xref: /openbmc/linux/arch/riscv/Kconfig (revision c2dea0bc53397166a77811d9b66928643a83d6f3)
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_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE
18	select ARCH_HAS_BINFMT_FLAT
19	select ARCH_HAS_CURRENT_STACK_POINTER
20	select ARCH_HAS_DEBUG_VIRTUAL if MMU
21	select ARCH_HAS_DEBUG_VM_PGTABLE
22	select ARCH_HAS_DEBUG_WX
23	select ARCH_HAS_FORTIFY_SOURCE
24	select ARCH_HAS_GCOV_PROFILE_ALL
25	select ARCH_HAS_GIGANTIC_PAGE
26	select ARCH_HAS_KCOV
27	select ARCH_HAS_MMIOWB
28	select ARCH_HAS_PMEM_API
29	select ARCH_HAS_PTE_SPECIAL
30	select ARCH_HAS_SET_DIRECT_MAP if MMU
31	select ARCH_HAS_SET_MEMORY if MMU
32	select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL
33	select ARCH_HAS_STRICT_MODULE_RWX if MMU && !XIP_KERNEL
34	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
35	select ARCH_HAS_UBSAN_SANITIZE_ALL
36	select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
37	select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
38	select ARCH_STACKWALK
39	select ARCH_SUPPORTS_ATOMIC_RMW
40	select ARCH_SUPPORTS_DEBUG_PAGEALLOC if MMU
41	select ARCH_SUPPORTS_HUGETLBFS if MMU
42	select ARCH_SUPPORTS_PAGE_TABLE_CHECK if MMU
43	select ARCH_USE_MEMTEST
44	select ARCH_USE_QUEUED_RWLOCKS
45	select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
46	select ARCH_WANT_FRAME_POINTERS
47	select ARCH_WANT_GENERAL_HUGETLB
48	select ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
49	select ARCH_WANT_HUGE_PMD_SHARE if 64BIT
50	select ARCH_WANT_LD_ORPHAN_WARN if !XIP_KERNEL
51	select ARCH_WANTS_THP_SWAP if HAVE_ARCH_TRANSPARENT_HUGEPAGE
52	select BINFMT_FLAT_NO_DATA_START_OFFSET if !MMU
53	select BUILDTIME_TABLE_SORT if MMU
54	select CLINT_TIMER if !MMU
55	select CLONE_BACKWARDS
56	select COMMON_CLK
57	select CPU_PM if CPU_IDLE
58	select EDAC_SUPPORT
59	select GENERIC_ARCH_TOPOLOGY
60	select GENERIC_ATOMIC64 if !64BIT
61	select GENERIC_CLOCKEVENTS_BROADCAST if SMP
62	select GENERIC_EARLY_IOREMAP
63	select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO
64	select GENERIC_IDLE_POLL_SETUP
65	select GENERIC_IOREMAP if MMU
66	select GENERIC_IRQ_MULTI_HANDLER
67	select GENERIC_IRQ_SHOW
68	select GENERIC_IRQ_SHOW_LEVEL
69	select GENERIC_LIB_DEVMEM_IS_ALLOWED
70	select GENERIC_PCI_IOMAP
71	select GENERIC_PTDUMP if MMU
72	select GENERIC_SCHED_CLOCK
73	select GENERIC_SMP_IDLE_THREAD
74	select GENERIC_TIME_VSYSCALL if MMU && 64BIT
75	select GENERIC_VDSO_TIME_NS if HAVE_GENERIC_VDSO
76	select HARDIRQS_SW_RESEND
77	select HAVE_ARCH_AUDITSYSCALL
78	select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP
79	select HAVE_ARCH_HUGE_VMAP if MMU && 64BIT && !XIP_KERNEL
80	select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
81	select HAVE_ARCH_JUMP_LABEL_RELATIVE if !XIP_KERNEL
82	select HAVE_ARCH_KASAN if MMU && 64BIT
83	select HAVE_ARCH_KASAN_VMALLOC if MMU && 64BIT
84	select HAVE_ARCH_KFENCE if MMU && 64BIT
85	select HAVE_ARCH_KGDB if !XIP_KERNEL
