1 # SPDX-License-Identifier: GPL-2.0
2 source "arch/powerpc/platforms/Kconfig.cputype"
5 def_bool PPC64 && $(cc-option, -mabi=elfv2)
23 config ARCH_MMAP_RND_BITS_MAX
24 # On Book3S 64, the default virtual address space for 64-bit processes
25 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
26 # 32T of address space (2^45), which should ensure a reasonable gap
27 # between bottom-up and top-down allocations for applications that
28 # consume "normal" amounts of address space. Book3S 64 only supports 64K
30 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
31 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K)
33 # On all other 64-bit platforms (currently only Book3E), the virtual
34 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
35 # of address space (2^44). Only 4K page sizes are supported.
36 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K)
38 # For 32-bit, use the compat values, as they're the same.
39 default ARCH_MMAP_RND_COMPAT_BITS_MAX
41 config ARCH_MMAP_RND_BITS_MIN
42 # Allow randomisation to consume up to 1GB of address space (2^30).
43 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K)
44 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K)
46 # For 32-bit, use the compat values, as they're the same.
47 default ARCH_MMAP_RND_COMPAT_BITS_MIN
49 config ARCH_MMAP_RND_COMPAT_BITS_MAX
50 # Total virtual address space for 32-bit processes is 2^31 (2GB).
51 # Allow randomisation to consume up to 512MB of address space (2^29).
52 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K)
53 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K)
54 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K)
55 default 17 # 17 = 29 (512MB) - 12 (4K)
57 config ARCH_MMAP_RND_COMPAT_BITS_MIN
58 # Total virtual address space for 32-bit processes is 2^31 (2GB).
59 # Allow randomisation to consume up to 8MB of address space (2^23).
60 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K)
61 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K)
62 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K)
63 default 11 # 11 = 23 (8MB) - 12 (4K)
66 int "Number of virtual interrupt numbers"
70 This defines the number of virtual interrupt numbers the kernel
71 can manage. Virtual interrupt numbers are what you see in
72 /proc/interrupts. If you configure your system to have too few,
73 drivers will fail to load or worse - handle with care.
77 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
82 depends on HARDLOCKUP_DETECTOR
83 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
86 This is a placeholder when the powerpc hardlockup detector
87 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
88 selected via the generic lockup detector menu which is why we
89 have no standalone config option for it here.
91 config STACKTRACE_SUPPORT
95 config LOCKDEP_SUPPORT
99 config GENERIC_LOCKBREAK
102 depends on SMP && PREEMPTION && !PPC_QUEUED_SPINLOCKS
104 config GENERIC_HWEIGHT
112 # Please keep this list sorted alphabetically.
114 select ARCH_32BIT_OFF_T if PPC32
115 select ARCH_DISABLE_KASAN_INLINE if PPC_RADIX_MMU
116 select ARCH_ENABLE_MEMORY_HOTPLUG
117 select ARCH_ENABLE_MEMORY_HOTREMOVE
118 select ARCH_HAS_COPY_MC if PPC64
119 select ARCH_HAS_CURRENT_STACK_POINTER
120 select ARCH_HAS_DEBUG_VIRTUAL
121 select ARCH_HAS_DEBUG_VM_PGTABLE
122 select ARCH_HAS_DEBUG_WX if STRICT_KERNEL_RWX
123 select ARCH_HAS_DEVMEM_IS_ALLOWED
124 select ARCH_HAS_DMA_MAP_DIRECT if PPC_PSERIES
125 select ARCH_HAS_FORTIFY_SOURCE
126 select ARCH_HAS_GCOV_PROFILE_ALL
127 select ARCH_HAS_HUGEPD if HUGETLB_PAGE
129 select ARCH_HAS_MEMBARRIER_CALLBACKS
130 select ARCH_HAS_MEMBARRIER_SYNC_CORE
131 select ARCH_HAS_MEMREMAP_COMPAT_ALIGN if PPC_64S_HASH_MMU
132 select ARCH_HAS_MMIOWB if PPC64
133 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
134 select ARCH_HAS_PHYS_TO_DMA
135 select ARCH_HAS_PMEM_API
136 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
137 select ARCH_HAS_PTE_SPECIAL
138 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
139 select ARCH_HAS_SET_MEMORY
140 select ARCH_HAS_STRICT_KERNEL_RWX if (PPC_BOOK3S || PPC_8xx || 40x) && !HIBERNATION
141 select ARCH_HAS_STRICT_KERNEL_RWX if PPC_85xx && !HIBERNATION && !RANDOMIZE_BASE
142 select ARCH_HAS_STRICT_MODULE_RWX if ARCH_HAS_STRICT_KERNEL_RWX
143 select ARCH_HAS_SYSCALL_WRAPPER if !SPU_BASE && !COMPAT
144 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
