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