outb(addr, rtc_port);
outb(val, rtc_port + 1);
}
+
+/**
+ * Return 1 if the NVRAM is currently updating and a 0 otherwise
+ * @return A 1 if the NVRAM is updating and 0 otherwise
+ */
+
+int nvram_updating(void)
+{
+ return (nvram_read(NVRAM_RTC_FREQ_SELECT) & NVRAM_RTC_UIP) ? 1 : 0;
+}
+
+/**
+ * Get the current time and date from the RTC
+ *
+ * @param time A pointer to a broken-down time structure
+ */
+void rtc_read_clock(struct tm *time)
+{
+ memset(time, 0, sizeof(*time));
+
+ while(nvram_updating());
+
+ time->tm_mon = bcd2dec(nvram_read(NVRAM_RTC_MONTH)) - 1;
+ time->tm_sec = bcd2dec(nvram_read(NVRAM_RTC_SECONDS));
+ time->tm_min = bcd2dec(nvram_read(NVRAM_RTC_MINUTES));
+ time->tm_mday = bcd2dec(nvram_read(NVRAM_RTC_DAY));
+ time->tm_hour = bcd2dec(nvram_read(NVRAM_RTC_HOURS));
+
+ /* Instead of finding the century register,
+ we just make an assumption that if the year value is
+ less then 80, then it is 2000+
+ */
+
+ time->tm_year = bcd2dec(nvram_read(NVRAM_RTC_YEAR));
+
+ if (time->tm_year < 80)
+ time->tm_year += 100;
+}
+
+
--- /dev/null
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2008 Advanced Micro Devices, Inc.
+ *
+ * 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. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * 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 <libpayload.h>
+#include <arch/rdtsc.h>
+
+extern u32 cpu_khz;
+
+static struct {
+ u64 ticks;
+ time_t secs;
+ suseconds_t usecs;
+} clock;
+
+#define TICKS_PER_SEC (cpu_khz * 1000)
+#define TICKS_PER_USEC (cpu_khz / 1000)
+
+static void update_clock(void)
+{
+ u64 delta = rdtsc() - clock.ticks;
+ int secs;
+
+ clock.ticks += delta;
+
+ secs = (int) (delta / TICKS_PER_SEC);
+ clock.secs += secs;
+ delta -= (secs * TICKS_PER_SEC);
+ clock.usecs += (int) (delta / TICKS_PER_USEC);
+
+ if (clock.usecs > 1000000) {
+ clock.usecs -= 1000000;
+ clock.secs++;
+ }
+}
+
+#ifdef CONFIG_NVRAM
+
+static unsigned int day_of_year(int mon, int day, int year)
+{
+ static u8 mdays[12] = { 31, 28, 31, 30, 31, 30,
+ 31, 31, 30, 31, 30, 31 };
+
+ int i, ret = 0;
+
+ for(i = 0; i < mon; i++) {
+ ret += mdays[i];
+
+ if (i == 1 && (year % 4))
+ ret++;
+ }
+
+ return (ret + day);
+}
+
+static void gettimeofday_init(void)
+{
+ int days, delta;
+ struct tm tm;
+
+ rtc_read_clock(&tm);
+ clock.ticks = rdtsc();
+
+ /* Calculate the number of days in the year so far */
+ days = day_of_year(tm.tm_mon, tm.tm_mday, tm.tm_year + 1900);
+
+ delta = tm.tm_year - 70;
+
+ days += (delta * 365);
+
+ /* Figure leap years */
+
+ if (delta > 2)
+ days += (delta - 2) / 4;
+
+ clock.secs = (days * 86400) + (tm.tm_hour * 3600) +
+ (tm.tm_min * 60) + tm.tm_sec;
+}
+#else
+static void gettimeofday_init(void)
+{
+ /* Record the number of ticks */
+ clock.ticks = rdtsc();
+}
+#endif
+
+int gettimeofday(struct timeval *tv, void *tz)
+{
+ /* Call the gtod init when we need it - this keeps
+ the code from being included in the binary if we don't
+ need it
+ */
+
+ if (!clock.ticks)
+ gettimeofday_init();
+
+ update_clock();
+
+ tv->tv_sec = clock.secs;
+ tv->tv_usec = clock.usecs;
+
+ return 0;
+}
projects / coreboot.git / commitdiff