arch/powerpc/Kconfig

   1 source "arch/powerpc/platforms/Kconfig.cputype"
   2
   3 config PPC32
   4         bool
   5         default y if !PPC64
   6
   7 config 32BIT
   8         bool
   9         default y if PPC32
  10
  11 config 64BIT
  12         bool
  13         default y if PPC64
  14
  15 config ARCH_PHYS_ADDR_T_64BIT
  16        def_bool PPC64 || PHYS_64BIT
  17
  18 config ARCH_DMA_ADDR_T_64BIT
  19         def_bool ARCH_PHYS_ADDR_T_64BIT
  20
  21 config MMU
  22         bool
  23         default y
  24
  25 config HAVE_SETUP_PER_CPU_AREA
  26         def_bool PPC64
  27
  28 config NEED_PER_CPU_EMBED_FIRST_CHUNK
  29         def_bool PPC64
  30
  31 config NR_IRQS
  32         int "Number of virtual interrupt numbers"
  33         range 32 32768
  34         default "512"
  35         help
  36           This defines the number of virtual interrupt numbers the kernel
  37           can manage. Virtual interrupt numbers are what you see in
  38           /proc/interrupts. If you configure your system to have too few,
  39           drivers will fail to load or worse - handle with care.
  40
  41 config STACKTRACE_SUPPORT
  42         bool
  43         default y
  44
  45 config TRACE_IRQFLAGS_SUPPORT
  46         bool
  47         default y
  48
  49 config LOCKDEP_SUPPORT
  50         bool
  51         default y
  52
  53 config RWSEM_GENERIC_SPINLOCK
  54         bool
  55
  56 config RWSEM_XCHGADD_ALGORITHM
  57         bool
  58         default y
  59
  60 config GENERIC_LOCKBREAK
  61         bool
  62         default y
  63         depends on SMP && PREEMPT
  64
  65 config ARCH_HAS_ILOG2_U32
  66         bool
  67         default y
  68
  69 config ARCH_HAS_ILOG2_U64
  70         bool
  71         default y if 64BIT
  72
  73 config GENERIC_HWEIGHT
  74         bool
  75         default y
  76
  77 config ARCH_HAS_DMA_SET_COHERENT_MASK
  78         bool
  79
  80 config PPC
  81         bool
  82         default y
  83         select ARCH_MIGHT_HAVE_PC_PARPORT
  84         select ARCH_MIGHT_HAVE_PC_SERIO
  85         select BINFMT_ELF
  86         select ARCH_HAS_ELF_RANDOMIZE
  87         select OF
  88         select OF_EARLY_FLATTREE
  89         select OF_RESERVED_MEM
  90         select HAVE_FTRACE_MCOUNT_RECORD
  91         select HAVE_DYNAMIC_FTRACE
  92         select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
  93         select HAVE_FUNCTION_TRACER
  94         select HAVE_FUNCTION_GRAPH_TRACER
  95         select SYSCTL_EXCEPTION_TRACE
  96         select VIRT_TO_BUS if !PPC64
  97         select HAVE_IDE
  98         select HAVE_IOREMAP_PROT
  99         select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
 100         select HAVE_KPROBES
 101         select HAVE_ARCH_KGDB
 102         select HAVE_KRETPROBES
 103         select HAVE_ARCH_TRACEHOOK
 104         select HAVE_MEMBLOCK
 105         select HAVE_MEMBLOCK_NODE_MAP
 106         select HAVE_DMA_API_DEBUG
 107         select HAVE_OPROFILE
 108         select HAVE_DEBUG_KMEMLEAK
 109         select ARCH_HAS_SG_CHAIN
 110         select GENERIC_ATOMIC64 if PPC32
 111         select HAVE_PERF_EVENTS
 112         select HAVE_PERF_REGS
 113         select HAVE_PERF_USER_STACK_DUMP
 114         select HAVE_REGS_AND_STACK_ACCESS_API
 115         select HAVE_HW_BREAKPOINT if PERF_EVENTS && PPC_BOOK3S_64
 116         select ARCH_WANT_IPC_PARSE_VERSION
 117         select SPARSE_IRQ
 118         select IRQ_DOMAIN
 119         select GENERIC_IRQ_SHOW
 120         select GENERIC_IRQ_SHOW_LEVEL
 121         select IRQ_FORCED_THREADING
 122         select HAVE_RCU_TABLE_FREE if SMP
 123         select HAVE_SYSCALL_TRACEPOINTS
 124         select HAVE_CBPF_JIT if !PPC64
 125         select HAVE_EBPF_JIT if PPC64
 126         select HAVE_ARCH_JUMP_LABEL
 127         select ARCH_HAVE_NMI_SAFE_CMPXCHG
 128         select ARCH_HAS_GCOV_PROFILE_ALL
 129         select GENERIC_SMP_IDLE_THREAD
 130         select GENERIC_CMOS_UPDATE
 131         select GENERIC_TIME_VSYSCALL_OLD
 132         select GENERIC_CLOCKEVENTS
 133         select GENERIC_CLOCKEVENTS_BROADCAST if SMP
 134         select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
 135         select GENERIC_STRNCPY_FROM_USER
 136         select GENERIC_STRNLEN_USER
