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clock.c (700) clock.c (798)
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

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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 *
36 * from: @(#)clock.c 7.2 (Berkeley) 5/12/91
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

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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 *
36 * from: @(#)clock.c 7.2 (Berkeley) 5/12/91
37 * $Id: clock.c,v 1.2 1993/10/16 13:45:44 rgrimes Exp $
37 * $Id: clock.c,v 1.3 1993/11/04 01:56:31 ache Exp $
38 */
39
40/*
41 * Primitive clock interrupt routines.
42 */
43#include "param.h"
44#include "systm.h"
45#include "time.h"

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51#include "i386/isa/timerreg.h"
52
53/* X-tals being what they are, it's nice to be able to fudge this one... */
54/* Note, the name changed here from XTALSPEED to TIMER_FREQ rgrimes 4/26/93 */
55#ifndef TIMER_FREQ
56#define TIMER_FREQ 1193182 /* XXX - should be in isa.h */
57#endif
58
38 */
39
40/*
41 * Primitive clock interrupt routines.
42 */
43#include "param.h"
44#include "systm.h"
45#include "time.h"

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51#include "i386/isa/timerreg.h"
52
53/* X-tals being what they are, it's nice to be able to fudge this one... */
54/* Note, the name changed here from XTALSPEED to TIMER_FREQ rgrimes 4/26/93 */
55#ifndef TIMER_FREQ
56#define TIMER_FREQ 1193182 /* XXX - should be in isa.h */
57#endif
58
59startrtclock() {
59static void findcpuspeed(void);
60
61void
62startrtclock()
63{
60 int s;
61
62 findcpuspeed(); /* use the clock (while it's free)
63 to find the cpu speed */
64 /* initialize 8253 clock */
65 outb(TIMER_MODE, TIMER_SEL0|TIMER_RATEGEN|TIMER_16BIT);
66
67 /* Correct rounding will buy us a better precision in timekeeping */

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79 printf("RTC BIOS diagnostic error %b\n", s, RTCDG_BITS);
80 outb (IO_RTC, RTC_DIAG);
81 outb (IO_RTC+1, 0);
82}
83
84unsigned int delaycount; /* calibrated loop variable (1 millisecond) */
85
86#define FIRST_GUESS 0x2000
64 int s;
65
66 findcpuspeed(); /* use the clock (while it's free)
67 to find the cpu speed */
68 /* initialize 8253 clock */
69 outb(TIMER_MODE, TIMER_SEL0|TIMER_RATEGEN|TIMER_16BIT);
70
71 /* Correct rounding will buy us a better precision in timekeeping */

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83 printf("RTC BIOS diagnostic error %b\n", s, RTCDG_BITS);
84 outb (IO_RTC, RTC_DIAG);
85 outb (IO_RTC+1, 0);
86}
87
88unsigned int delaycount; /* calibrated loop variable (1 millisecond) */
89
90#define FIRST_GUESS 0x2000
91static void
87findcpuspeed()
88{
89 unsigned char low;
90 unsigned int remainder;
91
92 /* Put counter in count down mode */
93 outb(IO_TIMER1+3, 0x34);
94 outb(IO_TIMER1, 0xff);

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102 /* Formula for delaycount is :
103 * (loopcount * timer clock speed)/ (counter ticks * 1000)
104 */
105 delaycount = (FIRST_GUESS * (TIMER_FREQ/1000)) / (0xffff-remainder);
106}
107
108
109/* convert 2 digit BCD number */
92findcpuspeed()
93{
94 unsigned char low;
95 unsigned int remainder;
96
97 /* Put counter in count down mode */
98 outb(IO_TIMER1+3, 0x34);
99 outb(IO_TIMER1, 0xff);

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107 /* Formula for delaycount is :
108 * (loopcount * timer clock speed)/ (counter ticks * 1000)
109 */
110 delaycount = (FIRST_GUESS * (TIMER_FREQ/1000)) / (0xffff-remainder);
111}
112
113
114/* convert 2 digit BCD number */
115int
110bcd(i)
116bcd(i)
111int i;
117 int i;
112{
113 return ((i/16)*10 + (i%16));
114}
115
116/* convert years to seconds (from 1970) */
117unsigned long
118ytos(y)
119int y;

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152 return ret;
153}
154
155
156/*
157 * Initialize the time of day register, based on the time base which is, e.g.
158 * from a filesystem.
159 */
118{
119 return ((i/16)*10 + (i%16));
120}
121
122/* convert years to seconds (from 1970) */
123unsigned long
124ytos(y)
125int y;

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158 return ret;
159}
160
161
162/*
163 * Initialize the time of day register, based on the time base which is, e.g.
164 * from a filesystem.
165 */
166void
160inittodr(base)
161 time_t base;
162{
163 unsigned long sec;
164 int leap,day_week,t,yd;
165 int sa,s;
166
167 /* do we have a realtime clock present? (otherwise we loop below) */

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212
213 time.tv_sec = base;
214}
215#endif
216
217/*
218 * Restart the clock.
219 */
167inittodr(base)
168 time_t base;
169{
170 unsigned long sec;
171 int leap,day_week,t,yd;
172 int sa,s;
173
174 /* do we have a realtime clock present? (otherwise we loop below) */

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219
220 time.tv_sec = base;
221}
222#endif
223
224/*
225 * Restart the clock.
226 */
227void
220resettodr()
221{
222}
223
224/*
225 * Wire clock interrupt in.
226 */
227#define V(s) __CONCAT(V, s)
228extern V(clk)();
228resettodr()
229{
230}
231
232/*
233 * Wire clock interrupt in.
234 */
235#define V(s) __CONCAT(V, s)
236extern V(clk)();
229enablertclock() {
237
238void
239enablertclock()
240{
230 setidt(ICU_OFFSET+0, &V(clk), SDT_SYS386IGT, SEL_KPL);
231 INTREN(IRQ0);
232}
233
234/*
235 * Delay for some number of milliseconds.
236 */
237void
238spinwait(millisecs)
239 int millisecs;
240{
241 DELAY(1000 * millisecs);
242}
241 setidt(ICU_OFFSET+0, &V(clk), SDT_SYS386IGT, SEL_KPL);
242 INTREN(IRQ0);
243}
244
245/*
246 * Delay for some number of milliseconds.
247 */
248void
249spinwait(millisecs)
250 int millisecs;
251{
252 DELAY(1000 * millisecs);
253}