| blob | 9f2b75fe2c2d40c842c3398009c27ef9217be31d |
1 # SPDX-License-Identifier: GPL-2.0
2 source "arch/powerpc/platforms/Kconfig.cputype"
4 config PPC32
5 bool
6 default y if !PPC64
8 config 32BIT
9 bool
10 default y if PPC32
12 config 64BIT
13 bool
14 default y if PPC64
16 config MMU
17 bool
18 default y
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
26 # and 4K page sizes.
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)
29 #
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)
34 #
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)
42 #
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
63 def_bool PPC64
65 config NEED_PER_CPU_EMBED_FIRST_CHUNK
66 def_bool PPC64
68 config NR_IRQS
69 int "Number of virtual interrupt numbers"
70 range 32 32768
71 default "512"
72 help
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.
78 config NMI_IPI
79 bool
80 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
81 default y
83 config PPC_WATCHDOG
84 bool
85 depends on HARDLOCKUP_DETECTOR
86 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
87 default y
88 help
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
95 bool
96 default y
98 config TRACE_IRQFLAGS_SUPPORT
99 bool
100 default y
102 config LOCKDEP_SUPPORT
103 bool
104 default y
106 config RWSEM_GENERIC_SPINLOCK
107 bool
109 config RWSEM_XCHGADD_ALGORITHM
110 bool
111 default y
113 config GENERIC_LOCKBREAK
114 bool
115 default y
116 depends on SMP && PREEMPT
118 config GENERIC_HWEIGHT
119 bool
120 default y
122 config ARCH_HAS_DMA_SET_COHERENT_MASK
123 bool
125 config PPC
126 bool
127 default y
128 #
129 # Please keep this list sorted alphabetically.
130 #
131 select ARCH_HAS_DEVMEM_IS_ALLOWED
132 select ARCH_HAS_DMA_SET_COHERENT_MASK
133 select ARCH_HAS_ELF_RANDOMIZE
134 select ARCH_HAS_FORTIFY_SOURCE
135 select ARCH_HAS_GCOV_PROFILE_ALL
136 select ARCH_HAS_PHYS_TO_DMA
137 select ARCH_HAS_PMEM_API if PPC64
138 select ARCH_HAS_PTE_SPECIAL
139 select ARCH_HAS_MEMBARRIER_CALLBACKS
140 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE
141 select ARCH_HAS_SG_CHAIN
142 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION)
143 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
144 select ARCH_HAS_UACCESS_FLUSHCACHE if PPC64
145 select ARCH_HAS_UBSAN_SANITIZE_ALL
146 select ARCH_HAS_ZONE_DEVICE if PPC_BOOK3S_64
147 select ARCH_HAVE_NMI_SAFE_CMPXCHG
148 select ARCH_MIGHT_HAVE_PC_PARPORT
149 select ARCH_MIGHT_HAVE_PC_SERIO
150 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
151 select ARCH_SUPPORTS_ATOMIC_RMW
152 select ARCH_USE_BUILTIN_BSWAP
153 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
154 select ARCH_WANT_IPC_PARSE_VERSION
155 select ARCH_WEAK_RELEASE_ACQUIRE
156 select BINFMT_ELF
157 select BUILDTIME_EXTABLE_SORT
158 select CLONE_BACKWARDS
159 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
