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CSCI2510 Computer Organization
Tutorial 09:Associative mapping
in MASM
Yuhong LIANG
Outline
• LRU Algorithm
• First-In-First-Out Algorithm
CSCI2510 Tut09: Associative mapping implementation 2
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 3
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 4
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 5
7 7 7 7 7 3 3 3 3 3 3 3 3 3 3 3 3 7 7 7
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
1 1 1 1 1 4 4 4 4 4 4 1 1 1 1 1 1 1
2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
States
of
cache
1 1 1 1 1 6 6 6 6 10 10 12 12 12 12 12 12 18 18 18
2 2 2 5 5 7 7 7 7 11 11 11 11 11 16 16 16 19 19
3 3 3 3 3 8 8 8 8 8 8 14 14 14 17 17 17 20
4 4 4 4 4 9 9 9 9 13 13 15 15 15 15 15 15
States
of
count
The cache block has not been used for the longest period of time!
LRU Algorithm: Replace the CB that has not been used for the longest
period of time (in the past).
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 6
Input cachesize or the command or address
The input number is equel to -1
Check the cache
Cache hit?
Update the time tableReplacement using LRU
Algorithm(update cache and time table)
Exityes
yes
no
no
print the cache and time table status
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 7
.data:cacheBlocks dd 32 dup(-1); hold the address
time dd 32 dup(-1); hold the count
cacheSize dd 32, 0; the size of cache
CPUAccess dd "%d", 0; the address that cpu access
count dd 0, 0; the current time
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 8
Input cachesize or the command or address
The input number is equel to -1
Check the cache
Cache hit?
Update the time table
Replacement using LRU Algorithm(update cache and time table)
Exityes
yes
no
no
print the cache and time table status
Part 1: check the cachesize
Start:
…
mov ECX, cacheSize
cmp ECX, -1
je exitprogram
jmp input
Part 2: check the CPUAccess
Input:
…
mov ECX, CPUAccess
cmp ECX, -1
je exitprogram
mov EAX, 0
jmp check
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 9
Input cachesize or the command or address
The input number is equel to -1
Check the cache
Cache hit?
Update the time tableReplacement using LRU
Algorithm(update cache and time table)
Exityes
yes
no
no
print the cache and time table status
Input:
…
mov EAX, 0
…
check:
cmp ECX, [EBP + EAX*4]
je hit
add EAX,1
cmp EAX, cacheSize
je replace
jmp check
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 10
4
3
2
1
Input:
…
mov EAX, 0
…
check:
cmp ECX, [EBP + EAX*4]
je hit
add EAX,1
cmp EAX, cacheSize
je replace
jmp check
cacheBlocks(cachesize = 4,cpu access(ECX) 2)
EBP + EAX*4
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 11
4
3
2
1
Input:
…
mov EAX, 0
…
check:
cmp ECX, [EBP + EAX*4]
je hit
add EAX,1
cmp EAX, cacheSize
je replace
jmp check
cacheBlocks(cachesize = 4,cpu access(ECX) 2)
EAX
ECX != 1
