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Date: | Fri, 26 Jul 2013 04:03:28 -0700 (PDT) |
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Subject: | Re: Beta Test: CWSDPMI r7 - 4GB support |
From: | Georg Potthast <dosusb AT googlemail DOT com> |
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The memory mapped registers usually "hang out" at the end of the 4GB memory area. I think there should be enough memory within the 4 GB area to allocate a DMA buffer there. But to allocate the buffer anywhere starting above the 4 GB area you will have to be able to write a 64bit linear address into the HW register. So far I have only seen 32bit HW registers. If you manage to write a 64bit linear address into the HW register, CWSDPMI would need to provide a DPMI function like "Int 31H Function 0800H" for the area above 4 GB to allow you to access that with 32bit addresses. I doubt that this was on the agenda yet.
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