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_BARRIER_NOSPEC
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_KERNEL_XZ if PPC_BOOK3S
201 select HAVE_KPROBES
202 select HAVE_KPROBES_ON_FTRACE
203 select HAVE_KRETPROBES
204 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
205 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
206 select HAVE_MEMBLOCK
207 select HAVE_MEMBLOCK_NODE_MAP
208 select HAVE_MOD_ARCH_SPECIFIC
209 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
210 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
211 select HAVE_OPROFILE
212 select HAVE_OPTPROBES if PPC64
213 select HAVE_PERF_EVENTS
214 select HAVE_PERF_EVENTS_NMI if PPC64
215 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
216 select HAVE_PERF_REGS
217 select HAVE_PERF_USER_STACK_DUMP
218 select HAVE_RCU_TABLE_FREE if SMP
219 select HAVE_REGS_AND_STACK_ACCESS_API
220 select HAVE_RELIABLE_STACKTRACE if PPC64 && CPU_LITTLE_ENDIAN
221 select HAVE_SYSCALL_TRACEPOINTS
222 select HAVE_VIRT_CPU_ACCOUNTING
223 select HAVE_IRQ_TIME_ACCOUNTING
224 select HAVE_RSEQ
225 select IOMMU_HELPER if PPC64
226 select IRQ_DOMAIN
227 select IRQ_FORCED_THREADING
228 select MODULES_USE_ELF_RELA
229 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
230 select NEED_SG_DMA_LENGTH
231 select NO_BOOTMEM
232 select OF
233 select OF_EARLY_FLATTREE
234 select OF_RESERVED_MEM
235 select OLD_SIGACTION if PPC32
236 select OLD_SIGSUSPEND
237 select RTC_LIB
238 select SPARSE_IRQ
239 select SYSCTL_EXCEPTION_TRACE
240 select VIRT_TO_BUS if !PPC64
241 #
242 # Please keep this list sorted alphabetically.
