---------- Forwarded Message ----------
Subject: Re: [Dri-devel] Using drm (fwd)
Date: Sat, 13 Oct 2001 16:42:59 -0600
From: Keith Whitwell <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
> That's what I am trying to do. With not much luck so far. The reason (at
> least to me) is that the 3d driver is the interaction of 3 parts: kernel
> drm module, XFree driver (like radeon_dri.c) and the dri part (whatever
> goes into radeon_dri.so).
>
> > Second, it is easiest to answer your questions if you refer to specific
> > lines in specific files. There is no variable called "AGP Offset"
> > anywhere in the drm. Maybe there are some with similar names, but I
> > can't tell which one you're talking about.
>
> Finally, someone who knows the stuff :)) No, there is no such variable,
> but this phrase I plucked from the comment. Here is an example from
> radeon.h:
>
> /* CP vertex/indirect buffer data */
> unsigned long bufStart; /* Offset into AGP space */
> drmHandle bufHandle; /* Handle from drmAddMap */
> drmSize bufMapSize; /* Size of map */
> int bufSize; /* Size of buffers (in MB) */
> unsigned char *buf; /* Map */
> int bufNumBufs; /* Number of buffers */
> drmBufMapPtr buffers; /* Buffer map */
>
> Now, from these I guess that *buf is where I can access the data directly
> for Xserver. bufSize is the size of the thing - does it have to be in MB ?
It is interpreted as mb, hence the comment.
> Or just page-aligned is fine ? bufStart - what do I use this for ? Can I
> use it to reference data in the buffer or do I have to add or subtract a
> magic number from it before writing into card's registers ?
This is an offset from the start of the agp apperture.
These fields are setup in the 2d driver to tell the 3d driver how memory is
layed out. Have a look at radeon_dri.c to see how agp space is partitioned
up and these values are calculated.
> (and to answer
> your questions: I have made a copy of the same fields /with buf replaced
> with capture and allocated space.. nothing seems to crash.., 3d workds,
> 1mb is reserved someplace. /)
I don't think that copying these fields is going to reserve you any memory.
You'll need to modify radeon_dri.c to actually reserve memory. If you add a
field called 'KeithIsAMillionaire', it doesn't automatically make me rich...
Keith
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