| blob | 81b0031f909f6d65855ed3051505a4baa9469a64 |
1 source "arch/powerpc/platforms/Kconfig.cputype"
3 config PPC32
4 bool
5 default y if !PPC64
7 config 32BIT
8 bool
9 default y if PPC32
11 config 64BIT
12 bool
13 default y if PPC64
15 config ARCH_PHYS_ADDR_T_64BIT
16 def_bool PPC64 || PHYS_64BIT
18 config ARCH_DMA_ADDR_T_64BIT
19 def_bool ARCH_PHYS_ADDR_T_64BIT
21 config MMU
22 bool
23 default y
25 config ARCH_MMAP_RND_BITS_MAX
26 # On Book3S 64, the default virtual address space for 64-bit processes
27 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
28 # 32T of address space (2^45), which should ensure a reasonable gap
29 # between bottom-up and top-down allocations for applications that
30 # consume "normal" amounts of address space. Book3S 64 only supports 64K
31 # and 4K page sizes.
32 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
33 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K)
34 #
35 # On all other 64-bit platforms (currently only Book3E), the virtual
36 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
37 # of address space (2^44). Only 4K page sizes are supported.
38 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K)
39 #
40 # For 32-bit, use the compat values, as they're the same.
41 default ARCH_MMAP_RND_COMPAT_BITS_MAX
43 config ARCH_MMAP_RND_BITS_MIN
44 # Allow randomisation to consume up to 1GB of address space (2^30).
45 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K)
46 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K)
47 #
48 # For 32-bit, use the compat values, as they're the same.
49 default ARCH_MMAP_RND_COMPAT_BITS_MIN
51 config ARCH_MMAP_RND_COMPAT_BITS_MAX
52 # Total virtual address space for 32-bit processes is 2^31 (2GB).
53 # Allow randomisation to consume up to 512MB of address space (2^29).
54 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K)
55 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K)
56 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K)
57 default 17 # 17 = 29 (512MB) - 12 (4K)
59 config ARCH_MMAP_RND_COMPAT_BITS_MIN
60 # Total virtual address space for 32-bit processes is 2^31 (2GB).
61 # Allow randomisation to consume up to 8MB of address space (2^23).
62 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K)
63 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K)
64 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K)
65 default 11 # 11 = 23 (8MB) - 12 (4K)
67 config HAVE_SETUP_PER_CPU_AREA
68 def_bool PPC64
70 config NEED_PER_CPU_EMBED_FIRST_CHUNK
71 def_bool PPC64
73 config NR_IRQS
74 int "Number of virtual interrupt numbers"
75 range 32 32768
76 default "512"
77 help
78 This defines the number of virtual interrupt numbers the kernel
79 can manage. Virtual interrupt numbers are what you see in
80 /proc/interrupts. If you configure your system to have too few,
81 drivers will fail to load or worse - handle with care.
83 config NMI_IPI
84 bool
85 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
86 default y
88 config STACKTRACE_SUPPORT
89 bool
90 default y
92 config TRACE_IRQFLAGS_SUPPORT
93 bool
94 default y
96 config LOCKDEP_SUPPORT
97 bool
98 default y
100 config RWSEM_GENERIC_SPINLOCK
101 bool
103 config RWSEM_XCHGADD_ALGORITHM
104 bool
105 default y
107 config GENERIC_LOCKBREAK
108 bool
109 default y
110 depends on SMP && PREEMPT
112 config GENERIC_HWEIGHT
113 bool
114 default y
116 config ARCH_HAS_DMA_SET_COHERENT_MASK
117 bool
119 config PPC
120 bool
121 default y
122 #
123 # Please keep this list sorted alphabetically.
