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 ARCH_MMAP_RND_BITS_MAX
  26         # On Book3S 64, the default virtual address space for 64-bit processes
  27         # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
  28         # 32T of address space (2^45), which should ensure a reasonable gap
  29         # between bottom-up and top-down allocations for applications that
  30         # consume "normal" amounts of address space. Book3S 64 only supports 64K
  31         # and 4K page sizes.
  32         default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
  33         default 33 if PPC_BOOK3S_64                  # 33 = 45 (32T) - 12 (4K)
  34         #
  35         # On all other 64-bit platforms (currently only Book3E), the virtual
  36         # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
  37         # of address space (2^44). Only 4K page sizes are supported.
  38         default 32 if 64BIT     # 32 = 44 (16T) - 12 (4K)
  39         #
  40         # For 32-bit, use the compat values, as they're the same.
  41         default ARCH_MMAP_RND_COMPAT_BITS_MAX
  42
  43 config ARCH_MMAP_RND_BITS_MIN
  44         # Allow randomisation to consume up to 1GB of address space (2^30).
  45         default 14 if 64BIT && PPC_64K_PAGES    # 14 = 30 (1GB) - 16 (64K)
  46         default 18 if 64BIT                     # 18 = 30 (1GB) - 12 (4K)
  47         #
  48         # For 32-bit, use the compat values, as they're the same.
  49         default ARCH_MMAP_RND_COMPAT_BITS_MIN
  50
  51 config ARCH_MMAP_RND_COMPAT_BITS_MAX
  52         # Total virtual address space for 32-bit processes is 2^31 (2GB).
  53         # Allow randomisation to consume up to 512MB of address space (2^29).
  54         default 11 if PPC_256K_PAGES    # 11 = 29 (512MB) - 18 (256K)
  55         default 13 if PPC_64K_PAGES     # 13 = 29 (512MB) - 16 (64K)
  56         default 15 if PPC_16K_PAGES     # 15 = 29 (512MB) - 14 (16K)
  57         default 17                      # 17 = 29 (512MB) - 12 (4K)
  58
  59 config ARCH_MMAP_RND_COMPAT_BITS_MIN
  60         # Total virtual address space for 32-bit processes is 2^31 (2GB).
  61         # Allow randomisation to consume up to 8MB of address space (2^23).
  62         default 5 if PPC_256K_PAGES     #  5 = 23 (8MB) - 18 (256K)
  63         default 7 if PPC_64K_PAGES      #  7 = 23 (8MB) - 16 (64K)
  64         default 9 if PPC_16K_PAGES      #  9 = 23 (8MB) - 14 (16K)
  65         default 11                      # 11 = 23 (8MB) - 12 (4K)
  66
  67 config HAVE_SETUP_PER_CPU_AREA
  68         def_bool PPC64
  69
  70 config NEED_PER_CPU_EMBED_FIRST_CHUNK
  71         def_bool PPC64
  72
  73 config NR_IRQS
  74         int "Number of virtual interrupt numbers"
  75         range 32 32768
  76         default "512"
  77         help
  78           This defines the number of virtual interrupt numbers the kernel
  79           can manage. Virtual interrupt numbers are what you see in
  80           /proc/interrupts. If you configure your system to have too few,
  81           drivers will fail to load or worse - handle with care.
  82
  83 config NMI_IPI
  84         bool
  85         depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
  86         default y
  87
  88 config STACKTRACE_SUPPORT
  89         bool
  90         default y
  91
  92 config TRACE_IRQFLAGS_SUPPORT
  93         bool
  94         default y
  95
  96 config LOCKDEP_SUPPORT
  97         bool
  98         default y
  99
 100 config RWSEM_GENERIC_SPINLOCK
 101         bool
 102
 103 config RWSEM_XCHGADD_ALGORITHM
 104         bool
 105         default y
 106
 107 config GENERIC_LOCKBREAK
 108         bool
 109         default y
 110         depends on SMP && PREEMPT
 111
 112 config GENERIC_HWEIGHT
 113         bool
 114         default y
 115
 116 config ARCH_HAS_DMA_SET_COHERENT_MASK
 117         bool
 118
 119 config PPC
 120         bool
 121         default y
 122         #
 123         # Please keep this list sorted alphabetically.
