| blob | 107bb4319e0e069547801826ae8b1dd3341f487b |
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 y if PPC64
64 config NEED_PER_CPU_PAGE_FIRST_CHUNK
65 def_bool y if PPC64
67 config NR_IRQS
68 int "Number of virtual interrupt numbers"
69 range 32 1048576
70 default "512"
71 help
72 This defines the number of virtual interrupt numbers the kernel
73 can manage. Virtual interrupt numbers are what you see in
74 /proc/interrupts. If you configure your system to have too few,
75 drivers will fail to load or worse - handle with care.
77 config NMI_IPI
78 bool
79 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
80 default y
82 config PPC_WATCHDOG
83 bool
84 depends on HARDLOCKUP_DETECTOR
85 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
86 default y
87 help
88 This is a placeholder when the powerpc hardlockup detector
89 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
90 selected via the generic lockup detector menu which is why we
91 have no standalone config option for it here.
93 config STACKTRACE_SUPPORT
94 bool
95 default y
97 config TRACE_IRQFLAGS_SUPPORT
98 bool
99 default y
101 config LOCKDEP_SUPPORT
102 bool
103 default y
105 config GENERIC_LOCKBREAK
106 bool
107 default y
108 depends on SMP && PREEMPTION
110 config GENERIC_HWEIGHT
111 bool
112 default y
114 config PPC
115 bool
116 default y
117 #
118 # Please keep this list sorted alphabetically.
119 #
120 select ARCH_32BIT_OFF_T if PPC32
121 select ARCH_HAS_DEBUG_VIRTUAL
122 select ARCH_HAS_DEVMEM_IS_ALLOWED
123 select ARCH_HAS_ELF_RANDOMIZE
124 select ARCH_HAS_FORTIFY_SOURCE
125 select ARCH_HAS_GCOV_PROFILE_ALL
126 select ARCH_HAS_KCOV
127 select ARCH_HAS_HUGEPD if HUGETLB_PAGE
128 select ARCH_HAS_MEMREMAP_COMPAT_ALIGN
129 select ARCH_HAS_MMIOWB if PPC64
130 select ARCH_HAS_PHYS_TO_DMA
131 select ARCH_HAS_PMEM_API
132 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
133 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
134 select ARCH_HAS_PTE_SPECIAL
135 select ARCH_HAS_MEMBARRIER_CALLBACKS
136 select ARCH_HAS_MEMBARRIER_SYNC_CORE
137 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
138 select ARCH_HAS_STRICT_KERNEL_RWX if (PPC32 && !HIBERNATION)
139 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
140 select ARCH_HAS_UACCESS_FLUSHCACHE
141 select ARCH_HAS_COPY_MC if PPC64
142 select ARCH_HAS_UBSAN_SANITIZE_ALL
143 select ARCH_HAVE_NMI_SAFE_CMPXCHG
144 select ARCH_KEEP_MEMBLOCK
145 select ARCH_MIGHT_HAVE_PC_PARPORT
146 select ARCH_MIGHT_HAVE_PC_SERIO
147 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
148 select ARCH_SUPPORTS_ATOMIC_RMW
149 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC32 || PPC_BOOK3S_64
150 select ARCH_USE_BUILTIN_BSWAP
151 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
152 select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS
153 select ARCH_USE_QUEUED_SPINLOCKS if PPC_QUEUED_SPINLOCKS
154 select ARCH_WANT_IPC_PARSE_VERSION
155 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
156 select ARCH_WANT_LD_ORPHAN_WARN
157 select ARCH_WEAK_RELEASE_ACQUIRE
158 select BINFMT_ELF
159 select BUILDTIME_TABLE_SORT
160 select CLONE_BACKWARDS
161 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
162 select DMA_OPS if PPC64
163 select DMA_OPS_BYPASS if PPC64
164 select ARCH_HAS_DMA_MAP_DIRECT if PPC64 && PPC_PSERIES
165 select DYNAMIC_FTRACE if FUNCTION_TRACER
166 select EDAC_ATOMIC_SCRUB
167 select EDAC_SUPPORT
168 select GENERIC_ATOMIC64 if PPC32
169 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
170 select GENERIC_CMOS_UPDATE
171 select GENERIC_CPU_AUTOPROBE
172 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
173 select GENERIC_EARLY_IOREMAP
174 select GENERIC_IRQ_SHOW
175 select GENERIC_IRQ_SHOW_LEVEL
