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 * 2018/10/28 Bernard The unify RISC-V porting code.
9 */
10
11 #include <rthw.h>
12 #include <rtthread.h>
13
14 #include "cpuport.h"
15
16 #ifndef RT_USING_SMP
17 volatile rt_ubase_t rt_interrupt_from_thread = 0;
18 volatile rt_ubase_t rt_interrupt_to_thread = 0;
19 volatile rt_uint32_t rt_thread_switch_interrupt_flag = 0;
20 #endif
21
22 struct rt_hw_stack_frame
23 {
24 rt_ubase_t epc; /* epc - epc - program counter */
25 rt_ubase_t ra; /* x1 - ra - return address for jumps */
26 rt_ubase_t mstatus; /* - machine status register */
27 rt_ubase_t gp; /* x3 - gp - global pointer */
28 rt_ubase_t tp; /* x4 - tp - thread pointer */
29 rt_ubase_t t0; /* x5 - t0 - temporary register 0 */
30 rt_ubase_t t1; /* x6 - t1 - temporary register 1 */
31 rt_ubase_t t2; /* x7 - t2 - temporary register 2 */
32 rt_ubase_t s0_fp; /* x8 - s0/fp - saved register 0 or frame pointer */
33 rt_ubase_t s1; /* x9 - s1 - saved register 1 */
34 rt_ubase_t a0; /* x10 - a0 - return value or function argument 0 */
35 rt_ubase_t a1; /* x11 - a1 - return value or function argument 1 */
36 rt_ubase_t a2; /* x12 - a2 - function argument 2 */
37 rt_ubase_t a3; /* x13 - a3 - function argument 3 */
38 rt_ubase_t a4; /* x14 - a4 - function argument 4 */
39 rt_ubase_t a5; /* x15 - a5 - function argument 5 */
40 rt_ubase_t a6; /* x16 - a6 - function argument 6 */
41 rt_ubase_t a7; /* x17 - s7 - function argument 7 */
42 rt_ubase_t s2; /* x18 - s2 - saved register 2 */
43 rt_ubase_t s3; /* x19 - s3 - saved register 3 */
44 rt_ubase_t s4; /* x20 - s4 - saved register 4 */
45 rt_ubase_t s5; /* x21 - s5 - saved register 5 */
46 rt_ubase_t s6; /* x22 - s6 - saved register 6 */
47 rt_ubase_t s7; /* x23 - s7 - saved register 7 */
48 rt_ubase_t s8; /* x24 - s8 - saved register 8 */
49 rt_ubase_t s9; /* x25 - s9 - saved register 9 */
50 rt_ubase_t s10; /* x26 - s10 - saved register 10 */
51 rt_ubase_t s11; /* x27 - s11 - saved register 11 */
52 rt_ubase_t t3; /* x28 - t3 - temporary register 3 */
53 rt_ubase_t t4; /* x29 - t4 - temporary register 4 */
54 rt_ubase_t t5; /* x30 - t5 - temporary register 5 */
55 rt_ubase_t t6; /* x31 - t6 - temporary register 6 */
56 };
57
58 /**
59 * This function will initialize thread stack
60 *
61 * @param tentry the entry of thread
62 * @param parameter the parameter of entry
63 * @param stack_addr the beginning stack address
64 * @param texit the function will be called when thread exit
65 *
66 * @return stack address
67 */
rt_hw_stack_init(void * tentry,void * parameter,rt_uint8_t * stack_addr,void * texit)68 rt_uint8_t *rt_hw_stack_init(void *tentry,
69 void *parameter,
70 rt_uint8_t *stack_addr,
71 void *texit)
72 {
73 struct rt_hw_stack_frame *frame;
74 rt_uint8_t *stk;
75 int i;
76
77 stk = stack_addr + sizeof(rt_ubase_t);
78 stk = (rt_uint8_t *)RT_ALIGN_DOWN((rt_ubase_t)stk, REGBYTES);
79 stk -= sizeof(struct rt_hw_stack_frame);
80
81 frame = (struct rt_hw_stack_frame *)stk;
82
83 for (i = 0; i < sizeof(struct rt_hw_stack_frame) / sizeof(rt_ubase_t); i++)
84 {
85 ((rt_ubase_t *)frame)[i] = 0xdeadbeef;
86 }
87
88 frame->ra = (rt_ubase_t)texit;
89 frame->a0 = (rt_ubase_t)parameter;
90 frame->epc = (rt_ubase_t)tentry;
91
92 /* force to machine mode(MPP=11) and set MPIE to 1 */
93 frame->mstatus = 0x00007880;
94
95 return stk;
96 }
97
98 /*
99 * #ifdef RT_USING_SMP
100 * void rt_hw_context_switch_interrupt(void *context, rt_ubase_t from, rt_ubase_t to, struct rt_thread *to_thread);
101 * #else
102 * void rt_hw_context_switch_interrupt(rt_ubase_t from, rt_ubase_t to);
103 * #endif
104 */
105 #ifndef RT_USING_SMP
rt_hw_context_switch_interrupt(rt_ubase_t from,rt_ubase_t to)106 void rt_hw_context_switch_interrupt(rt_ubase_t from, rt_ubase_t to)
107 {
108 if (rt_thread_switch_interrupt_flag == 0)
109 rt_interrupt_from_thread = from;
110
111 rt_interrupt_to_thread = to;
112 rt_thread_switch_interrupt_flag = 1;
113
114 return ;
115 }
116 #endif /* end of RT_USING_SMP */
117
118 /** shutdown CPU */
rt_hw_cpu_shutdown()119 void rt_hw_cpu_shutdown()
120 {
121 rt_uint32_t level;
122 rt_kprintf("shutdown...\n");
123
124 level = rt_hw_interrupt_disable();
125 while (level)
126 {
127 RT_ASSERT(0);
128 }
129 }
130