-##################################################
-# #
-# Assemble with gas #
-# --register-prefix-optional --bitwise-or #
-# #
-##################################################
+###############################################################################
+#
+# Copyright (c) 2009,2011 GraÅžvydas Ignotas
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+# * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+# * Redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution.
+# * Neither the name of the organization nor the
+# names of its contributors may be used to endorse or promote products
+# derived from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND ANY
+# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY
+# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+# Assemble with gas
+# --register-prefix-optional --bitwise-or
+#
+
+.equ USE_VINT, 0
+.equ COPY_TO_EXP, 1
+.equ RELOCATE_TO_RAM, 1
.text
.globl main
+.globl INT
.globl VBL
+.globl return_to_main
##################################################
# #
.equ VDP1_E_DMA, 0x10
.equ VDP1_NTSC, 0x00
.equ VDP1_PAL, 0x08
-.equ VDP1_RESERVED, 0x04
+.equ VDP1_MODE5, 0x04
.equ VDP12_STE, 0x08
.equ VDP12_SCREEN_V224, 0x00
.equ MMODE_GOTO, 3
.equ MMODE_START_MENU, 4
.equ MMODE_GOTO_PREDEF, 5
+.equ MMODE_JMP_ADDR, 6
+.equ MMODE_PC, 7
.equ predef_addr_cnt, ((predef_addrs_end-predef_addrs)/4)
write_vdp_r_dst \reg, \val, (a3)
.endm
-/* For immediate addresses */
-.macro VRAM_ADDR reg adr
- move.l #(((0x4000 + (\adr & 0x3fff)) << 16) + (\adr >> 14)),\reg
+# Set up address in VDP, control port in dst
+.macro VRAM_ADDR adr dst
+ move.l #(0x40000000 | ((\adr & 0x3fff) << 16) | (\adr >> 14)),\dst
.endm
-.macro CRAM_ADDR reg adr
- move.l #(((0xc000 + (\adr & 0x3fff)) << 16) + (\adr >> 14)),\reg
+.macro VSRAM_ADDR adr dst
+ move.l #(0x40000010 | ((\adr & 0x3fff) << 16) | (\adr >> 14)),\dst
.endm
.endm
-.macro VSCROLL_ADDR reg adr
- move.l #(((0x4000 + (\adr & 0x3fff)) << 16) + ((\adr >> 14) | 0x10)),\reg
-.endm
-
-
-.macro HSCROLL_ADDR reg adr
- move.l #(((0x4000 + (\adr & 0x3fff)) << 16) + (\adr >> 14)),\reg
-.endm
-
-
# convert tile coords in d0, d1 to nametable addr to a0
.macro XY2NT
lsl.w #6,d1
or.w #(\mode_back<<11)|(\mode_new<<8),d7
.endm
+# destroys a0,d0-d2
.macro menu_text str x y pal
- lea \str,a0
+ lea (\str,pc),a0
move.l #\x,d0
move.l #\y,d1
move.l #0x8000|(\pal<<13),d2
dc.w 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
dc.w 0x0000,0x0e44,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
dc.w 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
+ dc.w 0x0000,0x044e,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
+ dc.w 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
colors_end:
predef_addrs:
dc.l 0x000000, 0x200000, 0x400000, 0xa00000, 0xa10000
