wdboot.S revision 1.1
1 1.1 he /* $NetBSD: wdboot.S,v 1.1 2003/10/28 11:35:00 he Exp $ */ 2 1.1 he 3 1.1 he /* 4 1.1 he * Copyright (c) 1995 Waldi Ravens 5 1.1 he * All rights reserved. 6 1.1 he * 7 1.1 he * Redistribution and use in source and binary forms, with or without 8 1.1 he * modification, are permitted provided that the following conditions 9 1.1 he * are met: 10 1.1 he * 1. Redistributions of source code must retain the above copyright 11 1.1 he * notice, this list of conditions and the following disclaimer. 12 1.1 he * 2. Redistributions in binary form must reproduce the above copyright 13 1.1 he * notice, this list of conditions and the following disclaimer in the 14 1.1 he * documentation and/or other materials provided with the distribution. 15 1.1 he * 3. All advertising materials mentioning features or use of this software 16 1.1 he * must display the following acknowledgement: 17 1.1 he * This product includes software developed by Waldi Ravens. 18 1.1 he * 4. The name of the author may not be used to endorse or promote products 19 1.1 he * derived from this software without specific prior written permission 20 1.1 he * 21 1.1 he * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 1.1 he * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 1.1 he * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 1.1 he * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 1.1 he * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 1.1 he * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 1.1 he * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 1.1 he * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 1.1 he * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 1.1 he * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 1.1 he */ 32 1.1 he 33 1.1 he #include "xxboot.h" 34 1.1 he 35 1.1 he #ifdef __ELF__ 36 1.1 he .globl _start, main, fill 37 1.1 he 38 1.1 he .text 39 1.1 he _start: 40 1.1 he #else 41 1.1 he .globl start, main, fill 42 1.1 he 43 1.1 he .text 44 1.1 he start: 45 1.1 he #endif 46 1.1 he /* 47 1.1 he * in: d3 ('DMAr' flag), d4 (SCSI target), d5 (boot pref), d7 (ACSI target) 48 1.1 he */ 49 1.1 he main: lea %pc@(regsav),%a0 50 1.1 he movml %d3-%d5/%d7,%sp@- 51 1.1 he movl %sp,%a0@ 52 1.1 he 53 1.1 he movw #-1,%sp@- 54 1.1 he movw #Kbshift,%sp@- 55 1.1 he trap #BIOS 56 1.1 he addql #4,%sp 57 1.1 he 58 1.1 he tstb %d5 59 1.1 he beqs 0f | no boot preference 60 1.1 he cmpb #0x20,%d5 61 1.1 he bnes exit | bootpref != NetBSD 62 1.1 he 63 1.1 he 0: btst #3,%d0 | Alternate? 64 1.1 he bnes exit 65 1.1 he subql #1,%d0 66 1.1 he movl %d0,%a3 | autoboot flag 67 1.1 he 68 1.1 he movl _membot:w,%d3 69 1.1 he lea MAXBOT,%a4 70 1.1 he cmpl %a4,%d3 71 1.1 he bhis exit | membot > MAXBOT 72 1.1 he 73 1.1 he movl _memtop:w,%d3 74 1.1 he cmpl #MINTOP,%d3 75 1.1 he blts exit | memtop < MINTOP 76 1.1 he 77 1.1 he andw #-4,%d3 78 1.1 he movl %d3,%a0 79 1.1 he movl %sp,%a0@- 80 1.1 he movl %a0,%sp | set new stack 81 1.1 he 82 1.1 he movq #NSEC,%d5 | sector count 83 1.1 he movq #1,%d6 | first sector 84 1.1 he bsrs rds0 85 1.1 he tstl %d0 86 1.1 he bnes 0f 87 1.1 he /* 88 1.1 he * loader (readsector, disklabel, autoboot) 89 1.1 he */ 90 1.1 he pea %a3@ | autoboot 91 1.1 he pea %a4@(LBLST-MAXBOT) | disklabel 92 1.1 he pea %pc@(rds1) | readsector 