1# SPDX-License-Identifier: GPL-2.0 2source "arch/powerpc/platforms/Kconfig.cputype" 3 4config 32BIT 5 bool 6 default y if PPC32 7 8config 64BIT 9 bool 10 default y if PPC64 11 12config LIVEPATCH_64 13 def_bool PPC64 14 depends on LIVEPATCH 15 16config MMU 17 bool 18 default y 19 20config ARCH_MMAP_RND_BITS_MAX 21 # On Book3S 64, the default virtual address space for 64-bit processes 22 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to 23 # 32T of address space (2^45), which should ensure a reasonable gap 24 # between bottom-up and top-down allocations for applications that 25 # consume "normal" amounts of address space. Book3S 64 only supports 64K 26 # and 4K page sizes. 27 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K) 28 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K) 29 # 30 # On all other 64-bit platforms (currently only Book3E), the virtual 31 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T 32 # of address space (2^44). Only 4K page sizes are supported. 33 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K) 34 # 35 # For 32-bit, use the compat values, as they're the same. 36 default ARCH_MMAP_RND_COMPAT_BITS_MAX 37 38config ARCH_MMAP_RND_BITS_MIN 39 # Allow randomisation to consume up to 1GB of address space (2^30). 40 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K) 41 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K) 42 # 43 # For 32-bit, use the compat values, as they're the same. 44 default ARCH_MMAP_RND_COMPAT_BITS_MIN 45 46config ARCH_MMAP_RND_COMPAT_BITS_MAX 47 # Total virtual address space for 32-bit processes is 2^31 (2GB). 48 # Allow randomisation to consume up to 512MB of address space (2^29). 49 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K) 50 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K) 51 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K) 52 default 17 # 17 = 29 (512MB) - 12 (4K) 53 54config ARCH_MMAP_RND_COMPAT_BITS_MIN 55 # Total virtual address space for 32-bit processes is 2^31 (2GB). 56 # Allow randomisation to consume up to 8MB of address space (2^23). 57 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K) 58 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K) 59 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K) 60 default 11 # 11 = 23 (8MB) - 12 (4K) 61 62config NR_IRQS 63 int "Number of virtual interrupt numbers" 64 range 32 1048576 65 default "512" 66 help 67 This defines the number of virtual interrupt numbers the kernel 68 can manage. Virtual interrupt numbers are what you see in 69 /proc/interrupts. If you configure your system to have too few, 70 drivers will fail to load or worse - handle with care. 71 72config NMI_IPI 73 bool 74 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR) 75 default y 76 77config PPC_WATCHDOG 78 bool 79 depends on HARDLOCKUP_DETECTOR 80 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH 81 default y 82 help 83 This is a placeholder when the powerpc hardlockup detector 84 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is 85 selected via the generic lockup detector menu which is why we 86 have no standalone config option for it here. 87 88config STACKTRACE_SUPPORT 89 bool 90 default y 91 92config LOCKDEP_SUPPORT 93 bool 94 default y 95 96config GENERIC_LOCKBREAK 97 bool 98 default y 99 depends on SMP && PREEMPTION 100 101config GENERIC_HWEIGHT 102 bool 103 default y 104 105config PPC 106 bool 107 default y 108 # 109 # Please keep this list sorted alphabetically. 110 # 111 select ARCH_32BIT_OFF_T if PPC32 112 select ARCH_DISABLE_KASAN_INLINE if PPC_RADIX_MMU 113 select ARCH_ENABLE_MEMORY_HOTPLUG 114 select ARCH_ENABLE_MEMORY_HOTREMOVE 115 select ARCH_HAS_COPY_MC if PPC64 116 select ARCH_HAS_CURRENT_STACK_POINTER 117 select ARCH_HAS_DEBUG_VIRTUAL 118 select ARCH_HAS_DEBUG_VM_PGTABLE 119 select ARCH_HAS_DEBUG_WX if STRICT_KERNEL_RWX 120 select ARCH_HAS_DEVMEM_IS_ALLOWED 121 select ARCH_HAS_DMA_MAP_DIRECT if PPC_PSERIES 122 select ARCH_HAS_FORTIFY_SOURCE 123 select ARCH_HAS_GCOV_PROFILE_ALL 124 select ARCH_HAS_HUGEPD if HUGETLB_PAGE 125 select ARCH_HAS_KCOV 126 select ARCH_HAS_MEMBARRIER_CALLBACKS 127 select ARCH_HAS_MEMBARRIER_SYNC_CORE 128 select ARCH_HAS_MEMREMAP_COMPAT_ALIGN if PPC_64S_HASH_MMU 129 select ARCH_HAS_MMIOWB if PPC64 130 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE 131 select ARCH_HAS_PHYS_TO_DMA 132 select ARCH_HAS_PMEM_API 133 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64 134 select ARCH_HAS_PTE_SPECIAL 135 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64 136 select ARCH_HAS_SET_MEMORY 137 select ARCH_HAS_STRICT_KERNEL_RWX if (PPC_BOOK3S || PPC_8xx || 40x) && !HIBERNATION 138 select ARCH_HAS_STRICT_KERNEL_RWX if FSL_BOOKE && !HIBERNATION && !RANDOMIZE_BASE 139 select ARCH_HAS_STRICT_MODULE_RWX if ARCH_HAS_STRICT_KERNEL_RWX 140 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 141 select ARCH_HAS_UACCESS_FLUSHCACHE 142 select ARCH_HAS_UBSAN_SANITIZE_ALL 143 select ARCH_HAVE_NMI_SAFE_CMPXCHG 144 select ARCH_KEEP_MEMBLOCK 145 select ARCH_MIGHT_HAVE_PC_PARPORT 146 select ARCH_MIGHT_HAVE_PC_SERIO 147 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX 148 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT 149 select