1# SPDX-License-Identifier: GPL-2.0 2source "arch/powerpc/platforms/Kconfig.cputype" 3 4config PPC32 5 bool 6 default y if !PPC64 7 8config 32BIT 9 bool 10 default y if PPC32 11 12config 64BIT 13 bool 14 default y if PPC64 15 16config MMU 17 bool 18 default y 19 20config ARCH_MMAP_RND_BITS_MAX 21 # On Book3S 64, the default virtual address space for 64-bit processes 22 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to 23 # 32T of address space (2^45), which should ensure a reasonable gap 24 # between bottom-up and top-down allocations for applications that 25 # consume "normal" amounts of address space. Book3S 64 only supports 64K 26 # and 4K page sizes. 27 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K) 28 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K) 29 # 30 # On all other 64-bit platforms (currently only Book3E), the virtual 31 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T 32 # of address space (2^44). Only 4K page sizes are supported. 33 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K) 34 # 35 # For 32-bit, use the compat values, as they're the same. 36 default ARCH_MMAP_RND_COMPAT_BITS_MAX 37 38config ARCH_MMAP_RND_BITS_MIN 39 # Allow randomisation to consume up to 1GB of address space (2^30). 40 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K) 41 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K) 42 # 43 # For 32-bit, use the compat values, as they're the same. 44 default ARCH_MMAP_RND_COMPAT_BITS_MIN 45 46config ARCH_MMAP_RND_COMPAT_BITS_MAX 47 # Total virtual address space for 32-bit processes is 2^31 (2GB). 48 # Allow randomisation to consume up to 512MB of address space (2^29). 49 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K) 50 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K) 51 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K) 52 default 17 # 17 = 29 (512MB) - 12 (4K) 53 54config ARCH_MMAP_RND_COMPAT_BITS_MIN 55 # Total virtual address space for 32-bit processes is 2^31 (2GB). 56 # Allow randomisation to consume up to 8MB of address space (2^23). 57 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K) 58 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K) 59 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K) 60 default 11 # 11 = 23 (8MB) - 12 (4K) 61 62config HAVE_SETUP_PER_CPU_AREA 63 def_bool PPC64 64 65config NEED_PER_CPU_EMBED_FIRST_CHUNK 66 def_bool PPC64 67 68config NR_IRQS 69 int "Number of virtual interrupt numbers" 70 range 32 32768 71 default "512" 72 help 73 This defines the number of virtual interrupt numbers the kernel 74 can manage. Virtual interrupt numbers are what you see in 75 /proc/interrupts. If you configure your system to have too few, 76 drivers will fail to load or worse - handle with care. 77 78config NMI_IPI 79 bool 80 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR) 81 default y 82 83config PPC_WATCHDOG 84 bool 85 depends on HARDLOCKUP_DETECTOR 86 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH 87 default y 88 help 89 This is a placeholder when the powerpc hardlockup detector 90 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is 91 seleted via the generic lockup detector menu which is why we 92 have no standalone config option for it here. 93 94config STACKTRACE_SUPPORT 95 bool 96 default y 97 98config TRACE_IRQFLAGS_SUPPORT 99 bool 100 default y 101 102config LOCKDEP_SUPPORT 103 bool 104 default y 105 106config RWSEM_GENERIC_SPINLOCK 107 bool 108 109config RWSEM_XCHGADD_ALGORITHM 110 bool 111 default y 112 113config GENERIC_LOCKBREAK 114 bool 115 default y 116 depends on SMP && PREEMPT 117 118config GENERIC_HWEIGHT 119 bool 120 default y 121 122config ARCH_HAS_DMA_SET_COHERENT_MASK 123 bool 124 125config PPC 126 bool 127 default y 128 # 129 # Please keep this list sorted alphabetically. 130 # 131 select ARCH_HAS_DEVMEM_IS_ALLOWED 132 select ARCH_HAS_DMA_SET_COHERENT_MASK 133 select ARCH_HAS_ELF_RANDOMIZE 134 select ARCH_HAS_FORTIFY_SOURCE 135 select ARCH_HAS_GCOV_PROFILE_ALL 136 select ARCH_HAS_PHYS_TO_DMA 137 select ARCH_HAS_PMEM_API if PPC64 138 select ARCH_HAS_PTE_SPECIAL 139 select ARCH_HAS_MEMBARRIER_CALLBACKS 140 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE 141 select ARCH_HAS_SG_CHAIN 142 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION) 143 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 144 select ARCH_HAS_UACCESS_FLUSHCACHE if PPC64 145 select ARCH_HAS_UBSAN_SANITIZE_ALL 146 select ARCH_HAS_ZONE_DEVICE if PPC_BOOK3S_64 147 select ARCH_HAVE_NMI_SAFE_CMPXCHG 148 select ARCH_MIGHT_HAVE_PC_PARPORT 149 select ARCH_MIGHT_HAVE_PC_SERIO 150 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX 151 select