91 lines
1.9 KiB
C
91 lines
1.9 KiB
C
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/*
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* File : cpu.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006 - 2011, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2010-05-17 swkyer first version
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*/
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#include <rtthread.h>
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#include <rthw.h>
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#include "../common/exception.h"
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#include "../common/mipsregs.h"
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/**
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* @addtogroup Loongson
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*/
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/*@{*/
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/**
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* exception handle table
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*/
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#define RT_EXCEPTION_MAX 8
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exception_func_t sys_exception_handlers[RT_EXCEPTION_MAX];
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/**
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* setup the exception handle
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*/
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exception_func_t rt_set_except_vector(int n, exception_func_t func)
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{
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exception_func_t old_handler = sys_exception_handlers[n];
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if ((n == 0) || (n > RT_EXCEPTION_MAX) || (!func))
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{
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return 0;
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}
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sys_exception_handlers[n] = func;
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return old_handler;
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}
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void tlb_refill_handler(void)
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{
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rt_kprintf("tlb-miss happens, epc: 0x%08x\n", read_c0_epc());
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rt_hw_cpu_shutdown();
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}
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void cache_error_handler(void)
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{
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rt_kprintf("cache exception happens, epc: 0x%08x\n", read_c0_epc());
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rt_hw_cpu_shutdown();
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}
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static void unhandled_exception_handle(pt_regs_t *regs)
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{
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rt_kprintf("exception happens, epc: 0x%08x, cause: 0x%08x\n", regs->cp0_epc, read_c0_cause());
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}
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void install_default_execpt_handle(void)
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{
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rt_int32_t i;
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for (i=0; i<RT_EXCEPTION_MAX; i++)
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sys_exception_handlers[i] = (exception_func_t)unhandled_exception_handle;
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}
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void exception_handler(pt_regs_t *regs)
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{
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rt_uint32_t cause;
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rt_uint32_t index;
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cause = (read_c0_cause() & read_c0_config());
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cause = (cause & 0xfc00) >> 8;
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for (index = RT_EXCEPTION_MAX; index > 0; index --)
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{
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if (cause & (1 << index))
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{
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sys_exception_handlers[index](regs);
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cause &= ~(1 << index);
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}
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}
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}
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/*@}*/
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