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kernel / arch / powerpc / Kconfig
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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 if PPC_BOOK3E_64 196 select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN 197 select HAVE_ARCH_KFENCE if PPC_BOOK3S_32 || PPC_8xx || 40x 198 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET 199 select HAVE_ARCH_KGDB 200 select HAVE_ARCH_MMAP_RND_BITS 201 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT 202 select HAVE_ARCH_NVRAM_OPS 203 select HAVE_ARCH_SECCOMP_FILTER 204 select HAVE_ARCH_TRACEHOOK 205 select HAVE_ASM_MODVERSIONS 206 select HAVE_CONTEXT_TRACKING_USER if PPC64 207 select HAVE_C_RECORDMCOUNT 208 select HAVE_DEBUG_KMEMLEAK 209 select HAVE_DEBUG_STACKOVERFLOW 210 select HAVE_DYNAMIC_FTRACE 211 select HAVE_DYNAMIC_FTRACE_WITH_ARGS if MPROFILE_KERNEL || PPC32 212 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL || PPC32 213 select HAVE_EBPF_JIT 214 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU) 215 select HAVE_FAST_GUP 216 select HAVE_FTRACE_MCOUNT_RECORD 217 select HAVE_FUNCTION_DESCRIPTORS if PPC64_ELF_ABI_V1 218 select HAVE_FUNCTION_ERROR_INJECTION 219 select HAVE_FUNCTION_GRAPH_TRACER 220 select HAVE_FUNCTION_TRACER 221 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC 222 select HAVE_GENERIC_VDSO 223 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC_BOOK3S_64 && SMP 224 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH 225 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx) 226 select HAVE_IOREMAP_PROT 227 select HAVE_IRQ_TIME_ACCOUNTING 228 select HAVE_KERNEL_GZIP 229 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE 230 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE 231 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x 232 select HAVE_KPROBES 233 select HAVE_KPROBES_ON_FTRACE 234 select HAVE_KRETPROBES 235 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION 236 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS 237 select HAVE_MOD_ARCH_SPECIFIC 238 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S) 239 select HAVE_OPTPROBES 240 select HAVE_PERF_EVENTS 241 select HAVE_PERF_EVENTS_NMI if PPC64 242 select HAVE_PERF_REGS 243 select HAVE_PERF_USER_STACK_DUMP 244 select HAVE_REGS_AND_STACK_ACCESS_API 245 select HAVE_RELIABLE_STACKTRACE 246 select HAVE_RSEQ 247 select HAVE_SETUP_PER_CPU_AREA if PPC64 248 select HAVE_SOFTIRQ_ON_OWN_STACK 249 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2) 250 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13) 251 select HAVE_STATIC_CALL if PPC32 252 select HAVE_SYSCALL_TRACEPOINTS 253 select HAVE_VIRT_CPU_ACCOUNTING 254 select HUGETLB_PAGE_SIZE_VARIABLE if PPC_BOOK3S_64 && HUGETLB_PAGE 255 select IOMMU_HELPER if PPC64 256 select IRQ_DOMAIN 257 select IRQ_FORCED_THREADING 258 select KASAN_VMALLOC if KASAN && MODULES 259 select MMU_GATHER_PAGE_SIZE 260 select MMU_GATHER_RCU_TABLE_FREE 261 select MMU_GATHER_MERGE_VMAS 262 select MODULES_USE_ELF_RELA 263 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE 264 select NEED_PER_CPU_EMBED_FIRST_CHUNK if PPC64 265 select NEED_PER_CPU_PAGE_FIRST_CHUNK if PPC64 266 select NEED_SG_DMA_LENGTH 267 select OF 268 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE 269 select OF_EARLY_FLATTREE 270 select OLD_SIGACTION if PPC32 271 select OLD_SIGSUSPEND 272 select PCI_DOMAINS if PCI 273 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI 274 select PCI_SYSCALL if PCI 275 select PPC_DAWR if PPC64 276 select RTC_LIB 277 select SPARSE_IRQ 278 select STRICT_KERNEL_RWX if STRICT_MODULE_RWX 279 select SYSCTL_EXCEPTION_TRACE 280 select THREAD_INFO_IN_TASK 281 select TRACE_IRQFLAGS_SUPPORT 282 # 283 # Please keep this list sorted alphabetically. 284 # 285 286config PPC_LONG_DOUBLE_128 287 depends on PPC64 288 def_bool $(success,test "$(shell,echo __LONG_DOUBLE_128__ | $(CC) -E -P -)" = 1) 289 290config PPC_BARRIER_NOSPEC 291 bool 292 default y 293 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E 294 295config EARLY_PRINTK 296 bool 297 default y 298 299config PANIC_TIMEOUT 300 int 301 default 180 302 303config COMPAT 304 bool "Enable support for 32bit binaries" 305 depends on PPC64 306 depends on !CC_IS_CLANG || CLANG_VERSION >= 120000 307 default y if !CPU_LITTLE_ENDIAN 308 select ARCH_WANT_OLD_COMPAT_IPC 309 select COMPAT_OLD_SIGACTION 310 311config SCHED_OMIT_FRAME_POINTER 312 bool 313 default y 314 315config ARCH_MAY_HAVE_PC_FDC 316 bool 317 default PCI 318 319config PPC_UDBG_16550 320 bool 321 322config GENERIC_TBSYNC 323 bool 324 default y if PPC32 && SMP 325 326config AUDIT_ARCH 327 bool 328 default y 329 330config GENERIC_BUG 331 bool 332 default y 333 depends on BUG 334 335config GENERIC_BUG_RELATIVE_POINTERS 336 def_bool y 337 depends on GENERIC_BUG 338 339config SYS_SUPPORTS_APM_EMULATION 340 default y if PMAC_APM_EMU 341 bool 342 343config EPAPR_BOOT 344 bool 345 help 346 Used to allow a board to specify it wants an ePAPR compliant wrapper. 