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hardware.py
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hardware.py
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import re
import random
from utilities import print_register, print_register_dump, print_memory_word, int_to_signed_32
# Hardware modules
class Register:
"""
set_data: Set input of the register
set_write: Set the write signal to 1
read: Read value from the register
clock: Set input of the register to the value of the register
------
Note that without .set_write(), .clock() will not save the input value
"""
def __init__(self):
self.data_in = 0
self.write = 0
self.data = 0
def set_data(self, d):
self.data_in = d
def set_write(self, w = 1):
self.write = w
def read(self):
return self.data
def clock(self):
if (self.write != 0):
self.data = self.data_in
class RegisterFile:
def __init__(self):
self.data = [0]*32
self.read_register_1 = 0
self.read_register_2 = 0
self.write_register = 0
self.write_data = 0
self.read_data_1 = 0
self.read_data_2 = 0
self.regwrite = 0
self.verbose = 0
def set_read_registers(self, r1, r2):
self.read_register_1 = r1 & 0x1F
self.read_register_2 = r2 & 0x1F
def set_write_register(self, wr):
self.write_register = wr & 0x1F
def set_write_data(self, d):
self.write_data = d
def set_regwrite(self, d = 1):
self.regwrite = d
def get_read_data_1(self):
if (self.verbose > 0):
print_register ("RF_R1", self.read_register_1, self.data[self.read_register_1])
return self.data[self.read_register_1]
def get_read_data_2(self):
if (self.verbose > 0):
print_register ("RF_R2", self.read_register_2, self.data[self.read_register_2])
return self.data[self.read_register_2]
def clock(self):
if (self.regwrite != 0):
if (self.write_register > 0):
self.data[self.write_register] = self.write_data
if (self.verbose > 0):
print_register("RF_W", self.write_register, self.write_data)
def set_verbose(self, v):
self.verbose = v
def dump(self):
for i in range(len(self.data)):
print_register_dump(i, self.data[i])
if ((i & 3) == 3):
print("");
class Memory:
"""
set_address: Set the address of I/O operation
set_data: Set input data
set_memread: Set the memory read signal to 1
set_memwrite: Set the memory write signal to 1
get_data: Read value from out
clock: Set input of the register to the value of the register
run: To execute read/write memory
------
Note that without .set_memwrite(), .run() will not save the input value
"""
def __init__(self):
self.data = {}
self.address = 0
self.data_in = 0
self.data_out = 0
self.read = 0
self.write = 0
self.verbose = 0
def set_address(self, addr):
self.address = addr
def set_data(self, d):
self.data_in = d
def set_memread(self, v = 1):
self.read = v
def set_memwrite(self, v = 1):
self.write = v
def get_data(self):
return self.data_out
def run(self):
if (self.read == 0 and self.write == 0):
return
if (self.address < 0 or self.address >= 0x80000000):
print("Error: Membery address 0x{0:08X} ({0:d}) is too large.".format(self.address))
if ((self.address & 3) != 0):
print("Error: Membery address 0x{0:08X} ({0:d}) is not aligned.".format(self.address))
if (self.read != 0):
if (self.address in self.data):
self.data_out = self.data[self.address]
else:
self.data_out = 0
if (self.verbose > 0):
print_memory_word ("MEM_R", self.address, self.data_out)
elif (self.write != 0):
self.data[self.address] = self.data_in
if (self.verbose > 0):
print_memory_word ("MEM_W", self.address, self.data_in)
def get_starting_address(self):
if (len(self.data) == 0):
return 0
return min(self.data)
# return min(self.data.keys())
def get_ending_address(self):
if (len(self.data) == 0):
return 0
return max(self.data)
# return max(self.data.keys())
def set_verbose(self, v):
self.verbose = v
def dump(self):
for addr in sorted(self.data.keys()):
print_memory_word ("MEM_D", addr, self.data[addr])
MAXINT32 = 2147483647
MININT32 = -2147483648
def ALU_32 (n1, n2, alu_control):
"""
Input 0000: And
Input 0001: Or
Input 0010: Addition
Input 0110: Substraction
Input 0111: Set Less Then
Output:
result: Calculated result of the ALU
zero: Zero signal of ALU(1 if result is zero)
"""
result = 0
if (alu_control == 0):
result = int_to_signed_32(n1 & n2)
elif (alu_control == 1):
result = int_to_signed_32(n1 | n2)
elif (alu_control == 2):
result = (n1 + n2)
if (result > MAXINT32 or result < MININT32):
raise ValueError("Arithmetic overflow from addition %d." % result)
elif (alu_control == 6):
result = (n1 - n2)
if (result > MAXINT32 or result < MININT32):
raise ValueError("Arithmetic overflow from subtraction %d." % result)
elif (alu_control == 7):
result = 1 if (n1 < n2) else 0
"""
n1 &= 0xFFFFFFFF
n2 &= 0xFFFFFFFF
sign1 = (n1 >> 31) & 1
sign2 = (n2 >> 31) & 1
if (sign1 != sign2):
result = 1 if (sign1 > sign2) else 0
else:
result = 1 if (n1 < n2) else 0
"""
# can check overflow here
# result >> 31 should be 0 or -1
zero = 1 if (result == 0) else 0
return (result, zero)
def MUX_2_1(o_0, o_1, control):
"""
2-1 MUX
"""
return o_1 if control else o_0
def AND_2(d0, d1):
"""
Two-input AND gate.
"""
return (d0 & d1)
if __name__ == '__main__':
test = 'MEM'
print ("Test " + test)
if (test == 'RF'):
RF = RegisterFile()
RF.set_verbose(1)
RF.set_regwrite(1)
for i in range(32):
RF.set_write_register(i)
v = (int((random.random() - 0.5) * 0x100000000))
RF.set_write_data(v)
RF.clock()
RF.dump()
elif (test == 'MEM'):
MEM = Memory()
MEM.set_verbose(1)
MEM.dump()
MEM.set_memwrite(1)
MEM.set_memread(0)
a = 0x40240;
for i in range(16):
MEM.set_address(a)
v = (int((random.random() - 0.5) * 0x100000000))
MEM.set_data(v)
MEM.run()
a += 4
MEM.dump()
from utilities import println_int
println_int ("Staring address", MEM.get_starting_address())
println_int ("Ending address", MEM.get_ending_address())