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
65 int "Number of virtual interrupt numbers"
69 This defines the number of virtual interrupt numbers the kernel
70 can manage. Virtual interrupt numbers are what you see in
71 /proc/interrupts. If you configure your system to have too few,
72 drivers will fail to load or worse - handle with care.
76 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
81 depends on HARDLOCKUP_DETECTOR
82 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
85 This is a placeholder when the powerpc hardlockup detector
86 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
87 seleted via the generic lockup detector menu which is why we
88 have no standalone config option for it here.
90 config STACKTRACE_SUPPORT
94 config TRACE_IRQFLAGS_SUPPORT
98 config LOCKDEP_SUPPORT
102 config GENERIC_LOCKBREAK
105 depends on SMP && PREEMPTION
107 config GENERIC_HWEIGHT
115 # Please keep this list sorted alphabetically.
117 select ARCH_32BIT_OFF_T if PPC32
118 select ARCH_HAS_DEBUG_VIRTUAL
119 select ARCH_HAS_DEBUG_VM_PGTABLE
120 select ARCH_HAS_DEVMEM_IS_ALLOWED
121 select ARCH_HAS_ELF_RANDOMIZE
122 select ARCH_HAS_FORTIFY_SOURCE
123 select ARCH_HAS_GCOV_PROFILE_ALL
125 select ARCH_HAS_HUGEPD if HUGETLB_PAGE
126 select ARCH_HAS_MEMREMAP_COMPAT_ALIGN
127 select ARCH_HAS_MMIOWB if PPC64
128 select ARCH_HAS_PHYS_TO_DMA
129 select ARCH_HAS_PMEM_API
130 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
131 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
132 select ARCH_HAS_PTE_SPECIAL
133 select ARCH_HAS_MEMBARRIER_CALLBACKS
134 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
135 select ARCH_HAS_STRICT_KERNEL_RWX if (PPC32 && !HIBERNATION)
136 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
137 select ARCH_HAS_UACCESS_FLUSHCACHE
138 select ARCH_HAS_UACCESS_MCSAFE if PPC64
139 select ARCH_HAS_UBSAN_SANITIZE_ALL
140 select ARCH_HAVE_NMI_SAFE_CMPXCHG
141 select ARCH_KEEP_MEMBLOCK
142 select ARCH_MIGHT_HAVE_PC_PARPORT
143 select ARCH_MIGHT_HAVE_PC_SERIO
144 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
145 select ARCH_SUPPORTS_ATOMIC_RMW
146 select ARCH_USE_BUILTIN_BSWAP
147 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
148 select ARCH_WANT_IPC_PARSE_VERSION
149 select ARCH_WEAK_RELEASE_ACQUIRE
151 select BUILDTIME_TABLE_SORT
152 select CLONE_BACKWARDS
153 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
154 select DMA_OPS if PPC64
155 select DMA_OPS_BYPASS if PPC64
156 select DYNAMIC_FTRACE if FUNCTION_TRACER
157 select EDAC_ATOMIC_SCRUB
159 select GENERIC_ATOMIC64 if PPC32
160 select GENERIC_CLOCKEVENTS
161 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
162 select GENERIC_CMOS_UPDATE
163 select GENERIC_CPU_AUTOPROBE
164 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
165 select GENERIC_EARLY_IOREMAP
166 select GENERIC_IRQ_SHOW
167 select GENERIC_IRQ_SHOW_LEVEL
168 select GENERIC_PCI_IOMAP if PCI
169 select GENERIC_SMP_IDLE_THREAD
170 select GENERIC_STRNCPY_FROM_USER
171 select GENERIC_STRNLEN_USER
172 select GENERIC_TIME_VSYSCALL
