arch/powerpc/Kconfig

   1 # For a description of the syntax of this configuration file,
   2 # see Documentation/kbuild/kconfig-language.txt.
   3 #
   4
   5 mainmenu "Linux/PowerPC Kernel Configuration"
   6
   7 source "arch/powerpc/platforms/Kconfig.cputype"
   8
   9 config PPC32
  10         bool
  11         default y if !PPC64
  12
  13 config 64BIT
  14         bool
  15         default y if PPC64
  16
  17 config WORD_SIZE
  18         int
  19         default 64 if PPC64
  20         default 32 if !PPC64
  21
  22 config PPC_MERGE
  23         def_bool y
  24
  25 config MMU
  26         bool
  27         default y
  28
  29 config GENERIC_CMOS_UPDATE
  30         def_bool y
  31
  32 config GENERIC_TIME
  33         def_bool y
  34
  35 config GENERIC_TIME_VSYSCALL
  36         def_bool y
  37
  38 config GENERIC_CLOCKEVENTS
  39         def_bool y
  40
  41 config GENERIC_HARDIRQS
  42         bool
  43         default y
  44
  45 config HAVE_SETUP_PER_CPU_AREA
  46         def_bool PPC64
  47
  48 config IRQ_PER_CPU
  49         bool
  50         default y
  51
  52 config RWSEM_GENERIC_SPINLOCK
  53         bool
  54
  55 config RWSEM_XCHGADD_ALGORITHM
  56         bool
  57         default y
  58
  59 config GENERIC_LOCKBREAK
  60         bool
  61         default y
  62         depends on SMP && PREEMPT
  63
  64 config ARCH_HAS_ILOG2_U32
  65         bool
  66         default y
  67
  68 config ARCH_HAS_ILOG2_U64
  69         bool
  70         default y if 64BIT
  71
  72 config GENERIC_HWEIGHT
  73         bool
  74         default y
  75
  76 config GENERIC_CALIBRATE_DELAY
  77         bool
  78         default y
  79
  80 config GENERIC_FIND_NEXT_BIT
  81         bool
  82         default y
  83
  84 config ARCH_NO_VIRT_TO_BUS
  85         def_bool PPC64
  86
  87 config PPC
  88         bool
  89         default y
  90         select HAVE_OPROFILE
  91         select HAVE_KPROBES
  92
  93 config EARLY_PRINTK
  94         bool
  95         default y
  96
  97 config COMPAT
  98         bool
  99         default y if PPC64
 100         select COMPAT_BINFMT_ELF
 101
 102 config SYSVIPC_COMPAT
 103         bool
 104         depends on COMPAT && SYSVIPC
 105         default y
 106
 107 # All PPC32s use generic nvram driver through ppc_md
 108 config GENERIC_NVRAM
 109         bool
 110         default y if PPC32
 111
 112 config SCHED_NO_NO_OMIT_FRAME_POINTER
 113         bool
 114         default y
 115
 116 config ARCH_MAY_HAVE_PC_FDC
 117         bool
 118         default !PPC_PSERIES || PCI
 119
 120 config PPC_OF
 121         def_bool y
 122
 123 config OF
 124         def_bool y
 125
 126 config PPC_UDBG_16550
 127         bool
 128         default n
 129
 130 config GENERIC_TBSYNC
 131         bool
 132         default y if PPC32 && SMP
 133         default n
 134
 135 config AUDIT_ARCH
 136         bool
 137         default y
 138
 139 config GENERIC_BUG
 140         bool
 141         default y
 142         depends on BUG
 143
 144 config SYS_SUPPORTS_APM_EMULATION
 145         default y if PMAC_APM_EMU
 146         bool
 147
 148 config DEFAULT_UIMAGE
 149         bool
 150         help
 151           Used to allow a board to specify it wants a uImage built by default
 152         default n
 153
 154 config REDBOOT
 155         bool
 156
 157 config HIBERNATE_32
 158         bool
 159         depends on (PPC_PMAC && !SMP) || BROKEN
 160         default y
 161
 162 config HIBERNATE_64
 163         bool
 164         depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
 165         default y
 166
 167 config ARCH_HIBERNATION_POSSIBLE
 168         bool
 169         depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
 170         default y
 171
 172 config ARCH_SUSPEND_POSSIBLE
 173         def_bool y
 174         depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200
 175
 176 config PPC_DCR_NATIVE
 177         bool
 178         default n
 179
 180 config PPC_DCR_MMIO
 181         bool
 182         default n
 183
 184 config PPC_DCR
 185         bool
 186         depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
 187         default y
 188
 189 config PPC_OF_PLATFORM_PCI
 190         bool
 191         depends on PCI
 192         depends on PPC64 # not supported on 32 bits yet
 193         default n
 194
 195 source "init/Kconfig"
 196
 197 source "arch/powerpc/sysdev/Kconfig"
 198 source "arch/powerpc/platforms/Kconfig"
 199
 200 menu "Kernel options"
 201
 202 config HIGHMEM
 203         bool "High memory support"
 204         depends on PPC32
 205
 206 source kernel/time/Kconfig
 207 source kernel/Kconfig.hz
