Thanks to all of you~
------------------
best regards！
cheneydeng
------------------ Original ------------------
From: "Zhengwang Ruan"<[email protected]>;
Date: Thu, Feb 23, 2012 06:07 PM
To: "kernelnewbies"<[email protected]>;
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 <<Linux
kernel development>>.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
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