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 ARCH_WANT_OPTIONAL_GPIOLIB
 102         select VIRT_TO_BUS if !PPC64
 103         select HAVE_IDE
 104         select HAVE_IOREMAP_PROT
 105         select HAVE_EFFICIENT_UNALIGNED_ACCESS if !CPU_LITTLE_ENDIAN
 106         select HAVE_KPROBES
 107         select HAVE_ARCH_KGDB
 108         select HAVE_KRETPROBES
 109         select HAVE_ARCH_TRACEHOOK
 110         select HAVE_MEMBLOCK
 111         select HAVE_MEMBLOCK_NODE_MAP
 112         select HAVE_DMA_API_DEBUG
 113         select HAVE_OPROFILE
 114         select HAVE_DEBUG_KMEMLEAK
 115         select ARCH_HAS_SG_CHAIN
 116         select GENERIC_ATOMIC64 if PPC32
 117         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 118         select HAVE_PERF_EVENTS
 119         select HAVE_PERF_REGS
 120         select HAVE_PERF_USER_STACK_DUMP
 121         select HAVE_REGS_AND_STACK_ACCESS_API
 122         select HAVE_HW_BREAKPOINT if PERF_EVENTS && PPC_BOOK3S_64
 123         select ARCH_WANT_IPC_PARSE_VERSION
 124         select SPARSE_IRQ
 125         select IRQ_DOMAIN
 126         select GENERIC_IRQ_SHOW
 127         select GENERIC_IRQ_SHOW_LEVEL
 128         select IRQ_FORCED_THREADING
 129         select HAVE_RCU_TABLE_FREE if SMP
 130         select HAVE_SYSCALL_TRACEPOINTS
 131         select HAVE_CBPF_JIT if CPU_BIG_ENDIAN
 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
 168 config GENERIC_CSUM
 169         def_bool CPU_LITTLE_ENDIAN
 170
 171 config EARLY_PRINTK
 172         bool
 173         default y
 174
 175 config PANIC_TIMEOUT
 176         int
 177         default 180
 178
 179 config COMPAT
 180         bool
 181         default y if PPC64
 182         select COMPAT_BINFMT_ELF
 183         select ARCH_WANT_OLD_COMPAT_IPC
 184         select COMPAT_OLD_SIGACTION
 185
 186 config SYSVIPC_COMPAT
 187         bool
 188         depends on COMPAT && SYSVIPC
 189         default y
 190
 191 # All PPC32s use generic nvram driver through ppc_md
 192 config GENERIC_NVRAM
 193         bool
 194         default y if PPC32
 195
 196 config SCHED_OMIT_FRAME_POINTER
 197         bool
 198         default y
 199
 200 config ARCH_MAY_HAVE_PC_FDC
 201         bool
 202         default PCI
 203
 204 config PPC_UDBG_16550
 205         bool
 206         default n
 207
 208 config GENERIC_TBSYNC
 209         bool
 210         default y if PPC32 && SMP
 211         default n
 212
 213 config AUDIT_ARCH
 214         bool
 215         default y
 216
 217 config GENERIC_BUG
 218         bool
 219         default y
 220         depends on BUG
 221
 222 config SYS_SUPPORTS_APM_EMULATION
 223         default y if PMAC_APM_EMU
 224         bool
 225
 226 config EPAPR_BOOT
 227         bool
 228         help
 229           Used to allow a board to specify it wants an ePAPR compliant wrapper.
 230         default n
 231
 232 config DEFAULT_UIMAGE
 233         bool
 234         help
 235           Used to allow a board to specify it wants a uImage built by default
 236         default n
 237
 238 config ARCH_HIBERNATION_POSSIBLE
 239         bool
 240         default y
 241
 242 config ARCH_SUSPEND_POSSIBLE
 243         def_bool y
 244         depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
 245                    (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
 246                    || 44x || 40x
 247
 248 config PPC_DCR_NATIVE
 249         bool
 250         default n
 251
 252 config PPC_DCR_MMIO
 253         bool
 254         default n
 255
 256 config PPC_DCR
 257         bool
 258         depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
 259         default y
 260
 261 config PPC_OF_PLATFORM_PCI
 262         bool
 263         depends on PCI
 264         depends on PPC64 # not supported on 32 bits yet
 265         default n
 266
 267 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
 268         depends on PPC32 || PPC_STD_MMU_64
 269         def_bool y
 270
 271 config ARCH_SUPPORTS_UPROBES
 272         def_bool y
 273
 274 config PPC_ADV_DEBUG_REGS
 275         bool
