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