get_info(9r)get_info(9r)NAMEget_info - General: Returns system-specific information
struct item_list *item_list );
Specifies a linked list of information requests.
The get_info routine returns system-specific data assigned to the hard‐
ware platform that the driver operates on. For example, a device driver
might request system-specific information for the following Alpha hard‐
ware platforms: DEC 3000 Model 300 AXP Workstation, DEC 3000 Model 500
AXP Workstation, and DEC 4000 Model 610 AXP System.
The get_info routine checks the function code that you pass in the
function member of the item_list data structure. If the hardware plat‐
form that the driver operates on supports the system item associated
with this function code, get_info returns the system-specific data for
the system item in the output_data member of the item_list structure.
For example, get_info returns the TURBOchannel clock speed in the out‐
put_data member of the item_list structure if you specify the constant
GET_TC_SPEED in the function member of the item_list structure.
The get_info routine then performs the identical checks for the rest of
the item_list structures in the linked list.
The get_info routine is a generic interface that maps to a hardware
platform-specific interface that actually returns the assigned CPU-spe‐
cific data for the specified CPU. Using this routine to obtain CPU-spe‐
cific information makes the driver more portable across different CPU
architectures and different CPU types within the same architecture.
The return value from the get_info routine depends on the following
issues: The hardware platform supports get_info
In this case, get_info returns the value TRUE. The hardware
platform does not support get_info
In this case, get_info returns the value NOT_SUPPORTED.
If get_info returns the value TRUE, it returns one of the following
values in the rtn_status member of the item_list data structure: Indi‐
cates that the hardware platform that the driver currently operates on
supports the requested system item. Indicates that the hardware plat‐
form that the driver operates on does not support the requested system
Routines: do_config(9r), get_config(9r)
Data Structures: item_list(9s)get_info(9r)