1 # SPDX-License-Identifier: GPL-2.0 2 source "arch/powerpc/platforms/Kconfig.cputype" 3 4 config CC_HAS_ELFV2 5 def_bool PPC64 && $(cc-option, -mabi=elfv2) 6 7 config CC_HAS_PREFIXED 8 def_bool PPC64 && $(cc-option, -mcpu=power10 -mprefixed) 9 10 config 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 18 config 32BIT 19 bool 20 default y if PPC32 21 22 config 64BIT 23 bool 24 default y if PPC64 25 26 config LIVEPATCH_64 27 def_bool PPC64 28 depends on LIVEPATCH 29 30 config MMU 31 bool 32 default y 33 34 config 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 52 config 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 60 config 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 68 config 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 76 config 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 86 config NMI_IPI 87 bool 88 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR) 89 default y 90 91 config 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. 100 101 config STACKTRACE_SUPPORT 102 bool 103 default y 104 105 config LOCKDEP_SUPPORT 106 bool 107 default y 108 109 config GENERIC_LOCKBREAK 110 bool 111 default y 112 depends on SMP && PREEMPTION && !PPC_QUEUED_SPINLOCKS 113 114 config GENERIC_HWEIGHT 115 bool 116 default y 117 118 config 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_DMA_OPS if PPC64 137 select ARCH_HAS_FORTIFY_SOURCE 138 select ARCH_HAS_GCOV_PROFILE_ALL 139 select ARCH_HAS_KCOV 140 select ARCH_HAS_KERNEL_FPU_SUPPORT if PPC64 && PPC_FPU 141 select ARCH_HAS_MEMBARRIER_CALLBACKS 142 select ARCH_HAS_MEMBARRIER_SYNC_CORE 143 select ARCH_HAS_MEMREMAP_COMPAT_ALIGN if PPC_64S_HASH_MMU 144 select ARCH_HAS_MMIOWB if PPC64 145 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE 146 select ARCH_HAS_PHYS_TO_DMA 147 select ARCH_HAS_PMEM_API 148 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64 149 select ARCH_HAS_PTE_SPECIAL 150 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64 151 select ARCH_HAS_SET_MEMORY 152 select ARCH_HAS_STRICT_KERNEL_RWX if (PPC_BOOK3S || PPC_8xx) && !HIBERNATION 153 select ARCH_HAS_STRICT_KERNEL_RWX if PPC_85xx && !HIBERNATION && !RANDOMIZE_BASE 154 select ARCH_HAS_STRICT_MODULE_RWX if ARCH_HAS_STRICT_KERNEL_RWX 155 select ARCH_HAS_SYSCALL_WRAPPER if !SPU_BASE && !COMPAT 156 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 157 select ARCH_HAS_UACCESS_FLUSHCACHE 158 select ARCH_HAS_UBSAN 159 select ARCH_HAVE_NMI_SAFE_CMPXCHG 160 select ARCH_HAVE_EXTRA_ELF_NOTES if SPU_BASE 161 select ARCH_KEEP_MEMBLOCK 162 select ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE if PPC_RADIX_MMU 163 select ARCH_MIGHT_HAVE_PC_PARPORT 164 select ARCH_MIGHT_HAVE_PC_SERIO 165 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX 166 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT 167 select ARCH_SPLIT_ARG64 if PPC32 168 select ARCH_STACKWALK 169 select ARCH_SUPPORTS_ATOMIC_RMW 170 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC_BOOK3S || PPC_8xx 171 select ARCH_USE_BUILTIN_BSWAP 172 select ARCH_USE_CMPXCHG_LOCKREF if PPC64 173 select ARCH_USE_MEMTEST 174 select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS 175 select ARCH_WANT_DEFAULT_BPF_JIT 176 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT 177 select ARCH_WANT_IPC_PARSE_VERSION 178 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM 179 select ARCH_WANT_LD_ORPHAN_WARN 180 select ARCH_WANT_OPTIMIZE_DAX_VMEMMAP if PPC_RADIX_MMU 181 select ARCH_WANTS_MODULES_DATA_IN_VMALLOC if PPC_BOOK3S_32 || PPC_8xx 182 select ARCH_WEAK_RELEASE_ACQUIRE 183 select BINFMT_ELF 184 select BUILDTIME_TABLE_SORT 185 select CLONE_BACKWARDS 186 select CPUMASK_OFFSTACK if NR_CPUS >= 8192 187 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN 188 select DMA_OPS_BYPASS if PPC64 189 select DYNAMIC_FTRACE if FUNCTION_TRACER 190 select EDAC_ATOMIC_SCRUB 191 select EDAC_SUPPORT 192 select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY if ARCH_USING_PATCHABLE_FUNCTION_ENTRY 193 select FUNCTION_ALIGNMENT_4B 194 select GENERIC_ATOMIC64 if PPC32 195 select GENERIC_CLOCKEVENTS_BROADCAST if SMP 196 select GENERIC_CMOS_UPDATE 197 select GENERIC_CPU_AUTOPROBE 198 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC 199 select GENERIC_EARLY_IOREMAP 200 select GENERIC_GETTIMEOFDAY 201 select GENERIC_IDLE_POLL_SETUP 202 select GENERIC_IOREMAP 203 select GENERIC_IRQ_SHOW 204 select GENERIC_IRQ_SHOW_LEVEL 205 select GENERIC_PCI_IOMAP if PCI 206 select GENERIC_PTDUMP 207 select GENERIC_SMP_IDLE_THREAD 208 select GENERIC_TIME_VSYSCALL 209 select GENERIC_VDSO_TIME_NS 210 select HAS_IOPORT if PCI 211 select HAVE_ARCH_AUDITSYSCALL 212 select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP 213 select HAVE_ARCH_HUGE_VMAP if PPC_RADIX_MMU || PPC_8xx 214 select HAVE_ARCH_JUMP_LABEL 215 select HAVE_ARCH_JUMP_LABEL_RELATIVE 216 select HAVE_ARCH_KASAN if PPC32 && PAGE_SHIFT <= 14 217 select HAVE_ARCH_KASAN if PPC_RADIX_MMU 218 select HAVE_ARCH_KASAN if PPC_BOOK3E_64 219 select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN 220 select HAVE_ARCH_KCSAN 221 select HAVE_ARCH_KFENCE if ARCH_SUPPORTS_DEBUG_PAGEALLOC 222 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET 223 select HAVE_ARCH_WITHIN_STACK_FRAMES 224 