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_DEBUG_VIRTUAL 132 select ARCH_HAS_DEVMEM_IS_ALLOWED 133 select ARCH_HAS_DMA_SET_COHERENT_MASK 134 select ARCH_HAS_ELF_RANDOMIZE 135 select ARCH_HAS_FORTIFY_SOURCE 136 select ARCH_HAS_GCOV_PROFILE_ALL 137 select ARCH_HAS_PHYS_TO_DMA 138 select ARCH_HAS_PMEM_API if PPC64 139 select ARCH_HAS_PTE_SPECIAL 140 select ARCH_HAS_MEMBARRIER_CALLBACKS 141 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC64 142 select ARCH_HAS_SG_CHAIN 143 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION) 144 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 145 select ARCH_HAS_UACCESS_FLUSHCACHE if PPC64 146 select ARCH_HAS_UBSAN_SANITIZE_ALL 147 select ARCH_HAS_ZONE_DEVICE if PPC_BOOK3S_64 148 select ARCH_HAVE_NMI_SAFE_CMPXCHG 149 select ARCH_MIGHT_HAVE_PC_PARPORT 150 select ARCH_MIGHT_HAVE_PC_SERIO 151 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX 152 select ARCH_SUPPORTS_ATOMIC_RMW 153 select ARCH_USE_BUILTIN_BSWAP 154 select ARCH_USE_CMPXCHG_LOCKREF if PPC64 155 select ARCH_WANT_IPC_PARSE_VERSION 156 select ARCH_WEAK_RELEASE_ACQUIRE 157 select BINFMT_ELF 158 select BUILDTIME_EXTABLE_SORT 159 select CLONE_BACKWARDS 160 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN 161 select DYNAMIC_FTRACE if FUNCTION_TRACER 162 select EDAC_ATOMIC_SCRUB 163 select EDAC_SUPPORT 164 select GENERIC_ATOMIC64 if PPC32 165 select GENERIC_CLOCKEVENTS 166 select GENERIC_CLOCKEVENTS_BROADCAST if SMP 167 select GENERIC_CMOS_UPDATE 168 select GENERIC_CPU_AUTOPROBE 169 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC 170 select GENERIC_IRQ_SHOW 171 select GENERIC_IRQ_SHOW_LEVEL 172 select GENERIC_SMP_IDLE_THREAD 173 select GENERIC_STRNCPY_FROM_USER 174 select GENERIC_STRNLEN_USER 175 select GENERIC_TIME_VSYSCALL 176 select HAVE_ARCH_AUDITSYSCALL 177 select HAVE_ARCH_JUMP_LABEL 178 select HAVE_ARCH_KGDB 179 select HAVE_ARCH_MMAP_RND_BITS 180 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT 181 select HAVE_ARCH_SECCOMP_FILTER 182 select HAVE_ARCH_TRACEHOOK 183 select HAVE_CBPF_JIT if !PPC64 184 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13) 185 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2) 186 select HAVE_CONTEXT_TRACKING if PPC64 187 select HAVE_DEBUG_KMEMLEAK 188 select HAVE_DEBUG_STACKOVERFLOW 189 select HAVE_DYNAMIC_FTRACE 190 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL 191 select HAVE_EBPF_JIT if PPC64 192 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU) 193 select HAVE_FTRACE_MCOUNT_RECORD 194 select HAVE_FUNCTION_ERROR_INJECTION 195 select HAVE_FUNCTION_GRAPH_TRACER 196 select HAVE_FUNCTION_TRACER 197 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC 198 select HAVE_GENERIC_GUP 199 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx) 200 select HAVE_IDE 201 select HAVE_IOREMAP_PROT 202 select HAVE_IRQ_EXIT_ON_IRQ_STACK 203 select HAVE_KERNEL_GZIP 204 select HAVE_KERNEL_XZ if PPC_BOOK3S 205 select HAVE_KPROBES 206 select HAVE_KPROBES_ON_FTRACE 207 select HAVE_KRETPROBES 208 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION 209 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS 210 select HAVE_MEMBLOCK_NODE_MAP 211 select HAVE_MOD_ARCH_SPECIFIC 212 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S) 213 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S) 214 select HAVE_OPROFILE 215 select HAVE_OPTPROBES if PPC64 216 select HAVE_PERF_EVENTS 217 select HAVE_PERF_EVENTS_NMI if PPC64 218 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH 219 select HAVE_PERF_REGS 220 select HAVE_PERF_USER_STACK_DUMP 221 select HAVE_RCU_TABLE_FREE if SMP 222 select HAVE_REGS_AND_STACK_ACCESS_API 223 select HAVE_RELIABLE_STACKTRACE if PPC64 && CPU_LITTLE_ENDIAN 224 select HAVE_SYSCALL_TRACEPOINTS 225 select HAVE_VIRT_CPU_ACCOUNTING 226 select HAVE_IRQ_TIME_ACCOUNTING 227 select HAVE_RSEQ 228 select IOMMU_HELPER if PPC64 229 select IRQ_DOMAIN 230 select IRQ_FORCED_THREADING 231 select MODULES_USE_ELF_RELA 232 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE 233 select NEED_SG_DMA_LENGTH 234 select OF 235 select OF_EARLY_FLATTREE 236 select OF_RESERVED_MEM 237 select OLD_SIGACTION if PPC32 238 select OLD_SIGSUSPEND 239 select RTC_LIB 240 select SPARSE_IRQ 241 select SYSCTL_EXCEPTION_TRACE 242 select VIRT_TO_BUS if !PPC64 243 # 244 # Please keep this list sorted alphabetically. 