347 348config DEFAULT_UIMAGE 349 bool 350 help 351 Used to allow a board to specify it wants a uImage built by default 352 353config ARCH_HIBERNATION_POSSIBLE 354 bool 355 default y 356 357config ARCH_SUSPEND_POSSIBLE 358 def_bool y 359 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \ 360 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \ 361 || 44x || 40x 362 363config ARCH_SUSPEND_NONZERO_CPU 364 def_bool y 365 depends on PPC_POWERNV || PPC_PSERIES 366 367config ARCH_HAS_ADD_PAGES 368 def_bool y 369 depends on ARCH_ENABLE_MEMORY_HOTPLUG 370 371config PPC_DCR_NATIVE 372 bool 373 374config PPC_DCR_MMIO 375 bool 376 377config PPC_DCR 378 bool 379 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO 380 default y 381 382config PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT 383 depends on PPC32 384 depends on !PPC_PMAC && !PPC_CHRP 385 bool "Assign PCI bus numbers from zero individually for each PCI domain" 386 help 387 By default on PPC32 were PCI bus numbers unique across all PCI domains. 388 So system could have only 256 PCI buses independently of available 389 PCI domains. When this option is enabled then PCI bus numbers are 390 PCI domain dependent and each PCI controller on own domain can have 391 256 PCI buses, like it is on other Linux architectures. 392 393config PPC_OF_PLATFORM_PCI 394 bool 395 depends on PCI 396 depends on PPC64 # not supported on 32 bits yet 397 398config ARCH_SUPPORTS_UPROBES 399 def_bool y 400 401config PPC_ADV_DEBUG_REGS 402 bool 403 depends on 40x || BOOKE 404 default y 405 406config PPC_ADV_DEBUG_IACS 407 int 408 depends on PPC_ADV_DEBUG_REGS 409 default 4 if 44x 410 default 2 411 412config PPC_ADV_DEBUG_DACS 413 int 414 depends on PPC_ADV_DEBUG_REGS 415 default 2 416 417config PPC_ADV_DEBUG_DVCS 418 int 419 depends on PPC_ADV_DEBUG_REGS 420 default 2 if 44x 421 default 0 422 423config PPC_ADV_DEBUG_DAC_RANGE 424 bool 425 depends on PPC_ADV_DEBUG_REGS && 44x 426 default y 427 428config PPC_DAWR 429 bool 430 431config PGTABLE_LEVELS 432 int 433 default 2 if !PPC64 434 default 4 435 436source "arch/powerpc/sysdev/Kconfig" 437source "arch/powerpc/platforms/Kconfig" 438 439menu "Kernel options" 440 441config HIGHMEM 442 bool "High memory support" 443 depends on PPC32 444 select KMAP_LOCAL 445 446source "kernel/Kconfig.hz" 447 448config MATH_EMULATION 449 bool "Math emulation" 450 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT 451 select PPC_FPU_REGS 452 help 453 Some PowerPC chips designed for embedded applications do not have 454 a floating-point unit and therefore do not implement the 455 floating-point instructions in the PowerPC instruction set. If you 456 say Y here, the kernel will include code to emulate a floating-point 457 unit, which will allow programs that use floating-point 458 instructions to run. 459 460 This is also useful to emulate missing (optional) instructions 461 such as fsqrt on cores that do have an FPU but do not implement 462 them (such as Freescale BookE). 463 464choice 465 prompt "Math emulation options" 466 default MATH_EMULATION_FULL 467 depends on MATH_EMULATION 468 469config MATH_EMULATION_FULL 470 bool "Emulate all the floating point instructions" 471 help 472 Select this option will enable the kernel to support to emulate 473 all the floating point instructions. If your SoC doesn't have 474 a FPU, you should select this. 475 476config MATH_EMULATION_HW_UNIMPLEMENTED 477 bool "Just emulate the FPU unimplemented instructions" 478 help 479 Select this if you know there does have a hardware FPU on your 480 SoC, but some floating point instructions are not implemented by that. 481 482endchoice 483 484config PPC_TRANSACTIONAL_MEM 485 bool "Transactional Memory support for POWERPC" 486 depends on PPC_BOOK3S_64 487 depends on SMP 488 select ALTIVEC 489 select VSX 490 help 491 Support user-mode Transactional Memory on POWERPC. 