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 DEFAULT REL 25 SECTION .text 26 27 ;------------------------------------------------------------------------------ 28 ; UINT64 29 ; EFIAPI 30 ; AsmWriteMsr64 ( 31 ; IN UINT32 Index, 32 ; IN UINT64 Value 33 ; ); 34 ;------------------------------------------------------------------------------ 35 global ASM_PFX(AsmWriteMsr64) 36 ASM_PFX(AsmWriteMsr64): 37 mov rax, rdx ; meanwhile, rax <- return value 38 shr rdx, 0x20 ; edx:eax contains the value to write 39 wrmsr 40 ret 41 42