245 # 246 247config PPC_BARRIER_NOSPEC 248 bool 249 default y 250 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E 251 252config GENERIC_CSUM 253 def_bool n 254 255config EARLY_PRINTK 256 bool 257 default y 258 259config PANIC_TIMEOUT 260 int 261 default 180 262 263config COMPAT 264 bool 265 default y if PPC64 266 select COMPAT_BINFMT_ELF 267 select ARCH_WANT_OLD_COMPAT_IPC 268 select COMPAT_OLD_SIGACTION 269 270config SYSVIPC_COMPAT 271 bool 272 depends on COMPAT && SYSVIPC 273 default y 274 275# All PPC32s use generic nvram driver through ppc_md 276config GENERIC_NVRAM 277 bool 278 default y if PPC32 279 280config SCHED_OMIT_FRAME_POINTER 281 bool 282 default y 283 284config ARCH_MAY_HAVE_PC_FDC 285 bool 286 default PCI 287 288config PPC_UDBG_16550 289 bool 290 291config GENERIC_TBSYNC 292 bool 293 default y if PPC32 && SMP 294 295config AUDIT_ARCH 296 bool 297 default y 298 299config GENERIC_BUG 300 bool 301 default y 302 depends on BUG 303 304config SYS_SUPPORTS_APM_EMULATION 305 default y if PMAC_APM_EMU 306 bool 307 308config EPAPR_BOOT 309 bool 310 help 311 Used to allow a board to specify it wants an ePAPR compliant wrapper. 312 313config DEFAULT_UIMAGE 314 bool 315 help 316 Used to allow a board to specify it wants a uImage built by default 317 318config ARCH_HIBERNATION_POSSIBLE 319 bool 320 default y 321 322config ARCH_SUSPEND_POSSIBLE 323 def_bool y 324 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \ 325 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \ 326 || 44x || 40x 327 328config PPC_DCR_NATIVE 329 bool 330 331config PPC_DCR_MMIO 332 bool 333 334config PPC_DCR 335 bool 336 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO 337 default y 338 339config PPC_OF_PLATFORM_PCI 340 bool 341 depends on PCI 342 depends on PPC64 # not supported on 32 bits yet 343 344config ARCH_SUPPORTS_DEBUG_PAGEALLOC 345 depends on PPC32 || PPC_BOOK3S_64 346 def_bool y 347 348config ARCH_SUPPORTS_UPROBES 349 def_bool y 350 351config PPC_ADV_DEBUG_REGS 352 bool 353 depends on 40x || BOOKE 354 default y 355 356config PPC_ADV_DEBUG_IACS 357 int 358 depends on PPC_ADV_DEBUG_REGS 359 default 4 if 44x 360 default 2 361 362config PPC_ADV_DEBUG_DACS 363 int 364 depends on PPC_ADV_DEBUG_REGS 365 default 2 366 367config PPC_ADV_DEBUG_DVCS 368 int 369 depends on PPC_ADV_DEBUG_REGS 370 default 2 if 44x 371 default 0 372 373config PPC_ADV_DEBUG_DAC_RANGE 374 bool 375 depends on PPC_ADV_DEBUG_REGS && 44x 376 default y 377 378config ZONE_DMA 379 bool 380 default y if PPC_BOOK3E_64 381 382config PGTABLE_LEVELS 383 int 384 default 2 if !PPC64 385 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64 386 default 4 387 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 398 399config HUGETLB_PAGE_SIZE_VARIABLE 400 bool 401 depends on HUGETLB_PAGE 402 default y 403 404config MATH_EMULATION 405 bool "Math emulation" 406 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE 407 ---help--- 408 Some PowerPC chips designed for embedded applications do not have 409 a floating-point unit and therefore do not implement the 410 floating-point instructions in the PowerPC instruction set. If you 411 say Y here, the kernel will include code to emulate a floating-point 412 unit, which will allow programs that use floating-point 413 instructions to run. 414 415 This is also useful to emulate missing (optional) instructions 416 such as fsqrt on cores that do have an FPU but do not implement 417 them (such as Freescale BookE). 