Merge branch 'master' of nyus.joshuawise.com:/git/firearm
authorChristopher Lu <lu@stop.hsd1.pa.comcast.net>
Fri, 9 Jan 2009 06:24:18 +0000 (01:24 -0500)
committerChristopher Lu <lu@stop.hsd1.pa.comcast.net>
Fri, 9 Jan 2009 06:24:18 +0000 (01:24 -0500)
1  2 
Memory.v

diff --combined Memory.v
+++ b/Memory.v
@@@ -50,9 -50,9 +50,9 @@@ module Memory
        );
  
        reg [31:0] addr, raddr, prev_raddr, next_regdata, next_outcpsr;
 +      reg [31:0] prevaddr;
        reg [3:0] next_regsel, cur_reg, prev_reg;
        reg next_writeback;
 -      reg [31:0] align_s1, align_s2, align_rddata;
  
        wire next_outbubble;    
        wire next_write_reg;
        wire [31:0] next_write_data;
  
        reg [1:0] lsr_state = 2'b01, next_lsr_state;
 +      reg [31:0] align_s1, align_s2, align_rddata;
 +
 +      reg [1:0] lsrh_state = 2'b01, next_lsrh_state;
 +      reg [31:0] lsrh_rddata;
 +      reg [15:0] lsrh_rddata_s1;
 +      reg [7:0] lsrh_rddata_s2;
  
        reg [15:0] regs, next_regs;
        reg [2:0] lsm_state = 3'b001, next_lsm_state;
                out_cpsr <= next_outcpsr;
                out_spsr <= spsr;
                swp_state <= next_swp_state;
 +              lsm_state <= next_lsm_state;
 +              lsr_state <= next_lsr_state;
 +              lsrh_state <= next_lsrh_state;
 +              prevaddr <= addr;
        end
  
        always @(*)
        begin
 -              addr = 32'hxxxxxxxx;
 +              addr = prevaddr;
                raddr = 32'hxxxxxxxx;
                rd_req = 1'b0;
                wr_req = 1'b0;
                cp_write = 32'hxxxxxxxx;
                offset = prev_offset;
                next_outcpsr = lsm_state == 3'b010 ? out_cpsr : cpsr;
 +              lsrh_rddata = 32'hxxxxxxxx;
                next_lsm_state = lsm_state;
                next_lsr_state = lsr_state;
 +              next_lsrh_state = lsrh_state;
                next_swp_oldval = swp_oldval;
                next_swp_state = swp_state;
                cur_reg = prev_reg;
                        default: begin end
                        endcase
                end
 +              `DECODE_ALU_HDATA_REG,
 +              `DECODE_ALU_HDATA_IMM: if(!inbubble) begin
 +                      next_outbubble = rw_wait;
 +                      outstall = rw_wait;
 +                      addr = insn[23] ? op0 + op1 : op0 - op1; /* up/down select */
 +                      raddr = insn[24] ? op0 : addr; /* pre/post increment */
 +                      busaddr = raddr;
 +                      /* rotate to correct position */
 +                      case(insn[6:5])
 +                      2'b00: begin end /* swp */
 +                      2'b01: begin /* unsigned half */
 +                              wr_data = {2{op2[15:0]}}; /* XXX need to store halfword */
 +                              lsrh_rddata = {16'b0, raddr[1] ? rd_data[31:16] : rd_data[15:0]};
 +                      end
 +                      2'b10: begin /* signed byte */
 +                              wr_data = {4{op2[7:0]}};
 +                              lsrh_rddata_s1 = raddr[1] ? rd_data[31:16] : rd_data[15:0];
 +                              lsrh_rddata_s2 = raddr[0] ? lsrh_rddata_s1[15:8] : lsrh_rddata_s1[7:0];
 +                              lsrh_rddata = {{24{lsrh_rddata_s2[7]}}, lsrh_rddata_s2};
 +                      end
 +                      2'b11: begin /* signed half */
 +                              wr_data = {2{op2[15:0]}};
 +                              lsrh_rddata = raddr[1] ? {{16{rd_data[31]}}, rd_data[31:16]} : {{16{rd_data[15]}}, rd_data[15:0]};
 +                      end
 +                      endcase
 +
 +                      case(lsrh_state)
 +                      2'b01: begin
 +                              rd_req = insn[20];
 +                              wr_req = ~insn[20];
 +                              next_write_num = insn[15:12];
 +                              next_write_data = lsrh_rddata;
 +                              if(insn[20]) begin
 +                                      next_write_reg = 1'b1;
 +                              end
 +                              if(insn[21] | !insn[24]) begin
 +                                      outstall = 1'b1;
 +                                      if(!rw_wait)
 +                                              next_lsrh_state = 2'b10;
 +                              end
 +                      end
 +                      2'b10: begin
 +                              next_write_reg = 1'b1;
 +                              next_write_num = insn[19:16];
 +                              next_write_data = addr;
 +                              next_lsrh_state = 2'b10;
 +                      end
 +                      default: begin end
 +                      endcase
 +              end
                `DECODE_LDRSTR_UNDEFINED: begin end
                `DECODE_LDRSTR: if(!inbubble) begin
                        next_outbubble = rw_wait;
                        outstall = rw_wait;
                        addr = insn[23] ? op0 + op1 : op0 - op1; /* up/down select */
                        raddr = insn[24] ? op0 : addr; /* pre/post increment */
 -                      busaddr = {raddr[31:2], 2'b0};
 -                              /* rotate to correct position */
 +                      busaddr = raddr;
 +                      /* rotate to correct position */
                        align_s1 = raddr[1] ? {rd_data[15:0], rd_data[31:16]} : rd_data;
                        align_s2 = raddr[0] ? {align_s1[7:0], align_s1[31:8]} : align_s1;
                        /* select byte or word */
                        align_rddata = insn[22] ? {24'b0, align_s2[7:0]} : align_s2;
 -                      if(!insn[20]) begin
 -                              wr_data = insn[22] ? {4{op2[7:0]}} : op2; /* XXX need to actually store just a byte */
 -                      end
 +                      wr_data = insn[22] ? {4{op2[7:0]}} : op2; /* XXX need to actually store just a byte */
                        case(lsr_state)
                        2'b01: begin
                                rd_req = insn[20];
                                wr_req = ~insn[20];
 +                              next_write_reg = 1'b1;
 +                              next_write_num = insn[15:12];
                                if(insn[20]) begin
 -                                      next_write_reg = 1'b1;
 -                                      next_write_num = insn[15:12];
                                        next_write_data = align_rddata;
                                end
 -                                      if(insn[21]) begin
 +                              if(insn[21] | !insn[24]) begin
                                        outstall = 1'b1;
                                        if(!rw_wait)
                                                next_lsr_state = 2'b10;
  
                                st_read = cur_reg;
                                wr_data = st_data;
 -                              busaddr = {raddr[31:2], 2'b0};
 +                              busaddr = raddr;
  
                                outstall = 1'b1;
  
                                next_outbubble = 1;
                        end
                        if (!cp_ack) begin
-                               $display("WARNING: Possible MRCMCR undefined instruction");
+                               $display("WARNING: Possible MRCMCR undefined instruction: cp_ack %d, cp_busy %d",cp_ack, cp_busy);
                        end
+                       $display("MRCMCR: ack %d, busy %d", cp_ack, cp_busy);
                end
                default: begin end
                endcase
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