492 493config PPC_UV 494 bool "Ultravisor support" 495 depends on KVM_BOOK3S_HV_POSSIBLE 496 depends on DEVICE_PRIVATE 497 default n 498 help 499 This option paravirtualizes the kernel to run in POWER platforms that 500 supports the Protected Execution Facility (PEF). On such platforms, 501 the ultravisor firmware runs at a privilege level above the 502 hypervisor. 503 504 If unsure, say "N". 505 506config LD_HEAD_STUB_CATCH 507 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT 508 depends on PPC64 509 help 510 Very large kernels can cause linker branch stubs to be generated by 511 code in head_64.S, which moves the head text sections out of their 512 specified location. This option can work around the problem. 513 514 If unsure, say "N". 515 516config MPROFILE_KERNEL 517 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER 518 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__) 519 520config HOTPLUG_CPU 521 bool "Support for enabling/disabling CPUs" 522 depends on SMP && (PPC_PSERIES || \ 523 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE) 524 help 525 Say Y here to be able to disable and re-enable individual 526 CPUs at runtime on SMP machines. 527 528 Say N if you are unsure. 529 530config PPC_QUEUED_SPINLOCKS 531 bool "Queued spinlocks" if EXPERT 532 depends on SMP 533 default PPC_BOOK3S_64 534 help 535 Say Y here to use queued spinlocks which give better scalability and 536 fairness on large SMP and NUMA systems without harming single threaded 537 performance. 538 539config ARCH_CPU_PROBE_RELEASE 540 def_bool y 541 depends on HOTPLUG_CPU 542 543config PPC64_SUPPORTS_MEMORY_FAILURE 544 bool "Add support for memory hwpoison" 545 depends on PPC_BOOK3S_64 546 default "y" if PPC_POWERNV 547 select ARCH_SUPPORTS_MEMORY_FAILURE 548 549config KEXEC 550 bool "kexec system call" 551 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E 552 select KEXEC_CORE 553 help 554 kexec is a system call that implements the ability to shutdown your 555 current kernel, and to start another kernel. It is like a reboot 556 but it is independent of the system firmware. And like a reboot 557 you can start any kernel with it, not just Linux. 558 559 The name comes from the similarity to the exec system call. 560 561 It is an ongoing process to be certain the hardware in a machine 562 is properly shutdown, so do not be surprised if this code does not 563 initially work for you. As of this writing the exact hardware 564 interface is strongly in flux, so no good recommendation can be 565 made. 566 567config KEXEC_FILE 568 bool "kexec file based system call" 569 select KEXEC_CORE 570 select HAVE_IMA_KEXEC if IMA 571 select KEXEC_ELF 572 depends on PPC64 573 depends on CRYPTO=y 574 depends on CRYPTO_SHA256=y 575 help 576 This is a new version of the kexec system call. This call is 577 file based and takes in file descriptors as system call arguments 578 for kernel and initramfs as opposed to a list of segments as is the 579 case for the older kexec call. 580 581config ARCH_HAS_KEXEC_PURGATORY 582 def_bool KEXEC_FILE 583 584config RELOCATABLE 585 bool "Build a relocatable kernel" 586 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE)) 587 select NONSTATIC_KERNEL 588 help 589 This builds a kernel image that is capable of running at the 590 location the kernel is loaded at. For ppc32, there is no any 591 alignment restrictions, and this feature is a superset of 592 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use 593 16k-aligned base address. The kernel is linked as a 594 position-independent executable (PIE) and contains dynamic relocations 595 which are processed early in the bootup process. 596 597 One use is for the kexec on panic case where the recovery kernel 598 must live at a different physical address than the primary 599 kernel. 600 601 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address 602 it has been loaded at and the compile time physical addresses 603 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START 604 setting can still be useful to bootwrappers that need to know the 605 load address of the kernel (eg. u-boot/mkimage). 606 607config RANDOMIZE_BASE 608 bool "Randomize the address of the kernel image" 609 depends on (FSL_BOOKE && FLATMEM && PPC32) 610 depends on RELOCATABLE 611 help 612 Randomizes the virtual address at which the kernel image is 613 loaded, as a security feature that deters exploit attempts 614 relying on knowledge of the location of kernel internals. 