87 lines
2.0 KiB
C
87 lines
2.0 KiB
C
/*
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* $Id$
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*
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* Broadcom's CFE specific prom routines
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*
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* Copyright (C) 2007 OpenWrt.org
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* Copyright (C) 2007 Gabor Juhos <juhosg@freemail.hu>
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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
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* as published by the Free Software Foundation; either version 2
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* of 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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include <linux/types.h>
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#include <linux/init.h>
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#include <asm/bootinfo.h>
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#include <asm/addrspace.h>
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#include <prom/cfe.h>
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#include "prom_read.h"
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/*
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* CFE based boards
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*/
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#define CFE_EPTSEAL 0x43464531 /* CFE1 is the magic number to recognize CFE
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from other bootloaders */
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static int cfe_found = 0;
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static u32 cfe_handle;
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static u32 cfe_entry;
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static u32 cfe_seal;
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int __init cfe_present(void)
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{
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/*
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* This method only works, when we are booted directly from the CFE.
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*/
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u32 a1 = (u32) fw_arg1;
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if (cfe_found)
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return 1;
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cfe_handle = (u32) fw_arg0;
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cfe_entry = (u32) fw_arg2;
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cfe_seal = (u32) fw_arg3;
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/* Check for CFE by finding the CFE magic number */
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if (cfe_seal != CFE_EPTSEAL) {
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/* We are not booted from CFE */
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return 0;
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}
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/* cfe_a1_val must be 0, because only one CPU present in the ADM5120 */
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if (a1 != 0) {
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return 0;
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}
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/* The cfe_handle, and the cfe_entry must be kernel mode addresses */
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if ((cfe_handle < KSEG0) || (cfe_entry < KSEG0)) {
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return 0;
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}
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cfe_found = 1;
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return 1;
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}
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char *cfe_getenv(char *envname)
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{
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if (cfe_found == 0)
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return NULL;
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return NULL;
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}
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