1# Select 32 or 64 bit 2config 64BIT 3 bool "64-bit kernel" if ARCH = "x86" 4 default ARCH != "i386" 5 ---help--- 6 Say yes to build a 64-bit kernel - formerly known as x86_64 7 Say no to build a 32-bit kernel - formerly known as i386 8 9config X86_32 10 def_bool y 11 depends on !64BIT 12 13config X86_64 14 def_bool y 15 depends on 64BIT 16 17### Arch settings 18config X86 19 def_bool y 20 select ACPI_LEGACY_TABLES_LOOKUP if ACPI 21 select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI 22 select ANON_INODES 23 select ARCH_CLOCKSOURCE_DATA 24 select ARCH_DISCARD_MEMBLOCK 25 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE 26 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS 27 select ARCH_HAS_DEVMEM_IS_ALLOWED 28 select ARCH_HAS_ELF_RANDOMIZE 29 select ARCH_HAS_FAST_MULTIPLIER 30 select ARCH_HAS_GCOV_PROFILE_ALL 31 select ARCH_HAS_KCOV if X86_64 32 select ARCH_HAS_PMEM_API if X86_64 33 select ARCH_HAS_MMIO_FLUSH 34 select ARCH_HAS_SG_CHAIN 35 select ARCH_HAS_UBSAN_SANITIZE_ALL 36 select ARCH_HAVE_NMI_SAFE_CMPXCHG 37 select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI 38 select ARCH_MIGHT_HAVE_PC_PARPORT 39 select ARCH_MIGHT_HAVE_PC_SERIO 40 select ARCH_SUPPORTS_ATOMIC_RMW 41 select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT 42 select ARCH_SUPPORTS_INT128 if X86_64 43 select ARCH_SUPPORTS_NUMA_BALANCING if X86_64 44 select ARCH_USE_BUILTIN_BSWAP 45 select ARCH_USE_CMPXCHG_LOCKREF if X86_64 46 select ARCH_USE_QUEUED_RWLOCKS 47 select ARCH_USE_QUEUED_SPINLOCKS 48 select ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH if SMP 49 select ARCH_WANTS_DYNAMIC_TASK_STRUCT 50 select ARCH_WANT_FRAME_POINTERS 51 select ARCH_WANT_IPC_PARSE_VERSION if X86_32 52 select ARCH_WANT_OPTIONAL_GPIOLIB 53 select BUILDTIME_EXTABLE_SORT 54 select CLKEVT_I8253 55 select CLKSRC_I8253 if X86_32 56 select CLOCKSOURCE_VALIDATE_LAST_CYCLE 57 select CLOCKSOURCE_WATCHDOG 58 select CLONE_BACKWARDS if X86_32 59 select COMPAT_OLD_SIGACTION if IA32_EMULATION 60 select DCACHE_WORD_ACCESS 61 select EDAC_ATOMIC_SCRUB 62 select EDAC_SUPPORT 63 select GENERIC_CLOCKEVENTS 64 select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC) 65 select GENERIC_CLOCKEVENTS_MIN_ADJUST 66 select GENERIC_CMOS_UPDATE 67 select GENERIC_CPU_AUTOPROBE 68 select GENERIC_EARLY_IOREMAP 69 select GENERIC_FIND_FIRST_BIT 70 select GENERIC_IOMAP 71 select GENERIC_IRQ_PROBE 72 select GENERIC_IRQ_SHOW 73 select GENERIC_PENDING_IRQ if SMP 74 select GENERIC_SMP_IDLE_THREAD 75 select GENERIC_STRNCPY_FROM_USER 76 select GENERIC_STRNLEN_USER 77 select GENERIC_TIME_VSYSCALL 78 select HAVE_ACPI_APEI if ACPI 79 select HAVE_ACPI_APEI_NMI if ACPI 80 select HAVE_ALIGNED_STRUCT_PAGE if SLUB 81 select HAVE_AOUT if X86_32 82 select HAVE_ARCH_AUDITSYSCALL 83 select HAVE_ARCH_HUGE_VMAP if X86_64 || X86_PAE 84 select HAVE_ARCH_JUMP_LABEL 85 select HAVE_ARCH_KASAN if X86_64 && SPARSEMEM_VMEMMAP 86 select HAVE_ARCH_KGDB 87 select HAVE_ARCH_KMEMCHECK 88 select HAVE_ARCH_MMAP_RND_BITS if MMU 89 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if MMU && COMPAT 90 select HAVE_ARCH_SECCOMP_FILTER 91 select HAVE_ARCH_SOFT_DIRTY if X86_64 92 select HAVE_ARCH_TRACEHOOK 93 select HAVE_ARCH_TRANSPARENT_HUGEPAGE 94 select HAVE_EBPF_JIT if X86_64 95 select HAVE_CC_STACKPROTECTOR 96 select HAVE_CMPXCHG_DOUBLE 97 select HAVE_CMPXCHG_LOCAL 98 select HAVE_CONTEXT_TRACKING if X86_64 99 select HAVE_COPY_THREAD_TLS 100 select HAVE_C_RECORDMCOUNT 101 select HAVE_DEBUG_KMEMLEAK 102 select HAVE_DEBUG_STACKOVERFLOW 103 select HAVE_DMA_API_DEBUG 104 select HAVE_DMA_CONTIGUOUS 105 select HAVE_DYNAMIC_FTRACE 106 select HAVE_DYNAMIC_FTRACE_WITH_REGS 107 select HAVE_EFFICIENT_UNALIGNED_ACCESS 108 select HAVE_EXIT_THREAD 109 select HAVE_FENTRY if X86_64 110 select HAVE_FTRACE_MCOUNT_RECORD 111 select HAVE_FUNCTION_GRAPH_FP_TEST 112 select HAVE_FUNCTION_GRAPH_TRACER 113 select HAVE_FUNCTION_TRACER 114 select HAVE_GENERIC_DMA_COHERENT if X86_32 115 select HAVE_HW_BREAKPOINT 116 select HAVE_IDE 117 select HAVE_IOREMAP_PROT 118 select HAVE_IRQ_EXIT_ON_IRQ_STACK if X86_64 119 select HAVE_IRQ_TIME_ACCOUNTING 120 select HAVE_KERNEL_BZIP2 121 select HAVE_KERNEL_GZIP 122 select HAVE_KERNEL_LZ4 123 select HAVE_KERNEL_LZMA 124 select HAVE_KERNEL_LZO 125 select HAVE_KERNEL_XZ 126 select HAVE_KPROBES 127 select HAVE_KPROBES_ON_FTRACE 128 select HAVE_KRETPROBES 129 select HAVE_KVM 130 select HAVE_LIVEPATCH if X86_64 131 select HAVE_MEMBLOCK 132 select HAVE_MEMBLOCK_NODE_MAP 133 select HAVE_MIXED_BREAKPOINTS_REGS 134 select HAVE_NMI 135 select HAVE_OPROFILE 136 select HAVE_OPTPROBES 137 select HAVE_PCSPKR_PLATFORM 138 select HAVE_PERF_EVENTS 139 select HAVE_PERF_EVENTS_NMI 140 select HAVE_PERF_REGS 141 select HAVE_PERF_USER_STACK_DUMP 142 select HAVE_REGS_AND_STACK_ACCESS_API 143 select HAVE_SYSCALL_TRACEPOINTS 144 select HAVE_UID16 if X86_32 || IA32_EMULATION 145 select HAVE_UNSTABLE_SCHED_CLOCK 146 select HAVE_USER_RETURN_NOTIFIER 147 select IRQ_FORCED_THREADING 148 select MODULES_USE_ELF_RELA if X86_64 149 select MODULES_USE_ELF_REL if X86_32 150 select OLD_SIGACTION if X86_32 151 select OLD_SIGSUSPEND3 if X86_32 || IA32_EMULATION 152 select PERF_EVENTS 153 select RTC_LIB 154 select SPARSE_IRQ 155 select SRCU 156 select SYSCTL_EXCEPTION_TRACE 157 select USER_STACKTRACE_SUPPORT 158 select VIRT_TO_BUS 159 select X86_DEV_DMA_OPS if X86_64 160 select X86_FEATURE_NAMES if PROC_FS 161 select HAVE_STACK_VALIDATION if X86_64 162 select ARCH_USES_HIGH_VMA_FLAGS if X86_INTEL_MEMORY_PROTECTION_KEYS 163 select ARCH_HAS_PKEYS if X86_INTEL_MEMORY_PROTECTION_KEYS 164 165config INSTRUCTION_DECODER 166 def_bool y 167 depends on KPROBES || PERF_EVENTS || UPROBES 168 169config OUTPUT_FORMAT 170 string 171 default "elf32-i386" if X86_32 172 default "elf64-x86-64" if X86_64 173 174config ARCH_DEFCONFIG 175 string 176 default "arch/x86/configs/i386_defconfig" if X86_32 177 default "arch/x86/configs/x86_64_defconfig" if X86_64 178 179config LOCKDEP_SUPPORT 180 def_bool y 181 182config STACKTRACE_SUPPORT 183 def_bool y 184 185config MMU 186 def_bool y 187 188config ARCH_MMAP_RND_BITS_MIN 189 default 28 if 64BIT 190 default 8 191 192config ARCH_MMAP_RND_BITS_MAX 193 default 32 if 64BIT 194 default 16 195 196config ARCH_MMAP_RND_COMPAT_BITS_MIN 197 default 8 198 199config ARCH_MMAP_RND_COMPAT_BITS_MAX 200 default 16 201 202config SBUS 203 bool 204 205config NEED_DMA_MAP_STATE 206 def_bool y 207 depends on X86_64 || INTEL_IOMMU || DMA_API_DEBUG || SWIOTLB 208 209config NEED_SG_DMA_LENGTH 210 def_bool y 211 212config GENERIC_ISA_DMA 213 def_bool y 214 depends on ISA_DMA_API 215 216config GENERIC_BUG 217 def_bool y 218 depends on BUG 219 select GENERIC_BUG_RELATIVE_POINTERS if X86_64 220 221config GENERIC_BUG_RELATIVE_POINTERS 222 bool 223 224config GENERIC_HWEIGHT 225 def_bool y 226 227config ARCH_MAY_HAVE_PC_FDC 228 def_bool y 229 depends on ISA_DMA_API 230 231config RWSEM_XCHGADD_ALGORITHM 232 def_bool y 233 234config GENERIC_CALIBRATE_DELAY 235 def_bool y 236 237config ARCH_HAS_CPU_RELAX 238 def_bool y 239 240config ARCH_HAS_CACHE_LINE_SIZE 241 def_bool y 242 243config HAVE_SETUP_PER_CPU_AREA 244 def_bool y 245 246config NEED_PER_CPU_EMBED_FIRST_CHUNK 247 def_bool y 248 249config NEED_PER_CPU_PAGE_FIRST_CHUNK 250 def_bool y 251 252config ARCH_HIBERNATION_POSSIBLE 253 def_bool y 254 255config ARCH_SUSPEND_POSSIBLE 256 def_bool y 257 258config ARCH_WANT_HUGE_PMD_SHARE 259 def_bool y 260 261config ARCH_WANT_GENERAL_HUGETLB 262 def_bool y 263 264config ZONE_DMA32 265 def_bool y if X86_64 266 267config AUDIT_ARCH 268 def_bool y if X86_64 269 270config ARCH_SUPPORTS_OPTIMIZED_INLINING 271 def_bool y 272 273config ARCH_SUPPORTS_DEBUG_PAGEALLOC 274 def_bool y 275 276config KASAN_SHADOW_OFFSET 277 hex 278 depends on KASAN 279 default 0xdffffc0000000000 280 281config HAVE_INTEL_TXT 282 def_bool y 283 depends on INTEL_IOMMU && ACPI 284 285config X86_32_SMP 286 def_bool y 287 depends on X86_32 && SMP 288 289config X86_64_SMP 290 def_bool y 291 depends on X86_64 && SMP 292 293config X86_32_LAZY_GS 294 def_bool y 295 depends on X86_32 && !CC_STACKPROTECTOR 296 297config ARCH_HWEIGHT_CFLAGS 298 string 299 default "-fcall-saved-ecx -fcall-saved-edx" if X86_32 300 default "-fcall-saved-rdi -fcall-saved-rsi -fcall-saved-rdx -fcall-saved-rcx -fcall-saved-r8 -fcall-saved-r9 -fcall-saved-r10 -fcall-saved-r11" if X86_64 301 302config ARCH_SUPPORTS_UPROBES 303 def_bool y 304 305config FIX_EARLYCON_MEM 306 def_bool y 307 308config DEBUG_RODATA 309 def_bool y 310 311config PGTABLE_LEVELS 312 int 313 default 4 if X86_64 314 default 3 if X86_PAE 315 default 2 316 317source "init/Kconfig" 318source "kernel/Kconfig.freezer" 319 320menu "Processor type and features" 321 322config ZONE_DMA 323 bool "DMA memory allocation support" if EXPERT 324 default y 325 help 326 DMA memory allocation support allows devices with less than 32-bit 327 addressing to allocate within the first 16MB of address space. 328 Disable if no such devices will be used. 329 330 If unsure, say Y. 331 332config SMP 333 bool "Symmetric multi-processing support" 334 ---help--- 335 This enables support for systems with more than one CPU. If you have 336 a system with only one CPU, say N. If you have a system with more 337 than one CPU, say Y. 338 339 If you say N here, the kernel will run on uni- and multiprocessor 340 machines, but will use only one CPU of a multiprocessor machine. If 341 you say Y here, the kernel will run on many, but not all, 342 uniprocessor machines. On a uniprocessor machine, the kernel 343 will run faster if you say N here. 344 345 Note that if you say Y here and choose architecture "586" or 346 "Pentium" under "Processor family", the kernel will not work on 486 347 architectures. Similarly, multiprocessor kernels for the "PPro" 348 architecture may not work on all Pentium based boards. 349 350 People using multiprocessor machines who say Y here should also say 351 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power 352 Management" code will be disabled if you say Y here. 353 354 See also <file:Documentation/x86/i386/IO-APIC.txt>, 355 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at 356 <http://www.tldp.org/docs.html#howto>. 357 358 If you don't know what to do here, say N. 359 360config X86_FEATURE_NAMES 361 bool "Processor feature human-readable names" if EMBEDDED 362 default y 363 ---help--- 364 This option compiles in a table of x86 feature bits and corresponding 365 names. This is required to support /proc/cpuinfo and a few kernel 366 messages. You can disable this to save space, at the expense of 367 making those few kernel messages show numeric feature bits instead. 368 369 If in doubt, say Y. 370 371config X86_FAST_FEATURE_TESTS 372 bool "Fast CPU feature tests" if EMBEDDED 373 default y 374 ---help--- 375 Some fast-paths in the kernel depend on the capabilities of the CPU. 376 Say Y here for the kernel to patch in the appropriate code at runtime 377 based on the capabilities of the CPU. The infrastructure for patching 378 code at runtime takes up some additional space; space-constrained 379 embedded systems may wish to say N here to produce smaller, slightly 380 slower code. 381 382config X86_X2APIC 383 bool "Support x2apic" 384 depends on X86_LOCAL_APIC && X86_64 && (IRQ_REMAP || HYPERVISOR_GUEST) 385 ---help--- 386 This enables x2apic support on CPUs that have this feature. 387 388 This allows 32-bit apic IDs (so it can support very large systems), 389 and accesses the local apic via MSRs not via mmio. 390 391 If you don't know what to do here, say N. 392 393config X86_MPPARSE 394 bool "Enable MPS table" if ACPI || SFI 395 default y 396 depends on X86_LOCAL_APIC 397 ---help--- 398 For old smp systems that do not have proper acpi support. Newer systems 399 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it 400 401config X86_BIGSMP 402 bool "Support for big SMP systems with more than 8 CPUs" 403 depends on X86_32 && SMP 404 ---help--- 405 This option is needed for the systems that have more than 8 CPUs 406 407config GOLDFISH 408 def_bool y 409 depends on X86_GOLDFISH 410 411if X86_32 412config X86_EXTENDED_PLATFORM 413 bool "Support for extended (non-PC) x86 platforms" 414 default y 415 ---help--- 416 If you disable this option then the kernel will only support 417 standard PC platforms. (which covers the vast majority of 418 systems out there.) 