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
  10
  11
  12 #include "BaseLibInternals.h"
  13
  14 /**
  15   Save the current floating point/SSE/SSE2 context to a buffer.
  16
  17   Saves the current floating point/SSE/SSE2 state to the buffer specified by
  18   Buffer. Buffer must be aligned on a 16-byte boundary. This function is only
  19   available on IA-32 and x64.
  20
  21   If Buffer is NULL, then ASSERT().
  22   If Buffer is not aligned on a 16-byte boundary, then ASSERT().
  23
  24   @param  Buffer  A pointer to a buffer to save the floating point/SSE/SSE2 context.
  25
  26 **/
  27 VOID
  28 EFIAPI
  29 AsmFxSave (
  30   OUT     IA32_FX_BUFFER            *Buffer
  31   )
  32 {
  33   ASSERT (Buffer != NULL);
  34   ASSERT (0 == ((UINTN)Buffer & 0xf));
  35
  36   InternalX86FxSave (Buffer);
  37
  38   //
  39   // Mark one flag at end of Buffer, it will be check by AsmFxRestor()
  40   //
  41   *(UINT32 *) (&Buffer->Buffer[sizeof (Buffer->Buffer) - 4]) = 0xAA5555AA;
  42 }