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-rw-r--r--rtl/ed25519_worker.v299
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+//------------------------------------------------------------------------------
+//
+// ed25519_uop_worker.v
+// -----------------------------------------------------------------------------
+// Ed25519 uOP Worker.
+//
+// Authors: Pavel Shatov
+//
+// Copyright (c) 2018, NORDUnet A/S
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// - Redistributions of source code must retain the above copyright notice,
+// this list of conditions and the following disclaimer.
+//
+// - Redistributions in binary form must reproduce the above copyright notice,
+// this list of conditions and the following disclaimer in the documentation
+// and/or other materials provided with the distribution.
+//
+// - Neither the name of the NORDUnet nor the names of its contributors may be
+// used to endorse or promote products derived from this software without
+// specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+//------------------------------------------------------------------------------
+
+module ed25519_worker
+(
+ clk, rst_n,
+ ena, rdy,
+ uop_offset
+);
+
+
+ //
+ // Microcode Header
+ //
+`include "ed25519_uop.v"
+
+
+ //
+ // Ports
+ //
+ input clk; // system clock
+ input rst_n; // active-low async reset
+
+ input ena; // enable input
+ output rdy; // ready output
+
+ input [UOP_ADDR_WIDTH-1:0] uop_offset; // starting offset
+
+
+ //
+ // Constants
+ //
+ localparam integer OPERAND_NUM_WORDS = 8; // 256 bits -> 8 x 32-bit words
+ localparam integer WORD_COUNTER_WIDTH = 3; // 0..7 -> 3 bits
+
+
+ //
+ // FSM
+ //
+ localparam [1:0] FSM_STATE_IDLE = 2'b00;
+ localparam [1:0] FSM_STATE_FETCH = 2'b01;
+ localparam [1:0] FSM_STATE_DECODE = 2'b10;
+ localparam [1:0] FSM_STATE_BUSY = 2'b11;
+
+ reg [1:0] fsm_state = FSM_STATE_IDLE;
+ reg [1:0] fsm_state_next;
+
+
+ //
+ // Microcode
+ //
+ reg [UOP_ADDR_WIDTH-1:0] uop_addr;
+ wire [UOP_DATA_WIDTH-1:0] uop_data;
+
+ wire [4:0] uop_data_opcode = uop_data[1 + 3*6 +: 5];
+ wire uop_data_banks = uop_data[0 + 3*6 +: 1];
+ wire [5:0] uop_data_operand_src1 = uop_data[0 + 2*6 +: 6];
+ wire [5:0] uop_data_operand_src2 = uop_data[0 + 1*6 +: 6];
+ wire [5:0] uop_data_operand_dst = uop_data[0 + 0*6 +: 6];
+
+ wire uop_data_opcode_is_stop = uop_data_opcode[4];
+ wire uop_data_opcode_is_copy = uop_data_opcode[0];
+
+ ed25519_microcode microcode
+ (
+ .clk (clk),
+ .addr (uop_addr),
+ .data (uop_data)
+ );
+
+
+ //
+ // Microcode Address Increment Logic
+ //
+ always @(posedge clk)
+ //
+ if (fsm_state_next == FSM_STATE_FETCH)
+ uop_addr <= (fsm_state == FSM_STATE_IDLE) ? uop_offset : uop_addr + 1'b1;
+
+
+ //
+ // Multi-Word Mover
+ //
+ reg mw_mover_ena = 1'b0;
+ wire mw_mover_rdy;
+
+ wire [WORD_COUNTER_WIDTH-1:0] mw_mover_x_addr;
+ wire [WORD_COUNTER_WIDTH-1:0] mw_mover_y_addr;
+ wire [ 32-1:0] mw_mover_x_din;
+ wire [ 32-1:0] mw_mover_y_dout;
+ wire mw_mover_y_wren;
+
+ mw_mover #
+ (
+ .WORD_COUNTER_WIDTH (WORD_COUNTER_WIDTH),
