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 HAVE_RSEQ
 123         select ARCH_WANT_IPC_PARSE_VERSION
 124         select SPARSE_IRQ
 125         select IRQ_DOMAIN
 126         select GENERIC_IRQ_SHOW
 127         select GENERIC_IRQ_SHOW_LEVEL
 128         select IRQ_FORCED_THREADING
 129         select HAVE_RCU_TABLE_FREE if SMP
 130         select HAVE_SYSCALL_TRACEPOINTS
 131         select HAVE_CBPF_JIT if !PPC64
 132         select HAVE_EBPF_JIT if PPC64
 133         select HAVE_ARCH_JUMP_LABEL
 134         select ARCH_HAVE_NMI_SAFE_CMPXCHG
 135         select ARCH_HAS_GCOV_PROFILE_ALL
 136         select GENERIC_SMP_IDLE_THREAD
 137         select GENERIC_CMOS_UPDATE
 138         select GENERIC_TIME_VSYSCALL_OLD
 139         select GENERIC_CLOCKEVENTS
 140         select GENERIC_CLOCKEVENTS_BROADCAST if SMP
 141         select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
 142         select GENERIC_STRNCPY_FROM_USER
 143         select GENERIC_STRNLEN_USER
 144         select HAVE_MOD_ARCH_SPECIFIC
 145         select MODULES_USE_ELF_RELA
 146         select CLONE_BACKWARDS
 147         select ARCH_USE_BUILTIN_BSWAP
 148         select OLD_SIGSUSPEND
 149         select OLD_SIGACTION if PPC32
 150         select HAVE_DEBUG_STACKOVERFLOW
 151         select HAVE_IRQ_EXIT_ON_IRQ_STACK
 152         select ARCH_USE_CMPXCHG_LOCKREF if PPC64
 153         select HAVE_ARCH_AUDITSYSCALL
 154         select ARCH_SUPPORTS_ATOMIC_RMW
 155         select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
 156         select NO_BOOTMEM
 157         select HAVE_GENERIC_RCU_GUP
 158         select HAVE_PERF_EVENTS_NMI if PPC64
 159         select HAVE_NMI if PERF_EVENTS
 160         select EDAC_SUPPORT
 161         select EDAC_ATOMIC_SCRUB
 162         select ARCH_HAS_DMA_SET_COHERENT_MASK
 163         select ARCH_HAS_DEVMEM_IS_ALLOWED
 164         select HAVE_ARCH_SECCOMP_FILTER
 165         select ARCH_HAS_UBSAN_SANITIZE_ALL
 166         select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
 167         select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
 168         select GENERIC_CPU_AUTOPROBE
 169         select HAVE_VIRT_CPU_ACCOUNTING
 170         select HAVE_ARCH_HARDENED_USERCOPY
 171
 172 config GENERIC_CSUM
 173         def_bool CPU_LITTLE_ENDIAN
 174
 175 config EARLY_PRINTK
 176         bool
 177         default y
 178
 179 config PANIC_TIMEOUT
 180         int
 181         default 180
 182
 183 config COMPAT
 184         bool
 185         default y if PPC64
 186         select COMPAT_BINFMT_ELF
 187         select ARCH_WANT_OLD_COMPAT_IPC
 188         select COMPAT_OLD_SIGACTION
 189
 190 config SYSVIPC_COMPAT
 191         bool
 192         depends on COMPAT && SYSVIPC
 193         default y
 194
 195 # All PPC32s use generic nvram driver through ppc_md
 196 config GENERIC_NVRAM
 197         bool
 198         default y if PPC32
 199
 200 config SCHED_OMIT_FRAME_POINTER
 201         bool
 202         default y
 203
 204 config ARCH_MAY_HAVE_PC_FDC
 205         bool
 206         default PCI
 207
 208 config PPC_UDBG_16550
 209         bool
 210         default n
 211
 212 config GENERIC_TBSYNC
 213         bool
 214         default y if PPC32 && SMP
 215         default n
 216
 217 config AUDIT_ARCH
 218         bool
 219         default y
 220
 221 config GENERIC_BUG
 222         bool
 223         default y
 224         depends on BUG
 225
 226 config SYS_SUPPORTS_APM_EMULATION
 227         default y if PMAC_APM_EMU
 228         bool
 229
 230 config EPAPR_BOOT
 231         bool
 232         help
 233           Used to allow a board to specify it wants an ePAPR compliant wrapper.
 234         default n
 235
 236 config DEFAULT_UIMAGE
 237         bool
 238         help
 239           Used to allow a board to specify it wants a uImage built by default
