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 ARCH_PHYS_ADDR_T_64BIT
  16        def_bool PPC64 || PHYS_64BIT
  17
  18 config ARCH_DMA_ADDR_T_64BIT
  19         def_bool ARCH_PHYS_ADDR_T_64BIT
  20
  21 config MMU
  22         bool
  23         default y
  24
  25 config HAVE_SETUP_PER_CPU_AREA
  26         def_bool PPC64
  27
  28 config NEED_PER_CPU_EMBED_FIRST_CHUNK
  29         def_bool PPC64
  30
  31 config NR_IRQS
  32         int "Number of virtual interrupt numbers"
  33         range 32 32768
  34         default "512"
  35         help
  36           This defines the number of virtual interrupt numbers the kernel
  37           can manage. Virtual interrupt numbers are what you see in
  38           /proc/interrupts. If you configure your system to have too few,
  39           drivers will fail to load or worse - handle with care.
  40
  41 config STACKTRACE_SUPPORT
  42         bool
  43         default y
  44
  45 config TRACE_IRQFLAGS_SUPPORT
  46         bool
  47         default y
  48
  49 config LOCKDEP_SUPPORT
  50         bool
  51         default y
  52
  53 config RWSEM_GENERIC_SPINLOCK
  54         bool
  55
  56 config RWSEM_XCHGADD_ALGORITHM
  57         bool
  58         default y
  59
  60 config GENERIC_LOCKBREAK
  61         bool
  62         default y
  63         depends on SMP && PREEMPT
  64
  65 config ARCH_HAS_ILOG2_U32
  66         bool
  67         default y
  68
  69 config ARCH_HAS_ILOG2_U64
  70         bool
  71         default y if 64BIT
  72
  73 config GENERIC_HWEIGHT
  74         bool
  75         default y
  76
  77 config ARCH_HAS_DMA_SET_COHERENT_MASK
  78         bool
  79
  80 config PPC
  81         bool
  82         default y
  83         select BUILDTIME_EXTABLE_SORT
  84         select ARCH_MIGHT_HAVE_PC_PARPORT
  85         select ARCH_MIGHT_HAVE_PC_SERIO
  86         select BINFMT_ELF
  87         select ARCH_HAS_ELF_RANDOMIZE
  88         select OF
  89         select OF_EARLY_FLATTREE
  90         select OF_RESERVED_MEM
  91         select HAVE_FTRACE_MCOUNT_RECORD
  92         select HAVE_DYNAMIC_FTRACE
  93         select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
  94         select HAVE_FUNCTION_TRACER
  95         select HAVE_FUNCTION_GRAPH_TRACER
  96         select SYSCTL_EXCEPTION_TRACE
  97         select VIRT_TO_BUS if !PPC64
  98         select HAVE_IDE
  99         select HAVE_IOREMAP_PROT
 100         select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
 101         select HAVE_KPROBES
 102         select HAVE_ARCH_KGDB
 103         select HAVE_KRETPROBES
 104         select HAVE_ARCH_TRACEHOOK
 105         select HAVE_MEMBLOCK
 106         select HAVE_MEMBLOCK_NODE_MAP
 107         select HAVE_DMA_API_DEBUG
 108         select HAVE_OPROFILE
 109         select HAVE_DEBUG_KMEMLEAK
 110         select ARCH_HAS_SG_CHAIN
 111         select GENERIC_ATOMIC64 if PPC32
 112         select HAVE_PERF_EVENTS
 113         select HAVE_PERF_REGS
 114         select HAVE_PERF_USER_STACK_DUMP
 115         select HAVE_REGS_AND_STACK_ACCESS_API
 116         select HAVE_HW_BREAKPOINT if PERF_EVENTS && PPC_BOOK3S_64
 117         select ARCH_WANT_IPC_PARSE_VERSION
 118         select SPARSE_IRQ
 119         select IRQ_DOMAIN
 120         select GENERIC_IRQ_SHOW
 121         select GENERIC_IRQ_SHOW_LEVEL
 122         select IRQ_FORCED_THREADING
 123         select HAVE_RCU_TABLE_FREE if SMP
 124         select HAVE_SYSCALL_TRACEPOINTS
 125         select HAVE_CBPF_JIT if !PPC64
 126         select HAVE_EBPF_JIT if PPC64
 127         select HAVE_ARCH_JUMP_LABEL
 128         select ARCH_HAVE_NMI_SAFE_CMPXCHG
 129         select ARCH_HAS_GCOV_PROFILE_ALL
 130         select GENERIC_SMP_IDLE_THREAD
 131         select GENERIC_CMOS_UPDATE
 132         select GENERIC_TIME_VSYSCALL_OLD
