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 PPC 123 bool 124 default y 125 # 126 # Please keep this list sorted alphabetically. 127 # 128 select ARCH_HAS_DEBUG_VIRTUAL 129 select ARCH_HAS_DEVMEM_IS_ALLOWED 130 select ARCH_HAS_ELF_RANDOMIZE 131 select ARCH_HAS_FORTIFY_SOURCE 132 select ARCH_HAS_GCOV_PROFILE_ALL 133 select ARCH_HAS_PHYS_TO_DMA 134 select ARCH_HAS_PMEM_API if PPC64 135 select ARCH_HAS_PTE_SPECIAL 136 select ARCH_HAS_MEMBARRIER_CALLBACKS 137 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC64 138 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION) 139 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 140 select ARCH_HAS_UACCESS_FLUSHCACHE if PPC64 141 select ARCH_HAS_UBSAN_SANITIZE_ALL 142 select ARCH_HAS_ZONE_DEVICE if PPC_BOOK3S_64 143 select ARCH_HAVE_NMI_SAFE_CMPXCHG 144 select ARCH_MIGHT_HAVE_PC_PARPORT 145 select ARCH_MIGHT_HAVE_PC_SERIO 146 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX 147 select ARCH_SUPPORTS_ATOMIC_RMW 148 select ARCH_USE_BUILTIN_BSWAP 149 select ARCH_USE_CMPXCHG_LOCKREF if PPC64 150 select ARCH_WANT_IPC_PARSE_VERSION 151 select ARCH_WEAK_RELEASE_ACQUIRE 152 select BINFMT_ELF 153 select BUILDTIME_EXTABLE_SORT 154 select CLONE_BACKWARDS 155 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN 156 select DYNAMIC_FTRACE if FUNCTION_TRACER 157 select EDAC_ATOMIC_SCRUB 158 select EDAC_SUPPORT 159 select GENERIC_ATOMIC64 if PPC32 160 select GENERIC_CLOCKEVENTS 161 select GENERIC_CLOCKEVENTS_BROADCAST if SMP 162 select GENERIC_CMOS_UPDATE 163 select GENERIC_CPU_AUTOPROBE 164 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC 165 select GENERIC_IRQ_SHOW 166 select GENERIC_IRQ_SHOW_LEVEL 167 select GENERIC_PCI_IOMAP if PCI 168 select GENERIC_SMP_IDLE_THREAD 169 select GENERIC_STRNCPY_FROM_USER 170 select GENERIC_STRNLEN_USER 171 select GENERIC_TIME_VSYSCALL 172 select HAVE_ARCH_AUDITSYSCALL 173 select HAVE_ARCH_JUMP_LABEL 174 select HAVE_ARCH_KGDB 175 select HAVE_ARCH_MMAP_RND_BITS 176 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT 177 select HAVE_ARCH_SECCOMP_FILTER 178 select HAVE_ARCH_TRACEHOOK 179 select HAVE_CBPF_JIT if !PPC64 180 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13) 181 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2) 182 select HAVE_CONTEXT_TRACKING if PPC64 183 select HAVE_DEBUG_KMEMLEAK 184 select HAVE_DEBUG_STACKOVERFLOW 185 select HAVE_DYNAMIC_FTRACE 186 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL 187 select HAVE_EBPF_JIT if PPC64 188 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU) 189 select HAVE_FTRACE_MCOUNT_RECORD 190 select HAVE_FUNCTION_ERROR_INJECTION 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 || 44x 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_NODE_MAP 207 select HAVE_MOD_ARCH_SPECIFIC 208 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S) 209 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S) 210 select HAVE_OPROFILE 211 select HAVE_OPTPROBES if PPC64 212 select HAVE_PERF_EVENTS 213 select HAVE_PERF_EVENTS_NMI if PPC64 214 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH 215 select HAVE_PERF_REGS 216 select HAVE_PERF_USER_STACK_DUMP 217 select HAVE_RCU_TABLE_FREE if SMP 218 select HAVE_REGS_AND_STACK_ACCESS_API 219 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN 220 select HAVE_SYSCALL_TRACEPOINTS 221 select HAVE_VIRT_CPU_ACCOUNTING 222 select HAVE_IRQ_TIME_ACCOUNTING 223 select HAVE_RSEQ 224 select IOMMU_HELPER if PPC64 225 select IRQ_DOMAIN 226 select IRQ_FORCED_THREADING 227 select MODULES_USE_ELF_RELA 228 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE 229 select NEED_SG_DMA_LENGTH 230 select OF 231 select OF_EARLY_FLATTREE 232 select OF_RESERVED_MEM 233 select OLD_SIGACTION if PPC32 234 select OLD_SIGSUSPEND 235 select PCI_DOMAINS if PCI 236 select PCI_SYSCALL if PCI 237 select RTC_LIB 238 select SPARSE_IRQ 239 select SYSCTL_EXCEPTION_TRACE 240 select VIRT_TO_BUS if !PPC64 241 # 242 # Please keep this list sorted alphabetically. 