615 616 If unsure, say Y. 617 618config RELOCATABLE_TEST 619 bool "Test relocatable kernel" 620 depends on (PPC64 && RELOCATABLE) 621 help 622 This runs the relocatable kernel at the address it was initially 623 loaded at, which tends to be non-zero and therefore test the 624 relocation code. 625 626config CRASH_DUMP 627 bool "Build a dump capture kernel" 628 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP) 629 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE 630 help 631 Build a kernel suitable for use as a dump capture kernel. 632 The same kernel binary can be used as production kernel and dump 633 capture kernel. 634 635config FA_DUMP 636 bool "Firmware-assisted dump" 637 depends on PPC64 && (PPC_RTAS || PPC_POWERNV) 638 select CRASH_CORE 639 select CRASH_DUMP 640 help 641 A robust mechanism to get reliable kernel crash dump with 642 assistance from firmware. This approach does not use kexec, 643 instead firmware assists in booting the capture kernel 644 while preserving memory contents. Firmware-assisted dump 645 is meant to be a kdump replacement offering robustness and 646 speed not possible without system firmware assistance. 647 648 If unsure, say "y". Only special kernels like petitboot may 649 need to say "N" here. 650 651config PRESERVE_FA_DUMP 652 bool "Preserve Firmware-assisted dump" 653 depends on PPC64 && PPC_POWERNV && !FA_DUMP 654 help 655 On a kernel with FA_DUMP disabled, this option helps to preserve 656 crash data from a previously crash'ed kernel. Useful when the next 657 memory preserving kernel boot would process this crash data. 658 Petitboot kernel is the typical usecase for this option. 659 660config OPAL_CORE 661 bool "Export OPAL memory as /sys/firmware/opal/core" 662 depends on PPC64 && PPC_POWERNV 663 help 664 This option uses the MPIPL support in firmware to provide an 665 ELF core of OPAL memory after a crash. The ELF core is exported 666 as /sys/firmware/opal/core file which is helpful in debugging 667 OPAL crashes using GDB. 668 669config IRQ_ALL_CPUS 670 bool "Distribute interrupts on all CPUs by default" 671 depends on SMP 672 help 673 This option gives the kernel permission to distribute IRQs across 674 multiple CPUs. Saying N here will route all IRQs to the first 675 CPU. Generally saying Y is safe, although some problems have been 676 reported with SMP Power Macintoshes with this option enabled. 677 678config NUMA 679 bool "NUMA Memory Allocation and Scheduler Support" 680 depends on PPC64 && SMP 681 default y if PPC_PSERIES || PPC_POWERNV 682 select USE_PERCPU_NUMA_NODE_ID 683 help 684 Enable NUMA (Non-Uniform Memory Access) support. 685 686 The kernel will try to allocate memory used by a CPU on the 687 local memory controller of the CPU and add some more 688 NUMA awareness to the kernel. 689 690config NODES_SHIFT 691 int 692 default "8" if PPC64 693 default "4" 694 depends on NUMA 695 696config HAVE_MEMORYLESS_NODES 697 def_bool y 698 depends on NUMA 699 700config ARCH_SELECT_MEMORY_MODEL 701 def_bool y 702 depends on PPC64 703 704config ARCH_FLATMEM_ENABLE 705 def_bool y 706 depends on (PPC64 && !NUMA) || PPC32 707 708config ARCH_SPARSEMEM_ENABLE 709 def_bool y 710 depends on PPC64 711 select SPARSEMEM_VMEMMAP_ENABLE 712 713config ARCH_SPARSEMEM_DEFAULT 714 def_bool y 715 depends on PPC_BOOK3S_64 716 717config ILLEGAL_POINTER_VALUE 718 hex 719 # This is roughly half way between the top of user space and the bottom 720 # of kernel space, which seems about as good as we can get. 721 default 0x5deadbeef0000000 if PPC64 722 default 0 723 724config ARCH_MEMORY_PROBE 725 def_bool y 726 depends on MEMORY_HOTPLUG 727 728choice 729 prompt "Page size" 730 default PPC_64K_PAGES if PPC_BOOK3S_64 731 default PPC_4K_PAGES 732 help 733 Select the kernel logical page size. Increasing the page size 734 will reduce software overhead at each page boundary, allow 735 hardware prefetch mechanisms to be more effective, and allow 736 larger dma transfers increasing IO efficiency and reducing 737 overhead. However the utilization of memory will increase. 738 For example, each cached file will using a multiple of the 739 page size to hold its contents and the difference between the 740 end of file and the end of page is wasted. 741 742 Some dedicated systems, such as software raid serving with 743 accelerated calculations, have shown significant increases. 