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 @@
+/* 
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <time.h>
+#include <sys/time.h>
+#include <signal.h>
+#include <errno.h>
+#include "user_util.h"
+#include "kern_util.h"
+#include "user.h"
+#include "process.h"
+#include "signal_user.h"
+#include "time_user.h"
+#include "kern_constants.h"
+
+/* XXX This really needs to be declared and initialized in a kernel file since
+ * it's in <linux/time.h>
+ */
+extern struct timespec wall_to_monotonic;
+
+extern struct timeval xtime;
+
+struct timeval local_offset = { 0, 0 };
+
+void timer(void)
+{
+        gettimeofday(&xtime, NULL);
+        timeradd(&xtime, &local_offset, &xtime);
+}
+
+void set_interval(int timer_type)
+{
+        int usec = 1000000/hz();
+        struct itimerval interval = ((struct itimerval) { { 0, usec },
+                                                          { 0, usec } });
+
+        if(setitimer(timer_type, &interval, NULL) == -1)
+                panic("setitimer failed - errno = %d\n", errno);
+}
+
+void enable_timer(void)
+{
+        int usec = 1000000/hz();
+        struct itimerval enable = ((struct itimerval) { { 0, usec },
+                                                        { 0, usec }});
+        if(setitimer(ITIMER_VIRTUAL, &enable, NULL))
+                printk("enable_timer - setitimer failed, errno = %d\n",
+                       errno);
+}
+
+void disable_timer(void)
+{
+        struct itimerval disable = ((struct itimerval) { { 0, 0 }, { 0, 0 }});
+        if((setitimer(ITIMER_VIRTUAL, &disable, NULL) < 0) ||
+           (setitimer(ITIMER_REAL, &disable, NULL) < 0))
+                printk("disnable_timer - setitimer failed, errno = %d\n",
+                       errno);
+        /* If there are signals already queued, after unblocking ignore them */
+        set_handler(SIGALRM, SIG_IGN, 0, -1);
+        set_handler(SIGVTALRM, SIG_IGN, 0, -1);
+}
+
+void switch_timers(int to_real)
+{
+        struct itimerval disable = ((struct itimerval) { { 0, 0 }, { 0, 0 }});
+        struct itimerval enable = ((struct itimerval) { { 0, 1000000/hz() },
+                                                        { 0, 1000000/hz() }});
+        int old, new;
+
+        if(to_real){
+                old = ITIMER_VIRTUAL;
+                new = ITIMER_REAL;
+        }
+        else {
+                old = ITIMER_REAL;
+                new = ITIMER_VIRTUAL;
+        }
+
+        if((setitimer(old, &disable, NULL) < 0) ||
+           (setitimer(new, &enable, NULL)))
+                printk("switch_timers - setitimer failed, errno = %d\n",
+                       errno);
+}
+
+void uml_idle_timer(void)
+{
+        if(signal(SIGVTALRM, SIG_IGN) == SIG_ERR)
+                panic("Couldn't unset SIGVTALRM handler");
+        
+        set_handler(SIGALRM, (__sighandler_t) alarm_handler, 
+                    SA_RESTART, SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1);
+        set_interval(ITIMER_REAL);
+}
+
+extern int do_posix_clock_monotonic_gettime(struct timespec *tp);
+
+void time_init(void)
+{
+        struct timespec now;
+
+        if(signal(SIGVTALRM, boot_timer_handler) == SIG_ERR)
+                panic("Couldn't set SIGVTALRM handler");
+        set_interval(ITIMER_VIRTUAL);
+
+        do_posix_clock_monotonic_gettime(&now);
+        wall_to_monotonic.tv_sec = -now.tv_sec;
+        wall_to_monotonic.tv_nsec = -now.tv_nsec;
+}
+
+/* Declared in linux/time.h, which can't be included here */
+extern void clock_was_set(void);
+
+void do_gettimeofday(struct timeval *tv)
+{
+        unsigned long flags;
+
+        flags = time_lock();
+        gettimeofday(tv, NULL);
+        timeradd(tv, &local_offset, tv);
+        time_unlock(flags);
+        clock_was_set();
+}
+
+int do_settimeofday(struct timespec *tv)
+{
+        struct timeval now;
+        unsigned long flags;
+        struct timeval tv_in;
+
+        if ((unsigned long) tv->tv_nsec >= UM_NSEC_PER_SEC)
+                return -EINVAL;
+
+        tv_in.tv_sec = tv->tv_sec;
+        tv_in.tv_usec = tv->tv_nsec / 1000;
+
+        flags = time_lock();
+        gettimeofday(&now, NULL);
+        timersub(&tv_in, &now, &local_offset);
+        time_unlock(flags);
+
+        return(0);
+}
+
+void idle_sleep(int secs)
+{
+        struct timespec ts;
+
+        ts.tv_sec = secs;
+        ts.tv_nsec = 0;
+        nanosleep(&ts, NULL);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */