direct-io.hg

view linux-2.6-xen-sparse/include/asm-x86_64/mach-xen/mach_time.h @ 11509:2e6c10dc7c0b

[POWERPC][XEN] make sure put_domain() is called in case of allocate_rma() failuer

Signed-off-by: Jimi Xenidis <jimix@watson.ibm.com>
Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
author Jimi Xenidis <jimix@watson.ibm.com>
date Tue Sep 12 10:53:46 2006 -0400 (2006-09-12)
parents fd9b2c1bb577
children 4fad820a2233
line source
1 /*
2 * include/asm-i386/mach-default/mach_time.h
3 *
4 * Machine specific set RTC function for generic.
5 * Split out from time.c by Osamu Tomita <tomita@cinet.co.jp>
6 */
7 #ifndef _MACH_TIME_H
8 #define _MACH_TIME_H
10 #include <asm-i386/mc146818rtc.h>
12 /* for check timing call set_rtc_mmss() 500ms */
13 /* used in arch/i386/time.c::do_timer_interrupt() */
14 #define USEC_AFTER 500000
15 #define USEC_BEFORE 500000
17 /*
18 * In order to set the CMOS clock precisely, set_rtc_mmss has to be
19 * called 500 ms after the second nowtime has started, because when
20 * nowtime is written into the registers of the CMOS clock, it will
21 * jump to the next second precisely 500 ms later. Check the Motorola
22 * MC146818A or Dallas DS12887 data sheet for details.
23 *
24 * BUG: This routine does not handle hour overflow properly; it just
25 * sets the minutes. Usually you'll only notice that after reboot!
26 */
27 static inline int mach_set_rtc_mmss(unsigned long nowtime)
28 {
29 int retval = 0;
30 int real_seconds, real_minutes, cmos_minutes;
31 unsigned char save_control, save_freq_select;
33 save_control = CMOS_READ(RTC_CONTROL); /* tell the clock it's being set */
34 CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL);
36 save_freq_select = CMOS_READ(RTC_FREQ_SELECT); /* stop and reset prescaler */
37 CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);
39 cmos_minutes = CMOS_READ(RTC_MINUTES);
40 if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
41 BCD_TO_BIN(cmos_minutes);
43 /*
44 * since we're only adjusting minutes and seconds,
45 * don't interfere with hour overflow. This avoids
46 * messing with unknown time zones but requires your
47 * RTC not to be off by more than 15 minutes
48 */
49 real_seconds = nowtime % 60;
50 real_minutes = nowtime / 60;
51 if (((abs(real_minutes - cmos_minutes) + 15)/30) & 1)
52 real_minutes += 30; /* correct for half hour time zone */
53 real_minutes %= 60;
55 if (abs(real_minutes - cmos_minutes) < 30) {
56 if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
57 BIN_TO_BCD(real_seconds);
58 BIN_TO_BCD(real_minutes);
59 }
60 CMOS_WRITE(real_seconds,RTC_SECONDS);
61 CMOS_WRITE(real_minutes,RTC_MINUTES);
62 } else {
63 printk(KERN_WARNING
64 "set_rtc_mmss: can't update from %d to %d\n",
65 cmos_minutes, real_minutes);
66 retval = -1;
67 }
69 /* The following flags have to be released exactly in this order,
70 * otherwise the DS12887 (popular MC146818A clone with integrated
71 * battery and quartz) will not reset the oscillator and will not
72 * update precisely 500 ms later. You won't find this mentioned in
73 * the Dallas Semiconductor data sheets, but who believes data
74 * sheets anyway ... -- Markus Kuhn
75 */
76 CMOS_WRITE(save_control, RTC_CONTROL);
77 CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
79 return retval;
80 }
82 static inline unsigned long mach_get_cmos_time(void)
83 {
84 unsigned int year, mon, day, hour, min, sec;
85 int i;
87 /* The Linux interpretation of the CMOS clock register contents:
88 * When the Update-In-Progress (UIP) flag goes from 1 to 0, the
89 * RTC registers show the second which has precisely just started.
90 * Let's hope other operating systems interpret the RTC the same way.
91 */
92 /* read RTC exactly on falling edge of update flag */
93 for (i = 0 ; i < 1000000 ; i++) /* may take up to 1 second... */
94 if (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP)
95 break;
96 for (i = 0 ; i < 1000000 ; i++) /* must try at least 2.228 ms */
97 if (!(CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP))
98 break;
99 do { /* Isn't this overkill ? UIP above should guarantee consistency */
100 sec = CMOS_READ(RTC_SECONDS);
101 min = CMOS_READ(RTC_MINUTES);
102 hour = CMOS_READ(RTC_HOURS);
103 day = CMOS_READ(RTC_DAY_OF_MONTH);
104 mon = CMOS_READ(RTC_MONTH);
105 year = CMOS_READ(RTC_YEAR);
106 } while (sec != CMOS_READ(RTC_SECONDS));
107 if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
108 {
109 BCD_TO_BIN(sec);
110 BCD_TO_BIN(min);
111 BCD_TO_BIN(hour);
112 BCD_TO_BIN(day);
113 BCD_TO_BIN(mon);
114 BCD_TO_BIN(year);
115 }
116 if ((year += 1900) < 1970)
117 year += 100;
119 return mktime(year, mon, day, hour, min, sec);
120 }
122 #endif /* !_MACH_TIME_H */