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adding data fence support

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This commit is contained in:
Blaise Tine
2021-06-28 06:12:18 -07:00
parent 6ae2f5199d
commit c6afc35989
14 changed files with 1044 additions and 9 deletions
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6
hw/rtl/VX_decode.v
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@@ -199,6 +199,10 @@ module VX_decode #(
`USED_REG (rs1_r, 1'b0, rs1);
`USED_REG (rs2_r, 1'b0, rs2);
end
`INST_F: begin
ex_type = `EX_LSU;
op_mod = `MOD_BITS'(0 == func3); // data fence
end
`INST_SYS : begin
if (func3 == 0) begin
ex_type = `EX_ALU;
@@ -241,6 +245,7 @@ module VX_decode #(
`INST_L: begin
ex_type = `EX_LSU;
op_type = `OP_BITS'({1'b0, func3});
op_mod = 0;
use_rd = 1;
imm = {{20{u_12[11]}}, u_12};
`USED_REG (rd_r, (opcode == `INST_FL), rd);
@@ -252,6 +257,7 @@ module VX_decode #(
`INST_S: begin
ex_type = `EX_LSU;
op_type = `OP_BITS'({1'b1, func3});
op_mod = 0;
imm = {{20{func7[6]}}, func7, rd};
`USED_REG (rs1_r, 1'b0, rs1);
`USED_REG (rs2_r, (opcode == `INST_FS), rs2);