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_PMEM_API                if PPC64
 143         select ARCH_HAS_SCALED_CPUTIME          if VIRT_CPU_ACCOUNTING_NATIVE
 144         select ARCH_HAS_SG_CHAIN
 145         select ARCH_HAS_TICK_BROADCAST          if GENERIC_CLOCKEVENTS_BROADCAST
 146         select ARCH_HAS_UACCESS_FLUSHCACHE      if PPC64
 147         select ARCH_HAS_UBSAN_SANITIZE_ALL
 148         select ARCH_HAS_ZONE_DEVICE             if PPC_BOOK3S_64
 149         select ARCH_HAVE_NMI_SAFE_CMPXCHG
 150         select ARCH_MIGHT_HAVE_PC_PARPORT
 151         select ARCH_MIGHT_HAVE_PC_SERIO
 152         select ARCH_SUPPORTS_ATOMIC_RMW
 153         select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
 154         select ARCH_USE_BUILTIN_BSWAP
 155         select ARCH_USE_CMPXCHG_LOCKREF         if PPC64
 156         select ARCH_WANT_IPC_PARSE_VERSION
 157         select ARCH_WEAK_RELEASE_ACQUIRE
 158         select BINFMT_ELF
 159         select BUILDTIME_EXTABLE_SORT
 160         select CLONE_BACKWARDS
 161         select DCACHE_WORD_ACCESS               if PPC64 && CPU_LITTLE_ENDIAN
 162         select EDAC_ATOMIC_SCRUB
 163         select EDAC_SUPPORT
 164         select GENERIC_ATOMIC64                 if PPC32
 165         select GENERIC_CLOCKEVENTS
 166         select GENERIC_CLOCKEVENTS_BROADCAST    if SMP
 167         select GENERIC_CMOS_UPDATE
 168         select GENERIC_CPU_AUTOPROBE
 169         select GENERIC_IRQ_SHOW
 170         select GENERIC_IRQ_SHOW_LEVEL
 171         select GENERIC_SMP_IDLE_THREAD
 172         select GENERIC_STRNCPY_FROM_USER
 173         select GENERIC_STRNLEN_USER
 174         select GENERIC_TIME_VSYSCALL
 175         select HAVE_ARCH_AUDITSYSCALL
 176         select HAVE_ARCH_JUMP_LABEL
 177         select HAVE_ARCH_KGDB
 178         select HAVE_ARCH_MMAP_RND_BITS
 179         select HAVE_ARCH_MMAP_RND_COMPAT_BITS   if COMPAT
 180         select HAVE_ARCH_SECCOMP_FILTER
 181         select HAVE_ARCH_TRACEHOOK
 182         select ARCH_HAS_STRICT_KERNEL_RWX       if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION)
 183         select ARCH_OPTIONAL_KERNEL_RWX         if ARCH_HAS_STRICT_KERNEL_RWX
 184         select HAVE_CBPF_JIT                    if !PPC64
 185         select HAVE_CONTEXT_TRACKING            if PPC64
 186         select HAVE_DEBUG_KMEMLEAK
 187         select HAVE_DEBUG_STACKOVERFLOW
 188         select HAVE_DMA_API_DEBUG
 189         select HAVE_DYNAMIC_FTRACE
 190         select HAVE_DYNAMIC_FTRACE_WITH_REGS    if MPROFILE_KERNEL
 191         select HAVE_EBPF_JIT                    if PPC64
 192         select HAVE_EFFICIENT_UNALIGNED_ACCESS  if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
 193         select HAVE_FTRACE_MCOUNT_RECORD
 194         select HAVE_FUNCTION_GRAPH_TRACER
 195         select HAVE_FUNCTION_TRACER
 196         select HAVE_GCC_PLUGINS
 197         select HAVE_GENERIC_GUP
 198         select HAVE_HW_BREAKPOINT               if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
 199         select HAVE_IDE
 200         select HAVE_IOREMAP_PROT
 201         select HAVE_IRQ_EXIT_ON_IRQ_STACK
 202         select HAVE_KERNEL_GZIP
 203         select HAVE_KPROBES
 204         select HAVE_KPROBES_ON_FTRACE
 205         select HAVE_KRETPROBES
 206         select HAVE_LIVEPATCH                   if HAVE_DYNAMIC_FTRACE_WITH_REGS
 207         select HAVE_MEMBLOCK
 208         select HAVE_MEMBLOCK_NODE_MAP
 209         select HAVE_MOD_ARCH_SPECIFIC
 210         select HAVE_NMI                         if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
 211         select HAVE_HARDLOCKUP_DETECTOR_ARCH    if (PPC64 && PPC_BOOK3S)
 212         select HAVE_OPROFILE
 213         select HAVE_OPTPROBES                   if PPC64
 214         select HAVE_PERF_EVENTS
 215         select HAVE_PERF_EVENTS_NMI             if PPC64
 216         select HAVE_HARDLOCKUP_DETECTOR_PERF    if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
 217         select HAVE_PERF_REGS
 218         select HAVE_PERF_USER_STACK_DUMP
 219         select HAVE_RCU_TABLE_FREE              if SMP
 220         select HAVE_REGS_AND_STACK_ACCESS_API
 221         select HAVE_SYSCALL_TRACEPOINTS
 222         select HAVE_VIRT_CPU_ACCOUNTING
 223         select HAVE_IRQ_TIME_ACCOUNTING
 224         select IRQ_DOMAIN
 225         select IRQ_FORCED_THREADING
 226         select MODULES_USE_ELF_RELA
 227         select NO_BOOTMEM
 228         select OF
 229         select OF_EARLY_FLATTREE
 230         select OF_RESERVED_MEM
 231         select OLD_SIGACTION                    if PPC32
 232         select OLD_SIGSUSPEND
 233         select SPARSE_IRQ
 234         select SYSCTL_EXCEPTION_TRACE
 235         select VIRT_TO_BUS                      if !PPC64
 236         #
 237         # Please keep this list sorted alphabetically.
