0001 # SPDX-License-Identifier: GPL-2.0
0002 source "arch/powerpc/platforms/Kconfig.cputype"
0003
0004 config 32BIT
0005 bool
0006 default y if PPC32
0007
0008 config 64BIT
0009 bool
0010 default y if PPC64
0011
0012 config LIVEPATCH_64
0013 def_bool PPC64
0014 depends on LIVEPATCH
0015
0016 config MMU
0017 bool
0018 default y
0019
0020 config ARCH_MMAP_RND_BITS_MAX
0021 # On Book3S 64, the default virtual address space for 64-bit processes
0022 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
0023 # 32T of address space (2^45), which should ensure a reasonable gap
0024 # between bottom-up and top-down allocations for applications that
0025 # consume "normal" amounts of address space. Book3S 64 only supports 64K
0026 # and 4K page sizes.
0027 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
0028 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K)
0029 #
0030 # On all other 64-bit platforms (currently only Book3E), the virtual
0031 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
0032 # of address space (2^44). Only 4K page sizes are supported.
0033 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K)
0034 #
0035 # For 32-bit, use the compat values, as they're the same.
0036 default ARCH_MMAP_RND_COMPAT_BITS_MAX
0037
0038 config ARCH_MMAP_RND_BITS_MIN
0039 # Allow randomisation to consume up to 1GB of address space (2^30).
0040 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K)
0041 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K)
0042 #
0043 # For 32-bit, use the compat values, as they're the same.
0044 default ARCH_MMAP_RND_COMPAT_BITS_MIN
0045
0046 config ARCH_MMAP_RND_COMPAT_BITS_MAX
0047 # Total virtual address space for 32-bit processes is 2^31 (2GB).
0048 # Allow randomisation to consume up to 512MB of address space (2^29).
0049 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K)
0050 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K)
0051 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K)
0052 default 17 # 17 = 29 (512MB) - 12 (4K)
0053
0054 config ARCH_MMAP_RND_COMPAT_BITS_MIN
0055 # Total virtual address space for 32-bit processes is 2^31 (2GB).
0056 # Allow randomisation to consume up to 8MB of address space (2^23).
0057 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K)
0058 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K)
0059 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K)
0060 default 11 # 11 = 23 (8MB) - 12 (4K)
0061
0062 config NR_IRQS
0063 int "Number of virtual interrupt numbers"
0064 range 32 1048576
0065 default "512"
0066 help
0067 This defines the number of virtual interrupt numbers the kernel
0068 can manage. Virtual interrupt numbers are what you see in
0069 /proc/interrupts. If you configure your system to have too few,
0070 drivers will fail to load or worse - handle with care.
0071
0072 config NMI_IPI
0073 bool
0074 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
0075 default y
0076
0077 config PPC_WATCHDOG
0078 bool
0079 depends on HARDLOCKUP_DETECTOR
0080 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
0081 default y
0082 help
0083 This is a placeholder when the powerpc hardlockup detector
0084 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
0085 selected via the generic lockup detector menu which is why we
0086 have no standalone config option for it here.
0087
0088 config STACKTRACE_SUPPORT
0089 bool
0090 default y
0091
0092 config LOCKDEP_SUPPORT
0093 bool
0094 default y
0095
0096 config GENERIC_LOCKBREAK
0097 bool
0098 default y
0099 depends on SMP && PREEMPTION
0100
0101 config GENERIC_HWEIGHT
0102 bool
0103 default y
0104
0105 config PPC
0106 bool
0107 default y
0108 #
0109 # Please keep this list sorted alphabetically.
0110 #
0111 select ARCH_32BIT_OFF_T if PPC32
0112 select ARCH_DISABLE_KASAN_INLINE if PPC_RADIX_MMU
0113 select ARCH_ENABLE_MEMORY_HOTPLUG