select HAVE_ARCH_KGDB 225 select HAVE_ARCH_MMAP_RND_BITS 226 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT 227 select HAVE_ARCH_NVRAM_OPS 228 select HAVE_ARCH_SECCOMP_FILTER 229 select HAVE_ARCH_TRACEHOOK 230 select HAVE_ASM_MODVERSIONS 231 select HAVE_CONTEXT_TRACKING_USER 232 select HAVE_C_RECORDMCOUNT 233 select HAVE_DEBUG_KMEMLEAK 234 select HAVE_DEBUG_STACKOVERFLOW 235 select HAVE_DYNAMIC_FTRACE 236 select HAVE_DYNAMIC_FTRACE_WITH_ARGS if ARCH_USING_PATCHABLE_FUNCTION_ENTRY || MPROFILE_KERNEL || PPC32 237 select HAVE_DYNAMIC_FTRACE_WITH_REGS if ARCH_USING_PATCHABLE_FUNCTION_ENTRY || MPROFILE_KERNEL || PPC32 238 select HAVE_EBPF_JIT 239 select HAVE_EFFICIENT_UNALIGNED_ACCESS 240 select HAVE_GUP_FAST 241 select HAVE_FTRACE_MCOUNT_RECORD 242 select HAVE_FUNCTION_ARG_ACCESS_API 243 select HAVE_FUNCTION_DESCRIPTORS if PPC64_ELF_ABI_V1 244 select HAVE_FUNCTION_ERROR_INJECTION 245 select HAVE_FUNCTION_GRAPH_TRACER 246 select HAVE_FUNCTION_TRACER if PPC64 || (PPC32 && CC_IS_GCC) 247 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC 248 select HAVE_GENERIC_VDSO 249 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC_BOOK3S_64 && SMP 250 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI 251 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx) 252 select HAVE_IOREMAP_PROT 253 select HAVE_IRQ_TIME_ACCOUNTING 254 select HAVE_KERNEL_GZIP 255 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE 256 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE 257 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x 258 select HAVE_KPROBES 259 select HAVE_KPROBES_ON_FTRACE 260 select HAVE_KRETPROBES 261 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if HAVE_OBJTOOL_MCOUNT && (!ARCH_USING_PATCHABLE_FUNCTION_ENTRY || (!CC_IS_GCC || GCC_VERSION >= 110100)) 262 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS 263 select HAVE_MOD_ARCH_SPECIFIC 264 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S) 265 select HAVE_OPTPROBES 266 select HAVE_OBJTOOL if ARCH_USING_PATCHABLE_FUNCTION_ENTRY || MPROFILE_KERNEL || PPC32 267 select HAVE_OBJTOOL_MCOUNT if HAVE_OBJTOOL 268 select HAVE_PERF_EVENTS 269 select HAVE_PERF_EVENTS_NMI if PPC64 270 select HAVE_PERF_REGS 271 select HAVE_PERF_USER_STACK_DUMP 272 select HAVE_RETHOOK if KPROBES 273 select HAVE_REGS_AND_STACK_ACCESS_API 274 select HAVE_RELIABLE_STACKTRACE 275 select HAVE_RSEQ 276 select HAVE_SETUP_PER_CPU_AREA if PPC64 277 select HAVE_SOFTIRQ_ON_OWN_STACK 278 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2) 279 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13) 280 select HAVE_STATIC_CALL if PPC32 281 select HAVE_SYSCALL_TRACEPOINTS 282 select HAVE_VIRT_CPU_ACCOUNTING 283 select HAVE_VIRT_CPU_ACCOUNTING_GEN 284 select HOTPLUG_SMT if HOTPLUG_CPU 285 select SMT_NUM_THREADS_DYNAMIC 286 select HUGETLB_PAGE_SIZE_VARIABLE if PPC_BOOK3S_64 && HUGETLB_PAGE 287 select IOMMU_HELPER if PPC64 288 select IRQ_DOMAIN 289 select IRQ_FORCED_THREADING 290 select KASAN_VMALLOC if KASAN && EXECMEM 291 select LOCK_MM_AND_FIND_VMA 292 select MMU_GATHER_PAGE_SIZE 293 select MMU_GATHER_RCU_TABLE_FREE 294 select MMU_GATHER_MERGE_VMAS 295 select MMU_LAZY_TLB_SHOOTDOWN if PPC_BOOK3S_64 296 select MODULES_USE_ELF_RELA 297 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE 298 select NEED_PER_CPU_EMBED_FIRST_CHUNK if PPC64 299 select NEED_PER_CPU_PAGE_FIRST_CHUNK if PPC64 300 select NEED_SG_DMA_LENGTH 301 select OF 302 select OF_EARLY_FLATTREE 303 select OLD_SIGACTION if PPC32 304 select OLD_SIGSUSPEND 305 select PCI_DOMAINS if PCI 306 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI 307 select PCI_SYSCALL if PCI 308 select PPC_DAWR if PPC64 309 select RTC_LIB 310 select SPARSE_IRQ 311 select STRICT_KERNEL_RWX if STRICT_MODULE_RWX 312 select SYSCTL_EXCEPTION_TRACE 313 select THREAD_INFO_IN_TASK 314 select TRACE_IRQFLAGS_SUPPORT 315 select VDSO_GETRANDOM 316 # 317 # Please keep this list sorted alphabetically. 318 # 319 320 config PPC_BARRIER_NOSPEC 321 bool 322 default y 323 depends on PPC_BOOK3S_64 || PPC_E500 324 325 config PPC_HAS_LBARX_LHARX 326 bool 327 328 config EARLY_PRINTK 329 bool 330 default y 331 332 config PANIC_TIMEOUT 333 int 334 default 180 335 336 config COMPAT 337 bool "Enable support for 32bit binaries" 338 depends on PPC64 339 default y if !CPU_LITTLE_ENDIAN 340 select ARCH_WANT_OLD_COMPAT_IPC 341 select COMPAT_OLD_SIGACTION 342 343 config SCHED_OMIT_FRAME_POINTER 344 bool 345 default y 346 347 config ARCH_MAY_HAVE_PC_FDC 348 bool 349 default PCI 350 351 config PPC_UDBG_16550 352 bool 353 354 config GENERIC_TBSYNC 355 bool 356 default y if PPC32 && SMP 357 358 config AUDIT_ARCH 359 bool 360 default y 361 362 config GENERIC_BUG 363 bool 364 default y 365 depends on BUG 366 367 config GENERIC_BUG_RELATIVE_POINTERS 368 def_bool y 369 depends on GENERIC_BUG 370 371 config SYS_SUPPORTS_APM_EMULATION 372 default y if PMAC_APM_EMU 373 bool 374 375 config EPAPR_BOOT 376 bool 377 help 378 Used to allow a board to specify it wants an ePAPR compliant wrapper. 