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7
8
9config ARC
10 def_bool y
11 select BUILDTIME_EXTABLE_SORT
12 select CLONE_BACKWARDS
13
14 select DEVTMPFS if !INITRAMFS_SOURCE=""
15 select GENERIC_ATOMIC64
16 select GENERIC_CLOCKEVENTS
17 select GENERIC_FIND_FIRST_BIT
18
19 select GENERIC_IRQ_SHOW
20 select GENERIC_PENDING_IRQ if SMP
21 select GENERIC_SMP_IDLE_THREAD
22 select HAVE_ARCH_KGDB
23 select HAVE_ARCH_TRACEHOOK
24 select HAVE_IOREMAP_PROT
25 select HAVE_KPROBES
26 select HAVE_KRETPROBES
27 select HAVE_MEMBLOCK
28 select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND
29 select HAVE_OPROFILE
30 select HAVE_PERF_EVENTS
31 select IRQ_DOMAIN
32 select MODULES_USE_ELF_RELA
33 select NO_BOOTMEM
34 select OF
35 select OF_EARLY_FLATTREE
36 select PERF_USE_VMALLOC
37 select HAVE_DEBUG_STACKOVERFLOW
38
39config TRACE_IRQFLAGS_SUPPORT
40 def_bool y
41
42config LOCKDEP_SUPPORT
43 def_bool y
44
45config SCHED_OMIT_FRAME_POINTER
46 def_bool y
47
48config GENERIC_CSUM
49 def_bool y
50
51config RWSEM_GENERIC_SPINLOCK
52 def_bool y
53
54config ARCH_FLATMEM_ENABLE
55 def_bool y
56
57config MMU
58 def_bool y
59
60config NO_IOPORT_MAP
61 def_bool y
62
63config GENERIC_CALIBRATE_DELAY
64 def_bool y
65
66config GENERIC_HWEIGHT
67 def_bool y
68
69config STACKTRACE_SUPPORT
70 def_bool y
71 select STACKTRACE
72
73config HAVE_LATENCYTOP_SUPPORT
74 def_bool y
75
76config NO_DMA
77 def_bool n
78
79source "init/Kconfig"
80source "kernel/Kconfig.freezer"
81
82menu "ARC Architecture Configuration"
83
84menu "ARC Platform/SoC/Board"
85
86source "arch/arc/plat-arcfpga/Kconfig"
87source "arch/arc/plat-tb10x/Kconfig"
88
89
90endmenu
91
92menu "ARC CPU Configuration"
93
94choice
95 prompt "ARC Core"
96 default ARC_CPU_770
97
98config ARC_CPU_750D
99 bool "ARC750D"
100 help
101 Support for ARC750 core
102
103config ARC_CPU_770
104 bool "ARC770"
105 select ARC_CPU_REL_4_10
106 help
107 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
108 This core has a bunch of cool new features:
109 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
110 Shared Address Spaces (for sharing TLB entires in MMU)
111 -Caches: New Prog Model, Region Flush
112 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
113
114endchoice
115
116config CPU_BIG_ENDIAN
117 bool "Enable Big Endian Mode"
118 default n
119 help
120 Build kernel for Big Endian Mode of ARC CPU
121
122
123config ARC_PLAT_NEEDS_CPU_TO_DMA
124 bool
125
126config SMP
127 bool "Symmetric Multi-Processing (Incomplete)"
128 default n
129 help
130 This enables support for systems with more than one CPU. If you have
131 a system with only one CPU, say N. If you have a system with more
132 than one CPU, say Y.
