From mboxrd@z Thu Jan 1 00:00:00 1970 From: ruan.zhengwang@gmail.com (Zhengwang Ruan) Date: Thu, 23 Feb 2012 18:07:22 +0800 Subject: About interrupt handler In-Reply-To: References: Message-ID: <4F460FDA.1010100@gmail.com> To: kernelnewbies@lists.kernelnewbies.org List-Id: kernelnewbies.lists.kernelnewbies.org -------- Original Message -------- From: cheneydeng Sent: 2012?02?22? ??? 23?38?37? To: kernelnewbies Subject: About interrupt handler > hi all, > I'm begin to learn the Kernel and i'm reading < 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 > > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies at kernelnewbies.org > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20120223/ff4def83/attachment-0001.html