 276         depends on 40x || BOOKE
 277         default y
 278
 279 config PPC_ADV_DEBUG_IACS
 280         int
 281         depends on PPC_ADV_DEBUG_REGS
 282         default 4 if 44x
 283         default 2
 284
 285 config PPC_ADV_DEBUG_DACS
 286         int
 287         depends on PPC_ADV_DEBUG_REGS
 288         default 2
 289
 290 config PPC_ADV_DEBUG_DVCS
 291         int
 292         depends on PPC_ADV_DEBUG_REGS
 293         default 2 if 44x
 294         default 0
 295
 296 config PPC_ADV_DEBUG_DAC_RANGE
 297         bool
 298         depends on PPC_ADV_DEBUG_REGS && 44x
 299         default y
 300
 301 config PPC_EMULATE_SSTEP
 302         bool
 303         default y if KPROBES || UPROBES || XMON || HAVE_HW_BREAKPOINT
 304
 305 config ZONE_DMA32
 306         bool
 307         default y if PPC64
 308
 309 config PGTABLE_LEVELS
 310         int
 311         default 2 if !PPC64
 312         default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
 313         default 4
 314
 315 source "init/Kconfig"
 316
 317 source "kernel/Kconfig.freezer"
 318
 319 source "arch/powerpc/sysdev/Kconfig"
 320 source "arch/powerpc/platforms/Kconfig"
 321
 322 menu "Kernel options"
 323
 324 config HIGHMEM
 325         bool "High memory support"
 326         depends on PPC32
 327
 328 source kernel/Kconfig.hz
 329 source kernel/Kconfig.preempt
 330 source "fs/Kconfig.binfmt"
 331
 332 config HUGETLB_PAGE_SIZE_VARIABLE
 333         bool
 334         depends on HUGETLB_PAGE
 335         default y
 336
 337 config MATH_EMULATION
 338         bool "Math emulation"
 339         depends on 4xx || 8xx || PPC_MPC832x || BOOKE
 340         ---help---
 341           Some PowerPC chips designed for embedded applications do not have
 342           a floating-point unit and therefore do not implement the
 343           floating-point instructions in the PowerPC instruction set.  If you
 344           say Y here, the kernel will include code to emulate a floating-point
 345           unit, which will allow programs that use floating-point
 346           instructions to run.
 347
 348           This is also useful to emulate missing (optional) instructions
 349           such as fsqrt on cores that do have an FPU but do not implement
 350           them (such as Freescale BookE).
 351
 352 choice
 353         prompt "Math emulation options"
 354         default MATH_EMULATION_FULL
 355         depends on MATH_EMULATION
 356
 357 config  MATH_EMULATION_FULL
 358         bool "Emulate all the floating point instructions"
 359         ---help---
 360           Select this option will enable the kernel to support to emulate
 361           all the floating point instructions. If your SoC doesn't have
 362           a FPU, you should select this.
 363
 364 config MATH_EMULATION_HW_UNIMPLEMENTED
 365         bool "Just emulate the FPU unimplemented instructions"
 366         ---help---
 367           Select this if you know there does have a hardware FPU on your
 368           SoC, but some floating point instructions are not implemented by that.
 369
 370 endchoice
 371
 372 config PPC_TRANSACTIONAL_MEM
 373        bool "Transactional Memory support for POWERPC"
 374        depends on PPC_BOOK3S_64
 375        depends on SMP
 376        select ALTIVEC
 377        select VSX
 378        default n
 379        ---help---
 380          Support user-mode Transactional Memory on POWERPC.
 381
 382 config DISABLE_MPROFILE_KERNEL
 383         bool "Disable use of mprofile-kernel for kernel tracing"
 384         depends on PPC64 && CPU_LITTLE_ENDIAN
 385         default y
 386         help
 387           Selecting this options disables use of the mprofile-kernel ABI for
 388           kernel tracing. That will cause options such as live patching
 389           (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
 390           be disabled also.
 391
 392           If you have a toolchain which supports mprofile-kernel, then you can
 393           enable this. Otherwise leave it disabled. If you're not sure, say
 394           "N".
