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 PPC_WATCHDOG
  89         bool
  90         depends on HARDLOCKUP_DETECTOR
  91         depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
  92         default y
  93         help
  94           This is a placeholder when the powerpc hardlockup detector
  95           watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
  96           seleted via the generic lockup detector menu which is why we
  97           have no standalone config option for it here.
  98
  99 config STACKTRACE_SUPPORT
 100         bool
 101         default y
 102
 103 config TRACE_IRQFLAGS_SUPPORT
 104         bool
 105         default y
 106
 107 config LOCKDEP_SUPPORT
 108         bool
 109         default y
 110
 111 config RWSEM_GENERIC_SPINLOCK
 112         bool
 113
 114 config RWSEM_XCHGADD_ALGORITHM
 115         bool
 116         default y
 117
 118 config GENERIC_LOCKBREAK
 119         bool
 120         default y
 121         depends on SMP && PREEMPT
 122
 123 config GENERIC_HWEIGHT
 124         bool
 125         default y
 126
 127 config ARCH_HAS_DMA_SET_COHERENT_MASK
 128         bool
 129
 130 config PPC
 131         bool
 132         default y
 133         #
 134         # Please keep this list sorted alphabetically.
 135         #
 136         select ARCH_HAS_DEVMEM_IS_ALLOWED
 137         select ARCH_HAS_DMA_SET_COHERENT_MASK
 138         select ARCH_HAS_ELF_RANDOMIZE
 139         select ARCH_HAS_FORTIFY_SOURCE
 140         select ARCH_HAS_GCOV_PROFILE_ALL
 141         select ARCH_HAS_SCALED_CPUTIME          if VIRT_CPU_ACCOUNTING_NATIVE
 142         select ARCH_HAS_SG_CHAIN
 143         select ARCH_HAS_TICK_BROADCAST          if GENERIC_CLOCKEVENTS_BROADCAST
 144         select ARCH_HAS_UBSAN_SANITIZE_ALL
 145         select ARCH_HAS_ZONE_DEVICE             if PPC_BOOK3S_64
 146         select ARCH_HAVE_NMI_SAFE_CMPXCHG
 147         select ARCH_MIGHT_HAVE_PC_PARPORT
 148         select ARCH_MIGHT_HAVE_PC_SERIO
 149         select ARCH_SUPPORTS_ATOMIC_RMW
 150         select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
 151         select ARCH_USE_BUILTIN_BSWAP
 152         select ARCH_USE_CMPXCHG_LOCKREF         if PPC64
 153         select ARCH_WANT_IPC_PARSE_VERSION
 154         select ARCH_WEAK_RELEASE_ACQUIRE
 155         select BINFMT_ELF
 156         select BUILDTIME_EXTABLE_SORT
 157         select CLONE_BACKWARDS
 158         select DCACHE_WORD_ACCESS               if PPC64 && CPU_LITTLE_ENDIAN
 159         select EDAC_ATOMIC_SCRUB
 160         select EDAC_SUPPORT
 161         select GENERIC_ATOMIC64                 if PPC32
 162         select GENERIC_CLOCKEVENTS
 163         select GENERIC_CLOCKEVENTS_BROADCAST    if SMP
 164         select GENERIC_CMOS_UPDATE
 165         select GENERIC_CPU_AUTOPROBE
 166         select GENERIC_IRQ_SHOW
 167         select GENERIC_IRQ_SHOW_LEVEL
 168         select GENERIC_SMP_IDLE_THREAD
 169         select GENERIC_STRNCPY_FROM_USER
 170         select GENERIC_STRNLEN_USER
 171         select GENERIC_TIME_VSYSCALL
 172         select HAVE_ARCH_AUDITSYSCALL
 173         select HAVE_ARCH_JUMP_LABEL
 174         select HAVE_ARCH_KGDB
 175         select HAVE_ARCH_MMAP_RND_BITS
 176         select HAVE_ARCH_MMAP_RND_COMPAT_BITS   if COMPAT
 177         select HAVE_ARCH_SECCOMP_FILTER
 178         select HAVE_ARCH_TRACEHOOK
 179         select ARCH_HAS_STRICT_KERNEL_RWX       if (PPC_BOOK3S_64 && !RELOCATABLE && !HIBERNATION)
 180         select ARCH_OPTIONAL_KERNEL_RWX         if ARCH_HAS_STRICT_KERNEL_RWX
 181         select HAVE_CBPF_JIT                    if !PPC64
 182         select HAVE_CONTEXT_TRACKING            if PPC64
 183         select HAVE_DEBUG_KMEMLEAK
 184         select HAVE_DEBUG_STACKOVERFLOW
 185         select HAVE_DMA_API_DEBUG
 186         select HAVE_DYNAMIC_FTRACE
 187         select HAVE_DYNAMIC_FTRACE_WITH_REGS    if MPROFILE_KERNEL
 188         select HAVE_EBPF_JIT                    if PPC64
 189         select HAVE_EFFICIENT_UNALIGNED_ACCESS  if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
 190         select HAVE_FTRACE_MCOUNT_RECORD
 191         select HAVE_FUNCTION_GRAPH_TRACER
 192         select HAVE_FUNCTION_TRACER
 193         select HAVE_GCC_PLUGINS
 194         select HAVE_GENERIC_GUP
 195         select HAVE_HW_BREAKPOINT               if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
 196         select HAVE_IDE
 197         select HAVE_IOREMAP_PROT
 198         select HAVE_IRQ_EXIT_ON_IRQ_STACK
 199         select HAVE_KERNEL_GZIP
 200         select HAVE_KPROBES
 201         select HAVE_KPROBES_ON_FTRACE
 202         select HAVE_KRETPROBES
 203         select HAVE_LIVEPATCH                   if HAVE_DYNAMIC_FTRACE_WITH_REGS
 204         select HAVE_MEMBLOCK
 205         select HAVE_MEMBLOCK_NODE_MAP
 206         select HAVE_MOD_ARCH_SPECIFIC
 207         select HAVE_NMI                         if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
 208         select HAVE_HARDLOCKUP_DETECTOR_ARCH    if (PPC64 && PPC_BOOK3S)
 209         select HAVE_OPROFILE
 210         select HAVE_OPTPROBES                   if PPC64
 211         select HAVE_PERF_EVENTS
 212         select HAVE_PERF_EVENTS_NMI             if PPC64
 213         select HAVE_HARDLOCKUP_DETECTOR_PERF    if HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
 214         select HAVE_PERF_REGS
 215         select HAVE_PERF_USER_STACK_DUMP
 216         select HAVE_RCU_TABLE_FREE              if SMP
 217         select HAVE_REGS_AND_STACK_ACCESS_API
 218         select HAVE_SYSCALL_TRACEPOINTS
 219         select HAVE_VIRT_CPU_ACCOUNTING
 220         select HAVE_IRQ_TIME_ACCOUNTING
 221         select IRQ_DOMAIN
 222         select IRQ_FORCED_THREADING
 223         select MODULES_USE_ELF_RELA
 224         select NO_BOOTMEM
 225         select OF
 226         select OF_EARLY_FLATTREE
 227         select OF_RESERVED_MEM
 228         select OLD_SIGACTION                    if PPC32
 229         select OLD_SIGSUSPEND
 230         select SPARSE_IRQ
 231         select SYSCTL_EXCEPTION_TRACE
 232         select VIRT_TO_BUS                      if !PPC64
 233         #
 234         # Please keep this list sorted alphabetically.
