From 5e9190ff1a7d35e812b42c5bb9cbb742c2d313fb Mon Sep 17 00:00:00 2001
From: Tianhao Wang <wth@riseup.net>
Date: Mon, 5 Feb 2024 14:04:25 +0100
Subject: MM: add modules for memory management

---
 src/arch/x86_64/mem.rs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 src/arch/x86_64/mem.rs

(limited to 'src/arch/x86_64/mem.rs')

diff --git a/src/arch/x86_64/mem.rs b/src/arch/x86_64/mem.rs
new file mode 100644
index 0000000..52ccdec
--- /dev/null
+++ b/src/arch/x86_64/mem.rs
@@ -0,0 +1,16 @@
+// to detect available memory to initialize PMA
+// https://wiki.osdev.org/Detecting_Memory_(x86)
+use core::arch::asm;
+use crate::io::*;
+
+extern "C" {
+	fn do_e820(start: usize) -> u32;
+}
+
+// Getting an E820 Memory Map -- osdev wiki
+pub fn prob_mem_bios(){
+	unsafe {
+		let res = do_e820(0x8000);
+		println!("res is {}", res)
+	}
+}
-- 
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