PDDREF:Generic IOCtl Commands: Difference between revisions

Latest revision as of 03:42, 22 May 2025

Physical Device Driver Reference
Introduction Physical Device Driver Overview Physical Device Driver Architecture and Structure OS/2 Physical Device Driver Operations OS/2 Physical Device Driver Design Issues Character Device Monitors Installation of External Loadable Device Drivers Physical Device Driver Strategy Commands Device Helper (DevHlp) Services Resource Management Linking Resource Manager Services Generic IOCtl Commands Appendixes OS/2 Version Compatibility Considerations Running OS/2 Version 1.3 16-Bit PDDs on OS/2 Using Advanced Bios Notices Glossary

OS/2 device drivers are used to access the I/O hardware. The IOCtl functions provide a method for an application, or subsystem, to send device-specific control commands to a physical device driver. These IOCtls are subfunctions that are issued through the DosDevIOCtl API function request. The DosDevIOCtl function request can be used only by OS/2 applications; the INT 21h IOCtl request can be used only by DOS applications.

The category and function fields are as follows. Each code is contained in a byte:

Category	Code
0xxx xxxx	OS/2-defined
1xxx xxxx	User-defined
_xxx xxxx	Code.

Function	Code
Return error, if unsupported	0xxx xxxx
Ignore, if unsupported	1xxx xxxx
Intercepted by the OS/2 operating system	x0xx xxxx
Passed to driver	x1xx xxxx
Sends data and commands to device	xx0x xxxx
Queries data and information from device	xx1x xxxx
Subfunction	___x xxxx

Notice that the send/query data bit is intended only to standardize the function set; it plays no critical role. Some functions can contain both command and query elements. Such commands are defined as sends data.

Generic IOCtl Example

The DosDevIOCtl function sends the request to the physical device driver request packet. The physical device driver receives the request packet, and looks for the Command Code (Command 16 is the generic IOCtl command) to identify the request. Notice that each device driver can define the structure of the Data Packet and the Parameter Packet, but all device drivers use the same request header.

The 16-bit calling sequence for DosDevIOCtl is shown below:

EXTRN   DosDevIOCtl:Far

PUSH@   OTHER  Data        ; Data Packet address
PUSH@   OTHER  ParmList    ; Parameter Packet address
PUSH    WORD   Function    ; Function code
PUSH    WORD   Category    ; Category code
PUSH    WORD   DevHandle   ; User's device driver file handle

CALL    DosDevIOCtl

The 32-bit calling sequence for DosDevIOCtl is shown below:

PUSH@   DWORD  DataLengthInOut   ; Data Length Address
PUSH    DWORD  DataLengthMAX     ; Max size of Data Packet
PUSH@   OTHER  Data              ; Data Packet Address
PUSH@   DWORD  ParmLengthInOut   ; Parm Length Address
PUSH    DWORD  ParmLengthMax     ; Max size of Parm List
PUSH@   OTHER  ParmList          ; Parameter Packet Address
PUSH    DWORD  Function          ; Function Code
PUSH    DWORD  Category          ; Category Code
PUSH    DWORD  DevHandle         ; User's device driver file handle

Call DOSDevIOCtl

DosDevIOCtl2 performs the same function as DosDevIOCtl, and also provides Length fields for the Data and Parameter List buffers. These Length fields should be passed to the Device Helper service VerifyAccess when the physical device driver is determining whether it has access to the application's Data and Parameter List buffers. The Length fields also tell physical network device drivers the amount of data residing in these buffers for the transfer to other network nodes.

The 16-bit calling sequence for DosDevIOCtl2 is shown below:

EXTRN   DosDevIOCtl2:Far

PUSH@   OTHER  Data        ; Data Packet address
PUSH    WORD   DataLength  ; Data Packet length
PUSH@   OTHER  ParmList    ; Parameter Packet address
PUSH    WORD   ParmLength  ; Parameter Packet length
PUSH    WORD   Function    ; Function code
PUSH    WORD   Category    ; Category code
PUSH    WORD   DevHandle   ; User's device driver file handle

CALL    DosDevIOCtl2

Generic IOCtl Function Table

The list of categories and functions for the generic IOCtl requests are as follows:

