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Annotation of XNU/osfmk/i386/pit.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * @OSF_COPYRIGHT@
        !            24:  */
        !            25: /* 
        !            26:  * Mach Operating System
        !            27:  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
        !            28:  * All Rights Reserved.
        !            29:  * 
        !            30:  * Permission to use, copy, modify and distribute this software and its
        !            31:  * documentation is hereby granted, provided that both the copyright
        !            32:  * notice and this permission notice appear in all copies of the
        !            33:  * software, derivative works or modified versions, and any portions
        !            34:  * thereof, and that both notices appear in supporting documentation.
        !            35:  * 
        !            36:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            37:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            38:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            39:  * 
        !            40:  * Carnegie Mellon requests users of this software to return to
        !            41:  * 
        !            42:  *  Software Distribution Coordinator  or  [email protected]
        !            43:  *  School of Computer Science
        !            44:  *  Carnegie Mellon University
        !            45:  *  Pittsburgh PA 15213-3890
        !            46:  * 
        !            47:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            48:  * the rights to redistribute these changes.
        !            49:  */
        !            50: /* 
        !            51:  */
        !            52: 
        !            53: /*
        !            54:   Copyright 1988, 1989 by Intel Corporation, Santa Clara, California.
        !            55: 
        !            56:                All Rights Reserved
        !            57: 
        !            58: Permission to use, copy, modify, and distribute this software and
        !            59: its documentation for any purpose and without fee is hereby
        !            60: granted, provided that the above copyright notice appears in all
        !            61: copies and that both the copyright notice and this permission notice
        !            62: appear in supporting documentation, and that the name of Intel
        !            63: not be used in advertising or publicity pertaining to distribution
        !            64: of the software without specific, written prior permission.
        !            65: 
        !            66: INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
        !            67: INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
        !            68: IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
        !            69: CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
        !            70: LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
        !            71: NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
        !            72: WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
        !            73: */
        !            74: 
        !            75: #include <platforms.h>
        !            76: /* Definitions for 8254 Programmable Interrupt Timer ports on AT 386 */
        !            77: #define PITCTR0_PORT   0x40            /* counter 0 port */    
        !            78: #define PITCTR1_PORT   0x41            /* counter 1 port */    
        !            79: #define PITCTR2_PORT   0x42            /* counter 2 port */    
        !            80: #define PITCTL_PORT    0x43            /* PIT control port */
        !            81: #define PITAUX_PORT    0x61            /* PIT auxiliary port */
        !            82: /* bits used in auxiliary control port for timer 2 */
        !            83: #define PITAUX_GATE2   0x01            /* aux port, PIT gate 2 input */
        !            84: #define PITAUX_OUT2    0x02            /* aux port, PIT clock out 2 enable */
        !            85: 
        !            86: /* Following are used for Timer 0 */
        !            87: #define PIT_C0          0x00            /* select counter 0 */
        !            88: #define PIT_LOADMODE   0x30            /* load least significant byte followed
        !            89:                                         * by most significant byte */
        !            90: #define PIT_NDIVMODE   0x04            /*divide by N counter */
        !            91: #define PIT_SQUAREMODE 0x06            /* square-wave mode */
        !            92: 
        !            93: /* Used for Timer 1. Used for delay calculations in countdown mode */
        !            94: #define PIT_C1          0x40            /* select counter 1 */
        !            95: #define PIT_READMODE   0x30            /* read or load least significant byte
        !            96:                                         * followed by most significant byte */
        !            97: #define PIT_RATEMODE   0x06            /* square-wave mode for USART */
        !            98: 
        !            99: /*
        !           100:  * Clock speed for the timer in hz divided by the constant HZ
        !           101:  * (defined in param.h)
        !           102:  */
        !           103: #define CLKNUM         1193167
        !           104: 
        !           105: #if    EXL
        !           106: /* added micro-timer support.   --- csy */
        !           107: typedef struct time_latch {
        !           108:                time_t  ticks;          /* time in HZ since boot */
        !           109:                time_t  uticks;         /* time in 1.25 MHZ */
        !           110: /* don't need these two for now.   --- csy */
        !           111: /*             time_t  secs;           \* seconds since boot */
        !           112: /*             time_t  epochsecs;      \* seconds since epoch */
        !           113:        } time_latch;
        !           114: /* a couple in-line assembly codes for efficiency. */
        !           115: asm  int   intr_disable()
        !           116: {
        !           117:      pushfl
        !           118:      cli
        !           119: }
        !           120: 
        !           121: asm  int   intr_restore()
        !           122: {
        !           123:      popfl
        !           124: }
        !           125: 
        !           126: #endif /* EXL */

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