enter unreal mode

resources.md

@@ -11,9 +11,12 @@
 ## Boot sequence
 - <https://wiki.osdev.org/Boot_Sequence>
 - <https://wiki.osdev.org/Protected_Mode#Entering_Protected_Mode>
-- <https://wiki.osdev.org/Unreal_Mode>
 - <https://wiki.osdev.org/A20_Line>
 
+## Unreal mode
+- <https://wiki.osdev.org/Unreal_Mode>
+- <http://www.rcollins.org/ddj/Aug98/Aug98.html>
+
 ## Memory
 - <https://wiki.osdev.org/Memory_Map_(x86)>
 - <https://wiki.osdev.org/Detecting_Memory_(x86)>
@@ -44,3 +47,9 @@
 
 ## Partitioning
 - <https://wiki.osdev.org/GPT>
+
+## Memory protection
+- <https://wiki.osdev.org/Global_Descriptor_Table>
+- <https://wiki.osdev.org/GDT_Tutorial>
+- <https://wiki.osdev.org/Segment_Limits>
+- <https://www.felixcloutier.com/x86/lgdt:lidt>