mask out an irq line
hi all, I know that when an interrupt handler is excuting, the irq line which generated the signal will be masked out,however,if the line is shared by many device.Will all be masked out or just the one which is handling now be masked out ?Doed it tell the difference by the forth argument of request_irq() ? -- best regards！ cheneydeng___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: About interrupt handler
Thanks to all of you~
--
best regards！
cheneydeng
-- Original --
From: "Zhengwang Ruan";
Date: Thu, Feb 23, 2012 06:07 PM
To: "kernelnewbies";
Subject: Re: About interrupt handler
Original Message ----
From: cheneydeng
Sent: 2012年02月22日 星期三 23时38分37秒
To: kernelnewbies
Subject: About interrupt handler
hi all,
I'm begin to learn the Kernel and i'm reading <>.It says "This is an important point, always keep
in mind that all interrupt handler has interrupted other
code(possibly even another interrupt handler on a different
line)".What i am not able to understand is how a interrupt handler be
interrupted ? DID NOT it uninterrupted?
It has more related to CPU architecture. Generally, while an interrupt
handler is being executed, the handler itself can chose to disable or
enable external interrupts (i.e, take x86 for example, IF bit for cflags
reg controls this.). If IF is enabled, then the interrupt handler currently
being executed may be interrupted and then jump to the entry for the coming
interrupt.
Thanks,
-Zhengwang
--
best regards！
cheneydeng
___ Kernelnewbies mailing
list Kernelnewbies@kernelnewbies.org
http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies___
Kernelnewbies mailing list
Kernelnewbies@kernelnewbies.org
http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
About interrupt handler
hi all, I'm begin to learn the Kernel and i'm reading <>.It says "This is an important point, always keep in mind that all interrupt handler has interrupted other code(possibly even another interrupt handler on a different line)".What i am not able to understand is how a interrupt handler be interrupted ? DID NOT it uninterrupted? -- best regards！ cheneydeng___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
About interrupt handler
hi all, I'm begin to learn the Kernel and i'm reading <>.It says "This is an important point, always keep in mind that all interrupt handler has interrupted other code(possibly even another interrupt handler on a different line)".What i am not able to understand is how a interrupt handler be interrupted ? DID NOT it uninterrupted? -- best regards！ cheneydeng___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
