Messages in this thread | | | Date | Sat, 12 May 2007 11:59:42 -0700 | From | "H. Peter Anvin" <> | Subject | Re: x86 setup rewrite tree ready for flamage^W review |
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Eric W. Biederman wrote: > > Even on 386 and 486 class cpus? >
Yes, even on 386 and 486 class CPUs. I have personally tested this on machines as old as the original "double sigma" 386-16.
> To some extent if the rules don't change it makes sense for them to > copy the information from one generation to the next of the architecture. > Even if the current cpus don't really care. > > I guess I just don't see the sense in taking chances if we don't have > to, and I don't see any real advantage of doing a data segment reload > before the jump.
It makes the code cleaner -- more debuggable -- by introducing clean separation between 16- and 32-bit code.
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