160 select DYNAMIC_FTRACE if FUNCTION_TRACER
161 select EDAC_ATOMIC_SCRUB
162 select EDAC_SUPPORT
163 select GENERIC_ATOMIC64 if PPC32
164 select GENERIC_CLOCKEVENTS
165 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
166 select GENERIC_CMOS_UPDATE
167 select GENERIC_CPU_AUTOPROBE
168 select GENERIC_CPU_VULNERABILITIES if PPC_BOOK3S_64
169 select GENERIC_IRQ_SHOW
170 select GENERIC_IRQ_SHOW_LEVEL
171 select GENERIC_SMP_IDLE_THREAD
172 select GENERIC_STRNCPY_FROM_USER
173 select GENERIC_STRNLEN_USER
174 select GENERIC_TIME_VSYSCALL
175 select HAVE_ARCH_AUDITSYSCALL
176 select HAVE_ARCH_JUMP_LABEL
177 select HAVE_ARCH_KGDB
178 select HAVE_ARCH_MMAP_RND_BITS
179 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
180 select HAVE_ARCH_SECCOMP_FILTER
181 select HAVE_ARCH_TRACEHOOK
182 select HAVE_CBPF_JIT if !PPC64
183 select HAVE_CONTEXT_TRACKING if PPC64
184 select HAVE_DEBUG_KMEMLEAK
185 select HAVE_DEBUG_STACKOVERFLOW
186 select HAVE_DYNAMIC_FTRACE
187 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
188 select HAVE_EBPF_JIT if PPC64
189 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
190 select HAVE_FTRACE_MCOUNT_RECORD
191 select HAVE_FUNCTION_GRAPH_TRACER
192 select HAVE_FUNCTION_TRACER
193 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
194 select HAVE_GENERIC_GUP
195 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
196 select HAVE_IDE
197 select HAVE_IOREMAP_PROT
198 select HAVE_IRQ_EXIT_ON_IRQ_STACK
199 select HAVE_KERNEL_GZIP
200 select HAVE_KPROBES
201 select HAVE_KPROBES_ON_FTRACE
202 select HAVE_KRETPROBES
203 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
204 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
205 select HAVE_MEMBLOCK
206 select HAVE_MEMBLOCK_NODE_MAP
207 select HAVE_MOD_ARCH_SPECIFIC
208 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
209 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
210 select HAVE_OPROFILE
211 select HAVE_OPTPROBES if PPC64
212 select HAVE_PERF_EVENTS
213 select HAVE_PERF_EVENTS_NMI if PPC64
214 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
215 select HAVE_PERF_REGS
216 select HAVE_PERF_USER_STACK_DUMP
217 select HAVE_RCU_TABLE_FREE if SMP
218 select HAVE_REGS_AND_STACK_ACCESS_API
219 select HAVE_RELIABLE_STACKTRACE if PPC64 && CPU_LITTLE_ENDIAN
220 select HAVE_SYSCALL_TRACEPOINTS
221 select HAVE_VIRT_CPU_ACCOUNTING
222 select HAVE_IRQ_TIME_ACCOUNTING
223 select HAVE_RSEQ
224 select IOMMU_HELPER if PPC64
225 select IRQ_DOMAIN
226 select IRQ_FORCED_THREADING
227 select MODULES_USE_ELF_RELA
228 select NEED_SG_DMA_LENGTH
229 select NO_BOOTMEM
230 select OF
231 select OF_EARLY_FLATTREE
232 select OF_RESERVED_MEM
233 select OLD_SIGACTION if PPC32
234 select OLD_SIGSUSPEND
235 select RTC_LIB
236 select SPARSE_IRQ
237 select SYSCTL_EXCEPTION_TRACE
238 select VIRT_TO_BUS if !PPC64
239 #
240 # Please keep this list sorted alphabetically.
