1*10465441SEvalZero /* 2*10465441SEvalZero * Copyright (c) 2006-2018, RT-Thread Development Team 3*10465441SEvalZero * 4*10465441SEvalZero * SPDX-License-Identifier: Apache-2.0 5*10465441SEvalZero * 6*10465441SEvalZero * Change Logs: 7*10465441SEvalZero * Date Author Notes 8*10465441SEvalZero * 2011-09-23 Bernard the first version 9*10465441SEvalZero * 2011-10-05 Bernard add thumb mode 10*10465441SEvalZero */ 11*10465441SEvalZero #include <rtthread.h> 12*10465441SEvalZero #include "am33xx.h" 13*10465441SEvalZero 14*10465441SEvalZero /** 15*10465441SEvalZero * @addtogroup AM33xx 16*10465441SEvalZero */ 17*10465441SEvalZero /*@{*/ 18*10465441SEvalZero 19*10465441SEvalZero /** 20*10465441SEvalZero * This function will initialize thread stack 21*10465441SEvalZero * 22*10465441SEvalZero * @param tentry the entry of thread 23*10465441SEvalZero * @param parameter the parameter of entry 24*10465441SEvalZero * @param stack_addr the beginning stack address 25*10465441SEvalZero * @param texit the function will be called when thread exit 26*10465441SEvalZero * 27*10465441SEvalZero * @return stack address 28*10465441SEvalZero */ rt_hw_stack_init(void * tentry,void * parameter,rt_uint8_t * stack_addr,void * texit)29*10465441SEvalZerort_uint8_t *rt_hw_stack_init(void *tentry, void *parameter, 30*10465441SEvalZero rt_uint8_t *stack_addr, void *texit) 31*10465441SEvalZero { 32*10465441SEvalZero rt_uint32_t *stk; 33*10465441SEvalZero 34*10465441SEvalZero stack_addr += sizeof(rt_uint32_t); 35*10465441SEvalZero stack_addr = (rt_uint8_t *)RT_ALIGN_DOWN((rt_uint32_t)stack_addr, 8); 36*10465441SEvalZero stk = (rt_uint32_t *)stack_addr; 37*10465441SEvalZero 38*10465441SEvalZero *(--stk) = (rt_uint32_t)tentry; /* entry point */ 39*10465441SEvalZero *(--stk) = (rt_uint32_t)texit; /* lr */ 40*10465441SEvalZero *(--stk) = 0xdeadbeef; /* r12 */ 41*10465441SEvalZero *(--stk) = 0xdeadbeef; /* r11 */ 42*10465441SEvalZero *(--stk) = 0xdeadbeef; /* r10 */ 43*10465441SEvalZero *(--stk) = 0xdeadbeef; /* r9 */ 44*10465441SEvalZero *(--stk) = 0xdeadbeef; /* r8 */ 45*10465441SEvalZero *(--stk) = 0xdeadbeef; /* r7 */ 46*10465441SEvalZero *(--stk) = 0xdeadbeef; /* r6 */ 47*10465441SEvalZero *(--stk) = 0xdeadbeef; /* r5 */ 48*10465441SEvalZero *(--stk) = 0xdeadbeef; /* r4 */ 49*10465441SEvalZero *(--stk) = 0xdeadbeef; /* r3 */ 50*10465441SEvalZero *(--stk) = 0xdeadbeef; /* r2 */ 51*10465441SEvalZero *(--stk) = 0xdeadbeef; /* r1 */ 52*10465441SEvalZero *(--stk) = (rt_uint32_t)parameter; /* r0 : argument */ 53*10465441SEvalZero 54*10465441SEvalZero /* cpsr */ 55*10465441SEvalZero if ((rt_uint32_t)tentry & 0x01) 56*10465441SEvalZero *(--stk) = SVCMODE | 0x20; /* thumb mode */ 57*10465441SEvalZero else 58*10465441SEvalZero *(--stk) = SVCMODE; /* arm mode */ 59*10465441SEvalZero 60*10465441SEvalZero /* return task's current stack address */ 61*10465441SEvalZero return (rt_uint8_t *)stk; 62*10465441SEvalZero } 63*10465441SEvalZero 64*10465441SEvalZero /*@}*/ 65