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/* $NetBSD: iris_start.S,v 1.1 2019/01/12 16:44:47 tsutsui Exp $ */
/*
* Copyright (c) 2018 Naruaki Etomi
* 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.
*
* 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.
*/
/*
* Silicon Graphics "IRIS" series MIPS processors machine bootloader.
*/
#include <mips/asm.h>
#include <mips/cpuregs.h>
.globl start
start:
.set noreorder
#ifdef __GP_SUPPORT__
la gp, _C_LABEL(_gp)
#endif
/*
* We assume the bootprom isn't expecting us to preserve the saved
* registers.
*/
move s0, a0 # save argc
move s1, a1 # save argv
move s2, a2 # save envp
move s3, ra # save RA
la a0, _C_LABEL(edata) # clear BSS
move a1, zero
la a2, _C_LABEL(end)
jal _C_LABEL(memset) # memset(edata, 0, end - edata)
subu a2, a2, a0
move a0, s0 # restore argc
move a1, s1 # restore argv
move a2, s2 # restore envp
j _C_LABEL(main) # main(argc, argv)
move ra, s3 # restore RA
LEAF(romrestart)
XLEAF(_rtt)
PTR_LA v0, 0xBFC00000 # indigo RESET
j v0
nop
END(romrestart)
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