xref: /openbmc/linux/arch/riscv/Kconfig (revision 9e6bfd42b14b45737cae8bc84c759f1874949b8b)
1# SPDX-License-Identifier: GPL-2.0-only
2#
3# For a description of the syntax of this configuration file,
4# see Documentation/kbuild/kconfig-language.rst.
5#
6
7config 64BIT
8	bool
9
10config 32BIT
11	bool
12
13config RISCV
14	def_bool y
15	select ARCH_ENABLE_HUGEPAGE_MIGRATION if HUGETLB_PAGE && MIGRATION
16	select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
17	select ARCH_HAS_BINFMT_FLAT
18	select ARCH_HAS_CURRENT_STACK_POINTER
19	select ARCH_HAS_DEBUG_VM_PGTABLE
20	select ARCH_HAS_DEBUG_VIRTUAL if MMU
21	select ARCH_HAS_DEBUG_WX
22	select ARCH_HAS_FORTIFY_SOURCE
23	select ARCH_HAS_GCOV_PROFILE_ALL
24	select ARCH_HAS_GIGANTIC_PAGE
25	select ARCH_HAS_KCOV
26	select ARCH_HAS_MMIOWB
27	select ARCH_HAS_PMEM_API
28	select ARCH_HAS_PTE_SPECIAL
29	select ARCH_HAS_SET_DIRECT_MAP if MMU
30	select ARCH_HAS_SET_MEMORY if MMU
31	select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL
32	select ARCH_HAS_STRICT_MODULE_RWX if MMU && !XIP_KERNEL
33	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
34	select ARCH_HAS_UBSAN_SANITIZE_ALL
35	select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
36	select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
37	select ARCH_STACKWALK
38	select ARCH_SUPPORTS_ATOMIC_RMW
39	select ARCH_SUPPORTS_DEBUG_PAGEALLOC if MMU
40	select ARCH_SUPPORTS_HUGETLBFS if MMU
41	select ARCH_SUPPORTS_PAGE_TABLE_CHECK if MMU
42	select ARCH_USE_MEMTEST
43	select ARCH_USE_QUEUED_RWLOCKS
44	select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
45	select ARCH_WANT_FRAME_POINTERS
46	select ARCH_WANT_GENERAL_HUGETLB
47	select ARCH_WANT_HUGE_PMD_SHARE if 64BIT
48	select ARCH_WANTS_THP_SWAP if HAVE_ARCH_TRANSPARENT_HUGEPAGE
49	select BINFMT_FLAT_NO_DATA_START_OFFSET if !MMU
50	select BUILDTIME_TABLE_SORT if MMU
51	select CLONE_BACKWARDS
52	select CLINT_TIMER if !MMU
53	select COMMON_CLK
54	select CPU_PM if CPU_IDLE
55	select EDAC_SUPPORT
56	select GENERIC_ARCH_TOPOLOGY
57	select GENERIC_ATOMIC64 if !64BIT
58	select GENERIC_CLOCKEVENTS_BROADCAST if SMP
59	select GENERIC_EARLY_IOREMAP
60	select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO
61	select GENERIC_IDLE_POLL_SETUP
62	select GENERIC_IOREMAP if MMU
63	select GENERIC_IRQ_MULTI_HANDLER
64	select GENERIC_IRQ_SHOW
65	select GENERIC_IRQ_SHOW_LEVEL
66	select GENERIC_LIB_DEVMEM_IS_ALLOWED
67	select GENERIC_PCI_IOMAP
68	select GENERIC_PTDUMP if MMU
69	select GENERIC_SCHED_CLOCK
70	select GENERIC_SMP_IDLE_THREAD
71	select GENERIC_TIME_VSYSCALL if MMU && 64BIT
72	select GENERIC_VDSO_TIME_NS if HAVE_GENERIC_VDSO
73	select HARDIRQS_SW_RESEND
74	select HAVE_ARCH_AUDITSYSCALL
75	select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP
76	select HAVE_ARCH_HUGE_VMAP if MMU && 64BIT && !XIP_KERNEL
77	select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
78	select HAVE_ARCH_JUMP_LABEL_RELATIVE if !XIP_KERNEL
79	select HAVE_ARCH_KASAN if MMU && 64BIT
80	select HAVE_ARCH_KASAN_VMALLOC if MMU && 64BIT
81	select HAVE_ARCH_KFENCE if MMU && 64BIT