 395
 396 config MPROFILE_KERNEL
 397         depends on PPC64 && CPU_LITTLE_ENDIAN
 398         def_bool !DISABLE_MPROFILE_KERNEL
 399
 400 config IOMMU_HELPER
 401         def_bool PPC64
 402
 403 config SWIOTLB
 404         bool "SWIOTLB support"
 405         default n
 406         select IOMMU_HELPER
 407         ---help---
 408           Support for IO bounce buffering for systems without an IOMMU.
 409           This allows us to DMA to the full physical address space on
 410           platforms where the size of a physical address is larger
 411           than the bus address.  Not all platforms support this.
 412
 413 config HOTPLUG_CPU
 414         bool "Support for enabling/disabling CPUs"
 415         depends on SMP && (PPC_PSERIES || \
 416         PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
 417         ---help---
 418           Say Y here to be able to disable and re-enable individual
 419           CPUs at runtime on SMP machines.
 420
 421           Say N if you are unsure.
 422
 423 config ARCH_CPU_PROBE_RELEASE
 424         def_bool y
 425         depends on HOTPLUG_CPU
 426
 427 config ARCH_ENABLE_MEMORY_HOTPLUG
 428         def_bool y
 429
 430 config ARCH_HAS_WALK_MEMORY
 431         def_bool y
 432
 433 config ARCH_ENABLE_MEMORY_HOTREMOVE
 434         def_bool y
 435
 436 config PPC64_SUPPORTS_MEMORY_FAILURE
 437         bool "Add support for memory hwpoison"
 438         depends on PPC_BOOK3S_64
 439         default "y" if PPC_POWERNV
 440         select ARCH_SUPPORTS_MEMORY_FAILURE
 441
 442 config KEXEC
 443         bool "kexec system call"
 444         depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
 445         select KEXEC_CORE
 446         help
 447           kexec is a system call that implements the ability to shutdown your
 448           current kernel, and to start another kernel.  It is like a reboot
 449           but it is independent of the system firmware.   And like a reboot
 450           you can start any kernel with it, not just Linux.
 451
 452           The name comes from the similarity to the exec system call.
 453
 454           It is an ongoing process to be certain the hardware in a machine
 455           is properly shutdown, so do not be surprised if this code does not
 456           initially work for you.  As of this writing the exact hardware
 457           interface is strongly in flux, so no good recommendation can be
 458           made.
 459
 460 config CRASH_DUMP
 461         bool "Build a kdump crash kernel"
 462         depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
 463         select RELOCATABLE if (PPC64 && !COMPILE_TEST) || 44x || FSL_BOOKE
 464         help
 465           Build a kernel suitable for use as a kdump capture kernel.
 466           The same kernel binary can be used as production kernel and dump
 467           capture kernel.
 468
 469 config FA_DUMP
 470         bool "Firmware-assisted dump"
 471         depends on PPC64 && PPC_RTAS && CRASH_DUMP && KEXEC
 472         help
 473           A robust mechanism to get reliable kernel crash dump with
 474           assistance from firmware. This approach does not use kexec,
 475           instead firmware assists in booting the kdump kernel
 476           while preserving memory contents. Firmware-assisted dump
 477           is meant to be a kdump replacement offering robustness and
 478           speed not possible without system firmware assistance.
 479
 480           If unsure, say "N"
 481
 482 config IRQ_ALL_CPUS
 483         bool "Distribute interrupts on all CPUs by default"
 484         depends on SMP
 485         help
 486           This option gives the kernel permission to distribute IRQs across
 487           multiple CPUs.  Saying N here will route all IRQs to the first
 488           CPU.  Generally saying Y is safe, although some problems have been
 489           reported with SMP Power Macintoshes with this option enabled.