 137         select HAVE_MOD_ARCH_SPECIFIC
 138         select MODULES_USE_ELF_RELA
 139         select CLONE_BACKWARDS
 140         select ARCH_USE_BUILTIN_BSWAP
 141         select OLD_SIGSUSPEND
 142         select OLD_SIGACTION if PPC32
 143         select HAVE_DEBUG_STACKOVERFLOW
 144         select HAVE_IRQ_EXIT_ON_IRQ_STACK
 145         select ARCH_USE_CMPXCHG_LOCKREF if PPC64
 146         select HAVE_ARCH_AUDITSYSCALL
 147         select ARCH_SUPPORTS_ATOMIC_RMW
 148         select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
 149         select NO_BOOTMEM
 150         select HAVE_GENERIC_RCU_GUP
 151         select HAVE_PERF_EVENTS_NMI if PPC64
 152         select HAVE_NMI if PERF_EVENTS
 153         select EDAC_SUPPORT
 154         select EDAC_ATOMIC_SCRUB
 155         select ARCH_HAS_DMA_SET_COHERENT_MASK
 156         select ARCH_HAS_DEVMEM_IS_ALLOWED
 157         select HAVE_ARCH_SECCOMP_FILTER
 158         select ARCH_HAS_UBSAN_SANITIZE_ALL
 159         select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
 160         select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
 161         select GENERIC_CPU_AUTOPROBE
 162         select HAVE_VIRT_CPU_ACCOUNTING
 163         select HAVE_ARCH_HARDENED_USERCOPY
 164         select HAVE_KERNEL_GZIP
 165
 166 config GENERIC_CSUM
 167         def_bool CPU_LITTLE_ENDIAN
 168
 169 config EARLY_PRINTK
 170         bool
 171         default y
 172
 173 config PANIC_TIMEOUT
 174         int
 175         default 180
 176
 177 config COMPAT
 178         bool
 179         default y if PPC64
 180         select COMPAT_BINFMT_ELF
 181         select ARCH_WANT_OLD_COMPAT_IPC
 182         select COMPAT_OLD_SIGACTION
 183
 184 config SYSVIPC_COMPAT
 185         bool
 186         depends on COMPAT && SYSVIPC
 187         default y
 188
 189 # All PPC32s use generic nvram driver through ppc_md
 190 config GENERIC_NVRAM
 191         bool
 192         default y if PPC32
 193
 194 config SCHED_OMIT_FRAME_POINTER
 195         bool
 196         default y
 197
 198 config ARCH_MAY_HAVE_PC_FDC
 199         bool
 200         default PCI
 201
 202 config PPC_UDBG_16550
 203         bool
 204         default n
 205
 206 config GENERIC_TBSYNC
 207         bool
 208         default y if PPC32 && SMP
 209         default n
 210
 211 config AUDIT_ARCH
 212         bool
 213         default y
 214
 215 config GENERIC_BUG
 216         bool
 217         default y
 218         depends on BUG
 219
 220 config SYS_SUPPORTS_APM_EMULATION
 221         default y if PMAC_APM_EMU
 222         bool
 223
 224 config EPAPR_BOOT
 225         bool
 226         help
 227           Used to allow a board to specify it wants an ePAPR compliant wrapper.
 228         default n
 229
 230 config DEFAULT_UIMAGE
 231         bool
 232         help
 233           Used to allow a board to specify it wants a uImage built by default
 234         default n
 235
 236 config ARCH_HIBERNATION_POSSIBLE
 237         bool
 238         default y
 239
 240 config ARCH_SUSPEND_POSSIBLE
 241         def_bool y
 242         depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
 243                    (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
 244                    || 44x || 40x
 245
 246 config PPC_DCR_NATIVE
 247         bool
 248         default n
 249
 250 config PPC_DCR_MMIO
 251         bool
 252         default n
 253
 254 config PPC_DCR
 255         bool
 256         depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
 257         default y
 258
 259 config PPC_OF_PLATFORM_PCI
 260         bool
 261         depends on PCI
 262         depends on PPC64 # not supported on 32 bits yet
 263         default n
 264
 265 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
 266         depends on PPC32 || PPC_STD_MMU_64
 267         def_bool y
 268
 269 config ARCH_SUPPORTS_UPROBES
 270         def_bool y
 271
 272 config PPC_ADV_DEBUG_REGS
 273         bool
 274         depends on 40x || BOOKE
 275         default y
 276
 277 config PPC_ADV_DEBUG_IACS
 278         int
 279         depends on PPC_ADV_DEBUG_REGS
 280         default 4 if 44x
 281         default 2
 282
 283 config PPC_ADV_DEBUG_DACS
 284         int
 285         depends on PPC_ADV_DEBUG_REGS
 286         default 2
 287
 288 config PPC_ADV_DEBUG_DVCS
 289         int
