void bootstrap1()
{
/*
* Try and read the first sector off the diskette
*/
setAH(2); /* read */
setAL(1); /* 1 block */
#ifdef SECURE
if ((IBOOL) config_inquire(C_SECURE, NULL))
{
setDH(0); /* Head 0 */
setDL(0x80); /* on Hard Disk */
}
else
{
setDX(0); /* head 0 on drive 0 (floppy)*/
}
#else
setDX(0); /* head 0 on drive 0 (floppy)*/
#endif
setCX(1); /* track 0, sector 1 */
setES(DOS_SEGMENT); /* Load address */
setBX(DOS_OFFSET);
}
void bootstrap2()
{
/*
* If the Carry Flag is set then the previous read failed and we go and
* try the hard disk.
*/
if (getCF())
{
/*
* Load up the registers to call the disk routine that will load
* the first sector of DOS into memory. This ALWAYS resides on the
* first sector of the disk.
*/
setAH(2); /* Read sector */
setAL(1); /* 1 block */
setCH(0); /* Cylinder 0 */
setCL(1); /* Sector 1 */
setDH(0); /* Head 0 */
setDL(0x80); /* Hard disk */
setES(DOS_SEGMENT); /* Load address */
setBX(DOS_OFFSET);
}
}
/*static*/
VOID WINAPI BiosDiskService(LPWORD Stack)
{
BYTE Drive;
PDISK_IMAGE DiskImage;
switch (getAH())
{
/* Disk -- Reset Disk System */
case 0x00:
{
Drive = getDL();
if (Drive & 0x80)
{
AllDisksReset();
/* Return success */
setAH(0x00);
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
break;
}
Drive &= ~0x80;
if (Drive >= ARRAYSIZE(FloppyDrive))
{
DPRINT1("BiosDiskService(0x00): Drive number 0x%02X invalid\n", Drive);
/* Return error */
setAH(0x01);
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
break;
}
// TODO: Reset drive
/* Return success */
setAH(0x00);
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
break;
}
/* Disk -- Get Status of Last Operation */
case 0x01:
{
BYTE LastOperationStatus = 0x00;
Drive = getDL();
DiskImage = GetDisk(Drive);
if (!DiskImage || !IsDiskPresent(DiskImage))
{
DPRINT1("BiosDiskService(0x01): Disk number 0x%02X invalid\n", Drive);
/* Return error */
setAH(0x01);
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
break;
}
LastOperationStatus = DiskImage->LastOperationStatus;
if (Drive & 0x80)
Bda->LastDiskOperation = LastOperationStatus;
else
Bda->LastDisketteOperation = LastOperationStatus;
/* Return last error */
setAH(LastOperationStatus);
if (LastOperationStatus == 0x00)
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
else
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
break;
}
/* Disk -- Read Sectors into Memory */
case 0x02:
{
BYTE Status;
BYTE Head = getDH();
BYTE NumSectors = getAL();
// CH: Low eight bits of cylinder number
// CL: High two bits of cylinder (bits 6-7, hard disk only)
WORD Cylinder = MAKEWORD(getCH(), (getCL() >> 6) & 0x02);
// CL: Sector number 1-63 (bits 0-5)
BYTE Sector = (getCL() & 0x3F); // 1-based
Drive = getDL();
DiskImage = GetDisk(Drive);
if (!DiskImage || !IsDiskPresent(DiskImage))
{
DPRINT1("BiosDiskService(0x02): Disk number 0x%02X invalid\n", Drive);
/* Return error */
setAH(0x01);
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
break;
}
/* Read the sectors */
Status = ReadDisk(DiskImage, Cylinder, Head, Sector, NumSectors);
if (Status == 0x00)
{
/* Return success */
setAH(0x00);
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
}
else
{
DPRINT1("BiosDiskService(0x02): Error when reading from disk number 0x%02X (0x%02X)\n", Drive, Status);
/* Return error */
setAH(Status);
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
}
break;
}
/* Disk -- Write Disk Sectors */
case 0x03:
{
BYTE Status;
BYTE Head = getDH();
BYTE NumSectors = getAL();
// CH: Low eight bits of cylinder number
// CL: High two bits of cylinder (bits 6-7, hard disk only)
WORD Cylinder = MAKEWORD(getCH(), (getCL() >> 6) & 0x02);
// CL: Sector number 1-63 (bits 0-5)
BYTE Sector = (getCL() & 0x3F); // 1-based
Drive = getDL();
DiskImage = GetDisk(Drive);
if (!DiskImage || !IsDiskPresent(DiskImage))
{
DPRINT1("BiosDiskService(0x03): Disk number 0x%02X invalid\n", Drive);
/* Return error */
setAH(0x01);
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
