| 1 | #if defined (BIOS) |
| 2 | |
| 3 | #include <stddef.h> |
| 4 | #include <stdint.h> |
| 5 | #include <stdbool.h> |
| 6 | #include <drivers/vbe.h> |
| 7 | #include <drivers/edid.h> |
| 8 | #include <lib/libc.h> |
| 9 | #include <lib/misc.h> |
| 10 | #include <lib/real.h> |
| 11 | #include <lib/print.h> |
| 12 | #include <lib/image.h> |
| 13 | #include <lib/config.h> |
| 14 | #include <lib/uri.h> |
| 15 | #include <lib/term.h> |
| 16 | #include <mm/pmm.h> |
| 17 | |
| 18 | struct vbe_info_struct { |
| 19 | char signature[4]; |
| 20 | uint8_t version_min; |
| 21 | uint8_t version_maj; |
| 22 | uint16_t oem_off; |
| 23 | uint16_t oem_seg; |
| 24 | uint32_t capabilities; |
| 25 | uint16_t vid_modes_off; |
| 26 | uint16_t vid_modes_seg; |
| 27 | uint16_t vid_mem_blocks; |
| 28 | uint16_t software_rev; |
| 29 | uint16_t vendor_off; |
| 30 | uint16_t vendor_seg; |
| 31 | uint16_t prod_name_off; |
| 32 | uint16_t prod_name_seg; |
| 33 | uint16_t prod_rev_off; |
| 34 | uint16_t prod_rev_seg; |
| 35 | uint8_t reserved[222]; |
| 36 | uint8_t oem_data[256]; |
| 37 | } __attribute__((packed)); |
| 38 | |
| 39 | struct vbe_mode_info_struct { |
| 40 | uint16_t mode_attributes; |
| 41 | uint8_t wina_attributes; |
| 42 | uint8_t winb_attributes; |
| 43 | uint16_t win_granularity; |
| 44 | uint16_t win_size; |
| 45 | uint16_t wina_segment; |
| 46 | uint16_t winb_segment; |
| 47 | uint32_t win_farptr; |
| 48 | uint16_t bytes_per_scanline; |
| 49 | |
| 50 | uint16_t res_x; |
| 51 | uint16_t res_y; |
| 52 | uint8_t charsize_x; |
| 53 | uint8_t charsize_y; |
| 54 | uint8_t plane_count; |
| 55 | uint8_t bpp; |
| 56 | uint8_t bank_count; |
| 57 | uint8_t memory_model; |
| 58 | uint8_t bank_size; |
| 59 | uint8_t image_count; |
| 60 | uint8_t reserved0; |
| 61 | |
| 62 | uint8_t red_mask_size; |
| 63 | uint8_t red_mask_shift; |
| 64 | uint8_t green_mask_size; |
| 65 | uint8_t green_mask_shift; |
| 66 | uint8_t blue_mask_size; |
| 67 | uint8_t blue_mask_shift; |
| 68 | uint8_t rsvd_mask_size; |
| 69 | uint8_t rsvd_mask_shift; |
| 70 | uint8_t direct_color_info; |
| 71 | |
| 72 | uint32_t framebuffer_addr; |
| 73 | uint8_t reserved1[6]; |
| 74 | |
| 75 | uint16_t lin_bytes_per_scanline; |
| 76 | uint8_t banked_image_count; |
| 77 | uint8_t lin_image_count; |
| 78 | uint8_t lin_red_mask_size; |
| 79 | uint8_t lin_red_mask_shift; |
| 80 | uint8_t lin_green_mask_size; |
| 81 | uint8_t lin_green_mask_shift; |
| 82 | uint8_t lin_blue_mask_size; |
| 83 | uint8_t lin_blue_mask_shift; |
| 84 | uint8_t lin_rsvd_mask_size; |
| 85 | uint8_t lin_rsvd_mask_shift; |
| 86 | uint32_t max_pixel_clock; |
| 87 | |
| 88 | uint8_t reserved2[190]; |
| 89 | } __attribute__((packed)); |
| 90 | |
