From: tmoran@bix.com (Tom Moran)
Subject: Re: How do I get this to work??
Date: 1999/01/10
Date: 1999-01-10T00:00:00+00:00 [thread overview]
Message-ID: <36993523.2075072@news.pacbell.net> (raw)
In-Reply-To: 77abdp$d5e$1@nnrp1.dejanews.com
>segmentation is present in the PII, for
>compatibility purposes, and used in some limited manners in
>the operating system kernel
How could one write such operating system kernel code with a
compiler that did not recognize the existence of segmented addresses?
(Other than using asm code.)
> Ada 95 *does* provide
>a linear address model via the Integer_Address type in
>System.Storage_Elements
Besides the use of segments in the 8086 as a way of partially
caching memory address, and its additional use in the 286/B5500 et al
for protection and virtual memory, what about things like bank memory
architectures (eg, CDC160-A/8090 to name one)?
What does System.Storage_Elements."-" do when the two addresses are
in different distributied partitions, potentially on different
machines? Raise Program_Error, depending on where the partitions
happen to reside? I hope not.
>C does NOT provide a
>linear view of the address space, so general address
>arithmetic is not possible in C
I sure wish I had a penny for each C programmer who believes that in
char a[10],b;
'b' is the same as a[10]. And of course the 'buffer overflow'
security holes demonstrate that is usually a correct assumption.
>assuming *you* know the 5500 architecture well
A long time ago, as an RA in the U of Wisconsin Computer Center, most
of my job was maintaining and enhancing the OS on their B5500s.
next prev parent reply other threads:[~1999-01-10 0:00 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-01-04 0:00 How do I get this to work?? Chris Warwick
1999-01-05 0:00 ` Chris Warwick
1999-01-05 0:00 ` Stephen Leake
1999-01-05 0:00 ` Tom Moran
1999-01-06 0:00 ` robert_dewar
1999-01-06 0:00 ` Tom Moran
1999-01-07 0:00 ` robert_dewar
1999-01-07 0:00 ` Tom Moran
1999-01-10 0:00 ` robert_dewar
1999-01-06 0:00 ` Tom Moran
1999-01-07 0:00 ` robert_dewar
1999-01-07 0:00 ` Tom Moran
1999-01-10 0:00 ` robert_dewar
1999-01-10 0:00 ` Tom Moran
1999-01-10 0:00 ` robert_dewar
1999-01-10 0:00 ` robert_dewar
1999-01-10 0:00 ` Pat Rogers
1999-01-10 0:00 ` Tom Moran [this message]
1999-01-06 0:00 ` Larry Kilgallen
1999-01-06 0:00 ` Tom Moran
1999-01-06 0:00 ` Chris Warwick
1999-01-06 0:00 ` Tom Moran
1999-01-07 0:00 ` robert_dewar
1999-01-09 0:00 ` Chris Warwick
1999-01-09 0:00 ` Brian Rogoff
1999-01-10 0:00 ` Matthew Heaney
1999-01-09 0:00 ` Simon Wright
1999-01-10 0:00 ` robert_dewar
1999-01-11 0:00 ` Simon Wright
1999-01-16 0:00 ` Chris Warwick
1999-01-16 0:00 ` Simon Wright
1999-01-16 0:00 ` robert_dewar
1999-01-18 0:00 ` Chris Warwick
1999-01-18 0:00 ` Matthew Heaney
1999-01-16 0:00 ` Matthew Heaney
1999-01-16 0:00 ` robert_dewar
1999-01-18 0:00 ` Chris Warwick
1999-01-18 0:00 ` Matthew Heaney
1999-01-18 0:00 ` robert_dewar
1999-01-18 0:00 ` dennison
1999-01-18 0:00 ` Tucker Taft
1999-01-19 0:00 ` Chris Warwick
1999-01-19 0:00 ` Stephen Leake
1999-01-19 0:00 ` robert_dewar
1999-01-20 0:00 ` Jeff Carter
1999-01-20 0:00 ` robert_dewar
1999-01-21 0:00 ` Chris Warwick
1999-01-19 0:00 ` Tom Moran
1999-01-18 0:00 ` dennison
1999-01-07 0:00 ` Stephen Leake
1999-01-08 0:00 ` Simon Wright
1999-01-06 0:00 ` robert_dewar
1999-01-06 0:00 ` Simon Wright
1999-01-22 0:00 ` Nick Roberts
1999-01-05 0:00 ` Tom Moran
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