 240         default n
 241
 242 config ARCH_HIBERNATION_POSSIBLE
 243         bool
 244         default y
 245
 246 config ARCH_SUSPEND_POSSIBLE
 247         def_bool y
 248         depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
 249                    (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
 250                    || 44x || 40x
 251
 252 config PPC_DCR_NATIVE
 253         bool
 254         default n
 255
 256 config PPC_DCR_MMIO
 257         bool
 258         default n
 259
 260 config PPC_DCR
 261         bool
 262         depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
 263         default y
 264
 265 config PPC_OF_PLATFORM_PCI
 266         bool
 267         depends on PCI
 268         depends on PPC64 # not supported on 32 bits yet
 269         default n
 270
 271 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
 272         depends on PPC32 || PPC_STD_MMU_64
 273         def_bool y
 274
 275 config ARCH_SUPPORTS_UPROBES
 276         def_bool y
 277
 278 config PPC_ADV_DEBUG_REGS
 279         bool
 280         depends on 40x || BOOKE
 281         default y
 282
 283 config PPC_ADV_DEBUG_IACS
 284         int
 285         depends on PPC_ADV_DEBUG_REGS
 286         default 4 if 44x
 287         default 2
 288
 289 config PPC_ADV_DEBUG_DACS
 290         int
 291         depends on PPC_ADV_DEBUG_REGS
 292         default 2
 293
 294 config PPC_ADV_DEBUG_DVCS
 295         int
 296         depends on PPC_ADV_DEBUG_REGS
 297         default 2 if 44x
 298         default 0
 299
 300 config PPC_ADV_DEBUG_DAC_RANGE
 301         bool
 302         depends on PPC_ADV_DEBUG_REGS && 44x
 303         default y
 304
 305 config PPC_EMULATE_SSTEP
 306         bool
 307         default y if KPROBES || UPROBES || XMON || HAVE_HW_BREAKPOINT
 308
 309 config ZONE_DMA32
 310         bool
 311         default y if PPC64
 312
 313 config PGTABLE_LEVELS
 314         int
 315         default 2 if !PPC64
 316         default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
 317         default 4
 318
 319 source "init/Kconfig"
 320
 321 source "kernel/Kconfig.freezer"
 322
 323 source "arch/powerpc/sysdev/Kconfig"
 324 source "arch/powerpc/platforms/Kconfig"
 325
 326 menu "Kernel options"
 327
 328 config HIGHMEM
 329         bool "High memory support"
 330         depends on PPC32
 331
 332 source kernel/Kconfig.hz
 333 source kernel/Kconfig.preempt
 334 source "fs/Kconfig.binfmt"
 335
 336 config HUGETLB_PAGE_SIZE_VARIABLE
 337         bool
 338         depends on HUGETLB_PAGE
 339         default y
 340
 341 config MATH_EMULATION
 342         bool "Math emulation"
 343         depends on 4xx || 8xx || PPC_MPC832x || BOOKE
 344         ---help---
 345           Some PowerPC chips designed for embedded applications do not have
 346           a floating-point unit and therefore do not implement the
 347           floating-point instructions in the PowerPC instruction set.  If you
 348           say Y here, the kernel will include code to emulate a floating-point
 349           unit, which will allow programs that use floating-point
 350           instructions to run.
 351
 352           This is also useful to emulate missing (optional) instructions
 353           such as fsqrt on cores that do have an FPU but do not implement
 354           them (such as Freescale BookE).
 355
 356 choice
 357         prompt "Math emulation options"
 358         default MATH_EMULATION_FULL
 359         depends on MATH_EMULATION
 360
 361 config  MATH_EMULATION_FULL
 362         bool "Emulate all the floating point instructions"
 363         ---help---
 364           Select this option will enable the kernel to support to emulate
 365           all the floating point instructions. If your SoC doesn't have
 366           a FPU, you should select this.
