/arch/powerpc/Kconfig

   1source "arch/powerpc/platforms/Kconfig.cputype"
   2
   3config PPC32
   4	bool
   5	default y if !PPC64
   6
   7config 32BIT
   8	bool
   9	default y if PPC32
  10
  11config 64BIT
  12	bool
  13	default y if PPC64
  14
  15config WORD_SIZE
  16	int
  17	default 64 if PPC64
  18	default 32 if !PPC64
  19
  20config ARCH_PHYS_ADDR_T_64BIT
  21       def_bool PPC64 || PHYS_64BIT
  22
  23config ARCH_DMA_ADDR_T_64BIT
  24	def_bool ARCH_PHYS_ADDR_T_64BIT
  25
  26config MMU
  27	bool
  28	default y
  29
  30config HAVE_SETUP_PER_CPU_AREA
  31	def_bool PPC64
  32
  33config NEED_PER_CPU_EMBED_FIRST_CHUNK
  34	def_bool PPC64
  35
  36config NR_IRQS
  37	int "Number of virtual interrupt numbers"
  38	range 32 32768
  39	default "512"
  40	help
  41	  This defines the number of virtual interrupt numbers the kernel
  42	  can manage. Virtual interrupt numbers are what you see in
  43	  /proc/interrupts. If you configure your system to have too few,
  44	  drivers will fail to load or worse - handle with care.
  45
  46config STACKTRACE_SUPPORT
  47	bool
  48	default y
  49
  50config TRACE_IRQFLAGS_SUPPORT
  51	bool
  52	default y
  53
  54config LOCKDEP_SUPPORT
  55	bool
  56	default y
  57
  58config RWSEM_GENERIC_SPINLOCK
  59	bool
  60
  61config RWSEM_XCHGADD_ALGORITHM
  62	bool
  63	default y
  64
  65config GENERIC_LOCKBREAK
  66	bool
  67	default y
  68	depends on SMP && PREEMPT
  69
  70config ARCH_HAS_ILOG2_U32
  71	bool
  72	default y
  73
  74config ARCH_HAS_ILOG2_U64
  75	bool
  76	default y if 64BIT
  77
  78config GENERIC_HWEIGHT
  79	bool
  80	default y
  81
  82config ARCH_HAS_DMA_SET_COHERENT_MASK
  83        bool
  84
  85config PPC
  86	bool
  87	default y
  88	select ARCH_MIGHT_HAVE_PC_PARPORT
  89	select ARCH_MIGHT_HAVE_PC_SERIO
  90	select BINFMT_ELF
  91	select ARCH_HAS_ELF_RANDOMIZE
  92	select OF
  93	select OF_EARLY_FLATTREE
  94	select OF_RESERVED_MEM
  95	select HAVE_FTRACE_MCOUNT_RECORD
  96	select HAVE_DYNAMIC_FTRACE
  97	select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
  98	select HAVE_FUNCTION_TRACER
  99	select HAVE_FUNCTION_GRAPH_TRACER
 100	select SYSCTL_EXCEPTION_TRACE
 101	select VIRT_TO_BUS if !PPC64
 102	select HAVE_IDE
 103	select HAVE_IOREMAP_PROT
 104	select HAVE_EFFICIENT_UNALIGNED_ACCESS if !CPU_LITTLE_ENDIAN
 105	select HAVE_KPROBES
 106	select HAVE_ARCH_KGDB
 107	select HAVE_KRETPROBES
 108	select HAVE_ARCH_TRACEHOOK
 109	select HAVE_MEMBLOCK
 110	select HAVE_MEMBLOCK_NODE_MAP
 111	select HAVE_DMA_API_DEBUG
 112	select HAVE_OPROFILE
 113	select HAVE_DEBUG_KMEMLEAK
 114	select ARCH_HAS_SG_CHAIN
 115	select GENERIC_ATOMIC64 if PPC32
 116	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 117	select HAVE_PERF_EVENTS
