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SubjectRe: Direct access to hardware
James Sutherland <> writes:

> On Tue, 25 Jul 2000, Stuart MacDonald wrote:
> > Which is exactly the point. The hard drives should be checking for
> > invalid ATA commands in hardware, right in the drive, preventing
> > damage from bad commands. Putting a filter into the kernel is not
> > the right fix.
> As with some of the Intel CPU bugs, the problem is NOT "invalid ATA
> commands" - it's a matter of VALID commands which are dangerous. FDIV on
> early Pentiums isn't an invalid instruction - it just produces the wrong
> results at times. So the SOFTWARE must do something to avoid this - either
> that, or you need to replace the hardware, which isn't desirable. You do
> something in the OS to prevent these problem commands being used.

So what does the kernel (can) do to prevent this problem on defective
Krzysztof Halasa
Network Administrator

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