145 select ARCH_HAS_UACCESS_FLUSHCACHE
146 select ARCH_HAS_UBSAN_SANITIZE_ALL
147 select ARCH_HAVE_NMI_SAFE_CMPXCHG
148 select ARCH_KEEP_MEMBLOCK
149 select ARCH_MIGHT_HAVE_PC_PARPORT
150 select ARCH_MIGHT_HAVE_PC_SERIO
151 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
152 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
153 select ARCH_SPLIT_ARG64 if PPC32
154 select ARCH_STACKWALK
155 select ARCH_SUPPORTS_ATOMIC_RMW
156 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC_BOOK3S || PPC_8xx || 40x
157 select ARCH_USE_BUILTIN_BSWAP
158 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
159 select ARCH_USE_MEMTEST
160 select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS
161 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
162 select ARCH_WANT_IPC_PARSE_VERSION
163 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
164 select ARCH_WANT_LD_ORPHAN_WARN
165 select ARCH_WANTS_MODULES_DATA_IN_VMALLOC if PPC_BOOK3S_32 || PPC_8xx
166 select ARCH_WANTS_NO_INSTR
167 select ARCH_WEAK_RELEASE_ACQUIRE
169 select BUILDTIME_TABLE_SORT
170 select CLONE_BACKWARDS
171 select CPUMASK_OFFSTACK if NR_CPUS >= 8192
172 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
173 select DMA_OPS_BYPASS if PPC64
174 select DMA_OPS if PPC64
175 select DYNAMIC_FTRACE if FUNCTION_TRACER
176 select EDAC_ATOMIC_SCRUB
178 select GENERIC_ATOMIC64 if PPC32
179 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
180 select GENERIC_CMOS_UPDATE
181 select GENERIC_CPU_AUTOPROBE
182 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
183 select GENERIC_EARLY_IOREMAP
184 select GENERIC_GETTIMEOFDAY
185 select GENERIC_IRQ_SHOW
186 select GENERIC_IRQ_SHOW_LEVEL
187 select GENERIC_PCI_IOMAP if PCI
188 select GENERIC_PTDUMP
189 select GENERIC_SMP_IDLE_THREAD
190 select GENERIC_TIME_VSYSCALL
191 select GENERIC_VDSO_TIME_NS
192 select HAVE_ARCH_AUDITSYSCALL
193 select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP
194 select HAVE_ARCH_HUGE_VMAP if PPC_RADIX_MMU || PPC_8xx
195 select HAVE_ARCH_JUMP_LABEL
196 select HAVE_ARCH_JUMP_LABEL_RELATIVE
197 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
198 select HAVE_ARCH_KASAN if PPC_RADIX_MMU
199 select HAVE_ARCH_KASAN if PPC_BOOK3E_64
200 select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN
201 select HAVE_ARCH_KFENCE if ARCH_SUPPORTS_DEBUG_PAGEALLOC
202 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
203 select HAVE_ARCH_KGDB
204 select HAVE_ARCH_MMAP_RND_BITS
205 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
206 select HAVE_ARCH_NVRAM_OPS
207 select HAVE_ARCH_SECCOMP_FILTER
208 select HAVE_ARCH_TRACEHOOK
209 select HAVE_ASM_MODVERSIONS
210 select HAVE_CONTEXT_TRACKING_USER if PPC64
211 select HAVE_C_RECORDMCOUNT
212 select HAVE_DEBUG_KMEMLEAK
213 select HAVE_DEBUG_STACKOVERFLOW
214 select HAVE_DYNAMIC_FTRACE
215 select HAVE_DYNAMIC_FTRACE_WITH_ARGS if MPROFILE_KERNEL || PPC32
216 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL || PPC32
218 select HAVE_EFFICIENT_UNALIGNED_ACCESS
220 select HAVE_FTRACE_MCOUNT_RECORD
221 select HAVE_FUNCTION_DESCRIPTORS if PPC64_ELF_ABI_V1
222 select HAVE_FUNCTION_ERROR_INJECTION
223 select HAVE_FUNCTION_GRAPH_TRACER
224 select HAVE_FUNCTION_TRACER
225 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
226 select HAVE_GENERIC_VDSO
227 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC_BOOK3S_64 && SMP
228 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
229 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
230 select HAVE_IOREMAP_PROT
231 select HAVE_IRQ_TIME_ACCOUNTING
232 select HAVE_KERNEL_GZIP
233 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
234 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
235 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
237 select HAVE_KPROBES_ON_FTRACE
238 select HAVE_KRETPROBES
239 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
240 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
241 select HAVE_MOD_ARCH_SPECIFIC
242 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
243 select HAVE_OPTPROBES
244 select HAVE_OBJTOOL if PPC32 || MPROFILE_KERNEL
245 select HAVE_OBJTOOL_MCOUNT if HAVE_OBJTOOL
246 select HAVE_PERF_EVENTS
247 select HAVE_PERF_EVENTS_NMI if PPC64
248 select HAVE_PERF_REGS
249 select HAVE_PERF_USER_STACK_DUMP
250 select HAVE_REGS_AND_STACK_ACCESS_API
251 select HAVE_RELIABLE_STACKTRACE
253 select HAVE_SETUP_PER_CPU_AREA if PPC64