Category	Function	Description
01h		Serial Device Control
	14h	Reserved
	34h	Reserved
	41h	Set Bit Rate
	42h	Set Line Characteristics (stop, parity, data bits)
	43h	Extended Set Bit Rate
	44h	Transmit Byte Immediate
	45h	Set Break OFF
	46h	Set Modem Control Signals
	47h	Behave As If XOFF Received (stop transmit)
	48h	Behave As If XON Received (start transmit)
	49h	Reserved
	4Bh	Set Break ON
	53h	Set Device Control Block (DCB) Parameters
	54h	Set Enhanced Mode Parameters
	61h	Query Current Bit Rate
	62h	Query Line Characteristics
	63h	Extended Query Bit Rate
	64h	Query COM Status
	65h	Query Transmit Data Status
	66h	Query Modem Control Output Signals
	67h	Query Current Modem Input Signals
	68h	Query Number of Characters in Receive Queue
	69h	Query Number of Characters in Transmit Queue
	6Dh	Query COM Error
	72h	Query COM Event Information
	73h	Query Device Control Block (DCB) Parameters
	74h	Query Enhanced Mode Parameters
02h		Reserved
03h		Video Control
	70h	Allocate an LDT Selector
	71h	Deallocate an LDT Selector
	72h	Query Pointer Draw Address
	73h	Initialize Call Vector Table
	74h	ABIOS Pass-Through
	75h	Allocate an LDT Selector with Offset
	76h	Allocate an LDT Selector with Background Validation Options
	7Eh	Allocate Video Buffer
	7Fh	Get Address to ROM Font
04h		Keyboard Control
	50h	Set Code Page
	51h	Set Input Mode (Default ASCII)
	52h	Set Interim Character Flags
	53h	Set Shift State
	54h	Set Typematic Rate and Delay
	55h	Reserved
	56h	Set Session Manager Hot Key
	57h	Set KCB
	58h	Set Code Page Number
	59h	Set Read/Peek Notification
	5Ah	Alter Keyboard LEDs
	5Bh	Reserved
	5Ch	Set NLS and Custom Code Page
	5Dh	Create New Logical Keyboard
	5Eh	Destroy Logical Keyboard
	71h	Query Input Mode
	72h	Query Interim Character Flags
	73h	Query Shift State
	74h	Read Character Data Records
	75h	Peek Character Data Record
	76h	Query Session Manager Hot Key
	77h	Query Keyboard Type
	78h	Query Code Page Number
	79h	Translate Scan Code to ASCII
	7Ah	Query Keyboard Hardware ID
	7Bh	Query Keyboard Code Page Support Information
05h		Parallel Port Control
	42h	Set Frame Control (CPL, LPI)
	43h	Reserved
	44h	Set Infinite Retry
	45h	Reserved
	46h	Initialize Parallel Port
	47h	Reserved
	48h	Activate Font
	49h	Reserved
	4Bh	Reserved
	4Ch	Reserved
	4Dh	Set Print-Job Title
	4Eh	Set Parallel Port Write Time-Out Value
	4Fh	Reserved
	50h	Reserved
	51h	Reserved
	52h	Set Parallel Port Communication Mode
	53h	Set Parallel Port Data Transfer Mode
	62h	Query Frame Control
	63h	Reserved
	64h	Query Infinite Retry
	65h	Reserved
	66h	Query Parallel Port Status
	67h	Reserved
	68h	Reserved
	69h	Query Active Font
	6Ah	Verify Font
	6Bh	Reserved
	6Ch	Reserved
	6Dh	Reserved
	6Eh	Query Parallel Port Write Time-Out Value
	6Fh	Reserved
	70h	Reserved
	71h	Reserved
	72h	Query Parallel Port Communication Mode
	73h	Query Parallel Port Data Transfer Mode
	74h	Query Parallel Port Device ID
06h		Light Pen Control
07h		Mouse Control
	50h	Reserved
	51h	Notification of Display Mode Change
	52h	Reserved
	53h	Reassign Current Mouse Scaling Factors
	54h	Assign New Mouse Event Mask
	55h	Reassign Mouse Threshold Values
	56h	Set Pointer Shape
	57h	Unmark Collision Area
	58h	Mark Collision Area
	59h	Specify/Replace Pointer Screen Position
	5Ah	Set OS/2-Mode Pointer Draw Device Driver Address
	5Bh	Reserved
	5Ch	Set Current Physical Mouse Device Driver Status Flags
	5Dh	Notification of Mode Switch Completion
	60h	Query Number of Mouse Buttons Supported
	61h	Query Mouse Device Motion Sensitivity
	62h	Query Current Physical Mouse Device Driver Status Flags
	63h	Read Mouse Event Queue
	64h	Query Current Event Queue Status
	65h	Query Current Mouse Event Mask
	66h	Query Current Mouse Scaling Factors
	67h	Query Current Pointer Screen Position
	68h	Query Current Pointer Shape
	69h	Query Mouse Threshold Values
	6Ah	Query Physical Mouse Device Driver Level/Version