- dc.l 0xa11100, 0xa12000, 0xa13000, 0xc00000
+ dc.l 0xa11100, 0xa12000, 0xa13000, 0xa14000, 0xa15100
+ dc.l 0xc00000
predef_addrs_end:
safe_addrs:
dc.l 0x000000, 0x7fffff
dc.l 0xe00000, 0xffffff
- dc.l 0xa00000, 0xa163ff /* FIXME */
- /* TODO: VDP */
+ dc.l 0xa00000, 0xa100ff
+ dc.l 0xa11000, 0xa113ff
+ dc.l 0xa12000, 0xa120ff
+ dc.l 0xa13000, 0xa130ff
safe_addrs_end:
+ dc.l 0xa15100, 0xa1513f
+safe_addrs_end_32x:
+ dc.l 0xa15180, 0xa153ff
+safe_addrs_end_32x_vdp:
+
+sizeof_bin:
+ dc.l _edata
txt_edit:
.ascii "- edit -\0"
txt_a_confirm:
.ascii "A-confirm\0"
txt_about:
- .ascii "hexed r1\0"
+ .ascii "hexed r2\0"
txt_goto:
.ascii "Go to address\0"
txt_goto_predef:
.ascii "Go to (predef)\0"
+txt_jmp_addr:
+ .ascii "Jump to address\0"
+txt_dump:
+ .ascii "PC Transfer\0"
txt_dtack:
.ascii "DTACK safety\0"
+txt_transfer_ready:
+ .ascii "Transfer Ready\0"
+txt_working:
+ .ascii "PC mode \0"
+txt_dtack_err:
+ .ascii "DTACK err?\0"
+txt_exc:
+ .ascii "Exception \0"
##################################################
# #
.align 2
main:
- /* mask irqs during init */
+ /* make sure io port 2 is doing inputs */
+ move.b #0,(0xa1000b).l
+ /* make sure irqs are masked */
move.w #0x2700,sr
+ /* take care of TMSS */
+ move.b (0xa10000).l,d0
+ andi.b #0x0f,d0
+ beq no_tmss
+ move.l #0x53454741,(0xa14000).l
+ /* want cart, not OS rom if cart pops in */
+ move.w #1,(0xa14100).l
+ /* touch VDP after TMSS setup? */
+ tst.w (0xc00004).l
+no_tmss:
+
+ /* want to do early PC transfer (with RAM/VRAM intact and such)?
+ * also give time PC to see start condition */
+ move.l #0x2000,d0
+0: dbra d0,0b
+
+ move.l #0xa10005,a0
+ btst.b #5,(a0)
+ bne no_early_transfer
+move.b #1,(0)
+ move.b #0x40,(0xa1000b).l /* port 2 ctrl */
+ move.b #0x00,(a0) /* port 2 data - start with TH low */
+ move.l #0x2000,d0
+0:
+ btst.b #4,(a0)
+ beq do_early_transfer
+ dbra d0,0b
-.if 0
- /* copy */
- lea (0,pc),a0
- move.l a0,d0
- swap d0
- lsr.l #4,d0
- and.b #0x0f,d0
- cmp.b #0,d0
+move.b #2,(0)
+ move.b #0,(0xa1000b).l
+ bra no_early_transfer /* timeout */
+
+do_early_transfer:
+move.b #9,(0)
+ bsr do_transfer
+
+no_early_transfer:
+
+.if COPY_TO_EXP
+ /* copy to expansion device if magic number is set */
+ move.l #0x400000,a1
+ cmp.w #0x1234,(a1)
bne 0f
- move.w #8000/2,d0
move.l #0,a0
- move.l #0x400000,a1
+ move.l (sizeof_bin,pc),d0
+ lsr.l #3,d0
+1:
+ move.l (a0)+,(a1)+
+ move.l (a0)+,(a1)+
+ dbra d0,1b
+0:
+.endif
+
+.if RELOCATE_TO_RAM
+ /* we could be relocated by 32x or something else, adjust start addr */
+ lea (pc),a0
+ move.l a0,d0
+ and.l #0xff0000,d0
+ move.l d0,a0
+
+ /* copy, assume 8K size */
+ move.l #0xFF0100,a1
+ move.l (sizeof_bin,pc),d0
+ lsr.l #3,d0
+1:
+ move.l (a0)+,(a1)+
+ move.l (a0)+,(a1)+
+ dbra d0,1b
+
+ /* copy test code */
+ lea (test_code,pc),a0
