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Googler9398cc32022-12-02 17:21:52 +08001# SPDX-License-Identifier: GPL-2.0
Googleraf606d22022-10-26 21:40:12 -07002source "arch/powerpc/platforms/Kconfig.cputype"
3
4config PPC32
5 bool
6 default y if !PPC64
7
8config 32BIT
9 bool
10 default y if PPC32
11
12config 64BIT
13 bool
14 default y if PPC64
15
Googleraf606d22022-10-26 21:40:12 -070016config MMU
17 bool
18 default y
19
Googler9398cc32022-12-02 17:21:52 +080020config ARCH_MMAP_RND_BITS_MAX
21 # On Book3S 64, the default virtual address space for 64-bit processes
22 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
23 # 32T of address space (2^45), which should ensure a reasonable gap
24 # between bottom-up and top-down allocations for applications that
25 # consume "normal" amounts of address space. Book3S 64 only supports 64K
26 # and 4K page sizes.
27 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
28 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K)
29 #
30 # On all other 64-bit platforms (currently only Book3E), the virtual
31 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
32 # of address space (2^44). Only 4K page sizes are supported.
33 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K)
34 #
35 # For 32-bit, use the compat values, as they're the same.
36 default ARCH_MMAP_RND_COMPAT_BITS_MAX
37
38config ARCH_MMAP_RND_BITS_MIN
39 # Allow randomisation to consume up to 1GB of address space (2^30).
40 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K)
41 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K)
42 #
43 # For 32-bit, use the compat values, as they're the same.
44 default ARCH_MMAP_RND_COMPAT_BITS_MIN
45
46config ARCH_MMAP_RND_COMPAT_BITS_MAX
47 # Total virtual address space for 32-bit processes is 2^31 (2GB).
48 # Allow randomisation to consume up to 512MB of address space (2^29).
49 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K)
50 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K)
51 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K)
52 default 17 # 17 = 29 (512MB) - 12 (4K)
53
54config ARCH_MMAP_RND_COMPAT_BITS_MIN
55 # Total virtual address space for 32-bit processes is 2^31 (2GB).
56 # Allow randomisation to consume up to 8MB of address space (2^23).
57 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K)
58 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K)
59 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K)
60 default 11 # 11 = 23 (8MB) - 12 (4K)
61
Googleraf606d22022-10-26 21:40:12 -070062config HAVE_SETUP_PER_CPU_AREA
63 def_bool PPC64
64
65config NEED_PER_CPU_EMBED_FIRST_CHUNK
66 def_bool PPC64
67
68config NR_IRQS
69 int "Number of virtual interrupt numbers"
70 range 32 32768
71 default "512"
72 help
73 This defines the number of virtual interrupt numbers the kernel
74 can manage. Virtual interrupt numbers are what you see in
75 /proc/interrupts. If you configure your system to have too few,
76 drivers will fail to load or worse - handle with care.
77
Googler9398cc32022-12-02 17:21:52 +080078config NMI_IPI
79 bool
80 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
81 default y
82
83config PPC_WATCHDOG
84 bool
85 depends on HARDLOCKUP_DETECTOR
86 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
87 default y
88 help
89 This is a placeholder when the powerpc hardlockup detector
90 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
91 seleted via the generic lockup detector menu which is why we
92 have no standalone config option for it here.
93
Googleraf606d22022-10-26 21:40:12 -070094config STACKTRACE_SUPPORT
95 bool
96 default y
97
98config TRACE_IRQFLAGS_SUPPORT
99 bool
100 default y
101
102config LOCKDEP_SUPPORT
103 bool
104 default y
105
Googleraf606d22022-10-26 21:40:12 -0700106config GENERIC_LOCKBREAK
107 bool
108 default y
109 depends on SMP && PREEMPT
110
Googleraf606d22022-10-26 21:40:12 -0700111config GENERIC_HWEIGHT
112 bool
113 default y
114
Googleraf606d22022-10-26 21:40:12 -0700115config PPC
116 bool
117 default y
Googler9398cc32022-12-02 17:21:52 +0800118 #
119 # Please keep this list sorted alphabetically.
120 #
121 select ARCH_32BIT_OFF_T if PPC32
122 select ARCH_HAS_DEBUG_VIRTUAL
123 select ARCH_HAS_DEVMEM_IS_ALLOWED
124 select ARCH_HAS_ELF_RANDOMIZE
125 select ARCH_HAS_FORTIFY_SOURCE
126 select ARCH_HAS_GCOV_PROFILE_ALL
127 select ARCH_HAS_KCOV
128 select ARCH_HAS_HUGEPD if HUGETLB_PAGE
129 select ARCH_HAS_MMIOWB if PPC64
130 select ARCH_HAS_PHYS_TO_DMA
131 select ARCH_HAS_PMEM_API
132 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
133 select ARCH_HAS_PTE_SPECIAL
134 select ARCH_HAS_MEMBARRIER_CALLBACKS
135 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
136 select ARCH_HAS_STRICT_KERNEL_RWX if (PPC32 && !HIBERNATION)
