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
1 void jumptable_init (void) 2 { 3 int i; 4 5 gd->jt = (void **) malloc (XF_MAX * sizeof (void *)); //在堆中开辟指针空间 6 for (i = 0; i < XF_MAX; i++) 7 gd->jt[i] = (void *) dummy; //指针空间都初始化成指向空函数 8 //依次安装函数指针 9 gd->jt[XF_get_version] = (void *) get_version; 10 gd->jt[XF_malloc] = (void *) malloc; 11 gd->jt[XF_free] = (void *) free; 12 gd->jt[XF_getenv] = (void *) getenv; 13 gd->jt[XF_setenv] = (void *) setenv; 14 gd->jt[XF_get_timer] = (void *) get_timer; 15 gd->jt[XF_simple_strtoul] = (void *) simple_strtoul; 16 gd->jt[XF_udelay] = (void *) udelay; 17 #if defined(CONFIG_I386) || defined(CONFIG_PPC) 18 gd->jt[XF_install_hdlr] = (void *) irq_install_handler; 19 gd->jt[XF_free_hdlr] = (void *) irq_free_handler; 20 #endif /* I386 || PPC */ 21 #if (CONFIG_COMMANDS & CFG_CMD_I2C) 22 gd->jt[XF_i2c_write] = (void *) i2c_write; 23 gd->jt[XF_i2c_read] = (void *) i2c_read; 24 #endif /* CFG_CMD_I2C */ 25 }