 290         depends on PPC_ADV_DEBUG_REGS
 291         default 2 if 44x
 292         default 0
 293
 294 config PPC_ADV_DEBUG_DAC_RANGE
 295         bool
 296         depends on PPC_ADV_DEBUG_REGS && 44x
 297         default y
 298
 299 config PPC_EMULATE_SSTEP
 300         bool
 301         default y if KPROBES || UPROBES || XMON || HAVE_HW_BREAKPOINT
 302
 303 config ZONE_DMA32
 304         bool
 305         default y if PPC64
 306
 307 config PGTABLE_LEVELS
 308         int
 309         default 2 if !PPC64
 310         default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
 311         default 4
 312
 313 source "init/Kconfig"
 314
 315 source "kernel/Kconfig.freezer"
 316
 317 source "arch/powerpc/sysdev/Kconfig"
 318 source "arch/powerpc/platforms/Kconfig"
 319
 320 menu "Kernel options"
 321
 322 config HIGHMEM
 323         bool "High memory support"
 324         depends on PPC32
 325
 326 source kernel/Kconfig.hz
 327 source kernel/Kconfig.preempt
 328 source "fs/Kconfig.binfmt"
 329
 330 config HUGETLB_PAGE_SIZE_VARIABLE
 331         bool
 332         depends on HUGETLB_PAGE
 333         default y
 334
 335 config MATH_EMULATION
 336         bool "Math emulation"
 337         depends on 4xx || 8xx || PPC_MPC832x || BOOKE
 338         ---help---
 339           Some PowerPC chips designed for embedded applications do not have
 340           a floating-point unit and therefore do not implement the
 341           floating-point instructions in the PowerPC instruction set.  If you
 342           say Y here, the kernel will include code to emulate a floating-point
 343           unit, which will allow programs that use floating-point
 344           instructions to run.
 345
 346           This is also useful to emulate missing (optional) instructions
 347           such as fsqrt on cores that do have an FPU but do not implement
 348           them (such as Freescale BookE).
 349
 350 choice
 351         prompt "Math emulation options"
 352         default MATH_EMULATION_FULL
 353         depends on MATH_EMULATION
 354
 355 config  MATH_EMULATION_FULL
 356         bool "Emulate all the floating point instructions"
 357         ---help---
 358           Select this option will enable the kernel to support to emulate
 359           all the floating point instructions. If your SoC doesn't have
 360           a FPU, you should select this.
 361
 362 config MATH_EMULATION_HW_UNIMPLEMENTED
 363         bool "Just emulate the FPU unimplemented instructions"
 364         ---help---
 365           Select this if you know there does have a hardware FPU on your
 366           SoC, but some floating point instructions are not implemented by that.
 367
 368 endchoice
 369
 370 config PPC_TRANSACTIONAL_MEM
 371        bool "Transactional Memory support for POWERPC"
 372        depends on PPC_BOOK3S_64
 373        depends on SMP
 374        select ALTIVEC
 375        select VSX
 376        default n
 377        ---help---
 378          Support user-mode Transactional Memory on POWERPC.
 379
 380 config DISABLE_MPROFILE_KERNEL
 381         bool "Disable use of mprofile-kernel for kernel tracing"
 382         depends on PPC64 && CPU_LITTLE_ENDIAN
 383         default y
 384         help
 385           Selecting this options disables use of the mprofile-kernel ABI for
 386           kernel tracing. That will cause options such as live patching
 387           (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
 388           be disabled also.
 389
 390           If you have a toolchain which supports mprofile-kernel, then you can
 391           enable this. Otherwise leave it disabled. If you're not sure, say
 392           "N".
 393
 394 config MPROFILE_KERNEL
 395         depends on PPC64 && CPU_LITTLE_ENDIAN
 396         def_bool !DISABLE_MPROFILE_KERNEL
 397
 398 config IOMMU_HELPER
 399         def_bool PPC64
 400
 401 config SWIOTLB
 402         bool "SWIOTLB support"
 403         default n
 404         select IOMMU_HELPER
 405         ---help---
 406           Support for IO bounce buffering for systems without an IOMMU.
 407           This allows us to DMA to the full physical address space on
 408           platforms where the size of a physical address is larger
 409           than the bus address.  Not all platforms support this.