+ move.l #0xffc000,a1
+ move.w #(test_code_end - test_code)/2-1,d0
1:
move.w (a0)+,(a1)+
dbra d0,1b
+
+ lea (0f,pc),a0
+ move.l a0,d0
+ and.l #0x00ffff,d0
+ add.l #0xFF0100,d0
+ move.l d0,a0
+
+ /* patch test code */
+ move.l #0xffc000,a1
+ add.w #(test_code_ret_op-test_code+2),a1
+ move.l a0,(a1)
+
+ jmp (a0)
0:
.endif
/* Initialize VDP */
jsr init_gfx
+ /* Clear h/v scroll */
+ movea.l #GFXDATA,a0
+ VRAM_ADDR 0x8000,(GFXCNTL)
+ move.l #0,(a0)
+ VSRAM_ADDR 0,(GFXCNTL)
+ move.l #0,(a0)
+
/* Load color data */
movea.l #0,a0
- movea.l #colors,a1
+ lea (colors,pc),a1
moveq.l #(colors_end-colors)/2,d0
jsr load_colors
- /* load patterns */
- movea.l #0,a0
- movea.l #font,a1
- move.l #128,d0
- jsr load_tiles
+ /* load font patterns */
+ movea.l #GFXDATA,a0
+ lea (font,pc),a1
+ VRAM_ADDR 0,(GFXCNTL)
+ move.w #128*8,d3
+font_loop:
+ moveq.l #8-1,d2
+ moveq.l #0,d1
+ move.b (a1)+,d0
+0:
+ lsr.b #1,d0
+ roxl.l #1,d1
+ ror.l #5,d1
+ dbra d2,0b
+
+ rol.l #1,d1 /* fixup */
+ move.l d1,(a0)
+ dbra d3,font_loop
/* generate A layer map */
movea.l #0xe000,a1
/* upload sprite data */
movea.l #0xfc00,a0
jsr load_prepare
- movea.l #sprite_data,a1
+ lea (sprite_data,pc),a1
move.l #(sprite_data_end-sprite_data)/2-1,d3
0: move.l (a1)+,(a0)
dbra d3,0b
- move.w #0x2000,sr
+.if USE_VINT
+ /* wait for vsync before unmask */
+ jsr wait_vsync_poll
+
+ /* wait a bit to avoid nested vint */
+ move.w #20,d0
+0:
+ dbra d0,0b /* 10 cycles to go back */
+
+ /* enable and unmask vint */
+ write_vdp_r_dst 1,(VDP1_E_VBI | VDP1_E_DISPLAY | VDP1_MODE5),(GFXCNTL)
+ move.w #0x2000,sr
+.endif
##################################################
forever:
+.if USE_VINT
jsr wait_vsync
+.else
+ jsr wait_vsync_poll
+ jsr VBL
+.endif
bra forever
+INT:
+ /* let's hope VRAM is already set up.. */
+ lea (txt_exc,pc),a0
+ move.l #9,d0
+ move.l #27,d1
+ move.l #0xe000,d2
+ jsr print
+ bra forever
+
+##################################################
+
VBL:
addq.b #1,d7
- movem.l d0-d4/a0-a5,-(a7)
+# movem.l d0-d4/a0-a5,-(a7)
+ btst.b #5,(0xa10005).l
+ bne no_auto_transfer
+ change_mode MMODE_PC, MMODE_MAIN
+ write_vdp_r_dst 12,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320 | VDP12_STE),(GFXCNTL)
+
+no_auto_transfer:
moveq.l #0,d0
move.w d7,d0
lsr.w #6,d0
and.w #0x1c,d0
- move.l (jumptab,pc,d0),a0
+ lea (jumptab,pc,d0),a0
jmp (a0)
jumptab:
- dc.l mode_main
- dc.l mode_val_input
- dc.l mode_edit_val /* edit val in editor */
- dc.l mode_goto
- dc.l mode_start_menu
- dc.l mode_goto_predef
- dc.l mode_main
- dc.l mode_main
+ /* branch insns here because we want to be position independent */
+ bra mode_main
+ bra mode_val_input
+ bra mode_edit_val /* edit val in editor */
+ bra mode_goto
+ bra mode_start_menu
+ bra mode_goto_predef
+ bra mode_jmp_addr
+ bra mode_transfer
