MdePkg/Library/BaseLib/X86FxSave.c

   1 /** @file
   2   IA-32/x64 AsmFxSave()
   3
   4   Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #include "BaseLibInternals.h"
  10
  11 /**
  12   Save the current floating point/SSE/SSE2 context to a buffer.
  13
  14   Saves the current floating point/SSE/SSE2 state to the buffer specified by
  15   Buffer. Buffer must be aligned on a 16-byte boundary. This function is only
  16   available on IA-32 and x64.
  17
  18   If Buffer is NULL, then ASSERT().
  19   If Buffer is not aligned on a 16-byte boundary, then ASSERT().
  20
  21   @param  Buffer  A pointer to a buffer to save the floating point/SSE/SSE2 context.
  22
  23 **/
  24 VOID
  25 EFIAPI
  26 AsmFxSave (
  27   OUT     IA32_FX_BUFFER  *Buffer
  28   )
  29 {
  30   ASSERT (Buffer != NULL);
  31   ASSERT (0 == ((UINTN)Buffer & 0xf));
  32
  33   InternalX86FxSave (Buffer);
  34
  35   //
  36   // Mark one flag at end of Buffer, it will be check by AsmFxRestor()
  37   //
  38   *(UINT32 *)(&Buffer->Buffer[sizeof (Buffer->Buffer) - 4]) = 0xAA5555AA;
  39 }