0114 select ARCH_ENABLE_MEMORY_HOTREMOVE
0115 select ARCH_HAS_COPY_MC if PPC64
0116 select ARCH_HAS_CURRENT_STACK_POINTER
0117 select ARCH_HAS_DEBUG_VIRTUAL
0118 select ARCH_HAS_DEBUG_VM_PGTABLE
0119 select ARCH_HAS_DEBUG_WX if STRICT_KERNEL_RWX
0120 select ARCH_HAS_DEVMEM_IS_ALLOWED
0121 select ARCH_HAS_DMA_MAP_DIRECT if PPC_PSERIES
0122 select ARCH_HAS_FORTIFY_SOURCE
0123 select ARCH_HAS_GCOV_PROFILE_ALL
0124 select ARCH_HAS_HUGEPD if HUGETLB_PAGE
0125 select ARCH_HAS_KCOV
0126 select ARCH_HAS_MEMBARRIER_CALLBACKS
0127 select ARCH_HAS_MEMBARRIER_SYNC_CORE
0128 select ARCH_HAS_MEMREMAP_COMPAT_ALIGN if PPC_64S_HASH_MMU
0129 select ARCH_HAS_MMIOWB if PPC64
0130 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
0131 select ARCH_HAS_PHYS_TO_DMA
0132 select ARCH_HAS_PMEM_API
0133 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
0134 select ARCH_HAS_PTE_SPECIAL
0135 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
0136 select ARCH_HAS_SET_MEMORY
0137 select ARCH_HAS_STRICT_KERNEL_RWX if (PPC_BOOK3S || PPC_8xx || 40x) && !HIBERNATION
0138 select ARCH_HAS_STRICT_KERNEL_RWX if FSL_BOOKE && !HIBERNATION && !RANDOMIZE_BASE
0139 select ARCH_HAS_STRICT_MODULE_RWX if ARCH_HAS_STRICT_KERNEL_RWX
0140 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
0141 select ARCH_HAS_UACCESS_FLUSHCACHE
0142 select ARCH_HAS_UBSAN_SANITIZE_ALL
0143 select ARCH_HAVE_NMI_SAFE_CMPXCHG
0144 select ARCH_KEEP_MEMBLOCK
0145 select ARCH_MIGHT_HAVE_PC_PARPORT
0146 select ARCH_MIGHT_HAVE_PC_SERIO
0147 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
0148 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
0149 select ARCH_STACKWALK
0150 select ARCH_SUPPORTS_ATOMIC_RMW
0151 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC_BOOK3S || PPC_8xx || 40x
0152 select ARCH_USE_BUILTIN_BSWAP
0153 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
0154 select ARCH_USE_MEMTEST
0155 select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS
0156 select ARCH_USE_QUEUED_SPINLOCKS if PPC_QUEUED_SPINLOCKS
0157 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
0158 select ARCH_WANT_IPC_PARSE_VERSION
0159 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
0160 select ARCH_WANT_LD_ORPHAN_WARN
0161 select ARCH_WANTS_MODULES_DATA_IN_VMALLOC if PPC_BOOK3S_32 || PPC_8xx
0162 select ARCH_WANTS_NO_INSTR
0163 select ARCH_WEAK_RELEASE_ACQUIRE
0164 select BINFMT_ELF
0165 select BUILDTIME_TABLE_SORT
0166 select CLONE_BACKWARDS
0167 select CPUMASK_OFFSTACK if NR_CPUS >= 8192
0168 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
0169 select DMA_OPS_BYPASS if PPC64
0170 select DMA_OPS if PPC64
0171 select DYNAMIC_FTRACE if FUNCTION_TRACER
0172 select EDAC_ATOMIC_SCRUB
0173 select EDAC_SUPPORT
0174 select GENERIC_ATOMIC64 if PPC32
0175 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
0176 select GENERIC_CMOS_UPDATE
0177 select GENERIC_CPU_AUTOPROBE
0178 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
0179 select GENERIC_EARLY_IOREMAP
0180 select GENERIC_GETTIMEOFDAY
0181 select GENERIC_IRQ_SHOW
0182 select GENERIC_IRQ_SHOW_LEVEL
0183 select GENERIC_PCI_IOMAP if PCI
0184 select GENERIC_PTDUMP
0185 select GENERIC_SMP_IDLE_THREAD
0186 select GENERIC_TIME_VSYSCALL
0187 select GENERIC_VDSO_TIME_NS
0188 select HAVE_ARCH_AUDITSYSCALL
0189 select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP
0190 select HAVE_ARCH_HUGE_VMAP if PPC_RADIX_MMU || PPC_8xx
0191 select HAVE_ARCH_JUMP_LABEL
0192 select HAVE_ARCH_JUMP_LABEL_RELATIVE
0193 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
0194 select HAVE_ARCH_KASAN if PPC_RADIX_MMU
0195 select HAVE_ARCH_KASAN if PPC_BOOK3E_64
0196 select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN
0197 select HAVE_ARCH_KFENCE if PPC_BOOK3S_32 || PPC_8xx || 40x
0198 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
0199 select HAVE_ARCH_KGDB
0200 select HAVE_ARCH_MMAP_RND_BITS