243 # 244 245config PPC_BARRIER_NOSPEC 246 bool 247 default y 248 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E 249 250config EARLY_PRINTK 251 bool 252 default y 253 254config PANIC_TIMEOUT 255 int 256 default 180 257 258config COMPAT 259 bool 260 default y if PPC64 261 select COMPAT_BINFMT_ELF 262 select ARCH_WANT_OLD_COMPAT_IPC 263 select COMPAT_OLD_SIGACTION 264 265config SYSVIPC_COMPAT 266 bool 267 depends on COMPAT && SYSVIPC 268 default y 269 270# All PPC32s use generic nvram driver through ppc_md 271config GENERIC_NVRAM 272 bool 273 default y if PPC32 274 275config SCHED_OMIT_FRAME_POINTER 276 bool 277 default y 278 279config ARCH_MAY_HAVE_PC_FDC 280 bool 281 default PCI 282 283config PPC_UDBG_16550 284 bool 285 286config GENERIC_TBSYNC 287 bool 288 default y if PPC32 && SMP 289 290config AUDIT_ARCH 291 bool 292 default y 293 294config GENERIC_BUG 295 bool 296 default y 297 depends on BUG 298 299config SYS_SUPPORTS_APM_EMULATION 300 default y if PMAC_APM_EMU 301 bool 302 303config EPAPR_BOOT 304 bool 305 help 306 Used to allow a board to specify it wants an ePAPR compliant wrapper. 307 308config DEFAULT_UIMAGE 309 bool 310 help 311 Used to allow a board to specify it wants a uImage built by default 312 313config ARCH_HIBERNATION_POSSIBLE 314 bool 315 default y 316 317config ARCH_SUSPEND_POSSIBLE 318 def_bool y 319 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \ 320 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \ 321 || 44x || 40x 322 323config PPC_DCR_NATIVE 324 bool 325 326config PPC_DCR_MMIO 327 bool 328 329config PPC_DCR 330 bool 331 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO 332 default y 333 334config PPC_OF_PLATFORM_PCI 335 bool 336 depends on PCI 337 depends on PPC64 # not supported on 32 bits yet 338 339config ARCH_SUPPORTS_DEBUG_PAGEALLOC 340 depends on PPC32 || PPC_BOOK3S_64 341 def_bool y 342 343config ARCH_SUPPORTS_UPROBES 344 def_bool y 345 346config PPC_ADV_DEBUG_REGS 347 bool 348 depends on 40x || BOOKE 349 default y 350 351config PPC_ADV_DEBUG_IACS 352 int 353 depends on PPC_ADV_DEBUG_REGS 354 default 4 if 44x 355 default 2 356 357config PPC_ADV_DEBUG_DACS 358 int 359 depends on PPC_ADV_DEBUG_REGS 360 default 2 361 362config PPC_ADV_DEBUG_DVCS 363 int 364 depends on PPC_ADV_DEBUG_REGS 365 default 2 if 44x 366 default 0 367 368config PPC_ADV_DEBUG_DAC_RANGE 369 bool 370 depends on PPC_ADV_DEBUG_REGS && 44x 371 default y 372 373config ZONE_DMA 374 bool 375 default y if PPC_BOOK3E_64 376 377config PGTABLE_LEVELS 378 int 379 default 2 if !PPC64 380 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64 381 default 4 382 383source "arch/powerpc/sysdev/Kconfig" 384source "arch/powerpc/platforms/Kconfig" 385 386menu "Kernel options" 387 388config HIGHMEM 389 bool "High memory support" 390 depends on PPC32 391 392source "kernel/Kconfig.hz" 393 394config HUGETLB_PAGE_SIZE_VARIABLE 395 bool 396 depends on HUGETLB_PAGE 397 default y 398 399config MATH_EMULATION 400 bool "Math emulation" 401 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE 402 ---help--- 403 Some PowerPC chips designed for embedded applications do not have 404 a floating-point unit and therefore do not implement the 405 floating-point instructions in the PowerPC instruction set. If you 406 say Y here, the kernel will include code to emulate a floating-point 407 unit, which will allow programs that use floating-point 408 instructions to run. 409 410 This is also useful to emulate missing (optional) instructions 411 such as fsqrt on cores that do have an FPU but do not implement 412 them (such as Freescale BookE). 