Clean: harmonizing & header-commenting code

src/kernel/gdt.h

@@ -1,8 +1,28 @@
+// Global descriptor table setup header
+// Author: xamidev
+// Licensed under the Unlicense. See the repo below.
+// https//github.com/xamidev/blankos
+
 #ifndef GDT_H
 #define GDT_H
 
-void gdt_set_gate(int num, unsigned long base, unsigned long limit, unsigned char access, unsigned char gran);
+struct gdt_entry
+{
+	unsigned short limit_low;
+	unsigned short base_low;
+	unsigned char base_middle;
+	unsigned char access;
+	unsigned char granularity;
+	unsigned char base_high;
+} __attribute__((packed));
 
+struct gdt_ptr
+{
+	unsigned short limit;
+	unsigned int base;
+} __attribute__((packed));
+
+void gdt_set_gate(int num, unsigned long base, unsigned long limit, unsigned char access, unsigned char gran);
 void gdt_install();
 
 #endif