[PATCH] powerpc/8xx: use SPRN_EIE and SPRN_EID to enable/disable interrupts
segher at kernel.crashing.org
Fri Aug 19 03:54:11 AEST 2016
On Thu, Aug 18, 2016 at 06:52:47PM +0200, Christophe Leroy wrote:
> Le 18/08/2016 à 18:34, Segher Boessenkool a écrit :
> >On Thu, Aug 18, 2016 at 05:56:02PM +0200, Christophe Leroy wrote:
> >>The 8xx has two special registers called EID (External Interrupt
> >>Disable) and EIE (External Interrupt Enable) for clearing/setting
> >>EE in MSR. It avoids the three instructions set mfmsr/ori/mtmsr or
> >All 8xx? What other models? (5xx for example).
> At least 823, 860, 866 and 885 have it.
I haven't been able to find a manual for all 8xx. But there is AN2055,
which suggests EIE etc. is for all 8xx indeed.
> Looks like the 5xx have it too (at least the 565). Does Linux supports
> that one at all ?
All 5xx have it, there is a manual for *that* ("RCPU") :-)
> >>+/* Special MSR manipulation registers */
> >>+#define SPRN_EIE 80 /* External interrupt enable (EE=1, RI=1) */
> >>+#define SPRN_EID 81 /* External interrupt disable (EE=0, RI=1) */
> >>+#define SPRN_NRI 81 /* Non Recoverable interrupt (EE=0, RI=0) */
Is it correct to set RI in all places you do now?
> >This is wrong (NRI is 82). Don't write code you cannot test / don't submit
> >code you haven't tested? :-)
> Oops. You're right, copy/paste failure.
> Was tested on an 885. Unfortunatly SPRN_NRI is not used (yet) :-(
Well, that was my point!
More information about the Linuxppc-dev