[fpc-devel]Direct Memory Access and Iterrupts under Linux

[svtvn at bol.com.br]

Michael Van Canneyt wrote:

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> On Mon, 23 Oct 2000 svtvn at bol.com.br wrote:
>
> > How I can access DMA and Interrupts under Linux? I want make a graph
> > library but it´s need and I can´t do it (it crash my program).
>
> Normally you can't access DMA, unless you write a device driver.
> All you have is access to io ports and certain memory areas.
>
> I suggest you have a look at the svgalib sources and see how they do it.
>
> Michael.
>
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Ok! I´ve look at svgalib sources but it´s very hard to understannd. I
understand that it allocate a new virtual console with some system calls and
access your memory area (I´m not sure, but I think is it). I´ve ask because
when I´m configuring my sound card it ask what is DMA address, well, it´s
part of Linux kernel. But other programs can´t acess DMA? I don´t know other
whay to made a graph library (I made a graph library for DOS, it´s easy).

If I´ve wrote some error words it´s because I don´t speak englsh very well.
I´m a brazilian and speak portuguese!