 118	select HAVE_PERF_REGS
 119	select HAVE_PERF_USER_STACK_DUMP
 120	select HAVE_REGS_AND_STACK_ACCESS_API
 121	select HAVE_HW_BREAKPOINT if PERF_EVENTS && PPC_BOOK3S_64
 122	select ARCH_WANT_IPC_PARSE_VERSION
 123	select SPARSE_IRQ
 124	select IRQ_DOMAIN
 125	select GENERIC_IRQ_SHOW
 126	select GENERIC_IRQ_SHOW_LEVEL
 127	select IRQ_FORCED_THREADING
 128	select HAVE_RCU_TABLE_FREE if SMP
 129	select HAVE_SYSCALL_TRACEPOINTS
 130	select HAVE_CBPF_JIT if !PPC64
 131	select HAVE_EBPF_JIT if PPC64
 132	select HAVE_ARCH_JUMP_LABEL
 133	select ARCH_HAVE_NMI_SAFE_CMPXCHG
 134	select ARCH_HAS_GCOV_PROFILE_ALL
 135	select GENERIC_SMP_IDLE_THREAD
 136	select GENERIC_CMOS_UPDATE
 137	select GENERIC_TIME_VSYSCALL_OLD
 138	select GENERIC_CLOCKEVENTS
 139	select GENERIC_CLOCKEVENTS_BROADCAST if SMP
 140	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
 141	select GENERIC_STRNCPY_FROM_USER
 142	select GENERIC_STRNLEN_USER
 143	select HAVE_MOD_ARCH_SPECIFIC
 144	select MODULES_USE_ELF_RELA
 145	select CLONE_BACKWARDS
 146	select ARCH_USE_BUILTIN_BSWAP
 147	select OLD_SIGSUSPEND
 148	select OLD_SIGACTION if PPC32
 149	select HAVE_DEBUG_STACKOVERFLOW
 150	select HAVE_IRQ_EXIT_ON_IRQ_STACK
 151	select ARCH_USE_CMPXCHG_LOCKREF if PPC64
 152	select HAVE_ARCH_AUDITSYSCALL
 153	select ARCH_SUPPORTS_ATOMIC_RMW
 154	select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
 155	select NO_BOOTMEM
 156	select HAVE_GENERIC_RCU_GUP
 157	select HAVE_PERF_EVENTS_NMI if PPC64
 158	select HAVE_NMI if PERF_EVENTS
 159	select EDAC_SUPPORT
 160	select EDAC_ATOMIC_SCRUB
 161	select ARCH_HAS_DMA_SET_COHERENT_MASK
 162	select ARCH_HAS_DEVMEM_IS_ALLOWED
 163	select HAVE_ARCH_SECCOMP_FILTER
 164	select ARCH_HAS_UBSAN_SANITIZE_ALL
 165	select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
 166	select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
 167	select GENERIC_CPU_AUTOPROBE
 168	select HAVE_VIRT_CPU_ACCOUNTING
 169	select HAVE_ARCH_HARDENED_USERCOPY
 170
 171config GENERIC_CSUM
 172	def_bool CPU_LITTLE_ENDIAN
 173
 174config EARLY_PRINTK
 175	bool
 176	default y
 177
 178config PANIC_TIMEOUT
 179	int
 180	default 180
 181
 182config COMPAT
 183	bool
 184	default y if PPC64
 185	select COMPAT_BINFMT_ELF
 186	select ARCH_WANT_OLD_COMPAT_IPC
 187	select COMPAT_OLD_SIGACTION
 188
 189config SYSVIPC_COMPAT
 190	bool
 191	depends on COMPAT && SYSVIPC
 192	default y
 193
 194# All PPC32s use generic nvram driver through ppc_md
 195config GENERIC_NVRAM
 196	bool
 197	default y if PPC32
 198
 199config SCHED_OMIT_FRAME_POINTER
 200	bool
 201	default y
 202
 203config ARCH_MAY_HAVE_PC_FDC
 204	bool
 205	default PCI
 206
 207config PPC_UDBG_16550
 208	bool
 209	default n
 210
 211config GENERIC_TBSYNC
 212	bool
 213	default y if PPC32 && SMP
 214	default n
 215
 216config AUDIT_ARCH
 217	bool
 218	default y
 219
 220config GENERIC_BUG
 221	bool
 222	default y
 223	depends on BUG
 224
 225config SYS_SUPPORTS_APM_EMULATION
 226	default y if PMAC_APM_EMU
 227	bool
 228
 229config EPAPR_BOOT
 230	bool
 231	help
 232	  Used to allow a board to specify it wants an ePAPR compliant wrapper.
 233	default n
 234
 235config DEFAULT_UIMAGE
 236	bool
 237	help
 238	  Used to allow a board to specify it wants a uImage built by default
 239	default n
 240
 241config ARCH_HIBERNATION_POSSIBLE
 242	bool
 243	default y
 244
 245config ARCH_SUSPEND_POSSIBLE
 246	def_bool y
 247	depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
 248		   (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
 249		   || 44x || 40x
 250
 251config PPC_DCR_NATIVE
 252	bool
 253	default n
 254
 255config PPC_DCR_MMIO
 256	bool
 257	default n
 258
 259config PPC_DCR
 260	bool
 261	depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
 262	default y
 263
 264config PPC_OF_PLATFORM_PCI
 265	bool
 266	depends on PCI
 267	depends on PPC64 # not supported on 32 bits yet
 268	default n
 269
 270config ARCH_SUPPORTS_DEBUG_PAGEALLOC
 271	depends on PPC32 || PPC_STD_MMU_64
 272	def_bool y
 273
 274config ARCH_SUPPORTS_UPROBES
 275	def_bool y
 276
 277config PPC_ADV_DEBUG_REGS
