mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-04 23:07:46 -04:00
refactoring z80 if code for sms preparation
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@752 be3aeb3a-fb24-0410-a615-afba39da0efa
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notaz
parent
4010330cc0
commit
c8d1e9b662
10 changed files with 354 additions and 375 deletions
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@ -396,271 +396,3 @@ PICO_INTERNAL void PsndGetSamples(int y)
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#endif
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}
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// -----------------------------------------------------------------
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// z80 stuff
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#ifdef _USE_MZ80
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// memhandlers for mz80 core
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unsigned char mz80_read(UINT32 a, struct MemoryReadByte *w) { return z80_read(a); }
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void mz80_write(UINT32 a, UINT8 d, struct MemoryWriteByte *w) { z80_write(d, a); }
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// structures for mz80 core
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static struct MemoryReadByte mz80_mem_read[]=
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{
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{0x0000,0xffff,mz80_read},
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{(UINT32) -1,(UINT32) -1,NULL}
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};
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static struct MemoryWriteByte mz80_mem_write[]=
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{
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{0x0000,0xffff,mz80_write},
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{(UINT32) -1,(UINT32) -1,NULL}
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};
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static struct z80PortRead mz80_io_read[] ={
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{(UINT16) -1,(UINT16) -1,NULL}
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};
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static struct z80PortWrite mz80_io_write[]={
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{(UINT16) -1,(UINT16) -1,NULL}
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};
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int mz80_run(int cycles)
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{
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int ticks_pre = mz80GetElapsedTicks(0);
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mz80exec(cycles);
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return mz80GetElapsedTicks(0) - ticks_pre;
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}
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#endif
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#ifdef _USE_DRZ80
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struct DrZ80 drZ80;
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static unsigned int DrZ80_rebasePC(unsigned short a)
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{
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drZ80.Z80PC_BASE = (unsigned int) Pico.zram;
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return drZ80.Z80PC_BASE + a;
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}
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static unsigned int DrZ80_rebaseSP(unsigned short a)
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{
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drZ80.Z80SP_BASE = (unsigned int) Pico.zram;
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return drZ80.Z80SP_BASE + a;
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}
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#endif
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#if defined(_USE_DRZ80) || defined(_USE_CZ80)
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static unsigned char z80_in(unsigned short p)
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{
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elprintf(EL_ANOMALY, "Z80 port %04x read", p);
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return 0xff;
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}
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static void z80_out(unsigned short p,unsigned char d)
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{
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elprintf(EL_ANOMALY, "Z80 port %04x write %02x", p, d);
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}
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#endif
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// z80 functionality wrappers
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PICO_INTERNAL void z80_init(void)
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{
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#ifdef _USE_MZ80
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struct mz80context z80;
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// z80
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mz80init();
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// Modify the default context
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mz80GetContext(&z80);
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// point mz80 stuff
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z80.z80Base=Pico.zram;
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z80.z80MemRead=mz80_mem_read;
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z80.z80MemWrite=mz80_mem_write;
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z80.z80IoRead=mz80_io_read;
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z80.z80IoWrite=mz80_io_write;
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mz80SetContext(&z80);
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#endif
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#ifdef _USE_DRZ80
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memset(&drZ80, 0, sizeof(struct DrZ80));
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drZ80.z80_rebasePC=DrZ80_rebasePC;
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drZ80.z80_rebaseSP=DrZ80_rebaseSP;
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drZ80.z80_read8 =z80_read;
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drZ80.z80_read16 =NULL;
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drZ80.z80_write8 =z80_write;
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drZ80.z80_write16 =NULL;
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drZ80.z80_in =z80_in;
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drZ80.z80_out =z80_out;
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drZ80.z80_irq_callback=NULL;
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#endif
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#ifdef _USE_CZ80
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memset(&CZ80, 0, sizeof(CZ80));
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Cz80_Init(&CZ80);
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Cz80_Set_Fetch(&CZ80, 0x0000, 0x1fff, (UINT32)Pico.zram); // main RAM
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Cz80_Set_Fetch(&CZ80, 0x2000, 0x3fff, (UINT32)Pico.zram); // mirror
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Cz80_Set_ReadB(&CZ80, (UINT8 (*)(UINT32 address))z80_read); // unused (hacked in)
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Cz80_Set_WriteB(&CZ80, z80_write);
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Cz80_Set_INPort(&CZ80, z80_in);
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Cz80_Set_OUTPort(&CZ80, z80_out);
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#endif
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}
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PICO_INTERNAL void z80_reset(void)
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{
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#ifdef _USE_MZ80
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mz80reset();
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#endif
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#ifdef _USE_DRZ80
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memset(&drZ80, 0, 0x54);
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drZ80.Z80F = (1<<2); // set ZFlag
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drZ80.Z80F2 = (1<<2); // set ZFlag
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drZ80.Z80IX = 0xFFFF << 16;
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drZ80.Z80IY = 0xFFFF << 16;
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drZ80.Z80IM = 0; // 1?
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drZ80.z80irqvector = 0xff0000; // RST 38h
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drZ80.Z80PC = drZ80.z80_rebasePC(0);
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drZ80.Z80SP = drZ80.z80_rebaseSP(0x2000); // 0xf000 ?