744 745 If you configure a 64 bit kernel for 64k pages but the 746 processor does not support them, then the kernel will simulate 747 them with 4k pages, loading them on demand, but with the 748 reduced software overhead and larger internal fragmentation. 749 For the 32 bit kernel, a large page option will not be offered 750 unless it is supported by the configured processor. 751 752 If unsure, choose 4K_PAGES. 753 754config PPC_4K_PAGES 755 bool "4k page size" 756 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 757 758config PPC_16K_PAGES 759 bool "16k page size" 760 depends on 44x || PPC_8xx 761 762config PPC_64K_PAGES 763 bool "64k page size" 764 depends on 44x || PPC_BOOK3S_64 765 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64 766 767config PPC_256K_PAGES 768 bool "256k page size (Requires non-standard binutils settings)" 769 depends on 44x && !PPC_47x 770 help 771 Make the page size 256k. 772 773 The kernel will only be able to run applications that have been 774 compiled with '-zmax-page-size' set to 256K (the default is 64K) using 775 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE 776 definition from 0x10000 to 0x40000 in older versions. 777 778endchoice 779 780config PAGE_SIZE_4KB 781 def_bool y 782 depends on PPC_4K_PAGES 783 784config PAGE_SIZE_16KB 785 def_bool y 786 depends on PPC_16K_PAGES 787 788config PAGE_SIZE_64KB 789 def_bool y 790 depends on PPC_64K_PAGES 791 792config PAGE_SIZE_256KB 793 def_bool y 794 depends on PPC_256K_PAGES 795 796config PPC_PAGE_SHIFT 797 int 798 default 18 if PPC_256K_PAGES 799 default 16 if PPC_64K_PAGES 800 default 14 if PPC_16K_PAGES 801 default 12 802 803config THREAD_SHIFT 804 int "Thread shift" if EXPERT 805 range 13 15 806 default "15" if PPC_256K_PAGES 807 default "14" if PPC64 808 default "13" 809 help 810 Used to define the stack size. The default is almost always what you 811 want. Only change this if you know what you are doing. 812 813config DATA_SHIFT_BOOL 814 bool "Set custom data alignment" 815 depends on ADVANCED_OPTIONS 816 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE 817 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX) || \ 818 FSL_BOOKE 819 help 820 This option allows you to set the kernel data alignment. When 821 RAM is mapped by blocks, the alignment needs to fit the size and 822 number of possible blocks. The default should be OK for most configs. 823 824 Say N here unless you know what you are doing. 825 826config DATA_SHIFT 827 int "Data shift" if DATA_SHIFT_BOOL 828 default 24 if STRICT_KERNEL_RWX && PPC64 829 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32 830 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx 831 range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_FSL_BOOKE 832 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32 833 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32 834 default 23 if STRICT_KERNEL_RWX && PPC_8xx 835 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA 836 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx 837 default 24 if STRICT_KERNEL_RWX && FSL_BOOKE 838 default PPC_PAGE_SHIFT 839 help 840 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO. 841 Smaller is the alignment, greater is the number of necessary DBATs. 842 843 On 8xx, large pages (512kb or 8M) are used to map kernel linear 844 memory. Aligning to 8M reduces TLB misses as only 8M pages are used 845 in that case. If PIN_TLB is selected, it must be aligned to 8M as 846 8M pages will be pinned. 847 848config FORCE_MAX_ZONEORDER 849 int "Maximum zone order" 850 range 8 9 if PPC64 && PPC_64K_PAGES 851 default "9" if PPC64 && PPC_64K_PAGES 852 range 13 13 if PPC64 && !PPC_64K_PAGES 853 default "13" if PPC64 && !PPC_64K_PAGES 854 range 9 64 if PPC32 && PPC_16K_PAGES 855 default "9" if PPC32 && PPC_16K_PAGES 856 range 7 64 if PPC32 && PPC_64K_PAGES 857 default "7" if PPC32 && PPC_64K_PAGES 858 range 5 64 if PPC32 && PPC_256K_PAGES 859 default "5" if PPC32 && PPC_256K_PAGES 860 range 11 64 861 default "11" 862 help 863 The kernel memory allocator divides physically contiguous memory 864 blocks into "zones", where each zone is a power of two number of 865 pages. This option selects the largest power of two that the kernel 866 keeps in the memory allocator. If you need to allocate very large 867 blocks of physically contiguous memory, then you may need to 868 increase this value. 