3 * (c) Copyright Dave, 2004
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4 * (C) notaz, 2006-2009
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6 * This work is licensed under the terms of MAME license.
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7 * See COPYING file in the top-level directory.
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10 #include "pico_int.h"
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11 #define NEED_DMA_SOURCE
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14 extern const unsigned char hcounts_32[];
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15 extern const unsigned char hcounts_40[];
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17 #ifndef UTYPES_DEFINED
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18 typedef unsigned char u8;
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19 typedef unsigned short u16;
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20 typedef unsigned int u32;
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21 #define UTYPES_DEFINED
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24 int (*PicoDmaHook)(unsigned int source, int len, unsigned short **base, unsigned int *mask) = NULL;
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26 static __inline void AutoIncrement(void)
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28 Pico.video.addr=(unsigned short)(Pico.video.addr+Pico.video.reg[0xf]);
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31 static NOINLINE void VideoWrite128(u32 a, u16 d)
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34 a = ((a & 2) >> 1) | ((a & 0x400) >> 9) | (a & 0x3FC) | ((a & 0x1F800) >> 1);
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35 ((u8 *)PicoMem.vram)[a] = d;
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38 static void VideoWrite(u16 d)
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40 unsigned int a = Pico.video.addr;
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42 switch (Pico.video.type)
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45 d = (u16)((d << 8) | (d >> 8));
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46 PicoMem.vram [(a >> 1) & 0x7fff] = d;
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47 if (a - ((unsigned)(Pico.video.reg[5]&0x7f) << 9) < 0x400)
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48 Pico.est.rendstatus |= PDRAW_DIRTY_SPRITES;
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50 case 3: Pico.m.dirtyPal = 1;
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51 PicoMem.cram [(a >> 1) & 0x3f] = d; break;
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52 case 5: PicoMem.vsram[(a >> 1) & 0x3f] = d; break;
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54 a |= Pico.video.addr_u << 16;
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55 VideoWrite128(a, d);
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57 //default:elprintf(EL_ANOMALY, "VDP write %04x with bad type %i", d, Pico.video.type); break;
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63 static unsigned int VideoRead(void)
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65 unsigned int a=0,d=0;
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67 a=Pico.video.addr; a>>=1;
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69 switch (Pico.video.type)
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71 case 0: d=PicoMem.vram [a & 0x7fff]; break;
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72 case 8: d=PicoMem.cram [a & 0x003f]; break;
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73 case 4: d=PicoMem.vsram[a & 0x003f]; break;
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74 default:elprintf(EL_ANOMALY, "VDP read with bad type %i", Pico.video.type); break;
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81 static int GetDmaLength(void)
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83 struct PicoVideo *pvid=&Pico.video;
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85 // 16-bit words to transfer:
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86 len =pvid->reg[0x13];
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87 len|=pvid->reg[0x14]<<8;
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88 len = ((len - 1) & 0xffff) + 1;
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92 static void DmaSlow(int len, unsigned int source)
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94 u32 inc = Pico.video.reg[0xf];
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95 u32 a = Pico.video.addr;
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96 u16 *r, *base = NULL;
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99 elprintf(EL_VDPDMA, "DmaSlow[%i] %06x->%04x len %i inc=%i blank %i [%u] @ %06x",
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100 Pico.video.type, source, a, len, inc, (Pico.video.status&8)||!(Pico.video.reg[1]&0x40),
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101 SekCyclesDone(), SekPc);
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103 Pico.m.dma_xfers += len;
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104 if (Pico.m.dma_xfers < len) // lame 16bit var
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105 Pico.m.dma_xfers = ~0;
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106 SekCyclesBurnRun(CheckDMA());
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108 if ((source & 0xe00000) == 0xe00000) { // Ram
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109 base = (u16 *)PicoMem.ram;
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112 else if (PicoAHW & PAHW_MCD)
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114 u8 r3 = Pico_mcd->s68k_regs[3];
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115 elprintf(EL_VDPDMA, "DmaSlow CD, r3=%02x", r3);
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116 if (source < 0x20000) { // Bios area
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117 base = (u16 *)Pico_mcd->bios;
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118 } else if ((source & 0xfc0000) == 0x200000) { // Word Ram
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119 if (!(r3 & 4)) { // 2M mode
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120 base = (u16 *)(Pico_mcd->word_ram2M + (source & 0x20000));
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122 if (source < 0x220000) { // 1M mode
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124 base = (u16 *)(Pico_mcd->word_ram1M[bank]);
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126 DmaSlowCell(source - 2, a, len, inc);
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131 } else if ((source & 0xfe0000) == 0x020000) { // Prg Ram
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132 base = (u16 *)Pico_mcd->prg_ram_b[r3 >> 6];
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133 source -= 2; // XXX: test
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138 // if we have DmaHook, let it handle ROM because of possible DMA delay
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140 if (PicoDmaHook && (source2 = PicoDmaHook(source, len, &base, &mask)))
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143 base = m68k_dma_source(source);
