QemuFwCfgSec.c

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#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/QemuFwCfgLib.h>
 
#include "QemuFwCfgLibInternal.h"
 
BOOLEAN
EFIAPI
QemuFwCfgIsAvailable (
  VOID
  )
{
  UINT32  Signature;
  UINT32  Revision;
 
  QemuFwCfgSelectItem (QemuFwCfgItemSignature);
  Signature = QemuFwCfgRead32 ();
  DEBUG ((DEBUG_INFO, "FW CFG Signature: 0x%x\n", Signature));
  QemuFwCfgSelectItem (QemuFwCfgItemInterfaceVersion);
  Revision = QemuFwCfgRead32 ();
  DEBUG ((DEBUG_INFO, "FW CFG Revision: 0x%x\n", Revision));
  if ((Signature != SIGNATURE_32 ('Q', 'E', 'M', 'U')) ||
      (Revision < 1)
      )
  {
    DEBUG ((DEBUG_INFO, "QemuFwCfg interface not supported.\n"));
    return FALSE;
  }
 
  DEBUG ((DEBUG_INFO, "QemuFwCfg interface is supported.\n"));
  return TRUE;
}
 
BOOLEAN
InternalQemuFwCfgIsAvailable (
  VOID
  )
{
  //
  // We always return TRUE, because the consumer of this library ought to have
  // called QemuFwCfgIsAvailable before making other calls which would hit this
  // path.
  //
  return TRUE;
}
 
BOOLEAN
InternalQemuFwCfgDmaIsAvailable (
  VOID
  )
{
  return FALSE;
}
 
VOID
InternalQemuFwCfgDmaBytes (
  IN     UINT32  Size,
  IN OUT VOID    *Buffer OPTIONAL,
  IN     UINT32  Control
  )
{
  //
  // We should never reach here
  //
  ASSERT (FALSE);
  CpuDeadLoop ();
}