[unix-history] / sys / i386 / isa / clock.c

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz and Don Ahn.
 *
 * 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: @(#)clock.c	7.2 (Berkeley) 5/12/91
 *	$Id$
 */

/*
 * Primitive clock interrupt routines.
 */
#include "param.h"
#include "systm.h"
#include "time.h"
#include "kernel.h"
#include "machine/segments.h"
#include "i386/isa/icu.h"
#include "i386/isa/isa.h"
#include "i386/isa/rtc.h"
#include "i386/isa/timerreg.h"

#define DAYST 119
#define DAYEN 303

/* X-tals being what they are, it's nice to be able to fudge this one... */
/* Note, the name changed here from XTALSPEED to TIMER_FREQ rgrimes 4/26/93 */
#ifndef TIMER_FREQ
#define	TIMER_FREQ	1193182	/* XXX - should be in isa.h */
#endif

startrtclock() {
	int s;

	findcpuspeed();		/* use the clock (while it's free)
					to find the cpu speed */
	/* initialize 8253 clock */
	outb(TIMER_MODE, TIMER_SEL0|TIMER_RATEGEN|TIMER_16BIT);

	/* Correct rounding will buy us a better precision in timekeeping */
	outb (IO_TIMER1, (TIMER_FREQ+hz/2)/hz);
	outb (IO_TIMER1, ((TIMER_FREQ+hz/2)/hz)/256);

	/* initialize brain-dead battery powered clock */
	outb (IO_RTC, RTC_STATUSA);
	outb (IO_RTC+1, 0x26);
	outb (IO_RTC, RTC_STATUSB);
	outb (IO_RTC+1, 2);

	outb (IO_RTC, RTC_DIAG);
	if (s = inb (IO_RTC+1))
		printf("RTC BIOS diagnostic error %b\n", s, RTCDG_BITS);
	outb (IO_RTC, RTC_DIAG);
	outb (IO_RTC+1, 0);
}

unsigned int delaycount;	/* calibrated loop variable (1 millisecond) */

#define FIRST_GUESS	0x2000
findcpuspeed()
{
	unsigned char low;
	unsigned int remainder;

	/* Put counter in count down mode */
	outb(IO_TIMER1+3, 0x34);
	outb(IO_TIMER1, 0xff);
	outb(IO_TIMER1, 0xff);
	delaycount = FIRST_GUESS;
	spinwait(1);
	/* Read the value left in the counter */
	low 	= inb(IO_TIMER1);	/* least siginifcant */
	remainder = inb(IO_TIMER1);	/* most significant */
	remainder = (remainder<<8) + low ;
	/* Formula for delaycount is :
	 *  (loopcount * timer clock speed)/ (counter ticks * 1000)
	 */
	delaycount = (FIRST_GUESS * (TIMER_FREQ/1000)) / (0xffff-remainder);
}


/* convert 2 digit BCD number */
bcd(i)
int i;
{
	return ((i/16)*10 + (i%16));
}

/* convert years to seconds (from 1970) */
unsigned long
ytos(y)
int y;
{
	int i;
	unsigned long ret;

	ret = 0;
	for(i = 1970; i < y; i++) {
		if (i % 4) ret += 365*24*60*60;
		else ret += 366*24*60*60;
	}
	return ret;
}

/* convert months to seconds */
unsigned long
mtos(m,leap)
int m,leap;
{
	int i;
	unsigned long ret;

	ret = 0;
	for(i=1;i<m;i++) {
		switch(i){
		case 1: case 3: case 5: case 7: case 8: case 10: case 12:
			ret += 31*24*60*60; break;
		case 4: case 6: case 9: case 11:
			ret += 30*24*60*60; break;
		case 2:
			if (leap) ret += 29*24*60*60;
			else ret += 28*24*60*60;
		}
	}
	return ret;
}


/*
 * Initialize the time of day register, based on the time base which is, e.g.
 * from a filesystem.
 */
inittodr(base)
	time_t base;
{
	unsigned long sec;
	int leap,day_week,t,yd;
	int sa,s;

	/* do we have a realtime clock present? (otherwise we loop below) */
	sa = rtcin(RTC_STATUSA);
	if (sa == 0xff || sa == 0) return;

	/* ready for a read? */
	while ((sa&RTCSA_TUP) == RTCSA_TUP)
		sa = rtcin(RTC_STATUSA);

	sec = bcd(rtcin(RTC_YEAR)) + 1900;
	if (sec < 1970)
		sec += 100;
	leap = !(sec % 4); sec = ytos(sec); /* year    */
	yd = mtos(bcd(rtcin(RTC_MONTH)),leap); sec += yd;	/* month   */
	t = (bcd(rtcin(RTC_DAY))-1) * 24*60*60; sec += t; yd += t; /* date    */
	day_week = rtcin(RTC_WDAY);				/* day     */
	sec += bcd(rtcin(RTC_HRS)) * 60*60;			/* hour    */
	sec += bcd(rtcin(RTC_MIN)) * 60;			/* minutes */
	sec += bcd(rtcin(RTC_SEC));				/* seconds */

