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From: gardos@kodak.UUCP (tom gardos)
Newsgroups: net.unix-wizards
Subject: assembler "out" in IBM XENIX
Message-ID: <292@kodak.UUCP>
Date: Mon, 7-Apr-86 13:53:46 EST
Article-I.D.: kodak.292
Posted: Mon Apr  7 13:53:46 1986
Date-Received: Thu, 10-Apr-86 00:32:50 EST
Reply-To: gardos@kodak.UUCP (tom gardos)
Organization: Eastman Kodak Co., Rochester, NY
Lines: 24
Keywords: XENIX, out, I/O, Device Driver


I am writing a device driver for the IBM XENIX operating system. The device
driver calls an assembler routine. The assembler routine sends data to
an I/O port using the following form:

	mov	dx, PORT_ADDRESS
	mov	ax, DATA_VALUE
	out	dx,ax

However, upon execution the system crashes and the following message appears
on the console:

TRAP 000D in SYSTEM
(registers are dumped here)
panic: general protection trap

Any ideas as to what is causing this error? It has me stumped.

Thanks, 

	Tom Gardos, MPAVD, Eastman Kodak Co.

-- 
Tom Gardos