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H. Peter Anvin5e8ddcbe2007-07-11 12:18:52 -07001/* -*- linux-c -*- ------------------------------------------------------- *
2 *
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 * Copyright 2007 rPath, Inc. - All Rights Reserved
5 *
6 * This file is part of the Linux kernel, and is made available under
7 * the terms of the GNU General Public License version 2.
8 *
9 * ----------------------------------------------------------------------- */
10
11/*
12 * arch/i386/boot/video-vesa.c
13 *
14 * VESA text modes
15 */
16
17#include "boot.h"
18#include "video.h"
19#include "vesa.h"
20
21/* VESA information */
22static struct vesa_general_info vginfo;
23static struct vesa_mode_info vminfo;
24
25__videocard video_vesa;
26
27static void vesa_store_mode_params_graphics(void);
28
29static int vesa_probe(void)
30{
31#if defined(CONFIG_VIDEO_VESA) || defined(CONFIG_FIRMWARE_EDID)
H. Peter Anvin4221d012007-08-31 11:30:31 -070032 u16 ax, cx, di;
H. Peter Anvin5e8ddcbe2007-07-11 12:18:52 -070033 u16 mode;
34 addr_t mode_ptr;
35 struct mode_info *mi;
36 int nmodes = 0;
37
38 video_vesa.modes = GET_HEAP(struct mode_info, 0);
39
40 vginfo.signature = VBE2_MAGIC;
41
H. Peter Anvin5e8ddcbe2007-07-11 12:18:52 -070042 ax = 0x4f00;
H. Peter Anvin4221d012007-08-31 11:30:31 -070043 di = (size_t)&vginfo;
44 asm(INT10
45 : "+a" (ax), "+D" (di), "=m" (vginfo)
46 : : "ebx", "ecx", "edx", "esi");
H. Peter Anvin5e8ddcbe2007-07-11 12:18:52 -070047
48 if (ax != 0x004f ||
49 vginfo.signature != VESA_MAGIC ||
50 vginfo.version < 0x0102)
51 return 0; /* Not present */
52#endif /* CONFIG_VIDEO_VESA || CONFIG_FIRMWARE_EDID */
53#ifdef CONFIG_VIDEO_VESA
54 set_fs(vginfo.video_mode_ptr.seg);
55 mode_ptr = vginfo.video_mode_ptr.off;
56
57 while ((mode = rdfs16(mode_ptr)) != 0xffff) {
58 mode_ptr += 2;
59
H. Peter Anvine6e1ace2007-10-25 16:09:38 -070060 if (!heap_free(sizeof(struct mode_info)))
H. Peter Anvin5e8ddcbe2007-07-11 12:18:52 -070061 break; /* Heap full, can't save mode info */
62
63 if (mode & ~0x1ff)
64 continue;
65
66 memset(&vminfo, 0, sizeof vminfo); /* Just in case... */
67
68 ax = 0x4f01;
H. Peter Anvin4221d012007-08-31 11:30:31 -070069 cx = mode;
70 di = (size_t)&vminfo;
71 asm(INT10
72 : "+a" (ax), "+c" (cx), "+D" (di), "=m" (vminfo)
73 : : "ebx", "edx", "esi");
H. Peter Anvin5e8ddcbe2007-07-11 12:18:52 -070074
75 if (ax != 0x004f)
76 continue;
77
78 if ((vminfo.mode_attr & 0x15) == 0x05) {
79 /* Text Mode, TTY BIOS supported,
80 supported by hardware */
81 mi = GET_HEAP(struct mode_info, 1);
H. Peter Anvin1cac5002008-01-30 13:33:02 +010082 mi->mode = mode + VIDEO_FIRST_VESA;
83 mi->depth = 0; /* text */
84 mi->x = vminfo.h_res;
85 mi->y = vminfo.v_res;
H. Peter Anvin5e8ddcbe2007-07-11 12:18:52 -070086 nmodes++;
H. Peter Anvin1cac5002008-01-30 13:33:02 +010087 } else if ((vminfo.mode_attr & 0x99) == 0x99 &&
88 (vminfo.memory_layout == 4 ||
89 vminfo.memory_layout == 6) &&
90 vminfo.memory_planes == 1) {
H. Peter Anvin5e8ddcbe2007-07-11 12:18:52 -070091#ifdef CONFIG_FB
92 /* Graphics mode, color, linear frame buffer
H. Peter Anvin1cac5002008-01-30 13:33:02 +010093 supported. Only register the mode if
94 if framebuffer is configured, however,
95 otherwise the user will be left without a screen.
