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 && PPC64 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_BARRIER_NOSPEC 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_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13) 184 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2) 185 select HAVE_CONTEXT_TRACKING if PPC64 186 select HAVE_DEBUG_KMEMLEAK 187 select HAVE_DEBUG_STACKOVERFLOW 188 select HAVE_DYNAMIC_FTRACE 189 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL 190 select HAVE_EBPF_JIT if PPC64 191 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU) 192 select HAVE_FTRACE_MCOUNT_RECORD 193 select HAVE_FUNCTION_ERROR_INJECTION 194 select HAVE_FUNCTION_GRAPH_TRACER 195 select HAVE_FUNCTION_TRACER 196 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC 197 select HAVE_GENERIC_GUP 198 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx) 199 select HAVE_IDE 200 select HAVE_IOREMAP_PROT 201 select HAVE_IRQ_EXIT_ON_IRQ_STACK 202 select HAVE_KERNEL_GZIP 203 select HAVE_KERNEL_XZ if PPC_BOOK3S 204 select HAVE_KPROBES 205 select HAVE_KPROBES_ON_FTRACE 206 select HAVE_KRETPROBES 207 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION 208 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS 209 select HAVE_MEMBLOCK_NODE_MAP 210 select HAVE_MOD_ARCH_SPECIFIC 211 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S) 212 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S) 213 select HAVE_OPROFILE 214 select HAVE_OPTPROBES if PPC64 215 select HAVE_PERF_EVENTS 216 select HAVE_PERF_EVENTS_NMI if PPC64 217 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH 218 select HAVE_PERF_REGS 219 select HAVE_PERF_USER_STACK_DUMP 220 select HAVE_RCU_TABLE_FREE if SMP 221 select HAVE_REGS_AND_STACK_ACCESS_API 222 select HAVE_RELIABLE_STACKTRACE if PPC64 && CPU_LITTLE_ENDIAN 223 select HAVE_SYSCALL_TRACEPOINTS 224 select HAVE_VIRT_CPU_ACCOUNTING 225 select HAVE_IRQ_TIME_ACCOUNTING 226 select HAVE_RSEQ 227 select IOMMU_HELPER if PPC64 228 select IRQ_DOMAIN 229 select IRQ_FORCED_THREADING 230 select MODULES_USE_ELF_RELA 231 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE 232 select NEED_SG_DMA_LENGTH 233 select OF 234 select OF_EARLY_FLATTREE 235 select OF_RESERVED_MEM 236 select OLD_SIGACTION if PPC32 237 select OLD_SIGSUSPEND 238 select RTC_LIB 239 select SPARSE_IRQ 240 select SYSCTL_EXCEPTION_TRACE 241 select VIRT_TO_BUS if !PPC64 242 # 243 # Please keep this list sorted alphabetically. 244 # 245 246config PPC_BARRIER_NOSPEC 247 bool 248 default y 249 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E 250 251config GENERIC_CSUM 252 def_bool n 253 254config EARLY_PRINTK 255 bool 256 default y 257 258config PANIC_TIMEOUT 259 int 260 default 180 261 262config COMPAT 263 bool 264 default y if PPC64 265 select COMPAT_BINFMT_ELF 266 select ARCH_WANT_OLD_COMPAT_IPC 267 select COMPAT_OLD_SIGACTION 268 269config SYSVIPC_COMPAT 270 bool 271 depends on COMPAT && SYSVIPC 272 default y 273 274# All PPC32s use generic nvram driver through ppc_md 275config GENERIC_NVRAM 276 bool 277 default y if PPC32 278 279config SCHED_OMIT_FRAME_POINTER 280 bool 281 default y 282 283config ARCH_MAY_HAVE_PC_FDC 284 bool 285 default PCI 286 287config PPC_UDBG_16550 288 bool 289 290config GENERIC_TBSYNC 291 bool 292 default y if PPC32 && SMP 293 294config AUDIT_ARCH 295 bool 296 default y 297 298config GENERIC_BUG 299 bool 300 default y 301 depends on BUG 302 303config SYS_SUPPORTS_APM_EMULATION 304 default y if PMAC_APM_EMU 305 bool 306 307config EPAPR_BOOT 308 bool 309 help 310 Used to allow a board to specify it wants an ePAPR compliant wrapper. 