 278	bool
 279	depends on 40x || BOOKE
 280	default y
 281
 282config PPC_ADV_DEBUG_IACS
 283	int
 284	depends on PPC_ADV_DEBUG_REGS
 285	default 4 if 44x
 286	default 2
 287
 288config PPC_ADV_DEBUG_DACS
 289	int
 290	depends on PPC_ADV_DEBUG_REGS
 291	default 2
 292
 293config PPC_ADV_DEBUG_DVCS
 294	int
 295	depends on PPC_ADV_DEBUG_REGS
 296	default 2 if 44x
 297	default 0
 298
 299config PPC_ADV_DEBUG_DAC_RANGE
 300	bool
 301	depends on PPC_ADV_DEBUG_REGS && 44x
 302	default y
 303
 304config PPC_EMULATE_SSTEP
 305	bool
 306	default y if KPROBES || UPROBES || XMON || HAVE_HW_BREAKPOINT
 307
 308config ZONE_DMA32
 309	bool
 310	default y if PPC64
 311
 312config PGTABLE_LEVELS
 313	int
 314	default 2 if !PPC64
 315	default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
 316	default 4
 317
 318source "init/Kconfig"
 319
 320source "kernel/Kconfig.freezer"
 321
 322source "arch/powerpc/sysdev/Kconfig"
 323source "arch/powerpc/platforms/Kconfig"
 324
 325menu "Kernel options"
 326
 327config HIGHMEM
 328	bool "High memory support"
 329	depends on PPC32
 330
 331source kernel/Kconfig.hz
 332source kernel/Kconfig.preempt
 333source "fs/Kconfig.binfmt"
 334
 335config HUGETLB_PAGE_SIZE_VARIABLE
 336	bool
 337	depends on HUGETLB_PAGE
 338	default y
 339
 340config MATH_EMULATION
 341	bool "Math emulation"
 342	depends on 4xx || 8xx || PPC_MPC832x || BOOKE
 343	---help---
 344	  Some PowerPC chips designed for embedded applications do not have
 345	  a floating-point unit and therefore do not implement the
 346	  floating-point instructions in the PowerPC instruction set.  If you
 347	  say Y here, the kernel will include code to emulate a floating-point
 348	  unit, which will allow programs that use floating-point
 349	  instructions to run.
 350
 351	  This is also useful to emulate missing (optional) instructions
 352	  such as fsqrt on cores that do have an FPU but do not implement
 353	  them (such as Freescale BookE).
 354
 355choice
 356	prompt "Math emulation options"
 357	default MATH_EMULATION_FULL
 358	depends on MATH_EMULATION
 359
 360config	MATH_EMULATION_FULL
 361	bool "Emulate all the floating point instructions"
 362	---help---
 363	  Select this option will enable the kernel to support to emulate
 364	  all the floating point instructions. If your SoC doesn't have
 365	  a FPU, you should select this.
 366
 367config MATH_EMULATION_HW_UNIMPLEMENTED
 368	bool "Just emulate the FPU unimplemented instructions"
 369	---help---
 370	  Select this if you know there does have a hardware FPU on your
 371	  SoC, but some floating point instructions are not implemented by that.
 372
 373endchoice
 374
 375config PPC_TRANSACTIONAL_MEM
 376       bool "Transactional Memory support for POWERPC"
 377       depends on PPC_BOOK3S_64
 378       depends on SMP
 379       select ALTIVEC
 380       select VSX
 381       default n
 382       ---help---
 383         Support user-mode Transactional Memory on POWERPC.
 384
 385config DISABLE_MPROFILE_KERNEL
 386	bool "Disable use of mprofile-kernel for kernel tracing"
 387	depends on PPC64 && CPU_LITTLE_ENDIAN
 388	default y
 389	help
 390	  Selecting this options disables use of the mprofile-kernel ABI for
 391	  kernel tracing. That will cause options such as live patching
 392	  (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
 393	  be disabled also.
 394
 395	  If you have a toolchain which supports mprofile-kernel, then you can
 396	  enable this. Otherwise leave it disabled. If you're not sure, say
 397	  "N".
 398
 399config MPROFILE_KERNEL
 400	depends on PPC64 && CPU_LITTLE_ENDIAN
 401	def_bool !DISABLE_MPROFILE_KERNEL
 402
 403config IOMMU_HELPER
 404	def_bool PPC64
 405
 406config SWIOTLB
 407	bool "SWIOTLB support"
 408	default n
 409	select IOMMU_HELPER
 410	---help---
 411	  Support for IO bounce buffering for systems without an IOMMU.
 412	  This allows us to DMA to the full physical address space on
 413	  platforms where the size of a physical address is larger
 414	  than the bus address.  Not all platforms support this.
