From c8de43bf43242c4ebac3d0ecb8e7951fe2371506 Mon Sep 17 00:00:00 2001
From: Nathan Ringo <nathan@remexre.com>
Date: Sat, 24 Feb 2024 22:03:49 -0600
Subject: Initial commit

---
 kernel/src/lib.rs   | 16 ++++++++++++++++
 kernel/src/panic.rs | 12 ++++++++++++
 2 files changed, 28 insertions(+)
 create mode 100644 kernel/src/lib.rs
 create mode 100644 kernel/src/panic.rs

(limited to 'kernel/src')

diff --git a/kernel/src/lib.rs b/kernel/src/lib.rs
new file mode 100644
index 0000000..bd5a19f
--- /dev/null
+++ b/kernel/src/lib.rs
@@ -0,0 +1,16 @@
+#![no_std]
+
+mod panic;
+
+/// The entrypoint to the kernel. This should be executed by hart0 alone. It performs some early
+/// boot tasks, then wakes up any other harts.
+#[no_mangle]
+pub extern "C" fn hart0_boot() {
+    for byte in "Hello, world!\n".bytes() {
+        unsafe {
+            core::ptr::write_volatile(0x10000000 as *mut u8, byte);
+        }
+    }
+
+    todo!()
+}
diff --git a/kernel/src/panic.rs b/kernel/src/panic.rs
new file mode 100644
index 0000000..ed6e5d4
--- /dev/null
+++ b/kernel/src/panic.rs
@@ -0,0 +1,12 @@
+use core::panic::PanicInfo;
+
+#[panic_handler]
+fn panic(_info: &PanicInfo) -> ! {
+    loop {
+        for byte in "panic\n".bytes() {
+            unsafe {
+                core::ptr::write_volatile(0x10000000 as *mut u8, byte);
+            }
+        }
+    }
+}
-- 
cgit v1.2.3