mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-05 15:27:46 -04:00
d158df697d
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@575 be3aeb3a-fb24-0410-a615-afba39da0efa
275 lines
7.5 KiB
C
275 lines
7.5 KiB
C
#include "../pico_int.h"
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#include "../sound/sn76496.h"
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#ifndef UTYPES_DEFINED
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typedef unsigned char u8;
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typedef unsigned short u16;
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typedef unsigned int u32;
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#define UTYPES_DEFINED
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#endif
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// -----------------------------------------------------------------
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// Read Rom and read Ram
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static u32 PicoReadPico8(u32 a)
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{
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u32 d=0;
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if ((a&0xe00000)==0xe00000) { d = *(u8 *)(Pico.ram+((a^1)&0xffff)); goto end; } // Ram
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if (a<Pico.romsize) { d = *(u8 *)(Pico.rom+(a^1)); goto end; } // Rom
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a&=0xffffff;
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if ((a&0xfffff0)==0xc00000) { // VDP
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d=PicoVideoRead8(a);
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goto end;
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}
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if ((a&0xffffe0)==0x800000) // Pico I/O
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{
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switch (a & 0x1f)
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{
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case 0x01: d = PicoPicohw.r1; break;
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case 0x03:
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d = PicoPad[0]&0x1f; // d-pad
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d |= (PicoPad[0]&0x20) << 2; // pen push -> C
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d = ~d;
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break;
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case 0x05: d = (PicoPicohw.pen_pos[0] >> 8); break; // what is MS bit for? Games read it..
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case 0x07: d = PicoPicohw.pen_pos[0] & 0xff; break;
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case 0x09: d = (PicoPicohw.pen_pos[1] >> 8); break;
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case 0x0b: d = PicoPicohw.pen_pos[1] & 0xff; break;
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case 0x0d: d = (1 << (PicoPicohw.page & 7)) - 1; break;
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case 0x12: d = PicoPicohw.fifo_bytes == 0 ? 0x80 : 0; break; // guess
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default:
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elprintf(EL_UIO, "r8 : %06x, %02x @%06x", a&0xffffff, (u8)d, SekPc);
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break;
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}
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}
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//elprintf(EL_UIO, "r8 : %06x, %02x @%06x", a&0xffffff, (u8)d, SekPc);
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end:
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elprintf(EL_IO, "r8 : %06x, %02x @%06x", a&0xffffff, (u8)d, SekPc);
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return d;
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}
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static u32 PicoReadPico16(u32 a)
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{
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u32 d=0;
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if ((a&0xe00000)==0xe00000) { d=*(u16 *)(Pico.ram+(a&0xfffe)); goto end; } // Ram
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a&=0xfffffe;
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if (a<Pico.romsize) { d = *(u16 *)(Pico.rom+a); goto end; } // Rom
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if ((a&0xfffff0)==0xc00000) {
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d = PicoVideoRead(a);
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goto end;
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}
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if (a == 0x800010)
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d = (PicoPicohw.fifo_bytes > 0x3f) ? 0 : (0x3f - PicoPicohw.fifo_bytes);
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else if (a == 0x800012)
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d = PicoPicohw.fifo_bytes == 0 ? 0x8000 : 0; // guess
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else
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elprintf(EL_UIO, "r16: %06x, %04x @%06x", a&0xffffff, d, SekPc);
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//elprintf(EL_UIO, "r16: %06x, %04x @%06x", a&0xffffff, d, SekPc);
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end:
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elprintf(EL_IO, "r16: %06x, %04x @%06x", a&0xffffff, d, SekPc);
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return d;
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}
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static u32 PicoReadPico32(u32 a)
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{
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u32 d=0;
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if ((a&0xe00000)==0xe00000) { u16 *pm=(u16 *)(Pico.ram+(a&0xfffe)); d = (pm[0]<<16)|pm[1]; goto end; } // Ram
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a&=0xfffffe;
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if (a<Pico.romsize) { u16 *pm=(u16 *)(Pico.rom+a); d = (pm[0]<<16)|pm[1]; goto end; } // Rom
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if ((a&0xfffff0)==0xc00000) {
