1 /*
2 * COPYRIGHT: GPL - See COPYING in the top level directory
3 * PROJECT: ReactOS Virtual DOS Machine
4 * FILE: subsystems/mvdm/ntvdm/hardware/video/svga.c
5 * PURPOSE: SuperVGA hardware emulation (Cirrus Logic CL-GD5434 compatible)
6 * PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
7 */
8
9 /* INCLUDES *******************************************************************/
10
11 #include "ntvdm.h"
12
13 #define NDEBUG
14 #include <debug.h>
15
16 #include "emulator.h"
17 #include "svga.h"
18 #include <bios/vidbios.h>
19
20 #include "memory.h"
21 #include "io.h"
22 #include "clock.h"
23
24 #include "../../console/video.h"
25
26 /* PRIVATE VARIABLES **********************************************************/
27
28 #define WRAP_OFFSET(x) ((VgaCrtcRegisters[SVGA_CRTC_EXT_DISPLAY_REG] & SVGA_CRTC_EXT_ADDR_WRAP) \
29 ? ((x) & 0xFFFFF) : LOWORD(x))
30
31 static CONST DWORD MemoryBase[] = { 0xA0000, 0xA0000, 0xB0000, 0xB8000 };
32 static CONST DWORD MemorySize[] = { 0x20000, 0x10000, 0x08000, 0x08000 };
33
34 #define USE_REACTOS_COLORS
35 // #define USE_DOSBOX_COLORS
36
37 #if defined(USE_REACTOS_COLORS)
38
39 // ReactOS colors
40 static CONST COLORREF VgaDefaultPalette[VGA_MAX_COLORS] =
41 {
42 RGB(0x00, 0x00, 0x00), RGB(0x00, 0x00, 0xAA), RGB(0x00, 0xAA, 0x00), RGB(0x00, 0xAA, 0xAA),
43 RGB(0xAA, 0x00, 0x00), RGB(0xAA, 0x00, 0xAA), RGB(0xAA, 0x55, 0x00), RGB(0xAA, 0xAA, 0xAA),
44 RGB(0x55, 0x55, 0x55), RGB(0x55, 0x55, 0xFF), RGB(0x55, 0xFF, 0x55), RGB(0x55, 0xFF, 0xFF),
45 RGB(0xFF, 0x55, 0x55), RGB(0xFF, 0x55, 0xFF), RGB(0xFF, 0xFF, 0x55), RGB(0xFF, 0xFF, 0xFF),
46 RGB(0x00, 0x00, 0x00), RGB(0x10, 0x10, 0x10), RGB(0x20, 0x20, 0x20), RGB(0x35, 0x35, 0x35),
47 RGB(0x45, 0x45, 0x45), RGB(0x55, 0x55, 0x55), RGB(0x65, 0x65, 0x65), RGB(0x75, 0x75, 0x75),
48 RGB(0x8A, 0x8A, 0x8A), RGB(0x9A, 0x9A, 0x9A), RGB(0xAA, 0xAA, 0xAA), RGB(0xBA, 0xBA, 0xBA),
49 RGB(0xCA, 0xCA, 0xCA), RGB(0xDF, 0xDF, 0xDF), RGB(0xEF, 0xEF, 0xEF), RGB(0xFF, 0xFF, 0xFF),
50 RGB(0x00, 0x00, 0xFF), RGB(0x41, 0x00, 0xFF), RGB(0x82, 0x00, 0xFF), RGB(0xBE, 0x00, 0xFF),
51 RGB(0xFF, 0x00, 0xFF), RGB(0xFF, 0x00, 0xBE), RGB(0xFF, 0x00, 0x82), RGB(0xFF, 0x00, 0x41),
52 RGB(0xFF, 0x00, 0x00), RGB(0xFF, 0x41, 0x00), RGB(0xFF, 0x82, 0x00), RGB(0xFF, 0xBE, 0x00),
53 RGB(0xFF, 0xFF, 0x00), RGB(0xBE, 0xFF, 0x00), RGB(0x82, 0xFF, 0x00), RGB(0x41, 0xFF, 0x00),
54 RGB(0x00, 0xFF, 0x00), RGB(0x00, 0xFF, 0x41), RGB(0x00, 0xFF, 0x82), RGB(0x00, 0xFF, 0xBE),
55 RGB(0x00, 0xFF, 0xFF), RGB(0x00, 0xBE, 0xFF), RGB(0x00, 0x82, 0xFF), RGB(0x00, 0x41, 0xFF),
56 RGB(0x82, 0x82, 0xFF), RGB(0x9E, 0x82, 0xFF), RGB(0xBE, 0x82, 0xFF), RGB(0xDF, 0x82, 0xFF),
57 RGB(0xFF, 0x82, 0xFF), RGB(0xFF, 0x82, 0xDF), RGB(0xFF, 0x82, 0xBE), RGB(0xFF, 0x82, 0x9E),
58 RGB(0xFF, 0x82, 0x82), RGB(0xFF, 0x9E, 0x82), RGB(0xFF, 0xBE, 0x82), RGB(0xFF, 0xDF, 0x82),
59 RGB(0xFF, 0xFF, 0x82), RGB(0xDF, 0xFF, 0x82), RGB(0xBE, 0xFF, 0x82), RGB(0x9E, 0xFF, 0x82),
60 RGB(0x82, 0xFF, 0x82), RGB(0x82, 0xFF, 0x9E), RGB(0x82, 0xFF, 0xBE), RGB(0x82, 0xFF, 0xDF),
61 RGB(0x82, 0xFF, 0xFF), RGB(0x82, 0xDF, 0xFF), RGB(0x82, 0xBE, 0xFF), RGB(0x82, 0x9E, 0xFF),
62 RGB(0xBA, 0xBA, 0xFF), RGB(0xCA, 0xBA, 0xFF), RGB(0xDF, 0xBA, 0xFF), RGB(0xEF, 0xBA, 0xFF),
63 RGB(0xFF, 0xBA, 0xFF), RGB(0xFF, 0xBA, 0xEF), RGB(0xFF, 0xBA, 0xDF), RGB(0xFF, 0xBA, 0xCA),
64 RGB(0xFF, 0xBA, 0xBA), RGB(0xFF, 0xCA, 0xBA), RGB(0xFF, 0xDF, 0xBA), RGB(0xFF, 0xEF, 0xBA),
65 RGB(0xFF, 0xFF, 0xBA), RGB(0xEF, 0xFF, 0xBA), RGB(0xDF, 0xFF, 0xBA), RGB(0xCA, 0xFF, 0xBA),
66 RGB(0xBA, 0xFF, 0xBA), RGB(0xBA, 0xFF, 0xCA), RGB(0xBA, 0xFF, 0xDF), RGB(0xBA, 0xFF, 0xEF),
67 RGB(0xBA, 0xFF, 0xFF), RGB(0xBA, 0xEF, 0xFF), RGB(0xBA, 0xDF, 0xFF), RGB(0xBA, 0xCA, 0xFF),
68 RGB(0x00, 0x00, 0x71), RGB(0x1C, 0x00, 0x71), RGB(0x39, 0x00, 0x71), RGB(0x55, 0x00, 0x71),
69 RGB(0x71, 0x00, 0x71), RGB(0x71, 0x00, 0x55), RGB(0x71, 0x00, 0x39), RGB(0x71, 0x00, 0x1C),
70 RGB(0x71, 0x00, 0x00), RGB(0x71, 0x1C, 0x00), RGB(0x71, 0x39, 0x00), RGB(0x71, 0x55, 0x00),
71 RGB(0x71, 0x71, 0x00), RGB(0x55, 0x71, 0x00), RGB(0x39, 0x71, 0x00), RGB(0x1C, 0x71, 0x00),
72 RGB(0x00, 0x71, 0x00), RGB(0x00, 0x71, 0x1C), RGB(0x00, 0x71, 0x39), RGB(0x00, 0x71, 0x55),
73 RGB(0x00, 0x71, 0x71), RGB(0x00, 0x55, 0x71), RGB(0x00, 0x39, 0x71), RGB(0x00, 0x1C, 0x71),
74 RGB(0x39, 0x39, 0x71), RGB(0x45, 0x39, 0x71), RGB(0x55, 0x39, 0x71), RGB(0x61, 0x39, 0x71),
75 RGB(0x71, 0x39, 0x71), RGB(0x71, 0x39, 0x61), RGB(0x71, 0x39, 0x55), RGB(0x71, 0x39, 0x45),
76 RGB(0x71, 0x39, 0x39), RGB(0x71, 0x45, 0x39), RGB(0x71, 0x55, 0x39), RGB(0x71, 0x61, 0x39),
77 RGB(0x71, 0x71, 0x39), RGB(0x61, 0x71, 0x39), RGB(0x55, 0x71, 0x39), RGB(0x45, 0x71, 0x39),
78 RGB(0x39, 0x71, 0x39), RGB(0x39, 0x71, 0x45), RGB(0x39, 0x71, 0x55), RGB(0x39, 0x71, 0x61),
79 RGB(0x39, 0x71, 0x71), RGB(0x39, 0x61, 0x71), RGB(0x39, 0x55, 0x71), RGB(0x39, 0x45, 0x71),
80 RGB(0x51, 0x51, 0x71), RGB(0x59, 0x51, 0x71), RGB(0x61, 0x51, 0x71), RGB(0x69, 0x51, 0x71),
81 RGB(0x71, 0x51, 0x71), RGB(0x71, 0x51, 0x69), RGB(0x71, 0x51, 0x61), RGB(0x71, 0x51, 0x59),
82 RGB(0x71, 0x51, 0x51), RGB(0x71, 0x59, 0x51), RGB(0x71, 0x61, 0x51), RGB(0x71, 0x69, 0x51),
83 RGB(0x71, 0x71, 0x51), RGB(0x69, 0x71, 0x51), RGB(0x61, 0x71, 0x51), RGB(0x59, 0x71, 0x51),
84 RGB(0x51, 0x71, 0x51), RGB(0x51, 0x71, 0x59), RGB(0x51, 0x71, 0x61), RGB(0x51, 0x71, 0x69),
85 RGB(0x51, 0x71, 0x71), RGB(0x51, 0x69, 0x71), RGB(0x51, 0x61, 0x71), RGB(0x51, 0x59, 0x71),
86 RGB(0x00, 0x00, 0x41), RGB(0x10, 0x00, 0x41), RGB(0x20, 0x00, 0x41), RGB(0x31, 0x00, 0x41),
87 RGB(0x41, 0x00, 0x41), RGB(0x41, 0x00, 0x31), RGB(0x41, 0x00, 0x20), RGB(0x41, 0x00, 0x10),
88 RGB(0x41, 0x00, 0x00), RGB(0x41, 0x10, 0x00), RGB(0x41, 0x20, 0x00), RGB(0x41, 0x31, 0x00),
89 RGB(0x41, 0x41, 0x00), RGB(0x31, 0x41, 0x00), RGB(0x20, 0x41, 0x00), RGB(0x10, 0x41, 0x00),
90 RGB(0x00, 0x41, 0x00), RGB(0x00, 0x41, 0x10), RGB(0x00, 0x41, 0x20), RGB(0x00, 0x41, 0x31),
91 RGB(0x00, 0x41, 0x41), RGB(0x00, 0x31, 0x41), RGB(0x00, 0x20, 0x41), RGB(0x00, 0x10, 0x41),
92 RGB(0x20, 0x20, 0x41), RGB(0x28, 0x20, 0x41), RGB(0x31, 0x20, 0x41), RGB(0x39, 0x20, 0x41),
93 RGB(0x41, 0x20, 0x41), RGB(0x41, 0x20, 0x39), RGB(0x41, 0x20, 0x31), RGB(0x41, 0x20, 0x28),
94 RGB(0x41, 0x20, 0x20), RGB(0x41, 0x28, 0x20), RGB(0x41, 0x31, 0x20), RGB(0x41, 0x39, 0x20),
95 RGB(0x41, 0x41, 0x20), RGB(0x39, 0x41, 0x20), RGB(0x31, 0x41, 0x20), RGB(0x28, 0x41, 0x20),
96 RGB(0x20, 0x41, 0x20), RGB(0x20, 0x41, 0x28), RGB(0x20, 0x41, 0x31), RGB(0x20, 0x41, 0x39),
97 RGB(0x20, 0x41, 0x41), RGB(0x20, 0x39, 0x41), RGB(0x20, 0x31, 0x41), RGB(0x20, 0x28, 0x41),
98 RGB(0x2D, 0x2D, 0x41), RGB(0x31, 0x2D, 0x41), RGB(0x35, 0x2D, 0x41), RGB(0x3D, 0x2D, 0x41),
99 RGB(0x41, 0x2D, 0x41), RGB(0x41, 0x2D, 0x3D), RGB(0x41, 0x2D, 0x35), RGB(0x41, 0x2D, 0x31),
100 RGB(0x41, 0x2D, 0x2D), RGB(0x41, 0x31, 0x2D), RGB(0x41, 0x35, 0x2D), RGB(0x41, 0x3D, 0x2D),
101 RGB(0x41, 0x41, 0x2D), RGB(0x3D, 0x41, 0x2D), RGB(0x35, 0x41, 0x2D), RGB(0x31, 0x41, 0x2D),
102 RGB(0x2D, 0x41, 0x2D), RGB(0x2D, 0x41, 0x31), RGB(0x2D, 0x41, 0x35), RGB(0x2D, 0x41, 0x3D),
103 RGB(0x2D, 0x41, 0x41), RGB(0x2D, 0x3D, 0x41), RGB(0x2D, 0x35, 0x41), RGB(0x2D, 0x31, 0x41),
104 RGB(0x00, 0x00, 0x00), RGB(0x00, 0x00, 0x00), RGB(0x00, 0x00, 0x00), RGB(0x00, 0x00, 0x00),
105 RGB(0x00, 0x00, 0x00), RGB(0x00, 0x00, 0x00), RGB(0x00, 0x00, 0x00), RGB(0x00, 0x00, 0x00)
106 };
107
108 #elif defined(USE_DOSBOX_COLORS)
109
110 // DOSBox colors
111 static CONST COLORREF VgaDefaultPalette[VGA_MAX_COLORS] =
112 {
113 RGB(0x00, 0x00, 0x00), RGB(0x00, 0x00, 0xAA), RGB(0x00, 0xAA, 0x00), RGB(0x00, 0xAA, 0xAA),