 124         #
 125         select ARCH_HAS_DEVMEM_IS_ALLOWED
 126         select ARCH_HAS_DMA_SET_COHERENT_MASK
 127         select ARCH_HAS_ELF_RANDOMIZE
 128         select ARCH_HAS_FORTIFY_SOURCE
 129         select ARCH_HAS_GCOV_PROFILE_ALL
 130         select ARCH_HAS_SCALED_CPUTIME          if VIRT_CPU_ACCOUNTING_NATIVE
 131         select ARCH_HAS_SG_CHAIN
 132         select ARCH_HAS_TICK_BROADCAST          if GENERIC_CLOCKEVENTS_BROADCAST
 133         select ARCH_HAS_UBSAN_SANITIZE_ALL
 134         select ARCH_HAS_ZONE_DEVICE             if PPC_BOOK3S_64
 135         select ARCH_HAVE_NMI_SAFE_CMPXCHG
 136         select ARCH_MIGHT_HAVE_PC_PARPORT
 137         select ARCH_MIGHT_HAVE_PC_SERIO
 138         select ARCH_SUPPORTS_ATOMIC_RMW
 139         select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
 140         select ARCH_USE_BUILTIN_BSWAP
 141         select ARCH_USE_CMPXCHG_LOCKREF         if PPC64
 142         select ARCH_WANT_IPC_PARSE_VERSION
 143         select ARCH_WEAK_RELEASE_ACQUIRE
 144         select BINFMT_ELF
 145         select BUILDTIME_EXTABLE_SORT
 146         select CLONE_BACKWARDS
 147         select DCACHE_WORD_ACCESS               if PPC64 && CPU_LITTLE_ENDIAN
 148         select EDAC_ATOMIC_SCRUB
 149         select EDAC_SUPPORT
 150         select GENERIC_ATOMIC64                 if PPC32
 151         select GENERIC_CLOCKEVENTS
 152         select GENERIC_CLOCKEVENTS_BROADCAST    if SMP
 153         select GENERIC_CMOS_UPDATE
 154         select GENERIC_CPU_AUTOPROBE
 155         select GENERIC_IRQ_SHOW
 156         select GENERIC_IRQ_SHOW_LEVEL
 157         select GENERIC_SMP_IDLE_THREAD
 158         select GENERIC_STRNCPY_FROM_USER
 159         select GENERIC_STRNLEN_USER
 160         select GENERIC_TIME_VSYSCALL
 161         select HAVE_ARCH_AUDITSYSCALL
 162         select HAVE_ARCH_JUMP_LABEL
 163         select HAVE_ARCH_KGDB
 164         select HAVE_ARCH_MMAP_RND_BITS
 165         select HAVE_ARCH_MMAP_RND_COMPAT_BITS   if COMPAT
 166         select HAVE_ARCH_SECCOMP_FILTER
 167         select HAVE_ARCH_TRACEHOOK
 168         select ARCH_HAS_STRICT_KERNEL_RWX       if (PPC_BOOK3S_64 && !RELOCATABLE && !HIBERNATION)
 169         select ARCH_OPTIONAL_KERNEL_RWX         if ARCH_HAS_STRICT_KERNEL_RWX
 170         select HAVE_CBPF_JIT                    if !PPC64
 171         select HAVE_CONTEXT_TRACKING            if PPC64
 172         select HAVE_DEBUG_KMEMLEAK
 173         select HAVE_DEBUG_STACKOVERFLOW
 174         select HAVE_DMA_API_DEBUG
 175         select HAVE_DYNAMIC_FTRACE
 176         select HAVE_DYNAMIC_FTRACE_WITH_REGS    if MPROFILE_KERNEL
 177         select HAVE_EBPF_JIT                    if PPC64
 178         select HAVE_EFFICIENT_UNALIGNED_ACCESS  if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
 179         select HAVE_FTRACE_MCOUNT_RECORD
 180         select HAVE_FUNCTION_GRAPH_TRACER
 181         select HAVE_FUNCTION_TRACER
 182         select HAVE_GCC_PLUGINS
 183         select HAVE_GENERIC_GUP
 184         select HAVE_HW_BREAKPOINT               if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
 185         select HAVE_IDE
 186         select HAVE_IOREMAP_PROT
 187         select HAVE_IRQ_EXIT_ON_IRQ_STACK
 188         select HAVE_KERNEL_GZIP
 189         select HAVE_KPROBES
 190         select HAVE_KPROBES_ON_FTRACE
 191         select HAVE_KRETPROBES
 192         select HAVE_LIVEPATCH                   if HAVE_DYNAMIC_FTRACE_WITH_REGS
 193         select HAVE_MEMBLOCK
 194         select HAVE_MEMBLOCK_NODE_MAP
 195         select HAVE_MOD_ARCH_SPECIFIC
 196         select HAVE_NMI                         if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
 197         select HAVE_HARDLOCKUP_DETECTOR_ARCH    if (PPC64 && PPC_BOOK3S)
 198         select HAVE_OPROFILE
 199         select HAVE_OPTPROBES                   if PPC64
 200         select HAVE_PERF_EVENTS
 201         select HAVE_PERF_EVENTS_NMI             if PPC64
 202         select HAVE_HARDLOCKUP_DETECTOR_PERF    if HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
 203         select HAVE_PERF_REGS
 204         select HAVE_PERF_USER_STACK_DUMP
 205         select HAVE_RCU_TABLE_FREE              if SMP
 206         select HAVE_REGS_AND_STACK_ACCESS_API
 207         select HAVE_SYSCALL_TRACEPOINTS
 208         select HAVE_VIRT_CPU_ACCOUNTING
 209         select HAVE_IRQ_TIME_ACCOUNTING
 210         select IRQ_DOMAIN
 211         select IRQ_FORCED_THREADING
 212         select MODULES_USE_ELF_RELA
 213         select NO_BOOTMEM
 214         select OF
 215         select OF_EARLY_FLATTREE
 216         select OF_RESERVED_MEM
 217         select OLD_SIGACTION                    if PPC32
 218         select OLD_SIGSUSPEND
 219         select SPARSE_IRQ
 220         select SYSCTL_EXCEPTION_TRACE
 221         select VIRT_TO_BUS                      if !PPC64
 222         #
 223         # Please keep this list sorted alphabetically.
