From 9660366219c28fc827c24ce7b428ad7e2534ead0 Mon Sep 17 00:00:00 2001
From: Nathan Lee <me@nwlee.tech>
Date: Sat, 26 Sep 2026 16:22:04 -0500
Subject: scaffold rest of website

---
 website-emu/src/dev.js   |  6 ++++++
 website-emu/src/lib.rs   | 27 ++++++++++++++++++---------
 website-emu/src/state.rs |  4 +++-
 3 files changed, 27 insertions(+), 10 deletions(-)
 create mode 100644 website-emu/src/dev.js

(limited to 'website-emu/src')

diff --git a/website-emu/src/dev.js b/website-emu/src/dev.js
new file mode 100644
index 0000000..4a22523
--- /dev/null
+++ b/website-emu/src/dev.js
@@ -0,0 +1,6 @@
+export function uart_push_line(line) {
+  const elem = document.createElement("span");
+  elem.classList.add("uart_line");
+  elem.textContent = line;
+  document.body.appendChild(elem);
+}
\ No newline at end of file
diff --git a/website-emu/src/lib.rs b/website-emu/src/lib.rs
index ffaa677..b29c901 100644
--- a/website-emu/src/lib.rs
+++ b/website-emu/src/lib.rs
@@ -16,20 +16,20 @@ const CONSOLE_LOAD: u32 = 0x70000000;
 
 const INITRD_LOAD: u32 = 0;
 
-#[wasm_bindgen]
+#[wasm_bindgen(module = "/src/dev.js")]
 extern "C" {
-    #[wasm_bindgen(js_namespace = console)]
-    fn log(s: &str);
+    fn uart_push_line(line: &str);
 }
 
 pub struct Uart {
     pub addr: u32,
-    pub value: u8
+    pub value: u8,
+    acc: String
 }
 
 impl MemoryDevice for Uart {
     fn read(&self, address: u32) -> Result<u8, ()> {
-        if (address == self.addr) {
+        if address == self.addr {
             Ok(self.value)
         } else {
             Err(())
@@ -37,8 +37,15 @@ impl MemoryDevice for Uart {
     }
 
     fn write(&mut self, address: u32, value: u8) -> Result<(), ()> {
-        if (address == self.addr) {
+        if address == self.addr {
             self.value = value;
+
+            if self.value as char == '\n' {
+                uart_push_line(self.acc.as_str());
+                self.acc = String::new();
+            } else {
+                self.acc.push(self.value as char);
+            }
             Ok(())
         } else {
             Err(())
@@ -76,7 +83,8 @@ pub fn boot(image: &[u8], initrd: &[u8], memory: &[u8]) {
 
     let uart = Uart {
         addr: CONSOLE_LOAD,
-        value: 0
+        value: 0,
+        acc: "".to_string(),
     };
 
     cpu_memory.register_device(
@@ -102,7 +110,7 @@ pub fn boot(image: &[u8], initrd: &[u8], memory: &[u8]) {
     state.registers[10] = 0;
     state.registers[2] = DRAM_LOAD + memory_len as u32;
 
-    loop {
+    while state.on {
         {
             handle_instruction(&mut state);
             state.registers[0] = 0;
@@ -278,7 +286,8 @@ fn handle_instruction(state: &mut CpuState) {
                         0 => trap_to_kernel(state),        // ecall
                         258 => return_to_userspace(state), // sret
                         261 => {
-                            println!("wfi");
+                            state.on = false;
+                            return;
                         }
                         _ => panic!("Illegal instruction: {:x}", word),
                     }
diff --git a/website-emu/src/state.rs b/website-emu/src/state.rs
index f26167f..4b32713 100644
--- a/website-emu/src/state.rs
+++ b/website-emu/src/state.rs
@@ -5,6 +5,7 @@ pub struct CpuState {
     pub registers: [u32; 32],
     pub csr: [u32; 4096],
     pub pc: u32,
+    pub on: bool
 }
 
 impl CpuState {
@@ -13,7 +14,8 @@ impl CpuState {
             memory,
             registers: [0u32; 32],
             csr: [0u32; 4096],
-            pc: 0
+            pc: 0,
+            on: true
         }
     }
 }
-- 
cgit v1.2.3