slbmfee

SLB Move From Entry ESID

slbmfee RT, RB

Reads the ESID part of an SLB entry.

Encoding

Binary Layout

31

0:5

RT

6:10

/

11:15

RB

16:20

366

21:30

/

31

 

Format X-form

Opcode 0x7C000726

Extension Privileged

Operands

• RT
  Target
• RB
  Index

Example

slbmfee r3, r5

Registers Altered

LPCRUPRT

Related

More in Privileged

Reference

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

Description

Reads the ESID (Effective Segment ID) portion of a Segment Lookaside Buffer entry. The SLB entry is selected by the index in RB. This privileged instruction is used in 64-bit mode for TLB management. No condition or status registers are modified.

Operation

RT ← SLB[RB].ESID

Programming Note

The slbmfee instruction is used to read software-loaded SLB entries, placing the ESID and V fields into register RT. If the entry is valid and LPCRUPRT is set, it also places the BO field into RT. Ensure that the index calculation respects the LPCRUPRT setting to avoid accessing invalid SLB entries.