Function qemu_loader_append

dstack-mr/src/acpi.rs:375–415

Appends a serialized QEMU loader command to the data buffer.

(data: &mut Vec<u8>, cmd: LoaderCmd)

/// Appends a serialized QEMU loader command to the data buffer.
fn qemu_loader_append(data: &mut Vec<u8>, cmd: LoaderCmd) {
    match cmd {
        LoaderCmd::Allocate {
            file,
            alignment,
            zone,
        } => {
            data.extend_from_slice(&[0x01, 0x00, 0x00, 0x00]);
            append_fixed_string(data, file);
            data.extend_from_slice(&alignment.to_le_bytes());
            data.push(zone);
            data.resize(data.len() + 63, 0); // Padding
        }
        LoaderCmd::AddPtr {
            pointer_file,
            pointee_file,
            pointer_offset,
            pointer_size,
        } => {
            data.extend_from_slice(&[0x02, 0x00, 0x00, 0x00]);
            append_fixed_string(data, pointer_file);
            append_fixed_string(data, pointee_file);
            data.extend_from_slice(&pointer_offset.to_le_bytes());
            data.push(pointer_size);
            data.resize(data.len() + 7, 0); // Padding
        }
        LoaderCmd::AddChecksum {
            file,
            result_offset,
            start,
            length,
        } => {
            data.extend_from_slice(&[0x03, 0x00, 0x00, 0x00]);
            append_fixed_string(data, file);
            data.extend_from_slice(&result_offset.to_le_bytes());
            data.extend_from_slice(&start.to_le_bytes());
            data.extend_from_slice(&length.to_le_bytes());
            data.resize(data.len() + 56, 0); // Padding
        }
    }
}

/// ACPI table header (first 8 bytes of every ACPI table)
#[derive(Debug, Decode)]