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 MMU
  17         bool
  18         default y
  19
  20 config ARCH_MMAP_RND_BITS_MAX
  21         # On Book3S 64, the default virtual address space for 64-bit processes
  22         # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
  23         # 32T of address space (2^45), which should ensure a reasonable gap
  24         # between bottom-up and top-down allocations for applications that
  25         # consume "normal" amounts of address space. Book3S 64 only supports 64K
  26         # and 4K page sizes.
  27         default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
  28         default 33 if PPC_BOOK3S_64                  # 33 = 45 (32T) - 12 (4K)
  29         #
  30         # On all other 64-bit platforms (currently only Book3E), the virtual
  31         # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
  32         # of address space (2^44). Only 4K page sizes are supported.
  33         default 32 if 64BIT     # 32 = 44 (16T) - 12 (4K)
  34         #
  35         # For 32-bit, use the compat values, as they're the same.
  36         default ARCH_MMAP_RND_COMPAT_BITS_MAX
  37
  38 config ARCH_MMAP_RND_BITS_MIN
  39         # Allow randomisation to consume up to 1GB of address space (2^30).
  40         default 14 if 64BIT && PPC_64K_PAGES    # 14 = 30 (1GB) - 16 (64K)
  41         default 18 if 64BIT                     # 18 = 30 (1GB) - 12 (4K)
  42         #
  43         # For 32-bit, use the compat values, as they're the same.
  44         default ARCH_MMAP_RND_COMPAT_BITS_MIN
  45
  46 config ARCH_MMAP_RND_COMPAT_BITS_MAX
  47         # Total virtual address space for 32-bit processes is 2^31 (2GB).
  48         # Allow randomisation to consume up to 512MB of address space (2^29).
  49         default 11 if PPC_256K_PAGES    # 11 = 29 (512MB) - 18 (256K)
  50         default 13 if PPC_64K_PAGES     # 13 = 29 (512MB) - 16 (64K)
  51         default 15 if PPC_16K_PAGES     # 15 = 29 (512MB) - 14 (16K)
  52         default 17                      # 17 = 29 (512MB) - 12 (4K)
  53
  54 config ARCH_MMAP_RND_COMPAT_BITS_MIN
  55         # Total virtual address space for 32-bit processes is 2^31 (2GB).
  56         # Allow randomisation to consume up to 8MB of address space (2^23).
  57         default 5 if PPC_256K_PAGES     #  5 = 23 (8MB) - 18 (256K)
  58         default 7 if PPC_64K_PAGES      #  7 = 23 (8MB) - 16 (64K)
  59         default 9 if PPC_16K_PAGES      #  9 = 23 (8MB) - 14 (16K)
  60         default 11                      # 11 = 23 (8MB) - 12 (4K)
  61
  62 config HAVE_SETUP_PER_CPU_AREA
  63         def_bool PPC64
  64
  65 config NEED_PER_CPU_EMBED_FIRST_CHUNK
  66         def_bool PPC64
  67
  68 config NR_IRQS
  69         int "Number of virtual interrupt numbers"
  70         range 32 32768
  71         default "512"
  72         help
  73           This defines the number of virtual interrupt numbers the kernel
  74           can manage. Virtual interrupt numbers are what you see in
  75           /proc/interrupts. If you configure your system to have too few,
  76           drivers will fail to load or worse - handle with care.
  77
  78 config NMI_IPI
  79         bool
  80         depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
  81         default y
  82
  83 config PPC_WATCHDOG
  84         bool
  85         depends on HARDLOCKUP_DETECTOR
  86         depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
  87         default y
  88         help
  89           This is a placeholder when the powerpc hardlockup detector
  90           watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
  91           seleted via the generic lockup detector menu which is why we
  92           have no standalone config option for it here.
  93
  94 config STACKTRACE_SUPPORT
  95         bool
  96         default y
  97
  98 config TRACE_IRQFLAGS_SUPPORT
  99         bool
 100         default y
 101
 102 config LOCKDEP_SUPPORT
 103         bool
 104         default y
 105
 106 config RWSEM_GENERIC_SPINLOCK
 107         bool
 108
 109 config RWSEM_XCHGADD_ALGORITHM
 110         bool
 111         default y
 112
 113 config GENERIC_LOCKBREAK
 114         bool
 115         default y
 116         depends on SMP && PREEMPT
 117
 118 config GENERIC_HWEIGHT
 119         bool
 120         default y
 121
 122 config ARCH_HAS_DMA_SET_COHERENT_MASK
 123         bool
 124
 125 config PPC
 126         bool
 127         default y
 128         #
 129         # Please keep this list sorted alphabetically.
