1# SPDX-License-Identifier: GPL-2.0 2config ARM 3 bool 4 default y 5 select ARCH_32BIT_OFF_T 6 select ARCH_CORRECT_STACKTRACE_ON_KRETPROBE if HAVE_KRETPROBES && FRAME_POINTER && !ARM_UNWIND 7 select ARCH_HAS_BINFMT_FLAT 8 select ARCH_HAS_CURRENT_STACK_POINTER 9 select ARCH_HAS_DEBUG_VIRTUAL if MMU 10 select ARCH_HAS_DMA_WRITE_COMBINE if !ARM_DMA_MEM_BUFFERABLE 11 select ARCH_HAS_ELF_RANDOMIZE 12 select ARCH_HAS_FORTIFY_SOURCE 13 select ARCH_HAS_KEEPINITRD 14 select ARCH_HAS_KCOV 15 select ARCH_HAS_MEMBARRIER_SYNC_CORE 16 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE 17 select ARCH_HAS_PTE_SPECIAL if ARM_LPAE 18 select ARCH_HAS_SETUP_DMA_OPS 19 select ARCH_HAS_SET_MEMORY 20 select ARCH_STACKWALK 21 select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL 22 select ARCH_HAS_STRICT_MODULE_RWX if MMU 23 select ARCH_HAS_SYNC_DMA_FOR_DEVICE 24 select ARCH_HAS_SYNC_DMA_FOR_CPU 25 select ARCH_HAS_TEARDOWN_DMA_OPS if MMU 26 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 27 select ARCH_HAVE_NMI_SAFE_CMPXCHG if CPU_V7 || CPU_V7M || CPU_V6K 28 select ARCH_HAS_GCOV_PROFILE_ALL 29 select ARCH_KEEP_MEMBLOCK 30 select ARCH_HAS_UBSAN_SANITIZE_ALL 31 select ARCH_MIGHT_HAVE_PC_PARPORT 32 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX 33 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT if CPU_V7 34 select ARCH_SUPPORTS_ATOMIC_RMW 35 select ARCH_SUPPORTS_HUGETLBFS if ARM_LPAE 36 select ARCH_USE_BUILTIN_BSWAP 37 select ARCH_USE_CMPXCHG_LOCKREF 38 select ARCH_USE_MEMTEST 39 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU 40 select ARCH_WANT_GENERAL_HUGETLB 41 select ARCH_WANT_IPC_PARSE_VERSION 42 select ARCH_WANT_LD_ORPHAN_WARN 43 select BINFMT_FLAT_ARGVP_ENVP_ON_STACK 44 select BUILDTIME_TABLE_SORT if MMU 45 select COMMON_CLK if !(ARCH_RPC || ARCH_FOOTBRIDGE) 46 select CLONE_BACKWARDS 47 select CPU_PM if SUSPEND || CPU_IDLE 48 select DCACHE_WORD_ACCESS if HAVE_EFFICIENT_UNALIGNED_ACCESS 49 select DMA_DECLARE_COHERENT 50 select DMA_GLOBAL_POOL if !MMU 51 select DMA_OPS 52 select DMA_NONCOHERENT_MMAP if MMU 53 select EDAC_SUPPORT 54 select EDAC_ATOMIC_SCRUB 55 select GENERIC_ALLOCATOR 56 select GENERIC_ARCH_TOPOLOGY if ARM_CPU_TOPOLOGY 57 select GENERIC_ATOMIC64 if CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI 58 select GENERIC_CLOCKEVENTS_BROADCAST if SMP 59 select GENERIC_IRQ_IPI if SMP 60 select GENERIC_CPU_AUTOPROBE 61 select GENERIC_EARLY_IOREMAP 62 select GENERIC_IDLE_POLL_SETUP 63 select GENERIC_IRQ_MULTI_HANDLER 64 select GENERIC_IRQ_PROBE 65 select GENERIC_IRQ_SHOW 66 select GENERIC_IRQ_SHOW_LEVEL 67 select GENERIC_LIB_DEVMEM_IS_ALLOWED 68 select GENERIC_PCI_IOMAP 69 select GENERIC_SCHED_CLOCK 70 select GENERIC_SMP_IDLE_THREAD 71 select HARDIRQS_SW_RESEND 72 select HAS_IOPORT 73 select HAVE_ARCH_AUDITSYSCALL if AEABI && !OABI_COMPAT 74 select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6 75 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32 && MMU 76 select HAVE_ARCH_KFENCE if MMU && !XIP_KERNEL 77 select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32 && MMU 78 select HAVE_ARCH_KASAN if MMU && !XIP_KERNEL 79 select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN 80 select HAVE_ARCH_MMAP_RND_BITS if MMU 81 select HAVE_ARCH_PFN_VALID 82 select HAVE_ARCH_SECCOMP 83 select HAVE_ARCH_SECCOMP_FILTER if AEABI && !OABI_COMPAT 84 select HAVE_ARCH_THREAD_STRUCT_WHITELIST 85 select HAVE_ARCH_TRACEHOOK 86 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if ARM_LPAE 87 select HAVE_ARM_SMCCC if CPU_V7 88 select HAVE_EBPF_JIT if !CPU_ENDIAN_BE32 89 select HAVE_CONTEXT_TRACKING_USER 90 select HAVE_C_RECORDMCOUNT 91 select HAVE_BUILDTIME_MCOUNT_SORT 92 select HAVE_DEBUG_KMEMLEAK if !XIP_KERNEL 93 select HAVE_DMA_CONTIGUOUS if MMU 94 select HAVE_DYNAMIC_FTRACE if !XIP_KERNEL && !CPU_ENDIAN_BE32 && MMU 95 select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE 96 select HAVE_EFFICIENT_UNALIGNED_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && MMU 97 select HAVE_EXIT_THREAD 98 select HAVE_FAST_GUP if ARM_LPAE 99 select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL 100 select HAVE_FUNCTION_ERROR_INJECTION 101 select HAVE_FUNCTION_GRAPH_TRACER 102 select HAVE_FUNCTION_TRACER if !XIP_KERNEL 103 select HAVE_GCC_PLUGINS 104 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7) 105 select HAVE_IRQ_TIME_ACCOUNTING 106 select HAVE_KERNEL_GZIP 107 select HAVE_KERNEL_LZ4 108 select HAVE_KERNEL_LZMA 109 select HAVE_KERNEL_LZO 110 select HAVE_KERNEL_XZ 111 select HAVE_KPROBES if !XIP_KERNEL && !CPU_ENDIAN_BE32 && !CPU_V7M 112 select HAVE_KRETPROBES if HAVE_KPROBES 113 select HAVE_MOD_ARCH_SPECIFIC 114 select HAVE_NMI 115 select HAVE_OPTPROBES if !THUMB2_KERNEL 116 select HAVE_PCI if MMU 117 select HAVE_PERF_EVENTS 118 select HAVE_PERF_REGS 119 select HAVE_PERF_USER_STACK_DUMP 120 select MMU_GATHER_RCU_TABLE_FREE if SMP && ARM_LPAE 121 select HAVE_REGS_AND_STACK_ACCESS_API 122 select HAVE_RSEQ 123 select HAVE_STACKPROTECTOR 124 select HAVE_SYSCALL_TRACEPOINTS 125 select HAVE_UID16 126 select HAVE_VIRT_CPU_ACCOUNTING_GEN 127 select IRQ_FORCED_THREADING 128 select MODULES_USE_ELF_REL 129 select NEED_DMA_MAP_STATE 130 select OF_EARLY_FLATTREE if OF 131 select OLD_SIGACTION 132 select OLD_SIGSUSPEND3 133 select PCI_DOMAINS_GENERIC if PCI 134 select PCI_SYSCALL if PCI 135 select PERF_USE_VMALLOC 136 select RTC_LIB 137 select SPARSE_IRQ if !(ARCH_FOOTBRIDGE || ARCH_RPC) 138 select SYS_SUPPORTS_APM_EMULATION 139 select THREAD_INFO_IN_TASK 140 select TIMER_OF if OF 141 select HAVE_ARCH_VMAP_STACK if MMU && ARM_HAS_GROUP_RELOCS 142 select TRACE_IRQFLAGS_SUPPORT if !CPU_V7M 143 select USE_OF if !(ARCH_FOOTBRIDGE || ARCH_RPC || ARCH_SA1100) 144 # Above selects are sorted alphabetically; please add new ones 145 # according to that. Thanks. 146 help 147 The ARM series is a line of low-power-consumption RISC chip designs 148 licensed by ARM Ltd and targeted at embedded applications and 149 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer 150 manufactured, but legacy ARM-based PC hardware remains popular in 151 Europe. There is an ARM Linux project with a web page at 152 <http://www.arm.linux.org.uk/>. 153 154config ARM_HAS_GROUP_RELOCS 155 def_bool y 156 depends on !LD_IS_LLD || LLD_VERSION >= 140000 157 depends on !COMPILE_TEST 158 help 159 Whether or not to use R_ARM_ALU_PC_Gn or R_ARM_LDR_PC_Gn group 160 relocations, which have been around for a long time, but were not 161 supported in LLD until version 14. The combined range is -/+ 256 MiB, 162 which is usually sufficient, but not for allyesconfig, so we disable 163 this feature when doing compile testing. 164 165config ARM_DMA_USE_IOMMU 166 bool 167 select NEED_SG_DMA_LENGTH 168 169if ARM_DMA_USE_IOMMU 170 171config ARM_DMA_IOMMU_ALIGNMENT 172 int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers" 173 range 4 9 174 default 8 175 help 176 DMA mapping framework by default aligns all buffers to the smallest 177 PAGE_SIZE order which is greater than or equal to the requested buffer 178 size. This works well for buffers up to a few hundreds kilobytes, but 179 for larger buffers it just a waste of address space. Drivers which has 180 relatively small addressing window (like 64Mib) might run out of 181 virtual space with just a few allocations. 182 183 With this parameter you can specify the maximum PAGE_SIZE order for 184 DMA IOMMU buffers. Larger buffers will be aligned only to this 185 specified order. The order is expressed as a power of two multiplied 186 by the PAGE_SIZE. 187 188endif 189 190config SYS_SUPPORTS_APM_EMULATION 191 bool 192 193config HAVE_TCM 194 bool 195 select GENERIC_ALLOCATOR 196 197config HAVE_PROC_CPU 198 bool 199 200config NO_IOPORT_MAP 201 bool 202 203config SBUS 204 bool 205 206config STACKTRACE_SUPPORT 207 bool 208 default y 209 210config LOCKDEP_SUPPORT 211 bool 212 default y 213 214config ARCH_HAS_ILOG2_U32 215 bool 216 217config ARCH_HAS_ILOG2_U64 218 bool 219 220config ARCH_HAS_BANDGAP 221 bool 222 223config FIX_EARLYCON_MEM 224 def_bool y if MMU 225 226config GENERIC_HWEIGHT 227 bool 228 default y 229 230config GENERIC_CALIBRATE_DELAY 231 bool 232 default y 233 234config ARCH_MAY_HAVE_PC_FDC 235 bool 236 237config ARCH_SUPPORTS_UPROBES 238 def_bool y 239 240config GENERIC_ISA_DMA 241 bool 242 243config FIQ 244 bool 245 246config ARCH_MTD_XIP 247 bool 248 249config ARM_PATCH_PHYS_VIRT 250 bool "Patch physical to virtual translations at runtime" if EMBEDDED 251 default y 252 depends on MMU 253 help 254 Patch phys-to-virt and virt-to-phys translation functions at 255 boot and module load time according to the position of the 256 kernel in system memory. 