MdePkg/Library/BaseLib/Ia32/ReadDr1.c

   1 /** @file
   2   AsmReadDr1 function
   3
   4   Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9
  10
  11
  12 /**
  13   Reads the current value of Debug Register 1 (DR1).
  14
  15   Reads and returns the current value of DR1. This function is only available
  16   on IA-32 and x64. This returns a 32-bit value on IA-32 and a 64-bit value on
  17   x64.
  18
  19   @return The value of Debug Register 1 (DR1).
  20
  21 **/
  22 UINTN
  23 EFIAPI
  24 AsmReadDr1 (
  25   VOID
  26   )
  27 {
  28   __asm {
  29     mov     eax, dr1
  30   }
  31 }
  32