.IX \f4devflag\fP(D1DK)

NAME

devflag − driver flags

SYNOPSIS

#include <sys/conf.h>
int prefixdevflag;

DESCRIPTION

Every new-style driver must define a global integer containing a bitmask of flags that indicate its characteristics to the system.  The valid flags that may be set are:

D_DMAThe driver does DMA (Direct Memory Access). 

D_NOBRKUP
The I/O job is not broken up along page boundaries into multiple jobs by the kernel.

D_NEWThe driver is a new-style driver. 

D_OLDThe driver is an old-style driver and the kernel should act accordingly to preserve compatibility. 

Prefixdevflag must have one of D_OLD or D_NEW set but not both. All other flags are optional. 

DDI