[6] | 1 | // ========== Copyright Header Begin ========================================== |
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| 2 | // |
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| 3 | // OpenSPARC T1 Processor File: sparc_ifu_dec.v |
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| 4 | // Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved. |
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| 5 | // DO NOT ALTER OR REMOVE COPYRIGHT NOTICES. |
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| 6 | // |
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| 7 | // The above named program is free software; you can redistribute it and/or |
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| 8 | // modify it under the terms of the GNU General Public |
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| 9 | // License version 2 as published by the Free Software Foundation. |
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| 10 | // |
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| 11 | // The above named program is distributed in the hope that it will be |
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| 12 | // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | // General Public License for more details. |
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| 15 | // |
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| 16 | // You should have received a copy of the GNU General Public |
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| 17 | // License along with this work; if not, write to the Free Software |
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| 18 | // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. |
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| 19 | // |
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| 20 | // ========== Copyright Header End ============================================ |
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| 21 | //////////////////////////////////////////////////////////////////////// |
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| 22 | /* |
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| 23 | // Module Name: sparc_ifu_dec |
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| 24 | // Description: |
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| 25 | // The decode block implements the sparc instruction decode ROM |
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| 26 | // It has a purely combinational part and some staging flops |
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| 27 | */ |
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| 28 | //////////////////////////////////////////////////////////////////////// |
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| 29 | |
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| 30 | module sparc_ifu_dec(/*AUTOARG*/ |
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| 31 | // Outputs |
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| 32 | so, ifu_exu_aluop_d, ifu_exu_invert_d, ifu_exu_useimm_d, |
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| 33 | ifu_exu_usecin_d, ifu_exu_enshift_d, ifu_exu_tagop_d, |
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| 34 | ifu_exu_tv_d, ifu_exu_muls_d, ifu_exu_ialign_d, |
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| 35 | ifu_exu_range_check_jlret_d, ifu_exu_range_check_other_d, |
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| 36 | ifu_exu_shiftop_d, ifu_exu_muldivop_d, ifu_exu_wen_d, |
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| 37 | ifu_exu_setcc_d, ifu_exu_rd_ifusr_e, ifu_exu_rd_exusr_e, |
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| 38 | ifu_exu_rd_ffusr_e, ifu_exu_rs1_vld_d, ifu_exu_rs2_vld_d, |
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| 39 | ifu_exu_rs3e_vld_d, ifu_exu_rs3o_vld_d, ifu_exu_use_rsr_e_l, |
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| 40 | ifu_exu_save_d, ifu_exu_restore_d, ifu_exu_return_d, |
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| 41 | ifu_exu_flushw_e, ifu_exu_saved_e, ifu_exu_restored_e, |
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| 42 | ifu_tlu_rsr_inst_d, ifu_lsu_wsr_inst_d, ifu_exu_wsr_inst_d, |
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| 43 | ifu_tlu_done_inst_d, ifu_tlu_retry_inst_d, ifu_lsu_ld_inst_e, |
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| 44 | ifu_lsu_st_inst_e, ifu_lsu_pref_inst_e, ifu_lsu_alt_space_e, |
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| 45 | ifu_lsu_alt_space_d, ifu_tlu_alt_space_d, ifu_lsu_memref_d, |
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| 46 | ifu_lsu_sign_ext_e, ifu_lsu_ldstub_e, ifu_lsu_casa_e, |
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| 47 | ifu_exu_casa_d, ifu_lsu_swap_e, ifu_tlu_mb_inst_e, |
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| 48 | ifu_tlu_sir_inst_m, ifu_tlu_flsh_inst_e, ifu_lsu_ldst_dbl_e, |
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| 49 | ifu_lsu_ldst_fp_e, ifu_lsu_ldst_size_e, ifu_ffu_fpop1_d, |
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| 50 | ifu_ffu_visop_d, ifu_ffu_fpop2_d, ifu_ffu_fld_d, ifu_ffu_fst_d, |
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| 51 | ifu_ffu_ldst_size_d, ifu_ffu_ldfsr_d, ifu_ffu_ldxfsr_d, |
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| 52 | ifu_ffu_stfsr_d, ifu_ffu_quad_op_e, dec_fcl_rdsr_sel_pc_d, |
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| 53 | dec_fcl_rdsr_sel_thr_d, dec_imd_call_inst_d, |
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| 54 | dtu_fcl_flush_sonly_e, dtu_fcl_illinst_e, dtu_fcl_fpdis_e, |
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| 55 | dtu_fcl_privop_e, dtu_fcl_imask_hit_e, dtu_fcl_br_inst_d, |
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| 56 | dtu_fcl_sir_inst_e, dtu_ifq_kill_latest_d, dec_swl_wrt_tcr_w, |
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| 57 | dec_swl_wrtfprs_w, dec_swl_ll_done_d, dec_swl_br_done_d, |
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| 58 | dec_swl_rdsr_sel_thr_d, dec_swl_ld_inst_d, dec_swl_sta_inst_e, |
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| 59 | dec_swl_std_inst_d, dec_swl_st_inst_d, dec_swl_fpop_d, |
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| 60 | dec_swl_allfp_d, dec_swl_frf_upper_d, dec_swl_frf_lower_d, |
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| 61 | dec_swl_div_inst_d, dec_swl_mul_inst_d, wsr_fixed_inst_w, |
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| 62 | ifu_exu_sethi_inst_d, dec_dcl_cctype_d, |
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| 63 | // Inputs |
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| 64 | rclk, se, si, dtu_inst_d, erb_dtu_imask, swl_dec_ibe_e, |
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| 65 | dtu_inst_anull_e, lsu_ifu_ldsta_internal_e, fcl_dtu_tlzero_d, |
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| 66 | fcl_dtu_privmode_d, fcl_dtu_hprivmode_d, fcl_dtu_inst_vld_d, |
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| 67 | fcl_dtu_ely_inst_vld_d, fcl_dec_intr_vld_d, fcl_dtu_inst_vld_e, |
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| 68 | fcl_dec_dslot_s, swl_dec_mulbusy_e, swl_dec_fpbusy_e, |
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| 69 | swl_dec_divbusy_e, swl_dec_fp_enable_d |
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| 70 | ); |
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| 71 | |
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| 72 | input rclk, |
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| 73 | se, |
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| 74 | si; |
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| 75 | input [31:0] dtu_inst_d; // fed in at Switch (S) stage. |
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| 76 | input [38:0] erb_dtu_imask; |
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| 77 | input swl_dec_ibe_e; |
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| 78 | input dtu_inst_anull_e; |
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| 79 | input lsu_ifu_ldsta_internal_e; |
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| 80 | input fcl_dtu_tlzero_d; |
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| 81 | input fcl_dtu_privmode_d; |
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| 82 | input fcl_dtu_hprivmode_d; |
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| 83 | input fcl_dtu_inst_vld_d, |
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| 84 | fcl_dtu_ely_inst_vld_d, |
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| 85 | fcl_dec_intr_vld_d, |
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| 86 | fcl_dtu_inst_vld_e; // qual with this is not necessary |
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| 87 | |
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| 88 | input fcl_dec_dslot_s; |
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| 89 | |
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| 90 | input swl_dec_mulbusy_e; |
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| 91 | input swl_dec_fpbusy_e; |
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| 92 | input swl_dec_divbusy_e; |
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| 93 | input swl_dec_fp_enable_d; |
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| 94 | |
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| 95 | |
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| 96 | output so; |
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| 97 | |
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| 98 | // to EXU |
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| 99 | output [2:0] ifu_exu_aluop_d;// 000 - add/sub |
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| 100 | // 001 - and |
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| 101 | // 010 - or |
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| 102 | // 011 - xor |
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| 103 | // 1X0 - movcc |
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| 104 | // 1x1 - movr |
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| 105 | output ifu_exu_invert_d; // invert rs2 operand |
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| 106 | output ifu_exu_useimm_d; |
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| 107 | output ifu_exu_usecin_d; // use c from icc |
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| 108 | output ifu_exu_enshift_d; // turn on shifter |
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| 109 | |
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| 110 | output ifu_exu_tagop_d, |
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| 111 | ifu_exu_tv_d, |
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| 112 | ifu_exu_muls_d, |
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| 113 | ifu_exu_ialign_d, |
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| 114 | ifu_exu_range_check_jlret_d, |
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| 115 | ifu_exu_range_check_other_d; |
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| 116 | |
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| 117 | output [2:0] ifu_exu_shiftop_d; // b2 - 32b(0) or 64b(1) |
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| 118 | // b1 - unsigned(0) or signed(1) |
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| 119 | // b0 - left(0) or right(1) shift |
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| 120 | |
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| 121 | output [4:0] ifu_exu_muldivop_d; // b4 - is_mul |
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| 122 | // b3 - is_div |
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| 123 | // b2 - 64b if 1, 32b if 0 |
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| 124 | // b1 - signed if 1, unsigned if 0 |
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| 125 | // b0 - set cc's |
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| 126 | |
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| 127 | output ifu_exu_wen_d; // write to rd |
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| 128 | output ifu_exu_setcc_d; // b0 - write to icc/xcc |
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| 129 | |
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| 130 | output ifu_exu_rd_ifusr_e, |
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| 131 | ifu_exu_rd_exusr_e, |
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| 132 | ifu_exu_rd_ffusr_e; |
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| 133 | |
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| 134 | output ifu_exu_rs1_vld_d, |
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| 135 | ifu_exu_rs2_vld_d, |
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| 136 | ifu_exu_rs3e_vld_d, |
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| 137 | ifu_exu_rs3o_vld_d; |
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| 138 | |
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| 139 | output ifu_exu_use_rsr_e_l; |
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| 140 | |
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| 141 | output ifu_exu_save_d, |
