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_MEMBARRIER_CALLBACKS 139 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE 140 select ARCH_HAS_SG_CHAIN 141 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION) 142 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 143 select ARCH_HAS_UACCESS_FLUSHCACHE if PPC64 144 select ARCH_HAS_UBSAN_SANITIZE_ALL 145 select ARCH_HAS_ZONE_DEVICE if PPC_BOOK3S_64 146 select ARCH_HAVE_NMI_SAFE_CMPXCHG 147 select ARCH_MIGHT_HAVE_PC_PARPORT 148 select ARCH_MIGHT_HAVE_PC_SERIO 149 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX 150 select ARCH_SUPPORTS_ATOMIC_RMW 151 select ARCH_USE_BUILTIN_BSWAP 152 select ARCH_USE_CMPXCHG_LOCKREF if PPC64 153 select ARCH_WANT_IPC_PARSE_VERSION 154 select ARCH_WEAK_RELEASE_ACQUIRE 155 select BINFMT_ELF 156 select BUILDTIME_EXTABLE_SORT 157 select CLONE_BACKWARDS 158 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN 159 select DYNAMIC_FTRACE if FUNCTION_TRACER 160 select EDAC_ATOMIC_SCRUB 161 select EDAC_SUPPORT 162 select GENERIC_ATOMIC64 if PPC32 163 select GENERIC_CLOCKEVENTS 164 select GENERIC_CLOCKEVENTS_BROADCAST if SMP 165 select GENERIC_CMOS_UPDATE 166 select GENERIC_CPU_AUTOPROBE 167 select GENERIC_CPU_VULNERABILITIES if PPC_BOOK3S_64 168 select GENERIC_IRQ_SHOW 169 select GENERIC_IRQ_SHOW_LEVEL 170 select GENERIC_SMP_IDLE_THREAD 171 select GENERIC_STRNCPY_FROM_USER 172 select GENERIC_STRNLEN_USER 173 select GENERIC_TIME_VSYSCALL 174 select HAVE_ARCH_AUDITSYSCALL 175 select HAVE_ARCH_JUMP_LABEL 176 select HAVE_ARCH_KGDB 177 select HAVE_ARCH_MMAP_RND_BITS 178 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT 179 select HAVE_ARCH_SECCOMP_FILTER 180 select HAVE_ARCH_TRACEHOOK 181 select HAVE_CBPF_JIT if !PPC64 182 select HAVE_CONTEXT_TRACKING if PPC64 183 select HAVE_DEBUG_KMEMLEAK 184 select HAVE_DEBUG_STACKOVERFLOW 185 select HAVE_DYNAMIC_FTRACE 186 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL 187 select HAVE_EBPF_JIT if PPC64 188 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU) 189 select HAVE_FTRACE_MCOUNT_RECORD 190 select HAVE_FUNCTION_GRAPH_TRACER 191 select HAVE_FUNCTION_TRACER 192 select HAVE_GCC_PLUGINS 193 select HAVE_GENERIC_GUP 194 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx) 195 select HAVE_IDE 196 select HAVE_IOREMAP_PROT 197 select HAVE_IRQ_EXIT_ON_IRQ_STACK 198 select HAVE_KERNEL_GZIP 199 select HAVE_KPROBES 200 select HAVE_KPROBES_ON_FTRACE 201 select HAVE_KRETPROBES 202 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION 203 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS 204 select HAVE_MEMBLOCK 205 select HAVE_MEMBLOCK_NODE_MAP 206 select HAVE_MOD_ARCH_SPECIFIC 207 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S) 208 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S) 209 select HAVE_OPROFILE 210 select HAVE_OPTPROBES if PPC64 211 select HAVE_PERF_EVENTS 212 select HAVE_PERF_EVENTS_NMI if PPC64 213 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH 214 select HAVE_PERF_REGS 215 select HAVE_PERF_USER_STACK_DUMP 216 select HAVE_RCU_TABLE_FREE if SMP 217 select HAVE_REGS_AND_STACK_ACCESS_API 218 select HAVE_RELIABLE_STACKTRACE if PPC64 && CPU_LITTLE_ENDIAN 219 select HAVE_SYSCALL_TRACEPOINTS 220 select HAVE_VIRT_CPU_ACCOUNTING 221 select HAVE_IRQ_TIME_ACCOUNTING 222 select IOMMU_HELPER if PPC64 223 select IRQ_DOMAIN 224 select IRQ_FORCED_THREADING 225 select MODULES_USE_ELF_RELA 226 select NEED_SG_DMA_LENGTH 227 select NO_BOOTMEM 228 select OF 229 select OF_EARLY_FLATTREE 230 select OF_RESERVED_MEM 231 select OLD_SIGACTION if PPC32 232 select OLD_SIGSUSPEND 233 select RTC_LIB 234 select SPARSE_IRQ 235 select SYSCTL_EXCEPTION_TRACE 236 select VIRT_TO_BUS if !PPC64 237 # 238 # Please keep this list sorted alphabetically. 