1*10465441SEvalZero /*
2*10465441SEvalZero * File : cpuport.c
3*10465441SEvalZero * This file is part of RT-Thread RTOS
4*10465441SEvalZero * COPYRIGHT (C) 2009 - 2011, RT-Thread Development Team
5*10465441SEvalZero *
6*10465441SEvalZero * The license and distribution terms for this file may be
7*10465441SEvalZero * found in the file LICENSE in this distribution or at
8*10465441SEvalZero * http://www.rt-thread.org/license/LICENSE
9*10465441SEvalZero *
10*10465441SEvalZero * Change Logs:
11*10465441SEvalZero * Date Author Notes
12*10465441SEvalZero * 20011-05-23 aozima the first version for PIC32.
13*10465441SEvalZero * 20011-09-05 aozima merge all of C source code into cpuport.c.
14*10465441SEvalZero */
15*10465441SEvalZero #include <rtthread.h>
16*10465441SEvalZero
17*10465441SEvalZero /**
18*10465441SEvalZero * @addtogroup PIC32
19*10465441SEvalZero */
20*10465441SEvalZero /*@{*/
21*10465441SEvalZero
22*10465441SEvalZero /* exception and interrupt handler table */
23*10465441SEvalZero rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
24*10465441SEvalZero rt_uint32_t rt_thread_switch_interrupt_flag;
25*10465441SEvalZero
_get_gp(void)26*10465441SEvalZero rt_uint32_t __attribute__((nomips16)) _get_gp(void)
27*10465441SEvalZero {
28*10465441SEvalZero rt_uint32_t result;
29*10465441SEvalZero
30*10465441SEvalZero // get the gp reg
31*10465441SEvalZero asm volatile("move %0, $28" : "=r"(result));
32*10465441SEvalZero
33*10465441SEvalZero return result;
34*10465441SEvalZero }
35*10465441SEvalZero
36*10465441SEvalZero /**
37*10465441SEvalZero * This function will initialize thread stack
38*10465441SEvalZero *
39*10465441SEvalZero * @param tentry the entry of thread
40*10465441SEvalZero * @param parameter the parameter of entry
41*10465441SEvalZero * @param stack_addr the beginning stack address
42*10465441SEvalZero * @param texit the function will be called when thread exit
43*10465441SEvalZero *
44*10465441SEvalZero * @return stack address
45*10465441SEvalZero */
rt_hw_stack_init(void * tentry,void * parameter,rt_uint8_t * stack_addr,void * texit)46*10465441SEvalZero rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter, rt_uint8_t *stack_addr, void *texit)
47*10465441SEvalZero {
48*10465441SEvalZero rt_uint32_t *stk;
49*10465441SEvalZero
50*10465441SEvalZero /** Start at stack top */
51*10465441SEvalZero stk = (rt_uint32_t *)stack_addr;
52*10465441SEvalZero *(stk) = (rt_uint32_t) tentry; /* pc: Entry Point */
53*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x00800000; /* c0_cause: IV=1, */
54*10465441SEvalZero *(--stk) = (rt_uint32_t) 0; /* c0_badvaddr */
55*10465441SEvalZero *(--stk) = (rt_uint32_t) 0; /* lo */
56*10465441SEvalZero *(--stk) = (rt_uint32_t) 0; /* hi */
57*10465441SEvalZero *(--stk) = (rt_uint32_t) 1; /* C0_SR: IE = En, */
58*10465441SEvalZero *(--stk) = (rt_uint32_t) texit; /* 31 ra */
59*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x0000001e; /* 30 s8 */
60*10465441SEvalZero *(--stk) = (rt_uint32_t) stack_addr; /* 29 sp */
61*10465441SEvalZero *(--stk) = (rt_uint32_t) _get_gp(); /* 28 gp */
62*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x0000001b; /* 27 k1 */
63*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x0000001a; /* 26 k0 */
64*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x00000019; /* 25 t9 */
65*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x00000018; /* 24 t8 */
66*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x00000017; /* 23 s7 */
67*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x00000016; /* 22 s6 */
68*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x00000015; /* 21 s5 */
69*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x00000014; /* 20 s4 */
70*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x00000013; /* 19 s3 */
71*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x00000012; /* 18 s2 */
72*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x00000011; /* 17 s1 */
73*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x00000010; /* 16 s0 */
74*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x0000000f; /* 15 t7 */
75*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x0000000e; /* 14 t6 */
76*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x0000000d; /* 13 t5 */
77*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x0000000c; /* 12 t4 */
78*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x0000000b; /* 11 t3 */
79*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x0000000a; /* 10 t2 */
80*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x00000009; /* 9 t1 */
81*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x00000008; /* 8 t0 */
82*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x00000007; /* 7 a3 */
83*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x00000006; /* 6 a2 */
84*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x00000005; /* 5 a1 */
85*10465441SEvalZero *(--stk) = (rt_uint32_t) parameter; /* 4 a0 */
86*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x00000003; /* 3 v1 */
87*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x00000002; /* 2 v0 */
88*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x00000001; /* 1 at */
89*10465441SEvalZero *(--stk) = (rt_uint32_t) 0x00000000; /* 0 zero */
90*10465441SEvalZero
91*10465441SEvalZero /* return task's current stack address */
92*10465441SEvalZero return (rt_uint8_t *)stk;
93*10465441SEvalZero }
94*10465441SEvalZero
95*10465441SEvalZero
96*10465441SEvalZero /*@}*/
97