1 /* $NetBSD: SRT1.c,v 1.8 2009/01/12 07:00:59 tsutsui 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* SRT1.c - Stand-alone Run-time startup code, part 1 */ 33 34 #include <sys/types.h> 35 #include <sun68k/mon.h> 36 37 #include "libsa.h" 38 #include "dvma.h" 39 40 int _is2 = 0; 41 int _is3x = 0; 42 struct sunromvec *_romvec = 0; 43 void *chain_to_func = 0; 44 45 /* 46 * These are the function pointers for sun2 vs sun3 vs sun3x stuff. 47 */ 48 char * (*dev_mapin_p)(int, u_long, int); 49 char * (*dvma_alloc_p)(int); 50 void (*dvma_free_p)(char *, int); 51 char * (*dvma_mapin_p)(char *, int); 52 void (*dvma_mapout_p)(char *, int); 53 54 /* 55 * This is called by SRT0.S 56 * to do final prep for main 57 */ 58 void 59 _start(void) 60 { 61 void **vbr; 62 int x; 63 64 /* 65 * Determine sun2 vs sun3 vs sun3x by looking where the 66 * vector base register points. The PROM always 67 * points that somewhere into [MONSTART..MONEND] 68 * which is a different range on each. 69 */ 70 71 vbr = getvbr(); 72 x = (int)vbr & 0xFFF00000; 73 if (x == SUN3X_MONSTART) 74 _is3x = 1; 75 else if (x == 0) 76 _is2 = 1; 77 78 /* Find the PROM vector. */ 79 if (_is3x) 80 x = SUN3X_PROM_BASE; 81 else if (_is2) 82 x = SUN2_PROM_BASE; 83 else 84 x = SUN3_PROM_BASE; 85 _romvec = ((struct sunromvec *) x); 86 87 /* Setup trap 14 for use as a breakpoint. */ 88 vbr[32+14] = _romvec->abortEntry; 89 90 /* Initialize sun3 vs sun3x function pointers. */ 91 if (_is3x) 92 sun3x_init(); 93 else if (_is2) 94 sun2_init(); 95 else 96 sun3_init(); 97 98 main(); 99 exit(0); 100 } 101 102 void 103 breakpoint(void) 104 { 105 __asm volatile ("trap #14"); 106 } 107 108 void 109 chain_to(void *func) 110 { 111 112 /* 113 * If set, this pointer is jumped-to by exit 114 * after carefully restoring the PROM stack. 115 */ 116 chain_to_func = func; 117 ICIA(); 118 exit(0); 119 } 120