137 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
138 select ARCH_HAS_UACCESS_FLUSHCACHE
139 select ARCH_HAS_UACCESS_MCSAFE if PPC64
140 select ARCH_HAS_UBSAN_SANITIZE_ALL
141 select ARCH_HAVE_NMI_SAFE_CMPXCHG
142 select ARCH_KEEP_MEMBLOCK
Googleraf606d22022-10-26 21:40:12 -0700143 select ARCH_MIGHT_HAVE_PC_PARPORT
144 select ARCH_MIGHT_HAVE_PC_SERIO
Googler9398cc32022-12-02 17:21:52 +0800145 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
146 select ARCH_SUPPORTS_ATOMIC_RMW
147 select ARCH_USE_BUILTIN_BSWAP
148 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
149 select ARCH_WANT_IPC_PARSE_VERSION
150 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
151 select ARCH_WEAK_RELEASE_ACQUIRE
Googleraf606d22022-10-26 21:40:12 -0700152 select BINFMT_ELF
Googler9398cc32022-12-02 17:21:52 +0800153 select BUILDTIME_EXTABLE_SORT
154 select CLONE_BACKWARDS
155 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
156 select DYNAMIC_FTRACE if FUNCTION_TRACER
157 select EDAC_ATOMIC_SCRUB
158 select EDAC_SUPPORT
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_IRQ_SHOW
166 select GENERIC_IRQ_SHOW_LEVEL
167 select GENERIC_PCI_IOMAP if PCI
168 select GENERIC_SMP_IDLE_THREAD
169 select GENERIC_STRNCPY_FROM_USER
170 select GENERIC_STRNLEN_USER
171 select GENERIC_TIME_VSYSCALL
172 select HAVE_ARCH_AUDITSYSCALL
173 select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
174 select HAVE_ARCH_JUMP_LABEL
175 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
176 select HAVE_ARCH_KGDB
177 select HAVE_ARCH_MMAP_RND_BITS
178 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
179 select HAVE_ARCH_NVRAM_OPS
180 select HAVE_ARCH_SECCOMP_FILTER
181 select HAVE_ARCH_TRACEHOOK
182 select HAVE_ASM_MODVERSIONS
183 select HAVE_C_RECORDMCOUNT
184 select HAVE_CBPF_JIT if !PPC64
185 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
186 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
187 select HAVE_CONTEXT_TRACKING if PPC64
188 select HAVE_COPY_THREAD_TLS
189 select HAVE_DEBUG_KMEMLEAK
190 select HAVE_DEBUG_STACKOVERFLOW
191 select HAVE_DYNAMIC_FTRACE
192 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
193 select HAVE_EBPF_JIT if PPC64
194 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
195 select HAVE_FAST_GUP
196 select HAVE_FTRACE_MCOUNT_RECORD
197 select HAVE_FUNCTION_ERROR_INJECTION
198 select HAVE_FUNCTION_GRAPH_TRACER
199 select HAVE_FUNCTION_TRACER
200 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
201 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
202 select HAVE_IDE
203 select HAVE_IOREMAP_PROT
204 select HAVE_IRQ_EXIT_ON_IRQ_STACK
205 select HAVE_KERNEL_GZIP
206 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
207 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
Googlerb48fa912023-03-17 12:40:29 +0530208 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x || PPC_85xx
Googler9398cc32022-12-02 17:21:52 +0800209 select HAVE_KPROBES
210 select HAVE_KPROBES_ON_FTRACE
211 select HAVE_KRETPROBES
212 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
213 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
214 select HAVE_MEMBLOCK_NODE_MAP
215 select HAVE_MOD_ARCH_SPECIFIC
216 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
Googlerb48fa912023-03-17 12:40:29 +0530217 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
Googler9398cc32022-12-02 17:21:52 +0800218 select HAVE_OPROFILE
219 select HAVE_OPTPROBES if PPC64
220 select HAVE_PERF_EVENTS
221 select HAVE_PERF_EVENTS_NMI if PPC64
222 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
223 select HAVE_PERF_REGS
224 select HAVE_PERF_USER_STACK_DUMP
225 select HAVE_RCU_TABLE_FREE
226 select HAVE_MMU_GATHER_PAGE_SIZE
227 select HAVE_REGS_AND_STACK_ACCESS_API
228 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
229 select HAVE_SYSCALL_TRACEPOINTS
230 select HAVE_VIRT_CPU_ACCOUNTING
231 select HAVE_IRQ_TIME_ACCOUNTING
232 select HAVE_RSEQ
233 select IOMMU_HELPER if PPC64
234 select IRQ_DOMAIN
235 select IRQ_FORCED_THREADING
236 select MODULES_USE_ELF_RELA
237 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
238 select NEED_SG_DMA_LENGTH
Googleraf606d22022-10-26 21:40:12 -0700239 select OF
240 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
241 select OF_EARLY_FLATTREE
Googler9398cc32022-12-02 17:21:52 +0800242 select OLD_SIGACTION if PPC32
Googler9726be62022-12-14 05:53:31 +0000243 select OLD_SIGSUSPEND
Googler9398cc32022-12-02 17:21:52 +0800244 select PCI_DOMAINS if PCI
245 select PCI_SYSCALL if PCI
246 select PPC_DAWR if PPC64
247 select RTC_LIB
248 select SPARSE_IRQ
249 select SYSCTL_EXCEPTION_TRACE
250 select THREAD_INFO_IN_TASK
251 select VIRT_TO_BUS if !PPC64
252 #
253 # Please keep this list sorted alphabetically.
