GLD Driver Requirements
GLD-based drivers must include the header file <sys/gld.h>.
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GLD-based drivers must be linked with the -N“misc/gld” option:
GLD implements the open(9E) and close(9E) functions and the required STREAMS put(9E) and srv(9E) functions on behalf of the device-specific driver. GLD also implements the getinfo(9E) function for the driver.
The mi_idname element of the module_info(9S) structure is a string specifying the name of the driver. This must exactly match the name of the driver module as it exists in the file system.
The read-side qinit(9S) structure should specify the following elements:
NULL
gld_rsrv
gld_open
gld_close
The write-side qinit(9S) structure should specify these elements:
gld_wput
gld_wsrv
NULL
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NULL
The devo_getinfo element of the dev_ops(9S) structure should specify gld_getinfoas the getinfo(9E) routine.
The driver's attach(9E) function does all the work of associating the hardware-specific device driver with the GLD facility and preparing thedevice and driver for use.
The attach(9E) function allocates a gld_mac_info(9S) (``macinfo') structure using gld_mac_alloc(). The driver usually needs to save more information per device than is defined in the macinfo structure. It should allocate the additional required data structure and save a pointer to it inthe gldm_private member of the gld_mac_info(9S) structure.
The attach(9E) routine must initialize the macinfo structure as described in gld_mac_info(9S) and then call gld_register() to link the driver with the GLD module. The driver should map registers if necessary and be fully initialized and prepared to accept interrupts before calling gld_register().The attach(9E) function should add interrupts but not enable the device to generate them. The driver should reset the hardware before calling gld_register() to ensure it is quiescent. The device must notbe started or put into a state where it might generate an interrupt before gld_register() is called. That will be done later when GLD calls the driver's gldm_start() entry point, described in the gld(9E) man page. After gld_register() succeeds, the gld(9E) entry points might be called by GLD at any time.
The attach(9E) routine should return DDI_SUCCESS if gld_register() succeeds. If gld_register() fails, it returns DDI_FAILURE, and the attach(9E) routine should deallocate any resources it allocated before calling gld_register() and then also return DDI_FAILURE. Under no circumstances should a failed macinfostructure be reused; it should be deallocated using gld_mac_free().
The detach(9E)function should attempt to unregister the driver from GLD by calling gld_unregister() (described in gld(9F) man page). The detach(9E) routine can get a pointer to the needed gld_mac_info(9S) structure from the device's private data using ddi_get_driver_private(9F). gld_unregister() checks certain conditions that could require that the driver not be detached. If the checks fail, gld_unregister() returns DDI_FAILURE, in which case the driver's detach(9E) routine must leave the deviceoperational and return DDI_FAILURE.
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If the checks succeed, gld_unregister() ensures that the device interrupts are stopped (calling the driver's gldm_stop() routine if necessary), unlinks the driver from the GLD framework, and returns DDI_SUCCESS. In this case, the detach(9E) routine should remove interrupts, deallocate any data structures allocated in the attach(9E) routine (using gld_mac_free() todeallocate the macinfo structure), and return DDI_SUCCESS. The routine must remove the interrupt before calling gld_mac_free().