diff --git a/include/ac97.h b/include/ac97.h
new file mode 100644
index 00000000..18d68201
--- /dev/null
+++ b/include/ac97.h
@@ -0,0 +1,72 @@
+/*
+ * $Id$
+ *
+ * AC97 Registers
+ * Copyright (C) 2002 ETC s.r.o.
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ *
+ * Written by Marcel Telka <marcel@telka.sk>, 2002.
+ *
+ * Documentation:
+ * [1] Intel Corporation, "AC'97 Component Specification Revision 2.3
+ *     Rev 1.0", April 2002
+ *
+ */
+
+#ifndef	AC97_H
+#define	AC97_H
+
+/* Baseline Audio Register Set - see 5.7 in [1] */
+
+#define	AC97_Reset			0x00
+#define	AC97_Master_Volume		0x02
+#define	AC97_Aux_Out_Volume		0x04
+#define	AC97_Mono_Volume		0x06
+#define	AC97_Master_Tone		0x08
+#define	AC97_PC_Beep_Volume		0x0A
+#define	AC97_Phone_Volume		0x0C
+#define	AC97_Mic_Volume			0x0E
+#define	AC97_Line_In_Volume		0x10
+#define	AC97_CD_Volume			0x12
+#define	AC97_Video_Volume		0x14
+#define	AC97_Aux_In_Volume		0x16
+#define	AC97_PCM_Out_Volume		0x18
+#define	AC97_Record_Select		0x1A
+#define	AC97_Record_Gain		0x1C
+#define	AC97_Record_Gain_Mic		0x1E
+#define	AC97_General_Purpose		0x20
+#define	AC97_3D_Control			0x22
+#define	AC97_Audio_Int_and_Paging	0x24
+#define	AC97_Powerdown_Ctrl_Stat	0x26
+
+/* Extended Audio Register Set - see 5.8 in [1] */
+
+#define	AC97_Extended_Audio_ID		0x28
+#define	AC97_Extended_Audio_Stat_Ctrl	0x2A
+#define	AC97_PCM_Front_DAC_Rate		0x2C
+#define	AC97_PCM_Surr_DAC_Rate		0x2E
+#define	AC97_PCM_LFE_DAC_Rate		0x30
+#define	AC97_PCM_L_R_ADC_Rate		0x32
+#define	AC97_Mic_ADC_Rate		0x34
+#define	AC97_Center_LFE_Volume		0x36
+#define	AC97_Surround_Volume		0x38
+#define	AC97_S_PDIF_Control		0x3A
+
+#define	AC97_Vendor_ID1			0x7C
+#define	AC97_Vendor_ID2			0x7E
+
+#endif /* AC97_H */