/* $NetBSD: clock.c,v 1.8 2006/06/25 17:35:12 tsutsui Exp $ */ /* * Copyright (c) 1982, 1990, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department. * * 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. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 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. * * from: Utah $Hdr: clock.c 1.18 91/01/21$ * * @(#)clock.c 8.2 (Berkeley) 1/12/94 */ /* * Copyright (c) 1988 University of Utah. * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department. * * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 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. * * from: Utah $Hdr: clock.c 1.18 91/01/21$ * * @(#)clock.c 8.2 (Berkeley) 1/12/94 */ #include #include #include #include #include #include #include #include #define FEBRUARY 2 #define STARTOFTIME 1970 #define SECDAY (60L * 60L * 24L) #define SECYR (SECDAY * 365) #define BBC_SET_REG 0xe0 #define BBC_WRITE_REG 0xc2 #define BBC_READ_REG 0xc3 #define NUM_BBC_REGS 12 #define leapyear(year) ((year) % 4 == 0) #define range_test(n, l, h) if ((n) < (l) || (n) > (h)) return 0 #define days_in_year(a) (leapyear(a) ? 366 : 365) #define days_in_month(a) (month_days[(a) - 1]) #define bbc_to_decimal(a,b) (bbc_registers[a] * 10 + bbc_registers[b]) static const int month_days[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; u_char bbc_registers[13]; struct hil_dev *bbcaddr = BBCADDR; static int bbc_to_gmt(time_t *); time_t getsecs(void) { static int bbcinited = 0; time_t timbuf = 0; if (!bbc_to_gmt(&timbuf) && !bbcinited) printf("WARNING: bad date in battery clock\n"); bbcinited = 1; /* Battery clock does not store usec's, so forget about it. */ return timbuf; } static int bbc_to_gmt(time_t *timbuf) { int i; u_long tmp; int year, month, day, hour, min, sec; read_bbc(); sec = bbc_to_decimal(1, 0); min = bbc_to_decimal(3, 2); /* * Hours are different for some reason. Makes no sense really. */ hour = ((bbc_registers[5] & 0x03) * 10) + bbc_registers[4]; day = bbc_to_decimal(8, 7); month = bbc_to_decimal(10, 9); year = bbc_to_decimal(12, 11) + 1900; if (year < STARTOFTIME) year += 100; range_test(hour, 0, 23); range_test(day, 1, 31); range_test(month, 1, 12); tmp = 0; for (i = STARTOFTIME; i < year; i++) tmp += days_in_year(i); if (leapyear(year) && month > FEBRUARY) tmp++; for (i = 1; i < month; i++) tmp += days_in_month(i); tmp += (day - 1); tmp = ((tmp * 24 + hour) * 60 + min) * 60 + sec; *timbuf = tmp; return 1; } void read_bbc(void) { int i, read_okay; read_okay = 0; while (!read_okay) { read_okay = 1; for (i = 0; i <= NUM_BBC_REGS; i++) bbc_registers[i] = read_bbc_reg(i); for (i = 0; i <= NUM_BBC_REGS; i++) if (bbc_registers[i] != read_bbc_reg(i)) read_okay = 0; } } u_char read_bbc_reg(int reg) { u_char data = reg; if (bbcaddr) { #if 0 send_hil_cmd(bbcaddr, BBC_SET_REG, &data, 1, NULL); send_hil_cmd(bbcaddr, BBC_READ_REG, NULL, 0, &data); #else HILWAIT(bbcaddr); bbcaddr->hil_cmd = BBC_SET_REG; HILWAIT(bbcaddr); bbcaddr->hil_data = data; HILWAIT(bbcaddr); bbcaddr->hil_cmd = BBC_READ_REG; HILDATAWAIT(bbcaddr); data = bbcaddr->hil_data; #endif } return data; }