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/*
* (C) Copyright 2003, Psyent Corporation <www.psyent.com>
* Scott McNutt <smcnutt@psyent.com>
*
* (C) Copyright 2000-2002
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* 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 <devices.h>
#include <watchdog.h>
/*
* All attempts to come up with a "common" initialization sequence
* that works for all boards and architectures failed: some of the
* requirements are just _too_ different. To get rid of the resulting
* mess of board dependend #ifdef'ed code we now make the whole
* initialization sequence configurable to the user.
*
* The requirements for any new initalization function is simple: it
* receives a pointer to the "global data" structure as it's only
* argument, and returns an integer return code, where 0 means
* "continue" and != 0 means "fatal error, hang the system".
*/
extern void malloc_bin_reloc (void);
typedef int (init_fnc_t) (void);
extern unsigned _vectors[];
/*
* Begin and End of memory area for malloc(), and current "brk"
*/
static ulong mem_malloc_start = 0;
static ulong mem_malloc_end = 0;
static ulong mem_malloc_brk = 0;
/*
* The Malloc area is immediately below the monitor copy in RAM
*/
static void mem_malloc_init (void)
{
mem_malloc_start = CFG_MALLOC_BASE;
mem_malloc_end = mem_malloc_start + CFG_MALLOC_LEN;
mem_malloc_brk = mem_malloc_start;
memset ((void *) mem_malloc_start,
0,
mem_malloc_end - mem_malloc_start);
}
void *sbrk (ptrdiff_t increment)
{
ulong old = mem_malloc_brk;
ulong new = old + increment;
if ((new < mem_malloc_start) || (new > mem_malloc_end)) {
return (NULL);
}
mem_malloc_brk = new;
return ((void *) old);
}
/************************************************************************
* Initialization sequence *
***********************************************************************/
init_fnc_t *init_sequence[] = {
#if defined(CONFIG_BOARD_PRE_INIT)
board_pre_init, /* Call board-specific init code early.*/
#endif
env_init,
serial_init,
console_init_f,
display_options,
checkcpu,
checkboard,
NULL, /* Terminate this list */
};
/***********************************************************************/
void board_init (void)
{
DECLARE_GLOBAL_DATA_PTR;
bd_t *bd;
init_fnc_t **init_fnc_ptr;
/* Pointer is writable since we allocated a register for it.
* Nios treats CFG_GBL_DATA_OFFSET as an address.
*/
gd = (gd_t *)CFG_GBL_DATA_OFFSET;
memset( gd, 0, CFG_GBL_DATA_SIZE );
/* Copy exception vectors to the correct location.
*/
memcpy( (void *)CFG_VECT_BASE, _vectors, 256 );
gd->bd = (bd_t *)(gd+1); /* At end of global data */
gd->baudrate = CONFIG_BAUDRATE;
gd->cpu_clk = CONFIG_SYS_CLK_FREQ;
bd = gd->bd;
bd->bi_memstart = CFG_SDRAM_BASE;
bd->bi_memsize = CFG_SDRAM_SIZE;
bd->bi_flashstart = CFG_FLASH_BASE;
bd->bi_sramstart= CFG_SRAM_BASE;
bd->bi_sramsize = CFG_SRAM_SIZE;
bd->bi_baudrate = CONFIG_BAUDRATE;
for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
if ((*init_fnc_ptr) () != 0) {
hang ();
}
}
bd->bi_flashsize = flash_init();
mem_malloc_init();
malloc_bin_reloc();
env_relocate();
devices_init();
jumptable_init();
console_init_r();
/*
*/
interrupt_init ();
/* main_loop */
for (;;) {
WATCHDOG_RESET ();
main_loop ();
}
}
/***********************************************************************/
void hang (void)
{
puts("### ERROR ### Please reset board ###\n");
for (;;);
}
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