Re: Priviledge switch with 'iret'

• To: Johan Rydberg <jrydberg@night.trouble.net>
• Subject: Re: Priviledge switch with 'iret'
• From: vhandel@chem.vu.nl (Ramon van Handel)
• Date: Tue, 27 Apr 1999 12:19:07 +0100
• Cc: oskit-users@cs.utah.edu
• Sender: owner-oskit-users@fast.cs.utah.edu

>I have four segments: KCS, KDS, UCS and UDS. K* have DPL 0, U* has DPL 3.
>When I tries to make an far iret from K* segments to U* segments it
>doesn't make a priviledge switch -> it doesnt pop the UESP and SS from the
>stack. Why's that?

What segment values are you using ?  Don't forget that you need to set the
RPL in the segments... so if your user code segment is at 0x18 in the GDT,
you should be using (0x18|3) as your segment value.  Same goes for the user
data segment.  Could that be the problem ?

Ramon


---
Ramon van Handel   <vhandel@chem.vu.nl>
Chemistry Student, OS Programmer and all-round Weirdo
The ant has made himself illustrious / Through constant industry industrious.
So what? Would you be calm and placid / If you were full of formic acid?
(Ogden Nash)

• Re: Priviledge switch with 'iret'
• From: Johan Rydberg <jrydberg@night.trouble.net>

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