1 /* $NetBSD: xxboot.h,v 1.4 1996/12/28 23:37:53 leo Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Waldi Ravens 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 Waldi Ravens. 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 #define BIOS 13 34 #define Bconin 0x02 35 #define Bconout 0x03 36 #define Kbshift 0x0b 37 #define XBIOS 14 38 #define Floprd 0x08 39 #define DMAread 0x2a 40 41 #define _membot 0x0432 42 #define _memtop 0x0436 43 #define flock 0x043e 44 #define _bootdev 0x0446 45 #define _v_bas_ad 0x044e 46 #define _hz_200 0x04ba 47 #define _drvbits 0x04c2 48 #define _sysbase 0x04f2 49 #define pun_ptr 0x0516 50 51 #define daccess 0x8604 52 #define dmodus 0x8606 53 #define dmahi 0x8609 54 #define gpip 0xfa01 55 56 #define rtcrnr 0x8961 57 #define rtcdat 0x8963 58 #define BOOTPREF 15 59 60 #define idesdh 0xfff00019 61 #define idedor 0xfff00005 62 #define idedr 0xfff00000 63 #define idecr 0xfff0001d 64 #define idesr 0xfff0001d 65 #define idesc 0xfff00009 66 #define idesn 0xfff0000d 67 #define idecl 0xfff00011 68 #define idech 0xfff00015 69 70 /* 71 * Boot block format (16 * 512 bytes) 72 * 73 * - first-stage loader : 512 bytes 74 * - magic number : 4 bytes 75 * - disk pack label : 1020 bytes 76 * - second-stage loader: 6656 bytes 77 * 78 * The boot code in ROM loads the first-stage loader, which 79 * in turn loads the remaining 15 sectors and executes the 80 * second-stage loader, which runs at address LOADADDR. 81 */ 82 #define NSEC 15 83 #define LBLSZ 1020 84 #define BXXSZ 6656 85 86 #define BXXST (LOADADDR) 87 #define LBLST (BXXST-LBLSZ) 88 89 /* 90 * Miminum/maximum value for the top/bottom of the memory area 91 * provided by the BIOS. The 1MB minimum memory limit is enough 92 * to load a NetBSD kernel, not to run it. ;-) However, memory 93 * reserved by the BIOS is not available to the boot loaders, 94 * but will be claimed by the NetBSD kernel. 95 */ 96 #define MAXBOT (LBLST-4) 97 #define MINTOP (MAXBOT+0x100000) 98