114 RGB(0xAA, 0x00, 0x00), RGB(0xAA, 0x00, 0xAA), RGB(0xAA, 0x55, 0x00), RGB(0xAA, 0xAA, 0xAA),
115 RGB(0x55, 0x55, 0x55), RGB(0x55, 0x55, 0xFF), RGB(0x55, 0xFF, 0x55), RGB(0x55, 0xFF, 0xFF),
116 RGB(0xFF, 0x55, 0x55), RGB(0xFF, 0x55, 0xFF), RGB(0xFF, 0xFF, 0x55), RGB(0xFF, 0xFF, 0xFF),
117 RGB(0x00, 0x00, 0x00), RGB(0x14, 0x14, 0x14), RGB(0x20, 0x20, 0x20), RGB(0x2C, 0x2C, 0x2C),
118 RGB(0x38, 0x38, 0x38), RGB(0x45, 0x45, 0x45), RGB(0x51, 0x51, 0x51), RGB(0x61, 0x61, 0x61),
119 RGB(0x71, 0x71, 0x71), RGB(0x82, 0x82, 0x82), RGB(0x92, 0x92, 0x92), RGB(0xA2, 0xA2, 0xA2),
120 RGB(0xB6, 0xB6, 0xB6), RGB(0xCB, 0xCB, 0xCB), RGB(0xE3, 0xE3, 0xE3), RGB(0xFF, 0xFF, 0xFF),
121 RGB(0x00, 0x00, 0xFF), RGB(0x41, 0x00, 0xFF), RGB(0x7D, 0x00, 0xFF), RGB(0xBE, 0x00, 0xFF),
122 RGB(0xFF, 0x00, 0xFF), RGB(0xFF, 0x00, 0xBE), RGB(0xFF, 0x00, 0x7D), RGB(0xFF, 0x00, 0x41),
123 RGB(0xFF, 0x00, 0x00), RGB(0xFF, 0x41, 0x00), RGB(0xFF, 0x7D, 0x00), RGB(0xFF, 0xBE, 0x00),
124 RGB(0xFF, 0xFF, 0x00), RGB(0xBE, 0xFF, 0x00), RGB(0x7D, 0xFF, 0x00), RGB(0x41, 0xFF, 0x00),
125 RGB(0x00, 0xFF, 0x00), RGB(0x00, 0xFF, 0x41), RGB(0x00, 0xFF, 0x7D), RGB(0x00, 0xFF, 0xBE),
126 RGB(0x00, 0xFF, 0xFF), RGB(0x00, 0xBE, 0xFF), RGB(0x00, 0x7D, 0xFF), RGB(0x00, 0x41, 0xFF),
127 RGB(0x7D, 0x7D, 0xFF), RGB(0x9E, 0x7D, 0xFF), RGB(0xBE, 0x7D, 0xFF), RGB(0xDF, 0x7D, 0xFF),
128 RGB(0xFF, 0x7D, 0xFF), RGB(0xFF, 0x7D, 0xDF), RGB(0xFF, 0x7D, 0xBE), RGB(0xFF, 0x7D, 0x9E),
129
130 RGB(0xFF, 0x7D, 0x7D), RGB(0xFF, 0x9E, 0x7D), RGB(0xFF, 0xBE, 0x7D), RGB(0xFF, 0xDF, 0x7D),
131 RGB(0xFF, 0xFF, 0x7D), RGB(0xDF, 0xFF, 0x7D), RGB(0xBE, 0xFF, 0x7D), RGB(0x9E, 0xFF, 0x7D),
132 RGB(0x7D, 0xFF, 0x7D), RGB(0x7D, 0xFF, 0x9E), RGB(0x7D, 0xFF, 0xBE), RGB(0x7D, 0xFF, 0xDF),
133 RGB(0x7D, 0xFF, 0xFF), RGB(0x7D, 0xDF, 0xFF), RGB(0x7D, 0xBE, 0xFF), RGB(0x7D, 0x9E, 0xFF),
134 RGB(0xB6, 0xB6, 0xFF), RGB(0xC7, 0xB6, 0xFF), RGB(0xDB, 0xB6, 0xFF), RGB(0xEB, 0xB6, 0xFF),
135 RGB(0xFF, 0xB6, 0xFF), RGB(0xFF, 0xB6, 0xEB), RGB(0xFF, 0xB6, 0xDB), RGB(0xFF, 0xB6, 0xC7),
136 RGB(0xFF, 0xB6, 0xB6), RGB(0xFF, 0xC7, 0xB6), RGB(0xFF, 0xDB, 0xB6), RGB(0xFF, 0xEB, 0xB6),
137 RGB(0xFF, 0xFF, 0xB6), RGB(0xEB, 0xFF, 0xB6), RGB(0xDB, 0xFF, 0xB6), RGB(0xC7, 0xFF, 0xB6),
138 RGB(0xB6, 0xFF, 0xB6), RGB(0xB6, 0xFF, 0xC7), RGB(0xB6, 0xFF, 0xDB), RGB(0xB6, 0xFF, 0xEB),
139 RGB(0xB6, 0xFF, 0xFF), RGB(0xB6, 0xEB, 0xFF), RGB(0xB6, 0xDB, 0xFF), RGB(0xB6, 0xC7, 0xFF),
140 RGB(0x00, 0x00, 0x71), RGB(0x1C, 0x00, 0x71), RGB(0x38, 0x00, 0x71), RGB(0x55, 0x00, 0x71),
141 RGB(0x71, 0x00, 0x71), RGB(0x71, 0x00, 0x55), RGB(0x71, 0x00, 0x38), RGB(0x71, 0x00, 0x1C),
142 RGB(0x71, 0x00, 0x00), RGB(0x71, 0x1C, 0x00), RGB(0x71, 0x38, 0x00), RGB(0x71, 0x55, 0x00),
143 RGB(0x71, 0x71, 0x00), RGB(0x55, 0x71, 0x00), RGB(0x38, 0x71, 0x00), RGB(0x1C, 0x71, 0x00),
144 RGB(0x00, 0x71, 0x00), RGB(0x00, 0x71, 0x1C), RGB(0x00, 0x71, 0x38), RGB(0x00, 0x71, 0x55),
145 RGB(0x00, 0x71, 0x71), RGB(0x00, 0x55, 0x71), RGB(0x00, 0x38, 0x71), RGB(0x00, 0x1C, 0x71),
146
147 RGB(0x38, 0x38, 0x71), RGB(0x45, 0x38, 0x71), RGB(0x55, 0x38, 0x71), RGB(0x61, 0x38, 0x71),
148 RGB(0x71, 0x38, 0x71), RGB(0x71, 0x38, 0x61), RGB(0x71, 0x38, 0x55), RGB(0x71, 0x38, 0x45),
149 RGB(0x71, 0x38, 0x38), RGB(0x71, 0x45, 0x38), RGB(0x71, 0x55, 0x38), RGB(0x71, 0x61, 0x38),
150 RGB(0x71, 0x71, 0x38), RGB(0x61, 0x71, 0x38), RGB(0x55, 0x71, 0x38), RGB(0x45, 0x71, 0x38),
151 RGB(0x38, 0x71, 0x38), RGB(0x38, 0x71, 0x45), RGB(0x38, 0x71, 0x55), RGB(0x38, 0x71, 0x61),
152 RGB(0x38, 0x71, 0x71), RGB(0x38, 0x61, 0x71), RGB(0x38, 0x55, 0x71), RGB(0x38, 0x45, 0x71),
153 RGB(0x51, 0x51, 0x71), RGB(0x59, 0x51, 0x71), RGB(0x61, 0x51, 0x71), RGB(0x69, 0x51, 0x71),
154 RGB(0x71, 0x51, 0x71), RGB(0x71, 0x51, 0x69), RGB(0x71, 0x51, 0x61), RGB(0x71, 0x51, 0x59),
155 RGB(0x71, 0x51, 0x51), RGB(0x71, 0x59, 0x51), RGB(0x71, 0x61, 0x51), RGB(0x71, 0x69, 0x51),
156 RGB(0x71, 0x71, 0x51), RGB(0x69, 0x71, 0x51), RGB(0x61, 0x71, 0x51), RGB(0x59, 0x71, 0x51),
157 RGB(0x51, 0x71, 0x51), RGB(0x51, 0x71, 0x59), RGB(0x51, 0x71, 0x61), RGB(0x51, 0x71, 0x69),
158 RGB(0x51, 0x71, 0x71), RGB(0x51, 0x69, 0x71), RGB(0x51, 0x61, 0x71), RGB(0x51, 0x59, 0x71),
159 RGB(0x00, 0x00, 0x41), RGB(0x10, 0x00, 0x41), RGB(0x20, 0x00, 0x41), RGB(0x30, 0x00, 0x41),
160 RGB(0x41, 0x00, 0x41), RGB(0x41, 0x00, 0x30), RGB(0x41, 0x00, 0x20), RGB(0x41, 0x00, 0x10),
161 RGB(0x41, 0x00, 0x00), RGB(0x41, 0x10, 0x00), RGB(0x41, 0x20, 0x00), RGB(0x41, 0x30, 0x00),
162 RGB(0x41, 0x41, 0x00), RGB(0x30, 0x41, 0x00), RGB(0x20, 0x41, 0x00), RGB(0x10, 0x41, 0x00),
163
164 RGB(0x00, 0x41, 0x00), RGB(0x00, 0x41, 0x10), RGB(0x00, 0x41, 0x20), RGB(0x00, 0x41, 0x30),
165 RGB(0x00, 0x41, 0x41), RGB(0x00, 0x30, 0x41), RGB(0x00, 0x20, 0x41), RGB(0x00, 0x10, 0x41),
166 RGB(0x20, 0x20, 0x41), RGB(0x28, 0x20, 0x41), RGB(0x30, 0x20, 0x41), RGB(0x38, 0x20, 0x41),
167 RGB(0x41, 0x20, 0x41), RGB(0x41, 0x20, 0x38), RGB(0x41, 0x20, 0x30), RGB(0x41, 0x20, 0x28),
168 RGB(0x41, 0x20, 0x20), RGB(0x41, 0x28, 0x20), RGB(0x41, 0x30, 0x20), RGB(0x41, 0x38, 0x20),
169 RGB(0x41, 0x41, 0x20), RGB(0x38, 0x41, 0x20), RGB(0x30, 0x41, 0x20), RGB(0x28, 0x41, 0x20),
170 RGB(0x20, 0x41, 0x20), RGB(0x20, 0x41, 0x28), RGB(0x20, 0x41, 0x30), RGB(0x20, 0x41, 0x38),
171 RGB(0x20, 0x41, 0x41), RGB(0x20, 0x38, 0x41), RGB(0x20, 0x30, 0x41), RGB(0x20, 0x28, 0x41),
172 RGB(0x2C, 0x2C, 0x41), RGB(0x30, 0x2C, 0x41), RGB(0x34, 0x2C, 0x41), RGB(0x3C, 0x2C, 0x41),
173 RGB(0x41, 0x2C, 0x41), RGB(0x41, 0x2C, 0x3C), RGB(0x41, 0x2C, 0x34), RGB(0x41, 0x2C, 0x30),
174 RGB(0x41, 0x2C, 0x2C), RGB(0x41, 0x30, 0x2C), RGB(0x41, 0x34, 0x2C), RGB(0x41, 0x3C, 0x2C),
175 RGB(0x41, 0x41, 0x2C), RGB(0x3C, 0x41, 0x2C), RGB(0x34, 0x41, 0x2C), RGB(0x30, 0x41, 0x2C),
176 RGB(0x2C, 0x41, 0x2C), RGB(0x2C, 0x41, 0x30), RGB(0x2C, 0x41, 0x34), RGB(0x2C, 0x41, 0x3C),
177 RGB(0x2C, 0x41, 0x41), RGB(0x2C, 0x3C, 0x41), RGB(0x2C, 0x34, 0x41), RGB(0x2C, 0x30, 0x41),
178 RGB(0x00, 0x00, 0x00), RGB(0x00, 0x00, 0x00), RGB(0x00, 0x00, 0x00), RGB(0x00, 0x00, 0x00),
179 RGB(0x00, 0x00, 0x00), RGB(0x00, 0x00, 0x00), RGB(0x00, 0x00, 0x00), RGB(0x00, 0x00, 0x00)
180 };
181
182 #endif
183
184 /*
185 * Default 16-color palette for foreground and background
186 * (corresponding flags in comments).
187 * Taken from subsystems/win32/winsrv/consrv/frontends/gui/conwnd.c
188 */
189 static const COLORREF ConsoleColors[16] =
190 {
191 RGB(0, 0, 0), // (Black)
192 RGB(0, 0, 128), // BLUE
193 RGB(0, 128, 0), // GREEN
194 RGB(0, 128, 128), // BLUE | GREEN
195 RGB(128, 0, 0), // RED
196 RGB(128, 0, 128), // BLUE | RED
197 RGB(128, 128, 0), // GREEN | RED
198 RGB(192, 192, 192), // BLUE | GREEN | RED
199
200 RGB(128, 128, 128), // (Grey) INTENSITY
201 RGB(0, 0, 255), // BLUE | INTENSITY
202 RGB(0, 255, 0), // GREEN | INTENSITY
203 RGB(0, 255, 255), // BLUE | GREEN | INTENSITY
204 RGB(255, 0, 0), // RED | INTENSITY
205 RGB(255, 0, 255), // BLUE | RED | INTENSITY
206 RGB(255, 255, 0), // GREEN | RED | INTENSITY
207 RGB(255, 255, 255) // BLUE | GREEN | RED | INTENSITY
208 };
209
210 /// ConsoleFramebuffer
211 static PVOID ActiveFramebuffer = NULL; // Active framebuffer, points to
212 // either TextFramebuffer or a
213 // valid graphics framebuffer.
214 static HPALETTE TextPaletteHandle = NULL;
215 static HPALETTE PaletteHandle = NULL;
216
217 /*
218 * Text mode -- we always keep a valid text mode framebuffer
219 * even if we are in graphics mode. This is needed in order
220 * to keep a consistent VGA state. However, each time the VGA
221 * detaches from the console (and reattaches to it later on),
222 * this text mode framebuffer is recreated.