 490
 491 config NUMA
 492         bool "NUMA support"
 493         depends on PPC64
 494         default y if SMP && PPC_PSERIES
 495
 496 config NODES_SHIFT
 497         int
 498         default "8" if PPC64
 499         default "4"
 500         depends on NEED_MULTIPLE_NODES
 501
 502 config USE_PERCPU_NUMA_NODE_ID
 503         def_bool y
 504         depends on NUMA
 505
 506 config HAVE_MEMORYLESS_NODES
 507         def_bool y
 508         depends on NUMA
 509
 510 config ARCH_SELECT_MEMORY_MODEL
 511         def_bool y
 512         depends on PPC64
 513
 514 config ARCH_FLATMEM_ENABLE
 515         def_bool y
 516         depends on (PPC64 && !NUMA) || PPC32
 517
 518 config ARCH_SPARSEMEM_ENABLE
 519         def_bool y
 520         depends on PPC64
 521         select SPARSEMEM_VMEMMAP_ENABLE
 522
 523 config ARCH_SPARSEMEM_DEFAULT
 524         def_bool y
 525         depends on (SMP && PPC_PSERIES) || PPC_PS3
 526
 527 config SYS_SUPPORTS_HUGETLBFS
 528         bool
 529
 530 source "mm/Kconfig"
 531
 532 config ARCH_MEMORY_PROBE
 533         def_bool y
 534         depends on MEMORY_HOTPLUG
 535
 536 # Some NUMA nodes have memory ranges that span
 537 # other nodes.  Even though a pfn is valid and
 538 # between a node's start and end pfns, it may not
 539 # reside on that node.  See memmap_init_zone()
 540 # for details.
 541 config NODES_SPAN_OTHER_NODES
 542         def_bool y
 543         depends on NEED_MULTIPLE_NODES
 544
 545 config STDBINUTILS
 546         bool "Using standard binutils settings"
 547         depends on 44x
 548         default y
 549         help
 550           Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
 551           Note, that kernel will be able to run only those applications,
 552           which had been compiled using binutils later than 2.17.50.0.3 with
 553           '-zmax-page-size' set to 256K (the default is 64K). Or, if using
 554           the older binutils, you can patch them with a trivial patch, which
 555           changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
 556
 557 choice
 558         prompt "Page size"
 559         default PPC_4K_PAGES
 560         help
 561           Select the kernel logical page size. Increasing the page size
 562           will reduce software overhead at each page boundary, allow
 563           hardware prefetch mechanisms to be more effective, and allow
 564           larger dma transfers increasing IO efficiency and reducing
 565           overhead. However the utilization of memory will increase.
 566           For example, each cached file will using a multiple of the
 567           page size to hold its contents and the difference between the
 568           end of file and the end of page is wasted.
 569
 570           Some dedicated systems, such as software raid serving with
 571           accelerated calculations, have shown significant increases.
 572
 573           If you configure a 64 bit kernel for 64k pages but the
 574           processor does not support them, then the kernel will simulate
 575           them with 4k pages, loading them on demand, but with the
 576           reduced software overhead and larger internal fragmentation.
 577           For the 32 bit kernel, a large page option will not be offered
 578           unless it is supported by the configured processor.
 579
 580           If unsure, choose 4K_PAGES.
 581
 582 config PPC_4K_PAGES
 583         bool "4k page size"
 584         select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
 585
 586 config PPC_16K_PAGES
 587         bool "16k page size"
 588         depends on 44x || PPC_8xx
 589
 590 config PPC_64K_PAGES
 591         bool "64k page size"
 592         depends on !PPC_FSL_BOOK3E && (44x || PPC_STD_MMU_64 || PPC_BOOK3E_64)
 593         select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
 594
 595 config PPC_256K_PAGES
 596         bool "256k page size"
 597         depends on 44x && !STDBINUTILS
 598         help
 599           Make the page size 256k.
 600
 601           As the ELF standard only requires alignment to support page
 602           sizes up to 64k, you will need to compile all of your user
 603           space applications with a non-standard binutils settings
 604           (see the STDBINUTILS description for details).
 605
 606           Say N unless you know what you are doing.
 607
 608 endchoice
 609
 610 config FORCE_MAX_ZONEORDER
 611         int "Maximum zone order"
 612         range 8 9 if PPC64 && PPC_64K_PAGES
 613         default "9" if PPC64 && PPC_64K_PAGES
 614         range 9 13 if PPC64 && !PPC_64K_PAGES
 615         default "13" if PPC64 && !PPC_64K_PAGES
 616         range 9 64 if PPC32 && PPC_16K_PAGES
 617         default "9" if PPC32 && PPC_16K_PAGES
 618         range 7 64 if PPC32 && PPC_64K_PAGES
 619         default "7" if PPC32 && PPC_64K_PAGES
 620         range 5 64 if PPC32 && PPC_256K_PAGES
 621         default "5" if PPC32 && PPC_256K_PAGES
 622         range 11 64
 623         default "11"
 624         help
 625           The kernel memory allocator divides physically contiguous memory
 626           blocks into "zones", where each zone is a power of two number of
 627           pages.  This option selects the largest power of two that the kernel
 628           keeps in the memory allocator.  If you need to allocate very large
 629           blocks of physically contiguous memory, then you may need to
 630           increase this value.