 235         #
 236
 237 config GENERIC_CSUM
 238         def_bool n
 239
 240 config EARLY_PRINTK
 241         bool
 242         default y
 243
 244 config PANIC_TIMEOUT
 245         int
 246         default 180
 247
 248 config COMPAT
 249         bool
 250         default y if PPC64
 251         select COMPAT_BINFMT_ELF
 252         select ARCH_WANT_OLD_COMPAT_IPC
 253         select COMPAT_OLD_SIGACTION
 254
 255 config SYSVIPC_COMPAT
 256         bool
 257         depends on COMPAT && SYSVIPC
 258         default y
 259
 260 # All PPC32s use generic nvram driver through ppc_md
 261 config GENERIC_NVRAM
 262         bool
 263         default y if PPC32
 264
 265 config SCHED_OMIT_FRAME_POINTER
 266         bool
 267         default y
 268
 269 config ARCH_MAY_HAVE_PC_FDC
 270         bool
 271         default PCI
 272
 273 config PPC_UDBG_16550
 274         bool
 275         default n
 276
 277 config GENERIC_TBSYNC
 278         bool
 279         default y if PPC32 && SMP
 280         default n
 281
 282 config AUDIT_ARCH
 283         bool
 284         default y
 285
 286 config GENERIC_BUG
 287         bool
 288         default y
 289         depends on BUG
 290
 291 config SYS_SUPPORTS_APM_EMULATION
 292         default y if PMAC_APM_EMU
 293         bool
 294
 295 config EPAPR_BOOT
 296         bool
 297         help
 298           Used to allow a board to specify it wants an ePAPR compliant wrapper.
 299         default n
 300
 301 config DEFAULT_UIMAGE
 302         bool
 303         help
 304           Used to allow a board to specify it wants a uImage built by default
 305         default n
 306
 307 config ARCH_HIBERNATION_POSSIBLE
 308         bool
 309         default y
 310
 311 config ARCH_SUSPEND_POSSIBLE
 312         def_bool y
 313         depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
 314                    (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
 315                    || 44x || 40x
 316
 317 config PPC_DCR_NATIVE
 318         bool
 319         default n
 320
 321 config PPC_DCR_MMIO
 322         bool
 323         default n
 324
 325 config PPC_DCR
 326         bool
 327         depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
 328         default y
 329
 330 config PPC_OF_PLATFORM_PCI
 331         bool
 332         depends on PCI
 333         depends on PPC64 # not supported on 32 bits yet
 334         default n
 335
 336 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
 337         depends on PPC32 || PPC_STD_MMU_64
 338         def_bool y
 339
 340 config ARCH_SUPPORTS_UPROBES
 341         def_bool y
 342
 343 config PPC_ADV_DEBUG_REGS
 344         bool
 345         depends on 40x || BOOKE
 346         default y
 347
 348 config PPC_ADV_DEBUG_IACS
 349         int
 350         depends on PPC_ADV_DEBUG_REGS
 351         default 4 if 44x
 352         default 2
 353
 354 config PPC_ADV_DEBUG_DACS
 355         int
 356         depends on PPC_ADV_DEBUG_REGS
 357         default 2
 358
 359 config PPC_ADV_DEBUG_DVCS
 360         int
 361         depends on PPC_ADV_DEBUG_REGS
 362         default 2 if 44x
 363         default 0
 364
 365 config PPC_ADV_DEBUG_DAC_RANGE
 366         bool
 367         depends on PPC_ADV_DEBUG_REGS && 44x
 368         default y
 369
 370 config PPC_EMULATE_SSTEP
 371         bool
 372         default y if KPROBES || UPROBES || XMON || HAVE_HW_BREAKPOINT
 373
 374 config ZONE_DMA32
 375         bool
 376         default y if PPC64
 377
 378 config PGTABLE_LEVELS
 379         int
 380         default 2 if !PPC64
 381         default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
 382         default 4
 383
 384 source "init/Kconfig"
 385
 386 source "kernel/Kconfig.freezer"
 387
 388 source "arch/powerpc/sysdev/Kconfig"
 389 source "arch/powerpc/platforms/Kconfig"
 390
 391 menu "Kernel options"
 392
 393 config HIGHMEM
 394         bool "High memory support"
