68 lines
2.0 KiB
Rust
68 lines
2.0 KiB
Rust
use alloc::vec::Vec;
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use uefi::{prelude::*, CString16, Result};
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use crate::common::{boot_linux_unchecked, extract_string};
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use linux_bootloader::pe_section::pe_section;
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use linux_bootloader::uefi_helpers::booted_image_file;
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/// Extract bytes from a PE section.
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pub fn extract_bytes(pe_data: &[u8], section: &str) -> Result<Vec<u8>> {
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let bytes: Vec<u8> = pe_section(pe_data, section)
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.ok_or(Status::INVALID_PARAMETER)?
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.try_into()
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.map_err(|_| Status::INVALID_PARAMETER)?;
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Ok(bytes)
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}
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/// The configuration that is embedded at build time.
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///
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/// After this stub is built, configuration need to be embedded into the binary by adding PE
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/// sections. This struct represents that information.
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struct EmbeddedConfiguration {
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/// The kernel command-line.
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cmdline: CString16,
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/// The kernel as raw bytes.
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kernel: Vec<u8>,
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/// The initrd as raw bytes.
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initrd: Vec<u8>,
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}
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impl EmbeddedConfiguration {
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fn new(file_data: &[u8]) -> Result<Self> {
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Ok(Self {
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kernel: extract_bytes(file_data, ".linux")?,
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initrd: extract_bytes(file_data, ".initrd")?,
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cmdline: extract_string(file_data, ".cmdline")?,
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})
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}
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}
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pub fn boot_linux(handle: Handle, mut system_table: SystemTable<Boot>) -> Status {
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uefi_services::init(&mut system_table).unwrap();
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// SAFETY: We get a slice that represents our currently running
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// image and then parse the PE data structures from it. This is
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// safe, because we don't touch any data in the data sections that
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// might conceivably change while we look at the slice.
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let config = unsafe {
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EmbeddedConfiguration::new(
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booted_image_file(system_table.boot_services())
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.unwrap()
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.as_slice(),
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)
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.expect("Failed to extract configuration from binary.")
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};
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boot_linux_unchecked(
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handle,
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system_table,
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config.kernel,
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&config.cmdline,
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config.initrd,
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)
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.status()
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}
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