aboutsummaryrefslogtreecommitdiff
path: root/hw/display/vga.h
blob: d917046da6479f3dcaa9a539b8209d5116dc2947 (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
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
/*
 * linux/include/video/vga.h -- standard VGA chipset interaction
 *
 * Copyright 1999 Jeff Garzik <jgarzik@pobox.com>
 *
 * Copyright history from vga16fb.c:
 *	Copyright 1999 Ben Pfaff and Petr Vandrovec
 *	Based on VGA info at http://www.osdever.net/FreeVGA/home.htm
 *	Based on VESA framebuffer (c) 1998 Gerd Knorr
 *
 * This file is subject to the terms and conditions of the GNU General
 * Public License.  See the file COPYING in the main directory of this
 * archive for more details.
 *
 */

#ifndef __linux_video_vga_h__
#define __linux_video_vga_h__

/* Some of the code below is taken from SVGAlib.  The original,
   unmodified copyright notice for that code is below. */
/* VGAlib version 1.2 - (c) 1993 Tommy Frandsen                    */
/*                                                                 */
/* This library is free software; you can redistribute it and/or   */
/* modify it without any restrictions. This library is distributed */
/* in the hope that it will be useful, but without any warranty.   */

/* Multi-chipset support Copyright 1993 Harm Hanemaayer */
/* partially copyrighted (C) 1993 by Hartmut Schirmer */

/* VGA data register ports */
#define VGA_CRT_DC      0x3D5   /* CRT Controller Data Register - color emulation */
#define VGA_CRT_DM      0x3B5   /* CRT Controller Data Register - mono emulation */
#define VGA_ATT_R       0x3C1   /* Attribute Controller Data Read Register */
#define VGA_ATT_W       0x3C0   /* Attribute Controller Data Write Register */
#define VGA_GFX_D       0x3CF   /* Graphics Controller Data Register */
#define VGA_SEQ_D       0x3C5   /* Sequencer Data Register */
#define VGA_MIS_R       0x3CC   /* Misc Output Read Register */
#define VGA_MIS_W       0x3C2   /* Misc Output Write Register */
#define VGA_FTC_R       0x3CA   /* Feature Control Read Register */
#define VGA_IS1_RC      0x3DA   /* Input Status Register 1 - color emulation */
#define VGA_IS1_RM      0x3BA   /* Input Status Register 1 - mono emulation */
#define VGA_PEL_D       0x3C9   /* PEL Data Register */
#define VGA_PEL_MSK     0x3C6   /* PEL mask register */

/* EGA-specific registers */
#define EGA_GFX_E0      0x3CC   /* Graphics enable processor 0 */
#define EGA_GFX_E1      0x3CA   /* Graphics enable processor 1 */

/* VGA index register ports */
#define VGA_CRT_IC      0x3D4   /* CRT Controller Index - color emulation */
#define VGA_CRT_IM      0x3B4   /* CRT Controller Index - mono emulation */
#define VGA_ATT_IW      0x3C0   /* Attribute Controller Index & Data Write Register */
#define VGA_GFX_I       0x3CE   /* Graphics Controller Index */
#define VGA_SEQ_I       0x3C4   /* Sequencer Index */
#define VGA_PEL_IW      0x3C8   /* PEL Write Index */
#define VGA_PEL_IR      0x3C7   /* PEL Read Index */

/* standard VGA indexes max counts */
#define VGA_CRT_C       0x19    /* Number of CRT Controller Registers */
#define VGA_ATT_C       0x15    /* Number of Attribute Controller Registers */
#define VGA_GFX_C       0x09    /* Number of Graphics Controller Registers */
#define VGA_SEQ_C       0x05    /* Number of Sequencer Registers */
#define VGA_MIS_C       0x01    /* Number of Misc Output Register */

/* VGA misc register bit masks */
#define VGA_MIS_COLOR           0x01
#define VGA_MIS_ENB_MEM_ACCESS  0x02
#define VGA_MIS_DCLK_28322_720  0x04
#define VGA_MIS_ENB_PLL_LOAD    (0x04 | 0x08)
#define VGA_MIS_SEL_HIGH_PAGE   0x20