 395         depends on PPC32
 396
 397 source kernel/Kconfig.hz
 398 source kernel/Kconfig.preempt
 399 source "fs/Kconfig.binfmt"
 400
 401 config HUGETLB_PAGE_SIZE_VARIABLE
 402         bool
 403         depends on HUGETLB_PAGE
 404         default y
 405
 406 config MATH_EMULATION
 407         bool "Math emulation"
 408         depends on 4xx || 8xx || PPC_MPC832x || BOOKE
 409         ---help---
 410           Some PowerPC chips designed for embedded applications do not have
 411           a floating-point unit and therefore do not implement the
 412           floating-point instructions in the PowerPC instruction set.  If you
 413           say Y here, the kernel will include code to emulate a floating-point
 414           unit, which will allow programs that use floating-point
 415           instructions to run.
 416
 417           This is also useful to emulate missing (optional) instructions
 418           such as fsqrt on cores that do have an FPU but do not implement
 419           them (such as Freescale BookE).
 420
 421 choice
 422         prompt "Math emulation options"
 423         default MATH_EMULATION_FULL
 424         depends on MATH_EMULATION
 425
 426 config  MATH_EMULATION_FULL
 427         bool "Emulate all the floating point instructions"
 428         ---help---
 429           Select this option will enable the kernel to support to emulate
 430           all the floating point instructions. If your SoC doesn't have
 431           a FPU, you should select this.
 432
 433 config MATH_EMULATION_HW_UNIMPLEMENTED
 434         bool "Just emulate the FPU unimplemented instructions"
 435         ---help---
 436           Select this if you know there does have a hardware FPU on your
 437           SoC, but some floating point instructions are not implemented by that.
 438
 439 endchoice
 440
 441 config PPC_TRANSACTIONAL_MEM
 442        bool "Transactional Memory support for POWERPC"
 443        depends on PPC_BOOK3S_64
 444        depends on SMP
 445        select ALTIVEC
 446        select VSX
 447        default n
 448        ---help---
 449          Support user-mode Transactional Memory on POWERPC.
 450
 451 config LD_HEAD_STUB_CATCH
 452         bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
 453         depends on PPC64
 454         default n
 455         help
 456           Very large kernels can cause linker branch stubs to be generated by
 457           code in head_64.S, which moves the head text sections out of their
 458           specified location. This option can work around the problem.
 459
 460           If unsure, say "N".
 461
 462 config DISABLE_MPROFILE_KERNEL
 463         bool "Disable use of mprofile-kernel for kernel tracing"
 464         depends on PPC64 && CPU_LITTLE_ENDIAN
 465         default y
 466         help
 467           Selecting this options disables use of the mprofile-kernel ABI for
 468           kernel tracing. That will cause options such as live patching
 469           (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
 470           be disabled also.
 471
 472           If you have a toolchain which supports mprofile-kernel, then you can
 473           disable this. Otherwise leave it enabled. If you're not sure, say
 474           "Y".
 475
 476 config MPROFILE_KERNEL
 477         depends on PPC64 && CPU_LITTLE_ENDIAN
 478         def_bool !DISABLE_MPROFILE_KERNEL
 479
 480 config IOMMU_HELPER
 481         def_bool PPC64
 482
 483 config SWIOTLB
 484         bool "SWIOTLB support"
 485         default n
 486         select IOMMU_HELPER
 487         ---help---
 488           Support for IO bounce buffering for systems without an IOMMU.
 489           This allows us to DMA to the full physical address space on
 490           platforms where the size of a physical address is larger
 491           than the bus address.  Not all platforms support this.
