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Linux/arch/arc/Kconfig

  1 #
  2 # Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
  3 #
  4 # This program is free software; you can redistribute it and/or modify
  5 # it under the terms of the GNU General Public License version 2 as
  6 # published by the Free Software Foundation.
  7 #
  8 
  9 config ARC
 10         def_bool y
 11         select BUILDTIME_EXTABLE_SORT
 12         select COMMON_CLK
 13         select CLONE_BACKWARDS
 14         # ARC Busybox based initramfs absolutely relies on DEVTMPFS for /dev
 15         select DEVTMPFS if !INITRAMFS_SOURCE=""
 16         select GENERIC_ATOMIC64
 17         select GENERIC_CLOCKEVENTS
 18         select GENERIC_FIND_FIRST_BIT
 19         # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP
 20         select GENERIC_IRQ_SHOW
 21         select GENERIC_PENDING_IRQ if SMP
 22         select GENERIC_SMP_IDLE_THREAD
 23         select HAVE_ARCH_KGDB
 24         select HAVE_ARCH_TRACEHOOK
 25         select HAVE_IOREMAP_PROT
 26         select HAVE_KPROBES
 27         select HAVE_KRETPROBES
 28         select HAVE_MEMBLOCK
 29         select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND
 30         select HAVE_OPROFILE
 31         select HAVE_PERF_EVENTS
 32         select IRQ_DOMAIN
 33         select MODULES_USE_ELF_RELA
 34         select NO_BOOTMEM
 35         select OF
 36         select OF_EARLY_FLATTREE
 37         select PERF_USE_VMALLOC
 38         select HAVE_DEBUG_STACKOVERFLOW
 39 
 40 config TRACE_IRQFLAGS_SUPPORT
 41         def_bool y
 42 
 43 config LOCKDEP_SUPPORT
 44         def_bool y
 45 
 46 config SCHED_OMIT_FRAME_POINTER
 47         def_bool y
 48 
 49 config GENERIC_CSUM
 50         def_bool y
 51 
 52 config RWSEM_GENERIC_SPINLOCK
 53         def_bool y
 54 
 55 config ARCH_FLATMEM_ENABLE
 56         def_bool y
 57 
 58 config MMU
 59         def_bool y
 60 
 61 config NO_IOPORT_MAP
 62         def_bool y
 63 
 64 config GENERIC_CALIBRATE_DELAY
 65         def_bool y
 66 
 67 config GENERIC_HWEIGHT
 68         def_bool y
 69 
 70 config STACKTRACE_SUPPORT
 71         def_bool y
 72         select STACKTRACE
 73 
 74 config HAVE_LATENCYTOP_SUPPORT
 75         def_bool y
 76 
 77 source "init/Kconfig"
 78 source "kernel/Kconfig.freezer"
 79 
 80 menu "ARC Architecture Configuration"
 81 
 82 menu "ARC Platform/SoC/Board"
 83 
 84 source "arch/arc/plat-arcfpga/Kconfig"
 85 source "arch/arc/plat-tb10x/Kconfig"
 86 #New platform adds here
 87 
 88 endmenu
 89 
 90 menu "ARC CPU Configuration"
 91 
 92 choice
 93         prompt "ARC Core"
 94         default ARC_CPU_770
 95 
 96 config ARC_CPU_750D
 97         bool "ARC750D"
 98         help
 99           Support for ARC750 core
100 
101 config ARC_CPU_770
102         bool "ARC770"
103         select ARC_CPU_REL_4_10
104         help
105           Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
106           This core has a bunch of cool new features:
107           -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
108                    Shared Address Spaces (for sharing TLB entires in MMU)
109           -Caches: New Prog Model, Region Flush
110           -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
111 
112 endchoice
113 
114 config CPU_BIG_ENDIAN
115         bool "Enable Big Endian Mode"
116         default n
117         help
118           Build kernel for Big Endian Mode of ARC CPU
119 
120 # If a platform can't work with 0x8000_0000 based dma_addr_t
121 config ARC_PLAT_NEEDS_CPU_TO_DMA
122         bool
123 
124 config SMP
125         bool "Symmetric Multi-Processing (Incomplete)"
126         default n
127         help
128           This enables support for systems with more than one CPU. If you have
129           a system with only one CPU, say N. If you have a system with more
130           than one CPU, say Y.
