src/sys/dev/mbox, branch release/13.1.0

src/sys/dev/mbox, branch release/13.1.0 FreeBSD source tree https://cgit-dev.freebsd.org/src/atom?h=release%2F13.1.0 2013-07-07T19:47:22Z Add a mailbox interface. 2013-07-07T19:47:22Z Rui Paulo rpaulo@FreeBSD.org 2013-07-07T19:47:22Z urn:sha1:9a0c3479e22feda1bdb2db4b97f9deb1b5fa6269 Mailboxes are an IPC mechanism found on several ARM architectures, namely OMAP4, BCM2385, Sitara, etc. Reviewed by: gonzo