419 420 If you enable this option then you'll be able to select support 421 for the following (non-PC) 32 bit x86 platforms: 422 Goldfish (Android emulator) 423 AMD Elan 424 RDC R-321x SoC 425 SGI 320/540 (Visual Workstation) 426 STA2X11-based (e.g. Northville) 427 Moorestown MID devices 428 429 If you have one of these systems, or if you want to build a 430 generic distribution kernel, say Y here - otherwise say N. 431endif 432 433if X86_64 434config X86_EXTENDED_PLATFORM 435 bool "Support for extended (non-PC) x86 platforms" 436 default y 437 ---help--- 438 If you disable this option then the kernel will only support 439 standard PC platforms. (which covers the vast majority of 440 systems out there.) 441 442 If you enable this option then you'll be able to select support 443 for the following (non-PC) 64 bit x86 platforms: 444 Numascale NumaChip 445 ScaleMP vSMP 446 SGI Ultraviolet 447 448 If you have one of these systems, or if you want to build a 449 generic distribution kernel, say Y here - otherwise say N. 450endif 451# This is an alphabetically sorted list of 64 bit extended platforms 452# Please maintain the alphabetic order if and when there are additions 453config X86_NUMACHIP 454 bool "Numascale NumaChip" 455 depends on X86_64 456 depends on X86_EXTENDED_PLATFORM 457 depends on NUMA 458 depends on SMP 459 depends on X86_X2APIC 460 depends on PCI_MMCONFIG 461 ---help--- 462 Adds support for Numascale NumaChip large-SMP systems. Needed to 463 enable more than ~168 cores. 464 If you don't have one of these, you should say N here. 465 466config X86_VSMP 467 bool "ScaleMP vSMP" 468 select HYPERVISOR_GUEST 469 select PARAVIRT 470 depends on X86_64 && PCI 471 depends on X86_EXTENDED_PLATFORM 472 depends on SMP 473 ---help--- 474 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is 475 supposed to run on these EM64T-based machines. Only choose this option 476 if you have one of these machines. 477 478config X86_UV 479 bool "SGI Ultraviolet" 480 depends on X86_64 481 depends on X86_EXTENDED_PLATFORM 482 depends on NUMA 483 depends on EFI 484 depends on X86_X2APIC 485 depends on PCI 486 ---help--- 487 This option is needed in order to support SGI Ultraviolet systems. 488 If you don't have one of these, you should say N here. 489 490# Following is an alphabetically sorted list of 32 bit extended platforms 491# Please maintain the alphabetic order if and when there are additions 492 493config X86_GOLDFISH 494 bool "Goldfish (Virtual Platform)" 495 depends on X86_EXTENDED_PLATFORM 496 ---help--- 497 Enable support for the Goldfish virtual platform used primarily 498 for Android development. Unless you are building for the Android 499 Goldfish emulator say N here. 500 501config X86_INTEL_CE 502 bool "CE4100 TV platform" 503 depends on PCI 504 depends on PCI_GODIRECT 505 depends on X86_IO_APIC 506 depends on X86_32 507 depends on X86_EXTENDED_PLATFORM 508 select X86_REBOOTFIXUPS 509 select OF 510 select OF_EARLY_FLATTREE 511 ---help--- 512 Select for the Intel CE media processor (CE4100) SOC. 513 This option compiles in support for the CE4100 SOC for settop 514 boxes and media devices. 515 516config X86_INTEL_MID 517 bool "Intel MID platform support" 518 depends on X86_EXTENDED_PLATFORM 519 depends on X86_PLATFORM_DEVICES 520 depends on PCI 521 depends on X86_64 || (PCI_GOANY && X86_32) 522 depends on X86_IO_APIC 523 select SFI 524 select I2C 525 select DW_APB_TIMER 526 select APB_TIMER 527 select INTEL_SCU_IPC 528 select MFD_INTEL_MSIC 529 ---help--- 530 Select to build a kernel capable of supporting Intel MID (Mobile 531 Internet Device) platform systems which do not have the PCI legacy 532 interfaces. If you are building for a PC class system say N here. 533 534 Intel MID platforms are based on an Intel processor and chipset which 535 consume less power than most of the x86 derivatives. 536 537config X86_INTEL_QUARK 538 bool "Intel Quark platform support" 539 depends on X86_32 540 depends on X86_EXTENDED_PLATFORM 541 depends on X86_PLATFORM_DEVICES 542 depends on X86_TSC 543 depends on PCI 544 depends on PCI_GOANY 545 depends on X86_IO_APIC 546 select IOSF_MBI 547 select INTEL_IMR 548 select COMMON_CLK 549 ---help--- 550 Select to include support for Quark X1000 SoC. 551 Say Y here if you have a Quark based system such as the Arduino 552 compatible Intel Galileo. 553 554config X86_INTEL_LPSS 555 bool "Intel Low Power Subsystem Support" 556 depends on X86 && ACPI 557 select COMMON_CLK 558 select PINCTRL 559 select IOSF_MBI 560 ---help--- 561 Select to build support for Intel Low Power Subsystem such as 562 found on Intel Lynxpoint PCH. Selecting this option enables 563 things like clock tree (common clock framework) and pincontrol 564 which are needed by the LPSS peripheral drivers. 565 566config X86_AMD_PLATFORM_DEVICE 567 bool "AMD ACPI2Platform devices support" 568 depends on ACPI 569 select COMMON_CLK 570 select PINCTRL 571 ---help--- 572 Select to interpret AMD specific ACPI device to platform device 573 such as I2C, UART, GPIO found on AMD Carrizo and later chipsets. 574 I2C and UART depend on COMMON_CLK to set clock. GPIO driver is 575 implemented under PINCTRL subsystem. 576 577config IOSF_MBI 578 tristate "Intel SoC IOSF Sideband support for SoC platforms" 579 depends on PCI 580 ---help--- 581 This option enables sideband register access support for Intel SoC 582 platforms. On these platforms the IOSF sideband is used in lieu of 583 MSR's for some register accesses, mostly but not limited to thermal 584 and power. Drivers may query the availability of this device to 585 determine if they need the sideband in order to work on these 586 platforms. The sideband is available on the following SoC products. 587 This list is not meant to be exclusive. 588 - BayTrail 589 - Braswell 590 - Quark 591 592 You should say Y if you are running a kernel on one of these SoC's. 593 594config IOSF_MBI_DEBUG 595 bool "Enable IOSF sideband access through debugfs" 596 depends on IOSF_MBI && DEBUG_FS 597 ---help--- 598 Select this option to expose the IOSF sideband access registers (MCR, 599 MDR, MCRX) through debugfs to write and read register information from 600 different units on the SoC. This is most useful for obtaining device 601 state information for debug and analysis. As this is a general access 602 mechanism, users of this option would have specific knowledge of the 603 device they want to access. 604 605 If you don't require the option or are in doubt, say N. 606 607config X86_RDC321X 608 bool "RDC R-321x SoC" 609 depends on X86_32 610 depends on X86_EXTENDED_PLATFORM 611 select M486 612 select X86_REBOOTFIXUPS 613 ---help--- 614 This option is needed for RDC R-321x system-on-chip, also known 615 as R-8610-(G). 616 If you don't have one of these chips, you should say N here. 617 618config X86_32_NON_STANDARD 619 bool "Support non-standard 32-bit SMP architectures" 620 depends on X86_32 && SMP 621 depends on X86_EXTENDED_PLATFORM 622 ---help--- 623 This option compiles in the bigsmp and STA2X11 default 624 subarchitectures. It is intended for a generic binary 625 kernel. If you select them all, kernel will probe it one by 626 one and will fallback to default. 627 628# Alphabetically sorted list of Non standard 32 bit platforms 629 630config X86_SUPPORTS_MEMORY_FAILURE 631 def_bool y 632 # MCE code calls memory_failure(): 633 depends on X86_MCE 634 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags: 635 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH: 636 depends on X86_64 || !SPARSEMEM 637 select ARCH_SUPPORTS_MEMORY_FAILURE 638 639config STA2X11 640 bool "STA2X11 Companion Chip Support" 641 depends on X86_32_NON_STANDARD && PCI 642 select X86_DEV_DMA_OPS 643 select X86_DMA_REMAP 644 select SWIOTLB 645 select MFD_STA2X11 646 select ARCH_REQUIRE_GPIOLIB 647 default n 648 ---help--- 649 This adds support for boards based on the STA2X11 IO-Hub, 650 a.k.a. "ConneXt". The chip is used in place of the standard 651 PC chipset, so all "standard" peripherals are missing. If this 652 option is selected the kernel will still be able to boot on 653 standard PC machines. 654 655config X86_32_IRIS 656 tristate "Eurobraille/Iris poweroff module" 657 depends on X86_32 658 ---help--- 659 The Iris machines from EuroBraille do not have APM or ACPI support 660 to shut themselves down properly. A special I/O sequence is 661 needed to do so, which is what this module does at 662 kernel shutdown. 663 664 This is only for Iris machines from EuroBraille. 665 666 If unused, say N. 667 668config SCHED_OMIT_FRAME_POINTER 669 def_bool y 670 prompt "Single-depth WCHAN output" 671 depends on X86 672 ---help--- 673 Calculate simpler /proc/<PID>/wchan values. If this option 674 is disabled then wchan values will recurse back to the 675 caller function. This provides more accurate wchan values, 676 at the expense of slightly more scheduling overhead. 677 678 If in doubt, say "Y". 679 680menuconfig HYPERVISOR_GUEST 681 bool "Linux guest support" 682 ---help--- 683 Say Y here to enable options for running Linux under various hyper- 684 visors. This option enables basic hypervisor detection and platform 685 setup. 686 687 If you say N, all options in this submenu will be skipped and 688 disabled, and Linux guest support won't be built in. 689 690if HYPERVISOR_GUEST 691 692config PARAVIRT 693 bool "Enable paravirtualization code" 694 ---help--- 695 This changes the kernel so it can modify itself when it is run 696 under a hypervisor, potentially improving performance significantly 697 over full virtualization. However, when run without a hypervisor 698 the kernel is theoretically slower and slightly larger. 699 700config PARAVIRT_DEBUG 701 bool "paravirt-ops debugging" 702 depends on PARAVIRT && DEBUG_KERNEL 703 ---help--- 704 Enable to debug paravirt_ops internals. Specifically, BUG if 705 a paravirt_op is missing when it is called. 706 707config PARAVIRT_SPINLOCKS 708 bool "Paravirtualization layer for spinlocks" 709 depends on PARAVIRT && SMP 710 select UNINLINE_SPIN_UNLOCK if !QUEUED_SPINLOCKS 711 ---help--- 712 Paravirtualized spinlocks allow a pvops backend to replace the 713 spinlock implementation with something virtualization-friendly 714 (for example, block the virtual CPU rather than spinning). 715 716 It has a minimal impact on native kernels and gives a nice performance 717 benefit on paravirtualized KVM / Xen kernels. 718 719 If you are unsure how to answer this question, answer Y. 720 721config QUEUED_LOCK_STAT 722 bool "Paravirt queued spinlock statistics" 723 depends on PARAVIRT_SPINLOCKS && DEBUG_FS && QUEUED_SPINLOCKS 724 ---help--- 725 Enable the collection of statistical data on the slowpath 726 behavior of paravirtualized queued spinlocks and report 727 them on debugfs. 728 729source "arch/x86/xen/Kconfig" 730 731config KVM_GUEST 732 bool "KVM Guest support (including kvmclock)" 733 depends on PARAVIRT 734 select PARAVIRT_CLOCK 735 default y 736 ---help--- 737 This option enables various optimizations for running under the KVM 738 hypervisor. It includes a paravirtualized clock, so that instead 739 of relying on a PIT (or probably other) emulation by the 740 underlying device model, the host provides the guest with 741 timing infrastructure such as time of day, and system time 742 743config KVM_DEBUG_FS 744 bool "Enable debug information for KVM Guests in debugfs" 745 depends on KVM_GUEST && DEBUG_FS 746 default n 747 ---help--- 748 This option enables collection of various statistics for KVM guest. 749 Statistics are displayed in debugfs filesystem. Enabling this option 750 may incur significant overhead. 751 752source "arch/x86/lguest/Kconfig" 753 754config PARAVIRT_TIME_ACCOUNTING 755 bool "Paravirtual steal time accounting" 756 depends on PARAVIRT 757 default n 758 ---help--- 759 Select this option to enable fine granularity task steal time 760 accounting. Time spent executing other tasks in parallel with 761 the current vCPU is discounted from the vCPU power. To account for 762 that, there can be a small performance impact. 