1 # SPDX-License-Identifier: GPL-2.0
2 source "arch/powerpc/platforms/Kconfig.cputype"
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
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)
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)
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)
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
61 config NEED_PER_CPU_EMBED_FIRST_CHUNK
64 config NEED_PER_CPU_PAGE_FIRST_CHUNK
68 int "Number of virtual interrupt numbers"
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.
79 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
84 depends on HARDLOCKUP_DETECTOR
85 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
88 This is a placeholder when the powerpc hardlockup detector
89 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
90 seleted via the generic lockup detector menu which is why we
91 have no standalone config option for it here.
93 config STACKTRACE_SUPPORT
97 config TRACE_IRQFLAGS_SUPPORT
101 config LOCKDEP_SUPPORT
105 config GENERIC_LOCKBREAK
108 depends on SMP && PREEMPTION
110 config GENERIC_HWEIGHT
118 # Please keep this list sorted alphabetically.
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
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
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 DYNAMIC_FTRACE if FUNCTION_TRACER
165 select EDAC_ATOMIC_SCRUB
167 select GENERIC_ATOMIC64 if PPC32
168 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
169 select GENERIC_CMOS_UPDATE
170 select GENERIC_CPU_AUTOPROBE
171 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
172 select GENERIC_EARLY_IOREMAP
173 select GENERIC_IRQ_SHOW
174 select GENERIC_IRQ_SHOW_LEVEL
175 select GENERIC_PCI_IOMAP if PCI
176 select GENERIC_SMP_IDLE_THREAD
177 select GENERIC_STRNCPY_FROM_USER
178 select GENERIC_STRNLEN_USER
179 select GENERIC_TIME_VSYSCALL
180 select HAVE_ARCH_AUDITSYSCALL
181 select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
182 select HAVE_ARCH_JUMP_LABEL
183 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
184 select HAVE_ARCH_KASAN_VMALLOC if PPC32 && PPC_PAGE_SHIFT <= 14
185 select HAVE_ARCH_KGDB
186 select HAVE_ARCH_MMAP_RND_BITS
187 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
188 select HAVE_ARCH_NVRAM_OPS
189 select HAVE_ARCH_SECCOMP_FILTER
190 select HAVE_ARCH_TRACEHOOK
191 select HAVE_ASM_MODVERSIONS
192 select HAVE_C_RECORDMCOUNT
193 select HAVE_CBPF_JIT if !PPC64
194 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
195 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
196 select HAVE_CONTEXT_TRACKING if PPC64
197 select HAVE_TIF_NOHZ if PPC64
198 select HAVE_DEBUG_KMEMLEAK
199 select HAVE_DEBUG_STACKOVERFLOW
200 select HAVE_DYNAMIC_FTRACE
201 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
202 select HAVE_EBPF_JIT if PPC64
203 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
205 select HAVE_FTRACE_MCOUNT_RECORD
206 select HAVE_FUNCTION_ERROR_INJECTION
207 select HAVE_FUNCTION_GRAPH_TRACER
208 select HAVE_FUNCTION_TRACER
209 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
210 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
212 select HAVE_IOREMAP_PROT
213 select HAVE_IRQ_EXIT_ON_IRQ_STACK
214 select HAVE_KERNEL_GZIP
215 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
216 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
217 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
219 select HAVE_KPROBES_ON_FTRACE
220 select HAVE_KRETPROBES
221 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
222 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
223 select HAVE_MOD_ARCH_SPECIFIC
224 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
225 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
227 select HAVE_OPTPROBES if PPC64
228 select HAVE_PERF_EVENTS
229 select HAVE_PERF_EVENTS_NMI if PPC64
230 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
231 select HAVE_PERF_REGS
232 select HAVE_PERF_USER_STACK_DUMP
233 select MMU_GATHER_RCU_TABLE_FREE
234 select MMU_GATHER_PAGE_SIZE
235 select HAVE_REGS_AND_STACK_ACCESS_API
236 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
237 select HAVE_SYSCALL_TRACEPOINTS
238 select HAVE_VIRT_CPU_ACCOUNTING
239 select HAVE_IRQ_TIME_ACCOUNTING
241 select IOMMU_HELPER if PPC64
243 select IRQ_FORCED_THREADING
244 select MODULES_USE_ELF_RELA
245 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
246 select NEED_SG_DMA_LENGTH
248 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
249 select OF_EARLY_FLATTREE
250 select OLD_SIGACTION if PPC32
251 select OLD_SIGSUSPEND
252 select PCI_DOMAINS if PCI
253 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
254 select PCI_SYSCALL if PCI
255 select PPC_DAWR if PPC64
258 select SYSCTL_EXCEPTION_TRACE
259 select THREAD_INFO_IN_TASK
260 select VIRT_TO_BUS if !PPC64
262 # Please keep this list sorted alphabetically.