173 select HAVE_ARCH_AUDITSYSCALL
174 select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
175 select HAVE_ARCH_JUMP_LABEL
176 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
177 select HAVE_ARCH_KASAN_VMALLOC if PPC32 && PPC_PAGE_SHIFT <= 14
178 select HAVE_ARCH_KGDB
179 select HAVE_ARCH_MMAP_RND_BITS
180 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
181 select HAVE_ARCH_NVRAM_OPS
182 select HAVE_ARCH_SECCOMP_FILTER
183 select HAVE_ARCH_TRACEHOOK
184 select HAVE_ASM_MODVERSIONS
185 select HAVE_C_RECORDMCOUNT
186 select HAVE_CBPF_JIT if !PPC64
187 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
188 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
189 select HAVE_CONTEXT_TRACKING if PPC64
190 select HAVE_TIF_NOHZ if PPC64
191 select HAVE_DEBUG_KMEMLEAK
192 select HAVE_DEBUG_STACKOVERFLOW
193 select HAVE_DYNAMIC_FTRACE
194 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
195 select HAVE_EBPF_JIT if PPC64
196 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
198 select HAVE_FTRACE_MCOUNT_RECORD
199 select HAVE_FUNCTION_ERROR_INJECTION
200 select HAVE_FUNCTION_GRAPH_TRACER
201 select HAVE_FUNCTION_TRACER
202 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
203 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
205 select HAVE_IOREMAP_PROT
206 select HAVE_IRQ_EXIT_ON_IRQ_STACK
207 select HAVE_KERNEL_GZIP
208 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
209 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
210 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
212 select HAVE_KPROBES_ON_FTRACE
213 select HAVE_KRETPROBES
214 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
215 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
216 select HAVE_MOD_ARCH_SPECIFIC
217 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
218 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
220 select HAVE_OPTPROBES if PPC64
221 select HAVE_PERF_EVENTS
222 select HAVE_PERF_EVENTS_NMI if PPC64
223 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
224 select HAVE_PERF_REGS
225 select HAVE_PERF_USER_STACK_DUMP
226 select MMU_GATHER_RCU_TABLE_FREE
227 select MMU_GATHER_PAGE_SIZE
228 select HAVE_REGS_AND_STACK_ACCESS_API
229 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
230 select HAVE_SYSCALL_TRACEPOINTS
231 select HAVE_VIRT_CPU_ACCOUNTING
232 select HAVE_IRQ_TIME_ACCOUNTING
234 select IOMMU_HELPER if PPC64
236 select IRQ_FORCED_THREADING
237 select MODULES_USE_ELF_RELA
238 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
239 select NEED_SG_DMA_LENGTH
241 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
242 select OF_EARLY_FLATTREE
243 select OLD_SIGACTION if PPC32
244 select OLD_SIGSUSPEND
245 select PCI_DOMAINS if PCI
246 select PCI_SYSCALL if PCI
247 select PPC_DAWR if PPC64
250 select SYSCTL_EXCEPTION_TRACE
251 select THREAD_INFO_IN_TASK
252 select VIRT_TO_BUS if !PPC64
254 # Please keep this list sorted alphabetically.
257 config PPC_BARRIER_NOSPEC
260 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
271 bool "Enable support for 32bit binaries"
