From 2a984a93ec25e7633dbbe9945ccf45a9f0ece2fd Mon Sep 17 00:00:00 2001
From: Drew Galbraith <dgalbraith33@gmail.com>
Date: Tue, 21 Nov 2023 15:17:32 -0800
Subject: [PATCH] [Zion] Add a shim Floating Point Exception handler.

---
 zion/interrupt/interrupt.cpp     | 10 ++++++++--
 zion/interrupt/interrupt_enter.s |  1 +
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/zion/interrupt/interrupt.cpp b/zion/interrupt/interrupt.cpp
index b67f26e..9022b89 100644
--- a/zion/interrupt/interrupt.cpp
+++ b/zion/interrupt/interrupt.cpp
@@ -130,6 +130,11 @@ extern "C" void interrupt_page_fault(InterruptFrame* frame) {
   panic("PF");
 }
 
+extern "C" void isr_fpe_fault();
+extern "C" void interrupt_fpe_fault(InterruptFrame* frame) {
+  panic("Floating point exception");
+}
+
 extern "C" void isr_timer();
 extern "C" void interrupt_timer(InterruptFrame*) {
   gApicTimer->Calibrate();
@@ -178,8 +183,9 @@ extern "C" void interrupt_pci4(InterruptFrame*) {
 
 void InitIdt() {
   gIdt[0] = CreateDescriptor(isr_divide_by_zero);
-  gIdt[13] = CreateDescriptor(isr_protection_fault);
-  gIdt[14] = CreateDescriptor(isr_page_fault);
+  gIdt[0xD] = CreateDescriptor(isr_protection_fault);
+  gIdt[0xE] = CreateDescriptor(isr_page_fault);
+  gIdt[0x13] = CreateDescriptor(isr_fpe_fault);
 
   gIdt[0x20] = CreateDescriptor(isr_timer);
   gIdt[0x21] = CreateDescriptor(isr_apic_timer);
diff --git a/zion/interrupt/interrupt_enter.s b/zion/interrupt/interrupt_enter.s
index cd425dc..9acbe64 100644
--- a/zion/interrupt/interrupt_enter.s
+++ b/zion/interrupt/interrupt_enter.s
@@ -58,6 +58,7 @@ isr_\name:
 isr_handler divide_by_zero
 isr_handler protection_fault,1
 isr_handler page_fault,1
+isr_handler fpe_fault
 
 isr_handler timer
 isr_handler apic_timer