 238         #
 239
 240 config GENERIC_CSUM
 241         def_bool n
 242
 243 config EARLY_PRINTK
 244         bool
 245         default y
 246
 247 config PANIC_TIMEOUT
 248         int
 249         default 180
 250
 251 config COMPAT
 252         bool
 253         default y if PPC64
 254         select COMPAT_BINFMT_ELF
 255         select ARCH_WANT_OLD_COMPAT_IPC
 256         select COMPAT_OLD_SIGACTION
 257
 258 config SYSVIPC_COMPAT
 259         bool
 260         depends on COMPAT && SYSVIPC
 261         default y
 262
 263 # All PPC32s use generic nvram driver through ppc_md
 264 config GENERIC_NVRAM
 265         bool
 266         default y if PPC32
 267
 268 config SCHED_OMIT_FRAME_POINTER
 269         bool
 270         default y
 271
 272 config ARCH_MAY_HAVE_PC_FDC
 273         bool
 274         default PCI
 275
 276 config PPC_UDBG_16550
 277         bool
 278         default n
 279
 280 config GENERIC_TBSYNC
 281         bool
 282         default y if PPC32 && SMP
 283         default n
 284
 285 config AUDIT_ARCH
 286         bool
 287         default y
 288
 289 config GENERIC_BUG
 290         bool
 291         default y
 292         depends on BUG
 293
 294 config SYS_SUPPORTS_APM_EMULATION
 295         default y if PMAC_APM_EMU
 296         bool
 297
 298 config EPAPR_BOOT
 299         bool
 300         help
 301           Used to allow a board to specify it wants an ePAPR compliant wrapper.
 302         default n
 303
 304 config DEFAULT_UIMAGE
 305         bool
 306         help
 307           Used to allow a board to specify it wants a uImage built by default
 308         default n
 309
 310 config ARCH_HIBERNATION_POSSIBLE
 311         bool
 312         default y
 313
 314 config ARCH_SUSPEND_POSSIBLE
 315         def_bool y
 316         depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
 317                    (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
 318                    || 44x || 40x
 319
 320 config PPC_DCR_NATIVE
 321         bool
 322         default n
 323
 324 config PPC_DCR_MMIO
 325         bool
 326         default n
 327
 328 config PPC_DCR
 329         bool
 330         depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
 331         default y
 332
 333 config PPC_OF_PLATFORM_PCI
 334         bool
 335         depends on PCI
 336         depends on PPC64 # not supported on 32 bits yet
 337         default n
 338
 339 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
 340         depends on PPC32 || PPC_BOOK3S_64
 341         def_bool y
 342
 343 config ARCH_SUPPORTS_UPROBES
 344         def_bool y
 345
 346 config PPC_ADV_DEBUG_REGS
 347         bool
 348         depends on 40x || BOOKE
 349         default y
 350
 351 config PPC_ADV_DEBUG_IACS
 352         int
 353         depends on PPC_ADV_DEBUG_REGS
 354         default 4 if 44x
 355         default 2
 356
 357 config PPC_ADV_DEBUG_DACS
 358         int
 359         depends on PPC_ADV_DEBUG_REGS
 360         default 2
 361
 362 config PPC_ADV_DEBUG_DVCS
 363         int
 364         depends on PPC_ADV_DEBUG_REGS
 365         default 2 if 44x
 366         default 0
 367
 368 config PPC_ADV_DEBUG_DAC_RANGE
 369         bool
 370         depends on PPC_ADV_DEBUG_REGS && 44x
 371         default y
 372
 373 config ZONE_DMA32
 374         bool
 375         default y if PPC64
 376
 377 config PGTABLE_LEVELS
 378         int
 379         default 2 if !PPC64
 380         default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
 381         default 4
 382
 383 source "init/Kconfig"
 384
 385 source "kernel/Kconfig.freezer"
 386
 387 source "arch/powerpc/sysdev/Kconfig"
 388 source "arch/powerpc/platforms/Kconfig"
 389
 390 menu "Kernel options"
 391
 392 config HIGHMEM
 393         bool "High memory support"
 394         depends on PPC32
 395
 396 source kernel/Kconfig.hz
 397 source kernel/Kconfig.preempt
 398 source "fs/Kconfig.binfmt"
 399
 400 config HUGETLB_PAGE_SIZE_VARIABLE
 401         bool
 402         depends on HUGETLB_PAGE
 403         default y
 404
 405 config MATH_EMULATION
 406         bool "Math emulation"
 407         depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
 408         ---help---
 409           Some PowerPC chips designed for embedded applications do not have
 410           a floating-point unit and therefore do not implement the
 411           floating-point instructions in the PowerPC instruction set.  If you
 412           say Y here, the kernel will include code to emulate a floating-point
 413           unit, which will allow programs that use floating-point
 414           instructions to run.
