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import pin
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# 一个指令周期
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FETCH = [
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# 把 pc(当前是0) 的值 输出到偏移地址寄存器中,
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pin.PC_OUT | pin.MAR_IN,
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# 内存根据上方修改后的偏移地址寄存器找到数据输出到总线上, IR 写入, 给PC 增加1
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pin.RAM_OUT | pin.IR_IN | pin.PC_INC,
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pin.PC_OUT | pin.MAR_IN,
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pin.RAM_OUT | pin.DST_IN | pin.PC_INC,
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pin.PC_OUT | pin.MAR_IN,
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pin.RAM_OUT | pin.SRC_IN | pin.PC_INC,
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]
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MOV = 0 << pin.ADDR_2_SHIFT | pin.ADDR_2 # 左移 留出来操作数位 然后再加上 ADDR_2的标志
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ADD = 1 << pin.ADDR_2_SHIFT | pin.ADDR_2
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SUB = 2 << pin.ADDR_2_SHIFT | pin.ADDR_2
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CMP = 3 << pin.ADDR_2_SHIFT | pin.ADDR_2
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AND = 4 << pin.ADDR_2_SHIFT | pin.ADDR_2
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OR = 5 << pin.ADDR_2_SHIFT | pin.ADDR_2
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XOR = 6 << pin.ADDR_2_SHIFT | pin.ADDR_2
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INC = 0 << pin.ADDR_1_SHIFT | pin.ADDR_1
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DEC = 1 << pin.ADDR_1_SHIFT | pin.ADDR_1
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NOT = 2 << pin.ADDR_1_SHIFT | pin.ADDR_1
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JMP = 3 << pin.ADDR_1_SHIFT | pin.ADDR_1
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JO = 4 << pin.ADDR_1_SHIFT | pin.ADDR_1 # 溢出跳转
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JNO = 5 << pin.ADDR_1_SHIFT | pin.ADDR_1 # 不溢出跳转
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JZ = 6 << pin.ADDR_1_SHIFT | pin.ADDR_1 # 如果为0跳转
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JNZ = 7 << pin.ADDR_1_SHIFT | pin.ADDR_1 # 非0跳转
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JP = 8 << pin.ADDR_1_SHIFT | pin.ADDR_1 # 奇数跳转
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JNP = 9 << pin.ADDR_1_SHIFT | pin.ADDR_1 # 偶数跳转
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PUSH = 10 << pin.ADDR_1_SHIFT | pin.ADDR_1
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POP = 11 << pin.ADDR_1_SHIFT | pin.ADDR_1
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CALL = 12 << pin.ADDR_1_SHIFT | pin.ADDR_1
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INT = 13 << pin.ADDR_1_SHIFT | pin.ADDR_1 # 中断
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NOP = 0b0
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RET = 0b1 # 中断
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IRET = 0b10 # 中断返回
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STI = 0b11 # 打开中断
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CLI = 0b100 # 关闭中断
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HLT = 0b11_1111
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INSTRUCTIONS = {
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2: {
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MOV: { # 0b10000000
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# mov X任意寄存器, 5, 如果是mov a, 5 这个指令对应的前3个内存地址就是 1000_01_00 00000008(dst中保存的a寄存器编号是8) 00000101(src保存的数值是5, 等下SRC_OUT会输出到总线上)
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(pin.AM_REG, pin.AM_INS): [ # 1000_01_00 这是IR寄存器上保存的指令
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# 目的任意寄存器的控制线的编号X, 保存在了DST寄存器中中, 输出到读写控制器控制使X寄存器打开写
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# 写入 SRC寄存器中保存的立即数
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# 这是控制读写寄存器操作寄存器控制器的值
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pin.DST_W | pin.SRC_OUT,
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],
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(pin.AM_REG, pin.AM_REG): [ # mov a, b
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pin.DST_W | pin.SRC_R
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# SRC_R 和 SRC_OUT的区别是:
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# - SRC_R 是被读写控制器控制的表示, SRC_R内保存的值是一个寄存器编号, 此时把这个编号传到 寄存器控制器中然后把这个指定的寄存器数据传到总线上
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# - SRC_OUT 是把直接SRC寄存器中的数据输出到总线
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],
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(pin.AM_REG, pin.AM_DIR): [ # mov a, [0x5]
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pin.SRC_OUT | pin.MAR_IN, # 把0x5从src寄存器, 通过偏移地址寄存器传到 内存控制器中
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pin.DST_W | pin.RAM_OUT # 把上面传到内存控制器中的地址, 输出到DST_W中的a寄存器中
