{"id":1618,"date":"2010-10-06T17:14:37","date_gmt":"2010-10-06T09:14:37","guid":{"rendered":"http:\/\/edsionte.com\/techblog\/?p=1618"},"modified":"2011-11-03T10:39:51","modified_gmt":"2011-11-03T02:39:51","slug":"%e4%b8%ad%e6%96%ad%e5%a4%84%e7%90%86%e6%9c%ba%e5%88%b6%e7%9a%84%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"http:\/\/edsionte.com\/techblog\/archives\/1618","title":{"rendered":"\u4e0e\u4e2d\u65ad\u6709\u5173\u7684\u6570\u636e\u7ed3\u6784"},"content":{"rendered":"<p><strong><em><span style=\"color: #ff0000;\">Latest Update:2010\/10\/12<\/span><\/em><\/strong><\/p>\n<h3>1.\u6982\u8ff0<\/h3>\n<p>\u901a\u8fc7\u524d\u6587\uff0c\u6211\u4eec\u5df2\u7ecf\u77e5\u9053\u4e86\u4e2d\u65ad\u901a\u5e38\u7531\u4e0a\u4e0b\u4e24\u90e8\u5206\u7ec4\u6210\u3002\u5728\u4e0a\u90e8\u5206\uff0c\u4e5f\u5c31\u662f\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\uff0c\u5b8c\u6210\u4e2d\u65ad\u8bf7\u6c42\u7684\u54cd\u5e94\u4ee5\u53ca\u5b8c\u6210\u90a3\u4e9b\u5bf9\u65f6\u95f4\u8981\u6c42\u7d27\u8feb\u7684\u5de5\u4f5c\uff1b\u800c\u5728\u4e0b\u90e8\u5206\uff0c\u901a\u5e38\u5b8c\u6210\u90a3\u4e9b\u88ab\u63a8\u540e\u7684\u5de5\u4f5c\uff0c\u56e0\u4e3a\u8fd9\u90e8\u5206\u5de5\u4f5c\u5bf9\u65f6\u95f4\u7684\u8981\u6c42\u76f8\u5bf9\u5bbd\u677e\u4e00\u4e9b\u3002\u901a\u8fc7\u4e86\u89e3\u4e0a\u4e0b\u4e24\u90e8\u5206\u7684\u5de5\u4f5c\u60c5\u51b5\uff0c\u53ef\u4ee5\u66f4\u597d\u7684\u7406\u89e3\u4e2d\u65ad\u8fd9\u4e2a\u6982\u5ff5\u3002\u4ece\u4e0b\u534a\u90e8\u5206\u6267\u884c\u673a\u5236\u6765\u770b\u2014\u2014\u4e0d\u7ba1\u662ftasklet\u8fd8\u662f\u5de5\u4f5c\u961f\u5217\u2014\u2014\u8fd9\u4e9b\u63a8\u540e\u7684\u5de5\u4f5c\u603b\u662f\u5728\u4e0a\u534a\u90e8\u5206\u88ab\u8c03\u7528\uff0c\u7136\u540e\u4ea4\u7ed9\u5185\u6838\u5728\u9002\u5f53\u7684\u65f6\u95f4\u6765\u5b8c\u6210\u3002\u90a3\u4e48\uff0c\u4e2d\u65ad\u4e0a\u90e8\u5206\u5177\u4f53\u662f\u5982\u4f55\u5de5\u4f5c\u7684\uff1f\u5185\u6838\u5bf9\u4e2d\u65ad\u662f\u5982\u4f55\u5904\u7406\u7684\uff1f<\/p>\n<p>\u5728\u5f00\u59cb\u5206\u6790\u4e4b\u524d\uff0c\u9700\u8981\u8bf4\u660e\u7684\u662f\u63a5\u4e0b\u6765\u5206\u6790\u7684\u5c5e\u4e8e\u5185\u6838\u5bf9\u5916\u8bbe\u4ea7\u751f\u7684\u4e2d\u65ad\u7684\u5904\u7406\u60c5\u51b5\uff0c\u5f02\u5e38\u7684\u5904\u7406\u8fc7\u7a0b\u5728\u672c\u6587\u7684\u6700\u540e\u4f1a\u6709\u7b80\u5355\u89e3\u91ca\u3002<\/p>\n<p>\u6240\u6709\u7684\u4e2d\u65ad\u7684\u5904\u7406\u7a0b\u5e8f\u5728init_IRQ\u51fd\u6570\u4e2d\u90fd\u88ab\u521d\u59cb\u5316\u4e3ainterrupt[i]\u3002interrupt\u6570\u7ec4\u4e2d\u6bcf\u4e00\u9879\u5747\u6307\u5411\u4e00\u4e2a\u4ee3\u7801\u7247\u6bb5\uff1a<\/p>\n<pre class=\"brush:c\">pushl $n-256\r\n\/*\u7701\u7565\u90e8\u5206\u4ee3\u7801*\/\r\njmp