413 414choice 415 prompt "Math emulation options" 416 default MATH_EMULATION_FULL 417 depends on MATH_EMULATION 418 419config MATH_EMULATION_FULL 420 bool "Emulate all the floating point instructions" 421 ---help--- 422 Select this option will enable the kernel to support to emulate 423 all the floating point instructions. If your SoC doesn't have 424 a FPU, you should select this. 425 426config MATH_EMULATION_HW_UNIMPLEMENTED 427 bool "Just emulate the FPU unimplemented instructions" 428 ---help--- 429 Select this if you know there does have a hardware FPU on your 430 SoC, but some floating point instructions are not implemented by that. 431 432endchoice 433 434config PPC_TRANSACTIONAL_MEM 435 bool "Transactional Memory support for POWERPC" 436 depends on PPC_BOOK3S_64 437 depends on SMP 438 select ALTIVEC 439 select VSX 440 ---help--- 441 Support user-mode Transactional Memory on POWERPC. 442 443config LD_HEAD_STUB_CATCH 444 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT 445 depends on PPC64 446 help 447 Very large kernels can cause linker branch stubs to be generated by 448 code in head_64.S, which moves the head text sections out of their 449 specified location. This option can work around the problem. 450 451 If unsure, say "N". 452 453config MPROFILE_KERNEL 454 depends on PPC64 && CPU_LITTLE_ENDIAN 455 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__) 456 457config HOTPLUG_CPU 458 bool "Support for enabling/disabling CPUs" 459 depends on SMP && (PPC_PSERIES || \ 460 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE) 461 ---help--- 462 Say Y here to be able to disable and re-enable individual 463 CPUs at runtime on SMP machines. 464 465 Say N if you are unsure. 466 467config ARCH_CPU_PROBE_RELEASE 468 def_bool y 469 depends on HOTPLUG_CPU 470 471config ARCH_ENABLE_MEMORY_HOTPLUG 472 def_bool y 473 474config ARCH_ENABLE_MEMORY_HOTREMOVE 475 def_bool y 476 477config PPC64_SUPPORTS_MEMORY_FAILURE 478 bool "Add support for memory hwpoison" 479 depends on PPC_BOOK3S_64 480 default "y" if PPC_POWERNV 481 select ARCH_SUPPORTS_MEMORY_FAILURE 482 483config KEXEC 484 bool "kexec system call" 485 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E 486 select KEXEC_CORE 487 help 488 kexec is a system call that implements the ability to shutdown your 489 current kernel, and to start another kernel. It is like a reboot 490 but it is independent of the system firmware. And like a reboot 491 you can start any kernel with it, not just Linux. 492 493 The name comes from the similarity to the exec system call. 494 495 It is an ongoing process to be certain the hardware in a machine 496 is properly shutdown, so do not be surprised if this code does not 497 initially work for you. As of this writing the exact hardware 498 interface is strongly in flux, so no good recommendation can be 499 made. 500 501config KEXEC_FILE 502 bool "kexec file based system call" 503 select KEXEC_CORE 504 select HAVE_IMA_KEXEC 505 select BUILD_BIN2C 506 depends on PPC64 507 depends on CRYPTO=y 508 depends on CRYPTO_SHA256=y 509 help 510 This is a new version of the kexec system call. This call is 511 file based and takes in file descriptors as system call arguments 512 for kernel and initramfs as opposed to a list of segments as is the 513 case for the older kexec call. 514 515config ARCH_HAS_KEXEC_PURGATORY 516 def_bool KEXEC_FILE 517 518config RELOCATABLE 519 bool "Build a relocatable kernel" 520 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE)) 521 select NONSTATIC_KERNEL 522 select MODULE_REL_CRCS if MODVERSIONS 523 help 524 This builds a kernel image that is capable of running at the 525 location the kernel is loaded at. For ppc32, there is no any 526 alignment restrictions, and this feature is a superset of 527 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use 528 16k-aligned base address. The kernel is linked as a 529 position-independent executable (PIE) and contains dynamic relocations 530 which are processed early in the bootup process. 