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
mfmsr/rlwinm/mtmsr.
All 8xx? What other models? (5xx for example).
At least 823, 860, 866 and 885 have it.
Looks like the 5xx have it too (at least the 565). Does Linux supports
that one at all ?
8272 and 8323 don't have it.
+/* 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) */
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) :-(
Christophe
