devflag(D1)

NAME
     devflag - driver flags

SYNOPSIS
     #include <sys/conf.h>
     #include <sys/ddi.h>
     int prefixdevflag = 0;

DESCRIPTION
     Every driver must define a global integer variable called prefixdevflag.
     This variable contains a bitmask of flags used to specify the driver's
     characteristics to the system.

     The valid flags that may be set in prefixdevflag are:

          D_MP                The driver is multithreaded (it handles its own
                              locking and serialization).

          D_WBACK             Writes back cache before strategy routine.

          D_OLD               The driver uses the old-style interface (pre-5.0
                              release).

     If no flags are set for the driver, then prefixdevflag should be set to
     0. If this is not done, then lboot will assume that this is an old style
     drive, and it will set D_OLD flag as a default.

REFERENCES
     physiock(D3)