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picodrive/Pico/cd/Memory.c
notaz d0d47c5be3 bios CD player runs 
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@15 be3aeb3a-fb24-0410-a615-afba39da0efa
2007-01-03 23:07:22 +00:00

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// This is part of Pico Library
// (c) Copyright 2004 Dave, All rights reserved.
// (c) Copyright 2006 notaz, All rights reserved.
// Free for non-commercial use.
// For commercial use, separate licencing terms must be obtained.
// A68K no longer supported here
//#define __debug_io
#include "../PicoInt.h"
#include "../sound/sound.h"
#include "../sound/ym2612.h"
#include "../sound/sn76496.h"
typedef unsigned char u8;
typedef unsigned short u16;
typedef unsigned int u32;
//#define __debug_io
//#define __debug_io2
// -----------------------------------------------------------------
// extern m68ki_cpu_core m68ki_cpu;
extern int counter75hz;
static u32 m68k_reg_read16(u32 a, int realsize)
{
u32 d=0;
a &= 0x3e;
// dprintf("m68k_regs r%2i: [%02x] @%06x", realsize&~1, a+(realsize&1), SekPc);
switch (a) {
case 0:
d = ((Pico_mcd->s68k_regs[0x33]<<13)&0x8000) | Pico_mcd->m68k_regs[1]; // here IFL2 is always 0, just like in Gens
goto end;
case 2:
d = (Pico_mcd->s68k_regs[a]<<8) | (Pico_mcd->s68k_regs[a+1]&0xc7);
goto end;
case 8:
dprintf("m68k host data read");
d = Read_CDC_Host(0);
goto end;
case 0xC:
dprintf("m68k stopwatch read");
break;
}
if (a < 0xE) {
d = (Pico_mcd->m68k_regs[a]<<8) | Pico_mcd->m68k_regs[a+1];
goto end;
}
if (a < 0x30) {
// comm flag/cmd/status (0xE-0x2F)
d = (Pico_mcd->s68k_regs[a]<<8) | Pico_mcd->s68k_regs[a+1];
goto end;
}
dprintf("m68k_regs invalid read @ %02x", a);
end:
// dprintf("ret = %04x", d);
return d;
}
static void m68k_reg_write8(u32 a, u32 d, int realsize)
{
a &= 0x3f;
// dprintf("m68k_regs w%2i: [%02x] %02x @%06x", realsize, a, d, SekPc);
switch (a) {
case 0:
d &= 1;
if ((d&1) && (Pico_mcd->s68k_regs[0x33]&(1<<2))) { dprintf("m68k: s68k irq 2"); SekInterruptS68k(2); }
break;
case 1:
d &= 3;
if (!(d&1)) PicoMCD |= 2; // reset pending, needed to be sure we fetch the right vectors on reset
if ( (Pico_mcd->m68k_regs[1]&1) != (d&1)) dprintf("m68k: s68k reset %i", !(d&1));
if ( (Pico_mcd->m68k_regs[1]&2) != (d&2)) dprintf("m68k: s68k brq %i", (d&2)>>1);
if (/*!(Pico_mcd->m68k_regs[1]&1) &&*/ (PicoMCD&2) && (d&3)==1) {
SekResetS68k(); // S68k comes out of RESET or BRQ state
PicoMCD&=~2;
dprintf("m68k: resetting s68k, cycles=%i", SekCyclesLeft);
}
break;
case 2:
Pico_mcd->s68k_regs[2] = d; // really use s68k side register
return;
case 3:
d &= 0xc2;
if ((Pico_mcd->s68k_regs[3]>>6) != ((d>>6)&3))
dprintf("m68k: prg bank: %i -> %i", (Pico_mcd->s68k_regs[a]>>6), ((d>>6)&3));
//if ((Pico_mcd->s68k_regs[3]&4) != (d&4)) dprintf("m68k: ram mode %i mbit", (d&4) ? 1 : 2);
//if ((Pico_mcd->s68k_regs[3]&2) != (d&2)) dprintf("m68k: %s", (d&4) ? ((d&2) ? "word swap req" : "noop?") :
// ((d&2) ? "word ram to s68k" : "word ram to m68k"));
d |= Pico_mcd->s68k_regs[3]&0x1d;
if (!(d & 4) && (d & 2)) d &= ~1; // return word RAM to s68k in 2M mode
Pico_mcd->s68k_regs[3] = d; // really use s68k side register
return;
case 0xe:
//dprintf("m68k: comm flag: %02x", d);
//dprintf("s68k @ %06x", SekPcS68k);
Pico_mcd->s68k_regs[0xe] = d;
break;
}
if (a < 0x10) {
Pico_mcd->m68k_regs[a] = (u8) d;
return;
}
