| blob | bf2b538aba12f86080cee25e7a506328b5b061ac |
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 GENERIC_LOCKBREAK
107 bool
108 default y
109 depends on SMP && PREEMPTION
111 config GENERIC_HWEIGHT
112 bool
113 default y
115 config PPC
116 bool
117 default y
118 #
119 # Please keep this list sorted alphabetically.
120 #
121 select ARCH_32BIT_OFF_T if PPC32
122 select ARCH_HAS_DEBUG_VIRTUAL
123 select ARCH_HAS_DEVMEM_IS_ALLOWED
124 select ARCH_HAS_ELF_RANDOMIZE
125 select ARCH_HAS_FORTIFY_SOURCE
126 select ARCH_HAS_GCOV_PROFILE_ALL
127 select ARCH_HAS_KCOV
128 select ARCH_HAS_HUGEPD if HUGETLB_PAGE
129 select ARCH_HAS_MMIOWB if PPC64
130 select ARCH_HAS_PHYS_TO_DMA
131 select ARCH_HAS_PMEM_API
132 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
133 select ARCH_HAS_PTE_SPECIAL
134 select ARCH_HAS_MEMBARRIER_CALLBACKS
135 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
136 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION)
137 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
138 select ARCH_HAS_UACCESS_FLUSHCACHE
139 select ARCH_HAS_UACCESS_MCSAFE if PPC64
140 select ARCH_HAS_UBSAN_SANITIZE_ALL
141 select ARCH_HAVE_NMI_SAFE_CMPXCHG
142 select ARCH_KEEP_MEMBLOCK
143 select ARCH_MIGHT_HAVE_PC_PARPORT
144 select ARCH_MIGHT_HAVE_PC_SERIO
145 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
146 select ARCH_SUPPORTS_ATOMIC_RMW
147 select ARCH_USE_BUILTIN_BSWAP
148 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
149 select ARCH_WANT_IPC_PARSE_VERSION
150 select ARCH_WEAK_RELEASE_ACQUIRE
151 select BINFMT_ELF
152 select BUILDTIME_TABLE_SORT
153 select CLONE_BACKWARDS
154 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
155 select DYNAMIC_FTRACE if FUNCTION_TRACER
156 select EDAC_ATOMIC_SCRUB
157 select EDAC_SUPPORT
158 select GENERIC_ATOMIC64 if PPC32
159 select GENERIC_CLOCKEVENTS
160 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
161 select GENERIC_CMOS_UPDATE
162 select GENERIC_CPU_AUTOPROBE
163 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
164 select GENERIC_EARLY_IOREMAP
165 select GENERIC_IRQ_SHOW
166 select GENERIC_IRQ_SHOW_LEVEL
167 select GENERIC_PCI_IOMAP if PCI
168 select GENERIC_SMP_IDLE_THREAD
169 select GENERIC_STRNCPY_FROM_USER
170 select GENERIC_STRNLEN_USER
171 select GENERIC_TIME_VSYSCALL
172 select HAVE_ARCH_AUDITSYSCALL
173 select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
174 select HAVE_ARCH_JUMP_LABEL
175 select HAVE_ARCH_KASAN if PPC32
176 select HAVE_ARCH_KGDB
177 select HAVE_ARCH_MMAP_RND_BITS
178 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
179 select HAVE_ARCH_NVRAM_OPS
180 select HAVE_ARCH_SECCOMP_FILTER
181 select HAVE_ARCH_TRACEHOOK
182 select HAVE_ASM_MODVERSIONS
183 select HAVE_C_RECORDMCOUNT
184 select HAVE_CBPF_JIT if !PPC64
185 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
186 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
187 select HAVE_CONTEXT_TRACKING if PPC64
188 select HAVE_COPY_THREAD_TLS
189 select HAVE_DEBUG_KMEMLEAK
190 select HAVE_DEBUG_STACKOVERFLOW
191 select HAVE_DYNAMIC_FTRACE
192 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
193 select HAVE_EBPF_JIT if PPC64
194 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
195 select HAVE_FAST_GUP
196 select HAVE_FTRACE_MCOUNT_RECORD
197 select HAVE_FUNCTION_ERROR_INJECTION
198 select HAVE_FUNCTION_GRAPH_TRACER
199 select HAVE_FUNCTION_TRACER
200 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
201 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
202 select HAVE_IDE
203 select HAVE_IOREMAP_PROT
204 select HAVE_IRQ_EXIT_ON_IRQ_STACK
205 select HAVE_KERNEL_GZIP
206 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
207 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
208 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
209 select HAVE_KPROBES
210 select HAVE_KPROBES_ON_FTRACE
211 select HAVE_KRETPROBES
212 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
213 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
214 select HAVE_MEMBLOCK_NODE_MAP
