1 # SPDX-License-Identifier: GPL-2.0
2 source "arch/powerpc/platforms/Kconfig.cputype"
16 config ARCH_MMAP_RND_BITS_MAX
17 # On Book3S 64, the default virtual address space for 64-bit processes
18 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
19 # 32T of address space (2^45), which should ensure a reasonable gap
20 # between bottom-up and top-down allocations for applications that
21 # consume "normal" amounts of address space. Book3S 64 only supports 64K
23 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
24 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K)
26 # On all other 64-bit platforms (currently only Book3E), the virtual
27 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
28 # of address space (2^44). Only 4K page sizes are supported.
29 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K)
31 # For 32-bit, use the compat values, as they're the same.
32 default ARCH_MMAP_RND_COMPAT_BITS_MAX
34 config ARCH_MMAP_RND_BITS_MIN
35 # Allow randomisation to consume up to 1GB of address space (2^30).
36 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K)
37 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K)
39 # For 32-bit, use the compat values, as they're the same.
40 default ARCH_MMAP_RND_COMPAT_BITS_MIN
42 config ARCH_MMAP_RND_COMPAT_BITS_MAX
43 # Total virtual address space for 32-bit processes is 2^31 (2GB).
44 # Allow randomisation to consume up to 512MB of address space (2^29).
45 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K)
46 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K)
47 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K)
48 default 17 # 17 = 29 (512MB) - 12 (4K)
50 config ARCH_MMAP_RND_COMPAT_BITS_MIN
51 # Total virtual address space for 32-bit processes is 2^31 (2GB).
52 # Allow randomisation to consume up to 8MB of address space (2^23).
53 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K)
54 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K)
55 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K)
56 default 11 # 11 = 23 (8MB) - 12 (4K)
58 config HAVE_SETUP_PER_CPU_AREA
61 config NEED_PER_CPU_EMBED_FIRST_CHUNK
64 config NEED_PER_CPU_PAGE_FIRST_CHUNK
68 int "Number of virtual interrupt numbers"
72 This defines the number of virtual interrupt numbers the kernel
73 can manage. Virtual interrupt numbers are what you see in
74 /proc/interrupts. If you configure your system to have too few,
75 drivers will fail to load or worse - handle with care.
79 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
84 depends on HARDLOCKUP_DETECTOR
85 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
88 This is a placeholder when the powerpc hardlockup detector
89 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
90 selected via the generic lockup detector menu which is why we
91 have no standalone config option for it here.
93 config STACKTRACE_SUPPORT
97 config TRACE_IRQFLAGS_SUPPORT
101 config LOCKDEP_SUPPORT
105 config GENERIC_LOCKBREAK
108 depends on SMP && PREEMPTION
110 config GENERIC_HWEIGHT
118 # Please keep this list sorted alphabetically.
120 select ARCH_32BIT_OFF_T if PPC32
121 select ARCH_HAS_DEBUG_VIRTUAL
122 select ARCH_HAS_DEVMEM_IS_ALLOWED
123 select ARCH_HAS_ELF_RANDOMIZE
124 select ARCH_HAS_FORTIFY_SOURCE
125 select ARCH_HAS_GCOV_PROFILE_ALL
127 select ARCH_HAS_HUGEPD if HUGETLB_PAGE
128 select ARCH_HAS_MEMREMAP_COMPAT_ALIGN
129 select ARCH_HAS_MMIOWB if PPC64
130 select ARCH_HAS_PHYS_TO_DMA
131 select ARCH_HAS_PMEM_API
132 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
133 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
134 select ARCH_HAS_PTE_SPECIAL
135 select ARCH_HAS_MEMBARRIER_CALLBACKS
136 select ARCH_HAS_MEMBARRIER_SYNC_CORE
137 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
138 select ARCH_HAS_STRICT_KERNEL_RWX if (PPC32 && !HIBERNATION)
139 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
140 select ARCH_HAS_UACCESS_FLUSHCACHE
141 select ARCH_HAS_COPY_MC if PPC64
142 select ARCH_HAS_UBSAN_SANITIZE_ALL
143 select ARCH_HAVE_NMI_SAFE_CMPXCHG
144 select ARCH_KEEP_MEMBLOCK
145 select ARCH_MIGHT_HAVE_PC_PARPORT
146 select ARCH_MIGHT_HAVE_PC_SERIO
147 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
148 select ARCH_SUPPORTS_ATOMIC_RMW
