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 CC_HAS_PREFIXED 8 def_bool PPC64 && $(cc-option, -mcpu=power10 -mprefixed) 9 10config CC_HAS_PCREL 11 # Clang has a bug (https://github.com/llvm/llvm-project/issues/62372) 12 # where pcrel code is not generated if -msoft-float, -mno-altivec, or 13 # -mno-vsx options are also given. Without these options, fp/vec 14 # instructions are generated from regular kernel code. So Clang can't 15 # do pcrel yet. 16 def_bool PPC64 && CC_IS_GCC && $(cc-option, -mcpu=power10 -mpcrel) 17 18config 32BIT 19 bool 20 default y if PPC32 21 22config 64BIT 23 bool 24 default y if PPC64 25 26config LIVEPATCH_64 27 def_bool PPC64 28 depends on LIVEPATCH 29 30config MMU 31 bool 32 default y 33 34config ARCH_MMAP_RND_BITS_MAX 35 # On Book3S 64, the default virtual address space for 64-bit processes 36 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to 37 # 32T of address space (2^45), which should ensure a reasonable gap 38 # between bottom-up and top-down allocations for applications that 39 # consume "normal" amounts of address space. Book3S 64 only supports 64K 40 # and 4K page sizes. 41 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K) 42 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K) 43 # 44 # On all other 64-bit platforms (currently only Book3E), the virtual 45 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T 46 # of address space (2^44). Only 4K page sizes are supported. 47 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K) 48 # 49 # For 32-bit, use the compat values, as they're the same. 50 default ARCH_MMAP_RND_COMPAT_BITS_MAX 51 52config ARCH_MMAP_RND_BITS_MIN 53 # Allow randomisation to consume up to 1GB of address space (2^30). 54 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K) 55 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K) 56 # 57 # For 32-bit, use the compat values, as they're the same. 58 default ARCH_MMAP_RND_COMPAT_BITS_MIN 59 60config ARCH_MMAP_RND_COMPAT_BITS_MAX 61 # Total virtual address space for 32-bit processes is 2^31 (2GB). 62 # Allow randomisation to consume up to 512MB of address space (2^29). 63 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K) 64 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K) 65 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K) 66 default 17 # 17 = 29 (512MB) - 12 (4K) 67 68config ARCH_MMAP_RND_COMPAT_BITS_MIN 69 # Total virtual address space for 32-bit processes is 2^31 (2GB). 70 # Allow randomisation to consume up to 8MB of address space (2^23). 71 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K) 72 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K) 73 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K) 74 default 11 # 11 = 23 (8MB) - 12 (4K) 75 76config NR_IRQS 77 int "Number of virtual interrupt numbers" 78 range 32 1048576 79 default "512" 80 help 81 This defines the number of virtual interrupt numbers the kernel 82 can manage. Virtual interrupt numbers are what you see in 83 /proc/interrupts. If you configure your system to have too few, 84 drivers will fail to load or worse - handle with care. 85 86config NMI_IPI 87 bool 88 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR) 89 default y 90 91config PPC_WATCHDOG 92 bool 93 depends on HARDLOCKUP_DETECTOR_ARCH 94 default y 95 help 96 This is a placeholder when the powerpc hardlockup detector 97 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is 98 selected via the generic lockup detector menu which is why we 99 have no standalone config option for it here. 100 101config STACKTRACE_SUPPORT 102 bool 103 default y 104 105config LOCKDEP_SUPPORT 106 bool 107 default y 108 109config GENERIC_LOCKBREAK 110 bool 111 default y 112 depends on SMP && PREEMPTION && !PPC_QUEUED_SPINLOCKS 113 114config GENERIC_HWEIGHT 115 bool 116 default y 117 118config PPC 119 bool 120 default y 121 # 122 # Please keep this list sorted alphabetically. 