 415
 416           This is also useful to emulate missing (optional) instructions
 417           such as fsqrt on cores that do have an FPU but do not implement
 418           them (such as Freescale BookE).
 419
 420 choice
 421         prompt "Math emulation options"
 422         default MATH_EMULATION_FULL
 423         depends on MATH_EMULATION
 424
 425 config  MATH_EMULATION_FULL
 426         bool "Emulate all the floating point instructions"
 427         ---help---
 428           Select this option will enable the kernel to support to emulate
 429           all the floating point instructions. If your SoC doesn't have
 430           a FPU, you should select this.
 431
 432 config MATH_EMULATION_HW_UNIMPLEMENTED
 433         bool "Just emulate the FPU unimplemented instructions"
 434         ---help---
 435           Select this if you know there does have a hardware FPU on your
 436           SoC, but some floating point instructions are not implemented by that.
 437
 438 endchoice
 439
 440 config PPC_TRANSACTIONAL_MEM
 441        bool "Transactional Memory support for POWERPC"
 442        depends on PPC_BOOK3S_64
 443        depends on SMP
 444        select ALTIVEC
 445        select VSX
 446        default n
 447        ---help---
 448          Support user-mode Transactional Memory on POWERPC.
 449
 450 config LD_HEAD_STUB_CATCH
 451         bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
 452         depends on PPC64
 453         default n
 454         help
 455           Very large kernels can cause linker branch stubs to be generated by
 456           code in head_64.S, which moves the head text sections out of their
 457           specified location. This option can work around the problem.
 458
 459           If unsure, say "N".
 460
 461 config DISABLE_MPROFILE_KERNEL
 462         bool "Disable use of mprofile-kernel for kernel tracing"
 463         depends on PPC64 && CPU_LITTLE_ENDIAN
 464         default y
 465         help
 466           Selecting this options disables use of the mprofile-kernel ABI for
 467           kernel tracing. That will cause options such as live patching
 468           (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
 469           be disabled also.
 470
 471           If you have a toolchain which supports mprofile-kernel, then you can
 472           disable this. Otherwise leave it enabled. If you're not sure, say
 473           "Y".
 474
 475 config MPROFILE_KERNEL
 476         depends on PPC64 && CPU_LITTLE_ENDIAN
 477         def_bool !DISABLE_MPROFILE_KERNEL
 478
 479 config IOMMU_HELPER
 480         def_bool PPC64
 481
 482 config SWIOTLB
 483         bool "SWIOTLB support"
 484         default n
 485         select IOMMU_HELPER
 486         ---help---
 487           Support for IO bounce buffering for systems without an IOMMU.
 488           This allows us to DMA to the full physical address space on
 489           platforms where the size of a physical address is larger
 490           than the bus address.  Not all platforms support this.
 491
 492 config HOTPLUG_CPU
 493         bool "Support for enabling/disabling CPUs"
 494         depends on SMP && (PPC_PSERIES || \
 495         PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
 496         ---help---
 497           Say Y here to be able to disable and re-enable individual
 498           CPUs at runtime on SMP machines.
 499
 500           Say N if you are unsure.
 501
 502 config ARCH_CPU_PROBE_RELEASE
 503         def_bool y
 504         depends on HOTPLUG_CPU
 505
 506 config ARCH_ENABLE_MEMORY_HOTPLUG
 507         def_bool y
 508
 509 config ARCH_HAS_WALK_MEMORY
 510         def_bool y
 511
 512 config ARCH_ENABLE_MEMORY_HOTREMOVE
 513         def_bool y
 514
 515 config PPC64_SUPPORTS_MEMORY_FAILURE
 516         bool "Add support for memory hwpoison"
 517         depends on PPC_BOOK3S_64
 518         default "y" if PPC_POWERNV
 519         select ARCH_SUPPORTS_MEMORY_FAILURE
 520
 521 config KEXEC
 522         bool "kexec system call"
 523         depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
 524         select KEXEC_CORE
 525         help
 526           kexec is a system call that implements the ability to shutdown your
 527           current kernel, and to start another kernel.  It is like a reboot
 528           but it is independent of the system firmware.   And like a reboot
 529           you can start any kernel with it, not just Linux.