763 764 If in doubt, say N here. 765 766config PARAVIRT_CLOCK 767 bool 768 769endif #HYPERVISOR_GUEST 770 771config NO_BOOTMEM 772 def_bool y 773 774source "arch/x86/Kconfig.cpu" 775 776config HPET_TIMER 777 def_bool X86_64 778 prompt "HPET Timer Support" if X86_32 779 ---help--- 780 Use the IA-PC HPET (High Precision Event Timer) to manage 781 time in preference to the PIT and RTC, if a HPET is 782 present. 783 HPET is the next generation timer replacing legacy 8254s. 784 The HPET provides a stable time base on SMP 785 systems, unlike the TSC, but it is more expensive to access, 786 as it is off-chip. The interface used is documented 787 in the HPET spec, revision 1. 788 789 You can safely choose Y here. However, HPET will only be 790 activated if the platform and the BIOS support this feature. 791 Otherwise the 8254 will be used for timing services. 792 793 Choose N to continue using the legacy 8254 timer. 794 795config HPET_EMULATE_RTC 796 def_bool y 797 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y) 798 799config APB_TIMER 800 def_bool y if X86_INTEL_MID 801 prompt "Intel MID APB Timer Support" if X86_INTEL_MID 802 select DW_APB_TIMER 803 depends on X86_INTEL_MID && SFI 804 help 805 APB timer is the replacement for 8254, HPET on X86 MID platforms. 806 The APBT provides a stable time base on SMP 807 systems, unlike the TSC, but it is more expensive to access, 808 as it is off-chip. APB timers are always running regardless of CPU 809 C states, they are used as per CPU clockevent device when possible. 810 811# Mark as expert because too many people got it wrong. 812# The code disables itself when not needed. 813config DMI 814 default y 815 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK 816 bool "Enable DMI scanning" if EXPERT 817 ---help--- 818 Enabled scanning of DMI to identify machine quirks. Say Y 819 here unless you have verified that your setup is not 820 affected by entries in the DMI blacklist. Required by PNP 821 BIOS code. 822 823config GART_IOMMU 824 bool "Old AMD GART IOMMU support" 825 select SWIOTLB 826 depends on X86_64 && PCI && AMD_NB 827 ---help--- 828 Provides a driver for older AMD Athlon64/Opteron/Turion/Sempron 829 GART based hardware IOMMUs. 830 831 The GART supports full DMA access for devices with 32-bit access 832 limitations, on systems with more than 3 GB. This is usually needed 833 for USB, sound, many IDE/SATA chipsets and some other devices. 834 835 Newer systems typically have a modern AMD IOMMU, supported via 836 the CONFIG_AMD_IOMMU=y config option. 837 838 In normal configurations this driver is only active when needed: 839 there's more than 3 GB of memory and the system contains a 840 32-bit limited device. 841 842 If unsure, say Y. 843 844config CALGARY_IOMMU 845 bool "IBM Calgary IOMMU support" 846 select SWIOTLB 847 depends on X86_64 && PCI 848 ---help--- 849 Support for hardware IOMMUs in IBM's xSeries x366 and x460 850 systems. Needed to run systems with more than 3GB of memory 851 properly with 32-bit PCI devices that do not support DAC 852 (Double Address Cycle). Calgary also supports bus level 853 isolation, where all DMAs pass through the IOMMU. This 854 prevents them from going anywhere except their intended 855 destination. This catches hard-to-find kernel bugs and 856 mis-behaving drivers and devices that do not use the DMA-API 857 properly to set up their DMA buffers. The IOMMU can be 858 turned off at boot time with the iommu=off parameter. 859 Normally the kernel will make the right choice by itself. 860 If unsure, say Y. 861 862config CALGARY_IOMMU_ENABLED_BY_DEFAULT 863 def_bool y 864 prompt "Should Calgary be enabled by default?" 865 depends on CALGARY_IOMMU 866 ---help--- 867 Should Calgary be enabled by default? if you choose 'y', Calgary 868 will be used (if it exists). If you choose 'n', Calgary will not be 869 used even if it exists. If you choose 'n' and would like to use 870 Calgary anyway, pass 'iommu=calgary' on the kernel command line. 871 If unsure, say Y. 872 873# need this always selected by IOMMU for the VIA workaround 874config SWIOTLB 875 def_bool y if X86_64 876 ---help--- 877 Support for software bounce buffers used on x86-64 systems 878 which don't have a hardware IOMMU. Using this PCI devices 879 which can only access 32-bits of memory can be used on systems 880 with more than 3 GB of memory. 881 If unsure, say Y. 882 883config IOMMU_HELPER 884 def_bool y 885 depends on CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU 886 887config MAXSMP 888 bool "Enable Maximum number of SMP Processors and NUMA Nodes" 889 depends on X86_64 && SMP && DEBUG_KERNEL 890 select CPUMASK_OFFSTACK 891 ---help--- 892 Enable maximum number of CPUS and NUMA Nodes for this architecture. 893 If unsure, say N. 894 895config NR_CPUS 896 int "Maximum number of CPUs" if SMP && !MAXSMP 897 range 2 8 if SMP && X86_32 && !X86_BIGSMP 898 range 2 512 if SMP && !MAXSMP && !CPUMASK_OFFSTACK 899 range 2 8192 if SMP && !MAXSMP && CPUMASK_OFFSTACK && X86_64 900 default "1" if !SMP 901 default "8192" if MAXSMP 902 default "32" if SMP && X86_BIGSMP 903 default "8" if SMP && X86_32 904 default "64" if SMP 905 ---help--- 906 This allows you to specify the maximum number of CPUs which this 907 kernel will support. If CPUMASK_OFFSTACK is enabled, the maximum 908 supported value is 8192, otherwise the maximum value is 512. The 909 minimum value which makes sense is 2. 910 911 This is purely to save memory - each supported CPU adds 912 approximately eight kilobytes to the kernel image. 913 914config SCHED_SMT 915 bool "SMT (Hyperthreading) scheduler support" 916 depends on SMP 917 ---help--- 918 SMT scheduler support improves the CPU scheduler's decision making 919 when dealing with Intel Pentium 4 chips with HyperThreading at a 920 cost of slightly increased overhead in some places. If unsure say 921 N here. 922 923config SCHED_MC 924 def_bool y 925 prompt "Multi-core scheduler support" 926 depends on SMP 927 ---help--- 928 Multi-core scheduler support improves the CPU scheduler's decision 929 making when dealing with multi-core CPU chips at a cost of slightly 930 increased overhead in some places. If unsure say N here. 931 932source "kernel/Kconfig.preempt" 933 934config UP_LATE_INIT 935 def_bool y 936 depends on !SMP && X86_LOCAL_APIC 937 938config X86_UP_APIC 939 bool "Local APIC support on uniprocessors" if !PCI_MSI 940 default PCI_MSI 941 depends on X86_32 && !SMP && !X86_32_NON_STANDARD 942 ---help--- 943 A local APIC (Advanced Programmable Interrupt Controller) is an 944 integrated interrupt controller in the CPU. If you have a single-CPU 945 system which has a processor with a local APIC, you can say Y here to 946 enable and use it. If you say Y here even though your machine doesn't 947 have a local APIC, then the kernel will still run with no slowdown at 948 all. The local APIC supports CPU-generated self-interrupts (timer, 949 performance counters), and the NMI watchdog which detects hard 950 lockups. 951 952config X86_UP_IOAPIC 953 bool "IO-APIC support on uniprocessors" 954 depends on X86_UP_APIC 955 ---help--- 956 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an 957 SMP-capable replacement for PC-style interrupt controllers. Most 958 SMP systems and many recent uniprocessor systems have one. 959 960 If you have a single-CPU system with an IO-APIC, you can say Y here 961 to use it. If you say Y here even though your machine doesn't have 962 an IO-APIC, then the kernel will still run with no slowdown at all. 963 964config X86_LOCAL_APIC 965 def_bool y 966 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC || PCI_MSI 967 select IRQ_DOMAIN_HIERARCHY 968 select PCI_MSI_IRQ_DOMAIN if PCI_MSI 969 970config X86_IO_APIC 971 def_bool y 972 depends on X86_LOCAL_APIC || X86_UP_IOAPIC 973 974config X86_REROUTE_FOR_BROKEN_BOOT_IRQS 975 bool "Reroute for broken boot IRQs" 976 depends on X86_IO_APIC 977 ---help--- 978 This option enables a workaround that fixes a source of 979 spurious interrupts. This is recommended when threaded 980 interrupt handling is used on systems where the generation of 981 superfluous "boot interrupts" cannot be disabled. 982 983 Some chipsets generate a legacy INTx "boot IRQ" when the IRQ 984 entry in the chipset's IO-APIC is masked (as, e.g. the RT 985 kernel does during interrupt handling). On chipsets where this 986 boot IRQ generation cannot be disabled, this workaround keeps 987 the original IRQ line masked so that only the equivalent "boot 988 IRQ" is delivered to the CPUs. The workaround also tells the 989 kernel to set up the IRQ handler on the boot IRQ line. In this 990 way only one interrupt is delivered to the kernel. Otherwise 991 the spurious second interrupt may cause the kernel to bring 992 down (vital) interrupt lines. 993 994 Only affects "broken" chipsets. Interrupt sharing may be 995 increased on these systems. 996 997config X86_MCE 998 bool "Machine Check / overheating reporting" 999 select GENERIC_ALLOCATOR 1000 default y 1001 ---help--- 1002 Machine Check support allows the processor to notify the 1003 kernel if it detects a problem (e.g. overheating, data corruption). 1004 The action the kernel takes depends on the severity of the problem, 1005 ranging from warning messages to halting the machine. 1006 1007config X86_MCE_INTEL 1008 def_bool y 1009 prompt "Intel MCE features" 1010 depends on X86_MCE && X86_LOCAL_APIC 1011 ---help--- 1012 Additional support for intel specific MCE features such as 1013 the thermal monitor. 1014 1015config X86_MCE_AMD 1016 def_bool y 1017 prompt "AMD MCE features" 1018 depends on X86_MCE && X86_LOCAL_APIC 1019 ---help--- 1020 Additional support for AMD specific MCE features such as 1021 the DRAM Error Threshold. 1022 1023config X86_ANCIENT_MCE 1024 bool "Support for old Pentium 5 / WinChip machine checks" 1025 depends on X86_32 && X86_MCE 1026 ---help--- 1027 Include support for machine check handling on old Pentium 5 or WinChip 1028 systems. These typically need to be enabled explicitly on the command 1029 line. 1030 1031config X86_MCE_THRESHOLD 1032 depends on X86_MCE_AMD || X86_MCE_INTEL 1033 def_bool y 1034 1035config X86_MCE_INJECT 1036 depends on X86_MCE 1037 tristate "Machine check injector support" 1038 ---help--- 1039 Provide support for injecting machine checks for testing purposes. 1040 If you don't know what a machine check is and you don't do kernel 1041 QA it is safe to say n. 1042 1043config X86_THERMAL_VECTOR 1044 def_bool y 1045 depends on X86_MCE_INTEL 1046 1047source "arch/x86/events/Kconfig" 1048 1049config X86_LEGACY_VM86 1050 bool "Legacy VM86 support" 1051 default n 1052 depends on X86_32 1053 ---help--- 1054 This option allows user programs to put the CPU into V8086 1055 mode, which is an 80286-era approximation of 16-bit real mode. 1056 1057 Some very old versions of X and/or vbetool require this option 1058 for user mode setting. Similarly, DOSEMU will use it if 1059 available to accelerate real mode DOS programs. However, any 1060 recent version of DOSEMU, X, or vbetool should be fully 1061 functional even without kernel VM86 support, as they will all 1062 fall back to software emulation. Nevertheless, if you are using 1063 a 16-bit DOS program where 16-bit performance matters, vm86 1064 mode might be faster than emulation and you might want to 1065 enable this option. 1066 1067 Note that any app that works on a 64-bit kernel is unlikely to 1068 need this option, as 64-bit kernels don't, and can't, support 1069 V8086 mode. This option is also unrelated to 16-bit protected 1070 mode and is not needed to run most 16-bit programs under Wine. 1071 1072 Enabling this option increases the complexity of the kernel 1073 and slows down exception handling a tiny bit. 1074 1075 If unsure, say N here. 1076 1077config VM86 1078 bool 1079 default X86_LEGACY_VM86 1080 1081config X86_16BIT 1082 bool "Enable support for 16-bit segments" if EXPERT 1083 default y 1084 depends on MODIFY_LDT_SYSCALL 1085 ---help--- 1086 This option is required by programs like Wine to run 16-bit 1087 protected mode legacy code on x86 processors. Disabling 1088 this option saves about 300 bytes on i386, or around 6K text 1089 plus 16K runtime memory on x86-64, 1090 1091config X86_ESPFIX32 1092 def_bool y 1093 depends on X86_16BIT && X86_32 1094 1095config X86_ESPFIX64 1096 def_bool y 1097 depends on X86_16BIT && X86_64 1098 1099config X86_VSYSCALL_EMULATION 1100 bool "Enable vsyscall emulation" if EXPERT 1101 default y 1102 depends on X86_64 1103 ---help--- 1104 This enables emulation of the legacy vsyscall page. Disabling 1105 it is roughly equivalent to booting with vsyscall=none, except 1106 that it will also disable the helpful warning if a program 1107 tries to use a vsyscall. With this option set to N, offending 1108 programs will just segfault, citing addresses of the form 1109 0xffffffffff600?00. 