start.S revision 1.23
1 /* $NetBSD: start.S,v 1.23 2011/03/26 15:49:26 tsutsui 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1992, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * This code is derived from software contributed to Berkeley by 37 * Ralph Campbell. 38 * 39 * Redistribution and use in source and binary forms, with or without 40 * modification, are permitted provided that the following conditions 41 * are met: 42 * 1. Redistributions of source code must retain the above copyright 43 * notice, this list of conditions and the following disclaimer. 44 * 2. Redistributions in binary form must reproduce the above copyright 45 * notice, this list of conditions and the following disclaimer in the 46 * documentation and/or other materials provided with the distribution. 47 * 3. Neither the name of the University nor the names of its contributors 48 * may be used to endorse or promote products derived from this software 49 * without specific prior written permission. 50 * 51 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 52 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 53 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 54 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 55 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 56 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 57 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 59 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 60 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 61 * SUCH DAMAGE. 62 * 63 * @(#)start.s 8.2 (Berkeley) 1/21/94 64 */ 65 66 /* 67 * start.s - 68 * 69 * Contains code that is the first executed at boot time. 70 * 71 * Copyright (C) 1989 Digital Equipment Corporation. 72 * Permission to use, copy, modify, and distribute this software and 73 * its documentation for any purpose and without fee is hereby granted, 74 * provided that the above copyright notice appears in all copies. 75 * Digital Equipment Corporation makes no representations about the 76 * suitability of this software for any purpose. It is provided "as is" 77 * without express or implied warranty. 78 * 79 * from: Header: /sprite/src/boot/decprom/ds3100.md/RCS/start.s, 80 * v 1.1 90/02/16 16:19:39 shirriff Exp SPRITE (DECWRL) 81 */ 82 83 #include <mips/asm.h> 84 #include <mips/cpuregs.h> 85 #include <machine/dec_prom.h> 86 87 .extern callv, 4 88 89 .globl start 90 start: 91 .set noreorder 92 #ifdef __GP_SUPPORT__ 93 la gp, _C_LABEL (_gp) 94 #endif 95 la sp, start - CALLFRAME_SIZ 96 sw zero, CALLFRAME_RA(sp) # Zero out old ra for debugger 97 sw zero, CALLFRAME_SP(sp) # Zero out old fp for debugger 98 move s0, a0 # save argc 99 move s1, a1 # save argv 100 beq a2, DEC_REX_MAGIC, 1f # jump if boot from DS5000 101 move s3, a3 # BDslot: save call vector 102 la s3, _C_LABEL(callvec) # init call vector 103 1: 104 la a0, _C_LABEL (edata) # clear BSS 105 move a1, zero 106 la a2, _C_LABEL (end) 107 jal _C_LABEL(memset) # memset(edata, 0, end - edata) 108 subu a2, a2, a0 109 sw s3, _C_LABEL(callv) # save call vector 110 move a0, s0 # restore argc 111 jal _C_LABEL(main) # main(argc, argv) 112 move a1, s1 # restore argv 113 j _C_LABEL(prom_restart) # restart... 114 nop 115 116 .set reorder # make as(1) handle hazard and BDslot 117 LEAF(prom_restart) 118 XLEAF(_rtt) 119 lw v0, _C_LABEL (callv) 120 lw v0, 0x9C(v0) /* halt */ 121 move a0, zero /* Don't print anything. */ 122 move a1, zero 123 j v0 124 END(prom_restart) 125 126 LEAF(prom_open) 127 li v0, DEC_PROM_OPEN 128 j v0 129 END(prom_open) 130 131 #ifndef LIBSA_NO_DEV_CLOSE 132 LEAF(prom_close) 133 li v0, DEC_PROM_CLOSE 134 j v0 135 END(prom_close) 136 #endif 137 138 LEAF(prom_lseek) 139 li v0, DEC_PROM_LSEEK 140 j v0 141 END(prom_lseek) 142 143 LEAF(prom_read) 144 li v0, DEC_PROM_READ 145 j v0 146 END(prom_read) 147 148 LEAF(prom_write) 149 li v0, DEC_PROM_WRITE 150 j v0 151 END(prom_write) 152
Indexes created Wed Sep 24 05:09:52 GMT 2025