379 380 config DEFAULT_UIMAGE 381 bool 382 help 383 Used to allow a board to specify it wants a uImage built by default 384 385 config ARCH_HIBERNATION_POSSIBLE 386 bool 387 default y 388 389 config ARCH_SUSPEND_POSSIBLE 390 def_bool y 391 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \ 392 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \ 393 || 44x 394 395 config ARCH_SUSPEND_NONZERO_CPU 396 def_bool y 397 depends on PPC_POWERNV || PPC_PSERIES 398 399 config ARCH_HAS_ADD_PAGES 400 def_bool y 401 depends on ARCH_ENABLE_MEMORY_HOTPLUG 402 403 config PPC_DCR_NATIVE 404 bool 405 406 config PPC_DCR_MMIO 407 bool 408 409 config PPC_DCR 410 bool 411 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO 412 default y 413 414 config PPC_PCI_OF_BUS_MAP 415 bool "Use pci_to_OF_bus_map (deprecated)" 416 depends on PPC32 417 depends on PPC_PMAC || PPC_CHRP 418 help 419 This option uses pci_to_OF_bus_map to map OF nodes to PCI devices, which 420 restricts the system to only having 256 PCI buses. On CHRP it also causes 421 the "pci-OF-bus-map" property to be created in the device tree. 422 423 If unsure, say "N". 424 425 config PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT 426 depends on PPC32 427 depends on !PPC_PCI_OF_BUS_MAP 428 bool "Assign PCI bus numbers from zero individually for each PCI domain" 429 default y 430 help 431 By default on PPC32 were PCI bus numbers unique across all PCI domains. 432 So system could have only 256 PCI buses independently of available 433 PCI domains. When this option is enabled then PCI bus numbers are 434 PCI domain dependent and each PCI controller on own domain can have 435 256 PCI buses, like it is on other Linux architectures. 436 437 config PPC_OF_PLATFORM_PCI 438 bool 439 depends on PCI 440 depends on PPC64 # not supported on 32 bits yet 441 442 config ARCH_SUPPORTS_UPROBES 443 def_bool y 444 445 config PPC_ADV_DEBUG_REGS 446 bool 447 depends on BOOKE 448 default y 449 450 config PPC_ADV_DEBUG_IACS 451 int 452 depends on PPC_ADV_DEBUG_REGS 453 default 4 if 44x 454 default 2 455 456 config PPC_ADV_DEBUG_DACS 457 int 458 depends on PPC_ADV_DEBUG_REGS 459 default 2 460 461 config PPC_ADV_DEBUG_DVCS 462 int 463 depends on PPC_ADV_DEBUG_REGS 464 default 2 if 44x 465 default 0 466 467 config PPC_ADV_DEBUG_DAC_RANGE 468 bool 469 depends on PPC_ADV_DEBUG_REGS && 44x 470 default y 471 472 config PPC_DAWR 473 bool 474 475 config PGTABLE_LEVELS 476 int 477 default 2 if !PPC64 478 default 4 479 480 source "arch/powerpc/sysdev/Kconfig" 481 source "arch/powerpc/platforms/Kconfig" 482 483 menu "Kernel options" 484 485 config HIGHMEM 486 bool "High memory support" 487 depends on PPC32 488 select KMAP_LOCAL 489 490 source "kernel/Kconfig.hz" 491 492 config MATH_EMULATION 493 bool "Math emulation" 494 depends on 44x || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT 495 select PPC_FPU_REGS 496 help 497 Some PowerPC chips designed for embedded applications do not have 498 a floating-point unit and therefore do not implement the 499 floating-point instructions in the PowerPC instruction set. If you 500 say Y here, the kernel will include code to emulate a floating-point 501 unit, which will allow programs that use floating-point 502 instructions to run. 503 504 This is also useful to emulate missing (optional) instructions 505 such as fsqrt on cores that do have an FPU but do not implement 506 them (such as Freescale BookE). 507 508 choice 509 prompt "Math emulation options" 510 default MATH_EMULATION_FULL 511 depends on MATH_EMULATION 512 513 config MATH_EMULATION_FULL 514 bool "Emulate all the floating point instructions" 515 help 516 Select this option will enable the kernel to support to emulate 517 all the floating point instructions. If your SoC doesn't have 518 a FPU, you should select this. 519 520 config MATH_EMULATION_HW_UNIMPLEMENTED 521 bool "Just emulate the FPU unimplemented instructions" 522 help 523 Select this if you know there does have a hardware FPU on your 524 SoC, but some floating point instructions are not implemented by that. 525 526 endchoice 527 528 config PPC_TRANSACTIONAL_MEM 529 bool "Transactional Memory support for POWERPC" 530 depends on PPC_BOOK3S_64 531 depends on SMP 532 select ALTIVEC 533 select VSX 534 help 535 Support user-mode Transactional Memory on POWERPC. 536 537 config PPC_UV 538 bool "Ultravisor support" 539 depends on KVM_BOOK3S_HV_POSSIBLE 540 depends on DEVICE_PRIVATE 541 default n 542 help 543 This option paravirtualizes the kernel to run in POWER platforms that 544 supports the Protected Execution Facility (PEF). On such platforms, 545 the ultravisor firmware runs at a privilege level above the 546 hypervisor. 547 548 If unsure, say "N". 549 550 config LD_HEAD_STUB_CATCH 551 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT 552 depends on PPC64 553 help 554 Very large kernels can cause linker branch stubs to be generated by 555 code in head_64.S, which moves the head text sections out of their 556 specified location. This option can work around the problem. 557 558 If unsure, say "N". 