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
225 .ascii "Go to address\0"
227 .ascii "Go to (predef)\0"
229 .ascii "Jump to address\0"
231 .ascii "PC Transfer\0"
233 .ascii "DTACK safety\0"
235 .ascii "Transfer Ready\0"
239 .ascii "DTACK err?\0"
241 .ascii "Exception \0"
243 ##################################################
247 ##################################################
250 # a6 = page_start[31:8]|cursor_offs[7:0]
251 # d7 = old_inputs[31:16]|edit_bytes[15:14]|g_mode_old[13:11]|g_mode[10:8]|irq_cnt[7:0]
252 # d6 = edit_word_save[31:15]|edit_done[7]|no_dtack_detect[4]|autorep_cnt[3:0]
254 # edit: edit_word[31:8]|edit_pos[4:2]|byte_cnt[1:0]
260 /* make sure io port 2 is doing inputs */
261 move.b #0,(0xa1000b).l
262 /* mask irqs during init */
266 /* copy to expansion device if magic number is set */
272 move.w #0x2000/8-1,d0
281 /* we could be relocated by 32x or something else, adjust start addr */
287 /* copy, assume 8K size */
289 move.w #0x2000/8-1,d0
296 lea (test_code,pc),a0
298 move.w #(test_code_end - test_code)/2-1,d0
309 /* patch test code */
311 add.w #(test_code_ret_op-test_code+2),a1
323 move.b #0x40,(0xa10009).l
324 move.b #0x40,(0xa10003).l
329 /* Clear h/v scroll */
331 VRAM_ADDR 0x8000,(GFXCNTL)
333 VSRAM_ADDR 0,(GFXCNTL)
336 /* Load color data */
339 moveq.l #(colors_end-colors)/2,d0
342 /* load font patterns */
345 VRAM_ADDR 0,(GFXCNTL)
357 rol.l #1,d1 /* fixup */
361 /* generate A layer map */
369 0: move.l #0x00000000,(a0)
375 /* generate B layer map */
380 0: move.l #0x00000000,(a0)
383 /* upload sprite data */
386 lea (sprite_data,pc),a1
388 move.l #(sprite_data_end-sprite_data)/2-1,d3
393 /* wait for vsync before unmask */
396 /* wait a bit to avoid nested vint */
399 dbra d0,0b /* 10 cycles to go back */
401 /* enable and unmask vint */
402 write_vdp_r_dst 1,(VDP1_E_VBI | VDP1_E_DISPLAY | VDP1_MODE5),(GFXCNTL)
406 ##################################################
419 /* let's hope VRAM is already set up.. */
427 ##################################################
431 # movem.l d0-d4/a0-a5,-(a7)
433 btst.b #5,(0xa10005).l
435 change_mode MMODE_PC, MMODE_MAIN
436 write_vdp_r_dst 12,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320 | VDP12_STE),(GFXCNTL)
443 lea (jumptab,pc,d0),a0
446 /* branch insns here because we want to be position independent */
449 bra mode_edit_val /* edit val in editor */
456 ##################### main #######################
459 /* assume we will hang */
460 lea (txt_dtack_err,pc),a0
470 move.l d0,a1 /* current addr */
473 add.b #27-1,d1 /* line where the cursor sits */
477 move.l #27-1,d5 /* line counter for dbra */
500 # unsafe or partially safe
503 swap d4 /* mask in upper word */
505 bne draw_row_hsafe_words_pre
507 draw_row_hsafe_bytes_pre:
512 draw_row_hsafe_bytes:
518 move.l #'?'|('?'<<16),(a0)
520 move.l #'?'|('?'<<16),(a0)
530 dbra d4,draw_row_hsafe_bytes
537 beq draw_cursor_unsafe_byte
538 bra draw_chars_hsafe_pre
540 draw_row_hsafe_words_pre:
545 draw_row_hsafe_words:
551 move.l #'?'|('?'<<16),(a0)
552 move.l #'?'|('?'<<16),(a0)
559 dbra d4,draw_row_hsafe_words
561 move.l #(' '<<16)|' ',(a0)
566 beq draw_cursor_unsafe_word
568 draw_chars_hsafe_pre:
578 move.l #'?'|('?'<<16),(a0)
579 bra draw_chars_hsafe_next
581 btst.l #15,d7 /* must perform correct read type */
582 bne 0f /* doing byte reads on security reg hangs */
609 draw_chars_hsafe_next:
611 dbra d4,draw_chars_hsafe
613 move.l #(' '<<16)|' ',(a0)
652 move.l #(' '<<16)|' ',(a0)
674 move.l #(' '<<16)|' ',(a0)
