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 GENERIC_LOCKBREAK 107 bool 108 default y 109 depends on SMP && PREEMPT 110 111config GENERIC_HWEIGHT 112 bool 113 default y 114 115config PPC 116 bool 117 default y 118 # 119 # Please keep this list sorted alphabetically. 120 # 121 select ARCH_32BIT_OFF_T if PPC32 122 select ARCH_HAS_DEBUG_VIRTUAL 123 select ARCH_HAS_DEVMEM_IS_ALLOWED 124 select ARCH_HAS_ELF_RANDOMIZE 125 select ARCH_HAS_FORTIFY_SOURCE 126 select ARCH_HAS_GCOV_PROFILE_ALL 127 select ARCH_HAS_KCOV 128 select ARCH_HAS_MMIOWB if PPC64 129 select ARCH_HAS_PHYS_TO_DMA 130 select ARCH_HAS_PMEM_API if PPC64 131 select ARCH_HAS_PTE_SPECIAL 132 select ARCH_HAS_MEMBARRIER_CALLBACKS 133 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC64 134 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION) 135 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 136 select ARCH_HAS_UACCESS_FLUSHCACHE if PPC64 137 select ARCH_HAS_UBSAN_SANITIZE_ALL 138 select ARCH_HAS_ZONE_DEVICE if PPC_BOOK3S_64 139 select ARCH_HAVE_NMI_SAFE_CMPXCHG 140 select ARCH_KEEP_MEMBLOCK 141 select ARCH_MIGHT_HAVE_PC_PARPORT 142 select ARCH_MIGHT_HAVE_PC_SERIO 143 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX 144 select ARCH_SUPPORTS_ATOMIC_RMW 145 select ARCH_USE_BUILTIN_BSWAP 146 select ARCH_USE_CMPXCHG_LOCKREF if PPC64 147 select ARCH_WANT_IPC_PARSE_VERSION 148 select ARCH_WEAK_RELEASE_ACQUIRE 149 select BINFMT_ELF 150 select BUILDTIME_EXTABLE_SORT 151 select CLONE_BACKWARDS 152 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN 153 select DYNAMIC_FTRACE if FUNCTION_TRACER 154 select EDAC_ATOMIC_SCRUB 155 select EDAC_SUPPORT 156 select GENERIC_ATOMIC64 if PPC32 157 select GENERIC_CLOCKEVENTS 158 select GENERIC_CLOCKEVENTS_BROADCAST if SMP 159 select GENERIC_CMOS_UPDATE 160 select GENERIC_CPU_AUTOPROBE 161 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC 162 select GENERIC_IRQ_SHOW 163 select GENERIC_IRQ_SHOW_LEVEL 164 select GENERIC_PCI_IOMAP if PCI 165 select GENERIC_SMP_IDLE_THREAD 166 select GENERIC_STRNCPY_FROM_USER 167 select GENERIC_STRNLEN_USER 168 select GENERIC_TIME_VSYSCALL 169 select HAVE_ARCH_AUDITSYSCALL 170 select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU 171 select HAVE_ARCH_JUMP_LABEL 172 select HAVE_ARCH_KASAN if PPC32 173 select HAVE_ARCH_KGDB 174 select HAVE_ARCH_MMAP_RND_BITS 175 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT 176 select HAVE_ARCH_NVRAM_OPS 177 select HAVE_ARCH_SECCOMP_FILTER 178 select HAVE_ARCH_TRACEHOOK 179 select HAVE_C_RECORDMCOUNT 180 select HAVE_CBPF_JIT if !PPC64 181 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13) 182 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2) 183 select HAVE_CONTEXT_TRACKING if PPC64 184 select HAVE_DEBUG_KMEMLEAK 185 select HAVE_DEBUG_STACKOVERFLOW 186 select HAVE_DYNAMIC_FTRACE 187 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL 188 select HAVE_EBPF_JIT if PPC64 189 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU) 190 select HAVE_FTRACE_MCOUNT_RECORD 191 select HAVE_FUNCTION_ERROR_INJECTION 192 select HAVE_FUNCTION_GRAPH_TRACER 193 select HAVE_FUNCTION_TRACER 194 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC 195 select HAVE_GENERIC_GUP 196 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx) 197 select HAVE_IDE 198 select HAVE_IOREMAP_PROT 199 select HAVE_IRQ_EXIT_ON_IRQ_STACK 200 select HAVE_KERNEL_GZIP 201 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x 202 select HAVE_KPROBES 203 select HAVE_KPROBES_ON_FTRACE 204 select HAVE_KRETPROBES 205 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION 206 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS 207 select HAVE_MEMBLOCK_NODE_MAP 208 select HAVE_MOD_ARCH_SPECIFIC 209 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S) 210 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S) 211 select HAVE_OPROFILE 212 select HAVE_OPTPROBES