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      1 /*
      2  * $NetBSD: start.s,v 1.8 2011/02/01 20:19:31 chuck 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  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 /*
     28  * start: at address 0x4000, load at 0xa000 (so put stack at 0x9ff0)
     29  */
     30 
     31 #include <m68k/asm.h>
     32 
     33 	.text
     34 ASENTRY_NOPROFILE(_start)
     35 ASENTRY_NOPROFILE(start)
     36 	movb	#0,_C_LABEL(reboot)
     37 	jra	Ldoit
     38 restart:
     39 	movb	#1,_C_LABEL(reboot) | fall through
     40 
     41 Ldoit:
     42 	movl	#0x00006ff0,%sp
     43 	jsr _C_LABEL(sboot)
     44 
     45 Lname:
     46 	.ascii "sboot\0"
     47 
     48 ENTRY_NOPROFILE(go)
     49 	clrl	%d0		| dev lun
     50 	clrl	%d1		| ctrl lun
     51 	movl	#0x2c, %d4	| flags for IPL
     52 	movl	#0xfffe1800, %a0	| address of "disk" ctrl
     53 	movl	%sp@(4), %a1	| entry point of loaded program
     54 	movl	%d0, %a2	| media config block (NULL)
     55 	movl	%sp@(8), %a3	| nb args (start)
     56 	movl	%sp@(12), %a4	| nb end args
     57 	movl	#Lname, %a5	| args
     58 	movl	#Lname+5, %a6	| end args
     59 				| SRT0 will set stack
     60 	jmp	%a1@		| GO!
     61