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Merge up to 2.6.25-rc3
Merge of 2.6.x-xfs-melb:linux:30555a by kenmcd.

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * PROM library initialisation code.
 *
 * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
 */
#include <linux/init.h>
#include <linux/kernel.h>

#include <asm/bootinfo.h>
#include <asm/sgialib.h>
#include <asm/smp-ops.h>

#undef DEBUG_PROM_INIT

/* Master romvec interface. */
struct linux_romvec *romvec;
int prom_argc;
LONG *_prom_argv, *_prom_envp;

void __init prom_init(void)
{
	PSYSTEM_PARAMETER_BLOCK pb = PROMBLOCK;

	romvec = ROMVECTOR;

	prom_argc = fw_arg0;
	_prom_argv = (LONG *) fw_arg1;
	_prom_envp = (LONG *) fw_arg2;

	if (pb->magic != 0x53435241) {
		printk(KERN_CRIT "Aieee, bad prom vector magic %08lx\n",
		       (unsigned long) pb->magic);
		while(1)
			;
	}

	prom_init_cmdline();
	prom_identify_arch();
	printk(KERN_INFO "PROMLIB: ARC firmware Version %d Revision %d\n",
	       pb->ver, pb->rev);
	prom_meminit();

#ifdef DEBUG_PROM_INIT
	pr_info("Press a key to reboot\n");
	ArcRead(0, &c, 1, &cnt);
	ArcEnterInteractiveMode();
#endif
#ifdef CONFIG_SGI_IP27
	{
		extern struct plat_smp_ops ip27_smp_ops;

		register_smp_ops(&ip27_smp_ops);
	}
#endif
}