arch/powerpc/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0
   2 source "arch/powerpc/platforms/Kconfig.cputype"
   3
   4 config PPC32
   5         bool
   6         default y if !PPC64
   7
   8 config 32BIT
   9         bool
  10         default y if PPC32
  11
  12 config 64BIT
  13         bool
  14         default y if PPC64
  15
  16 config ARCH_PHYS_ADDR_T_64BIT
  17        def_bool PPC64 || PHYS_64BIT
  18
  19 config ARCH_DMA_ADDR_T_64BIT
  20         def_bool ARCH_PHYS_ADDR_T_64BIT
  21
  22 config MMU
  23         bool
  24         default y
  25
  26 config ARCH_MMAP_RND_BITS_MAX
  27         # On Book3S 64, the default virtual address space for 64-bit processes
  28         # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
  29         # 32T of address space (2^45), which should ensure a reasonable gap
  30         # between bottom-up and top-down allocations for applications that
  31         # consume "normal" amounts of address space. Book3S 64 only supports 64K
  32         # and 4K page sizes.
  33         default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
  34         default 33 if PPC_BOOK3S_64                  # 33 = 45 (32T) - 12 (4K)
  35         #
  36         # On all other 64-bit platforms (currently only Book3E), the virtual
  37         # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
  38         # of address space (2^44). Only 4K page sizes are supported.
  39         default 32 if 64BIT     # 32 = 44 (16T) - 12 (4K)
  40         #
  41         # For 32-bit, use the compat values, as they're the same.
  42         default ARCH_MMAP_RND_COMPAT_BITS_MAX
  43
  44 config ARCH_MMAP_RND_BITS_MIN
  45         # Allow randomisation to consume up to 1GB of address space (2^30).
  46         default 14 if 64BIT && PPC_64K_PAGES    # 14 = 30 (1GB) - 16 (64K)
  47         default 18 if 64BIT                     # 18 = 30 (1GB) - 12 (4K)
  48         #
  49         # For 32-bit, use the compat values, as they're the same.
  50         default ARCH_MMAP_RND_COMPAT_BITS_MIN
  51
  52 config ARCH_MMAP_RND_COMPAT_BITS_MAX
  53         # Total virtual address space for 32-bit processes is 2^31 (2GB).
  54         # Allow randomisation to consume up to 512MB of address space (2^29).
  55         default 11 if PPC_256K_PAGES    # 11 = 29 (512MB) - 18 (256K)
  56         default 13 if PPC_64K_PAGES     # 13 = 29 (512MB) - 16 (64K)
  57         default 15 if PPC_16K_PAGES     # 15 = 29 (512MB) - 14 (16K)
  58         default 17                      # 17 = 29 (512MB) - 12 (4K)
  59
  60 config ARCH_MMAP_RND_COMPAT_BITS_MIN
  61         # Total virtual address space for 32-bit processes is 2^31 (2GB).
  62         # Allow randomisation to consume up to 8MB of address space (2^23).
  63         default 5 if PPC_256K_PAGES     #  5 = 23 (8MB) - 18 (256K)
  64         default 7 if PPC_64K_PAGES      #  7 = 23 (8MB) - 16 (64K)
  65         default 9 if PPC_16K_PAGES      #  9 = 23 (8MB) - 14 (16K)
  66         default 11                      # 11 = 23 (8MB) - 12 (4K)
  67
  68 config HAVE_SETUP_PER_CPU_AREA
  69         def_bool PPC64
  70
  71 config NEED_PER_CPU_EMBED_FIRST_CHUNK
  72         def_bool PPC64
  73
  74 config NR_IRQS
  75         int "Number of virtual interrupt numbers"
  76         range 32 32768
  77         default "512"
  78         help
  79           This defines the number of virtual interrupt numbers the kernel
  80           can manage. Virtual interrupt numbers are what you see in
  81           /proc/interrupts. If you configure your system to have too few,
  82           drivers will fail to load or worse - handle with care.
  83
  84 config NMI_IPI
  85         bool
  86         depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
  87         default y
  88
  89 config PPC_WATCHDOG
  90         bool
  91         depends on HARDLOCKUP_DETECTOR
  92         depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
  93         default y
  94         help
  95           This is a placeholder when the powerpc hardlockup detector
  96           watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
  97           seleted via the generic lockup detector menu which is why we
  98           have no standalone config option for it here.
  99
 100 config STACKTRACE_SUPPORT
 101         bool
 102         default y
 103
 104 config TRACE_IRQFLAGS_SUPPORT
 105         bool
 106         default y
 107
 108 config LOCKDEP_SUPPORT
 109         bool
 110         default y
 111
 112 config RWSEM_GENERIC_SPINLOCK
 113         bool
 114
 115 config RWSEM_XCHGADD_ALGORITHM
 116         bool
 117         default y
 118
 119 config GENERIC_LOCKBREAK
 120         bool
 121         default y
 122         depends on SMP && PREEMPT
 123
 124 config GENERIC_HWEIGHT
 125         bool
 126         default y
 127
 128 config ARCH_HAS_DMA_SET_COHERENT_MASK
 129         bool
 130
 131 config PPC
 132         bool
 133         default y
 134         #
 135         # Please keep this list sorted alphabetically.