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d = (PicoVideoRead(a)<<16)|PicoVideoRead(a+2);
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goto end;
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}
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elprintf(EL_UIO, "r32: %06x, %08x @%06x", a&0xffffff, d, SekPc);
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end:
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elprintf(EL_IO, "r32: %06x, %08x @%06x", a&0xffffff, d, SekPc);
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return d;
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}
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// -----------------------------------------------------------------
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// Write Ram
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/*
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void dump(u16 w)
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{
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static FILE *f[0x10] = { NULL, };
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char fname[32];
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int num = PicoPicohw.r12 & 0xf;
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w = (w << 8) | (w >> 8);
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sprintf(fname, "ldump%i.bin", num);
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if (f[num] == NULL)
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f[num] = fopen(fname, "wb");
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fwrite(&w, 1, 2, f[num]);
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//fclose(f);
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}
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*/
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static void PicoWritePico8(u32 a,u8 d)
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{
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elprintf(EL_IO, "w8 : %06x, %02x @%06x", a&0xffffff, d, SekPc);
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if ((a&0xe00000)==0xe00000) { *(u8 *)(Pico.ram+((a^1)&0xffff))=d; return; } // Ram
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a&=0xffffff;
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if ((a&0xfffff9)==0xc00011) { if (PicoOpt&2) SN76496Write(d); return; } // PSG Sound
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if ((a&0xfffff0)==0xc00000) { // VDP
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d&=0xff;
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PicoVideoWrite(a,(u16)(d|(d<<8))); // Byte access gets mirrored
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return;
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}
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switch (a & 0x1f) {
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case 0x19: case 0x1b: case 0x1d: case 0x1f: break; // 'S' 'E' 'G' 'A'
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default:
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elprintf(EL_UIO, "w8 : %06x, %02x @%06x", a&0xffffff, d, SekPc);
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break;
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}
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//elprintf(EL_UIO, "w8 : %06x, %02x @%06x", a&0xffffff, d, SekPc);
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}
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static void PicoWritePico16(u32 a,u16 d)
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{
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elprintf(EL_IO, "w16: %06x, %04x", a&0xffffff, d);
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if ((a&0xe00000)==0xe00000) { *(u16 *)(Pico.ram+(a&0xfffe))=d; return; } // Ram
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a&=0xfffffe;
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if ((a&0xfffff0)==0xc00000) { PicoVideoWrite(a,(u16)d); return; } // VDP
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//if (a == 0x800010) dump(d);
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if (a == 0x800010)
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{
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PicoPicohw.fifo_bytes += 2;
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if (PicoPicohw.xpcm_ptr < PicoPicohw.xpcm_buffer + XPCM_BUFFER_SIZE) {
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*PicoPicohw.xpcm_ptr++ = d >> 8;
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*PicoPicohw.xpcm_ptr++ = d;
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}
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else if (PicoPicohw.xpcm_ptr == PicoPicohw.xpcm_buffer + XPCM_BUFFER_SIZE) {
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elprintf(EL_ANOMALY|EL_PICOHW, "xpcm_buffer overflow!");
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PicoPicohw.xpcm_ptr++;
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}
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}
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else if (a == 0x800012) {
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int r12_old = PicoPicohw.r12;
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PicoPicohw.r12 = d;
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if (r12_old != d)
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PicoReratePico();
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}
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else
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elprintf(EL_UIO, "w16: %06x, %04x", a&0xffffff, d);
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//elprintf(EL_UIO, "w16: %06x, %04x", a&0xffffff, d);
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}
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static void PicoWritePico32(u32 a,u32 d)
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{
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elprintf(EL_IO, "w32: %06x, %08x", a&0xffffff, d);
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if ((a&0xe00000)==0xe00000)
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{
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// Ram:
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u16 *pm=(u16 *)(Pico.ram+(a&0xfffe));