| 91 | static bool get_vbe_info(struct vbe_info_struct *buf) { |
| 92 | struct rm_regs r = {0}; |
| 93 | |
| 94 | r.eax = 0x4f00; |
| 95 | r.edi = (uint32_t)buf; |
| 96 | rm_int(0x10, &r, &r); |
| 97 | |
| 98 | if ((r.eax & 0xff00) >> 8 != 0 |
| 99 | || (r.eax & 0x00ff) != 0x4f) { |
| 100 | return false; |
| 101 | } |
| 102 | |
| 103 | return true; |
| 104 | } |
| 105 | |
| 106 | static bool get_vbe_mode_info(struct vbe_mode_info_struct *buf, |
| 107 | uint16_t mode) { |
| 108 | struct rm_regs r = {0}; |
| 109 | |
| 110 | r.eax = 0x4f01; |
| 111 | r.ecx = (uint32_t)mode; |
| 112 | r.edi = (uint32_t)buf; |
| 113 | rm_int(0x10, &r, &r); |
| 114 | |
| 115 | if ((r.eax & 0xff00) >> 8 != 0 |
| 116 | || (r.eax & 0x00ff) != 0x4f) { |
| 117 | return false; |
| 118 | } |
| 119 | |
| 120 | return true; |
| 121 | } |
| 122 | |
| 123 | static bool set_vbe_mode(uint16_t mode) { |
| 124 | struct rm_regs r = {0}; |
| 125 | |
| 126 | r.eax = 0x4f02; |
| 127 | r.ebx = (uint32_t)mode | (1 << 14); |
| 128 | rm_int(0x10, &r, &r); |
| 129 | |
| 130 | if ((r.eax & 0xff00) >> 8 != 0 |
| 131 | || (r.eax & 0x00ff) != 0x4f) { |
| 132 | return false; |
| 133 | } |
| 134 | |
| 135 | return true; |
| 136 | } |
| 137 | |
| 138 | // Maximum number of video modes to enumerate to prevent infinite loops |
| 139 | // from corrupted VBE mode lists without a proper 0xffff terminator |
| 140 | #define VBE_MAX_MODES 512 |
| 141 | |
| 142 | struct fb_info *vbe_get_mode_list(size_t *count) { |
| 143 | struct vbe_info_struct vbe_info; |
| 144 | if (!get_vbe_info(&vbe_info)) { |
| 145 | return NULL; |
| 146 | } |
| 147 | |
| 148 | uint16_t *vid_modes = (uint16_t *)rm_desegment(vbe_info.vid_modes_seg, |
| 149 | vbe_info.vid_modes_off); |
| 150 | |
| 151 | size_t modes_count = 0; |
| 152 | for (size_t i = 0; i < VBE_MAX_MODES && vid_modes[i] != 0xffff; i++) { |
| 153 | struct vbe_mode_info_struct vbe_mode_info; |
| 154 | if (!get_vbe_mode_info(&vbe_mode_info, vid_modes[i])) { |
| 155 | continue; |
| 156 | } |
| 157 | |
| 158 | // We only support RGB for now |
| 159 | if (vbe_mode_info.memory_model != 0x06) |
| 160 | continue; |
| 161 | // We only support linear modes |
| 162 | if (!(vbe_mode_info.mode_attributes & (1 << 7))) |
| 163 | continue; |
| 164 | |
| 165 | uint16_t pitch = (vbe_info.version_maj < 3) |
| 166 | ? vbe_mode_info.bytes_per_scanline |
| 167 | : vbe_mode_info.lin_bytes_per_scanline; |
| 168 | uint16_t bytes_per_pixel = vbe_mode_info.bpp / 8; |
| 169 | if (bytes_per_pixel == 0 |
| 170 | || pitch % bytes_per_pixel != 0 |
| 171 | || pitch < (uint32_t)vbe_mode_info.res_x * bytes_per_pixel) |
| 172 | continue; |
| 173 | |
| 174 | modes_count++; |
| 175 | } |
| 176 | |