 208 source kernel/Kconfig.preempt
 209 source "fs/Kconfig.binfmt"
 210
 211 # We optimistically allocate largepages from the VM, so make the limit
 212 # large enough (16MB). This badly named config option is actually
 213 # max order + 1
 214 config FORCE_MAX_ZONEORDER
 215         int
 216         depends on PPC64
 217         default "9" if PPC_64K_PAGES
 218         default "13"
 219
 220 config HUGETLB_PAGE_SIZE_VARIABLE
 221         bool
 222         depends on HUGETLB_PAGE
 223         default y
 224
 225 config MATH_EMULATION
 226         bool "Math emulation"
 227         depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
 228         ---help---
 229           Some PowerPC chips designed for embedded applications do not have
 230           a floating-point unit and therefore do not implement the
 231           floating-point instructions in the PowerPC instruction set.  If you
 232           say Y here, the kernel will include code to emulate a floating-point
 233           unit, which will allow programs that use floating-point
 234           instructions to run.
 235
 236 config 8XX_MINIMAL_FPEMU
 237         bool "Minimal math emulation for 8xx"
 238         depends on 8xx && !MATH_EMULATION
 239         help
 240           Older arch/ppc kernels still emulated a few floating point
 241           instructions such as load and store, even when full math
 242           emulation is disabled.  Say "Y" here if you want to preserve
 243           this behavior.
 244
 245           It is recommended that you build a soft-float userspace instead.
 246
 247 config IOMMU_VMERGE
 248         bool "Enable IOMMU virtual merging"
 249         depends on PPC64
 250         default y
 251         help
 252           Cause IO segments sent to a device for DMA to be merged virtually
 253           by the IOMMU when they happen to have been allocated contiguously.
 254           This doesn't add pressure to the IOMMU allocator. However, some
 255           drivers don't support getting large merged segments coming back
 256           from *_map_sg().
 257
 258           Most drivers don't have this problem; it is safe to say Y here.
 259
 260 config IOMMU_HELPER
 261         def_bool PPC64
 262
 263 config HOTPLUG_CPU
 264         bool "Support for enabling/disabling CPUs"
 265         depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
 266         ---help---
 267           Say Y here to be able to disable and re-enable individual
 268           CPUs at runtime on SMP machines.
 269
 270           Say N if you are unsure.
 271
 272 config ARCH_ENABLE_MEMORY_HOTPLUG
 273         def_bool y
 274
 275 config KEXEC
 276         bool "kexec system call (EXPERIMENTAL)"
 277         depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
 278         help
 279           kexec is a system call that implements the ability to shutdown your
 280           current kernel, and to start another kernel.  It is like a reboot
 281           but it is independent of the system firmware.   And like a reboot
 282           you can start any kernel with it, not just Linux.
 283
 284           The name comes from the similarity to the exec system call.
 285
 286           It is an ongoing process to be certain the hardware in a machine
 287           is properly shutdown, so do not be surprised if this code does not
 288           initially work for you.  It may help to enable device hotplugging
 289           support.  As of this writing the exact hardware interface is
 290           strongly in flux, so no good recommendation can be made.
 291
 292 config CRASH_DUMP
 293         bool "Build a kdump crash kernel (EXPERIMENTAL)"
 294         depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
 295         help
 296           Build a kernel suitable for use as a kdump capture kernel.
 297           The kernel will be linked at a different address than normal, and
 298           so can only be used for Kdump.
 299
 300           Don't change this unless you know what you are doing.
 301
 302 config PPCBUG_NVRAM
 303         bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
 304         default y if PPC_PREP
 305
 306 config IRQ_ALL_CPUS
 307         bool "Distribute interrupts on all CPUs by default"
 308         depends on SMP && !MV64360
 309         help
 310           This option gives the kernel permission to distribute IRQs across
 311           multiple CPUs.  Saying N here will route all IRQs to the first
 312           CPU.  Generally saying Y is safe, although some problems have been
 313           reported with SMP Power Macintoshes with this option enabled.