 133         select GENERIC_CLOCKEVENTS
 134         select GENERIC_CLOCKEVENTS_BROADCAST if SMP
 135         select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
 136         select GENERIC_STRNCPY_FROM_USER
 137         select GENERIC_STRNLEN_USER
 138         select HAVE_MOD_ARCH_SPECIFIC
 139         select MODULES_USE_ELF_RELA
 140         select CLONE_BACKWARDS
 141         select ARCH_USE_BUILTIN_BSWAP
 142         select OLD_SIGSUSPEND
 143         select OLD_SIGACTION if PPC32
 144         select HAVE_DEBUG_STACKOVERFLOW
 145         select HAVE_IRQ_EXIT_ON_IRQ_STACK
 146         select ARCH_USE_CMPXCHG_LOCKREF if PPC64
 147         select HAVE_ARCH_AUDITSYSCALL
 148         select ARCH_SUPPORTS_ATOMIC_RMW
 149         select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
 150         select NO_BOOTMEM
 151         select HAVE_GENERIC_RCU_GUP
 152         select HAVE_PERF_EVENTS_NMI if PPC64
 153         select HAVE_NMI if PERF_EVENTS
 154         select EDAC_SUPPORT
 155         select EDAC_ATOMIC_SCRUB
 156         select ARCH_HAS_DMA_SET_COHERENT_MASK
 157         select ARCH_HAS_DEVMEM_IS_ALLOWED
 158         select HAVE_ARCH_SECCOMP_FILTER
 159         select ARCH_HAS_UBSAN_SANITIZE_ALL
 160         select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
 161         select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
 162         select GENERIC_CPU_AUTOPROBE
 163         select HAVE_VIRT_CPU_ACCOUNTING
 164         select HAVE_ARCH_HARDENED_USERCOPY
 165         select HAVE_KERNEL_GZIP
 166         select HAVE_CC_STACKPROTECTOR
 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 USE_THIN_ARCHIVES
 401         bool "Build the kernel using thin archives"
 402         default n
 403         select THIN_ARCHIVES
 404         help
 405           Build the kernel using thin archives.
 406           If you're unsure say N.
 407
 408 config IOMMU_HELPER
 409         def_bool PPC64
 410
 411 config SWIOTLB
 412         bool "SWIOTLB support"
 413         default n
 414         select IOMMU_HELPER
 415         ---help---
 416           Support for IO bounce buffering for systems without an IOMMU.
 417           This allows us to DMA to the full physical address space on
 418           platforms where the size of a physical address is larger
 419           than the bus address.  Not all platforms support this.
 420
 421 config HOTPLUG_CPU
 422         bool "Support for enabling/disabling CPUs"
 423         depends on SMP && (PPC_PSERIES || \
 424         PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
 425         ---help---
 426           Say Y here to be able to disable and re-enable individual
 427           CPUs at runtime on SMP machines.
 428
 429           Say N if you are unsure.
 430
 431 config ARCH_CPU_PROBE_RELEASE
 432         def_bool y
 433         depends on HOTPLUG_CPU
 434
 435 config ARCH_ENABLE_MEMORY_HOTPLUG
 436         def_bool y
 437
 438 config ARCH_HAS_WALK_MEMORY
 439         def_bool y
 440
 441 config ARCH_ENABLE_MEMORY_HOTREMOVE
 442         def_bool y
 443
 444 config PPC64_SUPPORTS_MEMORY_FAILURE
 445         bool "Add support for memory hwpoison"
 446         depends on PPC_BOOK3S_64
 447         default "y" if PPC_POWERNV
 448         select ARCH_SUPPORTS_MEMORY_FAILURE
 449
 450 config KEXEC
 451         bool "kexec system call"
 452         depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
 453         select KEXEC_CORE
 454         help
 455           kexec is a system call that implements the ability to shutdown your
 456           current kernel, and to start another kernel.  It is like a reboot
 457           but it is independent of the system firmware.   And like a reboot
 458           you can start any kernel with it, not just Linux.
