MdePkg/Library/BaseLib/x86FxRestore.c

   1 /** @file
   2   IA-32/x64 AsmFxRestore()
   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:  x86FxRestore.c
  14
  15 **/
  16
  17 #include "BaseLibInternals.h"
  18
  19 /**
  20   Restores the current floating point/SSE/SSE2 context from a buffer.
  21
  22   Restores the current floating point/SSE/SSE2 state from the buffer specified
  23   by Buffer. Buffer must be aligned on a 16-byte boundary. This function is
  24   only 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   If Buffer was not saved with AsmFxSave(), 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 AsmFxRestore (
  36   IN CONST IA32_FX_BUFFER  *Buffer
  37   )
  38 {
  39   ASSERT (Buffer != NULL);
  40   ASSERT (((UINTN)Buffer & 0xf) == 0);
  41
  42   //
  43   // Check the flag recorded by AsmFxSave()
  44   //
  45   ASSERT (*(UINT32 *) (&Buffer[sizeof (IA32_FX_BUFFER) - 4]) == 0xAA5555AA);
  46
  47   InternalX86FxRestore (Buffer);
  48 }