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_HUGEPD if HUGETLB_PAGE 129 select ARCH_HAS_MMIOWB if PPC64 130 select ARCH_HAS_PHYS_TO_DMA 131 select ARCH_HAS_PMEM_API 132 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64 133 select ARCH_HAS_PTE_SPECIAL 134 select ARCH_HAS_MEMBARRIER_CALLBACKS 135 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64 136 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION) 137 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 138 select ARCH_HAS_UACCESS_FLUSHCACHE 139 select ARCH_HAS_UACCESS_MCSAFE if PPC64 140 select ARCH_HAS_UBSAN_SANITIZE_ALL 141 select ARCH_HAVE_NMI_SAFE_CMPXCHG 142 select ARCH_KEEP_MEMBLOCK 143 select ARCH_MIGHT_HAVE_PC_PARPORT 144 select ARCH_MIGHT_HAVE_PC_SERIO 145 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX 146 select ARCH_SUPPORTS_ATOMIC_RMW 147 select ARCH_USE_BUILTIN_BSWAP 148 select ARCH_USE_CMPXCHG_LOCKREF if PPC64 149 select ARCH_WANT_IPC_PARSE_VERSION 150 select ARCH_WEAK_RELEASE_ACQUIRE 151 select BINFMT_ELF 152 select BUILDTIME_EXTABLE_SORT 153 select CLONE_BACKWARDS 154 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN 155 select DYNAMIC_FTRACE if FUNCTION_TRACER 156 select EDAC_ATOMIC_SCRUB 157 select EDAC_SUPPORT 158 select GENERIC_ATOMIC64 if PPC32 159 select GENERIC_CLOCKEVENTS 160 select GENERIC_CLOCKEVENTS_BROADCAST if SMP 161 select GENERIC_CMOS_UPDATE 162 select GENERIC_CPU_AUTOPROBE 163 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC 164 select GENERIC_EARLY_IOREMAP 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_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU 174 select HAVE_ARCH_JUMP_LABEL 175 select HAVE_ARCH_KASAN if PPC32 176 select HAVE_ARCH_KGDB 177 select HAVE_ARCH_MMAP_RND_BITS 178 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT 179 select HAVE_ARCH_NVRAM_OPS 180 select HAVE_ARCH_SECCOMP_FILTER 181 select HAVE_ARCH_TRACEHOOK 182 select HAVE_ASM_MODVERSIONS 183 select HAVE_C_RECORDMCOUNT 184 select HAVE_CBPF_JIT if !PPC64 185 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13) 186 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2) 187 select HAVE_CONTEXT_TRACKING if PPC64 188 select HAVE_COPY_THREAD_TLS 189 select HAVE_DEBUG_KMEMLEAK 190 select HAVE_DEBUG_STACKOVERFLOW 191 select HAVE_DYNAMIC_FTRACE 192 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL 193 select HAVE_EBPF_JIT if PPC64 194 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU) 195 select HAVE_FAST_GUP 196 select HAVE_FTRACE_MCOUNT_RECORD 197 select HAVE_FUNCTION_ERROR_INJECTION 198 select HAVE_FUNCTION_GRAPH_TRACER 199 select HAVE_FUNCTION_TRACER 200 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC 201 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx) 202 select HAVE_IDE 203 select HAVE_IOREMAP_PROT 204 select HAVE_IRQ_EXIT_ON_IRQ_STACK 205 select HAVE_KERNEL_GZIP 206 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE 207 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE 208 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x 209 select HAVE_KPROBES 210 select HAVE_KPROBES_ON_FTRACE 211 select HAVE_KRETPROBES 212 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION 213 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS 214 select HAVE_MEMBLOCK_NODE_MAP 215 select HAVE_MOD_ARCH_SPECIFIC 216 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S) 217 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S) 218 select HAVE_OPROFILE 219 select HAVE_OPTPROBES if PPC64 220 select HAVE_PERF_EVENTS 221 select HAVE_PERF_EVENTS_NMI if PPC64 222 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH 223 select HAVE_PERF_REGS 224 select HAVE_PERF_USER_STACK_DUMP 225 select HAVE_RCU_TABLE_FREE if SMP 226 select HAVE_RCU_TABLE_NO_INVALIDATE if HAVE_RCU_TABLE_FREE 227 select HAVE_MMU_GATHER_PAGE_SIZE 228 select HAVE_REGS_AND_STACK_ACCESS_API 229 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN 230 select HAVE_SYSCALL_TRACEPOINTS 231 select HAVE_VIRT_CPU_ACCOUNTING 232 select HAVE_IRQ_TIME_ACCOUNTING 233 select HAVE_RSEQ 234 select IOMMU_HELPER if PPC64 235 select IRQ_DOMAIN 236 select IRQ_FORCED_THREADING 237 select MODULES_USE_ELF_RELA 238 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE 239 select NEED_SG_DMA_LENGTH 240 select OF 241 select OF_EARLY_FLATTREE 242 select OLD_SIGACTION if PPC32 243 select OLD_SIGSUSPEND 244 select PCI_DOMAINS if PCI 245 select PCI_SYSCALL if PCI 246 select PPC_DAWR if PPC64 247 select RTC_LIB 248 select SPARSE_IRQ 249 select SYSCTL_EXCEPTION_TRACE 250 select THREAD_INFO_IN_TASK 251 select VIRT_TO_BUS if !PPC64 252 # 253 # Please keep this list sorted alphabetically. 