ARCH_SUPPORTS_ATOMIC_RMW 152 select ARCH_USE_BUILTIN_BSWAP 153 select ARCH_USE_CMPXCHG_LOCKREF if PPC64 154 select ARCH_WANT_IPC_PARSE_VERSION 155 select ARCH_WEAK_RELEASE_ACQUIRE 156 select BINFMT_ELF 157 select BUILDTIME_EXTABLE_SORT 158 select CLONE_BACKWARDS 159 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN 160 select DYNAMIC_FTRACE if FUNCTION_TRACER 161 select EDAC_ATOMIC_SCRUB 162 select EDAC_SUPPORT 163 select GENERIC_ATOMIC64 if PPC32 164 select GENERIC_CLOCKEVENTS 165 select GENERIC_CLOCKEVENTS_BROADCAST if SMP 166 select GENERIC_CMOS_UPDATE 167 select GENERIC_CPU_AUTOPROBE 168 select GENERIC_CPU_VULNERABILITIES if PPC_BOOK3S_64 169 select GENERIC_IRQ_SHOW 170 select GENERIC_IRQ_SHOW_LEVEL 171 select GENERIC_SMP_IDLE_THREAD 172 select GENERIC_STRNCPY_FROM_USER 173 select GENERIC_STRNLEN_USER 174 select GENERIC_TIME_VSYSCALL 175 select HAVE_ARCH_AUDITSYSCALL 176 select HAVE_ARCH_JUMP_LABEL 177 select HAVE_ARCH_KGDB 178 select HAVE_ARCH_MMAP_RND_BITS 179 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT 180 select HAVE_ARCH_SECCOMP_FILTER 181 select HAVE_ARCH_TRACEHOOK 182 select HAVE_CBPF_JIT if !PPC64 183 select HAVE_CONTEXT_TRACKING if PPC64 184 select HAVE_DEBUG_KMEMLEAK 185 select HAVE_DEBUG_STACKOVERFLOW 186 select HAVE_DYNAMIC_FTRACE 187 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL 188 select HAVE_EBPF_JIT if PPC64 189 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU) 190 select HAVE_FTRACE_MCOUNT_RECORD 191 select HAVE_FUNCTION_GRAPH_TRACER 192 select HAVE_FUNCTION_TRACER 193 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC 194 select HAVE_GENERIC_GUP 195 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx) 196 select HAVE_IDE 197 select HAVE_IOREMAP_PROT 198 select HAVE_IRQ_EXIT_ON_IRQ_STACK 199 select HAVE_KERNEL_GZIP 200 select HAVE_KPROBES 201 select HAVE_KPROBES_ON_FTRACE 202 select HAVE_KRETPROBES 203 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION 204 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS 205 select HAVE_MEMBLOCK 206 select HAVE_MEMBLOCK_NODE_MAP 207 select HAVE_MOD_ARCH_SPECIFIC 208 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S) 209 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S) 210 select HAVE_OPROFILE 211 select HAVE_OPTPROBES if PPC64 212 select HAVE_PERF_EVENTS 213 select HAVE_PERF_EVENTS_NMI if PPC64 214 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH 215 select HAVE_PERF_REGS 216 select HAVE_PERF_USER_STACK_DUMP 217 select HAVE_RCU_TABLE_FREE if SMP 218 select HAVE_REGS_AND_STACK_ACCESS_API 219 select HAVE_RELIABLE_STACKTRACE if PPC64 && CPU_LITTLE_ENDIAN 220 select HAVE_SYSCALL_TRACEPOINTS 221 select HAVE_VIRT_CPU_ACCOUNTING 222 select HAVE_IRQ_TIME_ACCOUNTING 223 select HAVE_RSEQ 224 select IOMMU_HELPER if PPC64 225 select IRQ_DOMAIN 226 select IRQ_FORCED_THREADING 227 select MODULES_USE_ELF_RELA 228 select NEED_SG_DMA_LENGTH 229 select NO_BOOTMEM 230 select OF 231 select OF_EARLY_FLATTREE 232 select OF_RESERVED_MEM 233 select OLD_SIGACTION if PPC32 234 select OLD_SIGSUSPEND 235 select RTC_LIB 236 select SPARSE_IRQ 237 select SYSCTL_EXCEPTION_TRACE 238 select VIRT_TO_BUS if !PPC64 239 # 240 # Please keep this list sorted alphabetically. 241 # 242 243config GENERIC_CSUM 244 def_bool n 245 246config EARLY_PRINTK 247 bool 248 default y 249 250config PANIC_TIMEOUT 251 int 252 default 180 253 254config COMPAT 255 bool 256 default y if PPC64 257 select COMPAT_BINFMT_ELF 258 select ARCH_WANT_OLD_COMPAT_IPC 259 select COMPAT_OLD_SIGACTION 260 261config SYSVIPC_COMPAT 262 bool 263 depends on COMPAT && SYSVIPC 264 default y 265 266# All PPC32s use generic nvram driver through ppc_md 267config GENERIC_NVRAM 268 bool 269 default y if PPC32 270 271config SCHED_OMIT_FRAME_POINTER 272 bool 273 default y 274 275config ARCH_MAY_HAVE_PC_FDC 276 bool 277 default PCI 278 279config PPC_UDBG_16550 280 bool 281 default n 282 283config GENERIC_TBSYNC 284 bool 285 default y if PPC32 && SMP 286 default n 287 288config AUDIT_ARCH 289 bool 290 default y 291 292config GENERIC_BUG 293 bool 294 default y 295 depends on BUG 296 297config SYS_SUPPORTS_APM_EMULATION 298 default y if PMAC_APM_EMU 299 bool 300 301config EPAPR_BOOT 302 bool 303 help 304 Used to allow a board to specify it wants an ePAPR compliant wrapper. 