CVS commit: src/sys/arch/m68k/m68k

["Jason R Thorpe" <thorpej%netbsd.org@localhost>]

Module Name:    src
Committed By:   thorpej
Date:           Wed Nov 26 18:51:08 UTC 2025

Modified Files:
        src/sys/arch/m68k/m68k: pmap_68k.c

Log Message:
Sprinkle ATC hits in a few more locations:

* pmap_pv_enter(), when page is already marked as CI: This one is required
  for the same reason as the previous change was required.

* pmap_enter(): Also need an ATC hit in the case of a non-managed physical
  address (demand-page-in of device mapping?)

* pmap_kenter_pa(): Add an ATC hit here after storing the PTE, but this is
  really just over-caution, I think; we're not dealing with VA regsions
  that would have been subject to a demand-page-in, so there should not
  be any negative entries to worry about.  Possible future optimization.

* pmap_zero_page(), pmap_copy_page(): Same situation as pmap_kenter_pa().
  These addresses are even more tightly controlled, so this is probably
  the first "probably uncessary ATC hit" that should be removed once this
  implementation is shown to be stable across a variety of machines.

Add a comment in pmap_enter() for the case where an old mapping must be
removed before inserting the new one: since we're going to hit the ATC
after storing the new PTE, we can probably elide the ATC hit when removing
this mapping.  Possible future optimization.


To generate a diff of this commit:
cvs rdiff -u -r1.31 -r1.32 src/sys/arch/m68k/m68k/pmap_68k.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.