ARCH_STACKWALK 150 select ARCH_SUPPORTS_ATOMIC_RMW 151 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC_BOOK3S || PPC_8xx || 40x 152 select ARCH_USE_BUILTIN_BSWAP 153 select ARCH_USE_CMPXCHG_LOCKREF if PPC64 154 select ARCH_USE_MEMTEST 155 select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS 156 select ARCH_USE_QUEUED_SPINLOCKS if PPC_QUEUED_SPINLOCKS 157 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT 158 select ARCH_WANT_IPC_PARSE_VERSION 159 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM 160 select ARCH_WANT_LD_ORPHAN_WARN 161 select ARCH_WANTS_MODULES_DATA_IN_VMALLOC if PPC_BOOK3S_32 || PPC_8xx 162 select ARCH_WANTS_NO_INSTR 163 select ARCH_WEAK_RELEASE_ACQUIRE 164 select BINFMT_ELF 165 select BUILDTIME_TABLE_SORT 166 select CLONE_BACKWARDS 167 select CPUMASK_OFFSTACK if NR_CPUS >= 8192 168 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN 169 select DMA_OPS_BYPASS if PPC64 170 select DMA_OPS if PPC64 171 select DYNAMIC_FTRACE if FUNCTION_TRACER 172 select EDAC_ATOMIC_SCRUB 173 select EDAC_SUPPORT 174 select GENERIC_ATOMIC64 if PPC32 175 select GENERIC_CLOCKEVENTS_BROADCAST if SMP 176 select GENERIC_CMOS_UPDATE 177 select GENERIC_CPU_AUTOPROBE 178 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC 179 select GENERIC_EARLY_IOREMAP 180 select GENERIC_GETTIMEOFDAY 181 select GENERIC_IRQ_SHOW 182 select GENERIC_IRQ_SHOW_LEVEL 183 select GENERIC_PCI_IOMAP if PCI 184 select GENERIC_PTDUMP 185 select GENERIC_SMP_IDLE_THREAD 186 select GENERIC_TIME_VSYSCALL 187 select GENERIC_VDSO_TIME_NS 188 select HAVE_ARCH_AUDITSYSCALL 189 select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP 190 select HAVE_ARCH_HUGE_VMAP if PPC_RADIX_MMU || PPC_8xx 191 select HAVE_ARCH_JUMP_LABEL 192 select HAVE_ARCH_JUMP_LABEL_RELATIVE 193 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14 194 select HAVE_ARCH_KASAN if PPC_RADIX_MMU 195 select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN 196 select HAVE_ARCH_KFENCE if PPC_BOOK3S_32 || PPC_8xx || 40x 197 select HAVE_ARCH_KGDB 198 select HAVE_ARCH_MMAP_RND_BITS 199 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT 200 select HAVE_ARCH_NVRAM_OPS 201 select HAVE_ARCH_SECCOMP_FILTER 202 select HAVE_ARCH_TRACEHOOK 203 select HAVE_ASM_MODVERSIONS 204 select HAVE_CONTEXT_TRACKING_USER if PPC64 205 select HAVE_C_RECORDMCOUNT 206 select HAVE_DEBUG_KMEMLEAK 207 select HAVE_DEBUG_STACKOVERFLOW 208 select HAVE_DYNAMIC_FTRACE 209 select HAVE_DYNAMIC_FTRACE_WITH_ARGS if MPROFILE_KERNEL || PPC32 210 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL || PPC32 211 select HAVE_EBPF_JIT 212 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU) 213 select HAVE_FAST_GUP 214 select HAVE_FTRACE_MCOUNT_RECORD 215 select HAVE_FUNCTION_DESCRIPTORS if PPC64_ELF_ABI_V1 216 select HAVE_FUNCTION_ERROR_INJECTION 217 select HAVE_FUNCTION_GRAPH_TRACER 218 select HAVE_FUNCTION_TRACER 219 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC 220 select HAVE_GENERIC_VDSO 221 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC_BOOK3S_64 && SMP 222 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH 223 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx) 224 select HAVE_IOREMAP_PROT 225 select HAVE_IRQ_TIME_ACCOUNTING 226 select HAVE_KERNEL_GZIP 227 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE 228 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE 229 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x 230 select HAVE_KPROBES 231 select HAVE_KPROBES_ON_FTRACE 232 select HAVE_KRETPROBES 233 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION 234 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS 235 select HAVE_MOD_ARCH_SPECIFIC 236 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S) 237 select HAVE_OPTPROBES 238 select HAVE_PERF_EVENTS 239 select HAVE_PERF_EVENTS_NMI if PPC64 240 select HAVE_PERF_REGS 241 select HAVE_PERF_USER_STACK_DUMP 242 select HAVE_REGS_AND_STACK_ACCESS_API 243 select HAVE_RELIABLE_STACKTRACE 244 select HAVE_RSEQ 245 select HAVE_SETUP_PER_CPU_AREA if PPC64 246 select HAVE_SOFTIRQ_ON_OWN_STACK 247 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2) 248 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13) 249 select HAVE_STATIC_CALL if PPC32 250 select HAVE_SYSCALL_TRACEPOINTS 251 select HAVE_VIRT_CPU_ACCOUNTING 252 select HUGETLB_PAGE_SIZE_VARIABLE if PPC_BOOK3S_64 && HUGETLB_PAGE 253 select IOMMU_HELPER if PPC64 254 select IRQ_DOMAIN 255 select IRQ_FORCED_THREADING 256 select MMU_GATHER_PAGE_SIZE 257 select MMU_GATHER_RCU_TABLE_FREE 258 select MMU_GATHER_MERGE_VMAS 259 select MODULES_USE_ELF_RELA 260 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE 261 select NEED_PER_CPU_EMBED_FIRST_CHUNK if PPC64 262 select NEED_PER_CPU_PAGE_FIRST_CHUNK if PPC64 263 select NEED_SG_DMA_LENGTH 264 select OF 265 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE 266 select OF_EARLY_FLATTREE 267 select OLD_SIGACTION if PPC32 268 select OLD_SIGSUSPEND 269 select PCI_DOMAINS if PCI 270 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI 271 select PCI_SYSCALL if PCI 272 select PPC_DAWR if PPC64 273 select RTC_LIB 274 select SPARSE_IRQ 275 select STRICT_KERNEL_RWX if STRICT_MODULE_RWX 276 select SYSCTL_EXCEPTION_TRACE 277 select THREAD_INFO_IN_TASK 278 select TRACE_IRQFLAGS_SUPPORT 279 # 280 # Please keep this list sorted alphabetically. 