Messages in this thread |  | | | Date | Wed, 8 Jun 2005 21:38:04 -0400 | | From | Jon Smirl <> | | Subject | Re: Dell BIOS and HPET timer support |
On 6/8/05, Lee Revell <rlrevell@joe-job.com> wrote: > Check the source, it's self-explanatory. See hpet_alloc().
What is going on with do_div()? 0x0429b17f /100000 = 69.8 in my caculator. It comes back as 0 from do_div(). [jonsmirl@jonsmirl ~]$ dmesg | grep HPET HPET: cap 0429b17f8086a201 period 0429b17f HPET: period 0429b17f ns 0429b17f HPET: period 0429b17f ns 00000000 Using HPET for base-timer Using HPET for gettimeofday [jonsmirl@jonsmirl ~]$
hpetp->hp_period = (cap & HPET_COUNTER_CLK_PERIOD_MASK) >> HPET_COUNTER_CLK_PERIOD_SHIFT; printk(KERN_ERR "HPET: cap %016llx period %08lx\n", cap, hpetp->hp_period);
ns = hpetp->hp_period; /* femptoseconds, 10^-15 */ printk(KERN_ERR "HPET: period %08lx ns %08lx \n", hpetp->hp_period, ns); do_div(ns, 1000000); /* convert to nanoseconds, 10^-9 */ printk(KERN_ERR "HPET: period %08lx ns %08lx \n", hpetp->hp_period, ns); printk(KERN_INFO "hpet%d: %ldns tick, %d %d-bit timers\n", hpetp->hp_which, ns, hpetp->hp_ntimer, cap & HPET_COUNTER_SIZE_MASK ? 64 : 32); -- Jon Smirl jonsmirl@gmail.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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