257 258 This can only be used with non-XIP MMU kernels where the base 259 of physical memory is at a 2 MiB boundary. 260 261 Only disable this option if you know that you do not require 262 this feature (eg, building a kernel for a single machine) and 263 you need to shrink the kernel to the minimal size. 264 265config NEED_MACH_IO_H 266 bool 267 help 268 Select this when mach/io.h is required to provide special 269 definitions for this platform. The need for mach/io.h should 270 be avoided when possible. 271 272config NEED_MACH_MEMORY_H 273 bool 274 help 275 Select this when mach/memory.h is required to provide special 276 definitions for this platform. The need for mach/memory.h should 277 be avoided when possible. 278 279config PHYS_OFFSET 280 hex "Physical address of main memory" if MMU 281 depends on !ARM_PATCH_PHYS_VIRT || !AUTO_ZRELADDR 282 default DRAM_BASE if !MMU 283 default 0x00000000 if ARCH_FOOTBRIDGE 284 default 0x10000000 if ARCH_OMAP1 || ARCH_RPC 285 default 0xa0000000 if ARCH_PXA 286 default 0xc0000000 if ARCH_EP93XX || ARCH_SA1100 287 default 0 288 help 289 Please provide the physical address corresponding to the 290 location of main memory in your system. 291 292config GENERIC_BUG 293 def_bool y 294 depends on BUG 295 296config PGTABLE_LEVELS 297 int 298 default 3 if ARM_LPAE 299 default 2 300 301menu "System Type" 302 303config MMU 304 bool "MMU-based Paged Memory Management Support" 305 default y 306 help 307 Select if you want MMU-based virtualised addressing space 308 support by paged memory management. If unsure, say 'Y'. 309 310config ARM_SINGLE_ARMV7M 311 def_bool !MMU 312 select ARM_NVIC 313 select CPU_V7M 314 select NO_IOPORT_MAP 315 316config ARCH_MMAP_RND_BITS_MIN 317 default 8 318 319config ARCH_MMAP_RND_BITS_MAX 320 default 14 if PAGE_OFFSET=0x40000000 321 default 15 if PAGE_OFFSET=0x80000000 322 default 16 323 324config ARCH_MULTIPLATFORM 325 bool "Require kernel to be portable to multiple machines" if EXPERT 326 depends on MMU && !(ARCH_FOOTBRIDGE || ARCH_RPC || ARCH_SA1100) 327 default y 328 help 329 In general, all Arm machines can be supported in a single 330 kernel image, covering either Armv4/v5 or Armv6/v7. 331 332 However, some configuration options require hardcoding machine 333 specific physical addresses or enable errata workarounds that may 334 break other machines. 335 336 Selecting N here allows using those options, including 337 DEBUG_UNCOMPRESS, XIP_KERNEL and ZBOOT_ROM. If unsure, say Y. 338 339menu "Platform selection" 340 depends on MMU 341 342comment "CPU Core family selection" 343 344config ARCH_MULTI_V4 345 bool "ARMv4 based platforms (FA526, StrongARM)" 346 depends on !ARCH_MULTI_V6_V7 347 # https://github.com/llvm/llvm-project/issues/50764 348 depends on !LD_IS_LLD || LLD_VERSION >= 160000 349 select ARCH_MULTI_V4_V5 350 select CPU_FA526 if !(CPU_SA110 || CPU_SA1100) 351 352config ARCH_MULTI_V4T 353 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)" 354 depends on !ARCH_MULTI_V6_V7 355 # https://github.com/llvm/llvm-project/issues/50764 356 depends on !LD_IS_LLD || LLD_VERSION >= 160000 357 select ARCH_MULTI_V4_V5 358 select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \ 359 CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \ 360 CPU_ARM925T || CPU_ARM940T) 361 362config ARCH_MULTI_V5 363 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)" 364 depends on !ARCH_MULTI_V6_V7 365 select ARCH_MULTI_V4_V5 366 select CPU_ARM926T if !(CPU_ARM946E || CPU_ARM1020 || \ 367 CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \ 368 CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON) 369 370config ARCH_MULTI_V4_V5 371 bool 372 373config ARCH_MULTI_V6 374 bool "ARMv6 based platforms (ARM11)" 375 select ARCH_MULTI_V6_V7 376 select CPU_V6K 377 378config ARCH_MULTI_V7 379 bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)" 380 default y 381 select ARCH_MULTI_V6_V7 382 select CPU_V7 383 select HAVE_SMP 384 385config ARCH_MULTI_V6_V7 386 bool 387 select MIGHT_HAVE_CACHE_L2X0 388 389config ARCH_MULTI_CPU_AUTO 390 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7) 391 select ARCH_MULTI_V5 392 393endmenu 394 395config ARCH_VIRT 396 bool "Dummy Virtual Machine" 397 depends on ARCH_MULTI_V7 398 select ARM_AMBA 399 select ARM_GIC 400 select ARM_GIC_V2M if PCI 401 select ARM_GIC_V3 402 select ARM_GIC_V3_ITS if PCI 403 select ARM_PSCI 404 select HAVE_ARM_ARCH_TIMER 405 406config ARCH_AIROHA 407 bool "Airoha SoC Support" 408 depends on ARCH_MULTI_V7 409 select ARM_AMBA 410 select ARM_GIC 411 select ARM_GIC_V3 412 select ARM_PSCI 413 select HAVE_ARM_ARCH_TIMER 414 help 415 Support for Airoha EN7523 SoCs 416 417# 418# This is sorted alphabetically by mach-* pathname. However, plat-* 419# Kconfigs may be included either alphabetically (according to the 420# plat- suffix) or along side the corresponding mach-* source. 421# 422source "arch/arm/mach-actions/Kconfig" 423 424source "arch/arm/mach-alpine/Kconfig" 425 426source "arch/arm/mach-artpec/Kconfig" 427 428source "arch/arm/mach-asm9260/Kconfig" 429 430source "arch/arm/mach-aspeed/Kconfig" 431 432source "arch/arm/mach-at91/Kconfig" 433 434source "arch/arm/mach-axxia/Kconfig" 435 436source "arch/arm/mach-bcm/Kconfig" 437 438source "arch/arm/mach-berlin/Kconfig" 439 440source "arch/arm/mach-clps711x/Kconfig" 441 442source "arch/arm/mach-davinci/Kconfig" 443 444source "arch/arm/mach-digicolor/Kconfig" 445 446source "arch/arm/mach-dove/Kconfig" 447 448source "arch/arm/mach-ep93xx/Kconfig" 449 450source "arch/arm/mach-exynos/Kconfig" 451 452source "arch/arm/mach-footbridge/Kconfig" 453 454source "arch/arm/mach-gemini/Kconfig" 455 456source "arch/arm/mach-highbank/Kconfig" 457 458source "arch/arm/mach-hisi/Kconfig" 459 460source "arch/arm/mach-hpe/Kconfig" 461 462source "arch/arm/mach-imx/Kconfig" 463 464source "arch/arm/mach-ixp4xx/Kconfig" 465 466source "arch/arm/mach-keystone/Kconfig" 467 468source "arch/arm/mach-lpc32xx/Kconfig" 469 470source "arch/arm/mach-mediatek/Kconfig" 471 472source "arch/arm/mach-meson/Kconfig" 473 474source "arch/arm/mach-milbeaut/Kconfig" 475 476source "arch/arm/mach-mmp/Kconfig" 477 478source "arch/arm/mach-moxart/Kconfig" 479 480source "arch/arm/mach-mstar/Kconfig" 481 482source "arch/arm/mach-mv78xx0/Kconfig" 483 484source "arch/arm/mach-mvebu/Kconfig" 485 486source "arch/arm/mach-mxs/Kconfig" 487 488source "arch/arm/mach-nomadik/Kconfig" 489 490source "arch/arm/mach-npcm/Kconfig" 491 492source "arch/arm/mach-nspire/Kconfig" 493 494source "arch/arm/mach-omap1/Kconfig" 495 496source "arch/arm/mach-omap2/Kconfig" 497 498source "arch/arm/mach-orion5x/Kconfig" 499 500source "arch/arm/mach-pxa/Kconfig" 501 502source "arch/arm/mach-qcom/Kconfig" 503 504source "arch/arm/mach-rda/Kconfig" 505 506source "arch/arm/mach-realtek/Kconfig" 507 508source "arch/arm/mach-rpc/Kconfig" 509 510source "arch/arm/mach-rockchip/Kconfig" 511 512source "arch/arm/mach-s3c/Kconfig" 513 514source "arch/arm/mach-s5pv210/Kconfig" 515 516source "arch/arm/mach-sa1100/Kconfig" 517 518source "arch/arm/mach-shmobile/Kconfig" 519 520source "arch/arm/mach-socfpga/Kconfig" 521 522source "arch/arm/mach-spear/Kconfig" 523 524source "arch/arm/mach-sti/Kconfig" 525 526source "arch/arm/mach-stm32/Kconfig" 527 528source "arch/arm/mach-sunplus/Kconfig" 529 530source "arch/arm/mach-sunxi/Kconfig" 531 532source "arch/arm/mach-tegra/Kconfig" 533 534source "arch/arm/mach-uniphier/Kconfig" 535 536source "arch/arm/mach-ux500/Kconfig" 537 538source "arch/arm/mach-versatile/Kconfig" 539 540source "arch/arm/mach-vt8500/Kconfig" 541 542source "arch/arm/mach-zynq/Kconfig" 543 544# ARMv7-M architecture 545config ARCH_LPC18XX 546 bool "NXP LPC18xx/LPC43xx" 547 depends on ARM_SINGLE_ARMV7M 548 select ARCH_HAS_RESET_CONTROLLER 549 select ARM_AMBA 550 select CLKSRC_LPC32XX 551 select PINCTRL 552 help 553 Support for NXP's LPC18xx Cortex-M3 and LPC43xx Cortex-M4 554 high performance microcontrollers. 