217 lines
5.9 KiB
C
217 lines
5.9 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include "emu.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/time.h>
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#include "tmeconfig.h"
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#include "m68k.h"
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#include "disp.h"
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#include "iwm.h"
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#include "via.h"
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#include "scc.h"
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#include "rtc.h"
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#include "ncr.h"
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#include "hd.h"
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#include "mouse.h"
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unsigned char *macRom;
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unsigned char *macRam;
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int rom_remap, video_remap=0, audio_remap=0;
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void m68k_instruction() {
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unsigned int pc=m68k_get_reg(NULL, M68K_REG_PC);
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printf("Mon: %x\n", pc);
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int ok=0;
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if (pc < 0x400000) {
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if (rom_remap) {
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ok=1;
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}
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} else if (pc >= 0x400000 && pc<0x500000) {
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ok=1;
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}
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if (!ok) return;
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pc&=0x1FFFF;
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if (pc==0x7DCC) printf("Mon: SCSIReadSectors\n");
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if (pc==0x7E4C) printf("Mon: SCSIReadSectors exit OK\n");
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if (pc==0x7E56) printf("Mon: SCSIReadSectors exit FAIL\n");
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}
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unsigned int m68k_read_memory_8(unsigned int address) {
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unsigned int ret;
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unsigned int pc=m68k_get_reg(NULL, M68K_REG_PC);
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if (address < 0x400000) {
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if (rom_remap) {
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ret=macRom[address & (TME_ROMSIZE-1)];
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} else {
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ret=macRam[address & (TME_RAMSIZE-1)];
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}
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} else if (address >= 0x600000 && address < 0x700000) {
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ret=macRam[(address-0x600000) & (TME_RAMSIZE-1)];
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} else if (address >= 0x400000 && address<0x500000) {
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int romAdr=address-0x400000;
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if (romAdr>=TME_ROMSIZE) {
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printf("PC %x:Huh? Read from ROM mirror (%x)\n", pc, address);
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ret=(address>>12); // ROM checks for same contents at 20000 and 40000 to determine if SCSI is present
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} else {
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ret=macRom[romAdr&(TME_ROMSIZE-1)];
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}
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} else if (address >= 0xE80000 && address < 0xf00000) {
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ret=viaRead((address>>9)&0xf);
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} else if (address >= 0xc00000 && address < 0xe00000) {
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ret=iwmRead((address>>9)&0xf);
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} else if (address >= 0x580000 && address < 0x600000) {
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ret=ncrRead((address>>4)&0x7, (address>>9)&1);
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} else if (address >= 0x800000 && address < 0xC00000) {
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ret=sccRead(address);
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} else {
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printf("PC %x: Read from %x\n", pc, address);
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ret=0xff;
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}
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// printf("Rd %x = %x\n", address, ret);
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return ret;
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}
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void m68k_write_memory_8(unsigned int address, unsigned int value) {
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unsigned int pc=m68k_get_reg(NULL, M68K_REG_PC);
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if (address < 0x400000) {
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if (!rom_remap) macRam[address & (TME_RAMSIZE-1)]=value;
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} else if (address >= 0x600000 && address < 0xA00000) {
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macRam[(address-0x600000) & (TME_RAMSIZE-1)]=value;
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} else if (address >= 0xE80000 && address < 0xf00000) {
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viaWrite((address>>9)&0xf, value);
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} else if (address >= 0xc00000 && address < 0xe00000) {
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iwmWrite((address>>9)&0xf, value);
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} else if (address >= 0x580000 && address < 0x600000) {
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ncrWrite((address>>4)&0x7, (address>>9)&1, value);
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} else if (address >= 0x800000 && address < 0xC00000) {
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sccWrite(address, value);
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// printf("PC %x: Write to %x: %x\n", pc, address, value);
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} else {
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printf("PC %x: Write to %x: %x\n", pc, address, value);
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}
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}
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//Should be called every second.