1110 1111 This option is required by many programs built before 2013, and 1112 care should be used even with newer programs if set to N. 1113 1114 Disabling this option saves about 7K of kernel size and 1115 possibly 4K of additional runtime pagetable memory. 1116 1117config TOSHIBA 1118 tristate "Toshiba Laptop support" 1119 depends on X86_32 1120 ---help--- 1121 This adds a driver to safely access the System Management Mode of 1122 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does 1123 not work on models with a Phoenix BIOS. The System Management Mode 1124 is used to set the BIOS and power saving options on Toshiba portables. 1125 1126 For information on utilities to make use of this driver see the 1127 Toshiba Linux utilities web site at: 1128 <http://www.buzzard.org.uk/toshiba/>. 1129 1130 Say Y if you intend to run this kernel on a Toshiba portable. 1131 Say N otherwise. 1132 1133config I8K 1134 tristate "Dell i8k legacy laptop support" 1135 select HWMON 1136 select SENSORS_DELL_SMM 1137 ---help--- 1138 This option enables legacy /proc/i8k userspace interface in hwmon 1139 dell-smm-hwmon driver. Character file /proc/i8k reports bios version, 1140 temperature and allows controlling fan speeds of Dell laptops via 1141 System Management Mode. For old Dell laptops (like Dell Inspiron 8000) 1142 it reports also power and hotkey status. For fan speed control is 1143 needed userspace package i8kutils. 1144 1145 Say Y if you intend to run this kernel on old Dell laptops or want to 1146 use userspace package i8kutils. 1147 Say N otherwise. 1148 1149config X86_REBOOTFIXUPS 1150 bool "Enable X86 board specific fixups for reboot" 1151 depends on X86_32 1152 ---help--- 1153 This enables chipset and/or board specific fixups to be done 1154 in order to get reboot to work correctly. This is only needed on 1155 some combinations of hardware and BIOS. The symptom, for which 1156 this config is intended, is when reboot ends with a stalled/hung 1157 system. 1158 1159 Currently, the only fixup is for the Geode machines using 1160 CS5530A and CS5536 chipsets and the RDC R-321x SoC. 1161 1162 Say Y if you want to enable the fixup. Currently, it's safe to 1163 enable this option even if you don't need it. 1164 Say N otherwise. 1165 1166config MICROCODE 1167 bool "CPU microcode loading support" 1168 default y 1169 depends on CPU_SUP_AMD || CPU_SUP_INTEL 1170 select FW_LOADER 1171 ---help--- 1172 If you say Y here, you will be able to update the microcode on 1173 Intel and AMD processors. The Intel support is for the IA32 family, 1174 e.g. Pentium Pro, Pentium II, Pentium III, Pentium 4, Xeon etc. The 1175 AMD support is for families 0x10 and later. You will obviously need 1176 the actual microcode binary data itself which is not shipped with 1177 the Linux kernel. 1178 1179 The preferred method to load microcode from a detached initrd is described 1180 in Documentation/x86/early-microcode.txt. For that you need to enable 1181 CONFIG_BLK_DEV_INITRD in order for the loader to be able to scan the 1182 initrd for microcode blobs. 1183 1184 In addition, you can build-in the microcode into the kernel. For that you 1185 need to enable FIRMWARE_IN_KERNEL and add the vendor-supplied microcode 1186 to the CONFIG_EXTRA_FIRMWARE config option. 1187 1188config MICROCODE_INTEL 1189 bool "Intel microcode loading support" 1190 depends on MICROCODE 1191 default MICROCODE 1192 select FW_LOADER 1193 ---help--- 1194 This options enables microcode patch loading support for Intel 1195 processors. 1196 1197 For the current Intel microcode data package go to 1198 <https://downloadcenter.intel.com> and search for 1199 'Linux Processor Microcode Data File'. 1200 1201config MICROCODE_AMD 1202 bool "AMD microcode loading support" 1203 depends on MICROCODE 1204 select FW_LOADER 1205 ---help--- 1206 If you select this option, microcode patch loading support for AMD 1207 processors will be enabled. 1208 1209config MICROCODE_OLD_INTERFACE 1210 def_bool y 1211 depends on MICROCODE 1212 1213config X86_MSR 1214 tristate "/dev/cpu/*/msr - Model-specific register support" 1215 ---help--- 1216 This device gives privileged processes access to the x86 1217 Model-Specific Registers (MSRs). It is a character device with 1218 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr. 1219 MSR accesses are directed to a specific CPU on multi-processor 1220 systems. 1221 1222config X86_CPUID 1223 tristate "/dev/cpu/*/cpuid - CPU information support" 1224 ---help--- 1225 This device gives processes access to the x86 CPUID instruction to 1226 be executed on a specific processor. It is a character device 1227 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to 1228 /dev/cpu/31/cpuid. 1229 1230choice 1231 prompt "High Memory Support" 1232 default HIGHMEM4G 1233 depends on X86_32 1234 1235config NOHIGHMEM 1236 bool "off" 1237 ---help--- 1238 Linux can use up to 64 Gigabytes of physical memory on x86 systems. 1239 However, the address space of 32-bit x86 processors is only 4 1240 Gigabytes large. That means that, if you have a large amount of 1241 physical memory, not all of it can be "permanently mapped" by the 1242 kernel. The physical memory that's not permanently mapped is called 1243 "high memory". 1244 1245 If you are compiling a kernel which will never run on a machine with 1246 more than 1 Gigabyte total physical RAM, answer "off" here (default 1247 choice and suitable for most users). This will result in a "3GB/1GB" 1248 split: 3GB are mapped so that each process sees a 3GB virtual memory 1249 space and the remaining part of the 4GB virtual memory space is used 1250 by the kernel to permanently map as much physical memory as 1251 possible. 1252 1253 If the machine has between 1 and 4 Gigabytes physical RAM, then 1254 answer "4GB" here. 1255 1256 If more than 4 Gigabytes is used then answer "64GB" here. This 1257 selection turns Intel PAE (Physical Address Extension) mode on. 1258 PAE implements 3-level paging on IA32 processors. PAE is fully 1259 supported by Linux, PAE mode is implemented on all recent Intel 1260 processors (Pentium Pro and better). NOTE: If you say "64GB" here, 1261 then the kernel will not boot on CPUs that don't support PAE! 1262 1263 The actual amount of total physical memory will either be 1264 auto detected or can be forced by using a kernel command line option 1265 such as "mem=256M". (Try "man bootparam" or see the documentation of 1266 your boot loader (lilo or loadlin) about how to pass options to the 1267 kernel at boot time.) 1268 1269 If unsure, say "off". 1270 1271config HIGHMEM4G 1272 bool "4GB" 1273 ---help--- 1274 Select this if you have a 32-bit processor and between 1 and 4 1275 gigabytes of physical RAM. 1276 1277config HIGHMEM64G 1278 bool "64GB" 1279 depends on !M486 1280 select X86_PAE 1281 ---help--- 1282 Select this if you have a 32-bit processor and more than 4 1283 gigabytes of physical RAM. 1284 1285endchoice 1286 1287choice 1288 prompt "Memory split" if EXPERT 1289 default VMSPLIT_3G 1290 depends on X86_32 1291 ---help--- 1292 Select the desired split between kernel and user memory. 1293 1294 If the address range available to the kernel is less than the 1295 physical memory installed, the remaining memory will be available 1296 as "high memory". Accessing high memory is a little more costly 1297 than low memory, as it needs to be mapped into the kernel first. 1298 Note that increasing the kernel address space limits the range 1299 available to user programs, making the address space there 1300 tighter. Selecting anything other than the default 3G/1G split 1301 will also likely make your kernel incompatible with binary-only 1302 kernel modules. 1303 1304 If you are not absolutely sure what you are doing, leave this 1305 option alone! 1306 1307 config VMSPLIT_3G 1308 bool "3G/1G user/kernel split" 1309 config VMSPLIT_3G_OPT 1310 depends on !X86_PAE 1311 bool "3G/1G user/kernel split (for full 1G low memory)" 1312 config VMSPLIT_2G 1313 bool "2G/2G user/kernel split" 1314 config VMSPLIT_2G_OPT 1315 depends on !X86_PAE 1316 bool "2G/2G user/kernel split (for full 2G low memory)" 1317 config VMSPLIT_1G 1318 bool "1G/3G user/kernel split" 1319endchoice 1320 1321config PAGE_OFFSET 1322 hex 1323 default 0xB0000000 if VMSPLIT_3G_OPT 1324 default 0x80000000 if VMSPLIT_2G 1325 default 0x78000000 if VMSPLIT_2G_OPT 1326 default 0x40000000 if VMSPLIT_1G 1327 default 0xC0000000 1328 depends on X86_32 1329 1330config HIGHMEM 1331 def_bool y 1332 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G) 1333 1334config X86_PAE 1335 bool "PAE (Physical Address Extension) Support" 1336 depends on X86_32 && !HIGHMEM4G 1337 select SWIOTLB 1338 ---help--- 1339 PAE is required for NX support, and furthermore enables 1340 larger swapspace support for non-overcommit purposes. It 1341 has the cost of more pagetable lookup overhead, and also 1342 consumes more pagetable space per process. 1343 1344config ARCH_PHYS_ADDR_T_64BIT 1345 def_bool y 1346 depends on X86_64 || X86_PAE 1347 1348config ARCH_DMA_ADDR_T_64BIT 1349 def_bool y 1350 depends on X86_64 || HIGHMEM64G 1351 1352config X86_DIRECT_GBPAGES 1353 def_bool y 1354 depends on X86_64 && !DEBUG_PAGEALLOC && !KMEMCHECK 1355 ---help--- 1356 Certain kernel features effectively disable kernel 1357 linear 1 GB mappings (even if the CPU otherwise 1358 supports them), so don't confuse the user by printing 1359 that we have them enabled. 1360 1361# Common NUMA Features 1362config NUMA 1363 bool "Numa Memory Allocation and Scheduler Support" 1364 depends on SMP 1365 depends on X86_64 || (X86_32 && HIGHMEM64G && X86_BIGSMP) 1366 default y if X86_BIGSMP 1367 ---help--- 1368 Enable NUMA (Non Uniform Memory Access) support. 1369 1370 The kernel will try to allocate memory used by a CPU on the 1371 local memory controller of the CPU and add some more 1372 NUMA awareness to the kernel. 1373 1374 For 64-bit this is recommended if the system is Intel Core i7 1375 (or later), AMD Opteron, or EM64T NUMA. 1376 1377 For 32-bit this is only needed if you boot a 32-bit 1378 kernel on a 64-bit NUMA platform. 1379 1380 Otherwise, you should say N. 1381 1382config AMD_NUMA 1383 def_bool y 1384 prompt "Old style AMD Opteron NUMA detection" 1385 depends on X86_64 && NUMA && PCI 1386 ---help--- 1387 Enable AMD NUMA node topology detection. You should say Y here if 1388 you have a multi processor AMD system. This uses an old method to 1389 read the NUMA configuration directly from the builtin Northbridge 1390 of Opteron. It is recommended to use X86_64_ACPI_NUMA instead, 1391 which also takes priority if both are compiled in. 1392 1393config X86_64_ACPI_NUMA 1394 def_bool y 1395 prompt "ACPI NUMA detection" 1396 depends on X86_64 && NUMA && ACPI && PCI 1397 select ACPI_NUMA 1398 ---help--- 1399 Enable ACPI SRAT based node topology detection. 1400 1401# Some NUMA nodes have memory ranges that span 1402# other nodes. Even though a pfn is valid and 1403# between a node's start and end pfns, it may not 1404# reside on that node. See memmap_init_zone() 1405# for details. 1406config NODES_SPAN_OTHER_NODES 1407 def_bool y 1408 depends on X86_64_ACPI_NUMA 1409 1410config NUMA_EMU 1411 bool "NUMA emulation" 1412 depends on NUMA 1413 ---help--- 1414 Enable NUMA emulation. A flat machine will be split 1415 into virtual nodes when booted with "numa=fake=N", where N is the 1416 number of nodes. This is only useful for debugging. 1417 1418config NODES_SHIFT 1419 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP 1420 range 1 10 1421 default "10" if MAXSMP 1422 default "6" if X86_64 1423 default "3" 1424 depends on NEED_MULTIPLE_NODES 1425 ---help--- 1426 Specify the maximum number of NUMA Nodes available on the target 1427 system. Increases memory reserved to accommodate various tables. 