305 default n 306 307config DEFAULT_UIMAGE 308 bool 309 help 310 Used to allow a board to specify it wants a uImage built by default 311 default n 312 313config ARCH_HIBERNATION_POSSIBLE 314 bool 315 default y 316 317config ARCH_SUSPEND_POSSIBLE 318 def_bool y 319 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \ 320 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \ 321 || 44x || 40x 322 323config PPC_DCR_NATIVE 324 bool 325 default n 326 327config PPC_DCR_MMIO 328 bool 329 default n 330 331config PPC_DCR 332 bool 333 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO 334 default y 335 336config PPC_OF_PLATFORM_PCI 337 bool 338 depends on PCI 339 depends on PPC64 # not supported on 32 bits yet 340 default n 341 342config ARCH_SUPPORTS_DEBUG_PAGEALLOC 343 depends on PPC32 || PPC_BOOK3S_64 344 def_bool y 345 346config ARCH_SUPPORTS_UPROBES 347 def_bool y 348 349config PPC_ADV_DEBUG_REGS 350 bool 351 depends on 40x || BOOKE 352 default y 353 354config PPC_ADV_DEBUG_IACS 355 int 356 depends on PPC_ADV_DEBUG_REGS 357 default 4 if 44x 358 default 2 359 360config PPC_ADV_DEBUG_DACS 361 int 362 depends on PPC_ADV_DEBUG_REGS 363 default 2 364 365config PPC_ADV_DEBUG_DVCS 366 int 367 depends on PPC_ADV_DEBUG_REGS 368 default 2 if 44x 369 default 0 370 371config PPC_ADV_DEBUG_DAC_RANGE 372 bool 373 depends on PPC_ADV_DEBUG_REGS && 44x 374 default y 375 376config ZONE_DMA32 377 bool 378 default y if PPC64 379 380config PGTABLE_LEVELS 381 int 382 default 2 if !PPC64 383 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64 384 default 4 385 386source "init/Kconfig" 387 388source "kernel/Kconfig.freezer" 389 390source "arch/powerpc/sysdev/Kconfig" 391source "arch/powerpc/platforms/Kconfig" 392 393menu "Kernel options" 394 395config HIGHMEM 396 bool "High memory support" 397 depends on PPC32 398 399source kernel/Kconfig.hz 400source kernel/Kconfig.preempt 401source "fs/Kconfig.binfmt" 402 403config HUGETLB_PAGE_SIZE_VARIABLE 404 bool 405 depends on HUGETLB_PAGE 406 default y 407 408config MATH_EMULATION 409 bool "Math emulation" 410 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE 411 ---help--- 412 Some PowerPC chips designed for embedded applications do not have 413 a floating-point unit and therefore do not implement the 414 floating-point instructions in the PowerPC instruction set. If you 415 say Y here, the kernel will include code to emulate a floating-point 416 unit, which will allow programs that use floating-point 417 instructions to run. 418 419 This is also useful to emulate missing (optional) instructions 420 such as fsqrt on cores that do have an FPU but do not implement 421 them (such as Freescale BookE). 422 423choice 424 prompt "Math emulation options" 425 default MATH_EMULATION_FULL 426 depends on MATH_EMULATION 427 428config MATH_EMULATION_FULL 429 bool "Emulate all the floating point instructions" 430 ---help--- 431 Select this option will enable the kernel to support to emulate 432 all the floating point instructions. If your SoC doesn't have 433 a FPU, you should select this. 434 435config MATH_EMULATION_HW_UNIMPLEMENTED 436 bool "Just emulate the FPU unimplemented instructions" 437 ---help--- 438 Select this if you know there does have a hardware FPU on your 439 SoC, but some floating point instructions are not implemented by that. 440 441endchoice 442 443config PPC_TRANSACTIONAL_MEM 444 bool "Transactional Memory support for POWERPC" 445 depends on PPC_BOOK3S_64 446 depends on SMP 447 select ALTIVEC 448 select VSX 449 default n 450 ---help--- 451 Support user-mode Transactional Memory on POWERPC. 452 453config LD_HEAD_STUB_CATCH 454 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT 455 depends on PPC64 456 default n 457 help 458 Very large kernels can cause linker branch stubs to be generated by 459 code in head_64.S, which moves the head text sections out of their 460 specified location. This option can work around the problem. 461 462 If unsure, say "N". 463 464config MPROFILE_KERNEL 465 depends on PPC64 && CPU_LITTLE_ENDIAN 466 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__) 467 468config HOTPLUG_CPU 469 bool "Support for enabling/disabling CPUs" 470 depends on SMP && (PPC_PSERIES || \ 471 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE) 472 ---help--- 473 Say Y here to be able to disable and re-enable individual 474 CPUs at runtime on SMP machines. 475 476 Say N if you are unsure. 477 478config ARCH_CPU_PROBE_RELEASE 479 def_bool y 480 depends on HOTPLUG_CPU 481 482config ARCH_ENABLE_MEMORY_HOTPLUG 483 def_bool y 484 485config ARCH_HAS_WALK_MEMORY 486 def_bool y 487 488config ARCH_ENABLE_MEMORY_HOTREMOVE 489 def_bool y 490 491config PPC64_SUPPORTS_MEMORY_FAILURE 492 bool "Add support for memory hwpoison" 493 depends on PPC_BOOK3S_64 494 default "y" if PPC_POWERNV 495 select ARCH_SUPPORTS_MEMORY_FAILURE 496 497config KEXEC 498 bool "kexec system call" 499 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E 500 select KEXEC_CORE 501 help 502 kexec is a system call that implements the ability to shutdown your 503 current kernel, and to start another kernel. It is like a reboot 504 but it is independent of the system firmware. And like a reboot 505 you can start any kernel with it, not just Linux. 