	6Bh	Query Pointing Device ID
08h		Logical Disk Control
	00h	Lock Drive
	01h	Unlock Drive
	02h	Redetermine Media (end format)
	03h	Set Logical Map
	04h	Begin Format
	20h	Block Removable
	21h	Query Logical Map
	22h	Reserved
	40h	Removable Media Control
	43h	Set Device Parameters
	44h	Write/Read/Verify Track
	45h	Format and Verify Track
	5Dh	Diskette Control
	5Eh	Reserved
	5Fh	Reserved
	60h	Query Media Sense
	63h	Query Device Parameters
	66h	Status
09h		Physical Disk Control
	00h	Lock Physical Drive
	01h	Unlock Physical Drive
	44h	Physical Write Track
	63h	Query Physical Device Parameters
	64h	Physical Read Track
	65h	Physical Verify Track
0Ah		Character Device Monitor Control
0Ah	40h	Register Monitor
0Bh		General Device Control
	01h	Flush Input Buffer
	02h	Flush Output Buffer
	41h	System Notifications for Physical Device Drivers
	60h	Query Monitor Support
0Ch		Advanced Power Management
	40h	Send Power Event
	41h	Set Power Event Res
	42h	Reserved
	60h	Query Power Status
	61h	Query Power Event
	62h	Query PowerInfo
0Dh-7Fh		Reserved Category Codes
80h		Screen Control
	00h	Get Current Video Memory Bank
	01h	Set Current Video Memory Bank
	02-07Fh	Reserved
	08h	Return Adapter Video Configuration
	09h	Return Manufacturer-Specific Adapter Data
	0Ah	Update Adapter Video Information
	0Bh	Return Linear Address Mapped to Physical Address
	0Ch-07Fh	Reserved
80h		OEMHLP Controls
	00h	Query OEM Adaptation Information
	01h	Query Machine Information
	02h	Query Display Combination Code
	03h	Return Video Fonts
	04h	Read EISA Configuration Information-Subfunction 00
	04h	Read EISA Function Information-Subfunction 01
	05h	Query ROM BIOS Information
	06h	Query Miscellaneous Video Information
	07h	Query Video Adapter
	08h	Query SVGA Information
	09h	Query Memory Information
	0Ah	Query, Display Mode, Query, and Set (DMQS) Information
	0Bh	Access PCI BIOS
	0Bh	Query PCI BIOS - Subfunction 00h
	0Bh	Find PCI Device - Subfunction 01h
	0Bh	Find PCI Class Code - Subfunction 02h
	0Bh	Read PCI Configuration Space - Subfunction 03h
	0Bh	Write PCI Configuration Space - Subfunction 04h
80h		TESTCFG.SYS
	40h	Obtain a Copy of BIOS/Adapter Memory
	41h	Issue an "IN" I/O Instruction
	42h	Issue an "OUT" I/O Instruction
	60h	Query Bus Architecture Function
	61h	Return All POS IDs
	62h	Return All EISA IDs
80h		Resource Manager
	01h	Get Resource Manager Node Information
	02h	Enumerate Resource Manager Nodes
80h		CD-ROM Drive and Disc Control
	40h	Reset Drive
	44h	Eject Disk
	45h	Close Tray
	46h	Lock/Unlock Door
	50h	Seek
	60h	Device Status
	61h	Identify CD-ROM Driver
	63h	Return Sector Size
	70h	Location of Drive Head
	72h	Read Long
	78h	Return Volume Size
	79h	Get UPC
81h		CD-ROM Audio Control
	40h	Audio Channel Control
	50h	Play Audio
	51h	Stop Audio
	52h	Resume Audio
	60h	Return Audio-Channel Information
	61h	Return Audio-Disc Information
	62h	Return Audio-Track Information
	63h	Return Audio-Subchannel Q Information
	65h	Return Audio-Status Information
81h		Touch-Device-Dependent Driver Control
	50h	Reserved
	51h	Reserved
	52h	Set Calibration Constants
	53h	Read Data
	54h	Set Data Mode
	55h	Set Click-Lock Parameters
	56h	Set Touch Thresholds
	57h	Set Emulation XY Offset
	58h	Set Data Report Rate
	59h	Set Low-Pass Filter
	5Ah	Write Memory Location
	5Bh	Reserved
	5Ch	Reserved
	5Dh	Reserved
	5Eh	Reserved
	5Fh	Reserved
	60h	Get Calibration Constants
	61h	Get Data Mode
	62h	Get Click Lock Parameters
	63h	Get Touch Thresholds
	64h	Get Emulation XY Offset
	65h	Get Data Report Rate
	66h	Get Low Pass Filter
	67h	Read Memory Location
81h		Touch-Device-Independent Driver Control
	50h	Set Coordinate System
	51h	Reserved
	52h	Set Selection Mechanism
	53h	Set Event Mask
	54h	Set Queue Size
	55h	Set Emulation State
	60h	Set Coordinate System
	61h	Reserved
	62h	Get Selection Mechanism
	63h	Get Event Mask
	64h	Get Queue Size
	65h	Get Emulation State
	66h	Get Read Event Queue

