powerpc/8xx: Move SW perf counters in first 32kb of memory

Browse source

In order to simplify time critical exceptions handling 8xx
specific SW perf counters, this patch moves the counters into
the beginning of memory. This is possible because .text is readable
and the counters are never modified outside of the handlers.

By doing this, we avoid having to set a second register with
the upper part of the address of the counters.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

...

This commit is contained in:

Christophe Leroy 2018-11-29 14:07:11 +00:00 • committed by Michael Ellerman

parent 32bff4b905

commit 8cfe4f5242

1 changed files with 28 additions and 30 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

58

arch/powerpc/kernel/head_8xx.S

View file