223 */
224 static PCHAR_CELL TextFramebuffer = NULL;
225
226 /*
227 * Graphics mode
228 */
229 static PBYTE GraphicsFramebuffer = NULL;
230
231
232 // static HANDLE ConsoleMutex = NULL;
233 // /* DoubleVision support */
234 // static BOOLEAN DoubleWidth = FALSE;
235 // static BOOLEAN DoubleHeight = FALSE;
236
237
238
239
240
241 /*
242 * VGA Hardware
243 */
244 static BYTE VgaMemory[VGA_NUM_BANKS * SVGA_BANK_SIZE];
245
246 static BYTE VgaLatchRegisters[VGA_NUM_BANKS] = {0, 0, 0, 0};
247
248 static BYTE VgaMiscRegister;
249 static BYTE VgaFeatureRegister;
250
251 static BYTE VgaSeqIndex = VGA_SEQ_RESET_REG;
252 static BYTE VgaSeqRegisters[SVGA_SEQ_MAX_REG];
253
254 static BYTE VgaCrtcIndex = VGA_CRTC_HORZ_TOTAL_REG;
255 static BYTE VgaCrtcRegisters[SVGA_CRTC_MAX_REG];
256
257 static BYTE VgaGcIndex = VGA_GC_RESET_REG;
258 static BYTE VgaGcRegisters[SVGA_GC_MAX_REG];
259
260 static BOOLEAN VgaAcLatch = FALSE;
261 static BOOLEAN VgaAcPalDisable = TRUE;
262 static BYTE VgaAcIndex = VGA_AC_PAL_0_REG;
263 static BYTE VgaAcRegisters[VGA_AC_MAX_REG];
264
265 static BYTE VgaDacMask = 0xFF;
266 static BYTE VgaDacLatchCounter = 0;
267 static BYTE VgaDacLatch[3];
268
269 static BOOLEAN VgaDacReadWrite = FALSE;
270 static WORD VgaDacIndex = 0;
271 static BYTE VgaDacRegisters[VGA_PALETTE_SIZE];
272
273 // static VGA_REGISTERS VgaRegisters;
274
275 static ULONGLONG HorizontalRetraceCycle = 0ULL;
276 static PHARDWARE_TIMER HSyncTimer;
277 static DWORD ScanlineCounter = 0;
278 static DWORD StartAddressLatch = 0;
279 static DWORD ScanlineSizeLatch = 0;
280
281 static BOOLEAN NeedsUpdate = FALSE;
282 static BOOLEAN ModeChanged = FALSE;
283 static BOOLEAN CursorChanged = FALSE;
284 static BOOLEAN PaletteChanged = FALSE;
285
286 static UINT SvgaHdrCounter = 0;
287 static BYTE SvgaHiddenRegister = 0;
288
289 typedef enum _SCREEN_MODE
290 {
291 TEXT_MODE,
292 GRAPHICS_MODE
293 } SCREEN_MODE, *PSCREEN_MODE;
294
295 static SCREEN_MODE ScreenMode = TEXT_MODE;
296 static COORD CurrResolution = {0};
297
298 static SMALL_RECT UpdateRectangle = { 0, 0, 0, 0 };
299
300
301
302
303 /** HACK!! **/
304 #include "../../console/video.c"
305 /** HACK!! **/
306
307
308
309
310
311 /* PRIVATE FUNCTIONS **********************************************************/
312
VgaGetVideoBaseAddress(VOID)313 static inline DWORD VgaGetVideoBaseAddress(VOID)
314 {
315 return MemoryBase[(VgaGcRegisters[VGA_GC_MISC_REG] >> 2) & 0x03];
316 }
317
VgaGetAddressSize(VOID)318 static inline DWORD VgaGetAddressSize(VOID)
319 {
320 if (VgaSeqRegisters[SVGA_SEQ_EXT_MODE_REG] & SVGA_SEQ_EXT_MODE_HIGH_RES)
321 {
322 /* Packed pixel addressing */
323 return 1;
324 }
325 else if (VgaCrtcRegisters[VGA_CRTC_UNDERLINE_REG] & VGA_CRTC_UNDERLINE_DWORD)
326 {
327 /* Double-word addressing */
328 return 4; // sizeof(DWORD)
329 }
330 else if (VgaCrtcRegisters[VGA_CRTC_MODE_CONTROL_REG] & VGA_CRTC_MODE_CONTROL_BYTE)
331 {
332 /* Byte addressing */
333 return 1; // sizeof(BYTE)
334 }
335 else
336 {
337 /* Word addressing */
338 return 2; // sizeof(WORD)
339 }
340 }
341
VgaTranslateAddress(DWORD Address)342 static inline DWORD VgaTranslateAddress(DWORD Address)
343 {
344 DWORD Offset = LOWORD(Address - VgaGetVideoBaseAddress());
345 DWORD ExtOffset = ((VgaGcRegisters[SVGA_GC_EXT_MODE_REG] & SVGA_GC_EXT_MODE_WND_B) && (Offset & (1 << 15)))
346 ? VgaGcRegisters[SVGA_GC_OFFSET_1_REG]
347 : VgaGcRegisters[SVGA_GC_OFFSET_0_REG];
348
349 /* Check for chain-4 and odd-even mode */
350 if (VgaSeqRegisters[VGA_SEQ_MEM_REG] & VGA_SEQ_MEM_C4)
351 {
352 /* Clear the lowest two bits since they're used to select the bank */
353 Offset &= ~3;
354 }
355 else if (VgaGcRegisters[VGA_GC_MODE_REG] & VGA_GC_MODE_OE)
356 {
357 /* Clear the lowest bit since it's used to select odd/even */
358 Offset &= ~1;
359 }
360
361 if (ExtOffset)
362 {
363 /* Add the extended offset */
364 Offset += ExtOffset << ((VgaGcRegisters[SVGA_GC_EXT_MODE_REG] & SVGA_GC_EXT_MODE_GRAN) ? 14 : 12);
365 }
366
367 /* Return the offset on plane 0 */
368 return Offset;
369 }
370
VgaTranslateByteForWriting(BYTE Data,BYTE Plane)371 static inline BYTE VgaTranslateByteForWriting(BYTE Data, BYTE Plane)
372 {
373 BYTE WriteMode = VgaGcRegisters[VGA_GC_MODE_REG] & 0x03;
374 BYTE BitMask = VgaGcRegisters[VGA_GC_BITMASK_REG];
375
376 if (WriteMode == 1)
377 {
378 /* In write mode 1 just return the latch register */
379 return VgaLatchRegisters[Plane];
380 }
381
382 if (WriteMode != 2)
383 {
384 /* Write modes 0 and 3 rotate the data to the right first */
385 BYTE RotateCount = VgaGcRegisters[VGA_GC_ROTATE_REG] & 0x07;
386 Data = LOBYTE(((DWORD)Data >> RotateCount) | ((DWORD)Data << (8 - RotateCount)));
387 }
388 else
389 {
390 /* Write mode 2 expands the appropriate bit to all 8 bits */
391 Data = (Data & (1 << Plane)) ? 0xFF : 0x00;
392 }
393
394 if (WriteMode == 0)
395 {
396 /*
397 * In write mode 0, the enable set/reset register decides if the
398 * set/reset bit should be expanded to all 8 bits.
399 */
400 if (VgaGcRegisters[VGA_GC_ENABLE_RESET_REG] & (1 << Plane))
401 {
402 /* Copy the bit from the set/reset register to all 8 bits */
403 Data = (VgaGcRegisters[VGA_GC_RESET_REG] & (1 << Plane)) ? 0xFF : 0x00;
404 }
405 }
406
407 if (WriteMode != 3)
408 {
409 /* Write modes 0 and 2 then perform a logical operation on the data and latch */
410 BYTE LogicalOperation = (VgaGcRegisters[VGA_GC_ROTATE_REG] >> 3) & 0x03;
411
412 if (LogicalOperation == 1) Data &= VgaLatchRegisters[Plane];
413 else if (LogicalOperation == 2) Data |= VgaLatchRegisters[Plane];
414 else if (LogicalOperation == 3) Data ^= VgaLatchRegisters[Plane];
415 }
416 else
417 {
418 /* For write mode 3, we AND the bitmask with the data, which is used as the new bitmask */
419 BitMask &= Data;
420
421 /* Then we expand the bit in the set/reset field */
422 Data = (VgaGcRegisters[VGA_GC_RESET_REG] & (1 << Plane)) ? 0xFF : 0x00;
423 }
424
425 /* Bits cleared in the bitmask are replaced with latch register bits */
426 Data = (Data & BitMask) | (VgaLatchRegisters[Plane] & (~BitMask));
427
428 /* Return the byte */
429 return Data;
430 }
431
VgaGetClockFrequency(VOID)432 static inline ULONG VgaGetClockFrequency(VOID)
433 {
434 BYTE Numerator, Denominator;
435
436 if (VgaSeqRegisters[SVGA_SEQ_MCLK_REG] & SVGA_SEQ_MCLK_VCLK)
437 {
438 /* The VCLK is being generated using the MCLK */
439 ULONG Clock = (VGA_CLOCK_BASE * (VgaSeqRegisters[SVGA_SEQ_MCLK_REG] & 0x3F)) >> 3;
440
441 if (VgaSeqRegisters[SVGA_SEQ_VCLK3_DENOMINATOR_REG] & 1)
442 {
443 /* Use only half of the MCLK as the VCLK */
444 Clock >>= 1;
445 }
446
447 return Clock;
448 }
449
450 switch ((VgaMiscRegister >> 2) & 3)
451 {
452 case 0:
453 {
454 Numerator = VgaSeqRegisters[SVGA_SEQ_VCLK0_NUMERATOR_REG];
455 Denominator = VgaSeqRegisters[SVGA_SEQ_VCLK0_DENOMINATOR_REG];
456 break;
457 }
458
459 case 1:
460 {
461 Numerator = VgaSeqRegisters[SVGA_SEQ_VCLK1_NUMERATOR_REG];
462 Denominator = VgaSeqRegisters[SVGA_SEQ_VCLK1_DENOMINATOR_REG];
463 break;
464 }
465
466 case 2:
467 {
468 Numerator = VgaSeqRegisters[SVGA_SEQ_VCLK2_NUMERATOR_REG];
469 Denominator = VgaSeqRegisters[SVGA_SEQ_VCLK2_DENOMINATOR_REG];
470 break;
471 }
472
473 case 3:
474 {
475 Numerator = VgaSeqRegisters[SVGA_SEQ_VCLK3_NUMERATOR_REG];
476 Denominator = VgaSeqRegisters[SVGA_SEQ_VCLK3_DENOMINATOR_REG];
477 break;
478 }
479 }
480
481 /* The numerator is 7-bit */
482 Numerator &= ~(1 << 7);
483
484 /* If bit 7 is clear, the denominator is 5-bit */
485 if (!(Denominator & (1 << 7))) Denominator &= ~(1 << 6);
486
487 /* Bit 0 of the denominator is the post-scalar bit */
488 if (Denominator & 1) Denominator &= ~1;
489 else Denominator >>= 1;
490
491 /* Return the clock frequency in Hz */
492 return (VGA_CLOCK_BASE * Numerator) / Denominator;
493 }
494
VgaResetSequencer(VOID)495 static VOID VgaResetSequencer(VOID)
496 {
497 /* Lock extended SVGA registers */
498 VgaSeqRegisters[SVGA_SEQ_UNLOCK_REG] = SVGA_SEQ_LOCKED;
499
500 /* Initialize the VCLKs */
501 VgaSeqRegisters[SVGA_SEQ_VCLK0_NUMERATOR_REG] = 0x66;
502 VgaSeqRegisters[SVGA_SEQ_VCLK0_DENOMINATOR_REG] = 0x3B;
503 VgaSeqRegisters[SVGA_SEQ_VCLK1_NUMERATOR_REG] = 0x5B;
504 VgaSeqRegisters[SVGA_SEQ_VCLK1_DENOMINATOR_REG] = 0x2F;
505 VgaSeqRegisters[SVGA_SEQ_VCLK2_NUMERATOR_REG] = 0x45;
506 VgaSeqRegisters[SVGA_SEQ_VCLK2_DENOMINATOR_REG] = 0x30;
507 VgaSeqRegisters[SVGA_SEQ_VCLK3_NUMERATOR_REG] = 0x7E;
508 VgaSeqRegisters[SVGA_SEQ_VCLK3_DENOMINATOR_REG] = 0x33;
509
510 /* 50 MHz MCLK, not being used as the VCLK */
511 VgaSeqRegisters[SVGA_SEQ_MCLK_REG] = 0x1C;
512 }
513
VgaRestoreDefaultPalette(PPALETTEENTRY Entries,USHORT NumOfEntries)514 static VOID VgaRestoreDefaultPalette(PPALETTEENTRY Entries, USHORT NumOfEntries)
515 {
516 USHORT i;
517
518 /* Copy the colors of the default palette to the DAC and console palette */
519 for (i = 0; i < NumOfEntries; i++)
520 {
521 /* Set the palette entries */
522 Entries[i].peRed = GetRValue(VgaDefaultPalette[i]);
523 Entries[i].peGreen = GetGValue(VgaDefaultPalette[i]);
524 Entries[i].peBlue = GetBValue(VgaDefaultPalette[i]);
525 Entries[i].peFlags = 0;
526
527 /* Set the DAC registers */
528 VgaDacRegisters[i * 3] = VGA_COLOR_TO_DAC(GetRValue(VgaDefaultPalette[i]));
529 VgaDacRegisters[i * 3 + 1] = VGA_COLOR_TO_DAC(GetGValue(VgaDefaultPalette[i]));
530 VgaDacRegisters[i * 3 + 2] = VGA_COLOR_TO_DAC(GetBValue(VgaDefaultPalette[i]));
531 }
532 }
533
VgaInitializePalette(VOID)534 static BOOLEAN VgaInitializePalette(VOID)
535 {
536 UINT i;
537 BOOLEAN Result = FALSE;
538 LPLOGPALETTE Palette, TextPalette;
539
540 /* Allocate storage space for the palettes */
541 Palette = RtlAllocateHeap(RtlGetProcessHeap(),
542 HEAP_ZERO_MEMORY,
543 sizeof(LOGPALETTE) +
544 VGA_MAX_COLORS * sizeof(PALETTEENTRY));
545 TextPalette = RtlAllocateHeap(RtlGetProcessHeap(),
546 HEAP_ZERO_MEMORY,
547 sizeof(LOGPALETTE) +
548 (VGA_AC_PAL_F_REG + 1) * sizeof(PALETTEENTRY));
549 if ((Palette == NULL) || (TextPalette == NULL)) goto Cleanup;
550
551 /* Initialize the palettes */
552 Palette->palVersion = TextPalette->palVersion = 0x0300;
553 Palette->palNumEntries = VGA_MAX_COLORS;
554 TextPalette->palNumEntries = VGA_AC_PAL_F_REG + 1;
555
556 /* Restore the default graphics palette */
557 VgaRestoreDefaultPalette(Palette->palPalEntry, Palette->palNumEntries);
558
559 /* Set the default text palette */
560 for (i = 0; i < TextPalette->palNumEntries; i++)
561 {
562 /* Set the palette entries */
563 TextPalette->palPalEntry[i].peRed = GetRValue(ConsoleColors[i]);
564 TextPalette->palPalEntry[i].peGreen = GetGValue(ConsoleColors[i]);
565 TextPalette->palPalEntry[i].peBlue = GetBValue(ConsoleColors[i]);
566 TextPalette->palPalEntry[i].peFlags = 0;
567 }
568
569 /* Create the palettes */
570 PaletteHandle = CreatePalette(Palette);
571 TextPaletteHandle = CreatePalette(TextPalette);
572
573 if (PaletteHandle != NULL && TextPaletteHandle != NULL)
574 {
575 /* The palettes have been created successfully */
576 Result = TRUE;
577 }
578
579 Cleanup:
580 /* Free the palettes */
581 if (Palette) RtlFreeHeap(RtlGetProcessHeap(), 0, Palette);
582 if (TextPalette) RtlFreeHeap(RtlGetProcessHeap(), 0, TextPalette);
583
584 if (!Result)
585 {
586 /* Something failed, delete the palettes */
587 if (PaletteHandle) DeleteObject(PaletteHandle);
588 if (TextPaletteHandle) DeleteObject(TextPaletteHandle);
589 }
590
591 return Result;
592 }
593
VgaResetPalette(VOID)594 static VOID VgaResetPalette(VOID)
595 {
596 PALETTEENTRY Entries[VGA_MAX_COLORS];
597
598 /* Restore the default palette */
599 VgaRestoreDefaultPalette(Entries, VGA_MAX_COLORS);
600 SetPaletteEntries(PaletteHandle, 0, VGA_MAX_COLORS, Entries);
601 PaletteChanged = TRUE;
602 }
603
VgaEnterNewMode(SCREEN_MODE NewScreenMode,PCOORD Resolution)604 static BOOL VgaEnterNewMode(SCREEN_MODE NewScreenMode, PCOORD Resolution)
605 {
606 /* Check if the new mode is alphanumeric */
607 if (NewScreenMode == TEXT_MODE)
608 {
609 /* Enter new text mode */
610
611 if (!VgaConsoleCreateTextScreen(// &TextFramebuffer,
612 Resolution,
613 TextPaletteHandle))
614 {
615 DisplayMessage(L"An unexpected VGA error occurred while switching into text mode. Error: %u", GetLastError());
616 EmulatorTerminate();
617 return FALSE;
618 }
619
620 /* The active framebuffer is now the text framebuffer */
621 ActiveFramebuffer = TextFramebuffer;
622
623 /* Set the screen mode flag */
624 ScreenMode = TEXT_MODE;
625
626 return TRUE;
627 }
628 else
629 {
630 /* Enter graphics mode */
631
632 if (!VgaConsoleCreateGraphicsScreen(// &GraphicsFramebuffer,
633 Resolution,
634 PaletteHandle))
635 {
636 DisplayMessage(L"An unexpected VGA error occurred while switching into graphics mode. Error: %u", GetLastError());
637 EmulatorTerminate();
638 return FALSE;
639 }
640
641 /* The active framebuffer is now the graphics framebuffer */
642 ActiveFramebuffer = GraphicsFramebuffer;
643
644 /* Set the screen mode flag */
645 ScreenMode = GRAPHICS_MODE;
646
647 return TRUE;
648 }
649 }
650
VgaLeaveCurrentMode(VOID)651 static VOID VgaLeaveCurrentMode(VOID)
652 {
653 /* Leave the current video mode */
654 if (ScreenMode == GRAPHICS_MODE)
655 {
656 VgaConsoleDestroyGraphicsScreen();
657
658 /* Cleanup the video data */
659 GraphicsFramebuffer = NULL;
660 }
661 else
662 {
663 VgaConsoleDestroyTextScreen();
664
665 /* Cleanup the video data */
666 // TextFramebuffer = NULL;
667 // NEVER SET the ALWAYS-SET TextFramebuffer pointer to NULL!!