531 532 One use is for the kexec on panic case where the recovery kernel 533 must live at a different physical address than the primary 534 kernel. 535 536 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address 537 it has been loaded at and the compile time physical addresses 538 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START 539 setting can still be useful to bootwrappers that need to know the 540 load address of the kernel (eg. u-boot/mkimage). 541 542config RELOCATABLE_TEST 543 bool "Test relocatable kernel" 544 depends on (PPC64 && RELOCATABLE) 545 help 546 This runs the relocatable kernel at the address it was initially 547 loaded at, which tends to be non-zero and therefore test the 548 relocation code. 549 550config CRASH_DUMP 551 bool "Build a dump capture kernel" 552 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP) 553 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE 554 help 555 Build a kernel suitable for use as a dump capture kernel. 556 The same kernel binary can be used as production kernel and dump 557 capture kernel. 558 559config FA_DUMP 560 bool "Firmware-assisted dump" 561 depends on PPC64 && PPC_RTAS 562 select CRASH_CORE 563 select CRASH_DUMP 564 help 565 A robust mechanism to get reliable kernel crash dump with 566 assistance from firmware. This approach does not use kexec, 567 instead firmware assists in booting the capture kernel 568 while preserving memory contents. Firmware-assisted dump 569 is meant to be a kdump replacement offering robustness and 570 speed not possible without system firmware assistance. 571 572 If unsure, say "N" 573 574config IRQ_ALL_CPUS 575 bool "Distribute interrupts on all CPUs by default" 576 depends on SMP 577 help 578 This option gives the kernel permission to distribute IRQs across 579 multiple CPUs. Saying N here will route all IRQs to the first 580 CPU. Generally saying Y is safe, although some problems have been 581 reported with SMP Power Macintoshes with this option enabled. 582 583config NUMA 584 bool "NUMA support" 585 depends on PPC64 586 default y if SMP && PPC_PSERIES 587 588config NODES_SHIFT 589 int 590 default "8" if PPC64 591 default "4" 592 depends on NEED_MULTIPLE_NODES 593 594config USE_PERCPU_NUMA_NODE_ID 595 def_bool y 596 depends on NUMA 597 598config HAVE_MEMORYLESS_NODES 599 def_bool y 600 depends on NUMA 601 602config ARCH_SELECT_MEMORY_MODEL 603 def_bool y 604 depends on PPC64 605 606config ARCH_FLATMEM_ENABLE 607 def_bool y 608 depends on (PPC64 && !NUMA) || PPC32 609 610config ARCH_SPARSEMEM_ENABLE 611 def_bool y 612 depends on PPC64 613 select SPARSEMEM_VMEMMAP_ENABLE 614 615config ARCH_SPARSEMEM_DEFAULT 616 def_bool y 617 depends on PPC_BOOK3S_64 618 619config SYS_SUPPORTS_HUGETLBFS 620 bool 621 622config ILLEGAL_POINTER_VALUE 623 hex 624 # This is roughly half way between the top of user space and the bottom 625 # of kernel space, which seems about as good as we can get. 626 default 0x5deadbeef0000000 if PPC64 627 default 0 628 629config ARCH_MEMORY_PROBE 630 def_bool y 631 depends on MEMORY_HOTPLUG 632 633# Some NUMA nodes have memory ranges that span 634# other nodes. Even though a pfn is valid and 635# between a node's start and end pfns, it may not 636# reside on that node. See memmap_init_zone() 637# for details. 638config NODES_SPAN_OTHER_NODES 639 def_bool y 640 depends on NEED_MULTIPLE_NODES 641 642config STDBINUTILS 643 bool "Using standard binutils settings" 644 depends on 44x 645 default y 646 help 647 Turning this option off allows you to select 256KB PAGE_SIZE on 44x. 648 Note, that kernel will be able to run only those applications, 649 which had been compiled using binutils later than 2.17.50.0.3 with 650 '-zmax-page-size' set to 256K (the default is 64K). Or, if using 651 the older binutils, you can patch them with a trivial patch, which 652 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000. 