Memory.c 20 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664
  1. // This is part of Pico Library
  2. // (c) Copyright 2004 Dave, All rights reserved.
  3. // (c) Copyright 2006 notaz, All rights reserved.
  4. // Free for non-commercial use.
  5. // For commercial use, separate licencing terms must be obtained.
  6. //#define __debug_io
  7. #include "PicoInt.h"
  8. #include "sound/sound.h"
  9. #include "sound/ym2612.h"
  10. #include "sound/sn76496.h"
  11. typedef unsigned char u8;
  12. typedef unsigned short u16;
  13. typedef unsigned int u32;
  14. extern unsigned int lastSSRamWrite; // used by serial SRAM code
  15. #ifdef _ASM_MEMORY_C
  16. u8 PicoRead8(u32 a);
  17. u16 PicoRead16(u32 a);
  18. void PicoWriteRomHW_SSF2(u32 a,u32 d);
  19. void PicoWriteRomHW_in1 (u32 a,u32 d);
  20. #endif
  21. #if defined(EMU_C68K) && defined(EMU_M68K)
  22. // cyclone debug mode
  23. u32 lastread_a, lastread_d[16]={0,}, lastwrite_cyc_d[16]={0,}, lastwrite_mus_d[16]={0,};
  24. int lrp_cyc=0, lrp_mus=0, lwp_cyc=0, lwp_mus=0;
  25. extern unsigned int ppop;
  26. #endif
  27. #if defined(EMU_C68K) || defined(EMU_A68K)
  28. static __inline int PicoMemBase(u32 pc)
  29. {
  30. int membase=0;
  31. if (pc<Pico.romsize+4)
  32. {
  33. membase=(int)Pico.rom; // Program Counter in Rom
  34. }
  35. else if ((pc&0xe00000)==0xe00000)
  36. {
  37. membase=(int)Pico.ram-(pc&0xff0000); // Program Counter in Ram
  38. }
  39. else
  40. {
  41. // Error - Program Counter is invalid
  42. membase=(int)Pico.rom;
  43. }
  44. return membase;
  45. }
  46. #endif
  47. #ifdef EMU_A68K
  48. extern u8 *OP_ROM=NULL,*OP_RAM=NULL;
  49. #endif
  50. static u32 CPU_CALL PicoCheckPc(u32 pc)
  51. {
  52. u32 ret=0;
  53. #if defined(EMU_C68K)
  54. pc-=PicoCpu.membase; // Get real pc
  55. pc&=0xfffffe;
  56. PicoCpu.membase=PicoMemBase(pc);
  57. ret = PicoCpu.membase+pc;
  58. #elif defined(EMU_A68K)
  59. OP_ROM=(u8 *)PicoMemBase(pc);
  60. // don't bother calling us back unless it's outside the 64k segment
  61. M68000_regs.AsmBank=(pc>>16);
  62. #endif
  63. return ret;
  64. }
  65. int PicoInitPc(u32 pc)
  66. {
  67. PicoCheckPc(pc);
  68. return 0;
  69. }
  70. #ifndef _ASM_MEMORY_C
  71. void PicoMemReset()
  72. {
  73. }
  74. #endif
  75. // -----------------------------------------------------------------
  76. #ifndef _ASM_MEMORY_C
  77. // address must already be checked
  78. static int SRAMRead(u32 a)
  79. {
  80. u8 *d = SRam.data-SRam.start+a;
  81. return (d[0]<<8)|d[1];
  82. }
  83. #endif
  84. // for nonstandard reads
  85. #ifndef _ASM_MEMORY_C
  86. static
  87. #endif
  88. u32 OtherRead16End(u32 a, int realsize)
  89. {
  90. u32 d=0;
  91. dprintf("strange r%i: %06x @%06x", realsize, a&0xffffff, SekPc);
  92. // for games with simple protection devices, discovered by Haze
  93. // some dumb detection is used, but that should be enough to make things work
  94. if ((a>>22) == 1 && Pico.romsize >= 512*1024) {
  95. if (*(int *)(Pico.rom+0x123e4) == 0x00550c39 && *(int *)(Pico.rom+0x123e8) == 0x00000040) { // Super Bubble Bobble (Unl) [!]
