94 lines
2.4 KiB
Python
94 lines
2.4 KiB
Python
from components.ijvm import ijvm
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class Ram:
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def __init__(self,components,size):
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self.data=dict()
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self.lastAddr=size-1
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self.c=components
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def loadRamFile(self,filepath):
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"""
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Load a Ram file into self.data
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"""
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data=dict()
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addr=0
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f=open(filepath,"r")
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for line in f.readlines():
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line=line.rstrip() # remove \n
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if line in ijvm:
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data[addr]=int(ijvm[line])
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else:
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try:
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value=int(line,0)
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except:
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raise ValueError("Invalide RAM entry: Address {} value {}".format(addr,line))
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if value>255:
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raise ValueError("Ram contain values that does not fit in a byte: value {} at address {}".format(value,addr))
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data[addr]=value
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addr+=1
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f.close()
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self.data=data
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def write(self):
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"""
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Write data to memory based Mic-1 architecture
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"""
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addr=self.c["MAR"]*4 # Don't forget MAR address 32bits block of memory
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if addr>self.lastAddr:
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raise ValueError("You get out of the ram by trying to set a value at address {}, max address is {}".format(addr,self.lastAddr))
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#### Little endian ####
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self.data[addr]=self.c["MDR"] & 0xFF
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self.data[addr+1]=self.c["MDR"] & 0xFF00
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self.data[addr+2]=self.c["MDR"] & 0xFF0000
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self.data[addr+3]=self.c["MDR"] & 0xFF000000
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def read(self):
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"""
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Read data from memory based Mic-1 architecture
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"""
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addr=self.c["MAR"]*4 # Don't forget MAR address 32bits block of memory
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value=None
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try:
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#### Little endian ####
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value=(self.data[addr+3]<<24)|(self.data[addr+2]<<16)|(self.data[addr+1]<<8)|self.data[addr]
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except:
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if addr>self.lastAddr:
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raise ValueError("You get out of the ram by trying to get value at address {}, max address is {}".format(addr,self.lastAddr))
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if(value==None):
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return(0)
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return(value)
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def fetch(self):
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"""
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Fetch next byte from memory based Mic-1 architecture
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"""
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addr=self.c["PC"]
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value=None
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try:
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value=self.data[addr]
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except:
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if addr>self.lastAddr:
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raise ValueError("You get out of the ram by trying to get value at address {}, max address is {}".format(addr,self.lastAddr))
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if(value==None):
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return(0)
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return(value)
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def dump(self):
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"""
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Simple dump helper
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"""
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for key,value in self.data.items():
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#print("{}:{}".format(key,bin(value)[2:]))
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print("{}:{}".format(key,value))
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def dumpRange(self,start,end,step):
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"""
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Another dump helper
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"""
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for i in range(start,end+1,step):
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try:
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print("{}:{}".format(i,self.data[i]))
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except:
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print("{}:0".format(i))
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