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| 142 | ifu_exu_restore_d, |
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| 143 | ifu_exu_return_d, |
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| 144 | ifu_exu_flushw_e, |
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| 145 | ifu_exu_saved_e, |
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| 146 | ifu_exu_restored_e; |
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| 147 | |
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| 148 | // to TLU |
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| 149 | output ifu_tlu_rsr_inst_d, |
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| 150 | ifu_lsu_wsr_inst_d, |
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| 151 | ifu_exu_wsr_inst_d, |
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| 152 | ifu_tlu_done_inst_d, |
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| 153 | ifu_tlu_retry_inst_d; |
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| 154 | |
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| 155 | // to LSU |
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| 156 | output ifu_lsu_ld_inst_e, // ld inst or atomic |
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| 157 | ifu_lsu_st_inst_e, // store or atomic |
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| 158 | ifu_lsu_pref_inst_e, |
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| 159 | ifu_lsu_alt_space_e, // alt space -- to be removed |
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| 160 | ifu_lsu_alt_space_d, // never x -- to be removed |
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| 161 | ifu_tlu_alt_space_d, // sometimes x but faster |
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| 162 | ifu_lsu_memref_d; // alerts lsu of upcoming ldst |
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| 163 | // ifu_lsu_imm_asi_vld_d; |
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| 164 | |
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| 165 | output ifu_lsu_sign_ext_e, |
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| 166 | ifu_lsu_ldstub_e, |
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| 167 | ifu_lsu_casa_e, |
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| 168 | ifu_exu_casa_d, |
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| 169 | ifu_lsu_swap_e; |
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| 170 | |
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| 171 | output ifu_tlu_mb_inst_e, |
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| 172 | ifu_tlu_sir_inst_m, |
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| 173 | ifu_tlu_flsh_inst_e; |
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| 174 | |
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| 175 | output ifu_lsu_ldst_dbl_e, |
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| 176 | ifu_lsu_ldst_fp_e; |
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| 177 | |
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| 178 | output [1:0] ifu_lsu_ldst_size_e; |
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| 179 | |
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| 180 | // to SPU |
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| 181 | // output ifu_spu_scpy_inst_e, |
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| 182 | // ifu_spu_scmp_inst_e; |
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| 183 | |
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| 184 | // to FFU |
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| 185 | output ifu_ffu_fpop1_d; |
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| 186 | output ifu_ffu_visop_d; |
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| 187 | output ifu_ffu_fpop2_d; |
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| 188 | output ifu_ffu_fld_d; |
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| 189 | output ifu_ffu_fst_d; |
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| 190 | output ifu_ffu_ldst_size_d; |
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| 191 | |
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| 192 | output ifu_ffu_ldfsr_d, |
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| 193 | ifu_ffu_ldxfsr_d, |
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| 194 | ifu_ffu_stfsr_d; |
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| 195 | output ifu_ffu_quad_op_e; |
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| 196 | |
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| 197 | // within IFU |
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| 198 | output dec_fcl_rdsr_sel_pc_d, |
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| 199 | dec_fcl_rdsr_sel_thr_d; |
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| 200 | |
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| 201 | output dec_imd_call_inst_d; |
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| 202 | |
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| 203 | output dtu_fcl_flush_sonly_e, |
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| 204 | // dec_fcl_kill4sta_e, |
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| 205 | dtu_fcl_illinst_e, |
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| 206 | dtu_fcl_fpdis_e, |
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| 207 | dtu_fcl_privop_e, |
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| 208 | dtu_fcl_imask_hit_e, |
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| 209 | dtu_fcl_br_inst_d, |
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| 210 | dtu_fcl_sir_inst_e; |
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| 211 | |
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| 212 | output dtu_ifq_kill_latest_d; |
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| 213 | |
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| 214 | // within DTU |
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| 215 | output dec_swl_wrt_tcr_w, |
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| 216 | dec_swl_wrtfprs_w, |
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| 217 | dec_swl_ll_done_d, |
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| 218 | dec_swl_br_done_d, |
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| 219 | dec_swl_rdsr_sel_thr_d, |
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| 220 | dec_swl_ld_inst_d, |
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| 221 | dec_swl_sta_inst_e, |
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| 222 | dec_swl_std_inst_d, |
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| 223 | dec_swl_st_inst_d, |
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| 224 | dec_swl_fpop_d, |
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| 225 | dec_swl_allfp_d, |
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| 226 | dec_swl_frf_upper_d, |
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| 227 | dec_swl_frf_lower_d, |
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| 228 | dec_swl_div_inst_d, |
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| 229 | dec_swl_mul_inst_d, |
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| 230 | wsr_fixed_inst_w, |
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| 231 | ifu_exu_sethi_inst_d; // can be sethi or no-op |
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| 232 | |
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| 233 | output [2:0] dec_dcl_cctype_d; // 0yy - fcc(yy) |
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| 234 | // 100 - icc |
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| 235 | // 110 - xcc |
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| 236 | // 1X1 - illegal inst! |
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| 237 | |
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| 238 | //------------------------------------------------------------ |
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| 239 | // Declarations |
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| 240 | //------------------------------------------------------------ |
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| 241 | // Internal Signals |
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| 242 | wire [1:0] op; |
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| 243 | wire [2:0] op2; |
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| 244 | wire [5:0] op3; |
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| 245 | wire [8:0] opf; |
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| 246 | |
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| 247 | wire brsethi_inst, // op types |
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| 248 | call_inst, |
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| 249 | arith_inst, |
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| 250 | mem_inst; |
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| 251 | wire sethi_or_nop; |
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| 252 | wire [15:0] op3_lo; // decode op3[3:0] |
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| 253 | wire [3:0] op3_hi; // decode op3[5:4] |
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| 254 | |
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| 255 | wire dbr_inst_d, |
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| 256 | ibr_inst_d, // jmpl or return |
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| 257 | jmpl_inst_d, |
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| 258 | retn_inst_d, |
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| 259 | sethi_inst_d; |
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| 260 | |
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| 261 | wire rdsr_done_d, |
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| 262 | rdpr_done_d; |
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| 263 | wire dslot_d; |
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| 264 | |
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| 265 | wire use_rsr_d_l; |
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| 266 | |
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| 267 | wire flushw_d, |
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| 268 | saved_d, |
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| 269 | restored_d; |
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| 270 | wire save_retn_done_d; |
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| 271 | wire privop_d, |
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| 272 | privop_e, |
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| 273 | hprivop_d, |
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| 274 | hprivop_e, |
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| 275 | valid_hp_rs_d, |
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| 276 | valid_hp_rd_d, |
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| 277 | inv_reg_access_d, |
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| 278 | rsvchk_fail_d, |
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| 279 | ill_inst_d, |
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| 280 | ill_inst_e; |
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| 281 | |
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| 282 | wire inst12_5_nonzero_d, |
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| 283 | inst11_8_nonzero_d, |
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| 284 | inst9_5_nonzero_d, |
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| 285 | rs2_nonzero_d; |
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| 286 | |
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| 287 | wire state_chg_inst_d, |
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| 288 | state_chg_inst_e, |
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| 289 | flush_inst_d; |
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| 290 | |
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| 291 | wire cctype_sel_imov, // select which CC's to use |
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| 292 | cctype_sel_fmov, |
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| 293 | cctype_sel_bcc, |
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| 294 | cctype_sel_bpcc; |
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| 295 | |
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| 296 | wire rs1_vld_d, |
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| 297 | rs2_vld_d, |
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| 298 | rs3_vld_d, |
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| 299 | rs4_vld_d; |
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| 300 | |
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| 301 | wire [4:0] rs1, |
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| 302 | rd; |
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| 303 | |
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| 304 | wire rs1_00, // decoded rs1 |
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| 305 | rs1_01, |
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| 306 | rs1_02, |
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| 307 | rs1_05, |
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| 308 | rs1_06, |
