1 ###############################################################################
3 # Copyright (c) 2009,2011 GraÅžvydas Ignotas
6 # Redistribution and use in source and binary forms, with or without
7 # modification, are permitted provided that the following conditions are met:
8 # * Redistributions of source code must retain the above copyright
9 # notice, this list of conditions and the following disclaimer.
10 # * Redistributions in binary form must reproduce the above copyright
11 # notice, this list of conditions and the following disclaimer in the
12 # documentation and/or other materials provided with the distribution.
13 # * Neither the name of the organization nor the
14 # names of its contributors may be used to endorse or promote products
15 # derived from this software without specific prior written permission.
17 # THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND ANY
18 # EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 # DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY
21 # DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 # (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 # LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 # ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
26 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 # --register-prefix-optional --bitwise-or
34 .equ RELOCATE_TO_RAM, 1
42 ##################################################
44 # Register and bitmask definitions #
46 ##################################################
48 .equ GFXDATA, 0xc00000
49 .equ GFXCNTL, 0xc00004
52 .equ VDP0_E_DISPLAY, 0x02
53 .equ VDP0_PLTT_FULL, 0x04
55 .equ VDP1_SMS_MODE, 0x80
56 .equ VDP1_E_DISPLAY, 0x40
64 .equ VDP12_SCREEN_V224, 0x00
65 .equ VDP12_SCREEN_V448, 0x04
66 .equ VDP12_PROGRESSIVE, 0x00
67 .equ VDP12_INTERLACED, 0x02
68 .equ VDP12_SCREEN_H256, 0x00
69 .equ VDP12_SCREEN_H320, 0x81
71 .equ VDP16_MAP_V32, 0x00
72 .equ VDP16_MAP_V64, 0x10
73 .equ VDP16_MAP_V128, 0x30
74 .equ VDP16_MAP_H32, 0x00
75 .equ VDP16_MAP_H64, 0x01
76 .equ VDP16_MAP_H128, 0x03
79 .equ MMODE_VAL_INPUT, 1
80 .equ MMODE_EDIT_VAL, 2
82 .equ MMODE_START_MENU, 4
83 .equ MMODE_GOTO_PREDEF, 5
84 .equ MMODE_JMP_ADDR, 6
87 .equ predef_addr_cnt, ((predef_addrs_end-predef_addrs)/4)
89 ##################################################
93 ##################################################
96 # Write val to VDP register reg
97 .macro write_vdp_r_dst reg val dst
98 move.w #((\reg << 8) + 0x8000 + \val),\dst
101 # Write val to VDP register reg, vdp addr in a3
102 .macro write_vdp_reg reg val
103 write_vdp_r_dst \reg, \val, (a3)
106 # Set up address in VDP, control port in dst
107 .macro VRAM_ADDR adr dst
108 move.l #(0x40000000 | ((\adr & 0x3fff) << 16) | (\adr >> 14)),\dst
111 .macro VSRAM_ADDR adr dst
112 move.l #(0x40000010 | ((\adr & 0x3fff) << 16) | (\adr >> 14)),\dst
116 # make VDP word from address adr and store in d0
117 .macro XRAM_ADDR_var adr
127 .macro VRAM_ADDR_var adr
133 .macro CRAM_ADDR_var adr