215 select HAVE_MOD_ARCH_SPECIFIC
216 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
217 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
218 select HAVE_OPROFILE
219 select HAVE_OPTPROBES if PPC64
220 select HAVE_PERF_EVENTS
221 select HAVE_PERF_EVENTS_NMI if PPC64
222 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
223 select HAVE_PERF_REGS
224 select HAVE_PERF_USER_STACK_DUMP
225 select MMU_GATHER_RCU_TABLE_FREE
226 select MMU_GATHER_PAGE_SIZE
227 select HAVE_REGS_AND_STACK_ACCESS_API
228 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
229 select HAVE_SYSCALL_TRACEPOINTS
230 select HAVE_VIRT_CPU_ACCOUNTING
231 select HAVE_IRQ_TIME_ACCOUNTING
232 select HAVE_RSEQ
233 select IOMMU_HELPER if PPC64
234 select IRQ_DOMAIN
235 select IRQ_FORCED_THREADING
236 select MODULES_USE_ELF_RELA
237 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
238 select NEED_SG_DMA_LENGTH
239 select OF
240 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
241 select OF_EARLY_FLATTREE
242 select OLD_SIGACTION if PPC32
243 select OLD_SIGSUSPEND
244 select PCI_DOMAINS if PCI
245 select PCI_SYSCALL if PCI
246 select PPC_DAWR if PPC64
247 select RTC_LIB
248 select SPARSE_IRQ
249 select SYSCTL_EXCEPTION_TRACE
250 select THREAD_INFO_IN_TASK
251 select VIRT_TO_BUS if !PPC64
252 #
253 # Please keep this list sorted alphabetically.
254 #
256 config PPC_BARRIER_NOSPEC
257 bool
258 default y
259 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
261 config EARLY_PRINTK
262 bool
263 default y
265 config PANIC_TIMEOUT
266 int
267 default 180
269 config COMPAT
270 bool
271 default y if PPC64
272 select COMPAT_BINFMT_ELF
273 select ARCH_WANT_OLD_COMPAT_IPC
274 select COMPAT_OLD_SIGACTION
276 config SYSVIPC_COMPAT
277 bool
278 depends on COMPAT && SYSVIPC
279 default y
281 config SCHED_OMIT_FRAME_POINTER
282 bool
283 default y
285 config ARCH_MAY_HAVE_PC_FDC
286 bool
287 default PCI
289 config PPC_UDBG_16550
290 bool
292 config GENERIC_TBSYNC
293 bool
294 default y if PPC32 && SMP
296 config AUDIT_ARCH
297 bool
298 default y
300 config GENERIC_BUG
301 bool
302 default y
303 depends on BUG
305 config SYS_SUPPORTS_APM_EMULATION
306 default y if PMAC_APM_EMU
307 bool
309 config EPAPR_BOOT
310 bool
311 help
312 Used to allow a board to specify it wants an ePAPR compliant wrapper.
314 config DEFAULT_UIMAGE
315 bool
316 help
317 Used to allow a board to specify it wants a uImage built by default
319 config ARCH_HIBERNATION_POSSIBLE
320 bool
321 default y
323 config ARCH_SUSPEND_POSSIBLE
324 def_bool y
325 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
326 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
327 || 44x || 40x
329 config ARCH_SUSPEND_NONZERO_CPU
330 def_bool y
331 depends on PPC_POWERNV || PPC_PSERIES
333 config PPC_DCR_NATIVE
334 bool
336 config PPC_DCR_MMIO
337 bool
339 config PPC_DCR
340 bool
341 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
342 default y
344 config PPC_OF_PLATFORM_PCI
345 bool
346 depends on PCI
347 depends on PPC64 # not supported on 32 bits yet
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 PPC_DAWR
384 bool
386 config ZONE_DMA
387 bool
388 default y if PPC_BOOK3E_64
390 config PGTABLE_LEVELS
391 int
392 default 2 if !PPC64
393 default 4
395 source "arch/powerpc/sysdev/Kconfig"
396 source "arch/powerpc/platforms/Kconfig"
398 menu "Kernel options"
400 config HIGHMEM
401 bool "High memory support"
402 depends on PPC32
404 source "kernel/Kconfig.hz"
406 config HUGETLB_PAGE_SIZE_VARIABLE
407 bool
408 depends on HUGETLB_PAGE && PPC_BOOK3S_64
409 default y
411 config MATH_EMULATION
412 bool "Math emulation"
413 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
414 help
415 Some PowerPC chips designed for embedded applications do not have
416 a floating-point unit and therefore do not implement the
417 floating-point instructions in the PowerPC instruction set. If you
418 say Y here, the kernel will include code to emulate a floating-point
419 unit, which will allow programs that use floating-point
420 instructions to run.
