New pmap status update

[Jason Thorpe <thorpej%me.com@localhost>]

Howdy folks (and to all those celebrating in the US, happy Thanksgiving…)

Just wanted to provide a quick status update on the new pmap module.

Thanks to help from Isaki-san and Tsusui-san, a bunch of platforms have been adapted and several critical bugs ironed out.  I think we’re ready for some more rigorous testing, and also some help in adapting some of the remaining platforms.

First off, where we are in terms of “how well does it work?”

- virt68k runs very well with the new pmap, including with large (e.g. 3GB) memory configurations.  That platform has switched to using the new pmap by default.

- hp300 and luna68k boot up to multi-user on 68030 and at least single-user on 68040 (probably will boot multi-user, fingers crossed :-)

- news68k has been adapted, but the last time this platform was tested, there was an issue (possibly related to external cache?)

- x68k has been lightly tested before the most recent fixes for 68040.

Work still to be done:

- mvme68k and next68k have been adapted, but not tested yet.

- cesfic has yet to be adapted.  This one will be easy, but I don’t know anyone who has a board, so it will probably go untested.

- amiga and Atari need to be adapted, but they’re going to be much more difficult due to the very different start-up code.

- mac68k needs to be adapted.  Looks to be not hard like amiga, but not easy like some of the others.

- Needs testing on 68020 (should Just Work) and 68060 (probably not any worse than 68040).

- Needs testing on HP MMU systems.

-- thorpej