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- #include "pico_int.h"
- #include "sound/sn76496.h"
- #define Z80_MEM_SHIFT 13
- unsigned long z80_read_map [0x10000 >> Z80_MEM_SHIFT];
- unsigned long z80_write_map[0x10000 >> Z80_MEM_SHIFT];
- #ifdef _USE_MZ80
- // memhandlers for mz80 core
- unsigned char mz80_read(UINT32 a, struct MemoryReadByte *w) { return z80_read(a); }
- void mz80_write(UINT32 a, UINT8 d, struct MemoryWriteByte *w) { z80_write(d, a); }
- // structures for mz80 core
- static struct MemoryReadByte mz80_mem_read[]=
- {
- {0x0000,0xffff,mz80_read},
- {(UINT32) -1,(UINT32) -1,NULL}
- };
- static struct MemoryWriteByte mz80_mem_write[]=
- {
- {0x0000,0xffff,mz80_write},
- {(UINT32) -1,(UINT32) -1,NULL}
- };
- static struct z80PortRead mz80_io_read[] ={
- {(UINT16) -1,(UINT16) -1,NULL}
- };
- static struct z80PortWrite mz80_io_write[]={
- {(UINT16) -1,(UINT16) -1,NULL}
- };
- int mz80_run(int cycles)
- {
- int ticks_pre = mz80GetElapsedTicks(0);
- mz80exec(cycles);
- return mz80GetElapsedTicks(0) - ticks_pre;
- }
- #endif
- #ifdef _USE_DRZ80
- struct DrZ80 drZ80;
- #endif
- PICO_INTERNAL void z80_init(void)
- {
- #ifdef _USE_MZ80
- struct mz80context z80;
- // z80
- mz80init();
- // Modify the default context
- mz80GetContext(&z80);
- // point mz80 stuff
- z80.z80Base=Pico.zram;
- z80.z80MemRead=mz80_mem_read;
- z80.z80MemWrite=mz80_mem_write;
- z80.z80IoRead=mz80_io_read;
- z80.z80IoWrite=mz80_io_write;
- mz80SetContext(&z80);
- #endif
- #ifdef _USE_DRZ80
- memset(&drZ80, 0, sizeof(drZ80));
- drZ80.z80_rebasePC=NULL; // unused, handled by xmap
- drZ80.z80_rebaseSP=NULL;
- drZ80.z80_read8 =(void *)z80_read_map;
- drZ80.z80_read16 =NULL;
- drZ80.z80_write8 =(void *)z80_write_map;
- drZ80.z80_write16 =NULL;
- drZ80.z80_irq_callback=NULL;
- #endif
- #ifdef _USE_CZ80
- memset(&CZ80, 0, sizeof(CZ80));
- Cz80_Init(&CZ80);
- Cz80_Set_ReadB(&CZ80, NULL); // unused (hacked in)
- Cz80_Set_WriteB(&CZ80, NULL);
- #endif
- }
- PICO_INTERNAL void z80_reset(void)
- {
- #ifdef _USE_MZ80
- mz80reset();
- #endif
- #ifdef _USE_DRZ80
- memset(&drZ80, 0, 0x54);
- drZ80.Z80F = (1<<2); // set ZFlag
- drZ80.Z80F2 = (1<<2); // set ZFlag
- drZ80.Z80IX = 0xFFFF << 16;
- drZ80.Z80IY = 0xFFFF << 16;
- drZ80.Z80IM = 0; // 1?
- drZ80.z80irqvector = 0xff0000; // RST 38h
- drZ80.Z80PC_BASE = drZ80.Z80PC = z80_read_map[0] << 1;
- // drZ80 is locked in single bank
- drZ80.Z80SP_BASE = ((PicoAHW & PAHW_SMS) ?
- z80_read_map[0xc000 >> Z80_MEM_SHIFT] : z80_read_map[0]) << 1;
- // drZ80.Z80SP = drZ80.z80_rebaseSP(0x2000); // 0xf000 ?