 415
 416config HOTPLUG_CPU
 417	bool "Support for enabling/disabling CPUs"
 418	depends on SMP && (PPC_PSERIES || \
 419	PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
 420	---help---
 421	  Say Y here to be able to disable and re-enable individual
 422	  CPUs at runtime on SMP machines.
 423
 424	  Say N if you are unsure.
 425
 426config ARCH_CPU_PROBE_RELEASE
 427	def_bool y
 428	depends on HOTPLUG_CPU
 429
 430config ARCH_ENABLE_MEMORY_HOTPLUG
 431	def_bool y
 432
 433config ARCH_HAS_WALK_MEMORY
 434	def_bool y
 435
 436config ARCH_ENABLE_MEMORY_HOTREMOVE
 437	def_bool y
 438
 439config PPC64_SUPPORTS_MEMORY_FAILURE
 440	bool "Add support for memory hwpoison"
 441	depends on PPC_BOOK3S_64
 442	default "y" if PPC_POWERNV
 443	select ARCH_SUPPORTS_MEMORY_FAILURE
 444
 445config KEXEC
 446	bool "kexec system call"
 447	depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
 448	select KEXEC_CORE
 449	help
 450	  kexec is a system call that implements the ability to shutdown your
 451	  current kernel, and to start another kernel.  It is like a reboot
 452	  but it is independent of the system firmware.   And like a reboot
 453	  you can start any kernel with it, not just Linux.
 454
 455	  The name comes from the similarity to the exec system call.
 456
 457	  It is an ongoing process to be certain the hardware in a machine
 458	  is properly shutdown, so do not be surprised if this code does not
 459	  initially work for you.  As of this writing the exact hardware
 460	  interface is strongly in flux, so no good recommendation can be
 461	  made.
 462
 463config RELOCATABLE
 464	bool "Build a relocatable kernel"
 465	depends on (PPC64 && !COMPILE_TEST) || (FLATMEM && (44x || FSL_BOOKE))
 466	select NONSTATIC_KERNEL
 467	help
 468	  This builds a kernel image that is capable of running at the
 469	  location the kernel is loaded at. For ppc32, there is no any
 470	  alignment restrictions, and this feature is a superset of
 471	  DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
 472	  16k-aligned base address. The kernel is linked as a
 473	  position-independent executable (PIE) and contains dynamic relocations
 474	  which are processed early in the bootup process.
 475
 476	  One use is for the kexec on panic case where the recovery kernel
 477	  must live at a different physical address than the primary
 478	  kernel.
 479
 480	  Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
 481	  it has been loaded at and the compile time physical addresses
 482	  CONFIG_PHYSICAL_START is ignored.  However CONFIG_PHYSICAL_START
 483	  setting can still be useful to bootwrappers that need to know the
 484	  load address of the kernel (eg. u-boot/mkimage).
 485
 486config CRASH_DUMP
 487	bool "Build a kdump crash kernel"
 488	depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
 489	select RELOCATABLE if (PPC64 && !COMPILE_TEST) || 44x || FSL_BOOKE
 490	help
 491	  Build a kernel suitable for use as a kdump capture kernel.
 492	  The same kernel binary can be used as production kernel and dump
 493	  capture kernel.
 494
 495config FA_DUMP
 496	bool "Firmware-assisted dump"
 497	depends on PPC64 && PPC_RTAS && CRASH_DUMP && KEXEC
 498	help
 499	  A robust mechanism to get reliable kernel crash dump with
 500	  assistance from firmware. This approach does not use kexec,
 501	  instead firmware assists in booting the kdump kernel
 502	  while preserving memory contents. Firmware-assisted dump
 503	  is meant to be a kdump replacement offering robustness and
 504	  speed not possible without system firmware assistance.
 505
 506	  If unsure, say "N"
 507
 508config IRQ_ALL_CPUS
 509	bool "Distribute interrupts on all CPUs by default"
 510	depends on SMP
 511	help
 512	  This option gives the kernel permission to distribute IRQs across
 513	  multiple CPUs.  Saying N here will route all IRQs to the first
 514	  CPU.  Generally saying Y is safe, although some problems have been
 515	  reported with SMP Power Macintoshes with this option enabled.
 516
 517config NUMA
 518	bool "NUMA support"
 519	depends on PPC64
 520	default y if SMP && PPC_PSERIES
 521
 522config NODES_SHIFT
 523	int
 524	default "8" if PPC64
 525	default "4"
 526	depends on NEED_MULTIPLE_NODES
 527
 528config USE_PERCPU_NUMA_NODE_ID
 529	def_bool y
 530	depends on NUMA
 531
 532config HAVE_MEMORYLESS_NODES
 533	def_bool y
 534	depends on NUMA
 535
 536config ARCH_SELECT_MEMORY_MODEL
 537	def_bool y
 538	depends on PPC64
 539
 540config ARCH_FLATMEM_ENABLE
 541	def_bool y
 542	depends on (PPC64 && !NUMA) || PPC32
 543
 544config ARCH_SPARSEMEM_ENABLE
 545	def_bool y
 546	depends on PPC64
 547	select SPARSEMEM_VMEMMAP_ENABLE
 548
 549config ARCH_SPARSEMEM_DEFAULT
 550	def_bool y
 551	depends on (SMP && PPC_PSERIES) || PPC_PS3
 552
 553config SYS_SUPPORTS_HUGETLBFS
 554	bool
 555
 556source "mm/Kconfig"
 557
 558config ARCH_MEMORY_PROBE
 559	def_bool y
 560	depends on MEMORY_HOTPLUG
 561
 562# Some NUMA nodes have memory ranges that span
 563# other nodes.  Even though a pfn is valid and
 564# between a node's start and end pfns, it may not
 565# reside on that node.  See memmap_init_zone()
 566# for details.
