summaryrefslogtreecommitdiff
path: root/pc-bios/optionrom/optionrom.h
blob: ce436085d9ba9e3a97229d0bf59b38b57942848d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
/*
 * Common Option ROM Functions
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 * Copyright Novell Inc, 2009
 *   Authors: Alexander Graf <agraf@suse.de>
 */


#define NO_QEMU_PROTOS
#include "../../include/hw/nvram/fw_cfg.h"

#define BIOS_CFG_IOPORT_CFG	0x510
#define BIOS_CFG_IOPORT_DATA	0x511

/* Break the translation block flow so -d cpu shows us values */
#define DEBUG_HERE \
	jmp		1f;				\
	1:
	
/*
 * Read a variable from the fw_cfg device.
 * Clobbers:	%edx
 * Out:		%eax
 */
.macro read_fw VAR
	mov		$\VAR, %ax
	mov		$BIOS_CFG_IOPORT_CFG, %dx
	outw		%ax, (%dx)
	mov		$BIOS_CFG_IOPORT_DATA, %dx
	inb		(%dx), %al
	shl		$8, %eax
	inb		(%dx), %al
	shl		$8, %eax
	inb		(%dx), %al
	shl		$8, %eax
	inb		(%dx), %al
	bswap		%eax
.endm

#define read_fw_blob_pre(var)				\
	read_fw		var ## _ADDR;			\
	mov		%eax, %edi;			\
	read_fw		var ## _SIZE;			\
	mov		%eax, %ecx;			\
	mov		$var ## _DATA, %ax;		\
	mov		$BIOS_CFG_IOPORT_CFG, %edx;	\
	outw		%ax, (%dx);			\
	mov		$BIOS_CFG_IOPORT_DATA, %dx;	\
	cld

/*
 * Read a blob from the fw_cfg device.
 * Requires _ADDR, _SIZE and _DATA values for the parameter.
 *
 * Clobbers:	%eax, %edx, %es, %ecx, %edi
 */
#define read_fw_blob(var)				\
	read_fw_blob_pre(var);				\
	/* old as(1) doesn't like this insn so emit the bytes instead: \
	rep insb	(%dx), %es:(%edi);		\
	*/						\
	.dc.b		0xf3,0x6c

/*
 * Read a blob from the fw_cfg device in forced addr32 mode.
 * Requires _ADDR, _SIZE and _DATA values for the parameter.
 *
 * Clobbers:	%eax, %edx, %es, %ecx, %edi
 */
#define read_fw_blob_addr32(var)				\
	read_fw_blob_pre(var);				\
	/* old as(1) doesn't like this insn so emit the bytes instead: \
	addr32 rep insb	(%dx), %es:(%edi);		\
	*/						\
	.dc.b		0x67,0xf3,0x6c

#define OPTION_ROM_START					\
    .code16;						\
    .text;						\
	.global 	_start;				\
    _start:;						\
	.short		0xaa55;				\
	.byte		(_end - _start) / 512;

#define BOOT_ROM_START					\
	OPTION_ROM_START				\
	lret;						\
	.org 		0x18;				\
	.short		0;				\
	.short		_pnph;				\
    _pnph:						\
	.ascii		"$PnP";				\
	.byte		0x01;				\
	.byte		( _pnph_len / 16 );		\
	.short		0x0000;				\
	.byte		0x00;				\
	.byte		0x00;				\
	.long		0x00000000;			\
	.short		_manufacturer;			\
	.short		_product;			\
	.long		0x00000000;			\
	.short		0x0000;				\
	.short		0x0000;				\
	.short		_bev;				\
	.short		0x0000;				\
	.short		0x0000;				\
	.equ		_pnph_len, . - _pnph;		\
    _bev:;						\
	/* DS = CS */					\
	movw		%cs, %ax;			\
	movw		%ax, %ds;

#define OPTION_ROM_END					\
	.byte		0;				\
	.align		512, 0;				\
    _end:

#define BOOT_ROM_END					\
    _manufacturer:;					\
	.asciz "QEMU";					\
    _product:;						\
	.asciz BOOT_ROM_PRODUCT;			\
	OPTION_ROM_END