1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2016-17 Microsemi Corporation.
* Padmarao Begari, Microsemi Corporation <padmarao.begari@microsemi.com>
*
* Copyright (C) 2017 Andes Technology Corporation
* Rick Chen, Andes Technology Corporation <rick@andestech.com>
*/
#include <common.h>
#include <irq_func.h>
#include <asm/ptrace.h>
#include <asm/system.h>
#include <asm/encoding.h>
static void _exit_trap(ulong code, ulong epc, struct pt_regs *regs)
{
static const char * const exception_code[] = {
"Instruction address misaligned",
"Instruction access fault",
"Illegal instruction",
"Breakpoint",
"Load address misaligned",
"Load access fault",
"Store/AMO address misaligned",
"Store/AMO access fault",
"Environment call from U-mode",
"Environment call from S-mode",
"Reserved",
"Environment call from M-mode",
"Instruction page fault",
"Load page fault",
"Reserved",
"Store/AMO page fault",
};
if (code < ARRAY_SIZE(exception_code)) {
printf("exception code: %ld , %s , epc %lx , ra %lx\n",
code, exception_code[code], epc, regs->ra);
} else {
printf("reserved exception code: %ld , epc %lx , ra %lx\n",
code, epc, regs->ra);
}
hang();
}
int interrupt_init(void)
{
return 0;
}
/*
* enable interrupts
*/
void enable_interrupts(void)
{
}
/*
* disable interrupts
*/
int disable_interrupts(void)
{
return 0;
}
ulong handle_trap(ulong cause, ulong epc, struct pt_regs *regs)
{
ulong is_irq, irq;
is_irq = (cause & MCAUSE_INT);
irq = (cause & ~MCAUSE_INT);
if (is_irq) {
switch (irq) {
case IRQ_M_EXT:
case IRQ_S_EXT:
external_interrupt(0); /* handle external interrupt */
break;
case IRQ_M_TIMER:
case IRQ_S_TIMER:
timer_interrupt(0); /* handle timer interrupt */
break;
default:
_exit_trap(cause, epc, regs);
break;
};
} else {
_exit_trap(cause, epc, regs);
}
return epc;
}
/*
*Entry Point for PLIC Interrupt Handler
*/
__attribute__((weak)) void external_interrupt(struct pt_regs *regs)
{
}
__attribute__((weak)) void timer_interrupt(struct pt_regs *regs)
{
}
|
