unit wnaspi32;

{$mode objfpc}

interface

uses Windows;

type
  LPSRB = Pointer;

const
{ $packrecords c}

  SENSE_LEN                 = 14;  // Default sense buffer length
  SRB_DIR_SCSI              = $00; // Direction determined by SCSI command
  SRB_DIR_IN                = $08; // Transfer from SCSI target to host
  SRB_DIR_OUT               = $10; // Transfer from host to SCSI target
  SRB_POSTING               = $01; // Enable ASPI posting
  SRB_EVENT_NOTIFY          = $40; // Enable ASPI event notification
  SRB_ENABLE_RESIDUAL_COUNT = $04; // Enable residual byte count reporting
  SRB_DATA_SG_LIST          = $02; // Data buffer points to scatter-gather list

  WM_ASPIPOST               = $4D42; // ASPI Post message
  
{ ---------------------------------------------------------------------
  ASPI Command Definitions  
  ---------------------------------------------------------------------}
    
  SC_HA_INQUIRY     = $00; // Host adapter inquiry
  SC_GET_DEV_TYPE   = $01; // Get device type
  SC_EXEC_SCSI_CMD  = $02; // Execute SCSI command
  SC_ABORT_SRB      = $03; // Abort an SRB
  SC_RESET_DEV      = $04; // SCSI bus device reset
  SC_GET_DISK_INFO  = $06; // Get Disk information

{ ---------------------------------------------------------------------
  SRB Status  
  ---------------------------------------------------------------------}

  SS_PENDING        = $00; // SRB being processed
  SS_COMP           = $01; // SRB completed without error
  SS_ABORTED        = $02; // SRB aborted
  SS_ABORT_FAIL     = $03; // Unable to abort SRB
  SS_ERR            = $04; // SRB completed with error

  SS_INVALID_CMD    = $80; // Invalid ASPI command
  SS_INVALID_HA     = $81; // Invalid host adapter number
  SS_NO_DEVICE      = $82; // SCSI device not installed

  SS_INVALID_SRB    = $E0; // Invalid parameter set in SRB
  SS_FAILED_INIT    = $E4; // ASPI for windows failed init
  SS_ASPI_IS_BUSY   = $E5; // No resources available to execute cmd
  SS_BUFFER_TO_BIG  = $E6; // Buffer size to big to handle!
  SS_NO_ADAPTERS    = $E8; // No adapters.

{ ---------------------------------------------------------------------
    Host Adapter Status
  ---------------------------------------------------------------------}
  
  HASTAT_OK                   = $00; // Host adapter did not detect an 															// error
  HASTAT_SEL_TO               = $11; // Selection Timeout
  HASTAT_DO_DU                = $12; // Data overrun data underrun
  HASTAT_BUS_FREE             = $13; // Unexpected bus free
  HASTAT_PHASE_ERR            = $14; // Target bus phase sequence 																// failure
  HASTAT_TIMEOUT              = $09; // Timed out while SRB was 																	waiting to beprocessed.
  HASTAT_COMMAND_TIMEOUT      = $0B; // While processing the SRB, the adapter timed out.
  HASTAT_MESSAGE_REJECT       = $0D; // While processing SRB, the 																// adapter received a MESSAGE 															// REJECT.
  HASTAT_BUS_RESET            = $0E; // A bus reset was detected.
  HASTAT_PARITY_ERROR         = $0F; // A parity error was detected.
  HASTAT_REQUEST_SENSE_FAILED = $10; // The adapter failed in issuing

{ ---------------------------------------------------------------------
    SRB - HOST ADAPTER INQUIRY - SC_HA_INQUIRY
  ---------------------------------------------------------------------}
  
type

  SRB_HAInquiry = record
    SRB_Cmd : Byte;                       // ASPI command code = SC_HA_INQUIRY
    SRB_Status : Byte;                    // ASPI command status byte
    SRB_HaId : Byte;                      // ASPI host adapter number
    SRB_Flags : Byte;                     // ASPI request flags
    SRB_Hdr_Rsvd : DWORD;                 // Reserved, MUST = 0
    HA_Count : Byte;                      // Number of host adapters present
    HA_SCSI_ID : Byte;                    // SCSI ID of host adapter
    HA_ManagerId : array[0..15] of Byte;  // String describing the manager
    HA_Identifier : array[0..15] of Byte; // String describing the host adapter
    HA_Unique : array[0..15] of Byte;     // Host Adapter Unique parameters
    HA_Rsvd1 : Word;
  end;

  PSRB_HAInquiry = ^SRB_HAInquiry;
  TSRB_HAInquiry = SRB_HAInquiry;

{ ---------------------------------------------------------------------
     SRB - GET DEVICE TYPE - SC_GET_DEV_TYPE
  ---------------------------------------------------------------------}
  
  SRB_GDEVBlock = record
    SRB_Cmd,              // ASPI command code = SC_GET_DEV_TYPE
    SRB_Status,           // ASPI command status byte
    SRB_HaId,             // ASPI host adapter number
    SRB_Flags : BYTE;     // Reserved
    SRB_Hdr_Rsvd : DWORD; // Reserved
    SRB_Target,           // Target's SCSI ID
    SRB_Lun,              // Target's LUN number
    SRB_DeviceType,       // Target's peripheral device type
    SRB_Rsvd1 : BYTE;
  end;

  TSRB_GDEVBlock = SRB_GDEVBlock;
  PSRB_GDEVBlock = ^SRB_GDEVBlock;

{ ---------------------------------------------------------------------
    SRB - EXECUTE SCSI COMMAND - SC_EXEC_SCSI_CMD
  ---------------------------------------------------------------------}
  
