Intel Extensible Firmware Interface - Manual (Page 459)

Protocols — PCI Bus Support
Version 1.10 12/01/02 12-41
Table 12-2. ACPI 2.0 QWORD Address Space Descriptor
Byte
Offset Byte
Length
Data
Description
0x00 0x01 0x8A QWORD Address Space Descriptor
0x01 0x02 0x2B Length of this descriptor in bytes not including the first two fields
0x03 0x01 Resource Type
0 – Memory Range
1 – I/O Range
2 – Bus Number Range
0x04 0x01 General Flags
0x05 0x01 Type Specific Flags
0x06 0x08 Address Space Granularity
0x0E 0x08 Address Range Minimum
0x16 0x08 Address Range Maximum
0x1E 0x08 Address Translation Offset
0x26 0x08 Address Length
Table 12-3. ACPI 2.0 End Tag
Byte
Offset Byte
Length
Data
Description
0x00 0x01 0x79 End Tag
0x01 0x01 0x00 Checksum. If 0, then checksum is assumed to be valid.
Description
The Configuration() function retrieves a set of ACPI 2.0 resource descriptors that contains
the current configuration of this PCI root bridge. If the current configuration can be retrieved, then
it is returned in
Resources and EFI_SUCCESS is returned. See “Related Definitions” below for
the resource descriptor types that are supported by this function. If the current configuration cannot
be retrieved, then
EFI_UNSUPPORTED is returned.
Status Codes Returned
EFI_SUCCESS The current configuration of this PCI root bridge was returned in
Resources .
EFI_UNSUPPORTED The current configuration of this PCI root bridge could not be
retrieved.