149 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC32 || PPC_BOOK3S_64
150 select ARCH_USE_BUILTIN_BSWAP
151 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
152 select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS
153 select ARCH_USE_QUEUED_SPINLOCKS if PPC_QUEUED_SPINLOCKS
154 select ARCH_WANT_IPC_PARSE_VERSION
155 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
156 select ARCH_WANT_LD_ORPHAN_WARN
157 select ARCH_WEAK_RELEASE_ACQUIRE
159 select BUILDTIME_TABLE_SORT
160 select CLONE_BACKWARDS
161 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
162 select DMA_OPS if PPC64
163 select DMA_OPS_BYPASS if PPC64
164 select ARCH_HAS_DMA_MAP_DIRECT if PPC64 && PPC_PSERIES
165 select DYNAMIC_FTRACE if FUNCTION_TRACER
166 select EDAC_ATOMIC_SCRUB
168 select GENERIC_ATOMIC64 if PPC32
169 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
170 select GENERIC_CMOS_UPDATE
171 select GENERIC_CPU_AUTOPROBE
172 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
173 select GENERIC_EARLY_IOREMAP
174 select GENERIC_IRQ_SHOW
175 select GENERIC_IRQ_SHOW_LEVEL
176 select GENERIC_PCI_IOMAP if PCI
177 select GENERIC_SMP_IDLE_THREAD
178 select GENERIC_STRNCPY_FROM_USER
179 select GENERIC_STRNLEN_USER
180 select GENERIC_TIME_VSYSCALL
181 select GENERIC_GETTIMEOFDAY
182 select HAVE_ARCH_AUDITSYSCALL
183 select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
184 select HAVE_ARCH_JUMP_LABEL
185 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
186 select HAVE_ARCH_KASAN_VMALLOC if PPC32 && PPC_PAGE_SHIFT <= 14
187 select HAVE_ARCH_KGDB
188 select HAVE_ARCH_MMAP_RND_BITS
189 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
190 select HAVE_ARCH_NVRAM_OPS
191 select HAVE_ARCH_SECCOMP_FILTER
192 select HAVE_ARCH_TRACEHOOK
193 select HAVE_ASM_MODVERSIONS
194 select HAVE_C_RECORDMCOUNT
195 select HAVE_CBPF_JIT if !PPC64
196 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
197 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
198 select HAVE_CONTEXT_TRACKING if PPC64
199 select HAVE_DEBUG_KMEMLEAK
200 select HAVE_DEBUG_STACKOVERFLOW
201 select HAVE_DYNAMIC_FTRACE
202 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
203 select HAVE_EBPF_JIT if PPC64
204 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
206 select HAVE_FTRACE_MCOUNT_RECORD
207 select HAVE_FUNCTION_ERROR_INJECTION
208 select HAVE_FUNCTION_GRAPH_TRACER
209 select HAVE_FUNCTION_TRACER
210 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
211 select HAVE_GENERIC_VDSO
212 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
214 select HAVE_IOREMAP_PROT
215 select HAVE_IRQ_EXIT_ON_IRQ_STACK
216 select HAVE_KERNEL_GZIP
217 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
218 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
219 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
221 select HAVE_KPROBES_ON_FTRACE
222 select HAVE_KRETPROBES
223 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
224 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
225 select HAVE_MOD_ARCH_SPECIFIC
226 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
227 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
228 select HAVE_OPTPROBES if PPC64
229 select HAVE_PERF_EVENTS
230 select HAVE_PERF_EVENTS_NMI if PPC64
231 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
232 select HAVE_PERF_REGS
233 select HAVE_PERF_USER_STACK_DUMP
234 select MMU_GATHER_RCU_TABLE_FREE
235 select MMU_GATHER_PAGE_SIZE
236 select HAVE_REGS_AND_STACK_ACCESS_API
237 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
238 select HAVE_SYSCALL_TRACEPOINTS
239 select HAVE_VIRT_CPU_ACCOUNTING
240 select HAVE_IRQ_TIME_ACCOUNTING
242 select IOMMU_HELPER if PPC64
244 select IRQ_FORCED_THREADING
245 select MODULES_USE_ELF_RELA
246 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
247 select NEED_SG_DMA_LENGTH
249 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
250 select OF_EARLY_FLATTREE
251 select OLD_SIGACTION if PPC32
252 select OLD_SIGSUSPEND
253 select PCI_DOMAINS if PCI
254 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
255 select PCI_SYSCALL if PCI
256 select PPC_DAWR if PPC64
259 select SYSCTL_EXCEPTION_TRACE
260 select THREAD_INFO_IN_TASK
261 select VIRT_TO_BUS if !PPC64
263 # Please keep this list sorted alphabetically.
