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typedef struct irq_desc {
        hw_irq_controller *handler;Ö¸Ïòpic¶ÔÏó£¨hw_irq_controllerÃèÊö·û£©£¬·þÎñÓÚirqÏß
        void *handler_data;Ö¸Ïòpic·½·¨ËùʹÓõÄÊý¾Ý
        struct irqaction *action;       /* IRQ action list */±êʶµ±³öÏÖirqʱҪµ÷ÓõÄÖжϷþÎñÀý³Ì¡£¸Ã×Ö¶ÎÖ¸ÏòirqµÄirqactionÃèÊö·ûÁ´±íµÄµÚÒ»¸öÔªËØ¡£
        unsigned int status;            /* IRQ status */ÃèÊöirqÏß״̬µÄÒ»×é±êÖ¾
        unsigned int depth;             /* nested irq disables */Èç¹ûirqÏß±»¼¤»î£¬ÔòÏÔʾ0£»Èç¹ûirqÏß±»½ûÖ¹Á˲»Ö¹Ò»´Î£¬ÔòÏÔʾһ¸öÕýÊý
        unsigned int irq_count;         /* For detecting broken interrupts */ÖжϼÆÊýÆ÷£¬Í³¼ÆirqÏßÉÏ·¢ÉúµÄÖжϼÆÊý
        unsigned int irqs_unhandled;ÖжϼÆÊýÆ÷£¬Í³¼ÆirqÏßÉÏ·¢ÉúµÄÎÞ·¨´¦ÀíµÄÖжϽøÐмÆÊý
        spinlock_t lock;ÓÃÓÚ´®ÐзÃÎÊirqÃèÊö·ûºÍpicµÄ×ÔÐýËø¡£
} ____cacheline_aligned irq_desc_t;
extern irq_desc_t irq_desc [NR_IRQS];
/*
 * IRQ line status.
 */
#define IRQ_INPROGRESS  1       /* IRQ handler active - do not enter! */IRQµÄÒ»¸ö´¦Àí³ÌÐòÕýÔÚÖ´ÐÐ
#define IRQ_DISABLED    2       /* IRQ disabled - do not enter! */ÓÉÒ»¸öÉ豸Çý¶¯³ÌÐò¹ÊÒâµØ½ûÓÃirqÏß
#define IRQ_PENDING     4       /* IRQ pending - replay on enable */Ò»¸öirqÒѾ­³öÏÖÔÚÏßÉÏ£¬ËüµÄ³öÏÖÒ²ÒѶÔpic×ö³öÓ¦´ð£¬µ«ÊÇÄں˻¹Ã»ÓÐΪËüÌṩ·þÎñ
#define IRQ_REPLAY      8 &nbs


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