 492
 493 config HOTPLUG_CPU
 494         bool "Support for enabling/disabling CPUs"
 495         depends on SMP && (PPC_PSERIES || \
 496         PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
 497         ---help---
 498           Say Y here to be able to disable and re-enable individual
 499           CPUs at runtime on SMP machines.
 500
 501           Say N if you are unsure.
 502
 503 config ARCH_CPU_PROBE_RELEASE
 504         def_bool y
 505         depends on HOTPLUG_CPU
 506
 507 config ARCH_ENABLE_MEMORY_HOTPLUG
 508         def_bool y
 509
 510 config ARCH_HAS_WALK_MEMORY
 511         def_bool y
 512
 513 config ARCH_ENABLE_MEMORY_HOTREMOVE
 514         def_bool y
 515
 516 config PPC64_SUPPORTS_MEMORY_FAILURE
 517         bool "Add support for memory hwpoison"
 518         depends on PPC_BOOK3S_64
 519         default "y" if PPC_POWERNV
 520         select ARCH_SUPPORTS_MEMORY_FAILURE
 521
 522 config KEXEC
 523         bool "kexec system call"
 524         depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
 525         select KEXEC_CORE
 526         help
 527           kexec is a system call that implements the ability to shutdown your
 528           current kernel, and to start another kernel.  It is like a reboot
 529           but it is independent of the system firmware.   And like a reboot
 530           you can start any kernel with it, not just Linux.
 531
 532           The name comes from the similarity to the exec system call.
 533
 534           It is an ongoing process to be certain the hardware in a machine
 535           is properly shutdown, so do not be surprised if this code does not
 536           initially work for you.  As of this writing the exact hardware
 537           interface is strongly in flux, so no good recommendation can be
 538           made.
 539
 540 config KEXEC_FILE
 541         bool "kexec file based system call"
 542         select KEXEC_CORE
 543         select HAVE_IMA_KEXEC
 544         select BUILD_BIN2C
 545         depends on PPC64
 546         depends on CRYPTO=y
 547         depends on CRYPTO_SHA256=y
 548         help
 549           This is a new version of the kexec system call. This call is
 550           file based and takes in file descriptors as system call arguments
 551           for kernel and initramfs as opposed to a list of segments as is the
 552           case for the older kexec call.
 553
 554 config RELOCATABLE
 555         bool "Build a relocatable kernel"
 556         depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
 557         select NONSTATIC_KERNEL
 558         select MODULE_REL_CRCS if MODVERSIONS
 559         help
 560           This builds a kernel image that is capable of running at the
 561           location the kernel is loaded at. For ppc32, there is no any
 562           alignment restrictions, and this feature is a superset of
 563           DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
 564           16k-aligned base address. The kernel is linked as a
 565           position-independent executable (PIE) and contains dynamic relocations
 566           which are processed early in the bootup process.
 567
 568           One use is for the kexec on panic case where the recovery kernel
 569           must live at a different physical address than the primary
 570           kernel.
 571
 572           Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
 573           it has been loaded at and the compile time physical addresses
 574           CONFIG_PHYSICAL_START is ignored.  However CONFIG_PHYSICAL_START
 575           setting can still be useful to bootwrappers that need to know the
 576           load address of the kernel (eg. u-boot/mkimage).
 577
 578 config RELOCATABLE_TEST
 579         bool "Test relocatable kernel"
 580         depends on (PPC64 && RELOCATABLE)
 581         default n
 582         help
 583           This runs the relocatable kernel at the address it was initially
 584           loaded at, which tends to be non-zero and therefore test the
 585           relocation code.
 586
 587 config CRASH_DUMP
 588         bool "Build a dump capture kernel"
 589         depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
 590         select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
 591         help
 592           Build a kernel suitable for use as a dump capture kernel.
 593           The same kernel binary can be used as production kernel and dump
 594           capture kernel.
 595
 596 config FA_DUMP
 597         bool "Firmware-assisted dump"
 598         depends on PPC64 && PPC_RTAS
 599         select CRASH_CORE
 600         select CRASH_DUMP
 601         help
 602           A robust mechanism to get reliable kernel crash dump with
 603           assistance from firmware. This approach does not use kexec,
 604           instead firmware assists in booting the capture kernel
 605           while preserving memory contents. Firmware-assisted dump
 606           is meant to be a kdump replacement offering robustness and
 607           speed not possible without system firmware assistance.
 608
 609           If unsure, say "N"
 610
 611 config IRQ_ALL_CPUS
 612         bool "Distribute interrupts on all CPUs by default"
 613         depends on SMP
 614         help
 615           This option gives the kernel permission to distribute IRQs across
 616           multiple CPUs.  Saying N here will route all IRQs to the first
 617           CPU.  Generally saying Y is safe, although some problems have been
 618           reported with SMP Power Macintoshes with this option enabled.