243 #
245 config PPC_BARRIER_NOSPEC
246 bool
247 default y
248 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
250 config GENERIC_CSUM
251 def_bool n
253 config EARLY_PRINTK
254 bool
255 default y
257 config PANIC_TIMEOUT
258 int
259 default 180
261 config COMPAT
262 bool
263 default y if PPC64
264 select COMPAT_BINFMT_ELF
265 select ARCH_WANT_OLD_COMPAT_IPC
266 select COMPAT_OLD_SIGACTION
268 config SYSVIPC_COMPAT
269 bool
270 depends on COMPAT && SYSVIPC
271 default y
273 # All PPC32s use generic nvram driver through ppc_md
274 config GENERIC_NVRAM
275 bool
276 default y if PPC32
278 config SCHED_OMIT_FRAME_POINTER
279 bool
280 default y
282 config ARCH_MAY_HAVE_PC_FDC
283 bool
284 default PCI
286 config PPC_UDBG_16550
287 bool
288 default n
290 config GENERIC_TBSYNC
291 bool
292 default y if PPC32 && SMP
293 default n
295 config AUDIT_ARCH
296 bool
297 default y
299 config GENERIC_BUG
300 bool
301 default y
302 depends on BUG
304 config SYS_SUPPORTS_APM_EMULATION
305 default y if PMAC_APM_EMU
306 bool
308 config EPAPR_BOOT
309 bool
310 help
311 Used to allow a board to specify it wants an ePAPR compliant wrapper.
312 default n
314 config DEFAULT_UIMAGE
315 bool
316 help
317 Used to allow a board to specify it wants a uImage built by default
318 default n
320 config ARCH_HIBERNATION_POSSIBLE
321 bool
322 default y
324 config ARCH_SUSPEND_POSSIBLE
325 def_bool y
326 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
327 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
328 || 44x || 40x
330 config PPC_DCR_NATIVE
331 bool
332 default n
334 config PPC_DCR_MMIO
335 bool
336 default n
338 config PPC_DCR
339 bool
340 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
341 default y
343 config PPC_OF_PLATFORM_PCI
344 bool
345 depends on PCI
346 depends on PPC64 # not supported on 32 bits yet
347 default n
349 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
350 depends on PPC32 || PPC_BOOK3S_64
351 def_bool y
353 config ARCH_SUPPORTS_UPROBES
354 def_bool y
356 config PPC_ADV_DEBUG_REGS
357 bool
358 depends on 40x || BOOKE
359 default y
361 config PPC_ADV_DEBUG_IACS
362 int
363 depends on PPC_ADV_DEBUG_REGS
364 default 4 if 44x
365 default 2
367 config PPC_ADV_DEBUG_DACS
368 int
369 depends on PPC_ADV_DEBUG_REGS
370 default 2
372 config PPC_ADV_DEBUG_DVCS
373 int
374 depends on PPC_ADV_DEBUG_REGS
375 default 2 if 44x
376 default 0
378 config PPC_ADV_DEBUG_DAC_RANGE
379 bool
380 depends on PPC_ADV_DEBUG_REGS && 44x
381 default y
383 config ZONE_DMA32
384 bool
385 default y if PPC64
387 config PGTABLE_LEVELS
388 int
389 default 2 if !PPC64
390 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
391 default 4
393 source "arch/powerpc/sysdev/Kconfig"
394 source "arch/powerpc/platforms/Kconfig"
396 menu "Kernel options"
398 config HIGHMEM
399 bool "High memory support"
400 depends on PPC32
402 source kernel/Kconfig.hz
404 config HUGETLB_PAGE_SIZE_VARIABLE
405 bool
406 depends on HUGETLB_PAGE
407 default y
409 config MATH_EMULATION
410 bool "Math emulation"
411 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
412 ---help---
413 Some PowerPC chips designed for embedded applications do not have
414 a floating-point unit and therefore do not implement the
415 floating-point instructions in the PowerPC instruction set. If you
416 say Y here, the kernel will include code to emulate a floating-point
417 unit, which will allow programs that use floating-point
418 instructions to run.
420 This is also useful to emulate missing (optional) instructions
421 such as fsqrt on cores that do have an FPU but do not implement
422 them (such as Freescale BookE).
424 choice
425 prompt "Math emulation options"
426 default MATH_EMULATION_FULL
427 depends on MATH_EMULATION
429 config MATH_EMULATION_FULL
430 bool "Emulate all the floating point instructions"
431 ---help---
432 Select this option will enable the kernel to support to emulate
433 all the floating point instructions. If your SoC doesn't have
434 a FPU, you should select this.
436 config MATH_EMULATION_HW_UNIMPLEMENTED
437 bool "Just emulate the FPU unimplemented instructions"
438 ---help---
439 Select this if you know there does have a hardware FPU on your
440 SoC, but some floating point instructions are not implemented by that.
442 endchoice
444 config PPC_TRANSACTIONAL_MEM
445 bool "Transactional Memory support for POWERPC"
446 depends on PPC_BOOK3S_64
447 depends on SMP
448 select ALTIVEC
449 select VSX
450 default n
451 ---help---
452 Support user-mode Transactional Memory on POWERPC.
454 config LD_HEAD_STUB_CATCH
455 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
456 depends on PPC64
457 default n
458 help
459 Very large kernels can cause linker branch stubs to be generated by
460 code in head_64.S, which moves the head text sections out of their
461 specified location. This option can work around the problem.