311 312config DEFAULT_UIMAGE 313 bool 314 help 315 Used to allow a board to specify it wants a uImage built by default 316 317config ARCH_HIBERNATION_POSSIBLE 318 bool 319 default y 320 321config ARCH_SUSPEND_POSSIBLE 322 def_bool y 323 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \ 324 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \ 325 || 44x || 40x 326 327config PPC_DCR_NATIVE 328 bool 329 330config PPC_DCR_MMIO 331 bool 332 333config PPC_DCR 334 bool 335 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO 336 default y 337 338config PPC_OF_PLATFORM_PCI 339 bool 340 depends on PCI 341 depends on PPC64 # not supported on 32 bits yet 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 "arch/powerpc/sysdev/Kconfig" 388source "arch/powerpc/platforms/Kconfig" 389 390menu "Kernel options" 391 392config HIGHMEM 393 bool "High memory support" 394 depends on PPC32 395 396source kernel/Kconfig.hz 397 398config HUGETLB_PAGE_SIZE_VARIABLE 399 bool 400 depends on HUGETLB_PAGE 401 default y 402 403config MATH_EMULATION 404 bool "Math emulation" 405 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE 406 ---help--- 407 Some PowerPC chips designed for embedded applications do not have 408 a floating-point unit and therefore do not implement the 409 floating-point instructions in the PowerPC instruction set. If you 410 say Y here, the kernel will include code to emulate a floating-point 411 unit, which will allow programs that use floating-point 412 instructions to run. 413 414 This is also useful to emulate missing (optional) instructions 415 such as fsqrt on cores that do have an FPU but do not implement 416 them (such as Freescale BookE). 417 418choice 419 prompt "Math emulation options" 420 default MATH_EMULATION_FULL 421 depends on MATH_EMULATION 422 423config MATH_EMULATION_FULL 424 bool "Emulate all the floating point instructions" 425 ---help--- 426 Select this option will enable the kernel to support to emulate 427 all the floating point instructions. If your SoC doesn't have 428 a FPU, you should select this. 429 430config MATH_EMULATION_HW_UNIMPLEMENTED 431 bool "Just emulate the FPU unimplemented instructions" 432 ---help--- 433 Select this if you know there does have a hardware FPU on your 434 SoC, but some floating point instructions are not implemented by that. 435 436endchoice 437 438config PPC_TRANSACTIONAL_MEM 439 bool "Transactional Memory support for POWERPC" 440 depends on PPC_BOOK3S_64 441 depends on SMP 442 select ALTIVEC 443 select VSX 444 ---help--- 445 Support user-mode Transactional Memory on POWERPC. 446 447config LD_HEAD_STUB_CATCH 448 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT 449 depends on PPC64 450 help 451 Very large kernels can cause linker branch stubs to be generated by 452 code in head_64.S, which moves the head text sections out of their 453 specified location. This option can work around the problem. 454 455 If unsure, say "N". 456 457config MPROFILE_KERNEL 458 depends on PPC64 && CPU_LITTLE_ENDIAN 459 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__) 460 461config HOTPLUG_CPU 462 bool "Support for enabling/disabling CPUs" 463 depends on SMP && (PPC_PSERIES || \ 464 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE) 465 ---help--- 466 Say Y here to be able to disable and re-enable individual 467 CPUs at runtime on SMP machines. 468 469 Say N if you are unsure. 470 471config ARCH_CPU_PROBE_RELEASE 472 def_bool y 473 depends on HOTPLUG_CPU 474 475config ARCH_ENABLE_MEMORY_HOTPLUG 476 def_bool y 477 478config ARCH_HAS_WALK_MEMORY 479 def_bool y 480 481config ARCH_ENABLE_MEMORY_HOTREMOVE 482 def_bool y 483 484config PPC64_SUPPORTS_MEMORY_FAILURE 485 bool "Add support for memory hwpoison" 486 depends on PPC_BOOK3S_64 487 default "y" if PPC_POWERNV 488 select ARCH_SUPPORTS_MEMORY_FAILURE 489 490config KEXEC 491 bool "kexec system call" 492 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E 493 select KEXEC_CORE 494 help 495 kexec is a system call that implements the ability to shutdown your 496 current kernel, and to start another kernel. It is like a reboot 497 but it is independent of the system firmware. And like a reboot 498 you can start any kernel with it, not just Linux. 