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
448 bra mode_edit_val /* edit val in editor */
455 ##################### main #######################
458 /* assume we will hang */
459 lea (txt_dtack_err,pc),a0
469 move.l d0,a1 /* current addr */
472 add.b #27-1,d1 /* line where the cursor sits */
476 move.l #27-1,d5 /* line counter for dbra */
499 # unsafe or partially safe
502 swap d4 /* mask in upper word */
504 bne draw_row_hsafe_words_pre
506 draw_row_hsafe_bytes_pre:
511 draw_row_hsafe_bytes:
517 move.l #'?'|('?'<<16),(a0)
519 move.l #'?'|('?'<<16),(a0)
529 dbra d4,draw_row_hsafe_bytes
536 beq draw_cursor_unsafe_byte
537 bra draw_chars_hsafe_pre
539 draw_row_hsafe_words_pre:
544 draw_row_hsafe_words:
550 move.l #'?'|('?'<<16),(a0)
551 move.l #'?'|('?'<<16),(a0)
558 dbra d4,draw_row_hsafe_words
560 move.l #(' '<<16)|' ',(a0)
565 beq draw_cursor_unsafe_word
567 draw_chars_hsafe_pre:
577 move.l #'?'|('?'<<16),(a0)
578 bra draw_chars_hsafe_next
580 btst.l #15,d7 /* must perform correct read type */
581 bne 0f /* doing byte reads on security reg hangs */
608 draw_chars_hsafe_next:
610 dbra d4,draw_chars_hsafe
612 move.l #(' '<<16)|' ',(a0)
651 move.l #(' '<<16)|' ',(a0)
673 move.l #(' '<<16)|' ',(a0)
695 move.l #' '|(' '<<16),(a0)
696 move.l #' '|(' '<<16),(a0)
701 jsr get_input /* x0cbrldu x1sa00du */
703 btst.l #16+4,d0 /* A - scroll modifier */
706 do_dpad 16+0, sub, #0x0800
707 do_dpad 16+1, add, #0x0800
708 do_dpad 16+10, sub, #0xd800
709 do_dpad 16+11, add, #0xd800
716 do_dpad 0, subq, #0x0008
717 do_dpad 1, addq, #0x0008
738 btst.l #12,d0 /* B - switch byte/word mode */
741 add.w #0x4000,d7 /* changes between 01 10 */
744 sub.l d1,a6 /* make even, just in case */
747 btst.l #13,d0 /* C - edit selected byte */
750 change_mode MMODE_EDIT_VAL, MMODE_MAIN
751 write_vdp_r_dst 12,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320 | VDP12_STE),(GFXCNTL)
754 btst.l #5,d0 /* Start - menu */
758 change_mode MMODE_START_MENU, MMODE_MAIN
759 write_vdp_r_dst 12,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320 | VDP12_STE),(GFXCNTL)
763 # movem.l (a7)+,d0-d4/a0-a5
771 draw_cursor_unsafe_byte:
773 and.l #7,d0 /* byte offs */
776 add.b d1,d0 /* d0 *= 3 (chars) */
780 move.l #(0x2000|'?'|((0x2000|'?')<<16)),(a0)
784 jsr load_prepare /* restore a0 */
785 bra draw_chars_hsafe_pre
787 draw_cursor_unsafe_word:
789 and.l #7,d0 /* byte offs */
791 lsr.b #1,d1 /* which word */
794 add.b d2,d1 /* num of chars to skip */
799 move.l #(0x2000|'?'|((0x2000|'?')<<16)),d0
805 jsr load_prepare /* restore a0 */
806 bra draw_chars_hsafe_pre
811 and.l #7,d0 /* byte offs */
817 add.b d1,d0 /* d0 *= 3 (chars) */
825 jsr load_prepare /* restore a0 */
831 and.l #7,d0 /* byte offs */
833 lsr.b #1,d1 /* which word */
836 add.b d2,d1 /* num of chars to skip */
847 jsr load_prepare /* restore a0 */
852 #################### hedit #######################
856 bne mode_hedit_finish
858 /* read val to edit */
874 change_mode MMODE_VAL_INPUT, MMODE_EDIT_VAL
893 ##################### goto #######################
904 or.b #3,d5 /* 3 bytes */
906 change_mode MMODE_VAL_INPUT, MMODE_GOTO
926 ################### val edit #####################
930 movea.l #0xe000+14*2+11*64*2,a1
950 lea (txt_a_confirm,pc),a0
961 and.b #3,d3 /* edit field bytes */
979 lsr.b #1,d1 /* length in bytes */
983 and.b #7,d1 /* nibble to edit */
987 sub.b #1,d3 /* chars to shift out */
998 jsr get_input /* x0cbrldu x1sa00du */
1005 add.b d1,d1 /* nibble count */
1006 sub.b #1,d1 /* max n.t.e. val */
1009 and.b #7,d2 /* nibble to edit */
1021 lsl.l d1,d3 /* mask */
1022 lsl.l d1,d4 /* what to add/sub */
1033 eor.l #0xffffffff,d3
1067 btst.l #4,d0 /* A - confirm */
1070 move.w d7,d1 /* back to prev mode */
1080 ################### start menu ###################
1087 menu_text txt_about, 13, 9, 1
1088 menu_text txt_goto, 13, 11, 0
1089 menu_text txt_goto_predef, 13, 12, 0
1090 menu_text txt_jmp_addr, 13, 13, 0
1091 menu_text txt_dump, 13, 14, 0
1092 menu_text txt_dtack, 13, 15, 0
1093 menu_text txt_a_confirm, 13, 17, 2
1095 /* dtack safety on/off */
1096 movea.l #0xe000+26*2+15*64*2,a0
