osfmk/i386/pit.h

   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  Software.Distribution@CS.CMU.EDU
  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 */