239 # 240 241config GENERIC_CSUM 242 def_bool n 243 244config EARLY_PRINTK 245 bool 246 default y 247 248config PANIC_TIMEOUT 249 int 250 default 180 251 252config COMPAT 253 bool 254 default y if PPC64 255 select COMPAT_BINFMT_ELF 256 select ARCH_WANT_OLD_COMPAT_IPC 257 select COMPAT_OLD_SIGACTION 258 259config SYSVIPC_COMPAT 260 bool 261 depends on COMPAT && SYSVIPC 262 default y 263 264# All PPC32s use generic nvram driver through ppc_md 265config GENERIC_NVRAM 266 bool 267 default y if PPC32 268 269config SCHED_OMIT_FRAME_POINTER 270 bool 271 default y 272 273config ARCH_MAY_HAVE_PC_FDC 274 bool 275 default PCI 276 277config PPC_UDBG_16550 278 bool 279 default n 280 281config GENERIC_TBSYNC 282 bool 283 default y if PPC32 && SMP 284 default n 285 286config AUDIT_ARCH 287 bool 288 default y 289 290config GENERIC_BUG 291 bool 292 default y 293 depends on BUG 294 295config SYS_SUPPORTS_APM_EMULATION 296 default y if PMAC_APM_EMU 297 bool 298 299config EPAPR_BOOT 300 bool 301 help 302 Used to allow a board to specify it wants an ePAPR compliant wrapper. 303 default n 304 305config DEFAULT_UIMAGE 306 bool 307 help 308 Used to allow a board to specify it wants a uImage built by default 309 default n 310 311config ARCH_HIBERNATION_POSSIBLE 312 bool 313 default y 314 315config ARCH_SUSPEND_POSSIBLE 316 def_bool y 317 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \ 318 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \ 319 || 44x || 40x 320 321config PPC_DCR_NATIVE 322 bool 323 default n 324 325config PPC_DCR_MMIO 326 bool 327 default n 328 329config PPC_DCR 330 bool 331 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO 332 default y 333 334config PPC_OF_PLATFORM_PCI 335 bool 336 depends on PCI 337 depends on PPC64 # not supported on 32 bits yet 338 default n 339 340config ARCH_SUPPORTS_DEBUG_PAGEALLOC 341 depends on PPC32 || PPC_BOOK3S_64 342 def_bool y 343 344config ARCH_SUPPORTS_UPROBES 345 def_bool y 346 347config PPC_ADV_DEBUG_REGS 348 bool 349 depends on 40x || BOOKE 350 default y 351 352config PPC_ADV_DEBUG_IACS 353 int 354 depends on PPC_ADV_DEBUG_REGS 355 default 4 if 44x 356 default 2 357 358config PPC_ADV_DEBUG_DACS 359 int 360 depends on PPC_ADV_DEBUG_REGS 361 default 2 362 363config PPC_ADV_DEBUG_DVCS 364 int 365 depends on PPC_ADV_DEBUG_REGS 366 default 2 if 44x 367 default 0 368 369config PPC_ADV_DEBUG_DAC_RANGE 370 bool 371 depends on PPC_ADV_DEBUG_REGS && 44x 372 default y 373 374config ZONE_DMA32 375 bool 376 default y if PPC64 377 378config PGTABLE_LEVELS 379 int 380 default 2 if !PPC64 381 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64 382 default 4 383 384source "init/Kconfig" 385 386source "kernel/Kconfig.freezer" 387 388source "arch/powerpc/sysdev/Kconfig" 389source "arch/powerpc/platforms/Kconfig" 390 391menu "Kernel options" 392 393config HIGHMEM 394 bool "High memory support" 395 depends on PPC32 396 397source kernel/Kconfig.hz 398source kernel/Kconfig.preempt 399source "fs/Kconfig.binfmt" 400 401config HUGETLB_PAGE_SIZE_VARIABLE 402 bool 403 depends on HUGETLB_PAGE 404 default y 405 406config MATH_EMULATION 407 bool "Math emulation" 408 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE 409 ---help--- 410 Some PowerPC chips designed for embedded applications do not have 411 a floating-point unit and therefore do not implement the 412 floating-point instructions in the PowerPC instruction set. If you 413 say Y here, the kernel will include code to emulate a floating-point 414 unit, which will allow programs that use floating-point 415 instructions to run. 416 417 This is also useful to emulate missing (optional) instructions 418 such as fsqrt on cores that do have an FPU but do not implement 419 them (such as Freescale BookE). 420 421choice 422 prompt "Math emulation options" 423 default MATH_EMULATION_FULL 424 depends on MATH_EMULATION 425 426config MATH_EMULATION_FULL 427 bool "Emulate all the floating point instructions" 428 ---help--- 429 Select this option will enable the kernel to support to emulate 430 all the floating point instructions. If your SoC doesn't have 431 a FPU, you should select this. 432 433config MATH_EMULATION_HW_UNIMPLEMENTED 434 bool "Just emulate the FPU unimplemented instructions" 435 ---help--- 436 Select this if you know there does have a hardware FPU on your 437 SoC, but some floating point instructions are not implemented by that. 438 439endchoice 440 441config PPC_TRANSACTIONAL_MEM 442 bool "Transactional Memory support for POWERPC" 443 depends on PPC_BOOK3S_64 444 depends on SMP 445 select ALTIVEC 446 select VSX 447 default n 448 ---help--- 449 Support user-mode Transactional Memory on POWERPC. 