 631
 632           This config option is actually maximum order plus one. For example,
 633           a value of 11 means that the largest free memory block is 2^10 pages.
 634
 635           The page size is not necessarily 4KB.  For example, on 64-bit
 636           systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES.  Keep
 637           this in mind when choosing a value for this option.
 638
 639 config PPC_SUBPAGE_PROT
 640         bool "Support setting protections for 4k subpages"
 641         depends on PPC_STD_MMU_64 && PPC_64K_PAGES
 642         help
 643           This option adds support for a system call to allow user programs
 644           to set access permissions (read/write, readonly, or no access)
 645           on the 4k subpages of each 64k page.
 646
 647 config PPC_COPRO_BASE
 648         bool
 649         default n
 650
 651 config SCHED_SMT
 652         bool "SMT (Hyperthreading) scheduler support"
 653         depends on PPC64 && SMP
 654         help
 655           SMT scheduler support improves the CPU scheduler's decision making
 656           when dealing with POWER5 cpus at a cost of slightly increased
 657           overhead in some places. If unsure say N here.
 658
 659 config PPC_DENORMALISATION
 660         bool "PowerPC denormalisation exception handling"
 661         depends on PPC_BOOK3S_64
 662         default "y" if PPC_POWERNV
 663         ---help---
 664           Add support for handling denormalisation of single precision
 665           values.  Useful for bare metal only.  If unsure say Y here.
 666
 667 config CMDLINE_BOOL
 668         bool "Default bootloader kernel arguments"
 669
 670 config CMDLINE
 671         string "Initial kernel command string"
 672         depends on CMDLINE_BOOL
 673         default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
 674         help
 675           On some platforms, there is currently no way for the boot loader to
 676           pass arguments to the kernel. For these platforms, you can supply
 677           some command-line options at build time by entering them here.  In
 678           most cases you will need to specify the root device here.
 679
 680 config CMDLINE_FORCE
 681         bool "Always use the default kernel command string"
 682         depends on CMDLINE_BOOL
 683         help
 684           Always use the default kernel command string, even if the boot
 685           loader passes other arguments to the kernel.
 686           This is useful if you cannot or don't want to change the
 687           command-line options your boot loader passes to the kernel.
 688
 689 config EXTRA_TARGETS
 690         string "Additional default image types"
 691         help
 692           List additional targets to be built by the bootwrapper here (separated
 693           by spaces).  This is useful for targets that depend of device tree
 694           files in the .dts directory.
 695
 696           Targets in this list will be build as part of the default build
 697           target, or when the user does a 'make zImage' or a
 698           'make zImage.initrd'.
 699
 700           If unsure, leave blank
 701
 702 config ARCH_WANTS_FREEZER_CONTROL
 703         def_bool y
 704         depends on ADB_PMU
 705
 706 source kernel/power/Kconfig
 707
 708 config SECCOMP
 709         bool "Enable seccomp to safely compute untrusted bytecode"
 710         depends on PROC_FS
 711         default y
 712         help
 713           This kernel feature is useful for number crunching applications
 714           that may need to compute untrusted bytecode during their
 715           execution. By using pipes or other transports made available to
 716           the process as file descriptors supporting the read/write
 717           syscalls, it's possible to isolate those applications in
 718           their own address space using seccomp. Once seccomp is
 719           enabled via /proc/<pid>/seccomp, it cannot be disabled
 720           and the task is only allowed to execute a few safe syscalls
 721           defined by each seccomp mode.