176 select GENERIC_PCI_IOMAP if PCI
177 select GENERIC_SMP_IDLE_THREAD
178 select GENERIC_STRNCPY_FROM_USER
179 select GENERIC_STRNLEN_USER
180 select GENERIC_TIME_VSYSCALL
181 select GENERIC_GETTIMEOFDAY
182 select HAVE_ARCH_AUDITSYSCALL
183 select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
184 select HAVE_ARCH_JUMP_LABEL
185 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
186 select HAVE_ARCH_KASAN_VMALLOC if PPC32 && PPC_PAGE_SHIFT <= 14
187 select HAVE_ARCH_KGDB
188 select HAVE_ARCH_MMAP_RND_BITS
189 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
190 select HAVE_ARCH_NVRAM_OPS
191 select HAVE_ARCH_SECCOMP_FILTER
192 select HAVE_ARCH_TRACEHOOK
193 select HAVE_ASM_MODVERSIONS
194 select HAVE_C_RECORDMCOUNT
195 select HAVE_CBPF_JIT if !PPC64
196 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
197 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
198 select HAVE_CONTEXT_TRACKING if PPC64
199 select HAVE_TIF_NOHZ if PPC64
200 select HAVE_DEBUG_KMEMLEAK
201 select HAVE_DEBUG_STACKOVERFLOW
202 select HAVE_DYNAMIC_FTRACE
203 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
204 select HAVE_EBPF_JIT if PPC64
205 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
206 select HAVE_FAST_GUP
207 select HAVE_FTRACE_MCOUNT_RECORD
208 select HAVE_FUNCTION_ERROR_INJECTION
209 select HAVE_FUNCTION_GRAPH_TRACER
210 select HAVE_FUNCTION_TRACER
211 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
212 select HAVE_GENERIC_VDSO
213 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
214 select HAVE_IDE
215 select HAVE_IOREMAP_PROT
216 select HAVE_IRQ_EXIT_ON_IRQ_STACK
217 select HAVE_KERNEL_GZIP
218 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
219 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
220 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
221 select HAVE_KPROBES
222 select HAVE_KPROBES_ON_FTRACE
223 select HAVE_KRETPROBES
224 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
225 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
226 select HAVE_MOD_ARCH_SPECIFIC
227 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
228 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
229 select HAVE_OPROFILE
230 select HAVE_OPTPROBES if PPC64
231 select HAVE_PERF_EVENTS
232 select HAVE_PERF_EVENTS_NMI if PPC64
233 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
234 select HAVE_PERF_REGS
235 select HAVE_PERF_USER_STACK_DUMP
236 select MMU_GATHER_RCU_TABLE_FREE
237 select MMU_GATHER_PAGE_SIZE
238 select HAVE_REGS_AND_STACK_ACCESS_API
239 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
240 select HAVE_SYSCALL_TRACEPOINTS
241 select HAVE_VIRT_CPU_ACCOUNTING
242 select HAVE_IRQ_TIME_ACCOUNTING
243 select HAVE_RSEQ
244 select IOMMU_HELPER if PPC64
245 select IRQ_DOMAIN
246 select IRQ_FORCED_THREADING
247 select MODULES_USE_ELF_RELA
248 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
249 select NEED_SG_DMA_LENGTH
250 select OF
251 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
252 select OF_EARLY_FLATTREE
253 select OLD_SIGACTION if PPC32
254 select OLD_SIGSUSPEND
255 select PCI_DOMAINS if PCI
256 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
257 select PCI_SYSCALL if PCI
258 select PPC_DAWR if PPC64
259 select RTC_LIB
260 select SPARSE_IRQ
261 select SYSCTL_EXCEPTION_TRACE
262 select THREAD_INFO_IN_TASK
263 select VIRT_TO_BUS if !PPC64
264 #
265 # Please keep this list sorted alphabetically.
266 #
268 config PPC_BARRIER_NOSPEC
269 bool
270 default y
271 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
273 config EARLY_PRINTK
274 bool
275 default y
277 config PANIC_TIMEOUT
278 int
279 default 180
281 config COMPAT
282 bool "Enable support for 32bit binaries"