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],
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(pin.AM_REG, pin.AM_RAM): [ # mov a, [b]
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pin.SRC_R | pin.MAR_IN, # 把SRC_R中的b寄存器编号, 通过偏移地址寄存器MAR传到 内存控制器中
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pin.DST_W | pin.RAM_OUT
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],
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(pin.AM_DIR, pin.AM_INS): [ # mov [0x2f], 5
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pin.DST_OUT | pin.MAR_IN, # 把0x2f这个地址, 从dst寄存器, 通过偏移地址寄存器传到 内存控制器中
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pin.SRC_OUT | pin.RAM_IN
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],
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(pin.AM_DIR, pin.AM_REG): [ # mov [0x0], a
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pin.DST_OUT | pin.MAR_IN,
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pin.SRC_R | pin.RAM_IN
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],
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(pin.AM_DIR, pin.AM_DIR): [ # mov [0x0], [0x2f]
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pin.SRC_OUT | pin.MAR_IN,
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pin.T1_IN | pin.RAM_OUT,
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pin.DST_OUT | pin.MAR_IN,
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pin.T1_OUT | pin.RAM_IN
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],
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(pin. AM_DIR, pin.AM_RAM): [ # mov [0x0], [a]
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pin.SRC_R | pin.MAR_IN,
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pin.T1_IN | pin.RAM_OUT,
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pin.DST_OUT | pin.MAR_IN,
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pin.T1_OUT | pin.RAM_IN
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],
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(pin.AM_RAM, pin.AM_INS): [ # mov [a], 0x5
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pin.DST_R | pin.MAR_IN,
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pin.SRC_OUT | pin.RAM_IN
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],
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(pin.AM_RAM, pin.AM_REG): [ # mov [a], c
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pin.DST_R | pin.MAR_IN,
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pin.SRC_R | pin.RAM_IN
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],
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(pin.AM_RAM, pin.AM_DIR): [ # mov [a], [0x5]
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pin.SRC_OUT | pin.MAR_IN,
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pin.T1_IN | pin.RAM_OUT,
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pin.DST_R | pin.MAR_IN,
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pin.T1_OUT | pin.RAM_IN
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],
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(pin.AM_RAM, pin.AM_RAM): [ # mov [a], [b]
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pin.SRC_R | pin.MAR_IN,
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pin.T1_IN | pin.RAM_OUT,
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pin.DST_R | pin.MAR_IN,
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pin.T1_OUT | pin.RAM_IN
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],
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},
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ADD: {
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(pin.AM_REG, pin.AM_INS): [ # add b, 5
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pin.DST_R | pin.A_IN, # 将b寄存器内的值 转移到 A寄存器
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pin.SRC_OUT | pin.B_IN, # 将 src中的值 转移到 b寄存器
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pin.OP_ADD | pin.ALU_OUT | pin.DST_W | pin.ALU_PSW # 打开alu输出计算之后 写入到 DST中的编号为 b寄存器中, 并记录 psw
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],
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(pin.AM_REG, pin.AM_REG): [ # add a, b
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pin.DST_R | pin.A_IN,
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pin.SRC_R | pin.B_IN,
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pin.OP_ADD | pin.ALU_OUT | pin.DST_W | pin.ALU_PSW
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],
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},
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SUB: {
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(pin.AM_REG, pin.AM_INS): [ # sub b, 5
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pin.DST_R | pin.A_IN, # 将b寄存器内的值 转移到 A寄存器
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pin.SRC_OUT | pin.B_IN, # 将 src中的值 转移到 b寄存器
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pin.OP_SUB | pin.ALU_OUT | pin.DST_W | pin.ALU_PSW
