linux 2.6.16.38 w/ vs2.0.3-rc1

[linux-2.6.git] / arch / ia64 / kernel / time.c

diff --git a/arch/ia64/kernel/time.c b/arch/ia64/kernel/time.c
index 8b8a5a4..307d01e 100644 (file)
--- a/arch/ia64/kernel/time.c
+++ b/arch/ia64/kernel/time.c
@@ -32,10 +32,6 @@
 
 extern unsigned long wall_jiffies;
 
-u64 jiffies_64 __cacheline_aligned_in_smp = INITIAL_JIFFIES;
-
-EXPORT_SYMBOL(jiffies_64);
-
 #define TIME_KEEPER_ID 0       /* smp_processor_id() of time-keeper */
 
 #ifdef CONFIG_IA64_DEBUG_IRQ
@@ -253,3 +249,54 @@ time_init (void)
         */
        set_normalized_timespec(&wall_to_monotonic, -xtime.tv_sec, -xtime.tv_nsec);
 }
+
+/*
+ * Generic udelay assumes that if preemption is allowed and the thread
+ * migrates to another CPU, that the ITC values are synchronized across
+ * all CPUs.
+ */
+static void
+ia64_itc_udelay (unsigned long usecs)
+{
+       unsigned long start = ia64_get_itc();
+       unsigned long end = start + usecs*local_cpu_data->cyc_per_usec;
+
+       while (time_before(ia64_get_itc(), end))
+               cpu_relax();
+}
+
+void (*ia64_udelay)(unsigned long usecs) = &ia64_itc_udelay;
+
+void
+udelay (unsigned long usecs)
+{
+       (*ia64_udelay)(usecs);
+}
+EXPORT_SYMBOL(udelay);
+
+static unsigned long long ia64_itc_printk_clock(void)
+{
+       if (ia64_get_kr(IA64_KR_PER_CPU_DATA))
+               return sched_clock();
+       return 0;
+}
+
+static unsigned long long ia64_default_printk_clock(void)
+{
+       return (unsigned long long)(jiffies_64 - INITIAL_JIFFIES) *
+               (1000000000/HZ);
+}
+
+unsigned long long (*ia64_printk_clock)(void) = &ia64_default_printk_clock;
+
+unsigned long long printk_clock(void)
+{
+       return ia64_printk_clock();
+}
+
+void __init
+ia64_setup_printk_clock(void)
+{
+       if (!(sal_platform_features & IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT))
+               ia64_printk_clock = ia64_itc_printk_clock;
+}