| | 1 | # Assemble with gas |
| | 2 | # --register-prefix-optional --bitwise-or |
| | 3 | |
| | 4 | .macro ldarg arg, stacksz, reg |
| | 5 | move.l (4 + \arg * 4 + \stacksz)(%sp), \reg |
| | 6 | .endm |
| | 7 | |
| | 8 | |
| | 9 | .global read_joy_responses /* u8 *rbuf */ |
| | 10 | read_joy_responses: |
| | 11 | ldarg 0, 0, a1 |
| | 12 | movem.l d2-d7, -(sp) |
| | 13 | movea.l #0xa10003, a0 |
| | 14 | move.b #0x40, (6,a0) |
| | 15 | move.b #0x40, (a0) |
| | 16 | |
| | 17 | .macro one_test val |
| | 18 | move.l #100/12-1, d0 |
| | 19 | 0: |
| | 20 | dbra d0, 0b |
| | 21 | move.b \val, d0 |
| | 22 | move.b d0, (a0) |
| | 23 | move.b (a0), d0 |
| | 24 | move.b (a0), d1 |
| | 25 | move.b (a0), d2 |
| | 26 | move.b (a0), d3 |
| | 27 | move.b (a0), d4 |
| | 28 | move.b (a0), d5 |
| | 29 | move.b (a0), d6 |
| | 30 | move.b (a0), d7 |
| | 31 | move.b d0, (a1)+ |
| | 32 | move.b d1, (a1)+ |
| | 33 | move.b d2, (a1)+ |
| | 34 | move.b d3, (a1)+ |
| | 35 | move.b d4, (a1)+ |
| | 36 | move.b d5, (a1)+ |
| | 37 | move.b d6, (a1)+ |
| | 38 | move.b d7, (a1)+ |
| | 39 | .endm |
| | 40 | |
| | 41 | move.w #0x2700, sr |
| | 42 | one_test #0x00 |
| | 43 | one_test #0x40 |
| | 44 | one_test #0x00 |
| | 45 | one_test #0x40 |
| | 46 | one_test #0x00 |
| | 47 | move.w #0x2000, sr |
| | 48 | movem.l (sp)+, d2-d7 |
| | 49 | rts |
| | 50 | |
| | 51 | |
| | 52 | .global run_game /* u16 mapper, int tas_sync */ |
| | 53 | run_game: |
| | 54 | move.w #0x2700, sr |
| | 55 | ldarg 0, 0, d7 |
| | 56 | ldarg 1, 0, d6 |
| | 57 | move.l #0xa10000, a6 |
| | 58 | move.l #0xc00000, a5 |
| | 59 | move.l #0xc00005, a4 |
| | 60 | move.l #0xc00004, a3 |
| | 61 | moveq.l #0x00, d2 |
| | 62 | move.b #0xff, d3 |
| | 63 | move.b #0x40, d4 |
| | 64 | move.b d4, (0x09,a6) /* CtrlA */ |
| | 65 | move.b d2, (0x0b,a6) /* CtrlB */ |
| | 66 | move.b d2, (0x0d,a6) /* CtrlC */ |
| | 67 | move.b d2, (0x13,a6) /* S-CtrlA */ |
| | 68 | move.b d3, (0x0f,a6) /* TxDataA */ |
| | 69 | move.b d2, (0x19,a6) /* S-CtrlB */ |
| | 70 | move.b d3, (0x15,a6) /* TxDataB */ |
| | 71 | move.b d2, (0x1f,a6) /* S-CtrlC */ |
| | 72 | move.b d3, (0x1b,a6) /* TxDataC */ |
| | 73 | |
| | 74 | /* set up for vram write */ |
| | 75 | move.l #0x40000000, (a3) |
| | 76 | |
| | 77 | move.l #0xff0000, a1 |
| | 78 | move.l #0x10000/4/4-1, d0 |
| | 79 | 0: |
| | 80 | move.l d2, (a1)+ |
| | 81 | move.l d2, (a1)+ |
| | 82 | move.l d2, (a1)+ |
