-- The Potato Processor - A simple processor for FPGAs
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-- The Potato Processor - A simple processor for FPGAs
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-- (c) Kristian Klomsten Skordal 2014 - 2015 <kristian.skordal@wafflemail.net>
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-- (c) Kristian Klomsten Skordal 2014 - 2015 <kristian.skordal@wafflemail.net>
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-- Report bugs and issues on <https://github.com/skordal/potato/issues>
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-- Report bugs and issues on <http://opencores.org/project,potato,bugtracker>
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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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package pp_types is
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package pp_types is
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--! Type used for register addresses.
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--! Type used for register addresses.
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subtype register_address is std_logic_vector(4 downto 0);
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subtype register_address is std_logic_vector(4 downto 0);
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--! The available ALU operations.
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--! The available ALU operations.
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type alu_operation is (
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type alu_operation is (
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ALU_AND, ALU_OR, ALU_XOR,
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ALU_AND, ALU_OR, ALU_XOR,
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ALU_SLT, ALU_SLTU,
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ALU_SLT, ALU_SLTU,
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ALU_ADD, ALU_SUB,
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ALU_ADD, ALU_SUB,
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ALU_SRL, ALU_SLL, ALU_SRA,
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ALU_SRL, ALU_SLL, ALU_SRA,
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ALU_NOP
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ALU_NOP
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);
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);
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--! Types of branches.
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--! Types of branches.
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type branch_type is (
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type branch_type is (
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BRANCH_NONE, BRANCH_JUMP, BRANCH_JUMP_INDIRECT, BRANCH_CONDITIONAL, BRANCH_SRET
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BRANCH_NONE, BRANCH_JUMP, BRANCH_JUMP_INDIRECT, BRANCH_CONDITIONAL, BRANCH_SRET
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);
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);
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--! Source of an ALU operand.
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--! Source of an ALU operand.
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type alu_operand_source is (
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type alu_operand_source is (
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ALU_SRC_REG, ALU_SRC_IMM, ALU_SRC_SHAMT, ALU_SRC_PC, ALU_SRC_PC_NEXT, ALU_SRC_NULL, ALU_SRC_CSR
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ALU_SRC_REG, ALU_SRC_IMM, ALU_SRC_SHAMT, ALU_SRC_PC, ALU_SRC_PC_NEXT, ALU_SRC_NULL, ALU_SRC_CSR
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);
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);
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--! Type of memory operation:
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--! Type of memory operation:
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type memory_operation_type is (
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type memory_operation_type is (
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MEMOP_TYPE_NONE, MEMOP_TYPE_INVALID, MEMOP_TYPE_LOAD, MEMOP_TYPE_LOAD_UNSIGNED, MEMOP_TYPE_STORE
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MEMOP_TYPE_NONE, MEMOP_TYPE_INVALID, MEMOP_TYPE_LOAD, MEMOP_TYPE_LOAD_UNSIGNED, MEMOP_TYPE_STORE
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);
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);
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-- Determines if a memory operation is a load:
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-- Determines if a memory operation is a load:
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function memop_is_load(input : in memory_operation_type) return boolean;
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function memop_is_load(input : in memory_operation_type) return boolean;
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--! Size of a memory operation:
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--! Size of a memory operation:
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type memory_operation_size is (
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type memory_operation_size is (
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MEMOP_SIZE_BYTE, MEMOP_SIZE_HALFWORD, MEMOP_SIZE_WORD
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MEMOP_SIZE_BYTE, MEMOP_SIZE_HALFWORD, MEMOP_SIZE_WORD
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);
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);
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end package pp_types;
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end package pp_types;
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package body pp_types is
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package body pp_types is
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function memop_is_load(input : in memory_operation_type) return boolean is
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function memop_is_load(input : in memory_operation_type) return boolean is
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begin
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begin
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return (input = MEMOP_TYPE_LOAD or input = MEMOP_TYPE_LOAD_UNSIGNED);
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return (input = MEMOP_TYPE_LOAD or input = MEMOP_TYPE_LOAD_UNSIGNED);
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end function memop_is_load;
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end function memop_is_load;
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end package body pp_types;
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end package body pp_types;
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