Creating User-level Device Drivers

Creating User-level Device Drivers

User-level device drivers let you use system functions to map the device to user space and perform simple I/O operations. You do not have to understand how the software environment affects devices in the IRIX operating system. However, where specific versions of IRIX, such as 5.2 and 5.3 (both 32-bit) and 6.0 (64-bit), affect your decisions, or the performance of your driver, the differences are noted.