shithub: front

ref: e969575d2e55eec89d3a2765b974e023123d8fa5
dir: /sys/src/ape/lib/ap/386/cycles.s/

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#define RDTSC 		BYTE $0x0F; BYTE $0x31

TEXT _cycles(SB),1,$0		/* time stamp counter; cycles since power up */
	RDTSC
	MOVL	vlong+0(FP), CX	/* &vlong */
	MOVL	AX, 0(CX)	/* lo */
	MOVL	DX, 4(CX)	/* hi */
	RET