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AIX Version 4.3 Assembler Language Reference

rfi (Return from Interrupt) Instruction

Purpose

Reinitializes the Machine State Register and continues processing after an interrupt.

Syntax

rfi

Description

The rfi instruction places bits 16-31 of Save Restore Register1 (SRR1) into bits 16-31 of the Machine State Register (MSR), and then begins fetching and processing instructions at the address contained inSave Restore Register0 (SRR0), using the new MSR value.

If the Link bit (LK) is set to 1, the contents of the Link Register are undefined.

The rfi instruction has one syntax form and does not affect Condition Register Field 0 or the Fixed-Point Exception Register.

Security

The rfi instruction is privileged and synchronizing.

Related Information

Branch Processor.


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