254 # 255 256config PPC_BARRIER_NOSPEC 257 bool 258 default y 259 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E 260 261config EARLY_PRINTK 262 bool 263 default y 264 265config PANIC_TIMEOUT 266 int 267 default 180 268 269config COMPAT 270 bool 271 default y if PPC64 272 select COMPAT_BINFMT_ELF 273 select ARCH_WANT_OLD_COMPAT_IPC 274 select COMPAT_OLD_SIGACTION 275 276config SYSVIPC_COMPAT 277 bool 278 depends on COMPAT && SYSVIPC 279 default y 280 281config SCHED_OMIT_FRAME_POINTER 282 bool 283 default y 284 285config ARCH_MAY_HAVE_PC_FDC 286 bool 287 default PCI 288 289config PPC_UDBG_16550 290 bool 291 292config GENERIC_TBSYNC 293 bool 294 default y if PPC32 && SMP 295 296config AUDIT_ARCH 297 bool 298 default y 299 300config GENERIC_BUG 301 bool 302 default y 303 depends on BUG 304 305config SYS_SUPPORTS_APM_EMULATION 306 default y if PMAC_APM_EMU 307 bool 308 309config EPAPR_BOOT 310 bool 311 help 312 Used to allow a board to specify it wants an ePAPR compliant wrapper. 313 314config DEFAULT_UIMAGE 315 bool 316 help 317 Used to allow a board to specify it wants a uImage built by default 318 319config ARCH_HIBERNATION_POSSIBLE 320 bool 321 default y 322 323config ARCH_SUSPEND_POSSIBLE 324 def_bool y 325 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \ 326 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \ 327 || 44x || 40x 328 329config ARCH_SUSPEND_NONZERO_CPU 330 def_bool y 331 depends on PPC_POWERNV || PPC_PSERIES 332 333config PPC_DCR_NATIVE 334 bool 335 336config PPC_DCR_MMIO 337 bool 338 339config PPC_DCR 340 bool 341 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO 342 default y 343 344config PPC_OF_PLATFORM_PCI 345 bool 346 depends on PCI 347 depends on PPC64 # not supported on 32 bits yet 348 349config ARCH_SUPPORTS_DEBUG_PAGEALLOC 350 depends on PPC32 || PPC_BOOK3S_64 351 def_bool y 352 353config ARCH_SUPPORTS_UPROBES 354 def_bool y 355 356config PPC_ADV_DEBUG_REGS 357 bool 358 depends on 40x || BOOKE 359 default y 360 361config PPC_ADV_DEBUG_IACS 362 int 363 depends on PPC_ADV_DEBUG_REGS 364 default 4 if 44x 365 default 2 366 367config PPC_ADV_DEBUG_DACS 368 int 369 depends on PPC_ADV_DEBUG_REGS 370 default 2 371 372config PPC_ADV_DEBUG_DVCS 373 int 374 depends on PPC_ADV_DEBUG_REGS 375 default 2 if 44x 376 default 0 377 378config PPC_ADV_DEBUG_DAC_RANGE 379 bool 380 depends on PPC_ADV_DEBUG_REGS && 44x 381 default y 382 383config PPC_DAWR 384 bool 385 386config ZONE_DMA 387 bool 388 default y if PPC_BOOK3E_64 389 390config PGTABLE_LEVELS 391 int 392 default 2 if !PPC64 393 default 4 394 395source "arch/powerpc/sysdev/Kconfig" 396source "arch/powerpc/platforms/Kconfig" 397 398menu "Kernel options" 399 400config HIGHMEM 401 bool "High memory support" 402 depends on PPC32 403 404source "kernel/Kconfig.hz" 405 406config HUGETLB_PAGE_SIZE_VARIABLE 407 bool 408 depends on HUGETLB_PAGE && PPC_BOOK3S_64 409 default y 410 411config MATH_EMULATION 412 bool "Math emulation" 413 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE 414 help 415 Some PowerPC chips designed for embedded applications do not have 416 a floating-point unit and therefore do not implement the 417 floating-point instructions in the PowerPC instruction set. If you 418 say Y here, the kernel will include code to emulate a floating-point 419 unit, which will allow programs that use floating-point 420 instructions to run. 421 422 This is also useful to emulate missing (optional) instructions 423 such as fsqrt on cores that do have an FPU but do not implement 424 them (such as Freescale BookE). 425 426choice 427 prompt "Math emulation options" 428 default MATH_EMULATION_FULL 429 depends on MATH_EMULATION 430 431config MATH_EMULATION_FULL 432 bool "Emulate all the floating point instructions" 433 help 434 Select this option will enable the kernel to support to emulate 435 all the floating point instructions. If your SoC doesn't have 436 a FPU, you should select this. 437 438config MATH_EMULATION_HW_UNIMPLEMENTED 439 bool "Just emulate the FPU unimplemented instructions" 440 help 441 Select this if you know there does have a hardware FPU on your 442 SoC, but some floating point instructions are not implemented by that. 443 444endchoice 445 446config PPC_TRANSACTIONAL_MEM 447 bool "Transactional Memory support for POWERPC" 448 depends on PPC_BOOK3S_64 449 depends on SMP 450 select ALTIVEC 451 select VSX 452 help 453 Support user-mode Transactional Memory on POWERPC. 