xref: /openbmc/linux/arch/powerpc/Kconfig (revision f42b3800) 
1# For a description of the syntax of this configuration file,
2# see Documentation/kbuild/kconfig-language.txt.
3#
4
5mainmenu "Linux/PowerPC Kernel Configuration"
6
7source "arch/powerpc/platforms/Kconfig.cputype"
8
9config PPC32
10	bool
11	default y if !PPC64
12
13config 64BIT
14	bool
15	default y if PPC64
16
17config WORD_SIZE
18	int
19	default 64 if PPC64
20	default 32 if !PPC64
21
22config PPC_MERGE
23	def_bool y
24
25config MMU
26	bool
27	default y
28
29config GENERIC_CMOS_UPDATE
30	def_bool y
31
32config GENERIC_TIME
33	def_bool y
34
35config GENERIC_TIME_VSYSCALL
36	def_bool y
37
38config GENERIC_CLOCKEVENTS
39	def_bool y
40
41config GENERIC_HARDIRQS
42	bool
43	default y
44
45config HAVE_SETUP_PER_CPU_AREA
46	def_bool PPC64
47
48config IRQ_PER_CPU
49	bool
50	default y
51
52config RWSEM_GENERIC_SPINLOCK
53	bool
54
55config RWSEM_XCHGADD_ALGORITHM
56	bool
57	default y
58
59config GENERIC_LOCKBREAK
60	bool
61	default y
62	depends on SMP && PREEMPT
63
64config ARCH_HAS_ILOG2_U32
65	bool
66	default y
67
68config ARCH_HAS_ILOG2_U64
69	bool
70	default y if 64BIT
71
72config GENERIC_HWEIGHT
73	bool
74	default y
75
76config GENERIC_CALIBRATE_DELAY
77	bool
78	default y
79
80config GENERIC_FIND_NEXT_BIT
81	bool
82	default y
83
84config ARCH_NO_VIRT_TO_BUS
85	def_bool PPC64
86
87config PPC
88	bool
89	default y
90	select HAVE_IDE
91	select HAVE_OPROFILE
92	select HAVE_KPROBES
93	select HAVE_KRETPROBES
94
95config EARLY_PRINTK
96	bool
97	default y
98
99config COMPAT
100	bool
101	default y if PPC64
102	select COMPAT_BINFMT_ELF
103
104config SYSVIPC_COMPAT
105	bool
106	depends on COMPAT && SYSVIPC
107	default y
108
109# All PPC32s use generic nvram driver through ppc_md
110config GENERIC_NVRAM
111	bool
112	default y if PPC32
113
114config SCHED_NO_NO_OMIT_FRAME_POINTER
115	bool
116	default y
117
118config ARCH_MAY_HAVE_PC_FDC
119	bool
120	default !PPC_PSERIES || PCI
121
122config PPC_OF
123	def_bool y
124
125config OF
126	def_bool y
127
128config PPC_UDBG_16550
129	bool
130	default n
131
132config GENERIC_TBSYNC
133	bool
134	default y if PPC32 && SMP
135	default n
136
137config AUDIT_ARCH
138	bool
139	default y
140
141config GENERIC_BUG
142	bool
143	default y
144	depends on BUG
145
146config SYS_SUPPORTS_APM_EMULATION
147	default y if PMAC_APM_EMU
148	bool
149
150config DEFAULT_UIMAGE
151	bool
152	help
153	  Used to allow a board to specify it wants a uImage built by default
154	default n
155
156config REDBOOT
157	bool
158
159config HIBERNATE_32
160	bool
161	depends on (PPC_PMAC && !SMP) || BROKEN
162	default y
163
164config HIBERNATE_64
165	bool
166	depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
167	default y
168
169config ARCH_HIBERNATION_POSSIBLE
170	bool
171	depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
172	default y
173
174config ARCH_SUSPEND_POSSIBLE
175	def_bool y
176	depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200
177
178config PPC_DCR_NATIVE
179	bool
180	default n
181
182config PPC_DCR_MMIO
183	bool
184	default n
185
186config PPC_DCR
187	bool
188	depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
189	default y
190
191config PPC_OF_PLATFORM_PCI
192	bool
193	depends on PCI
194	depends on PPC64 # not supported on 32 bits yet
195	default n
196
197source "init/Kconfig"
198
199source "arch/powerpc/sysdev/Kconfig"
200source "arch/powerpc/platforms/Kconfig"
201
202menu "Kernel options"
203
204config HIGHMEM
205	bool "High memory support"
206	depends on PPC32
207
208source kernel/time/Kconfig
209source kernel/Kconfig.hz
210source kernel/Kconfig.preempt
211source "fs/Kconfig.binfmt"
212
213# We optimistically allocate largepages from the VM, so make the limit
214# large enough (16MB). This badly named config option is actually
215# max order + 1
