Struct BootGraphicsResourceTable 

#[repr(C, packed(1))]
pub struct BootGraphicsResourceTable {
    pub header: SDTHeader,
    pub version: u16,
    pub status: u8,
    pub image_type: u8,
    pub image_address: u64,
    pub image_offset_x: u32,
    pub image_offset_y: u32,
}

Boot Graphics Resource Table (BGRT)

The Boot Graphics Resource Table (BGRT) is an optional table that provides a mechanism to indicate that an image was drawn on the screen during boot, and some information about the image.

The table is written when the image is drawn on the screen. This should be done after it is expected that any firmware components that may write to the screen are done doing so and it is known that the image is the only thing on the screen. If the boot path is interrupted (e.g., by a key press), the Displayed bit within the status field should be changed to 0 to indicate to the OS that the current image is invalidated.

This table is only supported on UEFI systems.

Fields

header: SDTHeader

• Signature - “BGRT”

version: u16

2-bytes (16 bit) version ID. This value must be 1.

status: u8

• Bits [[7:3]] - Reserved
• Bits [[2:1]] - Orientation Offset. These bits describe the clockwise degree offset from the image’s default orientation.
  • 0b00 - 0, no offset
  • 0b01 - 90
  • 0b10 - 180
  • 0b11 - 270
• Bit [[0]] - Displayed. A one indicates the boot image graphic is displayed.

image_type: u8

• 0x00 - Bitmap

The rest of the values are reserved.

image_address: u64

8-byte (64 bit) physical address pointing to the firmware’s in-memory copy of the image bitmap.

image_offset_x: u32

A 4-byte (32-bit) unsigned long describing the display X-offset of the boot image.

(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).

image_offset_y: u32

A 4-byte (32-bit) unsigned long describing the display Y-offset of the boot image.

(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).

Trait Implementations

impl Clone for BootGraphicsResourceTable

fn clone(&self) -> BootGraphicsResourceTable

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for BootGraphicsResourceTable