common_interrupt<\/pre>\n<p>\u8be5\u4ee3\u7801\u7247\u6bb5\u9664\u4e86\u5c06\u4e2d\u65ad\u5411\u91cf\u53f7\u538b\u5165\u5806\u6808\uff0c\u8fd8\u4f1a\u8df3\u5230\u4e00\u4e2a\u516c\u5171\u5904\u7406\u7a0b\u5e8fcommon_interrup\uff1a<\/p>\n<pre class=\"brush:c\">\/\/\u5728linux\/arch\/x86\/kernel\/entry_32.S\r\n 863 common_interrupt:\r\n 864         addl $-0x80,(%esp)      \/* Adjust vector into the [-256,-1] range *     \/\r\n 865         SAVE_ALL\r\n 866         TRACE_IRQS_OFF\r\n 867         movl %esp,%eax\r\n 868         call do_IRQ\r\n 869         jmp ret_from_intr<\/pre>\n<p>\u8fd9\u6bb5\u516c\u5171\u5904\u7406\u7a0b\u5e8f\u4f1a\u5c06\u4e2d\u65ad\u53d1\u751f\u524d\u7684\u6240\u6709\u5bc4\u5b58\u5668\u7684\u503c\u538b\u5165\u5806\u6808\uff0c\u4e5f\u5c31\u662f\u4fdd\u5b58\u88ab\u4e2d\u65ad\u4efb\u52a1\u7684\u73b0\u573a\u3002\u7136\u540e\u8c03\u7528do_IRQ\u51fd\u6570\uff0c\u5728do_IRQ\u51fd\u6570\u4e2d\u4f1a\u8c03\u7528\uff08\u5e76\u975e\u76f4\u63a5\u8c03\u7528\u90a3\u4e48\u7b80\u5355\uff09\u5230handle_IRQ_event\u51fd\u6570\uff0c\u5728\u6b64\u51fd\u6570\u4e2d\u4f1a\u6267\u884c\u5b9e\u9645\u7684\u4e2d\u65ad\u670d\u52a1\u4f8b\u7a0b\u3002\u5f53\u4e2d\u65ad\u670d\u52a1\u4f8b\u7a0b\u6267\u884c\u5b8c\u6bd5\u540e\uff0c\u4f1a\u8fd4\u56de\u5230\u4e0a\u9762\u7684\u90a3\u6bb5\u6c47\u7f16\u7a0b\u5e8f\u4e2d\uff0c\u8f6c\u5165ret_from_intr\u4ee3\u7801\u6bb5\u4ece\u4e2d\u65ad\u8fd4\u56de\u3002<\/p>\n<p>\u5728\u4e0a\u8ff0\u6587\u5b57\u63cf\u8ff0\u7684\u57fa\u7840\u4e0a\uff0c\u53ef\u4ee5\u901a\u8fc7\u4e0b\u56fe\u8fdb\u4e00\u6b65\u52a0\u6df1\u4e2d\u65ad\u7684\u5904\u7406\u8fc7\u7a0b\uff1a<br \/>\n<a href=\"http:\/\/edsionte.com\/techblog\/archives\/1618\/interrupt4\" rel=\"attachment wp-att-1637\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1637\" title=\"interrupt4\" src=\"http:\/\/edsionte.com\/techblog\/wordpress\/wp-content\/uploads\/2010\/10\/interrupt4.jpg\" alt=\"\" width=\"582\" height=\"310\" srcset=\"http:\/\/edsionte.com\/techblog\/wordpress\/wp-content\/uploads\/2010\/10\/interrupt4.jpg 582w, http:\/\/edsionte.com\/techblog\/wordpress\/wp-content\/uploads\/2010\/10\/interrupt4-300x159.jpg 300w\" sizes=\"auto, (max-width: 582px) 100vw, 582px\" \/><\/a><\/p>\n<p>\u4ece\u4e0a\u9762\u7684\u6982\u8ff0\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u5f88\u5feb\u5b9a\u4f4d\u6211\u4eec\u672a\u6765\u8981\u5206\u6790\u7684\u51fd\u6570\uff1ado_IRQ()\u548chand_IRQ_event()\uff1b\u5728\u5206\u6790\u4e0a\u8ff0\u51fd\u6570\u4e4b\u524d\uff0c\u6211\u4eec\u5f88\u6709\u5fc5\u8981\u5148\u5206\u6790\u4e00\u4e0b\u5173\u4e8e\u4e2d\u65ad\u7684\u4e09\u4e2a\u91cd\u8981\u7684\u6570\u636e\u7ed3\u6784\u3002<\/p>\n<h3>2.struct