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 ARCH_PHYS_ADDR_T_64BIT 16 def_bool PPC64 || PHYS_64BIT 17 18config ARCH_DMA_ADDR_T_64BIT 19 def_bool ARCH_PHYS_ADDR_T_64BIT 20 21config MMU 22 bool 23 default y 24 25config HAVE_SETUP_PER_CPU_AREA 26 def_bool PPC64 27 28config NEED_PER_CPU_EMBED_FIRST_CHUNK 29 def_bool PPC64 30 31config 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 41config STACKTRACE_SUPPORT 42 bool 43 default y 44 45config TRACE_IRQFLAGS_SUPPORT 46 bool 47 default y 48 49config LOCKDEP_SUPPORT 50 bool 51 default y 52 53config RWSEM_GENERIC_SPINLOCK 54 bool 55 56config RWSEM_XCHGADD_ALGORITHM 57 bool 58 default y 59 60config GENERIC_LOCKBREAK 61 bool 62 default y 63 depends on SMP && PREEMPT 64 65config ARCH_HAS_ILOG2_U32 66 bool 67 default y 68 69config ARCH_HAS_ILOG2_U64 70 bool 71 default y if 64BIT 72 73config GENERIC_HWEIGHT 74 bool 75 default y 76 77config ARCH_HAS_DMA_SET_COHERENT_MASK 78 bool 79 80config PPC 81 bool 82 default y 83 select BUILDTIME_EXTABLE_SORT 84 select ARCH_MIGHT_HAVE_PC_PARPORT 85 select ARCH_MIGHT_HAVE_PC_SERIO 86 select BINFMT_ELF 87 select ARCH_HAS_ELF_RANDOMIZE 88 select OF 89 select OF_EARLY_FLATTREE 90 select OF_RESERVED_MEM 91 select HAVE_FTRACE_MCOUNT_RECORD 92 select HAVE_DYNAMIC_FTRACE 93 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL 94 select HAVE_FUNCTION_TRACER 95 select HAVE_FUNCTION_GRAPH_TRACER 96 select SYSCTL_EXCEPTION_TRACE 97 select VIRT_TO_BUS if !PPC64 98 select HAVE_IDE 99 select HAVE_IOREMAP_PROT 100 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU) 101 select HAVE_KPROBES 102 select HAVE_ARCH_KGDB 103 select HAVE_KRETPROBES 104 select HAVE_ARCH_TRACEHOOK 105 select HAVE_MEMBLOCK 106 select HAVE_MEMBLOCK_NODE_MAP 107 select HAVE_DMA_API_DEBUG 108 select HAVE_OPROFILE 109 select HAVE_DEBUG_KMEMLEAK 110 select ARCH_HAS_SG_CHAIN 111 select GENERIC_ATOMIC64 if PPC32 112 select HAVE_PERF_EVENTS 113 select HAVE_PERF_REGS 114 select HAVE_PERF_USER_STACK_DUMP 115 select HAVE_REGS_AND_STACK_ACCESS_API 116 select HAVE_HW_BREAKPOINT if PERF_EVENTS && PPC_BOOK3S_64 117 select ARCH_WANT_IPC_PARSE_VERSION 118 select SPARSE_IRQ 119 select IRQ_DOMAIN 120 select GENERIC_IRQ_SHOW 121 select GENERIC_IRQ_SHOW_LEVEL 122 select IRQ_FORCED_THREADING 123 select HAVE_RCU_TABLE_FREE if SMP 124 select HAVE_SYSCALL_TRACEPOINTS 125 select HAVE_CBPF_JIT if !PPC64 126 select HAVE_EBPF_JIT if PPC64 127 select HAVE_ARCH_JUMP_LABEL 128 select ARCH_HAVE_NMI_SAFE_CMPXCHG 129 select ARCH_HAS_GCOV_PROFILE_ALL 130 select GENERIC_SMP_IDLE_THREAD 131 select GENERIC_CMOS_UPDATE 132 select GENERIC_TIME_VSYSCALL_OLD 133 select GENERIC_CLOCKEVENTS 134 select GENERIC_CLOCKEVENTS_BROADCAST if SMP 135 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 136 select GENERIC_STRNCPY_FROM_USER 137 select GENERIC_STRNLEN_USER 138 select HAVE_MOD_ARCH_SPECIFIC 139 select MODULES_USE_ELF_RELA 140 select CLONE_BACKWARDS 141 select ARCH_USE_BUILTIN_BSWAP 142 select OLD_SIGSUSPEND 143 select OLD_SIGACTION if PPC32 144 select HAVE_DEBUG_STACKOVERFLOW 145 select HAVE_IRQ_EXIT_ON_IRQ_STACK 146 select ARCH_USE_CMPXCHG_LOCKREF if PPC64 147 select HAVE_ARCH_AUDITSYSCALL 148 select ARCH_SUPPORTS_ATOMIC_RMW 149 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN 150 select NO_BOOTMEM 151 select HAVE_GENERIC_RCU_GUP 152 select HAVE_PERF_EVENTS_NMI if PPC64 153 select HAVE_NMI if PERF_EVENTS 154 select EDAC_SUPPORT 155 select EDAC_ATOMIC_SCRUB 156 select ARCH_HAS_DMA_SET_COHERENT_MASK 157 select ARCH_HAS_DEVMEM_IS_ALLOWED 158 select HAVE_ARCH_SECCOMP_FILTER 159 select ARCH_HAS_UBSAN_SANITIZE_ALL 160 select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT 161 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS 162 select GENERIC_CPU_AUTOPROBE 163 select HAVE_VIRT_CPU_ACCOUNTING 164 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE 165 select HAVE_ARCH_HARDENED_USERCOPY 166 select HAVE_KERNEL_GZIP 167 168config GENERIC_CSUM 169 def_bool CPU_LITTLE_ENDIAN 170 171config EARLY_PRINTK 172 bool 173 default y 174 175config PANIC_TIMEOUT 176 int 177 default 180 178 179config COMPAT 180 bool 181 default y if PPC64 182 select COMPAT_BINFMT_ELF 