Re: [PATCH] Pentium Pro - sysenter - doublefault

[Jamie Lokier]

Jamie Lokier wrote:
> So that means the sysenter instruction _does_ exist on the PPro and
> early Pentium II, but it isn't usable.

If anyone has information on what the SYSENTER and SYSEXIT
instructions actually do on Intel Pentium Pro or stepping<3 Pentium II
processors, I am very interested.

I'm intrigued to know if the buggy behaviour of these instructions is
really unsafe, or simply hard to use so Intel changed the behaviour.
(An example of hard to use would be SYSENTER not disabling
interrupts).  If they are safe but hard to use, perhaps the ingenuity
of kernel hackers can work around the hardness >:)

Does anyone have a contact at Intel for this question?

Thanks,
-- Jamie
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/