 367
 368 config MATH_EMULATION_HW_UNIMPLEMENTED
 369         bool "Just emulate the FPU unimplemented instructions"
 370         ---help---
 371           Select this if you know there does have a hardware FPU on your
 372           SoC, but some floating point instructions are not implemented by that.
 373
 374 endchoice
 375
 376 config PPC_TRANSACTIONAL_MEM
 377        bool "Transactional Memory support for POWERPC"
 378        depends on PPC_BOOK3S_64
 379        depends on SMP
 380        select ALTIVEC
 381        select VSX
 382        default n
 383        ---help---
 384          Support user-mode Transactional Memory on POWERPC.
 385
 386 config DISABLE_MPROFILE_KERNEL
 387         bool "Disable use of mprofile-kernel for kernel tracing"
 388         depends on PPC64 && CPU_LITTLE_ENDIAN
 389         default y
 390         help
 391           Selecting this options disables use of the mprofile-kernel ABI for
 392           kernel tracing. That will cause options such as live patching
 393           (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
 394           be disabled also.
 395
 396           If you have a toolchain which supports mprofile-kernel, then you can
 397           enable this. Otherwise leave it disabled. If you're not sure, say
 398           "N".
 399
 400 config MPROFILE_KERNEL
 401         depends on PPC64 && CPU_LITTLE_ENDIAN
 402         def_bool !DISABLE_MPROFILE_KERNEL
 403
 404 config IOMMU_HELPER
 405         def_bool PPC64
 406
 407 config SWIOTLB
 408         bool "SWIOTLB support"
 409         default n
 410         select IOMMU_HELPER
 411         ---help---
 412           Support for IO bounce buffering for systems without an IOMMU.
 413           This allows us to DMA to the full physical address space on
 414           platforms where the size of a physical address is larger
 415           than the bus address.  Not all platforms support this.
 416
 417 config HOTPLUG_CPU
 418         bool "Support for enabling/disabling CPUs"
 419         depends on SMP && (PPC_PSERIES || \
 420         PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
 421         ---help---
 422           Say Y here to be able to disable and re-enable individual
 423           CPUs at runtime on SMP machines.
 424
 425           Say N if you are unsure.
 426
 427 config ARCH_CPU_PROBE_RELEASE
 428         def_bool y
 429         depends on HOTPLUG_CPU
 430
 431 config ARCH_ENABLE_MEMORY_HOTPLUG
 432         def_bool y
 433
 434 config ARCH_HAS_WALK_MEMORY
 435         def_bool y
 436
 437 config ARCH_ENABLE_MEMORY_HOTREMOVE
 438         def_bool y
 439
 440 config PPC64_SUPPORTS_MEMORY_FAILURE
 441         bool "Add support for memory hwpoison"
 442         depends on PPC_BOOK3S_64
 443         default "y" if PPC_POWERNV
 444         select ARCH_SUPPORTS_MEMORY_FAILURE
 445
 446 config KEXEC
 447         bool "kexec system call"
 448         depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
 449         select KEXEC_CORE
 450         help
 451           kexec is a system call that implements the ability to shutdown your
 452           current kernel, and to start another kernel.  It is like a reboot
 453           but it is independent of the system firmware.   And like a reboot
 454           you can start any kernel with it, not just Linux.
 455
 456           The name comes from the similarity to the exec system call.
 457
 458           It is an ongoing process to be certain the hardware in a machine
 459           is properly shutdown, so do not be surprised if this code does not
 460           initially work for you.  As of this writing the exact hardware
 461           interface is strongly in flux, so no good recommendation can be
 462           made.
 463
 464 config RELOCATABLE
 465         bool "Build a relocatable kernel"
 466         depends on (PPC64 && !COMPILE_TEST) || (FLATMEM && (44x || FSL_BOOKE))
 467         select NONSTATIC_KERNEL
 468         help
 469           This builds a kernel image that is capable of running at the
 470           location the kernel is loaded at. For ppc32, there is no any
 471           alignment restrictions, and this feature is a superset of
 472           DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
 473           16k-aligned base address. The kernel is linked as a
 474           position-independent executable (PIE) and contains dynamic relocations
 475           which are processed early in the bootup process.
 476
 477           One use is for the kexec on panic case where the recovery kernel
 478           must live at a different physical address than the primary
 479           kernel.
 480
 481           Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
 482           it has been loaded at and the compile time physical addresses
 483           CONFIG_PHYSICAL_START is ignored.  However CONFIG_PHYSICAL_START
 484           setting can still be useful to bootwrappers that need to know the
 485           load address of the kernel (eg. u-boot/mkimage).