| 177 | struct fb_info *ret = ext_mem_alloc_counted(modes_count, sizeof(struct fb_info)); |
| 178 | |
| 179 | for (size_t i = 0, j = 0; i < VBE_MAX_MODES && vid_modes[i] != 0xffff; i++) { |
| 180 | struct vbe_mode_info_struct vbe_mode_info; |
| 181 | if (!get_vbe_mode_info(&vbe_mode_info, vid_modes[i])) { |
| 182 | continue; |
| 183 | } |
| 184 | |
| 185 | // We only support RGB for now |
| 186 | if (vbe_mode_info.memory_model != 0x06) |
| 187 | continue; |
| 188 | // We only support linear modes |
| 189 | if (!(vbe_mode_info.mode_attributes & (1 << 7))) |
| 190 | continue; |
| 191 | |
| 192 | uint16_t pitch = (vbe_info.version_maj < 3) |
| 193 | ? vbe_mode_info.bytes_per_scanline |
| 194 | : vbe_mode_info.lin_bytes_per_scanline; |
| 195 | uint16_t bytes_per_pixel = vbe_mode_info.bpp / 8; |
| 196 | if (bytes_per_pixel == 0 |
| 197 | || pitch % bytes_per_pixel != 0 |
| 198 | || pitch < (uint32_t)vbe_mode_info.res_x * bytes_per_pixel) |
| 199 | continue; |
| 200 | |
| 201 | ret[j].memory_model = vbe_mode_info.memory_model; |
| 202 | |
| 203 | ret[j].framebuffer_width = vbe_mode_info.res_x; |
| 204 | ret[j].framebuffer_height = vbe_mode_info.res_y; |
| 205 | ret[j].framebuffer_bpp = vbe_mode_info.bpp; |
| 206 | |
| 207 | if (vbe_info.version_maj < 3) { |
| 208 | ret[j].framebuffer_pitch = vbe_mode_info.bytes_per_scanline; |
| 209 | ret[j].red_mask_size = vbe_mode_info.red_mask_size; |
| 210 | ret[j].red_mask_shift = vbe_mode_info.red_mask_shift; |
| 211 | ret[j].green_mask_size = vbe_mode_info.green_mask_size; |
| 212 | ret[j].green_mask_shift = vbe_mode_info.green_mask_shift; |
| 213 | ret[j].blue_mask_size = vbe_mode_info.blue_mask_size; |
| 214 | ret[j].blue_mask_shift = vbe_mode_info.blue_mask_shift; |
| 215 | } else { |
| 216 | ret[j].framebuffer_pitch = vbe_mode_info.lin_bytes_per_scanline; |
| 217 | ret[j].red_mask_size = vbe_mode_info.lin_red_mask_size; |
| 218 | ret[j].red_mask_shift = vbe_mode_info.lin_red_mask_shift; |
| 219 | ret[j].green_mask_size = vbe_mode_info.lin_green_mask_size; |
| 220 | ret[j].green_mask_shift = vbe_mode_info.lin_green_mask_shift; |
| 221 | ret[j].blue_mask_size = vbe_mode_info.lin_blue_mask_size; |
| 222 | ret[j].blue_mask_shift = vbe_mode_info.lin_blue_mask_shift; |
| 223 | } |
| 224 | |
| 225 | j++; |
| 226 | } |
| 227 | |
| 228 | *count = modes_count; |
| 229 | |
| 230 | return ret; |
| 231 | } |
| 232 | |
| 233 | bool init_vbe(struct fb_info *ret, |
| 234 | uint16_t target_width, uint16_t target_height, uint16_t target_bpp) { |
| 235 | printv("vbe: Initialising...\n"); |
| 236 | |
| 237 | size_t current_fallback = 0; |
| 238 | |
| 239 | struct vbe_info_struct vbe_info; |
| 240 | if (!get_vbe_info(&vbe_info)) { |
| 241 | return false; |