559 560 config MPROFILE_KERNEL 561 depends on PPC64_ELF_ABI_V2 && FUNCTION_TRACER 562 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -mlittle-endian) if CPU_LITTLE_ENDIAN 563 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -mbig-endian) if CPU_BIG_ENDIAN 564 565 config ARCH_USING_PATCHABLE_FUNCTION_ENTRY 566 depends on FUNCTION_TRACER && (PPC32 || PPC64_ELF_ABI_V2) 567 depends on $(cc-option,-fpatchable-function-entry=2) 568 def_bool y if PPC32 569 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-fpatchable-function-entry.sh $(CC) -mlittle-endian) if PPC64 && CPU_LITTLE_ENDIAN 570 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-fpatchable-function-entry.sh $(CC) -mbig-endian) if PPC64 && CPU_BIG_ENDIAN 571 572 config HOTPLUG_CPU 573 bool "Support for enabling/disabling CPUs" 574 depends on SMP && (PPC_PSERIES || \ 575 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE) 576 help 577 Say Y here to be able to disable and re-enable individual 578 CPUs at runtime on SMP machines. 579 580 Say N if you are unsure. 581 582 config INTERRUPT_SANITIZE_REGISTERS 583 bool "Clear gprs on interrupt arrival" 584 depends on PPC64 && ARCH_HAS_SYSCALL_WRAPPER 585 default PPC_BOOK3E_64 || PPC_PSERIES || PPC_POWERNV 586 help 587 Reduce the influence of user register state on interrupt handlers and 588 syscalls through clearing user state from registers before handling 589 the exception. 590 591 config PPC_QUEUED_SPINLOCKS 592 bool "Queued spinlocks" if EXPERT 593 depends on SMP 594 default PPC_BOOK3S_64 595 help 596 Say Y here to use queued spinlocks which give better scalability and 597 fairness on large SMP and NUMA systems without harming single threaded 598 performance. 599 600 config ARCH_CPU_PROBE_RELEASE 601 def_bool y 602 depends on HOTPLUG_CPU 603 604 config PPC64_SUPPORTS_MEMORY_FAILURE 605 bool "Add support for memory hwpoison" 606 depends on PPC_BOOK3S_64 607 default "y" if PPC_POWERNV 608 select ARCH_SUPPORTS_MEMORY_FAILURE 609 610 config ARCH_SUPPORTS_KEXEC 611 def_bool PPC_BOOK3S || PPC_E500 || (44x && !SMP) 612 613 config ARCH_SUPPORTS_KEXEC_FILE 614 def_bool PPC64 615 616 config ARCH_SUPPORTS_KEXEC_PURGATORY 617 def_bool y 618 619 config ARCH_SELECTS_KEXEC_FILE 620 def_bool y 621 depends on KEXEC_FILE 622 select KEXEC_ELF 623 select HAVE_IMA_KEXEC if IMA 624 625 config PPC64_BIG_ENDIAN_ELF_ABI_V2 626 # Option is available to BFD, but LLD does not support ELFv1 so this is 627 # always true there. 628 prompt "Build big-endian kernel using ELF ABI V2" if LD_IS_BFD && EXPERT 629 def_bool y 630 depends on PPC64 && CPU_BIG_ENDIAN 631 depends on CC_HAS_ELFV2 632 help 633 This builds the kernel image using the "Power Architecture 64-Bit ELF 634 V2 ABI Specification", which has a reduced stack overhead and faster 635 function calls. This internal kernel ABI option does not affect 636 userspace compatibility. 637 638 The V2 ABI is standard for 64-bit little-endian, but for big-endian 639 it is less well tested by kernel and toolchain. However some distros 640 build userspace this way, and it can produce a functioning kernel. 641 642 config RELOCATABLE 643 bool "Build a relocatable kernel" 644 depends on PPC64 || (FLATMEM && (44x || PPC_85xx)) 645 select NONSTATIC_KERNEL 646 help 647 This builds a kernel image that is capable of running at the 648 location the kernel is loaded at. For ppc32, there is no any 649 alignment restrictions, and this feature is a superset of 650 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use 651 16k-aligned base address. The kernel is linked as a 652 position-independent executable (PIE) and contains dynamic relocations 653 which are processed early in the bootup process. 654 655 One use is for the kexec on panic case where the recovery kernel 656 must live at a different physical address than the primary 657 kernel. 658 659 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address 660 it has been loaded at and the compile time physical addresses 661 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START 662 setting can still be useful to bootwrappers that need to know the 663 load address of the kernel (eg. u-boot/mkimage). 664 665 config RANDOMIZE_BASE 666 bool "Randomize the address of the kernel image" 667 depends on PPC_85xx && FLATMEM 668 depends on RELOCATABLE 669 help 670 Randomizes the virtual address at which the kernel image is 671 loaded, as a security feature that deters exploit attempts 672 relying on knowledge of the location of kernel internals. 673 674 If unsure, say Y. 675 676 config RELOCATABLE_TEST 677 bool "Test relocatable kernel" 678 depends on (PPC64 && RELOCATABLE) 679 help 680 This runs the relocatable kernel at the address it was initially 681 loaded at, which tends to be non-zero and therefore test the 682 relocation code. 683 684 config ARCH_SUPPORTS_CRASH_DUMP 685 def_bool PPC64 || PPC_BOOK3S_32 || PPC_85xx || (44x && !SMP) 686 687 config ARCH_SELECTS_CRASH_DUMP 688 def_bool y 689 depends on CRASH_DUMP 690 select RELOCATABLE if PPC64 || 44x || PPC_85xx 691 692 config ARCH_SUPPORTS_CRASH_HOTPLUG 693 def_bool y 694 depends on PPC64 695 696 config FA_DUMP 697 bool "Firmware-assisted dump" 698 depends on CRASH_DUMP && PPC64 && (PPC_RTAS || PPC_POWERNV) 699 help 700 A robust mechanism to get reliable kernel crash dump with 701 assistance from firmware. This approach does not use kexec, 702 instead firmware assists in booting the capture kernel 703 while preserving memory contents. Firmware-assisted dump 704 is meant to be a kdump replacement offering robustness and 705 speed not possible without system firmware assistance. 