1# SPDX-License-Identifier: GPL-2.0 2source "arch/powerpc/platforms/Kconfig.cputype" 3 4config CC_HAS_ELFV2 5 def_bool PPC64 && $(cc-option, -mabi=elfv2) 6 7config 32BIT 8 bool 9 default y if PPC32 10 11config 64BIT 12 bool 13 default y if PPC64 14 15config LIVEPATCH_64 16 def_bool PPC64 17 depends on LIVEPATCH 18 19config MMU 20 bool 21 default y 22 23config ARCH_MMAP_RND_BITS_MAX 24 # On Book3S 64, the default virtual address space for 64-bit processes 25 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to 26 # 32T of address space (2^45), which should ensure a reasonable gap 27 # between bottom-up and top-down allocations for applications that 28 # consume "normal" amounts of address space. Book3S 64 only supports 64K 29 # and 4K page sizes. 30 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K) 31 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K) 32 # 33 # On all other 64-bit platforms (currently only Book3E), the virtual 34 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T 35 # of address space (2^44). Only 4K page sizes are supported. 36 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K) 37 # 38 # For 32-bit, use the compat values, as they're the same. 39 default ARCH_MMAP_RND_COMPAT_BITS_MAX 40 41config ARCH_MMAP_RND_BITS_MIN 42 # Allow randomisation to consume up to 1GB of address space (2^30). 43 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K) 44 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K) 45 # 46 # For 32-bit, use the compat values, as they're the same. 47 default ARCH_MMAP_RND_COMPAT_BITS_MIN 48 49config ARCH_MMAP_RND_COMPAT_BITS_MAX 50 # Total virtual address space for 32-bit processes is 2^31 (2GB). 51 # Allow randomisation to consume up to 512MB of address space (2^29). 52 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K) 53 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K) 54 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K) 55 default 17 # 17 = 29 (512MB) - 12 (4K) 56 57config ARCH_MMAP_RND_COMPAT_BITS_MIN 58 # Total virtual address space for 32-bit processes is 2^31 (2GB). 59 # Allow randomisation to consume up to 8MB of address space (2^23). 60 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K) 61 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K) 62 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K) 63 default 11 # 11 = 23 (8MB) - 12 (4K) 64 65config NR_IRQS 66 int "Number of virtual interrupt numbers" 67 range 32 1048576 68 default "512" 69 help 70 This defines the number of virtual interrupt numbers the kernel 71 can manage. Virtual interrupt numbers are what you see in 72 /proc/interrupts. If you configure your system to have too few, 73 drivers will fail to load or worse - handle with care. 74 75config NMI_IPI 76 bool 77 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR) 78 default y 79 80config PPC_WATCHDOG 81 bool 82 depends on HARDLOCKUP_DETECTOR 83 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH 84 default y 85 help 86 This is a placeholder when the powerpc hardlockup detector 87 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is 88 selected via the generic lockup detector menu which is why we 89 have no standalone config option for it here. 90 91config STACKTRACE_SUPPORT 92 bool 93 default y 94 95config LOCKDEP_SUPPORT 96 bool 97 default y 98 99config GENERIC_LOCKBREAK 100 bool 101 default y 102 depends on SMP && PREEMPTION 103 104config GENERIC_HWEIGHT 105 bool 106 default y 107 108config PPC 109 bool 110 default y 111 # 112 # Please keep this list sorted alphabetically. 113 # 114 select ARCH_32BIT_OFF_T if PPC32 115 select ARCH_DISABLE_KASAN_INLINE if PPC_RADIX_MMU 116 select ARCH_ENABLE_MEMORY_HOTPLUG 117 select ARCH_ENABLE_MEMORY_HOTREMOVE 118 select ARCH_HAS_COPY_MC if PPC64 119 select ARCH_HAS_CURRENT_STACK_POINTER 120 select ARCH_HAS_DEBUG_VIRTUAL 121 select ARCH_HAS_DEBUG_VM_PGTABLE 122 select ARCH_HAS_DEBUG_WX if STRICT_KERNEL_RWX 123 select ARCH_HAS_DEVMEM_IS_ALLOWED 124 select ARCH_HAS_DMA_MAP_DIRECT if PPC_PSERIES 125 select ARCH_HAS_FORTIFY_SOURCE 126 select ARCH_HAS_GCOV_PROFILE_ALL 127 select ARCH_HAS_HUGEPD if HUGETLB_PAGE 128 select ARCH_HAS_KCOV 129 select ARCH_HAS_MEMBARRIER_CALLBACKS 130 select ARCH_HAS_MEMBARRIER_SYNC_CORE 131 select ARCH_HAS_MEMREMAP_COMPAT_ALIGN if PPC_64S_HASH_MMU 132 select ARCH_HAS_MMIOWB if PPC64 133 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE 134 select ARCH_HAS_PHYS_TO_DMA 135 select ARCH_HAS_PMEM_API 136 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64 137 select ARCH_HAS_PTE_SPECIAL 138 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64 139 select ARCH_HAS_SET_MEMORY 140 select ARCH_HAS_STRICT_KERNEL_RWX if (PPC_BOOK3S || PPC_8xx || 40x) && !HIBERNATION 141 select ARCH_HAS_STRICT_KERNEL_RWX if PPC_85xx && !HIBERNATION && !RANDOMIZE_BASE 142 select ARCH_HAS_STRICT_MODULE_RWX if ARCH_HAS_STRICT_KERNEL_RWX 143 select ARCH_HAS_SYSCALL_WRAPPER if !SPU_BASE && !COMPAT 144 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 145 select ARCH_HAS_UACCESS_FLUSHCACHE 146 select ARCH_HAS_UBSAN_SANITIZE_ALL 147 select ARCH_HAVE_NMI_SAFE_CMPXCHG 148 select ARCH_KEEP_MEMBLOCK 149 select ARCH_MIGHT_HAVE_PC_PARPORT 150 select ARCH_MIGHT_HAVE_PC_SERIO 151 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX 152 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT 153 select ARCH_SPLIT_ARG64 if PPC32 154 select ARCH_STACKWALK 155 select