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feat(shim): initial shim support

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This commit is contained in:
Alex Zenla
2025-10-30 21:38:49 -04:00
parent 20932695e3
commit 92f611e9a8
6 changed files with 249 additions and 40 deletions
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31
src/drivers.rs
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@@ -1,4 +1,5 @@
use crate::context::SproutContext;
use crate::integrations::shim::{ShimInput, ShimSupport};
use crate::utils;
use anyhow::{Context, Result};
use log::info;
@@ -6,7 +7,6 @@ use serde::{Deserialize, Serialize};
use std::collections::BTreeMap;
use std::rc::Rc;
use uefi::boot::SearchType;
use uefi::proto::device_path::LoadedImageDevicePath;
/// Declares a driver configuration.
/// Drivers allow extending the functionality of Sprout.
@@ -23,28 +23,17 @@ pub struct DriverDeclaration {
fn load_driver(context: Rc<SproutContext>, driver: &DriverDeclaration) -> Result<()> {
// Acquire the handle and device path of the loaded image.
let sprout_image = uefi::boot::image_handle();
let image_device_path_protocol =
uefi::boot::open_protocol_exclusive::<LoadedImageDevicePath>(sprout_image)
.context("unable to open loaded image device path protocol")?;
// Get the device path root of the sprout image.
let mut full_path = utils::device_path_root(&image_device_path_protocol)?;
// Push the path of the driver from the root.
full_path.push_str(&context.stamp(&driver.path));
// Convert the path to a device path.
let device_path = utils::text_to_device_path(&full_path)?;
// Load the driver image.
let image = uefi::boot::load_image(
sprout_image,
uefi::boot::LoadImageSource::FromDevicePath {
device_path: &device_path,
boot_policy: uefi::proto::BootPolicy::ExactMatch,
},
// Resolve the path to the driver image.
let resolved = utils::resolve_path(
context.root().loaded_image_path()?,
&context.stamp(&driver.path),
)
.context("unable to load image")?;
.context("unable to resolve path to driver")?;
// Load the driver image using the shim support integration.
// It will determine if the image needs to be loaded via the shim or can be loaded directly.
let image = ShimSupport::load(sprout_image, ShimInput::ResolvedPath(&resolved))?;
// Start the driver image, this is expected to return control to sprout.
// There is no guarantee that the driver will actually return control as it is