555 556config ARCH_MPS2 557 bool "ARM MPS2 platform" 558 depends on ARM_SINGLE_ARMV7M 559 select ARM_AMBA 560 select CLKSRC_MPS2 561 help 562 Support for Cortex-M Prototyping System (or V2M-MPS2) which comes 563 with a range of available cores like Cortex-M3/M4/M7. 564 565 Please, note that depends which Application Note is used memory map 566 for the platform may vary, so adjustment of RAM base might be needed. 567 568# Definitions to make life easier 569config ARCH_ACORN 570 bool 571 572config PLAT_ORION 573 bool 574 select CLKSRC_MMIO 575 select GENERIC_IRQ_CHIP 576 select IRQ_DOMAIN 577 578config PLAT_ORION_LEGACY 579 bool 580 select PLAT_ORION 581 582config PLAT_VERSATILE 583 bool 584 585source "arch/arm/mm/Kconfig" 586 587config IWMMXT 588 bool "Enable iWMMXt support" 589 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B 590 default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B 591 help 592 Enable support for iWMMXt context switching at run time if 593 running on a CPU that supports it. 594 595if !MMU 596source "arch/arm/Kconfig-nommu" 597endif 598 599config PJ4B_ERRATA_4742 600 bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation" 601 depends on CPU_PJ4B && MACH_ARMADA_370 602 default y 603 help 604 When coming out of either a Wait for Interrupt (WFI) or a Wait for 605 Event (WFE) IDLE states, a specific timing sensitivity exists between 606 the retiring WFI/WFE instructions and the newly issued subsequent 607 instructions. This sensitivity can result in a CPU hang scenario. 608 Workaround: 609 The software must insert either a Data Synchronization Barrier (DSB) 610 or Data Memory Barrier (DMB) command immediately after the WFI/WFE 611 instruction 612 613config ARM_ERRATA_326103 614 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory" 615 depends on CPU_V6 616 help 617 Executing a SWP instruction to read-only memory does not set bit 11 618 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to 619 treat the access as a read, preventing a COW from occurring and 620 causing the faulting task to livelock. 621 622config ARM_ERRATA_411920 623 bool "ARM errata: Invalidation of the Instruction Cache operation can fail" 624 depends on CPU_V6 || CPU_V6K 625 help 626 Invalidation of the Instruction Cache operation can 627 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176. 628 It does not affect the MPCore. This option enables the ARM Ltd. 629 recommended workaround. 630 631config ARM_ERRATA_430973 632 bool "ARM errata: Stale prediction on replaced interworking branch" 633 depends on CPU_V7 634 help 635 This option enables the workaround for the 430973 Cortex-A8 636 r1p* erratum. If a code sequence containing an ARM/Thumb 637 interworking branch is replaced with another code sequence at the 638 same virtual address, whether due to self-modifying code or virtual 639 to physical address re-mapping, Cortex-A8 does not recover from the 640 stale interworking branch prediction. This results in Cortex-A8 641 executing the new code sequence in the incorrect ARM or Thumb state. 642 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE 643 and also flushes the branch target cache at every context switch. 644 Note that setting specific bits in the ACTLR register may not be 645 available in non-secure mode. 646 647config ARM_ERRATA_458693 648 bool "ARM errata: Processor deadlock when a false hazard is created" 649 depends on CPU_V7 650 depends on !ARCH_MULTIPLATFORM 651 help 652 This option enables the workaround for the 458693 Cortex-A8 (r2p0) 653 erratum. For very specific sequences of memory operations, it is 654 possible for a hazard condition intended for a cache line to instead 655 be incorrectly associated with a different cache line. This false 656 hazard might then cause a processor deadlock. The workaround enables 657 the L1 caching of the NEON accesses and disables the PLD instruction 658 in the ACTLR register. Note that setting specific bits in the ACTLR 659 register may not be available in non-secure mode and thus is not 660 available on a multiplatform kernel. This should be applied by the 661 bootloader instead. 662 663config ARM_ERRATA_460075 664 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data" 665 depends on CPU_V7 666 depends on !ARCH_MULTIPLATFORM 667 help 668 This option enables the workaround for the 460075 Cortex-A8 (r2p0) 669 erratum. Any asynchronous access to the L2 cache may encounter a 670 situation in which recent store transactions to the L2 cache are lost 671 and overwritten with stale memory contents from external memory. The 672 workaround disables the write-allocate mode for the L2 cache via the 673 ACTLR register. Note that setting specific bits in the ACTLR register 674 may not be available in non-secure mode and thus is not available on 675 a multiplatform kernel. This should be applied by the bootloader 676 instead. 677 678config ARM_ERRATA_742230 679 bool "ARM errata: DMB operation may be faulty" 680 depends on CPU_V7 && SMP 681 depends on !ARCH_MULTIPLATFORM 682 help 683 This option enables the workaround for the 742230 Cortex-A9 684 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction 685 between two write operations may not ensure the correct visibility 686 ordering of the two writes. This workaround sets a specific bit in 687 the diagnostic register of the Cortex-A9 which causes the DMB 688 instruction to behave as a DSB, ensuring the correct behaviour of 689 the two writes. Note that setting specific bits in the diagnostics 690 register may not be available in non-secure mode and thus is not 691 available on a multiplatform kernel. This should be applied by the 692 bootloader instead. 693 694config ARM_ERRATA_742231 695 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption" 696 depends on CPU_V7 && SMP 697 depends on !ARCH_MULTIPLATFORM 698 help 699 This option enables the workaround for the 742231 Cortex-A9 700 (r2p0..r2p2) erratum. Under certain conditions, specific to the 701 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode, 702 accessing some data located in the same cache line, may get corrupted 703 data due to bad handling of the address hazard when the line gets 704 replaced from one of the CPUs at the same time as another CPU is 705 accessing it. This workaround sets specific bits in the diagnostic 706 register of the Cortex-A9 which reduces the linefill issuing 707 capabilities of the processor. Note that setting specific bits in the 708 diagnostics register may not be available in non-secure mode and thus 709 is not available on a multiplatform kernel. This should be applied by 710 the bootloader instead. 711 712config ARM_ERRATA_643719 713 bool "ARM errata: LoUIS bit field in CLIDR register is incorrect" 714 depends on CPU_V7 && SMP 715 default y 716 help 717 This option enables the workaround for the 643719 Cortex-A9 (prior to 718 r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR 719 register returns zero when it should return one. The workaround 720 corrects this value, ensuring cache maintenance operations which use 721 it behave as intended and avoiding data corruption. 722 723config ARM_ERRATA_720789 724 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID" 725 depends on CPU_V7 726 help 727 This option enables the workaround for the 720789 Cortex-A9 (prior to 728 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the 729 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS. 730 As a consequence of this erratum, some TLB entries which should be 731 invalidated are not, resulting in an incoherency in the system page 732 tables. The workaround changes the TLB flushing routines to invalidate 733 entries regardless of the ASID. 734 735config ARM_ERRATA_743622 736 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption" 737 depends on CPU_V7 738 depends on !ARCH_MULTIPLATFORM 739 help 740 This option enables the workaround for the 743622 Cortex-A9 741 (r2p*) erratum. Under very rare conditions, a faulty 742 optimisation in the Cortex-A9 Store Buffer may lead to data 743 corruption. This workaround sets a specific bit in the diagnostic 744 register of the Cortex-A9 which disables the Store Buffer 745 optimisation, preventing the defect from occurring. This has no 746 visible impact on the overall performance or power consumption of the 747 processor. Note that setting specific bits in the diagnostics register 748 may not be available in non-secure mode and thus is not available on a 749 multiplatform kernel. This should be applied by the bootloader instead. 