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