tree a203b89db17fbeca9e4af828d37a009360b75850
parent 957818b41f7fc6b7d1a090098fbd34722041aba3
author Jeremy Kerr <jk@ozlabs.org> 1457431031 +0800
committer Jeremy Kerr <jk@ozlabs.org> 1457431217 +0800

Split IO handling code into separate handler modules

Currently, we have a direct, explicit link between the VUART IO and the
"outbound" data, currently to stdio.

We'll want to do multiple things with the VUART data in future (eg.,
logging).

This change introduces "handlers"; a struct of callbacks that are
invoked when UART data is available, or when a (handler-provided) poll
descriptor returns new events. We convert the stdio code into a handler
as part of this.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>