265 config PPC_BARRIER_NOSPEC
268 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
279 bool "Enable support for 32bit binaries"
281 default y if !CPU_LITTLE_ENDIAN
282 select COMPAT_BINFMT_ELF
283 select ARCH_WANT_OLD_COMPAT_IPC
284 select COMPAT_OLD_SIGACTION
286 config SYSVIPC_COMPAT
288 depends on COMPAT && SYSVIPC
291 config SCHED_OMIT_FRAME_POINTER
295 config ARCH_MAY_HAVE_PC_FDC
299 config PPC_UDBG_16550
302 config GENERIC_TBSYNC
304 default y if PPC32 && SMP
315 config SYS_SUPPORTS_APM_EMULATION
316 default y if PMAC_APM_EMU
322 Used to allow a board to specify it wants an ePAPR compliant wrapper.
324 config DEFAULT_UIMAGE
327 Used to allow a board to specify it wants a uImage built by default
329 config ARCH_HIBERNATION_POSSIBLE
333 config ARCH_SUSPEND_POSSIBLE
335 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
336 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
339 config ARCH_SUSPEND_NONZERO_CPU
341 depends on PPC_POWERNV || PPC_PSERIES
343 config PPC_DCR_NATIVE
351 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
354 config PPC_OF_PLATFORM_PCI
357 depends on PPC64 # not supported on 32 bits yet
359 config ARCH_SUPPORTS_UPROBES
362 config PPC_ADV_DEBUG_REGS
364 depends on 40x || BOOKE
367 config PPC_ADV_DEBUG_IACS
369 depends on PPC_ADV_DEBUG_REGS
373 config PPC_ADV_DEBUG_DACS
375 depends on PPC_ADV_DEBUG_REGS
378 config PPC_ADV_DEBUG_DVCS
380 depends on PPC_ADV_DEBUG_REGS
384 config PPC_ADV_DEBUG_DAC_RANGE
386 depends on PPC_ADV_DEBUG_REGS && 44x
394 default y if PPC_BOOK3E_64
396 config PGTABLE_LEVELS
401 source "arch/powerpc/sysdev/Kconfig"
402 source "arch/powerpc/platforms/Kconfig"
404 menu "Kernel options"
407 bool "High memory support"
411 source "kernel/Kconfig.hz"
413 config HUGETLB_PAGE_SIZE_VARIABLE
415 depends on HUGETLB_PAGE && PPC_BOOK3S_64
418 config MATH_EMULATION
419 bool "Math emulation"
420 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
422 Some PowerPC chips designed for embedded applications do not have
423 a floating-point unit and therefore do not implement the
424 floating-point instructions in the PowerPC instruction set. If you
425 say Y here, the kernel will include code to emulate a floating-point
426 unit, which will allow programs that use floating-point
429 This is also useful to emulate missing (optional) instructions
430 such as fsqrt on cores that do have an FPU but do not implement
431 them (such as Freescale BookE).
434 prompt "Math emulation options"
435 default MATH_EMULATION_FULL
436 depends on MATH_EMULATION
438 config MATH_EMULATION_FULL
439 bool "Emulate all the floating point instructions"
441 Select this option will enable the kernel to support to emulate
442 all the floating point instructions. If your SoC doesn't have
443 a FPU, you should select this.
445 config MATH_EMULATION_HW_UNIMPLEMENTED
446 bool "Just emulate the FPU unimplemented instructions"
448 Select this if you know there does have a hardware FPU on your
449 SoC, but some floating point instructions are not implemented by that.
453 config PPC_TRANSACTIONAL_MEM
454 bool "Transactional Memory support for POWERPC"
455 depends on PPC_BOOK3S_64
460 Support user-mode Transactional Memory on POWERPC.
463 bool "Ultravisor support"
464 depends on KVM_BOOK3S_HV_POSSIBLE
465 depends on DEVICE_PRIVATE
468 This option paravirtualizes the kernel to run in POWER platforms that
469 supports the Protected Execution Facility (PEF). On such platforms,
470 the ultravisor firmware runs at a privilege level above the
475 config LD_HEAD_STUB_CATCH
476 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
479 Very large kernels can cause linker branch stubs to be generated by
480 code in head_64.S, which moves the head text sections out of their
481 specified location. This option can work around the problem.