668 }
669
670 /* Reset the active framebuffer */
671 ActiveFramebuffer = NULL;
672 }
673
VgaChangeMode(VOID)674 static VOID VgaChangeMode(VOID)
675 {
676 COORD NewResolution = VgaGetDisplayResolution();
677 SCREEN_MODE NewScreenMode =
678 !(VgaGcRegisters[VGA_GC_MISC_REG] & VGA_GC_MISC_NOALPHA) ? TEXT_MODE
679 : GRAPHICS_MODE;
680
681 /*
682 * Do not switch to a different screen mode + resolution if the new settings
683 * are the same as the old ones. Just repaint the full screen.
684 */
685 if ((ScreenMode == NewScreenMode) && // CurrResolution == NewResolution
686 (CurrResolution.X == NewResolution.X && CurrResolution.Y == NewResolution.Y))
687 {
688 goto Quit;
689 }
690
691 // FIXME: Wouldn't it be preferrable to switch to the new console SB
692 // *ONLY* if we succeeded in setting the new mode??
693
694 /* Leave the current video mode */
695 VgaLeaveCurrentMode(); // ScreenMode
696
697 /* Update the current resolution */
698 CurrResolution = NewResolution;
699
700 /* Change the screen mode */
701 if (!VgaEnterNewMode(NewScreenMode, &CurrResolution))
702 return;
703
704 Quit:
705
706 /* Trigger a full update of the screen */
707 NeedsUpdate = TRUE;
708 UpdateRectangle.Left = 0;
709 UpdateRectangle.Top = 0;
710 UpdateRectangle.Right = CurrResolution.X;
711 UpdateRectangle.Bottom = CurrResolution.Y;
712
713 /* Reset the mode change flag */
714 ModeChanged = FALSE;
715 }
716
VgaMarkForUpdate(SHORT Row,SHORT Column)717 static inline VOID VgaMarkForUpdate(SHORT Row, SHORT Column)
718 {
719 /* Check if this is the first time the rectangle is updated */
720 if (!NeedsUpdate)
721 {
722 UpdateRectangle.Left = UpdateRectangle.Top = MAXSHORT;
723 UpdateRectangle.Right = UpdateRectangle.Bottom = MINSHORT;
724 }
725
726 /* Expand the rectangle to include the point */
727 UpdateRectangle.Left = min(UpdateRectangle.Left, Column);
728 UpdateRectangle.Right = max(UpdateRectangle.Right, Column);
729 UpdateRectangle.Top = min(UpdateRectangle.Top, Row);
730 UpdateRectangle.Bottom = max(UpdateRectangle.Bottom, Row);
731
732 /* Set the update request flag */
733 NeedsUpdate = TRUE;
734 }
735
VgaUpdateFramebuffer(VOID)736 static VOID VgaUpdateFramebuffer(VOID)
737 {
738 SHORT i, j, k;
739 DWORD AddressSize = VgaGetAddressSize();
740 DWORD Address = StartAddressLatch;
741 BYTE BytePanning = (VgaCrtcRegisters[VGA_CRTC_PRESET_ROW_SCAN_REG] >> 5) & 3;
742 WORD LineCompare = VgaCrtcRegisters[VGA_CRTC_LINE_COMPARE_REG]
743 | ((VgaCrtcRegisters[VGA_CRTC_OVERFLOW_REG] & VGA_CRTC_OVERFLOW_LC8) << 4)
744 | ((VgaCrtcRegisters[VGA_CRTC_MAX_SCAN_LINE_REG] & VGA_CRTC_MAXSCANLINE_LC9) << 3);
745 BYTE PixelShift = VgaAcRegisters[VGA_AC_HORZ_PANNING_REG] & 0x0F;
746
747 /*
748 * If the console framebuffer is NULL, that means something
749 * went wrong earlier and this is the final display refresh.
750 */
751 if (ActiveFramebuffer == NULL) return;
752
753 /* Check if we are in text or graphics mode */
754 if (ScreenMode == GRAPHICS_MODE)
755 {
756 /* Graphics mode */
757 PBYTE GraphicsBuffer = (PBYTE)ActiveFramebuffer;
758 DWORD InterlaceHighBit = VGA_INTERLACE_HIGH_BIT;
759 SHORT X;
760
761 /*
762 * Synchronize access to the graphics framebuffer
763 * with the console framebuffer mutex.
764 */
765 WaitForSingleObject(ConsoleMutex, INFINITE);
766
767 /* Shift the high bit right by 1 in odd/even mode */
768 if (VgaGcRegisters[VGA_GC_MODE_REG] & VGA_GC_MODE_OE)
769 {
770 InterlaceHighBit >>= 1;
771 }
772
773 if (VgaCrtcRegisters[VGA_CRTC_MAX_SCAN_LINE_REG] & VGA_CRTC_MAXSCANLINE_DOUBLE)
774 {
775 /* Halve the line compare value */
776 LineCompare >>= 1;
777 }
778 else
779 {
780 /* Divide the line compare value by the maximum scan line */
781 LineCompare /= 1 + (VgaCrtcRegisters[VGA_CRTC_MAX_SCAN_LINE_REG] & 0x1F);
782 }
783
784 /* Loop through the scanlines */
785 for (i = 0; i < CurrResolution.Y; i++)
786 {
787 if (i == LineCompare)
788 {
789 if (VgaAcRegisters[VGA_AC_CONTROL_REG] & VGA_AC_CONTROL_PPM)
790 {
791 /*
792 * Disable the pixel shift count and byte panning
793 * for the rest of the display cycle
794 */
795 PixelShift = 0;
796 BytePanning = 0;
797 }
798
799 /* Reset the address, but assume the preset row scan is 0 */
800 Address = BytePanning;
801 }
802
803 if ((VgaGcRegisters[VGA_GC_MISC_REG] & VGA_GC_MISC_OE) && (i & 1))
804 {
805 /* Odd-numbered line in interlaced mode - set the high bit */
806 Address |= InterlaceHighBit;
807 }
808
809 /* Loop through the pixels */
810 for (j = 0; j < CurrResolution.X; j++)
811 {
812 BYTE PixelData = 0;
813
814 /* Apply horizontal pixel panning */
815 if (VgaAcRegisters[VGA_AC_CONTROL_REG] & VGA_AC_CONTROL_8BIT)
816 {
817 X = j + ((PixelShift >> 1) & 0x03);
818 }
819 else
820 {
821 X = j + ((PixelShift < 8) ? PixelShift : -1);
822 }
823
824 if (VgaSeqRegisters[SVGA_SEQ_EXT_MODE_REG] & SVGA_SEQ_EXT_MODE_HIGH_RES)
825 {
826 // TODO: Check for high color modes
827
828 /* 256 color mode */
829 PixelData = VgaMemory[Address + X];
830 }
831 else
832 {
833 /* Check the shifting mode */
834 if (VgaGcRegisters[VGA_GC_MODE_REG] & VGA_GC_MODE_SHIFT256)
835 {
836 /* 4 bits shifted from each plane */
837
838 /* Check if this is 16 or 256 color mode */
839 if (VgaAcRegisters[VGA_AC_CONTROL_REG] & VGA_AC_CONTROL_8BIT)
840 {
841 /* One byte per pixel */
842 PixelData = VgaMemory[WRAP_OFFSET((Address + (X / VGA_NUM_BANKS)) * AddressSize)
843 * VGA_NUM_BANKS + (X % VGA_NUM_BANKS)];
844 }
845 else
846 {
847 /* 4-bits per pixel */
848
849 PixelData = VgaMemory[WRAP_OFFSET((Address + (X / (VGA_NUM_BANKS * 2))) * AddressSize)
850 * VGA_NUM_BANKS + ((X / 2) % VGA_NUM_BANKS)];
851
852 /* Check if we should use the highest 4 bits or lowest 4 */
853 if ((X % 2) == 0)
854 {
855 /* Highest 4 */
856 PixelData >>= 4;
857 }
858 else
859 {
860 /* Lowest 4 */
861 PixelData &= 0x0F;
862 }
863 }
864 }
865 else if (VgaGcRegisters[VGA_GC_MODE_REG] & VGA_GC_MODE_SHIFTREG)
866 {
867 /* Check if this is 16 or 256 color mode */
868 if (VgaAcRegisters[VGA_AC_CONTROL_REG] & VGA_AC_CONTROL_8BIT)
869 {
870 // TODO: NOT IMPLEMENTED
871 DPRINT1("8-bit interleaved mode is not implemented!\n");
872 }
873 else
874 {
875 /*
876 * 2 bits shifted from plane 0 and 2 for the first 4 pixels,
877 * then 2 bits shifted from plane 1 and 3 for the next 4
878 */
879 DWORD BankNumber = (X / 4) % 2;
880 DWORD Offset = Address + (X / 8);
881 BYTE LowPlaneData = VgaMemory[WRAP_OFFSET(Offset * AddressSize) * VGA_NUM_BANKS + BankNumber];
882 BYTE HighPlaneData = VgaMemory[WRAP_OFFSET(Offset * AddressSize) * VGA_NUM_BANKS + (BankNumber + 2)];
883
884 /* Extract the two bits from each plane */
885 LowPlaneData = (LowPlaneData >> (6 - ((X % 4) * 2))) & 0x03;
886 HighPlaneData = (HighPlaneData >> (6 - ((X % 4) * 2))) & 0x03;
887
888 /* Combine them into the pixel */
889 PixelData = LowPlaneData | (HighPlaneData << 2);
890 }
891 }
892 else
893 {
894 /* 1 bit shifted from each plane */
895
896 /* Check if this is 16 or 256 color mode */
897 if (VgaAcRegisters[VGA_AC_CONTROL_REG] & VGA_AC_CONTROL_8BIT)
898 {
899 /* 8 bits per pixel, 2 on each plane */
900
901 for (k = 0; k < VGA_NUM_BANKS; k++)
902 {
903 /* The data is on plane k, 4 pixels per byte */
904 BYTE PlaneData = VgaMemory[WRAP_OFFSET((Address + (X >> 2)) * AddressSize) * VGA_NUM_BANKS + k];
905
906 /* The mask of the first bit in the pair */
907 BYTE BitMask = 1 << (((3 - (X % VGA_NUM_BANKS)) * 2) + 1);
908
909 /* Bits 0, 1, 2 and 3 come from the first bit of the pair */
910 if (PlaneData & BitMask) PixelData |= 1 << k;
911
912 /* Bits 4, 5, 6 and 7 come from the second bit of the pair */
913 if (PlaneData & (BitMask >> 1)) PixelData |= 1 << (k + 4);
914 }
915 }
916 else
917 {
918 /* 4 bits per pixel, 1 on each plane */
919
920 for (k = 0; k < VGA_NUM_BANKS; k++)
921 {
922 BYTE PlaneData = VgaMemory[WRAP_OFFSET((Address + (X >> 3)) * AddressSize) * VGA_NUM_BANKS + k];
923
924 /* If the bit on that plane is set, set it */
925 if (PlaneData & (1 << (7 - (X % 8)))) PixelData |= 1 << k;
926 }
927 }
928 }
929 }
930
931 if (!(VgaAcRegisters[VGA_AC_CONTROL_REG] & VGA_AC_CONTROL_8BIT))
932 {
933 /*
934 * In 16 color mode, the value is an index to the AC registers
935 * if external palette access is disabled, otherwise (in case
936 * of palette loading) it is a blank pixel.
