1# SPDX-License-Identifier: GPL-2.0 2source "arch/powerpc/platforms/Kconfig.cputype" 3 4config 32BIT 5 bool 6 default y if PPC32 7 8config 64BIT 9 bool 10 default y if PPC64 11 12config MMU 13 bool 14 default y 15 16config ARCH_MMAP_RND_BITS_MAX 17 # On Book3S 64, the default virtual address space for 64-bit processes 18 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to 19 # 32T of address space (2^45), which should ensure a reasonable gap 20 # between bottom-up and top-down allocations for applications that 21 # consume "normal" amounts of address space. Book3S 64 only supports 64K 22 # and 4K page sizes. 23 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K) 24 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K) 25 # 26 # On all other 64-bit platforms (currently only Book3E), the virtual 27 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T 28 # of address space (2^44). Only 4K page sizes are supported. 29 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K) 30 # 31 # For 32-bit, use the compat values, as they're the same. 32 default ARCH_MMAP_RND_COMPAT_BITS_MAX 33 34config ARCH_MMAP_RND_BITS_MIN 35 # Allow randomisation to consume up to 1GB of address space (2^30). 36 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K) 37 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K) 38 # 39 # For 32-bit, use the compat values, as they're the same. 40 default ARCH_MMAP_RND_COMPAT_BITS_MIN 41 42config ARCH_MMAP_RND_COMPAT_BITS_MAX 43 # Total virtual address space for 32-bit processes is 2^31 (2GB). 44 # Allow randomisation to consume up to 512MB of address space (2^29). 45 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K) 46 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K) 47 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K) 48 default 17 # 17 = 29 (512MB) - 12 (4K) 49 50config ARCH_MMAP_RND_COMPAT_BITS_MIN 51 # Total virtual address space for 32-bit processes is 2^31 (2GB). 52 # Allow randomisation to consume up to 8MB of address space (2^23). 53 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K) 54 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K) 55 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K) 56 default 11 # 11 = 23 (8MB) - 12 (4K) 57 58config HAVE_SETUP_PER_CPU_AREA 59 def_bool PPC64 60 61config NEED_PER_CPU_EMBED_FIRST_CHUNK 62 def_bool PPC64 63 64config NR_IRQS 65 int "Number of virtual interrupt numbers" 66 range 32 32768 67 default "512" 68 help 69 This defines the number of virtual interrupt numbers the kernel 70 can manage. Virtual interrupt numbers are what you see in 71 /proc/interrupts. If you configure your system to have too few, 72 drivers will fail to load or worse - handle with care. 73 74config NMI_IPI 75 bool 76 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR) 77 default y 78 79config PPC_WATCHDOG 80 bool 81 depends on HARDLOCKUP_DETECTOR 82 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH 83 default y 84 help 85 This is a placeholder when the powerpc hardlockup detector 86 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is 87 seleted via the generic lockup detector menu which is why we 88 have no standalone config option for it here. 89 90config STACKTRACE_SUPPORT 91 bool 92 default y 93 94config TRACE_IRQFLAGS_SUPPORT 95 bool 96 default y 97 98config LOCKDEP_SUPPORT 99 bool 100 default y 101 102config GENERIC_LOCKBREAK 103 bool 104 default y 105 depends on SMP && PREEMPTION 106 107config GENERIC_HWEIGHT 108 bool 109 default y 110 111config PPC 112 bool 113 default y 114 # 115 # Please keep this list sorted alphabetically. 116 # 117 select ARCH_32BIT_OFF_T if PPC32 118 select ARCH_HAS_DEBUG_VIRTUAL 119 select ARCH_HAS_DEVMEM_IS_ALLOWED 120 select ARCH_HAS_ELF_RANDOMIZE 121 select ARCH_HAS_FORTIFY_SOURCE 122 select ARCH_HAS_GCOV_PROFILE_ALL 123 select ARCH_HAS_KCOV 124 select ARCH_HAS_HUGEPD if HUGETLB_PAGE 125 select ARCH_HAS_MMIOWB if PPC64 126 select ARCH_HAS_PHYS_TO_DMA 127 select ARCH_HAS_PMEM_API 128 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64 129 select ARCH_HAS_PTE_SPECIAL 130 select ARCH_HAS_MEMBARRIER_CALLBACKS 131 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64 132 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !HIBERNATION) 133 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 134 select ARCH_HAS_UACCESS_FLUSHCACHE 135 select ARCH_HAS_UACCESS_MCSAFE if PPC64 136 select ARCH_HAS_UBSAN_SANITIZE_ALL 137 select ARCH_HAVE_NMI_SAFE_CMPXCHG 138 select ARCH_KEEP_MEMBLOCK 139 select ARCH_MIGHT_HAVE_PC_PARPORT 140 select ARCH_MIGHT_HAVE_PC_SERIO 141 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX 142 select ARCH_SUPPORTS_ATOMIC_RMW 143 select ARCH_USE_BUILTIN_BSWAP 144 select ARCH_USE_CMPXCHG_LOCKREF if PPC64 145 select ARCH_WANT_IPC_PARSE_VERSION 146 select ARCH_WEAK_RELEASE_ACQUIRE 147 select BINFMT_ELF 148 select BUILDTIME_TABLE_SORT 149 select CLONE_BACKWARDS 150 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN 151 select DYNAMIC_FTRACE if