485 config MPROFILE_KERNEL
486 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
487 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
490 bool "Support for enabling/disabling CPUs"
491 depends on SMP && (PPC_PSERIES || \
492 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
494 Say Y here to be able to disable and re-enable individual
495 CPUs at runtime on SMP machines.
497 Say N if you are unsure.
499 config PPC_QUEUED_SPINLOCKS
500 bool "Queued spinlocks"
503 Say Y here to use queued spinlocks which give better scalability and
504 fairness on large SMP and NUMA systems without harming single threaded
507 This option is currently experimental, the code is more complex and
508 less tested so it defaults to "N" for the moment.
512 config ARCH_CPU_PROBE_RELEASE
514 depends on HOTPLUG_CPU
516 config ARCH_ENABLE_MEMORY_HOTPLUG
519 config ARCH_ENABLE_MEMORY_HOTREMOVE
522 config PPC64_SUPPORTS_MEMORY_FAILURE
523 bool "Add support for memory hwpoison"
524 depends on PPC_BOOK3S_64
525 default "y" if PPC_POWERNV
526 select ARCH_SUPPORTS_MEMORY_FAILURE
529 bool "kexec system call"
530 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
533 kexec is a system call that implements the ability to shutdown your
534 current kernel, and to start another kernel. It is like a reboot
535 but it is independent of the system firmware. And like a reboot
536 you can start any kernel with it, not just Linux.
538 The name comes from the similarity to the exec system call.
540 It is an ongoing process to be certain the hardware in a machine
541 is properly shutdown, so do not be surprised if this code does not
542 initially work for you. As of this writing the exact hardware
543 interface is strongly in flux, so no good recommendation can be
547 bool "kexec file based system call"
549 select HAVE_IMA_KEXEC
554 depends on CRYPTO_SHA256=y
556 This is a new version of the kexec system call. This call is
557 file based and takes in file descriptors as system call arguments
558 for kernel and initramfs as opposed to a list of segments as is the
559 case for the older kexec call.
561 config ARCH_HAS_KEXEC_PURGATORY
565 bool "Build a relocatable kernel"
566 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
567 select NONSTATIC_KERNEL
568 select MODULE_REL_CRCS if MODVERSIONS
570 This builds a kernel image that is capable of running at the
571 location the kernel is loaded at. For ppc32, there is no any
572 alignment restrictions, and this feature is a superset of
573 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
574 16k-aligned base address. The kernel is linked as a
575 position-independent executable (PIE) and contains dynamic relocations
576 which are processed early in the bootup process.
578 One use is for the kexec on panic case where the recovery kernel
579 must live at a different physical address than the primary
582 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
583 it has been loaded at and the compile time physical addresses
584 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
585 setting can still be useful to bootwrappers that need to know the
586 load address of the kernel (eg. u-boot/mkimage).
588 config RANDOMIZE_BASE
589 bool "Randomize the address of the kernel image"
590 depends on (FSL_BOOKE && FLATMEM && PPC32)
591 depends on RELOCATABLE
593 Randomizes the virtual address at which the kernel image is
594 loaded, as a security feature that deters exploit attempts
595 relying on knowledge of the location of kernel internals.
599 config RELOCATABLE_TEST
600 bool "Test relocatable kernel"
601 depends on (PPC64 && RELOCATABLE)
603 This runs the relocatable kernel at the address it was initially
604 loaded at, which tends to be non-zero and therefore test the
608 bool "Build a dump capture kernel"
609 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
610 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
612 Build a kernel suitable for use as a dump capture kernel.
613 The same kernel binary can be used as production kernel and dump
617 bool "Firmware-assisted dump"
618 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
622 A robust mechanism to get reliable kernel crash dump with
623 assistance from firmware. This approach does not use kexec,
624 instead firmware assists in booting the capture kernel
625 while preserving memory contents. Firmware-assisted dump
626 is meant to be a kdump replacement offering robustness and
627 speed not possible without system firmware assistance.
