From fb315be37b28f64ad07aaa348f5ab31552c33c76 Mon Sep 17 00:00:00 2001
From: Philipp Oppermann <dev@phil-opp.com>
Date: Tue, 6 Apr 2021 17:41:57 +0200
Subject: [PATCH] Query RSDP address

---
 src/main.rs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index 2e1e01cf..0b4dec4f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -7,7 +7,7 @@ extern crate alloc;
 
 use alloc::vec::Vec;
 use core::{alloc::Layout, fmt::Write, panic::PanicInfo};
-use uefi::prelude::entry;
+use uefi::{prelude::entry, table::cfg};
 
 #[entry]
 fn efi_main(
@@ -28,6 +28,12 @@ fn efi_main(
     v.push(2);
     writeln!(stdout, "v = {:?}", v).unwrap();
 
+    let mut config_entries = system_table.config_table().iter();
+    let rsdp_addr = config_entries
+        .find(|entry| matches!(entry.guid, cfg::ACPI_GUID | cfg::ACPI2_GUID))
+        .map(|entry| entry.address);
+    writeln!(stdout, "rsdp addr: {:?}", rsdp_addr).unwrap();
+
     loop {}
 }