CVS commit: src/sys/arch/aarch64

["Nick Hudson" <skrll%netbsd.org@localhost>]

Module Name:    src
Committed By:   skrll
Date:           Tue May 12 13:07:53 UTC 2026

Modified Files:
        src/sys/arch/aarch64/aarch64: pmap_machdep.c
        src/sys/arch/aarch64/include: pmap_machdep.h

Log Message:
aarch64: fix mod/ref emulation in the MI pmap support code

Correct the initial PTE settings as per the table below

   ref |  mod |  AF |      AP |  OS_MODEMUL
  emul | emul |     |         |
  -----+------+-----+---------+------------
    no |  no  | set |   RO/RW |  not set
   yes |  no  | clr |   RO/RW |  not set
    no | yes  | set |      RO |  set
   yes | yes  | clr |      RO |  set

  [*] a write fault should be fixed up, and allowed.

and detect the modified emulation using OS_MODEMUL in pmap_fault fixup.

TODO:
- MI PMAP pmap_clear_reference needs to look more like pmap_clear_modify
  and actually change PTE entries.
- MI PMAP needs support for HW updated modified and referenced bits.


To generate a diff of this commit:
cvs rdiff -u -r1.14 -r1.15 src/sys/arch/aarch64/aarch64/pmap_machdep.c
cvs rdiff -u -r1.13 -r1.14 src/sys/arch/aarch64/include/pmap_machdep.h

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