 567config NODES_SPAN_OTHER_NODES
 568	def_bool y
 569	depends on NEED_MULTIPLE_NODES
 570
 571config STDBINUTILS
 572	bool "Using standard binutils settings"
 573	depends on 44x
 574	default y
 575	help
 576	  Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
 577	  Note, that kernel will be able to run only those applications,
 578	  which had been compiled using binutils later than 2.17.50.0.3 with
 579	  '-zmax-page-size' set to 256K (the default is 64K). Or, if using
 580	  the older binutils, you can patch them with a trivial patch, which
 581	  changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
 582
 583choice
 584	prompt "Page size"
 585	default PPC_4K_PAGES
 586	help
 587	  Select the kernel logical page size. Increasing the page size
 588	  will reduce software overhead at each page boundary, allow
 589	  hardware prefetch mechanisms to be more effective, and allow
 590	  larger dma transfers increasing IO efficiency and reducing
 591	  overhead. However the utilization of memory will increase.
 592	  For example, each cached file will using a multiple of the
 593	  page size to hold its contents and the difference between the
 594	  end of file and the end of page is wasted.
 595
 596	  Some dedicated systems, such as software raid serving with
 597	  accelerated calculations, have shown significant increases.
 598
 599	  If you configure a 64 bit kernel for 64k pages but the
 600	  processor does not support them, then the kernel will simulate
 601	  them with 4k pages, loading them on demand, but with the
 602	  reduced software overhead and larger internal fragmentation.
 603	  For the 32 bit kernel, a large page option will not be offered
 604	  unless it is supported by the configured processor.
 605
 606	  If unsure, choose 4K_PAGES.
 607
 608config PPC_4K_PAGES
 609	bool "4k page size"
 610	select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
 611
 612config PPC_16K_PAGES
 613	bool "16k page size"
 614	depends on 44x || PPC_8xx
 615
 616config PPC_64K_PAGES
 617	bool "64k page size"
 618	depends on !PPC_FSL_BOOK3E && (44x || PPC_STD_MMU_64 || PPC_BOOK3E_64)
 619	select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
 620
 621config PPC_256K_PAGES
 622	bool "256k page size"
 623	depends on 44x && !STDBINUTILS
 624	help
 625	  Make the page size 256k.
 626
 627	  As the ELF standard only requires alignment to support page
 628	  sizes up to 64k, you will need to compile all of your user
 629	  space applications with a non-standard binutils settings
 630	  (see the STDBINUTILS description for details).
 631
 632	  Say N unless you know what you are doing.
 633
 634endchoice
 635
 636config FORCE_MAX_ZONEORDER
 637	int "Maximum zone order"
 638	range 8 9 if PPC64 && PPC_64K_PAGES
 639	default "9" if PPC64 && PPC_64K_PAGES
 640	range 9 13 if PPC64 && !PPC_64K_PAGES
 641	default "13" if PPC64 && !PPC_64K_PAGES
 642	range 9 64 if PPC32 && PPC_16K_PAGES
 643	default "9" if PPC32 && PPC_16K_PAGES
 644	range 7 64 if PPC32 && PPC_64K_PAGES
 645	default "7" if PPC32 && PPC_64K_PAGES
 646	range 5 64 if PPC32 && PPC_256K_PAGES
 647	default "5" if PPC32 && PPC_256K_PAGES
 648	range 11 64
 649	default "11"
 650	help
 651	  The kernel memory allocator divides physically contiguous memory
 652	  blocks into "zones", where each zone is a power of two number of
 653	  pages.  This option selects the largest power of two that the kernel
 654	  keeps in the memory allocator.  If you need to allocate very large
 655	  blocks of physically contiguous memory, then you may need to
 656	  increase this value.
 657
 658	  This config option is actually maximum order plus one. For example,
 659	  a value of 11 means that the largest free memory block is 2^10 pages.
 660
 661	  The page size is not necessarily 4KB.  For example, on 64-bit
 662	  systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES.  Keep
 663	  this in mind when choosing a value for this option.
 664
 665config PPC_SUBPAGE_PROT
 666	bool "Support setting protections for 4k subpages"
 667	depends on PPC_STD_MMU_64 && PPC_64K_PAGES
 668	help
 669	  This option adds support for a system call to allow user programs
 670	  to set access permissions (read/write, readonly, or no access)
 671	  on the 4k subpages of each 64k page.