266 config PPC_BARRIER_NOSPEC
269 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
280 bool "Enable support for 32bit binaries"
282 default y if !CPU_LITTLE_ENDIAN
283 select ARCH_WANT_OLD_COMPAT_IPC
284 select COMPAT_OLD_SIGACTION
286 config SYSVIPC_COMPAT
288 depends on COMPAT && SYSVIPC
291 config SCHED_OMIT_FRAME_POINTER
295 config ARCH_MAY_HAVE_PC_FDC
299 config PPC_UDBG_16550
302 config GENERIC_TBSYNC
304 default y if PPC32 && SMP
315 config GENERIC_BUG_RELATIVE_POINTERS
317 depends on GENERIC_BUG
319 config SYS_SUPPORTS_APM_EMULATION
320 default y if PMAC_APM_EMU
326 Used to allow a board to specify it wants an ePAPR compliant wrapper.
328 config DEFAULT_UIMAGE
331 Used to allow a board to specify it wants a uImage built by default
333 config ARCH_HIBERNATION_POSSIBLE
337 config ARCH_SUSPEND_POSSIBLE
339 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
340 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
343 config ARCH_SUSPEND_NONZERO_CPU
345 depends on PPC_POWERNV || PPC_PSERIES
347 config PPC_DCR_NATIVE
355 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
358 config PPC_OF_PLATFORM_PCI
361 depends on PPC64 # not supported on 32 bits yet
363 config ARCH_SUPPORTS_UPROBES
366 config PPC_ADV_DEBUG_REGS
368 depends on 40x || BOOKE
371 config PPC_ADV_DEBUG_IACS
373 depends on PPC_ADV_DEBUG_REGS
377 config PPC_ADV_DEBUG_DACS
379 depends on PPC_ADV_DEBUG_REGS
382 config PPC_ADV_DEBUG_DVCS
384 depends on PPC_ADV_DEBUG_REGS
388 config PPC_ADV_DEBUG_DAC_RANGE
390 depends on PPC_ADV_DEBUG_REGS && 44x
398 default y if PPC_BOOK3E_64
400 config PGTABLE_LEVELS
405 source "arch/powerpc/sysdev/Kconfig"
406 source "arch/powerpc/platforms/Kconfig"
408 menu "Kernel options"
411 bool "High memory support"
415 source "kernel/Kconfig.hz"
417 config HUGETLB_PAGE_SIZE_VARIABLE
419 depends on HUGETLB_PAGE && PPC_BOOK3S_64
422 config MATH_EMULATION
423 bool "Math emulation"
424 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
427 Some PowerPC chips designed for embedded applications do not have
428 a floating-point unit and therefore do not implement the
429 floating-point instructions in the PowerPC instruction set. If you
430 say Y here, the kernel will include code to emulate a floating-point
431 unit, which will allow programs that use floating-point
434 This is also useful to emulate missing (optional) instructions
435 such as fsqrt on cores that do have an FPU but do not implement
436 them (such as Freescale BookE).