82	select HAVE_ARCH_KGDB if !XIP_KERNEL
83	select HAVE_ARCH_KGDB_QXFER_PKT
84	select HAVE_ARCH_MMAP_RND_BITS if MMU
85	select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
86	select HAVE_ARCH_SECCOMP_FILTER
87	select HAVE_ARCH_TRACEHOOK
88	select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT && MMU
89	select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE
90	select HAVE_ARCH_THREAD_STRUCT_WHITELIST
91	select HAVE_ARCH_VMAP_STACK if MMU && 64BIT
92	select HAVE_ASM_MODVERSIONS
93	select HAVE_CONTEXT_TRACKING_USER
94	select HAVE_DEBUG_KMEMLEAK
95	select HAVE_DMA_CONTIGUOUS if MMU
96	select HAVE_EBPF_JIT if MMU
97	select HAVE_FUNCTION_ERROR_INJECTION
98	select HAVE_GCC_PLUGINS
99	select HAVE_GENERIC_VDSO if MMU && 64BIT
100	select HAVE_IRQ_TIME_ACCOUNTING
101	select HAVE_KPROBES if !XIP_KERNEL
102	select HAVE_KPROBES_ON_FTRACE if !XIP_KERNEL
103	select HAVE_KRETPROBES if !XIP_KERNEL
104	select HAVE_RETHOOK if !XIP_KERNEL
105	select HAVE_MOVE_PMD
106	select HAVE_MOVE_PUD
107	select HAVE_PCI
108	select HAVE_PERF_EVENTS
109	select HAVE_PERF_REGS
110	select HAVE_PERF_USER_STACK_DUMP
111	select HAVE_POSIX_CPU_TIMERS_TASK_WORK
112	select HAVE_REGS_AND_STACK_ACCESS_API
113	select HAVE_FUNCTION_ARG_ACCESS_API
114	select HAVE_STACKPROTECTOR
115	select HAVE_SYSCALL_TRACEPOINTS
116	select HAVE_RSEQ
117	select IRQ_DOMAIN
118	select IRQ_FORCED_THREADING
119	select MODULES_USE_ELF_RELA if MODULES
120	select MODULE_SECTIONS if MODULES
121	select OF
122	select OF_DMA_DEFAULT_COHERENT
123	select OF_EARLY_FLATTREE
124	select OF_IRQ
125	select PCI_DOMAINS_GENERIC if PCI
126	select PCI_MSI if PCI
127	select RISCV_INTC
128	select RISCV_TIMER if RISCV_SBI
129	select SIFIVE_PLIC
130	select SPARSE_IRQ
131	select SYSCTL_EXCEPTION_TRACE
132	select THREAD_INFO_IN_TASK
133	select TRACE_IRQFLAGS_SUPPORT
134	select UACCESS_MEMCPY if !MMU
135	select ZONE_DMA32 if 64BIT
136	select HAVE_DYNAMIC_FTRACE if !XIP_KERNEL && MMU && $(cc-option,-fpatchable-function-entry=8)
137	select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE
138	select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL
139	select HAVE_FUNCTION_GRAPH_TRACER
140	select HAVE_FUNCTION_TRACER if !XIP_KERNEL
141
142config ARCH_MMAP_RND_BITS_MIN
143	default 18 if 64BIT
144	default 8
145
146config ARCH_MMAP_RND_COMPAT_BITS_MIN
147	default 8
148
149# max bits determined by the following formula:
150#  VA_BITS - PAGE_SHIFT - 3
151config ARCH_MMAP_RND_BITS_MAX
152	default 24 if 64BIT # SV39 based
153	default 17
154
155config ARCH_MMAP_RND_COMPAT_BITS_MAX
156	default 17
157
158# set if we run in machine mode, cleared if we run in supervisor mode
159config RISCV_M_MODE
160	bool
161	default !MMU
162
163# set if we are running in S-mode and can use SBI calls
164config RISCV_SBI
165	bool
166	depends on !RISCV_M_MODE
167	default y
168
169config MMU
170	bool "MMU-based Paged Memory Management Support"
171	default y
172	help
173	  Select if you want MMU-based virtualised addressing space
174	  support by paged memory management. If unsure, say 'Y'.