750 751config ARM_ERRATA_751472 752 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation" 753 depends on CPU_V7 754 depends on !ARCH_MULTIPLATFORM 755 help 756 This option enables the workaround for the 751472 Cortex-A9 (prior 757 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the 758 completion of a following broadcasted operation if the second 759 operation is received by a CPU before the ICIALLUIS has completed, 760 potentially leading to corrupted entries in the cache or TLB. 761 Note that setting specific bits in the diagnostics register may 762 not be available in non-secure mode and thus is not available on 763 a multiplatform kernel. This should be applied by the bootloader 764 instead. 765 766config ARM_ERRATA_754322 767 bool "ARM errata: possible faulty MMU translations following an ASID switch" 768 depends on CPU_V7 769 help 770 This option enables the workaround for the 754322 Cortex-A9 (r2p*, 771 r3p*) erratum. A speculative memory access may cause a page table walk 772 which starts prior to an ASID switch but completes afterwards. This 773 can populate the micro-TLB with a stale entry which may be hit with 774 the new ASID. This workaround places two dsb instructions in the mm 775 switching code so that no page table walks can cross the ASID switch. 776 777config ARM_ERRATA_754327 778 bool "ARM errata: no automatic Store Buffer drain" 779 depends on CPU_V7 && SMP 780 help 781 This option enables the workaround for the 754327 Cortex-A9 (prior to 782 r2p0) erratum. The Store Buffer does not have any automatic draining 783 mechanism and therefore a livelock may occur if an external agent 784 continuously polls a memory location waiting to observe an update. 785 This workaround defines cpu_relax() as smp_mb(), preventing correctly 786 written polling loops from denying visibility of updates to memory. 787 788config ARM_ERRATA_364296 789 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled" 790 depends on CPU_V6 791 help 792 This options enables the workaround for the 364296 ARM1136 793 r0p2 erratum (possible cache data corruption with 794 hit-under-miss enabled). It sets the undocumented bit 31 in 795 the auxiliary control register and the FI bit in the control 796 register, thus disabling hit-under-miss without putting the 797 processor into full low interrupt latency mode. ARM11MPCore 798 is not affected. 799 800config ARM_ERRATA_764369 801 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed" 802 depends on CPU_V7 && SMP 803 help 804 This option enables the workaround for erratum 764369 805 affecting Cortex-A9 MPCore with two or more processors (all 806 current revisions). Under certain timing circumstances, a data 807 cache line maintenance operation by MVA targeting an Inner 808 Shareable memory region may fail to proceed up to either the 809 Point of Coherency or to the Point of Unification of the 810 system. This workaround adds a DSB instruction before the 811 relevant cache maintenance functions and sets a specific bit 812 in the diagnostic control register of the SCU. 813 814config ARM_ERRATA_764319 815 bool "ARM errata: Read to DBGPRSR and DBGOSLSR may generate Undefined instruction" 816 depends on CPU_V7 817 help 818 This option enables the workaround for the 764319 Cortex A-9 erratum. 819 CP14 read accesses to the DBGPRSR and DBGOSLSR registers generate an 820 unexpected Undefined Instruction exception when the DBGSWENABLE 821 external pin is set to 0, even when the CP14 accesses are performed 822 from a privileged mode. This work around catches the exception in a 823 way the kernel does not stop execution. 824 825config ARM_ERRATA_775420 826 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock" 827 depends on CPU_V7 828 help 829 This option enables the workaround for the 775420 Cortex-A9 (r2p2, 830 r2p6,r2p8,r2p10,r3p0) erratum. In case a data cache maintenance 831 operation aborts with MMU exception, it might cause the processor 832 to deadlock. This workaround puts DSB before executing ISB if 833 an abort may occur on cache maintenance. 834 835config ARM_ERRATA_798181 836 bool "ARM errata: TLBI/DSB failure on Cortex-A15" 837 depends on CPU_V7 && SMP 838 help 839 On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not 840 adequately shooting down all use of the old entries. This 841 option enables the Linux kernel workaround for this erratum 842 which sends an IPI to the CPUs that are running the same ASID 843 as the one being invalidated. 844 845config ARM_ERRATA_773022 846 bool "ARM errata: incorrect instructions may be executed from loop buffer" 847 depends on CPU_V7 848 help 849 This option enables the workaround for the 773022 Cortex-A15 850 (up to r0p4) erratum. In certain rare sequences of code, the 851 loop buffer may deliver incorrect instructions. This 852 workaround disables the loop buffer to avoid the erratum. 853 854config ARM_ERRATA_818325_852422 855 bool "ARM errata: A12: some seqs of opposed cond code instrs => deadlock or corruption" 856 depends on CPU_V7 857 help 858 This option enables the workaround for: 859 - Cortex-A12 818325: Execution of an UNPREDICTABLE STR or STM 860 instruction might deadlock. Fixed in r0p1. 861 - Cortex-A12 852422: Execution of a sequence of instructions might 862 lead to either a data corruption or a CPU deadlock. Not fixed in 863 any Cortex-A12 cores yet. 864 This workaround for all both errata involves setting bit[12] of the 865 Feature Register. This bit disables an optimisation applied to a 866 sequence of 2 instructions that use opposing condition codes. 867 868config ARM_ERRATA_821420 869 bool "ARM errata: A12: sequence of VMOV to core registers might lead to a dead lock" 870 depends on CPU_V7 871 help 872 This option enables the workaround for the 821420 Cortex-A12 873 (all revs) erratum. In very rare timing conditions, a sequence 874 of VMOV to Core registers instructions, for which the second 875 one is in the shadow of a branch or abort, can lead to a 876 deadlock when the VMOV instructions are issued out-of-order. 877 878config ARM_ERRATA_825619 879 bool "ARM errata: A12: DMB NSHST/ISHST mixed ... might cause deadlock" 880 depends on CPU_V7 881 help 882 This option enables the workaround for the 825619 Cortex-A12 883 (all revs) erratum. Within rare timing constraints, executing a 884 DMB NSHST or DMB ISHST instruction followed by a mix of Cacheable 885 and Device/Strongly-Ordered loads and stores might cause deadlock 886 887config ARM_ERRATA_857271 888 bool "ARM errata: A12: CPU might deadlock under some very rare internal conditions" 889 depends on CPU_V7 890 help 891 This option enables the workaround for the 857271 Cortex-A12 892 (all revs) erratum. Under very rare timing conditions, the CPU might 893 hang. The workaround is expected to have a < 1% performance impact. 894 895config ARM_ERRATA_852421 896 bool "ARM errata: A17: DMB ST might fail to create order between stores" 897 depends on CPU_V7 898 help 899 This option enables the workaround for the 852421 Cortex-A17 900 (r1p0, r1p1, r1p2) erratum. Under very rare timing conditions, 901 execution of a DMB ST instruction might fail to properly order 902 stores from GroupA and stores from GroupB. 903 904config ARM_ERRATA_852423 905 bool "ARM errata: A17: some seqs of opposed cond code instrs => deadlock or corruption" 906 depends on CPU_V7 907 help 908 This option enables the workaround for: 909 - Cortex-A17 852423: Execution of a sequence of instructions might 910 lead to either a data corruption or a CPU deadlock. Not fixed in 911 any Cortex-A17 cores yet. 912 This is identical to Cortex-A12 erratum 852422. It is a separate 913 config option from the A12 erratum due to the way errata are checked 914 for and handled. 915 916config ARM_ERRATA_857272 917 bool "ARM errata: A17: CPU might deadlock under some very rare internal conditions" 918 depends on CPU_V7 919 help 920 This option enables the workaround for the 857272 Cortex-A17 erratum. 921 This erratum is not known to be fixed in any A17 revision. 