0201 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
0202 select HAVE_ARCH_NVRAM_OPS
0203 select HAVE_ARCH_SECCOMP_FILTER
0204 select HAVE_ARCH_TRACEHOOK
0205 select HAVE_ASM_MODVERSIONS
0206 select HAVE_CONTEXT_TRACKING_USER if PPC64
0207 select HAVE_C_RECORDMCOUNT
0208 select HAVE_DEBUG_KMEMLEAK
0209 select HAVE_DEBUG_STACKOVERFLOW
0210 select HAVE_DYNAMIC_FTRACE
0211 select HAVE_DYNAMIC_FTRACE_WITH_ARGS if MPROFILE_KERNEL || PPC32
0212 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL || PPC32
0213 select HAVE_EBPF_JIT
0214 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
0215 select HAVE_FAST_GUP
0216 select HAVE_FTRACE_MCOUNT_RECORD
0217 select HAVE_FUNCTION_DESCRIPTORS if PPC64_ELF_ABI_V1
0218 select HAVE_FUNCTION_ERROR_INJECTION
0219 select HAVE_FUNCTION_GRAPH_TRACER
0220 select HAVE_FUNCTION_TRACER
0221 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
0222 select HAVE_GENERIC_VDSO
0223 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC_BOOK3S_64 && SMP
0224 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
0225 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
0226 select HAVE_IOREMAP_PROT
0227 select HAVE_IRQ_TIME_ACCOUNTING
0228 select HAVE_KERNEL_GZIP
0229 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
0230 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
0231 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
0232 select HAVE_KPROBES
0233 select HAVE_KPROBES_ON_FTRACE
0234 select HAVE_KRETPROBES
0235 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
0236 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
0237 select HAVE_MOD_ARCH_SPECIFIC
0238 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
0239 select HAVE_OPTPROBES
0240 select HAVE_PERF_EVENTS
0241 select HAVE_PERF_EVENTS_NMI if PPC64
0242 select HAVE_PERF_REGS
0243 select HAVE_PERF_USER_STACK_DUMP
0244 select HAVE_REGS_AND_STACK_ACCESS_API
0245 select HAVE_RELIABLE_STACKTRACE
0246 select HAVE_RSEQ
0247 select HAVE_SETUP_PER_CPU_AREA if PPC64
0248 select HAVE_SOFTIRQ_ON_OWN_STACK
0249 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
0250 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
0251 select HAVE_STATIC_CALL if PPC32
0252 select HAVE_SYSCALL_TRACEPOINTS
0253 select HAVE_VIRT_CPU_ACCOUNTING
0254 select HUGETLB_PAGE_SIZE_VARIABLE if PPC_BOOK3S_64 && HUGETLB_PAGE
0255 select IOMMU_HELPER if PPC64
0256 select IRQ_DOMAIN
0257 select IRQ_FORCED_THREADING
0258 select KASAN_VMALLOC if KASAN && MODULES
0259 select MMU_GATHER_PAGE_SIZE
0260 select MMU_GATHER_RCU_TABLE_FREE
0261 select MMU_GATHER_MERGE_VMAS
0262 select MODULES_USE_ELF_RELA
0263 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
0264 select NEED_PER_CPU_EMBED_FIRST_CHUNK if PPC64
0265 select NEED_PER_CPU_PAGE_FIRST_CHUNK if PPC64
0266 select NEED_SG_DMA_LENGTH
0267 select OF
0268 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
0269 select OF_EARLY_FLATTREE
0270 select OLD_SIGACTION if PPC32
0271 select OLD_SIGSUSPEND
0272 select PCI_DOMAINS if PCI
0273 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
0274 select PCI_SYSCALL if PCI
0275 select PPC_DAWR if PPC64
0276 select RTC_LIB
0277 select SPARSE_IRQ
0278 select STRICT_KERNEL_RWX if STRICT_MODULE_RWX
0279 select SYSCTL_EXCEPTION_TRACE
0280 select THREAD_INFO_IN_TASK
0281 select TRACE_IRQFLAGS_SUPPORT
0282 #
0283 # Please keep this list sorted alphabetically.
0284 #
0285
0286 config PPC_LONG_DOUBLE_128
0287 depends on PPC64
0288 def_bool $(success,test "$(shell,echo __LONG_DOUBLE_128__ | $(CC) -E -P -)" = 1)
0289
0290 config PPC_BARRIER_NOSPEC
0291 bool
0292 default y
0293 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
0294
0295 config EARLY_PRINTK
0296 bool
0297 default y
0298
0299 config PANIC_TIMEOUT
0300 int
0301 default 180
0302
0303 config COMPAT
0304 bool "Enable support for 32bit binaries"
