1 # SPDX-License-Identifier: GPL-2.0
2 source "arch/powerpc/platforms/Kconfig.cputype"
20 config ARCH_MMAP_RND_BITS_MAX
21 # On Book3S 64, the default virtual address space for 64-bit processes
22 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
23 # 32T of address space (2^45), which should ensure a reasonable gap
24 # between bottom-up and top-down allocations for applications that
25 # consume "normal" amounts of address space. Book3S 64 only supports 64K
27 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
28 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K)
30 # On all other 64-bit platforms (currently only Book3E), the virtual
31 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
32 # of address space (2^44). Only 4K page sizes are supported.
33 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K)
35 # For 32-bit, use the compat values, as they're the same.
36 default ARCH_MMAP_RND_COMPAT_BITS_MAX
38 config ARCH_MMAP_RND_BITS_MIN
39 # Allow randomisation to consume up to 1GB of address space (2^30).
40 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K)
41 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K)
43 # For 32-bit, use the compat values, as they're the same.
44 default ARCH_MMAP_RND_COMPAT_BITS_MIN
46 config ARCH_MMAP_RND_COMPAT_BITS_MAX
47 # Total virtual address space for 32-bit processes is 2^31 (2GB).
48 # Allow randomisation to consume up to 512MB of address space (2^29).
49 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K)
50 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K)
51 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K)
52 default 17 # 17 = 29 (512MB) - 12 (4K)
54 config ARCH_MMAP_RND_COMPAT_BITS_MIN
55 # Total virtual address space for 32-bit processes is 2^31 (2GB).
56 # Allow randomisation to consume up to 8MB of address space (2^23).
57 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K)
58 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K)
59 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K)
60 default 11 # 11 = 23 (8MB) - 12 (4K)
62 config HAVE_SETUP_PER_CPU_AREA
65 config NEED_PER_CPU_EMBED_FIRST_CHUNK
69 int "Number of virtual interrupt numbers"
73 This defines the number of virtual interrupt numbers the kernel
74 can manage. Virtual interrupt numbers are what you see in
75 /proc/interrupts. If you configure your system to have too few,
76 drivers will fail to load or worse - handle with care.
80 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
85 depends on HARDLOCKUP_DETECTOR
86 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
89 This is a placeholder when the powerpc hardlockup detector
90 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
91 seleted via the generic lockup detector menu which is why we
92 have no standalone config option for it here.
94 config STACKTRACE_SUPPORT
98 config TRACE_IRQFLAGS_SUPPORT
102 config LOCKDEP_SUPPORT
106 config GENERIC_LOCKBREAK
109 depends on SMP && PREEMPT
111 config GENERIC_HWEIGHT
119 # Please keep this list sorted alphabetically.
121 select ARCH_32BIT_OFF_T if PPC32
122 select ARCH_HAS_DEBUG_VIRTUAL
123 select ARCH_HAS_DEVMEM_IS_ALLOWED
124 select ARCH_HAS_ELF_RANDOMIZE
125 select ARCH_HAS_FORTIFY_SOURCE
126 select ARCH_HAS_GCOV_PROFILE_ALL
128 select ARCH_HAS_HUGEPD if HUGETLB_PAGE
129 select ARCH_HAS_MMIOWB if PPC64
130 select ARCH_HAS_PHYS_TO_DMA
131 select ARCH_HAS_PMEM_API
132 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
133 select ARCH_HAS_PTE_SPECIAL
134 select ARCH_HAS_MEMBARRIER_CALLBACKS
135 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
136 select ARCH_HAS_STRICT_KERNEL_RWX if (PPC32 && !HIBERNATION)
137 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
138 select ARCH_HAS_UACCESS_FLUSHCACHE
139 select ARCH_HAS_UACCESS_MCSAFE if PPC64
140 select ARCH_HAS_UBSAN_SANITIZE_ALL
141 select ARCH_HAVE_NMI_SAFE_CMPXCHG
142 select ARCH_KEEP_MEMBLOCK
143 select ARCH_MIGHT_HAVE_PC_PARPORT
