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"