254 select HAVE_SOFTIRQ_ON_OWN_STACK
255 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
256 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
257 select HAVE_STATIC_CALL if PPC32
258 select HAVE_SYSCALL_TRACEPOINTS
259 select HAVE_VIRT_CPU_ACCOUNTING
260 select HUGETLB_PAGE_SIZE_VARIABLE if PPC_BOOK3S_64 && HUGETLB_PAGE
261 select IOMMU_HELPER if PPC64
263 select IRQ_FORCED_THREADING
264 select KASAN_VMALLOC if KASAN && MODULES
265 select MMU_GATHER_PAGE_SIZE
266 select MMU_GATHER_RCU_TABLE_FREE
267 select MMU_GATHER_MERGE_VMAS
268 select MODULES_USE_ELF_RELA
269 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
270 select NEED_PER_CPU_EMBED_FIRST_CHUNK if PPC64
271 select NEED_PER_CPU_PAGE_FIRST_CHUNK if PPC64
272 select NEED_SG_DMA_LENGTH
274 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
275 select OF_EARLY_FLATTREE
276 select OLD_SIGACTION if PPC32
277 select OLD_SIGSUSPEND
278 select PCI_DOMAINS if PCI
279 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
280 select PCI_SYSCALL if PCI
281 select PPC_DAWR if PPC64
284 select STRICT_KERNEL_RWX if STRICT_MODULE_RWX
285 select SYSCTL_EXCEPTION_TRACE
286 select THREAD_INFO_IN_TASK
287 select TRACE_IRQFLAGS_SUPPORT
289 # Please keep this list sorted alphabetically.
292 config PPC_LONG_DOUBLE_128
293 depends on PPC64 && ALTIVEC
294 def_bool $(success,test "$(shell,echo __LONG_DOUBLE_128__ | $(CC) -E -P -)" = 1)
296 config PPC_BARRIER_NOSPEC
299 depends on PPC_BOOK3S_64 || PPC_E500
301 config PPC_HAS_LBARX_LHARX
313 bool "Enable support for 32bit binaries"
315 depends on !CC_IS_CLANG || CLANG_VERSION >= 120000
316 default y if !CPU_LITTLE_ENDIAN
317 select ARCH_WANT_OLD_COMPAT_IPC
318 select COMPAT_OLD_SIGACTION
320 config SCHED_OMIT_FRAME_POINTER
324 config ARCH_MAY_HAVE_PC_FDC
328 config PPC_UDBG_16550
331 config GENERIC_TBSYNC
333 default y if PPC32 && SMP
344 config GENERIC_BUG_RELATIVE_POINTERS
346 depends on GENERIC_BUG
348 config SYS_SUPPORTS_APM_EMULATION
349 default y if PMAC_APM_EMU
355 Used to allow a board to specify it wants an ePAPR compliant wrapper.
357 config DEFAULT_UIMAGE
360 Used to allow a board to specify it wants a uImage built by default
362 config ARCH_HIBERNATION_POSSIBLE
366 config ARCH_SUSPEND_POSSIBLE
368 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
369 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
372 config ARCH_SUSPEND_NONZERO_CPU
374 depends on PPC_POWERNV || PPC_PSERIES
376 config ARCH_HAS_ADD_PAGES
378 depends on ARCH_ENABLE_MEMORY_HOTPLUG
380 config PPC_DCR_NATIVE
388 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
391 config PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
393 depends on !PPC_PMAC && !PPC_CHRP
394 bool "Assign PCI bus numbers from zero individually for each PCI domain"
396 By default on PPC32 were PCI bus numbers unique across all PCI domains.
397 So system could have only 256 PCI buses independently of available
398 PCI domains. When this option is enabled then PCI bus numbers are
399 PCI domain dependent and each PCI controller on own domain can have
400 256 PCI buses, like it is on other Linux architectures.
402 config PPC_OF_PLATFORM_PCI
405 depends on PPC64 # not supported on 32 bits yet
407 config ARCH_SUPPORTS_UPROBES
410 config PPC_ADV_DEBUG_REGS
412 depends on 40x || BOOKE
415 config PPC_ADV_DEBUG_IACS
417 depends on PPC_ADV_DEBUG_REGS
421 config PPC_ADV_DEBUG_DACS
423 depends on PPC_ADV_DEBUG_REGS
426 config PPC_ADV_DEBUG_DVCS
428 depends on PPC_ADV_DEBUG_REGS
432 config PPC_ADV_DEBUG_DAC_RANGE
434 depends on PPC_ADV_DEBUG_REGS && 44x
440 config PGTABLE_LEVELS
445 source "arch/powerpc/sysdev/Kconfig"
446 source "arch/powerpc/platforms/Kconfig"
448 menu "Kernel options"
451 bool "High memory support"
455 source "kernel/Kconfig.hz"
457 config MATH_EMULATION
458 bool "Math emulation"
459 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT
462 Some PowerPC chips designed for embedded applications do not have
463 a floating-point unit and therefore do not implement the
464 floating-point instructions in the PowerPC instruction set. If you
465 say Y here, the kernel will include code to emulate a floating-point
466 unit, which will allow programs that use floating-point
469 This is also useful to emulate missing (optional) instructions
470 such as fsqrt on cores that do have an FPU but do not implement
471 them (such as Freescale BookE).