break;
}
/* Write the sectors */
Status = WriteDisk(DiskImage, Cylinder, Head, Sector, NumSectors);
if (Status == 0x00)
{
/* Return success */
setAH(0x00);
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
}
else
{
DPRINT1("BiosDiskService(0x03): Error when writing to disk number 0x%02X (0x%02X)\n", Drive, Status);
/* Return error */
setAH(Status);
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
}
break;
}
/* Disk -- Verify Disk Sectors */
case 0x04:
/* Floppy/Fixed Disk -- Format Track */
case 0x05:
/* Fixed Disk -- Format Track and Set Bad Sector Flags */
case 0x06:
/* Fixed Disk -- Format Drive starting at Given Track */
case 0x07:
goto Default;
/* Disk -- Get Drive Parameters */
case 0x08:
{
WORD MaxCylinders;
BYTE MaxHeads;
BYTE PresentDrives = 0;
BYTE i;
Drive = getDL();
DiskImage = GetDisk(Drive);
if (!DiskImage || !IsDiskPresent(DiskImage))
{
DPRINT1("BiosDiskService(0x08): Disk number 0x%02X invalid\n", Drive);
/* Return error */
setAH(0x01);
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
break;
}
// Minus 2 because it's the maximum cylinder number (not count),
// and the last cylinder is reserved (for compatibility with BIOSes
// which reserve it for testing purposes).
MaxCylinders = DiskImage->DiskInfo.Cylinders - 2;
// Minus 1 because it's the maximum head number (not count).
MaxHeads = DiskImage->DiskInfo.Heads - 1;
// CL: Sector number 1-63 (bits 0-5)
// High two bits of cylinder (bits 6-7, hard disk only)
setCL((DiskImage->DiskInfo.Sectors & 0x3F) |
((HIBYTE(MaxCylinders) & 0x02) << 6));
// CH: Low eight bits of cylinder number
setCH(LOBYTE(MaxCylinders));
setDH(MaxHeads);
if (Drive & 0x80)
{
/* Count the number of active HDDs */
for (i = 0; i < ARRAYSIZE(HardDrive); ++i)
{
if (IsDiskPresent(HardDrive[i]))
++PresentDrives;
}
/* Reset ES:DI to NULL */
// FIXME: NONONO!! Apps expect (for example, MS-DOS kernel)
// that this function does not modify ES:DI if it was called
// for a HDD.
// setES(0x0000);
// setDI(0x0000);
}
else
{
/* Count the number of active floppies */
for (i = 0; i < ARRAYSIZE(FloppyDrive); ++i)
{
if (IsDiskPresent(FloppyDrive[i]))
++PresentDrives;
}
/* ES:DI points to the floppy parameter table */
setES(HIWORD(((PULONG)BaseAddress)[0x1E]));
setDI(LOWORD(((PULONG)BaseAddress)[0x1E]));
}
setDL(PresentDrives);
setBL(DiskImage->DiskType); // DiskGeometryList[DiskImage->DiskType].biosval
setAL(0x00);
/* Return success */
setAH(0x00);
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
break;
}
/* Hard Disk -- Initialize Controller with Drive Parameters */
case 0x09:
/* Hard Disk -- Read Long Sectors */
case 0x0A:
/* Hard Disk -- Write Long Sectors */
case 0x0B:
goto Default;
/* Hard Disk -- Seek to Cylinder */
case 0x0C:
{
BYTE Status;
BYTE Head = getDH();
// CH: Low eight bits of cylinder number
// CL: High two bits of cylinder (bits 6-7, hard disk only)
WORD Cylinder = MAKEWORD(getCH(), (getCL() >> 6) & 0x02);
// CL: Sector number 1-63 (bits 0-5)
BYTE Sector = (getCL() & 0x3F); // 1-based
Drive = getDL();
if (!(Drive & 0x80))
{
DPRINT1("BiosDiskService(0x0C): Disk number 0x%02X is not a HDD\n", Drive);
/* Return error */
setAH(0x01);
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
break;
}
DiskImage = GetDisk(Drive);
if (!DiskImage || !IsDiskPresent(DiskImage))
{
DPRINT1("BiosDiskService(0x0C): Disk number 0x%02X invalid\n", Drive);
/* Return error */
setAH(0x01);
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
break;
}
/* Set position */
Status = SeekDisk(DiskImage, Cylinder, Head, Sector);
if (Status == 0x00)
{
/* Return success */
setAH(0x00);
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
}
else
{
DPRINT1("BiosDiskService(0x0C): Error when seeking in disk number 0x%02X (0x%02X)\n", Drive, Status);
/* Return error */
setAH(Status);
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
}
break;
}
/* Hard Disk -- Reset Hard Disks */
case 0x0D:
{
// FIXME: Should do what 0x11 does.