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146 elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow[%i] %06x->%04x: invalid src", Pico.video.type, source, a);
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150 // operate in words
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154 switch (Pico.video.type)
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158 if (inc == 2 && !(a & 1) && a + len * 2 < 0x10000
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159 && !(((source + len - 1) ^ source) & ~mask))
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161 // most used DMA mode
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162 memcpy((char *)r + a, base + (source & mask), len * 2);
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169 u16 d = base[source++ & mask];
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170 if(a & 1) d=(d<<8)|(d>>8);
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173 a = (u16)(a + inc);
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176 Pico.est.rendstatus |= PDRAW_DIRTY_SPRITES;
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180 Pico.m.dirtyPal = 1;
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184 r[(a / 2) & 0x3f] = base[source++ & mask];
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194 r[(a / 2) & 0x3f] = base[source++ & mask];
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200 case 0x81: // vram 128k
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201 a |= Pico.video.addr_u << 16;
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204 VideoWrite128(a, base[source++ & mask]);
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206 a = (a + inc) & 0x1ffff;
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208 Pico.video.addr_u = a >> 16;
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212 if (Pico.video.type != 0 || (EL_LOGMASK & EL_VDPDMA))
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213 elprintf(EL_VDPDMA|EL_ANOMALY, "DMA with bad type %i", Pico.video.type);
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217 Pico.video.addr=(u16)a;
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220 static void DmaCopy(int len)
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222 u16 a = Pico.video.addr;
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223 u8 *vr = (u8 *)PicoMem.vram;
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224 u8 inc = Pico.video.reg[0xf];
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226 elprintf(EL_VDPDMA, "DmaCopy len %i [%u]", len, SekCyclesDone());
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228 Pico.m.dma_xfers += len;
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229 if (Pico.m.dma_xfers < len)
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230 Pico.m.dma_xfers = ~0;
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231 Pico.video.status |= 2; // dma busy
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233 source =Pico.video.reg[0x15];
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234 source|=Pico.video.reg[0x16]<<8;
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238 vr[a] = vr[source++ & 0xffff];
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244 Pico.est.rendstatus |= PDRAW_DIRTY_SPRITES;
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247 static NOINLINE void DmaFill(int data)
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249 u16 a = Pico.video.addr;
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250 u8 *vr = (u8 *)PicoMem.vram;
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251 u8 high = (u8)(data >> 8);
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252 u8 inc = Pico.video.reg[0xf];
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256 len = GetDmaLength();
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257 elprintf(EL_VDPDMA, "DmaFill len %i inc %i [%u]", len, inc, SekCyclesDone());
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259 Pico.m.dma_xfers += len;
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260 if (Pico.m.dma_xfers < len) // lame 16bit var
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261 Pico.m.dma_xfers = ~0;
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262 Pico.video.status |= 2; // dma busy
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264 switch (Pico.video.type)
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267 for (l = len; l; l--) {
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268 // Write upper byte to adjacent address
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269 // (here we are byteswapped, so address is already 'adjacent')
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272 // Increment address register
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273 a = (u16)(a + inc);
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278 // TODO: needs fifo; anyone using these?
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281 elprintf(EL_STATUS|EL_ANOMALY|EL_VDPDMA, "TODO: cram/vsram fill");
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289 Pico.video.addr = a;
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291 Pico.video.reg[0x13] = Pico.video.reg[0x14] = 0;
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292 source = Pico.video.reg[0x15];
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293 source |= Pico.video.reg[0x16] << 8;
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295 Pico.video.reg[0x15] = source;
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296 Pico.video.reg[0x16] = source >> 8;
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298 Pico.est.rendstatus |= PDRAW_DIRTY_SPRITES;
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301 static NOINLINE void CommandDma(void)
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303 struct PicoVideo *pvid=&Pico.video;
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307 if ((pvid->reg[1]&0x10)==0) return; // DMA not enabled
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309 len = GetDmaLength();
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310 source =Pico.video.reg[0x15];
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311 source|=Pico.video.reg[0x16] << 8;
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312 source|=Pico.video.reg[0x17] << 16;
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314 method=pvid->reg[0x17]>>6;
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316 DmaSlow(len, source << 1); // 68000 to VDP
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317 else if (method == 3)
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318 DmaCopy(len); // VRAM Copy
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323 Pico.video.reg[0x13] = Pico.video.reg[0x14] = 0;
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324 Pico.video.reg[0x15] = source;
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325 Pico.video.reg[0x16] = source >> 8;
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328 static NOINLINE void CommandChange(void)
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330 struct PicoVideo *pvid = &Pico.video;
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331 unsigned int cmd, addr;
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333 cmd = pvid->command;
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335 // Get type of transfer 0xc0000030 (v/c/vsram read/write)
