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- Xref: sparky comp.sys.ibm.pc.hardware:24047 comp.os.msdos.programmer:9291
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- Path: sparky!uunet!mcsun!fuug!kiae!relcom!news-server
- From: root@sean.tomsk.su (Alex Povzner)
- Subject: Is it possible to use correctly DMA in Protected Mode ?
- Message-ID: <ADVS5igm46@sean.tomsk.su>
- Lines: 25
- Sender: news-server@kiae.su
- Reply-To: root@sean.tomsk.su
- Organization: Elecard ltd hq
- References: <1992Aug31.152155.2190@brandonu.ca>
- Date: Fri, 11 Sep 92 16:21:51 +0800
-
- > In article <1992Aug26.162928.20891@csqx.cs.rhbnc.ac.uk>, adrian@csqx.cs.rhbnc.ac.uk (A Johnstone) writes:
- > > Well, my DMA saga continues. Several people told me after my last post that
- > > vanilla MS-DOS does map virtual to physical as in real mode until you start
- > > filling memory up (contrary to what I had claimed). I now have basic DMA
- > > working on a 386, having fixed the timing problem that had been causing the
- > > virtual DMA to fail.
- > >
-
- I have not reached full an understanding of your thought, but
- have met some words having attracted my attention. My current task is
- to make working under Protected Mode a library that erlier has been working
- with DMA under Real Mode. Is there any method to do that, taking into account
- mixing of addresses in the case of Protected Mode ? If I rightly estimates
- the situation, sometimes DMA will get requests to fill or read a memory
- region devided into pieces allocated in different places of the phisical
- memory. Is this problem generally resolvable ? Is it possible to use
- DMA in Protected Mode or not ?
-
- Alex Povzner
- ----------------------
- root@sean.tomsk.su
- Tomsk,Siberia,Russia (Moscow,balalaika,etc)
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