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typedef struct irq_desc {
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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
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} ____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
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