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 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 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.
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30#include <stand.h> 31#include <btxv86.h> 32#ifdef PC98 33#include <machine/cpufunc.h> 34#endif 35#include "bootstrap.h" 36#include "libi386.h" 37 38/* 39 * Return the time in seconds since the beginning of the day. 40 * 41 * If we pass midnight, don't wrap back to 0. 42 * 43 * XXX uses undocumented BCD support from libstand. 44 */ 45 46time_t 47time(time_t *t) 48{ 49 static time_t lasttime, now; 50 int hr, minute, sec; 51 52#ifdef PC98 53 unsigned char bios_time[6]; 54#endif 55 56 v86.ctl = 0; 57#ifdef PC98 58 v86.addr = 0x1c; /* int 0x1c, function 0 */ 59 v86.eax = 0x0000; 60 v86.es = VTOPSEG(bios_time); 61 v86.ebx = VTOPOFF(bios_time); 62#else 63 v86.addr = 0x1a; /* int 0x1a, function 2 */ 64 v86.eax = 0x0200; 65#endif 66 v86int(); 67 68#ifdef PC98 69 hr = bcd2bin(bios_time[3]); 70 minute = bcd2bin(bios_time[4]); 71 sec = bcd2bin(bios_time[5]); 72#else 73 hr = bcd2bin((v86.ecx & 0xff00) >> 8); /* hour in %ch */ 74 minute = bcd2bin(v86.ecx & 0xff); /* minute in %cl */ 75 sec = bcd2bin((v86.edx & 0xff00) >> 8); /* second in %dh */ 76#endif 77 78 now = hr * 3600 + minute * 60 + sec; 79 if (now < lasttime) 80 now += 24 * 3600; 81 lasttime = now; 82 83 if (t != NULL) 84 *t = now; 85 return(now); 86} 87 88/* 89 * Use the BIOS Wait function to pause for (period) microseconds. 90 * 91 * Resolution of this function is variable, but typically around 92 * 1ms. 93 */ 94void 95delay(int period) 96{ 97#ifdef PC98 98 int i; 99 period = (period + 500) / 1000; 100 for( ; period != 0 ; period--) 101 for(i=800;i != 0; i--) 102 outb(0x5f,0); /* wait 600ns */ 103#else 104 v86.ctl = 0; 105 v86.addr = 0x15; /* int 0x15, function 0x86 */ 106 v86.eax = 0x8600; 107 v86.ecx = period >> 16; 108 v86.edx = period & 0xffff; 109 v86int(); 110#endif 111}
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