Annotation of sys/arch/mvme68k/stand/sboot/XBUG.S, Revision 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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