937 */
938
939 if (VgaAcPalDisable)
940 {
941 if (!(VgaAcRegisters[VGA_AC_CONTROL_REG] & VGA_AC_CONTROL_P54S))
942 {
943 /* Bits 4 and 5 are taken from the palette register */
944 PixelData = ((VgaAcRegisters[VGA_AC_COLOR_SEL_REG] << 4) & 0xC0)
945 | (VgaAcRegisters[PixelData & 0x0F] & 0x3F);
946 }
947 else
948 {
949 /* Bits 4 and 5 are taken from the color select register */
950 PixelData = (VgaAcRegisters[VGA_AC_COLOR_SEL_REG] << 4)
951 | (VgaAcRegisters[PixelData & 0x0F] & 0x0F);
952 }
953 }
954 else
955 {
956 PixelData = 0;
957 }
958 }
959
960 /* Take into account DoubleVision mode when checking for pixel updates */
961 if (DoubleWidth && DoubleHeight)
962 {
963 /* Now check if the resulting pixel data has changed */
964 if (GraphicsBuffer[(i * 2 * CurrResolution.X * 2) + (j * 2)] != PixelData)
965 {
966 /* Yes, write the new value */
967 GraphicsBuffer[(i * 2 * CurrResolution.X * 2) + (j * 2)] = PixelData;
968 GraphicsBuffer[(i * 2 * CurrResolution.X * 2) + (j * 2 + 1)] = PixelData;
969 GraphicsBuffer[((i * 2 + 1) * CurrResolution.X * 2) + (j * 2)] = PixelData;
970 GraphicsBuffer[((i * 2 + 1) * CurrResolution.X * 2) + (j * 2 + 1)] = PixelData;
971
972 /* Mark the specified pixel as changed */
973 VgaMarkForUpdate(i, j);
974 }
975 }
976 else if (DoubleWidth && !DoubleHeight)
977 {
978 /* Now check if the resulting pixel data has changed */
979 if (GraphicsBuffer[(i * CurrResolution.X * 2) + (j * 2)] != PixelData)
980 {
981 /* Yes, write the new value */
982 GraphicsBuffer[(i * CurrResolution.X * 2) + (j * 2)] = PixelData;
983 GraphicsBuffer[(i * CurrResolution.X * 2) + (j * 2 + 1)] = PixelData;
984
985 /* Mark the specified pixel as changed */
986 VgaMarkForUpdate(i, j);
987 }
988 }
989 else if (!DoubleWidth && DoubleHeight)
990 {
991 /* Now check if the resulting pixel data has changed */
992 if (GraphicsBuffer[(i * 2 * CurrResolution.X) + j] != PixelData)
993 {
994 /* Yes, write the new value */
995 GraphicsBuffer[(i * 2 * CurrResolution.X) + j] = PixelData;
996 GraphicsBuffer[((i * 2 + 1) * CurrResolution.X) + j] = PixelData;
997
998 /* Mark the specified pixel as changed */
999 VgaMarkForUpdate(i, j);
1000 }
1001 }
1002 else // if (!DoubleWidth && !DoubleHeight)
1003 {
1004 /* Now check if the resulting pixel data has changed */
1005 if (GraphicsBuffer[i * CurrResolution.X + j] != PixelData)
1006 {
1007 /* Yes, write the new value */
1008 GraphicsBuffer[i * CurrResolution.X + j] = PixelData;
1009
1010 /* Mark the specified pixel as changed */
1011 VgaMarkForUpdate(i, j);
1012 }
1013 }
1014 }
1015
1016 if ((VgaGcRegisters[VGA_GC_MISC_REG] & VGA_GC_MISC_OE) && (i & 1))
1017 {
1018 /* Clear the high bit */
1019 Address &= ~InterlaceHighBit;
1020 }
1021
1022 if (!(VgaGcRegisters[VGA_GC_MISC_REG] & VGA_GC_MISC_OE) || (i & 1))
1023 {
1024 /* Move to the next scanline */
1025 Address += ScanlineSizeLatch;
1026 }
1027 }
1028
1029 /*
1030 * Release the console framebuffer mutex
1031 * so that we allow for repainting.
1032 */
1033 ReleaseMutex(ConsoleMutex);
1034 }
1035 else
1036 {
1037 /* Text mode */
1038 DWORD CurrentAddr;
1039 PCHAR_CELL CharBuffer = (PCHAR_CELL)ActiveFramebuffer;
1040 CHAR_CELL CharInfo;
1041
1042 /*
1043 * Technically, the horizontal panning and preset row count should
1044 * affect text mode too. However, it works on pixels and not characters,
1045 * so we can't support it currently.
1046 */
1047
1048 /* Loop through the scanlines */
1049 for (i = 0; i < CurrResolution.Y; i++)
1050 {
1051 /* Loop through the characters */
1052 for (j = 0; j < CurrResolution.X; j++)
1053 {
1054 CurrentAddr = WRAP_OFFSET((Address + j) * AddressSize);
1055
1056 /* Plane 0 holds the character itself */
1057 CharInfo.Char = VgaMemory[CurrentAddr * VGA_NUM_BANKS];
1058
1059 /* Plane 1 holds the attribute */
1060 CharInfo.Attributes = VgaMemory[CurrentAddr * VGA_NUM_BANKS + 1];
1061
1062 /* Now check if the resulting character data has changed */
1063 if ((CharBuffer[i * CurrResolution.X + j].Char != CharInfo.Char) ||
1064 (CharBuffer[i * CurrResolution.X + j].Attributes != CharInfo.Attributes))
1065 {
1066 /* Yes, write the new value */
1067 CharBuffer[i * CurrResolution.X + j] = CharInfo;
1068
1069 /* Mark the specified cell as changed */
1070 VgaMarkForUpdate(i, j);
1071 }
1072 }
1073
1074 /* Move to the next scanline */
1075 Address += ScanlineSizeLatch;
1076 }
1077 }
1078 }
1079
VgaUpdateTextCursor(VOID)1080 static VOID VgaUpdateTextCursor(VOID)
1081 {
1082 BOOL CursorVisible = !(VgaCrtcRegisters[VGA_CRTC_CURSOR_START_REG] & 0x20);
1083 BYTE CursorStart = VgaCrtcRegisters[VGA_CRTC_CURSOR_START_REG] & 0x1F;
1084 BYTE CursorEnd = VgaCrtcRegisters[VGA_CRTC_CURSOR_END_REG] & 0x1F;
1085
1086 DWORD ScanlineSize = (DWORD)VgaCrtcRegisters[VGA_CRTC_OFFSET_REG] * 2;
1087 BYTE TextSize = 1 + (VgaCrtcRegisters[VGA_CRTC_MAX_SCAN_LINE_REG] & 0x1F);
1088 WORD Location = MAKEWORD(VgaCrtcRegisters[VGA_CRTC_CURSOR_LOC_LOW_REG],
1089 VgaCrtcRegisters[VGA_CRTC_CURSOR_LOC_HIGH_REG]);
1090
1091 /* Just return if we are not in text mode */
1092 if (ScreenMode != TEXT_MODE) return;
1093
1094 /* Add the cursor skew to the location */
1095 Location += (VgaCrtcRegisters[VGA_CRTC_CURSOR_END_REG] >> 5) & 0x03;
1096
1097 VgaConsoleUpdateTextCursor(CursorVisible, CursorStart, CursorEnd,
1098 TextSize, ScanlineSize, Location);
1099
1100 /* Reset the cursor changed flag */
1101 CursorChanged = FALSE;
1102 }
1103
VgaReadPort(USHORT Port)1104 static BYTE WINAPI VgaReadPort(USHORT Port)
1105 {
1106 DPRINT("VgaReadPort: Port 0x%X\n", Port);
1107
1108 if (Port != VGA_DAC_MASK) SvgaHdrCounter = 0;
1109
1110 switch (Port)
1111 {
1112 case VGA_MISC_READ:
1113 return VgaMiscRegister;
1114
1115 case VGA_INSTAT0_READ:
1116 return 0; // Not implemented
1117
1118 case VGA_INSTAT1_READ_MONO:
1119 case VGA_INSTAT1_READ_COLOR:
1120 {
1121 BYTE Result = 0;
1122 BOOLEAN Vsync, Hsync;
1123 ULONGLONG Cycles = CurrentCycleCount;
1124 ULONG CyclesPerMicrosecond = (ULONG)((CurrentIps + 500000ULL) / 1000000ULL);
1125 ULONG Dots = (VgaSeqRegisters[VGA_SEQ_CLOCK_REG] & 1) ? 9 : 8;
1126 ULONG Clock = VgaGetClockFrequency() / 1000000;
1127 ULONG HblankStart, HblankEnd;
1128 ULONG HblankDuration;
1129 ULONG VerticalRetraceStart = VgaCrtcRegisters[VGA_CRTC_START_VERT_RETRACE_REG];
1130 ULONG VerticalRetraceEnd;
1131
1132 VerticalRetraceStart |= (VgaCrtcRegisters[VGA_CRTC_OVERFLOW_REG] & VGA_CRTC_OVERFLOW_VRS8) << 6;
1133 VerticalRetraceStart |= (VgaCrtcRegisters[VGA_CRTC_OVERFLOW_REG] & VGA_CRTC_OVERFLOW_VRS9) << 2;
1134
1135 VerticalRetraceEnd = VerticalRetraceStart + (VgaCrtcRegisters[VGA_CRTC_END_VERT_RETRACE_REG] & 0x0F);
1136
1137 if (VgaGcRegisters[VGA_GC_MISC_REG] & VGA_GC_MISC_NOALPHA)
1138 {
1139 BYTE MaximumScanLine = 1 + (VgaCrtcRegisters[VGA_CRTC_MAX_SCAN_LINE_REG] & 0x1F);
1140
1141 if (VgaCrtcRegisters[VGA_CRTC_MAX_SCAN_LINE_REG] & VGA_CRTC_MAXSCANLINE_DOUBLE)
1142 {
1143 VerticalRetraceStart <<= 1;
1144 VerticalRetraceEnd <<= 1;
1145 }
1146 else
1147 {
1148 VerticalRetraceStart *= MaximumScanLine;
1149 VerticalRetraceEnd *= MaximumScanLine;
1150 }
1151 }
1152
1153 /* Calculate the horizontal blanking duration in cycles */
1154 HblankStart = VgaCrtcRegisters[VGA_CRTC_START_HORZ_BLANKING_REG] & 0x1F;
1155 HblankEnd = VgaCrtcRegisters[VGA_CRTC_END_HORZ_BLANKING_REG] & 0x1F;
1156 if (HblankEnd < HblankStart) HblankEnd |= 0x20;
1157 HblankDuration = ((HblankEnd - HblankStart) * Dots
1158 * CyclesPerMicrosecond + (Clock >> 1)) / Clock;
1159
1160 Vsync = ScanlineCounter >= VerticalRetraceStart && ScanlineCounter <= VerticalRetraceEnd;
1161 Hsync = (Cycles - HorizontalRetraceCycle) < (ULONGLONG)HblankDuration;
1162
1163 /* Reset the AC latch */
1164 VgaAcLatch = FALSE;
1165
1166 /* Set a flag if there is a vertical or horizontal retrace */
1167 if (Vsync || Hsync) Result |= VGA_STAT_DD;
1168
1169 /* Set an additional flag if there was a vertical retrace */
1170 if (Vsync) Result |= VGA_STAT_VRETRACE;
1171
1172 return Result;
1173 }
1174
1175 case VGA_FEATURE_READ:
1176 return VgaFeatureRegister;
1177
1178 case VGA_AC_INDEX:
1179 return VgaAcIndex | (VgaAcPalDisable ? 0x20 : 0x00);
1180
1181 case VGA_AC_READ:
1182 return VgaAcRegisters[VgaAcIndex];
1183
1184 case VGA_SEQ_INDEX:
1185 return VgaSeqIndex;
1186
1187 case VGA_SEQ_DATA:
1188 return VgaSeqRegisters[VgaSeqIndex];
