acpi/
bgrt.rs

1use crate::{
2    sdt::{SdtHeader, Signature},
3    AcpiTable,
4};
5use bit_field::BitField;
6
7/// The BGRT table contains information about a boot graphic that was displayed
8/// by firmware.
9#[repr(C, packed)]
10#[derive(Debug, Clone, Copy)]
11pub struct Bgrt {
12    header: SdtHeader,
13    pub version: u16,
14    status: u8,
15    image_type: u8,
16    pub image_address: u64,
17    image_offset_x: u32,
18    image_offset_y: u32,
19}
20
21/// ### Safety: Implementation properly represents a valid BGRT.
22unsafe impl AcpiTable for Bgrt {
23    const SIGNATURE: Signature = Signature::BGRT;
24
25    fn header(&self) -> &SdtHeader {
26        &self.header
27    }
28}
29
30impl Bgrt {
31    pub fn image_type(&self) -> ImageType {
32        let img_type = self.image_type;
33        match img_type {
34            0 => ImageType::Bitmap,
35            _ => ImageType::Reserved,
36        }
37    }
38
39    /// Gets the orientation offset of the image.
40    /// Degrees are clockwise from the images default orientation.
41    pub fn orientation_offset(&self) -> u16 {
42        let status = self.status;
43        match status.get_bits(1..3) {
44            0 => 0,
45            1 => 90,
46            2 => 180,
47            3 => 270,
48            _ => unreachable!(), // will never happen
49        }
50    }
51
52    pub fn was_displayed(&self) -> bool {
53        let status = self.status;
54        status.get_bit(0)
55    }
56
57    pub fn image_offset(&self) -> (u32, u32) {
58        let x = self.image_offset_x;
59        let y = self.image_offset_y;
60        (x, y)
61    }
62}
63
64#[repr(u8)]
65#[derive(Clone, Copy, Debug, Eq, PartialEq, Ord, PartialOrd, Hash)]
66pub enum ImageType {
67    Bitmap,
68    Reserved,
69}
acpi/bgrt.rs

acpi/
bgrt.rs