ARCH_SUPPORTS_ATOMIC_RMW 156 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC_BOOK3S || PPC_8xx || 40x 157 select ARCH_USE_BUILTIN_BSWAP 158 select ARCH_USE_CMPXCHG_LOCKREF if PPC64 159 select ARCH_USE_MEMTEST 160 select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS 161 select ARCH_USE_QUEUED_SPINLOCKS if PPC_QUEUED_SPINLOCKS 162 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT 163 select ARCH_WANT_IPC_PARSE_VERSION 164 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM 165 select ARCH_WANT_LD_ORPHAN_WARN 166 select ARCH_WANTS_MODULES_DATA_IN_VMALLOC if PPC_BOOK3S_32 || PPC_8xx 167 select ARCH_WANTS_NO_INSTR 168 select ARCH_WEAK_RELEASE_ACQUIRE 169 select BINFMT_ELF 170 select BUILDTIME_TABLE_SORT 171 select CLONE_BACKWARDS 172 select CPUMASK_OFFSTACK if NR_CPUS >= 8192 173 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN 174 select DMA_OPS_BYPASS if PPC64 175 select DMA_OPS if PPC64 176 select DYNAMIC_FTRACE if FUNCTION_TRACER 177 select EDAC_ATOMIC_SCRUB 178 select EDAC_SUPPORT 179 select GENERIC_ATOMIC64 if PPC32 180 select GENERIC_CLOCKEVENTS_BROADCAST if SMP 181 select GENERIC_CMOS_UPDATE 182 select GENERIC_CPU_AUTOPROBE 183 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC 184 select GENERIC_EARLY_IOREMAP 185 select GENERIC_GETTIMEOFDAY 186 select GENERIC_IRQ_SHOW 187 select GENERIC_IRQ_SHOW_LEVEL 188 select GENERIC_PCI_IOMAP if PCI 189 select GENERIC_PTDUMP 190 select GENERIC_SMP_IDLE_THREAD 191 select GENERIC_TIME_VSYSCALL 192 select GENERIC_VDSO_TIME_NS 193 select HAVE_ARCH_AUDITSYSCALL 194 select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP 195 select HAVE_ARCH_HUGE_VMAP if PPC_RADIX_MMU || PPC_8xx 196 select HAVE_ARCH_JUMP_LABEL 197 select HAVE_ARCH_JUMP_LABEL_RELATIVE 198 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14 199 select HAVE_ARCH_KASAN if PPC_RADIX_MMU 200 select HAVE_ARCH_KASAN if PPC_BOOK3E_64 201 select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN 202 select HAVE_ARCH_KFENCE if ARCH_SUPPORTS_DEBUG_PAGEALLOC 203 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET 204 select HAVE_ARCH_KGDB 205 select HAVE_ARCH_MMAP_RND_BITS 206 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT 207 select HAVE_ARCH_NVRAM_OPS 208 select HAVE_ARCH_SECCOMP_FILTER 209 select HAVE_ARCH_TRACEHOOK 210 select HAVE_ASM_MODVERSIONS 211 select HAVE_CONTEXT_TRACKING_USER if PPC64 212 select HAVE_C_RECORDMCOUNT 213 select HAVE_DEBUG_KMEMLEAK 214 select HAVE_DEBUG_STACKOVERFLOW 215 select HAVE_DYNAMIC_FTRACE 216 select HAVE_DYNAMIC_FTRACE_WITH_ARGS if MPROFILE_KERNEL || PPC32 217 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL || PPC32 218 select HAVE_EBPF_JIT 219 select HAVE_EFFICIENT_UNALIGNED_ACCESS 220 select HAVE_FAST_GUP 221 select HAVE_FTRACE_MCOUNT_RECORD 222 select HAVE_FUNCTION_DESCRIPTORS if PPC64_ELF_ABI_V1 223 select HAVE_FUNCTION_ERROR_INJECTION 224 select HAVE_FUNCTION_GRAPH_TRACER 225 select HAVE_FUNCTION_TRACER 226 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC 227 select HAVE_GENERIC_VDSO 228 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC_BOOK3S_64 && SMP 229 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH 230 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx) 231 select HAVE_IOREMAP_PROT 232 select HAVE_IRQ_TIME_ACCOUNTING 233 select HAVE_KERNEL_GZIP 234 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE 235 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE 236 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x 237 select HAVE_KPROBES 238 select HAVE_KPROBES_ON_FTRACE 239 select HAVE_KRETPROBES 240 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION 241 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS 242 select HAVE_MOD_ARCH_SPECIFIC 243 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S) 244 select HAVE_OPTPROBES 245 select HAVE_PERF_EVENTS 246 select HAVE_PERF_EVENTS_NMI if PPC64 247 select HAVE_PERF_REGS 248 select HAVE_PERF_USER_STACK_DUMP 249 select HAVE_REGS_AND_STACK_ACCESS_API 250 select HAVE_RELIABLE_STACKTRACE 251 select HAVE_RSEQ 252 select HAVE_SETUP_PER_CPU_AREA if PPC64 253 select HAVE_SOFTIRQ_ON_OWN_STACK 254 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2) 255 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13) 256 select HAVE_STATIC_CALL if PPC32 257 select HAVE_SYSCALL_TRACEPOINTS 258 select HAVE_VIRT_CPU_ACCOUNTING 259 select HUGETLB_PAGE_SIZE_VARIABLE if PPC_BOOK3S_64 && HUGETLB_PAGE 260 select IOMMU_HELPER if PPC64 261 select IRQ_DOMAIN 262 select IRQ_FORCED_THREADING 263 select KASAN_VMALLOC if KASAN && MODULES 264 select MMU_GATHER_PAGE_SIZE 265 select MMU_GATHER_RCU_TABLE_FREE 266 select MMU_GATHER_MERGE_VMAS 267 select MODULES_USE_ELF_RELA 268 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE 269 select NEED_PER_CPU_EMBED_FIRST_CHUNK if PPC64 270 select NEED_PER_CPU_PAGE_FIRST_CHUNK if PPC64 271 select NEED_SG_DMA_LENGTH 272 select OF 273 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE 274 select OF_EARLY_FLATTREE 275 select OLD_SIGACTION if PPC32 276 select OLD_SIGSUSPEND 277 select PCI_DOMAINS if PCI 278 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI 279 select PCI_SYSCALL if PCI 280 select PPC_DAWR if PPC64 281 select RTC_LIB 282 select SPARSE_IRQ 283 select STRICT_KERNEL_RWX if STRICT_MODULE_RWX 284 select SYSCTL_EXCEPTION_TRACE 285 select THREAD_INFO_IN_TASK 286 select TRACE_IRQFLAGS_SUPPORT 287 # 288 # Please keep this list sorted alphabetically. 