| blob | 497b7d0b2d7edf7cbefe4c1a86f678502c3fd8dc |
1 # SPDX-License-Identifier: GPL-2.0
2 source "arch/powerpc/platforms/Kconfig.cputype"
4 config 32BIT
5 bool
6 default y if PPC32
8 config 64BIT
9 bool
10 default y if PPC64
12 config MMU
13 bool
14 default y
16 config ARCH_MMAP_RND_BITS_MAX
17 # On Book3S 64, the default virtual address space for 64-bit processes
18 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
19 # 32T of address space (2^45), which should ensure a reasonable gap
20 # between bottom-up and top-down allocations for applications that
21 # consume "normal" amounts of address space. Book3S 64 only supports 64K
22 # and 4K page sizes.
23 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
24 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K)
25 #
26 # On all other 64-bit platforms (currently only Book3E), the virtual
27 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
28 # of address space (2^44). Only 4K page sizes are supported.
29 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K)
30 #
31 # For 32-bit, use the compat values, as they're the same.
32 default ARCH_MMAP_RND_COMPAT_BITS_MAX
34 config ARCH_MMAP_RND_BITS_MIN
35 # Allow randomisation to consume up to 1GB of address space (2^30).
36 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K)
37 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K)
38 #
39 # For 32-bit, use the compat values, as they're the same.
40 default ARCH_MMAP_RND_COMPAT_BITS_MIN
42 config ARCH_MMAP_RND_COMPAT_BITS_MAX
43 # Total virtual address space for 32-bit processes is 2^31 (2GB).
44 # Allow randomisation to consume up to 512MB of address space (2^29).
45 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K)
46 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K)
47 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K)
48 default 17 # 17 = 29 (512MB) - 12 (4K)
50 config ARCH_MMAP_RND_COMPAT_BITS_MIN
51 # Total virtual address space for 32-bit processes is 2^31 (2GB).
52 # Allow randomisation to consume up to 8MB of address space (2^23).
53 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K)
54 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K)
55 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K)
56 default 11 # 11 = 23 (8MB) - 12 (4K)
58 config HAVE_SETUP_PER_CPU_AREA
59 def_bool PPC64
61 config NEED_PER_CPU_EMBED_FIRST_CHUNK
62 def_bool PPC64
64 config NR_IRQS
65 int "Number of virtual interrupt numbers"
66 range 32 32768
67 default "512"
68 help
69 This defines the number of virtual interrupt numbers the kernel
70 can manage. Virtual interrupt numbers are what you see in
71 /proc/interrupts. If you configure your system to have too few,
72 drivers will fail to load or worse - handle with care.
74 config NMI_IPI
75 bool
76 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
77 default y
79 config PPC_WATCHDOG
80 bool
81 depends on HARDLOCKUP_DETECTOR
82 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
83 default y
84 help
85 This is a placeholder when the powerpc hardlockup detector
86 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
87 seleted via the generic lockup detector menu which is why we
88 have no standalone config option for it here.
90 config STACKTRACE_SUPPORT
91 bool
92 default y
94 config TRACE_IRQFLAGS_SUPPORT
95 bool
96 default y
98 config LOCKDEP_SUPPORT
99 bool
100 default y
102 config GENERIC_LOCKBREAK
103 bool
104 default y
105 depends on SMP && PREEMPTION
107 config GENERIC_HWEIGHT
108 bool
109 default y
111 config PPC
112 bool
113 default y
114 #
115 # Please keep this list sorted alphabetically.
116 #
117 select ARCH_32BIT_OFF_T if PPC32
118 select ARCH_HAS_DEBUG_VIRTUAL
119 select ARCH_HAS_DEVMEM_IS_ALLOWED
120 select ARCH_HAS_ELF_RANDOMIZE
121 select ARCH_HAS_FORTIFY_SOURCE
122 select ARCH_HAS_GCOV_PROFILE_ALL
123 select ARCH_HAS_KCOV
124 select ARCH_HAS_HUGEPD if HUGETLB_PAGE
125 select ARCH_HAS_MMIOWB if PPC64
126 select ARCH_HAS_PHYS_TO_DMA
127 select ARCH_HAS_PMEM_API
128 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
129 select ARCH_HAS_PTE_SPECIAL
130 select ARCH_HAS_MEMBARRIER_CALLBACKS
131 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
132 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !HIBERNATION)
133 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
134 select ARCH_HAS_UACCESS_FLUSHCACHE