1428 1429config ARCH_HAVE_MEMORY_PRESENT 1430 def_bool y 1431 depends on X86_32 && DISCONTIGMEM 1432 1433config NEED_NODE_MEMMAP_SIZE 1434 def_bool y 1435 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM) 1436 1437config ARCH_FLATMEM_ENABLE 1438 def_bool y 1439 depends on X86_32 && !NUMA 1440 1441config ARCH_DISCONTIGMEM_ENABLE 1442 def_bool y 1443 depends on NUMA && X86_32 1444 1445config ARCH_DISCONTIGMEM_DEFAULT 1446 def_bool y 1447 depends on NUMA && X86_32 1448 1449config ARCH_SPARSEMEM_ENABLE 1450 def_bool y 1451 depends on X86_64 || NUMA || X86_32 || X86_32_NON_STANDARD 1452 select SPARSEMEM_STATIC if X86_32 1453 select SPARSEMEM_VMEMMAP_ENABLE if X86_64 1454 1455config ARCH_SPARSEMEM_DEFAULT 1456 def_bool y 1457 depends on X86_64 1458 1459config ARCH_SELECT_MEMORY_MODEL 1460 def_bool y 1461 depends on ARCH_SPARSEMEM_ENABLE 1462 1463config ARCH_MEMORY_PROBE 1464 bool "Enable sysfs memory/probe interface" 1465 depends on X86_64 && MEMORY_HOTPLUG 1466 help 1467 This option enables a sysfs memory/probe interface for testing. 1468 See Documentation/memory-hotplug.txt for more information. 1469 If you are unsure how to answer this question, answer N. 1470 1471config ARCH_PROC_KCORE_TEXT 1472 def_bool y 1473 depends on X86_64 && PROC_KCORE 1474 1475config ILLEGAL_POINTER_VALUE 1476 hex 1477 default 0 if X86_32 1478 default 0xdead000000000000 if X86_64 1479 1480source "mm/Kconfig" 1481 1482config X86_PMEM_LEGACY_DEVICE 1483 bool 1484 1485config X86_PMEM_LEGACY 1486 tristate "Support non-standard NVDIMMs and ADR protected memory" 1487 depends on PHYS_ADDR_T_64BIT 1488 depends on BLK_DEV 1489 select X86_PMEM_LEGACY_DEVICE 1490 select LIBNVDIMM 1491 help 1492 Treat memory marked using the non-standard e820 type of 12 as used 1493 by the Intel Sandy Bridge-EP reference BIOS as protected memory. 1494 The kernel will offer these regions to the 'pmem' driver so 1495 they can be used for persistent storage. 1496 1497 Say Y if unsure. 1498 1499config HIGHPTE 1500 bool "Allocate 3rd-level pagetables from highmem" 1501 depends on HIGHMEM 1502 ---help--- 1503 The VM uses one page table entry for each page of physical memory. 1504 For systems with a lot of RAM, this can be wasteful of precious 1505 low memory. Setting this option will put user-space page table 1506 entries in high memory. 1507 1508config X86_CHECK_BIOS_CORRUPTION 1509 bool "Check for low memory corruption" 1510 ---help--- 1511 Periodically check for memory corruption in low memory, which 1512 is suspected to be caused by BIOS. Even when enabled in the 1513 configuration, it is disabled at runtime. Enable it by 1514 setting "memory_corruption_check=1" on the kernel command 1515 line. By default it scans the low 64k of memory every 60 1516 seconds; see the memory_corruption_check_size and 1517 memory_corruption_check_period parameters in 1518 Documentation/kernel-parameters.txt to adjust this. 1519 1520 When enabled with the default parameters, this option has 1521 almost no overhead, as it reserves a relatively small amount 1522 of memory and scans it infrequently. It both detects corruption 1523 and prevents it from affecting the running system. 1524 1525 It is, however, intended as a diagnostic tool; if repeatable 1526 BIOS-originated corruption always affects the same memory, 1527 you can use memmap= to prevent the kernel from using that 1528 memory. 1529 1530config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK 1531 bool "Set the default setting of memory_corruption_check" 1532 depends on X86_CHECK_BIOS_CORRUPTION 1533 default y 1534 ---help--- 1535 Set whether the default state of memory_corruption_check is 1536 on or off. 1537 1538config X86_RESERVE_LOW 1539 int "Amount of low memory, in kilobytes, to reserve for the BIOS" 1540 default 64 1541 range 4 640 1542 ---help--- 1543 Specify the amount of low memory to reserve for the BIOS. 1544 1545 The first page contains BIOS data structures that the kernel 1546 must not use, so that page must always be reserved. 1547 1548 By default we reserve the first 64K of physical RAM, as a 1549 number of BIOSes are known to corrupt that memory range 1550 during events such as suspend/resume or monitor cable 1551 insertion, so it must not be used by the kernel. 1552 1553 You can set this to 4 if you are absolutely sure that you 1554 trust the BIOS to get all its memory reservations and usages 1555 right. If you know your BIOS have problems beyond the 1556 default 64K area, you can set this to 640 to avoid using the 1557 entire low memory range. 1558 1559 If you have doubts about the BIOS (e.g. suspend/resume does 1560 not work or there's kernel crashes after certain hardware 1561 hotplug events) then you might want to enable 1562 X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check 1563 typical corruption patterns. 1564 1565 Leave this to the default value of 64 if you are unsure. 1566 1567config MATH_EMULATION 1568 bool 1569 depends on MODIFY_LDT_SYSCALL 1570 prompt "Math emulation" if X86_32 1571 ---help--- 1572 Linux can emulate a math coprocessor (used for floating point 1573 operations) if you don't have one. 486DX and Pentium processors have 1574 a math coprocessor built in, 486SX and 386 do not, unless you added 1575 a 487DX or 387, respectively. (The messages during boot time can 1576 give you some hints here ["man dmesg"].) Everyone needs either a 1577 coprocessor or this emulation. 1578 1579 If you don't have a math coprocessor, you need to say Y here; if you 1580 say Y here even though you have a coprocessor, the coprocessor will 1581 be used nevertheless. (This behavior can be changed with the kernel 1582 command line option "no387", which comes handy if your coprocessor 1583 is broken. Try "man bootparam" or see the documentation of your boot 1584 loader (lilo or loadlin) about how to pass options to the kernel at 1585 boot time.) This means that it is a good idea to say Y here if you 1586 intend to use this kernel on different machines. 1587 1588 More information about the internals of the Linux math coprocessor 1589 emulation can be found in <file:arch/x86/math-emu/README>. 1590 1591 If you are not sure, say Y; apart from resulting in a 66 KB bigger 1592 kernel, it won't hurt. 1593 1594config MTRR 1595 def_bool y 1596 prompt "MTRR (Memory Type Range Register) support" if EXPERT 1597 ---help--- 1598 On Intel P6 family processors (Pentium Pro, Pentium II and later) 1599 the Memory Type Range Registers (MTRRs) may be used to control 1600 processor access to memory ranges. This is most useful if you have 1601 a video (VGA) card on a PCI or AGP bus. Enabling write-combining 1602 allows bus write transfers to be combined into a larger transfer 1603 before bursting over the PCI/AGP bus. This can increase performance 1604 of image write operations 2.5 times or more. Saying Y here creates a 1605 /proc/mtrr file which may be used to manipulate your processor's 1606 MTRRs. Typically the X server should use this. 1607 1608 This code has a reasonably generic interface so that similar 1609 control registers on other processors can be easily supported 1610 as well: 1611 1612 The Cyrix 6x86, 6x86MX and M II processors have Address Range 1613 Registers (ARRs) which provide a similar functionality to MTRRs. For 1614 these, the ARRs are used to emulate the MTRRs. 1615 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two 1616 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing 1617 write-combining. All of these processors are supported by this code 1618 and it makes sense to say Y here if you have one of them. 1619 1620 Saying Y here also fixes a problem with buggy SMP BIOSes which only 1621 set the MTRRs for the boot CPU and not for the secondary CPUs. This 1622 can lead to all sorts of problems, so it's good to say Y here. 1623 1624 You can safely say Y even if your machine doesn't have MTRRs, you'll 1625 just add about 9 KB to your kernel. 1626 1627 See <file:Documentation/x86/mtrr.txt> for more information. 1628 1629config MTRR_SANITIZER 1630 def_bool y 1631 prompt "MTRR cleanup support" 1632 depends on MTRR 1633 ---help--- 1634 Convert MTRR layout from continuous to discrete, so X drivers can 1635 add writeback entries. 1636 1637 Can be disabled with disable_mtrr_cleanup on the kernel command line. 1638 The largest mtrr entry size for a continuous block can be set with 1639 mtrr_chunk_size. 1640 1641 If unsure, say Y. 1642 1643config MTRR_SANITIZER_ENABLE_DEFAULT 1644 int "MTRR cleanup enable value (0-1)" 1645 range 0 1 1646 default "0" 1647 depends on MTRR_SANITIZER 1648 ---help--- 1649 Enable mtrr cleanup default value 1650 1651config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT 1652 int "MTRR cleanup spare reg num (0-7)" 1653 range 0 7 1654 default "1" 1655 depends on MTRR_SANITIZER 1656 ---help--- 1657 mtrr cleanup spare entries default, it can be changed via 1658 mtrr_spare_reg_nr=N on the kernel command line. 1659 1660config X86_PAT 1661 def_bool y 1662 prompt "x86 PAT support" if EXPERT 1663 depends on MTRR 1664 ---help--- 1665 Use PAT attributes to setup page level cache control. 1666 1667 PATs are the modern equivalents of MTRRs and are much more 1668 flexible than MTRRs. 1669 1670 Say N here if you see bootup problems (boot crash, boot hang, 1671 spontaneous reboots) or a non-working video driver. 1672 1673 If unsure, say Y. 1674 1675config ARCH_USES_PG_UNCACHED 1676 def_bool y 1677 depends on X86_PAT 1678 1679config ARCH_RANDOM 1680 def_bool y 1681 prompt "x86 architectural random number generator" if EXPERT 1682 ---help--- 1683 Enable the x86 architectural RDRAND instruction 1684 (Intel Bull Mountain technology) to generate random numbers. 1685 If supported, this is a high bandwidth, cryptographically 1686 secure hardware random number generator. 1687 1688config X86_SMAP 1689 def_bool y 1690 prompt "Supervisor Mode Access Prevention" if EXPERT 1691 ---help--- 1692 Supervisor Mode Access Prevention (SMAP) is a security 1693 feature in newer Intel processors. There is a small 1694 performance cost if this enabled and turned on; there is 1695 also a small increase in the kernel size if this is enabled. 1696 1697 If unsure, say Y. 1698 1699config X86_INTEL_MPX 1700 prompt "Intel MPX (Memory Protection Extensions)" 1701 def_bool n 1702 depends on CPU_SUP_INTEL 1703 ---help--- 1704 MPX provides hardware features that can be used in 1705 conjunction with compiler-instrumented code to check 1706 memory references. It is designed to detect buffer 1707 overflow or underflow bugs. 1708 1709 This option enables running applications which are 1710 instrumented or otherwise use MPX. It does not use MPX 1711 itself inside the kernel or to protect the kernel 1712 against bad memory references. 1713 1714 Enabling this option will make the kernel larger: 1715 ~8k of kernel text and 36 bytes of data on a 64-bit 1716 defconfig. It adds a long to the 'mm_struct' which 1717 will increase the kernel memory overhead of each 1718 process and adds some branches to paths used during 1719 exec() and munmap(). 1720 1721 For details, see Documentation/x86/intel_mpx.txt 1722 1723 If unsure, say N. 1724 1725config X86_INTEL_MEMORY_PROTECTION_KEYS 1726 prompt "Intel Memory Protection Keys" 1727 def_bool y 1728 # Note: only available in 64-bit mode 1729 depends on CPU_SUP_INTEL && X86_64 1730 ---help--- 1731 Memory Protection Keys provides a mechanism for enforcing 1732 page-based protections, but without requiring modification of the 1733 page tables when an application changes protection domains. 1734 1735 For details, see Documentation/x86/protection-keys.txt 1736 1737 If unsure, say y. 1738 1739config EFI 1740 bool "EFI runtime service support" 1741 depends on ACPI 1742 select UCS2_STRING 1743 select EFI_RUNTIME_WRAPPERS 1744 ---help--- 1745 This enables the kernel to use EFI runtime services that are 1746 available (such as the EFI variable services). 1747 1748 This option is only useful on systems that have EFI firmware. 