144 select ARCH_MIGHT_HAVE_PC_SERIO
145 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
146 select ARCH_SUPPORTS_ATOMIC_RMW
147 select ARCH_USE_BUILTIN_BSWAP
148 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
149 select ARCH_WANT_IPC_PARSE_VERSION
150 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
151 select ARCH_WEAK_RELEASE_ACQUIRE
153 select BUILDTIME_EXTABLE_SORT
154 select CLONE_BACKWARDS
155 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
156 select DYNAMIC_FTRACE if FUNCTION_TRACER
157 select EDAC_ATOMIC_SCRUB
159 select GENERIC_ATOMIC64 if PPC32
160 select GENERIC_CLOCKEVENTS
161 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
162 select GENERIC_CMOS_UPDATE
163 select GENERIC_CPU_AUTOPROBE
164 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
165 select GENERIC_IRQ_SHOW
166 select GENERIC_IRQ_SHOW_LEVEL
167 select GENERIC_PCI_IOMAP if PCI
168 select GENERIC_SMP_IDLE_THREAD
169 select GENERIC_STRNCPY_FROM_USER
170 select GENERIC_STRNLEN_USER
171 select GENERIC_TIME_VSYSCALL
172 select HAVE_ARCH_AUDITSYSCALL
173 select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
174 select HAVE_ARCH_JUMP_LABEL
175 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
176 select HAVE_ARCH_KGDB
177 select HAVE_ARCH_MMAP_RND_BITS
178 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
179 select HAVE_ARCH_NVRAM_OPS
180 select HAVE_ARCH_SECCOMP_FILTER
181 select HAVE_ARCH_TRACEHOOK
182 select HAVE_ASM_MODVERSIONS
183 select HAVE_C_RECORDMCOUNT
184 select HAVE_CBPF_JIT if !PPC64
185 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
186 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
187 select HAVE_CONTEXT_TRACKING if PPC64
188 select HAVE_COPY_THREAD_TLS
189 select HAVE_DEBUG_KMEMLEAK
190 select HAVE_DEBUG_STACKOVERFLOW
191 select HAVE_DYNAMIC_FTRACE
192 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
193 select HAVE_EBPF_JIT if PPC64
194 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
196 select HAVE_FTRACE_MCOUNT_RECORD
197 select HAVE_FUNCTION_ERROR_INJECTION
198 select HAVE_FUNCTION_GRAPH_TRACER
199 select HAVE_FUNCTION_TRACER
200 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
201 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
203 select HAVE_IOREMAP_PROT
204 select HAVE_IRQ_EXIT_ON_IRQ_STACK
205 select HAVE_KERNEL_GZIP
206 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
207 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
208 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
210 select HAVE_KPROBES_ON_FTRACE
211 select HAVE_KRETPROBES
212 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
213 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
214 select HAVE_MEMBLOCK_NODE_MAP
215 select HAVE_MOD_ARCH_SPECIFIC
216 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
217 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC64 && PPC_BOOK3S && SMP
219 select HAVE_OPTPROBES if PPC64
220 select HAVE_PERF_EVENTS
221 select HAVE_PERF_EVENTS_NMI if PPC64
222 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
223 select HAVE_PERF_REGS
224 select HAVE_PERF_USER_STACK_DUMP
225 select HAVE_RCU_TABLE_FREE
226 select HAVE_MMU_GATHER_PAGE_SIZE
227 select HAVE_REGS_AND_STACK_ACCESS_API
228 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
229 select HAVE_SYSCALL_TRACEPOINTS
230 select HAVE_VIRT_CPU_ACCOUNTING
231 select HAVE_IRQ_TIME_ACCOUNTING
233 select IOMMU_HELPER if PPC64
235 select IRQ_FORCED_THREADING
236 select MODULES_USE_ELF_RELA
237 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
238 select NEED_SG_DMA_LENGTH
240 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
241 select OF_EARLY_FLATTREE
242 select OLD_SIGACTION if PPC32
243 select OLD_SIGSUSPEND
244 select PCI_DOMAINS if PCI
245 select PCI_SYSCALL if PCI
246 select PPC_DAWR if PPC64
249 select SYSCTL_EXCEPTION_TRACE
250 select THREAD_INFO_IN_TASK
251 select VIRT_TO_BUS if !PPC64
253 # Please keep this list sorted alphabetically.