0305 depends on PPC64
0306 depends on !CC_IS_CLANG || CLANG_VERSION >= 120000
0307 default y if !CPU_LITTLE_ENDIAN
0308 select ARCH_WANT_OLD_COMPAT_IPC
0309 select COMPAT_OLD_SIGACTION
0310
0311 config SCHED_OMIT_FRAME_POINTER
0312 bool
0313 default y
0314
0315 config ARCH_MAY_HAVE_PC_FDC
0316 bool
0317 default PCI
0318
0319 config PPC_UDBG_16550
0320 bool
0321
0322 config GENERIC_TBSYNC
0323 bool
0324 default y if PPC32 && SMP
0325
0326 config AUDIT_ARCH
0327 bool
0328 default y
0329
0330 config GENERIC_BUG
0331 bool
0332 default y
0333 depends on BUG
0334
0335 config GENERIC_BUG_RELATIVE_POINTERS
0336 def_bool y
0337 depends on GENERIC_BUG
0338
0339 config SYS_SUPPORTS_APM_EMULATION
0340 default y if PMAC_APM_EMU
0341 bool
0342
0343 config EPAPR_BOOT
0344 bool
0345 help
0346 Used to allow a board to specify it wants an ePAPR compliant wrapper.
0347
0348 config DEFAULT_UIMAGE
0349 bool
0350 help
0351 Used to allow a board to specify it wants a uImage built by default
0352
0353 config ARCH_HIBERNATION_POSSIBLE
0354 bool
0355 default y
0356
0357 config ARCH_SUSPEND_POSSIBLE
0358 def_bool y
0359 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
0360 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
0361 || 44x || 40x
0362
0363 config ARCH_SUSPEND_NONZERO_CPU
0364 def_bool y
0365 depends on PPC_POWERNV || PPC_PSERIES
0366
0367 config ARCH_HAS_ADD_PAGES
0368 def_bool y
0369 depends on ARCH_ENABLE_MEMORY_HOTPLUG
0370
0371 config PPC_DCR_NATIVE
0372 bool
0373
0374 config PPC_DCR_MMIO
0375 bool
0376
0377 config PPC_DCR
0378 bool
0379 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
0380 default y
0381
0382 config PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
0383 depends on PPC32
0384 depends on !PPC_PMAC && !PPC_CHRP
0385 bool "Assign PCI bus numbers from zero individually for each PCI domain"
0386 help
0387 By default on PPC32 were PCI bus numbers unique across all PCI domains.
0388 So system could have only 256 PCI buses independently of available
0389 PCI domains. When this option is enabled then PCI bus numbers are
0390 PCI domain dependent and each PCI controller on own domain can have
0391 256 PCI buses, like it is on other Linux architectures.
0392
0393 config PPC_OF_PLATFORM_PCI
0394 bool
0395 depends on PCI
0396 depends on PPC64 # not supported on 32 bits yet
0397
0398 config ARCH_SUPPORTS_UPROBES
0399 def_bool y
0400
0401 config PPC_ADV_DEBUG_REGS
0402 bool
0403 depends on 40x || BOOKE
0404 default y
0405
0406 config PPC_ADV_DEBUG_IACS
0407 int
0408 depends on PPC_ADV_DEBUG_REGS
0409 default 4 if 44x
0410 default 2
0411
0412 config PPC_ADV_DEBUG_DACS
0413 int
0414 depends on PPC_ADV_DEBUG_REGS
0415 default 2
0416
0417 config PPC_ADV_DEBUG_DVCS
0418 int
0419 depends on PPC_ADV_DEBUG_REGS
0420 default 2 if 44x
0421 default 0
0422
0423 config PPC_ADV_DEBUG_DAC_RANGE
0424 bool
0425 depends on PPC_ADV_DEBUG_REGS && 44x
0426 default y
0427
0428 config PPC_DAWR
0429 bool
0430
0431 config PGTABLE_LEVELS
0432 int
0433 default 2 if !PPC64
0434 default 4
0435
0436 source "arch/powerpc/sysdev/Kconfig"
0437 source "arch/powerpc/platforms/Kconfig"
0438
0439 menu "Kernel options"
0440
0441 config HIGHMEM
0442 bool "High memory support"
0443 depends on PPC32
0444 select KMAP_LOCAL
0445
0446 source "kernel/Kconfig.hz"
0447
0448 config MATH_EMULATION
0449 bool "Math emulation"
0450 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT
0451 select PPC_FPU_REGS
0452 help
0453 Some PowerPC chips designed for embedded applications do not have
0454 a floating-point unit and therefore do not implement the
0455 floating-point instructions in the PowerPC instruction set. If you
0456 say Y here, the kernel will include code to emulate a floating-point
0457 unit, which will allow programs that use floating-point
0458 instructions to run.
0459
0460 This is also useful to emulate missing (optional) instructions
0461 such as fsqrt on cores that do have an FPU but do not implement
0462 them (such as Freescale BookE).
0463
0464 choice
0465 prompt "Math emulation options"
0466 default MATH_EMULATION_FULL
0467 depends on MATH_EMULATION
0468
0469 config MATH_EMULATION_FULL
0470 bool "Emulate all the floating point instructions"
0471 help
0472 Select this option will enable the kernel to support to emulate
0473 all the floating point instructions. If your SoC doesn't have
0474 a FPU, you should select this.
0475
0476 config MATH_EMULATION_HW_UNIMPLEMENTED
0477 bool "Just emulate the FPU unimplemented instructions"
0478 help
0479 Select this if you know there does have a hardware FPU on your
0480 SoC, but some floating point instructions are not implemented by that.
0481
0482 endchoice
0483
0484 config PPC_TRANSACTIONAL_MEM
0485 bool "Transactional Memory support for POWERPC"
0486 depends on PPC_BOOK3S_64
0487 depends on SMP
0488 select ALTIVEC
0489 select VSX
0490 help
0491 Support user-mode Transactional Memory on POWERPC.
0492
0493 config PPC_UV
0494 bool "Ultravisor support"
0495 depends on KVM_BOOK3S_HV_POSSIBLE
0496 depends on DEVICE_PRIVATE
0497 default n
0498 help
0499 This option paravirtualizes the kernel to run in POWER platforms that
0500 supports the Protected Execution Facility (PEF). On such platforms,
0501 the ultravisor firmware runs at a privilege level above the
0502 hypervisor.
0503
0504 If unsure, say "N".
0505
0506 config LD_HEAD_STUB_CATCH
0507 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
0508 depends on PPC64
0509 help
0510 Very large kernels can cause linker branch stubs to be generated by
0511 code in head_64.S, which moves the head text sections out of their
0512 specified location. This option can work around the problem.
