From PhoenixWiki

Macro for outputting messages in the debug-build versions of drivers.

Prototype

#ifdef EFI_DEBUG
  ...
  #define DEBUG(arg)        EfiDebugPrint arg
  ...
#else
  ...
  #define DEBUG(arg)
#endif

Parameters

Parameter	Description
ErrorLevel	Specifies the severity and class of error. See EFI_DEBUG_MASK_PROTOCOL for a definition of the error levels and classes.
Format	printf-style debug string.
...	Other parameters

Description

In the debug builds, display the printf-style message to the StdErr.

The parameters should be enclosed in parentheses: DEBUG((EFI_D_INFO|EFI_D_LOAD,...))

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Copyright (C) 2008 Phoenix Technologies Ltd. All Rights Reserved. Portions copyright (C) 2004 Intel Corporation. Used with permission.