From 132d3236bb884433bf94e961f6d32264e0334aec Mon Sep 17 00:00:00 2001
From: ornitorrincos
Date: Tue, 18 Aug 2026 12:15:05 +0200
Subject: 

---
 kernel/gdt.h | 93 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 kernel/gdt.h

(limited to 'kernel/gdt.h')

diff --git a/kernel/gdt.h b/kernel/gdt.h
new file mode 100644
index 0000000..c0ba677
--- /dev/null
+++ b/kernel/gdt.h
@@ -0,0 +1,93 @@
+#pragma once
+
+#include <stdint.h>
+
+typedef struct __attribute__((packed))
+{
+    uint16_t size;
+    uint64_t ptr;
+}  gdt_load;
+
+typedef struct __attribute__((packed))
+{
+    uint64_t limit: 16;
+    uint64_t base_low: 16;
+    uint64_t base_mid: 8;
+    uint64_t A: 1;
+    uint64_t R: 1;
+    uint64_t C: 1;
+    uint64_t one0: 1;
+    uint64_t one1: 1;
+    uint64_t DPL: 2;
+    uint64_t P: 1;
+    uint64_t limit_high: 4;
+    uint64_t AVL: 1;
+    uint64_t L: 1;
+    uint64_t D: 1;
+    uint64_t G: 1;
+    uint64_t base_high: 8;
+} code_segment;
+
+typedef struct __attribute__((packed))
+{
+    uint64_t limit: 16;
+    uint64_t base_low: 16;
+    uint64_t base_mid: 8;
+    uint64_t A: 1;
+    uint64_t W: 1;
+    uint64_t E: 1;
+    uint64_t zero: 1;
+    uint64_t one: 1;
+    uint64_t DPL: 2;
+    uint64_t P: 1;
+    uint64_t limit_high: 4;
+    uint64_t AVL: 1;
+    uint64_t L: 1;
+    uint64_t D: 1;
+    uint64_t G: 1;
+    uint64_t base_high: 8;
+} data_segment;
+
+typedef struct __attribute__((packed))
+{
+    uint64_t limit_low: 16;
+    uint64_t base_low: 24;
+    uint64_t type: 4;
+    uint64_t zero0: 1;
+    uint64_t DPL: 2;
+    uint64_t P: 1;
+    uint64_t limit_high: 4;
+    uint64_t AVL: 1;
+    uint64_t zero1: 1;
+    uint64_t zero2: 1;
+    uint64_t G: 1;
+    uint64_t base_high: 40;
+    uint64_t rsv1: 8;
+    uint64_t zero3: 5;
+    uint64_t rsv2: 19;
+} tss_segment;
+
+typedef struct __attribute__((packed))
+{
+    uint32_t rsv0;
+    uint64_t rsp0;
+    uint64_t rsp1;
+    uint64_t rsp2;
+    uint64_t rsv1;
+    uint64_t ist1;
+    uint64_t ist2;
+    uint64_t ist3;
+    uint64_t ist4;
+    uint64_t ist5;
+    uint64_t ist6;
+    uint64_t ist7;
+    uint64_t rsv2;
+    uint16_t rsv3;
+    uint16_t io_base;
+} tss;
+
+int init_gdt();
+uint64_t create_descriptor(uint32_t base, uint32_t limit, uint8_t access_byte, uint16_t flag);
+uint64_t convert_code_segment(code_segment* segment);
+uint64_t convert_data_segment(data_segment* segment);
+void create_system_segment_descriptor();
-- 
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