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 **/
  14
  15 //
  16 // Include common header file for this module.
  17 //
  18
  19
  20 #include "BaseLibInternals.h"
  21
  22 /**
  23   Restores the current floating point/SSE/SSE2 context from a buffer.
  24
  25   Restores the current floating point/SSE/SSE2 state from the buffer specified
  26   by Buffer. Buffer must be aligned on a 16-byte boundary. This function is
  27   only 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   If Buffer was not saved with AsmFxSave(), then ASSERT().
  32
  33   @param  Buffer  Pointer to a buffer to save the floating point/SSE/SSE2 context.
  34
  35 **/
  36 VOID
  37 EFIAPI
  38 AsmFxRestore (
  39   IN CONST IA32_FX_BUFFER  *Buffer
  40   )
  41 {
  42   ASSERT (Buffer != NULL);
  43   ASSERT (0 == ((UINTN)Buffer & 0xf));
  44
  45   //
  46   // Check the flag recorded by AsmFxSave()
  47   //
  48   ASSERT (0xAA5555AA == *(UINT32 *) (&Buffer[sizeof (IA32_FX_BUFFER) - 4]));
  49
  50   InternalX86FxRestore (Buffer);
  51 }