 672
 673config PPC_COPRO_BASE
 674	bool
 675	default n
 676
 677config SCHED_SMT
 678	bool "SMT (Hyperthreading) scheduler support"
 679	depends on PPC64 && SMP
 680	help
 681	  SMT scheduler support improves the CPU scheduler's decision making
 682	  when dealing with POWER5 cpus at a cost of slightly increased
 683	  overhead in some places. If unsure say N here.
 684
 685config PPC_DENORMALISATION
 686	bool "PowerPC denormalisation exception handling"
 687	depends on PPC_BOOK3S_64
 688	default "y" if PPC_POWERNV
 689	---help---
 690	  Add support for handling denormalisation of single precision
 691	  values.  Useful for bare metal only.  If unsure say Y here.
 692
 693config CMDLINE_BOOL
 694	bool "Default bootloader kernel arguments"
 695
 696config CMDLINE
 697	string "Initial kernel command string"
 698	depends on CMDLINE_BOOL
 699	default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
 700	help
 701	  On some platforms, there is currently no way for the boot loader to
 702	  pass arguments to the kernel. For these platforms, you can supply
 703	  some command-line options at build time by entering them here.  In
 704	  most cases you will need to specify the root device here.
 705
 706config CMDLINE_FORCE
 707	bool "Always use the default kernel command string"
 708	depends on CMDLINE_BOOL
 709	help
 710	  Always use the default kernel command string, even if the boot
 711	  loader passes other arguments to the kernel.
 712	  This is useful if you cannot or don't want to change the
 713	  command-line options your boot loader passes to the kernel.
 714
 715config EXTRA_TARGETS
 716	string "Additional default image types"
 717	help
 718	  List additional targets to be built by the bootwrapper here (separated
 719	  by spaces).  This is useful for targets that depend of device tree
 720	  files in the .dts directory.
 721
 722	  Targets in this list will be build as part of the default build
 723	  target, or when the user does a 'make zImage' or a
 724	  'make zImage.initrd'.
 725
 726	  If unsure, leave blank
 727
 728config ARCH_WANTS_FREEZER_CONTROL
 729	def_bool y
 730	depends on ADB_PMU
 731
 732source kernel/power/Kconfig
 733
 734config SECCOMP
 735	bool "Enable seccomp to safely compute untrusted bytecode"
 736	depends on PROC_FS
 737	default y
 738	help
 739	  This kernel feature is useful for number crunching applications
 740	  that may need to compute untrusted bytecode during their
 741	  execution. By using pipes or other transports made available to
 742	  the process as file descriptors supporting the read/write
 743	  syscalls, it's possible to isolate those applications in
 744	  their own address space using seccomp. Once seccomp is
 745	  enabled via /proc/<pid>/seccomp, it cannot be disabled
 746	  and the task is only allowed to execute a few safe syscalls
 747	  defined by each seccomp mode.
 748
 749	  If unsure, say Y. Only embedded should say N here.
 750
 751endmenu
 752
 753config ISA_DMA_API
 754	bool
 755	default PCI
 756
 757menu "Bus options"
 758
 759config ISA
 760	bool "Support for ISA-bus hardware"
 761	depends on PPC_CHRP
 762	select PPC_I8259
 763	help
 764	  Find out whether you have ISA slots on your motherboard.  ISA is the
 765	  name of a bus system, i.e. the way the CPU talks to the other stuff
 766	  inside your box.  If you have an Apple machine, say N here; if you
 767	  have an IBM RS/6000 or pSeries machine, say Y.  If you have an
 768	  embedded board, consult your board documentation.
 769
 770config ZONE_DMA
 771	bool
 772	default y
 773
 774config NEED_DMA_MAP_STATE
 775	def_bool (PPC64 || NOT_COHERENT_CACHE)
 776
 777config NEED_SG_DMA_LENGTH
 778	def_bool y
 779
 780config GENERIC_ISA_DMA
 781	bool
 782	depends on ISA_DMA_API
 783	default y
 784
 785config PPC_INDIRECT_PCI
 786	bool
 787	depends on PCI
 788	default y if 40x || 44x
 789	default n
 790
 791config EISA
 792	bool
 793
 794config SBUS
 795	bool
 796
 797config FSL_SOC
 798	bool
 799
 800config FSL_PCI
 801 	bool
 802	select PPC_INDIRECT_PCI
 803	select PCI_QUIRKS
 804
 805config FSL_PMC
 806	bool
 807	default y
 808	depends on SUSPEND && (PPC_85xx || PPC_86xx)
 809	help
 810	  Freescale MPC85xx/MPC86xx power management controller support
 811	  (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
 812
 813config PPC4xx_CPM
 814	bool
 815	default y
 816	depends on SUSPEND && (44x || 40x)
 817	help
 818	  PPC4xx Clock Power Management (CPM) support (suspend/resume).
 819	  It also enables support for two different idle states (idle-wait
 820	  and idle-doze).