| 242 | } |
| 243 | |
| 244 | printv("vbe: Version: %u.%u\n", vbe_info.version_maj, vbe_info.version_min); |
| 245 | printv("vbe: OEM: %s\n", (char *)rm_desegment(vbe_info.oem_seg, vbe_info.oem_off)); |
| 246 | printv("vbe: Graphics vendor: %s\n", (char *)rm_desegment(vbe_info.vendor_seg, vbe_info.vendor_off)); |
| 247 | printv("vbe: Product name: %s\n", (char *)rm_desegment(vbe_info.prod_name_seg, vbe_info.prod_name_off)); |
| 248 | printv("vbe: Product revision: %s\n", (char *)rm_desegment(vbe_info.prod_rev_seg, vbe_info.prod_rev_off)); |
| 249 | |
| 250 | uint16_t *vid_modes = (uint16_t *)rm_desegment(vbe_info.vid_modes_seg, |
| 251 | vbe_info.vid_modes_off); |
| 252 | |
| 253 | struct resolution fallback_resolutions[] = { |
| 254 | { 1024, 768, 32 }, |
| 255 | { 800, 600, 32 }, |
| 256 | { 640, 480, 32 }, |
| 257 | { 1024, 768, 24 }, |
| 258 | { 800, 600, 24 }, |
| 259 | { 640, 480, 24 }, |
| 260 | { 1024, 768, 16 }, |
| 261 | { 800, 600, 16 }, |
| 262 | { 640, 480, 16 } |
| 263 | }; |
| 264 | |
| 265 | if (!target_width || !target_height || !target_bpp) { |
| 266 | struct edid_info_struct *edid_info = get_edid_info(); |
| 267 | if (edid_info != NULL) { |
| 268 | int edid_width = (int)edid_info->det_timing_desc1[2]; |
| 269 | edid_width += ((int)edid_info->det_timing_desc1[4] & 0xf0) << 4; |
| 270 | int edid_height = (int)edid_info->det_timing_desc1[5]; |
| 271 | edid_height += ((int)edid_info->det_timing_desc1[7] & 0xf0) << 4; |
| 272 | if (edid_width && edid_height) { |
| 273 | target_width = edid_width; |
| 274 | target_height = edid_height; |
| 275 | target_bpp = 32; |
| 276 | printv("vbe: EDID detected screen resolution of %ux%u\n", |
| 277 | target_width, target_height); |
| 278 | goto retry; |
| 279 | } |
| 280 | } |
| 281 | goto fallback; |
| 282 | } else { |
| 283 | printv("vbe: Requested resolution of %ux%ux%u\n", |
| 284 | target_width, target_height, target_bpp); |
| 285 | } |
| 286 | |
| 287 | retry: |
| 288 | for (size_t i = 0; i < VBE_MAX_MODES && vid_modes[i] != 0xffff; i++) { |
| 289 | struct vbe_mode_info_struct vbe_mode_info; |
| 290 | if (!get_vbe_mode_info(&vbe_mode_info, vid_modes[i])) { |
| 291 | continue; |
| 292 | } |
| 293 | if (vbe_mode_info.res_x == target_width |
| 294 | && vbe_mode_info.res_y == target_height |
| 295 | && vbe_mode_info.bpp == target_bpp) { |
| 296 | // We only support RGB for now |
| 297 | if (vbe_mode_info.memory_model != 0x06) |
| 298 | continue; |
| 299 | // We only support linear modes |
| 300 | if (!(vbe_mode_info.mode_attributes & (1 << 7))) |
| 301 | continue; |
| 302 | printv("vbe: Found matching mode %x, attempting to set...\n", vid_modes[i]); |
| 303 | if (vid_modes[i] == current_video_mode) { |