+ .OPERAND_NUM_WORDS (OPERAND_NUM_WORDS)
+ )
+ mw_mover_inst
+ (
+ .clk (clk),
+ .rst_n (rst_n),
+ .ena (mw_mover_ena),
+ .rdy (mw_mover_rdy),
+ .x_addr (mw_mover_x_addr),
+ .y_addr (mw_mover_y_addr),
+ .y_wren (mw_mover_y_wren),
+ .x_din (mw_mover_x_din),
+ .y_dout (mw_mover_y_dout)
+ );
+
+
+ //
+ // uOP Trigger Logic
+ //
+ always @(posedge clk)
+ //
+ if (fsm_state == FSM_STATE_DECODE) begin
+ mw_mover_ena <= uop_data_opcode_is_copy;
+ end else begin
+ mw_mover_ena <= 1'b0;
+ end
+
+
+ //
+ // uOP Completion Detector
+ //
+ reg fsm_exit_from_busy;
+
+ always @* begin
+ //
+ fsm_exit_from_busy = 0;
+ //
+ if (uop_data_opcode_is_copy) fsm_exit_from_busy = ~mw_mover_ena & mw_mover_rdy;
+ //
+ end
+
+
+
+ //
+ // Banks
+ //
+ reg [ 2:0] banks_src1_addr;
+ reg [ 2:0] banks_src2_addr;
+ reg [ 2:0] banks_dst_addr;
+
+ reg banks_dst_wren;
+
+ reg [31:0] banks_dst_din;
+
+ wire [31:0] banks_src1_dout;
+ wire [31:0] banks_src2_dout;
+
+ ed25519_banks banks
+ (
+ .clk (clk),
+
+ .banks (uop_data_banks),
+
+ .src1_operand (uop_data_operand_src1),
+ .src2_operand (uop_data_operand_src2),
+ .dst_operand (uop_data_operand_dst),
+
+ .src1_addr (banks_src1_addr),
+ .src2_addr (banks_src2_addr),
+ .dst_addr (banks_dst_addr),
+
+ .dst_wren (banks_dst_wren),
+
+ .src1_dout (banks_src1_dout),
+ .src2_dout (banks_src2_dout),
+
+ .dst_din (banks_dst_din)
+ );
+
+ assign mw_mover_x_din = banks_src1_dout;
+
+ always @*
+ //
+ case (uop_data_opcode)
+ //
+ UOP_OPCODE_COPY: begin
+ //
+ banks_src1_addr = mw_mover_x_addr;
+ banks_src2_addr = 'bX;
+ //
+ banks_dst_addr = mw_mover_y_addr;
+ //
+ banks_dst_wren = mw_mover_y_wren;
+ //
+ banks_dst_din = mw_mover_y_dout;
+ //
+ end
+ //
+ //UOP_OPCODE_ADD: d
+ //UOP_OPCODE_SUB: d
+ //UOP_OPCODE_MUL: d
+ //
+ default: begin
+ //
+ banks_src1_addr = 'bX;
+ banks_src2_addr = 'bX;
+ //
+ banks_dst_addr = 'bX;
+ //
+ banks_dst_wren = 'b0;
+ //
+ banks_dst_din = 'bX;
+ end
+ //
+ endcase
+
+ //addr
+ //wren
+ //dout
+ //din
+
+
+ //
+ // FSM Process
+ //
+ always @(posedge clk or negedge rst_n)
+ //
+ if (rst_n == 1'b0) fsm_state <= FSM_STATE_IDLE;
+ else fsm_state <= fsm_state_next;
+
+
+ //
+ // FSM Transition Logic
+ //
+ always @* begin
+ //
+ fsm_state_next = FSM_STATE_IDLE;
+ //
+ case (fsm_state)
+ FSM_STATE_IDLE: fsm_state_next = ena ? FSM_STATE_FETCH : FSM_STATE_IDLE;
+ FSM_STATE_FETCH: fsm_state_next = FSM_STATE_DECODE;
+ FSM_STATE_DECODE: fsm_state_next = uop_data_opcode_is_stop ? FSM_STATE_IDLE : FSM_STATE_BUSY;
+ FSM_STATE_BUSY: fsm_state_next = fsm_exit_from_busy ? FSM_STATE_FETCH : FSM_STATE_BUSY;
+ endcase
+ //
+ end
+
+
+ //
+ // Ready Flag Logic
+ //
+ reg rdy_reg = 1'b1;
+ assign rdy = rdy_reg;
+
+ always @(posedge clk or negedge rst_n)
+ //
+ if (rst_n == 1'b0) rdy_reg <= 1'b1;
+ else case (fsm_state)
+ FSM_STATE_IDLE: rdy_reg <= ~ena;
+ FSM_STATE_DECODE: rdy_reg <= uop_data_opcode_is_stop;
+ endcase
+
+
+endmodule
+
+
+//------------------------------------------------------------------------------
+// End-of-File
+//------------------------------------------------------------------------------