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 seleted 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 DYNAMIC_FTRACE if FUNCTION_TRACER
165 select EDAC_ATOMIC_SCRUB
167 select GENERIC_ATOMIC64 if PPC32
168 select GENERIC_CLOCKEVENTS
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 HAVE_ARCH_AUDITSYSCALL
182 select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
183 select HAVE_ARCH_JUMP_LABEL
184 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
185 select HAVE_ARCH_KASAN_VMALLOC if PPC32 && PPC_PAGE_SHIFT <= 14
186 select HAVE_ARCH_KGDB
187 select HAVE_ARCH_MMAP_RND_BITS
188 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
189 select HAVE_ARCH_NVRAM_OPS
190 select HAVE_ARCH_SECCOMP_FILTER
191 select HAVE_ARCH_TRACEHOOK
192 select HAVE_ASM_MODVERSIONS
193 select HAVE_C_RECORDMCOUNT
194 select HAVE_CBPF_JIT if !PPC64
195 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
196 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
197 select HAVE_CONTEXT_TRACKING if PPC64
198 select HAVE_TIF_NOHZ 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_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
213 select HAVE_IOREMAP_PROT
214 select HAVE_IRQ_EXIT_ON_IRQ_STACK
215 select HAVE_KERNEL_GZIP
216 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
217 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
218 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
220 select HAVE_KPROBES_ON_FTRACE
221 select HAVE_KRETPROBES
222 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
223 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
224 select HAVE_MOD_ARCH_SPECIFIC
225 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
226 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 COMPAT_BINFMT_ELF
284 select ARCH_WANT_OLD_COMPAT_IPC
285 select COMPAT_OLD_SIGACTION
287 config SYSVIPC_COMPAT
289 depends on COMPAT && SYSVIPC
292 config SCHED_OMIT_FRAME_POINTER
296 config ARCH_MAY_HAVE_PC_FDC
300 config PPC_UDBG_16550
303 config GENERIC_TBSYNC
305 default y if PPC32 && SMP
316 config SYS_SUPPORTS_APM_EMULATION
317 default y if PMAC_APM_EMU
323 Used to allow a board to specify it wants an ePAPR compliant wrapper.
325 config DEFAULT_UIMAGE
328 Used to allow a board to specify it wants a uImage built by default
330 config ARCH_HIBERNATION_POSSIBLE
334 config ARCH_SUSPEND_POSSIBLE
336 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
337 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
340 config ARCH_SUSPEND_NONZERO_CPU
342 depends on PPC_POWERNV || PPC_PSERIES
344 config PPC_DCR_NATIVE
352 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
355 config PPC_OF_PLATFORM_PCI
358 depends on PPC64 # not supported on 32 bits yet
360 config ARCH_SUPPORTS_UPROBES
363 config PPC_ADV_DEBUG_REGS
365 depends on 40x || BOOKE
368 config PPC_ADV_DEBUG_IACS
370 depends on PPC_ADV_DEBUG_REGS
374 config PPC_ADV_DEBUG_DACS
376 depends on PPC_ADV_DEBUG_REGS
379 config PPC_ADV_DEBUG_DVCS
381 depends on PPC_ADV_DEBUG_REGS
385 config PPC_ADV_DEBUG_DAC_RANGE
387 depends on PPC_ADV_DEBUG_REGS && 44x
395 default y if PPC_BOOK3E_64
397 config PGTABLE_LEVELS
402 source "arch/powerpc/sysdev/Kconfig"
403 source "arch/powerpc/platforms/Kconfig"
405 menu "Kernel options"
408 bool "High memory support"
412 source "kernel/Kconfig.hz"
414 config HUGETLB_PAGE_SIZE_VARIABLE
416 depends on HUGETLB_PAGE && PPC_BOOK3S_64
419 config MATH_EMULATION
420 bool "Math emulation"
421 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
423 Some PowerPC chips designed for embedded applications do not have
424 a floating-point unit and therefore do not implement the
425 floating-point instructions in the PowerPC instruction set. If you
426 say Y here, the kernel will include code to emulate a floating-point
427 unit, which will allow programs that use floating-point
430 This is also useful to emulate missing (optional) instructions
431 such as fsqrt on cores that do have an FPU but do not implement
432 them (such as Freescale BookE).
