From a04cf2dbb8d2e890405fbf0a1022aaad3015b1e8 Mon Sep 17 00:00:00 2001
From: Christian Cunningham <cc@localhost>
Date: Fri, 26 Aug 2022 17:25:34 -0700
Subject: Modularize

---
 src/util/panic_wait.rs | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 src/util/panic_wait.rs

(limited to 'src/util/panic_wait.rs')

diff --git a/src/util/panic_wait.rs b/src/util/panic_wait.rs
new file mode 100644
index 0000000..a8d0962
--- /dev/null
+++ b/src/util/panic_wait.rs
@@ -0,0 +1,45 @@
+//! # Panic module
+//!
+//! A panic handler that infinitely waits
+
+use crate::{cpu, serial_println};
+use core::panic::PanicInfo;
+
+/// # Prevent Double Faulting
+///
+/// An atomic operation is used to mark that
+/// a fault has occurred. If it detects that
+/// there was already a fault, it spins to
+/// prevent a recursive faulting cycle.
+fn panic_prevent_reenter() {
+    use core::sync::atomic::{AtomicBool, Ordering};
+
+    static PANIC_IN_PROGRESS: AtomicBool = AtomicBool::new(false);
+
+    if !PANIC_IN_PROGRESS.load(Ordering::Relaxed) {
+        PANIC_IN_PROGRESS.store(true, Ordering::Relaxed);
+        return;
+    }
+
+    cpu::wait_forever()
+}
+
+/// # Panic handler
+#[panic_handler]
+fn panic(info: &PanicInfo) -> ! {
+    panic_prevent_reenter();
+
+    let (location, line, column) = match info.location() {
+        Some(loc) => (loc.file(), loc.line(), loc.column()),
+        _ => ("???", 0, 0),
+    };
+
+    serial_println!(
+        "Kernel panic!\n\nPanic Location:\n\tFile: '{}', line {}, column {}\n\n{}",
+        location,
+        line,
+        column,
+        info.message().unwrap_or(&format_args!("")),
+    );
+    cpu::wait_forever()
+}
-- 
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