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void printFps() {
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struct timeval tv;
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static struct timeval oldtv;
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gettimeofday(&tv, NULL);
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if (oldtv.tv_sec!=0) {
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long msec=(tv.tv_sec-oldtv.tv_sec)*1000;
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msec+=(tv.tv_usec-oldtv.tv_usec)/1000;
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printf("Speed: %d%%\n", (int)(100000/msec));
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}
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oldtv.tv_sec=tv.tv_sec;
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oldtv.tv_usec=tv.tv_usec;
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}
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void tmeStartEmu(void *ram, void *rom) {
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int ca1=0, ca2=0;
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int x, m=0, frame=0;
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macRom=rom;
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macRam=ram;
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printf("Clearing ram...\n");
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for (int x=0; x<TME_RAMSIZE; x++) macRam[x]=0;
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rom_remap=1;
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printf("Creating HD and registering it...\n");
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SCSIDevice *hd=hdCreate("hd.img");
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ncrRegisterDevice(6, hd);
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printf("Initializing m68k...\n");
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viaClear(VIA_PORTA, 0x7F);
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viaSet(VIA_PORTA, 0x80);
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viaClear(VIA_PORTA, 0xFF);
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viaSet(VIA_PORTB, (1<<3));
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printf("Initializing m68k...\n");
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m68k_init();
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printf("Setting CPU type and resetting...");
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m68k_set_cpu_type(M68K_CPU_TYPE_68000);
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m68k_pulse_reset();
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printf("Display init...\n");
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dispInit();
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printf("Done! Running.\n");
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while(1) {
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for (x=0; x<8000000/60; x+=10) {
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m68k_execute(10);
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viaStep(1); //should run at 783.36KHz
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m++;
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if (m>=1000) {
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int r=mouseTick();
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if (r&MOUSE_BTN) viaClear(VIA_PORTB, (1<<3)); else viaSet(VIA_PORTB, (1<<3));
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if (r&MOUSE_QXB) viaClear(VIA_PORTB, (1<<4)); else viaSet(VIA_PORTB, (1<<4));
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if (r&MOUSE_QYB) viaClear(VIA_PORTB, (1<<5)); else viaSet(VIA_PORTB, (1<<5));
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sccSetDcd(SCC_CHANA, r&MOUSE_QXA);
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sccSetDcd(SCC_CHANB, r&MOUSE_QYA);
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m=0;
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}
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}
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dispDraw(&macRam[video_remap?TME_SCREENBUF_ALT:TME_SCREENBUF]);
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frame++;
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ca1^=1;
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viaControlWrite(VIA_CA1, ca1);
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if (frame>=60) {
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ca2^=1;
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viaControlWrite(VIA_CA2, ca2);
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rtcTick();
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frame=0;
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printFps();
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}
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}
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}
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void viaIrq(int req) {
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// printf("IRQ %d\n", req);
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m68k_set_irq(req?1:0);
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}
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void sccIrq(int req) {
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// printf("IRQ %d\n", req);
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m68k_set_irq(req?2:0);
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}
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//Mac uses an 68008, which has an external 16-bit bus. Hence, it should be okay to do everything using 16-bit
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//reads/writes.
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unsigned int m68k_read_memory_32(unsigned int address) {
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unsigned int ret;
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ret=m68k_read_memory_16(address)<<16;
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ret|=m68k_read_memory_16(address+2);
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return ret;
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}
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unsigned int m68k_read_memory_16(unsigned int address) {
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unsigned int ret;
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ret=m68k_read_memory_8(address)<<8;
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ret|=m68k_read_memory_8(address+1);
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return ret;
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}
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void m68k_write_memory_32(unsigned int address, unsigned int value) {
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m68k_write_memory_16(address, value>>16);
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m68k_write_memory_16(address+2, value);
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}
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void m68k_write_memory_16(unsigned int address, unsigned int value) {
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m68k_write_memory_8(address, (value>>8)&0xff);
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m68k_write_memory_8(address+1, value&0xff);
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}
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void viaCbPortAWrite(unsigned int val) {
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int oldRomRemap=rom_remap;
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video_remap=(val&(1<<6))?1:0;
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rom_remap=(val&(1<<4))?1:0;
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audio_remap=(val&(1<<3))?1:0;
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if (oldRomRemap!=rom_remap) printf("ROM REMAP %d\n", rom_remap);
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iwmSetHeadSel(val&(1<<5));
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}
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void viaCbPortBWrite(unsigned int val) {
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int b;
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b=rtcCom(val&4, val&1, val&2);
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if (b) viaSet(VIA_PORTB, 1); else viaClear(VIA_PORTB, 1);
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}
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