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Date: Fri, 12 Aug 2005 13:29:35 +0200 (CEST)
From: Bodo Eggert <7eggert@gmx.de>
To: Zwane Mwaikambo <zwane@arm.linux.org.uk>
cc: Steven Rostedt <rostedt@goodmis.org>,
       "linux-os (Dick Johnson)" <linux-os@analogic.com>,
       Coywolf Qi Hunt <coywolf@gmail.com>, 7eggert@gmx.de,
       Ukil a <ukil_a@yahoo.com>, linux-kernel@vger.kernel.org
Subject: Re: Need help in understanding x86 syscall
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On Thu, 11 Aug 2005, Zwane Mwaikambo wrote:
> On Thu, 11 Aug 2005, Steven Rostedt wrote:
> > On Thu, 2005-08-11 at 13:46 -0400, linux-os (Dick Johnson) wrote:

> > int is a call to either an interrupt or exception procedure. 0x80 is
> > setup in Linux to be a trap and not an interrupt vector. So it does
> > _not_ turn off interrupts.
> 
> It's actually a vector, that's all you can install in the IDT.

It's a vector + metadata, most noticably a privilege level and a
descriptor type.

http://www.acm.uiuc.edu/sigops/roll_your_own/i386/idt.html

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