139 # convert tile coords in d0, d1 to nametable addr to a0
148 # check if some d-pad button (and modifier) is pressed
149 .macro do_dpad bit op val
157 # convert a6 to normal addr
159 .macro mk_a6_addr reg
167 .macro change_mode mode_new mode_back
169 or.w #(\mode_back<<11)|(\mode_new<<8),d7
173 .macro menu_text str x y pal
177 move.l #0x8000|(\pal<<13),d2
181 #################################################
185 #################################################
188 dc.w 0x0000,0x0eee,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
189 dc.w 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
190 dc.w 0x0000,0x02e2,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
191 dc.w 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
192 dc.w 0x0000,0x0e44,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
193 dc.w 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
194 dc.w 0x0000,0x044e,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
195 dc.w 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
200 /* Y size link attr X */
201 dc.w 0; dc.b 0x05; dc.b 0; dc.w 0x6002; dc.w 0
205 dc.l 0x000000, 0x200000, 0x400000, 0xa00000, 0xa10000
206 dc.l 0xa11100, 0xa12000, 0xa13000, 0xa14000, 0xc00000
210 dc.l 0x000000, 0x7fffff
211 dc.l 0xe00000, 0xffffff
212 dc.l 0xa00000, 0xa100ff
213 dc.l 0xa11000, 0xa113ff
214 dc.l 0xa12000, 0xa120ff
215 dc.l 0xa13000, 0xa130ff
228 .ascii "Go to address\0"
230 .ascii "Go to (predef)\0"
232 .ascii "Jump to address\0"
234 .ascii "PC Transfer\0"
236 .ascii "DTACK safety\0"
238 .ascii "Transfer Ready\0"
242 .ascii "DTACK err?\0"
244 .ascii "Exception \0"
246 ##################################################
250 ##################################################
253 # a6 = page_start[31:8]|cursor_offs[7:0]
254 # d7 = old_inputs[31:16]|edit_bytes[15:14]|g_mode_old[13:11]|g_mode[10:8]|irq_cnt[7:0]
255 # d6 = edit_word_save[31:15]|edit_done[7]|no_dtack_detect[4]|autorep_cnt[3:0]
257 # edit: edit_word[31:8]|edit_pos[4:2]|byte_cnt[1:0]
263 /* make sure io port 2 is doing inputs */
264 move.b #0,(0xa1000b).l
265 /* make sure irqs are masked */
267 /* take care of TMSS */
268 move.b (0xa10000).l,d0
271 move.l #0x53454741,(0xa14000).l
272 /* want cart, not OS rom if cart pops in */
273 move.w #1,(0xa14100).l
274 /* touch VDP after TMSS setup? */
279 /* copy to expansion device if magic number is set */
285 move.l (sizeof_bin,pc),d0
295 /* we could be relocated by 32x or something else, adjust start addr */
301 /* copy, assume 8K size */
303 move.l (sizeof_bin,pc),d0
311 lea (test_code,pc),a0
313 move.w #(test_code_end - test_code)/2-1,d0
324 /* patch test code */
326 add.w #(test_code_ret_op-test_code+2),a1
338 move.b #0x40,(0xa10009).l
339 move.b #0x40,(0xa10003).l
344 /* Clear h/v scroll */
346 VRAM_ADDR 0x8000,(GFXCNTL)
348 VSRAM_ADDR 0,(GFXCNTL)
351 /* Load color data */
354 moveq.l #(colors_end-colors)/2,d0
357 /* load font patterns */
360 VRAM_ADDR 0,(GFXCNTL)
372 rol.l #1,d1 /* fixup */
376 /* generate A layer map */
384 0: move.l #0x00000000,(a0)
