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/*
* Copyright (C) 2012 Antony Pavlov <antonynpavlov@gmail.com>
*
* This file is part of barebox.
* See file CREDITS for list of people who contributed to this project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*/
#include <common.h>
#include <string.h>
#include <asm/sections.h>
#include <asm/cpu-features.h>
#include <asm/mipsregs.h>
#include <asm/addrspace.h>
extern void start_barebox(void);
extern void handle_reserved(void);
void main_entry(void);
unsigned long exception_handlers[32];
static void set_except_vector(int n, void *addr)
{
unsigned handler = (unsigned long) addr;
exception_handlers[n] = handler;
}
static void trap_init(void)
{
extern char except_vec3_generic;
int i;
unsigned long ebase;
ebase = CKSEG1;
/*
* Copy the generic exception handlers to their final destination.
* This will be overriden later as suitable for a particular
* configuration.
*/
memcpy((void *)(ebase + 0x180), &except_vec3_generic, 0x80);
/*
* Setup default vectors
*/
for (i = 0; i <= 31; i++) {
set_except_vector(i, &handle_reserved);
}
if (!cpu_has_4kex)
memcpy((void *)(ebase + 0x080), &except_vec3_generic, 0x80);
/* FIXME: handle tlb */
memcpy((void *)(ebase), &except_vec3_generic, 0x80);
/* unset BOOT EXCEPTION VECTOR bit */
write_c0_status(read_c0_status() & ~ST0_BEV);
}
/**
* Called plainly from assembler code
*
* @note The C environment isn't initialized yet
*/
void main_entry(void)
{
/* clear the BSS first */
memset(__bss_start, 0x00, __bss_stop - __bss_start);
cpu_probe();
if (cpu_has_4k_cache) {
extern void r4k_cache_init(void);
r4k_cache_init();
}
trap_init();
start_barebox();
}
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