 486
 487 config CRASH_DUMP
 488         bool "Build a kdump crash kernel"
 489         depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
 490         select RELOCATABLE if (PPC64 && !COMPILE_TEST) || 44x || FSL_BOOKE
 491         help
 492           Build a kernel suitable for use as a kdump capture kernel.
 493           The same kernel binary can be used as production kernel and dump
 494           capture kernel.
 495
 496 config FA_DUMP
 497         bool "Firmware-assisted dump"
 498         depends on PPC64 && PPC_RTAS && CRASH_DUMP && KEXEC
 499         help
 500           A robust mechanism to get reliable kernel crash dump with
 501           assistance from firmware. This approach does not use kexec,
 502           instead firmware assists in booting the kdump kernel
 503           while preserving memory contents. Firmware-assisted dump
 504           is meant to be a kdump replacement offering robustness and
 505           speed not possible without system firmware assistance.
 506
 507           If unsure, say "N"
 508
 509 config IRQ_ALL_CPUS
 510         bool "Distribute interrupts on all CPUs by default"
 511         depends on SMP
 512         help
 513           This option gives the kernel permission to distribute IRQs across
 514           multiple CPUs.  Saying N here will route all IRQs to the first
 515           CPU.  Generally saying Y is safe, although some problems have been
 516           reported with SMP Power Macintoshes with this option enabled.
 517
 518 config NUMA
 519         bool "NUMA support"
 520         depends on PPC64
 521         default y if SMP && PPC_PSERIES
 522
 523 config NODES_SHIFT
 524         int
 525         default "8" if PPC64
 526         default "4"
 527         depends on NEED_MULTIPLE_NODES
 528
 529 config USE_PERCPU_NUMA_NODE_ID
 530         def_bool y
 531         depends on NUMA
 532
 533 config HAVE_MEMORYLESS_NODES
 534         def_bool y
 535         depends on NUMA
 536
 537 config ARCH_SELECT_MEMORY_MODEL
 538         def_bool y
 539         depends on PPC64
 540
 541 config ARCH_FLATMEM_ENABLE
 542         def_bool y
 543         depends on (PPC64 && !NUMA) || PPC32
 544
 545 config ARCH_SPARSEMEM_ENABLE
 546         def_bool y
 547         depends on PPC64
 548         select SPARSEMEM_VMEMMAP_ENABLE
 549
 550 config ARCH_SPARSEMEM_DEFAULT
 551         def_bool y
 552         depends on (SMP && PPC_PSERIES) || PPC_PS3
 553
 554 config SYS_SUPPORTS_HUGETLBFS
 555         bool
 556
 557 source "mm/Kconfig"
 558
 559 config ARCH_MEMORY_PROBE
 560         def_bool y
 561         depends on MEMORY_HOTPLUG
 562
 563 # Some NUMA nodes have memory ranges that span
 564 # other nodes.  Even though a pfn is valid and
 565 # between a node's start and end pfns, it may not
 566 # reside on that node.  See memmap_init_zone()
 567 # for details.
 568 config NODES_SPAN_OTHER_NODES
 569         def_bool y
 570         depends on NEED_MULTIPLE_NODES
 571
 572 config STDBINUTILS
 573         bool "Using standard binutils settings"
 574         depends on 44x
 575         default y
 576         help
 577           Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
 578           Note, that kernel will be able to run only those applications,
 579           which had been compiled using binutils later than 2.17.50.0.3 with
 580           '-zmax-page-size' set to 256K (the default is 64K). Or, if using
 581           the older binutils, you can patch them with a trivial patch, which
 582           changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
 583
 584 choice
 585         prompt "Page size"
 586         default PPC_4K_PAGES
 587         help
 588           Select the kernel logical page size. Increasing the page size
 589           will reduce software overhead at each page boundary, allow
 590           hardware prefetch mechanisms to be more effective, and allow
 591           larger dma transfers increasing IO efficiency and reducing
 592           overhead. However the utilization of memory will increase.
 593           For example, each cached file will using a multiple of the
 594           page size to hold its contents and the difference between the
 595           end of file and the end of page is wasted.
 596
 597           Some dedicated systems, such as software raid serving with
 598           accelerated calculations, have shown significant increases.
 599
 600           If you configure a 64 bit kernel for 64k pages but the
 601           processor does not support them, then the kernel will simulate
 602           them with 4k pages, loading them on demand, but with the
 603           reduced software overhead and larger internal fragmentation.
