// SPDX-License-Identifier: Apache-2.0 // Copyright 2020 Western Digital Corporation or it's affiliates. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the 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. // dec: decode unit - decode, bypassing, ARF, interrupts // //******************************************************************************** // $Id$ // // // Function: Decode // Comments: Decode, dependency scoreboard, ARF // // // A -> D -> EX1 ... WB // //******************************************************************************** module el2_dec import el2_pkg::*; #( `include "el2_param.vh" ) ( input logic clk, input logic free_clk, input logic active_clk, input logic lsu_fastint_stall_any, // needed by lsu for 2nd pass of dma with ecc correction, stall next cycle // fast interrupt output logic dec_extint_stall, output logic dec_i0_decode_d, output logic dec_pause_state_cg, // to top for active state clock gating input logic rst_l, // reset, active low input logic [31:1] rst_vec, // reset vector, from core pins input logic nmi_int, // NMI pin input logic [31:1] nmi_vec, // NMI vector, from pins input logic i_cpu_halt_req, // Asynchronous Halt request to CPU input logic i_cpu_run_req, // Asynchronous Restart request to CPU output logic o_cpu_halt_status, // Halt status of core (pmu/fw) output logic o_cpu_halt_ack, // Halt request ack output logic o_cpu_run_ack, // Run request ack output logic o_debug_mode_status, // Core to the PMU that core is in debug mode. When core is in debug mode, the PMU should refrain from sendng a halt or run request input logic [31:4] core_id, // CORE ID // // external MPC halt/run interface input logic mpc_debug_halt_req, // Async halt request input logic mpc_debug_run_req, // Async run request input logic mpc_reset_run_req, // Run/halt after reset output logic mpc_debug_halt_ack, // Halt ack output logic mpc_debug_run_ack, // Run ack output logic debug_brkpt_status, // debug breakpoint input logic exu_pmu_i0_br_misp, // slot 0 branch misp input logic exu_pmu_i0_br_ataken, // slot 0 branch actual taken input logic exu_pmu_i0_pc4, // slot 0 4 byte branch input logic lsu_nonblock_load_valid_m, // valid nonblock load at m input logic [pt.LSU_NUM_NBLOAD_WIDTH-1:0] lsu_nonblock_load_tag_m, // -> corresponding tag input logic lsu_nonblock_load_inv_r, // invalidate request for nonblock load r input logic [pt.LSU_NUM_NBLOAD_WIDTH-1:0] lsu_nonblock_load_inv_tag_r, // -> corresponding tag input logic lsu_nonblock_load_data_valid, // valid nonblock load data back input logic lsu_nonblock_load_data_error, // nonblock load bus error input logic [pt.LSU_NUM_NBLOAD_WIDTH-1:0] lsu_nonblock_load_data_tag, // -> corresponding tag input logic [31:0] lsu_nonblock_load_data, // nonblock load data input logic lsu_pmu_bus_trxn, // D side bus transaction input logic lsu_pmu_bus_misaligned, // D side bus misaligned input logic lsu_pmu_bus_error, // D side bus error input logic lsu_pmu_bus_busy, // D side bus busy input logic lsu_pmu_misaligned_m, // D side load or store misaligned input logic lsu_pmu_load_external_m, // D side bus load input logic lsu_pmu_store_external_m, // D side bus store input logic dma_pmu_dccm_read, // DMA DCCM read input logic dma_pmu_dccm_write, // DMA DCCM write input logic dma_pmu_any_read, // DMA read input logic dma_pmu_any_write, // DMA write input logic [31:1] lsu_fir_addr, // Fast int address input logic [1:0] lsu_fir_error, // Fast int lookup error input logic ifu_pmu_instr_aligned, // aligned instructions input logic ifu_pmu_fetch_stall, // fetch unit stalled input logic ifu_pmu_ic_miss, // icache miss input logic ifu_pmu_ic_hit, // icache hit input logic ifu_pmu_bus_error, // Instruction side bus error input logic ifu_pmu_bus_busy, // Instruction side bus busy input logic ifu_pmu_bus_trxn, // Instruction side bus transaction input logic ifu_ic_error_start, // IC