  96. if (a == 0x400000) { d=0x55<<8; goto end; }
  97. else if (a == 0x400002) { d=0x0f<<8; goto end; }
  98. }
  99. else if (*(int *)(Pico.rom+0x008c4) == 0x66240055 && *(int *)(Pico.rom+0x008c8) == 0x00404df9) { // Smart Mouse (Unl)
  100. if (a == 0x400000) { d=0x55<<8; goto end; }
  101. else if (a == 0x400002) { d=0x0f<<8; goto end; }
  102. else if (a == 0x400004) { d=0xaa<<8; goto end; }
  103. else if (a == 0x400006) { d=0xf0<<8; goto end; }
  104. }
  105. else if (*(int *)(Pico.rom+0x00404) == 0x00a90600 && *(int *)(Pico.rom+0x00408) == 0x6708b013) { // King of Fighters '98, The (Unl) [!]
  106. if (a == 0x480000 || a == 0x4800e0 || a == 0x4824a0 || a == 0x488880) { d=0xaa<<8; goto end; }
  107. else if (a == 0x4a8820) { d=0x0a<<8; goto end; }
  108. // there is also a read @ 0x4F8820 which needs 0, but that is returned in default case
  109. }
  110. else if (*(int *)(Pico.rom+0x01b24) == 0x004013f9 && *(int *)(Pico.rom+0x01b28) == 0x00ff0000) { // Mahjong Lover (Unl) [!]
  111. if (a == 0x400000) { d=0x90<<8; goto end; }
  112. else if (a == 0x401000) { d=0xd3<<8; goto end; } // this one doesn't seem to be needed, the code does 2 comparisons and only then
  113. // checks the result, which is of the above one. Left it just in case.
  114. }
  115. else if (*(int *)(Pico.rom+0x05254) == 0x0c3962d0 && *(int *)(Pico.rom+0x05258) == 0x00400055) { // Elf Wor (Unl)
  116. if (a == 0x400000) { d=0x55<<8; goto end; }
  117. else if (a == 0x400004) { d=0xc9<<8; goto end; } // this check is done if the above one fails
  118. else if (a == 0x400002) { d=0x0f<<8; goto end; }
  119. else if (a == 0x400006) { d=0x18<<8; goto end; } // similar to above
  120. }
  121. // our default behaviour is to return whatever was last written a 0x400000-0x7fffff range (used by Squirrel King (R) [!])
  122. // Lion King II, The (Unl) [!] writes @ 400000 and wants to get that val @ 400002 and wites another val
  123. // @ 400004 which is expected @ 400006, so we really remember 2 values here
  124. d = Pico.m.prot_bytes[(a>>2)&1]<<8;
  125. }
  126. else if (a == 0xa13000 && Pico.romsize >= 1024*1024) {
  127. if (*(int *)(Pico.rom+0xc8af0) == 0x30133013 && *(int *)(Pico.rom+0xc8af4) == 0x000f0240) { // Rockman X3 (Unl) [!]
  128. d=0x0c; goto end;
  129. }
  130. else if (*(int *)(Pico.rom+0x28888) == 0x07fc0000 && *(int *)(Pico.rom+0x2888c) == 0x4eb94e75) { // Bug's Life, A (Unl) [!]
  131. d=0x28; goto end; // does the check from RAM
  132. }
  133. else if (*(int *)(Pico.rom+0xc8778) == 0x30133013 && *(int *)(Pico.rom+0xc877c) == 0x000f0240) { // Super Mario Bros. (Unl) [!]
  134. d=0x0c; goto end; // seems to be the same code as in Rockman X3 (Unl) [!]
  135. }
  136. else if (*(int *)(Pico.rom+0xf20ec) == 0x30143013 && *(int *)(Pico.rom+0xf20f0) == 0x000f0200) { // Super Mario 2 1998 (Unl) [!]
