From 747c2a4e17100f9ce80643bbc72d2e247da04f94 Mon Sep 17 00:00:00 2001
From: Drew Galbraith <dgalbraith33@gmail.com>
Date: Thu, 18 May 2023 10:43:45 -0700
Subject: [PATCH] Add a page fault handler

---
 zion/interrupt/interrupt.cpp     | 4 ++++
 zion/interrupt/interrupt_enter.s | 1 +
 2 files changed, 5 insertions(+)

diff --git a/zion/interrupt/interrupt.cpp b/zion/interrupt/interrupt.cpp
index 06cc771..042721d 100644
--- a/zion/interrupt/interrupt.cpp
+++ b/zion/interrupt/interrupt.cpp
@@ -44,9 +44,13 @@ extern "C" void interrupt_divide_by_zero(void* frame) { panic("DIV0"); }
 extern "C" void isr_protection_fault();
 extern "C" void interrupt_protection_fault(void* frame) { panic("GP"); }
 
+extern "C" void isr_page_fault();
+extern "C" void interrupt_page_fault(void* frame) { panic("PF"); }
+
 void InitIdt() {
   gIdt[0] = CreateDescriptor(isr_divide_by_zero);
   gIdt[13] = CreateDescriptor(isr_protection_fault);
+  gIdt[14] = CreateDescriptor(isr_page_fault);
   InterruptDescriptorTablePointer idtp{
       .size = sizeof(gIdt),
       .base = reinterpret_cast<uint64_t>(gIdt),
diff --git a/zion/interrupt/interrupt_enter.s b/zion/interrupt/interrupt_enter.s
index f2563e4..92b41a6 100644
--- a/zion/interrupt/interrupt_enter.s
+++ b/zion/interrupt/interrupt_enter.s
@@ -54,3 +54,4 @@ isr_\name:
 
 isr_handler divide_by_zero
 isr_handler protection_fault,1
+isr_handler page_fault,1