86 lines
2.1 KiB
C
86 lines
2.1 KiB
C
/*
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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) 2006, 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://openlab.rt-thread.com/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2008-12-11 XuXinming first version
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* 2013-05-24 Grissiom port to RM48x50
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*/
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#include <rtthread.h>
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#include "RM48x50.h"
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/**
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* @addtogroup RM48x50
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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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unsigned long *stk;
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stk = (unsigned long*)stack_addr;
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*( stk) = (unsigned long) tentry; /* entry point */
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*(--stk) = (unsigned long) 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) = (unsigned long)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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#ifdef __TI_VFP_SUPPORT__
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#ifndef RT_VFP_LAZY_STACKING
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{
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#define VFP_DATA_NR 32
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int i;
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for (i = 0; i < VFP_DATA_NR; i++)
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{
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*(--stk) = 0;
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}
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/* FPSCR TODO: do we need to set the values other than 0? */
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*(--stk) = 0;
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/* FPEXC. Enable the FVP if no lazy stacking. */
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*(--stk) = 0x40000000;
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}
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#else
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/* FPEXC. Disable the FVP by default. */
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*(--stk) = 0x00000000;
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#endif
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#endif
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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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