powerpc/of: Remove useless register save/restore when calling OF back

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enter_prom() used to save and restore registers such as CTR, XER etc..
which are volatile, or SRR0,1... which we don't care about. This
removes a bunch of useless code and while at it turns an mtmsrd into
an MTMSRD macro which will be useful to Book3E.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

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Benjamin Herrenschmidt 2009-07-23 23:15:07 +00:00

parent 7d60b02cc7

commit 6c1719942e

1 changed files with 6 additions and 32 deletions

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arch/powerpc/kernel/entry_64.S

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