124 #
125 select ARCH_HAS_DEVMEM_IS_ALLOWED
126 select ARCH_HAS_DMA_SET_COHERENT_MASK
127 select ARCH_HAS_ELF_RANDOMIZE
128 select ARCH_HAS_FORTIFY_SOURCE
129 select ARCH_HAS_GCOV_PROFILE_ALL
130 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE
131 select ARCH_HAS_SG_CHAIN
132 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
133 select ARCH_HAS_UBSAN_SANITIZE_ALL
134 select ARCH_HAS_ZONE_DEVICE if PPC_BOOK3S_64
135 select ARCH_HAVE_NMI_SAFE_CMPXCHG
136 select ARCH_MIGHT_HAVE_PC_PARPORT
137 select ARCH_MIGHT_HAVE_PC_SERIO
138 select ARCH_SUPPORTS_ATOMIC_RMW
139 select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
140 select ARCH_USE_BUILTIN_BSWAP
141 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
142 select ARCH_WANT_IPC_PARSE_VERSION
143 select ARCH_WEAK_RELEASE_ACQUIRE
144 select BINFMT_ELF
145 select BUILDTIME_EXTABLE_SORT
146 select CLONE_BACKWARDS
147 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
148 select EDAC_ATOMIC_SCRUB
149 select EDAC_SUPPORT
150 select GENERIC_ATOMIC64 if PPC32
151 select GENERIC_CLOCKEVENTS
152 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
153 select GENERIC_CMOS_UPDATE
154 select GENERIC_CPU_AUTOPROBE
155 select GENERIC_IRQ_SHOW
156 select GENERIC_IRQ_SHOW_LEVEL
157 select GENERIC_SMP_IDLE_THREAD
158 select GENERIC_STRNCPY_FROM_USER
159 select GENERIC_STRNLEN_USER
160 select GENERIC_TIME_VSYSCALL
161 select HAVE_ARCH_AUDITSYSCALL
162 select HAVE_ARCH_JUMP_LABEL
163 select HAVE_ARCH_KGDB
164 select HAVE_ARCH_MMAP_RND_BITS
165 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
166 select HAVE_ARCH_SECCOMP_FILTER
167 select HAVE_ARCH_TRACEHOOK
168 select ARCH_HAS_STRICT_KERNEL_RWX if (PPC_BOOK3S_64 && !RELOCATABLE && !HIBERNATION)
169 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
170 select HAVE_CBPF_JIT if !PPC64
171 select HAVE_CONTEXT_TRACKING if PPC64
172 select HAVE_DEBUG_KMEMLEAK
173 select HAVE_DEBUG_STACKOVERFLOW
174 select HAVE_DMA_API_DEBUG
175 select HAVE_DYNAMIC_FTRACE
176 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
177 select HAVE_EBPF_JIT if PPC64
178 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
179 select HAVE_FTRACE_MCOUNT_RECORD
180 select HAVE_FUNCTION_GRAPH_TRACER
181 select HAVE_FUNCTION_TRACER
182 select HAVE_GCC_PLUGINS
183 select HAVE_GENERIC_GUP
184 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
185 select HAVE_IDE
186 select HAVE_IOREMAP_PROT
187 select HAVE_IRQ_EXIT_ON_IRQ_STACK
188 select HAVE_KERNEL_GZIP
189 select HAVE_KPROBES
190 select HAVE_KPROBES_ON_FTRACE
191 select HAVE_KRETPROBES
192 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
193 select HAVE_MEMBLOCK
194 select HAVE_MEMBLOCK_NODE_MAP
195 select HAVE_MOD_ARCH_SPECIFIC
196 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
197 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
198 select HAVE_OPROFILE
199 select HAVE_OPTPROBES if PPC64
200 select HAVE_PERF_EVENTS
201 select HAVE_PERF_EVENTS_NMI if PPC64
202 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
203 select HAVE_PERF_REGS
204 select HAVE_PERF_USER_STACK_DUMP
205 select HAVE_RCU_TABLE_FREE if SMP
206 select HAVE_REGS_AND_STACK_ACCESS_API
207 select HAVE_SYSCALL_TRACEPOINTS
208 select HAVE_VIRT_CPU_ACCOUNTING
209 select HAVE_IRQ_TIME_ACCOUNTING
210 select IRQ_DOMAIN
211 select IRQ_FORCED_THREADING
212 select MODULES_USE_ELF_RELA
213 select NO_BOOTMEM
214 select OF
215 select OF_EARLY_FLATTREE
216 select OF_RESERVED_MEM
217 select OLD_SIGACTION if PPC32
218 select OLD_SIGSUSPEND
219 select SPARSE_IRQ
220 select SYSCTL_EXCEPTION_TRACE
221 select VIRT_TO_BUS if !PPC64
222 #
223 # Please keep this list sorted alphabetically.