123 # 124 select ARCH_32BIT_OFF_T if PPC32 125 select ARCH_DISABLE_KASAN_INLINE if PPC_RADIX_MMU 126 select ARCH_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE 127 select ARCH_ENABLE_MEMORY_HOTPLUG 128 select ARCH_ENABLE_MEMORY_HOTREMOVE 129 select ARCH_HAS_COPY_MC if PPC64 130 select ARCH_HAS_CURRENT_STACK_POINTER 131 select ARCH_HAS_DEBUG_VIRTUAL 132 select ARCH_HAS_DEBUG_VM_PGTABLE 133 select ARCH_HAS_DEBUG_WX if STRICT_KERNEL_RWX 134 select ARCH_HAS_DEVMEM_IS_ALLOWED 135 select ARCH_HAS_DMA_MAP_DIRECT if PPC_PSERIES 136 select ARCH_HAS_FORTIFY_SOURCE 137 select ARCH_HAS_GCOV_PROFILE_ALL 138 select ARCH_HAS_HUGEPD if HUGETLB_PAGE 139 select ARCH_HAS_KCOV 140 select ARCH_HAS_MEMBARRIER_CALLBACKS 141 select ARCH_HAS_MEMBARRIER_SYNC_CORE 142 select ARCH_HAS_MEMREMAP_COMPAT_ALIGN if PPC_64S_HASH_MMU 143 select ARCH_HAS_MMIOWB if PPC64 144 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE 145 select ARCH_HAS_PHYS_TO_DMA 146 select ARCH_HAS_PMEM_API 147 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64 148 select ARCH_HAS_PTE_SPECIAL 149 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64 150 select ARCH_HAS_SET_MEMORY 151 select ARCH_HAS_STRICT_KERNEL_RWX if (PPC_BOOK3S || PPC_8xx || 40x) && !HIBERNATION 152 select ARCH_HAS_STRICT_KERNEL_RWX if PPC_85xx && !HIBERNATION && !RANDOMIZE_BASE 153 select ARCH_HAS_STRICT_MODULE_RWX if ARCH_HAS_STRICT_KERNEL_RWX 154 select ARCH_HAS_SYSCALL_WRAPPER if !SPU_BASE && !COMPAT 155 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 156 select ARCH_HAS_UACCESS_FLUSHCACHE 157 select ARCH_HAS_UBSAN_SANITIZE_ALL 158 select ARCH_HAVE_NMI_SAFE_CMPXCHG 159 select ARCH_KEEP_MEMBLOCK 160 select ARCH_MIGHT_HAVE_PC_PARPORT 161 select ARCH_MIGHT_HAVE_PC_SERIO 162 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX 163 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT 164 select ARCH_SPLIT_ARG64 if PPC32 165 select ARCH_STACKWALK 166 select ARCH_SUPPORTS_ATOMIC_RMW 167 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC_BOOK3S || PPC_8xx || 40x 168 select ARCH_USE_BUILTIN_BSWAP 169 select ARCH_USE_CMPXCHG_LOCKREF if PPC64 170 select ARCH_USE_MEMTEST 171 select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS 172 select ARCH_WANT_DEFAULT_BPF_JIT 173 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT 174 select ARCH_WANT_IPC_PARSE_VERSION 175 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM 176 select ARCH_WANT_LD_ORPHAN_WARN 177 select ARCH_WANTS_MODULES_DATA_IN_VMALLOC if PPC_BOOK3S_32 || PPC_8xx 178 select ARCH_WEAK_RELEASE_ACQUIRE 179 select BINFMT_ELF 180 select BUILDTIME_TABLE_SORT 181 select CLONE_BACKWARDS 182 select CPUMASK_OFFSTACK if NR_CPUS >= 8192 183 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN 184 select DMA_OPS_BYPASS if PPC64 185 select DMA_OPS if PPC64 186 select DYNAMIC_FTRACE if FUNCTION_TRACER 187 select EDAC_ATOMIC_SCRUB 188 select EDAC_SUPPORT 189 select GENERIC_ATOMIC64 if PPC32 190 select GENERIC_CLOCKEVENTS_BROADCAST if SMP 191 select GENERIC_CMOS_UPDATE 192 select GENERIC_CPU_AUTOPROBE 193 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC 194 select GENERIC_EARLY_IOREMAP 195 select GENERIC_GETTIMEOFDAY 196 select GENERIC_IRQ_SHOW 197 select GENERIC_IRQ_SHOW_LEVEL 198 select GENERIC_PCI_IOMAP if PCI 199 select GENERIC_PTDUMP 200 select GENERIC_SMP_IDLE_THREAD 201 select GENERIC_TIME_VSYSCALL 202 select GENERIC_VDSO_TIME_NS 203 select HAS_IOPORT if PCI 204 select HAVE_ARCH_AUDITSYSCALL 205 select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP 206 select HAVE_ARCH_HUGE_VMAP if PPC_RADIX_MMU || PPC_8xx 207 select HAVE_ARCH_JUMP_LABEL 208 select HAVE_ARCH_JUMP_LABEL_RELATIVE 209 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14 210 select HAVE_ARCH_KASAN if PPC_RADIX_MMU 211 select HAVE_ARCH_KASAN if PPC_BOOK3E_64 212 select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN 213 select HAVE_ARCH_KCSAN 214 select HAVE_ARCH_KFENCE if ARCH_SUPPORTS_DEBUG_PAGEALLOC 215 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET 216 select HAVE_ARCH_WITHIN_STACK_FRAMES 217 select HAVE_ARCH_KGDB 218 select HAVE_ARCH_MMAP_RND_BITS 219 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT 220 select HAVE_ARCH_NVRAM_OPS 221 select HAVE_ARCH_SECCOMP_FILTER 222 select HAVE_ARCH_TRACEHOOK 223 select HAVE_ASM_MODVERSIONS 224 select HAVE_CONTEXT_TRACKING_USER 225 select HAVE_C_RECORDMCOUNT 226 select HAVE_DEBUG_KMEMLEAK 227 select HAVE_DEBUG_STACKOVERFLOW 228 select HAVE_DYNAMIC_FTRACE 229 select HAVE_DYNAMIC_FTRACE_WITH_ARGS if MPROFILE_KERNEL || PPC32 230 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL || PPC32 231 select HAVE_EBPF_JIT 232 select HAVE_EFFICIENT_UNALIGNED_ACCESS 233 select HAVE_FAST_GUP 234 select HAVE_FTRACE_MCOUNT_RECORD 235 select HAVE_FUNCTION_DESCRIPTORS if PPC64_ELF_ABI_V1 236 select HAVE_FUNCTION_ERROR_INJECTION 237 select HAVE_FUNCTION_GRAPH_TRACER 238 select HAVE_FUNCTION_TRACER if PPC64 || (PPC32 && CC_IS_GCC) 