463 If unsure, say "N".
465 config MPROFILE_KERNEL
466 depends on PPC64 && CPU_LITTLE_ENDIAN
467 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
469 config HOTPLUG_CPU
470 bool "Support for enabling/disabling CPUs"
471 depends on SMP && (PPC_PSERIES || \
472 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
473 ---help---
474 Say Y here to be able to disable and re-enable individual
475 CPUs at runtime on SMP machines.
477 Say N if you are unsure.
479 config ARCH_CPU_PROBE_RELEASE
480 def_bool y
481 depends on HOTPLUG_CPU
483 config ARCH_ENABLE_MEMORY_HOTPLUG
484 def_bool y
486 config ARCH_HAS_WALK_MEMORY
487 def_bool y
489 config ARCH_ENABLE_MEMORY_HOTREMOVE
490 def_bool y
492 config PPC64_SUPPORTS_MEMORY_FAILURE
493 bool "Add support for memory hwpoison"
494 depends on PPC_BOOK3S_64
495 default "y" if PPC_POWERNV
496 select ARCH_SUPPORTS_MEMORY_FAILURE
498 config KEXEC
499 bool "kexec system call"
500 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
501 select KEXEC_CORE
502 help
503 kexec is a system call that implements the ability to shutdown your
504 current kernel, and to start another kernel. It is like a reboot
505 but it is independent of the system firmware. And like a reboot
506 you can start any kernel with it, not just Linux.
508 The name comes from the similarity to the exec system call.
510 It is an ongoing process to be certain the hardware in a machine
511 is properly shutdown, so do not be surprised if this code does not
512 initially work for you. As of this writing the exact hardware
513 interface is strongly in flux, so no good recommendation can be
514 made.
516 config KEXEC_FILE
517 bool "kexec file based system call"
518 select KEXEC_CORE
519 select HAVE_IMA_KEXEC
520 select BUILD_BIN2C
521 depends on PPC64
522 depends on CRYPTO=y
523 depends on CRYPTO_SHA256=y
524 help
525 This is a new version of the kexec system call. This call is
526 file based and takes in file descriptors as system call arguments
527 for kernel and initramfs as opposed to a list of segments as is the
528 case for the older kexec call.
530 config ARCH_HAS_KEXEC_PURGATORY
531 def_bool KEXEC_FILE
533 config RELOCATABLE
534 bool "Build a relocatable kernel"
535 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
536 select NONSTATIC_KERNEL
537 select MODULE_REL_CRCS if MODVERSIONS
538 help
539 This builds a kernel image that is capable of running at the
540 location the kernel is loaded at. For ppc32, there is no any
541 alignment restrictions, and this feature is a superset of
542 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
543 16k-aligned base address. The kernel is linked as a
544 position-independent executable (PIE) and contains dynamic relocations
545 which are processed early in the bootup process.
547 One use is for the kexec on panic case where the recovery kernel
548 must live at a different physical address than the primary
549 kernel.
551 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
552 it has been loaded at and the compile time physical addresses
553 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
554 setting can still be useful to bootwrappers that need to know the
555 load address of the kernel (eg. u-boot/mkimage).
557 config RELOCATABLE_TEST
558 bool "Test relocatable kernel"
559 depends on (PPC64 && RELOCATABLE)
560 default n
561 help
562 This runs the relocatable kernel at the address it was initially
563 loaded at, which tends to be non-zero and therefore test the
564 relocation code.
566 config CRASH_DUMP
567 bool "Build a dump capture kernel"
568 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
569 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
570 help
571 Build a kernel suitable for use as a dump capture kernel.
572 The same kernel binary can be used as production kernel and dump
573 capture kernel.
575 config FA_DUMP
576 bool "Firmware-assisted dump"
577 depends on PPC64 && PPC_RTAS
578 select CRASH_CORE
579 select CRASH_DUMP
580 help
581 A robust mechanism to get reliable kernel crash dump with
582 assistance from firmware. This approach does not use kexec,
583 instead firmware assists in booting the capture kernel
584 while preserving memory contents. Firmware-assisted dump
585 is meant to be a kdump replacement offering robustness and
586 speed not possible without system firmware assistance.
