source: xtideuniversalbios/trunk/Serial_Server/library/Image.cpp@ 342

//======================================================================
//
// Project:     XTIDE Universal BIOS, Serial Port Server
//
// File:        image.cpp - Abstract base class for disk image support
//

#include "library.h"
#include <memory.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>

struct floppyInfo floppyInfos[] = 
{
    { 1, 2949120 / 512, 6, 80, 2, 36 },         // 2.88MB 3.5"
    { 0, 2867200 / 512, 6, 80, 2, 36 },         // 2.88MB 3.5" (alternate spelling with 2.8)
    { 0, 2969600 / 512, 6, 80, 2, 36 },         // 2.88MB 3.5" (alternate spelling with 2.9)
    { 1, 1474560 / 512, 4, 80, 2, 18 },         // 1.44MB 3.5"
    { 0, 1433600 / 512, 4, 80, 2, 18 },         // 1.44MB 3.5" (alternate spelling with 1.4)
    { 1, 1228800 / 512, 2, 80, 2, 15 },         // 1.2MB 5.25"
    { 1, 737280 / 512, 3, 80, 1, 18 },          // 720KB 3.5"
    { 1, 368640 / 512, 1, 40, 2, 9 },           // 360KB 5.25"
    { 1, 327680 / 512, 0, 40, 2, 8 },           // 320KB 5.25"
    { 1, 184320 / 512, 0, 40, 1, 9 },           // 180KB 5.25" single sided
    { 1, 163840 / 512, 0, 40, 1, 8 },           // 160KB 5.25" single sided
    { 0, 0, 0, 0, 0, 0 }
};

struct floppyInfo *FindFloppyInfoBySize( double size )
{
    struct floppyInfo *fi;

    for( fi = floppyInfos; fi->size != 0 && !(size+5 > fi->size && size-5 < fi->size); fi++ ) ;

    if( fi->size == 0 )
        fi = NULL;

    return( fi );
}

void flipEndian( unsigned short *buff, unsigned int len )
{
    for( unsigned int t = 0; t < len/2; t++ )
        buff[t] = (buff[t] & 0xff) << 8 | (buff[t] & 0xff00) >> 8;
}

Image::Image( char *name, int p_readOnly, int p_drive )
{
}

Image::Image( char *name, int p_readOnly, int p_drive, int p_create, unsigned long p_lba )
{
}

Image::Image( char *name, int p_readOnly, int p_drive, int p_create, unsigned long p_cyl, unsigned long p_head, unsigned long p_sect, int p_useCHS )
{
}

void Image::init( char *name, int p_readOnly, int p_drive, unsigned long p_cyl, unsigned long p_head, unsigned long p_sect, int p_useCHS )
{
    double sizef;
    char sizeChar;
    struct floppyInfo *f;

    for( char *c = shortFileName = name; *c; c++ )
        if( *c == '\\' || *c == '/' || *c == ':' )
            shortFileName = c+1;

    if( *(shortFileName) == 0 )
    {
        log( 1, "Can't parse '%s' for short file name\n\n", name );
        shortFileName = "SerDrive";
    }
  
    readOnly = p_readOnly;
    drive = p_drive;

    if( totallba > 0xfffffff )     // lba28 limit - 28 bits
        log( -1, "'%s', Image size larger than LBA28 maximum of 137,438,952,960 bytes, %lu", name, totallba );

    if( totallba == 0 )
        log( -1, "'%s', Image size zero?" );

    floppy = 0;
    for( f = floppyInfos; f->size && !(f->size == totallba && f->real); f++ ) ;
    if( f->size )
    {
        floppy = 1;
        floppyType = f->type;
        p_useCHS = 1;
        p_cyl = f->cylinders;
        p_head = f->heads;
        p_sect = f->sectors;
        totallba = p_cyl * p_head * p_sect;
    }