239 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC 240 select HAVE_GENERIC_VDSO 241 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC_BOOK3S_64 && SMP 242 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI 243 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx) 244 select HAVE_IOREMAP_PROT 245 select HAVE_IRQ_TIME_ACCOUNTING 246 select HAVE_KERNEL_GZIP 247 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE 248 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE 249 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x 250 select HAVE_KPROBES 251 select HAVE_KPROBES_ON_FTRACE 252 select HAVE_KRETPROBES 253 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if HAVE_OBJTOOL_MCOUNT 254 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS 255 select HAVE_MOD_ARCH_SPECIFIC 256 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S) 257 select HAVE_OPTPROBES 258 select HAVE_OBJTOOL if PPC32 || MPROFILE_KERNEL 259 select HAVE_OBJTOOL_MCOUNT if HAVE_OBJTOOL 260 select HAVE_PERF_EVENTS 261 select HAVE_PERF_EVENTS_NMI if PPC64 262 select HAVE_PERF_REGS 263 select HAVE_PERF_USER_STACK_DUMP 264 select HAVE_REGS_AND_STACK_ACCESS_API 265 select HAVE_RELIABLE_STACKTRACE 266 select HAVE_RSEQ 267 select HAVE_SETUP_PER_CPU_AREA if PPC64 268 select HAVE_SOFTIRQ_ON_OWN_STACK 269 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2) 270 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13) 271 select HAVE_STATIC_CALL if PPC32 272 select HAVE_SYSCALL_TRACEPOINTS 273 select HAVE_VIRT_CPU_ACCOUNTING 274 select HAVE_VIRT_CPU_ACCOUNTING_GEN 275 select HUGETLB_PAGE_SIZE_VARIABLE if PPC_BOOK3S_64 && HUGETLB_PAGE 276 select IOMMU_HELPER if PPC64 277 select IRQ_DOMAIN 278 select IRQ_FORCED_THREADING 279 select KASAN_VMALLOC if KASAN && MODULES 280 select LOCK_MM_AND_FIND_VMA 281 select MMU_GATHER_PAGE_SIZE 282 select MMU_GATHER_RCU_TABLE_FREE 283 select MMU_GATHER_MERGE_VMAS 284 select MMU_LAZY_TLB_SHOOTDOWN if PPC_BOOK3S_64 285 select MODULES_USE_ELF_RELA 286 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE 287 select NEED_PER_CPU_EMBED_FIRST_CHUNK if PPC64 288 select NEED_PER_CPU_PAGE_FIRST_CHUNK if PPC64 289 select NEED_SG_DMA_LENGTH 290 select OF 291 select OF_EARLY_FLATTREE 292 select OLD_SIGACTION if PPC32 293 select OLD_SIGSUSPEND 294 select PCI_DOMAINS if PCI 295 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI 296 select PCI_SYSCALL if PCI 297 select PPC_DAWR if PPC64 298 select RTC_LIB 299 select SPARSE_IRQ 300 select STRICT_KERNEL_RWX if STRICT_MODULE_RWX 301 select SYSCTL_EXCEPTION_TRACE 302 select THREAD_INFO_IN_TASK 303 select TRACE_IRQFLAGS_SUPPORT 304 # 305 # Please keep this list sorted alphabetically. 306 # 307 308config PPC_BARRIER_NOSPEC 309 bool 310 default y 311 depends on PPC_BOOK3S_64 || PPC_E500 312 313config PPC_HAS_LBARX_LHARX 314 bool 315 316config EARLY_PRINTK 317 bool 318 default y 319 320config PANIC_TIMEOUT 321 int 322 default 180 323 324config COMPAT 325 bool "Enable support for 32bit binaries" 326 depends on PPC64 327 depends on !CC_IS_CLANG || CLANG_VERSION >= 120000 328 default y if !CPU_LITTLE_ENDIAN 329 select ARCH_WANT_OLD_COMPAT_IPC 330 select COMPAT_OLD_SIGACTION 331 332config SCHED_OMIT_FRAME_POINTER 333 bool 334 default y 335 336config ARCH_MAY_HAVE_PC_FDC 337 bool 338 default PCI 339 340config PPC_UDBG_16550 341 bool 342 343config GENERIC_TBSYNC 344 bool 345 default y if PPC32 && SMP 346 347config AUDIT_ARCH 348 bool 349 default y 350 351config GENERIC_BUG 352 bool 353 default y 354 depends on BUG 355 356config GENERIC_BUG_RELATIVE_POINTERS 357 def_bool y 358 depends on GENERIC_BUG 359 360config SYS_SUPPORTS_APM_EMULATION 361 default y if PMAC_APM_EMU 362 bool 363 364config EPAPR_BOOT 365 bool 366 help 367 Used to allow a board to specify it wants an ePAPR compliant wrapper. 368 369config DEFAULT_UIMAGE 370 bool 371 help 372 Used to allow a board to specify it wants a uImage built by default 373 374config ARCH_HIBERNATION_POSSIBLE 375 bool 376 default y 377 378config ARCH_SUSPEND_POSSIBLE 379 def_bool y 380 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \ 381 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \ 382 || 44x || 40x 383 384config ARCH_SUSPEND_NONZERO_CPU 385 def_bool y 386 depends on PPC_POWERNV || PPC_PSERIES 387 388config ARCH_HAS_ADD_PAGES 389 def_bool y 390 depends on ARCH_ENABLE_MEMORY_HOTPLUG 391 392config PPC_DCR_NATIVE 393 bool 394 395config PPC_DCR_MMIO 396 bool 397 398config PPC_DCR 399 bool 400 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO 401 default y 402 403config PPC_PCI_OF_BUS_MAP 404 bool "Use pci_to_OF_bus_map (deprecated)" 405 depends on PPC32 406 depends on PPC_PMAC || PPC_CHRP 407 help 408 This option uses pci_to_OF_bus_map to map OF nodes to PCI devices, which 409 restricts the system to only having 256 PCI buses. On CHRP it also causes 410 the "pci-OF-bus-map" property to be created in the device tree. 411 412 If unsure, say "N". 