 530
 531           The name comes from the similarity to the exec system call.
 532
 533           It is an ongoing process to be certain the hardware in a machine
 534           is properly shutdown, so do not be surprised if this code does not
 535           initially work for you.  As of this writing the exact hardware
 536           interface is strongly in flux, so no good recommendation can be
 537           made.
 538
 539 config KEXEC_FILE
 540         bool "kexec file based system call"
 541         select KEXEC_CORE
 542         select HAVE_IMA_KEXEC
 543         select BUILD_BIN2C
 544         depends on PPC64
 545         depends on CRYPTO=y
 546         depends on CRYPTO_SHA256=y
 547         help
 548           This is a new version of the kexec system call. This call is
 549           file based and takes in file descriptors as system call arguments
 550           for kernel and initramfs as opposed to a list of segments as is the
 551           case for the older kexec call.
 552
 553 config RELOCATABLE
 554         bool "Build a relocatable kernel"
 555         depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
 556         select NONSTATIC_KERNEL
 557         select MODULE_REL_CRCS if MODVERSIONS
 558         help
 559           This builds a kernel image that is capable of running at the
 560           location the kernel is loaded at. For ppc32, there is no any
 561           alignment restrictions, and this feature is a superset of
 562           DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
 563           16k-aligned base address. The kernel is linked as a
 564           position-independent executable (PIE) and contains dynamic relocations
 565           which are processed early in the bootup process.
 566
 567           One use is for the kexec on panic case where the recovery kernel
 568           must live at a different physical address than the primary
 569           kernel.
 570
 571           Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
 572           it has been loaded at and the compile time physical addresses
 573           CONFIG_PHYSICAL_START is ignored.  However CONFIG_PHYSICAL_START
 574           setting can still be useful to bootwrappers that need to know the
 575           load address of the kernel (eg. u-boot/mkimage).
 576
 577 config RELOCATABLE_TEST
 578         bool "Test relocatable kernel"
 579         depends on (PPC64 && RELOCATABLE)
 580         default n
 581         help
 582           This runs the relocatable kernel at the address it was initially
 583           loaded at, which tends to be non-zero and therefore test the
 584           relocation code.
 585
 586 config CRASH_DUMP
 587         bool "Build a dump capture kernel"
 588         depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
 589         select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
 590         help
 591           Build a kernel suitable for use as a dump capture kernel.
 592           The same kernel binary can be used as production kernel and dump
 593           capture kernel.
 594
 595 config FA_DUMP
 596         bool "Firmware-assisted dump"
 597         depends on PPC64 && PPC_RTAS
 598         select CRASH_CORE
 599         select CRASH_DUMP
 600         help
 601           A robust mechanism to get reliable kernel crash dump with
 602           assistance from firmware. This approach does not use kexec,
 603           instead firmware assists in booting the capture kernel
 604           while preserving memory contents. Firmware-assisted dump
 605           is meant to be a kdump replacement offering robustness and
 606           speed not possible without system firmware assistance.
 607
 608           If unsure, say "N"
 609
 610 config IRQ_ALL_CPUS
 611         bool "Distribute interrupts on all CPUs by default"
 612         depends on SMP
 613         help
 614           This option gives the kernel permission to distribute IRQs across
 615           multiple CPUs.  Saying N here will route all IRQs to the first
 616           CPU.  Generally saying Y is safe, although some problems have been
 617           reported with SMP Power Macintoshes with this option enabled.
 618
 619 config NUMA
 620         bool "NUMA support"
 621         depends on PPC64
 622         default y if SMP && PPC_PSERIES
 623
 624 config NODES_SHIFT
 625         int
 626         default "8" if PPC64
 627         default "4"
 628         depends on NEED_MULTIPLE_NODES
 629
 630 config USE_PERCPU_NUMA_NODE_ID
 631         def_bool y
 632         depends on NUMA
 633
 634 config HAVE_MEMORYLESS_NODES
 635         def_bool y
 636         depends on NUMA
 637
 638 config ARCH_SELECT_MEMORY_MODEL
 639         def_bool y
 640         depends on PPC64
 641
 642 config ARCH_FLATMEM_ENABLE
 643         def_bool y
 644         depends on (PPC64 && !NUMA) || PPC32
 645
 646 config ARCH_SPARSEMEM_ENABLE
 647         def_bool y
 648         depends on PPC64
 649         select SPARSEMEM_VMEMMAP_ENABLE
 650
 651 config ARCH_SPARSEMEM_DEFAULT
 652         def_bool y
 653         depends on PPC_BOOK3S_64
 654
 655 config SYS_SUPPORTS_HUGETLBFS
 656         bool
 657
 658 config ILLEGAL_POINTER_VALUE
 659         hex
 660         # This is roughly half way between the top of user space and the bottom
 661         # of kernel space, which seems about as good as we can get.
