Advanced Configuration and Power Interface Specification

ACPI Software Programming Model
5.2.22.1 Version
The version field identifies which revision of the BGRT table is implemented. The version field
should be set to 1.
5.2.22.2 Status
Table 5-104 Status Description Field
Offset
Bit 0
Field Name
Displayed
The status field contains information about the current status of the table. The Valid bit is bit 0 of
the lowest byte. It should be set to 1 while the image resource is displayed on the screen, and set to
0 while it is not displayed.
All other bits are reserved.
5.2.22.3 Image Type
Table 5-105 Image Type Description Field
Value
Definition
0 Image Type is Bitmap
The Image type field contains information about the format of the image being returned. If the
value is 0, the Image Type is Bitmap. The format for a Bitmap is defined atthe reference located in
“Links to ACPI-Related Documents” (http://uefi.org/acpi) under the heading "Types of Bitmaps".
All other values not defined in the table are reserved for future use.
5.2.22.4 Image Address
The Image Address contains the location in memory where an in-memory copy of the boot image
can be found. The image should be stored in EfiBootServicesData, allowing the system to reclaim
the memory when the image is no longer needed.
Implementations must present the image in a 24 bit bitmap with pixel format 0xRRGGBB, or a32-
bit bitmap with the pixel format 0xrrRRGGBB, where ‘rr’ is reserved.
5.2.22.5 Image Offset
The Image Offset contains 2 consecutive 4 byte unsigned longs describing the (X, Y) display offset
of the top left corner of the boot image. The top left corner of the display is at offset (0, 0).
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