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<DIV><FONT face=Arial size=2><SPAN class=455115021-15022006>Is there a way to
put certain exception handler(e.g. machine check) on e500 to a cache-inhibited
region? </SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=455115021-15022006></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=455115021-15022006>1. The e500 kernel
puts exception handlers at the starting of the physical
memory.</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN class=455115021-15022006>2. All the physical
memory are covered by a few TLB1s to do 0xc0000000-0x00000000
translation.</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN class=455115021-15022006>3. We can
not add a new TLB1 to map a small piece of memory, because it has
boundary limitation(4K...256M). We can not use two TLB1 to overlap since it will
cause program error.</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN class=455115021-15022006>4. When we tried to
move a handler(e.g. machine check) to a different location, the kernel won't
boot.</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN class=455115021-15022006>5. We don't want to
map all the exceptional handlers to be cache inhibited, say, the first 1MB, the
performance will be horrible if we do so.</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=455115021-15022006></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=455115021-15022006>Is there a way at
all to tweak things like this, i.e., put an exception handler into a piece of
memory that is cache-inhibited?</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=455115021-15022006></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=455115021-15022006>I also thought about
use mlock/mmap on /dev/mem, move the specific exception handler to a high
address then use a separate TLB1 to cover it(need change link script?),etc.
</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=455115021-15022006></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=455115021-15022006>Any suggestion is
greatly appreciated.</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=455115021-15022006></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN
class=455115021-15022006>xianghua</SPAN></FONT></DIV>
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class=455115021-15022006></SPAN></FONT> </DIV></BODY></HTML>