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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc 
 kernel/arch/riscv/Kconfig
....@@ -1,6 +1,7 @@
1
+# SPDX-License-Identifier: GPL-2.0-only
12 #
23 # For a description of the syntax of this configuration file,
3
-# see Documentation/kbuild/kconfig-language.txt.
4
+# see Documentation/kbuild/kconfig-language.rst.
45 #
56 
67 config 64BIT
....@@ -11,60 +12,165 @@
1112 
1213 config RISCV
1314 	def_bool y
14
-	# even on 32-bit, physical (and DMA) addresses are > 32-bits
15
-	select PHYS_ADDR_T_64BIT
15
+	select ARCH_CLOCKSOURCE_INIT
16
+	select ARCH_SUPPORTS_ATOMIC_RMW
17
+	select ARCH_HAS_BINFMT_FLAT
18
+	select ARCH_HAS_DEBUG_VM_PGTABLE
19
+	select ARCH_HAS_DEBUG_VIRTUAL if MMU
20
+	select ARCH_HAS_DEBUG_WX
21
+	select ARCH_HAS_GCOV_PROFILE_ALL
22
+	select ARCH_HAS_GIGANTIC_PAGE
23
+	select ARCH_HAS_KCOV
24
+	select ARCH_HAS_MMIOWB
25
+	select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
26
+	select ARCH_HAS_PTE_SPECIAL
27
+	select ARCH_HAS_SET_DIRECT_MAP
28
+	select ARCH_HAS_SET_MEMORY
29
+	select ARCH_HAS_STRICT_KERNEL_RWX if MMU
30
+	select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
31
+	select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
32
+	select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
33
+	select ARCH_WANT_FRAME_POINTERS
34
+	select ARCH_WANT_HUGE_PMD_SHARE if 64BIT
35
+	select CLONE_BACKWARDS
36
+	select CLINT_TIMER if !MMU
37
+	select COMMON_CLK
38
+	select EDAC_SUPPORT
39
+	select GENERIC_ARCH_TOPOLOGY
40
+	select GENERIC_ATOMIC64 if !64BIT
41
+	select GENERIC_CLOCKEVENTS
42
+	select GENERIC_EARLY_IOREMAP
43
+	select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO
44
+	select GENERIC_IOREMAP
45
+	select GENERIC_IRQ_MULTI_HANDLER
46
+	select GENERIC_IRQ_SHOW
47
+	select GENERIC_PCI_IOMAP
48
+	select GENERIC_PTDUMP if MMU
49
+	select GENERIC_SCHED_CLOCK
50
+	select GENERIC_SMP_IDLE_THREAD
51
+	select GENERIC_STRNCPY_FROM_USER if MMU
52
+	select GENERIC_STRNLEN_USER if MMU
53
+	select GENERIC_TIME_VSYSCALL if MMU && 64BIT
54
+	select HANDLE_DOMAIN_IRQ
55
+	select HAVE_ARCH_AUDITSYSCALL
56
+	select HAVE_ARCH_JUMP_LABEL
57
+	select HAVE_ARCH_JUMP_LABEL_RELATIVE
58
+	select HAVE_ARCH_KASAN if MMU && 64BIT
59
+	select HAVE_ARCH_KGDB
60
+	select HAVE_ARCH_KGDB_QXFER_PKT
61
+	select HAVE_ARCH_MMAP_RND_BITS if MMU
62
+	select HAVE_ARCH_SECCOMP_FILTER
63
+	select HAVE_ARCH_TRACEHOOK
64
+	select HAVE_ASM_MODVERSIONS
65
+	select HAVE_CONTEXT_TRACKING
66
+	select HAVE_DEBUG_KMEMLEAK
67
+	select HAVE_DMA_CONTIGUOUS if MMU
68
+	select HAVE_EBPF_JIT if MMU
69
+	select HAVE_FUTEX_CMPXCHG if FUTEX
70
+	select HAVE_GCC_PLUGINS
71
+	select HAVE_GENERIC_VDSO if MMU && 64BIT
72
+	select HAVE_PCI
73
+	select HAVE_PERF_EVENTS
74
+	select HAVE_PERF_REGS
75
+	select HAVE_PERF_USER_STACK_DUMP
76
+	select HAVE_STACKPROTECTOR
77
+	select HAVE_SYSCALL_TRACEPOINTS
78
+	select IRQ_DOMAIN
79
+	select MODULES_USE_ELF_RELA if MODULES
80
+	select MODULE_SECTIONS if MODULES
1681 	select OF
1782 	select OF_EARLY_FLATTREE
1883 	select OF_IRQ
19
-	select ARCH_WANT_FRAME_POINTERS
20
-	select CLONE_BACKWARDS
21
-	select COMMON_CLK
22
-	select DMA_DIRECT_OPS
23
-	select GENERIC_CLOCKEVENTS
24
-	select GENERIC_CPU_DEVICES
25
-	select GENERIC_IRQ_SHOW
26
-	select GENERIC_PCI_IOMAP
27
-	select GENERIC_STRNCPY_FROM_USER
28
-	select GENERIC_STRNLEN_USER
29
-	select GENERIC_SMP_IDLE_THREAD
30
-	select GENERIC_ATOMIC64 if !64BIT || !RISCV_ISA_A
31
-	select HAVE_MEMBLOCK
32
-	select HAVE_MEMBLOCK_NODE_MAP