135 select ARCH_HAS_UACCESS_MCSAFE if PPC64
136 select ARCH_HAS_UBSAN_SANITIZE_ALL
137 select ARCH_HAVE_NMI_SAFE_CMPXCHG
138 select ARCH_KEEP_MEMBLOCK
139 select ARCH_MIGHT_HAVE_PC_PARPORT
140 select ARCH_MIGHT_HAVE_PC_SERIO
141 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
142 select ARCH_SUPPORTS_ATOMIC_RMW
143 select ARCH_USE_BUILTIN_BSWAP
144 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
145 select ARCH_WANT_IPC_PARSE_VERSION
146 select ARCH_WEAK_RELEASE_ACQUIRE
147 select BINFMT_ELF
148 select BUILDTIME_TABLE_SORT
149 select CLONE_BACKWARDS
150 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
151 select DYNAMIC_FTRACE if FUNCTION_TRACER
152 select EDAC_ATOMIC_SCRUB
153 select EDAC_SUPPORT
154 select GENERIC_ATOMIC64 if PPC32
155 select GENERIC_CLOCKEVENTS
156 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
157 select GENERIC_CMOS_UPDATE
158 select GENERIC_CPU_AUTOPROBE
159 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
160 select GENERIC_EARLY_IOREMAP
161 select GENERIC_IRQ_SHOW
162 select GENERIC_IRQ_SHOW_LEVEL
163 select GENERIC_PCI_IOMAP if PCI
164 select GENERIC_SMP_IDLE_THREAD
165 select GENERIC_STRNCPY_FROM_USER
166 select GENERIC_STRNLEN_USER
167 select GENERIC_TIME_VSYSCALL
168 select HAVE_ARCH_AUDITSYSCALL
169 select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
170 select HAVE_ARCH_JUMP_LABEL
171 select HAVE_ARCH_KASAN if PPC32
172 select HAVE_ARCH_KASAN_VMALLOC if PPC32
173 select HAVE_ARCH_KGDB
174 select HAVE_ARCH_MMAP_RND_BITS
175 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
176 select HAVE_ARCH_NVRAM_OPS
177 select HAVE_ARCH_SECCOMP_FILTER
178 select HAVE_ARCH_TRACEHOOK
179 select HAVE_ASM_MODVERSIONS
180 select HAVE_C_RECORDMCOUNT
181 select HAVE_CBPF_JIT if !PPC64
182 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
183 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
184 select HAVE_CONTEXT_TRACKING if PPC64
185 select HAVE_COPY_THREAD_TLS
186 select HAVE_DEBUG_KMEMLEAK
187 select HAVE_DEBUG_STACKOVERFLOW
188 select HAVE_DYNAMIC_FTRACE
189 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
190 select HAVE_EBPF_JIT if PPC64
191 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
192 select HAVE_FAST_GUP
193 select HAVE_FTRACE_MCOUNT_RECORD
194 select HAVE_FUNCTION_ERROR_INJECTION
195 select HAVE_FUNCTION_GRAPH_TRACER
196 select HAVE_FUNCTION_TRACER
197 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
198 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
199 select HAVE_IDE
200 select HAVE_IOREMAP_PROT
201 select HAVE_IRQ_EXIT_ON_IRQ_STACK
202 select HAVE_KERNEL_GZIP
203 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
204 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
205 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
206 select HAVE_KPROBES
207 select HAVE_KPROBES_ON_FTRACE
208 select HAVE_KRETPROBES
209 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
210 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
211 select HAVE_MEMBLOCK_NODE_MAP
212 select HAVE_MOD_ARCH_SPECIFIC
213 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
214 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
215 select HAVE_OPROFILE
216 select HAVE_OPTPROBES if PPC64
217 select HAVE_PERF_EVENTS
218 select HAVE_PERF_EVENTS_NMI if PPC64
219 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
220 select HAVE_PERF_REGS
221 select HAVE_PERF_USER_STACK_DUMP
222 select MMU_GATHER_RCU_TABLE_FREE
223 select MMU_GATHER_PAGE_SIZE
224 select HAVE_REGS_AND_STACK_ACCESS_API
225 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
226 select HAVE_SYSCALL_TRACEPOINTS
227 select HAVE_VIRT_CPU_ACCOUNTING
228 select HAVE_IRQ_TIME_ACCOUNTING
229 select HAVE_RSEQ
230 select IOMMU_HELPER if PPC64
231 select IRQ_DOMAIN
232 select IRQ_FORCED_THREADING
233 select MODULES_USE_ELF_RELA
234 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
235 select NEED_SG_DMA_LENGTH
236 select OF
237 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
238 select OF_EARLY_FLATTREE
239 select OLD_SIGACTION if PPC32
240 select OLD_SIGSUSPEND
241 select PCI_DOMAINS if PCI
242 select PCI_SYSCALL if PCI
243 select PPC_DAWR if PPC64
244 select RTC_LIB
245 select SPARSE_IRQ
246 select SYSCTL_EXCEPTION_TRACE
247 select THREAD_INFO_IN_TASK
248 select VIRT_TO_BUS if !PPC64
249 #
250 # Please keep this list sorted alphabetically.