  137. d=0x0a; goto end;
  138. }
  139. }
  140. else if (a == 0xa13002) { // Pocket Monsters (Unl)
  141. d=0x01; goto end;
  142. }
  143. else if (a == 0xa1303E) { // Pocket Monsters (Unl)
  144. d=0x1f; goto end;
  145. }
  146. else if (a == 0x30fe02) {
  147. // Virtua Racing - just for fun
  148. // this seems to be some flag that SVP is ready or something similar
  149. d=1; goto end;
  150. }
  151. end:
  152. dprintf("ret = %04x", d);
  153. return d;
  154. }
  155. //extern UINT32 mz80GetRegisterValue(void *, UINT32);
  156. static void OtherWrite8End(u32 a,u32 d,int realsize)
  157. {
  158. // sram
  159. //if(a==0x200000) dprintf("cc : %02x @ %06x [%i|%i]", d, SekPc, SekCyclesDoneT(), SekCyclesDone());
  160. //if(a==0x200001) dprintf("w8 : %02x @ %06x [%i]", d, SekPc, SekCyclesDoneT());
  161. if(a >= SRam.start && a <= SRam.end) {
  162. unsigned int sreg = Pico.m.sram_reg;
  163. if(!(sreg & 0x10)) {
  164. // not detected SRAM
  165. if((a&~1)==0x200000) {
  166. Pico.m.sram_reg|=4; // this should be a game with EEPROM (like NBA Jam)
  167. SRam.start=0x200000; SRam.end=SRam.start+1;
  168. }
  169. Pico.m.sram_reg|=0x10;
  170. }
  171. if(sreg & 4) { // EEPROM write
  172. if(SekCyclesDoneT()-lastSSRamWrite < 46) {
  173. // just update pending state
  174. SRAMUpdPending(a, d);
  175. } else {
  176. SRAMWriteEEPROM(sreg>>6); // execute pending
  177. SRAMUpdPending(a, d);
  178. lastSSRamWrite = SekCyclesDoneT();
  179. }
  180. } else if(!(sreg & 2)) {
  181. u8 *pm=(u8 *)(SRam.data-SRam.start+a);
  182. if(*pm != (u8)d) {
  183. SRam.changed = 1;
  184. *pm=(u8)d;
  185. }
  186. }
  187. return;
  188. }
  189. #ifdef _ASM_MEMORY_C
  190. // special ROM hardware (currently only banking and sram reg supported)
  191. if((a&0xfffff1) == 0xA130F1) {
  192. PicoWriteRomHW_SSF2(a, d); // SSF2 or SRAM
  193. return;
  194. }
  195. #else
  196. // sram access register
  197. if(a == 0xA130F1) {
  198. Pico.m.sram_reg = (u8)(d&3);
  199. return;
  200. }
  201. #endif
  202. dprintf("strange w%i: %06x, %08x @%06x", realsize, a&0xffffff, d, SekPc);
  203. if(a >= 0xA13004 && a < 0xA13040) {
  204. // dumb 12-in-1 or 4-in-1 banking support
  205. int len;
  206. a &= 0x3f; a <<= 16;
  207. len = Pico.romsize - a;
  208. if (len <= 0) return; // invalid/missing bank
  209. if (len > 0x200000) len = 0x200000; // 2 megs
  210. memcpy(Pico.rom, Pico.rom+a, len); // code which does this is in RAM so this is safe.
  211. return;
  212. }
  213. // for games with simple protection devices, discovered by Haze
  214. else if ((a>>22) == 1)
  215. Pico.m.prot_bytes[(a>>2)&1] = (u8)d;
  216. }
  217. #include "MemoryCmn.c"
  218. // -----------------------------------------------------------------
  219. // Read Rom and read Ram
  220. #ifndef _ASM_MEMORY_C
  221. u8 CPU_CALL PicoRead8(u32 a)
  222. {
  223. u32 d=0;
  224. if ((a&0xe00000)==0xe00000) { d = *(u8 *)(Pico.ram+((a^1)&0xffff)); goto end; } // Ram
  225. a&=0xffffff;
  226. #if !(defined(EMU_C68K) && defined(EMU_M68K))
  227. // sram
  228. if(a >= SRam.start && a <= SRam.end) {
  229. unsigned int sreg = Pico.m.sram_reg;