if PPC64 213 select HAVE_PERF_EVENTS 214 select HAVE_PERF_EVENTS_NMI if PPC64 215 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH 216 select HAVE_PERF_REGS 217 select HAVE_PERF_USER_STACK_DUMP 218 select HAVE_RCU_TABLE_FREE if SMP 219 select HAVE_RCU_TABLE_NO_INVALIDATE if HAVE_RCU_TABLE_FREE 220 select HAVE_MMU_GATHER_PAGE_SIZE 221 select HAVE_REGS_AND_STACK_ACCESS_API 222 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && 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 OLD_SIGACTION if PPC32 236 select OLD_SIGSUSPEND 237 select PCI_DOMAINS if PCI 238 select PCI_SYSCALL if PCI 239 select PPC_DAWR if PPC64 240 select RTC_LIB 241 select SPARSE_IRQ 242 select SYSCTL_EXCEPTION_TRACE 243 select THREAD_INFO_IN_TASK 244 select VIRT_TO_BUS if !PPC64 245 # 246 # Please keep this list sorted alphabetically. 247 # 248 249config PPC_BARRIER_NOSPEC 250 bool 251 default y 252 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E 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 274config SCHED_OMIT_FRAME_POINTER 275 bool 276 default y 277 278config ARCH_MAY_HAVE_PC_FDC 279 bool 280 default PCI 281 282config PPC_UDBG_16550 283 bool 284 285config GENERIC_TBSYNC 286 bool 287 default y if PPC32 && SMP 288 289config AUDIT_ARCH 290 bool 291 default y 292 293config GENERIC_BUG 294 bool 295 default y 296 depends on BUG 297 298config SYS_SUPPORTS_APM_EMULATION 299 default y if PMAC_APM_EMU 300 bool 301 302config EPAPR_BOOT 303 bool 304 help 305 Used to allow a board to specify it wants an ePAPR compliant wrapper. 306 307config DEFAULT_UIMAGE 308 bool 309 help 310 Used to allow a board to specify it wants a uImage built by default 311 312config ARCH_HIBERNATION_POSSIBLE 313 bool 314 default y 315 316config ARCH_SUSPEND_POSSIBLE 317 def_bool y 318 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \ 319 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \ 320 || 44x || 40x 321 322config ARCH_SUSPEND_NONZERO_CPU 323 def_bool y 324 depends on PPC_POWERNV || PPC_PSERIES 325 326config PPC_DCR_NATIVE 327 bool 328 329config PPC_DCR_MMIO 330 bool 331 332config PPC_DCR 333 bool 334 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO 335 default y 336 337config PPC_OF_PLATFORM_PCI 338 bool 339 depends on PCI 340 depends on PPC64 # not supported on 32 bits yet 341 342config ARCH_SUPPORTS_DEBUG_PAGEALLOC 343 depends on PPC32 || PPC_BOOK3S_64 344 def_bool y 345 346config ARCH_SUPPORTS_UPROBES 347 def_bool y 348 349config PPC_ADV_DEBUG_REGS 350 bool 351 depends on 40x || BOOKE 352 default y 353 354config PPC_ADV_DEBUG_IACS 355 int 356 depends on PPC_ADV_DEBUG_REGS 357 default 4 if 44x 358 default 2 359 360config PPC_ADV_DEBUG_DACS 361 int 362 depends on PPC_ADV_DEBUG_REGS 363 default 2 364 365config PPC_ADV_DEBUG_DVCS 366 int 367 depends on PPC_ADV_DEBUG_REGS 368 default 2 if 44x 369 default 0 370 371config PPC_ADV_DEBUG_DAC_RANGE 372 bool 373 depends on PPC_ADV_DEBUG_REGS && 44x 374 default y 375 376config PPC_DAWR 377 bool 378 379config ZONE_DMA 380 bool 381 default y if PPC_BOOK3E_64 382 383config PGTABLE_LEVELS 384 int 385 default 2 if !PPC64 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 && PPC_BOOK3S_64 402 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_ENABLE_MEMORY_HOTREMOVE 480 def_bool y 481 482config PPC64_SUPPORTS_MEMORY_FAILURE 483 bool "Add support for memory hwpoison" 484 depends on PPC_BOOK3S_64 485 default "y" if PPC_POWERNV 486 select ARCH_SUPPORTS_MEMORY_FAILURE 487 488config KEXEC 489 bool "kexec system call" 490 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E 491 select KEXEC_CORE 492 help 493 kexec is a system call that implements the ability to shutdown your 494 current kernel, and to start another kernel. It is like a reboot 495 but it is independent of the system firmware. And like a reboot 496 you can start any kernel with it, not just Linux. 