From mboxrd@z Thu Jan 1 00:00:00 1970 From: Richard Subject: console driver - How domain0 processes console messages ? Date: Wed, 16 Feb 2005 01:10:26 -0500 Message-ID: Reply-To: Richard Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: xen-devel-admin@lists.sourceforge.net Errors-To: xen-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: xen-devel@lists.sourceforge.net List-Id: xen-devel@lists.xenproject.org Hello, I am trying to undestand how the console driver works. The files of interests are: 1.) drivers/xen/console/console.c 2.) arch/xen/kernel/ctrl_if.c That is what I undestand so far. When an unpriveleged domain (say domain1) wants to write to the console, the following happens: 1.) A function like kcons_write() is invoked to write the string to a buffer "wbuf". 2.) Function __xencons_tx_flush() is called to packet the characters in the buffer "wbuf" into messages of type "ctrl_msg_t". 3.) A function like ctrl_if_send_message_noblock() is then called to place the messages "ctrl_msg_t" into the communication ring that is shared between dom1 and dom0. 4.) Function ctrl_if_notify_controller() is then called to send an event notification to domain0 Steps 1 to 4 occur in domain1 (the unprivileged domain). Now at the over end of the event channel, I am trying to figure out where in domain0 the event notification is being received and how it is being processed. I am trying to undestand how domain0 processes console messages (i.e messages with type CMSG_CONSOLE and subtype CMSG_CONSOLE_DATA). Thanks Richard ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click