283 depends on PPC64
284 default y if !CPU_LITTLE_ENDIAN
285 select COMPAT_BINFMT_ELF
286 select ARCH_WANT_OLD_COMPAT_IPC
287 select COMPAT_OLD_SIGACTION
289 config SYSVIPC_COMPAT
290 bool
291 depends on COMPAT && SYSVIPC
292 default y
294 config SCHED_OMIT_FRAME_POINTER
295 bool
296 default y
298 config ARCH_MAY_HAVE_PC_FDC
299 bool
300 default PCI
302 config PPC_UDBG_16550
303 bool
305 config GENERIC_TBSYNC
306 bool
307 default y if PPC32 && SMP
309 config AUDIT_ARCH
310 bool
311 default y
313 config GENERIC_BUG
314 bool
315 default y
316 depends on BUG
318 config GENERIC_BUG_RELATIVE_POINTERS
319 def_bool y
320 depends on GENERIC_BUG
322 config SYS_SUPPORTS_APM_EMULATION
323 default y if PMAC_APM_EMU
324 bool
326 config EPAPR_BOOT
327 bool
328 help
329 Used to allow a board to specify it wants an ePAPR compliant wrapper.
331 config DEFAULT_UIMAGE
332 bool
333 help
334 Used to allow a board to specify it wants a uImage built by default
336 config ARCH_HIBERNATION_POSSIBLE
337 bool
338 default y
340 config ARCH_SUSPEND_POSSIBLE
341 def_bool y
342 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
343 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
344 || 44x || 40x
346 config ARCH_SUSPEND_NONZERO_CPU
347 def_bool y
348 depends on PPC_POWERNV || PPC_PSERIES
350 config PPC_DCR_NATIVE
351 bool
353 config PPC_DCR_MMIO
354 bool
356 config PPC_DCR
357 bool
358 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
359 default y
361 config PPC_OF_PLATFORM_PCI
362 bool
363 depends on PCI
364 depends on PPC64 # not supported on 32 bits yet
366 config ARCH_SUPPORTS_UPROBES
367 def_bool y
369 config PPC_ADV_DEBUG_REGS
370 bool
371 depends on 40x || BOOKE
372 default y
374 config PPC_ADV_DEBUG_IACS
375 int
376 depends on PPC_ADV_DEBUG_REGS
377 default 4 if 44x
378 default 2
380 config PPC_ADV_DEBUG_DACS
381 int
382 depends on PPC_ADV_DEBUG_REGS
383 default 2
385 config PPC_ADV_DEBUG_DVCS
386 int
387 depends on PPC_ADV_DEBUG_REGS
388 default 2 if 44x
389 default 0
391 config PPC_ADV_DEBUG_DAC_RANGE
392 bool
393 depends on PPC_ADV_DEBUG_REGS && 44x
394 default y
396 config PPC_DAWR
397 bool
399 config ZONE_DMA
400 bool
401 default y if PPC_BOOK3E_64
403 config PGTABLE_LEVELS
404 int
405 default 2 if !PPC64
406 default 4
408 source "arch/powerpc/sysdev/Kconfig"
409 source "arch/powerpc/platforms/Kconfig"
411 menu "Kernel options"
413 config HIGHMEM
414 bool "High memory support"
415 depends on PPC32
416 select KMAP_LOCAL
418 source "kernel/Kconfig.hz"
420 config HUGETLB_PAGE_SIZE_VARIABLE
421 bool
422 depends on HUGETLB_PAGE && PPC_BOOK3S_64
423 default y
425 config MATH_EMULATION
426 bool "Math emulation"
427 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
428 select PPC_FPU_REGS
429 help
430 Some PowerPC chips designed for embedded applications do not have
431 a floating-point unit and therefore do not implement the
432 floating-point instructions in the PowerPC instruction set. If you
433 say Y here, the kernel will include code to emulate a floating-point
434 unit, which will allow programs that use floating-point
435 instructions to run.
437 This is also useful to emulate missing (optional) instructions
438 such as fsqrt on cores that do have an FPU but do not implement
439 them (such as Freescale BookE).
441 choice
442 prompt "Math emulation options"
443 default MATH_EMULATION_FULL
444 depends on MATH_EMULATION
446 config MATH_EMULATION_FULL
447 bool "Emulate all the floating point instructions"
448 help
449 Select this option will enable the kernel to support to emulate
450 all the floating point instructions. If your SoC doesn't have
451 a FPU, you should select this.
453 config MATH_EMULATION_HW_UNIMPLEMENTED
454 bool "Just emulate the FPU unimplemented instructions"
455 help
456 Select this if you know there does have a hardware FPU on your
457 SoC, but some floating point instructions are not implemented by that.
459 endchoice
461 config PPC_TRANSACTIONAL_MEM
462 bool "Transactional Memory support for POWERPC"
463 depends on PPC_BOOK3S_64
464 depends on SMP
465 select ALTIVEC
466 select VSX
467 help
468 Support user-mode Transactional Memory on POWERPC.
470 config PPC_UV
471 bool "Ultravisor support"
472 depends on KVM_BOOK3S_HV_POSSIBLE
473 depends on DEVICE_PRIVATE
474 default n
475 help
476 This option paravirtualizes the kernel to run in POWER platforms that
477 supports the Protected Execution Facility (PEF). On such platforms,
478 the ultravisor firmware runs at a privilege level above the
479 hypervisor.
481 If unsure, say "N".
483 config LD_HEAD_STUB_CATCH
484 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
485 depends on PPC64
486 help
487 Very large kernels can cause linker branch stubs to be generated by
488 code in head_64.S, which moves the head text sections out of their
489 specified location. This option can work around the problem.
491 If unsure, say "N".
493 config MPROFILE_KERNEL
494 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
495 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
497 config HOTPLUG_CPU
498 bool "Support for enabling/disabling CPUs"
499 depends on SMP && (PPC_PSERIES || \
500 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
501 help
502 Say Y here to be able to disable and re-enable individual
503 CPUs at runtime on SMP machines.
505 Say N if you are unsure.
507 config PPC_QUEUED_SPINLOCKS
508 bool "Queued spinlocks"
509 depends on SMP
510 help
511 Say Y here to use queued spinlocks which give better scalability and
512 fairness on large SMP and NUMA systems without harming single threaded
513 performance.