 136         #
 137         select ARCH_HAS_DEVMEM_IS_ALLOWED
 138         select ARCH_HAS_DMA_SET_COHERENT_MASK
 139         select ARCH_HAS_ELF_RANDOMIZE
 140         select ARCH_HAS_FORTIFY_SOURCE
 141         select ARCH_HAS_GCOV_PROFILE_ALL
 142         select ARCH_HAS_SCALED_CPUTIME          if VIRT_CPU_ACCOUNTING_NATIVE
 143         select ARCH_HAS_SG_CHAIN
 144         select ARCH_HAS_TICK_BROADCAST          if GENERIC_CLOCKEVENTS_BROADCAST
 145         select ARCH_HAS_UBSAN_SANITIZE_ALL
 146         select ARCH_HAS_ZONE_DEVICE             if PPC_BOOK3S_64
 147         select ARCH_HAVE_NMI_SAFE_CMPXCHG
 148         select ARCH_MIGHT_HAVE_PC_PARPORT
 149         select ARCH_MIGHT_HAVE_PC_SERIO
 150         select ARCH_SUPPORTS_ATOMIC_RMW
 151         select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
 152         select ARCH_USE_BUILTIN_BSWAP
 153         select ARCH_USE_CMPXCHG_LOCKREF         if PPC64
 154         select ARCH_WANT_IPC_PARSE_VERSION
 155         select ARCH_WEAK_RELEASE_ACQUIRE
 156         select BINFMT_ELF
 157         select BUILDTIME_EXTABLE_SORT
 158         select CLONE_BACKWARDS
 159         select DCACHE_WORD_ACCESS               if PPC64 && CPU_LITTLE_ENDIAN
 160         select EDAC_ATOMIC_SCRUB
 161         select EDAC_SUPPORT
 162         select GENERIC_ATOMIC64                 if PPC32
 163         select GENERIC_CLOCKEVENTS
 164         select GENERIC_CLOCKEVENTS_BROADCAST    if SMP
 165         select GENERIC_CMOS_UPDATE
 166         select GENERIC_CPU_AUTOPROBE
 167         select GENERIC_IRQ_SHOW
 168         select GENERIC_IRQ_SHOW_LEVEL
 169         select GENERIC_SMP_IDLE_THREAD
 170         select GENERIC_STRNCPY_FROM_USER
 171         select GENERIC_STRNLEN_USER
 172         select GENERIC_TIME_VSYSCALL
 173         select HAVE_ARCH_AUDITSYSCALL
 174         select HAVE_ARCH_JUMP_LABEL
 175         select HAVE_ARCH_KGDB
 176         select HAVE_ARCH_MMAP_RND_BITS
 177         select HAVE_ARCH_MMAP_RND_COMPAT_BITS   if COMPAT
 178         select HAVE_ARCH_SECCOMP_FILTER
 179         select HAVE_ARCH_TRACEHOOK
 180         select ARCH_HAS_STRICT_KERNEL_RWX       if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION)
 181         select ARCH_OPTIONAL_KERNEL_RWX         if ARCH_HAS_STRICT_KERNEL_RWX
 182         select HAVE_CBPF_JIT                    if !PPC64
 183         select HAVE_CONTEXT_TRACKING            if PPC64
 184         select HAVE_DEBUG_KMEMLEAK
 185         select HAVE_DEBUG_STACKOVERFLOW
 186         select HAVE_DMA_API_DEBUG
 187         select HAVE_DYNAMIC_FTRACE
 188         select HAVE_DYNAMIC_FTRACE_WITH_REGS    if MPROFILE_KERNEL
 189         select HAVE_EBPF_JIT                    if PPC64
 190         select HAVE_EFFICIENT_UNALIGNED_ACCESS  if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
 191         select HAVE_FTRACE_MCOUNT_RECORD
 192         select HAVE_FUNCTION_GRAPH_TRACER
 193         select HAVE_FUNCTION_TRACER
 194         select HAVE_GCC_PLUGINS
 195         select HAVE_GENERIC_GUP
 196         select HAVE_HW_BREAKPOINT               if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
 197         select HAVE_IDE
 198         select HAVE_IOREMAP_PROT
 199         select HAVE_IRQ_EXIT_ON_IRQ_STACK
 200         select HAVE_KERNEL_GZIP
 201         select HAVE_KPROBES
 202         select HAVE_KPROBES_ON_FTRACE
 203         select HAVE_KRETPROBES
 204         select HAVE_LIVEPATCH                   if HAVE_DYNAMIC_FTRACE_WITH_REGS
 205         select HAVE_MEMBLOCK
 206         select HAVE_MEMBLOCK_NODE_MAP
 207         select HAVE_MOD_ARCH_SPECIFIC
 208         select HAVE_NMI                         if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
 209         select HAVE_HARDLOCKUP_DETECTOR_ARCH    if (PPC64 && PPC_BOOK3S)
 210         select HAVE_OPROFILE
 211         select HAVE_OPTPROBES                   if PPC64
 212         select HAVE_PERF_EVENTS
 213         select HAVE_PERF_EVENTS_NMI             if PPC64
 214         select HAVE_HARDLOCKUP_DETECTOR_PERF    if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
 215         select HAVE_PERF_REGS
 216         select HAVE_PERF_USER_STACK_DUMP
 217         select HAVE_RCU_TABLE_FREE              if SMP
 218         select HAVE_REGS_AND_STACK_ACCESS_API
 219         select HAVE_SYSCALL_TRACEPOINTS
 220         select HAVE_VIRT_CPU_ACCOUNTING
 221         select HAVE_IRQ_TIME_ACCOUNTING
 222         select IRQ_DOMAIN
 223         select IRQ_FORCED_THREADING
 224         select MODULES_USE_ELF_RELA
 225         select NO_BOOTMEM
 226         select OF
 227         select OF_EARLY_FLATTREE
 228         select OF_RESERVED_MEM
 229         select OLD_SIGACTION                    if PPC32
 230         select OLD_SIGSUSPEND
 231         select SPARSE_IRQ
 232         select SYSCTL_EXCEPTION_TRACE
 233         select VIRT_TO_BUS                      if !PPC64
 234         #
 235         # Please keep this list sorted alphabetically.
