DMA register function + macros

Hi all,

I have created a patch that adds register and unregister functions for DMA 
channels and defines macros for DMA functions. Most of the changes are based
on the "bochs sync" version of plex86. The patch is present in the patches 
directory in CVS.

Here is the list of changes:

  * register/unregister functions for DMA channels added. The DMA controller
    can use the DMA read/write handlers of registered devices directly.
  * "hardwired" code in dma.cc removed
  * all DMA related code in devices.cc and iodev.h removed
  * DMA related code in pc_system.* removed except HRQ handling
  * macros for DMA functions defined
  * floppy and SB16 code modified to use the changes described above

-- 
Bye

Volker


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