183 select ARCH_WANT_OLD_COMPAT_IPC 184 select COMPAT_OLD_SIGACTION 185 186config SYSVIPC_COMPAT 187 bool 188 depends on COMPAT && SYSVIPC 189 default y 190 191# All PPC32s use generic nvram driver through ppc_md 192config GENERIC_NVRAM 193 bool 194 default y if PPC32 195 196config SCHED_OMIT_FRAME_POINTER 197 bool 198 default y 199 200config ARCH_MAY_HAVE_PC_FDC 201 bool 202 default PCI 203 204config PPC_UDBG_16550 205 bool 206 default n 207 208config GENERIC_TBSYNC 209 bool 210 default y if PPC32 && SMP 211 default n 212 213config AUDIT_ARCH 214 bool 215 default y 216 217config GENERIC_BUG 218 bool 219 default y 220 depends on BUG 221 222config SYS_SUPPORTS_APM_EMULATION 223 default y if PMAC_APM_EMU 224 bool 225 226config EPAPR_BOOT 227 bool 228 help 229 Used to allow a board to specify it wants an ePAPR compliant wrapper. 230 default n 231 232config DEFAULT_UIMAGE 233 bool 234 help 235 Used to allow a board to specify it wants a uImage built by default 236 default n 237 238config ARCH_HIBERNATION_POSSIBLE 239 bool 240 default y 241 242config ARCH_SUSPEND_POSSIBLE 243 def_bool y 244 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \ 245 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \ 246 || 44x || 40x 247 248config PPC_DCR_NATIVE 249 bool 250 default n 251 252config PPC_DCR_MMIO 253 bool 254 default n 255 256config PPC_DCR 257 bool 258 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO 259 default y 260 261config PPC_OF_PLATFORM_PCI 262 bool 263 depends on PCI 264 depends on PPC64 # not supported on 32 bits yet 265 default n 266 267config ARCH_SUPPORTS_DEBUG_PAGEALLOC 268 depends on PPC32 || PPC_STD_MMU_64 269 def_bool y 270 271config ARCH_SUPPORTS_UPROBES 272 def_bool y 273 274config PPC_ADV_DEBUG_REGS 275 bool 276 depends on 40x || BOOKE 277 default y 278 279config PPC_ADV_DEBUG_IACS 280 int 281 depends on PPC_ADV_DEBUG_REGS 282 default 4 if 44x 283 default 2 284 285config PPC_ADV_DEBUG_DACS 286 int 287 depends on PPC_ADV_DEBUG_REGS 288 default 2 289 290config PPC_ADV_DEBUG_DVCS 291 int 292 depends on PPC_ADV_DEBUG_REGS 293 default 2 if 44x 294 default 0 295 296config PPC_ADV_DEBUG_DAC_RANGE 297 bool 298 depends on PPC_ADV_DEBUG_REGS && 44x 299 default y 300 301config PPC_EMULATE_SSTEP 302 bool 303 default y if KPROBES || UPROBES || XMON || HAVE_HW_BREAKPOINT 304 305config ZONE_DMA32 306 bool 307 default y if PPC64 308 309config PGTABLE_LEVELS 310 int 311 default 2 if !PPC64 312 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64 313 default 4 314 315source "init/Kconfig" 316 317source "kernel/Kconfig.freezer" 318 319source "arch/powerpc/sysdev/Kconfig" 320source "arch/powerpc/platforms/Kconfig" 321 322menu "Kernel options" 323 324config HIGHMEM 325 bool "High memory support" 326 depends on PPC32 327 328source kernel/Kconfig.hz 329source kernel/Kconfig.preempt 330source "fs/Kconfig.binfmt" 331 332config HUGETLB_PAGE_SIZE_VARIABLE 333 bool 334 depends on HUGETLB_PAGE 335 default y 336 337config MATH_EMULATION 338 bool "Math emulation" 339 depends on 4xx || 8xx || PPC_MPC832x || BOOKE 340 ---help--- 341 Some PowerPC chips designed for embedded applications do not have 342 a floating-point unit and therefore do not implement the 343 floating-point instructions in the PowerPC instruction set. If you 344 say Y here, the kernel will include code to emulate a floating-point 345 unit, which will allow programs that use floating-point 346 instructions to run. 347 348 This is also useful to emulate missing (optional) instructions 349 such as fsqrt on cores that do have an FPU but do not implement 350 them (such as Freescale BookE). 351 352choice 353 prompt "Math emulation options" 354 default MATH_EMULATION_FULL 355 depends on MATH_EMULATION 356 357config MATH_EMULATION_FULL 358 bool "Emulate all the floating point instructions" 359 ---help--- 360 Select this option will enable the kernel to support to emulate 361 all the floating point instructions. If your SoC doesn't have 362 a FPU, you should select this. 363 364config MATH_EMULATION_HW_UNIMPLEMENTED 365 bool "Just emulate the FPU unimplemented instructions" 366 ---help--- 367 Select this if you know there does have a hardware FPU on your 368 SoC, but some floating point instructions are not implemented by that. 369 370endchoice 371 372config PPC_TRANSACTIONAL_MEM 373 bool "Transactional Memory support for POWERPC" 374 depends on PPC_BOOK3S_64 375 depends on SMP 376 select ALTIVEC 377 select VSX 378 default n 379 ---help--- 380 Support user-mode Transactional Memory on POWERPC. 