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
 101 config SYSVIPC_COMPAT
 102         bool
 103         depends on COMPAT && SYSVIPC
 104         default y
 105
 106 # All PPC32s use generic nvram driver through ppc_md
 107 config GENERIC_NVRAM
 108         bool
 109         default y if PPC32
 110
 111 config SCHED_NO_NO_OMIT_FRAME_POINTER
 112         bool
 113         default y
 114
 115 config ARCH_MAY_HAVE_PC_FDC
 116         bool
 117         default !PPC_PSERIES || PCI
 118
 119 config PPC_OF
 120         def_bool y
 121
 122 config OF
 123         def_bool y
 124
 125 config PPC_UDBG_16550
 126         bool
 127         default n
 128
 129 config GENERIC_TBSYNC
 130         bool
 131         default y if PPC32 && SMP
 132         default n
 133
 134 config AUDIT_ARCH
 135         bool
 136         default y
 137
 138 config GENERIC_BUG
 139         bool
 140         default y
 141         depends on BUG
 142
 143 config SYS_SUPPORTS_APM_EMULATION
 144         default y if PMAC_APM_EMU
 145         bool
 146
 147 config DEFAULT_UIMAGE
 148         bool
 149         help
 150           Used to allow a board to specify it wants a uImage built by default
 151         default n
 152
 153 config REDBOOT
 154         bool
 155
 156 config HIBERNATE_32
 157         bool
 158         depends on (PPC_PMAC && !SMP) || BROKEN
 159         default y
 160
 161 config HIBERNATE_64
 162         bool
 163         depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
 164         default y
 165
 166 config ARCH_HIBERNATION_POSSIBLE
 167         bool
 168         depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
 169         default y
 170
 171 config ARCH_SUSPEND_POSSIBLE
 172         def_bool y
 173         depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200
 174
 175 config PPC_DCR_NATIVE
 176         bool
 177         default n
 178
 179 config PPC_DCR_MMIO
 180         bool
 181         default n
 182
 183 config PPC_DCR
 184         bool
 185         depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
 186         default y
 187
 188 config PPC_OF_PLATFORM_PCI
 189         bool
 190         depends on PCI
 191         depends on PPC64 # not supported on 32 bits yet
 192         default n
 193
 194 source "init/Kconfig"
 195
 196 source "arch/powerpc/sysdev/Kconfig"
 197 source "arch/powerpc/platforms/Kconfig"
 198
 199 menu "Kernel options"
 200
 201 config HIGHMEM
 202         bool "High memory support"
 203         depends on PPC32
 204
 205 source kernel/time/Kconfig
 206 source kernel/Kconfig.hz
 207 source kernel/Kconfig.preempt
 208 source "fs/Kconfig.binfmt"
 209
 210 # We optimistically allocate largepages from the VM, so make the limit
 211 # large enough (16MB). This badly named config option is actually
 212 # max order + 1
 213 config FORCE_MAX_ZONEORDER
 214         int
 215         depends on PPC64
 216         default "9" if PPC_64K_PAGES
 217         default "13"
 218
 219 config HUGETLB_PAGE_SIZE_VARIABLE
 220         bool
 221         depends on HUGETLB_PAGE
 222         default y
 223
 224 config MATH_EMULATION
 225         bool "Math emulation"
 226         depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
 227         ---help---
 228           Some PowerPC chips designed for embedded applications do not have
 229           a floating-point unit and therefore do not implement the
 230           floating-point instructions in the PowerPC instruction set.  If you
 231           say Y here, the kernel will include code to emulate a floating-point
 232           unit, which will allow programs that use floating-point
 233           instructions to run.
 234
 235 config 8XX_MINIMAL_FPEMU
 236         bool "Minimal math emulation for 8xx"
 237         depends on 8xx && !MATH_EMULATION
 238         help
 239           Older arch/ppc kernels still emulated a few floating point
 240           instructions such as load and store, even when full math
 241           emulation is disabled.  Say "Y" here if you want to preserve
 242           this behavior.
 243
 244           It is recommended that you build a soft-float userspace instead.
 245
 246 config IOMMU_VMERGE
 247         bool "Enable IOMMU virtual merging"
 248         depends on PPC64
 249         default y
 250         help
 251           Cause IO segments sent to a device for DMA to be merged virtually
 252           by the IOMMU when they happen to have been allocated contiguously.
