1config ARM64 2 def_bool y 3 select ARCH_BINFMT_ELF_RANDOMIZE_PIE 4 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE 5 select ARCH_HAS_GCOV_PROFILE_ALL 6 select ARCH_HAS_SG_CHAIN 7 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 8 select ARCH_USE_CMPXCHG_LOCKREF 9 select ARCH_SUPPORTS_ATOMIC_RMW 10 select ARCH_WANT_OPTIONAL_GPIOLIB 11 select ARCH_WANT_COMPAT_IPC_PARSE_VERSION 12 select ARCH_WANT_FRAME_POINTERS 13 select ARM_AMBA 14 select ARM_ARCH_TIMER 15 select ARM_GIC 16 select AUDIT_ARCH_COMPAT_GENERIC 17 select ARM_GIC_V2M if PCI_MSI 18 select ARM_GIC_V3 19 select ARM_GIC_V3_ITS if PCI_MSI 20 select BUILDTIME_EXTABLE_SORT 21 select CLONE_BACKWARDS 22 select COMMON_CLK 23 select CPU_PM if (SUSPEND || CPU_IDLE) 24 select DCACHE_WORD_ACCESS 25 select GENERIC_ALLOCATOR 26 select GENERIC_CLOCKEVENTS 27 select GENERIC_CLOCKEVENTS_BROADCAST if SMP 28 select GENERIC_CPU_AUTOPROBE 29 select GENERIC_EARLY_IOREMAP 30 select GENERIC_IRQ_PROBE 31 select GENERIC_IRQ_SHOW 32 select GENERIC_PCI_IOMAP 33 select GENERIC_SCHED_CLOCK 34 select GENERIC_SMP_IDLE_THREAD 35 select GENERIC_STRNCPY_FROM_USER 36 select GENERIC_STRNLEN_USER 37 select GENERIC_TIME_VSYSCALL 38 select HANDLE_DOMAIN_IRQ 39 select HARDIRQS_SW_RESEND 40 select HAVE_ALIGNED_STRUCT_PAGE if SLUB 41 select HAVE_ARCH_AUDITSYSCALL 42 select HAVE_ARCH_BITREVERSE 43 select HAVE_ARCH_JUMP_LABEL 44 select HAVE_ARCH_KGDB 45 select HAVE_ARCH_SECCOMP_FILTER 46 select HAVE_ARCH_TRACEHOOK 47 select HAVE_BPF_JIT 48 select HAVE_C_RECORDMCOUNT 49 select HAVE_CC_STACKPROTECTOR 50 select HAVE_CMPXCHG_DOUBLE 51 select HAVE_DEBUG_BUGVERBOSE 52 select HAVE_DEBUG_KMEMLEAK 53 select HAVE_DMA_API_DEBUG 54 select HAVE_DMA_ATTRS 55 select HAVE_DMA_CONTIGUOUS 56 select HAVE_DYNAMIC_FTRACE 57 select HAVE_EFFICIENT_UNALIGNED_ACCESS 58 select HAVE_FTRACE_MCOUNT_RECORD 59 select HAVE_FUNCTION_TRACER 60 select HAVE_FUNCTION_GRAPH_TRACER 61 select HAVE_GENERIC_DMA_COHERENT 62 select HAVE_HW_BREAKPOINT if PERF_EVENTS 63 select HAVE_MEMBLOCK 64 select HAVE_PATA_PLATFORM 65 select HAVE_PERF_EVENTS 66 select HAVE_PERF_REGS 67 select HAVE_PERF_USER_STACK_DUMP 68 select HAVE_RCU_TABLE_FREE 69 select HAVE_SYSCALL_TRACEPOINTS 70 select IRQ_DOMAIN 71 select MODULES_USE_ELF_RELA 72 select NO_BOOTMEM 73 select OF 74 select OF_EARLY_FLATTREE 75 select OF_RESERVED_MEM 76 select PERF_USE_VMALLOC 77 select POWER_RESET 78 select POWER_SUPPLY 79 select RTC_LIB 80 select SPARSE_IRQ 81 select SYSCTL_EXCEPTION_TRACE 82 select HAVE_CONTEXT_TRACKING 83 help 84 ARM 64-bit (AArch64) Linux support. 85 86config 64BIT 87 def_bool y 88 89config ARCH_PHYS_ADDR_T_64BIT 90 def_bool y 91 92config MMU 93 def_bool y 94 95config NO_IOPORT_MAP 96 def_bool y if !PCI 97 98config STACKTRACE_SUPPORT 99 def_bool y 100 101config LOCKDEP_SUPPORT 102 def_bool y 103 104config TRACE_IRQFLAGS_SUPPORT 105 def_bool y 106 107config RWSEM_XCHGADD_ALGORITHM 108 def_bool y 109 110config GENERIC_HWEIGHT 111 def_bool y 112 113config GENERIC_CSUM 114 def_bool y 115 116config GENERIC_CALIBRATE_DELAY 117 def_bool y 118 119config ZONE_DMA 120 def_bool y 121 122config HAVE_GENERIC_RCU_GUP 123 def_bool y 124 125config ARCH_DMA_ADDR_T_64BIT 126 def_bool y 127 128config NEED_DMA_MAP_STATE 129 def_bool y 130 131config NEED_SG_DMA_LENGTH 132 def_bool y 133 134config SWIOTLB 135 def_bool y 136 137config IOMMU_HELPER 138 def_bool SWIOTLB 139 140config KERNEL_MODE_NEON 141 def_bool y 142 143config FIX_EARLYCON_MEM 144 def_bool y 145 146source "init/Kconfig" 147 148source "kernel/Kconfig.freezer" 149 150menu "Platform selection" 151 152config ARCH_EXYNOS 153 bool 154 help 155 This enables support for Samsung Exynos SoC family 156 157config ARCH_EXYNOS7 158 bool "ARMv8 based Samsung Exynos7" 159 select ARCH_EXYNOS 160 select COMMON_CLK_SAMSUNG 161 select HAVE_S3C2410_WATCHDOG if WATCHDOG 162 select HAVE_S3C_RTC if RTC_CLASS 163 select PINCTRL 164 select PINCTRL_EXYNOS 165 166 help 167 This enables support for Samsung Exynos7 SoC family 168 169config ARCH_FSL_LS2085A 170 bool "Freescale LS2085A SOC" 171 help 172 This enables support for Freescale LS2085A SOC. 173 174config ARCH_MEDIATEK 175 bool "Mediatek MT65xx & MT81xx ARMv8 SoC" 176 select ARM_GIC 177 help 178 Support for Mediatek MT65xx & MT81xx ARMv8 SoCs 179 180config ARCH_SEATTLE 181 bool "AMD Seattle SoC Family" 182 help 183 This enables support for AMD Seattle SOC Family 184 185config ARCH_TEGRA 186 bool "NVIDIA Tegra SoC Family" 187 select ARCH_HAS_RESET_CONTROLLER 188 select ARCH_REQUIRE_GPIOLIB 189 select CLKDEV_LOOKUP 190 select CLKSRC_MMIO 191 select CLKSRC_OF 192 select GENERIC_CLOCKEVENTS 193 select HAVE_CLK 194 select PINCTRL 195 select RESET_CONTROLLER 196 help 197 This enables support for the NVIDIA Tegra SoC family. 198 199config ARCH_TEGRA_132_SOC 200 bool "NVIDIA Tegra132 SoC" 201 depends on ARCH_TEGRA 202 select PINCTRL_TEGRA124 203 select USB_ULPI if USB_PHY 204 select USB_ULPI_VIEWPORT if USB_PHY 205 help 206 Enable support for NVIDIA Tegra132 SoC, based on the Denver 207 ARMv8 CPU. The Tegra132 SoC is similar to the Tegra124 SoC, 208 but contains an NVIDIA Denver CPU complex in place of 209 Tegra124's "4+1" Cortex-A15 CPU complex. 210 211config ARCH_THUNDER 212 bool "Cavium Inc. Thunder SoC Family" 213 help 214 This enables support for Cavium's Thunder Family of SoCs. 215 216config ARCH_VEXPRESS 217 bool "ARMv8 software model (Versatile Express)" 218 select ARCH_REQUIRE_GPIOLIB 219 select COMMON_CLK_VERSATILE 220 select POWER_RESET_VEXPRESS 221 select VEXPRESS_CONFIG 222 help 223 This enables support for the ARMv8 software model (Versatile 224 Express). 225 226config ARCH_XGENE 227 bool "AppliedMicro X-Gene SOC Family" 228 help 229 This enables support for AppliedMicro X-Gene SOC Family 230 231endmenu 232 233menu "Bus support" 234 235config PCI 236 bool "PCI support" 237 help 238 This feature enables support for PCI bus system. If you say Y 239 here, the kernel will include drivers and infrastructure code 240 to support PCI bus devices. 241 242config PCI_DOMAINS 243 def_bool PCI 244 245config PCI_DOMAINS_GENERIC 246 def_bool PCI 247 248config PCI_SYSCALL 249 def_bool PCI 250 251source "drivers/pci/Kconfig" 252source "drivers/pci/pcie/Kconfig" 253source "drivers/pci/hotplug/Kconfig" 254 255endmenu 256 257menu "Kernel Features" 258 259menu "ARM errata workarounds via the alternatives framework" 260 261config ARM64_ERRATUM_826319 262 bool "Cortex-A53: 826319: System might deadlock if a write cannot complete until read data is accepted" 263 default y 264 help 265 This option adds an alternative code sequence to work around ARM 266 erratum 826319 on Cortex-A53 parts up to r0p2 with an AMBA 4 ACE or 267 AXI master interface and an L2 cache. 268 269 If a Cortex-A53 uses an AMBA AXI4 ACE interface to other processors 270 and is unable to accept a certain write via this interface, it will 271 not progress on read data presented on the read data channel and the 272 system can deadlock. 273 274 The workaround promotes data cache clean instructions to 275 data cache clean-and-invalidate. 