irq_desc<\/h3>\n<p>\u5728\u4e00\u5f00\u59cb\u6211\u4eec\u5206\u6790\u4e2d\u65ad\u7684\u65f6\u5019\uff0c\u8c08\u53ca\u5230\u4e86\u4e2d\u65ad\u5411\u91cf\u3002\u5728\u5185\u6838\u4e2d\uff0c\u6bcf\u4e2a\u4e2d\u65ad\u5411\u91cf\u90fd\u6709\u76f8\u5e94\u7684\u6709\u4e00\u4e2airq_desc\u7ed3\u6784\u4f53\uff08\u7a0d\u65e9\u5185\u6838\u7248\u672c\u4e2d\u4e3airq_desc_t\uff09\u6765\u63cf\u8ff0\u4e00\u4e2a\u4e2d\u65ad\u5411\u91cf\uff08\u4e5f\u5c31\u662f\u4e2d\u65ad\u6e90\uff09\uff0c\u5177\u4f53\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre class=\"brush:c\">  31struct irq_desc;\r\n  32typedef void (*irq_flow_handler_t)(unsigned int irq,\r\n  33                                            struct irq_desc *desc);\r\n\r\n 175struct irq_desc {\r\n 176        unsigned int            irq;\r\n 177        struct timer_rand_state *timer_rand_state;\r\n 178        unsigned int            *kstat_irqs;\r\n 179#ifdef CONFIG_INTR_REMAP\r\n 180        struct irq_2_iommu      *irq_2_iommu;\r\n 181#endif\r\n 182        irq_flow_handler_t      handle_irq;\r\n 183        struct irq_chip         *chip;\r\n 184        struct msi_desc         *msi_desc;\r\n 185        void                    *handler_data;\r\n 186        void                    *chip_data;\r\n 187        struct irqaction        *action;\r\n 188        unsigned int            status;\r\n 189\r\n 190        unsigned int            depth;\r\n 191        unsigned int            wake_depth;\r\n 192        unsigned int            irq_count;\r\n 193        unsigned long           last_unhandled;\r\n 194        unsigned int            irqs_unhandled;\r\n 195        raw_spinlock_t          lock;\r\n 196#ifdef CONFIG_SMP\r\n 197        cpumask_var_t           affinity;\r\n 198        const struct cpumask    *affinity_hint;\r\n 199        unsigned int            node;\r\n 200#ifdef CONFIG_GENERIC_PENDING_IRQ\r\n 201        cpumask_var_t           pending_mask;\r\n 202#endif\r\n 203#endif\r\n 204        atomic_t                threads_active;\r\n 205        wait_queue_head_t       wait_for_threads;\r\n 206#ifdef CONFIG_PROC_FS\r\n 207        struct proc_dir_entry   *dir;\r\n 208#endif\r\n 209        const char              *name;\r\n 210}\r\n\r\n 216#ifndef CONFIG_SPARSE_IRQ\r\n 217extern struct irq_desc irq_desc[NR_IRQS];\r\n 218#endif<\/pre>\n<p>\u6240\u6709\u8fd9\u6837\u7684\u63cf\u8ff0\u7b26\u7ec4\u7ec7\u5728\u4e00\u8d77\u5f62\u6210irq_desc[NR_IRQS]\u6570\u7ec4\u3002\u4e0b\u9762\u6211\u4eec\u5bf9\u4e0a\u8ff0\u7ed3\u6784\u4f53\u7684\u90e8\u5206\u5b57\u7b26\u8fdb\u884c\u89e3\u91ca\uff1b<\/p>\n<p>irq\uff1a\u901a\u8fc7\u6570\u636e\u7c7b\u578b\u53ef\u77e5\u8fd9\u4fbf\u662f\u8fd9\u4e2a\u63cf\u8ff0\u7b26\u6240\u5bf9\u5e94\u7684\u4e2d\u65ad\u53f7\uff1b<br \/>\nhandle_irq\uff1a\u6307\u5411\u8be5IRQ\u7ebf\u7684\u516c\u5171\u670d\u52a1\u7a0b\u5e8f\uff1b<br \/>\nchip\uff1a\u5b83\u662f\u4e00\u4e2astruct irq_chip\u7c7b\u578b\u7684\u6307\u9488\uff0c\u662f\u4e2d\u65ad\u63a7\u5236\u5668\u7684\u63cf\u8ff0\u7b26\uff0c\u4e0e\u5e73\u53f0\u6709\u5173\uff0c\u4e0b\u6587\u6709\u8be6\u7ec6\u63cf\u8ff0\uff1b<br \/>\nhandler_data\uff1a\u7528\u4e8ehandler_irq\u7684\u53c2\u6570\uff1b<br \/>\nchip_data\uff1a\u7528\u4e8echip\u7684\u53c2\u6570\uff1b<br \/>\naction\uff1a\u4e00\u4e2astruct irqaction\u7c7b\u578b\u7684\u6307\u9488\uff08\u4e0b\u6587\u6709\u8be5\u7ed3\u6784\u7684\u8be6\u7ec6\u63cf\u8ff0\uff09\uff1b\u5b83\u6307\u5411\u4e00\u4e2a\u5355\u94fe\u8868\uff0c\u8be5\u5355\u94fe\u8868\u662f\u7531\u8be5\u4e2d\u65ad\u7ebf\u4e0a\u6240\u6709\u4e2d\u65ad\u670d\u52a1\u7a0b\u5e8f\uff08\u5bf9\u5e94struct irqaction\uff09\u6240\u8fde\u63a5\u8d77\u6765\u7684\uff1b<br \/>\nstatus\uff1a\u63cf\u8ff0\u4e2d\u65ad\u7ebf\u5f53\u524d\u7684\u72b6\u6001\uff1b<br \/>\ndepth\uff1a\u4e2d\u65ad\u7ebf\u88ab\u6fc0\u6d3b\u65f6\uff0c\u503c\u4e3a0\uff1b\u5176\u503c\u4e3a\u6b63\u6570\u65f6\uff0c\u8868\u793a\u88ab\u7981\u6b62\u7684\u6b21\u6570\uff1b<br \/>\nirq_count\uff1a\u8bb0\u5f55\u8be5\u4e2d\u65ad\u7ebf\u53d1\u751f\u4e2d\u65ad\u7684\u6b21\u6570\uff1b<br \/>\nirqs_unhandled\uff1a\u8be5IRQ\u7ebf\u4e0a\u672a\u5904\u7406\u4e2d\u65ad\u53d1\u751f\u7684\u6b21\u6570\uff1b<br \/>\nname\uff1a \/proc\/interrupts \u4e2d\u663e\u793a\u7684\u4e2d\u65ad\u540d\u79f0\uff1b<\/p>\n<h3>3.struct irqaction<\/h3>\n<p>\u5f53\u591a\u4e2a\u8bbe\u5907\u5171\u4eab\u4e00\u6761IRQ\u7ebf\u65f6\uff0c\u56e0\u4e3a\u6bcf\u4e2a\u8bbe\u5907\u90fd\u8981\u6709\u5404\u81ea\u7684ISR\u3002\u4e3a\u4e86\u80fd\u591f\u6b63\u786e\u5904\u7406\u6b64\u6761IRQ\u7ebf\u4e0a\u7684\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\uff08\u4e5f\u5c31\u662f\u533a\u5206\u6bcf\u4e2a\u8bbe\u5907\uff09\uff0c\u5c31\u9700\u8981\u6211\u4eec\u4f7f\u7528irqaction\u7ed3\u6784\u4f53\u3002\u5728\u8fd9\u4e2a\u7ed3\u6784\u4f53\u4e2d\uff0c\u4f1a\u6709\u4e13\u95e8\u7684handler\u5b57\u6bb5\u6307\u5411\u8be5\u8bbe\u5907\u7684\u771f\u6b63\u7684ISR\u3002\u5171\u4eab\u540c\u4e00\u6761IRQ\u7ebf\u4e0a\u7684\u591a\u4e2a\u8fd9\u6837\u7684\u7ed3\u6784\u4f53\u4f1a\u8fde\u63a5\u6210\u4e86\u4e00\u4e2a\u5355\u94fe\u8868\uff0c\u5373\u6240\u8c13\u7684\u4e2d\u65ad\u8bf7\u6c42\u961f\u5217\u3002\u4e2d\u65ad\u4ea7\u751f\u65f6\uff0c\u8be5IRQ\u7ebf\u7684\u4e2d\u65ad\u8bf7\u6c42\u961f\u5217\u4e0a\u6240\u6709\u7684ISR\u90fd\u4f1a\u88ab\u4f9d\u6b21\u8c03\u7528\uff0c\u56e0\u6b64\u6bcf\u4e2a\u8bbe\u5907\u7684ISR\u5fc5\u987b\u5224\u65ad\u5f53\u524d\u7684\u4e2d\u65ad\u662f\u5426\u662f\u81ea\u5df1\u6240\u5c5e\u7684\u8bbe\u5907\u4ea7\u751f\u7684\u3002irqaction\u7ed3\u6784\u5177\u4f53\u7684\u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n<pre