653 654choice 655 prompt "Page size" 656 default PPC_4K_PAGES 657 help 658 Select the kernel logical page size. Increasing the page size 659 will reduce software overhead at each page boundary, allow 660 hardware prefetch mechanisms to be more effective, and allow 661 larger dma transfers increasing IO efficiency and reducing 662 overhead. However the utilization of memory will increase. 663 For example, each cached file will using a multiple of the 664 page size to hold its contents and the difference between the 665 end of file and the end of page is wasted. 666 667 Some dedicated systems, such as software raid serving with 668 accelerated calculations, have shown significant increases. 669 670 If you configure a 64 bit kernel for 64k pages but the 671 processor does not support them, then the kernel will simulate 672 them with 4k pages, loading them on demand, but with the 673 reduced software overhead and larger internal fragmentation. 674 For the 32 bit kernel, a large page option will not be offered 675 unless it is supported by the configured processor. 676 677 If unsure, choose 4K_PAGES. 678 679config PPC_4K_PAGES 680 bool "4k page size" 681 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 682 683config PPC_16K_PAGES 684 bool "16k page size" 685 depends on 44x || PPC_8xx 686 687config PPC_64K_PAGES 688 bool "64k page size" 689 depends on 44x || PPC_BOOK3S_64 690 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 691 692config PPC_256K_PAGES 693 bool "256k page size" 694 depends on 44x && !STDBINUTILS 695 help 696 Make the page size 256k. 697 698 As the ELF standard only requires alignment to support page 699 sizes up to 64k, you will need to compile all of your user 700 space applications with a non-standard binutils settings 701 (see the STDBINUTILS description for details). 702 703 Say N unless you know what you are doing. 704 705endchoice 706 707config THREAD_SHIFT 708 int "Thread shift" if EXPERT 709 range 13 15 710 default "15" if PPC_256K_PAGES 711 default "14" if PPC64 712 default "13" 713 help 714 Used to define the stack size. The default is almost always what you 715 want. Only change this if you know what you are doing. 716 717config FORCE_MAX_ZONEORDER 718 int "Maximum zone order" 719 range 8 9 if PPC64 && PPC_64K_PAGES 720 default "9" if PPC64 && PPC_64K_PAGES 721 range 13 13 if PPC64 && !PPC_64K_PAGES 722 default "13" if PPC64 && !PPC_64K_PAGES 723 range 9 64 if PPC32 && PPC_16K_PAGES 724 default "9" if PPC32 && PPC_16K_PAGES 725 range 7 64 if PPC32 && PPC_64K_PAGES 726 default "7" if PPC32 && PPC_64K_PAGES 727 range 5 64 if PPC32 && PPC_256K_PAGES 728 default "5" if PPC32 && PPC_256K_PAGES 729 range 11 64 730 default "11" 731 help 732 The kernel memory allocator divides physically contiguous memory 733 blocks into "zones", where each zone is a power of two number of 734 pages. This option selects the largest power of two that the kernel 735 keeps in the memory allocator. If you need to allocate very large 736 blocks of physically contiguous memory, then you may need to 737 increase this value. 738 739 This config option is actually maximum order plus one. For example, 740 a value of 11 means that the largest free memory block is 2^10 pages. 741 742 The page size is not necessarily 4KB. For example, on 64-bit 743 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep 744 this in mind when choosing a value for this option. 