 459
 460           The name comes from the similarity to the exec system call.
 461
 462           It is an ongoing process to be certain the hardware in a machine
 463           is properly shutdown, so do not be surprised if this code does not
 464           initially work for you.  As of this writing the exact hardware
 465           interface is strongly in flux, so no good recommendation can be
 466           made.
 467
 468 config KEXEC_FILE
 469         bool "kexec file based system call"
 470         select KEXEC_CORE
 471         select BUILD_BIN2C
 472         depends on PPC64
 473         depends on CRYPTO=y
 474         depends on CRYPTO_SHA256=y
 475         help
 476           This is a new version of the kexec system call. This call is
 477           file based and takes in file descriptors as system call arguments
 478           for kernel and initramfs as opposed to a list of segments as is the
 479           case for the older kexec call.
 480
 481 config RELOCATABLE
 482         bool "Build a relocatable kernel"
 483         depends on (PPC64 && !COMPILE_TEST) || (FLATMEM && (44x || FSL_BOOKE))
 484         select NONSTATIC_KERNEL
 485         help
 486           This builds a kernel image that is capable of running at the
 487           location the kernel is loaded at. For ppc32, there is no any
 488           alignment restrictions, and this feature is a superset of
 489           DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
 490           16k-aligned base address. The kernel is linked as a
 491           position-independent executable (PIE) and contains dynamic relocations
 492           which are processed early in the bootup process.
 493
 494           One use is for the kexec on panic case where the recovery kernel
 495           must live at a different physical address than the primary
 496           kernel.
 497
 498           Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
 499           it has been loaded at and the compile time physical addresses
 500           CONFIG_PHYSICAL_START is ignored.  However CONFIG_PHYSICAL_START
 501           setting can still be useful to bootwrappers that need to know the
 502           load address of the kernel (eg. u-boot/mkimage).
 503
 504 config RELOCATABLE_TEST
 505         bool "Test relocatable kernel"
 506         depends on (PPC64 && RELOCATABLE)
 507         default n
 508         help
 509           This runs the relocatable kernel at the address it was initially
 510           loaded at, which tends to be non-zero and therefore test the
 511           relocation code.
 512
 513 config CRASH_DUMP
 514         bool "Build a kdump crash kernel"
 515         depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
 516         select RELOCATABLE if (PPC64 && !COMPILE_TEST) || 44x || FSL_BOOKE
 517         help
 518           Build a kernel suitable for use as a kdump capture kernel.
 519           The same kernel binary can be used as production kernel and dump
 520           capture kernel.
 521
 522 config FA_DUMP
 523         bool "Firmware-assisted dump"
 524         depends on PPC64 && PPC_RTAS && CRASH_DUMP && KEXEC_CORE
 525         help
 526           A robust mechanism to get reliable kernel crash dump with
 527           assistance from firmware. This approach does not use kexec,
 528           instead firmware assists in booting the kdump kernel
 529           while preserving memory contents. Firmware-assisted dump
 530           is meant to be a kdump replacement offering robustness and
 531           speed not possible without system firmware assistance.
 532
 533           If unsure, say "N"
 534
 535 config IRQ_ALL_CPUS
 536         bool "Distribute interrupts on all CPUs by default"
 537         depends on SMP
 538         help
 539           This option gives the kernel permission to distribute IRQs across
 540           multiple CPUs.  Saying N here will route all IRQs to the first
 541           CPU.  Generally saying Y is safe, although some problems have been
 542           reported with SMP Power Macintoshes with this option enabled.