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 12
4
3
2
1
Input:
…
mov EAX, 0
…
check:
cmp ECX, [EBP + EAX*4]
je hit
add EAX,1
cmp EAX, cacheSize
je replace
jmp check
cacheBlocks(cachesize = 4,cpu access(ECX) 2)
EAX
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 13
4
3
2
1
Input:
…
mov EAX, 0
…
check:
cmp ECX, [EBP + EAX*4]
je hit
add EAX,1
cmp EAX, cacheSize
je replace
jmp check
cacheBlocks(cachesize = 4,cpu access(ECX) 2)
EAX
EAX!=4
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 14
4
3
2
1
Input:
…
mov EAX, 0
…
check:
cmp ECX, [EBP + EAX*4]
je hit
add EAX,1
cmp EAX, cacheSize
je replace
jmp check
cacheBlocks(cachesize = 4,cpu access(ECX) 2)
EAX
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 15
4
3
2
1
Input:
…
mov EAX, 0
…
check:
cmp ECX, [EBP + EAX*4]
je hit
add EAX,1
cmp EAX, cacheSize
je replace
jmp check
cacheBlocks(cachesize = 4,cpu access(ECX) 2)
EAX
ECX = 2
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 16
4
3
2
1
Input:
…
mov EAX, 0
…
check:
cmp ECX, [EBP + EAX*4]
je hit
add EAX,1
cmp EAX, cacheSize
je replace
jmp check
cacheBlocks(cachesize = 4,cpu access(ECX) 2)
EAX
Jump to hit
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 17
4
3
2
1
Input:
…
mov EAX, 0
…
check:
cmp ECX, [EBP + EAX*4]
je hit
add EAX,1
cmp EAX, cacheSize
je replace
jmp check
cacheBlocks(cachesize = 4,cpu access(ECX) 5)
EAX
ECX != 4
If CPU access(ECX) 5
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 18
4
3
2
1
Input:
…
mov EAX, 0
…
check:
cmp ECX, [EBP + EAX*4]
je hit
add EAX,1
cmp EAX, cacheSize
je replace
jmp check
cacheBlocks(cachesize = 4,cpu access(ECX) 5)EAX
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 19
4
3
2
1
Input:
…
mov EAX, 0
…
check:
cmp ECX, [EBP + EAX*4]
je hit
add EAX,1
cmp EAX, cacheSize
je replace
jmp check
cacheBlocks(cachesize = 4,cpu access(ECX) 5)EAX
EAX = 4
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 20
4
3
2
1
Input:
…
mov EAX, 0
…
check:
cmp ECX, [EBP + EAX*4]
je hit
add EAX,1
cmp EAX, cacheSize
je replace
jmp check
cacheBlocks(cachesize = 4,cpu access(ECX) 5)EAX
Jump to replace
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 21
Input cachesize or the command or address
The input number is equel to -1
Check the cache
Cache hit?
Update the time tableReplacement using LRU
Algorithm(update cache and time table)
Exityes
yes
no
no
print the cache and time table status
hit:
mov EBX ,count
mov [ESI + EAX*4], EBX
jmp printcachestatus
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 22
Input cachesize or the command or address
The input number is equel to -1
Check the cache
Cache hit?
Update the time tableReplacement using LRU
Algorithm(update cache and time table)
Exityes
yes
no
no
print the cache and time table status
replace:
mov EAX, 0
mov EDI, 0
call findLRU
mov EBX, CPUAccess
mov [EBP + EDI*4], EBX
mov EBX ,count
mov [ESI + EDI*4], EBX
jmp printcachestatus
findLRU:
mov EBX, [ESI + EDI*4]
add EAX, 1
