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

[srinivas bakki <srinivas.bakki@xxxxxxxxx>]

On 6/9/05, Martin Jambor <jamborm@xxxxxxxxx> wrote:
> 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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i remember filling GDT with TLS segments for glibc. what does this
segment mean ? is it that the glibc libraries are found in this
segment ?

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