224 #
226 config GENERIC_CSUM
227 def_bool n
229 config EARLY_PRINTK
230 bool
231 default y
233 config PANIC_TIMEOUT
234 int
235 default 180
237 config COMPAT
238 bool
239 default y if PPC64
240 select COMPAT_BINFMT_ELF
241 select ARCH_WANT_OLD_COMPAT_IPC
242 select COMPAT_OLD_SIGACTION
244 config SYSVIPC_COMPAT
245 bool
246 depends on COMPAT && SYSVIPC
247 default y
249 # All PPC32s use generic nvram driver through ppc_md
250 config GENERIC_NVRAM
251 bool
252 default y if PPC32
254 config SCHED_OMIT_FRAME_POINTER
255 bool
256 default y
258 config ARCH_MAY_HAVE_PC_FDC
259 bool
260 default PCI
262 config PPC_UDBG_16550
263 bool
264 default n
266 config GENERIC_TBSYNC
267 bool
268 default y if PPC32 && SMP
269 default n
271 config AUDIT_ARCH
272 bool
273 default y
275 config GENERIC_BUG
276 bool
277 default y
278 depends on BUG
280 config SYS_SUPPORTS_APM_EMULATION
281 default y if PMAC_APM_EMU
282 bool
284 config EPAPR_BOOT
285 bool
286 help
287 Used to allow a board to specify it wants an ePAPR compliant wrapper.
288 default n
290 config DEFAULT_UIMAGE
291 bool
292 help
293 Used to allow a board to specify it wants a uImage built by default
294 default n
296 config ARCH_HIBERNATION_POSSIBLE
297 bool
298 default y
300 config ARCH_SUSPEND_POSSIBLE
301 def_bool y
302 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
303 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
304 || 44x || 40x
306 config PPC_DCR_NATIVE
307 bool
308 default n
310 config PPC_DCR_MMIO
311 bool
312 default n
314 config PPC_DCR
315 bool
316 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
317 default y
319 config PPC_OF_PLATFORM_PCI
320 bool
321 depends on PCI
322 depends on PPC64 # not supported on 32 bits yet
323 default n
325 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
326 depends on PPC32 || PPC_STD_MMU_64
327 def_bool y
329 config ARCH_SUPPORTS_UPROBES
330 def_bool y
332 config PPC_ADV_DEBUG_REGS
333 bool
334 depends on 40x || BOOKE
335 default y
337 config PPC_ADV_DEBUG_IACS
338 int
339 depends on PPC_ADV_DEBUG_REGS
340 default 4 if 44x
341 default 2
343 config PPC_ADV_DEBUG_DACS
344 int
345 depends on PPC_ADV_DEBUG_REGS
346 default 2
348 config PPC_ADV_DEBUG_DVCS
349 int
350 depends on PPC_ADV_DEBUG_REGS
351 default 2 if 44x
352 default 0
354 config PPC_ADV_DEBUG_DAC_RANGE
355 bool
356 depends on PPC_ADV_DEBUG_REGS && 44x
357 default y
359 config PPC_EMULATE_SSTEP
360 bool
361 default y if KPROBES || UPROBES || XMON || HAVE_HW_BREAKPOINT
363 config ZONE_DMA32
364 bool
365 default y if PPC64
367 config PGTABLE_LEVELS
368 int
369 default 2 if !PPC64
370 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
371 default 4
373 source "init/Kconfig"
375 source "kernel/Kconfig.freezer"
377 source "arch/powerpc/sysdev/Kconfig"
378 source "arch/powerpc/platforms/Kconfig"
380 menu "Kernel options"
382 config HIGHMEM
383 bool "High memory support"
384 depends on PPC32
386 source kernel/Kconfig.hz
387 source kernel/Kconfig.preempt
388 source "fs/Kconfig.binfmt"
390 config HUGETLB_PAGE_SIZE_VARIABLE
391 bool
392 depends on HUGETLB_PAGE
393 default y
395 config MATH_EMULATION
396 bool "Math emulation"
397 depends on 4xx || 8xx || PPC_MPC832x || BOOKE
398 ---help---
399 Some PowerPC chips designed for embedded applications do not have
400 a floating-point unit and therefore do not implement the
401 floating-point instructions in the PowerPC instruction set. If you
402 say Y here, the kernel will include code to emulate a floating-point
403 unit, which will allow programs that use floating-point
404 instructions to run.
406 This is also useful to emulate missing (optional) instructions
407 such as fsqrt on cores that do have an FPU but do not implement
408 them (such as Freescale BookE).
410 choice
411 prompt "Math emulation options"
412 default MATH_EMULATION_FULL
413 depends on MATH_EMULATION
415 config MATH_EMULATION_FULL
416 bool "Emulate all the floating point instructions"
417 ---help---
418 Select this option will enable the kernel to support to emulate
419 all the floating point instructions. If your SoC doesn't have
420 a FPU, you should select this.
422 config MATH_EMULATION_HW_UNIMPLEMENTED
423 bool "Just emulate the FPU unimplemented instructions"
424 ---help---
425 Select this if you know there does have a hardware FPU on your
426 SoC, but some floating point instructions are not implemented by that.
428 endchoice
430 config PPC_TRANSACTIONAL_MEM
431 bool "Transactional Memory support for POWERPC"
432 depends on PPC_BOOK3S_64
433 depends on SMP
434 select ALTIVEC
435 select VSX
436 default n
437 ---help---
438 Support user-mode Transactional Memory on POWERPC.
440 config LD_HEAD_STUB_CATCH
441 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
442 depends on PPC64
443 default n
444 help
445 Very large kernels can cause linker branch stubs to be generated by
446 code in head_64.S, which moves the head text sections out of their
447 specified location. This option can work around the problem.