281 # 282 283config PPC_LONG_DOUBLE_128 284 depends on PPC64 285 def_bool $(success,test "$(shell,echo __LONG_DOUBLE_128__ | $(CC) -E -P -)" = 1) 286 287config PPC_BARRIER_NOSPEC 288 bool 289 default y 290 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E 291 292config EARLY_PRINTK 293 bool 294 default y 295 296config PANIC_TIMEOUT 297 int 298 default 180 299 300config COMPAT 301 bool "Enable support for 32bit binaries" 302 depends on PPC64 303 depends on !CC_IS_CLANG || CLANG_VERSION >= 120000 304 default y if !CPU_LITTLE_ENDIAN 305 select ARCH_WANT_OLD_COMPAT_IPC 306 select COMPAT_OLD_SIGACTION 307 308config SCHED_OMIT_FRAME_POINTER 309 bool 310 default y 311 312config ARCH_MAY_HAVE_PC_FDC 313 bool 314 default PCI 315 316config PPC_UDBG_16550 317 bool 318 319config GENERIC_TBSYNC 320 bool 321 default y if PPC32 && SMP 322 323config AUDIT_ARCH 324 bool 325 default y 326 327config GENERIC_BUG 328 bool 329 default y 330 depends on BUG 331 332config GENERIC_BUG_RELATIVE_POINTERS 333 def_bool y 334 depends on GENERIC_BUG 335 336config SYS_SUPPORTS_APM_EMULATION 337 default y if PMAC_APM_EMU 338 bool 339 340config EPAPR_BOOT 341 bool 342 help 343 Used to allow a board to specify it wants an ePAPR compliant wrapper. 344 345config DEFAULT_UIMAGE 346 bool 347 help 348 Used to allow a board to specify it wants a uImage built by default 349 350config ARCH_HIBERNATION_POSSIBLE 351 bool 352 default y 353 354config ARCH_SUSPEND_POSSIBLE 355 def_bool y 356 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \ 357 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \ 358 || 44x || 40x 359 360config ARCH_SUSPEND_NONZERO_CPU 361 def_bool y 362 depends on PPC_POWERNV || PPC_PSERIES 363 364config ARCH_HAS_ADD_PAGES 365 def_bool y 366 depends on ARCH_ENABLE_MEMORY_HOTPLUG 367 368config PPC_DCR_NATIVE 369 bool 370 371config PPC_DCR_MMIO 372 bool 373 374config PPC_DCR 375 bool 376 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO 377 default y 378 379config PPC_OF_PLATFORM_PCI 380 bool 381 depends on PCI 382 depends on PPC64 # not supported on 32 bits yet 383 384config ARCH_SUPPORTS_UPROBES 385 def_bool y 386 387config PPC_ADV_DEBUG_REGS 388 bool 389 depends on 40x || BOOKE 390 default y 391 392config PPC_ADV_DEBUG_IACS 393 int 394 depends on PPC_ADV_DEBUG_REGS 395 default 4 if 44x 396 default 2 397 398config PPC_ADV_DEBUG_DACS 399 int 400 depends on PPC_ADV_DEBUG_REGS 401 default 2 402 403config PPC_ADV_DEBUG_DVCS 404 int 405 depends on PPC_ADV_DEBUG_REGS 406 default 2 if 44x 407 default 0 408 409config PPC_ADV_DEBUG_DAC_RANGE 410 bool 411 depends on PPC_ADV_DEBUG_REGS && 44x 412 default y 413 414config PPC_DAWR 415 bool 416 417config PGTABLE_LEVELS 418 int 419 default 2 if !PPC64 420 default 4 421 422source "arch/powerpc/sysdev/Kconfig" 423source "arch/powerpc/platforms/Kconfig" 424 425menu "Kernel options" 426 427config HIGHMEM 428 bool "High memory support" 429 depends on PPC32 430 select KMAP_LOCAL 431 432source "kernel/Kconfig.hz" 433 434config MATH_EMULATION 435 bool "Math emulation" 436 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT 437 select PPC_FPU_REGS 438 help 439 Some PowerPC chips designed for embedded applications do not have 440 a floating-point unit and therefore do not implement the 441 floating-point instructions in the PowerPC instruction set. If you 442 say Y here, the kernel will include code to emulate a floating-point 443 unit, which will allow programs that use floating-point 444 instructions to run. 445 446 This is also useful to emulate missing (optional) instructions 447 such as fsqrt on cores that do have an FPU but do not implement 448 them (such as Freescale BookE). 449 450choice 451 prompt "Math emulation options" 452 default MATH_EMULATION_FULL 453 depends on MATH_EMULATION 454 455config MATH_EMULATION_FULL 456 bool "Emulate all the floating point instructions" 457 help 458 Select this option will enable the kernel to support to emulate 459 all the floating point instructions. If your SoC doesn't have 460 a FPU, you should select this. 461 462config MATH_EMULATION_HW_UNIMPLEMENTED 463 bool "Just emulate the FPU unimplemented instructions" 464 help 465 Select this if you know there does have a hardware FPU on your 466 SoC, but some floating point instructions are not implemented by that. 467 468endchoice 469 470config PPC_TRANSACTIONAL_MEM 471 bool "Transactional Memory support for POWERPC" 472 depends on PPC_BOOK3S_64 473 depends on SMP 474 select ALTIVEC 475 select VSX 476 help 477 Support user-mode Transactional Memory on POWERPC. 478 479config PPC_UV 480 bool "Ultravisor support" 481 depends on KVM_BOOK3S_HV_POSSIBLE 482 depends on DEVICE_PRIVATE 483 default n 484 help 485 This option paravirtualizes the kernel to run in POWER platforms that 486 supports the Protected Execution Facility (PEF). On such platforms, 487 the ultravisor firmware runs at a privilege level above the 488 hypervisor. 489 490 If unsure, say "N". 