33
-	select HAVE_DMA_CONTIGUOUS
34
-	select HAVE_GENERIC_DMA_COHERENT
35
-	select HAVE_PERF_EVENTS
36
-	select IRQ_DOMAIN
37
-	select NO_BOOTMEM
38
-	select RISCV_ISA_A if SMP
84
+	select PCI_DOMAINS_GENERIC if PCI
85
+	select PCI_MSI if PCI
86
+	select RISCV_INTC
87
+	select RISCV_TIMER if RISCV_SBI
3988 	select SPARSE_IRQ
4089 	select SYSCTL_EXCEPTION_TRACE
41
-	select HAVE_ARCH_TRACEHOOK
42
-	select MODULES_USE_ELF_RELA if MODULES
4390 	select THREAD_INFO_IN_TASK
44
-	select RISCV_TIMER
45
-	select GENERIC_IRQ_MULTI_HANDLER
46
-	select ARCH_HAS_PTE_SPECIAL
91
+	select UACCESS_MEMCPY if !MMU
92
+
93
+config ARCH_MMAP_RND_BITS_MIN
94
+	default 18 if 64BIT
95
+	default 8
96
+
97
+# max bits determined by the following formula:
98
+#  VA_BITS - PAGE_SHIFT - 3
99
+config ARCH_MMAP_RND_BITS_MAX
100
+	default 24 if 64BIT # SV39 based
101
+	default 17
102
+
103
+# set if we run in machine mode, cleared if we run in supervisor mode
104
+config RISCV_M_MODE
105
+	bool
106
+	default !MMU
107
+
108
+# set if we are running in S-mode and can use SBI calls
109
+config RISCV_SBI
110
+	bool
111
+	depends on !RISCV_M_MODE
112
+	default y
47113 
48114 config MMU
49
-	def_bool y
115
+	bool "MMU-based Paged Memory Management Support"
116
+	default y
117
+	help
118
+	  Select if you want MMU-based virtualised addressing space
119
+	  support by paged memory management. If unsure, say 'Y'.
50120 
51121 config ZONE_DMA32
52122 	bool
53123 	default y if 64BIT
54124 
125
+config VA_BITS
126
+	int
127
+	default 32 if 32BIT
128
+	default 39 if 64BIT
129
+
130
+config PA_BITS
131
+	int
132
+	default 34 if 32BIT
133
+	default 56 if 64BIT
134
+
55135 config PAGE_OFFSET
56136 	hex
57
-	default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB
137
+	default 0xC0000000 if 32BIT && MAXPHYSMEM_1GB
138
+	default 0x80000000 if 64BIT && !MMU
58139 	default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB
59140 	default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB
141
+
142
+config KASAN_SHADOW_OFFSET
143
+	hex
144
+	depends on KASAN_GENERIC
145
+	default 0xdfffffc800000000 if 64BIT
146
+	default 0xffffffff if 32BIT
147
+
148
+config ARCH_FLATMEM_ENABLE
149
+	def_bool y
150
+
151
+config ARCH_SPARSEMEM_ENABLE
152
+	def_bool y
153
+	depends on MMU
154
+	select SPARSEMEM_STATIC if 32BIT && SPARSEMEM
155
+	select SPARSEMEM_VMEMMAP_ENABLE if 64BIT
156
+
157
+config ARCH_SELECT_MEMORY_MODEL
158
+	def_bool ARCH_SPARSEMEM_ENABLE
159
+
160
+config ARCH_WANT_GENERAL_HUGETLB
161
+	def_bool y
162
+
163
+config ARCH_SUPPORTS_DEBUG_PAGEALLOC
164
+	def_bool y
165
+
166
+config SYS_SUPPORTS_HUGETLBFS
167
+	depends on MMU
168
+	def_bool y
60169 
61170 config STACKTRACE_SUPPORT
62171 	def_bool y
63172 
64173 config TRACE_IRQFLAGS_SUPPORT
65
-	def_bool y
66
-
67
-config RWSEM_GENERIC_SPINLOCK
68174 	def_bool y
69175 
70176 config GENERIC_BUG
....@@ -84,13 +190,18 @@
84190 config GENERIC_HWEIGHT
85191 	def_bool y
86192 
193
+config FIX_EARLYCON_MEM
194
+	def_bool MMU
195
+
87196 config PGTABLE_LEVELS
88197 	int
89198 	default 3 if 64BIT
90199 	default 2
91200 
92
-config HAVE_KPROBES
93
-	def_bool n
201
+config LOCKDEP_SUPPORT
202
+	def_bool y
203
+
204
+source "arch/riscv/Kconfig.socs"
94205 
95206 menu "Platform type"
96207 
....@@ -98,7 +209,7 @@
98209 	prompt "Base ISA"
99210 	default ARCH_RV64I
100211 	help
101
-	  This selects the base ISA that this kernel will traget and must match
212
+	  This selects the base ISA that this kernel will target and must match
102213 	  the target platform.