435 prompt "Math emulation options"
436 default MATH_EMULATION_FULL
437 depends on MATH_EMULATION
439 config MATH_EMULATION_FULL
440 bool "Emulate all the floating point instructions"
442 Select this option will enable the kernel to support to emulate
443 all the floating point instructions. If your SoC doesn't have
444 a FPU, you should select this.
446 config MATH_EMULATION_HW_UNIMPLEMENTED
447 bool "Just emulate the FPU unimplemented instructions"
449 Select this if you know there does have a hardware FPU on your
450 SoC, but some floating point instructions are not implemented by that.
454 config PPC_TRANSACTIONAL_MEM
455 bool "Transactional Memory support for POWERPC"
456 depends on PPC_BOOK3S_64
461 Support user-mode Transactional Memory on POWERPC.
464 bool "Ultravisor support"
465 depends on KVM_BOOK3S_HV_POSSIBLE
466 depends on DEVICE_PRIVATE
469 This option paravirtualizes the kernel to run in POWER platforms that
470 supports the Protected Execution Facility (PEF). On such platforms,
471 the ultravisor firmware runs at a privilege level above the
476 config LD_HEAD_STUB_CATCH
477 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
480 Very large kernels can cause linker branch stubs to be generated by
481 code in head_64.S, which moves the head text sections out of their
482 specified location. This option can work around the problem.
486 config MPROFILE_KERNEL
487 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
488 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
491 bool "Support for enabling/disabling CPUs"
492 depends on SMP && (PPC_PSERIES || \
493 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
495 Say Y here to be able to disable and re-enable individual
496 CPUs at runtime on SMP machines.
498 Say N if you are unsure.
500 config PPC_QUEUED_SPINLOCKS
501 bool "Queued spinlocks"
504 Say Y here to use queued spinlocks which give better scalability and
505 fairness on large SMP and NUMA systems without harming single threaded
508 This option is currently experimental, the code is more complex and
509 less tested so it defaults to "N" for the moment.
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.
663 default y if SMP && PPC_PSERIES
669 depends on NEED_MULTIPLE_NODES
671 config USE_PERCPU_NUMA_NODE_ID
675 config HAVE_MEMORYLESS_NODES
679 config ARCH_SELECT_MEMORY_MODEL
683 config ARCH_FLATMEM_ENABLE
685 depends on (PPC64 && !NUMA) || PPC32
687 config ARCH_SPARSEMEM_ENABLE
690 select SPARSEMEM_VMEMMAP_ENABLE
692 config ARCH_SPARSEMEM_DEFAULT
694 depends on PPC_BOOK3S_64
696 config SYS_SUPPORTS_HUGETLBFS
699 config ILLEGAL_POINTER_VALUE
701 # This is roughly half way between the top of user space and the bottom
702 # of kernel space, which seems about as good as we can get.
703 default 0x5deadbeef0000000 if PPC64
706 config ARCH_MEMORY_PROBE
708 depends on MEMORY_HOTPLUG
711 bool "Using standard binutils settings"
715 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
716 Note, that kernel will be able to run only those applications,
717 which had been compiled using binutils later than 2.17.50.0.3 with
718 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
719 the older binutils, you can patch them with a trivial patch, which
720 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
726 Select the kernel logical page size. Increasing the page size
727 will reduce software overhead at each page boundary, allow
728 hardware prefetch mechanisms to be more effective, and allow
729 larger dma transfers increasing IO efficiency and reducing
730 overhead. However the utilization of memory will increase.
731 For example, each cached file will using a multiple of the
732 page size to hold its contents and the difference between the
733 end of file and the end of page is wasted.
735 Some dedicated systems, such as software raid serving with
736 accelerated calculations, have shown significant increases.
738 If you configure a 64 bit kernel for 64k pages but the
739 processor does not support them, then the kernel will simulate
740 them with 4k pages, loading them on demand, but with the
741 reduced software overhead and larger internal fragmentation.
742 For the 32 bit kernel, a large page option will not be offered
743 unless it is supported by the configured processor.
745 If unsure, choose 4K_PAGES.
749 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
753 depends on 44x || PPC_8xx
757 depends on 44x || PPC_BOOK3S_64
758 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
760 config PPC_256K_PAGES
761 bool "256k page size"
762 depends on 44x && !STDBINUTILS
764 Make the page size 256k.
766 As the ELF standard only requires alignment to support page
767 sizes up to 64k, you will need to compile all of your user
768 space applications with a non-standard binutils settings
769 (see the STDBINUTILS description for details).