497 498 The name comes from the similarity to the exec system call. 499 500 It is an ongoing process to be certain the hardware in a machine 501 is properly shutdown, so do not be surprised if this code does not 502 initially work for you. As of this writing the exact hardware 503 interface is strongly in flux, so no good recommendation can be 504 made. 505 506config KEXEC_FILE 507 bool "kexec file based system call" 508 select KEXEC_CORE 509 select HAVE_IMA_KEXEC 510 select BUILD_BIN2C 511 depends on PPC64 512 depends on CRYPTO=y 513 depends on CRYPTO_SHA256=y 514 help 515 This is a new version of the kexec system call. This call is 516 file based and takes in file descriptors as system call arguments 517 for kernel and initramfs as opposed to a list of segments as is the 518 case for the older kexec call. 519 520config ARCH_HAS_KEXEC_PURGATORY 521 def_bool KEXEC_FILE 522 523config RELOCATABLE 524 bool "Build a relocatable kernel" 525 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE)) 526 select NONSTATIC_KERNEL 527 select MODULE_REL_CRCS if MODVERSIONS 528 help 529 This builds a kernel image that is capable of running at the 530 location the kernel is loaded at. For ppc32, there is no any 531 alignment restrictions, and this feature is a superset of 532 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use 533 16k-aligned base address. The kernel is linked as a 534 position-independent executable (PIE) and contains dynamic relocations 535 which are processed early in the bootup process. 536 537 One use is for the kexec on panic case where the recovery kernel 538 must live at a different physical address than the primary 539 kernel. 540 541 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address 542 it has been loaded at and the compile time physical addresses 543 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START 544 setting can still be useful to bootwrappers that need to know the 545 load address of the kernel (eg. u-boot/mkimage). 546 547config RELOCATABLE_TEST 548 bool "Test relocatable kernel" 549 depends on (PPC64 && RELOCATABLE) 550 help 551 This runs the relocatable kernel at the address it was initially 552 loaded at, which tends to be non-zero and therefore test the 553 relocation code. 554 555config CRASH_DUMP 556 bool "Build a dump capture kernel" 557 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP) 558 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE 559 help 560 Build a kernel suitable for use as a dump capture kernel. 561 The same kernel binary can be used as production kernel and dump 562 capture kernel. 563 564config FA_DUMP 565 bool "Firmware-assisted dump" 566 depends on PPC64 && PPC_RTAS 567 select CRASH_CORE 568 select CRASH_DUMP 569 help 570 A robust mechanism to get reliable kernel crash dump with 571 assistance from firmware. This approach does not use kexec, 572 instead firmware assists in booting the capture kernel 573 while preserving memory contents. Firmware-assisted dump 574 is meant to be a kdump replacement offering robustness and 575 speed not possible without system firmware assistance. 576 577 If unsure, say "N" 578 579config IRQ_ALL_CPUS 580 bool "Distribute interrupts on all CPUs by default" 581 depends on SMP 582 help 583 This option gives the kernel permission to distribute IRQs across 584 multiple CPUs. Saying N here will route all IRQs to the first 585 CPU. Generally saying Y is safe, although some problems have been 586 reported with SMP Power Macintoshes with this option enabled. 