FUNCTION_TRACER 152 select EDAC_ATOMIC_SCRUB 153 select EDAC_SUPPORT 154 select GENERIC_ATOMIC64 if PPC32 155 select GENERIC_CLOCKEVENTS 156 select GENERIC_CLOCKEVENTS_BROADCAST if SMP 157 select GENERIC_CMOS_UPDATE 158 select GENERIC_CPU_AUTOPROBE 159 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC 160 select GENERIC_EARLY_IOREMAP 161 select GENERIC_IRQ_SHOW 162 select GENERIC_IRQ_SHOW_LEVEL 163 select GENERIC_PCI_IOMAP if PCI 164 select GENERIC_SMP_IDLE_THREAD 165 select GENERIC_STRNCPY_FROM_USER 166 select GENERIC_STRNLEN_USER 167 select GENERIC_TIME_VSYSCALL 168 select HAVE_ARCH_AUDITSYSCALL 169 select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU 170 select HAVE_ARCH_JUMP_LABEL 171 select HAVE_ARCH_KASAN if PPC32 172 select HAVE_ARCH_KASAN_VMALLOC 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_ASM_MODVERSIONS 180 select HAVE_C_RECORDMCOUNT 181 select HAVE_CBPF_JIT if !PPC64 182 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13) 183 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2) 184 select HAVE_CONTEXT_TRACKING if PPC64 185 select HAVE_TIF_NOHZ if PPC64 186 select HAVE_COPY_THREAD_TLS 187 select HAVE_DEBUG_KMEMLEAK 188 select HAVE_DEBUG_STACKOVERFLOW 189 select HAVE_DYNAMIC_FTRACE 190 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL 191 select HAVE_EBPF_JIT if PPC64 192 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU) 193 select HAVE_FAST_GUP 194 select HAVE_FTRACE_MCOUNT_RECORD 195 select HAVE_FUNCTION_ERROR_INJECTION 196 select HAVE_FUNCTION_GRAPH_TRACER 197 select HAVE_FUNCTION_TRACER 198 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC 199 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx) 200 select HAVE_IDE 201 select HAVE_IOREMAP_PROT 202 select HAVE_IRQ_EXIT_ON_IRQ_STACK 203 select HAVE_KERNEL_GZIP 204 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE 205 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE 206 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x 207 select HAVE_KPROBES 208 select HAVE_KPROBES_ON_FTRACE 209 select HAVE_KRETPROBES 210 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION 211 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS 212 select HAVE_MEMBLOCK_NODE_MAP 213 select HAVE_MOD_ARCH_SPECIFIC 214 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S) 215 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S) 216 select HAVE_OPROFILE 217 select HAVE_OPTPROBES if PPC64 218 select HAVE_PERF_EVENTS 219 select HAVE_PERF_EVENTS_NMI if PPC64 220 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH 221 select HAVE_PERF_REGS 222 select HAVE_PERF_USER_STACK_DUMP 223 select MMU_GATHER_RCU_TABLE_FREE 224 select MMU_GATHER_PAGE_SIZE 225 select HAVE_REGS_AND_STACK_ACCESS_API 226 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN 227 select HAVE_SYSCALL_TRACEPOINTS 228 select HAVE_VIRT_CPU_ACCOUNTING 229 select HAVE_IRQ_TIME_ACCOUNTING 230 select HAVE_RSEQ 231 select IOMMU_HELPER if PPC64 232 select IRQ_DOMAIN 233 select IRQ_FORCED_THREADING 234 select MODULES_USE_ELF_RELA 235 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE 236 select NEED_SG_DMA_LENGTH 237 select OF 238 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE 239 select OF_EARLY_FLATTREE 240 select OLD_SIGACTION if PPC32 241 select OLD_SIGSUSPEND 242 select PCI_DOMAINS if PCI 243 select PCI_SYSCALL if PCI 244 select PPC_DAWR if PPC64 245 select RTC_LIB 246 select SPARSE_IRQ 247 select SYSCTL_EXCEPTION_TRACE 248 select THREAD_INFO_IN_TASK 249 select VIRT_TO_BUS if !PPC64 250 # 251 # Please keep this list sorted alphabetically. 252 # 253 254config PPC_BARRIER_NOSPEC 255 bool 256 default y 257 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E 258 259config EARLY_PRINTK 260 bool 261 default y 262 263config PANIC_TIMEOUT 264 int 265 default 180 266 267config COMPAT 268 bool 269 default y if PPC64 270 select COMPAT_BINFMT_ELF 271 select ARCH_WANT_OLD_COMPAT_IPC 272 select COMPAT_OLD_SIGACTION 273 274config SYSVIPC_COMPAT 275 bool 276 depends on COMPAT && SYSVIPC 277 default y 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 ARCH_SUSPEND_NONZERO_CPU 328 def_bool y 329 depends on PPC_POWERNV || PPC_PSERIES 330 331config PPC_DCR_NATIVE 332 bool 333 334config PPC_DCR_MMIO 335 bool 336 337config PPC_DCR 338 bool 339 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO 340 default y 341 342config PPC_OF_PLATFORM_PCI 343 bool 344 depends on PCI 345 depends on PPC64 # not supported on 32 bits yet 346 347config ARCH_SUPPORTS_DEBUG_PAGEALLOC 348 depends on PPC32 || PPC_BOOK3S_64 349 def_bool y 350 351config ARCH_SUPPORTS_UPROBES 352 def_bool y 353 354config PPC_ADV_DEBUG_REGS 355 bool 356 depends on 40x || BOOKE 357 default y 358 359config PPC_ADV_DEBUG_IACS 360 int 361 depends on PPC_ADV_DEBUG_REGS 362 default 4 if 44x 363 default 2 364 365config PPC_ADV_DEBUG_DACS 366 int 367 depends on PPC_ADV_DEBUG_REGS 368 default 2 369 370config PPC_ADV_DEBUG_DVCS 371 int 372 depends on PPC_ADV_DEBUG_REGS 373 default 