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 && !PPC_QUEUED_SPINLOCKS 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_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT 162 select ARCH_WANT_IPC_PARSE_VERSION 163 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM 164 select ARCH_WANT_LD_ORPHAN_WARN 165 select ARCH_WANTS_MODULES_DATA_IN_VMALLOC if PPC_BOOK3S_32 || PPC_8xx 166 select ARCH_WEAK_RELEASE_ACQUIRE 167 select BINFMT_ELF 168 select BUILDTIME_TABLE_SORT 169 select CLONE_BACKWARDS 170 select CPUMASK_OFFSTACK if NR_CPUS >= 8192 171 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN 172 select DMA_OPS_BYPASS if PPC64 173 select DMA_OPS if PPC64 174 select DYNAMIC_FTRACE if FUNCTION_TRACER 175 select EDAC_ATOMIC_SCRUB 176 select EDAC_SUPPORT 177 select GENERIC_ATOMIC64 if PPC32 178 select GENERIC_CLOCKEVENTS_BROADCAST if SMP 179 select GENERIC_CMOS_UPDATE 180 select GENERIC_CPU_AUTOPROBE 181 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC 182 select GENERIC_EARLY_IOREMAP 183 select GENERIC_GETTIMEOFDAY 184 select GENERIC_IRQ_SHOW 185 select GENERIC_IRQ_SHOW_LEVEL 186 select GENERIC_PCI_IOMAP if PCI 187 select GENERIC_PTDUMP 188 select GENERIC_SMP_IDLE_THREAD 189 select GENERIC_TIME_VSYSCALL 190 select GENERIC_VDSO_TIME_NS 191 select HAVE_ARCH_AUDITSYSCALL 192 select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP 193 select HAVE_ARCH_HUGE_VMAP if PPC_RADIX_MMU || PPC_8xx 194 select HAVE_ARCH_JUMP_LABEL 195 select HAVE_ARCH_JUMP_LABEL_RELATIVE 196 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14 197 select HAVE_ARCH_KASAN if PPC_RADIX_MMU 198 select HAVE_ARCH_KASAN if PPC_BOOK3E_64 199 select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN 200 select HAVE_ARCH_KCSAN if PPC_BOOK3S_64 201 select HAVE_ARCH_KFENCE if ARCH_SUPPORTS_DEBUG_PAGEALLOC 202 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET 203 select HAVE_ARCH_KGDB 204 select HAVE_ARCH_MMAP_RND_BITS 205 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT 206 select HAVE_ARCH_NVRAM_OPS 207 select HAVE_ARCH_SECCOMP_FILTER 208 select HAVE_ARCH_TRACEHOOK 209 select HAVE_ASM_MODVERSIONS 210 select HAVE_CONTEXT_TRACKING_USER 211 select HAVE_C_RECORDMCOUNT 212 select HAVE_DEBUG_KMEMLEAK 213 select HAVE_DEBUG_STACKOVERFLOW 214 select HAVE_DYNAMIC_FTRACE 215 select HAVE_DYNAMIC_FTRACE_WITH_ARGS if MPROFILE_KERNEL || PPC32 216 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL || PPC32 217 select HAVE_EBPF_JIT 218 select HAVE_EFFICIENT_UNALIGNED_ACCESS 219 select HAVE_FAST_GUP 220 select HAVE_FTRACE_MCOUNT_RECORD 221 select HAVE_FUNCTION_DESCRIPTORS if PPC64_ELF_ABI_V1 222 select HAVE_FUNCTION_ERROR_INJECTION 223 select HAVE_FUNCTION_GRAPH_TRACER 224 select HAVE_FUNCTION_TRACER 225 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC 226 select HAVE_GENERIC_VDSO 227 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC_BOOK3S_64 && SMP 228 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH 229 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx) 230 select HAVE_IOREMAP_PROT 231 select HAVE_IRQ_TIME_ACCOUNTING 232 select HAVE_KERNEL_GZIP 233 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE 234 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE 235 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x 236 select HAVE_KPROBES 237 select HAVE_KPROBES_ON_FTRACE 238 select HAVE_KRETPROBES 239 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if HAVE_OBJTOOL_MCOUNT 240 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS 241 select HAVE_MOD_ARCH_SPECIFIC 242 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S) 243 select HAVE_OPTPROBES 244 select HAVE_OBJTOOL if PPC32 || MPROFILE_KERNEL 245 select HAVE_OBJTOOL_MCOUNT if HAVE_OBJTOOL 246 select HAVE_PERF_EVENTS 247 select HAVE_PERF_EVENTS_NMI if PPC64 248 select HAVE_PERF_REGS 249 select HAVE_PERF_USER_STACK_DUMP 250 select HAVE_REGS_AND_STACK_ACCESS_API 251 select HAVE_RELIABLE_STACKTRACE 252 select HAVE_RSEQ 253 select HAVE_SETUP_PER_CPU_AREA if PPC64 254 select HAVE_SOFTIRQ_ON_OWN_STACK 255 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2) 256 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13) 257 select HAVE_STATIC_CALL if PPC32 258 select HAVE_SYSCALL_TRACEPOINTS 259 select HAVE_VIRT_CPU_ACCOUNTING 260 select HAVE_VIRT_CPU_ACCOUNTING_GEN 261 select HUGETLB_PAGE_SIZE_VARIABLE if PPC_BOOK3S_64 && HUGETLB_PAGE 262 select IOMMU_HELPER if PPC64 263 select IRQ_DOMAIN 264 select IRQ_FORCED_THREADING 265 select KASAN_VMALLOC if KASAN && MODULES 266 select MMU_GATHER_PAGE_SIZE 267 select MMU_GATHER_RCU_TABLE_FREE 268 select MMU_GATHER_MERGE_VMAS 269 select MMU_LAZY_TLB_SHOOTDOWN if PPC_BOOK3S_64 270 select MODULES_USE_ELF_RELA 271 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE 272 select NEED_PER_CPU_EMBED_FIRST_CHUNK if PPC64 273 select NEED_PER_CPU_PAGE_FIRST_CHUNK if PPC64 274 select NEED_SG_DMA_LENGTH 275 select OF 276 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE 277 select OF_EARLY_FLATTREE 278 select OLD_SIGACTION if PPC32 279 select OLD_SIGSUSPEND 280 select PCI_DOMAINS if PCI 281 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI 282 select PCI_SYSCALL if PCI 283 select PPC_DAWR if PPC64 284 select RTC_LIB 285 select SPARSE_IRQ 286 select STRICT_KERNEL_RWX if STRICT_MODULE_RWX 287 select SYSCTL_EXCEPTION_TRACE 288 select THREAD_INFO_IN_TASK 289 select TRACE_IRQFLAGS_SUPPORT 290 # 291 # Please keep this list sorted alphabetically. 