771 Say N unless you know what you are doing.
775 config PPC_PAGE_SHIFT
777 default 18 if PPC_256K_PAGES
778 default 16 if PPC_64K_PAGES
779 default 14 if PPC_16K_PAGES
783 int "Thread shift" if EXPERT
785 default "15" if PPC_256K_PAGES
786 default "14" if PPC64
787 default "14" if KASAN
790 Used to define the stack size. The default is almost always what you
791 want. Only change this if you know what you are doing.
793 config DATA_SHIFT_BOOL
794 bool "Set custom data alignment"
795 depends on ADVANCED_OPTIONS
796 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC
797 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && \
798 (!PIN_TLB_TEXT || !STRICT_KERNEL_RWX))
800 This option allows you to set the kernel data alignment. When
801 RAM is mapped by blocks, the alignment needs to fit the size and
802 number of possible blocks. The default should be OK for most configs.
804 Say N here unless you know what you are doing.
807 int "Data shift" if DATA_SHIFT_BOOL
808 default 24 if STRICT_KERNEL_RWX && PPC64
809 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_BOOK3S_32
810 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_8xx
811 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
812 default 18 if DEBUG_PAGEALLOC && PPC_BOOK3S_32
813 default 23 if STRICT_KERNEL_RWX && PPC_8xx
814 default 23 if DEBUG_PAGEALLOC && PPC_8xx && PIN_TLB_DATA
815 default 19 if DEBUG_PAGEALLOC && PPC_8xx
816 default PPC_PAGE_SHIFT
818 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
819 Smaller is the alignment, greater is the number of necessary DBATs.
821 On 8xx, large pages (512kb or 8M) are used to map kernel linear
822 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
823 in that case. If PIN_TLB is selected, it must be aligned to 8M as
824 8M pages will be pinned.
826 config FORCE_MAX_ZONEORDER
827 int "Maximum zone order"
828 range 8 9 if PPC64 && PPC_64K_PAGES
829 default "9" if PPC64 && PPC_64K_PAGES
830 range 13 13 if PPC64 && !PPC_64K_PAGES
831 default "13" if PPC64 && !PPC_64K_PAGES
832 range 9 64 if PPC32 && PPC_16K_PAGES
833 default "9" if PPC32 && PPC_16K_PAGES
834 range 7 64 if PPC32 && PPC_64K_PAGES
835 default "7" if PPC32 && PPC_64K_PAGES
836 range 5 64 if PPC32 && PPC_256K_PAGES
837 default "5" if PPC32 && PPC_256K_PAGES
841 The kernel memory allocator divides physically contiguous memory
842 blocks into "zones", where each zone is a power of two number of
843 pages. This option selects the largest power of two that the kernel
844 keeps in the memory allocator. If you need to allocate very large
845 blocks of physically contiguous memory, then you may need to
848 This config option is actually maximum order plus one. For example,
849 a value of 11 means that the largest free memory block is 2^10 pages.
851 The page size is not necessarily 4KB. For example, on 64-bit
852 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
853 this in mind when choosing a value for this option.
855 config PPC_SUBPAGE_PROT
856 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
858 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
860 This option adds support for system call to allow user programs
861 to set access permissions (read/write, readonly, or no access)
862 on the 4k subpages of each 64k page.
864 If unsure, say N here.
866 config PPC_PROT_SAO_LPAR
867 bool "Support PROT_SAO mappings in LPARs"
868 depends on PPC_BOOK3S_64
870 This option adds support for PROT_SAO mappings from userspace
871 inside LPARs on supported CPUs.
873 This may cause issues when performing guest migration from
874 a CPU that supports SAO to one that does not.
876 If unsure, say N here.
878 config PPC_COPRO_BASE
882 bool "SMT (Hyperthreading) scheduler support"
883 depends on PPC64 && SMP
885 SMT scheduler support improves the CPU scheduler's decision making
886 when dealing with POWER5 cpus at a cost of slightly increased
887 overhead in some places. If unsure say N here.
889 config PPC_DENORMALISATION
890 bool "PowerPC denormalisation exception handling"
891 depends on PPC_BOOK3S_64
892 default "y" if PPC_POWERNV
894 Add support for handling denormalisation of single precision
895 values. Useful for bare metal only. If unsure say Y here.
898 string "Initial kernel command string"
901 On some platforms, there is currently no way for the boot loader to
902 pass arguments to the kernel. For these platforms, you can supply
903 some command-line options at build time by entering them here. In
904 most cases you will need to specify the root device here.