0513
0514 If unsure, say "N".
0515
0516 config MPROFILE_KERNEL
0517 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
0518 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
0519
0520 config HOTPLUG_CPU
0521 bool "Support for enabling/disabling CPUs"
0522 depends on SMP && (PPC_PSERIES || \
0523 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
0524 help
0525 Say Y here to be able to disable and re-enable individual
0526 CPUs at runtime on SMP machines.
0527
0528 Say N if you are unsure.
0529
0530 config PPC_QUEUED_SPINLOCKS
0531 bool "Queued spinlocks" if EXPERT
0532 depends on SMP
0533 default PPC_BOOK3S_64
0534 help
0535 Say Y here to use queued spinlocks which give better scalability and
0536 fairness on large SMP and NUMA systems without harming single threaded
0537 performance.
0538
0539 config ARCH_CPU_PROBE_RELEASE
0540 def_bool y
0541 depends on HOTPLUG_CPU
0542
0543 config PPC64_SUPPORTS_MEMORY_FAILURE
0544 bool "Add support for memory hwpoison"
0545 depends on PPC_BOOK3S_64
0546 default "y" if PPC_POWERNV
0547 select ARCH_SUPPORTS_MEMORY_FAILURE
0548
0549 config KEXEC
0550 bool "kexec system call"
0551 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
0552 select KEXEC_CORE
0553 help
0554 kexec is a system call that implements the ability to shutdown your
0555 current kernel, and to start another kernel. It is like a reboot
0556 but it is independent of the system firmware. And like a reboot
0557 you can start any kernel with it, not just Linux.
0558
0559 The name comes from the similarity to the exec system call.
0560
0561 It is an ongoing process to be certain the hardware in a machine
0562 is properly shutdown, so do not be surprised if this code does not
0563 initially work for you. As of this writing the exact hardware
0564 interface is strongly in flux, so no good recommendation can be
0565 made.
0566
0567 config KEXEC_FILE
0568 bool "kexec file based system call"
0569 select KEXEC_CORE
0570 select HAVE_IMA_KEXEC if IMA
0571 select KEXEC_ELF
0572 depends on PPC64
0573 depends on CRYPTO=y
0574 depends on CRYPTO_SHA256=y
0575 help
0576 This is a new version of the kexec system call. This call is
0577 file based and takes in file descriptors as system call arguments
0578 for kernel and initramfs as opposed to a list of segments as is the
0579 case for the older kexec call.
0580
0581 config ARCH_HAS_KEXEC_PURGATORY
0582 def_bool KEXEC_FILE
0583
0584 config RELOCATABLE
0585 bool "Build a relocatable kernel"
0586 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
0587 select NONSTATIC_KERNEL
0588 help
0589 This builds a kernel image that is capable of running at the
0590 location the kernel is loaded at. For ppc32, there is no any
0591 alignment restrictions, and this feature is a superset of
0592 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
0593 16k-aligned base address. The kernel is linked as a
0594 position-independent executable (PIE) and contains dynamic relocations
0595 which are processed early in the bootup process.
0596
0597 One use is for the kexec on panic case where the recovery kernel
0598 must live at a different physical address than the primary
0599 kernel.
0600
0601 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
0602 it has been loaded at and the compile time physical addresses
0603 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
0604 setting can still be useful to bootwrappers that need to know the
0605 load address of the kernel (eg. u-boot/mkimage).
0606
0607 config RANDOMIZE_BASE
0608 bool "Randomize the address of the kernel image"
0609 depends on (FSL_BOOKE && FLATMEM && PPC32)
0610 depends on RELOCATABLE
0611 help
0612 Randomizes the virtual address at which the kernel image is
0613 loaded, as a security feature that deters exploit attempts
0614 relying on knowledge of the location of kernel internals.
0615
0616 If unsure, say Y.
0617
0618 config RELOCATABLE_TEST
0619 bool "Test relocatable kernel"
0620 depends on (PPC64 && RELOCATABLE)
0621 help
0622 This runs the relocatable kernel at the address it was initially
0623 loaded at, which tends to be non-zero and therefore test the
0624 relocation code.
0625
0626 config CRASH_DUMP
0627 bool "Build a dump capture kernel"
0628 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
0629 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
0630 help
0631 Build a kernel suitable for use as a dump capture kernel.
0632 The same kernel binary can be used as production kernel and dump
0633 capture kernel.
0634
0635 config FA_DUMP
0636 bool "Firmware-assisted dump"
0637 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
0638 select CRASH_CORE
0639 select CRASH_DUMP
0640 help
0641 A robust mechanism to get reliable kernel crash dump with
0642 assistance from firmware. This approach does not use kexec,
0643 instead firmware assists in booting the capture kernel
0644 while preserving memory contents. Firmware-assisted dump
0645 is meant to be a kdump replacement offering robustness and
0646 speed not possible without system firmware assistance.
0647
0648 If unsure, say "y". Only special kernels like petitboot may
0649 need to say "N" here.
0650
0651 config PRESERVE_FA_DUMP
0652 bool "Preserve Firmware-assisted dump"
0653 depends on PPC64 && PPC_POWERNV && !FA_DUMP
0654 help
0655 On a kernel with FA_DUMP disabled, this option helps to preserve
0656 crash data from a previously crash'ed kernel. Useful when the next
0657 memory preserving kernel boot would process this crash data.