 722
 723           If unsure, say Y. Only embedded should say N here.
 724
 725 endmenu
 726
 727 config ISA_DMA_API
 728         bool
 729         default PCI
 730
 731 menu "Bus options"
 732
 733 config ISA
 734         bool "Support for ISA-bus hardware"
 735         depends on PPC_CHRP
 736         select PPC_I8259
 737         help
 738           Find out whether you have ISA slots on your motherboard.  ISA is the
 739           name of a bus system, i.e. the way the CPU talks to the other stuff
 740           inside your box.  If you have an Apple machine, say N here; if you
 741           have an IBM RS/6000 or pSeries machine, say Y.  If you have an
 742           embedded board, consult your board documentation.
 743
 744 config ZONE_DMA
 745         bool
 746         default y
 747
 748 config NEED_DMA_MAP_STATE
 749         def_bool (PPC64 || NOT_COHERENT_CACHE)
 750
 751 config NEED_SG_DMA_LENGTH
 752         def_bool y
 753
 754 config GENERIC_ISA_DMA
 755         bool
 756         depends on ISA_DMA_API
 757         default y
 758
 759 config PPC_INDIRECT_PCI
 760         bool
 761         depends on PCI
 762         default y if 40x || 44x
 763         default n
 764
 765 config EISA
 766         bool
 767
 768 config SBUS
 769         bool
 770
 771 config FSL_SOC
 772         bool
 773
 774 config FSL_PCI
 775         bool
 776         select PPC_INDIRECT_PCI
 777         select PCI_QUIRKS
 778
 779 config FSL_PMC
 780         bool
 781         default y
 782         depends on SUSPEND && (PPC_85xx || PPC_86xx)
 783         help
 784           Freescale MPC85xx/MPC86xx power management controller support
 785           (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
 786
 787 config PPC4xx_CPM
 788         bool
 789         default y
 790         depends on SUSPEND && (44x || 40x)
 791         help
 792           PPC4xx Clock Power Management (CPM) support (suspend/resume).
 793           It also enables support for two different idle states (idle-wait
 794           and idle-doze).
 795
 796 config 4xx_SOC
 797         bool
 798
 799 config FSL_LBC
 800         bool "Freescale Local Bus support"
 801         help
 802           Enables reporting of errors from the Freescale local bus
 803           controller.  Also contains some common code used by
 804           drivers for specific local bus peripherals.
 805
 806 config FSL_GTM
 807         bool
 808         depends on PPC_83xx || QUICC_ENGINE || CPM2
 809         help
 810           Freescale General-purpose Timers support
 811
 812 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
 813 config MCA
 814         bool
 815
 816 # Platforms that what PCI turned unconditionally just do select PCI
 817 # in their config node.  Platforms that want to choose at config
 818 # time should select PPC_PCI_CHOICE
 819 config PPC_PCI_CHOICE
 820         bool
 821
 822 config PCI
 823         bool "PCI support" if PPC_PCI_CHOICE
 824         default y if !40x && !CPM2 && !8xx && !PPC_83xx \
 825                 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
 826         default PCI_QSPAN if !4xx && !CPM2 && 8xx
 827         select GENERIC_PCI_IOMAP
 828         help
 829           Find out whether your system includes a PCI bus. PCI is the name of
 830           a bus system, i.e. the way the CPU talks to the other stuff inside
 831           your box.  If you say Y here, the kernel will include drivers and
 832           infrastructure code to support PCI bus devices.
 833
 834 config PCI_DOMAINS
 835         def_bool PCI
 836
 837 config PCI_SYSCALL
 838         def_bool PCI
 839
 840 config PCI_QSPAN
 841         bool "QSpan PCI"
 842         depends on !4xx && !CPM2 && 8xx
 843         select PPC_I8259
 844         help
 845           Say Y here if you have a system based on a Motorola 8xx-series
 846           embedded processor with a QSPAN PCI interface, otherwise say N.
 847
 848 config PCI_8260
 849         bool
 850         depends on PCI && 8260
 851         select PPC_INDIRECT_PCI
 852         default y
 853
 854 source "drivers/pci/Kconfig"
 855
 856 source "drivers/pcmcia/Kconfig"
 857
 858 config HAS_RAPIDIO
 859         bool
 860         default n
 861
 862 config RAPIDIO
 863         tristate "RapidIO support"
 864         depends on HAS_RAPIDIO || PCI
 865         help
 866           If you say Y here, the kernel will include drivers and
 867           infrastructure code to support RapidIO interconnect devices.