1749 In addition, you should use the latest ELILO loader available 1750 at <http://elilo.sourceforge.net> in order to take advantage 1751 of EFI runtime services. However, even with this option, the 1752 resultant kernel should continue to boot on existing non-EFI 1753 platforms. 1754 1755config EFI_STUB 1756 bool "EFI stub support" 1757 depends on EFI && !X86_USE_3DNOW 1758 select RELOCATABLE 1759 ---help--- 1760 This kernel feature allows a bzImage to be loaded directly 1761 by EFI firmware without the use of a bootloader. 1762 1763 See Documentation/efi-stub.txt for more information. 1764 1765config EFI_MIXED 1766 bool "EFI mixed-mode support" 1767 depends on EFI_STUB && X86_64 1768 ---help--- 1769 Enabling this feature allows a 64-bit kernel to be booted 1770 on a 32-bit firmware, provided that your CPU supports 64-bit 1771 mode. 1772 1773 Note that it is not possible to boot a mixed-mode enabled 1774 kernel via the EFI boot stub - a bootloader that supports 1775 the EFI handover protocol must be used. 1776 1777 If unsure, say N. 1778 1779config SECCOMP 1780 def_bool y 1781 prompt "Enable seccomp to safely compute untrusted bytecode" 1782 ---help--- 1783 This kernel feature is useful for number crunching applications 1784 that may need to compute untrusted bytecode during their 1785 execution. By using pipes or other transports made available to 1786 the process as file descriptors supporting the read/write 1787 syscalls, it's possible to isolate those applications in 1788 their own address space using seccomp. Once seccomp is 1789 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled 1790 and the task is only allowed to execute a few safe syscalls 1791 defined by each seccomp mode. 1792 1793 If unsure, say Y. Only embedded should say N here. 1794 1795source kernel/Kconfig.hz 1796 1797config KEXEC 1798 bool "kexec system call" 1799 select KEXEC_CORE 1800 ---help--- 1801 kexec is a system call that implements the ability to shutdown your 1802 current kernel, and to start another kernel. It is like a reboot 1803 but it is independent of the system firmware. And like a reboot 1804 you can start any kernel with it, not just Linux. 1805 1806 The name comes from the similarity to the exec system call. 1807 1808 It is an ongoing process to be certain the hardware in a machine 1809 is properly shutdown, so do not be surprised if this code does not 1810 initially work for you. As of this writing the exact hardware 1811 interface is strongly in flux, so no good recommendation can be 1812 made. 1813 1814config KEXEC_FILE 1815 bool "kexec file based system call" 1816 select KEXEC_CORE 1817 select BUILD_BIN2C 1818 depends on X86_64 1819 depends on CRYPTO=y 1820 depends on CRYPTO_SHA256=y 1821 ---help--- 1822 This is new version of kexec system call. This system call is 1823 file based and takes file descriptors as system call argument 1824 for kernel and initramfs as opposed to list of segments as 1825 accepted by previous system call. 1826 1827config KEXEC_VERIFY_SIG 1828 bool "Verify kernel signature during kexec_file_load() syscall" 1829 depends on KEXEC_FILE 1830 ---help--- 1831 This option makes kernel signature verification mandatory for 1832 the kexec_file_load() syscall. 1833 1834 In addition to that option, you need to enable signature 1835 verification for the corresponding kernel image type being 1836 loaded in order for this to work. 1837 1838config KEXEC_BZIMAGE_VERIFY_SIG 1839 bool "Enable bzImage signature verification support" 1840 depends on KEXEC_VERIFY_SIG 1841 depends on SIGNED_PE_FILE_VERIFICATION 1842 select SYSTEM_TRUSTED_KEYRING 1843 ---help--- 1844 Enable bzImage signature verification support. 1845 1846config CRASH_DUMP 1847 bool "kernel crash dumps" 1848 depends on X86_64 || (X86_32 && HIGHMEM) 1849 ---help--- 1850 Generate crash dump after being started by kexec. 1851 This should be normally only set in special crash dump kernels 1852 which are loaded in the main kernel with kexec-tools into 1853 a specially reserved region and then later executed after 1854 a crash by kdump/kexec. The crash dump kernel must be compiled 1855 to a memory address not used by the main kernel or BIOS using 1856 PHYSICAL_START, or it must be built as a relocatable image 1857 (CONFIG_RELOCATABLE=y). 1858 For more details see Documentation/kdump/kdump.txt 1859 1860config KEXEC_JUMP 1861 bool "kexec jump" 1862 depends on KEXEC && HIBERNATION 1863 ---help--- 1864 Jump between original kernel and kexeced kernel and invoke 1865 code in physical address mode via KEXEC 1866 1867config PHYSICAL_START 1868 hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP) 1869 default "0x1000000" 1870 ---help--- 1871 This gives the physical address where the kernel is loaded. 1872 1873 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then 1874 bzImage will decompress itself to above physical address and 1875 run from there. Otherwise, bzImage will run from the address where 1876 it has been loaded by the boot loader and will ignore above physical 1877 address. 1878 1879 In normal kdump cases one does not have to set/change this option 1880 as now bzImage can be compiled as a completely relocatable image 1881 (CONFIG_RELOCATABLE=y) and be used to load and run from a different 1882 address. This option is mainly useful for the folks who don't want 1883 to use a bzImage for capturing the crash dump and want to use a 1884 vmlinux instead. vmlinux is not relocatable hence a kernel needs 1885 to be specifically compiled to run from a specific memory area 1886 (normally a reserved region) and this option comes handy. 1887 1888 So if you are using bzImage for capturing the crash dump, 1889 leave the value here unchanged to 0x1000000 and set 1890 CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux 1891 for capturing the crash dump change this value to start of 1892 the reserved region. In other words, it can be set based on 1893 the "X" value as specified in the "crashkernel=YM@XM" 1894 command line boot parameter passed to the panic-ed 1895 kernel. Please take a look at Documentation/kdump/kdump.txt 1896 for more details about crash dumps. 1897 1898 Usage of bzImage for capturing the crash dump is recommended as 1899 one does not have to build two kernels. Same kernel can be used 1900 as production kernel and capture kernel. Above option should have 1901 gone away after relocatable bzImage support is introduced. But it 1902 is present because there are users out there who continue to use 1903 vmlinux for dump capture. This option should go away down the 1904 line. 1905 1906 Don't change this unless you know what you are doing. 1907 1908config RELOCATABLE 1909 bool "Build a relocatable kernel" 1910 default y 1911 ---help--- 1912 This builds a kernel image that retains relocation information 1913 so it can be loaded someplace besides the default 1MB. 1914 The relocations tend to make the kernel binary about 10% larger, 1915 but are discarded at runtime. 1916 1917 One use is for the kexec on panic case where the recovery kernel 1918 must live at a different physical address than the primary 1919 kernel. 1920 1921 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address 1922 it has been loaded at and the compile time physical address 1923 (CONFIG_PHYSICAL_START) is used as the minimum location. 1924 1925config RANDOMIZE_BASE 1926 bool "Randomize the address of the kernel image (KASLR)" 1927 depends on RELOCATABLE 1928 default n 1929 ---help--- 1930 In support of Kernel Address Space Layout Randomization (KASLR), 1931 this randomizes the physical address at which the kernel image 1932 is decompressed and the virtual address where the kernel 1933 image is mapped, as a security feature that deters exploit 1934 attempts relying on knowledge of the location of kernel 1935 code internals. 1936 1937 The kernel physical and virtual address can be randomized 1938 from 16MB up to 1GB on 64-bit and 512MB on 32-bit. (Note that 1939 using RANDOMIZE_BASE reduces the memory space available to 1940 kernel modules from 1.5GB to 1GB.) 1941 1942 Entropy is generated using the RDRAND instruction if it is 1943 supported. If RDTSC is supported, its value is mixed into 1944 the entropy pool as well. If neither RDRAND nor RDTSC are 1945 supported, then entropy is read from the i8254 timer. 1946 1947 Since the kernel is built using 2GB addressing, and 1948 PHYSICAL_ALIGN must be at a minimum of 2MB, only 10 bits of 1949 entropy is theoretically possible. Currently, with the 1950 default value for PHYSICAL_ALIGN and due to page table 1951 layouts, 64-bit uses 9 bits of entropy and 32-bit uses 8 bits. 1952 1953 If CONFIG_HIBERNATE is also enabled, KASLR is disabled at boot 1954 time. To enable it, boot with "kaslr" on the kernel command 1955 line (which will also disable hibernation). 1956 1957 If unsure, say N. 1958 1959# Relocation on x86 needs some additional build support 1960config X86_NEED_RELOCS 1961 def_bool y 1962 depends on RANDOMIZE_BASE || (X86_32 && RELOCATABLE) 1963 1964config PHYSICAL_ALIGN 1965 hex "Alignment value to which kernel should be aligned" 1966 default "0x200000" 1967 range 0x2000 0x1000000 if X86_32 1968 range 0x200000 0x1000000 if X86_64 1969 ---help--- 1970 This value puts the alignment restrictions on physical address 1971 where kernel is loaded and run from. Kernel is compiled for an 1972 address which meets above alignment restriction. 1973 1974 If bootloader loads the kernel at a non-aligned address and 1975 CONFIG_RELOCATABLE is set, kernel will move itself to nearest 1976 address aligned to above value and run from there. 1977 1978 If bootloader loads the kernel at a non-aligned address and 1979 CONFIG_RELOCATABLE is not set, kernel will ignore the run time 1980 load address and decompress itself to the address it has been 1981 compiled for and run from there. The address for which kernel is 1982 compiled already meets above alignment restrictions. Hence the 1983 end result is that kernel runs from a physical address meeting 1984 above alignment restrictions. 1985 1986 On 32-bit this value must be a multiple of 0x2000. On 64-bit 1987 this value must be a multiple of 0x200000. 1988 1989 Don't change this unless you know what you are doing. 1990 1991config HOTPLUG_CPU 1992 bool "Support for hot-pluggable CPUs" 1993 depends on SMP 1994 ---help--- 1995 Say Y here to allow turning CPUs off and on. CPUs can be 1996 controlled through /sys/devices/system/cpu. 1997 ( Note: power management support will enable this option 1998 automatically on SMP systems. ) 1999 Say N if you want to disable CPU hotplug. 2000 2001config BOOTPARAM_HOTPLUG_CPU0 2002 bool "Set default setting of cpu0_hotpluggable" 2003 default n 2004 depends on HOTPLUG_CPU 2005 ---help--- 2006 Set whether default state of cpu0_hotpluggable is on or off. 2007 2008 Say Y here to enable CPU0 hotplug by default. If this switch 2009 is turned on, there is no need to give cpu0_hotplug kernel 2010 parameter and the CPU0 hotplug feature is enabled by default. 2011 2012 Please note: there are two known CPU0 dependencies if you want 2013 to enable the CPU0 hotplug feature either by this switch or by 2014 cpu0_hotplug kernel parameter. 2015 2016 First, resume from hibernate or suspend always starts from CPU0. 2017 So hibernate and suspend are prevented if CPU0 is offline. 2018 2019 Second dependency is PIC interrupts always go to CPU0. CPU0 can not 2020 offline if any interrupt can not migrate out of CPU0. There may 2021 be other CPU0 dependencies. 2022 2023 Please make sure the dependencies are under your control before 2024 you enable this feature. 2025 2026 Say N if you don't want to enable CPU0 hotplug feature by default. 2027 You still can enable the CPU0 hotplug feature at boot by kernel 2028 parameter cpu0_hotplug. 2029 2030config DEBUG_HOTPLUG_CPU0 2031 def_bool n 2032 prompt "Debug CPU0 hotplug" 2033 depends on HOTPLUG_CPU 2034 ---help--- 2035 Enabling this option offlines CPU0 (if CPU0 can be offlined) as 2036 soon as possible and boots up userspace with CPU0 offlined. User 2037 can online CPU0 back after boot time. 2038 2039 To debug CPU0 hotplug, you need to enable CPU0 offline/online 2040 feature by either turning on CONFIG_BOOTPARAM_HOTPLUG_CPU0 during 2041 compilation or giving cpu0_hotplug kernel parameter at boot. 2042 2043 If unsure, say N. 2044 2045config COMPAT_VDSO 2046 def_bool n 2047 prompt "Disable the 32-bit vDSO (needed for glibc 2.3.3)" 2048 depends on X86_32 || IA32_EMULATION 2049 ---help--- 2050 Certain buggy versions of glibc will crash if they are 2051 presented with a 32-bit vDSO that is not mapped at the address 2052 indicated in its segment table. 