EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/X86FxSave.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   x86FxSave.c
  16
  17 Abstract:
  18
  19   IA-32/x64 specific functions.
  20
  21 --*/
  22
  23 #include "BaseLibInternals.h"
  24
  25 /**
  26   Save the current floating point/SSE/SSE2 context to a buffer.
  27
  28   Saves the current floating point/SSE/SSE2 state to the buffer specified by
  29   Buffer. Buffer must be aligned on a 16-byte boundary. This function is only
  30   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
  35   @param  Buffer  Pointer to a buffer to save the floating point/SSE/SSE2 context.
  36
  37 **/
  38 VOID
  39 EFIAPI
  40 AsmFxSave (
  41   OUT     IA32_FX_BUFFER            *Buffer
  42   )
  43 {
  44   ASSERT (Buffer != NULL);
  45   ASSERT (((UINTN)Buffer & 0xf) == 0);
  46
  47   InternalX86FxSave (Buffer);
  48
  49   //
  50   // Mark one flag at end of Buffer, it will be check by AsmFxRestor()
  51   //
  52   *(UINT32 *) (&Buffer[sizeof (IA32_FX_BUFFER) - 4]) = 0xAA5555AA;
  53 }