175
176config PAGE_OFFSET
177	hex
178	default 0xC0000000 if 32BIT
179	default 0x80000000 if 64BIT && !MMU
180	default 0xff60000000000000 if 64BIT
181
182config KASAN_SHADOW_OFFSET
183	hex
184	depends on KASAN_GENERIC
185	default 0xdfffffff00000000 if 64BIT
186	default 0xffffffff if 32BIT
187
188config ARCH_FLATMEM_ENABLE
189	def_bool !NUMA
190
191config ARCH_SPARSEMEM_ENABLE
192	def_bool y
193	depends on MMU
194	select SPARSEMEM_STATIC if 32BIT && SPARSEMEM
195	select SPARSEMEM_VMEMMAP_ENABLE if 64BIT
196
197config ARCH_SELECT_MEMORY_MODEL
198	def_bool ARCH_SPARSEMEM_ENABLE
199
200config ARCH_SUPPORTS_UPROBES
201	def_bool y
202
203config STACKTRACE_SUPPORT
204	def_bool y
205
206config GENERIC_BUG
207	def_bool y
208	depends on BUG
209	select GENERIC_BUG_RELATIVE_POINTERS if 64BIT
210
211config GENERIC_BUG_RELATIVE_POINTERS
212	bool
213
214config GENERIC_CALIBRATE_DELAY
215	def_bool y
216
217config GENERIC_CSUM
218	def_bool y
219
220config GENERIC_HWEIGHT
221	def_bool y
222
223config FIX_EARLYCON_MEM
224	def_bool MMU
225
226config PGTABLE_LEVELS
227	int
228	default 5 if 64BIT
229	default 2
230
231config LOCKDEP_SUPPORT
232	def_bool y
233
234config RISCV_DMA_NONCOHERENT
235	bool
236	select ARCH_HAS_DMA_PREP_COHERENT
237	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
238	select ARCH_HAS_SYNC_DMA_FOR_CPU
239	select ARCH_HAS_SETUP_DMA_OPS
240	select DMA_DIRECT_REMAP
241
242config AS_HAS_INSN
243	def_bool $(as-instr,.insn r 51$(comma) 0$(comma) 0$(comma) t0$(comma) t0$(comma) zero)
244
245source "arch/riscv/Kconfig.socs"
246source "arch/riscv/Kconfig.erratas"
247
248menu "Platform type"
249
250config NONPORTABLE
251	bool "Allow configurations that result in non-portable kernels"
252	help
253	  RISC-V kernel binaries are compatible between all known systems
254	  whenever possible, but there are some use cases that can only be
255	  satisfied by configurations that result in kernel binaries that are
256	  not portable between systems.
257
258	  Selecting N does not guarantee kernels will be portable to all known
259	  systems.  Selecting any of the options guarded by NONPORTABLE will
260	  result in kernel binaries that are unlikely to be portable between
261	  systems.
262
263	  If unsure, say N.
264
265choice
266	prompt "Base ISA"
267	default ARCH_RV64I
268	help
269	  This selects the base ISA that this kernel will target and must match
270	  the target platform.
271
272config ARCH_RV32I
273	bool "RV32I"
274	depends on NONPORTABLE
275	select 32BIT
276	select GENERIC_LIB_ASHLDI3
277	select GENERIC_LIB_ASHRDI3
278	select GENERIC_LIB_LSHRDI3
279	select GENERIC_LIB_UCMPDI2
280	select MMU
281
282config ARCH_RV64I
283	bool "RV64I"
284	select 64BIT
285	select ARCH_SUPPORTS_INT128 if CC_HAS_INT128
286	select SWIOTLB if MMU
287
288endchoice
289
290# We must be able to map all physical memory into the kernel, but the compiler
291# is still a bit more efficient when generating code if it's setup in a manner
292# such that it can only map 2GiB of memory.
293choice
294	prompt "Kernel Code Model"
295	default CMODEL_MEDLOW if 32BIT
296	default CMODEL_MEDANY if 64BIT
297
298	config CMODEL_MEDLOW
299		bool "medium low code model"
300	config CMODEL_MEDANY
301		bool "medium any code model"
302endchoice
303
304config MODULE_SECTIONS
305	bool
306	select HAVE_MOD_ARCH_SPECIFIC
307
308config SMP
309	bool "Symmetric Multi-Processing"
310	help
311	  This enables support for systems with more than one CPU.  If
312	  you say N here, the kernel will run on single and
313	  multiprocessor machines, but will use only one CPU of a
314	  multiprocessor machine. If you say Y here, the kernel will run
315	  on many, but not all, single processor machines. On a single
316	  processor machine, the kernel will run faster if you say N
317	  here.
