From: Steven Rostedt <rostedt@goodmis.org>
To: 7eggert@gmx.de
Cc: linux-kernel@vger.kernel.org, Ukil a <ukil_a@yahoo.com>
Subject: Re: Need help in understanding x86 syscall
Date: Thu, 11 Aug 2005 10:05:39 -0400 [thread overview]
Message-ID: <1123769139.17269.50.camel@localhost.localdomain> (raw)
In-Reply-To: <E1E3DJm-0000jy-0B@be1.lrz>
On Thu, 2005-08-11 at 15:41 +0200, Bodo Eggert wrote:
> According to my documentation it isn't. A software interrupt is a far call
> with an extra pushf, and a hardware interrupt is protected against recursion
> by the PIC, not by an interrupt flag.
I disagree with your definition of a system call. The "int 0x80"
changes from user mode to kernel mode so it is much more powerful than a
"far call". Also the CPU does protect against recursion and more than
one interrupt coming in at the same time. The PIC also works with the
CPU in this regard, but as I shown in my previous email, the interrupt
flag _does_ protect against it.
-- Steve
next prev parent reply other threads:[~2005-08-11 14:05 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4Ae73-6Mm-5@gated-at.bofh.it>
2005-08-11 13:41 ` Need help in understanding x86 syscall Bodo Eggert
2005-08-11 14:04 ` linux-os (Dick Johnson)
2005-08-11 14:31 ` Steven Rostedt
2005-08-11 15:13 ` Coywolf Qi Hunt
2005-08-11 15:22 ` Steven Rostedt
2005-08-11 15:28 ` linux-os (Dick Johnson)
2005-08-11 15:51 ` Steven Rostedt
2005-08-11 16:19 ` Steven Rostedt
2005-08-11 16:31 ` Coywolf Qi Hunt
2005-08-11 16:59 ` Coywolf Qi Hunt
2005-08-11 17:10 ` linux-os (Dick Johnson)
2005-08-11 17:26 ` Steven Rostedt
2005-08-11 17:33 ` Steven Rostedt
2005-08-11 17:57 ` linux-os (Dick Johnson)
2005-08-11 17:59 ` Zachary Amsden
2005-08-11 18:17 ` Steven Rostedt
2005-08-11 19:58 ` Zachary Amsden
2005-08-11 20:04 ` Steven Rostedt
2005-08-12 19:30 ` Jan Engelhardt
2005-08-11 17:46 ` linux-os (Dick Johnson)
2005-08-11 18:11 ` Steven Rostedt
2005-08-11 18:21 ` linux-os (Dick Johnson)
2005-08-11 19:00 ` Steven Rostedt
2005-08-11 20:39 ` Zwane Mwaikambo
2005-08-12 11:29 ` Bodo Eggert
2005-08-11 17:18 ` Steven Rostedt
2005-08-12 5:04 ` Jeff Carr
2005-08-12 5:30 ` Coywolf Qi Hunt
2005-08-12 10:34 ` Steven Rostedt
2005-08-12 10:40 ` Steven Rostedt
2005-08-11 14:05 ` Steven Rostedt [this message]
2005-08-11 23:25 ` Bodo Eggert
2005-08-11 5:39 Ukil a
2005-08-11 13:54 ` Steven Rostedt
2005-08-11 15:52 ` Zachary Amsden
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