x86fxrestore.c

来自「EFI BIOS是Intel提出的下一代的BIOS标准。这里上传的Edk源代码是」· C语言 代码 · 共 55 行

/*++

Copyright (c) 2004 - 2006, Intel Corporation                                                         
All rights reserved. This program and the accompanying materials                          
are licensed and made available under the terms and conditions of the BSD License         
which accompanies this distribution.  The full text of the license may be found at        
http://opensource.org/licenses/bsd-license.php                                            
                                                                                          
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.  


Module Name:

  x86FxRestore.c
  
Abstract: 

  IA-32/x64 specific functions.

--*/

#include "BaseLibInternal.h"

/**
  Restores the current floating point/SSE/SSE2 context from a buffer.

  Restores the current floating point/SSE/SSE2 state from the buffer specified
  by Buffer. Buffer must be aligned on a 16-byte boundary. This function is
  only available on IA-32 and X64.

  If Buffer is NULL, then ASSERT().
  If Buffer is not aligned on a 16-byte boundary, then ASSERT().
  If Buffer was not saved with AsmFxSave(), then ASSERT().

  @param  Buffer  Pointer to a buffer to save the floating point/SSE/SSE2 context.

**/
VOID
EFIAPI
AsmFxRestore (
  IN CONST IA32_FX_BUFFER  *Buffer
  )
{
  ASSERT (Buffer != NULL);
  ASSERT (((UINTN)Buffer & 0xf) == 0);

  //
  // Check the flag recorded by AsmFxSave()
  //
  ASSERT (*(UINT32 *) (&Buffer[sizeof (IA32_FX_BUFFER) - 4]) == 0xAA5555AA);

  InternalX86FxRestore (Buffer);
}