1 /*
2 * Copyright (c) 2006-2021, RT-Thread Development Team
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 *
6 * Change Logs:
7 * Date Author Notes
8 * 2021-10-19 JasonHu first version
9 */
10
11 #include <rthw.h>
12 #include <rtthread.h>
13
14 #include "interrupt.h"
15 #include "riscv.h"
16 #include "plic.h"
17
18 extern rt_atomic_t rt_interrupt_nest;
19 extern rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
20 extern rt_uint32_t rt_thread_switch_interrupt_flag;
21
22 struct rt_irq_desc isr_table[INTERRUPTS_MAX];
23
rt_hw_interrupt_handler(int vector,void * param)24 static void rt_hw_interrupt_handler(int vector, void *param)
25 {
26 rt_kprintf("Unhandled interrupt %d occured!!!\n", vector);
27 }
28
29 /**
30 * This function will initialize hardware interrupt
31 */
rt_hw_interrupt_init(void)32 void rt_hw_interrupt_init(void)
33 {
34 /* init interrupt controller */
35 plic_init();
36
37 rt_int32_t idx;
38
39 rt_memset(isr_table, 0x00, sizeof(isr_table));
40 for (idx = 0; idx < INTERRUPTS_MAX; idx++)
41 {
42 isr_table[idx].handler = rt_hw_interrupt_handler;
43 }
44
45 /* init interrupt nest, and context in thread sp */
46 rt_interrupt_nest = 0;
47 rt_interrupt_from_thread = 0;
48 rt_interrupt_to_thread = 0;
49 rt_thread_switch_interrupt_flag = 0;
50 }
51
52 /**
53 * This function will mask a interrupt.
54 * @param vector the interrupt number
55 */
rt_hw_interrupt_mask(int vector)56 void rt_hw_interrupt_mask(int vector)
57 {
58 if ((vector < 0) || (vector > IRQ_MAX_NR))
59 {
60 return;
61 }
62 plic_disable_irq(vector);
63 }
64
65 /**
66
67 * This function will un-mask a interrupt.
68 * @param vector the interrupt number
69 */
rt_hw_interrupt_umask(int vector)70 void rt_hw_interrupt_umask(int vector)
71 {
72 if ((vector < 0) || (vector > IRQ_MAX_NR))
73 {
74 return;
75 }
76 plic_enable_irq(vector);
77 }
78
79 /**
80 * This function will install a interrupt service routine to a interrupt.
81 * @param vector the interrupt number
82 * @param handler the interrupt service routine to be installed
83 * @param param the interrupt service function parameter
84 * @param name the interrupt name
85 * @return old handler
86 */
rt_hw_interrupt_install(int vector,rt_isr_handler_t handler,void * param,const char * name)87 rt_isr_handler_t rt_hw_interrupt_install(int vector, rt_isr_handler_t handler,
88 void *param, const char *name)
89 {
90 rt_isr_handler_t old_handler = RT_NULL;
91 if ((vector < 0) || (vector > IRQ_MAX_NR))
92 {
93 return old_handler;
94 }
95
96 old_handler = isr_table[IRQ_OFFSET + vector].handler;
97
98 #ifdef RT_USING_INTERRUPT_INFO
99 rt_strncpy(isr_table[IRQ_OFFSET + vector].name, name, RT_NAME_MAX);
100 #endif /* RT_USING_INTERRUPT_INFO */
101 isr_table[IRQ_OFFSET + vector].handler = handler;
102 isr_table[IRQ_OFFSET + vector].param = param;
103
104 return old_handler;
105 }
106