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Path: utzoo!dciem!nrcaer!xios!greg
From: greg@xios.XIOS.UUCP (Greg Franks)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Switching from Protected to Real Mode
Message-ID: <388@xios.XIOS.UUCP>
Date: Fri, 25-Sep-87 15:39:57 EDT
Article-I.D.: xios.388
Posted: Fri Sep 25 15:39:57 1987
Date-Received: Wed, 30-Sep-87 02:48:14 EDT
References: <1387@imagen.UUCP> <4047@utai.UUCP> <1343@gryphon.CTS.COM> <1203@cartan.Berkeley.EDU>
Reply-To: greg@sdn.UUCP (Greg Franks)
Organization: XIOS Systems Corporation, Ottawa, Ontario, Canada
Lines: 22

In article <1203@cartan.Berkeley.EDU> ballou@bosco.berkeley.edu (Kenneth R. Ballou) writes:
>ledge.  Of course, I still haven't forgiven Intel (not that they care, I'm
>sure) for putting the global/local and privilege level bits in the *LOW
>THREE BITS* of the segment descriptor.  I would be very impressed if anyone
>could give me a convincing explanation that there is enough gained by this
>in return for sacrificing a 29-bit linear address space.

Tis obvious :-)...  Segment table entries are all 8 bytes long.  Soooo...

	segment_descriptor & 0xfff8 + table_offset = address

Now, why they couldn't simply SHIFT THE STUPID SEGMENT DESCRIPTOR IN
SILICON.... 

This is, of course, purely conjecture because I really don't know why
intel did what they did.

   **** sigh ****
-- 
Greg Franks             XIOS Systems Corporation, 1600 Carling Avenue,
(613) 725-5411          Ottawa, Ontario, Canada, K1Z 8R8
uunet!mnetor!dciem!nrcaer!xios!greg        "Vermont ain't flat!"