98 lines
2.3 KiB
C
Executable File
98 lines
2.3 KiB
C
Executable File
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1997, 1998, 1999, 2000, 2001 by Ralf Baechle
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
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* Copyright (C) 2001 MIPS Technologies, Inc.
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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/config.h>
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#include <linux/threads.h>
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#include <linux/irq.h>
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#include <linux/spinlock.h>
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typedef struct {
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unsigned int __softirq_pending;
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unsigned int __local_irq_count;
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unsigned int __local_bh_count;
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unsigned int __syscall_count;
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struct task_struct * __ksoftirqd_task; /* waitqueue is too large */
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} ____cacheline_aligned irq_cpustat_t;
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#include <linux/irq_cpustat.h> /* Standard mappings for irq_cpustat_t above */
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/*
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* Are we in an interrupt context? Either doing bottom half
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* or hardware interrupt processing?
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*/
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#define in_interrupt() ({ int __cpu = smp_processor_id(); \
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(local_irq_count(__cpu) + local_bh_count(__cpu) != 0); })
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#define in_irq() (local_irq_count(smp_processor_id()) != 0)
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#ifndef CONFIG_SMP
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#define hardirq_trylock(cpu) (local_irq_count(cpu) == 0)
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#define hardirq_endlock(cpu) do { } while (0)
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#define irq_enter(cpu, irq) (local_irq_count(cpu)++)
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#define irq_exit(cpu, irq) (local_irq_count(cpu)--)
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#define synchronize_irq() barrier();
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#else
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#include <asm/atomic.h>
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#include <linux/spinlock.h>
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#include <asm/smp.h>
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extern int global_irq_holder;
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extern spinlock_t global_irq_lock;
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static inline int irqs_running (void)
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{
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int i;
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for (i = 0; i < smp_num_cpus; i++)
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if (local_irq_count(i))
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return 1;
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return 0;
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}
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static inline void release_irqlock(int cpu)
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{
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/* if we didn't own the irq lock, just ignore.. */
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if (global_irq_holder == cpu) {
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global_irq_holder = NO_PROC_ID;
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spin_unlock(&global_irq_lock);
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}
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}
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static inline int hardirq_trylock(int cpu)
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{
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return !local_irq_count(cpu) && !spin_is_locked(&global_irq_lock);
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}
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#define hardirq_endlock(cpu) do { } while (0)
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static inline void irq_enter(int cpu, int irq)
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{
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++local_irq_count(cpu);
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while (spin_is_locked(&global_irq_lock))
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barrier();
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}
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static inline void irq_exit(int cpu, int irq)
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{
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--local_irq_count(cpu);
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}
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extern void synchronize_irq(void);
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#endif /* CONFIG_SMP */
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#endif /* _ASM_HARDIRQ_H */
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