450 451config LD_HEAD_STUB_CATCH 452 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT 453 depends on PPC64 454 default n 455 help 456 Very large kernels can cause linker branch stubs to be generated by 457 code in head_64.S, which moves the head text sections out of their 458 specified location. This option can work around the problem. 459 460 If unsure, say "N". 461 462config DISABLE_MPROFILE_KERNEL 463 bool "Disable use of mprofile-kernel for kernel tracing" 464 depends on PPC64 && CPU_LITTLE_ENDIAN 465 default y 466 help 467 Selecting this options disables use of the mprofile-kernel ABI for 468 kernel tracing. That will cause options such as live patching 469 (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to 470 be disabled also. 471 472 If you have a toolchain which supports mprofile-kernel, then you can 473 disable this. Otherwise leave it enabled. If you're not sure, say 474 "Y". 475 476config MPROFILE_KERNEL 477 depends on PPC64 && CPU_LITTLE_ENDIAN 478 def_bool !DISABLE_MPROFILE_KERNEL 479 480config HOTPLUG_CPU 481 bool "Support for enabling/disabling CPUs" 482 depends on SMP && (PPC_PSERIES || \ 483 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE) 484 ---help--- 485 Say Y here to be able to disable and re-enable individual 486 CPUs at runtime on SMP machines. 487 488 Say N if you are unsure. 489 490config ARCH_CPU_PROBE_RELEASE 491 def_bool y 492 depends on HOTPLUG_CPU 493 494config ARCH_ENABLE_MEMORY_HOTPLUG 495 def_bool y 496 497config ARCH_HAS_WALK_MEMORY 498 def_bool y 499 500config ARCH_ENABLE_MEMORY_HOTREMOVE 501 def_bool y 502 503config PPC64_SUPPORTS_MEMORY_FAILURE 504 bool "Add support for memory hwpoison" 505 depends on PPC_BOOK3S_64 506 default "y" if PPC_POWERNV 507 select ARCH_SUPPORTS_MEMORY_FAILURE 508 509config KEXEC 510 bool "kexec system call" 511 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E 512 select KEXEC_CORE 513 help 514 kexec is a system call that implements the ability to shutdown your 515 current kernel, and to start another kernel. It is like a reboot 516 but it is independent of the system firmware. And like a reboot 517 you can start any kernel with it, not just Linux. 518 519 The name comes from the similarity to the exec system call. 520 521 It is an ongoing process to be certain the hardware in a machine 522 is properly shutdown, so do not be surprised if this code does not 523 initially work for you. As of this writing the exact hardware 524 interface is strongly in flux, so no good recommendation can be 525 made. 526 527config KEXEC_FILE 528 bool "kexec file based system call" 529 select KEXEC_CORE 530 select HAVE_IMA_KEXEC 531 select BUILD_BIN2C 532 depends on PPC64 533 depends on CRYPTO=y 534 depends on CRYPTO_SHA256=y 535 help 536 This is a new version of the kexec system call. This call is 537 file based and takes in file descriptors as system call arguments 538 for kernel and initramfs as opposed to a list of segments as is the 539 case for the older kexec call. 540 541config ARCH_HAS_KEXEC_PURGATORY 542 def_bool KEXEC_FILE 543 544config RELOCATABLE 545 bool "Build a relocatable kernel" 546 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE)) 547 select NONSTATIC_KERNEL 548 select MODULE_REL_CRCS if MODVERSIONS 549 help 550 This builds a kernel image that is capable of running at the 551 location the kernel is loaded at. For ppc32, there is no any 552 alignment restrictions, and this feature is a superset of 553 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use 554 16k-aligned base address. The kernel is linked as a 555 position-independent executable (PIE) and contains dynamic relocations 556 which are processed early in the bootup process. 557 558 One use is for the kexec on panic case where the recovery kernel 559 must live at a different physical address than the primary 560 kernel. 561 562 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address 563 it has been loaded at and the compile time physical addresses 564 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START 565 setting can still be useful to bootwrappers that need to know the 566 load address of the kernel (eg. u-boot/mkimage). 