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],
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(pin.AM_REG, pin.AM_REG): [ # sub a, b
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pin.DST_R | pin.A_IN,
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pin.SRC_R | pin.B_IN,
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pin.OP_SUB | pin.ALU_OUT | pin.DST_W | pin.ALU_PSW
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],
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},
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CMP: {
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(pin.AM_REG, pin.AM_INS): [ # cmp b, 5
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pin.DST_R | pin.A_IN, # 将b寄存器内的值 转移到 A寄存器
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pin.SRC_OUT | pin.B_IN, # 将 src中的值 转移到 b寄存器
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pin.OP_SUB | pin.ALU_PSW # 相减, 只更新状态字即可
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],
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(pin.AM_REG, pin.AM_REG): [ # cmp a, b
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pin.DST_R | pin.A_IN,
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pin.SRC_R | pin.B_IN,
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pin.OP_SUB | pin.ALU_PSW
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],
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},
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AND: {
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(pin.AM_REG, pin.AM_INS): [ # and b, 5
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pin.DST_R | pin.A_IN, # 将b寄存器内的值 转移到 A寄存器
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pin.SRC_OUT | pin.B_IN, # 将 src中的值 转移到 b寄存器
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pin.OP_AND | pin.ALU_OUT | pin.DST_W | pin.ALU_PSW
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],
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(pin.AM_REG, pin.AM_REG): [ # and a, b
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pin.DST_R | pin.A_IN,
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pin.SRC_R | pin.B_IN,
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pin.OP_AND | pin.ALU_OUT | pin.DST_W | pin.ALU_PSW
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],
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},
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OR: {
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(pin.AM_REG, pin.AM_INS): [ # or b, 5
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pin.DST_R | pin.A_IN, # 将b寄存器内的值 转移到 A寄存器
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pin.SRC_OUT | pin.B_IN, # 将 src中的值 转移到 b寄存器
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pin.OP_OR | pin.ALU_OUT | pin.DST_W | pin.ALU_PSW
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],
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(pin.AM_REG, pin.AM_REG): [ # or a, b
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pin.DST_R | pin.A_IN,
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pin.SRC_R | pin.B_IN,
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pin.OP_OR | pin.ALU_OUT | pin.DST_W | pin.ALU_PSW
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],
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},
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XOR: {
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(pin.AM_REG, pin.AM_INS): [ # xor b, 5
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pin.DST_R | pin.A_IN, # 将b寄存器内的值 转移到 A寄存器
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pin.SRC_OUT | pin.B_IN, # 将 src中的值 转移到 b寄存器
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pin.OP_XOR | pin.ALU_OUT | pin.DST_W | pin.ALU_PSW
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],
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(pin.AM_REG, pin.AM_REG): [ # xor a, b
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pin.DST_R | pin.A_IN,
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pin.SRC_R | pin.B_IN,
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pin.OP_XOR | pin.ALU_OUT | pin.DST_W | pin.ALU_PSW
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],
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},
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},
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1: {
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INC: {
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pin.AM_REG: [ # inc b
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pin.DST_R | pin.A_IN,
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pin.OP_INC | pin.ALU_OUT | pin.DST_W | pin.ALU_PSW
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],
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},
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DEC: {
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pin.AM_REG: [ # dec b
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pin.DST_R | pin.A_IN,