292 # 293 294config PPC_LONG_DOUBLE_128 295 depends on PPC64 && ALTIVEC 296 def_bool $(success,test "$(shell,echo __LONG_DOUBLE_128__ | $(CC) -E -P -)" = 1) 297 298config PPC_BARRIER_NOSPEC 299 bool 300 default y 301 depends on PPC_BOOK3S_64 || PPC_E500 302 303config PPC_HAS_LBARX_LHARX 304 bool 305 306config EARLY_PRINTK 307 bool 308 default y 309 310config PANIC_TIMEOUT 311 int 312 default 180 313 314config COMPAT 315 bool "Enable support for 32bit binaries" 316 depends on PPC64 317 depends on !CC_IS_CLANG || CLANG_VERSION >= 120000 318 default y if !CPU_LITTLE_ENDIAN 319 select ARCH_WANT_OLD_COMPAT_IPC 320 select COMPAT_OLD_SIGACTION 321 322config SCHED_OMIT_FRAME_POINTER 323 bool 324 default y 325 326config ARCH_MAY_HAVE_PC_FDC 327 bool 328 default PCI 329 330config PPC_UDBG_16550 331 bool 332 333config GENERIC_TBSYNC 334 bool 335 default y if PPC32 && SMP 336 337config AUDIT_ARCH 338 bool 339 default y 340 341config GENERIC_BUG 342 bool 343 default y 344 depends on BUG 345 346config GENERIC_BUG_RELATIVE_POINTERS 347 def_bool y 348 depends on GENERIC_BUG 349 350config SYS_SUPPORTS_APM_EMULATION 351 default y if PMAC_APM_EMU 352 bool 353 354config EPAPR_BOOT 355 bool 356 help 357 Used to allow a board to specify it wants an ePAPR compliant wrapper. 358 359config DEFAULT_UIMAGE 360 bool 361 help 362 Used to allow a board to specify it wants a uImage built by default 363 364config ARCH_HIBERNATION_POSSIBLE 365 bool 366 default y 367 368config ARCH_SUSPEND_POSSIBLE 369 def_bool y 370 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \ 371 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \ 372 || 44x || 40x 373 374config ARCH_SUSPEND_NONZERO_CPU 375 def_bool y 376 depends on PPC_POWERNV || PPC_PSERIES 377 378config ARCH_HAS_ADD_PAGES 379 def_bool y 380 depends on ARCH_ENABLE_MEMORY_HOTPLUG 381 382config PPC_DCR_NATIVE 383 bool 384 385config PPC_DCR_MMIO 386 bool 387 388config PPC_DCR 389 bool 390 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO 391 default y 392 393config PPC_PCI_OF_BUS_MAP 394 bool "Use pci_to_OF_bus_map (deprecated)" 395 depends on PPC32 396 depends on PPC_PMAC || PPC_CHRP 397 help 398 This option uses pci_to_OF_bus_map to map OF nodes to PCI devices, which 399 restricts the system to only having 256 PCI buses. On CHRP it also causes 400 the "pci-OF-bus-map" property to be created in the device tree. 401 402 If unsure, say "N". 403 404config PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT 405 depends on PPC32 406 depends on !PPC_PCI_OF_BUS_MAP 407 bool "Assign PCI bus numbers from zero individually for each PCI domain" 408 default y 409 help 410 By default on PPC32 were PCI bus numbers unique across all PCI domains. 411 So system could have only 256 PCI buses independently of available 412 PCI domains. When this option is enabled then PCI bus numbers are 413 PCI domain dependent and each PCI controller on own domain can have 414 256 PCI buses, like it is on other Linux architectures. 415 416config PPC_OF_PLATFORM_PCI 417 bool 418 depends on PCI 419 depends on PPC64 # not supported on 32 bits yet 420 421config ARCH_SUPPORTS_UPROBES 422 def_bool y 423 424config PPC_ADV_DEBUG_REGS 425 bool 426 depends on 40x || BOOKE 427 default y 428 429config PPC_ADV_DEBUG_IACS 430 int 431 depends on PPC_ADV_DEBUG_REGS 432 default 4 if 44x 433 default 2 434 435config PPC_ADV_DEBUG_DACS 436 int 437 depends on PPC_ADV_DEBUG_REGS 438 default 2 439 440config PPC_ADV_DEBUG_DVCS 441 int 442 depends on PPC_ADV_DEBUG_REGS 443 default 2 if 44x 444 default 0 445 446config PPC_ADV_DEBUG_DAC_RANGE 447 bool 448 depends on PPC_ADV_DEBUG_REGS && 44x 449 default y 450 451config PPC_DAWR 452 bool 453 454config PGTABLE_LEVELS 455 int 456 default 2 if !PPC64 457 default 4 458 459source "arch/powerpc/sysdev/Kconfig" 460source "arch/powerpc/platforms/Kconfig" 461 462menu "Kernel options" 463 464config HIGHMEM 465 bool "High memory support" 466 depends on PPC32 467 select KMAP_LOCAL 468 469source "kernel/Kconfig.hz" 470 471config MATH_EMULATION 472 bool "Math emulation" 473 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT 474 select PPC_FPU_REGS 475 help 476 Some PowerPC chips designed for embedded applications do not have 477 a floating-point unit and therefore do not implement the 478 floating-point instructions in the PowerPC instruction set. If you 479 say Y here, the kernel will include code to emulate a floating-point 480 unit, which will allow programs that use floating-point 481 instructions to run. 482 483 This is also useful to emulate missing (optional) instructions 484 such as fsqrt on cores that do have an FPU but do not implement 485 them (such as Freescale BookE). 