 821
 822config 4xx_SOC
 823	bool
 824
 825config FSL_LBC
 826	bool "Freescale Local Bus support"
 827	help
 828	  Enables reporting of errors from the Freescale local bus
 829	  controller.  Also contains some common code used by
 830	  drivers for specific local bus peripherals.
 831
 832config FSL_GTM
 833	bool
 834	depends on PPC_83xx || QUICC_ENGINE || CPM2
 835	help
 836	  Freescale General-purpose Timers support
 837
 838# Yes MCA RS/6000s exist but Linux-PPC does not currently support any
 839config MCA
 840	bool
 841
 842# Platforms that what PCI turned unconditionally just do select PCI
 843# in their config node.  Platforms that want to choose at config
 844# time should select PPC_PCI_CHOICE
 845config PPC_PCI_CHOICE
 846	bool
 847
 848config PCI
 849	bool "PCI support" if PPC_PCI_CHOICE
 850	default y if !40x && !CPM2 && !8xx && !PPC_83xx \
 851		&& !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
 852	default PCI_QSPAN if !4xx && !CPM2 && 8xx
 853	select GENERIC_PCI_IOMAP
 854	help
 855	  Find out whether your system includes a PCI bus. PCI is the name of
 856	  a bus system, i.e. the way the CPU talks to the other stuff inside
 857	  your box.  If you say Y here, the kernel will include drivers and
 858	  infrastructure code to support PCI bus devices.
 859
 860config PCI_DOMAINS
 861	def_bool PCI
 862
 863config PCI_SYSCALL
 864	def_bool PCI
 865
 866config PCI_QSPAN
 867	bool "QSpan PCI"
 868	depends on !4xx && !CPM2 && 8xx
 869	select PPC_I8259
 870	help
 871	  Say Y here if you have a system based on a Motorola 8xx-series
 872	  embedded processor with a QSPAN PCI interface, otherwise say N.
 873
 874config PCI_8260
 875	bool
 876	depends on PCI && 8260
 877	select PPC_INDIRECT_PCI
 878	default y
 879
 880source "drivers/pci/Kconfig"
 881
 882source "drivers/pcmcia/Kconfig"
 883
 884config HAS_RAPIDIO
 885	bool
 886	default n
 887
 888config RAPIDIO
 889	tristate "RapidIO support"
 890	depends on HAS_RAPIDIO || PCI
 891	help
 892	  If you say Y here, the kernel will include drivers and
 893	  infrastructure code to support RapidIO interconnect devices.
 894
 895config FSL_RIO
 896	bool "Freescale Embedded SRIO Controller support"
 897	depends on RAPIDIO = y && HAS_RAPIDIO
 898	default "n"
 899	---help---
 900	  Include support for RapidIO controller on Freescale embedded
 901	  processors (MPC8548, MPC8641, etc).
 902
 903source "drivers/rapidio/Kconfig"
 904
 905endmenu
 906
 907config NONSTATIC_KERNEL
 908	bool
 909	default n
 910
 911menu "Advanced setup"
 912	depends on PPC32
 913
 914config ADVANCED_OPTIONS
 915	bool "Prompt for advanced kernel configuration options"
 916	help
 917	  This option will enable prompting for a variety of advanced kernel
 918	  configuration options.  These options can cause the kernel to not
 919	  work if they are set incorrectly, but can be used to optimize certain
 920	  aspects of kernel memory management.
 921
 922	  Unless you know what you are doing, say N here.
 923
 924comment "Default settings for advanced configuration options are used"
 925	depends on !ADVANCED_OPTIONS
 926
 927config LOWMEM_SIZE_BOOL
 928	bool "Set maximum low memory"
 929	depends on ADVANCED_OPTIONS
 930	help
 931	  This option allows you to set the maximum amount of memory which
 932	  will be used as "low memory", that is, memory which the kernel can
 933	  access directly, without having to set up a kernel virtual mapping.
 934	  This can be useful in optimizing the layout of kernel virtual
 935	  memory.
 936
 937	  Say N here unless you know what you are doing.
 938
 939config LOWMEM_SIZE
 940	hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
 941	default "0x30000000"
 942
 943config LOWMEM_CAM_NUM_BOOL
 944	bool "Set number of CAMs to use to map low memory"
 945	depends on ADVANCED_OPTIONS && FSL_BOOKE
 946	help
 947	  This option allows you to set the maximum number of CAM slots that
 948	  will be used to map low memory.  There are a limited number of slots
 949	  available and even more limited number that will fit in the L1 MMU.
 950	  However, using more entries will allow mapping more low memory.  This
 951	  can be useful in optimizing the layout of kernel virtual memory.