 619
 620 config NUMA
 621         bool "NUMA support"
 622         depends on PPC64
 623         default y if SMP && PPC_PSERIES
 624
 625 config NODES_SHIFT
 626         int
 627         default "8" if PPC64
 628         default "4"
 629         depends on NEED_MULTIPLE_NODES
 630
 631 config USE_PERCPU_NUMA_NODE_ID
 632         def_bool y
 633         depends on NUMA
 634
 635 config HAVE_MEMORYLESS_NODES
 636         def_bool y
 637         depends on NUMA
 638
 639 config ARCH_SELECT_MEMORY_MODEL
 640         def_bool y
 641         depends on PPC64
 642
 643 config ARCH_FLATMEM_ENABLE
 644         def_bool y
 645         depends on (PPC64 && !NUMA) || PPC32
 646
 647 config ARCH_SPARSEMEM_ENABLE
 648         def_bool y
 649         depends on PPC64
 650         select SPARSEMEM_VMEMMAP_ENABLE
 651
 652 config ARCH_SPARSEMEM_DEFAULT
 653         def_bool y
 654         depends on PPC_BOOK3S_64
 655
 656 config SYS_SUPPORTS_HUGETLBFS
 657         bool
 658
 659 config ILLEGAL_POINTER_VALUE
 660         hex
 661         # This is roughly half way between the top of user space and the bottom
 662         # of kernel space, which seems about as good as we can get.
 663         default 0x5deadbeef0000000 if PPC64
 664         default 0
 665
 666 source "mm/Kconfig"
 667
 668 config ARCH_MEMORY_PROBE
 669         def_bool y
 670         depends on MEMORY_HOTPLUG
 671
 672 # Some NUMA nodes have memory ranges that span
 673 # other nodes.  Even though a pfn is valid and
 674 # between a node's start and end pfns, it may not
 675 # reside on that node.  See memmap_init_zone()
 676 # for details.
 677 config NODES_SPAN_OTHER_NODES
 678         def_bool y
 679         depends on NEED_MULTIPLE_NODES
 680
 681 config STDBINUTILS
 682         bool "Using standard binutils settings"
 683         depends on 44x
 684         default y
 685         help
 686           Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
 687           Note, that kernel will be able to run only those applications,
 688           which had been compiled using binutils later than 2.17.50.0.3 with
 689           '-zmax-page-size' set to 256K (the default is 64K). Or, if using
 690           the older binutils, you can patch them with a trivial patch, which
 691           changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
 692
 693 choice
 694         prompt "Page size"
 695         default PPC_4K_PAGES
 696         help
 697           Select the kernel logical page size. Increasing the page size
 698           will reduce software overhead at each page boundary, allow
 699           hardware prefetch mechanisms to be more effective, and allow
 700           larger dma transfers increasing IO efficiency and reducing
 701           overhead. However the utilization of memory will increase.
 702           For example, each cached file will using a multiple of the
 703           page size to hold its contents and the difference between the
 704           end of file and the end of page is wasted.
 705
 706           Some dedicated systems, such as software raid serving with
 707           accelerated calculations, have shown significant increases.
 708
 709           If you configure a 64 bit kernel for 64k pages but the
 710           processor does not support them, then the kernel will simulate
 711           them with 4k pages, loading them on demand, but with the
 712           reduced software overhead and larger internal fragmentation.
 713           For the 32 bit kernel, a large page option will not be offered
 714           unless it is supported by the configured processor.
 715
 716           If unsure, choose 4K_PAGES.
 717
 718 config PPC_4K_PAGES
 719         bool "4k page size"
 720         select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
 721
 722 config PPC_16K_PAGES
 723         bool "16k page size"
 724         depends on 44x || PPC_8xx
 725
 726 config PPC_64K_PAGES
 727         bool "64k page size"
 728         depends on !PPC_FSL_BOOK3E && (44x || PPC_STD_MMU_64 || PPC_BOOK3E_64)
 729         select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
 730
 731 config PPC_256K_PAGES
 732         bool "256k page size"
 733         depends on 44x && !STDBINUTILS
 734         help
 735           Make the page size 256k.
 736
 737           As the ELF standard only requires alignment to support page
 738           sizes up to 64k, you will need to compile all of your user
 739           space applications with a non-standard binutils settings
 740           (see the STDBINUTILS description for details).
 741
 742           Say N unless you know what you are doing.
 743
 744 endchoice
 745
 746 config THREAD_SHIFT
 747         int "Thread shift" if EXPERT
 748         range 13 15
 749         default "15" if PPC_256K_PAGES
 750         default "14" if PPC64
 751         default "13"
 752         help
 753           Used to define the stack size. The default is almost always what you
 754           want. Only change this if you know what you are doing.
 755
 756 config FORCE_MAX_ZONEORDER
 757         int "Maximum zone order"
 758         range 8 9 if PPC64 && PPC_64K_PAGES
 759         default "9" if PPC64 && PPC_64K_PAGES
 760         range 13 13 if PPC64 && !PPC_64K_PAGES
 761         default "13" if PPC64 && !PPC_64K_PAGES
 762         range 9 64 if PPC32 && PPC_16K_PAGES
 763         default "9" if PPC32 && PPC_16K_PAGES
 764         range 7 64 if PPC32 && PPC_64K_PAGES
 765         default "7" if PPC32 && PPC_64K_PAGES
 766         range 5 64 if PPC32 && PPC_256K_PAGES
 767         default "5" if PPC32 && PPC_256K_PAGES
 768         range 11 64
 769         default "11"
 770         help
 771           The kernel memory allocator divides physically contiguous memory
 772           blocks into "zones", where each zone is a power of two number of
 773           pages.  This option selects the largest power of two that the kernel
 774           keeps in the memory allocator.  If you need to allocate very large
 775           blocks of physically contiguous memory, then you may need to
 776           increase this value.
