MdePkg: Replace BSD License with BSD+Patent License

[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / WriteMsr64.c

/** @file\r
  AsmWriteMsr64 function\r
\r
  Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
\r
\r
\r
/**\r
  Writes a 64-bit value to a Machine Specific Register(MSR), and returns the\r
  value.\r
\r
  Writes the 64-bit value specified by Value to the MSR specified by Index. The\r
  64-bit value written to the MSR is returned. No parameter checking is\r
  performed on Index or Value, and some of these may cause CPU exceptions. The\r
  caller must either guarantee that Index and Value are valid, or the caller\r
  must establish proper exception handlers. This function is only available on\r
  IA-32 and x64.\r
\r
  @param  Index The 32-bit MSR index to write.\r
  @param  Value The 64-bit value to write to the MSR.\r
\r
  @return Value\r
\r
**/\r
UINT64\r
EFIAPI\r
AsmWriteMsr64 (\r
  IN UINT32  Index,\r
  IN UINT64  Value\r
  )\r
{\r
  _asm {\r
    mov     edx, dword ptr [Value + 4]\r
    mov     eax, dword ptr [Value + 0]\r
    mov     ecx, Index\r
    wrmsr\r
  }\r
}\r
\r