[PATCH] uml: move libc-dependent time code

The serial UML OS-abstraction layer patch (um/kernel dir).

This moves all systemcalls from time.c file under os-Linux dir and joins
time.c and tine_kernel.c files

Signed-off-by: Gennady Sharapov <Gennady.V.Sharapov@intel.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 76 insertions, 48 deletions

diff --git a/arch/um/kernel/time_kern.c b/arch/um/kernel/time_kern.c
index 020ca79b8d33..6712ffad0242 100644
--- a/arch/um/kernel/time_kern.c
+++ b/arch/um/kernel/time_kern.c
@@ -1,4 +1,4 @@
-/* 
+/*
  * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
  * Licensed under the GPL
  */
@@ -13,12 +13,12 @@
 #include "linux/interrupt.h"
 #include "linux/init.h"
 #include "linux/delay.h"
+#include "linux/hrtimer.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"
 
@@ -39,7 +39,7 @@ unsigned long long sched_clock(void)
 int timer_irq_inited = 0;
 
 static int first_tick;
-static unsigned long long prev_usecs;
+static unsigned long long prev_nsecs;
 #ifdef CONFIG_UML_REAL_TIME_CLOCK
 static long long delta;   		/* Deviation per interval */
 #endif
@@ -58,23 +58,23 @@ void timer_irq(union uml_pt_regs *regs)
 	if(first_tick){
 #ifdef CONFIG_UML_REAL_TIME_CLOCK
 		/* We've had 1 tick */
-		unsigned long long usecs = os_usecs();
+		unsigned long long nsecs = os_nsecs();
 
-		delta += usecs - prev_usecs;
-		prev_usecs = usecs;
+		delta += nsecs - prev_nsecs;
+		prev_nsecs = nsecs;
 
 		/* Protect against the host clock being set backwards */
 		if(delta < 0)
 			delta = 0;
 
-		ticks += (delta * HZ) / MILLION;
-		delta -= (ticks * MILLION) / HZ;
+		ticks += (delta * HZ) / BILLION;
+		delta -= (ticks * BILLION) / HZ;
 #else
 		ticks = 1;
 #endif
 	}
 	else {
-		prev_usecs = os_usecs();
+		prev_nsecs = os_nsecs();
 		first_tick = 1;
 	}
 
@@ -88,45 +88,99 @@ void boot_timer_handler(int sig)
 {
 	struct pt_regs regs;
 
-	CHOOSE_MODE((void) 
+	CHOOSE_MODE((void)
 		    (UPT_SC(&regs.regs) = (struct sigcontext *) (&sig + 1)),
 		    (void) (regs.regs.skas.is_user = 0));
 	do_timer(&regs);
 }
 
+static DEFINE_SPINLOCK(timer_spinlock);
+
+static unsigned long long local_offset = 0;
+
+static inline unsigned long long get_time(void)
+{
+	unsigned long long nsecs;
+	unsigned long flags;
+
+	spin_lock_irqsave(&timer_spinlock, flags);
+	nsecs = os_nsecs();
+	nsecs += local_offset;
+	spin_unlock_irqrestore(&timer_spinlock, flags);
+
+	return nsecs;
+}
+
 irqreturn_t um_timer(int irq, void *dev, struct pt_regs *regs)
 {
+	unsigned long long nsecs;
 	unsigned long flags;
 
 	do_timer(regs);
+
 	write_seqlock_irqsave(&xtime_lock, flags);
-	timer();
+	nsecs = get_time() + local_offset;
+	xtime.tv_sec = nsecs / NSEC_PER_SEC;
+	xtime.tv_nsec = nsecs - xtime.tv_sec * NSEC_PER_SEC;
 	write_sequnlock_irqrestore(&xtime_lock, flags);
+
 	return(IRQ_HANDLED);
 }
 
 long um_time(int __user *tloc)
 {
-	struct timeval now;
+	long ret = get_time() / NSEC_PER_SEC;
 
-	do_gettimeofday(&now);
-	if (tloc) {
- 		if (put_user(now.tv_sec, tloc))
-			now.tv_sec = -EFAULT;
-	}
-	return now.tv_sec;
+	if((tloc != NULL) && put_user(ret, tloc))
+		return -EFAULT;
+
+	return ret;
+}
+
+void do_gettimeofday(struct timeval *tv)
+{
+	unsigned long long nsecs = get_time();
+
+	tv->tv_sec = nsecs / NSEC_PER_SEC;
+	/* Careful about calculations here - this was originally done as
+	 * (nsecs - tv->tv_sec * NSEC_PER_SEC) / NSEC_PER_USEC
+	 * which gave bogus (> 1000000) values.  Dunno why, suspect gcc
+	 * (4.0.0) miscompiled it, or there's a subtle 64/32-bit conversion
+	 * problem that I missed.
+	 */
+	nsecs -= tv->tv_sec * NSEC_PER_SEC;
+	tv->tv_usec = (unsigned long) nsecs / NSEC_PER_USEC;
+}
+
+static inline void set_time(unsigned long long nsecs)
+{
+	unsigned long long now;
+	unsigned long flags;
+
+	spin_lock_irqsave(&timer_spinlock, flags);
+	now = os_nsecs();
+	local_offset = nsecs - now;
+	spin_unlock_irqrestore(&timer_spinlock, flags);
+
+	clock_was_set();
 }
 
 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);
+
+	set_time((unsigned long long) value * NSEC_PER_SEC);
+
+	return 0;
+}
+
+int do_settimeofday(struct timespec *tv)
+{
+	set_time((unsigned long long) tv->tv_sec * NSEC_PER_SEC + tv->tv_nsec);
+
 	return 0;
 }
 
@@ -142,21 +196,6 @@ void timer_handler(int sig, union uml_pt_regs *regs)
 		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;
@@ -171,14 +210,3 @@ int __init timer_init(void)
 }
 
 __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:
- */