 253           This doesn't add pressure to the IOMMU allocator. However, some
 254           drivers don't support getting large merged segments coming back
 255           from *_map_sg().
 256
 257           Most drivers don't have this problem; it is safe to say Y here.
 258
 259 config HOTPLUG_CPU
 260         bool "Support for enabling/disabling CPUs"
 261         depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
 262         ---help---
 263           Say Y here to be able to disable and re-enable individual
 264           CPUs at runtime on SMP machines.
 265
 266           Say N if you are unsure.
 267
 268 config ARCH_ENABLE_MEMORY_HOTPLUG
 269         def_bool y
 270
 271 config KEXEC
 272         bool "kexec system call (EXPERIMENTAL)"
 273         depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
 274         help
 275           kexec is a system call that implements the ability to shutdown your
 276           current kernel, and to start another kernel.  It is like a reboot
 277           but it is independent of the system firmware.   And like a reboot
 278           you can start any kernel with it, not just Linux.
 279
 280           The name comes from the similarity to the exec system call.
 281
 282           It is an ongoing process to be certain the hardware in a machine
 283           is properly shutdown, so do not be surprised if this code does not
 284           initially work for you.  It may help to enable device hotplugging
 285           support.  As of this writing the exact hardware interface is
 286           strongly in flux, so no good recommendation can be made.
 287
 288 config CRASH_DUMP
 289         bool "Build a kdump crash kernel (EXPERIMENTAL)"
 290         depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
 291         help
 292           Build a kernel suitable for use as a kdump capture kernel.
 293           The kernel will be linked at a different address than normal, and
 294           so can only be used for Kdump.
 295
 296           Don't change this unless you know what you are doing.
 297
 298 config PPCBUG_NVRAM
 299         bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
 300         default y if PPC_PREP
 301
 302 config IRQ_ALL_CPUS
 303         bool "Distribute interrupts on all CPUs by default"
 304         depends on SMP && !MV64360
 305         help
 306           This option gives the kernel permission to distribute IRQs across
 307           multiple CPUs.  Saying N here will route all IRQs to the first
 308           CPU.  Generally saying Y is safe, although some problems have been
 309           reported with SMP Power Macintoshes with this option enabled.
 310
 311 config NUMA
 312         bool "NUMA support"
 313         depends on PPC64
 314         default y if SMP && PPC_PSERIES
 315
 316 config NODES_SHIFT
 317         int
 318         default "4"
 319         depends on NEED_MULTIPLE_NODES
 320
 321 config ARCH_SELECT_MEMORY_MODEL
 322         def_bool y
 323         depends on PPC64
 324
 325 config ARCH_FLATMEM_ENABLE
 326         def_bool y
 327         depends on (PPC64 && !NUMA) || PPC32
 328
 329 config ARCH_SPARSEMEM_ENABLE
 330         def_bool y
 331         depends on PPC64
 332         select SPARSEMEM_VMEMMAP_ENABLE
 333
 334 config ARCH_SPARSEMEM_DEFAULT
 335         def_bool y
 336         depends on (SMP && PPC_PSERIES) || PPC_PS3
 337
 338 config ARCH_POPULATES_NODE_MAP
 339         def_bool y
 340
 341 source "mm/Kconfig"
 342
 343 config ARCH_MEMORY_PROBE
 344         def_bool y
 345         depends on MEMORY_HOTPLUG
 346
 347 # Some NUMA nodes have memory ranges that span
 348 # other nodes.  Even though a pfn is valid and
 349 # between a node's start and end pfns, it may not
 350 # reside on that node.  See memmap_init_zone()
 351 # for details.
 352 config NODES_SPAN_OTHER_NODES
 353         def_bool y
 354         depends on NEED_MULTIPLE_NODES
 355
 356 config PPC_HAS_HASH_64K
 357         bool
 358         depends on PPC64
 359         default n
 360
 361 config PPC_64K_PAGES
 362         bool "64k page size"
 363         depends on PPC64
 364         select PPC_HAS_HASH_64K
 365         help
 366           This option changes the kernel logical page size to 64k. On machines
 367           without processor support for 64k pages, the kernel will simulate
 368           them by loading each individual 4k page on demand transparently,
 369           while on hardware with such support, it will be used to map
 370           normal application pages.