 410
 411 config HOTPLUG_CPU
 412         bool "Support for enabling/disabling CPUs"
 413         depends on SMP && (PPC_PSERIES || \
 414         PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
 415         ---help---
 416           Say Y here to be able to disable and re-enable individual
 417           CPUs at runtime on SMP machines.
 418
 419           Say N if you are unsure.
 420
 421 config ARCH_CPU_PROBE_RELEASE
 422         def_bool y
 423         depends on HOTPLUG_CPU
 424
 425 config ARCH_ENABLE_MEMORY_HOTPLUG
 426         def_bool y
 427
 428 config ARCH_HAS_WALK_MEMORY
 429         def_bool y
 430
 431 config ARCH_ENABLE_MEMORY_HOTREMOVE
 432         def_bool y
 433
 434 config PPC64_SUPPORTS_MEMORY_FAILURE
 435         bool "Add support for memory hwpoison"
 436         depends on PPC_BOOK3S_64
 437         default "y" if PPC_POWERNV
 438         select ARCH_SUPPORTS_MEMORY_FAILURE
 439
 440 config KEXEC
 441         bool "kexec system call"
 442         depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
 443         select KEXEC_CORE
 444         help
 445           kexec is a system call that implements the ability to shutdown your
 446           current kernel, and to start another kernel.  It is like a reboot
 447           but it is independent of the system firmware.   And like a reboot
 448           you can start any kernel with it, not just Linux.
 449
 450           The name comes from the similarity to the exec system call.
 451
 452           It is an ongoing process to be certain the hardware in a machine
 453           is properly shutdown, so do not be surprised if this code does not
 454           initially work for you.  As of this writing the exact hardware
 455           interface is strongly in flux, so no good recommendation can be
 456           made.
 457
 458 config RELOCATABLE
 459         bool "Build a relocatable kernel"
 460         depends on (PPC64 && !COMPILE_TEST) || (FLATMEM && (44x || FSL_BOOKE))
 461         select NONSTATIC_KERNEL
 462         help
 463           This builds a kernel image that is capable of running at the
 464           location the kernel is loaded at. For ppc32, there is no any
 465           alignment restrictions, and this feature is a superset of
 466           DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
 467           16k-aligned base address. The kernel is linked as a
 468           position-independent executable (PIE) and contains dynamic relocations
 469           which are processed early in the bootup process.
 470
 471           One use is for the kexec on panic case where the recovery kernel
 472           must live at a different physical address than the primary
 473           kernel.
 474
 475           Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
 476           it has been loaded at and the compile time physical addresses
 477           CONFIG_PHYSICAL_START is ignored.  However CONFIG_PHYSICAL_START
 478           setting can still be useful to bootwrappers that need to know the
 479           load address of the kernel (eg. u-boot/mkimage).
 480
 481 config CRASH_DUMP
 482         bool "Build a kdump crash kernel"
 483         depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
 484         select RELOCATABLE if (PPC64 && !COMPILE_TEST) || 44x || FSL_BOOKE
 485         help
 486           Build a kernel suitable for use as a kdump capture kernel.
 487           The same kernel binary can be used as production kernel and dump
 488           capture kernel.
 489
 490 config FA_DUMP
 491         bool "Firmware-assisted dump"
 492         depends on PPC64 && PPC_RTAS && CRASH_DUMP && KEXEC
 493         help
 494           A robust mechanism to get reliable kernel crash dump with
 495           assistance from firmware. This approach does not use kexec,
 496           instead firmware assists in booting the kdump kernel
 497           while preserving memory contents. Firmware-assisted dump
 498           is meant to be a kdump replacement offering robustness and
 499           speed not possible without system firmware assistance.
 500
 501           If unsure, say "N"
 502
 503 config IRQ_ALL_CPUS
 504         bool "Distribute interrupts on all CPUs by default"
 505         depends on SMP
 506         help
 507           This option gives the kernel permission to distribute IRQs across
 508           multiple CPUs.  Saying N here will route all IRQs to the first
 509           CPU.  Generally saying Y is safe, although some problems have been
 510           reported with SMP Power Macintoshes with this option enabled.
 511
 512 config NUMA
 513         bool "NUMA support"
 514         depends on PPC64
 515         default y if SMP && PPC_PSERIES
 516
 517 config NODES_SHIFT
 518         int
 519         default "8" if PPC64
 520         default "4"
 521         depends on NEED_MULTIPLE_NODES
 522
 523 config USE_PERCPU_NUMA_NODE_ID
 524         def_bool y
 525         depends on NUMA
 526
 527 config HAVE_MEMORYLESS_NODES
 528         def_bool y
 529         depends on NUMA
 530
 531 config ARCH_SELECT_MEMORY_MODEL
 532         def_bool y
 533         depends on PPC64
 534
 535 config ARCH_FLATMEM_ENABLE
 536         def_bool y
 537         depends on (PPC64 && !NUMA) || PPC32
 538
 539 config ARCH_SPARSEMEM_ENABLE
 540         def_bool y
 541         depends on PPC64
 542         select SPARSEMEM_VMEMMAP_ENABLE
 543
 544 config ARCH_SPARSEMEM_DEFAULT
 545         def_bool y
 546         depends on (SMP && PPC_PSERIES) || PPC_PS3
 547
 548 config SYS_SUPPORTS_HUGETLBFS
 549         bool
 550
 551 source "mm/Kconfig"
 552
 553 config ARCH_MEMORY_PROBE
 554         def_bool y
 555         depends on MEMORY_HOTPLUG
 556
 557 # Some NUMA nodes have memory ranges that span
 558 # other nodes.  Even though a pfn is valid and
 559 # between a node's start and end pfns, it may not
 560 # reside on that node.  See memmap_init_zone()
 561 # for details.