907 prompt "Kernel command line type" if CMDLINE != ""
908 default CMDLINE_FROM_BOOTLOADER
910 config CMDLINE_FROM_BOOTLOADER
911 bool "Use bootloader kernel arguments if available"
913 Uses the command-line options passed by the boot loader. If
914 the boot loader doesn't provide any, the default kernel command
915 string provided in CMDLINE will be used.
917 config CMDLINE_EXTEND
918 bool "Extend bootloader kernel arguments"
920 The command-line arguments provided by the boot loader will be
921 appended to the default kernel command string.
924 bool "Always use the default kernel command string"
926 Always use the default kernel command string, even if the boot
927 loader passes other arguments to the kernel.
928 This is useful if you cannot or don't want to change the
929 command-line options your boot loader passes to the kernel.
934 string "Additional default image types"
936 List additional targets to be built by the bootwrapper here (separated
937 by spaces). This is useful for targets that depend of device tree
938 files in the .dts directory.
940 Targets in this list will be build as part of the default build
941 target, or when the user does a 'make zImage' or a
942 'make zImage.initrd'.
944 If unsure, leave blank
946 config ARCH_WANTS_FREEZER_CONTROL
950 source "kernel/power/Kconfig"
953 prompt "PowerPC Memory Protection Keys"
955 depends on PPC_BOOK3S_64
956 select ARCH_USES_HIGH_VMA_FLAGS
957 select ARCH_HAS_PKEYS
959 Memory Protection Keys provides a mechanism for enforcing
960 page-based protections, but without requiring modification of the
961 page tables when an application changes protection domains.
963 For details, see Documentation/core-api/protection-keys.rst
967 config PPC_SECURE_BOOT
968 prompt "Enable secure boot support"
970 depends on PPC_POWERNV || PPC_PSERIES
971 depends on IMA_ARCH_POLICY
972 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
974 Systems with firmware secure boot enabled need to define security
975 policies to extend secure boot to the OS. This config allows a user
976 to enable OS secure boot on systems that have firmware support for
977 it. If in doubt say N.
979 config PPC_SECVAR_SYSFS
980 bool "Enable sysfs interface for POWER secure variables"
982 depends on PPC_SECURE_BOOT
985 POWER secure variables are managed and controlled by firmware.
986 These variables are exposed to userspace via sysfs to enable
987 read/write operations on these variables. Say Y if you have
988 secure boot enabled and want to expose variables to userspace.
990 config PPC_RTAS_FILTER
991 bool "Enable filtering of RTAS syscalls"
995 The RTAS syscall API has security issues that could be used to
996 compromise system integrity. This option enforces restrictions on the
997 RTAS calls and arguments passed by userspace programs to mitigate
1000 Say Y unless you know what you are doing and the filter is causing
1012 bool "Support for ISA-bus hardware"
1016 Find out whether you have ISA slots on your motherboard. ISA is the
1017 name of a bus system, i.e. the way the CPU talks to the other stuff
1018 inside your box. If you have an Apple machine, say N here; if you
1019 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1020 embedded board, consult your board documentation.
1022 config GENERIC_ISA_DMA
1024 depends on ISA_DMA_API
1027 config PPC_INDIRECT_PCI
1030 default y if 40x || 44x
1040 select ARCH_HAS_DMA_SET_MASK
1041 select PPC_INDIRECT_PCI
1047 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1049 Freescale MPC85xx/MPC86xx power management controller support
1050 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1055 depends on SUSPEND && (44x || 40x)
1057 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1058 It also enables support for two different idle states (idle-wait
1065 bool "Freescale Local Bus support"
1067 Enables reporting of errors from the Freescale local bus
1068 controller. Also contains some common code used by
1069 drivers for specific local bus peripherals.
1073 depends on PPC_83xx || QUICC_ENGINE || CPM2
1075 Freescale General-purpose Timers support
1079 depends on PCI && 8260
1080 select PPC_INDIRECT_PCI
1084 bool "Freescale Embedded SRIO Controller support"
1085 depends on RAPIDIO = y && HAVE_RAPIDIO
1088 Include support for RapidIO controller on Freescale embedded
1089 processors (MPC8548, MPC8641, etc).