1189
1190 case VGA_DAC_MASK:
1191 {
1192 if (SvgaHdrCounter == 4)
1193 {
1194 SvgaHdrCounter = 0;
1195 return SvgaHiddenRegister;
1196 }
1197 else
1198 {
1199 SvgaHdrCounter++;
1200 return VgaDacMask;
1201 }
1202 }
1203
1204 case VGA_DAC_READ_INDEX:
1205 /* This returns the read/write state */
1206 return (VgaDacReadWrite ? 0 : 3);
1207
1208 case VGA_DAC_WRITE_INDEX:
1209 return VgaDacIndex;
1210
1211 case VGA_DAC_DATA:
1212 {
1213 /* Ignore reads in write mode */
1214 if (!VgaDacReadWrite)
1215 {
1216 BYTE Data = VgaDacRegisters[VgaDacIndex * 3 + VgaDacLatchCounter];
1217 VgaDacLatchCounter++;
1218
1219 if (VgaDacLatchCounter == 3)
1220 {
1221 /* Reset the latch counter and increment the palette index */
1222 VgaDacLatchCounter = 0;
1223 VgaDacIndex++;
1224 VgaDacIndex %= VGA_MAX_COLORS;
1225 }
1226
1227 return Data;
1228 }
1229
1230 break;
1231 }
1232
1233 case VGA_CRTC_INDEX_MONO:
1234 case VGA_CRTC_INDEX_COLOR:
1235 return VgaCrtcIndex;
1236
1237 case VGA_CRTC_DATA_MONO:
1238 case VGA_CRTC_DATA_COLOR:
1239 return VgaCrtcRegisters[VgaCrtcIndex];
1240
1241 case VGA_GC_INDEX:
1242 return VgaGcIndex;
1243
1244 case VGA_GC_DATA:
1245 return VgaGcRegisters[VgaGcIndex];
1246
1247 default:
1248 DPRINT1("VgaReadPort: Unknown port 0x%X\n", Port);
1249 break;
1250 }
1251
1252 return 0;
1253 }
1254
VgaWriteSequencer(BYTE Data)1255 static inline VOID VgaWriteSequencer(BYTE Data)
1256 {
1257 /* Save the value */
1258 VgaSeqRegisters[VgaSeqIndex & VGA_SEQ_INDEX_MASK] = Data;
1259
1260 /* Check the index */
1261 switch (VgaSeqIndex & VGA_SEQ_INDEX_MASK)
1262 {
1263 case SVGA_SEQ_UNLOCK_REG:
1264 {
1265 if ((Data & SVGA_SEQ_UNLOCK_MASK) == SVGA_SEQ_UNLOCKED)
1266 {
1267 /* Unlock SVGA extensions */
1268 VgaSeqRegisters[SVGA_SEQ_UNLOCK_REG] = SVGA_SEQ_UNLOCKED;
1269 }
1270 else
1271 {
1272 /* Lock SVGA extensions */
1273 VgaSeqRegisters[SVGA_SEQ_UNLOCK_REG] = SVGA_SEQ_LOCKED;
1274 }
1275
1276 break;
1277 }
1278 }
1279 }
1280
VgaWriteGc(BYTE Data)1281 static inline VOID VgaWriteGc(BYTE Data)
1282 {
1283 /* Save the value */
1284 VgaGcRegisters[VgaGcIndex & VGA_GC_INDEX_MASK] = Data;
1285
1286 /* Check the index */
1287 switch (VgaGcIndex & VGA_GC_INDEX_MASK)
1288 {
1289 case VGA_GC_MISC_REG:
1290 {
1291 /* Remove any existing VGA memory hook */
1292 MemRemoveFastMemoryHook((PVOID)0xA0000, 0x20000);
1293
1294 if (VgaMiscRegister & VGA_MISC_RAM_ENABLED)
1295 {
1296 UCHAR MemoryMap = (VgaGcRegisters[VGA_GC_MISC_REG] >> 2) & 0x03;
1297
1298 /* Register a memory hook */
1299 MemInstallFastMemoryHook(UlongToPtr(MemoryBase[MemoryMap]),
1300 MemorySize[MemoryMap],
1301 VgaReadMemory,
1302 VgaWriteMemory);
1303 }
1304
1305 /* The GC misc register decides if it's text or graphics mode */
1306 ModeChanged = TRUE;
1307 break;
1308 }
1309 }
1310 }
1311
VgaWriteCrtc(BYTE Data)1312 static inline VOID VgaWriteCrtc(BYTE Data)
1313 {
1314 /* Save the value */
1315 VgaCrtcRegisters[VgaCrtcIndex & VGA_CRTC_INDEX_MASK] = Data;
1316
1317 /* Check the index */
1318 switch (VgaCrtcIndex & VGA_CRTC_INDEX_MASK)
1319 {
1320 case VGA_CRTC_END_HORZ_DISP_REG:
1321 case VGA_CRTC_VERT_DISP_END_REG:
1322 case VGA_CRTC_OVERFLOW_REG:
1323 case VGA_CRTC_MAX_SCAN_LINE_REG:
1324 {
1325 /* The video mode has changed */
1326 ModeChanged = TRUE;
1327 break;
1328 }
1329
1330 case VGA_CRTC_CURSOR_LOC_LOW_REG:
1331 case VGA_CRTC_CURSOR_LOC_HIGH_REG:
1332 case VGA_CRTC_CURSOR_START_REG:
1333 case VGA_CRTC_CURSOR_END_REG:
1334 {
1335 /* Set the cursor changed flag */
1336 CursorChanged = TRUE;
1337 break;
1338 }
1339 }
1340 }
1341
VgaWriteDac(BYTE Data)1342 static inline VOID VgaWriteDac(BYTE Data)
1343 {
1344 UINT i;
1345 PALETTEENTRY Entry;
1346
1347 /* Store the value in the latch */
1348 VgaDacLatch[VgaDacLatchCounter++] = Data;
1349 if (VgaDacLatchCounter < 3) return;
1350
1351 /* Reset the latch counter */
1352 VgaDacLatchCounter = 0;
1353
1354 /* Set the DAC register values */
1355 VgaDacRegisters[VgaDacIndex * 3] = VgaDacLatch[0];
1356 VgaDacRegisters[VgaDacIndex * 3 + 1] = VgaDacLatch[1];
1357 VgaDacRegisters[VgaDacIndex * 3 + 2] = VgaDacLatch[2];
1358
1359 /* Fill the entry structure */
1360 Entry.peRed = VGA_DAC_TO_COLOR(VgaDacLatch[0]);
1361 Entry.peGreen = VGA_DAC_TO_COLOR(VgaDacLatch[1]);
1362 Entry.peBlue = VGA_DAC_TO_COLOR(VgaDacLatch[2]);
1363 Entry.peFlags = 0;
1364
1365 /* Update the palette entry */
1366 SetPaletteEntries(PaletteHandle, VgaDacIndex, 1, &Entry);
1367
1368 /* Check which text palette entries are affected */
1369 for (i = 0; i <= VGA_AC_PAL_F_REG; i++)
1370 {
1371 if (VgaAcRegisters[i] == VgaDacIndex)
1372 {
1373 /* Update the text palette entry */
1374 SetPaletteEntries(TextPaletteHandle, i, 1, &Entry);
1375 }
1376 }
1377
1378 /* Set the palette changed flag */
1379 PaletteChanged = TRUE;
1380
1381 /* Update the index */
1382 VgaDacIndex++;
1383 VgaDacIndex %= VGA_MAX_COLORS;
1384 }
1385
VgaWriteAc(BYTE Data)1386 static inline VOID VgaWriteAc(BYTE Data)
1387 {
1388 PALETTEENTRY Entry;
1389
1390 ASSERT(VgaAcIndex < VGA_AC_MAX_REG);
1391
1392 /* Save the value */
1393 if (VgaAcIndex <= VGA_AC_PAL_F_REG)
1394 {
1395 if (VgaAcPalDisable) return;
1396
1397 // DbgPrint(" AC Palette Writing %d to index %d\n", Data, VgaAcIndex);
1398 if (VgaAcRegisters[VgaAcIndex] != Data)
1399 {
1400 /* Update the AC register */
1401 VgaAcRegisters[VgaAcIndex] = Data;
1402
1403 /* Fill the entry structure */
1404 Entry.peRed = VGA_DAC_TO_COLOR(VgaDacRegisters[Data * 3]);
1405 Entry.peGreen = VGA_DAC_TO_COLOR(VgaDacRegisters[Data * 3 + 1]);
1406 Entry.peBlue = VGA_DAC_TO_COLOR(VgaDacRegisters[Data * 3 + 2]);
1407 Entry.peFlags = 0;
1408
1409 /* Update the palette entry and set the palette change flag */
1410 SetPaletteEntries(TextPaletteHandle, VgaAcIndex, 1, &Entry);
1411 PaletteChanged = TRUE;
1412 }
1413 }
1414 else
1415 {
1416 VgaAcRegisters[VgaAcIndex] = Data;
1417 }
1418 }
1419
VgaWritePort(USHORT Port,BYTE Data)1420 static VOID WINAPI VgaWritePort(USHORT Port, BYTE Data)
1421 {
1422 DPRINT("VgaWritePort: Port 0x%X, Data 0x%02X\n", Port, Data);
1423
1424 switch (Port)
1425 {
1426 case VGA_MISC_WRITE:
1427 {
1428 VgaMiscRegister = Data;
1429
1430 if (VgaMiscRegister & 0x01)
1431 {
1432 /* Color emulation */
1433 DPRINT1("Color emulation\n");
1434
1435 /* Register the new I/O Ports */
1436 RegisterIoPort(0x3D4, VgaReadPort, VgaWritePort); // VGA_CRTC_INDEX_COLOR
1437 RegisterIoPort(0x3D5, VgaReadPort, VgaWritePort); // VGA_CRTC_DATA_COLOR
1438 RegisterIoPort(0x3DA, VgaReadPort, VgaWritePort); // VGA_INSTAT1_READ_COLOR, VGA_FEATURE_WRITE_COLOR
1439
1440 /* Unregister the old ones */
1441 UnregisterIoPort(0x3B4); // VGA_CRTC_INDEX_MONO
1442 UnregisterIoPort(0x3B5); // VGA_CRTC_DATA_MONO
1443 UnregisterIoPort(0x3BA); // VGA_INSTAT1_READ_MONO, VGA_FEATURE_WRITE_MONO
1444 }
1445 else
1446 {
1447 /* Monochrome emulation */
1448 DPRINT1("Monochrome emulation\n");
1449
1450 /* Register the new I/O Ports */
1451 RegisterIoPort(0x3B4, VgaReadPort, VgaWritePort); // VGA_CRTC_INDEX_MONO
1452 RegisterIoPort(0x3B5, VgaReadPort, VgaWritePort); // VGA_CRTC_DATA_MONO
1453 RegisterIoPort(0x3BA, VgaReadPort, VgaWritePort); // VGA_INSTAT1_READ_MONO, VGA_FEATURE_WRITE_MONO
1454
1455 /* Unregister the old ones */
1456 UnregisterIoPort(0x3D4); // VGA_CRTC_INDEX_COLOR
1457 UnregisterIoPort(0x3D5); // VGA_CRTC_DATA_COLOR
1458 UnregisterIoPort(0x3DA); // VGA_INSTAT1_READ_COLOR, VGA_FEATURE_WRITE_COLOR
1459 }
1460
1461 /* Remove any existing VGA memory hook */
1462 MemRemoveFastMemoryHook((PVOID)0xA0000, 0x20000);
1463
1464 if (VgaMiscRegister & VGA_MISC_RAM_ENABLED)
1465 {
1466 UCHAR MemoryMap = (VgaGcRegisters[VGA_GC_MISC_REG] >> 2) & 0x03;
1467
1468 /* Register a memory hook */
1469 MemInstallFastMemoryHook(UlongToPtr(MemoryBase[MemoryMap]),
1470 MemorySize[MemoryMap],
1471 VgaReadMemory,
1472 VgaWriteMemory);
1473 }
1474
1475 break;
1476 }
1477
1478 case VGA_FEATURE_WRITE_MONO:
1479 case VGA_FEATURE_WRITE_COLOR:
1480 {
1481 VgaFeatureRegister = Data;
1482 break;
1483 }
1484
1485 case VGA_AC_INDEX:
1486 // case VGA_AC_WRITE:
1487 {
1488 if (!VgaAcLatch)
1489 {
1490 /* Change the index */
1491 BYTE Index = Data & 0x1F;
1492 if (Index < VGA_AC_MAX_REG) VgaAcIndex = Index;
1493
1494 /*
1495 * Change palette protection by checking for
1496 * the Palette Address Source bit.
