Assembly

Far jump to a label?

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Join Date: Mar 2008

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koyi

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Far jump to a label?

Mar 7th, 2008

Hi, I am pretty new with assembly so please bear with me if this question sounds stupid

I am teaching myself OS development from resources of the web. I came across this tutorial here which talks about setting up GDT. I don't really get it when it is to set the value of CS register using a far jump. The code is like this:

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jmp 0x08:flush2   ; 0x08 is the offset to our code segment: Far jump!
flush2:
    ret               ; Returns back to the C code!
jmp 0x08:flush2   ; 0x08 is the offset to our code segment: Far jump!
flush2:
    ret               ; Returns back to the C code!

Is the jmp command supposed to jump to "flush2" and continue its execution from "ret"? How can that happen? Isn't the long jump supposed to jump to 0x080 + (the address of flush2)?

Thanks in advance