 604           For the 32 bit kernel, a large page option will not be offered
 605           unless it is supported by the configured processor.
 606
 607           If unsure, choose 4K_PAGES.
 608
 609 config PPC_4K_PAGES
 610         bool "4k page size"
 611         select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
 612
 613 config PPC_16K_PAGES
 614         bool "16k page size"
 615         depends on 44x || PPC_8xx
 616
 617 config PPC_64K_PAGES
 618         bool "64k page size"
 619         depends on !PPC_FSL_BOOK3E && (44x || PPC_STD_MMU_64 || PPC_BOOK3E_64)
 620         select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
 621
 622 config PPC_256K_PAGES
 623         bool "256k page size"
 624         depends on 44x && !STDBINUTILS
 625         help
 626           Make the page size 256k.
 627
 628           As the ELF standard only requires alignment to support page
 629           sizes up to 64k, you will need to compile all of your user
 630           space applications with a non-standard binutils settings
 631           (see the STDBINUTILS description for details).
 632
 633           Say N unless you know what you are doing.
 634
 635 endchoice
 636
 637 config FORCE_MAX_ZONEORDER
 638         int "Maximum zone order"
 639         range 8 9 if PPC64 && PPC_64K_PAGES
 640         default "9" if PPC64 && PPC_64K_PAGES
 641         range 9 13 if PPC64 && !PPC_64K_PAGES
 642         default "13" if PPC64 && !PPC_64K_PAGES
 643         range 9 64 if PPC32 && PPC_16K_PAGES
 644         default "9" if PPC32 && PPC_16K_PAGES
 645         range 7 64 if PPC32 && PPC_64K_PAGES
 646         default "7" if PPC32 && PPC_64K_PAGES
 647         range 5 64 if PPC32 && PPC_256K_PAGES
 648         default "5" if PPC32 && PPC_256K_PAGES
 649         range 11 64
 650         default "11"
 651         help
 652           The kernel memory allocator divides physically contiguous memory
 653           blocks into "zones", where each zone is a power of two number of
 654           pages.  This option selects the largest power of two that the kernel
 655           keeps in the memory allocator.  If you need to allocate very large
 656           blocks of physically contiguous memory, then you may need to
 657           increase this value.
 658
 659           This config option is actually maximum order plus one. For example,
 660           a value of 11 means that the largest free memory block is 2^10 pages.
 661
 662           The page size is not necessarily 4KB.  For example, on 64-bit
 663           systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES.  Keep
 664           this in mind when choosing a value for this option.
 665
 666 config PPC_SUBPAGE_PROT
 667         bool "Support setting protections for 4k subpages"
 668         depends on PPC_STD_MMU_64 && PPC_64K_PAGES
 669         help
 670           This option adds support for a system call to allow user programs
 671           to set access permissions (read/write, readonly, or no access)
 672           on the 4k subpages of each 64k page.
 673
 674 config PPC_COPRO_BASE
 675         bool
 676         default n
 677
 678 config SCHED_SMT
 679         bool "SMT (Hyperthreading) scheduler support"
 680         depends on PPC64 && SMP
 681         help
 682           SMT scheduler support improves the CPU scheduler's decision making
 683           when dealing with POWER5 cpus at a cost of slightly increased
 684           overhead in some places. If unsure say N here.
 685
 686 config PPC_DENORMALISATION
 687         bool "PowerPC denormalisation exception handling"
 688         depends on PPC_BOOK3S_64
 689         default "y" if PPC_POWERNV
 690         ---help---
 691           Add support for handling denormalisation of single precision
 692           values.  Useful for bare metal only.  If unsure say Y here.
 693
 694 config CMDLINE_BOOL
 695         bool "Default bootloader kernel arguments"
 696
 697 config CMDLINE
 698         string "Initial kernel command string"
 699         depends on CMDLINE_BOOL
 700         default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
 701         help
 702           On some platforms, there is currently no way for the boot loader to
 703           pass arguments to the kernel. For these platforms, you can supply
 704           some command-line options at build time by entering them here.  In
 705           most cases you will need to specify the root device here.
 706
 707 config CMDLINE_FORCE
 708         bool "Always use the default kernel command string"
 709         depends on CMDLINE_BOOL
 710         help
 711           Always use the default kernel command string, even if the boot
 712           loader passes other arguments to the kernel.
