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#

# Copyright (c) 2006 Martin Decky

# Copyright (c) 2006 Jakub Jermar

# All rights reserved.

#

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions

# are met:

#

# - Redistributions of source code must retain the above copyright

#   notice, this list of conditions and the following disclaimer.

# - 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.

# - The name of the author may not be used to endorse or promote products

#   derived from this software without specific prior written permission.

#

# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.

#

#include <stack.h>

#include <register.h>

#define INITIAL_STACK_SIZE 	8192

#define NWINDOWS		8

.register %g2, #scratch

.register %g3, #scratch

.register %g6, #scratch

.register %g7, #scratch

.section BOOTSTRAP, "ax"

.global start

start:

	ba %xcc, 1f

	nop

/*

 * This header forces SILO to load the image at 0x4000.

 * More precisely, SILO will think this is an old version of Linux.

 */

	.ascii "HdrS"

	.word 0

	.half 0

	.half 0

	.half 0

	.half 0

.global silo_ramdisk_image

silo_ramdisk_image:

	.word 0

.global silo_ramdisk_size

silo_ramdisk_size:

	.word 0

.align 8

1:	

	/*

	 * Disable interrupts and disable address masking.

	 */

	wrpr %g0, PSTATE_PRIV_BIT, %pstate

	wrpr %g0, NWINDOWS - 2, %cansave	! set maximum saveable windows

	wrpr %g0, 0, %canrestore		! get rid of windows we will never need again

	wrpr %g0, 0, %otherwin			! make sure the window state is consistent

	wrpr %g0, NWINDOWS - 1, %cleanwin	! prevent needless clean_window traps for kernel

	set initial_stack_top, %sp

	add %sp, -STACK_BIAS, %sp

	set ofw_cif, %l0

	call ofw_init		! initialize OpenFirmware

	stx %o4, [%l0]

	ba %xcc, bootstrap

	nop

.align STACK_ALIGNMENT

initial_stack:

	.space INITIAL_STACK_SIZE

initial_stack_top:

	.space STACK_WINDOW_SAVE_AREA_SIZE