2 if 44x 374 default 0 375 376config PPC_ADV_DEBUG_DAC_RANGE 377 bool 378 depends on PPC_ADV_DEBUG_REGS && 44x 379 default y 380 381config PPC_DAWR 382 bool 383 384config ZONE_DMA 385 bool 386 default y if PPC_BOOK3E_64 387 388config PGTABLE_LEVELS 389 int 390 default 2 if !PPC64 391 default 4 392 393source "arch/powerpc/sysdev/Kconfig" 394source "arch/powerpc/platforms/Kconfig" 395 396menu "Kernel options" 397 398config HIGHMEM 399 bool "High memory support" 400 depends on PPC32 401 402source "kernel/Kconfig.hz" 403 404config HUGETLB_PAGE_SIZE_VARIABLE 405 bool 406 depends on HUGETLB_PAGE && PPC_BOOK3S_64 407 default y 408 409config MATH_EMULATION 410 bool "Math emulation" 411 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE 412 help 413 Some PowerPC chips designed for embedded applications do not have 414 a floating-point unit and therefore do not implement the 415 floating-point instructions in the PowerPC instruction set. If you 416 say Y here, the kernel will include code to emulate a floating-point 417 unit, which will allow programs that use floating-point 418 instructions to run. 419 420 This is also useful to emulate missing (optional) instructions 421 such as fsqrt on cores that do have an FPU but do not implement 422 them (such as Freescale BookE). 423 424choice 425 prompt "Math emulation options" 426 default MATH_EMULATION_FULL 427 depends on MATH_EMULATION 428 429config MATH_EMULATION_FULL 430 bool "Emulate all the floating point instructions" 431 help 432 Select this option will enable the kernel to support to emulate 433 all the floating point instructions. If your SoC doesn't have 434 a FPU, you should select this. 435 436config MATH_EMULATION_HW_UNIMPLEMENTED 437 bool "Just emulate the FPU unimplemented instructions" 438 help 439 Select this if you know there does have a hardware FPU on your 440 SoC, but some floating point instructions are not implemented by that. 441 442endchoice 443 444config PPC_TRANSACTIONAL_MEM 445 bool "Transactional Memory support for POWERPC" 446 depends on PPC_BOOK3S_64 447 depends on SMP 448 select ALTIVEC 449 select VSX 450 help 451 Support user-mode Transactional Memory on POWERPC. 452 453config PPC_UV 454 bool "Ultravisor support" 455 depends on KVM_BOOK3S_HV_POSSIBLE 456 depends on DEVICE_PRIVATE 457 default n 458 help 459 This option paravirtualizes the kernel to run in POWER platforms that 460 supports the Protected Execution Facility (PEF). On such platforms, 461 the ultravisor firmware runs at a privilege level above the 462 hypervisor. 463 464 If unsure, say "N". 465 466config LD_HEAD_STUB_CATCH 467 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT 468 depends on PPC64 469 help 470 Very large kernels can cause linker branch stubs to be generated by 471 code in head_64.S, which moves the head text sections out of their 472 specified location. This option can work around the problem. 473 474 If unsure, say "N". 475 476config MPROFILE_KERNEL 477 depends on PPC64 && CPU_LITTLE_ENDIAN 478 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__) 479 480config HOTPLUG_CPU 481 bool "Support for enabling/disabling CPUs" 482 depends on SMP && (PPC_PSERIES || \ 483 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE) 484 help 485 Say Y here to be able to disable and re-enable individual 486 CPUs at runtime on SMP machines. 487 488 Say N if you are unsure. 489 490config ARCH_CPU_PROBE_RELEASE 491 def_bool y 492 depends on HOTPLUG_CPU 493 494config ARCH_ENABLE_MEMORY_HOTPLUG 495 def_bool y 496 497config ARCH_ENABLE_MEMORY_HOTREMOVE 498 def_bool y 499 500config PPC64_SUPPORTS_MEMORY_FAILURE 501 bool "Add support for memory hwpoison" 502 depends on PPC_BOOK3S_64 503 default "y" if PPC_POWERNV 504 select ARCH_SUPPORTS_MEMORY_FAILURE 505 506config KEXEC 507 bool "kexec system call" 508 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E 509 select KEXEC_CORE 510 help 511 kexec is a system call that implements the ability to shutdown your 512 current kernel, and to start another kernel. It is like a reboot 513 but it is independent of the system firmware. And like a reboot 514 you can start any kernel with it, not just Linux. 515 516 The name comes from the similarity to the exec system call. 517 518 It is an ongoing process to be certain the hardware in a machine 519 is properly shutdown, so do not be surprised if this code does not 520 initially work for you. As of this writing the exact hardware 521 interface is strongly in flux, so no good recommendation can be 522 made. 523 524config KEXEC_FILE 525 bool "kexec file based system call" 526 select KEXEC_CORE 527 select HAVE_IMA_KEXEC 528 select BUILD_BIN2C 529 select KEXEC_ELF 530 depends on PPC64 531 depends on CRYPTO=y 532 depends on CRYPTO_SHA256=y 533 help 534 This is a new version of the kexec system call. This call is 535 file based and takes in file descriptors as system call arguments 536 for kernel and initramfs as opposed to a list of segments as is the 537 case for the older kexec call. 538 539config ARCH_HAS_KEXEC_PURGATORY 540 def_bool KEXEC_FILE 541 542config RELOCATABLE 543 bool "Build a relocatable kernel" 544 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE)) 545 select NONSTATIC_KERNEL 546 select MODULE_REL_CRCS if MODVERSIONS 547 help 548 This builds a kernel image that is capable of running at the 549 location the kernel is loaded at. For ppc32, there is no any 550 alignment restrictions, and this feature is a superset of 551 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use 552 16k-aligned base address. The kernel is linked as a 553 position-independent executable (PIE) and contains dynamic relocations 554 which are processed early in the bootup process. 