 713           This is useful if you cannot or don't want to change the
 714           command-line options your boot loader passes to the kernel.
 715
 716 config EXTRA_TARGETS
 717         string "Additional default image types"
 718         help
 719           List additional targets to be built by the bootwrapper here (separated
 720           by spaces).  This is useful for targets that depend of device tree
 721           files in the .dts directory.
 722
 723           Targets in this list will be build as part of the default build
 724           target, or when the user does a 'make zImage' or a
 725           'make zImage.initrd'.
 726
 727           If unsure, leave blank
 728
 729 config ARCH_WANTS_FREEZER_CONTROL
 730         def_bool y
 731         depends on ADB_PMU
 732
 733 source kernel/power/Kconfig
 734
 735 config SECCOMP
 736         bool "Enable seccomp to safely compute untrusted bytecode"
 737         depends on PROC_FS
 738         default y
 739         help
 740           This kernel feature is useful for number crunching applications
 741           that may need to compute untrusted bytecode during their
 742           execution. By using pipes or other transports made available to
 743           the process as file descriptors supporting the read/write
 744           syscalls, it's possible to isolate those applications in
 745           their own address space using seccomp. Once seccomp is
 746           enabled via /proc/<pid>/seccomp, it cannot be disabled
 747           and the task is only allowed to execute a few safe syscalls
 748           defined by each seccomp mode.
 749
 750           If unsure, say Y. Only embedded should say N here.
 751
 752 endmenu
 753
 754 config ISA_DMA_API
 755         bool
 756         default PCI
 757
 758 menu "Bus options"
 759
 760 config ISA
 761         bool "Support for ISA-bus hardware"
 762         depends on PPC_CHRP
 763         select PPC_I8259
 764         help
 765           Find out whether you have ISA slots on your motherboard.  ISA is the
 766           name of a bus system, i.e. the way the CPU talks to the other stuff
 767           inside your box.  If you have an Apple machine, say N here; if you
 768           have an IBM RS/6000 or pSeries machine, say Y.  If you have an
 769           embedded board, consult your board documentation.
 770
 771 config ZONE_DMA
 772         bool
 773         default y
 774
 775 config NEED_DMA_MAP_STATE
 776         def_bool (PPC64 || NOT_COHERENT_CACHE)
 777
 778 config NEED_SG_DMA_LENGTH
 779         def_bool y
 780
 781 config GENERIC_ISA_DMA
 782         bool
 783         depends on ISA_DMA_API
 784         default y
 785
 786 config PPC_INDIRECT_PCI
 787         bool
 788         depends on PCI
 789         default y if 40x || 44x
 790         default n
 791
 792 config EISA
 793         bool
 794
 795 config SBUS
 796         bool
 797
 798 config FSL_SOC
 799         bool
 800
 801 config FSL_PCI
 802         bool
 803         select PPC_INDIRECT_PCI
 804         select PCI_QUIRKS
 805
 806 config FSL_PMC
 807         bool
 808         default y
 809         depends on SUSPEND && (PPC_85xx || PPC_86xx)
 810         help
 811           Freescale MPC85xx/MPC86xx power management controller support
 812           (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
 813
 814 config PPC4xx_CPM
 815         bool
 816         default y
 817         depends on SUSPEND && (44x || 40x)
 818         help
 819           PPC4xx Clock Power Management (CPM) support (suspend/resume).
 820           It also enables support for two different idle states (idle-wait
 821           and idle-doze).
 822
 823 config 4xx_SOC
 824         bool
 825
 826 config FSL_LBC
 827         bool "Freescale Local Bus support"
 828         help
 829           Enables reporting of errors from the Freescale local bus
 830           controller.  Also contains some common code used by
 831           drivers for specific local bus peripherals.
 832
 833 config FSL_GTM
 834         bool
 835         depends on PPC_83xx || QUICC_ENGINE || CPM2
 836         help
 837           Freescale General-purpose Timers support
 838
 839 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
 840 config MCA
 841         bool
 842
 843 # Platforms that what PCI turned unconditionally just do select PCI
 844 # in their config node.  Platforms that want to choose at config
 845 # time should select PPC_PCI_CHOICE
 846 config PPC_PCI_CHOICE
 847         bool
 848
 849 config PCI
 850         bool "PCI support" if PPC_PCI_CHOICE
 851         default y if !40x && !CPM2 && !8xx && !PPC_83xx \
 852                 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
 853         default PCI_QSPAN if !4xx && !CPM2 && 8xx
 854         select GENERIC_PCI_IOMAP
 855         help
 856           Find out whether your system includes a PCI bus. PCI is the name of
 857           a bus system, i.e. the way the CPU talks to the other stuff inside
 858           your box.  If you say Y here, the kernel will include drivers and
 859           infrastructure code to support PCI bus devices.
