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   Module Name:  x86FxSave.c
  14
  15 **/
  16
  17 //
  18 // Include common header file for this module.
  19 //
  20 #include "CommonHeader.h"
  21
  22 #include "BaseLibInternals.h"
  23
  24 /**
  25   Save the current floating point/SSE/SSE2 context to a buffer.
  26
  27   Saves the current floating point/SSE/SSE2 state to the buffer specified by
  28   Buffer. Buffer must be aligned on a 16-byte boundary. This function is only
  29   available on IA-32 and X64.
  30
  31   If Buffer is NULL, then ASSERT().
  32   If Buffer is not aligned on a 16-byte boundary, then ASSERT().
  33
  34   @param  Buffer  Pointer to a buffer to save the floating point/SSE/SSE2 context.
  35
  36 **/
  37 VOID
  38 EFIAPI
  39 AsmFxSave (
  40   OUT     IA32_FX_BUFFER            *Buffer
  41   )
  42 {
  43   ASSERT (Buffer != NULL);
  44   ASSERT (((UINTN)Buffer & 0xf) == 0);
  45
  46   InternalX86FxSave (Buffer);
  47
  48   //
  49   // Mark one flag at end of Buffer, it will be check by AsmFxRestor()
  50   //
  51   *(UINT32 *) (&Buffer[sizeof (IA32_FX_BUFFER) - 4]) = 0xAA5555AA;
  52 }