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         select HAVE_ARCH_HARDENED_USERCOPY
 168
 169 config GENERIC_CSUM
 170         def_bool CPU_LITTLE_ENDIAN
 171
 172 config EARLY_PRINTK
 173         bool
 174         default y
 175
 176 config PANIC_TIMEOUT
 177         int
 178         default 180
 179
 180 config COMPAT
 181         bool
 182         default y if PPC64
 183         select COMPAT_BINFMT_ELF
 184         select ARCH_WANT_OLD_COMPAT_IPC
 185         select COMPAT_OLD_SIGACTION
 186
 187 config SYSVIPC_COMPAT
 188         bool
 189         depends on COMPAT && SYSVIPC
 190         default y
 191
 192 # All PPC32s use generic nvram driver through ppc_md
 193 config GENERIC_NVRAM
 194         bool
 195         default y if PPC32
 196
 197 config SCHED_OMIT_FRAME_POINTER
 198         bool
 199         default y
 200
 201 config ARCH_MAY_HAVE_PC_FDC
 202         bool
 203         default PCI
 204
 205 config PPC_UDBG_16550
 206         bool
 207         default n
 208
 209 config GENERIC_TBSYNC
 210         bool
 211         default y if PPC32 && SMP
 212         default n
 213
 214 config AUDIT_ARCH
 215         bool
 216         default y
 217
 218 config GENERIC_BUG
 219         bool
 220         default y
 221         depends on BUG
 222
 223 config SYS_SUPPORTS_APM_EMULATION
 224         default y if PMAC_APM_EMU
 225         bool
 226
 227 config EPAPR_BOOT
 228         bool
 229         help
 230           Used to allow a board to specify it wants an ePAPR compliant wrapper.
 231         default n
 232
 233 config DEFAULT_UIMAGE
 234         bool
 235         help
 236           Used to allow a board to specify it wants a uImage built by default
 237         default n
 238
 239 config ARCH_HIBERNATION_POSSIBLE
 240         bool
 241         default y
 242
 243 config ARCH_SUSPEND_POSSIBLE
 244         def_bool y
 245         depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
 246                    (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
 247                    || 44x || 40x
 248
 249 config PPC_DCR_NATIVE
 250         bool
 251         default n
 252
 253 config PPC_DCR_MMIO
 254         bool
 255         default n
 256
 257 config PPC_DCR
 258         bool
 259         depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
 260         default y
 261
 262 config PPC_OF_PLATFORM_PCI
 263         bool
 264         depends on PCI
 265         depends on PPC64 # not supported on 32 bits yet
 266         default n
 267
 268 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
 269         depends on PPC32 || PPC_STD_MMU_64
 270         def_bool y
 271
 272 config ARCH_SUPPORTS_UPROBES
 273         def_bool y
 274
 275 config PPC_ADV_DEBUG_REGS
 276         bool
 277         depends on 40x || BOOKE
 278         default y
 279
 280 config PPC_ADV_DEBUG_IACS
 281         int
 282         depends on PPC_ADV_DEBUG_REGS
 283         default 4 if 44x
 284         default 2
 285
 286 config PPC_ADV_DEBUG_DACS
 287         int
 288         depends on PPC_ADV_DEBUG_REGS
 289         default 2
 290
 291 config PPC_ADV_DEBUG_DVCS
 292         int
 293         depends on PPC_ADV_DEBUG_REGS
 294         default 2 if 44x
 295         default 0
 296
 297 config PPC_ADV_DEBUG_DAC_RANGE
 298         bool
 299         depends on PPC_ADV_DEBUG_REGS && 44x
 300         default y
 301
 302 config PPC_EMULATE_SSTEP
 303         bool
 304         default y if KPROBES || UPROBES || XMON || HAVE_HW_BREAKPOINT
 305
 306 config ZONE_DMA32
 307         bool
 308         default y if PPC64
 309
 310 config PGTABLE_LEVELS
 311         int
 312         default 2 if !PPC64
 313         default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
 314         default 4
 315
 316 source "init/Kconfig"
 317
 318 source "kernel/Kconfig.freezer"
 319
 320 source "arch/powerpc/sysdev/Kconfig"
 321 source "arch/powerpc/platforms/Kconfig"
 322
 323 menu "Kernel options"
 324
 325 config HIGHMEM
 326         bool "High memory support"
 327         depends on PPC32
 328
 329 source kernel/Kconfig.hz
 330 source kernel/Kconfig.preempt
 331 source "fs/Kconfig.binfmt"
 332
 333 config HUGETLB_PAGE_SIZE_VARIABLE
 334         bool
 335         depends on HUGETLB_PAGE
 336         default y
 337
 338 config MATH_EMULATION
 339         bool "Math emulation"
 340         depends on 4xx || 8xx || PPC_MPC832x || BOOKE
 341         ---help---
 342           Some PowerPC chips designed for embedded applications do not have
 343           a floating-point unit and therefore do not implement the
 344           floating-point instructions in the PowerPC instruction set.  If you
 345           say Y here, the kernel will include code to emulate a floating-point
 346           unit, which will allow programs that use floating-point
 347           instructions to run.
