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/*
* 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/config.h>
#include <linux/threads.h>
#include <asm/lowcore.h>
#include <linux/sched.h>
/* No irq_cpustat_t for s390, the data is held directly in S390_lowcore */
/*
* Simple wrappers reducing source bloat. S390 specific because each
* cpu stores its data in S390_lowcore (PSA) instead of using a cache
* aligned array element like most architectures.
*/
#ifdef CONFIG_SMP
#define softirq_active(cpu) (safe_get_cpu_lowcore(cpu).__softirq_active)
#define softirq_mask(cpu) (safe_get_cpu_lowcore(cpu).__softirq_mask)
#define local_irq_count(cpu) (safe_get_cpu_lowcore(cpu).__local_irq_count)
#define local_bh_count(cpu) (safe_get_cpu_lowcore(cpu).__local_bh_count)
#define syscall_count(cpu) (safe_get_cpu_lowcore(cpu).__syscall_count)
#else /* CONFIG_SMP */
/* Optimize away the cpu calculation, it is always current PSA */
#define softirq_active(cpu) ((void)(cpu), S390_lowcore.__softirq_active)
#define softirq_mask(cpu) ((void)(cpu), S390_lowcore.__softirq_mask)
#define local_irq_count(cpu) ((void)(cpu), S390_lowcore.__local_irq_count)
#define local_bh_count(cpu) ((void)(cpu), S390_lowcore.__local_bh_count)
#define syscall_count(cpu) ((void)(cpu), S390_lowcore.__syscall_count)
#endif /* CONFIG_SMP */
/*
* Are we in an interrupt context? Either doing bottom half
* or hardware interrupt processing?
* Special definitions for s390, always access current PSA.
*/
#define in_interrupt() ((S390_lowcore.__local_irq_count + S390_lowcore.__local_bh_count) != 0)
#define in_irq() (S390_lowcore.__local_irq_count != 0)
#ifndef CONFIG_SMP
#define hardirq_trylock(cpu) (local_irq_count(cpu) == 0)
#define hardirq_endlock(cpu) do { } while (0)
#define hardirq_enter(cpu) (local_irq_count(cpu)++)
#define hardirq_exit(cpu) (local_irq_count(cpu)--)
#define synchronize_irq() do { } while (0)
#else
#include <asm/atomic.h>
#include <asm/smp.h>
extern atomic_t global_irq_holder;
extern atomic_t global_irq_lock;
extern atomic_t global_irq_count;
static inline void release_irqlock(int cpu)
{
/* if we didn't own the irq lock, just ignore.. */
if (atomic_read(&global_irq_holder) == cpu) {
atomic_set(&global_irq_holder,NO_PROC_ID);
clear_bit(0,&global_irq_lock);
}
}
static inline void hardirq_enter(int cpu)
{
++local_irq_count(cpu);
atomic_inc(&global_irq_count);
}
static inline void hardirq_exit(int cpu)
{
atomic_dec(&global_irq_count);
--local_irq_count(cpu);
}
static inline int hardirq_trylock(int cpu)
{
return !atomic_read(&global_irq_count) && !test_bit(0,&global_irq_lock);
}
#define hardirq_endlock(cpu) do { } while (0)
extern void synchronize_irq(void);
#endif /* CONFIG_SMP */
#endif /* __ASM_HARDIRQ_H */
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