MdePkg/Library/BaseLib/Ia32/ReadEflags.c

   1 /** @file
   2   AsmReadEflags function
   3
   4   Copyright (c) 2006 - 2007, Intel Corporation<BR>
   5   All rights reserved. This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 //
  16 // Include common header file for this module.
  17 //
  18
  19
  20 /**
  21   Reads the current value of the EFLAGS register.
  22
  23   Reads and returns the current value of the EFLAGS register. This function is
  24   only available on IA-32 and X64. This returns a 32-bit value on IA-32 and a
  25   64-bit value on X64.
  26
  27   @return EFLAGS on IA-32 or RFLAGS on X64.
  28
  29 **/
  30 UINTN
  31 EFIAPI
  32 AsmReadEflags (
  33   VOID
  34   )
  35 {
  36   __asm {
  37     pushfd
  38     pop     eax
  39   }
  40 }
  41