decode_types.vhdl

   1 library ieee;
   2 use ieee.std_logic_1164.all;
   3
   4 package decode_types is
   5         type insn_type_t is (OP_ILLEGAL, OP_NOP, OP_ADD, OP_ADDE, OP_ADDEX, OP_ADDME,
   6                 OP_ADDPCIS, OP_AND, OP_ANDC, OP_ATTN, OP_B, OP_BC, OP_BCREG,
   7                 OP_BPERM, OP_CMP, OP_CMPB, OP_CMPEQB, OP_CMPL, OP_CMPRB,
   8                 OP_CNTLZD, OP_CNTLZW, OP_CNTTZD, OP_CNTTZW, OP_CRAND,
   9                 OP_CRANDC, OP_CREQV, OP_CRNAND, OP_CRNOR, OP_CROR, OP_CRORC,
  10                 OP_CRXOR, OP_DARN, OP_DCBF, OP_DCBST, OP_DCBT, OP_DCBTST,
  11                 OP_DCBZ, OP_DIV, OP_EQV, OP_EXTSB, OP_EXTSH,
  12                 OP_EXTSW, OP_EXTSWSLI, OP_ICBI, OP_ICBT, OP_ISEL, OP_ISYNC,
  13                 OP_LOAD, OP_STORE, OP_MADDHD, OP_MADDHDU, OP_MADDLD, OP_MCRF,
  14                 OP_MCRXR, OP_MCRXRX, OP_MFCR, OP_MFSPR, OP_MOD,
  15                 OP_MTCRF, OP_MTSPR, OP_MUL_L64,
  16                 OP_MUL_H64, OP_MUL_H32, OP_NAND, OP_NEG, OP_NOR, OP_OR,
  17                 OP_ORC, OP_POPCNTB, OP_POPCNTD, OP_POPCNTW, OP_PRTYD,
  18                 OP_PRTYW, OP_RLDCX, OP_RLDIC, OP_RLDICL, OP_RLDICR,
  19                 OP_RLDIMI, OP_RLWIMI, OP_RLWINM, OP_RLWNM, OP_SETB, OP_SLD,
  20                 OP_SLW, OP_SRAD, OP_SRADI, OP_SRAW, OP_SRAWI, OP_SRD, OP_SRW,
  21                 OP_SUBF, OP_SUBFE, OP_SUBFME, OP_SYNC, OP_TD, OP_TDI, OP_TW,
  22                 OP_TWI, OP_XOR, OP_SIM_CONFIG);
  23
  24         type input_reg_a_t is (NONE, RA, RA_OR_ZERO, RS);
  25         type input_reg_b_t is (NONE, RB, RS, CONST_UI, CONST_SI, CONST_SI_HI, CONST_UI_HI, CONST_LI, CONST_BD, CONST_DS);
  26         type input_reg_c_t is (NONE, RS);
  27         type output_reg_a_t is (NONE, RT, RA);
  28         type rc_t is (NONE, ONE, RC);
  29
  30         constant SH_OFFSET : integer := 0;
  31         constant MB_OFFSET : integer := 1;
  32         constant ME_OFFSET : integer := 1;
  33         constant SH32_OFFSET : integer := 0;
  34         constant MB32_OFFSET : integer := 1;
  35         constant ME32_OFFSET : integer := 2;
  36
  37         constant FXM_OFFSET : integer := 0;
  38
  39         constant BO_OFFSET : integer := 0;
  40         constant BI_OFFSET : integer := 1;
  41         constant BH_OFFSET : integer := 2;
  42
  43         constant BF_OFFSET : integer := 0;
  44         constant L_OFFSET  : integer := 1;
  45
  46         constant TOO_OFFSET : integer := 0;
  47
  48         type unit_t is (NONE, ALU, LDST, MUL, DIV);
  49         type length_t is (NONE, is1B, is2B, is4B, is8B);
  50
  51         type decode_rom_t is record
  52                 unit         : unit_t;
  53                 insn_type    : insn_type_t;
  54                 input_reg_a  : input_reg_a_t;
  55                 input_reg_b  : input_reg_b_t;
  56                 input_reg_c  : input_reg_c_t;
  57                 output_reg_a : output_reg_a_t;
  58
  59                 input_cr     : std_ulogic;
  60                 output_cr    : std_ulogic;
  61
  62                 input_carry  : std_ulogic;
  63                 output_carry : std_ulogic;
  64
  65                 -- load/store signals
  66                 length       : length_t;
  67                 byte_reverse : std_ulogic;
  68                 sign_extend  : std_ulogic;
  69                 update       : std_ulogic;
  70                 reserve      : std_ulogic;
  71
  72                 -- multiplier signals
  73                 mul_32bit     : std_ulogic;
  74                 mul_signed    : std_ulogic;
  75
  76                 rc           : rc_t;
  77                 lr           : std_ulogic;
  78
  79                 sgl_pipe     : std_ulogic;
  80         end record;
  81         constant decode_rom_init : decode_rom_t := (unit => NONE,
  82                 insn_type => OP_ILLEGAL, input_reg_a => NONE,
  83                 input_reg_b => NONE, input_reg_c => NONE,
  84                 output_reg_a => NONE, input_cr => '0', output_cr => '0',
  85                 input_carry => '0', output_carry => '0',
  86                 length => NONE, byte_reverse => '0', sign_extend => '0',
  87                 update => '0', reserve => '0', mul_32bit => '0',
  88                 mul_signed => '0', rc => NONE, lr => '0', sgl_pipe => '0');
  89
  90 end decode_types;
  91
  92 package body decode_types is
  93 end decode_types;