 371
 372 config PPC_SUBPAGE_PROT
 373         bool "Support setting protections for 4k subpages"
 374         depends on PPC_64K_PAGES
 375         help
 376           This option adds support for a system call to allow user programs
 377           to set access permissions (read/write, readonly, or no access)
 378           on the 4k subpages of each 64k page.
 379
 380 config SCHED_SMT
 381         bool "SMT (Hyperthreading) scheduler support"
 382         depends on PPC64 && SMP
 383         help
 384           SMT scheduler support improves the CPU scheduler's decision making
 385           when dealing with POWER5 cpus at a cost of slightly increased
 386           overhead in some places. If unsure say N here.
 387
 388 config PROC_DEVICETREE
 389         bool "Support for device tree in /proc"
 390         depends on PROC_FS
 391         help
 392           This option adds a device-tree directory under /proc which contains
 393           an image of the device tree that the kernel copies from Open
 394           Firmware or other boot firmware. If unsure, say Y here.
 395
 396 config CMDLINE_BOOL
 397         bool "Default bootloader kernel arguments"
 398
 399 config CMDLINE
 400         string "Initial kernel command string"
 401         depends on CMDLINE_BOOL
 402         default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
 403         help
 404           On some platforms, there is currently no way for the boot loader to
 405           pass arguments to the kernel. For these platforms, you can supply
 406           some command-line options at build time by entering them here.  In
 407           most cases you will need to specify the root device here.
 408
 409 if !44x || BROKEN
 410 config ARCH_WANTS_FREEZER_CONTROL
 411         def_bool y
 412         depends on ADB_PMU
 413
 414 source kernel/power/Kconfig
 415 endif
 416
 417 config SECCOMP
 418         bool "Enable seccomp to safely compute untrusted bytecode"
 419         depends on PROC_FS
 420         default y
 421         help
 422           This kernel feature is useful for number crunching applications
 423           that may need to compute untrusted bytecode during their
 424           execution. By using pipes or other transports made available to
 425           the process as file descriptors supporting the read/write
 426           syscalls, it's possible to isolate those applications in
 427           their own address space using seccomp. Once seccomp is
 428           enabled via /proc/<pid>/seccomp, it cannot be disabled
 429           and the task is only allowed to execute a few safe syscalls
 430           defined by each seccomp mode.
 431
 432           If unsure, say Y. Only embedded should say N here.
 433
 434 config WANT_DEVICE_TREE
 435         bool
 436         default n
 437
 438 config DEVICE_TREE
 439         string "Static device tree source file"
 440         depends on WANT_DEVICE_TREE
 441         help
 442           This specifies the device tree source (.dts) file to be
 443           compiled and included when building the bootwrapper.  If a
 444           relative filename is given, then it will be relative to
 445           arch/powerpc/boot/dts.  If you are not using the bootwrapper,
 446           or do not need to build a dts into the bootwrapper, this
 447           field is ignored.
 448
 449           For example, this is required when building a cuImage target
 450           for an older U-Boot, which cannot pass a device tree itself.
 451           Such a kernel will not work with a newer U-Boot that tries to
 452           pass a device tree (unless you tell it not to).  If your U-Boot
 453           does not mention a device tree in "help bootm", then use the
 454           cuImage target and specify a device tree here.  Otherwise, use
 455           the uImage target and leave this field blank.
 456
 457 endmenu
 458
 459 config ISA_DMA_API
 460         bool
 461         default !PPC_ISERIES || PCI
 462
 463 menu "Bus options"
 464
 465 config ISA
 466         bool "Support for ISA-bus hardware"
 467         depends on PPC_PREP || PPC_CHRP
 468         select PPC_I8259
 469         help
 470           Find out whether you have ISA slots on your motherboard.  ISA is the
 471           name of a bus system, i.e. the way the CPU talks to the other stuff
 472           inside your box.  If you have an Apple machine, say N here; if you
 473           have an IBM RS/6000 or pSeries machine or a PReP machine, say Y.  If
 474           you have an embedded board, consult your board documentation.