251 #
253 config PPC_BARRIER_NOSPEC
254 bool
255 default y
256 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
258 config EARLY_PRINTK
259 bool
260 default y
262 config PANIC_TIMEOUT
263 int
264 default 180
266 config COMPAT
267 bool
268 default y if PPC64
269 select COMPAT_BINFMT_ELF
270 select ARCH_WANT_OLD_COMPAT_IPC
271 select COMPAT_OLD_SIGACTION
273 config SYSVIPC_COMPAT
274 bool
275 depends on COMPAT && SYSVIPC
276 default y
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
289 config GENERIC_TBSYNC
290 bool
291 default y if PPC32 && SMP
293 config AUDIT_ARCH
294 bool
295 default y
297 config GENERIC_BUG
298 bool
299 default y
300 depends on BUG
302 config SYS_SUPPORTS_APM_EMULATION
303 default y if PMAC_APM_EMU
304 bool
306 config EPAPR_BOOT
307 bool
308 help
309 Used to allow a board to specify it wants an ePAPR compliant wrapper.
311 config DEFAULT_UIMAGE
312 bool
313 help
314 Used to allow a board to specify it wants a uImage built by default
316 config ARCH_HIBERNATION_POSSIBLE
317 bool
318 default y
320 config ARCH_SUSPEND_POSSIBLE
321 def_bool y
322 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
323 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
324 || 44x || 40x
326 config ARCH_SUSPEND_NONZERO_CPU
327 def_bool y
328 depends on PPC_POWERNV || PPC_PSERIES
330 config PPC_DCR_NATIVE
331 bool
333 config PPC_DCR_MMIO
334 bool
336 config PPC_DCR
337 bool
338 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
339 default y
341 config PPC_OF_PLATFORM_PCI
342 bool
343 depends on PCI
344 depends on PPC64 # not supported on 32 bits yet
346 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
347 depends on PPC32 || PPC_BOOK3S_64
348 def_bool y
350 config ARCH_SUPPORTS_UPROBES
351 def_bool y
353 config PPC_ADV_DEBUG_REGS
354 bool
355 depends on 40x || BOOKE
356 default y
358 config PPC_ADV_DEBUG_IACS
359 int
360 depends on PPC_ADV_DEBUG_REGS
361 default 4 if 44x
362 default 2
364 config PPC_ADV_DEBUG_DACS
365 int
366 depends on PPC_ADV_DEBUG_REGS
367 default 2
369 config PPC_ADV_DEBUG_DVCS
370 int
371 depends on PPC_ADV_DEBUG_REGS
372 default 2 if 44x
373 default 0
375 config PPC_ADV_DEBUG_DAC_RANGE
376 bool
377 depends on PPC_ADV_DEBUG_REGS && 44x
378 default y
380 config PPC_DAWR
381 bool
383 config ZONE_DMA
384 bool
385 default y if PPC_BOOK3E_64
387 config PGTABLE_LEVELS
388 int
389 default 2 if !PPC64
390 default 4
392 source "arch/powerpc/sysdev/Kconfig"
393 source "arch/powerpc/platforms/Kconfig"
395 menu "Kernel options"
397 config HIGHMEM
398 bool "High memory support"
399 depends on PPC32
401 source "kernel/Kconfig.hz"
403 config HUGETLB_PAGE_SIZE_VARIABLE
404 bool
405 depends on HUGETLB_PAGE && PPC_BOOK3S_64
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 help
450 Support user-mode Transactional Memory on POWERPC.
452 config PPC_UV
453 bool "Ultravisor support"
454 depends on KVM_BOOK3S_HV_POSSIBLE
455 depends on DEVICE_PRIVATE
456 default n
457 help
458 This option paravirtualizes the kernel to run in POWER platforms that
459 supports the Protected Execution Facility (PEF). On such platforms,
460 the ultravisor firmware runs at a privilege level above the
461 hypervisor.
463 If unsure, say "N".
465 config LD_HEAD_STUB_CATCH
466 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
467 depends on PPC64
468 help
469 Very large kernels can cause linker branch stubs to be generated by
470 code in head_64.S, which moves the head text sections out of their
471 specified location. This option can work around the problem.
473 If unsure, say "N".
475 config MPROFILE_KERNEL
476 depends on PPC64 && CPU_LITTLE_ENDIAN
477 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
479 config HOTPLUG_CPU
480 bool "Support for enabling/disabling CPUs"
481 depends on SMP && (PPC_PSERIES || \
482 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
483 help
484 Say Y here to be able to disable and re-enable individual
485 CPUs at runtime on SMP machines.
487 Say N if you are unsure.
489 config ARCH_CPU_PROBE_RELEASE
490 def_bool y
491 depends on HOTPLUG_CPU
493 config ARCH_ENABLE_MEMORY_HOTPLUG
494 def_bool y
496 config ARCH_ENABLE_MEMORY_HOTREMOVE
497 def_bool y
499 config PPC64_SUPPORTS_MEMORY_FAILURE
500 bool "Add support for memory hwpoison"
501 depends on PPC_BOOK3S_64
502 default "y" if PPC_POWERNV
503 select ARCH_SUPPORTS_MEMORY_FAILURE
505 config KEXEC
506 bool "kexec system call"
507 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
508 select KEXEC_CORE
509 help
510 kexec is a system call that implements the ability to shutdown your
511 current kernel, and to start another kernel. It is like a reboot
512 but it is independent of the system firmware. And like a reboot
513 you can start any kernel with it, not just Linux.
