
703           some command-line options at build time by entering them here.  In
704           most cases you will need to specify the root device here.
705 
706 config CMDLINE_FORCE
707         bool "Always use the default kernel command string"
708         depends on CMDLINE_BOOL
709         help
710           Always use the default kernel command string, even if the boot
711           loader passes other arguments to the kernel.
712           This is useful if you cannot or don't want to change the
713           command-line options your boot loader passes to the kernel.
714 
715 config EXTRA_TARGETS
716         string "Additional default image types"
717         help
718           List additional targets to be built by the bootwrapper here (separated
719           by spaces).  This is useful for targets that depend of device tree
720           files in the .dts directory.
721 
722           Targets in this list will be build as part of the default build
723           target, or when the user does a 'make zImage' or a
724           'make zImage.initrd'.
725 
726           If unsure, leave blank
727 
728 config ARCH_WANTS_FREEZER_CONTROL
729         def_bool y
730         depends on ADB_PMU
731 
732 source kernel/power/Kconfig
733 
734 config SECCOMP
735         bool "Enable seccomp to safely compute untrusted bytecode"
736         depends on PROC_FS
737         default y
738         help
739           This kernel feature is useful for number crunching applications
740           that may need to compute untrusted bytecode during their
741           execution. By using pipes or other transports made available to
742           the process as file descriptors supporting the read/write
743           syscalls, it's possible to isolate those applications in
744           their own address space using seccomp. Once seccomp is
745           enabled via /proc/<pid>/seccomp, it cannot be disabled
746           and the task is only allowed to execute a few safe syscalls
747           defined by each seccomp mode.
748 
749           If unsure, say Y. Only embedded should say N here.
750 
751 endmenu
752 
753 config ISA_DMA_API
754         bool
755         default PCI
756 
757 menu "Bus options"
758 
759 config ISA
760         bool "Support for ISA-bus hardware"
761         depends on PPC_CHRP
762         select PPC_I8259
763         help
764           Find out whether you have ISA slots on your motherboard.  ISA is the
765           name of a bus system, i.e. the way the CPU talks to the other stuff
766           inside your box.  If you have an Apple machine, say N here; if you
767           have an IBM RS/6000 or pSeries machine, say Y.  If you have an
768           embedded board, consult your board documentation.
769 
770 config ZONE_DMA
771         bool
772         default y
773 
774 config NEED_DMA_MAP_STATE
775         def_bool (PPC64 || NOT_COHERENT_CACHE)
776 
777 config NEED_SG_DMA_LENGTH
778         def_bool y
779 
780 config GENERIC_ISA_DMA
781         bool
782         depends on ISA_DMA_API
783         default y
784 
785 config PPC_INDIRECT_PCI
786         bool
787         depends on PCI
788         default y if 40x || 44x
789         default n
790 
791 config EISA
792         bool
793 
794 config SBUS
795         bool
796 
797 config FSL_SOC
798         bool
799 
800 config FSL_PCI
801         bool
802         select PPC_INDIRECT_PCI
803         select PCI_QUIRKS
804 
805 config FSL_PMC
806         bool
807         default y
808         depends on SUSPEND && (PPC_85xx || PPC_86xx)
809         help
810           Freescale MPC85xx/MPC86xx power management controller support
811           (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
812 
813 config PPC4xx_CPM
814         bool
815         default y
816         depends on SUSPEND && (44x || 40x)
817         help
818           PPC4xx Clock Power Management (CPM) support (suspend/resume).
819           It also enables support for two different idle states (idle-wait
820           and idle-doze).
821 
822 config 4xx_SOC
823         bool
824 
825 config FSL_LBC
826         bool "Freescale Local Bus support"
827         help
828           Enables reporting of errors from the Freescale local bus
829           controller.  Also contains some common code used by
830           drivers for specific local bus peripherals.
