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    SubjectRe: Direct access to hardware
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    James Sutherland <jas88@cam.ac.uk> 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
    pentiums?
    --
    Krzysztof Halasa
    Network Administrator

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