if ((a&0xf0) == 0x10) {
Pico_mcd->s68k_regs[a] = d;
return;
}
if (a >= 0x20 || (a >= 0xa && a <= 0xd) || a == 0x0f)
dprintf("m68k: invalid write?");
}
static u32 s68k_reg_read16(u32 a, int realsize)
{
u32 d=0;
a &= 0x1fe;
// dprintf("s68k_regs r%2i: [%02x] @ %06x", realsize&~1, a+(realsize&1), SekPcS68k);
switch (a) {
case 0:
d = 1; goto end; // ver = 0, not in reset state
case 2:
d = (Pico_mcd->s68k_regs[a]<<8) | (Pico_mcd->s68k_regs[a+1]&0x1f);
goto end;
case 6:
d = CDC_Read_Reg();
goto end;
case 8:
dprintf("s68k host data read");
d = Read_CDC_Host(1);
goto end;
case 0xC:
dprintf("s68k stopwatch read");
break;
case 0x34: // fader
d = 0; // no busy bit
goto end;
}
d = (Pico_mcd->s68k_regs[a]<<8) | Pico_mcd->s68k_regs[a+1];
end:
// dprintf("ret = %04x", d);
return d;
}
static void s68k_reg_write8(u32 a, u32 d, int realsize)
{
a &= 0x1ff;
//dprintf("s68k_regs w%2i: [%02x] %02x @ %06x", realsize, a, d, SekPcS68k);
// TODO: review against Gens
switch (a) {
case 2:
return; // only m68k can change WP
case 3:
d &= 0x1d;
if (d&4) {
d |= Pico_mcd->s68k_regs[3]&0xc2;
if ((d ^ Pico_mcd->s68k_regs[3]) & 5) d &= ~2; // in case of mode or bank change we clear DMNA (m68k req) bit
} else {
d |= Pico_mcd->s68k_regs[3]&0xc3;
if (d&1) d &= ~2; // return word RAM to m68k in 2M mode
}
break;
case 4:
dprintf("s68k CDC dest: %x", d&7);
Pico_mcd->s68k_regs[4] = (Pico_mcd->s68k_regs[4]&0xC0) | (d&7); // CDC mode
return;
case 5:
dprintf("s68k CDC reg addr: %x", d&0xf);
break;
case 7:
CDC_Write_Reg(d);
return;
case 0xa:
dprintf("s68k set CDC dma addr");
break;
case 0x33: // IRQ mask
dprintf("s68k irq mask: %02x", d);
if ((d&(1<<4)) && (Pico_mcd->s68k_regs[0x37]&4) && !(Pico_mcd->s68k_regs[0x33]&(1<<4))) {
CDD_Export_Status();
// counter75hz = 0; // ???
}
break;
case 0x34: // fader
Pico_mcd->s68k_regs[a] = (u8) d & 0x7f;
return;
case 0x36:
return; // d/m bit is unsetable
case 0x37: {
u32 d_old = Pico_mcd->s68k_regs[0x37];
Pico_mcd->s68k_regs[0x37] = d&7;
if ((d&4) && !(d_old&4)) {
CDD_Export_Status();
// counter75hz = 0; // ???
}
return;
}
case 0x4b:
Pico_mcd->s68k_regs[a] = (u8) d;
CDD_Import_Command();
return;
}
if ((a&0x1f0) == 0x10 || a == 0x0e || (a >= 0x38 && a < 0x42))
{
dprintf("m68k: invalid write @ %02x?", a);
return;
}
Pico_mcd->s68k_regs[a] = (u8) d;
}
static int PadRead(int i)
{
int pad=0,value=0,TH;
pad=~PicoPad[i]; // Get inverse of pad MXYZ SACB RLDU
TH=Pico.ioports[i+1]&0x40;
if(PicoOpt & 0x20) { // 6 button gamepad enabled
int phase = Pico.m.padTHPhase[i];
if(phase == 2 && !TH) {
value=(pad&0xc0)>>2; // ?0SA 0000
goto end;
} else if(phase == 3 && TH) {
value=(pad&0x30)|((pad>>8)&0xf); // ?1CB MXYZ
goto end;
} else if(phase == 3 && !TH) {
value=((pad&0xc0)>>2)|0x0f; // ?0SA 1111
goto end;
}
}
if(TH) value=(pad&0x3f); // ?1CB RLDU
else value=((pad&0xc0)>>2)|(pad&3); // ?0SA 00DU
end:
// orr the bits, which are set as output
value |= Pico.ioports[i+1]&Pico.ioports[i+4];
return value; // will mirror later
}
static u8 z80Read8(u32 a)
{
if(Pico.m.z80Run&1) return 0;
a&=0x1fff;
if(!(PicoOpt&4)) {
// Z80 disabled, do some faking
static u8 zerosent = 0;
if(a == Pico.m.z80_lastaddr) { // probably polling something
u8 d = Pico.m.z80_fakeval;
if((d & 0xf) == 0xf && !zerosent) {
d = 0; zerosent = 1;
} else {
Pico.m.z80_fakeval++;
zerosent = 0;
}
return d;
} else {
Pico.m.z80_fakeval = 0;
}
}