Category 01h ASYNC (RS232-C) Control IOCtl Commands

Whenever an IOCtl command calls for a NULL pointer, it is the responsibility of the application to set one up for the appropriate Parameter or Data Packet pointer before calling the physical device driver. IOCtls can be interpreted differently by future releases if the pointer is not a NULL pointer. If a NULL pointer is called for and it is not received by the device driver, it is considered an invalid Parameter or Data Packet value.

The physical device driver services each communications port (COM1, COM2, and so forth) independently. IOCtls issued to the physical device driver for a given port have no effect on any other communications ports that the physical device driver is servicing. The application cannot assume a given timing relationship between when the IOCtls are executed and when data is received or transmitted by the ASYNC hardware. Data Carrier Detect (DCD) is the same signal as Receiver Line Signal Detect (RLSD).

The following is a summary of the Category 01h IOCtl Commands:

Function	Description
14h	Reserved
34h	Reserved
41h	Set Bit Rate
42h	Set Line Characteristics (stop, parity, data bits)
43h	Extended Set Bit Rate
44h	Transmit Byte Immediate
45h	Set Break OFF
46h	Set Modem Control Signals
47h	Behave as if XOFF Received (stop transmit)
48h	Behave as if XON Received (start transmit)
49h	Reserved
4Bh	Set Break ON
53h	Set Device Control Block (DCB) Parameters
54h	Set Enhanced Mode Parameters
61h	Query Current Bit Rate
62h	Query Line Characteristics
63h	Extended Query Bit Rate
64h	Query COM Status
65h	Query Transmit Data Status
66h	Query Modem Control Output Signals
67h	Query Current Modem Input Signals
68h	Query Number of Characters in Receive Queue
69h	Query Number of Characters in Transmit Queue
6Dh	Query COM Error
72h	Query COM Event Information
73h	Query Device Control Block (DCB) Parameters
74h	Query Enhanced Mode Parameters

Category 03h Video Control IOCtl Commands

The following is a summary of the Category 03h Video Control IOCtl Commands:

Function	Description
70h	Allocate an LDT Selector
71h	Deallocate an LDT Selector
72h	Query Pointer Draw Address
73h	Initialize Call Vector Table
74h	ABIOS Pass-Through
75h	Allocate an LDT Selector with Offset
76h	Allocate an LDT Selector with Background Validation Options
7Eh	Allocate Video Buffer
7Fh	Get Address to ROM Font

Category 04h Keyboard Control IOCtl Commands

The following is a summary of the Category 04h IOCtl Commands:

