From 43d945b5e87685e68bc8d328b9f7d0b6e635d7c9 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Sun, 4 Sep 2022 23:03:20 -0400
Subject: [PATCH] Enable interrupts and halt CPU

---
 src/hos/cpu.d   | 10 ++++++++++
 src/hulk/hulk.d |  3 +++
 2 files changed, 13 insertions(+)

diff --git a/src/hos/cpu.d b/src/hos/cpu.d
index 4b83603..9fb02ad 100644
--- a/src/hos/cpu.d
+++ b/src/hos/cpu.d
@@ -5,6 +5,16 @@ void cli()
     __asm("cli", "");
 }
 
+void sti()
+{
+    __asm("sti", "");
+}
+
+void hlt()
+{
+    __asm("hlt", "");
+}
+
 ulong read_cr0()
 {
     return __asm!ulong("mov %cr0, %rax", "={rax}");
diff --git a/src/hulk/hulk.d b/src/hulk/hulk.d
index d01f861..419d828 100644
--- a/src/hulk/hulk.d
+++ b/src/hulk/hulk.d
@@ -16,6 +16,7 @@ import hulk.pci;
 import hulk.gdt;
 import hulk.idt;
 import hos.cpu;
+import ldc.llvmasm;
 
 extern extern(C) __gshared ubyte _hulk_total_size;
 
@@ -46,8 +47,10 @@ void hulk_start()
 
     hippo.initialize(&hulk_header);
     pci.initialize();
+    sti();
 
     for (;;)
     {
+        hlt();
     }
 }