 224         #
 225
 226 config GENERIC_CSUM
 227         def_bool n
 228
 229 config EARLY_PRINTK
 230         bool
 231         default y
 232
 233 config PANIC_TIMEOUT
 234         int
 235         default 180
 236
 237 config COMPAT
 238         bool
 239         default y if PPC64
 240         select COMPAT_BINFMT_ELF
 241         select ARCH_WANT_OLD_COMPAT_IPC
 242         select COMPAT_OLD_SIGACTION
 243
 244 config SYSVIPC_COMPAT
 245         bool
 246         depends on COMPAT && SYSVIPC
 247         default y
 248
 249 # All PPC32s use generic nvram driver through ppc_md
 250 config GENERIC_NVRAM
 251         bool
 252         default y if PPC32
 253
 254 config SCHED_OMIT_FRAME_POINTER
 255         bool
 256         default y
 257
 258 config ARCH_MAY_HAVE_PC_FDC
 259         bool
 260         default PCI
 261
 262 config PPC_UDBG_16550
 263         bool
 264         default n
 265
 266 config GENERIC_TBSYNC
 267         bool
 268         default y if PPC32 && SMP
 269         default n
 270
 271 config AUDIT_ARCH
 272         bool
 273         default y
 274
 275 config GENERIC_BUG
 276         bool
 277         default y
 278         depends on BUG
 279
 280 config SYS_SUPPORTS_APM_EMULATION
 281         default y if PMAC_APM_EMU
 282         bool
 283
 284 config EPAPR_BOOT
 285         bool
 286         help
 287           Used to allow a board to specify it wants an ePAPR compliant wrapper.
 288         default n
 289
 290 config DEFAULT_UIMAGE
 291         bool
 292         help
 293           Used to allow a board to specify it wants a uImage built by default
 294         default n
 295
 296 config ARCH_HIBERNATION_POSSIBLE
 297         bool
 298         default y
 299
 300 config ARCH_SUSPEND_POSSIBLE
 301         def_bool y
 302         depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
 303                    (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
 304                    || 44x || 40x
 305
 306 config PPC_DCR_NATIVE
 307         bool
 308         default n
 309
 310 config PPC_DCR_MMIO
 311         bool
 312         default n
 313
 314 config PPC_DCR
 315         bool
 316         depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
 317         default y
 318
 319 config PPC_OF_PLATFORM_PCI
 320         bool
 321         depends on PCI
 322         depends on PPC64 # not supported on 32 bits yet
 323         default n
 324
 325 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
 326         depends on PPC32 || PPC_STD_MMU_64
 327         def_bool y
 328
 329 config ARCH_SUPPORTS_UPROBES
 330         def_bool y
 331
 332 config PPC_ADV_DEBUG_REGS
 333         bool
 334         depends on 40x || BOOKE
 335         default y
 336
 337 config PPC_ADV_DEBUG_IACS
 338         int
 339         depends on PPC_ADV_DEBUG_REGS
 340         default 4 if 44x
 341         default 2
 342
 343 config PPC_ADV_DEBUG_DACS
 344         int
 345         depends on PPC_ADV_DEBUG_REGS
 346         default 2
 347
 348 config PPC_ADV_DEBUG_DVCS
 349         int
 350         depends on PPC_ADV_DEBUG_REGS
 351         default 2 if 44x
 352         default 0
 353
 354 config PPC_ADV_DEBUG_DAC_RANGE
 355         bool
 356         depends on PPC_ADV_DEBUG_REGS && 44x
 357         default y
 358
 359 config PPC_EMULATE_SSTEP
 360         bool
 361         default y if KPROBES || UPROBES || XMON || HAVE_HW_BREAKPOINT
 362
 363 config ZONE_DMA32
 364         bool
 365         default y if PPC64
 366
 367 config PGTABLE_LEVELS
 368         int
 369         default 2 if !PPC64
 370         default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
 371         default 4
 372
 373 source "init/Kconfig"
 374
 375 source "kernel/Kconfig.freezer"
 376
 377 source "arch/powerpc/sysdev/Kconfig"
 378 source "arch/powerpc/platforms/Kconfig"
 379
 380 menu "Kernel options"
 381
 382 config HIGHMEM
 383         bool "High memory support"
 384         depends on PPC32
 385
 386 source kernel/Kconfig.hz
 387 source kernel/Kconfig.preempt
 388 source "fs/Kconfig.binfmt"
 389
 390 config HUGETLB_PAGE_SIZE_VARIABLE
 391         bool
 392         depends on HUGETLB_PAGE
 393         default y
 394
 395 config MATH_EMULATION
 396         bool "Math emulation"
 397         depends on 4xx || 8xx || PPC_MPC832x || BOOKE
 398         ---help---
 399           Some PowerPC chips designed for embedded applications do not have
 400           a floating-point unit and therefore do not implement the
 401           floating-point instructions in the PowerPC instruction set.  If you
 402           say Y here, the kernel will include code to emulate a floating-point
 403           unit, which will allow programs that use floating-point
 404           instructions to run.
 405
 406           This is also useful to emulate missing (optional) instructions
 407           such as fsqrt on cores that do have an FPU but do not implement
 408           them (such as Freescale BookE).
 409
 410 choice
 411         prompt "Math emulation options"
 412         default MATH_EMULATION_FULL
 413         depends on MATH_EMULATION
 414
 415 config  MATH_EMULATION_FULL
 416         bool "Emulate all the floating point instructions"
 417         ---help---
 418           Select this option will enable the kernel to support to emulate
 419           all the floating point instructions. If your SoC doesn't have
 420           a FPU, you should select this.