588 If unsure, say "N"
590 config IRQ_ALL_CPUS
591 bool "Distribute interrupts on all CPUs by default"
592 depends on SMP
593 help
594 This option gives the kernel permission to distribute IRQs across
595 multiple CPUs. Saying N here will route all IRQs to the first
596 CPU. Generally saying Y is safe, although some problems have been
597 reported with SMP Power Macintoshes with this option enabled.
599 config NUMA
600 bool "NUMA support"
601 depends on PPC64
602 default y if SMP && PPC_PSERIES
604 config NODES_SHIFT
605 int
606 default "8" if PPC64
607 default "4"
608 depends on NEED_MULTIPLE_NODES
610 config USE_PERCPU_NUMA_NODE_ID
611 def_bool y
612 depends on NUMA
614 config HAVE_MEMORYLESS_NODES
615 def_bool y
616 depends on NUMA
618 config ARCH_SELECT_MEMORY_MODEL
619 def_bool y
620 depends on PPC64
622 config ARCH_FLATMEM_ENABLE
623 def_bool y
624 depends on (PPC64 && !NUMA) || PPC32
626 config ARCH_SPARSEMEM_ENABLE
627 def_bool y
628 depends on PPC64
629 select SPARSEMEM_VMEMMAP_ENABLE
631 config ARCH_SPARSEMEM_DEFAULT
632 def_bool y
633 depends on PPC_BOOK3S_64
635 config SYS_SUPPORTS_HUGETLBFS
636 bool
638 config ILLEGAL_POINTER_VALUE
639 hex
640 # This is roughly half way between the top of user space and the bottom
641 # of kernel space, which seems about as good as we can get.
642 default 0x5deadbeef0000000 if PPC64
643 default 0
645 config ARCH_MEMORY_PROBE
646 def_bool y
647 depends on MEMORY_HOTPLUG
649 # Some NUMA nodes have memory ranges that span
650 # other nodes. Even though a pfn is valid and
651 # between a node's start and end pfns, it may not
652 # reside on that node. See memmap_init_zone()
653 # for details.
654 config NODES_SPAN_OTHER_NODES
655 def_bool y
656 depends on NEED_MULTIPLE_NODES
658 config STDBINUTILS
659 bool "Using standard binutils settings"
660 depends on 44x
661 default y
662 help
663 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
664 Note, that kernel will be able to run only those applications,
665 which had been compiled using binutils later than 2.17.50.0.3 with
666 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
667 the older binutils, you can patch them with a trivial patch, which
668 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
670 choice
671 prompt "Page size"
672 default PPC_4K_PAGES
673 help
674 Select the kernel logical page size. Increasing the page size
675 will reduce software overhead at each page boundary, allow
676 hardware prefetch mechanisms to be more effective, and allow
677 larger dma transfers increasing IO efficiency and reducing
678 overhead. However the utilization of memory will increase.
679 For example, each cached file will using a multiple of the
680 page size to hold its contents and the difference between the
681 end of file and the end of page is wasted.
683 Some dedicated systems, such as software raid serving with
684 accelerated calculations, have shown significant increases.
686 If you configure a 64 bit kernel for 64k pages but the
687 processor does not support them, then the kernel will simulate
688 them with 4k pages, loading them on demand, but with the
689 reduced software overhead and larger internal fragmentation.
690 For the 32 bit kernel, a large page option will not be offered
691 unless it is supported by the configured processor.
693 If unsure, choose 4K_PAGES.
695 config PPC_4K_PAGES
696 bool "4k page size"
697 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
699 config PPC_16K_PAGES
700 bool "16k page size"
701 depends on 44x || PPC_8xx
703 config PPC_64K_PAGES
704 bool "64k page size"
705 depends on !PPC_FSL_BOOK3E && (44x || PPC_BOOK3S_64 || PPC_BOOK3E_64)
706 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
708 config PPC_256K_PAGES
709 bool "256k page size"
710 depends on 44x && !STDBINUTILS
711 help
712 Make the page size 256k.
714 As the ELF standard only requires alignment to support page
715 sizes up to 64k, you will need to compile all of your user
716 space applications with a non-standard binutils settings
717 (see the STDBINUTILS description for details).