587 588config NUMA 589 bool "NUMA support" 590 depends on PPC64 591 default y if SMP && PPC_PSERIES 592 593config NODES_SHIFT 594 int 595 default "8" if PPC64 596 default "4" 597 depends on NEED_MULTIPLE_NODES 598 599config USE_PERCPU_NUMA_NODE_ID 600 def_bool y 601 depends on NUMA 602 603config HAVE_MEMORYLESS_NODES 604 def_bool y 605 depends on NUMA 606 607config ARCH_SELECT_MEMORY_MODEL 608 def_bool y 609 depends on PPC64 610 611config ARCH_FLATMEM_ENABLE 612 def_bool y 613 depends on (PPC64 && !NUMA) || PPC32 614 615config ARCH_SPARSEMEM_ENABLE 616 def_bool y 617 depends on PPC64 618 select SPARSEMEM_VMEMMAP_ENABLE 619 620config ARCH_SPARSEMEM_DEFAULT 621 def_bool y 622 depends on PPC_BOOK3S_64 623 624config SYS_SUPPORTS_HUGETLBFS 625 bool 626 627config ILLEGAL_POINTER_VALUE 628 hex 629 # This is roughly half way between the top of user space and the bottom 630 # of kernel space, which seems about as good as we can get. 631 default 0x5deadbeef0000000 if PPC64 632 default 0 633 634config ARCH_MEMORY_PROBE 635 def_bool y 636 depends on MEMORY_HOTPLUG 637 638# Some NUMA nodes have memory ranges that span 639# other nodes. Even though a pfn is valid and 640# between a node's start and end pfns, it may not 641# reside on that node. See memmap_init_zone() 642# for details. 643config NODES_SPAN_OTHER_NODES 644 def_bool y 645 depends on NEED_MULTIPLE_NODES 646 647config STDBINUTILS 648 bool "Using standard binutils settings" 649 depends on 44x 650 default y 651 help 652 Turning this option off allows you to select 256KB PAGE_SIZE on 44x. 653 Note, that kernel will be able to run only those applications, 654 which had been compiled using binutils later than 2.17.50.0.3 with 655 '-zmax-page-size' set to 256K (the default is 64K). Or, if using 656 the older binutils, you can patch them with a trivial patch, which 657 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000. 658 659choice 660 prompt "Page size" 661 default PPC_4K_PAGES 662 help 663 Select the kernel logical page size. Increasing the page size 664 will reduce software overhead at each page boundary, allow 665 hardware prefetch mechanisms to be more effective, and allow 666 larger dma transfers increasing IO efficiency and reducing 667 overhead. However the utilization of memory will increase. 668 For example, each cached file will using a multiple of the 669 page size to hold its contents and the difference between the 670 end of file and the end of page is wasted. 671 672 Some dedicated systems, such as software raid serving with 673 accelerated calculations, have shown significant increases. 674 675 If you configure a 64 bit kernel for 64k pages but the 676 processor does not support them, then the kernel will simulate 677 them with 4k pages, loading them on demand, but with the 678 reduced software overhead and larger internal fragmentation. 679 For the 32 bit kernel, a large page option will not be offered 680 unless it is supported by the configured processor. 681 682 If unsure, choose 4K_PAGES. 683 684config PPC_4K_PAGES 685 bool "4k page size" 686 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 687 688config PPC_16K_PAGES 689 bool "16k page size" 690 depends on 44x || PPC_8xx 691 692config PPC_64K_PAGES 693 bool "64k page size" 694 depends on 44x || PPC_BOOK3S_64 695 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 696 697config PPC_256K_PAGES 698 bool "256k page size" 699 depends on 44x && !STDBINUTILS 700 help 701 Make the page size 256k. 702 703 As the ELF standard only requires alignment to support page 704 sizes up to 64k, you will need to compile all of your user 705 space applications with a non-standard binutils settings 706 (see the STDBINUTILS description for details). 707 708 Say N unless you know what you are doing. 709 710endchoice 711 712config PPC_PAGE_SHIFT 713 int 714 default 18 if PPC_256K_PAGES 715 default 16 if PPC_64K_PAGES 716 default 14 if PPC_16K_PAGES 717 default 12 718 719config THREAD_SHIFT 720 int "Thread shift" if EXPERT 721 range 13 15 722 default "15" if PPC_256K_PAGES 723 default "14" if PPC64 724 default "13" 725 help 726 Used to define the stack size. The default is almost always what you 727 want. Only change this if you know what you are doing. 