276 Please note that this does not necessarily enable the workaround, 277 as it depends on the alternative framework, which will only patch 278 the kernel if an affected CPU is detected. 279 280 If unsure, say Y. 281 282config ARM64_ERRATUM_827319 283 bool "Cortex-A53: 827319: Data cache clean instructions might cause overlapping transactions to the interconnect" 284 default y 285 help 286 This option adds an alternative code sequence to work around ARM 287 erratum 827319 on Cortex-A53 parts up to r0p2 with an AMBA 5 CHI 288 master interface and an L2 cache. 289 290 Under certain conditions this erratum can cause a clean line eviction 291 to occur at the same time as another transaction to the same address 292 on the AMBA 5 CHI interface, which can cause data corruption if the 293 interconnect reorders the two transactions. 294 295 The workaround promotes data cache clean instructions to 296 data cache clean-and-invalidate. 297 Please note that this does not necessarily enable the workaround, 298 as it depends on the alternative framework, which will only patch 299 the kernel if an affected CPU is detected. 300 301 If unsure, say Y. 302 303config ARM64_ERRATUM_824069 304 bool "Cortex-A53: 824069: Cache line might not be marked as clean after a CleanShared snoop" 305 default y 306 help 307 This option adds an alternative code sequence to work around ARM 308 erratum 824069 on Cortex-A53 parts up to r0p2 when it is connected 309 to a coherent interconnect. 310 311 If a Cortex-A53 processor is executing a store or prefetch for 312 write instruction at the same time as a processor in another 313 cluster is executing a cache maintenance operation to the same 314 address, then this erratum might cause a clean cache line to be 315 incorrectly marked as dirty. 316 317 The workaround promotes data cache clean instructions to 318 data cache clean-and-invalidate. 319 Please note that this option does not necessarily enable the 320 workaround, as it depends on the alternative framework, which will 321 only patch the kernel if an affected CPU is detected. 322 323 If unsure, say Y. 324 325config ARM64_ERRATUM_819472 326 bool "Cortex-A53: 819472: Store exclusive instructions might cause data corruption" 327 default y 328 help 329 This option adds an alternative code sequence to work around ARM 330 erratum 819472 on Cortex-A53 parts up to r0p1 with an L2 cache 331 present when it is connected to a coherent interconnect. 332 333 If the processor is executing a load and store exclusive sequence at 334 the same time as a processor in another cluster is executing a cache 335 maintenance operation to the same address, then this erratum might 336 cause data corruption. 337 338 The workaround promotes data cache clean instructions to 339 data cache clean-and-invalidate. 340 Please note that this does not necessarily enable the workaround, 341 as it depends on the alternative framework, which will only patch 342 the kernel if an affected CPU is detected. 343 344 If unsure, say Y. 345 346config ARM64_ERRATUM_832075 347 bool "Cortex-A57: 832075: possible deadlock on mixing exclusive memory accesses with device loads" 348 default y 349 help 350 This option adds an alternative code sequence to work around ARM 351 erratum 832075 on Cortex-A57 parts up to r1p2. 352 353 Affected Cortex-A57 parts might deadlock when exclusive load/store 354 instructions to Write-Back memory are mixed with Device loads. 355 356 The workaround is to promote device loads to use Load-Acquire 357 semantics. 