 777
 778           This config option is actually maximum order plus one. For example,
 779           a value of 11 means that the largest free memory block is 2^10 pages.
 780
 781           The page size is not necessarily 4KB.  For example, on 64-bit
 782           systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES.  Keep
 783           this in mind when choosing a value for this option.
 784
 785 config PPC_SUBPAGE_PROT
 786         bool "Support setting protections for 4k subpages"
 787         depends on PPC_STD_MMU_64 && PPC_64K_PAGES
 788         help
 789           This option adds support for a system call to allow user programs
 790           to set access permissions (read/write, readonly, or no access)
 791           on the 4k subpages of each 64k page.
 792
 793 config PPC_COPRO_BASE
 794         bool
 795         default n
 796
 797 config SCHED_SMT
 798         bool "SMT (Hyperthreading) scheduler support"
 799         depends on PPC64 && SMP
 800         help
 801           SMT scheduler support improves the CPU scheduler's decision making
 802           when dealing with POWER5 cpus at a cost of slightly increased
 803           overhead in some places. If unsure say N here.
 804
 805 config PPC_DENORMALISATION
 806         bool "PowerPC denormalisation exception handling"
 807         depends on PPC_BOOK3S_64
 808         default "y" if PPC_POWERNV
 809         ---help---
 810           Add support for handling denormalisation of single precision
 811           values.  Useful for bare metal only.  If unsure say Y here.
 812
 813 config CMDLINE_BOOL
 814         bool "Default bootloader kernel arguments"
 815
 816 config CMDLINE
 817         string "Initial kernel command string"
 818         depends on CMDLINE_BOOL
 819         default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
 820         help
 821           On some platforms, there is currently no way for the boot loader to
 822           pass arguments to the kernel. For these platforms, you can supply
 823           some command-line options at build time by entering them here.  In
 824           most cases you will need to specify the root device here.
 825
 826 config CMDLINE_FORCE
 827         bool "Always use the default kernel command string"
 828         depends on CMDLINE_BOOL
 829         help
 830           Always use the default kernel command string, even if the boot
 831           loader passes other arguments to the kernel.
 832           This is useful if you cannot or don't want to change the
 833           command-line options your boot loader passes to the kernel.
 834
 835 config EXTRA_TARGETS
 836         string "Additional default image types"
 837         help
 838           List additional targets to be built by the bootwrapper here (separated
 839           by spaces).  This is useful for targets that depend of device tree
 840           files in the .dts directory.
 841
 842           Targets in this list will be build as part of the default build
 843           target, or when the user does a 'make zImage' or a
 844           'make zImage.initrd'.
 845
 846           If unsure, leave blank
 847
 848 config ARCH_WANTS_FREEZER_CONTROL
 849         def_bool y
 850         depends on ADB_PMU
 851
 852 source kernel/power/Kconfig
 853
 854 config SECCOMP
 855         bool "Enable seccomp to safely compute untrusted bytecode"
 856         depends on PROC_FS
 857         default y
 858         help
 859           This kernel feature is useful for number crunching applications
 860           that may need to compute untrusted bytecode during their
 861           execution. By using pipes or other transports made available to
 862           the process as file descriptors supporting the read/write
 863           syscalls, it's possible to isolate those applications in
 864           their own address space using seccomp. Once seccomp is
 865           enabled via /proc/<pid>/seccomp, it cannot be disabled
 866           and the task is only allowed to execute a few safe syscalls
 867           defined by each seccomp mode.
 868
 869           If unsure, say Y. Only embedded should say N here.
 870
 871 endmenu
 872
 873 config ISA_DMA_API
 874         bool
 875         default PCI
 876
 877 menu "Bus options"
 878
 879 config ISA
 880         bool "Support for ISA-bus hardware"
 881         depends on PPC_CHRP
 882         select PPC_I8259
 883         help
 884           Find out whether you have ISA slots on your motherboard.  ISA is the
 885           name of a bus system, i.e. the way the CPU talks to the other stuff
 886           inside your box.  If you have an Apple machine, say N here; if you
 887           have an IBM RS/6000 or pSeries machine, say Y.  If you have an
 888           embedded board, consult your board documentation.