418 419choice 420 prompt "Math emulation options" 421 default MATH_EMULATION_FULL 422 depends on MATH_EMULATION 423 424config MATH_EMULATION_FULL 425 bool "Emulate all the floating point instructions" 426 ---help--- 427 Select this option will enable the kernel to support to emulate 428 all the floating point instructions. If your SoC doesn't have 429 a FPU, you should select this. 430 431config MATH_EMULATION_HW_UNIMPLEMENTED 432 bool "Just emulate the FPU unimplemented instructions" 433 ---help--- 434 Select this if you know there does have a hardware FPU on your 435 SoC, but some floating point instructions are not implemented by that. 436 437endchoice 438 439config PPC_TRANSACTIONAL_MEM 440 bool "Transactional Memory support for POWERPC" 441 depends on PPC_BOOK3S_64 442 depends on SMP 443 select ALTIVEC 444 select VSX 445 ---help--- 446 Support user-mode Transactional Memory on POWERPC. 447 448config LD_HEAD_STUB_CATCH 449 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT 450 depends on PPC64 451 help 452 Very large kernels can cause linker branch stubs to be generated by 453 code in head_64.S, which moves the head text sections out of their 454 specified location. This option can work around the problem. 455 456 If unsure, say "N". 457 458config MPROFILE_KERNEL 459 depends on PPC64 && CPU_LITTLE_ENDIAN 460 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__) 461 462config HOTPLUG_CPU 463 bool "Support for enabling/disabling CPUs" 464 depends on SMP && (PPC_PSERIES || \ 465 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE) 466 ---help--- 467 Say Y here to be able to disable and re-enable individual 468 CPUs at runtime on SMP machines. 469 470 Say N if you are unsure. 471 472config ARCH_CPU_PROBE_RELEASE 473 def_bool y 474 depends on HOTPLUG_CPU 475 476config ARCH_ENABLE_MEMORY_HOTPLUG 477 def_bool y 478 479config ARCH_HAS_WALK_MEMORY 480 def_bool y 481 482config ARCH_ENABLE_MEMORY_HOTREMOVE 483 def_bool y 484 485config PPC64_SUPPORTS_MEMORY_FAILURE 486 bool "Add support for memory hwpoison" 487 depends on PPC_BOOK3S_64 488 default "y" if PPC_POWERNV 489 select ARCH_SUPPORTS_MEMORY_FAILURE 490 491config KEXEC 492 bool "kexec system call" 493 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E 494 select KEXEC_CORE 495 help 496 kexec is a system call that implements the ability to shutdown your 497 current kernel, and to start another kernel. It is like a reboot 498 but it is independent of the system firmware. And like a reboot 499 you can start any kernel with it, not just Linux. 500 501 The name comes from the similarity to the exec system call. 502 503 It is an ongoing process to be certain the hardware in a machine 504 is properly shutdown, so do not be surprised if this code does not 505 initially work for you. As of this writing the exact hardware 506 interface is strongly in flux, so no good recommendation can be 507 made. 508 509config KEXEC_FILE 510 bool "kexec file based system call" 511 select KEXEC_CORE 512 select HAVE_IMA_KEXEC 513 select BUILD_BIN2C 514 depends on PPC64 515 depends on CRYPTO=y 516 depends on CRYPTO_SHA256=y 517 help 518 This is a new version of the kexec system call. This call is 519 file based and takes in file descriptors as system call arguments 520 for kernel and initramfs as opposed to a list of segments as is the 521 case for the older kexec call. 522 523config ARCH_HAS_KEXEC_PURGATORY 524 def_bool KEXEC_FILE 525 526config RELOCATABLE 527 bool "Build a relocatable kernel" 528 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE)) 529 select NONSTATIC_KERNEL 530 select MODULE_REL_CRCS if MODVERSIONS 531 help 532 This builds a kernel image that is capable of running at the 533 location the kernel is loaded at. For ppc32, there is no any 534 alignment restrictions, and this feature is a superset of 535 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use 536 16k-aligned base address. The kernel is linked as a 537 position-independent executable (PIE) and contains dynamic relocations 538 which are processed early in the bootup process. 539 540 One use is for the kexec on panic case where the recovery kernel 541 must live at a different physical address than the primary 542 kernel. 543 544 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address 545 it has been loaded at and the compile time physical addresses 546 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START 547 setting can still be useful to bootwrappers that need to know the 548 load address of the kernel (eg. u-boot/mkimage). 