ReactOS 0.4.15-dev-7788-g1ad9096
vga.h
Go to the documentation of this file.
1/*
2 * PROJECT: ReactOS VGA Miniport Driver
3 * LICENSE: Microsoft NT4 DDK Sample Code License
4 * PURPOSE: Definitions for VGA
5 * PROGRAMMERS: Copyright (c) 1992 Microsoft Corporation
6 * ReactOS Portable Systems Group
7 */
8
9#ifndef _BOOTVID_VGA_H_
10#define _BOOTVID_VGA_H_
11
12#pragma once
13
14#include "cmdcnst.h"
15
16//
17// Base address of VGA memory range. Also used as base address of VGA
18// memory when loading a font, which is done with the VGA mapped at A0000.
19//
20
21#define MEM_VGA 0xA0000
22#define MEM_VGA_SIZE 0x20000
23
24//
25// For memory mapped IO
26//
27
28#define MEMORY_MAPPED_IO_OFFSET (0xB8000 - 0xA0000)
29
30//
31// Port definitions for filling the ACCESS_RANGES structure in the miniport
32// information, defines the range of I/O ports the VGA spans.
33// There is a break in the IO ports - a few ports are used for the parallel
34// port. Those cannot be defined in the ACCESS_RANGE, but are still mapped
35// so all VGA ports are in one address range.
36//
37
38#define VGA_BASE_IO_PORT 0x000003B0
39#define VGA_START_BREAK_PORT 0x000003BB
40#define VGA_END_BREAK_PORT 0x000003C0
41#define VGA_MAX_IO_PORT 0x000003DF
42
43//
44// VGA register definitions
45//
46// eVb: 3.1 [VGA] - Use offsets from the VGA Port Address instead of absolute
47#define CRTC_ADDRESS_PORT_MONO 0x0004 // CRT Controller Address and
48#define CRTC_DATA_PORT_MONO 0x0005 // Data registers in mono mode
49#define FEAT_CTRL_WRITE_PORT_MONO 0x000A // Feature Control write port
50 // in mono mode
51#define INPUT_STATUS_1_MONO 0x000A // Input Status 1 register read
52 // port in mono mode
53#define ATT_INITIALIZE_PORT_MONO INPUT_STATUS_1_MONO
54 // Register to read to reset
55 // Attribute Controller index/data
56
57#define ATT_ADDRESS_PORT 0x0010 // Attribute Controller Address and
58#define ATT_DATA_WRITE_PORT 0x0010 // Data registers share one port
59 // for writes, but only Address is
60 // readable at 0x3C0
61#define ATT_DATA_READ_PORT 0x0011 // Attribute Controller Data reg is
62 // readable here
63#define MISC_OUTPUT_REG_WRITE_PORT 0x0012 // Miscellaneous Output reg write
64 // port
65#define INPUT_STATUS_0_PORT 0x0012 // Input Status 0 register read
66 // port
67#define VIDEO_SUBSYSTEM_ENABLE_PORT 0x0013 // Bit 0 enables/disables the
68 // entire VGA subsystem
69#define SEQ_ADDRESS_PORT 0x0014 // Sequence Controller Address and
70#define SEQ_DATA_PORT 0x0015 // Data registers
71#define DAC_PIXEL_MASK_PORT 0x0016 // DAC pixel mask reg
72#define DAC_ADDRESS_READ_PORT 0x0017 // DAC register read index reg,
73 // write-only
74#define DAC_STATE_PORT 0x0017 // DAC state (read/write),
75 // read-only
76#define DAC_ADDRESS_WRITE_PORT 0x0018 // DAC register write index reg
77#define DAC_DATA_REG_PORT 0x0019 // DAC data transfer reg
78#define FEAT_CTRL_READ_PORT 0x001A // Feature Control read port
79#define MISC_OUTPUT_REG_READ_PORT 0x001C // Miscellaneous Output reg read
80 // port
81#define GRAPH_ADDRESS_PORT 0x001E // Graphics Controller Address
82#define GRAPH_DATA_PORT 0x001F // and Data registers
83
84#define CRTC_ADDRESS_PORT_COLOR 0x0024 // CRT Controller Address and
85#define CRTC_DATA_PORT_COLOR 0x0025 // Data registers in color mode
86#define FEAT_CTRL_WRITE_PORT_COLOR 0x002A // Feature Control write port
87#define INPUT_STATUS_1_COLOR 0x002A // Input Status 1 register read
88 // port in color mode
89// eVb: 3.2 [END]
90#define ATT_INITIALIZE_PORT_COLOR INPUT_STATUS_1_COLOR
91 // Register to read to reset
92 // Attribute Controller index/data
93 // toggle in color mode
94
95//
96// VGA indexed register indexes.