706 707 If unsure, say "y". Only special kernels like petitboot may 708 need to say "N" here. 709 710 config PRESERVE_FA_DUMP 711 bool "Preserve Firmware-assisted dump" 712 depends on PPC64 && PPC_POWERNV && !FA_DUMP 713 help 714 On a kernel with FA_DUMP disabled, this option helps to preserve 715 crash data from a previously crash'ed kernel. Useful when the next 716 memory preserving kernel boot would process this crash data. 717 Petitboot kernel is the typical usecase for this option. 718 719 config OPAL_CORE 720 bool "Export OPAL memory as /sys/firmware/opal/core" 721 depends on PPC64 && PPC_POWERNV 722 help 723 This option uses the MPIPL support in firmware to provide an 724 ELF core of OPAL memory after a crash. The ELF core is exported 725 as /sys/firmware/opal/core file which is helpful in debugging 726 OPAL crashes using GDB. 727 728 config IRQ_ALL_CPUS 729 bool "Distribute interrupts on all CPUs by default" 730 depends on SMP 731 help 732 This option gives the kernel permission to distribute IRQs across 733 multiple CPUs. Saying N here will route all IRQs to the first 734 CPU. Generally saying Y is safe, although some problems have been 735 reported with SMP Power Macintoshes with this option enabled. 736 737 config NUMA 738 bool "NUMA Memory Allocation and Scheduler Support" 739 depends on PPC64 && SMP 740 default y if PPC_PSERIES || PPC_POWERNV 741 select USE_PERCPU_NUMA_NODE_ID 742 help 743 Enable NUMA (Non-Uniform Memory Access) support. 744 745 The kernel will try to allocate memory used by a CPU on the 746 local memory controller of the CPU and add some more 747 NUMA awareness to the kernel. 748 749 config NODES_SHIFT 750 int 751 default "8" if PPC64 752 default "4" 753 depends on NUMA 754 755 config HAVE_MEMORYLESS_NODES 756 def_bool y 757 depends on NUMA 758 759 config ARCH_SELECT_MEMORY_MODEL 760 def_bool y 761 depends on PPC64 762 763 config ARCH_FLATMEM_ENABLE 764 def_bool y 765 depends on (PPC64 && !NUMA) || PPC32 766 767 config ARCH_SPARSEMEM_ENABLE 768 def_bool y 769 depends on PPC64 770 select SPARSEMEM_VMEMMAP_ENABLE 771 772 config ARCH_SPARSEMEM_DEFAULT 773 def_bool y 774 depends on PPC_BOOK3S_64 775 776 config ILLEGAL_POINTER_VALUE 777 hex 778 # This is roughly half way between the top of user space and the bottom 779 # of kernel space, which seems about as good as we can get. 780 default 0x5deadbeef0000000 if PPC64 781 default 0 782 783 config ARCH_MEMORY_PROBE 784 def_bool y 785 depends on MEMORY_HOTPLUG 786 787 choice 788 prompt "Page size" 789 default PPC_64K_PAGES if PPC_BOOK3S_64 790 default PPC_4K_PAGES 791 help 792 Select the kernel logical page size. Increasing the page size 793 will reduce software overhead at each page boundary, allow 794 hardware prefetch mechanisms to be more effective, and allow 795 larger dma transfers increasing IO efficiency and reducing 796 overhead. However the utilization of memory will increase. 797 For example, each cached file will using a multiple of the 798 page size to hold its contents and the difference between the 799 end of file and the end of page is wasted. 800 801 Some dedicated systems, such as software raid serving with 802 accelerated calculations, have shown significant increases. 803 804 If you configure a 64 bit kernel for 64k pages but the 805 processor does not support them, then the kernel will simulate 806 them with 4k pages, loading them on demand, but with the 807 reduced software overhead and larger internal fragmentation. 808 For the 32 bit kernel, a large page option will not be offered 809 unless it is supported by the configured processor. 810 811 If unsure, choose 4K_PAGES. 812 813 config PPC_4K_PAGES 814 bool "4k page size" 815 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 816 select HAVE_PAGE_SIZE_4KB 817 818 config PPC_16K_PAGES 819 bool "16k page size" 820 depends on 44x || PPC_8xx 821 select HAVE_PAGE_SIZE_16KB 822 823 config PPC_64K_PAGES 824 bool "64k page size" 825 depends on 44x || PPC_BOOK3S_64 826 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 827 select HAVE_PAGE_SIZE_64KB 828 829 config PPC_256K_PAGES 830 bool "256k page size (Requires non-standard binutils settings)" 831 depends on 44x && !PPC_47x 832 select HAVE_PAGE_SIZE_256KB 833 help 834 Make the page size 256k. 835 836 The kernel will only be able to run applications that have been 837 compiled with '-zmax-page-size' set to 256K (the default is 64K) using 838 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE 839 definition from 0x10000 to 0x40000 in older versions. 840 841 endchoice 842 843 config THREAD_SHIFT 844 int "Thread shift" if EXPERT 845 range 13 15 846 default "15" if PPC_256K_PAGES 847 default "15" if PPC_PSERIES || PPC_POWERNV 848 default "14" if PPC64 849 default "13" 850 help 851 Used to define the stack size. The default is almost always what you 852 want. Only change this if you know what you are doing. 853 854 config DATA_SHIFT_BOOL 855 bool "Set custom data alignment" 856 depends on ADVANCED_OPTIONS 857 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE 858 depends on (PPC_8xx && !PIN_TLB_DATA && (!STRICT_KERNEL_RWX || !PIN_TLB_TEXT)) || \ 859 PPC_BOOK3S_32 || PPC_85xx 860 help 861 This option allows you to set the kernel data alignment. When 862 RAM is mapped by blocks, the alignment needs to fit the size and 863 number of possible blocks. The default should be OK for most configs. 