EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/X86FxRestore.c

   1 /*++
   2
   3 Copyright (c) 2004 - 2006, Intel Corporation. All rights reserved.<BR>
   4 This program and the accompanying materials
   5 are licensed and made available under the terms and conditions of the BSD License
   6 which accompanies this distribution.  The full text of the license may be found at
   7 http://opensource.org/licenses/bsd-license.php
   8
   9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11
  12
  13 Module Name:
  14
  15   x86FxRestore.c
  16
  17 Abstract:
  18
  19   IA-32/x64 specific functions.
  20
  21 --*/
  22
  23 #include "BaseLibInternals.h"
  24
  25 /**
  26   Restores the current floating point/SSE/SSE2 context from a buffer.
  27
  28   Restores the current floating point/SSE/SSE2 state from the buffer specified
  29   by Buffer. Buffer must be aligned on a 16-byte boundary. This function is
  30   only available on IA-32 and X64.
  31
  32   If Buffer is NULL, then ASSERT().
  33   If Buffer is not aligned on a 16-byte boundary, then ASSERT().
  34   If Buffer was not saved with AsmFxSave(), then ASSERT().
  35
  36   @param  Buffer  Pointer to a buffer to save the floating point/SSE/SSE2 context.
  37
  38 **/
  39 VOID
  40 EFIAPI
  41 AsmFxRestore (
  42   IN CONST IA32_FX_BUFFER  *Buffer
  43   )
  44 {
  45   ASSERT (Buffer != NULL);
  46   ASSERT (((UINTN)Buffer & 0xf) == 0);
  47
  48   //
  49   // Check the flag recorded by AsmFxSave()
  50   //
  51   ASSERT (*(UINT32 *) (&Buffer[sizeof (IA32_FX_BUFFER) - 4]) == 0xAA5555AA);
  52
  53   InternalX86FxRestore (Buffer);
  54 }