Function	Description
50h	Set Code Page
51h	Set Input Mode (Default ASCII)
52h	Set Interim Character Flags
53h	Set Shift State
54h	Set Typematic Rate and Delay
55h	Reserved
56h	Set Session Manager Hot Key
57h	Set KCB
58h	Set Code Page Number
59h	Set Read/Peek Notification
5Ah	Alter Keyboard LEDs
5Bh	Reserved
5Ch	Set NLS and Custom Code Page
5Dh	Create a New Logical Keyboard
5Eh	Destroy a Logical Keyboard
71h	Query Input Mode
72h	Query Interim Character Flags
73h	Query Shift State
74h	Read Character Data Records
75h	Peek Character Data Record
76h	Query Session Manager Hot Key
77h	Query Keyboard Type
78h	Query Code Page Number
79h	Translate Scan Code to ASCII
7Ah	Query Keyboard Hardware ID
7Bh	Query Keyboard Code Page Support Information

Category 05h Parallel Port Control IOCtl Commands

The following is a summary of Category 05h IOCtl Commands:

Function	Description
42h	Set Frame Control (CPL, LPI)
43h	Reserved
44h	Set Infinite Retry
45h	Reserved
46h	Initialize Parallel Port
47h	Reserved
48h	Activate Font
49h	Reserved
4Bh	Reserved
4Ch	Reserved
4Dh	Set Print-Job Title
4Eh	Set Parallel Port Write Timeout Value
4Fh	Reserved
50h	Reserved
51h	Reserved
52h	Set Parallel Port Communication Mode
53h	Set Parallel Port Data Transfer Mode
62h	Query Frame Control
63h	Reserved
64h	Query Infinite Retry
65h	Reserved
66h	Query Parallel Port Status
67h	Reserved
68h	Reserved
69h	Query Active Font
6Ah	Verify Font
6Bh	Reserved
6Ch	Reserved
6Dh	Reserved
6Eh	Query Parallel Port Write Timeout Value
6Fh	Reserved
70h	Reserved
71h	Reserved
72h	Query Parallel Port Communication Mode
73h	Query Parallel Port Data Transfer Mode
74h	Query Parallel Port Device ID

Category 07h Mouse Control IOCtl Commands

The following is a summary of Category 07h IOCtl Commands:

07h Mouse Control IOCtl Commands
Function	Description
50h	Reserved
51h	Notification of Display Mode Change
52h	Reserved
53h	Reassign Current Mouse Scaling Factors
54h	Assign New Mouse Event Mask
55h	Reassign Mouse Threshold Values
56h	Set Pointer Shape
57h	Unmark Collision Area
58h	Mark Collision Area
59h	Specify/Replace Pointer Screen Position
5Ah	Set OS/2 Mode Pointer Draw Device Driver Address
5Bh	Reserved
5Ch	Set Current Physical Mouse Device Driver Status Flags
5Dh	Notification of Mode Switch Completion
60h	Query Number of Mouse Buttons Supported
61h	Query Mouse Device Motion Sensitivity
62h	Query Current Physical Mouse Device Driver Status Flags
63h	Read Mouse Event Queue
64h	Query Current Event Queue Status
65h	Query Current Mouse Event Mask
66h	Query Current Mouse Scaling Factors
67h	Query Current Pointer Screen Position
68h	Query Current Pointer Shape
69h	Query Mouse Threshold Values
6Ah	Query Physical Mouse Device Driver Level/Version Number
6Bh	Query Pointing Device ID

Category 08h Logical Disk Control IOCtl Commands

The following is a summary of Category 08h IOCtl Commands:

Function	Description
00h	Lock Drive
01h	Unlock Drive
02h	Redetermine Media
03h	Set Logical Map
04h	Begin Format
20h	Block Removable
21h	Query Logical Map
22h	Reserved
40h	Removable Media Control
43h	Set Device Parameters
44h	Write Logical Track
45h	Format and Verify Track
5Dh	Diskette Control
5Eh	Reserved
5Fh	Reserved
60h	Query Media Sense
63h	Query Device Parameters
64h	Read Logical Track
65h	Verify Logical Track
66h	Status

Category 09h Physical Disk Control IOCtl Commands

Category 09h is used to access physical partitionable hard disks. The handle used for Category 09h command is returned by the DosPhysicalDisk (Function 2) API function. (See the OS/2 Control Program Programming Reference for more information). This handle is used to tell the system which physical disk is accessed by the IOCtl command.