86	select HAVE_ARCH_KGDB_QXFER_PKT
87	select HAVE_ARCH_MMAP_RND_BITS if MMU
88	select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
89	select HAVE_ARCH_SECCOMP_FILTER
90	select HAVE_ARCH_THREAD_STRUCT_WHITELIST
91	select HAVE_ARCH_TRACEHOOK
92	select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT && MMU
93	select HAVE_ARCH_VMAP_STACK if MMU && 64BIT
94	select HAVE_ASM_MODVERSIONS
95	select HAVE_CONTEXT_TRACKING_USER
96	select HAVE_DEBUG_KMEMLEAK
97	select HAVE_DMA_CONTIGUOUS if MMU
98	select HAVE_EBPF_JIT if MMU
99	select HAVE_FUNCTION_ARG_ACCESS_API
100	select HAVE_FUNCTION_ERROR_INJECTION
101	select HAVE_GCC_PLUGINS
102	select HAVE_GENERIC_VDSO if MMU && 64BIT
103	select HAVE_IRQ_TIME_ACCOUNTING
104	select HAVE_KPROBES if !XIP_KERNEL
105	select HAVE_KPROBES_ON_FTRACE if !XIP_KERNEL
106	select HAVE_KRETPROBES if !XIP_KERNEL
107	select HAVE_RETHOOK if !XIP_KERNEL
108	select HAVE_MOVE_PMD
109	select HAVE_MOVE_PUD
110	select HAVE_PCI
111	select HAVE_PERF_EVENTS
112	select HAVE_PERF_REGS
113	select HAVE_PERF_USER_STACK_DUMP
114	select HAVE_POSIX_CPU_TIMERS_TASK_WORK
115	select HAVE_REGS_AND_STACK_ACCESS_API
116	select HAVE_RSEQ
117	select HAVE_STACKPROTECTOR
118	select HAVE_SYSCALL_TRACEPOINTS
119	select IRQ_DOMAIN
120	select IRQ_FORCED_THREADING
121	select MODULES_USE_ELF_RELA if MODULES
122	select MODULE_SECTIONS if MODULES
123	select OF
124	select OF_DMA_DEFAULT_COHERENT
125	select OF_EARLY_FLATTREE
126	select OF_IRQ
127	select PCI_DOMAINS_GENERIC if PCI
128	select PCI_MSI if PCI
129	select RISCV_INTC
130	select RISCV_TIMER if RISCV_SBI
131	select SIFIVE_PLIC
132	select SPARSE_IRQ
133	select SYSCTL_EXCEPTION_TRACE
134	select THREAD_INFO_IN_TASK
135	select TRACE_IRQFLAGS_SUPPORT
136	select UACCESS_MEMCPY if !MMU
137	select ZONE_DMA32 if 64BIT
138	select HAVE_DYNAMIC_FTRACE if !XIP_KERNEL && MMU && $(cc-option,-fpatchable-function-entry=8)
139	select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE
140	select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL
141	select HAVE_FUNCTION_GRAPH_TRACER
142	select HAVE_FUNCTION_TRACER if !XIP_KERNEL && !PREEMPTION
143
144config ARCH_MMAP_RND_BITS_MIN
145	default 18 if 64BIT
146	default 8
147
148config ARCH_MMAP_RND_COMPAT_BITS_MIN
149	default 8
150
151# max bits determined by the following formula:
152#  VA_BITS - PAGE_SHIFT - 3
153config ARCH_MMAP_RND_BITS_MAX
154	default 24 if 64BIT # SV39 based
155	default 17
156
157config ARCH_MMAP_RND_COMPAT_BITS_MAX
158	default 17
159
160# set if we run in machine mode, cleared if we run in supervisor mode
161config RISCV_M_MODE
162	bool
163	default !MMU
164
165# set if we are running in S-mode and can use SBI calls
166config RISCV_SBI
167	bool
168	depends on !RISCV_M_MODE
169	default y
170
171config MMU
172	bool "MMU-based Paged Memory Management Support"
173	default y
174	help
175	  Select if you want MMU-based virtualised addressing space
176	  support by paged memory management. If unsure, say 'Y'.
