wdboot.S revision 1.3
1 1.3 tsutsui /* $NetBSD: wdboot.S,v 1.3 2022/06/26 14:14:46 tsutsui 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 .globl _start, main, fill 36 1.1 he 37 1.1 he .text 38 1.1 he _start: 39 1.1 he /* 40 1.1 he * in: d3 ('DMAr' flag), d4 (SCSI target), d5 (boot pref), d7 (ACSI target) 41 1.1 he */ 42 1.1 he main: lea %pc@(regsav),%a0 43 1.1 he movml %d3-%d5/%d7,%sp@- 44 1.1 he movl %sp,%a0@ 45 1.1 he 46 1.1 he movw #-1,%sp@- 47 1.1 he movw #Kbshift,%sp@- 48 1.1 he trap #BIOS 49 1.1 he addql #4,%sp 50 1.1 he 51 1.1 he tstb %d5 52 1.1 he beqs 0f | no boot preference 53 1.1 he cmpb #0x20,%d5 54 1.1 he bnes exit | bootpref != NetBSD 55 1.1 he 56 1.1 he 0: btst #3,%d0 | Alternate? 57 1.1 he bnes exit 58 1.1 he subql #1,%d0 59 1.1 he movl %d0,%a3 | autoboot flag 60 1.1 he 61 1.1 he movl _membot:w,%d3 62 1.1 he lea MAXBOT,%a4 63 1.1 he cmpl %a4,%d3 64 1.1 he bhis exit | membot > MAXBOT 65 1.1 he 66 1.1 he movl _memtop:w,%d3 67 1.1 he cmpl #MINTOP,%d3 68 1.1 he blts exit | memtop < MINTOP 69 1.1 he 70 1.1 he andw #-4,%d3 71 1.1 he movl %d3,%a0 72 1.1 he movl %sp,%a0@- 73 1.1 he movl %a0,%sp | set new stack 74 1.1 he 75 1.1 he movq #NSEC,%d5 | sector count 76 1.1 he movq #1,%d6 | first sector 77 1.1 he bsrs rds0 78 1.1 he tstl %d0 79 1.1 he bnes 0f 80 1.1 he /* 81 1.1 he * loader (readsector, disklabel, autoboot) 82 1.1 he */ 83 1.1 he pea %a3@ | autoboot 84 1.1 he pea %a4@(LBLST-MAXBOT) | disklabel 85 1.1 he pea %pc@(rds1) | readsector 86 1.1 he jsr %a4@(BXXST-MAXBOT) 87 1.1 he lea %sp@(12),%sp | NetBSD not booted 88 1.1 he 89 1.1 he 0: movl %sp@,%sp | restore BIOS stack 90 1.1 he tstl %d0 91 1.1 he bmis exit 92 1.1 he movl %d0,%sp@(8) | new boot preference 93 1.1 he 94 1.1 he exit: movml %sp@+,%d3-%d5/%d7 95 1.1 he rts 96 1.1 he 97 1.1 he /* 98 1.1 he * int readsec (void *buffer, u_int offset, u_int count); 99 1.1 he */ 100 1.1 he rds1: movml %d2-%d7/%a2-%a6,%sp@- 101 1.1 he movl %pc@(regsav),%a0 102 1.1 he movml %a0@,%d3-%d5/%d7 103 1.1 he movl %sp@(48),%a4 | buffer 104 1.1 he movl %sp@(52),%d6 | offset 105 1.1 he movl %sp@(56),%d3 | count 106 1.1 he 0: movl #255,%d5 107 1.1 he cmpl %d5,%d3 108 1.1 he bccs 1f 109 1.1 he movl %d3,%d5 110 1.1 he 1: bsrs rds0 111 1.1 he tstl %d0 112 1.1 he bnes 2f 113 1.1 he addl #(255*512),%a4 114 1.1 he addl %d5,%d6 115 1.1 he subl %d5,%d3 116 1.1 he bnes 0b 117 1.1 he 2: movml %sp@+,%d2-%d7/%a2-%a6 