97//
98
99#define IND_CURSOR_START 0x0A // index in CRTC of the Cursor Start
100#define IND_CURSOR_END 0x0B // and End registers
101#define IND_CURSOR_HIGH_LOC 0x0E // index in CRTC of the Cursor Location
102#define IND_CURSOR_LOW_LOC 0x0F // High and Low Registers
103#define IND_VSYNC_END 0x11 // index in CRTC of the Vertical Sync
104 // End register, which has the bit
105 // that protects/unprotects CRTC
106 // index registers 0-7
107#define IND_CR2C 0x2C // Nordic LCD Interface Register
108#define IND_CR2D 0x2D // Nordic LCD Display Control
109#define IND_SET_RESET_ENABLE 0x01 // index of Set/Reset Enable reg in GC
110#define IND_DATA_ROTATE 0x03 // index of Data Rotate reg in GC
111#define IND_READ_MAP 0x04 // index of Read Map reg in Graph Ctlr
112#define IND_GRAPH_MODE 0x05 // index of Mode reg in Graph Ctlr
113#define IND_GRAPH_MISC 0x06 // index of Misc reg in Graph Ctlr
114#define IND_BIT_MASK 0x08 // index of Bit Mask reg in Graph Ctlr
115#define IND_SYNC_RESET 0x00 // index of Sync Reset reg in Seq
116#define IND_MAP_MASK 0x02 // index of Map Mask in Sequencer
117#define IND_MEMORY_MODE 0x04 // index of Memory Mode reg in Seq
118#define IND_CRTC_PROTECT 0x11 // index of reg containing regs 0-7 in
119 // CRTC
120#define IND_CRTC_COMPAT 0x34 // index of CRTC Compatibility reg
121 // in CRTC
122#define IND_PERF_TUNING 0x16 // index of performance tuning in Seq
123#define START_SYNC_RESET_VALUE 0x01 // value for Sync Reset reg to start
124 // synchronous reset
125#define END_SYNC_RESET_VALUE 0x03 // value for Sync Reset reg to end
126 // synchronous reset
127
128//
129// Values for Attribute Controller Index register to turn video off
130// and on, by setting bit 5 to 0 (off) or 1 (on).
131//
132
133#define VIDEO_DISABLE 0
134#define VIDEO_ENABLE 0x20
135
136#define INDEX_ENABLE_AUTO_START 0x31
137
138// Masks to keep only the significant bits of the Graphics Controller and
139// Sequencer Address registers. Masking is necessary because some VGAs, such
140// as S3-based ones, don't return unused bits set to 0, and some SVGAs use
141// these bits if extensions are enabled.
142//
143
144#define GRAPH_ADDR_MASK 0x0F
145#define SEQ_ADDR_MASK 0x07
146
147//
148// Mask used to toggle Chain4 bit in the Sequencer's Memory Mode register.
149//
150
151#define CHAIN4_MASK 0x08
152
153//
154// Value written to the Read Map register when identifying the existence of
155// a VGA in VgaInitialize. This value must be different from the final test
156// value written to the Bit Mask in that routine.
157//
158
159#define READ_MAP_TEST_SETTING 0x03
160
161//
162// Default text mode setting for various registers, used to restore their
163// states if VGA detection fails after they've been modified.
164//
165
166#define MEMORY_MODE_TEXT_DEFAULT 0x02
167#define BIT_MASK_DEFAULT 0xFF
168#define READ_MAP_DEFAULT 0x00
169
170
171//
172// Palette-related info.
173//
174
175//
176// Highest valid DAC color register index.
177//
178
179#define VIDEO_MAX_COLOR_REGISTER 0xFF
180
181//
182// Highest valid palette register index
183//
184
185#define VIDEO_MAX_PALETTE_REGISTER 0x0F
186
187//
188// Mode into which to put the VGA before starting a VDM, so it's a plain
189// vanilla VGA. (This is the mode's index in ModesVGA[], currently standard
190// 80x25 text mode.)
191//
192
193#define DEFAULT_MODE 0
194
195//
196// Number of bytes to save in each plane.
197//
198
199#define VGA_PLANE_SIZE 0x10000
200
201//
202// Number of each type of indexed register in a standard VGA, used by
203// validator and state save/restore functions.
204//
205// Note: VDMs currently only support basic VGAs only.
206//
207
208#define VGA_NUM_SEQUENCER_PORTS 5
209#define VGA_NUM_CRTC_PORTS 25
210#define VGA_NUM_GRAPH_CONT_PORTS 9
211#define VGA_NUM_ATTRIB_CONT_PORTS 21
212#define VGA_NUM_DAC_ENTRIES 256
213
214#define EXT_NUM_GRAPH_CONT_PORTS 0
215#define EXT_NUM_SEQUENCER_PORTS 0
216#define EXT_NUM_CRTC_PORTS 0
217#define EXT_NUM_ATTRIB_CONT_PORTS 0
218#define EXT_NUM_DAC_ENTRIES 0
219
220#endif /* _BOOTVID_VGA_H_ */