single bit error input logic ifu_iccm_rd_ecc_single_err, // ICCM single bit error input logic [3:0] lsu_trigger_match_m, input logic dbg_cmd_valid, // debugger abstract command valid input logic dbg_cmd_write, // command is a write input logic [1:0] dbg_cmd_type, // command type input logic [31:0] dbg_cmd_addr, // command address input logic [1:0] dbg_cmd_wrdata, // command write data, for fence/fence_i input logic ifu_i0_icaf, // icache access fault input logic [1:0] ifu_i0_icaf_type, input logic ifu_i0_icaf_f1, // i0 has access fault on second fetch group input logic ifu_i0_dbecc, // icache/iccm double-bit error input logic lsu_idle_any, // lsu idle for halting input el2_br_pkt_t i0_brp, // branch packet input logic [pt.BTB_ADDR_HI:pt.BTB_ADDR_LO] ifu_i0_bp_index, // BP index input logic [pt.BHT_GHR_SIZE-1:0] ifu_i0_bp_fghr, // BP FGHR input logic [pt.BTB_BTAG_SIZE-1:0] ifu_i0_bp_btag, // BP tag input el2_lsu_error_pkt_t lsu_error_pkt_r, // LSU exception/error packet input logic lsu_single_ecc_error_incr, // LSU inc SB error counter input logic lsu_imprecise_error_load_any, // LSU imprecise load bus error input logic lsu_imprecise_error_store_any, // LSU imprecise store bus error input logic [31:0] lsu_imprecise_error_addr_any, // LSU imprecise bus error address input logic [31:0] exu_div_result, // final div result input logic exu_div_wren, // Divide write enable to GPR input logic [31:0] exu_csr_rs1_x, // rs1 for csr instruction input logic [31:0] lsu_result_m, // load result input logic [31:0] lsu_result_corr_r, // load result - corrected load data input logic lsu_load_stall_any, // This is for blocking loads input logic lsu_store_stall_any, // This is for blocking stores input logic dma_dccm_stall_any, // stall any load/store at decode, pmu event input logic dma_iccm_stall_any, // iccm stalled, pmu event input logic iccm_dma_sb_error, // ICCM DMA single bit error input logic exu_flush_final, // slot0 flush input logic [31:1] exu_npc_r, // next PC input logic [31:0] exu_i0_result_x, // alu result x input logic ifu_i0_valid, // fetch valids to instruction buffer input logic [31:0] ifu_i0_instr, // fetch inst's to instruction buffer input logic [31:1] ifu_i0_pc, // pc's for instruction buffer input logic ifu_i0_pc4, // indication of 4B or 2B for corresponding inst input logic [31:1] exu_i0_pc_x, // pc's for e1 from the alu's input logic mexintpend, // External interrupt pending input logic timer_int, // Timer interrupt pending (from pin) input logic soft_int, // Software interrupt pending (from pin) input logic [7:0] pic_claimid, // PIC claimid input logic [3:0] pic_pl, // PIC priv level input logic mhwakeup, // High priority wakeup output logic [3:0] dec_tlu_meicurpl, // to PIC, Current priv level output logic [3:0] dec_tlu_meipt, // to PIC input logic [70:0] ifu_ic_debug_rd_data, // diagnostic icache read data input logic ifu_ic_debug_rd_data_valid, // diagnostic icache read data valid output el2_cache_debug_pkt_t dec_tlu_ic_diag_pkt, // packet of DICAWICS, DICAD0/1, DICAGO info for icache diagnostics // Debug start input logic dbg_halt_req, // DM requests a halt input logic dbg_resume_req, // DM requests a resume input logic ifu_miss_state_idle, // I-side miss buffer empty output logic dec_tlu_dbg_halted, // Core is halted and ready for debug command output logic dec_tlu_debug_mode, // Core is in debug mode output logic dec_tlu_resume_ack, // Resume acknowledge output logic dec_tlu_flush_noredir_r, // Tell fetch to idle on this flush output logic dec_tlu_mpc_halted_only, // Core is halted only due to MPC output logic dec_tlu_flush_leak_one_r, // single step output logic dec_tlu_flush_err_r, // iside perr/ecc rfpc output logic [31:2] dec_tlu_meihap, // Fast ext int base output logic dec_debug_wdata_rs1_d, // insert debug write data into rs1 at decode output logic [31:0] dec_dbg_rddata, // debug command read data output