254 #
Googleraf606d22022-10-26 21:40:12 -0700255
256config PPC_BARRIER_NOSPEC
Googler9398cc32022-12-02 17:21:52 +0800257 bool
258 default y
259 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
Googleraf606d22022-10-26 21:40:12 -0700260
261config EARLY_PRINTK
262 bool
263 default y
264
265config PANIC_TIMEOUT
266 int
267 default 180
268
269config COMPAT
270 bool
271 default y if PPC64
272 select COMPAT_BINFMT_ELF
273 select ARCH_WANT_OLD_COMPAT_IPC
274 select COMPAT_OLD_SIGACTION
275
276config SYSVIPC_COMPAT
277 bool
278 depends on COMPAT && SYSVIPC
279 default y
280
Googleraf606d22022-10-26 21:40:12 -0700281config SCHED_OMIT_FRAME_POINTER
282 bool
283 default y
284
285config ARCH_MAY_HAVE_PC_FDC
286 bool
287 default PCI
288
289config PPC_UDBG_16550
290 bool
Googleraf606d22022-10-26 21:40:12 -0700291
292config GENERIC_TBSYNC
293 bool
294 default y if PPC32 && SMP
Googleraf606d22022-10-26 21:40:12 -0700295
296config AUDIT_ARCH
297 bool
298 default y
299
300config GENERIC_BUG
301 bool
302 default y
303 depends on BUG
304
305config SYS_SUPPORTS_APM_EMULATION
306 default y if PMAC_APM_EMU
307 bool
308
309config EPAPR_BOOT
310 bool
311 help
312 Used to allow a board to specify it wants an ePAPR compliant wrapper.
Googleraf606d22022-10-26 21:40:12 -0700313
314config DEFAULT_UIMAGE
315 bool
316 help
317 Used to allow a board to specify it wants a uImage built by default
Googleraf606d22022-10-26 21:40:12 -0700318
319config ARCH_HIBERNATION_POSSIBLE
320 bool
321 default y
322
323config ARCH_SUSPEND_POSSIBLE
324 def_bool y
325 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
326 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
327 || 44x || 40x
328
Googler9398cc32022-12-02 17:21:52 +0800329config ARCH_SUSPEND_NONZERO_CPU
330 def_bool y
331 depends on PPC_POWERNV || PPC_PSERIES
332
Googleraf606d22022-10-26 21:40:12 -0700333config PPC_DCR_NATIVE
334 bool
Googleraf606d22022-10-26 21:40:12 -0700335
336config PPC_DCR_MMIO
337 bool
Googleraf606d22022-10-26 21:40:12 -0700338
339config PPC_DCR
340 bool
341 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
342 default y
343
344config PPC_OF_PLATFORM_PCI
345 bool
346 depends on PCI
347 depends on PPC64 # not supported on 32 bits yet
Googleraf606d22022-10-26 21:40:12 -0700348
349config ARCH_SUPPORTS_DEBUG_PAGEALLOC
Googler9398cc32022-12-02 17:21:52 +0800350 depends on PPC32 || PPC_BOOK3S_64
Googleraf606d22022-10-26 21:40:12 -0700351 def_bool y
352
353config ARCH_SUPPORTS_UPROBES
354 def_bool y
355
356config PPC_ADV_DEBUG_REGS
357 bool
358 depends on 40x || BOOKE
359 default y
360
361config PPC_ADV_DEBUG_IACS
362 int
363 depends on PPC_ADV_DEBUG_REGS
364 default 4 if 44x
365 default 2
366
367config PPC_ADV_DEBUG_DACS
368 int
369 depends on PPC_ADV_DEBUG_REGS
370 default 2
371
372config PPC_ADV_DEBUG_DVCS
373 int
374 depends on PPC_ADV_DEBUG_REGS
375 default 2 if 44x
376 default 0
377
378config PPC_ADV_DEBUG_DAC_RANGE
379 bool
380 depends on PPC_ADV_DEBUG_REGS && 44x
381 default y
382
Googler9398cc32022-12-02 17:21:52 +0800383config PPC_DAWR
Googler9726be62022-12-14 05:53:31 +0000384 bool
Googler9726be62022-12-14 05:53:31 +0000385
Googler9398cc32022-12-02 17:21:52 +0800386config ZONE_DMA
Googleraf606d22022-10-26 21:40:12 -0700387 bool
Googler9398cc32022-12-02 17:21:52 +0800388 default y if PPC_BOOK3E_64
Googleraf606d22022-10-26 21:40:12 -0700389
390config PGTABLE_LEVELS
391 int
392 default 2 if !PPC64
Googleraf606d22022-10-26 21:40:12 -0700393 default 4
394
Googleraf606d22022-10-26 21:40:12 -0700395source "arch/powerpc/sysdev/Kconfig"
396source "arch/powerpc/platforms/Kconfig"
397
398menu "Kernel options"
399
400config HIGHMEM
401 bool "High memory support"
402 depends on PPC32
403
Googler9398cc32022-12-02 17:21:52 +0800404source "kernel/Kconfig.hz"
Googleraf606d22022-10-26 21:40:12 -0700405
406config HUGETLB_PAGE_SIZE_VARIABLE
407 bool
Googler9398cc32022-12-02 17:21:52 +0800408 depends on HUGETLB_PAGE && PPC_BOOK3S_64
Googleraf606d22022-10-26 21:40:12 -0700409 default y
410
411config MATH_EMULATION
412 bool "Math emulation"
Googler9398cc32022-12-02 17:21:52 +0800413 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
414 help
Googleraf606d22022-10-26 21:40:12 -0700415 Some PowerPC chips designed for embedded applications do not have
416 a floating-point unit and therefore do not implement the
417 floating-point instructions in the PowerPC instruction set. If you
418 say Y here, the kernel will include code to emulate a floating-point
419 unit, which will allow programs that use floating-point
420 instructions to run.
421
422 This is also useful to emulate missing (optional) instructions
423 such as fsqrt on cores that do have an FPU but do not implement
424 them (such as Freescale BookE).
425
426choice
427 prompt "Math emulation options"
428 default MATH_EMULATION_FULL
429 depends on MATH_EMULATION
430
431config MATH_EMULATION_FULL
432 bool "Emulate all the floating point instructions"
Googler9398cc32022-12-02 17:21:52 +0800433 help
Googleraf606d22022-10-26 21:40:12 -0700434 Select this option will enable the kernel to support to emulate
435 all the floating point instructions. If your SoC doesn't have
436 a FPU, you should select this.
437
438config MATH_EMULATION_HW_UNIMPLEMENTED
439 bool "Just emulate the FPU unimplemented instructions"
Googler9398cc32022-12-02 17:21:52 +0800440 help
Googleraf606d22022-10-26 21:40:12 -0700441 Select this if you know there does have a hardware FPU on your
442 SoC, but some floating point instructions are not implemented by that.
443
444endchoice
445
446config PPC_TRANSACTIONAL_MEM
Googler9398cc32022-12-02 17:21:52 +0800447 bool "Transactional Memory support for POWERPC"
448 depends on PPC_BOOK3S_64
449 depends on SMP
450 select ALTIVEC
451 select VSX
Googler38bda472022-08-19 10:07:08 -0700452 help
Googler9398cc32022-12-02 17:21:52 +0800453 Support user-mode Transactional Memory on POWERPC.
