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Annotation of kernel/machdep/i386/aux_timer_inline.h, revision 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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