555 556 One use is for the kexec on panic case where the recovery kernel 557 must live at a different physical address than the primary 558 kernel. 559 560 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address 561 it has been loaded at and the compile time physical addresses 562 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START 563 setting can still be useful to bootwrappers that need to know the 564 load address of the kernel (eg. u-boot/mkimage). 565 566config RANDOMIZE_BASE 567 bool "Randomize the address of the kernel image" 568 depends on (FSL_BOOKE && FLATMEM && PPC32) 569 depends on RELOCATABLE 570 help 571 Randomizes the virtual address at which the kernel image is 572 loaded, as a security feature that deters exploit attempts 573 relying on knowledge of the location of kernel internals. 574 575 If unsure, say Y. 576 577config RELOCATABLE_TEST 578 bool "Test relocatable kernel" 579 depends on (PPC64 && RELOCATABLE) 580 help 581 This runs the relocatable kernel at the address it was initially 582 loaded at, which tends to be non-zero and therefore test the 583 relocation code. 584 585config CRASH_DUMP 586 bool "Build a dump capture kernel" 587 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP) 588 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE 589 help 590 Build a kernel suitable for use as a dump capture kernel. 591 The same kernel binary can be used as production kernel and dump 592 capture kernel. 593 594config FA_DUMP 595 bool "Firmware-assisted dump" 596 depends on PPC64 && (PPC_RTAS || PPC_POWERNV) 597 select CRASH_CORE 598 select CRASH_DUMP 599 help 600 A robust mechanism to get reliable kernel crash dump with 601 assistance from firmware. This approach does not use kexec, 602 instead firmware assists in booting the capture kernel 603 while preserving memory contents. Firmware-assisted dump 604 is meant to be a kdump replacement offering robustness and 605 speed not possible without system firmware assistance. 606 607 If unsure, say "y". Only special kernels like petitboot may 608 need to say "N" here. 609 610config PRESERVE_FA_DUMP 611 bool "Preserve Firmware-assisted dump" 612 depends on PPC64 && PPC_POWERNV && !FA_DUMP 613 help 614 On a kernel with FA_DUMP disabled, this option helps to preserve 615 crash data from a previously crash'ed kernel. Useful when the next 616 memory preserving kernel boot would process this crash data. 617 Petitboot kernel is the typical usecase for this option. 618 619config OPAL_CORE 620 bool "Export OPAL memory as /sys/firmware/opal/core" 621 depends on PPC64 && PPC_POWERNV 622 help 623 This option uses the MPIPL support in firmware to provide an 624 ELF core of OPAL memory after a crash. The ELF core is exported 625 as /sys/firmware/opal/core file which is helpful in debugging 626 OPAL crashes using GDB. 627 628config IRQ_ALL_CPUS 629 bool "Distribute interrupts on all CPUs by default" 630 depends on SMP 631 help 632 This option gives the kernel permission to distribute IRQs across 633 multiple CPUs. Saying N here will route all IRQs to the first 634 CPU. Generally saying Y is safe, although some problems have been 635 reported with SMP Power Macintoshes with this option enabled. 636 637config NUMA 638 bool "NUMA support" 639 depends on PPC64 640 default y if SMP && PPC_PSERIES 641 642config NODES_SHIFT 643 int 644 default "8" if PPC64 645 default "4" 646 depends on NEED_MULTIPLE_NODES 647 648config USE_PERCPU_NUMA_NODE_ID 649 def_bool y 650 depends on NUMA 651 652config HAVE_MEMORYLESS_NODES 653 def_bool y 654 depends on NUMA 655 656config ARCH_SELECT_MEMORY_MODEL 657 def_bool y 658 depends on PPC64 659 660config ARCH_FLATMEM_ENABLE 661 def_bool y 662 depends on (PPC64 && !NUMA) || PPC32 663 664config ARCH_SPARSEMEM_ENABLE 665 def_bool y 666 depends on PPC64 667 select SPARSEMEM_VMEMMAP_ENABLE 668 669config ARCH_SPARSEMEM_DEFAULT 670 def_bool y 671 depends on PPC_BOOK3S_64 672 673config SYS_SUPPORTS_HUGETLBFS 674 bool 675 676config ILLEGAL_POINTER_VALUE 677 hex 678 # This is roughly half way between the top of user space and the bottom 679 # of kernel space, which seems about as good as we can get. 680 default 0x5deadbeef0000000 if PPC64 681 default 0 682 683config ARCH_MEMORY_PROBE 684 def_bool y 685 depends on MEMORY_HOTPLUG 686 687# Some NUMA nodes have memory ranges that span 688# other nodes. Even though a pfn is valid and 689# between a node's start and end pfns, it may not 690# reside on that node. See memmap_init_zone() 691# for details. 