831 
832 config FSL_GTM
833         bool
834         depends on PPC_83xx || QUICC_ENGINE || CPM2
835         help
836           Freescale General-purpose Timers support
837 
838 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
839 config MCA
840         bool
841 
842 # Platforms that what PCI turned unconditionally just do select PCI
843 # in their config node.  Platforms that want to choose at config
844 # time should select PPC_PCI_CHOICE
845 config PPC_PCI_CHOICE
846         bool
847 
848 config PCI
849         bool "PCI support" if PPC_PCI_CHOICE
850         default y if !40x && !CPM2 && !8xx && !PPC_83xx \
851                 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
852         default PCI_QSPAN if !4xx && !CPM2 && 8xx
853         select GENERIC_PCI_IOMAP
854         help
855           Find out whether your system includes a PCI bus. PCI is the name of
856           a bus system, i.e. the way the CPU talks to the other stuff inside
857           your box.  If you say Y here, the kernel will include drivers and
858           infrastructure code to support PCI bus devices.
859 
860 config PCI_DOMAINS
861         def_bool PCI
862 
863 config PCI_SYSCALL
864         def_bool PCI
865 
866 config PCI_QSPAN
867         bool "QSpan PCI"
868         depends on !4xx && !CPM2 && 8xx
869         select PPC_I8259
870         help
871           Say Y here if you have a system based on a Motorola 8xx-series
872           embedded processor with a QSPAN PCI interface, otherwise say N.
873 
874 config PCI_8260
875         bool
876         depends on PCI && 8260
877         select PPC_INDIRECT_PCI
878         default y
879 
880 source "drivers/pci/Kconfig"
881 
882 source "drivers/pcmcia/Kconfig"
883 
884 config HAS_RAPIDIO
885         bool
886         default n
887 
888 config RAPIDIO
889         tristate "RapidIO support"
890         depends on HAS_RAPIDIO || PCI
891         help
892           If you say Y here, the kernel will include drivers and
893           infrastructure code to support RapidIO interconnect devices.
894 
895 config FSL_RIO
896         bool "Freescale Embedded SRIO Controller support"
897         depends on RAPIDIO = y && HAS_RAPIDIO
898         default "n"
899         ---help---
900           Include support for RapidIO controller on Freescale embedded
901           processors (MPC8548, MPC8641, etc).
902 
903 source "drivers/rapidio/Kconfig"
904 
905 endmenu
906 
907 config NONSTATIC_KERNEL
908         bool
909         default n
910 
911 menu "Advanced setup"
912         depends on PPC32
913 
914 config ADVANCED_OPTIONS
915         bool "Prompt for advanced kernel configuration options"
916         help
917           This option will enable prompting for a variety of advanced kernel
918           configuration options.  These options can cause the kernel to not
919           work if they are set incorrectly, but can be used to optimize certain
920           aspects of kernel memory management.
921 
922           Unless you know what you are doing, say N here.
923 
924 comment "Default settings for advanced configuration options are used"
925         depends on !ADVANCED_OPTIONS
926 
927 config LOWMEM_SIZE_BOOL
928         bool "Set maximum low memory"
929         depends on ADVANCED_OPTIONS
930         help
931           This option allows you to set the maximum amount of memory which
932           will be used as "low memory", that is, memory which the kernel can
933           access directly, without having to set up a kernel virtual mapping.
934           This can be useful in optimizing the layout of kernel virtual
935           memory.
936 
937           Say N here unless you know what you are doing.
938 
939 config LOWMEM_SIZE
940         hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
941         default "0x30000000"
942 
943 config LOWMEM_CAM_NUM_BOOL
944         bool "Set number of CAMs to use to map low memory"
945         depends on ADVANCED_OPTIONS && FSL_BOOKE
946         help
947           This option allows you to set the maximum number of CAM slots that
948           will be used to map low memory.  There are a limited number of slots
949           available and even more limited number that will fit in the L1 MMU.
950           However, using more entries will allow mapping more low memory.  This
951           can be useful in optimizing the layout of kernel virtual memory.
952 
953           Say N here unless you know what you are doing.
954 
955 config LOWMEM_CAM_NUM
956         depends on FSL_BOOKE
957         int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
958         default 3
959 
960 config DYNAMIC_MEMSTART
961         bool "Enable page aligned dynamic load address for kernel"
962         depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
963         select NONSTATIC_KERNEL
964         help
965           This option enables the kernel to be loaded at any page aligned
966           physical address. The kernel creates a mapping from KERNELBASE to 
967           the address where the kernel is loaded. The page size here implies
968           the TLB page size of the mapping for kernel on the particular platform.
969           Please refer to the init code for finding the TLB page size.
970 
971           DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
972           kernel image, where the only restriction is the page aligned kernel
973           load address. When this option is enabled, the compile time physical 
974           address CONFIG_PHYSICAL_START is ignored.
