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/* $OpenBSD: XBUG.S,v 1.4 2003/06/04 16:36:15 deraadt Exp $ */
/*
* Copyright (c) 1995 Theo de Raadt
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Theo says: I wrote a bootrom for the MVME147 *years* ago. To write
* this ROM I copied a few chunks from the old bootrom, like this piece:
*
* "watch this, the moto bastard struck here, shouldn't have hired people
* from intel I tried to tell them...
* "BOOT"
* offset from baseaddr to entry point.
* offset from baseaddr to first word after checksum
* garbage
* checksum made with CS command
* No need to change any of this unless you try to take our names out
* of there. Ie. don't touch."
*/
.text
bootlabel: .ascii "BOOT"
.long bootstart-0xffa00000 | for rom install
.long bootlabelend - bootlabel
.asciz "VME147 rboot Copyright (c) 1995 Theo de Raadt"
.align 2
bootstart: jmp bssclr
.word 0x229c | XXX bitching cksum!
bootlabelend:
.word 0
| clear bss and the kernel location
bssclr: movl #_edata,a0
movl #_end - _edata,d0
1: clrb a0@+
subql #1,d0
bpl 1b
| rip the data segment from ROM into ram..
movl #_etext,a2 | start of data
movl #0x4000,a1 | shovel address
movl #_edata - _etext,d0
1: movb a2@+,a1@+
subql #1,d0
bpl 1b
bra start
|