381 382config DISABLE_MPROFILE_KERNEL 383 bool "Disable use of mprofile-kernel for kernel tracing" 384 depends on PPC64 && CPU_LITTLE_ENDIAN 385 default y 386 help 387 Selecting this options disables use of the mprofile-kernel ABI for 388 kernel tracing. That will cause options such as live patching 389 (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to 390 be disabled also. 391 392 If you have a toolchain which supports mprofile-kernel, then you can 393 enable this. Otherwise leave it disabled. If you're not sure, say 394 "N". 395 396config MPROFILE_KERNEL 397 depends on PPC64 && CPU_LITTLE_ENDIAN 398 def_bool !DISABLE_MPROFILE_KERNEL 399 400config USE_THIN_ARCHIVES 401 bool "Build the kernel using thin archives" 402 default n 403 select THIN_ARCHIVES 404 help 405 Build the kernel using thin archives. 406 If you're unsure say N. 407 408config IOMMU_HELPER 409 def_bool PPC64 410 411config SWIOTLB 412 bool "SWIOTLB support" 413 default n 414 select IOMMU_HELPER 415 ---help--- 416 Support for IO bounce buffering for systems without an IOMMU. 417 This allows us to DMA to the full physical address space on 418 platforms where the size of a physical address is larger 419 than the bus address. Not all platforms support this. 420 421config HOTPLUG_CPU 422 bool "Support for enabling/disabling CPUs" 423 depends on SMP && (PPC_PSERIES || \ 424 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE) 425 ---help--- 426 Say Y here to be able to disable and re-enable individual 427 CPUs at runtime on SMP machines. 428 429 Say N if you are unsure. 430 431config ARCH_CPU_PROBE_RELEASE 432 def_bool y 433 depends on HOTPLUG_CPU 434 435config ARCH_ENABLE_MEMORY_HOTPLUG 436 def_bool y 437 438config ARCH_HAS_WALK_MEMORY 439 def_bool y 440 441config ARCH_ENABLE_MEMORY_HOTREMOVE 442 def_bool y 443 444config PPC64_SUPPORTS_MEMORY_FAILURE 445 bool "Add support for memory hwpoison" 446 depends on PPC_BOOK3S_64 447 default "y" if PPC_POWERNV 448 select ARCH_SUPPORTS_MEMORY_FAILURE 449 450config KEXEC 451 bool "kexec system call" 452 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E 453 select KEXEC_CORE 454 help 455 kexec is a system call that implements the ability to shutdown your 456 current kernel, and to start another kernel. It is like a reboot 457 but it is independent of the system firmware. And like a reboot 458 you can start any kernel with it, not just Linux. 459 460 The name comes from the similarity to the exec system call. 461 462 It is an ongoing process to be certain the hardware in a machine 463 is properly shutdown, so do not be surprised if this code does not 464 initially work for you. As of this writing the exact hardware 465 interface is strongly in flux, so no good recommendation can be 466 made. 467 468config KEXEC_FILE 469 bool "kexec file based system call" 470 select KEXEC_CORE 471 select HAVE_IMA_KEXEC 472 select BUILD_BIN2C 473 depends on PPC64 474 depends on CRYPTO=y 475 depends on CRYPTO_SHA256=y 476 help 477 This is a new version of the kexec system call. This call is 478 file based and takes in file descriptors as system call arguments 479 for kernel and initramfs as opposed to a list of segments as is the 480 case for the older kexec call. 481 482config RELOCATABLE 483 bool "Build a relocatable kernel" 484 depends on (PPC64 && !COMPILE_TEST) || (FLATMEM && (44x || FSL_BOOKE)) 485 select NONSTATIC_KERNEL 486 select MODULE_REL_CRCS if MODVERSIONS 487 help 488 This builds a kernel image that is capable of running at the 489 location the kernel is loaded at. For ppc32, there is no any 490 alignment restrictions, and this feature is a superset of 491 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use 492 16k-aligned base address. The kernel is linked as a 493 position-independent executable (PIE) and contains dynamic relocations 494 which are processed early in the bootup process. 