449 If unsure, say "N".
451 config DISABLE_MPROFILE_KERNEL
452 bool "Disable use of mprofile-kernel for kernel tracing"
453 depends on PPC64 && CPU_LITTLE_ENDIAN
454 default y
455 help
456 Selecting this options disables use of the mprofile-kernel ABI for
457 kernel tracing. That will cause options such as live patching
458 (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
459 be disabled also.
461 If you have a toolchain which supports mprofile-kernel, then you can
462 disable this. Otherwise leave it enabled. If you're not sure, say
463 "Y".
465 config MPROFILE_KERNEL
466 depends on PPC64 && CPU_LITTLE_ENDIAN
467 def_bool !DISABLE_MPROFILE_KERNEL
469 config IOMMU_HELPER
470 def_bool PPC64
472 config SWIOTLB
473 bool "SWIOTLB support"
474 default n
475 select IOMMU_HELPER
476 ---help---
477 Support for IO bounce buffering for systems without an IOMMU.
478 This allows us to DMA to the full physical address space on
479 platforms where the size of a physical address is larger
480 than the bus address. Not all platforms support this.
482 config HOTPLUG_CPU
483 bool "Support for enabling/disabling CPUs"
484 depends on SMP && (PPC_PSERIES || \
485 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
486 ---help---
487 Say Y here to be able to disable and re-enable individual
488 CPUs at runtime on SMP machines.
490 Say N if you are unsure.
492 config ARCH_CPU_PROBE_RELEASE
493 def_bool y
494 depends on HOTPLUG_CPU
496 config ARCH_ENABLE_MEMORY_HOTPLUG
497 def_bool y
499 config ARCH_HAS_WALK_MEMORY
500 def_bool y
502 config ARCH_ENABLE_MEMORY_HOTREMOVE
503 def_bool y
505 config PPC64_SUPPORTS_MEMORY_FAILURE
506 bool "Add support for memory hwpoison"
507 depends on PPC_BOOK3S_64
508 default "y" if PPC_POWERNV
509 select ARCH_SUPPORTS_MEMORY_FAILURE
511 config KEXEC
512 bool "kexec system call"
513 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
514 select KEXEC_CORE
515 help
516 kexec is a system call that implements the ability to shutdown your
517 current kernel, and to start another kernel. It is like a reboot
518 but it is independent of the system firmware. And like a reboot
519 you can start any kernel with it, not just Linux.
521 The name comes from the similarity to the exec system call.
523 It is an ongoing process to be certain the hardware in a machine
524 is properly shutdown, so do not be surprised if this code does not
525 initially work for you. As of this writing the exact hardware
526 interface is strongly in flux, so no good recommendation can be
527 made.
529 config KEXEC_FILE
530 bool "kexec file based system call"
531 select KEXEC_CORE
532 select HAVE_IMA_KEXEC
533 select BUILD_BIN2C
534 depends on PPC64
535 depends on CRYPTO=y
536 depends on CRYPTO_SHA256=y
537 help
538 This is a new version of the kexec system call. This call is
539 file based and takes in file descriptors as system call arguments
540 for kernel and initramfs as opposed to a list of segments as is the
541 case for the older kexec call.
543 config RELOCATABLE
544 bool "Build a relocatable kernel"
545 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
546 select NONSTATIC_KERNEL
547 select MODULE_REL_CRCS if MODVERSIONS
548 help
549 This builds a kernel image that is capable of running at the
550 location the kernel is loaded at. For ppc32, there is no any
551 alignment restrictions, and this feature is a superset of
552 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
553 16k-aligned base address. The kernel is linked as a
554 position-independent executable (PIE) and contains dynamic relocations
555 which are processed early in the bootup process.
557 One use is for the kexec on panic case where the recovery kernel
558 must live at a different physical address than the primary
559 kernel.
561 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
562 it has been loaded at and the compile time physical addresses
563 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
564 setting can still be useful to bootwrappers that need to know the
565 load address of the kernel (eg. u-boot/mkimage).
567 config RELOCATABLE_TEST
568 bool "Test relocatable kernel"
569 depends on (PPC64 && RELOCATABLE)
570 default n
571 help
572 This runs the relocatable kernel at the address it was initially
573 loaded at, which tends to be non-zero and therefore test the
574 relocation code.
576 config CRASH_DUMP
577 bool "Build a dump capture kernel"
578 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
579 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
580 help
581 Build a kernel suitable for use as a dump capture kernel.
582 The same kernel binary can be used as production kernel and dump
583 capture kernel.
585 config FA_DUMP
586 bool "Firmware-assisted dump"
587 depends on PPC64 && PPC_RTAS
588 select CRASH_CORE
589 select CRASH_DUMP
590 help
591 A robust mechanism to get reliable kernel crash dump with
592 assistance from firmware. This approach does not use kexec,
593 instead firmware assists in booting the capture kernel
594 while preserving memory contents. Firmware-assisted dump
595 is meant to be a kdump replacement offering robustness and
596 speed not possible without system firmware assistance.