486 487choice 488 prompt "Math emulation options" 489 default MATH_EMULATION_FULL 490 depends on MATH_EMULATION 491 492config MATH_EMULATION_FULL 493 bool "Emulate all the floating point instructions" 494 help 495 Select this option will enable the kernel to support to emulate 496 all the floating point instructions. If your SoC doesn't have 497 a FPU, you should select this. 498 499config MATH_EMULATION_HW_UNIMPLEMENTED 500 bool "Just emulate the FPU unimplemented instructions" 501 help 502 Select this if you know there does have a hardware FPU on your 503 SoC, but some floating point instructions are not implemented by that. 504 505endchoice 506 507config PPC_TRANSACTIONAL_MEM 508 bool "Transactional Memory support for POWERPC" 509 depends on PPC_BOOK3S_64 510 depends on SMP 511 select ALTIVEC 512 select VSX 513 help 514 Support user-mode Transactional Memory on POWERPC. 515 516config PPC_UV 517 bool "Ultravisor support" 518 depends on KVM_BOOK3S_HV_POSSIBLE 519 depends on DEVICE_PRIVATE 520 default n 521 help 522 This option paravirtualizes the kernel to run in POWER platforms that 523 supports the Protected Execution Facility (PEF). On such platforms, 524 the ultravisor firmware runs at a privilege level above the 525 hypervisor. 526 527 If unsure, say "N". 528 529config LD_HEAD_STUB_CATCH 530 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT 531 depends on PPC64 532 help 533 Very large kernels can cause linker branch stubs to be generated by 534 code in head_64.S, which moves the head text sections out of their 535 specified location. This option can work around the problem. 536 537 If unsure, say "N". 538 539config MPROFILE_KERNEL 540 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER 541 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__) 542 543config HOTPLUG_CPU 544 bool "Support for enabling/disabling CPUs" 545 depends on SMP && (PPC_PSERIES || \ 546 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE) 547 help 548 Say Y here to be able to disable and re-enable individual 549 CPUs at runtime on SMP machines. 550 551 Say N if you are unsure. 552 553config INTERRUPT_SANITIZE_REGISTERS 554 bool "Clear gprs on interrupt arrival" 555 depends on PPC64 && ARCH_HAS_SYSCALL_WRAPPER 556 default PPC_BOOK3E_64 || PPC_PSERIES || PPC_POWERNV 557 help 558 Reduce the influence of user register state on interrupt handlers and 559 syscalls through clearing user state from registers before handling 560 the exception. 561 562config PPC_QUEUED_SPINLOCKS 563 bool "Queued spinlocks" if EXPERT 564 depends on SMP 565 default PPC_BOOK3S_64 566 help 567 Say Y here to use queued spinlocks which give better scalability and 568 fairness on large SMP and NUMA systems without harming single threaded 569 performance. 570 571config ARCH_CPU_PROBE_RELEASE 572 def_bool y 573 depends on HOTPLUG_CPU 574 575config PPC64_SUPPORTS_MEMORY_FAILURE 576 bool "Add support for memory hwpoison" 577 depends on PPC_BOOK3S_64 578 default "y" if PPC_POWERNV 579 select ARCH_SUPPORTS_MEMORY_FAILURE 580 581config KEXEC 582 bool "kexec system call" 583 depends on PPC_BOOK3S || PPC_E500 || (44x && !SMP) 584 select KEXEC_CORE 585 help 586 kexec is a system call that implements the ability to shutdown your 587 current kernel, and to start another kernel. It is like a reboot 588 but it is independent of the system firmware. And like a reboot 589 you can start any kernel with it, not just Linux. 590 591 The name comes from the similarity to the exec system call. 592 593 It is an ongoing process to be certain the hardware in a machine 594 is properly shutdown, so do not be surprised if this code does not 595 initially work for you. As of this writing the exact hardware 596 interface is strongly in flux, so no good recommendation can be 597 made. 598 599config KEXEC_FILE 600 bool "kexec file based system call" 601 select KEXEC_CORE 602 select HAVE_IMA_KEXEC if IMA 603 select KEXEC_ELF 604 depends on PPC64 605 depends on CRYPTO=y 606 depends on CRYPTO_SHA256=y 607 help 608 This is a new version of the kexec system call. This call is 609 file based and takes in file descriptors as system call arguments 610 for kernel and initramfs as opposed to a list of segments as is the 611 case for the older kexec call. 612 613config ARCH_HAS_KEXEC_PURGATORY 614 def_bool KEXEC_FILE 615 616config PPC64_BIG_ENDIAN_ELF_ABI_V2 617 bool "Build big-endian kernel using ELF ABI V2 (EXPERIMENTAL)" 618 depends on PPC64 && CPU_BIG_ENDIAN 619 depends on CC_HAS_ELFV2 620 depends on LD_IS_BFD && LD_VERSION >= 22400 621 default n 622 help 623 This builds the kernel image using the "Power Architecture 64-Bit ELF 624 V2 ABI Specification", which has a reduced stack overhead and faster 625 function calls. This internal kernel ABI option does not affect 626 userspace compatibility. 