515 This option is currently experimental, the code is more complex and
516 less tested so it defaults to "N" for the moment.
518 If unsure, say "N".
520 config ARCH_CPU_PROBE_RELEASE
521 def_bool y
522 depends on HOTPLUG_CPU
524 config ARCH_ENABLE_MEMORY_HOTPLUG
525 def_bool y
527 config ARCH_ENABLE_MEMORY_HOTREMOVE
528 def_bool y
530 config PPC64_SUPPORTS_MEMORY_FAILURE
531 bool "Add support for memory hwpoison"
532 depends on PPC_BOOK3S_64
533 default "y" if PPC_POWERNV
534 select ARCH_SUPPORTS_MEMORY_FAILURE
536 config KEXEC
537 bool "kexec system call"
538 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
539 select KEXEC_CORE
540 help
541 kexec is a system call that implements the ability to shutdown your
542 current kernel, and to start another kernel. It is like a reboot
543 but it is independent of the system firmware. And like a reboot
544 you can start any kernel with it, not just Linux.
546 The name comes from the similarity to the exec system call.
548 It is an ongoing process to be certain the hardware in a machine
549 is properly shutdown, so do not be surprised if this code does not
550 initially work for you. As of this writing the exact hardware
551 interface is strongly in flux, so no good recommendation can be
552 made.
554 config KEXEC_FILE
555 bool "kexec file based system call"
556 select KEXEC_CORE
557 select HAVE_IMA_KEXEC
558 select BUILD_BIN2C
559 select KEXEC_ELF
560 depends on PPC64
561 depends on CRYPTO=y
562 depends on CRYPTO_SHA256=y
563 help
564 This is a new version of the kexec system call. This call is
565 file based and takes in file descriptors as system call arguments
566 for kernel and initramfs as opposed to a list of segments as is the
567 case for the older kexec call.
569 config ARCH_HAS_KEXEC_PURGATORY
570 def_bool KEXEC_FILE
572 config RELOCATABLE
573 bool "Build a relocatable kernel"
574 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
575 select NONSTATIC_KERNEL
576 select MODULE_REL_CRCS if MODVERSIONS
577 help
578 This builds a kernel image that is capable of running at the
579 location the kernel is loaded at. For ppc32, there is no any
580 alignment restrictions, and this feature is a superset of
581 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
582 16k-aligned base address. The kernel is linked as a
583 position-independent executable (PIE) and contains dynamic relocations
584 which are processed early in the bootup process.
586 One use is for the kexec on panic case where the recovery kernel
587 must live at a different physical address than the primary
588 kernel.
590 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
591 it has been loaded at and the compile time physical addresses
592 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
593 setting can still be useful to bootwrappers that need to know the
594 load address of the kernel (eg. u-boot/mkimage).
596 config RANDOMIZE_BASE
597 bool "Randomize the address of the kernel image"
598 depends on (FSL_BOOKE && FLATMEM && PPC32)
599 depends on RELOCATABLE
600 help
601 Randomizes the virtual address at which the kernel image is
602 loaded, as a security feature that deters exploit attempts
603 relying on knowledge of the location of kernel internals.
605 If unsure, say Y.
607 config RELOCATABLE_TEST
608 bool "Test relocatable kernel"
609 depends on (PPC64 && RELOCATABLE)
610 help
611 This runs the relocatable kernel at the address it was initially
612 loaded at, which tends to be non-zero and therefore test the
613 relocation code.
615 config CRASH_DUMP
616 bool "Build a dump capture kernel"
617 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
618 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
619 help
620 Build a kernel suitable for use as a dump capture kernel.
621 The same kernel binary can be used as production kernel and dump
622 capture kernel.
624 config FA_DUMP
625 bool "Firmware-assisted dump"
626 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
627 select CRASH_CORE
628 select CRASH_DUMP
629 help
630 A robust mechanism to get reliable kernel crash dump with
631 assistance from firmware. This approach does not use kexec,
632 instead firmware assists in booting the capture kernel
633 while preserving memory contents. Firmware-assisted dump
634 is meant to be a kdump replacement offering robustness and
635 speed not possible without system firmware assistance.
637 If unsure, say "y". Only special kernels like petitboot may
638 need to say "N" here.
640 config PRESERVE_FA_DUMP
641 bool "Preserve Firmware-assisted dump"
642 depends on PPC64 && PPC_POWERNV && !FA_DUMP
643 help
644 On a kernel with FA_DUMP disabled, this option helps to preserve
645 crash data from a previously crash'ed kernel. Useful when the next
646 memory preserving kernel boot would process this crash data.