506 507 The name comes from the similarity to the exec system call. 508 509 It is an ongoing process to be certain the hardware in a machine 510 is properly shutdown, so do not be surprised if this code does not 511 initially work for you. As of this writing the exact hardware 512 interface is strongly in flux, so no good recommendation can be 513 made. 514 515config KEXEC_FILE 516 bool "kexec file based system call" 517 select KEXEC_CORE 518 select HAVE_IMA_KEXEC 519 select BUILD_BIN2C 520 depends on PPC64 521 depends on CRYPTO=y 522 depends on CRYPTO_SHA256=y 523 help 524 This is a new version of the kexec system call. This call is 525 file based and takes in file descriptors as system call arguments 526 for kernel and initramfs as opposed to a list of segments as is the 527 case for the older kexec call. 528 529config ARCH_HAS_KEXEC_PURGATORY 530 def_bool KEXEC_FILE 531 532config RELOCATABLE 533 bool "Build a relocatable kernel" 534 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE)) 535 select NONSTATIC_KERNEL 536 select MODULE_REL_CRCS if MODVERSIONS 537 help 538 This builds a kernel image that is capable of running at the 539 location the kernel is loaded at. For ppc32, there is no any 540 alignment restrictions, and this feature is a superset of 541 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use 542 16k-aligned base address. The kernel is linked as a 543 position-independent executable (PIE) and contains dynamic relocations 544 which are processed early in the bootup process. 545 546 One use is for the kexec on panic case where the recovery kernel 547 must live at a different physical address than the primary 548 kernel. 549 550 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address 551 it has been loaded at and the compile time physical addresses 552 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START 553 setting can still be useful to bootwrappers that need to know the 554 load address of the kernel (eg. u-boot/mkimage). 555 556config RELOCATABLE_TEST 557 bool "Test relocatable kernel" 558 depends on (PPC64 && RELOCATABLE) 559 default n 560 help 561 This runs the relocatable kernel at the address it was initially 562 loaded at, which tends to be non-zero and therefore test the 563 relocation code. 564 565config CRASH_DUMP 566 bool "Build a dump capture kernel" 567 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP) 568 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE 569 help 570 Build a kernel suitable for use as a dump capture kernel. 571 The same kernel binary can be used as production kernel and dump 572 capture kernel. 573 574config FA_DUMP 575 bool "Firmware-assisted dump" 576 depends on PPC64 && PPC_RTAS 577 select CRASH_CORE 578 select CRASH_DUMP 579 help 580 A robust mechanism to get reliable kernel crash dump with 581 assistance from firmware. This approach does not use kexec, 582 instead firmware assists in booting the capture kernel 583 while preserving memory contents. Firmware-assisted dump 584 is meant to be a kdump replacement offering robustness and 585 speed not possible without system firmware assistance. 586 587 If unsure, say "N" 588 589config IRQ_ALL_CPUS 590 bool "Distribute interrupts on all CPUs by default" 591 depends on SMP 592 help 593 This option gives the kernel permission to distribute IRQs across 594 multiple CPUs. Saying N here will route all IRQs to the first 595 CPU. Generally saying Y is safe, although some problems have been 596 reported with SMP Power Macintoshes with this option enabled. 597 598config NUMA 599 bool "NUMA support" 600 depends on PPC64 601 default y if SMP && PPC_PSERIES 602 603config NODES_SHIFT 604 int 605 default "8" if PPC64 606 default "4" 607 depends on NEED_MULTIPLE_NODES 608 609config USE_PERCPU_NUMA_NODE_ID 610 def_bool y 611 depends on NUMA 612 613config HAVE_MEMORYLESS_NODES 614 def_bool y 615 depends on NUMA 616 617config ARCH_SELECT_MEMORY_MODEL 618 def_bool y 619 depends on PPC64 620 621config ARCH_FLATMEM_ENABLE 622 def_bool y 623 depends on (PPC64 && !NUMA) || PPC32 624 625config ARCH_SPARSEMEM_ENABLE 626 def_bool y 627 depends on PPC64 628 select SPARSEMEM_VMEMMAP_ENABLE 629 630config ARCH_SPARSEMEM_DEFAULT 631 def_bool y 632 depends on PPC_BOOK3S_64 633 634config SYS_SUPPORTS_HUGETLBFS 635 bool 636 637config ILLEGAL_POINTER_VALUE 638 hex 639 # This is roughly half way between the top of user space and the bottom 640 # of kernel space, which seems about as good as we can get. 641 default 0x5deadbeef0000000 if PPC64 642 default 0 643 644source "mm/Kconfig" 645 646config ARCH_MEMORY_PROBE 647 def_bool y 648 depends on MEMORY_HOTPLUG 649 650# Some NUMA nodes have memory ranges that span 651# other nodes. Even though a pfn is valid and 652# between a node's start and end pfns, it may not 653# reside on that node. See memmap_init_zone() 654# for details. 