 314
 315 config NUMA
 316         bool "NUMA support"
 317         depends on PPC64
 318         default y if SMP && PPC_PSERIES
 319
 320 config NODES_SHIFT
 321         int
 322         default "4"
 323         depends on NEED_MULTIPLE_NODES
 324
 325 config ARCH_SELECT_MEMORY_MODEL
 326         def_bool y
 327         depends on PPC64
 328
 329 config ARCH_FLATMEM_ENABLE
 330         def_bool y
 331         depends on (PPC64 && !NUMA) || PPC32
 332
 333 config ARCH_SPARSEMEM_ENABLE
 334         def_bool y
 335         depends on PPC64
 336         select SPARSEMEM_VMEMMAP_ENABLE
 337
 338 config ARCH_SPARSEMEM_DEFAULT
 339         def_bool y
 340         depends on (SMP && PPC_PSERIES) || PPC_PS3
 341
 342 config ARCH_POPULATES_NODE_MAP
 343         def_bool y
 344
 345 source "mm/Kconfig"
 346
 347 config ARCH_MEMORY_PROBE
 348         def_bool y
 349         depends on MEMORY_HOTPLUG
 350
 351 # Some NUMA nodes have memory ranges that span
 352 # other nodes.  Even though a pfn is valid and
 353 # between a node's start and end pfns, it may not
 354 # reside on that node.  See memmap_init_zone()
 355 # for details.
 356 config NODES_SPAN_OTHER_NODES
 357         def_bool y
 358         depends on NEED_MULTIPLE_NODES
 359
 360 config PPC_HAS_HASH_64K
 361         bool
 362         depends on PPC64
 363         default n
 364
 365 config PPC_64K_PAGES
 366         bool "64k page size"
 367         depends on PPC64
 368         select PPC_HAS_HASH_64K
 369         help
 370           This option changes the kernel logical page size to 64k. On machines
 371           without processor support for 64k pages, the kernel will simulate
 372           them by loading each individual 4k page on demand transparently,
 373           while on hardware with such support, it will be used to map
 374           normal application pages.
 375
 376 config PPC_SUBPAGE_PROT
 377         bool "Support setting protections for 4k subpages"
 378         depends on PPC_64K_PAGES
 379         help
 380           This option adds support for a system call to allow user programs
 381           to set access permissions (read/write, readonly, or no access)
 382           on the 4k subpages of each 64k page.
 383
 384 config SCHED_SMT
 385         bool "SMT (Hyperthreading) scheduler support"
 386         depends on PPC64 && SMP
 387         help
 388           SMT scheduler support improves the CPU scheduler's decision making
 389           when dealing with POWER5 cpus at a cost of slightly increased
 390           overhead in some places. If unsure say N here.
 391
 392 config PROC_DEVICETREE
 393         bool "Support for device tree in /proc"
 394         depends on PROC_FS
 395         help
 396           This option adds a device-tree directory under /proc which contains
 397           an image of the device tree that the kernel copies from Open
 398           Firmware or other boot firmware. If unsure, say Y here.
 399
 400 config CMDLINE_BOOL
 401         bool "Default bootloader kernel arguments"
 402
 403 config CMDLINE
 404         string "Initial kernel command string"
 405         depends on CMDLINE_BOOL
 406         default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
 407         help
 408           On some platforms, there is currently no way for the boot loader to
 409           pass arguments to the kernel. For these platforms, you can supply
 410           some command-line options at build time by entering them here.  In
 411           most cases you will need to specify the root device here.
 412
 413 if !44x || BROKEN
 414 config ARCH_WANTS_FREEZER_CONTROL
 415         def_bool y
 416         depends on ADB_PMU
 417
 418 source kernel/power/Kconfig
 419 endif
 420
 421 config SECCOMP
 422         bool "Enable seccomp to safely compute untrusted bytecode"
 423         depends on PROC_FS
 424         default y
 425         help
 426           This kernel feature is useful for number crunching applications
 427           that may need to compute untrusted bytecode during their
 428           execution. By using pipes or other transports made available to
 429           the process as file descriptors supporting the read/write
 430           syscalls, it's possible to isolate those applications in
 431           their own address space using seccomp. Once seccomp is
 432           enabled via /proc/<pid>/seccomp, it cannot be disabled
 433           and the task is only allowed to execute a few safe syscalls
 434           defined by each seccomp mode.