499 500 The name comes from the similarity to the exec system call. 501 502 It is an ongoing process to be certain the hardware in a machine 503 is properly shutdown, so do not be surprised if this code does not 504 initially work for you. As of this writing the exact hardware 505 interface is strongly in flux, so no good recommendation can be 506 made. 507 508config KEXEC_FILE 509 bool "kexec file based system call" 510 select KEXEC_CORE 511 select HAVE_IMA_KEXEC 512 select BUILD_BIN2C 513 depends on PPC64 514 depends on CRYPTO=y 515 depends on CRYPTO_SHA256=y 516 help 517 This is a new version of the kexec system call. This call is 518 file based and takes in file descriptors as system call arguments 519 for kernel and initramfs as opposed to a list of segments as is the 520 case for the older kexec call. 521 522config ARCH_HAS_KEXEC_PURGATORY 523 def_bool KEXEC_FILE 524 525config RELOCATABLE 526 bool "Build a relocatable kernel" 527 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE)) 528 select NONSTATIC_KERNEL 529 select MODULE_REL_CRCS if MODVERSIONS 530 help 531 This builds a kernel image that is capable of running at the 532 location the kernel is loaded at. For ppc32, there is no any 533 alignment restrictions, and this feature is a superset of 534 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use 535 16k-aligned base address. The kernel is linked as a 536 position-independent executable (PIE) and contains dynamic relocations 537 which are processed early in the bootup process. 538 539 One use is for the kexec on panic case where the recovery kernel 540 must live at a different physical address than the primary 541 kernel. 542 543 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address 544 it has been loaded at and the compile time physical addresses 545 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START 546 setting can still be useful to bootwrappers that need to know the 547 load address of the kernel (eg. u-boot/mkimage). 548 549config RELOCATABLE_TEST 550 bool "Test relocatable kernel" 551 depends on (PPC64 && RELOCATABLE) 552 help 553 This runs the relocatable kernel at the address it was initially 554 loaded at, which tends to be non-zero and therefore test the 555 relocation code. 556 557config CRASH_DUMP 558 bool "Build a dump capture kernel" 559 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP) 560 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE 561 help 562 Build a kernel suitable for use as a dump capture kernel. 563 The same kernel binary can be used as production kernel and dump 564 capture kernel. 565 566config FA_DUMP 567 bool "Firmware-assisted dump" 568 depends on PPC64 && PPC_RTAS 569 select CRASH_CORE 570 select CRASH_DUMP 571 help 572 A robust mechanism to get reliable kernel crash dump with 573 assistance from firmware. This approach does not use kexec, 574 instead firmware assists in booting the capture kernel 575 while preserving memory contents. Firmware-assisted dump 576 is meant to be a kdump replacement offering robustness and 577 speed not possible without system firmware assistance. 578 579 If unsure, say "N" 580 581config IRQ_ALL_CPUS 582 bool "Distribute interrupts on all CPUs by default" 583 depends on SMP 584 help 585 This option gives the kernel permission to distribute IRQs across 586 multiple CPUs. Saying N here will route all IRQs to the first 587 CPU. Generally saying Y is safe, although some problems have been 588 reported with SMP Power Macintoshes with this option enabled. 