void BIOSCALL int13_cdemu(disk_regs_t r)
{
// @TODO: a macro or a function for getting the EBDA segment
uint16_t ebda_seg=read_word(0x0040,0x000E);
uint8_t device, status;
uint16_t vheads, vspt, vcylinders;
uint16_t head, sector, cylinder, nbsectors;
uint32_t vlba, ilba, slba, elba;
uint16_t before, segment, offset;
cdb_atapi atapicmd;
cdemu_t __far *cdemu;
bio_dsk_t __far *bios_dsk;
cdemu = ebda_seg :> &EbdaData->cdemu;
bios_dsk = ebda_seg :> &EbdaData->bdisk;
BX_DEBUG_INT13_ET("%s: AX=%04x BX=%04x CX=%04x DX=%04x ES=%04x\n", __func__, AX, BX, CX, DX, ES);
/* at this point, we are emulating a floppy/harddisk */
// Recompute the device number
device = cdemu->controller_index * 2;
device += cdemu->device_spec;
SET_DISK_RET_STATUS(0x00);
/* basic checks : emulation should be active, dl should equal the emulated drive */
if (!cdemu->active || (cdemu->emulated_drive != GET_DL())) {
BX_INFO("%s: function %02x, emulation not active for DL= %02x\n", __func__, GET_AH(), GET_DL());
goto int13_fail;
}
switch (GET_AH()) {
case 0x00: /* disk controller reset */
if (pktacc[bios_dsk->devices[device].type])
{
status = softrst[bios_dsk->devices[device].type](device);
}
goto int13_success;
break;
// all those functions return SUCCESS
case 0x09: /* initialize drive parameters */
case 0x0c: /* seek to specified cylinder */
case 0x0d: /* alternate disk reset */ // FIXME ElTorito Various. should really reset ?
case 0x10: /* check drive ready */ // FIXME ElTorito Various. should check if ready ?
case 0x11: /* recalibrate */
case 0x14: /* controller internal diagnostic */
case 0x16: /* detect disk change */
goto int13_success;
break;
// all those functions return disk write-protected
case 0x03: /* write disk sectors */
case 0x05: /* format disk track */
SET_AH(0x03);
goto int13_fail_noah;
break;
case 0x01: /* read disk status */
status=read_byte(0x0040, 0x0074);
SET_AH(status);
SET_DISK_RET_STATUS(0);
/* set CF if error status read */
if (status)
goto int13_fail_nostatus;
else
goto int13_success_noah;
break;
case 0x02: // read disk sectors
case 0x04: // verify disk sectors
vspt = cdemu->vdevice.spt;
vcylinders = cdemu->vdevice.cylinders;
vheads = cdemu->vdevice.heads;
ilba = cdemu->ilba;
sector = GET_CL() & 0x003f;
cylinder = (GET_CL() & 0x00c0) << 2 | GET_CH();
head = GET_DH();
nbsectors = GET_AL();
segment = ES;
offset = BX;
BX_DEBUG_INT13_ET("%s: read to %04x:%04x @ VCHS %u/%u/%u (%u sectors)\n", __func__,
ES, BX, cylinder, head, sector, nbsectors);
// no sector to read ?
if(nbsectors==0)
goto int13_success;
// sanity checks sco openserver needs this!
if ((sector > vspt)
|| (cylinder >= vcylinders)
|| (head >= vheads)) {
goto int13_fail;
}
// After validating the input, verify does nothing
if (GET_AH() == 0x04)
goto int13_success;
segment = ES+(BX / 16);
offset = BX % 16;
// calculate the virtual lba inside the image
vlba=((((uint32_t)cylinder*(uint32_t)vheads)+(uint32_t)head)*(uint32_t)vspt)+((uint32_t)(sector-1));
// In advance so we don't lose the count
SET_AL(nbsectors);
// start lba on cd
slba = (uint32_t)vlba / 4;
before = (uint32_t)vlba % 4;
// end lba on cd
elba = (uint32_t)(vlba + nbsectors - 1) / 4;
_fmemset(&atapicmd, 0, sizeof(atapicmd));
atapicmd.command = 0x28; // READ 10 command
atapicmd.lba = swap_32(ilba + slba);
atapicmd.nsect = swap_16(elba - slba + 1);
bios_dsk->drqp.nsect = nbsectors;
bios_dsk->drqp.sect_sz = 512;
bios_dsk->drqp.skip_b = before * 512;
bios_dsk->drqp.skip_a = ((4 - nbsectors % 4 - before) * 512) % 2048;
status = pktacc[bios_dsk->devices[device].type](device, 12, (char __far *)&atapicmd, before*512, nbsectors*512L, ATA_DATA_IN, MK_FP(segment,offset));
bios_dsk->drqp.skip_b = 0;
bios_dsk->drqp.skip_a = 0;
if (status != 0) {
BX_INFO("%s: function %02x, error %02x !\n", __func__, GET_AH(), status);
SET_AH(0x02);
SET_AL(0);
goto int13_fail_noah;
}
goto int13_success;
break;
case 0x08: /* read disk drive parameters */
vspt = cdemu->vdevice.spt;
vcylinders = cdemu->vdevice.cylinders - 1;
vheads = cdemu->vdevice.heads - 1;
SET_AL( 0x00 );
SET_BL( 0x00 );
SET_CH( vcylinders & 0xff );
SET_CL((( vcylinders >> 2) & 0xc0) | ( vspt & 0x3f ));
SET_DH( vheads );
SET_DL( 0x02 ); // FIXME ElTorito Various. should send the real count of drives 1 or 2
// FIXME ElTorito Harddisk. should send the HD count
switch (cdemu->media) {
case 0x01: SET_BL( 0x02 ); break; /* 1.2 MB */
case 0x02: SET_BL( 0x04 ); break; /* 1.44 MB */
case 0x03: SET_BL( 0x05 ); break; /* 2.88 MB */
}
/* Only set the DPT pointer for emulated floppies. */
if (cdemu->media < 4) {
DI = (uint16_t)&diskette_param_table; // @todo: should this depend on emulated medium?