627 628 The V2 ABI is standard for 64-bit little-endian, but for big-endian 629 it is less well tested by kernel and toolchain. However some distros 630 build userspace this way, and it can produce a functioning kernel. 631 632 This requires GCC and binutils 2.24 or newer. 633 634config RELOCATABLE 635 bool "Build a relocatable kernel" 636 depends on PPC64 || (FLATMEM && (44x || PPC_85xx)) 637 select NONSTATIC_KERNEL 638 help 639 This builds a kernel image that is capable of running at the 640 location the kernel is loaded at. For ppc32, there is no any 641 alignment restrictions, and this feature is a superset of 642 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use 643 16k-aligned base address. The kernel is linked as a 644 position-independent executable (PIE) and contains dynamic relocations 645 which are processed early in the bootup process. 646 647 One use is for the kexec on panic case where the recovery kernel 648 must live at a different physical address than the primary 649 kernel. 650 651 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address 652 it has been loaded at and the compile time physical addresses 653 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START 654 setting can still be useful to bootwrappers that need to know the 655 load address of the kernel (eg. u-boot/mkimage). 656 657config RANDOMIZE_BASE 658 bool "Randomize the address of the kernel image" 659 depends on PPC_85xx && FLATMEM 660 depends on RELOCATABLE 661 help 662 Randomizes the virtual address at which the kernel image is 663 loaded, as a security feature that deters exploit attempts 664 relying on knowledge of the location of kernel internals. 665 666 If unsure, say Y. 667 668config RELOCATABLE_TEST 669 bool "Test relocatable kernel" 670 depends on (PPC64 && RELOCATABLE) 671 help 672 This runs the relocatable kernel at the address it was initially 673 loaded at, which tends to be non-zero and therefore test the 674 relocation code. 675 676config CRASH_DUMP 677 bool "Build a dump capture kernel" 678 depends on PPC64 || PPC_BOOK3S_32 || PPC_85xx || (44x && !SMP) 679 select RELOCATABLE if PPC64 || 44x || PPC_85xx 680 help 681 Build a kernel suitable for use as a dump capture kernel. 682 The same kernel binary can be used as production kernel and dump 683 capture kernel. 684 685config FA_DUMP 686 bool "Firmware-assisted dump" 687 depends on PPC64 && (PPC_RTAS || PPC_POWERNV) 688 select CRASH_CORE 689 select CRASH_DUMP 690 help 691 A robust mechanism to get reliable kernel crash dump with 692 assistance from firmware. This approach does not use kexec, 693 instead firmware assists in booting the capture kernel 694 while preserving memory contents. Firmware-assisted dump 695 is meant to be a kdump replacement offering robustness and 696 speed not possible without system firmware assistance. 697 698 If unsure, say "y". Only special kernels like petitboot may 699 need to say "N" here. 700 701config PRESERVE_FA_DUMP 702 bool "Preserve Firmware-assisted dump" 703 depends on PPC64 && PPC_POWERNV && !FA_DUMP 704 help 705 On a kernel with FA_DUMP disabled, this option helps to preserve 706 crash data from a previously crash'ed kernel. Useful when the next 707 memory preserving kernel boot would process this crash data. 708 Petitboot kernel is the typical usecase for this option. 709 710config OPAL_CORE 711 bool "Export OPAL memory as /sys/firmware/opal/core" 712 depends on PPC64 && PPC_POWERNV 713 help 714 This option uses the MPIPL support in firmware to provide an 715 ELF core of OPAL memory after a crash. The ELF core is exported 716 as /sys/firmware/opal/core file which is helpful in debugging 717 OPAL crashes using GDB. 718 719config IRQ_ALL_CPUS 720 bool "Distribute interrupts on all CPUs by default" 721 depends on SMP 722 help 723 This option gives the kernel permission to distribute IRQs across 724 multiple CPUs. Saying N here will route all IRQs to the first 725 CPU. Generally saying Y is safe, although some problems have been 726 reported with SMP Power Macintoshes with this option enabled. 