589 590config NUMA 591 bool "NUMA support" 592 depends on PPC64 593 default y if SMP && PPC_PSERIES 594 595config NODES_SHIFT 596 int 597 default "8" if PPC64 598 default "4" 599 depends on NEED_MULTIPLE_NODES 600 601config USE_PERCPU_NUMA_NODE_ID 602 def_bool y 603 depends on NUMA 604 605config HAVE_MEMORYLESS_NODES 606 def_bool y 607 depends on NUMA 608 609config ARCH_SELECT_MEMORY_MODEL 610 def_bool y 611 depends on PPC64 612 613config ARCH_FLATMEM_ENABLE 614 def_bool y 615 depends on (PPC64 && !NUMA) || PPC32 616 617config ARCH_SPARSEMEM_ENABLE 618 def_bool y 619 depends on PPC64 620 select SPARSEMEM_VMEMMAP_ENABLE 621 622config ARCH_SPARSEMEM_DEFAULT 623 def_bool y 624 depends on PPC_BOOK3S_64 625 626config SYS_SUPPORTS_HUGETLBFS 627 bool 628 629config ILLEGAL_POINTER_VALUE 630 hex 631 # This is roughly half way between the top of user space and the bottom 632 # of kernel space, which seems about as good as we can get. 633 default 0x5deadbeef0000000 if PPC64 634 default 0 635 636config ARCH_MEMORY_PROBE 637 def_bool y 638 depends on MEMORY_HOTPLUG 639 640# Some NUMA nodes have memory ranges that span 641# other nodes. Even though a pfn is valid and 642# between a node's start and end pfns, it may not 643# reside on that node. See memmap_init_zone() 644# for details. 645config NODES_SPAN_OTHER_NODES 646 def_bool y 647 depends on NEED_MULTIPLE_NODES 648 649config STDBINUTILS 650 bool "Using standard binutils settings" 651 depends on 44x 652 default y 653 help 654 Turning this option off allows you to select 256KB PAGE_SIZE on 44x. 655 Note, that kernel will be able to run only those applications, 656 which had been compiled using binutils later than 2.17.50.0.3 with 657 '-zmax-page-size' set to 256K (the default is 64K). Or, if using 658 the older binutils, you can patch them with a trivial patch, which 659 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000. 660 661choice 662 prompt "Page size" 663 default PPC_4K_PAGES 664 help 665 Select the kernel logical page size. Increasing the page size 666 will reduce software overhead at each page boundary, allow 667 hardware prefetch mechanisms to be more effective, and allow 668 larger dma transfers increasing IO efficiency and reducing 669 overhead. However the utilization of memory will increase. 670 For example, each cached file will using a multiple of the 671 page size to hold its contents and the difference between the 672 end of file and the end of page is wasted. 673 674 Some dedicated systems, such as software raid serving with 675 accelerated calculations, have shown significant increases. 676 677 If you configure a 64 bit kernel for 64k pages but the 678 processor does not support them, then the kernel will simulate 679 them with 4k pages, loading them on demand, but with the 680 reduced software overhead and larger internal fragmentation. 681 For the 32 bit kernel, a large page option will not be offered 682 unless it is supported by the configured processor. 683 684 If unsure, choose 4K_PAGES. 685 686config PPC_4K_PAGES 687 bool "4k page size" 688 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 689 690config PPC_16K_PAGES 691 bool "16k page size" 692 depends on 44x || PPC_8xx 693 694config PPC_64K_PAGES 695 bool "64k page size" 696 depends on !PPC_FSL_BOOK3E && (44x || PPC_BOOK3S_64 || PPC_BOOK3E_64) 697 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 698 699config PPC_256K_PAGES 700 bool "256k page size" 701 depends on 44x && !STDBINUTILS 702 help 703 Make the page size 256k. 704 705 As the ELF standard only requires alignment to support page 706 sizes up to 64k, you will need to compile all of your user 707 space applications with a non-standard binutils settings 708 (see the STDBINUTILS description for details). 