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 #ifdef __cplusplus 34 extern "C" { 35 #endif 36 37 /* Definitions for 8254 Programmable Interrupt Timer ports on AT 386 */ 38 #define PITCTR0_PORT 0x40 /* counter 0 port */ 39 #define PITCTR1_PORT 0x41 /* counter 1 port */ 40 #define PITCTR2_PORT 0x42 /* counter 2 port */ 41 #define PITCTL_PORT 0x43 /* PIT control port */ 42 #define PITAUX_PORT 0x61 /* PIT auxiliary port */ 43 #define SANITY_CTR0 0x48 /* sanity timer counter */ 44 #define SANITY_CTL 0x4B /* sanity control word */ 45 #define SANITY_CHECK 0x461 /* bit 7 set if sanity timer went off */ 46 #define FAILSAFE_NMI 0x80 /* to test if sanity timer went off */ 47 #define ENABLE_SANITY 0x04 /* Enables sanity clock NMI ints */ 48 #define RESET_SANITY 0x00 /* resets sanity NMI interrupt */ 49 50 /* PIT Status Byte */ 51 52 #define PITSTAT_OUTPUT 7 /* OUTPUT status bit */ 53 #define PITSTAT_NULLCNT 6 /* NULL COUNT status bit */ 54 55 /* Definitions for 8254 commands */ 56 57 #define PIT_READBACK 0xc0 /* read-back command */ 58 #define PIT_READBACKC0 0x02 /* enable read-back for counter 0 */ 59 60 /* Following are used for Timer 0 */ 61 #define PIT_C0 0x00 /* select counter 0 */ 62 #define PIT_LOADMODE 0x30 /* load least significant byte */ 63 /* followed by most significant byte */ 64 #define PIT_NDIVMODE 0x04 /* divide by N counter */ 65 #define PIT_SQUAREMODE 0x06 /* square-wave mode */ 66 #define PIT_ENDSIGMODE 0x00 /* assert OUT at end-of-count mode */ 67 68 /* Used for Timer 1. Used for delay calculations in countdown mode */ 69 #define PIT_C1 0x40 /* select counter 1 */ 70 #define PIT_READMODE 0x30 /* read or load least significant */ 71 /* byte followed by most significant */ 72 #define PIT_RATEMODE 0x06 /* square-wave mode for USART */ 73 74 #define PIT_C2 0x80 /* select counter 2 */ 75 76 #define SANITY_NUM 0xFFFF /* Sanity timer fires every .2 secs */ 77 /* bits used in auxiliary control port for timer 2 */ 78 #define PITAUX_GATE2 0x01 /* aux port, PIT gate 2 input */ 79 #define PITAUX_OUT2 0x02 /* aux port, PIT clock out 2 enable */ 80 #define PIT_HZ 1193182 /* 8254's cycles per second */ 81 82 #ifdef __cplusplus 83 } 84 #endif 85 86 #endif /* _SYS_PIT_H */ 87