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/* $OpenBSD: time.c,v 1.17 2012/10/30 14:06:29 jsing Exp $ */
/*
* Copyright (c) 1997 Michael Shalayeff
* Copyright (c) 1997 Tobias Weingartner
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <sys/time.h>
#include <machine/biosvar.h>
#include <machine/pio.h>
#include "libsa.h"
#include "biosdev.h"
#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
/*
* Convert from bcd (packed) to int
*/
static __inline u_int8_t
bcdtoint(u_int8_t c)
{
return ((c & 0xf0) / 8) * 5 + (c & 0x0f);
}
/*
* Quick compute of time in seconds since the Epoch
*/
const u_short monthcount[] = {
0, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365
};
static __inline time_t
compute(int year, u_int8_t month, u_int8_t day, u_int8_t hour,
u_int8_t min, u_int8_t sec)
{
/* Number of days per month */
register time_t tt;
/* Compute days */
tt = (year - 1970) * 365 + monthcount[month] + day - 1;
/* Compute for leap year */
for (month <= 2 ? year-- : 0; year >= 1970; year--)
if (isleap(year))
tt++;
/* Plus the time */
tt = sec + 60 * (min + 60 * (tt * 24 + hour));
return tt;
}
static int
bios_time_date(int f, u_int8_t *b)
{
__asm __volatile(DOINT(0x1a) "\n\t"
"setc %b0\n\t"
"movb %%ch, 0(%2)\n\t"
"movb %%cl, 1(%2)\n\t"
"movb %%dh, 2(%2)\n\t"
"movb %%dl, 3(%2)\n\t"
: "=a" (f)
: "0" (f), "p" (b) : "%ecx", "%edx", "cc");
if (f & 0xff)
return -1;
else {
b[0] = bcdtoint(b[0]);
b[1] = bcdtoint(b[1]);
b[2] = bcdtoint(b[2]);
b[3] = bcdtoint(b[3]);
return 0;
}
}
static __inline int
biosdate(u_int8_t *b)
{
return bios_time_date(4 << 8, b);
}
static __inline int
biostime(u_int8_t *b)
{
return bios_time_date(2 << 8, b);
}
/*
* Return time since epoch
*/
time_t
getsecs(void)
{
u_int8_t timebuf[4], datebuf[4];
/* Query BIOS for time & date */
if (!biostime(timebuf) && !biosdate(datebuf)) {
#ifdef notdef
int dst;
dst = timebuf[3];
#endif
/* Convert to seconds since Epoch */
return compute(datebuf[0] * 100 + datebuf[1], datebuf[2],
datebuf[3], timebuf[0], timebuf[1], timebuf[2]);
} else
errno = EIO;
return 1;
}
u_int
sleep(u_int i)
{
register time_t t;
/*
* Loop for the requested number of seconds, polling BIOS,
* so that it may handle interrupts.
*/
for (t = getsecs() + i; getsecs() < t; cnischar())
;
return 0;
}
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