709 710 Say N unless you know what you are doing. 711 712endchoice 713 714config THREAD_SHIFT 715 int "Thread shift" if EXPERT 716 range 13 15 717 default "15" if PPC_256K_PAGES 718 default "14" if PPC64 719 default "13" 720 help 721 Used to define the stack size. The default is almost always what you 722 want. Only change this if you know what you are doing. 723 724config FORCE_MAX_ZONEORDER 725 int "Maximum zone order" 726 range 8 9 if PPC64 && PPC_64K_PAGES 727 default "9" if PPC64 && PPC_64K_PAGES 728 range 13 13 if PPC64 && !PPC_64K_PAGES 729 default "13" if PPC64 && !PPC_64K_PAGES 730 range 9 64 if PPC32 && PPC_16K_PAGES 731 default "9" if PPC32 && PPC_16K_PAGES 732 range 7 64 if PPC32 && PPC_64K_PAGES 733 default "7" if PPC32 && PPC_64K_PAGES 734 range 5 64 if PPC32 && PPC_256K_PAGES 735 default "5" if PPC32 && PPC_256K_PAGES 736 range 11 64 737 default "11" 738 help 739 The kernel memory allocator divides physically contiguous memory 740 blocks into "zones", where each zone is a power of two number of 741 pages. This option selects the largest power of two that the kernel 742 keeps in the memory allocator. If you need to allocate very large 743 blocks of physically contiguous memory, then you may need to 744 increase this value. 745 746 This config option is actually maximum order plus one. For example, 747 a value of 11 means that the largest free memory block is 2^10 pages. 748 749 The page size is not necessarily 4KB. For example, on 64-bit 750 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep 751 this in mind when choosing a value for this option. 752 753config PPC_SUBPAGE_PROT 754 bool "Support setting protections for 4k subpages" 755 depends on PPC_BOOK3S_64 && PPC_64K_PAGES 756 help 757 This option adds support for a system call to allow user programs 758 to set access permissions (read/write, readonly, or no access) 759 on the 4k subpages of each 64k page. 760 761config PPC_COPRO_BASE 762 bool 763 764config SCHED_SMT 765 bool "SMT (Hyperthreading) scheduler support" 766 depends on PPC64 && SMP 767 help 768 SMT scheduler support improves the CPU scheduler's decision making 769 when dealing with POWER5 cpus at a cost of slightly increased 770 overhead in some places. If unsure say N here. 771 772config PPC_DENORMALISATION 773 bool "PowerPC denormalisation exception handling" 774 depends on PPC_BOOK3S_64 775 default "y" if PPC_POWERNV 776 ---help--- 777 Add support for handling denormalisation of single precision 778 values. Useful for bare metal only. If unsure say Y here. 779 780config CMDLINE_BOOL 781 bool "Default bootloader kernel arguments" 782 783config CMDLINE 784 string "Initial kernel command string" 785 depends on CMDLINE_BOOL 786 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" 787 help 788 On some platforms, there is currently no way for the boot loader to 789 pass arguments to the kernel. For these platforms, you can supply 790 some command-line options at build time by entering them here. In 791 most cases you will need to specify the root device here. 792 793config CMDLINE_FORCE 794 bool "Always use the default kernel command string" 795 depends on CMDLINE_BOOL 796 help 797 Always use the default kernel command string, even if the boot 798 loader passes other arguments to the kernel. 799 This is useful if you cannot or don't want to change the 800 command-line options your boot loader passes to the kernel. 801 802config EXTRA_TARGETS 803 string "Additional default image types" 804 help 805 List additional targets to be built by the bootwrapper here (separated 806 by spaces). This is useful for targets that depend of device tree 807 files in the .dts directory. 