647 Petitboot kernel is the typical usecase for this option.
649 config OPAL_CORE
650 bool "Export OPAL memory as /sys/firmware/opal/core"
651 depends on PPC64 && PPC_POWERNV
652 help
653 This option uses the MPIPL support in firmware to provide an
654 ELF core of OPAL memory after a crash. The ELF core is exported
655 as /sys/firmware/opal/core file which is helpful in debugging
656 OPAL crashes using GDB.
658 config IRQ_ALL_CPUS
659 bool "Distribute interrupts on all CPUs by default"
660 depends on SMP
661 help
662 This option gives the kernel permission to distribute IRQs across
663 multiple CPUs. Saying N here will route all IRQs to the first
664 CPU. Generally saying Y is safe, although some problems have been
665 reported with SMP Power Macintoshes with this option enabled.
667 config NUMA
668 bool "NUMA Memory Allocation and Scheduler Support"
669 depends on PPC64 && SMP
670 default y if PPC_PSERIES || PPC_POWERNV
671 help
672 Enable NUMA (Non-Uniform Memory Access) support.
674 The kernel will try to allocate memory used by a CPU on the
675 local memory controller of the CPU and add some more
676 NUMA awareness to the kernel.
678 config NODES_SHIFT
679 int
680 default "8" if PPC64
681 default "4"
682 depends on NEED_MULTIPLE_NODES
684 config USE_PERCPU_NUMA_NODE_ID
685 def_bool y
686 depends on NUMA
688 config HAVE_MEMORYLESS_NODES
689 def_bool y
690 depends on NUMA
692 config ARCH_SELECT_MEMORY_MODEL
693 def_bool y
694 depends on PPC64
696 config ARCH_FLATMEM_ENABLE
697 def_bool y
698 depends on (PPC64 && !NUMA) || PPC32
700 config ARCH_SPARSEMEM_ENABLE
701 def_bool y
702 depends on PPC64
703 select SPARSEMEM_VMEMMAP_ENABLE
705 config ARCH_SPARSEMEM_DEFAULT
706 def_bool y
707 depends on PPC_BOOK3S_64
709 config SYS_SUPPORTS_HUGETLBFS
710 bool
712 config ILLEGAL_POINTER_VALUE
713 hex
714 # This is roughly half way between the top of user space and the bottom
715 # of kernel space, which seems about as good as we can get.
716 default 0x5deadbeef0000000 if PPC64
717 default 0
719 config ARCH_MEMORY_PROBE
720 def_bool y
721 depends on MEMORY_HOTPLUG
723 config STDBINUTILS
724 bool "Using standard binutils settings"
725 depends on 44x
726 default y
727 help
728 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
729 Note, that kernel will be able to run only those applications,
730 which had been compiled using binutils later than 2.17.50.0.3 with
731 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
732 the older binutils, you can patch them with a trivial patch, which
733 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
735 choice
736 prompt "Page size"
737 default PPC_4K_PAGES
738 help
739 Select the kernel logical page size. Increasing the page size
740 will reduce software overhead at each page boundary, allow
741 hardware prefetch mechanisms to be more effective, and allow
742 larger dma transfers increasing IO efficiency and reducing
743 overhead. However the utilization of memory will increase.
744 For example, each cached file will using a multiple of the
745 page size to hold its contents and the difference between the
746 end of file and the end of page is wasted.
748 Some dedicated systems, such as software raid serving with
749 accelerated calculations, have shown significant increases.
751 If you configure a 64 bit kernel for 64k pages but the
752 processor does not support them, then the kernel will simulate
753 them with 4k pages, loading them on demand, but with the
754 reduced software overhead and larger internal fragmentation.
755 For the 32 bit kernel, a large page option will not be offered
756 unless it is supported by the configured processor.
758 If unsure, choose 4K_PAGES.
760 config PPC_4K_PAGES
761 bool "4k page size"
762 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
764 config PPC_16K_PAGES
765 bool "16k page size"
766 depends on 44x || PPC_8xx
768 config PPC_64K_PAGES
769 bool "64k page size"
770 depends on 44x || PPC_BOOK3S_64
771 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
773 config PPC_256K_PAGES
774 bool "256k page size"
775 depends on 44x && !STDBINUTILS
776 help
777 Make the page size 256k.
779 As the ELF standard only requires alignment to support page
780 sizes up to 64k, you will need to compile all of your user
781 space applications with a non-standard binutils settings
782 (see the STDBINUTILS description for details).
784 Say N unless you know what you are doing.
786 endchoice
788 config PPC_PAGE_SHIFT
789 int
790 default 18 if PPC_256K_PAGES
791 default 16 if PPC_64K_PAGES
792 default 14 if PPC_16K_PAGES
793 default 12
795 config THREAD_SHIFT
796 int "Thread shift" if EXPERT
797 range 13 15
798 default "15" if PPC_256K_PAGES
799 default "14" if PPC64
800 default "14" if KASAN
801 default "13"
802 help
803 Used to define the stack size. The default is almost always what you
804 want. Only change this if you know what you are doing.