    if( p_useCHS )
    {
        if( p_cyl )
        {
            if( p_sect > 63 || (p_head > 16 || p_head < 1) || (p_cyl > 1024 || p_cyl < 1) )
                log( -1, "'%s', parts of the CHS geometry (%lu:%lu:%lu) are out of the range (1-1024:1-16:1-63)", name, p_cyl, p_head, p_sect );
            else if( totallba != (p_sect * p_head * p_cyl) )
                log( -1, "'%s', file size does not match geometry", name );
            sect = p_sect;
            head = p_head;
            cyl = p_cyl;
        }
        else
        {
            if( (totallba % 16) != 0 || ((totallba/16) % 63) != 0 )
                log( -1, "'%s', file size does not match standard CHS geometry (x:16:63), please specify geometry explicitly with -g", name );
            else
            {
                sect = 63;
                head = 16;
                cyl = (totallba / sect / head);
                if( cyl > 1024 )
                    log( -1, "'%s', CHS geometry of %lu:%lu:%lu is larger than maximum values 1024:16:63", name, cyl, head, sect );
            }
        }
    }
    else
    {
        sect = 0;
        head = 0;
        cyl = 0;
    }
    useCHS = p_useCHS;

    sizef = totallba/2048.0;
    sizeChar = 'M';
    if( sizef < 1 ) 
    {
        sizef *= 1024;
        sizeChar = 'K';
    }
    if( useCHS )
        log( 0, "%s: %s with CHS geometry %u:%u:%u, size %.2lf %cB",
             name, (floppy ? "Floppy Disk" : "Hard Disk"), cyl, head, sect, sizef, sizeChar );
    else
        log( 0, "%s: %s with total sectors %lu, size %.2lf %cB", 
             name, (floppy ? "Floppy Disk" : "Hard Disk"), totallba, sizef, sizeChar );
}

int Image::parseGeometry( char *str, unsigned long *p_cyl, unsigned long *p_head, unsigned long *p_sect )
{
    char *c, *s, *h;
    unsigned long cyl, sect, head;

    c = str;
    for( h = c; *h && *h != ':' && *h != 'x' && *h != 'X'; h++ ) ;
    if( !*h )
        return( 0 );

    *h = '\0';
    h++;
    for( s = h+1; *s && *s != ':' && *s != 'x' && *s != 'X'; s++ ) ; 
    if( !*s )
        return( 0 );

    *s = '\0';
    s++;

    cyl = atol(c);
    head = atol(h);
    sect = atol(s);

    if( cyl == 0 || sect == 0 || head == 0 )
        return( 0 );

    *p_cyl = cyl;
    *p_head = head;
    *p_sect = sect;

    return( 1 );
}

#define ATA_wGenCfg 0
#define ATA_wCylCnt 1
#define ATA_wHeadCnt 3
#define ATA_wBpTrck 4
#define ATA_wBpSect 5
#define ATA_wSPT 6

#define ATA_strSerial 10
#define ATA_strSerial_Length 20

#define ATA_strFirmware 23
#define ATA_strFirmware_Length 8

#define ATA_strModel 27
#define ATA_strModel_Length 40                 // Maximum allowable length of the string according to the ATA spec
#define XTIDEBIOS_strModel_Length 30           // Maximum length copied out of the ATA information by the BIOS

#define ATA_wCaps 49
#define ATA_wCurCyls 54
#define ATA_wCurHeads 55
#define ATA_wCurSPT 56
#define ATA_dwCurSCnt 57
#define ATA_dwLBACnt 60

// Words carved out of the vendor specific area for our use
//
#define ATA_wSerialServerVersion 157
#define ATA_wSerialDriveFlags 158
#define ATA_wSerialPortAndBaud 159

