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https://github.com/RaySollium99/picodrive.git
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346 lines
10 KiB
C
346 lines
10 KiB
C
// Pico Library - Header File
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// (c) Copyright 2004 Dave, All rights reserved.
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// (c) Copyright 2006 notaz, All rights reserved.
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// Free for non-commercial use.
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// For commercial use, separate licencing terms must be obtained.
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "Pico.h"
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//
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#define USE_POLL_DETECT
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// to select core, define EMU_C68K, EMU_M68K or EMU_A68K in your makefile or project
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#ifdef __cplusplus
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extern "C" {
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#endif
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// ----------------------- 68000 CPU -----------------------
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#ifdef EMU_C68K
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#include "../cpu/Cyclone/Cyclone.h"
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extern struct Cyclone PicoCpu, PicoCpuS68k;
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#define SekCyclesLeftNoMCD PicoCpu.cycles // cycles left for this run
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#define SekCyclesLeft \
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(((PicoMCD&1) && (PicoOpt & 0x2000)) ? (SekCycleAim-SekCycleCnt) : SekCyclesLeftNoMCD)
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#define SekCyclesLeftS68k \
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((PicoOpt & 0x2000) ? (SekCycleAimS68k-SekCycleCntS68k) : PicoCpuS68k.cycles)
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#define SekSetCyclesLeftNoMCD(c) PicoCpu.cycles=c
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#define SekSetCyclesLeft(c) { \
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if ((PicoMCD&1) && (PicoOpt & 0x2000)) SekCycleCnt=SekCycleAim-(c); else SekSetCyclesLeftNoMCD(c); \
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}
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#define SekPc (PicoCpu.pc-PicoCpu.membase)
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#define SekPcS68k (PicoCpuS68k.pc-PicoCpuS68k.membase)
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#define SekSetStop(x) { PicoCpu.stopped=x; if (x) PicoCpu.cycles=0; }
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#define SekSetStopS68k(x) { PicoCpuS68k.stopped=x; if (x) PicoCpuS68k.cycles=0; }
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#endif
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#ifdef EMU_A68K
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void __cdecl M68000_RUN();
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// The format of the data in a68k.asm (at the _M68000_regs location)
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struct A68KContext
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{
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unsigned int d[8],a[8];
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unsigned int isp,srh,ccr,xc,pc,irq,sr;
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int (*IrqCallback) (int nIrq);
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unsigned int ppc;
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void *pResetCallback;
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unsigned int sfc,dfc,usp,vbr;
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unsigned int AsmBank,CpuVersion;
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};
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struct A68KContext M68000_regs;
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extern int m68k_ICount;
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#define SekCyclesLeft m68k_ICount
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#define SekSetCyclesLeft(c) m68k_ICount=c
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#define SekPc M68000_regs.pc
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#endif
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#ifdef EMU_M68K
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#include "../cpu/musashi/m68kcpu.h"
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extern m68ki_cpu_core PicoM68kCPU; // MD's CPU
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extern m68ki_cpu_core PicoS68kCPU; // Mega CD's CPU
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#ifndef SekCyclesLeft
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#define SekCyclesLeftNoMCD PicoM68kCPU.cyc_remaining_cycles
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#define SekCyclesLeft \
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(((PicoMCD&1) && (PicoOpt & 0x2000)) ? (SekCycleAim-SekCycleCnt) : SekCyclesLeftNoMCD)
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#define SekCyclesLeftS68k \
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((PicoOpt & 0x2000) ? (SekCycleAimS68k-SekCycleCntS68k) : PicoS68kCPU.cyc_remaining_cycles)
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#define SekSetCyclesLeftNoMCD(c) SET_CYCLES(c)
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#define SekSetCyclesLeft(c) { \
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if ((PicoMCD&1) && (PicoOpt & 0x2000)) SekCycleCnt=SekCycleAim-(c); else SET_CYCLES(c); \
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}
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#define SekPc m68k_get_reg(&PicoM68kCPU, M68K_REG_PC)
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#define SekPcS68k m68k_get_reg(&PicoS68kCPU, M68K_REG_PC)
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#define SekSetStop(x) { \
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if(x) { SET_CYCLES(0); PicoM68kCPU.stopped=STOP_LEVEL_STOP; } \
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else PicoM68kCPU.stopped=0; \
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}
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#define SekSetStopS68k(x) { \
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if(x) { SET_CYCLES(0); PicoS68kCPU.stopped=STOP_LEVEL_STOP; } \
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else PicoS68kCPU.stopped=0; \
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}
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#endif
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#endif
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extern int SekCycleCnt; // cycles done in this frame
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extern int SekCycleAim; // cycle aim
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extern unsigned int SekCycleCntT; // total cycle counter, updated once per frame
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#define SekCyclesReset() {SekCycleCntT+=SekCycleCnt;SekCycleCnt=SekCycleAim=0;}
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#define SekCyclesBurn(c) SekCycleCnt+=c
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#define SekCyclesDone() (SekCycleAim-SekCyclesLeft) // nuber of cycles done in this frame (can be checked anywhere)
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#define SekCyclesDoneT() (SekCycleCntT+SekCyclesDone()) // total nuber of cycles done for this rom
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#define SekEndRun(after) { \
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SekCycleCnt -= SekCyclesLeft - after; \
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if(SekCycleCnt < 0) SekCycleCnt = 0; \
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SekSetCyclesLeft(after); \
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}
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extern int SekCycleCntS68k;
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extern int SekCycleAimS68k;
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#define SekCyclesResetS68k() {SekCycleCntS68k=SekCycleAimS68k=0;}
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#define SekCyclesDoneS68k() (SekCycleAimS68k-SekCyclesLeftS68k)