  230. if(!(sreg & 0x10) && (sreg & 1) && a > 0x200001) { // not yet detected SRAM
  231. Pico.m.sram_reg|=0x10; // should be normal SRAM
  232. }
  233. if(sreg & 4) { // EEPROM read
  234. d = SRAMReadEEPROM();
  235. goto end;
  236. } else if(sreg & 1) {
  237. d = *(u8 *)(SRam.data-SRam.start+a);
  238. goto end;
  239. }
  240. }
  241. #endif
  242. if (a<Pico.romsize) { d = *(u8 *)(Pico.rom+(a^1)); goto end; } // Rom
  243. if ((a&0xff4000)==0xa00000) { d=z80Read8(a); goto end; } // Z80 Ram
  244. d=OtherRead16(a&~1, 8); if ((a&1)==0) d>>=8;
  245. end:
  246. //if ((a&0xe0ffff)==0xe0AE57+0x69c)
  247. // dprintf("r8 : %06x, %02x @%06x", a&0xffffff, (u8)d, SekPc);
  248. //if ((a&0xe0ffff)==0xe0a9ba+0x69c)
  249. // dprintf("r8 : %06x, %02x @%06x", a&0xffffff, d, SekPc);
  250. //if(a==0x200001) dprintf("r8 : %02x @ %06x [%i]", d, SekPc, SekCyclesDoneT());
  251. //dprintf("r8 : %06x, %02x @%06x [%03i]", a&0xffffff, (u8)d, SekPc, Pico.m.scanline);
  252. #ifdef __debug_io
  253. dprintf("r8 : %06x, %02x @%06x", a&0xffffff, (u8)d, SekPc);
  254. #endif
  255. #if defined(EMU_C68K) && defined(EMU_M68K)
  256. if(a>=Pico.romsize&&(ppop&0x3f)!=0x3a&&(ppop&0x3f)!=0x3b) {
  257. lastread_a = a;
  258. lastread_d[lrp_cyc++&15] = (u8)d;
  259. }
  260. #endif
  261. return (u8)d;
  262. }
  263. u16 CPU_CALL PicoRead16(u32 a)
  264. {
  265. u16 d=0;
  266. if ((a&0xe00000)==0xe00000) { d=*(u16 *)(Pico.ram+(a&0xfffe)); goto end; } // Ram
  267. a&=0xfffffe;
  268. #if !(defined(EMU_C68K) && defined(EMU_M68K))
  269. // sram
  270. if(a >= SRam.start && a <= SRam.end && (Pico.m.sram_reg & 1)) {
  271. d = (u16) SRAMRead(a);
  272. goto end;
  273. }
  274. #endif
  275. if (a<Pico.romsize) { d = *(u16 *)(Pico.rom+a); goto end; } // Rom
  276. d = (u16)OtherRead16(a, 16);
  277. end:
  278. //if ((a&0xe0ffff)==0xe0AF0E+0x69c||(a&0xe0ffff)==0xe0A9A8+0x69c||(a&0xe0ffff)==0xe0A9AA+0x69c||(a&0xe0ffff)==0xe0A9AC+0x69c)
  279. // dprintf("r16: %06x, %04x @%06x", a&0xffffff, d, SekPc);
  280. #ifdef __debug_io
  281. dprintf("r16: %06x, %04x @%06x", a&0xffffff, d, SekPc);
  282. #endif
  283. #if defined(EMU_C68K) && defined(EMU_M68K)
  284. if(a>=Pico.romsize&&(ppop&0x3f)!=0x3a&&(ppop&0x3f)!=0x3b) {
  285. lastread_a = a;
  286. lastread_d[lrp_cyc++&15] = d;
  287. }
  288. #endif
  289. return d;
  290. }
  291. u32 CPU_CALL PicoRead32(u32 a)
  292. {
  293. u32 d=0;
  294. if ((a&0xe00000)==0xe00000) { u16 *pm=(u16 *)(Pico.ram+(a&0xfffe)); d = (pm[0]<<16)|pm[1]; goto end; } // Ram
  295. a&=0xfffffe;
  296. // sram
  297. if(a >= SRam.start && a <= SRam.end && (Pico.m.sram_reg & 1)) {
  298. d = (SRAMRead(a)<<16)|SRAMRead(a+2);
  299. goto end;
  300. }
  301. if (a<Pico.romsize) { u16 *pm=(u16 *)(Pico.rom+a); d = (pm[0]<<16)|pm[1]; goto end; } // Rom
  302. d = (OtherRead16(a, 32)<<16)|OtherRead16(a+2, 32);
  303. end:
  304. #ifdef __debug_io
  305. dprintf("r32: %06x, %08x @%06x", a&0xffffff, d, SekPc);
  306. #endif
  307. #if defined(EMU_C68K) && defined(EMU_M68K)
  308. if(a>=Pico.romsize&&(ppop&0x3f)!=0x3a&&(ppop&0x3f)!=0x3b) {
  309. lastread_a = a;
  310. lastread_d[lrp_cyc++&15] = d;
  311. }
  312. #endif
  313. return d;
  314. }
  315. #endif