474 prompt "Math emulation options"
475 default MATH_EMULATION_FULL
476 depends on MATH_EMULATION
478 config MATH_EMULATION_FULL
479 bool "Emulate all the floating point instructions"
481 Select this option will enable the kernel to support to emulate
482 all the floating point instructions. If your SoC doesn't have
483 a FPU, you should select this.
485 config MATH_EMULATION_HW_UNIMPLEMENTED
486 bool "Just emulate the FPU unimplemented instructions"
488 Select this if you know there does have a hardware FPU on your
489 SoC, but some floating point instructions are not implemented by that.
493 config PPC_TRANSACTIONAL_MEM
494 bool "Transactional Memory support for POWERPC"
495 depends on PPC_BOOK3S_64
500 Support user-mode Transactional Memory on POWERPC.
503 bool "Ultravisor support"
504 depends on KVM_BOOK3S_HV_POSSIBLE
505 depends on DEVICE_PRIVATE
508 This option paravirtualizes the kernel to run in POWER platforms that
509 supports the Protected Execution Facility (PEF). On such platforms,
510 the ultravisor firmware runs at a privilege level above the
515 config LD_HEAD_STUB_CATCH
516 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
519 Very large kernels can cause linker branch stubs to be generated by
520 code in head_64.S, which moves the head text sections out of their
521 specified location. This option can work around the problem.
525 config MPROFILE_KERNEL
526 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
527 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
530 bool "Support for enabling/disabling CPUs"
531 depends on SMP && (PPC_PSERIES || \
532 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
534 Say Y here to be able to disable and re-enable individual
535 CPUs at runtime on SMP machines.
537 Say N if you are unsure.
539 config INTERRUPT_SANITIZE_REGISTERS
540 bool "Clear gprs on interrupt arrival"
541 depends on PPC64 && ARCH_HAS_SYSCALL_WRAPPER
542 default PPC_BOOK3E_64 || PPC_PSERIES || PPC_POWERNV
544 Reduce the influence of user register state on interrupt handlers and
545 syscalls through clearing user state from registers before handling
548 config PPC_QUEUED_SPINLOCKS
549 bool "Queued spinlocks" if EXPERT
551 default PPC_BOOK3S_64
553 Say Y here to use queued spinlocks which give better scalability and
554 fairness on large SMP and NUMA systems without harming single threaded
557 config ARCH_CPU_PROBE_RELEASE
559 depends on HOTPLUG_CPU
561 config PPC64_SUPPORTS_MEMORY_FAILURE
562 bool "Add support for memory hwpoison"
563 depends on PPC_BOOK3S_64
564 default "y" if PPC_POWERNV
565 select ARCH_SUPPORTS_MEMORY_FAILURE
568 bool "kexec system call"
569 depends on PPC_BOOK3S || PPC_E500 || (44x && !SMP)
572 kexec is a system call that implements the ability to shutdown your
573 current kernel, and to start another kernel. It is like a reboot
574 but it is independent of the system firmware. And like a reboot
575 you can start any kernel with it, not just Linux.
577 The name comes from the similarity to the exec system call.
579 It is an ongoing process to be certain the hardware in a machine
580 is properly shutdown, so do not be surprised if this code does not
581 initially work for you. As of this writing the exact hardware
582 interface is strongly in flux, so no good recommendation can be
586 bool "kexec file based system call"
588 select HAVE_IMA_KEXEC if IMA
592 depends on CRYPTO_SHA256=y
594 This is a new version of the kexec system call. This call is
595 file based and takes in file descriptors as system call arguments
596 for kernel and initramfs as opposed to a list of segments as is the
597 case for the older kexec call.
599 config ARCH_HAS_KEXEC_PURGATORY
602 config PPC64_BIG_ENDIAN_ELF_ABI_V2
603 bool "Build big-endian kernel using ELF ABI V2 (EXPERIMENTAL)"
604 depends on PPC64 && CPU_BIG_ENDIAN
605 depends on CC_HAS_ELFV2
606 depends on LD_IS_BFD && LD_VERSION >= 22400
609 This builds the kernel image using the "Power Architecture 64-Bit ELF
610 V2 ABI Specification", which has a reduced stack overhead and faster
611 function calls. This internal kernel ABI option does not affect
612 userspace compatibility.
