void BIOS_Init()
{
Mem_rStosb(0x400, 0, 0x200); // Clear the Bios Data Area (0x400-0x5ff, 0x600- is accounted to DOS)
// Setup all the interrupt handlers the Bios controls
CALLBACK_SetupExtra(0, CB_IRQ0, dWord2Ptr(BIOS_DEFAULT_IRQ0_LOCATION));
RealSetVec(0x08, BIOS_DEFAULT_IRQ0_LOCATION);
BIOS_HostTimeSync(); // Initialize the timer ticks
CALLBACK_Install(0x11, &INT11_Handler, CB_IRET); // INT 11 Get equipment list
CALLBACK_Install(0x12, &INT12_Handler, CB_IRET); // INT 12 Memory size default at 640 kb
Mem_Stosw(BIOS_MEMORY_SIZE, 640);
CALLBACK_Install(0x13, &INT13_DiskHandler, CB_IRET_STI); // INT 13 BIOS Disk support
Mem_Stosb(BIOS_HARDDISK_COUNT, 2); // Setup the Bios Area
CALLBACK_Install(0x14, &INT14_Handler, CB_IRET_STI); // INT 14 Serial ports
CALLBACK_Install(0x15, &INT15_Handler, CB_IRET_STI); // INT 15 Misc calls
BIOS_SetupKeyboard(); // INT 16 Keyboard handled in another file
CALLBACK_Install(0x17, &INT17_Handler, CB_IRET_STI); // INT 17 Printer Routines
CALLBACK_Install(0x1a, &INT1A_Handler, CB_IRET_STI); // INT 1A Time and some other functions
// These are already setup as dummy by CALLBACK_Init()
// CALLBACK_SetupDummyIRET(0x1c); // INT 1C System timer tick called from INT 8
// CALLBACK_Install(0x71, NULL, CB_IRQ9); // Irq 9 rerouted to irq 2
// CALLBACK_SetupDummyIRET(0x18); // Reboot dummies
// CALLBACK_SetupDummyIRET(0x19);
// set system BIOS entry point too
Mem_aStosb(0xffff0, 0xEA); // FAR JMP
Mem_aStosd(0xffff1, Mem_Lodsd(0x18*4));
Bitu cbID = CALLBACK_Allocate(); // Irq 2
CALLBACK_Setup(cbID, NULL, CB_IRET_EOI_PIC1, dWord2Ptr(BIOS_DEFAULT_IRQ2_LOCATION));
RealSetVec(0x0a, BIOS_DEFAULT_IRQ2_LOCATION);
Mem_aStosb(BIOS_DEFAULT_HANDLER_LOCATION, 0xcf); // BIOS default interrupt vector location -> IRET
Mem_aWrites(0xfff00, "vDos BIOS", 9); // System BIOS identification
Mem_aWrites(0xffff5, "01/01/99\x00\xfc\x24", 11); // System BIOS date + signature
for (Bitu i = BIOS_COM1_TIMEOUT; i <= BIOS_COM4_TIMEOUT; i++) // Port timeouts
Mem_Stosb(i, 1);
}
Bit8u DOS_FCBRead(Bit16u seg, Bit16u offset, Bit16u recno)
{
DOS_FCB fcb(seg, offset);
Bit8u fhandle, cur_rec;
Bit16u cur_block, rec_size;
fcb.GetSeqData(fhandle, rec_size);
fcb.GetRecord(cur_block, cur_rec);
Bit32u pos = ((cur_block*128)+cur_rec)*rec_size;
if (!DOS_SeekFile(fhandle, &pos, DOS_SEEK_SET))
return FCB_READ_NODATA;
Bit16u toread = rec_size;
if (!DOS_ReadFile(fhandle, dos_copybuf, &toread) || toread == 0)
return FCB_READ_NODATA;
if (toread < rec_size) // Zero pad copybuffer to rec_size
memset(dos_copybuf+toread, 0, rec_size-toread);
vPC_rBlockWrite(dWord2Ptr(dos.dta())+recno*rec_size, dos_copybuf, rec_size);
if (++cur_rec > 127)
{
cur_block++;
cur_rec = 0;
}
fcb.SetRecord(cur_block, cur_rec);
if (toread == rec_size)
return FCB_SUCCESS;
return FCB_READ_PARTIAL;
}
static Bitu default_handler(void)
{
LOG_MSG("Unhandled interrupt called: %2X", lastint);
Bit32u addr = (Bit32u)MemBase+4*0x0e;
LOG_MSG("0:4xe: %x", *(Bit32u*)addr);
addr = dWord2Ptr(*(Bit32u*)addr);
LOG_MSG("addr: %x, val: %x", addr, *(Bit32u*)(MemBase+addr));
return CBRET_NONE;
}
Bit8u DOS_FCBWrite(Bit16u seg, Bit16u offset, Bit16u recno)
{
DOS_FCB fcb(seg, offset);
Bit8u fhandle, cur_rec;
Bit16u cur_block, rec_size;
fcb.GetSeqData(fhandle, rec_size);
fcb.GetRecord(cur_block, cur_rec);
Bit32u pos=((cur_block*128)+cur_rec)*rec_size;
if (!DOS_SeekFile(fhandle, &pos, DOS_SEEK_SET))
return FCB_ERR_WRITE;
vPC_rBlockRead(dWord2Ptr(dos.dta())+recno*rec_size, dos_copybuf, rec_size);
Bit16u towrite = rec_size;
if (!DOS_WriteFile(fhandle, dos_copybuf, &towrite))
return FCB_ERR_WRITE;
Bit32u size;
Bit16u date, time;
fcb.GetSizeDateTime(size, date, time);
if (pos+towrite > size)
size = pos+towrite;
date = DOS_PackDate(dos.date.year, dos.date.month, dos.date.day); // Ttime doesn't keep track of endofday
Bit32u ticks = vPC_rLodsd(BIOS_TIMER);
Bit32u seconds = (ticks*10)/182;
Bit16u hour = (Bit16u)(seconds/3600);
Bit16u min = (Bit16u)((seconds % 3600)/60);
Bit16u sec = (Bit16u)(seconds % 60);
time = DOS_PackTime(hour, min, sec);
Bit8u temp = RealHandle(fhandle);
Files[temp]->time = time;
Files[temp]->date = date;
fcb.SetSizeDateTime(size, date, time);
if (++cur_rec > 127)
{
cur_block++;
cur_rec = 0;
}
fcb.SetRecord(cur_block, cur_rec);
return FCB_SUCCESS;
}
