scsibus.c

来自「EFI BIOS是Intel提出的下一代的BIOS标准。这里上传的Edk源代码是」· C语言 代码 · 共 1,046 行 · 第 1/3 页

      //
      // Remaining Device Path is not NULL, only scan the specified Pun.
      //
      Pun           = StartPun;
      Lun           = StartLun;
      ScanOtherPuns = FALSE;
    }
    //
    // Avoid creating handle for the host adapter.
    //
    if (ScsiBusDev->ExtScsiSupport) {
      if (Pun == ScsiBusDev->ExtScsiInterface->Mode->AdapterId) {
        continue;
      }
    } else {
      if (Pun == ScsiBusDev->ScsiInterface->Mode->AdapterId) {
        continue;
      }
    }
    //
    // Scan for the scsi device, if it attaches to the scsi bus,
    // then create handle and install scsi i/o protocol.
    //
    Status = ScsiScanCreateDevice (This, Controller, Pun, Lun, ScsiBusDev);
  }
  return Status;
}

EFI_STATUS
EFIAPI
SCSIBusDriverBindingStop (
  IN  EFI_DRIVER_BINDING_PROTOCOL     *This,
  IN  EFI_HANDLE                      Controller,
  IN  UINTN                           NumberOfChildren,
  IN  EFI_HANDLE                      *ChildHandleBuffer
  )
/*++

Routine Description:

  Stop this driver on ControllerHandle. Support stoping any child handles
  created by this driver.

Arguments:

  This              - Protocol instance pointer.
  Controller        - Handle of device to stop driver on
  NumberOfChildren  - Number of Children in the ChildHandleBuffer
  ChildHandleBuffer - List of handles for the children we need to stop.

Returns:

  EFI_SUCCESS
  Others
--*/
{
  EFI_STATUS                  Status;
  BOOLEAN                     AllChildrenStopped;
  UINTN                       Index;
  EFI_SCSI_IO_PROTOCOL        *ScsiIo;
  SCSI_IO_DEV                 *ScsiIoDevice;
  VOID                        *ScsiPassThru;
  EFI_SCSI_BUS_PROTOCOL       *Scsidentifier;
  SCSI_BUS_DEVICE             *ScsiBusDev;

  if (NumberOfChildren == 0) {
    //
    // Get the SCSI_BUS_DEVICE
    //
    Status = gBS->OpenProtocol (
                    Controller,
                    &mScsiBusProtocolGuid,
                    (VOID **) &Scsidentifier,
                    This->DriverBindingHandle,
                    Controller,
                    EFI_OPEN_PROTOCOL_GET_PROTOCOL
                    );
  
    if (EFI_ERROR (Status)) {
      return EFI_DEVICE_ERROR;
    }

    ScsiBusDev = SCSI_BUS_CONTROLLER_DEVICE_FROM_THIS (Scsidentifier);

    //
    // Uninstall SCSI Bus Protocol
    //
    gBS->UninstallProtocolInterface (
           Controller,
           &mScsiBusProtocolGuid,
           &ScsiBusDev->BusIdentify
           );
    
    //
    // Close the bus driver
    //
    if (ScsiBusDev->ExtScsiSupport) {
      gBS->CloseProtocol (
             Controller,
             &gEfiExtScsiPassThruProtocolGuid,
             This->DriverBindingHandle,
             Controller
             );
    } else {
      gBS->CloseProtocol (
             Controller,
             &gEfiScsiPassThruProtocolGuid,
             This->DriverBindingHandle,
             Controller
             );
    }

    gBS->CloseProtocol (
           Controller,
           &gEfiDevicePathProtocolGuid,
           This->DriverBindingHandle,
           Controller
           );
    gBS->FreePool (ScsiBusDev);
    return EFI_SUCCESS;
  }

  AllChildrenStopped = TRUE;

  for (Index = 0; Index < NumberOfChildren; Index++) {

    Status = gBS->OpenProtocol (
                    ChildHandleBuffer[Index],
                    &gEfiScsiIoProtocolGuid,
                    (VOID **) &ScsiIo,
                    This->DriverBindingHandle,
                    Controller,
                    EFI_OPEN_PROTOCOL_GET_PROTOCOL
                    );
    if (EFI_ERROR (Status)) {
      AllChildrenStopped = FALSE;
      continue;
    }

    ScsiIoDevice = SCSI_IO_DEV_FROM_THIS (ScsiIo);
    //
    // Close the child handle
    //
    if (ScsiIoDevice->ExtScsiSupport) {
      Status = gBS->CloseProtocol (
                      Controller,
                      &gEfiExtScsiPassThruProtocolGuid,
                      This->DriverBindingHandle,
                      ChildHandleBuffer[Index]
                      );

    } else {
      Status = gBS->CloseProtocol (
                      Controller,
                      &gEfiScsiPassThruProtocolGuid,
                      This->DriverBindingHandle,
                      ChildHandleBuffer[Index]
                      );
    }