103214 
104215 config ARCH_RV32I
....@@ -108,16 +219,18 @@
108219 	select GENERIC_LIB_ASHRDI3
109220 	select GENERIC_LIB_LSHRDI3
110221 	select GENERIC_LIB_UCMPDI2
222
+	select MMU
111223 
112224 config ARCH_RV64I
113225 	bool "RV64I"
114226 	select 64BIT
115
-	select HAVE_FUNCTION_TRACER
116
-	select HAVE_FUNCTION_GRAPH_TRACER
227
+	select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && GCC_VERSION >= 50000
228
+	select HAVE_DYNAMIC_FTRACE if MMU
229
+	select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE
117230 	select HAVE_FTRACE_MCOUNT_RECORD
118
-	select HAVE_DYNAMIC_FTRACE
119
-	select HAVE_DYNAMIC_FTRACE_WITH_REGS
120
-	select SWIOTLB
231
+	select HAVE_FUNCTION_GRAPH_TRACER
232
+	select HAVE_FUNCTION_TRACER
233
+	select SWIOTLB if MMU
121234 
122235 endchoice
123236 
....@@ -141,15 +254,18 @@
141254 
142255 choice
143256 	prompt "Maximum Physical Memory"
144
-	default MAXPHYSMEM_2GB if 32BIT
257
+	default MAXPHYSMEM_1GB if 32BIT
145258 	default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW
146259 	default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY
147260 
261
+	config MAXPHYSMEM_1GB
262
+		depends on 32BIT
263
+		bool "1GiB"
148264 	config MAXPHYSMEM_2GB
265
+		depends on 64BIT && CMODEL_MEDLOW
149266 		bool "2GiB"
150267 	config MAXPHYSMEM_128GB
151268 		depends on 64BIT && CMODEL_MEDANY
152
-		select MODULE_SECTIONS if MODULES
153269 		bool "128GiB"
154270 endchoice
155271 
....@@ -173,6 +289,17 @@
173289 	depends on SMP
174290 	default "8"
175291 
292
+config HOTPLUG_CPU
293
+	bool "Support for hot-pluggable CPUs"
294
+	depends on SMP
295
+	select GENERIC_IRQ_MIGRATION
296
+	help
297
+
298
+	  Say Y here to experiment with turning CPUs off and on.  CPUs
299
+	  can be controlled through /sys/devices/system/cpu.
300
+
301
+	  Say N if you want to disable CPU hotplug.
302
+
176303 choice
177304 	prompt "CPU Tuning"
178305 	default TUNE_GENERIC
....@@ -192,9 +319,6 @@
192319 
193320 	   If you don't know what to do here, say Y.
194321 
195
-config RISCV_ISA_A
196
-	def_bool y
197
-
198322 menu "supported PMU type"
199323 	depends on PERF_EVENTS
200324 
....@@ -208,38 +332,130 @@
208332 
209333 endmenu
210334 
211
-endmenu
212
-
213
-menu "Kernel type"
214
-
215
-source "kernel/Kconfig.hz"
216
-
217
-endmenu
218
-
219
-menu "Bus support"
220
-
221
-config PCI
222
-	bool "PCI support"
223
-	select PCI_MSI
335
+config TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI
336
+	def_bool y
337
+	# https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=aed44286efa8ae8717a77d94b51ac3614e2ca6dc
338
+	depends on AS_IS_GNU && AS_VERSION >= 23800
224339 	help
225
-	  This feature enables support for PCI bus system. If you say Y
226
-	  here, the kernel will include drivers and infrastructure code
227
-	  to support PCI bus devices.
