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1 | /* -*- linux-c -*- ------------------------------------------------------- * |
2 | * | |
3 | * Copyright (C) 1991, 1992 Linus Torvalds | |
4 | * Copyright 2007 rPath, Inc. - All Rights Reserved | |
cf06de7b | 5 | * Copyright 2009 Intel Corporation; author H. Peter Anvin |
5e8ddcbe PA |
6 | * |
7 | * This file is part of the Linux kernel, and is made available under | |
8 | * the terms of the GNU General Public License version 2. | |
9 | * | |
10 | * ----------------------------------------------------------------------- */ | |
11 | ||
12 | /* | |
5e8ddcbe PA |
13 | * Common all-VGA modes |
14 | */ | |
15 | ||
16 | #include "boot.h" | |
17 | #include "video.h" | |
18 | ||
19 | static struct mode_info vga_modes[] = { | |
1cac5004 PA |
20 | { VIDEO_80x25, 80, 25, 0 }, |
21 | { VIDEO_8POINT, 80, 50, 0 }, | |
22 | { VIDEO_80x43, 80, 43, 0 }, | |
23 | { VIDEO_80x28, 80, 28, 0 }, | |
24 | { VIDEO_80x30, 80, 30, 0 }, | |
25 | { VIDEO_80x34, 80, 34, 0 }, | |
26 | { VIDEO_80x60, 80, 60, 0 }, | |
5e8ddcbe PA |
27 | }; |
28 | ||
29 | static struct mode_info ega_modes[] = { | |
1cac5004 PA |
30 | { VIDEO_80x25, 80, 25, 0 }, |
31 | { VIDEO_8POINT, 80, 43, 0 }, | |
5e8ddcbe PA |
32 | }; |
33 | ||
34 | static struct mode_info cga_modes[] = { | |
1cac5004 | 35 | { VIDEO_80x25, 80, 25, 0 }, |
5e8ddcbe PA |
36 | }; |
37 | ||
a1a00b58 | 38 | static __videocard video_vga; |
5e8ddcbe PA |
39 | |
40 | /* Set basic 80x25 mode */ | |
41 | static u8 vga_set_basic_mode(void) | |
42 | { | |
cf06de7b | 43 | struct biosregs ireg, oreg; |
5e8ddcbe PA |
44 | u16 ax; |
45 | u8 rows; | |
46 | u8 mode; | |
47 | ||
cf06de7b PA |
48 | initregs(&ireg); |
49 | ||
5e8ddcbe | 50 | ax = 0x0f00; |
cf06de7b PA |
51 | intcall(0x10, &ireg, &oreg); |
52 | mode = oreg.al; | |
5e8ddcbe PA |
53 | |
54 | set_fs(0); | |
55 | rows = rdfs8(0x484); /* rows minus one */ | |
56 | ||
cf06de7b | 57 | if ((oreg.ax == 0x5003 || oreg.ax == 0x5007) && |
5e8ddcbe PA |
58 | (rows == 0 || rows == 24)) |
59 | return mode; | |
5e8ddcbe PA |
60 | |
61 | if (mode != 3 && mode != 7) | |
62 | mode = 3; | |
63 | ||
64 | /* Set the mode */ | |
cf06de7b PA |
65 | ireg.ax = mode; /* AH=0: set mode */ |
66 | intcall(0x10, &ireg, NULL); | |
5e8ddcbe PA |
67 | do_restore = 1; |
68 | return mode; | |
69 | } | |
70 | ||
71 | static void vga_set_8font(void) | |
72 | { | |
73 | /* Set 8x8 font - 80x43 on EGA, 80x50 on VGA */ | |
cf06de7b PA |
74 | struct biosregs ireg; |
75 | ||
76 | initregs(&ireg); | |
5e8ddcbe PA |
77 | |
78 | /* Set 8x8 font */ | |
cf06de7b PA |
79 | ireg.ax = 0x1112; |
80 | /* ireg.bl = 0; */ | |
81 | intcall(0x10, &ireg, NULL); | |
5e8ddcbe PA |
82 | |
83 | /* Use alternate print screen */ | |
cf06de7b PA |
84 | ireg.ax = 0x1200; |
85 | ireg.bl = 0x20; | |
86 | intcall(0x10, &ireg, NULL); | |
5e8ddcbe PA |
87 | |
88 | /* Turn off cursor emulation */ | |
cf06de7b PA |
89 | ireg.ax = 0x1201; |
90 | ireg.bl = 0x34; | |
91 | intcall(0x10, &ireg, NULL); | |
5e8ddcbe PA |
92 | |
93 | /* Cursor is scan lines 6-7 */ | |
cf06de7b PA |
94 | ireg.ax = 0x0100; |
95 | ireg.cx = 0x0607; | |
96 | intcall(0x10, &ireg, NULL); | |
