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Protocols — PCI Bus Support
Version 1.10 12/01/02 12-91
Description
The GetBarAttributes() function returns in Supports the mask of attributes that the PCI
controller supports setting for the BAR specified by BarIndex. It also returns in Resources a
list of ACPI 2.0 resource descriptors for the BAR specified by BarIndex. Both Supports and
Resources are optional parameters. If both Supports and Resources are NULL, then
EFI_INVALID_PARAMETER is returned. It is the caller’s responsibility to free Resources
with the Boot Service FreePool()
when the caller is done with the contents of Resources. If
there are not enough resources to allocate Resources, then EFI_OUT_OF_RESOURCES is
returned.
If a bit is set in Supports, then the PCI controller supports this attribute type for the BAR
specified by BarIndex, and a call can be made to SetBarAttributes()
using that
attribute type.
Status Codes Returned
EFI_SUCCESS
If
Supports is not NULL, then the attributes that the PCI
controller supports are returned in
Supports. If Resources
is not
NULL, then the ACPI 2.0 resource descriptors that the PCI
controller is currently using are returned in
Resources.
EFI_OUT_OF_RESOURCES There are not enough resources available to allocate
Resources.
EFI_UNSUPPORTED
BarIndex not valid for this PCI controller.
EFI_INVALID_PARAMETER
Both
Supports and Attributes are NULL.