413 414config PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT 415 depends on PPC32 416 depends on !PPC_PCI_OF_BUS_MAP 417 bool "Assign PCI bus numbers from zero individually for each PCI domain" 418 default y 419 help 420 By default on PPC32 were PCI bus numbers unique across all PCI domains. 421 So system could have only 256 PCI buses independently of available 422 PCI domains. When this option is enabled then PCI bus numbers are 423 PCI domain dependent and each PCI controller on own domain can have 424 256 PCI buses, like it is on other Linux architectures. 425 426config PPC_OF_PLATFORM_PCI 427 bool 428 depends on PCI 429 depends on PPC64 # not supported on 32 bits yet 430 431config ARCH_SUPPORTS_UPROBES 432 def_bool y 433 434config PPC_ADV_DEBUG_REGS 435 bool 436 depends on 40x || BOOKE 437 default y 438 439config PPC_ADV_DEBUG_IACS 440 int 441 depends on PPC_ADV_DEBUG_REGS 442 default 4 if 44x 443 default 2 444 445config PPC_ADV_DEBUG_DACS 446 int 447 depends on PPC_ADV_DEBUG_REGS 448 default 2 449 450config PPC_ADV_DEBUG_DVCS 451 int 452 depends on PPC_ADV_DEBUG_REGS 453 default 2 if 44x 454 default 0 455 456config PPC_ADV_DEBUG_DAC_RANGE 457 bool 458 depends on PPC_ADV_DEBUG_REGS && 44x 459 default y 460 461config PPC_DAWR 462 bool 463 464config PGTABLE_LEVELS 465 int 466 default 2 if !PPC64 467 default 4 468 469source "arch/powerpc/sysdev/Kconfig" 470source "arch/powerpc/platforms/Kconfig" 471 472menu "Kernel options" 473 474config HIGHMEM 475 bool "High memory support" 476 depends on PPC32 477 select KMAP_LOCAL 478 479source "kernel/Kconfig.hz" 480 481config MATH_EMULATION 482 bool "Math emulation" 483 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT 484 select PPC_FPU_REGS 485 help 486 Some PowerPC chips designed for embedded applications do not have 487 a floating-point unit and therefore do not implement the 488 floating-point instructions in the PowerPC instruction set. If you 489 say Y here, the kernel will include code to emulate a floating-point 490 unit, which will allow programs that use floating-point 491 instructions to run. 492 493 This is also useful to emulate missing (optional) instructions 494 such as fsqrt on cores that do have an FPU but do not implement 495 them (such as Freescale BookE). 496 497choice 498 prompt "Math emulation options" 499 default MATH_EMULATION_FULL 500 depends on MATH_EMULATION 501 502config MATH_EMULATION_FULL 503 bool "Emulate all the floating point instructions" 504 help 505 Select this option will enable the kernel to support to emulate 506 all the floating point instructions. If your SoC doesn't have 507 a FPU, you should select this. 508 509config MATH_EMULATION_HW_UNIMPLEMENTED 510 bool "Just emulate the FPU unimplemented instructions" 511 help 512 Select this if you know there does have a hardware FPU on your 513 SoC, but some floating point instructions are not implemented by that. 514 515endchoice 516 517config PPC_TRANSACTIONAL_MEM 518 bool "Transactional Memory support for POWERPC" 519 depends on PPC_BOOK3S_64 520 depends on SMP 521 select ALTIVEC 522 select VSX 523 help 524 Support user-mode Transactional Memory on POWERPC. 525 526config PPC_UV 527 bool "Ultravisor support" 528 depends on KVM_BOOK3S_HV_POSSIBLE 529 depends on DEVICE_PRIVATE 530 default n 531 help 532 This option paravirtualizes the kernel to run in POWER platforms that 533 supports the Protected Execution Facility (PEF). On such platforms, 534 the ultravisor firmware runs at a privilege level above the 535 hypervisor. 536 537 If unsure, say "N". 538 539config LD_HEAD_STUB_CATCH 540 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT 541 depends on PPC64 542 help 543 Very large kernels can cause linker branch stubs to be generated by 544 code in head_64.S, which moves the head text sections out of their 545 specified location. This option can work around the problem. 546 547 If unsure, say "N". 