##################### main #######################
mode_main:
- clr.l d1
+ /* assume we will hang */
+ lea (txt_dtack_err,pc),a0
+ move.l #9,d0
+ move.l #27,d1
+ move.l #0xe000,d2
+ jsr print
+
+ moveq.l #0,d1
move.l a6,d0
move.b d0,d1
lsr.l #8,d0
btst.l #4,d6
bne draw_row_safe
- bsr is_addr_safe
- bne draw_row_safe
+ bsr get_safety_mask
+ cmp.b #0xf,d0
+ beq draw_row_safe
-# draw unreadable areas
+# unsafe or partially safe
+draw_row_hsafe:
+ move.l d0,d4
+ swap d4 /* mask in upper word */
btst.l #15,d7
- bne draw_row_unsafe_words
+ bne draw_row_hsafe_words_pre
-draw_row_unsafe_bytes:
+draw_row_hsafe_bytes_pre:
/* 8 bytes */
- moveq.l #8-1,d4
-0:
+ moveq.l #2,d3
+ move.w #3,d4
+
+draw_row_hsafe_bytes:
move.w #' ',(a0)
+ move.b d4,d0
+ add.b #16,d0
+ btst.l d0,d4
+ bne 0f
move.l #'?'|('?'<<16),(a0)
- dbra d4,0b
+ move.w #' ',(a0)
+ move.l #'?'|('?'<<16),(a0)
+ bra 1f
+0:
+ move.b (0,a1),d2
+ jsr print_hex_preped
+ move.w #' ',(a0)
+ move.b (1,a1),d2
+ jsr print_hex_preped
+1:
+ addq.l #2,a1
+ dbra d4,draw_row_hsafe_bytes
move.w #' ',(a0)
swap d0
cmp.w d5,d0
beq draw_cursor_unsafe_byte
- bra draw_chars_unsafe
+ bra draw_chars_hsafe_pre
-draw_row_unsafe_words:
+draw_row_hsafe_words_pre:
/* 4 shorts */
- moveq.l #4-1,d4
-0:
+ moveq.l #4,d3
+ move.w #3,d4
+
+draw_row_hsafe_words:
move.w #' ',(a0)
+ move.b d4,d0
+ add.b #16,d0
+ btst.l d0,d4
+ bne 0f
move.l #'?'|('?'<<16),(a0)
move.l #'?'|('?'<<16),(a0)
- dbra d4,0b
+ bra 1f
+0:
+ move.w (a1),d2
+ jsr print_hex_preped
+1:
+ addq.l #2,a1
+ dbra d4,draw_row_hsafe_words
move.l #(' '<<16)|' ',(a0)
cmp.w d5,d0
beq draw_cursor_unsafe_word
-draw_chars_unsafe:
- move.l #'?'|('?'<<16),(a0)
- move.l #'?'|('?'<<16),(a0)
- move.l #'?'|('?'<<16),(a0)
+draw_chars_hsafe_pre:
+ subq.l #8,a1
+ move.w #3,d4
+ moveq.l #0,d0
+
+draw_chars_hsafe:
+ move.b d4,d0
+ add.b #16,d0
+ btst.l d0,d4
+ bne 0f
move.l #'?'|('?'<<16),(a0)
+ bra draw_chars_hsafe_next
+0:
+ btst.l #15,d7 /* must perform correct read type */
+ bne 0f /* doing byte reads on security reg hangs */
+ move.b (0,a1),d0
+ lsl.l #8,d0
+ move.b (1,a1),d0
+ bra 1f
+0:
+ move.w (a1),d0
+1:
+ ror.l #8,d0
+ move.b d0,d1
+ sub.b #0x20,d1
+ cmp.b #0x60,d1
+ blo 0f
+ move.b #'.',d0
+0:
+ move.w d0,(a0)
+
+ move.b #0,d0
+ rol.l #8,d0
+ move.b d0,d1
+ sub.b #0x20,d1
+ cmp.b #0x60,d1
+ blo 0f
+ move.b #'.',d0
+0:
+ move.w d0,(a0)
+
+draw_chars_hsafe_next:
+ addq.l #2,a1
+ dbra d4,draw_chars_hsafe
move.l #(' '<<16)|' ',(a0)
- addq.l #8,a1
add.w #0x80,a2
dbra d5,draw_row
bra draw_status_bar
add.w #0x80,a2
dbra d5,draw_row
+
draw_status_bar:
/* status bar */
move.l a2,a0
mk_a6_addr d2
move.l #0x4006,d3
jsr print_hex_preped
- move.w #' ',(a0)
+
+ /* clear error */
+ moveq.l #5-1,d0
+0:
+ move.l #' '|(' '<<16),(a0)
+ move.l #' '|(' '<<16),(a0)
+ dbra d0,0b
+
/* handle input */