745 746config PPC_SUBPAGE_PROT 747 bool "Support setting protections for 4k subpages" 748 depends on PPC_BOOK3S_64 && PPC_64K_PAGES 749 help 750 This option adds support for a system call to allow user programs 751 to set access permissions (read/write, readonly, or no access) 752 on the 4k subpages of each 64k page. 753 754config PPC_COPRO_BASE 755 bool 756 757config SCHED_SMT 758 bool "SMT (Hyperthreading) scheduler support" 759 depends on PPC64 && SMP 760 help 761 SMT scheduler support improves the CPU scheduler's decision making 762 when dealing with POWER5 cpus at a cost of slightly increased 763 overhead in some places. If unsure say N here. 764 765config PPC_DENORMALISATION 766 bool "PowerPC denormalisation exception handling" 767 depends on PPC_BOOK3S_64 768 default "y" if PPC_POWERNV 769 ---help--- 770 Add support for handling denormalisation of single precision 771 values. Useful for bare metal only. If unsure say Y here. 772 773config CMDLINE_BOOL 774 bool "Default bootloader kernel arguments" 775 776config CMDLINE 777 string "Initial kernel command string" 778 depends on CMDLINE_BOOL 779 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" 780 help 781 On some platforms, there is currently no way for the boot loader to 782 pass arguments to the kernel. For these platforms, you can supply 783 some command-line options at build time by entering them here. In 784 most cases you will need to specify the root device here. 785 786config CMDLINE_FORCE 787 bool "Always use the default kernel command string" 788 depends on CMDLINE_BOOL 789 help 790 Always use the default kernel command string, even if the boot 791 loader passes other arguments to the kernel. 792 This is useful if you cannot or don't want to change the 793 command-line options your boot loader passes to the kernel. 794 795config EXTRA_TARGETS 796 string "Additional default image types" 797 help 798 List additional targets to be built by the bootwrapper here (separated 799 by spaces). This is useful for targets that depend of device tree 800 files in the .dts directory. 801 802 Targets in this list will be build as part of the default build 803 target, or when the user does a 'make zImage' or a 804 'make zImage.initrd'. 805 806 If unsure, leave blank 807 808config ARCH_WANTS_FREEZER_CONTROL 809 def_bool y 810 depends on ADB_PMU 811 812source "kernel/power/Kconfig" 813 814config SECCOMP 815 bool "Enable seccomp to safely compute untrusted bytecode" 816 depends on PROC_FS 817 default y 818 help 819 This kernel feature is useful for number crunching applications 820 that may need to compute untrusted bytecode during their 821 execution. By using pipes or other transports made available to 822 the process as file descriptors supporting the read/write 823 syscalls, it's possible to isolate those applications in 824 their own address space using seccomp. Once seccomp is 825 enabled via /proc/<pid>/seccomp, it cannot be disabled 826 and the task is only allowed to execute a few safe syscalls 827 defined by each seccomp mode. 828 829 If unsure, say Y. Only embedded should say N here. 830 831config PPC_MEM_KEYS 832 prompt "PowerPC Memory Protection Keys" 833 def_bool y 834 depends on PPC_BOOK3S_64 835 select ARCH_USES_HIGH_VMA_FLAGS 836 select ARCH_HAS_PKEYS 837 help 838 Memory Protection Keys provides a mechanism for enforcing 839 page-based protections, but without requiring modification of the 840 page tables when an application changes protection domains. 841 842 For details, see Documentation/vm/protection-keys.rst 843 844 If unsure, say y. 845 846endmenu 847 848config ISA_DMA_API 849 bool 850 default PCI 851 852menu "Bus options" 853 854config ISA 855 bool "Support for ISA-bus hardware" 856 depends on PPC_CHRP 857 select PPC_I8259 858 help 859 Find out whether you have ISA slots on your motherboard. ISA is the 860 name of a bus system, i.e. the way the CPU talks to the other stuff 861 inside your box. If you have an Apple machine, say N here; if you 862 have an IBM RS/6000 or pSeries machine, say Y. If you have an 863 embedded board, consult your board documentation. 