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/*
* File : stack.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006, RT-Thread Development Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://openlab.rt-thread.com/license/LICENSE
*
* Change Logs:
* Date Author Notes
*/
#include <rtthread.h>
#include <i386.h>
/**
* @addtogroup I386
*/
/*@{*/
/**
* This function will initialize thread stack
*
* @param tentry the entry of thread
* @param parameter the parameter of entry
* @param stack_addr the beginning stack address
* @param texit the function will be called when thread exit
*
* @return stack address
*/
rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter,
rt_uint8_t *stack_addr, void *texit)
{
unsigned long *stk;
stk = (unsigned long *)stack_addr;
*(--stk) = (unsigned long)parameter;
*(--stk) = (unsigned long)texit;
*(--stk) = 0x200; /*flags*/
*(--stk) = 0x08; /*cs*/
*(--stk) = (unsigned long)tentry; /*eip*/
*(--stk) = 0; /*irqno*/
*(--stk) = 0x10; /*ds*/
*(--stk) = 0x10; /*es*/
*(--stk) = 0; /*eax*/
*(--stk) = 0; /*ecx*/
*(--stk) = 0; /*edx*/
*(--stk) = 0; /*ebx*/
*(--stk) = 0; /*esp*/
*(--stk) = 0; /*ebp*/
*(--stk) = 0; /*esi*/
*(--stk) = 0; /*edi*/
/* return task's current stack address */
return (rt_uint8_t *)stk;
}
/*@}*/
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