727 728config NUMA 729 bool "NUMA Memory Allocation and Scheduler Support" 730 depends on PPC64 && SMP 731 default y if PPC_PSERIES || PPC_POWERNV 732 select USE_PERCPU_NUMA_NODE_ID 733 help 734 Enable NUMA (Non-Uniform Memory Access) support. 735 736 The kernel will try to allocate memory used by a CPU on the 737 local memory controller of the CPU and add some more 738 NUMA awareness to the kernel. 739 740config NODES_SHIFT 741 int 742 default "8" if PPC64 743 default "4" 744 depends on NUMA 745 746config HAVE_MEMORYLESS_NODES 747 def_bool y 748 depends on NUMA 749 750config ARCH_SELECT_MEMORY_MODEL 751 def_bool y 752 depends on PPC64 753 754config ARCH_FLATMEM_ENABLE 755 def_bool y 756 depends on (PPC64 && !NUMA) || PPC32 757 758config ARCH_SPARSEMEM_ENABLE 759 def_bool y 760 depends on PPC64 761 select SPARSEMEM_VMEMMAP_ENABLE 762 763config ARCH_SPARSEMEM_DEFAULT 764 def_bool y 765 depends on PPC_BOOK3S_64 766 767config ILLEGAL_POINTER_VALUE 768 hex 769 # This is roughly half way between the top of user space and the bottom 770 # of kernel space, which seems about as good as we can get. 771 default 0x5deadbeef0000000 if PPC64 772 default 0 773 774config ARCH_MEMORY_PROBE 775 def_bool y 776 depends on MEMORY_HOTPLUG 777 778choice 779 prompt "Page size" 780 default PPC_64K_PAGES if PPC_BOOK3S_64 781 default PPC_4K_PAGES 782 help 783 Select the kernel logical page size. Increasing the page size 784 will reduce software overhead at each page boundary, allow 785 hardware prefetch mechanisms to be more effective, and allow 786 larger dma transfers increasing IO efficiency and reducing 787 overhead. However the utilization of memory will increase. 788 For example, each cached file will using a multiple of the 789 page size to hold its contents and the difference between the 790 end of file and the end of page is wasted. 791 792 Some dedicated systems, such as software raid serving with 793 accelerated calculations, have shown significant increases. 794 795 If you configure a 64 bit kernel for 64k pages but the 796 processor does not support them, then the kernel will simulate 797 them with 4k pages, loading them on demand, but with the 798 reduced software overhead and larger internal fragmentation. 799 For the 32 bit kernel, a large page option will not be offered 800 unless it is supported by the configured processor. 801 802 If unsure, choose 4K_PAGES. 803 804config PPC_4K_PAGES 805 bool "4k page size" 806 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 807 808config PPC_16K_PAGES 809 bool "16k page size" 810 depends on 44x || PPC_8xx 811 812config PPC_64K_PAGES 813 bool "64k page size" 814 depends on 44x || PPC_BOOK3S_64 815 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 816 817config PPC_256K_PAGES 818 bool "256k page size (Requires non-standard binutils settings)" 819 depends on 44x && !PPC_47x 820 help 821 Make the page size 256k. 822 823 The kernel will only be able to run applications that have been 824 compiled with '-zmax-page-size' set to 256K (the default is 64K) using 825 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE 826 definition from 0x10000 to 0x40000 in older versions. 827 828endchoice 829 830config PAGE_SIZE_4KB 831 def_bool y 832 depends on PPC_4K_PAGES 833 834config PAGE_SIZE_16KB 835 def_bool y 836 depends on PPC_16K_PAGES 837 838config PAGE_SIZE_64KB 839 def_bool y 840 depends on PPC_64K_PAGES 841 842config PAGE_SIZE_256KB 843 def_bool y 844 depends on PPC_256K_PAGES 845 846config PPC_PAGE_SHIFT 847 int 848 default 18 if PPC_256K_PAGES 849 default 16 if PPC_64K_PAGES 850 default 14 if PPC_16K_PAGES 851 default 12 852 853config THREAD_SHIFT 854 int "Thread shift" if EXPERT 855 range 13 15 856 default "15" if PPC_256K_PAGES 857 default "14" if PPC64 858 default "13" 859 help 860 Used to define the stack size. The default is almost always what you 861 want. Only change this if you know what you are doing. 862 863config DATA_SHIFT_BOOL 864 bool "Set custom data alignment" 865 depends on ADVANCED_OPTIONS 866 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE 867 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX) || \ 868 PPC_85xx 869 help 870 This option allows you to set the kernel data alignment. When 871 RAM is mapped by blocks, the alignment needs to fit the size and 872 number of possible blocks. The default should be OK for most configs. 873 874 Say N here unless you know what you are doing. 