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From: | jb3207 AT eclipse DOT co DOT uk (Jason Barstow) |
Newsgroups: | comp.os.msdos.djgpp |
Subject: | Re: VBE 2.0 Pmode Bank Switching... |
Date: | Sat, 15 Feb 1997 20:02:43 GMT |
Organization: | Jabber Interactive |
Lines: | 16 |
Message-ID: | <5e54vt$pp1@news.cableinet.net> |
References: | <Pine DOT SUN DOT 3 DOT 95 DOT 970208215834 DOT 13653A-100000 AT linknet DOT kitsap DOT lib DOT wa DOT us> <o9ZZ4BAs0j$yEw+O AT talula DOT demon DOT co DOT uk> |
Reply-To: | jb3207 AT eclipse DOT co DOT uk |
NNTP-Posting-Host: | p10.callisto.eclipse.co.uk |
To: | djgpp AT delorie DOT com |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
>Also, some cards use memory-mapped IO, in which case you have to create >a pmode selector for accessing the required addresses, and put it in %es >before calling the switch routine. You can determine if this is the case >by looking at the IOPrivInfo field in the PM_INFO structure. Can you give an example of a card that uses MMIO? I've written the MMIO bank switch routines but I'm still using the old INT method until I get a chance to test it out. Also, is it only the bank swith code that requires %es? I don't remember seeing MMIO alternatives for other VESA functions. Thanks, Jason.
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