 543
 544 config NUMA
 545         bool "NUMA support"
 546         depends on PPC64
 547         default y if SMP && PPC_PSERIES
 548
 549 config NODES_SHIFT
 550         int
 551         default "8" if PPC64
 552         default "4"
 553         depends on NEED_MULTIPLE_NODES
 554
 555 config USE_PERCPU_NUMA_NODE_ID
 556         def_bool y
 557         depends on NUMA
 558
 559 config HAVE_MEMORYLESS_NODES
 560         def_bool y
 561         depends on NUMA
 562
 563 config ARCH_SELECT_MEMORY_MODEL
 564         def_bool y
 565         depends on PPC64
 566
 567 config ARCH_FLATMEM_ENABLE
 568         def_bool y
 569         depends on (PPC64 && !NUMA) || PPC32
 570
 571 config ARCH_SPARSEMEM_ENABLE
 572         def_bool y
 573         depends on PPC64
 574         select SPARSEMEM_VMEMMAP_ENABLE
 575
 576 config ARCH_SPARSEMEM_DEFAULT
 577         def_bool y
 578         depends on (SMP && PPC_PSERIES) || PPC_PS3
 579
 580 config SYS_SUPPORTS_HUGETLBFS
 581         bool
 582
 583 config ILLEGAL_POINTER_VALUE
 584         hex
 585         # This is roughly half way between the top of user space and the bottom
 586         # of kernel space, which seems about as good as we can get.
 587         default 0x5deadbeef0000000 if PPC64
 588         default 0
 589
 590 source "mm/Kconfig"
 591
 592 config ARCH_MEMORY_PROBE
 593         def_bool y
 594         depends on MEMORY_HOTPLUG
 595
 596 # Some NUMA nodes have memory ranges that span
 597 # other nodes.  Even though a pfn is valid and
 598 # between a node's start and end pfns, it may not
 599 # reside on that node.  See memmap_init_zone()
 600 # for details.
 601 config NODES_SPAN_OTHER_NODES
 602         def_bool y
 603         depends on NEED_MULTIPLE_NODES
 604
 605 config STDBINUTILS
 606         bool "Using standard binutils settings"
 607         depends on 44x
 608         default y
 609         help
 610           Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
 611           Note, that kernel will be able to run only those applications,
 612           which had been compiled using binutils later than 2.17.50.0.3 with
 613           '-zmax-page-size' set to 256K (the default is 64K). Or, if using
 614           the older binutils, you can patch them with a trivial patch, which
 615           changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
 616
 617 choice
 618         prompt "Page size"
 619         default PPC_4K_PAGES
 620         help
 621           Select the kernel logical page size. Increasing the page size
 622           will reduce software overhead at each page boundary, allow
 623           hardware prefetch mechanisms to be more effective, and allow
 624           larger dma transfers increasing IO efficiency and reducing
 625           overhead. However the utilization of memory will increase.
 626           For example, each cached file will using a multiple of the
 627           page size to hold its contents and the difference between the
 628           end of file and the end of page is wasted.
 629
 630           Some dedicated systems, such as software raid serving with
 631           accelerated calculations, have shown significant increases.
 632
 633           If you configure a 64 bit kernel for 64k pages but the
 634           processor does not support them, then the kernel will simulate
 635           them with 4k pages, loading them on demand, but with the
 636           reduced software overhead and larger internal fragmentation.
 637           For the 32 bit kernel, a large page option will not be offered
 638           unless it is supported by the configured processor.
 639
 640           If unsure, choose 4K_PAGES.
 641
 642 config PPC_4K_PAGES
 643         bool "4k page size"
 644         select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
 645
 646 config PPC_16K_PAGES
 647         bool "16k page size"
 648         depends on 44x || PPC_8xx
 649
 650 config PPC_64K_PAGES
 651         bool "64k page size"
 652         depends on !PPC_FSL_BOOK3E && (44x || PPC_STD_MMU_64 || PPC_BOOK3E_64)
 653         select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
 654
 655 config PPC_256K_PAGES
 656         bool "256k page size"
 657         depends on 44x && !STDBINUTILS
 658         help
 659           Make the page size 256k.
 660
 661           As the ELF standard only requires alignment to support page
 662           sizes up to 64k, you will need to compile all of your user
 663           space applications with a non-standard binutils settings
 664           (see the STDBINUTILS description for details).