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#endif
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#ifdef _USE_CZ80
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Cz80_Reset(&CZ80);
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Cz80_Set_Reg(&CZ80, CZ80_IX, 0xffff);
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Cz80_Set_Reg(&CZ80, CZ80_IY, 0xffff);
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Cz80_Set_Reg(&CZ80, CZ80_SP, 0x2000);
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#endif
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Pico.m.z80_fakeval = 0; // for faking when Z80 is disabled
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}
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#if 0
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static int had_irq = 0, z80_ppc, z80_ops_done = 0;
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int z80_cycles_left = 0;
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void z80_int(void)
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{
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had_irq = 1;
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}
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static void xfail(void)
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{
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printf("PC: %04x, %04x\n", Cz80_Get_Reg(&CZ80, CZ80_PC), z80_ppc);
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printf("z80_ops_done done: %i\n", z80_ops_done);
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exit(1);
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}
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int z80_run(int cycles)
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{
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int fail = 0;
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int cdrz, ccz;
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z80_cycles_left = cycles;
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z80_ppc = Cz80_Get_Reg(&CZ80, CZ80_PC);
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if (had_irq) {
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printf("irq @ %04x\n", Cz80_Get_Reg(&CZ80, CZ80_PC));
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Cz80_Set_IRQ(&CZ80, 0, HOLD_LINE);
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drZ80.Z80_IRQ = 1;
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had_irq = 0;
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}
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while (z80_cycles_left > 0)
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{
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ccz = Cz80_Exec(&CZ80, 1);
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cdrz = 1 - DrZ80Run(&drZ80, 1);
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if (drZ80.Z80_IRQ && (drZ80.Z80IF&1))
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cdrz += 1 - DrZ80Run(&drZ80, 1); // cz80 processes IRQ after EI, DrZ80 does not
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if (cdrz != ccz) {
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printf("cycles: %i vs %i\n", cdrz, ccz);
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fail = 1;
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}
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if (drZ80.Z80PC - drZ80.Z80PC_BASE != Cz80_Get_Reg(&CZ80, CZ80_PC)) {
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printf("PC: %04x vs %04x\n", drZ80.Z80PC - drZ80.Z80PC_BASE, Cz80_Get_Reg(&CZ80, CZ80_PC));
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fail = 1;
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}
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if (fail) xfail();
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z80_ops_done++;
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z80_cycles_left -= ccz;
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z80_ppc = Cz80_Get_Reg(&CZ80, CZ80_PC);
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}
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return co - z80_cycles_left;
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}
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#endif
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PICO_INTERNAL void z80_pack(unsigned char *data)
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{
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#if defined(_USE_MZ80)
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struct mz80context mz80;
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*(int *)data = 0x00005A6D; // "mZ"
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mz80GetContext(&mz80);
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memcpy(data+4, &mz80.z80clockticks, sizeof(mz80)-5*4); // don't save base&memhandlers
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#elif defined(_USE_DRZ80)
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*(int *)data = 0x015A7244; // "DrZ" v1
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drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);
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drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);
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memcpy(data+4, &drZ80, 0x54);
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#elif defined(_USE_CZ80)
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*(int *)data = 0x00007a43; // "Cz"
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*(int *)(data+4) = Cz80_Get_Reg(&CZ80, CZ80_PC);
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memcpy(data+8, &CZ80, (INT32)&CZ80.BasePC - (INT32)&CZ80);
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#endif
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}
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PICO_INTERNAL void z80_unpack(unsigned char *data)
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{
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#if defined(_USE_MZ80)
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if (*(int *)data == 0x00005A6D) { // "mZ" save?
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struct mz80context mz80;
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mz80GetContext(&mz80);
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memcpy(&mz80.z80clockticks, data+4, sizeof(mz80)-5*4);
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mz80SetContext(&mz80);
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} else {
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z80_reset();
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z80_int();
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}
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#elif defined(_USE_DRZ80)
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if (*(int *)data == 0x015A7244) { // "DrZ" v1 save?
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memcpy(&drZ80, data+4, 0x54);
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// update bases
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drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);
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drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);
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} else {
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z80_reset();
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drZ80.Z80IM = 1;
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z80_int(); // try to goto int handler, maybe we won't execute trash there?
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}
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#elif defined(_USE_CZ80)
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if (*(int *)data == 0x00007a43) { // "Cz" save?
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memcpy(&CZ80, data+8, (INT32)&CZ80.BasePC - (INT32)&CZ80);
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Cz80_Set_Reg(&CZ80, CZ80_PC, *(int *)(data+4));
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} else {
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z80_reset();
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z80_int();
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}
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#endif
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}
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PICO_INTERNAL void z80_exit(void)
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{
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#if defined(_USE_MZ80)
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mz80shutdown();
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#endif
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}
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#if 1 // defined(__DEBUG_PRINT) || defined(__GP2X__) || defined(__GIZ__)
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PICO_INTERNAL void z80_debug(char *dstr)
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{
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#if defined(_USE_DRZ80)
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sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", drZ80.Z80PC-drZ80.Z80PC_BASE, drZ80.Z80SP-drZ80.Z80SP_BASE);
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#elif defined(_USE_CZ80)
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sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", CZ80.PC - CZ80.BasePC, CZ80.SP.W);
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#endif
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}
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#endif
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