class=\"brush:c\">  98typedef irqreturn_t (*irq_handler_t)(int, void *);\r\n\r\n 113struct irqaction {\r\n 114        irq_handler_t handler;\r\n 115        unsigned long flags;\r\n 116        const char *name;\r\n 117        void *dev_id;\r\n 118        struct irqaction *next;\r\n 119        int irq;\r\n 120        struct proc_dir_entry *dir;\r\n 121        irq_handler_t thread_fn;\r\n 122        struct task_struct *thread;\r\n 123        unsigned long thread_flags;\r\n 124};<\/pre>\n<p>handler\uff1a\u6307\u5411\u4e00\u4e2a\u5177\u4f53\u7684\u786c\u4ef6\u8bbe\u5907\u7684\u4e2d\u65ad\u670d\u52a1\u4f8b\u7a0b\uff0c\u53ef\u4ee5\u4ece\u6b64\u6307\u9488\u7684\u7c7b\u578b\u53d1\u73b0\u4e0e\u524d\u6587\u6211\u4eec\u6240\u5b9a\u4e49\u7684\u4e2d\u65ad\u5904\u7406\u51fd\u6570\u58f0\u660e\u76f8\u540c\uff1b<br \/>\nflags\uff1a\u5bf9\u5e94request_irq\u51fd\u6570\u4e2d\u6240\u4f20\u9012\u7684\u7b2c\u4e09\u4e2a\u53c2\u6570\uff0c\u53ef\u53d6IRQF_DISABLED\u3001IRQF_SAMPLE_RANDOM\u548cIRQF_SHARED\u5176\u4e2d\u4e4b\u4e00\uff1b<br \/>\nname\uff1a\u5bf9\u5e94\u4e8erequest_irq\u51fd\u6570\u4e2d\u6240\u4f20\u9012\u7684\u7b2c\u56db\u4e2a\u53c2\u6570\uff0c\u53ef\u901a\u8fc7\/proc\/interrupts\u6587\u4ef6\u67e5\u770b\u5230\uff1b<br \/>\nnext\uff1a\u6307\u5411\u4e0b\u4e00\u4e2airqaction\u7ed3\u6784\u4f53\uff1b<br \/>\ndev_id\uff1a\u5bf9\u5e94\u4e8erequest_irq\u51fd\u6570\u4e2d\u6240\u4f20\u9012\u7684\u7b2c\u4e94\u4e2a\u53c2\u6570\uff0c\u53ef\u53d6\u4efb\u610f\u503c\uff0c\u4f46\u5fc5\u987b\u552f\u4e00\u80fd\u591f\u4ee3\u8868\u53d1\u51fa\u4e2d\u65ad\u8bf7\u6c42\u7684\u8bbe\u5907\uff0c\u901a\u5e38\u53d6\u63cf\u8ff0\u8be5\u8bbe\u5907\u7684\u7ed3\u6784\u4f53\uff1b<br \/>\nirq\uff1a\u4e2d\u65ad\u53f7<\/p>\n<p>\u5982\u679c\u4e00\u4e2aIRQ\u7ebf\u4e0a\u6709\u4e2d\u65ad\u8bf7\u6c42\uff0c\u90a3\u4e48\u5185\u6838\u5c06\u4f9d\u6b21\u6b21\u8c03\u7528\u5728\u8be5\u4e2d\u65ad\u7ebf\u4e0a\u6ce8\u518c\u7684\u6bcf\u4e00\u4e2a\u4e2d\u65ad\u670d\u52a1\u7a0b\u5e8f\uff0c\u4f46\u662f\u5e76\u4e0d\u662f\u6240\u6709\u4e2d\u65ad\u670d\u52a1\u7a0b\u5e8f\u90fd\u88ab\u6267\u884c\u3002\u4e00\u822c\u786c\u4ef6\u8bbe\u5907\u90fd\u4f1a\u63d0\u4f9b\u4e00\u4e2a\u72b6\u6001\u5bc4\u5b58\u5668\uff0c\u4ee5\u4fbf\u4e2d\u65ad\u670d\u52a1\u7a0b\u5e8f\u8fdb\u884c\u68c0\u67e5\u662f\u5426\u5e94\u8be5\u4e3a\u8fd9\u4e2a\u786c\u4ef6\u670d\u52a1\u3002\u4e5f\u5c31\u662f\u8bf4\u5728\u6574\u4e2a\u4e2d\u65ad\u8bf7\u6c42\u961f\u5217\u4e2d\uff0c\u6700\u591a\u4f1a\u6709\u4e00\u4e2aISR\u88ab\u6267\u884c\uff0c\u4e5f\u5c31\u662f\u8be5ISR\u5bf9\u5e94\u7684\u90a3\u4e2a\u8bbe\u5907\u4ea7\u751f\u4e86\u4e2d\u65ad\u8bf7\u6c42\u65f6\uff1b\u4e0d\u8fc7\u5f53\u8be5IRQ\u7ebf\u4e0a\u67d0\u4e2a\u8bbe\u5907\u672a\u627e\u5230\u5339\u914d\u7684ISR\u65f6\uff0c\u90a3\u8fd9\u4e2a\u4e2d\u65ad\u5c31\u4e0d\u4f1a\u88ab\u5904\u7406\u3002\u6b64\u65f6irq_desc\u7ed3\u6784\u4e2d\u7684irqs_unhandled\u5b57\u6bb5\u5c31\u4f1a\u52a01\u3002<\/p>\n<h3>4.struct