1093 config NONSTATIC_KERNEL
1096 menu "Advanced setup"
1099 config ADVANCED_OPTIONS
1100 bool "Prompt for advanced kernel configuration options"
1102 This option will enable prompting for a variety of advanced kernel
1103 configuration options. These options can cause the kernel to not
1104 work if they are set incorrectly, but can be used to optimize certain
1105 aspects of kernel memory management.
1107 Unless you know what you are doing, say N here.
1109 comment "Default settings for advanced configuration options are used"
1110 depends on !ADVANCED_OPTIONS
1112 config LOWMEM_SIZE_BOOL
1113 bool "Set maximum low memory"
1114 depends on ADVANCED_OPTIONS
1116 This option allows you to set the maximum amount of memory which
1117 will be used as "low memory", that is, memory which the kernel can
1118 access directly, without having to set up a kernel virtual mapping.
1119 This can be useful in optimizing the layout of kernel virtual
1122 Say N here unless you know what you are doing.
1125 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1126 default "0x30000000"
1128 config LOWMEM_CAM_NUM_BOOL
1129 bool "Set number of CAMs to use to map low memory"
1130 depends on ADVANCED_OPTIONS && FSL_BOOKE
1132 This option allows you to set the maximum number of CAM slots that
1133 will be used to map low memory. There are a limited number of slots
1134 available and even more limited number that will fit in the L1 MMU.
1135 However, using more entries will allow mapping more low memory. This
1136 can be useful in optimizing the layout of kernel virtual memory.
1138 Say N here unless you know what you are doing.
1140 config LOWMEM_CAM_NUM
1141 depends on FSL_BOOKE
1142 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1145 config DYNAMIC_MEMSTART
1146 bool "Enable page aligned dynamic load address for kernel"
1147 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1148 select NONSTATIC_KERNEL
1150 This option enables the kernel to be loaded at any page aligned
1151 physical address. The kernel creates a mapping from KERNELBASE to
1152 the address where the kernel is loaded. The page size here implies
1153 the TLB page size of the mapping for kernel on the particular platform.
1154 Please refer to the init code for finding the TLB page size.
1156 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1157 kernel image, where the only restriction is the page aligned kernel
1158 load address. When this option is enabled, the compile time physical
1159 address CONFIG_PHYSICAL_START is ignored.
1161 This option is overridden by CONFIG_RELOCATABLE
1163 config PAGE_OFFSET_BOOL
1164 bool "Set custom page offset address"
1165 depends on ADVANCED_OPTIONS
1167 This option allows you to set the kernel virtual address at which
1168 the kernel will map low memory. This can be useful in optimizing
1169 the virtual memory layout of the system.
1171 Say N here unless you know what you are doing.
1174 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1175 default "0xc0000000"
1177 config KERNEL_START_BOOL
1178 bool "Set custom kernel base address"
1179 depends on ADVANCED_OPTIONS
1181 This option allows you to set the kernel virtual address at which
1182 the kernel will be loaded. Normally this should match PAGE_OFFSET
1183 however there are times (like kdump) that one might not want them
1186 Say N here unless you know what you are doing.
1189 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1190 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1191 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1192 default "0xc0000000"
1194 config PHYSICAL_START_BOOL
1195 bool "Set physical address where the kernel is loaded"
1196 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1198 This gives the physical address where the kernel is loaded.
1200 Say N here unless you know what you are doing.
1202 config PHYSICAL_START
1203 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1204 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1205 default "0x00000000"
1207 config PHYSICAL_ALIGN
1209 default "0x04000000" if FSL_BOOKE
1211 This value puts the alignment restrictions on physical address
1212 where kernel is loaded and run from. Kernel is compiled for an
1213 address which meets above alignment restriction.
1215 config TASK_SIZE_BOOL
1216 bool "Set custom user task size"
1217 depends on ADVANCED_OPTIONS
1219 This option allows you to set the amount of virtual address space
1220 allocated to user tasks. This can be useful in optimizing the
1221 virtual memory layout of the system.
1223 Say N here unless you know what you are doing.
1226 hex "Size of user task space" if TASK_SIZE_BOOL
1227 default "0x80000000" if PPC_8xx
1228 default "0xb0000000" if PPC_BOOK3S_32 && STRICT_KERNEL_RWX
1229 default "0xc0000000"
1233 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1236 default "0xc000000000000000"
1239 default "0xc000000000000000"
1240 config PHYSICAL_START
1242 default "0x00000000"
1248 config PPC_LIB_RHEAP
1251 source "arch/powerpc/kvm/Kconfig"
1253 source "kernel/livepatch/Kconfig"