922 This is identical to Cortex-A12 erratum 857271. It is a separate 923 config option from the A12 erratum due to the way errata are checked 924 for and handled. 925 926endmenu 927 928source "arch/arm/common/Kconfig" 929 930menu "Bus support" 931 932config ISA 933 bool 934 help 935 Find out whether you have ISA slots on your motherboard. ISA is the 936 name of a bus system, i.e. the way the CPU talks to the other stuff 937 inside your box. Other bus systems are PCI, EISA, MicroChannel 938 (MCA) or VESA. ISA is an older system, now being displaced by PCI; 939 newer boards don't support it. If you have ISA, say Y, otherwise N. 940 941# Select ISA DMA interface 942config ISA_DMA_API 943 bool 944 945config ARM_ERRATA_814220 946 bool "ARM errata: Cache maintenance by set/way operations can execute out of order" 947 depends on CPU_V7 948 help 949 The v7 ARM states that all cache and branch predictor maintenance 950 operations that do not specify an address execute, relative to 951 each other, in program order. 952 However, because of this erratum, an L2 set/way cache maintenance 953 operation can overtake an L1 set/way cache maintenance operation. 954 This ERRATA only affected the Cortex-A7 and present in r0p2, r0p3, 955 r0p4, r0p5. 956 957endmenu 958 959menu "Kernel Features" 960 961config HAVE_SMP 962 bool 963 help 964 This option should be selected by machines which have an SMP- 965 capable CPU. 966 967 The only effect of this option is to make the SMP-related 968 options available to the user for configuration. 969 970config SMP 971 bool "Symmetric Multi-Processing" 972 depends on CPU_V6K || CPU_V7 973 depends on HAVE_SMP 974 depends on MMU || ARM_MPU 975 select IRQ_WORK 976 help 977 This enables support for systems with more than one CPU. If you have 978 a system with only one CPU, say N. If you have a system with more 979 than one CPU, say Y. 980 981 If you say N here, the kernel will run on uni- and multiprocessor 982 machines, but will use only one CPU of a multiprocessor machine. If 983 you say Y here, the kernel will run on many, but not all, 984 uniprocessor machines. On a uniprocessor machine, the kernel 985 will run faster if you say N here. 986 987 See also <file:Documentation/arch/x86/i386/IO-APIC.rst>, 988 <file:Documentation/admin-guide/lockup-watchdogs.rst> and the SMP-HOWTO available at 989 <http://tldp.org/HOWTO/SMP-HOWTO.html>. 990 991 If you don't know what to do here, say N. 992 993config SMP_ON_UP 994 bool "Allow booting SMP kernel on uniprocessor systems" 995 depends on SMP && MMU 996 default y 997 help 998 SMP kernels contain instructions which fail on non-SMP processors. 999 Enabling this option allows the kernel to modify itself to make 1000 these instructions safe. Disabling it allows about 1K of space 1001 savings. 1002 1003 If you don't know what to do here, say Y. 1004 1005 1006config CURRENT_POINTER_IN_TPIDRURO 1007 def_bool y 1008 depends on CPU_32v6K && !CPU_V6 1009 1010config IRQSTACKS 1011 def_bool y 1012 select HAVE_IRQ_EXIT_ON_IRQ_STACK 1013 select HAVE_SOFTIRQ_ON_OWN_STACK 1014 1015config ARM_CPU_TOPOLOGY 1016 bool "Support cpu topology definition" 1017 depends on SMP && CPU_V7 1018 default y 1019 help 1020 Support ARM cpu topology definition. The MPIDR register defines 1021 affinity between processors which is then used to describe the cpu 1022 topology of an ARM System. 1023 1024config SCHED_MC 1025 bool "Multi-core scheduler support" 1026 depends on ARM_CPU_TOPOLOGY 1027 help 1028 Multi-core scheduler support improves the CPU scheduler's decision 1029 making when dealing with multi-core CPU chips at a cost of slightly 1030 increased overhead in some places. If unsure say N here. 1031 1032config SCHED_SMT 1033 bool "SMT scheduler support" 1034 depends on ARM_CPU_TOPOLOGY 1035 help 1036 Improves the CPU scheduler's decision making when dealing with 1037 MultiThreading at a cost of slightly increased overhead in some 1038 places. If unsure say N here. 1039 1040config HAVE_ARM_SCU 1041 bool 1042 help 1043 This option enables support for the ARM snoop control unit 1044 1045config HAVE_ARM_ARCH_TIMER 1046 bool "Architected timer support" 1047 depends on CPU_V7 1048 select ARM_ARCH_TIMER 1049 help 1050 This option enables support for the ARM architected timer 1051 1052config HAVE_ARM_TWD 1053 bool 1054 help 1055 This options enables support for the ARM timer and watchdog unit 1056 1057config MCPM 1058 bool "Multi-Cluster Power Management" 1059 depends on CPU_V7 && SMP 1060 help 1061 This option provides the common power management infrastructure 1062 for (multi-)cluster based systems, such as big.LITTLE based 1063 systems. 1064 1065config MCPM_QUAD_CLUSTER 1066 bool 1067 depends on MCPM 1068 help 1069 To avoid wasting resources unnecessarily, MCPM only supports up 1070 to 2 clusters by default. 1071 Platforms with 3 or 4 clusters that use MCPM must select this 1072 option to allow the additional clusters to be managed. 1073 1074config BIG_LITTLE 1075 bool "big.LITTLE support (Experimental)" 1076 depends on CPU_V7 && SMP 1077 select MCPM 1078 help 1079 This option enables support selections for the big.LITTLE 1080 system architecture. 1081 1082config BL_SWITCHER 1083 bool "big.LITTLE switcher support" 1084 depends on BIG_LITTLE && MCPM && HOTPLUG_CPU && ARM_GIC 1085 select CPU_PM 1086 help 1087 The big.LITTLE "switcher" provides the core functionality to 1088 transparently handle transition between a cluster of A15's 1089 and a cluster of A7's in a big.LITTLE system. 1090 1091config BL_SWITCHER_DUMMY_IF 1092 tristate "Simple big.LITTLE switcher user interface" 1093 depends on BL_SWITCHER && DEBUG_KERNEL 1094 help 1095 This is a simple and dummy char dev interface to control 1096 the big.LITTLE switcher core code. It is meant for 1097 debugging purposes only. 1098 1099choice 1100 prompt "Memory split" 1101 depends on MMU 1102 default VMSPLIT_3G 1103 help 1104 Select the desired split between kernel and user memory. 1105 1106 If you are not absolutely sure what you are doing, leave this 1107 option alone! 1108 1109 config VMSPLIT_3G 1110 bool "3G/1G user/kernel split" 1111 config VMSPLIT_3G_OPT 1112 depends on !ARM_LPAE 1113 bool "3G/1G user/kernel split (for full 1G low memory)" 1114 config VMSPLIT_2G 1115 bool "2G/2G user/kernel split" 1116 config VMSPLIT_1G 1117 bool "1G/3G user/kernel split" 1118endchoice 1119 1120config PAGE_OFFSET 1121 hex 1122 default PHYS_OFFSET if !MMU 1123 default 0x40000000 if VMSPLIT_1G 1124 default 0x80000000 if VMSPLIT_2G 1125 default 0xB0000000 if VMSPLIT_3G_OPT 1126 default 0xC0000000 1127 1128config KASAN_SHADOW_OFFSET 1129 hex 1130 depends on KASAN 1131 default 0x1f000000 if PAGE_OFFSET=0x40000000 1132 default 0x5f000000 if PAGE_OFFSET=0x80000000 1133 default 0x9f000000 if PAGE_OFFSET=0xC0000000 1134 default 0x8f000000 if PAGE_OFFSET=0xB0000000 1135 default 0xffffffff 1136 1137config NR_CPUS 1138 int "Maximum number of CPUs (2-32)" 1139 range 2 16 if DEBUG_KMAP_LOCAL 1140 range 2 32 if !DEBUG_KMAP_LOCAL 1141 depends on SMP 1142 default "4" 1143 help 1144 The maximum number of CPUs that the kernel can support. 1145 Up to 32 CPUs can be supported, or up to 16 if kmap_local() 1146 debugging is enabled, which uses half of the per-CPU fixmap 1147 slots as guard regions. 1148 1149config HOTPLUG_CPU 1150 bool "Support for hot-pluggable CPUs" 1151 depends on SMP 1152 select GENERIC_IRQ_MIGRATION 1153 help 1154 Say Y here to experiment with turning CPUs off and on. CPUs 1155 can be controlled through /sys/devices/system/cpu. 1156 1157config ARM_PSCI 1158 bool "Support for the ARM Power State Coordination Interface (PSCI)" 1159 depends on HAVE_ARM_SMCCC 1160 select ARM_PSCI_FW 1161 help 1162 Say Y here if you want Linux to communicate with system firmware 1163 implementing the PSCI specification for CPU-centric power 1164 management operations described in ARM document number ARM DEN 1165 0022A ("Power State Coordination Interface System Software on 1166 ARM processors"). 