    Status = gBS->UninstallMultipleProtocolInterfaces (
                    ChildHandleBuffer[Index],
                    &gEfiDevicePathProtocolGuid,
                    ScsiIoDevice->DevicePath,
                    &gEfiScsiIoProtocolGuid,
                    &ScsiIoDevice->ScsiIo,
                    NULL
                    );
    if (EFI_ERROR (Status)) {
      AllChildrenStopped = FALSE;
      if (ScsiIoDevice->ExtScsiSupport) {
        gBS->OpenProtocol (
               Controller,
               &gEfiExtScsiPassThruProtocolGuid,
               &(EFI_EXT_SCSI_PASS_THRU_PROTOCOL*)ScsiPassThru,
               This->DriverBindingHandle,
               ChildHandleBuffer[Index],
               EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
               );
      } else {
        gBS->OpenProtocol (
               Controller,
               &gEfiScsiPassThruProtocolGuid,
               &(EFI_SCSI_PASS_THRU_PROTOCOL*)ScsiPassThru,
               This->DriverBindingHandle,
               ChildHandleBuffer[Index],
               EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
               );
      }
    } else {
      gBS->FreePool (ScsiIoDevice);
    }
  }

  if (!AllChildrenStopped) {
    return EFI_DEVICE_ERROR;
  }

  return EFI_SUCCESS;
}

EFI_STATUS
EFIAPI
ScsiGetDeviceType (
  IN  EFI_SCSI_IO_PROTOCOL     *This,
  OUT UINT8                    *DeviceType
  )
/*++

Routine Description:

  Retrieves the device type information of the SCSI Controller.
    
Arguments:

  This                  - Protocol instance pointer.
  DeviceType            - A pointer to the device type information
                            retrieved from the SCSI Controller. 

Returns:

  EFI_SUCCESS           - Retrieves the device type information successfully.
  EFI_INVALID_PARAMETER - The DeviceType is NULL.
  
--*/
{
  SCSI_IO_DEV *ScsiIoDevice;

  if (DeviceType == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  ScsiIoDevice  = SCSI_IO_DEV_FROM_THIS (This);
  *DeviceType   = ScsiIoDevice->ScsiDeviceType;
  return EFI_SUCCESS;
}

EFI_STATUS
EFIAPI
ScsiGetDeviceLocation (
  IN  EFI_SCSI_IO_PROTOCOL    *This,
  IN OUT UINT8                **Target,
  OUT UINT64                  *Lun
  )
/*++

Routine Description:

  Retrieves the device location in the SCSI channel.
    
Arguments:

  This                  - Protocol instance pointer.
  Target                - A pointer to the Target Array which represents ID of a SCSI device 
                          on the SCSI channel. 
  Lun                   - A pointer to the LUN of the SCSI device on 
                          the SCSI channel.

Returns:

  EFI_SUCCESS           - Retrieves the device location successfully.
  EFI_INVALID_PARAMETER - The Target or Lun is NULL.

--*/
{
  SCSI_IO_DEV *ScsiIoDevice;

  if (Target == NULL || Lun == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  ScsiIoDevice = SCSI_IO_DEV_FROM_THIS (This);

  (*Target)[0] = (UINT8) (ScsiIoDevice->Pun & 0xff);
  (*Target)[1] = (UINT8) ((ScsiIoDevice->Pun >> 8) & 0xff);
  (*Target)[2] = (UINT8) ((ScsiIoDevice->Pun >> 16) & 0xff);
  (*Target)[3] = (UINT8) ((ScsiIoDevice->Pun >> 24) & 0xff);

  *Lun         = ScsiIoDevice->Lun;

  return EFI_SUCCESS;
}

EFI_STATUS
EFIAPI
ScsiResetBus (
  IN  EFI_SCSI_IO_PROTOCOL     *This
  )
/*++

Routine Description:

  Resets the SCSI Bus that the SCSI Controller is attached to.
    
Arguments:

  This                  - Protocol instance pointer.

Returns:

  EFI_SUCCESS           - The SCSI bus is reset successfully.
  EFI_DEVICE_ERROR      - Errors encountered when resetting the SCSI bus.
  EFI_UNSUPPORTED       - The bus reset operation is not supported by the
                          SCSI Host Controller.
  EFI_TIMEOUT           - A timeout occurred while attempting to reset 
                          the SCSI bus.
--*/
{
  SCSI_IO_DEV *ScsiIoDevice;

  ScsiIoDevice = SCSI_IO_DEV_FROM_THIS (This);

  if (ScsiIoDevice->ExtScsiSupport){
    return ScsiIoDevice->ExtScsiPassThru->ResetChannel (ScsiIoDevice->ExtScsiPassThru);
  } else {
    return ScsiIoDevice->ScsiPassThru->ResetChannel (ScsiIoDevice->ScsiPassThru);
  }
}

EFI_STATUS
EFIAPI
ScsiResetDevice (
  IN  EFI_SCSI_IO_PROTOCOL     *This
  )
/*++

Routine Description:

  Resets the SCSI Controller that the device handle specifies.
    
Arguments:

  This                  - Protocol instance pointer.
    
Returns:

  EFI_SUCCESS           - Reset the SCSI controller successfully.
  EFI_DEVICE_ERROR      - Errors are encountered when resetting the
                          SCSI Controller.
  EFI_UNSUPPORTED       - The SCSI bus does not support a device 
                          reset operation.
  EFI_TIMEOUT           - A timeout occurred while attempting to 
                          reset the SCSI Controller.
--*/
{
  SCSI_IO_DEV  *ScsiIoDevice;
  UINT8        Target[4];

  ScsiIoDevice = SCSI_IO_DEV_FROM_THIS (This);