GDT

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Article #118

#118

From: Marigowda Divya
Date: Tue, 24 Nov 1992 00:17

22 lines
959 bytes

I am trying to define an Executable Segment Descriptor (with 
READABLE code); but system reboots when I try to load GS with
this selector.  Are any of the bits wrong (especially the TYPE bits)?

Here are a few relevant clips from my program:

   gdt   dw  0,0,0,0
         dw  0ffffh,0,9a00h,8fh
   gdtptr dw 0fh,0,0

       ......
          mov bx,8   ;selector
          mov gs,8   ;loading segment with intention of "Reading" code

PC boots at this point.  I have tried this code with 9200H (Data segment
Descriptor/Writable) and it works.  Thanks in advance for any help.

Cheers,
divya
(mdivya@world.std.com)

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Newsgroups: alt.lang.asm
Path: arc1-ca.pugleaf.net!sparky!uunet!world!mdivya
From: mdivya@world.std.com (Marigowda Divya)
Subject: GDT
Message-ID: <By725z.C19@world.std.com>
Summary: GDT
Keywords: GDT 386 Assembler
Organization: The World Public Access UNIX, Brookline, MA
Date: Tue, 24 Nov 1992 00:17:59 GMT
Lines: 22