| 304 | printv("vbe: Mode was already set, perfect!\n"); |
| 305 | } else if (!set_vbe_mode(vid_modes[i])) { |
| 306 | current_video_mode = -1; |
| 307 | printv("vbe: Failed to set video mode %x, moving on...\n", vid_modes[i]); |
| 308 | continue; |
| 309 | } |
| 310 | current_video_mode = vid_modes[i]; |
| 311 | |
| 312 | printv("vbe: Framebuffer address: %x\n", vbe_mode_info.framebuffer_addr); |
| 313 | ret->memory_model = vbe_mode_info.memory_model; |
| 314 | ret->framebuffer_addr = vbe_mode_info.framebuffer_addr; |
| 315 | ret->framebuffer_width = vbe_mode_info.res_x; |
| 316 | ret->framebuffer_height = vbe_mode_info.res_y; |
| 317 | ret->framebuffer_bpp = vbe_mode_info.bpp; |
| 318 | if (vbe_info.version_maj < 3) { |
| 319 | ret->framebuffer_pitch = vbe_mode_info.bytes_per_scanline; |
| 320 | ret->red_mask_size = vbe_mode_info.red_mask_size; |
| 321 | ret->red_mask_shift = vbe_mode_info.red_mask_shift; |
| 322 | ret->green_mask_size = vbe_mode_info.green_mask_size; |
| 323 | ret->green_mask_shift = vbe_mode_info.green_mask_shift; |
| 324 | ret->blue_mask_size = vbe_mode_info.blue_mask_size; |
| 325 | ret->blue_mask_shift = vbe_mode_info.blue_mask_shift; |
| 326 | } else { |
| 327 | ret->framebuffer_pitch = vbe_mode_info.lin_bytes_per_scanline; |
| 328 | ret->red_mask_size = vbe_mode_info.lin_red_mask_size; |
| 329 | ret->red_mask_shift = vbe_mode_info.lin_red_mask_shift; |
| 330 | ret->green_mask_size = vbe_mode_info.lin_green_mask_size; |
| 331 | ret->green_mask_shift = vbe_mode_info.lin_green_mask_shift; |
| 332 | ret->blue_mask_size = vbe_mode_info.lin_blue_mask_size; |
| 333 | ret->blue_mask_shift = vbe_mode_info.lin_blue_mask_shift; |
| 334 | } |
| 335 | |
| 336 | uint16_t bytes_per_pixel = ret->framebuffer_bpp / 8; |
| 337 | if (bytes_per_pixel == 0 |
| 338 | || ret->framebuffer_pitch % bytes_per_pixel != 0 |
| 339 | || ret->framebuffer_pitch < (uint32_t)ret->framebuffer_width * bytes_per_pixel) { |
| 340 | printv("vbe: Mode %x has invalid pitch %u (width=%u, bpp=%u), skipping.\n", |
| 341 | vid_modes[i], (uint32_t)ret->framebuffer_pitch, |
| 342 | (uint32_t)ret->framebuffer_width, (uint32_t)ret->framebuffer_bpp); |
| 343 | continue; |
| 344 | } |
| 345 | |
| 346 | return true; |
| 347 | } |
| 348 | } |
| 349 | |
| 350 | fallback: |
| 351 | if (current_fallback < SIZEOF_ARRAY(fallback_resolutions)) { |
| 352 | target_width = fallback_resolutions[current_fallback].width; |
| 353 | target_height = fallback_resolutions[current_fallback].height; |
| 354 | target_bpp = fallback_resolutions[current_fallback].bpp; |
| 355 | current_fallback++; |
| 356 | goto retry; |
| 357 | } |
| 358 | |
| 359 | return false; |
| 360 | } |
| 361 | |
| 362 | #endif |
