osfmk/i386/pit.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * @OSF_COPYRIGHT@
  27  */
  28 /*
  29  * Mach Operating System
  30  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
  31  * All Rights Reserved.
  32  *
  33  * Permission to use, copy, modify and distribute this software and its
  34  * documentation is hereby granted, provided that both the copyright
  35  * notice and this permission notice appear in all copies of the
  36  * software, derivative works or modified versions, and any portions
  37  * thereof, and that both notices appear in supporting documentation.
  38  *
  39  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  40  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  41  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  42  *
  43  * Carnegie Mellon requests users of this software to return to
  44  *
  45  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  46  *  School of Computer Science
  47  *  Carnegie Mellon University
  48  *  Pittsburgh PA 15213-3890
  49  *
  50  * any improvements or extensions that they make and grant Carnegie Mellon
  51  * the rights to redistribute these changes.
  52  */
  53 /*
  54  */
  55
  56 /*
  57   Copyright 1988, 1989 by Intel Corporation, Santa Clara, California.
  58
  59                 All Rights Reserved
  60
  61 Permission to use, copy, modify, and distribute this software and
  62 its documentation for any purpose and without fee is hereby
  63 granted, provided that the above copyright notice appears in all
  64 copies and that both the copyright notice and this permission notice
  65 appear in supporting documentation, and that the name of Intel
  66 not be used in advertising or publicity pertaining to distribution
  67 of the software without specific, written prior permission.
  68
  69 INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
  70 INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
  71 IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
  72 CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  73 LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
  74 NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
  75 WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  76 */
  77
  78 #include <platforms.h>
  79 /* Definitions for 8254 Programmable Interrupt Timer ports on AT 386 */
  80 #define PITCTR0_PORT    0x40            /* counter 0 port */
  81 #define PITCTR1_PORT    0x41            /* counter 1 port */
  82 #define PITCTR2_PORT    0x42            /* counter 2 port */
  83 #define PITCTL_PORT     0x43            /* PIT control port */
  84 #define PITAUX_PORT     0x61            /* PIT auxiliary port */
  85 /* bits used in auxiliary control port for timer 2 */
  86 #define PITAUX_GATE2    0x01            /* aux port, PIT gate 2 input */
  87 #define PITAUX_OUT2     0x02            /* aux port, PIT clock out 2 enable */
  88
  89 /* Following are used for Timer 0 */
  90 #define PIT_C0          0x00            /* select counter 0 */
  91 #define PIT_LOADMODE    0x30            /* load least significant byte followed
  92                                          * by most significant byte */
  93 #define PIT_NDIVMODE    0x04            /*divide by N counter */
  94 #define PIT_SQUAREMODE  0x06            /* square-wave mode */
  95
  96 /* Used for Timer 1. Used for delay calculations in countdown mode */
  97 #define PIT_C1          0x40            /* select counter 1 */
  98 #define PIT_READMODE    0x30            /* read or load least significant byte
  99                                          * followed by most significant byte */
 100 #define PIT_RATEMODE    0x06            /* square-wave mode for USART */
 101
 102 /*
 103  * Clock speed for the timer in hz divided by the constant HZ
 104  * (defined in param.h)
 105  */
 106 #define CLKNUM          1193167
 107
 108 #if     EXL
 109 /* added micro-timer support.   --- csy */
 110 typedef struct time_latch {
 111                 time_t  ticks;          /* time in HZ since boot */
 112                 time_t  uticks;         /* time in 1.25 MHZ */
 113 /* don't need these two for now.   --- csy */
 114 /*              time_t  secs;           \* seconds since boot */
 115 /*              time_t  epochsecs;      \* seconds since epoch */
 116         } time_latch;
 117 /* a couple in-line assembly codes for efficiency. */
 118 asm  int   intr_disable()
 119 {
 120      pushfl
 121      cli
 122 }
 123
 124 asm  int   intr_restore()
 125 {
 126      popfl
 127 }
 128
 129 #endif  /* EXL */