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1/* -*- linux-c -*- ------------------------------------------------------- *
2 *
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 * Copyright 2007 rPath, Inc. - All Rights Reserved
5 * Copyright 2009 Intel Corporation; author H. Peter Anvin
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/*
13 * VESA text modes
14 */
15
16#include "boot.h"
17#include "video.h"
18#include "vesa.h"
19
20/* VESA information */
21static struct vesa_general_info vginfo;
22static struct vesa_mode_info vminfo;
23
24static __videocard video_vesa;
25
26#ifndef _WAKEUP
27static void vesa_store_mode_params_graphics(void);
28#else /* _WAKEUP */
29static inline void vesa_store_mode_params_graphics(void) {}
30#endif /* _WAKEUP */
31
32static int vesa_probe(void)
33{
34 struct biosregs ireg, oreg;
35 u16 mode;
36 addr_t mode_ptr;
37 struct mode_info *mi;
38 int nmodes = 0;
39
40 video_vesa.modes = GET_HEAP(struct mode_info, 0);
41
42 initregs(&ireg);
43 ireg.ax = 0x4f00;
44 ireg.di = (size_t)&vginfo;
45 intcall(0x10, &ireg, &oreg);
46
47 if (oreg.ax != 0x004f ||
48 vginfo.signature != VESA_MAGIC ||
49 vginfo.version < 0x0102)
50 return 0; /* Not present */
51
52 set_fs(vginfo.video_mode_ptr.seg);
53 mode_ptr = vginfo.video_mode_ptr.off;
54
55 while ((mode = rdfs16(mode_ptr)) != 0xffff) {
56 mode_ptr += 2;
57
58 if (!heap_free(sizeof(struct mode_info)))
59 break; /* Heap full, can't save mode info */
60
61 if (mode & ~0x1ff)
62 continue;
63
64 memset(&vminfo, 0, sizeof vminfo); /* Just in case... */
65
66 ireg.ax = 0x4f01;
67 ireg.cx = mode;
68 ireg.di = (size_t)&vminfo;
69 intcall(0x10, &ireg, &oreg);
70
71 if (oreg.ax != 0x004f)
72 continue;
73
74 if ((vminfo.mode_attr & 0x15) == 0x05) {
75 /* Text Mode, TTY BIOS supported,
76 supported by hardware */
77 mi = GET_HEAP(struct mode_info, 1);
78 mi->mode = mode + VIDEO_FIRST_VESA;
79 mi->depth = 0; /* text */
80 mi->x = vminfo.h_res;
81 mi->y = vminfo.v_res;
82 nmodes++;
83 } else if ((vminfo.mode_attr & 0x99) == 0x99 &&
84 (vminfo.memory_layout == 4 ||
85 vminfo.memory_layout == 6) &&
86 vminfo.memory_planes == 1) {
87#ifdef CONFIG_FB_BOOT_VESA_SUPPORT
88 /* Graphics mode, color, linear frame buffer
89 supported. Only register the mode if
90 if framebuffer is configured, however,
91 otherwise the user will be left without a screen. */
92 mi = GET_HEAP(struct mode_info, 1);
93 mi->mode = mode + VIDEO_FIRST_VESA;
94 mi->depth = vminfo.bpp;
95 mi->x = vminfo.h_res;
96 mi->y = vminfo.v_res;
97 nmodes++;
98#endif
99 }
100 }
101
102 return nmodes;
103}
104
105static int vesa_set_mode(struct mode_info *mode)
106{
107 struct biosregs ireg, oreg;
108 int is_graphic;
109 u16 vesa_mode = mode->mode - VIDEO_FIRST_VESA;
110
111 memset(&vminfo, 0, sizeof vminfo); /* Just in case... */
112
113 initregs(&ireg);
114 ireg.ax = 0x4f01;
115 ireg.cx = vesa_mode;
116 ireg.di = (size_t)&vminfo;
117 intcall(0x10, &ireg, &oreg);
118
119 if (oreg.ax != 0x004f)
120 return -1;
121
122 if ((vminfo.mode_attr & 0x15) == 0x05) {
