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start.s revision 1.2 
      1 /*
      2  *
      3  * Copyright (c) 1995 Charles D. Cranor
      4  * All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *      This product includes software developed by Charles D. Cranor.
     17  * 4. The name of the author may not be used to endorse or promote products
     18  *    derived from this software without specific prior written permission.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 /*
     32  * start: at address 0x4000, load at 0xa000 (so put stack at 0x9ff0)
     33  */
     34 
     35 .text
     36 .globl start
     37 start:
     38 	movb	#0,_reboot
     39 	jra	Ldoit
     40 restart:
     41 	movb	#1,_reboot | fall through
     42 
     43 Ldoit:
     44 	movl	#0x00006ff0,sp
     45 	jsr _sboot
     46 
     47 Lname:
     48 	.ascii "sboot\0"
     49 
     50 .globl  _go
     51 _go:
     52 	clrl	d0		| dev lun
     53 	clrl	d1		| ctrl lun
     54 	movl	#0x2c, d4	| flags for IPL
     55 	movl	d0, a0		| address of disk ctrl
     56 	movl	sp@(4), a1	| entry point of loaded program
     57 	movl	d0, a2		| media config block (NULL)
     58 	movl	sp@(8), a3	| nb args (start)
     59 	movl	sp@(12), a4	| nb end args
     60 	movl	#Lname, a5	| args
     61 	movl	#Lname+6, a6	| end args
     62 				| SRT0 will set stack
     63 	jmp	a1@		| GO!
     64