491 492config LD_HEAD_STUB_CATCH 493 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT 494 depends on PPC64 495 help 496 Very large kernels can cause linker branch stubs to be generated by 497 code in head_64.S, which moves the head text sections out of their 498 specified location. This option can work around the problem. 499 500 If unsure, say "N". 501 502config MPROFILE_KERNEL 503 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER 504 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__) 505 506config HOTPLUG_CPU 507 bool "Support for enabling/disabling CPUs" 508 depends on SMP && (PPC_PSERIES || \ 509 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE) 510 help 511 Say Y here to be able to disable and re-enable individual 512 CPUs at runtime on SMP machines. 513 514 Say N if you are unsure. 515 516config PPC_QUEUED_SPINLOCKS 517 bool "Queued spinlocks" if EXPERT 518 depends on SMP 519 default PPC_BOOK3S_64 520 help 521 Say Y here to use queued spinlocks which give better scalability and 522 fairness on large SMP and NUMA systems without harming single threaded 523 performance. 524 525config ARCH_CPU_PROBE_RELEASE 526 def_bool y 527 depends on HOTPLUG_CPU 528 529config PPC64_SUPPORTS_MEMORY_FAILURE 530 bool "Add support for memory hwpoison" 531 depends on PPC_BOOK3S_64 532 default "y" if PPC_POWERNV 533 select ARCH_SUPPORTS_MEMORY_FAILURE 534 535config KEXEC 536 bool "kexec system call" 537 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E 538 select KEXEC_CORE 539 help 540 kexec is a system call that implements the ability to shutdown your 541 current kernel, and to start another kernel. It is like a reboot 542 but it is independent of the system firmware. And like a reboot 543 you can start any kernel with it, not just Linux. 544 545 The name comes from the similarity to the exec system call. 546 547 It is an ongoing process to be certain the hardware in a machine 548 is properly shutdown, so do not be surprised if this code does not 549 initially work for you. As of this writing the exact hardware 550 interface is strongly in flux, so no good recommendation can be 551 made. 552 553config KEXEC_FILE 554 bool "kexec file based system call" 555 select KEXEC_CORE 556 select HAVE_IMA_KEXEC if IMA 557 select BUILD_BIN2C 558 select KEXEC_ELF 559 depends on PPC64 560 depends on CRYPTO=y 561 depends on CRYPTO_SHA256=y 562 help 563 This is a new version of the kexec system call. This call is 564 file based and takes in file descriptors as system call arguments 565 for kernel and initramfs as opposed to a list of segments as is the 566 case for the older kexec call. 567 568config ARCH_HAS_KEXEC_PURGATORY 569 def_bool KEXEC_FILE 570 571config RELOCATABLE 572 bool "Build a relocatable kernel" 573 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE)) 574 select NONSTATIC_KERNEL 575 help 576 This builds a kernel image that is capable of running at the 577 location the kernel is loaded at. For ppc32, there is no any 578 alignment restrictions, and this feature is a superset of 579 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use 580 16k-aligned base address. The kernel is linked as a 581 position-independent executable (PIE) and contains dynamic relocations 582 which are processed early in the bootup process. 583 584 One use is for the kexec on panic case where the recovery kernel 585 must live at a different physical address than the primary 586 kernel. 587 588 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address 589 it has been loaded at and the compile time physical addresses 590 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START 591 setting can still be useful to bootwrappers that need to know the 592 load address of the kernel (eg. u-boot/mkimage). 593 594config RANDOMIZE_BASE 595 bool "Randomize the address of the kernel image" 596 depends on (FSL_BOOKE && FLATMEM && PPC32) 597 depends on RELOCATABLE 598 help 599 Randomizes the virtual address at which the kernel image is 600 loaded, as a security feature that deters exploit attempts 601 relying on knowledge of the location of kernel internals. 602 603 If unsure, say Y. 604 605config RELOCATABLE_TEST 606 bool "Test relocatable kernel" 607 depends on (PPC64 && RELOCATABLE) 608 help 609 This runs the relocatable kernel at the address it was initially 610 loaded at, which tends to be non-zero and therefore test the 611 relocation code. 612 613config CRASH_DUMP 614 bool "Build a dump capture kernel" 615 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP) 616 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE 617 help 618 Build a kernel suitable for use as a dump capture kernel. 619 The same kernel binary can be used as production kernel and dump 620 capture kernel. 621 622config FA_DUMP 623 bool "Firmware-assisted dump" 624 depends on PPC64 && (PPC_RTAS || PPC_POWERNV) 625 select CRASH_CORE 626 select CRASH_DUMP 627 help 628 A robust mechanism to get reliable kernel crash dump with 629 assistance from firmware. This approach does not use kexec, 630 instead firmware assists in booting the capture kernel 631 while preserving memory contents. Firmware-assisted dump 632 is meant to be a kdump replacement offering robustness and 633 speed not possible without system firmware assistance. 