###############################################################################
#
-# Copyright (c) 2009, Gražvydas Ignotas
+# Copyright (c) 2009,2011 Gražvydas Ignotas
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# 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 ''AS IS'' AND ANY
+# 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 <copyright holder> BE LIABLE FOR ANY
+# 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
.globl main
.globl INT
.globl VBL
+.globl return_to_main
##################################################
# #
.equ MMODE_START_MENU, 4
.equ MMODE_GOTO_PREDEF, 5
.equ MMODE_JMP_ADDR, 6
-.equ MMODE_DUMP, 7
+.equ MMODE_PC, 7
.equ predef_addr_cnt, ((predef_addrs_end-predef_addrs)/4)
.macro do_dpad bit op val
btst.l #\bit,d0
beq 0f
- \op.l \val,a6
+ \op \val,a6
bra dpad_end
0:
.endm
predef_addrs:
dc.l 0x000000, 0x200000, 0x400000, 0xa00000, 0xa10000
- dc.l 0xa11100, 0xa12000, 0xa13000, 0xa14000, 0xc00000
+ dc.l 0xa11100, 0xa12000, 0xa13000, 0xa14000, 0xa15100
+ dc.l 0xc00000
predef_addrs_end:
safe_addrs:
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:
-transfer_mode:
- dc.l 0x000000 /* 1 for recv */
-transfer_addr:
- dc.l 0x000000
-transfer_len:
- dc.l 0x000800
+sizeof_bin:
+ dc.l _edata
txt_edit:
.ascii "- edit -\0"
txt_jmp_addr:
.ascii "Jump to address\0"
txt_dump:
- .ascii "Transfer\0"
+ .ascii "PC Transfer\0"
txt_dtack:
.ascii "DTACK safety\0"
-txt_ready_send:
- .ascii "Ready to send\0"
-txt_ready_recv:
- .ascii "Ready to recv\0"
+txt_transfer_ready:
+ .ascii "Transfer Ready\0"
txt_working:
- .ascii "Working.. \0"
+ .ascii "PC mode \0"
txt_dtack_err:
.ascii "DTACK err?\0"
txt_exc:
.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
+
+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 */
bne 0f
move.l #0,a0
- move.w #0x2000/8-1,d0
+ move.l (sizeof_bin,pc),d0
+ lsr.l #3,d0
1:
move.l (a0)+,(a1)+
move.l (a0)+,(a1)+
/* copy, assume 8K size */
move.l #0xFF0100,a1
- move.w #0x2000/8-1,d0
+ move.l (sizeof_bin,pc),d0
+ lsr.l #3,d0
1:
move.l (a0)+,(a1)+
move.l (a0)+,(a1)+
addq.b #1,d7
# 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
lea (jumptab,pc,d0),a0
jmp (a0)
jumptab:
+ /* 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 */
btst.l #16+4,d0 /* A - scroll modifier */
beq input_noa
- do_dpad 16+0, sub, #0x0800
- do_dpad 16+1, add, #0x0800
- do_dpad 16+10, sub, #0xd800
- do_dpad 16+11, add, #0xd800
+ do_dpad 16+0, sub.l, #0x0800
+ do_dpad 16+1, add.l, #0x0800
+ do_dpad 16+10, sub.l, #0xd800
+ do_dpad 16+11, add.l, #0xd800
input_noa:
moveq.l #0,d1
move.w d7,d1
lsr.w #7,d1
lsr.w #7,d1
- do_dpad 0, subq, #0x0008
- do_dpad 1, addq, #0x0008
- do_dpad 10, sub, d1
- do_dpad 11, add, d1
+ do_dpad 0, subq.l, #0x0008
+ do_dpad 1, addq.l, #0x0008
+ do_dpad 10, sub.l, d1
+ do_dpad 11, add.l, d1
dpad_end:
/* update addr */
0:
cmp.b #3,d1
bne 0f
- change_mode MMODE_DUMP, MMODE_MAIN
+ change_mode MMODE_PC, MMODE_MAIN
bsr start_menu_box
bra vbl_end
0:
move.l d5,a0
jmp (a0)
-################### transfer #####################
-
mode_transfer:
- move.b #0x40,(0xa1000b).l
- move.b #0x40,(0xa10005).l
+ move.b #0x40,(0xa1000b).l /* port 2 ctrl */
+ move.b #0x00,(0xa10005).l /* port 2 data - start with TH low */
- move.l (transfer_mode,pc),d0
- tst.l d0
- bne 0f
- lea (txt_ready_send,pc),a0
- bra 1f
-0:
- lea (txt_ready_recv,pc),a0
-1:
+ lea (txt_transfer_ready,pc),a0
move.l #13,d0
move.l #13,d1
move.l #0x8000,d2
bne wait_tl_low0
menu_text txt_working, 13, 13, 0
-
- lea 0xa10005,a1
- move.l (transfer_addr,pc),a0
- move.l (transfer_len,pc),d2
-
- move.l (transfer_mode,pc),d0
- tst.l d0
- bne transfer_recv
-
-transfer_send:
- move.b #0x4f,(0xa1000b).l
-
-tr_send_loop:
- move.b (a0),d1
- and.b #0x0f,d1
-
-wait_tl_low1:
- move.b (a1),d0
- btst.b #4,d0
- bne wait_tl_low1
-
- move.b d1,(a1) /* clears TH and writes data */
-
- move.b (a0)+,d1
- lsr.b #4,d1
- bset.b #6,d1 /* prepare TH */
-
-wait_tl_hi1:
- move.b (a1),d0
- btst.b #4,d0
- beq wait_tl_hi1
-
- move.b d1,(a1)
- subq.l #1,d2
- bne tr_send_loop
-
- move.b #0,(0xa1000b).l
- bra return_to_main
-
-transfer_recv:
- move.b #0,(a1) /* clear TH */
-
-tr_recv_loop:
-wait_tl_low2:
- move.b (a1),d0
- btst.b #4,d0
- bne wait_tl_low2
-
- move.b #0x40,(a1) /* set TH */
- move.b d0,d1
- and.b #0x0f,d1
-
-wait_tl_hi2:
- move.b (a1),d0
- btst.b #4,d0
- beq wait_tl_hi2
-
- move.b #0,(a1) /* clear TH */
- lsl.b #4,d0
- or.b d0,d1
- move.b d1,(a0)+
-
- subq.l #1,d2
- bne tr_recv_loop
-
- move.b #0,(0xa1000b).l
+ bsr do_transfer
bra return_to_main
-
# go back to main mode
return_to_main:
bclr.l #7,d6 /* not edited */
lsr.l #8,d1
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
notaz.gp2x.de / megadrive.git / blobdiff