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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 /*	Copyright (c) 1990, 1991 UNIX System Laboratories, Inc.	*/
     22 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989, 1990 AT&T	*/
     23 /*	All Rights Reserved	*/
     24 
     25 /*
     26  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
     27  * Use is subject to license terms.
     28  */
     29 
     30 #ifndef _SYS_PIT_H
     31 #define	_SYS_PIT_H
     32 
     33 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     34 
     35 #ifdef __cplusplus
     36 extern "C" {
     37 #endif
     38 
     39 /* Definitions for 8254 Programmable Interrupt Timer ports on AT 386 */
     40 #define	PITCTR0_PORT	0x40		/* counter 0 port */
     41 #define	PITCTR1_PORT	0x41		/* counter 1 port */
     42 #define	PITCTR2_PORT	0x42		/* counter 2 port */
     43 #define	PITCTL_PORT	0x43		/* PIT control port */
     44 #define	PITAUX_PORT	0x61		/* PIT auxiliary port */
     45 #define	SANITY_CTR0	0x48		/* sanity timer counter */
     46 #define	SANITY_CTL	0x4B		/* sanity control word */
     47 #define	SANITY_CHECK	0x461		/* bit 7 set if sanity timer went off */
     48 #define	FAILSAFE_NMI	0x80		/* to test if sanity timer went off */
     49 #define	ENABLE_SANITY	0x04		/* Enables sanity clock NMI ints */
     50 #define	RESET_SANITY	0x00		/* resets sanity NMI interrupt */
     51 
     52 /* PIT Status Byte */
     53 
     54 #define	PITSTAT_OUTPUT	7		/* OUTPUT status bit */
     55 #define	PITSTAT_NULLCNT	6		/* NULL COUNT status bit */
     56 
     57 /* Definitions for 8254 commands */
     58 
     59 #define	PIT_READBACK	0xc0		/* read-back command */
     60 #define	PIT_READBACKC0	0x02		/* enable read-back for counter 0 */
     61 
     62 /* Following are used for Timer 0 */
     63 #define	PIT_C0		0x00		/* select counter 0 */
     64 #define	PIT_LOADMODE	0x30		/* load least significant byte */
     65 					/* followed by most significant byte */
     66 #define	PIT_NDIVMODE	0x04		/* divide by N counter */
     67 #define	PIT_SQUAREMODE	0x06		/* square-wave mode */
     68 #define	PIT_ENDSIGMODE	0x00		/* assert OUT at end-of-count mode */
     69 
     70 /* Used for Timer 1. Used for delay calculations in countdown mode */
     71 #define	PIT_C1		0x40		/* select counter 1 */
     72 #define	PIT_READMODE	0x30		/* read or load least significant */
     73 					/* byte followed by most significant */
     74 #define	PIT_RATEMODE	0x06		/* square-wave mode for USART */
     75 
     76 #define	PIT_C2		0x80		/* select counter 2 */
     77 
     78 #define	SANITY_NUM	0xFFFF		/* Sanity timer fires every .2 secs */
     79 /* bits used in auxiliary control port for timer 2 */
     80 #define	PITAUX_GATE2	0x01		/* aux port, PIT gate 2 input */
     81 #define	PITAUX_OUT2	0x02		/* aux port, PIT clock out 2 enable */
     82 #define	PIT_HZ		1193182		/* 8254's cycles per second */
     83 
     84 #ifdef __cplusplus
     85 }
     86 #endif
     87 
     88 #endif	/* _SYS_PIT_H */
     89