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Annotation of kernel/machdep/i386/timer.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /*
        !            26:  * Copyright (c) 1992 NeXT Computer, Inc.
        !            27:  *
        !            28:  * 8253 Timer (PIT) definitions.
        !            29:  *
        !            30:  * HISTORY
        !            31:  *
        !            32:  * 30 May 1992 ? at NeXT
        !            33:  *     Formalized 8253 support.
        !            34:  *
        !            35:  * 24 March 1992 ? at NeXT
        !            36:  *     Created.
        !            37:  */
        !            38: 
        !            39: /*
        !            40:  * Control register.
        !            41:  */
        !            42: typedef struct {
        !            43:     unsigned char
        !            44:                        bcd             :1,
        !            45:                        mode            :3,
        !            46: #define TIMER_EVENTMODE                0               /* event timer */
        !            47: #define TIMER_1SHOTMODE                1               /* one-shot */
        !            48: #define TIMER_NDIVMODE         2               /* divide by n */
        !            49: #define TIMER_SQWAVEMODE       3               /* square wave generator */
        !            50: #define TIMER_SWTRIGMODE       4               /* software trigger */
        !            51: #define TIMER_HWTRIGMODE       5               /* hardware trigger */
        !            52:                        rw              :2,
        !            53: #define TIMER_CTL_LATCH                0
        !            54: #define TIMER_CTL_RW_LSB       1
        !            55: #define TIMER_CTL_RW_MSB       2
        !            56: #define TIMER_CTL_RW_BOTH      3
        !            57:                        sel             :2;
        !            58: #define TIMER_CNT0_SEL         0
        !            59: #define TIMER_CNT1_SEL         1
        !            60: #define TIMER_CNT2_SEL         2
        !            61: } timer_ctl_reg_t;
        !            62: 
        !            63: /*
        !            64:  * Counter value (16 bits)
        !            65:  */
        !            66: typedef unsigned short timer_cnt_val_t;
        !            67: 
        !            68: /*
        !            69:  * Maximum count value
        !            70:  */
        !            71: #define TIMER_COUNT_MAX        ((timer_cnt_val_t) -1)
        !            72: 
        !            73: /*
        !            74:  * Timer I/O ports
        !            75:  */
        !            76: #define TIMER_CNT0_PORT        0x40            /* counter 0 */ 
        !            77: #define TIMER_CNT1_PORT        0x41            /* counter 1 */ 
        !            78: #define TIMER_CNT2_PORT        0x42            /* counter 2 */ 
        !            79: #define TIMER_CTL_PORT 0x43            /* control port */
        !            80: 
        !            81: /*
        !            82:  * Timer count rate (1/s)
        !            83:  */
        !            84: #define TIMER_CONSTANT 1193167

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