422 This is also useful to emulate missing (optional) instructions
423 such as fsqrt on cores that do have an FPU but do not implement
424 them (such as Freescale BookE).
426 choice
427 prompt "Math emulation options"
428 default MATH_EMULATION_FULL
429 depends on MATH_EMULATION
431 config MATH_EMULATION_FULL
432 bool "Emulate all the floating point instructions"
433 help
434 Select this option will enable the kernel to support to emulate
435 all the floating point instructions. If your SoC doesn't have
436 a FPU, you should select this.
438 config MATH_EMULATION_HW_UNIMPLEMENTED
439 bool "Just emulate the FPU unimplemented instructions"
440 help
441 Select this if you know there does have a hardware FPU on your
442 SoC, but some floating point instructions are not implemented by that.
444 endchoice
446 config PPC_TRANSACTIONAL_MEM
447 bool "Transactional Memory support for POWERPC"
448 depends on PPC_BOOK3S_64
449 depends on SMP
450 select ALTIVEC
451 select VSX
452 help
453 Support user-mode Transactional Memory on POWERPC.
455 config PPC_UV
456 bool "Ultravisor support"
457 depends on KVM_BOOK3S_HV_POSSIBLE
458 depends on DEVICE_PRIVATE
459 default n
460 help
461 This option paravirtualizes the kernel to run in POWER platforms that
462 supports the Protected Execution Facility (PEF). On such platforms,
463 the ultravisor firmware runs at a privilege level above the
464 hypervisor.
466 If unsure, say "N".
468 config LD_HEAD_STUB_CATCH
469 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
470 depends on PPC64
471 help
472 Very large kernels can cause linker branch stubs to be generated by
473 code in head_64.S, which moves the head text sections out of their
474 specified location. This option can work around the problem.
476 If unsure, say "N".
478 config MPROFILE_KERNEL
479 depends on PPC64 && CPU_LITTLE_ENDIAN
480 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
482 config HOTPLUG_CPU
483 bool "Support for enabling/disabling CPUs"
484 depends on SMP && (PPC_PSERIES || \
485 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
486 help
487 Say Y here to be able to disable and re-enable individual
488 CPUs at runtime on SMP machines.
490 Say N if you are unsure.
492 config ARCH_CPU_PROBE_RELEASE
493 def_bool y
494 depends on HOTPLUG_CPU
496 config ARCH_ENABLE_MEMORY_HOTPLUG
497 def_bool y
499 config ARCH_ENABLE_MEMORY_HOTREMOVE
500 def_bool y
502 config PPC64_SUPPORTS_MEMORY_FAILURE
503 bool "Add support for memory hwpoison"
504 depends on PPC_BOOK3S_64
505 default "y" if PPC_POWERNV
506 select ARCH_SUPPORTS_MEMORY_FAILURE
508 config KEXEC
509 bool "kexec system call"
510 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
511 select KEXEC_CORE
512 help
513 kexec is a system call that implements the ability to shutdown your
514 current kernel, and to start another kernel. It is like a reboot
515 but it is independent of the system firmware. And like a reboot
516 you can start any kernel with it, not just Linux.
518 The name comes from the similarity to the exec system call.
520 It is an ongoing process to be certain the hardware in a machine
521 is properly shutdown, so do not be surprised if this code does not
522 initially work for you. As of this writing the exact hardware
523 interface is strongly in flux, so no good recommendation can be
524 made.
526 config KEXEC_FILE
527 bool "kexec file based system call"
528 select KEXEC_CORE
529 select HAVE_IMA_KEXEC
530 select BUILD_BIN2C
531 select KEXEC_ELF
532 depends on PPC64
533 depends on CRYPTO=y
534 depends on CRYPTO_SHA256=y
535 help
536 This is a new version of the kexec system call. This call is
537 file based and takes in file descriptors as system call arguments
538 for kernel and initramfs as opposed to a list of segments as is the
539 case for the older kexec call.
541 config ARCH_HAS_KEXEC_PURGATORY
542 def_bool KEXEC_FILE
544 config RELOCATABLE
545 bool "Build a relocatable kernel"
546 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
547 select NONSTATIC_KERNEL
548 select MODULE_REL_CRCS if MODVERSIONS
549 help
550 This builds a kernel image that is capable of running at the
551 location the kernel is loaded at. For ppc32, there is no any
552 alignment restrictions, and this feature is a superset of
553 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
554 16k-aligned base address. The kernel is linked as a
555 position-independent executable (PIE) and contains dynamic relocations
556 which are processed early in the bootup process.