 562 config NODES_SPAN_OTHER_NODES
 563         def_bool y
 564         depends on NEED_MULTIPLE_NODES
 565
 566 config STDBINUTILS
 567         bool "Using standard binutils settings"
 568         depends on 44x
 569         default y
 570         help
 571           Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
 572           Note, that kernel will be able to run only those applications,
 573           which had been compiled using binutils later than 2.17.50.0.3 with
 574           '-zmax-page-size' set to 256K (the default is 64K). Or, if using
 575           the older binutils, you can patch them with a trivial patch, which
 576           changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
 577
 578 choice
 579         prompt "Page size"
 580         default PPC_4K_PAGES
 581         help
 582           Select the kernel logical page size. Increasing the page size
 583           will reduce software overhead at each page boundary, allow
 584           hardware prefetch mechanisms to be more effective, and allow
 585           larger dma transfers increasing IO efficiency and reducing
 586           overhead. However the utilization of memory will increase.
 587           For example, each cached file will using a multiple of the
 588           page size to hold its contents and the difference between the
 589           end of file and the end of page is wasted.
 590
 591           Some dedicated systems, such as software raid serving with
 592           accelerated calculations, have shown significant increases.
 593
 594           If you configure a 64 bit kernel for 64k pages but the
 595           processor does not support them, then the kernel will simulate
 596           them with 4k pages, loading them on demand, but with the
 597           reduced software overhead and larger internal fragmentation.
 598           For the 32 bit kernel, a large page option will not be offered
 599           unless it is supported by the configured processor.
 600
 601           If unsure, choose 4K_PAGES.
 602
 603 config PPC_4K_PAGES
 604         bool "4k page size"
 605         select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
 606
 607 config PPC_16K_PAGES
 608         bool "16k page size"
 609         depends on 44x || PPC_8xx
 610
 611 config PPC_64K_PAGES
 612         bool "64k page size"
 613         depends on !PPC_FSL_BOOK3E && (44x || PPC_STD_MMU_64 || PPC_BOOK3E_64)
 614         select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
 615
 616 config PPC_256K_PAGES
 617         bool "256k page size"
 618         depends on 44x && !STDBINUTILS
 619         help
 620           Make the page size 256k.
 621
 622           As the ELF standard only requires alignment to support page
 623           sizes up to 64k, you will need to compile all of your user
 624           space applications with a non-standard binutils settings
 625           (see the STDBINUTILS description for details).
 626
 627           Say N unless you know what you are doing.
 628
 629 endchoice
 630
 631 config FORCE_MAX_ZONEORDER
 632         int "Maximum zone order"
 633         range 8 9 if PPC64 && PPC_64K_PAGES
 634         default "9" if PPC64 && PPC_64K_PAGES
 635         range 13 13 if PPC64 && !PPC_64K_PAGES
 636         default "13" if PPC64 && !PPC_64K_PAGES
 637         range 9 64 if PPC32 && PPC_16K_PAGES
 638         default "9" if PPC32 && PPC_16K_PAGES
 639         range 7 64 if PPC32 && PPC_64K_PAGES
 640         default "7" if PPC32 && PPC_64K_PAGES
 641         range 5 64 if PPC32 && PPC_256K_PAGES
 642         default "5" if PPC32 && PPC_256K_PAGES
 643         range 11 64
 644         default "11"
 645         help
 646           The kernel memory allocator divides physically contiguous memory
 647           blocks into "zones", where each zone is a power of two number of
 648           pages.  This option selects the largest power of two that the kernel
 649           keeps in the memory allocator.  If you need to allocate very large
 650           blocks of physically contiguous memory, then you may need to
 651           increase this value.
 652
 653           This config option is actually maximum order plus one. For example,
 654           a value of 11 means that the largest free memory block is 2^10 pages.
 655
 656           The page size is not necessarily 4KB.  For example, on 64-bit
 657           systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES.  Keep
 658           this in mind when choosing a value for this option.
 659
 660 config PPC_SUBPAGE_PROT
 661         bool "Support setting protections for 4k subpages"
 662         depends on PPC_STD_MMU_64 && PPC_64K_PAGES
 663         help
 664           This option adds support for a system call to allow user programs
 665           to set access permissions (read/write, readonly, or no access)
 666           on the 4k subpages of each 64k page.