629 If unsure, say "y". Only special kernels like petitboot may
630 need to say "N" here.
632 config PRESERVE_FA_DUMP
633 bool "Preserve Firmware-assisted dump"
634 depends on PPC64 && PPC_POWERNV && !FA_DUMP
636 On a kernel with FA_DUMP disabled, this option helps to preserve
637 crash data from a previously crash'ed kernel. Useful when the next
638 memory preserving kernel boot would process this crash data.
639 Petitboot kernel is the typical usecase for this option.
642 bool "Export OPAL memory as /sys/firmware/opal/core"
643 depends on PPC64 && PPC_POWERNV
645 This option uses the MPIPL support in firmware to provide an
646 ELF core of OPAL memory after a crash. The ELF core is exported
647 as /sys/firmware/opal/core file which is helpful in debugging
648 OPAL crashes using GDB.
651 bool "Distribute interrupts on all CPUs by default"
654 This option gives the kernel permission to distribute IRQs across
655 multiple CPUs. Saying N here will route all IRQs to the first
656 CPU. Generally saying Y is safe, although some problems have been
657 reported with SMP Power Macintoshes with this option enabled.
662 default y if SMP && PPC_PSERIES
668 depends on NEED_MULTIPLE_NODES
670 config USE_PERCPU_NUMA_NODE_ID
674 config HAVE_MEMORYLESS_NODES
678 config ARCH_SELECT_MEMORY_MODEL
682 config ARCH_FLATMEM_ENABLE
684 depends on (PPC64 && !NUMA) || PPC32
686 config ARCH_SPARSEMEM_ENABLE
689 select SPARSEMEM_VMEMMAP_ENABLE
691 config ARCH_SPARSEMEM_DEFAULT
693 depends on PPC_BOOK3S_64
695 config SYS_SUPPORTS_HUGETLBFS
698 config ILLEGAL_POINTER_VALUE
700 # This is roughly half way between the top of user space and the bottom
701 # of kernel space, which seems about as good as we can get.
702 default 0x5deadbeef0000000 if PPC64
705 config ARCH_MEMORY_PROBE
707 depends on MEMORY_HOTPLUG
710 bool "Using standard binutils settings"
714 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
715 Note, that kernel will be able to run only those applications,
716 which had been compiled using binutils later than 2.17.50.0.3 with
717 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
718 the older binutils, you can patch them with a trivial patch, which
719 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
725 Select the kernel logical page size. Increasing the page size
726 will reduce software overhead at each page boundary, allow
727 hardware prefetch mechanisms to be more effective, and allow
728 larger dma transfers increasing IO efficiency and reducing
729 overhead. However the utilization of memory will increase.
730 For example, each cached file will using a multiple of the
731 page size to hold its contents and the difference between the
732 end of file and the end of page is wasted.
734 Some dedicated systems, such as software raid serving with
735 accelerated calculations, have shown significant increases.
737 If you configure a 64 bit kernel for 64k pages but the
738 processor does not support them, then the kernel will simulate
739 them with 4k pages, loading them on demand, but with the
740 reduced software overhead and larger internal fragmentation.
741 For the 32 bit kernel, a large page option will not be offered
742 unless it is supported by the configured processor.
744 If unsure, choose 4K_PAGES.
748 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
752 depends on 44x || PPC_8xx
756 depends on 44x || PPC_BOOK3S_64
757 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
759 config PPC_256K_PAGES
760 bool "256k page size"
761 depends on 44x && !STDBINUTILS
763 Make the page size 256k.
765 As the ELF standard only requires alignment to support page
766 sizes up to 64k, you will need to compile all of your user
767 space applications with a non-standard binutils settings
768 (see the STDBINUTILS description for details).
770 Say N unless you know what you are doing.
774 config PPC_PAGE_SHIFT
776 default 18 if PPC_256K_PAGES
777 default 16 if PPC_64K_PAGES
778 default 14 if PPC_16K_PAGES
782 int "Thread shift" if EXPERT
784 default "15" if PPC_256K_PAGES
785 default "14" if PPC64
786 default "14" if KASAN
789 Used to define the stack size. The default is almost always what you
790 want. Only change this if you know what you are doing.