558 One use is for the kexec on panic case where the recovery kernel
559 must live at a different physical address than the primary
560 kernel.
562 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
563 it has been loaded at and the compile time physical addresses
564 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
565 setting can still be useful to bootwrappers that need to know the
566 load address of the kernel (eg. u-boot/mkimage).
568 config RANDOMIZE_BASE
569 bool "Randomize the address of the kernel image"
570 depends on (FSL_BOOKE && FLATMEM && PPC32)
571 depends on RELOCATABLE
572 help
573 Randomizes the virtual address at which the kernel image is
574 loaded, as a security feature that deters exploit attempts
575 relying on knowledge of the location of kernel internals.
577 If unsure, say Y.
579 config RELOCATABLE_TEST
580 bool "Test relocatable kernel"
581 depends on (PPC64 && RELOCATABLE)
582 help
583 This runs the relocatable kernel at the address it was initially
584 loaded at, which tends to be non-zero and therefore test the
585 relocation code.
587 config CRASH_DUMP
588 bool "Build a dump capture kernel"
589 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
590 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
591 help
592 Build a kernel suitable for use as a dump capture kernel.
593 The same kernel binary can be used as production kernel and dump
594 capture kernel.
596 config FA_DUMP
597 bool "Firmware-assisted dump"
598 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
599 select CRASH_CORE
600 select CRASH_DUMP
601 help
602 A robust mechanism to get reliable kernel crash dump with
603 assistance from firmware. This approach does not use kexec,
604 instead firmware assists in booting the capture kernel
605 while preserving memory contents. Firmware-assisted dump
606 is meant to be a kdump replacement offering robustness and
607 speed not possible without system firmware assistance.
609 If unsure, say "y". Only special kernels like petitboot may
610 need to say "N" here.
612 config PRESERVE_FA_DUMP
613 bool "Preserve Firmware-assisted dump"
614 depends on PPC64 && PPC_POWERNV && !FA_DUMP
615 help
616 On a kernel with FA_DUMP disabled, this option helps to preserve
617 crash data from a previously crash'ed kernel. Useful when the next
618 memory preserving kernel boot would process this crash data.
619 Petitboot kernel is the typical usecase for this option.
621 config OPAL_CORE
622 bool "Export OPAL memory as /sys/firmware/opal/core"
623 depends on PPC64 && PPC_POWERNV
624 help
625 This option uses the MPIPL support in firmware to provide an
626 ELF core of OPAL memory after a crash. The ELF core is exported
627 as /sys/firmware/opal/core file which is helpful in debugging
628 OPAL crashes using GDB.
630 config IRQ_ALL_CPUS
631 bool "Distribute interrupts on all CPUs by default"
632 depends on SMP
633 help
634 This option gives the kernel permission to distribute IRQs across
635 multiple CPUs. Saying N here will route all IRQs to the first
636 CPU. Generally saying Y is safe, although some problems have been
637 reported with SMP Power Macintoshes with this option enabled.
639 config NUMA
640 bool "NUMA support"
641 depends on PPC64
642 default y if SMP && PPC_PSERIES
644 config NODES_SHIFT
645 int
646 default "8" if PPC64
647 default "4"
648 depends on NEED_MULTIPLE_NODES
650 config USE_PERCPU_NUMA_NODE_ID
651 def_bool y
652 depends on NUMA
654 config HAVE_MEMORYLESS_NODES
655 def_bool y
656 depends on NUMA
658 config ARCH_SELECT_MEMORY_MODEL
659 def_bool y
660 depends on PPC64
662 config ARCH_FLATMEM_ENABLE
663 def_bool y
664 depends on (PPC64 && !NUMA) || PPC32
666 config ARCH_SPARSEMEM_ENABLE
667 def_bool y
668 depends on PPC64
669 select SPARSEMEM_VMEMMAP_ENABLE
671 config ARCH_SPARSEMEM_DEFAULT
672 def_bool y
673 depends on PPC_BOOK3S_64
675 config SYS_SUPPORTS_HUGETLBFS
676 bool
678 config ILLEGAL_POINTER_VALUE
679 hex
680 # This is roughly half way between the top of user space and the bottom
681 # of kernel space, which seems about as good as we can get.
682 default 0x5deadbeef0000000 if PPC64
683 default 0
685 config ARCH_MEMORY_PROBE
686 def_bool y
687 depends on MEMORY_HOTPLUG
689 # Some NUMA nodes have memory ranges that span
690 # other nodes. Even though a pfn is valid and
691 # between a node's start and end pfns, it may not
692 # reside on that node. See memmap_init_zone()
693 # for details.
