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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [include/] [asm-mips64/] [hardirq.h] - Rev 1275
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/* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 1997 - 2000, 2001 by Ralf Baechle * Copyright (C) 1999, 2000 Silicon Graphics, Inc. * Copyright (C) 2001 MIPS Technologies, Inc. */ #ifndef _ASM_HARDIRQ_H #define _ASM_HARDIRQ_H #include <linux/config.h> #include <linux/threads.h> #include <linux/irq.h> typedef struct { unsigned int __softirq_pending; unsigned int __local_irq_count; unsigned int __local_bh_count; unsigned int __syscall_count; struct task_struct * __ksoftirqd_task; /* waitqueue is too large */ } ____cacheline_aligned irq_cpustat_t; #include <linux/irq_cpustat.h> /* Standard mappings for irq_cpustat_t above */ /* * Are we in an interrupt context? Either doing bottom half * or hardware interrupt processing? */ #define in_interrupt() ({ int __cpu = smp_processor_id(); \ (local_irq_count(__cpu) + local_bh_count(__cpu) != 0); }) #define in_irq() (local_irq_count(smp_processor_id()) != 0) #ifndef CONFIG_SMP #define hardirq_trylock(cpu) (local_irq_count(cpu) == 0) #define hardirq_endlock(cpu) do { } while (0) #define irq_enter(cpu, irq) (local_irq_count(cpu)++) #define irq_exit(cpu, irq) (local_irq_count(cpu)--) #define synchronize_irq() barrier(); #else #include <asm/atomic.h> #include <linux/spinlock.h> #include <asm/smp.h> extern int global_irq_holder; extern spinlock_t global_irq_lock; static inline int irqs_running (void) { int i; for (i = 0; i < smp_num_cpus; i++) if (local_irq_count(i)) return 1; return 0; } static inline void release_irqlock(int cpu) { /* if we didn't own the irq lock, just ignore.. */ if (global_irq_holder == cpu) { global_irq_holder = NO_PROC_ID; spin_unlock(&global_irq_lock); } } static inline int hardirq_trylock(int cpu) { return !local_irq_count(cpu) && !spin_is_locked(&global_irq_lock); } #define hardirq_endlock(cpu) do { } while (0) static inline void irq_enter(int cpu, int irq) { ++local_irq_count(cpu); while (spin_is_locked(&global_irq_lock)) barrier(); } static inline void irq_exit(int cpu, int irq) { --local_irq_count(cpu); } extern void synchronize_irq(void); #endif /* CONFIG_SMP */ #endif /* _ASM_HARDIRQ_H */
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