515 The name comes from the similarity to the exec system call.
517 It is an ongoing process to be certain the hardware in a machine
518 is properly shutdown, so do not be surprised if this code does not
519 initially work for you. As of this writing the exact hardware
520 interface is strongly in flux, so no good recommendation can be
521 made.
523 config KEXEC_FILE
524 bool "kexec file based system call"
525 select KEXEC_CORE
526 select HAVE_IMA_KEXEC
527 select BUILD_BIN2C
528 select KEXEC_ELF
529 depends on PPC64
530 depends on CRYPTO=y
531 depends on CRYPTO_SHA256=y
532 help
533 This is a new version of the kexec system call. This call is
534 file based and takes in file descriptors as system call arguments
535 for kernel and initramfs as opposed to a list of segments as is the
536 case for the older kexec call.
538 config ARCH_HAS_KEXEC_PURGATORY
539 def_bool KEXEC_FILE
541 config RELOCATABLE
542 bool "Build a relocatable kernel"
543 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
544 select NONSTATIC_KERNEL
545 select MODULE_REL_CRCS if MODVERSIONS
546 help
547 This builds a kernel image that is capable of running at the
548 location the kernel is loaded at. For ppc32, there is no any
549 alignment restrictions, and this feature is a superset of
550 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
551 16k-aligned base address. The kernel is linked as a
552 position-independent executable (PIE) and contains dynamic relocations
553 which are processed early in the bootup process.
555 One use is for the kexec on panic case where the recovery kernel
556 must live at a different physical address than the primary
557 kernel.
559 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
560 it has been loaded at and the compile time physical addresses
561 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
562 setting can still be useful to bootwrappers that need to know the
563 load address of the kernel (eg. u-boot/mkimage).
565 config RANDOMIZE_BASE
566 bool "Randomize the address of the kernel image"
567 depends on (FSL_BOOKE && FLATMEM && PPC32)
568 depends on RELOCATABLE
569 help
570 Randomizes the virtual address at which the kernel image is
571 loaded, as a security feature that deters exploit attempts
572 relying on knowledge of the location of kernel internals.
574 If unsure, say Y.
576 config RELOCATABLE_TEST
577 bool "Test relocatable kernel"
578 depends on (PPC64 && RELOCATABLE)
579 help
580 This runs the relocatable kernel at the address it was initially
581 loaded at, which tends to be non-zero and therefore test the
582 relocation code.
584 config CRASH_DUMP
585 bool "Build a dump capture kernel"
586 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
587 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
588 help
589 Build a kernel suitable for use as a dump capture kernel.
590 The same kernel binary can be used as production kernel and dump
591 capture kernel.
593 config FA_DUMP
594 bool "Firmware-assisted dump"
595 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
596 select CRASH_CORE
597 select CRASH_DUMP
598 help
599 A robust mechanism to get reliable kernel crash dump with
600 assistance from firmware. This approach does not use kexec,
601 instead firmware assists in booting the capture kernel
602 while preserving memory contents. Firmware-assisted dump
603 is meant to be a kdump replacement offering robustness and
604 speed not possible without system firmware assistance.
606 If unsure, say "y". Only special kernels like petitboot may
607 need to say "N" here.
609 config PRESERVE_FA_DUMP
610 bool "Preserve Firmware-assisted dump"
611 depends on PPC64 && PPC_POWERNV && !FA_DUMP
612 help
613 On a kernel with FA_DUMP disabled, this option helps to preserve
614 crash data from a previously crash'ed kernel. Useful when the next
615 memory preserving kernel boot would process this crash data.
616 Petitboot kernel is the typical usecase for this option.
618 config OPAL_CORE
619 bool "Export OPAL memory as /sys/firmware/opal/core"
620 depends on PPC64 && PPC_POWERNV
621 help
622 This option uses the MPIPL support in firmware to provide an
623 ELF core of OPAL memory after a crash. The ELF core is exported
624 as /sys/firmware/opal/core file which is helpful in debugging
625 OPAL crashes using GDB.
627 config IRQ_ALL_CPUS
628 bool "Distribute interrupts on all CPUs by default"
629 depends on SMP
630 help
631 This option gives the kernel permission to distribute IRQs across
632 multiple CPUs. Saying N here will route all IRQs to the first
633 CPU. Generally saying Y is safe, although some problems have been
634 reported with SMP Power Macintoshes with this option enabled.
