BOOLEAN DiskGetExtendedDriveParameters	(	UCHAR	DriveNumber,
		PVOID	Buffer,
		USHORT	BufferSize
	)
Definition at line 146 of file i386disk.c.
Referenced by GetHarddiskConfigurationData(), and PcDiskGetDriveGeometry().
{
    REGS    RegsIn;
    REGS    RegsOut;
    PUSHORT Ptr = (PUSHORT)(BIOSCALLBUFFER);

    TRACE("DiskGetExtendedDriveParameters()\n");

    if (!DiskInt13ExtensionsSupported(DriveNumber))
            return FALSE;

    // Initialize transfer buffer
    *Ptr = BufferSize;

    // BIOS Int 13h, function 48h - Get drive parameters
    // AH = 48h
    // DL = drive (bit 7 set for hard disk)
    // DS:SI = result buffer
    // Return:
    // CF set on error
    // AH = status (07h)
    // CF clear if successful
    // AH = 00h
    // DS:SI -> result buffer
    RegsIn.b.ah = 0x48;
    RegsIn.b.dl = DriveNumber;
    RegsIn.x.ds = BIOSCALLBUFSEGMENT;   // DS:SI -> result buffer
    RegsIn.w.si = BIOSCALLBUFOFFSET;

    // Get drive parameters
    Int386(0x13, &RegsIn, &RegsOut);

    if (!INT386_SUCCESS(RegsOut))
    {
        return FALSE;
    }

    memcpy(Buffer, Ptr, BufferSize);

#if DBG
    TRACE("size of buffer:                          %x\n", Ptr[0]);
    TRACE("information flags:                       %x\n", Ptr[1]);
    TRACE("number of physical cylinders on drive:   %u\n", *(PULONG)&Ptr[2]);
    TRACE("number of physical heads on drive:       %u\n", *(PULONG)&Ptr[4]);
    TRACE("number of physical sectors per track:    %u\n", *(PULONG)&Ptr[6]);
    TRACE("total number of sectors on drive:        %I64u\n", *(unsigned long long*)&Ptr[8]);
    TRACE("bytes per sector:                        %u\n", Ptr[12]);
    if (Ptr[0] >= 0x1e)
    {
        TRACE("EED configuration parameters:            %x:%x\n", Ptr[13], Ptr[14]);
        if (Ptr[13] != 0xffff && Ptr[14] != 0xffff)
        {
           PUCHAR SpecPtr = (PUCHAR)(ULONG_PTR)((Ptr[13] << 4) + Ptr[14]);
           TRACE("SpecPtr:                                 %x\n", SpecPtr);
           TRACE("physical I/O port base address:          %x\n", *(PUSHORT)&SpecPtr[0]);
           TRACE("disk-drive control port address:         %x\n", *(PUSHORT)&SpecPtr[2]);
           TRACE("drive flags:                             %x\n", SpecPtr[4]);
           TRACE("proprietary information:                 %x\n", SpecPtr[5]);
           TRACE("IRQ for drive:                           %u\n", SpecPtr[6]);
           TRACE("sector count for multi-sector transfers: %u\n", SpecPtr[7]);
           TRACE("DMA control:                             %x\n", SpecPtr[8]);
           TRACE("programmed I/O control:                  %x\n", SpecPtr[9]);
           TRACE("drive options:                           %x\n", *(PUSHORT)&SpecPtr[10]);
        }
    }
    if (Ptr[0] >= 0x42)
    {
        TRACE("signature:                             %x\n", Ptr[15]);
    }
#endif

    return TRUE;
}
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