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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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