linux/include/asm-s390/hardirq.h
Martin Schwidefsky d54853ef8c [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>
2007-02-05 21:18:19 +01:00

38 lines
931 B
C

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