636 config NUMA
637 bool "NUMA support"
638 depends on PPC64
639 default y if SMP && PPC_PSERIES
641 config NODES_SHIFT
642 int
643 default "8" if PPC64
644 default "4"
645 depends on NEED_MULTIPLE_NODES
647 config USE_PERCPU_NUMA_NODE_ID
648 def_bool y
649 depends on NUMA
651 config HAVE_MEMORYLESS_NODES
652 def_bool y
653 depends on NUMA
655 config ARCH_SELECT_MEMORY_MODEL
656 def_bool y
657 depends on PPC64
659 config ARCH_FLATMEM_ENABLE
660 def_bool y
661 depends on (PPC64 && !NUMA) || PPC32
663 config ARCH_SPARSEMEM_ENABLE
664 def_bool y
665 depends on PPC64
666 select SPARSEMEM_VMEMMAP_ENABLE
668 config ARCH_SPARSEMEM_DEFAULT
669 def_bool y
670 depends on PPC_BOOK3S_64
672 config SYS_SUPPORTS_HUGETLBFS
673 bool
675 config ILLEGAL_POINTER_VALUE
676 hex
677 # This is roughly half way between the top of user space and the bottom
678 # of kernel space, which seems about as good as we can get.
679 default 0x5deadbeef0000000 if PPC64
680 default 0
682 config ARCH_MEMORY_PROBE
683 def_bool y
684 depends on MEMORY_HOTPLUG
686 # Some NUMA nodes have memory ranges that span
687 # other nodes. Even though a pfn is valid and
688 # between a node's start and end pfns, it may not
689 # reside on that node. See memmap_init_zone()
690 # for details.
691 config NODES_SPAN_OTHER_NODES
692 def_bool y
693 depends on NEED_MULTIPLE_NODES
695 config STDBINUTILS
696 bool "Using standard binutils settings"
697 depends on 44x
698 default y
699 help
700 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
701 Note, that kernel will be able to run only those applications,
702 which had been compiled using binutils later than 2.17.50.0.3 with
703 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
704 the older binutils, you can patch them with a trivial patch, which
705 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
707 choice
708 prompt "Page size"
709 default PPC_4K_PAGES
710 help
711 Select the kernel logical page size. Increasing the page size
712 will reduce software overhead at each page boundary, allow
713 hardware prefetch mechanisms to be more effective, and allow
714 larger dma transfers increasing IO efficiency and reducing
715 overhead. However the utilization of memory will increase.
716 For example, each cached file will using a multiple of the
717 page size to hold its contents and the difference between the
718 end of file and the end of page is wasted.
720 Some dedicated systems, such as software raid serving with
721 accelerated calculations, have shown significant increases.
723 If you configure a 64 bit kernel for 64k pages but the
724 processor does not support them, then the kernel will simulate
725 them with 4k pages, loading them on demand, but with the
726 reduced software overhead and larger internal fragmentation.
727 For the 32 bit kernel, a large page option will not be offered
728 unless it is supported by the configured processor.
730 If unsure, choose 4K_PAGES.
732 config PPC_4K_PAGES
733 bool "4k page size"
734 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
736 config PPC_16K_PAGES
737 bool "16k page size"
738 depends on 44x || PPC_8xx
740 config PPC_64K_PAGES
741 bool "64k page size"
742 depends on 44x || PPC_BOOK3S_64
743 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
745 config PPC_256K_PAGES
746 bool "256k page size"
747 depends on 44x && !STDBINUTILS
748 help
749 Make the page size 256k.
751 As the ELF standard only requires alignment to support page
752 sizes up to 64k, you will need to compile all of your user
753 space applications with a non-standard binutils settings
754 (see the STDBINUTILS description for details).
756 Say N unless you know what you are doing.
758 endchoice
760 config PPC_PAGE_SHIFT
761 int
762 default 18 if PPC_256K_PAGES
763 default 16 if PPC_64K_PAGES
764 default 14 if PPC_16K_PAGES
765 default 12
767 config THREAD_SHIFT
768 int "Thread shift" if EXPERT
769 range 13 15
770 default "15" if PPC_256K_PAGES
771 default "14" if PPC64
772 default "13"
773 help
774 Used to define the stack size. The default is almost always what you
775 want. Only change this if you know what you are doing.
777 config ETEXT_SHIFT_BOOL
778 bool "Set custom etext alignment" if STRICT_KERNEL_RWX && \
779 (PPC_BOOK3S_32 || PPC_8xx)
780 depends on ADVANCED_OPTIONS
781 help
782 This option allows you to set the kernel end of text alignment. When
783 RAM is mapped by blocks, the alignment needs to fit the size and
784 number of possible blocks. The default should be OK for most configs.
786 Say N here unless you know what you are doing.
788 config ETEXT_SHIFT
789 int "_etext shift" if ETEXT_SHIFT_BOOL
790 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
791 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
792 default 17 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
793 default 19 if STRICT_KERNEL_RWX && PPC_8xx
794 default PPC_PAGE_SHIFT
795 help
796 On Book3S 32 (603+), IBATs are used to map kernel text.
797 Smaller is the alignment, greater is the number of necessary IBATs.
799 On 8xx, large pages (512kb or 8M) are used to map kernel linear
800 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
801 in that case.
803 config DATA_SHIFT_BOOL
804 bool "Set custom data alignment" if STRICT_KERNEL_RWX && \
805 (PPC_BOOK3S_32 || PPC_8xx)
806 depends on ADVANCED_OPTIONS
807 help
808 This option allows you to set the kernel data alignment. When
809 RAM is mapped by blocks, the alignment needs to fit the size and
810 number of possible blocks. The default should be OK for most configs.
