4.3 Processor Family Specific I/O

Processor family specific I/O routines, previously located in a CPU library in the ChorusOS 3.2 operating system, are now part of the kernel DKI module and bus drivers in the ChorusOS 4.0 operating system. Device drivers must not communicate directly with the hardware, but must communicate through the DKI and appropriate bus DDI interface using the *busIoOps.load_8(), *busIoOps.store_8() calls.

See the ChorusOS 4.0 Device Driver Framework Guide for detailed information.