439 prompt "Math emulation options"
440 default MATH_EMULATION_FULL
441 depends on MATH_EMULATION
443 config MATH_EMULATION_FULL
444 bool "Emulate all the floating point instructions"
446 Select this option will enable the kernel to support to emulate
447 all the floating point instructions. If your SoC doesn't have
448 a FPU, you should select this.
450 config MATH_EMULATION_HW_UNIMPLEMENTED
451 bool "Just emulate the FPU unimplemented instructions"
453 Select this if you know there does have a hardware FPU on your
454 SoC, but some floating point instructions are not implemented by that.
458 config PPC_TRANSACTIONAL_MEM
459 bool "Transactional Memory support for POWERPC"
460 depends on PPC_BOOK3S_64
465 Support user-mode Transactional Memory on POWERPC.
468 bool "Ultravisor support"
469 depends on KVM_BOOK3S_HV_POSSIBLE
470 depends on DEVICE_PRIVATE
473 This option paravirtualizes the kernel to run in POWER platforms that
474 supports the Protected Execution Facility (PEF). On such platforms,
475 the ultravisor firmware runs at a privilege level above the
480 config LD_HEAD_STUB_CATCH
481 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
484 Very large kernels can cause linker branch stubs to be generated by
485 code in head_64.S, which moves the head text sections out of their
486 specified location. This option can work around the problem.
490 config MPROFILE_KERNEL
491 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
492 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
495 bool "Support for enabling/disabling CPUs"
496 depends on SMP && (PPC_PSERIES || \
497 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
499 Say Y here to be able to disable and re-enable individual
500 CPUs at runtime on SMP machines.
502 Say N if you are unsure.
504 config PPC_QUEUED_SPINLOCKS
505 bool "Queued spinlocks" if EXPERT
507 default PPC_BOOK3S_64
509 Say Y here to use queued spinlocks which give better scalability and
510 fairness on large SMP and NUMA systems without harming single threaded
513 config ARCH_CPU_PROBE_RELEASE
515 depends on HOTPLUG_CPU
517 config ARCH_ENABLE_MEMORY_HOTPLUG
520 config ARCH_ENABLE_MEMORY_HOTREMOVE
523 config PPC64_SUPPORTS_MEMORY_FAILURE
524 bool "Add support for memory hwpoison"
525 depends on PPC_BOOK3S_64
526 default "y" if PPC_POWERNV
527 select ARCH_SUPPORTS_MEMORY_FAILURE
530 bool "kexec system call"
531 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
534 kexec is a system call that implements the ability to shutdown your
535 current kernel, and to start another kernel. It is like a reboot
536 but it is independent of the system firmware. And like a reboot
537 you can start any kernel with it, not just Linux.
539 The name comes from the similarity to the exec system call.
541 It is an ongoing process to be certain the hardware in a machine
542 is properly shutdown, so do not be surprised if this code does not
543 initially work for you. As of this writing the exact hardware
544 interface is strongly in flux, so no good recommendation can be
548 bool "kexec file based system call"
550 select HAVE_IMA_KEXEC
555 depends on CRYPTO_SHA256=y
557 This is a new version of the kexec system call. This call is
558 file based and takes in file descriptors as system call arguments
559 for kernel and initramfs as opposed to a list of segments as is the
560 case for the older kexec call.
562 config ARCH_HAS_KEXEC_PURGATORY
566 bool "Build a relocatable kernel"
567 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
568 select NONSTATIC_KERNEL
569 select MODULE_REL_CRCS if MODVERSIONS
571 This builds a kernel image that is capable of running at the
572 location the kernel is loaded at. For ppc32, there is no any
573 alignment restrictions, and this feature is a superset of
574 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
575 16k-aligned base address. The kernel is linked as a
576 position-independent executable (PIE) and contains dynamic relocations
577 which are processed early in the bootup process.
579 One use is for the kexec on panic case where the recovery kernel
580 must live at a different physical address than the primary
583 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
584 it has been loaded at and the compile time physical addresses
585 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
586 setting can still be useful to bootwrappers that need to know the
587 load address of the kernel (eg. u-boot/mkimage).