Pico.m.z80_lastaddr = (u16) a;
return Pico.zram[a];
}
// for nonstandard reads
static u32 UnusualRead16(u32 a, int realsize)
{
u32 d=0;
dprintf("unusual r%i: %06x @%06x", realsize&~1, (a&0xfffffe)+(realsize&1), SekPc);
dprintf("ret = %04x", d);
return d;
}
static u32 OtherRead16(u32 a, int realsize)
{
u32 d=0;
if ((a&0xff0000)==0xa00000) {
if ((a&0x4000)==0x0000) { d=z80Read8(a); d|=d<<8; goto end; } // Z80 ram (not byteswaped)
if ((a&0x6000)==0x4000) { if(PicoOpt&1) d=YM2612Read(); else d=Pico.m.rotate++&3; goto end; } // 0x4000-0x5fff, Fudge if disabled
d=0xffff; goto end;
}
if ((a&0xffffe0)==0xa10000) { // I/O ports
a=(a>>1)&0xf;
switch(a) {
case 0: d=Pico.m.hardware; break; // Hardware value (Version register)
case 1: d=PadRead(0); d|=Pico.ioports[1]&0x80; break;
case 2: d=PadRead(1); d|=Pico.ioports[2]&0x80; break;
default: d=Pico.ioports[a]; break; // IO ports can be used as RAM
}
d|=d<<8;
goto end;
}
// |=0x80 for Shadow of the Beast & Super Offroad; rotate fakes next fetched instruction for Time Killers
if (a==0xa11100) { d=((Pico.m.z80Run&1)<<8)|0x8000|Pico.m.rotate++; goto end; }
if ((a&0xe700e0)==0xc00000) { d=PicoVideoRead(a); goto end; }
if ((a&0xffffc0)==0xa12000) {
d=m68k_reg_read16(a, realsize);
goto end;
}
d = UnusualRead16(a, realsize);
end:
return d;
}
//extern UINT32 mz80GetRegisterValue(void *, UINT32);
static void OtherWrite8(u32 a,u32 d,int realsize)
{
if ((a&0xe700f9)==0xc00011||(a&0xff7ff9)==0xa07f11) { if(PicoOpt&2) SN76496Write(d); return; } // PSG Sound
if ((a&0xff4000)==0xa00000) { if(!(Pico.m.z80Run&1)) Pico.zram[a&0x1fff]=(u8)d; return; } // Z80 ram
if ((a&0xff6000)==0xa04000) { if(PicoOpt&1) emustatus|=YM2612Write(a&3, d); return; } // FM Sound
if ((a&0xffffe0)==0xa10000) { // I/O ports
a=(a>>1)&0xf;
// 6 button gamepad: if TH went from 0 to 1, gamepad changes state
if(PicoOpt&0x20) {
if(a==1) {
Pico.m.padDelay[0] = 0;
if(!(Pico.ioports[1]&0x40) && (d&0x40)) Pico.m.padTHPhase[0]++;
}
else if(a==2) {
Pico.m.padDelay[1] = 0;
if(!(Pico.ioports[2]&0x40) && (d&0x40)) Pico.m.padTHPhase[1]++;
}
}
Pico.ioports[a]=(u8)d; // IO ports can be used as RAM
return;
}
if (a==0xa11100) {
extern int z80startCycle, z80stopCycle;
//int lineCycles=(488-SekCyclesLeft)&0x1ff;
d&=1; d^=1;
if(!d) {
// hack: detect a nasty situation where Z80 was enabled and disabled in the same 68k timeslice (Golden Axe III)
if((PicoOpt&4) && Pico.m.z80Run==1) z80_run(20);
z80stopCycle = SekCyclesDone();
//z80ExtraCycles += (lineCycles>>1)-(lineCycles>>5); // only meaningful in PicoFrameHints()
} else {
z80startCycle = SekCyclesDone();
//if(Pico.m.scanline != -1)
//z80ExtraCycles -= (lineCycles>>1)-(lineCycles>>5)+16;
}
//dprintf("set_zrun: %i [%i|%i] zPC=%04x @%06x", d, Pico.m.scanline, SekCyclesDone(), mz80GetRegisterValue(NULL, 0), SekPc);
Pico.m.z80Run=(u8)d; return;
}
if (a==0xa11200) { if(!(d&1)) z80_reset(); return; }
if ((a&0xff7f00)==0xa06000) // Z80 BANK register
{
Pico.m.z80_bank68k>>=1;
Pico.m.z80_bank68k|=(d&1)<<8;
Pico.m.z80_bank68k&=0x1ff; // 9 bits and filled in the new top one
return;
}
if ((a&0xe700e0)==0xc00000) { PicoVideoWrite(a,(u16)(d|(d<<8))); return; } // Byte access gets mirrored
if ((a&0xffffc0)==0xa12000) { m68k_reg_write8(a, d, realsize); return; }
dprintf("strange w%i: %06x, %08x @%06x", realsize, a&0xffffff, d, SekPc);
}
static void OtherWrite16(u32 a,u32 d)
{
