sdb00t.ahdi.S revision 1.3
1 /* $NetBSD: sdb00t.ahdi.S,v 1.3 2022/06/26 14:14:46 tsutsui Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Waldi Ravens 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Waldi Ravens. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include "xxboot.h" 34 35 .globl _start, main, fill 36 37 .text 38 39 _start: bras main 40 bra rds0 41 42 main: bclr #2,(_drvbits+3):w 43 clrl pun_ptr:w 44 movml %d3/%d5,%sp@- 45 movw #-1,%sp@- 46 movw #Kbshift,%sp@- 47 trap #BIOS 48 addql #4,%sp 49 btst #3,%d0 | Alternate? 50 bnes exit 51 movq #3,%d0 52 lea %pc@(p0_dsc),%a0 53 cmpl #0x444d4172,%d3 | SCSI bootdev? 54 beqs 0f 55 movq #-1,%d4 | no, ACSI 56 movq #0,%d5 57 0: movb %d5,%d1 | NVRAM bootpref 58 bnes 1f 59 60 | The Hades bios does not provide a bootprev. In case 61 | of doubt, we fetch it ourselves. 62 moveml %d0-%d2/%a0-%a2,%sp@- 63 pea bpref 64 movw #1, %sp@- 65 movw #1, %sp@- 66 movw #0, %sp@- 67 movw #NVMaccess, %sp@- 68 trap #XBIOS 69 lea %sp@(12),%sp 70 moveml %sp@+,%d0-%d2/%a0-%a2 71 movb bpref:w,%d1 72 bnes 1f 73 movq #-8,%d1 | bootpref = any 74 75 1: movb %a0@,%d2 | bootflags 76 btst #0,%d2 77 beqs 2f 78 andb %d1,%d2 79 bnes boot 80 2: lea %a0@(12),%a0 81 dbra %d0,1b 82 83 exit: movml %sp@+,%d3/%d5 84 tostst: clrw _bootdev:w 85 movl _sysbase:w,%a0 86 movl %a0@(24),%d0 87 swap %d0 88 cmpl #0x19870422,%d0 | old TOS? 89 bccs 0f | no 90 movw #0xe0,%d7 91 0: rts 92 93 boot: movl %a0@(4),%d6 94 movq #1,%d5 95 lea %pc@(end),%a4 96 bsrs rds0 97 tstw %d0 98 bnes exit 99 movl %a4,%a0 100 movw #0xff,%d0 101 movq #0,%d1 102 0: addw %a0@+,%d1 103 dbra %d0,0b 104 cmpw #0x1234,%d1 105 bnes exit 106 lea %pc@(rds0),%a3 107 lea %pc@(tostst),%a5 108 movml %sp@+,%d3/%d5 109 jmp %a4@ | start bootsector code 110 /* 111 * in: d4/d7 (target) d5 (count), d6 (offset), a4 (buffer) 112 * out: d0 (<= 0) 113 * mod: d0, d1, d2, a0, a1, a5, a6 114 */ 115 rds0: tstl %d4 116 bmis 0f 117 movw %d4,%sp@- | device 118 pea %a4@ | buffer 119 movw %d5,%sp@- | count 120 movl %d6,%sp@- | offset 121 movw #DMAread,%sp@- 122 trap #XBIOS 123 lea %sp@(14),%sp 124 rts 125 126 0: st flock:w 127 movl _hz_200:w,%d0 128 addql #2,%d0 129 1: cmpl _hz_200:w,%d0 130 bccs 1b 131 movml %d6/%a4,%sp@- 132 lea dmahi:w,%a6 133 movb %sp@(7),%a6@(4) 134 movb %sp@(6),%a6@(2) 135 movb %sp@(5),%a6@ 136 lea %pc@(r0com),%a6 137 movb %sp@(1),%a6@(1) 138 movb %sp@(2),%a6@(5) 139 movb %sp@(3),%a6@(9) 140 movb %d5,%a6@(13) 141 addql #8,%sp 142 lea dmodus:w,%a6 143 lea daccess:w,%a5 144 movw #0x198,%a6@ 145 movw #0x098,%a6@ 146 movw %d5,%a5@ 147 movw #0x88,%a6@ 148 movq #0,%d0 149 movb %d7,%d0 150 orb #0x08,%d0 151 swap %d0 152 movw #0x8a,%d0 153 bsrs shake 154 lea %pc@(r0com),%a0 155 movq #3,%d2 156 2: movl %a0@+,%d0 157 bsrs shake 158 dbra %d2,2b 159 movq #0x0a,%d0 160 movl %d0,%a5@ 161 movl #0x190,%d1 162 bsrs wait 163 movw #0x8a,%a6@ 164 movw %a5@,%d0 165 andw #0xff,%d0 166 beqs 0f 167 r0err: movq #-1,%d0 168 0: movw #0x80,%a6@ 169 clrb flock:w 170 r0ret: rts 171 172 shake: movl %d0,%a5@ 173 movq #0x0a,%d1 174 wait: addl _hz_200:w,%d1 175 0: btst #5,gpip:w 176 beqs r0ret 177 cmpl _hz_200:w,%d1 178 bccs 0b 179 addql #4,%sp 180 bras r0err 181 182 r0com: .long 0x0000008a 183 .long 0x0000008a 184 .long 0x0000008a 185 .long 0x0001008a 186 bpref: .word 0 187 188 fill: .space 16 189 190 .ascii "NetBSD" 191 hd_siz: .long 0 192 p0_dsc: .long 0, 0, 0 193 p1_dsc: .long 0, 0, 0 194 p2_dsc: .long 0, 0, 0 195 p3_dsc: .long 0, 0, 0 196 bsl_st: .long 0 197 bsl_sz: .long 0 198 .word 0 199 end: 200
Indexes created Fri Oct 03 02:09:57 GMT 2025