The Physical Disk Control commands relate to the entire partitionable hard disk. Direct track and sector I/O start at the beginning of the physical drive. PDSK_GETPHYSDEVICEPARAMS, describes the entire physical device.

The following is a summary of Category 09h IOCtl Commands:

Function	Description
00h	Lock Physical Drive
01h	Unlock Physical Drive
44h	Write Physical Track
63h	Query Physical Device Parameters
64h	Read Physical Track
65h	Verify Physical Track

Category 0Ah Character Device Monitor IOCtl Command

The following is the Category 0Ah IOCtl Command:

Function  Description
   40h    Register Monitor

Category 0Bh General Device Control IOCtl Commands

The following is a summary of Category 0Bh IOCtl Commands:

Function	Description
01h	Flush Input Buffer
02h	Flush Output Buffer
41h	System Notifications for Physical Device Drivers
60h	Query Monitor Support

Category 0Ch Advanced Power Management

Function	Description
40h	Send Power Event
41h	Set Power Event Resource
42h - 44h	Reserved
45h	OEM APM Function
60h	Query Power Status
61h	Query Power Event
62h	Query Power Information
63h	Query Power State

Category 80h Screen Control IOCtl Commands

The following video IOCtls are defined and supported by the SCREENDD$ device driver, by way of the DosDevIOCtl call. The IOCtl category code is 80h (defined as SCREENDD_CATEGORY).

The function codes within the SCREENDD_CATEGORY are:

Function	Description
00h	Get Current Video Memory Bank
01h	Set Current Video Memory Bank
02h-07h	Reserved
08h	Return Adapter Video Configuration
09h	Return Manufacturer-Specific Adapter Data
0Ah	Update Adapter Video Memory Information
0Bh	Return Linear Address Mapped to Physical Address
0Ch-7Fh	Reserved

An example of the DosDevIOCtl calling convention for the Screen IOCtls follows:

int PASCAL near videoIoctl(VOID *data,VOID *parm,USHORT function)
{
  unsigned hScreenDD;                  /* handle of SCREENDD$ dev driver */
  unsigned OpenAction;                 /* action taken to open device    */
  unsigned rc;                         /* function return code           */

  if (!(rc = DosOpen(SCREENDD_NAME, (PHFILE)&hScreenDD, (PUSHORT)&OpenAction,
     NO_SIZE, NO_ATTRIBUTES, OPEN_IF_EXISTS, NO_INHERIT+DENY_NONE+READ_WRITE,
     RESERVED_LONG)))
  {
    rc = DosDevIOCtl(data,
                     parm,
                     function,
                     SCREENDD_CATEGORY,
                     (HFILE)hScreenDD);
    DosClose(hScreenDD);
  }
  return (rc);

Category 80h OEMHLP IOCtls

The OEMHLP interface was originally designed to allow Original Equipment Manufacturers (OEMs) to modify and adapt the OS/2 operating system to run on their hardware. In the past, IBM supported the OS/2 operating system on IBM hardware only. Therefore, OEMs had to build modified versions of the OS/2 operating system. The OEMHLP interface facilitated this process.

IBM currently tests the OS/2 operating system on a wide variety of OEM hardware. It is no longer necessary for OEMs to adapt the OS/2 operating system to their machines. Now the OEMHLP interface can be used to obtain real-mode information. This information can be passed to applications and device drivers running in protect mode. Applications and physical device drivers running in protect mode cannot access BIOS through the INT interface. The OEMHLP interface allows access to BIOS information and functions that are essential to these programs.

For example, you might want to issue INT 15h calls from your device driver initialization code to determine if an Extended Industry Standard Architecture (EISA) adapter is present. The following examples show the methods to determine if a specific EISA or Micro Channel adapter is present.