454 455config LD_HEAD_STUB_CATCH 456 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT 457 depends on PPC64 458 help 459 Very large kernels can cause linker branch stubs to be generated by 460 code in head_64.S, which moves the head text sections out of their 461 specified location. This option can work around the problem. 462 463 If unsure, say "N". 464 465config MPROFILE_KERNEL 466 depends on PPC64 && CPU_LITTLE_ENDIAN 467 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__) 468 469config HOTPLUG_CPU 470 bool "Support for enabling/disabling CPUs" 471 depends on SMP && (PPC_PSERIES || \ 472 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE) 473 help 474 Say Y here to be able to disable and re-enable individual 475 CPUs at runtime on SMP machines. 476 477 Say N if you are unsure. 478 479config ARCH_CPU_PROBE_RELEASE 480 def_bool y 481 depends on HOTPLUG_CPU 482 483config ARCH_ENABLE_MEMORY_HOTPLUG 484 def_bool y 485 486config ARCH_ENABLE_MEMORY_HOTREMOVE 487 def_bool y 488 489config PPC64_SUPPORTS_MEMORY_FAILURE 490 bool "Add support for memory hwpoison" 491 depends on PPC_BOOK3S_64 492 default "y" if PPC_POWERNV 493 select ARCH_SUPPORTS_MEMORY_FAILURE 494 495config KEXEC 496 bool "kexec system call" 497 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E 498 select KEXEC_CORE 499 help 500 kexec is a system call that implements the ability to shutdown your 501 current kernel, and to start another kernel. It is like a reboot 502 but it is independent of the system firmware. And like a reboot 503 you can start any kernel with it, not just Linux. 504 505 The name comes from the similarity to the exec system call. 506 507 It is an ongoing process to be certain the hardware in a machine 508 is properly shutdown, so do not be surprised if this code does not 509 initially work for you. As of this writing the exact hardware 510 interface is strongly in flux, so no good recommendation can be 511 made. 512 513config KEXEC_FILE 514 bool "kexec file based system call" 515 select KEXEC_CORE 516 select HAVE_IMA_KEXEC 517 select BUILD_BIN2C 518 select KEXEC_ELF 519 depends on PPC64 520 depends on CRYPTO=y 521 depends on CRYPTO_SHA256=y 522 help 523 This is a new version of the kexec system call. This call is 524 file based and takes in file descriptors as system call arguments 525 for kernel and initramfs as opposed to a list of segments as is the 526 case for the older kexec call. 527 528config ARCH_HAS_KEXEC_PURGATORY 529 def_bool KEXEC_FILE 530 531config RELOCATABLE 532 bool "Build a relocatable kernel" 533 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE)) 534 select NONSTATIC_KERNEL 535 select MODULE_REL_CRCS if MODVERSIONS 536 help 537 This builds a kernel image that is capable of running at the 538 location the kernel is loaded at. For ppc32, there is no any 539 alignment restrictions, and this feature is a superset of 540 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use 541 16k-aligned base address. The kernel is linked as a 542 position-independent executable (PIE) and contains dynamic relocations 543 which are processed early in the bootup process. 544 545 One use is for the kexec on panic case where the recovery kernel 546 must live at a different physical address than the primary 547 kernel. 548 549 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address 550 it has been loaded at and the compile time physical addresses 551 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START 552 setting can still be useful to bootwrappers that need to know the 553 load address of the kernel (eg. u-boot/mkimage). 554 555config RANDOMIZE_BASE 556 bool "Randomize the address of the kernel image" 557 depends on (FSL_BOOKE && FLATMEM && PPC32) 558 depends on RELOCATABLE 559 help 560 Randomizes the virtual address at which the kernel image is 561 loaded, as a security feature that deters exploit attempts 562 relying on knowledge of the location of kernel internals. 563 564 If unsure, say Y. 565 566config RELOCATABLE_TEST 567 bool "Test relocatable kernel" 568 depends on (PPC64 && RELOCATABLE) 569 help 570 This runs the relocatable kernel at the address it was initially 571 loaded at, which tends to be non-zero and therefore test the 572 relocation code. 573 574config CRASH_DUMP 575 bool "Build a dump capture kernel" 576 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP) 577 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE 578 help 579 Build a kernel suitable for use as a dump capture kernel. 