 236         #
 237
 238 config GENERIC_CSUM
 239         def_bool n
 240
 241 config EARLY_PRINTK
 242         bool
 243         default y
 244
 245 config PANIC_TIMEOUT
 246         int
 247         default 180
 248
 249 config COMPAT
 250         bool
 251         default y if PPC64
 252         select COMPAT_BINFMT_ELF
 253         select ARCH_WANT_OLD_COMPAT_IPC
 254         select COMPAT_OLD_SIGACTION
 255
 256 config SYSVIPC_COMPAT
 257         bool
 258         depends on COMPAT && SYSVIPC
 259         default y
 260
 261 # All PPC32s use generic nvram driver through ppc_md
 262 config GENERIC_NVRAM
 263         bool
 264         default y if PPC32
 265
 266 config SCHED_OMIT_FRAME_POINTER
 267         bool
 268         default y
 269
 270 config ARCH_MAY_HAVE_PC_FDC
 271         bool
 272         default PCI
 273
 274 config PPC_UDBG_16550
 275         bool
 276         default n
 277
 278 config GENERIC_TBSYNC
 279         bool
 280         default y if PPC32 && SMP
 281         default n
 282
 283 config AUDIT_ARCH
 284         bool
 285         default y
 286
 287 config GENERIC_BUG
 288         bool
 289         default y
 290         depends on BUG
 291
 292 config SYS_SUPPORTS_APM_EMULATION
 293         default y if PMAC_APM_EMU
 294         bool
 295
 296 config EPAPR_BOOT
 297         bool
 298         help
 299           Used to allow a board to specify it wants an ePAPR compliant wrapper.
 300         default n
 301
 302 config DEFAULT_UIMAGE
 303         bool
 304         help
 305           Used to allow a board to specify it wants a uImage built by default
 306         default n
 307
 308 config ARCH_HIBERNATION_POSSIBLE
 309         bool
 310         default y
 311
 312 config ARCH_SUSPEND_POSSIBLE
 313         def_bool y
 314         depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
 315                    (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
 316                    || 44x || 40x
 317
 318 config PPC_DCR_NATIVE
 319         bool
 320         default n
 321
 322 config PPC_DCR_MMIO
 323         bool
 324         default n
 325
 326 config PPC_DCR
 327         bool
 328         depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
 329         default y
 330
 331 config PPC_OF_PLATFORM_PCI
 332         bool
 333         depends on PCI
 334         depends on PPC64 # not supported on 32 bits yet
 335         default n
 336
 337 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
 338         depends on PPC32 || PPC_STD_MMU_64
 339         def_bool y
 340
 341 config ARCH_SUPPORTS_UPROBES
 342         def_bool y
 343
 344 config PPC_ADV_DEBUG_REGS
 345         bool
 346         depends on 40x || BOOKE
 347         default y
 348
 349 config PPC_ADV_DEBUG_IACS
 350         int
 351         depends on PPC_ADV_DEBUG_REGS
 352         default 4 if 44x
 353         default 2
 354
 355 config PPC_ADV_DEBUG_DACS
 356         int
 357         depends on PPC_ADV_DEBUG_REGS
 358         default 2
 359
 360 config PPC_ADV_DEBUG_DVCS
 361         int
 362         depends on PPC_ADV_DEBUG_REGS
 363         default 2 if 44x
 364         default 0
 365
 366 config PPC_ADV_DEBUG_DAC_RANGE
 367         bool
 368         depends on PPC_ADV_DEBUG_REGS && 44x
 369         default y
 370
 371 config ZONE_DMA32
 372         bool
 373         default y if PPC64
 374
 375 config PGTABLE_LEVELS
 376         int
 377         default 2 if !PPC64
 378         default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
 379         default 4
 380
 381 source "init/Kconfig"
 382
 383 source "kernel/Kconfig.freezer"
 384
 385 source "arch/powerpc/sysdev/Kconfig"
 386 source "arch/powerpc/platforms/Kconfig"
 387
 388 menu "Kernel options"
 389
 390 config HIGHMEM
 391         bool "High memory support"
 392         depends on PPC32
 393
 394 source kernel/Kconfig.hz
 395 source kernel/Kconfig.preempt
 396 source "fs/Kconfig.binfmt"
 397
 398 config HUGETLB_PAGE_SIZE_VARIABLE
 399         bool
 400         depends on HUGETLB_PAGE
 401         default y
 402
 403 config MATH_EMULATION
 404         bool "Math emulation"
 405         depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
 406         ---help---
 407           Some PowerPC chips designed for embedded applications do not have
 408           a floating-point unit and therefore do not implement the
 409           floating-point instructions in the PowerPC instruction set.  If you
 410           say Y here, the kernel will include code to emulate a floating-point
 411           unit, which will allow programs that use floating-point
 412           instructions to run.
 413
 414           This is also useful to emulate missing (optional) instructions
 415           such as fsqrt on cores that do have an FPU but do not implement
 416           them (such as Freescale BookE).
 417
 418 choice
 419         prompt "Math emulation options"
 420         default MATH_EMULATION_FULL
 421         depends on MATH_EMULATION
 422
 423 config  MATH_EMULATION_FULL
 424         bool "Emulate all the floating point instructions"
 425         ---help---
 426           Select this option will enable the kernel to support to emulate
 427           all the floating point instructions. If your SoC doesn't have
 428           a FPU, you should select this.