 662         default 0x5deadbeef0000000 if PPC64
 663         default 0
 664
 665 source "mm/Kconfig"
 666
 667 config ARCH_MEMORY_PROBE
 668         def_bool y
 669         depends on MEMORY_HOTPLUG
 670
 671 # Some NUMA nodes have memory ranges that span
 672 # other nodes.  Even though a pfn is valid and
 673 # between a node's start and end pfns, it may not
 674 # reside on that node.  See memmap_init_zone()
 675 # for details.
 676 config NODES_SPAN_OTHER_NODES
 677         def_bool y
 678         depends on NEED_MULTIPLE_NODES
 679
 680 config STDBINUTILS
 681         bool "Using standard binutils settings"
 682         depends on 44x
 683         default y
 684         help
 685           Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
 686           Note, that kernel will be able to run only those applications,
 687           which had been compiled using binutils later than 2.17.50.0.3 with
 688           '-zmax-page-size' set to 256K (the default is 64K). Or, if using
 689           the older binutils, you can patch them with a trivial patch, which
 690           changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
 691
 692 choice
 693         prompt "Page size"
 694         default PPC_4K_PAGES
 695         help
 696           Select the kernel logical page size. Increasing the page size
 697           will reduce software overhead at each page boundary, allow
 698           hardware prefetch mechanisms to be more effective, and allow
 699           larger dma transfers increasing IO efficiency and reducing
 700           overhead. However the utilization of memory will increase.
 701           For example, each cached file will using a multiple of the
 702           page size to hold its contents and the difference between the
 703           end of file and the end of page is wasted.
 704
 705           Some dedicated systems, such as software raid serving with
 706           accelerated calculations, have shown significant increases.
 707
 708           If you configure a 64 bit kernel for 64k pages but the
 709           processor does not support them, then the kernel will simulate
 710           them with 4k pages, loading them on demand, but with the
 711           reduced software overhead and larger internal fragmentation.
 712           For the 32 bit kernel, a large page option will not be offered
 713           unless it is supported by the configured processor.
 714
 715           If unsure, choose 4K_PAGES.
 716
 717 config PPC_4K_PAGES
 718         bool "4k page size"
 719         select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
 720
 721 config PPC_16K_PAGES
 722         bool "16k page size"
 723         depends on 44x || PPC_8xx
 724
 725 config PPC_64K_PAGES
 726         bool "64k page size"
 727         depends on !PPC_FSL_BOOK3E && (44x || PPC_BOOK3S_64 || PPC_BOOK3E_64)
 728         select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
 729
 730 config PPC_256K_PAGES
 731         bool "256k page size"
 732         depends on 44x && !STDBINUTILS
 733         help
 734           Make the page size 256k.
 735
 736           As the ELF standard only requires alignment to support page
 737           sizes up to 64k, you will need to compile all of your user
 738           space applications with a non-standard binutils settings
 739           (see the STDBINUTILS description for details).
 740
 741           Say N unless you know what you are doing.
 742
 743 endchoice
 744
 745 config THREAD_SHIFT
 746         int "Thread shift" if EXPERT
 747         range 13 15
 748         default "15" if PPC_256K_PAGES
 749         default "14" if PPC64
 750         default "13"
 751         help
 752           Used to define the stack size. The default is almost always what you
 753           want. Only change this if you know what you are doing.
 754
 755 config FORCE_MAX_ZONEORDER
 756         int "Maximum zone order"
 757         range 8 9 if PPC64 && PPC_64K_PAGES
 758         default "9" if PPC64 && PPC_64K_PAGES
 759         range 13 13 if PPC64 && !PPC_64K_PAGES
 760         default "13" if PPC64 && !PPC_64K_PAGES
 761         range 9 64 if PPC32 && PPC_16K_PAGES
 762         default "9" if PPC32 && PPC_16K_PAGES
 763         range 7 64 if PPC32 && PPC_64K_PAGES
 764         default "7" if PPC32 && PPC_64K_PAGES
 765         range 5 64 if PPC32 && PPC_256K_PAGES
 766         default "5" if PPC32 && PPC_256K_PAGES
 767         range 11 64
 768         default "11"
 769         help
 770           The kernel memory allocator divides physically contiguous memory
 771           blocks into "zones", where each zone is a power of two number of
 772           pages.  This option selects the largest power of two that the kernel
 773           keeps in the memory allocator.  If you need to allocate very large
 774           blocks of physically contiguous memory, then you may need to
 775           increase this value.
 776
 777           This config option is actually maximum order plus one. For example,
 778           a value of 11 means that the largest free memory block is 2^10 pages.
 779
 780           The page size is not necessarily 4KB.  For example, on 64-bit
 781           systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES.  Keep
 782           this in mind when choosing a value for this option.
