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[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / WriteDr0.c

/** @file\r
  AsmWriteDr0 function\r
\r
  Copyright (c) 2006 - 2007, Intel Corporation<BR>\r
  All rights reserved. This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
\r
\r
\r
/**\r
  Writes a value to Debug Register 0 (DR0).\r
\r
  Writes and returns a new value to DR0. This function is only available on\r
  IA-32 and X64. This writes a 32-bit value on IA-32 and a 64-bit value on X64.\r
\r
  @param  Dr0 The value to write to Dr0.\r
\r
  @return The value written to Debug Register 0 (DR0).\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmWriteDr0 (\r
  IN UINTN Value\r
  )\r
{\r
  _asm {\r
    mov     eax, Value\r
    mov     dr0, eax\r
  }\r
}\r
\r