MdePkg/Library/BaseLib/X86FxRestore.c

/** @file
  IA-32/x64 AsmFxRestore()

  Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include "BaseLibInternals.h"

/**
  Restores the current floating point/SSE/SSE2 context from a buffer.

  Restores the current floating point/SSE/SSE2 state from the buffer specified
  by Buffer. Buffer must be aligned on a 16-byte boundary. This function is
  only available on IA-32 and x64.

  If Buffer is NULL, then ASSERT().
  If Buffer is not aligned on a 16-byte boundary, then ASSERT().
  If Buffer was not saved with AsmFxSave(), then ASSERT().

  @param  Buffer  A pointer to a buffer to save the floating point/SSE/SSE2 context.

**/
VOID
EFIAPI
AsmFxRestore (
  IN      CONST IA32_FX_BUFFER  *Buffer
  )
{
  ASSERT (Buffer != NULL);
  ASSERT (0 == ((UINTN)Buffer & 0xf));

  //
  // Check the flag recorded by AsmFxSave()
  //
  ASSERT (0xAA5555AA == *(UINT32 *)(&Buffer->Buffer[sizeof (Buffer->Buffer) - 4]));

  InternalX86FxRestore (Buffer);
}