/* VGA CRT controller register indices */
#define VGA_CRTC_H_TOTAL        0
#define VGA_CRTC_H_DISP         1
#define VGA_CRTC_H_BLANK_START  2
#define VGA_CRTC_H_BLANK_END    3
#define VGA_CRTC_H_SYNC_START   4
#define VGA_CRTC_H_SYNC_END     5
#define VGA_CRTC_V_TOTAL        6
#define VGA_CRTC_OVERFLOW       7
#define VGA_CRTC_PRESET_ROW     8
#define VGA_CRTC_MAX_SCAN       9
#define VGA_CRTC_CURSOR_START   0x0A
#define VGA_CRTC_CURSOR_END     0x0B
#define VGA_CRTC_START_HI       0x0C
#define VGA_CRTC_START_LO       0x0D
#define VGA_CRTC_CURSOR_HI      0x0E
#define VGA_CRTC_CURSOR_LO      0x0F
#define VGA_CRTC_V_SYNC_START   0x10
#define VGA_CRTC_V_SYNC_END     0x11
#define VGA_CRTC_V_DISP_END     0x12
#define VGA_CRTC_OFFSET         0x13
#define VGA_CRTC_UNDERLINE      0x14
#define VGA_CRTC_V_BLANK_START  0x15
#define VGA_CRTC_V_BLANK_END    0x16
#define VGA_CRTC_MODE           0x17
#define VGA_CRTC_LINE_COMPARE   0x18
#define VGA_CRTC_REGS           VGA_CRT_C

/* VGA CRT controller bit masks */
#define VGA_CR11_LOCK_CR0_CR7   0x80 /* lock writes to CR0 - CR7 */
#define VGA_CR17_H_V_SIGNALS_ENABLED 0x80

/* VGA attribute controller register indices */
#define VGA_ATC_PALETTE0        0x00
#define VGA_ATC_PALETTE1        0x01
#define VGA_ATC_PALETTE2        0x02
#define VGA_ATC_PALETTE3        0x03
#define VGA_ATC_PALETTE4        0x04
#define VGA_ATC_PALETTE5        0x05
#define VGA_ATC_PALETTE6        0x06
#define VGA_ATC_PALETTE7        0x07
#define VGA_ATC_PALETTE8        0x08
#define VGA_ATC_PALETTE9        0x09
#define VGA_ATC_PALETTEA        0x0A
#define VGA_ATC_PALETTEB        0x0B
#define VGA_ATC_PALETTEC        0x0C
#define VGA_ATC_PALETTED        0x0D
#define VGA_ATC_PALETTEE        0x0E
#define VGA_ATC_PALETTEF        0x0F
#define VGA_ATC_MODE            0x10
#define VGA_ATC_OVERSCAN        0x11
#define VGA_ATC_PLANE_ENABLE    0x12
#define VGA_ATC_PEL             0x13
#define VGA_ATC_COLOR_PAGE      0x14

#define VGA_AR_ENABLE_DISPLAY   0x20

/* VGA sequencer register indices */
#define VGA_SEQ_RESET           0x00
#define VGA_SEQ_CLOCK_MODE      0x01
#define VGA_SEQ_PLANE_WRITE     0x02
#define VGA_SEQ_CHARACTER_MAP   0x03
#define VGA_SEQ_MEMORY_MODE     0x04

/* VGA sequencer register bit masks */
#define VGA_SR01_CHAR_CLK_8DOTS 0x01 /* bit 0: character clocks 8 dots wide are generated */
#define VGA_SR01_SCREEN_OFF     0x20 /* bit 5: Screen is off */
#define VGA_SR02_ALL_PLANES     0x0F /* bits 3-0: enable access to all planes */
#define VGA_SR04_EXT_MEM        0x02 /* bit 1: allows complete mem access to 256K */
#define VGA_SR04_SEQ_MODE       0x04 /* bit 2: directs system to use a sequential addressing mode */
#define VGA_SR04_CHN_4M         0x08 /* bit 3: selects modulo 4 addressing for CPU access to display memory */

/* VGA graphics controller register indices */
#define VGA_GFX_SR_VALUE        0x00
#define VGA_GFX_SR_ENABLE       0x01
#define VGA_GFX_COMPARE_VALUE   0x02
#define VGA_GFX_DATA_ROTATE     0x03
#define VGA_GFX_PLANE_READ      0x04
#define VGA_GFX_MODE            0x05
#define VGA_GFX_MISC            0x06
#define VGA_GFX_COMPARE_MASK    0x07
#define VGA_GFX_BIT_MASK        0x08

/* VGA graphics controller bit masks */
#define VGA_GR06_GRAPHICS_MODE  0x01

#endif /* __linux_video_vga_h__ */