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SRT1.c revision 1.1 
      1 /*	$NetBSD: SRT1.c,v 1.1 2001/06/14 12:57:13 fredette Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Gordon W. Ross.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 /* SRT1.c - Stand-alone Run-time startup code, part 1 */
     40 
     41 #include <sys/types.h>
     42 #include <machine/mon.h>
     43 
     44 #include "libsa.h"
     45 #include "dvma.h"
     46 
     47 int _is2 = 0;
     48 int _is3x = 0;
     49 struct sunromvec *_romvec = 0;
     50 void *chain_to_func = 0;
     51 
     52 /*
     53  * These are the function pointers for sun2 vs sun3 vs sun3x stuff.
     54  */
     55 char *	(*dev_mapin_p) __P((int, u_long, int));
     56 char *	(*dvma_alloc_p) __P((int len));
     57 void	(*dvma_free_p) __P((char *dvma, int len));
     58 char *	(*dvma_mapin_p) __P((char *pkt, int len));
     59 void	(*dvma_mapout_p) __P((char *dmabuf, int len));
     60 
     61 /*
     62  * This is called by SRT0.S
     63  * to do final prep for main
     64  */
     65 void
     66 _start()
     67 {
     68 	void **vbr;
     69 	int x;
     70 
     71 	/*
     72 	 * Determine sun2 vs sun3 vs sun3x by looking where the
     73 	 * vector base register points.  The PROM always
     74 	 * points that somewhere into [MONSTART..MONEND]
     75 	 * which is a different range on each.
     76 	 */
     77 
     78 	vbr = getvbr();
     79 	x = (int)vbr & 0xFFF00000;
     80 	if (x == SUN3X_MONSTART)
     81 		_is3x = 1;
     82 	else if (x == 0)
     83 		_is2 = 1;
     84 
     85 	/* Find the PROM vector. */
     86 	if (_is3x)
     87 		x = SUN3X_PROM_BASE;
     88 	else if (_is2)
     89 		x = SUN2_PROM_BASE;
     90 	else
     91 		x = SUN3_PROM_BASE;
     92 	_romvec = ((struct sunromvec *) x);
     93 
     94 	/* Setup trap 14 for use as a breakpoint. */
     95 	vbr[32+14] = _romvec->abortEntry;
     96 
     97 	/* Initialize sun3 vs sun3x function pointers. */
     98 	if (_is3x)
     99 		sun3x_init();
    100 	else if (_is2)
    101 		sun2_init();
    102 	else
    103 		sun3_init();
    104 
    105 	main(0);
    106 	exit();
    107 }
    108 
    109 void
    110 breakpoint()
    111 {
    112 	__asm __volatile ("trap #14");
    113 }
    114 
    115 void
    116 chain_to(func)
    117 	void *func;
    118 {
    119 
    120 	/*
    121 	 * If set, this pointer is jumped-to by exit
    122 	 * after carefully restoring the PROM stack.
    123 	 */
    124 	chain_to_func = func;
    125 	ICIA();
    126 	exit();
    127 }
    128 
    129 /*
    130  * Boot programs in C++ ?  Not likely!
    131  */
    132 void
    133 __main() {}
    134