792 config DATA_SHIFT_BOOL
793 bool "Set custom data alignment"
794 depends on ADVANCED_OPTIONS
795 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC
796 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && \
797 (!PIN_TLB_TEXT || !STRICT_KERNEL_RWX))
799 This option allows you to set the kernel data alignment. When
800 RAM is mapped by blocks, the alignment needs to fit the size and
801 number of possible blocks. The default should be OK for most configs.
803 Say N here unless you know what you are doing.
806 int "Data shift" if DATA_SHIFT_BOOL
807 default 24 if STRICT_KERNEL_RWX && PPC64
808 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_BOOK3S_32
809 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_8xx
810 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
811 default 18 if DEBUG_PAGEALLOC && PPC_BOOK3S_32
812 default 23 if STRICT_KERNEL_RWX && PPC_8xx
813 default 23 if DEBUG_PAGEALLOC && PPC_8xx && PIN_TLB_DATA
814 default 19 if DEBUG_PAGEALLOC && PPC_8xx
815 default PPC_PAGE_SHIFT
817 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
818 Smaller is the alignment, greater is the number of necessary DBATs.
820 On 8xx, large pages (512kb or 8M) are used to map kernel linear
821 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
822 in that case. If PIN_TLB is selected, it must be aligned to 8M as
823 8M pages will be pinned.
825 config FORCE_MAX_ZONEORDER
826 int "Maximum zone order"
827 range 8 9 if PPC64 && PPC_64K_PAGES
828 default "9" if PPC64 && PPC_64K_PAGES
829 range 13 13 if PPC64 && !PPC_64K_PAGES
830 default "13" if PPC64 && !PPC_64K_PAGES
831 range 9 64 if PPC32 && PPC_16K_PAGES
832 default "9" if PPC32 && PPC_16K_PAGES
833 range 7 64 if PPC32 && PPC_64K_PAGES
834 default "7" if PPC32 && PPC_64K_PAGES
835 range 5 64 if PPC32 && PPC_256K_PAGES
836 default "5" if PPC32 && PPC_256K_PAGES
840 The kernel memory allocator divides physically contiguous memory
841 blocks into "zones", where each zone is a power of two number of
842 pages. This option selects the largest power of two that the kernel
843 keeps in the memory allocator. If you need to allocate very large
844 blocks of physically contiguous memory, then you may need to
847 This config option is actually maximum order plus one. For example,
848 a value of 11 means that the largest free memory block is 2^10 pages.
850 The page size is not necessarily 4KB. For example, on 64-bit
851 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
852 this in mind when choosing a value for this option.
854 config PPC_SUBPAGE_PROT
855 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
857 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
859 This option adds support for system call to allow user programs
860 to set access permissions (read/write, readonly, or no access)
861 on the 4k subpages of each 64k page.
863 If unsure, say N here.
865 config PPC_PROT_SAO_LPAR
866 bool "Support PROT_SAO mappings in LPARs"
867 depends on PPC_BOOK3S_64
869 This option adds support for PROT_SAO mappings from userspace
870 inside LPARs on supported CPUs.
872 This may cause issues when performing guest migration from
873 a CPU that supports SAO to one that does not.
875 If unsure, say N here.
877 config PPC_COPRO_BASE
881 bool "SMT (Hyperthreading) scheduler support"
882 depends on PPC64 && SMP
884 SMT scheduler support improves the CPU scheduler's decision making
885 when dealing with POWER5 cpus at a cost of slightly increased
886 overhead in some places. If unsure say N here.
888 config PPC_DENORMALISATION
889 bool "PowerPC denormalisation exception handling"
890 depends on PPC_BOOK3S_64
891 default "y" if PPC_POWERNV
893 Add support for handling denormalisation of single precision
894 values. Useful for bare metal only. If unsure say Y here.
897 string "Initial kernel command string"
900 On some platforms, there is currently no way for the boot loader to
901 pass arguments to the kernel. For these platforms, you can supply
902 some command-line options at build time by entering them here. In
903 most cases you will need to specify the root device here.
906 prompt "Kernel command line type" if CMDLINE != ""
907 default CMDLINE_FROM_BOOTLOADER
909 config CMDLINE_FROM_BOOTLOADER
910 bool "Use bootloader kernel arguments if available"
912 Uses the command-line options passed by the boot loader. If
913 the boot loader doesn't provide any, the default kernel command
914 string provided in CMDLINE will be used.
