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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/um/kernel/time.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/um/kernel/time.c')
-rw-r--r--arch/um/kernel/time.c167
1 files changed, 167 insertions, 0 deletions
diff --git a/arch/um/kernel/time.c b/arch/um/kernel/time.c
new file mode 100644
index 000000000000..c40c86a3f918
--- /dev/null
+++ b/arch/um/kernel/time.c
@@ -0,0 +1,167 @@
1/*
2 * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
4 */
5
6#include <stdio.h>
7#include <stdlib.h>
8#include <unistd.h>
9#include <time.h>
10#include <sys/time.h>
11#include <signal.h>
12#include <errno.h>
13#include "user_util.h"
14#include "kern_util.h"
15#include "user.h"
16#include "process.h"
17#include "signal_user.h"
18#include "time_user.h"
19#include "kern_constants.h"
20
21/* XXX This really needs to be declared and initialized in a kernel file since
22 * it's in <linux/time.h>
23 */
24extern struct timespec wall_to_monotonic;
25
26extern struct timeval xtime;
27
28struct timeval local_offset = { 0, 0 };
29
30void timer(void)
31{
32 gettimeofday(&xtime, NULL);
33 timeradd(&xtime, &local_offset, &xtime);
34}
35
36void set_interval(int timer_type)
37{
38 int usec = 1000000/hz();
39 struct itimerval interval = ((struct itimerval) { { 0, usec },
40 { 0, usec } });
41
42 if(setitimer(timer_type, &interval, NULL) == -1)
43 panic("setitimer failed - errno = %d\n", errno);
44}
45
46void enable_timer(void)
47{
48 int usec = 1000000/hz();
49 struct itimerval enable = ((struct itimerval) { { 0, usec },
50 { 0, usec }});
51 if(setitimer(ITIMER_VIRTUAL, &enable, NULL))
52 printk("enable_timer - setitimer failed, errno = %d\n",
53 errno);
54}
55
56void disable_timer(void)
57{
58 struct itimerval disable = ((struct itimerval) { { 0, 0 }, { 0, 0 }});
59 if((setitimer(ITIMER_VIRTUAL, &disable, NULL) < 0) ||
60 (setitimer(ITIMER_REAL, &disable, NULL) < 0))
61 printk("disnable_timer - setitimer failed, errno = %d\n",
62 errno);
63 /* If there are signals already queued, after unblocking ignore them */
64 set_handler(SIGALRM, SIG_IGN, 0, -1);
65 set_handler(SIGVTALRM, SIG_IGN, 0, -1);
66}
67
68void switch_timers(int to_real)
69{
70 struct itimerval disable = ((struct itimerval) { { 0, 0 }, { 0, 0 }});
71 struct itimerval enable = ((struct itimerval) { { 0, 1000000/hz() },
72 { 0, 1000000/hz() }});
73 int old, new;
74
75 if(to_real){
76 old = ITIMER_VIRTUAL;
77 new = ITIMER_REAL;
78 }
79 else {
80 old = ITIMER_REAL;
81 new = ITIMER_VIRTUAL;
82 }
83
84 if((setitimer(old, &disable, NULL) < 0) ||
85 (setitimer(new, &enable, NULL)))
86 printk("switch_timers - setitimer failed, errno = %d\n",
87 errno);
88}
89
90void uml_idle_timer(void)
91{
92 if(signal(SIGVTALRM, SIG_IGN) == SIG_ERR)
93 panic("Couldn't unset SIGVTALRM handler");
94
95 set_handler(SIGALRM, (__sighandler_t) alarm_handler,
96 SA_RESTART, SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1);
97 set_interval(ITIMER_REAL);
98}
99
100extern int do_posix_clock_monotonic_gettime(struct timespec *tp);
101
102void time_init(void)
103{
104 struct timespec now;
105
106 if(signal(SIGVTALRM, boot_timer_handler) == SIG_ERR)
107 panic("Couldn't set SIGVTALRM handler");
108 set_interval(ITIMER_VIRTUAL);
109
110 do_posix_clock_monotonic_gettime(&now);
111 wall_to_monotonic.tv_sec = -now.tv_sec;
112 wall_to_monotonic.tv_nsec = -now.tv_nsec;
113}
114
115/* Declared in linux/time.h, which can't be included here */
116extern void clock_was_set(void);
117
118void do_gettimeofday(struct timeval *tv)
119{
120 unsigned long flags;
121
122 flags = time_lock();
123 gettimeofday(tv, NULL);
124 timeradd(tv, &local_offset, tv);
125 time_unlock(flags);
126 clock_was_set();
127}
128
129int do_settimeofday(struct timespec *tv)
130{
131 struct timeval now;
132 unsigned long flags;
133 struct timeval tv_in;
134
135 if ((unsigned long) tv->tv_nsec >= UM_NSEC_PER_SEC)
136 return -EINVAL;
137
138 tv_in.tv_sec = tv->tv_sec;
139 tv_in.tv_usec = tv->tv_nsec / 1000;
140
141 flags = time_lock();
142 gettimeofday(&now, NULL);
143 timersub(&tv_in, &now, &local_offset);
144 time_unlock(flags);
145
146 return(0);
147}
148
149void idle_sleep(int secs)
150{
151 struct timespec ts;
152
153 ts.tv_sec = secs;
154 ts.tv_nsec = 0;
155 nanosleep(&ts, NULL);
156}
157
158/*
159 * Overrides for Emacs so that we follow Linus's tabbing style.
160 * Emacs will notice this stuff at the end of the file and automatically
161 * adjust the settings for this buffer only. This must remain at the end
162 * of the file.
163 * ---------------------------------------------------------------------------
164 * Local variables:
165 * c-file-style: "linux"
166 * End:
167 */