390 /* generate B layer map */
395 0: move.l #0x00000000,(a0)
398 /* upload sprite data */
401 lea (sprite_data,pc),a1
403 move.l #(sprite_data_end-sprite_data)/2-1,d3
408 /* wait for vsync before unmask */
411 /* wait a bit to avoid nested vint */
414 dbra d0,0b /* 10 cycles to go back */
416 /* enable and unmask vint */
417 write_vdp_r_dst 1,(VDP1_E_VBI | VDP1_E_DISPLAY | VDP1_MODE5),(GFXCNTL)
421 ##################################################
434 /* let's hope VRAM is already set up.. */
442 ##################################################
446 # movem.l d0-d4/a0-a5,-(a7)
448 btst.b #5,(0xa10005).l
450 change_mode MMODE_PC, MMODE_MAIN
451 write_vdp_r_dst 12,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320 | VDP12_STE),(GFXCNTL)
458 lea (jumptab,pc,d0),a0
461 /* branch insns here because we want to be position independent */
464 bra mode_edit_val /* edit val in editor */
471 ##################### main #######################
474 /* assume we will hang */
475 lea (txt_dtack_err,pc),a0
485 move.l d0,a1 /* current addr */
488 add.b #27-1,d1 /* line where the cursor sits */
492 move.l #27-1,d5 /* line counter for dbra */
515 # unsafe or partially safe
518 swap d4 /* mask in upper word */
520 bne draw_row_hsafe_words_pre
522 draw_row_hsafe_bytes_pre:
527 draw_row_hsafe_bytes:
533 move.l #'?'|('?'<<16),(a0)
535 move.l #'?'|('?'<<16),(a0)
545 dbra d4,draw_row_hsafe_bytes
552 beq draw_cursor_unsafe_byte
553 bra draw_chars_hsafe_pre
555 draw_row_hsafe_words_pre:
560 draw_row_hsafe_words:
566 move.l #'?'|('?'<<16),(a0)
567 move.l #'?'|('?'<<16),(a0)
574 dbra d4,draw_row_hsafe_words
576 move.l #(' '<<16)|' ',(a0)
581 beq draw_cursor_unsafe_word
583 draw_chars_hsafe_pre:
593 move.l #'?'|('?'<<16),(a0)
594 bra draw_chars_hsafe_next
596 btst.l #15,d7 /* must perform correct read type */
597 bne 0f /* doing byte reads on security reg hangs */
624 draw_chars_hsafe_next:
626 dbra d4,draw_chars_hsafe
628 move.l #(' '<<16)|' ',(a0)
667 move.l #(' '<<16)|' ',(a0)
689 move.l #(' '<<16)|' ',(a0)
711 move.l #' '|(' '<<16),(a0)
712 move.l #' '|(' '<<16),(a0)
717 jsr get_input /* x0cbrldu x1sa00du */
719 btst.l #16+4,d0 /* A - scroll modifier */
722 do_dpad 16+0, sub, #0x0800
723 do_dpad 16+1, add, #0x0800
724 do_dpad 16+10, sub, #0xd800
725 do_dpad 16+11, add, #0xd800
732 do_dpad 0, subq, #0x0008
733 do_dpad 1, addq, #0x0008
754 btst.l #12,d0 /* B - switch byte/word mode */
757 add.w #0x4000,d7 /* changes between 01 10 */
760 sub.l d1,a6 /* make even, just in case */
763 btst.l #13,d0 /* C - edit selected byte */
766 change_mode MMODE_EDIT_VAL, MMODE_MAIN
767 write_vdp_r_dst 12,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320 | VDP12_STE),(GFXCNTL)
770 btst.l #5,d0 /* Start - menu */
774 change_mode MMODE_START_MENU, MMODE_MAIN
775 write_vdp_r_dst 12,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320 | VDP12_STE),(GFXCNTL)
779 # movem.l (a7)+,d0-d4/a0-a5
787 draw_cursor_unsafe_byte:
789 and.l #7,d0 /* byte offs */
792 add.b d1,d0 /* d0 *= 3 (chars) */