975 
976           This option is overridden by CONFIG_RELOCATABLE
977 
978 config PAGE_OFFSET_BOOL
979         bool "Set custom page offset address"
980         depends on ADVANCED_OPTIONS
981         help
982           This option allows you to set the kernel virtual address at which
983           the kernel will map low memory.  This can be useful in optimizing
984           the virtual memory layout of the system.
985 
986           Say N here unless you know what you are doing.
987 
988 config PAGE_OFFSET
989         hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
990         default "0xc0000000"
991 
992 config KERNEL_START_BOOL
993         bool "Set custom kernel base address"
994         depends on ADVANCED_OPTIONS
995         help
996           This option allows you to set the kernel virtual address at which
997           the kernel will be loaded.  Normally this should match PAGE_OFFSET
998           however there are times (like kdump) that one might not want them
999           to be the same.
1000 
1001           Say N here unless you know what you are doing.
1002 
1003 config KERNEL_START
1004         hex "Virtual address of kernel base" if KERNEL_START_BOOL
1005         default PAGE_OFFSET if PAGE_OFFSET_BOOL
1006         default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1007         default "0xc0000000"
1008 
1009 config PHYSICAL_START_BOOL
1010         bool "Set physical address where the kernel is loaded"
1011         depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1012         help
1013           This gives the physical address where the kernel is loaded.
1014 
1015           Say N here unless you know what you are doing.
1016 
1017 config PHYSICAL_START
1018         hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1019         default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1020         default "0x00000000"
1021 
1022 config PHYSICAL_ALIGN
1023         hex
1024         default "0x04000000" if FSL_BOOKE
1025         help
1026           This value puts the alignment restrictions on physical address
1027           where kernel is loaded and run from. Kernel is compiled for an
1028           address which meets above alignment restriction.
1029 
1030 config TASK_SIZE_BOOL
1031         bool "Set custom user task size"
1032         depends on ADVANCED_OPTIONS
1033         help
1034           This option allows you to set the amount of virtual address space
1035           allocated to user tasks.  This can be useful in optimizing the
1036           virtual memory layout of the system.
1037 
1038           Say N here unless you know what you are doing.
1039 
1040 config TASK_SIZE
1041         hex "Size of user task space" if TASK_SIZE_BOOL
1042         default "0x80000000" if PPC_8xx
1043         default "0xc0000000"
1044 
1045 config CONSISTENT_SIZE_BOOL
1046         bool "Set custom consistent memory pool size"
1047         depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1048         help
1049           This option allows you to set the size of the
1050           consistent memory pool.  This pool of virtual memory
1051           is used to make consistent memory allocations.
1052 
1053 config CONSISTENT_SIZE
1054         hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1055         default "0x00200000" if NOT_COHERENT_CACHE
1056 
1057 config PIN_TLB
1058         bool "Pinned Kernel TLBs (860 ONLY)"
1059         depends on ADVANCED_OPTIONS && 8xx
1060 
1061 config PIN_TLB_IMMR
1062         bool "Pinned TLB for IMMR"
1063         depends on PIN_TLB
1064         default y
1065 endmenu
1066 
1067 if PPC64
1068 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1069 config PAGE_OFFSET
1070         hex
1071         default "0xc000000000000000"
1072 config KERNEL_START
1073         hex
1074         default "0xc000000000000000"
1075 config PHYSICAL_START
1076         hex
1077         default "0x00000000"
1078 endif
1079 
1080 config  ARCH_RANDOM
1081         def_bool n
1082 
1083 source "net/Kconfig"
1084 
1085 source "drivers/Kconfig"
1086 
1087 source "fs/Kconfig"
1088 
1089 source "lib/Kconfig"
1090 
1091 source "arch/powerpc/Kconfig.debug"
1092 
1093 source "security/Kconfig"
1094 
1095 config KEYS_COMPAT
1096         bool
1097         depends on COMPAT && KEYS
1098         default y
1099 
1100 source "crypto/Kconfig"
1101 
1102 config PPC_LIB_RHEAP
1103         bool
1104 
1105 source "arch/powerpc/kvm/Kconfig"
1106 
1107 source "kernel/livepatch/Kconfig"

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