177
178config PAGE_OFFSET
179	hex
180	default 0xC0000000 if 32BIT
181	default 0x80000000 if 64BIT && !MMU
182	default 0xff60000000000000 if 64BIT
183
184config KASAN_SHADOW_OFFSET
185	hex
186	depends on KASAN_GENERIC
187	default 0xdfffffff00000000 if 64BIT
188	default 0xffffffff if 32BIT
189
190config ARCH_FLATMEM_ENABLE
191	def_bool !NUMA
192
193config ARCH_SPARSEMEM_ENABLE
194	def_bool y
195	depends on MMU
196	select SPARSEMEM_STATIC if 32BIT && SPARSEMEM
197	select SPARSEMEM_VMEMMAP_ENABLE if 64BIT
198
199config ARCH_SELECT_MEMORY_MODEL
200	def_bool ARCH_SPARSEMEM_ENABLE
201
202config ARCH_SUPPORTS_UPROBES
203	def_bool y
204
205config STACKTRACE_SUPPORT
206	def_bool y
207
208config GENERIC_BUG
209	def_bool y
210	depends on BUG
211	select GENERIC_BUG_RELATIVE_POINTERS if 64BIT
212
213config GENERIC_BUG_RELATIVE_POINTERS
214	bool
215
216config GENERIC_CALIBRATE_DELAY
217	def_bool y
218
219config GENERIC_CSUM
220	def_bool y
221
222config GENERIC_HWEIGHT
223	def_bool y
224
225config FIX_EARLYCON_MEM
226	def_bool MMU
227
228config PGTABLE_LEVELS
229	int
230	default 5 if 64BIT
231	default 2
232
233config LOCKDEP_SUPPORT
234	def_bool y
235
236config RISCV_DMA_NONCOHERENT
237	bool
238	select ARCH_HAS_DMA_PREP_COHERENT
239	select ARCH_HAS_SETUP_DMA_OPS
240	select ARCH_HAS_SYNC_DMA_FOR_CPU
241	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
242	select DMA_DIRECT_REMAP
243
244config AS_HAS_INSN
245	def_bool $(as-instr,.insn r 51$(comma) 0$(comma) 0$(comma) t0$(comma) t0$(comma) zero)
246
247source "arch/riscv/Kconfig.socs"
248source "arch/riscv/Kconfig.erratas"
249
250menu "Platform type"
251
252config NONPORTABLE
253	bool "Allow configurations that result in non-portable kernels"
254	help
255	  RISC-V kernel binaries are compatible between all known systems
256	  whenever possible, but there are some use cases that can only be
257	  satisfied by configurations that result in kernel binaries that are
258	  not portable between systems.
259
260	  Selecting N does not guarantee kernels will be portable to all known
261	  systems.  Selecting any of the options guarded by NONPORTABLE will
262	  result in kernel binaries that are unlikely to be portable between
263	  systems.
264
265	  If unsure, say N.
266
267choice
268	prompt "Base ISA"
269	default ARCH_RV64I
270	help
271	  This selects the base ISA that this kernel will target and must match
272	  the target platform.