 889
 890 config ZONE_DMA
 891         bool
 892         default y
 893
 894 config NEED_DMA_MAP_STATE
 895         def_bool (PPC64 || NOT_COHERENT_CACHE)
 896
 897 config NEED_SG_DMA_LENGTH
 898         def_bool y
 899
 900 config GENERIC_ISA_DMA
 901         bool
 902         depends on ISA_DMA_API
 903         default y
 904
 905 config PPC_INDIRECT_PCI
 906         bool
 907         depends on PCI
 908         default y if 40x || 44x
 909         default n
 910
 911 config EISA
 912         bool
 913
 914 config SBUS
 915         bool
 916
 917 config FSL_SOC
 918         bool
 919
 920 config FSL_PCI
 921         bool
 922         select PPC_INDIRECT_PCI
 923         select PCI_QUIRKS
 924
 925 config FSL_PMC
 926         bool
 927         default y
 928         depends on SUSPEND && (PPC_85xx || PPC_86xx)
 929         help
 930           Freescale MPC85xx/MPC86xx power management controller support
 931           (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
 932
 933 config PPC4xx_CPM
 934         bool
 935         default y
 936         depends on SUSPEND && (44x || 40x)
 937         help
 938           PPC4xx Clock Power Management (CPM) support (suspend/resume).
 939           It also enables support for two different idle states (idle-wait
 940           and idle-doze).
 941
 942 config 4xx_SOC
 943         bool
 944
 945 config FSL_LBC
 946         bool "Freescale Local Bus support"
 947         help
 948           Enables reporting of errors from the Freescale local bus
 949           controller.  Also contains some common code used by
 950           drivers for specific local bus peripherals.
 951
 952 config FSL_GTM
 953         bool
 954         depends on PPC_83xx || QUICC_ENGINE || CPM2
 955         help
 956           Freescale General-purpose Timers support
 957
 958 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
 959 config MCA
 960         bool
 961
 962 # Platforms that what PCI turned unconditionally just do select PCI
 963 # in their config node.  Platforms that want to choose at config
 964 # time should select PPC_PCI_CHOICE
 965 config PPC_PCI_CHOICE
 966         bool
 967
 968 config PCI
 969         bool "PCI support" if PPC_PCI_CHOICE
 970         default y if !40x && !CPM2 && !8xx && !PPC_83xx \
 971                 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
 972         default PCI_QSPAN if !4xx && !CPM2 && 8xx
 973         select GENERIC_PCI_IOMAP
 974         help
 975           Find out whether your system includes a PCI bus. PCI is the name of
 976           a bus system, i.e. the way the CPU talks to the other stuff inside
 977           your box.  If you say Y here, the kernel will include drivers and
 978           infrastructure code to support PCI bus devices.
 979
 980 config PCI_DOMAINS
 981         def_bool PCI
 982
 983 config PCI_SYSCALL
 984         def_bool PCI
 985
 986 config PCI_QSPAN
 987         bool "QSpan PCI"
 988         depends on !4xx && !CPM2 && 8xx
 989         select PPC_I8259
 990         help
 991           Say Y here if you have a system based on a Motorola 8xx-series
 992           embedded processor with a QSPAN PCI interface, otherwise say N.
 993
 994 config PCI_8260
 995         bool
 996         depends on PCI && 8260
 997         select PPC_INDIRECT_PCI
 998         default y
 999
1000 source "drivers/pci/Kconfig"
1001
1002 source "drivers/pcmcia/Kconfig"
1003
1004 config HAS_RAPIDIO
1005         bool
1006         default n
1007
1008 config RAPIDIO
1009         tristate "RapidIO support"
1010         depends on HAS_RAPIDIO || PCI
1011         help
1012           If you say Y here, the kernel will include drivers and
1013           infrastructure code to support RapidIO interconnect devices.
1014
1015 config FSL_RIO
1016         bool "Freescale Embedded SRIO Controller support"
1017         depends on RAPIDIO = y && HAS_RAPIDIO
1018         default "n"
1019         ---help---
1020           Include support for RapidIO controller on Freescale embedded
1021           processors (MPC8548, MPC8641, etc).
1022
1023 source "drivers/rapidio/Kconfig"
1024
1025 endmenu
1026
1027 config NONSTATIC_KERNEL
1028         bool
1029         default n
1030
1031 menu "Advanced setup"
1032         depends on PPC32
1033
1034 config ADVANCED_OPTIONS
1035         bool "Prompt for advanced kernel configuration options"
1036         help
1037           This option will enable prompting for a variety of advanced kernel
1038           configuration options.  These options can cause the kernel to not
1039           work if they are set incorrectly, but can be used to optimize certain
1040           aspects of kernel memory management.
1041
1042           Unless you know what you are doing, say N here.
1043
1044 comment "Default settings for advanced configuration options are used"
1045         depends on !ADVANCED_OPTIONS
1046
1047 config LOWMEM_SIZE_BOOL
1048         bool "Set maximum low memory"
1049         depends on ADVANCED_OPTIONS
1050         help
1051           This option allows you to set the maximum amount of memory which
1052           will be used as "low memory", that is, memory which the kernel can
1053           access directly, without having to set up a kernel virtual mapping.
1054           This can be useful in optimizing the layout of kernel virtual
1055           memory.
1056
1057           Say N here unless you know what you are doing.
1058
1059 config LOWMEM_SIZE
1060         hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1061         default "0x30000000"
1062
1063 config LOWMEM_CAM_NUM_BOOL
1064         bool "Set number of CAMs to use to map low memory"
1065         depends on ADVANCED_OPTIONS && FSL_BOOKE
1066         help
1067           This option allows you to set the maximum number of CAM slots that
1068           will be used to map low memory.  There are a limited number of slots
1069           available and even more limited number that will fit in the L1 MMU.