719 Say N unless you know what you are doing.
721 endchoice
723 config THREAD_SHIFT
724 int "Thread shift" if EXPERT
725 range 13 15
726 default "15" if PPC_256K_PAGES
727 default "14" if PPC64
728 default "13"
729 help
730 Used to define the stack size. The default is almost always what you
731 want. Only change this if you know what you are doing.
733 config FORCE_MAX_ZONEORDER
734 int "Maximum zone order"
735 range 8 9 if PPC64 && PPC_64K_PAGES
736 default "9" if PPC64 && PPC_64K_PAGES
737 range 13 13 if PPC64 && !PPC_64K_PAGES
738 default "13" if PPC64 && !PPC_64K_PAGES
739 range 9 64 if PPC32 && PPC_16K_PAGES
740 default "9" if PPC32 && PPC_16K_PAGES
741 range 7 64 if PPC32 && PPC_64K_PAGES
742 default "7" if PPC32 && PPC_64K_PAGES
743 range 5 64 if PPC32 && PPC_256K_PAGES
744 default "5" if PPC32 && PPC_256K_PAGES
745 range 11 64
746 default "11"
747 help
748 The kernel memory allocator divides physically contiguous memory
749 blocks into "zones", where each zone is a power of two number of
750 pages. This option selects the largest power of two that the kernel
751 keeps in the memory allocator. If you need to allocate very large
752 blocks of physically contiguous memory, then you may need to
753 increase this value.
755 This config option is actually maximum order plus one. For example,
756 a value of 11 means that the largest free memory block is 2^10 pages.
758 The page size is not necessarily 4KB. For example, on 64-bit
759 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
760 this in mind when choosing a value for this option.
762 config PPC_SUBPAGE_PROT
763 bool "Support setting protections for 4k subpages"
764 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
765 help
766 This option adds support for a system call to allow user programs
767 to set access permissions (read/write, readonly, or no access)
768 on the 4k subpages of each 64k page.
770 config PPC_COPRO_BASE
771 bool
772 default n
774 config SCHED_SMT
775 bool "SMT (Hyperthreading) scheduler support"
776 depends on PPC64 && SMP
777 help
778 SMT scheduler support improves the CPU scheduler's decision making
779 when dealing with POWER5 cpus at a cost of slightly increased
780 overhead in some places. If unsure say N here.
782 config PPC_DENORMALISATION
783 bool "PowerPC denormalisation exception handling"
784 depends on PPC_BOOK3S_64
785 default "y" if PPC_POWERNV
786 ---help---
787 Add support for handling denormalisation of single precision
788 values. Useful for bare metal only. If unsure say Y here.
790 config CMDLINE_BOOL
791 bool "Default bootloader kernel arguments"
793 config CMDLINE
794 string "Initial kernel command string"
795 depends on CMDLINE_BOOL
796 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
797 help
798 On some platforms, there is currently no way for the boot loader to
799 pass arguments to the kernel. For these platforms, you can supply
800 some command-line options at build time by entering them here. In
801 most cases you will need to specify the root device here.
803 config CMDLINE_FORCE
804 bool "Always use the default kernel command string"
805 depends on CMDLINE_BOOL
806 help
807 Always use the default kernel command string, even if the boot
808 loader passes other arguments to the kernel.
809 This is useful if you cannot or don't want to change the
810 command-line options your boot loader passes to the kernel.
812 config EXTRA_TARGETS
813 string "Additional default image types"
814 help
815 List additional targets to be built by the bootwrapper here (separated
816 by spaces). This is useful for targets that depend of device tree
817 files in the .dts directory.
819 Targets in this list will be build as part of the default build
820 target, or when the user does a 'make zImage' or a
821 'make zImage.initrd'.