 429
 430 config MATH_EMULATION_HW_UNIMPLEMENTED
 431         bool "Just emulate the FPU unimplemented instructions"
 432         ---help---
 433           Select this if you know there does have a hardware FPU on your
 434           SoC, but some floating point instructions are not implemented by that.
 435
 436 endchoice
 437
 438 config PPC_TRANSACTIONAL_MEM
 439        bool "Transactional Memory support for POWERPC"
 440        depends on PPC_BOOK3S_64
 441        depends on SMP
 442        select ALTIVEC
 443        select VSX
 444        default n
 445        ---help---
 446          Support user-mode Transactional Memory on POWERPC.
 447
 448 config LD_HEAD_STUB_CATCH
 449         bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
 450         depends on PPC64
 451         default n
 452         help
 453           Very large kernels can cause linker branch stubs to be generated by
 454           code in head_64.S, which moves the head text sections out of their
 455           specified location. This option can work around the problem.
 456
 457           If unsure, say "N".
 458
 459 config DISABLE_MPROFILE_KERNEL
 460         bool "Disable use of mprofile-kernel for kernel tracing"
 461         depends on PPC64 && CPU_LITTLE_ENDIAN
 462         default y
 463         help
 464           Selecting this options disables use of the mprofile-kernel ABI for
 465           kernel tracing. That will cause options such as live patching
 466           (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
 467           be disabled also.
 468
 469           If you have a toolchain which supports mprofile-kernel, then you can
 470           disable this. Otherwise leave it enabled. If you're not sure, say
 471           "Y".
 472
 473 config MPROFILE_KERNEL
 474         depends on PPC64 && CPU_LITTLE_ENDIAN
 475         def_bool !DISABLE_MPROFILE_KERNEL
 476
 477 config IOMMU_HELPER
 478         def_bool PPC64
 479
 480 config SWIOTLB
 481         bool "SWIOTLB support"
 482         default n
 483         select IOMMU_HELPER
 484         ---help---
 485           Support for IO bounce buffering for systems without an IOMMU.
 486           This allows us to DMA to the full physical address space on
 487           platforms where the size of a physical address is larger
 488           than the bus address.  Not all platforms support this.
 489
 490 config HOTPLUG_CPU
 491         bool "Support for enabling/disabling CPUs"
 492         depends on SMP && (PPC_PSERIES || \
 493         PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
 494         ---help---
 495           Say Y here to be able to disable and re-enable individual
 496           CPUs at runtime on SMP machines.
 497
 498           Say N if you are unsure.
 499
 500 config ARCH_CPU_PROBE_RELEASE
 501         def_bool y
 502         depends on HOTPLUG_CPU
 503
 504 config ARCH_ENABLE_MEMORY_HOTPLUG
 505         def_bool y
 506
 507 config ARCH_HAS_WALK_MEMORY
 508         def_bool y
 509
 510 config ARCH_ENABLE_MEMORY_HOTREMOVE
 511         def_bool y
 512
 513 config PPC64_SUPPORTS_MEMORY_FAILURE
 514         bool "Add support for memory hwpoison"
 515         depends on PPC_BOOK3S_64
 516         default "y" if PPC_POWERNV
 517         select ARCH_SUPPORTS_MEMORY_FAILURE
 518
 519 config KEXEC
 520         bool "kexec system call"
 521         depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
 522         select KEXEC_CORE
 523         help
 524           kexec is a system call that implements the ability to shutdown your
 525           current kernel, and to start another kernel.  It is like a reboot
 526           but it is independent of the system firmware.   And like a reboot
 527           you can start any kernel with it, not just Linux.
 528
 529           The name comes from the similarity to the exec system call.
 530
 531           It is an ongoing process to be certain the hardware in a machine
 532           is properly shutdown, so do not be surprised if this code does not
 533           initially work for you.  As of this writing the exact hardware
 534           interface is strongly in flux, so no good recommendation can be
 535           made.
 536
 537 config KEXEC_FILE
 538         bool "kexec file based system call"
 539         select KEXEC_CORE
 540         select HAVE_IMA_KEXEC
 541         select BUILD_BIN2C
 542         depends on PPC64
 543         depends on CRYPTO=y
 544         depends on CRYPTO_SHA256=y
 545         help
 546           This is a new version of the kexec system call. This call is
 547           file based and takes in file descriptors as system call arguments
 548           for kernel and initramfs as opposed to a list of segments as is the
 549           case for the older kexec call.
 550
 551 config RELOCATABLE
 552         bool "Build a relocatable kernel"
 553         depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
 554         select NONSTATIC_KERNEL
 555         select MODULE_REL_CRCS if MODVERSIONS
 556         help
 557           This builds a kernel image that is capable of running at the
 558           location the kernel is loaded at. For ppc32, there is no any
 559           alignment restrictions, and this feature is a superset of
 560           DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
 561           16k-aligned base address. The kernel is linked as a
 562           position-independent executable (PIE) and contains dynamic relocations
 563           which are processed early in the bootup process.
 564
 565           One use is for the kexec on panic case where the recovery kernel
 566           must live at a different physical address than the primary
 567           kernel.
 568
 569           Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
 570           it has been loaded at and the compile time physical addresses
 571           CONFIG_PHYSICAL_START is ignored.  However CONFIG_PHYSICAL_START
 572           setting can still be useful to bootwrappers that need to know the
 573           load address of the kernel (eg. u-boot/mkimage).
 574
 575 config RELOCATABLE_TEST
 576         bool "Test relocatable kernel"
 577         depends on (PPC64 && RELOCATABLE)
 578         default n
 579         help
 580           This runs the relocatable kernel at the address it was initially
 581           loaded at, which tends to be non-zero and therefore test the
 582           relocation code.