289 # 290 291config PPC_LONG_DOUBLE_128 292 depends on PPC64 && ALTIVEC 293 def_bool $(success,test "$(shell,echo __LONG_DOUBLE_128__ | $(CC) -E -P -)" = 1) 294 295config PPC_BARRIER_NOSPEC 296 bool 297 default y 298 depends on PPC_BOOK3S_64 || PPC_E500 299 300config PPC_HAS_LBARX_LHARX 301 bool 302 303config EARLY_PRINTK 304 bool 305 default y 306 307config PANIC_TIMEOUT 308 int 309 default 180 310 311config COMPAT 312 bool "Enable support for 32bit binaries" 313 depends on PPC64 314 depends on !CC_IS_CLANG || CLANG_VERSION >= 120000 315 default y if !CPU_LITTLE_ENDIAN 316 select ARCH_WANT_OLD_COMPAT_IPC 317 select COMPAT_OLD_SIGACTION 318 319config SCHED_OMIT_FRAME_POINTER 320 bool 321 default y 322 323config ARCH_MAY_HAVE_PC_FDC 324 bool 325 default PCI 326 327config PPC_UDBG_16550 328 bool 329 330config GENERIC_TBSYNC 331 bool 332 default y if PPC32 && SMP 333 334config AUDIT_ARCH 335 bool 336 default y 337 338config GENERIC_BUG 339 bool 340 default y 341 depends on BUG 342 343config GENERIC_BUG_RELATIVE_POINTERS 344 def_bool y 345 depends on GENERIC_BUG 346 347config SYS_SUPPORTS_APM_EMULATION 348 default y if PMAC_APM_EMU 349 bool 350 351config EPAPR_BOOT 352 bool 353 help 354 Used to allow a board to specify it wants an ePAPR compliant wrapper. 355 356config DEFAULT_UIMAGE 357 bool 358 help 359 Used to allow a board to specify it wants a uImage built by default 360 361config ARCH_HIBERNATION_POSSIBLE 362 bool 363 default y 364 365config ARCH_SUSPEND_POSSIBLE 366 def_bool y 367 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \ 368 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \ 369 || 44x || 40x 370 371config ARCH_SUSPEND_NONZERO_CPU 372 def_bool y 373 depends on PPC_POWERNV || PPC_PSERIES 374 375config ARCH_HAS_ADD_PAGES 376 def_bool y 377 depends on ARCH_ENABLE_MEMORY_HOTPLUG 378 379config PPC_DCR_NATIVE 380 bool 381 382config PPC_DCR_MMIO 383 bool 384 385config PPC_DCR 386 bool 387 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO 388 default y 389 390config PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT 391 depends on PPC32 392 depends on !PPC_PMAC && !PPC_CHRP 393 bool "Assign PCI bus numbers from zero individually for each PCI domain" 394 help 395 By default on PPC32 were PCI bus numbers unique across all PCI domains. 396 So system could have only 256 PCI buses independently of available 397 PCI domains. When this option is enabled then PCI bus numbers are 398 PCI domain dependent and each PCI controller on own domain can have 399 256 PCI buses, like it is on other Linux architectures. 400 401config PPC_OF_PLATFORM_PCI 402 bool 403 depends on PCI 404 depends on PPC64 # not supported on 32 bits yet 405 406config ARCH_SUPPORTS_UPROBES 407 def_bool y 408 409config PPC_ADV_DEBUG_REGS 410 bool 411 depends on 40x || BOOKE 412 default y 413 414config PPC_ADV_DEBUG_IACS 415 int 416 depends on PPC_ADV_DEBUG_REGS 417 default 4 if 44x 418 default 2 419 420config PPC_ADV_DEBUG_DACS 421 int 422 depends on PPC_ADV_DEBUG_REGS 423 default 2 424 425config PPC_ADV_DEBUG_DVCS 426 int 427 depends on PPC_ADV_DEBUG_REGS 428 default 2 if 44x 429 default 0 430 431config PPC_ADV_DEBUG_DAC_RANGE 432 bool 433 depends on PPC_ADV_DEBUG_REGS && 44x 434 default y 435 436config PPC_DAWR 437 bool 438 439config PGTABLE_LEVELS 440 int 441 default 2 if !PPC64 442 default 4 443 444source "arch/powerpc/sysdev/Kconfig" 445source "arch/powerpc/platforms/Kconfig" 446 447menu "Kernel options" 448 449config HIGHMEM 450 bool "High memory support" 451 depends on PPC32 452 select KMAP_LOCAL 453 454source "kernel/Kconfig.hz" 455 456config MATH_EMULATION 457 bool "Math emulation" 458 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT 459 select PPC_FPU_REGS 460 help 461 Some PowerPC chips designed for embedded applications do not have 462 a floating-point unit and therefore do not implement the 463 floating-point instructions in the PowerPC instruction set. If you 464 say Y here, the kernel will include code to emulate a floating-point 465 unit, which will allow programs that use floating-point 466 instructions to run. 467 468 This is also useful to emulate missing (optional) instructions 469 such as fsqrt on cores that do have an FPU but do not implement 470 them (such as Freescale BookE). 471 472choice 473 prompt "Math emulation options" 474 default MATH_EMULATION_FULL 475 depends on MATH_EMULATION 476 477config MATH_EMULATION_FULL 478 bool "Emulate all the floating point instructions" 479 help 480 Select this option will enable the kernel to support to emulate 481 all the floating point instructions. If your SoC doesn't have 482 a FPU, you should select this. 483 484config MATH_EMULATION_HW_UNIMPLEMENTED 485 bool "Just emulate the FPU unimplemented instructions" 486 help 487 Select this if you know there does have a hardware FPU on your 488 SoC, but some floating point instructions are not implemented by that. 489 490endchoice 491 492config PPC_TRANSACTIONAL_MEM 493 bool "Transactional Memory support for POWERPC" 494 depends on PPC_BOOK3S_64 495 depends on SMP 496 select ALTIVEC 497 select VSX 498 help 499 Support user-mode Transactional Memory on POWERPC. 500 501config PPC_UV 502 bool "Ultravisor support" 503 depends on KVM_BOOK3S_HV_POSSIBLE 504 depends on DEVICE_PRIVATE 505 default n 506 help 507 This option paravirtualizes the kernel to run in POWER platforms that 508 supports the Protected Execution Facility (PEF). On such platforms, 509 the ultravisor firmware runs at a privilege level above the 510 hypervisor. 