From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 103376,6394e5e171f847d1 X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2001-09-12 00:07:55 PST Path: archiver1.google.com!newsfeed.google.com!newsfeed.stanford.edu!news.tele.dk!small.news.tele.dk!213.204.128.162!news000.worldonline.se!news010.worldonline.se!not-for-mail Message-ID: <3B9F0ACE.5BE70C25@mida.se> From: Mats Karlssohn Organization: MIDA Systemutveckling AB X-Mailer: Mozilla 4.77 [en] (WinNT; U) X-Accept-Language: en MIME-Version: 1.0 Newsgroups: comp.lang.ada Subject: Re: Ada OS Kernel features References: <9n4euv$t9m$1@slb6.atl.mindspring.net> <3B964C7A.BC04374E@icn.siemens.de> <9n5o9n$37a$1@slb7.atl.mindspring.net> <3%ul7.3362$9z1.440040@news6-win.server.ntlworld.com> <3b987e18.2182875@news.cis.dfn.de> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Date: Wed, 12 Sep 2001 09:12:14 +0200 NNTP-Posting-Host: 213.204.132.172 X-Trace: news010.worldonline.se 1000277743 213.204.132.172 (Wed, 12 Sep 2001 07:55:43 WET DST) NNTP-Posting-Date: Wed, 12 Sep 2001 07:55:43 WET DST Xref: archiver1.google.com comp.lang.ada:13041 Date: 2001-09-12T09:12:14+02:00 List-Id: Mattias Svensson wrote: %< > Why? If the video driver has exclusive access to the video memory and > just presents an API to other programs by some menas of IPC. In what > way is this different from having the video driver in the kernel? > The hard part I think is to give access to the video memory from > userspace. Not really, at least on IA-32. The I/O address space can be delegated to user processes on a per-address basis. Memory can be delegated on a page (fixed size) or segment (can be of variable size) basis. -- Mats Karlssohn, developer mailto:mats@mida.se Mida Systemutveckling AB http://www.mida.se Box 64, S-732 22 ARBOGA, SWEDEN Phone: +46-(0)589-89808 Fax: +46-(0)589-89809