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