 868
 869 config FSL_RIO
 870         bool "Freescale Embedded SRIO Controller support"
 871         depends on RAPIDIO = y && HAS_RAPIDIO
 872         default "n"
 873         ---help---
 874           Include support for RapidIO controller on Freescale embedded
 875           processors (MPC8548, MPC8641, etc).
 876
 877 source "drivers/rapidio/Kconfig"
 878
 879 endmenu
 880
 881 config NONSTATIC_KERNEL
 882         bool
 883         default n
 884
 885 menu "Advanced setup"
 886         depends on PPC32
 887
 888 config ADVANCED_OPTIONS
 889         bool "Prompt for advanced kernel configuration options"
 890         help
 891           This option will enable prompting for a variety of advanced kernel
 892           configuration options.  These options can cause the kernel to not
 893           work if they are set incorrectly, but can be used to optimize certain
 894           aspects of kernel memory management.
 895
 896           Unless you know what you are doing, say N here.
 897
 898 comment "Default settings for advanced configuration options are used"
 899         depends on !ADVANCED_OPTIONS
 900
 901 config LOWMEM_SIZE_BOOL
 902         bool "Set maximum low memory"
 903         depends on ADVANCED_OPTIONS
 904         help
 905           This option allows you to set the maximum amount of memory which
 906           will be used as "low memory", that is, memory which the kernel can
 907           access directly, without having to set up a kernel virtual mapping.
 908           This can be useful in optimizing the layout of kernel virtual
 909           memory.
 910
 911           Say N here unless you know what you are doing.
 912
 913 config LOWMEM_SIZE
 914         hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
 915         default "0x30000000"
 916
 917 config LOWMEM_CAM_NUM_BOOL
 918         bool "Set number of CAMs to use to map low memory"
 919         depends on ADVANCED_OPTIONS && FSL_BOOKE
 920         help
 921           This option allows you to set the maximum number of CAM slots that
 922           will be used to map low memory.  There are a limited number of slots
 923           available and even more limited number that will fit in the L1 MMU.
 924           However, using more entries will allow mapping more low memory.  This
 925           can be useful in optimizing the layout of kernel virtual memory.
 926
 927           Say N here unless you know what you are doing.
 928
 929 config LOWMEM_CAM_NUM
 930         depends on FSL_BOOKE
 931         int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
 932         default 3
 933
 934 config DYNAMIC_MEMSTART
 935         bool "Enable page aligned dynamic load address for kernel"
 936         depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
 937         select NONSTATIC_KERNEL
 938         help
 939           This option enables the kernel to be loaded at any page aligned
 940           physical address. The kernel creates a mapping from KERNELBASE to
 941           the address where the kernel is loaded. The page size here implies
 942           the TLB page size of the mapping for kernel on the particular platform.
 943           Please refer to the init code for finding the TLB page size.
 944
 945           DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
 946           kernel image, where the only restriction is the page aligned kernel
 947           load address. When this option is enabled, the compile time physical
 948           address CONFIG_PHYSICAL_START is ignored.
 949
 950           This option is overridden by CONFIG_RELOCATABLE
 951
 952 config RELOCATABLE
 953         bool "Build a relocatable kernel"
 954         depends on ADVANCED_OPTIONS && FLATMEM && (44x || FSL_BOOKE)
 955         select NONSTATIC_KERNEL
 956         help
 957           This builds a kernel image that is capable of running at the
 958           location the kernel is loaded at, without any alignment restrictions.
 959           This feature is a superset of DYNAMIC_MEMSTART and hence overrides it.
 960
 961           One use is for the kexec on panic case where the recovery kernel
 962           must live at a different physical address than the primary
 963           kernel.
 964
 965           Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
 966           it has been loaded at and the compile time physical addresses
 967           CONFIG_PHYSICAL_START is ignored.  However CONFIG_PHYSICAL_START
 968           setting can still be useful to bootwrappers that need to know the
 969           load address of the kernel (eg. u-boot/mkimage).
 970
 971 config RELOCATABLE_PPC32
 972         def_bool y
 973         depends on PPC32 && RELOCATABLE
 974
 975 config PAGE_OFFSET_BOOL
 976         bool "Set custom page offset address"
 977         depends on ADVANCED_OPTIONS
 978         help
 979           This option allows you to set the kernel virtual address at which
 980           the kernel will map low memory.  This can be useful in optimizing
 981           the virtual memory layout of the system.
