The Kernel Input/Output Tables
The HP-UX kernel allows no direct access to physical devices. All I/O must be requested through the proper channel: the system call interface. A key component of this model is the kernel's extensive set of drivers, device maps, and the overall system's general input/output (GIO) system.
A large portion of the kernel memory space is occupied by these various components. The modern HP-UX kernel provides for the dynamic mapping of some of these should it be required.
The I/O Tree
A key table is appropriately named the I/O tree. This tree structure is actually a collection of linked objects used to identify and map system hardware devices to specific software drivers. The tree's roots stretch back to the system initialization, ...
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