sdb00t.ahdi.S revision 1.1
1 /* $NetBSD: sdb00t.ahdi.S,v 1.1 2003/10/28 11:34:59 he 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 #ifdef __ELF__ 36 .globl _start, main, fill 37 38 .text 39 40 _start: bras main 41 #else 42 .globl start, main, fill 43 44 .text 45 46 start: bras main 47 #endif 48 bra rds0 49 50 main: bclr #2,(_drvbits+3):w 51 clrl pun_ptr:w 52 movml %d3/%d5,%sp@- 53 movw #-1,%sp@- 54 movw #Kbshift,%sp@- 55 trap #BIOS 56 addql #4,%sp 57 btst #3,%d0 | Alternate? 58 bnes exit 59 movq #3,%d0 60 lea %pc@(p0_dsc),%a0 61 cmpl #0x444d4172,%d3 | SCSI bootdev? 62 beqs 0f 63 movq #-1,%d4 | no, ACSI 64 movq #0,%d5 65 0: movb %d5,%d1 | NVRAM bootpref 66 bnes 1f 67 68 | The Hades bios does not provide a bootprev. In case 69 | of doubt, we fetch it ourselves. 70 moveml %d0-%d2/%a0-%a2,%sp@- 71 pea bpref 72 movw #1, %sp@- 73 movw #1, %sp@- 74 movw #0, %sp@- 75 movw #NVMaccess, %sp@- 76 trap #XBIOS 77 lea %sp@(12),%sp 78 moveml %sp@+,%d0-%d2/%a0-%a2 79 movb bpref:w,%d1 80 bnes 1f 81 movq #-8,%d1 | bootpref = any 82 83 1: movb %a0@,%d2 | bootflags 84 btst #0,%d2 85 beqs 2f 86 andb %d1,%d2 87 bnes boot 88 2: lea %a0@(12),%a0 89 dbra %d0,1b 90 91 exit: movml %sp@+,%d3/%d5 92 tostst: clrw _bootdev:w 93 movl _sysbase:w,%a0 94 movl %a0@(24),%d0 95 swap %d0 96 cmpl #0x19870422,%d0 | old TOS? 97 bccs 0f | no 98 movw #0xe0,%d7 99 0: rts 100 101 boot: movl %a0@(4),%d6 102 movq #1,%d5 103 lea %pc@(end),%a4 104 bsrs rds0 105 tstw %d0 106 bnes exit 107 movl %a4,%a0 108 movw #0xff,%d0 109 movq #0,%d1 110 0: addw %a0@+,%d1 111 dbra %d0,0b 112 cmpw #0x1234,%d1 113 bnes exit 114 lea %pc@(rds0),%a3 115 lea %pc@(tostst),%a5 116 movml %sp@+,%d3/%d5 117 jmp %a4@ | start bootsector code 118 /* 119 * in: d4/d7 (target) d5 (count), d6 (offset), a4 (buffer) 120 * out: d0 (<= 0) 121 * mod: d0, d1, d2, a0, a1, a5, a6 122 */ 123 rds0: tstl %d4 124 bmis 0f 125 movw %d4,%sp@- | device 126 pea %a4@ | buffer 127 movw %d5,%sp@- | count 128 movl %d6,%sp@- | offset 129 movw #DMAread,%sp@- 130 trap #XBIOS 131 lea %sp@(14),%sp 132 rts 133 134 0: st flock:w 135 movl _hz_200:w,%d0 136 addql #2,%d0 137 1: cmpl _hz_200:w,%d0 138 bccs 1b 139 movml %d6/%a4,%sp@- 140 lea dmahi:w,%a6 141 movb %sp@(7),%a6@(4) 142 movb %sp@(6),%a6@(2) 143 movb %sp@(5),%a6@ 144 lea %pc@(r0com),%a6 145 movb %sp@(1),%a6@(1) 146 movb %sp@(2),%a6@(5) 147 movb %sp@(3),%a6@(9) 148 movb %d5,%a6@(13) 149 addql #8,%sp 150 lea dmodus:w,%a6 151 lea daccess:w,%a5 152 movw #0x198,%a6@ 153 movw #0x098,%a6@ 154 movw %d5,%a5@ 155 movw #0x88,%a6@ 156 movq #0,%d0 157 movb %d7,%d0 158 orb #0x08,%d0 159 swap %d0 160 movw #0x8a,%d0 161 bsrs shake 162 lea %pc@(r0com),%a0 163 movq #3,%d2 164 2: movl %a0@+,%d0 165 bsrs shake 166 dbra %d2,2b 167 movq #0x0a,%d0 168 movl %d0,%a5@ 169 movl #0x190,%d1 170 bsrs wait 171 movw #0x8a,%a6@ 172 movw %a5@,%d0 173 andw #0xff,%d0 174 beqs 0f 175 r0err: movq #-1,%d0 176 0: movw #0x80,%a6@ 177 clrb flock:w 178 r0ret: rts 179 180 shake: movl %d0,%a5@ 181 movq #0x0a,%d1 182 wait: addl _hz_200:w,%d1 183 0: btst #5,gpip:w 184 beqs r0ret 185 cmpl _hz_200:w,%d1 186 bccs 0b 187 addql #4,%sp 188 bras r0err 189 190 r0com: .long 0x0000008a 191 .long 0x0000008a 192 .long 0x0000008a 193 .long 0x0001008a 194 bpref: .word 0 195 196 fill: .space 16 197 198 .ascii "NetBSD" 199 hd_siz: .long 0 200 p0_dsc: .long 0, 0, 0 201 p1_dsc: .long 0, 0, 0 202 p2_dsc: .long 0, 0, 0 203 p3_dsc: .long 0, 0, 0 204 bsl_st: .long 0 205 bsl_sz: .long 0 206 .word 0 207 end: 208
Indexes created Tue Oct 07 21:09:53 GMT 2025