806 config DATA_SHIFT_BOOL
807 bool "Set custom data alignment"
808 depends on ADVANCED_OPTIONS
809 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC
810 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX)
811 help
812 This option allows you to set the kernel data alignment. When
813 RAM is mapped by blocks, the alignment needs to fit the size and
814 number of possible blocks. The default should be OK for most configs.
816 Say N here unless you know what you are doing.
818 config DATA_SHIFT
819 int "Data shift" if DATA_SHIFT_BOOL
820 default 24 if STRICT_KERNEL_RWX && PPC64
821 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_BOOK3S_32
822 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_8xx
823 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
824 default 18 if DEBUG_PAGEALLOC && PPC_BOOK3S_32
825 default 23 if STRICT_KERNEL_RWX && PPC_8xx
826 default 23 if DEBUG_PAGEALLOC && PPC_8xx && PIN_TLB_DATA
827 default 19 if DEBUG_PAGEALLOC && PPC_8xx
828 default PPC_PAGE_SHIFT
829 help
830 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
831 Smaller is the alignment, greater is the number of necessary DBATs.
833 On 8xx, large pages (512kb or 8M) are used to map kernel linear
834 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
835 in that case. If PIN_TLB is selected, it must be aligned to 8M as
836 8M pages will be pinned.
838 config FORCE_MAX_ZONEORDER
839 int "Maximum zone order"
840 range 8 9 if PPC64 && PPC_64K_PAGES
841 default "9" if PPC64 && PPC_64K_PAGES
842 range 13 13 if PPC64 && !PPC_64K_PAGES
843 default "13" if PPC64 && !PPC_64K_PAGES
844 range 9 64 if PPC32 && PPC_16K_PAGES
845 default "9" if PPC32 && PPC_16K_PAGES
846 range 7 64 if PPC32 && PPC_64K_PAGES
847 default "7" if PPC32 && PPC_64K_PAGES
848 range 5 64 if PPC32 && PPC_256K_PAGES
849 default "5" if PPC32 && PPC_256K_PAGES
850 range 11 64
851 default "11"
852 help
853 The kernel memory allocator divides physically contiguous memory
854 blocks into "zones", where each zone is a power of two number of
855 pages. This option selects the largest power of two that the kernel
856 keeps in the memory allocator. If you need to allocate very large
857 blocks of physically contiguous memory, then you may need to
858 increase this value.
860 This config option is actually maximum order plus one. For example,
861 a value of 11 means that the largest free memory block is 2^10 pages.
863 The page size is not necessarily 4KB. For example, on 64-bit
864 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
865 this in mind when choosing a value for this option.
867 config PPC_SUBPAGE_PROT
868 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
869 default n
870 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
871 help
872 This option adds support for system call to allow user programs
873 to set access permissions (read/write, readonly, or no access)
874 on the 4k subpages of each 64k page.
876 If unsure, say N here.
878 config PPC_PROT_SAO_LPAR
879 bool "Support PROT_SAO mappings in LPARs"
880 depends on PPC_BOOK3S_64
881 help
882 This option adds support for PROT_SAO mappings from userspace
883 inside LPARs on supported CPUs.
885 This may cause issues when performing guest migration from
886 a CPU that supports SAO to one that does not.
888 If unsure, say N here.
890 config PPC_COPRO_BASE
891 bool
893 config SCHED_SMT
894 bool "SMT (Hyperthreading) scheduler support"
895 depends on PPC64 && SMP
896 help
897 SMT scheduler support improves the CPU scheduler's decision making
898 when dealing with POWER5 cpus at a cost of slightly increased
899 overhead in some places. If unsure say N here.
901 config PPC_DENORMALISATION
902 bool "PowerPC denormalisation exception handling"
903 depends on PPC_BOOK3S_64
904 default "y" if PPC_POWERNV
905 help
906 Add support for handling denormalisation of single precision
907 values. Useful for bare metal only. If unsure say Y here.
909 config CMDLINE
910 string "Initial kernel command string"
911 default ""
912 help
913 On some platforms, there is currently no way for the boot loader to
914 pass arguments to the kernel. For these platforms, you can supply
915 some command-line options at build time by entering them here. In
916 most cases you will need to specify the root device here.
918 choice
919 prompt "Kernel command line type" if CMDLINE != ""
920 default CMDLINE_FROM_BOOTLOADER
922 config CMDLINE_FROM_BOOTLOADER
923 bool "Use bootloader kernel arguments if available"
924 help
925 Uses the command-line options passed by the boot loader. If
926 the boot loader doesn't provide any, the default kernel command
927 string provided in CMDLINE will be used.
