dskbios32.c File Reference

#include "ntvdm.h"
#include <debug.h>
#include "emulator.h"
#include "cpu/cpu.h"
#include "int32.h"
#include "dskbios32.h"
#include "bios32p.h"
#include "hardware/disk.h"

Include dependency graph for dskbios32.c:

Go to the source code of this file.

Classes
struct	_FLOPPY_PARAM_TABLE
struct	_FLOPPY_PARAM_TABLE_EX
struct	_HARDDISK_PARAM_TABLE

Macros
#define	NDEBUG
#define	FLOPPY_SIZE_CODE   0x02
#define	FLOPPY_DATALEN   0xFF
#define	FLOPPY_MOTOR_TICKS   37
#define	FLOPPY_FILLBYTE   0xF6
#define	FLOPPY_GAPLEN   0x1B
#define	FLOPPY_FORMAT_GAPLEN   0x6C

Typedefs
typedef struct _FLOPPY_PARAM_TABLE	FLOPPY_PARAM_TABLE
typedef struct _FLOPPY_PARAM_TABLE *	PFLOPPY_PARAM_TABLE
typedef struct _FLOPPY_PARAM_TABLE_EX	FLOPPY_PARAM_TABLE_EX
typedef struct _FLOPPY_PARAM_TABLE_EX *	PFLOPPY_PARAM_TABLE_EX
typedef struct _HARDDISK_PARAM_TABLE	HARDDISK_PARAM_TABLE
typedef struct _HARDDISK_PARAM_TABLE *	PHARDDISK_PARAM_TABLE

Functions
static PDISK_IMAGE	GetDisk (IN BYTE DiskNumber)
static VOID	AllDisksReset (VOID)
VOID WINAPI	BiosDiskService (LPWORD Stack)
VOID	DiskBios32Post (VOID)
BOOLEAN	DiskBios32Initialize (VOID)
VOID	DiskBios32Cleanup (VOID)

Variables
static PDISK_IMAGE	FloppyDrive [2] = {NULL}
static PDISK_IMAGE	HardDrive [4] = {NULL}
static const FLOPPY_PARAM_TABLE_EX	FloppyParamTable

Macro Definition Documentation

FLOPPY_DATALEN

#define FLOPPY_DATALEN   0xFF

Definition at line 72 of file dskbios32.c.

FLOPPY_FILLBYTE

#define FLOPPY_FILLBYTE   0xF6

Definition at line 74 of file dskbios32.c.

FLOPPY_FORMAT_GAPLEN

#define FLOPPY_FORMAT_GAPLEN   0x6C

Definition at line 76 of file dskbios32.c.

FLOPPY_GAPLEN

#define FLOPPY_GAPLEN   0x1B

Definition at line 75 of file dskbios32.c.

FLOPPY_MOTOR_TICKS

#define FLOPPY_MOTOR_TICKS   37

Definition at line 73 of file dskbios32.c.

FLOPPY_SIZE_CODE

#define FLOPPY_SIZE_CODE   0x02

Definition at line 71 of file dskbios32.c.

NDEBUG

#define NDEBUG

Definition at line 13 of file dskbios32.c.

Typedef Documentation

FLOPPY_PARAM_TABLE

typedef struct _FLOPPY_PARAM_TABLE FLOPPY_PARAM_TABLE

FLOPPY_PARAM_TABLE_EX

typedef struct _FLOPPY_PARAM_TABLE_EX FLOPPY_PARAM_TABLE_EX

HARDDISK_PARAM_TABLE

typedef struct _HARDDISK_PARAM_TABLE HARDDISK_PARAM_TABLE

PFLOPPY_PARAM_TABLE

typedef struct _FLOPPY_PARAM_TABLE * PFLOPPY_PARAM_TABLE

PFLOPPY_PARAM_TABLE_EX

typedef struct _FLOPPY_PARAM_TABLE_EX * PFLOPPY_PARAM_TABLE_EX

PHARDDISK_PARAM_TABLE

typedef struct _HARDDISK_PARAM_TABLE * PHARDDISK_PARAM_TABLE

Function Documentation

AllDisksReset()

static VOID AllDisksReset ( VOID  )

static

Definition at line 157 of file dskbios32.c.

{
    Bda->LastDisketteOperation = 0;
    Bda->LastDiskOperation = 0;
}

Referenced by BiosDiskService(), and DiskBios32Post().

BiosDiskService()

VOID WINAPI BiosDiskService

(

LPWORD

Stack

)

Definition at line 164 of file dskbios32.c.

{
    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());
        }
    }
}

Referenced by BiosBootstrapLoader(), and DiskBios32Post().

