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PDDREF:Generic IOCtl Commands

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Physical Device Driver Reference
  1. Introduction
  2. Physical Device Driver Overview
  3. Physical Device Driver Architecture and Structure
  4. OS/2 Physical Device Driver Operations
  5. OS/2 Physical Device Driver Design Issues
  6. Character Device Monitors
  7. Installation of External Loadable Device Drivers
  8. Physical Device Driver Strategy Commands
  9. Device Helper (DevHlp) Services
  10. Resource Management
  11. Linking Resource Manager Services
  12. 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
0xxx xxxx       Return error, if unsupported
1xxx xxxx       Ignore, if unsupported
x0xx xxxx       Intercepted by the OS/2 operating system
x1xx xxxx       Passed to driver
xx0x xxxx       Sends data and commands to device
xx1x xxxx       Queries data and information from device
___x xxxx       Subfunction.

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
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: 

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
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
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