655config NODES_SPAN_OTHER_NODES 656 def_bool y 657 depends on NEED_MULTIPLE_NODES 658 659config STDBINUTILS 660 bool "Using standard binutils settings" 661 depends on 44x 662 default y 663 help 664 Turning this option off allows you to select 256KB PAGE_SIZE on 44x. 665 Note, that kernel will be able to run only those applications, 666 which had been compiled using binutils later than 2.17.50.0.3 with 667 '-zmax-page-size' set to 256K (the default is 64K). Or, if using 668 the older binutils, you can patch them with a trivial patch, which 669 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000. 670 671choice 672 prompt "Page size" 673 default PPC_4K_PAGES 674 help 675 Select the kernel logical page size. Increasing the page size 676 will reduce software overhead at each page boundary, allow 677 hardware prefetch mechanisms to be more effective, and allow 678 larger dma transfers increasing IO efficiency and reducing 679 overhead. However the utilization of memory will increase. 680 For example, each cached file will using a multiple of the 681 page size to hold its contents and the difference between the 682 end of file and the end of page is wasted. 683 684 Some dedicated systems, such as software raid serving with 685 accelerated calculations, have shown significant increases. 686 687 If you configure a 64 bit kernel for 64k pages but the 688 processor does not support them, then the kernel will simulate 689 them with 4k pages, loading them on demand, but with the 690 reduced software overhead and larger internal fragmentation. 691 For the 32 bit kernel, a large page option will not be offered 692 unless it is supported by the configured processor. 693 694 If unsure, choose 4K_PAGES. 695 696config PPC_4K_PAGES 697 bool "4k page size" 698 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 699 700config PPC_16K_PAGES 701 bool "16k page size" 702 depends on 44x || PPC_8xx 703 704config PPC_64K_PAGES 705 bool "64k page size" 706 depends on !PPC_FSL_BOOK3E && (44x || PPC_BOOK3S_64 || PPC_BOOK3E_64) 707 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 708 709config PPC_256K_PAGES 710 bool "256k page size" 711 depends on 44x && !STDBINUTILS 712 help 713 Make the page size 256k. 714 715 As the ELF standard only requires alignment to support page 716 sizes up to 64k, you will need to compile all of your user 717 space applications with a non-standard binutils settings 718 (see the STDBINUTILS description for details). 719 720 Say N unless you know what you are doing. 721 722endchoice 723 724config THREAD_SHIFT 725 int "Thread shift" if EXPERT 726 range 13 15 727 default "15" if PPC_256K_PAGES 728 default "14" if PPC64 729 default "13" 730 help 731 Used to define the stack size. The default is almost always what you 732 want. Only change this if you know what you are doing. 733 734config FORCE_MAX_ZONEORDER 735 int "Maximum zone order" 736 range 8 9 if PPC64 && PPC_64K_PAGES 737 default "9" if PPC64 && PPC_64K_PAGES 738 range 13 13 if PPC64 && !PPC_64K_PAGES 739 default "13" if PPC64 && !PPC_64K_PAGES 740 range 9 64 if PPC32 && PPC_16K_PAGES 741 default "9" if PPC32 && PPC_16K_PAGES 742 range 7 64 if PPC32 && PPC_64K_PAGES 743 default "7" if PPC32 && PPC_64K_PAGES 744 range 5 64 if PPC32 && PPC_256K_PAGES 745 default "5" if PPC32 && PPC_256K_PAGES 746 range 11 64 747 default "11" 748 help 749 The kernel memory allocator divides physically contiguous memory 750 blocks into "zones", where each zone is a power of two number of 751 pages. This option selects the largest power of two that the kernel 752 keeps in the memory allocator. If you need to allocate very large 753 blocks of physically contiguous memory, then you may need to 754 increase this value. 755 756 This config option is actually maximum order plus one. For example, 757 a value of 11 means that the largest free memory block is 2^10 pages. 758 759 The page size is not necessarily 4KB. For example, on 64-bit 760 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep 761 this in mind when choosing a value for this option. 