549 550config RELOCATABLE_TEST 551 bool "Test relocatable kernel" 552 depends on (PPC64 && RELOCATABLE) 553 help 554 This runs the relocatable kernel at the address it was initially 555 loaded at, which tends to be non-zero and therefore test the 556 relocation code. 557 558config CRASH_DUMP 559 bool "Build a dump capture kernel" 560 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP) 561 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE 562 help 563 Build a kernel suitable for use as a dump capture kernel. 564 The same kernel binary can be used as production kernel and dump 565 capture kernel. 566 567config FA_DUMP 568 bool "Firmware-assisted dump" 569 depends on PPC64 && PPC_RTAS 570 select CRASH_CORE 571 select CRASH_DUMP 572 help 573 A robust mechanism to get reliable kernel crash dump with 574 assistance from firmware. This approach does not use kexec, 575 instead firmware assists in booting the capture kernel 576 while preserving memory contents. Firmware-assisted dump 577 is meant to be a kdump replacement offering robustness and 578 speed not possible without system firmware assistance. 579 580 If unsure, say "N" 581 582config IRQ_ALL_CPUS 583 bool "Distribute interrupts on all CPUs by default" 584 depends on SMP 585 help 586 This option gives the kernel permission to distribute IRQs across 587 multiple CPUs. Saying N here will route all IRQs to the first 588 CPU. Generally saying Y is safe, although some problems have been 589 reported with SMP Power Macintoshes with this option enabled. 590 591config NUMA 592 bool "NUMA support" 593 depends on PPC64 594 default y if SMP && PPC_PSERIES 595 596config NODES_SHIFT 597 int 598 default "8" if PPC64 599 default "4" 600 depends on NEED_MULTIPLE_NODES 601 602config USE_PERCPU_NUMA_NODE_ID 603 def_bool y 604 depends on NUMA 605 606config HAVE_MEMORYLESS_NODES 607 def_bool y 608 depends on NUMA 609 610config ARCH_SELECT_MEMORY_MODEL 611 def_bool y 612 depends on PPC64 613 614config ARCH_FLATMEM_ENABLE 615 def_bool y 616 depends on (PPC64 && !NUMA) || PPC32 617 618config ARCH_SPARSEMEM_ENABLE 619 def_bool y 620 depends on PPC64 621 select SPARSEMEM_VMEMMAP_ENABLE 622 623config ARCH_SPARSEMEM_DEFAULT 624 def_bool y 625 depends on PPC_BOOK3S_64 626 627config SYS_SUPPORTS_HUGETLBFS 628 bool 629 630config ILLEGAL_POINTER_VALUE 631 hex 632 # This is roughly half way between the top of user space and the bottom 633 # of kernel space, which seems about as good as we can get. 634 default 0x5deadbeef0000000 if PPC64 635 default 0 636 637config ARCH_MEMORY_PROBE 638 def_bool y 639 depends on MEMORY_HOTPLUG 640 641# Some NUMA nodes have memory ranges that span 642# other nodes. Even though a pfn is valid and 643# between a node's start and end pfns, it may not 644# reside on that node. See memmap_init_zone() 645# for details. 646config NODES_SPAN_OTHER_NODES 647 def_bool y 648 depends on NEED_MULTIPLE_NODES 649 650config STDBINUTILS 651 bool "Using standard binutils settings" 652 depends on 44x 653 default y 654 help 655 Turning this option off allows you to select 256KB PAGE_SIZE on 44x. 656 Note, that kernel will be able to run only those applications, 657 which had been compiled using binutils later than 2.17.50.0.3 with 658 '-zmax-page-size' set to 256K (the default is 64K). Or, if using 659 the older binutils, you can patch them with a trivial patch, which 660 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000. 661 662choice 663 prompt "Page size" 664 default PPC_4K_PAGES 665 help 666 Select the kernel logical page size. Increasing the page size 667 will reduce software overhead at each page boundary, allow 668 hardware prefetch mechanisms to be more effective, and allow 669 larger dma transfers increasing IO efficiency and reducing 670 overhead. However the utilization of memory will increase. 671 For example, each cached file will using a multiple of the 672 page size to hold its contents and the difference between the 673 end of file and the end of page is wasted. 