864 865 Say N here unless you know what you are doing. 866 867 config DATA_SHIFT 868 int "Data shift" if DATA_SHIFT_BOOL 869 default 24 if STRICT_KERNEL_RWX && PPC64 870 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32 871 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx 872 range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_85xx 873 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32 874 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32 875 default 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && \ 876 (PIN_TLB_DATA || PIN_TLB_TEXT) 877 default 19 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx 878 default 24 if STRICT_KERNEL_RWX && PPC_85xx 879 default PAGE_SHIFT 880 help 881 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO. 882 Smaller is the alignment, greater is the number of necessary DBATs. 883 884 On 8xx, large pages (512kb or 8M) are used to map kernel linear 885 memory. Aligning to 8M reduces TLB misses as only 8M pages are used 886 in that case. If PIN_TLB is selected, it must be aligned to 8M as 887 8M pages will be pinned. 888 889 config ARCH_FORCE_MAX_ORDER 890 int "Order of maximal physically contiguous allocations" 891 range 7 8 if PPC64 && PPC_64K_PAGES 892 default "8" if PPC64 && PPC_64K_PAGES 893 range 12 12 if PPC64 && !PPC_64K_PAGES 894 default "12" if PPC64 && !PPC_64K_PAGES 895 range 8 10 if PPC32 && PPC_16K_PAGES 896 default "8" if PPC32 && PPC_16K_PAGES 897 range 6 10 if PPC32 && PPC_64K_PAGES 898 default "6" if PPC32 && PPC_64K_PAGES 899 range 4 10 if PPC32 && PPC_256K_PAGES 900 default "4" if PPC32 && PPC_256K_PAGES 901 range 10 12 902 default "10" 903 help 904 The kernel page allocator limits the size of maximal physically 905 contiguous allocations. The limit is called MAX_PAGE_ORDER and it 906 defines the maximal power of two of number of pages that can be 907 allocated as a single contiguous block. This option allows 908 overriding the default setting when ability to allocate very 909 large blocks of physically contiguous memory is required. 910 911 The page size is not necessarily 4KB. For example, on 64-bit 912 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep 913 this in mind when choosing a value for this option. 914 915 Don't change if unsure. 916 917 config PPC_SUBPAGE_PROT 918 bool "Support setting protections for 4k subpages (subpage_prot syscall)" 919 default n 920 depends on PPC_64S_HASH_MMU && PPC_64K_PAGES 921 help 922 This option adds support for system call to allow user programs 923 to set access permissions (read/write, readonly, or no access) 924 on the 4k subpages of each 64k page. 925 926 If unsure, say N here. 927 928 config PPC_PROT_SAO_LPAR 929 bool "Support PROT_SAO mappings in LPARs" 930 depends on PPC_BOOK3S_64 931 help 932 This option adds support for PROT_SAO mappings from userspace 933 inside LPARs on supported CPUs. 934 935 This may cause issues when performing guest migration from 936 a CPU that supports SAO to one that does not. 937 938 If unsure, say N here. 939 940 config PPC_COPRO_BASE 941 bool 942 943 config SCHED_SMT 944 bool "SMT (Hyperthreading) scheduler support" 945 depends on PPC64 && SMP 946 help 947 SMT scheduler support improves the CPU scheduler's decision making 948 when dealing with POWER5 cpus at a cost of slightly increased 949 overhead in some places. If unsure say N here. 950 951 config PPC_DENORMALISATION 952 bool "PowerPC denormalisation exception handling" 953 depends on PPC_BOOK3S_64 954 default "y" if PPC_POWERNV 955 help 956 Add support for handling denormalisation of single precision 957 values. Useful for bare metal only. If unsure say Y here. 958 959 config CMDLINE 960 string "Initial kernel command string" 961 default "" 962 help 963 On some platforms, there is currently no way for the boot loader to 964 pass arguments to the kernel. For these platforms, you can supply 965 some command-line options at build time by entering them here. In 966 most cases you will need to specify the root device here. 967 968 choice 969 prompt "Kernel command line type" 970 depends on CMDLINE != "" 971 default CMDLINE_FROM_BOOTLOADER 972 973 config CMDLINE_FROM_BOOTLOADER 974 bool "Use bootloader kernel arguments if available" 975 help 976 Uses the command-line options passed by the boot loader. If 977 the boot loader doesn't provide any, the default kernel command 978 string provided in CMDLINE will be used. 979 980 config CMDLINE_EXTEND 981 bool "Extend bootloader kernel arguments" 982 help 983 The command-line arguments provided by the boot loader will be 984 appended to the default kernel command string. 985 986 config CMDLINE_FORCE 987 bool "Always use the default kernel command string" 988 help 989 Always use the default kernel command string, even if the boot 990 loader passes other arguments to the kernel. 991 This is useful if you cannot or don't want to change the 992 command-line options your boot loader passes to the kernel. 993 994 endchoice 995 996 config EXTRA_TARGETS 997 string "Additional default image types" 998 help 999 List additional targets to be built by the bootwrapper here (separated 1000 by spaces). This is useful for targets that depend of device tree 1001 files in the .dts directory. 