589 config RANDOMIZE_BASE
590 bool "Randomize the address of the kernel image"
591 depends on (FSL_BOOKE && FLATMEM && PPC32)
592 depends on RELOCATABLE
594 Randomizes the virtual address at which the kernel image is
595 loaded, as a security feature that deters exploit attempts
596 relying on knowledge of the location of kernel internals.
600 config RELOCATABLE_TEST
601 bool "Test relocatable kernel"
602 depends on (PPC64 && RELOCATABLE)
604 This runs the relocatable kernel at the address it was initially
605 loaded at, which tends to be non-zero and therefore test the
609 bool "Build a dump capture kernel"
610 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
611 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
613 Build a kernel suitable for use as a dump capture kernel.
614 The same kernel binary can be used as production kernel and dump
618 bool "Firmware-assisted dump"
619 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
623 A robust mechanism to get reliable kernel crash dump with
624 assistance from firmware. This approach does not use kexec,
625 instead firmware assists in booting the capture kernel
626 while preserving memory contents. Firmware-assisted dump
627 is meant to be a kdump replacement offering robustness and
628 speed not possible without system firmware assistance.
630 If unsure, say "y". Only special kernels like petitboot may
631 need to say "N" here.
633 config PRESERVE_FA_DUMP
634 bool "Preserve Firmware-assisted dump"
635 depends on PPC64 && PPC_POWERNV && !FA_DUMP
637 On a kernel with FA_DUMP disabled, this option helps to preserve
638 crash data from a previously crash'ed kernel. Useful when the next
639 memory preserving kernel boot would process this crash data.
640 Petitboot kernel is the typical usecase for this option.
643 bool "Export OPAL memory as /sys/firmware/opal/core"
644 depends on PPC64 && PPC_POWERNV
646 This option uses the MPIPL support in firmware to provide an
647 ELF core of OPAL memory after a crash. The ELF core is exported
648 as /sys/firmware/opal/core file which is helpful in debugging
649 OPAL crashes using GDB.
652 bool "Distribute interrupts on all CPUs by default"
655 This option gives the kernel permission to distribute IRQs across
656 multiple CPUs. Saying N here will route all IRQs to the first
657 CPU. Generally saying Y is safe, although some problems have been
658 reported with SMP Power Macintoshes with this option enabled.
661 bool "NUMA Memory Allocation and Scheduler Support"
662 depends on PPC64 && SMP
663 default y if PPC_PSERIES || PPC_POWERNV
665 Enable NUMA (Non-Uniform Memory Access) support.
667 The kernel will try to allocate memory used by a CPU on the
668 local memory controller of the CPU and add some more
669 NUMA awareness to the kernel.
675 depends on NEED_MULTIPLE_NODES
677 config USE_PERCPU_NUMA_NODE_ID
681 config HAVE_MEMORYLESS_NODES
685 config ARCH_SELECT_MEMORY_MODEL
689 config ARCH_FLATMEM_ENABLE
691 depends on (PPC64 && !NUMA) || PPC32
693 config ARCH_SPARSEMEM_ENABLE
696 select SPARSEMEM_VMEMMAP_ENABLE
698 config ARCH_SPARSEMEM_DEFAULT
700 depends on PPC_BOOK3S_64
702 config SYS_SUPPORTS_HUGETLBFS
705 config ILLEGAL_POINTER_VALUE
707 # This is roughly half way between the top of user space and the bottom
708 # of kernel space, which seems about as good as we can get.
709 default 0x5deadbeef0000000 if PPC64
712 config ARCH_MEMORY_PROBE
714 depends on MEMORY_HOTPLUG
720 Select the kernel logical page size. Increasing the page size
721 will reduce software overhead at each page boundary, allow
722 hardware prefetch mechanisms to be more effective, and allow
723 larger dma transfers increasing IO efficiency and reducing
724 overhead. However the utilization of memory will increase.
725 For example, each cached file will using a multiple of the
726 page size to hold its contents and the difference between the
727 end of file and the end of page is wasted.
729 Some dedicated systems, such as software raid serving with
730 accelerated calculations, have shown significant increases.