 421
 422 config MATH_EMULATION_HW_UNIMPLEMENTED
 423         bool "Just emulate the FPU unimplemented instructions"
 424         ---help---
 425           Select this if you know there does have a hardware FPU on your
 426           SoC, but some floating point instructions are not implemented by that.
 427
 428 endchoice
 429
 430 config PPC_TRANSACTIONAL_MEM
 431        bool "Transactional Memory support for POWERPC"
 432        depends on PPC_BOOK3S_64
 433        depends on SMP
 434        select ALTIVEC
 435        select VSX
 436        default n
 437        ---help---
 438          Support user-mode Transactional Memory on POWERPC.
 439
 440 config LD_HEAD_STUB_CATCH
 441         bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
 442         depends on PPC64
 443         default n
 444         help
 445           Very large kernels can cause linker branch stubs to be generated by
 446           code in head_64.S, which moves the head text sections out of their
 447           specified location. This option can work around the problem.
 448
 449           If unsure, say "N".
 450
 451 config DISABLE_MPROFILE_KERNEL
 452         bool "Disable use of mprofile-kernel for kernel tracing"
 453         depends on PPC64 && CPU_LITTLE_ENDIAN
 454         default y
 455         help
 456           Selecting this options disables use of the mprofile-kernel ABI for
 457           kernel tracing. That will cause options such as live patching
 458           (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
 459           be disabled also.
 460
 461           If you have a toolchain which supports mprofile-kernel, then you can
 462           disable this. Otherwise leave it enabled. If you're not sure, say
 463           "Y".
 464
 465 config MPROFILE_KERNEL
 466         depends on PPC64 && CPU_LITTLE_ENDIAN
 467         def_bool !DISABLE_MPROFILE_KERNEL
 468
 469 config IOMMU_HELPER
 470         def_bool PPC64
 471
 472 config SWIOTLB
 473         bool "SWIOTLB support"
 474         default n
 475         select IOMMU_HELPER
 476         ---help---
 477           Support for IO bounce buffering for systems without an IOMMU.
 478           This allows us to DMA to the full physical address space on
 479           platforms where the size of a physical address is larger
 480           than the bus address.  Not all platforms support this.
 481
 482 config HOTPLUG_CPU
 483         bool "Support for enabling/disabling CPUs"
 484         depends on SMP && (PPC_PSERIES || \
 485         PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
 486         ---help---
 487           Say Y here to be able to disable and re-enable individual
 488           CPUs at runtime on SMP machines.
 489
 490           Say N if you are unsure.
 491
 492 config ARCH_CPU_PROBE_RELEASE
 493         def_bool y
 494         depends on HOTPLUG_CPU
 495
 496 config ARCH_ENABLE_MEMORY_HOTPLUG
 497         def_bool y
 498
 499 config ARCH_HAS_WALK_MEMORY
 500         def_bool y
 501
 502 config ARCH_ENABLE_MEMORY_HOTREMOVE
 503         def_bool y
 504
 505 config PPC64_SUPPORTS_MEMORY_FAILURE
 506         bool "Add support for memory hwpoison"
 507         depends on PPC_BOOK3S_64
 508         default "y" if PPC_POWERNV
 509         select ARCH_SUPPORTS_MEMORY_FAILURE
 510
 511 config KEXEC
 512         bool "kexec system call"
 513         depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
 514         select KEXEC_CORE
 515         help
 516           kexec is a system call that implements the ability to shutdown your
 517           current kernel, and to start another kernel.  It is like a reboot
 518           but it is independent of the system firmware.   And like a reboot
 519           you can start any kernel with it, not just Linux.
 520
 521           The name comes from the similarity to the exec system call.
 522
 523           It is an ongoing process to be certain the hardware in a machine
 524           is properly shutdown, so do not be surprised if this code does not
 525           initially work for you.  As of this writing the exact hardware
 526           interface is strongly in flux, so no good recommendation can be
 527           made.
 528
 529 config KEXEC_FILE
 530         bool "kexec file based system call"
 531         select KEXEC_CORE
 532         select HAVE_IMA_KEXEC
 533         select BUILD_BIN2C
 534         depends on PPC64
 535         depends on CRYPTO=y
 536         depends on CRYPTO_SHA256=y
 537         help
 538           This is a new version of the kexec system call. This call is
 539           file based and takes in file descriptors as system call arguments
 540           for kernel and initramfs as opposed to a list of segments as is the
 541           case for the older kexec call.
 542
 543 config RELOCATABLE
 544         bool "Build a relocatable kernel"
 545         depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
 546         select NONSTATIC_KERNEL
 547         select MODULE_REL_CRCS if MODVERSIONS
 548         help
 549           This builds a kernel image that is capable of running at the
 550           location the kernel is loaded at. For ppc32, there is no any
 551           alignment restrictions, and this feature is a superset of
 552           DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
 553           16k-aligned base address. The kernel is linked as a
 554           position-independent executable (PIE) and contains dynamic relocations
 555           which are processed early in the bootup process.
 556
 557           One use is for the kexec on panic case where the recovery kernel
 558           must live at a different physical address than the primary
 559           kernel.
 560
 561           Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
 562           it has been loaded at and the compile time physical addresses
 563           CONFIG_PHYSICAL_START is ignored.  However CONFIG_PHYSICAL_START
 564           setting can still be useful to bootwrappers that need to know the
 565           load address of the kernel (eg. u-boot/mkimage).
 566
 567 config RELOCATABLE_TEST
 568         bool "Test relocatable kernel"
 569         depends on (PPC64 && RELOCATABLE)
 570         default n
 571         help
 572           This runs the relocatable kernel at the address it was initially
 573           loaded at, which tends to be non-zero and therefore test the
 574           relocation code.