614 The V2 ABI is standard for 64-bit little-endian, but for big-endian
615 it is less well tested by kernel and toolchain. However some distros
616 build userspace this way, and it can produce a functioning kernel.
618 This requires GCC and binutils 2.24 or newer.
621 bool "Build a relocatable kernel"
622 depends on PPC64 || (FLATMEM && (44x || PPC_85xx))
623 select NONSTATIC_KERNEL
625 This builds a kernel image that is capable of running at the
626 location the kernel is loaded at. For ppc32, there is no any
627 alignment restrictions, and this feature is a superset of
628 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
629 16k-aligned base address. The kernel is linked as a
630 position-independent executable (PIE) and contains dynamic relocations
631 which are processed early in the bootup process.
633 One use is for the kexec on panic case where the recovery kernel
634 must live at a different physical address than the primary
637 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
638 it has been loaded at and the compile time physical addresses
639 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
640 setting can still be useful to bootwrappers that need to know the
641 load address of the kernel (eg. u-boot/mkimage).
643 config RANDOMIZE_BASE
644 bool "Randomize the address of the kernel image"
645 depends on PPC_85xx && FLATMEM
646 depends on RELOCATABLE
648 Randomizes the virtual address at which the kernel image is
649 loaded, as a security feature that deters exploit attempts
650 relying on knowledge of the location of kernel internals.
654 config RELOCATABLE_TEST
655 bool "Test relocatable kernel"
656 depends on (PPC64 && RELOCATABLE)
658 This runs the relocatable kernel at the address it was initially
659 loaded at, which tends to be non-zero and therefore test the
663 bool "Build a dump capture kernel"
664 depends on PPC64 || PPC_BOOK3S_32 || PPC_85xx || (44x && !SMP)
665 select RELOCATABLE if PPC64 || 44x || PPC_85xx
667 Build a kernel suitable for use as a dump capture kernel.
668 The same kernel binary can be used as production kernel and dump
672 bool "Firmware-assisted dump"
673 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
677 A robust mechanism to get reliable kernel crash dump with
678 assistance from firmware. This approach does not use kexec,
679 instead firmware assists in booting the capture kernel
680 while preserving memory contents. Firmware-assisted dump
681 is meant to be a kdump replacement offering robustness and
682 speed not possible without system firmware assistance.
684 If unsure, say "y". Only special kernels like petitboot may
685 need to say "N" here.
687 config PRESERVE_FA_DUMP
688 bool "Preserve Firmware-assisted dump"
689 depends on PPC64 && PPC_POWERNV && !FA_DUMP
691 On a kernel with FA_DUMP disabled, this option helps to preserve
692 crash data from a previously crash'ed kernel. Useful when the next
693 memory preserving kernel boot would process this crash data.
694 Petitboot kernel is the typical usecase for this option.
697 bool "Export OPAL memory as /sys/firmware/opal/core"
698 depends on PPC64 && PPC_POWERNV
700 This option uses the MPIPL support in firmware to provide an
701 ELF core of OPAL memory after a crash. The ELF core is exported
702 as /sys/firmware/opal/core file which is helpful in debugging
703 OPAL crashes using GDB.
706 bool "Distribute interrupts on all CPUs by default"
709 This option gives the kernel permission to distribute IRQs across
710 multiple CPUs. Saying N here will route all IRQs to the first
711 CPU. Generally saying Y is safe, although some problems have been
712 reported with SMP Power Macintoshes with this option enabled.
715 bool "NUMA Memory Allocation and Scheduler Support"
716 depends on PPC64 && SMP
717 default y if PPC_PSERIES || PPC_POWERNV
718 select USE_PERCPU_NUMA_NODE_ID
720 Enable NUMA (Non-Uniform Memory Access) support.
722 The kernel will try to allocate memory used by a CPU on the
723 local memory controller of the CPU and add some more
724 NUMA awareness to the kernel.
732 config HAVE_MEMORYLESS_NODES
736 config ARCH_SELECT_MEMORY_MODEL
740 config ARCH_FLATMEM_ENABLE
742 depends on (PPC64 && !NUMA) || PPC32
744 config ARCH_SPARSEMEM_ENABLE
747 select SPARSEMEM_VMEMMAP_ENABLE
749 config ARCH_SPARSEMEM_DEFAULT
751 depends on PPC_BOOK3S_64
753 config ILLEGAL_POINTER_VALUE
755 # This is roughly half way between the top of user space and the bottom
756 # of kernel space, which seems about as good as we can get.
757 default 0x5deadbeef0000000 if PPC64
760 config ARCH_MEMORY_PROBE
762 depends on MEMORY_HOTPLUG
766 default PPC_64K_PAGES if PPC_BOOK3S_64
769 Select the kernel logical page size. Increasing the page size
770 will reduce software overhead at each page boundary, allow
771 hardware prefetch mechanisms to be more effective, and allow
772 larger dma transfers increasing IO efficiency and reducing
773 overhead. However the utilization of memory will increase.
