On Thu, Mar 15, 2001 at 12:23:57PM -0800, Tyrel Beede wrote:

 > I've been looking at the trap.c file for the sh3 port and I was
 > wondering about some specific differences between the handling of the
 > sh3 vs. sh4 arch in the trap.c file.  I've yet to figure out why the
 > SH4_P1SEG_TO_P2SEG is needed for the sh4... I checked out the hardware
 > docs for both cpus and I didn't find much difference, at least after a
 > quick look, between the two MMUs.
 > 
 > Also, in some cases there is a check for vm != NULL which is only
 > applied to the sh4 cpu and not the sh3... I'm not sure what his is
 > about.

I personally think these are simply work-arounds for bugs in the pmap
and TLB fault code.

-- 
        -- Jason R. Thorpe <thorpej@zembu.com>