 575
 576 config CRASH_DUMP
 577         bool "Build a dump capture kernel"
 578         depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
 579         select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
 580         help
 581           Build a kernel suitable for use as a dump capture kernel.
 582           The same kernel binary can be used as production kernel and dump
 583           capture kernel.
 584
 585 config FA_DUMP
 586         bool "Firmware-assisted dump"
 587         depends on PPC64 && PPC_RTAS
 588         select CRASH_CORE
 589         select CRASH_DUMP
 590         help
 591           A robust mechanism to get reliable kernel crash dump with
 592           assistance from firmware. This approach does not use kexec,
 593           instead firmware assists in booting the capture kernel
 594           while preserving memory contents. Firmware-assisted dump
 595           is meant to be a kdump replacement offering robustness and
 596           speed not possible without system firmware assistance.
 597
 598           If unsure, say "N"
 599
 600 config IRQ_ALL_CPUS
 601         bool "Distribute interrupts on all CPUs by default"
 602         depends on SMP
 603         help
 604           This option gives the kernel permission to distribute IRQs across
 605           multiple CPUs.  Saying N here will route all IRQs to the first
 606           CPU.  Generally saying Y is safe, although some problems have been
 607           reported with SMP Power Macintoshes with this option enabled.
 608
 609 config NUMA
 610         bool "NUMA support"
 611         depends on PPC64
 612         default y if SMP && PPC_PSERIES
 613
 614 config NODES_SHIFT
 615         int
 616         default "8" if PPC64
 617         default "4"
 618         depends on NEED_MULTIPLE_NODES
 619
 620 config USE_PERCPU_NUMA_NODE_ID
 621         def_bool y
 622         depends on NUMA
 623
 624 config HAVE_MEMORYLESS_NODES
 625         def_bool y
 626         depends on NUMA
 627
 628 config ARCH_SELECT_MEMORY_MODEL
 629         def_bool y
 630         depends on PPC64
 631
 632 config ARCH_FLATMEM_ENABLE
 633         def_bool y
 634         depends on (PPC64 && !NUMA) || PPC32
 635
 636 config ARCH_SPARSEMEM_ENABLE
 637         def_bool y
 638         depends on PPC64
 639         select SPARSEMEM_VMEMMAP_ENABLE
 640
 641 config ARCH_SPARSEMEM_DEFAULT
 642         def_bool y
 643         depends on PPC_BOOK3S_64
 644
 645 config SYS_SUPPORTS_HUGETLBFS
 646         bool
 647
 648 config ILLEGAL_POINTER_VALUE
 649         hex
 650         # This is roughly half way between the top of user space and the bottom
 651         # of kernel space, which seems about as good as we can get.
 652         default 0x5deadbeef0000000 if PPC64
 653         default 0
 654
 655 source "mm/Kconfig"
 656
 657 config ARCH_MEMORY_PROBE
 658         def_bool y
 659         depends on MEMORY_HOTPLUG
 660
 661 # Some NUMA nodes have memory ranges that span
 662 # other nodes.  Even though a pfn is valid and
 663 # between a node's start and end pfns, it may not
 664 # reside on that node.  See memmap_init_zone()
 665 # for details.
 666 config NODES_SPAN_OTHER_NODES
 667         def_bool y
 668         depends on NEED_MULTIPLE_NODES
 669
 670 config STDBINUTILS
 671         bool "Using standard binutils settings"
 672         depends on 44x
 673         default y
 674         help
 675           Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
 676           Note, that kernel will be able to run only those applications,
 677           which had been compiled using binutils later than 2.17.50.0.3 with
 678           '-zmax-page-size' set to 256K (the default is 64K). Or, if using
 679           the older binutils, you can patch them with a trivial patch, which
 680           changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
 681
 682 choice
 683         prompt "Page size"
 684         default PPC_4K_PAGES
 685         help
 686           Select the kernel logical page size. Increasing the page size
 687           will reduce software overhead at each page boundary, allow
 688           hardware prefetch mechanisms to be more effective, and allow
 689           larger dma transfers increasing IO efficiency and reducing
 690           overhead. However the utilization of memory will increase.
 691           For example, each cached file will using a multiple of the
 692           page size to hold its contents and the difference between the
 693           end of file and the end of page is wasted.
 694
 695           Some dedicated systems, such as software raid serving with
 696           accelerated calculations, have shown significant increases.
 697
 698           If you configure a 64 bit kernel for 64k pages but the
 699           processor does not support them, then the kernel will simulate
 700           them with 4k pages, loading them on demand, but with the
 701           reduced software overhead and larger internal fragmentation.
 702           For the 32 bit kernel, a large page option will not be offered
 703           unless it is supported by the configured processor.
 704
 705           If unsure, choose 4K_PAGES.
 706
 707 config PPC_4K_PAGES
 708         bool "4k page size"
 709         select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
 710
 711 config PPC_16K_PAGES
 712         bool "16k page size"
 713         depends on 44x || PPC_8xx
 714
 715 config PPC_64K_PAGES
 716         bool "64k page size"
 717         depends on !PPC_FSL_BOOK3E && (44x || PPC_STD_MMU_64 || PPC_BOOK3E_64)
 718         select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
 719
 720 config PPC_256K_PAGES
 721         bool "256k page size"
 722         depends on 44x && !STDBINUTILS
 723         help
 724           Make the page size 256k.
 725
 726           As the ELF standard only requires alignment to support page
 727           sizes up to 64k, you will need to compile all of your user
 728           space applications with a non-standard binutils settings
 729           (see the STDBINUTILS description for details).