 783
 784 config PPC_SUBPAGE_PROT
 785         bool "Support setting protections for 4k subpages"
 786         depends on PPC_BOOK3S_64 && PPC_64K_PAGES
 787         help
 788           This option adds support for a system call to allow user programs
 789           to set access permissions (read/write, readonly, or no access)
 790           on the 4k subpages of each 64k page.
 791
 792 config PPC_COPRO_BASE
 793         bool
 794         default n
 795
 796 config SCHED_SMT
 797         bool "SMT (Hyperthreading) scheduler support"
 798         depends on PPC64 && SMP
 799         help
 800           SMT scheduler support improves the CPU scheduler's decision making
 801           when dealing with POWER5 cpus at a cost of slightly increased
 802           overhead in some places. If unsure say N here.
 803
 804 config PPC_DENORMALISATION
 805         bool "PowerPC denormalisation exception handling"
 806         depends on PPC_BOOK3S_64
 807         default "y" if PPC_POWERNV
 808         ---help---
 809           Add support for handling denormalisation of single precision
 810           values.  Useful for bare metal only.  If unsure say Y here.
 811
 812 config CMDLINE_BOOL
 813         bool "Default bootloader kernel arguments"
 814
 815 config CMDLINE
 816         string "Initial kernel command string"
 817         depends on CMDLINE_BOOL
 818         default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
 819         help
 820           On some platforms, there is currently no way for the boot loader to
 821           pass arguments to the kernel. For these platforms, you can supply
 822           some command-line options at build time by entering them here.  In
 823           most cases you will need to specify the root device here.
 824
 825 config CMDLINE_FORCE
 826         bool "Always use the default kernel command string"
 827         depends on CMDLINE_BOOL
 828         help
 829           Always use the default kernel command string, even if the boot
 830           loader passes other arguments to the kernel.
 831           This is useful if you cannot or don't want to change the
 832           command-line options your boot loader passes to the kernel.
 833
 834 config EXTRA_TARGETS
 835         string "Additional default image types"
 836         help
 837           List additional targets to be built by the bootwrapper here (separated
 838           by spaces).  This is useful for targets that depend of device tree
 839           files in the .dts directory.
 840
 841           Targets in this list will be build as part of the default build
 842           target, or when the user does a 'make zImage' or a
 843           'make zImage.initrd'.
 844
 845           If unsure, leave blank
 846
 847 config ARCH_WANTS_FREEZER_CONTROL
 848         def_bool y
 849         depends on ADB_PMU
 850
 851 source kernel/power/Kconfig
 852
 853 config SECCOMP
 854         bool "Enable seccomp to safely compute untrusted bytecode"
 855         depends on PROC_FS
 856         default y
 857         help
 858           This kernel feature is useful for number crunching applications
 859           that may need to compute untrusted bytecode during their
 860           execution. By using pipes or other transports made available to
 861           the process as file descriptors supporting the read/write
 862           syscalls, it's possible to isolate those applications in
 863           their own address space using seccomp. Once seccomp is
 864           enabled via /proc/<pid>/seccomp, it cannot be disabled
 865           and the task is only allowed to execute a few safe syscalls
 866           defined by each seccomp mode.
 867
 868           If unsure, say Y. Only embedded should say N here.
 869
 870 endmenu
 871
 872 config ISA_DMA_API
 873         bool
 874         default PCI
 875
 876 menu "Bus options"
 877
 878 config ISA
 879         bool "Support for ISA-bus hardware"
 880         depends on PPC_CHRP
 881         select PPC_I8259
 882         help
 883           Find out whether you have ISA slots on your motherboard.  ISA is the
 884           name of a bus system, i.e. the way the CPU talks to the other stuff
 885           inside your box.  If you have an Apple machine, say N here; if you
 886           have an IBM RS/6000 or pSeries machine, say Y.  If you have an
 887           embedded board, consult your board documentation.
 888
 889 config ZONE_DMA
 890         bool
 891         default y
 892
 893 config NEED_DMA_MAP_STATE
 894         def_bool (PPC64 || NOT_COHERENT_CACHE)
 895
 896 config NEED_SG_DMA_LENGTH
 897         def_bool y
 898
 899 config GENERIC_ISA_DMA
 900         bool
 901         depends on ISA_DMA_API
 902         default y
 903
 904 config PPC_INDIRECT_PCI
 905         bool
 906         depends on PCI
 907         default y if 40x || 44x
 908         default n
 909
 910 config EISA
 911         bool
 912
 913 config SBUS
 914         bool
 915
 916 config FSL_SOC
 917         bool
 918
 919 config FSL_PCI
 920         bool
 921         select PPC_INDIRECT_PCI
 922         select PCI_QUIRKS
 923
 924 config FSL_PMC
 925         bool
 926         default y
 927         depends on SUSPEND && (PPC_85xx || PPC_86xx)
 928         help
 929           Freescale MPC85xx/MPC86xx power management controller support
 930           (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
 931
 932 config PPC4xx_CPM
 933         bool
 934         default y
 935         depends on SUSPEND && (44x || 40x)
 936         help
 937           PPC4xx Clock Power Management (CPM) support (suspend/resume).
 938           It also enables support for two different idle states (idle-wait
 939           and idle-doze).
