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diff --git a/include/asm-ppc/hydra.h b/include/asm-ppc/hydra.h
new file mode 100644
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+++ b/include/asm-ppc/hydra.h
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+/*
+ *  include/asm-ppc/hydra.h -- Mac I/O `Hydra' definitions
+ *
+ *  Copyright (C) 1997 Geert Uytterhoeven
+ *
+ *  This file is based on the following documentation:
+ *
+ *      Macintosh Technology in the Common Hardware Reference Platform
+ *      Apple Computer, Inc.
+ *
+ *      © Copyright 1995 Apple Computer, Inc. All rights reserved.
+ *
+ *  It's available online from http://chrp.apple.com/MacTech.pdf.
+ *  You can obtain paper copies of this book from computer bookstores or by
+ *  writing Morgan Kaufmann Publishers, Inc., 340 Pine Street, Sixth Floor, San
+ *  Francisco, CA 94104. Reference ISBN 1-55860-393-X.
+ *
+ *  This file is subject to the terms and conditions of the GNU General Public
+ *  License.  See the file COPYING in the main directory of this archive
+ *  for more details.
+ */
+
+#ifndef _ASMPPC_HYDRA_H
+#define _ASMPPC_HYDRA_H
+
+#ifdef __KERNEL__
+
+struct Hydra {
+    /* DBDMA Controller Register Space */
+    char Pad1[0x30];
+    u_int CachePD;
+    u_int IDs;
+    u_int Feature_Control;
+    char Pad2[0x7fc4];
+    /* DBDMA Channel Register Space */
+    char SCSI_DMA[0x100];
+    char Pad3[0x300];
+    char SCCA_Tx_DMA[0x100];
+    char SCCA_Rx_DMA[0x100];
+    char SCCB_Tx_DMA[0x100];
+    char SCCB_Rx_DMA[0x100];
+    char Pad4[0x7800];
+    /* Device Register Space */
+    char SCSI[0x1000];
+    char ADB[0x1000];
+    char SCC_Legacy[0x1000];
+    char SCC[0x1000];
+    char Pad9[0x2000];
+    char VIA[0x2000];
+    char Pad10[0x28000];
+    char OpenPIC[0x40000];
+};
+
+extern volatile struct Hydra *Hydra;
+
+
+    /*
+     *  Feature Control Register
+     */
+
+#define HYDRA_FC_SCC_CELL_EN    0x00000001      /* Enable SCC Clock */
+#define HYDRA_FC_SCSI_CELL_EN   0x00000002      /* Enable SCSI Clock */
+#define HYDRA_FC_SCCA_ENABLE    0x00000004      /* Enable SCC A Lines */
+#define HYDRA_FC_SCCB_ENABLE    0x00000008      /* Enable SCC B Lines */
+#define HYDRA_FC_ARB_BYPASS     0x00000010      /* Bypass Internal Arbiter */
+#define HYDRA_FC_RESET_SCC      0x00000020      /* Reset SCC */
+#define HYDRA_FC_MPIC_ENABLE    0x00000040      /* Enable OpenPIC */
+#define HYDRA_FC_SLOW_SCC_PCLK  0x00000080      /* 1=15.6672, 0=25 MHz */
+#define HYDRA_FC_MPIC_IS_MASTER 0x00000100      /* OpenPIC Master Mode */
+
+
+    /*
+     *  OpenPIC Interrupt Sources
+     */
+
+#define HYDRA_INT_SIO           0
+#define HYDRA_INT_SCSI_DMA      1
+#define HYDRA_INT_SCCA_TX_DMA   2
+#define HYDRA_INT_SCCA_RX_DMA   3
+#define HYDRA_INT_SCCB_TX_DMA   4
+#define HYDRA_INT_SCCB_RX_DMA   5
+#define HYDRA_INT_SCSI          6
+#define HYDRA_INT_SCCA          7
+#define HYDRA_INT_SCCB          8
+#define HYDRA_INT_VIA           9
+#define HYDRA_INT_ADB           10
+#define HYDRA_INT_ADB_NMI       11
+#define HYDRA_INT_EXT1          12      /* PCI IRQW */
+#define HYDRA_INT_EXT2          13      /* PCI IRQX */
+#define HYDRA_INT_EXT3          14      /* PCI IRQY */
+#define HYDRA_INT_EXT4          15      /* PCI IRQZ */
+#define HYDRA_INT_EXT5          16      /* IDE Primay/Secondary */
+#define HYDRA_INT_EXT6          17      /* IDE Secondary */
+#define HYDRA_INT_EXT7          18      /* Power Off Request */
+#define HYDRA_INT_SPARE         19
+
+extern int hydra_init(void);
+extern void macio_adb_init(void);
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASMPPC_HYDRA_H */