simple serial device emulation

[Hinko Kocevar <hinkocevar@gmail.com>]

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I have an emulated MMIO area holding couple of registers that deal with
serial UART. Very simple access to the Tx and Rx registers from the
userspace point of view involves polling for a bit in one register and then
writing another; when there is room for another character. When the guest
app does write to a MMIO Tx register, as expected, io_writex() is invoked
and my handler is invoked. At the moment it does not do much. I'm thinking
now that the character needs to be fed to the serial device instance or
something.

Where should I look for suitable examples in the qemu code? I reckon that
other machines exist that do the similar. I found lots of serial_mm_init()
and sysbus_mmio_map() uses around serial port instances but I'm not sure
how to couple my "serial ops" to the "bus" or SerialMM (if that is the way
to go).

Thanks!
//hinko

-- 
.. the more I see the less I believe.., AE AoR

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