- #endif
- #ifdef _USE_CZ80
- Cz80_Reset(&CZ80);
- Cz80_Set_Reg(&CZ80, CZ80_IX, 0xffff);
- Cz80_Set_Reg(&CZ80, CZ80_IY, 0xffff);
- Cz80_Set_Reg(&CZ80, CZ80_SP, 0x2000);
- #endif
- }
- // XXX TODO: should better use universal z80 save format
- PICO_INTERNAL void z80_pack(unsigned char *data)
- {
- #if defined(_USE_MZ80)
- struct mz80context mz80;
- *(int *)data = 0x00005A6D; // "mZ"
- mz80GetContext(&mz80);
- memcpy(data+4, &mz80.z80clockticks, sizeof(mz80)-5*4); // don't save base&memhandlers
- #elif defined(_USE_DRZ80)
- *(int *)data = 0x015A7244; // "DrZ" v1
- // drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);
- // drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);
- memcpy(data+4, &drZ80, 0x54);
- #elif defined(_USE_CZ80)
- *(int *)data = 0x00007a43; // "Cz"
- *(int *)(data+4) = Cz80_Get_Reg(&CZ80, CZ80_PC);
- memcpy(data+8, &CZ80, (INT32)&CZ80.BasePC - (INT32)&CZ80);
- #endif
- }
- PICO_INTERNAL void z80_unpack(unsigned char *data)
- {
- #if defined(_USE_MZ80)
- if (*(int *)data == 0x00005A6D) { // "mZ" save?
- struct mz80context mz80;
- mz80GetContext(&mz80);
- memcpy(&mz80.z80clockticks, data+4, sizeof(mz80)-5*4);
- mz80SetContext(&mz80);
- } else {
- z80_reset();
- z80_int();
- }
- #elif defined(_USE_DRZ80)
- if (*(int *)data == 0x015A7244) { // "DrZ" v1 save?
- int pc, sp;
- memcpy(&drZ80, data+4, 0x54);
- pc = (drZ80.Z80PC - drZ80.Z80PC_BASE) & 0xffff;
- sp = (drZ80.Z80SP - drZ80.Z80SP_BASE) & 0xffff;
- // update bases
- drZ80.Z80PC_BASE = z80_read_map[pc >> Z80_MEM_SHIFT];
- if (drZ80.Z80PC & (1<<31)) {
- elprintf(EL_STATUS|EL_ANOMALY, "bad PC in z80 save: %04x", pc);
- drZ80.Z80PC_BASE = drZ80.Z80PC = z80_read_map[0];
- } else {
- drZ80.Z80PC_BASE <<= 1;
- drZ80.Z80PC = drZ80.Z80PC_BASE + pc;
- }
- drZ80.Z80SP_BASE = z80_read_map[sp >> Z80_MEM_SHIFT];
- if (drZ80.Z80SP & (1<<31)) {
- elprintf(EL_STATUS|EL_ANOMALY, "bad SP in z80 save: %04x", sp);
- drZ80.Z80SP_BASE = z80_read_map[0];
- drZ80.Z80SP = drZ80.Z80SP_BASE + (1 << Z80_MEM_SHIFT);
- } else {
- drZ80.Z80SP_BASE <<= 1;
- drZ80.Z80SP = drZ80.Z80SP_BASE + sp;
- }
- } else {
- z80_reset();
- drZ80.Z80IM = 1;
- z80_int(); // try to goto int handler, maybe we won't execute trash there?
- }
- #elif defined(_USE_CZ80)
- if (*(int *)data == 0x00007a43) { // "Cz" save?
- memcpy(&CZ80, data+8, (INT32)&CZ80.BasePC - (INT32)&CZ80);
- Cz80_Set_Reg(&CZ80, CZ80_PC, *(int *)(data+4));
- } else {
- z80_reset();
- z80_int();
- }
- #endif
- }
- PICO_INTERNAL void z80_exit(void)
- {
- #if defined(_USE_MZ80)
- mz80shutdown();
- #endif
- }
- PICO_INTERNAL void z80_debug(char *dstr)
- {
- #if defined(_USE_DRZ80)
- sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", drZ80.Z80PC-drZ80.Z80PC_BASE, drZ80.Z80SP-drZ80.Z80SP_BASE);
- #elif defined(_USE_CZ80)
- sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", CZ80.PC - CZ80.BasePC, CZ80.SP.W);
- #endif
- }
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