/**
* Init the SCSI driver and detect attached disks.
*/
void BIOSCALL scsi_init(void)
{
uint8_t identifier;
bio_dsk_t __far *bios_dsk;
bios_dsk = read_word(0x0040, 0x000E) :> &EbdaData->bdisk;
bios_dsk->scsi_hdcount = 0;
identifier = 0;
/* Detect BusLogic adapter. */
outb(BUSLOGIC_BIOS_IO_PORT+VBSCSI_REGISTER_IDENTIFY, 0x55);
identifier = inb(BUSLOGIC_BIOS_IO_PORT+VBSCSI_REGISTER_IDENTIFY);
if (identifier == 0x55)
{
/* Detected - Enumerate attached devices. */
VBSCSI_DEBUG("scsi_init: BusLogic SCSI adapter detected\n");
outb(BUSLOGIC_BIOS_IO_PORT+VBSCSI_REGISTER_RESET, 0);
scsi_enumerate_attached_devices(BUSLOGIC_BIOS_IO_PORT);
}
else
{
VBSCSI_DEBUG("scsi_init: BusLogic SCSI adapter not detected\n");
}
/* Detect LsiLogic adapter. */
outb(LSILOGIC_BIOS_IO_PORT+VBSCSI_REGISTER_IDENTIFY, 0x55);
identifier = inb(LSILOGIC_BIOS_IO_PORT+VBSCSI_REGISTER_IDENTIFY);
if (identifier == 0x55)
{
/* Detected - Enumerate attached devices. */
VBSCSI_DEBUG("scsi_init: LSI Logic SCSI adapter detected\n");
outb(LSILOGIC_BIOS_IO_PORT+VBSCSI_REGISTER_RESET, 0);
scsi_enumerate_attached_devices(LSILOGIC_BIOS_IO_PORT);
}
else
{
VBSCSI_DEBUG("scsi_init: LSI Logic SCSI adapter not detected\n");
}
/* Detect LsiLogic SAS adapter. */
outb(LSILOGIC_SAS_BIOS_IO_PORT+VBSCSI_REGISTER_IDENTIFY, 0x55);
identifier = inb(LSILOGIC_SAS_BIOS_IO_PORT+VBSCSI_REGISTER_IDENTIFY);
if (identifier == 0x55)
{
/* Detected - Enumerate attached devices. */
VBSCSI_DEBUG("scsi_init: LSI Logic SAS adapter detected\n");
outb(LSILOGIC_SAS_BIOS_IO_PORT+VBSCSI_REGISTER_RESET, 0);
scsi_enumerate_attached_devices(LSILOGIC_SAS_BIOS_IO_PORT);
}
else
{
VBSCSI_DEBUG("scsi_init: LSI Logic SAS adapter not detected\n");
}
}
/**
* Enumerate attached devices.
*
* @returns nothing.
* @param io_base The I/O base port of the controller.
*/
void scsi_enumerate_attached_devices(uint16_t io_base)
{
int i;
uint8_t buffer[0x0200];
bio_dsk_t __far *bios_dsk;
bios_dsk = read_word(0x0040, 0x000E) :> &EbdaData->bdisk;
/* Go through target devices. */
for (i = 0; i < VBSCSI_MAX_DEVICES; i++)
{
uint8_t rc;
uint8_t aCDB[10];
aCDB[0] = SCSI_INQUIRY;
aCDB[1] = 0;
aCDB[2] = 0;
aCDB[3] = 0;
aCDB[4] = 5; /* Allocation length. */
aCDB[5] = 0;
rc = scsi_cmd_data_in(io_base, i, aCDB, 6, buffer, 5);
if (rc != 0)
BX_PANIC("scsi_enumerate_attached_devices: SCSI_INQUIRY failed\n");
/* Check if there is a disk attached. */
if ( ((buffer[0] & 0xe0) == 0)
&& ((buffer[0] & 0x1f) == 0x00))
{
VBSCSI_DEBUG("scsi_enumerate_attached_devices: Disk detected at %d\n", i);
/* We add the disk only if the maximum is not reached yet. */
if (bios_dsk->scsi_hdcount < BX_MAX_SCSI_DEVICES)
{
uint32_t sectors, sector_size, cylinders;
uint16_t heads, sectors_per_track;
uint8_t hdcount, hdcount_scsi, hd_index;
/* Issue a read capacity command now. */
_fmemset(aCDB, 0, sizeof(aCDB));
aCDB[0] = SCSI_READ_CAPACITY;
rc = scsi_cmd_data_in(io_base, i, aCDB, 10, buffer, 8);
if (rc != 0)
BX_PANIC("scsi_enumerate_attached_devices: SCSI_READ_CAPACITY failed\n");
/* Build sector number and size from the buffer. */
//@todo: byte swapping for dword sized items should be farmed out...
