Return to BSD News archive
Path: sserve!newshost.anu.edu.au!munnari.oz.au!news.Hawaii.Edu!ames!haven.umd.edu!darwin.sura.net!spool.mu.edu!nigel.msen.com!math.fu-berlin.de!irz401!uriah!not-for-mail
From: j@bonnie.tcd-dresden.de (J Wunsch)
Newsgroups: comp.os.386bsd.development
Subject: Re: V86 mode & the BIOS (was Need advice: Which OS to port to?)
Date: 9 Aug 1993 15:35:43 +0200
Organization: Textil Computer Design GmbH Dresden, Germany
Lines: 12
Message-ID: <245jrfINNrc0@bonnie.tcd-dresden.de>
References: <3390@vall.dsv.su.se> <CB11pL.D12@imag.fr> <107181@hydra.gatech.EDU> <1993Aug4.073826.24956@fcom.cc.utah.edu> <107725@hydra.gatech.EDU>
NNTP-Posting-Host: bonnie.tcd-dresden.de
In <107725@hydra.gatech.EDU> gt8134b@prism.gatech.EDU (Howlin' Bob) writes:
>can use them), but all this is done by the Linux ioperm() system
>call, which makes use of the 386's TSS I/O bitmap field.
Does this mean, you've a 64 K IO bitmap there? If so, process context
switch must be terribly slow. If not, what do you do with those recent
grafx adaptors that care to use IO ports above 0x3ff?
--
in real life: J"org Wunsch | ) o o | primary: joerg_wunsch@tcd-dresden.de
above 1.8 MHz: DL 8 DTL | ) | | private: joerg_wunsch@uriah.sax.de
| . * ) == |
``An elephant is a mouse with an operating system.''