start.S revision 1.17
1 /* $NetBSD: start.S,v 1.17 2003/08/07 16:29:15 agc Exp $ */ 2 3 /*- 4 * Copyright (c) 1999 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jonathan Stone, Michael Hitch and Simon Burge. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Copyright (c) 1992, 1993 41 * The Regents of the University of California. All rights reserved. 42 * 43 * This code is derived from software contributed to Berkeley by 44 * Ralph Campbell. 45 * 46 * Redistribution and use in source and binary forms, with or without 47 * modification, are permitted provided that the following conditions 48 * are met: 49 * 1. Redistributions of source code must retain the above copyright 50 * notice, this list of conditions and the following disclaimer. 51 * 2. Redistributions in binary form must reproduce the above copyright 52 * notice, this list of conditions and the following disclaimer in the 53 * documentation and/or other materials provided with the distribution. 54 * 3. Neither the name of the University nor the names of its contributors 55 * may be used to endorse or promote products derived from this software 56 * without specific prior written permission. 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 59 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 60 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 61 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 62 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 63 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 64 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 65 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 66 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 67 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 68 * SUCH DAMAGE. 69 * 70 * @(#)start.s 8.2 (Berkeley) 1/21/94 71 */ 72 73 /* 74 * start.s - 75 * 76 * Contains code that is the first executed at boot time. 77 * 78 * Copyright (C) 1989 Digital Equipment Corporation. 79 * Permission to use, copy, modify, and distribute this software and 80 * its documentation for any purpose and without fee is hereby granted, 81 * provided that the above copyright notice appears in all copies. 82 * Digital Equipment Corporation makes no representations about the 83 * suitability of this software for any purpose. It is provided "as is" 84 * without express or implied warranty. 85 * 86 * from: Header: /sprite/src/boot/decprom/ds3100.md/RCS/start.s, 87 * v 1.1 90/02/16 16:19:39 shirriff Exp SPRITE (DECWRL) 88 */ 89 90 #include <mips/asm.h> 91 #include <mips/cpuregs.h> 92 #include <machine/dec_prom.h> 93 94 .extern callv, 4 95 96 .globl start 97 start: 98 .set noreorder 99 #ifdef __GP_SUPPORT__ 100 la gp, _C_LABEL (_gp) 101 #endif 102 la sp, start - CALLFRAME_SIZ 103 sw zero, CALLFRAME_RA(sp) # Zero out old ra for debugger 104 sw zero, CALLFRAME_SP(sp) # Zero out old fp for debugger 105 move s0, a0 # save argc 106 move s1, a1 # save argv 107 beq a2, DEC_REX_MAGIC, 1f # jump if boot from DS5000 108 move s3, a3 # BDslot: save call vector 109 la s3, _C_LABEL(callvec) # init call vector 110 1: 111 la a0, _C_LABEL (edata) # clear BSS 112 move a1, zero 113 la a2, _C_LABEL (end) 114 jal _C_LABEL(memset) # memset(edata, 0, end - edata) 115 subu a2, a2, a0 116 sw s3, _C_LABEL(callv) # save call vector 117 move a0, s0 # restore argc 118 jal _C_LABEL(main) # main(argc, argv) 119 move a1, s1 # restore argv 120 j _C_LABEL(prom_restart) # restart... 121 nop 122 123 LEAF(prom_restart) 124 XLEAF(_rtt) 125 lw v0, _C_LABEL (callv) 126 lw v0, 0x9C(v0) /* halt */ 127 move a0, zero /* Don't print anything. */ 128 j v0 129 move a1, zero 130 END(prom_restart) 131 132 LEAF(prom_open) 133 li v0, DEC_PROM_OPEN 134 j v0 135 nop 136 END(prom_open) 137 138 #ifndef LIBSA_NO_DEV_CLOSE 139 LEAF(prom_close) 140 li v0, DEC_PROM_CLOSE 141 j v0 142 nop 143 END(prom_close) 144 #endif 145 146 LEAF(prom_lseek) 147 li v0, DEC_PROM_LSEEK 148 j v0 149 nop 150 END(prom_lseek) 151 152 LEAF(prom_read) 153 li v0, DEC_PROM_READ 154 j v0 155 nop 156 END(prom_read) 157 158 LEAF(prom_write) 159 li v0, DEC_PROM_WRITE 160 j v0 161 nop 162 END(prom_read) 163
Indexes created Fri Sep 26 20:09:58 GMT 2025