823 If unsure, leave blank
825 config ARCH_WANTS_FREEZER_CONTROL
826 def_bool y
827 depends on ADB_PMU
829 source kernel/power/Kconfig
831 config SECCOMP
832 bool "Enable seccomp to safely compute untrusted bytecode"
833 depends on PROC_FS
834 default y
835 help
836 This kernel feature is useful for number crunching applications
837 that may need to compute untrusted bytecode during their
838 execution. By using pipes or other transports made available to
839 the process as file descriptors supporting the read/write
840 syscalls, it's possible to isolate those applications in
841 their own address space using seccomp. Once seccomp is
842 enabled via /proc/<pid>/seccomp, it cannot be disabled
843 and the task is only allowed to execute a few safe syscalls
844 defined by each seccomp mode.
846 If unsure, say Y. Only embedded should say N here.
848 config PPC_MEM_KEYS
849 prompt "PowerPC Memory Protection Keys"
850 def_bool y
851 depends on PPC_BOOK3S_64
852 select ARCH_USES_HIGH_VMA_FLAGS
853 select ARCH_HAS_PKEYS
854 help
855 Memory Protection Keys provides a mechanism for enforcing
856 page-based protections, but without requiring modification of the
857 page tables when an application changes protection domains.
859 For details, see Documentation/vm/protection-keys.rst
861 If unsure, say y.
863 endmenu
865 config ISA_DMA_API
866 bool
867 default PCI
869 menu "Bus options"
871 config ISA
872 bool "Support for ISA-bus hardware"
873 depends on PPC_CHRP
874 select PPC_I8259
875 help
876 Find out whether you have ISA slots on your motherboard. ISA is the
877 name of a bus system, i.e. the way the CPU talks to the other stuff
878 inside your box. If you have an Apple machine, say N here; if you
879 have an IBM RS/6000 or pSeries machine, say Y. If you have an
880 embedded board, consult your board documentation.
882 config ZONE_DMA
883 bool
884 default y
886 config GENERIC_ISA_DMA
887 bool
888 depends on ISA_DMA_API
889 default y
891 config PPC_INDIRECT_PCI
892 bool
893 depends on PCI
894 default y if 40x || 44x
895 default n
897 config EISA
898 bool
900 config SBUS
901 bool
903 config FSL_SOC
904 bool
906 config FSL_PCI
907 bool
908 select PPC_INDIRECT_PCI
909 select PCI_QUIRKS
911 config FSL_PMC
912 bool
913 default y
914 depends on SUSPEND && (PPC_85xx || PPC_86xx)
915 help
916 Freescale MPC85xx/MPC86xx power management controller support
917 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
919 config PPC4xx_CPM
920 bool
921 default y
922 depends on SUSPEND && (44x || 40x)
923 help
924 PPC4xx Clock Power Management (CPM) support (suspend/resume).
925 It also enables support for two different idle states (idle-wait
926 and idle-doze).
928 config 4xx_SOC
929 bool
931 config FSL_LBC
932 bool "Freescale Local Bus support"
933 help
934 Enables reporting of errors from the Freescale local bus
935 controller. Also contains some common code used by
936 drivers for specific local bus peripherals.
938 config FSL_GTM
939 bool
940 depends on PPC_83xx || QUICC_ENGINE || CPM2
941 help
942 Freescale General-purpose Timers support
944 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
945 config MCA
946 bool
948 # Platforms that what PCI turned unconditionally just do select PCI
949 # in their config node. Platforms that want to choose at config
950 # time should select PPC_PCI_CHOICE
951 config PPC_PCI_CHOICE
952 bool
954 config PCI
955 bool "PCI support" if PPC_PCI_CHOICE
956 default y if !40x && !CPM2 && !PPC_8xx && !PPC_83xx \
957 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
958 default PCI_QSPAN if PPC_8xx
959 select GENERIC_PCI_IOMAP
960 help
961 Find out whether your system includes a PCI bus. PCI is the name of
962 a bus system, i.e. the way the CPU talks to the other stuff inside
963 your box. If you say Y here, the kernel will include drivers and
964 infrastructure code to support PCI bus devices.
