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 IOMMU_HELPER
 260         def_bool PPC64
 261
 262 config HOTPLUG_CPU
 263         bool "Support for enabling/disabling CPUs"
 264         depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
 265         ---help---
 266           Say Y here to be able to disable and re-enable individual
 267           CPUs at runtime on SMP machines.
 268
 269           Say N if you are unsure.
 270
 271 config ARCH_ENABLE_MEMORY_HOTPLUG
 272         def_bool y
 273
 274 config KEXEC
 275         bool "kexec system call (EXPERIMENTAL)"
 276         depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
 277         help
 278           kexec is a system call that implements the ability to shutdown your
 279           current kernel, and to start another kernel.  It is like a reboot
 280           but it is independent of the system firmware.   And like a reboot
 281           you can start any kernel with it, not just Linux.
 282
 283           The name comes from the similarity to the exec system call.
 284
 285           It is an ongoing process to be certain the hardware in a machine
 286           is properly shutdown, so do not be surprised if this code does not
 287           initially work for you.  It may help to enable device hotplugging
 288           support.  As of this writing the exact hardware interface is
 289           strongly in flux, so no good recommendation can be made.
 290
 291 config CRASH_DUMP
 292         bool "Build a kdump crash kernel (EXPERIMENTAL)"
 293         depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
 294         help
 295           Build a kernel suitable for use as a kdump capture kernel.
 296           The kernel will be linked at a different address than normal, and
 297           so can only be used for Kdump.
 298
 299           Don't change this unless you know what you are doing.
 300
 301 config PPCBUG_NVRAM
 302         bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
 303         default y if PPC_PREP
 304
 305 config IRQ_ALL_CPUS
 306         bool "Distribute interrupts on all CPUs by default"
 307         depends on SMP && !MV64360
 308         help
 309           This option gives the kernel permission to distribute IRQs across
 310           multiple CPUs.  Saying N here will route all IRQs to the first
 311           CPU.  Generally saying Y is safe, although some problems have been
 312           reported with SMP Power Macintoshes with this option enabled.
 313
 314 config NUMA
 315         bool "NUMA support"
 316         depends on PPC64
 317         default y if SMP && PPC_PSERIES
 318
 319 config NODES_SHIFT
 320         int
 321         default "4"
 322         depends on NEED_MULTIPLE_NODES
 323
 324 config ARCH_SELECT_MEMORY_MODEL
 325         def_bool y
 326         depends on PPC64
 327
 328 config ARCH_FLATMEM_ENABLE
 329         def_bool y
 330         depends on (PPC64 && !NUMA) || PPC32
 331
 332 config ARCH_SPARSEMEM_ENABLE
 333         def_bool y
 334         depends on PPC64
 335         select SPARSEMEM_VMEMMAP_ENABLE
 336
 337 config ARCH_SPARSEMEM_DEFAULT
 338         def_bool y
 339         depends on (SMP && PPC_PSERIES) || PPC_PS3
 340
 341 config ARCH_POPULATES_NODE_MAP
 342         def_bool y
 343
 344 source "mm/Kconfig"
 345
 346 config ARCH_MEMORY_PROBE
 347         def_bool y
 348         depends on MEMORY_HOTPLUG
 349
 350 # Some NUMA nodes have memory ranges that span
 351 # other nodes.  Even though a pfn is valid and
 352 # between a node's start and end pfns, it may not
 353 # reside on that node.  See memmap_init_zone()
 354 # for details.
 355 config NODES_SPAN_OTHER_NODES
 356         def_bool y
 357         depends on NEED_MULTIPLE_NODES
 358
 359 config PPC_HAS_HASH_64K
 360         bool
 361         depends on PPC64
 362         default n
 363
 364 config PPC_64K_PAGES
 365         bool "64k page size"
 366         depends on PPC64
 367         select PPC_HAS_HASH_64K
 368         help
 369           This option changes the kernel logical page size to 64k. On machines
 370           without processor support for 64k pages, the kernel will simulate
 371           them by loading each individual 4k page on demand transparently,
 372           while on hardware with such support, it will be used to map
 373           normal application pages.