216config FORCE_MAX_ZONEORDER
217	int
218	depends on PPC64
219	default "9" if PPC_64K_PAGES
220	default "13"
221
222config HUGETLB_PAGE_SIZE_VARIABLE
223	bool
224	depends on HUGETLB_PAGE
225	default y
226
227config MATH_EMULATION
228	bool "Math emulation"
229	depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
230	---help---
231	  Some PowerPC chips designed for embedded applications do not have
232	  a floating-point unit and therefore do not implement the
233	  floating-point instructions in the PowerPC instruction set.  If you
234	  say Y here, the kernel will include code to emulate a floating-point
235	  unit, which will allow programs that use floating-point
236	  instructions to run.
237
238config 8XX_MINIMAL_FPEMU
239	bool "Minimal math emulation for 8xx"
240	depends on 8xx && !MATH_EMULATION
241	help
242	  Older arch/ppc kernels still emulated a few floating point
243	  instructions such as load and store, even when full math
244	  emulation is disabled.  Say "Y" here if you want to preserve
245	  this behavior.
246
247	  It is recommended that you build a soft-float userspace instead.
248
249config IOMMU_VMERGE
250	bool "Enable IOMMU virtual merging"
251	depends on PPC64
252	default y
253	help
254	  Cause IO segments sent to a device for DMA to be merged virtually
255	  by the IOMMU when they happen to have been allocated contiguously.
256	  This doesn't add pressure to the IOMMU allocator. However, some
257	  drivers don't support getting large merged segments coming back
258	  from *_map_sg().
259
260	  Most drivers don't have this problem; it is safe to say Y here.
261
262config IOMMU_HELPER
263	def_bool PPC64
264
265config HOTPLUG_CPU
266	bool "Support for enabling/disabling CPUs"
267	depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
268	---help---
269	  Say Y here to be able to disable and re-enable individual
270	  CPUs at runtime on SMP machines.
271
272	  Say N if you are unsure.
273
274config ARCH_ENABLE_MEMORY_HOTPLUG
275	def_bool y
276
277config ARCH_HAS_WALK_MEMORY
278	def_bool y
279
280config ARCH_ENABLE_MEMORY_HOTREMOVE
281	def_bool y
282
283config KEXEC
284	bool "kexec system call (EXPERIMENTAL)"
285	depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
286	help
287	  kexec is a system call that implements the ability to shutdown your
288	  current kernel, and to start another kernel.  It is like a reboot
289	  but it is independent of the system firmware.   And like a reboot
290	  you can start any kernel with it, not just Linux.
291
292	  The name comes from the similarity to the exec system call.
293
294	  It is an ongoing process to be certain the hardware in a machine
295	  is properly shutdown, so do not be surprised if this code does not
296	  initially work for you.  It may help to enable device hotplugging
297	  support.  As of this writing the exact hardware interface is
298	  strongly in flux, so no good recommendation can be made.
299
300config CRASH_DUMP
301	bool "Build a kdump crash kernel (EXPERIMENTAL)"
302	depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
303	help
304	  Build a kernel suitable for use as a kdump capture kernel.
305	  The kernel will be linked at a different address than normal, and
306	  so can only be used for Kdump.
307
308	  Don't change this unless you know what you are doing.
309
310config PPCBUG_NVRAM
311	bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
312	default y if PPC_PREP
313
314config IRQ_ALL_CPUS
315	bool "Distribute interrupts on all CPUs by default"
316	depends on SMP && !MV64360
317	help
318	  This option gives the kernel permission to distribute IRQs across
319	  multiple CPUs.  Saying N here will route all IRQs to the first
320	  CPU.  Generally saying Y is safe, although some problems have been
321	  reported with SMP Power Macintoshes with this option enabled.
