Commit | Line | Data |
---|---|---|
5e8ddcbe PA |
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 | u8 mode; |
45 | ||
cf06de7b PA |
46 | initregs(&ireg); |
47 | ||
8e92dc76 | 48 | /* Query current mode */ |
cf3bdc29 | 49 | ireg.ax = 0x0f00; |
cf06de7b PA |
50 | intcall(0x10, &ireg, &oreg); |
51 | mode = oreg.al; | |
5e8ddcbe | 52 | |
5e8ddcbe PA |
53 | if (mode != 3 && mode != 7) |
54 | mode = 3; | |
55 | ||
56 | /* Set the mode */ | |
cf06de7b PA |
57 | ireg.ax = mode; /* AH=0: set mode */ |
58 | intcall(0x10, &ireg, NULL); | |
5e8ddcbe PA |
59 | do_restore = 1; |
60 | return mode; | |
61 | } | |
62 | ||
63 | static void vga_set_8font(void) | |
64 | { | |
65 | /* Set 8x8 font - 80x43 on EGA, 80x50 on VGA */ | |
cf06de7b PA |
66 | struct biosregs ireg; |
67 | ||
68 | initregs(&ireg); | |
5e8ddcbe PA |
69 | |
70 | /* Set 8x8 font */ | |
cf06de7b PA |
71 | ireg.ax = 0x1112; |
72 | /* ireg.bl = 0; */ | |
73 | intcall(0x10, &ireg, NULL); | |
5e8ddcbe PA |
74 | |
75 | /* Use alternate print screen */ | |
cf06de7b PA |
76 | ireg.ax = 0x1200; |
77 | ireg.bl = 0x20; | |
78 | intcall(0x10, &ireg, NULL); | |
5e8ddcbe PA |
79 | |
80 | /* Turn off cursor emulation */ | |
cf06de7b PA |
81 | ireg.ax = 0x1201; |
82 | ireg.bl = 0x34; | |
83 | intcall(0x10, &ireg, NULL); | |
5e8ddcbe PA |
84 | |
85 | /* Cursor is scan lines 6-7 */ | |
cf06de7b PA |
86 | ireg.ax = 0x0100; |
87 | ireg.cx = 0x0607; | |
88 | intcall(0x10, &ireg, NULL); | |
5e8ddcbe PA |
89 | } |
90 | ||
91 | static void vga_set_14font(void) | |
92 | { | |
93 | /* Set 9x14 font - 80x28 on VGA */ | |
cf06de7b PA |
94 | struct biosregs ireg; |
95 | ||
96 | initregs(&ireg); | |
5e8ddcbe PA |
97 | |
98 | /* Set 9x14 font */ | |
cf06de7b PA |
99 | ireg.ax = 0x1111; |
100 | /* ireg.bl = 0; */ | |
101 | intcall(0x10, &ireg, NULL); | |
5e8ddcbe PA |
102 | |
103 | /* Turn off cursor emulation */ | |
cf06de7b PA |
104 | ireg.ax = 0x1201; |
105 | ireg.bl = 0x34; | |
106 | intcall(0x10, &ireg, NULL); | |
5e8ddcbe PA |
107 | |
108 | /* Cursor is scan lines 11-12 */ | |
cf06de7b PA |
109 | ireg.ax = 0x0100; |
110 | ireg.cx = 0x0b0c; | |
111 | intcall(0x10, &ireg, NULL); | |
5e8ddcbe PA |
112 | } |
113 | ||
114 | static void vga_set_80x43(void) | |
115 | { | |
116 | /* Set 80x43 mode on VGA (not EGA) */ | |
cf06de7b PA |
117 | struct biosregs ireg; |
118 | ||
119 | initregs(&ireg); | |
5e8ddcbe PA |
120 | |
121 | /* Set 350 scans */ | |
cf06de7b PA |
122 | ireg.ax = 0x1201; |
123 | ireg.bl = 0x30; | |
124 | intcall(0x10, &ireg, NULL); | |
5e8ddcbe PA |
125 | |
126 | /* Reset video mode */ | |
cf06de7b PA |
127 | ireg.ax = 0x0003; |
128 | intcall(0x10, &ireg, NULL); | |
5e8ddcbe PA |
129 | |
130 | vga_set_8font(); | |
131 | } | |
132 | ||
133 | /* I/O address of the VGA CRTC */ | |
134 | u16 vga_crtc(void) | |
135 | { | |
136 | return (inb(0x3cc) & 1) ? 0x3d4 : 0x3b4; | |
137 | } | |
138 | ||
1e274a58 | 139 | static void vga_set_480_scanlines(void) |
5e8ddcbe | 140 | { |
5f641356 PA |
141 | u16 crtc; /* CRTC base address */ |
142 | u8 csel; /* CRTC miscellaneous output register */ | |
5e8ddcbe PA |
143 | |
144 | crtc = vga_crtc(); | |
145 | ||
146 | out_idx(0x0c, crtc, 0x11); /* Vertical sync end, unlock CR0-7 */ | |
147 | out_idx(0x0b, crtc, 0x06); /* Vertical total */ | |
1e274a58 | 148 | out_idx(0x3e, crtc, 0x07); /* Vertical overflow */ |
5e8ddcbe | 149 | out_idx(0xea, crtc, 0x10); /* Vertical sync start */ |
1e274a58 | 150 | out_idx(0xdf, crtc, 0x12); /* Vertical display end */ |
5e8ddcbe PA |
151 | out_idx(0xe7, crtc, 0x15); /* Vertical blank start */ |
152 | out_idx(0x04, crtc, 0x16); /* Vertical blank end */ | |
153 | csel = inb(0x3cc); | |
154 | csel &= 0x0d; | |
155 | csel |= 0xe2; | |
5f641356 | 156 | outb(csel, 0x3c2); |
5e8ddcbe PA |
157 | } |
158 | ||
1e274a58 PA |
159 | static void vga_set_vertical_end(int lines) |
160 | { | |