273 default y if !CPU_LITTLE_ENDIAN
274 select COMPAT_BINFMT_ELF
275 select ARCH_WANT_OLD_COMPAT_IPC
276 select COMPAT_OLD_SIGACTION
278 config SYSVIPC_COMPAT
280 depends on COMPAT && SYSVIPC
283 config SCHED_OMIT_FRAME_POINTER
287 config ARCH_MAY_HAVE_PC_FDC
291 config PPC_UDBG_16550
294 config GENERIC_TBSYNC
296 default y if PPC32 && SMP
307 config SYS_SUPPORTS_APM_EMULATION
308 default y if PMAC_APM_EMU
314 Used to allow a board to specify it wants an ePAPR compliant wrapper.
316 config DEFAULT_UIMAGE
319 Used to allow a board to specify it wants a uImage built by default
321 config ARCH_HIBERNATION_POSSIBLE
325 config ARCH_SUSPEND_POSSIBLE
327 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
328 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
331 config ARCH_SUSPEND_NONZERO_CPU
333 depends on PPC_POWERNV || PPC_PSERIES
335 config PPC_DCR_NATIVE
343 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
346 config PPC_OF_PLATFORM_PCI
349 depends on PPC64 # not supported on 32 bits yet
351 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
352 depends on PPC32 || PPC_BOOK3S_64
355 config ARCH_SUPPORTS_UPROBES
358 config PPC_ADV_DEBUG_REGS
360 depends on 40x || BOOKE
363 config PPC_ADV_DEBUG_IACS
365 depends on PPC_ADV_DEBUG_REGS
369 config PPC_ADV_DEBUG_DACS
371 depends on PPC_ADV_DEBUG_REGS
374 config PPC_ADV_DEBUG_DVCS
376 depends on PPC_ADV_DEBUG_REGS
380 config PPC_ADV_DEBUG_DAC_RANGE
382 depends on PPC_ADV_DEBUG_REGS && 44x
390 default y if PPC_BOOK3E_64
392 config PGTABLE_LEVELS
397 source "arch/powerpc/sysdev/Kconfig"
398 source "arch/powerpc/platforms/Kconfig"
400 menu "Kernel options"
403 bool "High memory support"
406 source "kernel/Kconfig.hz"
408 config HUGETLB_PAGE_SIZE_VARIABLE
410 depends on HUGETLB_PAGE && PPC_BOOK3S_64
413 config MATH_EMULATION
414 bool "Math emulation"
415 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
417 Some PowerPC chips designed for embedded applications do not have
418 a floating-point unit and therefore do not implement the
419 floating-point instructions in the PowerPC instruction set. If you
420 say Y here, the kernel will include code to emulate a floating-point
421 unit, which will allow programs that use floating-point
424 This is also useful to emulate missing (optional) instructions
425 such as fsqrt on cores that do have an FPU but do not implement
426 them (such as Freescale BookE).
429 prompt "Math emulation options"
430 default MATH_EMULATION_FULL
431 depends on MATH_EMULATION
433 config MATH_EMULATION_FULL
434 bool "Emulate all the floating point instructions"
436 Select this option will enable the kernel to support to emulate
437 all the floating point instructions. If your SoC doesn't have
438 a FPU, you should select this.
440 config MATH_EMULATION_HW_UNIMPLEMENTED
441 bool "Just emulate the FPU unimplemented instructions"
443 Select this if you know there does have a hardware FPU on your
444 SoC, but some floating point instructions are not implemented by that.
448 config PPC_TRANSACTIONAL_MEM
449 bool "Transactional Memory support for POWERPC"
450 depends on PPC_BOOK3S_64
455 Support user-mode Transactional Memory on POWERPC.
458 bool "Ultravisor support"
459 depends on KVM_BOOK3S_HV_POSSIBLE
460 depends on DEVICE_PRIVATE
463 This option paravirtualizes the kernel to run in POWER platforms that
464 supports the Protected Execution Facility (PEF). On such platforms,
465 the ultravisor firmware runs at a privilege level above the
470 config LD_HEAD_STUB_CATCH
471 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
474 Very large kernels can cause linker branch stubs to be generated by
475 code in head_64.S, which moves the head text sections out of their
476 specified location. This option can work around the problem.
480 config MPROFILE_KERNEL
481 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
482 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
485 bool "Support for enabling/disabling CPUs"
486 depends on SMP && (PPC_PSERIES || \
487 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
489 Say Y here to be able to disable and re-enable individual
490 CPUs at runtime on SMP machines.
492 Say N if you are unsure.
494 config ARCH_CPU_PROBE_RELEASE
496 depends on HOTPLUG_CPU
498 config ARCH_ENABLE_MEMORY_HOTPLUG
501 config ARCH_ENABLE_MEMORY_HOTREMOVE
504 config PPC64_SUPPORTS_MEMORY_FAILURE
505 bool "Add support for memory hwpoison"
506 depends on PPC_BOOK3S_64
507 default "y" if PPC_POWERNV
508 select ARCH_SUPPORTS_MEMORY_FAILURE
511 bool "kexec system call"
512 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
515 kexec is a system call that implements the ability to shutdown your
516 current kernel, and to start another kernel. It is like a reboot
517 but it is independent of the system firmware. And like a reboot
518 you can start any kernel with it, not just Linux.