 667
 668 config PPC_COPRO_BASE
 669         bool
 670         default n
 671
 672 config SCHED_SMT
 673         bool "SMT (Hyperthreading) scheduler support"
 674         depends on PPC64 && SMP
 675         help
 676           SMT scheduler support improves the CPU scheduler's decision making
 677           when dealing with POWER5 cpus at a cost of slightly increased
 678           overhead in some places. If unsure say N here.
 679
 680 config PPC_DENORMALISATION
 681         bool "PowerPC denormalisation exception handling"
 682         depends on PPC_BOOK3S_64
 683         default "y" if PPC_POWERNV
 684         ---help---
 685           Add support for handling denormalisation of single precision
 686           values.  Useful for bare metal only.  If unsure say Y here.
 687
 688 config CMDLINE_BOOL
 689         bool "Default bootloader kernel arguments"
 690
 691 config CMDLINE
 692         string "Initial kernel command string"
 693         depends on CMDLINE_BOOL
 694         default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
 695         help
 696           On some platforms, there is currently no way for the boot loader to
 697           pass arguments to the kernel. For these platforms, you can supply
 698           some command-line options at build time by entering them here.  In
 699           most cases you will need to specify the root device here.
 700
 701 config CMDLINE_FORCE
 702         bool "Always use the default kernel command string"
 703         depends on CMDLINE_BOOL
 704         help
 705           Always use the default kernel command string, even if the boot
 706           loader passes other arguments to the kernel.
 707           This is useful if you cannot or don't want to change the
 708           command-line options your boot loader passes to the kernel.
 709
 710 config EXTRA_TARGETS
 711         string "Additional default image types"
 712         help
 713           List additional targets to be built by the bootwrapper here (separated
 714           by spaces).  This is useful for targets that depend of device tree
 715           files in the .dts directory.
 716
 717           Targets in this list will be build as part of the default build
 718           target, or when the user does a 'make zImage' or a
 719           'make zImage.initrd'.
 720
 721           If unsure, leave blank
 722
 723 config ARCH_WANTS_FREEZER_CONTROL
 724         def_bool y
 725         depends on ADB_PMU
 726
 727 source kernel/power/Kconfig
 728
 729 config SECCOMP
 730         bool "Enable seccomp to safely compute untrusted bytecode"
 731         depends on PROC_FS
 732         default y
 733         help
 734           This kernel feature is useful for number crunching applications
 735           that may need to compute untrusted bytecode during their
 736           execution. By using pipes or other transports made available to
 737           the process as file descriptors supporting the read/write
 738           syscalls, it's possible to isolate those applications in
 739           their own address space using seccomp. Once seccomp is
 740           enabled via /proc/<pid>/seccomp, it cannot be disabled
 741           and the task is only allowed to execute a few safe syscalls
 742           defined by each seccomp mode.
 743
 744           If unsure, say Y. Only embedded should say N here.
 745
 746 endmenu
 747
 748 config ISA_DMA_API
 749         bool
 750         default PCI
 751
 752 menu "Bus options"
 753
 754 config ISA
 755         bool "Support for ISA-bus hardware"
 756         depends on PPC_CHRP
 757         select PPC_I8259
 758         help
 759           Find out whether you have ISA slots on your motherboard.  ISA is the
 760           name of a bus system, i.e. the way the CPU talks to the other stuff
 761           inside your box.  If you have an Apple machine, say N here; if you
 762           have an IBM RS/6000 or pSeries machine, say Y.  If you have an
 763           embedded board, consult your board documentation.
 764
 765 config ZONE_DMA
 766         bool
 767         default y
 768
 769 config NEED_DMA_MAP_STATE
 770         def_bool (PPC64 || NOT_COHERENT_CACHE)
 771
 772 config NEED_SG_DMA_LENGTH
 773         def_bool y
 774
 775 config GENERIC_ISA_DMA
 776         bool
 777         depends on ISA_DMA_API
 778         default y
 779
 780 config PPC_INDIRECT_PCI
 781         bool
 782         depends on PCI
 783         default y if 40x || 44x
 784         default n
 785
 786 config EISA
 787         bool
 788
 789 config SBUS
 790         bool
 791
 792 config FSL_SOC
 793         bool
 794
 795 config FSL_PCI
 796         bool
 797         select PPC_INDIRECT_PCI
 798         select PCI_QUIRKS
 799
 800 config FSL_PMC
 801         bool
 802         default y
 803         depends on SUSPEND && (PPC_85xx || PPC_86xx)
 804         help
 805           Freescale MPC85xx/MPC86xx power management controller support
 806           (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
 807
 808 config PPC4xx_CPM
 809         bool
 810         default y
 811         depends on SUSPEND && (44x || 40x)
 812         help
 813           PPC4xx Clock Power Management (CPM) support (suspend/resume).
 814           It also enables support for two different idle states (idle-wait
 815           and idle-doze).
