1 /* $NetBSD: sdb00t.ahdi.S,v 1.1.4.3 2004/09/21 13:14:11 skrll Exp $ */
4 * Copyright (c) 1995 Waldi Ravens
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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
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.
36 .globl _start, main, fill
42 .globl start, main, fill
50 main: bclr #2,(_drvbits+3):w
57 btst #3,%d0 | Alternate?
61 cmpl #0x444d4172,%d3 | SCSI bootdev?
63 movq #-1,%d4 | no, ACSI
65 0: movb %d5,%d1 | NVRAM bootpref
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@-
75 movw #NVMaccess, %sp@-
78 moveml %sp@+,%d0-%d2/%a0-%a2
81 movq #-8,%d1 | bootpref = any
83 1: movb %a0@,%d2 | bootflags
91 exit: movml %sp@+,%d3/%d5
92 tostst: clrw _bootdev:w
96 cmpl #0x19870422,%d0 | old TOS?
101 boot: movl %a0@(4),%d6
117 jmp %a4@ | start bootsector code
119 * in: d4/d7 (target) d5 (count), d6 (offset), a4 (buffer)
121 * mod: d0, d1, d2, a0, a1, a5, a6
125 movw %d4,%sp@- | device
127 movw %d5,%sp@- | count
128 movl %d6,%sp@- | offset
137 1: cmpl _hz_200:w,%d0
182 wait: addl _hz_200:w,%d1
190 r0com: .long 0x0000008a
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