0658 Petitboot kernel is the typical usecase for this option.
0659
0660 config OPAL_CORE
0661 bool "Export OPAL memory as /sys/firmware/opal/core"
0662 depends on PPC64 && PPC_POWERNV
0663 help
0664 This option uses the MPIPL support in firmware to provide an
0665 ELF core of OPAL memory after a crash. The ELF core is exported
0666 as /sys/firmware/opal/core file which is helpful in debugging
0667 OPAL crashes using GDB.
0668
0669 config IRQ_ALL_CPUS
0670 bool "Distribute interrupts on all CPUs by default"
0671 depends on SMP
0672 help
0673 This option gives the kernel permission to distribute IRQs across
0674 multiple CPUs. Saying N here will route all IRQs to the first
0675 CPU. Generally saying Y is safe, although some problems have been
0676 reported with SMP Power Macintoshes with this option enabled.
0677
0678 config NUMA
0679 bool "NUMA Memory Allocation and Scheduler Support"
0680 depends on PPC64 && SMP
0681 default y if PPC_PSERIES || PPC_POWERNV
0682 select USE_PERCPU_NUMA_NODE_ID
0683 help
0684 Enable NUMA (Non-Uniform Memory Access) support.
0685
0686 The kernel will try to allocate memory used by a CPU on the
0687 local memory controller of the CPU and add some more
0688 NUMA awareness to the kernel.
0689
0690 config NODES_SHIFT
0691 int
0692 default "8" if PPC64
0693 default "4"
0694 depends on NUMA
0695
0696 config HAVE_MEMORYLESS_NODES
0697 def_bool y
0698 depends on NUMA
0699
0700 config ARCH_SELECT_MEMORY_MODEL
0701 def_bool y
0702 depends on PPC64
0703
0704 config ARCH_FLATMEM_ENABLE
0705 def_bool y
0706 depends on (PPC64 && !NUMA) || PPC32
0707
0708 config ARCH_SPARSEMEM_ENABLE
0709 def_bool y
0710 depends on PPC64
0711 select SPARSEMEM_VMEMMAP_ENABLE
0712
0713 config ARCH_SPARSEMEM_DEFAULT
0714 def_bool y
0715 depends on PPC_BOOK3S_64
0716
0717 config ILLEGAL_POINTER_VALUE
0718 hex
0719 # This is roughly half way between the top of user space and the bottom
0720 # of kernel space, which seems about as good as we can get.
0721 default 0x5deadbeef0000000 if PPC64
0722 default 0
0723
0724 config ARCH_MEMORY_PROBE
0725 def_bool y
0726 depends on MEMORY_HOTPLUG
0727
0728 choice
0729 prompt "Page size"
0730 default PPC_64K_PAGES if PPC_BOOK3S_64
0731 default PPC_4K_PAGES
0732 help
0733 Select the kernel logical page size. Increasing the page size
0734 will reduce software overhead at each page boundary, allow
0735 hardware prefetch mechanisms to be more effective, and allow
0736 larger dma transfers increasing IO efficiency and reducing
0737 overhead. However the utilization of memory will increase.
0738 For example, each cached file will using a multiple of the
0739 page size to hold its contents and the difference between the
0740 end of file and the end of page is wasted.
0741
0742 Some dedicated systems, such as software raid serving with
0743 accelerated calculations, have shown significant increases.
0744
0745 If you configure a 64 bit kernel for 64k pages but the
0746 processor does not support them, then the kernel will simulate
0747 them with 4k pages, loading them on demand, but with the
0748 reduced software overhead and larger internal fragmentation.
0749 For the 32 bit kernel, a large page option will not be offered
0750 unless it is supported by the configured processor.
0751
0752 If unsure, choose 4K_PAGES.
0753
0754 config PPC_4K_PAGES
0755 bool "4k page size"
0756 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
0757
0758 config PPC_16K_PAGES
0759 bool "16k page size"
0760 depends on 44x || PPC_8xx
0761
0762 config PPC_64K_PAGES
0763 bool "64k page size"
0764 depends on 44x || PPC_BOOK3S_64
0765 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
0766
0767 config PPC_256K_PAGES
0768 bool "256k page size (Requires non-standard binutils settings)"
0769 depends on 44x && !PPC_47x
0770 help
0771 Make the page size 256k.
0772
0773 The kernel will only be able to run applications that have been
0774 compiled with '-zmax-page-size' set to 256K (the default is 64K) using
0775 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
0776 definition from 0x10000 to 0x40000 in older versions.