 348
 349           This is also useful to emulate missing (optional) instructions
 350           such as fsqrt on cores that do have an FPU but do not implement
 351           them (such as Freescale BookE).
 352
 353 choice
 354         prompt "Math emulation options"
 355         default MATH_EMULATION_FULL
 356         depends on MATH_EMULATION
 357
 358 config  MATH_EMULATION_FULL
 359         bool "Emulate all the floating point instructions"
 360         ---help---
 361           Select this option will enable the kernel to support to emulate
 362           all the floating point instructions. If your SoC doesn't have
 363           a FPU, you should select this.
 364
 365 config MATH_EMULATION_HW_UNIMPLEMENTED
 366         bool "Just emulate the FPU unimplemented instructions"
 367         ---help---
 368           Select this if you know there does have a hardware FPU on your
 369           SoC, but some floating point instructions are not implemented by that.
 370
 371 endchoice
 372
 373 config PPC_TRANSACTIONAL_MEM
 374        bool "Transactional Memory support for POWERPC"
 375        depends on PPC_BOOK3S_64
 376        depends on SMP
 377        select ALTIVEC
 378        select VSX
 379        default n
 380        ---help---
 381          Support user-mode Transactional Memory on POWERPC.
 382
 383 config DISABLE_MPROFILE_KERNEL
 384         bool "Disable use of mprofile-kernel for kernel tracing"
 385         depends on PPC64 && CPU_LITTLE_ENDIAN
 386         default y
 387         help
 388           Selecting this options disables use of the mprofile-kernel ABI for
 389           kernel tracing. That will cause options such as live patching
 390           (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
 391           be disabled also.
 392
 393           If you have a toolchain which supports mprofile-kernel, then you can
 394           enable this. Otherwise leave it disabled. If you're not sure, say
 395           "N".
 396
 397 config MPROFILE_KERNEL
 398         depends on PPC64 && CPU_LITTLE_ENDIAN
 399         def_bool !DISABLE_MPROFILE_KERNEL
 400
 401 config IOMMU_HELPER
 402         def_bool PPC64
 403
 404 config SWIOTLB
 405         bool "SWIOTLB support"
 406         default n
 407         select IOMMU_HELPER
 408         ---help---
 409           Support for IO bounce buffering for systems without an IOMMU.
 410           This allows us to DMA to the full physical address space on
 411           platforms where the size of a physical address is larger
 412           than the bus address.  Not all platforms support this.