2053 2054 The bug was introduced by f866314b89d56845f55e6f365e18b31ec978ec3a 2055 and fixed by 3b3ddb4f7db98ec9e912ccdf54d35df4aa30e04a and 2056 49ad572a70b8aeb91e57483a11dd1b77e31c4468. Glibc 2.3.3 is 2057 the only released version with the bug, but OpenSUSE 9 2058 contains a buggy "glibc 2.3.2". 2059 2060 The symptom of the bug is that everything crashes on startup, saying: 2061 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed! 2062 2063 Saying Y here changes the default value of the vdso32 boot 2064 option from 1 to 0, which turns off the 32-bit vDSO entirely. 2065 This works around the glibc bug but hurts performance. 2066 2067 If unsure, say N: if you are compiling your own kernel, you 2068 are unlikely to be using a buggy version of glibc. 2069 2070choice 2071 prompt "vsyscall table for legacy applications" 2072 depends on X86_64 2073 default LEGACY_VSYSCALL_EMULATE 2074 help 2075 Legacy user code that does not know how to find the vDSO expects 2076 to be able to issue three syscalls by calling fixed addresses in 2077 kernel space. Since this location is not randomized with ASLR, 2078 it can be used to assist security vulnerability exploitation. 2079 2080 This setting can be changed at boot time via the kernel command 2081 line parameter vsyscall=[native|emulate|none]. 2082 2083 On a system with recent enough glibc (2.14 or newer) and no 2084 static binaries, you can say None without a performance penalty 2085 to improve security. 2086 2087 If unsure, select "Emulate". 2088 2089 config LEGACY_VSYSCALL_NATIVE 2090 bool "Native" 2091 help 2092 Actual executable code is located in the fixed vsyscall 2093 address mapping, implementing time() efficiently. Since 2094 this makes the mapping executable, it can be used during 2095 security vulnerability exploitation (traditionally as 2096 ROP gadgets). This configuration is not recommended. 2097 2098 config LEGACY_VSYSCALL_EMULATE 2099 bool "Emulate" 2100 help 2101 The kernel traps and emulates calls into the fixed 2102 vsyscall address mapping. This makes the mapping 2103 non-executable, but it still contains known contents, 2104 which could be used in certain rare security vulnerability 2105 exploits. This configuration is recommended when userspace 2106 still uses the vsyscall area. 2107 2108 config LEGACY_VSYSCALL_NONE 2109 bool "None" 2110 help 2111 There will be no vsyscall mapping at all. This will 2112 eliminate any risk of ASLR bypass due to the vsyscall 2113 fixed address mapping. Attempts to use the vsyscalls 2114 will be reported to dmesg, so that either old or 2115 malicious userspace programs can be identified. 2116 2117endchoice 2118 2119config CMDLINE_BOOL 2120 bool "Built-in kernel command line" 2121 ---help--- 2122 Allow for specifying boot arguments to the kernel at 2123 build time. On some systems (e.g. embedded ones), it is 2124 necessary or convenient to provide some or all of the 2125 kernel boot arguments with the kernel itself (that is, 2126 to not rely on the boot loader to provide them.) 2127 2128 To compile command line arguments into the kernel, 2129 set this option to 'Y', then fill in the 2130 boot arguments in CONFIG_CMDLINE. 2131 2132 Systems with fully functional boot loaders (i.e. non-embedded) 2133 should leave this option set to 'N'. 2134 2135config CMDLINE 2136 string "Built-in kernel command string" 2137 depends on CMDLINE_BOOL 2138 default "" 2139 ---help--- 2140 Enter arguments here that should be compiled into the kernel 2141 image and used at boot time. If the boot loader provides a 2142 command line at boot time, it is appended to this string to 2143 form the full kernel command line, when the system boots. 2144 2145 However, you can use the CONFIG_CMDLINE_OVERRIDE option to 2146 change this behavior. 2147 2148 In most cases, the command line (whether built-in or provided 2149 by the boot loader) should specify the device for the root 2150 file system. 2151 2152config CMDLINE_OVERRIDE 2153 bool "Built-in command line overrides boot loader arguments" 2154 depends on CMDLINE_BOOL 2155 ---help--- 2156 Set this option to 'Y' to have the kernel ignore the boot loader 2157 command line, and use ONLY the built-in command line. 2158 2159 This is used to work around broken boot loaders. This should 2160 be set to 'N' under normal conditions. 2161 2162config MODIFY_LDT_SYSCALL 2163 bool "Enable the LDT (local descriptor table)" if EXPERT 2164 default y 2165 ---help--- 2166 Linux can allow user programs to install a per-process x86 2167 Local Descriptor Table (LDT) using the modify_ldt(2) system 2168 call. This is required to run 16-bit or segmented code such as 2169 DOSEMU or some Wine programs. It is also used by some very old 2170 threading libraries. 2171 2172 Enabling this feature adds a small amount of overhead to 2173 context switches and increases the low-level kernel attack 2174 surface. Disabling it removes the modify_ldt(2) system call. 2175 2176 Saying 'N' here may make sense for embedded or server kernels. 2177 2178source "kernel/livepatch/Kconfig" 2179 2180endmenu 2181 2182config ARCH_ENABLE_MEMORY_HOTPLUG 2183 def_bool y 2184 depends on X86_64 || (X86_32 && HIGHMEM) 2185 2186config ARCH_ENABLE_MEMORY_HOTREMOVE 2187 def_bool y 2188 depends on MEMORY_HOTPLUG 2189 2190config USE_PERCPU_NUMA_NODE_ID 2191 def_bool y 2192 depends on NUMA 2193 2194config ARCH_ENABLE_SPLIT_PMD_PTLOCK 2195 def_bool y 2196 depends on X86_64 || X86_PAE 2197 2198config ARCH_ENABLE_HUGEPAGE_MIGRATION 2199 def_bool y 2200 depends on X86_64 && HUGETLB_PAGE && MIGRATION 2201 2202menu "Power management and ACPI options" 2203 2204config ARCH_HIBERNATION_HEADER 2205 def_bool y 2206 depends on X86_64 && HIBERNATION 2207 2208source "kernel/power/Kconfig" 2209 2210source "drivers/acpi/Kconfig" 2211 2212source "drivers/sfi/Kconfig" 2213 2214config X86_APM_BOOT 2215 def_bool y 2216 depends on APM 2217 2218menuconfig APM 2219 tristate "APM (Advanced Power Management) BIOS support" 2220 depends on X86_32 && PM_SLEEP 2221 ---help--- 2222 APM is a BIOS specification for saving power using several different 2223 techniques. This is mostly useful for battery powered laptops with 2224 APM compliant BIOSes. If you say Y here, the system time will be 2225 reset after a RESUME operation, the /proc/apm device will provide 2226 battery status information, and user-space programs will receive 2227 notification of APM "events" (e.g. battery status change). 2228 2229 If you select "Y" here, you can disable actual use of the APM 2230 BIOS by passing the "apm=off" option to the kernel at boot time. 2231 2232 Note that the APM support is almost completely disabled for 2233 machines with more than one CPU. 2234 2235 In order to use APM, you will need supporting software. For location 2236 and more information, read <file:Documentation/power/apm-acpi.txt> 2237 and the Battery Powered Linux mini-HOWTO, available from 2238 <http://www.tldp.org/docs.html#howto>. 2239 2240 This driver does not spin down disk drives (see the hdparm(8) 2241 manpage ("man 8 hdparm") for that), and it doesn't turn off 2242 VESA-compliant "green" monitors. 2243 2244 This driver does not support the TI 4000M TravelMate and the ACER 2245 486/DX4/75 because they don't have compliant BIOSes. Many "green" 2246 desktop machines also don't have compliant BIOSes, and this driver 2247 may cause those machines to panic during the boot phase. 2248 2249 Generally, if you don't have a battery in your machine, there isn't 2250 much point in using this driver and you should say N. If you get 2251 random kernel OOPSes or reboots that don't seem to be related to 2252 anything, try disabling/enabling this option (or disabling/enabling 2253 APM in your BIOS). 2254 2255 Some other things you should try when experiencing seemingly random, 2256 "weird" problems: 2257 2258 1) make sure that you have enough swap space and that it is 2259 enabled. 2260 2) pass the "no-hlt" option to the kernel 2261 3) switch on floating point emulation in the kernel and pass 2262 the "no387" option to the kernel 2263 4) pass the "floppy=nodma" option to the kernel 2264 5) pass the "mem=4M" option to the kernel (thereby disabling 2265 all but the first 4 MB of RAM) 2266 6) make sure that the CPU is not over clocked. 2267 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/> 2268 8) disable the cache from your BIOS settings 2269 9) install a fan for the video card or exchange video RAM 2270 10) install a better fan for the CPU 2271 11) exchange RAM chips 2272 12) exchange the motherboard. 2273 2274 To compile this driver as a module, choose M here: the 2275 module will be called apm. 2276 2277if APM 2278 2279config APM_IGNORE_USER_SUSPEND 2280 bool "Ignore USER SUSPEND" 2281 ---help--- 2282 This option will ignore USER SUSPEND requests. On machines with a 2283 compliant APM BIOS, you want to say N. However, on the NEC Versa M 2284 series notebooks, it is necessary to say Y because of a BIOS bug. 2285 2286config APM_DO_ENABLE 2287 bool "Enable PM at boot time" 2288 ---help--- 2289 Enable APM features at boot time. From page 36 of the APM BIOS 2290 specification: "When disabled, the APM BIOS does not automatically 2291 power manage devices, enter the Standby State, enter the Suspend 2292 State, or take power saving steps in response to CPU Idle calls." 2293 This driver will make CPU Idle calls when Linux is idle (unless this 2294 feature is turned off -- see "Do CPU IDLE calls", below). This 2295 should always save battery power, but more complicated APM features 2296 will be dependent on your BIOS implementation. You may need to turn 2297 this option off if your computer hangs at boot time when using APM 2298 support, or if it beeps continuously instead of suspending. Turn 2299 this off if you have a NEC UltraLite Versa 33/C or a Toshiba 2300 T400CDT. This is off by default since most machines do fine without 2301 this feature. 2302 2303config APM_CPU_IDLE 2304 depends on CPU_IDLE 2305 bool "Make CPU Idle calls when idle" 2306 ---help--- 2307 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop. 2308 On some machines, this can activate improved power savings, such as 2309 a slowed CPU clock rate, when the machine is idle. These idle calls 2310 are made after the idle loop has run for some length of time (e.g., 2311 333 mS). On some machines, this will cause a hang at boot time or 2312 whenever the CPU becomes idle. (On machines with more than one CPU, 2313 this option does nothing.) 2314 2315config APM_DISPLAY_BLANK 2316 bool "Enable console blanking using APM" 2317 ---help--- 2318 Enable console blanking using the APM. Some laptops can use this to 2319 turn off the LCD backlight when the screen blanker of the Linux 2320 virtual console blanks the screen. Note that this is only used by 2321 the virtual console screen blanker, and won't turn off the backlight 2322 when using the X Window system. This also doesn't have anything to 2323 do with your VESA-compliant power-saving monitor. Further, this 2324 option doesn't work for all laptops -- it might not turn off your 2325 backlight at all, or it might print a lot of errors to the console, 2326 especially if you are using gpm. 2327 2328config APM_ALLOW_INTS 2329 bool "Allow interrupts during APM BIOS calls" 2330 ---help--- 2331 Normally we disable external interrupts while we are making calls to 2332 the APM BIOS as a measure to lessen the effects of a badly behaving 2333 BIOS implementation. The BIOS should reenable interrupts if it 2334 needs to. Unfortunately, some BIOSes do not -- especially those in 2335 many of the newer IBM Thinkpads. If you experience hangs when you 2336 suspend, try setting this to Y. Otherwise, say N. 2337 2338endif # APM 2339 2340source "drivers/cpufreq/Kconfig" 2341 2342source "drivers/cpuidle/Kconfig" 2343 2344source "drivers/idle/Kconfig" 2345 2346endmenu 2347 2348 2349menu "Bus options (PCI etc.)" 2350 2351config PCI 2352 bool "PCI support" 2353 default y 2354 ---help--- 2355 Find out whether you have a PCI motherboard. PCI is the name of a 2356 bus system, i.e. the way the CPU talks to the other stuff inside 2357 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or 2358 VESA. If you have PCI, say Y, otherwise N. 2359 2360choice 2361 prompt "PCI access mode" 2362 depends on X86_32 && PCI 2363 default PCI_GOANY 2364 ---help--- 2365 On PCI systems, the BIOS can be used to detect the PCI devices and 2366 determine their configuration. However, some old PCI motherboards 2367 have BIOS bugs and may crash if this is done. Also, some embedded 2368 PCI-based systems don't have any BIOS at all. Linux can also try to 2369 detect the PCI hardware directly without using the BIOS. 2370 2371 With this option, you can specify how Linux should detect the 2372 PCI devices. If you choose "BIOS", the BIOS will be used, 2373 if you choose "Direct", the BIOS won't be used, and if you 2374 choose "MMConfig", then PCI Express MMCONFIG will be used. 2375 If you choose "Any", the kernel will try MMCONFIG, then the 2376 direct access method and falls back to the BIOS if that doesn't 2377 work. If unsure, go with the default, which is "Any". 