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// does not work as expected
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//extern int z80ExtraCycles; // extra z80 cycles, used when z80 is [en|dis]abled
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extern int PicoMCD;
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// ---------------------------------------------------------
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// main oscillator clock which controls timing
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#define OSC_NTSC 53693100
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#define OSC_PAL 53203424 // not accurate
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struct PicoVideo
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{
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unsigned char reg[0x20];
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unsigned int command; // 32-bit Command
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unsigned char pending; // 1 if waiting for second half of 32-bit command
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unsigned char type; // Command type (v/c/vsram read/write)
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unsigned short addr; // Read/Write address
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int status; // Status bits
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unsigned char pending_ints; // pending interrupts: ??VH????
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unsigned char pad[0x13];
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};
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struct PicoMisc
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{
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unsigned char rotate;
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unsigned char z80Run;
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unsigned char padTHPhase[2]; // phase of gamepad TH switches
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short scanline; // 0 to 261||311; -1 in fast mode
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char dirtyPal; // Is the palette dirty (1 - change @ this frame, 2 - some time before)
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unsigned char hardware; // Hardware value for country
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unsigned char pal; // 1=PAL 0=NTSC
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unsigned char sram_reg; // SRAM mode register. bit0: allow read? bit1: deny write? bit2: EEPROM? bit4: detected? (header or by access)
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unsigned short z80_bank68k;
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unsigned short z80_lastaddr; // this is for Z80 faking
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unsigned char z80_fakeval;
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unsigned char pad0;
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unsigned char padDelay[2]; // gamepad phase time outs, so we count a delay
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unsigned short sram_addr; // EEPROM address register
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unsigned char sram_cycle; // EEPROM SRAM cycle number
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unsigned char sram_slave; // EEPROM slave word for X24C02 and better SRAMs
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unsigned char prot_bytes[2]; // simple protection faking
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unsigned short dma_bytes; //
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unsigned char pad[2];
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unsigned int frame_count; // mainly for movies
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};
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// some assembly stuff depend on these, do not touch!
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struct Pico
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{
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unsigned char ram[0x10000]; // 0x00000 scratch ram
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unsigned short vram[0x8000]; // 0x10000
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unsigned char zram[0x2000]; // 0x20000 Z80 ram
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unsigned char ioports[0x10];
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unsigned int pad[0x3c]; // unused
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unsigned short cram[0x40]; // 0x22100
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unsigned short vsram[0x40]; // 0x22180
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unsigned char *rom; // 0x22200
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unsigned int romsize; // 0x22204
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struct PicoMisc m;
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struct PicoVideo video;
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};
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// sram
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struct PicoSRAM
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{
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unsigned char *data; // actual data
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unsigned int start; // start address in 68k address space
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unsigned int end;
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unsigned char resize; // 0c: 1=SRAM size changed and needs to be reallocated on PicoReset
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unsigned char reg_back; // copy of Pico.m.sram_reg to set after reset
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unsigned char changed;
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unsigned char pad;
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};
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// MCD
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#include "cd/cd_sys.h"
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#include "cd/LC89510.h"
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#include "cd/gfx_cd.h"
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struct mcd_pcm
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{
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unsigned char control; // reg7
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unsigned char enabled; // reg8
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unsigned char cur_ch;
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unsigned char bank;
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int pad1;
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struct pcm_chan // 08, size 0x10
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{
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unsigned char regs[8];
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unsigned int addr; // .08: played sample address
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int pad;
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} ch[8];
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};
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struct mcd_misc
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{
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unsigned short hint_vector;
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unsigned char busreq;
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unsigned char s68k_pend_ints;
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unsigned int state_flags; // 04: emu state: reset_pending, dmna_pending
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unsigned int counter75hz;
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unsigned short audio_offset; // 0c: for savestates: play pointer offset (0-1023)
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unsigned char audio_track; // playing audio track # (zero based)
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char pad1;
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int timer_int3; // 10
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unsigned int timer_stopwatch;
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int pad[10];
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};
