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Article #7310Re: Physical addresses in protected mode?
From: Duncan Murdoch
Date: Tue, 25 Jun 1991 02:31
Date: Tue, 25 Jun 1991 02:31
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In article <4948@gumby.Altos.COM> rcollins@altos.COM (Robert Collins) writes: > >If you are in V86 mode, then give it up because you are executing at IOPL=3 >which makes it impossible to get the physical address. If running under VCPI, there's a call to find the physical address corresponding to any V86 address. This is done by calling INT 67h with AX=0DE06h, CX=the linear V86 address shifted right 12 bits. It returns with EDX holding the physical address of the page. I imagine DPMI has a similar service, but I don't have the spec. Duncan Murdoch dmurdoch@watstat.waterloo.edu
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arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!mips!news.cs.indiana.edu!maytag!watstat.waterloo.edu!dmurdochReferences:
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!mips!news.cs.indiana.edu!maytag!watstat.waterloo.edu!dmurdoch From: dmurdoch@watstat.waterloo.edu (Duncan Murdoch) Newsgroups: comp.os.msdos.programmer Subject: Re: Physical addresses in protected mode? Message-ID: <1991Jun25.023154.16683@maytag.waterloo.edu> Date: 25 Jun 91 02:31:54 GMT References: <cchapman.677508274@msd> <4948@gumby.Altos.COM> Sender: news@maytag.waterloo.edu (News Owner) Organization: University of Waterloo Lines: 13