875 876config DATA_SHIFT 877 int "Data shift" if DATA_SHIFT_BOOL 878 default 24 if STRICT_KERNEL_RWX && PPC64 879 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32 880 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx 881 range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_85xx 882 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32 883 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32 884 default 23 if STRICT_KERNEL_RWX && PPC_8xx 885 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA 886 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx 887 default 24 if STRICT_KERNEL_RWX && PPC_85xx 888 default PPC_PAGE_SHIFT 889 help 890 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO. 891 Smaller is the alignment, greater is the number of necessary DBATs. 892 893 On 8xx, large pages (512kb or 8M) are used to map kernel linear 894 memory. Aligning to 8M reduces TLB misses as only 8M pages are used 895 in that case. If PIN_TLB is selected, it must be aligned to 8M as 896 8M pages will be pinned. 897 898config ARCH_FORCE_MAX_ORDER 899 int "Order of maximal physically contiguous allocations" 900 default "8" if PPC64 && PPC_64K_PAGES 901 default "12" if PPC64 && !PPC_64K_PAGES 902 default "8" if PPC32 && PPC_16K_PAGES 903 default "6" if PPC32 && PPC_64K_PAGES 904 default "4" if PPC32 && PPC_256K_PAGES 905 default "10" 906 help 907 The kernel page allocator limits the size of maximal physically 908 contiguous allocations. The limit is called MAX_ORDER and it 909 defines the maximal power of two of number of pages that can be 910 allocated as a single contiguous block. This option allows 911 overriding the default setting when ability to allocate very 912 large blocks of physically contiguous memory is required. 913 914 The page size is not necessarily 4KB. For example, on 64-bit 915 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep 916 this in mind when choosing a value for this option. 917 918 Don't change if unsure. 919 920config PPC_SUBPAGE_PROT 921 bool "Support setting protections for 4k subpages (subpage_prot syscall)" 922 default n 923 depends on PPC_64S_HASH_MMU && PPC_64K_PAGES 924 help 925 This option adds support for system call to allow user programs 926 to set access permissions (read/write, readonly, or no access) 927 on the 4k subpages of each 64k page. 928 929 If unsure, say N here. 930 931config PPC_PROT_SAO_LPAR 932 bool "Support PROT_SAO mappings in LPARs" 933 depends on PPC_BOOK3S_64 934 help 935 This option adds support for PROT_SAO mappings from userspace 936 inside LPARs on supported CPUs. 937 938 This may cause issues when performing guest migration from 939 a CPU that supports SAO to one that does not. 940 941 If unsure, say N here. 942 943config PPC_COPRO_BASE 944 bool 945 946config SCHED_SMT 947 bool "SMT (Hyperthreading) scheduler support" 948 depends on PPC64 && SMP 949 help 950 SMT scheduler support improves the CPU scheduler's decision making 951 when dealing with POWER5 cpus at a cost of slightly increased 952 overhead in some places. If unsure say N here. 953 954config PPC_DENORMALISATION 955 bool "PowerPC denormalisation exception handling" 956 depends on PPC_BOOK3S_64 957 default "y" if PPC_POWERNV 958 help 959 Add support for handling denormalisation of single precision 960 values. Useful for bare metal only. If unsure say Y here. 961 962config CMDLINE 963 string "Initial kernel command string" 964 default "" 965 help 966 On some platforms, there is currently no way for the boot loader to 967 pass arguments to the kernel. For these platforms, you can supply 968 some command-line options at build time by entering them here. In 969 most cases you will need to specify the root device here. 970 971choice 972 prompt "Kernel command line type" if CMDLINE != "" 973 default CMDLINE_FROM_BOOTLOADER 974 975config CMDLINE_FROM_BOOTLOADER 976 bool "Use bootloader kernel arguments if available" 977 help 978 Uses the command-line options passed by the boot loader. If 979 the boot loader doesn't provide any, the default kernel command 980 string provided in CMDLINE will be used. 981 982config CMDLINE_EXTEND 983 bool "Extend bootloader kernel arguments" 984 help 985 The command-line arguments provided by the boot loader will be 986 appended to the default kernel command string. 987 988config CMDLINE_FORCE 989 bool "Always use the default kernel command string" 990 help 991 Always use the default kernel command string, even if the boot 992 loader passes other arguments to the kernel. 993 This is useful if you cannot or don't want to change the 994 command-line options your boot loader passes to the kernel. 995 996endchoice 997 998config EXTRA_TARGETS 999 string "Additional default image types" 1000 help 1001 List additional targets to be built by the bootwrapper here (separated 1002 by spaces). This is useful for targets that depend of device tree 1003 files in the .dts directory. 1004 1005 Targets in this list will be build as part of the default build 1006 target, or when the user does a 'make zImage' or a 1007 'make zImage.initrd'. 