鸿蒙内核源码分析(中断管理篇) | 硬中断的实现类似观察者模式 | 百篇博客分析鸿蒙源码 | v44.01

    百万汉字注解 + 百篇博客分析 => 挖透鸿蒙内核源码
    https://my.oschina.net/weharmony

README.md

@@ -75,8 +75,10 @@
 ### **ARM架构**
 
 * [(中断概念篇) | 外人眼中权势滔天的当红海公公 ](https://weharmony.gitee.io/中断概念篇.html) **[<  csdn](https://blog.csdn.net/kuangyufei/article/details/115014442) [ | oschina  >](https://my.oschina.net/weharmony/blog/4992750)**
-  
-* [(中断切换篇) | 自下而上逐行分析保存和恢复中断现场全过程 ](https://weharmony.gitee.io/中断切换篇.html) **[<  csdn](https://blog.csdn.net/kuangyufei/article/details/114988891) [ | oschina  >](https://my.oschina.net/weharmony/blog/4990948)**
+
+* [(中断管理篇) | 硬中断的实现类似观察者模式 ](https://weharmony.gitee.io/中断管理篇.html) **[<  csdn](https://blog.csdn.net/kuangyufei/article/details/115130055) [ | oschina  >](https://my.oschina.net/weharmony/blog/4995800)**
+
+* [(中断切换篇) | 在中断切换的那一瞬间发生了什么? ](https://weharmony.gitee.io/中断切换篇.html) **[<  csdn](https://blog.csdn.net/kuangyufei/article/details/114988891) [ | oschina  >](https://my.oschina.net/weharmony/blog/4990948)**
 
 * [(汇编汇总篇) |  鸿蒙所有的汇编代码都在这里 ](https://weharmony.gitee.io/汇编汇总篇.html) **[<  csdn](https://blog.csdn.net/kuangyufei/article/details/114597179) [ | oschina  >](https://my.oschina.net/weharmony/blog/4977924)**
 
@@ -94,7 +96,7 @@
 
 ### **进程线程**
 
-* [(任务切换篇) | 逐行汇编分析TaskContext保存和恢复全过程 ](https://weharmony.gitee.io/任务切换篇.html) **[<  csdn](https://blog.csdn.net/kuangyufei/article/details/114890180) [ | oschina  >](https://my.oschina.net/weharmony/blog/4988628)**
+* [(任务切换篇) | 汇编逐行注解分析任务上下文 ](https://weharmony.gitee.io/任务切换篇.html) **[<  csdn](https://blog.csdn.net/kuangyufei/article/details/114890180) [ | oschina  >](https://my.oschina.net/weharmony/blog/4988628)**
   
 * [(CPU篇) | 内核是如何描述CPU的? ](https://weharmony.gitee.io/CPU篇.html) **[<  csdn](https://blog.csdn.net/kuangyufei/article/details/113782749) [ | oschina  >](https://my.oschina.net/weharmony/blog/4952034)**
 
@@ -209,4 +211,6 @@
 
 ![公众号: 鸿蒙内核源码分析](https://gitee.com/weharmony/docs/raw/master/pic/other/so1so.png)
 
-[进入 >> 百万汉字注解 百篇博客分析 精读鸿蒙源码 深挖地基工程](https://weharmony.gitee.io) **[< gitee ](https://gitee.com/weharmony/kernel_liteos_a_note)[| csdn](https://blog.csdn.net/kuangyufei)  [ | oschina >](https://my.oschina.net/weharmony)**
+[进入 >> 百万汉字注解 百篇博客分析 精读鸿蒙源码 深挖地基工程](https://weharmony.gitee.io) **[< gitee ](https://gitee.com/weharmony/kernel_liteos_a_note)[| csdn](https://blog.csdn.net/kuangyufei)  [ | oschina >](https://my.oschina.net/weharmony)**
\ No newline at end of file
+
+

arch/arm/arm/src/los_hwi.c

@@ -130,9 +130,9 @@ LITE_OS_SEC_BSS  SPIN_LOCK_INIT(g_hwiSpin); //注意全局变量 g_hwiSpin 是
 #define HWI_LOCK(state)       LOS_SpinLockSave(&g_hwiSpin, &(state))
 #define HWI_UNLOCK(state)     LOS_SpinUnlockRestore(&g_hwiSpin, (state))
 
