/*-
 * Copyright (c) 2009, Kohsuke Ohtani
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * head.S - header code for PReP platforms.
 */

#include <conf/config.h>
#include <machine/memory.h>
#include <machine/syspage.h>


#define BOOTSP		(BOOTSTKTOP - KERNBASE)

#define MSR_EE		0x8000

#define ENTRY(x) .global x; .align; x##:

	.section ".text","ax"

/*
 * PReP data
 */
		.long	0x00040000	/* boot offset:	0x400 */
		.long	0x00000800	/* boot size: 0x80000 */

.org	0x200
/*
 * Loader entry point
 */
ENTRY(boot_entry)
	/*
	 * Disable interrupts
	 */
	mfmsr	%r3
	andi.	%r3, %r3, ~MSR_EE@l
	mtmsr	%r3

	/*
	 * Load the boot stack
	 */
	lis	r1, BOOTSP@ha
	ori	r1, r1, BOOTSP@l
	subi	r1, r1, 8

	b	main

	.section .tail,"ax"
dummy:
	.byte	0xff

.end
