diff options
Diffstat (limited to 'sysdeps/powerpc/sys/platform/ppc.h')
| -rw-r--r-- | sysdeps/powerpc/sys/platform/ppc.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/sysdeps/powerpc/sys/platform/ppc.h b/sysdeps/powerpc/sys/platform/ppc.h index 3febb61e61..2594606504 100644 --- a/sysdeps/powerpc/sys/platform/ppc.h +++ b/sysdeps/powerpc/sys/platform/ppc.h @@ -112,4 +112,35 @@ __ppc_set_ppr_low (void) __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 */ |