ref: 0a7279b3aff262493e5c80f17a540a4b5e8987a5
dir: /sys/src/libc/power64/tas.s/
TEXT _tas(SB), $0
SYNC
MOVD R3, 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), R3
CMP R3, $0
BNE tas0
STWCCC R5, (R4)
BNE tas1
tas0:
SYNC
ISYNC
RETURN