// Defines used in the words above
//
#define ATA_wCaps_LBA 0x200

#define ATA_wGenCfg_FIXED 0x40

// These are all shifted by 1 bit to the right, so that SerialDPT_Finalize can shift them into proper position
// and shift the high order bit into the carry flag to indicate a floppy drive is present.
//
#define ATA_wSerialDriveFlags_Floppy    0x88
#define ATA_wSerialDriveFlags_Present   0x02
#define ATA_wSerialDriveFlags_FloppyType_FieldPosition   4

struct comPorts {
    unsigned long port;
    unsigned char com;
};
struct comPorts supportedComPorts[] = 
{ 
  { 0x3f8, '1' }, 
  { 0x2f8, '2' }, 
  { 0x3e8, '3' }, 
  { 0x2e8, '4' }, 
  { 0x2f0, '5' }, 
  { 0x3e0, '6' }, 
  { 0x2e0, '7' }, 
  { 0x260, '8' },
  { 0x368, '9' },
  { 0x268, 'A' },
  { 0x360, 'B' },
  { 0x270, 'C' },
  { 0, 0 } 
};

void Image::respondInquire( unsigned short *buff, unsigned short originalPortAndBaud, struct baudRate *baudRate, unsigned short port, unsigned char scan )
{
    char formatBuff[ 128 ];
    char speedBuff[ 128 ];

    memset( &buff[0], 0, 514 );

    if( scan )
    {
        unsigned short comPort = 0;
        struct comPorts *cp;

        if( port )
        {
            for( cp = supportedComPorts; cp->port && cp->port != port; cp++ ) ;
            if( cp->port )
                comPort = cp->com;
        }

        if( comPort )
            sprintf( speedBuff, " (COM%c/%s)", comPort, baudRate->display );
        else
            sprintf( speedBuff, " (%s baud)", shortFileName, baudRate->display );

        sprintf( formatBuff, "%.*s%s ", XTIDEBIOS_strModel_Length - strlen(speedBuff), shortFileName, speedBuff );
    }
    else
        sprintf( formatBuff, "%.*s ", XTIDEBIOS_strModel_Length, shortFileName );
    strncpy( (char *) &buff[ATA_strModel], formatBuff, ATA_strModel_Length );
    flipEndian( &buff[ATA_strModel], ATA_strModel_Length );

    strncpy( (char *) &buff[ATA_strSerial], "SerialDrive ", ATA_strSerial_Length );
    flipEndian( &buff[ATA_strSerial], ATA_strSerial_Length );

    sprintf( formatBuff, "%d.%d ", SERIAL_SERVER_MAJORVERSION, SERIAL_SERVER_MINORVERSION );
    strncpy( (char *) &buff[ATA_strFirmware], formatBuff, ATA_strFirmware_Length );
    flipEndian( &buff[ATA_strFirmware], ATA_strFirmware_Length );

    if( useCHS )
    {
        buff[ ATA_wCylCnt ] = cyl;
        buff[ ATA_wHeadCnt ] = head;
        buff[ ATA_wSPT ] = sect;
    }
    else
    {
        buff[ ATA_wCaps ] = ATA_wCaps_LBA;
        buff[ ATA_dwLBACnt ] = (unsigned short) (totallba & 0xffff);
        buff[ ATA_dwLBACnt+1 ] = (unsigned short) (totallba >> 16);
    }

    // We echo back the port and baud that we were called on from the client, 
    // the client then uses this value to finalize the DPT.
    //
    buff[ ATA_wSerialPortAndBaud ] = originalPortAndBaud;

    // In case the client requires a specific server version...
    //
    buff[ ATA_wSerialServerVersion ] = (SERIAL_SERVER_MAJORVERSION << 8) | SERIAL_SERVER_MINORVERSION;

    buff[ ATA_wSerialDriveFlags ] = ATA_wSerialDriveFlags_Present;
    if( floppy )
        buff[ ATA_wSerialDriveFlags ] |= 
            ATA_wSerialDriveFlags_Floppy | (floppyType << ATA_wSerialDriveFlags_FloppyType_FieldPosition);

    // we always set this, so that the bulk of the BIOS will consider this disk as a hard disk
    //
    buff[ ATA_wGenCfg ] = ATA_wGenCfg_FIXED;
}