CBlkDev *ATAMount(U8 first_drive_let, I64 type, I64 port_num)
{
    CBlkDev *res;

    if (0 <= first_drive_let - 'A' < DRIVES_NUM && (type == BDT_ATA || type == BDT_ATAPI) && 0 <= port_num <= AHCI_MAX_PORTS)
    {
        res = BlkDevNextFreeSlot(first_drive_let, type);
        res->port_num = port_num;
        res->ahci_port = &blkdev.ahci_hba->ports[port_num];
        res->ahci_port->cmd_list_base = NULL; // See AHCIAtaInit ...
        if (BlkDevAdd(res,, FALSE, FALSE))
            return res;
    }

    return NULL;
}

I64 MountAHCIAuto()
{//Try to mount hard drives and CD/DVD drives automatically. (Kernel.Config option).
//It uses 'C' and 'T' as first drive letters or whatever you set
//in config when compiling Kernel.ZXE.
    CBlkDev     *bd     = Letter2BlkDev(':', FALSE);
    I64          res    = 0, i, ata_port = -1, atapi_port = -1;
    CAHCIPort   *port;

    "MountAHCIAuto;\n";
    if (bd)
    {
        // if boot-drive blkdev exists, do a SATA port iteration to mount it first
        "( ':' BlkDev at 0x%0X )\n", bd;
        for (i = 0; i < AHCI_MAX_PORTS; i++)
            if (Bt(&blkdev.ahci_hba->ports_implemented, i))
            {
                port = &blkdev.ahci_hba->ports[i];

                if (bd->port_num == i)
                {
                    if (ata_port == -1 && bd->type == BDT_ATA && port->signature == AHCI_PxSIG_ATA)
                    {
                        "ATAMount('%C', BDT_ATA, %d);\n", blkdev.first_hd_drive_let, i;
                        ATAMount(blkdev.first_hd_drive_let, BDT_ATA, i);
                        ata_port = i;
                        res++;
                    }
                    else if (atapi_port == -1 && bd->type == BDT_ATAPI && port->signature == AHCI_PxSIG_ATAPI)
                    {
                        "ATAMount('%C', BDT_ATAPI, %d);\n", blkdev.first_dvd_drive_let, i;
                        ATAMount(blkdev.first_dvd_drive_let, BDT_ATAPI, i);
                        atapi_port = i;
                        res++;
                    }
                }
            }
    }
    // do a 2nd iteration to mount remaining drives
    // (we will end up trying to boot off whichever drive/partition ends up at chosen letter)
    for (i = 0; i < AHCI_MAX_PORTS; i++)
        if (i != ata_port && i != atapi_port && Bt(&blkdev.ahci_hba->ports_implemented, i))
        {
            port = &blkdev.ahci_hba->ports[i];

            if (port->signature == AHCI_PxSIG_ATA)
            {
                "ATAMount('%C', BDT_ATA, %d);\n", blkdev.first_hd_drive_let, i;
                if (ATAMount(blkdev.first_hd_drive_let, BDT_ATA, i))
                    res++;
            }
            else if (port->signature == AHCI_PxSIG_ATAPI)
            {
                "ATAMount('%C', BDT_ATAPI, %d);\n", blkdev.first_dvd_drive_let, i;
                if (ATAMount(blkdev.first_dvd_drive_let, BDT_ATAPI, i))
                    res++;
            }
        }
    "\n";
    blkdev.mount_ide_auto_count = res;

    return res;
}