580 The same kernel binary can be used as production kernel and dump 581 capture kernel. 582 583config FA_DUMP 584 bool "Firmware-assisted dump" 585 depends on PPC64 && (PPC_RTAS || PPC_POWERNV) 586 select CRASH_CORE 587 select CRASH_DUMP 588 help 589 A robust mechanism to get reliable kernel crash dump with 590 assistance from firmware. This approach does not use kexec, 591 instead firmware assists in booting the capture kernel 592 while preserving memory contents. Firmware-assisted dump 593 is meant to be a kdump replacement offering robustness and 594 speed not possible without system firmware assistance. 595 596 If unsure, say "y". Only special kernels like petitboot may 597 need to say "N" here. 598 599config PRESERVE_FA_DUMP 600 bool "Preserve Firmware-assisted dump" 601 depends on PPC64 && PPC_POWERNV && !FA_DUMP 602 help 603 On a kernel with FA_DUMP disabled, this option helps to preserve 604 crash data from a previously crash'ed kernel. Useful when the next 605 memory preserving kernel boot would process this crash data. 606 Petitboot kernel is the typical usecase for this option. 607 608config OPAL_CORE 609 bool "Export OPAL memory as /sys/firmware/opal/core" 610 depends on PPC64 && PPC_POWERNV 611 help 612 This option uses the MPIPL support in firmware to provide an 613 ELF core of OPAL memory after a crash. The ELF core is exported 614 as /sys/firmware/opal/core file which is helpful in debugging 615 OPAL crashes using GDB. 616 617config IRQ_ALL_CPUS 618 bool "Distribute interrupts on all CPUs by default" 619 depends on SMP 620 help 621 This option gives the kernel permission to distribute IRQs across 622 multiple CPUs. Saying N here will route all IRQs to the first 623 CPU. Generally saying Y is safe, although some problems have been 624 reported with SMP Power Macintoshes with this option enabled. 625 626config NUMA 627 bool "NUMA support" 628 depends on PPC64 629 default y if SMP && PPC_PSERIES 630 631config NODES_SHIFT 632 int 633 default "8" if PPC64 634 default "4" 635 depends on NEED_MULTIPLE_NODES 636 637config USE_PERCPU_NUMA_NODE_ID 638 def_bool y 639 depends on NUMA 640 641config HAVE_MEMORYLESS_NODES 642 def_bool y 643 depends on NUMA 644 645config ARCH_SELECT_MEMORY_MODEL 646 def_bool y 647 depends on PPC64 648 649config ARCH_FLATMEM_ENABLE 650 def_bool y 651 depends on (PPC64 && !NUMA) || PPC32 652 653config ARCH_SPARSEMEM_ENABLE 654 def_bool y 655 depends on PPC64 656 select SPARSEMEM_VMEMMAP_ENABLE 657 658config ARCH_SPARSEMEM_DEFAULT 659 def_bool y 660 depends on PPC_BOOK3S_64 661 662config SYS_SUPPORTS_HUGETLBFS 663 bool 664 665config ILLEGAL_POINTER_VALUE 666 hex 667 # This is roughly half way between the top of user space and the bottom 668 # of kernel space, which seems about as good as we can get. 669 default 0x5deadbeef0000000 if PPC64 670 default 0 671 672config ARCH_MEMORY_PROBE 673 def_bool y 674 depends on MEMORY_HOTPLUG 675 676# Some NUMA nodes have memory ranges that span 677# other nodes. Even though a pfn is valid and 678# between a node's start and end pfns, it may not 679# reside on that node. See memmap_init_zone() 680# for details. 681config NODES_SPAN_OTHER_NODES 682 def_bool y 683 depends on NEED_MULTIPLE_NODES 684 685config STDBINUTILS 686 bool "Using standard binutils settings" 687 depends on 44x 688 default y 689 help 690 Turning this option off allows you to select 256KB PAGE_SIZE on 44x. 691 Note, that kernel will be able to run only those applications, 692 which had been compiled using binutils later than 2.17.50.0.3 with 693 '-zmax-page-size' set to 256K (the default is 64K). Or, if using 694 the older binutils, you can patch them with a trivial patch, which 695 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000. 696 697choice 698 prompt "Page size" 699 default PPC_4K_PAGES 700 help 701 Select the kernel logical page size. Increasing the page size 702 will reduce software overhead at each page boundary, allow 703 hardware prefetch mechanisms to be more effective, and allow 704 larger dma transfers increasing IO efficiency and reducing 705 overhead. However the utilization of memory will increase. 706 For example, each cached file will using a multiple of the 707 page size to hold its contents and the difference between the 708 end of file and the end of page is wasted. 709 710 Some dedicated systems, such as software raid serving with 711 accelerated calculations, have shown significant increases. 712 713 If you configure a 64 bit kernel for 64k pages but the 714 processor does not support them, then the kernel will simulate 715 them with 4k pages, loading them on demand, but with the 716 reduced software overhead and larger internal fragmentation. 