1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
from components.ijvm import ijvm
class Ram:
def __init__(self,components,size):
self.data=dict()
self.lastAddr=size-1
self.c=components
def loadRamFile(self,filepath):
"""
Load a Ram file into self.data
"""
data=dict()
addr=0
f=open(filepath,"r")
for line in f.readlines():
line=line.rstrip() # remove \n
if line in ijvm:
data[addr]=int(ijvm[line])
else:
try:
value=int(line,0)
except:
raise ValueError("Invalide RAM entry: Address {} value {}".format(addr,line))
if value>255:
raise ValueError("Ram contain values that does not fit in a byte: value {} at address {}".format(value,addr))
data[addr]=value
addr+=1
f.close()
self.data=data
def write(self):
"""
Write data to memory based Mic-1 architecture
"""
addr=self.c["MAR"]*4 # Don't forget MAR address 32bits block of memory
if addr>self.lastAddr:
raise ValueError("You get out of the ram by trying to set a value at address {}, max address is {}".format(addr,self.lastAddr))
#### Little endian ####
self.data[addr]=self.c["MDR"] & 0xFF
self.data[addr+1]=self.c["MDR"] & 0xFF00
self.data[addr+2]=self.c["MDR"] & 0xFF0000
self.data[addr+3]=self.c["MDR"] & 0xFF000000
def read(self):
"""
Read data from memory based Mic-1 architecture
"""
addr=self.c["MAR"]*4 # Don't forget MAR address 32bits block of memory
value=None
try:
#### Little endian ####
value=(self.data[addr+3]<<24)|(self.data[addr+2]<<16)|(self.data[addr+1]<<8)|self.data[addr]
except:
if addr>self.lastAddr:
raise ValueError("You get out of the ram by trying to get value at address {}, max address is {}".format(addr,self.lastAddr))
if(value==None):
return(0)
return(value)
def fetch(self):
"""
Fetch next byte from memory based Mic-1 architecture
"""
addr=self.c["PC"]
value=None
try:
value=self.data[addr]
except:
if addr>self.lastAddr:
raise ValueError("You get out of the ram by trying to get value at address {}, max address is {}".format(addr,self.lastAddr))
if(value==None):
return(0)
return(value)
def dump(self):
"""
Simple dump helper
"""
for key,value in self.data.items():
#print("{}:{}".format(key,bin(value)[2:]))
print("{}:{}".format(key,value))
def dumpRange(self,start,end,step):
"""
Another dump helper
"""
for i in range(start,end+1,step):
try:
print("{}:{}".format(i,self.data[i]))
except:
print("{}:0".format(i))
|
