sys/arch/amiga/stand/bootblock/bootxx_ffs/startit.s

   1 /*      $NetBSD: startit.s,v 1.2 2002/05/20 05:58:45 mhitch Exp $       */
   2
   3 /*
   4  * Copyright (c) 1996 Ignatios Souvatzis
   5  * Copyright (c) 1994 Michael L. Hitch
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  *
  29  * From: $NetBSD: startit.s,v 1.2 2002/05/20 05:58:45 mhitch Exp $
  30  */
  31 #include "machine/asm.h"
  32
  33         .set    ABSEXECBASE,4
  34
  35         .text
  36
  37 ENTRY_NOPROFILE(startit)
  38         movel   4:w,%a6                 | SysBase
  39         movel   %sp@(4),%a0             | Boot loader address
  40         movel   %sp@(8),%a1             | IOR
  41         movel   %sp@(12),%a5            | Console data
  42 /*
  43  * Installboot can modify the default command in the bootblock loader,
  44  * but boot.amiga uses the default command in boot.amiga.  Copy the
  45  * possibly modified default command before entering the boot loader.
  46  */
  47         lea     %pc@(_C_LABEL(default_command)),%a2
  48         lea     %a0@(16),%a3
  49         moveq   #(32/4)-1,%d0
  50 Lcommand:
  51         movel   %a2@+,%a3@+
  52         dbra    %d0,Lcommand
  53
  54         jsr     %a0@(12)
  55         rts