728 729config ETEXT_SHIFT_BOOL 730 bool "Set custom etext alignment" if STRICT_KERNEL_RWX && \ 731 (PPC_BOOK3S_32 || PPC_8xx) 732 depends on ADVANCED_OPTIONS 733 help 734 This option allows you to set the kernel end of text alignment. When 735 RAM is mapped by blocks, the alignment needs to fit the size and 736 number of possible blocks. The default should be OK for most configs. 737 738 Say N here unless you know what you are doing. 739 740config ETEXT_SHIFT 741 int "_etext shift" if ETEXT_SHIFT_BOOL 742 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32 743 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx 744 default 17 if STRICT_KERNEL_RWX && PPC_BOOK3S_32 745 default 19 if STRICT_KERNEL_RWX && PPC_8xx 746 default PPC_PAGE_SHIFT 747 help 748 On Book3S 32 (603+), IBATs are used to map kernel text. 749 Smaller is the alignment, greater is the number of necessary IBATs. 750 751 On 8xx, large pages (512kb or 8M) are used to map kernel linear 752 memory. Aligning to 8M reduces TLB misses as only 8M pages are used 753 in that case. 754 755config DATA_SHIFT_BOOL 756 bool "Set custom data alignment" if STRICT_KERNEL_RWX && \ 757 (PPC_BOOK3S_32 || PPC_8xx) 758 depends on ADVANCED_OPTIONS 759 help 760 This option allows you to set the kernel data alignment. When 761 RAM is mapped by blocks, the alignment needs to fit the size and 762 number of possible blocks. The default should be OK for most configs. 763 764 Say N here unless you know what you are doing. 765 766config DATA_SHIFT 767 int "Data shift" if DATA_SHIFT_BOOL 768 default 24 if STRICT_KERNEL_RWX && PPC64 769 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32 770 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx 771 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32 772 default 23 if STRICT_KERNEL_RWX && PPC_8xx 773 default PPC_PAGE_SHIFT 774 help 775 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO. 776 Smaller is the alignment, greater is the number of necessary DBATs. 777 778 On 8xx, large pages (512kb or 8M) are used to map kernel linear 779 memory. Aligning to 8M reduces TLB misses as only 8M pages are used 780 in that case. 781 782config FORCE_MAX_ZONEORDER 783 int "Maximum zone order" 784 range 8 9 if PPC64 && PPC_64K_PAGES 785 default "9" if PPC64 && PPC_64K_PAGES 786 range 13 13 if PPC64 && !PPC_64K_PAGES 787 default "13" if PPC64 && !PPC_64K_PAGES 788 range 9 64 if PPC32 && PPC_16K_PAGES 789 default "9" if PPC32 && PPC_16K_PAGES 790 range 7 64 if PPC32 && PPC_64K_PAGES 791 default "7" if PPC32 && PPC_64K_PAGES 792 range 5 64 if PPC32 && PPC_256K_PAGES 793 default "5" if PPC32 && PPC_256K_PAGES 794 range 11 64 795 default "11" 796 help 797 The kernel memory allocator divides physically contiguous memory 798 blocks into "zones", where each zone is a power of two number of 799 pages. This option selects the largest power of two that the kernel 800 keeps in the memory allocator. If you need to allocate very large 801 blocks of physically contiguous memory, then you may need to 802 increase this value. 803 804 This config option is actually maximum order plus one. For example, 805 a value of 11 means that the largest free memory block is 2^10 pages. 806 807 The page size is not necessarily 4KB. For example, on 64-bit 808 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep 809 this in mind when choosing a value for this option. 810 811config PPC_SUBPAGE_PROT 812 bool "Support setting protections for 4k subpages" 813 depends on PPC_BOOK3S_64 && PPC_64K_PAGES 814 help 815 This option adds support for a system call to allow user programs 816 to set access permissions (read/write, readonly, or no access) 817 on the 4k subpages of each 64k page. 818 819config PPC_COPRO_BASE 820 bool 821 822config SCHED_SMT 823 bool "SMT (Hyperthreading) scheduler support" 824 depends on PPC64 && SMP 825 help 826 SMT scheduler support improves the CPU scheduler's decision making 827 when dealing with POWER5 cpus at a cost of