0777
0778 endchoice
0779
0780 config PAGE_SIZE_4KB
0781 def_bool y
0782 depends on PPC_4K_PAGES
0783
0784 config PAGE_SIZE_16KB
0785 def_bool y
0786 depends on PPC_16K_PAGES
0787
0788 config PAGE_SIZE_64KB
0789 def_bool y
0790 depends on PPC_64K_PAGES
0791
0792 config PAGE_SIZE_256KB
0793 def_bool y
0794 depends on PPC_256K_PAGES
0795
0796 config PPC_PAGE_SHIFT
0797 int
0798 default 18 if PPC_256K_PAGES
0799 default 16 if PPC_64K_PAGES
0800 default 14 if PPC_16K_PAGES
0801 default 12
0802
0803 config THREAD_SHIFT
0804 int "Thread shift" if EXPERT
0805 range 13 15
0806 default "15" if PPC_256K_PAGES
0807 default "14" if PPC64
0808 default "13"
0809 help
0810 Used to define the stack size. The default is almost always what you
0811 want. Only change this if you know what you are doing.
0812
0813 config DATA_SHIFT_BOOL
0814 bool "Set custom data alignment"
0815 depends on ADVANCED_OPTIONS
0816 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE
0817 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX) || \
0818 FSL_BOOKE
0819 help
0820 This option allows you to set the kernel data alignment. When
0821 RAM is mapped by blocks, the alignment needs to fit the size and
0822 number of possible blocks. The default should be OK for most configs.
0823
0824 Say N here unless you know what you are doing.
0825
0826 config DATA_SHIFT
0827 int "Data shift" if DATA_SHIFT_BOOL
0828 default 24 if STRICT_KERNEL_RWX && PPC64
0829 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
0830 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
0831 range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_FSL_BOOKE
0832 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
0833 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
0834 default 23 if STRICT_KERNEL_RWX && PPC_8xx
0835 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA
0836 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
0837 default 24 if STRICT_KERNEL_RWX && FSL_BOOKE
0838 default PPC_PAGE_SHIFT
0839 help
0840 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
0841 Smaller is the alignment, greater is the number of necessary DBATs.
0842
0843 On 8xx, large pages (512kb or 8M) are used to map kernel linear
0844 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
0845 in that case. If PIN_TLB is selected, it must be aligned to 8M as
0846 8M pages will be pinned.
0847
0848 config FORCE_MAX_ZONEORDER
0849 int "Maximum zone order"
0850 range 8 9 if PPC64 && PPC_64K_PAGES
0851 default "9" if PPC64 && PPC_64K_PAGES
0852 range 13 13 if PPC64 && !PPC_64K_PAGES
0853 default "13" if PPC64 && !PPC_64K_PAGES
0854 range 9 64 if PPC32 && PPC_16K_PAGES
0855 default "9" if PPC32 && PPC_16K_PAGES
0856 range 7 64 if PPC32 && PPC_64K_PAGES
0857 default "7" if PPC32 && PPC_64K_PAGES
0858 range 5 64 if PPC32 && PPC_256K_PAGES
0859 default "5" if PPC32 && PPC_256K_PAGES
0860 range 11 64
0861 default "11"
0862 help
0863 The kernel memory allocator divides physically contiguous memory
0864 blocks into "zones", where each zone is a power of two number of
0865 pages. This option selects the largest power of two that the kernel
0866 keeps in the memory allocator. If you need to allocate very large
0867 blocks of physically contiguous memory, then you may need to
0868 increase this value.
0869
0870 This config option is actually maximum order plus one. For example,
0871 a value of 11 means that the largest free memory block is 2^10 pages.
0872
0873 The page size is not necessarily 4KB. For example, on 64-bit
0874 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
0875 this in mind when choosing a value for this option.
0876
0877 config PPC_SUBPAGE_PROT
0878 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
0879 default n
0880 depends on PPC_64S_HASH_MMU && PPC_64K_PAGES
0881 help
0882 This option adds support for system call to allow user programs
0883 to set access permissions (read/write, readonly, or no access)
0884 on the 4k subpages of each 64k page.
0885
0886 If unsure, say N here.
0887
0888 config PPC_PROT_SAO_LPAR
0889 bool "Support PROT_SAO mappings in LPARs"
0890 depends on PPC_BOOK3S_64
0891 help
0892 This option adds support for PROT_SAO mappings from userspace
0893 inside LPARs on supported CPUs.
0894
0895 This may cause issues when performing guest migration from
0896 a CPU that supports SAO to one that does not.
0897
0898 If unsure, say N here.
0899
0900 config PPC_COPRO_BASE
0901 bool
0902
0903 config SCHED_SMT
0904 bool "SMT (Hyperthreading) scheduler support"
0905 depends on PPC64 && SMP
0906 help
0907 SMT scheduler support improves the CPU scheduler's decision making
0908 when dealing with POWER5 cpus at a cost of slightly increased
0909 overhead in some places. If unsure say N here.
0910
0911 config PPC_DENORMALISATION
0912 bool "PowerPC denormalisation exception handling"
0913 depends on PPC_BOOK3S_64
0914 default "y" if PPC_POWERNV
0915 help
0916 Add support for handling denormalisation of single precision
0917 values. Useful for bare metal only. If unsure say Y here.
0918
0919 config CMDLINE
0920 string "Initial kernel command string"
0921 default ""
0922 help
0923 On some platforms, there is currently no way for the boot loader to
0924 pass arguments to the kernel. For these platforms, you can supply
0925 some command-line options at build time by entering them here. In
0926 most cases you will need to specify the root device here.
