tlbia
Translation Lookaside Buffer Invalidate All - 7C 00 00 64
tlbia
Instruction Syntax
| Mnemonic | Format | Flags |
| tlbia | None | None |
Instruction Encoding
0
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
1
0
0
| Field | Bits | Description |
| Primary Opcode | 0-5 | 011111 (0x1F) |
| Reserved | 6-10 | 00000 |
| Reserved | 11-15 | 00000 |
| Reserved | 16-20 | 00000 |
| Reserved | 21-29 | 000000000 |
| Reserved | 30-31 | 00 |
Operation
Invalidate all entries in the Translation Lookaside Buffer
The tlbia instruction invalidates all entries in the Translation Lookaside Buffer (TLB), forcing the processor to reload page table entries from memory for subsequent memory accesses.
Note: The tlbia instruction is used in memory management operations to ensure that all TLB entries are cleared, typically after changes to the page tables.
Affected Registers
Translation Lookaside Buffer (TLB)
- All TLB entries are invalidated
Examples
Basic TLB Invalidation
tlbia # Invalidate all TLB entries
Memory Management
# After changing page table entries sync # Ensure memory operations complete tlbia # Invalidate all TLB entries sync # Ensure TLB invalidation completes
Context Switch
# During process context switch tlbia # Clear TLB for new process # Continue with new process execution