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#

# Copyright (C) 2005 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,

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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

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#

#include <arch/boot/boot.h>

.register %g2, #scratch

.register %g3, #scratch

.register %g6, #scratch

.register %g7, #scratch

.section K_TEXT_START, "ax"

/*

 * Here is where the kernel is passed control.

 * The code must be position independent until

 * the kernel relocates itself to its VMA.

 */

.global kernel_image_start

kernel_image_start:

0:

	b 1f

	nop

/*

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

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

 */

.ascii "HdrS"

.word 0

.half 0

.align 8

1:

	flushw				! flush all but the active register window

	/*

	 * Prepare to copy the kernel image to 4M.

	 */

	set LMA, %g1			! source address

	set VMA, %g2			! destination address

	set hardcoded_ktext_size, %g3	! link address of hardcoded_ktext_size

	set hardcoded_kdata_size, %g4	! link address of hardcoded_kdata_size

	sub %g3, %g2, %g3		! offset of hardcoded_ktext_size from the beginning of the load address

	sub %g4, %g2, %g4		! offset of hardcoded_kdata_size from the beginning of the load address

	ldx [%g3 + %g1], %g3		! hardcoded_ktext_size -> %g3

	ldx [%g4 + %g1], %g4		! hardcoded_kdata_size -> %g4

	add %g3, %g4, %g3		! size of kernel text and data

	/*

	 * Start copying the kernel from higher addresses towards lower addresses.

	 */

2:	dec %g3

	ldub [%g1 + %g3], %g4

	stb %g4, [%g2 + %g3]

	cmp %g3, 0

	bnz 2b

	nop

	set relocated, %g1

	jmp %g1

	nop

relocated:

	set ofw, %l0

	call ofw_init

	stx %o4, [%l0]

	call ofw_init_memmap

	nop

	wrpr %r0, 0, %pil

	call main_bsp

	nop

	/* Not reached. */

2:

	b 2b

	nop