 130         #
 131         select ARCH_HAS_DEVMEM_IS_ALLOWED
 132         select ARCH_HAS_DMA_SET_COHERENT_MASK
 133         select ARCH_HAS_ELF_RANDOMIZE
 134         select ARCH_HAS_FORTIFY_SOURCE
 135         select ARCH_HAS_GCOV_PROFILE_ALL
 136         select ARCH_HAS_PHYS_TO_DMA
 137         select ARCH_HAS_PMEM_API                if PPC64
 138         select ARCH_HAS_PTE_SPECIAL
 139         select ARCH_HAS_MEMBARRIER_CALLBACKS
 140         select ARCH_HAS_SCALED_CPUTIME          if VIRT_CPU_ACCOUNTING_NATIVE && PPC64
 141         select ARCH_HAS_SG_CHAIN
 142         select ARCH_HAS_STRICT_KERNEL_RWX       if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION)
 143         select ARCH_HAS_TICK_BROADCAST          if GENERIC_CLOCKEVENTS_BROADCAST
 144         select ARCH_HAS_UACCESS_FLUSHCACHE      if PPC64
 145         select ARCH_HAS_UBSAN_SANITIZE_ALL
 146         select ARCH_HAS_ZONE_DEVICE             if PPC_BOOK3S_64
 147         select ARCH_HAVE_NMI_SAFE_CMPXCHG
 148         select ARCH_MIGHT_HAVE_PC_PARPORT
 149         select ARCH_MIGHT_HAVE_PC_SERIO
 150         select ARCH_OPTIONAL_KERNEL_RWX         if ARCH_HAS_STRICT_KERNEL_RWX
 151         select ARCH_SUPPORTS_ATOMIC_RMW
 152         select ARCH_USE_BUILTIN_BSWAP
 153         select ARCH_USE_CMPXCHG_LOCKREF         if PPC64
 154         select ARCH_WANT_IPC_PARSE_VERSION
 155         select ARCH_WEAK_RELEASE_ACQUIRE
 156         select BINFMT_ELF
 157         select BUILDTIME_EXTABLE_SORT
 158         select CLONE_BACKWARDS
 159         select DCACHE_WORD_ACCESS               if PPC64 && CPU_LITTLE_ENDIAN
 160         select DYNAMIC_FTRACE                   if FUNCTION_TRACER
 161         select EDAC_ATOMIC_SCRUB
 162         select EDAC_SUPPORT
 163         select GENERIC_ATOMIC64                 if PPC32
 164         select GENERIC_CLOCKEVENTS
 165         select GENERIC_CLOCKEVENTS_BROADCAST    if SMP
 166         select GENERIC_CMOS_UPDATE
 167         select GENERIC_CPU_AUTOPROBE
 168         select GENERIC_CPU_VULNERABILITIES      if PPC_BARRIER_NOSPEC
 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 HAVE_CBPF_JIT                    if !PPC64
 183         select HAVE_STACKPROTECTOR              if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
 184         select HAVE_STACKPROTECTOR              if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
 185         select HAVE_CONTEXT_TRACKING            if PPC64
 186         select HAVE_DEBUG_KMEMLEAK
 187         select HAVE_DEBUG_STACKOVERFLOW
 188         select HAVE_DYNAMIC_FTRACE
 189         select HAVE_DYNAMIC_FTRACE_WITH_REGS    if MPROFILE_KERNEL
 190         select HAVE_EBPF_JIT                    if PPC64
 191         select HAVE_EFFICIENT_UNALIGNED_ACCESS  if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
 192         select HAVE_FTRACE_MCOUNT_RECORD
 193         select HAVE_FUNCTION_ERROR_INJECTION
 194         select HAVE_FUNCTION_GRAPH_TRACER
 195         select HAVE_FUNCTION_TRACER
 196         select HAVE_GCC_PLUGINS                 if GCC_VERSION >= 50200   # plugin support on gcc <= 5.1 is buggy on PPC
 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_KERNEL_XZ                   if PPC_BOOK3S
 204         select HAVE_KPROBES
 205         select HAVE_KPROBES_ON_FTRACE
 206         select HAVE_KRETPROBES
 207         select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
 208         select HAVE_LIVEPATCH                   if HAVE_DYNAMIC_FTRACE_WITH_REGS
 209         select HAVE_MEMBLOCK
 210         select HAVE_MEMBLOCK_NODE_MAP
 211         select HAVE_MOD_ARCH_SPECIFIC
 212         select HAVE_NMI                         if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
 213         select HAVE_HARDLOCKUP_DETECTOR_ARCH    if (PPC64 && PPC_BOOK3S)
 214         select HAVE_OPROFILE
 215         select HAVE_OPTPROBES                   if PPC64
 216         select HAVE_PERF_EVENTS
 217         select HAVE_PERF_EVENTS_NMI             if PPC64
 218         select HAVE_HARDLOCKUP_DETECTOR_PERF    if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
 219         select HAVE_PERF_REGS
 220         select HAVE_PERF_USER_STACK_DUMP
 221         select HAVE_RCU_TABLE_FREE              if SMP
 222         select HAVE_REGS_AND_STACK_ACCESS_API
 223         select HAVE_RELIABLE_STACKTRACE         if PPC64 && CPU_LITTLE_ENDIAN
 224         select HAVE_SYSCALL_TRACEPOINTS
 225         select HAVE_VIRT_CPU_ACCOUNTING
 226         select HAVE_IRQ_TIME_ACCOUNTING
 227         select HAVE_RSEQ
 228         select IOMMU_HELPER                     if PPC64
 229         select IRQ_DOMAIN
 230         select IRQ_FORCED_THREADING
 231         select MODULES_USE_ELF_RELA
 232         select NEED_DMA_MAP_STATE               if PPC64 || NOT_COHERENT_CACHE
 233         select NEED_SG_DMA_LENGTH
 234         select NO_BOOTMEM
 235         select OF
 236         select OF_EARLY_FLATTREE
 237         select OF_RESERVED_MEM
 238         select OLD_SIGACTION                    if PPC32
 239         select OLD_SIGSUSPEND
 240         select RTC_LIB
 241         select SPARSE_IRQ
 242         select SYSCTL_EXCEPTION_TRACE
 243         select VIRT_TO_BUS                      if !PPC64
 244         #
 245         # Please keep this list sorted alphabetically.