 413
 414 config HOTPLUG_CPU
 415         bool "Support for enabling/disabling CPUs"
 416         depends on SMP && (PPC_PSERIES || \
 417         PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
 418         ---help---
 419           Say Y here to be able to disable and re-enable individual
 420           CPUs at runtime on SMP machines.
 421
 422           Say N if you are unsure.
 423
 424 config ARCH_CPU_PROBE_RELEASE
 425         def_bool y
 426         depends on HOTPLUG_CPU
 427
 428 config ARCH_ENABLE_MEMORY_HOTPLUG
 429         def_bool y
 430
 431 config ARCH_HAS_WALK_MEMORY
 432         def_bool y
 433
 434 config ARCH_ENABLE_MEMORY_HOTREMOVE
 435         def_bool y
 436
 437 config PPC64_SUPPORTS_MEMORY_FAILURE
 438         bool "Add support for memory hwpoison"
 439         depends on PPC_BOOK3S_64
 440         default "y" if PPC_POWERNV
 441         select ARCH_SUPPORTS_MEMORY_FAILURE
 442
 443 config KEXEC
 444         bool "kexec system call"
 445         depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
 446         select KEXEC_CORE
 447         help
 448           kexec is a system call that implements the ability to shutdown your
 449           current kernel, and to start another kernel.  It is like a reboot
 450           but it is independent of the system firmware.   And like a reboot
 451           you can start any kernel with it, not just Linux.
 452
 453           The name comes from the similarity to the exec system call.
 454
 455           It is an ongoing process to be certain the hardware in a machine
 456           is properly shutdown, so do not be surprised if this code does not
 457           initially work for you.  As of this writing the exact hardware
 458           interface is strongly in flux, so no good recommendation can be
 459           made.
 460
 461 config CRASH_DUMP
 462         bool "Build a kdump crash kernel"
 463         depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
 464         select RELOCATABLE if (PPC64 && !COMPILE_TEST) || 44x || FSL_BOOKE
 465         help
 466           Build a kernel suitable for use as a kdump capture kernel.
 467           The same kernel binary can be used as production kernel and dump
 468           capture kernel.
 469
 470 config FA_DUMP
 471         bool "Firmware-assisted dump"
 472         depends on PPC64 && PPC_RTAS && CRASH_DUMP && KEXEC
 473         help
 474           A robust mechanism to get reliable kernel crash dump with
 475           assistance from firmware. This approach does not use kexec,
 476           instead firmware assists in booting the kdump kernel
 477           while preserving memory contents. Firmware-assisted dump
 478           is meant to be a kdump replacement offering robustness and
 479           speed not possible without system firmware assistance.
 480
 481           If unsure, say "N"
 482
 483 config IRQ_ALL_CPUS
 484         bool "Distribute interrupts on all CPUs by default"
 485         depends on SMP
 486         help
 487           This option gives the kernel permission to distribute IRQs across
 488           multiple CPUs.  Saying N here will route all IRQs to the first
 489           CPU.  Generally saying Y is safe, although some problems have been
 490           reported with SMP Power Macintoshes with this option enabled.
 491
 492 config NUMA
 493         bool "NUMA support"
 494         depends on PPC64
 495         default y if SMP && PPC_PSERIES
 496
 497 config NODES_SHIFT
 498         int
 499         default "8" if PPC64
 500         default "4"
 501         depends on NEED_MULTIPLE_NODES
 502
 503 config USE_PERCPU_NUMA_NODE_ID
 504         def_bool y
 505         depends on NUMA
 506
 507 config HAVE_MEMORYLESS_NODES
 508         def_bool y
 509         depends on NUMA
 510
 511 config ARCH_SELECT_MEMORY_MODEL
 512         def_bool y
 513         depends on PPC64
 514
 515 config ARCH_FLATMEM_ENABLE
 516         def_bool y
 517         depends on (PPC64 && !NUMA) || PPC32
 518
 519 config ARCH_SPARSEMEM_ENABLE
 520         def_bool y
 521         depends on PPC64
 522         select SPARSEMEM_VMEMMAP_ENABLE
 523
 524 config ARCH_SPARSEMEM_DEFAULT
 525         def_bool y
 526         depends on (SMP && PPC_PSERIES) || PPC_PS3
 527
 528 config SYS_SUPPORTS_HUGETLBFS
 529         bool
 530
 531 source "mm/Kconfig"
 532
 533 config ARCH_MEMORY_PROBE
 534         def_bool y
 535         depends on MEMORY_HOTPLUG
 536
 537 # Some NUMA nodes have memory ranges that span
 538 # other nodes.  Even though a pfn is valid and
 539 # between a node's start and end pfns, it may not
 540 # reside on that node.  See memmap_init_zone()
 541 # for details.
