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wdenk7a8e9bed2003-05-31 18:35:21 +00001/*
2 * (C) Copyright 2002
3 * Daniel Engström, Omicron Ceti AB, daniel@omicron.se
wdenk8bde7f72003-06-27 21:31:46 +00004 *
wdenk7a8e9bed2003-05-31 18:35:21 +00005 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 */
23
24#ifndef _BIOS_H_
25#define _BIOS_H_
26
27#define OFFS_ES 0 /* 16bit */
28#define OFFS_GS 2 /* 16bit */
29#define OFFS_DS 4 /* 16bit */
30#define OFFS_EDI 6 /* 32bit */
wdenk8bde7f72003-06-27 21:31:46 +000031#define OFFS_DI 6 /* low 16 bits of EDI */
wdenk7a8e9bed2003-05-31 18:35:21 +000032#define OFFS_ESI 10 /* 32bit */
wdenk8bde7f72003-06-27 21:31:46 +000033#define OFFS_SI 10 /* low 16 bits of ESI */
wdenk7a8e9bed2003-05-31 18:35:21 +000034#define OFFS_EBP 14 /* 32bit */
35#define OFFS_BP 14 /* low 16 bits of EBP */
36#define OFFS_ESP 18 /* 32bit */
37#define OFFS_SP 18 /* low 16 bits of ESP */
38#define OFFS_EBX 22 /* 32bit */
39#define OFFS_BX 22 /* low 16 bits of EBX */
40#define OFFS_BL 22 /* low 8 bits of BX */
41#define OFFS_BH 23 /* high 8 bits of BX */
42#define OFFS_EDX 26 /* 32bit */
43#define OFFS_DX 26 /* low 16 bits of EBX */
44#define OFFS_DL 26 /* low 8 bits of BX */
45#define OFFS_DH 27 /* high 8 bits of BX */
46#define OFFS_ECX 30 /* 32bit */
47#define OFFS_CX 30 /* low 16 bits of EBX */
48#define OFFS_CL 30 /* low 8 bits of BX */
49#define OFFS_CH 31 /* high 8 bits of BX */
50#define OFFS_EAX 34 /* 32bit */
51#define OFFS_AX 34 /* low 16 bits of EBX */
52#define OFFS_AL 34 /* low 8 bits of BX */
53#define OFFS_AH 35 /* high 8 bits of BX */
54#define OFFS_VECTOR 38 /* 16bit */
55#define OFFS_IP 40 /* 16bit */
56#define OFFS_CS 42 /* 16bit */
wdenk8bde7f72003-06-27 21:31:46 +000057#define OFFS_FLAGS 44 /* 16bit */
wdenk7a8e9bed2003-05-31 18:35:21 +000058
59#define SEGMENT 0x40
Wolfgang Denk53677ef2008-05-20 16:00:29 +020060#define STACK 0x800 /* stack at 0x40:0x800 -> 0x800 */
wdenk7a8e9bed2003-05-31 18:35:21 +000061
62/* save general registers */
63/* save some segments */
64/* save callers stack segment .. */
65/* ... in gs */
wdenk8bde7f72003-06-27 21:31:46 +000066 /* setup my segments */
67 /* setup BIOS stackpointer */
68
wdenk7a8e9bed2003-05-31 18:35:21 +000069#define MAKE_BIOS_STACK \
70 pushal ; \
71 pushw %ds ; \
72 pushw %gs ; \
73 pushw %es ; \
74 pushw %ss ; \
75 popw %gs ; \
76 movw $SEGMENT,%ax ; \
77 movw %ax,%ds ; \
78 movw %ax,%es ; \
79 movw %ax,%ss ; \
80 movw %sp,%bp ; \
81 movw $STACK,%sp
82
83#define RESTORE_CALLERS_STACK \
84 pushw %gs ; /* restore callers stack segment */ \
85 popw %ss ; \
86 movw %bp,%sp ; /* restore stackpointer */ \
87 \
88 popw %es ; /* restore segment selectors */ \
89 popw %gs ; \
90 popw %ds ; \
91 \
wdenk8bde7f72003-06-27 21:31:46 +000092 popal /* restore GP registers */
wdenk7a8e9bed2003-05-31 18:35:21 +000093
94#endif