692config NODES_SPAN_OTHER_NODES 693 def_bool y 694 depends on NEED_MULTIPLE_NODES 695 696config STDBINUTILS 697 bool "Using standard binutils settings" 698 depends on 44x 699 default y 700 help 701 Turning this option off allows you to select 256KB PAGE_SIZE on 44x. 702 Note, that kernel will be able to run only those applications, 703 which had been compiled using binutils later than 2.17.50.0.3 with 704 '-zmax-page-size' set to 256K (the default is 64K). Or, if using 705 the older binutils, you can patch them with a trivial patch, which 706 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000. 707 708choice 709 prompt "Page size" 710 default PPC_4K_PAGES 711 help 712 Select the kernel logical page size. Increasing the page size 713 will reduce software overhead at each page boundary, allow 714 hardware prefetch mechanisms to be more effective, and allow 715 larger dma transfers increasing IO efficiency and reducing 716 overhead. However the utilization of memory will increase. 717 For example, each cached file will using a multiple of the 718 page size to hold its contents and the difference between the 719 end of file and the end of page is wasted. 720 721 Some dedicated systems, such as software raid serving with 722 accelerated calculations, have shown significant increases. 723 724 If you configure a 64 bit kernel for 64k pages but the 725 processor does not support them, then the kernel will simulate 726 them with 4k pages, loading them on demand, but with the 727 reduced software overhead and larger internal fragmentation. 728 For the 32 bit kernel, a large page option will not be offered 729 unless it is supported by the configured processor. 730 731 If unsure, choose 4K_PAGES. 732 733config PPC_4K_PAGES 734 bool "4k page size" 735 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 736 737config PPC_16K_PAGES 738 bool "16k page size" 739 depends on 44x || PPC_8xx 740 741config PPC_64K_PAGES 742 bool "64k page size" 743 depends on 44x || PPC_BOOK3S_64 744 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 745 746config PPC_256K_PAGES 747 bool "256k page size" 748 depends on 44x && !STDBINUTILS 749 help 750 Make the page size 256k. 751 752 As the ELF standard only requires alignment to support page 753 sizes up to 64k, you will need to compile all of your user 754 space applications with a non-standard binutils settings 755 (see the STDBINUTILS description for details). 756 757 Say N unless you know what you are doing. 758 759endchoice 760 761config PPC_PAGE_SHIFT 762 int 763 default 18 if PPC_256K_PAGES 764 default 16 if PPC_64K_PAGES 765 default 14 if PPC_16K_PAGES 766 default 12 767 768config THREAD_SHIFT 769 int "Thread shift" if EXPERT 770 range 13 15 771 default "15" if PPC_256K_PAGES 772 default "14" if PPC64 773 default "13" 774 help 775 Used to define the stack size. The default is almost always what you 776 want. Only change this if you know what you are doing. 777 778config ETEXT_SHIFT_BOOL 779 bool "Set custom etext alignment" if STRICT_KERNEL_RWX && \ 780 (PPC_BOOK3S_32 || PPC_8xx) 781 depends on ADVANCED_OPTIONS 782 help 783 This option allows you to set the kernel end of text alignment. When 784 RAM is mapped by blocks, the alignment needs to fit the size and 785 number of possible blocks. The default should be OK for most configs. 786 787 Say N here unless you know what you are doing. 788 789config ETEXT_SHIFT 790 int "_etext shift" if ETEXT_SHIFT_BOOL 791 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32 792 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx 793 default 17 if STRICT_KERNEL_RWX && PPC_BOOK3S_32 794 default 19 if STRICT_KERNEL_RWX && PPC_8xx 795 default PPC_PAGE_SHIFT 796 help 797 On Book3S 32 (603+), IBATs are used to map kernel text. 798 Smaller is the alignment, greater is the number of necessary IBATs. 799 800 On 8xx, large pages (512kb or 8M) are used to map kernel linear 801 memory. Aligning to 8M reduces TLB misses as only 8M pages are used 802 in that case. 803 804config DATA_SHIFT_BOOL 805 bool "Set custom data alignment" if STRICT_KERNEL_RWX && \ 806 (PPC_BOOK3S_32 || PPC_8xx) 807 depends on ADVANCED_OPTIONS 808 help 809 This option allows you to set the kernel data alignment. When 810 RAM is mapped by blocks, the alignment needs to fit the size and 811 number of possible blocks. The default should be OK for most configs. 812 813 Say N here unless you know what you are doing. 814 815config DATA_SHIFT 816 int "Data shift" if DATA_SHIFT_BOOL 817 default 24 if STRICT_KERNEL_RWX && PPC64 818 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32 819 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx 820 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32 821 default 23 if STRICT_KERNEL_RWX && PPC_8xx 822 default PPC_PAGE_SHIFT 823 help 824 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO. 825 Smaller is the alignment, greater is the number of necessary DBATs. 