From 1b0344660de2832b472b0a413c50ff7f111a9293 Mon Sep 17 00:00:00 2001
From: Javier <dev.git@javispedro.com>
Date: Sun, 30 Aug 2026 02:21:09 +0200
Subject: first steps towards (optional) serial mouse support

---
 int15ps2.h | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'int15ps2.h')

diff --git a/int15ps2.h b/int15ps2.h
index db1b878..04d5a8d 100644
--- a/int15ps2.h
+++ b/int15ps2.h
@@ -23,6 +23,7 @@
 #include <stdbool.h>
 #include <stdint.h>
 #include "utils.h"
+#include "bda.h"
 
 /** Standard PS/2 mouse IRQ. At least on VirtualBox. */
 #define PS2_MOUSE_IRQ        12
@@ -95,6 +96,12 @@ enum ps2m_sample_rate {
 /** Invoked by the BIOS when there is a mouse event. */
 typedef void (__far * LPFN_PS2CALLBACK)();
 
+static bool ps2m_installed()
+{
+	uint16_t equipment = bda_get_equipment();
+	return equipment & (1 << 2);
+}
+
 static ps2m_err ps2m_init(uint8_t packet_size);
 #pragma aux ps2m_init = \
 	"stc"               /* If nothing happens, assume failure */ \
-- 
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