 730
 731           Say N unless you know what you are doing.
 732
 733 endchoice
 734
 735 config THREAD_SHIFT
 736         int "Thread shift" if EXPERT
 737         range 13 15
 738         default "15" if PPC_256K_PAGES
 739         default "14" if PPC64
 740         default "13"
 741         help
 742           Used to define the stack size. The default is almost always what you
 743           want. Only change this if you know what you are doing.
 744
 745 config FORCE_MAX_ZONEORDER
 746         int "Maximum zone order"
 747         range 8 9 if PPC64 && PPC_64K_PAGES
 748         default "9" if PPC64 && PPC_64K_PAGES
 749         range 13 13 if PPC64 && !PPC_64K_PAGES
 750         default "13" if PPC64 && !PPC_64K_PAGES
 751         range 9 64 if PPC32 && PPC_16K_PAGES
 752         default "9" if PPC32 && PPC_16K_PAGES
 753         range 7 64 if PPC32 && PPC_64K_PAGES
 754         default "7" if PPC32 && PPC_64K_PAGES
 755         range 5 64 if PPC32 && PPC_256K_PAGES
 756         default "5" if PPC32 && PPC_256K_PAGES
 757         range 11 64
 758         default "11"
 759         help
 760           The kernel memory allocator divides physically contiguous memory
 761           blocks into "zones", where each zone is a power of two number of
 762           pages.  This option selects the largest power of two that the kernel
 763           keeps in the memory allocator.  If you need to allocate very large
 764           blocks of physically contiguous memory, then you may need to
 765           increase this value.
 766
 767           This config option is actually maximum order plus one. For example,
 768           a value of 11 means that the largest free memory block is 2^10 pages.
 769
 770           The page size is not necessarily 4KB.  For example, on 64-bit
 771           systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES.  Keep
 772           this in mind when choosing a value for this option.
 773
 774 config PPC_SUBPAGE_PROT
 775         bool "Support setting protections for 4k subpages"
 776         depends on PPC_STD_MMU_64 && PPC_64K_PAGES
 777         help
 778           This option adds support for a system call to allow user programs
 779           to set access permissions (read/write, readonly, or no access)
 780           on the 4k subpages of each 64k page.
 781
 782 config PPC_COPRO_BASE
 783         bool
 784         default n
 785
 786 config SCHED_SMT
 787         bool "SMT (Hyperthreading) scheduler support"
 788         depends on PPC64 && SMP
 789         help
 790           SMT scheduler support improves the CPU scheduler's decision making
 791           when dealing with POWER5 cpus at a cost of slightly increased
 792           overhead in some places. If unsure say N here.
 793
 794 config PPC_DENORMALISATION
 795         bool "PowerPC denormalisation exception handling"
 796         depends on PPC_BOOK3S_64
 797         default "y" if PPC_POWERNV
 798         ---help---
 799           Add support for handling denormalisation of single precision
 800           values.  Useful for bare metal only.  If unsure say Y here.
 801
 802 config CMDLINE_BOOL
 803         bool "Default bootloader kernel arguments"
 804
 805 config CMDLINE
 806         string "Initial kernel command string"
 807         depends on CMDLINE_BOOL
 808         default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
 809         help
 810           On some platforms, there is currently no way for the boot loader to
 811           pass arguments to the kernel. For these platforms, you can supply
 812           some command-line options at build time by entering them here.  In
 813           most cases you will need to specify the root device here.
 814
 815 config CMDLINE_FORCE
 816         bool "Always use the default kernel command string"
 817         depends on CMDLINE_BOOL
 818         help
 819           Always use the default kernel command string, even if the boot
 820           loader passes other arguments to the kernel.
 821           This is useful if you cannot or don't want to change the
 822           command-line options your boot loader passes to the kernel.
 823
 824 config EXTRA_TARGETS
 825         string "Additional default image types"
 826         help
 827           List additional targets to be built by the bootwrapper here (separated
 828           by spaces).  This is useful for targets that depend of device tree
 829           files in the .dts directory.
 830
 831           Targets in this list will be build as part of the default build
 832           target, or when the user does a 'make zImage' or a
 833           'make zImage.initrd'.
 834
 835           If unsure, leave blank
 836
 837 config ARCH_WANTS_FREEZER_CONTROL
 838         def_bool y
 839         depends on ADB_PMU
 840
 841 source kernel/power/Kconfig
 842
 843 config SECCOMP
 844         bool "Enable seccomp to safely compute untrusted bytecode"
 845         depends on PROC_FS
 846         default y
 847         help
 848           This kernel feature is useful for number crunching applications
 849           that may need to compute untrusted bytecode during their
 850           execution. By using pipes or other transports made available to
 851           the process as file descriptors supporting the read/write
 852           syscalls, it's possible to isolate those applications in
 853           their own address space using seccomp. Once seccomp is
 854           enabled via /proc/<pid>/seccomp, it cannot be disabled
 855           and the task is only allowed to execute a few safe syscalls
 856           defined by each seccomp mode.
 857
 858           If unsure, say Y. Only embedded should say N here.
 859
 860 endmenu
 861
 862 config ISA_DMA_API
 863         bool
 864         default PCI
 865
 866 menu "Bus options"
 867
 868 config ISA
 869         bool "Support for ISA-bus hardware"
 870         depends on PPC_CHRP
 871         select PPC_I8259
 872         help
 873           Find out whether you have ISA slots on your motherboard.  ISA is the
 874           name of a bus system, i.e. the way the CPU talks to the other stuff
 875           inside your box.  If you have an Apple machine, say N here; if you
 876           have an IBM RS/6000 or pSeries machine, say Y.  If you have an
 877           embedded board, consult your board documentation.