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| 309 | rs1_07, |
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| 310 | rs1_09_0e, |
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| 311 | rs1_0f, |
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| 312 | rs1_10, |
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| 313 | rs1_12, |
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| 314 | rs1_13, |
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| 315 | rs1_14_15, |
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| 316 | rs1_16_17, |
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| 317 | rs1_19, |
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| 318 | rs1_1a, |
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| 319 | rs1_1b, |
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| 320 | rs1_1c_1f, |
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| 321 | rd_00, |
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| 322 | rd_01, |
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| 323 | rd_04, |
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| 324 | rd_05, |
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| 325 | rd_06, |
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| 326 | rd_07, |
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| 327 | rd_09, |
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| 328 | rd_0f, |
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| 329 | rd_10, |
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| 330 | rd_11, |
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| 331 | rd_12, |
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| 332 | rd_13, |
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| 333 | rd_18, |
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| 334 | rd_1a, |
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| 335 | rd_1b, |
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| 336 | rd_1c_1f, |
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| 337 | rd_1f, |
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| 338 | rs1_1f; |
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| 339 | |
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| 340 | wire fcn0; |
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| 341 | |
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| 342 | wire rd_ifusr_d, |
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| 343 | rd_ifusr_e, |
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| 344 | rd_ffusr_d, |
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| 345 | rd_ffusr_e, |
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| 346 | rd_exusr_d, |
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| 347 | rd_exusr_e; |
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| 348 | wire wsr_fixed_inst_e, |
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| 349 | wsr_fixed_inst_m, |
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| 350 | wsr_inst_next_e, |
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| 351 | wsr_fixed_inst_d; |
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| 352 | |
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| 353 | wire wrt_tcr_d, |
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| 354 | wrt_tcr_e, |
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| 355 | wrt_tcr_qual_e, |
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| 356 | wrt_tcr_m; |
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| 357 | |
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| 358 | wire wrt_fprs_d, |
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| 359 | wrt_fprs_e, |
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| 360 | wrt_fprs_qual_e, |
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| 361 | wrt_fprs_m; |
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| 362 | |
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| 363 | wire prefetch, |
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| 364 | impl_prefetch, |
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| 365 | illegal_prefetch, |
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| 366 | noop_prefetch, |
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| 367 | pref_done_d, |
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| 368 | prefetch_d, |
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| 369 | prefetch_e; |
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| 370 | |
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| 371 | wire [2:0] lstype_d, |
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| 372 | lstype_e; |
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| 373 | wire [1:0] lssize_d; |
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| 374 | wire ldst_dbl_d, |
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| 375 | ldst_fp_d, |
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| 376 | sta_inst_d, |
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| 377 | // kill_for_sta_d, |
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| 378 | sta_nostf_d, |
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| 379 | sta_inst_e, |
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| 380 | sta_nostf_e, |
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| 381 | sext_d, |
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| 382 | ldstub_d, |
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| 383 | casa_d, |
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| 384 | casa_e, |
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| 385 | swap_d; |
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| 386 | |
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| 387 | wire mb_mask_d, |
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| 388 | mb_inst_d, |
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| 389 | mb_inst_e; |
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| 390 | |
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| 391 | wire sir_inst_d, |
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| 392 | sir_inst_e, |
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| 393 | // kill_sir_d, |
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| 394 | flag_sir_d, |
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| 395 | flag_sir_e; |
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| 396 | |
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| 397 | wire fpld_d, |
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| 398 | fpop1_d, |
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| 399 | visop_d, |
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| 400 | int_align_d, |
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| 401 | fpop2_d; |
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| 402 | wire quad_ffuop_d; |
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| 403 | |
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| 404 | wire allfp_d, |
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| 405 | any_fpinst_d, |
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| 406 | fpdis_trap_d, |
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| 407 | fpdis_trap_e, |
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| 408 | fcc_mov_d, |
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| 409 | fcc_branch_d; |
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| 410 | |
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| 411 | wire rs2_hit, |
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| 412 | opf_hit, |
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| 413 | ibit_hit, |
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| 414 | rs1_hit, |
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| 415 | op3_hit, |
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| 416 | rd_hit, |
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| 417 | op_hit, |
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| 418 | imask_hit, |
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| 419 | imask_hit_e; |
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| 420 | |
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| 421 | wire clk; |
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| 422 | |
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| 423 | |
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| 424 | //---------------------------------------------------------------------- |
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| 425 | // Code Begins Here |
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| 426 | //---------------------------------------------------------------------- |
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| 427 | assign clk = rclk; |
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| 428 | |
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| 429 | |
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| 430 | assign op = dtu_inst_d[31:30]; |
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| 431 | assign op2 = dtu_inst_d[24:22]; |
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| 432 | assign op3 = dtu_inst_d[24:19]; |
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| 433 | assign opf = dtu_inst_d[13:5]; |
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| 434 | |
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| 435 | // decode op |
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| 436 | assign brsethi_inst = ~op[1] & ~op[0]; |
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| 437 | assign call_inst = ~op[1] & op[0]; |
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| 438 | assign arith_inst = op[1] & ~op[0]; |
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| 439 | assign mem_inst = op[1] & op[0]; |
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| 440 | |
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| 441 | // partial decode op2 |
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| 442 | assign sethi_or_nop = op2[2] & ~op2[1] & ~op2[0]; |
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| 443 | |
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| 444 | // decode op3 |
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| 445 | assign op3_hi[0] = ~op3[5] & ~op3[4]; |
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| 446 | assign op3_hi[1] = ~op3[5] & op3[4]; |
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| 447 | assign op3_hi[2] = op3[5] & ~op3[4]; |
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| 448 | assign op3_hi[3] = op3[5] & op3[4]; |
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| 449 | |
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| 450 | assign op3_lo[0] = ~op3[3] & ~op3[2] & ~op3[1] & ~op3[0]; |
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| 451 | assign op3_lo[1] = ~op3[3] & ~op3[2] & ~op3[1] & op3[0]; |
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| 452 | assign op3_lo[2] = ~op3[3] & ~op3[2] & op3[1] & ~op3[0]; |
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| 453 | assign op3_lo[3] = ~op3[3] & ~op3[2] & op3[1] & op3[0]; |
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| 454 | assign op3_lo[4] = ~op3[3] & op3[2] & ~op3[1] & ~op3[0]; |
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| 455 | assign op3_lo[5] = ~op3[3] & op3[2] & ~op3[1] & op3[0]; |
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| 456 | assign op3_lo[6] = ~op3[3] & op3[2] & op3[1] & ~op3[0]; |
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| 457 | assign op3_lo[7] = ~op3[3] & op3[2] & op3[1] & op3[0]; |
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| 458 | assign op3_lo[8] = op3[3] & ~op3[2] & ~op3[1] & ~op3[0]; |
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| 459 | assign op3_lo[9] = op3[3] & ~op3[2] & ~op3[1] & op3[0]; |
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| 460 | assign op3_lo[10] = op3[3] & ~op3[2] & op3[1] & ~op3[0]; |
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| 461 | assign op3_lo[11] = op3[3] & ~op3[2] & op3[1] & op3[0]; |
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| 462 | assign op3_lo[12] = op3[3] & op3[2] & ~op3[1] & ~op3[0]; |
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| 463 | assign op3_lo[13] = op3[3] & op3[2] & ~op3[1] & op3[0]; |
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| 464 | assign op3_lo[14] = op3[3] & op3[2] & op3[1] & ~op3[0]; |
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| 465 | assign op3_lo[15] = op3[3] & op3[2] & op3[1] & op3[0]; |
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| 466 | |
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| 467 | //------------------------- |
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| 468 | // Branch and Move Controls |
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| 469 | //------------------------- |
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| 470 | // brtype |
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| 471 | assign dbr_inst_d = brsethi_inst & (op2[1] | op2[0]) | // regular branch |
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| 472 | call_inst; |
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| 473 | assign jmpl_inst_d = arith_inst & op3_hi[3] & op3_lo[8]; // jmpl |
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| 474 | assign retn_inst_d = arith_inst & op3_hi[3] & op3_lo[9]; // retn |
