wrtee

Write MSR External Enable

wrtee RS

Updates the EE bit of the MSR from a GPR.

Encoding

Binary Layout

31

0:5

RS

6:10

/

11:15

/

16:20

131

21:30

/

31

 

Format X-form

Opcode 0x7C000106

Extension Embedded

Operands

• RS
  Source

Example

wrtee r3

Related

More in Embedded

Reference

View in PowerISA v3.1C Specification ↗ OPF Power ISA v3.1C

Description

Updates the Machine State Register (MSR) External Enable (EE) bit from the least significant bit of RS. This instruction is privileged and allows software to enable or disable external interrupts. The EE bit controls whether external interrupts are recognized by the processor.

Operation

MSR.EE ← RS[63]