clock.c revision 1.1 
1/*      $NetBSD: clock.c,v 1.1 2011/01/26 01:18:54 pooka Exp $ */
2
3/*-
4 * Copyright (c) 2010 The NetBSD Foundation, Inc.
5 * Copyright (c) 1999 The NetBSD Foundation, Inc.
6 * All rights reserved.
7 *
8 * This code was written by Alessandro Forin and Neil Pittman
9 * at Microsoft Research and contributed to The NetBSD Foundation
10 * by Microsoft Corporation.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
23 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 */
33
34#include <sys/types.h>
35#include <machine/emipsreg.h>
36
37#include <stand/common/common.h>
38
39long
40getsecs()
41{
42    struct _Tc *Tc = (struct _Tc *)TIMER_DEFAULT_ADDRESS;
43	uint64_t now;
44    static int inited = 0;
45
46    if (!inited) {
47        inited = 1;
48        Tc->Control = TCCT_ENABLE;
49    }
50
51    /* starts from 0 at powerup, and counts up */
52	now = Tc->FreeRunning;
53#if 0
54    /* requires full 64bit math support */
55    now = now / 10*1000*1000;
56#else
57    /* good nuf */
58    now = now >> 23;
59#endif
60    return (long) now;
61}
62