simple file system

nel_os_bootloader/.cargo/config.toml

@@ -0,0 +1,5 @@
+[build]
+target = "x86_64-unknown-uefi"
+
+[target.x86_64-unknown-uefi]
+runner = "./run-qemu.sh"

nel_os_bootloader/Cargo.toml

@@ -5,4 +5,4 @@ edition = "2024"
 
 [dependencies]
 log = "0.4.27"
-uefi = { version = "0.35.0", features = ["logger", "panic_handler"] }
+uefi = { version = "0.35.0", features = ["logger", "panic_handler", "alloc"] }

nel_os_bootloader/run-qemu.sh

@@ -1,11 +1,14 @@
 #!/bin/sh
 
-cargo build --release --target x86_64-unknown-uefi
+EFI_BINARY="$1"
 
-cp target/x86_64-unknown-uefi/release/nel_os_bootloader.efi esp/efi/boot/bootx64.efi
+cp "$EFI_BINARY" esp/efi/boot/bootx64.efi
 
 qemu-system-x86_64 -enable-kvm \
     -m 4G \
+    -nographic \
+    -serial mon:stdio \
+    -no-reboot \
     -drive if=pflash,format=raw,readonly=on,file=OVMF_CODE.fd \
     -drive if=pflash,format=raw,readonly=on,file=OVMF_VARS.fd \
     -drive format=raw,file=fat:rw:esp

nel_os_bootloader/src/main.rs

@@ -1,8 +1,20 @@
 #![no_main]
 #![no_std]
 
+extern crate alloc;
+
 use core::arch::asm;
-use uefi::{boot::MemoryType, mem::memory_map::MemoryMap, prelude::*, println};
+use uefi::{
+    allocator::Allocator,
+    boot::{MemoryType, ScopedProtocol},
+    mem::memory_map::MemoryMap,
+    prelude::*,
+    println,
+    proto::media::{file::Directory, fs::SimpleFileSystem},
+};
+
+#[global_allocator]
+static ALLOCATOR: Allocator = Allocator;
 
 fn hlt_loop() -> ! {
     loop {
@@ -12,11 +24,18 @@ fn hlt_loop() -> ! {
     }
 }
 
+fn get_fs() -> Directory {
+    let mut fs: ScopedProtocol<SimpleFileSystem> =
+        uefi::boot::get_image_file_system(uefi::boot::image_handle()).unwrap();
+
+    fs.open_volume().unwrap()
+}
+
 #[entry]
 fn main() -> Status {
     uefi::helpers::init().unwrap();
 
-    uefi::system::with_stdout(|stdout| stdout.clear()).unwrap();
+    println!("\nnel_os bootloader");
 
     let memory_map = uefi::boot::memory_map(MemoryType::LOADER_DATA).unwrap();
     println!("memory_map len: {}", memory_map.len());
@@ -30,5 +49,16 @@ fn main() -> Status {
         println!("    PhysStart: {:?}", entry.phys_start);
     }
 
+    let mut root = get_fs();
+
+    println!("Root directory entries:");
+    while let Ok(Some(file_info)) = root.read_entry_boxed() {
+        if file_info.is_directory() {
+            println!("Directory: {}", file_info.file_name());
+        } else {
+            println!("File: {}", file_info.file_name());
+        }
+    }
+
     hlt_loop();
 }