966 config PCI_DOMAINS
967 def_bool PCI
969 config PCI_SYSCALL
970 def_bool PCI
972 config PCI_QSPAN
973 bool "QSpan PCI"
974 depends on PPC_8xx
975 select PPC_I8259
976 help
977 Say Y here if you have a system based on a Motorola 8xx-series
978 embedded processor with a QSPAN PCI interface, otherwise say N.
980 config PCI_8260
981 bool
982 depends on PCI && 8260
983 select PPC_INDIRECT_PCI
984 default y
986 source "drivers/pci/Kconfig"
988 source "drivers/pcmcia/Kconfig"
990 config HAS_RAPIDIO
991 bool
992 default n
994 config RAPIDIO
995 tristate "RapidIO support"
996 depends on HAS_RAPIDIO || PCI
997 help
998 If you say Y here, the kernel will include drivers and
999 infrastructure code to support RapidIO interconnect devices.
1001 config FSL_RIO
1002 bool "Freescale Embedded SRIO Controller support"
1003 depends on RAPIDIO = y && HAS_RAPIDIO
1004 default "n"
1005 ---help---
1006 Include support for RapidIO controller on Freescale embedded
1007 processors (MPC8548, MPC8641, etc).
1009 source "drivers/rapidio/Kconfig"
1011 endmenu
1013 config NONSTATIC_KERNEL
1014 bool
1015 default n
1017 menu "Advanced setup"
1018 depends on PPC32
1020 config ADVANCED_OPTIONS
1021 bool "Prompt for advanced kernel configuration options"
1022 help
1023 This option will enable prompting for a variety of advanced kernel
1024 configuration options. These options can cause the kernel to not
1025 work if they are set incorrectly, but can be used to optimize certain
1026 aspects of kernel memory management.
1028 Unless you know what you are doing, say N here.
1030 comment "Default settings for advanced configuration options are used"
1031 depends on !ADVANCED_OPTIONS
1033 config LOWMEM_SIZE_BOOL
1034 bool "Set maximum low memory"
1035 depends on ADVANCED_OPTIONS
1036 help
1037 This option allows you to set the maximum amount of memory which
1038 will be used as "low memory", that is, memory which the kernel can
1039 access directly, without having to set up a kernel virtual mapping.
1040 This can be useful in optimizing the layout of kernel virtual
1041 memory.
1043 Say N here unless you know what you are doing.
1045 config LOWMEM_SIZE
1046 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1047 default "0x30000000"
1049 config LOWMEM_CAM_NUM_BOOL
1050 bool "Set number of CAMs to use to map low memory"
1051 depends on ADVANCED_OPTIONS && FSL_BOOKE
1052 help
1053 This option allows you to set the maximum number of CAM slots that
1054 will be used to map low memory. There are a limited number of slots
1055 available and even more limited number that will fit in the L1 MMU.
1056 However, using more entries will allow mapping more low memory. This
1057 can be useful in optimizing the layout of kernel virtual memory.
1059 Say N here unless you know what you are doing.
1061 config LOWMEM_CAM_NUM
1062 depends on FSL_BOOKE
1063 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1064 default 3
1066 config DYNAMIC_MEMSTART
1067 bool "Enable page aligned dynamic load address for kernel"
1068 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1069 select NONSTATIC_KERNEL
1070 help
1071 This option enables the kernel to be loaded at any page aligned
1072 physical address. The kernel creates a mapping from KERNELBASE to
1073 the address where the kernel is loaded. The page size here implies
1074 the TLB page size of the mapping for kernel on the particular platform.