1497 */
1498 VgaAcPalDisable = (Data & 0x20) ? TRUE : FALSE;
1499 }
1500 else
1501 {
1502 /* Write the data */
1503 VgaWriteAc(Data);
1504 }
1505
1506 /* Toggle the latch */
1507 VgaAcLatch = !VgaAcLatch;
1508 break;
1509 }
1510
1511 case VGA_SEQ_INDEX:
1512 {
1513 /* Set the sequencer index register */
1514 if ((Data & 0x1F) < SVGA_SEQ_MAX_UNLOCKED_REG
1515 && (Data & 0x1F) != VGA_SEQ_MAX_REG)
1516 {
1517 VgaSeqIndex = Data;
1518 }
1519
1520 break;
1521 }
1522
1523 case VGA_SEQ_DATA:
1524 {
1525 /* Call the sequencer function */
1526 VgaWriteSequencer(Data);
1527 break;
1528 }
1529
1530 case VGA_DAC_MASK:
1531 {
1532 if (SvgaHdrCounter == 4) SvgaHiddenRegister = Data;
1533 else VgaDacMask = Data;
1534
1535 break;
1536 }
1537
1538 case VGA_DAC_READ_INDEX:
1539 {
1540 VgaDacReadWrite = FALSE;
1541 VgaDacIndex = Data;
1542 VgaDacLatchCounter = 0;
1543 break;
1544 }
1545
1546 case VGA_DAC_WRITE_INDEX:
1547 {
1548 VgaDacReadWrite = TRUE;
1549 VgaDacIndex = Data;
1550 VgaDacLatchCounter = 0;
1551 break;
1552 }
1553
1554 case VGA_DAC_DATA:
1555 {
1556 /* Ignore writes in read mode */
1557 if (VgaDacReadWrite) VgaWriteDac(Data & 0x3F);
1558 break;
1559 }
1560
1561 case VGA_CRTC_INDEX_MONO:
1562 case VGA_CRTC_INDEX_COLOR:
1563 {
1564 /* Set the CRTC index register */
1565 if (((Data & VGA_CRTC_INDEX_MASK) < SVGA_CRTC_MAX_UNLOCKED_REG)
1566 && ((Data & VGA_CRTC_INDEX_MASK) < SVGA_CRTC_UNUSED0_REG
1567 || (Data & VGA_CRTC_INDEX_MASK) > SVGA_CRTC_UNUSED6_REG)
1568 && (Data & VGA_CRTC_INDEX_MASK) != SVGA_CRTC_UNUSED7_REG)
1569 {
1570 VgaCrtcIndex = Data;
1571 }
1572
1573 break;
1574 }
1575
1576 case VGA_CRTC_DATA_MONO:
1577 case VGA_CRTC_DATA_COLOR:
1578 {
1579 /* Call the CRTC function */
1580 VgaWriteCrtc(Data);
1581 break;
1582 }
1583
1584 case VGA_GC_INDEX:
1585 {
1586 /* Set the GC index register */
1587 if ((Data & VGA_GC_INDEX_MASK) < SVGA_GC_MAX_UNLOCKED_REG
1588 && (Data & VGA_GC_INDEX_MASK) != SVGA_GC_UNUSED0_REG
1589 && ((Data & VGA_GC_INDEX_MASK) < SVGA_GC_UNUSED1_REG
1590 || (Data & VGA_GC_INDEX_MASK) > SVGA_GC_UNUSED10_REG))
1591 {
1592 VgaGcIndex = Data;
1593 }
1594
1595 break;
1596 }
1597
1598 case VGA_GC_DATA:
1599 {
1600 /* Call the GC function */
1601 VgaWriteGc(Data);
1602 break;
1603 }
1604
1605 default:
1606 DPRINT1("VgaWritePort: Unknown port 0x%X, Data 0x%02X\n", Port, Data);
1607 break;
1608 }
1609
1610 SvgaHdrCounter = 0;
1611 }
1612
VgaVerticalRetrace(VOID)1613 static inline VOID VgaVerticalRetrace(VOID)
1614 {
1615 /* If nothing has changed, just return */
1616 // if (!ModeChanged && !CursorChanged && !PaletteChanged && !NeedsUpdate)
1617 // return;
1618
1619 /* Change the display mode */
1620 if (ModeChanged) VgaChangeMode();
1621
1622 /* Change the text cursor appearance */
1623 if (CursorChanged) VgaUpdateTextCursor();
1624
1625 if (PaletteChanged)
1626 {
1627 /* Trigger a full update of the screen */
1628 NeedsUpdate = TRUE;
1629 UpdateRectangle.Left = 0;
1630 UpdateRectangle.Top = 0;
1631 UpdateRectangle.Right = CurrResolution.X;
1632 UpdateRectangle.Bottom = CurrResolution.Y;
1633
1634 PaletteChanged = FALSE;
1635 }
1636
1637 /* Update the contents of the framebuffer */
1638 VgaUpdateFramebuffer();
1639
1640 /* Ignore if there's nothing to update */
1641 if (!NeedsUpdate) return;
1642
1643 DPRINT("Updating screen rectangle (%d, %d, %d, %d)\n",
1644 UpdateRectangle.Left,
1645 UpdateRectangle.Top,
1646 UpdateRectangle.Right,
1647 UpdateRectangle.Bottom);
1648
1649 VgaConsoleRepaintScreen(&UpdateRectangle);
1650
1651 /* Clear the update flag */
1652 NeedsUpdate = FALSE;
1653 }
1654
VgaHorizontalRetrace(ULONGLONG ElapsedTime)1655 static VOID FASTCALL VgaHorizontalRetrace(ULONGLONG ElapsedTime)
1656 {
1657 ULONG VerticalTotal = VgaCrtcRegisters[VGA_CRTC_VERT_TOTAL_REG];
1658 ULONG VerticalRetraceStart = VgaCrtcRegisters[VGA_CRTC_START_VERT_RETRACE_REG];
1659 BOOLEAN BeforeVSync;
1660 ULONG ElapsedCycles = CurrentCycleCount - HorizontalRetraceCycle;
1661 ULONG Dots = (VgaSeqRegisters[VGA_SEQ_CLOCK_REG] & 1) ? 9 : 8;
1662 ULONG HorizTotalDots = ((ULONG)VgaCrtcRegisters[VGA_CRTC_HORZ_TOTAL_REG] + 5) * Dots;
1663 BYTE MaximumScanLine = 1 + (VgaCrtcRegisters[VGA_CRTC_MAX_SCAN_LINE_REG] & 0x1F);
1664 ULONG HSyncsPerSecond, HSyncs;
1665 UNREFERENCED_PARAMETER(ElapsedTime);
1666
1667 if (VgaAcRegisters[VGA_AC_CONTROL_REG] & VGA_AC_CONTROL_8BIT) HorizTotalDots >>= 1;
1668
1669 HSyncsPerSecond = VgaGetClockFrequency() / HorizTotalDots;
1670 HSyncs = (ElapsedCycles * HSyncsPerSecond + (CurrentIps >> 1)) / CurrentIps;
1671 if (HSyncs == 0) HSyncs = 1;
1672
1673 VerticalTotal |= (VgaCrtcRegisters[VGA_CRTC_OVERFLOW_REG] & VGA_CRTC_OVERFLOW_VT8) << 8;
1674 VerticalTotal |= (VgaCrtcRegisters[VGA_CRTC_OVERFLOW_REG] & VGA_CRTC_OVERFLOW_VT9) << 4;
1675
1676 VerticalRetraceStart |= (VgaCrtcRegisters[VGA_CRTC_OVERFLOW_REG] & VGA_CRTC_OVERFLOW_VRS8) << 6;
1677 VerticalRetraceStart |= (VgaCrtcRegisters[VGA_CRTC_OVERFLOW_REG] & VGA_CRTC_OVERFLOW_VRS9) << 2;
1678
1679 if (VgaGcRegisters[VGA_GC_MISC_REG] & VGA_GC_MISC_NOALPHA)
1680 {
1681 if (VgaCrtcRegisters[VGA_CRTC_MAX_SCAN_LINE_REG] & VGA_CRTC_MAXSCANLINE_DOUBLE)
1682 {
1683 VerticalRetraceStart <<= 1;
1684 VerticalTotal <<= 1;
1685 }
1686 else
1687 {
1688 VerticalRetraceStart *= MaximumScanLine;
1689 VerticalTotal *= MaximumScanLine;
1690 }
1691 }
1692
1693 /* Set the cycle */
1694 HorizontalRetraceCycle = CurrentCycleCount;
1695
1696 /* Increment the scanline counter, but make sure we don't skip any part of the vertical retrace */
1697 BeforeVSync = (ScanlineCounter < VerticalRetraceStart);
1698 ScanlineCounter += HSyncs;
1699 if (BeforeVSync && ScanlineCounter >= VerticalRetraceStart) ScanlineCounter = VerticalRetraceStart;
1700
1701 if (ScanlineCounter == VerticalRetraceStart)
1702 {
1703 /* Save the scanline size */
1704 ScanlineSizeLatch = ((DWORD)VgaCrtcRegisters[VGA_CRTC_OFFSET_REG]
1705 + (((DWORD)VgaCrtcRegisters[SVGA_CRTC_EXT_DISPLAY_REG] & SVGA_CRTC_EXT_OFFSET_BIT8) << 4)) * 2;
1706 if (VgaSeqRegisters[SVGA_SEQ_EXT_MODE_REG] & SVGA_SEQ_EXT_MODE_HIGH_RES) ScanlineSizeLatch <<= 2;
1707
1708 /* Save the starting address */
1709 StartAddressLatch = MAKEWORD(VgaCrtcRegisters[VGA_CRTC_START_ADDR_LOW_REG],
1710 VgaCrtcRegisters[VGA_CRTC_START_ADDR_HIGH_REG])
1711 + ((VgaCrtcRegisters[SVGA_CRTC_EXT_DISPLAY_REG] & SVGA_CRTC_EXT_ADDR_BIT16) << 16)
1712 + ((VgaCrtcRegisters[SVGA_CRTC_EXT_DISPLAY_REG] & SVGA_CRTC_EXT_ADDR_BITS1718) << 15)
1713 + ((VgaCrtcRegisters[SVGA_CRTC_OVERLAY_REG] & SVGA_CRTC_EXT_ADDR_BIT19) << 12)
1714 + (VgaCrtcRegisters[VGA_CRTC_PRESET_ROW_SCAN_REG] & 0x1F) * ScanlineSizeLatch
1715 + ((VgaCrtcRegisters[VGA_CRTC_PRESET_ROW_SCAN_REG] >> 5) & 3);
1716 }
1717
1718 if (ScanlineCounter > VerticalTotal)
1719 {
1720 ScanlineCounter = 0;
1721 VgaVerticalRetrace();
1722 }
1723 }
1724
1725 /* PUBLIC FUNCTIONS ***********************************************************/
1726
VgaGetDisplayResolution(VOID)1727 COORD VgaGetDisplayResolution(VOID)
1728 {
1729 COORD Resolution;
1730 BYTE MaximumScanLine = 1 + (VgaCrtcRegisters[VGA_CRTC_MAX_SCAN_LINE_REG] & 0x1F);
1731
1732 /* The low 8 bits are in the display registers */
1733 Resolution.X = VgaCrtcRegisters[VGA_CRTC_END_HORZ_DISP_REG];
1734 Resolution.Y = VgaCrtcRegisters[VGA_CRTC_VERT_DISP_END_REG];
1735
1736 /* Set the top bits from the overflow register */
1737 if (VgaCrtcRegisters[VGA_CRTC_OVERFLOW_REG] & VGA_CRTC_OVERFLOW_VDE8)
1738 {
1739 Resolution.Y |= 1 << 8;
1740 }
1741 if (VgaCrtcRegisters[VGA_CRTC_OVERFLOW_REG] & VGA_CRTC_OVERFLOW_VDE9)
1742 {
1743 Resolution.Y |= 1 << 9;
1744 }
1745
1746 /* Increase the values by 1 */
1747 Resolution.X++;
1748 Resolution.Y++;
1749
1750 if (VgaGcRegisters[VGA_GC_MISC_REG] & VGA_GC_MISC_NOALPHA)
1751 {
1752 /* In "High Resolution" mode, the width of a character is always 8 pixels */
1753 if (VgaSeqRegisters[SVGA_SEQ_EXT_MODE_REG] & SVGA_SEQ_EXT_MODE_HIGH_RES)
1754 {
1755 Resolution.X *= 8;
1756 }
1757 else
1758 {
1759 /* Multiply the horizontal resolution by the 9/8 dot mode */
1760 Resolution.X *= (VgaSeqRegisters[VGA_SEQ_CLOCK_REG] & VGA_SEQ_CLOCK_98DM)
1761 ? 8 : 9;
1762
1763 /* The horizontal resolution is halved in 8-bit mode */
1764 if (VgaAcRegisters[VGA_AC_CONTROL_REG] & VGA_AC_CONTROL_8BIT) Resolution.X /= 2;
1765 }
1766 }
1767
1768 if (VgaCrtcRegisters[VGA_CRTC_MAX_SCAN_LINE_REG] & VGA_CRTC_MAXSCANLINE_DOUBLE)
1769 {
1770 /* Halve the vertical resolution */
1771 Resolution.Y >>= 1;
1772 }
1773 else
1774 {
1775 /* Divide the vertical resolution by the maximum scan line (== font size in text mode) */
1776 Resolution.Y /= MaximumScanLine;
1777 }
1778
1779 /* Return the resolution */
1780 return Resolution;
1781 }
1782
VgaRefreshDisplay(VOID)1783 VOID VgaRefreshDisplay(VOID)
1784 {
1785 /* Save the scanline size */
1786 ScanlineSizeLatch = ((DWORD)VgaCrtcRegisters[VGA_CRTC_OFFSET_REG]
1787 + (((DWORD)VgaCrtcRegisters[SVGA_CRTC_EXT_DISPLAY_REG] & SVGA_CRTC_EXT_OFFSET_BIT8) << 4)) * 2;
1788 if (VgaSeqRegisters[SVGA_SEQ_EXT_MODE_REG] & SVGA_SEQ_EXT_MODE_HIGH_RES) ScanlineSizeLatch <<= 2;
1789
1790 /* Save the starting address */
1791 StartAddressLatch = MAKEWORD(VgaCrtcRegisters[VGA_CRTC_START_ADDR_LOW_REG],
1792 VgaCrtcRegisters[VGA_CRTC_START_ADDR_HIGH_REG])
1793 + ((VgaCrtcRegisters[SVGA_CRTC_EXT_DISPLAY_REG] & SVGA_CRTC_EXT_ADDR_BIT16) << 16)
1794 + ((VgaCrtcRegisters[SVGA_CRTC_EXT_DISPLAY_REG] & SVGA_CRTC_EXT_ADDR_BITS1718) << 15)
1795 + ((VgaCrtcRegisters[SVGA_CRTC_OVERLAY_REG] & SVGA_CRTC_EXT_ADDR_BIT19) << 12)
1796 + (VgaCrtcRegisters[VGA_CRTC_PRESET_ROW_SCAN_REG] & 0x1F) * ScanlineSizeLatch
1797 + ((VgaCrtcRegisters[VGA_CRTC_PRESET_ROW_SCAN_REG] >> 5) & 3);
1798
1799 VgaVerticalRetrace();
1800 }
1801
VgaReadMemory(ULONG Address,PVOID Buffer,ULONG Size)1802 VOID FASTCALL VgaReadMemory(ULONG Address, PVOID Buffer, ULONG Size)
1803 {
1804 DWORD i;
1805 DWORD VideoAddress;
1806 PUCHAR BufPtr = (PUCHAR)Buffer;
1807
1808 DPRINT("VgaReadMemory: Address 0x%08X, Size %lu\n", Address, Size);
1809
1810 /* Ignore if video RAM access is disabled */
1811 if (!Size) return;
1812 if ((VgaMiscRegister & VGA_MISC_RAM_ENABLED) == 0) return;
1813
1814 if (!(VgaGcRegisters[VGA_GC_MODE_REG] & VGA_GC_MODE_READ))
1815 {
1816 VideoAddress = VgaTranslateAddress(Address);
1817
1818 /* Check for packed pixel, chain-4, and odd-even mode */
1819 if (VgaSeqRegisters[SVGA_SEQ_EXT_MODE_REG] & SVGA_SEQ_EXT_MODE_HIGH_RES)
1820 {
