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Newsgroups: comp.os.386bsd.development Path: sserve!newshost.anu.edu.au!munnari.oz.au!constellation!osuunx.ucc.okstate.edu!moe.ksu.ksu.edu!zaphod.mps.ohio-state.edu!howland.reston.ans.net!newsserver.jvnc.net!gmd.de!fanoe!veit From: veit@fanoe.gmd.de (Holger Veit) Subject: Re: 3C501 Ether driver, XS3+codrv Message-ID: <1993Mar12.074612.22684@gmd.de> Sender: veit@fanoe (Holger Veit) Nntp-Posting-Host: fanoe Organization: GMD - German National Research Center for Computer Science References: <1993Mar9.043947.4016@netcom.com> <1993Mar10.213242.423@netcom.com> <1993Mar11.090535.9238@gmd.de> <1993Mar12.033550.2947@netcom.com> Date: Fri, 12 Mar 1993 07:46:12 GMT Lines: 36 In article <1993Mar12.033550.2947@netcom.com>, hasty@netcom.com (Amancio Hasty Jr) writes: |> In article <1993Mar11.090535.9238@gmd.de> veit@fanoe.gmd.de (Holger Veit) writes: |> >In article <1993Mar10.213242.423@netcom.com>, thinman@netcom.com (Technically Sweet) writes: |> >kernel without problems. One is I/O and interrupt handling. There is |> >a hack to give the xserver the privilege to access I/O but |> >this imposes at least significant security leaks, if not stability |> >problems. The way it is done in this context is not recommended in |> >general. |> Well, the original patches which I distributed for X386 included i/o |> bitmap permissions. This approach was abandoned because of cards |> based on the 8514/a, like s3 chipsets use i/o ports much higher |> than normal vgas. We can still do it but it will be costly in |> terms of memory allocation for the process header. This is because the 8514s have quite a wierd I/O space mapping. The constant part is in the low byte, the high byte selects registers. I know this has been done by intent to avoid address clashes, but as you correctly remark, this enlarges the i386 task segment for each process by quite a sparsely filled I/O perm map. Anything possible to improve this situation? Is it possible to remap the I/O space 8514s to something more dense (besides a VGA emulation mode)? I believe, software emulation of the I/O permission testing is too time consuming. Holger |> e-mail hasty@netcom.com | sunvis.rtpnc.epa.gov:/pub/386bsd/incoming -- Dr. Holger Veit | INTERNET: Holger.Veit@gmd.de | | / GMD-SET German National Research | Phone: (+49) 2241 14 2448 |__| / Center for Computer Science | Fax: (+49) 2241 14 2342 | | / P.O. Box 13 16 | Three lines Signature space | |/ Schloss Birlinghoven | available for rent. Nearly DW-5205 St. Augustin, Germany | unused, good conditions