From 1799e1ba1b825eda639141b0597a1783576b69da Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Thu, 15 Jan 2026 15:46:54 +0100
Subject: x86_64/debug: implement debug port detection

---
 arch/x86_64/src/debug/qemu_output.cpp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

(limited to 'arch/x86_64/src/debug')

diff --git a/arch/x86_64/src/debug/qemu_output.cpp b/arch/x86_64/src/debug/qemu_output.cpp
index 773306f..0af5bdc 100644
--- a/arch/x86_64/src/debug/qemu_output.cpp
+++ b/arch/x86_64/src/debug/qemu_output.cpp
@@ -2,6 +2,7 @@
 
 #include "kapi/cio.hpp"
 
+#include <algorithm>
 #include <string_view>
 
 namespace teachos::debug::x86_64
@@ -9,15 +10,15 @@ namespace teachos::debug::x86_64
 
   qemu_output::qemu_output(output_device & lower)
       : m_lower{lower}
+      , m_present{port::read() == port::address}
   {}
 
   auto qemu_output::write(cio::output_stream stream, std::string_view text) -> void
   {
-    for (auto c : text)
+    if (m_present)
     {
-      dbg::write(c);
+      std::ranges::for_each(text, port::write<port::value_type>);
     }
-
     m_lower.write(stream, text);
   }
 
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