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caches: work without writeBack stage 

In the case of an MMU miss, the data caches will create a retry branch port.
These currently implicitly go into the memory/writeBack stage, however
not all CPUs have this stage.

Place the retry branch port into the correct stage.

Signed-off-by: Sean Cross <sean@xobs.io>
This commit is contained in:
Sean Cross 2019-04-26 18:02:43 +08:00
parent 955e70206c
commit b0199297fd
2 changed files with 2 additions and 2 deletions
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2
src/main/scala/vexriscv/plugin/DBusCachedPlugin.scala
View File

@ -143,7 +143,7 @@ class DBusCachedPlugin(config : DataCacheConfig,
decoderService.add(FENCE, Nil) decoderService.add(FENCE, Nil)
mmuBus = pipeline.service(classOf[MemoryTranslator]).newTranslationPort(MemoryTranslatorPort.PRIORITY_DATA ,memoryTranslatorPortConfig) mmuBus = pipeline.service(classOf[MemoryTranslator]).newTranslationPort(MemoryTranslatorPort.PRIORITY_DATA ,memoryTranslatorPortConfig)
redoBranch = pipeline.service(classOf[JumpService]).createJumpInterface(pipeline.writeBack) redoBranch = pipeline.service(classOf[JumpService]).createJumpInterface(if(pipeline.writeBack != null) pipeline.writeBack else pipeline.execute)
if(catchSomething) if(catchSomething)
exceptionBus = pipeline.service(classOf[ExceptionService]).newExceptionPort(pipeline.writeBack) exceptionBus = pipeline.service(classOf[ExceptionService]).newExceptionPort(pipeline.writeBack)

2
src/main/scala/vexriscv/plugin/DBusSimplePlugin.scala
View File

@ -309,7 +309,7 @@ class DBusSimplePlugin(catchAddressMisaligned : Boolean = false,
if(memoryTranslatorPortConfig != null) { if(memoryTranslatorPortConfig != null) {
mmuBus = pipeline.service(classOf[MemoryTranslator]).newTranslationPort(MemoryTranslatorPort.PRIORITY_DATA, memoryTranslatorPortConfig) mmuBus = pipeline.service(classOf[MemoryTranslator]).newTranslationPort(MemoryTranslatorPort.PRIORITY_DATA, memoryTranslatorPortConfig)
redoBranch = pipeline.service(classOf[JumpService]).createJumpInterface(pipeline.memory) redoBranch = pipeline.service(classOf[JumpService]).createJumpInterface(if(pipeline.memory != null) pipeline.memory else pipeline.execute)
} }
} }