1002 1003 Targets in this list will be build as part of the default build 1004 target, or when the user does a 'make zImage' or a 1005 'make zImage.initrd'. 1006 1007 If unsure, leave blank 1008 1009 config ARCH_WANTS_FREEZER_CONTROL 1010 def_bool y 1011 depends on ADB_PMU 1012 1013 source "kernel/power/Kconfig" 1014 1015 config PPC_MEM_KEYS 1016 prompt "PowerPC Memory Protection Keys" 1017 def_bool y 1018 depends on PPC_BOOK3S_64 1019 depends on PPC_64S_HASH_MMU 1020 select ARCH_USES_HIGH_VMA_FLAGS 1021 select ARCH_HAS_PKEYS 1022 help 1023 Memory Protection Keys provides a mechanism for enforcing 1024 page-based protections, but without requiring modification of the 1025 page tables when an application changes protection domains. 1026 1027 For details, see Documentation/core-api/protection-keys.rst 1028 1029 If unsure, say y. 1030 1031 config ARCH_PKEY_BITS 1032 int 1033 default 5 1034 1035 config PPC_SECURE_BOOT 1036 prompt "Enable secure boot support" 1037 bool 1038 depends on PPC_POWERNV || PPC_PSERIES 1039 depends on IMA_ARCH_POLICY 1040 imply IMA_SECURE_AND_OR_TRUSTED_BOOT 1041 select PSERIES_PLPKS if PPC_PSERIES 1042 help 1043 Systems with firmware secure boot enabled need to define security 1044 policies to extend secure boot to the OS. This config allows a user 1045 to enable OS secure boot on systems that have firmware support for 1046 it. If in doubt say N. 1047 1048 config PPC_SECVAR_SYSFS 1049 bool "Enable sysfs interface for POWER secure variables" 1050 default y 1051 depends on PPC_SECURE_BOOT 1052 depends on SYSFS 1053 help 1054 POWER secure variables are managed and controlled by firmware. 1055 These variables are exposed to userspace via sysfs to enable 1056 read/write operations on these variables. Say Y if you have 1057 secure boot enabled and want to expose variables to userspace. 1058 1059 endmenu 1060 1061 config ISA_DMA_API 1062 bool 1063 default PCI 1064 1065 menu "Bus options" 1066 1067 config ISA 1068 bool "Support for ISA-bus hardware" 1069 depends on PPC_CHRP 1070 select PPC_I8259 1071 help 1072 Find out whether you have ISA slots on your motherboard. ISA is the 1073 name of a bus system, i.e. the way the CPU talks to the other stuff 1074 inside your box. If you have an Apple machine, say N here; if you 1075 have an IBM RS/6000 or pSeries machine, say Y. If you have an 1076 embedded board, consult your board documentation. 1077 1078 config GENERIC_ISA_DMA 1079 bool 1080 depends on ISA_DMA_API 1081 default y 1082 1083 config PPC_INDIRECT_PCI 1084 bool 1085 depends on PCI 1086 default y if 44x 1087 1088 config SBUS 1089 bool 1090 1091 config FSL_SOC 1092 bool 1093 1094 config FSL_PCI 1095 bool 1096 select ARCH_HAS_DMA_SET_MASK 1097 select PPC_INDIRECT_PCI 1098 select PCI_QUIRKS 1099 1100 config FSL_PMC 1101 bool 1102 default y 1103 depends on SUSPEND && (PPC_85xx || PPC_86xx) 1104 help 1105 Freescale MPC85xx/MPC86xx power management controller support 1106 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c 1107 1108 config PPC4xx_CPM 1109 bool 1110 default y 1111 depends on SUSPEND && 44x 1112 help 1113 PPC4xx Clock Power Management (CPM) support (suspend/resume). 1114 It also enables support for two different idle states (idle-wait 1115 and idle-doze). 1116 1117 config FSL_LBC 1118 bool "Freescale Local Bus support" 1119 help 1120 Enables reporting of errors from the Freescale local bus 1121 controller. Also contains some common code used by 1122 drivers for specific local bus peripherals. 1123 1124 config FSL_GTM 1125 bool 1126 depends on PPC_83xx || QUICC_ENGINE || CPM2 1127 help 1128 Freescale General-purpose Timers support 1129 1130 config FSL_RIO 1131 bool "Freescale Embedded SRIO Controller support" 1132 depends on RAPIDIO = y && HAVE_RAPIDIO 1133 default "n" 1134 help 1135 Include support for RapidIO controller on Freescale embedded 1136 processors (MPC8548, MPC8641, etc). 1137 1138 endmenu 1139 1140 config NONSTATIC_KERNEL 1141 bool 1142 1143 menu "Advanced setup" 1144 depends on PPC32 1145 1146 config ADVANCED_OPTIONS 1147 bool "Prompt for advanced kernel configuration options" 1148 help 1149 This option will enable prompting for a variety of advanced kernel 1150 configuration options. These options can cause the kernel to not 1151 work if they are set incorrectly, but can be used to optimize certain 1152 aspects of kernel memory management. 1153 1154 Unless you know what you are doing, say N here. 1155 1156 comment "Default settings for advanced configuration options are used" 1157 depends on !ADVANCED_OPTIONS 1158 1159 config LOWMEM_SIZE_BOOL 1160 bool "Set maximum low memory" 1161 depends on ADVANCED_OPTIONS 1162 help 1163 This option allows you to set the maximum amount of memory which 1164 will be used as "low memory", that is, memory which the kernel can 1165 access directly, without having to set up a kernel virtual mapping. 1166 This can be useful in optimizing the layout of kernel virtual 1167 memory. 1168 1169 Say N here unless you know what you are doing. 