ref: 78e2f69c0d7e4c17227e1ec0545cbb2a0ae1e96e
dir: /sys/src/libc/power64/tas.s/
TEXT _tas(SB), $0
SYNC
MOVD RARG, R4
MOVWZ $0xdeaddead,R5
tas1:
/* taken out for the 755. dcbf and L2 caching do not seem to get on
with eachother. It seems that dcbf is desctructive in the L2 cache
(also see l.s) */
// DCBF (R4)
SYNC
LWAR (R4), RARG
CMP RARG, $0
BNE tas0
STWCCC R5, (R4)
BNE tas1
tas0:
SYNC
ISYNC
RETURN