322
323config NUMA
324	bool "NUMA support"
325	depends on PPC64
326	default y if SMP && PPC_PSERIES
327
328config NODES_SHIFT
329	int
330	default "4"
331	depends on NEED_MULTIPLE_NODES
332
333config ARCH_SELECT_MEMORY_MODEL
334	def_bool y
335	depends on PPC64
336
337config ARCH_FLATMEM_ENABLE
338	def_bool y
339	depends on (PPC64 && !NUMA) || PPC32
340
341config ARCH_SPARSEMEM_ENABLE
342	def_bool y
343	depends on PPC64
344	select SPARSEMEM_VMEMMAP_ENABLE
345
346config ARCH_SPARSEMEM_DEFAULT
347	def_bool y
348	depends on (SMP && PPC_PSERIES) || PPC_PS3
349
350config ARCH_POPULATES_NODE_MAP
351	def_bool y
352
353source "mm/Kconfig"
354
355config ARCH_MEMORY_PROBE
356	def_bool y
357	depends on MEMORY_HOTPLUG
358
359# Some NUMA nodes have memory ranges that span
360# other nodes.  Even though a pfn is valid and
361# between a node's start and end pfns, it may not
362# reside on that node.  See memmap_init_zone()
363# for details.
364config NODES_SPAN_OTHER_NODES
365	def_bool y
366	depends on NEED_MULTIPLE_NODES
367
368config PPC_HAS_HASH_64K
369	bool
370	depends on PPC64
371	default n
372
373config PPC_64K_PAGES
374	bool "64k page size"
375	depends on PPC64
376	select PPC_HAS_HASH_64K
377	help
378	  This option changes the kernel logical page size to 64k. On machines
379	  without processor support for 64k pages, the kernel will simulate
380	  them by loading each individual 4k page on demand transparently,
381	  while on hardware with such support, it will be used to map
382	  normal application pages.
383
384config PPC_SUBPAGE_PROT
385	bool "Support setting protections for 4k subpages"
386	depends on PPC_64K_PAGES
387	help
388	  This option adds support for a system call to allow user programs
389	  to set access permissions (read/write, readonly, or no access)
390	  on the 4k subpages of each 64k page.
391
392config SCHED_SMT
393	bool "SMT (Hyperthreading) scheduler support"
394	depends on PPC64 && SMP
395	help
396	  SMT scheduler support improves the CPU scheduler's decision making
397	  when dealing with POWER5 cpus at a cost of slightly increased
398	  overhead in some places. If unsure say N here.
399
400config PROC_DEVICETREE
401	bool "Support for device tree in /proc"
402	depends on PROC_FS
403	help
404	  This option adds a device-tree directory under /proc which contains
405	  an image of the device tree that the kernel copies from Open
406	  Firmware or other boot firmware. If unsure, say Y here.
407
408config CMDLINE_BOOL
409	bool "Default bootloader kernel arguments"
410
411config CMDLINE
412	string "Initial kernel command string"
413	depends on CMDLINE_BOOL
414	default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
415	help
416	  On some platforms, there is currently no way for the boot loader to
417	  pass arguments to the kernel. For these platforms, you can supply
418	  some command-line options at build time by entering them here.  In
419	  most cases you will need to specify the root device here.
420
421if !44x || BROKEN
422config ARCH_WANTS_FREEZER_CONTROL
423	def_bool y
424	depends on ADB_PMU
425
426source kernel/power/Kconfig
427endif
428
429config SECCOMP
430	bool "Enable seccomp to safely compute untrusted bytecode"
431	depends on PROC_FS
432	default y
433	help
434	  This kernel feature is useful for number crunching applications
435	  that may need to compute untrusted bytecode during their
436	  execution. By using pipes or other transports made available to
437	  the process as file descriptors supporting the read/write
438	  syscalls, it's possible to isolate those applications in
439	  their own address space using seccomp. Once seccomp is
440	  enabled via /proc/<pid>/seccomp, it cannot be disabled
441	  and the task is only allowed to execute a few safe syscalls
442	  defined by each seccomp mode.
