X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=megaed-sv%2Fasmtools.s;h=dc75b6ca8b1fec398f516c2ee7093009eb4099aa;hb=a0ae101496c7d5c25ef0e14f8f8852183c1a10f3;hp=2ed3df71b017d0105f92d135c694a3eb9251b4da;hpb=eea25dd137e6a818db0a31e35cd57090c47dff08;p=megadrive.git diff --git a/megaed-sv/asmtools.s b/megaed-sv/asmtools.s index 2ed3df7..dc75b6c 100644 --- a/megaed-sv/asmtools.s +++ b/megaed-sv/asmtools.s @@ -236,116 +236,179 @@ test_byte_write: .global run_game /* u16 mapper, int tas_sync */ run_game: - move.w #0x2700, sr + move.w #0x2700, sr ldarg 0, 0, d7 ldarg 1, 0, d6 movea.l #0xa10000, a6 movea.l #0xc00000, a5 movea.l #0xc00005, a4 movea.l #0xc00004, a3 - moveq.l #0x00, d2 - move.b #0xff, d3 - move.b #0x40, d4 - move.b d4, (0x09,a6) /* CtrlA */ - move.b d2, (0x0b,a6) /* CtrlB */ - move.b d2, (0x0d,a6) /* CtrlC */ - move.b d2, (0x13,a6) /* S-CtrlA */ + moveq.l #0x00, d0 + move.b #0x40, d1 /* d2 is tmp */ + move.b #0xff, d3 /* d4 is temp */ + moveq.l #0x00, d5 /* progress cnt */ + movea.l d0, a7 + move.b d1, (0x09,a6) /* CtrlA */ + move.b d0, (0x0b,a6) /* CtrlB */ + move.b d0, (0x0d,a6) /* CtrlC */ + move.b d0, (0x13,a6) /* S-CtrlA */ move.b d3, (0x0f,a6) /* TxDataA */ - move.b d2, (0x19,a6) /* S-CtrlB */ + move.b d0, (0x19,a6) /* S-CtrlB */ move.b d3, (0x15,a6) /* TxDataB */ - move.b d2, (0x1f,a6) /* S-CtrlC */ + move.b d0, (0x1f,a6) /* S-CtrlC */ move.b d3, (0x1b,a6) /* TxDataC */ - /* set up for vram write */ - move.l #0x40000000, (a3) + move.w #0xcbaf, (0xA13006) /* some scratch area */ move.l #0xff0000, a1 - move.l #0x10000/4/4-1, d0 + move.l #0x10000/4/4-1, d2 0: - move.l d2, (a1)+ - move.l d2, (a1)+ - move.l d2, (a1)+ - move.l d2, (a1)+ - dbra d0, 0b - - move.l #0xfffe00, a1 - tst.l d6 - bne use_tas_code + move.l d0, (a1)+ + move.l d0, (a1)+ + move.l d0, (a1)+ + move.l d0, (a1)+ + dbra d2, 0b lea (run_game_r,pc), a0 - move.l #(run_game_r_end - run_game_r)/2-1, d0 - bra 0f -use_tas_code: - lea (run_game_r_tas,pc), a0 - move.l #(run_game_r_tas_end - run_game_r_tas)/2-1, d0 - + move.l #0xffff80, a1 + move.l #(run_game_r_end - run_game_r)/2-1, d2 0: move.w (a0)+, (a1)+ - dbra d0, 0b - jmp 0xfffe00 - -run_game_r: - move.w #0x3210, (0xA13006) - - move.w d7, (0xA13010) - move.w #0, (0xA13000) - - move.l (0x00), a7 - move.l (0x04), a0 - jmp (a0) -run_game_r_end: - -run_game_r_tas: - move.w #0x3210, (0xA13006) - move.w d7, (0xA13010) - move.w #0, (0xA13000) - - move.l (0x00), a7 - move.l (0x04), a0 + dbra d2, 0b -0: /* wait for special code */ - move.b d4, (0x03,a6) - move.b (0x03,a6), d0 - move.b d2, (0x03,a6) - move.b (0x03,a6), d1 - and.b #0x3f, d0 - cmp.b d0, d1 - bne 0b - cmp.b #0x25, d0 - bne 0b + tst.l d6 + beq.s sync_hvc -0: /* wait for special code to end */ - cmp.b (0x03,a6), d0 - beq 0b + movea.l #0xa10003, a0 + bsr sync_with_teensy /* trashes d3 */ + move.l d0, (-4,a7) + +sync_hvc: + addq.l #1, d6 /* attempt counter */ + + /* set up for progress vram write (x,y - tile #) */ + /* GFX_WRITE_VRAM_ADDR(0xc000 + (x + 64 * y) * 2) */ + /* d = d5 + '0' - 32 + 0xB000/32 - 128 = d5 + 0x510 */ + move.l #(0x40000003 | ((36 + 64*1) << 17)), (a3) + add.w #0x510, d5 + move.w d5, (a5) + move.w #('/'+0x4e0), (a5) + move.w #('4'+0x4e0), (a5) + + lea hexchars, a1 + move.l #(0x40000003 | ((31 + 64*2) << 17)), (a3) + moveq.l #8-1, d5 +0: + rol.l #4, d3 + move.b d3, d4 + and.l #0x0f, d4 + move.b (d4,a1), d4 + add.w #0x4e0, d4 + move.w d4, (a5) + dbra d5, 0b + + movea.l #0xc00008, a0 + movea.l #0x3ff000, a1 + movea.l #0xffffe0, a2 /* wait for active display */ - moveq.l #3, d0 + moveq.l #3, d2 0: - btst d0, (a4) /* 8 */ + btst d2, (a4) /* 8 */ beq.s 0b /* 10 */ 0: - btst d0, (a4) + btst d2, (a4) bne.s 0b /* flood the VDP FIFO */ .rept 5 - move.w d2, (a5) + move.w d0, (a5) .endr - /* doesn't help.. */ -.if 0 -.rept 94 - nop -.endr - move.l #0x93049400, (a3) /* DMALEN LO/HI = 0x0008 */ - move.l #0x95009601, (a3) /* DMA SRC LO/MID */ - move.l #0x977f8114, (a3) /* DMA SRC HI/MODE, Turn off Display */ - move.l #0xc0000080, (a3) /* start DMA */ -.endif + /* these seem stable for both 50Hz/60Hz */ + move.l (a0), (a1)+ /* #0xff07ff09 */ + move.l (a0), (a1)+ /* #0xff00ff11 */ + move.l (a0), (a1)+ /* #0xff18ff1a */ + move.l (a0), (a1)+ /* #0xff21ff23 */ + move.l (a0), (a1)+ /* #0xff2aff28 */ + move.l (a0), (a1)+ /* #0xff33ff34 */ + move.l (a0), (a1)+ /* #0xff3cff3e */ + move.l (a0), (a1)+ /* #0xff45ff47 */ + + /* as long as exactly 8 or more RAM writes are performed here, */ + /* after multiple tries RAM refresh somehow eventually syncs */ + /* after cold boot, only 50Hz syncs to always same values though, */ + /* so values below are 50Hz */ + move.l (a0), (a2)+ /* #0xff4eff4f */ + move.l (a0), (a2)+ /* #0xff58ff59 */ + move.l (a0), (a2)+ /* #0xff60ff62 */ + move.l (a0), (a2)+ /* #0xff69ff6b */ + move.l (a0), (a2)+ /* #0xff72ff74 */ + move.l (a0), (a2)+ /* #0xff7bff7c */ + move.l (a0), (a2)+ /* #0xff83ff85 */ + move.l (a0), (a2)+ /* #0xff8eff8f */ + + sub.l #4*8, a1 + sub.l #4*8, a2 + + moveq.l #1, d5 + move.l (0x00,a1), d3 + cmp.l #0xff07ff09, d3 + bne.w sync_hvc + + moveq.l #2, d5 + move.l (0x04,a1), d3 + cmp.l #0xff00ff11, d3 /* mystery value */ + bne.w sync_hvc + + moveq.l #3, d5 + move.l (0x1c,a1), d3 + cmp.l #0xff45ff47, d3 + bne.w sync_hvc + + btst.b #6, (0xa10001) + bne.s sync_hvc_50hz + +sync_hvc_60hz: + /* unable to get stable RAM between cold boots :( */ + moveq.l #4, d5 + move.l (0x1c,a2), d3 + cmp.l #0xff8dff8f, d3 /* unstable */ + beq.s sync_hvc_end + cmp.l #0xff8cff8e, d3 /* stable? */ + beq.s sync_hvc_end + cmp.l #0xff8eff90, d3 + beq.s sync_hvc_end + bra.w sync_hvc + +sync_hvc_50hz: + moveq.l #4, d5 + move.l (0x1c,a2), d3 + cmp.l #0xff8eff8f, d3 /* RAM */ + bne.w sync_hvc + +sync_hvc_end: + movea.l d0, a0 + movea.l #0xA13000, a1 + + move.b d0, (0x09,a6) /* CtrlA */ + move.b d1, (0x03,a6) + + jmp 0xffff80 + +run_game_r: + move.w #0x3210, (0x06,a1) /* 0xA13006 */ + move.w d7, (0x10,a1) /* 0xA13010 */ + move.w d0, (a1) /* 0xA13000 */ + + move.l (a0)+, a7 + move.l (a0), a0 - move.b d2, (0x09,a6) /* CtrlA */ - move.b d4, (0x03,a6) jmp (a0) -run_game_r_tas_end: +run_game_r_end: + +hexchars: + dc.b '0','1','2','3','4','5','6','7' + dc.b '8','9','a','b','c','d','e','f' # vim:filetype=asmM68k:ts=4:sw=4:expandtab