256 config PPC_BARRIER_NOSPEC
259 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
272 select COMPAT_BINFMT_ELF
273 select ARCH_WANT_OLD_COMPAT_IPC
274 select COMPAT_OLD_SIGACTION
276 config SYSVIPC_COMPAT
278 depends on COMPAT && SYSVIPC
281 config SCHED_OMIT_FRAME_POINTER
285 config ARCH_MAY_HAVE_PC_FDC
289 config PPC_UDBG_16550
292 config GENERIC_TBSYNC
294 default y if PPC32 && SMP
305 config SYS_SUPPORTS_APM_EMULATION
306 default y if PMAC_APM_EMU
312 Used to allow a board to specify it wants an ePAPR compliant wrapper.
314 config DEFAULT_UIMAGE
317 Used to allow a board to specify it wants a uImage built by default
319 config ARCH_HIBERNATION_POSSIBLE
323 config ARCH_SUSPEND_POSSIBLE
325 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
326 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
329 config ARCH_SUSPEND_NONZERO_CPU
331 depends on PPC_POWERNV || PPC_PSERIES
333 config PPC_DCR_NATIVE
341 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
344 config PPC_OF_PLATFORM_PCI
347 depends on PPC64 # not supported on 32 bits yet
349 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
350 depends on PPC32 || PPC_BOOK3S_64
353 config ARCH_SUPPORTS_UPROBES
356 config PPC_ADV_DEBUG_REGS
358 depends on 40x || BOOKE
361 config PPC_ADV_DEBUG_IACS
363 depends on PPC_ADV_DEBUG_REGS
367 config PPC_ADV_DEBUG_DACS
369 depends on PPC_ADV_DEBUG_REGS
372 config PPC_ADV_DEBUG_DVCS
374 depends on PPC_ADV_DEBUG_REGS
378 config PPC_ADV_DEBUG_DAC_RANGE
380 depends on PPC_ADV_DEBUG_REGS && 44x
388 default y if PPC_BOOK3E_64
390 config PGTABLE_LEVELS
395 source "arch/powerpc/sysdev/Kconfig"
396 source "arch/powerpc/platforms/Kconfig"
398 menu "Kernel options"
401 bool "High memory support"
404 source "kernel/Kconfig.hz"
406 config HUGETLB_PAGE_SIZE_VARIABLE
408 depends on HUGETLB_PAGE && PPC_BOOK3S_64
411 config MATH_EMULATION
412 bool "Math emulation"
413 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
415 Some PowerPC chips designed for embedded applications do not have
416 a floating-point unit and therefore do not implement the
417 floating-point instructions in the PowerPC instruction set. If you
418 say Y here, the kernel will include code to emulate a floating-point
419 unit, which will allow programs that use floating-point
422 This is also useful to emulate missing (optional) instructions
423 such as fsqrt on cores that do have an FPU but do not implement
424 them (such as Freescale BookE).
427 prompt "Math emulation options"
428 default MATH_EMULATION_FULL
429 depends on MATH_EMULATION
431 config MATH_EMULATION_FULL
432 bool "Emulate all the floating point instructions"
434 Select this option will enable the kernel to support to emulate
435 all the floating point instructions. If your SoC doesn't have
436 a FPU, you should select this.
438 config MATH_EMULATION_HW_UNIMPLEMENTED
439 bool "Just emulate the FPU unimplemented instructions"
441 Select this if you know there does have a hardware FPU on your
442 SoC, but some floating point instructions are not implemented by that.
446 config PPC_TRANSACTIONAL_MEM
447 bool "Transactional Memory support for POWERPC"
448 depends on PPC_BOOK3S_64
453 Support user-mode Transactional Memory on POWERPC.
455 config LD_HEAD_STUB_CATCH
456 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
459 Very large kernels can cause linker branch stubs to be generated by
460 code in head_64.S, which moves the head text sections out of their
461 specified location. This option can work around the problem.
