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Re: [Xen-devel] A useless short jmp?


  • To: "Li, Xin B" <xin.b.li@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: Keir Fraser <keir@xxxxxxxxxxxxx>
  • Date: Mon, 18 Jun 2007 16:39:52 +0100
  • Delivery-date: Mon, 18 Jun 2007 08:37:57 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcexsWxtRnqse1ngRRSVOXIcWSiSzwADXzoN
  • Thread-topic: [Xen-devel] A useless short jmp?



On 18/6/07 15:03, "Li, Xin B" <xin.b.li@xxxxxxxxx> wrote:

> According to Intel Spec, it's useless, do we have any special reason to
> have it there?
> BTW why put mov $1, %bl between lmsw and it's corresponding ljmp?

Hmmm... I'm sure I read somewhere about a jmp to clear the prefetch queue,
but reading the appropriate manual pages now I see I only need the ljmp.
I'll fix that and also move the write to %bx somewhere more sensible.

 Thanks,
 Keir


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