674 675 Some dedicated systems, such as software raid serving with 676 accelerated calculations, have shown significant increases. 677 678 If you configure a 64 bit kernel for 64k pages but the 679 processor does not support them, then the kernel will simulate 680 them with 4k pages, loading them on demand, but with the 681 reduced software overhead and larger internal fragmentation. 682 For the 32 bit kernel, a large page option will not be offered 683 unless it is supported by the configured processor. 684 685 If unsure, choose 4K_PAGES. 686 687config PPC_4K_PAGES 688 bool "4k page size" 689 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 690 691config PPC_16K_PAGES 692 bool "16k page size" 693 depends on 44x || PPC_8xx 694 695config PPC_64K_PAGES 696 bool "64k page size" 697 depends on !PPC_FSL_BOOK3E && (44x || PPC_BOOK3S_64 || PPC_BOOK3E_64) 698 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 699 700config PPC_256K_PAGES 701 bool "256k page size" 702 depends on 44x && !STDBINUTILS 703 help 704 Make the page size 256k. 705 706 As the ELF standard only requires alignment to support page 707 sizes up to 64k, you will need to compile all of your user 708 space applications with a non-standard binutils settings 709 (see the STDBINUTILS description for details). 710 711 Say N unless you know what you are doing. 712 713endchoice 714 715config THREAD_SHIFT 716 int "Thread shift" if EXPERT 717 range 13 15 718 default "15" if PPC_256K_PAGES 719 default "14" if PPC64 720 default "13" 721 help 722 Used to define the stack size. The default is almost always what you 723 want. Only change this if you know what you are doing. 724 725config FORCE_MAX_ZONEORDER 726 int "Maximum zone order" 727 range 8 9 if PPC64 && PPC_64K_PAGES 728 default "9" if PPC64 && PPC_64K_PAGES 729 range 13 13 if PPC64 && !PPC_64K_PAGES 730 default "13" if PPC64 && !PPC_64K_PAGES 731 range 9 64 if PPC32 && PPC_16K_PAGES 732 default "9" if PPC32 && PPC_16K_PAGES 733 range 7 64 if PPC32 && PPC_64K_PAGES 734 default "7" if PPC32 && PPC_64K_PAGES 735 range 5 64 if PPC32 && PPC_256K_PAGES 736 default "5" if PPC32 && PPC_256K_PAGES 737 range 11 64 738 default "11" 739 help 740 The kernel memory allocator divides physically contiguous memory 741 blocks into "zones", where each zone is a power of two number of 742 pages. This option selects the largest power of two that the kernel 743 keeps in the memory allocator. If you need to allocate very large 744 blocks of physically contiguous memory, then you may need to 745 increase this value. 746 747 This config option is actually maximum order plus one. For example, 748 a value of 11 means that the largest free memory block is 2^10 pages. 749 750 The page size is not necessarily 4KB. For example, on 64-bit 751 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep 752 this in mind when choosing a value for this option. 753 754config PPC_SUBPAGE_PROT 755 bool "Support setting protections for 4k subpages" 756 depends on PPC_BOOK3S_64 && PPC_64K_PAGES 757 help 758 This option adds support for a system call to allow user programs 759 to set access permissions (read/write, readonly, or no access) 760 on the 4k subpages of each 64k page. 761 762config PPC_COPRO_BASE 763 bool 764 765config SCHED_SMT 766 bool "SMT (Hyperthreading) scheduler support" 767 depends on PPC64 && SMP 768 help 769 SMT scheduler support improves the CPU scheduler's decision making 770 when dealing with POWER5 cpus at a cost of slightly increased 771 overhead in some places. If unsure say N here. 772 773config PPC_DENORMALISATION 774 bool "PowerPC denormalisation exception handling" 775 depends on PPC_BOOK3S_64 776 default "y" if PPC_POWERNV 777 ---help--- 778 Add support for handling denormalisation of single precision 779 values. Useful for bare metal only. If unsure say Y here. 780 781config CMDLINE_BOOL 782 bool "Default bootloader kernel arguments" 783 784config CMDLINE 785 string "Initial kernel command string" 786 depends on CMDLINE_BOOL 787 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" 788 help 789 On some platforms, there is currently no way for the boot loader to 790 pass arguments to the kernel. For these platforms, you can supply 791 some command-line options at build time by entering them here. In 792 most cases you will need to specify the root device here. 793 794config CMDLINE_FORCE 795 bool "Always use the default kernel command string" 796 depends on CMDLINE_BOOL 797 help 798 Always use the default kernel command string, even if the boot 799 loader passes other arguments to the kernel. 