1 /* 2 * Copyright (c) 2016-17 Microsemi Corporation. 3 * Padmarao Begari, Microsemi Corporation <padmarao.begari@microsemi.com> 4 * 5 * Copyright (C) 2017 Andes Technology Corporation 6 * Rick Chen, Andes Technology Corporation <rick@andestech.com> 7 * 8 * SPDX-License-Identifier: GPL-2.0+ 9 */ 10 11 #include <common.h> 12 #include <asm/ptrace.h> 13 #include <asm/system.h> 14 #include <asm/encoding.h> 15 16 static void _exit_trap(int code, uint epc, struct pt_regs *regs); 17 18 int interrupt_init(void) 19 { 20 return 0; 21 } 22 23 /* 24 * enable interrupts 25 */ 26 void enable_interrupts(void) 27 { 28 } 29 30 /* 31 * disable interrupts 32 */ 33 int disable_interrupts(void) 34 { 35 return 0; 36 } 37 38 uint handle_trap(uint mcause, uint epc, struct pt_regs *regs) 39 { 40 uint is_int; 41 42 is_int = (mcause & MCAUSE_INT); 43 if ((is_int) && ((mcause & MCAUSE_CAUSE) == IRQ_M_EXT)) 44 external_interrupt(0); /* handle_m_ext_interrupt */ 45 else if ((is_int) && ((mcause & MCAUSE_CAUSE) == IRQ_M_TIMER)) 46 timer_interrupt(0); /* handle_m_timer_interrupt */ 47 else 48 _exit_trap(mcause, epc, regs); 49 50 return epc; 51 } 52 53 /* 54 *Entry Point for PLIC Interrupt Handler 55 */ 56 __attribute__((weak)) void external_interrupt(struct pt_regs *regs) 57 { 58 } 59 60 __attribute__((weak)) void timer_interrupt(struct pt_regs *regs) 61 { 62 } 63 64 static void _exit_trap(int code, uint epc, struct pt_regs *regs) 65 { 66 static const char * const exception_code[] = { 67 "Instruction address misaligned", 68 "Instruction access fault", 69 "Illegal instruction", 70 "Breakpoint", 71 "Load address misaligned" 72 }; 73 74 printf("exception code: %d , %s , epc %08x , ra %08lx\n", 75 code, exception_code[code], epc, regs->ra); 76 } 77