sdboot.S revision 1.3
1 1.3 tsutsui /* $NetBSD: sdboot.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 cmpl #0x444d4172,%d3 | SCSI bootdev? 52 1.1 he beqs 0f 53 1.1 he movq #-1,%d4 | no, ACSI 54 1.1 he bras 1f 55 1.1 he 56 1.1 he 0: tstb %d5 57 1.1 he beqs 1f | no boot preference 58 1.1 he cmpb #0x20,%d5 59 1.1 he bnes exit | bootpref != NetBSD 60 1.1 he 61 1.1 he 1: btst #3,%d0 | Alternate? 62 1.1 he bnes exit 63 1.1 he subql #1,%d0 64 1.1 he movl %d0,%a3 | autoboot flag 65 1.1 he 66 1.1 he movl _membot:w,%d0 67 1.1 he lea MAXBOT,%a4 68 1.1 he cmpl %a4,%d0 69 1.1 he bhis exit | membot > MAXBOT 70 1.1 he 71 1.1 he movl _memtop:w,%d0 72 1.1 he cmpl #MINTOP,%d0 73 1.1 he blts exit | memtop < MINTOP 74 1.1 he 75 1.1 he andw #-4,%d0 76 1.1 he movl %d0,%a0 77 1.1 he movl %sp,%a0@- 78 1.1 he movl %a0,%sp | set new stack 79 1.1 he 80 1.1 he movq #NSEC,%d5 | sector count 81 1.1 he movq #1,%d6 | first sector 82 1.1 he bsrs rds0 83 1.1 he tstl %d0 84 1.1 he bnes 0f 85 1.1 he /* 86 1.1 he * loader (readsector, disklabel, autoboot) 87 1.1 he */ 88 1.1 he pea %a3@ | autoboot 89 1.1 he pea %a4@(LBLST-MAXBOT) | disklabel 90 1.1 he pea %pc@(rds1) | readsector 91 1.1 he jsr %a4@(BXXST-MAXBOT) 92 1.1 he lea %sp@(12),%sp | NetBSD not booted 93 1.1 he 94 1.1 he 0: movl %sp@,%sp | restore BIOS stack 95 1.1 he tstl %d0 96 1.1 he bmis exit 97 1.1 he movl %d0,%sp@(8) | new boot preference 98 1.1 he 99 1.1 he exit: movml %sp@+,%d3-%d5/%d7 100 1.1 he rts 101 1.1 he 102 1.1 he /* 103 1.1 he * int readsec (void *buffer, u_int offset, u_int count); 104 1.1 he */ 105 1.1 he rds1: movml %d2-%d7/%a2-%a6,%sp@- 106 1.1 he movl %pc@(regsav),%a0 107 1.1 he movml %a0@,%d3-%d5/%d7 108 1.1 he movl %sp@(48),%a4 | buffer 109 1.1 he movl %sp@(52),%d6 | offset 110 1.1 he movl %sp@(56),%d3 | count 111 1.1 he 0: movl #255,%d5 112 1.1 he cmpl %d5,%d3 113 1.1 he bccs 1f 114 1.1 he movl %d3,%d5 115 1.1 he 1: bsrs rds0 116 1.1 he tstl %d0 117 1.1 he bnes 2f 118 1.1 he addl #(255*512),%a4 119 1.1 he addl %d5,%d6 120 1.1 he subl %d5,%d3 121 1.1 he bnes 0b 122 1.1 he 2: movml %sp@+,%d2-%d7/%a2-%a6 123 1.1 he rts 124 1.1 he /* 125 1.1 he * in: d4/d7 (target) d5 (count), d6 (offset), a4 (buffer) 126 1.1 he * out: d0 (<= 0) 127 1.1 he * mod: d0, d1, d2, a0, a5, a6 128 1.1 he */ 129 1.1 he rds0: tstl %d4 130 1.1 he bmis 0f 131 1.1 he movw %d4,%sp@- | device 132 1.1 he pea %a4@ | buffer 133 1.1 he movw %d5,%sp@- | count 134 1.1 he movl %d6,%sp@- | offset 135 1.1 he movw #DMAread,%sp@- 136 1.1 he trap #XBIOS 137 1.1 he lea %sp@(14),%sp 138 1.1 he rts 139 1.1 he 140 1.1 he 0: st flock:w 141 1.1 he movl _hz_200:w,%d0 142 1.1 he addql #2,%d0 143 1.1 he 1: cmpl _hz_200:w,%d0 144 1.1 he bccs 1b 145 1.1 he movml %d6/%a4,%sp@- 146 1.1 he lea dmahi:w,%a6 147 1.1 he movb %sp@(7),%a6@(4) 148 1.1 he movb %sp@(6),%a6@(2) 149 1.1 he movb %sp@(5),%a6@ 150 1.1 he lea %pc@(r0com),%a6 151 1.1 he movb %sp@(1),%a6@(1) 152 1.1 he movb %sp@(2),%a6@(5) 153 1.1 he movb %sp@(3),%a6@(9) 154 1.1 he movb %d5,%a6@(13) 155 1.1 he addql #8,%sp 156 1.1 he lea dmodus:w,%a6 157 1.1 he lea daccess:w,%a5 158 1.1 he movw #0x198,%a6@ 159 1.1 he movw #0x098,%a6@ 160 1.1 he movw %d5,%a5@ 161 1.1 he movw #0x88,%a6@ 162 1.1 he movq #0,%d0 163 1.1 he movb %d7,%d0 164 1.1 he orb #0x08,%d0 165 1.1 he swap %d0 166 1.1 he movw #0x8a,%d0 167 1.1 he bsrs shake 168 1.1 he lea %pc@(r0com),%a0 169 1.1 he movq #3,%d2 170 1.1 he 2: movl %a0@+,%d0 171 1.1 he bsrs shake 172 1.1 he dbra %d2,2b 173 1.1 he movq #0x0a,%d0 174 1.1 he movl %d0,%a5@ 175 1.1 he movl #0x190,%d1 176 1.1 he bsrs wait 177 1.1 he movw #0x8a,%a6@ 178 1.1 he movw %a5@,%d0 179 1.1 he andw #0xff,%d0 180 1.1 he beqs 0f 181 1.1 he r0err: movq #-1,%d0 182 1.1 he 0: movw #0x80,%a6@ 183 1.1 he clrb flock:w 184 1.1 he r0ret: rts 185 1.1 he 186 1.1 he shake: movl %d0,%a5@ 187 1.1 he movq #0x0a,%d1 188 1.1 he wait: addl _hz_200:w,%d1 189 1.1 he 0: btst #5,gpip:w 190 1.1 he beqs r0ret 191 1.1 he cmpl _hz_200:w,%d1 192 1.1 he bccs 0b 193 1.1 he addql #4,%sp 194 1.1 he bras r0err 195 1.1 he 196 1.1 he r0com: .long 0x0000008a 197 1.1 he .long 0x0000008a 198 1.1 he .long 0x0000008a 199 1.1 he .long 0x0001008a 200 1.1 he 201 1.1 he regsav: .long 0 202 1.1 he 203 1.1 he fill: .space 24 204 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 Wed Oct 22 13:09:56 GMT 2025