812 Say N here unless you know what you are doing.
814 config DATA_SHIFT
815 int "Data shift" if DATA_SHIFT_BOOL
816 default 24 if STRICT_KERNEL_RWX && PPC64
817 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
818 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
819 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
820 default 23 if STRICT_KERNEL_RWX && PPC_8xx
821 default PPC_PAGE_SHIFT
822 help
823 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
824 Smaller is the alignment, greater is the number of necessary DBATs.
826 On 8xx, large pages (512kb or 8M) are used to map kernel linear
827 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
828 in that case.
830 config FORCE_MAX_ZONEORDER
831 int "Maximum zone order"
832 range 8 9 if PPC64 && PPC_64K_PAGES
833 default "9" if PPC64 && PPC_64K_PAGES
834 range 13 13 if PPC64 && !PPC_64K_PAGES
835 default "13" if PPC64 && !PPC_64K_PAGES
836 range 9 64 if PPC32 && PPC_16K_PAGES
837 default "9" if PPC32 && PPC_16K_PAGES
838 range 7 64 if PPC32 && PPC_64K_PAGES
839 default "7" if PPC32 && PPC_64K_PAGES
840 range 5 64 if PPC32 && PPC_256K_PAGES
841 default "5" if PPC32 && PPC_256K_PAGES
842 range 11 64
843 default "11"
844 help
845 The kernel memory allocator divides physically contiguous memory
846 blocks into "zones", where each zone is a power of two number of
847 pages. This option selects the largest power of two that the kernel
848 keeps in the memory allocator. If you need to allocate very large
849 blocks of physically contiguous memory, then you may need to
850 increase this value.
852 This config option is actually maximum order plus one. For example,
853 a value of 11 means that the largest free memory block is 2^10 pages.
855 The page size is not necessarily 4KB. For example, on 64-bit
856 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
857 this in mind when choosing a value for this option.
859 config PPC_SUBPAGE_PROT
860 bool "Support setting protections for 4k subpages"
861 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
862 help
863 This option adds support for a system call to allow user programs
864 to set access permissions (read/write, readonly, or no access)
865 on the 4k subpages of each 64k page.
867 config PPC_COPRO_BASE
868 bool
870 config SCHED_SMT
871 bool "SMT (Hyperthreading) scheduler support"
872 depends on PPC64 && SMP
873 help
874 SMT scheduler support improves the CPU scheduler's decision making
875 when dealing with POWER5 cpus at a cost of slightly increased
876 overhead in some places. If unsure say N here.
878 config PPC_DENORMALISATION
879 bool "PowerPC denormalisation exception handling"
880 depends on PPC_BOOK3S_64
881 default "y" if PPC_POWERNV
882 help
883 Add support for handling denormalisation of single precision
884 values. Useful for bare metal only. If unsure say Y here.
886 config CMDLINE_BOOL
887 bool "Default bootloader kernel arguments"
889 config CMDLINE
890 string "Initial kernel command string" if CMDLINE_BOOL
891 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" if CMDLINE_BOOL
892 default ""
893 help
894 On some platforms, there is currently no way for the boot loader to
895 pass arguments to the kernel. For these platforms, you can supply
896 some command-line options at build time by entering them here. In
897 most cases you will need to specify the root device here.
899 choice
900 prompt "Kernel command line type" if CMDLINE != ""
901 default CMDLINE_FROM_BOOTLOADER
903 config CMDLINE_FROM_BOOTLOADER
904 bool "Use bootloader kernel arguments if available"
905 help
906 Uses the command-line options passed by the boot loader. If
907 the boot loader doesn't provide any, the default kernel command
908 string provided in CMDLINE will be used.
910 config CMDLINE_EXTEND
911 bool "Extend bootloader kernel arguments"
912 help
913 The command-line arguments provided by the boot loader will be
914 appended to the default kernel command string.
916 config CMDLINE_FORCE
917 bool "Always use the default kernel command string"
918 help
919 Always use the default kernel command string, even if the boot
920 loader passes other arguments to the kernel.
921 This is useful if you cannot or don't want to change the
922 command-line options your boot loader passes to the kernel.
924 endchoice
926 config EXTRA_TARGETS
927 string "Additional default image types"
928 help
929 List additional targets to be built by the bootwrapper here (separated
930 by spaces). This is useful for targets that depend of device tree
931 files in the .dts directory.
933 Targets in this list will be build as part of the default build
934 target, or when the user does a 'make zImage' or a
935 'make zImage.initrd'.