318
319	  If you don't know what to do here, say N.
320
321config NR_CPUS
322	int "Maximum number of CPUs (2-512)"
323	depends on SMP
324	range 2 512 if !RISCV_SBI_V01
325	range 2 32 if RISCV_SBI_V01 && 32BIT
326	range 2 64 if RISCV_SBI_V01 && 64BIT
327	default "32" if 32BIT
328	default "64" if 64BIT
329
330config HOTPLUG_CPU
331	bool "Support for hot-pluggable CPUs"
332	depends on SMP
333	select GENERIC_IRQ_MIGRATION
334	help
335
336	  Say Y here to experiment with turning CPUs off and on.  CPUs
337	  can be controlled through /sys/devices/system/cpu.
338
339	  Say N if you want to disable CPU hotplug.
340
341choice
342	prompt "CPU Tuning"
343	default TUNE_GENERIC
344
345config TUNE_GENERIC
346	bool "generic"
347
348endchoice
349
350# Common NUMA Features
351config NUMA
352	bool "NUMA Memory Allocation and Scheduler Support"
353	depends on SMP && MMU
354	select GENERIC_ARCH_NUMA
355	select OF_NUMA
356	select ARCH_SUPPORTS_NUMA_BALANCING
357	select USE_PERCPU_NUMA_NODE_ID
358	select NEED_PER_CPU_EMBED_FIRST_CHUNK
359	help
360	  Enable NUMA (Non-Uniform Memory Access) support.
361
362	  The kernel will try to allocate memory used by a CPU on the
363	  local memory of the CPU and add some more NUMA awareness to the kernel.
364
365config NODES_SHIFT
366	int "Maximum NUMA Nodes (as a power of 2)"
367	range 1 10
368	default "2"
369	depends on NUMA
370	help
371	  Specify the maximum number of NUMA Nodes available on the target
372	  system.  Increases memory reserved to accommodate various tables.
373
374config RISCV_ALTERNATIVE
375	bool
376	depends on !XIP_KERNEL
377	help
378	  This Kconfig allows the kernel to automatically patch the
379	  errata required by the execution platform at run time. The
380	  code patching is performed once in the boot stages. It means
381	  that the overhead from this mechanism is just taken once.
382
383config RISCV_ALTERNATIVE_EARLY
384	bool
385	depends on RISCV_ALTERNATIVE
386	help
387	  Allows early patching of the kernel for special errata
388
389config RISCV_ISA_C
390	bool "Emit compressed instructions when building Linux"
391	default y
392	help
393	  Adds "C" to the ISA subsets that the toolchain is allowed to emit
394	  when building Linux, which results in compressed instructions in the
395	  Linux binary.
396
397	  If you don't know what to do here, say Y.
398
399config RISCV_ISA_SVPBMT
400	bool "SVPBMT extension support"
401	depends on 64BIT && MMU
402	depends on !XIP_KERNEL
403	select RISCV_ALTERNATIVE
404	default y
405	help
406	   Adds support to dynamically detect the presence of the SVPBMT
407	   ISA-extension (Supervisor-mode: page-based memory types) and
408	   enable its usage.
409
410	   The memory type for a page contains a combination of attributes
411	   that indicate the cacheability, idempotency, and ordering
412	   properties for access to that page.
413
414	   The SVPBMT extension is only available on 64Bit cpus.
415
416	   If you don't know what to do here, say Y.
417
418config TOOLCHAIN_HAS_ZICBOM
419	bool
420	default y
421	depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zicbom)
422	depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zicbom)
423	depends on LLD_VERSION >= 150000 || LD_VERSION >= 23800
424
425config RISCV_ISA_ZICBOM
426	bool "Zicbom extension support for non-coherent DMA operation"
427	depends on TOOLCHAIN_HAS_ZICBOM
428	depends on !XIP_KERNEL && MMU
429	select RISCV_DMA_NONCOHERENT
430	select RISCV_ALTERNATIVE
431	default y
432	help
433	   Adds support to dynamically detect the presence of the ZICBOM
434	   extension (Cache Block Management Operations) and enable its
435	   usage.
436
437	   The Zicbom extension can be used to handle for example
438	   non-coherent DMA support on devices that need it.
439
440	   If you don't know what to do here, say Y.
441
442config TOOLCHAIN_HAS_ZIHINTPAUSE
443	bool
444	default y
445	depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zihintpause)
446	depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zihintpause)
447	depends on LLD_VERSION >= 150000 || LD_VERSION >= 23600
448
449config FPU
450	bool "FPU support"
451	default y
452	help
453	  Say N here if you want to disable all floating-point related procedure
454	  in the kernel.
