1 // SPDX-License-Identifier: GPL-2.0-only 1
2 /* -*- linux-c -*- ---------------------------
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 * Copyright 2007 rPath, Inc. - All Rights R
6 * Copyright 2009 Intel Corporation; author
7 *
8 * -------------------------------------------
9
10 /*
11 * VESA text modes
12 */
13
14 #include "boot.h"
15 #include "video.h"
16 #include "vesa.h"
17 #include "string.h"
18
19 /* VESA information */
20 static struct vesa_general_info vginfo;
21 static struct vesa_mode_info vminfo;
22
23 static __videocard video_vesa;
24
25 #ifndef _WAKEUP
26 static void vesa_store_mode_params_graphics(vo
27 #else /* _WAKEUP */
28 static inline void vesa_store_mode_params_grap
29 #endif /* _WAKEUP */
30
31 static int vesa_probe(void)
32 {
33 struct biosregs ireg, oreg;
34 u16 mode;
35 addr_t mode_ptr;
36 struct mode_info *mi;
37 int nmodes = 0;
38
39 video_vesa.modes = GET_HEAP(struct mod
40
41 initregs(&ireg);
42 ireg.ax = 0x4f00;
43 ireg.di = (size_t)&vginfo;
44 intcall(0x10, &ireg, &oreg);
45
46 if (oreg.ax != 0x004f ||
47 vginfo.signature != VESA_MAGIC ||
48 vginfo.version < 0x0102)
49 return 0; /* Not present
50
51 set_fs(vginfo.video_mode_ptr.seg);
52 mode_ptr = vginfo.video_mode_ptr.off;
53
54 while ((mode = rdfs16(mode_ptr)) != 0x
55 mode_ptr += 2;
56
57 if (!heap_free(sizeof(struct m
58 break; /* Heap full,
59
60 if (mode & ~0x1ff)
61 continue;
62
63 memset(&vminfo, 0, sizeof(vmin
64
65 ireg.ax = 0x4f01;
66 ireg.cx = mode;
67 ireg.di = (size_t)&vminfo;
68 intcall(0x10, &ireg, &oreg);
69
70 if (oreg.ax != 0x004f)
71 continue;
72
73 if ((vminfo.mode_attr & 0x15)
74 /* Text Mode, TTY BIOS
75 supported by hardwa
76 mi = GET_HEAP(struct m
77 mi->mode = mode + VID
78 mi->depth = 0; /* text
79 mi->x = vminfo.h_r
80 mi->y = vminfo.v_r
81 nmodes++;
82 } else if ((vminfo.mode_attr &
83 (vminfo.memory_layo
84 vminfo.memory_layo
85 vminfo.memory_plane
86 #ifdef CONFIG_BOOT_VESA_SUPPORT
87 /* Graphics mode, colo
88 supported. Only re
89 if framebuffer is c
90 otherwise the user
91 mi = GET_HEAP(struct m
92 mi->mode = mode + VIDE
93 mi->depth = vminfo.bpp
94 mi->x = vminfo.h_res;
95 mi->y = vminfo.v_res;
96 nmodes++;
97 #endif
98 }
99 }
100
101 return nmodes;
102 }
103
104 static int vesa_set_mode(struct mode_info *mod
105 {
106 struct biosregs ireg, oreg;
107 int is_graphic;
108 u16 vesa_mode = mode->mode - VIDEO_FIR
109
110 memset(&vminfo, 0, sizeof(vminfo)); /*
111
112 initregs(&ireg);
113 ireg.ax = 0x4f01;
114 ireg.cx = vesa_mode;
115 ireg.di = (size_t)&vminfo;
116 intcall(0x10, &ireg, &oreg);
117
118 if (oreg.ax != 0x004f)
119 return -1;
120
121 if ((vminfo.mode_attr & 0x15) == 0x05)
122 /* It's a supported text mode
123 is_graphic = 0;
124 #ifdef CONFIG_BOOT_VESA_SUPPORT
125 } else if ((vminfo.mode_attr & 0x99) =
126 /* It's a graphics mode with l
127 is_graphic = 1;
128 vesa_mode |= 0x4000; /* Reques
129 #endif
130 } else {
131 return -1; /* Invalid mod
132 }
133
134
135 initregs(&ireg);
136 ireg.ax = 0x4f02;
137 ireg.bx = vesa_mode;
138 intcall(0x10, &ireg, &oreg);
139
140 if (oreg.ax != 0x004f)
141 return -1;
142
143 graphic_mode = is_graphic;
144 if (!is_graphic) {
145 /* Text mode */
146 force_x = mode->x;
147 force_y = mode->y;
148 do_restore = 1;