 952
 953	  Say N here unless you know what you are doing.
 954
 955config LOWMEM_CAM_NUM
 956	depends on FSL_BOOKE
 957	int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
 958	default 3
 959
 960config DYNAMIC_MEMSTART
 961	bool "Enable page aligned dynamic load address for kernel"
 962	depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
 963	select NONSTATIC_KERNEL
 964	help
 965	  This option enables the kernel to be loaded at any page aligned
 966	  physical address. The kernel creates a mapping from KERNELBASE to 
 967	  the address where the kernel is loaded. The page size here implies
 968	  the TLB page size of the mapping for kernel on the particular platform.
 969	  Please refer to the init code for finding the TLB page size.
 970
 971	  DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
 972	  kernel image, where the only restriction is the page aligned kernel
 973	  load address. When this option is enabled, the compile time physical 
 974	  address CONFIG_PHYSICAL_START is ignored.
 975
 976	  This option is overridden by CONFIG_RELOCATABLE
 977
 978config PAGE_OFFSET_BOOL
 979	bool "Set custom page offset address"
 980	depends on ADVANCED_OPTIONS
 981	help
 982	  This option allows you to set the kernel virtual address at which
 983	  the kernel will map low memory.  This can be useful in optimizing
 984	  the virtual memory layout of the system.
 985
 986	  Say N here unless you know what you are doing.
 987
 988config PAGE_OFFSET
 989	hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
 990	default "0xc0000000"
 991
 992config KERNEL_START_BOOL
 993	bool "Set custom kernel base address"
 994	depends on ADVANCED_OPTIONS
 995	help
 996	  This option allows you to set the kernel virtual address at which
 997	  the kernel will be loaded.  Normally this should match PAGE_OFFSET
 998	  however there are times (like kdump) that one might not want them
 999	  to be the same.
1000
1001	  Say N here unless you know what you are doing.
1002
1003config KERNEL_START
1004	hex "Virtual address of kernel base" if KERNEL_START_BOOL
1005	default PAGE_OFFSET if PAGE_OFFSET_BOOL
1006	default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1007	default "0xc0000000"
1008
1009config PHYSICAL_START_BOOL
1010	bool "Set physical address where the kernel is loaded"
1011	depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1012	help
1013	  This gives the physical address where the kernel is loaded.
1014
1015	  Say N here unless you know what you are doing.
1016
1017config PHYSICAL_START
1018	hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1019	default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1020	default "0x00000000"
1021
1022config PHYSICAL_ALIGN
1023	hex
1024	default "0x04000000" if FSL_BOOKE
1025	help
1026	  This value puts the alignment restrictions on physical address
1027	  where kernel is loaded and run from. Kernel is compiled for an
1028	  address which meets above alignment restriction.
1029
1030config TASK_SIZE_BOOL
1031	bool "Set custom user task size"
1032	depends on ADVANCED_OPTIONS
1033	help
1034	  This option allows you to set the amount of virtual address space
1035	  allocated to user tasks.  This can be useful in optimizing the
1036	  virtual memory layout of the system.
1037
1038	  Say N here unless you know what you are doing.
1039
1040config TASK_SIZE
1041	hex "Size of user task space" if TASK_SIZE_BOOL
1042	default "0x80000000" if PPC_8xx
1043	default "0xc0000000"
1044
1045config CONSISTENT_SIZE_BOOL
1046	bool "Set custom consistent memory pool size"
1047	depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1048	help
1049	  This option allows you to set the size of the
1050	  consistent memory pool.  This pool of virtual memory
1051	  is used to make consistent memory allocations.
1052
1053config CONSISTENT_SIZE
1054	hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1055	default "0x00200000" if NOT_COHERENT_CACHE
1056
1057config PIN_TLB
1058	bool "Pinned Kernel TLBs (860 ONLY)"
1059	depends on ADVANCED_OPTIONS && 8xx
1060
1061config PIN_TLB_IMMR
1062	bool "Pinned TLB for IMMR"
1063	depends on PIN_TLB
1064	default y
1065endmenu
1066
1067if PPC64
1068# This value must have zeroes in the bottom 60 bits otherwise lots will break
1069config PAGE_OFFSET
1070	hex
1071	default "0xc000000000000000"
1072config KERNEL_START
1073	hex
1074	default "0xc000000000000000"
1075config PHYSICAL_START
1076	hex
1077	default "0x00000000"
1078endif
1079
1080config	ARCH_RANDOM
1081	def_bool n
1082
1083source "net/Kconfig"
1084
1085source "drivers/Kconfig"
1086
1087source "fs/Kconfig"
1088
1089source "lib/Kconfig"
1090
1091source "arch/powerpc/Kconfig.debug"
1092
1093source "security/Kconfig"
1094
1095config KEYS_COMPAT
1096	bool
1097	depends on COMPAT && KEYS
1098	default y
1099
1100source "crypto/Kconfig"
1101
1102config PPC_LIB_RHEAP
1103	bool
1104
1105source "arch/powerpc/kvm/Kconfig"
1106
1107source "kernel/livepatch/Kconfig"