 665
 666           Say N unless you know what you are doing.
 667
 668 endchoice
 669
 670 config FORCE_MAX_ZONEORDER
 671         int "Maximum zone order"
 672         range 8 9 if PPC64 && PPC_64K_PAGES
 673         default "9" if PPC64 && PPC_64K_PAGES
 674         range 13 13 if PPC64 && !PPC_64K_PAGES
 675         default "13" if PPC64 && !PPC_64K_PAGES
 676         range 9 64 if PPC32 && PPC_16K_PAGES
 677         default "9" if PPC32 && PPC_16K_PAGES
 678         range 7 64 if PPC32 && PPC_64K_PAGES
 679         default "7" if PPC32 && PPC_64K_PAGES
 680         range 5 64 if PPC32 && PPC_256K_PAGES
 681         default "5" if PPC32 && PPC_256K_PAGES
 682         range 11 64
 683         default "11"
 684         help
 685           The kernel memory allocator divides physically contiguous memory
 686           blocks into "zones", where each zone is a power of two number of
 687           pages.  This option selects the largest power of two that the kernel
 688           keeps in the memory allocator.  If you need to allocate very large
 689           blocks of physically contiguous memory, then you may need to
 690           increase this value.
 691
 692           This config option is actually maximum order plus one. For example,
 693           a value of 11 means that the largest free memory block is 2^10 pages.
 694
 695           The page size is not necessarily 4KB.  For example, on 64-bit
 696           systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES.  Keep
 697           this in mind when choosing a value for this option.
 698
 699 config PPC_SUBPAGE_PROT
 700         bool "Support setting protections for 4k subpages"
 701         depends on PPC_STD_MMU_64 && PPC_64K_PAGES
 702         help
 703           This option adds support for a system call to allow user programs
 704           to set access permissions (read/write, readonly, or no access)
 705           on the 4k subpages of each 64k page.
 706
 707 config PPC_COPRO_BASE
 708         bool
 709         default n
 710
 711 config SCHED_SMT
 712         bool "SMT (Hyperthreading) scheduler support"
 713         depends on PPC64 && SMP
 714         help
 715           SMT scheduler support improves the CPU scheduler's decision making
 716           when dealing with POWER5 cpus at a cost of slightly increased
 717           overhead in some places. If unsure say N here.
 718
 719 config PPC_DENORMALISATION
 720         bool "PowerPC denormalisation exception handling"
 721         depends on PPC_BOOK3S_64
 722         default "y" if PPC_POWERNV
 723         ---help---
 724           Add support for handling denormalisation of single precision
 725           values.  Useful for bare metal only.  If unsure say Y here.
 726
 727 config CMDLINE_BOOL
 728         bool "Default bootloader kernel arguments"
 729
 730 config CMDLINE
 731         string "Initial kernel command string"
 732         depends on CMDLINE_BOOL
 733         default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
 734         help
 735           On some platforms, there is currently no way for the boot loader to
 736           pass arguments to the kernel. For these platforms, you can supply
 737           some command-line options at build time by entering them here.  In
 738           most cases you will need to specify the root device here.
 739
 740 config CMDLINE_FORCE
 741         bool "Always use the default kernel command string"
 742         depends on CMDLINE_BOOL
 743         help
 744           Always use the default kernel command string, even if the boot
 745           loader passes other arguments to the kernel.
 746           This is useful if you cannot or don't want to change the
 747           command-line options your boot loader passes to the kernel.
 748
 749 config EXTRA_TARGETS
 750         string "Additional default image types"
 751         help
 752           List additional targets to be built by the bootwrapper here (separated
 753           by spaces).  This is useful for targets that depend of device tree
 754           files in the .dts directory.
 755
 756           Targets in this list will be build as part of the default build
 757           target, or when the user does a 'make zImage' or a
 758           'make zImage.initrd'.