465 config MPROFILE_KERNEL
466 depends on PPC64 && CPU_LITTLE_ENDIAN
467 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
470 bool "Support for enabling/disabling CPUs"
471 depends on SMP && (PPC_PSERIES || \
472 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
474 Say Y here to be able to disable and re-enable individual
475 CPUs at runtime on SMP machines.
477 Say N if you are unsure.
479 config ARCH_CPU_PROBE_RELEASE
481 depends on HOTPLUG_CPU
483 config ARCH_ENABLE_MEMORY_HOTPLUG
486 config ARCH_ENABLE_MEMORY_HOTREMOVE
489 config PPC64_SUPPORTS_MEMORY_FAILURE
490 bool "Add support for memory hwpoison"
491 depends on PPC_BOOK3S_64
492 default "y" if PPC_POWERNV
493 select ARCH_SUPPORTS_MEMORY_FAILURE
496 bool "kexec system call"
497 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
500 kexec is a system call that implements the ability to shutdown your
501 current kernel, and to start another kernel. It is like a reboot
502 but it is independent of the system firmware. And like a reboot
503 you can start any kernel with it, not just Linux.
505 The name comes from the similarity to the exec system call.
507 It is an ongoing process to be certain the hardware in a machine
508 is properly shutdown, so do not be surprised if this code does not
509 initially work for you. As of this writing the exact hardware
510 interface is strongly in flux, so no good recommendation can be
514 bool "kexec file based system call"
516 select HAVE_IMA_KEXEC
521 depends on CRYPTO_SHA256=y
523 This is a new version of the kexec system call. This call is
524 file based and takes in file descriptors as system call arguments
525 for kernel and initramfs as opposed to a list of segments as is the
526 case for the older kexec call.
528 config ARCH_HAS_KEXEC_PURGATORY
532 bool "Build a relocatable kernel"
533 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
534 select NONSTATIC_KERNEL
535 select MODULE_REL_CRCS if MODVERSIONS
537 This builds a kernel image that is capable of running at the
538 location the kernel is loaded at. For ppc32, there is no any
539 alignment restrictions, and this feature is a superset of
540 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
541 16k-aligned base address. The kernel is linked as a
542 position-independent executable (PIE) and contains dynamic relocations
543 which are processed early in the bootup process.
545 One use is for the kexec on panic case where the recovery kernel
546 must live at a different physical address than the primary
549 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
550 it has been loaded at and the compile time physical addresses
551 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
552 setting can still be useful to bootwrappers that need to know the
553 load address of the kernel (eg. u-boot/mkimage).
555 config RELOCATABLE_TEST
556 bool "Test relocatable kernel"
557 depends on (PPC64 && RELOCATABLE)
559 This runs the relocatable kernel at the address it was initially
560 loaded at, which tends to be non-zero and therefore test the
564 bool "Build a dump capture kernel"
565 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
566 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
568 Build a kernel suitable for use as a dump capture kernel.
569 The same kernel binary can be used as production kernel and dump
573 bool "Firmware-assisted dump"
574 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
578 A robust mechanism to get reliable kernel crash dump with
579 assistance from firmware. This approach does not use kexec,
580 instead firmware assists in booting the capture kernel
581 while preserving memory contents. Firmware-assisted dump
582 is meant to be a kdump replacement offering robustness and
583 speed not possible without system firmware assistance.
585 If unsure, say "y". Only special kernels like petitboot may
586 need to say "N" here.
588 config PRESERVE_FA_DUMP
589 bool "Preserve Firmware-assisted dump"
590 depends on PPC64 && PPC_POWERNV && !FA_DUMP
592 On a kernel with FA_DUMP disabled, this option helps to preserve
593 crash data from a previously crash'ed kernel. Useful when the next
594 memory preserving kernel boot would process this crash data.
595 Petitboot kernel is the typical usecase for this option.
598 bool "Export OPAL memory as /sys/firmware/opal/core"
599 depends on PPC64 && PPC_POWERNV
601 This option uses the MPIPL support in firmware to provide an
602 ELF core of OPAL memory after a crash. The ELF core is exported
603 as /sys/firmware/opal/core file which is helpful in debugging
604 OPAL crashes using GDB.
607 bool "Distribute interrupts on all CPUs by default"
610 This option gives the kernel permission to distribute IRQs across
611 multiple CPUs. Saying N here will route all IRQs to the first
612 CPU. Generally saying Y is safe, although some problems have been
613 reported with SMP Power Macintoshes with this option enabled.
