Chapter 4. Operating System Interface

Table of Contents
Processor Execution Mode
Exception Interface
Signal Delivery

LSB-conforming applications shall use the Operating System Interfaces as defined in Chapter 3 of the Intel® Itanium ™ Processor-specific Application Binary Interface.

Processor Execution Mode

Applications must assume that they will execute in the least privileged user mode (i.e. level 3). Other privilege levels are reserved for the Operating System.