Using the Query Adapter ID to Verify EISA Adapter

The following example uses the OEMHLP IOCtl interface to verify the EISA card ID:

USHORT FindMyEISACard(void)
{
  HFILE filehandle;
  USHORT action;

  EISAFunctionInfo.efi_SubFunc = OEM_GET_SLOT_INFO; /* EISA Get Slot Info */
  EISAFunctionInfo.efi_Slot    = 0;                 /* Slot 0             */

  rc = DosOpen("OEMHLP$",
               &filehandle,
               &action,
               0L,
               0,
               1,
               0x40,
               0L);
  if (rc == 0)
    {
    for(index=1;index<CFG_MAX_EISA_SLOTS;index++)   /* For each slot      */
      {
      EISAFunctionInfo.efi_Slot    = (UCHAR) index; /* Slot Number        */
      EISASlotInfo.esi_CardID  = 0;                 /* Reset Card ID value*/
      rc = DosDevIOCtl((PVOID)&EISASlotInfo,        /* Data Packet */
                       (PVOID)&EISAFunctionInfo,    /* Parm Packet */
                       (USHORT)OEMHLP_QUERYEISACONFIG,
                       (USHORT)OEMHLP_CATEGORY,
                       (HFILE)filehandle);
      /* If IOCtl successful and slot has adapter, then store away
         the adapter ID, otherwise mark as empty with a zero.
       */
      if((rc==0)&&(EISASlotInfo.esi_Error==0))
        {
        if (EISASlotInfo.esi_CardID == MYCARDID)
           DosClose(filehandle);        /* Close handle to OEMHLP$ */
           return(FOUND);
        }
      }
      DosClose(filehandle);             /* Close handle to OEMHLP$ */
    }
   return(NOTFOUND);
}

Using the DevHlp_ABIOSCall to Verify Micro Channel Adapter

The following example uses the DevHlp_ABIOSCall to verify the Micro Channel POS ID:

USHORT FindMyMicroChannelCard(void)
{
  USHORT i,rc;             /* Index and return code    */
  USHORT LID;              /* Logical ID               */

  if (GetLIDEntry(POS,0,1,&LID))
     return(NOTFOUND);

  /* Get length of RB to use for reading POS data. */

  POSLenRB.rb.RBLen = sizeof(POSLENRB);
  POSLenRB.rb.Func  = 0x01;
  POSLenRB.rb.LID   = LID;
  POSLenRB.rb.Unit  = 0;
  POSLenRB.rb.Resv1 = 0;
  POSLenRB.rb.Resv2 = 0;
  POSLenRB.Rsv1     = 0;
  POSLenRB.Rsv2     = 0;
  POSLenRB.Rsv3     = 0;
  rc = ABIOSCall( LID, &POSLenRB, 0);

  /*Is my request block big enough? */

  if ((rc==0) && (sizeof(POSRB) >= POSLenRB.RBLen))
     {
       RB.rb.RBLen = POSLenRB.RBLen;       /* request block length        */
       RB.rb.Func  = 0x0b;                 /* read stored POS data to mem */
       RB.rb.LID   = LID;                  /* Logical ID                  */
       RB.rb.Unit  = 0;
       RB.DataBuf  = (ULONG)(FARPOINTER)&POSData;

       for(i=0;i<=CFG_MAX_POS_SLOTS;i++)   /* For each slot, get POS ID   */
          {
           RB.Slot = (UCHAR)i;
           rc = ABIOSCall(LID,&RB,0);
           if((rc==0)&&(RB.rb.RetCode==0))
             if (RB.AdapterID == MYCARD)
                {
                  FreeLIDEntry(LID);
                  return(FOUND);
                }
          }
     }

  FreeLIDEntry(LID);             /* Release LID Entry */
  return(NOTFOUND);
}

OEMHLP IOCtls Summary

The following is a summary of Category 80h OEMHLP IOCtl Commands:

Function	Description
00h	Query OEM Adaptation Information
01h	Query Machine Information
02h	Query Display Combination Code
03h	Return Video Fonts
04h	Read EISA Slot Configuration Information - Subfunction 00
04h	Read EISA Function Configuration Information - Subfunction 01
05h	Query ROM BIOS Information
06h	Query Miscellaneous Video Information
07h	Query Video Adapter
08h	Query SVGA Information
09h	Query Memory Information
0Ah	Query Display Mode, Query and Set (DMQS) Information
0Bh	Access PCI BIOS Information
0Bh	Query PCI BIOS Information - Subfunction 00h
0Bh	Find PCI Device - Subfunction 01h
0Bh	Find PCI Class Code - Subfunction 02h
0Bh	Read PCI Configuration Space - Subfunction 03h
0Bh	Write PCI Configuration Space - Subfunction 04h

Category 80h Adapter Presence-Check Services (TESTCFG.SYS)

The TESTCFG device driver provides services for automatic detection of Original Equipment Manufacturer (OEM) hardware interfaces. Functions provided by this driver are accessed entirely by opening the device name TESTCFG$ and using the following Category 80h IOCtls.