796 move.l #(0x2000|'?'|((0x2000|'?')<<16)),(a0)
800 jsr load_prepare /* restore a0 */
801 bra draw_chars_hsafe_pre
803 draw_cursor_unsafe_word:
805 and.l #7,d0 /* byte offs */
807 lsr.b #1,d1 /* which word */
810 add.b d2,d1 /* num of chars to skip */
815 move.l #(0x2000|'?'|((0x2000|'?')<<16)),d0
821 jsr load_prepare /* restore a0 */
822 bra draw_chars_hsafe_pre
827 and.l #7,d0 /* byte offs */
833 add.b d1,d0 /* d0 *= 3 (chars) */
841 jsr load_prepare /* restore a0 */
847 and.l #7,d0 /* byte offs */
849 lsr.b #1,d1 /* which word */
852 add.b d2,d1 /* num of chars to skip */
863 jsr load_prepare /* restore a0 */
868 #################### hedit #######################
872 bne mode_hedit_finish
874 /* read val to edit */
890 change_mode MMODE_VAL_INPUT, MMODE_EDIT_VAL
909 ##################### goto #######################
920 or.b #3,d5 /* 3 bytes */
922 change_mode MMODE_VAL_INPUT, MMODE_GOTO
942 ################### val edit #####################
946 movea.l #0xe000+14*2+11*64*2,a1
966 lea (txt_a_confirm,pc),a0
977 and.b #3,d3 /* edit field bytes */
995 lsr.b #1,d1 /* length in bytes */
999 and.b #7,d1 /* nibble to edit */
1003 sub.b #1,d3 /* chars to shift out */
1014 jsr get_input /* x0cbrldu x1sa00du */
1021 add.b d1,d1 /* nibble count */
1022 sub.b #1,d1 /* max n.t.e. val */
1025 and.b #7,d2 /* nibble to edit */
1037 lsl.l d1,d3 /* mask */
1038 lsl.l d1,d4 /* what to add/sub */
1049 eor.l #0xffffffff,d3
1083 btst.l #4,d0 /* A - confirm */
1086 move.w d7,d1 /* back to prev mode */
1096 ################### start menu ###################
1103 menu_text txt_about, 13, 9, 1
1104 menu_text txt_goto, 13, 11, 0
1105 menu_text txt_goto_predef, 13, 12, 0
1106 menu_text txt_jmp_addr, 13, 13, 0
1107 menu_text txt_dump, 13, 14, 0
1108 menu_text txt_dtack, 13, 15, 0
1109 menu_text txt_a_confirm, 13, 17, 2
1111 /* dtack safety on/off */
1112 movea.l #0xe000+26*2+15*64*2,a0
1114 move.w #0x8000|'O',(a0)
1117 move.w #0x8000|'N',(a0)
1120 move.w #0x8000|'F',(a0)
1121 move.w #0x8000|'F',(a0)
1125 movea.l #0xe000+11*2+11*64*2,a0
1135 jsr get_input /* x0cbrldu x1sa00du */
1144 or.b #1,d2 /* up -1, down 1 */
1159 btst.l #4,d0 /* A - confirm */
1164 change_mode MMODE_GOTO, MMODE_MAIN
1171 change_mode MMODE_GOTO_PREDEF, MMODE_MAIN
1177 change_mode MMODE_JMP_ADDR, MMODE_MAIN
1183 change_mode MMODE_PC, MMODE_MAIN
1203 movea.l #0xe000+10*2+8*64*2,a1
1217 ################### goto predef ##################
1221 movea.l #0xe000+14*2+8*64*2,a1
1222 move.l #predef_addr_cnt+2-1,d1
1234 /* draw addresses */
1235 movea.l #0xe000+17*2+9*64*2,a1
1236 lea (predef_addrs,pc),a2
1237 move.w #predef_addr_cnt-1,d4
1243 jsr print_hex_preped
1248 movea.l #0xe000+15*2+9*64*2,a0
1257 jsr get_input /* x0cbrldu x1sa00du */
1264 or.b #1,d2 /* up -1, down 1 */
1268 move.b #predef_addr_cnt-1,d5
1270 cmp.b #predef_addr_cnt-1,d5
1277 btst.l #4,d0 /* A - confirm */
1282 lea (predef_addrs,pc),a0
1285 bra mode_goto_finish
1296 ##################### jmp ########################
1303 or.b #3,d5 /* 3 bytes */