774 For example, each cached file will using a multiple of the
775 page size to hold its contents and the difference between the
776 end of file and the end of page is wasted.
778 Some dedicated systems, such as software raid serving with
779 accelerated calculations, have shown significant increases.
781 If you configure a 64 bit kernel for 64k pages but the
782 processor does not support them, then the kernel will simulate
783 them with 4k pages, loading them on demand, but with the
784 reduced software overhead and larger internal fragmentation.
785 For the 32 bit kernel, a large page option will not be offered
786 unless it is supported by the configured processor.
788 If unsure, choose 4K_PAGES.
792 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
796 depends on 44x || PPC_8xx
800 depends on 44x || PPC_BOOK3S_64
801 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
803 config PPC_256K_PAGES
804 bool "256k page size (Requires non-standard binutils settings)"
805 depends on 44x && !PPC_47x
807 Make the page size 256k.
809 The kernel will only be able to run applications that have been
810 compiled with '-zmax-page-size' set to 256K (the default is 64K) using
811 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
812 definition from 0x10000 to 0x40000 in older versions.
818 depends on PPC_4K_PAGES
820 config PAGE_SIZE_16KB
822 depends on PPC_16K_PAGES
824 config PAGE_SIZE_64KB
826 depends on PPC_64K_PAGES
828 config PAGE_SIZE_256KB
830 depends on PPC_256K_PAGES
832 config PPC_PAGE_SHIFT
834 default 18 if PPC_256K_PAGES
835 default 16 if PPC_64K_PAGES
836 default 14 if PPC_16K_PAGES
840 int "Thread shift" if EXPERT
842 default "15" if PPC_256K_PAGES
843 default "14" if PPC64
846 Used to define the stack size. The default is almost always what you
847 want. Only change this if you know what you are doing.
849 config DATA_SHIFT_BOOL
850 bool "Set custom data alignment"
851 depends on ADVANCED_OPTIONS
852 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE
853 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX) || \
856 This option allows you to set the kernel data alignment. When
857 RAM is mapped by blocks, the alignment needs to fit the size and
858 number of possible blocks. The default should be OK for most configs.
860 Say N here unless you know what you are doing.
863 int "Data shift" if DATA_SHIFT_BOOL
864 default 24 if STRICT_KERNEL_RWX && PPC64
865 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
866 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
867 range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_85xx
868 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
869 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
870 default 23 if STRICT_KERNEL_RWX && PPC_8xx
871 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA
872 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
873 default 24 if STRICT_KERNEL_RWX && PPC_85xx
874 default PPC_PAGE_SHIFT
876 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
877 Smaller is the alignment, greater is the number of necessary DBATs.
879 On 8xx, large pages (512kb or 8M) are used to map kernel linear
880 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
881 in that case. If PIN_TLB is selected, it must be aligned to 8M as
882 8M pages will be pinned.
884 config ARCH_FORCE_MAX_ORDER
885 int "Maximum zone order"
886 range 8 9 if PPC64 && PPC_64K_PAGES
887 default "9" if PPC64 && PPC_64K_PAGES
888 range 13 13 if PPC64 && !PPC_64K_PAGES
889 default "13" if PPC64 && !PPC_64K_PAGES
890 range 9 64 if PPC32 && PPC_16K_PAGES
891 default "9" if PPC32 && PPC_16K_PAGES
892 range 7 64 if PPC32 && PPC_64K_PAGES
893 default "7" if PPC32 && PPC_64K_PAGES
894 range 5 64 if PPC32 && PPC_256K_PAGES
895 default "5" if PPC32 && PPC_256K_PAGES
899 The kernel memory allocator divides physically contiguous memory
900 blocks into "zones", where each zone is a power of two number of
901 pages. This option selects the largest power of two that the kernel
902 keeps in the memory allocator. If you need to allocate very large
903 blocks of physically contiguous memory, then you may need to
906 This config option is actually maximum order plus one. For example,
907 a value of 11 means that the largest free memory block is 2^10 pages.
909 The page size is not necessarily 4KB. For example, on 64-bit
910 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
911 this in mind when choosing a value for this option.
913 config PPC_SUBPAGE_PROT
914 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
916 depends on PPC_64S_HASH_MMU && PPC_64K_PAGES
918 This option adds support for system call to allow user programs
919 to set access permissions (read/write, readonly, or no access)
920 on the 4k subpages of each 64k page.
922 If unsure, say N here.
924 config PPC_PROT_SAO_LPAR
925 bool "Support PROT_SAO mappings in LPARs"
926 depends on PPC_BOOK3S_64
928 This option adds support for PROT_SAO mappings from userspace
929 inside LPARs on supported CPUs.