5e8ddcbe PA |
97 | } |
98 | ||
99 | static void vga_set_14font(void) | |
100 | { | |
101 | /* Set 9x14 font - 80x28 on VGA */ | |
cf06de7b PA |
102 | struct biosregs ireg; |
103 | ||
104 | initregs(&ireg); | |
5e8ddcbe PA |
105 | |
106 | /* Set 9x14 font */ | |
cf06de7b PA |
107 | ireg.ax = 0x1111; |
108 | /* ireg.bl = 0; */ | |
109 | intcall(0x10, &ireg, NULL); | |
5e8ddcbe PA |
110 | |
111 | /* Turn off cursor emulation */ | |
cf06de7b PA |
112 | ireg.ax = 0x1201; |
113 | ireg.bl = 0x34; | |
114 | intcall(0x10, &ireg, NULL); | |
5e8ddcbe PA |
115 | |
116 | /* Cursor is scan lines 11-12 */ | |
cf06de7b PA |
117 | ireg.ax = 0x0100; |
118 | ireg.cx = 0x0b0c; | |
119 | intcall(0x10, &ireg, NULL); | |
5e8ddcbe PA |
120 | } |
121 | ||
122 | static void vga_set_80x43(void) | |
123 | { | |
124 | /* Set 80x43 mode on VGA (not EGA) */ | |
cf06de7b PA |
125 | struct biosregs ireg; |
126 | ||
127 | initregs(&ireg); | |
5e8ddcbe PA |
128 | |
129 | /* Set 350 scans */ | |
cf06de7b PA |
130 | ireg.ax = 0x1201; |
131 | ireg.bl = 0x30; | |
132 | intcall(0x10, &ireg, NULL); | |
5e8ddcbe PA |
133 | |
134 | /* Reset video mode */ | |
cf06de7b PA |
135 | ireg.ax = 0x0003; |
136 | intcall(0x10, &ireg, NULL); | |
5e8ddcbe PA |
137 | |
138 | vga_set_8font(); | |
139 | } | |
140 | ||
141 | /* I/O address of the VGA CRTC */ | |
142 | u16 vga_crtc(void) | |
143 | { | |
144 | return (inb(0x3cc) & 1) ? 0x3d4 : 0x3b4; | |
145 | } | |
146 | ||
1e274a58 | 147 | static void vga_set_480_scanlines(void) |
5e8ddcbe | 148 | { |
5f641356 PA |
149 | u16 crtc; /* CRTC base address */ |
150 | u8 csel; /* CRTC miscellaneous output register */ | |
5e8ddcbe PA |
151 | |
152 | crtc = vga_crtc(); | |
153 | ||
154 | out_idx(0x0c, crtc, 0x11); /* Vertical sync end, unlock CR0-7 */ | |
155 | out_idx(0x0b, crtc, 0x06); /* Vertical total */ | |
1e274a58 | 156 | out_idx(0x3e, crtc, 0x07); /* Vertical overflow */ |
5e8ddcbe | 157 | out_idx(0xea, crtc, 0x10); /* Vertical sync start */ |
1e274a58 | 158 | out_idx(0xdf, crtc, 0x12); /* Vertical display end */ |
5e8ddcbe PA |
159 | out_idx(0xe7, crtc, 0x15); /* Vertical blank start */ |
160 | out_idx(0x04, crtc, 0x16); /* Vertical blank end */ | |
161 | csel = inb(0x3cc); | |
162 | csel &= 0x0d; | |
163 | csel |= 0xe2; | |
5f641356 | 164 | outb(csel, 0x3c2); |
5e8ddcbe PA |
165 | } |
166 | ||
1e274a58 PA |
167 | static void vga_set_vertical_end(int lines) |
168 | { | |
169 | u16 crtc; /* CRTC base address */ | |
170 | u8 ovfw; /* CRTC overflow register */ | |
171 | int end = lines-1; | |
172 | ||
173 | crtc = vga_crtc(); | |
174 | ||
175 | ovfw = 0x3c | ((end >> (8-1)) & 0x02) | ((end >> (9-6)) & 0x40); | |
176 | ||
177 | out_idx(ovfw, crtc, 0x07); /* Vertical overflow */ | |
178 | out_idx(end, crtc, 0x12); /* Vertical display end */ | |
179 | } | |
180 | ||
5e8ddcbe PA |
181 | static void vga_set_80x30(void) |
182 | { | |
1e274a58 PA |
183 | vga_set_480_scanlines(); |
184 | vga_set_vertical_end(30*16); | |
5e8ddcbe PA |
185 | } |
186 | ||
187 | static void vga_set_80x34(void) | |
188 | { | |
1e274a58 | 189 | vga_set_480_scanlines(); |
5e8ddcbe | 190 | vga_set_14font(); |