 246         #
 247
 248 config PPC_BARRIER_NOSPEC
 249     bool
 250     default y
 251     depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
 252
 253 config GENERIC_CSUM
 254         def_bool n
 255
 256 config EARLY_PRINTK
 257         bool
 258         default y
 259
 260 config PANIC_TIMEOUT
 261         int
 262         default 180
 263
 264 config COMPAT
 265         bool
 266         default y if PPC64
 267         select COMPAT_BINFMT_ELF
 268         select ARCH_WANT_OLD_COMPAT_IPC
 269         select COMPAT_OLD_SIGACTION
 270
 271 config SYSVIPC_COMPAT
 272         bool
 273         depends on COMPAT && SYSVIPC
 274         default y
 275
 276 # All PPC32s use generic nvram driver through ppc_md
 277 config GENERIC_NVRAM
 278         bool
 279         default y if PPC32
 280
 281 config SCHED_OMIT_FRAME_POINTER
 282         bool
 283         default y
 284
 285 config ARCH_MAY_HAVE_PC_FDC
 286         bool
 287         default PCI
 288
 289 config PPC_UDBG_16550
 290         bool
 291
 292 config GENERIC_TBSYNC
 293         bool
 294         default y if PPC32 && SMP
 295
 296 config AUDIT_ARCH
 297         bool
 298         default y
 299
 300 config GENERIC_BUG
 301         bool
 302         default y
 303         depends on BUG
 304
 305 config SYS_SUPPORTS_APM_EMULATION
 306         default y if PMAC_APM_EMU
 307         bool
 308
 309 config EPAPR_BOOT
 310         bool
 311         help
 312           Used to allow a board to specify it wants an ePAPR compliant wrapper.
 313
 314 config DEFAULT_UIMAGE
 315         bool
 316         help
 317           Used to allow a board to specify it wants a uImage built by default
 318
 319 config ARCH_HIBERNATION_POSSIBLE
 320         bool
 321         default y
 322
 323 config ARCH_SUSPEND_POSSIBLE
 324         def_bool y
 325         depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
 326                    (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
 327                    || 44x || 40x
 328
 329 config PPC_DCR_NATIVE
 330         bool
 331
 332 config PPC_DCR_MMIO
 333         bool
 334
 335 config PPC_DCR
 336         bool
 337         depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
 338         default y
 339
 340 config PPC_OF_PLATFORM_PCI
 341         bool
 342         depends on PCI
 343         depends on PPC64 # not supported on 32 bits yet
 344
 345 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
 346         depends on PPC32 || PPC_BOOK3S_64
 347         def_bool y
 348
 349 config ARCH_SUPPORTS_UPROBES
 350         def_bool y
 351
 352 config PPC_ADV_DEBUG_REGS
 353         bool
 354         depends on 40x || BOOKE
 355         default y
 356
 357 config PPC_ADV_DEBUG_IACS
 358         int
 359         depends on PPC_ADV_DEBUG_REGS
 360         default 4 if 44x
 361         default 2
 362
 363 config PPC_ADV_DEBUG_DACS
 364         int
 365         depends on PPC_ADV_DEBUG_REGS
 366         default 2
 367
 368 config PPC_ADV_DEBUG_DVCS
 369         int
 370         depends on PPC_ADV_DEBUG_REGS
 371         default 2 if 44x
 372         default 0
 373
 374 config PPC_ADV_DEBUG_DAC_RANGE
 375         bool
 376         depends on PPC_ADV_DEBUG_REGS && 44x
 377         default y
 378
 379 config ZONE_DMA32
 380         bool
 381         default y if PPC64
 382
 383 config PGTABLE_LEVELS
 384         int
 385         default 2 if !PPC64
 386         default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
 387         default 4
 388
 389 source "arch/powerpc/sysdev/Kconfig"
 390 source "arch/powerpc/platforms/Kconfig"
 391
 392 menu "Kernel options"
 393
 394 config HIGHMEM
 395         bool "High memory support"
 396         depends on PPC32
 397
 398 source kernel/Kconfig.hz
 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        ---help---
 447          Support user-mode Transactional Memory on POWERPC.
 448
 449 config LD_HEAD_STUB_CATCH
 450         bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
 451         depends on PPC64
 452         help
 453           Very large kernels can cause linker branch stubs to be generated by
 454           code in head_64.S, which moves the head text sections out of their
 455           specified location. This option can work around the problem.