 435
 436           If unsure, say Y. Only embedded should say N here.
 437
 438 config WANT_DEVICE_TREE
 439         bool
 440         default n
 441
 442 endmenu
 443
 444 config ISA_DMA_API
 445         bool
 446         default !PPC_ISERIES || PCI
 447
 448 menu "Bus options"
 449
 450 config ISA
 451         bool "Support for ISA-bus hardware"
 452         depends on PPC_PREP || PPC_CHRP
 453         select PPC_I8259
 454         help
 455           Find out whether you have ISA slots on your motherboard.  ISA is the
 456           name of a bus system, i.e. the way the CPU talks to the other stuff
 457           inside your box.  If you have an Apple machine, say N here; if you
 458           have an IBM RS/6000 or pSeries machine or a PReP machine, say Y.  If
 459           you have an embedded board, consult your board documentation.
 460
 461 config ZONE_DMA
 462         bool
 463         default y
 464
 465 config GENERIC_ISA_DMA
 466         bool
 467         depends on PPC64 || POWER4 || 6xx && !CPM2
 468         default y
 469
 470 config PPC_INDIRECT_PCI
 471         bool
 472         depends on PCI
 473         default y if 40x || 44x
 474         default n
 475
 476 config EISA
 477         bool
 478
 479 config SBUS
 480         bool
 481
 482 config FSL_SOC
 483         bool
 484
 485 config FSL_PCI
 486         bool
 487         select PPC_INDIRECT_PCI
 488
 489 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
 490 config MCA
 491         bool
 492
 493 config PCI
 494         bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
 495                 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
 496                 || PPC_PS3 || 44x
 497         default y if !40x && !CPM2 && !8xx && !PPC_MPC512x && !PPC_83xx \
 498                 && !PPC_85xx && !PPC_86xx
 499         default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
 500         default PCI_QSPAN if !4xx && !CPM2 && 8xx
 501         select ARCH_SUPPORTS_MSI
 502         help
 503           Find out whether your system includes a PCI bus. PCI is the name of
 504           a bus system, i.e. the way the CPU talks to the other stuff inside
 505           your box.  If you say Y here, the kernel will include drivers and
 506           infrastructure code to support PCI bus devices.
 507
 508 config PCI_DOMAINS
 509         def_bool PCI
 510
 511 config PCI_SYSCALL
 512         def_bool PCI
 513
 514 config PCI_QSPAN
 515         bool "QSpan PCI"
 516         depends on !4xx && !CPM2 && 8xx
 517         select PPC_I8259
 518         help
 519           Say Y here if you have a system based on a Motorola 8xx-series
 520           embedded processor with a QSPAN PCI interface, otherwise say N.
 521
 522 config PCI_8260
 523         bool
 524         depends on PCI && 8260
 525         select PPC_INDIRECT_PCI
 526         default y
 527
 528 config 8260_PCI9
 529         bool "Enable workaround for MPC826x erratum PCI 9"
 530         depends on PCI_8260 && !8272
 531         default y
 532
 533 choice
 534         prompt "IDMA channel for PCI 9 workaround"
 535         depends on 8260_PCI9
 536
 537 config 8260_PCI9_IDMA1
 538         bool "IDMA1"
 539
 540 config 8260_PCI9_IDMA2
 541         bool "IDMA2"
 542
 543 config 8260_PCI9_IDMA3
 544         bool "IDMA3"
 545
 546 config 8260_PCI9_IDMA4
 547         bool "IDMA4"
 548
 549 endchoice
 550
 551 source "drivers/pci/pcie/Kconfig"
 552
 553 source "drivers/pci/Kconfig"
 554
 555 source "drivers/pcmcia/Kconfig"
 556
 557 source "drivers/pci/hotplug/Kconfig"
 558
 559 endmenu
 560
 561 menu "Advanced setup"
 562         depends on PPC32
 563
 564 config ADVANCED_OPTIONS
 565         bool "Prompt for advanced kernel configuration options"
 566         help
 567           This option will enable prompting for a variety of advanced kernel
 568           configuration options.  These options can cause the kernel to not
 569           work if they are set incorrectly, but can be used to optimize certain
 570           aspects of kernel memory management.
 571
 572           Unless you know what you are doing, say N here.
 573
 574 comment "Default settings for advanced configuration options are used"
 575         depends on !ADVANCED_OPTIONS
 576
 577 config HIGHMEM_START_BOOL
 578         bool "Set high memory pool address"
 579         depends on ADVANCED_OPTIONS && HIGHMEM
 580         help
 581           This option allows you to set the base address of the kernel virtual
 582           area used to map high memory pages.  This can be useful in
 583           optimizing the layout of kernel virtual memory.