511 512 If unsure, say "N". 513 514config LD_HEAD_STUB_CATCH 515 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT 516 depends on PPC64 517 help 518 Very large kernels can cause linker branch stubs to be generated by 519 code in head_64.S, which moves the head text sections out of their 520 specified location. This option can work around the problem. 521 522 If unsure, say "N". 523 524config MPROFILE_KERNEL 525 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER 526 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__) 527 528config HOTPLUG_CPU 529 bool "Support for enabling/disabling CPUs" 530 depends on SMP && (PPC_PSERIES || \ 531 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE) 532 help 533 Say Y here to be able to disable and re-enable individual 534 CPUs at runtime on SMP machines. 535 536 Say N if you are unsure. 537 538config PPC_QUEUED_SPINLOCKS 539 bool "Queued spinlocks" if EXPERT 540 depends on SMP 541 default PPC_BOOK3S_64 542 help 543 Say Y here to use queued spinlocks which give better scalability and 544 fairness on large SMP and NUMA systems without harming single threaded 545 performance. 546 547config ARCH_CPU_PROBE_RELEASE 548 def_bool y 549 depends on HOTPLUG_CPU 550 551config PPC64_SUPPORTS_MEMORY_FAILURE 552 bool "Add support for memory hwpoison" 553 depends on PPC_BOOK3S_64 554 default "y" if PPC_POWERNV 555 select ARCH_SUPPORTS_MEMORY_FAILURE 556 557config KEXEC 558 bool "kexec system call" 559 depends on PPC_BOOK3S || PPC_E500 || (44x && !SMP) 560 select KEXEC_CORE 561 help 562 kexec is a system call that implements the ability to shutdown your 563 current kernel, and to start another kernel. It is like a reboot 564 but it is independent of the system firmware. And like a reboot 565 you can start any kernel with it, not just Linux. 566 567 The name comes from the similarity to the exec system call. 568 569 It is an ongoing process to be certain the hardware in a machine 570 is properly shutdown, so do not be surprised if this code does not 571 initially work for you. As of this writing the exact hardware 572 interface is strongly in flux, so no good recommendation can be 573 made. 574 575config KEXEC_FILE 576 bool "kexec file based system call" 577 select KEXEC_CORE 578 select HAVE_IMA_KEXEC if IMA 579 select KEXEC_ELF 580 depends on PPC64 581 depends on CRYPTO=y 582 depends on CRYPTO_SHA256=y 583 help 584 This is a new version of the kexec system call. This call is 585 file based and takes in file descriptors as system call arguments 586 for kernel and initramfs as opposed to a list of segments as is the 587 case for the older kexec call. 588 589config ARCH_HAS_KEXEC_PURGATORY 590 def_bool KEXEC_FILE 591 592config PPC64_BIG_ENDIAN_ELF_ABI_V2 593 bool "Build big-endian kernel using ELF ABI V2 (EXPERIMENTAL)" 594 depends on PPC64 && CPU_BIG_ENDIAN 595 depends on CC_HAS_ELFV2 596 depends on LD_IS_BFD && LD_VERSION >= 22400 597 default n 598 help 599 This builds the kernel image using the "Power Architecture 64-Bit ELF 600 V2 ABI Specification", which has a reduced stack overhead and faster 601 function calls. This internal kernel ABI option does not affect 602 userspace compatibility. 603 604 The V2 ABI is standard for 64-bit little-endian, but for big-endian 605 it is less well tested by kernel and toolchain. However some distros 606 build userspace this way, and it can produce a functioning kernel. 607 608 This requires GCC and binutils 2.24 or newer. 609 610config RELOCATABLE 611 bool "Build a relocatable kernel" 612 depends on PPC64 || (FLATMEM && (44x || PPC_85xx)) 613 select NONSTATIC_KERNEL 614 help 615 This builds a kernel image that is capable of running at the 616 location the kernel is loaded at. For ppc32, there is no any 617 alignment restrictions, and this feature is a superset of 618 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use 619 16k-aligned base address. The kernel is linked as a 620 position-independent executable (PIE) and contains dynamic relocations 621 which are processed early in the bootup process. 622 623 One use is for the kexec on panic case where the recovery kernel 624 must live at a different physical address than the primary 625 kernel. 626 627 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address 628 it has been loaded at and the compile time physical addresses 629 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START 630 setting can still be useful to bootwrappers that need to know the 631 load address of the kernel (eg. u-boot/mkimage). 632 633config RANDOMIZE_BASE 634 bool "Randomize the address of the kernel image" 635 depends on PPC_85xx && FLATMEM 636 depends on RELOCATABLE 637 help 638 Randomizes the virtual address at which the kernel image is 639 loaded, as a security feature that deters exploit attempts 640 relying on knowledge of the location of kernel internals. 641 642 If unsure, say Y. 643 644config RELOCATABLE_TEST 645 bool "Test relocatable kernel" 646 depends on (PPC64 && RELOCATABLE) 647 help 648 This runs the relocatable kernel at the address it was initially 649 loaded at, which tends to be non-zero and therefore test the 650 relocation code. 651 652config CRASH_DUMP 653 bool "Build a dump capture kernel" 654 depends on PPC64 || PPC_BOOK3S_32 || PPC_85xx || (44x && !SMP) 655 select RELOCATABLE if PPC64 || 44x || PPC_85xx 656 help 657 Build a kernel suitable for use as a dump capture kernel. 