Subject: Re: Temporary GPR mapping
To: karan khanna <firstname.lastname@example.org>
From: Ignatios Souvatzis <email@example.com>
Date: 02/02/2001 19:44:40
On Fri, Feb 02, 2001 at 04:53:19PM +0530, karan khanna wrote:
> 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 -
> are made available and any operations made on GPR0-3 is done on
> But it also has been mentioned that these are to be used in TLB miss
> 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.
well, if the TLB miss handler is using them, you can`t use them for
anything else, right?
Technically it would work, I guess, making the next TLB miss overwrite them.