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Annotation of kernel/machdep/i386/timer.h, revision 1.1.1.1

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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