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336 pvid->type = (u8)(((cmd >> 2) & 0xc) | (cmd >> 30));
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337 if (pvid->type == 1) // vram
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338 pvid->type |= pvid->reg[1] & 0x80; // 128k
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340 // Get address 0x3fff0003
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341 addr = (cmd >> 16) & 0x3fff;
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342 addr |= (cmd << 14) & 0xc000;
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343 pvid->addr = (u16)addr;
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344 pvid->addr_u = (u8)((cmd >> 2) & 1);
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347 static void DrawSync(int blank_on)
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349 if (Pico.m.scanline < 224 && !(PicoOpt & POPT_ALT_RENDERER) &&
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350 !PicoSkipFrame && Pico.est.DrawScanline <= Pico.m.scanline) {
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351 //elprintf(EL_ANOMALY, "sync");
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352 PicoDrawSync(Pico.m.scanline, blank_on);
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356 PICO_INTERNAL_ASM void PicoVideoWrite(unsigned int a,unsigned short d)
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358 struct PicoVideo *pvid=&Pico.video;
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360 //elprintf(EL_STATUS, "PicoVideoWrite [%06x] %04x [%u] @ %06x",
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361 // a, d, SekCyclesDone(), SekPc);
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366 case 0x00: // Data port 0 or 2
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367 // try avoiding the sync..
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368 if (Pico.m.scanline < 224 && (pvid->reg[1]&0x40) &&
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369 !(!pvid->pending &&
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370 ((pvid->command & 0xc00000f0) == 0x40000010 && PicoMem.vsram[pvid->addr>>1] == d))
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374 if (pvid->pending) {
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379 if (!(pvid->status & SR_VB) && !(PicoOpt&POPT_DIS_VDP_FIFO))
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381 int use = pvid->type == 1 ? 2 : 1;
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382 pvid->lwrite_cnt -= use;
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383 if (pvid->lwrite_cnt < 0)
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385 elprintf(EL_ASVDP, "VDP data write: [%04x] %04x [%u] {%i} #%i @ %06x",
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386 Pico.video.addr, d, SekCyclesDone(), Pico.video.type, pvid->lwrite_cnt, SekPc);
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390 if ((pvid->command&0x80) && (pvid->reg[1]&0x10) && (pvid->reg[0x17]>>6)==2)
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395 case 0x04: // Control (command) port 4 or 6
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398 // Low word of command:
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399 pvid->command &= 0xffff0000;
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400 pvid->command |= d;
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411 if ((d&0xc000)==0x8000)
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414 int num=(d>>8)&0x1f;
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415 int dold=pvid->reg[num];
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417 pvid->type=0; // register writes clear command (else no Sega logo in Golden Axe II)
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418 if (num > 0x0a && !(pvid->reg[1]&4)) {
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419 elprintf(EL_ANOMALY, "%02x written to reg %02x in SMS mode @ %06x", d, num, SekPc);
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423 if (num == 1 && !(d&0x40) && SekCyclesDone() - Pico.t.m68c_line_start <= 488-390)
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425 DrawSync(blank_on);
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426 pvid->reg[num]=(unsigned char)d;
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430 elprintf(EL_INTSW, "hint_onoff: %i->%i [%u] pend=%i @ %06x", (dold&0x10)>>4,
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431 (d&0x10)>>4, SekCyclesDone(), (pvid->pending_ints&0x10)>>4, SekPc);
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434 elprintf(EL_INTSW, "vint_onoff: %i->%i [%u] pend=%i @ %06x", (dold&0x20)>>5,
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435 (d&0x20)>>5, SekCyclesDone(), (pvid->pending_ints&0x20)>>5, SekPc);
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436 if (!(pvid->status & PVS_VB2))
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437 pvid->status &= ~SR_VB;
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438 pvid->status |= ((d >> 3) ^ SR_VB) & SR_VB; // forced blanking
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441 //elprintf(EL_STATUS, "spritep moved to %04x", (unsigned)(Pico.video.reg[5]&0x7f) << 9);
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442 if (d^dold) Pico.est.rendstatus |= PDRAW_SPRITES_MOVED;
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445 // renderers should update their palettes if sh/hi mode is changed
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446 if ((d^dold)&8) Pico.m.dirtyPal = 2;
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452 #ifndef EMU_CORE_DEBUG
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453 // update IRQ level
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454 if (!SekShouldInterrupt()) // hack
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456 int lines, pints, irq = 0;
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457 lines = (pvid->reg[1] & 0x20) | (pvid->reg[0] & 0x10);
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458 pints = pvid->pending_ints & lines;
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459 if (pints & 0x20) irq = 6;
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460 else if (pints & 0x10) irq = 4;
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461 SekInterrupt(irq); // update line
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463 // this is broken because cost of current insn isn't known here
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464 if (irq) SekEndRun(21); // make it delayed
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470 // High word of command:
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471 pvid->command&=0x0000ffff;
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472 pvid->command|=d<<16;
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478 // case 0x08: // 08 0a - HV counter - lock up
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479 // case 0x0c: // 0c 0e - HV counter - lock up
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480 // case 0x10: // 10 12 - PSG - handled by caller
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481 // case 0x14: // 14 16 - PSG - handled by caller
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482 // case 0x18: // 18 1a - no effect?