 982
 983           Say N here unless you know what you are doing.
 984
 985 config PAGE_OFFSET
 986         hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
 987         default "0xc0000000"
 988
 989 config KERNEL_START_BOOL
 990         bool "Set custom kernel base address"
 991         depends on ADVANCED_OPTIONS
 992         help
 993           This option allows you to set the kernel virtual address at which
 994           the kernel will be loaded.  Normally this should match PAGE_OFFSET
 995           however there are times (like kdump) that one might not want them
 996           to be the same.
 997
 998           Say N here unless you know what you are doing.
 999
1000 config KERNEL_START
1001         hex "Virtual address of kernel base" if KERNEL_START_BOOL
1002         default PAGE_OFFSET if PAGE_OFFSET_BOOL
1003         default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1004         default "0xc0000000"
1005
1006 config PHYSICAL_START_BOOL
1007         bool "Set physical address where the kernel is loaded"
1008         depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1009         help
1010           This gives the physical address where the kernel is loaded.
1011
1012           Say N here unless you know what you are doing.
1013
1014 config PHYSICAL_START
1015         hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1016         default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1017         default "0x00000000"
1018
1019 config PHYSICAL_ALIGN
1020         hex
1021         default "0x04000000" if FSL_BOOKE
1022         help
1023           This value puts the alignment restrictions on physical address
1024           where kernel is loaded and run from. Kernel is compiled for an
1025           address which meets above alignment restriction.
1026
1027 config TASK_SIZE_BOOL
1028         bool "Set custom user task size"
1029         depends on ADVANCED_OPTIONS
1030         help
1031           This option allows you to set the amount of virtual address space
1032           allocated to user tasks.  This can be useful in optimizing the
1033           virtual memory layout of the system.
1034
1035           Say N here unless you know what you are doing.
1036
1037 config TASK_SIZE
1038         hex "Size of user task space" if TASK_SIZE_BOOL
1039         default "0x80000000" if PPC_8xx
1040         default "0xc0000000"
1041
1042 config CONSISTENT_SIZE_BOOL
1043         bool "Set custom consistent memory pool size"
1044         depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1045         help
1046           This option allows you to set the size of the
1047           consistent memory pool.  This pool of virtual memory
1048           is used to make consistent memory allocations.
1049
1050 config CONSISTENT_SIZE
1051         hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1052         default "0x00200000" if NOT_COHERENT_CACHE
1053
1054 config PIN_TLB
1055         bool "Pinned Kernel TLBs (860 ONLY)"
1056         depends on ADVANCED_OPTIONS && 8xx
1057 endmenu
1058
1059 if PPC64
1060 config RELOCATABLE
1061         bool "Build a relocatable kernel"
1062         depends on !COMPILE_TEST
1063         select NONSTATIC_KERNEL
1064         help
1065           This builds a kernel image that is capable of running anywhere
1066           in the RMA (real memory area) at any 16k-aligned base address.
1067           The kernel is linked as a position-independent executable (PIE)
1068           and contains dynamic relocations which are processed early
1069           in the bootup process.
1070
1071           One use is for the kexec on panic case where the recovery kernel
1072           must live at a different physical address than the primary
1073           kernel.
1074
1075 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1076 config PAGE_OFFSET
1077         hex
1078         default "0xc000000000000000"
1079 config KERNEL_START
1080         hex
1081         default "0xc000000000000000"
1082 config PHYSICAL_START
1083         hex
1084         default "0x00000000"
1085 endif
1086
1087 config  ARCH_RANDOM
1088         def_bool n
1089
1090 source "net/Kconfig"
1091
1092 source "drivers/Kconfig"
1093
1094 source "fs/Kconfig"
1095
1096 source "lib/Kconfig"
1097
1098 source "arch/powerpc/Kconfig.debug"
1099
1100 source "security/Kconfig"
1101
1102 config KEYS_COMPAT
1103         bool
1104         depends on COMPAT && KEYS
1105         default y
1106
1107 source "crypto/Kconfig"
1108
1109 config PPC_LIB_RHEAP
1110         bool
1111
1112 source "arch/powerpc/kvm/Kconfig"
1113
1114 source "kernel/livepatch/Kconfig"