Followup to: <m1smrl5mbw.fsf@frodo.biederman.org>
By author: ebiederm@xmission.com (Eric W. Biederman)
In newsgroup: linux.dev.kernel
>
> There is some software at least that knows the difference. I have seen short
> jumps in a couple of BIOS's. But a reset is very different from a
> reboot. As memory must be reinitialized etc. So I think going to
> 0xffff0000:0xfff0 would be a very bad idea if the intent is to get a
> reliable reboot.
>
I agree.
Jumping to 0xf000:0xfff0 is widely accepted to be a standard warm
reboot (as *should* an INIT, e.g. triplefault, be, as well -- make
sure A20 is enabled before tripping, though.) For quite a few (most?)
BIOSes, the vector that is stored at 0xf000:0xfff0 in the running
(BIOS decompressed and shadowed) configuration is *not* the same as
the one at the RESET vector.
-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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Thu May 15 2003 - 22:00:43 EST