455
456	  If you don't know what to do here, say Y.
457
458endmenu # "Platform type"
459
460menu "Kernel features"
461
462source "kernel/Kconfig.hz"
463
464config RISCV_SBI_V01
465	bool "SBI v0.1 support"
466	depends on RISCV_SBI
467	help
468	  This config allows kernel to use SBI v0.1 APIs. This will be
469	  deprecated in future once legacy M-mode software are no longer in use.
470
471config RISCV_BOOT_SPINWAIT
472	bool "Spinwait booting method"
473	depends on SMP
474	default y if RISCV_SBI_V01 || RISCV_M_MODE
475	help
476	  This enables support for booting Linux via spinwait method. In the
477	  spinwait method, all cores randomly jump to Linux. One of the cores
478	  gets chosen via lottery and all other keep spinning on a percpu
479	  variable. This method cannot support CPU hotplug and sparse hartid
480	  scheme. It should be only enabled for M-mode Linux or platforms relying
481	  on older firmware without SBI HSM extension. All other platforms should
482	  rely on ordered booting via SBI HSM extension which gets chosen
483	  dynamically at runtime if the firmware supports it.
484
485	  Since spinwait is incompatible with sparse hart IDs, it requires
486	  NR_CPUS be large enough to contain the physical hart ID of the first
487	  hart to enter Linux.
488
489	  If unsure what to do here, say N.
490
491config KEXEC
492	bool "Kexec system call"
493	select KEXEC_CORE
494	select HOTPLUG_CPU if SMP
495	depends on MMU
496	help
497	  kexec is a system call that implements the ability to shutdown your
498	  current kernel, and to start another kernel. It is like a reboot
499	  but it is independent of the system firmware. And like a reboot
500	  you can start any kernel with it, not just Linux.
501
502	  The name comes from the similarity to the exec system call.
503
504config KEXEC_FILE
505	bool "kexec file based systmem call"
506	select KEXEC_CORE
507	select KEXEC_ELF
508	select HAVE_IMA_KEXEC if IMA
509	depends on 64BIT && MMU
510	help
511	  This is new version of kexec system call. This system call is
512	  file based and takes file descriptors as system call argument
513	  for kernel and initramfs as opposed to list of segments as
514	  accepted by previous system call.
515
516	  If you don't know what to do here, say Y.
517
518config ARCH_HAS_KEXEC_PURGATORY
519	def_bool KEXEC_FILE
520	depends on CRYPTO=y
521	depends on CRYPTO_SHA256=y
522
523config CRASH_DUMP
524	bool "Build kdump crash kernel"
525	help
526	  Generate crash dump after being started by kexec. This should
527	  be normally only set in special crash dump kernels which are
528	  loaded in the main kernel with kexec-tools into a specially
529	  reserved region and then later executed after a crash by
530	  kdump/kexec.
531
532	  For more details see Documentation/admin-guide/kdump/kdump.rst
533
534config COMPAT
535	bool "Kernel support for 32-bit U-mode"
536	default 64BIT
537	depends on 64BIT && MMU
538	help
539	  This option enables support for a 32-bit U-mode running under a 64-bit
540	  kernel at S-mode. riscv32-specific components such as system calls,
541	  the user helper functions (vdso), signal rt_frame functions and the
542	  ptrace interface are handled appropriately by the kernel.
543
544	  If you want to execute 32-bit userspace applications, say Y.
545
546endmenu # "Kernel features"
547
548menu "Boot options"
549
550config CMDLINE
551	string "Built-in kernel command line"
552	help
553	  For most platforms, the arguments for the kernel's command line
554	  are provided at run-time, during boot. However, there are cases
555	  where either no arguments are being provided or the provided
556	  arguments are insufficient or even invalid.
557
558	  When that occurs, it is possible to define a built-in command
559	  line here and choose how the kernel should use it later on.
560
561choice
562	prompt "Built-in command line usage" if CMDLINE != ""
563	default CMDLINE_FALLBACK
564	help
565	  Choose how the kernel will handle the provided built-in command
566	  line.
567
568config CMDLINE_FALLBACK
569	bool "Use bootloader kernel arguments if available"
570	help
571	  Use the built-in command line as fallback in case we get nothing
572	  during boot. This is the default behaviour.