 456
 457           If unsure, say "N".
 458
 459 config MPROFILE_KERNEL
 460         depends on PPC64 && CPU_LITTLE_ENDIAN
 461         def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
 462
 463 config HOTPLUG_CPU
 464         bool "Support for enabling/disabling CPUs"
 465         depends on SMP && (PPC_PSERIES || \
 466         PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
 467         ---help---
 468           Say Y here to be able to disable and re-enable individual
 469           CPUs at runtime on SMP machines.
 470
 471           Say N if you are unsure.
 472
 473 config ARCH_CPU_PROBE_RELEASE
 474         def_bool y
 475         depends on HOTPLUG_CPU
 476
 477 config ARCH_ENABLE_MEMORY_HOTPLUG
 478         def_bool y
 479
 480 config ARCH_HAS_WALK_MEMORY
 481         def_bool y
 482
 483 config ARCH_ENABLE_MEMORY_HOTREMOVE
 484         def_bool y
 485
 486 config PPC64_SUPPORTS_MEMORY_FAILURE
 487         bool "Add support for memory hwpoison"
 488         depends on PPC_BOOK3S_64
 489         default "y" if PPC_POWERNV
 490         select ARCH_SUPPORTS_MEMORY_FAILURE
 491
 492 config KEXEC
 493         bool "kexec system call"
 494         depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
 495         select KEXEC_CORE
 496         help
 497           kexec is a system call that implements the ability to shutdown your
 498           current kernel, and to start another kernel.  It is like a reboot
 499           but it is independent of the system firmware.   And like a reboot
 500           you can start any kernel with it, not just Linux.
 501
 502           The name comes from the similarity to the exec system call.
 503
 504           It is an ongoing process to be certain the hardware in a machine
 505           is properly shutdown, so do not be surprised if this code does not
 506           initially work for you.  As of this writing the exact hardware
 507           interface is strongly in flux, so no good recommendation can be
 508           made.
 509
 510 config KEXEC_FILE
 511         bool "kexec file based system call"
 512         select KEXEC_CORE
 513         select HAVE_IMA_KEXEC
 514         select BUILD_BIN2C
 515         depends on PPC64
 516         depends on CRYPTO=y
 517         depends on CRYPTO_SHA256=y
 518         help
 519           This is a new version of the kexec system call. This call is
 520           file based and takes in file descriptors as system call arguments
 521           for kernel and initramfs as opposed to a list of segments as is the
 522           case for the older kexec call.
 523
 524 config ARCH_HAS_KEXEC_PURGATORY
 525         def_bool KEXEC_FILE
 526
 527 config RELOCATABLE
 528         bool "Build a relocatable kernel"
 529         depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
 530         select NONSTATIC_KERNEL
 531         select MODULE_REL_CRCS if MODVERSIONS
 532         help
 533           This builds a kernel image that is capable of running at the
 534           location the kernel is loaded at. For ppc32, there is no any
 535           alignment restrictions, and this feature is a superset of
 536           DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
 537           16k-aligned base address. The kernel is linked as a
 538           position-independent executable (PIE) and contains dynamic relocations
 539           which are processed early in the bootup process.
 540
 541           One use is for the kexec on panic case where the recovery kernel
 542           must live at a different physical address than the primary
 543           kernel.
 544
 545           Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
 546           it has been loaded at and the compile time physical addresses
 547           CONFIG_PHYSICAL_START is ignored.  However CONFIG_PHYSICAL_START
 548           setting can still be useful to bootwrappers that need to know the
 549           load address of the kernel (eg. u-boot/mkimage).
 550
 551 config RELOCATABLE_TEST
 552         bool "Test relocatable kernel"
 553         depends on (PPC64 && RELOCATABLE)
 554         help
 555           This runs the relocatable kernel at the address it was initially
 556           loaded at, which tends to be non-zero and therefore test the
 557           relocation code.
 558
 559 config CRASH_DUMP
 560         bool "Build a dump capture kernel"
 561         depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
 562         select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
 563         help
 564           Build a kernel suitable for use as a dump capture kernel.
 565           The same kernel binary can be used as production kernel and dump
 566           capture kernel.
 567
 568 config FA_DUMP
 569         bool "Firmware-assisted dump"
 570         depends on PPC64 && PPC_RTAS
 571         select CRASH_CORE
 572         select CRASH_DUMP
 573         help
 574           A robust mechanism to get reliable kernel crash dump with
 575           assistance from firmware. This approach does not use kexec,
 576           instead firmware assists in booting the capture kernel
 577           while preserving memory contents. Firmware-assisted dump
 578           is meant to be a kdump replacement offering robustness and
 579           speed not possible without system firmware assistance.
 580
 581           If unsure, say "N"
 582
 583 config IRQ_ALL_CPUS
 584         bool "Distribute interrupts on all CPUs by default"
 585         depends on SMP
 586         help
 587           This option gives the kernel permission to distribute IRQs across
 588           multiple CPUs.  Saying N here will route all IRQs to the first
 589           CPU.  Generally saying Y is safe, although some problems have been
 590           reported with SMP Power Macintoshes with this option enabled.