732 If you configure a 64 bit kernel for 64k pages but the
733 processor does not support them, then the kernel will simulate
734 them with 4k pages, loading them on demand, but with the
735 reduced software overhead and larger internal fragmentation.
736 For the 32 bit kernel, a large page option will not be offered
737 unless it is supported by the configured processor.
739 If unsure, choose 4K_PAGES.
743 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
747 depends on 44x || PPC_8xx
751 depends on 44x || PPC_BOOK3S_64
752 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
754 config PPC_256K_PAGES
755 bool "256k page size (Requires non-standard binutils settings)"
756 depends on 44x && !PPC_47x
758 Make the page size 256k.
760 The kernel will only be able to run applications that have been
761 compiled with '-zmax-page-size' set to 256K (the default is 64K) using
762 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
763 definition from 0x10000 to 0x40000 in older versions.
767 config PPC_PAGE_SHIFT
769 default 18 if PPC_256K_PAGES
770 default 16 if PPC_64K_PAGES
771 default 14 if PPC_16K_PAGES
775 int "Thread shift" if EXPERT
777 default "15" if PPC_256K_PAGES
778 default "14" if PPC64
779 default "14" if KASAN
782 Used to define the stack size. The default is almost always what you
783 want. Only change this if you know what you are doing.
785 config DATA_SHIFT_BOOL
786 bool "Set custom data alignment"
787 depends on ADVANCED_OPTIONS
788 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC
789 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX)
791 This option allows you to set the kernel data alignment. When
792 RAM is mapped by blocks, the alignment needs to fit the size and
793 number of possible blocks. The default should be OK for most configs.
795 Say N here unless you know what you are doing.
798 int "Data shift" if DATA_SHIFT_BOOL
799 default 24 if STRICT_KERNEL_RWX && PPC64
800 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_BOOK3S_32
801 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_8xx
802 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
803 default 18 if DEBUG_PAGEALLOC && PPC_BOOK3S_32
804 default 23 if STRICT_KERNEL_RWX && PPC_8xx
805 default 23 if DEBUG_PAGEALLOC && PPC_8xx && PIN_TLB_DATA
806 default 19 if DEBUG_PAGEALLOC && PPC_8xx
807 default PPC_PAGE_SHIFT
809 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
810 Smaller is the alignment, greater is the number of necessary DBATs.
812 On 8xx, large pages (512kb or 8M) are used to map kernel linear
813 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
814 in that case. If PIN_TLB is selected, it must be aligned to 8M as
815 8M pages will be pinned.
817 config FORCE_MAX_ZONEORDER
818 int "Maximum zone order"
819 range 8 9 if PPC64 && PPC_64K_PAGES
820 default "9" if PPC64 && PPC_64K_PAGES
821 range 13 13 if PPC64 && !PPC_64K_PAGES
822 default "13" if PPC64 && !PPC_64K_PAGES
823 range 9 64 if PPC32 && PPC_16K_PAGES
824 default "9" if PPC32 && PPC_16K_PAGES
825 range 7 64 if PPC32 && PPC_64K_PAGES
826 default "7" if PPC32 && PPC_64K_PAGES
827 range 5 64 if PPC32 && PPC_256K_PAGES
828 default "5" if PPC32 && PPC_256K_PAGES
832 The kernel memory allocator divides physically contiguous memory
833 blocks into "zones", where each zone is a power of two number of
834 pages. This option selects the largest power of two that the kernel
835 keeps in the memory allocator. If you need to allocate very large
836 blocks of physically contiguous memory, then you may need to
839 This config option is actually maximum order plus one. For example,
840 a value of 11 means that the largest free memory block is 2^10 pages.
842 The page size is not necessarily 4KB. For example, on 64-bit
843 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
844 this in mind when choosing a value for this option.
846 config PPC_SUBPAGE_PROT
847 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
849 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
851 This option adds support for system call to allow user programs
852 to set access permissions (read/write, readonly, or no access)
853 on the 4k subpages of each 64k page.