133
134if SMP
135
136config ARC_HAS_COH_CACHES
137 def_bool n
138
139config ARC_HAS_REENTRANT_IRQ_LV2
140 def_bool n
141
142endif
143
144config NR_CPUS
145 int "Maximum number of CPUs (2-4096)"
146 range 2 4096
147 depends on SMP
148 default "2"
149
150menuconfig ARC_CACHE
151 bool "Enable Cache Support"
152 default y
153
154 depends on !SMP || ARC_HAS_COH_CACHES
155
156if ARC_CACHE
157
158config ARC_CACHE_LINE_SHIFT
159 int "Cache Line Length (as power of 2)"
160 range 5 7
161 default "6"
162 help
163 Starting with ARC700 4.9, Cache line length is configurable,
164 This option specifies "N", with Line-len = 2 power N
165 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
166 Linux only supports same line lengths for I and D caches.
167
168config ARC_HAS_ICACHE
169 bool "Use Instruction Cache"
170 default y
171
172config ARC_HAS_DCACHE
173 bool "Use Data Cache"
174 default y
175
176config ARC_CACHE_PAGES
177 bool "Per Page Cache Control"
178 default y
179 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
180 help
181 This can be used to over-ride the global I/D Cache Enable on a
182 per-page basis (but only for pages accessed via MMU such as
183 Kernel Virtual address or User Virtual Address)
184 TLB entries have a per-page Cache Enable Bit.
185 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
186 Global DISABLE + Per Page ENABLE won't work
187
188config ARC_CACHE_VIPT_ALIASING
189 bool "Support VIPT Aliasing D$"
190 depends on ARC_HAS_DCACHE
191 default n
192
193endif
194
195config ARC_HAS_ICCM
196 bool "Use ICCM"
197 help
198 Single Cycle RAMS to store Fast Path Code
199 default n
200
201config ARC_ICCM_SZ
202 int "ICCM Size in KB"
203 default "64"
204 depends on ARC_HAS_ICCM
205
206config ARC_HAS_DCCM
207 bool "Use DCCM"
208 help
209 Single Cycle RAMS to store Fast Path Data
210 default n
211
212config ARC_DCCM_SZ
213 int "DCCM Size in KB"
214 default "64"
215 depends on ARC_HAS_DCCM
216
217config ARC_DCCM_BASE
218 hex "DCCM map address"
219 default "0xA0000000"
220 depends on ARC_HAS_DCCM
221
222config ARC_HAS_HW_MPY
223 bool "Use Hardware Multiplier (Normal or Faster XMAC)"
224 default y
225 help
226 Influences how gcc generates code for MPY operations.
227 If enabled, MPYxx insns are generated, provided by Standard/XMAC
228 Multipler. Otherwise software multipy lib is used
229
230choice
231 prompt "ARC700 MMU Version"
232 default ARC_MMU_V3 if ARC_CPU_770
233 default ARC_MMU_V2 if ARC_CPU_750D
234
235config ARC_MMU_V1
236 bool "MMU v1"
237 help
238 Orig ARC700 MMU
239
240config ARC_MMU_V2
241 bool "MMU v2"
242 help
243 Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
244 when 2 D-TLB and 1 I-TLB entries index into same 2way set.
245
246config ARC_MMU_V3
247 bool "MMU v3"
248 depends on ARC_CPU_770
249 help
250 Introduced with ARC700 4.10: New Features
251 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
252 Shared Address Spaces (SASID)
253
254endchoice
255
256
257choice
258 prompt "MMU Page Size"
259 default ARC_PAGE_SIZE_8K
260
261config ARC_PAGE_SIZE_8K
262 bool "8KB"
263 help
264 Choose between 8k vs 16k
265
266config ARC_PAGE_SIZE_16K
267 bool "16KB"
268 depends on ARC_MMU_V3
269
270config ARC_PAGE_SIZE_4K
271 bool "4KB"
272 depends on ARC_MMU_V3
273
274endchoice
275
276config ARC_COMPACT_IRQ_LEVELS
277 bool "ARCompact IRQ Priorities: High(2)/Low(1)"
278 default n
279
280 select ARC_IRQ3_LV2
281
282 depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
283
284if ARC_COMPACT_IRQ_LEVELS
285
286config ARC_IRQ3_LV2
287 bool
288
289config ARC_IRQ5_LV2
290 bool
291
292config ARC_IRQ6_LV2
293 bool
294
295endif
296
297config ARC_FPU_SAVE_RESTORE
298 bool "Enable FPU state persistence across context switch"
299 default n
300 help
301 Double Precision Floating Point unit had dedictaed regs which
302 need to be saved/restored across context-switch.