 591
 592 config NUMA
 593         bool "NUMA support"
 594         depends on PPC64
 595         default y if SMP && PPC_PSERIES
 596
 597 config NODES_SHIFT
 598         int
 599         default "8" if PPC64
 600         default "4"
 601         depends on NEED_MULTIPLE_NODES
 602
 603 config USE_PERCPU_NUMA_NODE_ID
 604         def_bool y
 605         depends on NUMA
 606
 607 config HAVE_MEMORYLESS_NODES
 608         def_bool y
 609         depends on NUMA
 610
 611 config ARCH_SELECT_MEMORY_MODEL
 612         def_bool y
 613         depends on PPC64
 614
 615 config ARCH_FLATMEM_ENABLE
 616         def_bool y
 617         depends on (PPC64 && !NUMA) || PPC32
 618
 619 config ARCH_SPARSEMEM_ENABLE
 620         def_bool y
 621         depends on PPC64
 622         select SPARSEMEM_VMEMMAP_ENABLE
 623
 624 config ARCH_SPARSEMEM_DEFAULT
 625         def_bool y
 626         depends on PPC_BOOK3S_64
 627
 628 config SYS_SUPPORTS_HUGETLBFS
 629         bool
 630
 631 config ILLEGAL_POINTER_VALUE
 632         hex
 633         # This is roughly half way between the top of user space and the bottom
 634         # of kernel space, which seems about as good as we can get.
 635         default 0x5deadbeef0000000 if PPC64
 636         default 0
 637
 638 config ARCH_MEMORY_PROBE
 639         def_bool y
 640         depends on MEMORY_HOTPLUG
 641
 642 # Some NUMA nodes have memory ranges that span
 643 # other nodes.  Even though a pfn is valid and
 644 # between a node's start and end pfns, it may not
 645 # reside on that node.  See memmap_init_zone()
 646 # for details.
 647 config NODES_SPAN_OTHER_NODES
 648         def_bool y
 649         depends on NEED_MULTIPLE_NODES
 650
 651 config STDBINUTILS
 652         bool "Using standard binutils settings"
 653         depends on 44x
 654         default y
 655         help
 656           Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
 657           Note, that kernel will be able to run only those applications,
 658           which had been compiled using binutils later than 2.17.50.0.3 with
 659           '-zmax-page-size' set to 256K (the default is 64K). Or, if using
 660           the older binutils, you can patch them with a trivial patch, which
 661           changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
 662
 663 choice
 664         prompt "Page size"
 665         default PPC_4K_PAGES
 666         help
 667           Select the kernel logical page size. Increasing the page size
 668           will reduce software overhead at each page boundary, allow
 669           hardware prefetch mechanisms to be more effective, and allow
 670           larger dma transfers increasing IO efficiency and reducing
 671           overhead. However the utilization of memory will increase.
 672           For example, each cached file will using a multiple of the
 673           page size to hold its contents and the difference between the
 674           end of file and the end of page is wasted.
 675
 676           Some dedicated systems, such as software raid serving with
 677           accelerated calculations, have shown significant increases.
 678
 679           If you configure a 64 bit kernel for 64k pages but the
 680           processor does not support them, then the kernel will simulate
 681           them with 4k pages, loading them on demand, but with the
 682           reduced software overhead and larger internal fragmentation.
 683           For the 32 bit kernel, a large page option will not be offered
 684           unless it is supported by the configured processor.
 685
 686           If unsure, choose 4K_PAGES.
 687
 688 config PPC_4K_PAGES
 689         bool "4k page size"
 690         select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
 691
 692 config PPC_16K_PAGES
 693         bool "16k page size"
 694         depends on 44x || PPC_8xx
 695
 696 config PPC_64K_PAGES
 697         bool "64k page size"
 698         depends on !PPC_FSL_BOOK3E && (44x || PPC_BOOK3S_64 || PPC_BOOK3E_64)
 699         select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
 700
 701 config PPC_256K_PAGES
 702         bool "256k page size"
 703         depends on 44x && !STDBINUTILS
 704         help
 705           Make the page size 256k.
 706
 707           As the ELF standard only requires alignment to support page
 708           sizes up to 64k, you will need to compile all of your user
 709           space applications with a non-standard binutils settings
 710           (see the STDBINUTILS description for details).
 711
 712           Say N unless you know what you are doing.
 713
 714 endchoice
 715
 716 config THREAD_SHIFT
 717         int "Thread shift" if EXPERT
 718         range 13 15
 719         default "15" if PPC_256K_PAGES
 720         default "14" if PPC64
 721         default "13"
 722         help
 723           Used to define the stack size. The default is almost always what you
 724           want. Only change this if you know what you are doing.
 725
 726 config FORCE_MAX_ZONEORDER
 727         int "Maximum zone order"
 728         range 8 9 if PPC64 && PPC_64K_PAGES
 729         default "9" if PPC64 && PPC_64K_PAGES
 730         range 13 13 if PPC64 && !PPC_64K_PAGES
 731         default "13" if PPC64 && !PPC_64K_PAGES
 732         range 9 64 if PPC32 && PPC_16K_PAGES
 733         default "9" if PPC32 && PPC_16K_PAGES
 734         range 7 64 if PPC32 && PPC_64K_PAGES
 735         default "7" if PPC32 && PPC_64K_PAGES
 736         range 5 64 if PPC32 && PPC_256K_PAGES
 737         default "5" if PPC32 && PPC_256K_PAGES
 738         range 11 64
 739         default "11"
 740         help
 741           The kernel memory allocator divides physically contiguous memory
 742           blocks into "zones", where each zone is a power of two number of
 743           pages.  This option selects the largest power of two that the kernel
 744           keeps in the memory allocator.  If you need to allocate very large
 745           blocks of physically contiguous memory, then you may need to
 746           increase this value.
