http://wiki.osdev.org/Interrupt_Descriptor_Table
The above link gives an explanation of the various fields in the IDT structure and the Gate entry structure (x86). On Sun, Sep 19, 2010 at 4:49 AM, Sri Ram Vemulpali <[email protected]>wrote: > Hi all, > > This question is regarding Interrupt descriptor table. Why is the IDTR > 48-bits wide and why do we need limit field in the IDTR. > Since we know there are 256 interrupts or exceptions possible, can't we > know boundary by deriving it by length of IDT field. > Also, why is the IDT entry is 8 bytes long. And how is the interrupt > line sharing is provided. Is sharing provided at OS code level. > I did not see any explanation of sharing at Intel manual (data sheet of > x86 system programming guide). Any thoughts. > > Please clarify. Thanks. > > > -- > Regards, > Sri. > > -- /manohar