 583
 584 config CRASH_DUMP
 585         bool "Build a dump capture kernel"
 586         depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
 587         select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
 588         help
 589           Build a kernel suitable for use as a dump capture kernel.
 590           The same kernel binary can be used as production kernel and dump
 591           capture kernel.
 592
 593 config FA_DUMP
 594         bool "Firmware-assisted dump"
 595         depends on PPC64 && PPC_RTAS
 596         select CRASH_CORE
 597         select CRASH_DUMP
 598         help
 599           A robust mechanism to get reliable kernel crash dump with
 600           assistance from firmware. This approach does not use kexec,
 601           instead firmware assists in booting the capture kernel
 602           while preserving memory contents. Firmware-assisted dump
 603           is meant to be a kdump replacement offering robustness and
 604           speed not possible without system firmware assistance.
 605
 606           If unsure, say "N"
 607
 608 config IRQ_ALL_CPUS
 609         bool "Distribute interrupts on all CPUs by default"
 610         depends on SMP
 611         help
 612           This option gives the kernel permission to distribute IRQs across
 613           multiple CPUs.  Saying N here will route all IRQs to the first
 614           CPU.  Generally saying Y is safe, although some problems have been
 615           reported with SMP Power Macintoshes with this option enabled.
 616
 617 config NUMA
 618         bool "NUMA support"
 619         depends on PPC64
 620         default y if SMP && PPC_PSERIES
 621
 622 config NODES_SHIFT
 623         int
 624         default "8" if PPC64
 625         default "4"
 626         depends on NEED_MULTIPLE_NODES
 627
 628 config USE_PERCPU_NUMA_NODE_ID
 629         def_bool y
 630         depends on NUMA
 631
 632 config HAVE_MEMORYLESS_NODES
 633         def_bool y
 634         depends on NUMA
 635
 636 config ARCH_SELECT_MEMORY_MODEL
 637         def_bool y
 638         depends on PPC64
 639
 640 config ARCH_FLATMEM_ENABLE
 641         def_bool y
 642         depends on (PPC64 && !NUMA) || PPC32
 643
 644 config ARCH_SPARSEMEM_ENABLE
 645         def_bool y
 646         depends on PPC64
 647         select SPARSEMEM_VMEMMAP_ENABLE
 648
 649 config ARCH_SPARSEMEM_DEFAULT
 650         def_bool y
 651         depends on PPC_BOOK3S_64
 652
 653 config SYS_SUPPORTS_HUGETLBFS
 654         bool
 655
 656 config ILLEGAL_POINTER_VALUE
 657         hex
 658         # This is roughly half way between the top of user space and the bottom
 659         # of kernel space, which seems about as good as we can get.
 660         default 0x5deadbeef0000000 if PPC64
 661         default 0
 662
 663 source "mm/Kconfig"
 664
 665 config ARCH_MEMORY_PROBE
 666         def_bool y
 667         depends on MEMORY_HOTPLUG
 668
 669 # Some NUMA nodes have memory ranges that span
 670 # other nodes.  Even though a pfn is valid and
 671 # between a node's start and end pfns, it may not
 672 # reside on that node.  See memmap_init_zone()
 673 # for details.
 674 config NODES_SPAN_OTHER_NODES
 675         def_bool y
 676         depends on NEED_MULTIPLE_NODES
 677
 678 config STDBINUTILS
 679         bool "Using standard binutils settings"
 680         depends on 44x
 681         default y
 682         help
 683           Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
 684           Note, that kernel will be able to run only those applications,
 685           which had been compiled using binutils later than 2.17.50.0.3 with
 686           '-zmax-page-size' set to 256K (the default is 64K). Or, if using
 687           the older binutils, you can patch them with a trivial patch, which
 688           changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
 689
 690 choice
 691         prompt "Page size"
 692         default PPC_4K_PAGES
 693         help
 694           Select the kernel logical page size. Increasing the page size
 695           will reduce software overhead at each page boundary, allow
 696           hardware prefetch mechanisms to be more effective, and allow
 697           larger dma transfers increasing IO efficiency and reducing
 698           overhead. However the utilization of memory will increase.
 699           For example, each cached file will using a multiple of the
 700           page size to hold its contents and the difference between the
 701           end of file and the end of page is wasted.
 702
 703           Some dedicated systems, such as software raid serving with
 704           accelerated calculations, have shown significant increases.
 705
 706           If you configure a 64 bit kernel for 64k pages but the
 707           processor does not support them, then the kernel will simulate
 708           them with 4k pages, loading them on demand, but with the
 709           reduced software overhead and larger internal fragmentation.
 710           For the 32 bit kernel, a large page option will not be offered
 711           unless it is supported by the configured processor.
 712
 713           If unsure, choose 4K_PAGES.
 714
 715 config PPC_4K_PAGES
 716         bool "4k page size"
 717         select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
 718
 719 config PPC_16K_PAGES
 720         bool "16k page size"
 721         depends on 44x || PPC_8xx
 722
 723 config PPC_64K_PAGES
 724         bool "64k page size"
 725         depends on !PPC_FSL_BOOK3E && (44x || PPC_STD_MMU_64 || PPC_BOOK3E_64)
 726         select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
 727
 728 config PPC_256K_PAGES
 729         bool "256k page size"
 730         depends on 44x && !STDBINUTILS
 731         help
 732           Make the page size 256k.
 733
 734           As the ELF standard only requires alignment to support page
 735           sizes up to 64k, you will need to compile all of your user
 736           space applications with a non-standard binutils settings
 737           (see the STDBINUTILS description for details).
