Freescale Semiconductor PowerQUICC MPC885 Reference Manual page 274

Powerquicc family

Table of Contents

Memory Management Unit

Translation Reload Examples

The following examples reload a TLB entry using a two-level tree page table structure. In both examples,

M_TWB holds the base pointer to the first-level table and data and instruction address translation are

performs a DTLB reload.

performs an ITLB reload.

# Load R1 with level-1 pointer

# Load level-1 page entry

# Save level-2 base pointer and level-1 attributes

# Load R1 with level-2 pointer while taking page

# size into account

# Load level-2 page entry

# Write TLB entry

# Restore R1

Figure 8-23. DTLB Reload Code Example

# Load R1 with instruction miss EA (the same data

# may be taken from MI_EPN)

# Save instruction miss EA in MD_EPN

# Load R1 with level-1 pointer

# Load level-1 page entry

# Save level-1 attributes

# Save level-2 base pointer

# Load R1 with level-2 pointer while taking page

# size into account

# Load level-2 page entry

# Write TLB entry

# Restore R1

Figure 8-24. ITLB Reload Code Example

MPC885 PowerQUICC Family Reference Manual, Rev. 2

Freescale Semiconductor