548 549config MPROFILE_KERNEL 550 depends on PPC64_ELF_ABI_V2 && FUNCTION_TRACER 551 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -mlittle-endian) if CPU_LITTLE_ENDIAN 552 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -mbig-endian) if CPU_BIG_ENDIAN 553 554config HOTPLUG_CPU 555 bool "Support for enabling/disabling CPUs" 556 depends on SMP && (PPC_PSERIES || \ 557 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE) 558 help 559 Say Y here to be able to disable and re-enable individual 560 CPUs at runtime on SMP machines. 561 562 Say N if you are unsure. 563 564config INTERRUPT_SANITIZE_REGISTERS 565 bool "Clear gprs on interrupt arrival" 566 depends on PPC64 && ARCH_HAS_SYSCALL_WRAPPER 567 default PPC_BOOK3E_64 || PPC_PSERIES || PPC_POWERNV 568 help 569 Reduce the influence of user register state on interrupt handlers and 570 syscalls through clearing user state from registers before handling 571 the exception. 572 573config PPC_QUEUED_SPINLOCKS 574 bool "Queued spinlocks" if EXPERT 575 depends on SMP 576 default PPC_BOOK3S_64 577 help 578 Say Y here to use queued spinlocks which give better scalability and 579 fairness on large SMP and NUMA systems without harming single threaded 580 performance. 581 582config ARCH_CPU_PROBE_RELEASE 583 def_bool y 584 depends on HOTPLUG_CPU 585 586config PPC64_SUPPORTS_MEMORY_FAILURE 587 bool "Add support for memory hwpoison" 588 depends on PPC_BOOK3S_64 589 default "y" if PPC_POWERNV 590 select ARCH_SUPPORTS_MEMORY_FAILURE 591 592config ARCH_SUPPORTS_KEXEC 593 def_bool PPC_BOOK3S || PPC_E500 || (44x && !SMP) 594 595config ARCH_SUPPORTS_KEXEC_FILE 596 def_bool PPC64 && CRYPTO=y && CRYPTO_SHA256=y 597 598config ARCH_SUPPORTS_KEXEC_PURGATORY 599 def_bool KEXEC_FILE 600 601config ARCH_SELECTS_KEXEC_FILE 602 def_bool y 603 depends on KEXEC_FILE 604 select KEXEC_ELF 605 select HAVE_IMA_KEXEC if IMA 606 607config PPC64_BIG_ENDIAN_ELF_ABI_V2 608 # Option is available to BFD, but LLD does not support ELFv1 so this is 609 # always true there. 610 prompt "Build big-endian kernel using ELF ABI V2" if LD_IS_BFD && EXPERT 611 def_bool y 612 depends on PPC64 && CPU_BIG_ENDIAN 613 depends on CC_HAS_ELFV2 614 help 615 This builds the kernel image using the "Power Architecture 64-Bit ELF 616 V2 ABI Specification", which has a reduced stack overhead and faster 617 function calls. This internal kernel ABI option does not affect 618 userspace compatibility. 619 620 The V2 ABI is standard for 64-bit little-endian, but for big-endian 621 it is less well tested by kernel and toolchain. However some distros 622 build userspace this way, and it can produce a functioning kernel. 623 624config RELOCATABLE 625 bool "Build a relocatable kernel" 626 depends on PPC64 || (FLATMEM && (44x || PPC_85xx)) 627 select NONSTATIC_KERNEL 628 help 629 This builds a kernel image that is capable of running at the 630 location the kernel is loaded at. For ppc32, there is no any 631 alignment restrictions, and this feature is a superset of 632 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use 633 16k-aligned base address. The kernel is linked as a 634 position-independent executable (PIE) and contains dynamic relocations 635 which are processed early in the bootup process. 636 637 One use is for the kexec on panic case where the recovery kernel 638 must live at a different physical address than the primary 639 kernel. 640 641 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address 642 it has been loaded at and the compile time physical addresses 643 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START 644 setting can still be useful to bootwrappers that need to know the 645 load address of the kernel (eg. u-boot/mkimage). 646 647config RANDOMIZE_BASE 648 bool "Randomize the address of the kernel image" 649 depends on PPC_85xx && FLATMEM 650 depends on RELOCATABLE 651 help 652 Randomizes the virtual address at which the kernel image is 653 loaded, as a security feature that deters exploit attempts 654 relying on knowledge of the location of kernel internals. 