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typedef struct
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{
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unsigned char bios[0x20000]; // 000000: 128K
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union { // 020000: 512K
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unsigned char prg_ram[0x80000];
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unsigned char prg_ram_b[4][0x20000];
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};
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union { // 0a0000: 256K
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struct {
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unsigned char word_ram2M[0x40000];
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unsigned char unused[0x20000];
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};
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struct {
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unsigned char unused[0x20000];
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unsigned char word_ram1M[2][0x20000];
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};
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};
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union { // 100000: 64K
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unsigned char pcm_ram[0x10000];
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unsigned char pcm_ram_b[0x10][0x1000];
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};
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unsigned char s68k_regs[0x200]; // 110000: GA, not CPU regs
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unsigned char bram[0x2000]; // 110200: 8K
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struct mcd_misc m; // 112200: misc
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struct mcd_pcm pcm; // 112240:
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_scd_toc TOC; // not to be saved
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CDD cdd;
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CDC cdc;
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_scd scd;
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Rot_Comp rot_comp;
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} mcd_state;
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#define Pico_mcd ((mcd_state *)Pico.rom)
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// Area.c
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int PicoAreaPackCpu(unsigned char *cpu, int is_sub);
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int PicoAreaUnpackCpu(unsigned char *cpu, int is_sub);
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// cd/Area.c
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int PicoCdSaveState(void *file);
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int PicoCdLoadState(void *file);
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int PicoCdLoadStateGfx(void *file);
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// Draw.c
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int PicoLine(int scan);
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void PicoFrameStart();
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// Draw2.c
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void PicoFrameFull();
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// Memory.c
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int PicoInitPc(unsigned int pc);
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unsigned int CPU_CALL PicoRead32(unsigned int a);
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void PicoMemSetup();
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void PicoMemReset();
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//void PicoDasm(int start,int len);
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unsigned char z80_read(unsigned short a);
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unsigned short z80_read16(unsigned short a);
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void z80_write(unsigned char data, unsigned short a);
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void z80_write16(unsigned short data, unsigned short a);
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// cd/Memory.c
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void PicoMemSetupCD(void);
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void PicoMemResetCD(int r3);
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void PicoMemResetCDdecode(int r3);
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unsigned char PicoReadCD8 (unsigned int a);
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unsigned short PicoReadCD16(unsigned int a);
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unsigned int PicoReadCD32(unsigned int a);
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void PicoWriteCD8 (unsigned int a, unsigned char d);
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void PicoWriteCD16(unsigned int a, unsigned short d);
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void PicoWriteCD32(unsigned int a, unsigned int d);
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// Pico.c
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extern struct Pico Pico;
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extern struct PicoSRAM SRam;
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extern int emustatus;
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extern int z80startCycle, z80stopCycle; // in 68k cycles
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int CheckDMA(void);
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// cd/Pico.c
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int PicoInitMCD(void);
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void PicoExitMCD(void);
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int PicoResetMCD(int hard);
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// Sek.c
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int SekInit(void);
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int SekReset(void);
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int SekInterrupt(int irq);
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void SekState(unsigned char *data);
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void SekSetRealTAS(int use_real);
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// cd/Sek.c
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int SekInitS68k(void);
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int SekResetS68k(void);
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int SekInterruptS68k(int irq);
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// sound/sound.c
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extern int PsndLen_exc_cnt;
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extern int PsndLen_exc_add;
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// VideoPort.c
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void PicoVideoWrite(unsigned int a,unsigned short d);
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unsigned int PicoVideoRead(unsigned int a);
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// Misc.c
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void SRAMWriteEEPROM(unsigned int d);
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unsigned int SRAMReadEEPROM();
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void SRAMUpdPending(unsigned int a, unsigned int d);
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void memcpy16(unsigned short *dest, unsigned short *src, int count);
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void memcpy16bswap(unsigned short *dest, void *src, int count);
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void memcpy32(int *dest, int *src, int count);
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void memset32(int *dest, int c, int count);
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// cd/Misc.c
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void wram_2M_to_1M(unsigned char *m);
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void wram_1M_to_2M(unsigned char *m);
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#ifdef __cplusplus
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} // End of extern "C"
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#endif
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