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gbemu_xt.inc
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/************************************************************************
* gbemu_xt.inc
* Emulation of the Gameboy CPU
* (Extensions)
*
************************************************************************
*
* Phoinix,
* Nintendo Gameboy(TM) emulator for the Palm OS(R) Computing Platform
*
* (c)2000-2007 Bodo Wenzel
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
************************************************************************
* History:
*
* $Log: gbemu_xt.inc,v $
* Revision 1.8 2007/02/25 13:15:51 bodowenzel
* Correct interrupt priorities
*
* Revision 1.7 2006/10/23 15:38:53 bodowenzel
* Support for Rana
*
* Revision 1.6 2005/05/03 08:39:11 bodowenzel
* Moved coldReset, ime, im and error into EmulationCpuState
*
* Revision 1.5 2005/02/27 16:38:24 bodowenzel
* Added module Eggs for easter eggs
*
* Revision 1.4 2005/01/30 19:34:07 bodowenzel
* Added labels for all combo parts
*
* Revision 1.3 2002/10/19 08:08:11 bodowenzel
* History cleanup, Javadoc-style header
*
* Revision 1.2 2001/12/30 18:47:11 bodowenzel
* CVS keyword Log was faulty
*
* Revision 1.1.1.1 2001/12/16 13:38:52 bodowenzel
* Import
*
************************************************************************
* Pre-CVS History (developed as PalmBoy):
*
* 2001-09-22 Bodo Wenzel Some optimization
* 2001-09-16 Bodo Wenzel Saving states now possible
* 2001-07-21 Bodo Wenzel Changed syntax to CPP + GAS
* 2001-02-04 Bodo Wenzel New stack management
* 2001-01-30 Bodo Wenzel Support of more cartridges
* 2000-12-02 Bodo Wenzel HALT with DI support
* 2000-11-16 Bodo Wenzel New screen rendering and
* better joypad emulation
* 2000-10-22 Bodo Wenzel Interrupts and timer
* 2000-09-29 Bodo Wenzel PalmBoy-Scroller as GB code
* 2000-09-27 Bodo Wenzel DAA implemented
* 2000-09-09 Bodo Wenzel Now realy full screen emulation
* 2000-06-06 Bodo Wenzel New memory management
* 2000-05-06 Bodo Wenzel External RAM pageable
* 2000-04-29 Bodo Wenzel Creation
************************************************************************
*/
/* === Space for a small hidden game ;-) ============================== */
#include "hidden.inc"
/* === Miscellaneous support ========================================== */
.macro xt_58 /* stop opcode */
xt_58:
jmp 0.l
.endm
.macro xt_59 /* return to emulation caller */
xt_59:
xt_return:
rts /* centralized to support debuggers */
.endm
/* === Interrupt support ============================================== */
/* the following routine has to be here because of the used macros */
.macro xt_5a /* check for pending interrupts */
xt_5a:
xt_check_int:
move.b [email protected](%a5),%d0
and.b [email protected](%a5),%d0
jne goon\@
rts
goon\@: moveq #0x0040,%d1
moveq #4,%d2
loop\@: lsr.b #1,%d0
jcs xt_ci1
addq.w #0x0008,%d1
dbra %d2,loop\@
rts
.endm
.macro xt_5b /* call interrupt (part 1) */
