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head/sys/boot/pc98/libpc98/time.c
| Property | Old Value | New Value |
|---|---|---|
| svn:keywords | null | FreeBSD=%H \ No newline at end of property |
| /*- | |||||
| * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> | |||||
| * 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 AND CONTRIBUTORS ``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 AUTHOR 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/cdefs.h> | |||||
| __FBSDID("$FreeBSD$"); | |||||
| #include <stand.h> | |||||
| #include <btxv86.h> | |||||
| #include <machine/cpufunc.h> | |||||
| #include "bootstrap.h" | |||||
| #include "libi386.h" | |||||
| static int bios_seconds(void); | |||||
| /* | |||||
| * Return the BIOS time-of-day value. | |||||
| * | |||||
| * XXX uses undocumented BCD support from libstand. | |||||
| */ | |||||
| static int | |||||
| bios_seconds(void) | |||||
| { | |||||
| int hr, minute, sec; | |||||
| unsigned char bios_time[6]; | |||||
| v86.ctl = 0; | |||||
| v86.addr = 0x1c; /* int 0x1c, function 0 */ | |||||
| v86.eax = 0x0000; | |||||
| v86.es = VTOPSEG(bios_time); | |||||
| v86.ebx = VTOPOFF(bios_time); | |||||
| v86int(); | |||||
| hr = bcd2bin(bios_time[3]); | |||||
| minute = bcd2bin(bios_time[4]); | |||||
| sec = bcd2bin(bios_time[5]); | |||||
| return (hr * 3600 + minute * 60 + sec); | |||||
| } | |||||
| /* | |||||
| * Return the time in seconds since the beginning of the day. | |||||
| */ | |||||
| time_t | |||||
| time(time_t *t) | |||||
| { | |||||
| static time_t lasttime; | |||||
| time_t now; | |||||
| now = bios_seconds(); | |||||
| if (now < lasttime) | |||||
| now += 24 * 3600; | |||||
| lasttime = now; | |||||
| if (t != NULL) | |||||
| *t = now; | |||||
| return(now); | |||||
| } | |||||
| /* | |||||
| * Use the BIOS Wait function to pause for (period) microseconds. | |||||
| * | |||||
| * Resolution of this function is variable, but typically around | |||||
| * 1ms. | |||||
| */ | |||||
| void | |||||
| delay(int period) | |||||
| { | |||||
| int i; | |||||
| period = (period + 500) / 1000; | |||||
| for( ; period != 0 ; period--) | |||||
| for(i=800;i != 0; i--) | |||||
| outb(0x5f,0); /* wait 600ns */ | |||||
| } | |||||