808 809 Targets in this list will be build as part of the default build 810 target, or when the user does a 'make zImage' or a 811 'make zImage.initrd'. 812 813 If unsure, leave blank 814 815config ARCH_WANTS_FREEZER_CONTROL 816 def_bool y 817 depends on ADB_PMU 818 819source kernel/power/Kconfig 820 821config SECCOMP 822 bool "Enable seccomp to safely compute untrusted bytecode" 823 depends on PROC_FS 824 default y 825 help 826 This kernel feature is useful for number crunching applications 827 that may need to compute untrusted bytecode during their 828 execution. By using pipes or other transports made available to 829 the process as file descriptors supporting the read/write 830 syscalls, it's possible to isolate those applications in 831 their own address space using seccomp. Once seccomp is 832 enabled via /proc/<pid>/seccomp, it cannot be disabled 833 and the task is only allowed to execute a few safe syscalls 834 defined by each seccomp mode. 835 836 If unsure, say Y. Only embedded should say N here. 837 838config PPC_MEM_KEYS 839 prompt "PowerPC Memory Protection Keys" 840 def_bool y 841 depends on PPC_BOOK3S_64 842 select ARCH_USES_HIGH_VMA_FLAGS 843 select ARCH_HAS_PKEYS 844 help 845 Memory Protection Keys provides a mechanism for enforcing 846 page-based protections, but without requiring modification of the 847 page tables when an application changes protection domains. 848 849 For details, see Documentation/vm/protection-keys.rst 850 851 If unsure, say y. 852 853endmenu 854 855config ISA_DMA_API 856 bool 857 default PCI 858 859menu "Bus options" 860 861config ISA 862 bool "Support for ISA-bus hardware" 863 depends on PPC_CHRP 864 select PPC_I8259 865 help 866 Find out whether you have ISA slots on your motherboard. ISA is the 867 name of a bus system, i.e. the way the CPU talks to the other stuff 868 inside your box. If you have an Apple machine, say N here; if you 869 have an IBM RS/6000 or pSeries machine, say Y. If you have an 870 embedded board, consult your board documentation. 871 872config ZONE_DMA 873 bool 874 default y 875 876config GENERIC_ISA_DMA 877 bool 878 depends on ISA_DMA_API 879 default y 880 881config PPC_INDIRECT_PCI 882 bool 883 depends on PCI 884 default y if 40x || 44x 885 886config EISA 887 bool 888 889config SBUS 890 bool 891 892config FSL_SOC 893 bool 894 895config FSL_PCI 896 bool 897 select PPC_INDIRECT_PCI 898 select PCI_QUIRKS 899 900config FSL_PMC 901 bool 902 default y 903 depends on SUSPEND && (PPC_85xx || PPC_86xx) 904 help 905 Freescale MPC85xx/MPC86xx power management controller support 906 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c 907 908config PPC4xx_CPM 909 bool 910 default y 911 depends on SUSPEND && (44x || 40x) 912 help 913 PPC4xx Clock Power Management (CPM) support (suspend/resume). 914 It also enables support for two different idle states (idle-wait 915 and idle-doze). 916 917config 4xx_SOC 918 bool 919 920config FSL_LBC 921 bool "Freescale Local Bus support" 922 help 923 Enables reporting of errors from the Freescale local bus 924 controller. Also contains some common code used by 925 drivers for specific local bus peripherals. 926 927config FSL_GTM 928 bool 929 depends on PPC_83xx || QUICC_ENGINE || CPM2 930 help 931 Freescale General-purpose Timers support 932 933# Platforms that what PCI turned unconditionally just do select PCI 934# in their config node. Platforms that want to choose at config 935# time should select PPC_PCI_CHOICE 936config PPC_PCI_CHOICE 937 bool 938 939config PCI 940 bool "PCI support" if PPC_PCI_CHOICE 941 default y if !40x && !CPM2 && !PPC_8xx && !PPC_83xx \ 942 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON 943 select GENERIC_PCI_IOMAP 944 help 945 Find out whether your system includes a PCI bus. PCI is the name of 946 a bus system, i.e. the way the CPU talks to the other stuff inside 947 your box. If you say Y here, the kernel will include drivers and 948 infrastructure code to support PCI bus devices. 