864 865config GENERIC_ISA_DMA 866 bool 867 depends on ISA_DMA_API 868 default y 869 870config PPC_INDIRECT_PCI 871 bool 872 depends on PCI 873 default y if 40x || 44x 874 875config SBUS 876 bool 877 878config FSL_SOC 879 bool 880 881config FSL_PCI 882 bool 883 select ARCH_HAS_DMA_SET_MASK 884 select PPC_INDIRECT_PCI 885 select PCI_QUIRKS 886 887config FSL_PMC 888 bool 889 default y 890 depends on SUSPEND && (PPC_85xx || PPC_86xx) 891 help 892 Freescale MPC85xx/MPC86xx power management controller support 893 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c 894 895config PPC4xx_CPM 896 bool 897 default y 898 depends on SUSPEND && (44x || 40x) 899 help 900 PPC4xx Clock Power Management (CPM) support (suspend/resume). 901 It also enables support for two different idle states (idle-wait 902 and idle-doze). 903 904config 4xx_SOC 905 bool 906 907config FSL_LBC 908 bool "Freescale Local Bus support" 909 help 910 Enables reporting of errors from the Freescale local bus 911 controller. Also contains some common code used by 912 drivers for specific local bus peripherals. 913 914config FSL_GTM 915 bool 916 depends on PPC_83xx || QUICC_ENGINE || CPM2 917 help 918 Freescale General-purpose Timers support 919 920config PCI_8260 921 bool 922 depends on PCI && 8260 923 select PPC_INDIRECT_PCI 924 default y 925 926config FSL_RIO 927 bool "Freescale Embedded SRIO Controller support" 928 depends on RAPIDIO = y && HAVE_RAPIDIO 929 default "n" 930 ---help--- 931 Include support for RapidIO controller on Freescale embedded 932 processors (MPC8548, MPC8641, etc). 933 934endmenu 935 936config NONSTATIC_KERNEL 937 bool 938 939menu "Advanced setup" 940 depends on PPC32 941 942config ADVANCED_OPTIONS 943 bool "Prompt for advanced kernel configuration options" 944 help 945 This option will enable prompting for a variety of advanced kernel 946 configuration options. These options can cause the kernel to not 947 work if they are set incorrectly, but can be used to optimize certain 948 aspects of kernel memory management. 949 950 Unless you know what you are doing, say N here. 951 952comment "Default settings for advanced configuration options are used" 953 depends on !ADVANCED_OPTIONS 954 955config LOWMEM_SIZE_BOOL 956 bool "Set maximum low memory" 957 depends on ADVANCED_OPTIONS 958 help 959 This option allows you to set the maximum amount of memory which 960 will be used as "low memory", that is, memory which the kernel can 961 access directly, without having to set up a kernel virtual mapping. 962 This can be useful in optimizing the layout of kernel virtual 963 memory. 964 965 Say N here unless you know what you are doing. 966 967config LOWMEM_SIZE 968 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL 969 default "0x30000000" 970 971config LOWMEM_CAM_NUM_BOOL 972 bool "Set number of CAMs to use to map low memory" 973 depends on ADVANCED_OPTIONS && FSL_BOOKE 974 help 975 This option allows you to set the maximum number of CAM slots that 976 will be used to map low memory. There are a limited number of slots 977 available and even more limited number that will fit in the L1 MMU. 978 However, using more entries will allow mapping more low memory. This 979 can be useful in optimizing the layout of kernel virtual memory. 980 981 Say N here unless you know what you are doing. 982 983config LOWMEM_CAM_NUM 984 depends on FSL_BOOKE 985 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL 986 default 3 987 988config DYNAMIC_MEMSTART 989 bool "Enable page aligned dynamic load address for kernel" 990 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x) 991 select NONSTATIC_KERNEL 992 help 993 This option enables the kernel to be loaded at any page aligned 994 physical address. The kernel creates a mapping from KERNELBASE to 995 the address where the kernel is loaded. The page size here implies 996 the TLB page size of the mapping for kernel on the particular platform. 997 Please refer to the init code for finding the TLB page size. 998 999 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE 1000 kernel image, where the only restriction is the page aligned kernel 1001 load address. When this option is enabled, the compile time physical 1002 address CONFIG_PHYSICAL_START is ignored. 