931 This may cause issues when performing guest migration from
932 a CPU that supports SAO to one that does not.
934 If unsure, say N here.
936 config PPC_COPRO_BASE
940 bool "SMT (Hyperthreading) scheduler support"
941 depends on PPC64 && SMP
943 SMT scheduler support improves the CPU scheduler's decision making
944 when dealing with POWER5 cpus at a cost of slightly increased
945 overhead in some places. If unsure say N here.
947 config PPC_DENORMALISATION
948 bool "PowerPC denormalisation exception handling"
949 depends on PPC_BOOK3S_64
950 default "y" if PPC_POWERNV
952 Add support for handling denormalisation of single precision
953 values. Useful for bare metal only. If unsure say Y here.
956 string "Initial kernel command string"
959 On some platforms, there is currently no way for the boot loader to
960 pass arguments to the kernel. For these platforms, you can supply
961 some command-line options at build time by entering them here. In
962 most cases you will need to specify the root device here.
965 prompt "Kernel command line type" if CMDLINE != ""
966 default CMDLINE_FROM_BOOTLOADER
968 config CMDLINE_FROM_BOOTLOADER
969 bool "Use bootloader kernel arguments if available"
971 Uses the command-line options passed by the boot loader. If
972 the boot loader doesn't provide any, the default kernel command
973 string provided in CMDLINE will be used.
975 config CMDLINE_EXTEND
976 bool "Extend bootloader kernel arguments"
978 The command-line arguments provided by the boot loader will be
979 appended to the default kernel command string.
982 bool "Always use the default kernel command string"
984 Always use the default kernel command string, even if the boot
985 loader passes other arguments to the kernel.
986 This is useful if you cannot or don't want to change the
987 command-line options your boot loader passes to the kernel.
992 string "Additional default image types"
994 List additional targets to be built by the bootwrapper here (separated
995 by spaces). This is useful for targets that depend of device tree
996 files in the .dts directory.
998 Targets in this list will be build as part of the default build
999 target, or when the user does a 'make zImage' or a
1000 'make zImage.initrd'.
1002 If unsure, leave blank
1004 config ARCH_WANTS_FREEZER_CONTROL
1008 source "kernel/power/Kconfig"
1011 prompt "PowerPC Memory Protection Keys"
1013 depends on PPC_BOOK3S_64
1014 depends on PPC_64S_HASH_MMU
1015 select ARCH_USES_HIGH_VMA_FLAGS
1016 select ARCH_HAS_PKEYS
1018 Memory Protection Keys provides a mechanism for enforcing
1019 page-based protections, but without requiring modification of the
1020 page tables when an application changes protection domains.
1022 For details, see Documentation/core-api/protection-keys.rst
1026 config PPC_SECURE_BOOT
1027 prompt "Enable secure boot support"
1029 depends on PPC_POWERNV || PPC_PSERIES
1030 depends on IMA_ARCH_POLICY
1031 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
1033 Systems with firmware secure boot enabled need to define security
1034 policies to extend secure boot to the OS. This config allows a user
1035 to enable OS secure boot on systems that have firmware support for
1036 it. If in doubt say N.
1038 config PPC_SECVAR_SYSFS
1039 bool "Enable sysfs interface for POWER secure variables"
1041 depends on PPC_SECURE_BOOT
1044 POWER secure variables are managed and controlled by firmware.
1045 These variables are exposed to userspace via sysfs to enable
1046 read/write operations on these variables. Say Y if you have
1047 secure boot enabled and want to expose variables to userspace.
1058 bool "Support for ISA-bus hardware"
1062 Find out whether you have ISA slots on your motherboard. ISA is the
1063 name of a bus system, i.e. the way the CPU talks to the other stuff
1064 inside your box. If you have an Apple machine, say N here; if you
1065 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1066 embedded board, consult your board documentation.
1068 config GENERIC_ISA_DMA
1070 depends on ISA_DMA_API
1073 config PPC_INDIRECT_PCI
1076 default y if 40x || 44x
1086 select ARCH_HAS_DMA_SET_MASK
1087 select PPC_INDIRECT_PCI
1093 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1095 Freescale MPC85xx/MPC86xx power management controller support
1096 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1101 depends on SUSPEND && (44x || 40x)
1103 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1104 It also enables support for two different idle states (idle-wait
1111 bool "Freescale Local Bus support"
1113 Enables reporting of errors from the Freescale local bus
1114 controller. Also contains some common code used by
1115 drivers for specific local bus peripherals.
1119 depends on PPC_83xx || QUICC_ENGINE || CPM2
1121 Freescale General-purpose Timers support
1125 depends on PCI && 8260
1126 select PPC_INDIRECT_PCI
1130 bool "Freescale Embedded SRIO Controller support"
1131 depends on RAPIDIO = y && HAVE_RAPIDIO
1134 Include support for RapidIO controller on Freescale embedded
1135 processors (MPC8548, MPC8641, etc).