 542 config NODES_SPAN_OTHER_NODES
 543         def_bool y
 544         depends on NEED_MULTIPLE_NODES
 545
 546 config STDBINUTILS
 547         bool "Using standard binutils settings"
 548         depends on 44x
 549         default y
 550         help
 551           Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
 552           Note, that kernel will be able to run only those applications,
 553           which had been compiled using binutils later than 2.17.50.0.3 with
 554           '-zmax-page-size' set to 256K (the default is 64K). Or, if using
 555           the older binutils, you can patch them with a trivial patch, which
 556           changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
 557
 558 choice
 559         prompt "Page size"
 560         default PPC_4K_PAGES
 561         help
 562           Select the kernel logical page size. Increasing the page size
 563           will reduce software overhead at each page boundary, allow
 564           hardware prefetch mechanisms to be more effective, and allow
 565           larger dma transfers increasing IO efficiency and reducing
 566           overhead. However the utilization of memory will increase.
 567           For example, each cached file will using a multiple of the
 568           page size to hold its contents and the difference between the
 569           end of file and the end of page is wasted.
 570
 571           Some dedicated systems, such as software raid serving with
 572           accelerated calculations, have shown significant increases.
 573
 574           If you configure a 64 bit kernel for 64k pages but the
 575           processor does not support them, then the kernel will simulate
 576           them with 4k pages, loading them on demand, but with the
 577           reduced software overhead and larger internal fragmentation.
 578           For the 32 bit kernel, a large page option will not be offered
 579           unless it is supported by the configured processor.
 580
 581           If unsure, choose 4K_PAGES.
 582
 583 config PPC_4K_PAGES
 584         bool "4k page size"
 585         select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
 586
 587 config PPC_16K_PAGES
 588         bool "16k page size"
 589         depends on 44x || PPC_8xx
 590
 591 config PPC_64K_PAGES
 592         bool "64k page size"
 593         depends on !PPC_FSL_BOOK3E && (44x || PPC_STD_MMU_64 || PPC_BOOK3E_64)
 594         select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
 595
 596 config PPC_256K_PAGES
 597         bool "256k page size"
 598         depends on 44x && !STDBINUTILS
 599         help
 600           Make the page size 256k.
 601
 602           As the ELF standard only requires alignment to support page
 603           sizes up to 64k, you will need to compile all of your user
 604           space applications with a non-standard binutils settings
 605           (see the STDBINUTILS description for details).
 606
 607           Say N unless you know what you are doing.
 608
 609 endchoice
 610
 611 config FORCE_MAX_ZONEORDER
 612         int "Maximum zone order"
 613         range 8 9 if PPC64 && PPC_64K_PAGES
 614         default "9" if PPC64 && PPC_64K_PAGES
 615         range 9 13 if PPC64 && !PPC_64K_PAGES
 616         default "13" if PPC64 && !PPC_64K_PAGES
 617         range 9 64 if PPC32 && PPC_16K_PAGES
 618         default "9" if PPC32 && PPC_16K_PAGES
 619         range 7 64 if PPC32 && PPC_64K_PAGES
 620         default "7" if PPC32 && PPC_64K_PAGES
 621         range 5 64 if PPC32 && PPC_256K_PAGES
 622         default "5" if PPC32 && PPC_256K_PAGES
 623         range 11 64
 624         default "11"
 625         help
 626           The kernel memory allocator divides physically contiguous memory
 627           blocks into "zones", where each zone is a power of two number of
 628           pages.  This option selects the largest power of two that the kernel
 629           keeps in the memory allocator.  If you need to allocate very large
 630           blocks of physically contiguous memory, then you may need to
 631           increase this value.
 632
 633           This config option is actually maximum order plus one. For example,
 634           a value of 11 means that the largest free memory block is 2^10 pages.
 635
 636           The page size is not necessarily 4KB.  For example, on 64-bit
 637           systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES.  Keep
 638           this in mind when choosing a value for this option.