358 Please note that this does not necessarily enable the workaround, 359 as it depends on the alternative framework, which will only patch 360 the kernel if an affected CPU is detected. 361 362 If unsure, say Y. 363 364endmenu 365 366 367choice 368 prompt "Page size" 369 default ARM64_4K_PAGES 370 help 371 Page size (translation granule) configuration. 372 373config ARM64_4K_PAGES 374 bool "4KB" 375 help 376 This feature enables 4KB pages support. 377 378config ARM64_64K_PAGES 379 bool "64KB" 380 help 381 This feature enables 64KB pages support (4KB by default) 382 allowing only two levels of page tables and faster TLB 383 look-up. AArch32 emulation is not available when this feature 384 is enabled. 385 386endchoice 387 388choice 389 prompt "Virtual address space size" 390 default ARM64_VA_BITS_39 if ARM64_4K_PAGES 391 default ARM64_VA_BITS_42 if ARM64_64K_PAGES 392 help 393 Allows choosing one of multiple possible virtual address 394 space sizes. The level of translation table is determined by 395 a combination of page size and virtual address space size. 396 397config ARM64_VA_BITS_39 398 bool "39-bit" 399 depends on ARM64_4K_PAGES 400 401config ARM64_VA_BITS_42 402 bool "42-bit" 403 depends on ARM64_64K_PAGES 404 405config ARM64_VA_BITS_48 406 bool "48-bit" 407 408endchoice 409 410config ARM64_VA_BITS 411 int 412 default 39 if ARM64_VA_BITS_39 413 default 42 if ARM64_VA_BITS_42 414 default 48 if ARM64_VA_BITS_48 415 416config ARM64_PGTABLE_LEVELS 417 int 418 default 2 if ARM64_64K_PAGES && ARM64_VA_BITS_42 419 default 3 if ARM64_64K_PAGES && ARM64_VA_BITS_48 420 default 3 if ARM64_4K_PAGES && ARM64_VA_BITS_39 421 default 4 if ARM64_4K_PAGES && ARM64_VA_BITS_48 422 423config CPU_BIG_ENDIAN 424 bool "Build big-endian kernel" 425 help 426 Say Y if you plan on running a kernel in big-endian mode. 427 428config SMP 429 bool "Symmetric Multi-Processing" 430 help 431 This enables support for systems with more than one CPU. If 432 you say N here, the kernel will run on single and 433 multiprocessor machines, but will use only one CPU of a 434 multiprocessor machine. If you say Y here, the kernel will run 435 on many, but not all, single processor machines. On a single 436 processor machine, the kernel will run faster if you say N 437 here. 438 439 If you don't know what to do here, say N. 440 441config SCHED_MC 442 bool "Multi-core scheduler support" 443 depends on SMP 444 help 445 Multi-core scheduler support improves the CPU scheduler's decision 446 making when dealing with multi-core CPU chips at a cost of slightly 447 increased overhead in some places. If unsure say N here. 448 449config SCHED_SMT 450 bool "SMT scheduler support" 451 depends on SMP 452 help 453 Improves the CPU scheduler's decision making when dealing with 454 MultiThreading at a cost of slightly increased overhead in some 455 places. If unsure say N here. 456 457config NR_CPUS 458 int "Maximum number of CPUs (2-64)" 459 range 2 64 460 depends on SMP 461 # These have to remain sorted largest to smallest 462 default "64" 463 464config HOTPLUG_CPU 465 bool "Support for hot-pluggable CPUs" 466 depends on SMP 467 help 468 Say Y here to experiment with turning CPUs off and on. CPUs 469 can be controlled through /sys/devices/system/cpu. 470 471source kernel/Kconfig.preempt 472 473config HZ 474 int 475 default 100 476 477config ARCH_HAS_HOLES_MEMORYMODEL 478 def_bool y if SPARSEMEM 479 480config ARCH_SPARSEMEM_ENABLE 481 def_bool y 482 select SPARSEMEM_VMEMMAP_ENABLE 483 484config ARCH_SPARSEMEM_DEFAULT 485 def_bool ARCH_SPARSEMEM_ENABLE 486 487config ARCH_SELECT_MEMORY_MODEL 