irq_chip<\/h3>\n<p>struct irq_chip\u662f\u4e00\u4e2a\u4e2d\u65ad\u63a7\u5236\u5668\u7684\u63cf\u8ff0\u7b26\u3002\u901a\u5e38\u4e0d\u540c\u7684\u4f53\u7cfb\u7ed3\u6784\u5c31\u6709\u4e00\u5957\u81ea\u5df1\u7684\u4e2d\u65ad\u5904\u7406\u65b9\u5f0f\u3002\u5185\u6838\u4e3a\u4e86\u7edf\u4e00\u7684\u5904\u7406\u4e2d\u65ad\uff0c\u63d0\u4f9b\u4e86\u5e95\u5c42\u7684\u4e2d\u65ad\u5904\u7406\u62bd\u8c61\u63a5\u53e3\uff0c\u5bf9\u4e8e\u6bcf\u4e2a\u5e73\u53f0\u90fd\u9700\u8981\u5b9e\u73b0\u5e95\u5c42\u7684\u63a5\u53e3\u51fd\u6570\u3002\u8fd9\u6837\u5bf9\u4e8e\u4e0a\u5c42\u7684\u4e2d\u65ad\u901a\u7528\u5904\u7406\u7a0b\u5e8f\u5c31\u65e0\u9700\u4efb\u4f55\u6539\u52a8\u3002\u8fd9\u6837\u7684\u7ed3\u6784\u4f53\u5c31\u597d\u6bd4\u4e00\u4e2a\u63d2\u677f\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5404\u79cd\u63d2\u5934\u3002\u81f3\u4e8e\u63d2\u677f\u5185\u90e8\u662f\u5982\u4f55\u5b9e\u73b0\u7684\uff0c\u4f7f\u7528\u8005\u5e76\u4e0d\u9700\u8981\u8fc7\u4e8e\u5173\u5fc3\u3002<\/p>\n<p>\u6bd4\u5982\u7ecf\u5178\u7684\u4e2d\u65ad\u63a7\u5236\u5668\u662f2\u7247\u7ea7\u8054\u76848259A\uff0c\u90a3\u4e48\u5f9715\u4e2airq_desc\u63cf\u8ff0\u7b26\uff0c\u6bcf\u4e00\u4e2a\u63cf\u8ff0\u7b26\u7684irq_chip\u90fd\u6307\u5411\u63cf\u8ff08259A\u7684i8259A_irq_type\u53d8\u91cf(arch\/alpha\/kernel\/irq_i8259.c)\uff1a<\/p>\n<pre class=\"brush:c\"> 86struct irq_chip i8259a_irq_type = {\r\n  87        .name           = \"XT-PIC\",\r\n  88        .startup        = i8259a_startup_irq,\r\n  89        .shutdown       = i8259a_disable_irq,\r\n  90        .enable         = i8259a_enable_irq,\r\n  91        .disable        = i8259a_disable_irq,\r\n  92        .ack            = i8259a_mask_and_ack_irq,\r\n  93        .end            = i8259a_end_irq,\r\n  94};<\/pre>\n<p>\u8fd9\u4e00\u70b9\u7c7b\u4f3c\u4e8eVFS\u4e2d\u6240\u91c7\u7528\u7684\u539f\u7406\uff1a\u901a\u8fc7struct file_operations\u63d0\u4f9b\u7edf\u4e00\u7684\u63a5\u53e3\uff0c\u6bcf\u79cd\u6587\u4ef6\u7cfb\u7edf\u90fd\u5fc5\u987b\u5177\u4f53\u5b9e\u73b0\u8fd9\u4e2a\u7ed3\u6784\u4f53\u4e2d\u6240\u63d0\u4f9b\u7684\u63a5\u53e3\u3002struct irq_chip\u5177\u4f53\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre class=\"brush:c\">111struct irq_chip {\r\n112        const char      *name;\r\n113        unsigned int    (*startup)(unsigned int irq);\r\n114        void            (*shutdown)(unsigned int irq);\r\n115        void            (*enable)(unsigned int irq);\r\n116        void            (*disable)(unsigned int irq);\r\n117\r\n118        void            (*ack)(unsigned int irq);\r\n119        void            (*mask)(unsigned int irq);\r\n120        void            (*mask_ack)(unsigned int irq);\r\n121        void            (*unmask)(unsigned int irq);\r\n122        void            (*eoi)(unsigned int irq);\r\n123\r\n124        void            (*end)(unsigned int irq);\r\n125        int             (*set_affinity)(unsigned int irq,\r\n126                                        const struct cpumask *dest);\r\n127        int             (*retrigger)(unsigned int irq);\r\n128        int             (*set_type)(unsigned int irq, unsigned int flow_type);\r\n129        int             (*set_wake)(unsigned int irq, unsigned int on);\r\n130\r\n131        void            (*bus_lock)(unsigned int irq);\r\n132        void            (*bus_sync_unlock)(unsigned int irq);\r\n133\r\n134        \/* Currently used only by UML, might disappear one day.*\/\r\n135#ifdef CONFIG_IRQ_RELEASE_METHOD\r\n136        void            (*release)(unsigned int irq, void *dev_id);\r\n137#endif\r\n138        \/*\r\n139         * For compatibility, -&gt;typename is copied into -&gt;name.\r\n140         * Will disappear.\r\n141         *\/\r\n142        const char      *typename;\r\n143};<\/pre>\n<p>name:\u4e2d\u65ad\u63a7\u5236\u5668\u7684\u540d\u5b57\uff1b<br \/>\nStartup\uff1a\u542f\u52a8\u4e2d\u65ad\u7ebf\uff1b<br \/>\nShutdown\uff1a\u5173\u95ed\u4e2d\u65ad\u7ebf\uff1b<br \/>\nEnable\uff1a\u5141\u8bb8\u4e2d\u65ad\uff1b<br \/>\nDisable\uff1a\u7981\u6b62\u4e2d\u65ad\uff1b<br \/>\n<strong><br \/>\n<\/strong><\/p>\n<h3>5.\u6570\u636e\u7ed3\u6784\u4e4b\u95f4\u7684\u5173\u7cfb<\/h3>\n<p>\u9996\u5148\u6211\u4eec\u901a\u8fc7\u4e0b\u56fe\u6765\u4e86\u89e3\u4e0a\u8ff0\u4e09\u4e2a\u6570\u636e\u7ed3\u6784\u7684\u5173\u7cfb\uff1a<br \/>\n<a href=\"http:\/\/edsionte.com\/techblog\/archives\/1618\/irq-2\" rel=\"attachment wp-att-1671\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-medium wp-image-1671\" title=\"IRQ\" src=\"http:\/\/edsionte.com\/techblog\/wordpress\/wp-content\/uploads\/2010\/10\/IRQ1-300x285.jpg\" alt=\"\" width=\"300\" height=\"285\" srcset=\"http:\/\/edsionte.com\/techblog\/wordpress\/wp-content\/uploads\/2010\/10\/IRQ1-300x285.jpg 300w, http:\/\/edsionte.com\/techblog\/wordpress\/wp-content\/uploads\/2010\/10\/IRQ1.jpg 637w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><br \/>\n\u901a\u8fc7\u4e0a\u8ff0\u5206\u6790\uff0c\u6211\u4eec\u53ef\u4ee5\u5927\u81f4\u7684\u77e5\u9053\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u7684\u8c03\u7528\u8fc7\u7a0b\uff1a\u5728do_IRQ\u51fd\u6570\u4e2d\uff0c\u901a\u8fc7\u5bf9irq_desc\u7ed3\u6784\u4f53\u4e2dhandler_irq\u5b57\u6bb5\u7684\u5f15\u7528\uff0c\u8c03\u7528handler_irq\u6240\u6307\u5411\u7684\u516c\u5171\u670d\u52a1\u7a0b\u5e8f\uff1b\u5728\u8fd9\u4e2a\u516c\u5171\u670d\u52a1\u7a0b\u5e8f\u4e2d\u4f1a\u8c03\u7528hand_IRQ_event\u51fd\u6570\uff1b\u5728hand_IRQ_event\u51fd\u6570\u4e2d\uff0c\u901a\u8fc7\u5bf9irqaction\u7ed3\u6784\u4f53\u4e2dhandler\u5b57\u6bb5\u7684\u5f15\u7528\u6700\u7ec8\u8c03\u7528\u6211\u4eec\u6240\u5199\u7684\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u3002<\/p>\n<p>\u53e6\u5916\uff0c\u901a\u8fc7\u4e0a\u8ff0\u5206\u6790\uff0c\u6211\u4eec\u77e5\u9053struct irq_chip\u63cf\u8ff0\u4e86\u4e2d\u65ad\u6700\u5e95\u5c42\u7684\u90e8\u5206\uff1b\u800cstruct irqacton\u5219\u63cf\u8ff0\u6700\u4e0a\u5c42\u5177\u4f53\u7684\u4e2d\u65ad\u5904\u7406\u51fd\u6570\uff1b\u800c\u4e0e\u4e2d\u65ad\u5411\u91cf\u6240\u5bf9\u5e94\u7684struct desc\u5219\u7c7b\u4f3c\u4e00\u4e2a\u4e2d\u95f4\u5c42\uff0c\u5c06\u4e2d\u65ad\u4e2d\u7684\u786c\u4ef6\u76f8\u5173\u7684\u90e8\u5206\u548c\u8f6f\u4ef6\u76f8\u5173\u7684\u90e8\u5206\u8fde\u63a5\u8d77\u6765\u3002<\/p>\n<h3>6.\u5185\u6838\u5bf9\u5f02\u5e38\u7684\u5904\u7406<\/h3>\n<p>\u4e0e\u4e2d\u65ad\u4e0d\u540c\uff0c\u5404\u79cd\u5f02\u5e38\u90fd\u6709\u56fa\u5b9a\u7684\u4e2d\u65ad\u5411\u91cf\uff080\uff5e31\uff09\u4ee5\u53ca\u56fa\u5b9a\u7684\u5f02\u5e38\u5904\u7406\u7a0b\u5e8f\u3002\u56e0\u6b64\uff0c\u5f53\u5f02\u5e38\u53d1\u751f\u65f6\uff0c\u5c06\u76f4\u63a5\u8df3\u8f6c\u5230\u76f8\u5e94\u7684\u670d\u52a1\u7a0b\u5e8f\u4e2d\u6267\u884c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Latest Update:2010\/10\/12 1.\u6982\u8ff0 \u901a\u8fc7\u524d\u6587\uff0c\u6211\u4eec\u5df2\u7ecf\u77e5\u9053\u4e86\u4e2d\u65ad\u901a\u5e38\u7531\u4e0a\u4e0b\u4e24\u90e8\u5206\u7ec4\u6210\u3002 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[110],"tags":[134,108,157,147],"class_list":["post-1618","post","type-post","status-publish","format-standard","hentry","category-linux","tag-kernel","tag-linux","tag-157","tag-147"],"views":14726,"_links":{"self":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/1618","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/comments?post=1618"}],"version-history":[{"count":0,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/1618\/revisions"}],"wp:attachment":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/media?parent=1618"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/categories?post=1618"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/tags?post=1618"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}