logic dec_dbg_cmd_done, // abstract command is done output logic dec_dbg_cmd_fail, // abstract command failed (illegal reg address) output el2_trigger_pkt_t [3:0] trigger_pkt_any, // info needed by debug trigger blocks output logic dec_tlu_force_halt, // halt has been forced // Debug end // branch info from pipe0 for errors or counter updates input logic [1:0] exu_i0_br_hist_r, // history input logic exu_i0_br_error_r, // error input logic exu_i0_br_start_error_r, // start error input logic exu_i0_br_valid_r, // valid input logic exu_i0_br_mp_r, // mispredict input logic exu_i0_br_middle_r, // middle of bank input logic exu_i0_br_way_r, // way hit or repl output logic dec_i0_rs1_en_d, // Qualify GPR RS1 data output logic dec_i0_rs2_en_d, // Qualify GPR RS2 data output logic [31:0] gpr_i0_rs1_d, // gpr rs1 data output logic [31:0] gpr_i0_rs2_d, // gpr rs2 data output logic [31:0] dec_i0_immed_d, // immediate data output logic [12:1] dec_i0_br_immed_d, // br immediate data output el2_alu_pkt_t i0_ap, // alu packet output logic dec_i0_alu_decode_d, // schedule on D-stage alu output logic dec_i0_select_pc_d, // select pc onto rs1 for jal's output logic [31:1] dec_i0_pc_d, // pc's at decode output logic [1:0] dec_i0_rs1_bypass_en_d, // rs1 bypass enable output logic [1:0] dec_i0_rs2_bypass_en_d, // rs2 bypass enable output logic [31:0] dec_i0_rs1_bypass_data_d, // rs1 bypass data output logic [31:0] dec_i0_rs2_bypass_data_d, // rs2 bypass data output el2_lsu_pkt_t lsu_p, // lsu packet output el2_mul_pkt_t mul_p, // mul packet output el2_div_pkt_t div_p, // div packet output logic dec_div_cancel, // cancel divide operation output logic [11:0] dec_lsu_offset_d, // 12b offset for load/store addresses output logic dec_csr_ren_d, // csr read enable output logic dec_tlu_flush_lower_r, // tlu flush due to late mp, exception, rfpc, or int output logic [31:1] dec_tlu_flush_path_r, // tlu flush target output logic dec_tlu_i0_kill_writeb_r, // I0 is flushed, don't writeback any results to arch state output logic dec_tlu_fence_i_r, // flush is a fence_i rfnpc, flush icache output logic [31:1] pred_correct_npc_x, // npc if prediction is correct at e2 stage output el2_br_tlu_pkt_t dec_tlu_br0_r_pkt, // slot 0 branch predictor update packet output logic dec_tlu_perfcnt0, // toggles when slot0 perf counter 0 has an event inc output logic dec_tlu_perfcnt1, // toggles when slot0 perf counter 1 has an event inc output logic dec_tlu_perfcnt2, // toggles when slot0 perf counter 2 has an event inc output logic dec_tlu_perfcnt3, // toggles when slot0 perf counter 3 has an event inc output el2_predict_pkt_t dec_i0_predict_p_d, // prediction packet to alus output logic [pt.BHT_GHR_SIZE-1:0] i0_predict_fghr_d, // DEC predict fghr output logic [pt.BTB_ADDR_HI:pt.BTB_ADDR_LO] i0_predict_index_d, // DEC predict index output logic [pt.BTB_BTAG_SIZE-1:0] i0_predict_btag_d, // DEC predict branch tag output logic dec_lsu_valid_raw_d, output logic [31:0] dec_tlu_mrac_ff, // CSR for memory region control output logic [1:0] dec_data_en, // clock-gate control logic output logic [1:0] dec_ctl_en, input logic [15:0] ifu_i0_cinst, // 16b compressed instruction output el2_trace_pkt_t rv_trace_pkt, // trace packet // feature disable from mfdc output logic dec_tlu_external_ldfwd_disable, // disable external load forwarding output logic dec_tlu_sideeffect_posted_disable, // disable posted stores to side-effect address output logic dec_tlu_core_ecc_disable, // disable core ECC output logic dec_tlu_bpred_disable, // disable branch prediction output logic dec_tlu_wb_coalescing_disable, // disable writebuffer coalescing output logic [2:0] dec_tlu_dma_qos_prty, // DMA QoS priority coming from MFDC [18:16] // clock gating overrides from mcgc output logic dec_tlu_misc_clk_override, // override misc clock domain gating output logic dec_tlu_ifu_clk_override, // override fetch