93 1.1 he jsr %a4@(BXXST-MAXBOT) 94 1.1 he lea %sp@(12),%sp | NetBSD not booted 95 1.1 he 96 1.1 he 0: movl %sp@,%sp | restore BIOS stack 97 1.1 he tstl %d0 98 1.1 he bmis exit 99 1.1 he movl %d0,%sp@(8) | new boot preference 100 1.1 he 101 1.1 he exit: movml %sp@+,%d3-%d5/%d7 102 1.1 he rts 103 1.1 he 104 1.1 he /* 105 1.1 he * int readsec (void *buffer, u_int offset, u_int count); 106 1.1 he */ 107 1.1 he rds1: movml %d2-%d7/%a2-%a6,%sp@- 108 1.1 he movl %pc@(regsav),%a0 109 1.1 he movml %a0@,%d3-%d5/%d7 110 1.1 he movl %sp@(48),%a4 | buffer 111 1.1 he movl %sp@(52),%d6 | offset 112 1.1 he movl %sp@(56),%d3 | count 113 1.1 he 0: movl #255,%d5 114 1.1 he cmpl %d5,%d3 115 1.1 he bccs 1f 116 1.1 he movl %d3,%d5 117 1.1 he 1: bsrs rds0 118 1.1 he tstl %d0 119 1.1 he bnes 2f 120 1.1 he addl #(255*512),%a4 121 1.1 he addl %d5,%d6 122 1.1 he subl %d5,%d3 123 1.1 he bnes 0b 124 1.1 he 2: movml %sp@+,%d2-%d7/%a2-%a6 125 1.1 he rts 126 1.1 he /* 127 1.1 he * in: d4 (target) d5 (count), d6 (offset), a4 (buffer) 128 1.1 he * out: d0 (<= 0) 129 1.1 he * mod: d0, d1, d2, a0, a1, a5, a6 130 1.1 he */ 131 1.1 he rds0: lea %pc@(dpar),%a6 132 1.1 he tstb %a6@ 133 1.1 he bnes 0f 134 1.1 he movb %d4,%d0 135 1.1 he andb #1,%d0 136 1.1 he aslb #4,%d0 137 1.1 he orb #0xa0,%d0 138 1.1 he movb %d0,idesdh:l 139 1.1 he movl %a4,%a0 140 1.1 he movq #0,%d1 141 1.1 he movb #0,idedor:l 142 1.1 he movb #0xec,idecr:l | IDENTIFY DRIVE 143 1.1 he bsrs wait 144 1.1 he bnes err 145 1.1 he movb %a4@(7),%a6@ | tracks/cylinder 146 1.1 he movb %a4@(13),%a6@(1) | sectors/track 147 1.1 he 0: movl %d6,%d1 148 1.1 he movq #0,%d0 149 1.1 he movb %a6@(1),%d0 150 1.1 he movq #0,%d2 151 1.1 he movb %a6@,%d2 152 1.1 he mulu %d0,%d2 153 1.1 he divu %d2,%d1 154 1.1 he movb %d1,idecl:l 155 1.1 he lsrl #8,%d1 156 1.1 he movb %d1,idech:l 157 1.1 he lsrl #8,%d1 158 1.1 he divu %d0,%d1 159 1.1 he movb %d4,%d0 160 1.1 he andb #1,%d0 161 1.1 he aslb #4,%d0 162 1.1 he orb %d0,%d1 163 1.1 he orb #0xa0,%d1 164 1.1 he movb %d1,idesdh:l 165 1.1 he swap %d1 166 1.1 he addqw #1,%d1 167 1.1 he movb %d1,idesn:l 168 1.1 he movl %a4,%a0 169 1.1 he movb %d5,idesc:l 170 1.1 he movw %d5,%d1 171 1.1 he subqw #1,%d1 172 1.1 he movb #0,idedor:l 173 1.1 he movb #0x20,idecr:l 174 1.1 he wait: movl #0x7d0,%d0 175 1.1 he addl _hz_200:w,%d0 176 1.1 he 2: btst #5,gpip:w 177 1.1 he beqs 3f 178 1.1 he cmpl _hz_200:w,%d0 179 1.1 he bhis 2b 180 1.1 he err: movq #-1,%d0 181 1.1 he rts 182 1.1 he 3: movb idesr:l,%d0 183 1.1 he btst #0,%d0 184 1.1 he bnes err 185 1.1 he btst #3,%d0 186 1.1 he beqs err 187 1.1 he movq #63,%d0 188 1.1 he lea idedr:l,%a1 189 1.1 he 4: movw %a1@,%a0@+ 190 1.1 he movw %a1@,%a0@+ 191 1.1 he movw %a1@,%a0@+ 192 1.1 he movw %a1@,%a0@+ 193 1.1 he dbra %d0,4b 194 1.1 he dbra %d1,wait 195 1.1 he movq #0,%d0 196 1.1 he rts 197 1.1 he 198 1.1 he regsav: .long 0 199 1.1 he 200 1.1 he fill: .space 30 201 1.1 he 202 1.1 he dpar: .byte 0 | tracks/cylinder 203 1.1 he .byte 0 | sectors/track 204 1.1 he 205 1.1 he .ascii "NetBSD" 206 1.1 he hd_siz: .long 0 207 1.1 he p0_dsc: .long 0, 0, 0 208 1.1 he p1_dsc: .long 0, 0, 0 209 1.1 he p2_dsc: .long 0, 0, 0 210 1.1 he p3_dsc: .long 0, 0, 0 211 1.1 he bsl_st: .long 0 212 1.1 he bsl_sz: .long 0 213 1.1 he .word 0 214 1.1 he end: 215
Indexes created Sat Oct 18 17:09:52 GMT 2025