jsr get_input /* x0cbrldu x1sa00du */
input_nos:
vbl_end:
- movem.l (a7)+,d0-d4/a0-a5
+# movem.l (a7)+,d0-d4/a0-a5
+.if USE_VINT
rte
+.else
+ rts
+.endif
draw_cursor_unsafe_byte:
move.l a2,a0
add.w #31*2,a0
jsr load_prepare /* restore a0 */
- jmp draw_chars_unsafe
+ bra draw_chars_hsafe_pre
draw_cursor_unsafe_word:
move.l a6,d0
move.l a2,a0
add.w #29*2,a0
jsr load_prepare /* restore a0 */
- jmp draw_chars_unsafe
+ bra draw_chars_hsafe_pre
draw_cursor_byte:
add.w #31*2,a0
jsr load_prepare /* restore a0 */
- jmp draw_chars_pre
+ bra draw_chars_pre
draw_cursor_word:
move.l a6,d0
add.w #29*2,a0
jsr load_prepare /* restore a0 */
- jmp draw_chars_pre
+ bra draw_chars_pre
#################### hedit #######################
1:
change_mode MMODE_VAL_INPUT, MMODE_EDIT_VAL
- jmp vbl_end
+ bra vbl_end
mode_hedit_finish:
/* write the val */
or.b #3,d5 /* 3 bytes */
bclr.l #7,d6
change_mode MMODE_VAL_INPUT, MMODE_GOTO
- jmp vbl_end
+ bra vbl_end
mode_goto_finish:
lsr.l #8,d5
dbra d1,0b
/* text */
- lea txt_edit,a0
+ lea (txt_edit,pc),a0
move.l #15,d0
move.l #11,d1
move.l #0xc000,d2
jsr print
- lea txt_a_confirm,a0
+ lea (txt_a_confirm,pc),a0
move.l #15,d0
move.l #15,d1
move.l #0xc000,d2
eor.l #0xffffffff,d3
and.l d3,d5
or.l d1,d5
- jmp vbl_end
+ bra vbl_end
ai_no_ud:
btst.l #10,d0
and.b #0xe3,d5
lsl.b #2,d2
or.b d2,d5
- jmp vbl_end
+ bra vbl_end
ai_no_dpad:
move.w d0,d1
or.w d1,d7
ai_no_input:
- jmp vbl_end
+ bra vbl_end
################### start menu ###################
menu_text txt_about, 13, 9, 1
menu_text txt_goto, 13, 11, 0
menu_text txt_goto_predef, 13, 12, 0
- menu_text txt_dtack, 13, 13, 0
- menu_text txt_a_confirm, 13, 15, 2
+ menu_text txt_jmp_addr, 13, 13, 0
+ menu_text txt_dump, 13, 14, 0
+ menu_text txt_dtack, 13, 15, 0
+ menu_text txt_a_confirm, 13, 17, 2
/* dtack safety on/off */
- movea.l #0xe000+26*2+13*64*2,a0
+ movea.l #0xe000+26*2+15*64*2,a0
jsr load_prepare
move.w #0x8000|'O',(a0)
btst.l #4,d6
movea.l #0xe000+11*2+11*64*2,a0
moveq.l #0,d0
move.b d5,d0
- and.b #3,d0
+ and.b #7,d0
lsl.w #7,d0
add.w d0,a0
jsr load_prepare
and.w #3,d1
beq msm_no_ud
move.b d5,d1
- and.b #3,d1
+ and.b #7,d1
btst.l #0,d0
sne d2
or.b #1,d2 /* up -1, down 1 */
add.b d2,d1
cmp.b #0,d1
bge 0f
- move.b #2,d1
+ move.b #4,d1
0:
- cmp.b #2,d1
+ cmp.b #4,d1
ble 0f
move.b #0,d1
0:
- and.b #0xfc,d5
+ and.b #0xf8,d5
or.b d1,d5
- jmp vbl_end
+ bra vbl_end
msm_no_ud:
btst.l #4,d0 /* A - confirm */
beq msm_no_a
move.b d5,d1
- and.b #3,d1
+ and.b #7,d1
bne 0f
change_mode MMODE_GOTO, MMODE_MAIN
bsr start_menu_box
- jmp vbl_end
+ bra vbl_end
0:
cmp.b #1,d1
bne 0f
moveq.l #0,d5
change_mode MMODE_GOTO_PREDEF, MMODE_MAIN
bsr start_menu_box
- jmp vbl_end
+ bra vbl_end
0:
cmp.b #2,d1
bne 0f
+ change_mode MMODE_JMP_ADDR, MMODE_MAIN
+ bsr start_menu_box
+ bra vbl_end
+0:
+ cmp.b #3,d1
+ bne 0f
