1 /* $NetBSD: xxboot.h,v 1.6 2025/11/19 09:43:28 nia 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. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #define BIOS 13 31 #define Bconin 0x02 32 #define Bconout 0x03 33 #define Kbshift 0x0b 34 #define XBIOS 14 35 #define Floprd 0x08 36 #define DMAread 0x2a 37 #define NVMaccess 0x2e 38 39 #define _membot 0x0432 40 #define _memtop 0x0436 41 #define flock 0x043e 42 #define _bootdev 0x0446 43 #define _v_bas_ad 0x044e 44 #define _hz_200 0x04ba 45 #define _drvbits 0x04c2 46 #define _sysbase 0x04f2 47 #define pun_ptr 0x0516 48 49 #define daccess 0x8604 50 #define dmodus 0x8606 51 #define dmahi 0x8609 52 #define gpip 0xfa01 53 54 #define rtcrnr 0x8961 55 #define rtcdat 0x8963 56 #define BOOTPREF 15 57 58 #define idesdh 0xfff00019 59 #define idedor 0xfff00005 60 #define idedr 0xfff00000 61 #define idecr 0xfff0001d 62 #define idesr 0xfff0001d 63 #define idesc 0xfff00009 64 #define idesn 0xfff0000d 65 #define idecl 0xfff00011 66 #define idech 0xfff00015 67 68 /* 69 * Boot block format (16 * 512 bytes) 70 * 71 * - first-stage loader : 512 bytes 72 * - magic number : 4 bytes 73 * - disk pack label : 1020 bytes 74 * - second-stage loader: 6656 bytes 75 * 76 * The boot code in ROM loads the first-stage loader, which 77 * in turn loads the remaining 15 sectors and executes the 78 * second-stage loader, which runs at address LOADADDR. 79 */ 80 #define NSEC 15 81 #define LBLSZ 1020 82 #define BXXSZ 6656 83 84 #define BXXST (LOADADDR) 85 #define LBLST (BXXST-LBLSZ) 86 87 /* 88 * Miminum/maximum value for the top/bottom of the memory area 89 * provided by the BIOS. The 1MB minimum memory limit is enough 90 * to load a NetBSD kernel, not to run it. ;-) However, memory 91 * reserved by the BIOS is not available to the boot loaders, 92 * but will be claimed by the NetBSD kernel. 93 */ 94 #define MAXBOT (LBLST-4) 95 #define MINTOP (MAXBOT+0x100000) 96
Indexes created Sun Feb 22 08:20:21 UTC 2026