949 950config PCI_DOMAINS 951 def_bool PCI 952 953config PCI_SYSCALL 954 def_bool PCI 955 956config PCI_8260 957 bool 958 depends on PCI && 8260 959 select PPC_INDIRECT_PCI 960 default y 961 962source "drivers/pci/Kconfig" 963 964source "drivers/pcmcia/Kconfig" 965 966config HAS_RAPIDIO 967 bool 968 969config RAPIDIO 970 tristate "RapidIO support" 971 depends on HAS_RAPIDIO || PCI 972 help 973 If you say Y here, the kernel will include drivers and 974 infrastructure code to support RapidIO interconnect devices. 975 976config FSL_RIO 977 bool "Freescale Embedded SRIO Controller support" 978 depends on RAPIDIO = y && HAS_RAPIDIO 979 default "n" 980 ---help--- 981 Include support for RapidIO controller on Freescale embedded 982 processors (MPC8548, MPC8641, etc). 983 984source "drivers/rapidio/Kconfig" 985 986endmenu 987 988config NONSTATIC_KERNEL 989 bool 990 991menu "Advanced setup" 992 depends on PPC32 993 994config ADVANCED_OPTIONS 995 bool "Prompt for advanced kernel configuration options" 996 help 997 This option will enable prompting for a variety of advanced kernel 998 configuration options. These options can cause the kernel to not 999 work if they are set incorrectly, but can be used to optimize certain 1000 aspects of kernel memory management. 1001 1002 Unless you know what you are doing, say N here. 1003 1004comment "Default settings for advanced configuration options are used" 1005 depends on !ADVANCED_OPTIONS 1006 1007config LOWMEM_SIZE_BOOL 1008 bool "Set maximum low memory" 1009 depends on ADVANCED_OPTIONS 1010 help 1011 This option allows you to set the maximum amount of memory which 1012 will be used as "low memory", that is, memory which the kernel can 1013 access directly, without having to set up a kernel virtual mapping. 1014 This can be useful in optimizing the layout of kernel virtual 1015 memory. 1016 1017 Say N here unless you know what you are doing. 1018 1019config LOWMEM_SIZE 1020 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL 1021 default "0x30000000" 1022 1023config LOWMEM_CAM_NUM_BOOL 1024 bool "Set number of CAMs to use to map low memory" 1025 depends on ADVANCED_OPTIONS && FSL_BOOKE 1026 help 1027 This option allows you to set the maximum number of CAM slots that 1028 will be used to map low memory. There are a limited number of slots 1029 available and even more limited number that will fit in the L1 MMU. 1030 However, using more entries will allow mapping more low memory. This 1031 can be useful in optimizing the layout of kernel virtual memory. 1032 1033 Say N here unless you know what you are doing. 1034 1035config LOWMEM_CAM_NUM 1036 depends on FSL_BOOKE 1037 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL 1038 default 3 1039 1040config DYNAMIC_MEMSTART 1041 bool "Enable page aligned dynamic load address for kernel" 1042 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x) 1043 select NONSTATIC_KERNEL 1044 help 1045 This option enables the kernel to be loaded at any page aligned 1046 physical address. The kernel creates a mapping from KERNELBASE to 1047 the address where the kernel is loaded. The page size here implies 1048 the TLB page size of the mapping for kernel on the particular platform. 1049 Please refer to the init code for finding the TLB page size. 1050 1051 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE 1052 kernel image, where the only restriction is the page aligned kernel 1053 load address. When this option is enabled, the compile time physical 1054 address CONFIG_PHYSICAL_START is ignored. 