658 The same kernel binary can be used as production kernel and dump 659 capture kernel. 660 661config FA_DUMP 662 bool "Firmware-assisted dump" 663 depends on PPC64 && (PPC_RTAS || PPC_POWERNV) 664 select CRASH_CORE 665 select CRASH_DUMP 666 help 667 A robust mechanism to get reliable kernel crash dump with 668 assistance from firmware. This approach does not use kexec, 669 instead firmware assists in booting the capture kernel 670 while preserving memory contents. Firmware-assisted dump 671 is meant to be a kdump replacement offering robustness and 672 speed not possible without system firmware assistance. 673 674 If unsure, say "y". Only special kernels like petitboot may 675 need to say "N" here. 676 677config PRESERVE_FA_DUMP 678 bool "Preserve Firmware-assisted dump" 679 depends on PPC64 && PPC_POWERNV && !FA_DUMP 680 help 681 On a kernel with FA_DUMP disabled, this option helps to preserve 682 crash data from a previously crash'ed kernel. Useful when the next 683 memory preserving kernel boot would process this crash data. 684 Petitboot kernel is the typical usecase for this option. 685 686config OPAL_CORE 687 bool "Export OPAL memory as /sys/firmware/opal/core" 688 depends on PPC64 && PPC_POWERNV 689 help 690 This option uses the MPIPL support in firmware to provide an 691 ELF core of OPAL memory after a crash. The ELF core is exported 692 as /sys/firmware/opal/core file which is helpful in debugging 693 OPAL crashes using GDB. 694 695config IRQ_ALL_CPUS 696 bool "Distribute interrupts on all CPUs by default" 697 depends on SMP 698 help 699 This option gives the kernel permission to distribute IRQs across 700 multiple CPUs. Saying N here will route all IRQs to the first 701 CPU. Generally saying Y is safe, although some problems have been 702 reported with SMP Power Macintoshes with this option enabled. 703 704config NUMA 705 bool "NUMA Memory Allocation and Scheduler Support" 706 depends on PPC64 && SMP 707 default y if PPC_PSERIES || PPC_POWERNV 708 select USE_PERCPU_NUMA_NODE_ID 709 help 710 Enable NUMA (Non-Uniform Memory Access) support. 711 712 The kernel will try to allocate memory used by a CPU on the 713 local memory controller of the CPU and add some more 714 NUMA awareness to the kernel. 715 716config NODES_SHIFT 717 int 718 default "8" if PPC64 719 default "4" 720 depends on NUMA 721 722config HAVE_MEMORYLESS_NODES 723 def_bool y 724 depends on NUMA 725 726config ARCH_SELECT_MEMORY_MODEL 727 def_bool y 728 depends on PPC64 729 730config ARCH_FLATMEM_ENABLE 731 def_bool y 732 depends on (PPC64 && !NUMA) || PPC32 733 734config ARCH_SPARSEMEM_ENABLE 735 def_bool y 736 depends on PPC64 737 select SPARSEMEM_VMEMMAP_ENABLE 738 739config ARCH_SPARSEMEM_DEFAULT 740 def_bool y 741 depends on PPC_BOOK3S_64 742 743config ILLEGAL_POINTER_VALUE 744 hex 745 # This is roughly half way between the top of user space and the bottom 746 # of kernel space, which seems about as good as we can get. 747 default 0x5deadbeef0000000 if PPC64 748 default 0 749 750config ARCH_MEMORY_PROBE 751 def_bool y 752 depends on MEMORY_HOTPLUG 753 754choice 755 prompt "Page size" 756 default PPC_64K_PAGES if PPC_BOOK3S_64 757 default PPC_4K_PAGES 758 help 759 Select the kernel logical page size. Increasing the page size 760 will reduce software overhead at each page boundary, allow 761 hardware prefetch mechanisms to be more effective, and allow 762 larger dma transfers increasing IO efficiency and reducing 763 overhead. However the utilization of memory will increase. 764 For example, each cached file will using a multiple of the 765 page size to hold its contents and the difference between the 766 end of file and the end of page is wasted. 767 768 Some dedicated systems, such as software raid serving with 769 accelerated calculations, have shown significant increases. 770 771 If you configure a 64 bit kernel for 64k pages but the 772 processor does not support them, then the kernel will simulate 773 them with 4k pages, loading them on demand, but with the 774 reduced software overhead and larger internal fragmentation. 775 For the 32 bit kernel, a large page option will not be offered 776 unless it is supported by the configured processor. 777 778 If unsure, choose 4K_PAGES. 779 780config PPC_4K_PAGES 781 bool "4k page size" 782 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 783 784config PPC_16K_PAGES 785 bool "16k page size" 786 depends on 44x || PPC_8xx 787 788config PPC_64K_PAGES 789 bool "64k page size" 790 depends on 44x || PPC_BOOK3S_64 791 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 792 793config PPC_256K_PAGES 794 bool "256k page size (Requires non-standard binutils settings)" 795 depends on 44x && !PPC_47x 796 help 797 Make the page size 256k. 798 799 The kernel will only be able to run applications that have been 800 compiled with '-zmax-page-size' set to 256K (the default is 64K) using 801 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE 802 definition from 0x10000 to 0x40000 in older versions. 