 584
 585           Say N here unless you know what you are doing.
 586
 587 config HIGHMEM_START
 588         hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
 589         default "0xfe000000"
 590
 591 config LOWMEM_SIZE_BOOL
 592         bool "Set maximum low memory"
 593         depends on ADVANCED_OPTIONS
 594         help
 595           This option allows you to set the maximum amount of memory which
 596           will be used as "low memory", that is, memory which the kernel can
 597           access directly, without having to set up a kernel virtual mapping.
 598           This can be useful in optimizing the layout of kernel virtual
 599           memory.
 600
 601           Say N here unless you know what you are doing.
 602
 603 config LOWMEM_SIZE
 604         hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
 605         default "0x30000000"
 606
 607 config KERNEL_START_BOOL
 608         bool "Set custom kernel base address"
 609         depends on ADVANCED_OPTIONS
 610         help
 611           This option allows you to set the kernel virtual address at which
 612           the kernel will map low memory (the kernel image will be linked at
 613           this address).  This can be useful in optimizing the virtual memory
 614           layout of the system.
 615
 616           Say N here unless you know what you are doing.
 617
 618 config KERNEL_START
 619         hex "Virtual address of kernel base" if KERNEL_START_BOOL
 620         default "0xc0000000"
 621
 622 config TASK_SIZE_BOOL
 623         bool "Set custom user task size"
 624         depends on ADVANCED_OPTIONS
 625         help
 626           This option allows you to set the amount of virtual address space
 627           allocated to user tasks.  This can be useful in optimizing the
 628           virtual memory layout of the system.
 629
 630           Say N here unless you know what you are doing.
 631
 632 config TASK_SIZE
 633         hex "Size of user task space" if TASK_SIZE_BOOL
 634         default "0x80000000" if PPC_PREP || PPC_8xx
 635         default "0xc0000000"
 636
 637 config CONSISTENT_START_BOOL
 638         bool "Set custom consistent memory pool address"
 639         depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
 640         help
 641           This option allows you to set the base virtual address
 642           of the consistent memory pool.  This pool of virtual
 643           memory is used to make consistent memory allocations.
 644
 645 config CONSISTENT_START
 646         hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
 647         default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
 648         default "0xff100000" if NOT_COHERENT_CACHE
 649
 650 config CONSISTENT_SIZE_BOOL
 651         bool "Set custom consistent memory pool size"
 652         depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
 653         help
 654           This option allows you to set the size of the
 655           consistent memory pool.  This pool of virtual memory
 656           is used to make consistent memory allocations.
 657
 658 config CONSISTENT_SIZE
 659         hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
 660         default "0x00200000" if NOT_COHERENT_CACHE
 661
 662 config BOOT_LOAD_BOOL
 663         bool "Set the boot link/load address"
 664         depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
 665         help
 666           This option allows you to set the initial load address of the zImage
 667           or zImage.initrd file.  This can be useful if you are on a board
 668           which has a small amount of memory.
 669
 670           Say N here unless you know what you are doing.
 671
 672 config BOOT_LOAD
 673         hex "Link/load address for booting" if BOOT_LOAD_BOOL
 674         default "0x00400000" if 40x || 8xx || 8260
 675         default "0x01000000" if 44x
 676         default "0x00800000"
 677
 678 config PIN_TLB
 679         bool "Pinned Kernel TLBs (860 ONLY)"
 680         depends on ADVANCED_OPTIONS && 8xx
 681 endmenu
 682
 683 if PPC64
 684 config KERNEL_START
 685         hex
 686         default "0xc000000000000000"
 687 endif
 688
 689 source "net/Kconfig"
 690
 691 source "drivers/Kconfig"
 692
 693 source "fs/Kconfig"
 694
 695 # XXX source "arch/ppc/8xx_io/Kconfig"
 696
 697 # XXX source "arch/ppc/8260_io/Kconfig"
 698
 699 source "arch/powerpc/sysdev/qe_lib/Kconfig"
 700
 701 source "lib/Kconfig"
 702
 703 source "arch/powerpc/Kconfig.debug"
 704
 705 source "security/Kconfig"
 706
 707 config KEYS_COMPAT
 708         bool
 709         depends on COMPAT && KEYS
 710         default y
 711
 712 source "crypto/Kconfig"
 713
 714 config PPC_CLOCK
 715         bool
 716         default n
 717
 718 config PPC_LIB_RHEAP
 719         bool
 720