241 #
243 config GENERIC_CSUM
244 def_bool n
246 config EARLY_PRINTK
247 bool
248 default y
250 config PANIC_TIMEOUT
251 int
252 default 180
254 config COMPAT
255 bool
256 default y if PPC64
257 select COMPAT_BINFMT_ELF
258 select ARCH_WANT_OLD_COMPAT_IPC
259 select COMPAT_OLD_SIGACTION
261 config SYSVIPC_COMPAT
262 bool
263 depends on COMPAT && SYSVIPC
264 default y
266 # All PPC32s use generic nvram driver through ppc_md
267 config GENERIC_NVRAM
268 bool
269 default y if PPC32
271 config SCHED_OMIT_FRAME_POINTER
272 bool
273 default y
275 config ARCH_MAY_HAVE_PC_FDC
276 bool
277 default PCI
279 config PPC_UDBG_16550
280 bool
281 default n
283 config GENERIC_TBSYNC
284 bool
285 default y if PPC32 && SMP
286 default n
288 config AUDIT_ARCH
289 bool
290 default y
292 config GENERIC_BUG
293 bool
294 default y
295 depends on BUG
297 config SYS_SUPPORTS_APM_EMULATION
298 default y if PMAC_APM_EMU
299 bool
301 config EPAPR_BOOT
302 bool
303 help
304 Used to allow a board to specify it wants an ePAPR compliant wrapper.
305 default n
307 config DEFAULT_UIMAGE
308 bool
309 help
310 Used to allow a board to specify it wants a uImage built by default
311 default n
313 config ARCH_HIBERNATION_POSSIBLE
314 bool
315 default y
317 config ARCH_SUSPEND_POSSIBLE
318 def_bool y
319 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
320 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
321 || 44x || 40x
323 config PPC_DCR_NATIVE
324 bool
325 default n
327 config PPC_DCR_MMIO
328 bool
329 default n
331 config PPC_DCR
332 bool
333 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
334 default y
336 config PPC_OF_PLATFORM_PCI
337 bool
338 depends on PCI
339 depends on PPC64 # not supported on 32 bits yet
340 default n
342 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
343 depends on PPC32 || PPC_BOOK3S_64
344 def_bool y
346 config ARCH_SUPPORTS_UPROBES
347 def_bool y
349 config PPC_ADV_DEBUG_REGS
350 bool
351 depends on 40x || BOOKE
352 default y
354 config PPC_ADV_DEBUG_IACS
355 int
356 depends on PPC_ADV_DEBUG_REGS
357 default 4 if 44x
358 default 2
360 config PPC_ADV_DEBUG_DACS
361 int
362 depends on PPC_ADV_DEBUG_REGS
363 default 2
365 config PPC_ADV_DEBUG_DVCS
366 int
367 depends on PPC_ADV_DEBUG_REGS
368 default 2 if 44x
369 default 0
371 config PPC_ADV_DEBUG_DAC_RANGE
372 bool
373 depends on PPC_ADV_DEBUG_REGS && 44x
374 default y
376 config ZONE_DMA32
377 bool
378 default y if PPC64
380 config PGTABLE_LEVELS
381 int
382 default 2 if !PPC64
383 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
384 default 4
386 source "init/Kconfig"
388 source "kernel/Kconfig.freezer"
390 source "arch/powerpc/sysdev/Kconfig"
391 source "arch/powerpc/platforms/Kconfig"
393 menu "Kernel options"
395 config HIGHMEM
396 bool "High memory support"
397 depends on PPC32
399 source kernel/Kconfig.hz
400 source kernel/Kconfig.preempt
401 source "fs/Kconfig.binfmt"
403 config HUGETLB_PAGE_SIZE_VARIABLE
404 bool
405 depends on HUGETLB_PAGE
406 default y
408 config MATH_EMULATION
409 bool "Math emulation"
410 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
411 ---help---
412 Some PowerPC chips designed for embedded applications do not have
413 a floating-point unit and therefore do not implement the
414 floating-point instructions in the PowerPC instruction set. If you
415 say Y here, the kernel will include code to emulate a floating-point
416 unit, which will allow programs that use floating-point
417 instructions to run.
419 This is also useful to emulate missing (optional) instructions
420 such as fsqrt on cores that do have an FPU but do not implement
421 them (such as Freescale BookE).
423 choice
424 prompt "Math emulation options"
425 default MATH_EMULATION_FULL
426 depends on MATH_EMULATION
428 config MATH_EMULATION_FULL
429 bool "Emulate all the floating point instructions"
430 ---help---
431 Select this option will enable the kernel to support to emulate
432 all the floating point instructions. If your SoC doesn't have
433 a FPU, you should select this.
435 config MATH_EMULATION_HW_UNIMPLEMENTED
436 bool "Just emulate the FPU unimplemented instructions"
437 ---help---
438 Select this if you know there does have a hardware FPU on your
439 SoC, but some floating point instructions are not implemented by that.
441 endchoice
443 config PPC_TRANSACTIONAL_MEM
444 bool "Transactional Memory support for POWERPC"
445 depends on PPC_BOOK3S_64
446 depends on SMP
447 select ALTIVEC
448 select VSX
449 default n
450 ---help---
451 Support user-mode Transactional Memory on POWERPC.
453 config LD_HEAD_STUB_CATCH
454 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
455 depends on PPC64
456 default n
457 help
458 Very large kernels can cause linker branch stubs to be generated by
459 code in head_64.S, which moves the head text sections out of their
460 specified location. This option can work around the problem.
462 If unsure, say "N".
464 config MPROFILE_KERNEL
465 depends on PPC64 && CPU_LITTLE_ENDIAN
466 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
468 config HOTPLUG_CPU
469 bool "Support for enabling/disabling CPUs"
470 depends on SMP && (PPC_PSERIES || \
471 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
472 ---help---
473 Say Y here to be able to disable and re-enable individual
474 CPUs at runtime on SMP machines.
476 Say N if you are unsure.
478 config ARCH_CPU_PROBE_RELEASE
479 def_bool y
480 depends on HOTPLUG_CPU
482 config ARCH_ENABLE_MEMORY_HOTPLUG
483 def_bool y
485 config ARCH_HAS_WALK_MEMORY
486 def_bool y
488 config ARCH_ENABLE_MEMORY_HOTREMOVE
489 def_bool y
491 config PPC64_SUPPORTS_MEMORY_FAILURE
492 bool "Add support for memory hwpoison"
493 depends on PPC_BOOK3S_64
494 default "y" if PPC_POWERNV
495 select ARCH_SUPPORTS_MEMORY_FAILURE
497 config KEXEC
498 bool "kexec system call"
499 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
500 select KEXEC_CORE
501 help
502 kexec is a system call that implements the ability to shutdown your
503 current kernel, and to start another kernel. It is like a reboot
504 but it is independent of the system firmware. And like a reboot
505 you can start any kernel with it, not just Linux.