if ((a&0xe700e0)==0xc00000) { PicoVideoWrite(a,(u16)d); return; }
if ((a&0xff4000)==0xa00000) { if(!(Pico.m.z80Run&1)) Pico.zram[a&0x1fff]=(u8)(d>>8); return; } // Z80 ram (MSB only)
if ((a&0xffffe0)==0xa10000) { // I/O ports
a=(a>>1)&0xf;
// 6 button gamepad: if TH went from 0 to 1, gamepad changes state
if(PicoOpt&0x20) {
if(a==1) {
Pico.m.padDelay[0] = 0;
if(!(Pico.ioports[1]&0x40) && (d&0x40)) Pico.m.padTHPhase[0]++;
}
else if(a==2) {
Pico.m.padDelay[1] = 0;
if(!(Pico.ioports[2]&0x40) && (d&0x40)) Pico.m.padTHPhase[1]++;
}
}
Pico.ioports[a]=(u8)d; // IO ports can be used as RAM
return;
}
if (a==0xa11100) { OtherWrite8(a, d>>8, 16); return; }
if (a==0xa11200) { if(!(d&0x100)) z80_reset(); return; }
OtherWrite8(a, d>>8, 16);
OtherWrite8(a+1,d&0xff, 16);
}
// -----------------------------------------------------------------
// Read Rom and read Ram
u8 PicoReadM68k8(u32 a)
{
u32 d=0;
if ((a&0xe00000)==0xe00000) { d = *(u8 *)(Pico.ram+((a^1)&0xffff)); goto end; } // Ram
a&=0xffffff;
if (a < 0x20000) { d = *(u8 *)(Pico_mcd->bios+(a^1)); goto end; } // bios
// prg RAM
if ((a&0xfe0000)==0x020000) {
u8 *prg_bank = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];
d = *(prg_bank+((a^1)&0x1ffff));
goto end;
}
// word RAM
if ((a&0xfc0000)==0x200000) {
dprintf("m68k_wram r8: [%06x] @%06x", a, SekPc);
if (Pico_mcd->s68k_regs[3]&4) { // 1M mode?
// TODO
} else {
// allow access in any mode, like Gens does
d = Pico_mcd->word_ram[(a^1)&0x3ffff];
}
dprintf("ret = %02x", (u8)d);
goto end;
}
if ((a&0xff4000)==0xa00000) { d=z80Read8(a); goto end; } // Z80 Ram
if ((a&0xffffc0)==0xa12000)
dprintf("m68k_regs r8: [%02x] @%06x", a&0x3f, SekPc);
d=OtherRead16(a&~1, 8|(a&1)); if ((a&1)==0) d>>=8;
if ((a&0xffffc0)==0xa12000)
dprintf("ret = %02x", (u8)d);
end:
#ifdef __debug_io
dprintf("r8 : %06x, %02x @%06x", a&0xffffff, (u8)d, SekPc);
#endif
return (u8)d;
}
u16 PicoReadM68k16(u32 a)
{
u16 d=0;
if ((a&0xe00000)==0xe00000) { d=*(u16 *)(Pico.ram+(a&0xfffe)); goto end; } // Ram
a&=0xfffffe;
if (a < 0x20000) { d = *(u16 *)(Pico_mcd->bios+a); goto end; } // bios
// prg RAM
if ((a&0xfe0000)==0x020000) {
u8 *prg_bank = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];
d = *(u16 *)(prg_bank+(a&0x1fffe));
goto end;
}
// word RAM
if ((a&0xfc0000)==0x200000) {
dprintf("m68k_wram r16: [%06x] @%06x", a, SekPc);
if (Pico_mcd->s68k_regs[3]&4) { // 1M mode?
// TODO
} else {
// allow access in any mode, like Gens does
d = *(u16 *)(Pico_mcd->word_ram+(a&0x3fffe));
}
dprintf("ret = %04x", d);
goto end;
}
if ((a&0xffffc0)==0xa12000)
dprintf("m68k_regs r16: [%02x] @%06x", a&0x3f, SekPc);
d = (u16)OtherRead16(a, 16);
if ((a&0xffffc0)==0xa12000)
dprintf("ret = %04x", d);
end:
#ifdef __debug_io
dprintf("r16: %06x, %04x @%06x", a&0xffffff, d, SekPc);
#endif
return d;
}
u32 PicoReadM68k32(u32 a)
{
u32 d=0;
if ((a&0xe00000)==0xe00000) { u16 *pm=(u16 *)(Pico.ram+(a&0xfffe)); d = (pm[0]<<16)|pm[1]; goto end; } // Ram
a&=0xfffffe;
if (a < 0x20000) { u16 *pm=(u16 *)(Pico_mcd->bios+a); d = (pm[0]<<16)|pm[1]; goto end; } // bios
// prg RAM
if ((a&0xfe0000)==0x020000) {
u8 *prg_bank = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];
u16 *pm=(u16 *)(prg_bank+(a&0x1fffe));
d = (pm[0]<<16)|pm[1];
goto end;
}
// word RAM
if ((a&0xfc0000)==0x200000) {
dprintf("m68k_wram r32: [%06x] @%06x", a, SekPc);
if (Pico_mcd->s68k_regs[3]&4) { // 1M mode?