495 496 One use is for the kexec on panic case where the recovery kernel 497 must live at a different physical address than the primary 498 kernel. 499 500 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address 501 it has been loaded at and the compile time physical addresses 502 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START 503 setting can still be useful to bootwrappers that need to know the 504 load address of the kernel (eg. u-boot/mkimage). 505 506config RELOCATABLE_TEST 507 bool "Test relocatable kernel" 508 depends on (PPC64 && RELOCATABLE) 509 default n 510 help 511 This runs the relocatable kernel at the address it was initially 512 loaded at, which tends to be non-zero and therefore test the 513 relocation code. 514 515config CRASH_DUMP 516 bool "Build a kdump crash kernel" 517 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP) 518 select RELOCATABLE if (PPC64 && !COMPILE_TEST) || 44x || FSL_BOOKE 519 help 520 Build a kernel suitable for use as a kdump capture kernel. 521 The same kernel binary can be used as production kernel and dump 522 capture kernel. 523 524config FA_DUMP 525 bool "Firmware-assisted dump" 526 depends on PPC64 && PPC_RTAS && CRASH_DUMP && KEXEC_CORE 527 help 528 A robust mechanism to get reliable kernel crash dump with 529 assistance from firmware. This approach does not use kexec, 530 instead firmware assists in booting the kdump kernel 531 while preserving memory contents. Firmware-assisted dump 532 is meant to be a kdump replacement offering robustness and 533 speed not possible without system firmware assistance. 534 535 If unsure, say "N" 536 537config IRQ_ALL_CPUS 538 bool "Distribute interrupts on all CPUs by default" 539 depends on SMP 540 help 541 This option gives the kernel permission to distribute IRQs across 542 multiple CPUs. Saying N here will route all IRQs to the first 543 CPU. Generally saying Y is safe, although some problems have been 544 reported with SMP Power Macintoshes with this option enabled. 545 546config NUMA 547 bool "NUMA support" 548 depends on PPC64 549 default y if SMP && PPC_PSERIES 550 551config NODES_SHIFT 552 int 553 default "8" if PPC64 554 default "4" 555 depends on NEED_MULTIPLE_NODES 556 557config USE_PERCPU_NUMA_NODE_ID 558 def_bool y 559 depends on NUMA 560 561config HAVE_MEMORYLESS_NODES 562 def_bool y 563 depends on NUMA 564 565config ARCH_SELECT_MEMORY_MODEL 566 def_bool y 567 depends on PPC64 568 569config ARCH_FLATMEM_ENABLE 570 def_bool y 571 depends on (PPC64 && !NUMA) || PPC32 572 573config ARCH_SPARSEMEM_ENABLE 574 def_bool y 575 depends on PPC64 576 select SPARSEMEM_VMEMMAP_ENABLE 577 578config ARCH_SPARSEMEM_DEFAULT 579 def_bool y 580 depends on (SMP && PPC_PSERIES) || PPC_PS3 581 582config SYS_SUPPORTS_HUGETLBFS 583 bool 584 585config ILLEGAL_POINTER_VALUE 586 hex 587 # This is roughly half way between the top of user space and the bottom 588 # of kernel space, which seems about as good as we can get. 589 default 0x5deadbeef0000000 if PPC64 590 default 0 591 592source "mm/Kconfig" 593 594config ARCH_MEMORY_PROBE 595 def_bool y 596 depends on MEMORY_HOTPLUG 597 598# Some NUMA nodes have memory ranges that span 599# other nodes. Even though a pfn is valid and 600# between a node's start and end pfns, it may not 601# reside on that node. See memmap_init_zone() 602# for details. 603config NODES_SPAN_OTHER_NODES 604 def_bool y 605 depends on NEED_MULTIPLE_NODES 606 607config STDBINUTILS 608 bool "Using standard binutils settings" 609 depends on 44x 610 default y 611 help 612 Turning this option off allows you to select 256KB PAGE_SIZE on 44x. 613 Note, that kernel will be able to run only those applications, 614 which had been compiled using binutils later than 2.17.50.0.3 with 615 '-zmax-page-size' set to 256K (the default is 64K). Or, if using 616 the older binutils, you can patch them with a trivial patch, which 617 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000. 