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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2007-02-05 21:18:19 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2007-02-05 21:18:19 +0100
commitd54853ef8cb17296ac7bce9c77430fb7c80532d0 (patch)
tree649e14d532e17231225a042a7c9a3d9207ad91ee /drivers/s390/s390_rdev.c
parentc1821c2e9711adc3cd298a16b7237c92a2cee78d (diff)
[S390] ETR support.
This patch adds support for clock synchronization to an external time reference (ETR). The external time reference sends an oscillator signal and a synchronization signal every 2^20 microseconds to keep the TOD clocks of all connected servers in sync. For availability two ETR units can be connected to a machine. If the clock deviates for more than the sync-check tolerance all cpus get a machine check that indicates that the clock is out of sync. For the lovely details how to get the clock back in sync see the code below. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/s390_rdev.c')
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