// TODO
} else {
// allow access in any mode, like Gens does
u16 *pm=(u16 *)(Pico_mcd->word_ram+(a&0x3fffe)); d = (pm[0]<<16)|pm[1];
}
dprintf("ret = %08x", d);
goto end;
}
if ((a&0xffffc0)==0xa12000)
dprintf("m68k_regs r32: [%02x] @%06x", a&0x3f, SekPc);
d = (OtherRead16(a, 32)<<16)|OtherRead16(a+2, 32);
if ((a&0xffffc0)==0xa12000)
dprintf("ret = %08x", d);
end:
#ifdef __debug_io
dprintf("r32: %06x, %08x @%06x", a&0xffffff, d, SekPc);
#endif
return d;
}
// -----------------------------------------------------------------
// Write Ram
void PicoWriteM68k8(u32 a,u8 d)
{
#ifdef __debug_io
dprintf("w8 : %06x, %02x @%06x", a&0xffffff, d, SekPc);
#endif
//if ((a&0xe0ffff)==0xe0a9ba+0x69c)
// dprintf("w8 : %06x, %02x @%06x", a&0xffffff, d, SekPc);
if ((a&0xe00000)==0xe00000) { u8 *pm=(u8 *)(Pico.ram+((a^1)&0xffff)); pm[0]=d; return; } // Ram
a&=0xffffff;
// prg RAM
if ((a&0xfe0000)==0x020000) {
u8 *prg_bank = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];
u8 *pm=(u8 *)(prg_bank+((a^1)&0x1ffff));
*pm=d;
return;
}
// word RAM
if ((a&0xfc0000)==0x200000) {
dprintf("m68k_wram w8: [%06x] %02x @%06x", a, d, SekPc);
if (Pico_mcd->s68k_regs[3]&4) { // 1M mode?
// TODO
} else {
// allow access in any mode, like Gens does
u8 *pm=(u8 *)(Pico_mcd->word_ram+((a^1)&0x3ffff));
*pm=d;
}
return;
}
if ((a&0xffffc0)==0xa12000)
dprintf("m68k_regs w8: [%02x] %02x @%06x", a&0x3f, d, SekPc);
OtherWrite8(a,d,8);
}
void PicoWriteM68k16(u32 a,u16 d)
{
#ifdef __debug_io
dprintf("w16: %06x, %04x", a&0xffffff, d);
#endif
//if ((a&0xe0ffff)==0xe0AF0E+0x69c||(a&0xe0ffff)==0xe0A9A8+0x69c||(a&0xe0ffff)==0xe0A9AA+0x69c||(a&0xe0ffff)==0xe0A9AC+0x69c)
// dprintf("w16: %06x, %04x @%06x", a&0xffffff, d, SekPc);
if ((a&0xe00000)==0xe00000) { *(u16 *)(Pico.ram+(a&0xfffe))=d; return; } // Ram
a&=0xfffffe;
// prg RAM
if ((a&0xfe0000)==0x020000) {
u8 *prg_bank = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];
*(u16 *)(prg_bank+(a&0x1fffe))=d;
return;
}
// word RAM
if ((a&0xfc0000)==0x200000) {
dprintf("m68k_wram w16: [%06x] %04x @%06x", a, d, SekPc);
if (Pico_mcd->s68k_regs[3]&4) { // 1M mode?
// TODO
} else {
// allow access in any mode, like Gens does
*(u16 *)(Pico_mcd->word_ram+(a&0x3fffe))=d;
}
return;
}
if ((a&0xffffc0)==0xa12000)
dprintf("m68k_regs w16: [%02x] %04x @%06x", a&0x3f, d, SekPc);
OtherWrite16(a,d);
}
void PicoWriteM68k32(u32 a,u32 d)
{
#ifdef __debug_io
dprintf("w32: %06x, %08x", a&0xffffff, d);
#endif
if ((a&0xe00000)==0xe00000)
{
// Ram:
u16 *pm=(u16 *)(Pico.ram+(a&0xfffe));
pm[0]=(u16)(d>>16); pm[1]=(u16)d;
return;
}
a&=0xfffffe;
// prg RAM
if ((a&0xfe0000)==0x020000) {
u8 *prg_bank = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];
u16 *pm=(u16 *)(prg_bank+(a&0x1fffe));
pm[0]=(u16)(d>>16); pm[1]=(u16)d;
return;
}
// word RAM
if ((a&0xfc0000)==0x200000) {
if (d != 0) // don't log clears
dprintf("m68k_wram w32: [%06x] %08x @%06x", a, d, SekPc);
if (Pico_mcd->s68k_regs[3]&4) { // 1M mode?
