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Michael Brown 6e1ce52d14 [debug] Allow debug messages to be initially disabled at runtime 
Extend the DEBUG=... syntax to allow debug messages to be compiled in
but disabled by default.  For example:

  make bin/undionly.kpxe DEBUG=netdevice:3:1

would compile in the messages as for DEBUG=netdevice:3, but would set
the debug level mask so that only the DEBUG=netdevice:1 messages would
be displayed.

This allows for external code to selectively enable the additional
debug messages at runtime, without being overwhelmed by unwanted
initial noise.  For example, a developer of a new protocol may want to
temporarily enable tracing of all packets received: this can be done
by building with DEBUG=netdevice:3:1 and using

  // temporarily enable per-packet messages
  DBG_ENABLE_OBJECT ( netdevice, DBGLVL_EXTRA );
  ...
  // disable per-packet messages
  DBG_DISABLE_OBJECT ( netdevice, DBGLVL_EXTRA );

Note that unlike the usual DBG_ENABLE() and DBG_DISABLE() macros,
DBG_ENABLE_OBJECT() and DBG_DISABLE_OBJECT() will not be removed via
dead code elimination if debugging is disabled in the specified
object.  In particular, this means that using either of these macros
will always result in a symbol reference to the specified object.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
 		2016-07-05 12:34:15 +01:00
contrib [errdb] Strip platform error code for non-platform-generated errors 2013-04-29 15:36:32 +01:00
src [debug] Allow debug messages to be initially disabled at runtime 2016-07-05 12:34:15 +01:00
COPYING [legal] Update GPLv2 licence text 2015-02-26 17:59:53 +00:00
COPYING.GPLv2 [legal] Update GPLv2 licence text 2015-02-26 17:59:53 +00:00
COPYING.UBDL [legal] Add support for the Unmodified Binary Distribution Licence 2015-03-02 12:07:14 +00:00
README [doc] Re-add README file 2010-05-28 00:03:47 +01:00

README 

iPXE README File

Quick start guide:

   cd src
   make

For any more detailed instructions, see http://ipxe.org