273
274config ARCH_RV32I
275	bool "RV32I"
276	depends on NONPORTABLE
277	select 32BIT
278	select GENERIC_LIB_ASHLDI3
279	select GENERIC_LIB_ASHRDI3
280	select GENERIC_LIB_LSHRDI3
281	select GENERIC_LIB_UCMPDI2
282	select MMU
283
284config ARCH_RV64I
285	bool "RV64I"
286	select 64BIT
287	select ARCH_SUPPORTS_INT128 if CC_HAS_INT128
288	select SWIOTLB if MMU
289
290endchoice
291
292# We must be able to map all physical memory into the kernel, but the compiler
293# is still a bit more efficient when generating code if it's setup in a manner
294# such that it can only map 2GiB of memory.
295choice
296	prompt "Kernel Code Model"
297	default CMODEL_MEDLOW if 32BIT
298	default CMODEL_MEDANY if 64BIT
299
300	config CMODEL_MEDLOW
301		bool "medium low code model"
302	config CMODEL_MEDANY
303		bool "medium any code model"
304endchoice
305
306config MODULE_SECTIONS
307	bool
308	select HAVE_MOD_ARCH_SPECIFIC
309
310config SMP
311	bool "Symmetric Multi-Processing"
312	help
313	  This enables support for systems with more than one CPU.  If
314	  you say N here, the kernel will run on single and
315	  multiprocessor machines, but will use only one CPU of a
316	  multiprocessor machine. If you say Y here, the kernel will run
317	  on many, but not all, single processor machines. On a single
318	  processor machine, the kernel will run faster if you say N
319	  here.
320
321	  If you don't know what to do here, say N.
322
323config NR_CPUS
324	int "Maximum number of CPUs (2-512)"
325	depends on SMP
326	range 2 512 if !RISCV_SBI_V01
327	range 2 32 if RISCV_SBI_V01 && 32BIT
328	range 2 64 if RISCV_SBI_V01 && 64BIT
329	default "32" if 32BIT
330	default "64" if 64BIT
331
332config HOTPLUG_CPU
333	bool "Support for hot-pluggable CPUs"
334	depends on SMP
335	select GENERIC_IRQ_MIGRATION
336	help
337
338	  Say Y here to experiment with turning CPUs off and on.  CPUs
339	  can be controlled through /sys/devices/system/cpu.
340
341	  Say N if you want to disable CPU hotplug.
342
343choice
344	prompt "CPU Tuning"
345	default TUNE_GENERIC
346
347config TUNE_GENERIC
348	bool "generic"
349
350endchoice
351
352# Common NUMA Features
353config NUMA
354	bool "NUMA Memory Allocation and Scheduler Support"
355	depends on SMP && MMU
356	select ARCH_SUPPORTS_NUMA_BALANCING
357	select GENERIC_ARCH_NUMA
358	select NEED_PER_CPU_EMBED_FIRST_CHUNK
359	select OF_NUMA
360	select USE_PERCPU_NUMA_NODE_ID
361	help
362	  Enable NUMA (Non-Uniform Memory Access) support.
363
364	  The kernel will try to allocate memory used by a CPU on the
365	  local memory of the CPU and add some more NUMA awareness to the kernel.
366
367config NODES_SHIFT
368	int "Maximum NUMA Nodes (as a power of 2)"
369	range 1 10
370	default "2"
371	depends on NUMA
372	help
373	  Specify the maximum number of NUMA Nodes available on the target
374	  system.  Increases memory reserved to accommodate various tables.
375
376config RISCV_ALTERNATIVE
377	bool
378	depends on !XIP_KERNEL
379	help
380	  This Kconfig allows the kernel to automatically patch the
381	  errata required by the execution platform at run time. The
382	  code patching is performed once in the boot stages. It means
383	  that the overhead from this mechanism is just taken once.