567 568config RELOCATABLE_TEST 569 bool "Test relocatable kernel" 570 depends on (PPC64 && RELOCATABLE) 571 default n 572 help 573 This runs the relocatable kernel at the address it was initially 574 loaded at, which tends to be non-zero and therefore test the 575 relocation code. 576 577config CRASH_DUMP 578 bool "Build a dump capture kernel" 579 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP) 580 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE 581 help 582 Build a kernel suitable for use as a dump capture kernel. 583 The same kernel binary can be used as production kernel and dump 584 capture kernel. 585 586config FA_DUMP 587 bool "Firmware-assisted dump" 588 depends on PPC64 && PPC_RTAS 589 select CRASH_CORE 590 select CRASH_DUMP 591 help 592 A robust mechanism to get reliable kernel crash dump with 593 assistance from firmware. This approach does not use kexec, 594 instead firmware assists in booting the capture kernel 595 while preserving memory contents. Firmware-assisted dump 596 is meant to be a kdump replacement offering robustness and 597 speed not possible without system firmware assistance. 598 599 If unsure, say "N" 600 601config IRQ_ALL_CPUS 602 bool "Distribute interrupts on all CPUs by default" 603 depends on SMP 604 help 605 This option gives the kernel permission to distribute IRQs across 606 multiple CPUs. Saying N here will route all IRQs to the first 607 CPU. Generally saying Y is safe, although some problems have been 608 reported with SMP Power Macintoshes with this option enabled. 609 610config NUMA 611 bool "NUMA support" 612 depends on PPC64 613 default y if SMP && PPC_PSERIES 614 615config NODES_SHIFT 616 int 617 default "8" if PPC64 618 default "4" 619 depends on NEED_MULTIPLE_NODES 620 621config USE_PERCPU_NUMA_NODE_ID 622 def_bool y 623 depends on NUMA 624 625config HAVE_MEMORYLESS_NODES 626 def_bool y 627 depends on NUMA 628 629config ARCH_SELECT_MEMORY_MODEL 630 def_bool y 631 depends on PPC64 632 633config ARCH_FLATMEM_ENABLE 634 def_bool y 635 depends on (PPC64 && !NUMA) || PPC32 636 637config ARCH_SPARSEMEM_ENABLE 638 def_bool y 639 depends on PPC64 640 select SPARSEMEM_VMEMMAP_ENABLE 641 642config ARCH_SPARSEMEM_DEFAULT 643 def_bool y 644 depends on PPC_BOOK3S_64 645 646config SYS_SUPPORTS_HUGETLBFS 647 bool 648 649config ILLEGAL_POINTER_VALUE 650 hex 651 # This is roughly half way between the top of user space and the bottom 652 # of kernel space, which seems about as good as we can get. 653 default 0x5deadbeef0000000 if PPC64 654 default 0 655 656source "mm/Kconfig" 657 658config ARCH_MEMORY_PROBE 659 def_bool y 660 depends on MEMORY_HOTPLUG 661 662# Some NUMA nodes have memory ranges that span 663# other nodes. Even though a pfn is valid and 664# between a node's start and end pfns, it may not 665# reside on that node. See memmap_init_zone() 666# for details. 667config NODES_SPAN_OTHER_NODES 668 def_bool y 669 depends on NEED_MULTIPLE_NODES 670 671config STDBINUTILS 672 bool "Using standard binutils settings" 673 depends on 44x 674 default y 675 help 676 Turning this option off allows you to select 256KB PAGE_SIZE on 44x. 677 Note, that kernel will be able to run only those applications, 678 which had been compiled using binutils later than 2.17.50.0.3 with 679 '-zmax-page-size' set to 256K (the default is 64K). Or, if using 680 the older binutils, you can patch them with a trivial patch, which 681 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000. 682 683choice 684 prompt "Page size" 685 default PPC_4K_PAGES 686 help 687 Select the kernel logical page size. Increasing the page size 688 will reduce software overhead at each page boundary, allow 689 hardware prefetch mechanisms to be more effective, and allow 690 larger dma transfers increasing IO efficiency and reducing 691 overhead. However the utilization of memory will increase. 692 For example, each cached file will using a multiple of the 693 page size to hold its contents and the difference between the 694 end of file and the end of page is wasted. 695 696 Some dedicated systems, such as software raid serving with 697 accelerated calculations, have shown significant increases. 