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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2007-02-05 15:18:19 -0500
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2007-02-05 15:18:19 -0500
commitd54853ef8cb17296ac7bce9c77430fb7c80532d0 (patch)
tree649e14d532e17231225a042a7c9a3d9207ad91ee /include/asm-s390/hardirq.h
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 'include/asm-s390/hardirq.h')
-rw-r--r--include/asm-s390/hardirq.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/asm-s390/hardirq.h b/include/asm-s390/hardirq.h
index c2f6a8782d31..31beb18cb3d1 100644
--- a/include/asm-s390/hardirq.h
+++ b/include/asm-s390/hardirq.h
@@ -32,6 +32,6 @@ typedef struct {
32 32
33#define HARDIRQ_BITS 8 33#define HARDIRQ_BITS 8
34 34
35extern void account_ticks(void); 35extern void account_ticks(u64 time);
36 36
37#endif /* __ASM_HARDIRQ_H */ 37#endif /* __ASM_HARDIRQ_H */