 639
 640 config PPC_SUBPAGE_PROT
 641         bool "Support setting protections for 4k subpages"
 642         depends on PPC_STD_MMU_64 && PPC_64K_PAGES
 643         help
 644           This option adds support for a system call to allow user programs
 645           to set access permissions (read/write, readonly, or no access)
 646           on the 4k subpages of each 64k page.
 647
 648 config PPC_COPRO_BASE
 649         bool
 650         default n
 651
 652 config SCHED_SMT
 653         bool "SMT (Hyperthreading) scheduler support"
 654         depends on PPC64 && SMP
 655         help
 656           SMT scheduler support improves the CPU scheduler's decision making
 657           when dealing with POWER5 cpus at a cost of slightly increased
 658           overhead in some places. If unsure say N here.
 659
 660 config PPC_DENORMALISATION
 661         bool "PowerPC denormalisation exception handling"
 662         depends on PPC_BOOK3S_64
 663         default "y" if PPC_POWERNV
 664         ---help---
 665           Add support for handling denormalisation of single precision
 666           values.  Useful for bare metal only.  If unsure say Y here.
 667
 668 config CMDLINE_BOOL
 669         bool "Default bootloader kernel arguments"
 670
 671 config CMDLINE
 672         string "Initial kernel command string"
 673         depends on CMDLINE_BOOL
 674         default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
 675         help
 676           On some platforms, there is currently no way for the boot loader to
 677           pass arguments to the kernel. For these platforms, you can supply
 678           some command-line options at build time by entering them here.  In
 679           most cases you will need to specify the root device here.
 680
 681 config CMDLINE_FORCE
 682         bool "Always use the default kernel command string"
 683         depends on CMDLINE_BOOL
 684         help
 685           Always use the default kernel command string, even if the boot
 686           loader passes other arguments to the kernel.
 687           This is useful if you cannot or don't want to change the
 688           command-line options your boot loader passes to the kernel.
 689
 690 config EXTRA_TARGETS
 691         string "Additional default image types"
 692         help
 693           List additional targets to be built by the bootwrapper here (separated
 694           by spaces).  This is useful for targets that depend of device tree
 695           files in the .dts directory.
 696
 697           Targets in this list will be build as part of the default build
 698           target, or when the user does a 'make zImage' or a
 699           'make zImage.initrd'.
 700
 701           If unsure, leave blank
 702
 703 config ARCH_WANTS_FREEZER_CONTROL
 704         def_bool y
 705         depends on ADB_PMU
 706
 707 source kernel/power/Kconfig
 708
 709 config SECCOMP
 710         bool "Enable seccomp to safely compute untrusted bytecode"
 711         depends on PROC_FS
 712         default y
 713         help
 714           This kernel feature is useful for number crunching applications
 715           that may need to compute untrusted bytecode during their
 716           execution. By using pipes or other transports made available to
 717           the process as file descriptors supporting the read/write
 718           syscalls, it's possible to isolate those applications in
 719           their own address space using seccomp. Once seccomp is
 720           enabled via /proc/<pid>/seccomp, it cannot be disabled
 721           and the task is only allowed to execute a few safe syscalls
 722           defined by each seccomp mode.
 723
 724           If unsure, say Y. Only embedded should say N here.
 725
 726 endmenu
 727
 728 config ISA_DMA_API
 729         bool
 730         default PCI
 731
 732 menu "Bus options"
 733
 734 config ISA
 735         bool "Support for ISA-bus hardware"
 736         depends on PPC_CHRP
 737         select PPC_I8259
 738         help
 739           Find out whether you have ISA slots on your motherboard.  ISA is the
 740           name of a bus system, i.e. the way the CPU talks to the other stuff
 741           inside your box.  If you have an Apple machine, say N here; if you
 742           have an IBM RS/6000 or pSeries machine, say Y.  If you have an
 743           embedded board, consult your board documentation.