696 move.l #' '|(' '<<16),(a0)
697 move.l #' '|(' '<<16),(a0)
702 jsr get_input /* x0cbrldu x1sa00du */
704 btst.l #16+4,d0 /* A - scroll modifier */
707 do_dpad 16+0, sub, #0x0800
708 do_dpad 16+1, add, #0x0800
709 do_dpad 16+10, sub, #0xd800
710 do_dpad 16+11, add, #0xd800
717 do_dpad 0, subq, #0x0008
718 do_dpad 1, addq, #0x0008
739 btst.l #12,d0 /* B - switch byte/word mode */
742 add.w #0x4000,d7 /* changes between 01 10 */
745 sub.l d1,a6 /* make even, just in case */
748 btst.l #13,d0 /* C - edit selected byte */
751 change_mode MMODE_EDIT_VAL, MMODE_MAIN
752 write_vdp_r_dst 12,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320 | VDP12_STE),(GFXCNTL)
755 btst.l #5,d0 /* Start - menu */
759 change_mode MMODE_START_MENU, MMODE_MAIN
760 write_vdp_r_dst 12,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320 | VDP12_STE),(GFXCNTL)
764 # movem.l (a7)+,d0-d4/a0-a5
772 draw_cursor_unsafe_byte:
774 and.l #7,d0 /* byte offs */
777 add.b d1,d0 /* d0 *= 3 (chars) */
781 move.l #(0x2000|'?'|((0x2000|'?')<<16)),(a0)
785 jsr load_prepare /* restore a0 */
786 bra draw_chars_hsafe_pre
788 draw_cursor_unsafe_word:
790 and.l #7,d0 /* byte offs */
792 lsr.b #1,d1 /* which word */
795 add.b d2,d1 /* num of chars to skip */
800 move.l #(0x2000|'?'|((0x2000|'?')<<16)),d0
806 jsr load_prepare /* restore a0 */
807 bra draw_chars_hsafe_pre
812 and.l #7,d0 /* byte offs */
818 add.b d1,d0 /* d0 *= 3 (chars) */
826 jsr load_prepare /* restore a0 */
832 and.l #7,d0 /* byte offs */
834 lsr.b #1,d1 /* which word */
837 add.b d2,d1 /* num of chars to skip */
848 jsr load_prepare /* restore a0 */
853 #################### hedit #######################
857 bne mode_hedit_finish
859 /* read val to edit */
875 change_mode MMODE_VAL_INPUT, MMODE_EDIT_VAL
894 ##################### goto #######################
905 or.b #3,d5 /* 3 bytes */
907 change_mode MMODE_VAL_INPUT, MMODE_GOTO
927 ################### val edit #####################
931 movea.l #0xe000+14*2+11*64*2,a1
951 lea (txt_a_confirm,pc),a0
962 and.b #3,d3 /* edit field bytes */
980 lsr.b #1,d1 /* length in bytes */
984 and.b #7,d1 /* nibble to edit */
988 sub.b #1,d3 /* chars to shift out */
999 jsr get_input /* x0cbrldu x1sa00du */
1006 add.b d1,d1 /* nibble count */
1007 sub.b #1,d1 /* max n.t.e. val */
1010 and.b #7,d2 /* nibble to edit */
1022 lsl.l d1,d3 /* mask */
1023 lsl.l d1,d4 /* what to add/sub */
1034 eor.l #0xffffffff,d3
1068 btst.l #4,d0 /* A - confirm */
1071 move.w d7,d1 /* back to prev mode */
1081 ################### start menu ###################
1088 menu_text txt_about, 13, 9, 1
1089 menu_text txt_goto, 13, 11, 0
1090 menu_text txt_goto_predef, 13, 12, 0
1091 menu_text txt_jmp_addr, 13, 13, 0
1092 menu_text txt_dump, 13, 14, 0
1093 menu_text txt_dtack, 13, 15, 0
1094 menu_text txt_a_confirm, 13, 17, 2
1096 /* dtack safety on/off */
1097 movea.l #0xe000+26*2+15*64*2,a0
1099 move.w #0x8000|'O',(a0)
1102 move.w #0x8000|'N',(a0)
1105 move.w #0x8000|'F',(a0)
1106 move.w #0x8000|'F',(a0)
1110 movea.l #0xe000+11*2+11*64*2,a0
1120 jsr get_input /* x0cbrldu x1sa00du */
1129 or.b #1,d2 /* up -1, down 1 */
1144 btst.l #4,d0 /* A - confirm */
1149 change_mode MMODE_GOTO, MMODE_MAIN
1156 change_mode MMODE_GOTO_PREDEF, MMODE_MAIN
1162 change_mode MMODE_JMP_ADDR, MMODE_MAIN
1168 change_mode MMODE_PC, MMODE_MAIN
1188 movea.l #0xe000+10*2+8*64*2,a1
1202 ################### goto predef ##################
1206 movea.l #0xe000+14*2+8*64*2,a1
1207 move.l #predef_addr_cnt+2-1,d1
1219 /* draw addresses */
