This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / include / asm-x86_64 / mach-xen / mach_time.h

diff --git a/include/asm-x86_64/mach-xen/mach_time.h b/include/asm-x86_64/mach-xen/mach_time.h
new file mode 100644 (file)
index 0000000..2fbd606
--- /dev/null
+++ b/include/asm-x86_64/mach-xen/mach_time.h
@@ -0,0 +1,111 @@
+/*
+ *  include/asm-i386/mach-default/mach_time.h
+ *
+ *  Machine specific set RTC function for generic.
+ *  Split out from time.c by Osamu Tomita <tomita@cinet.co.jp>
+ */
+#ifndef _MACH_TIME_H
+#define _MACH_TIME_H
+
+#include <asm-i386/mc146818rtc.h>
+
+/* for check timing call set_rtc_mmss() 500ms     */
+/* used in arch/i386/time.c::do_timer_interrupt() */
+#define USEC_AFTER     500000
+#define USEC_BEFORE    500000
+
+/*
+ * In order to set the CMOS clock precisely, set_rtc_mmss has to be
+ * called 500 ms after the second nowtime has started, because when
+ * nowtime is written into the registers of the CMOS clock, it will
+ * jump to the next second precisely 500 ms later. Check the Motorola
+ * MC146818A or Dallas DS12887 data sheet for details.
+ *
+ * BUG: This routine does not handle hour overflow properly; it just
+ *      sets the minutes. Usually you'll only notice that after reboot!
+ */
+static inline int mach_set_rtc_mmss(unsigned long nowtime)
+{
+       int retval = 0;
+       int real_seconds, real_minutes, cmos_minutes;
+       unsigned char save_control, save_freq_select;
+
+       save_control = CMOS_READ(RTC_CONTROL); /* tell the clock it's being set */
+       CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL);
+
+       save_freq_select = CMOS_READ(RTC_FREQ_SELECT); /* stop and reset prescaler */
+       CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);
+
+       cmos_minutes = CMOS_READ(RTC_MINUTES);
+       if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
+               BCD_TO_BIN(cmos_minutes);
+
+       /*
+        * since we're only adjusting minutes and seconds,
+        * don't interfere with hour overflow. This avoids
+        * messing with unknown time zones but requires your
+        * RTC not to be off by more than 15 minutes
+        */
+       real_seconds = nowtime % 60;
+       real_minutes = nowtime / 60;
+       if (((abs(real_minutes - cmos_minutes) + 15)/30) & 1)
+               real_minutes += 30;             /* correct for half hour time zone */
+       real_minutes %= 60;
+
+       if (abs(real_minutes - cmos_minutes) < 30) {
+               if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
+                       BIN_TO_BCD(real_seconds);
+                       BIN_TO_BCD(real_minutes);
+               }
+               CMOS_WRITE(real_seconds,RTC_SECONDS);
+               CMOS_WRITE(real_minutes,RTC_MINUTES);
+       } else {
+               printk(KERN_WARNING
+                      "set_rtc_mmss: can't update from %d to %d\n",
+                      cmos_minutes, real_minutes);
+               retval = -1;
+       }
+
+       /* The following flags have to be released exactly in this order,
+        * otherwise the DS12887 (popular MC146818A clone with integrated
+        * battery and quartz) will not reset the oscillator and will not
+        * update precisely 500 ms later. You won't find this mentioned in
+        * the Dallas Semiconductor data sheets, but who believes data
+        * sheets anyway ...                           -- Markus Kuhn
+        */
+       CMOS_WRITE(save_control, RTC_CONTROL);
+       CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
+
+       return retval;
+}
+
+static inline unsigned long mach_get_cmos_time(void)
+{
+       unsigned int year, mon, day, hour, min, sec;
+
+       do {
+               sec = CMOS_READ(RTC_SECONDS);
+               min = CMOS_READ(RTC_MINUTES);
+               hour = CMOS_READ(RTC_HOURS);
+               day = CMOS_READ(RTC_DAY_OF_MONTH);
+               mon = CMOS_READ(RTC_MONTH);
+               year = CMOS_READ(RTC_YEAR);
+       } while (sec != CMOS_READ(RTC_SECONDS));
+
+       if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
+               BCD_TO_BIN(sec);
+               BCD_TO_BIN(min);
+               BCD_TO_BIN(hour);
+               BCD_TO_BIN(day);
+               BCD_TO_BIN(mon);
+               BCD_TO_BIN(year);
+       }
+
+       year += 1900;
+       if (year < 1970)
+               year += 100;
+
+       return mktime(year, mon, day, hour, min, sec);
+}
+
+#endif /* !_MACH_TIME_H */