131 
132 if SMP
133 
134 config ARC_HAS_COH_CACHES
135         def_bool n
136 
137 config ARC_HAS_REENTRANT_IRQ_LV2
138         def_bool n
139 
140 endif
141 
142 config NR_CPUS
143         int "Maximum number of CPUs (2-4096)"
144         range 2 4096
145         depends on SMP
146         default "2"
147 
148 menuconfig ARC_CACHE
149         bool "Enable Cache Support"
150         default y
151         # if SMP, cache enabled ONLY if ARC implementation has cache coherency
152         depends on !SMP || ARC_HAS_COH_CACHES
153 
154 if ARC_CACHE
155 
156 config ARC_CACHE_LINE_SHIFT
157         int "Cache Line Length (as power of 2)"
158         range 5 7
159         default "6"
160         help
161           Starting with ARC700 4.9, Cache line length is configurable,
162           This option specifies "N", with Line-len = 2 power N
163           So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
164           Linux only supports same line lengths for I and D caches.
165 
166 config ARC_HAS_ICACHE
167         bool "Use Instruction Cache"
168         default y
169 
170 config ARC_HAS_DCACHE
171         bool "Use Data Cache"
172         default y
173 
174 config ARC_CACHE_PAGES
175         bool "Per Page Cache Control"
176         default y
177         depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
178         help
179           This can be used to over-ride the global I/D Cache Enable on a
180           per-page basis (but only for pages accessed via MMU such as
181           Kernel Virtual address or User Virtual Address)
182           TLB entries have a per-page Cache Enable Bit.
183           Note that Global I/D ENABLE + Per Page DISABLE works but corollary
184           Global DISABLE + Per Page ENABLE won't work
185 
186 config ARC_CACHE_VIPT_ALIASING
187         bool "Support VIPT Aliasing D$"
188         depends on ARC_HAS_DCACHE
189         default n
190 
191 endif   #ARC_CACHE
192 
193 config ARC_HAS_ICCM
194         bool "Use ICCM"
195         help
196           Single Cycle RAMS to store Fast Path Code
197         default n
198 
199 config ARC_ICCM_SZ
200         int "ICCM Size in KB"
201         default "64"
202         depends on ARC_HAS_ICCM
203 
204 config ARC_HAS_DCCM
205         bool "Use DCCM"
206         help
207           Single Cycle RAMS to store Fast Path Data
208         default n
209 
210 config ARC_DCCM_SZ
211         int "DCCM Size in KB"
212         default "64"
213         depends on ARC_HAS_DCCM
214 
215 config ARC_DCCM_BASE
216         hex "DCCM map address"
217         default "0xA0000000"
218         depends on ARC_HAS_DCCM
219 
220 config ARC_HAS_HW_MPY
221         bool "Use Hardware Multiplier (Normal or Faster XMAC)"
222         default y
223         help
224           Influences how gcc generates code for MPY operations.
225           If enabled, MPYxx insns are generated, provided by Standard/XMAC
226           Multipler. Otherwise software multipy lib is used
227 
228 choice
229         prompt "ARC700 MMU Version"
230         default ARC_MMU_V3 if ARC_CPU_770
231         default ARC_MMU_V2 if ARC_CPU_750D
232 
233 config ARC_MMU_V1
234         bool "MMU v1"
235         help
236           Orig ARC700 MMU
237 
238 config ARC_MMU_V2
239         bool "MMU v2"
240         help
241           Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
242           when 2 D-TLB and 1 I-TLB entries index into same 2way set.
243 
244 config ARC_MMU_V3
245         bool "MMU v3"
246         depends on ARC_CPU_770
247         help
248           Introduced with ARC700 4.10: New Features
249           Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
250           Shared Address Spaces (SASID)
251 
252 endchoice
253 
254 
255 choice
256         prompt "MMU Page Size"
257         default ARC_PAGE_SIZE_8K
258 
259 config ARC_PAGE_SIZE_8K
260         bool "8KB"
261         help
262           Choose between 8k vs 16k
263 
264 config ARC_PAGE_SIZE_16K
265         bool "16KB"
266         depends on ARC_MMU_V3
267 
268 config ARC_PAGE_SIZE_4K
269         bool "4KB"
270         depends on ARC_MMU_V3
271 
272 endchoice
273 
274 config ARC_COMPACT_IRQ_LEVELS
275         bool "ARCompact IRQ Priorities: High(2)/Low(1)"
276         default n
277         # Timer HAS to be high priority, for any other high priority config
278         select ARC_IRQ3_LV2
279         # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
280         depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
281 
282 if ARC_COMPACT_IRQ_LEVELS
283 
284 config ARC_IRQ3_LV2
285         bool
286 
287 config ARC_IRQ5_LV2
288         bool
289 
290 config ARC_IRQ6_LV2
291         bool
292 
293 endif
294 
295 config ARC_FPU_SAVE_RESTORE
296         bool "Enable FPU state persistence across context switch"
297         default n
298         help
299           Double Precision Floating Point unit had dedictaed regs which
300           need to be saved/restored across context-switch.