573
574config CMDLINE_EXTEND
575	bool "Extend bootloader kernel arguments"
576	help
577	  The command-line arguments provided during boot will be
578	  appended to the built-in command line. This is useful in
579	  cases where the provided arguments are insufficient and
580	  you don't want to or cannot modify them.
581
582config CMDLINE_FORCE
583	bool "Always use the default kernel command string"
584	help
585	  Always use the built-in command line, even if we get one during
586	  boot. This is useful in case you need to override the provided
587	  command line on systems where you don't have or want control
588	  over it.
589
590endchoice
591
592config EFI_STUB
593	bool
594
595config EFI
596	bool "UEFI runtime support"
597	depends on OF && !XIP_KERNEL
598	select LIBFDT
599	select UCS2_STRING
600	select EFI_PARAMS_FROM_FDT
601	select EFI_STUB
602	select EFI_GENERIC_STUB
603	select EFI_RUNTIME_WRAPPERS
604	select RISCV_ISA_C
605	depends on MMU
606	default y
607	help
608	  This option provides support for runtime services provided
609	  by UEFI firmware (such as non-volatile variables, realtime
610	  clock, and platform reset). A UEFI stub is also provided to
611	  allow the kernel to be booted as an EFI application. This
612	  is only useful on systems that have UEFI firmware.
613
614config CC_HAVE_STACKPROTECTOR_TLS
615	def_bool $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=tp -mstack-protector-guard-offset=0)
616
617config STACKPROTECTOR_PER_TASK
618	def_bool y
619	depends on !RANDSTRUCT
620	depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS
621
622config PHYS_RAM_BASE_FIXED
623	bool "Explicitly specified physical RAM address"
624	depends on NONPORTABLE
625	default n
626
627config PHYS_RAM_BASE
628	hex "Platform Physical RAM address"
629	depends on PHYS_RAM_BASE_FIXED
630	default "0x80000000"
631	help
632	  This is the physical address of RAM in the system. It has to be
633	  explicitly specified to run early relocations of read-write data
634	  from flash to RAM.
635
636config XIP_KERNEL
637	bool "Kernel Execute-In-Place from ROM"
638	depends on MMU && SPARSEMEM && NONPORTABLE
639	# This prevents XIP from being enabled by all{yes,mod}config, which
640	# fail to build since XIP doesn't support large kernels.
641	depends on !COMPILE_TEST
642	select PHYS_RAM_BASE_FIXED
643	help
644	  Execute-In-Place allows the kernel to run from non-volatile storage
645	  directly addressable by the CPU, such as NOR flash. This saves RAM
646	  space since the text section of the kernel is not loaded from flash
647	  to RAM.  Read-write sections, such as the data section and stack,
648	  are still copied to RAM.  The XIP kernel is not compressed since
649	  it has to run directly from flash, so it will take more space to
650	  store it.  The flash address used to link the kernel object files,
651	  and for storing it, is configuration dependent. Therefore, if you
652	  say Y here, you must know the proper physical address where to
653	  store the kernel image depending on your own flash memory usage.
654
655	  Also note that the make target becomes "make xipImage" rather than
656	  "make zImage" or "make Image".  The final kernel binary to put in
657	  ROM memory will be arch/riscv/boot/xipImage.
658
659	  SPARSEMEM is required because the kernel text and rodata that are
660	  flash resident are not backed by memmap, then any attempt to get
661	  a struct page on those regions will trigger a fault.
662
663	  If unsure, say N.
664
665config XIP_PHYS_ADDR
666	hex "XIP Kernel Physical Location"
667	depends on XIP_KERNEL
668	default "0x21000000"
669	help
670	  This is the physical address in your flash memory the kernel will
671	  be linked for and stored to.  This address is dependent on your
672	  own flash usage.
673
674endmenu # "Boot options"
675
676config BUILTIN_DTB
677	bool
678	depends on OF && NONPORTABLE
679	default y if XIP_KERNEL
680
681config PORTABLE
682	bool
683	default !NONPORTABLE
684	select EFI
685	select OF
686	select MMU
687
688menu "Power management options"
689
690source "kernel/power/Kconfig"
691
692endmenu # "Power management options"
693
694menu "CPU Power Management"
695
696source "drivers/cpuidle/Kconfig"
697
698source "drivers/cpufreq/Kconfig"
699
700endmenu # "CPU Power Management"
701
702source "arch/riscv/kvm/Kconfig"
703