803 804endchoice 805 806config PAGE_SIZE_4KB 807 def_bool y 808 depends on PPC_4K_PAGES 809 810config PAGE_SIZE_16KB 811 def_bool y 812 depends on PPC_16K_PAGES 813 814config PAGE_SIZE_64KB 815 def_bool y 816 depends on PPC_64K_PAGES 817 818config PAGE_SIZE_256KB 819 def_bool y 820 depends on PPC_256K_PAGES 821 822config PPC_PAGE_SHIFT 823 int 824 default 18 if PPC_256K_PAGES 825 default 16 if PPC_64K_PAGES 826 default 14 if PPC_16K_PAGES 827 default 12 828 829config THREAD_SHIFT 830 int "Thread shift" if EXPERT 831 range 13 15 832 default "15" if PPC_256K_PAGES 833 default "14" if PPC64 834 default "13" 835 help 836 Used to define the stack size. The default is almost always what you 837 want. Only change this if you know what you are doing. 838 839config DATA_SHIFT_BOOL 840 bool "Set custom data alignment" 841 depends on ADVANCED_OPTIONS 842 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE 843 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX) || \ 844 PPC_85xx 845 help 846 This option allows you to set the kernel data alignment. When 847 RAM is mapped by blocks, the alignment needs to fit the size and 848 number of possible blocks. The default should be OK for most configs. 849 850 Say N here unless you know what you are doing. 851 852config DATA_SHIFT 853 int "Data shift" if DATA_SHIFT_BOOL 854 default 24 if STRICT_KERNEL_RWX && PPC64 855 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32 856 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx 857 range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_85xx 858 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32 859 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32 860 default 23 if STRICT_KERNEL_RWX && PPC_8xx 861 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA 862 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx 863 default 24 if STRICT_KERNEL_RWX && PPC_85xx 864 default PPC_PAGE_SHIFT 865 help 866 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO. 867 Smaller is the alignment, greater is the number of necessary DBATs. 868 869 On 8xx, large pages (512kb or 8M) are used to map kernel linear 870 memory. Aligning to 8M reduces TLB misses as only 8M pages are used 871 in that case. If PIN_TLB is selected, it must be aligned to 8M as 872 8M pages will be pinned. 873 874config ARCH_FORCE_MAX_ORDER 875 int "Maximum zone order" 876 range 8 9 if PPC64 && PPC_64K_PAGES 877 default "9" if PPC64 && PPC_64K_PAGES 878 range 13 13 if PPC64 && !PPC_64K_PAGES 879 default "13" if PPC64 && !PPC_64K_PAGES 880 range 9 64 if PPC32 && PPC_16K_PAGES 881 default "9" if PPC32 && PPC_16K_PAGES 882 range 7 64 if PPC32 && PPC_64K_PAGES 883 default "7" if PPC32 && PPC_64K_PAGES 884 range 5 64 if PPC32 && PPC_256K_PAGES 885 default "5" if PPC32 && PPC_256K_PAGES 886 range 11 64 887 default "11" 888 help 889 The kernel memory allocator divides physically contiguous memory 890 blocks into "zones", where each zone is a power of two number of 891 pages. This option selects the largest power of two that the kernel 892 keeps in the memory allocator. If you need to allocate very large 893 blocks of physically contiguous memory, then you may need to 894 increase this value. 895 896 This config option is actually maximum order plus one. For example, 897 a value of 11 means that the largest free memory block is 2^10 pages. 898 899 The page size is not necessarily 4KB. For example, on 64-bit 900 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep 901 this in mind when choosing a value for this option. 902 903config PPC_SUBPAGE_PROT 904 bool "Support setting protections for 4k subpages (subpage_prot syscall)" 905 default n 906 depends on PPC_64S_HASH_MMU && PPC_64K_PAGES 907 help 908 This option adds support for system call to allow user programs 909 to set access permissions (read/write, readonly, or no access) 910 on the 4k subpages of each 64k page. 911 912 If unsure, say N here. 913 914config PPC_PROT_SAO_LPAR 915 bool "Support PROT_SAO mappings in LPARs" 916 depends on PPC_BOOK3S_64 917 help 918 This option adds support for PROT_SAO mappings from userspace 919 inside LPARs on supported CPUs. 920 921 This may cause issues when performing guest migration from 922 a CPU that supports SAO to one that does not. 923 924 If unsure, say N here. 925 926config PPC_COPRO_BASE 927 bool 928 929config SCHED_SMT 930 bool "SMT (Hyperthreading) scheduler support" 931 depends on PPC64 && SMP 932 help 933 SMT scheduler support improves the CPU scheduler's decision making 934 when dealing with POWER5 cpus at a cost of slightly increased 935 overhead in some places. If unsure say N here. 936 937config PPC_DENORMALISATION 938 bool "PowerPC denormalisation exception handling" 939 depends on PPC_BOOK3S_64 940 default "y" if PPC_POWERNV 941 help 942 Add support for handling denormalisation of single precision 943 values. Useful for bare metal only. If unsure say Y here. 944 945config CMDLINE 946 string "Initial kernel command string" 947 default "" 948 help 949 On some platforms, there is currently no way for the boot loader to 950 pass arguments to the kernel. For these platforms, you can supply 951 some command-line options at build time by entering them here. In 952 most cases you will need to specify the root device here. 953 954choice 955 prompt "Kernel command line type" if CMDLINE != "" 956 default CMDLINE_FROM_BOOTLOADER 957 958config CMDLINE_FROM_BOOTLOADER 959 bool "Use bootloader kernel arguments if available" 960 help 961 Uses the command-line options passed by the boot loader. If 962 the boot loader doesn't provide any, the default kernel command 963 string provided in CMDLINE will be used. 964 965config CMDLINE_EXTEND 966 bool "Extend bootloader kernel arguments" 967 help 968 The command-line arguments provided by the boot loader will be 969 appended to the default kernel command string. 