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| 475 | assign ibr_inst_d = jmpl_inst_d | retn_inst_d; |
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| 476 | assign sethi_inst_d = brsethi_inst & sethi_or_nop; |
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| 477 | assign ifu_exu_sethi_inst_d = sethi_inst_d; |
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| 478 | |
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| 479 | assign dec_swl_br_done_d = (dbr_inst_d | jmpl_inst_d); // br compl. |
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| 480 | // retn has separate |
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| 481 | // completion signal |
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| 482 | assign dtu_fcl_br_inst_d = dbr_inst_d | ibr_inst_d; |
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| 483 | assign dec_imd_call_inst_d = call_inst; |
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| 484 | |
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| 485 | // MV-BR Condition |
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| 486 | assign cctype_sel_imov = op[1] & ~op3[4]; |
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| 487 | assign cctype_sel_fmov = op[1] & op3[4]; |
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| 488 | assign cctype_sel_bcc = ~op[1] & op2[1]; |
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| 489 | assign cctype_sel_bpcc = ~op[1] & ~op2[1]; |
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| 490 | |
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| 491 | mux4ds #(3) cctype_mux(.dout (dec_dcl_cctype_d), |
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| 492 | .in0 ({dtu_inst_d[18], dtu_inst_d[12:11]}), |
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| 493 | .in1 (dtu_inst_d[13:11]), |
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| 494 | // op2[2]=1 for fp branch |
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| 495 | .in2 ({~op2[2], 2'b00}), |
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| 496 | .in3 ({~op2[2], dtu_inst_d[21:20]}), |
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| 497 | .sel0 (cctype_sel_imov), |
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| 498 | .sel1 (cctype_sel_fmov), |
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| 499 | .sel2 (cctype_sel_bcc), |
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| 500 | .sel3 (cctype_sel_bpcc)); |
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| 501 | |
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| 502 | //------------- |
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| 503 | // ALU Controls |
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| 504 | //------------- |
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| 505 | // mov bit |
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| 506 | assign ifu_exu_aluop_d[2] = brsethi_inst & sethi_or_nop | // sethi |
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| 507 | arith_inst & op3_hi[2] & op3[3]; // mov, rd |
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| 508 | |
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| 509 | // aluop |
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| 510 | assign ifu_exu_aluop_d[1] = (arith_inst & |
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| 511 | ((op3_hi[3] & (op3_lo[0] | // wr |
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| 512 | op3_lo[2] | // wrpr |
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| 513 | op3_lo[3])) | // wrhpr |
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| 514 | (~op3[5] & op3[1])) // xor, or |
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| 515 | ); |
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| 516 | |
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| 517 | // aluop/mov type |
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| 518 | assign ifu_exu_aluop_d[0] = (arith_inst & |
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| 519 | ((op3_hi[3] & (op3_lo[0] | |
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| 520 | op3_lo[2] | |
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| 521 | op3_lo[3])) | // wr |
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| 522 | (~op3[5] & op3[0]) | // xor, and |
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| 523 | (op3_hi[2] & op3_lo[15])) // movr |
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| 524 | ); |
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| 525 | |
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| 526 | // invert rs2 |
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| 527 | assign ifu_exu_invert_d = arith_inst & |
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| 528 | (~op3[5] & op3[2] | // sub, andn, orn, xorn |
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| 529 | op3_hi[2] & (op3_lo[3] | op3_lo[1])); // tag sub |
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| 530 | |
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| 531 | assign ifu_exu_usecin_d = arith_inst & ~op3[5] & op3[3]; // addc, subc |
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| 532 | |
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| 533 | // tagged ops |
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| 534 | assign ifu_exu_tagop_d = arith_inst & op3_hi[2] & ~op3[3] & ~op3[2] & |
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| 535 | fcl_dtu_inst_vld_d; |
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| 536 | assign ifu_exu_tv_d = ifu_exu_tagop_d & op3[1]; |
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| 537 | assign ifu_exu_muls_d = arith_inst & op3_hi[2] & op3_lo[4] & |
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| 538 | ~swl_dec_divbusy_e & fcl_dtu_ely_inst_vld_d; |
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| 539 | |
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| 540 | // memory for ibr and ldst address range check |
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| 541 | assign ifu_exu_range_check_other_d = mem_inst & ~prefetch; // ld, st, atom |
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| 542 | assign ifu_exu_range_check_jlret_d = arith_inst & op3_hi[3] & |
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| 543 | (op3_lo[8] | op3_lo[9]); // jmpl, retn |
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| 544 | |
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| 545 | //-------------- |
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| 546 | // SHFT Controls |
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| 547 | //-------------- |
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| 548 | // enable shifter and choose shift output |
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| 549 | // This can be simplified a great deal if MULScc could also be |
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| 550 | // decoded as a shift instruction. |
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| 551 | // 9/26/01: No can do! Mulscc is implemented now |
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| 552 | assign ifu_exu_enshift_d = arith_inst & op3_hi[2] & |
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| 553 | (op3_lo[5] | op3_lo[6] | op3_lo[7]); |
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| 554 | // unsigned or signed (1 => signed) |
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| 555 | assign ifu_exu_shiftop_d[0] = op3[0]; |
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| 556 | // left or right (1 => right) |
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| 557 | assign ifu_exu_shiftop_d[1] = op3[1]; |
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| 558 | // shift 32b or 64b (1 => 64) |
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| 559 | assign ifu_exu_shiftop_d[2] = dtu_inst_d[12]; // was sh32_64 |
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| 560 | |
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| 561 | |
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| 562 | //------------------- |
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| 563 | // Writeback Controls |
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| 564 | //------------------- |
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| 565 | // write to icc/xcc |
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| 566 | assign ifu_exu_setcc_d = arith_inst & |
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| 567 | (op3_hi[1] & (~op3[3] | ~op3[1] & ~op3[0]) | |
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| 568 | op3_hi[2] & (~op3[3] & ~op3[2])); // tagged op |
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| 569 | // write to rd |
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| 570 | assign ifu_exu_wen_d = ((~rd_00) & brsethi_inst & sethi_or_nop | // sethi |
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| 571 | (~rd_00) & arith_inst & // all single cycle insts |
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| 572 | (~op3[5] & ~op3[3] | // alu ops |
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| 573 | ~op3[5] & op3_lo[8] | // addC |
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| 574 | ~op3[5] & op3_lo[12] | // subC |
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| 575 | op3_hi[2] & |
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| 576 | (~op3[3] & ~op3_lo[4] | // shft, tag, ~muls |
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| 577 | // need to kill if rd to invalid reg |
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| 578 | // all vld regs will retn in W stage |
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| 579 | op3_lo[8] & ~rs1_0f | op3_lo[10] | // rd |
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| 580 | op3_lo[9] | // rdhpr |
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| 581 | op3_lo[12] | op3_lo[15])| // mov |
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| 582 | op3_hi[3] & |
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| 583 | (op3_lo[8] | // jmpl |
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| 584 | op3_lo[12] | // save |
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| 585 | op3_lo[13] | // restore |
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| 586 | op3_lo[6] & int_align_d) // vis int align |
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| 587 | ) | |
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| 588 | call_inst); |
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| 589 | |
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| 590 | //----------------- |
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| 591 | // MUL/DIV Controls |
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| 592 | //----------------- |
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| 593 | // is mul |
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| 594 | assign dec_swl_mul_inst_d = (arith_inst & |
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| 595 | ((op3_hi[0] & |
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| 596 | (op3_lo[9] | // mulx |
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| 597 | op3_lo[10] | // umul |
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| 598 | op3_lo[11])) | // smul |
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| 599 | (op3_hi[1] & |
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| 600 | (op3_lo[10] | // umulcc |
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| 601 | op3_lo[11]))) // smulcc |
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| 602 | ); |
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| 603 | |
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| 604 | assign ifu_exu_muldivop_d[4] = dec_swl_mul_inst_d & ~swl_dec_mulbusy_e & |
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| 605 | fcl_dtu_ely_inst_vld_d; |
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| 606 | |
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| 607 | // is div |
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| 608 | assign dec_swl_div_inst_d = (arith_inst & |
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| 609 | ((op3_hi[0] & |
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| 610 | (op3_lo[13] | // udivx |
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| 611 | op3_lo[14] | // udiv |
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| 612 | op3_lo[15])) | // sdiv |
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| 613 | (op3_hi[2] & |
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| 614 | (op3_lo[13] | // sdivx |
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| 615 | op3_lo[4])) | // muls |
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| 616 | (op3_hi[1] & |
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| 617 | (op3_lo[14] | // udivcc |
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| 618 | op3_lo[15]))) // sdivcc |
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| 619 | ); |
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| 620 | |
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| 621 | assign ifu_exu_muldivop_d[3] = dec_swl_div_inst_d & ~swl_dec_divbusy_e & |
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| 622 | op3[3] & fcl_dtu_ely_inst_vld_d; // not muls |
