70 lines
1.3 KiB
C
70 lines
1.3 KiB
C
/*
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* Broadcom's CFE specific prom routines
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*
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* Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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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;
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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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return 0;
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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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/* 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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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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