linux-kernel - Re: Need help making sense of IRQ API

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Date:	Fri, 29 Jun 2007 22:49:13 +0200
From:	Michal Schmidt <xschmi00@...d.feec.vutbr.cz>
To:	LOL ER <cryptococa@...il.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Need help making sense of IRQ API

LOL ER wrote:
> Hello,
>   I've been trying to make sense of how the kernel (on an i386) calls
> __do_IRQ() from do_IRQ() for the past few days to no avail. [...]

Since i386 was switched to the generic-IRQ architecture (see "Linux
generic IRQ handling" in Documentation/Docbook) it does not use __do_IRQ().

common_interrupt (in assembler) calls do_IRQ(), which calls
desc->handle_irq() that is usually one of:
 handle_fasteoi_irq()
 handle_level_irq()
 handle_edge_irq()

Michal
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