384
385config RISCV_ALTERNATIVE_EARLY
386	bool
387	depends on RISCV_ALTERNATIVE
388	help
389	  Allows early patching of the kernel for special errata
390
391config RISCV_ISA_C
392	bool "Emit compressed instructions when building Linux"
393	default y
394	help
395	  Adds "C" to the ISA subsets that the toolchain is allowed to emit
396	  when building Linux, which results in compressed instructions in the
397	  Linux binary.
398
399	  If you don't know what to do here, say Y.
400
401config RISCV_ISA_SVPBMT
402	bool "SVPBMT extension support"
403	depends on 64BIT && MMU
404	depends on !XIP_KERNEL
405	default y
406	select RISCV_ALTERNATIVE
407	help
408	   Adds support to dynamically detect the presence of the SVPBMT
409	   ISA-extension (Supervisor-mode: page-based memory types) and
410	   enable its usage.
411
412	   The memory type for a page contains a combination of attributes
413	   that indicate the cacheability, idempotency, and ordering
414	   properties for access to that page.
415
416	   The SVPBMT extension is only available on 64Bit cpus.
417
418	   If you don't know what to do here, say Y.
419
420config TOOLCHAIN_HAS_ZBB
421	bool
422	default y
423	depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zbb)
424	depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zbb)
425	depends on LLD_VERSION >= 150000 || LD_VERSION >= 23900
426	depends on AS_IS_GNU
427
428config RISCV_ISA_ZBB
429	bool "Zbb extension support for bit manipulation instructions"
430	depends on TOOLCHAIN_HAS_ZBB
431	depends on !XIP_KERNEL && MMU
432	select RISCV_ALTERNATIVE
433	default y
434	help
435	   Adds support to dynamically detect the presence of the ZBB
436	   extension (basic bit manipulation) and enable its usage.
437
438	   The Zbb extension provides instructions to accelerate a number
439	   of bit-specific operations (count bit population, sign extending,
440	   bitrotation, etc).
441
442	   If you don't know what to do here, say Y.
443
444config RISCV_ISA_ZICBOM
445	bool "Zicbom extension support for non-coherent DMA operation"
446	depends on !XIP_KERNEL && MMU
447	default y
448	select RISCV_ALTERNATIVE
449	select RISCV_DMA_NONCOHERENT
450	help
451	   Adds support to dynamically detect the presence of the ZICBOM
452	   extension (Cache Block Management Operations) and enable its
453	   usage.
454
455	   The Zicbom extension can be used to handle for example
456	   non-coherent DMA support on devices that need it.
457
458	   If you don't know what to do here, say Y.
459
460config TOOLCHAIN_HAS_ZIHINTPAUSE
461	bool
462	default y
463	depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zihintpause)
464	depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zihintpause)
465	depends on LLD_VERSION >= 150000 || LD_VERSION >= 23600
466
467config FPU
468	bool "FPU support"
469	default y
470	help
471	  Say N here if you want to disable all floating-point related procedure
472	  in the kernel.
473
474	  If you don't know what to do here, say Y.
475
476endmenu # "Platform type"
477
478menu "Kernel features"
479
480source "kernel/Kconfig.hz"
481
482config RISCV_SBI_V01
483	bool "SBI v0.1 support"
484	depends on RISCV_SBI
485	help
486	  This config allows kernel to use SBI v0.1 APIs. This will be
487	  deprecated in future once legacy M-mode software are no longer in use.
488
489config RISCV_BOOT_SPINWAIT
490	bool "Spinwait booting method"
491	depends on SMP
492	default y if RISCV_SBI_V01 || RISCV_M_MODE
493	help
494	  This enables support for booting Linux via spinwait method. In the
495	  spinwait method, all cores randomly jump to Linux. One of the cores
496	  gets chosen via lottery and all other keep spinning on a percpu
497	  variable. This method cannot support CPU hotplug and sparse hartid
498	  scheme. It should be only enabled for M-mode Linux or platforms relying
499	  on older firmware without SBI HSM extension. All other platforms should
500	  rely on ordered booting via SBI HSM extension which gets chosen
501	  dynamically at runtime if the firmware supports it.
