Annotation of sys/arch/mvme68k/stand/sboot/XBUG.S, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: XBUG.S,v 1.7 2003/06/04 16:36:14 deraadt Exp $ */
2:
3: /*
4: * Copyright (c) 1989,1990,1995 Theo de Raadt
5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: * 2. Redistributions in binary form must reproduce the above copyright
12: * notice, this list of conditions and the following disclaimer in the
13: * documentation and/or other materials provided with the distribution.
14: *
15: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
16: * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17: * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
19: * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25: * SUCH DAMAGE.
26: */
27:
28: /*
29: * Theo says: I wrote a bootrom for the MVME147 *years* ago. To write
30: * this ROM I copied a few chunks from the old bootrom, like this piece:
31: *
32: * "watch this, the moto bastard struck here, shouldn't have hired people
33: * from intel I tried to tell them...
34: * "BOOT"
35: * offset from baseaddr to entry point.
36: * offset from baseaddr to first word after checksum
37: * garbage
38: * checksum made with CS command
39: * No need to change any of this unless you try to take our names out
40: * of there. Ie. don't touch."
41: */
42:
43: .text
44: bootlabel: .ascii "BOOT"
45: .long bootstart-0xffa00000 | for rom install
46: .long bootlabelend - bootlabel
47: .asciz "VME147 rboot Copyright (c) 1995 Theo de Raadt"
48: .align 2
49: bootstart: jmp bssclr
50: .word 0x229c | XXX bitching cksum!
51: bootlabelend:
52: .word 0
53:
54: | clear bss and the kernel location
55: bssclr: movl #_edata,a0
56: movl #_end,d0
57: subl #_edata,d0
58: 1: clrb a0@+
59: subql #1,d0
60: bpl 1b
61:
62: | rip the data segment from ROM into ram..
63: movl #_etext,a2 | start of data
64: movl #0x4000,a1 | shovel address
65: movl #_edata,d0
66: subl #_etext,d0
67: 1: movb a2@+,a1@+
68: subql #1,d0
69: bpl 1b
70:
71: bra start
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