698 699 If you configure a 64 bit kernel for 64k pages but the 700 processor does not support them, then the kernel will simulate 701 them with 4k pages, loading them on demand, but with the 702 reduced software overhead and larger internal fragmentation. 703 For the 32 bit kernel, a large page option will not be offered 704 unless it is supported by the configured processor. 705 706 If unsure, choose 4K_PAGES. 707 708config PPC_4K_PAGES 709 bool "4k page size" 710 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 711 712config PPC_16K_PAGES 713 bool "16k page size" 714 depends on 44x || PPC_8xx 715 716config PPC_64K_PAGES 717 bool "64k page size" 718 depends on !PPC_FSL_BOOK3E && (44x || PPC_BOOK3S_64 || PPC_BOOK3E_64) 719 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 720 721config PPC_256K_PAGES 722 bool "256k page size" 723 depends on 44x && !STDBINUTILS 724 help 725 Make the page size 256k. 726 727 As the ELF standard only requires alignment to support page 728 sizes up to 64k, you will need to compile all of your user 729 space applications with a non-standard binutils settings 730 (see the STDBINUTILS description for details). 731 732 Say N unless you know what you are doing. 733 734endchoice 735 736config THREAD_SHIFT 737 int "Thread shift" if EXPERT 738 range 13 15 739 default "15" if PPC_256K_PAGES 740 default "14" if PPC64 741 default "13" 742 help 743 Used to define the stack size. The default is almost always what you 744 want. Only change this if you know what you are doing. 745 746config FORCE_MAX_ZONEORDER 747 int "Maximum zone order" 748 range 8 9 if PPC64 && PPC_64K_PAGES 749 default "9" if PPC64 && PPC_64K_PAGES 750 range 13 13 if PPC64 && !PPC_64K_PAGES 751 default "13" if PPC64 && !PPC_64K_PAGES 752 range 9 64 if PPC32 && PPC_16K_PAGES 753 default "9" if PPC32 && PPC_16K_PAGES 754 range 7 64 if PPC32 && PPC_64K_PAGES 755 default "7" if PPC32 && PPC_64K_PAGES 756 range 5 64 if PPC32 && PPC_256K_PAGES 757 default "5" if PPC32 && PPC_256K_PAGES 758 range 11 64 759 default "11" 760 help 761 The kernel memory allocator divides physically contiguous memory 762 blocks into "zones", where each zone is a power of two number of 763 pages. This option selects the largest power of two that the kernel 764 keeps in the memory allocator. If you need to allocate very large 765 blocks of physically contiguous memory, then you may need to 766 increase this value. 767 768 This config option is actually maximum order plus one. For example, 769 a value of 11 means that the largest free memory block is 2^10 pages. 770 771 The page size is not necessarily 4KB. For example, on 64-bit 772 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep 773 this in mind when choosing a value for this option. 774 775config PPC_SUBPAGE_PROT 776 bool "Support setting protections for 4k subpages" 777 depends on PPC_BOOK3S_64 && PPC_64K_PAGES 778 help 779 This option adds support for a system call to allow user programs 780 to set access permissions (read/write, readonly, or no access) 781 on the 4k subpages of each 64k page. 782 783config PPC_COPRO_BASE 784 bool 785 default n 786 787config SCHED_SMT 788 bool "SMT (Hyperthreading) scheduler support" 789 depends on PPC64 && SMP 790 help 791 SMT scheduler support improves the CPU scheduler's decision making 792 when dealing with POWER5 cpus at a cost of slightly increased 793 overhead in some places. If unsure say N here. 794 795config PPC_DENORMALISATION 796 bool "PowerPC denormalisation exception handling" 797 depends on PPC_BOOK3S_64 798 default "y" if PPC_POWERNV 799 ---help--- 800 Add support for handling denormalisation of single precision 801 values. Useful for bare metal only. If unsure say Y here. 802 803config CMDLINE_BOOL 804 bool "Default bootloader kernel arguments" 805 806config CMDLINE 807 string "Initial kernel command string" 808 depends on CMDLINE_BOOL 809 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" 810 help 811 On some platforms, there is currently no way for the boot loader to 812 pass arguments to the kernel. For these platforms, you can supply 813 some command-line options at build time by entering them here. In 814 most cases you will need to specify the root device here. 815 816config CMDLINE_FORCE 817 bool "Always use the default kernel command string" 818 depends on CMDLINE_BOOL 819 help 820 Always use the default kernel command string, even if the boot 821 loader passes other arguments to the kernel. 