On 5/10/10 6:37 PM, Balachandar wrote:
Hello,
We transit from ring3 to ring0 using 'int' or the new
'syscall/sysenter' instruction. Does that mean that the page tables
and other stuffs that needs to be modified for the kernel is
automatically done by the 'int' instruction or the interrupt handler
for the 'int 0x80' will do the required stuff and jump to the
respective system call.
Also when returning from a system call, we again need to go to user
space. For this we need to know the instruction address in the user
space to continue the user application. Where is that address stored.
Does the 'ret' instruction automatically changes the ring from ring3
to ring0 or where/how this ring changing mechanism takes place?
Then, i read that changing from ring3 to ring0 is not as costly as
changing from ring0 to ring3. Why is this so??
Thanks,
Bala
Hi Bala,
Have you referred this?
http://tldp.org/HOWTO/html_single/Implement-Sys-Call-Linux-2.6-i386/
http://www.ibm.com/developerworks/linux/library/l-system-calls/index.html
Daniel