502
503	  Since spinwait is incompatible with sparse hart IDs, it requires
504	  NR_CPUS be large enough to contain the physical hart ID of the first
505	  hart to enter Linux.
506
507	  If unsure what to do here, say N.
508
509config KEXEC
510	bool "Kexec system call"
511	depends on MMU
512	select HOTPLUG_CPU if SMP
513	select KEXEC_CORE
514	help
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.
519
520	  The name comes from the similarity to the exec system call.
521
522config KEXEC_FILE
523	bool "kexec file based systmem call"
524	depends on 64BIT && MMU
525	select HAVE_IMA_KEXEC if IMA
526	select KEXEC_CORE
527	select KEXEC_ELF
528	help
529	  This is new version of kexec system call. This system call is
530	  file based and takes file descriptors as system call argument
531	  for kernel and initramfs as opposed to list of segments as
532	  accepted by previous system call.
533
534	  If you don't know what to do here, say Y.
535
536config ARCH_HAS_KEXEC_PURGATORY
537	def_bool KEXEC_FILE
538	depends on CRYPTO=y
539	depends on CRYPTO_SHA256=y
540
541config CRASH_DUMP
542	bool "Build kdump crash kernel"
543	help
544	  Generate crash dump after being started by kexec. This should
545	  be normally only set in special crash dump kernels which are
546	  loaded in the main kernel with kexec-tools into a specially
547	  reserved region and then later executed after a crash by
548	  kdump/kexec.
549
550	  For more details see Documentation/admin-guide/kdump/kdump.rst
551
552config COMPAT
553	bool "Kernel support for 32-bit U-mode"
554	default 64BIT
555	depends on 64BIT && MMU
556	help
557	  This option enables support for a 32-bit U-mode running under a 64-bit
558	  kernel at S-mode. riscv32-specific components such as system calls,
559	  the user helper functions (vdso), signal rt_frame functions and the
560	  ptrace interface are handled appropriately by the kernel.
561
562	  If you want to execute 32-bit userspace applications, say Y.
563
564config RELOCATABLE
565	bool "Build a relocatable kernel"
566	depends on MMU && 64BIT && !XIP_KERNEL
567	help
568          This builds a kernel as a Position Independent Executable (PIE),
569          which retains all relocation metadata required to relocate the
570          kernel binary at runtime to a different virtual address than the
571          address it was linked at.
572          Since RISCV uses the RELA relocation format, this requires a
573          relocation pass at runtime even if the kernel is loaded at the
574          same address it was linked at.
575
576          If unsure, say N.
577
578endmenu # "Kernel features"
579
580menu "Boot options"
581
582config CMDLINE
583	string "Built-in kernel command line"
584	help
585	  For most platforms, the arguments for the kernel's command line
586	  are provided at run-time, during boot. However, there are cases
587	  where either no arguments are being provided or the provided
588	  arguments are insufficient or even invalid.
589
590	  When that occurs, it is possible to define a built-in command
591	  line here and choose how the kernel should use it later on.
592
593choice
594	prompt "Built-in command line usage" if CMDLINE != ""
595	default CMDLINE_FALLBACK
596	help
597	  Choose how the kernel will handle the provided built-in command
598	  line.
599
600config CMDLINE_FALLBACK
601	bool "Use bootloader kernel arguments if available"
602	help
603	  Use the built-in command line as fallback in case we get nothing
604	  during boot. This is the default behaviour.
605
606config CMDLINE_EXTEND
607	bool "Extend bootloader kernel arguments"
608	help
609	  The command-line arguments provided during boot will be
610	  appended to the built-in command line. This is useful in
611	  cases where the provided arguments are insufficient and
612	  you don't want to or cannot modify them.
613
614config CMDLINE_FORCE
615	bool "Always use the default kernel command string"
616	help
617	  Always use the built-in command line, even if we get one during
618	  boot. This is useful in case you need to override the provided
619	  command line on systems where you don't have or want control
620	  over it.