xt_5b:
xt_ci1: neg.b %d2
addq.b #4,%d2
bclr %d2,[email protected](%a5)
addq.w #4,%sp
do_push %a0
jra xt_ci2
.endm
.macro xt_5c /* call interrupt (part 2) */
xt_5c:
xt_ci2: moveq #0,%d0
move.b %d0,[email protected](%a5)
move.b %d0,[email protected](%a5)
move.l [email protected](%a5),%a0
move.l %a0,[email protected](%a5)
add.w %d1,%a0
next_pc
.endm
/* === Memory vectors ================================================= */
.macro xt_5d /* RAM enable */
xt_5d:
jmp 0.l
.endm
.macro xt_5e /* ROM bank (low) selection */
xt_5e:
jmp 0.l
.endm
.macro xt_5f /* ROM bank (high) selection */
xt_5f:
jmp 0.l
.endm
.macro xt_60 /* RAM bank selection */
xt_60:
jmp 0.l
.endm
.macro xt_61 /* ROM/RAM mode selection */
xt_61:
jmp 0.l
.endm
.macro xt_62 /* write to tile tab 0x8000..0x87ff */
xt_62:
jmp 0.l
.endm
.macro xt_63 /* write to tile tab 0x8800..0x8fff */
xt_63:
jmp 0.l
.endm
.macro xt_64 /* write to tile tab 0x9000..0x97ff */
xt_64:
jmp 0.l
.endm
.macro xt_65 /* write to screen 0x9800..0x9bff */
xt_65:
jmp 0.l
.endm
.macro xt_66 /* write to screen 0x9c00..0x9fff */
xt_66:
jmp 0.l
.endm
.macro xt_67 /* read from external RAM 0xa000..0xbfff */
xt_67:
jmp 0.l
.long 0
.endm
.macro xt_68 /* write to external RAM 0xa000..0xbfff */
xt_68:
jmp 0.l
.long 0
.endm
.macro xt_69 /* write to OAM 0xfe00..0xfeff */
xt_69:
jmp 0.l
.endm
/* === LCD vectors ==================================================== */
.macro xt_6a /* support for LCD line */
xt_6a:
xt_lcd_line:
jmp 0.l
.endm
.macro xt_6b /* write to DMA */
xt_6b:
jmp 0.l
.endm
/* === Memory support ================================================= */
/* the following routine has to be here because it is used in macros */
.macro xt_6c /* SP push correction */
xt_6c:
movem.l %d0-%d2/%a2-%a3,-(%sp)
move.b [email protected](%a5),%d1
subq.b #1,[email protected](%a5)
mem_rd [email protected](%a5)
move.l %a2,[email protected](%a5)
lea 2(%a3),%a1
movem.l (%sp)+,%d0-%d2/%a2-%a3
rts
.endm
/* the following routine has to be here because it is used in macros */
.macro xt_6d /* SP pop correction */
xt_6d:
movem.l %d0-%d2/%a2-%a3,-(%sp)
move.b [email protected](%a5),%d1
addq.b #1,[email protected](%a5)
mem_rd [email protected](%a5)
move.l %a2,[email protected](%a5)
move.l %a3,%a1
movem.l (%sp)+,%d0-%d2/%a2-%a3
rts
.endm
/* the following routine has to be here because it is used in macros */
.macro xt_6e /* SP ROM bank correction */
xt_6e:
move.w [email protected](%a5),%d1
jmi goon\@
cmp.w #0x4000,%d1
jcs goon\@
move.l [email protected](%a5),%a1
move.l %a1,[email protected](%a5)
add.w %d1,%a1
goon\@: jmp (%a6)
.endm
/* the following routine has to be here because it is used in macros */
.macro xt_6f /* SP RAM bank correction */
xt_6f:
move.w [email protected](%a5),%d1
cmp.w #0xc000,%d1
jcc goon\@
cmp.w #0xa000,%d1
jcs goon\@
move.l [email protected](%a5),%a1
move.l %a1,[email protected](%a5)
add.w %d1,%a1
goon\@: jmp (%a6)
.endm