Googler38bda472022-08-19 10:07:08 -0700454
Googler9398cc32022-12-02 17:21:52 +0800455config LD_HEAD_STUB_CATCH
456 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
457 depends on PPC64
458 help
459 Very large kernels can cause linker branch stubs to be generated by
460 code in head_64.S, which moves the head text sections out of their
461 specified location. This option can work around the problem.
462
463 If unsure, say "N".
Googleraf606d22022-10-26 21:40:12 -0700464
465config MPROFILE_KERNEL
466 depends on PPC64 && CPU_LITTLE_ENDIAN
Googler9398cc32022-12-02 17:21:52 +0800467 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
Googleraf606d22022-10-26 21:40:12 -0700468
469config HOTPLUG_CPU
470 bool "Support for enabling/disabling CPUs"
471 depends on SMP && (PPC_PSERIES || \
472 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
Googler9398cc32022-12-02 17:21:52 +0800473 help
Googleraf606d22022-10-26 21:40:12 -0700474 Say Y here to be able to disable and re-enable individual
475 CPUs at runtime on SMP machines.
476
477 Say N if you are unsure.
478
479config ARCH_CPU_PROBE_RELEASE
480 def_bool y
481 depends on HOTPLUG_CPU
482
483config ARCH_ENABLE_MEMORY_HOTPLUG
484 def_bool y
485
Googleraf606d22022-10-26 21:40:12 -0700486config ARCH_ENABLE_MEMORY_HOTREMOVE
487 def_bool y
488
489config PPC64_SUPPORTS_MEMORY_FAILURE
490 bool "Add support for memory hwpoison"
491 depends on PPC_BOOK3S_64
492 default "y" if PPC_POWERNV
493 select ARCH_SUPPORTS_MEMORY_FAILURE
494
495config KEXEC
496 bool "kexec system call"
497 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
498 select KEXEC_CORE
499 help
500 kexec is a system call that implements the ability to shutdown your
501 current kernel, and to start another kernel. It is like a reboot
502 but it is independent of the system firmware. And like a reboot
503 you can start any kernel with it, not just Linux.
504
505 The name comes from the similarity to the exec system call.
506
507 It is an ongoing process to be certain the hardware in a machine
508 is properly shutdown, so do not be surprised if this code does not
509 initially work for you. As of this writing the exact hardware
510 interface is strongly in flux, so no good recommendation can be
511 made.
512
Googler9398cc32022-12-02 17:21:52 +0800513config KEXEC_FILE
514 bool "kexec file based system call"
515 select KEXEC_CORE
516 select HAVE_IMA_KEXEC
517 select BUILD_BIN2C
518 select KEXEC_ELF
519 depends on PPC64
520 depends on CRYPTO=y
521 depends on CRYPTO_SHA256=y
522 help
523 This is a new version of the kexec system call. This call is
524 file based and takes in file descriptors as system call arguments
525 for kernel and initramfs as opposed to a list of segments as is the
526 case for the older kexec call.
527
528config ARCH_HAS_KEXEC_PURGATORY
529 def_bool KEXEC_FILE
530
Googleraf606d22022-10-26 21:40:12 -0700531config RELOCATABLE
532 bool "Build a relocatable kernel"
Googler9398cc32022-12-02 17:21:52 +0800533 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
Googleraf606d22022-10-26 21:40:12 -0700534 select NONSTATIC_KERNEL
Googler9398cc32022-12-02 17:21:52 +0800535 select MODULE_REL_CRCS if MODVERSIONS
Googleraf606d22022-10-26 21:40:12 -0700536 help
537 This builds a kernel image that is capable of running at the
538 location the kernel is loaded at. For ppc32, there is no any
539 alignment restrictions, and this feature is a superset of
540 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
541 16k-aligned base address. The kernel is linked as a
542 position-independent executable (PIE) and contains dynamic relocations
543 which are processed early in the bootup process.
544
545 One use is for the kexec on panic case where the recovery kernel
546 must live at a different physical address than the primary
547 kernel.
548
549 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
550 it has been loaded at and the compile time physical addresses
551 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
552 setting can still be useful to bootwrappers that need to know the
553 load address of the kernel (eg. u-boot/mkimage).
554
Googler9398cc32022-12-02 17:21:52 +0800555config RELOCATABLE_TEST
556 bool "Test relocatable kernel"
557 depends on (PPC64 && RELOCATABLE)
Googler0109c452022-10-13 17:50:39 +0800558 help
Googler9398cc32022-12-02 17:21:52 +0800559 This runs the relocatable kernel at the address it was initially
560 loaded at, which tends to be non-zero and therefore test the
561 relocation code.
562
563config CRASH_DUMP
564 bool "Build a dump capture kernel"
565 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
566 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
567 help
568 Build a kernel suitable for use as a dump capture kernel.
Googleraf606d22022-10-26 21:40:12 -0700569 The same kernel binary can be used as production kernel and dump
570 capture kernel.
571
572config FA_DUMP
573 bool "Firmware-assisted dump"
Googler9398cc32022-12-02 17:21:52 +0800574 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
575 select CRASH_CORE
576 select CRASH_DUMP
Googleraf606d22022-10-26 21:40:12 -0700577 help
578 A robust mechanism to get reliable kernel crash dump with
579 assistance from firmware. This approach does not use kexec,
Googler9398cc32022-12-02 17:21:52 +0800580 instead firmware assists in booting the capture kernel
Googleraf606d22022-10-26 21:40:12 -0700581 while preserving memory contents. Firmware-assisted dump
582 is meant to be a kdump replacement offering robustness and
583 speed not possible without system firmware assistance.
584
Googler9398cc32022-12-02 17:21:52 +0800585 If unsure, say "y". Only special kernels like petitboot may
586 need to say "N" here.