655 656 If unsure, say Y. 657 658config RELOCATABLE_TEST 659 bool "Test relocatable kernel" 660 depends on (PPC64 && RELOCATABLE) 661 help 662 This runs the relocatable kernel at the address it was initially 663 loaded at, which tends to be non-zero and therefore test the 664 relocation code. 665 666config ARCH_SUPPORTS_CRASH_DUMP 667 def_bool PPC64 || PPC_BOOK3S_32 || PPC_85xx || (44x && !SMP) 668 669config ARCH_SELECTS_CRASH_DUMP 670 def_bool y 671 depends on CRASH_DUMP 672 select RELOCATABLE if PPC64 || 44x || PPC_85xx 673 674config FA_DUMP 675 bool "Firmware-assisted dump" 676 depends on PPC64 && (PPC_RTAS || PPC_POWERNV) 677 select CRASH_CORE 678 select CRASH_DUMP 679 help 680 A robust mechanism to get reliable kernel crash dump with 681 assistance from firmware. This approach does not use kexec, 682 instead firmware assists in booting the capture kernel 683 while preserving memory contents. Firmware-assisted dump 684 is meant to be a kdump replacement offering robustness and 685 speed not possible without system firmware assistance. 686 687 If unsure, say "y". Only special kernels like petitboot may 688 need to say "N" here. 689 690config PRESERVE_FA_DUMP 691 bool "Preserve Firmware-assisted dump" 692 depends on PPC64 && PPC_POWERNV && !FA_DUMP 693 help 694 On a kernel with FA_DUMP disabled, this option helps to preserve 695 crash data from a previously crash'ed kernel. Useful when the next 696 memory preserving kernel boot would process this crash data. 697 Petitboot kernel is the typical usecase for this option. 698 699config OPAL_CORE 700 bool "Export OPAL memory as /sys/firmware/opal/core" 701 depends on PPC64 && PPC_POWERNV 702 help 703 This option uses the MPIPL support in firmware to provide an 704 ELF core of OPAL memory after a crash. The ELF core is exported 705 as /sys/firmware/opal/core file which is helpful in debugging 706 OPAL crashes using GDB. 707 708config IRQ_ALL_CPUS 709 bool "Distribute interrupts on all CPUs by default" 710 depends on SMP 711 help 712 This option gives the kernel permission to distribute IRQs across 713 multiple CPUs. Saying N here will route all IRQs to the first 714 CPU. Generally saying Y is safe, although some problems have been 715 reported with SMP Power Macintoshes with this option enabled. 716 717config NUMA 718 bool "NUMA Memory Allocation and Scheduler Support" 719 depends on PPC64 && SMP 720 default y if PPC_PSERIES || PPC_POWERNV 721 select USE_PERCPU_NUMA_NODE_ID 722 help 723 Enable NUMA (Non-Uniform Memory Access) support. 724 725 The kernel will try to allocate memory used by a CPU on the 726 local memory controller of the CPU and add some more 727 NUMA awareness to the kernel. 728 729config NODES_SHIFT 730 int 731 default "8" if PPC64 732 default "4" 733 depends on NUMA 734 735config HAVE_MEMORYLESS_NODES 736 def_bool y 737 depends on NUMA 738 739config ARCH_SELECT_MEMORY_MODEL 740 def_bool y 741 depends on PPC64 742 743config ARCH_FLATMEM_ENABLE 744 def_bool y 745 depends on (PPC64 && !NUMA) || PPC32 746 747config ARCH_SPARSEMEM_ENABLE 748 def_bool y 749 depends on PPC64 750 select SPARSEMEM_VMEMMAP_ENABLE 751 752config ARCH_SPARSEMEM_DEFAULT 753 def_bool y 754 depends on PPC_BOOK3S_64 755 756config ILLEGAL_POINTER_VALUE 757 hex 758 # This is roughly half way between the top of user space and the bottom 759 # of kernel space, which seems about as good as we can get. 760 default 0x5deadbeef0000000 if PPC64 761 default 0 762 763config ARCH_MEMORY_PROBE 764 def_bool y 765 depends on MEMORY_HOTPLUG 766 767choice 768 prompt "Page size" 769 default PPC_64K_PAGES if PPC_BOOK3S_64 770 default PPC_4K_PAGES 771 help 772 Select the kernel logical page size. Increasing the page size 773 will reduce software overhead at each page boundary, allow 774 hardware prefetch mechanisms to be more effective, and allow 775 larger dma transfers increasing IO efficiency and reducing 776 overhead. However the utilization of memory will increase. 777 For example, each cached file will using a multiple of the 778 page size to hold its contents and the difference between the 779 end of file and the end of page is wasted. 780 781 Some dedicated systems, such as software raid serving with 782 accelerated calculations, have shown significant increases. 783 784 If you configure a 64 bit kernel for 64k pages but the 785 processor does not support them, then the kernel will simulate 786 them with 4k pages, loading them on demand, but with the 787 reduced software overhead and larger internal fragmentation. 788 For the 32 bit kernel, a large page option will not be offered 789 unless it is supported by the configured processor. 790 791 If unsure, choose 4K_PAGES. 