Better virtual file system, keyboard through MMIO&VirtIO

user/test_pic/src/main.rs

@@ -1,5 +1,7 @@
 #![no_std]
 #![no_main]
+
+use os_std::syscall;
 os_std::custom_std_setup! {}
 
 fn main() {
@@ -9,5 +11,13 @@ fn main() {
     for _ in 0..100 {
         test.push('C');
     }
-    println!("Hello from PIC program loaded dynamically with custom std and a better justfile, and syscalls ! {}", test);
+    // let mut file = syscall::open("/dev/fb0");
+    // syscall::seek(&mut file, SeekFrom::End(-3));
+    // syscall::write(&mut file, &[255; 6400 * 50]);
+    let mut file = syscall::open("/dev/tty0");
+    syscall::write(&mut file, b"Hi !\nnice tty\x08");
+    println!(
+        "Hello from PIC program loaded dynamically with custom std and a better justfile, and syscalls ! {}",
+        test
+    );
 }