800 This is useful if you cannot or don't want to change the 801 command-line options your boot loader passes to the kernel. 802 803config EXTRA_TARGETS 804 string "Additional default image types" 805 help 806 List additional targets to be built by the bootwrapper here (separated 807 by spaces). This is useful for targets that depend of device tree 808 files in the .dts directory. 809 810 Targets in this list will be build as part of the default build 811 target, or when the user does a 'make zImage' or a 812 'make zImage.initrd'. 813 814 If unsure, leave blank 815 816config ARCH_WANTS_FREEZER_CONTROL 817 def_bool y 818 depends on ADB_PMU 819 820source kernel/power/Kconfig 821 822config SECCOMP 823 bool "Enable seccomp to safely compute untrusted bytecode" 824 depends on PROC_FS 825 default y 826 help 827 This kernel feature is useful for number crunching applications 828 that may need to compute untrusted bytecode during their 829 execution. By using pipes or other transports made available to 830 the process as file descriptors supporting the read/write 831 syscalls, it's possible to isolate those applications in 832 their own address space using seccomp. Once seccomp is 833 enabled via /proc/<pid>/seccomp, it cannot be disabled 834 and the task is only allowed to execute a few safe syscalls 835 defined by each seccomp mode. 836 837 If unsure, say Y. Only embedded should say N here. 838 839config PPC_MEM_KEYS 840 prompt "PowerPC Memory Protection Keys" 841 def_bool y 842 depends on PPC_BOOK3S_64 843 select ARCH_USES_HIGH_VMA_FLAGS 844 select ARCH_HAS_PKEYS 845 help 846 Memory Protection Keys provides a mechanism for enforcing 847 page-based protections, but without requiring modification of the 848 page tables when an application changes protection domains. 849 850 For details, see Documentation/vm/protection-keys.rst 851 852 If unsure, say y. 853 854endmenu 855 856config ISA_DMA_API 857 bool 858 default PCI 859 860menu "Bus options" 861 862config ISA 863 bool "Support for ISA-bus hardware" 864 depends on PPC_CHRP 865 select PPC_I8259 866 help 867 Find out whether you have ISA slots on your motherboard. ISA is the 868 name of a bus system, i.e. the way the CPU talks to the other stuff 869 inside your box. If you have an Apple machine, say N here; if you 870 have an IBM RS/6000 or pSeries machine, say Y. If you have an 871 embedded board, consult your board documentation. 872 873config GENERIC_ISA_DMA 874 bool 875 depends on ISA_DMA_API 876 default y 877 878config PPC_INDIRECT_PCI 879 bool 880 depends on PCI 881 default y if 40x || 44x 882 883config EISA 884 bool 885 886config SBUS 887 bool 888 889config FSL_SOC 890 bool 891 892config FSL_PCI 893 bool 894 select PPC_INDIRECT_PCI 895 select PCI_QUIRKS 896 897config FSL_PMC 898 bool 899 default y 900 depends on SUSPEND && (PPC_85xx || PPC_86xx) 901 help 902 Freescale MPC85xx/MPC86xx power management controller support 903 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c 904 905config PPC4xx_CPM 906 bool 907 default y 908 depends on SUSPEND && (44x || 40x) 909 help 910 PPC4xx Clock Power Management (CPM) support (suspend/resume). 911 It also enables support for two different idle states (idle-wait 912 and idle-doze). 913 914config 4xx_SOC 915 bool 916 917config FSL_LBC 918 bool "Freescale Local Bus support" 919 help 920 Enables reporting of errors from the Freescale local bus 921 controller. Also contains some common code used by 922 drivers for specific local bus peripherals. 