OpenHarmony 移植案例与原理 - startup子系统之bootstrap_lite服务启动引导部件（1）

base/startup/bootstrap_lite/    # 启动引导组件
└── services
    └── source                  # 启动引导组件源文件目录

    {
      "subsystem": "startup",
      "components": [
        {
          "component": "bootstrap_lite"
        },
        ......
      ]
    },

static void RegisterCustomATCmd()
{
    cmd_tbl_t cmd_list[] = {
        {"AT+IFCFG", 8, at_lwip_ifconfig, "AT+IFCFG - ifconfig\n"},
        {"AT+STARTAP", 7, at_start_softap, "AT+STARTAP - start wifi softap\n"},
        {"AT+STOPAP", 1, at_stop_softap, "AT+STOPAP - stop wifi softap\n"},
        {"AT+STARTSTA", 1, at_start_wifista, "AT+STARTSTA - start wifi sta\n"},
        {"AT+STOPSTA", 1, at_stop_wifista, "AT+STOPSTA - stop wifi sta\n"},
        {"AT+DHCP", 3, at_setup_dhcp, "AT+DHCP - dhcp\n"},
        {"AT+DHCPS", 3, at_setup_dhcps, "AT+DHCPS - dhcps\n"},
    };
    for (int i = 0; i < sizeof(cmd_list) / sizeof(cmd_tbl_t); i++) {
        console_cmd_add(&cmd_list[i]);
    }
}
SYS_SERVICE_INIT(RegisterCustomATCmd);

/* zInit code and data - will be freed after init */
 .zInit (.) :
 {
  __zinitcall_bsp_start = .;
  KEEP (*(.zinitcall.bsp0.init))
  KEEP (*(.zinitcall.bsp1.init))
  KEEP (*(.zinitcall.bsp2.init))
  KEEP (*(.zinitcall.bsp3.init))
  KEEP (*(.zinitcall.bsp4.init))
  __zinitcall_bsp_end = .;
  . = ALIGN(4);
  __zinitcall_device_start = .;
  KEEP (*(.zinitcall.device0.init))
  KEEP (*(.zinitcall.device1.init))
  KEEP (*(.zinitcall.device2.init))
  KEEP (*(.zinitcall.device3.init))
  KEEP (*(.zinitcall.device4.init))
  __zinitcall_device_end = .;
  . = ALIGN(4);
  __zinitcall_core_start = .;
  KEEP (*(.zinitcall.core0.init))
  KEEP (*(.zinitcall.core1.init))
  KEEP (*(.zinitcall.core2.init))
  KEEP (*(.zinitcall.core3.init))
  KEEP (*(.zinitcall.core4.init))
  __zinitcall_core_end = .;
  . = ALIGN(4);
  __zinitcall_sys_service_start = .;
  KEEP (*(.zinitcall.sys.service0.init))
  KEEP (*(.zinitcall.sys.service1.init))
  KEEP (*(.zinitcall.sys.service2.init))
  KEEP (*(.zinitcall.sys.service3.init))
  KEEP (*(.zinitcall.sys.service4.init))
  __zinitcall_sys_service_end = .;
  . = ALIGN(4);
  __zinitcall_sys_feature_start = .;
  KEEP (*(.zinitcall.sys.feature0.init))
  KEEP (*(.zinitcall.sys.feature1.init))
  KEEP (*(.zinitcall.sys.feature2.init))
  KEEP (*(.zinitcall.sys.feature3.init))
  KEEP (*(.zinitcall.sys.feature4.init))
  __zinitcall_sys_feature_end = .;
  . = ALIGN(4);
  __zinitcall_run_start = .;
  KEEP (*(.zinitcall.run0.init))
  KEEP (*(.zinitcall.run1.init))
  KEEP (*(.zinitcall.run2.init))
  KEEP (*(.zinitcall.run3.init))
  KEEP (*(.zinitcall.run4.init))
  __zinitcall_run_end = .;
  . = ALIGN(4);
  __zinitcall_app_service_start = .;
  KEEP (*(.zinitcall.app.service0.init))
  KEEP (*(.zinitcall.app.service1.init))
  KEEP (*(.zinitcall.app.service2.init))
  KEEP (*(.zinitcall.app.service3.init))
  KEEP (*(.zinitcall.app.service4.init))
  __zinitcall_app_service_end = .;
  . = ALIGN(4);
  __zinitcall_app_feature_start = .;
  KEEP (*(.zinitcall.app.feature0.init))
  KEEP (*(.zinitcall.app.feature1.init))
  KEEP (*(.zinitcall.app.feature2.init))
  KEEP (*(.zinitcall.app.feature3.init))
         KEEP (*(.zinitcall.app.feature4.init))
  __zinitcall_app_feature_end = .;
  . = ALIGN(4);
  __zinitcall_test_start = .;
  KEEP (*(.zinitcall.test0.init))
  KEEP (*(.zinitcall.test1.init))
  KEEP (*(.zinitcall.test2.init))
  KEEP (*(.zinitcall.test3.init))
  KEEP (*(.zinitcall.test4.init))
  __zinitcall_test_end = .;
  . = ALIGN(4);
  __zinitcall_exit_start = .;
  KEEP (*(.zinitcall.exit0.init))
  KEEP (*(.zinitcall.exit1.init))
  KEEP (*(.zinitcall.exit2.init))
  KEEP (*(.zinitcall.exit3.init))
  KEEP (*(.zinitcall.exit4.init))
  __zinitcall_exit_end = .;
  . = ALIGN(4);
 } > FLASH

