add dmesg-y lines

src/main.rs

@@ -74,6 +74,8 @@ fn init() -> Result<()> {
 
     init_console()?;
 
+    system::dmesg("EnclaveOS Booted");
+
     std::thread::sleep(std::time::Duration::from_secs(500));
 
     /*
@@ -110,11 +112,13 @@ fn init() -> Result<()> {
 }
 
 fn init_console() -> Result<(), result::CtxError> {
-    Ok(for (filename, mode, fd) in [
+    for (filename, mode, fd) in [
         ("/dev/console", "r", 0),
         ("/dev/console", "w", 1),
         ("/dev/console", "w", 2),
     ] {
         system::syscall::freopen(filename, mode, &fd)?;
-    })
+    }
+
+    Ok(())
 }

src/system/mod.rs

@@ -4,6 +4,11 @@ use std::path::{Path, PathBuf};
 
 pub mod syscall;
 
+pub fn dmesg(value: impl std::fmt::Display) {
+    let timespec = syscall::clock_gettime(libc::CLOCK_BOOTTIME).unwrap();
+    eprintln!("[{: >5}.{}]{value}", timespec.tv_sec, timespec.tv_nsec / 1000);
+}
+
 pub enum MountType {
     DevTmpFs,
     DevPts,
@@ -62,6 +67,11 @@ impl Mount {
     }
 
     pub fn mount_self(&self) -> Result<()> {
+        dmesg(format!(
+            "Mounting {source} to {target}",
+            source = self.source.display(),
+            target = self.target.display()
+        ));
         syscall::mount(
             &self.source,
             &self.target,

src/system/syscall.rs

@@ -15,6 +15,27 @@ use std::{
     path::Path,
 };
 
+pub fn clock_gettime(clock_id: libc::clockid_t) -> Result<libc::timespec> {
+    let mut t = libc::timespec {
+        tv_sec: 0,
+        tv_nsec: 0,
+    };
+
+    match unsafe { libc::clock_gettime(clock_id, std::ptr::from_mut(&mut t)) } {
+        0 => Ok(t),
+        -1 => {
+            // at this point, Err(ctx_os_error()) is starting to seem appealing
+            ctx_os_error(format_args!("error calling clock_gettime({clock_id}, ...)")).map(|()| {
+                libc::timespec {
+                    tv_sec: 0,
+                    tv_nsec: 0,
+                }
+            })
+        }
+        n => unreachable!("clock_gettime() syscall returned bad value: {n}"),
+    }
+}
+
 pub fn mount(
     src: impl AsRef<Path>,
     target: impl AsRef<Path>,