0927
0928 choice
0929 prompt "Kernel command line type" if CMDLINE != ""
0930 default CMDLINE_FROM_BOOTLOADER
0931
0932 config CMDLINE_FROM_BOOTLOADER
0933 bool "Use bootloader kernel arguments if available"
0934 help
0935 Uses the command-line options passed by the boot loader. If
0936 the boot loader doesn't provide any, the default kernel command
0937 string provided in CMDLINE will be used.
0938
0939 config CMDLINE_EXTEND
0940 bool "Extend bootloader kernel arguments"
0941 help
0942 The command-line arguments provided by the boot loader will be
0943 appended to the default kernel command string.
0944
0945 config CMDLINE_FORCE
0946 bool "Always use the default kernel command string"
0947 help
0948 Always use the default kernel command string, even if the boot
0949 loader passes other arguments to the kernel.
0950 This is useful if you cannot or don't want to change the
0951 command-line options your boot loader passes to the kernel.
0952
0953 endchoice
0954
0955 config EXTRA_TARGETS
0956 string "Additional default image types"
0957 help
0958 List additional targets to be built by the bootwrapper here (separated
0959 by spaces). This is useful for targets that depend of device tree
0960 files in the .dts directory.
0961
0962 Targets in this list will be build as part of the default build
0963 target, or when the user does a 'make zImage' or a
0964 'make zImage.initrd'.
0965
0966 If unsure, leave blank
0967
0968 config ARCH_WANTS_FREEZER_CONTROL
0969 def_bool y
0970 depends on ADB_PMU
0971
0972 source "kernel/power/Kconfig"
0973
0974 config PPC_MEM_KEYS
0975 prompt "PowerPC Memory Protection Keys"
0976 def_bool y
0977 depends on PPC_BOOK3S_64
0978 depends on PPC_64S_HASH_MMU
0979 select ARCH_USES_HIGH_VMA_FLAGS
0980 select ARCH_HAS_PKEYS
0981 help
0982 Memory Protection Keys provides a mechanism for enforcing
0983 page-based protections, but without requiring modification of the
0984 page tables when an application changes protection domains.
0985
0986 For details, see Documentation/core-api/protection-keys.rst
0987
0988 If unsure, say y.
0989
0990 config PPC_SECURE_BOOT
0991 prompt "Enable secure boot support"
0992 bool
0993 depends on PPC_POWERNV || PPC_PSERIES
0994 depends on IMA_ARCH_POLICY
0995 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
0996 help
0997 Systems with firmware secure boot enabled need to define security
0998 policies to extend secure boot to the OS. This config allows a user
0999 to enable OS secure boot on systems that have firmware support for
1000 it. If in doubt say N.
1001
1002 config 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
1013 config 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
1026 endmenu
1027
1028 config ISA_DMA_API
1029 bool
1030 default PCI
1031
1032 menu "Bus options"
1033
1034 config 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
1045 config GENERIC_ISA_DMA
1046 bool
1047 depends on ISA_DMA_API
1048 default y
1049
1050 config PPC_INDIRECT_PCI
1051 bool
1052 depends on PCI
1053 default y if 40x || 44x
1054
1055 config SBUS
1056 bool
1057
1058 config FSL_SOC
1059 bool
1060
1061 config FSL_PCI
1062 bool
1063 select ARCH_HAS_DMA_SET_MASK
1064 select PPC_INDIRECT_PCI
1065 select PCI_QUIRKS
1066
1067 config 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
1075 config 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
1084 config 4xx_SOC
1085 bool
1086
1087 config 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
1094 config FSL_GTM
1095 bool
1096 depends on PPC_83xx || QUICC_ENGINE || CPM2
1097 help
1098 Freescale General-purpose Timers support
1099
1100 config PCI_8260
1101 bool
1102 depends on PCI && 8260
1103 select PPC_INDIRECT_PCI
1104 default y
1105
1106 config 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
1114 endmenu
1115
1116 config NONSTATIC_KERNEL
1117 bool
1118
1119 menu "Advanced setup"
1120 depends on PPC32
1121
1122 config 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
1132 comment "Default settings for advanced configuration options are used"
1133 depends on !ADVANCED_OPTIONS
1134
1135 config 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
1147 config LOWMEM_SIZE
1148 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1149 default "0x30000000"
1150
1151 config 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
1163 config 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
1171 config 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
1189 config 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
1199 config PAGE_OFFSET
1200 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1201 default "0xc0000000"
1202
1203 config 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
1214 config 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
1220 config 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
1228 config 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
1233 config 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
1241 config 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
1251 config 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"
1256 endmenu
1257
1258 if PPC64
1259 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1260 config PAGE_OFFSET
1261 hex
1262 default "0xc000000000000000"
1263 config KERNEL_START
1264 hex
1265 default "0xc000000000000000"
1266 config PHYSICAL_START
1267 hex
1268 default "0x00000000"
1269 endif
1270
1271 config PPC_LIB_RHEAP
1272 bool
1273
1274 source "arch/powerpc/kvm/Kconfig"
1275
1276 source "kernel/livepatch/Kconfig"