96 We don't require CONFIG_FB_VESA, however, since
97 some of the other framebuffer drivers can use
98 this mode-setting, too. */
H. Peter Anvin5e8ddcbe2007-07-11 12:18:52 -070099 mi = GET_HEAP(struct mode_info, 1);
100 mi->mode = mode + VIDEO_FIRST_VESA;
H. Peter Anvin1cac5002008-01-30 13:33:02 +0100101 mi->depth = vminfo.bpp;
102 mi->x = vminfo.h_res;
103 mi->y = vminfo.v_res;
H. Peter Anvin5e8ddcbe2007-07-11 12:18:52 -0700104 nmodes++;
105#endif
106 }
107 }
108
109 return nmodes;
110#else
111 return 0;
112#endif /* CONFIG_VIDEO_VESA */
113}
114
115static int vesa_set_mode(struct mode_info *mode)
116{
H. Peter Anvin4221d012007-08-31 11:30:31 -0700117 u16 ax, bx, cx, di;
H. Peter Anvin5e8ddcbe2007-07-11 12:18:52 -0700118 int is_graphic;
119 u16 vesa_mode = mode->mode - VIDEO_FIRST_VESA;
120
121 memset(&vminfo, 0, sizeof vminfo); /* Just in case... */
122
123 ax = 0x4f01;
H. Peter Anvin4221d012007-08-31 11:30:31 -0700124 cx = vesa_mode;
125 di = (size_t)&vminfo;
126 asm(INT10
127 : "+a" (ax), "+c" (cx), "+D" (di), "=m" (vminfo)
128 : : "ebx", "edx", "esi");
H. Peter Anvin5e8ddcbe2007-07-11 12:18:52 -0700129
130 if (ax != 0x004f)
131 return -1;
132
133 if ((vminfo.mode_attr & 0x15) == 0x05) {
134 /* It's a supported text mode */
135 is_graphic = 0;
136 } else if ((vminfo.mode_attr & 0x99) == 0x99) {
137 /* It's a graphics mode with linear frame buffer */
138 is_graphic = 1;
139 vesa_mode |= 0x4000; /* Request linear frame buffer */
140 } else {
141 return -1; /* Invalid mode */
142 }
143
144
145 ax = 0x4f02;
H. Peter Anvin4221d012007-08-31 11:30:31 -0700146 bx = vesa_mode;
147 di = 0;
148 asm volatile(INT10
149 : "+a" (ax), "+b" (bx), "+D" (di)
150 : : "ecx", "edx", "esi");
H. Peter Anvin5e8ddcbe2007-07-11 12:18:52 -0700151
152 if (ax != 0x004f)
153 return -1;
154
155 graphic_mode = is_graphic;
156 if (!is_graphic) {
157 /* Text mode */
158 force_x = mode->x;
159 force_y = mode->y;
160 do_restore = 1;
161 } else {
162 /* Graphics mode */
163 vesa_store_mode_params_graphics();
164 }
165
166 return 0;
167}
168
169
170/* Switch DAC to 8-bit mode */
171static void vesa_dac_set_8bits(void)
172{
173 u8 dac_size = 6;
174
175 /* If possible, switch the DAC to 8-bit mode */
176 if (vginfo.capabilities & 1) {
177 u16 ax, bx;
178
179 ax = 0x4f08;
180 bx = 0x0800;
181 asm volatile(INT10
182 : "+a" (ax), "+b" (bx)
183 : : "ecx", "edx", "esi", "edi");
184
185 if (ax == 0x004f)
186 dac_size = bx >> 8;
187 }
188
189 /* Set the color sizes to the DAC size, and offsets to 0 */
190 boot_params.screen_info.red_size = dac_size;
191 boot_params.screen_info.green_size = dac_size;
192 boot_params.screen_info.blue_size = dac_size;
193 boot_params.screen_info.rsvd_size = dac_size;
194
195 boot_params.screen_info.red_pos = 0;
196 boot_params.screen_info.green_pos = 0;
197 boot_params.screen_info.blue_pos = 0;
198 boot_params.screen_info.rsvd_pos = 0;
199}
200
201/* Save the VESA protected mode info */