1167 1168config HZ_FIXED 1169 int 1170 default 128 if SOC_AT91RM9200 1171 default 0 1172 1173choice 1174 depends on HZ_FIXED = 0 1175 prompt "Timer frequency" 1176 1177config HZ_100 1178 bool "100 Hz" 1179 1180config HZ_200 1181 bool "200 Hz" 1182 1183config HZ_250 1184 bool "250 Hz" 1185 1186config HZ_300 1187 bool "300 Hz" 1188 1189config HZ_500 1190 bool "500 Hz" 1191 1192config HZ_1000 1193 bool "1000 Hz" 1194 1195endchoice 1196 1197config HZ 1198 int 1199 default HZ_FIXED if HZ_FIXED != 0 1200 default 100 if HZ_100 1201 default 200 if HZ_200 1202 default 250 if HZ_250 1203 default 300 if HZ_300 1204 default 500 if HZ_500 1205 default 1000 1206 1207config SCHED_HRTICK 1208 def_bool HIGH_RES_TIMERS 1209 1210config THUMB2_KERNEL 1211 bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY 1212 depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K 1213 default y if CPU_THUMBONLY 1214 select ARM_UNWIND 1215 help 1216 By enabling this option, the kernel will be compiled in 1217 Thumb-2 mode. 1218 1219 If unsure, say N. 1220 1221config ARM_PATCH_IDIV 1222 bool "Runtime patch udiv/sdiv instructions into __aeabi_{u}idiv()" 1223 depends on CPU_32v7 1224 default y 1225 help 1226 The ARM compiler inserts calls to __aeabi_idiv() and 1227 __aeabi_uidiv() when it needs to perform division on signed 1228 and unsigned integers. Some v7 CPUs have support for the sdiv 1229 and udiv instructions that can be used to implement those 1230 functions. 1231 1232 Enabling this option allows the kernel to modify itself to 1233 replace the first two instructions of these library functions 1234 with the sdiv or udiv plus "bx lr" instructions when the CPU 1235 it is running on supports them. Typically this will be faster 1236 and less power intensive than running the original library 1237 code to do integer division. 1238 1239config AEABI 1240 bool "Use the ARM EABI to compile the kernel" if !CPU_V7 && \ 1241 !CPU_V7M && !CPU_V6 && !CPU_V6K && !CC_IS_CLANG 1242 default CPU_V7 || CPU_V7M || CPU_V6 || CPU_V6K || CC_IS_CLANG 1243 help 1244 This option allows for the kernel to be compiled using the latest 1245 ARM ABI (aka EABI). This is only useful if you are using a user 1246 space environment that is also compiled with EABI. 1247 1248 Since there are major incompatibilities between the legacy ABI and 1249 EABI, especially with regard to structure member alignment, this 1250 option also changes the kernel syscall calling convention to 1251 disambiguate both ABIs and allow for backward compatibility support 1252 (selected with CONFIG_OABI_COMPAT). 1253 1254 To use this you need GCC version 4.0.0 or later. 1255 1256config OABI_COMPAT 1257 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)" 1258 depends on AEABI && !THUMB2_KERNEL 1259 help 1260 This option preserves the old syscall interface along with the 1261 new (ARM EABI) one. It also provides a compatibility layer to 1262 intercept syscalls that have structure arguments which layout 1263 in memory differs between the legacy ABI and the new ARM EABI 1264 (only for non "thumb" binaries). This option adds a tiny 1265 overhead to all syscalls and produces a slightly larger kernel. 1266 1267 The seccomp filter system will not be available when this is 1268 selected, since there is no way yet to sensibly distinguish 1269 between calling conventions during filtering. 1270 1271 If you know you'll be using only pure EABI user space then you 1272 can say N here. If this option is not selected and you attempt 1273 to execute a legacy ABI binary then the result will be 1274 UNPREDICTABLE (in fact it can be predicted that it won't work 1275 at all). If in doubt say N. 1276 1277config ARCH_SELECT_MEMORY_MODEL 1278 def_bool y 1279 1280config ARCH_FLATMEM_ENABLE 1281 def_bool !(ARCH_RPC || ARCH_SA1100) 1282 1283config ARCH_SPARSEMEM_ENABLE 1284 def_bool !ARCH_FOOTBRIDGE 1285 select SPARSEMEM_STATIC if SPARSEMEM 1286 1287config HIGHMEM 1288 bool "High Memory Support" 1289 depends on MMU 1290 select KMAP_LOCAL 1291 select KMAP_LOCAL_NON_LINEAR_PTE_ARRAY 1292 help 1293 The address space of ARM processors is only 4 Gigabytes large 1294 and it has to accommodate user address space, kernel address 1295 space as well as some memory mapped IO. That means that, if you 1296 have a large amount of physical memory and/or IO, not all of the 1297 memory can be "permanently mapped" by the kernel. The physical 1298 memory that is not permanently mapped is called "high memory". 1299 1300 Depending on the selected kernel/user memory split, minimum 1301 vmalloc space and actual amount of RAM, you may not need this 1302 option which should result in a slightly faster kernel. 1303 1304 If unsure, say n. 1305 1306config HIGHPTE 1307 bool "Allocate 2nd-level pagetables from highmem" if EXPERT 1308 depends on HIGHMEM 1309 default y 1310 help 1311 The VM uses one page of physical memory for each page table. 1312 For systems with a lot of processes, this can use a lot of 1313 precious low memory, eventually leading to low memory being 1314 consumed by page tables. Setting this option will allow 1315 user-space 2nd level page tables to reside in high memory. 1316 1317config CPU_SW_DOMAIN_PAN 1318 bool "Enable use of CPU domains to implement privileged no-access" 1319 depends on MMU && !ARM_LPAE 1320 default y 1321 help 1322 Increase kernel security by ensuring that normal kernel accesses 1323 are unable to access userspace addresses. This can help prevent 1324 use-after-free bugs becoming an exploitable privilege escalation 1325 by ensuring that magic values (such as LIST_POISON) will always 1326 fault when dereferenced. 1327 1328 CPUs with low-vector mappings use a best-efforts implementation. 1329 Their lower 1MB needs to remain accessible for the vectors, but 1330 the remainder of userspace will become appropriately inaccessible. 1331 1332config HW_PERF_EVENTS 1333 def_bool y 1334 depends on ARM_PMU 1335 1336config ARM_MODULE_PLTS 1337 bool "Use PLTs to allow module memory to spill over into vmalloc area" 1338 depends on MODULES 1339 select KASAN_VMALLOC if KASAN 1340 default y 1341 help 1342 Allocate PLTs when loading modules so that jumps and calls whose 1343 targets are too far away for their relative offsets to be encoded 1344 in the instructions themselves can be bounced via veneers in the 1345 module's PLT. This allows modules to be allocated in the generic 1346 vmalloc area after the dedicated module memory area has been 1347 exhausted. The modules will use slightly more memory, but after 1348 rounding up to page size, the actual memory footprint is usually 1349 the same. 1350 1351 Disabling this is usually safe for small single-platform 1352 configurations. If unsure, say y. 1353 1354config ARCH_FORCE_MAX_ORDER 1355 int "Order of maximal physically contiguous allocations" 1356 default "11" if SOC_AM33XX 1357 default "8" if SA1111 1358 default "10" 1359 help 1360 The kernel page allocator limits the size of maximal physically 1361 contiguous allocations. The limit is called MAX_ORDER and it 1362 defines the maximal power of two of number of pages that can be 1363 allocated as a single contiguous block. This option allows 1364 overriding the default setting when ability to allocate very 1365 large blocks of physically contiguous memory is required. 1366 1367 Don't change if unsure. 1368 1369config ALIGNMENT_TRAP 1370 def_bool CPU_CP15_MMU 1371 select HAVE_PROC_CPU if PROC_FS 1372 help 1373 ARM processors cannot fetch/store information which is not 1374 naturally aligned on the bus, i.e., a 4 byte fetch must start at an 1375 address divisible by 4. On 32-bit ARM processors, these non-aligned 1376 fetch/store instructions will be emulated in software if you say 1377 here, which has a severe performance impact. This is necessary for 1378 correct operation of some network protocols. With an IP-only 1379 configuration it is safe to say N, otherwise say Y. 1380 1381config UACCESS_WITH_MEMCPY 1382 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()" 1383 depends on MMU 1384 default y if CPU_FEROCEON 1385 help 1386 Implement faster copy_to_user and clear_user methods for CPU 1387 cores where a 8-word STM instruction give significantly higher 1388 memory write throughput than a sequence of individual 32bit stores. 1389 1390 A possible side effect is a slight increase in scheduling latency 1391 between threads sharing the same address space if they invoke 1392 such copy operations with large buffers. 