826 827 On 8xx, large pages (512kb or 8M) are used to map kernel linear 828 memory. Aligning to 8M reduces TLB misses as only 8M pages are used 829 in that case. 830 831config FORCE_MAX_ZONEORDER 832 int "Maximum zone order" 833 range 8 9 if PPC64 && PPC_64K_PAGES 834 default "9" if PPC64 && PPC_64K_PAGES 835 range 13 13 if PPC64 && !PPC_64K_PAGES 836 default "13" if PPC64 && !PPC_64K_PAGES 837 range 9 64 if PPC32 && PPC_16K_PAGES 838 default "9" if PPC32 && PPC_16K_PAGES 839 range 7 64 if PPC32 && PPC_64K_PAGES 840 default "7" if PPC32 && PPC_64K_PAGES 841 range 5 64 if PPC32 && PPC_256K_PAGES 842 default "5" if PPC32 && PPC_256K_PAGES 843 range 11 64 844 default "11" 845 help 846 The kernel memory allocator divides physically contiguous memory 847 blocks into "zones", where each zone is a power of two number of 848 pages. This option selects the largest power of two that the kernel 849 keeps in the memory allocator. If you need to allocate very large 850 blocks of physically contiguous memory, then you may need to 851 increase this value. 852 853 This config option is actually maximum order plus one. For example, 854 a value of 11 means that the largest free memory block is 2^10 pages. 855 856 The page size is not necessarily 4KB. For example, on 64-bit 857 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep 858 this in mind when choosing a value for this option. 859 860config PPC_SUBPAGE_PROT 861 bool "Support setting protections for 4k subpages" 862 depends on PPC_BOOK3S_64 && PPC_64K_PAGES 863 help 864 This option adds support for a system call to allow user programs 865 to set access permissions (read/write, readonly, or no access) 866 on the 4k subpages of each 64k page. 867 868config PPC_COPRO_BASE 869 bool 870 871config SCHED_SMT 872 bool "SMT (Hyperthreading) scheduler support" 873 depends on PPC64 && SMP 874 help 875 SMT scheduler support improves the CPU scheduler's decision making 876 when dealing with POWER5 cpus at a cost of slightly increased 877 overhead in some places. If unsure say N here. 878 879config PPC_DENORMALISATION 880 bool "PowerPC denormalisation exception handling" 881 depends on PPC_BOOK3S_64 882 default "y" if PPC_POWERNV 883 help 884 Add support for handling denormalisation of single precision 885 values. Useful for bare metal only. If unsure say Y here. 886 887config CMDLINE_BOOL 888 bool "Default bootloader kernel arguments" 889 890config CMDLINE 891 string "Initial kernel command string" if CMDLINE_BOOL 892 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" if CMDLINE_BOOL 893 default "" 894 help 895 On some platforms, there is currently no way for the boot loader to 896 pass arguments to the kernel. For these platforms, you can supply 897 some command-line options at build time by entering them here. In 898 most cases you will need to specify the root device here. 899 900choice 901 prompt "Kernel command line type" if CMDLINE != "" 902 default CMDLINE_FROM_BOOTLOADER 903 904config CMDLINE_FROM_BOOTLOADER 905 bool "Use bootloader kernel arguments if available" 906 help 907 Uses the command-line options passed by the boot loader. If 908 the boot loader doesn't provide any, the default kernel command 909 string provided in CMDLINE will be used. 910 911config CMDLINE_EXTEND 912 bool "Extend bootloader kernel arguments" 913 help 914 The command-line arguments provided by the boot loader will be 915 appended to the default kernel command string. 916 917config CMDLINE_FORCE 918 bool "Always use the default kernel command string" 919 help 920 Always use the default kernel command string, even if the boot 921 loader passes other arguments to the kernel. 922 This is useful if you cannot or don't want to change the 923 command-line options your boot loader passes to the kernel. 924 925endchoice 926 927config EXTRA_TARGETS 928 string "Additional default image types" 929 help 930 List additional targets to be built by the bootwrapper here (separated 931 by spaces). This is useful for targets that depend of device tree 932 files in the .dts directory. 933 934 Targets in this list will be build as part of the default build 935 target, or when the user does a 'make zImage' or a 936 'make zImage.initrd'. 