-size_t g_intCount[LOSCFG_KERNEL_CORE_NUM] = {0};//记录每个CPU core的中断数量 
-HwiHandleForm g_hwiForm[OS_HWI_MAX_NUM];		//记录每个硬件中断实体内容             @note_why 用 form 来表示？有种写 HTML的感觉
-STATIC CHAR *g_hwiFormName[OS_HWI_MAX_NUM] = {0};//记录每个硬中断的名称 OS_HWI_MAX_NUM = 128 定义于 hi3516dv300
+size_t g_intCount[LOSCFG_KERNEL_CORE_NUM] = {0};//记录每个CPUcore的中断数量 
+HwiHandleForm g_hwiForm[OS_HWI_MAX_NUM];		//中断注册表        @note_why 用 form 来表示？有种写 HTML的感觉
+STATIC CHAR *g_hwiFormName[OS_HWI_MAX_NUM] = {0};//记录每个硬中断的名称
 STATIC UINT32 g_hwiFormCnt[OS_HWI_MAX_NUM] = {0};//记录每个硬中断的总数量
 
 VOID OsIncHwiFormCnt(UINT32 index)	//增加一个中断数,递增的，所以只有++ ,没有--，
@@ -158,7 +158,7 @@ VOID OsInterrupt(UINT32 intNum)//中断实际处理函数
     UINT32 *intCnt = NULL;
 
     intCnt = &g_intCount[ArchCurrCpuid()];//当前CPU的中断总数量 ++
-    *intCnt = *intCnt + 1;
+    *intCnt = *intCnt + 1;//@note_why 这里没看明白为什么要 +1
 
 #ifdef LOSCFG_CPUP_INCLUDE_IRQ //开启查询系统CPU的占用率的中断
     OsCpupIrqStart();//记录本次中断处理开始时间
@@ -178,7 +178,7 @@ VOID OsInterrupt(UINT32 intNum)//中断实际处理函数
                 UINTPTR *param = (UINTPTR *)(hwiForm->uwParam);
                 func((INT32)(*param), (VOID *)(*(param + 1)));//运行带参数的回调函数
             }
-        } else {//木有参数的情况
+        } else {//没有参数的情况
             HWI_PROC_FUNC0 func = (HWI_PROC_FUNC0)hwiForm->pfnHook;//获取回调函数
             if (func != NULL) {
                 func();//运行回调函数
@@ -187,7 +187,7 @@ VOID OsInterrupt(UINT32 intNum)//中断实际处理函数
 #ifndef LOSCFG_NO_SHARED_IRQ
     }
 #endif
-    ++g_hwiFormCnt[intNum];//中断数量计数器++
+    ++g_hwiFormCnt[intNum];//对应中断号计数器总数累加
 
     *intCnt = *intCnt - 1;	//@note_why 这里没看明白为什么要 -1 
 #ifdef LOSCFG_CPUP_INCLUDE_IRQ	//开启查询系统CPU的占用率的中断

arch/arm/include/los_hwi.h

@@ -261,7 +261,7 @@ typedef struct tagIrqParam {	//中断参数
     const CHAR *pName;	//名称
 } HwiIrqParam;
 
-extern HwiHandleForm g_hwiForm[OS_HWI_MAX_NUM];
+extern HwiHandleForm g_hwiForm[OS_HWI_MAX_NUM];//中断注册表
 