937 If unsure, leave blank
939 config ARCH_WANTS_FREEZER_CONTROL
940 def_bool y
941 depends on ADB_PMU
943 source "kernel/power/Kconfig"
945 config SECCOMP
946 bool "Enable seccomp to safely compute untrusted bytecode"
947 depends on PROC_FS
948 default y
949 help
950 This kernel feature is useful for number crunching applications
951 that may need to compute untrusted bytecode during their
952 execution. By using pipes or other transports made available to
953 the process as file descriptors supporting the read/write
954 syscalls, it's possible to isolate those applications in
955 their own address space using seccomp. Once seccomp is
956 enabled via /proc/<pid>/seccomp, it cannot be disabled
957 and the task is only allowed to execute a few safe syscalls
958 defined by each seccomp mode.
960 If unsure, say Y. Only embedded should say N here.
962 config PPC_MEM_KEYS
963 prompt "PowerPC Memory Protection Keys"
964 def_bool y
965 depends on PPC_BOOK3S_64
966 select ARCH_USES_HIGH_VMA_FLAGS
967 select ARCH_HAS_PKEYS
968 help
969 Memory Protection Keys provides a mechanism for enforcing
970 page-based protections, but without requiring modification of the
971 page tables when an application changes protection domains.
973 For details, see Documentation/core-api/protection-keys.rst
975 If unsure, say y.
977 config PPC_SECURE_BOOT
978 prompt "Enable secure boot support"
979 bool
980 depends on PPC_POWERNV
981 depends on IMA_ARCH_POLICY
982 help
983 Systems with firmware secure boot enabled need to define security
984 policies to extend secure boot to the OS. This config allows a user
985 to enable OS secure boot on systems that have firmware support for
986 it. If in doubt say N.
988 config PPC_SECVAR_SYSFS
989 bool "Enable sysfs interface for POWER secure variables"
990 default y
991 depends on PPC_SECURE_BOOT
992 depends on SYSFS
993 help
994 POWER secure variables are managed and controlled by firmware.
995 These variables are exposed to userspace via sysfs to enable
996 read/write operations on these variables. Say Y if you have
997 secure boot enabled and want to expose variables to userspace.
999 endmenu
1001 config ISA_DMA_API
1002 bool
1003 default PCI
1005 menu "Bus options"
1007 config ISA
1008 bool "Support for ISA-bus hardware"
1009 depends on PPC_CHRP
1010 select PPC_I8259
1011 help
1012 Find out whether you have ISA slots on your motherboard. ISA is the
1013 name of a bus system, i.e. the way the CPU talks to the other stuff
1014 inside your box. If you have an Apple machine, say N here; if you
1015 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1016 embedded board, consult your board documentation.
1018 config GENERIC_ISA_DMA
1019 bool
1020 depends on ISA_DMA_API
1021 default y
1023 config PPC_INDIRECT_PCI
1024 bool
1025 depends on PCI
1026 default y if 40x || 44x
1028 config SBUS
1029 bool
1031 config FSL_SOC
1032 bool
1034 config FSL_PCI
1035 bool
1036 select ARCH_HAS_DMA_SET_MASK
1037 select PPC_INDIRECT_PCI
1038 select PCI_QUIRKS
1040 config FSL_PMC
1041 bool
1042 default y
1043 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1044 help
1045 Freescale MPC85xx/MPC86xx power management controller support
1046 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1048 config PPC4xx_CPM
1049 bool
1050 default y
1051 depends on SUSPEND && (44x || 40x)
1052 help
1053 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1054 It also enables support for two different idle states (idle-wait
1055 and idle-doze).
1057 config 4xx_SOC
1058 bool
1060 config FSL_LBC
1061 bool "Freescale Local Bus support"
1062 help
1063 Enables reporting of errors from the Freescale local bus
1064 controller. Also contains some common code used by
1065 drivers for specific local bus peripherals.
1067 config FSL_GTM
1068 bool
1069 depends on PPC_83xx || QUICC_ENGINE || CPM2
1070 help
1071 Freescale General-purpose Timers support
1073 config PCI_8260
1074 bool
1075 depends on PCI && 8260
1076 select PPC_INDIRECT_PCI
1077 default y
1079 config FSL_RIO
1080 bool "Freescale Embedded SRIO Controller support"
1081 depends on RAPIDIO = y && HAVE_RAPIDIO
1082 default "n"
1083 help
1084 Include support for RapidIO controller on Freescale embedded
1085 processors (MPC8548, MPC8641, etc).
1087 endmenu
1089 config NONSTATIC_KERNEL
1090 bool
1092 menu "Advanced setup"
1093 depends on PPC32
1095 config ADVANCED_OPTIONS
1096 bool "Prompt for advanced kernel configuration options"
1097 help
1098 This option will enable prompting for a variety of advanced kernel
1099 configuration options. These options can cause the kernel to not
1100 work if they are set incorrectly, but can be used to optimize certain
1101 aspects of kernel memory management.
1103 Unless you know what you are doing, say N here.
1105 comment "Default settings for advanced configuration options are used"
1106 depends on !ADVANCED_OPTIONS
1108 config LOWMEM_SIZE_BOOL
1109 bool "Set maximum low memory"
1110 depends on ADVANCED_OPTIONS
1111 help
1112 This option allows you to set the maximum amount of memory which
1113 will be used as "low memory", that is, memory which the kernel can
1114 access directly, without having to set up a kernel virtual mapping.