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pm[0]=(u16)(d>>16); pm[1]=(u16)d;
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return;
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}
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a&=0xfffffe;
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if ((a&0xfffff0)==0xc00000)
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{
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// VDP:
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PicoVideoWrite(a, (u16)(d>>16));
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PicoVideoWrite(a+2,(u16)d);
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return;
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}
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elprintf(EL_UIO, "w32: %06x, %08x", a&0xffffff, d);
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}
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#ifdef EMU_M68K
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extern unsigned int (*pm68k_read_memory_8) (unsigned int address);
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extern unsigned int (*pm68k_read_memory_16)(unsigned int address);
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extern unsigned int (*pm68k_read_memory_32)(unsigned int address);
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extern void (*pm68k_write_memory_8) (unsigned int address, unsigned char value);
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extern void (*pm68k_write_memory_16)(unsigned int address, unsigned short value);
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extern void (*pm68k_write_memory_32)(unsigned int address, unsigned int value);
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extern unsigned int (*pm68k_read_memory_pcr_8) (unsigned int address);
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extern unsigned int (*pm68k_read_memory_pcr_16)(unsigned int address);
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extern unsigned int (*pm68k_read_memory_pcr_32)(unsigned int address);
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static unsigned int m68k_read_memory_pcrp_8(unsigned int a)
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{
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if((a&0xe00000)==0xe00000) return *(u8 *)(Pico.ram+((a^1)&0xffff)); // Ram
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return 0;
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}
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static unsigned int m68k_read_memory_pcrp_16(unsigned int a)
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{
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if((a&0xe00000)==0xe00000) return *(u16 *)(Pico.ram+(a&0xfffe)); // Ram
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return 0;
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}
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static unsigned int m68k_read_memory_pcrp_32(unsigned int a)
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{
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if((a&0xe00000)==0xe00000) { u16 *pm=(u16 *)(Pico.ram+(a&0xfffe)); return (pm[0]<<16)|pm[1]; } // Ram
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return 0;
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}
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#endif // EMU_M68K
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PICO_INTERNAL void PicoMemSetupPico(void)
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{
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#ifdef EMU_C68K
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PicoCpuCM68k.checkpc=PicoCheckPc;
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PicoCpuCM68k.fetch8 =PicoCpuCM68k.read8 =PicoReadPico8;
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PicoCpuCM68k.fetch16=PicoCpuCM68k.read16=PicoReadPico16;
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PicoCpuCM68k.fetch32=PicoCpuCM68k.read32=PicoReadPico32;
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PicoCpuCM68k.write8 =PicoWritePico8;
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PicoCpuCM68k.write16=PicoWritePico16;
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PicoCpuCM68k.write32=PicoWritePico32;
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#endif
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#ifdef EMU_M68K
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pm68k_read_memory_8 = PicoReadPico8;
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pm68k_read_memory_16 = PicoReadPico16;
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pm68k_read_memory_32 = PicoReadPico32;
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pm68k_write_memory_8 = PicoWritePico8;
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pm68k_write_memory_16 = PicoWritePico16;
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pm68k_write_memory_32 = PicoWritePico32;
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pm68k_read_memory_pcr_8 = m68k_read_memory_pcrp_8;
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pm68k_read_memory_pcr_16 = m68k_read_memory_pcrp_16;
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pm68k_read_memory_pcr_32 = m68k_read_memory_pcrp_32;
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#endif
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#ifdef EMU_F68K
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// use standard setup, only override handlers
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PicoMemSetup();
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PicoCpuFM68k.read_byte =PicoReadPico8;
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PicoCpuFM68k.read_word =PicoReadPico16;
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PicoCpuFM68k.read_long =PicoReadPico32;
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PicoCpuFM68k.write_byte=PicoWritePico8;
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PicoCpuFM68k.write_word=PicoWritePico16;
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PicoCpuFM68k.write_long=PicoWritePico32;
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#endif
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}
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