/* === GB code for startup ============================================ */
.macro xt_70 /* check for restart, set all I/O registers (part 1) */
xt_70: /* reset: ;at 0x0000 */
.byte 0xa7 /* and a */
.byte 0xca,0x00,0x0c /* jp z,continue */
/* */
.byte 0x3e,0xff /* ld a,0xff */
.byte 0xe0,0x00 /* ldh (P1),a */
.byte 0x3e,0x00 /* ld a,0x00 */
.byte 0xe0,0x05 /* ldh (TIMA),a */
.byte 0x3e,0x00 /* ld a,0x00 */
.byte 0xe0,0x06 /* ldh (TMA),a */
.byte 0x3e,0x00 /* ld a,0x00 */
.byte 0xe0,0x07 /* ldh (TAC),a */
.byte 0x3e,0x80 /* ld a,0x80 */
.byte 0xe0,0x10 /* ldh (NR10),a */
.byte 0x3e,0xbf /* ld a,0xbf */
.byte 0xe0,0x11 /* ldh (NR11),a */
.byte 0x3e,0xf3 /* ld a,0xf3 */
.byte 0xe0,0x12 /* ldh (NR12),a */
.byte 0x3e,0xbf /* ld a,0xbf */
.byte 0xe0,0x14 /* ldh (NR14),a */
.byte 0x3e,0x3f /* ld a,0x3f */
.byte 0xe0,0x16 /* ldh (NR21),a */
.byte 0x3e,0x00 /* ld a,0x00 */
.byte 0xe0,0x17 /* ldh (NR22),a */
/* */
.byte 0xc3,0x00,0x01 /* jp reset1 */
.endm
.macro xt_71 /* set all I/O registers (part 2) */
xt_71: /* reset1: */
.byte 0x3e,0xbf /* ld a,0xbf */
.byte 0xe0,0x19 /* ldh (NR24),a */
.byte 0x3e,0x7f /* ld a,0x7f */
.byte 0xe0,0x1a /* ldh (NR30),a */
.byte 0x3e,0xff /* ld a,0xff */
.byte 0xe0,0x1b /* ldh (NR31),a */
.byte 0x3e,0x9f /* ld a,0x9f */
.byte 0xe0,0x1c /* ldh (NR32),a */
.byte 0x3e,0xbf /* ld a,0xbf */
.byte 0xe0,0x1e /* ldh (NR33),a */
.byte 0x3e,0xff /* ld a,0xff */
.byte 0xe0,0x20 /* ldh (NR41),a */
.byte 0x3e,0x00 /* ld a,0x00 */
.byte 0xe0,0x21 /* ldh (NR42),a */
.byte 0x3e,0x00 /* ld a,0x00 */
.byte 0xe0,0x22 /* ldh (NR43),a */
.byte 0x3e,0xbf /* ld a,0xbf */
.byte 0xe0,0x23 /* ldh (NR44),a */
.byte 0x3e,0x77 /* ld a,0x77 */
.byte 0xe0,0x24 /* ldh (NR50),a */
.byte 0x3e,0xf3 /* ld a,0xf3 */
.byte 0xe0,0x25 /* ldh (NR51),a */
/* */
.byte 0xc3,0x00,0x02 /* jp reset2 */
.endm
.macro xt_72 /* set all I/O registers (part 3) */
xt_72: /* reset2: */
.byte 0x3e,0xf1 /* ld a,0xf1 */
.byte 0xe0,0x26 /* ldh (NR52),a */
/* */
.byte 0xaf /* xor a */
.byte 0xe0,0x40 /* ldh (LCDC),a */
.byte 0x3e,0x00 /* ld a,0x00 */
.byte 0xe0,0x41 /* ldh (STAT),a */
.byte 0x3e,0x00 /* ld a,0x00 */
.byte 0xe0,0x42 /* ldh (SCY),a */
.byte 0x3e,0x00 /* ld a,0x00 */
.byte 0xe0,0x43 /* ldh (SCX),a */
.byte 0x3e,0x00 /* ld a,0x00 */
.byte 0xe0,0x45 /* ldh (LYC),a */
.byte 0x3e,0xfc /* ld a,0xfc */
.byte 0xe0,0x47 /* ldh (BGP),a */
.byte 0x3e,0xff /* ld a,0xff */
.byte 0xe0,0x48 /* ldh (OBP0),a */
.byte 0x3e,0xff /* ld a,0xff */
.byte 0xe0,0x49 /* ldh (OBP1),a */
.byte 0x3e,0x00 /* ld a,0x00 */
.byte 0xe0,0x4a /* ldh (WY),a */
.byte 0x3e,0x00 /* ld a,0x00 */
.byte 0xe0,0x4b /* ldh (WX),a */
/* */
.byte 0xc3,0x00,0x03 /* jp reset3 */
.endm
.macro xt_73 /* set all I/O registers (part 4), scroller (part 1) */
xt_73: /* reset3: */
.byte 0x3e,0x91 /* ld a,0x91 */
.byte 0xe0,0x40 /* ldh (LCDC),a */
.byte 0x3e,0x00 /* ld a,0x00 */
.byte 0xe0,0xff /* ldh (IE),a */
/* */
.byte 0x21,0x00,0x98 /* ld hl,0x9800 */