618 619choice 620 prompt "Page size" 621 default PPC_4K_PAGES 622 help 623 Select the kernel logical page size. Increasing the page size 624 will reduce software overhead at each page boundary, allow 625 hardware prefetch mechanisms to be more effective, and allow 626 larger dma transfers increasing IO efficiency and reducing 627 overhead. However the utilization of memory will increase. 628 For example, each cached file will using a multiple of the 629 page size to hold its contents and the difference between the 630 end of file and the end of page is wasted. 631 632 Some dedicated systems, such as software raid serving with 633 accelerated calculations, have shown significant increases. 634 635 If you configure a 64 bit kernel for 64k pages but the 636 processor does not support them, then the kernel will simulate 637 them with 4k pages, loading them on demand, but with the 638 reduced software overhead and larger internal fragmentation. 639 For the 32 bit kernel, a large page option will not be offered 640 unless it is supported by the configured processor. 641 642 If unsure, choose 4K_PAGES. 643 644config PPC_4K_PAGES 645 bool "4k page size" 646 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 647 648config PPC_16K_PAGES 649 bool "16k page size" 650 depends on 44x || PPC_8xx 651 652config PPC_64K_PAGES 653 bool "64k page size" 654 depends on !PPC_FSL_BOOK3E && (44x || PPC_STD_MMU_64 || PPC_BOOK3E_64) 655 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 656 657config PPC_256K_PAGES 658 bool "256k page size" 659 depends on 44x && !STDBINUTILS 660 help 661 Make the page size 256k. 662 663 As the ELF standard only requires alignment to support page 664 sizes up to 64k, you will need to compile all of your user 665 space applications with a non-standard binutils settings 666 (see the STDBINUTILS description for details). 667 668 Say N unless you know what you are doing. 669 670endchoice 671 672config FORCE_MAX_ZONEORDER 673 int "Maximum zone order" 674 range 8 9 if PPC64 && PPC_64K_PAGES 675 default "9" if PPC64 && PPC_64K_PAGES 676 range 13 13 if PPC64 && !PPC_64K_PAGES 677 default "13" if PPC64 && !PPC_64K_PAGES 678 range 9 64 if PPC32 && PPC_16K_PAGES 679 default "9" if PPC32 && PPC_16K_PAGES 680 range 7 64 if PPC32 && PPC_64K_PAGES 681 default "7" if PPC32 && PPC_64K_PAGES 682 range 5 64 if PPC32 && PPC_256K_PAGES 683 default "5" if PPC32 && PPC_256K_PAGES 684 range 11 64 685 default "11" 686 help 687 The kernel memory allocator divides physically contiguous memory 688 blocks into "zones", where each zone is a power of two number of 689 pages. This option selects the largest power of two that the kernel 690 keeps in the memory allocator. If you need to allocate very large 691 blocks of physically contiguous memory, then you may need to 692 increase this value. 693 694 This config option is actually maximum order plus one. For example, 695 a value of 11 means that the largest free memory block is 2^10 pages. 696 697 The page size is not necessarily 4KB. For example, on 64-bit 698 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep 699 this in mind when choosing a value for this option. 700 701config PPC_SUBPAGE_PROT 702 bool "Support setting protections for 4k subpages" 703 depends on PPC_STD_MMU_64 && PPC_64K_PAGES 704 help 705 This option adds support for a system call to allow user programs 706 to set access permissions (read/write, readonly, or no access) 707 on the 4k subpages of each 64k page. 708 709config PPC_COPRO_BASE 710 bool 711 default n 712 713config SCHED_SMT 714 bool "SMT (Hyperthreading) scheduler support" 715 depends on PPC64 && SMP 716 help 717 SMT scheduler support improves the CPU scheduler's decision making 718 when dealing with POWER5 cpus at a cost of slightly increased 719 overhead in some places. If unsure say N here. 720 721config PPC_DENORMALISATION 722 bool "PowerPC denormalisation exception handling" 723 depends on PPC_BOOK3S_64 724 default "y" if PPC_POWERNV 725 ---help--- 726 Add support for handling denormalisation of single precision 727 values. Useful for bare metal only. If unsure say Y here. 728 729config CMDLINE_BOOL 730 bool "Default bootloader kernel arguments" 731 732config CMDLINE 733 string "Initial