// TODO
} else {
// allow access in any mode, like Gens does
u16 *pm=(u16 *)(Pico_mcd->word_ram+(a&0x3fffe));
pm[0]=(u16)(d>>16); pm[1]=(u16)d;
}
return;
}
if ((a&0xffffc0)==0xa12000)
dprintf("m68k_regs w32: [%02x] %08x @%06x", a&0x3f, d, SekPc);
OtherWrite16(a, (u16)(d>>16));
OtherWrite16(a+2,(u16)d);
}
// -----------------------------------------------------------------
u8 PicoReadS68k8(u32 a)
{
u32 d=0;
a&=0xffffff;
// prg RAM
if (a < 0x80000) {
d = *(Pico_mcd->prg_ram+(a^1));
goto end;
}
// regs
if ((a&0xfffe00) == 0xff8000) {
dprintf("s68k_regs r8: [%02x] @ %06x", a&0x1ff, SekPcS68k);
d = s68k_reg_read16(a&~1, 8|(a&1)); if ((a&1)==0) d>>=8;
dprintf("ret = %02x", (u8)d);
goto end;
}
// word RAM (2M area)
if ((a&0xfc0000)==0x080000) { // 080000-0bffff
dprintf("s68k_wram2M r8: [%06x] @%06x", a, SekPc);
if (Pico_mcd->s68k_regs[3]&4) { // 1M mode?
// TODO (decode)
dprintf("(decode)");
} else {
// allow access in any mode, like Gens does
d = Pico_mcd->word_ram[(a^1)&0x3ffff];
}
dprintf("ret = %02x", (u8)d);
goto end;
}
// word RAM (1M area)
if ((a&0xfe0000)==0x0c0000 && (Pico_mcd->s68k_regs[3]&4)) { // 0c0000-0dffff
dprintf("s68k_wram1M r8: [%06x] @%06x", a, SekPc);
// TODO
goto end;
}
dprintf("s68k r8 : %06x, %02x @%06x", a&0xffffff, (u8)d, SekPcS68k);
end:
#ifdef __debug_io2
dprintf("s68k r8 : %06x, %02x @%06x", a&0xffffff, (u8)d, SekPcS68k);
#endif
return (u8)d;
}
u16 PicoReadS68k16(u32 a)
{
u16 d=0;
a&=0xfffffe;
// prg RAM
if (a < 0x80000) {
d = *(u16 *)(Pico_mcd->prg_ram+a);
goto end;
}
// regs
if ((a&0xfffe00) == 0xff8000) {
dprintf("s68k_regs r16: [%02x] @ %06x", a&0x1fe, SekPcS68k);
d = s68k_reg_read16(a, 16);
dprintf("ret = %04x", d);
goto end;
}
// word RAM (2M area)
if ((a&0xfc0000)==0x080000) { // 080000-0bffff
dprintf("s68k_wram2M r16: [%06x] @%06x", a, SekPc);
if (Pico_mcd->s68k_regs[3]&4) { // 1M mode?
// TODO (decode)
dprintf("(decode)");
} else {
// allow access in any mode, like Gens does
d = *(u16 *)(Pico_mcd->word_ram+(a&0x3fffe));
}
dprintf("ret = %04x", (u8)d);
goto end;
}
// word RAM (1M area)
if ((a&0xfe0000)==0x0c0000 && (Pico_mcd->s68k_regs[3]&4)) { // 0c0000-0dffff
dprintf("s68k_wram1M r16: [%06x] @%06x", a, SekPc);
// TODO
goto end;
}
dprintf("s68k r16: %06x, %04x @%06x", a&0xffffff, d, SekPcS68k);
end:
#ifdef __debug_io2
dprintf("s68k r16: %06x, %04x @%06x", a&0xffffff, d, SekPcS68k);
#endif
return d;
}
u32 PicoReadS68k32(u32 a)
{
u32 d=0;
a&=0xfffffe;
// prg RAM
if (a < 0x80000) {
u16 *pm=(u16 *)(Pico_mcd->prg_ram+a);
d = (pm[0]<<16)|pm[1];
goto end;
}
// regs
if ((a&0xfffe00) == 0xff8000) {
dprintf("s68k_regs r32: [%02x] @ %06x", a&0x1fe, SekPcS68k);
d = (s68k_reg_read16(a, 32)<<16)|s68k_reg_read16(a+2, 32);
dprintf("ret = %08x", d);
goto end;
}
// word RAM (2M area)
if ((a&0xfc0000)==0x080000) { // 080000-0bffff
dprintf("s68k_wram2M r32: [%06x] @%06x", a, SekPc);
if (Pico_mcd->s68k_regs[3]&4) { // 1M mode?