507 The name comes from the similarity to the exec system call.
509 It is an ongoing process to be certain the hardware in a machine
510 is properly shutdown, so do not be surprised if this code does not
511 initially work for you. As of this writing the exact hardware
512 interface is strongly in flux, so no good recommendation can be
513 made.
515 config KEXEC_FILE
516 bool "kexec file based system call"
517 select KEXEC_CORE
518 select HAVE_IMA_KEXEC
519 select BUILD_BIN2C
520 depends on PPC64
521 depends on CRYPTO=y
522 depends on CRYPTO_SHA256=y
523 help
524 This is a new version of the kexec system call. This call is
525 file based and takes in file descriptors as system call arguments
526 for kernel and initramfs as opposed to a list of segments as is the
527 case for the older kexec call.
529 config ARCH_HAS_KEXEC_PURGATORY
530 def_bool KEXEC_FILE
532 config RELOCATABLE
533 bool "Build a relocatable kernel"
534 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
535 select NONSTATIC_KERNEL
536 select MODULE_REL_CRCS if MODVERSIONS
537 help
538 This builds a kernel image that is capable of running at the
539 location the kernel is loaded at. For ppc32, there is no any
540 alignment restrictions, and this feature is a superset of
541 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
542 16k-aligned base address. The kernel is linked as a
543 position-independent executable (PIE) and contains dynamic relocations
544 which are processed early in the bootup process.
546 One use is for the kexec on panic case where the recovery kernel
547 must live at a different physical address than the primary
548 kernel.
550 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
551 it has been loaded at and the compile time physical addresses
552 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
553 setting can still be useful to bootwrappers that need to know the
554 load address of the kernel (eg. u-boot/mkimage).
556 config RELOCATABLE_TEST
557 bool "Test relocatable kernel"
558 depends on (PPC64 && RELOCATABLE)
559 default n
560 help
561 This runs the relocatable kernel at the address it was initially
562 loaded at, which tends to be non-zero and therefore test the
563 relocation code.
565 config CRASH_DUMP
566 bool "Build a dump capture kernel"
567 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
568 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
569 help
570 Build a kernel suitable for use as a dump capture kernel.
571 The same kernel binary can be used as production kernel and dump
572 capture kernel.
574 config FA_DUMP
575 bool "Firmware-assisted dump"
576 depends on PPC64 && PPC_RTAS
577 select CRASH_CORE
578 select CRASH_DUMP
579 help
580 A robust mechanism to get reliable kernel crash dump with
581 assistance from firmware. This approach does not use kexec,
582 instead firmware assists in booting the capture kernel
583 while preserving memory contents. Firmware-assisted dump
584 is meant to be a kdump replacement offering robustness and
585 speed not possible without system firmware assistance.
587 If unsure, say "N"
589 config IRQ_ALL_CPUS
590 bool "Distribute interrupts on all CPUs by default"
591 depends on SMP
592 help
593 This option gives the kernel permission to distribute IRQs across
594 multiple CPUs. Saying N here will route all IRQs to the first
595 CPU. Generally saying Y is safe, although some problems have been
596 reported with SMP Power Macintoshes with this option enabled.
598 config NUMA
599 bool "NUMA support"
600 depends on PPC64
601 default y if SMP && PPC_PSERIES
603 config NODES_SHIFT
604 int
605 default "8" if PPC64
606 default "4"
607 depends on NEED_MULTIPLE_NODES
609 config USE_PERCPU_NUMA_NODE_ID
610 def_bool y
611 depends on NUMA
613 config HAVE_MEMORYLESS_NODES
614 def_bool y
615 depends on NUMA
617 config ARCH_SELECT_MEMORY_MODEL
618 def_bool y
619 depends on PPC64
621 config ARCH_FLATMEM_ENABLE
622 def_bool y
623 depends on (PPC64 && !NUMA) || PPC32
625 config ARCH_SPARSEMEM_ENABLE
626 def_bool y
627 depends on PPC64
628 select SPARSEMEM_VMEMMAP_ENABLE
630 config ARCH_SPARSEMEM_DEFAULT
631 def_bool y
632 depends on PPC_BOOK3S_64
634 config SYS_SUPPORTS_HUGETLBFS
635 bool
637 config ILLEGAL_POINTER_VALUE
638 hex
639 # This is roughly half way between the top of user space and the bottom
640 # of kernel space, which seems about as good as we can get.
