wdb00t.ahdi.S revision 1.3
1 /* $NetBSD: wdb00t.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 movb %d5,%d1 | NVRAM bootpref 54 bnes 0f 55 56 | The Hades bios does not provide a bootprev. In case 57 | of doubt, we fetch it ourselves. 58 movb #BOOTPREF,rtcrnr:w 59 movb rtcdat:w,%d1 60 bnes 0f 61 movq #-8,%d1 | bootpref = any 62 63 0: movb %a0@,%d2 | bootflags 64 btst #0,%d2 65 beqs 1f 66 andb %d1,%d2 67 bnes boot 68 1: lea %a0@(12),%a0 69 dbra %d0,0b 70 71 exit: movml %sp@+,%d3/%d5 72 tostst: clrw _bootdev:w 73 movl _sysbase:w,%a0 74 movl %a0@(24),%d0 75 swap %d0 76 cmpl #0x19870422,%d0 | old TOS? 77 bccs 0f | no 78 movw #0xe0,%d7 79 0: rts 80 81 boot: movl %a0@(4),%d6 82 movq #1,%d5 83 lea %pc@(end),%a4 84 bsrs rds0 85 tstw %d0 86 bnes exit 87 movl %a4,%a0 88 movw #0xff,%d0 89 movq #0,%d1 90 0: addw %a0@+,%d1 91 dbra %d0,0b 92 cmpw #0x1234,%d1 93 bnes exit 94 lea %pc@(rds0),%a3 95 lea %pc@(tostst),%a5 96 movml %sp@+,%d3/%d5 97 jmp %a4@ | start bootsector code 98 /* 99 * in: d4 (target) d5 (count), d6 (offset), a4 (buffer) 100 * out: d0 (<= 0) 101 * mod: d0, d1, d2, a0, a1, a5, a6 102 */ 103 rds0: lea %pc@(dpar),%a6 104 tstb %a6@ 105 bnes 0f 106 movb %d4,%d0 107 andb #1,%d0 108 aslb #4,%d0 109 orb #0xa0,%d0 110 movb %d0,idesdh:l 111 movl %a4,%a0 112 movq #0,%d1 113 movb #0,idedor:l 114 movb #0xec,idecr:l | IDENTIFY DRIVE 115 bsrs wait 116 bnes err 117 movb %a4@(7),%a6@ | tracks/cylinder 118 movb %a4@(13),%a6@(1) | sectors/track 119 0: movl %d6,%d1 120 movq #0,%d0 121 movb %a6@(1),%d0 122 movq #0,%d2 123 movb %a6@,%d2 124 mulu %d0,%d2 125 divu %d2,%d1 126 movb %d1,idecl:l 127 lsrl #8,%d1 128 movb %d1,idech:l 129 lsrl #8,%d1 130 divu %d0,%d1 131 movb %d4,%d0 132 andb #1,%d0 133 aslb #4,%d0 134 orb %d0,%d1 135 orb #0xa0,%d1 136 movb %d1,idesdh:l 137 swap %d1 138 addqw #1,%d1 139 movb %d1,idesn:l 140 movl %a4,%a0 141 movb %d5,idesc:l 142 movw %d5,%d1 143 subqw #1,%d1 144 movb #0,idedor:l 145 movb #0x20,idecr:l 146 wait: movl #0x7d0,%d0 147 addl _hz_200:w,%d0 148 2: btst #5,gpip:w 149 beqs 3f 150 cmpl _hz_200:w,%d0 151 bhis 2b 152 err: movq #-1,%d0 153 rts 154 3: movb idesr:l,%d0 155 btst #0,%d0 156 bnes err 157 btst #3,%d0 158 beqs err 159 movq #63,%d0 160 lea idedr:l,%a1 161 4: movw %a1@,%a0@+ 162 movw %a1@,%a0@+ 163 movw %a1@,%a0@+ 164 movw %a1@,%a0@+ 165 dbra %d0,4b 166 dbra %d1,wait 167 movq #0,%d0 168 rts 169 170 fill: .space 52 171 172 dpar: .byte 0 | tracks/cylinder 173 .byte 0 | sectors/track 174 .ascii "NetBSD" 175 hd_siz: .long 0 176 p0_dsc: .long 0, 0, 0 177 p1_dsc: .long 0, 0, 0 178 p2_dsc: .long 0, 0, 0 179 p3_dsc: .long 0, 0, 0 180 bsl_st: .long 0 181 bsl_sz: .long 0 182 .word 0 183 end: 184
Indexes created Tue Oct 14 21:09:58 GMT 2025