1 ;------------------------------------------------------------------------------ 2 ; 3 ; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR> 4 ; This program and the accompanying materials 5 ; are licensed and made available under the terms and conditions of the BSD License 6 ; which accompanies this distribution. The full text of the license may be found at 7 ; http://opensource.org/licenses/bsd-license.php. 8 ; 9 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 10 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 11 ; 12 ; Module Name: 13 ; 14 ; WriteMsr64.Asm 15 ; 16 ; Abstract: 17 ; 18 ; AsmWriteMsr64 function 19 ; 20 ; Notes: 21 ; 22 ;------------------------------------------------------------------------------ 23 24 .code 25 26 ;------------------------------------------------------------------------------ 27 ; UINT64 28 ; EFIAPI 29 ; AsmWriteMsr64 ( 30 ; IN UINT32 Index, 31 ; IN UINT64 Value 32 ; ); 33 ;------------------------------------------------------------------------------ 34 AsmWriteMsr64 PROC 35 mov rax, rdx ; meanwhile, rax <- return value 36 shr rdx, 20h ; edx:eax contains the value to write 37 wrmsr 38 ret 39 AsmWriteMsr64 ENDP 40 41 END 42
