Re: [PATCH] Use correct x86 reboot vector
H. Peter Anvin (hpa@zytor.com)
11 May 2003 18:07:54 -0700
Followup to: <20030511190023.GC9173@waste.org>
By author: Matt Mackall <mpm@selenic.com>
In newsgroup: linux.dev.kernel
>
> There's a missing piece of behavior here that's probably fatal.
> Namely, the next time the CS descriptor is loaded, even with the same
> value, the high bits are lost. So, for example, if you're running BIOS
> out of ROM, decompressing it into the top of 20-bit address space,
> then long jumping to your uncompressed code, you don't want to find
> yourself back in ROM.
>
Nope, that's *exactly* the desired behaviour.
-hpa
--
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
Architectures needed: ia64 m68k mips64 ppc ppc64 s390 s390x sh v850 x86-64
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