 816
 817 config 4xx_SOC
 818         bool
 819
 820 config FSL_LBC
 821         bool "Freescale Local Bus support"
 822         help
 823           Enables reporting of errors from the Freescale local bus
 824           controller.  Also contains some common code used by
 825           drivers for specific local bus peripherals.
 826
 827 config FSL_GTM
 828         bool
 829         depends on PPC_83xx || QUICC_ENGINE || CPM2
 830         help
 831           Freescale General-purpose Timers support
 832
 833 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
 834 config MCA
 835         bool
 836
 837 # Platforms that what PCI turned unconditionally just do select PCI
 838 # in their config node.  Platforms that want to choose at config
 839 # time should select PPC_PCI_CHOICE
 840 config PPC_PCI_CHOICE
 841         bool
 842
 843 config PCI
 844         bool "PCI support" if PPC_PCI_CHOICE
 845         default y if !40x && !CPM2 && !8xx && !PPC_83xx \
 846                 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
 847         default PCI_QSPAN if !4xx && !CPM2 && 8xx
 848         select GENERIC_PCI_IOMAP
 849         help
 850           Find out whether your system includes a PCI bus. PCI is the name of
 851           a bus system, i.e. the way the CPU talks to the other stuff inside
 852           your box.  If you say Y here, the kernel will include drivers and
 853           infrastructure code to support PCI bus devices.
 854
 855 config PCI_DOMAINS
 856         def_bool PCI
 857
 858 config PCI_SYSCALL
 859         def_bool PCI
 860
 861 config PCI_QSPAN
 862         bool "QSpan PCI"
 863         depends on !4xx && !CPM2 && 8xx
 864         select PPC_I8259
 865         help
 866           Say Y here if you have a system based on a Motorola 8xx-series
 867           embedded processor with a QSPAN PCI interface, otherwise say N.
 868
 869 config PCI_8260
 870         bool
 871         depends on PCI && 8260
 872         select PPC_INDIRECT_PCI
 873         default y
 874
 875 source "drivers/pci/Kconfig"
 876
 877 source "drivers/pcmcia/Kconfig"
 878
 879 config HAS_RAPIDIO
 880         bool
 881         default n
 882
 883 config RAPIDIO
 884         tristate "RapidIO support"
 885         depends on HAS_RAPIDIO || PCI
 886         help
 887           If you say Y here, the kernel will include drivers and
 888           infrastructure code to support RapidIO interconnect devices.
 889
 890 config FSL_RIO
 891         bool "Freescale Embedded SRIO Controller support"
 892         depends on RAPIDIO = y && HAS_RAPIDIO
 893         default "n"
 894         ---help---
 895           Include support for RapidIO controller on Freescale embedded
 896           processors (MPC8548, MPC8641, etc).
 897
 898 source "drivers/rapidio/Kconfig"
 899
 900 endmenu
 901
 902 config NONSTATIC_KERNEL
 903         bool
 904         default n
 905
 906 menu "Advanced setup"
 907         depends on PPC32
 908
 909 config ADVANCED_OPTIONS
 910         bool "Prompt for advanced kernel configuration options"
 911         help
 912           This option will enable prompting for a variety of advanced kernel
 913           configuration options.  These options can cause the kernel to not
 914           work if they are set incorrectly, but can be used to optimize certain
 915           aspects of kernel memory management.
 916
 917           Unless you know what you are doing, say N here.
 918
 919 comment "Default settings for advanced configuration options are used"
 920         depends on !ADVANCED_OPTIONS
 921
 922 config LOWMEM_SIZE_BOOL
 923         bool "Set maximum low memory"
 924         depends on ADVANCED_OPTIONS
 925         help
 926           This option allows you to set the maximum amount of memory which
 927           will be used as "low memory", that is, memory which the kernel can
 928           access directly, without having to set up a kernel virtual mapping.
 929           This can be useful in optimizing the layout of kernel virtual
 930           memory.
 931
 932           Say N here unless you know what you are doing.
 933
 934 config LOWMEM_SIZE
 935         hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
 936         default "0x30000000"
 937
 938 config LOWMEM_CAM_NUM_BOOL
 939         bool "Set number of CAMs to use to map low memory"
 940         depends on ADVANCED_OPTIONS && FSL_BOOKE
 941         help
 942           This option allows you to set the maximum number of CAM slots that
 943           will be used to map low memory.  There are a limited number of slots
 944           available and even more limited number that will fit in the L1 MMU.
 945           However, using more entries will allow mapping more low memory.  This
 946           can be useful in optimizing the layout of kernel virtual memory.
