first steps towards (optional) serial mouse support

1 files changed, 21 insertions, 0 deletions

diff --git a/bda.h b/bda.h
index 29b842a..c479182 100644
--- a/bda.h
+++ b/bda.h
@@ -1,3 +1,22 @@
+/*
+ * VBMouse - BIOS data area access routines
+ * Copyright (C) 2022 Javier S. Pedro
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
 #ifndef BDA_H
 #define BDA_H
 
@@ -22,6 +41,8 @@ static inline uint8_t bda_get_byte(unsigned int offset) {
 
 #define bda_get_ebda_segment()    bda_get_word(0x0e)
 
+#define bda_get_equipment()       bda_get_word(0x10)
+
 #define bda_get_video_mode()      bda_get_byte(0x49)
 #define bda_get_num_columns()     bda_get_word(0x4a)
 #define bda_get_video_page_size() bda_get_word(0x4c)