1 files changed, 69 insertions, 0 deletions
diff --git a/lib/libarch/alpha/alpha_mmclock_init.c b/lib/libarch/alpha/alpha_mmclock_init.c
new file mode 100644
index 00000000000..3b807f7e23c
--- /dev/null
+++ b/lib/libarch/alpha/alpha_mmclock_init.c
@@ -0,0 +1,69 @@
+/*	$OpenBSD: alpha_mmclock_init.c,v 1.3 1996/07/30 06:46:49 niklas Exp $	*/
+/*	$NetBSD: alpha_mmclock_init.c,v 1.1 1995/12/20 12:55:21 cgd Exp $	*/
+
+/*
+ * Copyright (c) 1995 Carnegie-Mellon University.
+ * All rights reserved.
+ *
+ * Author: Chris G. Demetriou
+ *
+ * Permission to use, copy, modify and distribute this software and
+ * its documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ *
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
+ * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * Carnegie Mellon requests users of this software to return to
+ *
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ *
+ * any improvements or extensions that they make and grant Carnegie the
+ * rights to redistribute these changes.
+ */
+
+#include <sys/types.h>
+#include <sys/fcntl.h>
+#include <sys/mman.h>
+#include <machine/sysarch.h>
+
+#include "libalpha.h"
+
+volatile struct alpha_timedata *alpha_mmclockdata;
+u_long alpha_cycles_per_second;
+
+int __alpha_mmclock_init_failed;
+
+volatile struct alpha_timedata *
+alpha_mmclock_init()
+{
+	int fd;
+
+	if (alpha_mmclockdata != NULL)
+		return (alpha_mmclockdata);
+
+	fd = open("/dev/mmclock", O_RDONLY, 0);
+	if (fd == -1)
+		goto fail;
+
+	alpha_mmclockdata = (struct alpha_timedata *)
+	    mmap(NULL, getpagesize(), PROT_READ, MAP_FILE, fd, 0);
+	close(fd);
+	if (alpha_mmclockdata == NULL)
+		goto fail;
+
+	alpha_cycles_per_second = alpha_mmclockdata->td_cpc;
+
+	__alpha_mmclock_init_failed = 0;
+	return (alpha_mmclockdata);
+
+fail:
+	__alpha_mmclock_init_failed = 1;
+	return (NULL);
+}