before I-cache

By: anonymou5 (no.delete@this.spam.com), February 22, 2020 3:49 pm
Room: Moderated Discussions
> Slightly on topic, a number of the heavily microcoded IBM mainframes of the 1970s, 80s
> and 90s, which all had rewritable control storage (microcode RAM), could also overflow
> microcode in a partitioned-off section of main memory. Thus little used microcode functions
> could be punted to much the much cheaper (and larger), if slower, main memory.

US 6,154,834 -- Intel's Pentium II

the whole PRMR concept (special MTRR to protect SGX and other stuff) seems to go back far

also, with all the recent security fixes, I wonder how much on-die patch space they have left
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