Reset buffer limit after reading root dir

Author: phil-opp

Diff for: bios/second_stage/src/disk.rs

@@ -95,6 +95,12 @@ pub struct AlignedArrayBuffer<const LEN: usize> {
     pub limit: usize,
 }
 
+impl<const LEN: usize> AlignedArrayBuffer<LEN> {
+    pub fn reset_limit(&mut self) {
+        self.limit = LEN;
+    }
+}
+
 pub trait AlignedBuffer {
     fn slice(&self) -> &[u8];
     fn slice_mut(&mut self) -> &mut [u8];

Diff for: bios/second_stage/src/main.rs

@@ -82,6 +82,7 @@ pub extern "C" fn _start(disk_number: u16, partition_table_start: *const u8) {
     let kernel = fs
         .find_file_in_root_dir("kernel-x86_64", disk_buffer)
         .expect("no `kernel-x86_64` file found");
+    disk_buffer.reset_limit();
 
     for cluster in fs.file_clusters(&kernel) {
         let cluster = cluster.unwrap();