 738
 739           Say N unless you know what you are doing.
 740
 741 endchoice
 742
 743 config THREAD_SHIFT
 744         int "Thread shift" if EXPERT
 745         range 13 15
 746         default "15" if PPC_256K_PAGES
 747         default "14" if PPC64
 748         default "13"
 749         help
 750           Used to define the stack size. The default is almost always what you
 751           want. Only change this if you know what you are doing.
 752
 753 config FORCE_MAX_ZONEORDER
 754         int "Maximum zone order"
 755         range 8 9 if PPC64 && PPC_64K_PAGES
 756         default "9" if PPC64 && PPC_64K_PAGES
 757         range 13 13 if PPC64 && !PPC_64K_PAGES
 758         default "13" if PPC64 && !PPC_64K_PAGES
 759         range 9 64 if PPC32 && PPC_16K_PAGES
 760         default "9" if PPC32 && PPC_16K_PAGES
 761         range 7 64 if PPC32 && PPC_64K_PAGES
 762         default "7" if PPC32 && PPC_64K_PAGES
 763         range 5 64 if PPC32 && PPC_256K_PAGES
 764         default "5" if PPC32 && PPC_256K_PAGES
 765         range 11 64
 766         default "11"
 767         help
 768           The kernel memory allocator divides physically contiguous memory
 769           blocks into "zones", where each zone is a power of two number of
 770           pages.  This option selects the largest power of two that the kernel
 771           keeps in the memory allocator.  If you need to allocate very large
 772           blocks of physically contiguous memory, then you may need to
 773           increase this value.
 774
 775           This config option is actually maximum order plus one. For example,
 776           a value of 11 means that the largest free memory block is 2^10 pages.
 777
 778           The page size is not necessarily 4KB.  For example, on 64-bit
 779           systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES.  Keep
 780           this in mind when choosing a value for this option.
 781
 782 config PPC_SUBPAGE_PROT
 783         bool "Support setting protections for 4k subpages"
 784         depends on PPC_STD_MMU_64 && PPC_64K_PAGES
 785         help
 786           This option adds support for a system call to allow user programs
 787           to set access permissions (read/write, readonly, or no access)
 788           on the 4k subpages of each 64k page.
 789
 790 config PPC_COPRO_BASE
 791         bool
 792         default n
 793
 794 config SCHED_SMT
 795         bool "SMT (Hyperthreading) scheduler support"
 796         depends on PPC64 && SMP
 797         help
 798           SMT scheduler support improves the CPU scheduler's decision making
 799           when dealing with POWER5 cpus at a cost of slightly increased
 800           overhead in some places. If unsure say N here.
 801
 802 config PPC_DENORMALISATION
 803         bool "PowerPC denormalisation exception handling"
 804         depends on PPC_BOOK3S_64
 805         default "y" if PPC_POWERNV
 806         ---help---
 807           Add support for handling denormalisation of single precision
 808           values.  Useful for bare metal only.  If unsure say Y here.
 809
 810 config CMDLINE_BOOL
 811         bool "Default bootloader kernel arguments"
 812
 813 config CMDLINE
 814         string "Initial kernel command string"
 815         depends on CMDLINE_BOOL
 816         default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
 817         help
 818           On some platforms, there is currently no way for the boot loader to
 819           pass arguments to the kernel. For these platforms, you can supply
 820           some command-line options at build time by entering them here.  In
 821           most cases you will need to specify the root device here.
 822
 823 config CMDLINE_FORCE
 824         bool "Always use the default kernel command string"
 825         depends on CMDLINE_BOOL
 826         help
 827           Always use the default kernel command string, even if the boot
 828           loader passes other arguments to the kernel.
 829           This is useful if you cannot or don't want to change the
 830           command-line options your boot loader passes to the kernel.
 831
 832 config EXTRA_TARGETS
 833         string "Additional default image types"
 834         help
 835           List additional targets to be built by the bootwrapper here (separated
 836           by spaces).  This is useful for targets that depend of device tree
 837           files in the .dts directory.
 838
 839           Targets in this list will be build as part of the default build
 840           target, or when the user does a 'make zImage' or a
 841           'make zImage.initrd'.
 842
 843           If unsure, leave blank
 844
 845 config ARCH_WANTS_FREEZER_CONTROL
 846         def_bool y
 847         depends on ADB_PMU
 848
 849 source kernel/power/Kconfig
 850
 851 config SECCOMP
 852         bool "Enable seccomp to safely compute untrusted bytecode"
 853         depends on PROC_FS
 854         default y
 855         help
 856           This kernel feature is useful for number crunching applications
 857           that may need to compute untrusted bytecode during their
 858           execution. By using pipes or other transports made available to
 859           the process as file descriptors supporting the read/write
 860           syscalls, it's possible to isolate those applications in
 861           their own address space using seccomp. Once seccomp is
 862           enabled via /proc/<pid>/seccomp, it cannot be disabled
 863           and the task is only allowed to execute a few safe syscalls
 864           defined by each seccomp mode.
 865
 866           If unsure, say Y. Only embedded should say N here.
 867
 868 endmenu
 869
 870 config ISA_DMA_API
 871         bool
 872         default PCI
 873
 874 menu "Bus options"
 875
 876 config ISA
 877         bool "Support for ISA-bus hardware"
 878         depends on PPC_CHRP
 879         select PPC_I8259
 880         help
 881           Find out whether you have ISA slots on your motherboard.  ISA is the
 882           name of a bus system, i.e. the way the CPU talks to the other stuff
 883           inside your box.  If you have an Apple machine, say N here; if you
 884           have an IBM RS/6000 or pSeries machine, say Y.  If you have an
 885           embedded board, consult your board documentation.