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| 623 | |
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| 624 | // 64b or 32b (1 => 64b) |
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| 625 | assign ifu_exu_muldivop_d[2] = ~op3[1]; |
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| 626 | |
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| 627 | // signed or unsigned (1 => signed) |
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| 628 | assign ifu_exu_muldivop_d[1] = op3_hi[2] | // sdivx |
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| 629 | (op3[1] & op3[0]); // smul, sdiv |
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| 630 | // set cc as well? |
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| 631 | assign ifu_exu_muldivop_d[0] = op3[4]; |
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| 632 | |
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| 633 | //------------------------- |
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| 634 | // FP controls |
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| 635 | //------------------------- |
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| 636 | |
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| 637 | // portion of vis that is actually an int instruction |
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| 638 | assign int_align_d = (~opf[8] & ~opf[7] & ~opf[6] & ~opf[5] & |
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| 639 | opf[4] & opf[3] & ~opf[2] & ~opf[0]); |
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| 640 | assign ifu_exu_ialign_d = arith_inst & op3_hi[3] & op3_lo[6] & |
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| 641 | int_align_d & fcl_dtu_inst_vld_d; |
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| 642 | |
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| 643 | |
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| 644 | assign fpop1_d = arith_inst & op3_hi[3] & op3_lo[4]; |
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| 645 | assign fpop2_d = arith_inst & op3_hi[3] & op3_lo[5]; |
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| 646 | assign visop_d = arith_inst & op3_hi[3] & op3_lo[6]; |
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| 647 | assign fpld_d = mem_inst & op3[5] & ~op3[3] & ~op3[2]; |
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| 648 | |
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| 649 | // FP stores don't switch out and don't block the fpu |
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| 650 | assign dec_swl_fpop_d = (fpop1_d | fpop2_d | fpld_d | visop_d); |
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| 651 | assign allfp_d = (fpop1_d | fpop2_d | fpld_d | visop_d | |
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| 652 | mem_inst & op3[5] & ~op3[3] & op3[2]); |
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| 653 | assign dec_swl_allfp_d = allfp_d; |
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| 654 | |
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| 655 | assign ifu_ffu_ldfsr_d = op3_lo[1] & op3_hi[2] & ~rd[0]; |
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| 656 | assign ifu_ffu_ldxfsr_d = op3_lo[1] & op3_hi[2] & rd[0]; |
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| 657 | assign ifu_ffu_stfsr_d = op3_lo[5] & op3_hi[2]; |
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| 658 | |
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| 659 | assign ifu_ffu_fpop1_d = fpop1_d & ~swl_dec_fpbusy_e & |
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| 660 | fcl_dtu_ely_inst_vld_d; |
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| 661 | assign ifu_ffu_fpop2_d = fpop2_d & ~swl_dec_fpbusy_e & |
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| 662 | fcl_dtu_ely_inst_vld_d; |
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| 663 | assign ifu_ffu_visop_d = visop_d & ~swl_dec_fpbusy_e & |
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| 664 | fcl_dtu_ely_inst_vld_d; |
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| 665 | |
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| 666 | assign ifu_ffu_fld_d = mem_inst & op3[5] & ~op3[3] & ~op3[2] & |
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| 667 | fcl_dtu_ely_inst_vld_d & ~swl_dec_fpbusy_e; |
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| 668 | |
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| 669 | assign ifu_ffu_fst_d = mem_inst & op3[5] & ~op3[3] & op3[2] & |
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| 670 | fcl_dtu_ely_inst_vld_d & ~swl_dec_fpbusy_e; |
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| 671 | |
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| 672 | // ldqf and stqf are not fpops |
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| 673 | assign quad_ffuop_d = (opf[1] & opf[0] & (fpop1_d | fpop2_d) | |
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| 674 | fpop1_d & opf[3] & opf[2] & // exc div |
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| 675 | ~(~opf[7] & opf[6] & ~opf[5])) & |
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| 676 | swl_dec_fp_enable_d & fcl_dtu_inst_vld_d; |
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| 677 | |
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| 678 | dff_s #(1) qope_ff(.din (quad_ffuop_d), |
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| 679 | .q (ifu_ffu_quad_op_e), |
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| 680 | .clk (clk), .se(se), .si(), .so()); |
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| 681 | |
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| 682 | // quiet traps -- flush the pipe but don't take a trap till later |
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| 683 | // assign dec_swl_qtrap_d = mem_inst & op3[5] & op3_lo[6] & fcl_dtu_inst_vld_d; // stq |
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| 684 | // dff #(1) qtrpe_ff(.din (dec_swl_qtrap_d), |
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| 685 | // .q (dtu_fcl_qtrap_e), |
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| 686 | // .clk (clk), .se(se), .si(), .so()); |
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| 687 | |
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| 688 | // FP Enabled check |
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| 689 | assign fcc_branch_d = ~op[1] & ~op[0] & op3[5] & (op3[4] | op3[3]); |
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| 690 | assign fcc_mov_d = op[1] & ~op[0] & op3_hi[2] & op3_lo[12] & |
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| 691 | ~dtu_inst_d[18]; |
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| 692 | |
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| 693 | assign any_fpinst_d = allfp_d | fcc_branch_d | fcc_mov_d | |
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| 694 | arith_inst & op3_hi[2] & op3_lo[8] & rs1_13 | // rd gsr |
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| 695 | arith_inst & op3_hi[3] & op3_lo[0] & rd_13; // wr gsr |
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| 696 | |
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| 697 | assign fpdis_trap_d = any_fpinst_d & ~swl_dec_fp_enable_d & |
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| 698 | fcl_dtu_inst_vld_d; |
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| 699 | dff_s #(1) fpdise_ff(.din (fpdis_trap_d), |
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| 700 | .q (fpdis_trap_e), |
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| 701 | .clk (clk), .se(se), .si(), .so()); |
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| 702 | assign dtu_fcl_fpdis_e = fpdis_trap_e; |
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| 703 | |
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| 704 | // FRF dirty bits |
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| 705 | // bit 0 is the msb for double and quad |
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| 706 | assign dec_swl_frf_upper_d = rd[0] & (mem_inst & op3_lo[3] | // fld |
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| 707 | fpop1_d & (opf[7] | opf[6] & opf[5]) & |
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| 708 | (opf[3] | ~opf[2]) | |
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| 709 | fpop1_d & ~opf[7] & opf[1] & ~opf[0] | |
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| 710 | fpop2_d & opf[1] | |
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| 711 | visop_d & ~opf[0]); |
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| 712 | |
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| 713 | assign dec_swl_frf_lower_d = ~rd[0] & (mem_inst & op3_lo[3] | // fld |
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| 714 | fpop1_d & (opf[7] | opf[6] & opf[5]) & |
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| 715 | (opf[3] | ~opf[2]) | |
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| 716 | fpop1_d & ~opf[7] & opf[1] & ~opf[0] | |
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| 717 | fpop2_d & opf[1] | |
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| 718 | visop_d & ~opf[0]) | |
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| 719 | (fpop2_d & ~opf[1] | // all sgl ops wrt lower |
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| 720 | fpop1_d & opf[7] & ~opf[3] & opf[2] | |
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| 721 | //bug 6470 - fdtoi,fstoi,fqtoi |
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| 722 | (fpop1_d & (opf[7:6]==2'b11) & (opf[3:2]==2'b00)) | |
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| 723 | //bug6470 - end |
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| 724 | fpop1_d & ~opf[7] & ~opf[1] & opf[0] | |
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| 725 | visop_d & opf[0] | |
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| 726 | mem_inst & op3_lo[0] & op3[5]); |
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| 727 | |
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| 728 | |
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| 729 | //------------------------- |
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| 730 | // Special Reg R/W Controls |
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| 731 | //------------------------- |
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| 732 | // decode rs1 |
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| 733 | assign rs1 = dtu_inst_d[18:14]; |
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| 734 | assign rs1_00 = ~rs1[4] & ~rs1[3] & ~rs1[2] & ~rs1[1] & ~rs1[0]; // Y |
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| 735 | assign rs1_01 = ~rs1[4] & ~rs1[3] & ~rs1[2] & ~rs1[1] & rs1[0]; // |
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| 736 | assign rs1_02 = ~rs1[4] & ~rs1[3] & ~rs1[2] & rs1[1] & ~rs1[0]; // CCR |
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| 737 | assign rs1_05 = ~rs1[4] & ~rs1[3] & rs1[2] & ~rs1[1] & rs1[0]; // PC |
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| 738 | assign rs1_06 = ~rs1[4] & ~rs1[3] & rs1[2] & rs1[1] & ~rs1[0]; // fprs |
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| 739 | assign rs1_07 = ~rs1[4] & ~rs1[3] & rs1[2] & rs1[1] & rs1[0]; // |
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| 740 | assign rs1_0f = ~rs1[4] & rs1[3] & rs1[2] & rs1[1] & rs1[0]; // mem# |
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| 741 | assign rs1_10 = rs1[4] & ~rs1[3] & ~rs1[2] & ~rs1[1] & ~rs1[0]; |
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| 742 | assign rs1_12 = rs1[4] & ~rs1[3] & ~rs1[2] & rs1[1] & ~rs1[0]; |
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| 743 | assign rs1_13 = rs1[4] & ~rs1[3] & ~rs1[2] & rs1[1] & rs1[0]; |
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| 744 | assign rs1_14_15 = rs1[4] & ~rs1[3] & rs1[2] & ~rs1[1]; |
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| 745 | assign rs1_16_17 = rs1[4] & ~rs1[3] & rs1[2] & rs1[1]; |
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| 746 | assign rs1_19 = rs1[4] & rs1[3] & ~rs1[2] & ~rs1[1] & rs1[0]; |
---|
| 747 | assign rs1_1f = rs1[4] & rs1[3] & rs1[2] & rs1[1] & rs1[0]; // |
---|
| 748 | assign rs1_1a = rs1[4] & rs1[3] & ~rs1[2] & rs1[1] & ~rs1[0]; // THR |
---|
| 749 | assign rs1_1b = rs1[4] & rs1[3] & ~rs1[2] & rs1[1] & rs1[0]; |
---|
| 750 | assign rs1_1c_1f = rs1[4] & rs1[3] & rs1[2]; |
---|
| 751 | assign rs1_09_0e = ~rs1[4] & rs1[3] & // all window mgmt regs |
---|
| 752 | (rs1[2] & ~rs1[1] | rs1[1] & ~rs1[0] | |
---|
| 753 | rs1[0] & ~rs1[2]); |
---|
| 754 | |
---|
| 755 | // decode rd |
---|
| 756 | assign rd = dtu_inst_d[29:25]; |
---|
| 757 | assign rd_00 = ~rd[4] & ~rd[3] & ~rd[2] & ~rd[1] & ~rd[0]; // mem# |
---|
| 758 | assign rd_01 = ~rd[4] & ~rd[3] & ~rd[2] & ~rd[1] & rd[0]; // |
---|
| 759 | assign rd_04 = ~rd[4] & ~rd[3] & rd[2] & ~rd[1] & ~rd[0]; // tick |
---|
| 760 | assign rd_05 = ~rd[4] & ~rd[3] & rd[2] & ~rd[1] & rd[0]; // PC |
---|
| 761 | assign rd_06 = ~rd[4] & ~rd[3] & rd[2] & rd[1] & ~rd[0]; |
---|
| 762 | assign rd_07 = ~rd[4] & ~rd[3] & rd[2] & rd[1] & rd[0]; |
---|
| 763 | assign rd_09 = ~rd[4] & rd[3] & ~rd[2] & ~rd[1] & rd[0]; // CWP |
---|
| 764 | assign rd_0f = ~rd[4] & rd[3] & rd[2] & rd[1] & rd[0]; // not impl |