+ change_mode MMODE_PC, MMODE_MAIN
+ bsr start_menu_box
+ bra vbl_end
+0:
+ cmp.b #4,d1
+ bne 0f
bchg.l #4,d6
- jmp vbl_end
+ bra vbl_end
0:
msm_no_a:
bra return_to_main
msm_no_bc:
- jmp vbl_end
+ bra vbl_end
start_menu_box:
movea.l #0xe000+10*2+8*64*2,a1
- move.w #9-1,d1
+ move.w #11-1,d1
0:
move.w a1,a0
jsr load_prepare
/* draw addresses */
movea.l #0xe000+17*2+9*64*2,a1
- lea predef_addrs,a2
+ lea (predef_addrs,pc),a2
move.w #predef_addr_cnt-1,d4
move.l #0x8006,d3
mgp_da_loop:
ble 0f
move.b #0,d5
0:
- jmp vbl_end
+ bra vbl_end
mgp_no_ud:
btst.l #4,d0 /* A - confirm */
moveq.l #0,d0
move.b d5,d0
lsl.w #2,d0
- lea predef_addrs,a0
+ lea (predef_addrs,pc),a0
move.l (a0,d0),d5
lsl.l #8,d5
- jmp mode_goto_finish
+ bra mode_goto_finish
mgp_no_a:
move.w d0,d1
bra return_to_main
mgp_no_bc:
- jmp vbl_end
+ bra vbl_end
+##################### jmp ########################
+
+mode_jmp_addr:
+ btst.l #7,d6
+ bne mode_jmp_finish
+
+ moveq.l #0,d5
+ or.b #3,d5 /* 3 bytes */
+ bclr.l #7,d6
+ change_mode MMODE_VAL_INPUT, MMODE_JMP_ADDR
+ bra vbl_end
+
+mode_jmp_finish:
+ lsr.l #8,d5
+ write_vdp_r_dst 1,(VDP1_E_DISPLAY | VDP1_MODE5),(GFXCNTL) /* disable vint */
+ move.l d5,a0
+ jmp (a0)
+
+mode_transfer:
+ move.b #0x40,(0xa1000b).l /* port 2 ctrl */
+ move.b #0x00,(0xa10005).l /* port 2 data - start with TH low */
+
+ lea (txt_transfer_ready,pc),a0
+ move.l #13,d0
+ move.l #13,d1
+ move.l #0x8000,d2
+ jsr print
+
+wait_tl_low0:
+ move.b (0xa10005),d0
+ btst.b #4,d0
+ bne wait_tl_low0
+
+ menu_text txt_working, 13, 13, 0
+ bsr do_transfer
+ bra return_to_main
# go back to main mode
return_to_main:
bclr.l #7,d6 /* not edited */
change_mode MMODE_MAIN, MMODE_MAIN
write_vdp_r_dst 12,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320),(GFXCNTL)
- jmp vbl_end
+ bra vbl_end
#################################################
init_gfx:
move.l #GFXCNTL,a3
write_vdp_reg 0,(VDP0_E_DISPLAY | VDP0_PLTT_FULL)
- write_vdp_reg 1,(VDP1_E_VBI | VDP1_E_DISPLAY | VDP1_E_DMA | VDP1_RESERVED)
+ write_vdp_reg 1,(VDP1_E_DISPLAY | VDP1_MODE5)
write_vdp_reg 2,(0xe000 >> 10) /* Screen map a adress */
write_vdp_reg 3,(0xe000 >> 10) /* Window address */
write_vdp_reg 4,(0xc000 >> 13) /* Screen map b address */
write_vdp_reg 5,(0xfc00 >> 9) /* Sprite address */
write_vdp_reg 6,0
write_vdp_reg 7,0 /* Backdrop color */
- write_vdp_reg 10,1 /* Lines per hblank interrupt */
- write_vdp_reg 11,0 /* 2-cell vertical scrolling */
- write_vdp_reg 12,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320)
- write_vdp_reg 13,(0x8000 >> 10) /* Horizontal scroll address */
- write_vdp_reg 15,2
- write_vdp_reg 16,(VDP16_MAP_V32 | VDP16_MAP_H64) /* layer size */
- write_vdp_reg 17,0
- write_vdp_reg 18,0xff
+ write_vdp_reg 0x0a,1 /* Lines per hblank interrupt */
+ write_vdp_reg 0x0b,0 /* 2-cell vertical scrolling */