923 924config FSL_GTM 925 bool 926 depends on PPC_83xx || QUICC_ENGINE || CPM2 927 help 928 Freescale General-purpose Timers support 929 930# Platforms that what PCI turned unconditionally just do select PCI 931# in their config node. Platforms that want to choose at config 932# time should select PPC_PCI_CHOICE 933config PPC_PCI_CHOICE 934 bool 935 936config PCI 937 bool "PCI support" if PPC_PCI_CHOICE 938 default y if !40x && !CPM2 && !PPC_8xx && !PPC_83xx \ 939 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON 940 select GENERIC_PCI_IOMAP 941 help 942 Find out whether your system includes a PCI bus. PCI is the name of 943 a bus system, i.e. the way the CPU talks to the other stuff inside 944 your box. If you say Y here, the kernel will include drivers and 945 infrastructure code to support PCI bus devices. 946 947config PCI_DOMAINS 948 def_bool PCI 949 950config PCI_SYSCALL 951 def_bool PCI 952 953config PCI_8260 954 bool 955 depends on PCI && 8260 956 select PPC_INDIRECT_PCI 957 default y 958 959source "drivers/pci/Kconfig" 960 961source "drivers/pcmcia/Kconfig" 962 963config HAS_RAPIDIO 964 bool 965 966config RAPIDIO 967 tristate "RapidIO support" 968 depends on HAS_RAPIDIO || PCI 969 help 970 If you say Y here, the kernel will include drivers and 971 infrastructure code to support RapidIO interconnect devices. 972 973config FSL_RIO 974 bool "Freescale Embedded SRIO Controller support" 975 depends on RAPIDIO = y && HAS_RAPIDIO 976 default "n" 977 ---help--- 978 Include support for RapidIO controller on Freescale embedded 979 processors (MPC8548, MPC8641, etc). 980 981source "drivers/rapidio/Kconfig" 982 983endmenu 984 985config NONSTATIC_KERNEL 986 bool 987 988menu "Advanced setup" 989 depends on PPC32 990 991config ADVANCED_OPTIONS 992 bool "Prompt for advanced kernel configuration options" 993 help 994 This option will enable prompting for a variety of advanced kernel 995 configuration options. These options can cause the kernel to not 996 work if they are set incorrectly, but can be used to optimize certain 997 aspects of kernel memory management. 998 999 Unless you know what you are doing, say N here. 1000 1001comment "Default settings for advanced configuration options are used" 1002 depends on !ADVANCED_OPTIONS 1003 1004config LOWMEM_SIZE_BOOL 1005 bool "Set maximum low memory" 1006 depends on ADVANCED_OPTIONS 1007 help 1008 This option allows you to set the maximum amount of memory which 1009 will be used as "low memory", that is, memory which the kernel can 1010 access directly, without having to set up a kernel virtual mapping. 1011 This can be useful in optimizing the layout of kernel virtual 1012 memory. 1013 1014 Say N here unless you know what you are doing. 1015 1016config LOWMEM_SIZE 1017 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL 1018 default "0x30000000" 1019 1020config LOWMEM_CAM_NUM_BOOL 1021 bool "Set number of CAMs to use to map low memory" 1022 depends on ADVANCED_OPTIONS && FSL_BOOKE 1023 help 1024 This option allows you to set the maximum number of CAM slots that 1025 will be used to map low memory. There are a limited number of slots 1026 available and even more limited number that will fit in the L1 MMU. 1027 However, using more entries will allow mapping more low memory. This 1028 can be useful in optimizing the layout of kernel virtual memory. 1029 1030 Say N here unless you know what you are doing. 1031 1032config LOWMEM_CAM_NUM 1033 depends on FSL_BOOKE 1034 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL 1035 default 3 1036 1037config DYNAMIC_MEMSTART 1038 bool "Enable page aligned dynamic load address for kernel" 1039 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x) 1040 select NONSTATIC_KERNEL 1041 help 1042 This option enables the kernel to be loaded at any page aligned 1043 physical address. The kernel creates a mapping from KERNELBASE to 1044 the address where the kernel is loaded. The page size here implies 1045 the TLB page size of the mapping for kernel on the particular platform. 