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diff --git a/kernel/drivers/char/snsc.h b/kernel/drivers/char/snsc.h
new file mode 100644
index 000000000..e8c52c882
--- /dev/null
+++ b/kernel/drivers/char/snsc.h
@@ -0,0 +1,92 @@
+/*
+ * SN Platform system controller communication support
+ *
+ * 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.
+ *
+ * Copyright (C) 2004-2006 Silicon Graphics, Inc. All rights reserved.
+ */
+
+/*
+ * This file contains macros and data types for communication with the
+ * system controllers in SGI SN systems.
+ */
+
+#ifndef _SN_SYSCTL_H_
+#define _SN_SYSCTL_H_
+
+#include <linux/types.h>
+#include <linux/spinlock.h>
+#include <linux/wait.h>
+#include <linux/fs.h>
+#include <linux/cdev.h>
+#include <linux/semaphore.h>
+#include <asm/sn/types.h>
+
+#define CHUNKSIZE 127
+
+/* This structure is used to track an open subchannel. */
+struct subch_data_s {
+	nasid_t sd_nasid;	/* node on which the subchannel was opened */
+	int sd_subch;		/* subchannel number */
+	spinlock_t sd_rlock;	/* monitor lock for rsv */
+	spinlock_t sd_wlock;	/* monitor lock for wsv */
+	wait_queue_head_t sd_rq;	/* wait queue for readers */
+	wait_queue_head_t sd_wq;	/* wait queue for writers */
+	struct semaphore sd_rbs;	/* semaphore for read buffer */
+	struct semaphore sd_wbs;	/* semaphore for write buffer */
+
+	char sd_rb[CHUNKSIZE];	/* read buffer */
+	char sd_wb[CHUNKSIZE];	/* write buffer */
+};
+
+struct sysctl_data_s {
+	struct cdev scd_cdev;	/* Character device info */
+	nasid_t scd_nasid;	/* Node on which subchannels are opened. */
+};
+
+
+/* argument types */
+#define IR_ARG_INT              0x00    /* 4-byte integer (big-endian)  */
+#define IR_ARG_ASCII            0x01    /* null-terminated ASCII string */
+#define IR_ARG_UNKNOWN          0x80    /* unknown data type.  The low
+                                         * 7 bits will contain the data
+                                         * length.                      */
+#define IR_ARG_UNKNOWN_LENGTH_MASK	0x7f
+
+
+/* system controller event codes */
+#define EV_CLASS_MASK		0xf000ul
+#define EV_SEVERITY_MASK	0x0f00ul
+#define EV_COMPONENT_MASK	0x00fful
+
+#define EV_CLASS_POWER		0x1000ul
+#define EV_CLASS_FAN		0x2000ul
+#define EV_CLASS_TEMP		0x3000ul
+#define EV_CLASS_ENV		0x4000ul
+#define EV_CLASS_TEST_FAULT	0x5000ul
+#define EV_CLASS_TEST_WARNING	0x6000ul
+#define EV_CLASS_PWRD_NOTIFY	0x8000ul
+
+/* ENV class codes */
+#define ENV_PWRDN_PEND		0x4101ul
+
+#define EV_SEVERITY_POWER_STABLE	0x0000ul
+#define EV_SEVERITY_POWER_LOW_WARNING	0x0100ul
+#define EV_SEVERITY_POWER_HIGH_WARNING	0x0200ul
+#define EV_SEVERITY_POWER_HIGH_FAULT	0x0300ul
+#define EV_SEVERITY_POWER_LOW_FAULT	0x0400ul
+
+#define EV_SEVERITY_FAN_STABLE		0x0000ul
+#define EV_SEVERITY_FAN_WARNING		0x0100ul
+#define EV_SEVERITY_FAN_FAULT		0x0200ul
+
+#define EV_SEVERITY_TEMP_STABLE		0x0000ul
+#define EV_SEVERITY_TEMP_ADVISORY	0x0100ul
+#define EV_SEVERITY_TEMP_CRITICAL	0x0200ul
+#define EV_SEVERITY_TEMP_FAULT		0x0300ul
+
+void scdrv_event_init(struct sysctl_data_s *);
+
+#endif /* _SN_SYSCTL_H_ */