Hi Thomas,
Thank you for your quick reply.
who does the processor switch ? Is it done by hardware or by kernel ?
Again, if the interrupt is generated by "int" instruction by a
user process, then how it is
handled ?
Thanking you,
Roushan
On 11/30/05, Thomas Petazzoni <thomas.petazzoni@xxxxxxxx> wrote:
> Hi,
>
> Roushan Ali wrote:
>
> > "How the check for authirized source of an interrupt is done in
> > linux ? If it is done by comparing the CPL with the DPL of IDT or
> > GDT , then if a hardware interrupt comes while the CPU is executing a
> > process in user mode(CPL = 3), so how does the CPU decide whether to
> > handle the interrupt or not ?"
>
> The processor switches to the priviledge level needed by the interrupt
> handler (generally priviledge 0), and executes the interrupt handler in
> that priviledge level.
>
> Sincerly,
>
> Thomas
> --
> Thomas Petazzoni
> thomas.petazzoni@xxxxxxxx
>
--
Md. Roushan Ali
Verismo Networks Pvt. Ltd.
Email: roushan1981@xxxxxxxxxxx
Mobile : +919886360098
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