634 635 If unsure, say "y". Only special kernels like petitboot may 636 need to say "N" here. 637 638config PRESERVE_FA_DUMP 639 bool "Preserve Firmware-assisted dump" 640 depends on PPC64 && PPC_POWERNV && !FA_DUMP 641 help 642 On a kernel with FA_DUMP disabled, this option helps to preserve 643 crash data from a previously crash'ed kernel. Useful when the next 644 memory preserving kernel boot would process this crash data. 645 Petitboot kernel is the typical usecase for this option. 646 647config OPAL_CORE 648 bool "Export OPAL memory as /sys/firmware/opal/core" 649 depends on PPC64 && PPC_POWERNV 650 help 651 This option uses the MPIPL support in firmware to provide an 652 ELF core of OPAL memory after a crash. The ELF core is exported 653 as /sys/firmware/opal/core file which is helpful in debugging 654 OPAL crashes using GDB. 655 656config IRQ_ALL_CPUS 657 bool "Distribute interrupts on all CPUs by default" 658 depends on SMP 659 help 660 This option gives the kernel permission to distribute IRQs across 661 multiple CPUs. Saying N here will route all IRQs to the first 662 CPU. Generally saying Y is safe, although some problems have been 663 reported with SMP Power Macintoshes with this option enabled. 664 665config NUMA 666 bool "NUMA Memory Allocation and Scheduler Support" 667 depends on PPC64 && SMP 668 default y if PPC_PSERIES || PPC_POWERNV 669 select USE_PERCPU_NUMA_NODE_ID 670 help 671 Enable NUMA (Non-Uniform Memory Access) support. 672 673 The kernel will try to allocate memory used by a CPU on the 674 local memory controller of the CPU and add some more 675 NUMA awareness to the kernel. 676 677config NODES_SHIFT 678 int 679 default "8" if PPC64 680 default "4" 681 depends on NUMA 682 683config HAVE_MEMORYLESS_NODES 684 def_bool y 685 depends on NUMA 686 687config ARCH_SELECT_MEMORY_MODEL 688 def_bool y 689 depends on PPC64 690 691config ARCH_FLATMEM_ENABLE 692 def_bool y 693 depends on (PPC64 && !NUMA) || PPC32 694 695config ARCH_SPARSEMEM_ENABLE 696 def_bool y 697 depends on PPC64 698 select SPARSEMEM_VMEMMAP_ENABLE 699 700config ARCH_SPARSEMEM_DEFAULT 701 def_bool y 702 depends on PPC_BOOK3S_64 703 704config ILLEGAL_POINTER_VALUE 705 hex 706 # This is roughly half way between the top of user space and the bottom 707 # of kernel space, which seems about as good as we can get. 708 default 0x5deadbeef0000000 if PPC64 709 default 0 710 711config ARCH_MEMORY_PROBE 712 def_bool y 713 depends on MEMORY_HOTPLUG 714 715choice 716 prompt "Page size" 717 default PPC_64K_PAGES if PPC_BOOK3S_64 718 default PPC_4K_PAGES 719 help 720 Select the kernel logical page size. Increasing the page size 721 will reduce software overhead at each page boundary, allow 722 hardware prefetch mechanisms to be more effective, and allow 723 larger dma transfers increasing IO efficiency and reducing 724 overhead. However the utilization of memory will increase. 725 For example, each cached file will using a multiple of the 726 page size to hold its contents and the difference between the 727 end of file and the end of page is wasted. 728 729 Some dedicated systems, such as software raid serving with 730 accelerated calculations, have shown significant increases. 731 732 If you configure a 64 bit kernel for 64k pages but the 733 processor does not support them, then the kernel will simulate 734 them with 4k pages, loading them on demand, but with the 735 reduced software overhead and larger internal fragmentation. 736 For the 32 bit kernel, a large page option will not be offered 737 unless it is supported by the configured processor. 738 739 If unsure, choose 4K_PAGES. 740 741config PPC_4K_PAGES 742 bool "4k page size" 743 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 744 745config PPC_16K_PAGES 746 bool "16k page size" 747 depends on 44x || PPC_8xx 748 749config PPC_64K_PAGES 750 bool "64k page size" 751 depends on 44x || PPC_BOOK3S_64 752 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 753 754config PPC_256K_PAGES 755 bool "256k page size (Requires non-standard binutils settings)" 756 depends on 44x && !PPC_47x 757 help 758 Make the page size 256k. 759 760 The kernel will only be able to run applications that have been 761 compiled with '-zmax-page-size' set to 256K (the default is 64K) using 762 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE 763 definition from 0x10000 to 0x40000 in older versions. 764 765endchoice 766 767config PAGE_SIZE_4KB 768 def_bool y 769 depends on PPC_4K_PAGES 770 771config PAGE_SIZE_16KB 772 def_bool y 773 depends on PPC_16K_PAGES 774 775config PAGE_SIZE_64KB 776 def_bool y 777 depends on PPC_64K_PAGES 778 779config PAGE_SIZE_256KB 780 def_bool y 781 depends on PPC_256K_PAGES 782 783config PPC_PAGE_SHIFT 784 int 785 default 18 if PPC_256K_PAGES 786 default 16 if PPC_64K_PAGES 787 default 14 if PPC_16K_PAGES 788 default 12 789 790config THREAD_SHIFT 791 int "Thread shift" if EXPERT 792 range 13 15 793 default "15" if PPC_256K_PAGES 794 default "14" if PPC64 795 default "13" 796 help 797 Used to define the stack size. The default is almost always what you 798 want. Only change this if you know what you are doing. 