1220 movea.l #0xe000+17*2+9*64*2,a1
1221 lea (predef_addrs,pc),a2
1222 move.w #predef_addr_cnt-1,d4
1228 jsr print_hex_preped
1233 movea.l #0xe000+15*2+9*64*2,a0
1242 jsr get_input /* x0cbrldu x1sa00du */
1249 or.b #1,d2 /* up -1, down 1 */
1253 move.b #predef_addr_cnt-1,d5
1255 cmp.b #predef_addr_cnt-1,d5
1262 btst.l #4,d0 /* A - confirm */
1267 lea (predef_addrs,pc),a0
1270 bra mode_goto_finish
1281 ##################### jmp ########################
1288 or.b #3,d5 /* 3 bytes */
1290 change_mode MMODE_VAL_INPUT, MMODE_JMP_ADDR
1295 write_vdp_r_dst 1,(VDP1_E_DISPLAY | VDP1_MODE5),(GFXCNTL) /* disable vint */
1300 move.b #0x40,(0xa1000b).l /* port 2 ctrl */
1301 move.b #0x00,(0xa10005).l /* port 2 data - start with TH low */
1303 lea (txt_transfer_ready,pc),a0
1310 move.b (0xa10005),d0
1314 menu_text txt_working, 13, 13, 0
1317 # go back to main mode
1319 bclr.l #7,d6 /* not edited */
1320 change_mode MMODE_MAIN, MMODE_MAIN
1321 write_vdp_r_dst 12,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320),(GFXCNTL)
1325 #################################################
1327 # Initialize VDP registers #
1329 #################################################
1333 write_vdp_reg 0,(VDP0_E_DISPLAY | VDP0_PLTT_FULL)
1334 write_vdp_reg 1,(VDP1_E_DISPLAY | VDP1_MODE5)
1335 write_vdp_reg 2,(0xe000 >> 10) /* Screen map a adress */
1336 write_vdp_reg 3,(0xe000 >> 10) /* Window address */
1337 write_vdp_reg 4,(0xc000 >> 13) /* Screen map b address */
1338 write_vdp_reg 5,(0xfc00 >> 9) /* Sprite address */
1340 write_vdp_reg 7,0 /* Backdrop color */
1341 write_vdp_reg 0x0a,1 /* Lines per hblank interrupt */
1342 write_vdp_reg 0x0b,0 /* 2-cell vertical scrolling */
1343 write_vdp_reg 0x0c,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320)
1344 write_vdp_reg 0x0d,(0x8000 >> 10) /* Horizontal scroll address */
1345 write_vdp_reg 0x0e,0
1346 write_vdp_reg 0x0f,2
1347 write_vdp_reg 0x10,(VDP16_MAP_V32 | VDP16_MAP_H64) /* layer size */
1348 write_vdp_reg 0x11,0
1349 write_vdp_reg 0x12,0
1353 # get mask of bits representing safe words
1354 # a1 - address to check
1355 # destroys d0-d2, strips upper bits from a1
1360 lea (safe_addrs,pc),a1
1361 move.w #(safe_addrs_end - safe_addrs)/8-1,d2
1383 /* check for VDP address */
1388 bne addr_unsafe /* not vdp */
1397 blt addr_hsafe_3 /* data port */
1399 blt addr_safe /* below PSG */
1401 bge addr_safe /* above PSG */
1404 moveq.l #0,d0 /* skip line */
1408 moveq.l #3,d0 /* skip 2 words */
1418 # read single phase from controller
1423 move.b #0x40,(0xa10003)
1427 move.b (0xa10003),d0
1428 move.b #0x00,(0xa10003)
1431 move.b (0xa10003),d0
1436 eor.w d0,d1 /* changed btns */
1437 move.w d0,d7 /* old val */
1439 and.w d0,d1 /* what changed now */
1444 and.b #0x0f,d2 /* do autorepeat */
1455 # Prepare to write to VDP RAM @a0
1456 # sets a0 to VDP data port for convenience
1462 move.l d0,(GFXCNTL).l
1467 # Load color data from ROM
1469 # a1: color list address
1470 # d0: number of colors to load
1476 move.l d0,(GFXCNTL).l
1491 # d2 - tile_bits[15:11]
1516 # d3 - tile_bits[15:11]|digit_cnt[7:0]
1517 # destroys a0, preserves d3
1528 ror.l d0,d2 /* prep value */
1529 subq.l #1,d1 /* count */
1531 and.w #0xf800,d0 /* keep upper bits in d0 */
1544 dbra d1,_print_hex_loop
1549 # wait vertical sync interrupt
1560 # wait vsync start (polling)
1584 jmp 0x123456 /* will be patched */
1587 #################################################
1591 #################################################
1599 # vim:filetype=asmM68k