641 default 0x5deadbeef0000000 if PPC64
642 default 0
644 source "mm/Kconfig"
646 config ARCH_MEMORY_PROBE
647 def_bool y
648 depends on MEMORY_HOTPLUG
650 # Some NUMA nodes have memory ranges that span
651 # other nodes. Even though a pfn is valid and
652 # between a node's start and end pfns, it may not
653 # reside on that node. See memmap_init_zone()
654 # for details.
655 config NODES_SPAN_OTHER_NODES
656 def_bool y
657 depends on NEED_MULTIPLE_NODES
659 config STDBINUTILS
660 bool "Using standard binutils settings"
661 depends on 44x
662 default y
663 help
664 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
665 Note, that kernel will be able to run only those applications,
666 which had been compiled using binutils later than 2.17.50.0.3 with
667 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
668 the older binutils, you can patch them with a trivial patch, which
669 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
671 choice
672 prompt "Page size"
673 default PPC_4K_PAGES
674 help
675 Select the kernel logical page size. Increasing the page size
676 will reduce software overhead at each page boundary, allow
677 hardware prefetch mechanisms to be more effective, and allow
678 larger dma transfers increasing IO efficiency and reducing
679 overhead. However the utilization of memory will increase.
680 For example, each cached file will using a multiple of the
681 page size to hold its contents and the difference between the
682 end of file and the end of page is wasted.
684 Some dedicated systems, such as software raid serving with
685 accelerated calculations, have shown significant increases.
687 If you configure a 64 bit kernel for 64k pages but the
688 processor does not support them, then the kernel will simulate
689 them with 4k pages, loading them on demand, but with the
690 reduced software overhead and larger internal fragmentation.
691 For the 32 bit kernel, a large page option will not be offered
692 unless it is supported by the configured processor.
694 If unsure, choose 4K_PAGES.
696 config PPC_4K_PAGES
697 bool "4k page size"
698 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
700 config PPC_16K_PAGES
701 bool "16k page size"
702 depends on 44x || PPC_8xx
704 config PPC_64K_PAGES
705 bool "64k page size"
706 depends on !PPC_FSL_BOOK3E && (44x || PPC_BOOK3S_64 || PPC_BOOK3E_64)
707 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
709 config PPC_256K_PAGES
710 bool "256k page size"
711 depends on 44x && !STDBINUTILS
712 help
713 Make the page size 256k.
715 As the ELF standard only requires alignment to support page
716 sizes up to 64k, you will need to compile all of your user
717 space applications with a non-standard binutils settings
718 (see the STDBINUTILS description for details).
720 Say N unless you know what you are doing.
722 endchoice
724 config THREAD_SHIFT
725 int "Thread shift" if EXPERT
726 range 13 15
727 default "15" if PPC_256K_PAGES
728 default "14" if PPC64
729 default "13"
730 help
731 Used to define the stack size. The default is almost always what you
732 want. Only change this if you know what you are doing.
734 config FORCE_MAX_ZONEORDER
735 int "Maximum zone order"
736 range 8 9 if PPC64 && PPC_64K_PAGES
737 default "9" if PPC64 && PPC_64K_PAGES
738 range 13 13 if PPC64 && !PPC_64K_PAGES
739 default "13" if PPC64 && !PPC_64K_PAGES
740 range 9 64 if PPC32 && PPC_16K_PAGES
741 default "9" if PPC32 && PPC_16K_PAGES
742 range 7 64 if PPC32 && PPC_64K_PAGES
743 default "7" if PPC32 && PPC_64K_PAGES
744 range 5 64 if PPC32 && PPC_256K_PAGES
745 default "5" if PPC32 && PPC_256K_PAGES
746 range 11 64
747 default "11"
748 help
749 The kernel memory allocator divides physically contiguous memory
750 blocks into "zones", where each zone is a power of two number of
751 pages. This option selects the largest power of two that the kernel
752 keeps in the memory allocator. If you need to allocate very large
753 blocks of physically contiguous memory, then you may need to
754 increase this value.
756 This config option is actually maximum order plus one. For example,
757 a value of 11 means that the largest free memory block is 2^10 pages.
759 The page size is not necessarily 4KB. For example, on 64-bit
760 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
761 this in mind when choosing a value for this option.
763 config PPC_SUBPAGE_PROT
764 bool "Support setting protections for 4k subpages"
765 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
766 help
767 This option adds support for a system call to allow user programs
768 to set access permissions (read/write, readonly, or no access)
769 on the 4k subpages of each 64k page.