/* resetloop1: */
.byte 0x7e /* ld a,(hl) */
.byte 0x2f /* cpl */
.byte 0x22 /* ld (hli),a */
.byte 0x7c /* ld a,h */
.byte 0xfe,0xa0 /* cp 0xa0 */
.byte 0x20,0xf8 /* jr nz,resetloop1 */
/* */
.byte 0x31,0xfe,0xff /* ld sp,0xfffe */
/* */
.byte 0x3e,0x50 /* ld a,144/2+8 */
.byte 0xa3 /* and e */
.byte 0x3c /* inc a */
.byte 0xe0,0x42 /* ld (SCY),a */
/* */
.byte 0x21,0x00,0x81 /* ld hl,0x8100 */
.byte 0x11,0x00,0x07 /* ld de,tiletab+0x000*/
.byte 0xcd,0x00,0x06 /* call copydehl */
.byte 0x11,0x00,0x08 /* ld de,tiletab+0x100*/
.byte 0xcd,0x00,0x06 /* call copydehl */
/* */
.byte 0xc3,0x00,0x04 /* jp reset4 */
.endm
.macro xt_74 /* scroller (part 2) */
xt_74: /* reset4: */
.byte 0x11,0x00,0x09 /* ld de,tiletab+0x200*/
.byte 0xcd,0x00,0x06 /* call copydehl */
.byte 0x11,0x00,0x0a /* ld de,tiletab+0x300*/
.byte 0xcd,0x00,0x06 /* call copydehl */
.byte 0x11,0x00,0x0b /* ld de,tiletab+0x400*/
.byte 0xcd,0x00,0x06 /* call copydehl */
/* */
.byte 0x3e,0x10 /* ld a,0x10 */
.byte 0x21,0x04,0x99 /* ld hl,0x9800+8*32+10*/
.byte 0x06,0x0c /* ld b,12 */
/* resetloop2: */
.byte 0x22 /* ld (hli),a */
.byte 0x3c /* inc a */
.byte 0x05 /* dec b */
.byte 0x20,0xfb /* jr nz,resetloop2 */
.byte 0x21,0x24,0x99 /* ld hl,0x9800+9*32+10*/
.byte 0x06,0x0c /* ld b,12 */
/* resetloop3: */
.byte 0x22 /* ld (hli),a */
.byte 0x3c /* inc a */
.byte 0x05 /* dec b */
.byte 0x20,0xfb /* jr nz,resetloop3 */
.byte 0x21,0x10,0x99 /* ld hl,0x9800+8*32+22*/
.byte 0x77 /* ld (hl),a */
/* */
.byte 0xc3,0x00,0x05 /* jp reset5 */
.endm
.macro xt_75 /* scroller (part 3), set registers */
xt_75: /* reset5: */
.byte 0x21,0x42,0xff /* ld hl,SCY */
/* resetwait1: */
.byte 0xf0,0x44 /* ldh a,(LY) */
.byte 0xfe,0x90 /* cp 144 */
.byte 0x28,0xfa /* jr z,resetwait1 */
/* resetwait2: */
.byte 0xf0,0x44 /* ldh a,(LY) */
.byte 0xfe,0x90 /* cp 144 */
.byte 0x20,0xfa /* jr nz,resetwait2 */
.byte 0x35 /* dec (hl) */
.byte 0x20,0xf1 /* jr nz,resetwait1 */
/* */
.byte 0x01,0x13,0x00 /* ld bc,0x0013 */
.byte 0x11,0xd8,0x00 /* ld de,0x00d8 */
.byte 0x21,0x4d,0x01 /* ld hl,0x014d */
.byte 0x3e,0x03 /* ld a,0x03 */
.byte 0xcb,0x3f /* srl a ;af=0x01b0*/
/* */
.byte 0xdb /* (illegal for stop) */
.endm
.macro xt_76 /* copy subroutine for tile table */
xt_76: /* copydehl: ;at 0x0600 */
.byte 0x06,0x28 /* ld b,40 */
/* copydehlloop: */
.byte 0x1a /* ld a,(de) */
.byte 0x13 /* inc de */
.byte 0x22 /* ldi (hl),a */
.byte 0x22 /* ldi (hl),a */
.byte 0x05 /* dec b */
.byte 0x20,0xf9 /* jr nz,copydehlloop */
/* */
.byte 0xc9 /* ret */
.endm
.macro xt_77
xt_77:
/* tiletab: */
.byte 0x1f,0x1f,0x18,0x18,0x30,0x30,0x3f,0x3f
.byte 0xc0,0xe0,0x70,0x30,0x30,0x70,0xe0,0x80
.byte 0x60,0x60,0x60,0x60,0xc0,0xc0,0xc0,0xff
.byte 0x60,0x60,0x60,0x60,0xc1,0xc1,0xc3,0xc3
.byte 0x0e,0x3f,0x71,0xc0,0x80,0x80,0x00,0x00
.endm
.macro xt_78
xt_78:
.byte 0x00,0x80,0xc0,0xc0,0x60,0x60,0x60,0x60
.byte 0x60,0x60,0x60,0x60,0xc1,0xc1,0xc1,0xc1
.byte 0xc0,0xc0,0xe0,0xe0,0xb0,0xb0,0x98,0x98