1098 move.w #0x8000|'O',(a0)
1101 move.w #0x8000|'N',(a0)
1104 move.w #0x8000|'F',(a0)
1105 move.w #0x8000|'F',(a0)
1109 movea.l #0xe000+11*2+11*64*2,a0
1119 jsr get_input /* x0cbrldu x1sa00du */
1128 or.b #1,d2 /* up -1, down 1 */
1143 btst.l #4,d0 /* A - confirm */
1148 change_mode MMODE_GOTO, MMODE_MAIN
1155 change_mode MMODE_GOTO_PREDEF, MMODE_MAIN
1161 change_mode MMODE_JMP_ADDR, MMODE_MAIN
1167 change_mode MMODE_PC, MMODE_MAIN
1187 movea.l #0xe000+10*2+8*64*2,a1
1201 ################### goto predef ##################
1205 movea.l #0xe000+14*2+8*64*2,a1
1206 move.l #predef_addr_cnt+2-1,d1
1218 /* draw addresses */
1219 movea.l #0xe000+17*2+9*64*2,a1
1220 lea (predef_addrs,pc),a2
1221 move.w #predef_addr_cnt-1,d4
1227 jsr print_hex_preped
1232 movea.l #0xe000+15*2+9*64*2,a0
1241 jsr get_input /* x0cbrldu x1sa00du */
1248 or.b #1,d2 /* up -1, down 1 */
1252 move.b #predef_addr_cnt-1,d5
1254 cmp.b #predef_addr_cnt-1,d5
1261 btst.l #4,d0 /* A - confirm */
1266 lea (predef_addrs,pc),a0
1269 bra mode_goto_finish
1280 ##################### jmp ########################
1287 or.b #3,d5 /* 3 bytes */
1289 change_mode MMODE_VAL_INPUT, MMODE_JMP_ADDR
1294 write_vdp_r_dst 1,(VDP1_E_DISPLAY | VDP1_MODE5),(GFXCNTL) /* disable vint */
1299 move.b #0x40,(0xa1000b).l /* port 2 ctrl */
1300 move.b #0x00,(0xa10005).l /* port 2 data - start with TH low */
1302 lea (txt_transfer_ready,pc),a0
1309 move.b (0xa10005),d0
1313 menu_text txt_working, 13, 13, 0
1316 # go back to main mode
1318 bclr.l #7,d6 /* not edited */
1319 change_mode MMODE_MAIN, MMODE_MAIN
1320 write_vdp_r_dst 12,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320),(GFXCNTL)
1324 #################################################
1326 # Initialize VDP registers #
1328 #################################################
1332 write_vdp_reg 0,(VDP0_E_DISPLAY | VDP0_PLTT_FULL)
1333 write_vdp_reg 1,(VDP1_E_DISPLAY | VDP1_MODE5)
1334 write_vdp_reg 2,(0xe000 >> 10) /* Screen map a adress */
1335 write_vdp_reg 3,(0xe000 >> 10) /* Window address */
1336 write_vdp_reg 4,(0xc000 >> 13) /* Screen map b address */
1337 write_vdp_reg 5,(0xfc00 >> 9) /* Sprite address */
1339 write_vdp_reg 7,0 /* Backdrop color */
1340 write_vdp_reg 0x0a,1 /* Lines per hblank interrupt */
1341 write_vdp_reg 0x0b,0 /* 2-cell vertical scrolling */
1342 write_vdp_reg 0x0c,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320)
1343 write_vdp_reg 0x0d,(0x8000 >> 10) /* Horizontal scroll address */
1344 write_vdp_reg 0x0e,0
1345 write_vdp_reg 0x0f,2
1346 write_vdp_reg 0x10,(VDP16_MAP_V32 | VDP16_MAP_H64) /* layer size */
1347 write_vdp_reg 0x11,0
1348 write_vdp_reg 0x12,0
1352 # get mask of bits representing safe words
1353 # a1 - address to check
1354 # destroys d0-d2, strips upper bits from a1
1359 lea (safe_addrs,pc),a1
1360 move.w #(safe_addrs_end - safe_addrs)/8-1,d2
1382 /* check for VDP address */
1387 bne addr_unsafe /* not vdp */
1396 blt addr_hsafe_3 /* data port */
1398 blt addr_safe /* below PSG */
1400 bge addr_safe /* above PSG */
1403 moveq.l #0,d0 /* skip line */
1407 moveq.l #3,d0 /* skip 2 words */
1417 # read single phase from controller
1422 move.b #0x40,(0xa10003)
1426 move.b (0xa10003),d0
1427 move.b #0x00,(0xa10003)
1430 move.b (0xa10003),d0
1435 eor.w d0,d1 /* changed btns */
1436 move.w d0,d7 /* old val */
1438 and.w d0,d1 /* what changed now */
1443 and.b #0x0f,d2 /* do autorepeat */
1454 # Prepare to write to VDP RAM @a0
1455 # sets a0 to VDP data port for convenience
1461 move.l d0,(GFXCNTL).l
1466 # Load color data from ROM
1468 # a1: color list address
1469 # d0: number of colors to load
1475 move.l d0,(GFXCNTL).l
1490 # d2 - tile_bits[15:11]
1515 # d3 - tile_bits[15:11]|digit_cnt[7:0]
1516 # destroys a0, preserves d3
1527 ror.l d0,d2 /* prep value */
1528 subq.l #1,d1 /* count */
1530 and.w #0xf800,d0 /* keep upper bits in d0 */
1543 dbra d1,_print_hex_loop
1548 # wait vertical sync interrupt
1559 # wait vsync start (polling)
1583 jmp 0x123456 /* will be patched */
1586 #################################################
1590 #################################################
1598 # vim:filetype=asmM68k