Date: Wed, 02 Dec 1998 17:00:07 -0800 From: Mike Smith <mike@smith.net.au> To: zhihuizhang <bf20761@binghamton.edu> Cc: hackers <freebsd-hackers@FreeBSD.ORG> Subject: Re: Interrupt handler and interrupt unit? Message-ID: <199812030100.RAA01131@dingo.cdrom.com> In-Reply-To: Your message of "Wed, 02 Dec 1998 11:19:03 EST." <Pine.SOL.L3.93.981202110449.23068A-100000@bingsun2>
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> > In the source code isa.c, I find the definition of intr_unit[]. I have no > idea what is an interrupt unit and how it is used. Maybe it refers to one > of several device units connected by a single controller and that > controller is assigned one IRQ by OS or hardware jumpers? It's the saved unit number that's passed to the interrupt handler when invoked. > Also, I want to know what specific information is passed to the system > when an interrupt occurs. I read in a book on device driver, it only says > this is OS and hardware dependent. Which part of the system? The general practice is that the hardware ultimately forwards an identifier for the interrupt number; everything else is determined from that. -- \\ Sometimes you're ahead, \\ Mike Smith \\ sometimes you're behind. \\ mike@smith.net.au \\ The race is long, and in the \\ msmith@freebsd.org \\ end it's only with yourself. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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