87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
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/*
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* $Id$
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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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* Copyright (C) 2007 Florian Fainelli <florian@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 as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/types.h>
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#include <linux/autoconf.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <asm/bootinfo.h>
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#include <asm/addrspace.h>
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#include <asm/string.h>
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#include <asm/mach-bcm963xx/bootloaders.h>
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static char *boot_loader_names[BOOT_LOADER_LAST+1] = {
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[BOOT_LOADER_UNKNOWN] = "Unknown",
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[BOOT_LOADER_CFE] = "CFE",
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[BOOT_LOADER_REDBOOT] = "RedBoot"
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};
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/* boot loaders specific definitions */
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#define CFE_EPTSEAL 0x43464531 /* CFE1 is the magic number to recognize CFE from other bootloaders */
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int boot_loader_type;
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/*
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* Boot loader detection routines
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*/
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static int __init detect_cfe(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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uint32_t cfe_handle = (uint32_t) fw_arg0;
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uint32_t cfe_a1_val = (uint32_t) fw_arg1;
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uint32_t cfe_entry = (uint32_t) fw_arg2;
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uint32_t cfe_seal = (uint32_t) 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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/* cfe_a1_val must be 0, because only one CPU present in the ADM5120 SoC */
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if (cfe_a1_val != 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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return 1;
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}
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static int __init detect_redboot(void)
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{
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/* On Inventel Livebox, the boot loader is passed as a command line argument, check for it */
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if (!strncmp(arcs_cmdline, "boot_loader=RedBoot", 19))
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return 1;
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return 0;
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}
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void __init detect_bootloader(void)
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{
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if (detect_cfe()) {
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boot_loader_type = BOOT_LOADER_CFE;
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printk("Boot loader is : %s\n", boot_loader_names[boot_loader_type]);
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}
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if (detect_redboot()) {
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boot_loader_type = BOOT_LOADER_REDBOOT;
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}
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else
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boot_loader_type = BOOT_LOADER_UNKNOWN;
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}
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EXPORT_SYMBOL(boot_loader_type);
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