File size: 4,364 Bytes
cd886b3 | 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 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 | #!/usr/bin/python3
import enum
import sys
class Micro_ops(enum.IntEnum):
NOP = 0x0000,
APB_PSEL = 0x0001,
APB_WRITE = 0x0002,
LOAD_ISR = 0x0004,
MEM_ACCESS = 0x0008,
ALU_FLAG = 0x0010,
LOAD_PC = 0x0020,
SYS_LOAD = 0x0040
LOADINS = [Micro_ops.APB_PSEL,
Micro_ops.APB_PSEL | Micro_ops.LOAD_ISR,
Micro_ops.NOP]
STORE = [Micro_ops.MEM_ACCESS | Micro_ops.APB_WRITE,
Micro_ops.APB_PSEL | Micro_ops.MEM_ACCESS | Micro_ops.APB_WRITE,
Micro_ops.APB_PSEL | Micro_ops.MEM_ACCESS | Micro_ops.APB_WRITE,
Micro_ops.NOP]
LOAD = [Micro_ops.MEM_ACCESS,
Micro_ops.APB_PSEL | Micro_ops.MEM_ACCESS,
Micro_ops.APB_PSEL | Micro_ops.MEM_ACCESS,
Micro_ops.NOP]
SYSTEM = [Micro_ops.SYS_LOAD,
Micro_ops.APB_PSEL | Micro_ops.SYS_LOAD,
Micro_ops.APB_PSEL | Micro_ops.SYS_LOAD,
Micro_ops.NOP,
Micro_ops.APB_PSEL | Micro_ops.SYS_LOAD | Micro_ops.APB_WRITE,
Micro_ops.APB_PSEL | Micro_ops.SYS_LOAD | Micro_ops.APB_WRITE,
Micro_ops.NOP]
LOADINS_NO_EN = [Micro_ops.APB_PSEL | Micro_ops.LOAD_ISR,
Micro_ops.NOP]
STORE_NO_EN = [Micro_ops.MEM_ACCESS | Micro_ops.APB_WRITE,
Micro_ops.APB_PSEL | Micro_ops.MEM_ACCESS | Micro_ops.APB_WRITE,
Micro_ops.NOP]
LOAD_NO_EN = [Micro_ops.MEM_ACCESS,
Micro_ops.APB_PSEL | Micro_ops.MEM_ACCESS,
Micro_ops.NOP]
SYSTEM_NO_EN = [Micro_ops.SYS_LOAD,
Micro_ops.APB_PSEL | Micro_ops.SYS_LOAD,
Micro_ops.NOP,
Micro_ops.APB_PSEL | Micro_ops.SYS_LOAD | Micro_ops.APB_WRITE,
Micro_ops.NOP]
ALU = [Micro_ops.ALU_FLAG,
Micro_ops.NOP]
JALR = [Micro_ops.LOAD_PC,
Micro_ops.NOP]
BRANCH = [Micro_ops.ALU_FLAG | Micro_ops.LOAD_PC,
Micro_ops.NOP]
def print_err(*args, **kwargs):
print(*args, file=sys.stderr, **kwargs)
def help():
print_err("Usage: ", sys.argv[0], "[-n] [-h] [output file]]")
print_err("Options:")
print_err("-h: Prints this help message")
print_err("-n: Generate microcode without the enable signal")
print_err("default output file: microcode.hex")
print_err("default output file with [-n]: microcode_no_en.hex")
def gen_opcodes(index, microcode,loadins):
ret = ""
if(len(microcode) > 16-len(loadins)):
print_err("Too many microcode instructions")
return
ofs = 1 if index == 0 else len(loadins)
for i in range(16):
if(i >= len(microcode)):
code = 0
else:
#top 4 bits are the opcode index next 4 bits are the microcode index
#last 8 bits are the microcode
code = microcode[i] | (((i+ofs)*0x100) + (index*0x1000))
# end jump to start
if(i == len(microcode)-1):
code = microcode[i]
ret += "{:04x}\n".format(code)
if index == 0:
for _ in range(len(loadins)-1):
ret += "0"*4 + "\n"
return ret
def gen_microcode(file_name="microop.hex"):
hex_str = ""
file = open(file_name, "w")
hex_str += gen_opcodes(0, LOADINS, LOADINS)
hex_str += gen_opcodes(1, STORE, LOADINS)
hex_str += gen_opcodes(2, LOAD, LOADINS)
hex_str += gen_opcodes(3, SYSTEM, LOADINS)
hex_str += gen_opcodes(4, ALU, LOADINS)
hex_str += gen_opcodes(5, JALR, LOADINS)
hex_str += gen_opcodes(6, BRANCH, LOADINS)
# pad out the rest of the microcode
# this allows for 7 opcodes
# the last opcode is a jump to the start
for _ in range(16-(len(LOADINS)-1)):
hex_str += "0"*4 + "\n"
file.write(hex_str)
file.close()
def gen_microcode_no_en(file_name="microop_no_en.hex"):
hex_str = ""
file = open(file_name, "w")
hex_str += gen_opcodes(0, LOADINS_NO_EN, LOADINS_NO_EN)
hex_str += gen_opcodes(1, STORE_NO_EN, LOADINS_NO_EN)
hex_str += gen_opcodes(2, LOAD_NO_EN, LOADINS_NO_EN)
hex_str += gen_opcodes(3, SYSTEM_NO_EN, LOADINS_NO_EN)
hex_str += gen_opcodes(4, ALU, LOADINS_NO_EN)
hex_str += gen_opcodes(5, JALR, LOADINS_NO_EN)
hex_str += gen_opcodes(6, BRANCH, LOADINS_NO_EN)
# pad out the rest of the microcode
# this allows for 7 opcodes
# the last opcode is a jump to the start
for _ in range(16-(len(LOADINS_NO_EN)-1)):
hex_str += ("0"*4) + "\n"
file.write(hex_str)
file.close()
def main():
if len(sys.argv) == 3:
if sys.argv[1] == "-n":
gen_microcode_no_en(sys.argv[2])
elif sys.argv[2] == "-n":
gen_microcode_no_en(sys.argv[1])
else:
help()
elif len(sys.argv) == 2:
if sys.argv[1] == "-n":
gen_microcode_no_en()
elif sys.argv[1][0] == "-":
help()
else:
gen_microcode(sys.argv[1])
elif len(sys.argv) == 1:
gen_microcode()
else:
help()
if __name__ == "__main__":
main()
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