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      1 /*	$NetBSD: iris_start.S,v 1.1 2019/01/12 16:44:47 tsutsui Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2018 Naruaki Etomi
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 /*
     29  * Silicon Graphics "IRIS" series MIPS processors machine bootloader.
     30  */
     31 
     32 #include <mips/asm.h>
     33 #include <mips/cpuregs.h>
     34 
     35 	.globl	start
     36 start:
     37 	.set	noreorder
     38 #ifdef __GP_SUPPORT__
     39 	la	gp, _C_LABEL(_gp)
     40 #endif
     41 	/*
     42 	 * We assume the bootprom isn't expecting us to preserve the saved
     43 	 * registers.
     44 	 */
     45 	move	s0, a0				# save argc
     46 	move	s1, a1				# save argv
     47 	move	s2, a2				# save envp
     48 	move	s3, ra				# save RA
     49 
     50 	la	a0, _C_LABEL(edata)		# clear BSS
     51 	move	a1, zero
     52 	la	a2, _C_LABEL(end)
     53 	jal	_C_LABEL(memset)		# memset(edata, 0, end - edata)
     54 	 subu	a2, a2, a0
     55 
     56 	move	a0, s0				# restore argc
     57 	move	a1, s1				# restore argv
     58 	move	a2, s2				# restore envp
     59 	j	_C_LABEL(main)			# main(argc, argv)
     60 	 move	ra, s3				# restore RA
     61 
     62 LEAF(romrestart)
     63 XLEAF(_rtt)
     64 	PTR_LA	v0, 0xBFC00000			# indigo RESET
     65 	j	v0
     66 	 nop
     67 END(romrestart)
     68