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1018 decky 1
#
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# Copyright (c) 2006 Martin Decky
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# Copyright (c) 2006 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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#include <stack.h>
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#include <register.h>
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#define INITIAL_STACK_SIZE 	8192
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#define NWINDOWS		8
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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 BOOTSTRAP, "ax"
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.global start
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start:
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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 image 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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	/*
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	 * Disable interrupts and disable address masking.
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	 */
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	wrpr %g0, PSTATE_PRIV_BIT, %pstate
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	wrpr %g0, NWINDOWS - 2, %cansave	! set maximum saveable windows
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	wrpr %g0, 0, %canrestore		! get rid of windows we will never need again
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	wrpr %g0, 0, %otherwin			! make sure the window state is consistent
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	wrpr %g0, NWINDOWS - 1, %cleanwin	! prevent needless clean_window traps for kernel
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	set initial_stack_top, %sp
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	add %sp, -STACK_BIAS, %sp
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	set ofw_cif, %l0
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	call ofw_init		! initialize OpenFirmware
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	stx %o4, [%l0]
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	b bootstrap
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	nop
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.align STACK_ALIGNMENT
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initial_stack:
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	.space INITIAL_STACK_SIZE
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initial_stack_top:
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	.space STACK_WINDOW_SAVE_AREA_SIZE