 759
 760           If unsure, leave blank
 761
 762 config ARCH_WANTS_FREEZER_CONTROL
 763         def_bool y
 764         depends on ADB_PMU
 765
 766 source kernel/power/Kconfig
 767
 768 config SECCOMP
 769         bool "Enable seccomp to safely compute untrusted bytecode"
 770         depends on PROC_FS
 771         default y
 772         help
 773           This kernel feature is useful for number crunching applications
 774           that may need to compute untrusted bytecode during their
 775           execution. By using pipes or other transports made available to
 776           the process as file descriptors supporting the read/write
 777           syscalls, it's possible to isolate those applications in
 778           their own address space using seccomp. Once seccomp is
 779           enabled via /proc/<pid>/seccomp, it cannot be disabled
 780           and the task is only allowed to execute a few safe syscalls
 781           defined by each seccomp mode.
 782
 783           If unsure, say Y. Only embedded should say N here.
 784
 785 endmenu
 786
 787 config ISA_DMA_API
 788         bool
 789         default PCI
 790
 791 menu "Bus options"
 792
 793 config ISA
 794         bool "Support for ISA-bus hardware"
 795         depends on PPC_CHRP
 796         select PPC_I8259
 797         help
 798           Find out whether you have ISA slots on your motherboard.  ISA is the
 799           name of a bus system, i.e. the way the CPU talks to the other stuff
 800           inside your box.  If you have an Apple machine, say N here; if you
 801           have an IBM RS/6000 or pSeries machine, say Y.  If you have an
 802           embedded board, consult your board documentation.
 803
 804 config ZONE_DMA
 805         bool
 806         default y
 807
 808 config NEED_DMA_MAP_STATE
 809         def_bool (PPC64 || NOT_COHERENT_CACHE)
 810
 811 config NEED_SG_DMA_LENGTH
 812         def_bool y
 813
 814 config GENERIC_ISA_DMA
 815         bool
 816         depends on ISA_DMA_API
 817         default y
 818
 819 config PPC_INDIRECT_PCI
 820         bool
 821         depends on PCI
 822         default y if 40x || 44x
 823         default n
 824
 825 config EISA
 826         bool
 827
 828 config SBUS
 829         bool
 830
 831 config FSL_SOC
 832         bool
 833
 834 config FSL_PCI
 835         bool
 836         select PPC_INDIRECT_PCI
 837         select PCI_QUIRKS
 838
 839 config FSL_PMC
 840         bool
 841         default y
 842         depends on SUSPEND && (PPC_85xx || PPC_86xx)
 843         help
 844           Freescale MPC85xx/MPC86xx power management controller support
 845           (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
 846
 847 config PPC4xx_CPM
 848         bool
 849         default y
 850         depends on SUSPEND && (44x || 40x)
 851         help
 852           PPC4xx Clock Power Management (CPM) support (suspend/resume).
 853           It also enables support for two different idle states (idle-wait
 854           and idle-doze).
 855
 856 config 4xx_SOC
 857         bool
 858
 859 config FSL_LBC
 860         bool "Freescale Local Bus support"
 861         help
 862           Enables reporting of errors from the Freescale local bus
 863           controller.  Also contains some common code used by
 864           drivers for specific local bus peripherals.
 865
 866 config FSL_GTM
 867         bool
 868         depends on PPC_83xx || QUICC_ENGINE || CPM2
 869         help
 870           Freescale General-purpose Timers support
 871
 872 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
 873 config MCA
 874         bool
 875
 876 # Platforms that what PCI turned unconditionally just do select PCI
 877 # in their config node.  Platforms that want to choose at config
 878 # time should select PPC_PCI_CHOICE
 879 config PPC_PCI_CHOICE
 880         bool
 881
 882 config PCI
 883         bool "PCI support" if PPC_PCI_CHOICE
 884         default y if !40x && !CPM2 && !8xx && !PPC_83xx \
 885                 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
 886         default PCI_QSPAN if !4xx && !CPM2 && 8xx
 887         select GENERIC_PCI_IOMAP
 888         help
 889           Find out whether your system includes a PCI bus. PCI is the name of
 890           a bus system, i.e. the way the CPU talks to the other stuff inside
 891           your box.  If you say Y here, the kernel will include drivers and
 892           infrastructure code to support PCI bus devices.
