1 /* 2 * File : stack.c 3 * This file is part of RT-Thread RTOS 4 * COPYRIGHT (C) 2006, RT-Thread Development Team 5 * 6 * The license and distribution terms for this file may be 7 * found in the file LICENSE in this distribution or at 8 * http://openlab.rt-thread.com/license/LICENSE 9 * 10 * Change Logs: 11 * Date Author Notes 12 */ 13 14 #include <rtthread.h> 15 16 #include <i386.h> 17 18 /** 19 * @addtogroup I386 20 */ 21 /*@{*/ 22 23 /** 24 * This function will initialize thread stack 25 * 26 * @param tentry the entry of thread 27 * @param parameter the parameter of entry 28 * @param stack_addr the beginning stack address 29 * @param texit the function will be called when thread exit 30 * 31 * @return stack address 32 */ 33 rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter, 34 rt_uint8_t *stack_addr, void *texit) 35 { 36 unsigned long *stk; 37 38 stk = (unsigned long *)stack_addr; 39 *(--stk) = (unsigned long)parameter; 40 *(--stk) = (unsigned long)texit; 41 *(--stk) = 0x200; /*flags*/ 42 *(--stk) = 0x08; /*cs*/ 43 *(--stk) = (unsigned long)tentry; /*eip*/ 44 *(--stk) = 0; /*irqno*/ 45 *(--stk) = 0x10; /*ds*/ 46 *(--stk) = 0x10; /*es*/ 47 *(--stk) = 0; /*eax*/ 48 *(--stk) = 0; /*ecx*/ 49 *(--stk) = 0; /*edx*/ 50 *(--stk) = 0; /*ebx*/ 51 *(--stk) = 0; /*esp*/ 52 *(--stk) = 0; /*ebp*/ 53 *(--stk) = 0; /*esi*/ 54 *(--stk) = 0; /*edi*/ 55 56 /* return task's current stack address */ 57 return (rt_uint8_t *)stk; 58 } 59 /*@}*/ 60