slightly increased 828 overhead in some places. If unsure say N here. 829 830config PPC_DENORMALISATION 831 bool "PowerPC denormalisation exception handling" 832 depends on PPC_BOOK3S_64 833 default "y" if PPC_POWERNV 834 help 835 Add support for handling denormalisation of single precision 836 values. Useful for bare metal only. If unsure say Y here. 837 838config CMDLINE_BOOL 839 bool "Default bootloader kernel arguments" 840 841config CMDLINE 842 string "Initial kernel command string" if CMDLINE_BOOL 843 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" if CMDLINE_BOOL 844 default "" 845 help 846 On some platforms, there is currently no way for the boot loader to 847 pass arguments to the kernel. For these platforms, you can supply 848 some command-line options at build time by entering them here. In 849 most cases you will need to specify the root device here. 850 851config CMDLINE_FORCE 852 bool "Always use the default kernel command string" 853 depends on CMDLINE_BOOL 854 help 855 Always use the default kernel command string, even if the boot 856 loader passes other arguments to the kernel. 857 This is useful if you cannot or don't want to change the 858 command-line options your boot loader passes to the kernel. 859 860config EXTRA_TARGETS 861 string "Additional default image types" 862 help 863 List additional targets to be built by the bootwrapper here (separated 864 by spaces). This is useful for targets that depend of device tree 865 files in the .dts directory. 866 867 Targets in this list will be build as part of the default build 868 target, or when the user does a 'make zImage' or a 869 'make zImage.initrd'. 870 871 If unsure, leave blank 872 873config ARCH_WANTS_FREEZER_CONTROL 874 def_bool y 875 depends on ADB_PMU 876 877source "kernel/power/Kconfig" 878 879config SECCOMP 880 bool "Enable seccomp to safely compute untrusted bytecode" 881 depends on PROC_FS 882 default y 883 help 884 This kernel feature is useful for number crunching applications 885 that may need to compute untrusted bytecode during their 886 execution. By using pipes or other transports made available to 887 the process as file descriptors supporting the read/write 888 syscalls, it's possible to isolate those applications in 889 their own address space using seccomp. Once seccomp is 890 enabled via /proc/<pid>/seccomp, it cannot be disabled 891 and the task is only allowed to execute a few safe syscalls 892 defined by each seccomp mode. 893 894 If unsure, say Y. Only embedded should say N here. 895 896config PPC_MEM_KEYS 897 prompt "PowerPC Memory Protection Keys" 898 def_bool y 899 depends on PPC_BOOK3S_64 900 select ARCH_USES_HIGH_VMA_FLAGS 901 select ARCH_HAS_PKEYS 902 help 903 Memory Protection Keys provides a mechanism for enforcing 904 page-based protections, but without requiring modification of the 905 page tables when an application changes protection domains. 906 907 For details, see Documentation/vm/protection-keys.rst 908 909 If unsure, say y. 910 911endmenu 912 913config ISA_DMA_API 914 bool 915 default PCI 916 917menu "Bus options" 918 919config ISA 920 bool "Support for ISA-bus hardware" 921 depends on PPC_CHRP 922 select PPC_I8259 923 help 924 Find out whether you have ISA slots on your motherboard. ISA is the 925 name of a bus system, i.e. the way the CPU talks to the other stuff 926 inside your box. If you have an Apple machine, say N here; if you 927 have an IBM RS/6000 or pSeries machine, say Y. If you have an 928 embedded board, consult your board documentation. 