mirror of
https://github.com/openhwgroup/cva6.git
synced 2025-04-24 06:07:19 -04:00
7cd183b710
using verible-v0.0-3422-g520ca4b9/bin/verible-verilog-format with default configuration Note: two files are not correctly handled by verible - core/include/std_cache_pkg.sv - core/cache_subsystem/cva6_hpdcache_if_adapter.sv
65 lines
2.6 KiB
Systemverilog
65 lines
2.6 KiB
Systemverilog
// Copyright 2018 ETH Zurich and University of Bologna.
|
|
// Copyright and related rights are licensed under the Solderpad Hardware
|
|
// License, Version 0.51 (the "License"); you may not use this file except in
|
|
// compliance with the License. You may obtain a copy of the License at
|
|
// http://solderpad.org/licenses/SHL-0.51. Unless required by applicable law
|
|
// or agreed to in writing, software, hardware and materials distributed under
|
|
// this License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
|
|
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
|
|
// specific language governing permissions and limitations under the License.
|
|
//
|
|
// Author: Florian Zaruba, ETH Zurich
|
|
// Date: 15.09.2018
|
|
// Description: Combinatorial AMO unit
|
|
module amo_alu #(
|
|
parameter config_pkg::cva6_cfg_t CVA6Cfg = config_pkg::cva6_cfg_empty
|
|
) (
|
|
// AMO interface
|
|
input ariane_pkg::amo_t amo_op_i,
|
|
input logic [63:0] amo_operand_a_i,
|
|
input logic [63:0] amo_operand_b_i,
|
|
output logic [63:0] amo_result_o // result of atomic memory operation
|
|
);
|
|
|
|
logic [64:0] adder_sum;
|
|
logic [64:0] adder_operand_a, adder_operand_b;
|
|
|
|
assign adder_sum = adder_operand_a + adder_operand_b;
|
|
|
|
always_comb begin
|
|
|
|
adder_operand_a = $signed(amo_operand_a_i);
|
|
adder_operand_b = $signed(amo_operand_b_i);
|
|
|
|
amo_result_o = amo_operand_b_i;
|
|
|
|
unique case (amo_op_i)
|
|
// the default is to output operand_b
|
|
ariane_pkg::AMO_SC: ;
|
|
ariane_pkg::AMO_SWAP: ;
|
|
ariane_pkg::AMO_ADD: amo_result_o = adder_sum[63:0];
|
|
ariane_pkg::AMO_AND: amo_result_o = amo_operand_a_i & amo_operand_b_i;
|
|
ariane_pkg::AMO_OR: amo_result_o = amo_operand_a_i | amo_operand_b_i;
|
|
ariane_pkg::AMO_XOR: amo_result_o = amo_operand_a_i ^ amo_operand_b_i;
|
|
ariane_pkg::AMO_MAX: begin
|
|
adder_operand_b = -$signed(amo_operand_b_i);
|
|
amo_result_o = adder_sum[64] ? amo_operand_b_i : amo_operand_a_i;
|
|
end
|
|
ariane_pkg::AMO_MIN: begin
|
|
adder_operand_b = -$signed(amo_operand_b_i);
|
|
amo_result_o = adder_sum[64] ? amo_operand_a_i : amo_operand_b_i;
|
|
end
|
|
ariane_pkg::AMO_MAXU: begin
|
|
adder_operand_a = $unsigned(amo_operand_a_i);
|
|
adder_operand_b = -$unsigned(amo_operand_b_i);
|
|
amo_result_o = adder_sum[64] ? amo_operand_b_i : amo_operand_a_i;
|
|
end
|
|
ariane_pkg::AMO_MINU: begin
|
|
adder_operand_a = $unsigned(amo_operand_a_i);
|
|
adder_operand_b = -$unsigned(amo_operand_b_i);
|
|
amo_result_o = adder_sum[64] ? amo_operand_a_i : amo_operand_b_i;
|
|
end
|
|
default: amo_result_o = '0;
|
|
endcase
|
|
end
|
|
endmodule
|