694 config NODES_SPAN_OTHER_NODES
695 def_bool y
696 depends on NEED_MULTIPLE_NODES
698 config STDBINUTILS
699 bool "Using standard binutils settings"
700 depends on 44x
701 default y
702 help
703 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
704 Note, that kernel will be able to run only those applications,
705 which had been compiled using binutils later than 2.17.50.0.3 with
706 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
707 the older binutils, you can patch them with a trivial patch, which
708 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
710 choice
711 prompt "Page size"
712 default PPC_4K_PAGES
713 help
714 Select the kernel logical page size. Increasing the page size
715 will reduce software overhead at each page boundary, allow
716 hardware prefetch mechanisms to be more effective, and allow
717 larger dma transfers increasing IO efficiency and reducing
718 overhead. However the utilization of memory will increase.
719 For example, each cached file will using a multiple of the
720 page size to hold its contents and the difference between the
721 end of file and the end of page is wasted.
723 Some dedicated systems, such as software raid serving with
724 accelerated calculations, have shown significant increases.
726 If you configure a 64 bit kernel for 64k pages but the
727 processor does not support them, then the kernel will simulate
728 them with 4k pages, loading them on demand, but with the
729 reduced software overhead and larger internal fragmentation.
730 For the 32 bit kernel, a large page option will not be offered
731 unless it is supported by the configured processor.
733 If unsure, choose 4K_PAGES.
735 config PPC_4K_PAGES
736 bool "4k page size"
737 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
739 config PPC_16K_PAGES
740 bool "16k page size"
741 depends on 44x || PPC_8xx
743 config PPC_64K_PAGES
744 bool "64k page size"
745 depends on 44x || PPC_BOOK3S_64
746 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
748 config PPC_256K_PAGES
749 bool "256k page size"
750 depends on 44x && !STDBINUTILS
751 help
752 Make the page size 256k.
754 As the ELF standard only requires alignment to support page
755 sizes up to 64k, you will need to compile all of your user
756 space applications with a non-standard binutils settings
757 (see the STDBINUTILS description for details).
759 Say N unless you know what you are doing.
761 endchoice
763 config PPC_PAGE_SHIFT
764 int
765 default 18 if PPC_256K_PAGES
766 default 16 if PPC_64K_PAGES
767 default 14 if PPC_16K_PAGES
768 default 12
770 config THREAD_SHIFT
771 int "Thread shift" if EXPERT
772 range 13 15
773 default "15" if PPC_256K_PAGES
774 default "14" if PPC64
775 default "13"
776 help
777 Used to define the stack size. The default is almost always what you
778 want. Only change this if you know what you are doing.
780 config ETEXT_SHIFT_BOOL
781 bool "Set custom etext alignment" if STRICT_KERNEL_RWX && \
782 (PPC_BOOK3S_32 || PPC_8xx)
783 depends on ADVANCED_OPTIONS
784 help
785 This option allows you to set the kernel end of text alignment. When
786 RAM is mapped by blocks, the alignment needs to fit the size and
787 number of possible blocks. The default should be OK for most configs.
789 Say N here unless you know what you are doing.
791 config ETEXT_SHIFT
792 int "_etext shift" if ETEXT_SHIFT_BOOL
793 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
794 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
795 default 17 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
796 default 19 if STRICT_KERNEL_RWX && PPC_8xx
797 default PPC_PAGE_SHIFT
798 help
799 On Book3S 32 (603+), IBATs are used to map kernel text.
800 Smaller is the alignment, greater is the number of necessary IBATs.
802 On 8xx, large pages (512kb or 8M) are used to map kernel linear
803 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
804 in that case.
806 config DATA_SHIFT_BOOL
807 bool "Set custom data alignment" if STRICT_KERNEL_RWX && \
808 (PPC_BOOK3S_32 || PPC_8xx)
809 depends on ADVANCED_OPTIONS
810 help
811 This option allows you to set the kernel data alignment. When
812 RAM is mapped by blocks, the alignment needs to fit the size and
813 number of possible blocks. The default should be OK for most configs.
815 Say N here unless you know what you are doing.
817 config DATA_SHIFT
818 int "Data shift" if DATA_SHIFT_BOOL
819 default 24 if STRICT_KERNEL_RWX && PPC64
820 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
821 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
822 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
823 default 23 if STRICT_KERNEL_RWX && PPC_8xx
824 default PPC_PAGE_SHIFT
825 help
826 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
827 Smaller is the alignment, greater is the number of necessary DBATs.
829 On 8xx, large pages (512kb or 8M) are used to map kernel linear
830 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
831 in that case.
