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by Followerer
2108 days ago
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The AMX is an accelerator block... If you concluded otherwise, your reverse-engineering skills are not great... Let me repeat this: part of the ARM architectural license says that you can't modify the ISA. You have to implement a whole subset (the manual says what's mandatory and what's optional), and only that. This is, as I've been saying, public knowledge. This is how it works. And there are very good reasons for this, like avoiding fragmentation and losing control of their own ISA. And once again, stop spreading misinformation. |
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Specifically about the Apple case,
After your tone, not certainly obligated to answer but will write one quickly...
Apple A13 adds AMX, a set of (mostly) AI acceleration instructions that are also useful for matrix math in general. The AMX configuration happens at the level of the AMX_CONFIG_EL1/EL12/EL2/EL21 registers, with AMX_STATE_T_EL1 and AMX_CONTEXT_EL1 being also present.
The list of instructions is at https://pastebin.ubuntu.com/p/xZmmVF7tS8/ (didn't bother to document it publicly at least at this point).
Hopefully that clears things up a bit,
And please don't ever do this again, thank you. (this also doesn't comply with the guidelines)
-- a member of the checkra1n team