1305 change_mode MMODE_VAL_INPUT, MMODE_JMP_ADDR
1310 write_vdp_r_dst 1,(VDP1_E_DISPLAY | VDP1_MODE5),(GFXCNTL) /* disable vint */
1315 move.b #0x40,(0xa1000b).l /* port 2 ctrl */
1316 move.b #0x00,(0xa10005).l /* port 2 data - start with TH low */
1318 lea (txt_transfer_ready,pc),a0
1325 move.b (0xa10005),d0
1329 menu_text txt_working, 13, 13, 0
1332 # go back to main mode
1334 bclr.l #7,d6 /* not edited */
1335 change_mode MMODE_MAIN, MMODE_MAIN
1336 write_vdp_r_dst 12,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320),(GFXCNTL)
1340 #################################################
1342 # Initialize VDP registers #
1344 #################################################
1348 write_vdp_reg 0,(VDP0_E_DISPLAY | VDP0_PLTT_FULL)
1349 write_vdp_reg 1,(VDP1_E_DISPLAY | VDP1_MODE5)
1350 write_vdp_reg 2,(0xe000 >> 10) /* Screen map a adress */
1351 write_vdp_reg 3,(0xe000 >> 10) /* Window address */
1352 write_vdp_reg 4,(0xc000 >> 13) /* Screen map b address */
1353 write_vdp_reg 5,(0xfc00 >> 9) /* Sprite address */
1355 write_vdp_reg 7,0 /* Backdrop color */
1356 write_vdp_reg 0x0a,1 /* Lines per hblank interrupt */
1357 write_vdp_reg 0x0b,0 /* 2-cell vertical scrolling */
1358 write_vdp_reg 0x0c,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320)
1359 write_vdp_reg 0x0d,(0x8000 >> 10) /* Horizontal scroll address */
1360 write_vdp_reg 0x0e,0
1361 write_vdp_reg 0x0f,2
1362 write_vdp_reg 0x10,(VDP16_MAP_V32 | VDP16_MAP_H64) /* layer size */
1363 write_vdp_reg 0x11,0
1364 write_vdp_reg 0x12,0
1368 # get mask of bits representing safe words
1369 # a1 - address to check
1370 # destroys d0-d2, strips upper bits from a1
1375 lea (safe_addrs,pc),a1
1376 move.w #(safe_addrs_end - safe_addrs)/8-1,d2
1398 /* check for VDP address */
1403 bne addr_unsafe /* not vdp */
1412 blt addr_hsafe_3 /* data port */
1414 blt addr_safe /* below PSG */
1416 bge addr_safe /* above PSG */
1419 moveq.l #0,d0 /* skip line */
1423 moveq.l #3,d0 /* skip 2 words */
1433 # read single phase from controller
1438 move.b #0x40,(0xa10003)
1442 move.b (0xa10003),d0
1443 move.b #0x00,(0xa10003)
1446 move.b (0xa10003),d0
1451 eor.w d0,d1 /* changed btns */
1452 move.w d0,d7 /* old val */
1454 and.w d0,d1 /* what changed now */
1459 and.b #0x0f,d2 /* do autorepeat */
1470 # Prepare to write to VDP RAM @a0
1471 # sets a0 to VDP data port for convenience
1477 move.l d0,(GFXCNTL).l
1482 # Load color data from ROM
1484 # a1: color list address
1485 # d0: number of colors to load
1491 move.l d0,(GFXCNTL).l
1506 # d2 - tile_bits[15:11]
1531 # d3 - tile_bits[15:11]|digit_cnt[7:0]
1532 # destroys a0, preserves d3
1543 ror.l d0,d2 /* prep value */
1544 subq.l #1,d1 /* count */
1546 and.w #0xf800,d0 /* keep upper bits in d0 */
1559 dbra d1,_print_hex_loop
1564 # wait vertical sync interrupt
1575 # wait vsync start (polling)
1599 jmp 0x123456 /* will be patched */
1602 #################################################
1606 #################################################
1614 # vim:filetype=asmM68k