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Annotation of sys/arch/mvme88k/stand/sboot/XBUG.S, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: XBUG.S,v 1.5 2006/05/16 22:52:26 miod Exp $   */
                      2:
                      3: /*
                      4:  * Copyright (c) 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 - _edata,d0
                     57: 1:             clrb    a0@+
                     58:                subql   #1,d0
                     59:                bpl     1b
                     60:
                     61:                | rip the data segment from ROM into ram..
                     62:                movl    #_etext,a2              | start of data
                     63:                movl    #0x4000,a1              | shovel address
                     64:                movl    #_edata - _etext,d0
                     65: 1:             movb    a2@+,a1@+
                     66:                subql   #1,d0
                     67:                bpl     1b
                     68:
                     69:                bra     start