DDI versioning

SVR5 uses the SCO SVR5 2.0 system of DDI versioning. This has the following implications for drivers:

• The beginning of every DDI 8 driver source file must include the following line before any header files are #included:

     #define _DDI 8
  

  This line defines the ``major'' version number; it does not use full version numbers such as 8mp. As an alternative, this information can be suppled to the cc command line used to compile the driver:

     cc -D_KERNEL -D_DDI=8
  

• All device driver source code must #include the <sys/ddi.h> header file as the last of the included header files.

• Each DDI driver must include one $interface definition for the DDI version plus a $interface line for any other versioned interfaces being used. in its Master(DSP/4dsp) file. This controls the set of entry point routines and kernel functions that can be used in the driver. The manual pages include information about which interfaced versions support a given entry point routine or kernel function.

• Supplemental versioned interfaces are provided for specific device types:

  • MDI is used for network adapter cards. DDI 8 network adapter drivers should also conform to mdi: 2 or mdi: 2.1. See ``MDI''.

  • SDI is used for SCSI and non-SCSI drivers for Host Bus Adapter (HBA), target, layered, and RAID devices. DDI 8 drivers for mass storage devices should also conform to sdi: 4. See ``SDI''.

  • PSM is used to implement general support for a different multiprocessor system platform. See ``PSM (Platform Support Module)''.

  • I2O is used to implement support for I2O buses. See ``I2O''.

  • HPCI is used to implement hot plug support on a different system platform. See ``HPCI (Hot Plug Controller Interface)''.