598 If unsure, say "N"
600 config IRQ_ALL_CPUS
601 bool "Distribute interrupts on all CPUs by default"
602 depends on SMP
603 help
604 This option gives the kernel permission to distribute IRQs across
605 multiple CPUs. Saying N here will route all IRQs to the first
606 CPU. Generally saying Y is safe, although some problems have been
607 reported with SMP Power Macintoshes with this option enabled.
609 config NUMA
610 bool "NUMA support"
611 depends on PPC64
612 default y if SMP && PPC_PSERIES
614 config NODES_SHIFT
615 int
616 default "8" if PPC64
617 default "4"
618 depends on NEED_MULTIPLE_NODES
620 config USE_PERCPU_NUMA_NODE_ID
621 def_bool y
622 depends on NUMA
624 config HAVE_MEMORYLESS_NODES
625 def_bool y
626 depends on NUMA
628 config ARCH_SELECT_MEMORY_MODEL
629 def_bool y
630 depends on PPC64
632 config ARCH_FLATMEM_ENABLE
633 def_bool y
634 depends on (PPC64 && !NUMA) || PPC32
636 config ARCH_SPARSEMEM_ENABLE
637 def_bool y
638 depends on PPC64
639 select SPARSEMEM_VMEMMAP_ENABLE
641 config ARCH_SPARSEMEM_DEFAULT
642 def_bool y
643 depends on PPC_BOOK3S_64
645 config SYS_SUPPORTS_HUGETLBFS
646 bool
648 config ILLEGAL_POINTER_VALUE
649 hex
650 # This is roughly half way between the top of user space and the bottom
651 # of kernel space, which seems about as good as we can get.
652 default 0x5deadbeef0000000 if PPC64
653 default 0
655 source "mm/Kconfig"
657 config ARCH_MEMORY_PROBE
658 def_bool y
659 depends on MEMORY_HOTPLUG
661 # Some NUMA nodes have memory ranges that span
662 # other nodes. Even though a pfn is valid and
663 # between a node's start and end pfns, it may not
664 # reside on that node. See memmap_init_zone()
665 # for details.
666 config NODES_SPAN_OTHER_NODES
667 def_bool y
668 depends on NEED_MULTIPLE_NODES
670 config STDBINUTILS
671 bool "Using standard binutils settings"
672 depends on 44x
673 default y
674 help
675 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
676 Note, that kernel will be able to run only those applications,
677 which had been compiled using binutils later than 2.17.50.0.3 with
678 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
679 the older binutils, you can patch them with a trivial patch, which
680 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
682 choice
683 prompt "Page size"
684 default PPC_4K_PAGES
685 help
686 Select the kernel logical page size. Increasing the page size
687 will reduce software overhead at each page boundary, allow
688 hardware prefetch mechanisms to be more effective, and allow
689 larger dma transfers increasing IO efficiency and reducing
690 overhead. However the utilization of memory will increase.
691 For example, each cached file will using a multiple of the
692 page size to hold its contents and the difference between the
693 end of file and the end of page is wasted.
695 Some dedicated systems, such as software raid serving with
696 accelerated calculations, have shown significant increases.
698 If you configure a 64 bit kernel for 64k pages but the
699 processor does not support them, then the kernel will simulate
700 them with 4k pages, loading them on demand, but with the
701 reduced software overhead and larger internal fragmentation.
702 For the 32 bit kernel, a large page option will not be offered
703 unless it is supported by the configured processor.
705 If unsure, choose 4K_PAGES.
707 config PPC_4K_PAGES
708 bool "4k page size"
709 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
711 config PPC_16K_PAGES
712 bool "16k page size"
713 depends on 44x || PPC_8xx
715 config PPC_64K_PAGES
716 bool "64k page size"
717 depends on !PPC_FSL_BOOK3E && (44x || PPC_STD_MMU_64 || PPC_BOOK3E_64)
718 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
720 config PPC_256K_PAGES
721 bool "256k page size"
722 depends on 44x && !STDBINUTILS
723 help
724 Make the page size 256k.
726 As the ELF standard only requires alignment to support page
727 sizes up to 64k, you will need to compile all of your user
728 space applications with a non-standard binutils settings
729 (see the STDBINUTILS description for details).
731 Say N unless you know what you are doing.
733 endchoice
735 config THREAD_SHIFT
736 int "Thread shift" if EXPERT
737 range 13 15
738 default "15" if PPC_256K_PAGES
739 default "14" if PPC64
740 default "13"
741 help
742 Used to define the stack size. The default is almost always what you
743 want. Only change this if you know what you are doing.