 374
 375 config PPC_SUBPAGE_PROT
 376         bool "Support setting protections for 4k subpages"
 377         depends on PPC_64K_PAGES
 378         help
 379           This option adds support for a system call to allow user programs
 380           to set access permissions (read/write, readonly, or no access)
 381           on the 4k subpages of each 64k page.
 382
 383 config SCHED_SMT
 384         bool "SMT (Hyperthreading) scheduler support"
 385         depends on PPC64 && SMP
 386         help
 387           SMT scheduler support improves the CPU scheduler's decision making
 388           when dealing with POWER5 cpus at a cost of slightly increased
 389           overhead in some places. If unsure say N here.
 390
 391 config PROC_DEVICETREE
 392         bool "Support for device tree in /proc"
 393         depends on PROC_FS
 394         help
 395           This option adds a device-tree directory under /proc which contains
 396           an image of the device tree that the kernel copies from Open
 397           Firmware or other boot firmware. If unsure, say Y here.
 398
 399 config CMDLINE_BOOL
 400         bool "Default bootloader kernel arguments"
 401
 402 config CMDLINE
 403         string "Initial kernel command string"
 404         depends on CMDLINE_BOOL
 405         default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
 406         help
 407           On some platforms, there is currently no way for the boot loader to
 408           pass arguments to the kernel. For these platforms, you can supply
 409           some command-line options at build time by entering them here.  In
 410           most cases you will need to specify the root device here.
 411
 412 if !44x || BROKEN
 413 config ARCH_WANTS_FREEZER_CONTROL
 414         def_bool y
 415         depends on ADB_PMU
 416
 417 source kernel/power/Kconfig
 418 endif
 419
 420 config SECCOMP
 421         bool "Enable seccomp to safely compute untrusted bytecode"
 422         depends on PROC_FS
 423         default y
 424         help
 425           This kernel feature is useful for number crunching applications
 426           that may need to compute untrusted bytecode during their
 427           execution. By using pipes or other transports made available to
 428           the process as file descriptors supporting the read/write
 429           syscalls, it's possible to isolate those applications in
 430           their own address space using seccomp. Once seccomp is
 431           enabled via /proc/<pid>/seccomp, it cannot be disabled
 432           and the task is only allowed to execute a few safe syscalls
 433           defined by each seccomp mode.
 434
 435           If unsure, say Y. Only embedded should say N here.
 436
 437 config WANT_DEVICE_TREE
 438         bool
 439         default n
 440
 441 config DEVICE_TREE
 442         string "Static device tree source file"
 443         depends on WANT_DEVICE_TREE
 444         help
 445           This specifies the device tree source (.dts) file to be
 446           compiled and included when building the bootwrapper.  If a
 447           relative filename is given, then it will be relative to
 448           arch/powerpc/boot/dts.  If you are not using the bootwrapper,
 449           or do not need to build a dts into the bootwrapper, this
 450           field is ignored.
 451
 452           For example, this is required when building a cuImage target
 453           for an older U-Boot, which cannot pass a device tree itself.
 454           Such a kernel will not work with a newer U-Boot that tries to
 455           pass a device tree (unless you tell it not to).  If your U-Boot
 456           does not mention a device tree in "help bootm", then use the
 457           cuImage target and specify a device tree here.  Otherwise, use
 458           the uImage target and leave this field blank.
 459
 460 endmenu
 461
 462 config ISA_DMA_API
 463         bool
 464         default !PPC_ISERIES || PCI
 465
 466 menu "Bus options"
 467
 468 config ISA
 469         bool "Support for ISA-bus hardware"
 470         depends on PPC_PREP || PPC_CHRP
 471         select PPC_I8259
 472         help
 473           Find out whether you have ISA slots on your motherboard.  ISA is the
 474           name of a bus system, i.e. the way the CPU talks to the other stuff
 475           inside your box.  If you have an Apple machine, say N here; if you
 476           have an IBM RS/6000 or pSeries machine or a PReP machine, say Y.  If
 477           you have an embedded board, consult your board documentation.
