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start.s revision 1.6 
      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 	movb	#0,_C_LABEL(reboot)
     41 	jra	Ldoit
     42 restart:
     43 	movb	#1,_C_LABEL(reboot) | fall through
     44 
     45 Ldoit:
     46 	movl	#0x00006ff0,%sp
     47 	jsr _C_LABEL(sboot)
     48 
     49 Lname:
     50 	.ascii "sboot\0"
     51 
     52 ENTRY_NOPROFILE(go)
     53 	clrl	%d0		| dev lun
     54 	clrl	%d1		| ctrl lun
     55 	movl	#0x2c, %d4	| flags for IPL
     56 	movl	#0xfffe1800, %a0	| address of "disk" ctrl
     57 	movl	%sp@(4), %a1	| entry point of loaded program
     58 	movl	%d0, %a2	| media config block (NULL)
     59 	movl	%sp@(8), %a3	| nb args (start)
     60 	movl	%sp@(12), %a4	| nb end args
     61 	movl	#Lname, %a5	| args
     62 	movl	#Lname+5, %a6	| end args
     63 				| SRT0 will set stack
     64 	jmp	%a1@		| GO!
     65