488 def_bool ARCH_SPARSEMEM_ENABLE 489 490config HAVE_ARCH_PFN_VALID 491 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM 492 493config HW_PERF_EVENTS 494 bool "Enable hardware performance counter support for perf events" 495 depends on PERF_EVENTS 496 default y 497 help 498 Enable hardware performance counter support for perf events. If 499 disabled, perf events will use software events only. 500 501config SYS_SUPPORTS_HUGETLBFS 502 def_bool y 503 504config ARCH_WANT_GENERAL_HUGETLB 505 def_bool y 506 507config ARCH_WANT_HUGE_PMD_SHARE 508 def_bool y if !ARM64_64K_PAGES 509 510config HAVE_ARCH_TRANSPARENT_HUGEPAGE 511 def_bool y 512 513config ARCH_HAS_CACHE_LINE_SIZE 514 def_bool y 515 516source "mm/Kconfig" 517 518config SECCOMP 519 bool "Enable seccomp to safely compute untrusted bytecode" 520 ---help--- 521 This kernel feature is useful for number crunching applications 522 that may need to compute untrusted bytecode during their 523 execution. By using pipes or other transports made available to 524 the process as file descriptors supporting the read/write 525 syscalls, it's possible to isolate those applications in 526 their own address space using seccomp. Once seccomp is 527 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled 528 and the task is only allowed to execute a few safe syscalls 529 defined by each seccomp mode. 530 531config XEN_DOM0 532 def_bool y 533 depends on XEN 534 535config XEN 536 bool "Xen guest support on ARM64" 537 depends on ARM64 && OF 538 select SWIOTLB_XEN 539 help 540 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64. 541 542config FORCE_MAX_ZONEORDER 543 int 544 default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE) 545 default "11" 546 547menuconfig ARMV8_DEPRECATED 548 bool "Emulate deprecated/obsolete ARMv8 instructions" 549 depends on COMPAT 550 help 551 Legacy software support may require certain instructions 552 that have been deprecated or obsoleted in the architecture. 553 554 Enable this config to enable selective emulation of these 555 features. 556 557 If unsure, say Y 558 559if ARMV8_DEPRECATED 560 561config SWP_EMULATION 562 bool "Emulate SWP/SWPB instructions" 563 help 564 ARMv8 obsoletes the use of A32 SWP/SWPB instructions such that 565 they are always undefined. Say Y here to enable software 566 emulation of these instructions for userspace using LDXR/STXR. 567 568 In some older versions of glibc [<=2.8] SWP is used during futex 569 trylock() operations with the assumption that the code will not 570 be preempted. This invalid assumption may be more likely to fail 571 with SWP emulation enabled, leading to deadlock of the user 572 application. 573 574 NOTE: when accessing uncached shared regions, LDXR/STXR rely 575 on an external transaction monitoring block called a global 576 monitor to maintain update atomicity. If your system does not 577 implement a global monitor, this option can cause programs that 578 perform SWP operations to uncached memory to deadlock. 579 580 If unsure, say Y 581 582config CP15_BARRIER_EMULATION 583 bool "Emulate CP15 Barrier instructions" 584 help 585 The CP15 barrier instructions - CP15ISB, CP15DSB, and 586 CP15DMB - are deprecated in ARMv8 (and ARMv7). It is 587 strongly recommended to use the ISB, DSB, and DMB 588 instructions instead. 589 590 Say Y here to enable software emulation of these 591 instructions for AArch32 userspace code. When this option is 592 enabled, CP15 barrier usage is traced which can help 593 identify software that needs updating. 