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authorGabriel F. T. Gomes <gftg@linux.vnet.ibm.com>2015-08-10 10:58:12 -0300
committerTulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>2015-08-19 17:43:26 -0300
commit1747fcda4902a3b46183d93fb16ed9b436b2608b (patch)
treeae11b87990c3cdd3e25b2533dd60a2a2dac16bb0 /manual
parent1f3be1988bce6756ad8cd37386eedef95aa0f2ed (diff)
PowerPC: Extend Program Priority Register support
This patch adds extra inline functions to change the Program Priority Register from ISA 2.07. 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.
Diffstat (limited to 'manual')
-rw-r--r--manual/platform.texi18
1 files changed, 18 insertions, 0 deletions
diff --git a/manual/platform.texi b/manual/platform.texi
index 872e32ecb3..cb166641fb 100644
--- a/manual/platform.texi
+++ b/manual/platform.texi
@@ -97,3 +97,21 @@ Set the Program Priority Register to low value.
@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