745 config FORCE_MAX_ZONEORDER
746 int "Maximum zone order"
747 range 8 9 if PPC64 && PPC_64K_PAGES
748 default "9" if PPC64 && PPC_64K_PAGES
749 range 13 13 if PPC64 && !PPC_64K_PAGES
750 default "13" if PPC64 && !PPC_64K_PAGES
751 range 9 64 if PPC32 && PPC_16K_PAGES
752 default "9" if PPC32 && PPC_16K_PAGES
753 range 7 64 if PPC32 && PPC_64K_PAGES
754 default "7" if PPC32 && PPC_64K_PAGES
755 range 5 64 if PPC32 && PPC_256K_PAGES
756 default "5" if PPC32 && PPC_256K_PAGES
757 range 11 64
758 default "11"
759 help
760 The kernel memory allocator divides physically contiguous memory
761 blocks into "zones", where each zone is a power of two number of
762 pages. This option selects the largest power of two that the kernel
763 keeps in the memory allocator. If you need to allocate very large
764 blocks of physically contiguous memory, then you may need to
765 increase this value.
767 This config option is actually maximum order plus one. For example,
768 a value of 11 means that the largest free memory block is 2^10 pages.
770 The page size is not necessarily 4KB. For example, on 64-bit
771 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
772 this in mind when choosing a value for this option.
774 config PPC_SUBPAGE_PROT
775 bool "Support setting protections for 4k subpages"
776 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
777 help
778 This option adds support for a system call to allow user programs
779 to set access permissions (read/write, readonly, or no access)
780 on the 4k subpages of each 64k page.
782 config PPC_COPRO_BASE
783 bool
784 default n
786 config SCHED_SMT
787 bool "SMT (Hyperthreading) scheduler support"
788 depends on PPC64 && SMP
789 help
790 SMT scheduler support improves the CPU scheduler's decision making
791 when dealing with POWER5 cpus at a cost of slightly increased
792 overhead in some places. If unsure say N here.
794 config PPC_DENORMALISATION
795 bool "PowerPC denormalisation exception handling"
796 depends on PPC_BOOK3S_64
797 default "y" if PPC_POWERNV
798 ---help---
799 Add support for handling denormalisation of single precision
800 values. Useful for bare metal only. If unsure say Y here.
802 config CMDLINE_BOOL
803 bool "Default bootloader kernel arguments"
805 config CMDLINE
806 string "Initial kernel command string"
807 depends on CMDLINE_BOOL
808 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
809 help
810 On some platforms, there is currently no way for the boot loader to
811 pass arguments to the kernel. For these platforms, you can supply
812 some command-line options at build time by entering them here. In
813 most cases you will need to specify the root device here.
815 config CMDLINE_FORCE
816 bool "Always use the default kernel command string"
817 depends on CMDLINE_BOOL
818 help
819 Always use the default kernel command string, even if the boot
820 loader passes other arguments to the kernel.
821 This is useful if you cannot or don't want to change the
822 command-line options your boot loader passes to the kernel.
824 config EXTRA_TARGETS
825 string "Additional default image types"
826 help
827 List additional targets to be built by the bootwrapper here (separated
828 by spaces). This is useful for targets that depend of device tree
829 files in the .dts directory.
831 Targets in this list will be build as part of the default build
832 target, or when the user does a 'make zImage' or a
833 'make zImage.initrd'.
835 If unsure, leave blank
837 config ARCH_WANTS_FREEZER_CONTROL
838 def_bool y
839 depends on ADB_PMU
841 source kernel/power/Kconfig
843 config SECCOMP
844 bool "Enable seccomp to safely compute untrusted bytecode"
845 depends on PROC_FS
846 default y
847 help
848 This kernel feature is useful for number crunching applications
849 that may need to compute untrusted bytecode during their
850 execution. By using pipes or other transports made available to
851 the process as file descriptors supporting the read/write
852 syscalls, it's possible to isolate those applications in
853 their own address space using seccomp. Once seccomp is
854 enabled via /proc/<pid>/seccomp, it cannot be disabled
855 and the task is only allowed to execute a few safe syscalls
856 defined by each seccomp mode.
858 If unsure, say Y. Only embedded should say N here.
860 endmenu
862 config ISA_DMA_API
863 bool
864 default PCI
866 menu "Bus options"
868 config ISA
869 bool "Support for ISA-bus hardware"
870 depends on PPC_CHRP
871 select PPC_I8259
872 help
873 Find out whether you have ISA slots on your motherboard. ISA is the
874 name of a bus system, i.e. the way the CPU talks to the other stuff
875 inside your box. If you have an Apple machine, say N here; if you
876 have an IBM RS/6000 or pSeries machine, say Y. If you have an
877 embedded board, consult your board documentation.