618 default y if SMP && PPC_PSERIES
624 depends on NEED_MULTIPLE_NODES
626 config USE_PERCPU_NUMA_NODE_ID
630 config HAVE_MEMORYLESS_NODES
634 config ARCH_SELECT_MEMORY_MODEL
638 config ARCH_FLATMEM_ENABLE
640 depends on (PPC64 && !NUMA) || PPC32
642 config ARCH_SPARSEMEM_ENABLE
645 select SPARSEMEM_VMEMMAP_ENABLE
647 config ARCH_SPARSEMEM_DEFAULT
649 depends on PPC_BOOK3S_64
651 config SYS_SUPPORTS_HUGETLBFS
654 config ILLEGAL_POINTER_VALUE
656 # This is roughly half way between the top of user space and the bottom
657 # of kernel space, which seems about as good as we can get.
658 default 0x5deadbeef0000000 if PPC64
661 config ARCH_MEMORY_PROBE
663 depends on MEMORY_HOTPLUG
665 # Some NUMA nodes have memory ranges that span
666 # other nodes. Even though a pfn is valid and
667 # between a node's start and end pfns, it may not
668 # reside on that node. See memmap_init_zone()
670 config NODES_SPAN_OTHER_NODES
672 depends on NEED_MULTIPLE_NODES
675 bool "Using standard binutils settings"
679 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
680 Note, that kernel will be able to run only those applications,
681 which had been compiled using binutils later than 2.17.50.0.3 with
682 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
683 the older binutils, you can patch them with a trivial patch, which
684 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
690 Select the kernel logical page size. Increasing the page size
691 will reduce software overhead at each page boundary, allow
692 hardware prefetch mechanisms to be more effective, and allow
693 larger dma transfers increasing IO efficiency and reducing
694 overhead. However the utilization of memory will increase.
695 For example, each cached file will using a multiple of the
696 page size to hold its contents and the difference between the
697 end of file and the end of page is wasted.
699 Some dedicated systems, such as software raid serving with
700 accelerated calculations, have shown significant increases.
702 If you configure a 64 bit kernel for 64k pages but the
703 processor does not support them, then the kernel will simulate
704 them with 4k pages, loading them on demand, but with the
705 reduced software overhead and larger internal fragmentation.
706 For the 32 bit kernel, a large page option will not be offered
707 unless it is supported by the configured processor.
709 If unsure, choose 4K_PAGES.
713 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
717 depends on 44x || PPC_8xx
721 depends on 44x || PPC_BOOK3S_64
722 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
724 config PPC_256K_PAGES
725 bool "256k page size"
726 depends on 44x && !STDBINUTILS && !PPC_47x
728 Make the page size 256k.
730 As the ELF standard only requires alignment to support page
731 sizes up to 64k, you will need to compile all of your user
732 space applications with a non-standard binutils settings
733 (see the STDBINUTILS description for details).
735 Say N unless you know what you are doing.
739 config PPC_PAGE_SHIFT
741 default 18 if PPC_256K_PAGES
742 default 16 if PPC_64K_PAGES
743 default 14 if PPC_16K_PAGES
747 int "Thread shift" if EXPERT
749 default "15" if PPC_256K_PAGES
750 default "14" if PPC64
751 default "14" if KASAN
754 Used to define the stack size. The default is almost always what you
755 want. Only change this if you know what you are doing.
757 config ETEXT_SHIFT_BOOL
758 bool "Set custom etext alignment" if STRICT_KERNEL_RWX && \
759 (PPC_BOOK3S_32 || PPC_8xx)
760 depends on ADVANCED_OPTIONS
762 This option allows you to set the kernel end of text alignment. When
763 RAM is mapped by blocks, the alignment needs to fit the size and
764 number of possible blocks. The default should be OK for most configs.