587
588config PRESERVE_FA_DUMP
589 bool "Preserve Firmware-assisted dump"
590 depends on PPC64 && PPC_POWERNV && !FA_DUMP
591 help
592 On a kernel with FA_DUMP disabled, this option helps to preserve
593 crash data from a previously crash'ed kernel. Useful when the next
594 memory preserving kernel boot would process this crash data.
595 Petitboot kernel is the typical usecase for this option.
596
597config OPAL_CORE
598 bool "Export OPAL memory as /sys/firmware/opal/core"
599 depends on PPC64 && PPC_POWERNV
600 help
601 This option uses the MPIPL support in firmware to provide an
602 ELF core of OPAL memory after a crash. The ELF core is exported
603 as /sys/firmware/opal/core file which is helpful in debugging
604 OPAL crashes using GDB.
Googleraf606d22022-10-26 21:40:12 -0700605
606config IRQ_ALL_CPUS
607 bool "Distribute interrupts on all CPUs by default"
608 depends on SMP
609 help
610 This option gives the kernel permission to distribute IRQs across
611 multiple CPUs. Saying N here will route all IRQs to the first
612 CPU. Generally saying Y is safe, although some problems have been
613 reported with SMP Power Macintoshes with this option enabled.
614
615config NUMA
616 bool "NUMA support"
617 depends on PPC64
618 default y if SMP && PPC_PSERIES
619
620config NODES_SHIFT
621 int
622 default "8" if PPC64
623 default "4"
624 depends on NEED_MULTIPLE_NODES
625
626config USE_PERCPU_NUMA_NODE_ID
627 def_bool y
628 depends on NUMA
629
630config HAVE_MEMORYLESS_NODES
631 def_bool y
632 depends on NUMA
633
634config ARCH_SELECT_MEMORY_MODEL
635 def_bool y
636 depends on PPC64
637
638config ARCH_FLATMEM_ENABLE
639 def_bool y
640 depends on (PPC64 && !NUMA) || PPC32
641
642config ARCH_SPARSEMEM_ENABLE
643 def_bool y
644 depends on PPC64
645 select SPARSEMEM_VMEMMAP_ENABLE
646
647config ARCH_SPARSEMEM_DEFAULT
648 def_bool y
Googler9398cc32022-12-02 17:21:52 +0800649 depends on PPC_BOOK3S_64
Googleraf606d22022-10-26 21:40:12 -0700650
651config SYS_SUPPORTS_HUGETLBFS
652 bool
653
Googler9398cc32022-12-02 17:21:52 +0800654config ILLEGAL_POINTER_VALUE
655 hex
656 # This is roughly half way between the top of user space and the bottom
657 # of kernel space, which seems about as good as we can get.
658 default 0x5deadbeef0000000 if PPC64
659 default 0
Googleraf606d22022-10-26 21:40:12 -0700660
661config ARCH_MEMORY_PROBE
662 def_bool y
663 depends on MEMORY_HOTPLUG
664
665# Some NUMA nodes have memory ranges that span
666# other nodes. Even though a pfn is valid and
667# between a node's start and end pfns, it may not
668# reside on that node. See memmap_init_zone()
669# for details.
670config NODES_SPAN_OTHER_NODES
671 def_bool y
672 depends on NEED_MULTIPLE_NODES
673
674config STDBINUTILS
675 bool "Using standard binutils settings"
676 depends on 44x
677 default y
678 help
679 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
680 Note, that kernel will be able to run only those applications,
681 which had been compiled using binutils later than 2.17.50.0.3 with
682 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
683 the older binutils, you can patch them with a trivial patch, which
684 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
685
686choice
687 prompt "Page size"
688 default PPC_4K_PAGES
689 help
690 Select the kernel logical page size. Increasing the page size
691 will reduce software overhead at each page boundary, allow
692 hardware prefetch mechanisms to be more effective, and allow
693 larger dma transfers increasing IO efficiency and reducing
694 overhead. However the utilization of memory will increase.
695 For example, each cached file will using a multiple of the
696 page size to hold its contents and the difference between the
697 end of file and the end of page is wasted.
698
699 Some dedicated systems, such as software raid serving with
700 accelerated calculations, have shown significant increases.
701
702 If you configure a 64 bit kernel for 64k pages but the
703 processor does not support them, then the kernel will simulate
704 them with 4k pages, loading them on demand, but with the
705 reduced software overhead and larger internal fragmentation.
706 For the 32 bit kernel, a large page option will not be offered
707 unless it is supported by the configured processor.
708
709 If unsure, choose 4K_PAGES.
710
711config PPC_4K_PAGES
712 bool "4k page size"
713 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
714
715config PPC_16K_PAGES
716 bool "16k page size"
717 depends on 44x || PPC_8xx
718
719config PPC_64K_PAGES
720 bool "64k page size"
Googler9398cc32022-12-02 17:21:52 +0800721 depends on 44x || PPC_BOOK3S_64
Googleraf606d22022-10-26 21:40:12 -0700722 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
723
724config PPC_256K_PAGES
725 bool "256k page size"
Googlerb48fa912023-03-17 12:40:29 +0530726 depends on 44x && !STDBINUTILS
Googleraf606d22022-10-26 21:40:12 -0700727 help
728 Make the page size 256k.
729
730 As the ELF standard only requires alignment to support page
731 sizes up to 64k, you will need to compile all of your user
732 space applications with a non-standard binutils settings
733 (see the STDBINUTILS description for details).
734
735 Say N unless you know what you are doing.
736
737endchoice
738
Googler9398cc32022-12-02 17:21:52 +0800739config PPC_PAGE_SHIFT
740 int
741 default 18 if PPC_256K_PAGES
742 default 16 if PPC_64K_PAGES
743 default 14 if PPC_16K_PAGES
744 default 12
745
746config THREAD_SHIFT
747 int "Thread shift" if EXPERT
748 range 13 15
749 default "15" if PPC_256K_PAGES
750 default "14" if PPC64
751 default "14" if KASAN
752 default "13"
753 help
754 Used to define the stack size. The default is almost always what you
755 want. Only change this if you know what you are doing.