855 If unsure, say N here.
857 config PPC_PROT_SAO_LPAR
858 bool "Support PROT_SAO mappings in LPARs"
859 depends on PPC_BOOK3S_64
861 This option adds support for PROT_SAO mappings from userspace
862 inside LPARs on supported CPUs.
864 This may cause issues when performing guest migration from
865 a CPU that supports SAO to one that does not.
867 If unsure, say N here.
869 config PPC_COPRO_BASE
873 bool "SMT (Hyperthreading) scheduler support"
874 depends on PPC64 && SMP
876 SMT scheduler support improves the CPU scheduler's decision making
877 when dealing with POWER5 cpus at a cost of slightly increased
878 overhead in some places. If unsure say N here.
880 config PPC_DENORMALISATION
881 bool "PowerPC denormalisation exception handling"
882 depends on PPC_BOOK3S_64
883 default "y" if PPC_POWERNV
885 Add support for handling denormalisation of single precision
886 values. Useful for bare metal only. If unsure say Y here.
889 string "Initial kernel command string"
892 On some platforms, there is currently no way for the boot loader to
893 pass arguments to the kernel. For these platforms, you can supply
894 some command-line options at build time by entering them here. In
895 most cases you will need to specify the root device here.
898 prompt "Kernel command line type" if CMDLINE != ""
899 default CMDLINE_FROM_BOOTLOADER
901 config CMDLINE_FROM_BOOTLOADER
902 bool "Use bootloader kernel arguments if available"
904 Uses the command-line options passed by the boot loader. If
905 the boot loader doesn't provide any, the default kernel command
906 string provided in CMDLINE will be used.
908 config CMDLINE_EXTEND
909 bool "Extend bootloader kernel arguments"
911 The command-line arguments provided by the boot loader will be
912 appended to the default kernel command string.
915 bool "Always use the default kernel command string"
917 Always use the default kernel command string, even if the boot
918 loader passes other arguments to the kernel.
919 This is useful if you cannot or don't want to change the
920 command-line options your boot loader passes to the kernel.
925 string "Additional default image types"
927 List additional targets to be built by the bootwrapper here (separated
928 by spaces). This is useful for targets that depend of device tree
929 files in the .dts directory.
931 Targets in this list will be build as part of the default build
932 target, or when the user does a 'make zImage' or a
933 'make zImage.initrd'.
935 If unsure, leave blank
937 config ARCH_WANTS_FREEZER_CONTROL
941 source "kernel/power/Kconfig"
944 prompt "PowerPC Memory Protection Keys"
946 depends on PPC_BOOK3S_64
947 select ARCH_USES_HIGH_VMA_FLAGS
948 select ARCH_HAS_PKEYS
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.
954 For details, see Documentation/core-api/protection-keys.rst
958 config PPC_SECURE_BOOT
959 prompt "Enable secure boot support"
961 depends on PPC_POWERNV || PPC_PSERIES
962 depends on IMA_ARCH_POLICY
963 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
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.
970 config PPC_SECVAR_SYSFS
971 bool "Enable sysfs interface for POWER secure variables"
973 depends on PPC_SECURE_BOOT
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.
981 config PPC_RTAS_FILTER
982 bool "Enable filtering of RTAS syscalls"
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
991 Say Y unless you know what you are doing and the filter is causing
1003 bool "Support for ISA-bus hardware"
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.
1013 config GENERIC_ISA_DMA
1015 depends on ISA_DMA_API
1018 config PPC_INDIRECT_PCI
1021 default y if 40x || 44x
1031 select ARCH_HAS_DMA_SET_MASK
1032 select PPC_INDIRECT_PCI
1038 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1040 Freescale MPC85xx/MPC86xx power management controller support
1041 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1046 depends on SUSPEND && (44x || 40x)
1048 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1049 It also enables support for two different idle states (idle-wait
1056 bool "Freescale Local Bus support"
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.
1064 depends on PPC_83xx || QUICC_ENGINE || CPM2
1066 Freescale General-purpose Timers support
1070 depends on PCI && 8260
1071 select PPC_INDIRECT_PCI
1075 bool "Freescale Embedded SRIO Controller support"
1076 depends on RAPIDIO = y && HAVE_RAPIDIO
1079 Include support for RapidIO controller on Freescale embedded
1080 processors (MPC8548, MPC8641, etc).