869 870 This config option is actually maximum order plus one. For example, 871 a value of 11 means that the largest free memory block is 2^10 pages. 872 873 The page size is not necessarily 4KB. For example, on 64-bit 874 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep 875 this in mind when choosing a value for this option. 876 877config PPC_SUBPAGE_PROT 878 bool "Support setting protections for 4k subpages (subpage_prot syscall)" 879 default n 880 depends on PPC_64S_HASH_MMU && PPC_64K_PAGES 881 help 882 This option adds support for system call to allow user programs 883 to set access permissions (read/write, readonly, or no access) 884 on the 4k subpages of each 64k page. 885 886 If unsure, say N here. 887 888config PPC_PROT_SAO_LPAR 889 bool "Support PROT_SAO mappings in LPARs" 890 depends on PPC_BOOK3S_64 891 help 892 This option adds support for PROT_SAO mappings from userspace 893 inside LPARs on supported CPUs. 894 895 This may cause issues when performing guest migration from 896 a CPU that supports SAO to one that does not. 897 898 If unsure, say N here. 899 900config PPC_COPRO_BASE 901 bool 902 903config SCHED_SMT 904 bool "SMT (Hyperthreading) scheduler support" 905 depends on PPC64 && SMP 906 help 907 SMT scheduler support improves the CPU scheduler's decision making 908 when dealing with POWER5 cpus at a cost of slightly increased 909 overhead in some places. If unsure say N here. 910 911config PPC_DENORMALISATION 912 bool "PowerPC denormalisation exception handling" 913 depends on PPC_BOOK3S_64 914 default "y" if PPC_POWERNV 915 help 916 Add support for handling denormalisation of single precision 917 values. Useful for bare metal only. If unsure say Y here. 918 919config CMDLINE 920 string "Initial kernel command string" 921 default "" 922 help 923 On some platforms, there is currently no way for the boot loader to 924 pass arguments to the kernel. For these platforms, you can supply 925 some command-line options at build time by entering them here. In 926 most cases you will need to specify the root device here. 927 928choice 929 prompt "Kernel command line type" if CMDLINE != "" 930 default CMDLINE_FROM_BOOTLOADER 931 932config CMDLINE_FROM_BOOTLOADER 933 bool "Use bootloader kernel arguments if available" 934 help 935 Uses the command-line options passed by the boot loader. If 936 the boot loader doesn't provide any, the default kernel command 937 string provided in CMDLINE will be used. 938 939config CMDLINE_EXTEND 940 bool "Extend bootloader kernel arguments" 941 help 942 The command-line arguments provided by the boot loader will be 943 appended to the default kernel command string. 944 945config CMDLINE_FORCE 946 bool "Always use the default kernel command string" 947 help 948 Always use the default kernel command string, even if the boot 949 loader passes other arguments to the kernel. 950 This is useful if you cannot or don't want to change the 951 command-line options your boot loader passes to the kernel. 952 953endchoice 954 955config EXTRA_TARGETS 956 string "Additional default image types" 957 help 958 List additional targets to be built by the bootwrapper here (separated 959 by spaces). This is useful for targets that depend of device tree 960 files in the .dts directory. 961 962 Targets in this list will be build as part of the default build 963 target, or when the user does a 'make zImage' or a 964 'make zImage.initrd'. 965 966 If unsure, leave blank 967 968config ARCH_WANTS_FREEZER_CONTROL 969 def_bool y 970 depends on ADB_PMU 971 972source "kernel/power/Kconfig" 973 974config PPC_MEM_KEYS 975 prompt "PowerPC Memory Protection Keys" 976 def_bool y 977 depends on PPC_BOOK3S_64 978 depends on PPC_64S_HASH_MMU 979 select ARCH_USES_HIGH_VMA_FLAGS 980 select ARCH_HAS_PKEYS 981 help 982 Memory Protection Keys provides a mechanism for enforcing 983 page-based protections, but without requiring modification of the 984 page tables when an application changes protection domains. 985 986 For details, see Documentation/core-api/protection-keys.rst 987 988 If unsure, say y. 989 990config PPC_SECURE_BOOT 991 prompt "Enable secure boot support" 992 bool 993 depends on PPC_POWERNV || PPC_PSERIES 994 depends on IMA_ARCH_POLICY 995 imply IMA_SECURE_AND_OR_TRUSTED_BOOT 996 help 997 Systems with firmware secure boot enabled need to define security 998 policies to extend secure boot to the OS. This config allows a user 999 to enable OS secure boot on systems that have firmware support for 1000 it. If in doubt say N. 1001 1002config PPC_SECVAR_SYSFS 1003 bool "Enable sysfs interface for POWER secure variables" 1004 default y 1005 depends on PPC_SECURE_BOOT 1006 depends on SYSFS 1007 help 1008 POWER secure variables are managed and controlled by firmware. 