929 config CMDLINE_EXTEND
930 bool "Extend bootloader kernel arguments"
931 help
932 The command-line arguments provided by the boot loader will be
933 appended to the default kernel command string.
935 config CMDLINE_FORCE
936 bool "Always use the default kernel command string"
937 help
938 Always use the default kernel command string, even if the boot
939 loader passes other arguments to the kernel.
940 This is useful if you cannot or don't want to change the
941 command-line options your boot loader passes to the kernel.
943 endchoice
945 config EXTRA_TARGETS
946 string "Additional default image types"
947 help
948 List additional targets to be built by the bootwrapper here (separated
949 by spaces). This is useful for targets that depend of device tree
950 files in the .dts directory.
952 Targets in this list will be build as part of the default build
953 target, or when the user does a 'make zImage' or a
954 'make zImage.initrd'.
956 If unsure, leave blank
958 config ARCH_WANTS_FREEZER_CONTROL
959 def_bool y
960 depends on ADB_PMU
962 source "kernel/power/Kconfig"
964 config PPC_MEM_KEYS
965 prompt "PowerPC Memory Protection Keys"
966 def_bool y
967 depends on PPC_BOOK3S_64
968 select ARCH_USES_HIGH_VMA_FLAGS
969 select ARCH_HAS_PKEYS
970 help
971 Memory Protection Keys provides a mechanism for enforcing
972 page-based protections, but without requiring modification of the
973 page tables when an application changes protection domains.
975 For details, see Documentation/core-api/protection-keys.rst
977 If unsure, say y.
979 config PPC_SECURE_BOOT
980 prompt "Enable secure boot support"
981 bool
982 depends on PPC_POWERNV || PPC_PSERIES
983 depends on IMA_ARCH_POLICY
984 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
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 config PPC_RTAS_FILTER
1003 bool "Enable filtering of RTAS syscalls"
1004 default y
1005 depends on PPC_RTAS
1006 help
1007 The RTAS syscall API has security issues that could be used to
1008 compromise system integrity. This option enforces restrictions on the
1009 RTAS calls and arguments passed by userspace programs to mitigate
1010 these issues.
1012 Say Y unless you know what you are doing and the filter is causing
1013 problems for you.
1015 endmenu
1017 config ISA_DMA_API
1018 bool
1019 default PCI
1021 menu "Bus options"
1023 config ISA
1024 bool "Support for ISA-bus hardware"
1025 depends on PPC_CHRP
1026 select PPC_I8259
1027 help
1028 Find out whether you have ISA slots on your motherboard. ISA is the
1029 name of a bus system, i.e. the way the CPU talks to the other stuff
1030 inside your box. If you have an Apple machine, say N here; if you
1031 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1032 embedded board, consult your board documentation.
1034 config GENERIC_ISA_DMA
1035 bool
1036 depends on ISA_DMA_API
1037 default y
1039 config PPC_INDIRECT_PCI
1040 bool
1041 depends on PCI
1042 default y if 40x || 44x
1044 config SBUS
1045 bool
1047 config FSL_SOC
1048 bool
1050 config FSL_PCI
1051 bool
1052 select ARCH_HAS_DMA_SET_MASK
1053 select PPC_INDIRECT_PCI
1054 select PCI_QUIRKS
1056 config FSL_PMC
1057 bool
1058 default y
1059 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1060 help
1061 Freescale MPC85xx/MPC86xx power management controller support
1062 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1064 config PPC4xx_CPM
1065 bool
1066 default y
1067 depends on SUSPEND && (44x || 40x)
1068 help
1069 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1070 It also enables support for two different idle states (idle-wait
1071 and idle-doze).
1073 config 4xx_SOC
1074 bool
1076 config FSL_LBC
1077 bool "Freescale Local Bus support"
1078 help
1079 Enables reporting of errors from the Freescale local bus
1080 controller. Also contains some common code used by
1081 drivers for specific local bus peripherals.
1083 config FSL_GTM
1084 bool
1085 depends on PPC_83xx || QUICC_ENGINE || CPM2
1086 help
1087 Freescale General-purpose Timers support
1089 config PCI_8260
1090 bool
1091 depends on PCI && 8260
1092 select PPC_INDIRECT_PCI
1093 default y
1095 config FSL_RIO
1096 bool "Freescale Embedded SRIO Controller support"
1097 depends on RAPIDIO = y && HAVE_RAPIDIO
1098 default "n"
1099 help
1100 Include support for RapidIO controller on Freescale embedded
1101 processors (MPC8548, MPC8641, etc).
1103 endmenu
1105 config NONSTATIC_KERNEL
1106 bool
1108 menu "Advanced setup"
1109 depends on PPC32
1111 config ADVANCED_OPTIONS
1112 bool "Prompt for advanced kernel configuration options"
1113 help
1114 This option will enable prompting for a variety of advanced kernel
1115 configuration options. These options can cause the kernel to not
1116 work if they are set incorrectly, but can be used to optimize certain
1117 aspects of kernel memory management.