 860
 861 config PCI_DOMAINS
 862         def_bool PCI
 863
 864 config PCI_SYSCALL
 865         def_bool PCI
 866
 867 config PCI_QSPAN
 868         bool "QSpan PCI"
 869         depends on !4xx && !CPM2 && 8xx
 870         select PPC_I8259
 871         help
 872           Say Y here if you have a system based on a Motorola 8xx-series
 873           embedded processor with a QSPAN PCI interface, otherwise say N.
 874
 875 config PCI_8260
 876         bool
 877         depends on PCI && 8260
 878         select PPC_INDIRECT_PCI
 879         default y
 880
 881 source "drivers/pci/Kconfig"
 882
 883 source "drivers/pcmcia/Kconfig"
 884
 885 config HAS_RAPIDIO
 886         bool
 887         default n
 888
 889 config RAPIDIO
 890         tristate "RapidIO support"
 891         depends on HAS_RAPIDIO || PCI
 892         help
 893           If you say Y here, the kernel will include drivers and
 894           infrastructure code to support RapidIO interconnect devices.
 895
 896 config FSL_RIO
 897         bool "Freescale Embedded SRIO Controller support"
 898         depends on RAPIDIO = y && HAS_RAPIDIO
 899         default "n"
 900         ---help---
 901           Include support for RapidIO controller on Freescale embedded
 902           processors (MPC8548, MPC8641, etc).
 903
 904 source "drivers/rapidio/Kconfig"
 905
 906 endmenu
 907
 908 config NONSTATIC_KERNEL
 909         bool
 910         default n
 911
 912 menu "Advanced setup"
 913         depends on PPC32
 914
 915 config ADVANCED_OPTIONS
 916         bool "Prompt for advanced kernel configuration options"
 917         help
 918           This option will enable prompting for a variety of advanced kernel
 919           configuration options.  These options can cause the kernel to not
 920           work if they are set incorrectly, but can be used to optimize certain
 921           aspects of kernel memory management.
 922
 923           Unless you know what you are doing, say N here.
 924
 925 comment "Default settings for advanced configuration options are used"
 926         depends on !ADVANCED_OPTIONS
 927
 928 config LOWMEM_SIZE_BOOL
 929         bool "Set maximum low memory"
 930         depends on ADVANCED_OPTIONS
 931         help
 932           This option allows you to set the maximum amount of memory which
 933           will be used as "low memory", that is, memory which the kernel can
 934           access directly, without having to set up a kernel virtual mapping.
 935           This can be useful in optimizing the layout of kernel virtual
 936           memory.
 937
 938           Say N here unless you know what you are doing.
 939
 940 config LOWMEM_SIZE
 941         hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
 942         default "0x30000000"
 943
 944 config LOWMEM_CAM_NUM_BOOL
 945         bool "Set number of CAMs to use to map low memory"
 946         depends on ADVANCED_OPTIONS && FSL_BOOKE
 947         help
 948           This option allows you to set the maximum number of CAM slots that
 949           will be used to map low memory.  There are a limited number of slots
 950           available and even more limited number that will fit in the L1 MMU.
 951           However, using more entries will allow mapping more low memory.  This
 952           can be useful in optimizing the layout of kernel virtual memory.
 953
 954           Say N here unless you know what you are doing.
 955
 956 config LOWMEM_CAM_NUM
 957         depends on FSL_BOOKE
 958         int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
 959         default 3
 960
 961 config DYNAMIC_MEMSTART
 962         bool "Enable page aligned dynamic load address for kernel"
 963         depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
 964         select NONSTATIC_KERNEL
 965         help
 966           This option enables the kernel to be loaded at any page aligned
 967           physical address. The kernel creates a mapping from KERNELBASE to
 968           the address where the kernel is loaded. The page size here implies
 969           the TLB page size of the mapping for kernel on the particular platform.