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483 case 0x1c: // 1c 1e - debug
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486 if (d & (1 << 6)) {
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487 pvid->debug_p |= PVD_KILL_A | PVD_KILL_B;
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488 pvid->debug_p |= PVD_KILL_S_LO | PVD_KILL_S_HI;
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490 switch ((d >> 7) & 3) {
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492 pvid->debug_p &= ~(PVD_KILL_S_LO | PVD_KILL_S_HI);
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493 pvid->debug_p |= PVD_FORCE_S;
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496 pvid->debug_p &= ~PVD_KILL_A;
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497 pvid->debug_p |= PVD_FORCE_A;
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500 pvid->debug_p &= ~PVD_KILL_B;
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501 pvid->debug_p |= PVD_FORCE_B;
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508 static u32 SrLow(const struct PicoVideo *pv)
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510 unsigned int c, d = pv->status;
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512 c = SekCyclesDone() - Pico.t.m68c_line_start - 39;
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518 PICO_INTERNAL_ASM unsigned int PicoVideoRead(unsigned int a)
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522 if (a == 0x04) // control port
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524 struct PicoVideo *pv = &Pico.video;
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525 unsigned int d = SrLow(pv);
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527 elprintf(EL_SR, "SR read: %04x [%u] @ %06x", d, SekCyclesDone(), SekPc);
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531 // H-counter info (based on Generator):
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533 // | <- hblank? -> |
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534 // start <416> hint <36> hdisplay <38> end // CPU cycles
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535 // |---------...---------|------------|-------------|
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536 // 0 B6 E4 FF // 40 cells
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537 // 0 93 E8 FF // 32 cells
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539 // Gens (?) v-render
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540 // start <hblank=84> hint hdisplay <404> |
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541 // |---------------------|--------------------------|
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542 // E4 (hc[0x43]==0) 07 B1 // 40
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543 // E8 (hc[0x45]==0) 05 91 // 32
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545 // check: Sonic 3D Blast bonus, Cannon Fodder, Chase HQ II, 3 Ninjas kick back, Road Rash 3, Skitchin', Wheel of Fortune
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546 if ((a&0x1c)==0x08)
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550 d = (SekCyclesDone() - Pico.t.m68c_line_start) & 0x1ff; // FIXME
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551 if (Pico.video.reg[12]&1)
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553 else d = hcounts_32[d];
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555 elprintf(EL_HVCNT, "hv: %02x %02x [%u] @ %06x", d, Pico.video.v_counter, SekCyclesDone(), SekPc);
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556 return d | (Pico.video.v_counter << 8);
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559 if (a==0x00) // data port
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561 return VideoRead();
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567 unsigned char PicoVideoRead8DataH(void)
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569 return VideoRead() >> 8;
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572 unsigned char PicoVideoRead8DataL(void)
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574 return VideoRead();
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577 unsigned char PicoVideoRead8CtlH(void)
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579 u8 d = (u8)(Pico.video.status >> 8);
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580 Pico.video.pending = 0;
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581 elprintf(EL_SR, "SR read (h): %02x @ %06x", d, SekPc);
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585 unsigned char PicoVideoRead8CtlL(void)
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587 u8 d = SrLow(&Pico.video);
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588 Pico.video.pending = 0;
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589 elprintf(EL_SR, "SR read (l): %02x @ %06x", d, SekPc);
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593 unsigned char PicoVideoRead8HV_H(void)
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595 elprintf(EL_HVCNT, "vcounter: %02x [%u] @ %06x", Pico.video.v_counter, SekCyclesDone(), SekPc);
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596 return Pico.video.v_counter;
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600 unsigned char PicoVideoRead8HV_L(void)
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602 u32 d = (SekCyclesDone() - Pico.t.m68c_line_start) & 0x1ff; // FIXME
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603 if (Pico.video.reg[12]&1)
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605 else d = hcounts_32[d];
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606 elprintf(EL_HVCNT, "hcounter: %02x [%u] @ %06x", d, SekCyclesDone(), SekPc);
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610 // vim:shiftwidth=2:ts=2:expandtab
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