123 /* It's a supported text mode */
124 is_graphic = 0;
125#ifdef CONFIG_FB_BOOT_VESA_SUPPORT
126 } else if ((vminfo.mode_attr & 0x99) == 0x99) {
127 /* It's a graphics mode with linear frame buffer */
128 is_graphic = 1;
129 vesa_mode |= 0x4000; /* Request linear frame buffer */
130#endif
131 } else {
132 return -1; /* Invalid mode */
133 }
134
135
136 initregs(&ireg);
137 ireg.ax = 0x4f02;
138 ireg.bx = vesa_mode;
139 intcall(0x10, &ireg, &oreg);
140
141 if (oreg.ax != 0x004f)
142 return -1;
143
144 graphic_mode = is_graphic;
145 if (!is_graphic) {
146 /* Text mode */
147 force_x = mode->x;
148 force_y = mode->y;
149 do_restore = 1;
150 } else {
151 /* Graphics mode */
152 vesa_store_mode_params_graphics();
153 }
154
155 return 0;
156}
157
158
159#ifndef _WAKEUP
160
161/* Switch DAC to 8-bit mode */
162static void vesa_dac_set_8bits(void)
163{
164 struct biosregs ireg, oreg;
165 u8 dac_size = 6;
166
167 /* If possible, switch the DAC to 8-bit mode */
168 if (vginfo.capabilities & 1) {
169 initregs(&ireg);
170 ireg.ax = 0x4f08;
171 ireg.bh = 0x08;
172 intcall(0x10, &ireg, &oreg);
173 if (oreg.ax == 0x004f)
174 dac_size = oreg.bh;
175 }
176
177 /* Set the color sizes to the DAC size, and offsets to 0 */
178 boot_params.screen_info.red_size = dac_size;
179 boot_params.screen_info.green_size = dac_size;
180 boot_params.screen_info.blue_size = dac_size;
181 boot_params.screen_info.rsvd_size = dac_size;
182
183 boot_params.screen_info.red_pos = 0;
184 boot_params.screen_info.green_pos = 0;
185 boot_params.screen_info.blue_pos = 0;
186 boot_params.screen_info.rsvd_pos = 0;
187}
188
189/* Save the VESA protected mode info */
190static void vesa_store_pm_info(void)
191{
192 struct biosregs ireg, oreg;
193
194 initregs(&ireg);
195 ireg.ax = 0x4f0a;
196 intcall(0x10, &ireg, &oreg);
197
198 if (oreg.ax != 0x004f)
199 return;
200
201 boot_params.screen_info.vesapm_seg = oreg.es;
202 boot_params.screen_info.vesapm_off = oreg.di;
203}
204
205/*
206 * Save video mode parameters for graphics mode
207 */
208static void vesa_store_mode_params_graphics(void)
209{
210 /* Tell the kernel we're in VESA graphics mode */
211 boot_params.screen_info.orig_video_isVGA = VIDEO_TYPE_VLFB;
212
213 /* Mode parameters */
214 boot_params.screen_info.vesa_attributes = vminfo.mode_attr;
215 boot_params.screen_info.lfb_linelength = vminfo.logical_scan;
216 boot_params.screen_info.lfb_width = vminfo.h_res;
217 boot_params.screen_info.lfb_height = vminfo.v_res;
218 boot_params.screen_info.lfb_depth = vminfo.bpp;
219 boot_params.screen_info.pages = vminfo.image_planes;
220 boot_params.screen_info.lfb_base = vminfo.lfb_ptr;
221 memcpy(&boot_params.screen_info.red_size,
222 &vminfo.rmask, 8);
223
224 /* General parameters */
225 boot_params.screen_info.lfb_size = vginfo.total_memory;
226
227 if (vminfo.bpp <= 8)
228 vesa_dac_set_8bits();
229
230 vesa_store_pm_info();
231}
232
233/*
234 * Save EDID information for the kernel; this is invoked, separately,
235 * after mode-setting.
