upstream/opnsense-src
1
0
Fork 0
mirror of https://github.com/opnsense/src.git synced 2026-06-09 08:43:19 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

powerpc: Set very low priority mode while waiting for AP unleash event

Browse source 
The POWER9 does not recognize 'or 27,27,27' as a thread priority NOP.  On
earlier POWER architectures, this NOP would note to the processor to give up
resources if able, to improve performance of other threads.

All processors that support the thread priority NOPs recognize the
'or 31,31,31' NOP as very low priority, so use this to perform a similar
function, and not burn cycles on POWER9.
This commit is contained in:
Justin Hibbits 2018-12-06 04:36:02 +00:00
parent ac37786a0a
commit 76748087bf
1 changed files with 1 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
sys/powerpc/powerpc/mp_machdep.c
View file

@ -78,7 +78,7 @@ machdep_ap_bootstrap(void)
__asm __volatile("msync; isync");
while (ap_letgo == 0)
__asm __volatile("or 27,27,27");
__asm __volatile("or 31,31,31");
__asm __volatile("or 6,6,6");
/*