1075 Please refer to the init code for finding the TLB page size.
1077 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1078 kernel image, where the only restriction is the page aligned kernel
1079 load address. When this option is enabled, the compile time physical
1080 address CONFIG_PHYSICAL_START is ignored.
1082 This option is overridden by CONFIG_RELOCATABLE
1084 config PAGE_OFFSET_BOOL
1085 bool "Set custom page offset address"
1086 depends on ADVANCED_OPTIONS
1087 help
1088 This option allows you to set the kernel virtual address at which
1089 the kernel will map low memory. This can be useful in optimizing
1090 the virtual memory layout of the system.
1092 Say N here unless you know what you are doing.
1094 config PAGE_OFFSET
1095 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1096 default "0xc0000000"
1098 config KERNEL_START_BOOL
1099 bool "Set custom kernel base address"
1100 depends on ADVANCED_OPTIONS
1101 help
1102 This option allows you to set the kernel virtual address at which
1103 the kernel will be loaded. Normally this should match PAGE_OFFSET
1104 however there are times (like kdump) that one might not want them
1105 to be the same.
1107 Say N here unless you know what you are doing.
1109 config KERNEL_START
1110 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1111 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1112 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1113 default "0xc0000000"
1115 config PHYSICAL_START_BOOL
1116 bool "Set physical address where the kernel is loaded"
1117 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1118 help
1119 This gives the physical address where the kernel is loaded.
1121 Say N here unless you know what you are doing.
1123 config PHYSICAL_START
1124 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1125 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1126 default "0x00000000"
1128 config PHYSICAL_ALIGN
1129 hex
1130 default "0x04000000" if FSL_BOOKE
1131 help
1132 This value puts the alignment restrictions on physical address
1133 where kernel is loaded and run from. Kernel is compiled for an
1134 address which meets above alignment restriction.
1136 config TASK_SIZE_BOOL
1137 bool "Set custom user task size"
1138 depends on ADVANCED_OPTIONS
1139 help
1140 This option allows you to set the amount of virtual address space
1141 allocated to user tasks. This can be useful in optimizing the
1142 virtual memory layout of the system.
1144 Say N here unless you know what you are doing.
1146 config TASK_SIZE
1147 hex "Size of user task space" if TASK_SIZE_BOOL
1148 default "0x80000000" if PPC_8xx
1149 default "0xc0000000"
1151 config CONSISTENT_SIZE_BOOL
1152 bool "Set custom consistent memory pool size"
1153 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1154 help
1155 This option allows you to set the size of the
1156 consistent memory pool. This pool of virtual memory
1157 is used to make consistent memory allocations.
1159 config CONSISTENT_SIZE
1160 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1161 default "0x00200000" if NOT_COHERENT_CACHE
1163 config PIN_TLB
1164 bool "Pinned Kernel TLBs (860 ONLY)"
1165 depends on ADVANCED_OPTIONS && PPC_8xx && \
1166 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1168 config PIN_TLB_DATA
1169 bool "Pinned TLB for DATA"
1170 depends on PIN_TLB
1171 default y
1173 config PIN_TLB_IMMR
1174 bool "Pinned TLB for IMMR"
1175 depends on PIN_TLB
1176 default y
1178 config PIN_TLB_TEXT
1179 bool "Pinned TLB for TEXT"
1180 depends on PIN_TLB
1181 default y
1182 endmenu
1184 if PPC64
1185 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1186 config PAGE_OFFSET
1187 hex
1188 default "0xc000000000000000"
1189 config KERNEL_START
1190 hex
1191 default "0xc000000000000000"
1192 config PHYSICAL_START
1193 hex
1194 default "0x00000000"
1195 endif
1197 config ARCH_RANDOM
1198 def_bool n
1200 config PPC_LIB_RHEAP
1201 bool
1203 source "arch/powerpc/kvm/Kconfig"
1205 source "kernel/livepatch/Kconfig"