756
757config ETEXT_SHIFT_BOOL
758 bool "Set custom etext alignment" if STRICT_KERNEL_RWX && \
759 (PPC_BOOK3S_32 || PPC_8xx)
760 depends on ADVANCED_OPTIONS
761 help
762 This option allows you to set the kernel end of text alignment. When
763 RAM is mapped by blocks, the alignment needs to fit the size and
764 number of possible blocks. The default should be OK for most configs.
765
766 Say N here unless you know what you are doing.
767
768config ETEXT_SHIFT
769 int "_etext shift" if ETEXT_SHIFT_BOOL
770 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
771 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
772 default 17 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
773 default 19 if STRICT_KERNEL_RWX && PPC_8xx
774 default PPC_PAGE_SHIFT
775 help
776 On Book3S 32 (603+), IBATs are used to map kernel text.
777 Smaller is the alignment, greater is the number of necessary IBATs.
778
779 On 8xx, large pages (512kb or 8M) are used to map kernel linear
780 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
781 in that case.
782
783config DATA_SHIFT_BOOL
784 bool "Set custom data alignment" if STRICT_KERNEL_RWX && \
785 (PPC_BOOK3S_32 || PPC_8xx)
786 depends on ADVANCED_OPTIONS
787 help
788 This option allows you to set the kernel data alignment. When
789 RAM is mapped by blocks, the alignment needs to fit the size and
790 number of possible blocks. The default should be OK for most configs.
791
792 Say N here unless you know what you are doing.
793
794config DATA_SHIFT
795 int "Data shift" if DATA_SHIFT_BOOL
796 default 24 if STRICT_KERNEL_RWX && PPC64
797 range 17 28 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
798 range 19 23 if STRICT_KERNEL_RWX && PPC_8xx
799 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
800 default 23 if STRICT_KERNEL_RWX && PPC_8xx
801 default PPC_PAGE_SHIFT
802 help
803 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
804 Smaller is the alignment, greater is the number of necessary DBATs.
805
806 On 8xx, large pages (512kb or 8M) are used to map kernel linear
807 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
808 in that case.
809
Googleraf606d22022-10-26 21:40:12 -0700810config FORCE_MAX_ZONEORDER
811 int "Maximum zone order"
812 range 8 9 if PPC64 && PPC_64K_PAGES
813 default "9" if PPC64 && PPC_64K_PAGES
814 range 13 13 if PPC64 && !PPC_64K_PAGES
815 default "13" if PPC64 && !PPC_64K_PAGES
816 range 9 64 if PPC32 && PPC_16K_PAGES
817 default "9" if PPC32 && PPC_16K_PAGES
818 range 7 64 if PPC32 && PPC_64K_PAGES
819 default "7" if PPC32 && PPC_64K_PAGES
820 range 5 64 if PPC32 && PPC_256K_PAGES
821 default "5" if PPC32 && PPC_256K_PAGES
822 range 11 64
823 default "11"
824 help
825 The kernel memory allocator divides physically contiguous memory
826 blocks into "zones", where each zone is a power of two number of
827 pages. This option selects the largest power of two that the kernel
828 keeps in the memory allocator. If you need to allocate very large
829 blocks of physically contiguous memory, then you may need to
830 increase this value.
831
832 This config option is actually maximum order plus one. For example,
833 a value of 11 means that the largest free memory block is 2^10 pages.
834
835 The page size is not necessarily 4KB. For example, on 64-bit
836 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
837 this in mind when choosing a value for this option.
838
839config PPC_SUBPAGE_PROT
840 bool "Support setting protections for 4k subpages"
Googler9398cc32022-12-02 17:21:52 +0800841 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
Googleraf606d22022-10-26 21:40:12 -0700842 help
843 This option adds support for a system call to allow user programs
844 to set access permissions (read/write, readonly, or no access)
845 on the 4k subpages of each 64k page.
846
847config PPC_COPRO_BASE
848 bool
Googleraf606d22022-10-26 21:40:12 -0700849
850config SCHED_SMT
851 bool "SMT (Hyperthreading) scheduler support"
852 depends on PPC64 && SMP
853 help
854 SMT scheduler support improves the CPU scheduler's decision making
855 when dealing with POWER5 cpus at a cost of slightly increased
856 overhead in some places. If unsure say N here.
857
858config PPC_DENORMALISATION
859 bool "PowerPC denormalisation exception handling"
860 depends on PPC_BOOK3S_64
861 default "y" if PPC_POWERNV
Googler9398cc32022-12-02 17:21:52 +0800862 help
Googleraf606d22022-10-26 21:40:12 -0700863 Add support for handling denormalisation of single precision
864 values. Useful for bare metal only. If unsure say Y here.
865
866config CMDLINE_BOOL
867 bool "Default bootloader kernel arguments"
868
869config CMDLINE
Googler9398cc32022-12-02 17:21:52 +0800870 string "Initial kernel command string" if CMDLINE_BOOL
871 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" if CMDLINE_BOOL
872 default ""
Googleraf606d22022-10-26 21:40:12 -0700873 help
874 On some platforms, there is currently no way for the boot loader to
875 pass arguments to the kernel. For these platforms, you can supply
876 some command-line options at build time by entering them here. In
877 most cases you will need to specify the root device here.
878
879config CMDLINE_FORCE
880 bool "Always use the default kernel command string"
881 depends on CMDLINE_BOOL
882 help
883 Always use the default kernel command string, even if the boot
884 loader passes other arguments to the kernel.
885 This is useful if you cannot or don't want to change the
886 command-line options your boot loader passes to the kernel.
887
888config EXTRA_TARGETS
889 string "Additional default image types"
890 help
891 List additional targets to be built by the bootwrapper here (separated
892 by spaces). This is useful for targets that depend of device tree
893 files in the .dts directory.
894
895 Targets in this list will be build as part of the default build
896 target, or when the user does a 'make zImage' or a
897 'make zImage.initrd'.