833 config FORCE_MAX_ZONEORDER
834 int "Maximum zone order"
835 range 8 9 if PPC64 && PPC_64K_PAGES
836 default "9" if PPC64 && PPC_64K_PAGES
837 range 13 13 if PPC64 && !PPC_64K_PAGES
838 default "13" if PPC64 && !PPC_64K_PAGES
839 range 9 64 if PPC32 && PPC_16K_PAGES
840 default "9" if PPC32 && PPC_16K_PAGES
841 range 7 64 if PPC32 && PPC_64K_PAGES
842 default "7" if PPC32 && PPC_64K_PAGES
843 range 5 64 if PPC32 && PPC_256K_PAGES
844 default "5" if PPC32 && PPC_256K_PAGES
845 range 11 64
846 default "11"
847 help
848 The kernel memory allocator divides physically contiguous memory
849 blocks into "zones", where each zone is a power of two number of
850 pages. This option selects the largest power of two that the kernel
851 keeps in the memory allocator. If you need to allocate very large
852 blocks of physically contiguous memory, then you may need to
853 increase this value.
855 This config option is actually maximum order plus one. For example,
856 a value of 11 means that the largest free memory block is 2^10 pages.
858 The page size is not necessarily 4KB. For example, on 64-bit
859 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
860 this in mind when choosing a value for this option.
862 config PPC_SUBPAGE_PROT
863 bool "Support setting protections for 4k subpages"
864 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
865 help
866 This option adds support for a system call to allow user programs
867 to set access permissions (read/write, readonly, or no access)
868 on the 4k subpages of each 64k page.
870 config PPC_COPRO_BASE
871 bool
873 config SCHED_SMT
874 bool "SMT (Hyperthreading) scheduler support"
875 depends on PPC64 && SMP
876 help
877 SMT scheduler support improves the CPU scheduler's decision making
878 when dealing with POWER5 cpus at a cost of slightly increased
879 overhead in some places. If unsure say N here.
881 config PPC_DENORMALISATION
882 bool "PowerPC denormalisation exception handling"
883 depends on PPC_BOOK3S_64
884 default "y" if PPC_POWERNV
885 help
886 Add support for handling denormalisation of single precision
887 values. Useful for bare metal only. If unsure say Y here.
889 config CMDLINE_BOOL
890 bool "Default bootloader kernel arguments"
892 config CMDLINE
893 string "Initial kernel command string" if CMDLINE_BOOL
894 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" if CMDLINE_BOOL
895 default ""
896 help
897 On some platforms, there is currently no way for the boot loader to
898 pass arguments to the kernel. For these platforms, you can supply
899 some command-line options at build time by entering them here. In
900 most cases you will need to specify the root device here.
902 choice
903 prompt "Kernel command line type" if CMDLINE != ""
904 default CMDLINE_FROM_BOOTLOADER
906 config CMDLINE_FROM_BOOTLOADER
907 bool "Use bootloader kernel arguments if available"
908 help
909 Uses the command-line options passed by the boot loader. If
910 the boot loader doesn't provide any, the default kernel command
911 string provided in CMDLINE will be used.
913 config CMDLINE_EXTEND
914 bool "Extend bootloader kernel arguments"
915 help
916 The command-line arguments provided by the boot loader will be
917 appended to the default kernel command string.
919 config CMDLINE_FORCE
920 bool "Always use the default kernel command string"
921 help
922 Always use the default kernel command string, even if the boot
923 loader passes other arguments to the kernel.
924 This is useful if you cannot or don't want to change the
925 command-line options your boot loader passes to the kernel.
927 endchoice
929 config EXTRA_TARGETS
930 string "Additional default image types"
931 help
932 List additional targets to be built by the bootwrapper here (separated
933 by spaces). This is useful for targets that depend of device tree
934 files in the .dts directory.
936 Targets in this list will be build as part of the default build
937 target, or when the user does a 'make zImage' or a
938 'make zImage.initrd'.
940 If unsure, leave blank
942 config ARCH_WANTS_FREEZER_CONTROL
943 def_bool y
944 depends on ADB_PMU
946 source "kernel/power/Kconfig"
948 config SECCOMP
949 bool "Enable seccomp to safely compute untrusted bytecode"
950 depends on PROC_FS
951 default y
952 help
953 This kernel feature is useful for number crunching applications
954 that may need to compute untrusted bytecode during their
955 execution. By using pipes or other transports made available to
956 the process as file descriptors supporting the read/write
957 syscalls, it's possible to isolate those applications in
958 their own address space using seccomp. Once seccomp is
959 enabled via /proc/<pid>/seccomp, it cannot be disabled
960 and the task is only allowed to execute a few safe syscalls
961 defined by each seccomp mode.
