2013-01-08 21:05:02 +08:00
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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) 2006-2011, 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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* 2011-02-14 Fred first implementation for
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*/
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#include <rtthread.h>
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/**
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* @addtogroup PowerPC
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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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rt_uint32_t msr;
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__asm__ __volatile__("mfmsr %0\n" : "=r" (msr));
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msr |= 0x00028000;
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stk = (unsigned long *)stack_addr;
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--stk;
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*(--stk) = msr; /* srr0: machine status register */
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*(--stk) = (rt_uint32_t)tentry; /* srr1: entry point */
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*(--stk) = (rt_uint32_t)texit; /* lr: link register */
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*(--stk) = 0x0F0F0F0F; /* ctr: counter register */
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*(--stk) = 0x0F0F0F0F; /* xer: fixed-point exception register */
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*(--stk) = 0x0F0F0F0F; /* cr : condition register */
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*(--stk) = 0x00; /* usprg0 */
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*(--stk) = 0x31; /* r31 */
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*(--stk) = 0x30; /* r30 */
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*(--stk) = 0x29; /* r29 */
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*(--stk) = 0x28; /* r28 */
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*(--stk) = 0x27; /* r27 */
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*(--stk) = 0x26; /* r26 */
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*(--stk) = 0x25; /* r25 */
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*(--stk) = 0x24; /* r24 */
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*(--stk) = 0x23; /* r23 */
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*(--stk) = 0x22; /* r22 */
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*(--stk) = 0x21; /* r21 */
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*(--stk) = 0x20; /* r20 */
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*(--stk) = 0x19; /* r19 */
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*(--stk) = 0x18; /* r18 */
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*(--stk) = 0x17; /* r17 */
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*(--stk) = 0x16; /* r16 */
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*(--stk) = 0x15; /* r15 */
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*(--stk) = 0x14; /* r14 */
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*(--stk) = 0x13; /* r13: thread id */
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*(--stk) = 0x12; /* r12 */
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*(--stk) = 0x11; /* r11 */
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*(--stk) = 0x10; /* r10 */
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*(--stk) = 0x09; /* r09 */
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*(--stk) = 0x08; /* r08 */
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*(--stk) = 0x07; /* r07 */
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*(--stk) = 0x06; /* r06 */
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*(--stk) = 0x05; /* r05 */
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*(--stk) = 0x04; /* r04 */
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*(--stk) = (rt_uint32_t)parameter; /* r03: parameter and return */
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*(--stk) = 0x02; /* r02: toc */
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/* r01: sp */
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*(--stk) = 0x0; /* r00 */
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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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