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d54853ef8c
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>
37 lines
931 B
C
37 lines
931 B
C
/*
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* include/asm-s390/hardirq.h
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*
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* S390 version
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* Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
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* Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
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*
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* Derived from "include/asm-i386/hardirq.h"
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*/
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#ifndef __ASM_HARDIRQ_H
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#define __ASM_HARDIRQ_H
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#include <linux/threads.h>
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#include <linux/sched.h>
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#include <linux/cache.h>
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#include <linux/interrupt.h>
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#include <asm/lowcore.h>
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/* irq_cpustat_t is unused currently, but could be converted
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* into a percpu variable instead of storing softirq_pending
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* on the lowcore */
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typedef struct {
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unsigned int __softirq_pending;
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} irq_cpustat_t;
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#define local_softirq_pending() (S390_lowcore.softirq_pending)
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#define __ARCH_IRQ_STAT
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#define __ARCH_HAS_DO_SOFTIRQ
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#define HARDIRQ_BITS 8
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extern void account_ticks(u64 time);
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#endif /* __ASM_HARDIRQ_H */
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