  316. // -----------------------------------------------------------------
  317. // Write Ram
  318. static void CPU_CALL PicoWrite8(u32 a,u8 d)
  319. {
  320. #ifdef __debug_io
  321. dprintf("w8 : %06x, %02x @%06x", a&0xffffff, d, SekPc);
  322. #endif
  323. #if defined(EMU_C68K) && defined(EMU_M68K)
  324. lastwrite_cyc_d[lwp_cyc++&15] = d;
  325. #endif
  326. //if ((a&0xe0ffff)==0xe0a9ba+0x69c)
  327. // dprintf("w8 : %06x, %02x @%06x", a&0xffffff, d, SekPc);
  328. if ((a&0xe00000)==0xe00000) {
  329. if((a&0xffff)==0xf62a) dprintf("(f62a) = %02x [%i|%i] @ %x", d, Pico.m.scanline, SekCyclesDone(), SekPc);
  330. u8 *pm=(u8 *)(Pico.ram+((a^1)&0xffff)); pm[0]=d; return; } // Ram
  331. a&=0xffffff;
  332. OtherWrite8(a,d,8);
  333. }
  334. void CPU_CALL PicoWrite16(u32 a,u16 d)
  335. {
  336. #ifdef __debug_io
  337. dprintf("w16: %06x, %04x", a&0xffffff, d);
  338. #endif
  339. #if defined(EMU_C68K) && defined(EMU_M68K)
  340. lastwrite_cyc_d[lwp_cyc++&15] = d;
  341. #endif
  342. //if ((a&0xe0ffff)==0xe0AF0E+0x69c||(a&0xe0ffff)==0xe0A9A8+0x69c||(a&0xe0ffff)==0xe0A9AA+0x69c||(a&0xe0ffff)==0xe0A9AC+0x69c)
  343. // dprintf("w16: %06x, %04x @%06x", a&0xffffff, d, SekPc);
  344. if ((a&0xe00000)==0xe00000) { *(u16 *)(Pico.ram+(a&0xfffe))=d; return; } // Ram
  345. a&=0xfffffe;
  346. OtherWrite16(a,d);
  347. }
  348. static void CPU_CALL PicoWrite32(u32 a,u32 d)
  349. {
  350. #ifdef __debug_io
  351. dprintf("w32: %06x, %08x", a&0xffffff, d);
  352. #endif
  353. #if defined(EMU_C68K) && defined(EMU_M68K)
  354. lastwrite_cyc_d[lwp_cyc++&15] = d;
  355. #endif
  356. if ((a&0xe00000)==0xe00000)
  357. {
  358. // Ram:
  359. u16 *pm=(u16 *)(Pico.ram+(a&0xfffe));
  360. pm[0]=(u16)(d>>16); pm[1]=(u16)d;
  361. return;
  362. }
  363. a&=0xfffffe;
  364. OtherWrite16(a, (u16)(d>>16));
  365. OtherWrite16(a+2,(u16)d);
  366. }
  367. // -----------------------------------------------------------------
  368. void PicoMemSetup()
  369. {
  370. #ifdef EMU_C68K
  371. // Setup memory callbacks:
  372. PicoCpu.checkpc=PicoCheckPc;
  373. PicoCpu.fetch8 =PicoCpu.read8 =PicoRead8;
  374. PicoCpu.fetch16=PicoCpu.read16=PicoRead16;
  375. PicoCpu.fetch32=PicoCpu.read32=PicoRead32;
  376. PicoCpu.write8 =PicoWrite8;
  377. PicoCpu.write16=PicoWrite16;
  378. PicoCpu.write32=PicoWrite32;
  379. #endif
  380. }
  381. #ifdef EMU_A68K
  382. struct A68KInter
  383. {
  384. u32 unknown;
  385. u8 (__fastcall *Read8) (u32 a);
  386. u16 (__fastcall *Read16)(u32 a);
  387. u32 (__fastcall *Read32)(u32 a);
  388. void (__fastcall *Write8) (u32 a,u8 d);
  389. void (__fastcall *Write16) (u32 a,u16 d);
  390. void (__fastcall *Write32) (u32 a,u32 d);
  391. void (__fastcall *ChangePc)(u32 a);
  392. u8 (__fastcall *PcRel8) (u32 a);
  393. u16 (__fastcall *PcRel16)(u32 a);
  394. u32 (__fastcall *PcRel32)(u32 a);
  395. u16 (__fastcall *Dir16)(u32 a);
  396. u32 (__fastcall *Dir32)(u32 a);
  397. };
  398. struct A68KInter a68k_memory_intf=
  399. {
  400. 0,
  401. PicoRead8,
  402. PicoRead16,
  403. PicoRead32,
  404. PicoWrite8,
  405. PicoWrite16,
  406. PicoWrite32,
  407. PicoCheckPc,
  408. PicoRead8,
  409. PicoRead16,
  410. PicoRead32,
