1 /* 2 * File : stack.c 3 * This file is part of RT-Thread RTOS 4 * COPYRIGHT (C) 2006 - 2013, RT-Thread Development Team 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License along 17 * with this program; if not, write to the Free Software Foundation, Inc., 18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Change Logs: 21 * Date Author Notes 22 * 2013-7-14 Peng Fan sep6200 implementation 23 */ 24 25 #include <rtthread.h> 26 #include <sep6200.h> 27 28 /** 29 * @addtogroup sep6200 30 */ 31 /*@{*/ 32 33 /** 34 * This function will initialize thread stack 35 * 36 * @param tentry the entry of thread 37 * @param parameter the parameter of entry 38 * @param stack_addr the beginning stack address 39 * @param texit the function will be called when thread exit 40 * 41 * @return stack address 42 */ 43 44 rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter, 45 rt_uint8_t *stack_addr, void *texit) 46 { 47 rt_uint32_t *stk; 48 49 stk = (rt_uint32_t*)stack_addr; 50 *(stk) = (rt_uint32_t)tentry; /* entry point */ 51 *(--stk) = (rt_uint32_t)texit; /* lr */ 52 *(--stk) = 0; /* r28 */ 53 *(--stk) = 0; /* r27 */ 54 *(--stk) = 0; /* r26 */ 55 *(--stk) = 0; /* r25 */ 56 *(--stk) = 0; /* r24 */ 57 *(--stk) = 0; /* r23 */ 58 *(--stk) = 0; /* r22 */ 59 *(--stk) = 0; /* r21 */ 60 *(--stk) = 0; /* r20 */ 61 *(--stk) = 0; /* r19 */ 62 *(--stk) = 0; /* r18 */ 63 *(--stk) = 0; /* r17 */ 64 *(--stk) = 0; /* r16 */ 65 *(--stk) = 0; /* r15 */ 66 *(--stk) = 0; /* r14 */ 67 *(--stk) = 0; /* r13 */ 68 *(--stk) = 0; /* r12 */ 69 *(--stk) = 0; /* r11 */ 70 *(--stk) = 0; /* r10 */ 71 *(--stk) = 0; /* r9 */ 72 *(--stk) = 0; /* r8 */ 73 *(--stk) = 0; /* r7 */ 74 *(--stk) = 0; /* r6 */ 75 *(--stk) = 0; /* r5 */ 76 *(--stk) = 0; /* r4 */ 77 *(--stk) = 0; /* r3 */ 78 *(--stk) = 0; /* r2 */ 79 *(--stk) = 0; /* r1 */ 80 *(--stk) = (rt_uint32_t)parameter; /* r0 : argument */ 81 *(--stk) = Mode_PRIV; /* asr */ 82 *(--stk) = Mode_PRIV; /* bsr */ /*why both PRIV do not need switch?*/ 83 84 /* return task's current stack address */ 85 return (rt_uint8_t *)stk; 86 } 87 88 /*@}*/ 89