1009 These variables are exposed to userspace via sysfs to enable 1010 read/write operations on these variables. Say Y if you have 1011 secure boot enabled and want to expose variables to userspace. 1012 1013config PPC_RTAS_FILTER 1014 bool "Enable filtering of RTAS syscalls" 1015 default y 1016 depends on PPC_RTAS 1017 help 1018 The RTAS syscall API has security issues that could be used to 1019 compromise system integrity. This option enforces restrictions on the 1020 RTAS calls and arguments passed by userspace programs to mitigate 1021 these issues. 1022 1023 Say Y unless you know what you are doing and the filter is causing 1024 problems for you. 1025 1026endmenu 1027 1028config ISA_DMA_API 1029 bool 1030 default PCI 1031 1032menu "Bus options" 1033 1034config ISA 1035 bool "Support for ISA-bus hardware" 1036 depends on PPC_CHRP 1037 select PPC_I8259 1038 help 1039 Find out whether you have ISA slots on your motherboard. ISA is the 1040 name of a bus system, i.e. the way the CPU talks to the other stuff 1041 inside your box. If you have an Apple machine, say N here; if you 1042 have an IBM RS/6000 or pSeries machine, say Y. If you have an 1043 embedded board, consult your board documentation. 1044 1045config GENERIC_ISA_DMA 1046 bool 1047 depends on ISA_DMA_API 1048 default y 1049 1050config PPC_INDIRECT_PCI 1051 bool 1052 depends on PCI 1053 default y if 40x || 44x 1054 1055config SBUS 1056 bool 1057 1058config FSL_SOC 1059 bool 1060 1061config FSL_PCI 1062 bool 1063 select ARCH_HAS_DMA_SET_MASK 1064 select PPC_INDIRECT_PCI 1065 select PCI_QUIRKS 1066 1067config FSL_PMC 1068 bool 1069 default y 1070 depends on SUSPEND && (PPC_85xx || PPC_86xx) 1071 help 1072 Freescale MPC85xx/MPC86xx power management controller support 1073 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c 1074 1075config PPC4xx_CPM 1076 bool 1077 default y 1078 depends on SUSPEND && (44x || 40x) 1079 help 1080 PPC4xx Clock Power Management (CPM) support (suspend/resume). 1081 It also enables support for two different idle states (idle-wait 1082 and idle-doze). 1083 1084config 4xx_SOC 1085 bool 1086 1087config FSL_LBC 1088 bool "Freescale Local Bus support" 1089 help 1090 Enables reporting of errors from the Freescale local bus 1091 controller. Also contains some common code used by 1092 drivers for specific local bus peripherals. 1093 1094config FSL_GTM 1095 bool 1096 depends on PPC_83xx || QUICC_ENGINE || CPM2 1097 help 1098 Freescale General-purpose Timers support 1099 1100config PCI_8260 1101 bool 1102 depends on PCI && 8260 1103 select PPC_INDIRECT_PCI 1104 default y 1105 1106config FSL_RIO 1107 bool "Freescale Embedded SRIO Controller support" 1108 depends on RAPIDIO = y && HAVE_RAPIDIO 1109 default "n" 1110 help 1111 Include support for RapidIO controller on Freescale embedded 1112 processors (MPC8548, MPC8641, etc). 1113 1114endmenu 1115 1116config NONSTATIC_KERNEL 1117 bool 1118 1119menu "Advanced setup" 1120 depends on PPC32 1121 1122config ADVANCED_OPTIONS 1123 bool "Prompt for advanced kernel configuration options" 1124 help 1125 This option will enable prompting for a variety of advanced kernel 1126 configuration options. These options can cause the kernel to not 1127 work if they are set incorrectly, but can be used to optimize certain 1128 aspects of kernel memory management. 1129 1130 Unless you know what you are doing, say N here. 1131 1132comment "Default settings for advanced configuration options are used" 1133 depends on !ADVANCED_OPTIONS 1134 1135config LOWMEM_SIZE_BOOL 1136 bool "Set maximum low memory" 1137 depends on ADVANCED_OPTIONS 1138 help 1139 This option allows you to set the maximum amount of memory which 1140 will be used as "low memory", that is, memory which the kernel can 1141 access directly, without having to set up a kernel virtual mapping. 1142 This can be useful in optimizing the layout of kernel virtual 1143 memory. 1144 1145 Say N here unless you know what you are doing. 