822 This is useful if you cannot or don't want to change the 823 command-line options your boot loader passes to the kernel. 824 825config EXTRA_TARGETS 826 string "Additional default image types" 827 help 828 List additional targets to be built by the bootwrapper here (separated 829 by spaces). This is useful for targets that depend of device tree 830 files in the .dts directory. 831 832 Targets in this list will be build as part of the default build 833 target, or when the user does a 'make zImage' or a 834 'make zImage.initrd'. 835 836 If unsure, leave blank 837 838config ARCH_WANTS_FREEZER_CONTROL 839 def_bool y 840 depends on ADB_PMU 841 842source kernel/power/Kconfig 843 844config SECCOMP 845 bool "Enable seccomp to safely compute untrusted bytecode" 846 depends on PROC_FS 847 default y 848 help 849 This kernel feature is useful for number crunching applications 850 that may need to compute untrusted bytecode during their 851 execution. By using pipes or other transports made available to 852 the process as file descriptors supporting the read/write 853 syscalls, it's possible to isolate those applications in 854 their own address space using seccomp. Once seccomp is 855 enabled via /proc/<pid>/seccomp, it cannot be disabled 856 and the task is only allowed to execute a few safe syscalls 857 defined by each seccomp mode. 858 859 If unsure, say Y. Only embedded should say N here. 860 861config PPC_MEM_KEYS 862 prompt "PowerPC Memory Protection Keys" 863 def_bool y 864 depends on PPC_BOOK3S_64 865 select ARCH_USES_HIGH_VMA_FLAGS 866 select ARCH_HAS_PKEYS 867 help 868 Memory Protection Keys provides a mechanism for enforcing 869 page-based protections, but without requiring modification of the 870 page tables when an application changes protection domains. 871 872 For details, see Documentation/vm/protection-keys.rst 873 874 If unsure, say y. 875 876endmenu 877 878config ISA_DMA_API 879 bool 880 default PCI 881 882menu "Bus options" 883 884config ISA 885 bool "Support for ISA-bus hardware" 886 depends on PPC_CHRP 887 select PPC_I8259 888 help 889 Find out whether you have ISA slots on your motherboard. ISA is the 890 name of a bus system, i.e. the way the CPU talks to the other stuff 891 inside your box. If you have an Apple machine, say N here; if you 892 have an IBM RS/6000 or pSeries machine, say Y. If you have an 893 embedded board, consult your board documentation. 894 895config ZONE_DMA 896 bool 897 default y 898 899config NEED_DMA_MAP_STATE 900 def_bool (PPC64 || NOT_COHERENT_CACHE) 901 902config GENERIC_ISA_DMA 903 bool 904 depends on ISA_DMA_API 905 default y 906 907config PPC_INDIRECT_PCI 908 bool 909 depends on PCI 910 default y if 40x || 44x 911 default n 912 913config EISA 914 bool 915 916config SBUS 917 bool 918 919config FSL_SOC 920 bool 921 922config FSL_PCI 923 bool 924 select PPC_INDIRECT_PCI 925 select PCI_QUIRKS 926 927config FSL_PMC 928 bool 929 default y 930 depends on SUSPEND && (PPC_85xx || PPC_86xx) 931 help 932 Freescale MPC85xx/MPC86xx power management controller support 933 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c 934 935config PPC4xx_CPM 936 bool 937 default y 938 depends on SUSPEND && (44x || 40x) 939 help 940 PPC4xx Clock Power Management (CPM) support (suspend/resume). 941 It also enables support for two different idle states (idle-wait 942 and idle-doze). 943 944config 4xx_SOC 945 bool 946 947config FSL_LBC 948 bool "Freescale Local Bus support" 949 help 950 Enables reporting of errors from the Freescale local bus 951 controller. Also contains some common code used by 952 drivers for specific local bus peripherals. 