Add SDCard support

src/main/scala/common/SDCard.scala

@@ -0,0 +1,74 @@
+/***************************************************************************************
+* Copyright (c) 2020-2024 Institute of Computing Technology, Chinese Academy of Sciences
+*
+* XiangShan is licensed under Mulan PSL v2.
+* You can use this software according to the terms and conditions of the Mulan PSL v2.
+* You may obtain a copy of Mulan PSL v2 at:
+*          http://license.coscl.org.cn/MulanPSL2
+*
+* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+*
+* See the Mulan PSL v2 for more details.
+***************************************************************************************/
+
+package difftest.common
+
+import chisel3._
+import chisel3.experimental.ExtModule
+import chisel3.util._
+
+class DifftestSDCardRead extends Bundle {
+  val setAddr = Input(Bool())
+  val addr = Input(UInt(32.W))
+  val ren = Input(Bool())
+  val data = Output(UInt(32.W))
+}
+
+class SDCardHelper extends ExtModule with HasExtModuleInline {
+  val clock = IO(Input(Clock()))
+  val io = IO(new DifftestSDCardRead)
+
+  setInline("SDCardHelper.v",
+    s"""
+       |`ifndef SYNTHESIS
+       |import "DPI-C" function void sd_setaddr(input int addr);
+       |import "DPI-C" function void sd_read(output int data);
+       |`endif // SYNTHESIS
+       |
+       |module SDCardHelper (
+       |  input clock,
+       |  input io_setAddr,
+       |  input [31:0] io_addr,
+       |  input io_ren,
+       |  output reg [31:0] io_data
+       |);
+       |
+       |`ifndef SYNTHESIS
+       |  always@(negedge clock) begin
+       |    if (io_ren) sd_read(io_data);
+       |  end
+       |  always@(posedge clock) begin
+       |    if (io_setAddr) sd_setaddr(io_addr);
+       |  end
+       |`endif // SYNTHESIS
+       |
+       |endmodule
+     """.stripMargin)
+}
+
+class DifftestSDCard extends Module {
+  val io = IO(new DifftestSDCardRead)
+
+  val helper = Module(new SDCardHelper)
+  helper.clock := clock
+
+  io <> helper.io
+}
+
+object DifftestSDCard {
+  def apply(): DifftestSDCardRead = {
+    Module(new DifftestSDCard).io
+  }
+}