1170 1171 config LOWMEM_SIZE 1172 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL 1173 default "0x30000000" 1174 1175 config LOWMEM_CAM_NUM_BOOL 1176 bool "Set number of CAMs to use to map low memory" 1177 depends on ADVANCED_OPTIONS && PPC_85xx 1178 help 1179 This option allows you to set the maximum number of CAM slots that 1180 will be used to map low memory. There are a limited number of slots 1181 available and even more limited number that will fit in the L1 MMU. 1182 However, using more entries will allow mapping more low memory. This 1183 can be useful in optimizing the layout of kernel virtual memory. 1184 1185 Say N here unless you know what you are doing. 1186 1187 config LOWMEM_CAM_NUM 1188 depends on PPC_85xx 1189 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL 1190 default 3 if !STRICT_KERNEL_RWX 1191 default 9 if DATA_SHIFT >= 24 1192 default 12 if DATA_SHIFT >= 22 1193 default 15 1194 1195 config DYNAMIC_MEMSTART 1196 bool "Enable page aligned dynamic load address for kernel" 1197 depends on ADVANCED_OPTIONS && FLATMEM && (PPC_85xx || 44x) 1198 select NONSTATIC_KERNEL 1199 help 1200 This option enables the kernel to be loaded at any page aligned 1201 physical address. The kernel creates a mapping from KERNELBASE to 1202 the address where the kernel is loaded. The page size here implies 1203 the TLB page size of the mapping for kernel on the particular platform. 1204 Please refer to the init code for finding the TLB page size. 1205 1206 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE 1207 kernel image, where the only restriction is the page aligned kernel 1208 load address. When this option is enabled, the compile time physical 1209 address CONFIG_PHYSICAL_START is ignored. 1210 1211 This option is overridden by CONFIG_RELOCATABLE 1212 1213 config PAGE_OFFSET_BOOL 1214 bool "Set custom page offset address" 1215 depends on ADVANCED_OPTIONS 1216 help 1217 This option allows you to set the kernel virtual address at which 1218 the kernel will map low memory. This can be useful in optimizing 1219 the virtual memory layout of the system. 1220 1221 Say N here unless you know what you are doing. 1222 1223 config PAGE_OFFSET 1224 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL 1225 default "0xc0000000" 1226 1227 config KERNEL_START_BOOL 1228 bool "Set custom kernel base address" 1229 depends on ADVANCED_OPTIONS 1230 help 1231 This option allows you to set the kernel virtual address at which 1232 the kernel will be loaded. Normally this should match PAGE_OFFSET 1233 however there are times (like kdump) that one might not want them 1234 to be the same. 1235 1236 Say N here unless you know what you are doing. 1237 1238 config KERNEL_START 1239 hex "Virtual address of kernel base" if KERNEL_START_BOOL 1240 default PAGE_OFFSET if PAGE_OFFSET_BOOL 1241 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL 1242 default "0xc0000000" 1243 1244 config PHYSICAL_START_BOOL 1245 bool "Set physical address where the kernel is loaded" 1246 depends on ADVANCED_OPTIONS && FLATMEM && PPC_85xx 1247 help 1248 This gives the physical address where the kernel is loaded. 1249 1250 Say N here unless you know what you are doing. 1251 1252 config PHYSICAL_START 1253 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL 1254 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL 1255 default "0x00000000" 1256 1257 config PHYSICAL_ALIGN 1258 hex 1259 default "0x04000000" if PPC_85xx 1260 help 1261 This value puts the alignment restrictions on physical address 1262 where kernel is loaded and run from. Kernel is compiled for an 1263 address which meets above alignment restriction. 1264 1265 config TASK_SIZE_BOOL 1266 bool "Set custom user task size" 1267 depends on ADVANCED_OPTIONS 1268 help 1269 This option allows you to set the amount of virtual address space 1270 allocated to user tasks. This can be useful in optimizing the 1271 virtual memory layout of the system. 1272 1273 Say N here unless you know what you are doing. 1274 1275 config TASK_SIZE 1276 hex "Size of user task space" if TASK_SIZE_BOOL 1277 default "0x80000000" if PPC_8xx 1278 default "0xb0000000" if PPC_BOOK3S_32 && EXECMEM 1279 default "0xc0000000" 1280 1281 config MODULES_SIZE_BOOL 1282 bool "Set custom size for modules/execmem area" 1283 depends on EXECMEM && ADVANCED_OPTIONS 1284 help 1285 This option allows you to set the size of kernel virtual address 1286 space dedicated for modules/execmem. 1287 For the time being it is only for 8xx and book3s/32. Other 1288 platform share it with vmalloc space. 1289 1290 Say N here unless you know what you are doing. 1291 1292 config MODULES_SIZE 1293 int "Size of modules/execmem area (In Mbytes)" if MODULES_SIZE_BOOL 1294 range 1 256 if EXECMEM 1295 default 64 if EXECMEM && PPC_BOOK3S_32 1296 default 32 if EXECMEM && PPC_8xx 1297 default 0 1298 1299 endmenu 1300 1301 if PPC64 1302 # This value must have zeroes in the bottom 60 bits otherwise lots will break 1303 config PAGE_OFFSET 1304 hex 1305 default "0xc000000000000000" 1306 config KERNEL_START 1307 hex 1308 default "0xc000000000000000" 1309 config PHYSICAL_START 1310 hex 1311 default "0x00000000" 1312 endif 1313 1314 config PPC_LIB_RHEAP 1315 bool 1316 1317 source "arch/powerpc/kvm/Kconfig" 1318 1319 source "kernel/livepatch/Kconfig"
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