161 | u16 crtc; /* CRTC base address */ | |
162 | u8 ovfw; /* CRTC overflow register */ | |
163 | int end = lines-1; | |
164 | ||
165 | crtc = vga_crtc(); | |
166 | ||
167 | ovfw = 0x3c | ((end >> (8-1)) & 0x02) | ((end >> (9-6)) & 0x40); | |
168 | ||
169 | out_idx(ovfw, crtc, 0x07); /* Vertical overflow */ | |
170 | out_idx(end, crtc, 0x12); /* Vertical display end */ | |
171 | } | |
172 | ||
5e8ddcbe PA |
173 | static void vga_set_80x30(void) |
174 | { | |
1e274a58 PA |
175 | vga_set_480_scanlines(); |
176 | vga_set_vertical_end(30*16); | |
5e8ddcbe PA |
177 | } |
178 | ||
179 | static void vga_set_80x34(void) | |
180 | { | |
1e274a58 | 181 | vga_set_480_scanlines(); |
5e8ddcbe | 182 | vga_set_14font(); |
1e274a58 | 183 | vga_set_vertical_end(34*14); |
5e8ddcbe PA |
184 | } |
185 | ||
186 | static void vga_set_80x60(void) | |
187 | { | |
1e274a58 | 188 | vga_set_480_scanlines(); |
5e8ddcbe | 189 | vga_set_8font(); |
1e274a58 | 190 | vga_set_vertical_end(60*8); |
5e8ddcbe PA |
191 | } |
192 | ||
193 | static int vga_set_mode(struct mode_info *mode) | |
194 | { | |
195 | /* Set the basic mode */ | |
196 | vga_set_basic_mode(); | |
197 | ||
198 | /* Override a possibly broken BIOS */ | |
199 | force_x = mode->x; | |
200 | force_y = mode->y; | |
201 | ||
202 | switch (mode->mode) { | |
203 | case VIDEO_80x25: | |
204 | break; | |
205 | case VIDEO_8POINT: | |
206 | vga_set_8font(); | |
207 | break; | |
208 | case VIDEO_80x43: | |
209 | vga_set_80x43(); | |
210 | break; | |
211 | case VIDEO_80x28: | |
212 | vga_set_14font(); | |
213 | break; | |
214 | case VIDEO_80x30: | |
215 | vga_set_80x30(); | |
216 | break; | |
217 | case VIDEO_80x34: | |
218 | vga_set_80x34(); | |
219 | break; | |
220 | case VIDEO_80x60: | |
221 | vga_set_80x60(); | |
222 | break; | |
223 | } | |
224 | ||
225 | return 0; | |
226 | } | |
227 | ||
228 | /* | |
229 | * Note: this probe includes basic information required by all | |
230 | * systems. It should be executed first, by making sure | |
231 | * video-vga.c is listed first in the Makefile. | |
232 | */ | |
233 | static int vga_probe(void) | |
234 | { | |
235 | static const char *card_name[] = { | |
236 | "CGA/MDA/HGC", "EGA", "VGA" | |
237 | }; | |
238 | static struct mode_info *mode_lists[] = { | |
239 | cga_modes, | |
240 | ega_modes, | |
241 | vga_modes, | |
242 | }; | |
243 | static int mode_count[] = { | |
244 | sizeof(cga_modes)/sizeof(struct mode_info), | |
245 | sizeof(ega_modes)/sizeof(struct mode_info), | |
246 | sizeof(vga_modes)/sizeof(struct mode_info), | |
247 | }; | |
5e8ddcbe | 248 | |
cf06de7b PA |
249 | struct biosregs ireg, oreg; |
250 | ||
251 | initregs(&ireg); | |
252 | ||
253 | ireg.ax = 0x1200; | |
254 | ireg.bl = 0x10; /* Check EGA/VGA */ | |
255 | intcall(0x10, &ireg, &oreg); | |
5e8ddcbe | 256 | |
e44b7b75 | 257 | #ifndef _WAKEUP |
cf06de7b | 258 | boot_params.screen_info.orig_video_ega_bx = oreg.bx; |
e44b7b75 PM |
259 | #endif |
260 | ||
5e8ddcbe | 261 | /* If we have MDA/CGA/HGC then BL will be unchanged at 0x10 */ |
cf06de7b | 262 | if (oreg.bl != 0x10) { |
5e8ddcbe | 263 | /* EGA/VGA */ |
cf06de7b PA |
264 | ireg.ax = 0x1a00; |
265 | intcall(0x10, &ireg, &oreg); | |
5e8ddcbe | 266 | |
cf06de7b | 267 | if (oreg.al == 0x1a) { |
5e8ddcbe | 268 | adapter = ADAPTER_VGA; |
e44b7b75 | 269 | #ifndef _WAKEUP |
5e8ddcbe | 270 | boot_params.screen_info.orig_video_isVGA = 1; |
e44b7b75 | 271 | #endif |
5e8ddcbe PA |
272 | } else { |
273 | adapter = ADAPTER_EGA; | |
274 | } | |
275 | } else { | |
276 | adapter = ADAPTER_CGA; | |
277 | } | |
278 | ||
279 | video_vga.modes = mode_lists[adapter]; | |
280 | video_vga.card_name = card_name[adapter]; | |
281 | return mode_count[adapter]; | |
282 | } | |
283 | ||
a1a00b58 | 284 | static __videocard video_vga = { |
5e8ddcbe PA |
285 | .card_name = "VGA", |
286 | .probe = vga_probe, | |
287 | .set_mode = vga_set_mode, | |
288 | }; |