 893
 894 config PCI_DOMAINS
 895         def_bool PCI
 896
 897 config PCI_SYSCALL
 898         def_bool PCI
 899
 900 config PCI_QSPAN
 901         bool "QSpan PCI"
 902         depends on !4xx && !CPM2 && 8xx
 903         select PPC_I8259
 904         help
 905           Say Y here if you have a system based on a Motorola 8xx-series
 906           embedded processor with a QSPAN PCI interface, otherwise say N.
 907
 908 config PCI_8260
 909         bool
 910         depends on PCI && 8260
 911         select PPC_INDIRECT_PCI
 912         default y
 913
 914 source "drivers/pci/Kconfig"
 915
 916 source "drivers/pcmcia/Kconfig"
 917
 918 config HAS_RAPIDIO
 919         bool
 920         default n
 921
 922 config RAPIDIO
 923         tristate "RapidIO support"
 924         depends on HAS_RAPIDIO || PCI
 925         help
 926           If you say Y here, the kernel will include drivers and
 927           infrastructure code to support RapidIO interconnect devices.
 928
 929 config FSL_RIO
 930         bool "Freescale Embedded SRIO Controller support"
 931         depends on RAPIDIO = y && HAS_RAPIDIO
 932         default "n"
 933         ---help---
 934           Include support for RapidIO controller on Freescale embedded
 935           processors (MPC8548, MPC8641, etc).
 936
 937 source "drivers/rapidio/Kconfig"
 938
 939 endmenu
 940
 941 config NONSTATIC_KERNEL
 942         bool
 943         default n
 944
 945 menu "Advanced setup"
 946         depends on PPC32
 947
 948 config ADVANCED_OPTIONS
 949         bool "Prompt for advanced kernel configuration options"
 950         help
 951           This option will enable prompting for a variety of advanced kernel
 952           configuration options.  These options can cause the kernel to not
 953           work if they are set incorrectly, but can be used to optimize certain
 954           aspects of kernel memory management.
 955
 956           Unless you know what you are doing, say N here.
 957
 958 comment "Default settings for advanced configuration options are used"
 959         depends on !ADVANCED_OPTIONS
 960
 961 config LOWMEM_SIZE_BOOL
 962         bool "Set maximum low memory"
 963         depends on ADVANCED_OPTIONS
 964         help
 965           This option allows you to set the maximum amount of memory which
 966           will be used as "low memory", that is, memory which the kernel can
 967           access directly, without having to set up a kernel virtual mapping.
 968           This can be useful in optimizing the layout of kernel virtual
 969           memory.
 970
 971           Say N here unless you know what you are doing.
 972
 973 config LOWMEM_SIZE
 974         hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
 975         default "0x30000000"
 976
 977 config LOWMEM_CAM_NUM_BOOL
 978         bool "Set number of CAMs to use to map low memory"
 979         depends on ADVANCED_OPTIONS && FSL_BOOKE
 980         help
 981           This option allows you to set the maximum number of CAM slots that
 982           will be used to map low memory.  There are a limited number of slots
 983           available and even more limited number that will fit in the L1 MMU.
 984           However, using more entries will allow mapping more low memory.  This
 985           can be useful in optimizing the layout of kernel virtual memory.
 986
 987           Say N here unless you know what you are doing.
 988
 989 config LOWMEM_CAM_NUM
 990         depends on FSL_BOOKE
 991         int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
 992         default 3
 993
 994 config DYNAMIC_MEMSTART
 995         bool "Enable page aligned dynamic load address for kernel"
 996         depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
 997         select NONSTATIC_KERNEL
 998         help
 999           This option enables the kernel to be loaded at any page aligned
1000           physical address. The kernel creates a mapping from KERNELBASE to
1001           the address where the kernel is loaded. The page size here implies
1002           the TLB page size of the mapping for kernel on the particular platform.
1003           Please refer to the init code for finding the TLB page size.
1004
1005           DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1006           kernel image, where the only restriction is the page aligned kernel
1007           load address. When this option is enabled, the compile time physical
1008           address CONFIG_PHYSICAL_START is ignored.