 744
 745 config ZONE_DMA
 746         bool
 747         default y
 748
 749 config NEED_DMA_MAP_STATE
 750         def_bool (PPC64 || NOT_COHERENT_CACHE)
 751
 752 config NEED_SG_DMA_LENGTH
 753         def_bool y
 754
 755 config GENERIC_ISA_DMA
 756         bool
 757         depends on ISA_DMA_API
 758         default y
 759
 760 config PPC_INDIRECT_PCI
 761         bool
 762         depends on PCI
 763         default y if 40x || 44x
 764         default n
 765
 766 config EISA
 767         bool
 768
 769 config SBUS
 770         bool
 771
 772 config FSL_SOC
 773         bool
 774
 775 config FSL_PCI
 776         bool
 777         select PPC_INDIRECT_PCI
 778         select PCI_QUIRKS
 779
 780 config FSL_PMC
 781         bool
 782         default y
 783         depends on SUSPEND && (PPC_85xx || PPC_86xx)
 784         help
 785           Freescale MPC85xx/MPC86xx power management controller support
 786           (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
 787
 788 config PPC4xx_CPM
 789         bool
 790         default y
 791         depends on SUSPEND && (44x || 40x)
 792         help
 793           PPC4xx Clock Power Management (CPM) support (suspend/resume).
 794           It also enables support for two different idle states (idle-wait
 795           and idle-doze).
 796
 797 config 4xx_SOC
 798         bool
 799
 800 config FSL_LBC
 801         bool "Freescale Local Bus support"
 802         help
 803           Enables reporting of errors from the Freescale local bus
 804           controller.  Also contains some common code used by
 805           drivers for specific local bus peripherals.
 806
 807 config FSL_GTM
 808         bool
 809         depends on PPC_83xx || QUICC_ENGINE || CPM2
 810         help
 811           Freescale General-purpose Timers support
 812
 813 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
 814 config MCA
 815         bool
 816
 817 # Platforms that what PCI turned unconditionally just do select PCI
 818 # in their config node.  Platforms that want to choose at config
 819 # time should select PPC_PCI_CHOICE
 820 config PPC_PCI_CHOICE
 821         bool
 822
 823 config PCI
 824         bool "PCI support" if PPC_PCI_CHOICE
 825         default y if !40x && !CPM2 && !8xx && !PPC_83xx \
 826                 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
 827         default PCI_QSPAN if !4xx && !CPM2 && 8xx
 828         select GENERIC_PCI_IOMAP
 829         help
 830           Find out whether your system includes a PCI bus. PCI is the name of
 831           a bus system, i.e. the way the CPU talks to the other stuff inside
 832           your box.  If you say Y here, the kernel will include drivers and
 833           infrastructure code to support PCI bus devices.
 834
 835 config PCI_DOMAINS
 836         def_bool PCI
 837
 838 config PCI_SYSCALL
 839         def_bool PCI
 840
 841 config PCI_QSPAN
 842         bool "QSpan PCI"
 843         depends on !4xx && !CPM2 && 8xx
 844         select PPC_I8259
 845         help
 846           Say Y here if you have a system based on a Motorola 8xx-series
 847           embedded processor with a QSPAN PCI interface, otherwise say N.
 848
 849 config PCI_8260
 850         bool
 851         depends on PCI && 8260
 852         select PPC_INDIRECT_PCI
 853         default y
 854
 855 source "drivers/pci/Kconfig"
 856
 857 source "drivers/pcmcia/Kconfig"
 858
 859 config HAS_RAPIDIO
 860         bool
 861         default n
 862
 863 config RAPIDIO
 864         tristate "RapidIO support"
 865         depends on HAS_RAPIDIO || PCI
 866         help
 867           If you say Y here, the kernel will include drivers and
 868           infrastructure code to support RapidIO interconnect devices.
 869
 870 config FSL_RIO
 871         bool "Freescale Embedded SRIO Controller support"
 872         depends on RAPIDIO = y && HAS_RAPIDIO
 873         default "n"
 874         ---help---
 875           Include support for RapidIO controller on Freescale embedded
 876           processors (MPC8548, MPC8641, etc).