| | 83 | move.l d2, (a1)+ |
| | 84 | dbra d0, 0b |
| | 85 | |
| | 86 | move.l #0xfffe00, a1 |
| | 87 | tst.l d6 |
| | 88 | bne use_tas_code |
| | 89 | |
| | 90 | lea (run_game_r,pc), a0 |
| | 91 | move.l #(run_game_r_end - run_game_r)/2-1, d0 |
| | 92 | bra 0f |
| | 93 | use_tas_code: |
| | 94 | lea (run_game_r_tas,pc), a0 |
| | 95 | move.l #(run_game_r_tas_end - run_game_r_tas)/2-1, d0 |
| | 96 | |
| | 97 | 0: |
| | 98 | move.w (a0)+, (a1)+ |
| | 99 | dbra d0, 0b |
| | 100 | jmp 0xfffe00 |
| | 101 | |
| | 102 | run_game_r: |
| | 103 | move.w #0x3210, (0xA13006) |
| | 104 | |
| | 105 | move.w d7, (0xA13010) |
| | 106 | move.w #0, (0xA13000) |
| | 107 | |
| | 108 | move.l (0x00), a7 |
| | 109 | move.l (0x04), a0 |
| | 110 | jmp (a0) |
| | 111 | run_game_r_end: |
| | 112 | |
| | 113 | run_game_r_tas: |
| | 114 | move.w #0x3210, (0xA13006) |
| | 115 | move.w d7, (0xA13010) |
| | 116 | move.w #0, (0xA13000) |
| | 117 | |
| | 118 | move.l (0x00), a7 |
| | 119 | move.l (0x04), a0 |
| | 120 | |
| | 121 | 0: /* wait for special code */ |
| | 122 | move.b d4, (0x03,a6) |
| | 123 | move.b (0x03,a6), d0 |
| | 124 | move.b d2, (0x03,a6) |
| | 125 | move.b (0x03,a6), d1 |
| | 126 | and.b #0x3f, d0 |
| | 127 | cmp.b d0, d1 |
| | 128 | bne 0b |
| | 129 | cmp.b #0x25, d0 |
| | 130 | bne 0b |
| | 131 | |
| | 132 | 0: /* wait for special code to end */ |
| | 133 | cmp.b (0x03,a6), d0 |
| | 134 | beq 0b |
| | 135 | |
| | 136 | /* wait for active display */ |
| | 137 | moveq.l #3, d0 |
| | 138 | 0: |
| | 139 | btst d0, (a4) /* 8 */ |
| | 140 | beq.s 0b /* 10 */ |
| | 141 | 0: |
| | 142 | btst d0, (a4) |
| | 143 | bne.s 0b |
| | 144 | |
| | 145 | /* flood the VDP FIFO */ |
| | 146 | .rept 5 |
| | 147 | move.w d2, (a5) |
| | 148 | .endr |
| | 149 | |
| | 150 | /* doesn't help.. */ |
| | 151 | .if 0 |
| | 152 | .rept 94 |
| | 153 | nop |
| | 154 | .endr |
| | 155 | move.l #0x93049400, (a3) /* DMALEN LO/HI = 0x0008 */ |
| | 156 | move.l #0x95009601, (a3) /* DMA SRC LO/MID */ |
| | 157 | move.l #0x977f8114, (a3) /* DMA SRC HI/MODE, Turn off Display */ |
| | 158 | move.l #0xc0000080, (a3) /* start DMA */ |
| | 159 | .endif |
| | 160 | |
| | 161 | move.b d2, (0x09,a6) /* CtrlA */ |
| | 162 | move.b d4, (0x03,a6) |
| | 163 | jmp (a0) |
| | 164 | run_game_r_tas_end: |
| | 165 | |
| | 166 | # vim:filetype=asmM68k:ts=4:sw=4:expandtab |
notaz.gp2x.de / megadrive.git / blame_incremental