799 800config DATA_SHIFT_BOOL 801 bool "Set custom data alignment" 802 depends on ADVANCED_OPTIONS 803 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE 804 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX) || \ 805 FSL_BOOKE 806 help 807 This option allows you to set the kernel data alignment. When 808 RAM is mapped by blocks, the alignment needs to fit the size and 809 number of possible blocks. The default should be OK for most configs. 810 811 Say N here unless you know what you are doing. 812 813config DATA_SHIFT 814 int "Data shift" if DATA_SHIFT_BOOL 815 default 24 if STRICT_KERNEL_RWX && PPC64 816 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32 817 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx 818 range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_FSL_BOOKE 819 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32 820 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32 821 default 23 if STRICT_KERNEL_RWX && PPC_8xx 822 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA 823 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx 824 default 24 if STRICT_KERNEL_RWX && FSL_BOOKE 825 default PPC_PAGE_SHIFT 826 help 827 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO. 828 Smaller is the alignment, greater is the number of necessary DBATs. 829 830 On 8xx, large pages (512kb or 8M) are used to map kernel linear 831 memory. Aligning to 8M reduces TLB misses as only 8M pages are used 832 in that case. If PIN_TLB is selected, it must be aligned to 8M as 833 8M pages will be pinned. 834 835config FORCE_MAX_ZONEORDER 836 int "Maximum zone order" 837 range 8 9 if PPC64 && PPC_64K_PAGES 838 default "9" if PPC64 && PPC_64K_PAGES 839 range 13 13 if PPC64 && !PPC_64K_PAGES 840 default "13" if PPC64 && !PPC_64K_PAGES 841 range 9 64 if PPC32 && PPC_16K_PAGES 842 default "9" if PPC32 && PPC_16K_PAGES 843 range 7 64 if PPC32 && PPC_64K_PAGES 844 default "7" if PPC32 && PPC_64K_PAGES 845 range 5 64 if PPC32 && PPC_256K_PAGES 846 default "5" if PPC32 && PPC_256K_PAGES 847 range 11 64 848 default "11" 849 help 850 The kernel memory allocator divides physically contiguous memory 851 blocks into "zones", where each zone is a power of two number of 852 pages. This option selects the largest power of two that the kernel 853 keeps in the memory allocator. If you need to allocate very large 854 blocks of physically contiguous memory, then you may need to 855 increase this value. 856 857 This config option is actually maximum order plus one. For example, 858 a value of 11 means that the largest free memory block is 2^10 pages. 859 860 The page size is not necessarily 4KB. For example, on 64-bit 861 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep 862 this in mind when choosing a value for this option. 863 864config PPC_SUBPAGE_PROT 865 bool "Support setting protections for 4k subpages (subpage_prot syscall)" 866 default n 867 depends on PPC_64S_HASH_MMU && PPC_64K_PAGES 868 help 869 This option adds support for system call to allow user programs 870 to set access permissions (read/write, readonly, or no access) 871 on the 4k subpages of each 64k page. 872 873 If unsure, say N here. 874 875config PPC_PROT_SAO_LPAR 876 bool "Support PROT_SAO mappings in LPARs" 877 depends on PPC_BOOK3S_64 878 help 879 This option adds support for PROT_SAO mappings from userspace 880 inside LPARs on supported CPUs. 881 882 This may cause issues when performing guest migration from 883 a CPU that supports SAO to one that does not. 884 885 If unsure, say N here. 886 887config PPC_COPRO_BASE 888 bool 889 890config SCHED_SMT 891 bool "SMT (Hyperthreading) scheduler support" 892 depends on PPC64 && SMP 893 help 894 SMT scheduler support improves the CPU scheduler's decision making 895 when dealing with POWER5 cpus at a cost of slightly increased 896 overhead in some places. If unsure say N here. 897 898config PPC_DENORMALISATION 899 bool "PowerPC denormalisation exception handling" 900 depends on PPC_BOOK3S_64 901 default "y" if PPC_POWERNV 902 help 903 Add support for handling denormalisation of single precision 904 values. Useful for bare metal only. If unsure say Y here. 905 906config CMDLINE 907 string "Initial kernel command string" 908 default "" 909 help 910 On some platforms, there is currently no way for the boot loader to 911 pass arguments to the kernel. For these platforms, you can supply 912 some command-line options at build time by entering them here. In 913 most cases you will need to specify the root device here. 914 915choice 916 prompt "Kernel command line type" if CMDLINE != "" 917 default CMDLINE_FROM_BOOTLOADER 918 919config CMDLINE_FROM_BOOTLOADER 920 bool "Use bootloader kernel arguments if available" 921 help 922 Uses the command-line options passed by the boot loader. If 923 the boot loader doesn't provide any, the default kernel command 924 string provided in CMDLINE will be used. 925 926config CMDLINE_EXTEND 927 bool "Extend bootloader kernel arguments" 928 help 929 The command-line arguments provided by the boot loader will be 930 appended to the default kernel command string. 931 932config CMDLINE_FORCE 933 bool "Always use the default kernel command string" 934 help 935 Always use the default kernel command string, even if the boot 936 loader passes other arguments to the kernel. 