From 27293c805c35b7497b5e23e747b56d39aae9703d Mon Sep 17 00:00:00 2001
From: Mathieu Maret <mathieu.maret@gmail.com>
Date: Fri, 16 Nov 2018 15:00:31 +0100
Subject: [PATCH] Add more info about segfault

---
 core/exception_handler.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/core/exception_handler.c b/core/exception_handler.c
index 64aeca0..a948fba 100644
--- a/core/exception_handler.c
+++ b/core/exception_handler.c
@@ -11,6 +11,11 @@ __attribute__((interrupt)) void print_handler(struct interrupt_frame *frame, ulo
         (void)error_code;
 }
 
+
+// c.f. https://wiki.osdev.org/Paging#Handling
+// error_code   bit0: Present ?
+//              bit1: Trying to write ?
+//              bit2: User page try to access?
 __attribute__((interrupt)) void pagefault_handler(struct interrupt_frame *frame, ulong error_code){
         printStringDetails("PAGE FAULT", RED, BLACK, 0, VGA_HEIGHT - 1);
         printIntDetails(error_code, RED, BLACK, 11, VGA_HEIGHT - 1);