236 */
237void vesa_store_edid(void)
238{
239#ifdef CONFIG_FIRMWARE_EDID
240 struct biosregs ireg, oreg;
241
242 /* Apparently used as a nonsense token... */
243 memset(&boot_params.edid_info, 0x13, sizeof boot_params.edid_info);
244
245 if (vginfo.version < 0x0200)
246 return; /* EDID requires VBE 2.0+ */
247
248 initregs(&ireg);
249 ireg.ax = 0x4f15; /* VBE DDC */
250 /* ireg.bx = 0x0000; */ /* Report DDC capabilities */
251 /* ireg.cx = 0; */ /* Controller 0 */
252 ireg.es = 0; /* ES:DI must be 0 by spec */
253 intcall(0x10, &ireg, &oreg);
254
255 if (oreg.ax != 0x004f)
256 return; /* No EDID */
257
258 /* BH = time in seconds to transfer EDD information */
259 /* BL = DDC level supported */
260
261 ireg.ax = 0x4f15; /* VBE DDC */
262 ireg.bx = 0x0001; /* Read EDID */
263 /* ireg.cx = 0; */ /* Controller 0 */
264 /* ireg.dx = 0; */ /* EDID block number */
265 ireg.es = ds();
266 ireg.di =(size_t)&boot_params.edid_info; /* (ES:)Pointer to block */
267 intcall(0x10, &ireg, &oreg);
268#endif /* CONFIG_FIRMWARE_EDID */
269}
270
271#endif /* not _WAKEUP */
272
273static __videocard video_vesa =
274{
275 .card_name = "VESA",
276 .probe = vesa_probe,
277 .set_mode = vesa_set_mode,
278 .xmode_first = VIDEO_FIRST_VESA,
279 .xmode_n = 0x200,
280};
1/* -*- linux-c -*- ------------------------------------------------------- *
2 *
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 * Copyright 2007 rPath, Inc. - All Rights Reserved
5 * Copyright 2009 Intel Corporation; author H. Peter Anvin
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/*
13 * VESA text modes
14 */
15
16#include "boot.h"
17#include "video.h"
18#include "vesa.h"
19#include "string.h"
20
21/* VESA information */
22static struct vesa_general_info vginfo;
23static struct vesa_mode_info vminfo;
24
25static __videocard video_vesa;
26
27#ifndef _WAKEUP
28static void vesa_store_mode_params_graphics(void);
29#else /* _WAKEUP */
30static inline void vesa_store_mode_params_graphics(void) {}
31#endif /* _WAKEUP */
32
33static int vesa_probe(void)
34{
35 struct biosregs ireg, oreg;
36 u16 mode;
37 addr_t mode_ptr;
38 struct mode_info *mi;
39 int nmodes = 0;
40
41 video_vesa.modes = GET_HEAP(struct mode_info, 0);
42
43 initregs(&ireg);
44 ireg.ax = 0x4f00;
45 ireg.di = (size_t)&vginfo;
46 intcall(0x10, &ireg, &oreg);
47
48 if (oreg.ax != 0x004f ||
49 vginfo.signature != VESA_MAGIC ||
50 vginfo.version < 0x0102)
51 return 0; /* Not present */
52
53 set_fs(vginfo.video_mode_ptr.seg);
54 mode_ptr = vginfo.video_mode_ptr.off;
55
56 while ((mode = rdfs16(mode_ptr)) != 0xffff) {
57 mode_ptr += 2;
58
59 if (!heap_free(sizeof(struct mode_info)))
60 break; /* Heap full, can't save mode info */
61
62 if (mode & ~0x1ff)
63 continue;
64
65 memset(&vminfo, 0, sizeof vminfo); /* Just in case... */
66
67 ireg.ax = 0x4f01;
68 ireg.cx = mode;