 478
 479 config ZONE_DMA
 480         bool
 481         default y
 482
 483 config GENERIC_ISA_DMA
 484         bool
 485         depends on PPC64 || POWER4 || 6xx && !CPM2
 486         default y
 487
 488 config PPC_INDIRECT_PCI
 489         bool
 490         depends on PCI
 491         default y if 40x || 44x
 492         default n
 493
 494 config EISA
 495         bool
 496
 497 config SBUS
 498         bool
 499
 500 config FSL_SOC
 501         bool
 502
 503 config FSL_PCI
 504         bool
 505         select PPC_INDIRECT_PCI
 506
 507 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
 508 config MCA
 509         bool
 510
 511 config PCI
 512         bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
 513                 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
 514                 || PPC_PS3 || 44x
 515         default y if !40x && !CPM2 && !8xx && !PPC_83xx \
 516                 && !PPC_85xx && !PPC_86xx
 517         default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
 518         default PCI_QSPAN if !4xx && !CPM2 && 8xx
 519         select ARCH_SUPPORTS_MSI
 520         help
 521           Find out whether your system includes a PCI bus. PCI is the name of
 522           a bus system, i.e. the way the CPU talks to the other stuff inside
 523           your box.  If you say Y here, the kernel will include drivers and
 524           infrastructure code to support PCI bus devices.
 525
 526 config PCI_DOMAINS
 527         def_bool PCI
 528
 529 config PCI_SYSCALL
 530         def_bool PCI
 531
 532 config PCI_QSPAN
 533         bool "QSpan PCI"
 534         depends on !4xx && !CPM2 && 8xx
 535         select PPC_I8259
 536         help
 537           Say Y here if you have a system based on a Motorola 8xx-series
 538           embedded processor with a QSPAN PCI interface, otherwise say N.
 539
 540 config PCI_8260
 541         bool
 542         depends on PCI && 8260
 543         select PPC_INDIRECT_PCI
 544         default y
 545
 546 config 8260_PCI9
 547         bool "Enable workaround for MPC826x erratum PCI 9"
 548         depends on PCI_8260 && !8272
 549         default y
 550
 551 choice
 552         prompt "IDMA channel for PCI 9 workaround"
 553         depends on 8260_PCI9
 554
 555 config 8260_PCI9_IDMA1
 556         bool "IDMA1"
 557
 558 config 8260_PCI9_IDMA2
 559         bool "IDMA2"
 560
 561 config 8260_PCI9_IDMA3
 562         bool "IDMA3"
 563
 564 config 8260_PCI9_IDMA4
 565         bool "IDMA4"
 566
 567 endchoice
 568
 569 source "drivers/pci/pcie/Kconfig"
 570
 571 source "drivers/pci/Kconfig"
 572
 573 source "drivers/pcmcia/Kconfig"
 574
 575 source "drivers/pci/hotplug/Kconfig"
 576
 577 endmenu
 578
 579 menu "Advanced setup"
 580         depends on PPC32
 581
 582 config ADVANCED_OPTIONS
 583         bool "Prompt for advanced kernel configuration options"
 584         help
 585           This option will enable prompting for a variety of advanced kernel
 586           configuration options.  These options can cause the kernel to not
 587           work if they are set incorrectly, but can be used to optimize certain
 588           aspects of kernel memory management.
 589
 590           Unless you know what you are doing, say N here.
 591
 592 comment "Default settings for advanced configuration options are used"
 593         depends on !ADVANCED_OPTIONS
 594
 595 config HIGHMEM_START_BOOL
 596         bool "Set high memory pool address"
 597         depends on ADVANCED_OPTIONS && HIGHMEM
 598         help
 599           This option allows you to set the base address of the kernel virtual
 600           area used to map high memory pages.  This can be useful in
 601           optimizing the layout of kernel virtual memory.
 602
 603           Say N here unless you know what you are doing.
 604
 605 config HIGHMEM_START
 606         hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
 607         default "0xfe000000"
 608
 609 config LOWMEM_SIZE_BOOL
 610         bool "Set maximum low memory"
 611         depends on ADVANCED_OPTIONS
 612         help
 613           This option allows you to set the maximum amount of memory which
 614           will be used as "low memory", that is, memory which the kernel can
 615           access directly, without having to set up a kernel virtual mapping.