594 595 If unsure, say Y 596 597config SETEND_EMULATION 598 bool "Emulate SETEND instruction" 599 help 600 The SETEND instruction alters the data-endianness of the 601 AArch32 EL0, and is deprecated in ARMv8. 602 603 Say Y here to enable software emulation of the instruction 604 for AArch32 userspace code. 605 606 Note: All the cpus on the system must have mixed endian support at EL0 607 for this feature to be enabled. If a new CPU - which doesn't support mixed 608 endian - is hotplugged in after this feature has been enabled, there could 609 be unexpected results in the applications. 610 611 If unsure, say Y 612endif 613 614endmenu 615 616menu "Boot options" 617 618config CMDLINE 619 string "Default kernel command string" 620 default "" 621 help 622 Provide a set of default command-line options at build time by 623 entering them here. As a minimum, you should specify the the 624 root device (e.g. root=/dev/nfs). 625 626config CMDLINE_FORCE 627 bool "Always use the default kernel command string" 628 help 629 Always use the default kernel command string, even if the boot 630 loader passes other arguments to the kernel. 631 This is useful if you cannot or don't want to change the 632 command-line options your boot loader passes to the kernel. 633 634config EFI_STUB 635 bool 636 637config EFI 638 bool "UEFI runtime support" 639 depends on OF && !CPU_BIG_ENDIAN 640 select LIBFDT 641 select UCS2_STRING 642 select EFI_PARAMS_FROM_FDT 643 select EFI_RUNTIME_WRAPPERS 644 select EFI_STUB 645 select EFI_ARMSTUB 646 default y 647 help 648 This option provides support for runtime services provided 649 by UEFI firmware (such as non-volatile variables, realtime 650 clock, and platform reset). A UEFI stub is also provided to 651 allow the kernel to be booted as an EFI application. This 652 is only useful on systems that have UEFI firmware. 653 654config DMI 655 bool "Enable support for SMBIOS (DMI) tables" 656 depends on EFI 657 default y 658 help 659 This enables SMBIOS/DMI feature for systems. 660 661 This option is only useful on systems that have UEFI firmware. 662 However, even with this option, the resultant kernel should 663 continue to boot on existing non-UEFI platforms. 664 665endmenu 666 667menu "Userspace binary formats" 668 669source "fs/Kconfig.binfmt" 670 671config COMPAT 672 bool "Kernel support for 32-bit EL0" 673 depends on !ARM64_64K_PAGES 674 select COMPAT_BINFMT_ELF 675 select HAVE_UID16 676 select OLD_SIGSUSPEND3 677 select COMPAT_OLD_SIGACTION 678 help 679 This option enables support for a 32-bit EL0 running under a 64-bit 680 kernel at EL1. AArch32-specific components such as system calls, 681 the user helper functions, VFP support and the ptrace interface are 682 handled appropriately by the kernel. 683 684 If you want to execute 32-bit userspace applications, say Y. 685 686config SYSVIPC_COMPAT 687 def_bool y 688 depends on COMPAT && SYSVIPC 689 690endmenu 691 692menu "Power management options" 693 694source "kernel/power/Kconfig" 695 696config ARCH_SUSPEND_POSSIBLE 697 def_bool y 698 699endmenu 700 701menu "CPU Power Management" 702 703source "drivers/cpuidle/Kconfig" 704 705source "drivers/cpufreq/Kconfig" 706 707endmenu 708 709source "net/Kconfig" 710 711source "drivers/Kconfig" 712 713source "drivers/firmware/Kconfig" 714 715source "fs/Kconfig" 716 717source "arch/arm64/kvm/Kconfig" 718 719source "arch/arm64/Kconfig.debug" 720 721source "security/Kconfig" 722 723source "crypto/Kconfig" 724if CRYPTO 725source "arch/arm64/crypto/Kconfig" 726endif 727 728source "lib/Kconfig" 729