766 Say N here unless you know what you are doing.
769 int "_etext shift" if ETEXT_SHIFT_BOOL
770 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
771 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
772 default 17 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
773 default 19 if STRICT_KERNEL_RWX && PPC_8xx
774 default PPC_PAGE_SHIFT
776 On Book3S 32 (603+), IBATs are used to map kernel text.
777 Smaller is the alignment, greater is the number of necessary IBATs.
779 On 8xx, large pages (512kb or 8M) are used to map kernel linear
780 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
783 config DATA_SHIFT_BOOL
784 bool "Set custom data alignment" if STRICT_KERNEL_RWX && \
785 (PPC_BOOK3S_32 || PPC_8xx)
786 depends on ADVANCED_OPTIONS
788 This option allows you to set the kernel data alignment. When
789 RAM is mapped by blocks, the alignment needs to fit the size and
790 number of possible blocks. The default should be OK for most configs.
792 Say N here unless you know what you are doing.
795 int "Data shift" if DATA_SHIFT_BOOL
796 default 24 if STRICT_KERNEL_RWX && PPC64
797 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
798 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
799 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
800 default 23 if STRICT_KERNEL_RWX && PPC_8xx
801 default PPC_PAGE_SHIFT
803 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
804 Smaller is the alignment, greater is the number of necessary DBATs.
806 On 8xx, large pages (512kb or 8M) are used to map kernel linear
807 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
810 config FORCE_MAX_ZONEORDER
811 int "Maximum zone order"
812 range 8 9 if PPC64 && PPC_64K_PAGES
813 default "9" if PPC64 && PPC_64K_PAGES
814 range 13 13 if PPC64 && !PPC_64K_PAGES
815 default "13" if PPC64 && !PPC_64K_PAGES
816 range 9 64 if PPC32 && PPC_16K_PAGES
817 default "9" if PPC32 && PPC_16K_PAGES
818 range 7 64 if PPC32 && PPC_64K_PAGES
819 default "7" if PPC32 && PPC_64K_PAGES
820 range 5 64 if PPC32 && PPC_256K_PAGES
821 default "5" if PPC32 && PPC_256K_PAGES
825 The kernel memory allocator divides physically contiguous memory
826 blocks into "zones", where each zone is a power of two number of
827 pages. This option selects the largest power of two that the kernel
828 keeps in the memory allocator. If you need to allocate very large
829 blocks of physically contiguous memory, then you may need to
832 This config option is actually maximum order plus one. For example,
833 a value of 11 means that the largest free memory block is 2^10 pages.
835 The page size is not necessarily 4KB. For example, on 64-bit
836 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
837 this in mind when choosing a value for this option.
839 config PPC_SUBPAGE_PROT
840 bool "Support setting protections for 4k subpages"
841 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
843 This option adds support for a system call to allow user programs
844 to set access permissions (read/write, readonly, or no access)
845 on the 4k subpages of each 64k page.
847 config PPC_COPRO_BASE
851 bool "SMT (Hyperthreading) scheduler support"
852 depends on PPC64 && SMP
854 SMT scheduler support improves the CPU scheduler's decision making
855 when dealing with POWER5 cpus at a cost of slightly increased
856 overhead in some places. If unsure say N here.
858 config PPC_DENORMALISATION
859 bool "PowerPC denormalisation exception handling"
860 depends on PPC_BOOK3S_64
861 default "y" if PPC_POWERNV
863 Add support for handling denormalisation of single precision
864 values. Useful for bare metal only. If unsure say Y here.
867 bool "Default bootloader kernel arguments"
870 string "Initial kernel command string" if CMDLINE_BOOL
871 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" if CMDLINE_BOOL
874 On some platforms, there is currently no way for the boot loader to
875 pass arguments to the kernel. For these platforms, you can supply
876 some command-line options at build time by entering them here. In
877 most cases you will need to specify the root device here.
880 bool "Always use the default kernel command string"
881 depends on CMDLINE_BOOL
883 Always use the default kernel command string, even if the boot
884 loader passes other arguments to the kernel.
885 This is useful if you cannot or don't want to change the
886 command-line options your boot loader passes to the kernel.