1821 /* Just copy from the video memory */
1822 PVOID VideoMemory = &VgaMemory[VideoAddress + (Address & 3)];
1823
1824 switch (Size)
1825 {
1826 case sizeof(UCHAR):
1827 *(PUCHAR)Buffer = *(PUCHAR)VideoMemory;
1828 return;
1829
1830 case sizeof(USHORT):
1831 *(PUSHORT)Buffer = *(PUSHORT)VideoMemory;
1832 return;
1833
1834 case sizeof(ULONG):
1835 *(PULONG)Buffer = *(PULONG)VideoMemory;
1836 return;
1837
1838 case sizeof(ULONGLONG):
1839 *(PULONGLONG)Buffer = *(PULONGLONG)VideoMemory;
1840 return;
1841
1842 default:
1843 #if defined(__GNUC__)
1844 __builtin_memcpy(Buffer, VideoMemory, Size);
1845 #else
1846 RtlCopyMemory(Buffer, VideoMemory, Size);
1847 #endif
1848 }
1849 }
1850 else if (VgaSeqRegisters[VGA_SEQ_MEM_REG] & VGA_SEQ_MEM_C4)
1851 {
1852 i = 0;
1853
1854 /* Write the unaligned part first */
1855 if (Address & 3)
1856 {
1857 switch (Address & 3)
1858 {
1859 case 1:
1860 BufPtr[i++] = VgaMemory[VideoAddress * VGA_NUM_BANKS + 1];
1861 case 2:
1862 BufPtr[i++] = VgaMemory[VideoAddress * VGA_NUM_BANKS + 2];
1863 case 3:
1864 BufPtr[i++] = VgaMemory[VideoAddress * VGA_NUM_BANKS + 3];
1865 }
1866
1867 VideoAddress += 4;
1868 }
1869
1870 /* Copy the aligned dwords */
1871 while ((i + 3) < Size)
1872 {
1873 *(PULONG)&BufPtr[i] = *(PULONG)&VgaMemory[VideoAddress * VGA_NUM_BANKS];
1874
1875 i += 4;
1876 VideoAddress += 4;
1877 }
1878
1879 /* Write the remaining part */
1880 if (i < Size)
1881 {
1882 switch (Size - i - 3)
1883 {
1884 case 3:
1885 BufPtr[i] = VgaMemory[VideoAddress * VGA_NUM_BANKS + ((Address + i) & 3)];
1886 i++;
1887 case 2:
1888 BufPtr[i] = VgaMemory[VideoAddress * VGA_NUM_BANKS + ((Address + i) & 3)];
1889 i++;
1890 case 1:
1891 BufPtr[i] = VgaMemory[VideoAddress * VGA_NUM_BANKS + ((Address + i) & 3)];
1892 i++;
1893 }
1894 }
1895 }
1896 else if (VgaGcRegisters[VGA_GC_MODE_REG] & VGA_GC_MODE_OE)
1897 {
1898 i = 0;
1899
1900 /* Check if the starting address is odd */
1901 if (Address & 1)
1902 {
1903 BufPtr[i++] = VgaMemory[VideoAddress * VGA_NUM_BANKS + 1];
1904 VideoAddress += 2;
1905 }
1906
1907 while (i < (Size - 1))
1908 {
1909 *(PUSHORT)&BufPtr[i] = *(PUSHORT)&VgaMemory[VideoAddress * VGA_NUM_BANKS];
1910
1911 i += 2;
1912 VideoAddress += 2;
1913 }
1914
1915 /* Check if there is one more byte to read */
1916 if (i == Size - 1) BufPtr[i] = VgaMemory[VideoAddress * VGA_NUM_BANKS + ((Address + i) & 1)];
1917 }
1918 else
1919 {
1920 /* Use the selected map */
1921 BYTE Plane = VgaGcRegisters[VGA_GC_READ_MAP_SEL_REG] & 0x03;
1922
1923 for (i = 0; i < Size; i++)
1924 {
1925 /* Copy the value to the buffer */
1926 BufPtr[i] = VgaMemory[(VideoAddress++) * VGA_NUM_BANKS + Plane];
1927 }
1928 }
1929 }
1930 else
1931 {
1932 const ULONG BitExpandInvertTable[] =
1933 {
1934 0xFFFFFFFF, 0xFFFFFF00, 0xFFFF00FF, 0xFFFF0000,
1935 0xFF00FFFF, 0xFF00FF00, 0xFF0000FF, 0xFF000000,
1936 0x00FFFFFF, 0x00FFFF00, 0x00FF00FF, 0x00FF0000,
1937 0x0000FFFF, 0x0000FF00, 0x000000FF, 0x00000000
1938 };
1939
1940 ULONG ColorCompareBytes = BitExpandInvertTable[VgaGcRegisters[VGA_GC_COLOR_COMPARE_REG] & 0x0F];
1941 ULONG ColorIgnoreBytes = BitExpandInvertTable[VgaGcRegisters[VGA_GC_COLOR_IGNORE_REG] & 0x0F];
1942
1943 /*
1944 * These values can also be computed in the following way, but using the table seems to be faster:
1945 *
1946 * ColorCompareBytes = VgaGcRegisters[VGA_GC_COLOR_COMPARE_REG] * 0x000204081;
1947 * ColorCompareBytes &= 0x01010101;
1948 * ColorCompareBytes = ~((ColorCompareBytes << 8) - ColorCompareBytes);
1949 *
1950 * ColorIgnoreBytes = VgaGcRegisters[VGA_GC_COLOR_IGNORE_REG] * 0x000204081;
1951 * ColorIgnoreBytes &= 0x01010101;
1952 * ColorIgnoreBytes = ~((ColorIgnoreBytes << 8) - ColorIgnoreBytes);
1953 */
1954
1955 /* Loop through each byte */
1956 for (i = 0; i < Size; i++)
1957 {
1958 ULONG PlaneData = 0;
1959
1960 /* This should always return a plane 0 address */
1961 VideoAddress = VgaTranslateAddress(Address + i);
1962
1963 /* Read all 4 planes */
1964 PlaneData = *(PULONG)&VgaMemory[VideoAddress * VGA_NUM_BANKS];
1965
1966 /* Reverse the bytes for which the color compare register is zero */
1967 PlaneData ^= ColorCompareBytes;
1968
1969 /* Apply the color ignore register */
1970 PlaneData |= ColorIgnoreBytes;
1971
1972 /* Store the value in the buffer */
1973 BufPtr[i] = (PlaneData & (PlaneData >> 8) & (PlaneData >> 16) & (PlaneData >> 24)) & 0xFF;
1974 }
1975 }
1976
1977 /* Load the latch registers */
1978 VideoAddress = VgaTranslateAddress(Address + Size - 1);
1979 *(PULONG)VgaLatchRegisters = *(PULONG)&VgaMemory[WRAP_OFFSET(VideoAddress) * VGA_NUM_BANKS];
1980 }
1981
VgaWriteMemory(ULONG Address,PVOID Buffer,ULONG Size)1982 BOOLEAN FASTCALL VgaWriteMemory(ULONG Address, PVOID Buffer, ULONG Size)
1983 {
1984 DWORD i, j;
1985 DWORD VideoAddress;
1986 PUCHAR BufPtr = (PUCHAR)Buffer;
1987
1988 DPRINT("VgaWriteMemory: Address 0x%08X, Size %lu\n", Address, Size);
1989
1990 /* Ignore if video RAM access is disabled */
1991 if ((VgaMiscRegister & VGA_MISC_RAM_ENABLED) == 0) return TRUE;
1992
1993 /* Also ignore if write access to all planes is disabled */
1994 if ((VgaSeqRegisters[VGA_SEQ_MASK_REG] & 0x0F) == 0x00) return TRUE;
1995
1996 if (!(VgaSeqRegisters[SVGA_SEQ_EXT_MODE_REG] & SVGA_SEQ_EXT_MODE_HIGH_RES))
1997 {
1998 /* Loop through each byte */
1999 for (i = 0; i < Size; i++)
2000 {
2001 VideoAddress = VgaTranslateAddress(Address + i);
2002
2003 for (j = 0; j < VGA_NUM_BANKS; j++)
2004 {
2005 /* Make sure the page is writeable */
2006 if (!(VgaSeqRegisters[VGA_SEQ_MASK_REG] & (1 << j))) continue;
2007
2008 /* Check if this is chain-4 mode */
2009 if (VgaSeqRegisters[VGA_SEQ_MEM_REG] & VGA_SEQ_MEM_C4)
2010 {
2011 if (((Address + i) & 0x03) != j)
2012 {
2013 /* This plane will not be accessed */
2014 continue;
2015 }
2016 }
2017
2018 /* Check if this is odd-even mode */
2019 if (VgaGcRegisters[VGA_GC_MODE_REG] & VGA_GC_MODE_OE)
2020 {
2021 if (((Address + i) & 0x01) != (j & 1))
2022 {
2023 /* This plane will not be accessed */
2024 continue;
2025 }
2026 }
2027
2028 /* Copy the value to the VGA memory */
2029 VgaMemory[VideoAddress * VGA_NUM_BANKS + j] = VgaTranslateByteForWriting(BufPtr[i], j);
2030 }
2031 }
2032 }
2033 else
2034 {
2035 PVOID VideoMemory;
2036
2037 // TODO: Apply the page write mask!
2038 // TODO: Check whether the write mode stuff applies to packed-pixel modes
2039
2040 /* Just copy to the video memory */
2041 VideoAddress = VgaTranslateAddress(Address);
2042 VideoMemory = &VgaMemory[VideoAddress + (Address & 3)];
2043
2044 switch (Size)
2045 {
2046 case sizeof(UCHAR):
2047 *(PUCHAR)VideoMemory = *(PUCHAR)Buffer;
2048 return TRUE;
2049
2050 case sizeof(USHORT):
2051 *(PUSHORT)VideoMemory = *(PUSHORT)Buffer;
2052 return TRUE;
2053
2054 case sizeof(ULONG):
2055 *(PULONG)VideoMemory = *(PULONG)Buffer;
2056 return TRUE;
2057
2058 case sizeof(ULONGLONG):
2059 *(PULONGLONG)VideoMemory = *(PULONGLONG)Buffer;
2060 return TRUE;
2061
2062 default:
2063 #if defined(__GNUC__)
2064 __builtin_memcpy(VideoMemory, Buffer, Size);
2065 #else
2066 RtlCopyMemory(VideoMemory, Buffer, Size);
2067 #endif
2068 }
2069 }
2070
2071 return TRUE;
2072 }
2073
VgaClearMemory(VOID)2074 VOID VgaClearMemory(VOID)
2075 {
2076 RtlZeroMemory(VgaMemory, sizeof(VgaMemory));
2077 }
2078
VgaWriteTextModeFont(UINT FontNumber,CONST UCHAR * FontData,UINT Height)2079 VOID VgaWriteTextModeFont(UINT FontNumber, CONST UCHAR* FontData, UINT Height)
2080 {
2081 UINT i, j;
2082 ASSERT(Height <= VGA_MAX_FONT_HEIGHT);
2083
2084 for (i = 0; i < VGA_FONT_CHARACTERS; i++)
2085 {
2086 /* Write the character */
2087 for (j = 0; j < Height; j++)
2088 {
2089 VgaMemory[(i * VGA_MAX_FONT_HEIGHT + j) * VGA_NUM_BANKS + VGA_FONT_BANK] = FontData[i * Height + j];
2090 }
2091
2092 /* Clear the unused part */
2093 for (j = Height; j < VGA_MAX_FONT_HEIGHT; j++)
2094 {
2095 VgaMemory[(i * VGA_MAX_FONT_HEIGHT + j) * VGA_NUM_BANKS + VGA_FONT_BANK] = 0;
2096 }
2097 }
2098 }
2099
VgaInitialize(HANDLE TextHandle)2100 BOOLEAN VgaInitialize(HANDLE TextHandle)
2101 {
2102 if (!VgaConsoleInitialize(TextHandle)) return FALSE;
2103
2104 /* Clear the SEQ, GC, CRTC and AC registers */
2105 RtlZeroMemory(VgaSeqRegisters , sizeof(VgaSeqRegisters ));
2106 RtlZeroMemory(VgaGcRegisters , sizeof(VgaGcRegisters ));
2107 RtlZeroMemory(VgaCrtcRegisters, sizeof(VgaCrtcRegisters));
2108 RtlZeroMemory(VgaAcRegisters , sizeof(VgaAcRegisters ));
2109
2110 /* Initialize the VGA palette and fail if it isn't successfully created */
2111 if (!VgaInitializePalette()) return FALSE;
2112 /***/ VgaResetPalette(); /***/
2113
2114 /* Reset the sequencer */
2115 VgaResetSequencer();
2116
2117 /* Clear the VGA memory */
2118 VgaClearMemory();
2119
2120 /* Register the I/O Ports */
2121 RegisterIoPort(0x3CC, VgaReadPort, NULL); // VGA_MISC_READ
2122 RegisterIoPort(0x3C2, VgaReadPort, VgaWritePort); // VGA_MISC_WRITE, VGA_INSTAT0_READ
2123 RegisterIoPort(0x3CA, VgaReadPort, NULL); // VGA_FEATURE_READ
2124 RegisterIoPort(0x3C0, VgaReadPort, VgaWritePort); // VGA_AC_INDEX, VGA_AC_WRITE
2125 RegisterIoPort(0x3C1, VgaReadPort, NULL); // VGA_AC_READ
2126 RegisterIoPort(0x3C4, VgaReadPort, VgaWritePort); // VGA_SEQ_INDEX
2127 RegisterIoPort(0x3C5, VgaReadPort, VgaWritePort); // VGA_SEQ_DATA
2128 RegisterIoPort(0x3C6, VgaReadPort, VgaWritePort); // VGA_DAC_MASK
2129 RegisterIoPort(0x3C7, VgaReadPort, VgaWritePort); // VGA_DAC_READ_INDEX
2130 RegisterIoPort(0x3C8, VgaReadPort, VgaWritePort); // VGA_DAC_WRITE_INDEX
2131 RegisterIoPort(0x3C9, VgaReadPort, VgaWritePort); // VGA_DAC_DATA
2132 RegisterIoPort(0x3CE, VgaReadPort, VgaWritePort); // VGA_GC_INDEX
2133 RegisterIoPort(0x3CF, VgaReadPort, VgaWritePort); // VGA_GC_DATA
2134
2135 /* CGA ports for compatibility, unimplemented */
2136 RegisterIoPort(0x3D8, VgaReadPort, VgaWritePort); // CGA_MODE_CTRL_REG
2137 RegisterIoPort(0x3D9, VgaReadPort, VgaWritePort); // CGA_PAL_CTRL_REG
2138
2139 HSyncTimer = CreateHardwareTimer(HARDWARE_TIMER_ENABLED, HZ_TO_NS(31469), VgaHorizontalRetrace);
2140
2141 /* Return success */
2142 return TRUE;
2143 }
2144
VgaCleanup(VOID)2145 VOID VgaCleanup(VOID)
2146 {
2147 /* Do a final display refresh */
2148 VgaRefreshDisplay();
2149
2150 DestroyHardwareTimer(HSyncTimer);
2151
2152 /* Leave the current video mode */
2153 VgaLeaveCurrentMode(); // ScreenMode
2154
2155 MemRemoveFastMemoryHook((PVOID)0xA0000, 0x20000);
2156
2157 VgaConsoleCleanup();
2158 }
2159
2160 /* EOF */
2161