340
+	  Newer binutils versions default to ISA spec version 20191213 which
341
+	  moves some instructions from the I extension to the Zicsr and Zifencei
342
+	  extensions.
343
+
344
+config TOOLCHAIN_NEEDS_OLD_ISA_SPEC
345
+	def_bool y
346
+	depends on TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI
347
+	# https://github.com/llvm/llvm-project/commit/22e199e6afb1263c943c0c0d4498694e15bf8a16
348
+	depends on CC_IS_CLANG && CLANG_VERSION < 170000
349
+	help
350
+	  Certain versions of clang do not support zicsr and zifencei via -march
351
+	  but newer versions of binutils require it for the reasons noted in the
352
+	  help text of CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI. This
353
+	  option causes an older ISA spec compatible with these older versions
354
+	  of clang to be passed to GAS, which has the same result as passing zicsr
355
+	  and zifencei to -march.
356
+
357
+config FPU
358
+	bool "FPU support"
359
+	default y
360
+	help
361
+	  Say N here if you want to disable all floating-point related procedure
362
+	  in the kernel.
228363 
229364 	  If you don't know what to do here, say Y.
230365 
231
-config PCI_DOMAINS
232
-	def_bool PCI
366
+endmenu
233367 
234
-config PCI_DOMAINS_GENERIC
235
-	def_bool PCI
368
+menu "Kernel features"
236369 
237
-source "drivers/pci/Kconfig"
370
+source "kernel/Kconfig.hz"
371
+
372
+config RISCV_SBI_V01
373
+	bool "SBI v0.1 support"
374
+	default y
375
+	depends on RISCV_SBI
376
+	help
377
+	  This config allows kernel to use SBI v0.1 APIs. This will be
378
+	  deprecated in future once legacy M-mode software are no longer in use.
379
+endmenu
380
+
381
+menu "Boot options"
382
+
383
+config CMDLINE
384
+	string "Built-in kernel command line"
385
+	help
386
+	  For most platforms, the arguments for the kernel's command line
387
+	  are provided at run-time, during boot. However, there are cases
388
+	  where either no arguments are being provided or the provided
389
+	  arguments are insufficient or even invalid.
390
+
391
+	  When that occurs, it is possible to define a built-in command
392
+	  line here and choose how the kernel should use it later on.
393
+
394
+choice
395
+	prompt "Built-in command line usage" if CMDLINE != ""
396
+	default CMDLINE_FALLBACK
397
+	help
398
+	  Choose how the kernel will handle the provided built-in command
399
+	  line.
400
+
401
+config CMDLINE_FALLBACK
402
+	bool "Use bootloader kernel arguments if available"
403
+	help
404
+	  Use the built-in command line as fallback in case we get nothing
405
+	  during boot. This is the default behaviour.
406
+
407
+config CMDLINE_EXTEND
408
+	bool "Extend bootloader kernel arguments"
409
+	help
410
+	  The command-line arguments provided during boot will be
411
+	  appended to the built-in command line. This is useful in
412
+	  cases where the provided arguments are insufficient and
413
+	  you don't want to or cannot modify them.
414
+
415
+
416
+config CMDLINE_FORCE
417
+	bool "Always use the default kernel command string"
418
+	help
419
+	  Always use the built-in command line, even if we get one during
420
+	  boot. This is useful in case you need to override the provided
421
+	  command line on systems where you don't have or want control
422
+	  over it.
423
+
424
+endchoice
425
+
426
+config EFI_STUB
427
+	bool
428
+
429
+config EFI
430
+	bool "UEFI runtime support"
431
+	depends on OF
432
+	select LIBFDT
433
+	select UCS2_STRING
434
+	select EFI_PARAMS_FROM_FDT
435
+	select EFI_STUB
436
+	select EFI_GENERIC_STUB
437
+	select EFI_RUNTIME_WRAPPERS
438
+	select RISCV_ISA_C
439
+	depends on MMU
440
+	default y
441
+	help
442
+	  This option provides support for runtime services provided
443
+	  by UEFI firmware (such as non-volatile variables, realtime
444
+	  clock, and platform reset). A UEFI stub is also provided to
445
+	  allow the kernel to be booted as an EFI application. This
446
+	  is only useful on systems that have UEFI firmware.
238447 
239448 endmenu
449
+
450
+config BUILTIN_DTB
451
+	def_bool n
452
+	depends on RISCV_M_MODE
453
+	depends on OF
240454 
241455 menu "Power management options"
242456 
243
-source kernel/power/Kconfig
457
+source "kernel/power/Kconfig"
244458 
245459 endmenu
460
+
461
+source "drivers/firmware/Kconfig"