---|
| 765 | assign rd_10 = rd[4] & ~rd[3] & ~rd[2] & ~rd[1] & ~rd[0]; // gl |
---|
| 766 | assign rd_11 = rd[4] & ~rd[3] & ~rd[2] & ~rd[1] & rd[0]; // pic |
---|
| 767 | assign rd_12 = rd[4] & ~rd[3] & ~rd[2] & rd[1] & ~rd[0]; // not impl |
---|
| 768 | assign rd_13 = rd[4] & ~rd[3] & ~rd[2] & rd[1] & rd[0]; // GSR |
---|
| 769 | assign rd_18 = rd[4] & rd[3] & ~rd[2] & ~rd[1] & ~rd[0]; // stick |
---|
| 770 | assign rd_1a = rd[4] & rd[3] & ~rd[2] & rd[1] & ~rd[0]; // Thr |
---|
| 771 | assign rd_1b = rd[4] & rd[3] & ~rd[2] & rd[1] & rd[0]; |
---|
| 772 | assign rd_1c_1f = rd[4] & rd[3] & rd[2]; |
---|
| 773 | assign rd_1f = rd[4] & rd[3] & rd[2] & rd[1] & rd[0]; |
---|
| 774 | |
---|
| 775 | assign ifu_lsu_wsr_inst_d = arith_inst & fcl_dtu_ely_inst_vld_d & |
---|
| 776 | op3_hi[3] & (op3_lo[0] | op3_lo[2] | op3_lo[3]); |
---|
| 777 | assign ifu_exu_wsr_inst_d = ifu_lsu_wsr_inst_d; |
---|
| 778 | |
---|
| 779 | assign ifu_tlu_rsr_inst_d = arith_inst & fcl_dtu_ely_inst_vld_d & |
---|
| 780 | op3_hi[2] & (op3_lo[8] & ~rs1_0f | // ~membar |
---|
| 781 | op3_lo[9] | // hpr |
---|
| 782 | op3_lo[10]); // pr |
---|
| 783 | |
---|
| 784 | assign rdsr_done_d = arith_inst & op3_hi[2] & op3_lo[8] & ~mb_inst_d; |
---|
| 785 | assign rdpr_done_d = arith_inst & op3_hi[2] & (op3_lo[10] | op3_lo[9]); |
---|
| 786 | |
---|
| 787 | // all wrpr's except cwp are fixed length |
---|
| 788 | // |
---|
| 789 | assign wsr_fixed_inst_d = arith_inst & op3_hi[3] & |
---|
| 790 | (op3_lo[2] & ~rd_09 | // wrpr exc. cwp |
---|
| 791 | op3_lo[0] & ~rd_1a | // wr exc. thr |
---|
| 792 | op3_lo[3]); // wrhpr |
---|
| 793 | |
---|
| 794 | |
---|
| 795 | dff_s #(1) wre_ff(.din (wsr_fixed_inst_d), |
---|
| 796 | .clk (clk), |
---|
| 797 | .q (wsr_fixed_inst_e), |
---|
| 798 | .se (se), .si(), .so()); |
---|
| 799 | |
---|
| 800 | assign wsr_inst_next_e = (~dtu_inst_anull_e) & wsr_fixed_inst_e & |
---|
| 801 | fcl_dtu_inst_vld_e; |
---|
| 802 | |
---|
| 803 | dff_s #(1) wrm_ff(.din (wsr_inst_next_e), |
---|
| 804 | .clk (clk), |
---|
| 805 | .q (wsr_fixed_inst_m), |
---|
| 806 | .se (se), .si(), .so()); |
---|
| 807 | |
---|
| 808 | dff_s #(1) wrw_ff(.din (wsr_fixed_inst_m), |
---|
| 809 | .clk (clk), |
---|
| 810 | .q (wsr_fixed_inst_w), |
---|
| 811 | .se (se), .si(), .so()); |
---|
| 812 | |
---|
| 813 | assign use_rsr_d_l = ~(ifu_tlu_rsr_inst_d | ibr_inst_d | call_inst); |
---|
| 814 | |
---|
| 815 | dff_s #(1) rdsre_ff(.din (use_rsr_d_l), |
---|
| 816 | .clk (clk), |
---|
| 817 | .q (ifu_exu_use_rsr_e_l), |
---|
| 818 | .se (se), .si(), .so()); |
---|
| 819 | |
---|
| 820 | assign flush_inst_d = fcl_dtu_inst_vld_d & arith_inst & |
---|
| 821 | op3_hi[3] & op3_lo[11]; |
---|
| 822 | |
---|
| 823 | dff_s #(1) flsh_ff(.din (flush_inst_d), |
---|
| 824 | .q (ifu_tlu_flsh_inst_e), |
---|
| 825 | .clk (clk), |
---|
| 826 | .se (se), .si(), .so()); |
---|
| 827 | |
---|
| 828 | |
---|
| 829 | // If machine state is changed kill the already fetched instructions |
---|
| 830 | assign state_chg_inst_d = ifu_lsu_wsr_inst_d | flush_inst_d | |
---|
| 831 | ifu_tlu_done_inst_d | ifu_tlu_retry_inst_d; |
---|
| 832 | |
---|
| 833 | |
---|
| 834 | dff_s #(1) schg_ff(.din (state_chg_inst_d), |
---|
| 835 | .clk (clk), |
---|
| 836 | .q (state_chg_inst_e), |
---|
| 837 | // .rst (reset), |
---|
| 838 | .se (se), .si(), .so()); |
---|
| 839 | |
---|
| 840 | // assign sta_inst_d = mem_inst & op3[4] & fcl_dtu_inst_vld_d & |
---|
| 841 | // (~op3[5] & ~op3[3] & op3[2] | |
---|
| 842 | // op3[5] & (op3_lo[4] | op3_lo[7]) | |
---|
| 843 | // ~op3[5] & op3_lo[14]); |
---|
| 844 | assign sta_inst_d = mem_inst & op3[4] & op3[2] & fcl_dtu_inst_vld_d & ~prefetch; |
---|
| 845 | |
---|
| 846 | assign sta_nostf_d = mem_inst & op3[4] & fcl_dtu_inst_vld_d & |
---|
| 847 | (~op3[5] & ~op3[3] & op3[2] | |
---|
| 848 | ~op3[5] & op3_lo[14]); |
---|
| 849 | |
---|
| 850 | dff_s #(1) sta_ff (.din (sta_inst_d), |
---|
| 851 | .clk (clk), |
---|
| 852 | .q (sta_inst_e), |
---|
| 853 | .se (se), .si(), .so()); |
---|
| 854 | |
---|
| 855 | dff_s #(1) stanf_ff (.din (sta_nostf_d), |
---|
| 856 | .clk (clk), |
---|
| 857 | .q (sta_nostf_e), |
---|
| 858 | .se (se), .si(), .so()); |
---|
| 859 | |
---|
| 860 | assign dec_swl_sta_inst_e = sta_nostf_e; |
---|
| 861 | |
---|
| 862 | // Mov qualification with inst_vld_e to FCL? Done |
---|
| 863 | assign dtu_fcl_flush_sonly_e = (sta_inst_e & lsu_ifu_ldsta_internal_e | |
---|
| 864 | state_chg_inst_e); |
---|
| 865 | |
---|
| 866 | dff_s #(1) ds_ff(.din (fcl_dec_dslot_s), |
---|
| 867 | .q (dslot_d), |
---|
| 868 | .clk (clk), .se(se), .si(), .so()); |
---|
| 869 | |
---|
| 870 | // suppress ifetch if arch state changes in delay slot (if not |
---|
| 871 | // suppressed, it may cause in error in the L2 for an unmapped |
---|
| 872 | // address). |
---|
| 873 | // assign dtu_ifq_kill_latest_d = ifu_lsu_wsr_inst_d | flush_inst_d | |
---|
| 874 | // ifu_tlu_done_inst_d | ifu_tlu_retry_inst_d | |
---|
| 875 | // sta_inst_d; |
---|
| 876 | assign dtu_ifq_kill_latest_d = (((arith_inst & op3_hi[3] & |
---|
| 877 | (op3_lo[2] | op3_lo[3] | op3_lo[0]) |// wr |
---|
| 878 | mem_inst & op3[4] & op3[2]) & |
---|
| 879 | fcl_dtu_ely_inst_vld_d) | |
---|
| 880 | fcl_dec_intr_vld_d) & dslot_d; // in DS |
---|
| 881 | |
---|
| 882 | // assign kill_for_sta_d = mem_inst & op3[4] & op3[2] & |
---|
| 883 | // ~op3[5] & // sta - excl stf and pref |
---|
| 884 | // fcl_dtu_ely_inst_vld_d & dslot_d; // in DS |
---|
| 885 | |
---|
| 886 | // dff #(1) kfste_ff(.din (kill_for_sta_d), |
---|
| 887 | // .q (kill_for_sta_e), |
---|
| 888 | // .clk (clk), .se(se), .si(), .so()); |
---|
| 889 | // assign dec_fcl_kill4sta_e = kill_for_sta_e; |
---|
| 890 | |
---|
| 891 | assign rd_ifusr_d = arith_inst & op3_hi[2] & |
---|
| 892 | (op3_lo[9] & rs1_06 | // rdhpr - ver |
---|
| 893 | op3_lo[8] & (rs1_05 | // rdsr - pc |
---|
| 894 | rs1_1a | // rdsr - thr |
---|
| 895 | rs1_06)) | // rdsr - fprs |
---|
| 896 | jmpl_inst_d | // jmpl |
---|
| 897 | call_inst; // call |
---|
| 898 | |
---|
| 899 | assign rd_exusr_d = arith_inst & op3_hi[2] & |
---|
| 900 | (op3_lo[10] & rs1_09_0e | // rdpr (wind) |
---|
| 901 | op3_lo[8] & (rs1_00 | rs1_02)); // rdsr (y + ccr) |
---|
| 902 | |
---|
| 903 | assign rd_ffusr_d = arith_inst & op3_hi[2] & |
---|
| 904 | op3_lo[8] & rs1_13; // rdsr (gsr) |
---|
| 905 | |
---|
| 906 | dff_s #(1) ifusr_ff(.din (rd_ifusr_d), |
---|
| 907 | .clk (clk), |
---|
| 908 | .q (rd_ifusr_e), |
---|
| 909 | .se (se), .si(), .so()); |
---|
| 910 | dff_s #(1) ffusr_ff(.din (rd_ffusr_d), |
---|
| 911 | .clk (clk), |
---|
| 912 | .q (rd_ffusr_e), |
---|
| 913 | .se (se), .si(), .so()); |
---|
| 914 | dff_s #(1) exusr_ff(.din (rd_exusr_d), |
---|
| 915 | .clk (clk), |
---|
| 916 | .q (rd_exusr_e), |
---|
| 917 | .se (se), .si(), .so()); |
---|
| 918 | |
---|
| 919 | // make sure they are exclusive |
---|
| 920 | assign ifu_exu_rd_ifusr_e = rd_ifusr_e; |
---|
| 921 | assign ifu_exu_rd_exusr_e = rd_exusr_e; |
---|
| 922 | assign ifu_exu_rd_ffusr_e = rd_ffusr_e; |
---|
| 923 | |
---|
| 924 | // choose which of IFU special regs should be read |
---|
| 925 | // call, jmpl or rdpc (05) => pc |
---|
| 926 | assign dec_fcl_rdsr_sel_pc_d = ~dtu_inst_d[31] | op3_hi[3] | ~rs1[1] & rs1[0]; |
---|
| 927 | // read thread conf (1a) or fprs (06) |
---|
| 928 | assign dec_fcl_rdsr_sel_thr_d = dtu_inst_d[31] & op3_hi[2] & op3_lo[8] & ~rs1[0]; |
---|
| 929 | // else version reg (rdhpr 06) |
---|
| 930 | |
---|
| 931 | // dff #(1) rdfprs_ff(.din (rs1[4]), |
---|
| 932 | // .q (dec_swl_rdsr_sel_thr_e), |
---|
| 933 | // .clk (clk), .se(se), .si(), .so()); |
---|
| 934 | assign dec_swl_rdsr_sel_thr_d = rs1[4]; |
---|
| 935 | |
---|
| 936 | assign wrt_tcr_d = arith_inst & fcl_dtu_inst_vld_d & |
---|
| 937 | op3_hi[3] & op3_lo[0] & rd_1a; |
---|
| 938 | |
---|
| 939 | dff_s #(1) tcre_ff(.din (wrt_tcr_d), |
---|
| 940 | .clk (clk), |
---|
| 941 | .q (wrt_tcr_e), |
---|
| 942 | .se (se), .si(), .so()); |
---|
| 943 | |
---|
| 944 | assign wrt_tcr_qual_e = wrt_tcr_e & (~dtu_inst_anull_e) & |
---|
| 945 | fcl_dtu_inst_vld_e; |
---|
| 946 | |
---|
| 947 | dff_s #(1) tcrm_ff(.din (wrt_tcr_qual_e), |
---|
| 948 | .clk (clk), |
---|
| 949 | .q (wrt_tcr_m), |
---|
| 950 | .se (se), .si(), .so()); |
---|
| 951 | |
---|
| 952 | dff_s #(1) tcrw_ff(.din (wrt_tcr_m), |
---|
| 953 | .clk (clk), |
---|
| 954 | .q (dec_swl_wrt_tcr_w), |
---|
| 955 | .se (se), .si(), .so()); |
---|
| 956 | |
---|
| 957 | // FPRS write |
---|
| 958 | assign wrt_fprs_d = arith_inst & fcl_dtu_inst_vld_d & |
---|
| 959 | op3_hi[3] & op3_lo[0] & rd_06; |
---|
| 960 | dff_s #(1) fprse_ff(.din (wrt_fprs_d), |
---|
| 961 | .clk (clk), |
---|
| 962 | .q (wrt_fprs_e), |
---|
| 963 | .se (se), .si(), .so()); |
---|
| 964 | assign wrt_fprs_qual_e = wrt_fprs_e & (~dtu_inst_anull_e) & |
---|
| 965 | fcl_dtu_inst_vld_e; |
---|
| 966 | dff_s #(1) fprsm_ff(.din (wrt_fprs_qual_e), |
---|
| 967 | .clk (clk), |
---|
| 968 | .q (wrt_fprs_m), |
---|
| 969 | .se (se), .si(), .so()); |
---|
| 970 | dff_s #(1) fprsw_ff(.din (wrt_fprs_m), |
---|
| 971 | .clk (clk), |
---|
| 972 | .q (dec_swl_wrtfprs_w), |
---|
| 973 | .se (se), .si(), .so()); |
---|
| 974 | |
---|
| 975 | //---------------- |
---|
| 976 | // RF/RML Controls |
---|
| 977 | //---------------- |
---|
| 978 | // Reg Valid Signals for doing ECC |
---|
| 979 | |
---|
| 980 | //bug6777 - cas decode is incorrect |
---|
| 981 | // ~(op3_hi[3] & dtu_inst_d[22] & mem_inst); // CAS |
---|
| 982 | assign ifu_exu_useimm_d = ~dtu_inst_d[31] | |
---|
| 983 | dtu_inst_d[13] & |
---|
| 984 | ~(op3_hi[3] & dtu_inst_d[22] & ~op3[0] & mem_inst); // CAS |
---|
| 985 | |
---|
| 986 | // alternately try: ~ren2_d | ~23 | ~22 |
---|
| 987 | assign rs1_vld_d = (brsethi_inst & op2[1] & op2[0] | |
---|
| 988 | arith_inst & (~op3[5] | |
---|
| 989 | op3_hi[2] & ~op3[3] | |
---|
| 990 | op3_hi[2] & op3_lo[13] | |
---|
| 991 | op3_hi[2] & op3_lo[15] | |
---|
| 992 | op3_hi[3] & op3_lo[0] | |
---|
| 993 | op3_hi[3] & op3_lo[2] | |
---|
| 994 | op3_hi[3] & op3_lo[3] | |
---|
| 995 | op3_hi[3] & op3_lo[5] & |
---|
| 996 | ~opf[4] & ~opf[3] & opf[2] | // fmovr |
---|
| 997 | op3_hi[3] & op3_lo[6] & int_align_d | |
---|
| 998 | op3_hi[3] & op3[3] & ~op3[2] | |
---|
| 999 | op3_hi[3] & op3[3] & ~op3[1]) | |
---|
| 1000 | mem_inst & (~op3[5] | |
---|
| 1001 | ~op3[3] | |
---|
| 1002 | op3[4] & op3[3] & op3[2])); |
---|
| 1003 | |
---|
| 1004 | assign ifu_exu_rs1_vld_d = rs1_vld_d; |
---|
| 1005 | |
---|
| 1006 | assign rs2_vld_d = (arith_inst & (~op3[5] | |
---|
| 1007 | op3_hi[2] & (~op3[3] | op3[2]) | |
---|
| 1008 | op3_hi[3] & op3_lo[0] | |
---|
| 1009 | op3_hi[3] & op3_lo[2] | |
---|
| 1010 | op3_hi[3] & op3_lo[3] | |
---|
| 1011 | op3_hi[3] & op3_lo[6] & int_align_d | |
---|
| 1012 | op3_hi[3] & op3[3] & ~op3[2] | |
---|
| 1013 | op3_hi[3] & op3[3] & ~op3[1]) & |
---|
| 1014 | ~dtu_inst_d[13] | |
---|
| 1015 | mem_inst & (~op3[5] | |
---|
| 1016 | ~op3[3]) & ~dtu_inst_d[13] | |
---|
| 1017 | mem_inst & op3_hi[3] & (op3_lo[12] | // cas |
---|
| 1018 | op3_lo[14])); |
---|
| 1019 | |
---|
| 1020 | assign ifu_exu_rs2_vld_d = rs2_vld_d; |
---|
| 1021 | |
---|
| 1022 | assign rs3_vld_d = mem_inst & (~op3[5] & ~op3[3] & op3[2] | // all st |
---|
| 1023 | ~op3[5] & op3[3] & op3[2] | // swp,stx,ldstub |
---|
| 1024 | op3_hi[3] & (op3_lo[12] | // cas |
---|
| 1025 | op3_lo[14])) | |
---|
| 1026 | arith_inst & (op3_hi[2] & (op3_lo[12] | |
---|
| 1027 | op3_lo[15])); |
---|
| 1028 | |
---|
| 1029 | // for std and stq(=stda) & ~stf |
---|
| 1030 | assign rs4_vld_d = mem_inst & ~op3[5] & op3_lo[7]; |
---|
| 1031 | |
---|
| 1032 | // rs3even = rs4 + rs3 & ~rd[0] |
---|
| 1033 | // rs3odd = rs4 + rs3 & rd[0] |
---|
| 1034 | // needs both to distinguish std |
---|
| 1035 | assign ifu_exu_rs3e_vld_d = rs4_vld_d | rs3_vld_d & ~rd[0]; |
---|
| 1036 | assign ifu_exu_rs3o_vld_d = rs4_vld_d | rs3_vld_d & rd[0]; |
---|
| 1037 | |
---|
| 1038 | // RML control signals |
---|
| 1039 | assign ifu_exu_save_d = arith_inst & op3_hi[3] & op3_lo[12] & |
---|
| 1040 | fcl_dtu_inst_vld_d; |
---|
| 1041 | assign ifu_exu_restore_d = arith_inst & op3_hi[3] & fcl_dtu_inst_vld_d & |
---|
| 1042 | (op3_lo[13] | // restore |
---|
| 1043 | op3_lo[9]); // return |
---|
| 1044 | assign ifu_exu_return_d = arith_inst & op3_hi[3] & op3_lo[9] & |
---|
| 1045 | fcl_dtu_inst_vld_d; |
---|
| 1046 | |
---|
| 1047 | assign save_retn_done_d = arith_inst & op3_hi[3] & (op3_lo[12] | op3_lo[9]); |
---|
| 1048 | assign saved_d = arith_inst & op3_hi[3] & op3_lo[1] & ~dtu_inst_d[25] & |
---|
| 1049 | fcl_dtu_inst_vld_d; |
---|
| 1050 | assign restored_d = arith_inst & op3_hi[3] & op3_lo[1] & dtu_inst_d[25] & |
---|
| 1051 | fcl_dtu_inst_vld_d; |
---|
| 1052 | assign flushw_d = arith_inst & op3_hi[2] & op3_lo[11] & fcl_dtu_inst_vld_d; |
---|
| 1053 | |
---|
| 1054 | dff_s #(1) savd_ff(.din (saved_d), |
---|
| 1055 | .clk (clk), |
---|
| 1056 | .q (ifu_exu_saved_e), |
---|
| 1057 | .se (se), .si(), .so()); |
---|
| 1058 | dff_s #(1) restd_ff(.din (restored_d), |
---|
| 1059 | .clk (clk), |
---|
| 1060 | .q (ifu_exu_restored_e), |
---|
| 1061 | .se (se), .si(), .so()); |
---|
| 1062 | dff_s #(1) flushw_ff(.din (flushw_d), |
---|
| 1063 | .clk (clk), |
---|
| 1064 | .q (ifu_exu_flushw_e), |
---|
| 1065 | .se (se), .si(), .so()); |
---|
| 1066 | |
---|
| 1067 | //----------------------- |
---|
| 1068 | // TLU Controls and Traps |
---|
| 1069 | //----------------------- |