2378 2379config PCI_GOBIOS 2380 bool "BIOS" 2381 2382config PCI_GOMMCONFIG 2383 bool "MMConfig" 2384 2385config PCI_GODIRECT 2386 bool "Direct" 2387 2388config PCI_GOOLPC 2389 bool "OLPC XO-1" 2390 depends on OLPC 2391 2392config PCI_GOANY 2393 bool "Any" 2394 2395endchoice 2396 2397config PCI_BIOS 2398 def_bool y 2399 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY) 2400 2401# x86-64 doesn't support PCI BIOS access from long mode so always go direct. 2402config PCI_DIRECT 2403 def_bool y 2404 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG)) 2405 2406config PCI_MMCONFIG 2407 def_bool y 2408 depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY) 2409 2410config PCI_OLPC 2411 def_bool y 2412 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY) 2413 2414config PCI_XEN 2415 def_bool y 2416 depends on PCI && XEN 2417 select SWIOTLB_XEN 2418 2419config PCI_DOMAINS 2420 def_bool y 2421 depends on PCI 2422 2423config PCI_MMCONFIG 2424 bool "Support mmconfig PCI config space access" 2425 depends on X86_64 && PCI && ACPI 2426 2427config PCI_CNB20LE_QUIRK 2428 bool "Read CNB20LE Host Bridge Windows" if EXPERT 2429 depends on PCI 2430 help 2431 Read the PCI windows out of the CNB20LE host bridge. This allows 2432 PCI hotplug to work on systems with the CNB20LE chipset which do 2433 not have ACPI. 2434 2435 There's no public spec for this chipset, and this functionality 2436 is known to be incomplete. 2437 2438 You should say N unless you know you need this. 2439 2440source "drivers/pci/Kconfig" 2441 2442config ISA_BUS 2443 bool "ISA-style bus support on modern systems" if EXPERT 2444 select ISA_BUS_API 2445 help 2446 Enables ISA-style drivers on modern systems. This is necessary to 2447 support PC/104 devices on X86_64 platforms. 2448 2449 If unsure, say N. 2450 2451# x86_64 have no ISA slots, but can have ISA-style DMA. 2452config ISA_DMA_API 2453 bool "ISA-style DMA support" if (X86_64 && EXPERT) 2454 default y 2455 help 2456 Enables ISA-style DMA support for devices requiring such controllers. 2457 If unsure, say Y. 2458 2459if X86_32 2460 2461config ISA 2462 bool "ISA support" 2463 ---help--- 2464 Find out whether you have ISA slots on your motherboard. ISA is the 2465 name of a bus system, i.e. the way the CPU talks to the other stuff 2466 inside your box. Other bus systems are PCI, EISA, MicroChannel 2467 (MCA) or VESA. ISA is an older system, now being displaced by PCI; 2468 newer boards don't support it. If you have ISA, say Y, otherwise N. 2469 2470config EISA 2471 bool "EISA support" 2472 depends on ISA 2473 ---help--- 2474 The Extended Industry Standard Architecture (EISA) bus was 2475 developed as an open alternative to the IBM MicroChannel bus. 2476 2477 The EISA bus provided some of the features of the IBM MicroChannel 2478 bus while maintaining backward compatibility with cards made for 2479 the older ISA bus. The EISA bus saw limited use between 1988 and 2480 1995 when it was made obsolete by the PCI bus. 2481 2482 Say Y here if you are building a kernel for an EISA-based machine. 2483 2484 Otherwise, say N. 2485 2486source "drivers/eisa/Kconfig" 2487 2488config SCx200 2489 tristate "NatSemi SCx200 support" 2490 ---help--- 2491 This provides basic support for National Semiconductor's 2492 (now AMD's) Geode processors. The driver probes for the 2493 PCI-IDs of several on-chip devices, so its a good dependency 2494 for other scx200_* drivers. 2495 2496 If compiled as a module, the driver is named scx200. 2497 2498config SCx200HR_TIMER 2499 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support" 2500 depends on SCx200 2501 default y 2502 ---help--- 2503 This driver provides a clocksource built upon the on-chip 2504 27MHz high-resolution timer. Its also a workaround for 2505 NSC Geode SC-1100's buggy TSC, which loses time when the 2506 processor goes idle (as is done by the scheduler). The 2507 other workaround is idle=poll boot option. 2508 2509config OLPC 2510 bool "One Laptop Per Child support" 2511 depends on !X86_PAE 2512 select GPIOLIB 2513 select OF 2514 select OF_PROMTREE 2515 select IRQ_DOMAIN 2516 ---help--- 2517 Add support for detecting the unique features of the OLPC 2518 XO hardware. 2519 2520config OLPC_XO1_PM 2521 bool "OLPC XO-1 Power Management" 2522 depends on OLPC && MFD_CS5535 && PM_SLEEP 2523 select MFD_CORE 2524 ---help--- 2525 Add support for poweroff and suspend of the OLPC XO-1 laptop. 2526 2527config OLPC_XO1_RTC 2528 bool "OLPC XO-1 Real Time Clock" 2529 depends on OLPC_XO1_PM && RTC_DRV_CMOS 2530 ---help--- 2531 Add support for the XO-1 real time clock, which can be used as a 2532 programmable wakeup source. 2533 2534config OLPC_XO1_SCI 2535 bool "OLPC XO-1 SCI extras" 2536 depends on OLPC && OLPC_XO1_PM 2537 depends on INPUT=y 2538 select POWER_SUPPLY 2539 select GPIO_CS5535 2540 select MFD_CORE 2541 ---help--- 2542 Add support for SCI-based features of the OLPC XO-1 laptop: 2543 - EC-driven system wakeups 2544 - Power button 2545 - Ebook switch 2546 - Lid switch 2547 - AC adapter status updates 2548 - Battery status updates 2549 2550config OLPC_XO15_SCI 2551 bool "OLPC XO-1.5 SCI extras" 2552 depends on OLPC && ACPI 2553 select POWER_SUPPLY 2554 ---help--- 2555 Add support for SCI-based features of the OLPC XO-1.5 laptop: 2556 - EC-driven system wakeups 2557 - AC adapter status updates 2558 - Battery status updates 2559 2560config ALIX 2561 bool "PCEngines ALIX System Support (LED setup)" 2562 select GPIOLIB 2563 ---help--- 2564 This option enables system support for the PCEngines ALIX. 2565 At present this just sets up LEDs for GPIO control on 2566 ALIX2/3/6 boards. However, other system specific setup should 2567 get added here. 2568 2569 Note: You must still enable the drivers for GPIO and LED support 2570 (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs 2571 2572 Note: You have to set alix.force=1 for boards with Award BIOS. 2573 2574config NET5501 2575 bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)" 2576 select GPIOLIB 2577 ---help--- 2578 This option enables system support for the Soekris Engineering net5501. 2579 2580config GEOS 2581 bool "Traverse Technologies GEOS System Support (LEDS, GPIO, etc)" 2582 select GPIOLIB 2583 depends on DMI 2584 ---help--- 2585 This option enables system support for the Traverse Technologies GEOS. 2586 2587config TS5500 2588 bool "Technologic Systems TS-5500 platform support" 2589 depends on MELAN 2590 select CHECK_SIGNATURE 2591 select NEW_LEDS 2592 select LEDS_CLASS 2593 ---help--- 2594 This option enables system support for the Technologic Systems TS-5500. 2595 2596endif # X86_32 2597 2598config AMD_NB 2599 def_bool y 2600 depends on CPU_SUP_AMD && PCI 2601 2602source "drivers/pcmcia/Kconfig" 2603 2604config RAPIDIO 2605 tristate "RapidIO support" 2606 depends on PCI 2607 default n 2608 help 2609 If enabled this option will include drivers and the core 2610 infrastructure code to support RapidIO interconnect devices. 2611 2612source "drivers/rapidio/Kconfig" 2613 2614config X86_SYSFB 2615 bool "Mark VGA/VBE/EFI FB as generic system framebuffer" 2616 help 2617 Firmwares often provide initial graphics framebuffers so the BIOS, 2618 bootloader or kernel can show basic video-output during boot for 2619 user-guidance and debugging. Historically, x86 used the VESA BIOS 2620 Extensions and EFI-framebuffers for this, which are mostly limited 2621 to x86. 2622 This option, if enabled, marks VGA/VBE/EFI framebuffers as generic 2623 framebuffers so the new generic system-framebuffer drivers can be 2624 used on x86. If the framebuffer is not compatible with the generic 2625 modes, it is adverticed as fallback platform framebuffer so legacy 2626 drivers like efifb, vesafb and uvesafb can pick it up. 2627 If this option is not selected, all system framebuffers are always 2628 marked as fallback platform framebuffers as usual. 2629 2630 Note: Legacy fbdev drivers, including vesafb, efifb, uvesafb, will 2631 not be able to pick up generic system framebuffers if this option 2632 is selected. You are highly encouraged to enable simplefb as 2633 replacement if you select this option. simplefb can correctly deal 2634 with generic system framebuffers. But you should still keep vesafb 2635 and others enabled as fallback if a system framebuffer is 2636 incompatible with simplefb. 2637 2638 If unsure, say Y. 2639 2640endmenu 2641 2642 2643menu "Executable file formats / Emulations" 2644 2645source "fs/Kconfig.binfmt" 2646 2647config IA32_EMULATION 2648 bool "IA32 Emulation" 2649 depends on X86_64 2650 select BINFMT_ELF 2651 select COMPAT_BINFMT_ELF 2652 select ARCH_WANT_OLD_COMPAT_IPC 2653 ---help--- 2654 Include code to run legacy 32-bit programs under a 2655 64-bit kernel. You should likely turn this on, unless you're 2656 100% sure that you don't have any 32-bit programs left. 2657 2658config IA32_AOUT 2659 tristate "IA32 a.out support" 2660 depends on IA32_EMULATION 2661 ---help--- 2662 Support old a.out binaries in the 32bit emulation. 2663 2664config X86_X32 2665 bool "x32 ABI for 64-bit mode" 2666 depends on X86_64 2667 ---help--- 2668 Include code to run binaries for the x32 native 32-bit ABI 2669 for 64-bit processors. An x32 process gets access to the 2670 full 64-bit register file and wide data path while leaving 2671 pointers at 32 bits for smaller memory footprint. 2672 2673 You will need a recent binutils (2.22 or later) with 2674 elf32_x86_64 support enabled to compile a kernel with this 2675 option set. 2676 2677config COMPAT 2678 def_bool y 2679 depends on IA32_EMULATION || X86_X32 2680 2681if COMPAT 2682config COMPAT_FOR_U64_ALIGNMENT 2683 def_bool y 2684 2685config SYSVIPC_COMPAT 2686 def_bool y 2687 depends on SYSVIPC 2688 2689config KEYS_COMPAT 2690 def_bool y 2691 depends on KEYS 2692endif 2693 2694endmenu 2695 2696 2697config HAVE_ATOMIC_IOMAP 2698 def_bool y 2699 depends on X86_32 2700 2701config X86_DEV_DMA_OPS 2702 bool 2703 depends on X86_64 || STA2X11 2704 2705config X86_DMA_REMAP 2706 bool 2707 depends on STA2X11 2708 2709config PMC_ATOM 2710 def_bool y 2711 depends on PCI 2712 2713config VMD 2714 depends on PCI_MSI 2715 tristate "Volume Management Device Driver" 2716 default N 2717 ---help--- 2718 Adds support for the Intel Volume Management Device (VMD). VMD is a 2719 secondary PCI host bridge that allows PCI Express root ports, 2720 and devices attached to them, to be removed from the default 2721 PCI domain and placed within the VMD domain. This provides 2722 more bus resources than are otherwise possible with a 2723 single domain. If you know your system provides one of these and 2724 has devices attached to it, say Y; if you are not sure, say N. 2725 2726source "net/Kconfig" 2727 2728source "drivers/Kconfig" 2729 2730source "drivers/firmware/Kconfig" 2731 2732source "fs/Kconfig" 2733 2734source "arch/x86/Kconfig.debug" 2735 2736source "security/Kconfig" 2737 2738source "crypto/Kconfig" 2739 2740source "arch/x86/kvm/Kconfig" 2741 2742source "lib/Kconfig" 2743