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diff --git a/dev/pitreg.h b/dev/pitreg.h
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+/*
+ * Copyright (c) 2001-2005 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* @file
+ * Device register definitions for a device's PCI config space
+ */
+
+#ifndef __PITREG_H__
+#define __PITREG_H__
+
+#include <sys/types.h>
+
+// Control Word Format
+
+#define PIT_SEL_SHFT  0x6
+#define PIT_RW_SHFT   0x4
+#define PIT_MODE_SHFT 0x1
+#define PIT_BCD_SHFT  0x0
+
+#define PIT_SEL_MASK  0x3
+#define PIT_RW_MASK   0x3
+#define PIT_MODE_MASK 0x7
+#define PIT_BCD_MASK  0x1
+
+#define GET_CTRL_FIELD(x, s, m) (((x) >> s) & m)
+#define GET_CTRL_SEL(x) GET_CTRL_FIELD(x, PIT_SEL_SHFT, PIT_SEL_MASK)
+#define GET_CTRL_RW(x) GET_CTRL_FIELD(x, PIT_RW_SHFT, PIT_RW_MASK)
+#define GET_CTRL_MODE(x) GET_CTRL_FIELD(x, PIT_MODE_SHFT, PIT_MODE_MASK)
+#define GET_CTRL_BCD(x) GET_CTRL_FIELD(x, PIT_BCD_SHFT, PIT_BCD_MASK)
+
+#define PIT_READ_BACK 0x3
+
+#define PIT_RW_LATCH_COMMAND 0x0
+#define PIT_RW_LSB_ONLY      0x1
+#define PIT_RW_MSB_ONLY      0x2
+#define PIT_RW_16BIT         0x3
+
+#define PIT_MODE_INTTC    0x0
+#define PIT_MODE_ONESHOT  0x1
+#define PIT_MODE_RATEGEN  0x2
+#define PIT_MODE_SQWAVE   0x3
+#define PIT_MODE_SWSTROBE 0x4
+#define PIT_MODE_HWSTROBE 0x5
+
+#define PIT_BCD_FALSE 0x0
+#define PIT_BCD_TRUE  0x1
+
+#endif // __PITREG_H__