717 For the 32 bit kernel, a large page option will not be offered 718 unless it is supported by the configured processor. 719 720 If unsure, choose 4K_PAGES. 721 722config PPC_4K_PAGES 723 bool "4k page size" 724 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 725 726config PPC_16K_PAGES 727 bool "16k page size" 728 depends on 44x || PPC_8xx 729 730config PPC_64K_PAGES 731 bool "64k page size" 732 depends on 44x || PPC_BOOK3S_64 733 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 734 735config PPC_256K_PAGES 736 bool "256k page size" 737 depends on 44x && !STDBINUTILS 738 help 739 Make the page size 256k. 740 741 As the ELF standard only requires alignment to support page 742 sizes up to 64k, you will need to compile all of your user 743 space applications with a non-standard binutils settings 744 (see the STDBINUTILS description for details). 745 746 Say N unless you know what you are doing. 747 748endchoice 749 750config PPC_PAGE_SHIFT 751 int 752 default 18 if PPC_256K_PAGES 753 default 16 if PPC_64K_PAGES 754 default 14 if PPC_16K_PAGES 755 default 12 756 757config THREAD_SHIFT 758 int "Thread shift" if EXPERT 759 range 13 15 760 default "15" if PPC_256K_PAGES 761 default "14" if PPC64 762 default "13" 763 help 764 Used to define the stack size. The default is almost always what you 765 want. Only change this if you know what you are doing. 766 767config ETEXT_SHIFT_BOOL 768 bool "Set custom etext alignment" if STRICT_KERNEL_RWX && \ 769 (PPC_BOOK3S_32 || PPC_8xx) 770 depends on ADVANCED_OPTIONS 771 help 772 This option allows you to set the kernel end of text alignment. When 773 RAM is mapped by blocks, the alignment needs to fit the size and 774 number of possible blocks. The default should be OK for most configs. 775 776 Say N here unless you know what you are doing. 777 778config ETEXT_SHIFT 779 int "_etext shift" if ETEXT_SHIFT_BOOL 780 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32 781 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx 782 default 17 if STRICT_KERNEL_RWX && PPC_BOOK3S_32 783 default 19 if STRICT_KERNEL_RWX && PPC_8xx 784 default PPC_PAGE_SHIFT 785 help 786 On Book3S 32 (603+), IBATs are used to map kernel text. 787 Smaller is the alignment, greater is the number of necessary IBATs. 788 789 On 8xx, large pages (512kb or 8M) are used to map kernel linear 790 memory. Aligning to 8M reduces TLB misses as only 8M pages are used 791 in that case. 792 793config DATA_SHIFT_BOOL 794 bool "Set custom data alignment" if STRICT_KERNEL_RWX && \ 795 (PPC_BOOK3S_32 || PPC_8xx) 796 depends on ADVANCED_OPTIONS 797 help 798 This option allows you to set the kernel data alignment. When 799 RAM is mapped by blocks, the alignment needs to fit the size and 800 number of possible blocks. The default should be OK for most configs. 801 802 Say N here unless you know what you are doing. 803 804config DATA_SHIFT 805 int "Data shift" if DATA_SHIFT_BOOL 806 default 24 if STRICT_KERNEL_RWX && PPC64 807 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32 808 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx 809 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32 810 default 23 if STRICT_KERNEL_RWX && PPC_8xx 811 default PPC_PAGE_SHIFT 812 help 813 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO. 814 Smaller is the alignment, greater is the number of necessary DBATs. 815 816 On 8xx, large pages (512kb or 8M) are used to map kernel linear 817 memory. Aligning to 8M reduces TLB misses as only 8M pages are used 818 in that case. 819 820config FORCE_MAX_ZONEORDER 821 int "Maximum zone order" 822 range 8 9 if PPC64 && PPC_64K_PAGES 823 default "9" if PPC64 && PPC_64K_PAGES 824 range 13 13 if PPC64 && !PPC_64K_PAGES 825 default "13" if PPC64 && !PPC_64K_PAGES 826 range 9 64 if PPC32 && PPC_16K_PAGES 827 default "9" if PPC32 && PPC_16K_PAGES 828 range 7 64 if PPC32 && PPC_64K_PAGES 829 default "7" if PPC32 && PPC_64K_PAGES 830 range 5 64 if PPC32 && PPC_256K_PAGES 831 default "5" if PPC32 && PPC_256K_PAGES 832 range 11 64 833 default "11" 834 help 835 The kernel memory allocator divides physically contiguous memory 836 blocks into "zones", where each zone is a power of two number of 837 pages. This option selects the largest power of two that the kernel 838 keeps in the memory allocator. If you need to allocate very large 839 blocks of physically contiguous memory, then you may need to 840 increase this value. 