xxboot.ahdi.S revision 1.1
1 /* $NetBSD: xxboot.ahdi.S,v 1.1 2003/10/28 11:35:00 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 /* 49 * Fake gemdos-fs bootsector, to keep TOS away. 50 */ 51 .ascii "NetBSD" | oem 52 .byte 0,0,0 | serial 53 .word 0 | bps 54 .byte 0 | spc 55 .word 0 | res 56 .byte 0 | fat 57 .word 0 | ndirs 58 .word 0 | sec 59 .byte 0 | media 60 .word 0 | spf 61 .word 0 | spt 62 .word 0 | side 63 .word 0 | hid 64 .even 65 /* 66 * AHDI rootsector code passes: 67 * d3: SCSI/IDE <-> ACSI flag d4: SCSI/IDE target (or -1) 68 * d5: boot preference d6: offset of boot block 69 * d7: ACSI target a3: pointer to readsector() 70 * a4: pointer to `start' a5: pointer to back-to-ROM 71 */ 72 main: movml %d3-%d7/%a3-%a5,%sp@- 73 lea %pc@(regsav),%a0 74 movl %sp,%a0@ 75 76 movw #-1,%sp@- 77 movw #Kbshift,%sp@- 78 trap #BIOS 79 addql #4,%sp 80 subql #1,%d0 81 movl %d0,%a5 | autoboot flag 82 83 lea %pc@(m_bot),%a6 84 movl _membot:w,%d3 85 lea MAXBOT,%a4 86 cmpl %a4,%d3 87 bhis exit | membot > MAXBOT 88 89 lea %pc@(m_top),%a6 90 movl _memtop:w,%d3 91 cmpl #MINTOP,%d3 92 blts exit | memtop < MINTOP 93 94 andw #-4,%d3 95 movl %d3,%a0 96 movl %sp,%a0@- 97 movl %a0,%sp | set new stack 98 /* 99 * Load secondary boot loader and disklabel. 100 */ 101 movml %a4/%a5,%sp@- 102 movq #NSEC,%d3 | # of sectors 103 addql #1,%d6 | first sector 104 bsr rds1 105 lea %pc@(m_rds),%a6 106 movml %sp@+,%a4/%a5 107 bnes 0f | I/O error 108 /* 109 * int bootxx(readsector, disklabel, autoboot) 110 */ 111 pea %a5@ | autoboot 112 pea %a4@(LBLST-MAXBOT) | disklabel 113 pea %pc@(rds2) | readsector 114 jsr %a4@(BXXST-MAXBOT) 115 lea %pc@(m_sbl),%a6 | NetBSD not booted 116 lea %sp@(12),%sp 117 118 0: movl %sp@,%sp | restore BIOS stack 119 movl %d0,%d3 120 bmis exit 121 movml %sp@+,%d3-%d7/%a3-%a5 122 movl %d0,%d5 | new boot preference 123 jmp %a4@(-0x200) 124 125 exit: bsrs puts | display error 126 lea %pc@(m_key),%a6 127 bsrs puts | wait for key 128 movml %sp@+,%d3-%d7/%a3-%a5 129 jmp %a5@ 130 131 /* 132 * puts (in: a6, d3) 133 */ 134 0: cmpw #35,%d0 | '#' 135 bnes 1f 136 bsrs puti 137 bras puts 138 1: cmpw #64,%d0 | '@' 139 bnes 2f 140 movw #2,%sp@- 141 movw #Bconin,%sp@- 142 trap #BIOS 143 addql #4,%sp 144 bras puts 145 2: bsrs putc 146 puts: movq #0,%d0 147 movb %a6@+,%d0 148 bnes 0b 149 rts 150 151 puti: swap %d3 152 bsrs 0f 153 swap %d3 154 0: rorw #8,%d3 155 bsrs 1f 156 rorw #8,%d3 157 1: rorb #4,%d3 158 bsrs 2f 159 rorb #4,%d3 160 2: movw %d3,%d0 161 andw #15,%d0 162 addw #48,%d0 163 cmpw #58,%d0 164 bcss putc 165 addw #39,%d0 166 putc: movw %d0,%sp@- 167 movw #2,%sp@- 168 movw #Bconout,%sp@- 169 trap #BIOS 170 addql #6,%sp 171 rts 172 /* 173 * int readsec (void *buffer, u_int offset, u_int count); 174 */ 175 rds2: movml %d2-%d7/%a2-%a6,%sp@- 176 movl %pc@(regsav),%a0 177 movml %a0@,%d3-%d7/%a3-%a5 178 movl %sp@(48),%a4 | buffer 179 movl %sp@(52),%d6 | offset 180 movl %sp@(56),%d3 | count 181 bsrs rds1 182 movml %sp@+,%d2-%d7/%a2-%a6 183 rts 184 185 rds1: movl #255,%d5 186 cmpl %d5,%d3 187 bccs 0f 188 movl %d3,%d5 189 0: jsr %a3@ 190 tstl %d0 191 bnes 1f 192 addl #(255*512),%a4 193 addl %d5,%d6 194 subl %d5,%d3 195 bnes rds1 196 1: rts 197 198 m_bot: .asciz "xxboot: membot == 0x#\r\n" 199 m_top: .asciz "xxboot: memtop == 0x#\r\n" 200 m_sbl: .asciz "xxboot: bootxx => 0x#\r\n" 201 m_rds: .asciz "xxboot: Floprd => 0x#\r\n" 202 m_key: .asciz "\007\r\npress any key... @\r\n" 203 204 regsav: .long 0 205 206 fill: .space 54 | 510-(fill-start) 207 .word 0 | checksum 208 end: 209
Indexes created Sun Oct 12 09:09:55 GMT 2025