doubt ?

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hi,

what is the use of gates in the intel processors ?
what is the use of interrupt gate ?

please tell me my assumption is correct about gates.
i think gates are used to provide access control 
to the interrupt.This is the way we can use this 
to restict a particular interrupt.If this is correct
then the
linux kernel set the interrupt 0x80 is accessible to
application
program and other interrupts are not accessible to 
application program.Am i correct ?

please tell me how many segments are created when a 
process is created ?.What are the segments are created
when 
we create a process ?

thanks
bye







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