841 842 This config option is actually maximum order plus one. For example, 843 a value of 11 means that the largest free memory block is 2^10 pages. 844 845 The page size is not necessarily 4KB. For example, on 64-bit 846 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep 847 this in mind when choosing a value for this option. 848 849config PPC_SUBPAGE_PROT 850 bool "Support setting protections for 4k subpages" 851 depends on PPC_BOOK3S_64 && PPC_64K_PAGES 852 help 853 This option adds support for a system call to allow user programs 854 to set access permissions (read/write, readonly, or no access) 855 on the 4k subpages of each 64k page. 856 857config PPC_COPRO_BASE 858 bool 859 860config SCHED_SMT 861 bool "SMT (Hyperthreading) scheduler support" 862 depends on PPC64 && SMP 863 help 864 SMT scheduler support improves the CPU scheduler's decision making 865 when dealing with POWER5 cpus at a cost of slightly increased 866 overhead in some places. If unsure say N here. 867 868config PPC_DENORMALISATION 869 bool "PowerPC denormalisation exception handling" 870 depends on PPC_BOOK3S_64 871 default "y" if PPC_POWERNV 872 help 873 Add support for handling denormalisation of single precision 874 values. Useful for bare metal only. If unsure say Y here. 875 876config CMDLINE_BOOL 877 bool "Default bootloader kernel arguments" 878 879config CMDLINE 880 string "Initial kernel command string" if CMDLINE_BOOL 881 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" if CMDLINE_BOOL 882 default "" 883 help 884 On some platforms, there is currently no way for the boot loader to 885 pass arguments to the kernel. For these platforms, you can supply 886 some command-line options at build time by entering them here. In 887 most cases you will need to specify the root device here. 888 889choice 890 prompt "Kernel command line type" if CMDLINE != "" 891 default CMDLINE_FROM_BOOTLOADER 892 893config CMDLINE_FROM_BOOTLOADER 894 bool "Use bootloader kernel arguments if available" 895 help 896 Uses the command-line options passed by the boot loader. If 897 the boot loader doesn't provide any, the default kernel command 898 string provided in CMDLINE will be used. 899 900config CMDLINE_EXTEND 901 bool "Extend bootloader kernel arguments" 902 help 903 The command-line arguments provided by the boot loader will be 904 appended to the default kernel command string. 905 906config CMDLINE_FORCE 907 bool "Always use the default kernel command string" 908 help 909 Always use the default kernel command string, even if the boot 910 loader passes other arguments to the kernel. 911 This is useful if you cannot or don't want to change the 912 command-line options your boot loader passes to the kernel. 913 914endchoice 915 916config EXTRA_TARGETS 917 string "Additional default image types" 918 help 919 List additional targets to be built by the bootwrapper here (separated 920 by spaces). This is useful for targets that depend of device tree 921 files in the .dts directory. 922 923 Targets in this list will be build as part of the default build 924 target, or when the user does a 'make zImage' or a 925 'make zImage.initrd'. 926 927 If unsure, leave blank 928 929config ARCH_WANTS_FREEZER_CONTROL 930 def_bool y 931 depends on ADB_PMU 932 933source "kernel/power/Kconfig" 934 935config SECCOMP 936 bool "Enable seccomp to safely compute untrusted bytecode" 937 depends on PROC_FS 938 default y 939 help 940 This kernel feature is useful for number crunching applications 941 that may need to compute untrusted bytecode during their 942 execution. By using pipes or other transports made available to 943 the process as file descriptors supporting the read/write 944 syscalls, it's possible to isolate those applications in 945 their own address space using seccomp. Once seccomp is 946 enabled via /proc/<pid>/seccomp, it cannot be disabled 947 and the task is only allowed to execute a few safe syscalls 948 defined by each seccomp mode. 949 950 If unsure, say Y. Only embedded should say N here. 951 952config PPC_MEM_KEYS 953 prompt "PowerPC Memory Protection Keys" 954 def_bool y 955 depends on PPC_BOOK3S_64 956 select ARCH_USES_HIGH_VMA_FLAGS 957 select ARCH_HAS_PKEYS 958 help 959 Memory Protection Keys provides a mechanism for enforcing 960 page-based protections, but without requiring modification of the 961 page tables when an application changes protection domains. 