/*      $NetBSD: xxboot.h,v 1.7 2026/05/20 21:05:11 andvar Exp $        */

/*
 * Copyright (c) 1995 Waldi Ravens
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#define BIOS            13
#define Bconin          0x02
#define Bconout         0x03
#define Kbshift         0x0b
#define XBIOS           14
#define Floprd          0x08
#define DMAread         0x2a
#define NVMaccess       0x2e

#define _membot         0x0432
#define _memtop         0x0436
#define flock           0x043e
#define _bootdev        0x0446
#define _v_bas_ad       0x044e
#define _hz_200         0x04ba
#define _drvbits        0x04c2
#define _sysbase        0x04f2
#define pun_ptr         0x0516

#define daccess         0x8604
#define dmodus          0x8606
#define dmahi           0x8609
#define gpip            0xfa01

#define rtcrnr          0x8961
#define rtcdat          0x8963
#define BOOTPREF        15

#define idesdh          0xfff00019
#define idedor          0xfff00005
#define idedr           0xfff00000
#define idecr           0xfff0001d
#define idesr           0xfff0001d
#define idesc           0xfff00009
#define idesn           0xfff0000d
#define idecl           0xfff00011
#define idech           0xfff00015

/*
 * Boot block format (16 * 512 bytes)
 *
 * - first-stage loader :  512 bytes
 * - magic number       :    4 bytes
 * - disk pack label    : 1020 bytes
 * - second-stage loader: 6656 bytes
 *
 * The boot code in ROM loads the first-stage loader, which
 * in turn loads the remaining 15 sectors and executes the
 * second-stage loader, which runs at address LOADADDR.
 */
#define NSEC            15
#define LBLSZ           1020
#define BXXSZ           6656

#define BXXST           (LOADADDR)
#define LBLST           (BXXST-LBLSZ)

/*
 * Minimum/maximum value for the top/bottom  of the memory area
 * provided by the BIOS. The 1MB minimum memory limit is enough
 * to load a NetBSD kernel, not to run it. ;-) However, memory
 * reserved by the BIOS is not available to the boot loaders,
 * but will be claimed by the NetBSD kernel.
 */
#define MAXBOT          (LBLST-4)
#define MINTOP          (MAXBOT+0x100000)