kernel command string" 734 depends on CMDLINE_BOOL 735 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" 736 help 737 On some platforms, there is currently no way for the boot loader to 738 pass arguments to the kernel. For these platforms, you can supply 739 some command-line options at build time by entering them here. In 740 most cases you will need to specify the root device here. 741 742config CMDLINE_FORCE 743 bool "Always use the default kernel command string" 744 depends on CMDLINE_BOOL 745 help 746 Always use the default kernel command string, even if the boot 747 loader passes other arguments to the kernel. 748 This is useful if you cannot or don't want to change the 749 command-line options your boot loader passes to the kernel. 750 751config EXTRA_TARGETS 752 string "Additional default image types" 753 help 754 List additional targets to be built by the bootwrapper here (separated 755 by spaces). This is useful for targets that depend of device tree 756 files in the .dts directory. 757 758 Targets in this list will be build as part of the default build 759 target, or when the user does a 'make zImage' or a 760 'make zImage.initrd'. 761 762 If unsure, leave blank 763 764config ARCH_WANTS_FREEZER_CONTROL 765 def_bool y 766 depends on ADB_PMU 767 768source kernel/power/Kconfig 769 770config SECCOMP 771 bool "Enable seccomp to safely compute untrusted bytecode" 772 depends on PROC_FS 773 default y 774 help 775 This kernel feature is useful for number crunching applications 776 that may need to compute untrusted bytecode during their 777 execution. By using pipes or other transports made available to 778 the process as file descriptors supporting the read/write 779 syscalls, it's possible to isolate those applications in 780 their own address space using seccomp. Once seccomp is 781 enabled via /proc/<pid>/seccomp, it cannot be disabled 782 and the task is only allowed to execute a few safe syscalls 783 defined by each seccomp mode. 784 785 If unsure, say Y. Only embedded should say N here. 786 787endmenu 788 789config ISA_DMA_API 790 bool 791 default PCI 792 793menu "Bus options" 794 795config ISA 796 bool "Support for ISA-bus hardware" 797 depends on PPC_CHRP 798 select PPC_I8259 799 help 800 Find out whether you have ISA slots on your motherboard. ISA is the 801 name of a bus system, i.e. the way the CPU talks to the other stuff 802 inside your box. If you have an Apple machine, say N here; if you 803 have an IBM RS/6000 or pSeries machine, say Y. If you have an 804 embedded board, consult your board documentation. 805 806config ZONE_DMA 807 bool 808 default y 809 810config NEED_DMA_MAP_STATE 811 def_bool (PPC64 || NOT_COHERENT_CACHE) 812 813config NEED_SG_DMA_LENGTH 814 def_bool y 815 816config GENERIC_ISA_DMA 817 bool 818 depends on ISA_DMA_API 819 default y 820 821config PPC_INDIRECT_PCI 822 bool 823 depends on PCI 824 default y if 40x || 44x 825 default n 826 827config EISA 828 bool 829 830config SBUS 831 bool 832 833config FSL_SOC 834 bool 835 836config FSL_PCI 837 bool 838 select PPC_INDIRECT_PCI 839 select PCI_QUIRKS 840 841config FSL_PMC 842 bool 843 default y 844 depends on SUSPEND && (PPC_85xx || PPC_86xx) 845 help 846 Freescale MPC85xx/MPC86xx power management controller support 847 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c 848 849config PPC4xx_CPM 850 bool 851 default y 852 depends on SUSPEND && (44x || 40x) 853 help 854 PPC4xx Clock Power Management (CPM) support (suspend/resume). 855 It also enables support for two different idle states (idle-wait 856 and idle-doze). 857 858config 4xx_SOC 859 bool 860 861config FSL_LBC 862 bool "Freescale Local Bus support" 863 help 864 Enables reporting of errors from the Freescale local bus 865 controller. Also contains some common code used by 866 drivers for specific local bus peripherals. 