929 930config GENERIC_ISA_DMA 931 bool 932 depends on ISA_DMA_API 933 default y 934 935config PPC_INDIRECT_PCI 936 bool 937 depends on PCI 938 default y if 40x || 44x 939 940config SBUS 941 bool 942 943config FSL_SOC 944 bool 945 946config FSL_PCI 947 bool 948 select ARCH_HAS_DMA_SET_MASK 949 select PPC_INDIRECT_PCI 950 select PCI_QUIRKS 951 952config FSL_PMC 953 bool 954 default y 955 depends on SUSPEND && (PPC_85xx || PPC_86xx) 956 help 957 Freescale MPC85xx/MPC86xx power management controller support 958 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c 959 960config PPC4xx_CPM 961 bool 962 default y 963 depends on SUSPEND && (44x || 40x) 964 help 965 PPC4xx Clock Power Management (CPM) support (suspend/resume). 966 It also enables support for two different idle states (idle-wait 967 and idle-doze). 968 969config 4xx_SOC 970 bool 971 972config FSL_LBC 973 bool "Freescale Local Bus support" 974 help 975 Enables reporting of errors from the Freescale local bus 976 controller. Also contains some common code used by 977 drivers for specific local bus peripherals. 978 979config FSL_GTM 980 bool 981 depends on PPC_83xx || QUICC_ENGINE || CPM2 982 help 983 Freescale General-purpose Timers support 984 985config PCI_8260 986 bool 987 depends on PCI && 8260 988 select PPC_INDIRECT_PCI 989 default y 990 991config FSL_RIO 992 bool "Freescale Embedded SRIO Controller support" 993 depends on RAPIDIO = y && HAVE_RAPIDIO 994 default "n" 995 help 996 Include support for RapidIO controller on Freescale embedded 997 processors (MPC8548, MPC8641, etc). 998 999endmenu 1000 1001config NONSTATIC_KERNEL 1002 bool 1003 1004menu "Advanced setup" 1005 depends on PPC32 1006 1007config ADVANCED_OPTIONS 1008 bool "Prompt for advanced kernel configuration options" 1009 help 1010 This option will enable prompting for a variety of advanced kernel 1011 configuration options. These options can cause the kernel to not 1012 work if they are set incorrectly, but can be used to optimize certain 1013 aspects of kernel memory management. 1014 1015 Unless you know what you are doing, say N here. 1016 1017comment "Default settings for advanced configuration options are used" 1018 depends on !ADVANCED_OPTIONS 1019 1020config LOWMEM_SIZE_BOOL 1021 bool "Set maximum low memory" 1022 depends on ADVANCED_OPTIONS 1023 help 1024 This option allows you to set the maximum amount of memory which 1025 will be used as "low memory", that is, memory which the kernel can 1026 access directly, without having to set up a kernel virtual mapping. 1027 This can be useful in optimizing the layout of kernel virtual 1028 memory. 1029 1030 Say N here unless you know what you are doing. 1031 1032config LOWMEM_SIZE 1033 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL 1034 default "0x30000000" 1035 1036config LOWMEM_CAM_NUM_BOOL 1037 bool "Set number of CAMs to use to map low memory" 1038 depends on ADVANCED_OPTIONS && FSL_BOOKE 1039 help 1040 This option allows you to set the maximum number of CAM slots that 1041 will be used to map low memory. There are a limited number of slots 1042 available and even more limited number that will fit in the L1 MMU. 1043 However, using more entries will allow mapping more low memory. This 1044 can be useful in optimizing the layout of kernel virtual memory. 1045 1046 Say N here unless you know what you are doing. 1047 1048config LOWMEM_CAM_NUM 1049 depends on FSL_BOOKE 1050 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL 1051 default 3 1052 1053config DYNAMIC_MEMSTART 1054 bool "Enable page aligned dynamic load address for kernel" 1055 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x) 1056 select NONSTATIC_KERNEL 1057 help 1058 This option enables the kernel to be loaded at any page aligned 1059 physical address. The kernel creates a mapping from KERNELBASE to 1060 the address where the kernel is loaded. The page size here implies 1061 the TLB page size of the mapping for kernel on the particular platform. 1062 Please refer to the init code for finding the TLB page size. 1063 1064 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE 1065 kernel image, where the only restriction is the page aligned kernel 1066 load address. When this option is enabled, the compile time physical 1067 address CONFIG_PHYSICAL_START is ignored. 