 947
 948           Say N here unless you know what you are doing.
 949
 950 config LOWMEM_CAM_NUM
 951         depends on FSL_BOOKE
 952         int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
 953         default 3
 954
 955 config DYNAMIC_MEMSTART
 956         bool "Enable page aligned dynamic load address for kernel"
 957         depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
 958         select NONSTATIC_KERNEL
 959         help
 960           This option enables the kernel to be loaded at any page aligned
 961           physical address. The kernel creates a mapping from KERNELBASE to
 962           the address where the kernel is loaded. The page size here implies
 963           the TLB page size of the mapping for kernel on the particular platform.
 964           Please refer to the init code for finding the TLB page size.
 965
 966           DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
 967           kernel image, where the only restriction is the page aligned kernel
 968           load address. When this option is enabled, the compile time physical
 969           address CONFIG_PHYSICAL_START is ignored.
 970
 971           This option is overridden by CONFIG_RELOCATABLE
 972
 973 config PAGE_OFFSET_BOOL
 974         bool "Set custom page offset address"
 975         depends on ADVANCED_OPTIONS
 976         help
 977           This option allows you to set the kernel virtual address at which
 978           the kernel will map low memory.  This can be useful in optimizing
 979           the virtual memory layout of the system.
 980
 981           Say N here unless you know what you are doing.
 982
 983 config PAGE_OFFSET
 984         hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
 985         default "0xc0000000"
 986
 987 config KERNEL_START_BOOL
 988         bool "Set custom kernel base address"
 989         depends on ADVANCED_OPTIONS
 990         help
 991           This option allows you to set the kernel virtual address at which
 992           the kernel will be loaded.  Normally this should match PAGE_OFFSET
 993           however there are times (like kdump) that one might not want them
 994           to be the same.
 995
 996           Say N here unless you know what you are doing.
 997
 998 config KERNEL_START
 999         hex "Virtual address of kernel base" if KERNEL_START_BOOL
1000         default PAGE_OFFSET if PAGE_OFFSET_BOOL
1001         default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1002         default "0xc0000000"
1003
1004 config PHYSICAL_START_BOOL
1005         bool "Set physical address where the kernel is loaded"
1006         depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1007         help
1008           This gives the physical address where the kernel is loaded.
1009
1010           Say N here unless you know what you are doing.
1011
1012 config PHYSICAL_START
1013         hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1014         default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1015         default "0x00000000"
1016
1017 config PHYSICAL_ALIGN
1018         hex
1019         default "0x04000000" if FSL_BOOKE
1020         help
1021           This value puts the alignment restrictions on physical address
1022           where kernel is loaded and run from. Kernel is compiled for an
1023           address which meets above alignment restriction.
1024
1025 config TASK_SIZE_BOOL
1026         bool "Set custom user task size"
1027         depends on ADVANCED_OPTIONS
1028         help
1029           This option allows you to set the amount of virtual address space
1030           allocated to user tasks.  This can be useful in optimizing the
1031           virtual memory layout of the system.
1032
1033           Say N here unless you know what you are doing.
1034
1035 config TASK_SIZE
1036         hex "Size of user task space" if TASK_SIZE_BOOL
1037         default "0x80000000" if PPC_8xx
1038         default "0xc0000000"
1039
1040 config CONSISTENT_SIZE_BOOL
1041         bool "Set custom consistent memory pool size"
1042         depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1043         help
1044           This option allows you to set the size of the
1045           consistent memory pool.  This pool of virtual memory
1046           is used to make consistent memory allocations.
1047
1048 config CONSISTENT_SIZE
1049         hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1050         default "0x00200000" if NOT_COHERENT_CACHE
1051
1052 config PIN_TLB
1053         bool "Pinned Kernel TLBs (860 ONLY)"
1054         depends on ADVANCED_OPTIONS && 8xx
1055
1056 config PIN_TLB_IMMR
1057         bool "Pinned TLB for IMMR"
1058         depends on PIN_TLB
1059         default y
1060 endmenu
1061
1062 if PPC64
1063 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1064 config PAGE_OFFSET
1065         hex
1066         default "0xc000000000000000"
1067 config KERNEL_START
1068         hex
1069         default "0xc000000000000000"
1070 config PHYSICAL_START
1071         hex
1072         default "0x00000000"
1073 endif
1074
1075 config  ARCH_RANDOM
1076         def_bool n
1077
1078 source "net/Kconfig"
1079
1080 source "drivers/Kconfig"
1081
1082 source "fs/Kconfig"
1083
1084 source "lib/Kconfig"
1085
1086 source "arch/powerpc/Kconfig.debug"
1087
1088 source "security/Kconfig"
1089
1090 config KEYS_COMPAT
1091         bool
1092         depends on COMPAT && KEYS
1093         default y
1094
1095 source "crypto/Kconfig"
1096
1097 config PPC_LIB_RHEAP
1098         bool
1099
1100 source "arch/powerpc/kvm/Kconfig"
1101
1102 source "kernel/livepatch/Kconfig"