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

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/*
*
* Copyright (c) 1995 Charles D. Cranor
* All rights reserved.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Charles D. Cranor.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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.
*/
/*
* start: at address 0x4000, load at 0xa000 (so put stack at 0x9ff0)
*/
.text
.globl start
start:
movb #0,_reboot
jra Ldoit
restart:
movb #1,_reboot | fall through
Ldoit:
movl #0x00006ff0,sp
jsr _sboot
Lname:
.ascii "sboot\0"
.globl _go
_go:
clrl d0 | dev lun
clrl d1 | ctrl lun
movl #0x2c, d4 | flags for IPL
movl d0, a0 | address of disk ctrl
movl sp@(4), a1 | entry point of loaded program
movl d0, a2 | media config block (NULL)
movl sp@(8), a3 | nb args (start)
movl sp@(12), a4 | nb end args
movl #Lname, a5 | args
movl #Lname+6, a6 | end args
| SRT0 will set stack
jmp a1@ | GO!