520 The name comes from the similarity to the exec system call.
522 It is an ongoing process to be certain the hardware in a machine
523 is properly shutdown, so do not be surprised if this code does not
524 initially work for you. As of this writing the exact hardware
525 interface is strongly in flux, so no good recommendation can be
529 bool "kexec file based system call"
531 select HAVE_IMA_KEXEC
536 depends on CRYPTO_SHA256=y
538 This is a new version of the kexec system call. This call is
539 file based and takes in file descriptors as system call arguments
540 for kernel and initramfs as opposed to a list of segments as is the
541 case for the older kexec call.
543 config ARCH_HAS_KEXEC_PURGATORY
547 bool "Build a relocatable kernel"
548 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
549 select NONSTATIC_KERNEL
550 select MODULE_REL_CRCS if MODVERSIONS
552 This builds a kernel image that is capable of running at the
553 location the kernel is loaded at. For ppc32, there is no any
554 alignment restrictions, and this feature is a superset of
555 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
556 16k-aligned base address. The kernel is linked as a
557 position-independent executable (PIE) and contains dynamic relocations
558 which are processed early in the bootup process.
560 One use is for the kexec on panic case where the recovery kernel
561 must live at a different physical address than the primary
564 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
565 it has been loaded at and the compile time physical addresses
566 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
567 setting can still be useful to bootwrappers that need to know the
568 load address of the kernel (eg. u-boot/mkimage).
570 config RANDOMIZE_BASE
571 bool "Randomize the address of the kernel image"
572 depends on (FSL_BOOKE && FLATMEM && PPC32)
573 depends on RELOCATABLE
575 Randomizes the virtual address at which the kernel image is
576 loaded, as a security feature that deters exploit attempts
577 relying on knowledge of the location of kernel internals.
581 config RELOCATABLE_TEST
582 bool "Test relocatable kernel"
583 depends on (PPC64 && RELOCATABLE)
585 This runs the relocatable kernel at the address it was initially
586 loaded at, which tends to be non-zero and therefore test the
590 bool "Build a dump capture kernel"
591 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
592 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
594 Build a kernel suitable for use as a dump capture kernel.
595 The same kernel binary can be used as production kernel and dump
599 bool "Firmware-assisted dump"
600 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
604 A robust mechanism to get reliable kernel crash dump with
605 assistance from firmware. This approach does not use kexec,
606 instead firmware assists in booting the capture kernel
607 while preserving memory contents. Firmware-assisted dump
608 is meant to be a kdump replacement offering robustness and
609 speed not possible without system firmware assistance.
611 If unsure, say "y". Only special kernels like petitboot may
612 need to say "N" here.
614 config PRESERVE_FA_DUMP
615 bool "Preserve Firmware-assisted dump"
616 depends on PPC64 && PPC_POWERNV && !FA_DUMP
618 On a kernel with FA_DUMP disabled, this option helps to preserve
619 crash data from a previously crash'ed kernel. Useful when the next
620 memory preserving kernel boot would process this crash data.
621 Petitboot kernel is the typical usecase for this option.
624 bool "Export OPAL memory as /sys/firmware/opal/core"
625 depends on PPC64 && PPC_POWERNV
627 This option uses the MPIPL support in firmware to provide an
628 ELF core of OPAL memory after a crash. The ELF core is exported
629 as /sys/firmware/opal/core file which is helpful in debugging
630 OPAL crashes using GDB.
633 bool "Distribute interrupts on all CPUs by default"
636 This option gives the kernel permission to distribute IRQs across
637 multiple CPUs. Saying N here will route all IRQs to the first
638 CPU. Generally saying Y is safe, although some problems have been
639 reported with SMP Power Macintoshes with this option enabled.