69 ireg.di = (size_t)&vminfo;
70 intcall(0x10, &ireg, &oreg);
71
72 if (oreg.ax != 0x004f)
73 continue;
74
75 if ((vminfo.mode_attr & 0x15) == 0x05) {
76 /* Text Mode, TTY BIOS supported,
77 supported by hardware */
78 mi = GET_HEAP(struct mode_info, 1);
79 mi->mode = mode + VIDEO_FIRST_VESA;
80 mi->depth = 0; /* text */
81 mi->x = vminfo.h_res;
82 mi->y = vminfo.v_res;
83 nmodes++;
84 } else if ((vminfo.mode_attr & 0x99) == 0x99 &&
85 (vminfo.memory_layout == 4 ||
86 vminfo.memory_layout == 6) &&
87 vminfo.memory_planes == 1) {
88#ifdef CONFIG_FB_BOOT_VESA_SUPPORT
89 /* Graphics mode, color, linear frame buffer
90 supported. Only register the mode if
91 if framebuffer is configured, however,
92 otherwise the user will be left without a screen. */
93 mi = GET_HEAP(struct mode_info, 1);
94 mi->mode = mode + VIDEO_FIRST_VESA;
95 mi->depth = vminfo.bpp;
96 mi->x = vminfo.h_res;
97 mi->y = vminfo.v_res;
98 nmodes++;
99#endif
100 }
101 }
102
103 return nmodes;
104}
105
106static int vesa_set_mode(struct mode_info *mode)
107{
108 struct biosregs ireg, oreg;
109 int is_graphic;
110 u16 vesa_mode = mode->mode - VIDEO_FIRST_VESA;
111
112 memset(&vminfo, 0, sizeof vminfo); /* Just in case... */
113
114 initregs(&ireg);
115 ireg.ax = 0x4f01;
116 ireg.cx = vesa_mode;
117 ireg.di = (size_t)&vminfo;
118 intcall(0x10, &ireg, &oreg);
119
120 if (oreg.ax != 0x004f)
121 return -1;
122
123 if ((vminfo.mode_attr & 0x15) == 0x05) {
124 /* It's a supported text mode */
125 is_graphic = 0;
126#ifdef CONFIG_FB_BOOT_VESA_SUPPORT
127 } else if ((vminfo.mode_attr & 0x99) == 0x99) {
128 /* It's a graphics mode with linear frame buffer */
129 is_graphic = 1;
130 vesa_mode |= 0x4000; /* Request linear frame buffer */
131#endif
132 } else {
133 return -1; /* Invalid mode */
134 }
135
136
137 initregs(&ireg);
138 ireg.ax = 0x4f02;
139 ireg.bx = vesa_mode;
140 intcall(0x10, &ireg, &oreg);
141
142 if (oreg.ax != 0x004f)
143 return -1;
144
145 graphic_mode = is_graphic;
146 if (!is_graphic) {
147 /* Text mode */
148 force_x = mode->x;
149 force_y = mode->y;
150 do_restore = 1;
151 } else {
152 /* Graphics mode */
153 vesa_store_mode_params_graphics();
154 }
155
156 return 0;
157}
158
159
160#ifndef _WAKEUP
161
162/* Switch DAC to 8-bit mode */
163static void vesa_dac_set_8bits(void)
164{
165 struct biosregs ireg, oreg;
166 u8 dac_size = 6;
167
168 /* If possible, switch the DAC to 8-bit mode */
169 if (vginfo.capabilities & 1) {
170 initregs(&ireg);
171 ireg.ax = 0x4f08;
172 ireg.bh = 0x08;
173 intcall(0x10, &ireg, &oreg);
174 if (oreg.ax == 0x004f)
175 dac_size = oreg.bh;
176 }
177
178 /* Set the color sizes to the DAC size, and offsets to 0 */
179 boot_params.screen_info.red_size = dac_size;
180 boot_params.screen_info.green_size = dac_size;
181 boot_params.screen_info.blue_size = dac_size;
182 boot_params.screen_info.rsvd_size = dac_size;