---|
| 1070 | // Done/Retry |
---|
| 1071 | assign ifu_tlu_done_inst_d = arith_inst & op3_hi[3] & op3_lo[14] & |
---|
| 1072 | fcl_dtu_ely_inst_vld_d & |
---|
| 1073 | ~dtu_inst_d[25]; // inst_d[25] = lsb of fcn |
---|
| 1074 | assign ifu_tlu_retry_inst_d = arith_inst & op3_hi[3] & op3_lo[14] & |
---|
| 1075 | fcl_dtu_ely_inst_vld_d & dtu_inst_d[25]; |
---|
| 1076 | |
---|
| 1077 | // SIR |
---|
| 1078 | assign sir_inst_d = arith_inst & op3_hi[3] & op3_lo[0] & |
---|
| 1079 | rs1_00 & rd_0f & dtu_inst_d[13]; |
---|
| 1080 | |
---|
| 1081 | // assign kill_sir_d = sir_inst_d & ~(fcl_dtu_privmode_d | fcl_dtu_hprivmode_d); |
---|
| 1082 | //bug 6484 - flag sir instrn. to tlu only in hpriv mode |
---|
| 1083 | // assign flag_sir_d = sir_inst_d & (fcl_dtu_privmode_d | fcl_dtu_hprivmode_d); |
---|
| 1084 | |
---|
| 1085 | assign flag_sir_d = sir_inst_d & fcl_dtu_hprivmode_d; |
---|
| 1086 | |
---|
| 1087 | dff_s #(1) sire_ff(.din (flag_sir_d), |
---|
| 1088 | .q (sir_inst_e), |
---|
| 1089 | .clk (clk), .se(se), .si(), .so()); |
---|
| 1090 | assign dtu_fcl_sir_inst_e = sir_inst_e; |
---|
| 1091 | |
---|
| 1092 | //bug 6484 - kill sir instrn. to tlu if bits other than opcode bits cause illegal instrn. |
---|
| 1093 | // assign flag_sir_e = sir_inst_e & fcl_dtu_inst_vld_e & ~dtu_inst_anull_e; |
---|
| 1094 | |
---|
| 1095 | assign flag_sir_e = sir_inst_e & fcl_dtu_inst_vld_e & ~dtu_inst_anull_e & ~ill_inst_e; |
---|
| 1096 | |
---|
| 1097 | dff_s #(1) sirm_ff(.din (flag_sir_e), |
---|
| 1098 | .q (ifu_tlu_sir_inst_m), |
---|
| 1099 | .clk (clk), .se(se), .si(), .so()); |
---|
| 1100 | |
---|
| 1101 | |
---|
| 1102 | // Privileged opcode trap |
---|
| 1103 | assign fcn0 = ~rd[4] & ~rd[3] & ~rd[2] & ~rd[1]; |
---|
| 1104 | |
---|
| 1105 | //op3_lo[0] & rd[4] & ~(rd_12 | rd_13 | |
---|
| 1106 | //rd[3] & ~rd_1a | |
---|
| 1107 | //rd_1f)) | |
---|
| 1108 | |
---|
| 1109 | assign privop_d = (op3_hi[3] & (op3_lo[14] | // done/retr |
---|
| 1110 | op3_lo[2] | // wrpr |
---|
| 1111 | // & (~rd[4] & ~rd_0f | rd_10) | |
---|
| 1112 | // op3_lo[3] | // wrhpr |
---|
| 1113 | // & valid_hp_rd_d | |
---|
| 1114 | op3_lo[1] | // savd,restd |
---|
| 1115 | op3_lo[0] & ((rd[4] & ~(rd_11 | rd_12 | rd_13 | rd_1b | |
---|
| 1116 | rd[3] & rd[2])) | |
---|
| 1117 | rd_04)) | // wrasr |
---|
| 1118 | |
---|
| 1119 | op3_hi[2] & (op3_lo[10] | // rdpr |
---|
| 1120 | // & (~rs1[4] | rs1_10 | rs1_1f) | |
---|
| 1121 | // op3_lo[9] | // rdhpr |
---|
| 1122 | // & valid_hp_rs_d | |
---|
| 1123 | op3_lo[8] & // rdasr & ~mem# |
---|
| 1124 | (rs1_10 | rs1_16_17 | // perf + sftint |
---|
| 1125 | rs1_19 | rs1_1a)) // stick, thrd stat |
---|
| 1126 | ) & arith_inst & ~(fcl_dtu_privmode_d | |
---|
| 1127 | fcl_dtu_hprivmode_d); |
---|
| 1128 | |
---|
| 1129 | // hp regs 0,1,3 and 5, 6 and 1f are implemented |
---|
| 1130 | // 6 is read only |
---|
| 1131 | |
---|
| 1132 | assign valid_hp_rd_d = (~rd[4] & ~rd[3] & rd[0] & |
---|
| 1133 | (~rd[2] | ~rd[1]) | // 1,3,5 |
---|
| 1134 | rd_00 | rd_1f ); // 0, 1f |
---|
| 1135 | assign valid_hp_rs_d = (~rs1[4] & ~rs1[3] & rs1[0] & |
---|
| 1136 | (~rs1[2] | ~rs1[1]) | |
---|
| 1137 | rs1_00 | rs1_06 | rs1_1f); |
---|
| 1138 | |
---|
| 1139 | assign hprivop_d = arith_inst & ~fcl_dtu_hprivmode_d & |
---|
| 1140 | (op3_hi[3] & op3_lo[3] | // wrhpr |
---|
| 1141 | // & valid_hp_rd_d |
---|
| 1142 | op3_hi[2] & op3_lo[9] | // rdhpr |
---|
| 1143 | // & valid_hp_rs_d |
---|
| 1144 | // bug 6484 ---- |
---|
| 1145 | sir_inst_d | |
---|
| 1146 | // ---- |
---|
| 1147 | op3_hi[3] & op3_lo[0] & |
---|
| 1148 | (rd_04 | rd_18) & fcl_dtu_privmode_d | // wrsr s/tick |
---|
| 1149 | op3_hi[3] & op3_lo[2] & |
---|
| 1150 | rd_04 & fcl_dtu_privmode_d); // wrpr |
---|
| 1151 | |
---|
| 1152 | dff_s #(1) prope_ff(.din (privop_d), |
---|
| 1153 | .q (privop_e), |
---|
| 1154 | .clk (clk), .se(se), .si(), .so()); |
---|
| 1155 | |
---|
| 1156 | dff_s #(1) hprope_ff(.din (hprivop_d), |
---|
| 1157 | .q (hprivop_e), |
---|
| 1158 | .clk (clk), .se(se), .si(), .so()); |
---|
| 1159 | assign dtu_fcl_privop_e = privop_e & ~hprivop_e; |
---|
| 1160 | // assign dtu_fcl_hprivop_e = hprivop_e & ~dtu_inst_anull_e; |
---|
| 1161 | |
---|
| 1162 | // Illegal Instruction Trap |
---|
| 1163 | // when they are accessed. |
---|
| 1164 | assign inv_reg_access_d = arith_inst & (op3_hi[2] & op3_lo[8] & // rd asr |
---|
| 1165 | (rs1_01 | rs1_07 | // 1, 7 |
---|
| 1166 | ~rs1[4] & rs1[3] & ~rs1_0f | // 8-E, F=mem# |
---|
| 1167 | rs1_12 | rs1_14_15 | // 13 is gsr |
---|
| 1168 | // 14-15 are WO |
---|
| 1169 | rs1_1b | |
---|
| 1170 | rs1_1c_1f) | |
---|
| 1171 | |
---|
| 1172 | op3_hi[3] & op3_lo[0] & // wr asr |
---|
| 1173 | (rd_01 | rd_05 | rd_07 | |
---|
| 1174 | ~rd[4] & rd[3] & ~rd_0f | // 8-E, F is sir |
---|
| 1175 | rd_12 | rd_1b | |
---|
| 1176 | rd_1c_1f) |
---|
| 1177 | ); |
---|
| 1178 | |
---|
| 1179 | // reserved field checking (more done in ill_inst check below) |
---|
| 1180 | assign inst12_5_nonzero_d = (|dtu_inst_d[12:5]); |
---|
| 1181 | assign inst11_8_nonzero_d = (|dtu_inst_d[11:8]); |
---|
| 1182 | assign inst9_5_nonzero_d = (|dtu_inst_d[9:5]); |
---|
| 1183 | assign rs2_nonzero_d = (|dtu_inst_d[4:0]); |
---|
| 1184 | |
---|
| 1185 | // rsv check is not complete, but most of the important |
---|
| 1186 | // holes are covered |
---|
| 1187 | assign rsvchk_fail_d = (arith_inst & ((~op3[5] | // arith |
---|
| 1188 | op3_hi[2] & op3_lo[13] | // sdivx |
---|
| 1189 | op3_hi[2] & ~op3[3] & ~op3[2] | // tag |
---|
| 1190 | op3_hi[2] & op3_lo[4] | // mulscc |
---|
| 1191 | op3_hi[3] & op3_lo[11] | // flsh |
---|
| 1192 | op3_hi[3] & op3[3] & ~op3[1]) & // sav,jmp |
---|
| 1193 | ~dtu_inst_d[13] & inst12_5_nonzero_d | |
---|
| 1194 | |
---|
| 1195 | op3_hi[2] & (op3[3] & ~op3[2] & // rd/rdpr |
---|
| 1196 | ~(rs1_0f & |
---|
| 1197 | dtu_inst_d[13]) | // ~mem# |
---|
| 1198 | op3_lo[11]) & // flshw |
---|
| 1199 | (inst12_5_nonzero_d | |
---|
| 1200 | rs2_nonzero_d | |
---|
| 1201 | dtu_inst_d[13]) | |
---|
| 1202 | |
---|
| 1203 | op3_hi[3] & ~op3[3] & ~op3[2] & // wr/pr |
---|
| 1204 | ~rd_0f & // ~sir |
---|
| 1205 | ~dtu_inst_d[13] & inst12_5_nonzero_d | |
---|
| 1206 | |
---|
| 1207 | op3_hi[2] & op3_lo[12] & // movcc |
---|
| 1208 | ~dtu_inst_d[13] & |
---|
| 1209 | (inst9_5_nonzero_d | dtu_inst_d[10]) | |
---|
| 1210 | |
---|
| 1211 | op3_hi[2] & op3_lo[15] & // movr |
---|
| 1212 | ~dtu_inst_d[13] & |
---|
| 1213 | inst9_5_nonzero_d | |
---|
| 1214 | |
---|
| 1215 | op3_hi[3] & op3_lo[11] & // flsh |
---|
| 1216 | ~rd_00 | |
---|
| 1217 | |
---|
| 1218 | op3_hi[2] & op3_lo[11] & // flshw |
---|
| 1219 | (~rd_00 | ~rs1_00) | |
---|
| 1220 | |
---|
| 1221 | op3_hi[2] & |
---|
| 1222 | (op3_lo[5] | op3_lo[6] | |
---|
| 1223 | op3_lo[7]) & // shft |
---|
| 1224 | (inst11_8_nonzero_d | |
---|
| 1225 | dtu_inst_d[7] | |
---|
| 1226 | dtu_inst_d[6] | |
---|
| 1227 | dtu_inst_d[5] & (~dtu_inst_d[12] | |
---|
| 1228 | ~dtu_inst_d[13])) |
---|
| 1229 | ) | |
---|
| 1230 | |
---|
| 1231 | mem_inst & (~op3[4] & ~dtu_inst_d[13] & // ld/st |
---|
| 1232 | inst12_5_nonzero_d | |
---|
| 1233 | op3_hi[3] & |
---|
| 1234 | (op3_lo[12] | op3_lo[14]) & // cas |
---|
| 1235 | dtu_inst_d[13] & inst12_5_nonzero_d) | |
---|
| 1236 | |
---|
| 1237 | ((op[1] & ~op[0]) & (op3[5] & op3[4] & op3[3] & ~op3[2] & ~op3[1] & op3[0]) & |rd) // RETURN(rd != 0), bug 4490 |
---|
| 1238 | |
---|
| 1239 | ); |
---|
| 1240 | |
---|
| 1241 | |
---|
| 1242 | |
---|
| 1243 | assign ill_inst_d = (brsethi_inst & (~op2[2] & ~op2[1] & ~op2[0] | // ill inst |
---|
| 1244 | op2[2] & op2[1] & op2[0] | // null |
---|
| 1245 | op2[1] & op2[0] & // wrong bpr cond |
---|
| 1246 | (~dtu_inst_d[25] & ~dtu_inst_d[26] | |
---|
| 1247 | dtu_inst_d[28]) | // b28 has to be 0 |
---|
| 1248 | ~op2[2] & ~op2[1] & op2[0] & // bpcc |
---|
| 1249 | dtu_inst_d[20]) | |
---|
| 1250 | arith_inst & (op3_hi[1] & (op3_lo[9] | op3_lo[13]) | |
---|
| 1251 | op3_hi[3] & (op3_lo[15] | // null |
---|
| 1252 | op3_lo[7]) | // impdep2 |
---|
| 1253 | op3_hi[3] & op3_lo[14] & |
---|
| 1254 | (~fcn0 | fcl_dtu_tlzero_d | |
---|
| 1255 | rs2_nonzero_d | inst12_5_nonzero_d | |
---|
| 1256 | dtu_inst_d[13] | ~rs1_00) | // done/retr |
---|
| 1257 | op3_hi[2] & op3_lo[12] & // movcc |
---|
| 1258 | dtu_inst_d[18] & dtu_inst_d[11] | |
---|
| 1259 | op3_hi[2] & op3_lo[15] & // movr |
---|
| 1260 | ~dtu_inst_d[11] & ~dtu_inst_d[10] | |
---|
| 1261 | op3_hi[2] & op3_lo[14] | // popc |
---|
| 1262 | op3_hi[2] & op3_lo[9] & //rdhpr |
---|
| 1263 | (~valid_hp_rs_d | rs1_01 & fcl_dtu_tlzero_d) | |
---|
| 1264 | op3_hi[2] & op3_lo[10] & // rdpr |
---|
| 1265 | (rs1[4] & ~rs1_10 | // not gl |
---|
| 1266 | rs1_0f | |
---|
| 1267 | ~rs1[4] & ~rs1[3] & ~rs1[2] & fcl_dtu_tlzero_d) | |
---|
| 1268 | op3_hi[2] & op3_lo[8] & |
---|
| 1269 | (rs1_0f & (~rd_00 | |
---|
| 1270 | dtu_inst_d[12] | |
---|
| 1271 | dtu_inst_d[7] | |
---|
| 1272 | inst11_8_nonzero_d)) | // mem# |
---|
| 1273 | op3_hi[3] & op3_lo[1] & |
---|
| 1274 | (~fcn0 | ~rs1_00 | rs2_nonzero_d | |
---|
| 1275 | inst12_5_nonzero_d | |
---|
| 1276 | dtu_inst_d[13]) | // savd, restd |
---|
| 1277 | op3_hi[3] & op3_lo[10] & |
---|
| 1278 | (inst11_8_nonzero_d | |
---|
| 1279 | dtu_inst_d[7] & |
---|
| 1280 | ~(fcl_dtu_privmode_d | |
---|
| 1281 | fcl_dtu_hprivmode_d) | |
---|
| 1282 | dtu_inst_d[29] | |
---|
| 1283 | ~dtu_inst_d[13] & (dtu_inst_d[6] | |
---|
| 1284 | dtu_inst_d[5])) |// tcc |
---|
| 1285 | op3_hi[3] & op3_lo[3] & // wrhpr |
---|
| 1286 | (~valid_hp_rd_d | rd_01 & fcl_dtu_tlzero_d) | |
---|
| 1287 | op3_hi[3] & op3_lo[2] & // wrpr |
---|
| 1288 | (rd[4] & ~rd_10 | rd_0f | // gl=0x10 |
---|
| 1289 | ~rd[4] & ~rd[3] & ~rd[2] & fcl_dtu_tlzero_d) | |
---|
| 1290 | op3_hi[3] & op3_lo[0] & |
---|
| 1291 | (rd_0f & ~(rs1_00 & dtu_inst_d[13])) // sir |
---|
| 1292 | ) | |
---|
| 1293 | mem_inst & (~op3[5] & op3_lo[12] | |
---|
| 1294 | op3[5] & (op3_lo[2] | op3_lo[6]) | // stqf, ldqf |
---|
| 1295 | op3[5] & op3[3] & ~op3[2] | |
---|
| 1296 | op3_hi[2] & (op3_lo[12] | |
---|
| 1297 | op3_lo[14] | op3_lo[15]) | |
---|
| 1298 | op3_hi[3] & (op3_lo[1] | op3_lo[5] | |
---|
| 1299 | op3_lo[15]) | // null |
---|
| 1300 | ~op3[5] & op3_lo[3] & rd[0] | // ldd w/ odd rd |
---|
| 1301 | op3[5] & op3_lo[1] & ~fcn0 | // ldfsr |
---|
| 1302 | op3[5] & op3_lo[13] & // prefetch |
---|
| 1303 | illegal_prefetch | |
---|
| 1304 | op3[5] & op3_lo[5] & ~fcn0 | // stfsr |
---|
| 1305 | ~op3[5] & op3_lo[7] & rd[0]) | // std w/ odd rd |
---|
| 1306 | inv_reg_access_d | |
---|
| 1307 | rsvchk_fail_d); |
---|
| 1308 | |
---|
| 1309 | dff_s #(1) illinste_ff(.din (ill_inst_d), |
---|
| 1310 | .q (ill_inst_e), |
---|
| 1311 | .clk (clk), .se(se), .si(), .so()); |
---|
| 1312 | assign dtu_fcl_illinst_e = (ill_inst_e | |
---|
| 1313 | // imask_hit_e | |
---|
| 1314 | hprivop_e); |
---|
| 1315 | |
---|
| 1316 | |
---|
| 1317 | //------------- |
---|
| 1318 | // LSU Controls |
---|
| 1319 | //------------- |
---|
| 1320 | // prefetch |
---|
| 1321 | assign prefetch = op3_lo[13] & op3[5]; |
---|
| 1322 | |
---|
| 1323 | assign impl_prefetch = ~rd[4] & ~rd[3] & ~rd[2] | // 0-3 |
---|
| 1324 | rd[4] & ~rd[3]; // 10-17 (hex) |
---|
| 1325 | assign noop_prefetch = rd_04 | rd[4] & rd[3]; // 4, 18-1f |
---|
| 1326 | |
---|
| 1327 | assign illegal_prefetch = ~rd[4] & rd[2] & (rd[1] | rd[0]) | // 5-7 |
---|
| 1328 | ~rd[4] & rd[3]; // 8-f |
---|
| 1329 | |
---|
| 1330 | assign prefetch_d = mem_inst & prefetch & impl_prefetch & |
---|
| 1331 | fcl_dtu_inst_vld_d; |
---|
| 1332 | assign pref_done_d = mem_inst & prefetch & noop_prefetch; |
---|
| 1333 | |
---|
| 1334 | assign dec_swl_ll_done_d = (pref_done_d | rdsr_done_d | rdpr_done_d | |
---|
| 1335 | save_retn_done_d); |
---|
| 1336 | |
---|
| 1337 | // alt space |
---|
| 1338 | assign lstype_d[2] = mem_inst & op3[4] & fcl_dtu_inst_vld_d; |
---|
| 1339 | // store |
---|
| 1340 | assign lstype_d[1] = mem_inst & op3[2] & ~prefetch & fcl_dtu_inst_vld_d & |
---|
| 1341 | ~quad_ffuop_d; |
---|
| 1342 | // load |
---|
| 1343 | assign lstype_d[0] = mem_inst & ~prefetch & fcl_dtu_inst_vld_d & |
---|
| 1344 | (~op3[2] | op3[3]) & (~op3_lo[14] | op3[5]) & |
---|
| 1345 | ~quad_ffuop_d; |
---|
| 1346 | |
---|
| 1347 | |
---|
| 1348 | // only the stda instruction needs to be flagged |
---|
| 1349 | assign dec_swl_std_inst_d = mem_inst & op3_hi[1] & op3_lo[7] & |
---|
| 1350 | fcl_dtu_inst_vld_d; |
---|
| 1351 | |
---|
| 1352 | assign sext_d = op3[3] & ~op3[2]; // load sign extension |
---|
| 1353 | assign ldstub_d = mem_inst & ~op3[5] & op3_lo[13] & fcl_dtu_inst_vld_d; |
---|
| 1354 | assign casa_d = mem_inst & op3[5] & (op3_lo[12] | op3_lo[14]) & |
---|
| 1355 | fcl_dtu_inst_vld_d; |
---|
| 1356 | assign swap_d = mem_inst & op3_lo[15] & fcl_dtu_inst_vld_d; |
---|
| 1357 | |
---|
| 1358 | // load inst for speculation |
---|
| 1359 | // fp loads are not speculated on |
---|
| 1360 | // ldd is not speculated on |
---|
| 1361 | assign dec_swl_ld_inst_d = mem_inst & ~op3[2] & |
---|
| 1362 | ~op3[5] & ~op3_lo[3]; |
---|
| 1363 | |
---|
| 1364 | // store, atomic or flush inst for stb flow control |
---|
| 1365 | // TBD: no need to full decode this if timing is a problem |
---|
| 1366 | assign dec_swl_st_inst_d = mem_inst & op3[2] | // st, pref, cas, ldstb |
---|
| 1367 | arith_inst & op3_hi[3] & op3_lo[11]; // flsh |
---|
| 1368 | |
---|
| 1369 | // size(out) 00-b 01-h 10-w 11-x/q/d |
---|
| 1370 | assign lssize_d[0] = (op3[1] & ~op3_lo[15]) | // stx,ld/sth,ld/stq, |
