2 * Copyright (c) 2004 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * $DragonFly: src/sys/boot/i386/Attic/bootasm.h,v 1.2 2004/07/19 01:24:57 dillon Exp $
38 * NOTE: MEM_REL and MEM_ORG also defined in boot2/Makefile
41 #define BOOT0_ORIGIN 0x600 /* boot0 relocated */
42 #define FAKE 0x800 /* Fake partition entry */
43 #define LOAD 0x7c00 /* Load address */
44 #define BOOTINFO_SIZE 0x48 /* bootinfo structure size */
45 #define MEM_ARG_SIZE 0x18
46 #define MEM_PAGE_SIZE 0x1000
47 #define USR_ARGSPACE 0x1000 /* BTX loader / ttl argspace reserved */
48 #define USR_ARGOFFSET (BOOTINFO_SIZE+MEM_ARG_SIZE)
50 #define MEM_REL 0x700 /* Relocation address */
51 #define MEM_ARG 0x900 /* Arguments */
52 #define MEM_ORG 0x7c00 /* Origin */
54 #define BDA_BOOT 0x472 /* Boot howto flag */
55 #define BDA_MEM 0x413 /* Free memory */
56 #define BDA_KEYFLAGS 0x417 /* Keyboard shift-state flags */
57 #define BDA_SCR 0x449 /* Video mode */
58 #define BDA_POS 0x450 /* Cursor position */
59 #define BDA_KEYBOARD 0x496 /* BDA byte with keyboard bit */
61 #define MEM_BTX_ESP 0x1000 /* btxldr top of stack? */
62 #define MEM_BTX_START 0x1000 /* start of BTX memory */
63 #define MEM_BTX_ESP0 0x1800 /* Supervisor stack */
64 #define MEM_BTX_BUF 0x1800 /* Scratch buffer stack */
65 #define MEM_BTX_ESP1 0x1e00 /* Link stack */
66 #define MEM_BTX_IDT 0x1e00 /* IDT */
67 #define MEM_BTX_TSS 0x1f98 /* TSS */
68 #define MEM_BTX_MAP 0x2000 /* I/O bit map */
69 #define MEM_BTX_DIR 0x4000 /* Page directory */
72 * NOTE: page table location is hardwired in /usr/src/usr.sbin/btxld/btx.h
74 #define MEM_BTX_TBL 0x5000 /* Page tables */
77 * NOTE: BOOT2_LOAD_BUF also determines where the btx loader and boot2.bin
78 * code are loaded, since they are all in the boot2 file.
80 #define BOOT2_LOAD_BUF 0x8c00 /* boot1 loads boot2 */
81 #define MEM_BTX_ORG 0x9000 /* base of BTX code */
82 #define MEM_BTX_ENTRY 0x9010 /* BTX starts execution here */
83 #define MEM_BTX_USR 0xa000 /* base of BTX client/user memory */
84 #define MEM_BTX_USR_ARG 0xa100
85 #define MEM_BTX_LDR_OFF MEM_PAGE_SIZE /* offset of btx in the loader */