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Annotation of kernel/machdep/i386/aux_timer_inline.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:  * Auxillary event timing using TIMER 2.
                     29:  *
                     30:  * HISTORY
                     31:  *
                     32:  * 17 June 1992 ? at NeXT
                     33:  *     Created.
                     34:  */
                     35: 
                     36: #import <machdep/i386/timer_inline.h>
                     37: 
                     38: static inline
                     39: aux_timer_init(
                     40:     void
                     41: )
                     42: {
                     43:     timer_ctl_reg_t    reg;
                     44: 
                     45:     reg = (timer_ctl_reg_t) { 0 };
                     46: 
                     47:     reg.mode = TIMER_EVENTMODE;
                     48:     reg.rw = TIMER_CTL_RW_BOTH;
                     49:     reg.sel = TIMER_CNT2_SEL;
                     50:     timer_set_ctl(reg);
                     51: 
                     52:     outb(0x61, inb(0x61) | 0x3);       /* XXX enable the TIMER2 gate */
                     53: }
                     54: 
                     55: static inline
                     56: aux_timer_start(
                     57:     void
                     58: )
                     59: {
                     60:     timer_write(TIMER_CNT2_SEL, TIMER_COUNT_MAX);
                     61: }
                     62: 
                     63: static inline
                     64: aux_timer_stop(
                     65:     unsigned int *     cnt
                     66: )
                     67: {
                     68:     timer_cnt_val_t    leftover;
                     69: 
                     70:     timer_latch(TIMER_CNT2_SEL); leftover = timer_read(TIMER_CNT2_SEL);
                     71: 
                     72:     *cnt = TIMER_COUNT_MAX - leftover;
                     73: }

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