Hi,
Some further questions on the same issue. At the time of kernel
initialization, we have several set_trap_gate() and set_system_gate()
function calls. As i understand, in case of x86, each of these shall install
an entry in the Interrupt Descriptor Table at a particular index.
When the same interrupt occurs, the entry in IDT shall provide the Segment
Selector and the offset in the segment, at which the interrupt handler code
can be found.
If the above understanding is correct, what role do the multiple ENTRY()
linker script directives have to play in entry.S?
Regards,
Shyamal
On Tue, Apr 22, 2008 at 7:15 AM, Mulyadi Santosa <[EMAIL PROTECTED]>
wrote:
> Hi
> On Mon, Apr 21, 2008 at 3:58 PM, Shyamal Shukla <[EMAIL PROTECTED]>
> wrote:
> > Hi Mulyadi,
> >
> > I saw a post initiated by you regarding the entry.S file
> >
> > http://mail.nl.linux.org/kernelnewbies/2005-11/msg00161.html
>
> Ahhhh :)
>
> > I am stuck with the same doubt (the need for multiple entry points and
> when
> > and how will each one of them be activated).
>
> Short answer to trigger your own further research: because x86...and
> so do many other processor's architectures...provide so many
> interrupts, trap and exceptions. Each of them needs to be handled
> properly.
>
> Think about division by zero, segmentation fault and so on...
>
> > Some detailed explanation or pointers, shall be of great help.
>
> I think LDD3 will provide you better background here... or buy a copy
> of Understanding of Linux Kernel 3rd ed.
>
> regards,
>
> Mulyadi.
>
--
Linux - because life is too short for reboots...
