| /* |
| * 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 */ |