	/* XXX off by one? Need to calculate DST on SUNDAY */
	/* Perhaps we should have the RTC hold GMT time to save */
	/* us the bother of converting. */
	yd = yd / (24*60*60);
	if ((yd >= DAYST) && ( yd <= DAYEN)) {
		sec -= 60*60;
	}
	sec += tz.tz_minuteswest * 60;

	time.tv_sec = sec;
}

#ifdef garbage
/*
 * Initialze the time of day register, based on the time base which is, e.g.
 * from a filesystem.
 */
test_inittodr(base)
	time_t base;
{

	outb(IO_RTC,9); /* year    */
	printf("%d ",bcd(inb(IO_RTC+1)));
	outb(IO_RTC,8); /* month   */
	printf("%d ",bcd(inb(IO_RTC+1)));
	outb(IO_RTC,7); /* day     */
	printf("%d ",bcd(inb(IO_RTC+1)));
	outb(IO_RTC,4); /* hour    */
	printf("%d ",bcd(inb(IO_RTC+1)));
	outb(IO_RTC,2); /* minutes */
	printf("%d ",bcd(inb(IO_RTC+1)));
	outb(IO_RTC,0); /* seconds */
	printf("%d\n",bcd(inb(IO_RTC+1)));

	time.tv_sec = base;
}
#endif

/*
 * Restart the clock.
 */
resettodr()
{
}

/*
 * Wire clock interrupt in.
 */
#define V(s)	__CONCAT(V, s)
extern V(clk)();
enablertclock() {
	setidt(ICU_OFFSET+0, &V(clk), SDT_SYS386IGT, SEL_KPL);
	INTREN(IRQ0);
}

