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