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418 jermar 1 
#
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# Copyright (C) 2005 Jakub Jermar
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# - Redistributions of source code must retain the above copyright
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#   notice, this list of conditions and the following disclaimer.
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# - Redistributions in binary form must reproduce the above copyright
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#   notice, this list of conditions and the following disclaimer in the
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#   documentation and/or other materials provided with the distribution.
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# - The name of the author may not be used to endorse or promote products
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#   derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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846 jermar 29 
#include <arch/boot/boot.h>
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.register %g2, #scratch
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.register %g3, #scratch
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.register %g6, #scratch
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.register %g7, #scratch
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.section K_TEXT_START, "ax"
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/*
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 * Here is where the kernel is passed control.
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 * The code must be position independent until
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 * the kernel relocates itself to its VMA.
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 */
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.global kernel_image_start
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kernel_image_start:
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0:
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	b 1f
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	nop
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/*
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 * This header forces SILO to load the kernel at 0x4000.
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 * More precisely, SILO will think this is an old version of Linux.
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 */
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.ascii "HdrS"
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.word 0
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.half 0
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.align 8
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1:
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	flushw				! flush all but the active register window
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	/*
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	 * Prepare to copy the kernel image to 4M.
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	 */
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	set LMA, %g1			! source address
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	set VMA, %g2			! destination address
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	set hardcoded_ktext_size, %g3	! link address of hardcoded_ktext_size
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	set hardcoded_kdata_size, %g4	! link address of hardcoded_kdata_size
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	sub %g3, %g2, %g3		! offset of hardcoded_ktext_size from the beginning of the load address
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	sub %g4, %g2, %g4		! offset of hardcoded_kdata_size from the beginning of the load address
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	ldx [%g3 + %g1], %g3		! hardcoded_ktext_size -> %g3
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	ldx [%g4 + %g1], %g4		! hardcoded_kdata_size -> %g4
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	add %g3, %g4, %g3		! size of kernel text and data
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	/*
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	 * Start copying the kernel from higher addresses towards lower addresses.
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	 */
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2:	dec %g3
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	ldub [%g1 + %g3], %g4
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	stb %g4, [%g2 + %g3]
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	cmp %g3, 0
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	bnz 2b
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	nop
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	set relocated, %g1
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	jmp %g1
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	nop
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relocated:
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	set ofw, %l0
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	call ofw_init
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	stx %o4, [%l0]
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	call main_bsp
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	nop
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	/* Not reached. */
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2:
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	b 2b
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	nop