 878
 879 config ZONE_DMA
 880         bool
 881         default y
 882
 883 config NEED_DMA_MAP_STATE
 884         def_bool (PPC64 || NOT_COHERENT_CACHE)
 885
 886 config NEED_SG_DMA_LENGTH
 887         def_bool y
 888
 889 config GENERIC_ISA_DMA
 890         bool
 891         depends on ISA_DMA_API
 892         default y
 893
 894 config PPC_INDIRECT_PCI
 895         bool
 896         depends on PCI
 897         default y if 40x || 44x
 898         default n
 899
 900 config EISA
 901         bool
 902
 903 config SBUS
 904         bool
 905
 906 config FSL_SOC
 907         bool
 908
 909 config FSL_PCI
 910         bool
 911         select PPC_INDIRECT_PCI
 912         select PCI_QUIRKS
 913
 914 config FSL_PMC
 915         bool
 916         default y
 917         depends on SUSPEND && (PPC_85xx || PPC_86xx)
 918         help
 919           Freescale MPC85xx/MPC86xx power management controller support
 920           (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
 921
 922 config PPC4xx_CPM
 923         bool
 924         default y
 925         depends on SUSPEND && (44x || 40x)
 926         help
 927           PPC4xx Clock Power Management (CPM) support (suspend/resume).
 928           It also enables support for two different idle states (idle-wait
 929           and idle-doze).
 930
 931 config 4xx_SOC
 932         bool
 933
 934 config FSL_LBC
 935         bool "Freescale Local Bus support"
 936         help
 937           Enables reporting of errors from the Freescale local bus
 938           controller.  Also contains some common code used by
 939           drivers for specific local bus peripherals.
 940
 941 config FSL_GTM
 942         bool
 943         depends on PPC_83xx || QUICC_ENGINE || CPM2
 944         help
 945           Freescale General-purpose Timers support
 946
 947 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
 948 config MCA
 949         bool
 950
 951 # Platforms that what PCI turned unconditionally just do select PCI
 952 # in their config node.  Platforms that want to choose at config
 953 # time should select PPC_PCI_CHOICE
 954 config PPC_PCI_CHOICE
 955         bool
 956
 957 config PCI
 958         bool "PCI support" if PPC_PCI_CHOICE
 959         default y if !40x && !CPM2 && !8xx && !PPC_83xx \
 960                 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
 961         default PCI_QSPAN if !4xx && !CPM2 && 8xx
 962         select GENERIC_PCI_IOMAP
 963         help
 964           Find out whether your system includes a PCI bus. PCI is the name of
 965           a bus system, i.e. the way the CPU talks to the other stuff inside
 966           your box.  If you say Y here, the kernel will include drivers and
 967           infrastructure code to support PCI bus devices.
 968
 969 config PCI_DOMAINS
 970         def_bool PCI
 971
 972 config PCI_SYSCALL
 973         def_bool PCI
 974
 975 config PCI_QSPAN
 976         bool "QSpan PCI"
 977         depends on !4xx && !CPM2 && 8xx
 978         select PPC_I8259
 979         help
 980           Say Y here if you have a system based on a Motorola 8xx-series
 981           embedded processor with a QSPAN PCI interface, otherwise say N.
 982
 983 config PCI_8260
 984         bool
 985         depends on PCI && 8260
 986         select PPC_INDIRECT_PCI
 987         default y
 988
 989 source "drivers/pci/Kconfig"
 990
 991 source "drivers/pcmcia/Kconfig"
 992
 993 config HAS_RAPIDIO
 994         bool
 995         default n
 996
 997 config RAPIDIO
 998         tristate "RapidIO support"
 999         depends on HAS_RAPIDIO || PCI
1000         help
1001           If you say Y here, the kernel will include drivers and
1002           infrastructure code to support RapidIO interconnect devices.
1003
1004 config FSL_RIO
1005         bool "Freescale Embedded SRIO Controller support"
1006         depends on RAPIDIO = y && HAS_RAPIDIO
1007         default "n"
1008         ---help---
1009           Include support for RapidIO controller on Freescale embedded
1010           processors (MPC8548, MPC8641, etc).
1011
1012 source "drivers/rapidio/Kconfig"
1013
1014 endmenu
1015
1016 config NONSTATIC_KERNEL
1017         bool
1018         default n
1019
1020 menu "Advanced setup"
1021         depends on PPC32
1022
1023 config ADVANCED_OPTIONS
1024         bool "Prompt for advanced kernel configuration options"
1025         help
1026           This option will enable prompting for a variety of advanced kernel
1027           configuration options.  These options can cause the kernel to not
1028           work if they are set incorrectly, but can be used to optimize certain
1029           aspects of kernel memory management.
1030
1031           Unless you know what you are doing, say N here.
1032
1033 comment "Default settings for advanced configuration options are used"
1034         depends on !ADVANCED_OPTIONS
1035
1036 config LOWMEM_SIZE_BOOL
1037         bool "Set maximum low memory"
1038         depends on ADVANCED_OPTIONS
1039         help
1040           This option allows you to set the maximum amount of memory which
1041           will be used as "low memory", that is, memory which the kernel can
1042           access directly, without having to set up a kernel virtual mapping.
1043           This can be useful in optimizing the layout of kernel virtual
1044           memory.
