start.S revision 1.15
1 /* $NetBSD: start.S,v 1.15 1999/11/27 03:10:07 simonb 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. All advertising materials mentioning features or use of this software 55 * must display the following acknowledgement: 56 * This product includes software developed by the University of 57 * California, Berkeley and its contributors. 58 * 4. Neither the name of the University nor the names of its contributors 59 * may be used to endorse or promote products derived from this software 60 * without specific prior written permission. 61 * 62 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 63 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 64 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 65 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 66 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 67 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 68 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 69 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 70 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 71 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 72 * SUCH DAMAGE. 73 * 74 * @(#)start.s 8.2 (Berkeley) 1/21/94 75 */ 76 77 /* 78 * start.s - 79 * 80 * Contains code that is the first executed at boot time. 81 * 82 * Copyright (C) 1989 Digital Equipment Corporation. 83 * Permission to use, copy, modify, and distribute this software and 84 * its documentation for any purpose and without fee is hereby granted, 85 * provided that the above copyright notice appears in all copies. 86 * Digital Equipment Corporation makes no representations about the 87 * suitability of this software for any purpose. It is provided "as is" 88 * without express or implied warranty. 89 * 90 * from: Header: /sprite/src/boot/decprom/ds3100.md/RCS/start.s, 91 * v 1.1 90/02/16 16:19:39 shirriff Exp SPRITE (DECWRL) 92 */ 93 94 #include <mips/asm.h> 95 #include <mips/cpuregs.h> 96 #include <machine/dec_prom.h> 97 98 #ifdef BOOTRZ 99 /* 100 * Boot block that starts in sector 0 101 */ 102 103 Dec_Diskboot: 104 .word 0, 0 /* pad */ 105 .word 0x0002757a /* DEC_BOOT_MAGIC */ 106 .word 0 /* mode = single sequence of blocks */ 107 .word Dec_Diskboot /* loadAddr */ 108 .word start /* execAddr */ 109 .word 16, 0 /* map[0] numBlocks, startBlock */ 110 .word 0,0, 0,0, 0,0, 0,0 /* pad to 64 bytes (start of label) */ 111 112 Label_goes_here: 113 .word 0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0 /* 276 bytes for ... */ 114 .word 0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0 /* ... BSD label */ 115 .word 0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0 116 .word 0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0 117 .word 0,0, 0,0, 0 118 #endif 119 120 .extern callv, 4 121 122 123 .globl start 124 start: 125 .set noreorder 126 #ifdef __GP_SUPPORT__ 127 la gp, _C_LABEL (_gp) 128 #endif 129 la sp, start - CALLFRAME_SIZ 130 sw zero, CALLFRAME_RA(sp) # Zero out old ra for debugger 131 sw zero, CALLFRAME_SP(sp) # Zero out old fp for debugger 132 move s0, a0 # save argc 133 move s1, a1 # save argv 134 beq a2, DEC_REX_MAGIC, 1f # jump if boot from DS5000 135 move s3, a3 # BDslot: save call vector 136 la s3, _C_LABEL(callvec) # init call vector 137 1: 138 la a0, _C_LABEL (edata) # clear BSS 139 move a1, zero 140 la a2, _C_LABEL (end) 141 jal _C_LABEL(memset) # memset(edata, 0, end - edata) 142 subu a2, a2, a0 143 sw s3, _C_LABEL(callv) # save call vector 144 move a0, s0 # restore argc 145 jal _C_LABEL(main) # main(argc, argv) 146 move a1, s1 # restore argv 147 j _C_LABEL(prom_restart) # restart... 148 nop 149 150 LEAF(prom_restart) 151 lw v0, _C_LABEL (callv) 152 lw v0, 0x9C(v0) /* halt */ 153 move a0, zero /* Don't print anything. */ 154 j v0 155 move a1, zero 156 END(prom_restart) 157 158 LEAF(prom_open) 159 li v0, DEC_PROM_OPEN 160 j v0 161 nop 162 END(prom_open) 163 164 #ifndef LIBSA_NO_DEV_CLOSE 165 LEAF(prom_close) 166 li v0, DEC_PROM_CLOSE 167 j v0 168 nop 169 END(prom_close) 170 #endif 171 172 LEAF(prom_lseek) 173 li v0, DEC_PROM_LSEEK 174 j v0 175 nop 176 END(prom_lseek) 177 178 LEAF(prom_read) 179 li v0, DEC_PROM_READ 180 j v0 181 nop 182 END(prom_read) 183
Indexes created Thu Oct 23 18:09:57 GMT 2025