937 938 If unsure, leave blank 939 940config ARCH_WANTS_FREEZER_CONTROL 941 def_bool y 942 depends on ADB_PMU 943 944source "kernel/power/Kconfig" 945 946config SECCOMP 947 bool "Enable seccomp to safely compute untrusted bytecode" 948 depends on PROC_FS 949 default y 950 help 951 This kernel feature is useful for number crunching applications 952 that may need to compute untrusted bytecode during their 953 execution. By using pipes or other transports made available to 954 the process as file descriptors supporting the read/write 955 syscalls, it's possible to isolate those applications in 956 their own address space using seccomp. Once seccomp is 957 enabled via /proc/<pid>/seccomp, it cannot be disabled 958 and the task is only allowed to execute a few safe syscalls 959 defined by each seccomp mode. 960 961 If unsure, say Y. Only embedded should say N here. 962 963config PPC_MEM_KEYS 964 prompt "PowerPC Memory Protection Keys" 965 def_bool y 966 depends on PPC_BOOK3S_64 967 select ARCH_USES_HIGH_VMA_FLAGS 968 select ARCH_HAS_PKEYS 969 help 970 Memory Protection Keys provides a mechanism for enforcing 971 page-based protections, but without requiring modification of the 972 page tables when an application changes protection domains. 973 974 For details, see Documentation/core-api/protection-keys.rst 975 976 If unsure, say y. 977 978config PPC_SECURE_BOOT 979 prompt "Enable secure boot support" 980 bool 981 depends on PPC_POWERNV 982 depends on IMA_ARCH_POLICY 983 imply IMA_SECURE_AND_OR_TRUSTED_BOOT 984 help 985 Systems with firmware secure boot enabled need to define security 986 policies to extend secure boot to the OS. This config allows a user 987 to enable OS secure boot on systems that have firmware support for 988 it. If in doubt say N. 989 990config PPC_SECVAR_SYSFS 991 bool "Enable sysfs interface for POWER secure variables" 992 default y 993 depends on PPC_SECURE_BOOT 994 depends on SYSFS 995 help 996 POWER secure variables are managed and controlled by firmware. 997 These variables are exposed to userspace via sysfs to enable 998 read/write operations on these variables. Say Y if you have 999 secure boot enabled and want to expose variables to userspace. 1000 1001endmenu 1002 1003config ISA_DMA_API 1004 bool 1005 default PCI 1006 1007menu "Bus options" 1008 1009config ISA 1010 bool "Support for ISA-bus hardware" 1011 depends on PPC_CHRP 1012 select PPC_I8259 1013 help 1014 Find out whether you have ISA slots on your motherboard. ISA is the 1015 name of a bus system, i.e. the way the CPU talks to the other stuff 1016 inside your box. If you have an Apple machine, say N here; if you 1017 have an IBM RS/6000 or pSeries machine, say Y. If you have an 1018 embedded board, consult your board documentation. 1019 1020config GENERIC_ISA_DMA 1021 bool 1022 depends on ISA_DMA_API 1023 default y 1024 1025config PPC_INDIRECT_PCI 1026 bool 1027 depends on PCI 1028 default y if 40x || 44x 1029 1030config SBUS 1031 bool 1032 1033config FSL_SOC 1034 bool 1035 1036config FSL_PCI 1037 bool 1038 select ARCH_HAS_DMA_SET_MASK 1039 select PPC_INDIRECT_PCI 1040 select PCI_QUIRKS 1041 1042config FSL_PMC 1043 bool 1044 default y 1045 depends on SUSPEND && (PPC_85xx || PPC_86xx) 1046 help 1047 Freescale MPC85xx/MPC86xx power management controller support 1048 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c 1049 1050config PPC4xx_CPM 1051 bool 1052 default y 1053 depends on SUSPEND && (44x || 40x) 1054 help 1055 PPC4xx Clock Power Management (CPM) support (suspend/resume). 1056 It also enables support for two different idle states (idle-wait 1057 and idle-doze). 1058 1059config 4xx_SOC 1060 bool 1061 1062config FSL_LBC 1063 bool "Freescale Local Bus support" 1064 help 1065 Enables reporting of errors from the Freescale local bus 1066 controller. Also contains some common code used by 1067 drivers for specific local bus peripherals. 1068 1069config FSL_GTM 1070 bool 1071 depends on PPC_83xx || QUICC_ENGINE || CPM2 1072 help 1073 Freescale General-purpose Timers support 1074 1075config PCI_8260 1076 bool 1077 depends on PCI && 8260 1078 select PPC_INDIRECT_PCI 1079 default y 1080 1081config FSL_RIO 1082 bool "Freescale Embedded SRIO Controller support" 1083 depends on RAPIDIO = y && HAVE_RAPIDIO 1084 default "n" 1085 help 1086 Include support for RapidIO controller on Freescale embedded 1087 processors (MPC8548, MPC8641, etc). 1088 1089endmenu 1090 1091config NONSTATIC_KERNEL 1092 bool 1093 1094menu "Advanced setup" 1095 depends on PPC32 1096 1097config ADVANCED_OPTIONS 1098 bool "Prompt for advanced kernel configuration options" 1099 help 1100 This option will enable prompting for a variety of advanced kernel 1101 configuration options. These options can cause the kernel to not 1102 work if they are set incorrectly, but can be used to optimize certain 1103 aspects of kernel memory management. 1104 1105 Unless you know what you are doing, say N here. 1106 1107comment "Default settings for advanced configuration options are used" 1108 depends on !ADVANCED_OPTIONS 1109 1110config LOWMEM_SIZE_BOOL 1111 bool "Set maximum low memory" 1112 depends on ADVANCED_OPTIONS 1113 help 1114 This option allows you to set the maximum amount of memory which 1115 will be used as "low memory", that is, memory which the kernel can 1116 access directly, without having to set up a kernel virtual mapping. 1117 This can be useful in optimizing the layout of kernel virtual 1118 memory. 1119 1120 Say N here unless you know what you are doing. 