cmp EBX, [ESI + EAX*4]
jg recordLRU
mov EBX, cacheSize
sub EBX, 1
cmp EAX, EBX
jne findLRU
ret
recordLRU:
mov EDI, EAX
mov EBX, cacheSize
dec EBX
cmp EAX, EBX
jne findLRU
ret
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 23
replace:
mov EAX, 0
mov EDI, 0
call findLRU
mov EBX, CPUAccess
mov [EBP + EDI*4], EBX
mov EBX ,count
mov [ESI + EDI*4], EBX
jmp printcachestatus
findLRU:
mov EBX, [ESI + EDI*4]
add EAX, 1
cmp EBX, [ESI + EAX*4]
jg recordLRU
mov EBX, cacheSize
sub EBX, 1
cmp EAX, EBX
jne findLRU
ret
recordLRU:
mov EDI, EAX
mov EBX, cacheSize
dec EBX
cmp EAX, EBX
jne findLRU
ret
54
55
3
63
cacheBlocks, count = 64, cpu access 5
4
3
2
1
Time table, count = 64
ESI + EAX*4 ESI + EDI*4
EBP + EDI*4EBP + EAX*4
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 24
replace:
mov EAX, 0
mov EDI, 0
call findLRU
mov EBX, CPUAccess
mov [EBP + EDI*4], EBX
mov EBX ,count
mov [ESI + EDI*4], EBX
jmp printcachestatus
findLRU:
mov EBX, [ESI + EDI*4]
add EAX, 1
cmp EBX, [ESI + EAX*4]
jg recordLRU
mov EBX, cacheSize
sub EBX, 1
cmp EAX, EBX
jne findLRU
ret
recordLRU:
mov EDI, EAX
mov EBX, cacheSize
dec EBX
cmp EAX, EBX
jne findLRU
ret
54
55
3
63
cacheBlocks, count = 64, cpu access 5
EAX EDI
EBX = 63
4
3
2
1
Time table, count = 64
EAX EDI
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 25
replace:
mov EAX, 0
mov EDI, 0
call findLRU
mov EBX, CPUAccess
mov [EBP + EDI*4], EBX
mov EBX ,count
mov [ESI + EDI*4], EBX
jmp printcachestatus
findLRU:
mov EBX, [ESI + EDI*4]
add EAX, 1
cmp EBX, [ESI + EAX*4]
jg recordLRU
mov EBX, cacheSize
sub EBX, 1
cmp EAX, EBX
jne findLRU
ret
recordLRU:
mov EDI, EAX
mov EBX, cacheSize
dec EBX
cmp EAX, EBX
jne findLRU
ret
54
55
3
63
cacheBlocks, count = 64, cpu access 5
EAX
EDI
4
3
2
1
Time table, count = 64
EAX
EDI
EBX = 63
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 26
replace:
mov EAX, 0
mov EDI, 0
call findLRU
mov EBX, CPUAccess
mov [EBP + EDI*4], EBX
mov EBX ,count
mov [ESI + EDI*4], EBX
jmp printcachestatus
findLRU:
mov EBX, [ESI + EDI*4]
add EAX, 1
cmp EBX, [ESI + EAX*4]
jg recordLRU
mov EBX, cacheSize
sub EBX, 1
cmp EAX, EBX
jne findLRU
ret
recordLRU:
mov EDI, EAX
mov EBX, cacheSize
dec EBX
cmp EAX, EBX
jne findLRU
ret
54
55
3
63
cacheBlocks, count = 64, cpu access 5
EDI
4
3
2
1
Time table, count = 64
EDI
EBX = 63
EBX > 3
EAX
EAX
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 27
replace:
mov EAX, 0
mov EDI, 0
call findLRU
mov EBX, CPUAccess
mov [EBP + EDI*4], EBX
mov EBX ,count
mov [ESI + EDI*4], EBX
jmp printcachestatus
findLRU:
mov EBX, [ESI + EDI*4]
add EAX, 1
cmp EBX, [ESI + EAX*4]
jg recordLRU
mov EBX, cacheSize
sub EBX, 1
cmp EAX, EBX
jne findLRU
ret
recordLRU:
mov EDI, EAX
mov EBX, cacheSize
dec EBX
cmp EAX, EBX
jne findLRU
ret
54
55
3
63
cacheBlocks, count = 64, cpu access 5
EDI
4
3
2
1
Time table, count = 64
EDI
Jump to record LRU
EAX
EAX
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 28
replace:
mov EAX, 0