1008 1009 If unsure, leave blank 1010 1011config ARCH_WANTS_FREEZER_CONTROL 1012 def_bool y 1013 depends on ADB_PMU 1014 1015source "kernel/power/Kconfig" 1016 1017config PPC_MEM_KEYS 1018 prompt "PowerPC Memory Protection Keys" 1019 def_bool y 1020 depends on PPC_BOOK3S_64 1021 depends on PPC_64S_HASH_MMU 1022 select ARCH_USES_HIGH_VMA_FLAGS 1023 select ARCH_HAS_PKEYS 1024 help 1025 Memory Protection Keys provides a mechanism for enforcing 1026 page-based protections, but without requiring modification of the 1027 page tables when an application changes protection domains. 1028 1029 For details, see Documentation/core-api/protection-keys.rst 1030 1031 If unsure, say y. 1032 1033config PPC_SECURE_BOOT 1034 prompt "Enable secure boot support" 1035 bool 1036 depends on PPC_POWERNV || PPC_PSERIES 1037 depends on IMA_ARCH_POLICY 1038 imply IMA_SECURE_AND_OR_TRUSTED_BOOT 1039 select PSERIES_PLPKS if PPC_PSERIES 1040 help 1041 Systems with firmware secure boot enabled need to define security 1042 policies to extend secure boot to the OS. This config allows a user 1043 to enable OS secure boot on systems that have firmware support for 1044 it. If in doubt say N. 1045 1046config PPC_SECVAR_SYSFS 1047 bool "Enable sysfs interface for POWER secure variables" 1048 default y 1049 depends on PPC_SECURE_BOOT 1050 depends on SYSFS 1051 help 1052 POWER secure variables are managed and controlled by firmware. 1053 These variables are exposed to userspace via sysfs to enable 1054 read/write operations on these variables. Say Y if you have 1055 secure boot enabled and want to expose variables to userspace. 1056 1057endmenu 1058 1059config ISA_DMA_API 1060 bool 1061 default PCI 1062 1063menu "Bus options" 1064 1065config ISA 1066 bool "Support for ISA-bus hardware" 1067 depends on PPC_CHRP 1068 select PPC_I8259 1069 help 1070 Find out whether you have ISA slots on your motherboard. ISA is the 1071 name of a bus system, i.e. the way the CPU talks to the other stuff 1072 inside your box. If you have an Apple machine, say N here; if you 1073 have an IBM RS/6000 or pSeries machine, say Y. If you have an 1074 embedded board, consult your board documentation. 1075 1076config GENERIC_ISA_DMA 1077 bool 1078 depends on ISA_DMA_API 1079 default y 1080 1081config PPC_INDIRECT_PCI 1082 bool 1083 depends on PCI 1084 default y if 40x || 44x 1085 1086config SBUS 1087 bool 1088 1089config FSL_SOC 1090 bool 1091 1092config FSL_PCI 1093 bool 1094 select ARCH_HAS_DMA_SET_MASK 1095 select PPC_INDIRECT_PCI 1096 select PCI_QUIRKS 1097 1098config FSL_PMC 1099 bool 1100 default y 1101 depends on SUSPEND && (PPC_85xx || PPC_86xx) 1102 help 1103 Freescale MPC85xx/MPC86xx power management controller support 1104 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c 1105 1106config PPC4xx_CPM 1107 bool 1108 default y 1109 depends on SUSPEND && (44x || 40x) 1110 help 1111 PPC4xx Clock Power Management (CPM) support (suspend/resume). 1112 It also enables support for two different idle states (idle-wait 1113 and idle-doze). 1114 1115config 4xx_SOC 1116 bool 1117 1118config FSL_LBC 1119 bool "Freescale Local Bus support" 1120 help 1121 Enables reporting of errors from the Freescale local bus 1122 controller. Also contains some common code used by 1123 drivers for specific local bus peripherals. 1124 1125config FSL_GTM 1126 bool 1127 depends on PPC_83xx || QUICC_ENGINE || CPM2 1128 help 1129 Freescale General-purpose Timers support 1130 1131config PCI_8260 1132 bool 1133 depends on PCI && 8260 1134 select PPC_INDIRECT_PCI 1135 default y 1136 1137config FSL_RIO 1138 bool "Freescale Embedded SRIO Controller support" 1139 depends on RAPIDIO = y && HAVE_RAPIDIO 1140 default "n" 1141 help 1142 Include support for RapidIO controller on Freescale embedded 1143 processors (MPC8548, MPC8641, etc). 1144 1145endmenu 1146 1147config NONSTATIC_KERNEL 1148 bool 1149 1150menu "Advanced setup" 1151 depends on PPC32 1152 1153config ADVANCED_OPTIONS 1154 bool "Prompt for advanced kernel configuration options" 1155 help 1156 This option will enable prompting for a variety of advanced kernel 1157 configuration options. These options can cause the kernel to not 1158 work if they are set incorrectly, but can be used to optimize certain 1159 aspects of kernel memory management. 1160 1161 Unless you know what you are doing, say N here. 1162 1163comment "Default settings for advanced configuration options are used" 1164 depends on !ADVANCED_OPTIONS 1165 1166config LOWMEM_SIZE_BOOL 1167 bool "Set maximum low memory" 1168 depends on ADVANCED_OPTIONS 1169 help 1170 This option allows you to set the maximum amount of memory which 1171 will be used as "low memory", that is, memory which the kernel can 1172 access directly, without having to set up a kernel virtual mapping. 