879 config ZONE_DMA
880 bool
881 default y
883 config NEED_DMA_MAP_STATE
884 def_bool (PPC64 || NOT_COHERENT_CACHE)
886 config NEED_SG_DMA_LENGTH
887 def_bool y
889 config GENERIC_ISA_DMA
890 bool
891 depends on ISA_DMA_API
892 default y
894 config PPC_INDIRECT_PCI
895 bool
896 depends on PCI
897 default y if 40x || 44x
898 default n
900 config EISA
901 bool
903 config SBUS
904 bool
906 config FSL_SOC
907 bool
909 config FSL_PCI
910 bool
911 select PPC_INDIRECT_PCI
912 select PCI_QUIRKS
914 config FSL_PMC
915 bool
916 default y
917 depends on SUSPEND && (PPC_85xx || PPC_86xx)
918 help
919 Freescale MPC85xx/MPC86xx power management controller support
920 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
922 config PPC4xx_CPM
923 bool
924 default y
925 depends on SUSPEND && (44x || 40x)
926 help
927 PPC4xx Clock Power Management (CPM) support (suspend/resume).
928 It also enables support for two different idle states (idle-wait
929 and idle-doze).
931 config 4xx_SOC
932 bool
934 config FSL_LBC
935 bool "Freescale Local Bus support"
936 help
937 Enables reporting of errors from the Freescale local bus
938 controller. Also contains some common code used by
939 drivers for specific local bus peripherals.
941 config FSL_GTM
942 bool
943 depends on PPC_83xx || QUICC_ENGINE || CPM2
944 help
945 Freescale General-purpose Timers support
947 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
948 config MCA
949 bool
951 # Platforms that what PCI turned unconditionally just do select PCI
952 # in their config node. Platforms that want to choose at config
953 # time should select PPC_PCI_CHOICE
954 config PPC_PCI_CHOICE
955 bool
957 config PCI
958 bool "PCI support" if PPC_PCI_CHOICE
959 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
960 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
961 default PCI_QSPAN if !4xx && !CPM2 && 8xx
962 select GENERIC_PCI_IOMAP
963 help
964 Find out whether your system includes a PCI bus. PCI is the name of
965 a bus system, i.e. the way the CPU talks to the other stuff inside
966 your box. If you say Y here, the kernel will include drivers and
967 infrastructure code to support PCI bus devices.
969 config PCI_DOMAINS
970 def_bool PCI
972 config PCI_SYSCALL
973 def_bool PCI
975 config PCI_QSPAN
976 bool "QSpan PCI"
977 depends on !4xx && !CPM2 && 8xx
978 select PPC_I8259
979 help
980 Say Y here if you have a system based on a Motorola 8xx-series
981 embedded processor with a QSPAN PCI interface, otherwise say N.
983 config PCI_8260
984 bool
985 depends on PCI && 8260
986 select PPC_INDIRECT_PCI
987 default y
989 source "drivers/pci/Kconfig"
991 source "drivers/pcmcia/Kconfig"
993 config HAS_RAPIDIO
994 bool
995 default n
997 config RAPIDIO
998 tristate "RapidIO support"
999 depends on HAS_RAPIDIO || PCI
1000 help
1001 If you say Y here, the kernel will include drivers and
1002 infrastructure code to support RapidIO interconnect devices.
1004 config FSL_RIO
1005 bool "Freescale Embedded SRIO Controller support"
1006 depends on RAPIDIO = y && HAS_RAPIDIO
1007 default "n"
1008 ---help---
1009 Include support for RapidIO controller on Freescale embedded
1010 processors (MPC8548, MPC8641, etc).
1012 source "drivers/rapidio/Kconfig"
1014 endmenu
1016 config NONSTATIC_KERNEL
1017 bool
1018 default n
1020 menu "Advanced setup"
1021 depends on PPC32
1023 config ADVANCED_OPTIONS
1024 bool "Prompt for advanced kernel configuration options"
1025 help
1026 This option will enable prompting for a variety of advanced kernel
1027 configuration options. These options can cause the kernel to not
1028 work if they are set incorrectly, but can be used to optimize certain
1029 aspects of kernel memory management.
1031 Unless you know what you are doing, say N here.
1033 comment "Default settings for advanced configuration options are used"
1034 depends on !ADVANCED_OPTIONS
1036 config LOWMEM_SIZE_BOOL
1037 bool "Set maximum low memory"
1038 depends on ADVANCED_OPTIONS
1039 help
1040 This option allows you to set the maximum amount of memory which
1041 will be used as "low memory", that is, memory which the kernel can
1042 access directly, without having to set up a kernel virtual mapping.
1043 This can be useful in optimizing the layout of kernel virtual
1044 memory.
1046 Say N here unless you know what you are doing.
1048 config LOWMEM_SIZE
1049 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1050 default "0x30000000"
1052 config LOWMEM_CAM_NUM_BOOL
1053 bool "Set number of CAMs to use to map low memory"
1054 depends on ADVANCED_OPTIONS && FSL_BOOKE
1055 help
1056 This option allows you to set the maximum number of CAM slots that
1057 will be used to map low memory. There are a limited number of slots
1058 available and even more limited number that will fit in the L1 MMU.