// TODO (decode)
dprintf("(decode)");
} else {
// allow access in any mode, like Gens does
u16 *pm=(u16 *)(Pico_mcd->word_ram+(a&0x3fffe)); d = (pm[0]<<16)|pm[1];
}
dprintf("ret = %08x", (u8)d);
goto end;
}
// word RAM (1M area)
if ((a&0xfe0000)==0x0c0000 && (Pico_mcd->s68k_regs[3]&4)) { // 0c0000-0dffff
dprintf("s68k_wram1M 32: [%06x] @%06x", a, SekPc);
// TODO
goto end;
}
dprintf("s68k r32: %06x, %08x @%06x", a&0xffffff, d, SekPcS68k);
end:
#ifdef __debug_io2
dprintf("s68k r32: %06x, %08x @%06x", a&0xffffff, d, SekPcS68k);
#endif
return d;
}
// -----------------------------------------------------------------
void PicoWriteS68k8(u32 a,u8 d)
{
#ifdef __debug_io2
dprintf("s68k w8 : %06x, %02x @%06x", a&0xffffff, d, SekPcS68k);
#endif
a&=0xffffff;
// prg RAM
if (a < 0x80000) {
u8 *pm=(u8 *)(Pico_mcd->prg_ram+(a^1));
*pm=d;
return;
}
if (a != 0xff0011 && (a&0xff8000) == 0xff0000) // PCM hack
return;
// regs
if ((a&0xfffe00) == 0xff8000) {
dprintf("s68k_regs w8: [%02x] %02x @ %06x", a&0x1ff, d, SekPcS68k);
s68k_reg_write8(a,d,8);
return;
}
// word RAM (2M area)
if ((a&0xfc0000)==0x080000) { // 080000-0bffff
dprintf("s68k_wram2M w8: [%06x] %02x @%06x", a, d, SekPc);
if (Pico_mcd->s68k_regs[3]&4) { // 1M mode?
// TODO (decode)
dprintf("(decode)");
} else {
// allow access in any mode, like Gens does
u8 *pm=(u8 *)(Pico_mcd->word_ram+((a^1)&0x3ffff));
*pm=d;
}
return;
}
// word RAM (1M area)
if ((a&0xfe0000)==0x0c0000 && (Pico_mcd->s68k_regs[3]&4)) { // 0c0000-0dffff
if (d)
dprintf("s68k_wram1M w8: [%06x] %02x @%06x", a, d, SekPc);
// TODO
return;
}
dprintf("s68k w8 : %06x, %02x @%06x", a&0xffffff, d, SekPcS68k);
}
void PicoWriteS68k16(u32 a,u16 d)
{
#ifdef __debug_io2
dprintf("s68k w16: %06x, %04x @%06x", a&0xffffff, d, SekPcS68k);
#endif
a&=0xfffffe;
// prg RAM
if (a < 0x80000) {
*(u16 *)(Pico_mcd->prg_ram+a)=d;
return;
}
// regs
if ((a&0xfffe00) == 0xff8000) {
dprintf("s68k_regs w16: [%02x] %04x @ %06x", a&0x1ff, d, SekPcS68k);
s68k_reg_write8(a, d>>8, 16);
s68k_reg_write8(a+1,d&0xff, 16);
return;
}
// word RAM (2M area)
if ((a&0xfc0000)==0x080000) { // 080000-0bffff
dprintf("s68k_wram2M w16: [%06x] %04x @%06x", a, d, SekPc);
if (Pico_mcd->s68k_regs[3]&4) { // 1M mode?
// TODO (decode)
dprintf("(decode)");
} else {
// allow access in any mode, like Gens does
*(u16 *)(Pico_mcd->word_ram+(a&0x3fffe))=d;
}
return;
}
// word RAM (1M area)
if ((a&0xfe0000)==0x0c0000 && (Pico_mcd->s68k_regs[3]&4)) { // 0c0000-0dffff
if (d)
dprintf("s68k_wram1M w16: [%06x] %04x @%06x", a, d, SekPc);
// TODO
return;
}
dprintf("s68k w16: %06x, %04x @%06x", a&0xffffff, d, SekPcS68k);
}
void PicoWriteS68k32(u32 a,u32 d)
{
#ifdef __debug_io2
dprintf("s68k w32: %06x, %08x @%06x", a&0xffffff, d, SekPcS68k);
#endif
a&=0xfffffe;
// prg RAM
if (a < 0x80000) {
u16 *pm=(u16 *)(Pico_mcd->prg_ram+a);
pm[0]=(u16)(d>>16); pm[1]=(u16)d;
return;
}
// regs
if ((a&0xfffe00) == 0xff8000) {
dprintf("s68k_regs w32: [%02x] %08x @ %06x", a&0x1ff, d, SekPcS68k);
s68k_reg_write8(a, d>>24, 32);
s68k_reg_write8(a+1,(d>>16)&0xff, 32);
s68k_reg_write8(a+2,(d>>8) &0xff, 32);
s68k_reg_write8(a+3, d &0xff, 32);
return;
}
// word RAM (2M area)
if ((a&0xfc0000)==0x080000) { // 080000-0bffff
dprintf("s68k_wram2M w32: [%06x] %08x @%06x", a, d, SekPc);
if (Pico_mcd->s68k_regs[3]&4) { // 1M mode?