 886
 887 config ZONE_DMA
 888         bool
 889         default y
 890
 891 config NEED_DMA_MAP_STATE
 892         def_bool (PPC64 || NOT_COHERENT_CACHE)
 893
 894 config NEED_SG_DMA_LENGTH
 895         def_bool y
 896
 897 config GENERIC_ISA_DMA
 898         bool
 899         depends on ISA_DMA_API
 900         default y
 901
 902 config PPC_INDIRECT_PCI
 903         bool
 904         depends on PCI
 905         default y if 40x || 44x
 906         default n
 907
 908 config EISA
 909         bool
 910
 911 config SBUS
 912         bool
 913
 914 config FSL_SOC
 915         bool
 916
 917 config FSL_PCI
 918         bool
 919         select PPC_INDIRECT_PCI
 920         select PCI_QUIRKS
 921
 922 config FSL_PMC
 923         bool
 924         default y
 925         depends on SUSPEND && (PPC_85xx || PPC_86xx)
 926         help
 927           Freescale MPC85xx/MPC86xx power management controller support
 928           (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
 929
 930 config PPC4xx_CPM
 931         bool
 932         default y
 933         depends on SUSPEND && (44x || 40x)
 934         help
 935           PPC4xx Clock Power Management (CPM) support (suspend/resume).
 936           It also enables support for two different idle states (idle-wait
 937           and idle-doze).
 938
 939 config 4xx_SOC
 940         bool
 941
 942 config FSL_LBC
 943         bool "Freescale Local Bus support"
 944         help
 945           Enables reporting of errors from the Freescale local bus
 946           controller.  Also contains some common code used by
 947           drivers for specific local bus peripherals.
 948
 949 config FSL_GTM
 950         bool
 951         depends on PPC_83xx || QUICC_ENGINE || CPM2
 952         help
 953           Freescale General-purpose Timers support
 954
 955 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
 956 config MCA
 957         bool
 958
 959 # Platforms that what PCI turned unconditionally just do select PCI
 960 # in their config node.  Platforms that want to choose at config
 961 # time should select PPC_PCI_CHOICE
 962 config PPC_PCI_CHOICE
 963         bool
 964
 965 config PCI
 966         bool "PCI support" if PPC_PCI_CHOICE
 967         default y if !40x && !CPM2 && !PPC_8xx && !PPC_83xx \
 968                 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
 969         default PCI_QSPAN if PPC_8xx
 970         select GENERIC_PCI_IOMAP
 971         help
 972           Find out whether your system includes a PCI bus. PCI is the name of
 973           a bus system, i.e. the way the CPU talks to the other stuff inside
 974           your box.  If you say Y here, the kernel will include drivers and
 975           infrastructure code to support PCI bus devices.
 976
 977 config PCI_DOMAINS
 978         def_bool PCI
 979
 980 config PCI_SYSCALL
 981         def_bool PCI
 982
 983 config PCI_QSPAN
 984         bool "QSpan PCI"
 985         depends on PPC_8xx
 986         select PPC_I8259
 987         help
 988           Say Y here if you have a system based on a Motorola 8xx-series
 989           embedded processor with a QSPAN PCI interface, otherwise say N.
 990
 991 config PCI_8260
 992         bool
 993         depends on PCI && 8260
 994         select PPC_INDIRECT_PCI
 995         default y
 996
 997 source "drivers/pci/Kconfig"
 998
 999 source "drivers/pcmcia/Kconfig"
1000
1001 config HAS_RAPIDIO
1002         bool
1003         default n
1004
1005 config RAPIDIO
1006         tristate "RapidIO support"
1007         depends on HAS_RAPIDIO || PCI
1008         help
1009           If you say Y here, the kernel will include drivers and
1010           infrastructure code to support RapidIO interconnect devices.
1011
1012 config FSL_RIO
1013         bool "Freescale Embedded SRIO Controller support"
1014         depends on RAPIDIO = y && HAS_RAPIDIO
1015         default "n"
1016         ---help---
1017           Include support for RapidIO controller on Freescale embedded
1018           processors (MPC8548, MPC8641, etc).
1019
1020 source "drivers/rapidio/Kconfig"
1021
1022 endmenu
1023
1024 config NONSTATIC_KERNEL
1025         bool
1026         default n
1027
1028 menu "Advanced setup"
1029         depends on PPC32
1030
1031 config ADVANCED_OPTIONS
1032         bool "Prompt for advanced kernel configuration options"
1033         help
1034           This option will enable prompting for a variety of advanced kernel
1035           configuration options.  These options can cause the kernel to not
1036           work if they are set incorrectly, but can be used to optimize certain
1037           aspects of kernel memory management.
1038
1039           Unless you know what you are doing, say N here.
1040
1041 comment "Default settings for advanced configuration options are used"
1042         depends on !ADVANCED_OPTIONS
1043
1044 config LOWMEM_SIZE_BOOL
1045         bool "Set maximum low memory"
1046         depends on ADVANCED_OPTIONS
1047         help
1048           This option allows you to set the maximum amount of memory which
1049           will be used as "low memory", that is, memory which the kernel can
1050           access directly, without having to set up a kernel virtual mapping.
1051           This can be useful in optimizing the layout of kernel virtual
1052           memory.