762 763config PPC_SUBPAGE_PROT 764 bool "Support setting protections for 4k subpages" 765 depends on PPC_BOOK3S_64 && PPC_64K_PAGES 766 help 767 This option adds support for a system call to allow user programs 768 to set access permissions (read/write, readonly, or no access) 769 on the 4k subpages of each 64k page. 770 771config PPC_COPRO_BASE 772 bool 773 default n 774 775config SCHED_SMT 776 bool "SMT (Hyperthreading) scheduler support" 777 depends on PPC64 && SMP 778 help 779 SMT scheduler support improves the CPU scheduler's decision making 780 when dealing with POWER5 cpus at a cost of slightly increased 781 overhead in some places. If unsure say N here. 782 783config PPC_DENORMALISATION 784 bool "PowerPC denormalisation exception handling" 785 depends on PPC_BOOK3S_64 786 default "y" if PPC_POWERNV 787 ---help--- 788 Add support for handling denormalisation of single precision 789 values. Useful for bare metal only. If unsure say Y here. 790 791config CMDLINE_BOOL 792 bool "Default bootloader kernel arguments" 793 794config CMDLINE 795 string "Initial kernel command string" 796 depends on CMDLINE_BOOL 797 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" 798 help 799 On some platforms, there is currently no way for the boot loader to 800 pass arguments to the kernel. For these platforms, you can supply 801 some command-line options at build time by entering them here. In 802 most cases you will need to specify the root device here. 803 804config CMDLINE_FORCE 805 bool "Always use the default kernel command string" 806 depends on CMDLINE_BOOL 807 help 808 Always use the default kernel command string, even if the boot 809 loader passes other arguments to the kernel. 810 This is useful if you cannot or don't want to change the 811 command-line options your boot loader passes to the kernel. 812 813config EXTRA_TARGETS 814 string "Additional default image types" 815 help 816 List additional targets to be built by the bootwrapper here (separated 817 by spaces). This is useful for targets that depend of device tree 818 files in the .dts directory. 819 820 Targets in this list will be build as part of the default build 821 target, or when the user does a 'make zImage' or a 822 'make zImage.initrd'. 823 824 If unsure, leave blank 825 826config ARCH_WANTS_FREEZER_CONTROL 827 def_bool y 828 depends on ADB_PMU 829 830source kernel/power/Kconfig 831 832config SECCOMP 833 bool "Enable seccomp to safely compute untrusted bytecode" 834 depends on PROC_FS 835 default y 836 help 837 This kernel feature is useful for number crunching applications 838 that may need to compute untrusted bytecode during their 839 execution. By using pipes or other transports made available to 840 the process as file descriptors supporting the read/write 841 syscalls, it's possible to isolate those applications in 842 their own address space using seccomp. Once seccomp is 843 enabled via /proc/<pid>/seccomp, it cannot be disabled 844 and the task is only allowed to execute a few safe syscalls 845 defined by each seccomp mode. 846 847 If unsure, say Y. Only embedded should say N here. 848 849config PPC_MEM_KEYS 850 prompt "PowerPC Memory Protection Keys" 851 def_bool y 852 depends on PPC_BOOK3S_64 853 select ARCH_USES_HIGH_VMA_FLAGS 854 select ARCH_HAS_PKEYS 855 help 856 Memory Protection Keys provides a mechanism for enforcing 857 page-based protections, but without requiring modification of the 858 page tables when an application changes protection domains. 859 860 For details, see Documentation/vm/protection-keys.rst 861 862 If unsure, say y. 863 864endmenu 865 866config ISA_DMA_API 867 bool 868 default PCI 869 870menu "Bus options" 871 872config ISA 873 bool "Support for ISA-bus hardware" 874 depends on PPC_CHRP 875 select PPC_I8259 876 help 877 Find out whether you have ISA slots on your motherboard. ISA is the 878 name of a bus system, i.e. the way the CPU talks to the other stuff 879 inside your box. If you have an Apple machine, say N here; if you 880 have an IBM RS/6000 or pSeries machine, say Y. If you have an 881 embedded board, consult your board documentation. 882 883config ZONE_DMA 884 bool 885 default y 886 887config NEED_DMA_MAP_STATE 888 def_bool (PPC64 || NOT_COHERENT_CACHE) 889 890config GENERIC_ISA_DMA 891 bool 892 depends on ISA_DMA_API 893 default y 894 895config PPC_INDIRECT_PCI 896 bool 897 depends on PCI 898 default y if 40x || 44x 899 default n 900 901config EISA 902 bool 903 904config SBUS 905 bool 906 907config FSL_SOC 908 bool 909 910config FSL_PCI 911 bool 912 select PPC_INDIRECT_PCI 913 select PCI_QUIRKS 914 915config FSL_PMC 916 bool 917 default y 918 depends on SUSPEND && (PPC_85xx || PPC_86xx) 919 help 920 Freescale MPC85xx/MPC86xx power management controller support 921 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c 922 923config PPC4xx_CPM 924 bool 925 default y 926 depends on SUSPEND && (44x || 40x) 927 help 928 PPC4xx Clock Power Management (CPM) support (suspend/resume). 