board_ld_flags = [
....
  "-lbootstrap",

int main(void);
extern void OHOS_SystemInit(void);
    ......
        OHOS_SystemInit();
    ......
    while (1) {
        osDelay(1000);
        TRACE(0, "main idle");
    }
}

`欢迎大家关注工粽号<程序猿百晓生>，可以了解到以下知识点。`
1.OpenHarmony开发基础
2.OpenHarmony北向开发环境搭建
3.鸿蒙南向开发环境的搭建
4.鸿蒙生态应用开发白皮书V2.0 & V3.0
5.鸿蒙开发面试真题（含参考答案） 
6.TypeScript入门学习手册
7.OpenHarmony 经典面试题(含参考答案)
8.OpenHarmony设备开发入门【最新版】
9.沉浸式剖析OpenHarmony源代码
10.系统定制指南
11.【OpenHarmony】Uboot 驱动加载流程
12.OpenHarmony构建系统--GN与子系统、部件、模块详解
13.ohos开机init启动流程
14.鸿蒙版性能优化指南
.......

  /**
  * @brief Identifies the entry for initializing and starting a core system service by the
  * priority 2.
  *
  * This macro is used to identify the entry called at the priority 2 in the core system
  * service phase of the startup process. \n
  *
  * @param func Indicates the entry function for initializing and starting a core system service.
  * The type is void (*)(void).
  */
  #define SYS_SERVICE_INIT(func) LAYER_INITCALL_DEF(func, sys_service, "sys.service")
  /**
  * @brief Identifies the entry for initializing and starting a core system service by the
  * specified priority.
  *
  * This macro is used to identify the entry called at the specified priority in the core system
  * service phase of the startup process. \n
  *
  * @param func Indicates the entry function for initializing and starting a core system service.
  * The type is void (*)(void).
  * @param priority Indicates the calling priority when starting the core system service in the
  * startup phase. The value range is [0,5), and the calling sequence is 0, 1, 2, 3, and 4.
  */
  #define SYS_SERVICE_INIT_PRI(func, priority) LAYER_INITCALL(func, sys_service, "sys.service", priority)

⑴  typedef void (*InitCall)(void);

    #define USED_ATTR __attribute__((used))

⑵  #ifdef LAYER_INIT_SHARED_LIB
⑶  #define LAYER_INIT_LEVEL_0 0
    #define LAYER_INIT_LEVEL_1 1
    #define LAYER_INIT_LEVEL_2 2
    #define LAYER_INIT_LEVEL_3 3
    #define LAYER_INIT_LEVEL_4 4
⑷  #define CTOR_VALUE_device 100
    #define CTOR_VALUE_core 110
    #define CTOR_VALUE_sys_service 120
    #define CTOR_VALUE_sys_feature 130
    #define CTOR_VALUE_app_service 140
    #define CTOR_VALUE_app_feature 150
    #define CTOR_VALUE_run  700
⑸  #define LAYER_INITCALL(func, layer, clayer, priority)                                     \
        static __attribute__((constructor(CTOR_VALUE_##layer + LAYER_INIT_LEVEL_##priority))) \
            void BOOT_##layer##priority##func() {func();}
    #else
⑹  #define LAYER_INITCALL(func, layer, clayer, priority)            \
        static const InitCall USED_ATTR __zinitcall_##layer##_##func \
            __attribute__((section(".zinitcall." clayer #priority ".init"))) = func
    #endif
    // Default priority is 2, priority range is [0, 4]
    #define LAYER_INITCALL_DEF(func, layer, clayer) \
        LAYER_INITCALL(func, layer, clayer, 2)