From d12160c5d070ee0819054a9a515ac0a75b2bc6ac Mon Sep 17 00:00:00 2001
From: zxq5 <zxq5@zxq5.dev>
Date: Sat, 22 Feb 2025 03:16:13 +0000
Subject: [PATCH] setup TSS

---
 kernel/src/arch/x86_64/gdt.rs | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 kernel/src/arch/x86_64/gdt.rs

diff --git a/kernel/src/arch/x86_64/gdt.rs b/kernel/src/arch/x86_64/gdt.rs
new file mode 100644
index 0000000..bf4c036
--- /dev/null
+++ b/kernel/src/arch/x86_64/gdt.rs
@@ -0,0 +1,18 @@
+use x86_64::{structures::tss::TaskStateSegment, VirtAddr};
+
+use spin::Lazy;
+
+pub const DOUBLE_FAULT_1ST_INDEX: u16 = 0;
+
+static TSS: Lazy<TaskStateSegment> = Lazy::new(|| {
+    let mut tss = TaskStateSegment::new();
+    tss.interrupt_stack_table[DOUBLE_FAULT_1ST_INDEX as usize] = {
+        const STACK_SIZE: usize = 4096 * 8;
+        static mut STACK: [u8; STACK_SIZE] = [0; STACK_SIZE];
+
+        let stack_start = VirtAddr::from_ptr(&raw const STACK);
+        let stack_end = stack_start + STACK_SIZE.try_into().unwrap();
+        stack_end
+    };
+    tss
+});