100 lines
2.2 KiB
C
100 lines
2.2 KiB
C
/*
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* Copyright (C) 2012 Antony Pavlov <antonynpavlov@gmail.com>
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*
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* This file is part of barebox.
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* See file CREDITS for list of people who contributed to this project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <common.h>
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#include <string.h>
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#include <memory.h>
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#include <asm-generic/memory_layout.h>
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#include <asm/sections.h>
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#include <asm/cpu-features.h>
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#include <asm/mipsregs.h>
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#include <asm/addrspace.h>
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extern void start_barebox(void);
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extern void handle_reserved(void);
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void main_entry(void);
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unsigned long exception_handlers[32];
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static void set_except_vector(int n, void *addr)
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{
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unsigned handler = (unsigned long) addr;
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exception_handlers[n] = handler;
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}
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static void trap_init(void)
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{
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extern char except_vec3_generic;
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int i;
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unsigned long ebase;
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ebase = CKSEG1;
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/*
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* Copy the generic exception handlers to their final destination.
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* This will be overriden later as suitable for a particular
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* configuration.
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*/
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memcpy((void *)(ebase + 0x180), &except_vec3_generic, 0x80);
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/*
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* Setup default vectors
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*/
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for (i = 0; i <= 31; i++) {
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set_except_vector(i, &handle_reserved);
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}
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if (!cpu_has_4kex)
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memcpy((void *)(ebase + 0x080), &except_vec3_generic, 0x80);
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/* FIXME: handle tlb */
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memcpy((void *)(ebase), &except_vec3_generic, 0x80);
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/* unset BOOT EXCEPTION VECTOR bit */
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write_c0_status(read_c0_status() & ~ST0_BEV);
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}
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/**
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* Called plainly from assembler code
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*
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* @note The C environment isn't initialized yet
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*/
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void main_entry(void)
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{
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/* clear the BSS first */
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memset(__bss_start, 0x00, __bss_stop - __bss_start);
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cpu_probe();
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if (cpu_has_4k_cache) {
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extern void r4k_cache_init(void);
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r4k_cache_init();
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}
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trap_init();
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mem_malloc_init((void *)MALLOC_BASE,
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(void *)(MALLOC_BASE + MALLOC_SIZE - 1));
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start_barebox();
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}
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