On 9/4/06, Rajat Jain <rajat.noida.india@xxxxxxxxx> wrote:
On 9/4/06, pandari kashyap <pandari.kashyap@xxxxxxxxx > wrote:
> Hello Newbies,
>
> I wanted to know whether Kernel maintains a kernel mode stack for each user
> process? or does it maintain one kernel mode stack for all user processes?.
> Where exactly in memory is this stack space allocated?.
The stack space is allocated in the kernel virtual memory address
space (3GB - 4GB). There is one kernel mode stack per user process.
There is also one kernel mode stack per kernel process (i.e. the
processes that are not attached to any user process - created using
kernel_thread()).
I'm not sure about the interrupt mode stack though, but I guess there
is ONE interrupt mode stack per CPU (And all drivers share it?).
>
> How does kernel get the address of the process descriptor from the stack
> pointer?
Look for the "current" macro in current.h.
Thanks,
Rajat
