tlbsx

TLB Search Indexed

tlbsx RA, RB

Searches the TLB for an address.

Encoding

Binary Layout

31

0:5

/

6:10

RA

11:15

RB

16:20

914

21:30

/

31

 

Format X-form

Opcode 0x7C000722

Extension Embedded

Operands

• RA
  Base
• RB
  Index

Example

tlbsx r4, r5

Related

More in Embedded

Reference

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

Description

Searches the TLB for an entry matching the virtual address formed by combining RA and RB, and loads matching entry data into MAS0-MAS3 registers. If a match is found, MAS0.ESEL contains the entry index and MAS1-MAS3 contain the matching entry data. This instruction is privileged and affects MAS registers but not the general condition register.

Operation

EA ← (RA) + (RB)
if TLB.lookup(EA) then
  MAS0 ← TLB.index(EA)
  MAS1 ← TLB[index].MAS1
  MAS2 ← TLB[index].MAS2
  MAS3 ← TLB[index].MAS3
else
  MAS0.NOMPLT ← 1
end if