cpuid_amd64.s

// Copyright (c) 2015 Klaus Post, released under MIT License. See LICENSE file.

// func asmCpuid(op uint32) (eax, ebx, ecx, edx uint32)
TEXT ·asmCpuid(SB),7,$0	
	MOVL op+0(FP),AX
	CPUID
	MOVL AX,eax+8(FP)
	MOVL BX,ebx+12(FP)
	MOVL CX,ecx+16(FP)
	MOVL DX,edx+20(FP)
	RET



// func asmCpuidex(op, op2 uint32) (eax, ebx, ecx, edx uint32)
TEXT ·asmCpuidex(SB),7,$0	
	MOVL op+0(FP),AX
	MOVL op2+4(FP),CX
	CPUID
	MOVL AX,eax+8(FP)
	MOVL BX,ebx+12(FP)
	MOVL CX,ecx+16(FP)
	MOVL DX,edx+20(FP)
	RET

// func asmXgetbv(index uint32) (eax, edx uint32)
TEXT ·asmXgetbv(SB),7,$0	
	MOVL index+0(FP),CX
	BYTE $0x0f; BYTE $0x01; BYTE $0xd0  //	XGETBV
	MOVL AX,eax+8(FP)
	MOVL DX,edx+12(FP)
	RET

// func asmRdtscpAsm() (eax, ebx, ecx, edx uint32)
TEXT ·asmRdtscpAsm(SB),7,$0	
	BYTE $0x0F; BYTE $0x01; BYTE $0xF9  // RDTSCP
	MOVL AX,eax+0(FP)
	MOVL BX,ebx+4(FP)
	MOVL CX,ecx+8(FP)
	MOVL DX,edx+12(FP)
	RET