.byte 0x60,0x60,0x60,0x60,0xc1,0xc1,0xc1,0xc1
.byte 0xc3,0xc1,0xc1,0xc0,0x80,0x80,0x80,0x80
.endm
.macro xt_79
xt_79:
.byte 0x80,0x80,0xc0,0xc1,0xe3,0x67,0x7e,0x3c
.byte 0x38,0x70,0xe1,0xc1,0x81,0x01,0x00,0x00
.byte 0x60,0x60,0x60,0x60,0xc0,0xc0,0xc0,0xc0
.byte 0x01,0x01,0x01,0x01,0x03,0x03,0x03,0x03
.byte 0xff,0x81,0x81,0x81,0x03,0x03,0x03,0x03
.endm
.macro xt_7a
xt_7a:
.byte 0x83,0x83,0x83,0x83,0x01,0x01,0x00,0x00
.byte 0x00,0x00,0x00,0x00,0x81,0xc7,0xfe,0x38
.byte 0x61,0x61,0xc1,0xc1,0x83,0x03,0x03,0x03
.byte 0x83,0x83,0x83,0x83,0x06,0x06,0x06,0x06
.byte 0x0d,0x0d,0x07,0x07,0x03,0x03,0x03,0x03
.endm
.macro xt_7b
xt_7b:
.byte 0x83,0x83,0x83,0x83,0x06,0x06,0x06,0x06
.byte 0x00,0x00,0x00,0x01,0x03,0x07,0x0e,0x1c
.byte 0x38,0x78,0xfc,0xcc,0x8e,0x06,0x07,0x03
.byte 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80
.byte 0x7c,0x82,0x7d,0x11,0x39,0x11,0x82,0x7c
.endm
.macro xt_7c /* set relevant I/O registers (part 1) */
xt_7c: /* continue: ;at 0c00 */
.byte 0x78 /* ld a,b */
.byte 0xe0,0x00 /* ldh (P1),a */
.byte 0xf0,0x07 /* ldh a,(TAC) */
.byte 0xe0,0x07 /* ldh (TAC),a */
.byte 0xaf /* xor a */
.byte 0xe0,0x40 /* ldh (LCDC),a */
.byte 0x79 /* ld a,c */
.byte 0xe0,0x41 /* ldh (STAT),a */
.byte 0xf0,0x42 /* ldh a,(SCY) */
.byte 0xe0,0x42 /* ldh (SCY),a */
.byte 0xf0,0x43 /* ldh a,(SCX) */
.byte 0xe0,0x43 /* ldh (SCX),a */
.byte 0xf0,0x45 /* ldh a,(LYC) */
.byte 0xe0,0x45 /* ldh (LYC),a */
.byte 0xf0,0x47 /* ldh a,(BGP) */
.byte 0x2f /* cpl */
.byte 0xe0,0x47 /* ldh (BGP),a */
.byte 0xf0,0x48 /* ldh a,(OBP0) */
.byte 0x2f /* cpl */
.byte 0xe0,0x48 /* ldh (OBP0),a */
.byte 0xf0,0x49 /* ldh a,(OBP1) */
.byte 0x2f /* cpl */
.byte 0xe0,0x49 /* ldh (OBP1),a */
.byte 0xf0,0x4a /* ldh a,(WY) */
.byte 0xe0,0x4a /* ldh (WY),a */
/* */
.byte 0xc3,0x00,0x0d /* jp continue2 */
.endm
.macro xt_7d /* set relevant I/O registers (part 2), set up tile map */
xt_7d: /* continue2: */
.byte 0xf0,0x4b /* ldh a,(WX) */
.byte 0xe0,0x4b /* ldh (WX),a */
.byte 0x7a /* ld a,d */
.byte 0xe0,0x40 /* ldh (LCDC),a */
.byte 0xf0,0xff /* ldh a,(IE) */
.byte 0xe0,0xff /* ldh (IE),a */
/* */
.byte 0x21,0x00,0x98 /* ld hl,0x9800 */
/* continueloop: */
.byte 0x7e /* ld a,(hl) */
.byte 0x2f /* cpl */
.byte 0x22 /* ld (hli),a */
.byte 0x7c /* ld a,h */
.byte 0xfe,0xa0 /* cp 0xa0 */
.byte 0x20,0xf8 /* jr nz,continueloop */
/* */
.byte 0xdb /* (illegal for stop) */
.endm
/* === GB code (start with PC and SP set up) ========================== */
.macro xt_7e /* restart gameboy */
xt_7e: /* restart: */
.byte 0x31,0xfe,0xff /* ld sp,xxxx */
.byte 0xc3,0x00,0x01 /* jp yyyy */
.endm
/* === Last chunk has to be empty! ==================================== */
.macro xt_7f
/* This macro will use the last bytes of the resource. But as
* resources have to be a bit smaller than 0x10000 bytes, it must
* be left empty!
*/
xt_7f:
.endm
/* === The end ======================================================== */