1393 1394 However, if the CPU data cache is using a write-allocate mode, 1395 this option is unlikely to provide any performance gain. 1396 1397config PARAVIRT 1398 bool "Enable paravirtualization code" 1399 help 1400 This changes the kernel so it can modify itself when it is run 1401 under a hypervisor, potentially improving performance significantly 1402 over full virtualization. 1403 1404config PARAVIRT_TIME_ACCOUNTING 1405 bool "Paravirtual steal time accounting" 1406 select PARAVIRT 1407 help 1408 Select this option to enable fine granularity task steal time 1409 accounting. Time spent executing other tasks in parallel with 1410 the current vCPU is discounted from the vCPU power. To account for 1411 that, there can be a small performance impact. 1412 1413 If in doubt, say N here. 1414 1415config XEN_DOM0 1416 def_bool y 1417 depends on XEN 1418 1419config XEN 1420 bool "Xen guest support on ARM" 1421 depends on ARM && AEABI && OF 1422 depends on CPU_V7 && !CPU_V6 1423 depends on !GENERIC_ATOMIC64 1424 depends on MMU 1425 select ARCH_DMA_ADDR_T_64BIT 1426 select ARM_PSCI 1427 select SWIOTLB 1428 select SWIOTLB_XEN 1429 select PARAVIRT 1430 help 1431 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM. 1432 1433config CC_HAVE_STACKPROTECTOR_TLS 1434 def_bool $(cc-option,-mtp=cp15 -mstack-protector-guard=tls -mstack-protector-guard-offset=0) 1435 1436config STACKPROTECTOR_PER_TASK 1437 bool "Use a unique stack canary value for each task" 1438 depends on STACKPROTECTOR && CURRENT_POINTER_IN_TPIDRURO && !XIP_DEFLATED_DATA 1439 depends on GCC_PLUGINS || CC_HAVE_STACKPROTECTOR_TLS 1440 select GCC_PLUGIN_ARM_SSP_PER_TASK if !CC_HAVE_STACKPROTECTOR_TLS 1441 default y 1442 help 1443 Due to the fact that GCC uses an ordinary symbol reference from 1444 which to load the value of the stack canary, this value can only 1445 change at reboot time on SMP systems, and all tasks running in the 1446 kernel's address space are forced to use the same canary value for 1447 the entire duration that the system is up. 1448 1449 Enable this option to switch to a different method that uses a 1450 different canary value for each task. 1451 1452endmenu 1453 1454menu "Boot options" 1455 1456config USE_OF 1457 bool "Flattened Device Tree support" 1458 select IRQ_DOMAIN 1459 select OF 1460 help 1461 Include support for flattened device tree machine descriptions. 1462 1463config ATAGS 1464 bool "Support for the traditional ATAGS boot data passing" 1465 default y 1466 help 1467 This is the traditional way of passing data to the kernel at boot 1468 time. If you are solely relying on the flattened device tree (or 1469 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option 1470 to remove ATAGS support from your kernel binary. 1471 1472config DEPRECATED_PARAM_STRUCT 1473 bool "Provide old way to pass kernel parameters" 1474 depends on ATAGS 1475 help 1476 This was deprecated in 2001 and announced to live on for 5 years. 1477 Some old boot loaders still use this way. 1478 1479# Compressed boot loader in ROM. Yes, we really want to ask about 1480# TEXT and BSS so we preserve their values in the config files. 1481config ZBOOT_ROM_TEXT 1482 hex "Compressed ROM boot loader base address" 1483 default 0x0 1484 help 1485 The physical address at which the ROM-able zImage is to be 1486 placed in the target. Platforms which normally make use of 1487 ROM-able zImage formats normally set this to a suitable 1488 value in their defconfig file. 1489 1490 If ZBOOT_ROM is not enabled, this has no effect. 1491 1492config ZBOOT_ROM_BSS 1493 hex "Compressed ROM boot loader BSS address" 1494 default 0x0 1495 help 1496 The base address of an area of read/write memory in the target 1497 for the ROM-able zImage which must be available while the 1498 decompressor is running. It must be large enough to hold the 1499 entire decompressed kernel plus an additional 128 KiB. 1500 Platforms which normally make use of ROM-able zImage formats 1501 normally set this to a suitable value in their defconfig file. 1502 1503 If ZBOOT_ROM is not enabled, this has no effect. 1504 1505config ZBOOT_ROM 1506 bool "Compressed boot loader in ROM/flash" 1507 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS 1508 depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR 1509 help 1510 Say Y here if you intend to execute your compressed kernel image 1511 (zImage) directly from ROM or flash. If unsure, say N. 1512 1513config ARM_APPENDED_DTB 1514 bool "Use appended device tree blob to zImage (EXPERIMENTAL)" 1515 depends on OF 1516 help 1517 With this option, the boot code will look for a device tree binary 1518 (DTB) appended to zImage 1519 (e.g. cat zImage <filename>.dtb > zImage_w_dtb). 1520 1521 This is meant as a backward compatibility convenience for those 1522 systems with a bootloader that can't be upgraded to accommodate 1523 the documented boot protocol using a device tree. 1524 1525 Beware that there is very little in terms of protection against 1526 this option being confused by leftover garbage in memory that might 1527 look like a DTB header after a reboot if no actual DTB is appended 1528 to zImage. Do not leave this option active in a production kernel 1529 if you don't intend to always append a DTB. Proper passing of the 1530 location into r2 of a bootloader provided DTB is always preferable 1531 to this option. 1532 1533config ARM_ATAG_DTB_COMPAT 1534 bool "Supplement the appended DTB with traditional ATAG information" 1535 depends on ARM_APPENDED_DTB 1536 help 1537 Some old bootloaders can't be updated to a DTB capable one, yet 1538 they provide ATAGs with memory configuration, the ramdisk address, 1539 the kernel cmdline string, etc. Such information is dynamically 1540 provided by the bootloader and can't always be stored in a static 1541 DTB. To allow a device tree enabled kernel to be used with such 1542 bootloaders, this option allows zImage to extract the information 1543 from the ATAG list and store it at run time into the appended DTB. 1544 1545choice 1546 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT 1547 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER 1548 1549config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER 1550 bool "Use bootloader kernel arguments if available" 1551 help 1552 Uses the command-line options passed by the boot loader instead of 1553 the device tree bootargs property. If the boot loader doesn't provide 1554 any, the device tree bootargs property will be used. 1555 1556config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND 1557 bool "Extend with bootloader kernel arguments" 1558 help 1559 The command-line arguments provided by the boot loader will be 1560 appended to the the device tree bootargs property. 1561 1562endchoice 1563 1564config CMDLINE 1565 string "Default kernel command string" 1566 default "" 1567 help 1568 On some architectures (e.g. CATS), there is currently no way 1569 for the boot loader to pass arguments to the kernel. For these 1570 architectures, you should supply some command-line options at build 1571 time by entering them here. As a minimum, you should specify the 1572 memory size and the root device (e.g., mem=64M root=/dev/nfs). 1573 1574choice 1575 prompt "Kernel command line type" if CMDLINE != "" 1576 default CMDLINE_FROM_BOOTLOADER 1577 1578config CMDLINE_FROM_BOOTLOADER 1579 bool "Use bootloader kernel arguments if available" 1580 help 1581 Uses the command-line options passed by the boot loader. If 1582 the boot loader doesn't provide any, the default kernel command 1583 string provided in CMDLINE will be used. 1584 1585config CMDLINE_EXTEND 1586 bool "Extend bootloader kernel arguments" 1587 help 1588 The command-line arguments provided by the boot loader will be 1589 appended to the default kernel command string. 1590 1591config CMDLINE_FORCE 1592 bool "Always use the default kernel command string" 1593 help 1594 Always use the default kernel command string, even if the boot 1595 loader passes other arguments to the kernel. 1596 This is useful if you cannot or don't want to change the 1597 command-line options your boot loader passes to the kernel. 