From 337b8bb36be5d7c0758fe83a12ba037869346bce Mon Sep 17 00:00:00 2001
From: "Justin C. Miller" <justin@devjustinian.com>
Date: Thu, 31 Aug 2023 19:43:26 -0700
Subject: [PATCH] [panic] Don't spin the CPU in panic

While waiting for the main panicing CPU to finish, don't spin the CPU
without using `asm("pause")` to lower power consumption. Some panics can
get stuck in this state and oh man do my fans spin up.
---
 src/kernel/panic.serial/main.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/kernel/panic.serial/main.cpp b/src/kernel/panic.serial/main.cpp
index c5e1833..5ca49ff 100644
--- a/src/kernel/panic.serial/main.cpp
+++ b/src/kernel/panic.serial/main.cpp
@@ -30,7 +30,7 @@ void panic_handler(const cpu_state *regs)
     // If we're not running on the CPU that panicked, wait
     // for it to finish
     if (!panic) {
-        while (!main_cpu_done);
+        while (!main_cpu_done) asm ("pause");
     } else {
         new (&com1) panicking::serial_port {panicking::COM1};
         new (&syms) panicking::symbol_table {panic->symbol_data};