clock domain gating output logic dec_tlu_lsu_clk_override, // override load/store clock domain gating output logic dec_tlu_bus_clk_override, // override bus clock domain gating output logic dec_tlu_pic_clk_override, // override PIC clock domain gating output logic dec_tlu_dccm_clk_override, // override DCCM clock domain gating output logic dec_tlu_icm_clk_override, // override ICCM clock domain gating output logic dec_tlu_i0_commit_cmt, // committed i0 instruction input logic scan_mode ); logic dec_tlu_dec_clk_override; // to and from dec blocks logic clk_override; logic dec_ib0_valid_d; logic dec_pmu_instr_decoded; logic dec_pmu_decode_stall; logic dec_pmu_presync_stall; logic dec_pmu_postsync_stall; logic dec_tlu_wr_pause_r; // CSR write to pause reg is at R. logic [4:0] dec_i0_rs1_d; logic [4:0] dec_i0_rs2_d; logic [31:0] dec_i0_instr_d; logic dec_tlu_pipelining_disable; logic [4:0] dec_i0_waddr_r; logic dec_i0_wen_r; logic [31:0] dec_i0_wdata_r; logic dec_csr_wen_r; // csr write enable at wb logic [11:0] dec_csr_wraddr_r; // write address for csryes logic [31:0] dec_csr_wrdata_r; // csr write data at wb logic [11:0] dec_csr_rdaddr_d; // read address for csr logic [31:0] dec_csr_rddata_d; // csr read data at wb logic dec_csr_legal_d; // csr indicates legal operation logic dec_csr_wen_unq_d; // valid csr with write - for csr legal logic dec_csr_any_unq_d; // valid csr - for csr legal logic dec_csr_stall_int_ff; // csr is mie/mstatus el2_trap_pkt_t dec_tlu_packet_r; logic dec_i0_pc4_d; logic dec_tlu_presync_d; logic dec_tlu_postsync_d; logic dec_tlu_debug_stall; logic [31:0] dec_illegal_inst; logic dec_i0_icaf_d; logic dec_i0_dbecc_d; logic dec_i0_icaf_f1_d; logic [3:0] dec_i0_trigger_match_d; logic dec_debug_fence_d; logic dec_nonblock_load_wen; logic [4:0] dec_nonblock_load_waddr; logic dec_tlu_flush_pause_r; el2_br_pkt_t dec_i0_brp; logic [pt.BTB_ADDR_HI:pt.BTB_ADDR_LO] dec_i0_bp_index; logic [pt.BHT_GHR_SIZE-1:0] dec_i0_bp_fghr; logic [pt.BTB_BTAG_SIZE-1:0] dec_i0_bp_btag; logic [31:1] dec_tlu_i0_pc_r; logic dec_tlu_i0_kill_writeb_wb; logic dec_tlu_flush_lower_wb; logic dec_tlu_i0_valid_r; logic dec_pause_state; logic [1:0] dec_i0_icaf_type_d; // i0 instruction access fault type logic dec_tlu_flush_extint; // Fast ext int started logic [31:0] dec_i0_inst_wb1; logic [31:1] dec_i0_pc_wb1; logic dec_tlu_i0_valid_wb1, dec_tlu_int_valid_wb1; logic [4:0] dec_tlu_exc_cause_wb1; logic [31:0] dec_tlu_mtval_wb1; logic dec_tlu_i0_exc_valid_wb1; logic [4:0] div_waddr_wb; logic dec_div_active; // non-block divide is active assign clk_override = dec_tlu_dec_clk_override; assign dec_dbg_rddata[31:0] = dec_i0_wdata_r[31:0]; el2_dec_ib_ctl #(.pt(pt)) instbuff (.*); el2_dec_decode_ctl #(.pt(pt)) decode (.*); el2_dec_tlu_ctl #(.pt(pt)) tlu (.*); el2_dec_gpr_ctl #(.pt(pt)) arf (.*, // inputs .raddr0(dec_i0_rs1_d[4:0]), .raddr1(dec_i0_rs2_d[4:0]), .wen0(dec_i0_wen_r), .waddr0(dec_i0_waddr_r[4:0]), .wd0(dec_i0_wdata_r[31:0]), .wen1(dec_nonblock_load_wen), .waddr1(dec_nonblock_load_waddr[4:0]), .wd1(lsu_nonblock_load_data[31:0]), .wen2(exu_div_wren), .waddr2(div_waddr_wb), .wd2(exu_div_result[31:0]), // outputs .rd0(gpr_i0_rs1_d[31:0]), .rd1(gpr_i0_rs2_d[31:0]) ); // Trigger el2_dec_trigger #(.pt(pt)) dec_trigger (.*); // trace assign rv_trace_pkt.rv_i_insn_ip = dec_i0_inst_wb1[31:0]; assign rv_trace_pkt.rv_i_address_ip = { dec_i0_pc_wb1[31:1], 1'b0}; assign rv_trace_pkt.rv_i_valid_ip = {dec_tlu_int_valid_wb1, // always int dec_tlu_i0_valid_wb1 | dec_tlu_i0_exc_valid_wb1}; assign rv_trace_pkt.rv_i_exception_ip = {dec_tlu_int_valid_wb1, dec_tlu_i0_exc_valid_wb1}; assign rv_trace_pkt.rv_i_ecause_ip = dec_tlu_exc_cause_wb1[4:0]; // replicate across ports assign rv_trace_pkt.rv_i_interrupt_ip = {dec_tlu_int_valid_wb1,2'b0}; assign rv_trace_pkt.rv_i_tval_ip = dec_tlu_mtval_wb1[31:0]; // replicate across ports // end trace endmodule // el2_dec