644 default y if SMP && PPC_PSERIES
650 depends on NEED_MULTIPLE_NODES
652 config USE_PERCPU_NUMA_NODE_ID
656 config HAVE_MEMORYLESS_NODES
660 config ARCH_SELECT_MEMORY_MODEL
664 config ARCH_FLATMEM_ENABLE
666 depends on (PPC64 && !NUMA) || PPC32
668 config ARCH_SPARSEMEM_ENABLE
671 select SPARSEMEM_VMEMMAP_ENABLE
673 config ARCH_SPARSEMEM_DEFAULT
675 depends on PPC_BOOK3S_64
677 config SYS_SUPPORTS_HUGETLBFS
680 config ILLEGAL_POINTER_VALUE
682 # This is roughly half way between the top of user space and the bottom
683 # of kernel space, which seems about as good as we can get.
684 default 0x5deadbeef0000000 if PPC64
687 config ARCH_MEMORY_PROBE
689 depends on MEMORY_HOTPLUG
692 bool "Using standard binutils settings"
696 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
697 Note, that kernel will be able to run only those applications,
698 which had been compiled using binutils later than 2.17.50.0.3 with
699 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
700 the older binutils, you can patch them with a trivial patch, which
701 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
707 Select the kernel logical page size. Increasing the page size
708 will reduce software overhead at each page boundary, allow
709 hardware prefetch mechanisms to be more effective, and allow
710 larger dma transfers increasing IO efficiency and reducing
711 overhead. However the utilization of memory will increase.
712 For example, each cached file will using a multiple of the
713 page size to hold its contents and the difference between the
714 end of file and the end of page is wasted.
716 Some dedicated systems, such as software raid serving with
717 accelerated calculations, have shown significant increases.
719 If you configure a 64 bit kernel for 64k pages but the
720 processor does not support them, then the kernel will simulate
721 them with 4k pages, loading them on demand, but with the
722 reduced software overhead and larger internal fragmentation.
723 For the 32 bit kernel, a large page option will not be offered
724 unless it is supported by the configured processor.
726 If unsure, choose 4K_PAGES.
730 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
734 depends on 44x || PPC_8xx
738 depends on 44x || PPC_BOOK3S_64
739 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
741 config PPC_256K_PAGES
742 bool "256k page size"
743 depends on 44x && !STDBINUTILS
745 Make the page size 256k.
747 As the ELF standard only requires alignment to support page
748 sizes up to 64k, you will need to compile all of your user
749 space applications with a non-standard binutils settings
750 (see the STDBINUTILS description for details).
752 Say N unless you know what you are doing.
756 config PPC_PAGE_SHIFT
758 default 18 if PPC_256K_PAGES
759 default 16 if PPC_64K_PAGES
760 default 14 if PPC_16K_PAGES
764 int "Thread shift" if EXPERT
766 default "15" if PPC_256K_PAGES
767 default "14" if PPC64
768 default "14" if KASAN
771 Used to define the stack size. The default is almost always what you
772 want. Only change this if you know what you are doing.
774 config DATA_SHIFT_BOOL
775 bool "Set custom data alignment"
776 depends on ADVANCED_OPTIONS
777 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC
778 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && \
779 (!PIN_TLB_TEXT || !STRICT_KERNEL_RWX))
781 This option allows you to set the kernel data alignment. When
782 RAM is mapped by blocks, the alignment needs to fit the size and
783 number of possible blocks. The default should be OK for most configs.
