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From: gemini@homxb.UUCP (Rick Richardson)
Newsgroups: net.unix,net.unix-wizards,net.micro.pc
Subject: Re: XENIX assmblr OUT - Device Driver
Message-ID: <1422@homxb.UUCP>
Date: Fri, 11-Apr-86 08:19:23 EST
Article-I.D.: homxb.1422
Posted: Fri Apr 11 08:19:23 1986
Date-Received: Mon, 14-Apr-86 05:43:27 EST
References: <298@kodak.UUCP>
Organization: PC Research, Inc.
Lines: 15
Keywords: out, in, I/O, XENIX device driver, assembler
Xref: watmath net.unix:7613 net.unix-wizards:17560 net.micro.pc:7768

[Trying to use in/out in assembler from a XENIX device driver, stills
gets TRAP]

	I don't know for sure about XENIX, but VENIX/286 provides
C callable (from the driver) routines that do IN/OUT for you.  They
are io_in[bw](port) and io_out[bw](port, val).  I would be surprised
if XENIX didn't also provide the same sort of thing.  As for directly
using the IN/OUT instructions from assembler in a driver, that also
works under VENIX/286, with no extra shenanigans.

BTW, the only driver in VENIX/286 that has a portion written in assembler
is the console driver.  All the rest are completly C.

Rick Richardson, PC Research, Inc. (201) 922-1134, (201) 834-1378 @ AT&T-CP
..!ihnp4!castor!{rer,pcrat!rer} <--Replies to here, not to homxb!gemini, please.