srt0.S revision 1.1.6.2
1 1.1.6.2 yamt /* $NetBSD: srt0.S,v 1.1.6.2 2014/05/22 11:39:51 yamt Exp $ */ 2 1.1.6.2 yamt 3 1.1.6.2 yamt /* $OpenBSD: srt0.S,v 1.7 2001/05/16 23:57:35 mickey Exp $ */ 4 1.1.6.2 yamt 5 1.1.6.2 yamt /* 6 1.1.6.2 yamt * Copyright (c) 1998-2004 Michael Shalayeff 7 1.1.6.2 yamt * All rights reserved. 8 1.1.6.2 yamt * 9 1.1.6.2 yamt * Redistribution and use in source and binary forms, with or without 10 1.1.6.2 yamt * modification, are permitted provided that the following conditions 11 1.1.6.2 yamt * are met: 12 1.1.6.2 yamt * 1. Redistributions of source code must retain the above copyright 13 1.1.6.2 yamt * notice, this list of conditions and the following disclaimer. 14 1.1.6.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 15 1.1.6.2 yamt * notice, this list of conditions and the following disclaimer in the 16 1.1.6.2 yamt * documentation and/or other materials provided with the distribution. 17 1.1.6.2 yamt * 18 1.1.6.2 yamt * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 1.1.6.2 yamt * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 1.1.6.2 yamt * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 1.1.6.2 yamt * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT, 22 1.1.6.2 yamt * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 23 1.1.6.2 yamt * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 24 1.1.6.2 yamt * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 1.1.6.2 yamt * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 26 1.1.6.2 yamt * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 27 1.1.6.2 yamt * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 28 1.1.6.2 yamt * THE POSSIBILITY OF SUCH DAMAGE. 29 1.1.6.2 yamt */ 30 1.1.6.2 yamt /* 31 1.1.6.2 yamt * Copyright 1996 1995 by Open Software Foundation, Inc. 32 1.1.6.2 yamt * All Rights Reserved 33 1.1.6.2 yamt * 34 1.1.6.2 yamt * Permission to use, copy, modify, and distribute this software and 35 1.1.6.2 yamt * its documentation for any purpose and without fee is hereby granted, 36 1.1.6.2 yamt * provided that the above copyright notice appears in all copies and 37 1.1.6.2 yamt * that both the copyright notice and this permission notice appear in 38 1.1.6.2 yamt * supporting documentation. 39 1.1.6.2 yamt * 40 1.1.6.2 yamt * OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE 41 1.1.6.2 yamt * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 42 1.1.6.2 yamt * FOR A PARTICULAR PURPOSE. 43 1.1.6.2 yamt * 44 1.1.6.2 yamt * IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR 45 1.1.6.2 yamt * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 46 1.1.6.2 yamt * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT, 47 1.1.6.2 yamt * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION 48 1.1.6.2 yamt * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 49 1.1.6.2 yamt * 50 1.1.6.2 yamt */ 51 1.1.6.2 yamt ; 52 1.1.6.2 yamt ; Copyright (c) 1990 mt Xinu, Inc. All rights reserved. 53 1.1.6.2 yamt ; Copyright (c) 1990 University of Utah. All rights reserved. 54 1.1.6.2 yamt ; 55 1.1.6.2 yamt ; This file may be freely distributed in any form as long as 56 1.1.6.2 yamt ; this copyright notice is included. 57 1.1.6.2 yamt ; THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 58 1.1.6.2 yamt ; IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 59 1.1.6.2 yamt ; WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 60 1.1.6.2 yamt ; 61 1.1.6.2 yamt ; Utah $Hdr: srt0.c 1.3 94/12/13$ 62 1.1.6.2 yamt ; 63 1.1.6.2 yamt 64 1.1.6.2 yamt #define _LOCORE 65 1.1.6.2 yamt #include <machine/iomod.h> 66 1.1.6.2 yamt #include <machine/asm.h> 67 1.1.6.2 yamt 68 1.1.6.2 yamt /* 69 1.1.6.2 yamt * This is the ending of the begin 70 1.1.6.2 yamt */ 71 1.1.6.2 yamt ENTRY(begin,0) 72 1.1.6.2 yamt 73 1.1.6.2 yamt blr %r0,%r5 ; Get address of 'boff' into 'r5', 74 1.1.6.2 yamt ldo begin-boff(%r5),%r5 ; and subtract to get 'begin'. 