1 files changed, 203 insertions, 0 deletions

diff --git a/arch/um/kernel/time_kern.c b/arch/um/kernel/time_kern.c
new file mode 100644
index 000000000000..2461cd73ca87
--- /dev/null
+++ b/arch/um/kernel/time_kern.c
@@ -0,0 +1,203 @@
+/* 
+ * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/kernel.h"
+#include "linux/module.h"
+#include "linux/unistd.h"
+#include "linux/stddef.h"
+#include "linux/spinlock.h"
+#include "linux/time.h"
+#include "linux/sched.h"
+#include "linux/interrupt.h"
+#include "linux/init.h"
+#include "linux/delay.h"
+#include "asm/irq.h"
+#include "asm/param.h"
+#include "asm/current.h"
+#include "kern_util.h"
+#include "user_util.h"
+#include "time_user.h"
+#include "mode.h"
+#include "os.h"
+
+u64 jiffies_64 = INITIAL_JIFFIES;
+
+EXPORT_SYMBOL(jiffies_64);
+
+int hz(void)
+{
+        return(HZ);
+}
+
+/*
+ * Scheduler clock - returns current time in nanosec units.
+ */
+unsigned long long sched_clock(void)
+{
+        return (unsigned long long)jiffies_64 * (1000000000 / HZ);
+}
+
+/* Changed at early boot */
+int timer_irq_inited = 0;
+
+static int first_tick;
+static unsigned long long prev_usecs;
+#ifdef CONFIG_UML_REAL_TIME_CLOCK
+static long long delta;                 /* Deviation per interval */
+#endif
+
+#define MILLION 1000000
+
+void timer_irq(union uml_pt_regs *regs)
+{
+        unsigned long long ticks = 0;
+
+        if(!timer_irq_inited){
+                /* This is to ensure that ticks don't pile up when
+                 * the timer handler is suspended */
+                first_tick = 0;
+                return;
+        }
+
+        if(first_tick){
+#ifdef CONFIG_UML_REAL_TIME_CLOCK
+                /* We've had 1 tick */
+                unsigned long long usecs = os_usecs();
+
+                delta += usecs - prev_usecs;
+                prev_usecs = usecs;
+
+                /* Protect against the host clock being set backwards */
+                if(delta < 0)
+                        delta = 0;
+
+                ticks += (delta * HZ) / MILLION;
+                delta -= (ticks * MILLION) / HZ;
+#else
+                ticks = 1;
+#endif
+        }
+        else {
+                prev_usecs = os_usecs();
+                first_tick = 1;
+        }
+
+        while(ticks > 0){
+                do_IRQ(TIMER_IRQ, regs);
+                ticks--;
+        }
+}
+
+void boot_timer_handler(int sig)
+{
+        struct pt_regs regs;
+
+        CHOOSE_MODE((void) 
+                    (UPT_SC(&regs.regs) = (struct sigcontext *) (&sig + 1)),
+                    (void) (regs.regs.skas.is_user = 0));
+        do_timer(&regs);
+}
+
+irqreturn_t um_timer(int irq, void *dev, struct pt_regs *regs)
+{
+        unsigned long flags;
+
+        do_timer(regs);
+        write_seqlock_irqsave(&xtime_lock, flags);
+        timer();
+        write_sequnlock_irqrestore(&xtime_lock, flags);
+        return(IRQ_HANDLED);
+}
+
+long um_time(int __user *tloc)
+{
+        struct timeval now;
+
+        do_gettimeofday(&now);
+        if (tloc) {
+                if (put_user(now.tv_sec, tloc))
+                        now.tv_sec = -EFAULT;
+        }
+        return now.tv_sec;
+}
+
+long um_stime(int __user *tptr)
+{
+        int value;
+        struct timespec new;
+
+        if (get_user(value, tptr))
+                return -EFAULT;
+        new.tv_sec = value;
+        new.tv_nsec = 0;
+        do_settimeofday(&new);
+        return 0;
+}
+
+void __udelay(unsigned long usecs)
+{
+        int i, n;
+
+        n = (loops_per_jiffy * HZ * usecs) / MILLION;
+        for(i=0;i<n;i++) ;
+}
+
+void __const_udelay(unsigned long usecs)
+{
+        int i, n;
+
+        n = (loops_per_jiffy * HZ * usecs) / MILLION;
+        for(i=0;i<n;i++) ;
+}
+
+void timer_handler(int sig, union uml_pt_regs *regs)
+{
+        local_irq_disable();
+        update_process_times(CHOOSE_MODE(user_context(UPT_SP(regs)), (regs)->skas.is_user));
+        local_irq_enable();
+        if(current_thread->cpu == 0)
+                timer_irq(regs);
+}
+
+static DEFINE_SPINLOCK(timer_spinlock);
+
+unsigned long time_lock(void)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&timer_spinlock, flags);
+        return(flags);
+}
+
+void time_unlock(unsigned long flags)
+{
+        spin_unlock_irqrestore(&timer_spinlock, flags);
+}
+
+int __init timer_init(void)
+{
+        int err;
+
+        CHOOSE_MODE(user_time_init_tt(), user_time_init_skas());
+        err = request_irq(TIMER_IRQ, um_timer, SA_INTERRUPT, "timer", NULL);
+        if(err != 0)
+                printk(KERN_ERR "timer_init : request_irq failed - "
+                       "errno = %d\n", -err);
+        timer_irq_inited = 1;
+        return(0);
+}
+
+__initcall(timer_init);
+
+/*
+ * 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:
+ */