#define RDTSCP WORD $0x010F; BYTE $0xF9#define RDTSC  WORD $0x310F TEXT tstart(SB), 1, $0	CPUID	RDTSC	MOVL c+0(FP), CX	MOVL AX, 0(CX)	MOVL DX, 4(CX)	RET TEXT _tend(SB), 1, $0	RDTSC	MOVL c+0(FP), CX	MOVL AX, 0(CX)	MOVL DX, 4(CX)	CPUID	RET TEXT _tendp(SB), 1, $0	RDTSCP	MOVL c+0(FP), CX	MOVL AX, 0(CX)	MOVL DX, 4(CX)	CPUID	RET TEXT cpuid(SB), 1, $0	MOVL rep+0(FP), BP	MOVL ax+4(FP), AX	MOVL cx+8(FP), CX	CPUID	MOVL AX, 0(BP)	MOVL BX, 4(BP)	MOVL CX, 8(BP)	MOVL DX, 12(BP)	RET