 /**
  * @ingroup los_hwi

kernel/include/los_mp.h

-/*
- * Copyright (c) 2013-2019, Huawei Technologies Co., Ltd. All rights reserved.
- * Copyright (c) 2020, Huawei Device Co., Ltd. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without modification,
- * are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice, this list of
- *    conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright notice, this list
- *    of conditions and the following disclaimer in the documentation and/or other materials
- *    provided with the distribution.
- *
- * 3. Neither the name of the copyright holder nor the names of its contributors may be used
- *    to endorse or promote products derived from this software without specific prior written
- *    permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef _LOS_MP_H
-#define _LOS_MP_H
-
-#include "los_config.h"
-
-#ifdef __cplusplus
-#if __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-#endif /* __cplusplus */
-
-#define OS_MP_CPU_ALL       LOSCFG_KERNEL_CPU_MASK
-
-#define OS_MP_GC_PERIOD     100 /* ticks */
-
-typedef enum {//处理器之间发送消息
-    LOS_MP_IPI_WAKEUP,	//唤醒CPU
-    LOS_MP_IPI_SCHEDULE,//调度CPU
-    LOS_MP_IPI_HALT,	//停止CPU
-} MP_IPI_TYPE;
-
-#if (LOSCFG_KERNEL_SMP == YES)
-extern VOID LOS_MpSchedule(UINT32 target);
-extern VOID OsMpWakeHandler(VOID);
-extern VOID OsMpScheduleHandler(VOID);
-extern VOID OsMpHaltHandler(VOID);
-extern UINT32 OsMpInit(VOID);
-#else
-STATIC INLINE VOID LOS_MpSchedule(UINT32 target)
-{
-    (VOID)target;
-}
-#endif
-
-#ifdef __cplusplus
-#if __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* __cplusplus */
-
-#endif /* _LOS_MP_H_ */
+/*
+ * Copyright (c) 2013-2019, Huawei Technologies Co., Ltd. All rights reserved.
+ * Copyright (c) 2020, Huawei Device Co., Ltd. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ *    conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *    of conditions and the following disclaimer in the documentation and/or other materials
+ *    provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its contributors may be used
+ *    to endorse or promote products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _LOS_MP_H
+#define _LOS_MP_H
+
+#include "los_config.h"
+
+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */
+
+#define OS_MP_CPU_ALL       LOSCFG_KERNEL_CPU_MASK
+
+#define OS_MP_GC_PERIOD     100 /* ticks */
+
+typedef enum {//核间中断
+    LOS_MP_IPI_WAKEUP,	//唤醒CPU
+    LOS_MP_IPI_SCHEDULE,//调度CPU
+    LOS_MP_IPI_HALT,	//停止CPU
+} MP_IPI_TYPE;
+
+#if (LOSCFG_KERNEL_SMP == YES)
+extern VOID LOS_MpSchedule(UINT32 target);
+extern VOID OsMpWakeHandler(VOID);
+extern VOID OsMpScheduleHandler(VOID);
+extern VOID OsMpHaltHandler(VOID);
+extern UINT32 OsMpInit(VOID);
+#else
+STATIC INLINE VOID LOS_MpSchedule(UINT32 target)
+{
+    (VOID)target;
+}
+#endif
+
+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
+
+#endif /* _LOS_MP_H_ */

platform/hw/arm/interrupt/gic/gic_v2.c

@@ -45,13 +45,13 @@ STATIC UINT32 g_curIrqNum = 0; //记录当前中断号
  *   0b00: forward to the cpu interfaces specified in cpu_mask
  *   0b01: forward to all cpu interfaces
  *   0b10: forward only to the cpu interface that request the irq
- */
+ *///SGI软件触发中断(Software Generated Interrupt)通常用于多核间通讯
 STATIC VOID GicWriteSgi(UINT32 vector, UINT32 cpuMask, UINT32 filter)
 {
     UINT32 val = ((filter & 0x3) << 24) | ((cpuMask & 0xFF) << 16) |
                  (vector & 0xF);
 
-    GIC_REG_32(GICD_SGIR) = val;
+    GIC_REG_32(GICD_SGIR) = val;//写SGI寄存器
 }
 //向指定核发送核间中断
 VOID HalIrqSendIpi(UINT32 target, UINT32 ipi)
@@ -107,7 +107,7 @@ VOID HalIrqClear(UINT32 vector)
 //给每个CPU core初始化硬件中断
 VOID HalIrqInitPercpu(VOID)
 {
-    /* unmask interrupts */	//取消屏蔽中断
+    /* unmask interrupts */	//取消中断屏蔽
     GIC_REG_32(GICC_PMR) = 0xFF;
 
     /* enable gic cpu interface */	//启用gic cpu接口
@@ -138,13 +138,13 @@ VOID HalIrqInit(VOID)
         GIC_REG_32(GICD_ICENABLER(i / 32)) = ~0;
     }
 