867 868config FSL_GTM 869 bool 870 depends on PPC_83xx || QUICC_ENGINE || CPM2 871 help 872 Freescale General-purpose Timers support 873 874# Yes MCA RS/6000s exist but Linux-PPC does not currently support any 875config MCA 876 bool 877 878# Platforms that what PCI turned unconditionally just do select PCI 879# in their config node. Platforms that want to choose at config 880# time should select PPC_PCI_CHOICE 881config PPC_PCI_CHOICE 882 bool 883 884config PCI 885 bool "PCI support" if PPC_PCI_CHOICE 886 default y if !40x && !CPM2 && !8xx && !PPC_83xx \ 887 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON 888 default PCI_QSPAN if !4xx && !CPM2 && 8xx 889 select GENERIC_PCI_IOMAP 890 help 891 Find out whether your system includes a PCI bus. PCI is the name of 892 a bus system, i.e. the way the CPU talks to the other stuff inside 893 your box. If you say Y here, the kernel will include drivers and 894 infrastructure code to support PCI bus devices. 895 896config PCI_DOMAINS 897 def_bool PCI 898 899config PCI_SYSCALL 900 def_bool PCI 901 902config PCI_QSPAN 903 bool "QSpan PCI" 904 depends on !4xx && !CPM2 && 8xx 905 select PPC_I8259 906 help 907 Say Y here if you have a system based on a Motorola 8xx-series 908 embedded processor with a QSPAN PCI interface, otherwise say N. 909 910config PCI_8260 911 bool 912 depends on PCI && 8260 913 select PPC_INDIRECT_PCI 914 default y 915 916source "drivers/pci/Kconfig" 917 918source "drivers/pcmcia/Kconfig" 919 920config HAS_RAPIDIO 921 bool 922 default n 923 924config RAPIDIO 925 tristate "RapidIO support" 926 depends on HAS_RAPIDIO || PCI 927 help 928 If you say Y here, the kernel will include drivers and 929 infrastructure code to support RapidIO interconnect devices. 930 931config FSL_RIO 932 bool "Freescale Embedded SRIO Controller support" 933 depends on RAPIDIO = y && HAS_RAPIDIO 934 default "n" 935 ---help--- 936 Include support for RapidIO controller on Freescale embedded 937 processors (MPC8548, MPC8641, etc). 938 939source "drivers/rapidio/Kconfig" 940 941endmenu 942 943config NONSTATIC_KERNEL 944 bool 945 default n 946 947menu "Advanced setup" 948 depends on PPC32 949 950config ADVANCED_OPTIONS 951 bool "Prompt for advanced kernel configuration options" 952 help 953 This option will enable prompting for a variety of advanced kernel 954 configuration options. These options can cause the kernel to not 955 work if they are set incorrectly, but can be used to optimize certain 956 aspects of kernel memory management. 957 958 Unless you know what you are doing, say N here. 959 960comment "Default settings for advanced configuration options are used" 961 depends on !ADVANCED_OPTIONS 962 963config LOWMEM_SIZE_BOOL 964 bool "Set maximum low memory" 965 depends on ADVANCED_OPTIONS 966 help 967 This option allows you to set the maximum amount of memory which 968 will be used as "low memory", that is, memory which the kernel can 969 access directly, without having to set up a kernel virtual mapping. 970 This can be useful in optimizing the layout of kernel virtual 971 memory. 972 973 Say N here unless you know what you are doing. 974 975config LOWMEM_SIZE 976 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL 977 default "0x30000000" 978 979config LOWMEM_CAM_NUM_BOOL 980 bool "Set number of CAMs to use to map low memory" 981 depends on ADVANCED_OPTIONS && FSL_BOOKE 982 help 983 This option allows you to set the maximum number of CAM slots that 984 will be used to map low memory. There are a limited number of slots 985 available and even more limited number that will fit in the L1 MMU. 986 However, using more entries will allow mapping more low memory. This 987 can be useful in optimizing the layout of kernel virtual memory. 988 989 Say N here unless you know what you are doing. 990 991config LOWMEM_CAM_NUM 992 depends on FSL_BOOKE 993 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL 994 default 3 995 996config DYNAMIC_MEMSTART 997 bool "Enable page aligned dynamic load address for kernel" 998 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x) 999 select NONSTATIC_KERNEL 1000 help 1001 This option enables the kernel to be loaded at any page aligned 1002 physical address. The kernel creates a mapping from KERNELBASE to 1003 the address where the kernel is loaded. The page size here implies 1004 the TLB page size of the mapping for kernel on the particular platform. 