1e274a58 | 191 | vga_set_vertical_end(34*14); |
5e8ddcbe PA |
192 | } |
193 | ||
194 | static void vga_set_80x60(void) | |
195 | { | |
1e274a58 | 196 | vga_set_480_scanlines(); |
5e8ddcbe | 197 | vga_set_8font(); |
1e274a58 | 198 | vga_set_vertical_end(60*8); |
5e8ddcbe PA |
199 | } |
200 | ||
201 | static int vga_set_mode(struct mode_info *mode) | |
202 | { | |
203 | /* Set the basic mode */ | |
204 | vga_set_basic_mode(); | |
205 | ||
206 | /* Override a possibly broken BIOS */ | |
207 | force_x = mode->x; | |
208 | force_y = mode->y; | |
209 | ||
210 | switch (mode->mode) { | |
211 | case VIDEO_80x25: | |
212 | break; | |
213 | case VIDEO_8POINT: | |
214 | vga_set_8font(); | |
215 | break; | |
216 | case VIDEO_80x43: | |
217 | vga_set_80x43(); | |
218 | break; | |
219 | case VIDEO_80x28: | |
220 | vga_set_14font(); | |
221 | break; | |
222 | case VIDEO_80x30: | |
223 | vga_set_80x30(); | |
224 | break; | |
225 | case VIDEO_80x34: | |
226 | vga_set_80x34(); | |
227 | break; | |
228 | case VIDEO_80x60: | |
229 | vga_set_80x60(); | |
230 | break; | |
231 | } | |
232 | ||
233 | return 0; | |
234 | } | |
235 | ||
236 | /* | |
237 | * Note: this probe includes basic information required by all | |
238 | * systems. It should be executed first, by making sure | |
239 | * video-vga.c is listed first in the Makefile. | |
240 | */ | |
241 | static int vga_probe(void) | |
242 | { | |
243 | static const char *card_name[] = { | |
244 | "CGA/MDA/HGC", "EGA", "VGA" | |
245 | }; | |
246 | static struct mode_info *mode_lists[] = { | |
247 | cga_modes, | |
248 | ega_modes, | |
249 | vga_modes, | |
250 | }; | |
251 | static int mode_count[] = { | |
252 | sizeof(cga_modes)/sizeof(struct mode_info), | |
253 | sizeof(ega_modes)/sizeof(struct mode_info), | |
254 | sizeof(vga_modes)/sizeof(struct mode_info), | |
255 | }; | |
5e8ddcbe | 256 | |
cf06de7b PA |
257 | struct biosregs ireg, oreg; |
258 | ||
259 | initregs(&ireg); | |
260 | ||
261 | ireg.ax = 0x1200; | |
262 | ireg.bl = 0x10; /* Check EGA/VGA */ | |
263 | intcall(0x10, &ireg, &oreg); | |
5e8ddcbe | 264 | |
e44b7b75 | 265 | #ifndef _WAKEUP |
cf06de7b | 266 | boot_params.screen_info.orig_video_ega_bx = oreg.bx; |
e44b7b75 PM |
267 | #endif |
268 | ||
5e8ddcbe | 269 | /* If we have MDA/CGA/HGC then BL will be unchanged at 0x10 */ |
cf06de7b | 270 | if (oreg.bl != 0x10) { |
5e8ddcbe | 271 | /* EGA/VGA */ |
cf06de7b PA |
272 | ireg.ax = 0x1a00; |
273 | intcall(0x10, &ireg, &oreg); | |
5e8ddcbe | 274 | |
cf06de7b | 275 | if (oreg.al == 0x1a) { |
5e8ddcbe | 276 | adapter = ADAPTER_VGA; |
e44b7b75 | 277 | #ifndef _WAKEUP |
5e8ddcbe | 278 | boot_params.screen_info.orig_video_isVGA = 1; |
e44b7b75 | 279 | #endif |
5e8ddcbe PA |
280 | } else { |
281 | adapter = ADAPTER_EGA; | |
282 | } | |
283 | } else { | |
284 | adapter = ADAPTER_CGA; | |
285 | } | |
286 | ||
287 | video_vga.modes = mode_lists[adapter]; | |
288 | video_vga.card_name = card_name[adapter]; | |
289 | return mode_count[adapter]; | |
290 | } | |
291 | ||
a1a00b58 | 292 | static __videocard video_vga = { |
5e8ddcbe PA |
293 | .card_name = "VGA", |
294 | .probe = vga_probe, | |
295 | .set_mode = vga_set_mode, | |
296 | }; |