771 config PPC_COPRO_BASE
772 bool
773 default n
775 config SCHED_SMT
776 bool "SMT (Hyperthreading) scheduler support"
777 depends on PPC64 && SMP
778 help
779 SMT scheduler support improves the CPU scheduler's decision making
780 when dealing with POWER5 cpus at a cost of slightly increased
781 overhead in some places. If unsure say N here.
783 config PPC_DENORMALISATION
784 bool "PowerPC denormalisation exception handling"
785 depends on PPC_BOOK3S_64
786 default "y" if PPC_POWERNV
787 ---help---
788 Add support for handling denormalisation of single precision
789 values. Useful for bare metal only. If unsure say Y here.
791 config CMDLINE_BOOL
792 bool "Default bootloader kernel arguments"
794 config CMDLINE
795 string "Initial kernel command string"
796 depends on CMDLINE_BOOL
797 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
798 help
799 On some platforms, there is currently no way for the boot loader to
800 pass arguments to the kernel. For these platforms, you can supply
801 some command-line options at build time by entering them here. In
802 most cases you will need to specify the root device here.
804 config CMDLINE_FORCE
805 bool "Always use the default kernel command string"
806 depends on CMDLINE_BOOL
807 help
808 Always use the default kernel command string, even if the boot
809 loader passes other arguments to the kernel.
810 This is useful if you cannot or don't want to change the
811 command-line options your boot loader passes to the kernel.
813 config EXTRA_TARGETS
814 string "Additional default image types"
815 help
816 List additional targets to be built by the bootwrapper here (separated
817 by spaces). This is useful for targets that depend of device tree
818 files in the .dts directory.
820 Targets in this list will be build as part of the default build
821 target, or when the user does a 'make zImage' or a
822 'make zImage.initrd'.
824 If unsure, leave blank
826 config ARCH_WANTS_FREEZER_CONTROL
827 def_bool y
828 depends on ADB_PMU
830 source kernel/power/Kconfig
832 config SECCOMP
833 bool "Enable seccomp to safely compute untrusted bytecode"
834 depends on PROC_FS
835 default y
836 help
837 This kernel feature is useful for number crunching applications
838 that may need to compute untrusted bytecode during their
839 execution. By using pipes or other transports made available to
840 the process as file descriptors supporting the read/write
841 syscalls, it's possible to isolate those applications in
842 their own address space using seccomp. Once seccomp is
843 enabled via /proc/<pid>/seccomp, it cannot be disabled
844 and the task is only allowed to execute a few safe syscalls
845 defined by each seccomp mode.
847 If unsure, say Y. Only embedded should say N here.
849 config PPC_MEM_KEYS
850 prompt "PowerPC Memory Protection Keys"
851 def_bool y
852 depends on PPC_BOOK3S_64
853 select ARCH_USES_HIGH_VMA_FLAGS
854 select ARCH_HAS_PKEYS
855 help
856 Memory Protection Keys provides a mechanism for enforcing
857 page-based protections, but without requiring modification of the
858 page tables when an application changes protection domains.
860 For details, see Documentation/vm/protection-keys.rst
862 If unsure, say y.
864 endmenu
866 config ISA_DMA_API
867 bool
868 default PCI
870 menu "Bus options"
872 config ISA
873 bool "Support for ISA-bus hardware"
874 depends on PPC_CHRP
875 select PPC_I8259
876 help
877 Find out whether you have ISA slots on your motherboard. ISA is the
878 name of a bus system, i.e. the way the CPU talks to the other stuff
879 inside your box. If you have an Apple machine, say N here; if you
880 have an IBM RS/6000 or pSeries machine, say Y. If you have an
881 embedded board, consult your board documentation.
883 config ZONE_DMA
884 bool
885 default y
887 config NEED_DMA_MAP_STATE
888 def_bool (PPC64 || NOT_COHERENT_CACHE)
890 config GENERIC_ISA_DMA
891 bool
892 depends on ISA_DMA_API
893 default y
895 config PPC_INDIRECT_PCI
896 bool
897 depends on PCI
898 default y if 40x || 44x
899 default n
901 config EISA
902 bool
904 config SBUS
905 bool
907 config FSL_SOC
908 bool
910 config FSL_PCI
911 bool
912 select PPC_INDIRECT_PCI
913 select PCI_QUIRKS
915 config FSL_PMC
916 bool
917 default y
918 depends on SUSPEND && (PPC_85xx || PPC_86xx)
919 help
920 Freescale MPC85xx/MPC86xx power management controller support
921 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
923 config PPC4xx_CPM
924 bool
925 default y
926 depends on SUSPEND && (44x || 40x)
927 help
928 PPC4xx Clock Power Management (CPM) support (suspend/resume).
929 It also enables support for two different idle states (idle-wait
930 and idle-doze).