970 971config CMDLINE_FORCE 972 bool "Always use the default kernel command string" 973 help 974 Always use the default kernel command string, even if the boot 975 loader passes other arguments to the kernel. 976 This is useful if you cannot or don't want to change the 977 command-line options your boot loader passes to the kernel. 978 979endchoice 980 981config EXTRA_TARGETS 982 string "Additional default image types" 983 help 984 List additional targets to be built by the bootwrapper here (separated 985 by spaces). This is useful for targets that depend of device tree 986 files in the .dts directory. 987 988 Targets in this list will be build as part of the default build 989 target, or when the user does a 'make zImage' or a 990 'make zImage.initrd'. 991 992 If unsure, leave blank 993 994config ARCH_WANTS_FREEZER_CONTROL 995 def_bool y 996 depends on ADB_PMU 997 998source "kernel/power/Kconfig" 999 1000config PPC_MEM_KEYS 1001 prompt "PowerPC Memory Protection Keys" 1002 def_bool y 1003 depends on PPC_BOOK3S_64 1004 depends on PPC_64S_HASH_MMU 1005 select ARCH_USES_HIGH_VMA_FLAGS 1006 select ARCH_HAS_PKEYS 1007 help 1008 Memory Protection Keys provides a mechanism for enforcing 1009 page-based protections, but without requiring modification of the 1010 page tables when an application changes protection domains. 1011 1012 For details, see Documentation/core-api/protection-keys.rst 1013 1014 If unsure, say y. 1015 1016config PPC_SECURE_BOOT 1017 prompt "Enable secure boot support" 1018 bool 1019 depends on PPC_POWERNV || PPC_PSERIES 1020 depends on IMA_ARCH_POLICY 1021 imply IMA_SECURE_AND_OR_TRUSTED_BOOT 1022 help 1023 Systems with firmware secure boot enabled need to define security 1024 policies to extend secure boot to the OS. This config allows a user 1025 to enable OS secure boot on systems that have firmware support for 1026 it. If in doubt say N. 1027 1028config PPC_SECVAR_SYSFS 1029 bool "Enable sysfs interface for POWER secure variables" 1030 default y 1031 depends on PPC_SECURE_BOOT 1032 depends on SYSFS 1033 help 1034 POWER secure variables are managed and controlled by firmware. 1035 These variables are exposed to userspace via sysfs to enable 1036 read/write operations on these variables. Say Y if you have 1037 secure boot enabled and want to expose variables to userspace. 1038 1039config PPC_RTAS_FILTER 1040 bool "Enable filtering of RTAS syscalls" 1041 default y 1042 depends on PPC_RTAS 1043 help 1044 The RTAS syscall API has security issues that could be used to 1045 compromise system integrity. This option enforces restrictions on the 1046 RTAS calls and arguments passed by userspace programs to mitigate 1047 these issues. 1048 1049 Say Y unless you know what you are doing and the filter is causing 1050 problems for you. 1051 1052endmenu 1053 1054config ISA_DMA_API 1055 bool 1056 default PCI 1057 1058menu "Bus options" 1059 1060config ISA 1061 bool "Support for ISA-bus hardware" 1062 depends on PPC_CHRP 1063 select PPC_I8259 1064 help 1065 Find out whether you have ISA slots on your motherboard. ISA is the 1066 name of a bus system, i.e. the way the CPU talks to the other stuff 1067 inside your box. If you have an Apple machine, say N here; if you 1068 have an IBM RS/6000 or pSeries machine, say Y. If you have an 1069 embedded board, consult your board documentation. 1070 1071config GENERIC_ISA_DMA 1072 bool 1073 depends on ISA_DMA_API 1074 default y 1075 1076config PPC_INDIRECT_PCI 1077 bool 1078 depends on PCI 1079 default y if 40x || 44x 1080 1081config SBUS 1082 bool 1083 1084config FSL_SOC 1085 bool 1086 1087config FSL_PCI 1088 bool 1089 select ARCH_HAS_DMA_SET_MASK 1090 select PPC_INDIRECT_PCI 1091 select PCI_QUIRKS 1092 1093config FSL_PMC 1094 bool 1095 default y 1096 depends on SUSPEND && (PPC_85xx || PPC_86xx) 1097 help 1098 Freescale MPC85xx/MPC86xx power management controller support 1099 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c 1100 1101config PPC4xx_CPM 1102 bool 1103 default y 1104 depends on SUSPEND && (44x || 40x) 1105 help 1106 PPC4xx Clock Power Management (CPM) support (suspend/resume). 1107 It also enables support for two different idle states (idle-wait 1108 and idle-doze). 1109 1110config 4xx_SOC 1111 bool 1112 1113config FSL_LBC 1114 bool "Freescale Local Bus support" 1115 help 1116 Enables reporting of errors from the Freescale local bus 1117 controller. Also contains some common code used by 1118 drivers for specific local bus peripherals. 1119 1120config FSL_GTM 1121 bool 1122 depends on PPC_83xx || QUICC_ENGINE || CPM2 1123 help 1124 Freescale General-purpose Timers support 1125 1126config PCI_8260 1127 bool 1128 depends on PCI && 8260 1129 select PPC_INDIRECT_PCI 1130 default y 1131 1132config FSL_RIO 1133 bool "Freescale Embedded SRIO Controller support" 1134 depends on RAPIDIO = y && HAVE_RAPIDIO 1135 default "n" 1136 help 1137 Include support for RapidIO controller on Freescale embedded 1138 processors (MPC8548, MPC8641, etc). 1139 1140endmenu 1141 1142config NONSTATIC_KERNEL 1143 bool 1144 1145menu "Advanced setup" 1146 depends on PPC32 1147 1148config ADVANCED_OPTIONS 1149 bool "Prompt for advanced kernel configuration options" 1150 help 1151 This option will enable prompting for a variety of advanced kernel 1152 configuration options. These options can cause the kernel to not 1153 work if they are set incorrectly, but can be used to optimize certain 1154 aspects of kernel memory management. 