792 793config PPC_4K_PAGES 794 bool "4k page size" 795 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 796 797config PPC_16K_PAGES 798 bool "16k page size" 799 depends on 44x || PPC_8xx 800 801config PPC_64K_PAGES 802 bool "64k page size" 803 depends on 44x || PPC_BOOK3S_64 804 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 805 806config PPC_256K_PAGES 807 bool "256k page size (Requires non-standard binutils settings)" 808 depends on 44x && !PPC_47x 809 help 810 Make the page size 256k. 811 812 The kernel will only be able to run applications that have been 813 compiled with '-zmax-page-size' set to 256K (the default is 64K) using 814 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE 815 definition from 0x10000 to 0x40000 in older versions. 816 817endchoice 818 819config PAGE_SIZE_4KB 820 def_bool y 821 depends on PPC_4K_PAGES 822 823config PAGE_SIZE_16KB 824 def_bool y 825 depends on PPC_16K_PAGES 826 827config PAGE_SIZE_64KB 828 def_bool y 829 depends on PPC_64K_PAGES 830 831config PAGE_SIZE_256KB 832 def_bool y 833 depends on PPC_256K_PAGES 834 835config PPC_PAGE_SHIFT 836 int 837 default 18 if PPC_256K_PAGES 838 default 16 if PPC_64K_PAGES 839 default 14 if PPC_16K_PAGES 840 default 12 841 842config THREAD_SHIFT 843 int "Thread shift" if EXPERT 844 range 13 15 845 default "15" if PPC_256K_PAGES 846 default "14" if PPC64 847 default "13" 848 help 849 Used to define the stack size. The default is almost always what you 850 want. Only change this if you know what you are doing. 851 852config DATA_SHIFT_BOOL 853 bool "Set custom data alignment" 854 depends on ADVANCED_OPTIONS 855 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE 856 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX) || \ 857 PPC_85xx 858 help 859 This option allows you to set the kernel data alignment. When 860 RAM is mapped by blocks, the alignment needs to fit the size and 861 number of possible blocks. The default should be OK for most configs. 862 863 Say N here unless you know what you are doing. 864 865config DATA_SHIFT 866 int "Data shift" if DATA_SHIFT_BOOL 867 default 24 if STRICT_KERNEL_RWX && PPC64 868 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32 869 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx 870 range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_85xx 871 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32 872 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32 873 default 23 if STRICT_KERNEL_RWX && PPC_8xx 874 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA 875 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx 876 default 24 if STRICT_KERNEL_RWX && PPC_85xx 877 default PPC_PAGE_SHIFT 878 help 879 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO. 880 Smaller is the alignment, greater is the number of necessary DBATs. 881 882 On 8xx, large pages (512kb or 8M) are used to map kernel linear 883 memory. Aligning to 8M reduces TLB misses as only 8M pages are used 884 in that case. If PIN_TLB is selected, it must be aligned to 8M as 885 8M pages will be pinned. 886 887config ARCH_FORCE_MAX_ORDER 888 int "Order of maximal physically contiguous allocations" 889 range 7 8 if PPC64 && PPC_64K_PAGES 890 default "8" if PPC64 && PPC_64K_PAGES 891 range 12 12 if PPC64 && !PPC_64K_PAGES 892 default "12" if PPC64 && !PPC_64K_PAGES 893 range 8 10 if PPC32 && PPC_16K_PAGES 894 default "8" if PPC32 && PPC_16K_PAGES 895 range 6 10 if PPC32 && PPC_64K_PAGES 896 default "6" if PPC32 && PPC_64K_PAGES 897 range 4 10 if PPC32 && PPC_256K_PAGES 898 default "4" if PPC32 && PPC_256K_PAGES 899 range 10 10 900 default "10" 901 help 902 The kernel page allocator limits the size of maximal physically 903 contiguous allocations. The limit is called MAX_ORDER and it 904 defines the maximal power of two of number of pages that can be 905 allocated as a single contiguous block. This option allows 906 overriding the default setting when ability to allocate very 907 large blocks of physically contiguous memory is required. 908 909 The page size is not necessarily 4KB. For example, on 64-bit 910 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep 911 this in mind when choosing a value for this option. 912 913 Don't change if unsure. 