/*
 * Delay for some number of milliseconds.
 */
void
spinwait(millisecs)
	int millisecs;
{
	DELAY(1000 * millisecs);
}
Commit	Line	Data
15637ed4 RG	1	/*-
	2	* Copyright (c) 1990 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* This code is derived from software contributed to Berkeley by
	6	* William Jolitz and Don Ahn.
	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
	16	* 3. All advertising materials mentioning features or use of this software
	17	* must display the following acknowledgement:
	18	* This product includes software developed by the University of
	19	* California, Berkeley and its contributors.
	20	* 4. Neither the name of the University nor the names of its contributors
	21	* may be used to endorse or promote products derived from this software
	22	* without specific prior written permission.
	23	*
	24	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	25	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	26	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	27	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	28	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	29	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	30	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	31	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	32	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	33	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	34	* SUCH DAMAGE.
	35	*
78ed81a3	36	* from: @(#)clock.c 7.2 (Berkeley) 5/12/91
78ed81a3	37	* $Id$
15637ed4 RG	38	*/
	39
	40	/*
	41	* Primitive clock interrupt routines.
	42	*/
	43	#include "param.h"
	44	#include "systm.h"
	45	#include "time.h"
	46	#include "kernel.h"
	47	#include "machine/segments.h"
	48	#include "i386/isa/icu.h"
	49	#include "i386/isa/isa.h"
	50	#include "i386/isa/rtc.h"
	51	#include "i386/isa/timerreg.h"
	52
	53	#define DAYST 119
	54	#define DAYEN 303
	55
	56	/* X-tals being what they are, it's nice to be able to fudge this one... */
	57	/* Note, the name changed here from XTALSPEED to TIMER_FREQ rgrimes 4/26/93 */
	58	#ifndef TIMER_FREQ
	59	#define TIMER_FREQ 1193182 /* XXX - should be in isa.h */
	60	#endif
	61
	62	startrtclock() {
	63	int s;
	64
	65	findcpuspeed(); /* use the clock (while it's free)
	66	to find the cpu speed */
	67	/* initialize 8253 clock */
	68	outb(TIMER_MODE, TIMER_SEL0\|TIMER_RATEGEN\|TIMER_16BIT);
	69
	70	/* Correct rounding will buy us a better precision in timekeeping */
	71	outb (IO_TIMER1, (TIMER_FREQ+hz/2)/hz);
	72	outb (IO_TIMER1, ((TIMER_FREQ+hz/2)/hz)/256);
	73
	74	/* initialize brain-dead battery powered clock */
	75	outb (IO_RTC, RTC_STATUSA);
	76	outb (IO_RTC+1, 0x26);
	77	outb (IO_RTC, RTC_STATUSB);
	78	outb (IO_RTC+1, 2);
	79
	80	outb (IO_RTC, RTC_DIAG);
	81	if (s = inb (IO_RTC+1))
	82	printf("RTC BIOS diagnostic error %b\n", s, RTCDG_BITS);
	83	outb (IO_RTC, RTC_DIAG);
	84	outb (IO_RTC+1, 0);
	85	}
	86
	87	unsigned int delaycount; /* calibrated loop variable (1 millisecond) */
	88
	89	#define FIRST_GUESS 0x2000
	90	findcpuspeed()
	91	{
	92	unsigned char low;
	93	unsigned int remainder;
	94
	95	/* Put counter in count down mode */
	96	outb(IO_TIMER1+3, 0x34);
	97	outb(IO_TIMER1, 0xff);
	98	outb(IO_TIMER1, 0xff);
	99	delaycount = FIRST_GUESS;
	100	spinwait(1);
	101	/* Read the value left in the counter */
102	low = inb(IO_TIMER1); /* least siginifcant */
103	remainder = inb(IO_TIMER1); /* most significant */
104	remainder = (remainder<<8) + low ;
105	/* Formula for delaycount is :
106	* (loopcount * timer clock speed)/ (counter ticks * 1000)
107	*/
108	delaycount = (FIRST_GUESS * (TIMER_FREQ/1000)) / (0xffff-remainder);
109	}
110
111
112	/* convert 2 digit BCD number */
113	bcd(i)
114	int i;
115	{
116	return ((i/16)*10 + (i%16));
117	}
118
119	/* convert years to seconds (from 1970) */
120	unsigned long
121	ytos(y)
122	int y;
123	{
124	int i;
125	unsigned long ret;
126
127	ret = 0;
128	for(i = 1970; i < y; i++) {
129	if (i % 4) ret += 3652460*60;
130	else ret += 3662460*60;
131	}
132	return ret;
133	}
134
135	/* convert months to seconds */
136	unsigned long
137	mtos(m,leap)
138	int m,leap;
139	{
140	int i;
141	unsigned long ret;
142
143	ret = 0;
144	for(i=1;i<m;i++) {
145	switch(i){
146	case 1: case 3: case 5: case 7: case 8: case 10: case 12:
147	ret += 312460*60; break;
148	case 4: case 6: case 9: case 11:
149	ret += 302460*60; break;
150	case 2:
151	if (leap) ret += 292460*60;
152	else ret += 282460*60;
153	}
154	}
155	return ret;
156	}
157
158
159	/*
160	* Initialize the time of day register, based on the time base which is, e.g.
161	* from a filesystem.
162	*/
163	inittodr(base)
164	time_t base;
165	{
166	unsigned long sec;
167	int leap,day_week,t,yd;
168	int sa,s;
169
170	/* do we have a realtime clock present? (otherwise we loop below) */
171	sa = rtcin(RTC_STATUSA);
172	if (sa == 0xff \|\| sa == 0) return;
173
174	/* ready for a read? */
175	while ((sa&RTCSA_TUP) == RTCSA_TUP)
176	sa = rtcin(RTC_STATUSA);
177
178	sec = bcd(rtcin(RTC_YEAR)) + 1900;
179	if (sec < 1970)
180	sec += 100;
181	leap = !(sec % 4); sec = ytos(sec); /* year */
182	yd = mtos(bcd(rtcin(RTC_MONTH)),leap); sec += yd; /* month */
183	t = (bcd(rtcin(RTC_DAY))-1) * 246060; sec += t; yd += t; /* date */
184	day_week = rtcin(RTC_WDAY); /* day */
185	sec += bcd(rtcin(RTC_HRS)) * 6060; / hour */
186	sec += bcd(rtcin(RTC_MIN)) * 60; /* minutes */
187	sec += bcd(rtcin(RTC_SEC)); /* seconds */
188
189	/* XXX off by one? Need to calculate DST on SUNDAY */
190	/* Perhaps we should have the RTC hold GMT time to save */
191	/* us the bother of converting. */
192	yd = yd / (246060);
193	if ((yd >= DAYST) && ( yd <= DAYEN)) {
194	sec -= 60*60;
195	}
196	sec += tz.tz_minuteswest * 60;
197
198	time.tv_sec = sec;
199	}
200
201	#ifdef garbage
202	/*
203	* Initialze the time of day register, based on the time base which is, e.g.
204	* from a filesystem.
205	*/
206	test_inittodr(base)
207	time_t base;
208	{
209
210	outb(IO_RTC,9); /* year */
211	printf("%d ",bcd(inb(IO_RTC+1)));
212	outb(IO_RTC,8); /* month */
213	printf("%d ",bcd(inb(IO_RTC+1)));
214	outb(IO_RTC,7); /* day */
215	printf("%d ",bcd(inb(IO_RTC+1)));
216	outb(IO_RTC,4); /* hour */
217	printf("%d ",bcd(inb(IO_RTC+1)));
218	outb(IO_RTC,2); /* minutes */
219	printf("%d ",bcd(inb(IO_RTC+1)));
220	outb(IO_RTC,0); /* seconds */
221	printf("%d\n",bcd(inb(IO_RTC+1)));
222
223	time.tv_sec = base;
224	}
225	#endif
226
227	/*
228	* Restart the clock.
229	*/
230	resettodr()
231	{
232	}
233
234	/*
235	* Wire clock interrupt in.
236	*/
237	#define V(s) __CONCAT(V, s)
238	extern V(clk)();
239	enablertclock() {
240	setidt(ICU_OFFSET+0, &V(clk), SDT_SYS386IGT, SEL_KPL);
241	INTREN(IRQ0);
242	}
243
244	/*
245	* Delay for some number of milliseconds.
246	*/
247	void
248	spinwait(millisecs)
249	int millisecs;
250	{
251	DELAY(1000 * millisecs);
252	}