932 config 4xx_SOC
933 bool
935 config FSL_LBC
936 bool "Freescale Local Bus support"
937 help
938 Enables reporting of errors from the Freescale local bus
939 controller. Also contains some common code used by
940 drivers for specific local bus peripherals.
942 config FSL_GTM
943 bool
944 depends on PPC_83xx || QUICC_ENGINE || CPM2
945 help
946 Freescale General-purpose Timers support
948 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
949 config MCA
950 bool
952 # Platforms that what PCI turned unconditionally just do select PCI
953 # in their config node. Platforms that want to choose at config
954 # time should select PPC_PCI_CHOICE
955 config PPC_PCI_CHOICE
956 bool
958 config PCI
959 bool "PCI support" if PPC_PCI_CHOICE
960 default y if !40x && !CPM2 && !PPC_8xx && !PPC_83xx \
961 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
962 default PCI_QSPAN if PPC_8xx
963 select GENERIC_PCI_IOMAP
964 help
965 Find out whether your system includes a PCI bus. PCI is the name of
966 a bus system, i.e. the way the CPU talks to the other stuff inside
967 your box. If you say Y here, the kernel will include drivers and
968 infrastructure code to support PCI bus devices.
970 config PCI_DOMAINS
971 def_bool PCI
973 config PCI_SYSCALL
974 def_bool PCI
976 config PCI_QSPAN
977 bool "QSpan PCI"
978 depends on PPC_8xx
979 select PPC_I8259
980 help
981 Say Y here if you have a system based on a Motorola 8xx-series
982 embedded processor with a QSPAN PCI interface, otherwise say N.
984 config PCI_8260
985 bool
986 depends on PCI && 8260
987 select PPC_INDIRECT_PCI
988 default y
990 source "drivers/pci/Kconfig"
992 source "drivers/pcmcia/Kconfig"
994 config HAS_RAPIDIO
995 bool
996 default n
998 config RAPIDIO
999 tristate "RapidIO support"
1000 depends on HAS_RAPIDIO || PCI
1001 help
1002 If you say Y here, the kernel will include drivers and
1003 infrastructure code to support RapidIO interconnect devices.
1005 config FSL_RIO
1006 bool "Freescale Embedded SRIO Controller support"
1007 depends on RAPIDIO = y && HAS_RAPIDIO
1008 default "n"
1009 ---help---
1010 Include support for RapidIO controller on Freescale embedded
1011 processors (MPC8548, MPC8641, etc).
1013 source "drivers/rapidio/Kconfig"
1015 endmenu
1017 config NONSTATIC_KERNEL
1018 bool
1019 default n
1021 menu "Advanced setup"
1022 depends on PPC32
1024 config ADVANCED_OPTIONS
1025 bool "Prompt for advanced kernel configuration options"
1026 help
1027 This option will enable prompting for a variety of advanced kernel
1028 configuration options. These options can cause the kernel to not
1029 work if they are set incorrectly, but can be used to optimize certain
1030 aspects of kernel memory management.
1032 Unless you know what you are doing, say N here.
1034 comment "Default settings for advanced configuration options are used"
1035 depends on !ADVANCED_OPTIONS
1037 config LOWMEM_SIZE_BOOL
1038 bool "Set maximum low memory"
1039 depends on ADVANCED_OPTIONS
1040 help
1041 This option allows you to set the maximum amount of memory which
1042 will be used as "low memory", that is, memory which the kernel can
1043 access directly, without having to set up a kernel virtual mapping.
1044 This can be useful in optimizing the layout of kernel virtual
1045 memory.
1047 Say N here unless you know what you are doing.
1049 config LOWMEM_SIZE
1050 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1051 default "0x30000000"
1053 config LOWMEM_CAM_NUM_BOOL
1054 bool "Set number of CAMs to use to map low memory"
1055 depends on ADVANCED_OPTIONS && FSL_BOOKE
1056 help
1057 This option allows you to set the maximum number of CAM slots that
1058 will be used to map low memory. There are a limited number of slots
1059 available and even more limited number that will fit in the L1 MMU.
1060 However, using more entries will allow mapping more low memory. This
1061 can be useful in optimizing the layout of kernel virtual memory.
