Very Computer

1. Sparcs and atomic read/modify/write operations

I'm writing a device driver for an SBus card whose controller chip
shares with the kernel a number of data structures in main memory.  
For handling a few edge/error conditions, the controller chip
documentation gives the following advise:

        If the host can do a read/modify/write:
                (do something incredibly easy)
        else
                slog through the following hairy pseudocode

Obviously, I'd prefer the former, if possible, but I'm not aware of
the contraints any particular Sun architecture places on me, or
what constructs I'd need to enforce this in my code.  I just
need do an atomic r/m/w of a single 32-bit word in main memory.

Any ideas or pointers to references or sample code?

--
Steve Dyer

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