 877
 878 source "drivers/rapidio/Kconfig"
 879
 880 endmenu
 881
 882 config NONSTATIC_KERNEL
 883         bool
 884         default n
 885
 886 menu "Advanced setup"
 887         depends on PPC32
 888
 889 config ADVANCED_OPTIONS
 890         bool "Prompt for advanced kernel configuration options"
 891         help
 892           This option will enable prompting for a variety of advanced kernel
 893           configuration options.  These options can cause the kernel to not
 894           work if they are set incorrectly, but can be used to optimize certain
 895           aspects of kernel memory management.
 896
 897           Unless you know what you are doing, say N here.
 898
 899 comment "Default settings for advanced configuration options are used"
 900         depends on !ADVANCED_OPTIONS
 901
 902 config LOWMEM_SIZE_BOOL
 903         bool "Set maximum low memory"
 904         depends on ADVANCED_OPTIONS
 905         help
 906           This option allows you to set the maximum amount of memory which
 907           will be used as "low memory", that is, memory which the kernel can
 908           access directly, without having to set up a kernel virtual mapping.
 909           This can be useful in optimizing the layout of kernel virtual
 910           memory.
 911
 912           Say N here unless you know what you are doing.
 913
 914 config LOWMEM_SIZE
 915         hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
 916         default "0x30000000"
 917
 918 config LOWMEM_CAM_NUM_BOOL
 919         bool "Set number of CAMs to use to map low memory"
 920         depends on ADVANCED_OPTIONS && FSL_BOOKE
 921         help
 922           This option allows you to set the maximum number of CAM slots that
 923           will be used to map low memory.  There are a limited number of slots
 924           available and even more limited number that will fit in the L1 MMU.
 925           However, using more entries will allow mapping more low memory.  This
 926           can be useful in optimizing the layout of kernel virtual memory.
 927
 928           Say N here unless you know what you are doing.
 929
 930 config LOWMEM_CAM_NUM
 931         depends on FSL_BOOKE
 932         int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
 933         default 3
 934
 935 config DYNAMIC_MEMSTART
 936         bool "Enable page aligned dynamic load address for kernel"
 937         depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
 938         select NONSTATIC_KERNEL
 939         help
 940           This option enables the kernel to be loaded at any page aligned
 941           physical address. The kernel creates a mapping from KERNELBASE to
 942           the address where the kernel is loaded. The page size here implies
 943           the TLB page size of the mapping for kernel on the particular platform.
 944           Please refer to the init code for finding the TLB page size.
 945
 946           DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
 947           kernel image, where the only restriction is the page aligned kernel
 948           load address. When this option is enabled, the compile time physical
 949           address CONFIG_PHYSICAL_START is ignored.
 950
 951           This option is overridden by CONFIG_RELOCATABLE
 952
 953 config RELOCATABLE
 954         bool "Build a relocatable kernel"
 955         depends on ADVANCED_OPTIONS && FLATMEM && (44x || FSL_BOOKE)
 956         select NONSTATIC_KERNEL
 957         help
 958           This builds a kernel image that is capable of running at the
 959           location the kernel is loaded at, without any alignment restrictions.
 960           This feature is a superset of DYNAMIC_MEMSTART and hence overrides it.
 961
 962           One use is for the kexec on panic case where the recovery kernel
 963           must live at a different physical address than the primary
 964           kernel.
 965
 966           Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
 967           it has been loaded at and the compile time physical addresses
 968           CONFIG_PHYSICAL_START is ignored.  However CONFIG_PHYSICAL_START
 969           setting can still be useful to bootwrappers that need to know the
 970           load address of the kernel (eg. u-boot/mkimage).
 971
 972 config RELOCATABLE_PPC32
 973         def_bool y
 974         depends on PPC32 && RELOCATABLE
 975
 976 config PAGE_OFFSET_BOOL
 977         bool "Set custom page offset address"
 978         depends on ADVANCED_OPTIONS
 979         help
 980           This option allows you to set the kernel virtual address at which
 981           the kernel will map low memory.  This can be useful in optimizing
 982           the virtual memory layout of the system.