962 963 For details, see Documentation/core-api/protection-keys.rst 964 965 If unsure, say y. 966 967config PPC_SECURE_BOOT 968 prompt "Enable secure boot support" 969 bool 970 depends on PPC_POWERNV 971 depends on IMA_ARCH_POLICY 972 help 973 Systems with firmware secure boot enabled need to define security 974 policies to extend secure boot to the OS. This config allows a user 975 to enable OS secure boot on systems that have firmware support for 976 it. If in doubt say N. 977 978config PPC_SECVAR_SYSFS 979 bool "Enable sysfs interface for POWER secure variables" 980 default y 981 depends on PPC_SECURE_BOOT 982 depends on SYSFS 983 help 984 POWER secure variables are managed and controlled by firmware. 985 These variables are exposed to userspace via sysfs to enable 986 read/write operations on these variables. Say Y if you have 987 secure boot enabled and want to expose variables to userspace. 988 989endmenu 990 991config ISA_DMA_API 992 bool 993 default PCI 994 995menu "Bus options" 996 997config ISA 998 bool "Support for ISA-bus hardware" 999 depends on PPC_CHRP 1000 select PPC_I8259 1001 help 1002 Find out whether you have ISA slots on your motherboard. ISA is the 1003 name of a bus system, i.e. the way the CPU talks to the other stuff 1004 inside your box. If you have an Apple machine, say N here; if you 1005 have an IBM RS/6000 or pSeries machine, say Y. If you have an 1006 embedded board, consult your board documentation. 1007 1008config GENERIC_ISA_DMA 1009 bool 1010 depends on ISA_DMA_API 1011 default y 1012 1013config PPC_INDIRECT_PCI 1014 bool 1015 depends on PCI 1016 default y if 40x || 44x 1017 1018config SBUS 1019 bool 1020 1021config FSL_SOC 1022 bool 1023 1024config FSL_PCI 1025 bool 1026 select ARCH_HAS_DMA_SET_MASK 1027 select PPC_INDIRECT_PCI 1028 select PCI_QUIRKS 1029 1030config FSL_PMC 1031 bool 1032 default y 1033 depends on SUSPEND && (PPC_85xx || PPC_86xx) 1034 help 1035 Freescale MPC85xx/MPC86xx power management controller support 1036 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c 1037 1038config PPC4xx_CPM 1039 bool 1040 default y 1041 depends on SUSPEND && (44x || 40x) 1042 help 1043 PPC4xx Clock Power Management (CPM) support (suspend/resume). 1044 It also enables support for two different idle states (idle-wait 1045 and idle-doze). 1046 1047config 4xx_SOC 1048 bool 1049 1050config FSL_LBC 1051 bool "Freescale Local Bus support" 1052 help 1053 Enables reporting of errors from the Freescale local bus 1054 controller. Also contains some common code used by 1055 drivers for specific local bus peripherals. 1056 1057config FSL_GTM 1058 bool 1059 depends on PPC_83xx || QUICC_ENGINE || CPM2 1060 help 1061 Freescale General-purpose Timers support 1062 1063config PCI_8260 1064 bool 1065 depends on PCI && 8260 1066 select PPC_INDIRECT_PCI 1067 default y 1068 1069config FSL_RIO 1070 bool "Freescale Embedded SRIO Controller support" 1071 depends on RAPIDIO = y && HAVE_RAPIDIO 1072 default "n" 1073 help 1074 Include support for RapidIO controller on Freescale embedded 1075 processors (MPC8548, MPC8641, etc). 1076 1077endmenu 1078 1079config NONSTATIC_KERNEL 1080 bool 1081 1082menu "Advanced setup" 1083 depends on PPC32 1084 1085config ADVANCED_OPTIONS 1086 bool "Prompt for advanced kernel configuration options" 1087 help 1088 This option will enable prompting for a variety of advanced kernel 1089 configuration options. These options can cause the kernel to not 1090 work if they are set incorrectly, but can be used to optimize certain 1091 aspects of kernel memory management. 1092 1093 Unless you know what you are doing, say N here. 1094 1095comment "Default settings for advanced configuration options are used" 1096 depends on !ADVANCED_OPTIONS 1097 1098config LOWMEM_SIZE_BOOL 1099 bool "Set maximum low memory" 1100 depends on ADVANCED_OPTIONS 1101 help 1102 This option allows you to set the maximum amount of memory which 1103 will be used as "low memory", that is, memory which the kernel can 1104 access directly, without having to set up a kernel virtual mapping. 1105 This can be useful in optimizing the layout of kernel virtual 1106 memory. 1107 1108 Say N here unless you know what you are doing. 1109 1110config LOWMEM_SIZE 1111 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL 1112 default "0x30000000" 1113 1114config LOWMEM_CAM_NUM_BOOL 1115 bool "Set number of CAMs to use to map low memory" 1116 depends on ADVANCED_OPTIONS && FSL_BOOKE 1117 help 1118 This option allows you to set the maximum number of CAM slots that 1119 will be used to map low memory. There are a limited number of slots 1120 available and even more limited number that will fit in the L1 MMU. 1121 However, using more entries will allow mapping more low memory. This 1122 can be useful in optimizing the layout of kernel virtual memory. 