 616           This can be useful in optimizing the layout of kernel virtual
 617           memory.
 618
 619           Say N here unless you know what you are doing.
 620
 621 config LOWMEM_SIZE
 622         hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
 623         default "0x30000000"
 624
 625 config KERNEL_START_BOOL
 626         bool "Set custom kernel base address"
 627         depends on ADVANCED_OPTIONS
 628         help
 629           This option allows you to set the kernel virtual address at which
 630           the kernel will map low memory (the kernel image will be linked at
 631           this address).  This can be useful in optimizing the virtual memory
 632           layout of the system.
 633
 634           Say N here unless you know what you are doing.
 635
 636 config KERNEL_START
 637         hex "Virtual address of kernel base" if KERNEL_START_BOOL
 638         default "0xc0000000"
 639
 640 config TASK_SIZE_BOOL
 641         bool "Set custom user task size"
 642         depends on ADVANCED_OPTIONS
 643         help
 644           This option allows you to set the amount of virtual address space
 645           allocated to user tasks.  This can be useful in optimizing the
 646           virtual memory layout of the system.
 647
 648           Say N here unless you know what you are doing.
 649
 650 config TASK_SIZE
 651         hex "Size of user task space" if TASK_SIZE_BOOL
 652         default "0x80000000" if PPC_PREP || PPC_8xx
 653         default "0xc0000000"
 654
 655 config CONSISTENT_START_BOOL
 656         bool "Set custom consistent memory pool address"
 657         depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
 658         help
 659           This option allows you to set the base virtual address
 660           of the consistent memory pool.  This pool of virtual
 661           memory is used to make consistent memory allocations.
 662
 663 config CONSISTENT_START
 664         hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
 665         default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
 666         default "0xff100000" if NOT_COHERENT_CACHE
 667
 668 config CONSISTENT_SIZE_BOOL
 669         bool "Set custom consistent memory pool size"
 670         depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
 671         help
 672           This option allows you to set the size of the
 673           consistent memory pool.  This pool of virtual memory
 674           is used to make consistent memory allocations.
 675
 676 config CONSISTENT_SIZE
 677         hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
 678         default "0x00200000" if NOT_COHERENT_CACHE
 679
 680 config BOOT_LOAD_BOOL
 681         bool "Set the boot link/load address"
 682         depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
 683         help
 684           This option allows you to set the initial load address of the zImage
 685           or zImage.initrd file.  This can be useful if you are on a board
 686           which has a small amount of memory.
 687
 688           Say N here unless you know what you are doing.
 689
 690 config BOOT_LOAD
 691         hex "Link/load address for booting" if BOOT_LOAD_BOOL
 692         default "0x00400000" if 40x || 8xx || 8260
 693         default "0x01000000" if 44x
 694         default "0x00800000"
 695
 696 config PIN_TLB
 697         bool "Pinned Kernel TLBs (860 ONLY)"
 698         depends on ADVANCED_OPTIONS && 8xx
 699 endmenu
 700
 701 if PPC64
 702 config KERNEL_START
 703         hex
 704         default "0xc000000000000000"
 705 endif
 706
 707 source "net/Kconfig"
 708
 709 source "drivers/Kconfig"
 710
 711 source "fs/Kconfig"
 712
 713 # XXX source "arch/ppc/8xx_io/Kconfig"
 714
 715 # XXX source "arch/ppc/8260_io/Kconfig"
 716
 717 source "arch/powerpc/sysdev/qe_lib/Kconfig"
 718
 719 source "lib/Kconfig"
 720
 721 source "arch/powerpc/Kconfig.debug"
 722
 723 source "security/Kconfig"
 724
 725 config KEYS_COMPAT
 726         bool
 727         depends on COMPAT && KEYS
 728         default y
 729
 730 source "crypto/Kconfig"
 731
 732 config PPC_CLOCK
 733         bool
 734         default n
 735
 736 config PPC_LIB_RHEAP
 737         bool
 738