Freescale Semiconductor PowerPC e500 Core, Reference Manual

Page: 393 / 548

Memory Management Units
PowerPC e500 Core Family Reference Manual, Rev. 1
Freescale Semiconductor 12-3
12.1.2 TLB Entry Maintenance Features
The TLB entries of the e500 core complex must be loaded and maintained by the system software;
this includes performing any required table search operations in memory. The e500 provides
support for maintaining TLB entries in software with the resources shown in
Table 12-1 . Note that
many of these features are defined at the Freescale Book E level.
t
Other hardware assistance features for maintenance of the TLBs on the e500 are described in
Section 12.5, “TLB Entry Maintenance—Details .”
Table 12-1. TLB Maintenance Programming Model
Features Description
More Information
Section/Page
TLB
Instructions
tlbre TLB Read Entry instruction 12.4.1/12-18
tlbwe TLB Write Entry instruction 12.4.2/12-19
tlbsx r A , r B
(preferred form is tlbsx 0, r B)
TLB Search for entry instruction 12.4.3/12-19
tlbivax r A , r B TLB Invalidate entries instruction 12.4.4/12-20
tlbsync TLB Synchronize invalidations with other
masters’ instruction 12.4.5/12-22
Registers PID0–PID2 Process ID registers See Table 12-7 for
more
comprehensive
cross references
MMUCSR0 MMU control and status register
MMUCFG MMU configuration register
TLB0CFG–TLB1CFG TLB configuration registers
MAS0–MAS4, MAS6;
e500v2 also implements MAS7 MMU assist registers. Note that MAS5 is not
implemented on the e500.
DEAR Data exception address register
Interrupts Instruction TLB miss exception Causes instruction TLB error interrupt 12.5.1/12-23
Data TLB miss exception Causes data TLB error interrupt
Instruction permissions violation exception Causes ISI interrupt 12.5.2.1/12-24
Data permissions violation exception Causes DSI interrupt