 747
 748           This config option is actually maximum order plus one. For example,
 749           a value of 11 means that the largest free memory block is 2^10 pages.
 750
 751           The page size is not necessarily 4KB.  For example, on 64-bit
 752           systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES.  Keep
 753           this in mind when choosing a value for this option.
 754
 755 config PPC_SUBPAGE_PROT
 756         bool "Support setting protections for 4k subpages"
 757         depends on PPC_BOOK3S_64 && PPC_64K_PAGES
 758         help
 759           This option adds support for a system call to allow user programs
 760           to set access permissions (read/write, readonly, or no access)
 761           on the 4k subpages of each 64k page.
 762
 763 config PPC_COPRO_BASE
 764         bool
 765
 766 config SCHED_SMT
 767         bool "SMT (Hyperthreading) scheduler support"
 768         depends on PPC64 && SMP
 769         help
 770           SMT scheduler support improves the CPU scheduler's decision making
 771           when dealing with POWER5 cpus at a cost of slightly increased
 772           overhead in some places. If unsure say N here.
 773
 774 config PPC_DENORMALISATION
 775         bool "PowerPC denormalisation exception handling"
 776         depends on PPC_BOOK3S_64
 777         default "y" if PPC_POWERNV
 778         ---help---
 779           Add support for handling denormalisation of single precision
 780           values.  Useful for bare metal only.  If unsure say Y here.
 781
 782 config CMDLINE_BOOL
 783         bool "Default bootloader kernel arguments"
 784
 785 config CMDLINE
 786         string "Initial kernel command string"
 787         depends on CMDLINE_BOOL
 788         default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
 789         help
 790           On some platforms, there is currently no way for the boot loader to
 791           pass arguments to the kernel. For these platforms, you can supply
 792           some command-line options at build time by entering them here.  In
 793           most cases you will need to specify the root device here.
 794
 795 config CMDLINE_FORCE
 796         bool "Always use the default kernel command string"
 797         depends on CMDLINE_BOOL
 798         help
 799           Always use the default kernel command string, even if the boot
 800           loader passes other arguments to the kernel.
 801           This is useful if you cannot or don't want to change the
 802           command-line options your boot loader passes to the kernel.
 803
 804 config EXTRA_TARGETS
 805         string "Additional default image types"
 806         help
 807           List additional targets to be built by the bootwrapper here (separated
 808           by spaces).  This is useful for targets that depend of device tree
 809           files in the .dts directory.
 810
 811           Targets in this list will be build as part of the default build
 812           target, or when the user does a 'make zImage' or a
 813           'make zImage.initrd'.
 814
 815           If unsure, leave blank
 816
 817 config ARCH_WANTS_FREEZER_CONTROL
 818         def_bool y
 819         depends on ADB_PMU
 820
 821 source kernel/power/Kconfig
 822
 823 config SECCOMP
 824         bool "Enable seccomp to safely compute untrusted bytecode"
 825         depends on PROC_FS
 826         default y
 827         help
 828           This kernel feature is useful for number crunching applications
 829           that may need to compute untrusted bytecode during their
 830           execution. By using pipes or other transports made available to
 831           the process as file descriptors supporting the read/write
 832           syscalls, it's possible to isolate those applications in
 833           their own address space using seccomp. Once seccomp is
 834           enabled via /proc/<pid>/seccomp, it cannot be disabled
 835           and the task is only allowed to execute a few safe syscalls
 836           defined by each seccomp mode.
 837
 838           If unsure, say Y. Only embedded should say N here.
 839
 840 config PPC_MEM_KEYS
 841         prompt "PowerPC Memory Protection Keys"
 842         def_bool y
 843         depends on PPC_BOOK3S_64
 844         select ARCH_USES_HIGH_VMA_FLAGS
 845         select ARCH_HAS_PKEYS
 846         help
 847           Memory Protection Keys provides a mechanism for enforcing
 848           page-based protections, but without requiring modification of the
 849           page tables when an application changes protection domains.
 850
 851           For details, see Documentation/vm/protection-keys.rst
 852
 853           If unsure, say y.
 854
 855 endmenu
 856
 857 config ISA_DMA_API
 858         bool
 859         default PCI
 860
 861 menu "Bus options"
 862
 863 config ISA
 864         bool "Support for ISA-bus hardware"
 865         depends on PPC_CHRP
 866         select PPC_I8259
 867         help
 868           Find out whether you have ISA slots on your motherboard.  ISA is the
 869           name of a bus system, i.e. the way the CPU talks to the other stuff
 870           inside your box.  If you have an Apple machine, say N here; if you
 871           have an IBM RS/6000 or pSeries machine, say Y.  If you have an
 872           embedded board, consult your board documentation.
