sys/arch/mvme68k/stand/sboot/start.s

   1 /*
   2  * $NetBSD: start.s,v 1.6 2000/11/30 22:26:27 scw Exp $
   3  *
   4  * Copyright (c) 1995 Charles D. Cranor
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by Charles D. Cranor.
  18  * 4. The name of the author may not be used to endorse or promote products
  19  *    derived from this software without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32 /*
  33  * start: at address 0x4000, load at 0xa000 (so put stack at 0x9ff0)
  34  */
  35
  36 #include <m68k/asm.h>
  37
  38         .text
  39 ASENTRY_NOPROFILE(_start)
  40 ASENTRY_NOPROFILE(start)
  41         movb    #0,_C_LABEL(reboot)
  42         jra     Ldoit
  43 restart:
  44         movb    #1,_C_LABEL(reboot) | fall through
  45
  46 Ldoit:
  47         movl    #0x00006ff0,%sp
  48         jsr _C_LABEL(sboot)
  49
  50 Lname:
  51         .ascii "sboot\0"
  52
  53 ENTRY_NOPROFILE(go)
  54         clrl    %d0             | dev lun
  55         clrl    %d1             | ctrl lun
  56         movl    #0x2c, %d4      | flags for IPL
  57         movl    #0xfffe1800, %a0        | address of "disk" ctrl
  58         movl    %sp@(4), %a1    | entry point of loaded program
  59         movl    %d0, %a2        | media config block (NULL)
  60         movl    %sp@(8), %a3    | nb args (start)
  61         movl    %sp@(12), %a4   | nb end args
  62         movl    #Lname, %a5     | args
  63         movl    #Lname+5, %a6   | end args
  64                                 | SRT0 will set stack
  65         jmp     %a1@            | GO!