On Mon, 9 May 2016, Ralf Baechle wrote: > Already PMC-Sierra's RM9000 / E9000 core had an extended ASID field, of > 12 bits for 4096 ASID contexts. Afaics this was an extension derived > in-house back in the wild days before everything had to be sanctioned by > the architecture folks, so there is nothing in a config register to test > for it. Couldn't you just probe it in EntryHi directly, by writing all-ones, reading back and seeing how many bits have stuck? > PMCS simply extended the ASID field to 12 bits; no of the EntryHi bits > which today would conflict doing so did exist back then. Especially as it was as simple like that -- bits 12:8 were hardwired to zeros in the usual implementations back then. Maciej