929 It also enables support for two different idle states (idle-wait 930 and idle-doze). 931 932config 4xx_SOC 933 bool 934 935config FSL_LBC 936 bool "Freescale Local Bus support" 937 help 938 Enables reporting of errors from the Freescale local bus 939 controller. Also contains some common code used by 940 drivers for specific local bus peripherals. 941 942config FSL_GTM 943 bool 944 depends on PPC_83xx || QUICC_ENGINE || CPM2 945 help 946 Freescale General-purpose Timers support 947 948# Yes MCA RS/6000s exist but Linux-PPC does not currently support any 949config MCA 950 bool 951 952# Platforms that what PCI turned unconditionally just do select PCI 953# in their config node. Platforms that want to choose at config 954# time should select PPC_PCI_CHOICE 955config PPC_PCI_CHOICE 956 bool 957 958config PCI 959 bool "PCI support" if PPC_PCI_CHOICE 960 default y if !40x && !CPM2 && !PPC_8xx && !PPC_83xx \ 961 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON 962 default PCI_QSPAN if PPC_8xx 963 select GENERIC_PCI_IOMAP 964 help 965 Find out whether your system includes a PCI bus. PCI is the name of 966 a bus system, i.e. the way the CPU talks to the other stuff inside 967 your box. If you say Y here, the kernel will include drivers and 968 infrastructure code to support PCI bus devices. 969 970config PCI_DOMAINS 971 def_bool PCI 972 973config PCI_SYSCALL 974 def_bool PCI 975 976config PCI_QSPAN 977 bool "QSpan PCI" 978 depends on PPC_8xx 979 select PPC_I8259 980 help 981 Say Y here if you have a system based on a Motorola 8xx-series 982 embedded processor with a QSPAN PCI interface, otherwise say N. 983 984config PCI_8260 985 bool 986 depends on PCI && 8260 987 select PPC_INDIRECT_PCI 988 default y 989 990source "drivers/pci/Kconfig" 991 992source "drivers/pcmcia/Kconfig" 993 994config HAS_RAPIDIO 995 bool 996 default n 997 998config RAPIDIO 999 tristate "RapidIO support" 1000 depends on HAS_RAPIDIO || PCI 1001 help 1002 If you say Y here, the kernel will include drivers and 1003 infrastructure code to support RapidIO interconnect devices. 1004 1005config FSL_RIO 1006 bool "Freescale Embedded SRIO Controller support" 1007 depends on RAPIDIO = y && HAS_RAPIDIO 1008 default "n" 1009 ---help--- 1010 Include support for RapidIO controller on Freescale embedded 1011 processors (MPC8548, MPC8641, etc). 1012 1013source "drivers/rapidio/Kconfig" 1014 1015endmenu 1016 1017config NONSTATIC_KERNEL 1018 bool 1019 default n 1020 1021menu "Advanced setup" 1022 depends on PPC32 1023 1024config ADVANCED_OPTIONS 1025 bool "Prompt for advanced kernel configuration options" 1026 help 1027 This option will enable prompting for a variety of advanced kernel 1028 configuration options. These options can cause the kernel to not 1029 work if they are set incorrectly, but can be used to optimize certain 1030 aspects of kernel memory management. 1031 1032 Unless you know what you are doing, say N here. 1033 1034comment "Default settings for advanced configuration options are used" 1035 depends on !ADVANCED_OPTIONS 1036 1037config LOWMEM_SIZE_BOOL 1038 bool "Set maximum low memory" 1039 depends on ADVANCED_OPTIONS 1040 help 1041 This option allows you to set the maximum amount of memory which 1042 will be used as "low memory", that is, memory which the kernel can 1043 access directly, without having to set up a kernel virtual mapping. 1044 This can be useful in optimizing the layout of kernel virtual 1045 memory. 1046 1047 Say N here unless you know what you are doing. 1048 1049config LOWMEM_SIZE 1050 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL 1051 default "0x30000000" 1052 1053config LOWMEM_CAM_NUM_BOOL 1054 bool "Set number of CAMs to use to map low memory" 1055 depends on ADVANCED_OPTIONS && FSL_BOOKE 1056 help 1057 This option allows you to set the maximum number of CAM slots that 1058 will be used to map low memory. There are a limited number of slots 1059 available and even more limited number that will fit in the L1 MMU. 1060 However, using more entries will allow mapping more low memory. This 1061 can be useful in optimizing the layout of kernel virtual memory. 1062 1063 Say N here unless you know what you are doing. 1064 1065config LOWMEM_CAM_NUM 1066 depends on FSL_BOOKE 1067 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL 1068 default 3 1069 1070config DYNAMIC_MEMSTART 1071 bool "Enable page aligned dynamic load address for kernel" 1072 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x) 1073 select NONSTATIC_KERNEL 1074 help 1075 This option enables the kernel to be loaded at any page aligned 1076 physical address. The kernel creates a mapping from KERNELBASE to 1077 the address where the kernel is loaded. The page size here implies 1078 the TLB page size of the mapping for kernel on the particular platform. 