MdePkg/Library/BaseLib/x86FxSave.c

   1 /** @file
   2   IA-32/x64 AsmFxSave()
   3
   4   Copyright (c) 2006, 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 #include "BaseLibInternals.h"
  21
  22 /**
  23   Save the current floating point/SSE/SSE2 context to a buffer.
  24
  25   Saves the current floating point/SSE/SSE2 state to the buffer specified by
  26   Buffer. Buffer must be aligned on a 16-byte boundary. This function is only
  27   available on IA-32 and X64.
  28
  29   If Buffer is NULL, then ASSERT().
  30   If Buffer is not aligned on a 16-byte boundary, then ASSERT().
  31
  32   @param  Buffer  Pointer to a buffer to save the floating point/SSE/SSE2 context.
  33
  34 **/
  35 VOID
  36 EFIAPI
  37 AsmFxSave (
  38   OUT     IA32_FX_BUFFER            *Buffer
  39   )
  40 {
  41   ASSERT (Buffer != NULL);
  42   ASSERT (0 == ((UINTN)Buffer & 0xf));
  43
  44   InternalX86FxSave (Buffer);
  45
  46   //
  47   // Mark one flag at end of Buffer, it will be check by AsmFxRestor()
  48   //
  49   *(UINT32 *) (&Buffer[sizeof (IA32_FX_BUFFER) - 4]) = 0xAA5555AA;
  50 }