1005 Please refer to the init code for finding the TLB page size. 1006 1007 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE 1008 kernel image, where the only restriction is the page aligned kernel 1009 load address. When this option is enabled, the compile time physical 1010 address CONFIG_PHYSICAL_START is ignored. 1011 1012 This option is overridden by CONFIG_RELOCATABLE 1013 1014config PAGE_OFFSET_BOOL 1015 bool "Set custom page offset address" 1016 depends on ADVANCED_OPTIONS 1017 help 1018 This option allows you to set the kernel virtual address at which 1019 the kernel will map low memory. This can be useful in optimizing 1020 the virtual memory layout of the system. 1021 1022 Say N here unless you know what you are doing. 1023 1024config PAGE_OFFSET 1025 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL 1026 default "0xc0000000" 1027 1028config KERNEL_START_BOOL 1029 bool "Set custom kernel base address" 1030 depends on ADVANCED_OPTIONS 1031 help 1032 This option allows you to set the kernel virtual address at which 1033 the kernel will be loaded. Normally this should match PAGE_OFFSET 1034 however there are times (like kdump) that one might not want them 1035 to be the same. 1036 1037 Say N here unless you know what you are doing. 1038 1039config KERNEL_START 1040 hex "Virtual address of kernel base" if KERNEL_START_BOOL 1041 default PAGE_OFFSET if PAGE_OFFSET_BOOL 1042 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL 1043 default "0xc0000000" 1044 1045config PHYSICAL_START_BOOL 1046 bool "Set physical address where the kernel is loaded" 1047 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE 1048 help 1049 This gives the physical address where the kernel is loaded. 1050 1051 Say N here unless you know what you are doing. 1052 1053config PHYSICAL_START 1054 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL 1055 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL 1056 default "0x00000000" 1057 1058config PHYSICAL_ALIGN 1059 hex 1060 default "0x04000000" if FSL_BOOKE 1061 help 1062 This value puts the alignment restrictions on physical address 1063 where kernel is loaded and run from. Kernel is compiled for an 1064 address which meets above alignment restriction. 1065 1066config TASK_SIZE_BOOL 1067 bool "Set custom user task size" 1068 depends on ADVANCED_OPTIONS 1069 help 1070 This option allows you to set the amount of virtual address space 1071 allocated to user tasks. This can be useful in optimizing the 1072 virtual memory layout of the system. 1073 1074 Say N here unless you know what you are doing. 1075 1076config TASK_SIZE 1077 hex "Size of user task space" if TASK_SIZE_BOOL 1078 default "0x80000000" if PPC_8xx 1079 default "0xc0000000" 1080 1081config CONSISTENT_SIZE_BOOL 1082 bool "Set custom consistent memory pool size" 1083 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE 1084 help 1085 This option allows you to set the size of the 1086 consistent memory pool. This pool of virtual memory 1087 is used to make consistent memory allocations. 1088 1089config CONSISTENT_SIZE 1090 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL 1091 default "0x00200000" if NOT_COHERENT_CACHE 1092 1093config PIN_TLB 1094 bool "Pinned Kernel TLBs (860 ONLY)" 1095 depends on ADVANCED_OPTIONS && 8xx 1096 1097config PIN_TLB_IMMR 1098 bool "Pinned TLB for IMMR" 1099 depends on PIN_TLB 1100 default y 1101endmenu 1102 1103if PPC64 1104# This value must have zeroes in the bottom 60 bits otherwise lots will break 1105config PAGE_OFFSET 1106 hex 1107 default "0xc000000000000000" 1108config KERNEL_START 1109 hex 1110 default "0xc000000000000000" 1111config PHYSICAL_START 1112 hex 1113 default "0x00000000" 1114endif 1115 1116config ARCH_RANDOM 1117 def_bool n 1118 1119source "net/Kconfig" 1120 1121source "drivers/Kconfig" 1122 1123source "fs/Kconfig" 1124 1125source "lib/Kconfig" 1126 1127source "arch/powerpc/Kconfig.debug" 1128 1129source "security/Kconfig" 1130 1131config KEYS_COMPAT 1132 bool 1133 depends on COMPAT && KEYS 1134 default y 1135 1136source "crypto/Kconfig" 1137 1138config PPC_LIB_RHEAP 1139 bool 1140 1141source "arch/powerpc/kvm/Kconfig" 1142 1143source "kernel/livepatch/Kconfig" 1144