// TODO (decode)
dprintf("(decode)");
} else {
// allow access in any mode, like Gens does
u16 *pm=(u16 *)(Pico_mcd->word_ram+(a&0x3fffe));
pm[0]=(u16)(d>>16); pm[1]=(u16)d;
}
return;
}
// word RAM (1M area)
if ((a&0xfe0000)==0x0c0000 && (Pico_mcd->s68k_regs[3]&4)) { // 0c0000-0dffff
if (d)
dprintf("s68k_wram1M w32: [%06x] %08x @%06x", a, d, SekPc);
// TODO
return;
}
dprintf("s68k w32: %06x, %08x @%06x", a&0xffffff, d, SekPcS68k);
}
// -----------------------------------------------------------------
#ifdef EMU_M68K
unsigned char PicoReadCD8w (unsigned int a) {
return m68ki_cpu_p == &PicoS68kCPU ? PicoReadS68k8(a) : PicoReadM68k8(a);
}
unsigned short PicoReadCD16w(unsigned int a) {
return m68ki_cpu_p == &PicoS68kCPU ? PicoReadS68k16(a) : PicoReadM68k16(a);
}
unsigned int PicoReadCD32w(unsigned int a) {
return m68ki_cpu_p == &PicoS68kCPU ? PicoReadS68k32(a) : PicoReadM68k32(a);
}
void PicoWriteCD8w (unsigned int a, unsigned char d) {
if (m68ki_cpu_p == &PicoS68kCPU) PicoWriteS68k8(a, d); else PicoWriteM68k8(a, d);
}
void PicoWriteCD16w(unsigned int a, unsigned short d) {
if (m68ki_cpu_p == &PicoS68kCPU) PicoWriteS68k16(a, d); else PicoWriteM68k16(a, d);
}
void PicoWriteCD32w(unsigned int a, unsigned int d) {
if (m68ki_cpu_p == &PicoS68kCPU) PicoWriteS68k32(a, d); else PicoWriteM68k32(a, d);
}
// these are allowed to access RAM
unsigned int m68k_read_pcrelative_CD8 (unsigned int a) {
a&=0xffffff;
if(m68ki_cpu_p == &PicoS68kCPU) {
if (a < 0x80000) return *(u8 *)(Pico_mcd->prg_ram+(a^1)); // PRG Ram
else dprintf("s68k read_pcrel8 @ %06x", a);
} else {
if(a<Pico.romsize) return *(u8 *)(Pico.rom+(a^1)); // Rom
if((a&0xe00000)==0xe00000) return *(u8 *)(Pico.ram+((a^1)&0xffff)); // Ram
}
return 0;//(u8) lastread_d;
}
unsigned int m68k_read_pcrelative_CD16(unsigned int a) {
a&=0xffffff;
if(m68ki_cpu_p == &PicoS68kCPU) {
if (a < 0x80000) return *(u16 *)(Pico_mcd->prg_ram+(a&~1)); // PRG Ram
else dprintf("s68k read_pcrel16 @ %06x", a);
} else {
if(a<Pico.romsize) return *(u16 *)(Pico.rom+(a&~1)); // Rom
if((a&0xe00000)==0xe00000) return *(u16 *)(Pico.ram+(a&0xfffe)); // Ram
}
return 0;//(u16) lastread_d;
}
unsigned int m68k_read_pcrelative_CD32(unsigned int a) {
a&=0xffffff;
if(m68ki_cpu_p == &PicoS68kCPU) {
if (a < 0x80000) { u16 *pm=(u16 *)(Pico_mcd->prg_ram+(a&~1)); return (pm[0]<<16)|pm[1]; } // PRG Ram
else dprintf("s68k read_pcrel32 @ %06x", a);
} else {
if(a<Pico.romsize) { u16 *pm=(u16 *)(Pico.rom+(a&~1)); return (pm[0]<<16)|pm[1]; }
if((a&0xe00000)==0xe00000) { u16 *pm=(u16 *)(Pico.ram+(a&0xfffe)); return (pm[0]<<16)|pm[1]; } // Ram
}
return 0; //lastread_d;
}
#endif // EMU_M68K
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