From cba96c8de3d512aea665cd22123b531264630d2d Mon Sep 17 00:00:00 2001
From: Berkus Decker <berkus+github@metta.systems>
Date: Thu, 11 Mar 2021 01:57:13 +0200
Subject: [PATCH] add paging illustration

this sample pretends that each directory has only
2 table entries.
---
 nucleus/src/arch/aarch64/memory/paging.puml | 40 +++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 nucleus/src/arch/aarch64/memory/paging.puml

diff --git a/nucleus/src/arch/aarch64/memory/paging.puml b/nucleus/src/arch/aarch64/memory/paging.puml
new file mode 100644
index 0000000..de1ca8e
--- /dev/null
+++ b/nucleus/src/arch/aarch64/memory/paging.puml
@@ -0,0 +1,40 @@
+@startuml
+'https://plantuml.com/object-diagram
+
+object GiantPage
+object GiantPage_2
+object LargePage
+object Page
+object Page_2
+object Unmapped
+
+map L1PageUpperDirectory_2 {
+  entry0 *--> GiantPage_2
+  entry1 *--> Unmapped
+}
+
+map L3PageTable {
+  entry0 *--> Page
+  entry1 *--> Page_2
+}
+
+map L2PageDirectory {
+  entry0 *-> L3PageTable
+  entry1 *--> LargePage
+}
+
+map L1PageUpperDirectory {
+  entry0 *-> L2PageDirectory
+  entry1 *--> GiantPage
+}
+
+map L0PageGlobalDirectory {
+  entry0 *-> L1PageUpperDirectory
+  entry1 *--> L1PageUpperDirectory_2
+}
+
+map VirtSpace {
+  root *-> L0PageGlobalDirectory
+}
+
+@enduml