889 string "Additional default image types"
891 List additional targets to be built by the bootwrapper here (separated
892 by spaces). This is useful for targets that depend of device tree
893 files in the .dts directory.
895 Targets in this list will be build as part of the default build
896 target, or when the user does a 'make zImage' or a
897 'make zImage.initrd'.
899 If unsure, leave blank
901 config ARCH_WANTS_FREEZER_CONTROL
905 source "kernel/power/Kconfig"
908 bool "Enable seccomp to safely compute untrusted bytecode"
912 This kernel feature is useful for number crunching applications
913 that may need to compute untrusted bytecode during their
914 execution. By using pipes or other transports made available to
915 the process as file descriptors supporting the read/write
916 syscalls, it's possible to isolate those applications in
917 their own address space using seccomp. Once seccomp is
918 enabled via /proc/<pid>/seccomp, it cannot be disabled
919 and the task is only allowed to execute a few safe syscalls
920 defined by each seccomp mode.
922 If unsure, say Y. Only embedded should say N here.
925 prompt "PowerPC Memory Protection Keys"
927 depends on PPC_BOOK3S_64
928 select ARCH_USES_HIGH_VMA_FLAGS
929 select ARCH_HAS_PKEYS
931 Memory Protection Keys provides a mechanism for enforcing
932 page-based protections, but without requiring modification of the
933 page tables when an application changes protection domains.
935 For details, see Documentation/core-api/protection-keys.rst
948 bool "Support for ISA-bus hardware"
952 Find out whether you have ISA slots on your motherboard. ISA is the
953 name of a bus system, i.e. the way the CPU talks to the other stuff
954 inside your box. If you have an Apple machine, say N here; if you
955 have an IBM RS/6000 or pSeries machine, say Y. If you have an
956 embedded board, consult your board documentation.
958 config GENERIC_ISA_DMA
960 depends on ISA_DMA_API
963 config PPC_INDIRECT_PCI
966 default y if 40x || 44x
976 select ARCH_HAS_DMA_SET_MASK
977 select PPC_INDIRECT_PCI
983 depends on SUSPEND && (PPC_85xx || PPC_86xx)
985 Freescale MPC85xx/MPC86xx power management controller support
986 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
991 depends on SUSPEND && (44x || 40x)
993 PPC4xx Clock Power Management (CPM) support (suspend/resume).
994 It also enables support for two different idle states (idle-wait
1001 bool "Freescale Local Bus support"
1003 Enables reporting of errors from the Freescale local bus
1004 controller. Also contains some common code used by
1005 drivers for specific local bus peripherals.
1009 depends on PPC_83xx || QUICC_ENGINE || CPM2
1011 Freescale General-purpose Timers support
1015 depends on PCI && 8260
1016 select PPC_INDIRECT_PCI
1020 bool "Freescale Embedded SRIO Controller support"
1021 depends on RAPIDIO = y && HAVE_RAPIDIO
1024 Include support for RapidIO controller on Freescale embedded
1025 processors (MPC8548, MPC8641, etc).
1027 config PPC_RTAS_FILTER
1028 bool "Enable filtering of RTAS syscalls"
1032 The RTAS syscall API has security issues that could be used to
1033 compromise system integrity. This option enforces restrictions on the
1034 RTAS calls and arguments passed by userspace programs to mitigate
1037 Say Y unless you know what you are doing and the filter is causing
1042 config NONSTATIC_KERNEL
1045 menu "Advanced setup"
1048 config ADVANCED_OPTIONS
1049 bool "Prompt for advanced kernel configuration options"
1051 This option will enable prompting for a variety of advanced kernel
1052 configuration options. These options can cause the kernel to not
1053 work if they are set incorrectly, but can be used to optimize certain
1054 aspects of kernel memory management.
1056 Unless you know what you are doing, say N here.
1058 comment "Default settings for advanced configuration options are used"
1059 depends on !ADVANCED_OPTIONS
1061 config LOWMEM_SIZE_BOOL
1062 bool "Set maximum low memory"
1063 depends on ADVANCED_OPTIONS
1065 This option allows you to set the maximum amount of memory which
1066 will be used as "low memory", that is, memory which the kernel can
1067 access directly, without having to set up a kernel virtual mapping.
