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