  411. PicoRead16, // unused
  412. PicoRead32, // unused
  413. };
  414. #endif
  415. #ifdef EMU_M68K
  416. unsigned int m68k_read_pcrelative_CD8 (unsigned int a);
  417. unsigned int m68k_read_pcrelative_CD16(unsigned int a);
  418. unsigned int m68k_read_pcrelative_CD32(unsigned int a);
  419. // these are allowed to access RAM
  420. unsigned int m68k_read_pcrelative_8 (unsigned int a) {
  421. a&=0xffffff;
  422. if(PicoMCD&1) return m68k_read_pcrelative_CD8(a);
  423. if(a<Pico.romsize) return *(u8 *)(Pico.rom+(a^1)); // Rom
  424. if((a&0xe00000)==0xe00000) return *(u8 *)(Pico.ram+((a^1)&0xffff)); // Ram
  425. return 0;//(u8) lastread_d;
  426. }
  427. unsigned int m68k_read_pcrelative_16(unsigned int a) {
  428. a&=0xffffff;
  429. if(PicoMCD&1) return m68k_read_pcrelative_CD16(a);
  430. if(a<Pico.romsize) return *(u16 *)(Pico.rom+(a&~1)); // Rom
  431. if((a&0xe00000)==0xe00000) return *(u16 *)(Pico.ram+(a&0xfffe)); // Ram
  432. return 0;//(u16) lastread_d;
  433. }
  434. unsigned int m68k_read_pcrelative_32(unsigned int a) {
  435. a&=0xffffff;
  436. if(PicoMCD&1) return m68k_read_pcrelative_CD32(a);
  437. if(a<Pico.romsize) { u16 *pm=(u16 *)(Pico.rom+(a&~1)); return (pm[0]<<16)|pm[1]; }
  438. if((a&0xe00000)==0xe00000) { u16 *pm=(u16 *)(Pico.ram+(a&0xfffe)); return (pm[0]<<16)|pm[1]; } // Ram
  439. return 0;//lastread_d;
  440. }
  441. unsigned int m68k_read_immediate_16(unsigned int a) { return m68k_read_pcrelative_16(a); }
  442. unsigned int m68k_read_immediate_32(unsigned int a) { return m68k_read_pcrelative_32(a); }
  443. unsigned int m68k_read_disassembler_8 (unsigned int a) { return m68k_read_pcrelative_8 (a); }
  444. unsigned int m68k_read_disassembler_16(unsigned int a) { return m68k_read_pcrelative_16(a); }
  445. unsigned int m68k_read_disassembler_32(unsigned int a) { return m68k_read_pcrelative_32(a); }
  446. #ifdef EMU_C68K
  447. // ROM only
  448. unsigned int m68k_read_memory_8(unsigned int a) { if(a<Pico.romsize) return *(u8 *) (Pico.rom+(a^1)); return (u8) lastread_d[lrp_mus++&15]; }
  449. unsigned int m68k_read_memory_16(unsigned int a) { if(a<Pico.romsize) return *(u16 *)(Pico.rom+(a&~1));return (u16) lastread_d[lrp_mus++&15]; }
  450. unsigned int m68k_read_memory_32(unsigned int a) { if(a<Pico.romsize) {u16 *pm=(u16 *)(Pico.rom+(a&~1));return (pm[0]<<16)|pm[1];} return lastread_d[lrp_mus++&15]; }
  451. // ignore writes, Cyclone already done that
  452. void m68k_write_memory_8(unsigned int address, unsigned int value) { lastwrite_mus_d[lwp_mus++&15] = value; }
  453. void m68k_write_memory_16(unsigned int address, unsigned int value) { lastwrite_mus_d[lwp_mus++&15] = value; }
  454. void m68k_write_memory_32(unsigned int address, unsigned int value) { lastwrite_mus_d[lwp_mus++&15] = value; }
  455. #else
  456. unsigned char PicoReadCD8w (unsigned int a);
  457. unsigned short PicoReadCD16w(unsigned int a);
  458. unsigned int PicoReadCD32w(unsigned int a);
  459. void PicoWriteCD8w (unsigned int a, unsigned char d);
  460. void PicoWriteCD16w(unsigned int a, unsigned short d);
  461. void PicoWriteCD32w(unsigned int a, unsigned int d);
  462. unsigned int m68k_read_memory_8(unsigned int address)
