lcall7/lcall27 call gates

[C.Mohanasundaram <mohanc@lucid.co.in>]

Hi all,

I took the below quoted lines from Linux Kernel Internals book

"There are two mechanisms under Linux for implementing system calls: 

     lcall7/lcall27 call gates; 
     int 0x80 software interrupt. "

I understood the second one i.e
how system calls r implemented under i386 architecture using int 0x80 
software interrupt.

But i dont have any idea about lcall7/lcall27 call gates.

Can any one please tell me how it works.

thanks and regards,
mohan.
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