1115 This can be useful in optimizing the layout of kernel virtual
1116 memory.
1118 Say N here unless you know what you are doing.
1120 config LOWMEM_SIZE
1121 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1122 default "0x30000000"
1124 config LOWMEM_CAM_NUM_BOOL
1125 bool "Set number of CAMs to use to map low memory"
1126 depends on ADVANCED_OPTIONS && FSL_BOOKE
1127 help
1128 This option allows you to set the maximum number of CAM slots that
1129 will be used to map low memory. There are a limited number of slots
1130 available and even more limited number that will fit in the L1 MMU.
1131 However, using more entries will allow mapping more low memory. This
1132 can be useful in optimizing the layout of kernel virtual memory.
1134 Say N here unless you know what you are doing.
1136 config LOWMEM_CAM_NUM
1137 depends on FSL_BOOKE
1138 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1139 default 3
1141 config DYNAMIC_MEMSTART
1142 bool "Enable page aligned dynamic load address for kernel"
1143 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1144 select NONSTATIC_KERNEL
1145 help
1146 This option enables the kernel to be loaded at any page aligned
1147 physical address. The kernel creates a mapping from KERNELBASE to
1148 the address where the kernel is loaded. The page size here implies
1149 the TLB page size of the mapping for kernel on the particular platform.
1150 Please refer to the init code for finding the TLB page size.
1152 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1153 kernel image, where the only restriction is the page aligned kernel
1154 load address. When this option is enabled, the compile time physical
1155 address CONFIG_PHYSICAL_START is ignored.
1157 This option is overridden by CONFIG_RELOCATABLE
1159 config PAGE_OFFSET_BOOL
1160 bool "Set custom page offset address"
1161 depends on ADVANCED_OPTIONS
1162 help
1163 This option allows you to set the kernel virtual address at which
1164 the kernel will map low memory. This can be useful in optimizing
1165 the virtual memory layout of the system.
1167 Say N here unless you know what you are doing.
1169 config PAGE_OFFSET
1170 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1171 default "0xc0000000"
1173 config KERNEL_START_BOOL
1174 bool "Set custom kernel base address"
1175 depends on ADVANCED_OPTIONS
1176 help
1177 This option allows you to set the kernel virtual address at which
1178 the kernel will be loaded. Normally this should match PAGE_OFFSET
1179 however there are times (like kdump) that one might not want them
1180 to be the same.
1182 Say N here unless you know what you are doing.
1184 config KERNEL_START
1185 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1186 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1187 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1188 default "0xc0000000"
1190 config PHYSICAL_START_BOOL
1191 bool "Set physical address where the kernel is loaded"
1192 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1193 help
1194 This gives the physical address where the kernel is loaded.
1196 Say N here unless you know what you are doing.
1198 config PHYSICAL_START
1199 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1200 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1201 default "0x00000000"
1203 config PHYSICAL_ALIGN
1204 hex
1205 default "0x04000000" if FSL_BOOKE
1206 help
1207 This value puts the alignment restrictions on physical address
1208 where kernel is loaded and run from. Kernel is compiled for an
1209 address which meets above alignment restriction.
1211 config TASK_SIZE_BOOL
1212 bool "Set custom user task size"
1213 depends on ADVANCED_OPTIONS
1214 help
1215 This option allows you to set the amount of virtual address space
1216 allocated to user tasks. This can be useful in optimizing the
1217 virtual memory layout of the system.
1219 Say N here unless you know what you are doing.
1221 config TASK_SIZE
1222 hex "Size of user task space" if TASK_SIZE_BOOL
1223 default "0x80000000" if PPC_8xx
1224 default "0xc0000000"
1226 config PIN_TLB
1227 bool "Pinned Kernel TLBs (860 ONLY)"
1228 depends on ADVANCED_OPTIONS && PPC_8xx && \
1229 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1231 config PIN_TLB_DATA
1232 bool "Pinned TLB for DATA"
1233 depends on PIN_TLB
1234 default y
1236 config PIN_TLB_IMMR
1237 bool "Pinned TLB for IMMR"
1238 depends on PIN_TLB || PPC_EARLY_DEBUG_CPM
1239 default y
1241 config PIN_TLB_TEXT
1242 bool "Pinned TLB for TEXT"
1243 depends on PIN_TLB
1244 default y
1245 endmenu
1247 if PPC64
1248 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1249 config PAGE_OFFSET
1250 hex
1251 default "0xc000000000000000"
1252 config KERNEL_START
1253 hex
1254 default "0xc000000000000000"
1255 config PHYSICAL_START
1256 hex
1257 default "0x00000000"
1258 endif
1260 config ARCH_RANDOM
1261 def_bool n
1263 config PPC_LIB_RHEAP
1264 bool
1266 source "arch/powerpc/kvm/Kconfig"
1268 source "kernel/livepatch/Kconfig"