443
444	  If unsure, say Y. Only embedded should say N here.
445
446endmenu
447
448config ISA_DMA_API
449	bool
450	default !PPC_ISERIES || PCI
451
452menu "Bus options"
453
454config ISA
455	bool "Support for ISA-bus hardware"
456	depends on PPC_PREP || PPC_CHRP
457	select PPC_I8259
458	help
459	  Find out whether you have ISA slots on your motherboard.  ISA is the
460	  name of a bus system, i.e. the way the CPU talks to the other stuff
461	  inside your box.  If you have an Apple machine, say N here; if you
462	  have an IBM RS/6000 or pSeries machine or a PReP machine, say Y.  If
463	  you have an embedded board, consult your board documentation.
464
465config ZONE_DMA
466	bool
467	default y
468
469config GENERIC_ISA_DMA
470	bool
471	depends on PPC64 || POWER4 || 6xx && !CPM2
472	default y
473
474config PPC_INDIRECT_PCI
475	bool
476	depends on PCI
477	default y if 40x || 44x
478	default n
479
480config EISA
481	bool
482
483config SBUS
484	bool
485
486config FSL_SOC
487	bool
488
489config FSL_PCI
490 	bool
491	select PPC_INDIRECT_PCI
492
493# Yes MCA RS/6000s exist but Linux-PPC does not currently support any
494config MCA
495	bool
496
497config PCI
498	bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
499		|| PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
500		|| PPC_PS3 || 44x
501	default y if !40x && !CPM2 && !8xx && !PPC_MPC512x && !PPC_83xx \
502		&& !PPC_85xx && !PPC_86xx
503	default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
504	default PCI_QSPAN if !4xx && !CPM2 && 8xx
505	select ARCH_SUPPORTS_MSI
506	help
507	  Find out whether your system includes a PCI bus. PCI is the name of
508	  a bus system, i.e. the way the CPU talks to the other stuff inside
509	  your box.  If you say Y here, the kernel will include drivers and
510	  infrastructure code to support PCI bus devices.
511
512config PCI_DOMAINS
513	def_bool PCI
514
515config PCI_SYSCALL
516	def_bool PCI
517
518config PCI_QSPAN
519	bool "QSpan PCI"
520	depends on !4xx && !CPM2 && 8xx
521	select PPC_I8259
522	help
523	  Say Y here if you have a system based on a Motorola 8xx-series
524	  embedded processor with a QSPAN PCI interface, otherwise say N.
525
526config PCI_8260
527	bool
528	depends on PCI && 8260
529	select PPC_INDIRECT_PCI
530	default y
531
532config 8260_PCI9
533	bool "Enable workaround for MPC826x erratum PCI 9"
534	depends on PCI_8260 && !8272
535	default y
536
537choice
538	prompt "IDMA channel for PCI 9 workaround"
539	depends on 8260_PCI9
540
541config 8260_PCI9_IDMA1
542	bool "IDMA1"
543
544config 8260_PCI9_IDMA2
545	bool "IDMA2"
546
547config 8260_PCI9_IDMA3
548	bool "IDMA3"
549
550config 8260_PCI9_IDMA4
551	bool "IDMA4"
552
553endchoice
554
555source "drivers/pci/pcie/Kconfig"
556
557source "drivers/pci/Kconfig"
558
559source "drivers/pcmcia/Kconfig"
560
561source "drivers/pci/hotplug/Kconfig"
562
563endmenu
564
565menu "Advanced setup"
566	depends on PPC32
567
568config ADVANCED_OPTIONS
569	bool "Prompt for advanced kernel configuration options"
570	help
571	  This option will enable prompting for a variety of advanced kernel
572	  configuration options.  These options can cause the kernel to not
573	  work if they are set incorrectly, but can be used to optimize certain
574	  aspects of kernel memory management.
575
576	  Unless you know what you are doing, say N here.
577
578comment "Default settings for advanced configuration options are used"
579	depends on !ADVANCED_OPTIONS
580
581config HIGHMEM_START_BOOL
582	bool "Set high memory pool address"
583	depends on ADVANCED_OPTIONS && HIGHMEM
584	help
585	  This option allows you to set the base address of the kernel virtual
586	  area used to map high memory pages.  This can be useful in
587	  optimizing the layout of kernel virtual memory.