 940
 941 config 4xx_SOC
 942         bool
 943
 944 config FSL_LBC
 945         bool "Freescale Local Bus support"
 946         help
 947           Enables reporting of errors from the Freescale local bus
 948           controller.  Also contains some common code used by
 949           drivers for specific local bus peripherals.
 950
 951 config FSL_GTM
 952         bool
 953         depends on PPC_83xx || QUICC_ENGINE || CPM2
 954         help
 955           Freescale General-purpose Timers support
 956
 957 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
 958 config MCA
 959         bool
 960
 961 # Platforms that what PCI turned unconditionally just do select PCI
 962 # in their config node.  Platforms that want to choose at config
 963 # time should select PPC_PCI_CHOICE
 964 config PPC_PCI_CHOICE
 965         bool
 966
 967 config PCI
 968         bool "PCI support" if PPC_PCI_CHOICE
 969         default y if !40x && !CPM2 && !PPC_8xx && !PPC_83xx \
 970                 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
 971         default PCI_QSPAN if PPC_8xx
 972         select GENERIC_PCI_IOMAP
 973         help
 974           Find out whether your system includes a PCI bus. PCI is the name of
 975           a bus system, i.e. the way the CPU talks to the other stuff inside
 976           your box.  If you say Y here, the kernel will include drivers and
 977           infrastructure code to support PCI bus devices.
 978
 979 config PCI_DOMAINS
 980         def_bool PCI
 981
 982 config PCI_SYSCALL
 983         def_bool PCI
 984
 985 config PCI_QSPAN
 986         bool "QSpan PCI"
 987         depends on PPC_8xx
 988         select PPC_I8259
 989         help
 990           Say Y here if you have a system based on a Motorola 8xx-series
 991           embedded processor with a QSPAN PCI interface, otherwise say N.
 992
 993 config PCI_8260
 994         bool
 995         depends on PCI && 8260
 996         select PPC_INDIRECT_PCI
 997         default y
 998
 999 source "drivers/pci/Kconfig"
1000
1001 source "drivers/pcmcia/Kconfig"
1002
1003 config HAS_RAPIDIO
1004         bool
1005         default n
1006
1007 config RAPIDIO
1008         tristate "RapidIO support"
1009         depends on HAS_RAPIDIO || PCI
1010         help
1011           If you say Y here, the kernel will include drivers and
1012           infrastructure code to support RapidIO interconnect devices.
1013
1014 config FSL_RIO
1015         bool "Freescale Embedded SRIO Controller support"
1016         depends on RAPIDIO = y && HAS_RAPIDIO
1017         default "n"
1018         ---help---
1019           Include support for RapidIO controller on Freescale embedded
1020           processors (MPC8548, MPC8641, etc).
1021
1022 source "drivers/rapidio/Kconfig"
1023
1024 endmenu
1025
1026 config NONSTATIC_KERNEL
1027         bool
1028         default n
1029
1030 menu "Advanced setup"
1031         depends on PPC32
1032
1033 config ADVANCED_OPTIONS
1034         bool "Prompt for advanced kernel configuration options"
1035         help
1036           This option will enable prompting for a variety of advanced kernel
1037           configuration options.  These options can cause the kernel to not
1038           work if they are set incorrectly, but can be used to optimize certain
1039           aspects of kernel memory management.
1040
1041           Unless you know what you are doing, say N here.
1042
1043 comment "Default settings for advanced configuration options are used"
1044         depends on !ADVANCED_OPTIONS
1045
1046 config LOWMEM_SIZE_BOOL
1047         bool "Set maximum low memory"
1048         depends on ADVANCED_OPTIONS
1049         help
1050           This option allows you to set the maximum amount of memory which
1051           will be used as "low memory", that is, memory which the kernel can
1052           access directly, without having to set up a kernel virtual mapping.
1053           This can be useful in optimizing the layout of kernel virtual
1054           memory.
1055
1056           Say N here unless you know what you are doing.
1057
1058 config LOWMEM_SIZE
1059         hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1060         default "0x30000000"
1061
1062 config LOWMEM_CAM_NUM_BOOL
1063         bool "Set number of CAMs to use to map low memory"
1064         depends on ADVANCED_OPTIONS && FSL_BOOKE
1065         help
1066           This option allows you to set the maximum number of CAM slots that
1067           will be used to map low memory.  There are a limited number of slots
1068           available and even more limited number that will fit in the L1 MMU.
1069           However, using more entries will allow mapping more low memory.  This
1070           can be useful in optimizing the layout of kernel virtual memory.