+ write_vdp_reg 0x0c,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320)
+ write_vdp_reg 0x0d,(0x8000 >> 10) /* Horizontal scroll address */
+ write_vdp_reg 0x0e,0
+ write_vdp_reg 0x0f,2
+ write_vdp_reg 0x10,(VDP16_MAP_V32 | VDP16_MAP_H64) /* layer size */
+ write_vdp_reg 0x11,0
+ write_vdp_reg 0x12,0
rts
-# determine if address packed in a6 is safe
+# get mask of bits representing safe words
# a1 - address to check
# destroys d0-d2, strips upper bits from a1
-is_addr_safe:
+get_safety_mask:
move.l a1,d1
lsl.l #8,d1
lsr.l #8,d1
- lea safe_addrs,a1
+ lea (safe_addrs,pc),a1
move.w #(safe_addrs_end - safe_addrs)/8-1,d2
+ cmp.l #0x4D415253,(0xa130ec) /* 'MARS' */
+ bne no_32x
+ move.w #(safe_addrs_end_32x - safe_addrs)/8-1,d2
+ move.w (0xa15100),d0
+ and.w #3,d0
+ cmp.w #3,d0 /* ADEN and nRES */
+ bne no_32x_vdp
+ btst.b #7,d0 /* FM */
+ bne no_32x_vdp
+ move.w #(safe_addrs_end_32x_vdp - safe_addrs)/8-1,d2
+no_32x_vdp:
+no_32x:
+
0:
move.l (a1)+,d0
cmp.l d0,d1
addq.l #4,a1
dbra d2,0b
-addr_unsafe:
move.l d1,a1
- moveq.l #0,d0
+
+ moveq.l #0x0c,d0
+ cmp.l #0xa14000,d1
+ beq gsm_rts
+
+ moveq.l #0x08,d0
+ cmp.l #0xa14100,d1
+ beq gsm_rts
+
+ /* check for VDP address */
+ move.l d1,d0
+ swap d0
+ and.b #0xe0,d0
+ cmp.b #0xc0,d0
+ bne addr_unsafe /* not vdp */
+
+ move.l d1,d0
+ and.l #0x0700e0,d0
+ bne addr_unsafe
+
+ move.l d1,d0
+ and.b #0x1f,d0
+ cmp.b #0x04,d0
+ blt addr_hsafe_3 /* data port */
+ cmp.b #0x10,d0
+ blt addr_safe /* below PSG */
+ cmp.b #0x18,d0
+ bge addr_safe /* above PSG */
+
+addr_unsafe:
+ moveq.l #0,d0 /* skip line */
+ rts
+
+addr_hsafe_3:
+ moveq.l #3,d0 /* skip 2 words */
rts
addr_safe:
move.l d1,a1
- moveq.l #1,d0
+ moveq.l #0xf,d0
+gsm_rts:
rts
move.w d1,d0
rts
-# Load tile data from ROM
-# a0: VRAM base
-# a1: pattern address
-# d0: number of tiles to load
-# destroys d1
-
-load_tiles:
- move.l d0,d1
- VRAM_ADDR_var a0
- move.l d0,(GFXCNTL).l
-
- move.l #GFXDATA,a0
- lsl.w #3,d1
- subq.l #1,d1
-0:
- move.l (a1)+,(a0)
- dbra d1,0b
-
- rts
-
-
# Prepare to write to VDP RAM @a0
# sets a0 to VDP data port for convenience
# a0: VRAM base
beq _print_end
move.w d0,(a0)
- jmp _print_loop
+ bra _print_loop
_print_end:
rts
rts
-#################################################
-# #
-# Wait for next VBlank interrupt #
-# #
-#################################################
+# wait vertical sync interrupt
wait_vsync:
move.b d7,d0
rts
+# wait vsync start (polling)
+# destroys a0,d0
+
+wait_vsync_poll:
+ move.l #GFXCNTL,a0
+0:
+ move.w (a0),d0
+ and.b #8,d0
+ nop
+ nop
+ bne 0b
+0:
+ move.w (a0),d0
+ and.b #8,d0
+ nop
+ nop
+ beq 0b
+ rts
+
+
+test_code:
+ nop
+
+test_code_ret_op:
+ jmp 0x123456 /* will be patched */
+test_code_end:
+
#################################################
# #
# RAM DATA #