75 1.1.6.2 yamt boff: 76 1.1.6.2 yamt ldil L%RELOC,%r4 77 1.1.6.2 yamt ldo R%RELOC(%r4),%r4 78 1.1.6.2 yamt ldo start-begin(%r4),%rp 79 1.1.6.2 yamt ldil L%edata,%r3 80 1.1.6.2 yamt ldo R%edata(%r3),%r3 ; Get address of edata. 81 1.1.6.2 yamt ldil L%begin,%r1 82 1.1.6.2 yamt ldo R%begin(%r1),%r1 ; Get address of begin 83 1.1.6.2 yamt sub %r3,%r1,%r3 ; Subtract to get # of bytes to copy 84 1.1.6.2 yamt copyloop: ; do 85 1.1.6.2 yamt ldwm 4(%r5),%r1 ; *r4++ = *r5++; 86 1.1.6.2 yamt addib,>= -4,%r3,copyloop ; while (--r3 >= 0); 87 1.1.6.2 yamt stwm %r1,4(%r4) 88 1.1.6.2 yamt 89 1.1.6.2 yamt ; here we zero the .bss 90 1.1.6.2 yamt ldil L%__bss_start, %r4 91 1.1.6.2 yamt ldo R%__bss_start(%r4), %r4 92 1.1.6.2 yamt ldil L%__bss_end, %r3 93 1.1.6.2 yamt ldo R%__bss_end(%r3), %r3 94 1.1.6.2 yamt zeroloop: 95 1.1.6.2 yamt combf,<,n %r3,%r4, zeroloop ; while (r4 < r3); 96 1.1.6.2 yamt stwm %r0,4(%r4) ; *r4++ = 0; 97 1.1.6.2 yamt 98 1.1.6.2 yamt ldil L%$global$,%dp 99 1.1.6.2 yamt ldo R%$global$(%dp),%dp 100 1.1.6.2 yamt ldil L%start,%r1 101 1.1.6.2 yamt ldo R%start(%r1),%r1 102 1.1.6.2 yamt sub %dp,%r1,%dp ; Subtract to get difference 103 1.1.6.2 yamt add %rp,%dp,%dp ; and relocate it. 104 1.1.6.2 yamt 105 1.1.6.2 yamt ; 106 1.1.6.2 yamt ; We have relocated ourself to RELOC. If we are running on a machine 107 1.1.6.2 yamt ; with separate instruction and data caches, we must flush our data 108 1.1.6.2 yamt ; cache before trying to execute the code starting at rp. 109 1.1.6.2 yamt ; 110 1.1.6.2 yamt ldil L%RELOC,%r22 ; Set %t1 to start of relocated code. 111 1.1.6.2 yamt ldo R%RELOC(%r22),%r22 112 1.1.6.2 yamt ldil L%edata,%r21 ; Set r21 to address of edata 113 1.1.6.2 yamt ldo R%edata(%r21),%r21 114 1.1.6.2 yamt ldil L%begin,%r1 ; set %r1 to address of begin 115 1.1.6.2 yamt ldo R%begin(%r1),%r1 116 1.1.6.2 yamt sub %r21,%r1,%r21 ; Subtract to get length 117 1.1.6.2 yamt mtsp %r0,%sr0 ; Set sr0 to kernel space. 118 1.1.6.2 yamt ldo -1(%r21),%r21 119 1.1.6.2 yamt fdc %r21(0,%r22) 120 1.1.6.2 yamt loop: addib,>,n -16,%r21,loop ; Decrement by cache line size (16). 121 1.1.6.2 yamt fdc %r21(%sr0,%r22) 122 1.1.6.2 yamt fdc 0(%sr0,%r22) ; Flush first word at addr to handle 123 1.1.6.2 yamt sync ; arbitrary cache line boundary. 124 1.1.6.2 yamt nop ; Prevent prefetching. 125 1.1.6.2 yamt nop 126 1.1.6.2 yamt nop 127 1.1.6.2 yamt nop 128 1.1.6.2 yamt nop 129 1.1.6.2 yamt nop 130 1.1.6.2 yamt nop 131 1.1.6.2 yamt bv 0(%rp) 132 1.1.6.2 yamt nop 133 1.1.6.2 yamt EXIT(begin) /* jump to relocated code */ 134 1.1.6.2 yamt 135 1.1.6.2 yamt start: 136 1.1.6.2 yamt ldil L%HEAP_LIMIT, %sp 137 1.1.6.2 yamt ldo R%HEAP_LIMIT(%sp), %sp 138 1.1.6.2 yamt 139 1.1.6.2 yamt b boot ; Call boot(), 140 1.1.6.2 yamt copy %r0, %arg0 ; use default boot device 141 1.1.6.2 yamt nop 142 1.1.6.2 yamt 143 1.1.6.2 yamt /* 144 1.1.6.2 yamt * rtt - restart the box 145 1.1.6.2 yamt */ 146 1.1.6.2 yamt LEAF_ENTRY(_rtt) 147 1.1.6.2 yamt ldil L%LBCAST_ADDR, %r25 148 1.1.6.2 yamt ldi CMD_RESET, %r26 149 1.1.6.2 yamt stw %r26,R%iomod_command(%r25) 150 1.1.6.2 yamt forever: ; Loop until bus reset takes effect. 151 1.1.6.2 yamt b,n forever 152 1.1.6.2 yamt 153 1.1.6.2 yamt bv 0(%rp) 154 1.1.6.2 yamt ldo -48(%sp),%sp 155 1.1.6.2 yamt EXIT(_rtt) 156 1.1.6.2 yamt 157 1.1.6.2 yamt .end 158
Indexes created Mon Oct 20 15:10:11 GMT 2025