183
184 boot_params.screen_info.red_pos = 0;
185 boot_params.screen_info.green_pos = 0;
186 boot_params.screen_info.blue_pos = 0;
187 boot_params.screen_info.rsvd_pos = 0;
188}
189
190/* Save the VESA protected mode info */
191static void vesa_store_pm_info(void)
192{
193 struct biosregs ireg, oreg;
194
195 initregs(&ireg);
196 ireg.ax = 0x4f0a;
197 intcall(0x10, &ireg, &oreg);
198
199 if (oreg.ax != 0x004f)
200 return;
201
202 boot_params.screen_info.vesapm_seg = oreg.es;
203 boot_params.screen_info.vesapm_off = oreg.di;
204}
205
206/*
207 * Save video mode parameters for graphics mode
208 */
209static void vesa_store_mode_params_graphics(void)
210{
211 /* Tell the kernel we're in VESA graphics mode */
212 boot_params.screen_info.orig_video_isVGA = VIDEO_TYPE_VLFB;
213
214 /* Mode parameters */
215 boot_params.screen_info.vesa_attributes = vminfo.mode_attr;
216 boot_params.screen_info.lfb_linelength = vminfo.logical_scan;
217 boot_params.screen_info.lfb_width = vminfo.h_res;
218 boot_params.screen_info.lfb_height = vminfo.v_res;
219 boot_params.screen_info.lfb_depth = vminfo.bpp;
220 boot_params.screen_info.pages = vminfo.image_planes;
221 boot_params.screen_info.lfb_base = vminfo.lfb_ptr;
222 memcpy(&boot_params.screen_info.red_size,
223 &vminfo.rmask, 8);
224
225 /* General parameters */
226 boot_params.screen_info.lfb_size = vginfo.total_memory;
227
228 if (vminfo.bpp <= 8)
229 vesa_dac_set_8bits();
230
231 vesa_store_pm_info();
232}
233
234/*
235 * Save EDID information for the kernel; this is invoked, separately,
236 * after mode-setting.
237 */
238void vesa_store_edid(void)
239{
240#ifdef CONFIG_FIRMWARE_EDID
241 struct biosregs ireg, oreg;
242
243 /* Apparently used as a nonsense token... */
244 memset(&boot_params.edid_info, 0x13, sizeof boot_params.edid_info);
245
246 if (vginfo.version < 0x0200)
247 return; /* EDID requires VBE 2.0+ */
248
249 initregs(&ireg);
250 ireg.ax = 0x4f15; /* VBE DDC */
251 /* ireg.bx = 0x0000; */ /* Report DDC capabilities */
252 /* ireg.cx = 0; */ /* Controller 0 */
253 ireg.es = 0; /* ES:DI must be 0 by spec */
254 intcall(0x10, &ireg, &oreg);
255
256 if (oreg.ax != 0x004f)
257 return; /* No EDID */
258
259 /* BH = time in seconds to transfer EDD information */
260 /* BL = DDC level supported */
261
262 ireg.ax = 0x4f15; /* VBE DDC */
263 ireg.bx = 0x0001; /* Read EDID */
264 /* ireg.cx = 0; */ /* Controller 0 */
265 /* ireg.dx = 0; */ /* EDID block number */
266 ireg.es = ds();
267 ireg.di =(size_t)&boot_params.edid_info; /* (ES:)Pointer to block */
268 intcall(0x10, &ireg, &oreg);
269#endif /* CONFIG_FIRMWARE_EDID */
270}
271
272#endif /* not _WAKEUP */
273
274static __videocard video_vesa =
275{
276 .card_name = "VESA",
277 .probe = vesa_probe,
278 .set_mode = vesa_set_mode,
279 .xmode_first = VIDEO_FIRST_VESA,
280 .xmode_n = 0x200,
281};