litmus-rt.git - The LITMUS^RT kernel.

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The LITMUS^RT kernel.

Bjoern Brandenburg

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path: root/drivers/iommu/iommu-sysfs.c

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an> cycle_t jiffies_read(struct clocksource *cs) { return (cycle_t) jiffies; } static struct clocksource clocksource_jiffies = { .name = "jiffies", .rating = 1, /* lowest valid rating*/ .read = jiffies_read, .mask = 0xffffffff, /*32bits*/ .mult = NSEC_PER_JIFFY << JIFFIES_SHIFT, /* details above */ .shift = JIFFIES_SHIFT, }; __cacheline_aligned_in_smp DEFINE_SEQLOCK(jiffies_lock); #if (BITS_PER_LONG < 64) u64 get_jiffies_64(void) { unsigned long seq; u64 ret; do { seq = read_seqbegin(&jiffies_lock); ret = jiffies_64; } while (read_seqretry(&jiffies_lock, seq)); return ret; } EXPORT_SYMBOL(get_jiffies_64); #endif EXPORT_SYMBOL(jiffies); static int __init init_jiffies_clocksource(void) { return clocksource_register(&clocksource_jiffies); } core_initcall(init_jiffies_clocksource); struct clocksource * __init __weak clocksource_default_clock(void) { return &clocksource_jiffies; } struct clocksource refined_jiffies; int register_refined_jiffies(long cycles_per_second) { u64 nsec_per_tick, shift_hz; long cycles_per_tick; refined_jiffies = clocksource_jiffies; refined_jiffies.name = "refined-jiffies"; refined_jiffies.rating++; /* Calc cycles per tick */ cycles_per_tick = (cycles_per_second + HZ/2)/HZ; /* shift_hz stores hz<<8 for extra accuracy */ shift_hz = (u64)cycles_per_second << 8; shift_hz += cycles_per_tick/2; do_div(shift_hz, cycles_per_tick); /* Calculate nsec_per_tick using shift_hz */ nsec_per_tick = (u64)NSEC_PER_SEC << 8; nsec_per_tick += (u32)shift_hz/2; do_div(nsec_per_tick, (u32)shift_hz); refined_jiffies.mult = ((u32)nsec_per_tick) << JIFFIES_SHIFT; clocksource_register(&refined_jiffies); return 0; }


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