114 lines
2.8 KiB
C
114 lines
2.8 KiB
C
/* qemu-time.c -- stubs so clock can be linked in.
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*
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* Copyright (c) 2008 Anthony Green
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice is included verbatim in any distributions. No written agreement,
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* license, or royalty fee is required for any of the authorized uses.
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* Modifications to this software may be copyrighted by their authors
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* and need not follow the licensing terms described here, provided that
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* the new terms are clearly indicated on the first page of each file where
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* they apply.
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*/
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#include <errno.h>
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#include <time.h>
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#include <sys/time.h>
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#include <sys/times.h>
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#include "glue.h"
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/* This is the base address of the mc146818 RTC i/o port. */
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#define RTC_PORT 0x400
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#define RTC_SECONDS 0x00
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#define RTC_SECONDS_ALARM 0x01
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#define RTC_MINUTES 0x02
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#define RTC_MINUTES_ALARM 0x03
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#define RTC_HOURS 0x04
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#define RTC_HOURS_ALARM 0x05
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#define RTC_DAY_OF_WEEK 0x06
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#define RTC_DATE_OF_MONTH 0x07
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#define RTC_MONTH 0x08
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#define RTC_YEAR 0x09
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#define RTC_CONFIG_A 0x0A
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#define RTC_CONFIG_B 0x0B
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#define RTC_CONFIG_C 0x0C
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#define RTC_CONFIG_D 0x0D
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/*
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* _times -- FIXME
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*/
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int
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_times (struct tms *buf)
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{
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errno = EINVAL;
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return (-1);
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}
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/* Read a value from the RTC port. */
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static unsigned char
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rtc_read (unsigned char reg)
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{
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*(volatile unsigned char *)(RTC_PORT) = reg;
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return *(volatile unsigned char *)(RTC_PORT + 1);
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}
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/* Write a value to the RTC port. */
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static void
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rtc_write (unsigned char reg, unsigned char val)
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{
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*(volatile unsigned char *)(RTC_PORT) = reg;
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*(volatile unsigned char *)(RTC_PORT + 1) = val;
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}
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/* Convert BCD to Decimal. */
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#define BCD2DEC(BYTE) ((((BYTE >> 4) & 0xF) * 10) + (BYTE & 0xF))
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/*
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* time -- return current time in seconds.
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*/
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time_t
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time (time_t *t)
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{
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struct tm tm;
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time_t ret;
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tm.tm_sec = BCD2DEC(rtc_read(RTC_SECONDS));
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tm.tm_min = BCD2DEC(rtc_read(RTC_MINUTES));
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tm.tm_hour = BCD2DEC(rtc_read(RTC_HOURS));
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tm.tm_wday = BCD2DEC(rtc_read(RTC_DAY_OF_WEEK)) - 1;
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tm.tm_mday = BCD2DEC(rtc_read(RTC_DATE_OF_MONTH));
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tm.tm_mon = BCD2DEC(rtc_read(RTC_MONTH)) - 1;
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tm.tm_year = BCD2DEC(rtc_read(RTC_YEAR)) + 100;
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/* FIXME. Not really sure how to handle this. */
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tm.tm_isdst = 1;
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ret = mktime(&tm);
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if (t)
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*t = ret;
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return ret;
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}
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/*
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* _gettimeofday -- implement in terms of time, which means we can't
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* return the microseconds.
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*/
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int
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_gettimeofday (struct timeval *tv,
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void *tzvp)
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{
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struct timezone *tz = tzvp;
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struct tm tm;
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if (tz)
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tz->tz_minuteswest = tz->tz_dsttime = 0;
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tv->tv_usec = 0;
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tv->tv_sec = time(0);
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return 0;
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}
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