DiskBios32Cleanup()

VOID DiskBios32Cleanup

(

VOID

)

Definition at line 701 of file dskbios32.c.

{
}

Referenced by Bios32Cleanup().

DiskBios32Initialize()

BOOLEAN DiskBios32Initialize

(

VOID

)

Definition at line 674 of file dskbios32.c.

{
    /*
     * Initialize BIOS Disk ROM static data
     */
 
    /* Floppy Parameter Table */
    RtlCopyMemory(SEG_OFF_TO_PTR(BIOS_SEGMENT, 0xEFC7),
                  &FloppyParamTable.FloppyParamTable,
                  sizeof(FloppyParamTable.FloppyParamTable));
 
    //
    // FIXME: Must be done by HW floppy controller!
    //
 
    /* Detect and initialize the supported disks */
    // TODO: the "Detect" part is missing.
    FloppyDrive[0] = RetrieveDisk(FLOPPY_DISK, 0);
    FloppyDrive[1] = RetrieveDisk(FLOPPY_DISK, 1);
    HardDrive[0]   = RetrieveDisk(HARD_DISK, 0);
    HardDrive[1]   = RetrieveDisk(HARD_DISK, 1);
    HardDrive[2]   = RetrieveDisk(HARD_DISK, 2);
    HardDrive[3]   = RetrieveDisk(HARD_DISK, 3);
 
    return TRUE;
}

Referenced by Bios32Initialize().

DiskBios32Post()

VOID DiskBios32Post

(

VOID

)

Definition at line 647 of file dskbios32.c.

{
    /*
     * Initialize BIOS Disk RAM dynamic data
     */
 
    /* Some vectors are in fact addresses to tables */
    // Diskette Parameters
    ((PULONG)BaseAddress)[0x1E] = MAKELONG(0xEFC7, BIOS_SEGMENT);
    // Hard Disk 0 Parameter Table Address
    ((PULONG)BaseAddress)[0x41] = NULL32;
    // Hard Disk 1 Drive Parameter Table Address
    ((PULONG)BaseAddress)[0x46] = NULL32;
 
    /* Relocated services by the BIOS (when needed) */
    ((PULONG)BaseAddress)[0x40] = NULL32; // ROM BIOS Diskette Handler relocated by Hard Disk BIOS
    // RegisterBiosInt32(0x40, NULL); // ROM BIOS Diskette Handler relocated by Hard Disk BIOS
 
    /* Register the BIOS 32-bit Interrupts */
    RegisterBiosInt32(BIOS_DISK_INTERRUPT, BiosDiskService);
 
    /* Initialize the BDA */
    // Bda->LastDisketteOperation = 0;
    // Bda->LastDiskOperation = 0;
    AllDisksReset();
}

Referenced by Bios32Post().

GetDisk()

static PDISK_IMAGE GetDisk ( IN BYTE  DiskNumber )

static

Definition at line 130 of file dskbios32.c.

{
    if (DiskNumber & 0x80)
    {
        DiskNumber &= ~0x80;
 
        if (DiskNumber >= ARRAYSIZE(HardDrive))
        {
            DPRINT1("GetDisk: HDD number 0x%02X invalid\n", DiskNumber | 0x80);
            return NULL;
        }
 
        return HardDrive[DiskNumber];
    }
    else
    {
        if (DiskNumber >= ARRAYSIZE(FloppyDrive))
        {
            DPRINT1("GetDisk: Floppy number 0x%02X invalid\n", DiskNumber);
            return NULL;
        }
 
        return FloppyDrive[DiskNumber];
    }
}

Referenced by BiosDiskService().

Variable Documentation

FloppyDrive

PDISK_IMAGE FloppyDrive[2] = {NULL}

static

Definition at line 36 of file dskbios32.c.

Referenced by BiosDiskService(), DiskBios32Initialize(), and GetDisk().

FloppyParamTable

const FLOPPY_PARAM_TABLE_EX FloppyParamTable

static

Initial value:

=
{
    
    {
        0xAF, 
        0x02, 
        FLOPPY_MOTOR_TICKS, 
        FLOPPY_SIZE_CODE,
        18,
        FLOPPY_GAPLEN,
        FLOPPY_DATALEN,
        FLOPPY_FORMAT_GAPLEN,
        FLOPPY_FILLBYTE,
        0x0F, 
        0x08, 
    },
 
    
    79,   
    0,    
    4,    
}

Definition at line 78 of file dskbios32.c.

Referenced by DiskBios32Initialize().

HardDrive

PDISK_IMAGE HardDrive[4] = {NULL}

static

Definition at line 37 of file dskbios32.c.

Referenced by BiosDiskService(), DiskBios32Initialize(), and GetDisk().