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pin.OP_DEC | pin.ALU_OUT | pin.DST_W | pin.ALU_PSW
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],
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},
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NOT: {
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pin.AM_REG: [ # not b
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pin.DST_R | pin.A_IN,
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pin.OP_NOT | pin.ALU_OUT | pin.DST_W | pin.ALU_PSW
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],
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},
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JMP: { # jmp 0x5 跳转到立即数的地址
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pin.AM_INS: [
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pin.DST_OUT | pin.PC_IN,
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]
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},
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JO: {
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pin.AM_INS: [
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pin.DST_OUT | pin.PC_IN,
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]
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},
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JNO: {
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pin.AM_INS: [
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pin.DST_OUT | pin.PC_IN,
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]
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},
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JZ: {
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pin.AM_INS: [
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pin.DST_OUT | pin.PC_IN,
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]
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},
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JNZ: {
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pin.AM_INS: [
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pin.DST_OUT | pin.PC_IN,
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]
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},
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JP: {
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pin.AM_INS: [
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pin.DST_OUT | pin.PC_IN,
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]
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},
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JNP: {
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pin.AM_INS: [
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pin.DST_OUT | pin.PC_IN,
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]
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},
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PUSH: {
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pin.AM_INS: [ # push 5
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# 计算得到新的栈顶地址
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pin.SP_OUT | pin.A_IN,
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pin.OP_DEC | pin.ALU_OUT | pin.SP_IN, # 替换sp为新的sp
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pin.SP_OUT | pin.MAR_IN, # 修改 mar偏移寄存器
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# 修改 msr段地址寄存器
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pin.SS_OUT | pin.MSR_IN,
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# 根据 msr段地址 和mar偏移地址 控制内存写
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pin.RAM_IN | pin.DST_OUT,
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# 修改msr即可, mar会被pc修改
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pin.MSR_IN | pin.CS_OUT,
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],
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pin.AM_REG: [ # push b
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# 计算得到新的栈顶地址
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pin.SP_OUT | pin.A_IN,
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pin.OP_DEC | pin.ALU_OUT | pin.SP_IN, # 替换sp为新的sp
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pin.SP_OUT | pin.MAR_IN, # 修改 mar偏移寄存器
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# 修改 msr段地址寄存器
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pin.SS_OUT | pin.MSR_IN,
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# 根据 msr段地址 和mar偏移地址 控制内存写
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pin.RAM_IN | pin.DST_R,
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# 修改msr即可, mar会被pc修改
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pin.MSR_IN | pin.CS_OUT,
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]
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},
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POP: {
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pin.AM_REG: [ # pop d
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# 修改段地址和偏移地址
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pin.SP_OUT | pin.MAR_IN,