1121 1122config LOWMEM_SIZE 1123 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL 1124 default "0x30000000" 1125 1126config LOWMEM_CAM_NUM_BOOL 1127 bool "Set number of CAMs to use to map low memory" 1128 depends on ADVANCED_OPTIONS && FSL_BOOKE 1129 help 1130 This option allows you to set the maximum number of CAM slots that 1131 will be used to map low memory. There are a limited number of slots 1132 available and even more limited number that will fit in the L1 MMU. 1133 However, using more entries will allow mapping more low memory. This 1134 can be useful in optimizing the layout of kernel virtual memory. 1135 1136 Say N here unless you know what you are doing. 1137 1138config LOWMEM_CAM_NUM 1139 depends on FSL_BOOKE 1140 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL 1141 default 3 1142 1143config DYNAMIC_MEMSTART 1144 bool "Enable page aligned dynamic load address for kernel" 1145 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x) 1146 select NONSTATIC_KERNEL 1147 help 1148 This option enables the kernel to be loaded at any page aligned 1149 physical address. The kernel creates a mapping from KERNELBASE to 1150 the address where the kernel is loaded. The page size here implies 1151 the TLB page size of the mapping for kernel on the particular platform. 1152 Please refer to the init code for finding the TLB page size. 1153 1154 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE 1155 kernel image, where the only restriction is the page aligned kernel 1156 load address. When this option is enabled, the compile time physical 1157 address CONFIG_PHYSICAL_START is ignored. 1158 1159 This option is overridden by CONFIG_RELOCATABLE 1160 1161config PAGE_OFFSET_BOOL 1162 bool "Set custom page offset address" 1163 depends on ADVANCED_OPTIONS 1164 help 1165 This option allows you to set the kernel virtual address at which 1166 the kernel will map low memory. This can be useful in optimizing 1167 the virtual memory layout of the system. 1168 1169 Say N here unless you know what you are doing. 1170 1171config PAGE_OFFSET 1172 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL 1173 default "0xc0000000" 1174 1175config KERNEL_START_BOOL 1176 bool "Set custom kernel base address" 1177 depends on ADVANCED_OPTIONS 1178 help 1179 This option allows you to set the kernel virtual address at which 1180 the kernel will be loaded. Normally this should match PAGE_OFFSET 1181 however there are times (like kdump) that one might not want them 1182 to be the same. 1183 1184 Say N here unless you know what you are doing. 1185 1186config KERNEL_START 1187 hex "Virtual address of kernel base" if KERNEL_START_BOOL 1188 default PAGE_OFFSET if PAGE_OFFSET_BOOL 1189 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL 1190 default "0xc0000000" 1191 1192config PHYSICAL_START_BOOL 1193 bool "Set physical address where the kernel is loaded" 1194 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE 1195 help 1196 This gives the physical address where the kernel is loaded. 1197 1198 Say N here unless you know what you are doing. 1199 1200config PHYSICAL_START 1201 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL 1202 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL 1203 default "0x00000000" 1204 1205config PHYSICAL_ALIGN 1206 hex 1207 default "0x04000000" if FSL_BOOKE 1208 help 1209 This value puts the alignment restrictions on physical address 1210 where kernel is loaded and run from. Kernel is compiled for an 1211 address which meets above alignment restriction. 1212 1213config TASK_SIZE_BOOL 1214 bool "Set custom user task size" 1215 depends on ADVANCED_OPTIONS 1216 help 1217 This option allows you to set the amount of virtual address space 1218 allocated to user tasks. This can be useful in optimizing the 1219 virtual memory layout of the system. 1220 1221 Say N here unless you know what you are doing. 1222 1223config TASK_SIZE 1224 hex "Size of user task space" if TASK_SIZE_BOOL 1225 default "0x80000000" if PPC_8xx 1226 default "0xc0000000" 1227 1228config PIN_TLB 1229 bool "Pinned Kernel TLBs (860 ONLY)" 1230 depends on ADVANCED_OPTIONS && PPC_8xx && \ 1231 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX 1232 1233config PIN_TLB_DATA 1234 bool "Pinned TLB for DATA" 1235 depends on PIN_TLB 1236 default y 1237 1238config PIN_TLB_IMMR 1239 bool "Pinned TLB for IMMR" 1240 depends on PIN_TLB || PPC_EARLY_DEBUG_CPM 1241 default y 1242 1243config PIN_TLB_TEXT 1244 bool "Pinned TLB for TEXT" 1245 depends on PIN_TLB 1246 default y 1247endmenu 1248 1249if PPC64 1250# This value must have zeroes in the bottom 60 bits otherwise lots will break 1251config PAGE_OFFSET 1252 hex 1253 default "0xc000000000000000" 1254config KERNEL_START 1255 hex 1256 default "0xc000000000000000" 1257config PHYSICAL_START 1258 hex 1259 default "0x00000000" 1260endif 1261 1262config ARCH_RANDOM 1263 def_bool n 1264 1265config PPC_LIB_RHEAP 1266 bool 1267 1268source "arch/powerpc/kvm/Kconfig" 1269 1270source "kernel/livepatch/Kconfig" 1271