118 1.1 he rts 119 1.1 he /* 120 1.1 he * in: d4 (target) d5 (count), d6 (offset), a4 (buffer) 121 1.1 he * out: d0 (<= 0) 122 1.1 he * mod: d0, d1, d2, a0, a1, a5, a6 123 1.1 he */ 124 1.1 he rds0: lea %pc@(dpar),%a6 125 1.1 he tstb %a6@ 126 1.1 he bnes 0f 127 1.1 he movb %d4,%d0 128 1.1 he andb #1,%d0 129 1.1 he aslb #4,%d0 130 1.1 he orb #0xa0,%d0 131 1.1 he movb %d0,idesdh:l 132 1.1 he movl %a4,%a0 133 1.1 he movq #0,%d1 134 1.1 he movb #0,idedor:l 135 1.1 he movb #0xec,idecr:l | IDENTIFY DRIVE 136 1.1 he bsrs wait 137 1.1 he bnes err 138 1.1 he movb %a4@(7),%a6@ | tracks/cylinder 139 1.1 he movb %a4@(13),%a6@(1) | sectors/track 140 1.1 he 0: movl %d6,%d1 141 1.1 he movq #0,%d0 142 1.1 he movb %a6@(1),%d0 143 1.1 he movq #0,%d2 144 1.1 he movb %a6@,%d2 145 1.1 he mulu %d0,%d2 146 1.1 he divu %d2,%d1 147 1.1 he movb %d1,idecl:l 148 1.1 he lsrl #8,%d1 149 1.1 he movb %d1,idech:l 150 1.1 he lsrl #8,%d1 151 1.1 he divu %d0,%d1 152 1.1 he movb %d4,%d0 153 1.1 he andb #1,%d0 154 1.1 he aslb #4,%d0 155 1.1 he orb %d0,%d1 156 1.1 he orb #0xa0,%d1 157 1.1 he movb %d1,idesdh:l 158 1.1 he swap %d1 159 1.1 he addqw #1,%d1 160 1.1 he movb %d1,idesn:l 161 1.1 he movl %a4,%a0 162 1.1 he movb %d5,idesc:l 163 1.1 he movw %d5,%d1 164 1.1 he subqw #1,%d1 165 1.1 he movb #0,idedor:l 166 1.1 he movb #0x20,idecr:l 167 1.1 he wait: movl #0x7d0,%d0 168 1.1 he addl _hz_200:w,%d0 169 1.1 he 2: btst #5,gpip:w 170 1.1 he beqs 3f 171 1.1 he cmpl _hz_200:w,%d0 172 1.1 he bhis 2b 173 1.1 he err: movq #-1,%d0 174 1.1 he rts 175 1.1 he 3: movb idesr:l,%d0 176 1.1 he btst #0,%d0 177 1.1 he bnes err 178 1.1 he btst #3,%d0 179 1.1 he beqs err 180 1.1 he movq #63,%d0 181 1.1 he lea idedr:l,%a1 182 1.1 he 4: movw %a1@,%a0@+ 183 1.1 he movw %a1@,%a0@+ 184 1.1 he movw %a1@,%a0@+ 185 1.1 he movw %a1@,%a0@+ 186 1.1 he dbra %d0,4b 187 1.1 he dbra %d1,wait 188 1.1 he movq #0,%d0 189 1.1 he rts 190 1.1 he 191 1.1 he regsav: .long 0 192 1.1 he 193 1.1 he fill: .space 30 194 1.1 he 195 1.1 he dpar: .byte 0 | tracks/cylinder 196 1.1 he .byte 0 | sectors/track 197 1.1 he 198 1.1 he .ascii "NetBSD" 199 1.1 he hd_siz: .long 0 200 1.1 he p0_dsc: .long 0, 0, 0 201 1.1 he p1_dsc: .long 0, 0, 0 202 1.1 he p2_dsc: .long 0, 0, 0 203 1.1 he p3_dsc: .long 0, 0, 0 204 1.1 he bsl_st: .long 0 205 1.1 he bsl_sz: .long 0 206 1.1 he .word 0 207 1.1 he end: 208
Indexes created Sat Oct 18 23:09:54 GMT 2025