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implement loading of initramfs via the linux media initrd protocol

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This commit is contained in:
Alex Zenla
2025-10-12 20:22:24 -07:00
parent 9a52fa1d1c
commit 87944067d1
6 changed files with 204 additions and 12 deletions
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20
src/actions/chainload.rs
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@@ -1,5 +1,6 @@
use crate::context::SproutContext;
use crate::utils;
use crate::utils::linux_media_initrd::{register_linux_initrd, unregister_linux_initrd};
use anyhow::{Context, Result, bail};
use log::info;
use serde::{Deserialize, Serialize};
@@ -13,6 +14,8 @@ pub struct ChainloadConfiguration {
pub path: String,
#[serde(default)]
pub options: Vec<String>,
#[serde(default, rename = "linux-initrd")]
pub linux_initrd: Option<String>,
}
pub fn chainload(context: Rc<SproutContext>, configuration: &ChainloadConfiguration) -> Result<()> {
@@ -71,9 +74,24 @@ pub fn chainload(context: Rc<SproutContext>, configuration: &ChainloadConfigurat
options_holder = Some(options);
}
let mut initrd_handle = None;
if let Some(ref linux_initrd) = configuration.linux_initrd {
let initrd_path = context.stamp(linux_initrd);
let content =
utils::read_file_contents(&initrd_path).context("failed to read linux initrd")?;
initrd_handle = Some(
register_linux_initrd(content.into_boxed_slice())
.context("failed to register linux initrd")?,
);
}
let (base, size) = loaded_image_protocol.info();
info!("loaded image: base={:#x} size={:#x}", base.addr(), size);
uefi::boot::start_image(image).context("failed to start image")?;
let result = uefi::boot::start_image(image).context("failed to start image");
if let Some(initrd_handle) = initrd_handle {
unregister_linux_initrd(initrd_handle).context("failed to unregister linux initrd")?;
}
result.context("failed to start image")?;
drop(options_holder);
Ok(())
}