[unios] Re: Generic design. More comments

[Pieter Dumon]

From: Pieter Dumon <Pieter.Dumon@rug.ac.be>

> 
> How about on other systems?

All other OSs put the OS in an inaccessible part of the user space.
When there is a system call or hardware interrupt, control is switched
to the kernel in this part. E.G. NT reserves the upper 1GB of memory
for its own, leaving the processes with 3GB each.
But NT puts the parts of its executive (object manager, security manager,
I/O manager etc) all in seperate memory spaces. They tried to put the 
cpu scheduler and memory scheduler into the executive too, in seperate
memory spaces, but this was slow, so they put it in a microkernel.
NT has a pretty good design. Of course, it is designed by Digital
programmers bought by MS.  

Pieter

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