Initial source

1 files changed, 237 insertions, 0 deletions

diff --git a/i386/i386at/rtc.c b/i386/i386at/rtc.c
new file mode 100644
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+++ b/i386/i386at/rtc.c
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+
+/*
+  Copyright 1988, 1989 by Intel Corporation, Santa Clara, California.
+
+		All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and
+its documentation for any purpose and without fee is hereby
+granted, provided that the above copyright notice appears in all
+copies and that both the copyright notice and this permission notice
+appear in supporting documentation, and that the name of Intel
+not be used in advertising or publicity pertaining to distribution
+of the software without specific, written prior permission.
+
+INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
+INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
+IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
+CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
+NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
+WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#include <sys/types.h>
+#include <sys/time.h>
+#include <kern/time_out.h>
+#include <i386/machspl.h>
+#include <i386at/rtc.h>
+
+static unsigned char rtc[RTC_NREG];
+static int first_rtcopen_ever = 1;
+
+rtcinit()
+{
+	outb(RTC_ADDR, RTC_A);
+	outb(RTC_DATA, RTC_DIV2 | RTC_RATE6);
+	outb(RTC_ADDR, RTC_B);
+	outb(RTC_DATA, RTC_HM);
+}
+
+
+int
+rtcget(regs)
+unsigned char	*regs;
+{
+	if (first_rtcopen_ever) {
+		rtcinit();
+		first_rtcopen_ever = 0;
+	}
+	outb(RTC_ADDR, RTC_D); 
+	if (inb(RTC_DATA) & RTC_VRT == 0) return(-1);
+	outb(RTC_ADDR, RTC_A);	
+	while (inb(RTC_DATA) & RTC_UIP)		/* busy wait */
+		outb(RTC_ADDR, RTC_A);	
+	load_rtc(regs);
+	return(0);
+}	
+
+rtcput(regs)
+unsigned char 	*regs;
+{
+	register unsigned char	x;
+
+	if (first_rtcopen_ever) {
+		rtcinit();
+		first_rtcopen_ever = 0;
+	}
+	outb(RTC_ADDR, RTC_B);
+	x = inb(RTC_DATA);
+	outb(RTC_ADDR, RTC_B);
+	outb(RTC_DATA, x | RTC_SET); 	
+	save_rtc(regs);
+	outb(RTC_ADDR, RTC_B);
+	outb(RTC_DATA, x & ~RTC_SET); 
+}
+
+
+extern struct timeval time;
+extern struct timezone tz;
+
+static int month[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
+
+yeartoday(year)
+int year;
+{
+	return((year%4) ? 365 : 366);
+}
+
+hexdectodec(n)
+char n;
+{
+	return(((n>>4)&0x0F)*10 + (n&0x0F));
+}
+
+char
+dectohexdec(n)
+int n;
+{
+	return((char)(((n/10)<<4)&0xF0) | ((n%10)&0x0F));
+}
+
+
+readtodc(tp)
+	u_int	*tp;
+{
+	struct rtc_st rtclk;
+	time_t n;
+	int sec, min, hr, dom, mon, yr;
+	int i, days = 0;
+	spl_t	ospl;
+
+#ifdef	MACH_KERNEL
+	ospl = splclock();
+#else	MACH_KERNEL
+	ospl = spl5();
+#endif	MACH_KERNEL
+	if (rtcget(&rtclk)) {
+		splx(ospl);
+		return(-1);
+	}
+	splx (ospl);
+
+	sec = hexdectodec(rtclk.rtc_sec);
+	min = hexdectodec(rtclk.rtc_min);
+	hr = hexdectodec(rtclk.rtc_hr);
+	dom = hexdectodec(rtclk.rtc_dom);
+	mon = hexdectodec(rtclk.rtc_mon);
+	yr = hexdectodec(rtclk.rtc_yr);
+	yr = (yr < 70) ? yr+100 : yr;
+
+	n = sec + 60 * min + 3600 * hr;
+	n += (dom - 1) * 3600 * 24;
+
+	if (yeartoday(yr) == 366)
+		month[1] = 29;
+	for (i = mon - 2; i >= 0; i--)
+		days += month[i];
+	month[1] = 28;
+	for (i = 70; i < yr; i++)
+		days += yeartoday(i);
+	n += days * 3600 * 24;
+
+#ifdef	MACH_KERNEL
+#else	MACH_KERNEL
+	n += tz.tz_minuteswest * 60;
+	if (tz.tz_dsttime)
+		n -= 3600;
+#endif	MACH_KERNEL
+
+	*tp = n;
+
+	return(0);
+}
+
+writetodc()
+{
+	struct rtc_st rtclk;
+	time_t n;
+	int diff, i, j;
+	spl_t	ospl;
+
+#ifdef	MACH_KERNEL
+	ospl = splclock();
+#else	MACH_KERNEL
+	ospl = spl5();
+#endif	MACH_KERNEL
+	if (rtcget(&rtclk)) {
+		splx(ospl);
+		return(-1);
+	}
+	splx(ospl);
+
+#ifdef	MACH_KERNEL
+	diff = 0;
+#else	MACH_KERNEL
+	diff = tz.tz_minuteswest * 60;
+	if (tz.tz_dsttime)
+		diff -= 3600;
+#endif	MACH_KERNEL
+	n = (time.tv_sec - diff) % (3600 * 24);   /* hrs+mins+secs */
+	rtclk.rtc_sec = dectohexdec(n%60);
+	n /= 60;
+	rtclk.rtc_min = dectohexdec(n%60);
+	rtclk.rtc_hr = dectohexdec(n/60);
+
+	n = (time.tv_sec - diff) / (3600 * 24);	/* days */
+	rtclk.rtc_dow = (n + 4) % 7;  /* 1/1/70 is Thursday */
+
+	for (j = 1970, i = yeartoday(j); n >= i; j++, i = yeartoday(j))
+		n -= i;
+
+	rtclk.rtc_yr = dectohexdec(j - 1900);
+
+	if (i == 366)
+		month[1] = 29;
+	for (i = 0; n >= month[i]; i++)
+		n -= month[i];
+	month[1] = 28;
+	rtclk.rtc_mon = dectohexdec(++i);
+
+	rtclk.rtc_dom = dectohexdec(++n);
+
+#ifdef	MACH_KERNEL
+	ospl = splclock();
+#else	MACH_KERNEL
+	ospl = spl5();
+#endif	MACH_KERNEL
+	rtcput(&rtclk);
+	splx(ospl);
+
+	return(0);
+}