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109 lines
3.3 KiB
Systemverilog
109 lines
3.3 KiB
Systemverilog
///////////////////////////////////////////
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// datapath.sv
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//
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// Written: Ross Thompson
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// email: ross1728@gmail.com
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// Created: November 9, 2019
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//
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// Purpose: Finds the current function or global assembly label based on PCE.
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//
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// A component of the Wally configurable RISC-V project.
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//
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// Copyright (C) 2021 Harvey Mudd College & Oklahoma State University
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation
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// files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy,
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// modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software
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// is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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// BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
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// OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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///////////////////////////////////////////
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`include "wally-config.vh"
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module function_radix();
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parameter PRELOAD_FILE = "funct_addr.txt";
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integer memory_bank [];
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integer index;
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logic [`XLEN-1:0] pc;
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initial begin
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$init_signal_spy("/riscv_mram_tb/dut/pc", "/riscv_mram_tb/function_radix/pc");
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end
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task automatic bin_search_min;
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input integer pc;
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input integer length;
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ref integer array [];
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output integer minval;
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integer left, right;
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integer mid;
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begin
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left = 0;
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right = length;
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while (left <= right) begin
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mid = left + ((right - left) / 2);
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if (array[mid] == pc) begin
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minval = array[mid];
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return;
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end
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if (array[mid] < pc) begin
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left = mid + 1;
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end else begin
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right = mid -1;
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end
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end // while (left <= right)
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// if the element pc is now found, right and left will be equal at this point.
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// we need to check if pc is less than the array at left or greather.
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// if it is less than pc, then we select left as the index.
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// if it is greather we want 1 less than left.
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if (array[left] < pc) begin
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minval = array[left];
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return;
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end else begin
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minval = array[left-1];
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return;
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end
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end
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endtask
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// preload
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initial $readmemh(PRELOAD_FILE, memory_bank);
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// we need to count the number of lines in the file so we can set line_count.
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integer fp;
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integer line_count = 0;
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logic [31:0] line;
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initial begin
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fp = $fopen(PRELOAD_FILE, "r");
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// read line by line to count lines
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if (fp) begin
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while (! $feof(fp)) begin
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$fscanf(fp, "%h\n", line);
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line_count = line_count + 1;
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end
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end else begin
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$display("Cannot open file %s for reading.", PRELOAD_FILE);
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$stop;
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end
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end
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always @(pc) begin
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bin_search_min(pc, line_count, memory_bank, index);
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end
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endmodule // function_radix
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