1068 1069 This option is overridden by CONFIG_RELOCATABLE 1070 1071config PAGE_OFFSET_BOOL 1072 bool "Set custom page offset address" 1073 depends on ADVANCED_OPTIONS 1074 help 1075 This option allows you to set the kernel virtual address at which 1076 the kernel will map low memory. This can be useful in optimizing 1077 the virtual memory layout of the system. 1078 1079 Say N here unless you know what you are doing. 1080 1081config PAGE_OFFSET 1082 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL 1083 default "0xc0000000" 1084 1085config KERNEL_START_BOOL 1086 bool "Set custom kernel base address" 1087 depends on ADVANCED_OPTIONS 1088 help 1089 This option allows you to set the kernel virtual address at which 1090 the kernel will be loaded. Normally this should match PAGE_OFFSET 1091 however there are times (like kdump) that one might not want them 1092 to be the same. 1093 1094 Say N here unless you know what you are doing. 1095 1096config KERNEL_START 1097 hex "Virtual address of kernel base" if KERNEL_START_BOOL 1098 default PAGE_OFFSET if PAGE_OFFSET_BOOL 1099 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL 1100 default "0xc0000000" 1101 1102config PHYSICAL_START_BOOL 1103 bool "Set physical address where the kernel is loaded" 1104 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE 1105 help 1106 This gives the physical address where the kernel is loaded. 1107 1108 Say N here unless you know what you are doing. 1109 1110config PHYSICAL_START 1111 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL 1112 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL 1113 default "0x00000000" 1114 1115config PHYSICAL_ALIGN 1116 hex 1117 default "0x04000000" if FSL_BOOKE 1118 help 1119 This value puts the alignment restrictions on physical address 1120 where kernel is loaded and run from. Kernel is compiled for an 1121 address which meets above alignment restriction. 1122 1123config TASK_SIZE_BOOL 1124 bool "Set custom user task size" 1125 depends on ADVANCED_OPTIONS 1126 help 1127 This option allows you to set the amount of virtual address space 1128 allocated to user tasks. This can be useful in optimizing the 1129 virtual memory layout of the system. 1130 1131 Say N here unless you know what you are doing. 1132 1133config TASK_SIZE 1134 hex "Size of user task space" if TASK_SIZE_BOOL 1135 default "0x80000000" if PPC_8xx 1136 default "0xc0000000" 1137 1138config CONSISTENT_SIZE_BOOL 1139 bool "Set custom consistent memory pool size" 1140 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE 1141 help 1142 This option allows you to set the size of the 1143 consistent memory pool. This pool of virtual memory 1144 is used to make consistent memory allocations. 1145 1146config CONSISTENT_SIZE 1147 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL 1148 default "0x00200000" if NOT_COHERENT_CACHE 1149 1150config PIN_TLB 1151 bool "Pinned Kernel TLBs (860 ONLY)" 1152 depends on ADVANCED_OPTIONS && PPC_8xx && \ 1153 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX 1154 1155config PIN_TLB_DATA 1156 bool "Pinned TLB for DATA" 1157 depends on PIN_TLB 1158 default y 1159 1160config PIN_TLB_IMMR 1161 bool "Pinned TLB for IMMR" 1162 depends on PIN_TLB || PPC_EARLY_DEBUG_CPM 1163 default y 1164 1165config PIN_TLB_TEXT 1166 bool "Pinned TLB for TEXT" 1167 depends on PIN_TLB 1168 default y 1169endmenu 1170 1171if PPC64 1172# This value must have zeroes in the bottom 60 bits otherwise lots will break 1173config PAGE_OFFSET 1174 hex 1175 default "0xc000000000000000" 1176config KERNEL_START 1177 hex 1178 default "0xc000000000000000" 1179config PHYSICAL_START 1180 hex 1181 default "0x00000000" 1182endif 1183 1184config ARCH_RANDOM 1185 def_bool n 1186 1187config PPC_LIB_RHEAP 1188 bool 1189 1190source "arch/powerpc/kvm/Kconfig" 1191 1192source "kernel/livepatch/Kconfig" 1193