interrupt vector

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Hi all,

I came accross an inline assembler directive in the kernel code for intel
(arch/i386/kernel/process.c):

int $0x80\n\t"		/* Linux/i386 system call */

I found out, that "int" calls an interrupt routine. In this case, the
routine at the address 0x80 in the interrupt vector (I hope, I'm right so
far...)

The Problem is: Intel says, everything between 32 and 255 are user defined
interrupts.  Does anyone have an idea, where in my sources I could find the
definition of the interrupt vector in order to find out what the code does?

Regards, 
Paul 

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