1068 This can be useful in optimizing the layout of kernel virtual
1071 Say N here unless you know what you are doing.
1074 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1075 default "0x30000000"
1077 config LOWMEM_CAM_NUM_BOOL
1078 bool "Set number of CAMs to use to map low memory"
1079 depends on ADVANCED_OPTIONS && FSL_BOOKE
1081 This option allows you to set the maximum number of CAM slots that
1082 will be used to map low memory. There are a limited number of slots
1083 available and even more limited number that will fit in the L1 MMU.
1084 However, using more entries will allow mapping more low memory. This
1085 can be useful in optimizing the layout of kernel virtual memory.
1087 Say N here unless you know what you are doing.
1089 config LOWMEM_CAM_NUM
1090 depends on FSL_BOOKE
1091 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1094 config DYNAMIC_MEMSTART
1095 bool "Enable page aligned dynamic load address for kernel"
1096 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1097 select NONSTATIC_KERNEL
1099 This option enables the kernel to be loaded at any page aligned
1100 physical address. The kernel creates a mapping from KERNELBASE to
1101 the address where the kernel is loaded. The page size here implies
1102 the TLB page size of the mapping for kernel on the particular platform.
1103 Please refer to the init code for finding the TLB page size.
1105 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1106 kernel image, where the only restriction is the page aligned kernel
1107 load address. When this option is enabled, the compile time physical
1108 address CONFIG_PHYSICAL_START is ignored.
1110 This option is overridden by CONFIG_RELOCATABLE
1112 config PAGE_OFFSET_BOOL
1113 bool "Set custom page offset address"
1114 depends on ADVANCED_OPTIONS
1116 This option allows you to set the kernel virtual address at which
1117 the kernel will map low memory. This can be useful in optimizing
1118 the virtual memory layout of the system.
1120 Say N here unless you know what you are doing.
1123 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1124 default "0xc0000000"
1126 config KERNEL_START_BOOL
1127 bool "Set custom kernel base address"
1128 depends on ADVANCED_OPTIONS
1130 This option allows you to set the kernel virtual address at which
1131 the kernel will be loaded. Normally this should match PAGE_OFFSET
1132 however there are times (like kdump) that one might not want them
1135 Say N here unless you know what you are doing.
1138 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1139 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1140 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1141 default "0xc0000000"
1143 config PHYSICAL_START_BOOL
1144 bool "Set physical address where the kernel is loaded"
1145 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1147 This gives the physical address where the kernel is loaded.
1149 Say N here unless you know what you are doing.
1151 config PHYSICAL_START
1152 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1153 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1154 default "0x00000000"
1156 config PHYSICAL_ALIGN
1158 default "0x04000000" if FSL_BOOKE
1160 This value puts the alignment restrictions on physical address
1161 where kernel is loaded and run from. Kernel is compiled for an
1162 address which meets above alignment restriction.
1164 config TASK_SIZE_BOOL
1165 bool "Set custom user task size"
1166 depends on ADVANCED_OPTIONS
1168 This option allows you to set the amount of virtual address space
1169 allocated to user tasks. This can be useful in optimizing the
1170 virtual memory layout of the system.
1172 Say N here unless you know what you are doing.
1175 hex "Size of user task space" if TASK_SIZE_BOOL
1176 default "0x80000000" if PPC_8xx
1177 default "0xc0000000"
1180 bool "Pinned Kernel TLBs (860 ONLY)"
1181 depends on ADVANCED_OPTIONS && PPC_8xx && \
1182 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1185 bool "Pinned TLB for DATA"
1190 bool "Pinned TLB for IMMR"
1191 depends on PIN_TLB || PPC_EARLY_DEBUG_CPM
1195 bool "Pinned TLB for TEXT"
1201 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1204 default "0xc000000000000000"
1207 default "0xc000000000000000"
1208 config PHYSICAL_START
1210 default "0x00000000"
1216 config PPC_LIB_RHEAP
1219 source "arch/powerpc/kvm/Kconfig"
1221 source "kernel/livepatch/Kconfig"