ES = 0xF000; // @todo: how to make this relocatable?
}
goto int13_success;
break;
case 0x15: /* read disk drive size */
// FIXME ElTorito Harddisk. What geometry to send ?
SET_AH(0x03);
goto int13_success_noah;
break;
// all those functions return unimplemented
case 0x0a: /* read disk sectors with ECC */
case 0x0b: /* write disk sectors with ECC */
case 0x18: /* set media type for format */
case 0x41: // IBM/MS installation check
// FIXME ElTorito Harddisk. Darwin would like to use EDD
case 0x42: // IBM/MS extended read
case 0x43: // IBM/MS extended write
case 0x44: // IBM/MS verify sectors
case 0x45: // IBM/MS lock/unlock drive
case 0x46: // IBM/MS eject media
case 0x47: // IBM/MS extended seek
case 0x48: // IBM/MS get drive parameters
case 0x49: // IBM/MS extended media change
case 0x4e: // ? - set hardware configuration
case 0x50: // ? - send packet command
default:
BX_INFO("%s: function AH=%02x unsupported, returns fail\n", __func__, GET_AH());
goto int13_fail;
break;
}
int13_fail:
SET_AH(0x01); // defaults to invalid function in AH or invalid parameter
int13_fail_noah:
SET_DISK_RET_STATUS(GET_AH());
int13_fail_nostatus:
SET_CF(); // error occurred
return;
int13_success:
SET_AH(0x00); // no error
int13_success_noah:
SET_DISK_RET_STATUS(0x00);
CLEAR_CF(); // no error
return;
}
void BIOSCALL int13_harddisk(disk_regs_t r)
{
uint32_t lba;
uint16_t cylinder, head, sector;
uint16_t nlc, nlh, nlspt;
uint16_t count;
uint8_t device, status;
bio_dsk_t __far *bios_dsk;
BX_DEBUG_INT13_HD("%s: AX=%04x BX=%04x CX=%04x DX=%04x ES=%04x\n", __func__, AX, BX, CX, DX, ES);
bios_dsk = read_word(0x0040,0x000E) :> &EbdaData->bdisk;
write_byte(0x0040, 0x008e, 0); // clear completion flag
// basic check : device has to be defined
if ( (GET_ELDL() < 0x80) || (GET_ELDL() >= 0x80 + BX_MAX_STORAGE_DEVICES) ) {
BX_DEBUG("%s: function %02x, ELDL out of range %02x\n", __func__, GET_AH(), GET_ELDL());
goto int13_fail;
}
// Get the ata channel
device = bios_dsk->hdidmap[GET_ELDL()-0x80];
// basic check : device has to be valid
if (device >= BX_MAX_STORAGE_DEVICES) {
BX_DEBUG("%s: function %02x, unmapped device for ELDL=%02x\n", __func__, GET_AH(), GET_ELDL());
goto int13_fail;
}
switch (GET_AH()) {
case 0x00: /* disk controller reset */
#ifdef VBOX_WITH_SCSI
/* SCSI controller does not need a reset. */
if (!VBOX_IS_SCSI_DEVICE(device))
#endif
ata_reset (device);
goto int13_success;
break;
case 0x01: /* read disk status */
status = read_byte(0x0040, 0x0074);
SET_AH(status);
SET_DISK_RET_STATUS(0);
/* set CF if error status read */
if (status) goto int13_fail_nostatus;
else goto int13_success_noah;
break;
case 0x02: // read disk sectors
case 0x03: // write disk sectors
case 0x04: // verify disk sectors
count = GET_AL();
cylinder = GET_CH();
cylinder |= ( ((uint16_t) GET_CL()) << 2) & 0x300;
sector = (GET_CL() & 0x3f);
head = GET_DH();
/* Segment and offset are in ES:BX. */
if ( (count > 128) || (count == 0) ) {
BX_INFO("%s: function %02x, count out of range!\n", __func__, GET_AH());
goto int13_fail;
}
/* Get the logical CHS geometry. */
nlc = bios_dsk->devices[device].lchs.cylinders;
nlh = bios_dsk->devices[device].lchs.heads;
nlspt = bios_dsk->devices[device].lchs.spt;
/* Sanity check the geometry. */
if( (cylinder >= nlc) || (head >= nlh) || (sector > nlspt )) {
BX_INFO("%s: function %02x, disk %02x, parameters out of range %04x/%04x/%04x!\n", __func__, GET_AH(), GET_DL(), cylinder, head, sector);
goto int13_fail;
}
// FIXME verify
if ( GET_AH() == 0x04 )
goto int13_success;
/* If required, translate LCHS to LBA and execute command. */
//@todo: The IS_SCSI_DEVICE check should be redundant...