1071
1072           Say N here unless you know what you are doing.
1073
1074 config LOWMEM_CAM_NUM
1075         depends on FSL_BOOKE
1076         int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1077         default 3
1078
1079 config DYNAMIC_MEMSTART
1080         bool "Enable page aligned dynamic load address for kernel"
1081         depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1082         select NONSTATIC_KERNEL
1083         help
1084           This option enables the kernel to be loaded at any page aligned
1085           physical address. The kernel creates a mapping from KERNELBASE to
1086           the address where the kernel is loaded. The page size here implies
1087           the TLB page size of the mapping for kernel on the particular platform.
1088           Please refer to the init code for finding the TLB page size.
1089
1090           DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1091           kernel image, where the only restriction is the page aligned kernel
1092           load address. When this option is enabled, the compile time physical
1093           address CONFIG_PHYSICAL_START is ignored.
1094
1095           This option is overridden by CONFIG_RELOCATABLE
1096
1097 config PAGE_OFFSET_BOOL
1098         bool "Set custom page offset address"
1099         depends on ADVANCED_OPTIONS
1100         help
1101           This option allows you to set the kernel virtual address at which
1102           the kernel will map low memory.  This can be useful in optimizing
1103           the virtual memory layout of the system.
1104
1105           Say N here unless you know what you are doing.
1106
1107 config PAGE_OFFSET
1108         hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1109         default "0xc0000000"
1110
1111 config KERNEL_START_BOOL
1112         bool "Set custom kernel base address"
1113         depends on ADVANCED_OPTIONS
1114         help
1115           This option allows you to set the kernel virtual address at which
1116           the kernel will be loaded.  Normally this should match PAGE_OFFSET
1117           however there are times (like kdump) that one might not want them
1118           to be the same.
1119
1120           Say N here unless you know what you are doing.
1121
1122 config KERNEL_START
1123         hex "Virtual address of kernel base" if KERNEL_START_BOOL
1124         default PAGE_OFFSET if PAGE_OFFSET_BOOL
1125         default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1126         default "0xc0000000"
1127
1128 config PHYSICAL_START_BOOL
1129         bool "Set physical address where the kernel is loaded"
1130         depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1131         help
1132           This gives the physical address where the kernel is loaded.
1133
1134           Say N here unless you know what you are doing.
1135
1136 config PHYSICAL_START
1137         hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1138         default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1139         default "0x00000000"
1140
1141 config PHYSICAL_ALIGN
1142         hex
1143         default "0x04000000" if FSL_BOOKE
1144         help
1145           This value puts the alignment restrictions on physical address
1146           where kernel is loaded and run from. Kernel is compiled for an
1147           address which meets above alignment restriction.
1148
1149 config TASK_SIZE_BOOL
1150         bool "Set custom user task size"
1151         depends on ADVANCED_OPTIONS
1152         help
1153           This option allows you to set the amount of virtual address space
1154           allocated to user tasks.  This can be useful in optimizing the
1155           virtual memory layout of the system.
1156
1157           Say N here unless you know what you are doing.
1158
1159 config TASK_SIZE
1160         hex "Size of user task space" if TASK_SIZE_BOOL
1161         default "0x80000000" if PPC_8xx
1162         default "0xc0000000"
1163
1164 config CONSISTENT_SIZE_BOOL
1165         bool "Set custom consistent memory pool size"
1166         depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1167         help
1168           This option allows you to set the size of the
1169           consistent memory pool.  This pool of virtual memory
1170           is used to make consistent memory allocations.
1171
1172 config CONSISTENT_SIZE
1173         hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1174         default "0x00200000" if NOT_COHERENT_CACHE
1175
1176 config PIN_TLB
1177         bool "Pinned Kernel TLBs (860 ONLY)"
1178         depends on ADVANCED_OPTIONS && PPC_8xx && \
1179                    !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1180
1181 config PIN_TLB_DATA
1182         bool "Pinned TLB for DATA"
1183         depends on PIN_TLB
1184         default y
1185
1186 config PIN_TLB_IMMR
1187         bool "Pinned TLB for IMMR"
1188         depends on PIN_TLB
1189         default y
1190
1191 config PIN_TLB_TEXT
1192         bool "Pinned TLB for TEXT"
1193         depends on PIN_TLB
1194         default y
1195 endmenu
1196
1197 if PPC64
1198 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1199 config PAGE_OFFSET
1200         hex
1201         default "0xc000000000000000"
1202 config KERNEL_START
1203         hex
1204         default "0xc000000000000000"
1205 config PHYSICAL_START
1206         hex
1207         default "0x00000000"
1208 endif
1209
1210 config  ARCH_RANDOM
1211         def_bool n
1212
1213 source "net/Kconfig"
1214
1215 source "drivers/Kconfig"
1216
1217 source "fs/Kconfig"
1218
1219 source "lib/Kconfig"
1220
1221 source "arch/powerpc/Kconfig.debug"
1222
1223 source "security/Kconfig"
1224
1225 source "crypto/Kconfig"
1226
1227 config PPC_LIB_RHEAP
1228         bool
1229
1230 source "arch/powerpc/kvm/Kconfig"
1231
1232 source "kernel/livepatch/Kconfig"