  463. {
  464. return (PicoMCD&1) ? PicoReadCD8w(address) : PicoRead8(address);
  465. }
  466. unsigned int m68k_read_memory_16(unsigned int address)
  467. {
  468. return (PicoMCD&1) ? PicoReadCD16w(address) : PicoRead16(address);
  469. }
  470. unsigned int m68k_read_memory_32(unsigned int address)
  471. {
  472. return (PicoMCD&1) ? PicoReadCD32w(address) : PicoRead32(address);
  473. }
  474. void m68k_write_memory_8(unsigned int address, unsigned int value)
  475. {
  476. if (PicoMCD&1) PicoWriteCD8w(address, (u8)value); else PicoWrite8(address, (u8)value);
  477. }
  478. void m68k_write_memory_16(unsigned int address, unsigned int value)
  479. {
  480. if (PicoMCD&1) PicoWriteCD16w(address,(u16)value); else PicoWrite16(address,(u16)value);
  481. }
  482. void m68k_write_memory_32(unsigned int address, unsigned int value)
  483. {
  484. if (PicoMCD&1) PicoWriteCD32w(address, value); else PicoWrite32(address, value);
  485. }
  486. #endif
  487. #endif // EMU_M68K
  488. // -----------------------------------------------------------------
  489. // z80 memhandlers
  490. unsigned char z80_read(unsigned short a)
  491. {
  492. u8 ret = 0;
  493. if ((a>>13)==2) // 0x4000-0x5fff (Charles MacDonald)
  494. {
  495. if(PicoOpt&1) ret = (u8) YM2612Read();
  496. goto end;
  497. }
  498. if (a>=0x8000)
  499. {
  500. u32 addr68k;
  501. addr68k=Pico.m.z80_bank68k<<15;
  502. addr68k+=a&0x7fff;
  503. ret = (u8) PicoRead8(addr68k);
  504. //dprintf("z80->68k w8 : %06x, %02x", addr68k, ret);
  505. goto end;
  506. }
  507. // should not be needed || dprintf("z80_read RAM");
  508. if (a<0x4000) { ret = (u8) Pico.zram[a&0x1fff]; goto end; }
  509. end:
  510. return ret;
  511. }
  512. unsigned short z80_read16(unsigned short a)
  513. {
  514. //dprintf("z80_read16");
  515. return (u16) ( (u16)z80_read(a) | ((u16)z80_read((u16)(a+1))<<8) );
  516. }
  517. void z80_write(unsigned char data, unsigned short a)
  518. {
  519. //if (a<0x4000)
  520. // dprintf("z80 w8 : %06x, %02x @%04x", a, data, mz80GetRegisterValue(NULL, 0));
  521. if ((a>>13)==2) // 0x4000-0x5fff (Charles MacDonald)
  522. {
  523. if(PicoOpt&1) emustatus|=YM2612Write(a, data);
  524. return;
  525. }
  526. if ((a&0xfff9)==0x7f11) // 7f11 7f13 7f15 7f17
  527. {
  528. if(PicoOpt&2) SN76496Write(data);
  529. return;
  530. }
  531. if ((a>>8)==0x60)
  532. {
  533. Pico.m.z80_bank68k>>=1;
  534. Pico.m.z80_bank68k|=(data&1)<<8;
  535. Pico.m.z80_bank68k&=0x1ff; // 9 bits and filled in the new top one
  536. return;
  537. }
  538. if (a>=0x8000)
  539. {
  540. u32 addr68k;
  541. addr68k=Pico.m.z80_bank68k<<15;
  542. addr68k+=a&0x7fff;
  543. PicoWrite8(addr68k, data);
  544. //dprintf("z80->68k w8 : %06x, %02x", addr68k, data);
  545. return;
  546. }
  547. // should not be needed, drZ80 knows how to access RAM itself || dprintf("z80_write RAM @ %08x", lr);
  548. if (a<0x4000) { Pico.zram[a&0x1fff]=data; return; }
  549. }
  550. void z80_write16(unsigned short data, unsigned short a)
  551. {
  552. //dprintf("z80_write16");
  553. z80_write((unsigned char) data,a);
  554. z80_write((unsigned char)(data>>8),(u16)(a+1));
  555. }