67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
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/*
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* File : stack.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2011, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2011-09-23 Bernard the first version
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* 2011-10-05 Bernard add thumb mode
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*/
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#include <rtthread.h>
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#include <board.h>
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#include <armv7.h>
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/**
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* @addtogroup AM33xx
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*/
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/*@{*/
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/**
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* This function will initialize thread stack
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*
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* @param tentry the entry of thread
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* @param parameter the parameter of entry
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* @param stack_addr the beginning stack address
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* @param texit the function will be called when thread exit
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*
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* @return stack address
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*/
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rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter,
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rt_uint8_t *stack_addr, void *texit)
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{
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rt_uint32_t *stk;
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stk = (rt_uint32_t*)stack_addr;
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*(stk) = (rt_uint32_t)tentry; /* entry point */
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*(--stk) = (rt_uint32_t)texit; /* lr */
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*(--stk) = 0; /* r12 */
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*(--stk) = 0; /* r11 */
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*(--stk) = 0; /* r10 */
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*(--stk) = 0; /* r9 */
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*(--stk) = 0; /* r8 */
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*(--stk) = 0; /* r7 */
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*(--stk) = 0; /* r6 */
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*(--stk) = 0; /* r5 */
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*(--stk) = 0; /* r4 */
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*(--stk) = 0; /* r3 */
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*(--stk) = 0; /* r2 */
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*(--stk) = 0; /* r1 */
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*(--stk) = (rt_uint32_t)parameter; /* r0 : argument */
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/* cpsr */
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if ((rt_uint32_t)tentry & 0x01)
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*(--stk) = SVCMODE | 0x20; /* thumb mode */
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else
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*(--stk) = SVCMODE; /* arm mode */
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/* return task's current stack address */
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return (rt_uint8_t *)stk;
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}
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/*@}*/
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