srt0.S revision 1.1
1 /* $NetBSD: srt0.S,v 1.1 2014/02/24 07:23:43 skrll Exp $ */ 2 3 /* $OpenBSD: srt0.S,v 1.7 2001/05/16 23:57:35 mickey Exp $ */ 4 5 /* 6 * Copyright (c) 1998-2004 Michael Shalayeff 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT, 22 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 24 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 26 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 27 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 28 * THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 /* 31 * Copyright 1996 1995 by Open Software Foundation, Inc. 32 * All Rights Reserved 33 * 34 * Permission to use, copy, modify, and distribute this software and 35 * its documentation for any purpose and without fee is hereby granted, 36 * provided that the above copyright notice appears in all copies and 37 * that both the copyright notice and this permission notice appear in 38 * supporting documentation. 39 * 40 * OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE 41 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 42 * FOR A PARTICULAR PURPOSE. 43 * 44 * IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR 45 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 46 * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT, 47 * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION 48 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 49 * 50 */ 51 ; 52 ; Copyright (c) 1990 mt Xinu, Inc. All rights reserved. 53 ; Copyright (c) 1990 University of Utah. All rights reserved. 54 ; 55 ; This file may be freely distributed in any form as long as 56 ; this copyright notice is included. 57 ; THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 58 ; IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 59 ; WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 60 ; 61 ; Utah $Hdr: srt0.c 1.3 94/12/13$ 62 ; 63 64 #define _LOCORE 65 #include <machine/iomod.h> 66 #include <machine/asm.h> 67 68 /* 69 * This is the ending of the begin 70 */ 71 ENTRY(begin,0) 72 73 blr %r0,%r5 ; Get address of 'boff' into 'r5', 74 ldo begin-boff(%r5),%r5 ; and subtract to get 'begin'. 75 boff: 76 ldil L%RELOC,%r4 77 ldo R%RELOC(%r4),%r4 78 ldo start-begin(%r4),%rp 79 ldil L%edata,%r3 80 ldo R%edata(%r3),%r3 ; Get address of edata. 81 ldil L%begin,%r1 82 ldo R%begin(%r1),%r1 ; Get address of begin 83 sub %r3,%r1,%r3 ; Subtract to get # of bytes to copy 84 copyloop: ; do 85 ldwm 4(%r5),%r1 ; *r4++ = *r5++; 86 addib,>= -4,%r3,copyloop ; while (--r3 >= 0); 87 stwm %r1,4(%r4) 88 89 ; here we zero the .bss 90 ldil L%__bss_start, %r4 91 ldo R%__bss_start(%r4), %r4 92 ldil L%__bss_end, %r3 93 ldo R%__bss_end(%r3), %r3 94 zeroloop: 95 combf,<,n %r3,%r4, zeroloop ; while (r4 < r3); 96 stwm %r0,4(%r4) ; *r4++ = 0; 97 98 ldil L%$global$,%dp 99 ldo R%$global$(%dp),%dp 100 ldil L%start,%r1 101 ldo R%start(%r1),%r1 102 sub %dp,%r1,%dp ; Subtract to get difference 103 add %rp,%dp,%dp ; and relocate it. 104 105 ; 106 ; We have relocated ourself to RELOC. If we are running on a machine 107 ; with separate instruction and data caches, we must flush our data 108 ; cache before trying to execute the code starting at rp. 109 ; 110 ldil L%RELOC,%r22 ; Set %t1 to start of relocated code. 111 ldo R%RELOC(%r22),%r22 112 ldil L%edata,%r21 ; Set r21 to address of edata 113 ldo R%edata(%r21),%r21 114 ldil L%begin,%r1 ; set %r1 to address of begin 115 ldo R%begin(%r1),%r1 116 sub %r21,%r1,%r21 ; Subtract to get length 117 mtsp %r0,%sr0 ; Set sr0 to kernel space. 118 ldo -1(%r21),%r21 119 fdc %r21(0,%r22) 120 loop: addib,>,n -16,%r21,loop ; Decrement by cache line size (16). 121 fdc %r21(%sr0,%r22) 122 fdc 0(%sr0,%r22) ; Flush first word at addr to handle 123 sync ; arbitrary cache line boundary. 124 nop ; Prevent prefetching. 125 nop 126 nop 127 nop 128 nop 129 nop 130 nop 131 bv 0(%rp) 132 nop 133 EXIT(begin) /* jump to relocated code */ 134 135 start: 136 ldil L%HEAP_LIMIT, %sp 137 ldo R%HEAP_LIMIT(%sp), %sp 138 139 b boot ; Call boot(), 140 copy %r0, %arg0 ; use default boot device 141 nop 142 143 /* 144 * rtt - restart the box 145 */ 146 LEAF_ENTRY(_rtt) 147 ldil L%LBCAST_ADDR, %r25 148 ldi CMD_RESET, %r26 149 stw %r26,R%iomod_command(%r25) 150 forever: ; Loop until bus reset takes effect. 151 b,n forever 152 153 bv 0(%rp) 154 ldo -48(%sp),%sp 155 EXIT(_rtt) 156 157 .end 158
Indexes created Tue Sep 30 07:10:03 GMT 2025