kleink ba482b3950 * On the 601, obliterate all BAT entries when returning from kernel to
userlevel; this is necessary due to the 601, unlike other 6xx, having
  no concept of separated Valid_user vs. Valid_supervisor for BATs.
* When crossing the kernel/userlevel boundary, have platform-provided
  hooks set up the two fixed BAT entries, and possibly additional
  segment registers to redeem the 601's BAT limitations.

Both of the above are only built if the $MACHINE provides these hooks,
sparing others the pain.
2002-05-02 16:47:49 +00:00
2002-05-02 16:47:12 +00:00
2002-05-02 15:38:07 +00:00
2002-05-02 14:24:06 +00:00
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