1070           However, using more entries will allow mapping more low memory.  This
1071           can be useful in optimizing the layout of kernel virtual memory.
1072
1073           Say N here unless you know what you are doing.
1074
1075 config LOWMEM_CAM_NUM
1076         depends on FSL_BOOKE
1077         int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1078         default 3
1079
1080 config DYNAMIC_MEMSTART
1081         bool "Enable page aligned dynamic load address for kernel"
1082         depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1083         select NONSTATIC_KERNEL
1084         help
1085           This option enables the kernel to be loaded at any page aligned
1086           physical address. The kernel creates a mapping from KERNELBASE to
1087           the address where the kernel is loaded. The page size here implies
1088           the TLB page size of the mapping for kernel on the particular platform.
1089           Please refer to the init code for finding the TLB page size.
1090
1091           DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1092           kernel image, where the only restriction is the page aligned kernel
1093           load address. When this option is enabled, the compile time physical
1094           address CONFIG_PHYSICAL_START is ignored.
1095
1096           This option is overridden by CONFIG_RELOCATABLE
1097
1098 config PAGE_OFFSET_BOOL
1099         bool "Set custom page offset address"
1100         depends on ADVANCED_OPTIONS
1101         help
1102           This option allows you to set the kernel virtual address at which
1103           the kernel will map low memory.  This can be useful in optimizing
1104           the virtual memory layout of the system.
1105
1106           Say N here unless you know what you are doing.
1107
1108 config PAGE_OFFSET
1109         hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1110         default "0xc0000000"
1111
1112 config KERNEL_START_BOOL
1113         bool "Set custom kernel base address"
1114         depends on ADVANCED_OPTIONS
1115         help
1116           This option allows you to set the kernel virtual address at which
1117           the kernel will be loaded.  Normally this should match PAGE_OFFSET
1118           however there are times (like kdump) that one might not want them
1119           to be the same.
1120
1121           Say N here unless you know what you are doing.
1122
1123 config KERNEL_START
1124         hex "Virtual address of kernel base" if KERNEL_START_BOOL
1125         default PAGE_OFFSET if PAGE_OFFSET_BOOL
1126         default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1127         default "0xc0000000"
1128
1129 config PHYSICAL_START_BOOL
1130         bool "Set physical address where the kernel is loaded"
1131         depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1132         help
1133           This gives the physical address where the kernel is loaded.
1134
1135           Say N here unless you know what you are doing.
1136
1137 config PHYSICAL_START
1138         hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1139         default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1140         default "0x00000000"
1141
1142 config PHYSICAL_ALIGN
1143         hex
1144         default "0x04000000" if FSL_BOOKE
1145         help
1146           This value puts the alignment restrictions on physical address
1147           where kernel is loaded and run from. Kernel is compiled for an
1148           address which meets above alignment restriction.
1149
1150 config TASK_SIZE_BOOL
1151         bool "Set custom user task size"
1152         depends on ADVANCED_OPTIONS
1153         help
1154           This option allows you to set the amount of virtual address space
1155           allocated to user tasks.  This can be useful in optimizing the
1156           virtual memory layout of the system.
1157
1158           Say N here unless you know what you are doing.
1159
1160 config TASK_SIZE
1161         hex "Size of user task space" if TASK_SIZE_BOOL
1162         default "0x80000000" if PPC_8xx
1163         default "0xc0000000"
1164
1165 config CONSISTENT_SIZE_BOOL
1166         bool "Set custom consistent memory pool size"
1167         depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1168         help
1169           This option allows you to set the size of the
1170           consistent memory pool.  This pool of virtual memory
1171           is used to make consistent memory allocations.
1172
1173 config CONSISTENT_SIZE
1174         hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1175         default "0x00200000" if NOT_COHERENT_CACHE
1176
1177 config PIN_TLB
1178         bool "Pinned Kernel TLBs (860 ONLY)"
1179         depends on ADVANCED_OPTIONS && 8xx
1180
1181 config PIN_TLB_IMMR
1182         bool "Pinned TLB for IMMR"
1183         depends on PIN_TLB
1184         default y
1185 endmenu
1186
1187 if PPC64
1188 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1189 config PAGE_OFFSET
1190         hex
1191         default "0xc000000000000000"
1192 config KERNEL_START
1193         hex
1194         default "0xc000000000000000"
1195 config PHYSICAL_START
1196         hex
1197         default "0x00000000"
1198 endif
1199
1200 config  ARCH_RANDOM
1201         def_bool n
1202
1203 source "net/Kconfig"
1204
1205 source "drivers/Kconfig"
1206
1207 source "fs/Kconfig"
1208
1209 source "lib/Kconfig"
1210
1211 source "arch/powerpc/Kconfig.debug"
1212
1213 source "security/Kconfig"
1214
1215 source "crypto/Kconfig"
1216
1217 config PPC_LIB_RHEAP
1218         bool
1219
1220 source "arch/powerpc/kvm/Kconfig"
1221
1222 source "kernel/livepatch/Kconfig"