ARM 嵌入式 系统 设计与实例开发 实验教材 二源码

				/*				 *  include/asm-s390/hardirq.h				 *				 *  S390 version				 *    Copyright (C) 1999 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 				#include 				#include 				#include 								/* entry.S is sensitive to the offsets of these fields */				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 	/* 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 hardirq_enter(cpu)	(local_irq_count(cpu)++)				#define hardirq_exit(cpu)	(local_irq_count(cpu)--)								#define synchronize_irq()	do { } while (0)								#else								#include 				#include 								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);				                atomic_set(&global_irq_lock,0);					}				}								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) && 				               !atomic_read(&global_irq_lock);				}								#define hardirq_endlock(cpu)	do { } while (0)								extern void synchronize_irq(void);								#endif /* CONFIG_SMP */								#endif /* __ASM_HARDIRQ_H */