 873
 874 config ZONE_DMA
 875         bool
 876         default y
 877
 878 config GENERIC_ISA_DMA
 879         bool
 880         depends on ISA_DMA_API
 881         default y
 882
 883 config PPC_INDIRECT_PCI
 884         bool
 885         depends on PCI
 886         default y if 40x || 44x
 887
 888 config EISA
 889         bool
 890
 891 config SBUS
 892         bool
 893
 894 config FSL_SOC
 895         bool
 896
 897 config FSL_PCI
 898         bool
 899         select PPC_INDIRECT_PCI
 900         select PCI_QUIRKS
 901
 902 config FSL_PMC
 903         bool
 904         default y
 905         depends on SUSPEND && (PPC_85xx || PPC_86xx)
 906         help
 907           Freescale MPC85xx/MPC86xx power management controller support
 908           (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
 909
 910 config PPC4xx_CPM
 911         bool
 912         default y
 913         depends on SUSPEND && (44x || 40x)
 914         help
 915           PPC4xx Clock Power Management (CPM) support (suspend/resume).
 916           It also enables support for two different idle states (idle-wait
 917           and idle-doze).
 918
 919 config 4xx_SOC
 920         bool
 921
 922 config FSL_LBC
 923         bool "Freescale Local Bus support"
 924         help
 925           Enables reporting of errors from the Freescale local bus
 926           controller.  Also contains some common code used by
 927           drivers for specific local bus peripherals.
 928
 929 config FSL_GTM
 930         bool
 931         depends on PPC_83xx || QUICC_ENGINE || CPM2
 932         help
 933           Freescale General-purpose Timers support
 934
 935 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
 936 config MCA
 937         bool
 938
 939 # Platforms that what PCI turned unconditionally just do select PCI
 940 # in their config node.  Platforms that want to choose at config
 941 # time should select PPC_PCI_CHOICE
 942 config PPC_PCI_CHOICE
 943         bool
 944
 945 config PCI
 946         bool "PCI support" if PPC_PCI_CHOICE
 947         default y if !40x && !CPM2 && !PPC_8xx && !PPC_83xx \
 948                 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
 949         default PCI_QSPAN if PPC_8xx
 950         select GENERIC_PCI_IOMAP
 951         help
 952           Find out whether your system includes a PCI bus. PCI is the name of
 953           a bus system, i.e. the way the CPU talks to the other stuff inside
 954           your box.  If you say Y here, the kernel will include drivers and
 955           infrastructure code to support PCI bus devices.
 956
 957 config PCI_DOMAINS
 958         def_bool PCI
 959
 960 config PCI_SYSCALL
 961         def_bool PCI
 962
 963 config PCI_QSPAN
 964         bool "QSpan PCI"
 965         depends on PPC_8xx
 966         select PPC_I8259
 967         help
 968           Say Y here if you have a system based on a Motorola 8xx-series
 969           embedded processor with a QSPAN PCI interface, otherwise say N.
 970
 971 config PCI_8260
 972         bool
 973         depends on PCI && 8260
 974         select PPC_INDIRECT_PCI
 975         default y
 976
 977 source "drivers/pci/Kconfig"
 978
 979 source "drivers/pcmcia/Kconfig"
 980
 981 config HAS_RAPIDIO
 982         bool
 983
 984 config RAPIDIO
 985         tristate "RapidIO support"
 986         depends on HAS_RAPIDIO || PCI
 987         help
 988           If you say Y here, the kernel will include drivers and
 989           infrastructure code to support RapidIO interconnect devices.
 990
 991 config FSL_RIO
 992         bool "Freescale Embedded SRIO Controller support"
 993         depends on RAPIDIO = y && HAS_RAPIDIO
 994         default "n"
 995         ---help---
 996           Include support for RapidIO controller on Freescale embedded
 997           processors (MPC8548, MPC8641, etc).
 998
 999 source "drivers/rapidio/Kconfig"
1000
1001 endmenu
1002
1003 config NONSTATIC_KERNEL
1004         bool
1005
1006 menu "Advanced setup"
1007         depends on PPC32
1008
1009 config ADVANCED_OPTIONS
1010         bool "Prompt for advanced kernel configuration options"
1011         help
1012           This option will enable prompting for a variety of advanced kernel
1013           configuration options.  These options can cause the kernel to not
1014           work if they are set incorrectly, but can be used to optimize certain
1015           aspects of kernel memory management.
1016
1017           Unless you know what you are doing, say N here.
1018
1019 comment "Default settings for advanced configuration options are used"
1020         depends on !ADVANCED_OPTIONS
1021
1022 config LOWMEM_SIZE_BOOL
1023         bool "Set maximum low memory"
1024         depends on ADVANCED_OPTIONS
1025         help
1026           This option allows you to set the maximum amount of memory which
1027           will be used as "low memory", that is, memory which the kernel can
1028           access directly, without having to set up a kernel virtual mapping.
1029           This can be useful in optimizing the layout of kernel virtual
1030           memory.
1031
1032           Say N here unless you know what you are doing.
1033
1034 config LOWMEM_SIZE
1035         hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1036         default "0x30000000"
1037
1038 config LOWMEM_CAM_NUM_BOOL
1039         bool "Set number of CAMs to use to map low memory"
1040         depends on ADVANCED_OPTIONS && FSL_BOOKE
1041         help
1042           This option allows you to set the maximum number of CAM slots that
1043           will be used to map low memory.  There are a limited number of slots
1044           available and even more limited number that will fit in the L1 MMU.