1055 1056 This option is overridden by CONFIG_RELOCATABLE 1057 1058config PAGE_OFFSET_BOOL 1059 bool "Set custom page offset address" 1060 depends on ADVANCED_OPTIONS 1061 help 1062 This option allows you to set the kernel virtual address at which 1063 the kernel will map low memory. This can be useful in optimizing 1064 the virtual memory layout of the system. 1065 1066 Say N here unless you know what you are doing. 1067 1068config PAGE_OFFSET 1069 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL 1070 default "0xc0000000" 1071 1072config KERNEL_START_BOOL 1073 bool "Set custom kernel base address" 1074 depends on ADVANCED_OPTIONS 1075 help 1076 This option allows you to set the kernel virtual address at which 1077 the kernel will be loaded. Normally this should match PAGE_OFFSET 1078 however there are times (like kdump) that one might not want them 1079 to be the same. 1080 1081 Say N here unless you know what you are doing. 1082 1083config KERNEL_START 1084 hex "Virtual address of kernel base" if KERNEL_START_BOOL 1085 default PAGE_OFFSET if PAGE_OFFSET_BOOL 1086 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL 1087 default "0xc0000000" 1088 1089config PHYSICAL_START_BOOL 1090 bool "Set physical address where the kernel is loaded" 1091 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE 1092 help 1093 This gives the physical address where the kernel is loaded. 1094 1095 Say N here unless you know what you are doing. 1096 1097config PHYSICAL_START 1098 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL 1099 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL 1100 default "0x00000000" 1101 1102config PHYSICAL_ALIGN 1103 hex 1104 default "0x04000000" if FSL_BOOKE 1105 help 1106 This value puts the alignment restrictions on physical address 1107 where kernel is loaded and run from. Kernel is compiled for an 1108 address which meets above alignment restriction. 1109 1110config TASK_SIZE_BOOL 1111 bool "Set custom user task size" 1112 depends on ADVANCED_OPTIONS 1113 help 1114 This option allows you to set the amount of virtual address space 1115 allocated to user tasks. This can be useful in optimizing the 1116 virtual memory layout of the system. 1117 1118 Say N here unless you know what you are doing. 1119 1120config TASK_SIZE 1121 hex "Size of user task space" if TASK_SIZE_BOOL 1122 default "0x80000000" if PPC_8xx 1123 default "0xc0000000" 1124 1125config CONSISTENT_SIZE_BOOL 1126 bool "Set custom consistent memory pool size" 1127 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE 1128 help 1129 This option allows you to set the size of the 1130 consistent memory pool. This pool of virtual memory 1131 is used to make consistent memory allocations. 1132 1133config CONSISTENT_SIZE 1134 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL 1135 default "0x00200000" if NOT_COHERENT_CACHE 1136 1137config PIN_TLB 1138 bool "Pinned Kernel TLBs (860 ONLY)" 1139 depends on ADVANCED_OPTIONS && PPC_8xx && \ 1140 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX 1141 1142config PIN_TLB_DATA 1143 bool "Pinned TLB for DATA" 1144 depends on PIN_TLB 1145 default y 1146 1147config PIN_TLB_IMMR 1148 bool "Pinned TLB for IMMR" 1149 depends on PIN_TLB 1150 default y 1151 1152config PIN_TLB_TEXT 1153 bool "Pinned TLB for TEXT" 1154 depends on PIN_TLB 1155 default y 1156endmenu 1157 1158if PPC64 1159# This value must have zeroes in the bottom 60 bits otherwise lots will break 1160config PAGE_OFFSET 1161 hex 1162 default "0xc000000000000000" 1163config KERNEL_START 1164 hex 1165 default "0xc000000000000000" 1166config PHYSICAL_START 1167 hex 1168 default "0x00000000" 1169endif 1170 1171config ARCH_RANDOM 1172 def_bool n 1173 1174config PPC_LIB_RHEAP 1175 bool 1176 1177source "arch/powerpc/kvm/Kconfig" 1178 1179source "kernel/livepatch/Kconfig" 1180