916 config CMDLINE_EXTEND
917 bool "Extend bootloader kernel arguments"
919 The command-line arguments provided by the boot loader will be
920 appended to the default kernel command string.
923 bool "Always use the default kernel command string"
925 Always use the default kernel command string, even if the boot
926 loader passes other arguments to the kernel.
927 This is useful if you cannot or don't want to change the
928 command-line options your boot loader passes to the kernel.
933 string "Additional default image types"
935 List additional targets to be built by the bootwrapper here (separated
936 by spaces). This is useful for targets that depend of device tree
937 files in the .dts directory.
939 Targets in this list will be build as part of the default build
940 target, or when the user does a 'make zImage' or a
941 'make zImage.initrd'.
943 If unsure, leave blank
945 config ARCH_WANTS_FREEZER_CONTROL
949 source "kernel/power/Kconfig"
952 prompt "PowerPC Memory Protection Keys"
954 depends on PPC_BOOK3S_64
955 select ARCH_USES_HIGH_VMA_FLAGS
956 select ARCH_HAS_PKEYS
958 Memory Protection Keys provides a mechanism for enforcing
959 page-based protections, but without requiring modification of the
960 page tables when an application changes protection domains.
962 For details, see Documentation/core-api/protection-keys.rst
966 config PPC_SECURE_BOOT
967 prompt "Enable secure boot support"
969 depends on PPC_POWERNV || PPC_PSERIES
970 depends on IMA_ARCH_POLICY
971 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
973 Systems with firmware secure boot enabled need to define security
974 policies to extend secure boot to the OS. This config allows a user
975 to enable OS secure boot on systems that have firmware support for
976 it. If in doubt say N.
978 config PPC_SECVAR_SYSFS
979 bool "Enable sysfs interface for POWER secure variables"
981 depends on PPC_SECURE_BOOT
984 POWER secure variables are managed and controlled by firmware.
985 These variables are exposed to userspace via sysfs to enable
986 read/write operations on these variables. Say Y if you have
987 secure boot enabled and want to expose variables to userspace.
989 config PPC_RTAS_FILTER
990 bool "Enable filtering of RTAS syscalls"
994 The RTAS syscall API has security issues that could be used to
995 compromise system integrity. This option enforces restrictions on the
996 RTAS calls and arguments passed by userspace programs to mitigate
999 Say Y unless you know what you are doing and the filter is causing
1011 bool "Support for ISA-bus hardware"
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
1023 depends on ISA_DMA_API
1026 config PPC_INDIRECT_PCI
1029 default y if 40x || 44x
1039 select ARCH_HAS_DMA_SET_MASK
1040 select PPC_INDIRECT_PCI
1046 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1048 Freescale MPC85xx/MPC86xx power management controller support
1049 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1054 depends on SUSPEND && (44x || 40x)
1056 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1057 It also enables support for two different idle states (idle-wait
1064 bool "Freescale Local Bus support"
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.
1072 depends on PPC_83xx || QUICC_ENGINE || CPM2
1074 Freescale General-purpose Timers support
1078 depends on PCI && 8260
1079 select PPC_INDIRECT_PCI
1083 bool "Freescale Embedded SRIO Controller support"
1084 depends on RAPIDIO = y && HAVE_RAPIDIO
1087 Include support for RapidIO controller on Freescale embedded
1088 processors (MPC8548, MPC8641, etc).
1092 config NONSTATIC_KERNEL
1095 menu "Advanced setup"
1098 config ADVANCED_OPTIONS
1099 bool "Prompt for advanced kernel configuration options"
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
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
1121 Say N here unless you know what you are doing.
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
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
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
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
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.
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
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
1185 Say N here unless you know what you are doing.
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
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
1208 default "0x04000000" if FSL_BOOKE
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
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.
1225 hex "Size of user task space" if TASK_SIZE_BOOL
1226 default "0x80000000" if PPC_8xx
1227 default "0xb0000000" if PPC_BOOK3S_32 && STRICT_KERNEL_RWX
1228 default "0xc0000000"
1232 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1235 default "0xc000000000000000"
1238 default "0xc000000000000000"
1239 config PHYSICAL_START
1241 default "0x00000000"
1247 config PPC_LIB_RHEAP
1250 source "arch/powerpc/kvm/Kconfig"
1252 source "kernel/livepatch/Kconfig"