785 Say N here unless you know what you are doing.
788 int "Data shift" if DATA_SHIFT_BOOL
789 default 24 if STRICT_KERNEL_RWX && PPC64
790 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_BOOK3S_32
791 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_8xx
792 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
793 default 18 if DEBUG_PAGEALLOC && PPC_BOOK3S_32
794 default 23 if STRICT_KERNEL_RWX && PPC_8xx
795 default 23 if DEBUG_PAGEALLOC && PPC_8xx && PIN_TLB_DATA
796 default 19 if DEBUG_PAGEALLOC && PPC_8xx
797 default PPC_PAGE_SHIFT
799 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
800 Smaller is the alignment, greater is the number of necessary DBATs.
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. If PIN_TLB is selected, it must be aligned to 8M as
805 8M pages will be pinned.
807 config FORCE_MAX_ZONEORDER
808 int "Maximum zone order"
809 range 8 9 if PPC64 && PPC_64K_PAGES
810 default "9" if PPC64 && PPC_64K_PAGES
811 range 13 13 if PPC64 && !PPC_64K_PAGES
812 default "13" if PPC64 && !PPC_64K_PAGES
813 range 9 64 if PPC32 && PPC_16K_PAGES
814 default "9" if PPC32 && PPC_16K_PAGES
815 range 7 64 if PPC32 && PPC_64K_PAGES
816 default "7" if PPC32 && PPC_64K_PAGES
817 range 5 64 if PPC32 && PPC_256K_PAGES
818 default "5" if PPC32 && PPC_256K_PAGES
822 The kernel memory allocator divides physically contiguous memory
823 blocks into "zones", where each zone is a power of two number of
824 pages. This option selects the largest power of two that the kernel
825 keeps in the memory allocator. If you need to allocate very large
826 blocks of physically contiguous memory, then you may need to
829 This config option is actually maximum order plus one. For example,
830 a value of 11 means that the largest free memory block is 2^10 pages.
832 The page size is not necessarily 4KB. For example, on 64-bit
833 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
834 this in mind when choosing a value for this option.
836 config PPC_SUBPAGE_PROT
837 bool "Support setting protections for 4k subpages"
838 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
840 This option adds support for a system call to allow user programs
841 to set access permissions (read/write, readonly, or no access)
842 on the 4k subpages of each 64k page.
844 config PPC_COPRO_BASE
848 bool "SMT (Hyperthreading) scheduler support"
849 depends on PPC64 && SMP
851 SMT scheduler support improves the CPU scheduler's decision making
852 when dealing with POWER5 cpus at a cost of slightly increased
853 overhead in some places. If unsure say N here.
855 config PPC_DENORMALISATION
856 bool "PowerPC denormalisation exception handling"
857 depends on PPC_BOOK3S_64
858 default "y" if PPC_POWERNV
860 Add support for handling denormalisation of single precision
861 values. Useful for bare metal only. If unsure say Y here.
864 bool "Default bootloader kernel arguments"
867 string "Initial kernel command string" if CMDLINE_BOOL
868 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" if CMDLINE_BOOL
871 On some platforms, there is currently no way for the boot loader to
872 pass arguments to the kernel. For these platforms, you can supply
873 some command-line options at build time by entering them here. In
874 most cases you will need to specify the root device here.
877 prompt "Kernel command line type" if CMDLINE != ""
878 default CMDLINE_FROM_BOOTLOADER
880 config CMDLINE_FROM_BOOTLOADER
881 bool "Use bootloader kernel arguments if available"
883 Uses the command-line options passed by the boot loader. If
884 the boot loader doesn't provide any, the default kernel command
885 string provided in CMDLINE will be used.
887 config CMDLINE_EXTEND
888 bool "Extend bootloader kernel arguments"
890 The command-line arguments provided by the boot loader will be
891 appended to the default kernel command string.
894 bool "Always use the default kernel command string"
896 Always use the default kernel command string, even if the boot
897 loader passes other arguments to the kernel.
898 This is useful if you cannot or don't want to change the
899 command-line options your boot loader passes to the kernel.
904 string "Additional default image types"
906 List additional targets to be built by the bootwrapper here (separated
907 by spaces). This is useful for targets that depend of device tree
908 files in the .dts directory.
910 Targets in this list will be build as part of the default build
911 target, or when the user does a 'make zImage' or a
912 'make zImage.initrd'.
