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--! @mainpage
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--! @mainpage
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--! <H1>Main document of the OpenCPU32 project</H1>\n
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--! <H1>Main document of the OpenCPU32 project</H1>\n
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--! <H2>Features</H2>
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--! <H2>Features</H2>
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--! Use standard library
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--! Use standard library
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library IEEE;
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library ieee;
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use IEEE.STD_LOGIC_1164.all;
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use ieee.STD_LOGIC_1164.all;
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use ieee.std_logic_unsigned.all;
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use ieee.std_logic_arith.all;
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package pkgOpenCPU32 is
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package pkgOpenCPU32 is
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--! Declare constants, enums, functions used by the design
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--! Declare constants, enums, functions used by the design
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constant nBits : integer := 32;
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constant nBits : integer := 32;
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constant instructionSize : integer := nBits;
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--! Number of general registers (r0..r15)
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--! Number of general registers (r0..r15)
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constant numGenRegs : integer := 16;
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constant numGenRegs : integer := 16;
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type aluOps is (alu_pass, alu_passB, alu_sum, alu_sub, alu_inc, alu_dec, alu_mul, alu_or, alu_and,
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type aluOps is (alu_pass, alu_passB, alu_sum, alu_sub, alu_inc, alu_dec, alu_mul, alu_or, alu_and,
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alu_xor, alu_not, alu_shfLt, alu_shfRt, alu_roLt, alu_roRt);
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alu_xor, alu_not, alu_shfLt, alu_shfRt, alu_roLt, alu_roRt);
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type typeEnDis is (enable, disable);
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type typeEnDis is (enable, disable);
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type generalRegisters is (r0,r1,r2,r3,r4,r5,r6,r7,r8,r9,r10,r11,r12,r13,r14,r15);
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type generalRegisters is (r0,r1,r2,r3,r4,r5,r6,r7,r8,r9,r10,r11,r12,r13,r14,r15);
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type dpMuxInputs is (fromMemory, fromImediate, fromRegFileA, fromRegFileB, fromAlu);
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type dpMuxInputs is (fromMemory, fromImediate, fromRegFileA, fromRegFileB, fromAlu);
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type controlUnitStates is (initial, fetch, decode, execute, executing);
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function reg2Num (a: generalRegisters) return integer;
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function reg2Num (a: generalRegisters) return integer;
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function Num2reg (a: integer) return generalRegisters;
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function Num2reg (a: integer) return generalRegisters;
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function muxPos( a: dpMuxInputs) return std_logic_vector;
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function muxPos( a: dpMuxInputs) return std_logic_vector;
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-- Opcodes
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subtype opcodes is std_logic_vector(5 downto 0);
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-- Each instruction will take 32 bits
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-- Tutorial on using records.. (http://vhdlguru.blogspot.com.br/2010/02/arrays-and-records-in-vhdl.html)
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type instructionType is record
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opcode : std_logic_vector(5 downto 0);
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reg1 : std_logic_vector(3 downto 0);
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reg2 : std_logic_vector(3 downto 0);
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imm : std_logic_vector(15 downto 0); -- Max imediate value (16 bits)
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end record;
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-- Data movement
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constant mov_reg : opcodes := conv_std_logic_vector(0,6); -- Move data between registers
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constant mov_val : opcodes := conv_std_logic_vector(1,6); -- Move data from imediate value to a register
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constant stom_reg : opcodes := conv_std_logic_vector(2,6); -- Store a value in memory coming from a register
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constant stom_val : opcodes := conv_std_logic_vector(3,6); -- Store a value in memory coming from imediate
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constant ld_reg : opcodes := conv_std_logic_vector(4,6); -- Load a value from memory into a register
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constant ld_val : opcodes := conv_std_logic_vector(5,6); -- Load a value from memoru into another address in memory
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-- Jump instructions
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constant jmp_val : opcodes := conv_std_logic_vector(6,6); -- Jump (PC <= Val)
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constant jmpr_val : opcodes := conv_std_logic_vector(7,6); -- Jump relative (PC <= PC + Val)
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constant jz_val : opcodes := conv_std_logic_vector(8,6); -- Jump if zero
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constant jzr_val : opcodes := conv_std_logic_vector(9,6); -- Jump if zero relative
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constant jnz_val : opcodes := conv_std_logic_vector(10,6); -- Jump if not zero
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constant jnzr_val : opcodes := conv_std_logic_vector(11,6); -- Jump if not zero relative
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constant call_reg : opcodes := conv_std_logic_vector(12,6); -- Jump to address (Save return value on the stack
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constant ret_reg : opcodes := conv_std_logic_vector(13,6); -- Pop return value from the stack and jump to it
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-- Logical instructions
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constant and_reg : opcodes := conv_std_logic_vector(14,6); -- And between to registers
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constant and_val : opcodes := conv_std_logic_vector(15,6); -- And between register and imediate
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constant or_reg : opcodes := conv_std_logic_vector(16,6); -- Or between to registers
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constant or_val : opcodes := conv_std_logic_vector(17,6); -- Or between register and imediate
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constant xor_reg : opcodes := conv_std_logic_vector(18,6); -- Xor between to registers
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constant xor_val : opcodes := conv_std_logic_vector(19,6); -- Xor between register and imediate
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constant not_reg : opcodes := conv_std_logic_vector(20,6); -- Not on register
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constant shl_reg : opcodes := conv_std_logic_vector(21,6); -- Shift left register (one shift)
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constant shr_reg : opcodes := conv_std_logic_vector(22,6); -- Shift right register (one shift)
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constant rol_reg : opcodes := conv_std_logic_vector(23,6); -- Rotate left register (one rotation)
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constant ror_reg : opcodes := conv_std_logic_vector(24,6); -- Rotate right register (one rotation)
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constant sbit_reg : opcodes := conv_std_logic_vector(25,6); -- Set bit pointed by register
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constant cbit_reg : opcodes := conv_std_logic_vector(26,6); -- Clear bit pointed by register
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-- Math operations instructions (unsigned)
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constant add_reg : opcodes := conv_std_logic_vector(27,6); -- Add to registers
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constant add_val : opcodes := conv_std_logic_vector(28,6); -- Add register and a imediate value
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constant sub_reg : opcodes := conv_std_logic_vector(29,6); -- Subtract to registers
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constant sub_val : opcodes := conv_std_logic_vector(30,6); -- Subtract register and a imediate value
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constant inc_reg : opcodes := conv_std_logic_vector(31,6); -- Increment register
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constant dec_reg : opcodes := conv_std_logic_vector(32,6); -- Decrement register
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-- Control opcodes
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constant nop : opcodes := conv_std_logic_vector(31,6); -- Nop...
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constant halt : opcodes := conv_std_logic_vector(32,6); -- Halt processor
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end pkgOpenCPU32;
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end pkgOpenCPU32;
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--! Define functions or procedures
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--! Define functions or procedures
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package body pkgOpenCPU32 is
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package body pkgOpenCPU32 is
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