1173 This can be useful in optimizing the layout of kernel virtual 1174 memory. 1175 1176 Say N here unless you know what you are doing. 1177 1178config LOWMEM_SIZE 1179 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL 1180 default "0x30000000" 1181 1182config LOWMEM_CAM_NUM_BOOL 1183 bool "Set number of CAMs to use to map low memory" 1184 depends on ADVANCED_OPTIONS && PPC_85xx 1185 help 1186 This option allows you to set the maximum number of CAM slots that 1187 will be used to map low memory. There are a limited number of slots 1188 available and even more limited number that will fit in the L1 MMU. 1189 However, using more entries will allow mapping more low memory. This 1190 can be useful in optimizing the layout of kernel virtual memory. 1191 1192 Say N here unless you know what you are doing. 1193 1194config LOWMEM_CAM_NUM 1195 depends on PPC_85xx 1196 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL 1197 default 3 if !STRICT_KERNEL_RWX 1198 default 9 if DATA_SHIFT >= 24 1199 default 12 if DATA_SHIFT >= 22 1200 default 15 1201 1202config DYNAMIC_MEMSTART 1203 bool "Enable page aligned dynamic load address for kernel" 1204 depends on ADVANCED_OPTIONS && FLATMEM && (PPC_85xx || 44x) 1205 select NONSTATIC_KERNEL 1206 help 1207 This option enables the kernel to be loaded at any page aligned 1208 physical address. The kernel creates a mapping from KERNELBASE to 1209 the address where the kernel is loaded. The page size here implies 1210 the TLB page size of the mapping for kernel on the particular platform. 1211 Please refer to the init code for finding the TLB page size. 1212 1213 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE 1214 kernel image, where the only restriction is the page aligned kernel 1215 load address. When this option is enabled, the compile time physical 1216 address CONFIG_PHYSICAL_START is ignored. 1217 1218 This option is overridden by CONFIG_RELOCATABLE 1219 1220config PAGE_OFFSET_BOOL 1221 bool "Set custom page offset address" 1222 depends on ADVANCED_OPTIONS 1223 help 1224 This option allows you to set the kernel virtual address at which 1225 the kernel will map low memory. This can be useful in optimizing 1226 the virtual memory layout of the system. 1227 1228 Say N here unless you know what you are doing. 1229 1230config PAGE_OFFSET 1231 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL 1232 default "0xc0000000" 1233 1234config KERNEL_START_BOOL 1235 bool "Set custom kernel base address" 1236 depends on ADVANCED_OPTIONS 1237 help 1238 This option allows you to set the kernel virtual address at which 1239 the kernel will be loaded. Normally this should match PAGE_OFFSET 1240 however there are times (like kdump) that one might not want them 1241 to be the same. 1242 1243 Say N here unless you know what you are doing. 1244 1245config KERNEL_START 1246 hex "Virtual address of kernel base" if KERNEL_START_BOOL 1247 default PAGE_OFFSET if PAGE_OFFSET_BOOL 1248 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL 1249 default "0xc0000000" 1250 1251config PHYSICAL_START_BOOL 1252 bool "Set physical address where the kernel is loaded" 1253 depends on ADVANCED_OPTIONS && FLATMEM && PPC_85xx 1254 help 1255 This gives the physical address where the kernel is loaded. 1256 1257 Say N here unless you know what you are doing. 1258 1259config PHYSICAL_START 1260 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL 1261 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL 1262 default "0x00000000" 1263 1264config PHYSICAL_ALIGN 1265 hex 1266 default "0x04000000" if PPC_85xx 1267 help 1268 This value puts the alignment restrictions on physical address 1269 where kernel is loaded and run from. Kernel is compiled for an 1270 address which meets above alignment restriction. 1271 1272config TASK_SIZE_BOOL 1273 bool "Set custom user task size" 1274 depends on ADVANCED_OPTIONS 1275 help 1276 This option allows you to set the amount of virtual address space 1277 allocated to user tasks. This can be useful in optimizing the 1278 virtual memory layout of the system. 1279 1280 Say N here unless you know what you are doing. 1281 1282config TASK_SIZE 1283 hex "Size of user task space" if TASK_SIZE_BOOL 1284 default "0x80000000" if PPC_8xx 1285 default "0xb0000000" if PPC_BOOK3S_32 1286 default "0xc0000000" 1287endmenu 1288 1289if PPC64 1290# This value must have zeroes in the bottom 60 bits otherwise lots will break 1291config PAGE_OFFSET 1292 hex 1293 default "0xc000000000000000" 1294config KERNEL_START 1295 hex 1296 default "0xc000000000000000" 1297config PHYSICAL_START 1298 hex 1299 default "0x00000000" 1300endif 1301 1302config PPC_LIB_RHEAP 1303 bool 1304 1305source "arch/powerpc/kvm/Kconfig" 1306 1307source "kernel/livepatch/Kconfig" 1308