1045           However, using more entries will allow mapping more low memory.  This
1046           can be useful in optimizing the layout of kernel virtual memory.
1047
1048           Say N here unless you know what you are doing.
1049
1050 config LOWMEM_CAM_NUM
1051         depends on FSL_BOOKE
1052         int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1053         default 3
1054
1055 config DYNAMIC_MEMSTART
1056         bool "Enable page aligned dynamic load address for kernel"
1057         depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1058         select NONSTATIC_KERNEL
1059         help
1060           This option enables the kernel to be loaded at any page aligned
1061           physical address. The kernel creates a mapping from KERNELBASE to
1062           the address where the kernel is loaded. The page size here implies
1063           the TLB page size of the mapping for kernel on the particular platform.
1064           Please refer to the init code for finding the TLB page size.
1065
1066           DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1067           kernel image, where the only restriction is the page aligned kernel
1068           load address. When this option is enabled, the compile time physical
1069           address CONFIG_PHYSICAL_START is ignored.
1070
1071           This option is overridden by CONFIG_RELOCATABLE
1072
1073 config PAGE_OFFSET_BOOL
1074         bool "Set custom page offset address"
1075         depends on ADVANCED_OPTIONS
1076         help
1077           This option allows you to set the kernel virtual address at which
1078           the kernel will map low memory.  This can be useful in optimizing
1079           the virtual memory layout of the system.
1080
1081           Say N here unless you know what you are doing.
1082
1083 config PAGE_OFFSET
1084         hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1085         default "0xc0000000"
1086
1087 config KERNEL_START_BOOL
1088         bool "Set custom kernel base address"
1089         depends on ADVANCED_OPTIONS
1090         help
1091           This option allows you to set the kernel virtual address at which
1092           the kernel will be loaded.  Normally this should match PAGE_OFFSET
1093           however there are times (like kdump) that one might not want them
1094           to be the same.
1095
1096           Say N here unless you know what you are doing.
1097
1098 config KERNEL_START
1099         hex "Virtual address of kernel base" if KERNEL_START_BOOL
1100         default PAGE_OFFSET if PAGE_OFFSET_BOOL
1101         default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1102         default "0xc0000000"
1103
1104 config PHYSICAL_START_BOOL
1105         bool "Set physical address where the kernel is loaded"
1106         depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1107         help
1108           This gives the physical address where the kernel is loaded.
1109
1110           Say N here unless you know what you are doing.
1111
1112 config PHYSICAL_START
1113         hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1114         default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1115         default "0x00000000"
1116
1117 config PHYSICAL_ALIGN
1118         hex
1119         default "0x04000000" if FSL_BOOKE
1120         help
1121           This value puts the alignment restrictions on physical address
1122           where kernel is loaded and run from. Kernel is compiled for an
1123           address which meets above alignment restriction.
1124
1125 config TASK_SIZE_BOOL
1126         bool "Set custom user task size"
1127         depends on ADVANCED_OPTIONS
1128         help
1129           This option allows you to set the amount of virtual address space
1130           allocated to user tasks.  This can be useful in optimizing the
1131           virtual memory layout of the system.
1132
1133           Say N here unless you know what you are doing.
1134
1135 config TASK_SIZE
1136         hex "Size of user task space" if TASK_SIZE_BOOL
1137         default "0x80000000" if PPC_8xx
1138         default "0xc0000000"
1139
1140 config CONSISTENT_SIZE_BOOL
1141         bool "Set custom consistent memory pool size"
1142         depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1143         help
1144           This option allows you to set the size of the
1145           consistent memory pool.  This pool of virtual memory
1146           is used to make consistent memory allocations.
1147
1148 config CONSISTENT_SIZE
1149         hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1150         default "0x00200000" if NOT_COHERENT_CACHE
1151
1152 config PIN_TLB
1153         bool "Pinned Kernel TLBs (860 ONLY)"
1154         depends on ADVANCED_OPTIONS && PPC_8xx && \
1155                    !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1156
1157 config PIN_TLB_DATA
1158         bool "Pinned TLB for DATA"
1159         depends on PIN_TLB
1160         default y
1161
1162 config PIN_TLB_IMMR
1163         bool "Pinned TLB for IMMR"
1164         depends on PIN_TLB
1165         default y
1166
1167 config PIN_TLB_TEXT
1168         bool "Pinned TLB for TEXT"
1169         depends on PIN_TLB
1170         default y
1171 endmenu
1172
1173 if PPC64
1174 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1175 config PAGE_OFFSET
1176         hex
1177         default "0xc000000000000000"
1178 config KERNEL_START
1179         hex
1180         default "0xc000000000000000"
1181 config PHYSICAL_START
1182         hex
1183         default "0x00000000"
1184 endif
1185
1186 config  ARCH_RANDOM
1187         def_bool n
1188
1189 config PPC_LIB_RHEAP
1190         bool
1191
1192 source "arch/powerpc/kvm/Kconfig"
1193
1194 source "kernel/livepatch/Kconfig"