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 * 2018/10/01 Bernard The first version
9 * 2018/12/27 Jesven Change irq enable/disable to cpu0
10 */
11 #include <plic.h>
12 #include <mmu.h>
13 #include "tick.h"
14 #include "encoding.h"
15 #include "riscv.h"
16 #include "interrupt.h"
17
18 struct rt_irq_desc irq_desc[MAX_HANDLERS];
19
rt_hw_interrupt_handle(rt_uint32_t vector,void * param)20 static rt_isr_handler_t rt_hw_interrupt_handle(rt_uint32_t vector, void *param)
21 {
22 rt_kprintf("UN-handled interrupt %d occurred!!!\n", vector);
23 return RT_NULL;
24 }
25
rt_hw_plic_irq_enable(int irq_number)26 int rt_hw_plic_irq_enable(int irq_number)
27 {
28 plic_irq_enable(irq_number);
29 return 0;
30 }
31
rt_hw_plic_irq_disable(int irq_number)32 int rt_hw_plic_irq_disable(int irq_number)
33 {
34 plic_irq_disable(irq_number);
35 return 0;
36 }
37
38 /**
39 * This function will un-mask a interrupt.
40 * @param vector the interrupt number
41 */
rt_hw_interrupt_umask(int vector)42 void rt_hw_interrupt_umask(int vector)
43 {
44 plic_set_priority(vector, 1);
45
46 rt_hw_plic_irq_enable(vector);
47 }
48
49 /**
50 * This function will install a interrupt service routine to a interrupt.
51 * @param vector the interrupt number
52 * @param new_handler the interrupt service routine to be installed
53 * @param old_handler the old interrupt service routine
54 */
rt_hw_interrupt_install(int vector,rt_isr_handler_t handler,void * param,const char * name)55 rt_isr_handler_t rt_hw_interrupt_install(int vector, rt_isr_handler_t handler,
56 void *param, const char *name)
57 {
58 rt_isr_handler_t old_handler = RT_NULL;
59
60 if(vector < MAX_HANDLERS)
61 {
62 old_handler = irq_desc[vector].handler;
63 if (handler != RT_NULL)
64 {
65 irq_desc[vector].handler = (rt_isr_handler_t)handler;
66 irq_desc[vector].param = param;
67 #ifdef RT_USING_INTERRUPT_INFO
68 rt_snprintf(irq_desc[vector].name, RT_NAME_MAX - 1, "%s", name);
69 irq_desc[vector].counter = 0;
70 #endif
71 }
72 }
73
74 return old_handler;
75 }
76
rt_hw_interrupt_init()77 void rt_hw_interrupt_init()
78 {
79 /* Enable machine external interrupts. */
80 // set_csr(sie, SIP_SEIP);
81 int idx = 0;
82 /* init exceptions table */
83 for (idx = 0; idx < MAX_HANDLERS; idx++)
84 {
85 irq_desc[idx].handler = (rt_isr_handler_t)rt_hw_interrupt_handle;
86 irq_desc[idx].param = RT_NULL;
87 #ifdef RT_USING_INTERRUPT_INFO
88 rt_snprintf(irq_desc[idx].name, RT_NAME_MAX - 1, "default");
89 irq_desc[idx].counter = 0;
90 #endif
91 }
92
93 plic_set_threshold(0);
94 }
95