1119 Unless you know what you are doing, say N here.
1121 comment "Default settings for advanced configuration options are used"
1122 depends on !ADVANCED_OPTIONS
1124 config LOWMEM_SIZE_BOOL
1125 bool "Set maximum low memory"
1126 depends on ADVANCED_OPTIONS
1127 help
1128 This option allows you to set the maximum amount of memory which
1129 will be used as "low memory", that is, memory which the kernel can
1130 access directly, without having to set up a kernel virtual mapping.
1131 This can be useful in optimizing the layout of kernel virtual
1132 memory.
1134 Say N here unless you know what you are doing.
1136 config LOWMEM_SIZE
1137 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1138 default "0x30000000"
1140 config LOWMEM_CAM_NUM_BOOL
1141 bool "Set number of CAMs to use to map low memory"
1142 depends on ADVANCED_OPTIONS && FSL_BOOKE
1143 help
1144 This option allows you to set the maximum number of CAM slots that
1145 will be used to map low memory. There are a limited number of slots
1146 available and even more limited number that will fit in the L1 MMU.
1147 However, using more entries will allow mapping more low memory. This
1148 can be useful in optimizing the layout of kernel virtual memory.
1150 Say N here unless you know what you are doing.
1152 config LOWMEM_CAM_NUM
1153 depends on FSL_BOOKE
1154 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1155 default 3
1157 config DYNAMIC_MEMSTART
1158 bool "Enable page aligned dynamic load address for kernel"
1159 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1160 select NONSTATIC_KERNEL
1161 help
1162 This option enables the kernel to be loaded at any page aligned
1163 physical address. The kernel creates a mapping from KERNELBASE to
1164 the address where the kernel is loaded. The page size here implies
1165 the TLB page size of the mapping for kernel on the particular platform.
1166 Please refer to the init code for finding the TLB page size.
1168 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1169 kernel image, where the only restriction is the page aligned kernel
1170 load address. When this option is enabled, the compile time physical
1171 address CONFIG_PHYSICAL_START is ignored.
1173 This option is overridden by CONFIG_RELOCATABLE
1175 config PAGE_OFFSET_BOOL
1176 bool "Set custom page offset address"
1177 depends on ADVANCED_OPTIONS
1178 help
1179 This option allows you to set the kernel virtual address at which
1180 the kernel will map low memory. This can be useful in optimizing
1181 the virtual memory layout of the system.
1183 Say N here unless you know what you are doing.
1185 config PAGE_OFFSET
1186 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1187 default "0xc0000000"
1189 config KERNEL_START_BOOL
1190 bool "Set custom kernel base address"
1191 depends on ADVANCED_OPTIONS
1192 help
1193 This option allows you to set the kernel virtual address at which
1194 the kernel will be loaded. Normally this should match PAGE_OFFSET
1195 however there are times (like kdump) that one might not want them
1196 to be the same.
1198 Say N here unless you know what you are doing.
1200 config KERNEL_START
1201 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1202 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1203 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1204 default "0xc0000000"
1206 config PHYSICAL_START_BOOL
1207 bool "Set physical address where the kernel is loaded"
1208 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1209 help
1210 This gives the physical address where the kernel is loaded.
1212 Say N here unless you know what you are doing.
1214 config PHYSICAL_START
1215 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1216 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1217 default "0x00000000"
1219 config PHYSICAL_ALIGN
1220 hex
1221 default "0x04000000" if FSL_BOOKE
1222 help
1223 This value puts the alignment restrictions on physical address
1224 where kernel is loaded and run from. Kernel is compiled for an
1225 address which meets above alignment restriction.
1227 config TASK_SIZE_BOOL
1228 bool "Set custom user task size"
1229 depends on ADVANCED_OPTIONS
1230 help
1231 This option allows you to set the amount of virtual address space
1232 allocated to user tasks. This can be useful in optimizing the
1233 virtual memory layout of the system.
1235 Say N here unless you know what you are doing.
1237 config TASK_SIZE
1238 hex "Size of user task space" if TASK_SIZE_BOOL
1239 default "0x80000000" if PPC_8xx
1240 default "0xb0000000" if PPC_BOOK3S_32 && STRICT_KERNEL_RWX
1241 default "0xc0000000"
1242 endmenu
1244 if PPC64
1245 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1246 config PAGE_OFFSET
1247 hex
1248 default "0xc000000000000000"
1249 config KERNEL_START
1250 hex
1251 default "0xc000000000000000"
1252 config PHYSICAL_START
1253 hex
1254 default "0x00000000"
1255 endif
1257 config ARCH_RANDOM
1258 def_bool n
1260 config PPC_LIB_RHEAP
1261 bool
1263 source "arch/powerpc/kvm/Kconfig"
1265 source "kernel/livepatch/Kconfig"