 970           Please refer to the init code for finding the TLB page size.
 971
 972           DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
 973           kernel image, where the only restriction is the page aligned kernel
 974           load address. When this option is enabled, the compile time physical
 975           address CONFIG_PHYSICAL_START is ignored.
 976
 977           This option is overridden by CONFIG_RELOCATABLE
 978
 979 config PAGE_OFFSET_BOOL
 980         bool "Set custom page offset address"
 981         depends on ADVANCED_OPTIONS
 982         help
 983           This option allows you to set the kernel virtual address at which
 984           the kernel will map low memory.  This can be useful in optimizing
 985           the virtual memory layout of the system.
 986
 987           Say N here unless you know what you are doing.
 988
 989 config PAGE_OFFSET
 990         hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
 991         default "0xc0000000"
 992
 993 config KERNEL_START_BOOL
 994         bool "Set custom kernel base address"
 995         depends on ADVANCED_OPTIONS
 996         help
 997           This option allows you to set the kernel virtual address at which
 998           the kernel will be loaded.  Normally this should match PAGE_OFFSET
 999           however there are times (like kdump) that one might not want them
1000           to be the same.
1001
1002           Say N here unless you know what you are doing.
1003
1004 config KERNEL_START
1005         hex "Virtual address of kernel base" if KERNEL_START_BOOL
1006         default PAGE_OFFSET if PAGE_OFFSET_BOOL
1007         default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1008         default "0xc0000000"
1009
1010 config PHYSICAL_START_BOOL
1011         bool "Set physical address where the kernel is loaded"
1012         depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1013         help
1014           This gives the physical address where the kernel is loaded.
1015
1016           Say N here unless you know what you are doing.
1017
1018 config PHYSICAL_START
1019         hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1020         default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1021         default "0x00000000"
1022
1023 config PHYSICAL_ALIGN
1024         hex
1025         default "0x04000000" if FSL_BOOKE
1026         help
1027           This value puts the alignment restrictions on physical address
1028           where kernel is loaded and run from. Kernel is compiled for an
1029           address which meets above alignment restriction.
1030
1031 config TASK_SIZE_BOOL
1032         bool "Set custom user task size"
1033         depends on ADVANCED_OPTIONS
1034         help
1035           This option allows you to set the amount of virtual address space
1036           allocated to user tasks.  This can be useful in optimizing the
1037           virtual memory layout of the system.
1038
1039           Say N here unless you know what you are doing.
1040
1041 config TASK_SIZE
1042         hex "Size of user task space" if TASK_SIZE_BOOL
1043         default "0x80000000" if PPC_8xx
1044         default "0xc0000000"
1045
1046 config CONSISTENT_SIZE_BOOL
1047         bool "Set custom consistent memory pool size"
1048         depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1049         help
1050           This option allows you to set the size of the
1051           consistent memory pool.  This pool of virtual memory
1052           is used to make consistent memory allocations.
1053
1054 config CONSISTENT_SIZE
1055         hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1056         default "0x00200000" if NOT_COHERENT_CACHE
1057
1058 config PIN_TLB
1059         bool "Pinned Kernel TLBs (860 ONLY)"
1060         depends on ADVANCED_OPTIONS && 8xx
1061
1062 config PIN_TLB_IMMR
1063         bool "Pinned TLB for IMMR"
1064         depends on PIN_TLB
1065         default y
1066 endmenu
1067
1068 if PPC64
1069 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1070 config PAGE_OFFSET
1071         hex
1072         default "0xc000000000000000"
1073 config KERNEL_START
1074         hex
1075         default "0xc000000000000000"
1076 config PHYSICAL_START
1077         hex
1078         default "0x00000000"
1079 endif
1080
1081 config  ARCH_RANDOM
1082         def_bool n
1083
1084 source "net/Kconfig"
1085
1086 source "drivers/Kconfig"
1087
1088 source "fs/Kconfig"
1089
1090 source "lib/Kconfig"
1091
1092 source "arch/powerpc/Kconfig.debug"
1093
1094 source "security/Kconfig"
1095
1096 config KEYS_COMPAT
1097         bool
1098         depends on COMPAT && KEYS
1099         default y
1100
1101 source "crypto/Kconfig"
1102
1103 config PPC_LIB_RHEAP
1104         bool
1105
1106 source "arch/powerpc/kvm/Kconfig"
1107
1108 source "kernel/livepatch/Kconfig"