1045
1046           Say N here unless you know what you are doing.
1047
1048 config LOWMEM_SIZE
1049         hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1050         default "0x30000000"
1051
1052 config LOWMEM_CAM_NUM_BOOL
1053         bool "Set number of CAMs to use to map low memory"
1054         depends on ADVANCED_OPTIONS && FSL_BOOKE
1055         help
1056           This option allows you to set the maximum number of CAM slots that
1057           will be used to map low memory.  There are a limited number of slots
1058           available and even more limited number that will fit in the L1 MMU.
1059           However, using more entries will allow mapping more low memory.  This
1060           can be useful in optimizing the layout of kernel virtual memory.
1061
1062           Say N here unless you know what you are doing.
1063
1064 config LOWMEM_CAM_NUM
1065         depends on FSL_BOOKE
1066         int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1067         default 3
1068
1069 config DYNAMIC_MEMSTART
1070         bool "Enable page aligned dynamic load address for kernel"
1071         depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1072         select NONSTATIC_KERNEL
1073         help
1074           This option enables the kernel to be loaded at any page aligned
1075           physical address. The kernel creates a mapping from KERNELBASE to
1076           the address where the kernel is loaded. The page size here implies
1077           the TLB page size of the mapping for kernel on the particular platform.
1078           Please refer to the init code for finding the TLB page size.
1079
1080           DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1081           kernel image, where the only restriction is the page aligned kernel
1082           load address. When this option is enabled, the compile time physical
1083           address CONFIG_PHYSICAL_START is ignored.
1084
1085           This option is overridden by CONFIG_RELOCATABLE
1086
1087 config PAGE_OFFSET_BOOL
1088         bool "Set custom page offset address"
1089         depends on ADVANCED_OPTIONS
1090         help
1091           This option allows you to set the kernel virtual address at which
1092           the kernel will map low memory.  This can be useful in optimizing
1093           the virtual memory layout of the system.
1094
1095           Say N here unless you know what you are doing.
1096
1097 config PAGE_OFFSET
1098         hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1099         default "0xc0000000"
1100
1101 config KERNEL_START_BOOL
1102         bool "Set custom kernel base address"
1103         depends on ADVANCED_OPTIONS
1104         help
1105           This option allows you to set the kernel virtual address at which
1106           the kernel will be loaded.  Normally this should match PAGE_OFFSET
1107           however there are times (like kdump) that one might not want them
1108           to be the same.
1109
1110           Say N here unless you know what you are doing.
1111
1112 config KERNEL_START
1113         hex "Virtual address of kernel base" if KERNEL_START_BOOL
1114         default PAGE_OFFSET if PAGE_OFFSET_BOOL
1115         default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1116         default "0xc0000000"
1117
1118 config PHYSICAL_START_BOOL
1119         bool "Set physical address where the kernel is loaded"
1120         depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1121         help
1122           This gives the physical address where the kernel is loaded.
1123
1124           Say N here unless you know what you are doing.
1125
1126 config PHYSICAL_START
1127         hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1128         default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1129         default "0x00000000"
1130
1131 config PHYSICAL_ALIGN
1132         hex
1133         default "0x04000000" if FSL_BOOKE
1134         help
1135           This value puts the alignment restrictions on physical address
1136           where kernel is loaded and run from. Kernel is compiled for an
1137           address which meets above alignment restriction.
1138
1139 config TASK_SIZE_BOOL
1140         bool "Set custom user task size"
1141         depends on ADVANCED_OPTIONS
1142         help
1143           This option allows you to set the amount of virtual address space
1144           allocated to user tasks.  This can be useful in optimizing the
1145           virtual memory layout of the system.
1146
1147           Say N here unless you know what you are doing.
1148
1149 config TASK_SIZE
1150         hex "Size of user task space" if TASK_SIZE_BOOL
1151         default "0x80000000" if PPC_8xx
1152         default "0xc0000000"
1153
1154 config CONSISTENT_SIZE_BOOL
1155         bool "Set custom consistent memory pool size"
1156         depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1157         help
1158           This option allows you to set the size of the
1159           consistent memory pool.  This pool of virtual memory
1160           is used to make consistent memory allocations.
1161
1162 config CONSISTENT_SIZE
1163         hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1164         default "0x00200000" if NOT_COHERENT_CACHE
1165
1166 config PIN_TLB
1167         bool "Pinned Kernel TLBs (860 ONLY)"
1168         depends on ADVANCED_OPTIONS && 8xx
1169
1170 config PIN_TLB_IMMR
1171         bool "Pinned TLB for IMMR"
1172         depends on PIN_TLB
1173         default y
1174 endmenu
1175
1176 if PPC64
1177 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1178 config PAGE_OFFSET
1179         hex
1180         default "0xc000000000000000"
1181 config KERNEL_START
1182         hex
1183         default "0xc000000000000000"
1184 config PHYSICAL_START
1185         hex
1186         default "0x00000000"
1187 endif
1188
1189 config  ARCH_RANDOM
1190         def_bool n
1191
1192 source "net/Kconfig"
1193
1194 source "drivers/Kconfig"
1195
1196 source "fs/Kconfig"
1197
1198 source "lib/Kconfig"
1199
1200 source "arch/powerpc/Kconfig.debug"
1201
1202 source "security/Kconfig"
1203
1204 source "crypto/Kconfig"
1205
1206 config PPC_LIB_RHEAP
1207         bool
1208
1209 source "arch/powerpc/kvm/Kconfig"
1210
1211 source "kernel/livepatch/Kconfig"