1123 1124 Say N here unless you know what you are doing. 1125 1126config LOWMEM_CAM_NUM 1127 depends on FSL_BOOKE 1128 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL 1129 default 3 1130 1131config DYNAMIC_MEMSTART 1132 bool "Enable page aligned dynamic load address for kernel" 1133 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x) 1134 select NONSTATIC_KERNEL 1135 help 1136 This option enables the kernel to be loaded at any page aligned 1137 physical address. The kernel creates a mapping from KERNELBASE to 1138 the address where the kernel is loaded. The page size here implies 1139 the TLB page size of the mapping for kernel on the particular platform. 1140 Please refer to the init code for finding the TLB page size. 1141 1142 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE 1143 kernel image, where the only restriction is the page aligned kernel 1144 load address. When this option is enabled, the compile time physical 1145 address CONFIG_PHYSICAL_START is ignored. 1146 1147 This option is overridden by CONFIG_RELOCATABLE 1148 1149config PAGE_OFFSET_BOOL 1150 bool "Set custom page offset address" 1151 depends on ADVANCED_OPTIONS 1152 help 1153 This option allows you to set the kernel virtual address at which 1154 the kernel will map low memory. This can be useful in optimizing 1155 the virtual memory layout of the system. 1156 1157 Say N here unless you know what you are doing. 1158 1159config PAGE_OFFSET 1160 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL 1161 default "0xc0000000" 1162 1163config KERNEL_START_BOOL 1164 bool "Set custom kernel base address" 1165 depends on ADVANCED_OPTIONS 1166 help 1167 This option allows you to set the kernel virtual address at which 1168 the kernel will be loaded. Normally this should match PAGE_OFFSET 1169 however there are times (like kdump) that one might not want them 1170 to be the same. 1171 1172 Say N here unless you know what you are doing. 1173 1174config KERNEL_START 1175 hex "Virtual address of kernel base" if KERNEL_START_BOOL 1176 default PAGE_OFFSET if PAGE_OFFSET_BOOL 1177 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL 1178 default "0xc0000000" 1179 1180config PHYSICAL_START_BOOL 1181 bool "Set physical address where the kernel is loaded" 1182 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE 1183 help 1184 This gives the physical address where the kernel is loaded. 1185 1186 Say N here unless you know what you are doing. 1187 1188config PHYSICAL_START 1189 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL 1190 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL 1191 default "0x00000000" 1192 1193config PHYSICAL_ALIGN 1194 hex 1195 default "0x04000000" if FSL_BOOKE 1196 help 1197 This value puts the alignment restrictions on physical address 1198 where kernel is loaded and run from. Kernel is compiled for an 1199 address which meets above alignment restriction. 1200 1201config TASK_SIZE_BOOL 1202 bool "Set custom user task size" 1203 depends on ADVANCED_OPTIONS 1204 help 1205 This option allows you to set the amount of virtual address space 1206 allocated to user tasks. This can be useful in optimizing the 1207 virtual memory layout of the system. 1208 1209 Say N here unless you know what you are doing. 1210 1211config TASK_SIZE 1212 hex "Size of user task space" if TASK_SIZE_BOOL 1213 default "0x80000000" if PPC_8xx 1214 default "0xc0000000" 1215 1216config PIN_TLB 1217 bool "Pinned Kernel TLBs (860 ONLY)" 1218 depends on ADVANCED_OPTIONS && PPC_8xx && \ 1219 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX 1220 1221config PIN_TLB_DATA 1222 bool "Pinned TLB for DATA" 1223 depends on PIN_TLB 1224 default y 1225 1226config PIN_TLB_IMMR 1227 bool "Pinned TLB for IMMR" 1228 depends on PIN_TLB || PPC_EARLY_DEBUG_CPM 1229 default y 1230 1231config PIN_TLB_TEXT 1232 bool "Pinned TLB for TEXT" 1233 depends on PIN_TLB 1234 default y 1235endmenu 1236 1237if PPC64 1238# This value must have zeroes in the bottom 60 bits otherwise lots will break 1239config PAGE_OFFSET 1240 hex 1241 default "0xc000000000000000" 1242config KERNEL_START 1243 hex 1244 default "0xc000000000000000" 1245config PHYSICAL_START 1246 hex 1247 default "0x00000000" 1248endif 1249 1250config ARCH_RANDOM 1251 def_bool n 1252 1253config PPC_LIB_RHEAP 1254 bool 1255 1256source "arch/powerpc/kvm/Kconfig" 1257 1258source "kernel/livepatch/Kconfig" 1259