Coding changes

The following list summarizes the coding modifications required to port SCO OpenServer drivers to MDI version 2. These are in addition to the general changes required to port an SCO OpenServer driver to DDI (see ``Porting drivers to DDI 8'') and to port an SCO OpenServer STREAMS driver to DDI (see ``STREAMS in DDI 8'').

See the e3B and shrk sample source code that is provided in the ndsample package for examples of how these coding changes are implemented. The sample shrk driver compiles for UnixWare 7 by default, or for SCO OpenServer if the -DOPENSERVER flag is set.

• Delete all calls to the mdi_netboot(D3mdi) functions. DDI drivers use the configuration manager functions to query the resource manager database for the information returned by the mdi_netboot( ) functions; see ``Configuration manager'' and ``Resource manager database''.

• Delete all calls to the intr_disable( ) and intr_enable( ) functions. These functions should not be used in MDI drivers on either platform; single-threaded MDI drivers should instead use spl(D3) functions such as splstr( ) and splx( ).

• All MDI version 2 drivers must be dynamically loadable,

• Populate one or more bcfg(4dsp) files for the driver.

• ISA network adapter drivers define many configuration parameters in their bcfg files that are autoconfigured for other bus types. ISA drivers must also have a CFG_VERIFY subfunction to the config(D2mdi) entry point for DDI 8, or a _verify(D2mdi) entry point routine for DDI 7. See ``Extended ISA verify support'' for more information.

• When responding to the MDI ioctls MACIOC_SETMCA(7mdi) and MACIOC_DELMCA(7mdi), MDI version 2 drivers should not free the b_cont member of the msgb(D4str) STREAMS message block structure for either M_IOCNAK(D7str) or M_IOCACK(D7str) message types. See the Intro(7mdi) manual page for more information.

• Use drv_priv(D3) with iocp->ioc_cr when handling M_IOCTL messages instead of looking at iocp->ioc_uid. See Intro(7mdi) for more information.

• Call mdi_get_unit(D3mdi) in the _load(D2mdi) entry point routine.