898
899 If unsure, leave blank
900
901config ARCH_WANTS_FREEZER_CONTROL
902 def_bool y
903 depends on ADB_PMU
904
Googler9398cc32022-12-02 17:21:52 +0800905source "kernel/power/Kconfig"
Googleraf606d22022-10-26 21:40:12 -0700906
907config SECCOMP
908 bool "Enable seccomp to safely compute untrusted bytecode"
909 depends on PROC_FS
910 default y
911 help
912 This kernel feature is useful for number crunching applications
913 that may need to compute untrusted bytecode during their
914 execution. By using pipes or other transports made available to
915 the process as file descriptors supporting the read/write
916 syscalls, it's possible to isolate those applications in
917 their own address space using seccomp. Once seccomp is
918 enabled via /proc/<pid>/seccomp, it cannot be disabled
919 and the task is only allowed to execute a few safe syscalls
920 defined by each seccomp mode.
921
922 If unsure, say Y. Only embedded should say N here.
923
Googler9398cc32022-12-02 17:21:52 +0800924config PPC_MEM_KEYS
925 prompt "PowerPC Memory Protection Keys"
926 def_bool y
927 depends on PPC_BOOK3S_64
928 select ARCH_USES_HIGH_VMA_FLAGS
929 select ARCH_HAS_PKEYS
930 help
931 Memory Protection Keys provides a mechanism for enforcing
932 page-based protections, but without requiring modification of the
933 page tables when an application changes protection domains.
934
935 For details, see Documentation/core-api/protection-keys.rst
936
937 If unsure, say y.
938
Googleraf606d22022-10-26 21:40:12 -0700939endmenu
940
941config ISA_DMA_API
942 bool
943 default PCI
944
945menu "Bus options"
946
947config ISA
948 bool "Support for ISA-bus hardware"
949 depends on PPC_CHRP
950 select PPC_I8259
951 help
952 Find out whether you have ISA slots on your motherboard. ISA is the
953 name of a bus system, i.e. the way the CPU talks to the other stuff
954 inside your box. If you have an Apple machine, say N here; if you
955 have an IBM RS/6000 or pSeries machine, say Y. If you have an
956 embedded board, consult your board documentation.
957
Googleraf606d22022-10-26 21:40:12 -0700958config GENERIC_ISA_DMA
959 bool
960 depends on ISA_DMA_API
961 default y
962
963config PPC_INDIRECT_PCI
964 bool
965 depends on PCI
966 default y if 40x || 44x
Googleraf606d22022-10-26 21:40:12 -0700967
968config SBUS
969 bool
970
971config FSL_SOC
972 bool
973
974config FSL_PCI
Googler9398cc32022-12-02 17:21:52 +0800975 bool
976 select ARCH_HAS_DMA_SET_MASK
Googleraf606d22022-10-26 21:40:12 -0700977 select PPC_INDIRECT_PCI
978 select PCI_QUIRKS
979
980config FSL_PMC
981 bool
982 default y
983 depends on SUSPEND && (PPC_85xx || PPC_86xx)
984 help
985 Freescale MPC85xx/MPC86xx power management controller support
986 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
987
988config PPC4xx_CPM
989 bool
990 default y
991 depends on SUSPEND && (44x || 40x)
992 help
993 PPC4xx Clock Power Management (CPM) support (suspend/resume).
994 It also enables support for two different idle states (idle-wait
995 and idle-doze).
996
997config 4xx_SOC
998 bool
999
1000config FSL_LBC
1001 bool "Freescale Local Bus support"
1002 help
1003 Enables reporting of errors from the Freescale local bus
1004 controller. Also contains some common code used by
1005 drivers for specific local bus peripherals.
1006
1007config FSL_GTM
1008 bool
1009 depends on PPC_83xx || QUICC_ENGINE || CPM2
1010 help
1011 Freescale General-purpose Timers support
1012
Googleraf606d22022-10-26 21:40:12 -07001013config PCI_8260
1014 bool
1015 depends on PCI && 8260
1016 select PPC_INDIRECT_PCI
1017 default y
1018
Googleraf606d22022-10-26 21:40:12 -07001019config FSL_RIO
1020 bool "Freescale Embedded SRIO Controller support"
Googler9398cc32022-12-02 17:21:52 +08001021 depends on RAPIDIO = y && HAVE_RAPIDIO
Googleraf606d22022-10-26 21:40:12 -07001022 default "n"
Googler9398cc32022-12-02 17:21:52 +08001023 help
Googleraf606d22022-10-26 21:40:12 -07001024 Include support for RapidIO controller on Freescale embedded
1025 processors (MPC8548, MPC8641, etc).
1026
Googler9398cc32022-12-02 17:21:52 +08001027config PPC_RTAS_FILTER
1028 bool "Enable filtering of RTAS syscalls"
1029 default y
1030 depends on PPC_RTAS
1031 help
1032 The RTAS syscall API has security issues that could be used to
1033 compromise system integrity. This option enforces restrictions on the
1034 RTAS calls and arguments passed by userspace programs to mitigate
1035 these issues.
1036
1037 Say Y unless you know what you are doing and the filter is causing
1038 problems for you.
Googleraf606d22022-10-26 21:40:12 -07001039
1040endmenu
1041
1042config NONSTATIC_KERNEL
1043 bool
Googleraf606d22022-10-26 21:40:12 -07001044
1045menu "Advanced setup"
1046 depends on PPC32
1047
1048config ADVANCED_OPTIONS
1049 bool "Prompt for advanced kernel configuration options"
1050 help
1051 This option will enable prompting for a variety of advanced kernel
1052 configuration options. These options can cause the kernel to not
1053 work if they are set incorrectly, but can be used to optimize certain
1054 aspects of kernel memory management.
1055
1056 Unless you know what you are doing, say N here.
1057
1058comment "Default settings for advanced configuration options are used"
1059 depends on !ADVANCED_OPTIONS
1060
1061config LOWMEM_SIZE_BOOL
1062 bool "Set maximum low memory"
1063 depends on ADVANCED_OPTIONS
1064 help
1065 This option allows you to set the maximum amount of memory which
1066 will be used as "low memory", that is, memory which the kernel can
1067 access directly, without having to set up a kernel virtual mapping.
