From 8cc70a6a1a1ced22ff4948cfe678bc2c7ec7ec10 Mon Sep 17 00:00:00 2001
From: ami-chuu <amichuu73@proton.me>
Date: Tue, 31 Mar 2026 00:14:07 +0300
Subject: [PATCH] Print PhysAddr

---
 src/interrupts.rs | 18 ++++++++++++++++--
 src/main.rs       |  8 ++++++++
 src/vga_buffer.rs |  2 +-
 3 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/src/interrupts.rs b/src/interrupts.rs
index b9e1ba9..5348439 100644
--- a/src/interrupts.rs
+++ b/src/interrupts.rs
@@ -1,8 +1,8 @@
-use crate::{gdt, print, println};
+use crate::{gdt, hlt_loop, print, println};
 use lazy_static::lazy_static;
 use pic8259::ChainedPics;
 use spin;
-use x86_64::structures::idt::{InterruptDescriptorTable, InterruptStackFrame};
+use x86_64::structures::idt::{InterruptDescriptorTable, InterruptStackFrame, PageFaultErrorCode};
 
 #[derive(Debug, Clone, Copy)]
 #[repr(u8)]
@@ -22,6 +22,7 @@ lazy_static! {
         }
         idt[InterruptIndex::Timer.as_usize()].set_handler_fn(timer_interrupt_handler);
         idt[InterruptIndex::Keyboard.as_usize()].set_handler_fn(keyboard_interrupt_handler);
+        idt.page_fault.set_handler_fn(page_fault_handler);
 
         idt
     };
@@ -91,6 +92,19 @@ extern "x86-interrupt" fn keyboard_interrupt_handler(_stack_frame: InterruptStac
     }
 }
 
+extern "x86-interrupt" fn page_fault_handler(
+    stack_frame: InterruptStackFrame,
+    error_code: PageFaultErrorCode,
+) {
+    use x86_64::registers::control::Cr2;
+
+    println!("EXCEPTION: PAGE FAULT");
+    println!("Accessed Address: {:?}", Cr2::read());
+    println!("Error Code: {:?}", error_code);
+    println!("{:?}", stack_frame);
+    hlt_loop();
+}
+
 #[test_case]
 fn test_breakpoint_exception() {
     // invoke a breakpoint exception
diff --git a/src/main.rs b/src/main.rs
index ae33235..b5ed8fa 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -13,6 +13,14 @@ pub extern "C" fn _start() -> ! {
 
     amix::init();
 
+    use x86_64::registers::control::Cr3;
+
+    let (level_4_page_table, _) = Cr3::read();
+    println!(
+        "Level 4 page table at: {:?}",
+        level_4_page_table.start_address()
+    );
+
     #[cfg(test)]
     test_main();
 
diff --git a/src/vga_buffer.rs b/src/vga_buffer.rs
index 8f28833..4946715 100644
--- a/src/vga_buffer.rs
+++ b/src/vga_buffer.rs
@@ -129,7 +129,7 @@ impl fmt::Write for Writer {
 lazy_static! {
     pub static ref WRITER: Mutex<Writer> = Mutex::new(Writer {
         column_position: 0,
-        color_code: ColorCode::new(Color::White, Color::Black),
+        color_code: ColorCode::new(Color::LightGray, Color::Black),
         buffer: unsafe { &mut *(0xb8000 as *mut Buffer) },
     });
 }