1084 config NONSTATIC_KERNEL
1087 menu "Advanced setup"
1090 config ADVANCED_OPTIONS
1091 bool "Prompt for advanced kernel configuration options"
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.
1098 Unless you know what you are doing, say N here.
1100 comment "Default settings for advanced configuration options are used"
1101 depends on !ADVANCED_OPTIONS
1103 config LOWMEM_SIZE_BOOL
1104 bool "Set maximum low memory"
1105 depends on ADVANCED_OPTIONS
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
1113 Say N here unless you know what you are doing.
1116 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1117 default "0x30000000"
1119 config LOWMEM_CAM_NUM_BOOL
1120 bool "Set number of CAMs to use to map low memory"
1121 depends on ADVANCED_OPTIONS && FSL_BOOKE
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.
1129 Say N here unless you know what you are doing.
1131 config LOWMEM_CAM_NUM
1132 depends on FSL_BOOKE
1133 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1136 config DYNAMIC_MEMSTART
1137 bool "Enable page aligned dynamic load address for kernel"
1138 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1139 select NONSTATIC_KERNEL
1141 This option enables the kernel to be loaded at any page aligned
1142 physical address. The kernel creates a mapping from KERNELBASE to
1143 the address where the kernel is loaded. The page size here implies
1144 the TLB page size of the mapping for kernel on the particular platform.
1145 Please refer to the init code for finding the TLB page size.
1147 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1148 kernel image, where the only restriction is the page aligned kernel
1149 load address. When this option is enabled, the compile time physical
1150 address CONFIG_PHYSICAL_START is ignored.
1152 This option is overridden by CONFIG_RELOCATABLE
1154 config PAGE_OFFSET_BOOL
1155 bool "Set custom page offset address"
1156 depends on ADVANCED_OPTIONS
1158 This option allows you to set the kernel virtual address at which
1159 the kernel will map low memory. This can be useful in optimizing
1160 the virtual memory layout of the system.
1162 Say N here unless you know what you are doing.
1165 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1166 default "0xc0000000"
1168 config KERNEL_START_BOOL
1169 bool "Set custom kernel base address"
1170 depends on ADVANCED_OPTIONS
1172 This option allows you to set the kernel virtual address at which
1173 the kernel will be loaded. Normally this should match PAGE_OFFSET
1174 however there are times (like kdump) that one might not want them
1177 Say N here unless you know what you are doing.
1180 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1181 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1182 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1183 default "0xc0000000"
1185 config PHYSICAL_START_BOOL
1186 bool "Set physical address where the kernel is loaded"
1187 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1189 This gives the physical address where the kernel is loaded.
1191 Say N here unless you know what you are doing.
1193 config PHYSICAL_START
1194 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1195 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1196 default "0x00000000"
1198 config PHYSICAL_ALIGN
1200 default "0x04000000" if FSL_BOOKE
1202 This value puts the alignment restrictions on physical address
1203 where kernel is loaded and run from. Kernel is compiled for an
1204 address which meets above alignment restriction.
1206 config TASK_SIZE_BOOL
1207 bool "Set custom user task size"
1208 depends on ADVANCED_OPTIONS
1210 This option allows you to set the amount of virtual address space
1211 allocated to user tasks. This can be useful in optimizing the
1212 virtual memory layout of the system.
1214 Say N here unless you know what you are doing.
1217 hex "Size of user task space" if TASK_SIZE_BOOL
1218 default "0x80000000" if PPC_8xx
1219 default "0xb0000000" if PPC_BOOK3S_32 && STRICT_KERNEL_RWX
1220 default "0xc0000000"
1224 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1227 default "0xc000000000000000"
1230 default "0xc000000000000000"
1231 config PHYSICAL_START
1233 default "0x00000000"
1239 config PPC_LIB_RHEAP
1242 source "arch/powerpc/kvm/Kconfig"
1244 source "kernel/livepatch/Kconfig"