home *** CD-ROM | disk | FTP | other *** search
- /* Copyright (c) 1984, 1986, 1987, 1988 AT&T */
- /* All Rights Reserved */
-
- /* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */
- /* The copyright notice above does not evidence any */
- /* actual or intended publication of such source code. */
-
-
- #ident "@(#)head.sys:pit.h 1.3"
-
- /*
- * INTEL CORPORATION PROPRIETARY INFORMATION
- *
- * This software is supplied under the terms of a license
- * agreement or nondisclosure agreement with Intel Corpo-
- * ration and may not be copied or disclosed except in
- * accordance with the terms of that agreement.
- */
-
- #ifdef MB1
- /* Definitions for 8254 Programmable Interrupt Timer ports on 386/20 */
- #define PITCTR0_PORT 0xD0 /* counter 0 port */
- #define PITCTR1_PORT 0xD2 /* counter 1 port */
- #define PITCTR2_PORT 0xD4 /* counter 2 port */
- #define PITCTL_PORT 0xD6 /* PIT control port */
- #endif
- #ifdef AT386
- /* Definitions for 8254 Programmable Interrupt Timer ports on AT 386 */
- #define PITCTR0_PORT 0x40 /* counter 0 port */
- #define PITCTR1_PORT 0x41 /* counter 1 port */
- #define PITCTR2_PORT 0x42 /* counter 2 port */
- #define PITCTL_PORT 0x43 /* PIT control port */
- #define PITAUX_PORT 0x61 /* PIT auxiliary port */
- #endif /* AT386 */
-
- /* Definitions for 8254 commands */
-
- /* Following are used for Timer 0 */
- #define PIT_C0 0x00 /* select counter 0 */
- #define PIT_LOADMODE 0x30 /* load least significant byte followed
- * by most significant byte */
- #define PIT_NDIVMODE 0x04 /*divide by N counter */
- #define PIT_SQUAREMODE 0x06 /* square-wave mode */
-
- /* Used for Timer 1. Used for delay calculations in countdown mode */
- #define PIT_C1 0x40 /* select counter 1 */
- #define PIT_READMODE 0x30 /* read or load least significant byte
- * followed by most significant byte */
- #define PIT_RATEMODE 0x06 /* square-wave mode for USART */
-
- #ifdef MB1
- #define CLKNUM 12300 /* clock speed for the timer in hz
- * divided by the constant HZ
- * ( defined in param.h )
- */
- #endif
- #ifdef AT386
- #define CLKNUM (1193167/HZ) /* clock speed for timer */
- /* bits used in auxiliary control port for timer 2 */
- #define PITAUX_GATE2 0x01 /* aux port, PIT gate 2 input */
- #define PITAUX_OUT2 0x02 /* aux port, PIT clock out 2 enable */
- #endif /* AT386 */
-
-