 983
 984           Say N here unless you know what you are doing.
 985
 986 config PAGE_OFFSET
 987         hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
 988         default "0xc0000000"
 989
 990 config KERNEL_START_BOOL
 991         bool "Set custom kernel base address"
 992         depends on ADVANCED_OPTIONS
 993         help
 994           This option allows you to set the kernel virtual address at which
 995           the kernel will be loaded.  Normally this should match PAGE_OFFSET
 996           however there are times (like kdump) that one might not want them
 997           to be the same.
 998
 999           Say N here unless you know what you are doing.
1000
1001 config KERNEL_START
1002         hex "Virtual address of kernel base" if KERNEL_START_BOOL
1003         default PAGE_OFFSET if PAGE_OFFSET_BOOL
1004         default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1005         default "0xc0000000"
1006
1007 config PHYSICAL_START_BOOL
1008         bool "Set physical address where the kernel is loaded"
1009         depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1010         help
1011           This gives the physical address where the kernel is loaded.
1012
1013           Say N here unless you know what you are doing.
1014
1015 config PHYSICAL_START
1016         hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1017         default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1018         default "0x00000000"
1019
1020 config PHYSICAL_ALIGN
1021         hex
1022         default "0x04000000" if FSL_BOOKE
1023         help
1024           This value puts the alignment restrictions on physical address
1025           where kernel is loaded and run from. Kernel is compiled for an
1026           address which meets above alignment restriction.
1027
1028 config TASK_SIZE_BOOL
1029         bool "Set custom user task size"
1030         depends on ADVANCED_OPTIONS
1031         help
1032           This option allows you to set the amount of virtual address space
1033           allocated to user tasks.  This can be useful in optimizing the
1034           virtual memory layout of the system.
1035
1036           Say N here unless you know what you are doing.
1037
1038 config TASK_SIZE
1039         hex "Size of user task space" if TASK_SIZE_BOOL
1040         default "0x80000000" if PPC_8xx
1041         default "0xc0000000"
1042
1043 config CONSISTENT_SIZE_BOOL
1044         bool "Set custom consistent memory pool size"
1045         depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1046         help
1047           This option allows you to set the size of the
1048           consistent memory pool.  This pool of virtual memory
1049           is used to make consistent memory allocations.
1050
1051 config CONSISTENT_SIZE
1052         hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1053         default "0x00200000" if NOT_COHERENT_CACHE
1054
1055 config PIN_TLB
1056         bool "Pinned Kernel TLBs (860 ONLY)"
1057         depends on ADVANCED_OPTIONS && 8xx
1058 endmenu
1059
1060 if PPC64
1061 config RELOCATABLE
1062         bool "Build a relocatable kernel"
1063         depends on !COMPILE_TEST
1064         select NONSTATIC_KERNEL
1065         help
1066           This builds a kernel image that is capable of running anywhere
1067           in the RMA (real memory area) at any 16k-aligned base address.
1068           The kernel is linked as a position-independent executable (PIE)
1069           and contains dynamic relocations which are processed early
1070           in the bootup process.
1071
1072           One use is for the kexec on panic case where the recovery kernel
1073           must live at a different physical address than the primary
1074           kernel.
1075
1076 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1077 config PAGE_OFFSET
1078         hex
1079         default "0xc000000000000000"
1080 config KERNEL_START
1081         hex
1082         default "0xc000000000000000"
1083 config PHYSICAL_START
1084         hex
1085         default "0x00000000"
1086 endif
1087
1088 config  ARCH_RANDOM
1089         def_bool n
1090
1091 source "net/Kconfig"
1092
1093 source "drivers/Kconfig"
1094
1095 source "fs/Kconfig"
1096
1097 source "lib/Kconfig"
1098
1099 source "arch/powerpc/Kconfig.debug"
1100
1101 source "security/Kconfig"
1102
1103 config KEYS_COMPAT
1104         bool
1105         depends on COMPAT && KEYS
1106         default y
1107
1108 source "crypto/Kconfig"
1109
1110 config PPC_LIB_RHEAP
1111         bool
1112
1113 source "arch/powerpc/kvm/Kconfig"
1114
1115 source "kernel/livepatch/Kconfig"