303 Note that ARC FPU is overly simplistic, unlike say x86, which has
304 hardware pieces to allow software to conditionally save/restore,
305 based on actual usage of FPU by a task. Thus our implemn does
306 this for all tasks in system.
307
308config ARC_CANT_LLSC
309 def_bool n
310
311menuconfig ARC_CPU_REL_4_10
312 bool "Enable support for Rel 4.10 features"
313 default n
314 help
315 -ARC770 (and dependent features) enabled
316 -ARC750 also shares some of the new features with 770
317
318config ARC_HAS_LLSC
319 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
320 default y
321 depends on ARC_CPU_770 && !ARC_CANT_LLSC
322
323config ARC_HAS_SWAPE
324 bool "Insn: SWAPE (endian-swap)"
325 default y
326 depends on ARC_CPU_REL_4_10
327
328config ARC_HAS_RTSC
329 bool "Insn: RTSC (64-bit r/o cycle counter)"
330 default y
331 depends on ARC_CPU_REL_4_10
332 depends on !SMP
333
334endmenu
335
336config LINUX_LINK_BASE
337 hex "Linux Link Address"
338 default "0x80000000"
339 help
340 ARC700 divides the 32 bit phy address space into two equal halves
341 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
342 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
343 Typically Linux kernel is linked at the start of untransalted addr,
344 hence the default value of 0x8zs.
345 However some customers have peripherals mapped at this addr, so
346 Linux needs to be scooted a bit.
347 If you don't know what the above means, leave this setting alone.
348
349config ARC_CURR_IN_REG
350 bool "Dedicate Register r25 for current_task pointer"
351 default y
352 help
353 This reserved Register R25 to point to Current Task in
354 kernel mode. This saves memory access for each such access
355
356
357config ARC_MISALIGN_ACCESS
358 bool "Emulate unaligned memory access (userspace only)"
359 select SYSCTL_ARCH_UNALIGN_NO_WARN
360 select SYSCTL_ARCH_UNALIGN_ALLOW
361 help
362 This enables misaligned 16 & 32 bit memory access from user space.
363 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
364 potential bugs in code
365
366config HZ
367 int "Timer Frequency"
368 default 100
369
370config ARC_METAWARE_HLINK
371 bool "Support for Metaware debugger assisted Host access"
372 default n
373 help
374 This options allows a Linux userland apps to directly access
375 host file system (open/creat/read/write etc) with help from
376 Metaware Debugger. This can come in handy for Linux-host communication
377 when there is no real usable peripheral such as EMAC.
378
379menuconfig ARC_DBG
380 bool "ARC debugging"
381 default y
382
383config ARC_DW2_UNWIND
384 bool "Enable DWARF specific kernel stack unwind"
385 depends on ARC_DBG
386 default y
387 select KALLSYMS
388 help
389 Compiles the kernel with DWARF unwind information and can be used
390 to get stack backtraces.
391
392 If you say Y here the resulting kernel image will be slightly larger
393 but not slower, and it will give very useful debugging information.
394 If you don't debug the kernel, you can say N, but we may not be able
395 to solve problems without frame unwind information
396
397config ARC_DBG_TLB_PARANOIA
398 bool "Paranoia Checks in Low Level TLB Handlers"
399 depends on ARC_DBG
400 default n
401
402config ARC_DBG_TLB_MISS_COUNT
403 bool "Profile TLB Misses"
404 default n
405 select DEBUG_FS
406 depends on ARC_DBG
407 help
408 Counts number of I and D TLB Misses and exports them via Debugfs
409 The counters can be cleared via Debugfs as well
410
411config ARC_BUILTIN_DTB_NAME
412 string "Built in DTB"
413 help
414 Set the name of the DTB to embed in the vmlinux binary
415 Leaving it blank selects the minimal "skeleton" dtb
416
417source "kernel/Kconfig.preempt"
418
419menu "Executable file formats"
420source "fs/Kconfig.binfmt"
421endmenu
422
423endmenu
424
425source "mm/Kconfig"
426source "net/Kconfig"
427source "drivers/Kconfig"
428source "fs/Kconfig"
429source "arch/arc/Kconfig.debug"
430source "security/Kconfig"
431source "crypto/Kconfig"
432source "lib/Kconfig"
433