1059 However, using more entries will allow mapping more low memory. This
1060 can be useful in optimizing the layout of kernel virtual memory.
1062 Say N here unless you know what you are doing.
1064 config LOWMEM_CAM_NUM
1065 depends on FSL_BOOKE
1066 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1067 default 3
1069 config DYNAMIC_MEMSTART
1070 bool "Enable page aligned dynamic load address for kernel"
1071 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1072 select NONSTATIC_KERNEL
1073 help
1074 This option enables the kernel to be loaded at any page aligned
1075 physical address. The kernel creates a mapping from KERNELBASE to
1076 the address where the kernel is loaded. The page size here implies
1077 the TLB page size of the mapping for kernel on the particular platform.
1078 Please refer to the init code for finding the TLB page size.
1080 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1081 kernel image, where the only restriction is the page aligned kernel
1082 load address. When this option is enabled, the compile time physical
1083 address CONFIG_PHYSICAL_START is ignored.
1085 This option is overridden by CONFIG_RELOCATABLE
1087 config PAGE_OFFSET_BOOL
1088 bool "Set custom page offset address"
1089 depends on ADVANCED_OPTIONS
1090 help
1091 This option allows you to set the kernel virtual address at which
1092 the kernel will map low memory. This can be useful in optimizing
1093 the virtual memory layout of the system.
1095 Say N here unless you know what you are doing.
1097 config PAGE_OFFSET
1098 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1099 default "0xc0000000"
1101 config KERNEL_START_BOOL
1102 bool "Set custom kernel base address"
1103 depends on ADVANCED_OPTIONS
1104 help
1105 This option allows you to set the kernel virtual address at which
1106 the kernel will be loaded. Normally this should match PAGE_OFFSET
1107 however there are times (like kdump) that one might not want them
1108 to be the same.
1110 Say N here unless you know what you are doing.
1112 config KERNEL_START
1113 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1114 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1115 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1116 default "0xc0000000"
1118 config PHYSICAL_START_BOOL
1119 bool "Set physical address where the kernel is loaded"
1120 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1121 help
1122 This gives the physical address where the kernel is loaded.
1124 Say N here unless you know what you are doing.
1126 config PHYSICAL_START
1127 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1128 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1129 default "0x00000000"
1131 config PHYSICAL_ALIGN
1132 hex
1133 default "0x04000000" if FSL_BOOKE
1134 help
1135 This value puts the alignment restrictions on physical address
1136 where kernel is loaded and run from. Kernel is compiled for an
1137 address which meets above alignment restriction.
1139 config TASK_SIZE_BOOL
1140 bool "Set custom user task size"
1141 depends on ADVANCED_OPTIONS
1142 help
1143 This option allows you to set the amount of virtual address space
1144 allocated to user tasks. This can be useful in optimizing the
1145 virtual memory layout of the system.
1147 Say N here unless you know what you are doing.
1149 config TASK_SIZE
1150 hex "Size of user task space" if TASK_SIZE_BOOL
1151 default "0x80000000" if PPC_8xx
1152 default "0xc0000000"
1154 config CONSISTENT_SIZE_BOOL
1155 bool "Set custom consistent memory pool size"
1156 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1157 help
1158 This option allows you to set the size of the
1159 consistent memory pool. This pool of virtual memory
1160 is used to make consistent memory allocations.
1162 config CONSISTENT_SIZE
1163 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1164 default "0x00200000" if NOT_COHERENT_CACHE
1166 config PIN_TLB
1167 bool "Pinned Kernel TLBs (860 ONLY)"
1168 depends on ADVANCED_OPTIONS && 8xx
1170 config PIN_TLB_IMMR
1171 bool "Pinned TLB for IMMR"
1172 depends on PIN_TLB
1173 default y
1174 endmenu
1176 if PPC64
1177 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1178 config PAGE_OFFSET
1179 hex
1180 default "0xc000000000000000"
1181 config KERNEL_START
1182 hex
1183 default "0xc000000000000000"
1184 config PHYSICAL_START
1185 hex
1186 default "0x00000000"
1187 endif
1189 config ARCH_RANDOM
1190 def_bool n
1192 source "net/Kconfig"
1194 source "drivers/Kconfig"
1196 source "fs/Kconfig"
1198 source "lib/Kconfig"
1200 source "arch/powerpc/Kconfig.debug"
1202 source "security/Kconfig"
1204 source "crypto/Kconfig"
1206 config PPC_LIB_RHEAP
1207 bool
1209 source "arch/powerpc/kvm/Kconfig"
1211 source "kernel/livepatch/Kconfig"