---|
| 1371 | // ldx, ldd, std, ~swap |
---|
| 1372 | op3[5] & (op3_lo[1] | op3_lo[5]) & rd[0]; // ldxfsr |
---|
| 1373 | |
---|
| 1374 | |
---|
| 1375 | assign lssize_d[1] = ~(op3[1]^op3[0]) | // ~ld/st b,h |
---|
| 1376 | (op3[5] & op3_lo[2]) | // ld/stq |
---|
| 1377 | op3_lo[14] | // stx, casx |
---|
| 1378 | op3_hi[2] & (op3_lo[1] | op3_lo[5]); // ldst fsr |
---|
| 1379 | |
---|
| 1380 | assign ifu_ffu_ldst_size_d = ~(op3[1] & op3[0]); // ldf, stf |
---|
| 1381 | // assign ifu_ffu_ldst_size_d[1] = op3[1] & op3[0]; // lddf, stdf |
---|
| 1382 | |
---|
| 1383 | |
---|
| 1384 | assign ldst_fp_d = op3[5] & ~op3[3] & fcl_dtu_inst_vld_d & |
---|
| 1385 | ~swl_dec_fpbusy_e; |
---|
| 1386 | |
---|
| 1387 | assign ldst_dbl_d = (~op3[3] & op3[1] & op3[0] | // ldd(f), std(f) |
---|
| 1388 | op3[5] & (op3_lo[2] | op3_lo[6])) & // ldq, stq |
---|
| 1389 | fcl_dtu_inst_vld_d; |
---|
| 1390 | |
---|
| 1391 | // mem bar |
---|
| 1392 | assign mb_mask_d = dtu_inst_d[1] | // #storeload |
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| 1393 | dtu_inst_d[5] | // #memissue |
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| 1394 | dtu_inst_d[6]; // #sync |
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| 1395 | |
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| 1396 | assign mb_inst_d = arith_inst & op3_hi[2] & op3_lo[8] & |
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| 1397 | rs1_0f & rd_00 & fcl_dtu_inst_vld_d & |
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| 1398 | dtu_inst_d[13] & mb_mask_d; |
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| 1399 | |
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| 1400 | |
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| 1401 | dff_s #(3) lstype_reg(.din (lstype_d), |
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| 1402 | .clk (clk), |
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| 1403 | .q (lstype_e), |
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| 1404 | .se (se), .si(), .so()); |
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| 1405 | dff_s #(2) lssize_reg(.din (lssize_d), |
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| 1406 | .clk (clk), |
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| 1407 | .q (ifu_lsu_ldst_size_e), |
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| 1408 | .se (se), .si(), .so()); |
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| 1409 | dff_s #(1) lsfp_reg(.din (ldst_fp_d), |
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| 1410 | .clk (clk), |
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| 1411 | .q (ifu_lsu_ldst_fp_e), |
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| 1412 | .se (se), .si(), .so()); |
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| 1413 | dff_s #(1) lsdbl_reg(.din (ldst_dbl_d), |
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| 1414 | .clk (clk), |
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| 1415 | .q (ifu_lsu_ldst_dbl_e), |
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| 1416 | .se (se), .si(), .so()); |
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| 1417 | |
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| 1418 | dff_s #(1) sext_reg(.din(sext_d), |
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| 1419 | .clk(clk), |
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| 1420 | .q(ifu_lsu_sign_ext_e), |
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| 1421 | .se(se), .si(), .so()); |
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| 1422 | dff_s #(1) casa_reg(.din(casa_d), |
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| 1423 | .clk(clk), |
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| 1424 | .q(casa_e), |
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| 1425 | .se(se), .si(), .so()); |
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| 1426 | dff_s #(1) ldstub_reg(.din(ldstub_d), |
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| 1427 | .clk(clk), |
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| 1428 | .q(ifu_lsu_ldstub_e), |
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| 1429 | .se(se), .si(), .so()); |
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| 1430 | dff_s #(1) swap_reg(.din(swap_d), |
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| 1431 | .clk(clk), |
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| 1432 | .q(ifu_lsu_swap_e), |
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| 1433 | .se(se), .si(), .so()); |
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| 1434 | |
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| 1435 | dff_s #(1) pfe_ff(.din (prefetch_d), |
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| 1436 | .q (prefetch_e), |
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| 1437 | .clk (clk), .se(se), .si(), .so()); |
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| 1438 | |
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| 1439 | dff_s #(1) mb_ff(.din (mb_inst_d), |
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| 1440 | .q (mb_inst_e), |
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| 1441 | .clk (clk), |
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| 1442 | .se(se), .si(), .so()); |
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| 1443 | |
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| 1444 | assign ifu_lsu_casa_e = casa_e; |
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| 1445 | assign ifu_exu_casa_d = casa_d; |
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| 1446 | |
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| 1447 | // assign ifu_lsu_ld_inst_e = lstype_e[0] & (~dtu_inst_anull_e) & |
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| 1448 | // ~ifu_ffu_quad_op_e & fcl_dtu_inst_vld_e; |
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| 1449 | // assign ifu_lsu_st_inst_e = lstype_e[1] & (~dtu_inst_anull_e) & |
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| 1450 | // ~ifu_ffu_quad_op_e & fcl_dtu_inst_vld_e; |
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| 1451 | |
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| 1452 | assign ifu_lsu_ld_inst_e = lstype_e[0]; |
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| 1453 | assign ifu_lsu_st_inst_e = lstype_e[1]; |
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| 1454 | |
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| 1455 | // temporary |
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| 1456 | // assign ifu_lsu_alt_space_e = lstype_e[2] & ~dtu_inst_anull_e & |
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| 1457 | // fcl_dtu_inst_vld_e; |
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| 1458 | |
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| 1459 | assign ifu_lsu_alt_space_e = lstype_e[2]; |
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| 1460 | assign ifu_lsu_alt_space_d = mem_inst & op3[4] & fcl_dtu_inst_vld_d; |
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| 1461 | assign ifu_tlu_alt_space_d = op3[4] & fcl_dtu_ely_inst_vld_d; |
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| 1462 | // assign ifu_lsu_imm_asi_vld_d = op3[4] & ~dtu_inst_d[13]; |
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| 1463 | assign ifu_lsu_memref_d = mem_inst & fcl_dtu_ely_inst_vld_d; |
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| 1464 | |
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| 1465 | assign ifu_tlu_mb_inst_e = mb_inst_e & ~dtu_inst_anull_e & |
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| 1466 | fcl_dtu_inst_vld_e; |
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| 1467 | |
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| 1468 | assign ifu_lsu_pref_inst_e = fcl_dtu_inst_vld_e & prefetch_e & |
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| 1469 | ~dtu_inst_anull_e; |
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| 1470 | |
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| 1471 | //------------ |
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| 1472 | // IMASK |
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| 1473 | //------------ |
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| 1474 | assign rs2_hit = (dtu_inst_d[4:0] == erb_dtu_imask[4:0]); |
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| 1475 | assign opf_hit = (dtu_inst_d[12:5] == erb_dtu_imask[12:5]); |
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| 1476 | assign ibit_hit = (dtu_inst_d[13] == erb_dtu_imask[13]); |
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| 1477 | assign rs1_hit = (dtu_inst_d[18:14] == erb_dtu_imask[18:14]); |
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| 1478 | assign op3_hit = (dtu_inst_d[24:19] == erb_dtu_imask[24:19]); |
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| 1479 | assign rd_hit = (dtu_inst_d[29:25] == erb_dtu_imask[29:25]); |
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| 1480 | assign op_hit = (dtu_inst_d[31:30] == erb_dtu_imask[31:30]); |
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| 1481 | |
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| 1482 | assign imask_hit = (rs2_hit | ~erb_dtu_imask[32]) & |
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| 1483 | (opf_hit | ~erb_dtu_imask[33]) & |
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| 1484 | (ibit_hit | ~erb_dtu_imask[34]) & |
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| 1485 | (rs1_hit | ~erb_dtu_imask[35]) & |
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| 1486 | (op3_hit | ~erb_dtu_imask[36]) & |
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| 1487 | (rd_hit | ~erb_dtu_imask[37]) & |
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| 1488 | (op_hit | ~erb_dtu_imask[38]) & |
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| 1489 | (|erb_dtu_imask[38:32]) & |
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| 1490 | fcl_dtu_inst_vld_d; |
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| 1491 | |
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| 1492 | dff_s #(1) imsk_ff(.din (imask_hit), |
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| 1493 | .q (imask_hit_e), |
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| 1494 | .clk (clk), .se(se), .si(), .so()); |
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| 1495 | assign dtu_fcl_imask_hit_e = imask_hit_e & swl_dec_ibe_e; |
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| 1496 | |
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| 1497 | |
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| 1498 | //------------- |
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| 1499 | // SPU Controls |
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| 1500 | //------------- |
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| 1501 | |
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| 1502 | // assign scpy_inst_d = arith_inst & op3_hi[3] & op3_lo[7] & // use impdep 2 |
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| 1503 | // ~dtu_inst_d[13] & dtu_inst_d[12]; // i=0 always |
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| 1504 | // assign scmp_inst_d = arith_inst & op3_hi[3] & op3_lo[7] & |
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| 1505 | // ~dtu_inst_d[13] & ~dtu_inst_d[12]; |
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| 1506 | // |
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| 1507 | // dff #(1) scpy_ff (.din (scpy_inst_d), |
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| 1508 | // .clk (clk), |
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| 1509 | // .q (scpy_inst_e), |
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| 1510 | // .se (se), .si(), .so()); |
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| 1511 | // |
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| 1512 | // assign ifu_spu_scpy_inst_e = scpy_inst_e & ~dtu_inst_anull_e & |
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| 1513 | // fcl_dtu_inst_vld_e; |
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| 1514 | // |
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| 1515 | // dff #(1) scmp_ff (.din (scmp_inst_d), |
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| 1516 | // .q (scmp_inst_e), |
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| 1517 | // .clk (clk), .se (se), .si(), .so()); |
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| 1518 | // |
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| 1519 | // assign ifu_spu_scmp_inst_e = scmp_inst_e & ~dtu_inst_anull_e & |
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| 1520 | // fcl_dtu_inst_vld_e; |
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| 1521 | // |
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| 1522 | // |
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| 1523 | |
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| 1524 | endmodule // sparc_ifu_dec |
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| 1525 | |
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| 1526 | // Local Variables: |
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| 1527 | // verilog-library-directories:("../rtl" ".") |
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| 1528 | // End: |
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