mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 267

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

Memory Management Unit
11.8.1.1 TRANSLATION RELOAD EXAMPLES. The following are code examples for
generating the real page number using a two-level tree page table structure. The first
example is for a data TLB reload and the second is for an instruction TLB reload. Notice that
the following assumptions are made:
dtlb_swtw
itlb_swtw
• M_TWB holds the base pointer to the first level table.
• Both instruction and data address translation is turned off (MSR
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MPC823 REFERENCE MANUAL
M_TW, R1
R1, M_TWB
R1, (R1)
MD_TWC,R1
R1, MD_TWC
R1, (R1)
MD_RPN, R1
R1, M_TW
M_TW, R1
R1, SRR0
MD_EPN, R1
R1, M_TWB
R1, (R1)
MI_TWC,R1
MD_TWC,R1
R1, MD_TWC
R1, (R1)
MI_RPN, R1
R1, M_TW
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# save R1
# load R1 with level one pointer
# Load level one page entry
# save level two base pointer and
# level one attributes
# load R1 with level two pointer
# while taking into account the
# page size
# Load level two page entry
# Write TLB entry
# restore R1
# save R1
# load R1 with instruction miss
# effective address (the same data
# may be taken from the MI_EPN
# register)
# save instruction miss effective
# address in MD_EPN
# load R1 with level one pointer
# Load level one page entry
# save level one attributes
# save level two base pointer
# load R1 with level two pointer
# while taking into account the
# page size
# Load level two page entry
# Write TLB entry
# restore R1
IR
=0 and MSR
MOTOROLA
DR
=0).