EISA Mapping Support

EISA Mapping Support

In systems that support the EISA bus (Indigo2 Maximum Impact and Indigo2, Challenge M, and their Power versions), IRIX contains a kernel-level device driver that supports memory-mapping EISA bus addresses into the address space of a user process (see "Overview of Memory Mapping").

You can write a program that maps a portion of the EISA bus address space into the program address space. Then you can load and store from device registers directly.

For more details of PIO to the EISA bus, see Chapter 4, "User-Level Access to VME and EISA."