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/Cargo.lock   |  7 +++++++
 kernel/Cargo.toml   | 12 ++++++++++++
 kernel/default.nix  |  9 +++++++++
 kernel/src/lib.rs   | 16 ++++++++++++++++
 kernel/src/panic.rs | 12 ++++++++++++
 5 files changed, 56 insertions(+)
 create mode 100644 kernel/Cargo.lock
 create mode 100644 kernel/Cargo.toml
 create mode 100644 kernel/default.nix
 create mode 100644 kernel/src/lib.rs
 create mode 100644 kernel/src/panic.rs

(limited to 'kernel')

diff --git a/kernel/Cargo.lock b/kernel/Cargo.lock
new file mode 100644
index 0000000..0dd1539
--- /dev/null
+++ b/kernel/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "kernel"
+version = "0.1.0"
diff --git a/kernel/Cargo.toml b/kernel/Cargo.toml
new file mode 100644
index 0000000..cef382e
--- /dev/null
+++ b/kernel/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "kernel"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+crate-type = ["staticlib"]
+
+[dependencies]
+
+[profile.release]
+debug = true
diff --git a/kernel/default.nix b/kernel/default.nix
new file mode 100644
index 0000000..46352fb
--- /dev/null
+++ b/kernel/default.nix
@@ -0,0 +1,9 @@
+{ rust }:
+
+let toml = builtins.fromTOML (builtins.readFile ./Cargo.toml);
+in rust.buildRustPackage {
+  pname = toml.package.name;
+  version = toml.package.version;
+  src = ./.;
+  cargoLock.lockFile = ./Cargo.lock;
+}
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);
+            }
+        }
+    }
+}
-- 
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