MdePkg/Library/BaseLib/X86FxRestore.c

   1 /** @file
   2   IA-32/x64 AsmFxRestore()
   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   Restores the current floating point/SSE/SSE2 context from a buffer.
  13
  14   Restores the current floating point/SSE/SSE2 state from the buffer specified
  15   by Buffer. Buffer must be aligned on a 16-byte boundary. This function is
  16   only 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   If Buffer was not saved with AsmFxSave(), then ASSERT().
  21
  22   @param  Buffer  A pointer to a buffer to save the floating point/SSE/SSE2 context.
  23
  24 **/
  25 VOID
  26 EFIAPI
  27 AsmFxRestore (
  28   IN      CONST IA32_FX_BUFFER  *Buffer
  29   )
  30 {
  31   ASSERT (Buffer != NULL);
  32   ASSERT (0 == ((UINTN)Buffer & 0xf));
  33
  34   //
  35   // Check the flag recorded by AsmFxSave()
  36   //
  37   ASSERT (0xAA5555AA == *(UINT32 *)(&Buffer->Buffer[sizeof (Buffer->Buffer) - 4]));
  38
  39   InternalX86FxRestore (Buffer);
  40 }