#define TBRL	268#define TBRU	269		/* Time base Upper/Lower (Reading) */ /* * time stamp counter; _cycles since power up * Runs at fasthz/4 cycles per second (m->clkin>>3) */TEXT cycles(SB),1,$0loop:	MOVW	SPR(TBRU),R7	MOVW	SPR(TBRL),R8	MOVW	SPR(TBRU),R5	CMP	R5,R7	BNE	loop	MOVW	R7,0(R3)	MOVW	R8,4(R3)	RETURN