914 If unsure, leave blank
916 config ARCH_WANTS_FREEZER_CONTROL
920 source "kernel/power/Kconfig"
923 bool "Enable seccomp to safely compute untrusted bytecode"
927 This kernel feature is useful for number crunching applications
928 that may need to compute untrusted bytecode during their
929 execution. By using pipes or other transports made available to
930 the process as file descriptors supporting the read/write
931 syscalls, it's possible to isolate those applications in
932 their own address space using seccomp. Once seccomp is
933 enabled via /proc/<pid>/seccomp, it cannot be disabled
934 and the task is only allowed to execute a few safe syscalls
935 defined by each seccomp mode.
937 If unsure, say Y. Only embedded should say N here.
940 prompt "PowerPC Memory Protection Keys"
942 depends on PPC_BOOK3S_64
943 select ARCH_USES_HIGH_VMA_FLAGS
944 select ARCH_HAS_PKEYS
946 Memory Protection Keys provides a mechanism for enforcing
947 page-based protections, but without requiring modification of the
948 page tables when an application changes protection domains.
950 For details, see Documentation/core-api/protection-keys.rst
954 config PPC_SECURE_BOOT
955 prompt "Enable secure boot support"
957 depends on PPC_POWERNV
958 depends on IMA_ARCH_POLICY
959 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
961 Systems with firmware secure boot enabled need to define security
962 policies to extend secure boot to the OS. This config allows a user
963 to enable OS secure boot on systems that have firmware support for
964 it. If in doubt say N.
966 config PPC_SECVAR_SYSFS
967 bool "Enable sysfs interface for POWER secure variables"
969 depends on PPC_SECURE_BOOT
972 POWER secure variables are managed and controlled by firmware.
973 These variables are exposed to userspace via sysfs to enable
974 read/write operations on these variables. Say Y if you have
975 secure boot enabled and want to expose variables to userspace.
986 bool "Support for ISA-bus hardware"
990 Find out whether you have ISA slots on your motherboard. ISA is the
991 name of a bus system, i.e. the way the CPU talks to the other stuff
992 inside your box. If you have an Apple machine, say N here; if you
993 have an IBM RS/6000 or pSeries machine, say Y. If you have an
994 embedded board, consult your board documentation.
996 config GENERIC_ISA_DMA
998 depends on ISA_DMA_API
1001 config PPC_INDIRECT_PCI
1004 default y if 40x || 44x
1014 select ARCH_HAS_DMA_SET_MASK
1015 select PPC_INDIRECT_PCI
1021 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1023 Freescale MPC85xx/MPC86xx power management controller support
1024 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1029 depends on SUSPEND && (44x || 40x)
1031 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1032 It also enables support for two different idle states (idle-wait
1039 bool "Freescale Local Bus support"
1041 Enables reporting of errors from the Freescale local bus
1042 controller. Also contains some common code used by
1043 drivers for specific local bus peripherals.
1047 depends on PPC_83xx || QUICC_ENGINE || CPM2
1049 Freescale General-purpose Timers support
1053 depends on PCI && 8260
1054 select PPC_INDIRECT_PCI
1058 bool "Freescale Embedded SRIO Controller support"
1059 depends on RAPIDIO = y && HAVE_RAPIDIO
1062 Include support for RapidIO controller on Freescale embedded
1063 processors (MPC8548, MPC8641, etc).
1067 config NONSTATIC_KERNEL
1070 menu "Advanced setup"
1073 config ADVANCED_OPTIONS
1074 bool "Prompt for advanced kernel configuration options"
1076 This option will enable prompting for a variety of advanced kernel
1077 configuration options. These options can cause the kernel to not
1078 work if they are set incorrectly, but can be used to optimize certain
1079 aspects of kernel memory management.
