feat(OS): Create basic kernel that can be run through both QEMU and on hardware (#1)

Reviewed-on: #1

src/main.rs

@@ -0,0 +1,20 @@
+// Helper amin that will allow the kernel of FerrOS to be run through QEMU with just the "cargo run" command
+
+fn main() {
+    // read env variables that were set in build script
+    let uefi_path = env!("UEFI_PATH");
+    let bios_path = env!("BIOS_PATH");
+    
+    // choose whether to start the UEFI or BIOS image
+    let uefi = true;
+
+    let mut cmd = std::process::Command::new("qemu-system-x86_64");
+    if uefi {
+        cmd.arg("-bios").arg(ovmf_prebuilt::ovmf_pure_efi());
+        cmd.arg("-drive").arg(format!("format=raw,file={uefi_path}"));
+    } else {
+        cmd.arg("-drive").arg(format!("format=raw,file={bios_path}"));
+    }
+    let mut child = cmd.spawn().unwrap();
+    child.wait().unwrap();
+}