void * mca_device_transform_memory (struct mca_device * mca_dev, void * mem);
MCA Adapter Definition Files (ADF) contain irq, ioport, memory etc. definitions. In systems with more than one bus, these need to be transformed through bus mapping functions to get the real system global quantities.
This function transforms the memory region start and returns the transformed system global memory region (physical).
This transformation can be assumed to be linear for region ranges.