1063 Say N here unless you know what you are doing.
1065 config LOWMEM_CAM_NUM
1066 depends on FSL_BOOKE
1067 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1068 default 3
1070 config DYNAMIC_MEMSTART
1071 bool "Enable page aligned dynamic load address for kernel"
1072 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1073 select NONSTATIC_KERNEL
1074 help
1075 This option enables the kernel to be loaded at any page aligned
1076 physical address. The kernel creates a mapping from KERNELBASE to
1077 the address where the kernel is loaded. The page size here implies
1078 the TLB page size of the mapping for kernel on the particular platform.
1079 Please refer to the init code for finding the TLB page size.
1081 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1082 kernel image, where the only restriction is the page aligned kernel
1083 load address. When this option is enabled, the compile time physical
1084 address CONFIG_PHYSICAL_START is ignored.
1086 This option is overridden by CONFIG_RELOCATABLE
1088 config PAGE_OFFSET_BOOL
1089 bool "Set custom page offset address"
1090 depends on ADVANCED_OPTIONS
1091 help
1092 This option allows you to set the kernel virtual address at which
1093 the kernel will map low memory. This can be useful in optimizing
1094 the virtual memory layout of the system.
1096 Say N here unless you know what you are doing.
1098 config PAGE_OFFSET
1099 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1100 default "0xc0000000"
1102 config KERNEL_START_BOOL
1103 bool "Set custom kernel base address"
1104 depends on ADVANCED_OPTIONS
1105 help
1106 This option allows you to set the kernel virtual address at which
1107 the kernel will be loaded. Normally this should match PAGE_OFFSET
1108 however there are times (like kdump) that one might not want them
1109 to be the same.
1111 Say N here unless you know what you are doing.
1113 config KERNEL_START
1114 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1115 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1116 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1117 default "0xc0000000"
1119 config PHYSICAL_START_BOOL
1120 bool "Set physical address where the kernel is loaded"
1121 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1122 help
1123 This gives the physical address where the kernel is loaded.
1125 Say N here unless you know what you are doing.
1127 config PHYSICAL_START
1128 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1129 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1130 default "0x00000000"
1132 config PHYSICAL_ALIGN
1133 hex
1134 default "0x04000000" if FSL_BOOKE
1135 help
1136 This value puts the alignment restrictions on physical address
1137 where kernel is loaded and run from. Kernel is compiled for an
1138 address which meets above alignment restriction.
1140 config TASK_SIZE_BOOL
1141 bool "Set custom user task size"
1142 depends on ADVANCED_OPTIONS
1143 help
1144 This option allows you to set the amount of virtual address space
1145 allocated to user tasks. This can be useful in optimizing the
1146 virtual memory layout of the system.
1148 Say N here unless you know what you are doing.
1150 config TASK_SIZE
1151 hex "Size of user task space" if TASK_SIZE_BOOL
1152 default "0x80000000" if PPC_8xx
1153 default "0xc0000000"
1155 config CONSISTENT_SIZE_BOOL
1156 bool "Set custom consistent memory pool size"
1157 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1158 help
1159 This option allows you to set the size of the
1160 consistent memory pool. This pool of virtual memory
1161 is used to make consistent memory allocations.
1163 config CONSISTENT_SIZE
1164 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1165 default "0x00200000" if NOT_COHERENT_CACHE
1167 config PIN_TLB
1168 bool "Pinned Kernel TLBs (860 ONLY)"
1169 depends on ADVANCED_OPTIONS && PPC_8xx && \
1170 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1172 config PIN_TLB_DATA
1173 bool "Pinned TLB for DATA"
1174 depends on PIN_TLB
1175 default y
1177 config PIN_TLB_IMMR
1178 bool "Pinned TLB for IMMR"
1179 depends on PIN_TLB
1180 default y
1182 config PIN_TLB_TEXT
1183 bool "Pinned TLB for TEXT"
1184 depends on PIN_TLB
1185 default y
1186 endmenu
1188 if PPC64
1189 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1190 config PAGE_OFFSET
1191 hex
1192 default "0xc000000000000000"
1193 config KERNEL_START
1194 hex
1195 default "0xc000000000000000"
1196 config PHYSICAL_START
1197 hex
1198 default "0x00000000"
1199 endif
1201 config ARCH_RANDOM
1202 def_bool n
1204 source "net/Kconfig"
1206 source "drivers/Kconfig"
1208 source "fs/Kconfig"
1210 source "lib/Kconfig"
1212 source "arch/powerpc/Kconfig.debug"
1214 source "security/Kconfig"
1216 source "crypto/Kconfig"
1218 config PPC_LIB_RHEAP
1219 bool
1221 source "arch/powerpc/kvm/Kconfig"
1223 source "kernel/livepatch/Kconfig"