* What does irq_canonicalize mean?
@ 2007-07-23 13:12 jidong xiao
2007-07-23 13:46 ` Alan Cox
0 siblings, 1 reply; 2+ messages in thread
From: jidong xiao @ 2007-07-23 13:12 UTC (permalink / raw)
To: linux-kernel
I found this function, inside include/asm-i386/irq.h or
include/asm-x86_64/irq.h,
static __inline__ int irq_canonicalize(int irq)
{
return ((irq == 2) ? 9 : irq);
}
there is no comments,so I am totally confused what does this function
mean, why there is a "2", and why there is a "9"?
Thanks
Jason Xiao
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: What does irq_canonicalize mean?
2007-07-23 13:12 What does irq_canonicalize mean? jidong xiao
@ 2007-07-23 13:46 ` Alan Cox
0 siblings, 0 replies; 2+ messages in thread
From: Alan Cox @ 2007-07-23 13:46 UTC (permalink / raw)
To: jidong xiao; +Cc: linux-kernel
On Mon, 23 Jul 2007 21:12:22 +0800
"jidong xiao" <jidong.xiao@gmail.com> wrote:
> I found this function, inside include/asm-i386/irq.h or
> include/asm-x86_64/irq.h,
ISA bus interrupt 2 is remapped to 9 on 16bit PC ISA bus platforms. Thus
the user idea of "IRQ 2" is different to the hardware one
^ permalink raw reply [flat|nested] 2+ messages in thread
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