mirror of https://github.com/hak5/openwrt.git
87 lines
2.0 KiB
C
87 lines
2.0 KiB
C
|
/*
|
||
|
|
* $Id$
|
||
|
|
*
|
||
|
|
* Broadcom's CFE specific prom routines
|
||
|
|
*
|
||
|
|
* Copyright (C) 2007 OpenWrt.org
|
||
|
|
* Copyright (C) 2007 Gabor Juhos <juhosg@freemail.hu>
|
||
|
|
*
|
||
|
|
* 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., 51 Franklin Street, Fifth Floor,
|
||
|
|
* Boston, MA 02110-1301, USA.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/types.h>
|
||
|
|
#include <linux/init.h>
|
||
|
|
|
||
|
|
#include <asm/bootinfo.h>
|
||
|
|
#include <asm/addrspace.h>
|
||
|
|
|
||
|
|
#include <prom/cfe.h>
|
||
|
|
#include "prom_read.h"
|
||
|
|
|
||
|
|
/*
|
||
|
|
* CFE based boards
|
||
|
|
*/
|
||
|
|
#define CFE_EPTSEAL 0x43464531 /* CFE1 is the magic number to recognize CFE
|
||
|
|
from other bootloaders */
|
||
|
|
|
||
|
|
static int cfe_found = 0;
|
||
|
|
|
||
|
|
static u32 cfe_handle;
|
||
|
|
static u32 cfe_entry;
|
||
|
|
static u32 cfe_seal;
|
||
|
|
|
||
|
|
int __init cfe_present(void)
|
||
|
|
{
|
||
|
|
/*
|
||
|
|
* This method only works, when we are booted directly from the CFE.
|
||
|
|
*/
|
||
|
|
u32 a1 = (u32) fw_arg1;
|
||
|
|
|
||
|
|
if (cfe_found)
|
||
|
|
return 1;
|
||
|
|
|
||
|
|
cfe_handle = (u32) fw_arg0;
|
||
|
|
cfe_entry = (u32) fw_arg2;
|
||
|
|
cfe_seal = (u32) fw_arg3;
|
||
|
|
|
||
|
|
/* Check for CFE by finding the CFE magic number */
|
||
|
|
if (cfe_seal != CFE_EPTSEAL) {
|
||
|
|
/* We are not booted from CFE */
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* cfe_a1_val must be 0, because only one CPU present in the ADM5120 */
|
||
|
|
if (a1 != 0) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* The cfe_handle, and the cfe_entry must be kernel mode addresses */
|
||
|
|
if ((cfe_handle < KSEG0) || (cfe_entry < KSEG0)) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
cfe_found = 1;
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
char *cfe_getenv(char *envname)
|
||
|
|
{
|
||
|
|
if (cfe_found == 0)
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
return NULL;
|
||
|
|
}
|