1139 config NONSTATIC_KERNEL
1142 menu "Advanced setup"
1145 config ADVANCED_OPTIONS
1146 bool "Prompt for advanced kernel configuration options"
1148 This option will enable prompting for a variety of advanced kernel
1149 configuration options. These options can cause the kernel to not
1150 work if they are set incorrectly, but can be used to optimize certain
1151 aspects of kernel memory management.
1153 Unless you know what you are doing, say N here.
1155 comment "Default settings for advanced configuration options are used"
1156 depends on !ADVANCED_OPTIONS
1158 config LOWMEM_SIZE_BOOL
1159 bool "Set maximum low memory"
1160 depends on ADVANCED_OPTIONS
1162 This option allows you to set the maximum amount of memory which
1163 will be used as "low memory", that is, memory which the kernel can
1164 access directly, without having to set up a kernel virtual mapping.
1165 This can be useful in optimizing the layout of kernel virtual
1168 Say N here unless you know what you are doing.
1171 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1172 default "0x30000000"
1174 config LOWMEM_CAM_NUM_BOOL
1175 bool "Set number of CAMs to use to map low memory"
1176 depends on ADVANCED_OPTIONS && PPC_85xx
1178 This option allows you to set the maximum number of CAM slots that
1179 will be used to map low memory. There are a limited number of slots
1180 available and even more limited number that will fit in the L1 MMU.
1181 However, using more entries will allow mapping more low memory. This
1182 can be useful in optimizing the layout of kernel virtual memory.
1184 Say N here unless you know what you are doing.
1186 config LOWMEM_CAM_NUM
1188 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1189 default 3 if !STRICT_KERNEL_RWX
1190 default 9 if DATA_SHIFT >= 24
1191 default 12 if DATA_SHIFT >= 22
1194 config DYNAMIC_MEMSTART
1195 bool "Enable page aligned dynamic load address for kernel"
1196 depends on ADVANCED_OPTIONS && FLATMEM && (PPC_85xx || 44x)
1197 select NONSTATIC_KERNEL
1199 This option enables the kernel to be loaded at any page aligned
1200 physical address. The kernel creates a mapping from KERNELBASE to
1201 the address where the kernel is loaded. The page size here implies
1202 the TLB page size of the mapping for kernel on the particular platform.
1203 Please refer to the init code for finding the TLB page size.
1205 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1206 kernel image, where the only restriction is the page aligned kernel
1207 load address. When this option is enabled, the compile time physical
1208 address CONFIG_PHYSICAL_START is ignored.
1210 This option is overridden by CONFIG_RELOCATABLE
1212 config PAGE_OFFSET_BOOL
1213 bool "Set custom page offset address"
1214 depends on ADVANCED_OPTIONS
1216 This option allows you to set the kernel virtual address at which
1217 the kernel will map low memory. This can be useful in optimizing
1218 the virtual memory layout of the system.
1220 Say N here unless you know what you are doing.
1223 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1224 default "0xc0000000"
1226 config KERNEL_START_BOOL
1227 bool "Set custom kernel base address"
1228 depends on ADVANCED_OPTIONS
1230 This option allows you to set the kernel virtual address at which
1231 the kernel will be loaded. Normally this should match PAGE_OFFSET
1232 however there are times (like kdump) that one might not want them
1235 Say N here unless you know what you are doing.
1238 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1239 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1240 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1241 default "0xc0000000"
1243 config PHYSICAL_START_BOOL
1244 bool "Set physical address where the kernel is loaded"
1245 depends on ADVANCED_OPTIONS && FLATMEM && PPC_85xx
1247 This gives the physical address where the kernel is loaded.
1249 Say N here unless you know what you are doing.
1251 config PHYSICAL_START
1252 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1253 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1254 default "0x00000000"
1256 config PHYSICAL_ALIGN
1258 default "0x04000000" if PPC_85xx
1260 This value puts the alignment restrictions on physical address
1261 where kernel is loaded and run from. Kernel is compiled for an
1262 address which meets above alignment restriction.
1264 config TASK_SIZE_BOOL
1265 bool "Set custom user task size"
1266 depends on ADVANCED_OPTIONS
1268 This option allows you to set the amount of virtual address space
1269 allocated to user tasks. This can be useful in optimizing the
1270 virtual memory layout of the system.
1272 Say N here unless you know what you are doing.
1275 hex "Size of user task space" if TASK_SIZE_BOOL
1276 default "0x80000000" if PPC_8xx
1277 default "0xb0000000" if PPC_BOOK3S_32
1278 default "0xc0000000"
1282 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1285 default "0xc000000000000000"
1288 default "0xc000000000000000"
1289 config PHYSICAL_START
1291 default "0x00000000"
1294 config PPC_LIB_RHEAP
1297 source "arch/powerpc/kvm/Kconfig"
1299 source "kernel/livepatch/Kconfig"