1146 1147config LOWMEM_SIZE 1148 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL 1149 default "0x30000000" 1150 1151config LOWMEM_CAM_NUM_BOOL 1152 bool "Set number of CAMs to use to map low memory" 1153 depends on ADVANCED_OPTIONS && FSL_BOOKE 1154 help 1155 This option allows you to set the maximum number of CAM slots that 1156 will be used to map low memory. There are a limited number of slots 1157 available and even more limited number that will fit in the L1 MMU. 1158 However, using more entries will allow mapping more low memory. This 1159 can be useful in optimizing the layout of kernel virtual memory. 1160 1161 Say N here unless you know what you are doing. 1162 1163config LOWMEM_CAM_NUM 1164 depends on FSL_BOOKE 1165 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL 1166 default 3 if !STRICT_KERNEL_RWX 1167 default 9 if DATA_SHIFT >= 24 1168 default 12 if DATA_SHIFT >= 22 1169 default 15 1170 1171config DYNAMIC_MEMSTART 1172 bool "Enable page aligned dynamic load address for kernel" 1173 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x) 1174 select NONSTATIC_KERNEL 1175 help 1176 This option enables the kernel to be loaded at any page aligned 1177 physical address. The kernel creates a mapping from KERNELBASE to 1178 the address where the kernel is loaded. The page size here implies 1179 the TLB page size of the mapping for kernel on the particular platform. 1180 Please refer to the init code for finding the TLB page size. 1181 1182 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE 1183 kernel image, where the only restriction is the page aligned kernel 1184 load address. When this option is enabled, the compile time physical 1185 address CONFIG_PHYSICAL_START is ignored. 1186 1187 This option is overridden by CONFIG_RELOCATABLE 1188 1189config PAGE_OFFSET_BOOL 1190 bool "Set custom page offset address" 1191 depends on ADVANCED_OPTIONS 1192 help 1193 This option allows you to set the kernel virtual address at which 1194 the kernel will map low memory. This can be useful in optimizing 1195 the virtual memory layout of the system. 1196 1197 Say N here unless you know what you are doing. 1198 1199config PAGE_OFFSET 1200 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL 1201 default "0xc0000000" 1202 1203config KERNEL_START_BOOL 1204 bool "Set custom kernel base address" 1205 depends on ADVANCED_OPTIONS 1206 help 1207 This option allows you to set the kernel virtual address at which 1208 the kernel will be loaded. Normally this should match PAGE_OFFSET 1209 however there are times (like kdump) that one might not want them 1210 to be the same. 1211 1212 Say N here unless you know what you are doing. 1213 1214config KERNEL_START 1215 hex "Virtual address of kernel base" if KERNEL_START_BOOL 1216 default PAGE_OFFSET if PAGE_OFFSET_BOOL 1217 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL 1218 default "0xc0000000" 1219 1220config PHYSICAL_START_BOOL 1221 bool "Set physical address where the kernel is loaded" 1222 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE 1223 help 1224 This gives the physical address where the kernel is loaded. 1225 1226 Say N here unless you know what you are doing. 1227 1228config PHYSICAL_START 1229 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL 1230 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL 1231 default "0x00000000" 1232 1233config PHYSICAL_ALIGN 1234 hex 1235 default "0x04000000" if FSL_BOOKE 1236 help 1237 This value puts the alignment restrictions on physical address 1238 where kernel is loaded and run from. Kernel is compiled for an 1239 address which meets above alignment restriction. 1240 1241config TASK_SIZE_BOOL 1242 bool "Set custom user task size" 1243 depends on ADVANCED_OPTIONS 1244 help 1245 This option allows you to set the amount of virtual address space 1246 allocated to user tasks. This can be useful in optimizing the 1247 virtual memory layout of the system. 1248 1249 Say N here unless you know what you are doing. 1250 1251config TASK_SIZE 1252 hex "Size of user task space" if TASK_SIZE_BOOL 1253 default "0x80000000" if PPC_8xx 1254 default "0xb0000000" if PPC_BOOK3S_32 1255 default "0xc0000000" 1256endmenu 1257 1258if PPC64 1259# This value must have zeroes in the bottom 60 bits otherwise lots will break 1260config PAGE_OFFSET 1261 hex 1262 default "0xc000000000000000" 1263config KERNEL_START 1264 hex 1265 default "0xc000000000000000" 1266config PHYSICAL_START 1267 hex 1268 default "0x00000000" 1269endif 1270 1271config PPC_LIB_RHEAP 1272 bool 1273 1274source "arch/powerpc/kvm/Kconfig" 1275 1276source "kernel/livepatch/Kconfig"