953 954config FSL_GTM 955 bool 956 depends on PPC_83xx || QUICC_ENGINE || CPM2 957 help 958 Freescale General-purpose Timers support 959 960# Yes MCA RS/6000s exist but Linux-PPC does not currently support any 961config MCA 962 bool 963 964# Platforms that what PCI turned unconditionally just do select PCI 965# in their config node. Platforms that want to choose at config 966# time should select PPC_PCI_CHOICE 967config PPC_PCI_CHOICE 968 bool 969 970config PCI 971 bool "PCI support" if PPC_PCI_CHOICE 972 default y if !40x && !CPM2 && !PPC_8xx && !PPC_83xx \ 973 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON 974 default PCI_QSPAN if PPC_8xx 975 select GENERIC_PCI_IOMAP 976 help 977 Find out whether your system includes a PCI bus. PCI is the name of 978 a bus system, i.e. the way the CPU talks to the other stuff inside 979 your box. If you say Y here, the kernel will include drivers and 980 infrastructure code to support PCI bus devices. 981 982config PCI_DOMAINS 983 def_bool PCI 984 985config PCI_SYSCALL 986 def_bool PCI 987 988config PCI_QSPAN 989 bool "QSpan PCI" 990 depends on PPC_8xx 991 select PPC_I8259 992 help 993 Say Y here if you have a system based on a Motorola 8xx-series 994 embedded processor with a QSPAN PCI interface, otherwise say N. 995 996config PCI_8260 997 bool 998 depends on PCI && 8260 999 select PPC_INDIRECT_PCI 1000 default y 1001 1002source "drivers/pci/Kconfig" 1003 1004source "drivers/pcmcia/Kconfig" 1005 1006config HAS_RAPIDIO 1007 bool 1008 default n 1009 1010config RAPIDIO 1011 tristate "RapidIO support" 1012 depends on HAS_RAPIDIO || PCI 1013 help 1014 If you say Y here, the kernel will include drivers and 1015 infrastructure code to support RapidIO interconnect devices. 1016 1017config FSL_RIO 1018 bool "Freescale Embedded SRIO Controller support" 1019 depends on RAPIDIO = y && HAS_RAPIDIO 1020 default "n" 1021 ---help--- 1022 Include support for RapidIO controller on Freescale embedded 1023 processors (MPC8548, MPC8641, etc). 1024 1025source "drivers/rapidio/Kconfig" 1026 1027endmenu 1028 1029config NONSTATIC_KERNEL 1030 bool 1031 default n 1032 1033menu "Advanced setup" 1034 depends on PPC32 1035 1036config ADVANCED_OPTIONS 1037 bool "Prompt for advanced kernel configuration options" 1038 help 1039 This option will enable prompting for a variety of advanced kernel 1040 configuration options. These options can cause the kernel to not 1041 work if they are set incorrectly, but can be used to optimize certain 1042 aspects of kernel memory management. 1043 1044 Unless you know what you are doing, say N here. 1045 1046comment "Default settings for advanced configuration options are used" 1047 depends on !ADVANCED_OPTIONS 1048 1049config LOWMEM_SIZE_BOOL 1050 bool "Set maximum low memory" 1051 depends on ADVANCED_OPTIONS 1052 help 1053 This option allows you to set the maximum amount of memory which 1054 will be used as "low memory", that is, memory which the kernel can 1055 access directly, without having to set up a kernel virtual mapping. 1056 This can be useful in optimizing the layout of kernel virtual 1057 memory. 1058 1059 Say N here unless you know what you are doing. 1060 1061config LOWMEM_SIZE 1062 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL 1063 default "0x30000000" 1064 1065config LOWMEM_CAM_NUM_BOOL 1066 bool "Set number of CAMs to use to map low memory" 1067 depends on ADVANCED_OPTIONS && FSL_BOOKE 1068 help 1069 This option allows you to set the maximum number of CAM slots that 1070 will be used to map low memory. There are a limited number of slots 1071 available and even more limited number that will fit in the L1 MMU. 1072 However, using more entries will allow mapping more low memory. This 1073 can be useful in optimizing the layout of kernel virtual memory. 1074 1075 Say N here unless you know what you are doing. 1076 1077config LOWMEM_CAM_NUM 1078 depends on FSL_BOOKE 1079 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL 1080 default 3 1081 1082config DYNAMIC_MEMSTART 1083 bool "Enable page aligned dynamic load address for kernel" 1084 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x) 1085 select NONSTATIC_KERNEL 1086 help 1087 This option enables the kernel to be loaded at any page aligned 1088 physical address. The kernel creates a mapping from KERNELBASE to 1089 the address where the kernel is loaded. The page size here implies 1090 the TLB page size of the mapping for kernel on the particular platform. 1091 Please refer to the init code for finding the TLB page size. 1092 1093 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE 1094 kernel image, where the only restriction is the page aligned kernel 1095 load address. When this option is enabled, the compile time physical 1096 address CONFIG_PHYSICAL_START is ignored. 