301           Note that ARC FPU is overly simplistic, unlike say x86, which has
302           hardware pieces to allow software to conditionally save/restore,
303           based on actual usage of FPU by a task. Thus our implemn does
304           this for all tasks in system.
305 
306 config ARC_CANT_LLSC
307         def_bool n
308 
309 menuconfig ARC_CPU_REL_4_10
310         bool "Enable support for Rel 4.10 features"
311         default n
312         help
313           -ARC770 (and dependent features) enabled
314           -ARC750 also shares some of the new features with 770
315 
316 config ARC_HAS_LLSC
317         bool "Insn: LLOCK/SCOND (efficient atomic ops)"
318         default y
319         depends on ARC_CPU_770 && !ARC_CANT_LLSC
320 
321 config ARC_HAS_SWAPE
322         bool "Insn: SWAPE (endian-swap)"
323         default y
324         depends on ARC_CPU_REL_4_10
325 
326 config ARC_HAS_RTSC
327         bool "Insn: RTSC (64-bit r/o cycle counter)"
328         default y
329         depends on ARC_CPU_REL_4_10
330         depends on !SMP
331 
332 endmenu   # "ARC CPU Configuration"
333 
334 config LINUX_LINK_BASE
335         hex "Linux Link Address"
336         default "0x80000000"
337         help
338           ARC700 divides the 32 bit phy address space into two equal halves
339           -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
340           -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
341           Typically Linux kernel is linked at the start of untransalted addr,
342           hence the default value of 0x8zs.
343           However some customers have peripherals mapped at this addr, so
344           Linux needs to be scooted a bit.
345           If you don't know what the above means, leave this setting alone.
346 
347 config ARC_CURR_IN_REG
348         bool "Dedicate Register r25 for current_task pointer"
349         default y
350         help
351           This reserved Register R25 to point to Current Task in
352           kernel mode. This saves memory access for each such access
353 
354 
355 config ARC_EMUL_UNALIGNED
356         bool "Emulate unaligned memory access (userspace only)"
357         select SYSCTL_ARCH_UNALIGN_NO_WARN
358         select SYSCTL_ARCH_UNALIGN_ALLOW
359         help
360           This enables misaligned 16 & 32 bit memory access from user space.
361           Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
362           potential bugs in code
363 
364 config HZ
365         int "Timer Frequency"
366         default 100
367 
368 config ARC_METAWARE_HLINK
369         bool "Support for Metaware debugger assisted Host access"
370         default n
371         help
372           This options allows a Linux userland apps to directly access
373           host file system (open/creat/read/write etc) with help from
374           Metaware Debugger. This can come in handy for Linux-host communication
375           when there is no real usable peripheral such as EMAC.
376 
377 menuconfig ARC_DBG
378         bool "ARC debugging"
379         default y
380 
381 config ARC_DW2_UNWIND
382         bool "Enable DWARF specific kernel stack unwind"
383         depends on ARC_DBG
384         default y
385         select KALLSYMS
386         help
387           Compiles the kernel with DWARF unwind information and can be used
388           to get stack backtraces.
389 
390           If you say Y here the resulting kernel image will be slightly larger
391           but not slower, and it will give very useful debugging information.
392           If you don't debug the kernel, you can say N, but we may not be able
393           to solve problems without frame unwind information
394 
395 config ARC_DBG_TLB_PARANOIA
396         bool "Paranoia Checks in Low Level TLB Handlers"
397         depends on ARC_DBG
398         default n
399 
400 config ARC_DBG_TLB_MISS_COUNT
401         bool "Profile TLB Misses"
402         default n
403         select DEBUG_FS
404         depends on ARC_DBG
405         help
406           Counts number of I and D TLB Misses and exports them via Debugfs
407           The counters can be cleared via Debugfs as well
408 
409 config ARC_BUILTIN_DTB_NAME
410         string "Built in DTB"
411         help
412           Set the name of the DTB to embed in the vmlinux binary
413           Leaving it blank selects the minimal "skeleton" dtb
414 
415 source "kernel/Kconfig.preempt"
416 
417 menu "Executable file formats"
418 source "fs/Kconfig.binfmt"
419 endmenu
420 
421 endmenu  # "ARC Architecture Configuration"
422 
423 source "mm/Kconfig"
424 source "net/Kconfig"
425 source "drivers/Kconfig"
426 source "fs/Kconfig"
427 source "arch/arc/Kconfig.debug"
428 source "security/Kconfig"
429 source "crypto/Kconfig"
430 source "lib/Kconfig"

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