202static void vesa_store_pm_info(void)
203{
204 u16 ax, bx, di, es;
205
206 ax = 0x4f0a;
207 bx = di = 0;
208 asm("pushw %%es; "INT10"; movw %%es,%0; popw %%es"
209 : "=d" (es), "+a" (ax), "+b" (bx), "+D" (di)
210 : : "ecx", "esi");
211
212 if (ax != 0x004f)
213 return;
214
215 boot_params.screen_info.vesapm_seg = es;
216 boot_params.screen_info.vesapm_off = di;
217}
218
219/*
220 * Save video mode parameters for graphics mode
221 */
222static void vesa_store_mode_params_graphics(void)
223{
224 /* Tell the kernel we're in VESA graphics mode */
225 boot_params.screen_info.orig_video_isVGA = 0x23;
226
227 /* Mode parameters */
228 boot_params.screen_info.vesa_attributes = vminfo.mode_attr;
229 boot_params.screen_info.lfb_linelength = vminfo.logical_scan;
230 boot_params.screen_info.lfb_width = vminfo.h_res;
231 boot_params.screen_info.lfb_height = vminfo.v_res;
232 boot_params.screen_info.lfb_depth = vminfo.bpp;
233 boot_params.screen_info.pages = vminfo.image_planes;
234 boot_params.screen_info.lfb_base = vminfo.lfb_ptr;
235 memcpy(&boot_params.screen_info.red_size,
236 &vminfo.rmask, 8);
237
238 /* General parameters */
239 boot_params.screen_info.lfb_size = vginfo.total_memory;
240
241 if (vminfo.bpp <= 8)
242 vesa_dac_set_8bits();
243
244 vesa_store_pm_info();
245}
246
247/*
248 * Save EDID information for the kernel; this is invoked, separately,
249 * after mode-setting.
250 */
251void vesa_store_edid(void)
252{
253#ifdef CONFIG_FIRMWARE_EDID
254 u16 ax, bx, cx, dx, di;
255
256 /* Apparently used as a nonsense token... */
257 memset(&boot_params.edid_info, 0x13, sizeof boot_params.edid_info);
258
259 if (vginfo.version < 0x0200)
260 return; /* EDID requires VBE 2.0+ */
261
262 ax = 0x4f15; /* VBE DDC */
263 bx = 0x0000; /* Report DDC capabilities */
264 cx = 0; /* Controller 0 */
265 di = 0; /* ES:DI must be 0 by spec */
266
267 /* Note: The VBE DDC spec is different from the main VESA spec;
268 we genuinely have to assume all registers are destroyed here. */
269
270 asm("pushw %%es; movw %2,%%es; "INT10"; popw %%es"
271 : "+a" (ax), "+b" (bx)
272 : "c" (cx), "D" (di)
273 : "esi");
274
275 if (ax != 0x004f)
276 return; /* No EDID */
277
278 /* BH = time in seconds to transfer EDD information */
279 /* BL = DDC level supported */
280
281 ax = 0x4f15; /* VBE DDC */
282 bx = 0x0001; /* Read EDID */
283 cx = 0; /* Controller 0 */
284 dx = 0; /* EDID block number */
285 di =(size_t) &boot_params.edid_info; /* (ES:)Pointer to block */
286 asm(INT10
Antonino A. Daplas59acc082007-08-02 18:16:46 +0800287 : "+a" (ax), "+b" (bx), "+d" (dx), "=m" (boot_params.edid_info)
H. Peter Anvin5e8ddcbe2007-07-11 12:18:52 -0700288 : "c" (cx), "D" (di)
289 : "esi");
290#endif /* CONFIG_FIRMWARE_EDID */
291}
292
293__videocard video_vesa =
294{
295 .card_name = "VESA",
296 .probe = vesa_probe,
297 .set_mode = vesa_set_mode,
298 .xmode_first = VIDEO_FIRST_VESA,
299 .xmode_n = 0x200,
300};