1155 1156 Unless you know what you are doing, say N here. 1157 1158comment "Default settings for advanced configuration options are used" 1159 depends on !ADVANCED_OPTIONS 1160 1161config LOWMEM_SIZE_BOOL 1162 bool "Set maximum low memory" 1163 depends on ADVANCED_OPTIONS 1164 help 1165 This option allows you to set the maximum amount of memory which 1166 will be used as "low memory", that is, memory which the kernel can 1167 access directly, without having to set up a kernel virtual mapping. 1168 This can be useful in optimizing the layout of kernel virtual 1169 memory. 1170 1171 Say N here unless you know what you are doing. 1172 1173config LOWMEM_SIZE 1174 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL 1175 default "0x30000000" 1176 1177config LOWMEM_CAM_NUM_BOOL 1178 bool "Set number of CAMs to use to map low memory" 1179 depends on ADVANCED_OPTIONS && PPC_85xx 1180 help 1181 This option allows you to set the maximum number of CAM slots that 1182 will be used to map low memory. There are a limited number of slots 1183 available and even more limited number that will fit in the L1 MMU. 1184 However, using more entries will allow mapping more low memory. This 1185 can be useful in optimizing the layout of kernel virtual memory. 1186 1187 Say N here unless you know what you are doing. 1188 1189config LOWMEM_CAM_NUM 1190 depends on PPC_85xx 1191 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL 1192 default 3 if !STRICT_KERNEL_RWX 1193 default 9 if DATA_SHIFT >= 24 1194 default 12 if DATA_SHIFT >= 22 1195 default 15 1196 1197config DYNAMIC_MEMSTART 1198 bool "Enable page aligned dynamic load address for kernel" 1199 depends on ADVANCED_OPTIONS && FLATMEM && (PPC_85xx || 44x) 1200 select NONSTATIC_KERNEL 1201 help 1202 This option enables the kernel to be loaded at any page aligned 1203 physical address. The kernel creates a mapping from KERNELBASE to 1204 the address where the kernel is loaded. The page size here implies 1205 the TLB page size of the mapping for kernel on the particular platform. 1206 Please refer to the init code for finding the TLB page size. 1207 1208 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE 1209 kernel image, where the only restriction is the page aligned kernel 1210 load address. When this option is enabled, the compile time physical 1211 address CONFIG_PHYSICAL_START is ignored. 1212 1213 This option is overridden by CONFIG_RELOCATABLE 1214 1215config PAGE_OFFSET_BOOL 1216 bool "Set custom page offset address" 1217 depends on ADVANCED_OPTIONS 1218 help 1219 This option allows you to set the kernel virtual address at which 1220 the kernel will map low memory. This can be useful in optimizing 1221 the virtual memory layout of the system. 1222 1223 Say N here unless you know what you are doing. 1224 1225config PAGE_OFFSET 1226 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL 1227 default "0xc0000000" 1228 1229config KERNEL_START_BOOL 1230 bool "Set custom kernel base address" 1231 depends on ADVANCED_OPTIONS 1232 help 1233 This option allows you to set the kernel virtual address at which 1234 the kernel will be loaded. Normally this should match PAGE_OFFSET 1235 however there are times (like kdump) that one might not want them 1236 to be the same. 1237 1238 Say N here unless you know what you are doing. 1239 1240config KERNEL_START 1241 hex "Virtual address of kernel base" if KERNEL_START_BOOL 1242 default PAGE_OFFSET if PAGE_OFFSET_BOOL 1243 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL 1244 default "0xc0000000" 1245 1246config PHYSICAL_START_BOOL 1247 bool "Set physical address where the kernel is loaded" 1248 depends on ADVANCED_OPTIONS && FLATMEM && PPC_85xx 1249 help 1250 This gives the physical address where the kernel is loaded. 1251 1252 Say N here unless you know what you are doing. 1253 1254config PHYSICAL_START 1255 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL 1256 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL 1257 default "0x00000000" 1258 1259config PHYSICAL_ALIGN 1260 hex 1261 default "0x04000000" if PPC_85xx 1262 help 1263 This value puts the alignment restrictions on physical address 1264 where kernel is loaded and run from. Kernel is compiled for an 1265 address which meets above alignment restriction. 1266 1267config TASK_SIZE_BOOL 1268 bool "Set custom user task size" 1269 depends on ADVANCED_OPTIONS 1270 help 1271 This option allows you to set the amount of virtual address space 1272 allocated to user tasks. This can be useful in optimizing the 1273 virtual memory layout of the system. 1274 1275 Say N here unless you know what you are doing. 1276 1277config TASK_SIZE 1278 hex "Size of user task space" if TASK_SIZE_BOOL 1279 default "0x80000000" if PPC_8xx 1280 default "0xb0000000" if PPC_BOOK3S_32 1281 default "0xc0000000" 1282endmenu 1283 1284if PPC64 1285# This value must have zeroes in the bottom 60 bits otherwise lots will break 1286config PAGE_OFFSET 1287 hex 1288 default "0xc000000000000000" 1289config KERNEL_START 1290 hex 1291 default "0xc000000000000000" 1292config PHYSICAL_START 1293 hex 1294 default "0x00000000" 1295endif 1296 1297config PPC_LIB_RHEAP 1298 bool 1299 1300source "arch/powerpc/kvm/Kconfig" 1301 1302source "kernel/livepatch/Kconfig" 1303