621
622endchoice
623
624config EFI_STUB
625	bool
626
627config EFI
628	bool "UEFI runtime support"
629	depends on OF && !XIP_KERNEL
630	depends on MMU
631	default y
632	select EFI_GENERIC_STUB
633	select EFI_PARAMS_FROM_FDT
634	select EFI_RUNTIME_WRAPPERS
635	select EFI_STUB
636	select LIBFDT
637	select RISCV_ISA_C
638	select UCS2_STRING
639	help
640	  This option provides support for runtime services provided
641	  by UEFI firmware (such as non-volatile variables, realtime
642	  clock, and platform reset). A UEFI stub is also provided to
643	  allow the kernel to be booted as an EFI application. This
644	  is only useful on systems that have UEFI firmware.
645
646config CC_HAVE_STACKPROTECTOR_TLS
647	def_bool $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=tp -mstack-protector-guard-offset=0)
648
649config STACKPROTECTOR_PER_TASK
650	def_bool y
651	depends on !RANDSTRUCT
652	depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS
653
654config PHYS_RAM_BASE_FIXED
655	bool "Explicitly specified physical RAM address"
656	depends on NONPORTABLE
657	default n
658
659config PHYS_RAM_BASE
660	hex "Platform Physical RAM address"
661	depends on PHYS_RAM_BASE_FIXED
662	default "0x80000000"
663	help
664	  This is the physical address of RAM in the system. It has to be
665	  explicitly specified to run early relocations of read-write data
666	  from flash to RAM.
667
668config XIP_KERNEL
669	bool "Kernel Execute-In-Place from ROM"
670	depends on MMU && SPARSEMEM && NONPORTABLE
671	# This prevents XIP from being enabled by all{yes,mod}config, which
672	# fail to build since XIP doesn't support large kernels.
673	depends on !COMPILE_TEST
674	select PHYS_RAM_BASE_FIXED
675	help
676	  Execute-In-Place allows the kernel to run from non-volatile storage
677	  directly addressable by the CPU, such as NOR flash. This saves RAM
678	  space since the text section of the kernel is not loaded from flash
679	  to RAM.  Read-write sections, such as the data section and stack,
680	  are still copied to RAM.  The XIP kernel is not compressed since
681	  it has to run directly from flash, so it will take more space to
682	  store it.  The flash address used to link the kernel object files,
683	  and for storing it, is configuration dependent. Therefore, if you
684	  say Y here, you must know the proper physical address where to
685	  store the kernel image depending on your own flash memory usage.
686
687	  Also note that the make target becomes "make xipImage" rather than
688	  "make zImage" or "make Image".  The final kernel binary to put in
689	  ROM memory will be arch/riscv/boot/xipImage.
690
691	  SPARSEMEM is required because the kernel text and rodata that are
692	  flash resident are not backed by memmap, then any attempt to get
693	  a struct page on those regions will trigger a fault.
694
695	  If unsure, say N.
696
697config XIP_PHYS_ADDR
698	hex "XIP Kernel Physical Location"
699	depends on XIP_KERNEL
700	default "0x21000000"
701	help
702	  This is the physical address in your flash memory the kernel will
703	  be linked for and stored to.  This address is dependent on your
704	  own flash usage.
705
706endmenu # "Boot options"
707
708config BUILTIN_DTB
709	bool
710	depends on OF && NONPORTABLE
711	default y if XIP_KERNEL
712
713config PORTABLE
714	bool
715	default !NONPORTABLE
716	select EFI
717	select MMU
718	select OF
719
720menu "Power management options"
721
722source "kernel/power/Kconfig"
723
724endmenu # "Power management options"
725
726menu "CPU Power Management"
727
728source "drivers/cpuidle/Kconfig"
729
730source "drivers/cpufreq/Kconfig"
731
732endmenu # "CPU Power Management"
733
734source "arch/riscv/kvm/Kconfig"
735