Saturday, 2018-12-22

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cr1901_modernNot that you're asking for input, but AIUI VIPT is the way to do for a simple MMU03:14
cr1901_moderngo*03:14
* ZipCPU googles VIPT03:15
cr1901_modernVirtually-Indexed Physically Tagged03:16
ZipCPUFascinating topic03:16
cr1901_modernit allows latency hiding because cache access happens in parallel with MMU decoding03:17
cr1901_modernthere is a potential problem with aliasing though03:17
ZipCPUI've thought of doing something similar, but its a data movement issue for me.  I need to figure out how to get MMU data into the cache.  (The two are separate in my current implementation.)03:17
cr1901_modernwhat is "aliasing"? I don't remember, I just know it's bad. :)03:17
ZipCPUGetting the physical tag in there isn't so hard, checking against the current physical tag is going to be harder.03:17
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cr1901_modernZipCPU: I don't think your impl excludes VIPT; the MMU _is_ physically separate in VIPT.03:30
ZipCPUIf that's the case, I might need to dig into it some more.03:33
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