1/*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: head/sys/boot/i386/libi386/time.c 55211 1999-12-29 09:54:46Z msmith $
27 */
28
29#include <stand.h>
30#include <btxv86.h>
31
32/*
33 * Return the time in seconds since the beginning of the day.
34 *
35 * If we pass midnight, don't wrap back to 0.
36 *
37 * XXX uses undocumented BCD support from libstand.
38 */
39
40time_t
41time(time_t *t)
42{
43 static time_t lasttime, now;
44 int hr, min, sec;
45
46 v86.ctl = 0;
47 v86.addr = 0x1a; /* int 0x1a, function 2 */
48 v86.eax = 0x0200;
49 v86int();
50
51 hr = bcd2bin((v86.ecx & 0xff00) >> 8); /* hour in %ch */
52 min = bcd2bin(v86.ecx & 0xff); /* minute in %cl */
53 sec = bcd2bin((v86.edx & 0xff00) >> 8); /* second in %dh */
54
55 now = hr * 3600 + min * 60 + sec;
56 if (now < lasttime)
57 now += 24 * 3600;
58 lasttime = now;
59
60 if (t != NULL)
61 *t = now;
62 return(now);
63}

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