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use crate::{
sdt::{SdtHeader, Signature},
AcpiTable,
};
use bit_field::BitField;
/// The BGRT table contains information about a boot graphic that was displayed
/// by firmware.
#[repr(C, packed)]
#[derive(Debug, Clone, Copy)]
pub struct Bgrt {
header: SdtHeader,
pub version: u16,
status: u8,
image_type: u8,
pub image_address: u64,
image_offset_x: u32,
image_offset_y: u32,
}
/// ### Safety: Implementation properly represents a valid BGRT.
unsafe impl AcpiTable for Bgrt {
const SIGNATURE: Signature = Signature::BGRT;
fn header(&self) -> &SdtHeader {
&self.header
}
}
impl Bgrt {
pub fn image_type(&self) -> ImageType {
let img_type = self.image_type;
match img_type {
0 => ImageType::Bitmap,
_ => ImageType::Reserved,
}
}
/// Gets the orientation offset of the image.
/// Degrees are clockwise from the images default orientation.
pub fn orientation_offset(&self) -> u16 {
let status = self.status;
match status.get_bits(1..3) {
0 => 0,
1 => 90,
2 => 180,
3 => 270,
_ => unreachable!(), // will never happen
}
}
pub fn was_displayed(&self) -> bool {
let status = self.status;
status.get_bit(0)
}
pub fn image_offset(&self) -> (u32, u32) {
let x = self.image_offset_x;
let y = self.image_offset_y;
(x, y)
}
}
#[repr(u8)]
#[derive(Clone, Copy, Debug, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub enum ImageType {
Bitmap,
Reserved,
}
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