1009
1010           This option is overridden by CONFIG_RELOCATABLE
1011
1012 config PAGE_OFFSET_BOOL
1013         bool "Set custom page offset address"
1014         depends on ADVANCED_OPTIONS
1015         help
1016           This option allows you to set the kernel virtual address at which
1017           the kernel will map low memory.  This can be useful in optimizing
1018           the virtual memory layout of the system.
1019
1020           Say N here unless you know what you are doing.
1021
1022 config PAGE_OFFSET
1023         hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1024         default "0xc0000000"
1025
1026 config KERNEL_START_BOOL
1027         bool "Set custom kernel base address"
1028         depends on ADVANCED_OPTIONS
1029         help
1030           This option allows you to set the kernel virtual address at which
1031           the kernel will be loaded.  Normally this should match PAGE_OFFSET
1032           however there are times (like kdump) that one might not want them
1033           to be the same.
1034
1035           Say N here unless you know what you are doing.
1036
1037 config KERNEL_START
1038         hex "Virtual address of kernel base" if KERNEL_START_BOOL
1039         default PAGE_OFFSET if PAGE_OFFSET_BOOL
1040         default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1041         default "0xc0000000"
1042
1043 config PHYSICAL_START_BOOL
1044         bool "Set physical address where the kernel is loaded"
1045         depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1046         help
1047           This gives the physical address where the kernel is loaded.
1048
1049           Say N here unless you know what you are doing.
1050
1051 config PHYSICAL_START
1052         hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1053         default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1054         default "0x00000000"
1055
1056 config PHYSICAL_ALIGN
1057         hex
1058         default "0x04000000" if FSL_BOOKE
1059         help
1060           This value puts the alignment restrictions on physical address
1061           where kernel is loaded and run from. Kernel is compiled for an
1062           address which meets above alignment restriction.
1063
1064 config TASK_SIZE_BOOL
1065         bool "Set custom user task size"
1066         depends on ADVANCED_OPTIONS
1067         help
1068           This option allows you to set the amount of virtual address space
1069           allocated to user tasks.  This can be useful in optimizing the
1070           virtual memory layout of the system.
1071
1072           Say N here unless you know what you are doing.
1073
1074 config TASK_SIZE
1075         hex "Size of user task space" if TASK_SIZE_BOOL
1076         default "0x80000000" if PPC_8xx
1077         default "0xc0000000"
1078
1079 config CONSISTENT_SIZE_BOOL
1080         bool "Set custom consistent memory pool size"
1081         depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1082         help
1083           This option allows you to set the size of the
1084           consistent memory pool.  This pool of virtual memory
1085           is used to make consistent memory allocations.
1086
1087 config CONSISTENT_SIZE
1088         hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1089         default "0x00200000" if NOT_COHERENT_CACHE
1090
1091 config PIN_TLB
1092         bool "Pinned Kernel TLBs (860 ONLY)"
1093         depends on ADVANCED_OPTIONS && 8xx
1094
1095 config PIN_TLB_IMMR
1096         bool "Pinned TLB for IMMR"
1097         depends on PIN_TLB
1098         default y
1099 endmenu
1100
1101 if PPC64
1102 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1103 config PAGE_OFFSET
1104         hex
1105         default "0xc000000000000000"
1106 config KERNEL_START
1107         hex
1108         default "0xc000000000000000"
1109 config PHYSICAL_START
1110         hex
1111         default "0x00000000"
1112 endif
1113
1114 config  ARCH_RANDOM
1115         def_bool n
1116
1117 source "net/Kconfig"
1118
1119 source "drivers/Kconfig"
1120
1121 source "fs/Kconfig"
1122
1123 source "lib/Kconfig"
1124
1125 source "arch/powerpc/Kconfig.debug"
1126
1127 source "security/Kconfig"
1128
1129 config KEYS_COMPAT
1130         bool
1131         depends on COMPAT && KEYS
1132         default y
1133
1134 source "crypto/Kconfig"
1135
1136 config PPC_LIB_RHEAP
1137         bool
1138
1139 source "arch/powerpc/kvm/Kconfig"
1140
1141 source "kernel/livepatch/Kconfig"