About interrupt handler

[cheneydeng]

Thanks to all of you~


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best regards！
  cheneydeng
 

 
 
 
------------------ Original ------------------
From:  "Zhengwang Ruan"<ruan.zhengwang at gmail.com>;
Date:  Thu, Feb 23, 2012 06:07 PM
To:  "kernelnewbies"<kernelnewbies at kernelnewbies.org>; 

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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