149 } else {
150 /* Graphics mode */
151 vesa_store_mode_params_graphic
152 }
153
154 return 0;
155 }
156
157
158 #ifndef _WAKEUP
159
160 /* Switch DAC to 8-bit mode */
161 static void vesa_dac_set_8bits(void)
162 {
163 struct biosregs ireg, oreg;
164 u8 dac_size = 6;
165
166 /* If possible, switch the DAC to 8-bi
167 if (vginfo.capabilities & 1) {
168 initregs(&ireg);
169 ireg.ax = 0x4f08;
170 ireg.bh = 0x08;
171 intcall(0x10, &ireg, &oreg);
172 if (oreg.ax == 0x004f)
173 dac_size = oreg.bh;
174 }
175
176 /* Set the color sizes to the DAC size
177 boot_params.screen_info.red_size = d
178 boot_params.screen_info.green_size = d
179 boot_params.screen_info.blue_size = d
180 boot_params.screen_info.rsvd_size = d
181
182 boot_params.screen_info.red_pos = 0
183 boot_params.screen_info.green_pos = 0
184 boot_params.screen_info.blue_pos = 0
185 boot_params.screen_info.rsvd_pos = 0
186 }
187
188 /* Save the VESA protected mode info */
189 static void vesa_store_pm_info(void)
190 {
191 struct biosregs ireg, oreg;
192
193 initregs(&ireg);
194 ireg.ax = 0x4f0a;
195 intcall(0x10, &ireg, &oreg);
196
197 if (oreg.ax != 0x004f)
198 return;
199
200 boot_params.screen_info.vesapm_seg = o
201 boot_params.screen_info.vesapm_off = o
202 }
203
204 /*
205 * Save video mode parameters for graphics mod
206 */
207 static void vesa_store_mode_params_graphics(vo
208 {
209 /* Tell the kernel we're in VESA graph
210 boot_params.screen_info.orig_video_isV
211
212 /* Mode parameters */
213 boot_params.screen_info.vesa_attribute
214 boot_params.screen_info.lfb_linelength
215 boot_params.screen_info.lfb_width = vm
216 boot_params.screen_info.lfb_height = v
217 boot_params.screen_info.lfb_depth = vm
218 boot_params.screen_info.pages = vminfo
219 boot_params.screen_info.lfb_base = vmi
220 memcpy(&boot_params.screen_info.red_si
221 &vminfo.rmask, 8);
222
223 /* General parameters */
224 boot_params.screen_info.lfb_size = vgi
225
226 if (vminfo.bpp <= 8)
227 vesa_dac_set_8bits();
228
229 vesa_store_pm_info();
230 }
231
232 /*
233 * Save EDID information for the kernel; this
234 * after mode-setting.
235 */
236 void vesa_store_edid(void)
237 {
238 #ifdef CONFIG_FIRMWARE_EDID
239 struct biosregs ireg, oreg;
240
241 /* Apparently used as a nonsense token
242 memset(&boot_params.edid_info, 0x13, s
243
244 if (vginfo.version < 0x0200)
245 return; /* EDID requir
246
247 initregs(&ireg);
248 ireg.ax = 0x4f15; /* VBE
249 /* ireg.bx = 0x0000; */ /* Rep
250 /* ireg.cx = 0; */ /* Con
251 ireg.es = 0; /* ES:
252 intcall(0x10, &ireg, &oreg);
253
254 if (oreg.ax != 0x004f)
255 return; /* No EDID */
256
257 /* BH = time in seconds to transfer ED
258 /* BL = DDC level supported */
259
260 ireg.ax = 0x4f15; /* VBE
261 ireg.bx = 0x0001; /* Rea
262 /* ireg.cx = 0; */ /* Con
263 /* ireg.dx = 0; */ /* EDI
264 ireg.es = ds();
265 ireg.di =(size_t)&boot_params.edid_inf
266 intcall(0x10, &ireg, &oreg);
267 #endif /* CONFIG_FIRMWARE_EDID */
268 }
269
270 #endif /* not _WAKEUP */
271
272 static __videocard video_vesa =
273 {
274 .card_name = "VESA",
275 .probe = vesa_probe,
276 .set_mode = vesa_set_mode,
277 .xmode_first = VIDEO_FIRST_VESA,
278 .xmode_n = 0x200,
279 };
280
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