MdePkg/Library/BaseLib/X86FxRestore.c

   1 /** @file
   2   IA-32/x64 AsmFxRestore()
   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   Restores the current floating point/SSE/SSE2 context from a buffer.
  22
  23   Restores the current floating point/SSE/SSE2 state from the buffer specified
  24   by Buffer. Buffer must be aligned on a 16-byte boundary. This function is
  25   only 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   If Buffer was not saved with AsmFxSave(), then ASSERT().
  30
  31   @param  Buffer  Pointer to a buffer to save the floating point/SSE/SSE2 context.
  32
  33 **/
  34 VOID
  35 EFIAPI
  36 AsmFxRestore (
  37   IN      CONST IA32_FX_BUFFER      *Buffer
  38   )
  39 {
  40   ASSERT (Buffer != NULL);
  41   ASSERT (0 == ((UINTN)Buffer & 0xf));
  42
  43   //
  44   // Check the flag recorded by AsmFxSave()
  45   //
  46   ASSERT (0xAA5555AA == *(UINT32 *) (&Buffer[sizeof (IA32_FX_BUFFER) - 4]));
  47
  48   InternalX86FxRestore (Buffer);
  49 }