588
589	  Say N here unless you know what you are doing.
590
591config HIGHMEM_START
592	hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
593	default "0xfe000000"
594
595config LOWMEM_SIZE_BOOL
596	bool "Set maximum low memory"
597	depends on ADVANCED_OPTIONS
598	help
599	  This option allows you to set the maximum amount of memory which
600	  will be used as "low memory", that is, memory which the kernel can
601	  access directly, without having to set up a kernel virtual mapping.
602	  This can be useful in optimizing the layout of kernel virtual
603	  memory.
604
605	  Say N here unless you know what you are doing.
606
607config LOWMEM_SIZE
608	hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
609	default "0x30000000"
610
611config KERNEL_START_BOOL
612	bool "Set custom kernel base address"
613	depends on ADVANCED_OPTIONS
614	help
615	  This option allows you to set the kernel virtual address at which
616	  the kernel will map low memory (the kernel image will be linked at
617	  this address).  This can be useful in optimizing the virtual memory
618	  layout of the system.
619
620	  Say N here unless you know what you are doing.
621
622config KERNEL_START
623	hex "Virtual address of kernel base" if KERNEL_START_BOOL
624	default "0xc0000000"
625
626config TASK_SIZE_BOOL
627	bool "Set custom user task size"
628	depends on ADVANCED_OPTIONS
629	help
630	  This option allows you to set the amount of virtual address space
631	  allocated to user tasks.  This can be useful in optimizing the
632	  virtual memory layout of the system.
633
634	  Say N here unless you know what you are doing.
635
636config TASK_SIZE
637	hex "Size of user task space" if TASK_SIZE_BOOL
638	default "0x80000000" if PPC_PREP || PPC_8xx
639	default "0xc0000000"
640
641config CONSISTENT_START_BOOL
642	bool "Set custom consistent memory pool address"
643	depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
644	help
645	  This option allows you to set the base virtual address
646	  of the consistent memory pool.  This pool of virtual
647	  memory is used to make consistent memory allocations.
648
649config CONSISTENT_START
650	hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
651	default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
652	default "0xff100000" if NOT_COHERENT_CACHE
653
654config CONSISTENT_SIZE_BOOL
655	bool "Set custom consistent memory pool size"
656	depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
657	help
658	  This option allows you to set the size of the
659	  consistent memory pool.  This pool of virtual memory
660	  is used to make consistent memory allocations.
661
662config CONSISTENT_SIZE
663	hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
664	default "0x00200000" if NOT_COHERENT_CACHE
665
666config BOOT_LOAD_BOOL
667	bool "Set the boot link/load address"
668	depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
669	help
670	  This option allows you to set the initial load address of the zImage
671	  or zImage.initrd file.  This can be useful if you are on a board
672	  which has a small amount of memory.
673
674	  Say N here unless you know what you are doing.
675
676config BOOT_LOAD
677	hex "Link/load address for booting" if BOOT_LOAD_BOOL
678	default "0x00400000" if 40x || 8xx || 8260
679	default "0x01000000" if 44x
680	default "0x00800000"
681
682config PIN_TLB
683	bool "Pinned Kernel TLBs (860 ONLY)"
684	depends on ADVANCED_OPTIONS && 8xx
685endmenu
686
687if PPC64
688config KERNEL_START
689	hex
690	default "0xc000000000000000"
691endif
692
693source "net/Kconfig"
694
695source "drivers/Kconfig"
696
697source "fs/Kconfig"
698
699# XXX source "arch/ppc/8xx_io/Kconfig"
700
701# XXX source "arch/ppc/8260_io/Kconfig"
702
703source "arch/powerpc/sysdev/qe_lib/Kconfig"
704
705source "lib/Kconfig"
706
707source "arch/powerpc/Kconfig.debug"
708
709source "security/Kconfig"
710
711config KEYS_COMPAT
712	bool
713	depends on COMPAT && KEYS
714	default y
715
716source "crypto/Kconfig"
717
718config PPC_CLOCK
719	bool
720	default n
721
722config PPC_LIB_RHEAP
723	bool
724
725