1*10465441SEvalZero /*
2*10465441SEvalZero * File : stack.c
3*10465441SEvalZero * This file is part of RT-Thread RTOS
4*10465441SEvalZero * COPYRIGHT (C) 2006 - 2013, RT-Thread Development Team
5*10465441SEvalZero *
6*10465441SEvalZero * This program is free software; you can redistribute it and/or modify
7*10465441SEvalZero * it under the terms of the GNU General Public License as published by
8*10465441SEvalZero * the Free Software Foundation; either version 2 of the License, or
9*10465441SEvalZero * (at your option) any later version.
10*10465441SEvalZero *
11*10465441SEvalZero * This program is distributed in the hope that it will be useful,
12*10465441SEvalZero * but WITHOUT ANY WARRANTY; without even the implied warranty of
13*10465441SEvalZero * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14*10465441SEvalZero * GNU General Public License for more details.
15*10465441SEvalZero *
16*10465441SEvalZero * You should have received a copy of the GNU General Public License along
17*10465441SEvalZero * with this program; if not, write to the Free Software Foundation, Inc.,
18*10465441SEvalZero * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19*10465441SEvalZero *
20*10465441SEvalZero * Change Logs:
21*10465441SEvalZero * Date Author Notes
22*10465441SEvalZero * 2013-7-14 Peng Fan sep6200 implementation
23*10465441SEvalZero */
24*10465441SEvalZero
25*10465441SEvalZero #include <rtthread.h>
26*10465441SEvalZero #include <sep6200.h>
27*10465441SEvalZero
28*10465441SEvalZero /**
29*10465441SEvalZero * @addtogroup sep6200
30*10465441SEvalZero */
31*10465441SEvalZero /*@{*/
32*10465441SEvalZero
33*10465441SEvalZero /**
34*10465441SEvalZero * This function will initialize thread stack
35*10465441SEvalZero *
36*10465441SEvalZero * @param tentry the entry of thread
37*10465441SEvalZero * @param parameter the parameter of entry
38*10465441SEvalZero * @param stack_addr the beginning stack address
39*10465441SEvalZero * @param texit the function will be called when thread exit
40*10465441SEvalZero *
41*10465441SEvalZero * @return stack address
42*10465441SEvalZero */
43*10465441SEvalZero
rt_hw_stack_init(void * tentry,void * parameter,rt_uint8_t * stack_addr,void * texit)44*10465441SEvalZero rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter,
45*10465441SEvalZero rt_uint8_t *stack_addr, void *texit)
46*10465441SEvalZero {
47*10465441SEvalZero rt_uint32_t *stk;
48*10465441SEvalZero
49*10465441SEvalZero stk = (rt_uint32_t*)stack_addr;
50*10465441SEvalZero *(stk) = (rt_uint32_t)tentry; /* entry point */
51*10465441SEvalZero *(--stk) = (rt_uint32_t)texit; /* lr */
52*10465441SEvalZero *(--stk) = 0; /* r28 */
53*10465441SEvalZero *(--stk) = 0; /* r27 */
54*10465441SEvalZero *(--stk) = 0; /* r26 */
55*10465441SEvalZero *(--stk) = 0; /* r25 */
56*10465441SEvalZero *(--stk) = 0; /* r24 */
57*10465441SEvalZero *(--stk) = 0; /* r23 */
58*10465441SEvalZero *(--stk) = 0; /* r22 */
59*10465441SEvalZero *(--stk) = 0; /* r21 */
60*10465441SEvalZero *(--stk) = 0; /* r20 */
61*10465441SEvalZero *(--stk) = 0; /* r19 */
62*10465441SEvalZero *(--stk) = 0; /* r18 */
63*10465441SEvalZero *(--stk) = 0; /* r17 */
64*10465441SEvalZero *(--stk) = 0; /* r16 */
65*10465441SEvalZero *(--stk) = 0; /* r15 */
66*10465441SEvalZero *(--stk) = 0; /* r14 */
67*10465441SEvalZero *(--stk) = 0; /* r13 */
68*10465441SEvalZero *(--stk) = 0; /* r12 */
69*10465441SEvalZero *(--stk) = 0; /* r11 */
70*10465441SEvalZero *(--stk) = 0; /* r10 */
71*10465441SEvalZero *(--stk) = 0; /* r9 */
72*10465441SEvalZero *(--stk) = 0; /* r8 */
73*10465441SEvalZero *(--stk) = 0; /* r7 */
74*10465441SEvalZero *(--stk) = 0; /* r6 */
75*10465441SEvalZero *(--stk) = 0; /* r5 */
76*10465441SEvalZero *(--stk) = 0; /* r4 */
77*10465441SEvalZero *(--stk) = 0; /* r3 */
78*10465441SEvalZero *(--stk) = 0; /* r2 */
79*10465441SEvalZero *(--stk) = 0; /* r1 */
80*10465441SEvalZero *(--stk) = (rt_uint32_t)parameter; /* r0 : argument */
81*10465441SEvalZero *(--stk) = Mode_PRIV; /* asr */
82*10465441SEvalZero *(--stk) = Mode_PRIV; /* bsr */ /*why both PRIV do not need switch?*/
83*10465441SEvalZero
84*10465441SEvalZero /* return task's current stack address */
85*10465441SEvalZero return (rt_uint8_t *)stk;
86*10465441SEvalZero }
87*10465441SEvalZero
88*10465441SEvalZero /*@}*/
89