UNIMPLEMENTED;
}
/* Hard Disk -- Read Sector Buffer (XT only) */
case 0x0E:
/* Hard Disk -- Write Sector Buffer (XT only) */
case 0x0F:
goto Default;
/* Hard Disk -- Check if Drive is ready */
case 0x10:
{
Drive = getDL();
if (!(Drive & 0x80))
{
DPRINT1("BiosDiskService(0x10): Disk number 0x%02X is not a HDD\n", Drive);
/* Return error */
setAH(0x01);
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
break;
}
DiskImage = GetDisk(Drive);
if (!DiskImage || !IsDiskPresent(DiskImage))
{
DPRINT1("BiosDiskService(0x10): Disk number 0x%02X invalid\n", Drive);
/* Return error */
setAH(0x01);
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
break;
}
/* Return success */
setAH(0x00);
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
break;
}
/* Hard Disk -- Recalibrate Drive */
case 0x11:
{
BYTE Status;
Drive = getDL();
if (!(Drive & 0x80))
{
DPRINT1("BiosDiskService(0x11): Disk number 0x%02X is not a HDD\n", Drive);
/* Return error */
setAH(0x01);
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
break;
}
DiskImage = GetDisk(Drive);
if (!DiskImage || !IsDiskPresent(DiskImage))
{
DPRINT1("BiosDiskService(0x11): Disk number 0x%02X invalid\n", Drive);
/* Return error */
setAH(0x01);
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
break;
}
/* Set position to zero */
Status = SeekDisk(DiskImage, /*Cylinder*/ 0, /*Head*/ 0, /*Sector*/ 1);
if (Status == 0x00)
{
/* Return success */
setAH(0x00);
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
}
else
{
DPRINT1("BiosDiskService(0x11): Error when recalibrating disk number 0x%02X (0x%02X)\n", Drive, Status);
/* Return error */
setAH(Status);
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
}
break;
}
/* Hard Disk -- Controller RAM Diagnostic */
case 0x12:
/* Hard Disk -- Drive Diagnostic */
case 0x13:
/* Hard Disk -- Controller Internal Diagnostic */
case 0x14:
goto Default;
/* Disk -- Get Disk Type */
case 0x15:
{
Drive = getDL();
DiskImage = GetDisk(Drive);
if (!DiskImage || !IsDiskPresent(DiskImage))
{
DPRINT1("BiosDiskService(0x15): Disk number 0x%02X invalid\n", Drive);
/* Return error */
setAH(0x01);
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
break;
}
if (Drive & 0x80)
{
ULONG NumSectors;
/* Hard disk */
setAH(0x03);
/* Number of 512-byte sectors in CX:DX */
NumSectors = (ULONG)((ULONG)DiskImage->DiskInfo.Cylinders * DiskImage->DiskInfo.Heads)
* DiskImage->DiskInfo.Sectors;
setCX(HIWORD(NumSectors));
setDX(LOWORD(NumSectors));
}
else
{
/* Floppy */
setAH(0x01);
}
/* Return success */
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
break;
}
/* Floppy Disk -- Detect Disk Change */
case 0x16:
/* Floppy Disk -- Set Disk Type for Format */
case 0x17:
/* Disk -- Set Media Type for Format */
case 0x18:
goto Default;
default: Default:
{
DPRINT1("BIOS Function INT 13h, AH = 0x%02X, AL = 0x%02X, BH = 0x%02X NOT IMPLEMENTED\n",
getAH(), getAL(), getBH());
}
}
}