uboot的jumptable_init函数分析

一、函数说明

函数功能：安装系统函数指针

函数位置：common/exports.c

二、函数分析

 void jumptable_init (void)
 {
     int i;

     gd->jt = (void **) malloc (XF_MAX * sizeof (void *)); //在堆中开辟指针空间
     for (i = ; i < XF_MAX; i++)
         gd->jt[i] = (void *) dummy;                       //指针空间都初始化成指向空函数
     //依次安装函数指针
     gd->jt[XF_get_version] = (void *) get_version;
     gd->jt[XF_malloc] = (void *) malloc;
     gd->jt[XF_free] = (void *) free;
     gd->jt[XF_getenv] = (void *) getenv;
     gd->jt[XF_setenv] = (void *) setenv;
     gd->jt[XF_get_timer] = (void *) get_timer;
     gd->jt[XF_simple_strtoul] = (void *) simple_strtoul;
     gd->jt[XF_udelay] = (void *) udelay;
 #if defined(CONFIG_I386) || defined(CONFIG_PPC)
     gd->jt[XF_install_hdlr] = (void *) irq_install_handler;
     gd->jt[XF_free_hdlr] = (void *) irq_free_handler;
 #endif    /* I386 || PPC */
 #if (CONFIG_COMMANDS & CFG_CMD_I2C)
     gd->jt[XF_i2c_write] = (void *) i2c_write;
     gd->jt[XF_i2c_read] = (void *) i2c_read;
 #endif    /* CFG_CMD_I2C */
 }