963 If unsure, say Y. Only embedded should say N here.
965 config PPC_MEM_KEYS
966 prompt "PowerPC Memory Protection Keys"
967 def_bool y
968 depends on PPC_BOOK3S_64
969 select ARCH_USES_HIGH_VMA_FLAGS
970 select ARCH_HAS_PKEYS
971 help
972 Memory Protection Keys provides a mechanism for enforcing
973 page-based protections, but without requiring modification of the
974 page tables when an application changes protection domains.
976 For details, see Documentation/core-api/protection-keys.rst
978 If unsure, say y.
980 config PPC_SECURE_BOOT
981 prompt "Enable secure boot support"
982 bool
983 depends on PPC_POWERNV
984 depends on IMA_ARCH_POLICY
985 help
986 Systems with firmware secure boot enabled need to define security
987 policies to extend secure boot to the OS. This config allows a user
988 to enable OS secure boot on systems that have firmware support for
989 it. If in doubt say N.
991 config PPC_SECVAR_SYSFS
992 bool "Enable sysfs interface for POWER secure variables"
993 default y
994 depends on PPC_SECURE_BOOT
995 depends on SYSFS
996 help
997 POWER secure variables are managed and controlled by firmware.
998 These variables are exposed to userspace via sysfs to enable
999 read/write operations on these variables. Say Y if you have
1000 secure boot enabled and want to expose variables to userspace.
1002 endmenu
1004 config ISA_DMA_API
1005 bool
1006 default PCI
1008 menu "Bus options"
1010 config ISA
1011 bool "Support for ISA-bus hardware"
1012 depends on PPC_CHRP
1013 select PPC_I8259
1014 help
1015 Find out whether you have ISA slots on your motherboard. ISA is the
1016 name of a bus system, i.e. the way the CPU talks to the other stuff
1017 inside your box. If you have an Apple machine, say N here; if you
1018 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1019 embedded board, consult your board documentation.
1021 config GENERIC_ISA_DMA
1022 bool
1023 depends on ISA_DMA_API
1024 default y
1026 config PPC_INDIRECT_PCI
1027 bool
1028 depends on PCI
1029 default y if 40x || 44x
1031 config SBUS
1032 bool
1034 config FSL_SOC
1035 bool
1037 config FSL_PCI
1038 bool
1039 select ARCH_HAS_DMA_SET_MASK
1040 select PPC_INDIRECT_PCI
1041 select PCI_QUIRKS
1043 config FSL_PMC
1044 bool
1045 default y
1046 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1047 help
1048 Freescale MPC85xx/MPC86xx power management controller support
1049 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1051 config PPC4xx_CPM
1052 bool
1053 default y
1054 depends on SUSPEND && (44x || 40x)
1055 help
1056 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1057 It also enables support for two different idle states (idle-wait
1058 and idle-doze).
1060 config 4xx_SOC
1061 bool
1063 config FSL_LBC
1064 bool "Freescale Local Bus support"
1065 help
1066 Enables reporting of errors from the Freescale local bus
1067 controller. Also contains some common code used by
1068 drivers for specific local bus peripherals.
1070 config FSL_GTM
1071 bool
1072 depends on PPC_83xx || QUICC_ENGINE || CPM2
1073 help
1074 Freescale General-purpose Timers support
1076 config PCI_8260
1077 bool
1078 depends on PCI && 8260
1079 select PPC_INDIRECT_PCI
1080 default y
1082 config FSL_RIO
1083 bool "Freescale Embedded SRIO Controller support"
1084 depends on RAPIDIO = y && HAVE_RAPIDIO
1085 default "n"
1086 help
1087 Include support for RapidIO controller on Freescale embedded
1088 processors (MPC8548, MPC8641, etc).
1090 endmenu
1092 config NONSTATIC_KERNEL
1093 bool
1095 menu "Advanced setup"
1096 depends on PPC32
1098 config ADVANCED_OPTIONS
1099 bool "Prompt for advanced kernel configuration options"
1100 help
1101 This option will enable prompting for a variety of advanced kernel
1102 configuration options. These options can cause the kernel to not
1103 work if they are set incorrectly, but can be used to optimize certain
1104 aspects of kernel memory management.
1106 Unless you know what you are doing, say N here.
1108 comment "Default settings for advanced configuration options are used"
1109 depends on !ADVANCED_OPTIONS
1111 config LOWMEM_SIZE_BOOL
1112 bool "Set maximum low memory"
1113 depends on ADVANCED_OPTIONS
1114 help
1115 This option allows you to set the maximum amount of memory which
1116 will be used as "low memory", that is, memory which the kernel can
1117 access directly, without having to set up a kernel virtual mapping.
1118 This can be useful in optimizing the layout of kernel virtual
1119 memory.