mov EDI, 0
call findLRU
mov EBX, CPUAccess
mov [EBP + EDI*4], EBX
mov EBX ,count
mov [ESI + EDI*4], EBX
jmp printcachestatus
findLRU:
mov EBX, [ESI + EDI*4]
add EAX, 1
cmp EBX, [ESI + EAX*4]
jg recordLRU
mov EBX, cacheSize
sub EBX, 1
cmp EAX, EBX
jne findLRU
ret
recordLRU:
mov EDI, EAX
mov EBX, cacheSize
dec EBX
cmp EAX, EBX
jne findLRU
ret
54
55
3
63
cacheBlocks, count = 64, cpu access 5
EAX EDI
4
3
2
1
Time table, count = 64
EAX EDI
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 29
replace:
mov EAX, 0
mov EDI, 0
call findLRU
mov EBX, CPUAccess
mov [EBP + EDI*4], EBX
mov EBX ,count
mov [ESI + EDI*4], EBX
jmp printcachestatus
findLRU:
mov EBX, [ESI + EDI*4]
add EAX, 1
cmp EBX, [ESI + EAX*4]
jg recordLRU
mov EBX, cacheSize
sub EBX, 1
cmp EAX, EBX
jne findLRU
ret
recordLRU:
mov EDI, EAX
mov EBX, cacheSize
dec EBX
cmp EAX, EBX
jne findLRU
ret
54
55
3
63
cacheBlocks, count = 64, cpu access 5
EAX EDI
4
3
2
1
Time table, count = 64
EBX = 4
EAX EDI
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 30
replace:
mov EAX, 0
mov EDI, 0
call findLRU
mov EBX, CPUAccess
mov [EBP + EDI*4], EBX
mov EBX ,count
mov [ESI + EDI*4], EBX
jmp printcachestatus
findLRU:
mov EBX, [ESI + EDI*4]
add EAX, 1
cmp EBX, [ESI + EAX*4]
jg recordLRU
mov EBX, cacheSize
sub EBX, 1
cmp EAX, EBX
jne findLRU
ret
recordLRU:
mov EDI, EAX
mov EBX, cacheSize
dec EBX
cmp EAX, EBX
jne findLRU
ret
54
55
3
63
cacheBlocks, count = 64, cpu access 5
EAX EDI
4
3
2
1
Time table, count = 64
EBX = 3
EAX EDI
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 31
replace:
mov EAX, 0
mov EDI, 0
call findLRU
mov EBX, CPUAccess
mov [EBP + EDI*4], EBX
mov EBX ,count
mov [ESI + EDI*4], EBX
jmp printcachestatus
findLRU:
mov EBX, [ESI + EDI*4]
add EAX, 1
cmp EBX, [ESI + EAX*4]
jg recordLRU
mov EBX, cacheSize
sub EBX, 1
cmp EAX, EBX
jne findLRU
ret
recordLRU:
mov EDI, EAX
mov EBX, cacheSize
dec EBX
cmp EAX, EBX
jne findLRU
ret
54
55
3
63
cacheBlocks, count = 64, cpu access 5
EAX EDI
4
3
2
1
Time table, count = 64
EBX = 3
EAX = 1
EBX != 1
EAX EDI
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 32
replace:
mov EAX, 0
mov EDI, 0
call findLRU
mov EBX, CPUAccess
mov [EBP + EDI*4], EBX
mov EBX ,count
mov [ESI + EDI*4], EBX
jmp printcachestatus
findLRU:
mov EBX, [ESI + EDI*4]
add EAX, 1
cmp EBX, [ESI + EAX*4]
jg recordLRU
mov EBX, cacheSize
sub EBX, 1
cmp EAX, EBX
jne findLRU
ret
recordLRU:
mov EDI, EAX
mov EBX, cacheSize
dec EBX
cmp EAX, EBX
jne findLRU
ret
54
55
3
63
cacheBlocks, count = 64, cpu access 5
EAX EDI
4
3
2
1
Time table, count = 64
Jump to findLRU
EAX EDI
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 33
replace:
mov EAX, 0
mov EDI, 0
call findLRU
mov EBX, CPUAccess
mov [EBP + EDI*4], EBX
mov EBX ,count
mov [ESI + EDI*4], EBX
jmp printcachestatus
findLRU:
mov EBX, [ESI + EDI*4]
add EAX, 1
cmp EBX, [ESI + EAX*4]
jg recordLRU
mov EBX, cacheSize
sub EBX, 1
cmp EAX, EBX
jne findLRU
ret
recordLRU:
mov EDI, EAX
mov EBX, cacheSize
dec EBX
cmp EAX, EBX
jne findLRU
ret
54
55
3
63
cacheBlocks, count = 64, cpu access 5
EAX EDI
4
3
2
1
Time table, count = 64
EAX
EBX = 3
EDI
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 34
replace:
mov EAX, 0
mov EDI, 0
call findLRU
mov EBX, CPUAccess
mov [EBP + EDI*4], EBX
mov EBX ,count
mov [ESI + EDI*4], EBX
jmp printcachestatus
findLRU:
mov EBX, [ESI + EDI*4]
add EAX, 1
cmp EBX, [ESI + EAX*4]
jg recordLRU
mov EBX, cacheSize
sub EBX, 1
cmp EAX, EBX
jne findLRU
ret
recordLRU:
mov EDI, EAX
mov EBX, cacheSize
dec EBX
cmp EAX, EBX
jne findLRU
ret
54
55
3
63
cacheBlocks, count = 64, cpu access 5
EAX
EDI
4
3
2
1
Time table, count = 64
EAX
EBX = 3
EDI
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 35
replace:
mov EAX, 0
mov EDI, 0
call findLRU
mov EBX, CPUAccess
mov [EBP + EDI*4], EBX
mov EBX ,count
mov [ESI + EDI*4], EBX
jmp printcachestatus
findLRU:
mov EBX, [ESI + EDI*4]
add EAX, 1
cmp EBX, [ESI + EAX*4]
jg recordLRU
mov EBX, cacheSize
sub EBX, 1
cmp EAX, EBX
jne findLRU
ret
recordLRU:
mov EDI, EAX
mov EBX, cacheSize
dec EBX
cmp EAX, EBX
jne findLRU
ret
54
55
3
63
cacheBlocks, count = 64, cpu access 5
EAX
EDI
4
3
2
1
Time table, count = 64
EAX
EBX = 3 THEN EBX < 55
Not jmp
EDI
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 36
replace:
mov EAX, 0
mov EDI, 0
call findLRU
mov EBX, CPUAccess
mov [EBP + EDI*4], EBX
mov EBX ,count
mov [ESI + EDI*4], EBX
jmp printcachestatus
findLRU:
mov EBX, [ESI + EDI*4]
add EAX, 1
cmp EBX, [ESI + EAX*4]
jg recordLRU
mov EBX, cacheSize
sub EBX, 1
cmp EAX, EBX
jne findLRU
ret
recordLRU:
mov EDI, EAX
mov EBX, cacheSize
dec EBX
cmp EAX, EBX
jne findLRU
ret
54
55
3
63
cacheBlocks, count = 64, cpu access 5
EAX
EDI
4
3
2
1
Time table, count = 64
EAX
EBX = 4
EDI
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 37
replace:
mov EAX, 0
mov EDI, 0
call findLRU
mov EBX, CPUAccess
mov [EBP + EDI*4], EBX
mov EBX ,count
mov [ESI + EDI*4], EBX
jmp printcachestatus
findLRU:
mov EBX, [ESI + EDI*4]
add EAX, 1
cmp EBX, [ESI + EAX*4]
jg recordLRU
mov EBX, cacheSize
sub EBX, 1
cmp EAX, EBX
jne findLRU
ret
recordLRU:
mov EDI, EAX
mov EBX, cacheSize
dec EBX
cmp EAX, EBX
jne findLRU
ret
54
55
3
63
cacheBlocks, count = 64, cpu access 5
EAX
EDI
4
3
2
1
Time table, count = 64
EAX
EBX = 3
EDI
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 38
replace:
mov EAX, 0
mov EDI, 0
call findLRU
mov EBX, CPUAccess
mov [EBP + EDI*4], EBX
mov EBX ,count
mov [ESI + EDI*4], EBX
jmp printcachestatus
findLRU:
mov EBX, [ESI + EDI*4]
add EAX, 1
cmp EBX, [ESI + EAX*4]
jg recordLRU
mov EBX, cacheSize
sub EBX, 1
cmp EAX, EBX
jne findLRU
ret
recordLRU:
mov EDI, EAX
mov EBX, cacheSize
dec EBX
cmp EAX, EBX
jne findLRU
ret
54
55
3
63
cacheBlocks, count = 64, cpu access 5
EAX
EDI
4
3
2
1
Time table, count = 64
EAX
EBX = 3 EAX=2 SO
EBX != EAX
EDI
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 39
replace:
mov EAX, 0
mov EDI, 0