1068 This can be useful in optimizing the layout of kernel virtual
1069 memory.
1070
1071 Say N here unless you know what you are doing.
1072
1073config LOWMEM_SIZE
1074 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1075 default "0x30000000"
1076
1077config LOWMEM_CAM_NUM_BOOL
1078 bool "Set number of CAMs to use to map low memory"
1079 depends on ADVANCED_OPTIONS && FSL_BOOKE
1080 help
1081 This option allows you to set the maximum number of CAM slots that
1082 will be used to map low memory. There are a limited number of slots
1083 available and even more limited number that will fit in the L1 MMU.
1084 However, using more entries will allow mapping more low memory. This
1085 can be useful in optimizing the layout of kernel virtual memory.
1086
1087 Say N here unless you know what you are doing.
1088
1089config LOWMEM_CAM_NUM
1090 depends on FSL_BOOKE
1091 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1092 default 3
1093
1094config DYNAMIC_MEMSTART
1095 bool "Enable page aligned dynamic load address for kernel"
1096 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1097 select NONSTATIC_KERNEL
1098 help
1099 This option enables the kernel to be loaded at any page aligned
Googler9398cc32022-12-02 17:21:52 +08001100 physical address. The kernel creates a mapping from KERNELBASE to
Googleraf606d22022-10-26 21:40:12 -07001101 the address where the kernel is loaded. The page size here implies
1102 the TLB page size of the mapping for kernel on the particular platform.
1103 Please refer to the init code for finding the TLB page size.
1104
1105 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1106 kernel image, where the only restriction is the page aligned kernel
Googler9398cc32022-12-02 17:21:52 +08001107 load address. When this option is enabled, the compile time physical
Googleraf606d22022-10-26 21:40:12 -07001108 address CONFIG_PHYSICAL_START is ignored.
1109
1110 This option is overridden by CONFIG_RELOCATABLE
1111
1112config PAGE_OFFSET_BOOL
1113 bool "Set custom page offset address"
1114 depends on ADVANCED_OPTIONS
1115 help
1116 This option allows you to set the kernel virtual address at which
1117 the kernel will map low memory. This can be useful in optimizing
1118 the virtual memory layout of the system.
1119
1120 Say N here unless you know what you are doing.
1121
1122config PAGE_OFFSET
1123 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1124 default "0xc0000000"
1125
1126config KERNEL_START_BOOL
1127 bool "Set custom kernel base address"
1128 depends on ADVANCED_OPTIONS
1129 help
1130 This option allows you to set the kernel virtual address at which
1131 the kernel will be loaded. Normally this should match PAGE_OFFSET
1132 however there are times (like kdump) that one might not want them
1133 to be the same.
1134
1135 Say N here unless you know what you are doing.
1136
1137config KERNEL_START
1138 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1139 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1140 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1141 default "0xc0000000"
1142
1143config PHYSICAL_START_BOOL
1144 bool "Set physical address where the kernel is loaded"
1145 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1146 help
1147 This gives the physical address where the kernel is loaded.
1148
1149 Say N here unless you know what you are doing.
1150
1151config PHYSICAL_START
1152 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
Googler9398cc32022-12-02 17:21:52 +08001153 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
Googleraf606d22022-10-26 21:40:12 -07001154 default "0x00000000"
1155
1156config PHYSICAL_ALIGN
1157 hex
1158 default "0x04000000" if FSL_BOOKE
1159 help
1160 This value puts the alignment restrictions on physical address
1161 where kernel is loaded and run from. Kernel is compiled for an
1162 address which meets above alignment restriction.
1163
1164config TASK_SIZE_BOOL
1165 bool "Set custom user task size"
1166 depends on ADVANCED_OPTIONS
1167 help
1168 This option allows you to set the amount of virtual address space
1169 allocated to user tasks. This can be useful in optimizing the
1170 virtual memory layout of the system.
1171
1172 Say N here unless you know what you are doing.
1173
1174config TASK_SIZE
1175 hex "Size of user task space" if TASK_SIZE_BOOL
1176 default "0x80000000" if PPC_8xx
1177 default "0xc0000000"
1178
Googleraf606d22022-10-26 21:40:12 -07001179config PIN_TLB
1180 bool "Pinned Kernel TLBs (860 ONLY)"
Googler9398cc32022-12-02 17:21:52 +08001181 depends on ADVANCED_OPTIONS && PPC_8xx && \
1182 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1183
1184config PIN_TLB_DATA
1185 bool "Pinned TLB for DATA"
1186 depends on PIN_TLB
1187 default y
Googleraf606d22022-10-26 21:40:12 -07001188
1189config PIN_TLB_IMMR
1190 bool "Pinned TLB for IMMR"
Googler9398cc32022-12-02 17:21:52 +08001191 depends on PIN_TLB || PPC_EARLY_DEBUG_CPM
1192 default y
1193
1194config PIN_TLB_TEXT
1195 bool "Pinned TLB for TEXT"
Googleraf606d22022-10-26 21:40:12 -07001196 depends on PIN_TLB
1197 default y
1198endmenu
1199
1200if PPC64
1201# This value must have zeroes in the bottom 60 bits otherwise lots will break
1202config PAGE_OFFSET
1203 hex
1204 default "0xc000000000000000"
1205config KERNEL_START
1206 hex
1207 default "0xc000000000000000"
1208config PHYSICAL_START
1209 hex
1210 default "0x00000000"
1211endif
1212
1213config ARCH_RANDOM
1214 def_bool n
1215
Googleraf606d22022-10-26 21:40:12 -07001216config PPC_LIB_RHEAP
1217 bool
1218
1219source "arch/powerpc/kvm/Kconfig"
1220
1221source "kernel/livepatch/Kconfig"