914 915config PPC_SUBPAGE_PROT 916 bool "Support setting protections for 4k subpages (subpage_prot syscall)" 917 default n 918 depends on PPC_64S_HASH_MMU && PPC_64K_PAGES 919 help 920 This option adds support for system call to allow user programs 921 to set access permissions (read/write, readonly, or no access) 922 on the 4k subpages of each 64k page. 923 924 If unsure, say N here. 925 926config PPC_PROT_SAO_LPAR 927 bool "Support PROT_SAO mappings in LPARs" 928 depends on PPC_BOOK3S_64 929 help 930 This option adds support for PROT_SAO mappings from userspace 931 inside LPARs on supported CPUs. 932 933 This may cause issues when performing guest migration from 934 a CPU that supports SAO to one that does not. 935 936 If unsure, say N here. 937 938config PPC_COPRO_BASE 939 bool 940 941config SCHED_SMT 942 bool "SMT (Hyperthreading) scheduler support" 943 depends on PPC64 && SMP 944 help 945 SMT scheduler support improves the CPU scheduler's decision making 946 when dealing with POWER5 cpus at a cost of slightly increased 947 overhead in some places. If unsure say N here. 948 949config PPC_DENORMALISATION 950 bool "PowerPC denormalisation exception handling" 951 depends on PPC_BOOK3S_64 952 default "y" if PPC_POWERNV 953 help 954 Add support for handling denormalisation of single precision 955 values. Useful for bare metal only. If unsure say Y here. 956 957config CMDLINE 958 string "Initial kernel command string" 959 default "" 960 help 961 On some platforms, there is currently no way for the boot loader to 962 pass arguments to the kernel. For these platforms, you can supply 963 some command-line options at build time by entering them here. In 964 most cases you will need to specify the root device here. 965 966choice 967 prompt "Kernel command line type" if CMDLINE != "" 968 default CMDLINE_FROM_BOOTLOADER 969 970config CMDLINE_FROM_BOOTLOADER 971 bool "Use bootloader kernel arguments if available" 972 help 973 Uses the command-line options passed by the boot loader. If 974 the boot loader doesn't provide any, the default kernel command 975 string provided in CMDLINE will be used. 976 977config CMDLINE_EXTEND 978 bool "Extend bootloader kernel arguments" 979 help 980 The command-line arguments provided by the boot loader will be 981 appended to the default kernel command string. 982 983config CMDLINE_FORCE 984 bool "Always use the default kernel command string" 985 help 986 Always use the default kernel command string, even if the boot 987 loader passes other arguments to the kernel. 988 This is useful if you cannot or don't want to change the 989 command-line options your boot loader passes to the kernel. 990 991endchoice 992 993config EXTRA_TARGETS 994 string "Additional default image types" 995 help 996 List additional targets to be built by the bootwrapper here (separated 997 by spaces). This is useful for targets that depend of device tree 998 files in the .dts directory. 999 1000 Targets in this list will be build as part of the default build 1001 target, or when the user does a 'make zImage' or a 1002 'make zImage.initrd'. 1003 1004 If unsure, leave blank 1005 1006config ARCH_WANTS_FREEZER_CONTROL 1007 def_bool y 1008 depends on ADB_PMU 1009 1010source "kernel/power/Kconfig" 1011 1012config PPC_MEM_KEYS 1013 prompt "PowerPC Memory Protection Keys" 1014 def_bool y 1015 depends on PPC_BOOK3S_64 1016 depends on PPC_64S_HASH_MMU 1017 select ARCH_USES_HIGH_VMA_FLAGS 1018 select ARCH_HAS_PKEYS 1019 help 1020 Memory Protection Keys provides a mechanism for enforcing 1021 page-based protections, but without requiring modification of the 1022 page tables when an application changes protection domains. 1023 1024 For details, see Documentation/core-api/protection-keys.rst 1025 1026 If unsure, say y. 1027 1028config PPC_SECURE_BOOT 1029 prompt "Enable secure boot support" 1030 bool 1031 depends on PPC_POWERNV || PPC_PSERIES 1032 depends on IMA_ARCH_POLICY 1033 imply IMA_SECURE_AND_OR_TRUSTED_BOOT 1034 select PSERIES_PLPKS if PPC_PSERIES 1035 help 1036 Systems with firmware secure boot enabled need to define security 1037 policies to extend secure boot to the OS. This config allows a user 1038 to enable OS secure boot on systems that have firmware support for 1039 it. If in doubt say N. 1040 1041config PPC_SECVAR_SYSFS 1042 bool "Enable sysfs interface for POWER secure variables" 1043 default y 1044 depends on PPC_SECURE_BOOT 1045 depends on SYSFS 1046 help 1047 POWER secure variables are managed and controlled by firmware. 1048 These variables are exposed to userspace via sysfs to enable 1049 read/write operations on these variables. Say Y if you have 1050 secure boot enabled and want to expose variables to userspace. 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