1053
1054           Say N here unless you know what you are doing.
1055
1056 config LOWMEM_SIZE
1057         hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1058         default "0x30000000"
1059
1060 config LOWMEM_CAM_NUM_BOOL
1061         bool "Set number of CAMs to use to map low memory"
1062         depends on ADVANCED_OPTIONS && FSL_BOOKE
1063         help
1064           This option allows you to set the maximum number of CAM slots that
1065           will be used to map low memory.  There are a limited number of slots
1066           available and even more limited number that will fit in the L1 MMU.
1067           However, using more entries will allow mapping more low memory.  This
1068           can be useful in optimizing the layout of kernel virtual memory.
1069
1070           Say N here unless you know what you are doing.
1071
1072 config LOWMEM_CAM_NUM
1073         depends on FSL_BOOKE
1074         int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1075         default 3
1076
1077 config DYNAMIC_MEMSTART
1078         bool "Enable page aligned dynamic load address for kernel"
1079         depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1080         select NONSTATIC_KERNEL
1081         help
1082           This option enables the kernel to be loaded at any page aligned
1083           physical address. The kernel creates a mapping from KERNELBASE to
1084           the address where the kernel is loaded. The page size here implies
1085           the TLB page size of the mapping for kernel on the particular platform.
1086           Please refer to the init code for finding the TLB page size.
1087
1088           DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1089           kernel image, where the only restriction is the page aligned kernel
1090           load address. When this option is enabled, the compile time physical
1091           address CONFIG_PHYSICAL_START is ignored.
1092
1093           This option is overridden by CONFIG_RELOCATABLE
1094
1095 config PAGE_OFFSET_BOOL
1096         bool "Set custom page offset address"
1097         depends on ADVANCED_OPTIONS
1098         help
1099           This option allows you to set the kernel virtual address at which
1100           the kernel will map low memory.  This can be useful in optimizing
1101           the virtual memory layout of the system.
1102
1103           Say N here unless you know what you are doing.
1104
1105 config PAGE_OFFSET
1106         hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1107         default "0xc0000000"
1108
1109 config KERNEL_START_BOOL
1110         bool "Set custom kernel base address"
1111         depends on ADVANCED_OPTIONS
1112         help
1113           This option allows you to set the kernel virtual address at which
1114           the kernel will be loaded.  Normally this should match PAGE_OFFSET
1115           however there are times (like kdump) that one might not want them
1116           to be the same.
1117
1118           Say N here unless you know what you are doing.
1119
1120 config KERNEL_START
1121         hex "Virtual address of kernel base" if KERNEL_START_BOOL
1122         default PAGE_OFFSET if PAGE_OFFSET_BOOL
1123         default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1124         default "0xc0000000"
1125
1126 config PHYSICAL_START_BOOL
1127         bool "Set physical address where the kernel is loaded"
1128         depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1129         help
1130           This gives the physical address where the kernel is loaded.
1131
1132           Say N here unless you know what you are doing.
1133
1134 config PHYSICAL_START
1135         hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1136         default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1137         default "0x00000000"
1138
1139 config PHYSICAL_ALIGN
1140         hex
1141         default "0x04000000" if FSL_BOOKE
1142         help
1143           This value puts the alignment restrictions on physical address
1144           where kernel is loaded and run from. Kernel is compiled for an
1145           address which meets above alignment restriction.
1146
1147 config TASK_SIZE_BOOL
1148         bool "Set custom user task size"
1149         depends on ADVANCED_OPTIONS
1150         help
1151           This option allows you to set the amount of virtual address space
1152           allocated to user tasks.  This can be useful in optimizing the
1153           virtual memory layout of the system.
1154
1155           Say N here unless you know what you are doing.
1156
1157 config TASK_SIZE
1158         hex "Size of user task space" if TASK_SIZE_BOOL
1159         default "0x80000000" if PPC_8xx
1160         default "0xc0000000"
1161
1162 config CONSISTENT_SIZE_BOOL
1163         bool "Set custom consistent memory pool size"
1164         depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1165         help
1166           This option allows you to set the size of the
1167           consistent memory pool.  This pool of virtual memory
1168           is used to make consistent memory allocations.
1169
1170 config CONSISTENT_SIZE
1171         hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1172         default "0x00200000" if NOT_COHERENT_CACHE
1173
1174 config PIN_TLB
1175         bool "Pinned Kernel TLBs (860 ONLY)"
1176         depends on ADVANCED_OPTIONS && PPC_8xx && \
1177                    !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1178
1179 config PIN_TLB_DATA
1180         bool "Pinned TLB for DATA"
1181         depends on PIN_TLB
1182         default y
1183
1184 config PIN_TLB_IMMR
1185         bool "Pinned TLB for IMMR"
1186         depends on PIN_TLB
1187         default y
1188
1189 config PIN_TLB_TEXT
1190         bool "Pinned TLB for TEXT"
1191         depends on PIN_TLB
1192         default y
1193 endmenu
1194
1195 if PPC64
1196 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1197 config PAGE_OFFSET
1198         hex
1199         default "0xc000000000000000"
1200 config KERNEL_START
1201         hex
1202         default "0xc000000000000000"
1203 config PHYSICAL_START
1204         hex
1205         default "0x00000000"
1206 endif
1207
1208 config  ARCH_RANDOM
1209         def_bool n
1210
1211 source "net/Kconfig"
1212
1213 source "drivers/Kconfig"
1214
1215 source "fs/Kconfig"
1216
1217 source "lib/Kconfig"
1218
1219 source "arch/powerpc/Kconfig.debug"
1220
1221 source "security/Kconfig"
1222
1223 source "crypto/Kconfig"
1224
1225 config PPC_LIB_RHEAP
1226         bool
1227
1228 source "arch/powerpc/kvm/Kconfig"
1229
1230 source "kernel/livepatch/Kconfig"