937 This is useful if you cannot or don't want to change the 938 command-line options your boot loader passes to the kernel. 939 940endchoice 941 942config EXTRA_TARGETS 943 string "Additional default image types" 944 help 945 List additional targets to be built by the bootwrapper here (separated 946 by spaces). This is useful for targets that depend of device tree 947 files in the .dts directory. 948 949 Targets in this list will be build as part of the default build 950 target, or when the user does a 'make zImage' or a 951 'make zImage.initrd'. 952 953 If unsure, leave blank 954 955config ARCH_WANTS_FREEZER_CONTROL 956 def_bool y 957 depends on ADB_PMU 958 959source "kernel/power/Kconfig" 960 961config PPC_MEM_KEYS 962 prompt "PowerPC Memory Protection Keys" 963 def_bool y 964 depends on PPC_BOOK3S_64 965 depends on PPC_64S_HASH_MMU 966 select ARCH_USES_HIGH_VMA_FLAGS 967 select ARCH_HAS_PKEYS 968 help 969 Memory Protection Keys provides a mechanism for enforcing 970 page-based protections, but without requiring modification of the 971 page tables when an application changes protection domains. 972 973 For details, see Documentation/core-api/protection-keys.rst 974 975 If unsure, say y. 976 977config PPC_SECURE_BOOT 978 prompt "Enable secure boot support" 979 bool 980 depends on PPC_POWERNV || PPC_PSERIES 981 depends on IMA_ARCH_POLICY 982 imply IMA_SECURE_AND_OR_TRUSTED_BOOT 983 help 984 Systems with firmware secure boot enabled need to define security 985 policies to extend secure boot to the OS. This config allows a user 986 to enable OS secure boot on systems that have firmware support for 987 it. If in doubt say N. 988 989config PPC_SECVAR_SYSFS 990 bool "Enable sysfs interface for POWER secure variables" 991 default y 992 depends on PPC_SECURE_BOOT 993 depends on SYSFS 994 help 995 POWER secure variables are managed and controlled by firmware. 996 These variables are exposed to userspace via sysfs to enable 997 read/write operations on these variables. Say Y if you have 998 secure boot enabled and want to expose variables to userspace. 999 1000config PPC_RTAS_FILTER 1001 bool "Enable filtering of RTAS syscalls" 1002 default y 1003 depends on PPC_RTAS 1004 help 1005 The RTAS syscall API has security issues that could be used to 1006 compromise system integrity. This option enforces restrictions on the 1007 RTAS calls and arguments passed by userspace programs to mitigate 1008 these issues. 1009 1010 Say Y unless you know what you are doing and the filter is causing 1011 problems for you. 1012 1013endmenu 1014 1015config ISA_DMA_API 1016 bool 1017 default PCI 1018 1019menu "Bus options" 1020 1021config ISA 1022 bool "Support for ISA-bus hardware" 1023 depends on PPC_CHRP 1024 select PPC_I8259 1025 help 1026 Find out whether you have ISA slots on your motherboard. ISA is the 1027 name of a bus system, i.e. the way the CPU talks to the other stuff 1028 inside your box. If you have an Apple machine, say N here; if you 1029 have an IBM RS/6000 or pSeries machine, say Y. If you have an 1030 embedded board, consult your board documentation. 1031 1032config GENERIC_ISA_DMA 1033 bool 1034 depends on ISA_DMA_API 1035 default y 1036 1037config PPC_INDIRECT_PCI 1038 bool 1039 depends on PCI 1040 default y if 40x || 44x 1041 1042config SBUS 1043 bool 1044 1045config FSL_SOC 1046 bool 1047 1048config FSL_PCI 1049 bool 1050 select ARCH_HAS_DMA_SET_MASK 1051 select PPC_INDIRECT_PCI 1052 select PCI_QUIRKS 1053 1054config FSL_PMC 1055 bool 1056 default y 1057 depends on SUSPEND && (PPC_85xx || PPC_86xx) 1058 help 1059 Freescale MPC85xx/MPC86xx power management controller support 1060 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c 1061 1062config PPC4xx_CPM 1063 bool 1064 default y 1065 depends on SUSPEND && (44x || 40x) 1066 help 1067 PPC4xx Clock Power Management (CPM) support (suspend/resume). 1068 It also enables support for two different idle states (idle-wait 1069 and idle-doze). 1070 1071config 4xx_SOC 1072 bool 1073 1074config FSL_LBC 1075 bool "Freescale Local Bus support" 1076 help 1077 Enables reporting of errors from the Freescale local bus 1078 controller. Also contains some common code used by 1079 drivers for specific local bus peripherals. 1080 1081config FSL_GTM 1082 bool 1083 depends on PPC_83xx || QUICC_ENGINE || CPM2 1084 help 1085 Freescale General-purpose Timers support 1086 1087config PCI_8260 1088 bool 1089 depends on PCI && 8260 1090 select PPC_INDIRECT_PCI 1091 default y 1092 1093config FSL_RIO 1094 bool "Freescale Embedded SRIO Controller support" 1095 depends on RAPIDIO = y && HAVE_RAPIDIO 1096 default "n" 1097 help 1098 Include support for RapidIO controller on Freescale embedded 1099 processors (MPC8548, MPC8641, etc). 1100 1101endmenu 1102 1103config NONSTATIC_KERNEL 1104 bool 1105 1106menu "Advanced setup" 1107 depends on PPC32 1108 1109config ADVANCED_OPTIONS 1110 bool "Prompt for advanced kernel configuration options" 1111 help 1112 This option will enable prompting for a variety of advanced kernel 1113 configuration options. These options can cause the kernel to not 1114 work if they are set incorrectly, but can be used to optimize certain 1115 aspects of kernel memory management. 