1598endchoice 1599 1600config XIP_KERNEL 1601 bool "Kernel Execute-In-Place from ROM" 1602 depends on !ARM_LPAE && !ARCH_MULTIPLATFORM 1603 depends on !ARM_PATCH_IDIV && !ARM_PATCH_PHYS_VIRT && !SMP_ON_UP 1604 help 1605 Execute-In-Place allows the kernel to run from non-volatile storage 1606 directly addressable by the CPU, such as NOR flash. This saves RAM 1607 space since the text section of the kernel is not loaded from flash 1608 to RAM. Read-write sections, such as the data section and stack, 1609 are still copied to RAM. The XIP kernel is not compressed since 1610 it has to run directly from flash, so it will take more space to 1611 store it. The flash address used to link the kernel object files, 1612 and for storing it, is configuration dependent. Therefore, if you 1613 say Y here, you must know the proper physical address where to 1614 store the kernel image depending on your own flash memory usage. 1615 1616 Also note that the make target becomes "make xipImage" rather than 1617 "make zImage" or "make Image". The final kernel binary to put in 1618 ROM memory will be arch/arm/boot/xipImage. 1619 1620 If unsure, say N. 1621 1622config XIP_PHYS_ADDR 1623 hex "XIP Kernel Physical Location" 1624 depends on XIP_KERNEL 1625 default "0x00080000" 1626 help 1627 This is the physical address in your flash memory the kernel will 1628 be linked for and stored to. This address is dependent on your 1629 own flash usage. 1630 1631config XIP_DEFLATED_DATA 1632 bool "Store kernel .data section compressed in ROM" 1633 depends on XIP_KERNEL 1634 select ZLIB_INFLATE 1635 help 1636 Before the kernel is actually executed, its .data section has to be 1637 copied to RAM from ROM. This option allows for storing that data 1638 in compressed form and decompressed to RAM rather than merely being 1639 copied, saving some precious ROM space. A possible drawback is a 1640 slightly longer boot delay. 1641 1642config KEXEC 1643 bool "Kexec system call (EXPERIMENTAL)" 1644 depends on (!SMP || PM_SLEEP_SMP) 1645 depends on MMU 1646 select KEXEC_CORE 1647 help 1648 kexec is a system call that implements the ability to shutdown your 1649 current kernel, and to start another kernel. It is like a reboot 1650 but it is independent of the system firmware. And like a reboot 1651 you can start any kernel with it, not just Linux. 1652 1653 It is an ongoing process to be certain the hardware in a machine 1654 is properly shutdown, so do not be surprised if this code does not 1655 initially work for you. 1656 1657config ATAGS_PROC 1658 bool "Export atags in procfs" 1659 depends on ATAGS && KEXEC 1660 default y 1661 help 1662 Should the atags used to boot the kernel be exported in an "atags" 1663 file in procfs. Useful with kexec. 1664 1665config CRASH_DUMP 1666 bool "Build kdump crash kernel (EXPERIMENTAL)" 1667 help 1668 Generate crash dump after being started by kexec. This should 1669 be normally only set in special crash dump kernels which are 1670 loaded in the main kernel with kexec-tools into a specially 1671 reserved region and then later executed after a crash by 1672 kdump/kexec. The crash dump kernel must be compiled to a 1673 memory address not used by the main kernel 1674 1675 For more details see Documentation/admin-guide/kdump/kdump.rst 1676 1677config AUTO_ZRELADDR 1678 bool "Auto calculation of the decompressed kernel image address" if !ARCH_MULTIPLATFORM 1679 default !(ARCH_FOOTBRIDGE || ARCH_RPC || ARCH_SA1100) 1680 help 1681 ZRELADDR is the physical address where the decompressed kernel 1682 image will be placed. If AUTO_ZRELADDR is selected, the address 1683 will be determined at run-time, either by masking the current IP 1684 with 0xf8000000, or, if invalid, from the DTB passed in r2. 1685 This assumes the zImage being placed in the first 128MB from 1686 start of memory. 1687 1688config EFI_STUB 1689 bool 1690 1691config EFI 1692 bool "UEFI runtime support" 1693 depends on OF && !CPU_BIG_ENDIAN && MMU && AUTO_ZRELADDR && !XIP_KERNEL 1694 select UCS2_STRING 1695 select EFI_PARAMS_FROM_FDT 1696 select EFI_STUB 1697 select EFI_GENERIC_STUB 1698 select EFI_RUNTIME_WRAPPERS 1699 help 1700 This option provides support for runtime services provided 1701 by UEFI firmware (such as non-volatile variables, realtime 1702 clock, and platform reset). A UEFI stub is also provided to 1703 allow the kernel to be booted as an EFI application. This 1704 is only useful for kernels that may run on systems that have 1705 UEFI firmware. 1706 1707config DMI 1708 bool "Enable support for SMBIOS (DMI) tables" 1709 depends on EFI 1710 default y 1711 help 1712 This enables SMBIOS/DMI feature for systems. 1713 1714 This option is only useful on systems that have UEFI firmware. 1715 However, even with this option, the resultant kernel should 1716 continue to boot on existing non-UEFI platforms. 1717 1718 NOTE: This does *NOT* enable or encourage the use of DMI quirks, 1719 i.e., the the practice of identifying the platform via DMI to 1720 decide whether certain workarounds for buggy hardware and/or 1721 firmware need to be enabled. This would require the DMI subsystem 1722 to be enabled much earlier than we do on ARM, which is non-trivial. 1723 1724endmenu 1725 1726menu "CPU Power Management" 1727 1728source "drivers/cpufreq/Kconfig" 1729 1730source "drivers/cpuidle/Kconfig" 1731 1732endmenu 1733 1734menu "Floating point emulation" 1735 1736comment "At least one emulation must be selected" 1737 1738config FPE_NWFPE 1739 bool "NWFPE math emulation" 1740 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL 1741 help 1742 Say Y to include the NWFPE floating point emulator in the kernel. 1743 This is necessary to run most binaries. Linux does not currently 1744 support floating point hardware so you need to say Y here even if 1745 your machine has an FPA or floating point co-processor podule. 1746 1747 You may say N here if you are going to load the Acorn FPEmulator 1748 early in the bootup. 1749 1750config FPE_NWFPE_XP 1751 bool "Support extended precision" 1752 depends on FPE_NWFPE 1753 help 1754 Say Y to include 80-bit support in the kernel floating-point 1755 emulator. Otherwise, only 32 and 64-bit support is compiled in. 1756 Note that gcc does not generate 80-bit operations by default, 1757 so in most cases this option only enlarges the size of the 1758 floating point emulator without any good reason. 1759 1760 You almost surely want to say N here. 1761 1762config FPE_FASTFPE 1763 bool "FastFPE math emulation (EXPERIMENTAL)" 1764 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 1765 help 1766 Say Y here to include the FAST floating point emulator in the kernel. 1767 This is an experimental much faster emulator which now also has full 1768 precision for the mantissa. It does not support any exceptions. 1769 It is very simple, and approximately 3-6 times faster than NWFPE. 1770 1771 It should be sufficient for most programs. It may be not suitable 1772 for scientific calculations, but you have to check this for yourself. 1773 If you do not feel you need a faster FP emulation you should better 1774 choose NWFPE. 1775 1776config VFP 1777 bool "VFP-format floating point maths" 1778 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON 1779 help 1780 Say Y to include VFP support code in the kernel. This is needed 1781 if your hardware includes a VFP unit. 1782 1783 Please see <file:Documentation/arch/arm/vfp/release-notes.rst> for 1784 release notes and additional status information. 1785 1786 Say N if your target does not have VFP hardware. 1787 1788config VFPv3 1789 bool 1790 depends on VFP 1791 default y if CPU_V7 1792 1793config NEON 1794 bool "Advanced SIMD (NEON) Extension support" 1795 depends on VFPv3 && CPU_V7 1796 help 1797 Say Y to include support code for NEON, the ARMv7 Advanced SIMD 1798 Extension. 1799 1800config KERNEL_MODE_NEON 1801 bool "Support for NEON in kernel mode" 1802 depends on NEON && AEABI 1803 help 1804 Say Y to include support for NEON in kernel mode. 1805 1806endmenu 1807 1808menu "Power management options" 1809 1810source "kernel/power/Kconfig" 1811 1812config ARCH_SUSPEND_POSSIBLE 1813 depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \ 1814 CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK 1815 def_bool y 1816 1817config ARM_CPU_SUSPEND 1818 def_bool PM_SLEEP || BL_SWITCHER || ARM_PSCI_FW 1819 depends on ARCH_SUSPEND_POSSIBLE 1820 1821config ARCH_HIBERNATION_POSSIBLE 1822 bool 1823 depends on MMU 1824 default y if ARCH_SUSPEND_POSSIBLE 1825 1826endmenu 1827 1828source "arch/arm/Kconfig.assembler" 1829