1081 Unless you know what you are doing, say N here.
1083 comment "Default settings for advanced configuration options are used"
1084 depends on !ADVANCED_OPTIONS
1086 config LOWMEM_SIZE_BOOL
1087 bool "Set maximum low memory"
1088 depends on ADVANCED_OPTIONS
1090 This option allows you to set the maximum amount of memory which
1091 will be used as "low memory", that is, memory which the kernel can
1092 access directly, without having to set up a kernel virtual mapping.
1093 This can be useful in optimizing the layout of kernel virtual
1096 Say N here unless you know what you are doing.
1099 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1100 default "0x30000000"
1102 config LOWMEM_CAM_NUM_BOOL
1103 bool "Set number of CAMs to use to map low memory"
1104 depends on ADVANCED_OPTIONS && FSL_BOOKE
1106 This option allows you to set the maximum number of CAM slots that
1107 will be used to map low memory. There are a limited number of slots
1108 available and even more limited number that will fit in the L1 MMU.
1109 However, using more entries will allow mapping more low memory. This
1110 can be useful in optimizing the layout of kernel virtual memory.
1112 Say N here unless you know what you are doing.
1114 config LOWMEM_CAM_NUM
1115 depends on FSL_BOOKE
1116 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1119 config DYNAMIC_MEMSTART
1120 bool "Enable page aligned dynamic load address for kernel"
1121 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1122 select NONSTATIC_KERNEL
1124 This option enables the kernel to be loaded at any page aligned
1125 physical address. The kernel creates a mapping from KERNELBASE to
1126 the address where the kernel is loaded. The page size here implies
1127 the TLB page size of the mapping for kernel on the particular platform.
1128 Please refer to the init code for finding the TLB page size.
1130 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1131 kernel image, where the only restriction is the page aligned kernel
1132 load address. When this option is enabled, the compile time physical
1133 address CONFIG_PHYSICAL_START is ignored.
1135 This option is overridden by CONFIG_RELOCATABLE
1137 config PAGE_OFFSET_BOOL
1138 bool "Set custom page offset address"
1139 depends on ADVANCED_OPTIONS
1141 This option allows you to set the kernel virtual address at which
1142 the kernel will map low memory. This can be useful in optimizing
1143 the virtual memory layout of the system.
1145 Say N here unless you know what you are doing.
1148 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1149 default "0xc0000000"
1151 config KERNEL_START_BOOL
1152 bool "Set custom kernel base address"
1153 depends on ADVANCED_OPTIONS
1155 This option allows you to set the kernel virtual address at which
1156 the kernel will be loaded. Normally this should match PAGE_OFFSET
1157 however there are times (like kdump) that one might not want them
1160 Say N here unless you know what you are doing.
1163 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1164 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1165 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1166 default "0xc0000000"
1168 config PHYSICAL_START_BOOL
1169 bool "Set physical address where the kernel is loaded"
1170 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1172 This gives the physical address where the kernel is loaded.
1174 Say N here unless you know what you are doing.
1176 config PHYSICAL_START
1177 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1178 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1179 default "0x00000000"
1181 config PHYSICAL_ALIGN
1183 default "0x04000000" if FSL_BOOKE
1185 This value puts the alignment restrictions on physical address
1186 where kernel is loaded and run from. Kernel is compiled for an
1187 address which meets above alignment restriction.
1189 config TASK_SIZE_BOOL
1190 bool "Set custom user task size"
1191 depends on ADVANCED_OPTIONS
1193 This option allows you to set the amount of virtual address space
1194 allocated to user tasks. This can be useful in optimizing the
1195 virtual memory layout of the system.
1197 Say N here unless you know what you are doing.
1200 hex "Size of user task space" if TASK_SIZE_BOOL
1201 default "0x80000000" if PPC_8xx
1202 default "0xc0000000"
1206 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1209 default "0xc000000000000000"
1212 default "0xc000000000000000"
1213 config PHYSICAL_START
1215 default "0x00000000"
1221 config PPC_LIB_RHEAP
1224 source "arch/powerpc/kvm/Kconfig"
1226 source "kernel/livepatch/Kconfig"