From f231f2c7f2ee788b395aac37c90d36418ccf8b1a Mon Sep 17 00:00:00 2001
From: Philipp Oppermann <dev@phil-opp.com>
Date: Thu, 13 Apr 2017 17:52:32 +0200
Subject: [PATCH] Print available memory areas

---
 src/lib.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/lib.rs b/src/lib.rs
index 4602231..a30dd50 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -17,6 +17,16 @@ pub extern fn rust_main(multiboot_information_address: usize) {
     vga_buffer::clear_screen();
     println!("Hello World{}", "!");
 
+    let boot_info = unsafe{ multiboot2::load(multiboot_information_address) };
+    let memory_map_tag = boot_info.memory_map_tag()
+        .expect("Memory map tag required");
+
+    println!("memory areas:");
+    for area in memory_map_tag.memory_areas() {
+        println!("    start: 0x{:x}, length: 0x{:x}",
+            area.base_addr, area.length);
+    }
+
     loop{}
 }