sectors = ((uint32_t)buffer[0] << 24)
| ((uint32_t)buffer[1] << 16)
| ((uint32_t)buffer[2] << 8)
| ((uint32_t)buffer[3]);
sector_size = ((uint32_t)buffer[4] << 24)
| ((uint32_t)buffer[5] << 16)
| ((uint32_t)buffer[6] << 8)
| ((uint32_t)buffer[7]);
/* We only support the disk if sector size is 512 bytes. */
if (sector_size != 512)
{
/* Leave a log entry. */
BX_INFO("Disk %d has an unsupported sector size of %u\n", i, sector_size);
continue;
}
/* We need to calculate the geometry for the disk. From
* the BusLogic driver in the Linux kernel.
*/
if (sectors >= (uint32_t)4 * 1024 * 1024)
{
heads = 255;
sectors_per_track = 63;
}
else if (sectors >= (uint32_t)2 * 1024 * 1024)
{
heads = 128;
sectors_per_track = 32;
}
else
{
heads = 64;
sectors_per_track = 32;
}
cylinders = (uint32_t)(sectors / (heads * sectors_per_track));
hdcount_scsi = bios_dsk->scsi_hdcount;
/* Calculate index into the generic disk table. */
hd_index = hdcount_scsi + BX_MAX_ATA_DEVICES;
bios_dsk->scsidev[hdcount_scsi].io_base = io_base;
bios_dsk->scsidev[hdcount_scsi].target_id = i;
bios_dsk->devices[hd_index].type = DSK_TYPE_SCSI;
bios_dsk->devices[hd_index].device = DSK_DEVICE_HD;
bios_dsk->devices[hd_index].removable = 0;
bios_dsk->devices[hd_index].lock = 0;
bios_dsk->devices[hd_index].blksize = sector_size;
bios_dsk->devices[hd_index].translation = GEO_TRANSLATION_LBA;
/* Write LCHS values. */
bios_dsk->devices[hd_index].lchs.heads = heads;
bios_dsk->devices[hd_index].lchs.spt = sectors_per_track;
if (cylinders > 1024)
bios_dsk->devices[hd_index].lchs.cylinders = 1024;
else
bios_dsk->devices[hd_index].lchs.cylinders = (uint16_t)cylinders;
/* Write PCHS values. */
bios_dsk->devices[hd_index].pchs.heads = heads;
bios_dsk->devices[hd_index].pchs.spt = sectors_per_track;
if (cylinders > 1024)
bios_dsk->devices[hd_index].pchs.cylinders = 1024;
else
bios_dsk->devices[hd_index].pchs.cylinders = (uint16_t)cylinders;
bios_dsk->devices[hd_index].sectors = sectors;
/* Store the id of the disk in the ata hdidmap. */
hdcount = bios_dsk->hdcount;
bios_dsk->hdidmap[hdcount] = hdcount_scsi + BX_MAX_ATA_DEVICES;
hdcount++;
bios_dsk->hdcount = hdcount;
/* Update hdcount in the BDA. */
hdcount = read_byte(0x40, 0x75);
hdcount++;
write_byte(0x40, 0x75, hdcount);
hdcount_scsi++;
bios_dsk->scsi_hdcount = hdcount_scsi;
}
else
{
/* We reached the maximum of SCSI disks we can boot from. We can quit detecting. */
break;
}
}
else
VBSCSI_DEBUG("scsi_enumerate_attached_devices: No disk detected at %d\n", i);
}
}
