Subject: Temporary GPR mapping
To: None <port-powerpc@netbsd.org>
From: karan khanna <karan@cdotd.ernet.in>
List: port-powerpc
Date: 02/02/2001 16:53:19
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Hi All !!!
This is a query regarding the temporary mapping of the GPR's
(specific to 603e).
It has been mentioned in the 603e manual that when TGPR (14 th ) bit
in the
MSR is set it makes a duplicate copy of GPR0 - GPR3 and TGPR0 -
TGPR3
are made available and any operations made on GPR0-3 is done on
TGPR0-3.
But it also has been mentioned that these are to be used in TLB miss
routines.
My query is realted to this i.e whether these registers can be made
available only
during the processing of any exception by just setting the TGPR bit
in MSR or
is it specific to TBL exceptions only.
regards
karan
--
***************************************************************************
When the going gets tough...
The tough get going.
***************************************************************************
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Hi All !!!
<p> This is a query regarding the temporary mapping of
the GPR's (specific to 603e).
<br> It has been mentioned in the 603e manual that when
TGPR (14 th ) bit in the
<br> MSR is set it makes a duplicate copy of GPR0
- GPR3 and TGPR0 - TGPR3
<br> are made available and any operations made on GPR0-3
is done on TGPR0-3.
<p> But it also has been mentioned that these are to
be used in TLB miss routines.
<br> My query is realted to this i.e whether these registers
can be made available only
<br> during the processing of any exception by just setting
the TGPR bit in MSR or
<br> is it specific to TBL exceptions only.
<p>regards
<br>karan
<br>
<pre>--
***************************************************************************
When the going gets tough...
The tough get going.
***************************************************************************</pre>
</html>
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