1121 Say N here unless you know what you are doing.
1123 config LOWMEM_SIZE
1124 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1125 default "0x30000000"
1127 config LOWMEM_CAM_NUM_BOOL
1128 bool "Set number of CAMs to use to map low memory"
1129 depends on ADVANCED_OPTIONS && FSL_BOOKE
1130 help
1131 This option allows you to set the maximum number of CAM slots that
1132 will be used to map low memory. There are a limited number of slots
1133 available and even more limited number that will fit in the L1 MMU.
1134 However, using more entries will allow mapping more low memory. This
1135 can be useful in optimizing the layout of kernel virtual memory.
1137 Say N here unless you know what you are doing.
1139 config LOWMEM_CAM_NUM
1140 depends on FSL_BOOKE
1141 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1142 default 3
1144 config DYNAMIC_MEMSTART
1145 bool "Enable page aligned dynamic load address for kernel"
1146 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1147 select NONSTATIC_KERNEL
1148 help
1149 This option enables the kernel to be loaded at any page aligned
1150 physical address. The kernel creates a mapping from KERNELBASE to
1151 the address where the kernel is loaded. The page size here implies
1152 the TLB page size of the mapping for kernel on the particular platform.
1153 Please refer to the init code for finding the TLB page size.
1155 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1156 kernel image, where the only restriction is the page aligned kernel
1157 load address. When this option is enabled, the compile time physical
1158 address CONFIG_PHYSICAL_START is ignored.
1160 This option is overridden by CONFIG_RELOCATABLE
1162 config PAGE_OFFSET_BOOL
1163 bool "Set custom page offset address"
1164 depends on ADVANCED_OPTIONS
1165 help
1166 This option allows you to set the kernel virtual address at which
1167 the kernel will map low memory. This can be useful in optimizing
1168 the virtual memory layout of the system.
1170 Say N here unless you know what you are doing.
1172 config PAGE_OFFSET
1173 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1174 default "0xc0000000"
1176 config KERNEL_START_BOOL
1177 bool "Set custom kernel base address"
1178 depends on ADVANCED_OPTIONS
1179 help
1180 This option allows you to set the kernel virtual address at which
1181 the kernel will be loaded. Normally this should match PAGE_OFFSET
1182 however there are times (like kdump) that one might not want them
1183 to be the same.
1185 Say N here unless you know what you are doing.
1187 config KERNEL_START
1188 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1189 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1190 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1191 default "0xc0000000"
1193 config PHYSICAL_START_BOOL
1194 bool "Set physical address where the kernel is loaded"
1195 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1196 help
1197 This gives the physical address where the kernel is loaded.
1199 Say N here unless you know what you are doing.
1201 config PHYSICAL_START
1202 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1203 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1204 default "0x00000000"
1206 config PHYSICAL_ALIGN
1207 hex
1208 default "0x04000000" if FSL_BOOKE
1209 help
1210 This value puts the alignment restrictions on physical address
1211 where kernel is loaded and run from. Kernel is compiled for an
1212 address which meets above alignment restriction.
1214 config TASK_SIZE_BOOL
1215 bool "Set custom user task size"
1216 depends on ADVANCED_OPTIONS
1217 help
1218 This option allows you to set the amount of virtual address space
1219 allocated to user tasks. This can be useful in optimizing the
1220 virtual memory layout of the system.
1222 Say N here unless you know what you are doing.
1224 config TASK_SIZE
1225 hex "Size of user task space" if TASK_SIZE_BOOL
1226 default "0x80000000" if PPC_8xx
1227 default "0xc0000000"
1229 config PIN_TLB
1230 bool "Pinned Kernel TLBs (860 ONLY)"
1231 depends on ADVANCED_OPTIONS && PPC_8xx && \
1232 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1234 config PIN_TLB_DATA
1235 bool "Pinned TLB for DATA"
1236 depends on PIN_TLB
1237 default y
1239 config PIN_TLB_IMMR
1240 bool "Pinned TLB for IMMR"
1241 depends on PIN_TLB || PPC_EARLY_DEBUG_CPM
1242 default y
1244 config PIN_TLB_TEXT
1245 bool "Pinned TLB for TEXT"
1246 depends on PIN_TLB
1247 default y
1248 endmenu
1250 if PPC64
1251 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1252 config PAGE_OFFSET
1253 hex
1254 default "0xc000000000000000"
1255 config KERNEL_START
1256 hex
1257 default "0xc000000000000000"
1258 config PHYSICAL_START
1259 hex
1260 default "0x00000000"
1261 endif
1263 config ARCH_RANDOM
1264 def_bool n
1266 config PPC_LIB_RHEAP
1267 bool
1269 source "arch/powerpc/kvm/Kconfig"
1271 source "kernel/livepatch/Kconfig"