  SRB_ExecSCSICmd = record
    SRB_Cmd,                   // ASPI command code = SC_EXEC_SCSI_CMD
    SRB_Status,                // ASPI command status byte
    SRB_HaId,                  // ASPI host adapter number
    SRB_Flags : BYTE;          // ASPI request flags
    SRB_Hdr_Rsvd : DWORD;      // Reserved
    SRB_Target,                // Target's SCSI ID
    SRB_Lun : BYTE;            // Target's LUN number
    SRB_Rsvd1 : WORD;          // Reserved for Alignment
    SRB_BufLen : DWORD;        // Data Allocation Length
    SRB_BufPointer : Pointer;  // Data Buffer Pointer
    SRB_SenseLen,              // Sense Allocation Length
    SRB_CDBLen,                // CDB Length
    SRB_HaStat,                // Host Adapter Status
    SRB_TargStat : BYTE;       // Target Status
    SRB_PostProc,              // Post routine
    SRB_Rsvd2 : Pointer;       // Reserved
    SRB_Rsvd3,                      // Reserved for alignment
    CDBByte : array[0..15] of byte; // SCSI CDB
    SenseArea : array[0..SENSE_LEN + 1] of byte; // Request Sense buffer
  end;

  TSRB_ExecSCSICmd = SRB_ExecSCSICmd;
  PSRB_ExecSCSICmd = ^SRB_ExecSCSICmd;


{ ---------------------------------------------------------------------
    SRB - ABORT AN SRB - SC_ABORT_SRB
  ---------------------------------------------------------------------}
  
  SRB_Abort = record
    SRB_Cmd,               // ASPI command code = SC_EXEC_SCSI_CMD
    SRB_Status,            // ASPI command status byte
    SRB_HaId,              // ASPI host adapter number
    SRB_Flags : BYTE;      // Reserved
    SRB_Hdr_Rsvd : DWORD;  // Reserved
    SRB_ToAbort : Pointer; // Pointer to SRB to abort
  end;

  TSRB_Abort = SRB_Abort;
  PSRB_Abort = ^SRB_Abort;

{ ---------------------------------------------------------------------
    SRB - BUS DEVICE RESET - SC_RESET_DEV
  ---------------------------------------------------------------------}

  SRB_BusDeviceReset = record
    SRB_Cmd,                          // ASPI command code = SC_EXEC_SCSI_CMD
    SRB_Status,                       // ASPI command status byte
    SRB_HaId,                         // ASPI host adapter number
    SRB_Flags : BYTE;                 // Reserved
    SRB_Hdr_Rsvd : DWORD;             // Reserved
    SRB_Target,                       // Target's SCSI ID
    SRB_Lun : BYTE;                   // Target's LUN number
    SRB_Rsvd1 : array[0..11] of byte; // Reserved for Alignment
    SRB_HaStat,                       // Host Adapter Status
    SRB_TargStat : BYTE;              // Target Status
    SRB_PostProc,                     // Post routine
    SRB_Rsvd2 : Pointer;              // Reserved
    SRB_Rsvd3,                        // Reserved
    CDBByte : array[0..15] of byte;   // SCSI CDB
  end;

  TSRB_BusDeviceReset = SRB_BusDeviceReset;
  PSRB_BusDeviceReset = ^SRB_BusDeviceReset;

{ ---------------------------------------------------------------------
     SRB - GET DISK INFORMATION - SC_GET_DISK_INFO
  ---------------------------------------------------------------------}

  SRB_GetDiskInfo = record
    SRB_Cmd,              // ASPI command code = SC_EXEC_SCSI_CMD
    SRB_Status,           // ASPI command status byte
    SRB_HaId,             // ASPI host adapter number
    SRB_Flags : BYTE;     // Reserved
    SRB_Hdr_Rsvd : DWORD; // Reserved
    SRB_Target,           // Target's SCSI ID
    SRB_Lun,              // Target's LUN number
    SRB_DriveFlags,       // Driver flags
    SRB_Int13HDriveInfo,  // Host Adapter Status
    SRB_Heads,            // Preferred number of heads translation
    SRB_Sectors : BYTE;   // Preferred number of sectors translation
    SRB_Rsvd1 : array[0..9] of byte; // Reserved
  end;

  TSRB_GetDiskInfo = SRB_GetDiskInfo;
  PSRB_GetDiskInfo = ^SRB_GetDiskInfo;

type
  TSendASPI32Command = function( LPSRB : Pointer ) : DWORD; cdecl;
  TGetASPI32SupportInfo = function : DWORD; cdecl;
  
Const
  SendASPI32Command : TSendASPI32Command = nil;
  GetASPI32SupportInfo : TGetASPI32SupportInfo = nil;

Function ASPILoaded : Boolean;
Procedure CheckASPI;
procedure UnloadASPI;

implementation

const
  HWNASPI : THandle = 0;
  WNASPI  : pchar = 'wnaspi32.dll';

Function ASPILoaded : Boolean;

begin
  Result:=HWNASPI<>0;
end;

Procedure CheckASPI;

begin
  HWNASPI:=LoadLibrary(WNASPI);
  if (HWNASPI<>0) then
    begin
    SendASPI32Command:=TSendASPI32Command(GetProcAddress(HWNASPI,'SendASPI32Command'));
    GetASPI32SupportInfo:=TGetASPI32SupportInfo(GetProcAddress(HWNASPI,'GetASPI32SupportInfo'));
    end
end;

procedure UnloadASPI;

begin
  if (HWNASPI<>0) then
    begin
    FreeLibrary(HWNASPI);
    HWNASPI:=0;
    SendASPI32Command:=nil;
    GetASPI32SupportInfo:=nil;
    end;
end;

initialization
  CheckAspi;

finalization
  UnloadASPI;
end.