Added and matched all source-available files, updated headers to 2.0L (#16)

include/PR/os_system.h

@@ -1,3 +1,32 @@
+
+/*====================================================================
+ * os_system.h
+ *
+ * Copyright 1995, Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This is UNPUBLISHED PROPRIETARY SOURCE CODE of Silicon Graphics,
+ * Inc.; the contents of this file may not be disclosed to third
+ * parties, copied or duplicated in any form, in whole or in part,
+ * without the prior written permission of Silicon Graphics, Inc.
+ *
+ * RESTRICTED RIGHTS LEGEND:
+ * Use, duplication or disclosure by the Government is subject to
+ * restrictions as set forth in subdivision (c)(1)(ii) of the Rights
+ * in Technical Data and Computer Software clause at DFARS
+ * 252.227-7013, and/or in similar or successor clauses in the FAR,
+ * DOD or NASA FAR Supplement. Unpublished - rights reserved under the
+ * Copyright Laws of the United States.
+ *====================================================================*/
+
+/*---------------------------------------------------------------------*
+        Copyright (C) 1998 Nintendo. (Originated by SGI)
+        
+        $RCSfile: os_system.h,v $
+        $Revision: 1.1 $
+        $Date: 1998/10/09 08:01:18 $
+ *---------------------------------------------------------------------*/
+
 #ifndef _OS_SYSTEM_H_
 #define _OS_SYSTEM_H_
 
@@ -31,7 +60,14 @@ extern s32   osVersion;
 extern u32   osMemSize;     /* Memory Size */
 extern s32   osAppNMIBuffer[OS_APP_NMI_BUFSIZE/sizeof(s32)];
 
-extern u64  osClockRate;
+/*
+ * CPU counter increments at 3/4 of bus clock rate:
+ *
+ * Bus Clock	Proc Clock	Counter (1/2 Proc Clock)
+ * ---------	----------	------------------------
+ * 62.5 Mhz	93.75 Mhz	46.875 Mhz
+ */
+extern u64 osClockRate;
 
 extern OSIntMask __OSGlobalIntMask; /* global interrupt mask */