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| cr1901_modern | Not that you're asking for input, but AIUI VIPT is the way to do for a simple MMU | 03:14 |
|---|---|---|
| cr1901_modern | go* | 03:14 |
| * ZipCPU googles VIPT | 03:15 | |
| cr1901_modern | Virtually-Indexed Physically Tagged | 03:16 |
| ZipCPU | Fascinating topic | 03:16 |
| cr1901_modern | it allows latency hiding because cache access happens in parallel with MMU decoding | 03:17 |
| cr1901_modern | there is a potential problem with aliasing though | 03:17 |
| ZipCPU | I'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_modern | what is "aliasing"? I don't remember, I just know it's bad. :) | 03:17 |
| ZipCPU | Getting 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_modern | ZipCPU: I don't think your impl excludes VIPT; the MMU _is_ physically separate in VIPT. | 03:30 |
| ZipCPU | If that's the case, I might need to dig into it some more. | 03:33 |
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