Function	Description
40H	Get Copy of BIOS/Adapter Memory
41H	Issue an "IN" I/O Instruction
42H	Issue an "OUT" I/O Instruction
60H	Get Bus Architecture Function
61H	Return All POS IDs
62H	Return All EISA IDs

Category 80h Resource Manager IOCtl Commands

RESOURCE.SYS provides two IOCtls that allow a ring 3 application to obtain a "snapshot" of the Resource Management data structures. Obtaining a snapshot of the Resource Management data structures consists of the following two steps:

1.- A data structure representing a depth-first traversal of the Resource Manager node structure is obtained.

2.- For each node traversed, the following information is provided:

A Resource Manager handle to access the node.
The depth of the node in the tree structure.

3.- A copy of each Resource Manager node can be obtained by supplying the node handle returned in Step 1.

Function	Description
01h	Get Resource Manager Node Data
02h	Enumerate Resource Manager Nodes

Category 80h CD-ROM Drive and Disc IOCtl Commands

The OS/2 CD-ROM Device Manager provides an interface through generic IOCtls.

The CD-ROM device driver returns error values in the range of hex FF00 through FF14. DOS DevIOCtl return codes are described in the OS/2 Programming Reference manuals.

Function	Description
40h	Reset Drive
44h	Eject Disc
45h	Close Tray
46h	Lock/Unlock Door
50h	Seek
60h	Return Device Status
61h	Identify CD-ROM Driver
63h	Return Sector Size
70h	Report Location of Drive Head
72h	Read Long
78h	Return Volume Size
79h	Get UPC

Category 81h CD-ROM Audio IOCtl Commands

The OS/2 CD-ROM Device Manager provides an interface through generic IOCtls.

The CD-ROM device driver returns error values in the range of hex FF00 through FF14. DOSDevIOCtl return codes are described in the OS/2 Programming Reference manuals.

Function	Description
40h	Set Audio Channel Control
50h	Play Audio
51h	Stop Audio
52h	Resume Audio
60h	Return Audio-Channel Information
61h	Return Audio-Disk Information
62h	Return Audio-Track Information
63h	Return Audio-Subchannel Q Information
65h	Return Audio-Status Information

Category 81h Touch Device-Dependent Driver

All Touch device driver IOCtl commands share Category 81h commands, which are distinguished by the device name used in the device Open (PDITOU$ for the device-dependent driver, TOUCH$ for the device-independent driver).

Device-Dependent Device Driver Command Summary

The following table describes the Category 81h Touch Device-Dependent Driver IOCtl commands:

Function	Description
50h	Reserved.
51h	Reserved.
52h	Set Calibration Constants
53h	Read Data
54h	Set Data Mode
55h	Set Click-Lock Parameters
56h	Set Touch Thresholds
57h	Set Emulation XY Offset
58h	Set Data Report Rate
59h	Set Low Pass Filter
5Ah	Write Memory Location
5Bh	Reserved.
5Ch
5Dh
5Eh
5Fh
60h	Get Calibration Constants
61h	Get Data Mode
62h	Get Click-Lock Parameters
63h	Get Touch Thresholds
64h	Get Emulation XY Offset
65h	Get Data Report Rate
66h	Get Low Pass Filter
67h	Read Memory Location

Category 81h Touch Device-Independent Driver

All Touch device driver IOCtl commands share Category 81h commands, which are distinguished by the device name used in the device Open (PDITOU$ for the device-dependent driver, TOUCH$ for the device-independent driver).

The following lists and describes the Category 81h Touch Device-Independent Driver:

Function	Description
50h	Set Coordinate System
51h	Reserved
52h	Set Selection Mechanism
53h	Set Event Mask
54h	Set Queue Size
55h	Set Emulation State
60h	Get Coordinate System
61h	Reserved
62h	Get Selection Mechanism
63h	Get Event Mask
64h	Get Queue Size
65h	Get Emulation State
66h	Get Read Event Queue