Re: Why need the Global Descriptor Table in the kernel?

[Martin Jambor <jamborm@xxxxxxxxx>]

On 6/8/05, Xiangfei Jia <xjianz@xxxxxxxxx> wrote:
> What I can't understand is that why don't the
> kernel just use linear addresses, without worrying logical address. Beause
> to me, the logical address makes no use in this case.

Because it is basically compulsory on i386 architectures. You cannot
avoid having a GDT in protected mode of the processor (you can't
switch segmentation off, unlike paging, btw). In other words,
processor instructions take logical address as parameters, not linear
ones.

HTH

Martin Jambor

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