-    HalIrqInitPercpu();
+    HalIrqInitPercpu();//初始化当前CPU中断信息
 
     /* enable gic distributor control */
-    GIC_REG_32(GICD_CTLR) = 1;
+    GIC_REG_32(GICD_CTLR) = 1;//使能分发中断寄存器,该寄存器作用是允许给CPU发送中断信号
 
 #if (LOSCFG_KERNEL_SMP == YES)
-    /* register inter-processor interrupt *///注册寄存器处理器间中断处理函数,啥意思?就是当前CPU核向其他CPU核发送中断信号
+    /* register inter-processor interrupt *///注册核间中断,啥意思?就是CPU各核直接可以发送中断信号
     //处理器间中断允许一个CPU向系统其他的CPU发送中断信号，处理器间中断（IPI）不是通过IRQ线传输的，而是作为信号直接放在连接所有CPU本地APIC的总线上。
     LOS_HwiCreate(LOS_MP_IPI_WAKEUP, 0xa0, 0, OsMpWakeHandler, 0);//中断处理函数
     LOS_HwiCreate(LOS_MP_IPI_SCHEDULE, 0xa0, 0, OsMpScheduleHandler, 0);//中断处理函数
@@ -154,7 +154,7 @@ VOID HalIrqInit(VOID)
 //硬中断处理函数，这里由硬件触发,调用见于 ..\arch\arm\arm\src\los_dispatch.S
 VOID HalIrqHandler(VOID)
 {
-    UINT32 iar = GIC_REG_32(GICC_IAR);
+    UINT32 iar = GIC_REG_32(GICC_IAR);//从中断确认寄存器获取中断ID号
     UINT32 vector = iar & 0x3FFU;//计算中断向量号
 
     /*
@@ -165,12 +165,12 @@ VOID HalIrqHandler(VOID)
     if (vector >= OS_HWI_MAX_NUM) {
         return;
     }
-    g_curIrqNum = vector;
+    g_curIrqNum = vector;//记录当前中断ID号
 
     OsInterrupt(vector);//调用上层中断处理函数
 
     /* use orignal iar to do the EOI */
-    GIC_REG_32(GICC_EOIR) = iar;
+    GIC_REG_32(GICC_EOIR) = iar;//更新中断结束寄存器
 }
 //获取中断控制器版本
 CHAR *HalIrqVersion(VOID)

platform/hw/include/gic_common.h

@@ -63,7 +63,7 @@ enum {
 #define GICC_PMR                        (GICC_OFFSET + 0x04)            /* Interrupt Priority Mask Register */	//中断优先级屏蔽寄存器
 #define GICC_BPR                        (GICC_OFFSET + 0x08)            /* Binary Point Register */				//二进制点寄存器
 #define GICC_IAR                        (GICC_OFFSET + 0x0c)            /* Interrupt Acknowledge Register */	//中断确认寄存器
-#define GICC_EOIR                       (GICC_OFFSET + 0x10)            /* End of Interrupt Register */			//中断结尾寄存器
+#define GICC_EOIR                       (GICC_OFFSET + 0x10)            /* End of Interrupt Register */			//中断结束寄存器
 #define GICC_RPR                        (GICC_OFFSET + 0x14)            /* Running Priority Register */			//运行优先寄存器
 #define GICC_HPPIR                      (GICC_OFFSET + 0x18)            /* Highest Priority Pending Interrupt Register */	//最高优先级挂起中断寄存器
 #endif

zzz/git/push.sh

 git add -A
-git commit -m  '鸿蒙内核源码分析(中断概念篇) | 外人眼中权势滔天的当红海公公 | 百篇博客分析鸿蒙源码 | v43.01
+git commit -m  '鸿蒙内核源码分析(中断管理篇) | 硬中断的实现类似观察者模式 | 百篇博客分析鸿蒙源码 | v44.01
     百万汉字注解 + 百篇博客分析 => 挖透鸿蒙内核源码
-    https://weharmony.gitee.io
+    https://my.oschina.net/weharmony
 '
 
 git push  origin master