From a9d39fdb56526c4146d92e6af68cc175ec4da7c2 Mon Sep 17 00:00:00 2001
From: Dennis Kobert <dennis@kobert.dev>
Date: Thu, 7 Nov 2019 18:32:47 +0100
Subject: Add interupt descriptor table

---
 kernel/Cargo.toml                   |  4 ++++
 kernel/src/boot.asm                 |  2 +-
 kernel/src/interrupts/exceptions.rs |  7 +++++++
 kernel/src/interrupts/mod.rs        |  2 ++
 kernel/src/interrupts/table.rs      | 16 ++++++++++++++++
 kernel/src/lib.rs                   |  6 ++++--
 6 files changed, 34 insertions(+), 3 deletions(-)
 create mode 100644 kernel/src/interrupts/exceptions.rs
 create mode 100644 kernel/src/interrupts/mod.rs
 create mode 100644 kernel/src/interrupts/table.rs

(limited to 'kernel')

diff --git a/kernel/Cargo.toml b/kernel/Cargo.toml
index 660cb80..9ac2848 100644
--- a/kernel/Cargo.toml
+++ b/kernel/Cargo.toml
@@ -16,6 +16,10 @@ x86_64 = "0.7.5"
 uart_16550 = "0.2.1"
 spin = "0.5"
 
+[dependencies.lazy_static]
+version = "1.4.0"
+features = ["spin_no_std"]
+
 [dependencies.compiler_builtins]
 version = "0.1.19"
 git = "https://github.com/rust-lang/compiler-builtins"
diff --git a/kernel/src/boot.asm b/kernel/src/boot.asm
index 451e455..95b699a 100644
--- a/kernel/src/boot.asm
+++ b/kernel/src/boot.asm
@@ -160,5 +160,5 @@ p3_table:
 p2_table:
 	resb 4096
 stack_bottom:
-	resb 4096
+	resb 4096 * 8
 stack_top:
diff --git a/kernel/src/interrupts/exceptions.rs b/kernel/src/interrupts/exceptions.rs
new file mode 100644
index 0000000..5ec7588
--- /dev/null
+++ b/kernel/src/interrupts/exceptions.rs
@@ -0,0 +1,7 @@
+use crate::io::vga_text::OStream;
+use x86_64::structures::idt::InterruptStackFrame;
+
+pub extern "x86-interrupt" fn breakpoint_handler(stack_frame: &mut InterruptStackFrame) {
+    let mut stdout = OStream::new();
+    stdout.print(b"EXCEPTION: BREAKPOINT\n");
+}
diff --git a/kernel/src/interrupts/mod.rs b/kernel/src/interrupts/mod.rs
new file mode 100644
index 0000000..ae21761
--- /dev/null
+++ b/kernel/src/interrupts/mod.rs
@@ -0,0 +1,2 @@
+mod exceptions;
+pub mod table;
diff --git a/kernel/src/interrupts/table.rs b/kernel/src/interrupts/table.rs
new file mode 100644
index 0000000..47d6ead
--- /dev/null
+++ b/kernel/src/interrupts/table.rs
@@ -0,0 +1,16 @@
+use crate::io::vga_text::OStream;
+use lazy_static::lazy_static;
+use x86_64::structures::idt::InterruptDescriptorTable;
+
+lazy_static! {
+    static ref IDT: InterruptDescriptorTable = {
+        let mut idt = InterruptDescriptorTable::new();
+        idt.breakpoint
+            .set_handler_fn(super::exceptions::breakpoint_handler);
+        idt
+    };
+}
+
+pub fn init() {
+    IDT.load()
+}
diff --git a/kernel/src/lib.rs b/kernel/src/lib.rs
index d5a3e9e..45ba8e1 100644
--- a/kernel/src/lib.rs
+++ b/kernel/src/lib.rs
@@ -1,12 +1,12 @@
 #![no_main]
 #![feature(compiler_builtins_lib)]
 #![feature(custom_test_frameworks)]
+#![feature(abi_x86_interrupt)]
 #![test_runner(crate::test_runner)]
 #![reexport_test_harness_main = "test_main"]
 #![no_std]
 
-extern crate compiler_builtins;
-
+mod interrupts;
 mod io;
 
 use core::fmt::Write;
@@ -25,6 +25,7 @@ pub fn test_runner(tests: &[&dyn Fn(&mut OStream)]) {
 
 #[no_mangle]
 pub extern "C" fn _start() -> ! {
+    interrupts::table::init();
     if cfg!(test) {
         #[cfg(test)]
         test_main();
@@ -71,5 +72,6 @@ pub extern "C" fn panic_handler(_info: &core::panic::PanicInfo) -> ! {
         write!(serial::SerialStream::new(), "Testing failed\n").unwrap();
         qemu::exit_qemu(qemu::QemuExitCode::Failed);
     }
+    x86_64::instructions::interrupts::int3();
     loop {}
 }
-- 
cgit v1.2.3-54-g00ecf