call findLRU
mov EBX, CPUAccess
mov [EBP + EDI*4], EBX
mov EBX ,count
mov [ESI + EDI*4], EBX
jmp printcachestatus
findLRU:
mov EBX, [ESI + EDI*4]
add EAX, 1
cmp EBX, [ESI + EAX*4]
jg recordLRU
mov EBX, cacheSize
sub EBX, 1
cmp EAX, EBX
jne findLRU
ret
recordLRU:
mov EDI, EAX
mov EBX, cacheSize
dec EBX
cmp EAX, EBX
jne findLRU
ret
54
55
3
63
cacheBlocks, count = 64, cpu access 5
EAX
EDI
4
3
2
1
Time table, count = 64
EAX
EBX = 3
EDI
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 40
replace:
mov EAX, 0
mov EDI, 0
call findLRU
mov EBX, CPUAccess
mov [EBP + EDI*4], EBX
mov EBX ,count
mov [ESI + EDI*4], EBX
jmp printcachestatus
findLRU:
mov EBX, [ESI + EDI*4]
add EAX, 1
cmp EBX, [ESI + EAX*4]
jg recordLRU
mov EBX, cacheSize
sub EBX, 1
cmp EAX, EBX
jne findLRU
ret
recordLRU:
mov EDI, EAX
mov EBX, cacheSize
dec EBX
cmp EAX, EBX
jne findLRU
ret
54
55
3
63
cacheBlocks, count = 64, cpu access 5
EAX
EDI
4
3
2
1
Time table, count = 64
EAX
EBX = 3
EDI
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 41
replace:
mov EAX, 0
mov EDI, 0
call findLRU
mov EBX, CPUAccess
mov [EBP + EDI*4], EBX
mov EBX ,count
mov [ESI + EDI*4], EBX
jmp printcachestatus
findLRU:
mov EBX, [ESI + EDI*4]
add EAX, 1
cmp EBX, [ESI + EAX*4]
jg recordLRU
mov EBX, cacheSize
sub EBX, 1
cmp EAX, EBX
jne findLRU
ret
recordLRU:
mov EDI, EAX
mov EBX, cacheSize
dec EBX
cmp EAX, EBX
jne findLRU
ret
54
55
3
63
cacheBlocks, count = 64, cpu access 5
EAX
EDI
4
3
2
1
Time table, count = 64
EAX
EBX = 3 THEN EBX < 54
Not jmp
EDI
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 42
replace:
mov EAX, 0
mov EDI, 0
call findLRU
mov EBX, CPUAccess
mov [EBP + EDI*4], EBX
mov EBX ,count
mov [ESI + EDI*4], EBX
jmp printcachestatus
findLRU:
mov EBX, [ESI + EDI*4]
add EAX, 1
cmp EBX, [ESI + EAX*4]
jg recordLRU
mov EBX, cacheSize
sub EBX, 1
cmp EAX, EBX
jne findLRU
ret
recordLRU:
mov EDI, EAX
mov EBX, cacheSize
dec EBX
cmp EAX, EBX
jne findLRU
ret
54
55
3
63
cacheBlocks, count = 64, cpu access 5
EAX
EDI
4
3
2
1
Time table, count = 64
EAX
EBX = 4
EDI
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 43
replace:
mov EAX, 0
mov EDI, 0
call findLRU
mov EBX, CPUAccess
mov [EBP + EDI*4], EBX
mov EBX ,count
mov [ESI + EDI*4], EBX
jmp printcachestatus
findLRU:
mov EBX, [ESI + EDI*4]
add EAX, 1
cmp EBX, [ESI + EAX*4]
jg recordLRU
mov EBX, cacheSize
sub EBX, 1
cmp EAX, EBX
jne findLRU
ret
recordLRU:
mov EDI, EAX
mov EBX, cacheSize
dec EBX
cmp EAX, EBX
jne findLRU
ret
54
55
3
63
cacheBlocks, count = 64, cpu access 5
EAX
EDI
4
3
2
1
Time table, count = 64
EAX
EBX = 3
EDI
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 44
replace:
mov EAX, 0
mov EDI, 0
call findLRU
mov EBX, CPUAccess
mov [EBP + EDI*4], EBX
mov EBX ,count
mov [ESI + EDI*4], EBX
jmp printcachestatus
findLRU:
mov EBX, [ESI + EDI*4]
add EAX, 1
cmp EBX, [ESI + EAX*4]
jg recordLRU
mov EBX, cacheSize
sub EBX, 1
cmp EAX, EBX
jne findLRU
ret
recordLRU:
mov EDI, EAX
mov EBX, cacheSize
dec EBX
cmp EAX, EBX
jne findLRU
ret
54
55
3
63
cacheBlocks, count = 64,cpu access 5
EAX
EDI
4
3
2
1
Time table, count = 64
EAX
EDI
EBX = 3 EAX=3 SO
RET
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 45
replace:
mov EAX, 0
mov EDI, 0
call findLRU
mov EBX, CPUAccess
mov [EBP + EDI*4], EBX
mov EBX ,count
mov [ESI + EDI*4], EBX
jmp printcachestatus
findLRU:
mov EBX, [ESI + EDI*4]
add EAX, 1
cmp EBX, [ESI + EAX*4]
jg recordLRU
mov EBX, cacheSize
sub EBX, 1
cmp EAX, EBX
jne findLRU
ret
recordLRU:
mov EDI, EAX
mov EBX, cacheSize
dec EBX
cmp EAX, EBX
jne findLRU
ret
54
55
64
63
cacheBlocks, count = 64, cpu access 5
EAX
EDI
4
3
5
1
Time table, count = 64
EAX
EDI
EBX = 5
EBX = 64
LRU Algorithm
CSCI2510 Tut09: Associative mapping in MASM 46
Input cachesize or the command or address
The input number is equel to -1
Check the cache
Cache hit?
Update the time tableReplacement using LRU Algorithm(update cache and time table)
Exityes
yes
no
no
print the cache and time table status
printcachestatus:
mov EDI, 0
invoke crt_printf, addr stateFormat
call printstate
invoke crt_printf, addr countFormat
mov EDI, 0
call printcount
invoke crt_printf, addr endFormat
jmp input
printstate:
mov EAX, [EBP + EDI*4]
invoke crt_printf, addr outputFormat, EAX
add EDI, 1
cmp EDI, cacheSize
jne printstate
ret
printcount:
mov EAX, [ESI + EDI*4]
invoke crt_printf, addr outputFormat, EAX
add EDI, 1
cmp EDI, cacheSize
jne printcount
ret
Associative mapping implementation
CSCI2510 Tut09: Associative mapping in MASM 47
First-In-First-Out Algorithm
CSCI2510 Tut09: Associative mapping in MASM 48
7 7 7 7 7 3 3 3 3 3 3 3 3 3 2 2 2 2 2 2
0 0 0 0 0 0 4 4 4 4 4 4 4 4 4 4 7 7 7
1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0
2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1
States
of
cache
1 1 1 1 1 6 6 6 6 6 6 6 6 6 15 15 15 15 15 15
2 2 2 2 2 2 8 8 8 8 8 8 8 8 8 8 18 18 18
3 3 3 3 3 3 3 3 11 11 11 11 11 11 11 11 11 11
4 4 4 4 4 4 4 4 4 4 14 14 14 14 14 14 14
States
of
count
The cache block has arrived for the longest period of time!
First-In-First-Out Algorithm: Replace the CB that has arrived for the longest period
of time (in the past)
First-In-First-Out Algorithm
CSCI2510 Tut09: Associative mapping in MASM 49
Input cachesize or the command or address
The input number is equel to -1
Check the cache
Cache hit?
Replacement using FIFO Algorithm(update cache and time table)
Exityes
yes
no
no
print the cache and time table status
First-In-First-Out Algorithm
CSCI2510 Tut09: Associative mapping in MASM 50
Assignment3
CSCI2510 Tut09: Associative mapping in MASM 51
• Implement the FIFO Algorithm
• Fill the five code segments:
check, hit, replace, find first,
recordfirst
• Don’t change the start, input and
Output(printstate/printcachestatus/
printcount) code segments!!!
Summary
• LRU Algorithm
• First-In-First-Out Algorithm
52CSCI2510 Tut09: Associative mapping in MASM