1003 1004 This option is overridden by CONFIG_RELOCATABLE 1005 1006config PAGE_OFFSET_BOOL 1007 bool "Set custom page offset address" 1008 depends on ADVANCED_OPTIONS 1009 help 1010 This option allows you to set the kernel virtual address at which 1011 the kernel will map low memory. This can be useful in optimizing 1012 the virtual memory layout of the system. 1013 1014 Say N here unless you know what you are doing. 1015 1016config PAGE_OFFSET 1017 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL 1018 default "0xc0000000" 1019 1020config KERNEL_START_BOOL 1021 bool "Set custom kernel base address" 1022 depends on ADVANCED_OPTIONS 1023 help 1024 This option allows you to set the kernel virtual address at which 1025 the kernel will be loaded. Normally this should match PAGE_OFFSET 1026 however there are times (like kdump) that one might not want them 1027 to be the same. 1028 1029 Say N here unless you know what you are doing. 1030 1031config KERNEL_START 1032 hex "Virtual address of kernel base" if KERNEL_START_BOOL 1033 default PAGE_OFFSET if PAGE_OFFSET_BOOL 1034 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL 1035 default "0xc0000000" 1036 1037config PHYSICAL_START_BOOL 1038 bool "Set physical address where the kernel is loaded" 1039 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE 1040 help 1041 This gives the physical address where the kernel is loaded. 1042 1043 Say N here unless you know what you are doing. 1044 1045config PHYSICAL_START 1046 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL 1047 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL 1048 default "0x00000000" 1049 1050config PHYSICAL_ALIGN 1051 hex 1052 default "0x04000000" if FSL_BOOKE 1053 help 1054 This value puts the alignment restrictions on physical address 1055 where kernel is loaded and run from. Kernel is compiled for an 1056 address which meets above alignment restriction. 1057 1058config TASK_SIZE_BOOL 1059 bool "Set custom user task size" 1060 depends on ADVANCED_OPTIONS 1061 help 1062 This option allows you to set the amount of virtual address space 1063 allocated to user tasks. This can be useful in optimizing the 1064 virtual memory layout of the system. 1065 1066 Say N here unless you know what you are doing. 1067 1068config TASK_SIZE 1069 hex "Size of user task space" if TASK_SIZE_BOOL 1070 default "0x80000000" if PPC_8xx 1071 default "0xc0000000" 1072 1073config CONSISTENT_SIZE_BOOL 1074 bool "Set custom consistent memory pool size" 1075 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE 1076 help 1077 This option allows you to set the size of the 1078 consistent memory pool. This pool of virtual memory 1079 is used to make consistent memory allocations. 1080 1081config CONSISTENT_SIZE 1082 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL 1083 default "0x00200000" if NOT_COHERENT_CACHE 1084 1085config PIN_TLB 1086 bool "Pinned Kernel TLBs (860 ONLY)" 1087 depends on ADVANCED_OPTIONS && PPC_8xx && \ 1088 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX 1089 1090config PIN_TLB_DATA 1091 bool "Pinned TLB for DATA" 1092 depends on PIN_TLB 1093 default y 1094 1095config PIN_TLB_IMMR 1096 bool "Pinned TLB for IMMR" 1097 depends on PIN_TLB || PPC_EARLY_DEBUG_CPM 1098 default y 1099 1100config PIN_TLB_TEXT 1101 bool "Pinned TLB for TEXT" 1102 depends on PIN_TLB 1103 default y 1104endmenu 1105 1106if PPC64 1107# This value must have zeroes in the bottom 60 bits otherwise lots will break 1108config PAGE_OFFSET 1109 hex 1110 default "0xc000000000000000" 1111config KERNEL_START 1112 hex 1113 default "0xc000000000000000" 1114config PHYSICAL_START 1115 hex 1116 default "0x00000000" 1117endif 1118 1119config ARCH_RANDOM 1120 def_bool n 1121 1122config PPC_LIB_RHEAP 1123 bool 1124 1125source "arch/powerpc/kvm/Kconfig" 1126 1127source "kernel/livepatch/Kconfig" 1128