+2015-08-19 Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com>
+
+ * sysdeps/powerpc/sys/platform/ppc.h (__ppc_set_ppr_med_high,
+ __ppc_set_ppr_very_low): New functions.
+ * manual/platform.texi: Add documentation about
+ __ppc_set_ppr_med_high and __ppc_set_ppr_very_low.
+
2015-08-19 Wilco Dijkstra <wdijkstr@arm.com>
* string/stpncpy.c (stpncpy): Improve performance using
@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}}
Set the Program Priority Register to medium low value.
@end deftypefun
+
+Power ISA 2.07 extends the priorities that can be set to the Program Priority
+Register (PPR). The following functions implement the new priority levels:
+very low and medium high.
+
+@deftypefun {void} __ppc_set_ppr_very_low (void)
+@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}}
+Set the Program Priority Register to very low value.
+@end deftypefun
+
+@deftypefun {void} __ppc_set_ppr_med_high (void)
+@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}}
+Set the Program Priority Register to medium high value. The medium high
+priority is privileged and may only be set during certain time intervals by
+problem-state programs. If the program priority is medium high when the time
+interval expires or if an attempt is made to set the priority to medium high
+when it is not allowed, the priority is set to medium.
+@end deftypefun
__asm__ volatile ("or 1,1,1");
}
+/* Power ISA 2.07 (Book II, Chapter 3) extends the priorities that can be set
+ to the Program Priority Register (PPR). The form 'or Rx,Rx,Rx' is used to
+ modify the PRI field of the PPR, the same way as described above.
+ The new priority levels are:
+ Rx = 31 (very low)
+ Rx = 5 (medium high)
+ Any program can set the priority to very low, low, medium low, and medium,
+ as these are unprivileged.
+ The medium high priority, on the other hand, is privileged, and may only be
+ set during certain time intervals by problem-state programs. If the program
+ priority is medium high when the time interval expires or if an attempt is
+ made to set the priority to medium high when it is not allowed, the PRI
+ field is set to medium.
+ */
+
+#ifdef _ARCH_PWR8
+
+static inline void
+__ppc_set_ppr_very_low (void)
+{
+ __asm__ volatile ("or 31,31,31");
+}
+
+static inline void
+__ppc_set_ppr_med_high (void)
+{
+ __asm__ volatile ("or 5,5,5");
+}
+
+#endif
+
#endif /* sys/platform/ppc.h */