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CVS commit: src/sys/arch/powerpc/ibm4xx

Module Name:    src
Committed By:   rin
Date:           Fri Feb 21 14:49:58 UTC 2020

Modified Files:
        src/sys/arch/powerpc/ibm4xx: trap.c

Log Message:
Tiny improvements to copyin() and copyout():

- Use lwz/stw instead of 4-byte lswi/stswi for 405 and later, which
  support unaligned word load/store by hardware. In many cases, both
  source and destination are aligned on word boundaries.

- Use dcbst instead of dcbf to flush cache. The former does not
  invalidate the cache line. Copied data should be used soon after.

To generate a diff of this commit:
cvs rdiff -u -r1.76 -r1.77 src/sys/arch/powerpc/ibm4xx/trap.c

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

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