1046 Please refer to the init code for finding the TLB page size. 1047 1048 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE 1049 kernel image, where the only restriction is the page aligned kernel 1050 load address. When this option is enabled, the compile time physical 1051 address CONFIG_PHYSICAL_START is ignored. 1052 1053 This option is overridden by CONFIG_RELOCATABLE 1054 1055config PAGE_OFFSET_BOOL 1056 bool "Set custom page offset address" 1057 depends on ADVANCED_OPTIONS 1058 help 1059 This option allows you to set the kernel virtual address at which 1060 the kernel will map low memory. This can be useful in optimizing 1061 the virtual memory layout of the system. 1062 1063 Say N here unless you know what you are doing. 1064 1065config PAGE_OFFSET 1066 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL 1067 default "0xc0000000" 1068 1069config KERNEL_START_BOOL 1070 bool "Set custom kernel base address" 1071 depends on ADVANCED_OPTIONS 1072 help 1073 This option allows you to set the kernel virtual address at which 1074 the kernel will be loaded. Normally this should match PAGE_OFFSET 1075 however there are times (like kdump) that one might not want them 1076 to be the same. 1077 1078 Say N here unless you know what you are doing. 1079 1080config KERNEL_START 1081 hex "Virtual address of kernel base" if KERNEL_START_BOOL 1082 default PAGE_OFFSET if PAGE_OFFSET_BOOL 1083 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL 1084 default "0xc0000000" 1085 1086config PHYSICAL_START_BOOL 1087 bool "Set physical address where the kernel is loaded" 1088 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE 1089 help 1090 This gives the physical address where the kernel is loaded. 1091 1092 Say N here unless you know what you are doing. 1093 1094config PHYSICAL_START 1095 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL 1096 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL 1097 default "0x00000000" 1098 1099config PHYSICAL_ALIGN 1100 hex 1101 default "0x04000000" if FSL_BOOKE 1102 help 1103 This value puts the alignment restrictions on physical address 1104 where kernel is loaded and run from. Kernel is compiled for an 1105 address which meets above alignment restriction. 1106 1107config TASK_SIZE_BOOL 1108 bool "Set custom user task size" 1109 depends on ADVANCED_OPTIONS 1110 help 1111 This option allows you to set the amount of virtual address space 1112 allocated to user tasks. This can be useful in optimizing the 1113 virtual memory layout of the system. 1114 1115 Say N here unless you know what you are doing. 1116 1117config TASK_SIZE 1118 hex "Size of user task space" if TASK_SIZE_BOOL 1119 default "0x80000000" if PPC_8xx 1120 default "0xc0000000" 1121 1122config CONSISTENT_SIZE_BOOL 1123 bool "Set custom consistent memory pool size" 1124 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE 1125 help 1126 This option allows you to set the size of the 1127 consistent memory pool. This pool of virtual memory 1128 is used to make consistent memory allocations. 1129 1130config CONSISTENT_SIZE 1131 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL 1132 default "0x00200000" if NOT_COHERENT_CACHE 1133 1134config PIN_TLB 1135 bool "Pinned Kernel TLBs (860 ONLY)" 1136 depends on ADVANCED_OPTIONS && PPC_8xx && \ 1137 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX 1138 1139config PIN_TLB_DATA 1140 bool "Pinned TLB for DATA" 1141 depends on PIN_TLB 1142 default y 1143 1144config PIN_TLB_IMMR 1145 bool "Pinned TLB for IMMR" 1146 depends on PIN_TLB || PPC_EARLY_DEBUG_CPM 1147 default y 1148 1149config PIN_TLB_TEXT 1150 bool "Pinned TLB for TEXT" 1151 depends on PIN_TLB 1152 default y 1153endmenu 1154 1155if PPC64 1156# This value must have zeroes in the bottom 60 bits otherwise lots will break 1157config PAGE_OFFSET 1158 hex 1159 default "0xc000000000000000" 1160config KERNEL_START 1161 hex 1162 default "0xc000000000000000" 1163config PHYSICAL_START 1164 hex 1165 default "0x00000000" 1166endif 1167 1168config ARCH_RANDOM 1169 def_bool n 1170 1171config PPC_LIB_RHEAP 1172 bool 1173 1174source "arch/powerpc/kvm/Kconfig" 1175 1176source "kernel/livepatch/Kconfig" 1177