1 /* 2 * Copyright (c) 2006-2018, RT-Thread Development Team 3 * 4 * SPDX-License-Identifier: Apache-2.0 5 * 6 * Change Logs: 7 * Date Author Notes 8 * 2006-03-13 Bernard the first version 9 */ 10 #include <rtthread.h> 11 #include <sep4020.h> 12 /** 13 * @addtogroup S3C24X0 14 */ 15 /*@{*/ 16 17 /** 18 * This function will initialize thread stack 19 * 20 * @param tentry the entry of thread 21 * @param parameter the parameter of entry 22 * @param stack_addr the beginning stack address 23 * @param texit the function will be called when thread exit 24 * 25 * @return stack address 26 */ rt_hw_stack_init(void * tentry,void * parameter,rt_uint8_t * stack_addr,void * texit)27rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter, 28 rt_uint8_t *stack_addr, void *texit) 29 { 30 rt_uint32_t *stk; 31 32 stack_addr += sizeof(rt_uint32_t); 33 stack_addr = (rt_uint8_t *)RT_ALIGN_DOWN((rt_uint32_t)stack_addr, 8); 34 stk = (rt_uint32_t *)stack_addr; 35 *(--stk) = (rt_uint32_t)tentry; /* entry point */ 36 *(--stk) = (rt_uint32_t)texit; /* lr */ 37 *(--stk) = 0xdeadbeef; /* r12 */ 38 *(--stk) = 0xdeadbeef; /* r11 */ 39 *(--stk) = 0xdeadbeef; /* r10 */ 40 *(--stk) = 0xdeadbeef; /* r9 */ 41 *(--stk) = 0xdeadbeef; /* r8 */ 42 *(--stk) = 0xdeadbeef; /* r7 */ 43 *(--stk) = 0xdeadbeef; /* r6 */ 44 *(--stk) = 0xdeadbeef; /* r5 */ 45 *(--stk) = 0xdeadbeef; /* r4 */ 46 *(--stk) = 0xdeadbeef; /* r3 */ 47 *(--stk) = 0xdeadbeef; /* r2 */ 48 *(--stk) = 0xdeadbeef; /* r1 */ 49 *(--stk) = (rt_uint32_t)parameter; /* r0 : argument */ 50 *(--stk) = Mode_SVC; /* cpsr */ 51 *(--stk) = Mode_SVC; /* spsr */ 52 53 /* return task's current stack address */ 54 return (rt_uint8_t *)stk; 55 } 56 57 /*@}*/ 58