 475
 476 config ZONE_DMA
 477         bool
 478         default y
 479
 480 config GENERIC_ISA_DMA
 481         bool
 482         depends on PPC64 || POWER4 || 6xx && !CPM2
 483         default y
 484
 485 config PPC_INDIRECT_PCI
 486         bool
 487         depends on PCI
 488         default y if 40x || 44x
 489         default n
 490
 491 config EISA
 492         bool
 493
 494 config SBUS
 495         bool
 496
 497 config FSL_SOC
 498         bool
 499
 500 config FSL_PCI
 501         bool
 502         select PPC_INDIRECT_PCI
 503
 504 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
 505 config MCA
 506         bool
 507
 508 config PCI
 509         bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
 510                 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
 511                 || PPC_PS3 || 44x
 512         default y if !40x && !CPM2 && !8xx && !PPC_83xx \
 513                 && !PPC_85xx && !PPC_86xx
 514         default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
 515         default PCI_QSPAN if !4xx && !CPM2 && 8xx
 516         select ARCH_SUPPORTS_MSI
 517         help
 518           Find out whether your system includes a PCI bus. PCI is the name of
 519           a bus system, i.e. the way the CPU talks to the other stuff inside
 520           your box.  If you say Y here, the kernel will include drivers and
 521           infrastructure code to support PCI bus devices.
 522
 523 config PCI_DOMAINS
 524         def_bool PCI
 525
 526 config PCI_SYSCALL
 527         def_bool PCI
 528
 529 config PCI_QSPAN
 530         bool "QSpan PCI"
 531         depends on !4xx && !CPM2 && 8xx
 532         select PPC_I8259
 533         help
 534           Say Y here if you have a system based on a Motorola 8xx-series
 535           embedded processor with a QSPAN PCI interface, otherwise say N.
 536
 537 config PCI_8260
 538         bool
 539         depends on PCI && 8260
 540         select PPC_INDIRECT_PCI
 541         default y
 542
 543 config 8260_PCI9
 544         bool "Enable workaround for MPC826x erratum PCI 9"
 545         depends on PCI_8260 && !8272
 546         default y
 547
 548 choice
 549         prompt "IDMA channel for PCI 9 workaround"
 550         depends on 8260_PCI9
 551
 552 config 8260_PCI9_IDMA1
 553         bool "IDMA1"
 554
 555 config 8260_PCI9_IDMA2
 556         bool "IDMA2"
 557
 558 config 8260_PCI9_IDMA3
 559         bool "IDMA3"
 560
 561 config 8260_PCI9_IDMA4
 562         bool "IDMA4"
 563
 564 endchoice
 565
 566 source "drivers/pci/pcie/Kconfig"
 567
 568 source "drivers/pci/Kconfig"
 569
 570 source "drivers/pcmcia/Kconfig"
 571
 572 source "drivers/pci/hotplug/Kconfig"
 573
 574 endmenu
 575
 576 menu "Advanced setup"
 577         depends on PPC32
 578
 579 config ADVANCED_OPTIONS
 580         bool "Prompt for advanced kernel configuration options"
 581         help
 582           This option will enable prompting for a variety of advanced kernel
 583           configuration options.  These options can cause the kernel to not
 584           work if they are set incorrectly, but can be used to optimize certain
 585           aspects of kernel memory management.
 586
 587           Unless you know what you are doing, say N here.
 588
 589 comment "Default settings for advanced configuration options are used"
 590         depends on !ADVANCED_OPTIONS
 591
 592 config HIGHMEM_START_BOOL
 593         bool "Set high memory pool address"
 594         depends on ADVANCED_OPTIONS && HIGHMEM
 595         help
 596           This option allows you to set the base address of the kernel virtual
 597           area used to map high memory pages.  This can be useful in
 598           optimizing the layout of kernel virtual memory.
 599
 600           Say N here unless you know what you are doing.
 601
 602 config HIGHMEM_START
 603         hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
 604         default "0xfe000000"
 605
 606 config LOWMEM_SIZE_BOOL
 607         bool "Set maximum low memory"
 608         depends on ADVANCED_OPTIONS
 609         help
 610           This option allows you to set the maximum amount of memory which
 611           will be used as "low memory", that is, memory which the kernel can
 612           access directly, without having to set up a kernel virtual mapping.