1116 1117 Unless you know what you are doing, say N here. 1118 1119comment "Default settings for advanced configuration options are used" 1120 depends on !ADVANCED_OPTIONS 1121 1122config LOWMEM_SIZE_BOOL 1123 bool "Set maximum low memory" 1124 depends on ADVANCED_OPTIONS 1125 help 1126 This option allows you to set the maximum amount of memory which 1127 will be used as "low memory", that is, memory which the kernel can 1128 access directly, without having to set up a kernel virtual mapping. 1129 This can be useful in optimizing the layout of kernel virtual 1130 memory. 1131 1132 Say N here unless you know what you are doing. 1133 1134config LOWMEM_SIZE 1135 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL 1136 default "0x30000000" 1137 1138config LOWMEM_CAM_NUM_BOOL 1139 bool "Set number of CAMs to use to map low memory" 1140 depends on ADVANCED_OPTIONS && FSL_BOOKE 1141 help 1142 This option allows you to set the maximum number of CAM slots that 1143 will be used to map low memory. There are a limited number of slots 1144 available and even more limited number that will fit in the L1 MMU. 1145 However, using more entries will allow mapping more low memory. This 1146 can be useful in optimizing the layout of kernel virtual memory. 1147 1148 Say N here unless you know what you are doing. 1149 1150config LOWMEM_CAM_NUM 1151 depends on FSL_BOOKE 1152 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL 1153 default 3 if !STRICT_KERNEL_RWX 1154 default 9 if DATA_SHIFT >= 24 1155 default 12 if DATA_SHIFT >= 22 1156 default 15 1157 1158config DYNAMIC_MEMSTART 1159 bool "Enable page aligned dynamic load address for kernel" 1160 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x) 1161 select NONSTATIC_KERNEL 1162 help 1163 This option enables the kernel to be loaded at any page aligned 1164 physical address. The kernel creates a mapping from KERNELBASE to 1165 the address where the kernel is loaded. The page size here implies 1166 the TLB page size of the mapping for kernel on the particular platform. 1167 Please refer to the init code for finding the TLB page size. 1168 1169 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE 1170 kernel image, where the only restriction is the page aligned kernel 1171 load address. When this option is enabled, the compile time physical 1172 address CONFIG_PHYSICAL_START is ignored. 1173 1174 This option is overridden by CONFIG_RELOCATABLE 1175 1176config PAGE_OFFSET_BOOL 1177 bool "Set custom page offset address" 1178 depends on ADVANCED_OPTIONS 1179 help 1180 This option allows you to set the kernel virtual address at which 1181 the kernel will map low memory. This can be useful in optimizing 1182 the virtual memory layout of the system. 1183 1184 Say N here unless you know what you are doing. 1185 1186config PAGE_OFFSET 1187 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL 1188 default "0xc0000000" 1189 1190config KERNEL_START_BOOL 1191 bool "Set custom kernel base address" 1192 depends on ADVANCED_OPTIONS 1193 help 1194 This option allows you to set the kernel virtual address at which 1195 the kernel will be loaded. Normally this should match PAGE_OFFSET 1196 however there are times (like kdump) that one might not want them 1197 to be the same. 1198 1199 Say N here unless you know what you are doing. 1200 1201config KERNEL_START 1202 hex "Virtual address of kernel base" if KERNEL_START_BOOL 1203 default PAGE_OFFSET if PAGE_OFFSET_BOOL 1204 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL 1205 default "0xc0000000" 1206 1207config PHYSICAL_START_BOOL 1208 bool "Set physical address where the kernel is loaded" 1209 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE 1210 help 1211 This gives the physical address where the kernel is loaded. 1212 1213 Say N here unless you know what you are doing. 1214 1215config PHYSICAL_START 1216 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL 1217 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL 1218 default "0x00000000" 1219 1220config PHYSICAL_ALIGN 1221 hex 1222 default "0x04000000" if FSL_BOOKE 1223 help 1224 This value puts the alignment restrictions on physical address 1225 where kernel is loaded and run from. Kernel is compiled for an 1226 address which meets above alignment restriction. 1227 1228config TASK_SIZE_BOOL 1229 bool "Set custom user task size" 1230 depends on ADVANCED_OPTIONS 1231 help 1232 This option allows you to set the amount of virtual address space 1233 allocated to user tasks. This can be useful in optimizing the 1234 virtual memory layout of the system. 1235 1236 Say N here unless you know what you are doing. 1237 1238config TASK_SIZE 1239 hex "Size of user task space" if TASK_SIZE_BOOL 1240 default "0x80000000" if PPC_8xx 1241 default "0xb0000000" if PPC_BOOK3S_32 1242 default "0xc0000000" 1243endmenu 1244 1245if PPC64 1246# This value must have zeroes in the bottom 60 bits otherwise lots will break 1247config PAGE_OFFSET 1248 hex 1249 default "0xc000000000000000" 1250config KERNEL_START 1251 hex 1252 default "0xc000000000000000" 1253config PHYSICAL_START 1254 hex 1255 default "0x00000000" 1256endif 1257 1258config PPC_LIB_RHEAP 1259 bool 1260 1261source "arch/powerpc/kvm/Kconfig" 1262 1263source "kernel/livepatch/Kconfig" 1264