1079 Please refer to the init code for finding the TLB page size. 1080 1081 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE 1082 kernel image, where the only restriction is the page aligned kernel 1083 load address. When this option is enabled, the compile time physical 1084 address CONFIG_PHYSICAL_START is ignored. 1085 1086 This option is overridden by CONFIG_RELOCATABLE 1087 1088config PAGE_OFFSET_BOOL 1089 bool "Set custom page offset address" 1090 depends on ADVANCED_OPTIONS 1091 help 1092 This option allows you to set the kernel virtual address at which 1093 the kernel will map low memory. This can be useful in optimizing 1094 the virtual memory layout of the system. 1095 1096 Say N here unless you know what you are doing. 1097 1098config PAGE_OFFSET 1099 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL 1100 default "0xc0000000" 1101 1102config KERNEL_START_BOOL 1103 bool "Set custom kernel base address" 1104 depends on ADVANCED_OPTIONS 1105 help 1106 This option allows you to set the kernel virtual address at which 1107 the kernel will be loaded. Normally this should match PAGE_OFFSET 1108 however there are times (like kdump) that one might not want them 1109 to be the same. 1110 1111 Say N here unless you know what you are doing. 1112 1113config KERNEL_START 1114 hex "Virtual address of kernel base" if KERNEL_START_BOOL 1115 default PAGE_OFFSET if PAGE_OFFSET_BOOL 1116 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL 1117 default "0xc0000000" 1118 1119config PHYSICAL_START_BOOL 1120 bool "Set physical address where the kernel is loaded" 1121 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE 1122 help 1123 This gives the physical address where the kernel is loaded. 1124 1125 Say N here unless you know what you are doing. 1126 1127config PHYSICAL_START 1128 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL 1129 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL 1130 default "0x00000000" 1131 1132config PHYSICAL_ALIGN 1133 hex 1134 default "0x04000000" if FSL_BOOKE 1135 help 1136 This value puts the alignment restrictions on physical address 1137 where kernel is loaded and run from. Kernel is compiled for an 1138 address which meets above alignment restriction. 1139 1140config TASK_SIZE_BOOL 1141 bool "Set custom user task size" 1142 depends on ADVANCED_OPTIONS 1143 help 1144 This option allows you to set the amount of virtual address space 1145 allocated to user tasks. This can be useful in optimizing the 1146 virtual memory layout of the system. 1147 1148 Say N here unless you know what you are doing. 1149 1150config TASK_SIZE 1151 hex "Size of user task space" if TASK_SIZE_BOOL 1152 default "0x80000000" if PPC_8xx 1153 default "0xc0000000" 1154 1155config CONSISTENT_SIZE_BOOL 1156 bool "Set custom consistent memory pool size" 1157 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE 1158 help 1159 This option allows you to set the size of the 1160 consistent memory pool. This pool of virtual memory 1161 is used to make consistent memory allocations. 1162 1163config CONSISTENT_SIZE 1164 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL 1165 default "0x00200000" if NOT_COHERENT_CACHE 1166 1167config PIN_TLB 1168 bool "Pinned Kernel TLBs (860 ONLY)" 1169 depends on ADVANCED_OPTIONS && PPC_8xx && \ 1170 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX 1171 1172config PIN_TLB_DATA 1173 bool "Pinned TLB for DATA" 1174 depends on PIN_TLB 1175 default y 1176 1177config PIN_TLB_IMMR 1178 bool "Pinned TLB for IMMR" 1179 depends on PIN_TLB 1180 default y 1181 1182config PIN_TLB_TEXT 1183 bool "Pinned TLB for TEXT" 1184 depends on PIN_TLB 1185 default y 1186endmenu 1187 1188if PPC64 1189# This value must have zeroes in the bottom 60 bits otherwise lots will break 1190config PAGE_OFFSET 1191 hex 1192 default "0xc000000000000000" 1193config KERNEL_START 1194 hex 1195 default "0xc000000000000000" 1196config PHYSICAL_START 1197 hex 1198 default "0x00000000" 1199endif 1200 1201config ARCH_RANDOM 1202 def_bool n 1203 1204source "net/Kconfig" 1205 1206source "drivers/Kconfig" 1207 1208source "fs/Kconfig" 1209 1210source "lib/Kconfig" 1211 1212source "arch/powerpc/Kconfig.debug" 1213 1214source "security/Kconfig" 1215 1216source "crypto/Kconfig" 1217 1218config PPC_LIB_RHEAP 1219 bool 1220 1221source "arch/powerpc/kvm/Kconfig" 1222 1223source "kernel/livepatch/Kconfig" 1224