Date: Mon, 11 Feb 2002 13:41:43 +0000 From: j mckitrick <jcm@FreeBSD-uk.eu.org> To: freebsd-hackers@freebsd.org, freebsd-newbus@freebsd.org Subject: Adding newbus abstraction to parallel port devices Message-ID: <20020211134143.A24762@dogma.freebsd-uk.eu.org>
next in thread | raw e-mail | index | archive | help
Hi all, last time I looked, the parallel port chipset driver (isa/ppc) uses microsequences to handle the hardware control/data ports for the parallel port. For anyone who is unfamiliar with these, they are macros built from I/O port bitmasks to handle the necessary hardware control to run the parallel port. The committer that wrote the parallel port driver said he used microsequences because the driver was designed/implemented before newbus. Since the purpose of the microsequences was (a) hardware abstraction and (b) to increase speed, how could this be re-written to use newbus instead without a performance loss? jm -- My other computer is your windows box. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20020211134143.A24762>