MdePkg/Library/BaseLib/X86FxSave.c

   1 /** @file
   2   IA-32/x64 AsmFxSave()
   3
   4   Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
   5   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
  17
  18 #include "BaseLibInternals.h"
  19
  20 /**
  21   Save the current floating point/SSE/SSE2 context to a buffer.
  22
  23   Saves the current floating point/SSE/SSE2 state to the buffer specified by
  24   Buffer. Buffer must be aligned on a 16-byte boundary. This function is only
  25   available on IA-32 and x64.
  26
  27   If Buffer is NULL, then ASSERT().
  28   If Buffer is not aligned on a 16-byte boundary, then ASSERT().
  29
  30   @param  Buffer  Pointer to a buffer to save the floating point/SSE/SSE2 context.
  31
  32 **/
  33 VOID
  34 EFIAPI
  35 AsmFxSave (
  36   OUT     IA32_FX_BUFFER            *Buffer
  37   )
  38 {
  39   ASSERT (Buffer != NULL);
  40   ASSERT (0 == ((UINTN)Buffer & 0xf));
  41
  42   InternalX86FxSave (Buffer);
  43
  44   //
  45   // Mark one flag at end of Buffer, it will be check by AsmFxRestor()
  46   //
  47   *(UINT32 *) (&Buffer[sizeof (IA32_FX_BUFFER) - 4]) = 0xAA5555AA;
  48 }