Hi,
at first : Happy holidays !

I'm new to FASM and currently trying to learn programming in assembly language.

I have a question :

What's the difference between a "far jump" and a "near jump" except that a "far jump" is a jump in the whole real mode adress space and a "near jump" is a jump limited to the segment it appears in.
Are there some other functions or whatever which the processor does during a "far jump" alternatively a "near jump" ?
Why and where is there a difference ?
It bothers me although its obviously not very important.

Im very sorry if I overlooked the answer for my questions in another thread or in the Programmers Manual.


PS: Kindly excuse my bad englisch (I'm german).

Goodbye,
Rafael.

Far: goes a long way.
Near: goes not a long way.

But far is only really useful in 16bit and segmented modes.

In Windows, and most other 32bit OSes, you only need near because all the segment registers give you the entire 32bit address space to 'near jmp' within.

And in 64bit mode, segmentation is completely abandoned. C and segmentation doesn't get together very well (ever tried to mess with far*far*, ptrdiff_t, etc?)

Except for GS right?

and FS, yeah

but they work quite differently. You have to load limit and access rights "normal way" (from GDT or LDT descriptor) first, and then load base address shadow register directly via MSR (to be able to assign full 64bit address to it).