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pin.SS_OUT | pin.MSR_IN,
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# 读出内存数据到 dst_w
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pin.RAM_OUT | pin.DST_W,
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# 对sp增加1
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pin.SP_OUT | pin.A_IN,
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pin.OP_INC | pin.ALU_OUT | pin.SP_IN,
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# 恢复 msr
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pin.CS_OUT | pin.MSR_IN,
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]
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},
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CALL: {
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pin.AM_INS: [ # call 0x5
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# 先把当前pc压栈
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pin.SP_OUT | pin.A_IN,
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pin.OP_DEC | pin.ALU_OUT | pin.SP_IN, # sp减去1回写到sp
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pin.SP_OUT | pin.MAR_IN, # 修改 mar偏移寄存器
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# 修改 msr段地址寄存器
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pin.SS_OUT | pin.MSR_IN,
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# 根据 msr段地址 和mar偏移地址 控制内存写, 把当前PC 压栈
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pin.RAM_IN | pin.PC_OUT,
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# 修改PC为 DST
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pin.DST_OUT | pin.PC_IN,
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# 修改msr即可, mar会被pc修改
|
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pin.MSR_IN | pin.CS_OUT,
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],
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pin.AM_REG: [ # call b
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pin.SP_OUT | pin.A_IN,
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pin.OP_DEC | pin.ALU_OUT | pin.SP_IN,
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pin.SP_OUT | pin.MAR_IN,
|
|
|
|
|
# 修改 msr段地址寄存器
|
|
|
|
|
pin.SS_OUT | pin.MSR_IN,
|
|
|
|
|
|
|
|
|
|
# 当前pc压栈
|
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pin.RAM_IN | pin.PC_OUT,
|
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|
# 修改PC为 DST
|
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pin.DST_R, pin.PC_IN,
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pin.MSR_IN | pin.CS_OUT,
|
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|
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|
]
|
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|
},
|
|
|
|
|
INT: {
|
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pin.AM_INS: [ # int 0x5 触发5号中断
|
|
|
|
|
# 先把当前pc压栈
|
|
|
|
|
pin.SP_OUT | pin.A_IN,
|
|
|
|
|
pin.OP_DEC | pin.ALU_OUT | pin.SP_IN, # sp减去1回写到sp
|
|
|
|
|
|
|
|
|
|
pin.SP_OUT | pin.MAR_IN, # 修改 mar偏移寄存器
|
|
|
|
|
# 修改 msr段地址寄存器
|
|
|
|
|
pin.SS_OUT | pin.MSR_IN,
|
|
|
|
|
|
|
|
|
|
# 根据 msr段地址 和mar偏移地址 控制内存写, 把当前PC 压栈
|
|
|
|
|
pin.RAM_IN | pin.PC_OUT,
|
|
|
|
|
|
|
|
|
|
# 修改PC为 DST
|
|
|
|
|
pin.DST_OUT | pin.PC_IN,
|
|
|
|
|
|
|
|
|
|
# 修改msr即可, mar会被pc修改
|
|
|
|
|
pin.MSR_IN | pin.CS_OUT,
|
|
|
|
|
|
|
|
|
|
# 进入中断处理函数之前, 需要关闭中断
|
|
|
|
|
pin.ALU_PSW | pin.ALU_CLI
|
|
|
|
|
],
|
|
|
|
|
pin.AM_REG: [ # call b
|
|
|
|
|
pin.SP_OUT | pin.A_IN,
|
|
|
|
|
pin.OP_DEC | pin.ALU_OUT | pin.SP_IN,
|
|
|
|
|
|
|
|
|
|
pin.SP_OUT | pin.MAR_IN,
|
|
|
|
|
# 修改 msr段地址寄存器
|
|
|
|
|
pin.SS_OUT | pin.MSR_IN,
|
|
|
|
|
|
|
|
|
|
# 当前pc压栈
|
|
|
|
|
pin.RAM_IN | pin.PC_OUT,
|
|
|
|
|
# 修改PC为 DST
|
|
|
|
|
pin.DST_R, pin.PC_IN,
|
|
|
|
|
|
|
|
|
|
pin.MSR_IN | pin.CS_OUT,
|
|
|
|
|
|
|
|
|
|
# 进入中断处理函数之前, 需要关闭中断
|
|
|
|
|
pin.ALU_PSW | pin.ALU_CLI
|
|
|
|
|
]
|
|
|
|
|
},
|
|
|
|
|
},
|
|
|
|
|
0: {
|
|
|
|
|
NOP: [
|
|
|
|
|
pin.CYC,
|
|
|
|
|
],
|
|
|
|
|
HLT: [
|
|
|
|
|
pin.HLT,
|
|
|
|
|
],
|
|
|
|
|
RET: [
|
|
|
|
|
# 修改段地址和偏移地址
|
|
|
|
|
pin.SP_OUT | pin.MAR_IN,
|
|
|
|
|
pin.SS_OUT | pin.MSR_IN,
|
|
|
|
|
|
|
|
|
|
# 直接把栈顶的值读到PC(这个值保存的事call的时候, PC的值)
|
|
|
|
|
pin.RAM_OUT | pin.PC_IN,
|
|
|
|
|
|
|
|
|
|
# 对sp增加1
|
|
|
|
|
pin.SP_OUT | pin.A_IN,
|
|
|
|
|
pin.OP_INC | pin.ALU_OUT | pin.SP_IN,
|
|
|
|
|
|
|
|
|
|
# 恢复 msr
|
|
|
|
|
pin.CS_OUT | pin.MSR_IN,
|
|
|
|
|
|
|
|
|
|
],
|
|
|
|
|
IRET: [
|
|
|
|
|
# 修改段地址和偏移地址
|
|
|
|
|
pin.SP_OUT | pin.MAR_IN,
|
|
|
|
|
pin.SS_OUT | pin.MSR_IN,
|
|
|
|
|
|
|
|
|
|
# 直接把栈顶的值读到PC(这个值保存的事call的时候, PC的值)
|
|
|
|
|
pin.RAM_OUT | pin.PC_IN,
|
|
|
|
|
|
|
|
|
|
# 对sp增加1
|
|
|
|
|
pin.SP_OUT | pin.A_IN,
|
|
|
|
|
pin.OP_INC | pin.ALU_OUT | pin.SP_IN,
|
|
|
|
|
|
|
|
|
|
# 恢复 msr
|
|
|
|
|
pin.CS_OUT | pin.MSR_IN,
|
|
|
|
|
|
|
|
|
|
# 恢复中断
|
|
|
|
|
pin.ALU_PSW | pin.ALU_STI
|
|
|
|
|
],
|
|
|
|
|
STI: [
|
|
|
|
|
pin.ALU_PSW | pin.ALU_STI
|
|
|
|
|
],
|
|
|
|
|
CLI: [
|
|
|
|
|
pin.ALU_PSW | pin.ALU_CLI
|
|
|
|
|
]
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
if __name__ == "__main__":
|
|
|
|
|
print(FETCH)
|
