[hemu] add --log argument to specify the log level

src/log.rs

@@ -1,10 +1,10 @@
 use tracing::Level;
 use tracing_subscriber::{EnvFilter, FmtSubscriber};
 
-pub fn log_trace() {
+pub fn log_trace(level: Level) {
   let global_logger = FmtSubscriber::builder()
     .with_env_filter(EnvFilter::from_default_env())
-    .with_max_level(Level::TRACE)
+    .with_max_level(level)
     .without_time()
     .with_target(false)
     .compact()

src/main.rs

@@ -20,17 +20,28 @@ struct Args {
   #[arg(short = 'f', long = "file")]
   file: Option<PathBuf>,
 
+  /// Difftest
+  #[arg(short, long, default_value = "info")]
+  log: String,
+
   /// Difftest
   #[arg(short, long)]
   diff: bool,
+
+  /// Enable tui
+  #[arg(short, long)]
+  tui: bool
 }
 
 /// Main function of RISC-V emulator for the CLI version.
 fn main() -> anyhow::Result<()> {
-  log_trace();
-
   let args = Args::parse();
 
+  // Set the log level.
+  // "error", "warn", "info", "debug", "trace"
+  let level = args.log.parse()?;
+  log_trace(level);
+
   // Read the kernel bin(after objcopy) and the disk image.
   let mut kernel_file = File::open(args.kernel)?;
   let mut kernel_data = Vec::new();