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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
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Newsgroups: comp.lang.ada
Subject: Re: Arbitrary Sandbox
Date: Sat, 18 Feb 2012 13:57:54 +0100
Organization: Ada @ Home
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Date: 2012-02-18T13:57:54+01:00
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Le Sat, 18 Feb 2012 12:31:42 +0100, Dmitry A. Kazakov  =

<mailbox@dmitry-kazakov.de> a =C3=A9crit:
>>>> You know; I always wondered why they (developers, and OS designers)=

>>>> didn't take advantage of segments.
>>>
>>> Ineffective, complicated, generally useless?
>> Why?
>
> Presumably because of lack of address order. Comparing driver developi=
ng
> for PDP-11/RSX-11 vs. 80286/Windows/DOS. The former was immensely  =

> simpler,
> safer and also more effective (you could pass a buffer from the proces=
s
> space to the driver). The latter was a pure horror.

Segments can share physical addresses (since the i286), and there is  =

memory mapped IO ports (at least since the i386).

-- =

=E2=80=9CSyntactic sugar causes cancer of the semi-colons.=E2=80=9D [1]
=E2=80=9CStructured Programming supports the law of the excluded muddle.=
=E2=80=9D [1]
[1]: Epigrams on Programming =E2=80=94 Alan J. =E2=80=94 P. Yale Univers=
ity