Initial commit
diff --git a/src/descriptor_tables.h b/src/descriptor_tables.h
new file mode 100644
index 0000000..d918f4a
--- /dev/null
+++ b/src/descriptor_tables.h
@@ -0,0 +1,114 @@
+#pragma once
+
+#include "kint.h"
+
+struct gdt_entry
+{
+ ushort limit_low;
+ ushort base_low;
+ uchar base_middle;
+
+ union
+ {
+ struct
+ {
+ uint a_p : 1;
+ uint a_dpl : 2;
+ uint a_dt : 1;
+ uint a_type : 4;
+ };
+
+ uchar access;
+ };
+
+ union
+ {
+ struct
+ {
+ uint g_g : 1;
+ uint g_d : 1;
+ uint g_zero : 2; /* includes A */
+ uint g_len : 4;
+ };
+
+ uchar granularity;
+ };
+
+ uchar base_high;
+} __attribute__((packed));
+
+
+struct gdt_pointer
+{
+ /* Upper 16 bits of selector limits */
+ ushort limit;
+ /* first struct gdt_entry */
+ uint base;
+} __attribute__((packed));
+
+struct idt_entry
+{
+ ushort base_low;
+ ushort selector;
+ uchar zero;
+
+ union
+ {
+ struct
+ {
+ uchar f_p : 1;
+ uchar f_dpl : 2;
+ uchar f_const : 5;
+ };
+
+ uchar flags;
+ };
+
+ ushort base_high;
+} __attribute__((packed));
+
+#define IDT_F_CONST 0b00110
+
+struct idt_pointer
+{
+ ushort limit;
+ uint base;
+} __attribute__((packed));
+
+extern void isr0();
+extern void isr1();
+extern void isr2();
+extern void isr3();
+extern void isr4();
+extern void isr5();
+extern void isr6();
+extern void isr7();
+extern void isr8();
+extern void isr9();
+extern void isr10();
+extern void isr11();
+extern void isr12();
+extern void isr13();
+extern void isr14();
+extern void isr15();
+extern void isr16();
+extern void isr17();
+extern void isr18();
+extern void isr19();
+extern void isr20();
+extern void isr21();
+extern void isr22();
+extern void isr23();
+extern void isr24();
+extern void isr25();
+extern void isr26();
+extern void isr27();
+extern void isr28();
+extern void isr29();
+extern void isr30();
+extern void isr31();
+
+
+void init_descriptor_tables();
+void init_idt();
+void init_gdt();