if (( (bios_dsk->devices[device].pchs.heads != nlh) || (bios_dsk->devices[device].pchs.spt != nlspt)) || VBOX_IS_SCSI_DEVICE(device)) {
lba = ((((uint32_t)cylinder * (uint32_t)nlh) + (uint32_t)head) * (uint32_t)nlspt) + (uint32_t)sector - 1;
sector = 0; // this forces the command to be lba
}
/* Clear the count of transferred sectors/bytes. */
bios_dsk->drqp.trsfsectors = 0;
bios_dsk->drqp.trsfbytes = 0;
/* Pass request information to low level disk code. */
bios_dsk->drqp.lba = lba;
bios_dsk->drqp.buffer = MK_FP(ES, BX);
bios_dsk->drqp.nsect = count;
bios_dsk->drqp.sect_sz = 512; //@todo: device specific?
bios_dsk->drqp.cylinder = cylinder;
bios_dsk->drqp.head = head;
bios_dsk->drqp.sector = sector;
bios_dsk->drqp.dev_id = device;
status = dskacc[bios_dsk->devices[device].type].a[GET_AH() - 0x02](bios_dsk);
// Set nb of sector transferred
SET_AL(bios_dsk->drqp.trsfsectors);
if (status != 0) {
BX_INFO("%s: function %02x, error %02x !\n", __func__, GET_AH(), status);
SET_AH(0x0c);
goto int13_fail_noah;
}
goto int13_success;
break;
case 0x05: /* format disk track */
BX_INFO("format disk track called\n");
goto int13_success;
return;
break;
case 0x08: /* read disk drive parameters */
/* Get the logical geometry from internal table. */
nlc = bios_dsk->devices[device].lchs.cylinders;
nlh = bios_dsk->devices[device].lchs.heads;
nlspt = bios_dsk->devices[device].lchs.spt;
count = bios_dsk->hdcount;
/* Maximum cylinder number is just one less than the number of cylinders. */
nlc = nlc - 1; /* 0 based , last sector not used */
SET_AL(0);
SET_CH(nlc & 0xff);
SET_CL(((nlc >> 2) & 0xc0) | (nlspt & 0x3f));
SET_DH(nlh - 1);
SET_DL(count); /* FIXME returns 0, 1, or n hard drives */
// FIXME should set ES & DI
// @todo: Actually, the above comment is nonsense.
goto int13_success;
break;
case 0x10: /* check drive ready */
// should look at 40:8E also???
// Read the status from controller
status = inb(bios_dsk->channels[device/2].iobase1 + ATA_CB_STAT);
if ( (status & ( ATA_CB_STAT_BSY | ATA_CB_STAT_RDY )) == ATA_CB_STAT_RDY ) {
goto int13_success;
} else {
SET_AH(0xAA);
goto int13_fail_noah;
}
break;
case 0x15: /* read disk drive size */
/* Get the physical geometry from internal table. */
cylinder = bios_dsk->devices[device].pchs.cylinders;
head = bios_dsk->devices[device].pchs.heads;
sector = bios_dsk->devices[device].pchs.spt;
/* Calculate sector count seen by old style INT 13h. */
lba = (uint32_t)cylinder * head * sector;
CX = lba >> 16;
DX = lba & 0xffff;
SET_AH(3); // hard disk accessible
goto int13_success_noah;
break;
case 0x09: /* initialize drive parameters */
case 0x0c: /* seek to specified cylinder */
case 0x0d: /* alternate disk reset */
case 0x11: /* recalibrate */
case 0x14: /* controller internal diagnostic */
BX_INFO("%s: function %02xh unimplemented, returns success\n", __func__, GET_AH());
goto int13_success;
break;
case 0x0a: /* read disk sectors with ECC */
case 0x0b: /* write disk sectors with ECC */
case 0x18: // set media type for format
default:
BX_INFO("%s: function %02xh unsupported, returns fail\n", __func__, GET_AH());
goto int13_fail;
break;
}
int13_fail:
SET_AH(0x01); // defaults to invalid function in AH or invalid parameter
int13_fail_noah:
SET_DISK_RET_STATUS(GET_AH());
int13_fail_nostatus:
SET_CF(); // error occurred
return;
int13_success:
SET_AH(0x00); // no error
int13_success_noah:
SET_DISK_RET_STATUS(0x00);
CLEAR_CF(); // no error
return;
}