1097 1098 This option is overridden by CONFIG_RELOCATABLE 1099 1100config PAGE_OFFSET_BOOL 1101 bool "Set custom page offset address" 1102 depends on ADVANCED_OPTIONS 1103 help 1104 This option allows you to set the kernel virtual address at which 1105 the kernel will map low memory. This can be useful in optimizing 1106 the virtual memory layout of the system. 1107 1108 Say N here unless you know what you are doing. 1109 1110config PAGE_OFFSET 1111 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL 1112 default "0xc0000000" 1113 1114config KERNEL_START_BOOL 1115 bool "Set custom kernel base address" 1116 depends on ADVANCED_OPTIONS 1117 help 1118 This option allows you to set the kernel virtual address at which 1119 the kernel will be loaded. Normally this should match PAGE_OFFSET 1120 however there are times (like kdump) that one might not want them 1121 to be the same. 1122 1123 Say N here unless you know what you are doing. 1124 1125config KERNEL_START 1126 hex "Virtual address of kernel base" if KERNEL_START_BOOL 1127 default PAGE_OFFSET if PAGE_OFFSET_BOOL 1128 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL 1129 default "0xc0000000" 1130 1131config PHYSICAL_START_BOOL 1132 bool "Set physical address where the kernel is loaded" 1133 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE 1134 help 1135 This gives the physical address where the kernel is loaded. 1136 1137 Say N here unless you know what you are doing. 1138 1139config PHYSICAL_START 1140 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL 1141 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL 1142 default "0x00000000" 1143 1144config PHYSICAL_ALIGN 1145 hex 1146 default "0x04000000" if FSL_BOOKE 1147 help 1148 This value puts the alignment restrictions on physical address 1149 where kernel is loaded and run from. Kernel is compiled for an 1150 address which meets above alignment restriction. 1151 1152config TASK_SIZE_BOOL 1153 bool "Set custom user task size" 1154 depends on ADVANCED_OPTIONS 1155 help 1156 This option allows you to set the amount of virtual address space 1157 allocated to user tasks. This can be useful in optimizing the 1158 virtual memory layout of the system. 1159 1160 Say N here unless you know what you are doing. 1161 1162config TASK_SIZE 1163 hex "Size of user task space" if TASK_SIZE_BOOL 1164 default "0x80000000" if PPC_8xx 1165 default "0xc0000000" 1166 1167config CONSISTENT_SIZE_BOOL 1168 bool "Set custom consistent memory pool size" 1169 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE 1170 help 1171 This option allows you to set the size of the 1172 consistent memory pool. This pool of virtual memory 1173 is used to make consistent memory allocations. 1174 1175config CONSISTENT_SIZE 1176 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL 1177 default "0x00200000" if NOT_COHERENT_CACHE 1178 1179config PIN_TLB 1180 bool "Pinned Kernel TLBs (860 ONLY)" 1181 depends on ADVANCED_OPTIONS && PPC_8xx && \ 1182 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX 1183 1184config PIN_TLB_DATA 1185 bool "Pinned TLB for DATA" 1186 depends on PIN_TLB 1187 default y 1188 1189config PIN_TLB_IMMR 1190 bool "Pinned TLB for IMMR" 1191 depends on PIN_TLB 1192 default y 1193 1194config PIN_TLB_TEXT 1195 bool "Pinned TLB for TEXT" 1196 depends on PIN_TLB 1197 default y 1198endmenu 1199 1200if PPC64 1201# This value must have zeroes in the bottom 60 bits otherwise lots will break 1202config PAGE_OFFSET 1203 hex 1204 default "0xc000000000000000" 1205config KERNEL_START 1206 hex 1207 default "0xc000000000000000" 1208config PHYSICAL_START 1209 hex 1210 default "0x00000000" 1211endif 1212 1213config ARCH_RANDOM 1214 def_bool n 1215 1216source "net/Kconfig" 1217 1218source "drivers/Kconfig" 1219 1220source "fs/Kconfig" 1221 1222source "lib/Kconfig" 1223 1224source "arch/powerpc/Kconfig.debug" 1225 1226source "security/Kconfig" 1227 1228source "crypto/Kconfig" 1229 1230config PPC_LIB_RHEAP 1231 bool 1232 1233source "arch/powerpc/kvm/Kconfig" 1234 1235source "kernel/livepatch/Kconfig" 1236