 613           This can be useful in optimizing the layout of kernel virtual
 614           memory.
 615
 616           Say N here unless you know what you are doing.
 617
 618 config LOWMEM_SIZE
 619         hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
 620         default "0x30000000"
 621
 622 config KERNEL_START_BOOL
 623         bool "Set custom kernel base address"
 624         depends on ADVANCED_OPTIONS
 625         help
 626           This option allows you to set the kernel virtual address at which
 627           the kernel will map low memory (the kernel image will be linked at
 628           this address).  This can be useful in optimizing the virtual memory
 629           layout of the system.
 630
 631           Say N here unless you know what you are doing.
 632
 633 config KERNEL_START
 634         hex "Virtual address of kernel base" if KERNEL_START_BOOL
 635         default "0xc0000000"
 636
 637 config TASK_SIZE_BOOL
 638         bool "Set custom user task size"
 639         depends on ADVANCED_OPTIONS
 640         help
 641           This option allows you to set the amount of virtual address space
 642           allocated to user tasks.  This can be useful in optimizing the
 643           virtual memory layout of the system.
 644
 645           Say N here unless you know what you are doing.
 646
 647 config TASK_SIZE
 648         hex "Size of user task space" if TASK_SIZE_BOOL
 649         default "0x80000000" if PPC_PREP || PPC_8xx
 650         default "0xc0000000"
 651
 652 config CONSISTENT_START_BOOL
 653         bool "Set custom consistent memory pool address"
 654         depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
 655         help
 656           This option allows you to set the base virtual address
 657           of the consistent memory pool.  This pool of virtual
 658           memory is used to make consistent memory allocations.
 659
 660 config CONSISTENT_START
 661         hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
 662         default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
 663         default "0xff100000" if NOT_COHERENT_CACHE
 664
 665 config CONSISTENT_SIZE_BOOL
 666         bool "Set custom consistent memory pool size"
 667         depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
 668         help
 669           This option allows you to set the size of the
 670           consistent memory pool.  This pool of virtual memory
 671           is used to make consistent memory allocations.
 672
 673 config CONSISTENT_SIZE
 674         hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
 675         default "0x00200000" if NOT_COHERENT_CACHE
 676
 677 config BOOT_LOAD_BOOL
 678         bool "Set the boot link/load address"
 679         depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
 680         help
 681           This option allows you to set the initial load address of the zImage
 682           or zImage.initrd file.  This can be useful if you are on a board
 683           which has a small amount of memory.
 684
 685           Say N here unless you know what you are doing.
 686
 687 config BOOT_LOAD
 688         hex "Link/load address for booting" if BOOT_LOAD_BOOL
 689         default "0x00400000" if 40x || 8xx || 8260
 690         default "0x01000000" if 44x
 691         default "0x00800000"
 692
 693 config PIN_TLB
 694         bool "Pinned Kernel TLBs (860 ONLY)"
 695         depends on ADVANCED_OPTIONS && 8xx
 696 endmenu
 697
 698 if PPC64
 699 config KERNEL_START
 700         hex
 701         default "0xc000000000000000"
 702 endif
 703
 704 source "net/Kconfig"
 705
 706 source "drivers/Kconfig"
 707
 708 source "fs/Kconfig"
 709
 710 # XXX source "arch/ppc/8xx_io/Kconfig"
 711
 712 # XXX source "arch/ppc/8260_io/Kconfig"
 713
 714 source "arch/powerpc/sysdev/qe_lib/Kconfig"
 715
 716 source "lib/Kconfig"
 717
 718 source "kernel/Kconfig.instrumentation"
 719
 720 source "arch/powerpc/Kconfig.debug"
 721
 722 source "security/Kconfig"
 723
 724 config KEYS_COMPAT
 725         bool
 726         depends on COMPAT && KEYS
 727         default y
 728
 729 source "crypto/Kconfig"
 730
 731 config PPC_CLOCK
 732         bool
 733         default n
 734
 735 config PPC_LIB_RHEAP
 736         bool
 737